/* roulang page: index */
:root {
      --primary-orange: #E8453C;
      --primary-orange-hover: #C0392B;
      --dark-arena: #1A1D26;
      --cyan-glow: #00E5FF;
      --bg-light: #F8F9FC;
      --bg-subtle: #EEF1F6;
      --white: #FFFFFF;
      --text-body: #3A3D44;
      --text-muted: #6B6F78;
      --border-light: #E2E6ED;
      --shadow-sm: 0 4px 20px rgba(26,29,38,0.06);
      --shadow-hover: 0 8px 30px rgba(26,29,38,0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --font-sans: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --transition: 0.25s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-body);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    h1, h2, h3, h4 {
      font-weight: 700;
      color: var(--dark-arena);
    }
    h1 {
      font-size: clamp(2.5rem, 6vw, 3.25rem);
      line-height: 1.2;
      font-weight: 800;
    }
    h2 {
      font-size: clamp(1.8rem, 4vw, 2.25rem);
      margin-bottom: 1rem;
    }
    h3 {
      font-size: 1.25rem;
      font-weight: 700;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      font-weight: 600;
      transition: var(--transition);
      border: none;
      outline: none;
    }
    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.96);
      backdrop-filter: blur(10px);
      box-shadow: 0 4px 12px rgba(0,0,0,0.02);
      z-index: 1000;
      height: 64px;
      display: flex;
      align-items: center;
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 800;
      font-size: 1.4rem;
      color: var(--dark-arena);
    }
    .logo-icon {
      color: var(--primary-orange);
      font-size: 1.8rem;
      transform: rotate(-15deg);
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-link {
      font-weight: 500;
      color: var(--text-body);
      transition: color 0.2s;
      font-size: 0.95rem;
    }
    .nav-link:hover {
      color: var(--primary-orange);
    }
    .btn-primary {
      background: var(--primary-orange);
      color: var(--white);
      padding: 12px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 10px rgba(232,69,60,0.2);
    }
    .btn-primary:hover {
      background: var(--primary-orange-hover);
      box-shadow: 0 6px 18px rgba(232,69,60,0.35);
      transform: translateY(-1px);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary-orange);
      color: var(--primary-orange);
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
    }
    .btn-outline:hover {
      background: var(--primary-orange);
      color: white;
    }
    .hamburger {
      display: none;
      font-size: 1.8rem;
      background: none;
      border: none;
      color: var(--dark-arena);
    }
    /* 移动端导航抽屉 */
    .mobile-drawer {
      position: fixed;
      top: 0;
      right: -100%;
      width: 280px;
      height: 100vh;
      background: var(--dark-arena);
      padding: 24px;
      display: flex;
      flex-direction: column;
      gap: 24px;
      transition: right 0.3s ease;
      z-index: 2000;
    }
    .mobile-drawer.active {
      right: 0;
    }
    .drawer-link {
      color: white;
      font-size: 1.2rem;
      font-weight: 500;
    }
    .drawer-close {
      align-self: flex-end;
      background: none;
      border: none;
      color: white;
      font-size: 2rem;
    }
    /* Hero */
    .hero {
      padding: 120px 0 80px;
      background: linear-gradient(135deg, #F8F9FC 0%, #EEF1F6 100%);
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 48px;
    }
    .hero-text {
      flex: 1;
    }
    .hero-text h1 {
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 1.1rem;
      color: var(--text-muted);
      margin-bottom: 32px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-image {
      flex: 1;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 360px;
      border-radius: 24px;
      box-shadow: var(--shadow-hover);
    }
    /* 通用板块 */
    .section {
      padding: 90px 0;
    }
    .section-header {
      text-align: center;
      margin-bottom: 56px;
    }
    .grid-3, .grid-4 {
      display: grid;
      gap: 28px;
    }
    .grid-3 { grid-template-columns: repeat(3,1fr); }
    .grid-4 { grid-template-columns: repeat(4,1fr); }
    .card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 32px 28px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      border: 1px solid transparent;
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: var(--cyan-glow);
    }
    .icon-box {
      font-size: 2.2rem;
      color: var(--primary-orange);
      margin-bottom: 20px;
    }
    .feature-group {
      display: flex;
      align-items: center;
      gap: 48px;
      margin-bottom: 80px;
    }
    .feature-group.reverse {
      flex-direction: row-reverse;
    }
    .feature-img {
      flex: 1;
      border-radius: 16px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .feature-content {
      flex: 1;
    }
    .stat-number {
      font-size: 2.4rem;
      font-weight: 700;
      color: var(--cyan-glow);
    }
    /* FAQ */
    .faq-item {
      background: white;
      border-radius: 12px;
      margin-bottom: 16px;
      box-shadow: 0 2px 12px rgba(0,0,0,0.02);
      overflow: hidden;
    }
    .faq-question {
      padding: 20px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      border-left: 4px solid var(--primary-orange);
      transition: 0.2s;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      padding: 0 24px;
      color: var(--text-muted);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 0 24px 20px;
    }
    .faq-item.active .faq-question {
      border-left-color: var(--cyan-glow);
    }
    .cta-banner {
      background: var(--dark-arena);
      color: white;
      text-align: center;
      padding: 80px 24px;
      border-radius: 24px;
      margin: 60px 0;
    }
    .footer {
      background: var(--dark-arena);
      color: #B0B5BE;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }
    @media (max-width: 1024px) {
      .grid-4 { grid-template-columns: repeat(2,1fr); }
      .grid-3 { grid-template-columns: 1fr; }
      .feature-group { flex-direction: column; }
      .feature-group.reverse { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      .nav-menu { display: none; }
      .hamburger { display: block; }
      .hero-grid { flex-direction: column; }
      .hero-image { min-height: 280px; width: 100%; }
      .grid-4, .footer-grid { grid-template-columns: 1fr; }
    }