/* roulang page: index */
:root {
      --primary: #0A2540;
      --primary-soft: #1e3a5f;
      --accent: #F6B83D;
      --accent-hover: #e0a72c;
      --bg: #F8FAFC;
      --card-bg: #FFFFFF;
      --border-light: #E2E8F0;
      --text-main: #1E293B;
      --text-muted: #64748B;
      --green: #10B981;
      --warning: #F59E0B;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 8px;
      --radius-container: 16px;
      --shadow-card: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
      --shadow-hover: 0 10px 25px -5px rgba(0,0,0,0.08), 0 8px 10px -6px rgba(0,0,0,0.04);
      --font-title: "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
      --font-body: "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
      --font-data: "Inter", "SF Pro Display", system-ui, -apple-system, sans-serif;
      --max-width: 1200px;
      --nav-height: 72px;
      --mobile-nav-height: 60px;
    }

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

    body {
      font-family: var(--font-body);
      background-color: var(--bg);
      color: var(--text-main);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }

    /* 导航 */
    .nav {
      position: sticky;
      top: 0;
      z-index: 50;
      background: #FFFFFF;
      border-bottom: 1px solid #E2E8F0;
      height: var(--nav-height);
      display: flex;
      align-items: center;
      box-shadow: 0 1px 4px rgba(0,0,0,0.02);
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo {
      font-family: var(--font-title);
      font-weight: 700;
      font-size: 1.8rem;
      color: var(--primary);
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 6px;
      text-decoration: none;
    }
    .logo-icon {
      font-size: 2rem;
      color: var(--accent);
      line-height: 1;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 2rem;
    }
    .nav-links a {
      text-decoration: none;
      font-weight: 500;
      color: var(--text-main);
      font-size: 1rem;
      padding-bottom: 6px;
      border-bottom: 2px solid transparent;
      transition: color 0.2s, border-color 0.2s;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
      border-bottom-color: var(--accent);
    }
    .btn-primary {
      background: var(--accent);
      color: #0A2540;
      font-weight: 600;
      padding: 0.7rem 1.8rem;
      border-radius: var(--radius-btn);
      text-decoration: none;
      display: inline-block;
      transition: background 0.2s ease, transform 0.1s;
      border: none;
      cursor: pointer;
      font-family: var(--font-body);
      letter-spacing: 0.3px;
      box-shadow: 0 2px 4px rgba(246,184,61,0.2);
    }
    .btn-primary:hover {
      background: var(--accent-hover);
      transform: translateY(-1px);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
      font-weight: 600;
      padding: 0.7rem 1.8rem;
      border-radius: var(--radius-btn);
      text-decoration: none;
      display: inline-block;
      transition: all 0.2s ease;
    }
    .btn-outline:hover {
      background: rgba(10,37,64,0.05);
      border-color: var(--primary-soft);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
    }
    .hamburger span {
      width: 26px;
      height: 2.5px;
      background: var(--primary);
      border-radius: 3px;
      transition: 0.2s;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: #FFFFFF;
      z-index: 100;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 2.2rem;
    }
    .mobile-menu a {
      font-size: 1.5rem;
      font-weight: 500;
      color: var(--primary);
      text-decoration: none;
    }
    .close-menu {
      position: absolute;
      top: 24px;
      right: 28px;
      background: none;
      border: none;
      font-size: 2.2rem;
      cursor: pointer;
      color: var(--primary);
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .nav { height: var(--mobile-nav-height); }
      .logo { font-size: 1.6rem; }
    }

    /* 区块通用 */
    section {
      padding: 80px 0;
    }
    h2 {
      font-family: var(--font-title);
      font-size: 2.25rem;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 0.75rem;
      letter-spacing: -0.3px;
    }
    .section-sub {
      color: var(--text-muted);
      font-size: 1rem;
      margin-bottom: 3rem;
      max-width: 600px;
    }
    .text-center {
      text-align: center;
      margin-left: auto;
      margin-right: auto;
    }

    /* Hero 看板 */
    .hero-grid {
      display: grid;
      grid-template-columns: 5fr 7fr;
      gap: 3rem;
      align-items: center;
    }
    .hero-left h1 {
      font-size: 3rem;
      font-weight: 700;
      color: var(--primary);
      line-height: 1.2;
      margin-bottom: 1.2rem;
    }
    .hero-left p {
      color: var(--text-muted);
      margin-bottom: 2rem;
      font-size: 1.1rem;
    }
    .hero-buttons {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }
    .data-cards {
      display: flex;
      gap: 1.2rem;
      justify-content: flex-end;
    }
    .data-card {
      background: #F1F5F9;
      border-radius: 12px;
      padding: 24px 20px;
      text-align: center;
      flex: 1;
      min-width: 120px;
    }
    .data-number {
      font-family: var(--font-data);
      font-size: 3.5rem;
      font-weight: 700;
      color: var(--primary);
      line-height: 1.1;
    }
    .data-label {
      font-size: 0.875rem;
      color: var(--text-muted);
      margin-top: 6px;
    }
    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; gap: 2.5rem; }
      .data-cards { justify-content: flex-start; flex-wrap: wrap; }
    }

    /* 服务时间轴卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
      margin-top: 1rem;
    }
    .service-card {
      background: var(--card-bg);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      padding: 32px;
      position: relative;
      transition: box-shadow 0.25s, border-color 0.2s;
      display: flex;
      flex-direction: column;
      border-left: 4px solid var(--accent);
    }
    .service-card:hover {
      box-shadow: var(--shadow-hover);
      border-top-color: var(--accent);
    }
    .service-icon {
      font-size: 2.5rem;
      color: var(--accent);
      margin-bottom: 1.5rem;
      margin-left: 0;
    }
    .service-card h3 {
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 0.8rem;
    }
    .service-card p {
      color: var(--text-muted);
      flex: 1;
      margin-bottom: 1.5rem;
    }
    .text-link {
      color: var(--primary);
      font-weight: 600;
      text-decoration: none;
      transition: color 0.2s, transform 0.2s;
      display: inline-block;
    }
    .text-link:hover {
      color: var(--accent);
      transform: translateX(4px);
    }
    @media (max-width: 768px) {
      .services-grid { grid-template-columns: 1fr; }
    }

    /* 结果对比 */
    .results-bg {
      background: #F1F5F9;
      width: 100%;
    }
    .compare-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3rem;
      align-items: start;
    }
    .compare-col {
      background: white;
      border-radius: var(--radius-card);
      padding: 2rem;
      box-shadow: var(--shadow-card);
    }
    .metric-row {
      display: flex;
      align-items: center;
      gap: 0.8rem;
      margin-bottom: 1.2rem;
      font-size: 1.1rem;
    }
    .dot-gray {
      width: 10px; height: 10px; background: #CBD5E1; border-radius: 50%;
    }
    .dot-accent {
      width: 10px; height: 10px; background: var(--accent); border-radius: 50%;
    }
    .text-weak { color: var(--text-muted); }
    .text-strong { font-weight: 700; color: var(--primary); }
    .green-badge {
      color: var(--green);
      font-weight: 600;
      margin-left: 0.5rem;
    }
    .testimonial {
      background: white;
      border-radius: var(--radius-card);
      padding: 2rem;
      margin-top: 2.5rem;
      font-style: italic;
      color: var(--text-muted);
      font-size: 1.25rem;
      display: flex;
      gap: 1rem;
      align-items: flex-start;
    }
    .quote-mark {
      font-size: 3rem;
      color: var(--accent);
      line-height: 1;
    }
    @media (max-width: 768px) {
      .compare-grid { grid-template-columns: 1fr; }
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }
    .faq-question {
      background: white;
      padding: 20px 24px;
      font-weight: 700;
      font-size: 1.1rem;
      color: var(--primary);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      transition: background 0.2s;
    }
    .faq-question:hover {
      background: #F8FAFC;
    }
    .faq-icon {
      font-size: 1.5rem;
      transition: transform 0.2s;
      color: var(--accent);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s;
      background: #F8FAFC;
      color: var(--text-muted);
      padding: 0 24px;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 0 24px 20px;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    /* CTA */
    .cta-section {
      background: var(--primary);
      padding: 80px 0;
    }
    .cta-title {
      color: white;
      font-size: 2.25rem;
      margin-bottom: 0.8rem;
    }
    .cta-sub {
      color: rgba(255,255,255,0.7);
      margin-bottom: 2.5rem;
    }
    .inline-form {
      display: flex;
      gap: 1rem;
      justify-content: center;
      flex-wrap: wrap;
      max-width: 700px;
      margin: 0 auto;
    }
    .inline-form input {
      padding: 0.9rem 1.2rem;
      border-radius: var(--radius-input);
      border: 1px solid #CBD5E1;
      background: white;
      flex: 1 1 200px;
      font-size: 1rem;
    }
    .inline-form input:focus {
      outline: none;
      border-color: var(--accent);
      box-shadow: 0 0 0 3px rgba(246,184,61,0.25);
    }
    .privacy-note {
      color: rgba(255,255,255,0.5);
      font-size: 0.8rem;
      margin-top: 1.2rem;
    }

    /* 页脚 */
    .footer {
      background: #0F172A;
      color: #94A3B8;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 2.5rem;
    }
    .footer-logo {
      font-size: 1.7rem;
      font-weight: 700;
      color: white;
      margin-bottom: 0.8rem;
    }
    .footer-desc {
      font-size: 0.95rem;
    }
    .footer h4 {
      color: white;
      margin-bottom: 1.2rem;
      font-weight: 600;
    }
    .footer a {
      color: #94A3B8;
      text-decoration: none;
      display: block;
      margin-bottom: 0.6rem;
      transition: color 0.2s;
    }
    .footer a:hover { color: var(--accent); }
    .social-icons {
      display: flex;
      gap: 0.8rem;
    }
    .social-circle {
      width: 36px; height: 36px;
      border: 1px solid #94A3B8;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #94A3B8;
      transition: 0.2s;
    }
    .social-circle:hover { border-color: var(--accent); color: var(--accent); }
    .copyright {
      border-top: 1px solid #1E293B;
      margin-top: 2.5rem;
      padding-top: 1.5rem;
      text-align: center;
      font-size: 0.9rem;
    }
    @media (max-width: 768px) {
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 520px) {
      .footer-grid { grid-template-columns: 1fr; }
    }

    button, .btn-primary {
      font-family: inherit;
    }