/* roulang page: index */
:root {
      --primary: #E94057;
      --primary-dark: #c92d4a;
      --secondary: #1A1A2E;
      --accent: #00D2FF;
      --light-bg: #F8F9FA;
      --white: #FFFFFF;
      --text-dark: #1A1A2E;
      --text-muted: #6C757D;
      --text-light: #F8F9FA;
      --border-light: rgba(0,0,0,0.06);
      --shadow-card: 0 4px 12px rgba(0,0,0,0.06);
      --shadow-hover: 0 8px 24px rgba(0,0,0,0.1);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-nav: 50px;
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
      --transition: 0.2s ease;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--white);
      color: var(--text-dark);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

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

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

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      transition: var(--transition);
    }

    /* 浮动Dock导航 */
    .dock-nav {
      position: fixed;
      top: 20px;
      left: 50%;
      transform: translateX(-50%);
      width: fit-content;
      max-width: 1100px;
      background: rgba(26, 26, 46, 0.88);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-radius: var(--radius-nav);
      padding: 8px 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 32px;
      z-index: 1000;
      box-shadow: 0 4px 20px rgba(0,0,0,0.15);
      transition: background 0.3s, box-shadow 0.3s;
    }

    .dock-nav.scrolled {
      background: rgba(26, 26, 46, 0.95);
      box-shadow: 0 8px 28px rgba(0,0,0,0.25);
    }

    .logo {
      font-weight: 700;
      font-size: 1.4rem;
      color: var(--white);
      letter-spacing: 0.5px;
      white-space: nowrap;
    }
    .logo span {
      color: var(--accent);
    }

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

    .nav-links a {
      color: var(--text-light);
      font-weight: 500;
      font-size: 0.95rem;
      padding: 6px 4px;
      border-bottom: 2px solid transparent;
    }

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

    .btn-nav-cta {
      background: var(--primary);
      color: white;
      padding: 8px 20px;
      border-radius: 30px;
      font-weight: 600;
      font-size: 0.9rem;
      white-space: nowrap;
      box-shadow: 0 2px 8px rgba(233,64,87,0.4);
    }
    .btn-nav-cta:hover {
      background: var(--primary-dark);
      box-shadow: 0 4px 14px rgba(233,64,87,0.6);
    }

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

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

    .section-title {
      font-size: 2rem;
      font-weight: 700;
      margin-bottom: 16px;
      line-height: 1.3;
    }
    .section-sub {
      color: var(--text-muted);
      font-size: 1.1rem;
      margin-bottom: 48px;
    }

    /* Hero */
    #hero {
      background: linear-gradient(135deg, #1A1A2E 0%, #16213E 100%);
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      background-blend-mode: overlay;
      position: relative;
      padding: 140px 0 120px;
      color: white;
    }
    #hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: rgba(26,26,46,0.7);
      backdrop-filter: blur(2px);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      display: flex;
      align-items: center;
      gap: 40px;
      flex-wrap: wrap;
    }
    .hero-text {
      flex: 1 1 400px;
    }
    .hero-text h1 {
      font-size: 3.2rem;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 20px;
      text-shadow: 0 4px 12px rgba(0,0,0,0.4);
    }
    .hero-text p {
      font-size: 1.2rem;
      color: rgba(255,255,255,0.85);
      margin-bottom: 32px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent);
      color: #1A1A2E;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 1rem;
      letter-spacing: 0.3px;
      box-shadow: 0 4px 14px rgba(0,210,255,0.5);
    }
    .btn-primary:hover {
      background: #00b8e6;
      box-shadow: 0 6px 20px rgba(0,210,255,0.7);
      transform: translateY(-1px);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid white;
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
    }
    .btn-outline:hover {
      background: rgba(255,255,255,0.1);
    }

    /* Features 三列卡片左侧色条 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .feature-card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 28px 24px;
      box-shadow: var(--shadow-card);
      display: flex;
      align-items: flex-start;
      gap: 18px;
      border-left: 5px solid var(--primary);
      transition: all 0.25s;
    }
    .feature-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-3px);
      border-left-color: var(--accent);
    }
    .feature-icon {
      font-size: 2.4rem;
      line-height: 1;
      color: var(--primary);
    }
    .feature-text h3 {
      font-size: 1.4rem;
      margin-bottom: 8px;
      font-weight: 650;
    }
    .feature-text p {
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* Scenarios 左右交替 */
    .scenario-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
      flex-wrap: wrap;
    }
    .scenario-row.reverse {
      flex-direction: row-reverse;
    }
    .scenario-img {
      flex: 1 1 280px;
    }
    .scenario-img img {
      border-radius: 16px;
      box-shadow: 0 8px 24px rgba(0,0,0,0.1);
    }
    .scenario-text {
      flex: 1 1 300px;
    }
    .scenario-text h3 {
      font-size: 1.8rem;
      margin-bottom: 16px;
    }
    .scenario-text p {
      color: var(--text-muted);
      font-size: 1.05rem;
    }

    /* Cases 数据卡 */
    .cases-bg {
      background: var(--secondary);
      color: white;
    }
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .case-card {
      background: rgba(255,255,255,0.05);
      backdrop-filter: blur(10px);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      text-align: center;
    }
    .case-number {
      font-size: 2.8rem;
      font-weight: 800;
      color: var(--accent);
    }
    .case-label {
      font-size: 1.1rem;
      margin: 8px 0 16px;
    }
    .case-quote {
      font-style: italic;
      color: rgba(255,255,255,0.7);
    }

    /* Pricing */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
      align-items: start;
    }
    .pricing-card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 36px 24px;
      box-shadow: var(--shadow-card);
      text-align: center;
      transition: 0.2s;
    }
    .pricing-card.featured {
      border: 2px solid var(--primary);
      box-shadow: 0 12px 28px rgba(233,64,87,0.15);
      transform: scale(1.02);
    }
    .price {
      font-size: 2.5rem;
      font-weight: 800;
      color: var(--primary);
    }
    .btn-price {
      background: var(--primary);
      color: white;
      padding: 12px 28px;
      border-radius: 30px;
      font-weight: 600;
      margin-top: 20px;
    }

    /* FAQ */
    .faq-list {
      display: flex;
      flex-direction: column;
      gap: 16px;
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      background: var(--light-bg);
      border-radius: 8px;
      padding: 16px;
      cursor: pointer;
    }
    .faq-question {
      font-weight: 700;
      display: flex;
      justify-content: space-between;
    }
    .faq-answer {
      margin-top: 12px;
      color: var(--text-muted);
      display: none;
      border-left: 3px solid var(--primary);
      padding-left: 16px;
    }
    .faq-item.open .faq-answer {
      display: block;
    }

    /* Footer */
    .footer {
      background: var(--secondary);
      color: var(--text-light);
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }
    .footer a:hover {
      color: var(--accent);
    }

    @media (max-width: 768px) {
      .dock-nav {
        width: 95%;
        padding: 8px 16px;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 20px;
        right: 20px;
        background: rgba(26,26,46,0.95);
        flex-direction: column;
        padding: 20px;
        border-radius: 20px;
      }
      .nav-links.open {
        display: flex;
      }
      .hamburger {
        display: flex;
      }
      .features-grid, .cases-grid, .pricing-grid {
        grid-template-columns: 1fr;
      }
      .scenario-row {
        flex-direction: column;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .hero-text h1 {
        font-size: 2.2rem;
      }
    }