/* roulang page: index */
/* ----- 设计变量与全局重置 ----- */
    :root {
      --primary-green: #1E8C3E;
      --accent-orange: #FF6B00;
      --deep-black: #1A1C20;
      --cloud-white: #F8F9FA;
      --pure-white: #FFFFFF;
      --text-body: #2C2F33;
      --text-light: #5F6368;
      --border-light: #E9ECEF;
      --shadow-sm: 0 4px 12px rgba(0,0,0,0.04);
      --shadow-md: 0 12px 24px rgba(0,0,0,0.08);
      --shadow-hover: 0 16px 32px rgba(0,0,0,0.12);
      --radius-card: 16px;
      --radius-btn: 8px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --font-data: "Inter", "DIN Alternate", "Segoe UI", sans-serif;
      --transition-smooth: all 0.25s ease;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--cloud-white);
      color: var(--text-body);
      line-height: 1.6;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }

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

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

    button {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: transparent;
      outline: none;
      transition: var(--transition-smooth);
    }

    ul {
      list-style: none;
    }

    /* ----- 导航系统 (白底平台导航) ----- */
    .main-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.96);
      backdrop-filter: blur(8px);
      box-shadow: 0 1px 0 var(--border-light);
      transition: box-shadow 0.2s ease;
    }
    .main-header.scrolled {
      box-shadow: 0 4px 12px rgba(0,0,0,0.04);
    }
    .nav-bar {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 16px 0;
    }
    .brand {
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .brand-logo {
      font-size: 28px;
      font-weight: 900;
      color: var(--primary-green);
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 4px;
    }
    .brand-logo i {
      font-size: 32px;
      color: var(--accent-orange);
    }
    .brand-domain {
      font-size: 14px;
      color: var(--text-light);
      font-weight: 400;
      margin-left: 4px;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      font-weight: 500;
      font-size: 1rem;
      color: var(--text-body);
      padding: 8px 0;
      position: relative;
      white-space: nowrap;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background-color: var(--primary-green);
      transition: width 0.2s ease;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary-green);
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    .nav-cta {
      background: var(--accent-orange);
      color: white !important;
      padding: 10px 22px !important;
      border-radius: var(--radius-btn);
      font-weight: 600;
      box-shadow: 0 4px 10px rgba(255,107,0,0.3);
    }
    .nav-cta:hover {
      background: #e65d00 !important;
      transform: scale(1.02);
    }
    .nav-cta::after {
      display: none;
    }
    .hamburger {
      display: none;
      font-size: 26px;
      color: var(--deep-black);
    }

    /* 移动端导航 */
    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 75%;
        max-width: 320px;
        height: 100vh;
        background: var(--pure-white);
        flex-direction: column;
        padding: 80px 30px 30px;
        box-shadow: -8px 0 30px rgba(0,0,0,0.1);
        transition: right 0.3s ease;
        gap: 24px;
        align-items: flex-start;
      }
      .nav-links.active {
        right: 0;
      }
      .hamburger {
        display: block;
        z-index: 110;
      }
      .nav-cta {
        width: 100%;
        text-align: center;
      }
    }

    /* ----- 板块通用间距 ----- */
    section {
      padding: 90px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
    }

    /* ----- 按钮系统 ----- */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      transition: var(--transition-smooth);
      font-size: 1rem;
      border: 2px solid transparent;
    }
    .btn-primary {
      background: var(--accent-orange);
      color: white;
      border-color: var(--accent-orange);
      box-shadow: 0 8px 16px rgba(255,107,0,0.25);
    }
    .btn-primary:hover {
      background: #e65d00;
      border-color: #e65d00;
      transform: scale(1.02);
      box-shadow: 0 12px 22px rgba(255,107,0,0.35);
    }
    .btn-outline {
      border: 2px solid var(--primary-green);
      color: var(--primary-green);
      background: transparent;
    }
    .btn-outline:hover {
      background: var(--primary-green);
      color: white;
      border-color: var(--primary-green);
    }

    /* ----- Hero 首屏 ----- */
    .hero-section {
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center 30%;
      position: relative;
      padding: 110px 0 120px;
      display: flex;
      align-items: center;
    }
    .hero-overlay {
      position: absolute;
      top:0;left:0;right:0;bottom:0;
      background: linear-gradient(90deg, rgba(26,28,32,0.82) 0%, rgba(26,28,32,0.5) 70%);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 40px;
    }
    .hero-text {
      flex: 1 1 500px;
      color: white;
    }
    .hero-text h1 {
      font-size: 48px;
      font-weight: 900;
      line-height: 1.2;
      margin-bottom: 20px;
    }
    .hero-text p {
      font-size: 1.2rem;
      opacity: 0.9;
      margin-bottom: 30px;
      max-width: 520px;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .live-card {
      flex: 0 0 320px;
      background: rgba(255,255,255,0.15);
      backdrop-filter: blur(12px);
      border-radius: var(--radius-card);
      padding: 24px;
      color: white;
      border: 1px solid rgba(255,255,255,0.25);
      box-shadow: 0 20px 30px rgba(0,0,0,0.3);
    }
    .live-badge {
      display: inline-block;
      background: #ff3b30;
      font-size: 12px;
      font-weight: 700;
      padding: 2px 10px;
      border-radius: 20px;
      margin-bottom: 16px;
      animation: pulse 1.5s infinite;
    }
    .match-row {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 20px;
      font-weight: 700;
      font-family: var(--font-data);
    }
    @media (max-width: 768px) {
      .hero-text h1 { font-size: 32px; }
      .live-card { flex: 1 1 auto; width: 100%; }
    }
    @keyframes pulse { 0% { opacity: 1; } 50% { opacity: 0.7; } 100% { opacity: 1; } }

    /* ----- 服务板块 (非对称布局) ----- */
    .services-grid {
      display: flex;
      gap: 40px;
      align-items: center;
      flex-wrap: wrap;
    }
    .service-left {
      flex: 1 1 480px;
    }
    .service-left img {
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-md);
      width: 100%;
    }
    .service-right {
      flex: 1 1 400px;
      display: flex;
      flex-direction: column;
      gap: 24px;
    }
    .service-card {
      background: var(--pure-white);
      padding: 24px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: var(--transition-smooth);
      border-left: 4px solid var(--primary-green);
      display: flex;
      gap: 18px;
      align-items: flex-start;
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-left-color: var(--accent-orange);
    }
    .service-icon {
      font-size: 30px;
      color: var(--primary-green);
    }

    /* ----- 数据统计徽章墙 ----- */
    .stats-section {
      background: var(--deep-black);
      background-image: url('/assets/images/backpic/back-2.webp');
      background-blend-mode: overlay;
      background-size: cover;
      color: white;
      position: relative;
    }
    .stats-grid {
      display: flex;
      flex-wrap: wrap;
      justify-content: space-around;
      gap: 30px;
      text-align: center;
    }
    .stat-item {
      flex: 1 1 180px;
      background: rgba(255,255,255,0.08);
      backdrop-filter: blur(8px);
      padding: 30px 15px;
      border-radius: var(--radius-card);
      border: 1px solid rgba(255,255,255,0.12);
    }
    .stat-number {
      font-size: 42px;
      font-weight: 900;
      font-family: var(--font-data);
      color: var(--accent-orange);
    }

    /* ----- 特色功能卡片 ----- */
    .feature-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 28px;
    }
    .feature-card {
      background: var(--pure-white);
      border-radius: var(--radius-card);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition-smooth);
    }
    .feature-card:hover {
      transform: translateY(-2px);
      box-shadow: 0 16px 28px rgba(0,0,0,0.1);
      border: 1px solid var(--primary-green);
    }
    .feature-img {
      height: 140px;
      background-size: cover;
      border-radius: 12px;
      margin-bottom: 20px;
    }

    /* ----- FAQ 双列卡片 ----- */
    .faq-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
    }
    .faq-item {
      background: var(--pure-white);
      border-radius: var(--radius-card);
      padding: 20px 24px;
      box-shadow: var(--shadow-sm);
      cursor: pointer;
      border: 2px solid transparent;
      transition: var(--transition-smooth);
    }
    .faq-item.active {
      border-color: var(--primary-green);
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
      font-size: 1.1rem;
    }
    .faq-toggle {
      color: #aaa;
      font-weight: 700;
    }
    .faq-answer {
      margin-top: 12px;
      color: var(--text-light);
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    @media (max-width: 768px) {
      .faq-grid { grid-template-columns: 1fr; }
    }

    /* ----- CTA 终极号召 ----- */
    .cta-section {
      background: linear-gradient(135deg, #1a2e1f 0%, #162618 100%);
      color: white;
      text-align: center;
    }
    .footer {
      background: var(--deep-black);
      color: #aaa;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1fr;
      gap: 40px;
    }
    @media (max-width: 768px) {
      .footer-grid { grid-template-columns: 1fr; }
      .services-grid { flex-direction: column; }
    }