/* roulang page: index */
:root {
      --primary-red: #E13B3B;
      --primary-red-hover: #C62E2E;
      --deep-charcoal: #1A1D23;
      --data-blue: #2D7FF9;
      --gold: #F5A623;
      --bg-light: #F7F8FA;
      --card-bg: #FFFFFF;
      --text-main: #1A1D23;
      --text-body: #3A3F4B;
      --text-muted: #6B7280;
      --text-light: #F0F1F3;
      --border-light: #E5E7EB;
      --shadow-sm: 0 2px 8px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.10);
      --shadow-nav: 0 4px 20px rgba(0,0,0,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --radius-nav: 40px;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      background-color: var(--bg-light);
      color: var(--text-body);
      line-height: 1.75;
      margin: 0;
      padding: 0;
      scroll-behavior: smooth;
    }
    .container-custom {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }
    /* 导航胶囊 */
    .nav-capsule {
      background: rgba(26, 29, 35, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-radius: var(--radius-nav);
      max-width: 1100px;
      margin: 16px auto 0;
      padding: 8px 28px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      transition: background 0.3s ease;
      box-shadow: var(--shadow-nav);
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      z-index: 50;
    }
    .nav-scrolled {
      background: rgba(26, 29, 35, 0.95);
    }
    .nav-link {
      color: #E5E7EB;
      font-weight: 500;
      font-size: 0.95rem;
      padding: 8px 14px;
      border-radius: 20px;
      transition: all 0.2s ease;
    }
    .nav-link:hover {
      background: rgba(225,59,59,0.2);
      color: white;
    }
    .mobile-menu {
      display: none;
      flex-direction: column;
      gap: 8px;
      background: rgba(26,29,35,0.98);
      backdrop-filter: blur(16px);
      border-radius: 24px;
      padding: 24px;
      margin-top: 12px;
    }
    /* 按钮 */
    .btn-primary {
      background-color: var(--primary-red);
      color: white;
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: all 0.2s ease;
      box-shadow: 0 4px 12px rgba(225,59,59,0.3);
    }
    .btn-primary:hover {
      background-color: var(--primary-red-hover);
      transform: scale(1.03);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary-red);
      color: var(--primary-red);
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: all 0.2s ease;
    }
    .btn-outline:hover {
      background-color: #FDE8E8;
      border-color: #C62E2E;
      color: #C62E2E;
    }
    .text-link-blue {
      color: var(--data-blue);
      font-weight: 500;
      transition: color 0.2s;
      text-underline-offset: 4px;
      text-decoration: underline;
      text-decoration-color: transparent;
    }
    .text-link-blue:hover {
      text-decoration-color: var(--data-blue);
    }
    /* 卡片 */
    .card-hover {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 28px 24px;
      transition: all 0.25s ease;
      box-shadow: var(--shadow-sm);
      border: 1px solid transparent;
    }
    .card-hover:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
      border-color: rgba(225,59,59,0.15);
    }
    .deep-card {
      background: rgba(255,255,255,0.05);
      border: 1px solid rgba(255,255,255,0.1);
      border-radius: var(--radius-card);
      padding: 24px;
      backdrop-filter: blur(4px);
    }
    /* 动画 */
    .fade-up {
      opacity: 0;
      transform: translateY(24px);
      transition: opacity 0.6s ease, transform 0.6s ease;
    }
    .fade-up.visible {
      opacity: 1;
      transform: translateY(0);
    }
    .count-up {
      font-weight: 800;
      color: var(--gold);
      font-size: 2.25rem;
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }
    .faq-question {
      background: white;
      padding: 20px 16px;
      font-weight: 600;
      font-size: 1.1rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      transition: background 0.2s;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.2s;
      background: #F9FAFB;
      padding: 0 16px;
      color: var(--text-body);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 16px;
    }
    .faq-icon {
      color: var(--primary-red);
      font-size: 1.5rem;
      font-weight: 400;
      transition: transform 0.2s;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    /* 响应式 */
    @media (max-width: 1024px) {
      .nav-capsule {
        padding: 8px 20px;
      }
    }
    @media (max-width: 768px) {
      .nav-capsule {
        border-radius: 30px;
        max-width: 95%;
        margin-top: 8px;
      }
      .desktop-nav-links {
        display: none;
      }
      .mobile-hamburger {
        display: block;
      }
      .mobile-menu.active {
        display: flex;
      }
      .hero-title {
        font-size: 2rem;
      }
      .grid-4, .grid-3 {
        grid-template-columns: 1fr;
      }
    }
    @media (min-width: 769px) {
      .mobile-hamburger {
        display: none;
      }
      .mobile-menu {
        display: none;
      }
      .desktop-nav-links {
        display: flex;
        gap: 8px;
      }
    }
    .hero-bg {
      background: linear-gradient(135deg, #1A1D23 0%, #0F1117 100%);
      background-image: radial-gradient(rgba(225,59,59,0.15) 1px, transparent 1px);
      background-size: 40px 40px;
    }
    .decor-line {
      width: 4px;
      background: var(--primary-red);
      border-radius: 4px;
      transition: width 0.2s;
    }
    .card-hover:hover .decor-line {
      width: 8px;
    }

@keyframes float { 0% { transform: translateY(0); } 50% { transform: translateY(-8px); } 100% { transform: translateY(0); } }