/* roulang page: index */
:root {
      --primary-bg: #0A0E27;
      --accent-cyan: #00E5FF;
      --accent-orange: #FF6B35;
      --glass-bg: rgba(255, 255, 255, 0.04);
      --glass-border: rgba(255, 255, 255, 0.1);
      --text-primary: #E0E0E0;
      --text-secondary: #8892A4;
      --radius-lg: 16px;
      --radius-md: 12px;
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --font-heading: 'Inter', 'Noto Sans SC', system-ui, sans-serif;
      --font-body: 'Inter', 'Noto Sans SC', system-ui, sans-serif;
      --btn-glow-orange: 0 0 18px rgba(255, 107, 53, 0.5);
      --btn-glow-cyan: 0 0 14px rgba(0, 229, 255, 0.3);
      --glass-blur: blur(20px);
    }

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

    body {
      background-color: var(--primary-bg);
      color: var(--text-primary);
      font-family: var(--font-body);
      font-size: 16px;
      font-weight: 400;
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
      overflow-x: hidden;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    h1, h2, h3 {
      font-family: var(--font-heading);
      color: white;
    }

    h1 {
      font-size: 48px;
      font-weight: 800;
      line-height: 1.2;
      letter-spacing: -0.5px;
    }

    h2 {
      font-size: 36px;
      font-weight: 700;
      line-height: 1.3;
      margin-bottom: 16px;
    }

    h3 {
      font-size: 22px;
      font-weight: 600;
      line-height: 1.4;
    }

    p {
      color: var(--text-primary);
      margin-bottom: 1em;
    }

    a {
      color: var(--accent-cyan);
      text-decoration: none;
      transition: color 0.2s;
    }

    a:hover {
      color: var(--accent-orange);
    }

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

    button, .btn {
      cursor: pointer;
      font-family: var(--font-body);
      font-weight: 600;
      font-size: 16px;
      border: none;
      border-radius: var(--radius-md);
      padding: 14px 32px;
      transition: all 0.25s ease;
    }

    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(10, 14, 39, 0.85);
      backdrop-filter: var(--glass-blur);
      -webkit-backdrop-filter: var(--glass-blur);
      border-bottom: 1px solid rgba(0, 229, 255, 0.15);
      transition: background 0.3s, box-shadow 0.3s;
    }

    .navbar.scrolled {
      background: rgba(10, 14, 39, 0.95);
      box-shadow: 0 4px 20px rgba(0, 229, 255, 0.15);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
      padding: 0 24px;
      max-width: 1200px;
      margin: 0 auto;
    }

    .logo {
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 24px;
      color: white;
      letter-spacing: 1px;
      display: flex;
      align-items: center;
    }

    .logo span {
      color: var(--accent-cyan);
      margin-right: 4px;
    }

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

    .nav-links a {
      color: var(--text-secondary);
      font-weight: 500;
      font-size: 15px;
      position: relative;
      padding: 8px 0;
    }

    .nav-links a:hover {
      color: white;
    }

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

    .nav-links a:hover::after {
      width: 100%;
    }

    .btn-primary-nav {
      background: var(--accent-orange);
      color: white;
      padding: 10px 24px;
      border-radius: 30px;
      font-weight: 600;
      box-shadow: var(--btn-glow-orange);
      border: none;
    }

    .btn-primary-nav:hover {
      background: #FF8255;
      box-shadow: 0 0 28px rgba(255, 107, 53, 0.7);
      transform: scale(1.03);
    }

    .mobile-bottom-nav {
      display: none;
    }

    /* Hero */
    .hero {
      padding: 140px 0 100px;
      display: flex;
      align-items: center;
      min-height: 90vh;
      background: radial-gradient(circle at 20% 20%, rgba(0,229,255,0.08) 0%, transparent 50%);
      position: relative;
      overflow: hidden;
    }

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

    .hero-content {
      flex: 1 1 55%;
    }

    .hero-image {
      flex: 1 1 45%;
      position: relative;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: 0 0 30px rgba(0,229,255,0.2);
      border: 1px solid rgba(0,229,255,0.25);
      backdrop-filter: blur(4px);
    }

    .hero-image img {
      width: 100%;
      height: auto;
      aspect-ratio: 4/3;
      object-fit: cover;
    }

    .hero h1 {
      margin-bottom: 20px;
    }

    .hero-sub {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 32px;
      max-width: 500px;
    }

    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 40px;
    }

    .btn-primary {
      background: var(--accent-orange);
      color: white;
      box-shadow: var(--btn-glow-orange);
    }

    .btn-primary:hover {
      background: #FF8255;
      box-shadow: 0 0 28px rgba(255,107,53,0.7);
      transform: scale(1.03);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--accent-cyan);
      color: var(--accent-cyan);
      box-shadow: none;
    }

    .btn-outline:hover {
      background: rgba(0,229,255,0.08);
      box-shadow: var(--btn-glow-cyan);
    }

    .hero-stats {
      display: flex;
      gap: 32px;
      flex-wrap: wrap;
    }

    .stat-item h3 {
      font-size: 28px;
      color: var(--accent-orange);
      font-weight: 700;
    }

    .stat-item p {
      color: var(--text-secondary);
      font-size: 14px;
    }

    /* 区块通用 */
    section {
      padding: 100px 0;
    }

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

    /* 价值主张 非对称 */
    .value-grid {
      display: flex;
      gap: 60px;
      align-items: flex-start;
    }

    .value-left {
      flex: 1;
    }

    .value-right {
      flex: 1.2;
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }

    .glass-card {
      background: rgba(10,14,39,0.6);
      backdrop-filter: var(--glass-blur);
      -webkit-backdrop-filter: var(--glass-blur);
      border: 1px solid rgba(0,229,255,0.15);
      border-radius: var(--radius-lg);
      padding: 28px;
      box-shadow: var(--shadow-card);
      transition: all 0.3s;
      position: relative;
    }

    .glass-card:hover {
      box-shadow: 0 0 20px rgba(0,229,255,0.25);
      border-color: rgba(0,229,255,0.4);
    }

    .value-card-lg {
      grid-column: span 1;
      padding: 32px;
    }

    .icon-cyan {
      color: var(--accent-cyan);
      font-size: 28px;
      margin-bottom: 16px;
    }

    /* 功能Tab */
    .tab-nav {
      display: flex;
      gap: 24px;
      border-bottom: 1px solid rgba(255,255,255,0.1);
      margin-bottom: 40px;
      flex-wrap: wrap;
    }

    .tab-btn {
      background: none;
      border: none;
      color: var(--text-secondary);
      font-weight: 600;
      padding: 12px 4px;
      font-size: 16px;
      position: relative;
      cursor: pointer;
    }

    .tab-btn.active {
      color: white;
    }

    .tab-btn.active::after {
      content: '';
      position: absolute;
      bottom: -1px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--accent-cyan);
    }

    .tab-content {
      display: none;
    }

    .tab-content.active {
      display: flex;
      gap: 40px;
      align-items: center;
    }

    .feature-img {
      flex: 1;
      border-radius: var(--radius-md);
      overflow: hidden;
    }

    .feature-img img {
      aspect-ratio: 16/9;
      width: 100%;
    }

    /* 场景横向滚动 */
    .scenario-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      scroll-snap-type: x mandatory;
      padding-bottom: 20px;
      -ms-overflow-style: none;
      scrollbar-width: none;
    }

    .scenario-scroll::-webkit-scrollbar {
      display: none;
    }

    .scenario-card {
      flex: 0 0 280px;
      scroll-snap-align: start;
      background: rgba(10,14,39,0.6);
      backdrop-filter: blur(20px);
      border: 1px solid rgba(255,255,255,0.1);
      border-radius: var(--radius-lg);
      overflow: hidden;
      transition: all 0.3s;
    }

    .scenario-card:hover {
      transform: translateY(-8px);
      border-color: var(--accent-cyan);
      box-shadow: 0 0 18px rgba(0,229,255,0.3);
    }

    .scenario-img {
      height: 160px;
    }

    .scenario-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .scenario-text {
      padding: 20px;
    }

    /* 案例 */
    .cases-grid {
      display: flex;
      gap: 48px;
    }

    .case-numbers {
      flex: 1;
      display: flex;
      flex-direction: column;
      gap: 32px;
    }

    .case-cards {
      flex: 1.5;
      display: flex;
      flex-direction: column;
      gap: 24px;
    }

    .case-card {
      border-left: 3px solid var(--accent-cyan);
      padding-left: 20px;
    }

    /* 价格 */
    .pricing-row {
      display: flex;
      gap: 24px;
      align-items: flex-start;
      justify-content: center;
      flex-wrap: wrap;
    }

    .price-card {
      flex: 1 1 280px;
      max-width: 340px;
      background: rgba(10,14,39,0.6);
      backdrop-filter: blur(20px);
      border: 1px solid rgba(255,255,255,0.1);
      border-radius: var(--radius-lg);
      padding: 32px;
      text-align: center;
    }

    .price-card.recommended {
      border: 2px solid var(--accent-cyan);
      position: relative;
      box-shadow: 0 0 24px rgba(0,229,255,0.15);
    }

    .badge {
      background: var(--accent-orange);
      color: white;
      font-size: 13px;
      padding: 4px 12px;
      border-radius: 20px;
      position: absolute;
      top: -12px;
      left: 50%;
      transform: translateX(-50%);
    }

    .price-amount {
      font-size: 40px;
      font-weight: 800;
      color: var(--accent-orange);
      margin: 16px 0;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }

    .faq-item {
      background: rgba(10,14,39,0.6);
      backdrop-filter: blur(20px);
      border: 1px solid rgba(255,255,255,0.1);
      border-radius: var(--radius-md);
      margin-bottom: 12px;
      padding: 0 20px;
      transition: 0.2s;
    }

    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 18px 0;
      font-weight: 600;
      cursor: pointer;
    }

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

    .faq-item.open .faq-answer {
      max-height: 150px;
      padding-bottom: 16px;
    }

    .faq-item.open {
      border-color: var(--accent-cyan);
    }

    /* CTA */
    .cta-section {
      background: radial-gradient(circle at center, rgba(0,229,255,0.12) 0%, transparent 70%);
      text-align: center;
    }

    .input-group {
      display: flex;
      max-width: 480px;
      margin: 24px auto;
      gap: 12px;
    }

    .input-glass {
      background: rgba(255,255,255,0.05);
      border: 1px solid rgba(255,255,255,0.2);
      border-radius: var(--radius-md);
      padding: 14px;
      color: white;
      flex: 1;
    }

    .input-glass:focus {
      outline: none;
      border-color: var(--accent-cyan);
      box-shadow: 0 0 10px rgba(0,229,255,0.3);
    }

    footer {
      padding: 60px 0 30px;
      border-top: 1px solid rgba(255,255,255,0.1);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }

    @media (max-width: 1024px) {
      h1 { font-size: 40px; }
      .hero-grid { flex-direction: column; }
      .value-grid { flex-direction: column; }
      .cases-grid { flex-direction: column; }
    }

    @media (max-width: 767px) {
      .navbar .nav-links { display: none; }
      .mobile-bottom-nav {
        display: flex;
        position: fixed;
        bottom: 0;
        left: 0;
        width: 100%;
        background: rgba(10,14,39,0.95);
        backdrop-filter: blur(20px);
        justify-content: space-around;
        padding: 10px 0;
        border-top: 1px solid rgba(0,229,255,0.2);
        z-index: 999;
      }
      .mobile-bottom-nav a {
        color: var(--text-secondary);
        font-size: 12px;
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 4px;
      }
      .mobile-bottom-nav .btn-capsule {
        background: var(--accent-orange);
        color: white;
        padding: 10px 24px;
        border-radius: 30px;
        box-shadow: var(--btn-glow-orange);
      }
      h1 { font-size: 32px; }
      h2 { font-size: 26px; }
      section { padding: 64px 0; }
      .tab-content.active { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr; }
    }