/* roulang page: index */
:root {
      --primary-warm-gold: #C8A882;
      --secondary-deep-rock: #2B2B2B;
      --bg-warm-white: #FAF7F2;
      --accent-amber: #D4843A;
      --text-dark: #3A3A3A;
      --text-muted: #6B625A;
      --border-light: #E5DDD2;
      --card-shadow: 0 2px 12px rgba(0,0,0,0.04);
      --card-hover-shadow: 0 8px 24px rgba(0,0,0,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --transition: 0.3s ease;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
      --font-number: "Inter", "Segoe UI", sans-serif;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm-white);
      color: var(--text-dark);
      line-height: 1.7;
      font-weight: 400;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .section-padding {
      padding: 80px 0;
    }
    @media (max-width: 768px) {
      .section-padding {
        padding: 60px 0;
      }
      .container {
        padding: 0 20px;
      }
    }
    /* 导航卡片面板 */
    #header-nav {
      position: fixed;
      top: 20px;
      left: 50%;
      transform: translateX(-50%);
      width: calc(100% - 48px);
      max-width: 1200px;
      z-index: 100;
      background: rgba(250, 247, 242, 0.9);
      backdrop-filter: blur(12px);
      border: 1px solid var(--border-light);
      border-radius: 16px;
      box-shadow: var(--card-shadow);
      padding: 12px 28px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      transition: background 0.3s, box-shadow 0.3s;
    }
    .nav-brand {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 20px;
      color: var(--secondary-deep-rock);
      letter-spacing: 0.5px;
    }
    .nav-logo-icon {
      font-size: 28px;
      color: var(--primary-warm-gold);
    }
    .nav-cards {
      display: flex;
      gap: 8px;
      flex-wrap: wrap;
    }
    .nav-card-item {
      background: transparent;
      padding: 8px 16px;
      border-radius: 30px;
      font-size: 15px;
      font-weight: 500;
      color: var(--text-dark);
      display: flex;
      align-items: center;
      gap: 6px;
      transition: var(--transition);
      border: 1px solid transparent;
    }
    .nav-card-item i {
      color: var(--primary-warm-gold);
    }
    .nav-card-item:hover {
      border-color: var(--primary-warm-gold);
      background: rgba(200,168,130,0.05);
      color: var(--secondary-deep-rock);
    }
    .nav-cta {
      background: var(--accent-amber);
      color: white;
      padding: 10px 22px;
      border-radius: 30px;
      font-weight: 600;
      font-size: 15px;
      border: none;
      transition: var(--transition);
      white-space: nowrap;
    }
    .nav-cta:hover {
      background: #B86E2E;
      box-shadow: 0 4px 12px rgba(212,132,58,0.4);
      color: white;
    }
    .hamburger {
      display: none;
      font-size: 24px;
      background: none;
      border: none;
      color: var(--secondary-deep-rock);
    }
    @media (max-width: 1024px) {
      .nav-cards {
        display: none;
      }
      .hamburger {
        display: block;
      }
      #header-nav {
        padding: 12px 20px;
      }
    }
    /* 移动端菜单 */
    .mobile-menu {
      display: none;
      position: fixed;
      top: 90px;
      left: 24px;
      right: 24px;
      background: white;
      border-radius: 20px;
      box-shadow: var(--card-hover-shadow);
      padding: 20px;
      flex-direction: column;
      gap: 12px;
      z-index: 99;
    }
    .mobile-menu a {
      display: block;
      padding: 12px 16px;
      background: var(--bg-warm-white);
      border-radius: 12px;
      font-weight: 500;
    }
    /* Hero */
    #hero {
      padding-top: 140px;
      padding-bottom: 80px;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
    }
    .hero-left {
      flex: 1.2;
    }
    .hero-right {
      flex: 0.8;
      position: relative;
    }
    .hero-right img {
      border-radius: 24px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.08);
    }
    h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      color: var(--secondary-deep-rock);
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-muted);
      margin-bottom: 32px;
    }
    .btn-primary {
      background: var(--accent-amber);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      display: inline-block;
      letter-spacing: 0.5px;
      transition: var(--transition);
    }
    .btn-primary:hover {
      background: #B86E2E;
      transform: translateY(-2px);
      box-shadow: 0 8px 18px rgba(212,132,58,0.3);
      color: white;
    }
    .btn-secondary {
      border: 1px solid var(--secondary-deep-rock);
      color: var(--secondary-deep-rock);
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      margin-left: 16px;
      transition: var(--transition);
    }
    .btn-secondary:hover {
      background: var(--secondary-deep-rock);
      color: white;
    }
    @media (max-width: 768px) {
      .hero-grid {
        flex-direction: column;
        gap: 40px;
      }
      h1 {
        font-size: 36px;
      }
      .btn-secondary {
        margin-left: 0;
        margin-top: 12px;
      }
    }
    /* 亮点网格 */
    .highlights-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
    }
    .highlight-card {
      background: white;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--card-shadow);
      transition: var(--transition);
    }
    .highlight-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-hover-shadow);
    }
    .highlight-icon {
      font-size: 32px;
      color: var(--primary-warm-gold);
      margin-bottom: 16px;
    }
    @media (max-width: 768px) {
      .highlights-grid {
        grid-template-columns: repeat(2,1fr);
      }
    }
    @media (max-width: 520px) {
      .highlights-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 案例瀑布 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
    }
    .case-card {
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--card-shadow);
      transition: var(--transition);
    }
    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-hover-shadow);
    }
    .case-img {
      overflow: hidden;
      height: 220px;
    }
    .case-img img {
      transition: transform 0.3s;
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .case-card:hover .case-img img {
      transform: scale(1.03);
    }
    .case-content {
      padding: 20px;
    }
    .tag {
      background: #f0ebe2;
      color: var(--text-muted);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 13px;
    }
    @media (max-width: 768px) {
      .cases-grid {
        grid-template-columns: repeat(2,1fr);
      }
    }
    @media (max-width: 520px) {
      .cases-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 方案对比 */
    .compare-row {
      display: flex;
      gap: 24px;
      align-items: stretch;
    }
    .compare-card {
      background: white;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      padding: 36px 28px;
      flex: 1;
      box-shadow: var(--card-shadow);
    }
    .compare-card.recommended {
      border-color: var(--primary-warm-gold);
      position: relative;
    }
    .badge {
      background: var(--primary-warm-gold);
      color: white;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 12px;
    }
    .compare-list {
      list-style: none;
      margin: 20px 0;
    }
    .compare-list li {
      padding: 8px 0;
      border-bottom: 1px solid var(--border-light);
    }
    @media (max-width: 768px) {
      .compare-row {
        flex-direction: column;
      }
    }
    /* FAQ */
    .accordion-item {
      background: white;
      border: 1px solid var(--border-light);
      border-radius: 12px;
      margin-bottom: 12px;
    }
    .accordion-title {
      font-weight: 600;
      padding: 18px 24px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease-in-out;
      padding: 0 24px;
    }
    /* CTA */
    #cta-section {
      background: #F5EFE8;
      text-align: center;
    }
    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
      color: #D0C8BE;
    }
    .footer-brand {
      font-weight: 700;
      font-size: 20px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }