/* roulang page: index */
:root {
      --primary-black: #1A1A1A;
      --accent-gold: #D4AF37;
      --hover-gold: #B8942E;
      --bg-warm: #FAFAFA;
      --card-bg: #FFFFFF;
      --text-dark: #1A1A1A;
      --text-mid: #4A4A4A;
      --text-light: #8A8A8A;
      --border-light: #E0E0E0;
      --faq-bg: #F5F5F5;
      --shadow-sm: 0 2px 16px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 30px rgba(0,0,0,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --transition: 0.3s ease;
      --font-sans: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
      --font-chinese: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', '苹方', '思源黑体', sans-serif;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-chinese);
      background-color: var(--bg-warm);
      color: var(--text-dark);
      line-height: 1.7;
      margin: 0;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }
    h1, h2, h3, h4, .nav-logo, .btn, .stat-number {
      font-family: var(--font-chinese);
    }
    .container {
      max-width: 1280px;
      padding-left: 24px;
      padding-right: 24px;
    }
    /* 导航 */
    .navbar {
      height: 64px;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      box-shadow: 0 2px 12px rgba(0,0,0,0.02);
      padding: 0;
      position: fixed;
      width: 100%;
      top: 0;
      z-index: 99;
    }
    .navbar .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 100%;
      max-width: 1280px;
    }
    .logo-area {
      font-size: 1.8rem;
      font-weight: 650;
      letter-spacing: 1px;
      color: var(--primary-black);
      text-decoration: none;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo-area span {
      color: var(--accent-gold);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-link {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-dark);
      text-decoration: none;
      transition: color 0.2s, border-bottom 0.2s;
      border-bottom: 2px solid transparent;
      padding-bottom: 4px;
    }
    .nav-link:hover {
      color: var(--accent-gold);
      border-bottom-color: var(--accent-gold);
    }
    .nav-cta {
      background: var(--accent-gold);
      color: var(--primary-black);
      font-weight: 600;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      text-decoration: none;
      transition: background var(--transition), transform 0.2s;
      font-size: 0.9rem;
      border: none;
      cursor: pointer;
      margin-left: 12px;
    }
    .nav-cta:hover {
      background: var(--hover-gold);
      transform: scale(1.02);
      color: var(--primary-black);
    }
    /* 移动菜单按钮 */
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.6rem;
      color: var(--primary-black);
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .menu-toggle {
        display: block;
      }
      .mobile-menu {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background: rgba(255,255,255,0.98);
        backdrop-filter: blur(20px);
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 32px;
        z-index: 100;
      }
      .mobile-menu a {
        font-size: 2rem;
        font-weight: 500;
        color: var(--primary-black);
        text-decoration: none;
      }
      .mobile-menu .nav-cta {
        font-size: 1.2rem;
        padding: 14px 36px;
      }
    }
    /* Hero 分屏 */
    .hero {
      display: flex;
      min-height: 100vh;
      align-items: center;
      margin-top: 0;
      padding-top: 64px;
    }
    .hero-left {
      flex: 0 0 50%;
      padding: 0 40px 0 20px;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }
    .hero-right {
      flex: 0 0 50%;
      height: 100vh;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      overflow: hidden;
    }
    .hero-right::after {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: linear-gradient(135deg, rgba(212,175,55,0.15) 0%, rgba(26,26,26,0.1) 100%);
    }
    .hero h1 {
      font-size: 3.4rem;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 1.2rem;
      color: var(--primary-black);
    }
    .hero .subtitle {
      font-size: 1.2rem;
      color: var(--text-mid);
      margin-bottom: 2rem;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary-gold {
      background: var(--accent-gold);
      color: var(--primary-black);
      font-weight: 600;
      padding: 14px 34px;
      border-radius: var(--radius-btn);
      border: none;
      transition: all var(--transition);
      text-decoration: none;
      display: inline-block;
    }
    .btn-primary-gold:hover {
      background: var(--hover-gold);
      transform: scale(1.02);
      color: #000;
    }
    .btn-outline-dark {
      border: 1.5px solid var(--primary-black);
      color: var(--primary-black);
      background: transparent;
      padding: 14px 34px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all var(--transition);
      text-decoration: none;
    }
    .btn-outline-dark:hover {
      background: var(--primary-black);
      color: white;
    }
    @media (max-width: 992px) {
      .hero {
        flex-direction: column;
      }
      .hero-left, .hero-right {
        flex: 0 0 100%;
        width: 100%;
      }
      .hero-right {
        height: 50vh;
      }
      .hero-left {
        padding: 60px 20px;
      }
    }
    /* 板块通用 */
    section {
      padding: 90px 0;
    }
    .section-title {
      font-size: 2.2rem;
      font-weight: 600;
      margin-bottom: 20px;
      color: var(--primary-black);
    }
    .section-sub {
      color: var(--text-mid);
      margin-bottom: 48px;
      font-size: 1.1rem;
    }
    /* 核心优势 错落栅格 */
    .advantage-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 40px;
    }
    .adv-card {
      background: var(--card-bg);
      padding: 32px 24px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: all var(--transition);
      display: flex;
      flex-direction: column;
      align-items: flex-start;
    }
    .adv-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .icon-circle {
      width: 56px;
      height: 56px;
      background: var(--accent-gold);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      color: #000;
      font-size: 1.5rem;
    }
    .adv-card h3 {
      font-size: 1.3rem;
      font-weight: 600;
      margin-bottom: 10px;
    }
    @media (max-width: 768px) {
      .advantage-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 产品分组左右交替 */
    .feature-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 60px;
    }
    .feature-img img {
      width: 100%;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
    }
    .feature-text {
      flex: 1;
    }
    .reverse {
      flex-direction: row-reverse;
    }
    @media (max-width: 768px) {
      .feature-row, .reverse {
        flex-direction: column;
      }
    }
    /* 场景卡片 */
    .scene-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }
    .scene-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: all var(--transition);
    }
    .scene-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-hover);
    }
    .scene-img {
      width: 100%;
      height: 200px;
      object-fit: cover;
    }
    .scene-body {
      padding: 24px;
    }
    @media (max-width: 768px) {
      .scene-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 案例网格 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 25px;
    }
    .case-item {
      background: var(--card-bg);
      padding: 28px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
    }
    .stat-big {
      font-size: 2.4rem;
      font-weight: 700;
      color: var(--accent-gold);
    }
    @media (max-width: 768px) {
      .case-grid {
        grid-template-columns: 1fr;
      }
    }
    /* FAQ */
    .faq-column {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .accordion-button {
      font-weight: 600;
      background: white;
      box-shadow: none;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-btn) !important;
      padding: 18px 24px;
    }
    .accordion-button:not(.collapsed) {
      background: var(--faq-bg);
      color: var(--primary-black);
      box-shadow: none;
    }
    .accordion-body {
      background: var(--faq-bg);
      border-radius: 0 0 8px 8px;
    }
    @media (max-width: 768px) {
      .faq-column {
        grid-template-columns: 1fr;
      }
    }
    /* CTA 区 */
    .cta-section {
      background: var(--primary-black);
      color: white;
      text-align: center;
      padding: 80px 20px;
    }
    .cta-section h2 {
      color: white;
    }
    /* 页脚 */
    footer {
      background: #1A1A1A;
      color: #AAAAAA;
      padding: 50px 0 20px;
    }
    footer a {
      color: #AAAAAA;
      text-decoration: none;
    }
    footer a:hover {
      color: var(--accent-gold);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }