/* roulang page: index */
:root {
      --primary: #1B8E3F;
      --primary-dark: #157A33;
      --accent-gold: #F5A623;
      --deep-green: #0F2B1A;
      --warm-bg: #F9F9F5;
      --white: #FFFFFF;
      --text-dark: #1A1A1A;
      --text-body: #4A4A4A;
      --text-muted: #7A7A7A;
      --border-light: #E8E8E0;
      --alert-red: #D0021B;
      --shadow-sm: 0 2px 12px rgba(0, 0, 0, 0.06);
      --shadow-md: 0 6px 20px rgba(0, 0, 0, 0.1);
      --shadow-btn: 0 4px 10px rgba(27, 142, 63, 0.3);
      --shadow-btn-hover: 0 6px 16px rgba(27, 142, 63, 0.45);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --radius-container: 16px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans CJK SC", sans-serif;
      --font-number: "Inter", "SF Pro Display", system-ui, sans-serif;
      --transition: all 0.25s ease;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--warm-bg);
      color: var(--text-body);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      transition: var(--transition);
    }

    /* 导航栏 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: var(--white);
      z-index: 100;
      height: 64px;
      box-shadow: 0 1px 0 rgba(0,0,0,0.04);
      transition: box-shadow 0.2s;
    }
    .header.scrolled {
      box-shadow: 0 1px 8px rgba(0,0,0,0.06);
    }
    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 64px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 22px;
      color: var(--primary);
      letter-spacing: -0.3px;
    }
    .logo-icon {
      width: 36px;
      height: 36px;
      background: linear-gradient(135deg, var(--primary), #0F5C2A);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 20px;
      position: relative;
    }
    .logo-icon::after {
      content: "⚽";
      font-size: 22px;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
      list-style: none;
    }
    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-body);
      padding: 8px 0;
      border-bottom: 3px solid transparent;
    }
    .nav-links a:hover, .nav-links a.active {
      color: var(--primary);
      border-bottom-color: var(--primary);
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      font-weight: 600;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      box-shadow: var(--shadow-btn);
      font-size: 15px;
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      box-shadow: var(--shadow-btn-hover);
      transform: scale(1.02);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      font-weight: 600;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
    }
    .btn-outline:hover {
      background: rgba(27,142,63,0.08);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      padding: 10px;
    }
    .hamburger span {
      width: 24px;
      height: 2.5px;
      background: var(--text-dark);
      border-radius: 2px;
    }
    .mobile-menu {
      display: none;
    }

    /* Hero */
    .hero {
      background: linear-gradient(180deg, var(--deep-green) 0%, #1B5E2E 70%, var(--primary) 100%);
      min-height: 90vh;
      display: flex;
      align-items: center;
      padding-top: 64px;
      position: relative;
      overflow: hidden;
    }
    .hero-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 40px;
      flex-wrap: wrap;
    }
    .hero-text {
      flex: 1 1 400px;
      color: white;
    }
    .hero h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 20px;
    }
    .hero h1 span {
      color: var(--accent-gold);
    }
    .hero-sub {
      font-size: 18px;
      opacity: 0.9;
      margin-bottom: 32px;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-image {
      flex: 1 1 400px;
      position: relative;
      border-radius: 24px;
      overflow: hidden;
      box-shadow: 0 20px 40px rgba(0,0,0,0.3);
    }
    .hero-image img {
      width: 100%;
      object-fit: cover;
    }

    /* 通用板块 */
    section {
      padding: 80px 0;
    }
    .section-title {
      font-size: 32px;
      font-weight: 600;
      color: var(--text-dark);
      text-align: center;
      margin-bottom: 48px;
    }

    /* 核心优势 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .feature-card {
      background: var(--white);
      padding: 32px 20px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: var(--transition);
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .feature-icon {
      width: 64px;
      height: 64px;
      background: rgba(27,142,63,0.1);
      border-radius: 50%;
      margin: 0 auto 16px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 28px;
    }
    .feature-card h3 {
      font-size: 20px;
      margin-bottom: 10px;
      color: var(--text-dark);
    }

    /* 功能分组 */
    .func-group {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }
    .func-group.reverse {
      flex-direction: row-reverse;
    }
    .func-img {
      flex: 1;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .func-text {
      flex: 1;
    }
    .func-text h3 {
      font-size: 26px;
      margin-bottom: 16px;
    }

    /* 场景卡片 */
    .scenarios-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .scenario-card {
      background: var(--white);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .scenario-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-md);
    }
    .scenario-img {
      height: 180px;
      object-fit: cover;
    }

    /* 数据面板 */
    .stats-panel {
      background: linear-gradient(105deg, #F0F7F0 0%, #EAF4EA 100%);
      border-radius: var(--radius-container);
      padding: 48px;
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
      text-align: center;
    }
    .stat-number {
      font-family: var(--font-number);
      font-size: 48px;
      font-weight: 800;
      color: var(--primary);
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }
    .faq-question {
      width: 100%;
      padding: 20px 16px;
      background: var(--warm-bg);
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      font-size: 17px;
      color: var(--text-dark);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      background: white;
      padding: 0 16px;
    }
    .faq-answer p {
      padding: 16px 0;
    }

    /* 下载区 */
    .download {
      background: var(--deep-green);
      color: white;
      text-align: center;
      border-radius: 0;
    }
    .download .btn-primary {
      background: var(--accent-gold);
      color: #1A1A1A;
      box-shadow: 0 4px 14px rgba(245,166,35,0.4);
    }

    /* 页脚 */
    .footer {
      background: var(--deep-green);
      color: #CCCCCC;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }

    @media (max-width: 1024px) {
      .features-grid { grid-template-columns: repeat(2,1fr); }
      .func-group { flex-direction: column; }
      .scenarios-grid { grid-template-columns: repeat(2,1fr); }
      .stats-panel { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .nav-links, .header .btn-primary { display: none; }
      .hamburger { display: flex; }
      .mobile-menu.active { display: flex; flex-direction: column; position: absolute; top:64px; left:0; width:100%; background: white; padding:20px; box-shadow:0 10px 20px rgba(0,0,0,0.1); }
      .hero-container { flex-direction: column; text-align: center; }
      .hero h1 { font-size: 36px; }
      .section-title { font-size: 26px; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }