/* roulang page: index */
:root {
      --primary: #F04E23;
      --primary-dark: #D03D1A;
      --secondary: #1A1D23;
      --accent: #00E5FF;
      --bg: #F7F5F2;
      --white: #FFFFFF;
      --text: #2C3038;
      --text-light: #6B7280;
      --border-radius-lg: 16px;
      --border-radius-md: 12px;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.06);
      --shadow-hover: 0 12px 32px rgba(240,78,35,0.12);
      --font-mono: 'JetBrains Mono', 'Courier New', monospace;
    }

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

    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(26, 29, 35, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      z-index: 1000;
      display: flex;
      align-items: center;
      border-bottom: 1px solid rgba(255,255,255,0.05);
      transition: background 0.3s;
    }

    .navbar.scrolled {
      background: rgba(26, 29, 35, 0.95);
    }

    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--white);
      text-decoration: none;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .logo-dot {
      width: 10px;
      height: 10px;
      background: var(--primary);
      border-radius: 50%;
      display: inline-block;
    }

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

    .nav-links a {
      color: #ccc;
      text-decoration: none;
      font-weight: 500;
      font-size: 15px;
      transition: color 0.2s;
      position: relative;
      padding-bottom: 4px;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--white);
    }

    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--accent);
    }

    .nav-cta {
      background: var(--primary);
      color: var(--white) !important;
      padding: 10px 24px !important;
      border-radius: 25px;
      font-weight: 600;
      transition: background 0.2s, transform 0.2s;
    }

    .nav-cta:hover {
      background: var(--primary-dark);
      transform: translateY(-1px);
    }

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

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

    /* 移动端导航 */
    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 75%;
        height: 100vh;
        background: var(--primary);
        flex-direction: column;
        justify-content: center;
        gap: 40px;
        transition: right 0.3s;
        z-index: 999;
      }
      .nav-links.active {
        right: 0;
      }
      .nav-links a {
        color: var(--white);
        font-size: 22px;
      }
      .hamburger {
        display: flex;
        z-index: 1001;
      }
    }

    /* Hero */
    .hero {
      background: linear-gradient(135deg, #1A1D23 0%, #2A2E38 100%);
      min-height: 100vh;
      display: flex;
      align-items: center;
      padding-top: 72px;
      position: relative;
      overflow: hidden;
    }

    .hero::before {
      content: '';
      position: absolute;
      width: 400px;
      height: 400px;
      background: radial-gradient(circle, rgba(0,229,255,0.15) 0%, transparent 70%);
      top: -100px;
      right: -100px;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }

    .hero-title {
      font-size: 48px;
      font-weight: 700;
      color: var(--white);
      line-height: 1.2;
      margin-bottom: 20px;
    }

    .hero-sub {
      font-size: 18px;
      color: #aaa;
      margin-bottom: 32px;
    }

    .btn-primary {
      background: var(--primary);
      color: var(--white);
      padding: 14px 32px;
      border-radius: 12px;
      font-weight: 600;
      border: none;
      cursor: pointer;
      transition: 0.2s;
      text-decoration: none;
      display: inline-block;
    }

    .btn-primary:hover {
      background: var(--primary-dark);
      transform: translateY(-2px);
    }

    .data-board {
      background: rgba(255,255,255,0.05);
      backdrop-filter: blur(10px);
      border-radius: 20px;
      padding: 28px;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
      border: 1px solid rgba(255,255,255,0.1);
    }

    .metric {
      color: var(--white);
    }

    .metric-number {
      font-family: var(--font-mono);
      font-size: 32px;
      font-weight: 700;
      color: var(--accent);
      text-shadow: 0 0 8px rgba(0,229,255,0.4);
    }

    .metric-label {
      font-size: 13px;
      color: #aaa;
    }

    @media (max-width: 768px) {
      .hero-grid {
        grid-template-columns: 1fr;
      }
      .hero-title {
        font-size: 36px;
      }
    }

    /* 通用板块 */
    section {
      padding: 80px 0;
    }

    .section-title {
      font-size: 36px;
      font-weight: 700;
      color: var(--secondary);
      text-align: center;
      margin-bottom: 16px;
    }

    .section-desc {
      color: var(--text-light);
      max-width: 680px;
      margin: 0 auto 48px;
      text-align: center;
    }

    /* 服务卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .service-card {
      background: var(--white);
      padding: 28px;
      border-radius: var(--border-radius-lg);
      box-shadow: var(--shadow-sm);
      transition: 0.2s;
    }

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

    .service-icon {
      font-size: 32px;
      color: var(--primary);
      margin-bottom: 16px;
    }

    .service-card h3 {
      font-size: 20px;
      margin-bottom: 12px;
    }

    @media (max-width: 1024px) {
      .services-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 640px) {
      .services-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 对比区 */
    .compare-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 30px;
      align-items: center;
    }

    .compare-card {
      background: var(--white);
      padding: 32px;
      border-radius: var(--border-radius-lg);
      box-shadow: var(--shadow-sm);
    }

    .compare-card.old {
      border-left: 4px solid #ccc;
    }
    .compare-card.new {
      border-left: 4px solid var(--primary);
    }

    .bar {
      height: 12px;
      background: #eee;
      border-radius: 10px;
      margin: 12px 0;
    }
    .bar-fill {
      height: 100%;
      border-radius: 10px;
    }
    .bar-fill.orange {
      background: var(--primary);
      width: 92%;
    }
    .bar-fill.gray {
      background: #ccc;
      width: 45%;
    }

    /* 流程 */
    .steps {
      display: flex;
      justify-content: space-between;
      text-align: center;
    }
    .step {
      flex: 1;
    }
    .step-num {
      font-size: 48px;
      font-weight: 700;
      color: var(--primary);
    }
    @media (max-width: 640px) {
      .steps {
        flex-direction: column;
        gap: 32px;
      }
    }

    /* FAQ */
    .faq-item {
      background: var(--white);
      border-radius: 12px;
      margin-bottom: 12px;
      padding: 20px;
      cursor: pointer;
    }
    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
    }

    /* CTA 表单 */
    .cta-section {
      background: var(--secondary);
      color: var(--white);
      padding: 80px 0;
    }
    .form-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
    }
    .form-input {
      width: 100%;
      padding: 14px;
      margin-bottom: 16px;
      border-radius: 8px;
      border: none;
      background: rgba(255,255,255,0.1);
      color: white;
    }
    @media (max-width: 640px) {
      .form-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 页脚 */
    footer {
      background: var(--secondary);
      color: #aaa;
      padding: 40px 0;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }