/* roulang page: index */
/* ----- 设计变量 & 全局重置 ----- */
    :root {
      --deep-blue: #1B2A4A;
      --rose-gold: #C49A6C;
      --warm-white: #F7F5F2;
      --burgundy: #8B3A3A;
      --burgundy-dark: #6F2E2E;
      --card-bg: #FFFFFF;
      --border-light: #E5E0D9;
      --text-primary: #1B2A4A;
      --text-secondary: #4A4A4A;
      --text-muted: #6B6B6B;
      --shadow-sm: 0 4px 20px rgba(27, 42, 74, 0.08);
      --shadow-md: 0 8px 30px rgba(27, 42, 74, 0.12);
      --shadow-lg: 0 12px 40px rgba(27, 42, 74, 0.16);
      --radius-sm: 8px;
      --radius-md: 16px;
      --radius-lg: 24px;
      --transition: 0.25s ease;
      --max-width: 1280px;
      --header-height: 72px;
    }

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

    body {
      font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
      background-color: var(--warm-white);
      color: var(--text-primary);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
      padding-top: var(--header-height);
    }

    h1, h2, h3 {
      font-family: 'Noto Serif SC', 'Times New Roman', serif;
      font-weight: 700;
      line-height: 1.25;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition);
    }

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 40px;
    }

    /* ----- 导航系统 (桌面固定顶部 + 移动端底部胶囊) ----- */
    .main-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--header-height);
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      box-shadow: 0 1px 8px rgba(0,0,0,0.03);
      z-index: 1000;
      display: flex;
      align-items: center;
      border-bottom: 1px solid var(--border-light);
    }

    .header-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-family: 'Noto Serif SC', serif;
      font-weight: 700;
      font-size: 1.6rem;
      color: var(--deep-blue);
      letter-spacing: 0.5px;
    }
    .logo i {
      color: var(--rose-gold);
      font-size: 1.9rem;
    }

    .desktop-nav {
      display: flex;
      gap: 2.5rem;
      align-items: center;
    }
    .desktop-nav a {
      font-weight: 500;
      font-size: 0.95rem;
      color: var(--text-primary);
      position: relative;
      padding: 6px 0;
      white-space: nowrap;
    }
    .desktop-nav a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--rose-gold);
      transition: width 0.3s ease;
    }
    .desktop-nav a:hover::after,
    .desktop-nav a.active::after {
      width: 100%;
    }
    .desktop-nav a:hover {
      color: var(--deep-blue);
    }

    .mobile-nav {
      display: none;
      position: fixed;
      bottom: 12px;
      left: 50%;
      transform: translateX(-50%);
      width: calc(100% - 40px);
      max-width: 500px;
      background: rgba(27, 42, 74, 0.92);
      backdrop-filter: blur(24px);
      border-radius: 40px;
      padding: 8px 20px;
      justify-content: space-around;
      align-items: center;
      box-shadow: 0 10px 30px rgba(0,0,0,0.25);
      z-index: 1100;
      border: 1px solid rgba(255,255,255,0.15);
    }
    .mobile-nav a {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 4px;
      color: rgba(255,255,255,0.7);
      font-size: 0.7rem;
      font-weight: 500;
      transition: 0.2s;
      padding: 6px 8px;
      border-radius: 20px;
    }
    .mobile-nav a i {
      font-size: 1.2rem;
    }
    .mobile-nav a.active, .mobile-nav a:hover {
      color: white;
      background: rgba(196, 154, 108, 0.25);
    }

    /* ----- 通用区块 ----- */
    section {
      padding: 90px 0;
    }
    .section-title {
      font-size: 2.4rem;
      margin-bottom: 1rem;
      color: var(--deep-blue);
      text-align: center;
    }
    .section-sub {
      text-align: center;
      color: var(--text-muted);
      max-width: 620px;
      margin: 0 auto 3.5rem;
      font-size: 1.1rem;
    }

    /* ----- 按钮组件 ----- */
    .btn-primary {
      background: var(--burgundy);
      color: white;
      padding: 12px 32px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      transition: background 0.2s, transform 0.1s;
      box-shadow: 0 4px 12px rgba(139, 58, 58, 0.25);
    }
    .btn-primary:hover {
      background: var(--burgundy-dark);
      transform: translateY(-1px);
    }
    .btn-outline {
      border: 1.5px solid var(--deep-blue);
      color: var(--deep-blue);
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      background: transparent;
      transition: 0.2s;
    }
    .btn-outline:hover {
      background: rgba(27,42,74,0.05);
    }
    .btn-white-outline {
      border: 1.5px solid white;
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      background: transparent;
    }
    .btn-white-outline:hover {
      background: rgba(255,255,255,0.15);
    }

    /* ----- 卡片基础 ----- */
    .card {
      background: var(--card-bg);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }

    /* ========== 实际区块样式 ========== */
    /* Hero 双栏 */
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
      min-height: 75vh;
      padding-top: 20px;
    }
    .hero-left h1 {
      font-size: 3.5rem;
      font-weight: 700;
      color: var(--deep-blue);
      margin-bottom: 1.25rem;
      line-height: 1.2;
    }
    .hero-left .subtitle {
      font-size: 1.25rem;
      color: var(--text-secondary);
      margin-bottom: 2rem;
    }
    .hero-right img {
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-lg);
      width: 100%;
      aspect-ratio: 4/3;
      object-fit: cover;
      background: #d9d2c5;
    }

    /* 亮点网格 */
    .highlights-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }
    .highlight-card {
      text-align: center;
      padding: 2rem 1.8rem;
    }
    .badge-circle {
      width: 80px;
      height: 80px;
      background: var(--rose-gold);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 1.2rem;
      font-size: 2rem;
      font-weight: 700;
      color: white;
      font-family: 'Inter', sans-serif;
    }

    /* 案例瀑布流 (masonry) */
    .masonry {
      columns: 3;
      column-gap: 24px;
    }
    .masonry-item {
      break-inside: avoid;
      margin-bottom: 24px;
      border-radius: 12px;
      overflow: hidden;
      background: white;
      border: 1px solid var(--border-light);
      transition: 0.2s;
    }
    .masonry-item img {
      width: 100%;
      display: block;
      transition: transform 0.4s;
      object-fit: cover;
    }
    .masonry-item:hover img {
      transform: scale(1.03);
    }
    .masonry-text {
      padding: 1rem;
    }

    /* 方案对比 */
    .compare-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: start;
    }
    .plan-card {
      padding: 2.5rem;
      position: relative;
    }
    .recommend-badge {
      position: absolute;
      top: 16px;
      right: 16px;
      background: var(--burgundy);
      color: white;
      padding: 4px 18px;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 600;
    }

    /* FAQ 手风琴 */
    .faq-grid {
      display: grid;
      grid-template-columns: 280px 1fr;
      gap: 40px;
    }
    .faq-question-list {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .faq-q-item {
      padding: 14px 18px;
      border-radius: 8px;
      font-weight: 500;
      cursor: pointer;
      border-left: 4px solid transparent;
    }
    .faq-q-item.active {
      background: white;
      border-left: 4px solid var(--rose-gold);
      font-weight: 600;
    }

    /* CTA 横幅 */
    .cta-band {
      background: linear-gradient(135deg, #1B2A4A 0%, #8B3A3A 100%);
      border-radius: 32px;
      padding: 70px 40px;
      text-align: center;
      color: white;
    }

    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
      color: #ddd;
    }

    /* ----- 响应式处理 ----- */
    @media (max-width: 1024px) {
      .container { padding: 0 28px; }
      .hero-grid { gap: 30px; }
      .masonry { columns: 2; }
    }
    @media (max-width: 768px) {
      .desktop-nav { display: none; }
      .mobile-nav { display: flex; }
      body { padding-bottom: 80px; }
      .hero-grid { grid-template-columns: 1fr; text-align: center; }
      .hero-left h1 { font-size: 2.8rem; }
      .highlights-grid { grid-template-columns: 1fr; }
      .masonry { columns: 1; }
      .compare-row { grid-template-columns: 1fr; }
      .faq-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 520px) {
      .footer-grid { grid-template-columns: 1fr; }
      .section-title { font-size: 2rem; }
    }