/* roulang page: index */
/* ----- 设计变量与基础重置 ----- */
    :root {
      --primary: #d42e2e;
      --primary-dark: #a51f1f;
      --primary-soft: #fce9e9;
      --accent: #f5b042;
      --accent-glow: #ffd966;
      --bg-dark: #0b0c10;
      --bg-card: #1a1c23;
      --bg-section: #f8f9fc;
      --text-main: #1e1e2f;
      --text-soft: #5f6b7a;
      --text-inverse: #ffffff;
      --border-light: #e9ecf0;
      --border-card: rgba(255,255,255,0.08);
      --shadow-sm: 0 8px 20px rgba(0,0,0,0.04);
      --shadow-lg: 0 25px 50px -12px rgba(0,0,0,0.25);
      --radius-sm: 12px;
      --radius-md: 20px;
      --radius-xl: 32px;
      --font-sans: 'Inter', 'Helvetica Neue', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
      --transition: all 0.25s ease;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: #ffffff;
      color: var(--text-main);
      line-height: 1.5;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
    }

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

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

    button, .button {
      cursor: pointer;
      font-family: inherit;
      transition: var(--transition);
    }

    /* 容器自定义 */
    .custom-container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* ----- 导航：居中Logo + 两侧锚点 ----- */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 40;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid var(--border-light);
      box-shadow: 0 4px 12px rgba(0,0,0,0.02);
    }

    .nav-grid {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 16px 0;
    }

    .nav-left, .nav-right {
      display: flex;
      align-items: center;
      gap: 28px;
    }

    .logo-center {
      font-weight: 700;
      font-size: 1.8rem;
      letter-spacing: -0.5px;
      color: var(--primary);
      background: linear-gradient(135deg, #d42e2e 0%, #b31212 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      white-space: nowrap;
    }

    .nav-link {
      font-weight: 550;
      font-size: 0.95rem;
      color: var(--text-main);
      position: relative;
      padding: 6px 0;
    }

    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--primary);
      transition: width 0.2s ease;
    }

    .nav-link:hover {
      color: var(--primary);
    }
    .nav-link:hover::after {
      width: 100%;
    }

    .nav-cta {
      background: var(--primary);
      color: white;
      border-radius: 40px;
      padding: 10px 24px;
      font-weight: 600;
      font-size: 0.9rem;
      box-shadow: 0 6px 14px rgba(212,46,46,0.3);
      border: none;
    }
    .nav-cta:hover {
      background: var(--primary-dark);
      color: white;
      transform: translateY(-1px);
    }

    /* 移动端菜单隐藏（Foundation trigger 控制） */
    .mobile-menu-icon {
      display: none;
      font-size: 1.8rem;
      color: var(--text-main);
    }

    /* ----- Hero 盛典感 ----- */
    .hero-section {
      background: linear-gradient(135deg, #0b0c10 0%, #1e1e2f 100%);
      position: relative;
      overflow: hidden;
      padding: 90px 0 100px;
      color: white;
      text-align: center;
    }

    .hero-bg-img {
      position: absolute;
      inset: 0;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center 30%;
      opacity: 0.35;
      mix-blend-mode: overlay;
    }

    .hero-content {
      position: relative;
      z-index: 2;
    }

    .hero-badge {
      display: inline-block;
      background: rgba(255,255,255,0.1);
      backdrop-filter: blur(8px);
      border: 1px solid rgba(255,255,255,0.2);
      color: var(--accent);
      padding: 6px 20px;
      border-radius: 30px;
      font-weight: 600;
      font-size: 0.9rem;
      letter-spacing: 1px;
      margin-bottom: 24px;
    }

    .hero-title {
      font-size: 3.8rem;
      font-weight: 800;
      line-height: 1.2;
      margin-bottom: 24px;
      background: linear-gradient(to right, #ffffff, #ffd9a3);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-desc {
      font-size: 1.25rem;
      max-width: 700px;
      margin: 0 auto 36px;
      color: rgba(255,255,255,0.75);
    }

    .hero-actions {
      display: flex;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
    }

    .btn-primary-large {
      background: var(--primary);
      border: none;
      color: white;
      font-weight: 700;
      padding: 16px 38px;
      border-radius: 50px;
      font-size: 1.1rem;
      box-shadow: 0 15px 30px rgba(212,46,46,0.4);
    }
    .btn-primary-large:hover {
      background: #c02525;
      transform: translateY(-2px);
    }
    .btn-outline-light {
      background: transparent;
      border: 1.5px solid rgba(255,255,255,0.5);
      color: white;
      padding: 16px 38px;
      border-radius: 50px;
      font-weight: 600;
    }
    .btn-outline-light:hover {
      background: rgba(255,255,255,0.1);
    }

    /* 核心功能卡片 */
    .features-section {
      padding: 90px 0;
      background: #ffffff;
    }
    .section-title {
      font-weight: 700;
      font-size: 2.2rem;
      margin-bottom: 16px;
      text-align: center;
    }
    .feature-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 28px;
      margin-top: 48px;
    }
    .feature-card {
      background: white;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 32px 20px;
      text-align: center;
      transition: all 0.2s;
      box-shadow: var(--shadow-sm);
    }
    .feature-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--shadow-lg);
      border-color: #ffe0e0;
    }
    .feature-icon {
      font-size: 2.5rem;
      color: var(--primary);
      margin-bottom: 20px;
    }

    /* 场景图文交错 */
    .scenario-section {
      background: var(--bg-section);
      padding: 80px 0;
    }
    .scenario-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 70px;
    }
    .scenario-img {
      flex: 1;
      border-radius: var(--radius-xl);
      overflow: hidden;
      box-shadow: var(--shadow-lg);
    }
    .scenario-text {
      flex: 1;
    }

    /* 成功案例数据卡 */
    .stats-section {
      background: var(--bg-dark);
      color: white;
      padding: 80px 0;
      text-align: center;
    }
    .stats-grid {
      display: flex;
      justify-content: center;
      gap: 60px;
      flex-wrap: wrap;
    }
    .stat-number {
      font-size: 3rem;
      font-weight: 800;
      color: var(--accent);
    }

    /* FAQ 手风琴定制 */
    .faq-section {
      padding: 80px 0;
    }
    .accordion-title {
      font-weight: 600;
      border-bottom: 1px solid var(--border-light);
      padding: 18px 0;
    }

    /* CTA */
    .cta-section {
      background: linear-gradient(135deg, #d42e2e, #991c1c);
      color: white;
      padding: 80px 0;
      text-align: center;
    }

    /* 页脚 */
    .footer {
      background: #0b0c10;
      color: #aaa;
      padding: 40px 0;
      text-align: center;
    }

    /* 响应式断点 */
    @media (max-width: 1024px) {
      .feature-grid { grid-template-columns: repeat(2,1fr); }
      .hero-title { font-size: 2.8rem; }
    }

    @media (max-width: 768px) {
      .nav-left, .nav-right { display: none; }
      .mobile-menu-icon { display: block; }
      .nav-grid { justify-content: space-between; }
      .logo-center { margin: 0; }
      .scenario-row { flex-direction: column; }
      .feature-grid { grid-template-columns: 1fr; }
    }