/* roulang page: index */
:root {
      --primary-deep: #1C1C1E;
      --accent-gold: #C8A24B;
      --accent-gold-hover: #B08A32;
      --bg-warm: #F7F5F0;
      --white: #FFFFFF;
      --text-primary: #1C1C1E;
      --text-secondary: #555555;
      --text-on-dark: #E0E0E0;
      --border-light: #E5E0D5;
      --shadow-card: 0 2px 12px rgba(0,0,0,0.06);
      --shadow-card-hover: 0 8px 24px rgba(0,0,0,0.10);
      --radius-card: 12px;
      --radius-button: 8px;
      --transition: 0.25s ease;
      --container-max: 1280px;
      --font-display: 'Noto Serif SC', serif;
      --font-body: 'Inter', 'PingFang SC', system-ui, sans-serif;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-body);
      background-color: var(--bg-warm);
      color: var(--text-primary);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    .header {
      position: sticky;
      top: 0;
      z-index: 50;
      background: var(--white);
      box-shadow: 0 2px 8px rgba(0,0,0,0.04);
      padding: 0 24px;
    }
    .nav-bar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: var(--container-max);
      margin: 0 auto;
      height: 72px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-family: var(--font-display);
      font-weight: 700;
      font-size: 1.6rem;
      color: var(--primary-deep);
      letter-spacing: 1px;
    }
    .logo i {
      color: var(--accent-gold);
      font-size: 2rem;
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 30px;
    }
    .nav-link {
      font-weight: 500;
      font-size: 1rem;
      color: var(--text-primary);
      transition: color var(--transition);
      position: relative;
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--accent-gold);
      transition: width var(--transition);
    }
    .nav-link:hover {
      color: var(--accent-gold);
    }
    .nav-link:hover::after {
      width: 100%;
    }
    .btn-primary {
      background: var(--accent-gold);
      color: var(--white);
      padding: 12px 28px;
      border-radius: var(--radius-button);
      font-weight: 600;
      transition: background var(--transition), transform var(--transition);
      display: inline-block;
      border: none;
      cursor: pointer;
      font-size: 1rem;
      white-space: nowrap;
    }
    .btn-primary:hover {
      background: var(--accent-gold-hover);
      transform: translateY(-1px);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--accent-gold);
      color: var(--accent-gold);
      padding: 10px 26px;
      border-radius: var(--radius-button);
      font-weight: 600;
      transition: all var(--transition);
      display: inline-block;
      cursor: pointer;
    }
    .btn-outline:hover {
      background: rgba(200,162,75,0.08);
      border-color: var(--accent-gold-hover);
      color: var(--accent-gold-hover);
    }
    .hamburger {
      display: none;
      font-size: 1.8rem;
      cursor: pointer;
      color: var(--primary-deep);
    }
    @media (max-width: 768px) {
      .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 75%;
        max-width: 320px;
        height: 100vh;
        background: var(--white);
        flex-direction: column;
        padding: 100px 30px 40px;
        gap: 28px;
        box-shadow: -5px 0 20px rgba(0,0,0,0.1);
        transition: right 0.3s ease;
        align-items: flex-start;
      }
      .nav-menu.active {
        right: 0;
      }
      .hamburger {
        display: block;
        z-index: 55;
      }
      .nav-menu .btn-primary {
        width: 100%;
        text-align: center;
      }
    }
    /* Hero */
    .hero {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 40px;
      padding: 60px 0;
      background-color: var(--bg-warm);
    }
    .hero-content {
      flex: 1 1 50%;
    }
    .hero h1 {
      font-family: var(--font-display);
      font-size: 3rem;
      font-weight: 700;
      line-height: 1.2;
      color: var(--primary-deep);
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-secondary);
      margin-bottom: 32px;
      max-width: 500px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-image {
      flex: 1 1 45%;
      position: relative;
      border-radius: 20px;
      overflow: hidden;
      box-shadow: 0 20px 30px rgba(0,0,0,0.15);
    }
    .hero-image img {
      width: 100%;
      height: auto;
      object-fit: cover;
    }
    .gold-overlay {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: linear-gradient(135deg, rgba(200,162,75,0.15) 0%, rgba(28,28,30,0.2) 100%);
    }
    @media (max-width: 768px) {
      .hero {
        flex-direction: column;
        text-align: center;
      }
      .hero h1 {
        font-size: 2.2rem;
      }
      .hero-sub {
        margin-left: auto;
        margin-right: auto;
      }
      .hero-buttons {
        justify-content: center;
      }
    }
    /* 通用板块 */
    .section {
      padding: 80px 0;
    }
    .section-title {
      font-family: var(--font-display);
      font-size: 2.5rem;
      font-weight: 700;
      text-align: center;
      margin-bottom: 16px;
      color: var(--primary-deep);
    }
    .section-desc {
      text-align: center;
      color: var(--text-secondary);
      max-width: 680px;
      margin: 0 auto 50px;
      font-size: 1.1rem;
    }
    /* 优势卡片 */
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 24px;
    }
    .adv-card {
      background: var(--white);
      padding: 32px 24px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      text-align: center;
      transition: all var(--transition);
    }
    .adv-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-card-hover);
      border: 1px solid rgba(200,162,75,0.2);
    }
    .icon-circle {
      width: 64px;
      height: 64px;
      background: var(--accent-gold);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 20px;
      color: white;
      font-size: 1.8rem;
    }
    .adv-card h3 {
      font-size: 1.4rem;
      margin-bottom: 12px;
      font-weight: 600;
    }
    /* 功能图文 */
    .feature-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }
    .feature-row.reverse {
      flex-direction: row-reverse;
    }
    .feature-text {
      flex: 1;
    }
    .feature-text h2 {
      font-family: var(--font-display);
      font-size: 2rem;
      margin-bottom: 20px;
    }
    .feature-list {
      list-style: none;
    }
    .feature-list li {
      margin-bottom: 12px;
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 1.05rem;
    }
    .feature-list li i {
      color: var(--accent-gold);
      font-size: 1.2rem;
    }
    .feature-image {
      flex: 1;
      border-radius: 16px;
      overflow: hidden;
      box-shadow: var(--shadow-card);
    }
    /* 场景卡片 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
    }
    .scene-card {
      background: var(--white);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    .scene-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-card-hover);
    }
    .scene-img {
      height: 200px;
      background-size: cover;
      background-position: center;
    }
    .scene-content {
      padding: 22px;
    }
    .scene-content h3 {
      font-size: 1.5rem;
      margin-bottom: 10px;
    }
    .gold-link {
      color: var(--accent-gold);
      font-weight: 600;
      margin-top: 12px;
      display: inline-block;
    }
    /* 案例数据 */
    .stats-bar {
      display: flex;
      justify-content: space-around;
      background: var(--primary-deep);
      color: white;
      padding: 40px 20px;
      border-radius: 20px;
      margin-bottom: 50px;
    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--accent-gold);
    }
    .case-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
    }
    .case-card {
      background: white;
      padding: 28px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
    }
    .case-metric {
      font-size: 2rem;
      font-weight: 700;
      color: var(--accent-gold);
    }
    /* 价格卡 */
    .price-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
      align-items: start;
    }
    .price-card {
      background: white;
      padding: 36px 24px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      text-align: center;
      position: relative;
      transition: var(--transition);
    }
    .price-card.featured {
      border: 2px solid var(--accent-gold);
      transform: scale(1.03);
      background: #FFFDF5;
    }
    .badge {
      background: var(--accent-gold);
      color: white;
      padding: 4px 16px;
      border-radius: 20px;
      font-size: 0.85rem;
      position: absolute;
      top: -12px;
      left: 50%;
      transform: translateX(-50%);
    }
    .price {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--primary-deep);
      margin: 20px 0;
    }
    /* FAQ */
    .faq-item {
      background: white;
      border-radius: 10px;
      margin-bottom: 12px;
      box-shadow: 0 1px 6px rgba(0,0,0,0.04);
      border-left: 4px solid transparent;
      transition: var(--transition);
      cursor: pointer;
      padding: 20px;
    }
    .faq-item.active {
      border-left-color: var(--accent-gold);
    }
    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-secondary);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 12px;
    }
    /* 页脚CTA */
    .cta-dark {
      background: var(--primary-deep);
      color: white;
      padding: 70px 0;
    }
    .cta-form input, .cta-form textarea {
      width: 100%;
      padding: 12px;
      margin-bottom: 16px;
      border-radius: 6px;
      border: none;
      background: rgba(255,255,255,0.1);
      color: white;
    }
    .footer {
      background: #0f0f10;
      color: #aaa;
      padding: 50px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 30px;
    }
    @media (max-width: 768px) {
      .grid-4, .grid-3, .case-grid, .price-grid, .footer-grid {
        grid-template-columns: 1fr;
      }
      .feature-row {
        flex-direction: column;
      }
    }