/* roulang page: index */
:root {
      --primary: #45A29E;
      --primary-hover: #5ABFBA;
      --bg-deep: #0B0C10;
      --bg-card: #1F2329;
      --bg-input: #2C3038;
      --text-body: #E0E0E0;
      --text-muted: #9E9E9E;
      --border-card: rgba(69, 162, 158, 0.15);
      --success: #00E676;
      --warning: #FF9100;
      --error: #FF1744;
      --radius-sm: 4px;
      --radius-md: 8px;
      --radius-lg: 12px;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.4);
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --font-mono: 'DIN Alternate', 'Roboto', 'SF Mono', monospace;
      --transition: 200ms ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-deep);
      color: var(--text-body);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 48px;
    }
    img {
      max-width: 100%;
      display: block;
      height: auto;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    button, input {
      font-family: inherit;
    }
    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(11, 12, 16, 0.85);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(69, 162, 158, 0.1);
      z-index: 999;
      transition: var(--transition);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 48px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 1.5rem;
      font-weight: 700;
      letter-spacing: 2px;
      color: var(--primary);
    }
    .logo-icon {
      width: 28px;
      height: 28px;
      border: 2px solid var(--primary);
      border-radius: 50%;
      position: relative;
      transform: rotate(-30deg);
    }
    .logo-icon::after {
      content: "";
      position: absolute;
      top: 4px;
      left: 4px;
      width: 16px;
      height: 16px;
      border: 2px solid var(--primary);
      border-radius: 50%;
      opacity: 0.6;
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-link {
      font-size: 0.85rem;
      letter-spacing: 2px;
      text-transform: uppercase;
      color: var(--text-muted);
      position: relative;
      padding: 8px 0;
      transition: var(--transition);
      font-weight: 500;
    }
    .nav-link::after {
      content: "";
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 200ms;
    }
    .nav-link:hover {
      color: var(--primary);
    }
    .nav-link:hover::after {
      width: 100%;
    }
    .btn-primary {
      background: var(--primary);
      color: var(--bg-deep);
      padding: 10px 24px;
      border-radius: 30px;
      font-weight: 600;
      letter-spacing: 1px;
      border: none;
      cursor: pointer;
      transition: background 0.2s, transform 0.2s;
      display: inline-block;
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      transform: translateY(-2px);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--primary);
      color: var(--primary);
      padding: 10px 24px;
      border-radius: 30px;
      font-weight: 600;
      letter-spacing: 1px;
      transition: background 0.2s, transform 0.2s;
      display: inline-block;
    }
    .btn-outline:hover {
      background: rgba(69, 162, 158, 0.1);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      cursor: pointer;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--text-body);
      transition: var(--transition);
    }
    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 20% 20%, #1a1d2e, #0B0C10 80%);
      position: relative;
      overflow: hidden;
      padding-top: 80px;
    }
    .hero-particles {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      pointer-events: none;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      width: 100%;
    }
    .hero h1 {
      font-size: 3rem;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 1rem;
      color: white;
    }
    .hero .highlight {
      color: var(--primary);
    }
    .hero p {
      font-size: 1.25rem;
      color: var(--text-muted);
      margin-bottom: 2rem;
      max-width: 600px;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 3rem;
    }
    .data-dashboard {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
      margin-top: 2rem;
    }
    .stat-card {
      background: rgba(31, 35, 41, 0.7);
      backdrop-filter: blur(8px);
      border: 1px solid var(--border-card);
      border-radius: var(--radius-md);
      padding: 24px;
      text-align: center;
    }
    .stat-number {
      font-family: var(--font-mono);
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: 1px;
    }
    .stat-label {
      font-size: 0.85rem;
      color: var(--text-muted);
      margin-top: 8px;
      letter-spacing: 0.5px;
    }
    /* 板块通用 */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 2rem;
      font-weight: 700;
      margin-bottom: 1rem;
      color: white;
    }
    .section-subtitle {
      color: var(--text-muted);
      margin-bottom: 3rem;
      font-size: 1.1rem;
    }
    /* 核心优势 */
    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 32px;
      margin-top: 2rem;
    }
    .advantage-item {
      display: flex;
      gap: 24px;
      background: var(--bg-card);
      padding: 28px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-card);
      transition: var(--transition);
    }
    .advantage-item:hover {
      border-color: var(--primary);
      transform: translateY(-4px);
      box-shadow: var(--shadow-card);
    }
    .advantage-icon {
      font-size: 2rem;
      color: var(--primary);
      min-width: 48px;
    }
    .advantage-text h3 {
      font-size: 1.25rem;
      margin-bottom: 8px;
      color: white;
    }
    /* 赛事服务 */
    .service-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .service-card {
      background: var(--bg-card);
      border-radius: var(--radius-md);
      border: 1px solid var(--border-card);
      overflow: hidden;
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .service-card:hover {
      transform: translateY(-6px);
      border-color: var(--primary);
      box-shadow: var(--shadow-card);
    }
    .service-img {
      height: 180px;
      background-size: cover;
      background-position: center;
      position: relative;
    }
    .service-img::after {
      content: "";
      position: absolute;
      top: 0; left: 0; right: 0; bottom: 0;
      background: linear-gradient(180deg, transparent 0%, rgba(11,12,16,0.8) 100%);
    }
    .service-body {
      padding: 24px;
      flex: 1;
    }
    .service-body h3 {
      font-size: 1.3rem;
      margin-bottom: 12px;
    }
    .tags {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin: 16px 0;
    }
    .tag {
      border: 1px solid var(--primary);
      color: var(--primary);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.75rem;
    }
    /* 数据对比 */
    .compare-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .compare-bar {
      display: flex;
      align-items: center;
      gap: 12px;
      margin: 20px 0;
    }
    .bar-label {
      width: 100px;
      font-size: 0.9rem;
    }
    .bar-bg {
      flex: 1;
      height: 24px;
      background: #555;
      border-radius: 4px;
      overflow: hidden;
    }
    .bar-fill {
      height: 100%;
      background: var(--primary);
      width: 0%;
      transition: width 1s ease;
    }
    .bar-fill.old { background: #777; }
    .bar-value {
      font-family: var(--font-mono);
      color: var(--success);
      min-width: 50px;
    }
    /* 案例 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .case-card {
      background: var(--bg-card);
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-card);
    }
    .case-img {
      height: 180px;
      background-size: cover;
    }
    .case-info {
      padding: 24px;
    }
    .case-stat {
      font-family: var(--font-mono);
      color: var(--primary);
      font-size: 1.8rem;
      font-weight: 700;
    }
    /* FAQ */
    .faq-list {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .faq-item {
      background: var(--bg-card);
      border-radius: var(--radius-md);
      border: 1px solid var(--border-card);
      overflow: hidden;
    }
    .faq-question {
      padding: 20px 24px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: white;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      padding: 0 24px;
      color: var(--text-muted);
      border-left: 2px solid var(--primary);
      margin-left: 20px;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 0 24px 20px;
    }
    /* CTA */
    .cta-section {
      background: #0a0b10;
      background-image: radial-gradient(rgba(69,162,158,0.05) 1px, transparent 1px);
      background-size: 30px 30px;
    }
    .cta-form {
      display: flex;
      flex-direction: column;
      gap: 16px;
      max-width: 480px;
      margin: 2rem auto;
    }
    .cta-form input {
      background: var(--bg-input);
      border: 1px solid transparent;
      padding: 14px 18px;
      border-radius: var(--radius-sm);
      color: white;
      font-size: 1rem;
      outline: none;
    }
    .cta-form input:focus {
      border-bottom: 2px solid var(--primary);
    }
    /* 页脚 */
    .footer {
      background: #090A0D;
      padding: 40px 0;
      color: var(--text-muted);
    }
    .footer-content {
      display: flex;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 24px;
    }
    .social-icons i {
      font-size: 1.4rem;
      margin-right: 16px;
      color: var(--text-muted);
      transition: var(--transition);
    }
    .social-icons i:hover {
      color: var(--primary);
    }
    @media (max-width: 1024px) {
      .container { padding: 0 32px; }
      .service-grid, .case-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .container { padding: 0 20px; }
      .nav-menu { display: none; }
      .hamburger { display: flex; }
      .hero h1 { font-size: 2rem; }
      .data-dashboard { grid-template-columns: 1fr; }
      .advantages-grid { grid-template-columns: 1fr; }
      .service-grid, .case-grid { grid-template-columns: 1fr; }
      .compare-wrapper { grid-template-columns: 1fr; }
    }