/* roulang page: index */
/* ----- 设计变量 ----- */
    :root {
      --primary-deep: #0F1A14;
      --secondary-mist: #2C4736;
      --accent-neon: #A3E635;
      --accent-hover: #BEF264;
      --warning-amber: #F59E0B;
      --text-main: #E6E8E4;
      --text-secondary: #C5C9C2;
      --text-muted: #9CA3AF;
      --bg-card: rgba(44, 71, 54, 0.7);
      --bg-dark-input: #1C1C1C;
      
      --radius-card: 12px;
      --radius-btn: 8px;
      --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.25);
      --shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.4);
      --transition: 0.3s ease;
      
      --max-width: 1280px;
      --section-gap: 120px;
      --mobile-gap: 80px;
    }

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

    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: var(--primary-deep);
      color: var(--text-secondary);
      line-height: 1.75;
      font-size: 1rem;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* ----- 数字字体 ----- */
    .stat-number, .data-value, .count-up {
      font-family: "DIN Alternate", "SF Mono", "Courier New", monospace;
      font-weight: 700;
      color: var(--accent-neon);
    }

    /* ----- 图片基础 ----- */
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

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

    /* ----- 导航栏 ----- */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      backdrop-filter: blur(12px);
      background-color: transparent;
      transition: background-color 0.4s ease, backdrop-filter 0.4s ease;
      padding: 16px 0;
    }
    .site-header.scrolled {
      background-color: rgba(15, 26, 20, 0.95);
      backdrop-filter: blur(12px);
      box-shadow: 0 2px 12px rgba(0,0,0,0.2);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--text-main);
      letter-spacing: -0.5px;
    }
    .logo-icon {
      width: 32px;
      height: 32px;
      background: var(--accent-neon);
      border-radius: 6px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #0F1A14;
      font-weight: 700;
      font-size: 1.2rem;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      color: var(--text-secondary);
      font-weight: 500;
      font-size: 0.95rem;
      transition: color var(--transition);
      position: relative;
    }
    .nav-links a:hover {
      color: var(--accent-neon);
    }
    /* 移动端底部导航 */
    .mobile-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background: #0F1A14;
      border-top: 1px solid rgba(163,230,53,0.2);
      backdrop-filter: blur(20px);
      justify-content: space-around;
      padding: 10px 16px;
      z-index: 1000;
    }
    .mobile-nav a {
      display: flex;
      flex-direction: column;
      align-items: center;
      color: var(--text-muted);
      font-size: 0.7rem;
      gap: 4px;
    }
    .mobile-nav a span {
      font-size: 1.2rem;
      line-height: 1;
    }
    .mobile-nav a.active-mobile {
      color: var(--accent-neon);
    }

    /* ----- 板块通用 ----- */
    section {
      padding: var(--section-gap) 0;
    }
    h1, h2, h3 {
      color: var(--text-main);
    }
    h1 {
      font-size: clamp(2.5rem, 6vw, 4.5rem);
      font-weight: 700;
      letter-spacing: -0.02em;
      line-height: 1.2;
    }
    h2 {
      font-size: clamp(1.8rem, 4vw, 2.5rem);
      font-weight: 600;
      margin-bottom: 16px;
      letter-spacing: -0.01em;
    }
    h3 {
      font-size: 1.25rem;
      font-weight: 600;
      margin-bottom: 8px;
    }

    /* ----- Hero ----- */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      background-repeat: no-repeat;
    }
    .hero-overlay {
      position: absolute;
      inset: 0;
      background: rgba(15, 26, 20, 0.65);
      backdrop-filter: blur(1px);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 700px;
    }
    .hero h1 {
      margin-bottom: 20px;
    }
    .hero-subtitle {
      font-size: 1.25rem;
      color: #C5C9C2;
      margin-bottom: 32px;
      line-height: 1.6;
    }
    .btn-primary {
      background: var(--accent-neon);
      color: #0F1A14;
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      border: none;
      cursor: pointer;
      display: inline-block;
      transition: all 0.25s ease;
      font-size: 1rem;
      text-align: center;
    }
    .btn-primary:hover {
      background: var(--accent-hover);
      transform: translateY(-2px);
      box-shadow: 0 8px 18px rgba(163,230,53,0.3);
      color: #0F1A14;
    }

    /* ----- 指标看板 ----- */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      margin-top: 40px;
    }
    .stat-card {
      background: rgba(44, 71, 54, 0.7);
      backdrop-filter: blur(8px);
      border-radius: var(--radius-card);
      padding: 24px 20px;
      transition: all var(--transition);
    }
    .stat-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
      background: rgba(44, 71, 54, 0.85);
    }
    .stat-label {
      color: #C5C9C2;
      font-size: 0.9rem;
      margin-bottom: 12px;
      font-weight: 500;
    }
    .stat-value {
      font-size: clamp(2rem, 5vw, 3.5rem);
      display: flex;
      align-items: baseline;
      gap: 8px;
    }
    .trend-up { color: var(--accent-neon); font-size: 1.2rem; }
    .trend-down { color: var(--warning-amber); font-size: 1.2rem; }

    /* ----- 服务卡片网格 ----- */
    .service-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 24px;
      margin-top: 40px;
    }
    .service-card {
      background: var(--secondary-mist);
      border-radius: var(--radius-card);
      padding: 28px 24px;
      transition: all var(--transition);
      box-shadow: var(--shadow-card);
    }
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .service-icon {
      width: 48px;
      height: 48px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--accent-neon);
      margin-bottom: 20px;
      transition: transform 0.3s ease;
    }
    .service-card:hover .service-icon {
      transform: scale(1.08);
    }
    .service-link {
      color: var(--text-secondary);
      font-weight: 500;
      display: inline-flex;
      align-items: center;
      gap: 4px;
      margin-top: 16px;
      transition: color 0.2s;
    }
    .service-card:hover .service-link {
      color: var(--accent-neon);
    }

    /* ----- 对比面板 ----- */
    .compare-wrapper {
      background: rgba(44, 71, 54, 0.4);
      border-radius: 20px;
      padding: 40px;
      display: flex;
      flex-wrap: wrap;
      gap: 40px;
      margin-top: 40px;
      backdrop-filter: blur(10px);
    }
    .compare-col {
      flex: 1 1 260px;
    }
    .compare-col h3 {
      margin-bottom: 16px;
      font-size: 1.2rem;
    }
    .compare-item {
      display: flex;
      justify-content: space-between;
      padding: 14px 0;
      border-bottom: 1px solid rgba(255,255,255,0.08);
      font-size: 0.95rem;
    }
    .bar-chart {
      margin-top: 30px;
      width: 100%;
    }
    .bar-row {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 16px;
    }
    .bar-label {
      width: 70px;
      font-size: 0.8rem;
      color: #C5C9C2;
    }
    .bar-bg {
      flex: 1;
      height: 18px;
      background: rgba(0,0,0,0.3);
      border-radius: 20px;
      overflow: hidden;
    }
    .bar-fill {
      height: 100%;
      width: 0%;
      border-radius: 20px;
      transition: width 0.9s ease;
    }

    /* ----- FAQ ----- */
    .faq-list {
      margin-top: 30px;
    }
    .faq-item {
      margin-bottom: 16px;
      border-radius: var(--radius-card);
      overflow: hidden;
      background: #2C4736;
    }
    .faq-question {
      width: 100%;
      background: transparent;
      border: none;
      color: var(--text-main);
      padding: 20px;
      font-size: 1.1rem;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      text-align: left;
    }
    .faq-icon {
      color: var(--accent-neon);
      font-size: 1.5rem;
      transition: transform 0.3s;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      background: rgba(44,71,54,0.5);
      color: #C5C9C2;
      padding: 0 20px;
    }
    .faq-answer p {
      padding: 6px 0 18px;
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
    }
    .faq-item.open .faq-icon {
      transform: rotate(45deg);
    }

    /* ----- 表单 ----- */
    .cta-section {
      text-align: center;
      background: rgba(44,71,54,0.3);
      border-radius: 24px;
      padding: 60px 24px;
    }
    .contact-form {
      display: flex;
      flex-direction: column;
      align-items: center;
      margin-top: 28px;
    }
    .input-email {
      background: #1C1C1C;
      border: 1px solid #2C4736;
      color: #E6E8E4;
      border-radius: var(--radius-btn);
      padding: 14px 18px;
      width: 100%;
      max-width: 420px;
      font-size: 1rem;
      outline: none;
      transition: border 0.2s;
      margin-bottom: 16px;
    }
    .input-email:focus {
      border-color: var(--accent-neon);
      box-shadow: 0 0 0 3px rgba(163,230,53,0.25);
    }
    .privacy-note {
      color: #9CA3AF;
      font-size: 0.75rem;
      margin-top: 16px;
    }

    /* 页脚 */
    .site-footer {
      border-top: 1px solid rgba(230,232,228,0.1);
      padding: 28px 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
    }
    .footer-links a {
      color: #9CA3AF;
      margin-left: 24px;
      font-size: 0.9rem;
    }
    .footer-links a:hover {
      color: var(--accent-neon);
    }

    /* ----- 响应式 ----- */
    @media (max-width: 1024px) {
      .stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 768px) {
      .desktop-nav { display: none; }
      .mobile-nav { display: flex; }
      .site-header { padding: 12px 0; }
      h1 { font-size: 2.5rem; }
      .stats-grid {
        grid-template-columns: 1fr;
      }
      .compare-wrapper {
        flex-direction: column;
        padding: 24px;
      }
      .service-grid {
        grid-template-columns: 1fr;
      }
      .btn-primary {
        width: 100%;
        padding: 14px 24px;
      }
      section {
        padding: var(--mobile-gap) 0;
      }
      .footer-links a {
        margin-left: 12px;
      }
      .hero {
        min-height: 90vh;
      }
    }
    @media (max-width: 480px) {
      .container {
        padding: 0 16px;
      }
      .hero-content {
        text-align: left;
      }
      .stat-value {
        font-size: 2rem;
      }
      .input-email {
        max-width: 100%;
      }
    }