/* roulang page: index */
* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    :root {
      --primary-red: #E31837;
      --deep-bg: #0A0E17;
      --card-bg: #1A1F2B;
      --accent-cyan: #00F0FF;
      --text-main: #F0F2F5;
      --text-muted: #8890A0;
      --glass-bg: rgba(26, 31, 43, 0.7);
      --glass-border: rgba(255, 255, 255, 0.06);
      --radius-card: 16px;
      --radius-btn: 50px;
      --radius-input: 12px;
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --glow-cyan: 0 0 20px rgba(0, 240, 255, 0.5);
      --font-numbers: 'Inter', 'Roboto', sans-serif;
      --font-chinese: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
    }
    body {
      font-family: var(--font-chinese);
      background: linear-gradient(135deg, #0A0E17 0%, #141B26 100%);
      color: var(--text-main);
      line-height: 1.7;
      font-size: 16px;
      min-height: 100vh;
      -webkit-font-smoothing: antialiased;
      background-attachment: fixed;
      position: relative;
    }
    body::before {
      content: "";
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: radial-gradient(circle at 20% 20%, rgba(227, 24, 55, 0.08) 0%, transparent 45%),
                        radial-gradient(circle at 80% 70%, rgba(0, 240, 255, 0.04) 0%, transparent 45%);
      pointer-events: none;
      z-index: 0;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
      position: relative;
      z-index: 2;
    }
    a {
      color: inherit;
      text-decoration: none;
    }
    img {
      max-width: 100%;
      display: block;
    }
    button, .btn {
      cursor: pointer;
      font-family: var(--font-numbers);
      font-weight: 600;
      border: none;
      background: none;
      transition: all 0.3s ease;
    }
    /* 导航 PC */
    .desktop-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 999;
      background: rgba(10, 14, 23, 0.8);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(255,255,255,0.05);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 24px;
      font-weight: 700;
      letter-spacing: 1px;
      color: white;
    }
    .logo .slash {
      display: inline-block;
      width: 4px;
      height: 28px;
      background: var(--primary-red);
      margin-right: 8px;
      transform: skewX(-15deg);
    }
    .nav-links {
      display: flex;
      gap: 28px;
      align-items: center;
    }
    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: #B0B8C1;
      position: relative;
      padding: 6px 0;
      transition: 0.2s;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: white;
    }
    .nav-links a::after {
      content: "";
      position: absolute;
      bottom: -4px;
      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%;
    }
    /* 移动端底部导航 */
    .mobile-bottom-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background: rgba(10, 14, 23, 0.9);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-top: 1px solid rgba(255,255,255,0.06);
      z-index: 1000;
      padding: 8px 16px;
      justify-content: space-around;
      align-items: center;
    }
    .mobile-nav-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      color: #8890A0;
      font-size: 12px;
      gap: 4px;
      transition: 0.2s;
      padding: 4px 12px;
      border-radius: 30px;
    }
    .mobile-nav-item i {
      font-size: 20px;
    }
    .mobile-nav-item.active {
      background: var(--primary-red);
      color: white;
      font-weight: 600;
    }

    section {
      padding: 80px 0;
      position: relative;
    }
    h1 {
      font-size: 48px;
      font-weight: 700;
      letter-spacing: -0.5px;
      line-height: 1.2;
    }
    h2 {
      font-size: 32px;
      font-weight: 700;
      margin-bottom: 16px;
    }
    h3 {
      font-size: 20px;
      font-weight: 600;
    }
    .text-muted {
      color: var(--text-muted);
      font-size: 14px;
    }
    .btn-primary {
      background: var(--primary-red);
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      box-shadow: 0 4px 14px rgba(227,24,55,0.4);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      font-weight: 700;
    }
    .btn-outline {
      border: 1.5px solid var(--accent-cyan);
      color: var(--accent-cyan);
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      background: transparent;
      font-weight: 700;
    }
    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 0 25px rgba(227,24,55,0.7);
    }
    .btn-outline:hover {
      background: rgba(0,240,255,0.08);
      transform: translateY(-2px);
      box-shadow: 0 0 20px rgba(0,240,255,0.4);
    }
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
    }

    /* Hero */
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
      min-height: 90vh;
      padding-top: 80px;
    }
    .hero-left {
      flex: 1;
    }
    .hero-right {
      flex: 0.9;
      position: relative;
    }
    .hero-badge {
      display: inline-block;
      background: rgba(0,240,255,0.1);
      color: var(--accent-cyan);
      padding: 6px 16px;
      border-radius: 30px;
      font-size: 14px;
      margin-bottom: 20px;
    }
    .hero-cta {
      display: flex;
      gap: 16px;
      margin-top: 32px;
      flex-wrap: wrap;
    }
    .floating-cards {
      position: relative;
      height: 320px;
      width: 100%;
    }
    .float-card {
      position: absolute;
      background: rgba(20, 27, 38, 0.8);
      backdrop-filter: blur(12px);
      border-radius: 20px;
      padding: 16px 20px;
      border: 1px solid rgba(255,255,255,0.1);
      color: white;
    }
    .float-card-1 { top: 10px; right: 20px; width: 180px; }
    .float-card-2 { bottom: 30px; left: 0; width: 200px; }
    .odds {
      font-family: var(--font-numbers);
      font-size: 28px;
      color: var(--accent-cyan);
    }

    /* highlights */
    .highlights-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 24px;
      margin-top: 32px;
    }
    .stat-card {
      text-align: center;
      padding: 28px 16px;
    }
    .stat-number {
      font-family: var(--font-numbers);
      font-size: 36px;
      font-weight: 700;
      color: var(--accent-cyan);
    }

    /* arena */
    .arena-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
      margin-top: 32px;
    }
    .match-card {
      position: relative;
      overflow: hidden;
      border-radius: var(--radius-card);
      background: #1A1F2B;
      transition: transform 0.25s ease, box-shadow 0.3s;
    }
    .match-card:hover {
      transform: translateY(-6px);
      box-shadow: 0 16px 40px rgba(0,0,0,0.6);
    }
    .match-img {
      height: 180px;
      background-size: cover;
      background-position: center;
      position: relative;
    }
    .match-overlay {
      position: absolute;
      bottom: 0;
      width: 100%;
      padding: 12px;
      background: linear-gradient(transparent, rgba(0,0,0,0.8));
      display: flex;
      justify-content: space-between;
    }
    .odds-tag {
      background: var(--primary-red);
      color: white;
      padding: 4px 12px;
      border-radius: 20px;
      font-weight: 700;
    }

    /* compare */
    .compare-wrapper {
      display: flex;
      gap: 24px;
      margin-top: 32px;
    }
    .compare-col {
      flex:1;
      padding: 32px;
    }
    .compare-item {
      display: flex;
      align-items: center;
      gap: 12px;
      margin: 18px 0;
    }

    /* guide */
    .steps {
      display: flex;
      justify-content: space-between;
      margin-top: 40px;
      text-align: center;
    }
    .step {
      flex:1;
      position: relative;
    }
    .step-num {
      width: 48px;
      height: 48px;
      background: var(--primary-red);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 16px;
      font-weight: 700;
      font-size: 20px;
    }

    /* faq */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.08);
      padding: 18px 0;
      cursor: pointer;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
    }

    footer {
      border-top: 1px solid rgba(255,255,255,0.05);
      padding: 32px 0;
      font-size: 14px;
      color: var(--text-muted);
      display: flex;
      justify-content: space-between;
    }

    @media (max-width: 1024px) {
      .arena-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .desktop-nav { display: none; }
      .mobile-bottom-nav { display: flex; }
      h1 { font-size: 34px; }
      section { padding: 60px 0; }
      .hero-grid { flex-direction: column; padding-top: 40px; }
      .highlights-grid { grid-template-columns: repeat(2,1fr); }
      .arena-grid { grid-template-columns: 1fr; }
      .compare-wrapper { flex-direction: column; }
      .steps { flex-direction: column; gap: 32px; }
      footer { flex-direction: column; gap: 12px; text-align: center; }
    }