/* roulang page: index */
:root {
      --primary-dark: #0A0E27;
      --secondary-dark: #161B3A;
      --accent-cyan: #00F0FF;
      --accent-purple: #7B2FFF;
      --text-white: #FFFFFF;
      --text-body: #B0C4DE;
      --text-muted: #6B7B94;
      --border-glow: rgba(0,240,255,0.15);
      --card-bg: rgba(15,20,45,0.7);
      --shadow-card: 0 4px 24px rgba(0,0,0,0.4);
      --shadow-hover: 0 8px 32px rgba(0,240,255,0.25);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-tag: 6px;
      --font-heading: 'PingFang SC','Microsoft YaHei','Helvetica Neue',sans-serif;
      --font-body: 'PingFang SC','Microsoft YaHei','Helvetica Neue',sans-serif;
    }
    *,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
    html{scroll-behavior:smooth}
    body{
      font-family:var(--font-body);
      background:var(--primary-dark);
      color:var(--text-body);
      line-height:1.7;
      font-size:15px;
      -webkit-font-smoothing:antialiased;
      background-image:radial-gradient(circle at 20% 10%, rgba(0,240,255,0.03) 0%, transparent 35%),
                        radial-gradient(circle at 80% 60%, rgba(123,47,255,0.04) 0%, transparent 40%);
      background-attachment:fixed;
    }
    .container{max-width:1200px;margin:0 auto;padding:0 20px}
    img{max-width:100%;height:auto;display:block}
    a{text-decoration:none;color:inherit;transition:color 0.2s}
    h1,h2,h3{font-family:var(--font-heading);color:var(--text-white)}
    h1{font-size:48px;line-height:1.2;font-weight:700;letter-spacing:-0.5px}
    h2{font-size:36px;line-height:1.25;font-weight:600}
    h3{font-size:20px;line-height:1.4;font-weight:600}
    .section{padding:100px 0}
    @media(max-width:1024px){.section{padding:80px 0}}
    @media(max-width:640px){
      .section{padding:60px 0}
      h1{font-size:32px}
      h2{font-size:24px}
    }
    /* 按钮系统 */
    .btn{
      display:inline-flex;align-items:center;justify-content:center;
      padding:12px 28px;border-radius:var(--radius-btn);font-weight:600;
      font-size:15px;transition:all 0.3s ease;cursor:pointer;border:none;
      font-family:var(--font-body);letter-spacing:0.3px;
    }
    .btn-primary{
      background:linear-gradient(135deg, #00F0FF 0%, #00C8E0 100%);
      color:#0A0E27;
      box-shadow:0 0 20px rgba(0,240,255,0.5);
    }
    .btn-primary:hover{
      box-shadow:0 0 32px rgba(0,240,255,0.8);
      transform:scale(1.03);
      color:#0A0E27;
    }
    .btn-outline{
      background:transparent;
      border:1px solid var(--accent-cyan);
      color:var(--accent-cyan);
    }
    .btn-outline:hover{
      background:rgba(0,240,255,0.08);
      color:var(--accent-cyan);
    }
    .btn-sm{padding:8px 20px;font-size:13px}
    /* 导航 */
    .site-header{
      position:fixed;top:0;left:0;width:100%;z-index:100;
      height:72px;background:rgba(10,14,39,0.85);
      backdrop-filter:blur(20px);
      border-bottom:1px solid rgba(255,255,255,0.05);
      display:flex;align-items:center;
    }
    .header-inner{
      display:flex;align-items:center;justify-content:space-between;
      width:100%;max-width:1200px;margin:0 auto;padding:0 20px;
    }
    .logo{
      font-family:var(--font-heading);font-weight:700;font-size:22px;
      color:var(--text-white);display:flex;align-items:center;gap:8px;
    }
    .logo i{color:var(--accent-cyan);font-size:26px}
    .nav-links{display:flex;align-items:center;gap:40px}
    .nav-links a{
      color:var(--text-body);font-size:15px;font-weight:500;
      position:relative;padding:6px 0;
    }
    .nav-links a::after{
      content:'';position:absolute;bottom:-2px;left:0;width:0;height:2px;
      background:var(--accent-cyan);transition:width 0.3s;
    }
    .nav-links a:hover{color:var(--accent-cyan)}
    .nav-links a:hover::after{width:100%}
    .nav-links a.active{color:var(--accent-cyan)}
    .nav-links a.active::after{width:100%}
    .nav-divider{width:1px;height:20px;background:rgba(255,255,255,0.1)}
    .mobile-toggle{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer}
    .mobile-toggle span{width:24px;height:2px;background:var(--text-white);border-radius:2px;transition:0.3s}
    @media(max-width:1024px){
      .nav-links{display:none}
      .mobile-toggle{display:flex}
      .nav-links.mobile-open{
        display:flex;flex-direction:column;position:absolute;
        top:72px;left:0;width:100%;background:rgba(10,14,39,0.96);
        backdrop-filter:blur(30px);padding:30px;gap:24px;align-items:center;
      }
      .nav-divider{display:none}
    }
    /* Hero */
    .hero{
      min-height:85vh;display:flex;align-items:center;
      background:linear-gradient(180deg, #0A0E27 0%, #161B3A 100%);
      position:relative;overflow:hidden;
    }
    .hero::before{
      content:'';position:absolute;top:0;left:0;width:100%;height:100%;
      background-image:url('/assets/images/backpic/back-1.webp');
      background-size:cover;background-position:center;opacity:0.15;
      z-index:0;
    }
    .hero .container{position:relative;z-index:2}
    .hero-grid{display:flex;align-items:center;gap:60px}
    .hero-text{flex:1}
    .hero-text h1{margin-bottom:20px}
    .hero-subtitle{font-size:18px;color:var(--text-body);margin-bottom:28px;max-width:500px}
    .hero-actions{display:flex;gap:16px;flex-wrap:wrap;margin-bottom:36px}
    .trust-badges{display:flex;gap:30px;flex-wrap:wrap}
    .trust-item{text-align:left}
    .trust-number{font-size:28px;font-weight:700;color:var(--accent-cyan);display:block}
    .trust-label{font-size:13px;color:var(--text-muted)}
    .hero-image{
      flex:1;border-radius:var(--radius-card);overflow:hidden;
      border:1px solid var(--border-glow);
      box-shadow:0 0 30px rgba(0,240,255,0.15);
      background:rgba(15,20,45,0.6);
      backdrop-filter:blur(10px);
    }
    .hero-image img{width:100%;height:auto;display:block}
    @media(max-width:1024px){
      .hero-grid{flex-direction:column;text-align:center}
      .hero-text{text-align:center}
      .hero-subtitle{margin-left:auto;margin-right:auto}
      .hero-actions{justify-content:center}
      .trust-badges{justify-content:center}
      .hero-image{max-width:500px;margin:0 auto}
    }
    /* 卡片通用 */
    .card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
    .card{
      background:var(--card-bg);backdrop-filter:blur(16px);
      border:1px solid var(--border-glow);border-radius:var(--radius-card);
      padding:32px;transition:all 0.3s ease;
      box-shadow:var(--shadow-card);
    }
    .card:hover{
      transform:translateY(-4px);
      box-shadow:var(--shadow-hover);
      border-color:rgba(0,240,255,0.35);
    }
    .card-icon{font-size:40px;color:var(--accent-cyan);margin-bottom:20px;filter:drop-shadow(0 0 8px rgba(0,240,255,0.4))}
    .card h3{margin-bottom:12px}
    .card p{color:var(--text-body);font-size:14px;margin-bottom:0}
    @media(max-width:1024px){.card-grid{grid-template-columns:repeat(2,1fr)}}
    @media(max-width:640px){.card-grid{grid-template-columns:1fr}}
    /* 功能图文 */
    .feature-row{display:flex;align-items:center;gap:50px;margin-bottom:80px}
    .feature-row.reverse{flex-direction:row-reverse}
    .feature-content{flex:1}
    .feature-content h2{margin-bottom:16px}
    .feature-content p{color:var(--text-body);margin-bottom:20px}
    .feature-img{
      flex:1;border-radius:var(--radius-card);overflow:hidden;
      border:1px solid var(--border-glow);
      background:rgba(15,20,45,0.6);
      backdrop-filter:blur(8px);
    }
    .feature-img img{width:100%;display:block}
    @media(max-width:1024px){
      .feature-row,.feature-row.reverse{flex-direction:column}
    }
    /* 场景卡片不等大 */
    .scene-grid{display:grid;grid-template-columns:1.2fr 1fr 0.9fr;gap:24px}
    .scene-card{
      background:var(--card-bg);backdrop-filter:blur(16px);
      border:1px solid var(--border-glow);border-radius:var(--radius-card);
      padding:32px;transition:0.3s;
    }
    .scene-card:hover{border-color:rgba(0,240,255,0.4);box-shadow:var(--shadow-hover)}
    @media(max-width:1024px){.scene-grid{grid-template-columns:1fr}}
    /* 案例数据墙 */
    .case-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:28px}
    .case-card{
      background:var(--card-bg);backdrop-filter:blur(16px);
      border:1px solid var(--border-glow);border-radius:var(--radius-card);
      padding:28px;display:flex;gap:24px;align-items:center;
    }
    .case-number{font-size:42px;font-weight:700;color:var(--accent-cyan);min-width:90px}
    .case-detail h3{margin-bottom:6px}
    @media(max-width:768px){.case-grid{grid-template-columns:1fr}.case-card{flex-direction:column}}
    /* 价格流程 */
    .steps{display:flex;gap:24px;justify-content:center;flex-wrap:wrap}
    .step{
      flex:1;min-width:220px;background:var(--card-bg);
      backdrop-filter:blur(16px);border:1px solid var(--border-glow);
      border-radius:var(--radius-card);padding:28px;text-align:center;
    }
    .step-number{font-size:32px;font-weight:700;color:var(--accent-purple);margin-bottom:12px}
    /* FAQ */
    .accordion-item{border-bottom:1px solid rgba(0,240,255,0.1);padding:16px 0}
    .accordion-question{
      font-size:18px;color:var(--text-white);cursor:pointer;
      display:flex;align-items:center;gap:12px;font-weight:500;
    }
    .accordion-question::before{content:'•';color:var(--accent-cyan);font-size:24px}
    .accordion-answer{max-height:0;overflow:hidden;transition:max-height 0.4s ease;color:var(--text-body);padding-left:28px}
    .accordion-item.active .accordion-answer{max-height:200px;padding-top:12px}
    .accordion-item.active .accordion-question{color:var(--accent-cyan)}
    /* CTA横幅 */
    .cta-banner{
      background:linear-gradient(135deg, rgba(0,240,255,0.08) 0%, rgba(123,47,255,0.08) 100%);
      border:1px solid var(--border-glow);border-radius:var(--radius-card);
      padding:60px 40px;text-align:center;
    }
    .input-group{display:flex;max-width:500px;margin:20px auto 0;gap:12px}
    .input-group input{
      flex:1;background:rgba(10,14,39,0.8);border:1px solid rgba(0,240,255,0.3);
      border-radius:6px;padding:12px 16px;color:white;outline:none;
    }
    .input-group input:focus{border-color:var(--accent-cyan);box-shadow:0 0 10px rgba(0,240,255,0.3)}
    @media(max-width:500px){.input-group{flex-direction:column}}
    /* Footer */
    .site-footer{
      background:#080C20;padding:60px 0 30px;
      border-top:1px solid rgba(255,255,255,0.05);
    }
    .footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:40px}
    .footer-col h4{color:white;margin-bottom:16px;font-size:16px}
    .footer-col a,.footer-col p{font-size:13px;color:var(--text-muted);display:block;margin-bottom:8px}
    .footer-col a:hover{color:var(--accent-cyan)}
    .footer-bottom{border-top:1px solid rgba(255,255,255,0.05);margin-top:40px;padding-top:20px;text-align:center;font-size:13px;color:var(--text-muted)}
    @media(max-width:768px){.footer-grid{grid-template-columns:1fr 1fr}}