/* roulang page: index */
:root {
      --primary-deep: #0A1A2F;
      --primary-dark: #0D2137;
      --accent-green: #00E676;
      --accent-red: #FF1744;
      --bg-light: #F5F7FA;
      --text-title: #0A1A2F;
      --text-body: #2C3E50;
      --text-muted: #7F8C8D;
      --white: #FFFFFF;
      --card-glass-bg: rgba(255,255,255,0.8);
      --border-light: rgba(10,26,47,0.08);
      --shadow-sm: 0 8px 32px rgba(10,26,47,0.08);
      --shadow-hover: 0 16px 48px rgba(10,26,47,0.14);
      --radius-card: 16px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-number: "Inter", "Roboto", sans-serif;
      --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-body);
      line-height: 1.75;
      font-size: 16px;
      overflow-x: hidden;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    h1, h2, h3, h4, strong {
      color: var(--text-title);
      font-weight: 600;
      letter-spacing: -0.2px;
    }

    h1 {
      font-size: 48px;
      line-height: 1.2;
    }
    h2 {
      font-size: 36px;
      line-height: 1.25;
      margin-bottom: 16px;
    }
    h3 {
      font-size: 24px;
      line-height: 1.35;
    }
    .section-lead {
      font-size: 18px;
      color: var(--text-muted);
      margin-bottom: 40px;
    }

    img {
      max-width: 100%;
      display: block;
      border-radius: var(--radius-card);
    }

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

    /* 导航栏 */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(10, 26, 47, 0.92);
      backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(0,230,118,0.2);
      z-index: 100;
      padding: 16px 0;
      transition: background var(--transition), box-shadow var(--transition);
    }
    .nav.scrolled {
      background: rgba(10, 26, 47, 0.98);
      box-shadow: 0 8px 20px rgba(0,0,0,0.25);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 24px;
      font-weight: 700;
      color: var(--white);
      letter-spacing: 0.8px;
    }
    .logo-icon {
      width: 32px;
      height: 32px;
      background: var(--accent-green);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
    }
    .logo-icon::after {
      content: "⚽";
      font-size: 20px;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      color: rgba(255,255,255,0.8);
      font-weight: 500;
      font-size: 15px;
      transition: color var(--transition);
      padding: 6px 0;
      border-bottom: 2px solid transparent;
    }
    .nav-links a:hover {
      color: var(--accent-green);
      border-bottom-color: var(--accent-green);
    }
    .btn-nav {
      background: var(--accent-green);
      color: #0A1A2F !important;
      padding: 10px 24px !important;
      border-radius: var(--radius-btn);
      font-weight: 700;
      letter-spacing: 0.5px;
      transition: all var(--transition);
      box-shadow: 0 0 12px rgba(0,230,118,0.4);
    }
    .btn-nav:hover {
      box-shadow: 0 0 22px rgba(0,230,118,0.7);
      transform: translateY(-1px);
    }
    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      color: white;
      font-size: 28px;
      cursor: pointer;
    }

    /* 首屏 */
    .hero {
      background: linear-gradient(135deg, #0A1A2F 0%, #0D2137 100%);
      min-height: 85vh;
      display: flex;
      align-items: center;
      padding: 120px 0 80px;
      position: relative;
      overflow: hidden;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
    }
    .hero-text {
      flex: 1;
    }
    .hero-text h1 {
      color: white;
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 18px;
      color: rgba(255,255,255,0.8);
      margin-bottom: 32px;
      max-width: 500px;
    }
    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent-green);
      color: #0A1A2F;
      font-weight: 700;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      border: none;
      font-size: 16px;
      letter-spacing: 0.5px;
      transition: all var(--transition);
      box-shadow: 0 0 18px rgba(0,230,118,0.55);
      cursor: pointer;
      display: inline-block;
    }
    .btn-primary:hover {
      box-shadow: 0 0 30px rgba(0,230,118,0.8);
      transform: translateY(-2px);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--accent-green);
      color: var(--accent-green);
      font-weight: 600;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-size: 16px;
      letter-spacing: 0.5px;
      transition: all var(--transition);
      cursor: pointer;
    }
    .btn-outline:hover {
      background: rgba(0,230,118,0.08);
      box-shadow: 0 0 20px rgba(0,230,118,0.3);
    }
    .hero-image {
      flex: 1;
      position: relative;
    }
    .hero-image img {
      border-radius: 24px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.5), 0 0 0 2px rgba(0,230,118,0.3);
      width: 100%;
    }
    .blur-circle {
      position: absolute;
      width: 250px;
      height: 250px;
      border-radius: 50%;
      filter: blur(100px);
      opacity: 0.25;
      pointer-events: none;
    }
    .circle-green {
      background: #00E676;
      top: -50px;
      right: 10%;
    }
    .circle-red {
      background: #FF1744;
      bottom: -30px;
      left: 5%;
    }

    /* 通用section */
    section {
      padding: 90px 0;
    }
    .section-title {
      text-align: center;
      margin-bottom: 20px;
    }

    /* 核心优势 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 28px;
    }
    .feature-card {
      background: var(--card-glass-bg);
      backdrop-filter: blur(16px);
      border: 1px solid rgba(255,255,255,0.3);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
      transition: all var(--transition);
    }
    .feature-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--shadow-hover), 0 0 22px rgba(0,230,118,0.25);
    }
    .feature-icon {
      font-size: 36px;
      color: var(--accent-green);
      margin-bottom: 20px;
    }

    /* 产品功能 tabs */
    .product-tabs {
      display: flex;
      gap: 16px;
      justify-content: center;
      margin-bottom: 40px;
    }
    .tab-btn {
      background: white;
      border: 1px solid var(--border-light);
      padding: 10px 28px;
      border-radius: 30px;
      font-weight: 600;
      color: var(--text-title);
      cursor: pointer;
      transition: all var(--transition);
    }
    .tab-btn.active {
      background: var(--accent-green);
      color: #0A1A2F;
      border-color: transparent;
      box-shadow: 0 6px 18px rgba(0,230,118,0.3);
    }
    .tab-content {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .tab-panel {
      display: none;
    }
    .tab-panel.active {
      display: grid;
    }
    .tab-text h3 {
      margin-bottom: 16px;
    }

    /* 场景区 */
    .scenario-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }
    .scenario-row.reverse {
      flex-direction: row-reverse;
    }
    .scenario-img {
      flex:1;
    }
    .scenario-text {
      flex:1;
    }

    /* 案例数据 */
    .stats-grid {
      display: flex;
      justify-content: space-around;
      text-align: center;
      flex-wrap: wrap;
      gap: 30px;
    }
    .stat-item h3 {
      font-size: 48px;
      color: var(--accent-green);
      font-family: var(--font-number);
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid rgba(10,26,47,0.06);
      padding: 20px 0;
      cursor: pointer;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 700;
      font-size: 18px;
      color: var(--text-title);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-body);
      padding-right: 20px;
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      margin-top: 12px;
    }

    /* CTA */
    .cta-section {
      background: linear-gradient(135deg, #0A1A2F, #0D2137);
      border-radius: 32px;
      text-align: center;
      padding: 80px 40px;
      color: white;
    }

    /* 页脚 */
    .footer {
      background: #0A1A2F;
      color: rgba(255,255,255,0.7);
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .footer a {
      color: rgba(255,255,255,0.6);
      display: block;
      margin-bottom: 8px;
    }
    .copyright {
      border-top: 1px solid rgba(255,255,255,0.1);
      margin-top: 40px;
      padding-top: 20px;
      text-align: center;
    }

    @media (max-width: 992px) {
      .features-grid { grid-template-columns: repeat(2,1fr); }
      .hero-grid { flex-direction: column; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .mobile-toggle { display: block; }
      h1 { font-size: 32px; }
      h2 { font-size: 26px; }
      .tab-content { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }