/* roulang page: index */
:root {
      --primary: #0A1128;
      --accent-cyan: #00F0FF;
      --accent-red: #FF3366;
      --bg-light: #F5F7FA;
      --bg-dark: #080C1A;
      --text-main: #1A1A2E;
      --text-muted: #5A5A7A;
      --white: #FFFFFF;
      --glass-bg: rgba(255,255,255,0.82);
      --glass-border: rgba(0,240,255,0.18);
      --card-shadow: 0 20px 40px rgba(0,15,40,0.12);
      --button-glow: 0 0 24px rgba(0,240,255,0.5), 0 4px 12px rgba(0,0,0,0.2);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
      --font-number: "Inter", "SF Pro Display", system-ui;
      --radius-card: 16px;
      --radius-btn: 30px;
      --radius-input: 8px;
      --transition: 0.25s ease;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      display: flex;
      flex-direction: column;
      min-height: 100vh;
    }

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

    a {
      text-decoration: none;
      color: inherit;
    }

    button, .btn {
      cursor: pointer;
      font-family: inherit;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }

    /* 导航 */
    .main-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      height: 72px;
      background: transparent;
      transition: background 0.3s, backdrop-filter 0.3s, box-shadow 0.3s;
      border-bottom: 1px solid transparent;
    }

    .main-header.scrolled {
      background: rgba(8,12,26,0.92);
      backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(0,240,255,0.2);
      box-shadow: 0 2px 20px rgba(0,0,0,0.15);
    }

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

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 1.6rem;
      color: var(--white);
      letter-spacing: -0.3px;
    }

    .logo-dot {
      width: 10px;
      height: 10px;
      background: var(--accent-cyan);
      border-radius: 50%;
      display: inline-block;
      box-shadow: 0 0 12px var(--accent-cyan);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }

    .nav-links a {
      color: rgba(255,255,255,0.85);
      font-weight: 500;
      font-size: 0.95rem;
      transition: color 0.2s;
      position: relative;
    }

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

    .btn-primary {
      background: var(--accent-cyan);
      border: none;
      color: var(--primary);
      font-weight: 600;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      box-shadow: var(--button-glow);
      transition: 0.3s;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
    }

    .btn-primary:hover {
      box-shadow: 0 0 32px rgba(0,240,255,0.7), 0 8px 18px rgba(0,0,0,0.3);
      background: var(--accent-red);
      color: white;
    }

    .btn-ghost {
      background: transparent;
      border: 1px solid var(--accent-cyan);
      color: var(--accent-cyan);
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: 0.3s;
    }

    .btn-ghost:hover {
      background: rgba(0,240,255,0.15);
      border-color: var(--accent-red);
      color: var(--accent-red);
    }

    /* 移动端底部导航 */
    .mobile-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 56px;
      background: rgba(8,12,26,0.95);
      backdrop-filter: blur(20px);
      border-top: 1px solid rgba(0,240,255,0.2);
      z-index: 110;
      justify-content: space-around;
      align-items: center;
      padding: 0 8px;
    }

    .mobile-nav a {
      display: flex;
      flex-direction: column;
      align-items: center;
      color: rgba(255,255,255,0.7);
      font-size: 0.7rem;
      gap: 4px;
    }

    .mobile-nav .nav-icon {
      font-size: 1.3rem;
    }

    /* Hero */
    .hero {
      padding: 120px 0 80px;
      background: linear-gradient(135deg, #0A1128 0%, #080C1A 100%);
      display: flex;
      align-items: center;
      min-height: 90vh;
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
    }

    .hero-left {
      flex: 55%;
    }

    .hero-right {
      flex: 45%;
      position: relative;
    }

    .hero h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      color: white;
      letter-spacing: -0.5px;
      margin-bottom: 20px;
    }

    .hero-sub {
      font-size: 1.1rem;
      color: rgba(255,255,255,0.7);
      margin-bottom: 32px;
      max-width: 500px;
    }

    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 30px;
    }

    .trust-badge {
      display: flex;
      align-items: center;
      gap: 12px;
      color: rgba(255,255,255,0.6);
      font-size: 0.8rem;
    }

    .dot-cluster {
      display: flex;
      gap: 5px;
    }

    .dot-cluster span {
      width: 8px;
      height: 8px;
      background: #5A5A7A;
      border-radius: 50%;
    }

    .hero-image {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 24px;
      height: 380px;
      width: 100%;
      border: 2px solid rgba(0,240,255,0.3);
      box-shadow: 0 0 40px rgba(0,240,255,0.2);
      animation: float 4s ease-in-out infinite;
    }

    @keyframes float {
      0% { transform: translateY(0); }
      50% { transform: translateY(-12px); }
      100% { transform: translateY(0); }
    }

    /* 板块标题 */
    .section-title {
      font-size: 36px;
      font-weight: 700;
      margin-bottom: 48px;
      position: relative;
      display: inline-block;
      padding-left: 18px;
      border-left: 5px solid var(--accent-cyan);
    }

    section {
      padding: 80px 0;
    }

    /* 亮点网格 */
    .highlights-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .highlight-card {
      background: var(--glass-bg);
      backdrop-filter: blur(18px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--card-shadow);
      transition: 0.3s;
    }

    .highlight-card:hover {
      transform: translateY(-8px);
      background: rgba(255,255,255,0.9);
      border-color: var(--accent-cyan);
      box-shadow: 0 20px 40px rgba(0,240,255,0.18);
    }

    .highlight-icon {
      font-size: 2rem;
      color: var(--accent-cyan);
      margin-bottom: 16px;
    }

    .highlight-card h3 {
      font-size: 22px;
      font-weight: 600;
      margin-bottom: 8px;
    }

    /* 案例瀑布 */
    .masonry-grid {
      columns: 3;
      column-gap: 24px;
    }

    .case-card {
      break-inside: avoid;
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      margin-bottom: 24px;
      box-shadow: 0 8px 20px rgba(0,0,0,0.05);
      transition: 0.3s;
    }

    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 16px 30px rgba(0,0,0,0.1);
    }

    .case-img {
      height: 180px;
      background-size: cover;
      background-position: center;
    }

    .case-body {
      padding: 20px;
    }

    .case-tag {
      background: var(--accent-red);
      color: white;
      font-size: 0.7rem;
      padding: 4px 10px;
      border-radius: 20px;
      display: inline-block;
      margin-bottom: 8px;
    }

    /* 对比表 */
    .compare-table {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 0;
      background: white;
      border-radius: 12px;
      overflow: hidden;
    }

    .compare-col {
      padding: 32px 24px;
      text-align: center;
      border-right: 1px solid #eee;
    }

    .compare-col:last-child { border-right: none; }
    .compare-col.featured {
      background: #f0fffe;
      border: 2px solid var(--accent-cyan);
      position: relative;
      border-radius: 12px;
    }

    .popular-tag {
      background: var(--accent-red);
      color: white;
      font-size: 0.75rem;
      padding: 6px 14px;
      border-radius: 20px;
      position: absolute;
      top: -12px;
      left: 50%;
      transform: translateX(-50%);
    }

    /* 数据带 */
    .stats-band {
      background: var(--bg-dark);
      padding: 70px 0;
    }

    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }

    .stat-number {
      font-family: var(--font-number);
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--accent-cyan);
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid #ddd;
      padding: 16px 0;
    }

    .faq-question {
      font-weight: 600;
      font-size: 1.1rem;
      cursor: pointer;
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: 0.3s;
      color: var(--text-muted);
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 12px;
    }

    .cta-band {
      background: var(--bg-dark);
      text-align: center;
      padding: 80px 0;
      color: white;
    }

    .footer {
      background: #080C1A;
      color: #ccc;
      padding: 60px 0 20px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }

    @media (max-width: 1024px) {
      .hero-grid { flex-direction: column; }
      .highlights-grid { grid-template-columns: repeat(2,1fr); }
      .masonry-grid { columns: 2; }
      .compare-table { display: block; overflow-x: auto; white-space: nowrap; }
      .stats-grid { grid-template-columns: repeat(2,1fr); }
    }

    @media (max-width: 768px) {
      .main-header .nav-links { display: none; }
      .mobile-nav { display: flex; }
      .hero h1 { font-size: 36px; }
      .highlights-grid { grid-template-columns: 1fr; }
      .masonry-grid { columns: 1; }
      .footer-grid { grid-template-columns: 1fr; }
    }