/* roulang page: index */
/* ----- 设计变量与基础重置 ----- */
    :root {
      --primary: #8B4A3A;
      --primary-hover: #6E3A2E;
      --secondary: #2F3E34;
      --accent: #D49B3B;
      --bg: #FBF7F2;
      --white: #FFFFFF;
      --text-dark: #1E1E1E;
      --text-body: #3A3A3A;
      --text-muted: #7A7A7A;
      --text-light: #D4C5B2;
      --border: #E5DDD3;
      --card-shadow: 0 2px 16px rgba(0,0,0,0.04), 0 0 0 1px rgba(0,0,0,0.03);
      --card-hover-shadow: 0 8px 30px rgba(0,0,0,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --font-serif: 'Noto Serif SC', 'Times New Roman', serif;
      --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
      --spacing-section: 100px;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text-body);
      line-height: 1.8;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, h4 {
      font-family: var(--font-serif);
      color: var(--text-dark);
      margin-top: 0;
      line-height: 1.3;
      font-weight: 700;
    }

    h1 { font-size: 52px; }
    h2 { font-size: 36px; margin-bottom: 1rem; }
    h3 { font-size: 24px; font-weight: 600; }

    p {
      margin-bottom: 1.2rem;
      color: var(--text-body);
    }

    a {
      color: var(--primary);
      text-decoration: none;
      transition: color 0.2s;
    }

    a:hover {
      color: var(--primary-hover);
      text-decoration: none;
    }

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

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 按钮系统 */
    .btn {
      display: inline-block;
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 14px 32px;
      font-size: 16px;
      text-align: center;
      transition: all 0.25s ease;
      cursor: pointer;
      border: 2px solid transparent;
      font-family: var(--font-sans);
      letter-spacing: 0.3px;
      line-height: 1.2;
    }

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

    .btn-primary:hover {
      background: var(--primary-hover);
      border-color: var(--primary-hover);
      color: var(--white);
      transform: translateY(-1px);
      box-shadow: 0 6px 16px rgba(139,74,58,0.25);
    }

    .btn-secondary {
      background: transparent;
      color: var(--primary);
      border-color: var(--primary);
    }

    .btn-secondary:hover {
      background: rgba(139,74,58,0.08);
      color: var(--primary-hover);
      border-color: var(--primary-hover);
    }

    .btn-accent {
      background: var(--accent);
      color: var(--secondary);
      border-color: var(--accent);
      font-weight: 700;
    }

    .btn-accent:hover {
      background: #c48a2e;
      border-color: #c48a2e;
      color: var(--secondary);
      transform: scale(1.02);
    }

    /* 导航系统 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 40;
      background: rgba(251,247,242,0.92);
      backdrop-filter: blur(12px);
      height: 72px;
      display: flex;
      align-items: center;
      border-bottom: 1px solid transparent;
      transition: all 0.3s ease;
    }

    .site-header.scrolled {
      background: var(--bg);
      border-bottom: 1px solid var(--border);
      box-shadow: 0 4px 16px rgba(0,0,0,0.03);
    }

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

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

    .logo i {
      font-size: 24px;
      color: var(--accent);
    }

    .logo .badge {
      background: var(--accent);
      color: var(--secondary);
      font-size: 11px;
      font-weight: 700;
      padding: 2px 8px;
      border-radius: 20px;
      margin-left: 6px;
      font-family: var(--font-sans);
      letter-spacing: 0.4px;
      background: #f0d78c;
    }

    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
      list-style: none;
      margin: 0;
    }

    .nav-links a {
      font-weight: 500;
      font-size: 15px;
      color: var(--text-body);
      padding: 8px 0;
      border-bottom: 2px solid transparent;
      transition: 0.2s;
      font-family: var(--font-sans);
    }

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

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--primary);
    }

    /* 板块间距 */
    section {
      padding: var(--spacing-section) 0;
    }

    .section-title {
      text-align: center;
      margin-bottom: 60px;
    }

    .section-title h2 {
      margin-bottom: 16px;
    }

    .divider {
      width: 50px;
      height: 2px;
      background: var(--primary);
      margin: 12px auto 0;
      opacity: 0.5;
    }

    /* Hero 杂志双栏 */
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
      min-height: 80vh;
    }

    .hero-text {
      flex: 1 1 45%;
    }

    .hero-text h1 {
      margin-bottom: 20px;
    }

    .hero-text .sub {
      font-size: 18px;
      color: var(--text-body);
      margin-bottom: 32px;
      line-height: 1.7;
    }

    .hero-image {
      flex: 1 1 55%;
      position: relative;
    }

    .hero-image img {
      border-radius: 40% 60% 50% 50% / 50% 45% 55% 50%;
      box-shadow: 0 20px 40px rgba(0,0,0,0.08);
      border: 2px solid rgba(212,155,59,0.25);
      width: 100%;
      object-fit: cover;
      aspect-ratio: 4/3;
    }

    /* 亮点网格 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 40px;
    }

    .feature-item {
      padding: 20px 0 32px;
      border-bottom: 1px solid var(--border);
      transition: border-color 0.3s;
    }

    .feature-item:hover {
      border-bottom-color: var(--primary);
    }

    .feature-item i {
      font-size: 36px;
      color: var(--primary);
      margin-bottom: 16px;
    }

    .feature-item h3 {
      font-size: 22px;
      margin-bottom: 10px;
    }

    /* 案例瀑布流 */
    .masonry {
      columns: 3;
      column-gap: 28px;
    }

    .masonry .card {
      break-inside: avoid;
      margin-bottom: 28px;
      background: var(--white);
      border-radius: var(--radius-card);
      box-shadow: var(--card-shadow);
      overflow: hidden;
      transition: all 0.3s ease;
    }

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

    .card-img {
      width: 100%;
      height: auto;
      display: block;
      transition: transform 0.4s;
    }

    .card:hover .card-img {
      transform: scale(1.03);
    }

    .card-body {
      padding: 22px 24px;
    }

    .card-body h3 {
      font-size: 20px;
      margin-bottom: 8px;
    }

    .tag {
      display: inline-block;
      background: #F0EBE3;
      color: var(--primary);
      font-size: 13px;
      padding: 4px 12px;
      border-radius: 20px;
      font-weight: 500;
    }

    /* 方案对比表 */
    .compare-table {
      background: var(--white);
      border-radius: 16px;
      overflow: hidden;
      box-shadow: var(--card-shadow);
      display: flex;
      flex-wrap: wrap;
    }

    .plan-col {
      flex: 1 1 25%;
      padding: 24px 16px;
      text-align: center;
      border-right: 1px solid var(--border);
    }

    .plan-col:last-child { border-right: none; }
    .plan-col.featured {
      background: #FDF9F2;
      border-left: 4px solid var(--accent);
    }

    .plan-col h3 {
      margin-bottom: 16px;
    }

    /* FAQ */
    .accordion-item {
      border-bottom: 1px solid var(--border);
    }

    .accordion-btn {
      width: 100%;
      text-align: left;
      background: var(--bg);
      border: none;
      padding: 20px 8px;
      font-size: 18px;
      font-weight: 600;
      font-family: var(--font-serif);
      color: var(--text-dark);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }

    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      background: var(--white);
      padding: 0 8px;
    }

    .accordion-content p {
      padding: 16px 0;
    }

    .faq-icon {
      color: var(--primary);
    }

    /* CTA 通栏 */
    .cta-banner {
      background: var(--secondary);
      color: var(--bg);
      text-align: center;
      padding: 70px 20px;
      border-radius: 24px;
    }

    .cta-banner h2 {
      color: var(--bg);
    }

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

    .copyright {
      border-top: 1px solid var(--border);
      margin-top: 50px;
      padding-top: 24px;
      text-align: center;
      color: var(--text-muted);
      font-size: 14px;
    }

    @media (max-width: 1024px) {
      h1 { font-size: 40px; }
      h2 { font-size: 30px; }
      .features-grid { grid-template-columns: repeat(2,1fr); }
      .masonry { columns: 2; }
    }

    @media (max-width: 768px) {
      .menu-toggle { display: block; }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: var(--bg);
        flex-direction: column;
        padding: 20px;
        gap: 16px;
        box-shadow: 0 10px 20px rgba(0,0,0,0.05);
      }
      .nav-links.open { display: flex; }
      .hero-grid { flex-direction: column; }
      .hero-image { order: -1; }
      .features-grid { grid-template-columns: 1fr; }
      .masonry { columns: 1; }
      .compare-table { flex-direction: column; }
      .plan-col { border-right: none; border-bottom: 1px solid var(--border); }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      h1 { font-size: 34px; }
    }