/* roulang page: index */
:root {
      --primary-dark: #1A1A1A;
      --accent-gold: #C8A96E;
      --accent-gold-hover: #B8914E;
      --bg-warm: #FAFAF7;
      --card-bg: #FFFFFF;
      --border-light: #E8E4DD;
      --text-primary: #2C2C2C;
      --text-secondary: #5A5A5A;
      --text-footer: #B0B0B0;
      --white: #FFFFFF;
      --shadow-sm: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.08);
      --radius-card: 6px;
      --radius-btn: 4px;
      --transition-base: 0.25s ease;
      --font-serif: 'Noto Serif SC', 'Playfair Display', serif;
      --font-sans: 'Noto Sans SC', sans-serif;
      --font-number: 'Inter', 'Roboto', sans-serif;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--text-primary);
      line-height: 1.7;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
    }
    h1, h2, h3, h4 {
      font-family: var(--font-serif);
      font-weight: 700;
      color: var(--primary-dark);
    }
    .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(250,250,247,0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-light);
      z-index: 1000;
      padding: 12px 0;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .logo {
      font-family: 'Playfair Display', serif;
      font-style: italic;
      font-weight: 700;
      font-size: 24px;
      color: var(--primary-dark);
      text-decoration: none;
      letter-spacing: 0.5px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      font-family: var(--font-sans);
      font-weight: 400;
      font-size: 14px;
      letter-spacing: 0.5px;
      color: var(--primary-dark);
      text-decoration: none;
      position: relative;
      padding-bottom: 6px;
      transition: color var(--transition-base);
    }
    .nav-links a:hover {
      color: var(--accent-gold);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-gold);
      transition: width var(--transition-base);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .mega-trigger {
      cursor: pointer;
      font-weight: 500;
      color: var(--primary-dark);
    }
    .mega-panel {
      position: absolute;
      top: 100%;
      right: 0;
      width: 320px;
      background: var(--card-bg);
      box-shadow: 0 12px 32px rgba(0,0,0,0.1);
      border-radius: 8px;
      padding: 24px;
      display: none;
      opacity: 0;
      transform: translateY(-8px);
      transition: opacity 0.2s ease, transform 0.2s ease;
      z-index: 999;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }
    .mega-trigger:hover + .mega-panel,
    .mega-panel:hover {
      display: grid;
      opacity: 1;
      transform: translateY(0);
    }
    .mega-col h4 {
      font-size: 15px;
      font-weight: 600;
      margin-bottom: 12px;
      color: var(--primary-dark);
      border-bottom: 1px solid var(--border-light);
      padding-bottom: 6px;
    }
    .mega-col a {
      display: block;
      font-size: 13px;
      color: var(--text-secondary);
      text-decoration: none;
      margin-bottom: 8px;
      transition: color 0.2s;
    }
    .mega-col a:hover {
      color: var(--accent-gold);
    }
    .hamburger {
      display: none;
      font-size: 24px;
      background: none;
      border: none;
      color: var(--primary-dark);
      cursor: pointer;
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: rgba(250,250,247,0.98);
        padding: 24px;
        box-shadow: 0 8px 20px rgba(0,0,0,0.05);
      }
      .nav-links.active {
        display: flex;
      }
      .hamburger {
        display: block;
      }
      .mega-panel {
        width: 100%;
        left: 0;
        right: auto;
      }
    }
    /* Hero */
    .hero {
      min-height: 100vh;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      display: flex;
      align-items: center;
    }
    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(to top, rgba(26,26,26,0.85) 0%, transparent 70%);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 700px;
      margin-left: 8%;
      color: white;
    }
    .hero h1 {
      font-family: var(--font-serif);
      font-weight: 900;
      font-size: 56px;
      color: white;
      line-height: 1.2;
      margin-bottom: 24px;
      text-shadow: 0 2px 10px rgba(0,0,0,0.3);
    }
    .hero p {
      font-weight: 300;
      font-size: 20px;
      color: rgba(255,255,255,0.8);
      margin-bottom: 32px;
    }
    .btn-group {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent-gold);
      color: var(--primary-dark);
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      text-decoration: none;
      transition: background var(--transition-base);
      border: none;
      cursor: pointer;
    }
    .btn-primary:hover {
      background: var(--accent-gold-hover);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid white;
      color: white;
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      text-decoration: none;
      transition: all var(--transition-base);
    }
    .btn-outline:hover {
      background: white;
      color: var(--primary-dark);
    }
    @media (max-width: 640px) {
      .hero h1 {
        font-size: 42px;
      }
      .hero p {
        font-size: 16px;
      }
    }
    /* 通用区块 */
    section {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 70px 0;
      }
    }
    .section-title {
      font-size: 36px;
      font-weight: 900;
      margin-bottom: 16px;
      color: var(--primary-dark);
    }
    .section-desc {
      color: var(--text-secondary);
      font-size: 18px;
      margin-bottom: 48px;
    }
    /* 优势 */
    .advantage-grid {
      display: flex;
      gap: 40px;
      flex-wrap: wrap;
    }
    .advantage-item {
      flex: 1;
      min-width: 280px;
      display: flex;
      flex-direction: column;
      gap: 20px;
    }
    .advantage-item img {
      width: 100%;
      height: 240px;
      object-fit: cover;
      border-radius: var(--radius-card);
    }
    .advantage-text h3 {
      font-size: 28px;
      margin-bottom: 12px;
    }
    /* 服务 2x2 */
    .service-grid {
      display: grid;
      grid-template-columns: repeat(2,1fr);
      gap: 28px;
    }
    .service-card {
      background: var(--card-bg);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      transition: all var(--transition-base);
      position: relative;
      overflow: hidden;
    }
    .service-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-2px);
    }
    .service-card::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: 0;
      width: 100%;
      height: 3px;
      background: var(--accent-gold);
      transform: scaleX(0);
      transition: transform var(--transition-base);
    }
    .service-card:hover::after {
      transform: scaleX(1);
    }
    .service-icon {
      width: 48px;
      height: 48px;
      margin-bottom: 24px;
      color: var(--accent-gold);
      font-size: 40px;
    }
    .service-card h3 {
      font-size: 22px;
      margin-bottom: 12px;
    }
    @media (max-width: 768px) {
      .service-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 数据 */
    .stats-row {
      display: flex;
      justify-content: space-around;
      text-align: center;
      flex-wrap: wrap;
    }
    .stat-item {
      flex: 1;
      min-width: 200px;
    }
    .stat-number {
      font-family: var(--font-number);
      font-weight: 600;
      font-size: 48px;
      color: var(--accent-gold);
    }
    .stat-label {
      color: var(--text-secondary);
      margin-top: 8px;
    }
    /* 案例卡片 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
    }
    .case-card {
      height: 360px;
      border-radius: var(--radius-card);
      background-size: cover;
      background-position: center;
      position: relative;
      overflow: hidden;
      transition: transform 0.3s ease;
    }
    .case-card:hover {
      transform: scale(1.03);
    }
    .case-overlay {
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      padding: 24px;
      background: linear-gradient(to top, rgba(0,0,0,0.8), transparent);
      color: white;
    }
    .case-tag {
      background: var(--accent-gold);
      color: var(--primary-dark);
      padding: 4px 12px;
      border-radius: 4px;
      font-size: 12px;
      font-weight: 600;
      display: inline-block;
      margin-bottom: 8px;
    }
    @media (max-width: 1024px) {
      .case-grid {
        grid-template-columns: repeat(2,1fr);
      }
    }
    @media (max-width: 640px) {
      .case-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 流程 */
    .steps {
      display: flex;
      justify-content: space-between;
      flex-wrap: wrap;
    }
    .step {
      flex: 1;
      min-width: 200px;
      text-align: center;
      padding: 24px;
    }
    .step-number {
      font-family: var(--font-number);
      font-weight: 700;
      font-size: 40px;
      color: var(--accent-gold);
    }
    /* FAQ */
    .accordion-title {
      font-weight: 500;
      font-size: 16px;
      background: var(--bg-warm);
      border-bottom: 1px solid var(--border-light);
    }
    .accordion-content {
      padding: 20px;
      background: white;
      color: var(--text-secondary);
    }
    /* CTA 横幅 */
    .cta-banner {
      background: var(--primary-dark);
      text-align: center;
      padding: 80px 24px;
    }
    .cta-banner h2 {
      color: white;
      font-size: 36px;
      margin-bottom: 16px;
    }
    .cta-banner p {
      color: rgba(255,255,255,0.7);
      margin-bottom: 32px;
    }
    /* 页脚 */
    .site-footer {
      background: var(--primary-dark);
      color: var(--text-footer);
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .footer-brand {
      font-family: 'Playfair Display', serif;
      font-style: italic;
      color: white;
      font-size: 24px;
    }
    .footer-links a {
      display: block;
      color: var(--text-footer);
      text-decoration: none;
      margin-bottom: 8px;
    }
    .footer-links a:hover {
      color: var(--accent-gold);
    }
    .social-icons i {
      font-size: 20px;
      margin-right: 16px;
      color: var(--text-footer);
      transition: color 0.2s;
    }
    .social-icons i:hover {
      color: var(--accent-gold);
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    .copyright {
      border-top: 1px solid #333;
      margin-top: 40px;
      padding-top: 20px;
      text-align: center;
      font-size: 14px;
    }