/* roulang page: index */
:root {
      --primary-dark: #0B0E14;
      --accent-red: #E63946;
      --accent-red-hover: #C1121F;
      --highlight-gold: #F4A261;
      --bg-light: #F8F9FA;
      --bg-dark-section: #1A1D24;
      --card-bg: #FFFFFF;
      --text-dark: #0B0E14;
      --text-gray: #4A4E57;
      --text-light: #9CA3AF;
      --border-light: rgba(0,0,0,0.06);
      --shadow-sm: 0 2px 12px rgba(0,0,0,0.06);
      --shadow-hover: 0 8px 28px rgba(0,0,0,0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --font-title: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --font-body: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
      --font-number: 'Inter', 'SF Mono', 'PingFang SC', monospace;
      --container-max: 1280px;
      --transition-smooth: all 0.25s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-body);
      background-color: var(--bg-light);
      color: var(--text-dark);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }
    @media (max-width: 767px) {
      .container {
        padding: 0 16px;
      }
    }
    h1, h2, h3, .nav-logo {
      font-family: var(--font-title);
      font-weight: 700;
    }
    h1 {
      font-size: 48px;
      line-height: 56px;
      letter-spacing: -0.5px;
      font-weight: 800;
    }
    h2 {
      font-size: 36px;
      line-height: 44px;
      font-weight: 700;
      margin-bottom: 16px;
    }
    h3 {
      font-size: 22px;
      line-height: 30px;
      font-weight: 600;
    }
    p {
      font-size: 16px;
      line-height: 26px;
      color: var(--text-gray);
    }
    .section {
      padding: 80px 0;
    }
    @media (max-width: 767px) {
      h1 {
        font-size: 32px;
        line-height: 40px;
      }
      h2 {
        font-size: 28px;
        line-height: 36px;
      }
      .section {
        padding: 48px 0;
      }
    }

    /* 导航 */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(11, 14, 20, 0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      z-index: 1000;
      border-bottom: 1px solid rgba(255,255,255,0.08);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }
    .nav-logo {
      font-size: 24px;
      font-weight: 800;
      color: white;
      display: flex;
      align-items: center;
      gap: 8px;
      text-decoration: none;
      letter-spacing: 1px;
    }
    .nav-logo i {
      color: var(--highlight-gold);
      font-size: 28px;
      transform: rotate(-20deg);
    }
    .nav-links {
      display: flex;
      gap: 32px;
      list-style: none;
      align-items: center;
    }
    .nav-links a {
      color: rgba(255,255,255,0.85);
      text-decoration: none;
      font-weight: 500;
      font-size: 16px;
      position: relative;
      padding-bottom: 4px;
      transition: var(--transition-smooth);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-red);
      transition: width 0.3s ease;
    }
    .nav-links a:hover {
      color: white;
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: none;
      border: none;
    }
    .hamburger span {
      width: 28px;
      height: 3px;
      background: white;
      border-radius: 3px;
      transition: 0.3s;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      height: calc(100vh - 72px);
      background: rgba(11, 14, 20, 0.98);
      backdrop-filter: blur(16px);
      flex-direction: column;
      justify-content: center;
      align-items: center;
      gap: 32px;
      z-index: 999;
      transform: translateX(100%);
      transition: transform 0.35s ease;
    }
    .mobile-menu.active {
      transform: translateX(0);
    }
    .mobile-menu a {
      color: white;
      font-size: 22px;
      font-weight: 600;
      text-decoration: none;
    }
    @media (max-width: 767px) {
      .nav-links {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .mobile-menu {
        display: flex;
      }
    }

    /* Hero */
    .hero {
      height: 100vh;
      min-height: 700px;
      background: linear-gradient(135deg, #0B0E14 0%, #1A1D24 100%);
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
    }
    .hero::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: radial-gradient(circle at 20% 30%, rgba(230,57,70,0.15) 0%, transparent 50%);
      pointer-events: none;
    }
    .hero-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
      gap: 40px;
    }
    .hero-text {
      flex: 1 1 55%;
      color: white;
    }
    .hero-text h1 {
      color: white;
      margin-bottom: 20px;
    }
    .hero-text .subtitle {
      font-size: 18px;
      line-height: 28px;
      color: rgba(255,255,255,0.7);
      margin-bottom: 32px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn {
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: var(--transition-smooth);
      border: none;
      cursor: pointer;
    }
    .btn-primary {
      background: var(--accent-red);
      color: white;
      box-shadow: 0 4px 14px rgba(230,57,70,0.4);
    }
    .btn-primary:hover {
      background: var(--accent-red-hover);
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(198,17,31,0.5);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid white;
      color: white;
    }
    .btn-outline:hover {
      background: white;
      color: var(--accent-red);
      border-color: white;
    }
    .hero-image {
      flex: 1 1 45%;
      display: flex;
      justify-content: center;
    }
    .hero-image img {
      max-width: 100%;
      height: auto;
      border-radius: 24px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.5);
      animation: float 6s ease-in-out infinite;
    }
    @keyframes float {
      0% { transform: translateY(0px); }
      50% { transform: translateY(-15px); }
      100% { transform: translateY(0px); }
    }
    @media (max-width: 1023px) {
      .hero-container {
        flex-direction: column;
        text-align: center;
        padding-top: 100px;
        padding-bottom: 60px;
      }
      .hero-text, .hero-image {
        flex: unset;
        width: 100%;
      }
      .hero-buttons {
        justify-content: center;
      }
      .hero-image img {
        max-height: 300px;
      }
    }

    /* 核心优势 横向滚动 */
    .advantages {
      background: white;
    }
    .adv-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding: 20px 0;
      scroll-snap-type: x mandatory;
      -webkit-overflow-scrolling: touch;
    }
    .adv-scroll::-webkit-scrollbar {
      display: none;
    }
    .adv-card {
      min-width: 280px;
      background: var(--card-bg);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
      scroll-snap-align: start;
      transition: var(--transition-smooth);
    }
    .adv-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--shadow-hover);
    }
    .adv-icon {
      font-size: 36px;
      color: var(--accent-red);
      margin-bottom: 20px;
    }
    .adv-card h3 {
      margin-bottom: 12px;
    }

    /* 功能矩阵 交错 */
    .feature-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }
    .feature-row.reverse {
      flex-direction: row-reverse;
    }
    .feature-text {
      flex: 1;
    }
    .feature-text ul {
      list-style: none;
      margin: 16px 0;
    }
    .feature-text li {
      margin-bottom: 10px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .feature-text li i {
      color: var(--highlight-gold);
    }
    .feature-image {
      flex: 1;
    }
    .feature-image img {
      width: 100%;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
    }
    @media (max-width: 767px) {
      .feature-row, .feature-row.reverse {
        flex-direction: column;
        gap: 32px;
      }
    }

    /* 场景 */
    .scenarios {
      background: var(--bg-dark-section);
      color: white;
    }
    .scenario-grid {
      display: flex;
      gap: 24px;
      flex-wrap: wrap;
    }
    .scenario-card {
      flex: 1 1 250px;
      background: rgba(255,255,255,0.06);
      backdrop-filter: blur(8px);
      border: 1px solid rgba(255,255,255,0.1);
      border-radius: var(--radius-card);
      padding: 32px;
      transition: 0.3s;
    }
    .scenario-card:hover {
      border-color: var(--accent-red);
      background: rgba(255,255,255,0.1);
    }

    /* 数据看板 */
    .stats-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding: 20px 0;
    }
    .stat-card {
      min-width: 200px;
      background: white;
      border-radius: var(--radius-card);
      padding: 24px;
      text-align: center;
      box-shadow: var(--shadow-sm);
    }
    .stat-number {
      font-family: var(--font-number);
      font-size: 42px;
      font-weight: 700;
      color: var(--highlight-gold);
    }

    /* FAQ */
    .faq-search {
      display: flex;
      align-items: center;
      background: white;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-input);
      padding: 12px 20px;
      margin-bottom: 32px;
    }
    .faq-search i {
      color: var(--text-light);
      margin-right: 12px;
    }
    .faq-search input {
      border: none;
      width: 100%;
      font-size: 16px;
      outline: none;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 16px 0;
      cursor: pointer;
    }
    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-gray);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 12px;
    }

    /* CTA */
    .cta-block {
      background: linear-gradient(135deg, #E63946 0%, #C1121F 100%);
      text-align: center;
      padding: 80px 24px;
      color: white;
    }
    .footer {
      background: #0B0E14;
      color: rgba(255,255,255,0.7);
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    @media (max-width: 767px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }
    .social-icons i {
      font-size: 20px;
      margin-right: 16px;
      color: white;
      transition: 0.2s;
    }
    .social-icons i:hover {
      color: var(--accent-red);
    }