/* roulang page: index */
:root {
      --primary: #0B3D2E;
      --primary-soft: #0A2E24;
      --accent: #F5A623;
      --accent-hover: #E09515;
      --bg: #F9FAFB;
      --card-bg: #FFFFFF;
      --text: #1F2937;
      --text-light: #6B7280;
      --border-light: rgba(11,61,46,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --shadow-card: 0 2px 8px rgba(11,61,46,0.06);
      --shadow-hover: 0 8px 24px rgba(11,61,46,0.12);
      --font-heading: 'PingFang SC', 'Noto Sans SC', 'Helvetica Neue', sans-serif;
      --font-body: 'Inter', 'PingFang SC', 'Noto Sans SC', sans-serif;
      --font-data: 'DIN Alternate', 'Inter', sans-serif;
    }

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

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

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航 */
    .navbar {
      position: sticky;
      top: 0;
      z-index: 100;
      backdrop-filter: blur(12px);
      background: rgba(255,255,255,0.92);
      border-bottom: 1px solid var(--border-light);
      padding: 0 24px;
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
      max-width: 1280px;
      margin: 0 auto;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--primary);
      text-decoration: none;
      letter-spacing: 0.5px;
    }

    .logo i {
      font-size: 2rem;
      color: var(--accent);
    }

    .nav-links {
      display: flex;
      gap: 2rem;
      align-items: center;
    }

    .nav-links a {
      text-decoration: none;
      color: var(--text);
      font-weight: 500;
      font-size: 0.95rem;
      padding: 4px 0;
      border-bottom: 3px solid transparent;
      transition: 0.2s;
    }

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

    .btn-primary {
      background: var(--accent);
      color: white;
      font-weight: 600;
      padding: 0.65rem 1.5rem;
      border-radius: var(--radius-btn);
      border: none;
      cursor: pointer;
      font-size: 0.95rem;
      transition: 0.2s;
      text-decoration: none;
      display: inline-block;
      white-space: nowrap;
    }

    .btn-primary:hover {
      background: var(--accent-hover);
      transform: translateY(-1px);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      font-weight: 600;
      padding: 0.6rem 1.5rem;
      border-radius: var(--radius-btn);
      transition: 0.2s;
      text-decoration: none;
      display: inline-block;
    }

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

    .btn-ghost {
      background: transparent;
      border: 2px solid white;
      color: white;
      font-weight: 600;
      padding: 0.65rem 2rem;
      border-radius: var(--radius-btn);
      transition: 0.2s;
      text-decoration: none;
    }
    .btn-ghost:hover {
      background: rgba(255,255,255,0.15);
    }

    .hamburger {
      display: none;
      font-size: 1.8rem;
      cursor: pointer;
      color: var(--primary);
    }

    /* Hero */
    #hero {
      background: linear-gradient(135deg, rgba(11,61,46,0.82) 0%, rgba(10,46,36,0.9) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 85vh;
      display: flex;
      align-items: center;
      color: white;
      position: relative;
      overflow: hidden;
    }

    .hero-content {
      max-width: 700px;
      animation: fadeUp 0.8s ease;
    }
    .hero-content h1 {
      font-family: var(--font-heading);
      font-size: 3.2rem;
      font-weight: 700;
      line-height: 1.3;
      margin-bottom: 1.5rem;
    }
    .hero-sub {
      font-size: 1.15rem;
      margin-bottom: 2rem;
      color: rgba(255,255,255,0.85);
    }
    .hero-btns {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }

    @keyframes fadeUp {
      from { opacity: 0; transform: translateY(30px); }
      to { opacity: 1; transform: translateY(0); }
    }

    /* 板块通用 */
    section {
      padding: 80px 0;
    }
    .section-title {
      font-family: var(--font-heading);
      font-size: 2.2rem;
      font-weight: 600;
      color: var(--primary);
      margin-bottom: 1rem;
    }
    .section-sub {
      color: var(--text-light);
      margin-bottom: 3rem;
    }

    /* 核心优势 */
    .advantages-grid {
      display: grid;
      grid-template-columns: 1fr 1fr 1fr;
      gap: 2rem;
    }
    .adv-card {
      background: var(--card-bg);
      padding: 2rem 1.5rem;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: 0.25s;
      border-bottom: 3px solid var(--accent);
      text-align: center;
    }
    .adv-card:nth-child(2) { margin-top: -20px; }
    .adv-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }
    .adv-icon {
      font-size: 2.4rem;
      color: var(--accent);
      margin-bottom: 1.2rem;
    }

    /* 服务矩阵 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }
    .service-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: all 0.25s;
    }
    .service-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-hover);
    }
    .service-img {
      height: 180px;
      background-size: cover;
      background-position: center;
      position: relative;
    }
    .service-img .overlay {
      background: linear-gradient(0deg, rgba(11,61,46,0.75) 0%, transparent 70%);
      position: absolute;
      bottom: 0;
      width: 100%;
      padding: 1rem;
      color: white;
      font-weight: 600;
    }
    .service-body {
      padding: 1.2rem;
    }
    .service-body p {
      color: var(--text-light);
      font-size: 0.9rem;
    }
    .link-accent {
      color: var(--accent);
      font-weight: 600;
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    /* 数据深色区 */
    #stats {
      background: var(--primary-soft);
      color: white;
    }
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      text-align: center;
      gap: 1.5rem;
    }
    .stat-number {
      font-family: var(--font-data);
      font-size: 3rem;
      font-weight: 700;
      color: var(--accent);
    }

    /* 案例横向滚动 */
    .cases-scroll {
      display: flex;
      gap: 1.5rem;
      overflow-x: auto;
      padding-bottom: 1rem;
      scroll-snap-type: x mandatory;
    }
    .case-card {
      min-width: 300px;
      flex: 0 0 auto;
      border-radius: var(--radius-card);
      overflow: hidden;
      background: white;
      box-shadow: var(--shadow-card);
      scroll-snap-align: start;
      transition: 0.2s;
    }
    .case-card:hover { box-shadow: var(--shadow-hover); }
    .case-img {
      height: 200px;
      background-size: cover;
      position: relative;
    }
    .case-info {
      padding: 1rem;
    }

    /* 方案 */
    .plans-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 2rem;
      align-items: start;
    }
    .plan-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 2rem;
      box-shadow: var(--shadow-card);
      border: 1px solid transparent;
    }
    .plan-popular {
      border: 2px solid var(--primary);
      transform: translateY(-8px);
      position: relative;
    }
    .badge {
      background: var(--accent);
      color: white;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
    }

    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 1.2rem;
    }
    .faq-item {
      background: #F0F4F3;
      border-radius: 8px;
      padding: 0.8rem 1.2rem;
      cursor: pointer;
    }
    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-light);
    }
    .faq-item.active .faq-answer {
      max-height: 150px;
      margin-top: 0.8rem;
    }

    /* CTA 横幅 */
    #cta {
      background: var(--primary-soft);
      text-align: center;
      color: white;
    }

    /* 页脚 */
    footer {
      background: white;
      padding: 3rem 0;
      border-top: 1px solid var(--border-light);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 2rem;
    }

    @media (max-width: 1024px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      .advantages-grid { grid-template-columns: 1fr 1fr; }
      .services-grid { grid-template-columns: 1fr 1fr; }
      .plans-grid { grid-template-columns: 1fr; }
      .stats-grid { grid-template-columns: 1fr 1fr; }
      .faq-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }

    @media (max-width: 768px) {
      .hero-content h1 { font-size: 2rem; }
      .advantages-grid { grid-template-columns: 1fr; }
      .services-grid { grid-template-columns: 1fr; }
      .stats-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
    }

    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.98);
      backdrop-filter: blur(16px);
      flex-direction: column;
      padding: 2rem;
      gap: 1.3rem;
      z-index: 99;
    }
    .mobile-menu.active { display: flex; }