/* roulang page: index */
/* ===== CSS 变量与设计系统 ===== */
    :root {
      --primary-deep: #0B1A2F;
      --primary-hover: #132B45;
      --accent-cyan: #00E5FF;
      --accent-gold: #FFB347;
      --bg-light: #F5F7FA;
      --bg-dark: #060E18;
      --card-bg: #FFFFFF;
      --text-primary: #1A2634;
      --text-secondary: #5A6A7A;
      --text-on-dark: #E0E8F0;
      --border-light: rgba(0,0,0,0.04);
      --shadow-card: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 28px rgba(0,0,0,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --font-body: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-data: 'Inter', 'Roboto', sans-serif;
      --max-width: 1280px;
      --nav-height: 72px;
    }

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

    body {
      font-family: var(--font-body);
      background-color: var(--bg-light);
      color: var(--text-primary);
      line-height: 1.7;
      font-weight: 400;
      font-size: 1rem;
      -webkit-font-smoothing: antialiased;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }

    button, .btn {
      cursor: pointer;
      font-family: var(--font-body);
      border: none;
      background: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      transition: all 0.25s ease;
      font-weight: 500;
    }

    /* 自定义容器 */
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }

    /* 全局标题层级 */
    h2 {
      font-size: 2.25rem;
      font-weight: 700;
      line-height: 1.3;
      letter-spacing: -0.3px;
    }
    h3 {
      font-size: 1.35rem;
      font-weight: 700;
      line-height: 1.4;
    }

    /* ===== 导航 Modern Mega Menu ===== */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background: rgba(11, 26, 47, 0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      z-index: 1000;
      border-bottom: 1px solid rgba(255,255,255,0.05);
      display: flex;
      align-items: center;
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 1.7rem;
      font-weight: 700;
      color: white;
      letter-spacing: 1px;
    }
    .logo i {
      color: var(--accent-cyan);
      font-size: 1.9rem;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      color: #ccd6e0;
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
      padding: 8px 0;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: white;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-cyan);
      transition: width 0.25s ease;
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }

    /* Mega 菜单触发器 */
    .mega-trigger {
      position: relative;
      color: white;
      background: rgba(255,255,255,0.08);
      padding: 8px 18px;
      border-radius: 30px;
      font-weight: 500;
      font-size: 0.9rem;
      border: 1px solid rgba(255,255,255,0.15);
      cursor: pointer;
    }
    .mega-panel {
      position: absolute;
      top: 60px;
      right: 0;
      width: 640px;
      background: white;
      border-radius: 16px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.15);
      padding: 24px;
      display: none;
      grid-template-columns: 1fr 1fr 1fr;
      gap: 24px;
      z-index: 100;
      color: var(--text-primary);
      border: 1px solid rgba(0,0,0,0.06);
    }
    .mega-trigger:hover .mega-panel,
    .mega-trigger:focus-within .mega-panel {
      display: grid;
    }
    .mega-col h4 {
      font-size: 0.9rem;
      text-transform: uppercase;
      letter-spacing: 0.5px;
      color: var(--text-secondary);
      margin-bottom: 16px;
    }
    .mega-item {
      display: flex;
      align-items: center;
      gap: 12px;
      padding: 8px;
      border-radius: 8px;
      margin-bottom: 6px;
      transition: background 0.2s;
    }
    .mega-item:hover {
      background: #f0f4fa;
      color: var(--accent-cyan);
    }
    .mega-item i {
      color: var(--accent-cyan);
      width: 20px;
    }

    /* 移动端汉堡菜单 */
    .mobile-toggle {
      display: none;
      background: none;
      color: white;
      font-size: 1.8rem;
    }
    @media (max-width: 1024px) {
      .nav-links { display: none; }
      .mobile-toggle { display: block; }
      .mega-trigger { display: none; }
      .mobile-menu {
        display: none;
        position: absolute;
        top: var(--nav-height);
        left: 0;
        width: 100%;
        background: rgba(11,26,47,0.98);
        backdrop-filter: blur(12px);
        flex-direction: column;
        padding: 24px;
        gap: 20px;
      }
      .mobile-menu.active { display: flex; }
      .mobile-menu a { color: white; font-size: 1.1rem; }
    }

    /* ===== 首屏 Hero ===== */
    .hero {
      background: linear-gradient(135deg, var(--primary-deep) 0%, #030B14 100%);
      padding: calc(var(--nav-height) + 60px) 0 80px;
      display: flex;
      align-items: center;
      min-height: 90vh;
      color: white;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
    }
    .hero-left {
      flex: 1 1 50%;
    }
    .hero-right {
      flex: 1 1 50%;
      position: relative;
      border-radius: 24px;
      overflow: hidden;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 420px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.4);
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .hero-right::after {
      content: '';
      position: absolute;
      inset: 0;
      background: rgba(11,26,47,0.3);
    }
    .hero-right img {
      position: relative;
      z-index: 2;
      width: 70%;
      filter: drop-shadow(0 0 20px rgba(0,229,255,0.3));
    }
    .hero h1 {
      font-size: 3.2rem;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 20px;
    }
    .hero .subtitle {
      font-size: 1.2rem;
      color: #b0c7da;
      margin-bottom: 36px;
    }
    .btn-group {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary-deep);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      background: #0B1A2F;
      border: 1px solid rgba(255,255,255,0.1);
    }
    .btn-primary:hover {
      background: #132B45;
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--accent-cyan);
      color: var(--accent-cyan);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
    }
    .btn-outline:hover {
      background: rgba(0,229,255,0.06);
    }

    @media (max-width: 768px) {
      .hero-grid {
        flex-direction: column;
      }
      .hero h1 {
        font-size: 2.4rem;
      }
    }

    /* ===== 通用区块 ===== */
    section {
      padding: 80px 0;
    }
    .section-label {
      font-size: 0.9rem;
      text-transform: uppercase;
      letter-spacing: 1px;
      color: var(--accent-cyan);
      margin-bottom: 12px;
      font-weight: 600;
    }

    /* 亮点网格 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .advantage-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 28px 24px;
      box-shadow: var(--shadow-card);
      border: 1px solid var(--border-light);
      transition: all 0.3s ease;
    }
    .advantage-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .advantage-card i {
      font-size: 2rem;
      color: var(--accent-cyan);
      margin-bottom: 18px;
      transition: color 0.2s;
    }
    .advantage-card:hover i {
      color: var(--accent-gold);
    }
    @media (max-width: 768px) {
      .grid-3 { grid-template-columns: 1fr; }
    }

    /* 瀑布流赛事 */
    .waterfall {
      columns: 3;
      column-gap: 24px;
    }
    .match-card {
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      margin-bottom: 24px;
      break-inside: avoid;
      border-left: 3px solid var(--accent-cyan);
      box-shadow: var(--shadow-card);
    }
    .match-card img {
      width: 100%;
      height: auto;
      object-fit: cover;
    }
    .match-info {
      padding: 20px;
    }
    @media (max-width: 1024px) {
      .waterfall { columns: 2; }
    }
    @media (max-width: 520px) {
      .waterfall { columns: 1; }
    }

    /* 对比表 */
    .compare-table {
      display: grid;
      grid-template-columns: 1fr 1fr;
      border-radius: 16px;
      overflow: hidden;
      box-shadow: var(--shadow-card);
    }
    .compare-col {
      background: white;
      padding: 32px;
    }
    .compare-col.highlight {
      background: #f0f9ff;
    }
    .compare-header {
      background: var(--primary-deep);
      color: white;
      padding: 20px;
      font-weight: 700;
      font-size: 1.2rem;
    }
    @media (max-width: 768px) {
      .compare-table { grid-template-columns: 1fr; }
    }

    /* FAQ */
    details {
      background: white;
      border-radius: 12px;
      padding: 18px 24px;
      margin-bottom: 12px;
      border-left: 4px solid transparent;
      transition: 0.2s;
    }
    details[open] {
      border-left: 4px solid var(--accent-gold);
    }
    summary {
      font-weight: 700;
      font-size: 1.1rem;
      cursor: pointer;
    }

    /* CTA 横幅 */
    .cta-banner {
      background: #060E18;
      text-align: center;
      padding: 80px 24px;
      color: white;
      background-image: radial-gradient(circle at 50% 50%, rgba(0,229,255,0.1) 0%, transparent 60%);
    }
    .btn-cyan {
      background: var(--accent-cyan);
      color: #060E18;
      font-weight: 700;
      padding: 16px 40px;
      border-radius: 40px;
    }

    /* 页脚 */
    .footer {
      background: #060E18;
      color: #b0c7da;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    @media (max-width: 768px) {
      .footer-grid { grid-template-columns: 1fr; }
    }