/* roulang page: index */
:root {
      --color-primary: #00C9A7;
      --color-primary-dark: #00A88D;
      --color-primary-light: #E6FFF9;
      --color-secondary: #1A1A2E;
      --color-bg: #F8F7F4;
      --color-white: #FFFFFF;
      --color-accent: #FFD166;
      --color-text: #2D2D2D;
      --color-text-muted: #6B7280;
      --border-radius-sm: 8px;
      --border-radius-md: 16px;
      --border-radius-lg: 24px;
      --border-radius-btn: 50px;
      --shadow-sm: 0 4px 12px rgba(0,0,0,0.03);
      --shadow-md: 0 12px 28px rgba(0,0,0,0.06);
      --shadow-xl: 0 24px 48px rgba(0,0,0,0.08);
      --transition: 0.3s ease;
      --max-width: 1280px;
      --section-gap: 100px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: 'Noto Sans SC', sans-serif;
      background: var(--color-bg);
      color: var(--color-text);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    h1, h2, h3, .nav-links a, .btn {
      font-family: 'Inter', 'Noto Sans SC', sans-serif;
      font-weight: 700;
      letter-spacing: -0.3px;
    }
    h1 {
      font-size: 3.5rem;
      line-height: 1.2;
      font-weight: 800;
    }
    h2 {
      font-size: 2.4rem;
      line-height: 1.3;
      margin-bottom: 1rem;
    }
    h3 {
      font-size: 1.35rem;
      line-height: 1.4;
      margin-bottom: 0.6rem;
    }
    p {
      color: var(--color-text-muted);
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 32px;
    }
    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 80px;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(16px);
      z-index: 1000;
      transition: box-shadow var(--transition);
      display: flex;
      align-items: center;
      border-bottom: 1px solid rgba(0,0,0,0.02);
    }
    .navbar.scrolled {
      box-shadow: 0 8px 24px rgba(0,0,0,0.04);
    }
    .navbar .container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo {
      font-size: 1.6rem;
      font-weight: 800;
      color: var(--color-secondary);
      text-decoration: none;
      display: flex;
      align-items: center;
      gap: 0.5rem;
      letter-spacing: -0.5px;
    }
    .logo-icon {
      font-size: 1.9rem;
      color: var(--color-primary);
    }
    .nav-links {
      display: flex;
      gap: 2.5rem;
      align-items: center;
      list-style: none;
    }
    .nav-links a {
      text-decoration: none;
      color: var(--color-secondary);
      font-weight: 600;
      font-size: 0.95rem;
      transition: color 0.2s;
    }
    .nav-links a:hover {
      color: var(--color-primary);
    }
    .btn {
      padding: 0.75rem 2rem;
      border-radius: var(--border-radius-btn);
      font-weight: 700;
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      transition: background var(--transition), transform 0.2s, box-shadow var(--transition);
      border: none;
      cursor: pointer;
      background: var(--color-primary);
      color: white;
      font-size: 0.9rem;
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--color-primary);
      color: var(--color-primary);
    }
    .btn-outline:hover {
      background: var(--color-primary-light);
    }
    .btn:hover {
      background: var(--color-primary-dark);
      transform: translateY(-2px);
      box-shadow: var(--shadow-md);
    }
    .btn-large {
      padding: 1rem 2.6rem;
      font-size: 1rem;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
    }
    .hamburger span {
      width: 25px;
      height: 3px;
      background: var(--color-secondary);
      transition: 0.3s;
      border-radius: 3px;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 80px;
      left: 0;
      width: 100%;
      height: calc(100vh - 80px);
      background: var(--color-bg);
      flex-direction: column;
      justify-content: center;
      align-items: center;
      gap: 2.2rem;
      z-index: 999;
      transition: all 0.4s;
    }
    .mobile-menu a {
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--color-secondary);
      text-decoration: none;
    }
    /* Hero */
    .hero {
      background: linear-gradient(135deg, #1A1A2E 0%, #16213E 100%);
      color: white;
      min-height: 90vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
      padding-top: 80px;
    }
    .hero::before {
      content: '';
      position: absolute;
      right: 0;
      top: 0;
      width: 50%;
      height: 100%;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      opacity: 0.16;
      mask-image: linear-gradient(to left, black, transparent);
    }
    .hero-content {
      display: flex;
      align-items: center;
      gap: 40px;
      position: relative;
      z-index: 1;
    }
    .hero-text {
      flex: 1;
    }
    .hero-text h1 {
      color: white;
      margin-bottom: 1.5rem;
    }
    .hero-text p {
      font-size: 1.2rem;
      color: rgba(255,255,255,0.8);
      margin-bottom: 2.5rem;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-visual {
      flex: 1;
      background: rgba(255,255,255,0.06);
      border-radius: 32px;
      padding: 20px;
      backdrop-filter: blur(8px);
    }
    /* 板块通用 */
    section {
      padding: var(--section-gap) 0;
    }
    .section-title {
      text-align: center;
      margin-bottom: 3.5rem;
    }
    .section-title h2 {
      color: var(--color-secondary);
    }
    .section-title p {
      font-size: 1.1rem;
    }
    /* 功能卡片 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 32px;
    }
    .feature-card {
      background: var(--color-white);
      border-radius: var(--border-radius-md);
      padding: 40px 28px;
      box-shadow: 0 8px 28px rgba(0,0,0,0.03);
      transition: all 0.25s;
      border: 1px solid rgba(0,0,0,0.02);
      display: flex;
      flex-direction: column;
    }
    .feature-card:hover {
      transform: translateY(-8px);
      box-shadow: 0 20px 40px rgba(0,0,0,0.06);
    }
    .feature-icon {
      font-size: 2.6rem;
      margin-bottom: 24px;
      color: var(--color-primary);
    }
    /* 场景交错 */
    .scenario-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 120px;
    }
    .scenario-row.reverse {
      flex-direction: row-reverse;
    }
    .scenario-img {
      flex: 1;
      border-radius: 24px;
      overflow: hidden;
    }
    .scenario-img img {
      width: 100%;
      display: block;
    }
    .scenario-text {
      flex: 1;
    }
    /* 案例画廊 */
    .cases-scroll {
      display: flex;
      overflow-x: auto;
      gap: 24px;
      padding-bottom: 20px;
      scroll-snap-type: x mandatory;
    }
    .case-card {
      min-width: 240px;
      background: var(--color-white);
      padding: 24px;
      border-radius: 20px;
      border-left: 6px solid var(--color-primary);
      box-shadow: 0 6px 18px rgba(0,0,0,0.02);
      scroll-snap-align: start;
      flex-shrink: 0;
    }
    /* 价格 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 28px;
    }
    .price-card {
      background: white;
      border-radius: 28px;
      padding: 36px 24px;
      box-shadow: 0 12px 32px rgba(0,0,0,0.02);
      transition: all 0.25s;
      border: 2px solid transparent;
      text-align: center;
    }
    .price-card.popular {
      border-color: var(--color-primary);
      transform: scale(1.02);
    }
    .price-amount {
      font-size: 3rem;
      font-weight: 800;
      color: var(--color-accent);
      margin: 1.2rem 0;
    }
    /* FAQ */
    .faq-item {
      background: white;
      border-radius: 20px;
      margin-bottom: 16px;
      transition: all 0.3s;
    }
    .faq-question {
      padding: 24px;
      font-weight: 700;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }
    .faq-answer {
      padding: 0 24px 20px;
      display: none;
      color: var(--color-text-muted);
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    .cta-banner {
      background: var(--color-primary);
      border-radius: 36px;
      padding: 70px;
      text-align: center;
      color: white;
    }
    footer {
      background: var(--color-secondary);
      color: rgba(255,255,255,0.9);
      padding: 60px 0 30px;
    }
    @media (max-width: 1024px) {
      h1 { font-size: 2.5rem; }
      .grid-3, .pricing-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .hero-content { flex-direction: column; }
      .grid-3, .pricing-grid { grid-template-columns: 1fr; }
      .scenario-row, .scenario-row.reverse { flex-direction: column; }
    }