/* roulang page: index */
:root {
      --primary: #E53935;
      --primary-dark: #C62828;
      --secondary: #1B1B2F;
      --accent: #FFB300;
      --accent-dark: #FFA000;
      --bg-light: #F5F5F5;
      --white: #FFFFFF;
      --text-main: #1B1B2F;
      --text-muted: #5C5C6E;
      --text-on-dark: #FFFFFF;
      --border-light: rgba(27, 27, 47, 0.08);
      --shadow-card: 0 8px 30px rgba(27, 27, 47, 0.06);
      --shadow-hover: 0 12px 32px rgba(27, 27, 47, 0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --font-title: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --font-data: 'DIN Alternate', 'Roboto', 'PingFang SC', sans-serif;
      --transition: 0.3s ease;
      --section-gap: 80px;
    }

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

    body {
      font-family: var(--font-body);
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.8;
      font-size: 16px;
      -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;
    }

    button, .btn {
      cursor: pointer;
      font-family: var(--font-body);
      border: none;
      background: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      transition: var(--transition);
      font-weight: 600;
    }

    h1, h2, h3 {
      font-family: var(--font-title);
    }

    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      padding: 20px 0;
      transition: background 0.3s ease, padding 0.3s ease, box-shadow 0.3s ease;
      background: transparent;
      backdrop-filter: blur(0px);
    }

    .navbar.scrolled {
      background: rgba(27, 27, 47, 0.96);
      backdrop-filter: blur(12px);
      padding: 12px 0;
      box-shadow: 0 4px 20px rgba(0,0,0,0.2);
      border-bottom: 1px solid var(--primary);
    }

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

    .logo {
      font-family: var(--font-title);
      font-weight: 700;
      font-size: 24px;
      color: white;
      display: flex;
      align-items: center;
      gap: 6px;
      letter-spacing: 0.5px;
      transition: color 0.2s;
    }
    .logo i {
      color: var(--accent);
      font-size: 28px;
    }

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

    .nav-links a {
      color: rgba(255,255,255,0.9);
      font-weight: 500;
      font-size: 15px;
      position: relative;
      padding: 4px 0;
      transition: color 0.2s;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent);
      transition: width 0.25s ease;
    }

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

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      cursor: pointer;
      z-index: 1001;
    }
    .hamburger span {
      width: 25px;
      height: 2px;
      background: white;
      transition: 0.3s;
      display: block;
    }

    .mobile-menu {
      position: fixed;
      top: 0;
      right: -100%;
      width: 75%;
      max-width: 320px;
      height: 100vh;
      background: #1B1B2F;
      padding: 100px 30px 30px;
      display: flex;
      flex-direction: column;
      gap: 28px;
      transition: right 0.4s ease;
      z-index: 999;
      box-shadow: -8px 0 30px rgba(0,0,0,0.5);
    }
    .mobile-menu.active {
      right: 0;
    }
    .mobile-menu a {
      color: white;
      font-size: 18px;
      font-weight: 500;
      border-bottom: 1px solid rgba(255,255,255,0.1);
      padding-bottom: 12px;
    }

    /* Hero */
    .hero {
      background: linear-gradient(135deg, #1B1B2F 60%, #E53935 100%);
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
      padding: 100px 0 60px;
      color: white;
    }
    .hero::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.08;
      pointer-events: none;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 48px;
      position: relative;
      z-index: 2;
    }
    .hero-left {
      flex: 1 1 55%;
    }
    .hero-right {
      flex: 1 1 45%;
      display: flex;
      justify-content: center;
    }
    .hero-right img {
      max-height: 420px;
      border-radius: 20px;
      box-shadow: 0 25px 50px rgba(0,0,0,0.5);
      animation: float 5s ease-in-out infinite;
    }
    @keyframes float {
      0% { transform: translateY(0); }
      50% { transform: translateY(-12px); }
      100% { transform: translateY(0); }
    }
    h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 18px;
      opacity: 0.9;
      margin-bottom: 32px;
      max-width: 550px;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 36px;
    }
    .btn-primary {
      background: var(--accent);
      color: #1B1B2F;
      padding: 16px 36px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 16px;
    }
    .btn-primary:hover {
      background: var(--accent-dark);
      transform: scale(1.03);
    }
    .btn-outline {
      border: 2px solid white;
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      background: transparent;
    }
    .btn-outline:hover {
      background: white;
      color: #1B1B2F;
    }
    .hero-stats {
      display: flex;
      gap: 32px;
      font-family: var(--font-data);
    }
    .stat-item h3 {
      font-size: 28px;
      color: var(--accent);
    }
    .stat-item span {
      font-size: 14px;
      opacity: 0.8;
    }

    /* 通用板块 */
    section {
      padding: var(--section-gap) 0;
    }
    .section-title {
      text-align: center;
      margin-bottom: 48px;
    }
    .section-title h2 {
      font-size: 36px;
      font-weight: 600;
      color: var(--secondary);
    }
    .divider {
      width: 60px;
      height: 4px;
      background: linear-gradient(to right, transparent, var(--primary), transparent);
      margin: 12px auto 0;
    }

    /* 功能 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }
    .feature-card {
      background: white;
      padding: 28px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .feature-icon {
      font-size: 32px;
      color: var(--primary);
      margin-bottom: 16px;
    }
    .feature-card h3 {
      font-size: 20px;
      margin-bottom: 10px;
    }

    /* 场景 */
    .scenarios-row {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .scenario-card {
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
    }
    .scenario-card img {
      height: 200px;
      object-fit: cover;
    }
    .scenario-text {
      padding: 20px;
    }

    /* 案例 */
    .cases-bg {
      background: var(--secondary);
      color: white;
    }
    .counters {
      display: flex;
      justify-content: center;
      gap: 60px;
      margin-bottom: 48px;
    }
    .counter {
      text-align: center;
    }
    .counter-number {
      font-family: var(--font-data);
      font-size: 44px;
      color: var(--accent);
    }
    .case-cards {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .case-card {
      background: white;
      color: var(--text-main);
      padding: 24px;
      border-radius: var(--radius-card);
    }

    /* 价格 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .pricing-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 32px;
      text-align: center;
      border: 1px solid transparent;
      box-shadow: var(--shadow-card);
    }
    .pricing-card.popular {
      border-color: var(--accent);
      position: relative;
    }
    .badge {
      background: var(--accent);
      color: #1B1B2F;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 12px;
      font-weight: 700;
    }
    .price {
      font-family: var(--font-data);
      font-size: 40px;
      color: var(--primary);
      margin: 16px 0;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      background: white;
      border-radius: 12px;
      margin-bottom: 12px;
      box-shadow: 0 2px 10px rgba(0,0,0,0.03);
    }
    .faq-question {
      padding: 20px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }
    .faq-answer {
      padding: 0 24px 20px;
      display: none;
      color: var(--text-muted);
    }
    .faq-item.active .faq-answer {
      display: block;
    }

    /* CTA */
    .cta-band {
      background: var(--primary);
      text-align: center;
      padding: 80px 0;
      color: white;
    }

    /* 页脚 */
    .footer {
      background: var(--secondary);
      color: #B0B0C0;
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
      margin-bottom: 40px;
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .hero-grid { flex-direction: column; }
      h1 { font-size: 36px; }
      .features-grid, .scenarios-row, .case-cards, .pricing-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 480px) {
      .footer-grid { grid-template-columns: 1fr; }
    }