/* roulang page: index */
:root{
  --bg-primary:#0A1A2F;
  --bg-deep:#050D18;
  --bg-card:rgba(255,255,255,0.04);
  --border-card:rgba(255,255,255,0.08);
  --accent-cyan:#00D4FF;
  --accent-ocean:#00B4D8;
  --accent-orange:#FF7A00;
  --text-main:#E8F0F8;
  --text-secondary:#9AB3C8;
  --text-muted:#5A7388;
  --radius-lg:24px;
  --radius-md:16px;
  --radius-sm:8px;
  --shadow-card:0 8px 32px rgba(0,0,0,0.35);
  --glow-cyan:0 0 24px rgba(0,212,255,0.35);
  --font-main:system-ui,-apple-system,"PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  font-family:var(--font-main);
  background-color:var(--bg-deep);
  color:var(--text-main);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;display:block;}
a{text-decoration:none;color:inherit;}
button{font-family:inherit;border:none;background:none;cursor:pointer;}
input,select,textarea{font-family:inherit;}
.container{max-width:1280px;margin:0 auto;padding:0 24px;}
@media(max-width:768px){.container{padding:0 16px;}}

/* 顶部信息条 */
.topbar{
  height:40px;
  background:#060F1C;
  border-bottom:1px solid rgba(255,255,255,0.06);
  display:flex;
  align-items:center;
  font-size:12.5px;
  color:var(--text-secondary);
  width:100%;
  position:relative;
  z-index:120;
}
.topbar .container{
  display:flex;
  align-items:center;
  justify-content:space-between;
  width:100%;
}
.topbar-domain{display:flex;align-items:center;gap:10px;font-weight:500;letter-spacing:0.02em;}
.topbar-domain .dot{width:4px;height:4px;border-radius:50%;background:var(--accent-cyan);box-shadow:var(--glow-cyan);}
.topbar-slogan{color:var(--text-secondary);font-size:12.5px;letter-spacing:0.02em;white-space:nowrap;}
.topbar-slogan span{color:var(--accent-cyan);font-weight:600;}
.topbar-action{display:flex;align-items:center;gap:6px;color:var(--text-main);font-weight:500;font-size:12.5px;transition:color 0.3s ease;}
.topbar-action i{font-size:12px;transition:transform 0.3s ease;}
.topbar-action:hover{color:var(--accent-cyan);}
.topbar-action:hover i{transform:translateX(3px);}
@media(max-width:768px){.topbar-slogan{display:none;}}

/* 主导航 */
.main-header{
  position:sticky;top:0;z-index:100;
  background:rgba(5,13,24,0.72);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  border-bottom:1px solid rgba(255,255,255,0.06);
  height:72px;
  transition:box-shadow 0.3s ease;
}
.main-header.scrolled{box-shadow:0 4px 30px rgba(0,0,0,0.5);}
.main-header .container{
  display:flex;align-items:center;justify-content:space-between;height:72px;gap:20px;
}
.logo{display:flex;align-items:center;gap:12px;flex-shrink:0;}
.logo-icon{
  width:44px;height:44px;border-radius:12px;
  background:linear-gradient(135deg,#00D4FF 0%,#0088CC 100%);
  display:flex;align-items:center;justify-content:center;
  box-shadow:0 0 18px rgba(0,212,255,0.35);
  color:#fff;font-size:20px;
  flex-shrink:0;
}
.logo-text{font-size:21px;font-weight:700;letter-spacing:0.01em;color:#fff;white-space:nowrap;}
.logo-text small{font-size:12px;font-weight:500;color:var(--accent-cyan);margin-left:4px;letter-spacing:0.08em;}
.nav-links{display:flex;align-items:center;gap:4px;list-style:none;}
.nav-links a{
  display:flex;align-items:center;height:40px;padding:0 16px;border-radius:10px;
  font-size:15px;font-weight:500;color:var(--text-secondary);
  transition:all 0.25s ease;white-space:nowrap;
}
.nav-links a:hover{color:#fff;background:rgba(255,255,255,0.06);}
.nav-links a.active{color:var(--accent-cyan);background:rgba(0,212,255,0.1);}
.nav-cta{flex-shrink:0;}
.btn-nav{
  height:40px;padding:0 20px;border-radius:10px;
  background:linear-gradient(135deg,#00D4FF,#00B4D8);
  color:#06121e;font-weight:700;font-size:14px;
  display:inline-flex;align-items:center;gap:6px;
  box-shadow:0 0 16px rgba(0,212,255,0.28);
  transition:all 0.25s ease;white-space:nowrap;
}
.btn-nav:hover{
  transform:translateY(-2px);box-shadow:0 0 24px rgba(0,212,255,0.45);
  filter:brightness(1.1);
}
.btn-nav:active{transform:scale(0.98);}
.hamburger{display:none;width:44px;height:44px;border-radius:10px;align-items:center;justify-content:center;background:rgba(255,255,255,0.05);border:1px solid var(--border-card);color:#fff;font-size:20px;transition:background 0.3s ease;}
.hamburger:hover{background:rgba(255,255,255,0.1);}
@media(max-width:1024px){
  .nav-links{display:none;}
  .hamburger{display:flex;}
}
.mobile-menu{
  display:none;
  position:fixed;top:72px;left:0;right:0;z-index:99;
  background:rgba(5,13,24,0.98);
  backdrop-filter:blur(20px);
  border-bottom:1px solid rgba(255,255,255,0.08);
  padding:8px 16px 24px;
}
.mobile-menu.open{display:block;}
.mobile-menu a{
  display:block;padding:14px 16px;border-radius:12px;font-size:16px;font-weight:500;
  color:var(--text-secondary);transition:all 0.2s ease;border-bottom:1px solid rgba(255,255,255,0.04);
}
.mobile-menu a:last-child{border-bottom:none;}
.mobile-menu a:hover{color:#fff;background:rgba(255,255,255,0.05);}
.mobile-menu a.active{color:var(--accent-cyan);background:rgba(0,212,255,0.08);}
@media(min-width:1025px){.mobile-menu{display:none !important;}}

/* Hero */
.hero{
  position:relative;
  background:url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
  padding:120px 0 100px;
  overflow:hidden;
}
.hero::before{
  content:'';position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(5,13,24,0.35) 0%,rgba(5,13,24,0.88) 100%);
  z-index:1;
}
.hero::after{
  content:'';position:absolute;inset:0;z-index:0;opacity:0.12;
  background-image:linear-gradient(rgba(0,212,255,0.3) 1px,transparent 1px),linear-gradient(90deg,rgba(0,212,255,0.3) 1px,transparent 1px);
  background-size:60px 60px;
}
.hero .container{position:relative;z-index:3;}
.hero-inner{max-width:780px;}
.hero-badge{
  display:inline-flex;align-items:center;gap:8px;
  padding:8px 16px;border-radius:100px;
  background:rgba(0,212,255,0.1);
  border:1px solid rgba(0,212,255,0.25);
  color:var(--accent-cyan);font-size:13px;font-weight:600;
  margin-bottom:24px;letter-spacing:0.02em;
  backdrop-filter:blur(8px);
}
.hero-badge i{font-size:14px;}
.hero h1{
  font-size:48px;font-weight:700;line-height:1.2;letter-spacing:-0.01em;color:#fff;
  margin-bottom:20px;
}
.hero h1 .grad{
  background:linear-gradient(90deg,#00D4FF,#7CE4FF);
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;
  background-clip:text;
}
.hero-sub{
  font-size:18px;color:var(--text-secondary);line-height:1.8;
  max-width:640px;margin-bottom:36px;
}
.hero-sub strong{color:var(--text-main);font-weight:600;}
.hero-actions{display:flex;align-items:center;gap:16px;flex-wrap:wrap;margin-bottom:20px;}
.btn-primary{
  height:48px;padding:0 32px;border-radius:12px;
  background:linear-gradient(135deg,#00D4FF 0%,#00B4D8 100%);
  color:#06121e;font-size:16px;font-weight:700;
  display:inline-flex;align-items:center;gap:8px;
  box-shadow:0 0 30px rgba(0,212,255,0.35);
  transition:all 0.25s ease;
}
.btn-primary:hover{transform:translateY(-2px);filter:brightness(1.12);box-shadow:0 6px 40px rgba(0,212,255,0.5);}
.btn-primary:active{transform:scale(0.98);}
.btn-secondary{
  height:48px;padding:0 32px;border-radius:12px;
  background:transparent;border:1px solid rgba(255,255,255,0.4);
  color:#fff;font-size:16px;font-weight:500;
  display:inline-flex;align-items:center;gap:8px;
  transition:all 0.25s ease;
}
.btn-secondary:hover{background:rgba(255,255,255,0.08);border-color:rgba(255,255,255,0.7);transform:translateY(-2px);}
.btn-secondary:active{transform:scale(0.98);}
.hero-float{
  position:absolute;right:60px;bottom:110px;z-index:3;
}
.hero-float-card{
  background:rgba(10,26,47,0.45);
  backdrop-filter:blur(16px);
  border:1px solid rgba(255,255,255,0.12);
  border-radius:16px;
  padding:18px 22px;
  box-shadow:0 8px 40px rgba(0,0,0,0.4);
  width:200px;
}
.hero-float-card .num{font-size:36px;font-weight:700;color:#fff;line-height:1.1;letter-spacing:-0.02em;}
.hero-float-card .unit{font-size:14px;color:var(--accent-cyan);font-weight:600;margin-left:2px;}
.hero-float-card .label{font-size:12.5px;color:var(--text-muted);margin-top:4px;letter-spacing:0.04em;}
.hero-float-card.glow{box-shadow:0 0 30px rgba(0,212,255,0.15),0 8px 40px rgba(0,0,0,0.4);}
.hero-float-b{position:absolute;right:280px;bottom:170px;z-index:2;width:170px;animation:floatY 4s ease-in-out infinite;}
.hero-float-b .num{font-size:32px;color:var(--accent-orange);}
@keyframes floatY{0%,100%{transform:translateY(0)}50%{transform:translateY(-10px)}}
.hero-stats{
  display:flex;align-items:center;gap:0;
  margin-top:56px;margin-bottom:-20px;
  background:rgba(10,26,47,0.4);
  border:1px solid var(--border-card);
  border-radius:16px;
  backdrop-filter:blur(12px);
  padding:24px 40px;
  z-index:3;
  flex-wrap:wrap;
}
.hero-stats .divider{width:1px;height:48px;background:rgba(255,255,255,0.1);margin:0 32px;}
.hero-stats .stat{flex:1;min-width:140px;}
.hero-stats .stat .num{font-size:32px;font-weight:700;color:var(--accent-cyan);line-height:1.2;}
.hero-stats .stat .num small{font-size:16px;font-weight:600;color:var(--accent-cyan);margin-left:2px;}
.hero-stats .stat .label{font-size:13px;color:var(--text-secondary);margin-top:2px;}
.hero-stats .stat.orange .num{color:var(--accent-orange);}
.hero-stats .stat.orange .num small{color:var(--accent-orange);}
.hero-divider{
  height:1px;position:relative;z-index:3;
  background:linear-gradient(90deg,transparent,rgba(0,212,255,0.5),transparent);
  margin-top:48px;
}
@media(max-width:1024px){
  .hero{padding:90px 0 70px;}
  .hero h1{font-size:38px;}
  .hero-sub{font-size:16px;}
  .hero-float{display:none;}
  .hero-stats .divider{margin:0 18px;}
}
@media(max-width:768px){
  .hero{padding:70px 0 56px;}
  .hero h1{font-size:30px;}
  .hero-sub{font-size:15px;margin-bottom:28px;}
  .hero-actions .btn-primary,.hero-actions .btn-secondary{width:100%;justify-content:center;height:46px;}
  .hero-stats{padding:20px 20px;gap:16px;}
  .hero-stats .divider{display:none;}
  .hero-stats .stat{min-width:calc(50% - 8px);text-align:center;}
  .hero-stats .stat .num{font-size:26px;}
  .hero-divider{margin-top:32px;}
}

/* 板块通用 */
.section{padding:100px 0;}
.section-header{text-align:center;max-width:720px;margin:0 auto 56px;}
.section-header .tag{
  display:inline-block;padding:6px 14px;border-radius:100px;
  font-size:12.5px;font-weight:600;color:var(--accent-cyan);
  background:rgba(0,212,255,0.08);border:1px solid rgba(0,212,255,0.16);
  letter-spacing:0.06em;margin-bottom:16px;text-transform:uppercase;
}
.section-header h2{
  font-size:32px;font-weight:700;line-height:1.3;color:#fff;letter-spacing:-0.01em;margin-bottom:16px;
}
.section-header h2 .grad{
  background:linear-gradient(90deg,#00D4FF,#7CE4FF);
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;
}
.section-header p{font-size:16px;color:var(--text-secondary);line-height:1.8;}
@media(max-width:768px){
  .section{padding:64px 0;}
  .section-header h2{font-size:26px;}
}

/* 三步上手区 */
.steps-section .section-header p{max-width:560px;margin:0 auto;}
.steps-grid{
  display:grid;grid-template-columns:1fr 1fr 1fr;gap:24px;
  align-items:center;
  position:relative;
}
.step-card{
  position:relative;
  background:rgba(255,255,255,0.04);
  backdrop-filter:blur(20px);
  border:1px solid var(--border-card);
  border-radius:20px;
  padding:36px 32px;
  transition:all 0.3s ease;
  overflow:hidden;
}
.step-card.middle{
  transform:scale(1.05);
  background:rgba(0,212,255,0.06);
  border-color:rgba(0,212,255,0.25);
  box-shadow:0 0 40px rgba(0,212,255,0.08);
  padding:42px 32px;
  z-index:2;
}
.step-card:hover{
  border-color:rgba(0,212,255,0.4);
  transform:translateY(-4px);
  box-shadow:0 12px 44px rgba(0,0,0,0.4),0 0 30px rgba(0,212,255,0.06);
}
.step-card.middle:hover{transform:translateY(-4px) scale(1.05);}
.step-num{
  position:absolute;top:16px;right:24px;
  font-size:64px;font-weight:800;
  color:rgba(0,212,255,0.14);
  line-height:1;
  text-shadow:0 0 30px rgba(0,212,255,0.25);
  font-family:'SF Mono',ui-monospace,monospace;
}
.step-card.middle .step-num{color:rgba(0,212,255,0.28);}
.step-icon{
  width:56px;height:56px;border-radius:14px;
  background:linear-gradient(135deg,rgba(0,212,255,0.2),rgba(0,180,216,0.1));
  border:1px solid rgba(0,212,255,0.2);
  display:flex;align-items:center;justify-content:center;
  font-size:24px;color:var(--accent-cyan);
  margin-bottom:20px;
}
.step-card h3{font-size:20px;font-weight:600;color:#fff;margin-bottom:10px;}
.step-card p{font-size:14px;color:var(--text-secondary);line-height:1.7;}
.step-arrow{
  position:absolute;top:50%;right:-28px;transform:translateY(-50%);
  color:var(--accent-cyan);font-size:18px;z-index:3;opacity:0.5;
}
.step-arrow.dashed::before{content:'';position:absolute;width:44px;height:1px;border-top:1px dashed rgba(0,212,255,0.4);left:-28px;top:11px;}
@media(max-width:1024px){
  .steps-grid{grid-template-columns:1fr;max-width:560px;margin:0 auto;gap:20px;}
  .step-card.middle{transform:none;order:1;padding:36px 32px;}
  .step-card.middle:hover{transform:translateY(-4px);}
  .step-card{order:2;}
  .step-arrow{display:none;}
}

/* 案例证明区 */
.cases-section{
  background:linear-gradient(180deg,var(--bg-deep) 0%,#081224 50%,var(--bg-deep) 100%);
  position:relative;
  overflow:hidden;
}
.cases-section::before{
  content:'';position:absolute;top:0;left:50%;transform:translateX(-50%);
  width:600px;height:1px;background:linear-gradient(90deg,transparent,rgba(0,212,255,0.4),transparent);
}
.case-item{
  display:grid;grid-template-columns:1.1fr 1fr;gap:48px;align-items:center;
  margin-bottom:96px;
}
.case-item:last-child{margin-bottom:0;}
.case-item.reverse .case-media{order:2;}
.case-item.reverse .case-content{order:1;}
.case-media{
  position:relative;border-radius:16px;overflow:hidden;
  aspect-ratio:16/10;box-shadow:var(--shadow-card);
  border:1px solid var(--border-card);
}
.case-media img{
  width:100%;height:100%;object-fit:cover;
  transition:transform 0.4s ease;
}
.case-media:hover img{transform:scale(1.03);}
.case-media::after{
  content:'';position:absolute;inset:0;
  background:linear-gradient(0deg,rgba(5,13,24,0.3),transparent 40%);
}
.case-label{
  position:absolute;bottom:16px;left:16px;z-index:3;
  display:inline-flex;align-items:center;gap:6px;
  padding:6px 14px;border-radius:100px;
  background:rgba(5,13,24,0.65);
  backdrop-filter:blur(8px);
  border:1px solid rgba(255,255,255,0.15);
  font-size:12.5px;font-weight:600;color:#fff;
  letter-spacing:0.03em;
}
.case-content .case-tag{
  display:inline-flex;align-items:center;gap:6px;
  font-size:13px;font-weight:600;color:var(--accent-cyan);
  background:rgba(0,212,255,0.08);border:1px solid rgba(0,212,255,0.18);
  padding:5px 12px;border-radius:100px;margin-bottom:16px;
}
.case-content h3{font-size:24px;font-weight:700;color:#fff;margin-bottom:14px;line-height:1.4;}
.case-content p{font-size:15px;color:var(--text-secondary);line-height:1.8;margin-bottom:20px;}
.case-result{
  display:flex;align-items:baseline;gap:8px;
  padding:18px 24px;border-radius:14px;
  background:rgba(255,122,0,0.08);
  border:1px solid rgba(255,122,0,0.18);
  display:inline-flex;
}
.case-result .num{font-size:38px;font-weight:800;color:var(--accent-orange);line-height:1;}
.case-result .label{font-size:14px;color:var(--text-secondary);}
@media(max-width:1024px){
  .case-item,.case-item.reverse{grid-template-columns:1fr;gap:28px;margin-bottom:64px;}
  .case-item.reverse .case-media{order:1;}
  .case-item.reverse .case-content{order:2;}
}
@media(max-width:768px){
  .case-content h3{font-size:20px;}
  .case-result .num{font-size:30px;}
}

/* 资讯列表 */
.news-section{position:relative;}
.news-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;}
.news-card{
  display:flex;flex-direction:column;
  background:rgba(255,255,255,0.04);
  border:1px solid var(--border-card);
  border-radius:16px;
  overflow:hidden;
  transition:all 0.3s ease;
  height:100%;
}
.news-card:hover{
  border-color:rgba(0,212,255,0.35);
  transform:translateY(-4px);
  box-shadow:0 12px 36px rgba(0,0,0,0.35),0 0 20px rgba(0,212,255,0.05);
}
.news-media{
  position:relative;aspect-ratio:16/8;overflow:hidden;background:#081224;
}
.news-media img{width:100%;height:100%;object-fit:cover;transition:transform 0.4s ease;}
.news-card:hover .news-media img{transform:scale(1.05);}
.news-media .badge{
  position:absolute;top:14px;left:14px;z-index:2;
  padding:4px 12px;border-radius:100px;
  background:rgba(0,212,255,0.9);color:#06121e;
  font-size:12px;font-weight:700;letter-spacing:0.03em;
}
.news-body{padding:20px 22px 24px;display:flex;flex-direction:column;flex:1;}
.news-body h3{font-size:17px;font-weight:600;color:#fff;line-height:1.5;margin-bottom:10px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;transition:color 0.2s ease;}
.news-card:hover .news-body h3{color:var(--accent-cyan);}
.news-body p{
  font-size:13.5px;color:var(--text-secondary);line-height:1.7;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
  margin-bottom:14px;
}
.news-meta{display:flex;align-items:center;justify-content:space-between;margin-top:auto;padding-top:14px;border-top:1px solid rgba(255,255,255,0.06);}
.news-meta .time{font-size:12.5px;color:var(--text-muted);display:flex;align-items:center;gap:6px;}
.news-meta .cat{font-size:12px;font-weight:600;color:var(--accent-cyan);background:rgba(0,212,255,0.08);padding:3px 10px;border-radius:100px;letter-spacing:0.03em;}
.news-empty{
  grid-column:1/-1;
  padding:60px 30px;text-align:center;
  background:rgba(255,255,255,0.03);
  border:1px dashed var(--border-card);
  border-radius:16px;
  color:var(--text-muted);font-size:15px;
}
.btn-center{text-align:center;margin-top:40px;}
.btn-more{
  display:inline-flex;align-items:center;gap:8px;
  height:46px;padding:0 28px;border-radius:12px;
  border:1px solid rgba(255,255,255,0.25);
  color:#fff;font-size:14px;font-weight:600;
  transition:all 0.25s ease;
}
.btn-more:hover{border-color:var(--accent-cyan);color:var(--accent-cyan);background:rgba(0,212,255,0.06);}
@media(max-width:768px){
  .news-grid{grid-template-columns:1fr;}
}

/* FAQ */
.faq-section{
  background:linear-gradient(180deg,var(--bg-deep) 0%,#081224 50%,var(--bg-deep) 100%);
}
.faq-list{max-width:820px;margin:0 auto;}
.faq-item{
  background:rgba(255,255,255,0.04);
  backdrop-filter:blur(12px);
  border:1px solid var(--border-card);
  border-radius:14px;
  margin-bottom:14px;
  overflow:hidden;
  transition:border-color 0.3s ease;
}
.faq-item.open{border-color:rgba(0,212,255,0.3);}
.faq-question{
  display:flex;align-items:center;justify-content:space-between;
  padding:20px 24px;cursor:pointer;gap:16px;
  min-height:60px;
}
.faq-question .q-text{font-size:15.5px;font-weight:600;color:#fff;line-height:1.5;}
.faq-question .q-icon{
  width:32px;height:32px;border-radius:50%;
  background:rgba(0,212,255,0.1);
  border:1px solid rgba(0,212,255,0.2);
  display:flex;align-items:center;justify-content:center;
  font-size:16px;color:var(--accent-cyan);
  transition:transform 0.25s ease;
  flex-shrink:0;
}
.faq-item.open .q-icon{transform:rotate(45deg);background:rgba(0,212,255,0.2);}
.faq-answer{
  max-height:0;overflow:hidden;
  transition:max-height 0.3s ease;
}
.faq-item.open .faq-answer{max-height:200px;}
.faq-answer p{
  padding:0 24px 20px;
  color:var(--text-secondary);font-size:14.5px;line-height:1.8;
  border-top:1px solid rgba(255,255,255,0.05);
  padding-top:16px;
}
@media(max-width:768px){
  .faq-question{padding:16px 18px;}
  .faq-question .q-text{font-size:14px;}
}

/* CTA 表单区 */
.cta-section{position:relative;overflow:hidden;padding:100px 0;}
.cta-section::before{
  content:'';position:absolute;inset:0;
  background:url('/assets/images/backpic/back-2.webp') center/cover no-repeat;
  opacity:0.25;z-index:0;
}
.cta-section::after{
  content:'';position:absolute;top:0;left:50%;transform:translateX(-50%);
  width:600px;height:2px;background:linear-gradient(90deg,transparent,rgba(0,212,255,0.6),transparent);
  box-shadow:0 0 20px rgba(0,212,255,0.4);
}
.cta-wrap{position:relative;z-index:2;}
.cta-card{
  background:rgba(10,26,47,0.6);
  backdrop-filter:blur(20px);
  border:1px solid rgba(255,255,255,0.1);
  border-radius:24px;
  padding:56px;
  max-width:980px;margin:0 auto;
  position:relative;
}
.cta-card::before{
  content:'';position:absolute;top:50%;right:-40px;width:80px;height:80px;border-radius:50%;
  background:radial-gradient(circle,rgba(0,212,255,0.2),transparent 70%);
  pointer-events:none;
}
.cta-title{text-align:center;font-size:30px;font-weight:700;color:#fff;line-height:1.4;margin-bottom:12px;}
.cta-title .grad{
  background:linear-gradient(90deg,#00D4FF,#7CE4FF);
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;
}
.cta-sub{text-align:center;font-size:15px;color:var(--text-secondary);margin-bottom:40px;}
.cta-form{display:grid;grid-template-columns:1fr 1fr;gap:20px;}
.cta-form .field-full{grid-column:1/-1;}
.form-label{font-size:12.5px;font-weight:600;color:var(--text-secondary);margin-bottom:8px;display:block;letter-spacing:0.03em;}
.form-input{
  width:100%;height:48px;padding:0 16px;
  background:rgba(255,255,255,0.06);
  border:1px solid rgba(255,255,255,0.12);
  border-radius:10px;
  color:#fff;font-size:14.5px;
  transition:all 0.25s ease;
  outline:none;
}
.form-input::placeholder{color:var(--text-muted);}
.form-input:focus{
  border-color:var(--accent-cyan);
  box-shadow:0 0 0 3px rgba(0,212,255,0.15),0 0 16px rgba(0,212,255,0.1);
  background:rgba(255,255,255,0.09);
}
.form-select{
  width:100%;height:48px;padding:0 16px;
  background:rgba(255,255,255,0.06);
  border:1px solid rgba(255,255,255,0.12);
  border-radius:10px;color:#fff;font-size:14.5px;
  transition:all 0.25s ease;outline:none;
  appearance:none;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24' fill='none' stroke='%239AB3C8' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat:no-repeat;background-position:right 14px center;
}
.form-select:focus{border-color:var(--accent-cyan);box-shadow:0 0 0 3px rgba(0,212,255,0.15);}
.form-select option{
  background:#0A1A2F;color:#fff;padding:8px;
}
.btn-submit{
  grid-column:1/-1;
  height:52px;border-radius:12px;
  background:linear-gradient(135deg,#00D4FF,#00B4D8);
  color:#06121e;font-size:16px;font-weight:700;
  display:flex;align-items:center;justify-content:center;gap:8px;
  box-shadow:0 0 24px rgba(0,212,255,0.3);
  transition:all 0.25s ease;width:100%;
}
.btn-submit:hover{transform:translateY(-2px);filter:brightness(1.12);box-shadow:0 6px 36px rgba(0,212,255,0.45);}
.btn-submit:active{transform:scale(0.98);}
.form-tip{
  grid-column:1/-1;text-align:center;
  font-size:12.5px;color:var(--text-muted);
  display:flex;align-items:center;justify-content:center;gap:6px;margin-top:4px;
}
.form-tip i{color:var(--accent-cyan);font-size:13px;}
@media(max-width:768px){
  .cta-card{padding:36px 24px;}
  .cta-title{font-size:24px;}
  .cta-form{grid-template-columns:1fr;}
  .cta-form .field-full{grid-column:auto;}
  .btn-submit{grid-column:auto;}
}

/* 页脚 */
.site-footer{background:#060F1C;border-top:1px solid rgba(255,255,255,0.05);padding:64px 0 0;position:relative;}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:48px;padding-bottom:48px;border-bottom:1px solid rgba(255,255,255,0.06);}
.footer-brand .logo{margin-bottom:16px;}
.footer-brand p{font-size:14px;color:var(--text-secondary);line-height:1.8;max-width:320px;}
.footer-col h4{
  font-size:15px;font-weight:600;color:#fff;margin-bottom:18px;
  letter-spacing:0.03em;
}
.footer-col ul{list-style:none;}
.footer-col li{margin-bottom:10px;}
.footer-col a{
  font-size:14px;color:var(--text-secondary);
  transition:color 0.2s ease,transform 0.2s ease;
  display:inline-flex;align-items:center;gap:6px;
}
.footer-col a i{font-size:11px;opacity:0;transform:translateX(-4px);transition:all 0.2s ease;}
.footer-col a:hover{color:var(--accent-cyan);transform:translateX(4px);}
.footer-col a:hover i{opacity:1;transform:translateX(0);}
.footer-contact li{display:flex;align-items:flex-start;gap:10px;font-size:14px;color:var(--text-secondary);}
.footer-contact li i{color:var(--accent-cyan);margin-top:3px;width:16px;text-align:center;flex-shrink:0;}
.footer-bottom{
  padding:22px 0;
  display:flex;align-items:center;justify-content:space-between;
  flex-wrap:wrap;gap:12px;
  font-size:13px;color:var(--text-muted);
}
.footer-bottom .copyright{display:flex;align-items:center;gap:8px;}
.footer-bottom .copyright i{color:var(--accent-cyan);}
@media(max-width:1024px){
  .footer-grid{grid-template-columns:1fr 1fr;gap:36px;}
}
@media(max-width:768px){
  .footer-grid{grid-template-columns:1fr;gap:28px;padding-bottom:32px;}
  .footer-bottom{justify-content:center;text-align:center;}
}

/* 通用工具 */
.text-orange{color:var(--accent-orange);}
.text-cyan{color:var(--accent-cyan);}
.section-sub{font-size:15px;color:var(--text-secondary);line-height:1.8;max-width:560px;margin:0 auto;}
@media(max-width:768px){
  .section-sub{font-size:14px;}
}

/* roulang page: category1 */
:root {
      --bg-navy: #0A1A2F;
      --bg-deep: #050D18;
      --primary: #00D4FF;
      --primary-2: #00B4D8;
      --accent: #FF7A00;
      --text-main: #E8F0F8;
      --text-sub: #9AB3C8;
      --text-muted: #5A7388;
      --card-bg: rgba(255, 255, 255, 0.04);
      --card-border: rgba(255, 255, 255, 0.08);
      --glow: 0 0 24px rgba(0, 212, 255, 0.35);
      --radius-lg: 24px;
      --radius-md: 16px;
      --radius-sm: 8px;
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.35), 0 0 0 1px rgba(255, 255, 255, 0.05);
      --font-main: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-main);
      background-color: var(--bg-navy);
      color: var(--text-main);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    img {
      display: block;
      max-width: 100%;
    }

    a {
      color: var(--primary);
      text-decoration: none;
      transition: color .3s ease;
    }

    a:hover {
      color: #fff;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    @media (max-width: 767px) {
      .container {
        padding: 0 16px;
      }
    }

    /* Topbar */
    .topbar {
      height: 40px;
      background: #060E18;
      border-bottom: 1px solid rgba(255, 255, 255, 0.06);
      display: flex;
      align-items: center;
      font-size: 13px;
      color: var(--text-sub);
    }

    .topbar a {
      color: var(--text-sub);
      font-weight: 500;
    }

    .topbar a:hover {
      color: var(--primary);
    }

    .topbar .separator {
      margin: 0 12px;
      color: rgba(255, 255, 255, 0.2);
    }

    .topbar-cta {
      display: inline-flex;
      align-items: center;
      gap: 4px;
      font-weight: 600;
      transition: all .3s ease;
    }

    .topbar-cta i {
      font-size: 11px;
      transition: transform .3s ease;
    }

    .topbar-cta:hover i {
      transform: translateX(3px);
    }

    @media (max-width: 767px) {
      .topbar .topbar-hint {
        display: none;
      }
    }

    /* Navbar */
    .site-nav {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(10, 26, 47, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    }

    .nav-inner {
      height: 72px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 24px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      flex-shrink: 0;
    }

    .logo-icon {
      width: 38px;
      height: 38px;
      border-radius: 10px;
      background: linear-gradient(135deg, var(--primary), var(--primary-2));
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      font-size: 18px;
      box-shadow: var(--glow);
    }

    .logo-text {
      font-size: 20px;
      font-weight: 700;
      color: var(--text-main);
      letter-spacing: -0.01em;
      white-space: nowrap;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
      list-style: none;
    }

    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-sub);
      position: relative;
      padding: 6px 2px;
      transition: color .3s;
    }

    .nav-links a:hover {
      color: var(--text-main);
    }

    .nav-links a.active {
      color: var(--primary);
    }

    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 2px;
      border-radius: 2px;
      background: var(--primary);
      box-shadow: var(--glow);
    }

    .nav-cta {
      display: inline-flex;
      align-items: center;
      height: 40px;
      padding: 0 20px;
      border-radius: 10px;
      background: linear-gradient(135deg, var(--primary), var(--primary-2));
      color: #fff;
      font-size: 14px;
      font-weight: 600;
      box-shadow: 0 0 18px rgba(0, 212, 255, 0.3);
      transition: all .3s ease;
      white-space: nowrap;
    }

    .nav-cta:hover {
      background: linear-gradient(135deg, #22dcff, #00c8e6);
      transform: translateY(-2px);
      box-shadow: 0 4px 24px rgba(0, 212, 255, 0.45);
      color: #fff;
    }

    .nav-cta:active {
      transform: scale(0.98);
    }

    .mobile-toggle {
      display: none;
      width: 40px;
      height: 40px;
      border: 1px solid var(--card-border);
      border-radius: 10px;
      background: rgba(255, 255, 255, 0.04);
      color: var(--text-main);
      align-items: center;
      justify-content: center;
      cursor: pointer;
      font-size: 18px;
    }

    .category-label {
      display: inline-block;
      font-size: 12px;
      font-weight: 600;
      letter-spacing: 0.04em;
      padding: 3px 10px;
      border-radius: 20px;
      background: rgba(0, 212, 255, 0.12);
      color: var(--primary);
      border: 1px solid rgba(0, 212, 255, 0.2);
      white-space: nowrap;
    }

    /* Mobile nav */
    @media (max-width: 1023px) {
      .nav-links {
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        background: rgba(10, 26, 47, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        align-items: flex-start;
        padding: 24px;
        gap: 18px;
        border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        display: none;
      }

      .nav-links.open {
        display: flex;
      }

      .nav-links a {
        font-size: 16px;
        width: 100%;
      }

      .nav-cta {
        display: none;
      }

      .mobile-toggle {
        display: flex;
      }
    }

    /* Buttons */
    .btn-primary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      height: 48px;
      padding: 0 28px;
      border-radius: 10px;
      background: linear-gradient(135deg, var(--primary), var(--primary-2));
      color: #fff;
      font-size: 15px;
      font-weight: 600;
      border: none;
      cursor: pointer;
      box-shadow: 0 0 24px rgba(0, 212, 255, 0.3);
      transition: all .3s ease;
    }

    .btn-primary:hover {
      background: linear-gradient(135deg, #22dcff, #00c8e6);
      transform: translateY(-2px);
      box-shadow: 0 6px 28px rgba(0, 212, 255, 0.4);
      color: #fff;
    }

    .btn-primary:active {
      transform: scale(0.98);
    }

    .btn-outline {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      height: 48px;
      padding: 0 28px;
      border-radius: 10px;
      background: transparent;
      border: 1px solid rgba(255, 255, 255, 0.3);
      color: var(--text-main);
      font-size: 15px;
      font-weight: 500;
      cursor: pointer;
      transition: all .3s ease;
    }

    .btn-outline:hover {
      border-color: rgba(255, 255, 255, 0.7);
      background: rgba(255, 255, 255, 0.05);
      color: #fff;
    }

    .btn-outline:active {
      transform: scale(0.98);
    }

    /* Section spacing */
    .section {
      padding: 100px 0;
    }

    @media (max-width: 767px) {
      .section {
        padding: 64px 0;
      }
    }

    .section-head {
      margin-bottom: 48px;
    }

    .section-tag {
      font-size: 13px;
      font-weight: 600;
      letter-spacing: 0.06em;
      text-transform: uppercase;
      color: var(--primary);
      margin-bottom: 12px;
      display: inline-block;
    }

    .section-title {
      font-size: 30px;
      font-weight: 700;
      line-height: 1.3;
      letter-spacing: -0.01em;
      color: var(--text-main);
    }

    @media (max-width: 767px) {
      .section-title {
        font-size: 24px;
      }
    }

    .section-desc {
      font-size: 15px;
      color: var(--text-sub);
      margin-top: 12px;
      max-width: 640px;
    }

    /* Cards */
    .glass-card {
      background: var(--card-bg);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-card);
      padding: 32px;
      transition: border-color .3s ease, transform .3s ease;
    }

    .glass-card:hover {
      border-color: rgba(0, 212, 255, 0.4);
      transform: translateY(-4px);
    }

    .stat-card {
      background: rgba(255, 255, 255, 0.04);
      border: 1px solid var(--card-border);
      border-radius: 16px;
      padding: 24px 28px;
      text-align: center;
      backdrop-filter: blur(12px);
    }

    .stat-number {
      font-size: 40px;
      font-weight: 700;
      line-height: 1.2;
      background: linear-gradient(135deg, var(--primary), var(--primary-2));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      font-family: 'SF Mono', SFMono-Regular, Consolas, monospace;
    }

    .stat-label {
      font-size: 13px;
      color: var(--text-sub);
      margin-top: 6px;
      letter-spacing: 0.03em;
    }

    /* FAQ */
    .faq-item {
      background: var(--card-bg);
      border: 1px solid var(--card-border);
      border-radius: 12px;
      margin-bottom: 12px;
      overflow: hidden;
      transition: border-color .3s;
    }

    .faq-item.active {
      border-color: rgba(0, 212, 255, 0.3);
    }

    .faq-q {
      width: 100%;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      padding: 20px 24px;
      background: transparent;
      border: none;
      color: var(--text-main);
      font-size: 15px;
      font-weight: 500;
      cursor: pointer;
      text-align: left;
      font-family: var(--font-main);
    }

    .faq-q .faq-icon {
      width: 28px;
      height: 28px;
      border-radius: 50%;
      border: 1px solid rgba(255, 255, 255, 0.15);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 14px;
      color: var(--primary);
      transition: transform .3s ease;
      flex-shrink: 0;
    }

    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    .faq-a {
      max-height: 0;
      overflow: hidden;
      transition: max-height .3s ease;
      padding: 0 24px;
    }

    .faq-item.active .faq-a {
      max-height: 300px;
      padding-bottom: 20px;
    }

    .faq-a p {
      font-size: 14px;
      color: var(--text-sub);
      line-height: 1.8;
    }

    /* CTA */
    .cta-section {
      background: linear-gradient(135deg, rgba(5, 13, 24, 0.95), rgba(10, 26, 47, 0.9)), url('/assets/images/backpic/back-3.webp') center/cover no-repeat;
      border-top: 1px solid rgba(0, 212, 255, 0.2);
      border-bottom: 1px solid rgba(0, 212, 255, 0.2);
      position: relative;
    }

    .cta-section::before {
      content: '';
      position: absolute;
      top: 0;
      left: 50%;
      transform: translateX(-50%);
      width: 80%;
      height: 1px;
      background: linear-gradient(90deg, transparent, var(--primary), transparent);
    }

    /* Form */
    .form-input,
    .form-select {
      width: 100%;
      height: 46px;
      border-radius: 10px;
      background: rgba(255, 255, 255, 0.06);
      border: 1px solid rgba(255, 255, 255, 0.1);
      color: var(--text-main);
      padding: 0 16px;
      font-size: 14px;
      outline: none;
      transition: border-color .3s, box-shadow .3s;
      font-family: var(--font-main);
    }

    .form-input::placeholder {
      color: var(--text-muted);
    }

    .form-input:focus,
    .form-select:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.15);
    }

    .form-select option {
      background: var(--bg-navy);
      color: var(--text-main);
    }

    /* Footer */
    .site-footer {
      background: #050D18;
      border-top: 1px solid rgba(255, 255, 255, 0.06);
      padding: 64px 0 0;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.4fr 1fr 1fr 1fr;
      gap: 48px;
      padding-bottom: 40px;
    }

    .footer-brand p {
      font-size: 14px;
      color: var(--text-sub);
      margin-top: 16px;
      line-height: 1.8;
      max-width: 280px;
    }

    .footer-col h4 {
      font-size: 15px;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 18px;
    }

    .footer-col ul {
      list-style: none;
    }

    .footer-col li {
      margin-bottom: 10px;
    }

    .footer-col li a {
      font-size: 14px;
      color: var(--text-sub);
      display: inline-flex;
      align-items: center;
      gap: 6px;
      transition: color .3s;
    }

    .footer-col li a:hover {
      color: var(--primary);
    }

    .footer-col li a i {
      font-size: 10px;
      margin-left: 4px;
    }

    .footer-contact li {
      font-size: 14px;
      color: var(--text-sub);
      display: flex;
      align-items: flex-start;
      gap: 10px;
    }

    .footer-contact li i {
      color: var(--primary);
      margin-top: 4px;
      width: 16px;
      text-align: center;
    }

    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.06);
      padding: 24px 0;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      flex-wrap: wrap;
      font-size: 13px;
      color: var(--text-muted);
    }

    .footer-bottom span:last-child {
      color: var(--text-muted);
    }

    @media (max-width: 1023px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 32px;
      }
    }

    @media (max-width: 767px) {
      .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
      }

      .footer-bottom {
        flex-direction: column;
        text-align: center;
      }
    }

    /* Banner */
    .category-banner {
      position: relative;
      min-height: 460px;
      display: flex;
      align-items: center;
      padding: 100px 0;
      background: linear-gradient(180deg, rgba(5, 13, 24, 0.3) 0%, rgba(5, 13, 24, 0.92) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-bottom: 1px solid rgba(0, 212, 255, 0.15);
    }

    .category-banner::after {
      content: '';
      position: absolute;
      bottom: -1px;
      left: 0;
      right: 0;
      height: 1px;
      background: linear-gradient(90deg, transparent, var(--primary), transparent);
    }

    .banner-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 6px 14px;
      border-radius: 20px;
      background: rgba(0, 212, 255, 0.1);
      border: 1px solid rgba(0, 212, 255, 0.25);
      color: var(--primary);
      font-size: 13px;
      font-weight: 500;
      margin-bottom: 20px;
    }

    .banner-title {
      font-size: 44px;
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.01em;
      color: var(--text-main);
      margin-bottom: 16px;
    }

    .banner-subtitle {
      font-size: 16px;
      color: var(--text-sub);
      line-height: 1.8;
      max-width: 560px;
      margin-bottom: 32px;
    }

    @media (max-width: 767px) {
      .category-banner {
        min-height: 380px;
        padding: 70px 0;
      }

      .banner-title {
        font-size: 30px;
      }

      .banner-subtitle {
        font-size: 15px;
      }
    }

    /* Split sections */
    .split-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }

    .split-image {
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      position: relative;
    }

    .split-image img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      aspect-ratio: 16/11;
      transition: transform .4s ease;
    }

    .split-image:hover img {
      transform: scale(1.03);
    }

    .split-content h3 {
      font-size: 26px;
      font-weight: 700;
      line-height: 1.3;
      margin-bottom: 16px;
      color: var(--text-main);
    }

    .split-content p {
      font-size: 15px;
      color: var(--text-sub);
      line-height: 1.8;
      margin-bottom: 16px;
    }

    .check-list {
      list-style: none;
      margin-top: 20px;
    }

    .check-list li {
      display: flex;
      align-items: flex-start;
      gap: 12px;
      font-size: 15px;
      color: var(--text-main);
      margin-bottom: 14px;
      line-height: 1.6;
    }

    .check-list li i {
      color: var(--primary);
      margin-top: 3px;
      width: 18px;
      font-size: 14px;
    }

    @media (max-width: 767px) {
      .split-row {
        grid-template-columns: 1fr;
        gap: 40px;
      }

      .split-content h3 {
        font-size: 22px;
      }

      .split-row:nth-of-type(even) .split-image {
        order: -1;
      }
    }

    /* Steps */
    .step-card {
      background: var(--card-bg);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-md);
      padding: 36px 32px;
      position: relative;
      backdrop-filter: blur(12px);
      transition: transform .3s, border-color .3s;
    }

    .step-card:hover {
      transform: translateY(-6px);
      border-color: rgba(0, 212, 255, 0.4);
    }

    .step-number {
      font-size: 52px;
      font-weight: 800;
      line-height: 1;
      background: linear-gradient(135deg, var(--primary), var(--primary-2));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 20px;
      display: block;
      text-shadow: 0 0 40px rgba(0, 212, 255, 0.3);
    }

    .step-card h4 {
      font-size: 18px;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 12px;
    }

    .step-card p {
      font-size: 14px;
      color: var(--text-sub);
      line-height: 1.7;
    }

    /* Accordion demo via JS */
    .step-arrow {
      display: none;
    }

    @media (min-width: 768px) {
      .step-arrow {
        display: flex;
        align-items: center;
        justify-content: center;
        color: var(--primary);
        font-size: 20px;
        flex-shrink: 0;
      }
    }

    /* custom utility */
    .text-gradient {
      background: linear-gradient(135deg, var(--primary), var(--primary-2));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .divider-glow {
      height: 1px;
      background: linear-gradient(90deg, transparent, rgba(0, 212, 255, 0.4), transparent);
      border: none;
      margin: 0;
    }

    .card-icon {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      background: rgba(0, 212, 255, 0.1);
      border: 1px solid rgba(0, 212, 255, 0.2);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      color: var(--primary);
      margin-bottom: 16px;
    }

    .mini-card {
      background: var(--card-bg);
      border: 1px solid var(--card-border);
      border-radius: 16px;
      padding: 24px;
      backdrop-filter: blur(12px);
      transition: all .3s ease;
    }

    .mini-card:hover {
      border-color: rgba(0, 212, 255, 0.3);
    }

    .mini-card h4 {
      font-size: 16px;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 8px;
    }

    .mini-card p {
      font-size: 13px;
      color: var(--text-sub);
      line-height: 1.6;
    }

/* roulang page: article */
/* ===== 设计变量 ===== */
:root {
  --bg-deep: #050d18;
  --bg-primary: #0a1a2f;
  --bg-card: rgba(255, 255, 255, 0.04);
  --bg-card-hover: rgba(255, 255, 255, 0.08);
  --border-light: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(0, 212, 255, 0.4);
  --accent: #00d4ff;
  --accent-2: #00b4d8;
  --accent-orange: #ff7a00;
  --accent-gold: #ffb800;
  --text-primary: #e8f0f8;
  --text-secondary: #9ab3c8;
  --text-muted: #5a7388;
  --glow: 0 0 24px rgba(0, 212, 255, 0.35);
  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.35);
  --radius-lg: 24px;
  --radius-md: 16px;
  --radius-sm: 8px;
  --container: 1280px;
}

/* ===== 基础 Reset ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: var(--accent); text-decoration: none; transition: color .25s ease; }
a:hover { color: #fff; }
img { max-width: 100%; display: block; }
button, input, select, textarea { font-family: inherit; }

/* ===== 容器 ===== */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== 顶部信息条 ===== */
.top-bar {
  background: #040d18;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  height: 40px;
  display: flex;
  align-items: center;
  font-size: 13px;
  color: var(--text-muted);
}
.top-bar-inner {
  display: flex;
  align-items: center;
  gap: 16px;
  width: 100%;
}
.top-domain { font-weight: 600; color: var(--text-secondary); letter-spacing: 0.02em; }
.top-divider { width: 1px; height: 14px; background: rgba(255, 255, 255, 0.1); }
.top-tip { color: var(--text-muted); }
.top-action {
  margin-left: auto;
  color: var(--accent);
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  transition: all .3s ease;
}
.top-action:hover { color: #fff; }
.top-action i { transition: transform .3s ease; }
.top-action:hover i { transform: translateX(4px); }

/* ===== 主导航 ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 26, 47, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-light);
  height: 72px;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  gap: 24px;
}
.logo { display: inline-flex; align-items: center; gap: 10px; flex-shrink: 0; }
.logo-icon {
  width: 40px; height: 40px;
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, #00d4ff, #00b4d8);
  color: #050d18;
  border-radius: var(--radius-sm);
  font-size: 18px;
  box-shadow: var(--glow);
}
.logo-text {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.01em;
  white-space: nowrap;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 6px;
  list-style: none;
}
.nav-links li a {
  display: block;
  padding: 8px 18px;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: all .25s ease;
  position: relative;
}
.nav-links li a:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.06);
}
.nav-links li a.active {
  color: var(--accent);
  background: rgba(0, 212, 255, 0.08);
}
.nav-links li a.active::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 2px;
  background: var(--accent);
  border-radius: 2px;
  box-shadow: var(--glow);
}
.header-cta { flex-shrink: 0; }
.mobile-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  width: 42px; height: 42px;
  color: var(--text-primary);
  font-size: 18px;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  transition: all .25s ease;
}
.mobile-toggle:hover { border-color: var(--accent); color: var(--accent); }

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 15px;
  font-weight: 600;
  line-height: 1;
  padding: 12px 28px;
  border-radius: 10px;
  cursor: pointer;
  border: none;
  transition: all .25s ease;
  white-space: nowrap;
}
.btn-primary {
  background: linear-gradient(135deg, #00d4ff, #00b4d8);
  color: #050d18;
  box-shadow: var(--glow);
}
.btn-primary:hover {
  filter: brightness(1.1);
  transform: translateY(-2px);
  color: #050d18;
}
.btn-primary:active { transform: scale(0.98); }
.btn-ghost {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.25);
  color: var(--text-primary);
}
.btn-ghost:hover {
  border-color: var(--accent);
  background: rgba(255, 255, 255, 0.05);
  color: var(--accent);
}
.btn-ghost:active { transform: scale(0.98); }
.btn-sm { padding: 9px 20px; font-size: 14px; }

/* ===== 面包屑 ===== */
.breadcrumb-wrap {
  background: var(--bg-deep);
  border-bottom: 1px solid var(--border-light);
  padding: 14px 0;
}
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--text-muted);
  flex-wrap: wrap;
}
.breadcrumb a { color: var(--text-secondary); transition: color .25s; }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb .current {
  color: var(--text-secondary);
  max-width: 360px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.breadcrumb i.fa-chevron-right { font-size: 10px; color: var(--text-muted); }

/* ===== 文章 Hero ===== */
.article-hero {
  position: relative;
  padding: 72px 0 64px;
  overflow: hidden;
}
.article-hero-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  z-index: 0;
}
.article-hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(5,13,24,0.4) 0%, rgba(5,13,24,0.92) 100%);
  z-index: 1;
}
.article-hero-content {
  position: relative;
  z-index: 2;
  max-width: 860px;
  margin: 0 auto;
  text-align: center;
  padding: 0 24px;
}
.article-cat-badge {
  display: inline-block;
  padding: 5px 16px;
  border-radius: 100px;
  background: rgba(255, 122, 0, 0.15);
  border: 1px solid rgba(255, 122, 0, 0.4);
  color: var(--accent-gold);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.04em;
  margin-bottom: 20px;
}
.article-hero h1 {
  font-size: 38px;
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: -0.01em;
  margin-bottom: 20px;
  color: var(--text-primary);
  word-break: break-word;
}
.article-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 22px;
  font-size: 14px;
  color: var(--text-secondary);
  flex-wrap: wrap;
}
.article-meta span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.article-meta i { font-size: 13px; color: var(--accent); }

/* ===== 文章主体 ===== */
.article-main {
  position: relative;
  background: var(--bg-primary);
  padding: 48px 0 80px;
  border-top: 1px solid var(--border-light);
}
.container-article { max-width: 860px; }
.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 48px 52px;
  box-shadow: var(--shadow-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

/* ===== 文章正文 ===== */
.article-body {
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-secondary);
  word-break: break-word;
}
.article-body h2 {
  font-size: 24px;
  font-weight: 700;
  color: var(--text-primary);
  margin: 36px 0 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-light);
  letter-spacing: -0.01em;
}
.article-body h2:first-child { margin-top: 0; }
.article-body h3 {
  font-size: 20px;
  font-weight: 600;
  color: var(--text-primary);
  margin: 28px 0 12px;
}
.article-body p {
  margin-bottom: 1.2em;
  line-height: 1.8;
}
.article-body p:last-child { margin-bottom: 0; }
.article-body img {
  border-radius: var(--radius-md);
  margin: 24px 0;
  box-shadow: var(--shadow-card);
  width: auto;
  height: auto;
}
.article-body blockquote {
  border-left: 3px solid var(--accent);
  background: rgba(0, 212, 255, 0.06);
  padding: 16px 20px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 24px 0;
  color: var(--text-secondary);
  font-style: normal;
}
.article-body ul,
.article-body ol {
  margin: 16px 0;
  padding-left: 24px;
}
.article-body li { margin-bottom: 8px; }
.article-body li::marker { color: var(--accent); }
.article-body a {
  color: var(--accent);
  border-bottom: 1px solid rgba(0, 212, 255, 0.3);
  transition: all .25s;
}
.article-body a:hover { color: #fff; border-bottom-color: var(--accent); }
.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 14px;
  border-radius: var(--radius-sm);
  overflow: hidden;
}
.article-body th {
  background: rgba(0, 212, 255, 0.08);
  text-align: left;
  padding: 12px 16px;
  border: 1px solid var(--border-light);
  font-weight: 600;
  color: var(--text-primary);
}
.article-body td {
  padding: 12px 16px;
  border: 1px solid var(--border-light);
  color: var(--text-secondary);
}
.article-body strong { color: var(--text-primary); font-weight: 600; }
.article-body hr {
  border: none;
  border-top: 1px solid var(--border-light);
  margin: 32px 0;
}

/* ===== 内容未找到 ===== */
.article-missing-wrap {
  padding: 80px 0 100px;
  min-height: 50vh;
  display: flex;
  align-items: center;
  justify-content: center;
}
.article-missing {
  text-align: center;
  padding: 60px 40px;
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  max-width: 520px;
  margin: 0 auto;
  box-shadow: var(--shadow-card);
}
.article-missing i {
  font-size: 48px;
  color: var(--accent);
  margin-bottom: 20px;
  display: block;
  opacity: 0.8;
}
.article-missing h1 {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-primary);
}
.article-missing p {
  color: var(--text-secondary);
  margin-bottom: 28px;
}

/* ===== 文章底部导航 ===== */
.article-post-nav {
  margin-top: 40px;
  padding-top: 32px;
  border-top: 1px solid var(--border-light);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.post-nav-link {
  display: block;
  padding: 18px 22px;
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  transition: all .3s ease;
}
.post-nav-link:hover {
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
}
.post-nav-link.next-link { text-align: right; }
.post-nav-label {
  display: block;
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 8px;
  letter-spacing: 0.04em;
}
.post-nav-title {
  display: block;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color .25s;
}
.post-nav-link:hover .post-nav-title { color: var(--accent); }

.article-actions {
  margin-top: 28px;
  text-align: center;
}

/* ===== 相关推荐 ===== */
.related-section {
  background: var(--bg-deep);
  padding: 80px 0;
  border-top: 1px solid var(--border-light);
}
.section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 40px;
  gap: 24px;
}
.section-head h2 {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.01em;
}
.view-all {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 15px;
  font-weight: 500;
  color: var(--accent);
  padding: 10px 22px;
  border: 1px solid rgba(0, 212, 255, 0.3);
  border-radius: 100px;
  transition: all .3s ease;
}
.view-all:hover {
  background: rgba(0, 212, 255, 0.08);
  border-color: var(--accent);
  color: var(--accent);
  transform: translateX(2px);
}
.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.news-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all .35s ease;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}
.news-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
}
.news-card-link { display: block; height: 100%; }
.news-thumb {
  aspect-ratio: 16/9;
  overflow: hidden;
  background: var(--bg-deep);
}
.news-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .4s ease;
}
.news-card:hover .news-thumb img { transform: scale(1.03); }
.news-body { padding: 20px 22px 24px; }
.news-tag {
  display: inline-block;
  padding: 3px 12px;
  border-radius: 100px;
  font-size: 12px;
  font-weight: 500;
  background: rgba(0, 212, 255, 0.1);
  color: var(--accent);
  letter-spacing: 0.03em;
  margin-bottom: 12px;
}
.news-body h3 {
  font-size: 17px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--text-primary);
  margin-bottom: 10px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  transition: color .25s;
}
.news-card:hover .news-body h3 { color: var(--accent); }
.news-body p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 14px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.news-date {
  font-size: 13px;
  color: var(--text-muted);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.news-date i { font-size: 12px; }

/* ===== CTA 区域 ===== */
.cta-section {
  position: relative;
  padding: 80px 0;
  overflow: hidden;
  border-top: 1px solid var(--border-light);
}
.cta-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  z-index: 0;
}
.cta-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(5,13,24,0.75) 0%, rgba(5,13,24,0.95) 100%);
  z-index: 1;
}
.cta-inner {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 760px;
  margin: 0 auto;
  padding: 0 24px;
}
.cta-inner::before {
  content: '';
  display: block;
  width: 120px;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  margin: 0 auto 32px;
  border-radius: 2px;
  box-shadow: var(--glow);
}
.cta-inner h2 {
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: 12px;
}
.cta-inner > p {
  color: var(--text-secondary);
  font-size: 16px;
  margin-bottom: 36px;
}
.cta-form {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr auto;
  gap: 12px;
  align-items: center;
  text-align: left;
}
.cta-form input,
.cta-form select {
  width: 100%;
  height: 48px;
  padding: 0 16px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-light);
  border-radius: 10px;
  color: var(--text-primary);
  font-size: 14px;
  outline: none;
  transition: all .25s ease;
}
.cta-form input::placeholder { color: var(--text-muted); }
.cta-form input:focus,
.cta-form select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.15);
  background: rgba(0, 212, 255, 0.04);
}
.cta-form select {
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%239AB3C8' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  cursor: pointer;
}
.cta-form select option { background: var(--bg-primary); color: var(--text-primary); }
.cta-form .btn { height: 48px; padding: 0 32px; }

/* ===== 页脚 ===== */
.site-footer {
  background: var(--bg-deep);
  border-top: 1px solid rgba(255, 255, 255, 0.04);
  padding: 64px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: 40px;
  padding-bottom: 48px;
}
.footer-brand .logo { margin-bottom: 20px; }
.footer-brand p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.7;
  max-width: 320px;
}
.footer-col h4 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 18px;
  position: relative;
  padding-bottom: 10px;
}
.footer-col h4::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 24px;
  height: 2px;
  background: var(--accent);
  border-radius: 2px;
}
.footer-col ul { list-style: none; }
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul a {
  font-size: 14px;
  color: var(--text-secondary);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all .25s;
}
.footer-col ul a i { font-size: 10px; transition: transform .25s; }
.footer-col ul a:hover { color: var(--accent); }
.footer-col ul a:hover i { transform: translateX(3px); }
.footer-contact li {
  font-size: 14px;
  color: var(--text-secondary);
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 12px;
}
.footer-contact li i { color: var(--accent); margin-top: 5px; font-size: 13px; }
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding: 20px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-size: 13px;
  color: var(--text-muted);
  flex-wrap: wrap;
}
.copyright { display: flex; align-items: center; gap: 8px; }
.copyright i { color: var(--accent); font-size: 12px; }

/* ===== 响应式 ===== */
@media (max-width: 1023px) {
  .nav-links {
    display: none;
    position: fixed;
    top: 112px;
    left: 0;
    right: 0;
    background: rgba(10, 26, 47, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    flex-direction: column;
    align-items: stretch;
    padding: 20px 24px;
    gap: 4px;
    border-bottom: 1px solid var(--border-light);
    z-index: 99;
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.5);
  }
  .nav-links.open { display: flex; }
  .nav-links li a {
    padding: 14px 16px;
    font-size: 16px;
    border-radius: var(--radius-sm);
  }
  .nav-links li a.active::after { display: none; }
  .mobile-toggle { display: inline-flex; }
  .header-cta { display: none; }
  .related-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .cta-form { grid-template-columns: 1fr 1fr; }
  .cta-form .btn { width: 100%; }
}

@media (max-width: 767px) {
  .container { padding: 0 16px; }
  .top-tip { display: none; }
  .top-bar-inner { gap: 10px; }
  .article-hero { padding: 48px 0 40px; }
  .article-hero h1 { font-size: 28px; }
  .article-meta { gap: 14px; font-size: 13px; flex-wrap: wrap; }
  .article-card { padding: 28px 22px; border-radius: var(--radius-md); }
  .article-main { padding: 32px 0 56px; }
  .article-body { font-size: 15px; line-height: 1.75; }
  .article-body h2 { font-size: 21px; }
  .article-body h3 { font-size: 18px; }
  .article-post-nav { grid-template-columns: 1fr; }
  .post-nav-link.next-link { text-align: left; }
  .related-grid { grid-template-columns: 1fr; }
  .section-head { flex-direction: column; align-items: flex-start; gap: 12px; }
  .section-head h2 { font-size: 24px; }
  .cta-section { padding: 56px 0; }
  .cta-inner h2 { font-size: 26px; }
  .cta-form { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .breadcrumb .current { max-width: 200px; }
}

@media (max-width: 520px) {
  .logo-text { font-size: 17px; }
  .logo-icon { width: 36px; height: 36px; font-size: 16px; }
  .article-hero h1 { font-size: 24px; }
  .btn { padding: 12px 22px; }
}

/* ===== 动画 ===== */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}
.animate-fade-up { animation: fadeInUp .6s ease both; }
.animate-delay-1 { animation-delay: .15s; }
.animate-delay-2 { animation-delay: .3s; }

/* roulang page: category2 */
:root {
  --bg-deep: #050D18;
  --bg-navy: #0A1A2F;
  --bg-card: rgba(255,255,255,0.04);
  --border-card: rgba(255,255,255,0.08);
  --primary: #00D4FF;
  --primary-dark: #00B4D8;
  --accent: #FF7A00;
  --text-main: #E8F0F8;
  --text-sub: #9AB3C8;
  --text-dim: #5A7388;
  --radius-lg: 24px;
  --radius-md: 16px;
  --radius-sm: 8px;
  --shadow-card: 0 8px 32px rgba(0,0,0,0.35), 0 0 0 1px rgba(255,255,255,0.05);
  --glow: 0 0 24px rgba(0,212,255,0.35);
  --container: 1280px;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  background: var(--bg-deep);
  color: var(--text-main);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button, input, select, textarea { font-family: inherit; }
.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }

/* 顶部信息条 */
.top-bar {
  background: #060E1A;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  height: 40px;
  display: flex;
  align-items: center;
  font-size: 13px;
  color: var(--text-sub);
}
.top-inner { display: flex; align-items: center; gap: 12px; width: 100%; }
.top-domain { color: var(--primary); font-weight: 600; letter-spacing: 0.02em; }
.top-divider { color: rgba(255,255,255,0.2); }
.top-tip { flex: 1; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.top-action {
  color: var(--text-main);
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: color 0.2s ease, transform 0.2s ease;
  white-space: nowrap;
}
.top-action:hover { color: var(--primary); }
.top-action i { transition: transform 0.2s ease; }
.top-action:hover i { transform: translateX(3px); }

/* 主导航 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(10, 26, 47, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255,255,255,0.07);
  height: 72px;
  display: flex;
  align-items: center;
}
.nav-wrap { display: flex; align-items: center; justify-content: space-between; gap: 24px; width: 100%; }
.logo { display: inline-flex; align-items: center; gap: 10px; flex-shrink: 0; }
.logo-icon {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #05121F;
  font-size: 18px;
  box-shadow: var(--glow);
}
.logo-text { font-size: 20px; font-weight: 700; letter-spacing: -0.01em; white-space: nowrap; }
.nav-links { display: flex; align-items: center; gap: 6px; }
.nav-links a {
  display: inline-flex;
  align-items: center;
  height: 40px;
  padding: 0 16px;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-sub);
  transition: color 0.2s, background 0.2s, box-shadow 0.2s;
}
.nav-links a:hover { color: var(--text-main); background: rgba(255,255,255,0.05); }
.nav-links a.active { color: var(--primary); background: rgba(0,212,255,0.08); box-shadow: inset 0 0 0 1px rgba(0,212,255,0.2); }
.nav-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 40px;
  padding: 0 20px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #05121F;
  font-weight: 600;
  font-size: 14px;
  box-shadow: var(--glow);
  transition: transform 0.2s, box-shadow 0.2s, filter 0.2s;
  white-space: nowrap;
}
.nav-cta:hover { filter: brightness(1.08); transform: translateY(-2px); box-shadow: 0 0 30px rgba(0,212,255,0.5); }
.nav-cta:active { transform: scale(0.98); }
.menu-toggle {
  display: none;
  background: none;
  border: 1px solid rgba(255,255,255,0.15);
  color: var(--text-main);
  width: 44px;
  height: 44px;
  border-radius: 10px;
  font-size: 18px;
  cursor: pointer;
  align-items: center;
  justify-content: center;
}
.menu-toggle.active { border-color: rgba(0,212,255,0.4); color: var(--primary); }

/* 分类页标题区 */
.cat-hero {
  position: relative;
  padding: 80px 0 72px;
  background:
    linear-gradient(180deg, rgba(5,13,24,0.55) 0%, rgba(5,13,24,0.88) 100%),
    url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
  border-bottom: 1px solid rgba(0,212,255,0.25);
}
.cat-hero::after {
  content: '';
  position: absolute;
  left: 0; right: 0; bottom: -1px;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0,212,255,0.6), transparent);
}
.breadcrumb {
  font-size: 13px;
  color: var(--text-dim);
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.breadcrumb a { color: var(--text-sub); transition: color 0.2s; }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb i { font-size: 11px; color: var(--text-dim); }
.cat-hero h1 {
  font-size: 44px;
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.2;
  margin-bottom: 16px;
  background: linear-gradient(120deg, #FFFFFF, rgba(233,249,255,0.85));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.cat-hero .subtitle {
  font-size: 17px;
  color: var(--text-sub);
  max-width: 680px;
  line-height: 1.75;
}
.hero-stat {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-md);
  padding: 20px;
  text-align: center;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: border-color 0.3s, transform 0.3s;
}
.hero-stat:hover { border-color: rgba(0,212,255,0.35); transform: translateY(-3px); }
.hero-stat .num { font-size: 34px; font-weight: 700; color: var(--primary); line-height: 1.1; }
.hero-stat .label { font-size: 13px; color: var(--text-dim); margin-top: 6px; }

/* 频道卡片网格 */
.channel-section { padding: 100px 0; background: var(--bg-deep); }
.section-head { text-align: center; max-width: 640px; margin: 0 auto 56px; }
.section-head h2 { font-size: 32px; font-weight: 700; letter-spacing: -0.01em; margin-bottom: 12px; }
.section-head p { color: var(--text-sub); font-size: 16px; }
.channel-card {
  display: flex;
  gap: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 32px;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: var(--shadow-card);
  transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}
.channel-card:hover {
  transform: translateY(-4px);
  border-color: rgba(0,212,255,0.35);
  box-shadow: 0 12px 36px rgba(0,0,0,0.45), 0 0 0 1px rgba(0,212,255,0.1), 0 0 20px rgba(0,212,255,0.12);
}
.channel-icon {
  flex-shrink: 0;
  width: 56px;
  height: 56px;
  border-radius: 16px;
  background: linear-gradient(135deg, rgba(0,212,255,0.18), rgba(0,180,216,0.08));
  border: 1px solid rgba(0,212,255,0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  color: var(--primary);
}
.channel-body { flex: 1; min-width: 0; }
.channel-body h3 { font-size: 20px; font-weight: 600; margin-bottom: 8px; }
.channel-body p { font-size: 15px; color: var(--text-sub); line-height: 1.7; }
.channel-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.channel-tags span {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--primary);
  background: rgba(0,212,255,0.08);
  border: 1px solid rgba(0,212,255,0.15);
  padding: 4px 12px;
  border-radius: 999px;
}

/* 使用流程区 */
.steps-section { padding: 0 0 100px; background: var(--bg-deep); }
.step-item {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 32px;
  text-align: center;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  transition: transform 0.3s, border-color 0.3s;
}
.step-item:hover { transform: translateY(-4px); border-color: rgba(0,212,255,0.3); }
.step-num {
  font-size: 44px;
  font-weight: 700;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px var(--primary);
  opacity: 0.7;
  margin-bottom: 16px;
  text-shadow: 0 0 30px rgba(0,212,255,0.25);
}
.step-item h3 { font-size: 19px; font-weight: 600; margin-bottom: 10px; }
.step-item p { font-size: 14px; color: var(--text-sub); line-height: 1.65; }

/* FAQ */
.faq-section { padding: 0 0 100px; background: var(--bg-deep); }
.faq-list { max-width: 860px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: 14px;
  overflow: hidden;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  transition: border-color 0.3s;
}
.faq-item.open { border-color: rgba(0,212,255,0.3); }
.faq-q {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 24px;
  cursor: pointer;
  font-size: 15px;
  font-weight: 500;
  border: none;
  background: none;
  color: var(--text-main);
  width: 100%;
  text-align: left;
}
.faq-q .icon {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  border-radius: 6px;
  background: rgba(0,212,255,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  font-size: 14px;
  transition: transform 0.25s ease;
}
.faq-item.open .faq-q .icon { transform: rotate(45deg); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height 0.28s ease; }
.faq-a p { padding: 0 24px 18px; color: var(--text-sub); font-size: 14px; line-height: 1.7; }

/* CTA */
.cat-cta { position: relative; padding: 0 0 100px; background: var(--bg-deep); }
.cta-bar {
  position: relative;
  border-radius: var(--radius-lg);
  padding: 48px 56px;
  overflow: hidden;
  background:
    linear-gradient(120deg, rgba(0,212,255,0.12), rgba(255,122,0,0.08)),
    url('/assets/images/coverpic/cover-5.webp') center/cover no-repeat;
  border: 1px solid rgba(0,212,255,0.25);
  box-shadow: var(--shadow-card);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
}
.cta-bar::before {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(90deg, rgba(5,13,24,0.92), rgba(5,13,24,0.68), rgba(5,13,24,0.88));
}
.cta-bar h2 { position: relative; font-size: 28px; font-weight: 700; margin-bottom: 8px; }
.cta-bar p { position: relative; color: var(--text-sub); font-size: 15px; max-width: 560px; }
.cta-bar .btn-group { position: relative; display: flex; gap: 14px; flex-wrap: wrap; }
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 48px;
  padding: 0 28px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #05121F;
  font-weight: 600;
  font-size: 15px;
  box-shadow: var(--glow);
  border: none;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s, filter 0.2s;
  min-height: 44px;
}
.btn-primary:hover { filter: brightness(1.1); transform: translateY(-2px); box-shadow: 0 0 30px rgba(0,212,255,0.5); }
.btn-primary:active { transform: scale(0.98); }
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 48px;
  padding: 0 28px;
  border-radius: 10px;
  background: transparent;
  border: 1px solid rgba(255,255,255,0.35);
  color: var(--text-main);
  font-weight: 500;
  font-size: 15px;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s, transform 0.2s;
  min-height: 44px;
}
.btn-secondary:hover { border-color: var(--primary); background: rgba(255,255,255,0.06); color: var(--primary); }
.btn-secondary:active { transform: scale(0.98); }

/* 页脚 */
.site-footer {
  position: relative;
  background: #060E1A;
  border-top: 1px solid rgba(255,255,255,0.06);
  padding: 64px 0 28px;
}
.footer-grid { gap: 40px; margin-bottom: 48px; }
.footer-brand .logo { margin-bottom: 16px; }
.footer-brand p { font-size: 14px; color: var(--text-sub); line-height: 1.75; max-width: 320px; }
.footer-col h4 { font-size: 14px; font-weight: 600; letter-spacing: 0.05em; color: var(--text-main); margin-bottom: 18px; }
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul a {
  font-size: 14px;
  color: var(--text-sub);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: color 0.2s, transform 0.2s;
}
.footer-col ul a i { font-size: 10px; opacity: 0.5; transition: opacity 0.2s, transform 0.2s; }
.footer-col ul a:hover { color: var(--primary); transform: translateX(3px); }
.footer-col ul a:hover i { opacity: 1; transform: translateX(2px); }
.footer-contact li { display: flex; gap: 10px; font-size: 13px; color: var(--text-sub); margin-bottom: 12px; align-items: flex-start; }
.footer-contact i { color: var(--primary); margin-top: 2px; }
.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  padding-top: 24px;
  border-top: 1px solid rgba(255,255,255,0.06);
  font-size: 13px;
  color: var(--text-dim);
}
.copyright { display: inline-flex; align-items: center; gap: 6px; }

/* 响应式 */
@media (max-width: 1023px) {
  .nav-links {
    position: fixed;
    top: 72px;
    left: 0; right: 0;
    background: rgba(10, 26, 47, 0.97);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    flex-direction: column;
    align-items: stretch;
    padding: 16px;
    gap: 4px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
    display: none;
    box-shadow: 0 16px 32px rgba(0,0,0,0.4);
  }
  .nav-links.open { display: flex; }
  .nav-links a { justify-content: center; height: 48px; }
  .menu-toggle { display: inline-flex; }
  .cat-hero h1 { font-size: 36px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 767px) {
  .top-tip { display: none; }
  body { font-size: 15px; }
  .cat-hero { padding: 56px 0 48px; }
  .cat-hero h1 { font-size: 30px; }
  .cat-hero .subtitle { font-size: 16px; }
  .hero-stat { padding: 14px; }
  .hero-stat .num { font-size: 26px; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .cta-bar { padding: 32px 24px; }
  .cta-bar h2 { font-size: 22px; }
  .container { padding: 0 16px; }
  .channel-section, .faq-section, .steps-section { padding: 56px 0; }
  .channel-section .section-head { margin-bottom: 40px; }
  .channel-card { padding: 24px; flex-direction: column; }
  .section-head h2 { font-size: 26px; }
  .footer-bottom { flex-direction: column; text-align: center; }
}
@media (max-width: 520px) {
  .btn-group .btn-primary, .btn-group .btn-secondary { width: 100%; }
}

/* roulang page: category3 */
:root {
  --bg-primary: #0A1A2F;
  --bg-deeper: #050D18;
  --accent: #00D4FF;
  --accent-2: #00B4D8;
  --energy: #FF7A00;
  --energy-2: #FFB800;
  --card-bg: rgba(255,255,255,0.04);
  --card-border: rgba(255,255,255,0.08);
  --text-primary: #E8F0F8;
  --text-secondary: #9AB3C8;
  --text-muted: #5A7388;
  --radius-lg: 24px;
  --radius-md: 16px;
  --radius-sm: 10px;
  --glow: 0 0 24px rgba(0,212,255,0.35);
  --shadow: 0 8px 32px rgba(0,0,0,0.35);
  --font: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --container: 1280px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  font-size: 16px;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }

/* ===== 顶部信息条 ===== */
.topbar {
  height: 40px;
  background: #060D18;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.topbar-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.topbar-left {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: var(--text-muted);
}
.topbar-domain { color: var(--text-secondary); font-weight: 500; }
.topbar-dot { font-size: 6px; color: var(--accent); }
.topbar-hint { color: var(--text-muted); }
.topbar-link {
  font-size: 13px;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all .25s ease;
}
.topbar-link:hover { color: #7fe9ff; }
.topbar-link i { font-size: 11px; transition: transform .25s ease; }
.topbar-link:hover i { transform: translateX(3px); }

/* ===== 主导航 ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(7,17,32,0.88);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.header-main { height: 72px; position: relative; }
.header-inner {
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}
.logo { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.logo-icon {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #04223a;
  box-shadow: var(--glow);
  font-size: 17px;
}
.logo-text { font-size: 20px; font-weight: 700; letter-spacing: -0.01em; white-space: nowrap; }
.nav-links { display: flex; gap: 26px; align-items: center; }
.nav-links a {
  font-size: 15px;
  color: var(--text-secondary);
  transition: color .25s ease;
  padding: 8px 0;
  position: relative;
}
.nav-links a:hover { color: var(--accent); }
.nav-links a.active { color: var(--accent); }
.nav-links a.active::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), transparent);
  border-radius: 2px;
}
.header-cta { height: 40px; flex-shrink: 0; }
.nav-toggle { display: none; width: 42px; height: 42px; align-items: center; justify-content: center; font-size: 20px; color: var(--text-primary); border: 1px solid rgba(255,255,255,0.12); border-radius: 10px; }

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  line-height: 1;
  letter-spacing: .02em;
  transition: all .25s ease;
}
.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #04223a;
  box-shadow: var(--glow);
  padding: 14px 30px;
}
.btn-primary:hover {
  filter: brightness(1.1);
  transform: translateY(-2px);
  box-shadow: 0 0 32px rgba(0,212,255,0.5);
}
.btn-primary:active { transform: scale(0.98); }
.btn-secondary {
  background: transparent;
  border: 1px solid rgba(255,255,255,0.4);
  color: var(--text-primary);
  padding: 13px 30px;
}
.btn-secondary:hover { border-color: var(--accent); color: var(--accent); background: rgba(255,255,255,0.05); }
.btn-secondary:active { transform: scale(0.98); }
.btn-sm { padding: 10px 22px; font-size: 14px; }
.btn-block { width: 100%; }

/* ===== 页面横幅 ===== */
.page-banner {
  position: relative;
  padding: 88px 0 72px;
  overflow: hidden;
  background: url('/assets/images/backpic/back-2.webp') center/cover no-repeat, linear-gradient(135deg, #0A1A2F, #050D18);
}
.page-banner::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(5,13,24,0.35) 0%, rgba(5,13,24,0.55) 40%, rgba(5,13,24,0.92) 100%);
}
.page-banner::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  box-shadow: 0 0 20px rgba(0,212,255,0.5);
}
.banner-content { position: relative; z-index: 2; }
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 20px;
}
.breadcrumb a { transition: color .25s; }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb i { font-size: 10px; color: var(--text-muted); }
.breadcrumb .current { color: var(--text-secondary); }
.banner-title {
  font-size: 42px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin-bottom: 16px;
}
.banner-title .highlight { color: var(--accent); }
.banner-subtitle {
  font-size: 18px;
  color: var(--text-secondary);
  max-width: 680px;
  line-height: 1.8;
}
.stats-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 48px;
  position: relative;
  z-index: 2;
}
.stat-item {
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  padding: 22px 18px;
  backdrop-filter: blur(20px);
  text-align: center;
  transition: border-color .3s ease, transform .3s ease;
}
.stat-item:hover { border-color: rgba(0,212,255,0.35); transform: translateY(-3px); }
.stat-num { font-size: 38px; font-weight: 700; color: var(--accent); line-height: 1.1; }
.stat-num.orange { color: var(--energy); text-shadow: 0 0 22px rgba(255,122,0,0.3); }
.stat-label { font-size: 13px; color: var(--text-muted); margin-top: 8px; }

/* ===== 内容主区域 ===== */
.content-section { padding: 90px 0; position: relative; }
.content-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 48px;
  align-items: start;
}
.section-title { font-size: 30px; font-weight: 700; letter-spacing: -0.01em; margin-bottom: 10px; }
.section-intro { color: var(--text-secondary); margin-bottom: 38px; max-width: 600px; line-height: 1.8; }
.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--accent);
  letter-spacing: .08em;
  margin-bottom: 12px;
}
.section-tag::before {
  content: "";
  width: 24px;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), transparent);
  border-radius: 2px;
}

/* ===== 图文混排福利列表 ===== */
.benefit-list { display: flex; flex-direction: column; gap: 32px; }
.benefit-card {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  backdrop-filter: blur(20px);
  transition: transform .3s ease, border-color .3s ease, box-shadow .3s ease;
}
.benefit-card:hover {
  transform: translateY(-4px);
  border-color: rgba(0,212,255,0.4);
  box-shadow: var(--shadow), 0 0 20px rgba(0,212,255,0.15);
}
.benefit-thumb { aspect-ratio: 16 / 10; overflow: hidden; position: relative; }
.benefit-thumb::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 55%, rgba(5,13,24,0.45));
}
.benefit-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s ease; }
.benefit-card:hover .benefit-thumb img { transform: scale(1.03); }
.benefit-body { padding: 26px 28px; display: flex; flex-direction: column; }
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .04em;
  padding: 4px 12px;
  border-radius: 999px;
  background: rgba(255,122,0,0.15);
  color: var(--energy-2);
  align-self: flex-start;
}
.badge.cyan { background: rgba(0,212,255,0.12); color: var(--accent); }
.benefit-title { font-size: 20px; font-weight: 600; margin: 14px 0 8px; letter-spacing: -0.01em; }
.benefit-desc { font-size: 15px; color: var(--text-secondary); line-height: 1.75; margin-bottom: 16px; }
.benefit-meta { display: flex; flex-wrap: wrap; gap: 10px; margin-top: auto; }
.benefit-meta span {
  font-size: 13px;
  color: var(--text-muted);
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.05);
  padding: 4px 10px;
  border-radius: 8px;
  line-height: 1.4;
}

/* ===== 侧边栏 ===== */
.sidebar { display: flex; flex-direction: column; gap: 28px; position: sticky; top: 100px; }
.side-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  padding: 26px;
  backdrop-filter: blur(20px);
}
.side-card h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 18px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--card-border);
  display: flex;
  align-items: center;
  gap: 10px;
}
.side-card h3 i { color: var(--accent); font-size: 16px; }
.related-list { display: flex; flex-direction: column; gap: 14px; }
.related-item {
  display: flex;
  gap: 12px;
  align-items: center;
  padding: 10px;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  transition: background .25s ease, border-color .25s ease;
}
.related-item:hover { background: rgba(255,255,255,0.05); border-color: rgba(0,212,255,0.25); }
.related-item img { width: 64px; height: 48px; object-fit: cover; border-radius: 8px; flex-shrink: 0; }
.related-item .related-text { flex: 1; }
.related-item span { font-size: 14px; color: var(--text-secondary); line-height: 1.4; display: block; transition: color .25s; }
.related-item:hover span { color: var(--accent); }
.related-item small { font-size: 12px; color: var(--text-muted); }
.promo-spot {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  min-height: 230px;
  display: flex;
  align-items: flex-end;
}
.promo-spot img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.promo-spot::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(5,13,24,0.1) 0%, rgba(5,13,24,0.9) 100%);
}
.promo-content { position: relative; z-index: 2; padding: 24px; }
.promo-content strong { display: block; font-size: 19px; margin-bottom: 6px; }
.promo-content p { font-size: 13px; color: var(--text-secondary); line-height: 1.6; }
.service-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--text-secondary);
  padding: 9px 0;
  border-bottom: 1px solid rgba(255,255,255,0.05);
}
.service-list li:last-child { border-bottom: none; }
.service-list i { color: var(--accent); width: 18px; text-align: center; flex-shrink: 0; }
.service-note {
  margin-top: 14px;
  padding: 12px 14px;
  border-radius: 10px;
  background: rgba(0,212,255,0.07);
  border: 1px solid rgba(0,212,255,0.15);
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ===== CTA区 ===== */
.cta-section {
  position: relative;
  padding: 80px 0;
  background: var(--bg-deeper);
  overflow: hidden;
}
.cta-section::before {
  content: "";
  position: absolute;
  top: 0;
  left: 8%;
  right: 8%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  box-shadow: 0 0 24px rgba(0,212,255,0.5);
}
.cta-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 480px;
  gap: 56px;
  align-items: center;
  position: relative;
  z-index: 2;
}
.cta-copy h2 { font-size: 32px; font-weight: 700; margin-bottom: 14px; letter-spacing: -0.01em; line-height: 1.25; }
.cta-copy > p { color: var(--text-secondary); margin-bottom: 26px; line-height: 1.8; max-width: 480px; }
.cta-points li {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-secondary);
  padding: 7px 0;
  font-size: 15px;
}
.cta-points i { color: var(--accent); font-size: 16px; }
.cta-form-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  backdrop-filter: blur(20px);
  box-shadow: var(--shadow);
}
.cta-form-card h3 { font-size: 20px; font-weight: 600; margin-bottom: 6px; }
.cta-form-card > p { font-size: 14px; color: var(--text-muted); margin-bottom: 22px; line-height: 1.6; }
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-size: 12px; color: var(--text-secondary); margin-bottom: 6px; letter-spacing: .04em; }
.form-input {
  width: 100%;
  height: 44px;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 10px;
  padding: 0 14px;
  color: var(--text-primary);
  font-size: 14px;
  transition: border-color .25s ease, box-shadow .25s ease;
}
.form-input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 16px rgba(0,212,255,0.2);
}
select.form-input { appearance: none; background-image: url("data:image/svg+xml;charset=utf8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' fill='%239AB3C8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 14px center; padding-right: 36px; }
.form-hint { font-size: 12px; color: var(--text-muted); text-align: center; margin-top: 14px; line-height: 1.6; }

/* ===== FAQ ===== */
.faq-section { padding: 90px 0; }
.faq-header { text-align: center; margin-bottom: 44px; }
.faq-header .section-tag { justify-content: center; }
.faq-header .section-tag::before { display: none; }
.faq-header .section-tag::after {
  content: "";
  width: 24px;
  height: 2px;
  background: linear-gradient(270deg, var(--accent), transparent);
  border-radius: 2px;
}
.faq-list { max-width: 820px; margin: 0 auto; display: flex; flex-direction: column; gap: 14px; }
.faq-item {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 14px;
  overflow: hidden;
  backdrop-filter: blur(20px);
  transition: border-color .25s ease, box-shadow .25s ease;
}
.faq-item:hover { border-color: rgba(0,212,255,0.3); }
.faq-item.open { border-color: rgba(0,212,255,0.45); box-shadow: 0 0 20px rgba(0,212,255,0.08); }
.faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  padding: 18px 22px;
  color: var(--text-primary);
  font-size: 15px;
  font-weight: 500;
  text-align: left;
  gap: 16px;
  line-height: 1.5;
}
.faq-icon { transition: transform .25s ease; color: var(--accent); font-size: 20px; flex-shrink: 0; font-weight: 300; }
.faq-item.open .faq-icon { transform: rotate(45deg); }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height .3s ease;
  padding: 0 22px;
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.75;
}
.faq-item.open .faq-answer { max-height: 220px; padding-bottom: 18px; }

/* ===== 页脚 ===== */
.site-footer { background: var(--bg-deeper); border-top: 1px solid rgba(255,255,255,0.06); padding: 60px 0 0; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 40px; padding-bottom: 44px; }
.footer-brand .logo { margin-bottom: 2px; }
.footer-brand .logo-text { font-size: 19px; }
.footer-brand p {
  font-size: 14px;
  color: var(--text-muted);
  margin-top: 16px;
  line-height: 1.75;
  max-width: 300px;
}
.footer-col h4 { font-size: 15px; font-weight: 600; margin-bottom: 18px; color: var(--text-primary); }
.footer-col ul li { margin-bottom: 12px; }
.footer-col a {
  font-size: 14px;
  color: var(--text-secondary);
  transition: color .25s ease, padding-left .25s ease;
}
.footer-col a:hover { color: var(--accent); padding-left: 6px; }
.footer-col a i { font-size: 10px; margin-left: 4px; opacity: .7; }
.footer-contact li {
  font-size: 14px;
  color: var(--text-muted);
  display: flex;
  gap: 10px;
  align-items: flex-start;
  line-height: 1.6;
}
.footer-contact li i { color: var(--accent); width: 18px; margin-top: 3px; flex-shrink: 0; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.06);
  padding: 20px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 13px;
  color: var(--text-muted);
}
.footer-bottom .copyright { display: flex; align-items: center; gap: 6px; }

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .nav-links { gap: 18px; }
  .benefit-card { grid-template-columns: 180px minmax(0, 1fr); }
  .content-grid { grid-template-columns: 1fr; }
  .sidebar { position: static; display: grid; grid-template-columns: repeat(3, 1fr); align-items: stretch; }
  .promo-spot { min-height: 190px; }
  .cta-grid { grid-template-columns: 1fr 420px; gap: 40px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 767px) {
  .container { padding: 0 16px; }
  .topbar-hint { display: none; }
  .topbar-link span { display: none; }
  .nav-toggle { display: flex; }
  .nav-links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(7,17,32,0.97);
    flex-direction: column;
    align-items: flex-start;
    padding: 16px 24px 20px;
    gap: 4px;
    display: none;
    border-bottom: 1px solid rgba(255,255,255,0.08);
    box-shadow: 0 24px 40px rgba(0,0,0,0.4);
  }
  .nav-links.show { display: flex; }
  .nav-links a { padding: 12px 0; font-size: 16px; display: block; width: 100%; }
  .nav-links a.active::after { width: 40px; }
  .header-cta { display: none; }
  .banner-title { font-size: 30px; }
  .banner-subtitle { font-size: 16px; }
  .stats-strip { grid-template-columns: repeat(2, 1fr); gap: 14px; }
  .stat-num { font-size: 30px; }
  .content-section { padding: 64px 0; }
  .section-title { font-size: 26px; }
  .benefit-card { grid-template-columns: 1fr; }
  .benefit-thumb { aspect-ratio: 16 / 8; }
  .benefit-body { padding: 22px; }
  .sidebar { grid-template-columns: 1fr; }
  .cta-grid { grid-template-columns: 1fr; gap: 32px; }
  .cta-copy h2 { font-size: 26px; }
  .cta-form-card { padding: 24px; }
  .faq-section { padding: 64px 0; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
}