/* roulang page: index */
:root {
      --primary: #1A1F36;
      --accent-gold: #C5A86C;
      --bg-warm: #FAFAF8;
      --cta-orange: #E85D3A;
      --text-dark: #2C2C2C;
      --text-muted: #5A5A5A;
      --white: #FFFFFF;
      --border-light: #E8E8E4;
      --shadow-sm: 0 4px 20px rgba(26, 31, 54, 0.06);
      --shadow-hover: 0 8px 30px rgba(26, 31, 54, 0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --transition: 0.3s ease;
      --font-title: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --font-number: 'SF Pro Display', 'DIN', 'PingFang SC', sans-serif;
    }

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

    body {
      font-family: var(--font-body);
      background-color: var(--bg-warm);
      color: var(--text-dark);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航栏 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(250, 250, 248, 0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-light);
      z-index: 100;
      transition: background 0.3s;
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
      height: 70px;
    }

    .logo {
      font-family: var(--font-title);
      font-size: 22px;
      font-weight: 700;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 8px;
      letter-spacing: 0.5px;
    }

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

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

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

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

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 26px;
      color: var(--primary);
      cursor: pointer;
    }

    /* 移动端导航面板 */
    .mobile-menu {
      display: none;
      position: fixed;
      top: 70px;
      left: 0;
      width: 100%;
      background: var(--bg-warm);
      border-bottom: 1px solid var(--border-light);
      flex-direction: column;
      padding: 20px 24px;
      gap: 18px;
      z-index: 99;
    }

    .mobile-menu a {
      font-size: 17px;
      font-weight: 500;
      color: var(--primary);
      padding: 8px 0;
      border-bottom: 1px solid var(--border-light);
    }

    /* Hero */
    #hero {
      height: 100vh;
      min-height: 650px;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      display: flex;
      align-items: center;
      color: var(--white);
    }

    #hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(26, 31, 54, 0.85) 0%, rgba(26, 31, 54, 0.5) 100%);
    }

    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 700px;
    }

    .hero-content h1 {
      font-family: var(--font-title);
      font-size: 3rem;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 20px;
      color: white;
    }

    .hero-sub {
      font-size: 1.125rem;
      opacity: 0.9;
      max-width: 500px;
      margin-bottom: 36px;
      font-weight: 400;
    }

    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--cta-orange);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      border: none;
      cursor: pointer;
      transition: background 0.25s;
      display: inline-block;
    }

    .btn-primary:hover {
      background: #C94A2E;
      color: white;
    }

    .btn-ghost {
      border: 2px solid white;
      color: white;
      background: transparent;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all 0.25s;
    }

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

    .section {
      padding: 100px 0;
    }

    .section-title {
      font-family: var(--font-title);
      font-size: 2.25rem;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 16px;
    }

    .section-sub {
      color: var(--text-muted);
      font-size: 1.1rem;
      margin-bottom: 48px;
    }

    /* 服务卡片 */
    .service-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }

    .service-card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }

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

    .service-icon {
      width: 64px;
      height: 64px;
      background: #F5EFE6;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      color: var(--accent-gold);
      font-size: 28px;
    }

    .service-card h3 {
      font-family: var(--font-title);
      font-size: 1.5rem;
      font-weight: 600;
      margin-bottom: 10px;
    }

    .service-card p {
      color: var(--text-muted);
      margin-bottom: 20px;
      flex: 1;
    }

    .btn-outline-dark {
      border: 2px solid var(--primary);
      color: var(--primary);
      background: transparent;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: 0.25s;
      align-self: flex-start;
    }

    .btn-outline-dark:hover {
      background: var(--primary);
      color: white;
    }

    /* 优势数据 */
    .stats-row {
      display: flex;
      justify-content: space-around;
      background: #F2F0EB;
      border-radius: 20px;
      padding: 48px 24px;
      margin-top: 20px;
    }

    .stat-item {
      text-align: center;
    }

    .stat-number {
      font-family: var(--font-number);
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--primary);
    }

    .stat-unit {
      font-size: 1.2rem;
      color: var(--accent-gold);
    }

    /* 案例卡片 */
    .case-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(--shadow-sm);
      transition: var(--transition);
    }

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

    .case-img {
      position: relative;
      overflow: hidden;
      height: 200px;
    }

    .case-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s;
    }

    .case-card:hover .case-img img {
      transform: scale(1.04);
    }

    .case-overlay {
      position: absolute;
      inset: 0;
      background: rgba(26, 31, 54, 0.5);
      display: flex;
      align-items: center;
      justify-content: center;
      opacity: 0;
      transition: 0.3s;
      color: white;
      font-weight: 600;
    }

    .case-card:hover .case-overlay {
      opacity: 1;
    }

    .case-tag {
      background: #F5EFE6;
      color: var(--accent-gold);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      display: inline-block;
      margin: 16px 16px 4px;
    }

    .case-card h4 {
      margin: 0 16px 8px;
      font-weight: 600;
    }

    .case-desc {
      margin: 0 16px 16px;
      color: var(--text-muted);
      font-size: 0.9rem;
    }

    /* 流程 */
    .process-steps {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
    }

    .step {
      text-align: center;
      flex: 1;
      position: relative;
    }

    .step-num {
      width: 48px;
      height: 48px;
      background: var(--primary);
      color: white;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 16px;
      font-weight: 700;
      font-size: 1.3rem;
    }

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

    .accordion-title {
      padding: 20px 0;
      font-size: 1.1rem;
      font-weight: 500;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .accordion-content {
      padding-bottom: 20px;
      color: var(--text-muted);
      display: none;
    }

    .accordion-item.active .accordion-content {
      display: block;
    }

    /* 联系 */
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
    }

    .contact-info {
      background: var(--primary);
      color: #ddd;
      padding: 32px;
      border-radius: 16px;
    }

    .footer {
      background: var(--primary);
      color: #B0B3C1;
      padding: 48px 0 20px;
    }

    .footer a {
      color: #B0B3C1;
    }

    @media (max-width: 1024px) {
      .case-grid { grid-template-columns: repeat(2,1fr); }
    }

    @media (max-width: 640px) {
      .nav-links { display: none; }
      .menu-toggle { display: block; }
      .hero-content h1 { font-size: 2rem; }
      .service-grid, .case-grid, .contact-grid { grid-template-columns: 1fr; }
      .stats-row { flex-direction: column; gap: 28px; }
      .process-steps { flex-direction: column; gap: 30px; }
    }