/* roulang page: index */
:root {
      --primary: #FF6B35;
      --primary-dark: #E55A2B;
      --secondary: #1E1E2F;
      --accent: #00D68F;
      --accent-dark: #00B87A;
      --bg-light: #FAFAF8;
      --white: #FFFFFF;
      --gray-100: #F5F5F7;
      --gray-200: #E8E8EC;
      --gray-400: #8E8E9E;
      --gray-500: #4A4A5A;
      --gray-700: #2E2E3A;
      --radius-sm: 12px;
      --radius-md: 16px;
      --radius-lg: 24px;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.04), 0 1px 3px rgba(0,0,0,0.02);
      --shadow-card-hover: 0 12px 32px rgba(0,0,0,0.08);
      --shadow-nav: 0 2px 16px rgba(0,0,0,0.06);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, sans-serif;
      --font-number: "Inter", "SF Pro Text", -apple-system, sans-serif;
      --transition: 0.3s ease;
      --max-width: 1280px;
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--gray-500);
      line-height: 1.6;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

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

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航 */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      transition: background var(--transition), box-shadow var(--transition);
      background: transparent;
      padding: 16px 0;
    }

    .nav.scrolled {
      background: var(--white);
      box-shadow: var(--shadow-nav);
      padding: 12px 0;
    }

    .nav .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 20px;
      color: var(--white);
      transition: color var(--transition);
    }

    .nav.scrolled .logo {
      color: var(--secondary);
    }

    .logo-icon {
      width: 34px;
      height: 34px;
      background: var(--primary);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      color: white;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
      list-style: none;
    }

    .nav-links a {
      font-weight: 500;
      color: rgba(255,255,255,0.9);
      transition: color var(--transition);
      font-size: 15px;
      position: relative;
    }

    .nav.scrolled .nav-links a {
      color: var(--secondary);
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      z-index: 1001;
    }

    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--white);
      transition: var(--transition);
      border-radius: 2px;
    }

    .nav.scrolled .hamburger span {
      background: var(--secondary);
    }

    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: var(--secondary);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 32px;
      transform: translateX(100%);
      transition: transform 0.4s ease;
      z-index: 999;
    }

    .mobile-menu.active {
      transform: translateX(0);
    }

    .mobile-menu a {
      color: white;
      font-size: 20px;
      font-weight: 600;
    }

    .mobile-menu .close-btn {
      position: absolute;
      top: 24px;
      right: 24px;
      font-size: 28px;
      color: white;
      cursor: pointer;
    }

    /* Hero */
    .hero {
      background: linear-gradient(135deg, #2E2E3A 0%, #1E1E2F 100%);
      min-height: 90vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
      padding: 120px 0 80px;
      color: white;
    }

    .hero-bg {
      position: absolute;
      right: -10%;
      top: 50%;
      transform: translateY(-50%);
      width: 55%;
      opacity: 0.25;
      pointer-events: none;
      mask-image: linear-gradient(to left, black 30%, transparent);
      -webkit-mask-image: linear-gradient(to left, black 30%, transparent);
    }

    .hero .container {
      display: flex;
      align-items: center;
      gap: 60px;
      position: relative;
      z-index: 2;
    }

    .hero-content {
      flex: 1;
    }

    .hero h1 {
      font-size: 48px;
      font-weight: 800;
      line-height: 1.2;
      letter-spacing: -0.5px;
      margin-bottom: 20px;
      color: white;
    }

    .hero-sub {
      font-size: 18px;
      color: rgba(255,255,255,0.75);
      margin-bottom: 32px;
      max-width: 480px;
    }

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

    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      transition: background var(--transition), box-shadow var(--transition);
      display: inline-flex;
      align-items: center;
      gap: 8px;
      box-shadow: 0 8px 20px rgba(255,107,53,0.3);
    }

    .btn-primary:hover {
      background: var(--primary-dark);
      box-shadow: 0 12px 24px rgba(255,107,53,0.4);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 14px 32px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      transition: all var(--transition);
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }

    .btn-outline:hover {
      background: rgba(255,107,53,0.1);
      border-color: var(--primary-dark);
      color: var(--primary-dark);
    }

    .hero-visual {
      flex: 0.9;
    }

    .hero-visual img {
      border-radius: var(--radius-lg);
      box-shadow: 0 24px 48px rgba(0,0,0,0.3);
    }

    /* 区块通用 */
    section {
      padding: 80px 0;
    }

    .section-title {
      font-size: 36px;
      font-weight: 700;
      text-align: center;
      color: var(--secondary);
      margin-bottom: 16px;
    }

    .section-sub {
      text-align: center;
      color: var(--gray-400);
      max-width: 600px;
      margin: 0 auto 48px;
    }

    /* 核心优势 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .feature-card {
      background: var(--white);
      padding: 32px 24px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-card);
      transition: all var(--transition);
      text-align: center;
    }

    .feature-card:hover {
      box-shadow: var(--shadow-card-hover);
      transform: translateY(-4px);
    }

    .feature-icon {
      width: 52px;
      height: 52px;
      background: rgba(255,107,53,0.1);
      border-radius: 14px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 20px;
      color: var(--primary);
      font-size: 24px;
    }

    .feature-card h3 {
      font-size: 20px;
      font-weight: 600;
      color: var(--secondary);
      margin-bottom: 12px;
    }

    /* 游戏滚动区 */
    .games-track {
      display: flex;
      gap: 20px;
      overflow-x: auto;
      padding-bottom: 16px;
      scroll-snap-type: x mandatory;
      -webkit-overflow-scrolling: touch;
    }

    .games-track::-webkit-scrollbar {
      display: none;
    }

    .game-card {
      min-width: 220px;
      background: var(--white);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-card);
      overflow: hidden;
      transition: all var(--transition);
      scroll-snap-align: start;
    }

    .game-card:hover {
      box-shadow: var(--shadow-card-hover);
      transform: translateY(-4px);
    }

    .game-cover {
      height: 140px;
      background: #e0e0e0;
      object-fit: cover;
    }

    .game-info {
      padding: 16px;
    }

    .game-info h4 {
      font-weight: 600;
      color: var(--secondary);
      margin-bottom: 6px;
    }

    .game-meta {
      font-size: 13px;
      color: var(--gray-400);
      display: flex;
      justify-content: space-between;
      margin-bottom: 12px;
    }

    .btn-download-sm {
      background: var(--accent);
      color: var(--secondary);
      padding: 8px 16px;
      border-radius: 8px;
      font-weight: 600;
      font-size: 14px;
      width: 100%;
      transition: background var(--transition);
    }

    .btn-download-sm:hover {
      background: var(--accent-dark);
    }

    /* 场景交替 */
    .scenario-row {
      display: flex;
      align-items: center;
      gap: 48px;
      margin-bottom: 64px;
    }

    .scenario-row.reverse {
      flex-direction: row-reverse;
    }

    .scenario-img {
      flex: 1;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-card);
    }

    .scenario-text {
      flex: 1;
    }

    .scenario-text h3 {
      font-size: 24px;
      font-weight: 700;
      color: var(--secondary);
      margin-bottom: 12px;
    }

    /* 数据统计 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }

    .stat-number {
      font-family: var(--font-number);
      font-size: 48px;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.1;
    }

    .stat-label {
      color: var(--gray-400);
      margin-top: 8px;
    }

    /* FAQ */
    .faq-list {
      max-width: 720px;
      margin: 0 auto;
      background: var(--white);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-card);
      overflow: hidden;
    }

    details {
      border-bottom: 1px solid var(--gray-200);
    }

    details:last-child {
      border-bottom: none;
    }

    summary {
      padding: 20px 24px;
      font-weight: 600;
      color: var(--secondary);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      transition: background var(--transition);
    }

    summary:hover {
      background: var(--gray-100);
    }

    .faq-answer {
      padding: 0 24px 20px;
      color: var(--gray-500);
    }

    /* CTA */
    .cta-section {
      background: var(--secondary);
      color: white;
      text-align: center;
      padding: 80px 0;
    }

    .cta-section h2 {
      color: white;
    }

    .btn-cta-large {
      background: var(--primary);
      color: white;
      padding: 18px 48px;
      border-radius: var(--radius-md);
      font-weight: 700;
      font-size: 18px;
      display: inline-flex;
      align-items: center;
      gap: 10px;
      margin-top: 24px;
    }

    /* 页脚 */
    .footer {
      background: var(--secondary);
      color: #B0B0C0;
      padding: 60px 0 24px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
      margin-bottom: 40px;
    }

    .footer h4 {
      color: white;
      margin-bottom: 16px;
      font-weight: 600;
    }

    .footer a {
      color: #B0B0C0;
      display: block;
      margin-bottom: 8px;
    }

    .footer a:hover {
      color: var(--primary);
    }

    .copyright {
      border-top: 1px solid rgba(255,255,255,0.1);
      padding-top: 20px;
      text-align: center;
      font-size: 14px;
    }

    /* 响应式 */
    @media (max-width: 1024px) {
      .features-grid { grid-template-columns: repeat(2, 1fr); }
      .stats-grid { grid-template-columns: repeat(2, 1fr); }
      .hero .container { flex-direction: column; }
      .hero-visual { order: -1; }
      .hero h1 { font-size: 40px; }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .features-grid { grid-template-columns: 1fr; }
      .scenario-row, .scenario-row.reverse { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      section { padding: 48px 0; }
      .section-title { font-size: 28px; }
      .hero h1 { font-size: 32px; }
    }

    @media (max-width: 480px) {
      .container { padding: 0 16px; }
      .hero { padding: 100px 0 48px; }
      .hero-actions { flex-direction: column; }
      .btn-primary, .btn-outline { justify-content: center; }
      .stats-grid { grid-template-columns: 1fr 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .game-card { min-width: 160px; }
    }