/* roulang page: index */
:root {
      --gold: #C8A96E;
      --gold-deep: #B08A4A;
      --ink: #1C1C1E;
      --ivory: #FAF8F5;
      --olive: #3A4A3F;
      --white: #FFFFFF;
      --border-light: #E8E4DC;
      --text-sub: rgba(28,28,30,0.65);
      --shadow-sm: 0 2px 8px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.08);
      --radius-sm: 6px;
      --radius-md: 8px;
      --transition: 0.25s ease;
      --serif: 'Noto Serif SC', 'Times New Roman', serif;
      --sans: 'Noto Sans SC', 'Inter', system-ui, -apple-system, sans-serif;
      --nav-height: 72px;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: var(--sans);
      background-color: var(--ivory);
      color: var(--ink);
      line-height: 1.7;
      font-size: 16px;
      overflow-x: hidden;
    }
    h1, h2, h3 {
      font-family: var(--serif);
      font-weight: 700;
      letter-spacing: 0.5px;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, .button {
      cursor: pointer;
      border: none;
      font-family: var(--sans);
      font-weight: 500;
      border-radius: var(--radius-sm);
      transition: all var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 0.75rem 2rem;
      font-size: 0.95rem;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 1.5rem;
    }
    /* 导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 40;
      background: var(--white);
      height: var(--nav-height);
      box-shadow: 0 1px 4px rgba(0,0,0,0.04);
      display: flex;
      align-items: center;
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 0.5rem;
      font-family: var(--serif);
      font-weight: 700;
      font-size: 1.4rem;
      color: var(--ink);
      letter-spacing: 1px;
      white-space: nowrap;
    }
    .logo i {
      font-size: 1.8rem;
      color: var(--gold);
    }
    .nav-links {
      display: flex;
      gap: 2rem;
      align-items: center;
      list-style: none;
    }
    .nav-links a {
      font-size: 0.9rem;
      font-weight: 500;
      color: var(--ink);
      letter-spacing: 0.5px;
      position: relative;
      padding: 0.25rem 0;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--gold);
      transition: width var(--transition);
    }
    .nav-links a:hover {
      color: var(--gold);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .search-box {
      display: flex;
      align-items: center;
      background: var(--ivory);
      border-radius: 2rem;
      padding: 0.5rem 1.2rem;
      border: 1px solid var(--border-light);
    }
    .search-box input {
      border: none;
      background: transparent;
      outline: none;
      font-size: 0.9rem;
      width: 140px;
      color: var(--ink);
      font-family: var(--sans);
    }
    .search-box i {
      color: var(--text-sub);
      font-size: 1rem;
    }
    .btn-primary {
      background: var(--gold);
      color: white;
      border-radius: var(--radius-sm);
      padding: 0.6rem 1.8rem;
      font-weight: 600;
      box-shadow: 0 2px 6px rgba(200,169,110,0.3);
      white-space: nowrap;
    }
    .btn-primary:hover {
      background: var(--gold-deep);
      box-shadow: 0 4px 12px rgba(176,138,74,0.4);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--gold);
      color: var(--gold);
      padding: 0.6rem 1.8rem;
      font-weight: 600;
    }
    .btn-outline:hover {
      background: rgba(200,169,110,0.08);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      padding: 0.5rem;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--ink);
      border-radius: 2px;
    }
    /* 移动端导航 */
    @media (max-width: 1024px) {
      .nav-links, .search-box {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .mobile-menu {
        position: fixed;
        top: var(--nav-height);
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: 2rem;
        box-shadow: var(--shadow-md);
        display: none;
        z-index: 50;
      }
      .mobile-menu.active {
        display: flex;
      }
      .mobile-menu a {
        padding: 0.8rem 0;
        border-bottom: 1px solid var(--border-light);
        font-size: 1.1rem;
      }
    }
    /* Hero */
    .hero {
      display: flex;
      align-items: center;
      padding: 4rem 0 5rem;
      background: var(--ivory);
    }
    .hero-content {
      flex: 1;
      padding-right: 2rem;
    }
    .hero-eyebrow {
      font-family: var(--serif);
      color: var(--gold);
      font-size: 0.9rem;
      letter-spacing: 3px;
      margin-bottom: 1rem;
      text-transform: uppercase;
    }
    .hero h1 {
      font-size: 3.2rem;
      line-height: 1.2;
      margin-bottom: 1.5rem;
      color: var(--ink);
    }
    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-sub);
      margin-bottom: 2rem;
      max-width: 480px;
    }
    .hero-image {
      flex: 1;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 380px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-md);
      position: relative;
    }
    .hero-image::after {
      content: '';
      position: absolute;
      inset: 0;
      background: rgba(28,28,30,0.1);
      border-radius: var(--radius-md);
    }
    @media (max-width: 768px) {
      .hero {
        flex-direction: column;
        text-align: center;
        padding: 2rem 0;
      }
      .hero-content {
        padding-right: 0;
        margin-bottom: 2rem;
      }
      .hero h1 {
        font-size: 2.4rem;
      }
      .hero-image {
        width: 100%;
        min-height: 280px;
      }
    }
    /* 通用板块 */
    .section {
      padding: 5rem 0;
    }
    .section-title {
      font-size: 2.2rem;
      margin-bottom: 0.8rem;
      text-align: center;
    }
    .section-sub {
      color: var(--text-sub);
      text-align: center;
      max-width: 620px;
      margin: 0 auto 3rem;
    }
    /* 核心优势 */
    .advantages-grid {
      display: flex;
      gap: 2rem;
      justify-content: center;
      flex-wrap: wrap;
    }
    .adv-card {
      background: var(--white);
      padding: 2rem 1.8rem;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-light);
      flex: 1 1 220px;
      text-align: center;
      transition: all 0.3s ease;
    }
    .adv-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .adv-icon {
      font-size: 2.2rem;
      color: var(--gold);
      margin-bottom: 1.2rem;
    }
    .adv-card h3 {
      font-size: 1.3rem;
      margin-bottom: 0.5rem;
    }
    /* 功能图文交替 */
    .feature-row {
      display: flex;
      align-items: center;
      gap: 3rem;
      margin-bottom: 5rem;
    }
    .feature-row.reverse {
      flex-direction: row-reverse;
    }
    .feature-text {
      flex: 1;
    }
    .feature-text h3 {
      font-size: 1.8rem;
      margin-bottom: 1rem;
    }
    .feature-text p {
      color: var(--text-sub);
      margin-bottom: 1.2rem;
    }
    .feature-img {
      flex: 1;
      border-radius: var(--radius-md);
      overflow: hidden;
      background: #ddd;
      height: 320px;
    }
    .feature-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    @media (max-width: 768px) {
      .feature-row, .feature-row.reverse {
        flex-direction: column;
      }
      .feature-img {
        height: 240px;
      }
    }
    /* 场景卡片 */
    .scenario-grid {
      display: flex;
      gap: 2rem;
      flex-wrap: wrap;
    }
    .scenario-card {
      background: var(--white);
      padding: 2rem;
      flex: 1 1 280px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-light);
      transition: all 0.3s ease;
    }
    .scenario-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    /* 案例数据 */
    .stats {
      display: flex;
      justify-content: center;
      gap: 3rem;
      flex-wrap: wrap;
      text-align: center;
    }
    .stat-number {
      font-size: 2.6rem;
      font-weight: 700;
      color: var(--gold);
      font-family: var(--serif);
    }
    /* FAQ */
    .accordion-item {
      border-bottom: 1px solid var(--border-light);
      margin-bottom: 0.5rem;
    }
    .accordion-title {
      font-size: 1.1rem;
      font-weight: 600;
      padding: 1.2rem 0;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-sub);
      padding-right: 1rem;
    }
    .accordion-content p {
      padding-bottom: 1.2rem;
    }
    /* 全局CTA */
    .cta-dark {
      background: var(--olive);
      color: white;
      text-align: center;
      padding: 4rem 0;
    }
    .cta-dark h2 {
      color: white;
    }
    .footer {
      background: var(--ink);
      color: #ddd;
      padding: 3rem 0 2rem;
      font-size: 0.9rem;
    }
    .footer-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 2rem;
      justify-content: space-between;
    }
    .footer a {
      color: #ccc;
      display: block;
      margin-bottom: 0.4rem;
    }
    .copyright {
      margin-top: 2rem;
      text-align: center;
      color: #888;
    }