/* roulang page: index */
:root {
      --primary: #0A4DA4;
      --accent: #F5A623;
      --bg: #F7F9FC;
      --card-bg: #FFFFFF;
      --text-dark: #1E293B;
      --text-muted: #64748B;
      --text-body: #475569;
      --border: #E2E8F0;
      --radius-card: 12px;
      --radius-btn: 8px;
      --shadow-sm: 0 4px 12px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 24px rgba(0,0,0,0.08);
      --transition: 0.3s ease;
      --nav-height: 72px;
      --container-max: 1200px;
      --section-py: 100px;
    }

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

    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
      background-color: var(--bg);
      color: var(--text-body);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

    a {
      text-decoration: none;
      color: inherit;
    }

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 导航 */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background: #FFFFFF;
      box-shadow: 0 2px 8px rgba(0,0,0,0.04);
      z-index: 1000;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: var(--container-max);
      padding: 0 20px;
    }

    .logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.3px;
      white-space: nowrap;
    }

    .nav-menu {
      display: flex;
      gap: 40px;
      align-items: center;
      list-style: none;
    }

    .nav-menu a {
      font-size: 16px;
      color: var(--text-muted);
      font-weight: 500;
      transition: color 0.2s;
      position: relative;
      padding: 4px 0;
    }

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

    .nav-menu a.active::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 100%;
      height: 3px;
      background: var(--accent);
      border-radius: 2px;
    }

    .btn-nav {
      background: var(--accent);
      color: white;
      border: none;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      cursor: pointer;
      transition: background var(--transition), box-shadow var(--transition);
      box-shadow: 0 4px 10px rgba(245,166,35,0.3);
      white-space: nowrap;
    }

    .btn-nav:hover {
      background: #E09515;
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
    }

    .hamburger span {
      width: 25px;
      height: 3px;
      background: var(--primary);
      border-radius: 2px;
      transition: var(--transition);
    }

    @media (max-width: 768px) {
      .nav-menu {
        position: fixed;
        top: var(--nav-height);
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        gap: 24px;
        padding: 32px 20px;
        box-shadow: 0 10px 20px rgba(0,0,0,0.05);
        transform: translateY(-120%);
        transition: transform 0.35s ease;
        z-index: 999;
        display: flex;
      }
      .nav-menu.open {
        transform: translateY(0);
      }
      .hamburger {
        display: flex;
      }
      .btn-nav {
        display: none;
      }
      .nav-container .btn-nav-mobile {
        display: block;
      }
    }

    /* 首屏 */
    .hero {
      padding-top: calc(var(--nav-height) + 60px);
      padding-bottom: 80px;
      background: var(--bg);
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
    }

    .hero-left {
      flex: 0 0 55%;
    }

    .hero-right {
      flex: 1;
      border-radius: 16px;
      overflow: hidden;
      box-shadow: 0 20px 40px rgba(0,0,0,0.1);
    }

    .hero-right img {
      width: 100%;
      height: auto;
      object-fit: cover;
      aspect-ratio: 4/3;
    }

    .hero h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      color: var(--primary);
      margin-bottom: 24px;
      letter-spacing: -0.5px;
    }

    .hero-sub {
      font-size: 18px;
      color: var(--text-muted);
      margin-bottom: 40px;
      max-width: 500px;
    }

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

    .btn-primary {
      background: var(--accent);
      color: white;
      border: none;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      cursor: pointer;
      transition: background var(--transition), box-shadow var(--transition);
      box-shadow: 0 4px 10px rgba(245,166,35,0.3);
      display: inline-block;
    }

    .btn-primary:hover {
      background: #E09515;
    }

    .btn-secondary {
      background: transparent;
      color: var(--primary);
      border: 2px solid var(--primary);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      cursor: pointer;
      transition: all 0.25s ease;
    }

    .btn-secondary:hover {
      background: var(--primary);
      color: white;
    }

    @media (max-width: 768px) {
      .hero-grid {
        flex-direction: column;
        gap: 40px;
      }
      .hero-left {
        text-align: center;
      }
      .hero h1 {
        font-size: 32px;
      }
      .hero-right {
        width: 100%;
        height: 250px;
      }
      .hero-buttons {
        justify-content: center;
      }
    }

    /* 通用板块 */
    .section {
      padding: var(--section-py) 0;
    }

    .section-title {
      font-size: 36px;
      font-weight: 600;
      color: var(--text-dark);
      text-align: center;
      margin-bottom: 16px;
      position: relative;
      display: flex;
      flex-direction: column;
      align-items: center;
    }

    .section-title::after {
      content: '';
      display: block;
      width: 40px;
      height: 4px;
      background: var(--accent);
      border-radius: 4px;
      margin-top: 12px;
    }

    /* 核心优势 */
    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 48px;
    }

    .advantage-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border);
      text-align: center;
      transition: var(--transition);
    }

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

    .icon-circle {
      width: 64px;
      height: 64px;
      background: #E6F0FA;
      border-radius: 50%;
      margin: 0 auto 20px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-size: 28px;
    }

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

    @media (max-width: 768px) {
      .advantages-grid {
        grid-template-columns: 1fr;
      }
      .section-title {
        font-size: 28px;
      }
    }

    /* 赛事服务杂志流 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
      gap: 24px;
      margin-top: 48px;
    }

    .service-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border);
      overflow: hidden;
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }

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

    .service-img {
      height: 200px;
      object-fit: cover;
      width: 100%;
    }

    .service-body {
      padding: 24px;
      display: flex;
      flex-direction: column;
      flex: 1;
    }

    .service-tag {
      background: var(--accent);
      color: white;
      font-size: 12px;
      font-weight: 600;
      padding: 4px 12px;
      border-radius: 20px;
      display: inline-block;
      width: fit-content;
      margin-bottom: 12px;
    }

    .service-card h3 {
      font-size: 20px;
      font-weight: 600;
      color: var(--text-dark);
      margin-bottom: 8px;
    }

    .service-desc {
      color: var(--text-muted);
      margin-bottom: 16px;
    }

    .service-meta {
      margin-top: auto;
      font-size: 14px;
      color: var(--text-muted);
      display: flex;
      justify-content: space-between;
    }

    @media (max-width: 520px) {
      .services-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 数据实力 */
    .data-section {
      background: linear-gradient(180deg, #F7F9FC 0%, #E6F0FA 100%);
    }

    .data-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
      text-align: center;
      margin-top: 48px;
    }

    .data-number {
      font-size: 48px;
      font-weight: 700;
      color: var(--primary);
      line-height: 1.2;
    }

    .data-label {
      font-size: 16px;
      color: var(--text-muted);
    }

    @media (max-width: 768px) {
      .data-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
      margin-top: 48px;
    }

    .faq-item {
      border-left: 4px solid var(--accent);
      padding-left: 20px;
      margin-bottom: 24px;
    }

    .faq-question {
      font-size: 18px;
      font-weight: 500;
      color: var(--text-dark);
      margin-bottom: 8px;
    }

    .faq-answer {
      color: var(--text-body);
    }

    @media (max-width: 768px) {
      .faq-grid {
        grid-template-columns: 1fr;
      }
    }

    /* CTA */
    .cta-block {
      background: #E6F0FA;
      text-align: center;
    }

    .cta-block h2 {
      font-size: 32px;
      font-weight: 600;
      color: var(--text-dark);
    }

    .cta-sub {
      color: var(--text-muted);
      margin: 16px 0 32px;
    }

    .btn-large {
      padding: 18px 48px;
      font-size: 18px;
      background: var(--accent);
      color: white;
      border: none;
      border-radius: var(--radius-btn);
      font-weight: 600;
      cursor: pointer;
      transition: background var(--transition);
    }

    .btn-large:hover {
      background: #E09515;
    }

    /* 页脚 */
    .footer {
      background: #1E293B;
      color: #CBD5E1;
      padding: 60px 0 0;
    }

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

    .footer-logo {
      font-size: 24px;
      font-weight: 700;
      color: white;
      margin-bottom: 16px;
    }

    .footer-desc {
      color: #94A3B8;
    }

    .footer h4 {
      color: white;
      margin-bottom: 20px;
    }

    .footer ul {
      list-style: none;
    }

    .footer li {
      margin-bottom: 12px;
    }

    .footer a {
      color: #CBD5E1;
      transition: color 0.2s;
    }

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

    .copyright {
      background: #0F172A;
      text-align: center;
      padding: 20px;
      font-size: 14px;
      color: #94A3B8;
    }

    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 520px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }

    html {
      scroll-behavior: smooth;
    }