/* roulang page: index */
:root {
      --primary: #0A0E27;
      --accent: #D4AF37;
      --accent-hover: #B8960F;
      --bg: #F5F3EF;
      --card-bg: #FFFFFF;
      --text-main: #1A1A1A;
      --text-secondary: #5C5C5C;
      --text-muted: #8C8C8C;
      --border: #E5E0D9;
      --success: #0F9D58;
      --danger: #C0392B;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --shadow-card: 0 2px 16px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 30px rgba(0,0,0,0.08);
      --font-sans: -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      --font-number: 'Inter', -apple-system, sans-serif;
      --max-width: 1200px;
      --header-height: 72px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text-main);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.25s ease;
    }
    button, input {
      font-family: inherit;
      outline: none;
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--header-height);
      background: #FFFFFF;
      z-index: 100;
      border-bottom: 1px solid transparent;
      transition: box-shadow 0.25s ease, border-color 0.25s ease;
      display: flex;
      align-items: center;
    }
    .header.scrolled {
      box-shadow: 0 1px 0 var(--border);
      border-bottom: 1px solid var(--border);
    }
    .header .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.3px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo span {
      color: var(--accent);
    }
    .logo-icon {
      font-size: 24px;
      margin-right: 2px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-main);
      transition: color 0.2s;
      white-space: nowrap;
    }
    .nav-links a:hover {
      color: var(--accent);
    }
    .btn-primary {
      background: var(--accent);
      color: #FFFFFF;
      border: none;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 15px;
      cursor: pointer;
      transition: background 0.25s ease, transform 0.2s;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      white-space: nowrap;
    }
    .btn-primary:hover {
      background: var(--accent-hover);
      transform: translateY(-1px);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--primary);
      color: var(--primary);
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 15px;
      cursor: pointer;
      transition: all 0.25s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }
    .btn-outline:hover {
      border-color: var(--accent);
      color: var(--accent);
      background: rgba(212,175,55,0.03);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
      padding: 8px;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--primary);
      transition: 0.3s;
    }
    /* 移动端导航 */
    @media (max-width: 767px) {
      .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 75%;
        max-width: 320px;
        height: 100vh;
        background: #FFFFFF;
        flex-direction: column;
        padding: 100px 32px 40px;
        gap: 28px;
        box-shadow: -5px 0 25px rgba(0,0,0,0.08);
        transition: right 0.35s ease;
        z-index: 99;
      }
      .nav-links.active {
        right: 0;
      }
      .hamburger {
        display: flex;
        z-index: 101;
      }
      .nav-links a {
        font-size: 18px;
      }
    }
    /* Hero */
    .hero {
      padding: calc(var(--header-height) + 48px) 0 60px;
      background: var(--bg);
      position: relative;
      overflow: hidden;
      min-height: 100vh;
      display: flex;
      align-items: center;
    }
    .hero .container {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .hero-content h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.15;
      letter-spacing: -0.5px;
      color: var(--primary);
      margin-bottom: 20px;
    }
    .hero-content p {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 32px;
      max-width: 480px;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-visual {
      position: relative;
      display: flex;
      justify-content: center;
      align-items: center;
    }
    .hero-image {
      width: 100%;
      max-width: 420px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
    }
    .badge-float {
      position: absolute;
      background: #FFFFFF;
      padding: 12px 18px;
      border-radius: 40px;
      box-shadow: 0 6px 20px rgba(0,0,0,0.06);
      font-weight: 600;
      font-size: 14px;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 8px;
      animation: float 3s ease-in-out infinite;
    }
    .badge-1 { top: 10%; right: 5%; }
    .badge-2 { bottom: 15%; left: 0%; animation-delay: 1s; }
    @keyframes float {
      0% { transform: translateY(0); }
      50% { transform: translateY(-6px); }
      100% { transform: translateY(0); }
    }
    /* 通用区块 */
    section {
      padding: 100px 0;
    }
    .section-title {
      text-align: center;
      margin-bottom: 48px;
    }
    .section-title h2 {
      font-size: 32px;
      font-weight: 600;
      color: var(--primary);
      margin-bottom: 12px;
    }
    .section-title p {
      color: var(--text-secondary);
      max-width: 600px;
      margin: 0 auto;
    }
    /* 指标看板 */
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .metric-card {
      background: var(--card-bg);
      padding: 32px;
      border-radius: 0;
      box-shadow: var(--shadow-card);
      text-align: center;
      transition: all 0.3s ease;
      border-bottom: 3px solid transparent;
    }
    .metric-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-bottom-color: var(--accent);
    }
    .metric-number {
      font-family: var(--font-number);
      font-size: 48px;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 8px;
    }
    .metric-label {
      color: var(--text-secondary);
      font-size: 15px;
    }
    /* 服务卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .service-card {
      background: var(--card-bg);
      padding: 32px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: all 0.3s ease;
      border-top: 3px solid transparent;
      display: flex;
      flex-direction: column;
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-top-color: var(--accent);
    }
    .service-icon {
      width: 64px;
      height: 64px;
      margin-bottom: 20px;
      background: #F5F3EF;
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .service-card h3 {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 8px;
    }
    .service-desc {
      color: var(--text-secondary);
      margin-bottom: 16px;
      font-size: 15px;
    }
    .service-list {
      list-style: none;
      margin-bottom: 20px;
      flex: 1;
    }
    .service-list li {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 14px;
      color: var(--text-secondary);
      margin-bottom: 8px;
    }
    .service-list li::before {
      content: "✓";
      color: var(--success);
      font-weight: 700;
    }
    .card-link {
      color: var(--accent);
      font-weight: 600;
      font-size: 14px;
      align-self: flex-start;
    }
    /* 对比 */
    .compare-wrapper {
      display: grid;
      grid-template-columns: 1fr auto 1fr;
      gap: 24px;
      align-items: center;
    }
    .compare-col {
      background: var(--card-bg);
      padding: 32px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: 0.3s;
    }
    .compare-left {
      background: #F0EDE8;
      color: var(--text-muted);
    }
    .compare-right {
      border: 1px solid var(--accent);
    }
    .compare-item {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 16px;
    }
    .compare-left .compare-item span { color: var(--danger); }
    .compare-right .compare-item span { color: var(--success); }
    .vs-badge {
      font-weight: 700;
      font-size: 20px;
      color: var(--accent);
    }
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      background: var(--card-bg);
      border-bottom: 1px solid var(--border);
      margin-bottom: 8px;
    }
    .faq-question {
      width: 100%;
      background: transparent;
      border: none;
      padding: 20px 24px;
      font-size: 17px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      color: var(--primary);
    }
    .faq-icon {
      font-size: 20px;
      transition: transform 0.35s ease;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.35s;
      padding: 0 24px;
      color: var(--text-secondary);
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      padding: 0 24px 20px;
    }
    .faq-item.open .faq-icon {
      transform: rotate(45deg);
    }
    /* 联系表单 */
    .contact-form {
      max-width: 500px;
      margin: 0 auto;
      display: flex;
      gap: 12px;
    }
    .contact-form input {
      flex: 1;
      padding: 14px 18px;
      border: 1px solid var(--border);
      border-radius: var(--radius-input);
      font-size: 16px;
      background: #FFFFFF;
      transition: border 0.2s;
    }
    .contact-form input:focus {
      border-color: var(--accent);
    }
    .form-note {
      text-align: center;
      margin-top: 12px;
      font-size: 13px;
      color: var(--text-muted);
    }
    /* Footer */
    .footer {
      background: var(--primary);
      color: #B0B0B0;
      padding: 48px 0 32px;
    }
    .footer-grid {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 24px;
    }
    .footer-links a {
      margin-left: 24px;
      color: #B0B0B0;
    }
    .footer-links a:hover {
      color: #FFFFFF;
    }
    @media (max-width: 1023px) {
      .hero .container { grid-template-columns: 1fr; text-align: center; }
      .hero-content p { margin-left: auto; margin-right: auto; }
      .hero-actions { justify-content: center; }
      .metrics-grid { grid-template-columns: repeat(2, 1fr); }
      .services-grid { grid-template-columns: repeat(2, 1fr); }
      .compare-wrapper { grid-template-columns: 1fr; }
      .vs-badge { text-align: center; }
    }
    @media (max-width: 767px) {
      .hero-content h1 { font-size: 36px; }
      section { padding: 60px 0; }
      .metrics-grid, .services-grid { grid-template-columns: 1fr; }
      .contact-form { flex-direction: column; }
      .footer-grid { flex-direction: column; text-align: center; }
    }