/* roulang page: index */
:root {
      --primary-deep: #2D2A26;
      --accent-red: #8B3A3A;
      --accent-gold: #C4A97D;
      --bg-warm: #F5F4F1;
      --text-main: #1C1B1A;
      --text-soft: #6B6763;
      --border-light: #EBE9E5;
      --white: #FFFFFF;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --radius-card: 10px;
      --radius-btn: 6px;
      --transition: 0.25s ease;
    }

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

    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', 'Inter', system-ui, -apple-system, sans-serif;
      color: var(--text-main);
      background: var(--white);
      line-height: 1.8;
      font-size: 16px;
      scroll-behavior: smooth;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3 {
      font-family: 'Noto Serif SC', 'Songti SC', '宋体', 'Times New Roman', serif;
      font-weight: 700;
      color: var(--primary-deep);
    }

    h1 {
      font-size: 3.4rem;
      line-height: 1.2;
      letter-spacing: -0.5px;
    }

    h2 {
      font-size: 2.2rem;
      margin-bottom: 1.5rem;
      letter-spacing: 0.5px;
    }

    h3 {
      font-size: 1.25rem;
      font-weight: 600;
      margin-bottom: 0.75rem;
    }

    p {
      color: var(--text-soft);
    }

    a {
      transition: var(--transition);
      text-decoration: none;
      color: inherit;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 2rem;
    }

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 40;
      backdrop-filter: blur(6px);
      background: transparent;
      transition: background 0.3s, box-shadow 0.3s;
    }

    .site-header.scrolled {
      background: rgba(255,255,255,0.96);
      box-shadow: 0 1px 0 var(--border-light);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 1.2rem 2rem;
    }

    .logo {
      font-family: 'Noto Serif SC', serif;
      font-weight: 700;
      font-size: 1.6rem;
      letter-spacing: 1px;
      color: var(--primary-deep);
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }

    .logo-icon {
      display: inline-flex;
      width: 24px;
      height: 24px;
      border: 2px solid var(--accent-gold);
      border-radius: 50%;
      position: relative;
      background: transparent;
    }

    .logo-icon::before,
    .logo-icon::after {
      content: '';
      position: absolute;
      background: var(--accent-gold);
      width: 2px;
      height: 12px;
      top: 4px;
      left: 9px;
      border-radius: 2px;
    }

    .logo-icon::after {
      transform: rotate(90deg);
      height: 10px;
      top: 5px;
    }

    .nav-links {
      display: flex;
      gap: 1.8rem;
      align-items: center;
    }

    .nav-links a {
      color: var(--primary-deep);
      font-weight: 500;
      font-size: 1rem;
      position: relative;
      padding: 0.2rem 0;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-gold);
      transition: width 0.25s;
    }

    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }

    .lang-hint {
      color: var(--text-soft);
      margin-left: 0.5rem;
      font-size: 0.9rem;
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
    }

    .menu-toggle span {
      width: 24px;
      height: 2px;
      background: var(--primary-deep);
      border-radius: 2px;
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      background: linear-gradient(135deg, rgba(196,169,125,0.08) 0%, rgba(45,42,38,0.65) 85%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      display: flex;
      align-items: center;
      padding-top: 5rem;
    }

    .hero-content {
      max-width: 650px;
      color: white;
      margin-top: -2rem;
    }

    .hero h1 {
      color: white;
      text-shadow: 0 2px 12px rgba(0,0,0,0.3);
    }

    .hero-sub {
      font-size: 1.2rem;
      color: rgba(255,255,255,0.85);
      margin: 1.8rem 0 2.5rem;
      line-height: 1.7;
    }

    .btn-primary {
      background: var(--accent-red);
      color: white;
      padding: 0.9rem 2.5rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      display: inline-block;
      border: none;
      transition: 0.2s;
      font-size: 1rem;
      letter-spacing: 0.3px;
    }

    .btn-primary:hover {
      background: #6E2E2E;
      color: white;
      transform: scale(1.02);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--accent-red);
      color: var(--accent-red);
      padding: 0.8rem 2rem;
      border-radius: var(--radius-btn);
      font-weight: 500;
      display: inline-block;
    }

    .btn-outline:hover {
      background: rgba(139,58,58,0.05);
    }

    .hero-link {
      color: rgba(255,255,255,0.9);
      margin-left: 1.8rem;
      border-bottom: 1px solid var(--accent-gold);
      font-weight: 500;
    }

    /* 板块间距 */
    section {
      padding: 7rem 0;
    }

    .bg-warm {
      background: var(--bg-warm);
    }

    .section-title {
      text-align: center;
      margin-bottom: 3.5rem;
    }

    /* 核心价值 */
    .value-text {
      max-width: 720px;
      margin: 0 auto;
      font-size: 1.3rem;
      line-height: 2;
      color: var(--primary-deep);
      text-align: center;
    }

    /* 功能卡片 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }

    .func-card {
      background: var(--white);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      padding: 2rem 1.8rem;
      transition: var(--transition);
    }

    .func-card:hover {
      border-color: var(--accent-gold);
      box-shadow: var(--shadow-sm);
      transform: translateY(-2px);
    }

    .func-icon {
      font-size: 2rem;
      color: var(--accent-gold);
      margin-bottom: 1.5rem;
    }

    /* 场景卡片 */
    .scene-row {
      display: flex;
      align-items: center;
      gap: 3rem;
      margin-bottom: 3.5rem;
    }

    .scene-img {
      flex: 1;
      border-radius: 12px;
      overflow: hidden;
      transition: transform 0.3s;
    }

    .scene-img img {
      width: 100%;
      height: auto;
      display: block;
      object-fit: cover;
      aspect-ratio: 4/3;
    }

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

    .scene-text {
      flex: 1;
    }

    /* 案例数字 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }

    .stat-card {
      background: #F9F8F6;
      border-radius: var(--radius-card);
      padding: 2.5rem 1.5rem;
      text-align: center;
    }

    .stat-number {
      font-size: 3.2rem;
      font-weight: 700;
      color: var(--accent-red);
      line-height: 1.1;
    }

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

    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 1.3rem 0;
      font-weight: 600;
      font-size: 1.1rem;
      cursor: pointer;
      color: var(--primary-deep);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-soft);
      line-height: 2;
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 1.5rem;
    }

    .faq-icon {
      color: var(--accent-gold);
      font-weight: 300;
      font-size: 1.4rem;
    }

    /* CTA */
    .cta-section {
      background: var(--accent-red);
      color: white;
      text-align: center;
    }

    .cta-section h2 {
      color: white;
    }

    .contact-form {
      max-width: 500px;
      margin: 2rem auto 0;
      display: flex;
      flex-direction: column;
      gap: 1rem;
    }

    .contact-form input,
    .contact-form textarea {
      background: rgba(255,255,255,0.95);
      border: none;
      padding: 0.9rem 1.2rem;
      border-radius: var(--radius-btn);
      font-size: 1rem;
    }

    .footer {
      background: var(--bg-warm);
      border-top: 1px solid var(--accent-gold);
      padding: 3rem 0 2rem;
      font-size: 0.9rem;
      color: var(--text-soft);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 2rem;
    }

    @media (max-width: 1024px) {
      .grid-3, .stats-grid { grid-template-columns: repeat(2, 1fr); }
      .scene-row { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }

    @media (max-width: 640px) {
      h1 { font-size: 2.2rem; }
      h2 { font-size: 1.8rem; }
      .nav-links { display: none; }
      .menu-toggle { display: flex; }
      .grid-3, .stats-grid { grid-template-columns: 1fr; }
      .hero { min-height: 80vh; }
      section { padding: 4.5rem 0; }
    }