/* roulang page: index */
:root {
      --primary: #E8453C;
      --primary-hover: #C0392B;
      --secondary: #1E1E24;
      --background: #F5F1EB;
      --card-white: #FFFFFF;
      --accent: #A3E635;
      --amber: #F59E0B;
      --text-dark: #1E1E24;
      --text-muted: #5A5A66;
      --border-light: rgba(30, 30, 36, 0.08);
      --shadow-sm: 0 2px 16px rgba(30, 30, 36, 0.06);
      --shadow-md: 0 8px 32px rgba(30, 30, 36, 0.12);
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --radius-full: 50px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", system-ui, -apple-system, sans-serif;
      --transition: 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--background);
      color: var(--text-dark);
      line-height: 1.7;
      font-weight: 400;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }

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

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

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }

    button, input, select {
      font-family: inherit;
      outline: none;
    }

    /* 导航 */
    #header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(30, 30, 36, 0.75);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      z-index: 1000;
      display: flex;
      align-items: center;
      transition: background 0.3s, box-shadow 0.3s;
      border-bottom: 1px solid rgba(255,255,255,0.05);
    }

    #header.scrolled {
      background: rgba(20, 20, 24, 0.92);
      box-shadow: 0 4px 20px rgba(0,0,0,0.2);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 1.5rem;
      font-weight: 700;
      color: #fff;
      letter-spacing: -0.5px;
    }

    .logo-icon {
      width: 32px;
      height: 32px;
      border-radius: 50%;
      background: conic-gradient(var(--primary) 0deg 90deg, var(--accent) 90deg 180deg, var(--amber) 180deg 270deg, var(--secondary) 270deg 360deg);
    }

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

    .nav-menu a {
      font-size: 15px;
      font-weight: 500;
      color: #F5F1EB;
      position: relative;
      padding: 4px 0;
    }

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

    .nav-menu a:hover::after,
    .nav-menu a.active::after {
      width: 100%;
    }

    .nav-cta {
      background: var(--primary);
      color: white;
      padding: 10px 22px;
      border-radius: var(--radius-full);
      font-weight: 600;
      font-size: 14px;
      transition: var(--transition);
      margin-left: 10px;
    }

    .nav-cta:hover {
      background: var(--primary-hover);
      transform: scale(1.03);
    }

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

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

    @media (max-width: 768px) {
      .nav-menu {
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: rgba(20, 20, 24, 0.98);
        flex-direction: column;
        padding: 32px;
        gap: 24px;
        transform: translateY(-150%);
        transition: transform 0.4s ease;
        backdrop-filter: blur(20px);
      }
      .nav-menu.open {
        transform: translateY(0);
      }
      .hamburger {
        display: flex;
      }
      .nav-cta {
        margin-left: 0;
        width: 100%;
        text-align: center;
      }
    }

    /* Hero */
    #hero {
      height: 100vh;
      min-height: 700px;
      background: linear-gradient(135deg, #1E1E24 0%, #0A0A0F 100%);
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
    }

    .hero-bg-lines {
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 30% 40%, rgba(232,69,60,0.15) 0%, transparent 50%);
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
      width: 100%;
      position: relative;
      z-index: 2;
    }

    .hero-left {
      flex: 1 1 55%;
      color: white;
    }

    .hero-left h1 {
      font-size: 3.5rem;
      font-weight: 800;
      line-height: 1.15;
      letter-spacing: -0.02em;
      margin-bottom: 1.5rem;
    }

    .hero-sub {
      font-size: 1.125rem;
      color: #D1D5DB;
      margin-bottom: 2.5rem;
      max-width: 480px;
    }

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

    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 16px 36px;
      border-radius: var(--radius-full);
      font-weight: 600;
      transition: var(--transition);
      border: none;
      cursor: pointer;
    }

    .btn-primary:hover {
      background: var(--primary-hover);
      transform: scale(1.03);
      box-shadow: 0 8px 20px rgba(232,69,60,0.4);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid #1E1E24;
      color: #1E1E24;
      padding: 16px 36px;
      border-radius: var(--radius-full);
      font-weight: 600;
    }

    .btn-outline-light {
      border-color: #F5F1EB;
      color: #F5F1EB;
    }

    .hero-right {
      flex: 1 1 45%;
      background: rgba(255,255,255,0.06);
      backdrop-filter: blur(12px);
      border-radius: 24px;
      padding: 32px;
      border: 1px solid rgba(255,255,255,0.1);
    }

    .stat-card {
      display: flex;
      justify-content: space-between;
    }

    .stat-item {
      text-align: center;
      color: white;
    }

    .stat-number {
      font-size: 2.8rem;
      font-weight: 900;
      color: var(--primary);
      font-variant-numeric: tabular-nums;
    }

    @media (max-width: 1024px) {
      .hero-grid {
        flex-direction: column;
        gap: 40px;
      }
      .hero-left h1 {
        font-size: 2.5rem;
      }
      #hero {
        height: auto;
        padding: 140px 0 80px;
      }
    }

    /* 板块通用 */
    section {
      padding: 100px 0;
    }

    .section-title {
      font-size: 2.5rem;
      font-weight: 700;
      margin-bottom: 16px;
    }

    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
      .container {
        padding: 0 24px;
      }
      .section-title {
        font-size: 2rem;
      }
    }

    /* 数据看板 */
    .dashboard-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 40px;
    }

    .metric-card {
      background: var(--card-white);
      border-radius: var(--radius-md);
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
      border-top: 3px solid var(--accent);
      text-align: center;
    }

    /* 服务非对称 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
      margin-top: 40px;
    }

    .service-card {
      background: white;
      border-radius: var(--radius-md);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      border-left: 4px solid var(--primary);
      display: flex;
      gap: 24px;
    }

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

    @media (max-width: 768px) {
      .services-grid {
        grid-template-columns: 1fr;
      }
      .dashboard-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 对比区 */
    .compare-wrapper {
      display: flex;
      align-items: stretch;
      gap: 0;
      margin-top: 40px;
      background: white;
      border-radius: 24px;
      overflow: hidden;
    }

    .compare-left, .compare-right {
      flex: 1;
      padding: 40px;
    }

    .compare-left {
      background: #FEF2F2;
    }
    .compare-right {
      background: #F0FDF4;
    }

    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }

    .faq-item {
      background: white;
      border-radius: var(--radius-md);
      padding: 20px;
      cursor: pointer;
    }

    @media (max-width: 768px) {
      .faq-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 表单 */
    .contact-section {
      background: var(--secondary);
    }
    .form-card {
      background: rgba(255,255,255,0.08);
      backdrop-filter: blur(10px);
      border-radius: 24px;
      padding: 48px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      color: #9CA3AF;
    }

    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }