/* roulang page: index */
:root {
      --primary: #FF4D1C;
      --primary-light: #FF6B3D;
      --secondary: #1A1A2E;
      --accent: #00E5A0;
      --accent-dark: #00C896;
      --bg: #FAFAFA;
      --card-bg: #FFFFFF;
      --text: #1A1A2E;
      --text-soft: #5A5A6E;
      --border-light: rgba(26, 26, 46, 0.08);
      --shadow-sm: 0 4px 20px rgba(26, 26, 46, 0.06);
      --shadow-hover: 0 12px 32px rgba(26, 26, 46, 0.12);
      --radius-card: 16px;
      --radius-btn: 10px;
      --radius-badge: 8px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
      --font-mono: "DIN Alternate", "Roboto Mono", "SF Mono", monospace;
      --transition: 0.3s ease;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s;
    }

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

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 40px;
    }

    @media (max-width: 1023px) {
      .container {
        padding: 0 32px;
      }
    }

    @media (max-width: 767px) {
      .container {
        padding: 0 20px;
      }
    }

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      height: 72px;
      display: flex;
      align-items: center;
      transition: background 0.3s, box-shadow 0.3s;
      background: transparent;
    }

    .site-header.scrolled {
      background: #FFFFFF;
      box-shadow: 0 2px 12px rgba(0,0,0,0.08);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 40px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 22px;
      color: #FFFFFF;
      transition: color 0.3s;
    }

    .scrolled .logo {
      color: var(--secondary);
    }

    .logo-icon {
      width: 36px;
      height: 36px;
      background: linear-gradient(135deg, #FF4D1C, #FF6B3D);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 20px;
      position: relative;
    }

    .logo-icon::after {
      content: "⚡";
      position: absolute;
      font-size: 18px;
      filter: drop-shadow(0 0 4px rgba(255,77,28,0.8));
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }

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

    .scrolled .nav-links a {
      color: var(--text);
    }

    .nav-links a:hover {
      color: var(--primary);
    }

    .btn-primary-small {
      background: var(--primary);
      color: white !important;
      padding: 10px 22px;
      border-radius: 20px;
      font-weight: 600;
      font-size: 14px;
      transition: 0.25s;
      border: none;
    }

    .btn-primary-small:hover {
      background: var(--primary-light);
      transform: scale(1.03);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
    }

    .hamburger span {
      width: 24px;
      height: 2px;
      background: white;
      transition: 0.3s;
    }

    .scrolled .hamburger span {
      background: var(--secondary);
    }

    @media (max-width: 1023px) {
      .nav-links {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .header-inner {
        padding: 0 32px;
      }
    }

    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: var(--secondary);
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      gap: 40px;
      z-index: 999;
      transform: translateX(100%);
      transition: transform 0.3s ease;
    }

    .mobile-menu.active {
      transform: translateX(0);
    }

    .mobile-menu a {
      color: white;
      font-size: 24px;
      font-weight: 600;
      position: relative;
      padding-left: 20px;
    }

    .mobile-menu a::before {
      content: '';
      position: absolute;
      left: 0;
      top: 50%;
      transform: translateY(-50%);
      width: 4px;
      height: 20px;
      background: var(--primary);
      border-radius: 2px;
    }

    /* Hero */
    .hero {
      background: linear-gradient(135deg, #1A1A2E 0%, #3D1C3D 100%);
      position: relative;
      overflow: hidden;
      min-height: 100vh;
      display: flex;
      align-items: center;
      color: white;
      padding-top: 72px;
    }

    .hero::before {
      content: '';
      position: absolute;
      top: -20%;
      right: -10%;
      width: 600px;
      height: 600px;
      background: radial-gradient(circle, rgba(255,77,28,0.25) 0%, transparent 70%);
      border-radius: 50%;
    }

    .hero .container {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
      width: 100%;
    }

    .hero-title {
      font-size: 48px;
      font-weight: 800;
      line-height: 1.2;
      margin-bottom: 24px;
    }

    .hero-sub {
      font-size: 18px;
      opacity: 0.9;
      margin-bottom: 40px;
      color: rgba(255,255,255,0.8);
    }

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

    .btn-gradient {
      background: linear-gradient(135deg, #FF4D1C, #FF6B3D);
      color: white;
      padding: 14px 32px;
      border-radius: 10px;
      font-weight: 600;
    }

    .btn-outline {
      border: 2px solid #FF4D1C;
      color: #FF4D1C;
      padding: 14px 32px;
      border-radius: 10px;
      font-weight: 600;
      background: transparent;
    }

    .btn-outline:hover {
      background: #FF4D1C;
      color: white;
    }

    .data-badges {
      display: flex;
      flex-direction: column;
      gap: 20px;
      position: relative;
    }

    .badge-card {
      background: rgba(255,255,255,0.08);
      backdrop-filter: blur(8px);
      border-radius: 16px;
      padding: 20px;
      color: white;
      display: flex;
      align-items: center;
      gap: 16px;
      animation: float 3s infinite alternate ease-in-out;
    }

    .badge-number {
      font-family: var(--font-mono);
      font-size: 32px;
      font-weight: 700;
      color: var(--accent);
    }

    @keyframes float {
      0% { transform: translateY(0); }
      100% { transform: translateY(-6px); }
    }

    @media (max-width: 1023px) {
      .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
      }
      .hero-title {
        font-size: 36px;
      }
      .data-badges {
        flex-direction: row;
        justify-content: center;
        flex-wrap: wrap;
      }
    }

    @media (max-width: 767px) {
      .hero-title {
        font-size: 28px;
      }
    }

    section {
      padding: 100px 0;
    }

    .section-title {
      font-size: 36px;
      font-weight: 700;
      margin-bottom: 48px;
      text-align: center;
    }

    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .metric-card {
      background: var(--card-bg);
      padding: 32px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: var(--transition);
    }

    .metric-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }

    .metric-value {
      font-family: var(--font-mono);
      font-size: 40px;
      font-weight: 700;
      background: linear-gradient(135deg, #00E5A0, #00C896);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .service-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .service-card:hover {
      border: 1px solid var(--primary);
      box-shadow: var(--shadow-hover);
    }

    .comparison-table {
      overflow-x: auto;
    }

    table {
      width: 100%;
      border-collapse: collapse;
      background: white;
      border-radius: 16px;
      overflow: hidden;
    }

    th {
      background: #F5F5F5;
      padding: 16px;
      text-align: left;
    }

    .highlight-col {
      background: #FFF5F0;
    }

    .faq-item {
      background: white;
      border-radius: 12px;
      margin-bottom: 16px;
      box-shadow: var(--shadow-sm);
    }

    .faq-question {
      padding: 20px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }

    .faq-answer {
      padding: 0 20px 20px;
      display: none;
    }

    .faq-item.active .faq-answer {
      display: block;
    }

    .cta-section {
      background: #1A1A2E;
      color: white;
      text-align: center;
      padding: 80px 0;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }

    @media (max-width: 767px) {
      .metrics-grid { grid-template-columns: 1fr 1fr; }
      .services-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
    }