/* roulang page: index */
:root {
      --primary: #0F2440;
      --primary-hover: #0A1A30;
      --accent: #C8A96E;
      --accent-light: rgba(200, 169, 110, 0.18);
      --bg: #FAF9F6;
      --bg-soft: #F0F3F7;
      --card-bg: #FFFFFF;
      --text: #1E293B;
      --text-soft: #64748B;
      --text-muted: #94A3B8;
      --border-light: #E2E8F0;
      --shadow-sm: 0 2px 8px rgba(15, 36, 64, 0.06);
      --shadow-md: 0 8px 24px rgba(15, 36, 64, 0.12);
      --radius-card: 8px;
      --radius-btn: 4px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.7;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease, border-color 0.2s ease;
    }

    .container {
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 48px;
    }

    @media (max-width: 1024px) {
      .container {
        padding: 0 32px;
      }
    }

    @media (max-width: 768px) {
      .container {
        padding: 0 20px;
      }
    }

    /* 导航栏 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 48px;
      background: transparent;
      transition: background 0.3s ease, backdrop-filter 0.3s ease, box-shadow 0.3s ease;
      z-index: 100;
      border-bottom: 1px solid transparent;
    }

    .site-header.scrolled {
      background: rgba(250, 249, 246, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-light);
      box-shadow: 0 2px 8px rgba(0,0,0,0.02);
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 22px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.3px;
    }

    .logo .accent-line {
      display: inline-block;
      width: 2px;
      height: 22px;
      background-color: var(--accent);
      margin-left: 4px;
      border-radius: 1px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 40px;
      font-size: 15px;
      font-weight: 500;
      color: #4A5568;
    }

    .nav-links a {
      position: relative;
      padding: 4px 0;
      color: #4A5568;
    }

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

    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 100%;
      height: 2px;
      background-color: var(--accent);
      border-radius: 1px;
    }

    .header-icon {
      display: flex;
      align-items: center;
      justify-content: center;
      width: 40px;
      height: 40px;
      border: 1.5px solid var(--accent);
      border-radius: 50%;
      color: var(--accent);
      font-size: 18px;
      transition: background 0.2s;
      cursor: pointer;
      background: transparent;
    }

    .header-icon:hover {
      background: var(--accent-light);
    }

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

    .burger span {
      display: block;
      width: 24px;
      height: 2px;
      background: var(--primary);
      border-radius: 2px;
      transition: 0.2s;
    }

    .mobile-menu {
      display: none;
    }

    @media (max-width: 768px) {
      .site-header {
        padding: 0 20px;
      }
      .nav-links, .header-icon.desktop-only {
        display: none;
      }
      .burger {
        display: flex;
      }
      .mobile-menu {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background: rgba(15, 36, 64, 0.96);
        backdrop-filter: blur(8px);
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 28px;
        z-index: 200;
        transform: translateX(100%);
        transition: transform 0.35s ease;
      }
      .mobile-menu.open {
        transform: translateX(0);
      }
      .mobile-menu a {
        font-size: 22px;
        font-weight: 500;
        color: white;
        border-bottom: 1px solid rgba(255,255,255,0.15);
        padding-bottom: 12px;
        width: 200px;
        text-align: center;
      }
      .mobile-close {
        position: absolute;
        top: 24px;
        right: 24px;
        font-size: 28px;
        color: white;
        background: none;
        border: none;
      }
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, rgba(15,36,64,0.03) 0%, rgba(250,249,246,0.9) 70%);
      padding-top: 72px;
    }

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

    .hero-title {
      font-size: 3rem;
      font-weight: 600;
      line-height: 1.2;
      color: var(--primary);
      margin-bottom: 20px;
    }

    .hero-title .highlight {
      color: var(--accent);
      font-weight: 700;
    }

    .hero-sub {
      font-size: 1.125rem;
      color: var(--text-soft);
      max-width: 480px;
      margin-bottom: 32px;
    }

    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

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

    .btn-primary:hover {
      background: var(--primary-hover);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--accent);
      color: var(--accent);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      cursor: pointer;
      transition: background 0.2s;
    }

    .btn-outline:hover {
      background: var(--accent-light);
    }

    .hero-image {
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      border-radius: 24px;
      height: 420px;
      position: relative;
      overflow: hidden;
      box-shadow: var(--shadow-md);
    }

    .hero-image::after {
      content: '';
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 30% 40%, rgba(15,36,64,0.2) 0%, transparent 70%);
    }

    @media (max-width: 1024px) {
      .hero-title {
        font-size: 2.2rem;
      }
      .hero-grid {
        gap: 40px;
      }
    }

    @media (max-width: 768px) {
      .hero-grid {
        grid-template-columns: 1fr;
        text-align: center;
      }
      .hero-title {
        font-size: 1.9rem;
      }
      .hero-sub {
        margin-left: auto;
        margin-right: auto;
      }
      .btn-group {
        justify-content: center;
      }
      .hero-image {
        height: 280px;
        order: -1;
        margin-top: 30px;
      }
    }

    /* 指标看板 */
    .stats {
      background: var(--bg-soft);
      padding: 80px 0;
    }

    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      text-align: center;
      gap: 24px;
    }

    .stat-number {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.02em;
    }

    .stat-line {
      width: 28px;
      height: 4px;
      background: var(--accent);
      margin: 12px auto;
      border-radius: 2px;
    }

    .stat-label {
      font-size: 0.9rem;
      color: var(--text-soft);
    }

    @media (max-width: 768px) {
      .stats-grid {
        grid-template-columns: 1fr 1fr;
        row-gap: 32px;
      }
    }

    /* 核心优势 */
    .advantages {
      padding: 90px 0;
      background: var(--bg);
    }

    .section-title {
      font-size: 2rem;
      font-weight: 600;
      color: var(--primary);
      margin-bottom: 48px;
      text-align: center;
    }

    .adv-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 48px;
      text-align: center;
    }

    .adv-icon {
      font-size: 2.2rem;
      color: var(--accent);
      margin-bottom: 16px;
    }

    .adv-title {
      font-size: 1.25rem;
      font-weight: 600;
      margin-bottom: 10px;
    }

    .adv-desc {
      color: var(--text-soft);
      font-size: 0.95rem;
    }

    @media (max-width: 768px) {
      .adv-grid {
        grid-template-columns: 1fr;
        gap: 36px;
      }
    }

    /* 服务矩阵 */
    .services {
      padding: 80px 0;
      background: var(--bg-soft);
    }

    .service-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .service-card {
      background: var(--card-bg);
      padding: 32px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: transform 0.2s, box-shadow 0.2s;
      display: flex;
      flex-direction: column;
    }

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

    .service-img {
      width: 52px;
      height: 52px;
      object-fit: contain;
      margin-bottom: 20px;
    }

    .service-name {
      font-size: 1.25rem;
      font-weight: 600;
      margin-bottom: 8px;
    }

    .service-desc {
      color: var(--text-soft);
      font-size: 0.9rem;
      margin-bottom: 18px;
      flex: 1;
    }

    .service-link {
      color: var(--primary);
      font-weight: 500;
      font-size: 0.9rem;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    .service-link:hover {
      color: var(--accent);
    }

    @media (max-width: 1024px) {
      .service-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 640px) {
      .service-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 对比 */
    .comparison {
      padding: 90px 0;
      background: white;
    }

    .comp-container {
      display: grid;
      grid-template-columns: 1fr auto 1fr;
      align-items: center;
      gap: 20px;
    }

    .comp-card {
      padding: 36px;
      border-radius: 12px;
      background: #F8FAFC;
    }

    .comp-card.premium {
      background: #EBF0F7;
      border-left: 3px solid var(--accent);
    }

    .comp-title {
      font-weight: 600;
      font-size: 1.3rem;
      margin-bottom: 18px;
    }

    .comp-list {
      list-style: none;
    }

    .comp-list li {
      margin-bottom: 12px;
      display: flex;
      align-items: center;
      gap: 10px;
      color: #334155;
    }

    .vs-badge {
      background: var(--primary);
      color: white;
      width: 56px;
      height: 56px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      box-shadow: var(--shadow-md);
      font-size: 1.2rem;
    }

    @media (max-width: 768px) {
      .comp-container {
        grid-template-columns: 1fr;
      }
      .vs-badge {
        margin: 16px auto;
      }
    }

    /* FAQ */
    .faq {
      padding: 80px 0;
      background: var(--bg);
    }

    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 18px 0;
      cursor: pointer;
    }

    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      font-size: 1.05rem;
      color: var(--primary);
    }

    .faq-icon {
      width: 24px;
      height: 24px;
      border: 1.5px solid var(--accent);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--accent);
      font-weight: bold;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: #4A5568;
      font-size: 0.95rem;
      padding-left: 4px;
    }

    .faq-item.active .faq-answer {
      max-height: 150px;
      padding: 12px 0 8px;
    }

    /* CTA */
    .cta {
      background: linear-gradient(135deg, #0F2440 0%, #1A365D 100%);
      padding: 80px 0;
      text-align: center;
      color: white;
    }

    .cta-title {
      font-size: 2rem;
      font-weight: 600;
      margin-bottom: 12px;
    }

    .cta-sub {
      color: #CBD5E1;
      margin-bottom: 32px;
    }

    .cta-form {
      display: flex;
      gap: 16px;
      justify-content: center;
      flex-wrap: wrap;
      max-width: 700px;
      margin: 0 auto;
    }

    .cta-input {
      background: transparent;
      border: none;
      border-bottom: 1px solid rgba(255,255,255,0.5);
      padding: 12px 8px;
      color: white;
      font-size: 1rem;
      outline: none;
      flex: 1;
      min-width: 160px;
    }

    .cta-input:focus {
      border-bottom-color: var(--accent);
    }

    .btn-gold {
      background: var(--accent);
      color: var(--primary);
      font-weight: 700;
      padding: 12px 36px;
      border-radius: var(--radius-btn);
      border: none;
      cursor: pointer;
    }

    @media (max-width: 640px) {
      .cta-form {
        flex-direction: column;
      }
    }

    /* 页脚 */
    .footer {
      background: #0F2440;
      color: #CBD5E1;
      padding: 64px 0 32px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }

    .footer-logo {
      font-size: 20px;
      font-weight: 700;
      color: white;
      margin-bottom: 12px;
    }

    .footer a {
      color: #94A3B8;
      display: block;
      margin-bottom: 8px;
    }

    .footer a:hover {
      color: var(--accent);
    }

    .copyright {
      border-top: 1px solid rgba(255,255,255,0.1);
      padding-top: 24px;
      text-align: center;
      font-size: 0.75rem;
      color: #94A3B8;
    }

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