/* roulang page: index */
:root {
      --primary-deep: #0B1D3A;
      --primary-bg: #051225;
      --accent-cyan: #00E5FF;
      --warm-gold: #FFB74D;
      --glass-bg: rgba(15, 30, 60, 0.7);
      --glass-border: rgba(255, 255, 255, 0.08);
      --text-main: #FFFFFF;
      --text-body: #B0C7E0;
      --text-muted: #6A84A0;
      --radius-card: 20px;
      --radius-btn: 40px;
      --radius-img: 24px;
      --transition-smooth: 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
      --shadow-glass: 0 8px 32px rgba(0, 0, 0, 0.4);
      --font-title: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --font-data: 'Inter', 'SF Pro Display', sans-serif;
    }

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

    body {
      background: radial-gradient(circle at 20% 10%, #0B1D3A 0%, #051225 90%);
      background-attachment: fixed;
      color: var(--text-body);
      font-family: var(--font-body);
      font-weight: 400;
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
      min-height: 100vh;
      position: relative;
    }

    body::before {
      content: "";
      position: fixed;
      inset: 0;
      background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="60" height="60" viewBox="0 0 60 60"><path d="M30 0L60 30L30 60L0 30Z" fill="none" stroke="rgba(255,255,255,0.02)" stroke-width="1"/></svg>');
      background-size: 80px 80px;
      pointer-events: none;
      z-index: 0;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 20px;
      position: relative;
      z-index: 1;
    }

    /* 悬浮胶囊导航 */
    .nav-capsule {
      position: fixed;
      top: 20px;
      left: 50%;
      transform: translateX(-50%);
      width: fit-content;
      max-width: 90%;
      background: rgba(11, 29, 58, 0.8);
      backdrop-filter: blur(30px);
      -webkit-backdrop-filter: blur(30px);
      border: 1px solid rgba(255, 255, 255, 0.12);
      border-radius: 60px;
      padding: 8px 28px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 32px;
      z-index: 999;
      box-shadow: 0 12px 30px rgba(0,0,0,0.5);
      transition: all 0.3s;
    }

    .nav-logo {
      font-family: var(--font-title);
      font-weight: 700;
      font-size: 20px;
      color: #FFFFFF;
      letter-spacing: 0.5px;
      white-space: nowrap;
      text-decoration: none;
    }

    .nav-links {
      display: flex;
      gap: 24px;
      align-items: center;
    }

    .nav-links a {
      color: var(--text-body);
      text-decoration: none;
      font-weight: 500;
      font-size: 15px;
      transition: color 0.2s;
      position: relative;
      padding-bottom: 4px;
      white-space: nowrap;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 50%;
      transform: translateX(-50%);
      width: 0;
      height: 2px;
      background: var(--accent-cyan);
      box-shadow: 0 0 8px var(--accent-cyan);
      transition: width 0.25s;
    }

    .nav-links a:hover {
      color: var(--accent-cyan);
    }
    .nav-links a:hover::after {
      width: 70%;
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
      padding: 5px;
    }
    .hamburger span {
      width: 22px;
      height: 2px;
      background: var(--text-body);
      border-radius: 2px;
      transition: 0.2s;
    }

    /* 板块间距 */
    section {
      padding: 100px 0;
      position: relative;
      z-index: 1;
    }

    h1, h2, h3 {
      font-family: var(--font-title);
      color: var(--text-main);
    }
    h1 { font-size: 48px; line-height: 1.25; font-weight: 700; }
    h2 { font-size: 36px; line-height: 1.3; font-weight: 600; }
    h3 { font-size: 24px; line-height: 1.4; font-weight: 500; }

    .section-subtitle {
      color: var(--text-body);
      font-size: 18px;
      margin-top: 15px;
      max-width: 700px;
      margin-left: auto;
      margin-right: auto;
    }

    /* 玻璃卡片 */
    .glass-card {
      background: rgba(255,255,255,0.03);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-glass);
      transition: var(--transition-smooth);
      padding: 32px;
      height: 100%;
      display: flex;
      flex-direction: column;
    }

    .glass-card:hover {
      background: rgba(255,255,255,0.06);
      border-color: rgba(0,229,255,0.25);
      transform: translateY(-4px);
      box-shadow: 0 16px 40px rgba(0,0,0,0.5);
    }

    /* 发光按钮 */
    .btn-glow {
      background: var(--accent-cyan);
      color: #0B1D3A;
      font-weight: 600;
      font-size: 16px;
      padding: 14px 32px;
      border-radius: 40px;
      border: none;
      cursor: pointer;
      box-shadow: 0 0 20px rgba(0,229,255,0.5), inset 0 1px 0 rgba(255,255,255,0.2);
      transition: all 0.3s;
      display: inline-block;
      text-decoration: none;
      text-align: center;
      font-family: var(--font-body);
      letter-spacing: 0.3px;
    }

    .btn-glow:hover {
      box-shadow: 0 0 30px rgba(0,229,255,0.7);
      background: #33EAFF;
      transform: scale(1.03);
      color: #0B1D3A;
    }

    .btn-outline {
      background: transparent;
      border: 1px solid var(--accent-cyan);
      color: var(--accent-cyan);
      font-weight: 600;
      font-size: 16px;
      padding: 14px 32px;
      border-radius: 40px;
      cursor: pointer;
      transition: 0.3s;
      text-decoration: none;
      display: inline-block;
      text-align: center;
    }
    .btn-outline:hover {
      background: rgba(0,229,255,0.08);
      border-color: #33EAFF;
      color: #33EAFF;
    }

    /* Hero */
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
      min-height: 80vh;
      padding-top: 80px;
    }
    .hero-text {
      flex: 1;
    }
    .hero-visual {
      flex: 1;
      display: flex;
      justify-content: center;
      align-items: center;
    }
    .hero-visual img {
      max-width: 100%;
      border-radius: 32px;
      filter: drop-shadow(0 20px 30px rgba(0,0,0,0.6));
    }

    /* 功能网格 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }
    .feature-main {
      grid-column: span 2;
    }
    .feature-cyan-dot {
      width: 10px;
      height: 10px;
      background: var(--accent-cyan);
      border-radius: 50%;
      box-shadow: 0 0 12px var(--accent-cyan);
      margin-bottom: 20px;
    }
    .number-big {
      font-family: var(--font-data);
      font-size: 42px;
      font-weight: 700;
      color: var(--accent-cyan);
    }

    /* 场景交替 */
    .scenario-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }
    .scenario-row.reverse {
      flex-direction: row-reverse;
    }
    .scenario-img img {
      width: 100%;
      border-radius: var(--radius-img);
      border: 1px solid rgba(255,255,255,0.1);
    }
    .tag {
      background: rgba(0,229,255,0.1);
      color: var(--accent-cyan);
      padding: 4px 16px;
      border-radius: 20px;
      font-size: 13px;
      display: inline-block;
      margin-right: 8px;
      margin-bottom: 8px;
    }

    /* 案例卡片 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }
    .stat-number {
      font-family: var(--font-data);
      font-size: 36px;
      font-weight: 700;
      color: var(--warm-gold);
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.08);
      padding: 20px 0;
      cursor: pointer;
      transition: 0.3s;
    }
    .faq-question {
      display: flex;
      align-items: center;
      gap: 15px;
      font-weight: 600;
      font-size: 20px;
      color: #FFFFFF;
    }
    .faq-indicator {
      width: 4px;
      height: 24px;
      background: var(--accent-cyan);
      border-radius: 4px;
      transition: 0.3s;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-body);
      padding-left: 20px;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
    }
    .faq-item.active .faq-indicator {
      box-shadow: 0 0 12px var(--accent-cyan);
    }

    /* 页脚 */
    footer {
      background: #051225;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }

    @media (max-width: 1024px) {
      h1 { font-size: 40px; }
      .features-grid { grid-template-columns: repeat(2,1fr); }
      .feature-main { grid-column: span 2; }
    }

    @media (max-width: 768px) {
      .nav-capsule {
        justify-content: space-between;
        width: 95%;
        padding: 8px 20px;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 20px;
        right: 20px;
        background: rgba(11,29,58,0.95);
        backdrop-filter: blur(30px);
        flex-direction: column;
        padding: 20px;
        border-radius: 28px;
        gap: 18px;
      }
      .nav-links.active {
        display: flex;
      }
      .hamburger { display: flex; }
      .hero-grid { flex-direction: column; text-align: center; }
      .features-grid { grid-template-columns: 1fr; }
      .feature-main { grid-column: span 1; }
      .scenario-row, .scenario-row.reverse { flex-direction: column; }
      .cases-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      h1 { font-size: 32px; }
    }