/* roulang page: index */
:root {
      --brand-red: #E43D2A;
      --deep-space: #1A1A2E;
      --energy-gold: #F0A500;
      --bg-light: #F9F9FB;
      --white: #FFFFFF;
      --text-primary: #1A1A2E;
      --text-secondary: #555555;
      --text-muted: #777777;
      --border-light: #E2E2E8;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.06);
      --shadow-hover: 0 12px 28px rgba(0,0,0,0.12);
      --radius-card: 16px;
      --radius-btn: 30px;
      --radius-input: 8px;
      --transition: 0.3s ease;
      --font-title: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
    }
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: var(--font-body);
      font-size: 16px;
      line-height: 1.7;
      color: var(--text-primary);
      background-color: var(--bg-light);
      -webkit-font-smoothing: antialiased;
    }
    h1, h2, h3, h4 { font-family: var(--font-title); font-weight: 700; }
    a { text-decoration: none; color: inherit; }
    img { max-width: 100%; display: block; }
    .container { max-width: 1200px; margin: 0 auto; padding: 0 15px; }

    /* 导航栏 */
    .site-header {
      position: fixed; top: 0; left: 0; width: 100%; z-index: 99;
      height: 70px; background: transparent; transition: background 0.3s, backdrop-filter 0.3s;
      display: flex; align-items: center;
    }
    .site-header.scrolled {
      background: rgba(26,26,46,0.95); backdrop-filter: blur(10px);
      box-shadow: 0 2px 10px rgba(0,0,0,0.2);
    }
    .header-inner {
      display: flex; align-items: center; justify-content: space-between; width: 100%;
    }
    .logo {
      font-size: 24px; font-weight: 700; color: #fff; letter-spacing: 1px;
      transition: color 0.3s;
    }
    .scrolled .logo { color: #fff; }
    .nav-links { display: flex; gap: 28px; align-items: center; }
    .nav-links a {
      font-size: 15px; font-weight: 400; color: rgba(255,255,255,0.9);
      transition: color 0.2s; padding: 6px 0; border-bottom: 2px solid transparent;
    }
    .nav-links a:hover { color: var(--energy-gold); border-bottom-color: var(--energy-gold); }
    .cta-btn {
      background: linear-gradient(135deg, var(--brand-red), var(--energy-gold));
      color: #fff !important; border: none; padding: 10px 28px; border-radius: var(--radius-btn);
      font-weight: 700; font-size: 16px; transition: all 0.3s; white-space: nowrap;
      box-shadow: 0 4px 12px rgba(228,61,42,0.4);
    }
    .cta-btn:hover {
      background: linear-gradient(135deg, var(--energy-gold), var(--brand-red));
      transform: scale(1.03); color: #fff; box-shadow: 0 6px 18px rgba(240,165,0,0.5);
    }
    .mobile-toggle { display: none; font-size: 24px; color: #fff; cursor: pointer; }
    @media (max-width: 768px) {
      .nav-links { display: none; position: absolute; top: 70px; left:0; width:100%;
        background: rgba(26,26,46,0.98); flex-direction: column; padding: 20px; gap: 18px; }
      .nav-links.show { display: flex; }
      .mobile-toggle { display: block; }
      .header-inner { padding: 0 15px; }
    }

    /* Hero */
    #hero {
      height: 100vh; min-height: 650px; display: flex; align-items: center;
      background: linear-gradient(135deg, #1A1A2E 0%, #3D1C2A 60%, #E43D2A 100%);
      position: relative; overflow: hidden;
    }
    .hero-bg-img {
      position: absolute; top:0; left:0; width:100%; height:100%;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      opacity: 0.25; z-index: 0;
    }
    .hero-content { position: relative; z-index: 2; color: #fff; max-width: 800px; }
    .hero-content h1 {
      font-size: 48px; letter-spacing: -0.5px; margin-bottom: 20px; line-height: 1.3;
      text-shadow: 0 4px 20px rgba(0,0,0,0.3);
    }
    .hero-content .subtitle {
      font-size: 20px; font-weight: 300; margin-bottom: 36px; opacity: 0.9;
    }
    .btn-group { display: flex; gap: 18px; flex-wrap: wrap; }
    .btn-primary {
      background: linear-gradient(135deg, var(--brand-red), var(--energy-gold));
      color: #fff; padding: 14px 36px; border-radius: var(--radius-btn);
      font-weight: 700; font-size: 18px; border: none; transition: 0.3s;
      box-shadow: 0 6px 18px rgba(228,61,42,0.5);
    }
    .btn-primary:hover {
      background: linear-gradient(135deg, var(--energy-gold), var(--brand-red));
      transform: translateY(-2px); color: #fff;
    }
    .btn-secondary {
      background: transparent; border: 2px solid #fff; color: #fff;
      padding: 14px 36px; border-radius: var(--radius-btn); font-weight: 600;
      font-size: 18px; transition: 0.3s;
    }
    .btn-secondary:hover { background: rgba(255,255,255,0.2); transform: translateY(-2px); }
    .scroll-indicator {
      position: absolute; bottom: 30px; left: 50%; transform: translateX(-50%);
      color: #fff; font-size: 30px; animation: bounce 2s infinite; z-index: 2;
    }
    @keyframes bounce { 0%,20%,50%,80%,100%{transform:translateX(-50%) translateY(0);} 40%{transform:translateX(-50%) translateY(-10px);} 60%{transform:translateX(-50%) translateY(-5px);} }
    @media (max-width:768px){
      .hero-content h1{font-size:32px;} .subtitle{font-size:16px;}
      .btn-group .btn-primary, .btn-secondary{padding:12px 24px; font-size:16px;}
    }

    section { padding: 80px 0; }
    .section-title {
      font-size: 36px; font-weight: 700; margin-bottom: 16px; text-align: center;
      color: var(--deep-space);
    }
    .section-desc { text-align: center; color: var(--text-muted); max-width: 700px; margin:0 auto 48px; }

    /* 核心优势 */
    .features-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 30px; }
    .feature-card {
      background: var(--white); border-radius: var(--radius-card);
      padding: 32px 24px; box-shadow: var(--shadow-card); transition: var(--transition);
      text-align: left;
    }
    .feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
    .feature-icon { font-size: 38px; color: var(--brand-red); margin-bottom: 18px; }
    .feature-card h3 { font-size: 22px; margin-bottom: 12px; }
    .feature-card p { color: var(--text-secondary); font-size: 15px; }

    /* 服务矩阵 */
    .services-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 30px; }
    .service-card {
      background: var(--white); border-radius: var(--radius-card); overflow: hidden;
      box-shadow: var(--shadow-card); transition: var(--transition);
    }
    .service-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
    .service-img {
      height: 200px; background-size: cover; background-position: center;
      position: relative;
    }
    .service-img .overlay {
      position: absolute; top:0; left:0; width:100%; height:100%;
      background: linear-gradient(180deg, transparent 40%, rgba(26,26,46,0.7));
    }
    .service-body { padding: 24px; }
    .service-body h3 { font-size: 20px; margin-bottom: 10px; }
    .service-body p { color: var(--text-secondary); font-size: 14px; margin-bottom: 16px; }
    .more-link { color: var(--brand-red); font-weight: 600; font-size: 14px; border-bottom: 1px solid transparent; transition: 0.2s; }
    .more-link:hover { border-bottom: 1px solid var(--brand-red); }

    /* 数据看板 */
    .stats-row {
      display: flex; justify-content: center; flex-wrap: wrap; gap: 30px;
      background: linear-gradient(120deg, #f3f3f8, #ffffff);
      border-radius: 24px; padding: 40px 20px;
    }
    .stat-item {
      min-width: 150px; text-align: center; padding: 20px;
      background: white; border-radius: 20px; box-shadow: var(--shadow-card);
      transition: 0.2s;
    }
    .stat-number { font-size: 42px; font-weight: 800; background: linear-gradient(135deg, var(--brand-red), var(--energy-gold)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
    .stat-label { font-size: 15px; color: var(--text-muted); margin-top: 8px; }

    /* 结果对比 */
    .compare-row { display: flex; align-items: center; gap: 30px; justify-content: center; flex-wrap: wrap; }
    .compare-card {
      flex:1; min-width: 250px; background: #f5f5f5; border-radius: 24px; padding: 32px;
      text-align: center; transition: 0.3s;
    }
    .compare-card.after { background: #FFF5F0; border: 2px solid var(--brand-red); }
    .vs-badge {
      font-size: 28px; font-weight: 800; color: var(--brand-red); background: white;
      width: 60px; height: 60px; display: flex; align-items: center; justify-content: center;
      border-radius: 50%; box-shadow: 0 4px 14px rgba(0,0,0,0.1);
    }

    /* FAQ */
    .faq-list { max-width: 800px; margin: 0 auto; }
    .faq-item {
      background: var(--white); border-radius: 12px; margin-bottom: 12px;
      box-shadow: 0 2px 8px rgba(0,0,0,0.04); transition: 0.2s;
    }
    .faq-question {
      padding: 20px 24px; font-weight: 700; font-size: 18px; cursor: pointer;
      display: flex; align-items: center; gap: 12px; background: transparent;
      border: none; width: 100%; text-align: left; color: var(--deep-space);
    }
    .faq-question i { color: var(--brand-red); font-size: 18px; }
    .faq-answer {
      max-height: 0; overflow: hidden; transition: max-height 0.4s ease;
      background: #FFF9F5; padding: 0 24px; border-radius: 0 0 12px 12px;
    }
    .faq-item.active .faq-answer { max-height: 200px; padding: 16px 24px; }
    .faq-answer p { color: var(--text-secondary); }

    /* CTA */
    #contact {
      background: linear-gradient(135deg, #1A1A2E 0%, #3D1C2A 100%);
      color: #fff; text-align: center;
    }
    .contact-form {
      max-width: 600px; margin: 40px auto 0; display: flex; flex-direction: column; gap: 16px;
    }
    .contact-form input, .contact-form textarea {
      border-radius: var(--radius-input); border: 1px solid #ddd; padding: 14px;
      font-size: 16px; background: #fff; transition: 0.2s;
    }
    .contact-form input:focus, .contact-form textarea:focus {
      border-color: var(--brand-red); box-shadow: 0 0 0 3px rgba(228,61,42,0.2);
      outline: none;
    }
    .submit-btn {
      background: linear-gradient(135deg, var(--brand-red), var(--energy-gold));
      color: #fff; border: none; padding: 14px; border-radius: var(--radius-btn);
      font-weight: 700; font-size: 18px; cursor: pointer; transition: 0.2s;
    }
    .submit-btn:hover { background: linear-gradient(135deg, var(--energy-gold), var(--brand-red)); }

    /* 页脚 */
    .site-footer {
      background: #1A1A2E; color: #ccc; padding: 50px 0 20px;
    }
    .footer-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: 30px; }
    .footer-col h4 { color: #fff; margin-bottom: 18px; font-size: 18px; }
    .footer-col ul { list-style: none; }
    .footer-col li { margin-bottom: 10px; font-size: 14px; }
    .footer-col a { color: #ccc; transition: 0.2s; }
    .footer-col a:hover { color: var(--energy-gold); }
    .copyright {
      border-top: 1px solid rgba(255,255,255,0.2); margin-top: 40px;
      padding-top: 20px; text-align: center; font-size: 14px; color: #aaa;
    }
    @media (max-width: 768px) {
      .features-grid, .services-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .stats-row { flex-direction: column; align-items: center; }
      .compare-row { flex-direction: column; }
    }