/* roulang page: index */
:root {
      --primary: #E94E1B;
      --primary-dark: #C73E12;
      --primary-light-bg: #FFF0EB;
      --secondary: #1B1F2A;
      --accent: #00C2BA;
      --gray-bg: #FAFAFC;
      --white: #FFFFFF;
      --text-main: #2A2F3C;
      --text-secondary: #5A6270;
      --text-muted: #8E96A3;
      --border-light: #EDEEF2;
      --radius-card: 16px;
      --radius-btn: 10px;
      --radius-input: 8px;
      --shadow-card: 0 4px 16px rgba(0,0,0,0.05);
      --shadow-hover: 0 18px 32px rgba(0,0,0,0.1);
      --transition: all 0.25s ease;
      --container-max: 1280px;
      --space-section: 80px;
      --space-mobile: 48px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: "Inter", "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, sans-serif;
      background-color: var(--gray-bg);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    button {
      font-family: inherit;
      cursor: pointer;
      border: none;
      background: none;
    }
    /* 导航 */
    #header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      box-shadow: 0 2px 12px rgba(0,0,0,0.02);
      transition: var(--transition);
      height: 76px;
      display: flex;
      align-items: center;
    }
    #header.scrolled {
      box-shadow: 0 6px 24px rgba(0,0,0,0.06);
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo {
      font-weight: 700;
      font-size: 22px;
      display: flex;
      align-items: center;
      gap: 8px;
      color: var(--secondary);
    }
    .logo i {
      color: var(--primary);
      font-size: 28px;
      transform: rotate(-4deg);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      font-weight: 500;
      font-size: 15px;
      color: var(--text-secondary);
      position: relative;
      padding: 8px 0;
      transition: var(--transition);
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0%;
      height: 3px;
      background: var(--primary);
      border-radius: 6px;
      transition: width 0.2s;
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    .btn-nav {
      background: var(--primary);
      color: white !important;
      padding: 10px 24px !important;
      border-radius: var(--radius-btn);
      font-weight: 600;
      box-shadow: 0 4px 10px rgba(233,78,27,0.3);
    }
    .btn-nav:hover {
      background: var(--primary-dark) !important;
      color: white !important;
    }
    .menu-toggle {
      display: none;
      font-size: 26px;
      color: var(--secondary);
    }
    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: 76px;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        align-items: flex-start;
        padding: 24px;
        gap: 20px;
        box-shadow: 0 12px 28px rgba(0,0,0,0.08);
        transform: translateY(-120%);
        opacity: 0;
        transition: transform 0.3s ease, opacity 0.2s;
        pointer-events: none;
        border-radius: 0 0 24px 24px;
      }
      .nav-links.active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: auto;
      }
      .menu-toggle {
        display: block;
      }
      .btn-nav {
        width: 100%;
        text-align: center;
      }
    }
    /* Hero */
    #hero {
      padding: 60px 0 80px;
      background: var(--gray-bg);
      position: relative;
      overflow: hidden;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 48px;
    }
    .hero-left {
      flex: 1 1 55%;
    }
    .hero-right {
      flex: 1 1 45%;
      position: relative;
      animation: float 5s infinite alternate ease-in-out;
    }
    @keyframes float {
      0% { transform: translateY(0); }
      100% { transform: translateY(-12px); }
    }
    .hero-right img {
      border-radius: 32px;
      box-shadow: 0 24px 48px rgba(233,78,27,0.18);
    }
    h1 {
      font-size: 44px;
      line-height: 1.2;
      font-weight: 700;
      letter-spacing: -0.5px;
      color: var(--secondary);
      margin-bottom: 20px;
    }
    .hero-desc {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 32px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 28px;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      box-shadow: 0 8px 20px rgba(233,78,27,0.3);
      transition: var(--transition);
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      transform: scale(1.02);
      box-shadow: 0 14px 28px rgba(233,78,27,0.35);
    }
    .btn-outline {
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 12px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: var(--transition);
    }
    .btn-outline:hover {
      background: var(--primary-light-bg);
    }
    .trust-badge {
      display: flex;
      gap: 28px;
      color: var(--text-muted);
      font-size: 14px;
    }
    @media (max-width: 768px) {
      .hero-grid {
        flex-direction: column;
      }
      h1 {
        font-size: 32px;
      }
      .hero-right {
        order: -1;
      }
    }
    /* dashboard */
    #dashboard {
      background: var(--secondary);
      padding: 64px 0;
    }
    .section-title {
      font-size: 28px;
      font-weight: 600;
      margin-bottom: 40px;
      color: white;
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .section-title::before {
      content: '';
      width: 48px;
      height: 4px;
      background: var(--primary);
      border-radius: 4px;
    }
    .kpi-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 24px;
    }
    .kpi-card {
      background: rgba(255,255,255,0.05);
      backdrop-filter: blur(4px);
      border-radius: var(--radius-card);
      padding: 28px 24px;
      color: white;
    }
    .kpi-number {
      font-size: 36px;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 8px;
    }
    .kpi-label {
      color: #B0B8C1;
      font-size: 15px;
    }
    @media (max-width: 768px) {
      .kpi-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    /* services */
    #services {
      padding: var(--space-section) 0;
      background: white;
    }
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 28px;
    }
    .service-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    .service-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--shadow-hover);
    }
    .service-icon {
      width: 64px;
      height: 64px;
      background: #F0F2F5;
      border-radius: 20px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 28px;
      color: var(--primary);
      margin-bottom: 20px;
    }
    .service-card h3 {
      font-size: 20px;
      margin-bottom: 10px;
    }
    @media (max-width: 768px) {
      .services-grid {
        grid-template-columns: 1fr;
      }
    }
    /* compare */
    #compare {
      padding: var(--space-section) 0;
      background: var(--gray-bg);
    }
    .compare-table {
      width: 100%;
      border-collapse: collapse;
      background: white;
      border-radius: 24px;
      overflow: hidden;
      box-shadow: var(--shadow-card);
    }
    .compare-table th {
      background: var(--primary);
      color: white;
      padding: 18px;
      text-align: left;
    }
    .compare-table td {
      padding: 16px 18px;
      border-bottom: 1px solid var(--border-light);
    }
    .highlight-col {
      color: var(--accent);
      font-weight: 600;
    }
    @media (max-width: 768px) {
      .table-wrapper {
        overflow-x: auto;
      }
    }
    /* faq */
    #faq {
      padding: var(--space-section) 0;
      background: white;
    }
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 16px 0;
    }
    .faq-question {
      font-weight: 600;
      font-size: 18px;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-secondary);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 12px;
    }
    @media (max-width: 768px) {
      .faq-grid {
        grid-template-columns: 1fr;
      }
    }
    /* cta */
    #cta {
      background: var(--secondary);
      text-align: center;
      padding: 80px 0;
      color: white;
    }
    .btn-large {
      background: var(--primary);
      font-size: 20px;
      padding: 18px 48px;
      border-radius: 60px;
      margin: 24px 0;
    }
    /* footer */
    #footer {
      background: #141820;
      color: #B0B8C1;
      padding: 48px 0 24px;
    }