/* roulang page: index */
:root {
      --primary-deep: #1A1A1A;
      --accent-red: #E63946;
      --bg-warm: #F5F3EF;
      --card-white: #FFFFFF;
      --success-green: #2A9D8F;
      --text-gray: #6C757D;
      --border-light: #E8E8E8;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 30px rgba(0,0,0,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
    }
    * {
      box-sizing: border-box;
    }
    body {
      margin: 0;
      font-family: -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-warm);
      color: var(--primary-deep);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    h1, h2, h3 {
      margin: 0;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    img {
      max-width: 100%;
      display: block;
    }
    button, input {
      font-family: inherit;
    }
    /* 导航 */
    #nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 50;
      transition: background 0.3s ease, backdrop-filter 0.3s ease;
      background: transparent;
      backdrop-filter: blur(0px);
    }
    #nav.scrolled {
      background: rgba(26,26,26,0.95);
      backdrop-filter: blur(12px);
      box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    }
    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo-text {
      font-size: 22px;
      font-weight: 700;
      color: #FFFFFF;
      letter-spacing: -0.3px;
      white-space: nowrap;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      color: #FFFFFF;
      font-size: 16px;
      font-weight: 500;
      transition: color 0.2s;
      border-bottom: 2px solid transparent;
      padding-bottom: 4px;
    }
    .nav-links a:hover {
      color: var(--accent-red);
      border-bottom-color: var(--accent-red);
    }
    .btn-nav-cta {
      background: var(--accent-red);
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: background 0.2s;
      margin-left: 8px;
    }
    .btn-nav-cta:hover {
      background: #C1121F;
    }
    /* 移动端底部导航 */
    .mobile-bottom-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background: #FFFFFF;
      border-top: 1px solid var(--border-light);
      justify-content: space-around;
      padding: 8px 12px;
      z-index: 50;
      box-shadow: 0 -2px 12px rgba(0,0,0,0.04);
    }
    .mobile-nav-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      color: #6C757D;
      font-size: 12px;
      transition: color 0.2s;
    }
    .mobile-nav-item i {
      font-size: 20px;
      margin-bottom: 2px;
    }
    .mobile-nav-item.active {
      color: var(--accent-red);
    }
    /* Hero */
    #hero {
      min-height: 100vh;
      background: linear-gradient(135deg, #1A1A1A 0%, #2B2B2B 100%);
      display: flex;
      align-items: center;
      padding-top: 72px;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .hero-text h1 {
      font-size: 56px;
      font-weight: 700;
      color: white;
      line-height: 1.2;
      letter-spacing: -0.5px;
      margin-bottom: 24px;
    }
    .hero-sub {
      font-size: 18px;
      color: rgba(255,255,255,0.8);
      margin-bottom: 40px;
      max-width: 500px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent-red);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      transition: background 0.2s;
      border: none;
      cursor: pointer;
    }
    .btn-primary:hover {
      background: #C1121F;
    }
    .btn-outline {
      background: transparent;
      border: 2px solid white;
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      transition: all 0.2s;
      cursor: pointer;
    }
    .btn-outline:hover {
      background: white;
      color: #1A1A1A;
    }
    .hero-visual {
      background: rgba(255,255,255,0.05);
      border: 2px dashed rgba(255,255,255,0.25);
      border-radius: 16px;
      height: 320px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: rgba(255,255,255,0.6);
      font-size: 18px;
      background-image: url('/assets/images/coverpic/cover-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      overflow: hidden;
    }
    .hero-visual::after {
      content: "赛事数据实时呈现";
      position: absolute;
      bottom: 20px;
      right: 20px;
      background: rgba(0,0,0,0.6);
      color: white;
      padding: 6px 16px;
      border-radius: 20px;
      font-size: 14px;
    }
    /* 通用板块 */
    section {
      padding: 120px 0;
    }
    .section-title {
      font-size: 40px;
      font-weight: 700;
      margin-bottom: 16px;
      color: #1A1A1A;
    }
    .section-sub {
      color: #6C757D;
      max-width: 600px;
      margin-bottom: 48px;
      font-size: 18px;
    }
    /* 核心优势 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .feature-card {
      background: var(--card-white);
      padding: 32px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: all 0.25s ease;
      text-align: left;
    }
    .feature-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .feature-icon {
      font-size: 40px;
      color: var(--accent-red);
      margin-bottom: 24px;
      transition: transform 0.2s;
    }
    .feature-card:hover .feature-icon {
      transform: rotate(5deg);
    }
    .feature-card h3 {
      font-size: 22px;
      font-weight: 600;
      margin-bottom: 12px;
    }
    .feature-card p {
      color: #6C757D;
      font-size: 16px;
      line-height: 1.6;
    }
    /* 数据背书 */
    .stats-container {
      display: flex;
      justify-content: center;
      align-items: center;
      gap: 64px;
      flex-wrap: wrap;
    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-size: 48px;
      font-weight: 800;
      color: var(--accent-red);
      line-height: 1.2;
    }
    .stat-label {
      color: #6C757D;
      font-size: 14px;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }
    .stat-divider {
      width: 1px;
      height: 60px;
      background: #D1D1D1;
    }
    /* 案例卡片 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }
    .case-card {
      border-radius: var(--radius-card);
      overflow: hidden;
      position: relative;
      height: 280px;
      background-size: cover;
      background-position: center;
      box-shadow: var(--shadow-card);
      transition: all 0.25s ease;
    }
    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .case-overlay {
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      padding: 24px;
      background: linear-gradient(transparent, rgba(0,0,0,0.75));
      color: white;
    }
    .case-tag {
      background: var(--success-green);
      color: white;
      font-size: 12px;
      padding: 4px 12px;
      border-radius: 20px;
      display: inline-block;
      margin-bottom: 8px;
    }
    .case-name {
      font-size: 20px;
      font-weight: 700;
      margin-bottom: 6px;
    }
    .case-desc {
      font-size: 14px;
      opacity: 0.9;
    }
    /* 解决方案图文交错 */
    .solution-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
      margin-bottom: 80px;
    }
    .solution-img {
      background: #e9e9e9;
      border-radius: var(--radius-card);
      height: 280px;
      background-size: cover;
      background-position: center;
      border: 1px dashed #aaa;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #6C757D;
    }
    .solution-content h3 {
      font-size: 28px;
      font-weight: 700;
      margin-bottom: 16px;
    }
    .solution-list {
      list-style: none;
      padding: 0;
      margin-bottom: 24px;
    }
    .solution-list li {
      margin-bottom: 12px;
      display: flex;
      align-items: center;
      gap: 8px;
      color: #2d2d2d;
    }
    .solution-list i {
      color: var(--accent-red);
    }
    .text-link {
      color: var(--accent-red);
      font-weight: 600;
      cursor: pointer;
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid #e0e0e0;
      margin-bottom: 8px;
    }
    .faq-question {
      width: 100%;
      background: transparent;
      border: none;
      padding: 20px 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 18px;
      font-weight: 600;
      cursor: pointer;
      text-align: left;
      color: #1A1A1A;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      color: #4a4a4a;
      padding-left: 8px;
    }
    .faq-answer.open {
      max-height: 200px;
      padding-bottom: 16px;
      border-top: 1px solid var(--accent-red);
    }
    /* 全局CTA */
    .cta-box {
      background: #FFFFFF;
      border-radius: 20px;
      padding: 60px;
      text-align: center;
    }
    .cta-form {
      display: flex;
      max-width: 480px;
      margin: 32px auto 0;
      border-radius: var(--radius-btn);
      overflow: hidden;
      box-shadow: 0 4px 12px rgba(0,0,0,0.04);
    }
    .cta-form input {
      flex: 1;
      border: 1px solid #D1D1D1;
      padding: 14px 20px;
      font-size: 16px;
      outline: none;
      border-radius: var(--radius-btn) 0 0 var(--radius-btn);
    }
    .cta-form input:focus {
      border-color: var(--accent-red);
    }
    .cta-form button {
      background: var(--accent-red);
      color: white;
      border: none;
      padding: 14px 28px;
      font-weight: 600;
      border-radius: 0 var(--radius-btn) var(--radius-btn) 0;
      cursor: pointer;
    }
    /* 页脚 */
    footer {
      background: #1A1A1A;
      color: #AAAAAA;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .footer-logo {
      color: white;
      font-size: 20px;
      font-weight: 700;
      margin-bottom: 12px;
    }
    .footer-links h4 {
      color: white;
      font-size: 14px;
      font-weight: 600;
      margin-bottom: 16px;
    }
    .footer-links a {
      display: block;
      color: #AAAAAA;
      margin-bottom: 10px;
      font-size: 14px;
    }
    .footer-links a:hover {
      color: var(--accent-red);
    }
    .copyright {
      margin-top: 40px;
      font-size: 12px;
      text-align: center;
      border-top: 1px solid #333;
      padding-top: 20px;
    }
    @media (max-width: 1024px) {
      .features-grid { grid-template-columns: repeat(2, 1fr); }
      .cases-grid { grid-template-columns: 1fr; }
    }
    @media (max-width: 768px) {
      .desktop-nav { display: none; }
      .mobile-bottom-nav { display: flex; }
      #nav { background: rgba(26,26,26,0.95); backdrop-filter: blur(12px); }
      .hero-grid { grid-template-columns: 1fr; }
      .hero-text h1 { font-size: 36px; }
      section { padding: 80px 0; }
      .section-title { font-size: 28px; }
      .features-grid { grid-template-columns: 1fr; }
      .stats-container { flex-direction: column; gap: 24px; }
      .stat-divider { display: none; }
      .solution-row { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .cta-box { padding: 32px 20px; }
    }