/* roulang page: index */
:root {
      --primary-bg: #0A0E14;
      --action-yellow: #E6FF00;
      --accent-red: #FF4D15;
      --surface-warm: #F4F4F0;
      --white: #FFFFFF;
      --text-dark: #0A0E14;
      --text-muted-dark: #5A6068;
      --text-light: #FFFFFF;
      --text-muted-light: #B0B8C1;
      --border-light: #E0E0E0;
      --border-dark: #2A2E35;
      --footer-bg: #11161C;
      --font-heading: 'Oswald', sans-serif;
      --font-body: 'Inter', system-ui, -apple-system, sans-serif;
      --font-mono: 'JetBrains Mono', monospace;
      --radius-sm: 4px;
      --radius-none: 0px;
      --shadow-card: 0 8px 20px rgba(0,0,0,0.04);
      --transition-smooth: 0.25s cubic-bezier(0.2, 0.0, 0, 1.0);
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-body);
      background-color: var(--white);
      color: var(--text-dark);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      color: inherit;
      text-decoration: none;
    }
    button, .btn {
      cursor: pointer;
      font-family: var(--font-body);
      border: none;
      background: none;
      transition: var(--transition-smooth);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      font-weight: 600;
      letter-spacing: 0.3px;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }
    /* 导航栏 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(10, 14, 20, 0.75);
      backdrop-filter: blur(12px);
      transition: background 0.3s, border-bottom 0.3s;
      border-bottom: 1px solid transparent;
    }
    .header.scrolled {
      background: #0A0E14;
      border-bottom: 1px solid var(--action-yellow);
    }
    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      font-family: var(--font-heading);
      font-size: 28px;
      font-weight: 700;
      letter-spacing: 1px;
      color: var(--white);
      text-transform: uppercase;
      display: flex;
      align-items: center;
    }
    .logo span {
      color: var(--action-yellow);
      margin-left: 4px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 2.5rem;
    }
    .nav-links a {
      color: var(--text-muted-light);
      font-weight: 500;
      font-size: 15px;
      transition: color 0.2s;
      position: relative;
    }
    .nav-links a:hover, .nav-links a.active {
      color: var(--white);
    }
    .btn-primary {
      background: var(--action-yellow);
      color: var(--primary-bg);
      padding: 0.7rem 1.8rem;
      border-radius: 50px;
      font-weight: 700;
      font-size: 15px;
      letter-spacing: 0.5px;
      box-shadow: 0 0 12px rgba(230, 255, 0, 0.2);
      transition: all 0.3s;
    }
    .btn-primary:hover {
      background: #f0ff33;
      box-shadow: 0 0 20px rgba(230, 255, 0, 0.5);
      transform: scale(1.02);
    }
    .btn-outline {
      border: 1px solid var(--white);
      color: var(--white);
      padding: 0.7rem 1.8rem;
      border-radius: 50px;
      font-weight: 600;
      background: transparent;
    }
    .btn-outline:hover {
      background: rgba(255,255,255,0.05);
      border-color: var(--action-yellow);
      color: var(--action-yellow);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
    }
    .hamburger span {
      width: 26px;
      height: 2px;
      background: var(--white);
      transition: 0.3s;
    }
    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: var(--primary-bg);
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: flex-start;
      padding: 2rem;
      transform: translateX(100%);
      transition: transform 0.35s ease;
      z-index: 999;
    }
    .mobile-menu.active {
      transform: translateX(0);
    }
    .mobile-menu a {
      font-size: 2rem;
      font-weight: 600;
      color: var(--white);
      margin: 1rem 0;
      letter-spacing: 1px;
    }
    /* Hero */
    .hero {
      background-color: var(--primary-bg);
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      min-height: 100vh;
      display: flex;
      align-items: center;
      padding-top: 72px;
    }
    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 30% 40%, rgba(10,14,20,0.7) 0%, #0A0E14 95%);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3rem;
      align-items: center;
    }
    .hero-left h1 {
      font-family: var(--font-heading);
      font-size: clamp(3rem, 7vw, 5rem);
      font-weight: 700;
      line-height: 1.1;
      color: var(--white);
      text-transform: uppercase;
      letter-spacing: -1px;
    }
    .hero-left h1 span {
      color: var(--action-yellow);
      display: inline-block;
      border-bottom: 4px solid var(--action-yellow);
    }
    .hero-desc {
      color: var(--text-muted-light);
      font-size: 1.2rem;
      margin: 1.5rem 0 2rem;
      max-width: 500px;
    }
    .hero-actions {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }
    .hero-right {
      background: rgba(20, 24, 30, 0.7);
      backdrop-filter: blur(8px);
      border: 1px solid var(--border-dark);
      padding: 2rem;
      border-radius: var(--radius-sm);
      display: flex;
      flex-direction: column;
      gap: 1.5rem;
    }
    .live-badge {
      color: var(--accent-red);
      font-weight: 700;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .stat-row {
      display: flex;
      justify-content: space-between;
      font-family: var(--font-mono);
    }
    .stat-value {
      font-size: 2rem;
      font-weight: 700;
      color: var(--action-yellow);
    }
    /* 板块通用 */
    section {
      padding: 5rem 0;
    }
    .section-title h2 {
      font-family: var(--font-heading);
      font-size: 2.8rem;
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: -0.5px;
      margin-bottom: 0.5rem;
      color: var(--text-dark);
    }
    .section-sub {
      color: var(--text-muted-dark);
      max-width: 600px;
    }
    /* 仪表盘 */
    .dashboard-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 1.5rem;
      margin-top: 2.5rem;
    }
    .dash-card {
      background: var(--primary-bg);
      border: 1px solid var(--border-dark);
      padding: 2rem 1.5rem;
      color: var(--white);
      border-radius: var(--radius-sm);
    }
    .dash-icon {
      font-size: 2rem;
      margin-bottom: 1rem;
    }
    .dash-number {
      font-family: var(--font-mono);
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--action-yellow);
    }
    /* 服务矩阵 */
    .services-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr;
      gap: 1.5rem;
      margin-top: 2.5rem;
    }
    .service-card-large {
      background: var(--surface-warm);
      padding: 2.5rem;
      border-radius: var(--radius-sm);
      transition: var(--transition-smooth);
      border-top: 4px solid transparent;
    }
    .service-card-large:hover {
      background: white;
      border-top-color: var(--action-yellow);
      transform: translateY(-4px);
    }
    .service-small-group {
      display: flex;
      flex-direction: column;
      gap: 1.5rem;
    }
    .service-card {
      background: var(--surface-warm);
      padding: 2rem;
      border-radius: var(--radius-sm);
      transition: var(--transition-smooth);
      border-top: 4px solid transparent;
    }
    .service-card:hover {
      background: white;
      border-top-color: var(--action-yellow);
      transform: translateY(-4px);
    }
    .comparison-section {
      background: var(--surface-warm);
    }
    .compare-bar {
      margin: 2rem 0;
    }
    .bar-label {
      font-weight: 600;
      margin-bottom: 0.5rem;
    }
    .progress {
      height: 24px;
      background: #ddd;
      border-radius: 2px;
      overflow: hidden;
    }
    .progress-fill {
      height: 100%;
      width: 30%;
      background: #9aa0a8;
      transition: width 1.2s ease-out;
    }
    .progress-fill.vsport {
      width: 95%;
      background: var(--action-yellow);
      box-shadow: 0 0 8px rgba(230,255,0,0.6);
    }
    .faq-list {
      margin-top: 2rem;
      border-top: 1px solid var(--border-light);
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 1.2rem 0;
      cursor: pointer;
    }
    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-muted-dark);
      padding-left: 20px;
      border-left: 3px solid transparent;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 1rem;
      border-left-color: var(--accent-red);
    }
    .cta-band {
      background: var(--primary-bg);
      background-image: url('/assets/images/backpic/back-2.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      text-align: center;
      padding: 6rem 0;
    }
    .cta-band::before {
      content: '';
      position: absolute;
      inset: 0;
      background: rgba(10,14,20,0.85);
    }
    .cta-content {
      position: relative;
      z-index: 2;
      color: white;
    }
    .footer {
      background: var(--footer-bg);
      color: var(--text-muted-light);
      padding: 2.5rem 0;
      border-top: 2px solid var(--action-yellow);
    }
    .footer-grid {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
    }
    @media (max-width: 1024px) {
      .hero-content { grid-template-columns: 1fr; }
      .dashboard-grid { grid-template-columns: repeat(2,1fr); }
      .services-grid { grid-template-columns: 1fr; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .hero { min-height: auto; padding: 6rem 0 3rem; }
      .footer-grid { flex-direction: column; gap: 1rem; text-align: center; }
      .dashboard-grid { grid-template-columns: 1fr; }
    }