/* roulang page: index */
:root {
      --primary: #0B4F6C;
      --primary-hover: #083D52;
      --primary-soft: #E6F0F4;
      --accent: #C49A2C;
      --accent-light: #f7e9c9;
      --bg: #F7F5F2;
      --white: #FFFFFF;
      --card-hover-bg: #FEFCF9;
      --text-main: #1A1A1A;
      --text-body: #3A3A3A;
      --text-muted: #6B6B6B;
      --success: #1B7A4A;
      --border-light: #e0ded9;
      --shadow-sm: 0 2px 12px rgba(0,0,0,0.04), 0 1px 3px rgba(0,0,0,0.03);
      --shadow-hover: 0 8px 28px rgba(0,0,0,0.08), 0 2px 6px rgba(0,0,0,0.04);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", "Inter", system-ui, sans-serif;
      --transition: 0.2s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text-body);
      line-height: 1.7;
      font-size: 15px;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    img {
      max-width: 100%;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition);
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: transparent;
    }
    /* 导航 */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 68px;
      background: var(--white);
      border-bottom: 1px solid var(--border-light);
      z-index: 50;
      display: flex;
      align-items: center;
      justify-content: center;
      backdrop-filter: blur(8px);
      background: rgba(255,255,255,0.92);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: 1200px;
      padding: 0 24px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 20px;
      color: var(--primary);
      letter-spacing: 0.5px;
    }
    .logo-icon {
      width: 28px;
      height: 28px;
      background: var(--accent);
      mask: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><path d="M12 2L2 22h20L12 2z"/></svg>') center/contain no-repeat;
      background-color: var(--accent);
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      font-size: 14px;
      font-weight: 500;
      color: var(--text-body);
      position: relative;
      padding: 4px 0;
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .nav-cta {
      padding: 10px 22px;
      background: var(--primary);
      color: white;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 14px;
      transition: background var(--transition), transform 0.1s;
    }
    .nav-cta:hover {
      background: var(--primary-hover);
      transform: translateY(-1px);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
    }
    .hamburger span {
      width: 24px;
      height: 2.5px;
      background: var(--primary);
      border-radius: 2px;
      transition: 0.2s;
    }
    /* 移动端导航抽屉 */
    .drawer {
      position: fixed;
      top: 0;
      right: -100%;
      width: 75%;
      max-width: 300px;
      height: 100vh;
      background: var(--white);
      box-shadow: -8px 0 24px rgba(0,0,0,0.1);
      z-index: 100;
      padding: 24px;
      display: flex;
      flex-direction: column;
      gap: 32px;
      transition: right 0.3s ease;
    }
    .drawer.open {
      right: 0;
    }
    .drawer a {
      font-size: 16px;
      font-weight: 500;
      color: var(--text-main);
    }
    /* 区块通用 */
    section {
      padding: 80px 0;
    }
    .section-title {
      text-align: center;
      margin-bottom: 48px;
    }
    h2 {
      font-size: 32px;
      font-weight: 600;
      color: var(--text-main);
      line-height: 1.3;
      margin-bottom: 12px;
    }
    h3 {
      font-size: 22px;
      font-weight: 500;
      color: var(--text-muted);
      line-height: 1.4;
    }
    /* 卡片网格 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 28px 24px;
      box-shadow: var(--shadow-sm);
      transition: box-shadow 0.25s ease, transform 0.2s;
      display: flex;
      flex-direction: column;
    }
    .card:hover {
      box-shadow: var(--shadow-hover);
      background: var(--card-hover-bg);
      transform: translateY(-4px);
    }
    /* Hero */
    .hero {
      padding: 120px 0 80px;
      background: linear-gradient(135deg, #0B4F6C 0%, #083D52 100%);
      color: white;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 40px;
    }
    .hero-left {
      flex: 1;
    }
    .hero-right {
      flex: 1;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 360px;
      border-radius: 24px;
      position: relative;
      overflow: hidden;
    }
    .hero-right::after {
      content: '';
      position: absolute;
      inset: 0;
      background: rgba(11, 79, 108, 0.3);
    }
    h1 {
      font-size: 40px;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 16px;
      opacity: 0.9;
      margin-bottom: 32px;
      line-height: 1.6;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent);
      color: #1A1A1A;
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-size: 15px;
      transition: 0.2s;
      border: none;
    }
    .btn-primary:hover {
      background: #d9a82b;
    }
    .btn-outline-light {
      border: 1.5px solid white;
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      background: transparent;
    }
    /* 图标卡片 */
    .icon-circle {
      width: 56px;
      height: 56px;
      background: var(--primary-soft);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      color: var(--primary);
      font-size: 24px;
    }
    .card h4 {
      font-size: 18px;
      font-weight: 600;
      margin-bottom: 12px;
      color: var(--text-main);
    }
    /* 场景卡片 */
    .scene-img {
      aspect-ratio: 16 / 9;
      background: #ddd;
      border-radius: 8px;
      margin-bottom: 16px;
      object-fit: cover;
    }
    .accent-line {
      width: 40px;
      height: 2px;
      background: var(--accent);
      margin-top: 12px;
    }
    /* 案例区块 */
    .cases-bg {
      background: #F0EDE8;
    }
    .stats {
      display: flex;
      justify-content: center;
      gap: 60px;
      flex-wrap: wrap;
      margin-bottom: 48px;
    }
    .stat-number {
      font-size: 48px;
      font-weight: 700;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .testimonial-card {
      background: var(--white);
      padding: 28px;
      border-radius: var(--radius-card);
      display: flex;
      gap: 20px;
      align-items: center;
    }
    .quote {
      font-style: italic;
      color: var(--text-body);
    }
    /* 价格卡 */
    .pricing-highlight {
      border: 2px solid var(--accent);
      position: relative;
    }
    .badge {
      background: var(--accent);
      color: white;
      font-size: 12px;
      padding: 4px 12px;
      border-radius: 20px;
      position: absolute;
      top: -12px;
      right: 20px;
      font-weight: 600;
    }
    .price {
      font-size: 36px;
      font-weight: 700;
      color: var(--text-main);
      margin: 16px 0;
    }
    .feature-list {
      list-style: none;
      margin: 20px 0;
    }
    .feature-list li {
      margin-bottom: 10px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    /* FAQ */
    .faq-item {
      background: var(--white);
      border-radius: var(--radius-card);
      margin-bottom: 12px;
      padding: 0 24px;
      transition: 0.2s;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 20px 0;
      font-weight: 500;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-muted);
      font-size: 14px;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 20px;
    }
    /* 联系表单 */
    .contact-bg {
      background: var(--primary-soft);
    }
    .form-input {
      width: 100%;
      padding: 14px;
      border: 1px solid #D1D1D1;
      border-radius: var(--radius-input);
      margin-bottom: 16px;
      background: white;
      font-size: 14px;
    }
    .form-input:focus {
      outline: none;
      border-color: var(--primary);
    }
    .footer {
      background: #1A1A1A;
      color: #A0A0A0;
      padding: 48px 0 24px;
    }
    .footer a:hover {
      color: white;
    }
    @media (max-width: 1024px) {
      .grid-3 { grid-template-columns: repeat(2,1fr); }
      .grid-4 { grid-template-columns: repeat(2,1fr); }
      h1 { font-size: 36px; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .hero-grid { flex-direction: column; }
      .hero-right { min-height: 240px; width: 100%; }
      .grid-3, .grid-4 { grid-template-columns: 1fr; }
      .stats { gap: 24px; }
      h1 { font-size: 28px; }
      section { padding: 60px 0; }
    }