/* roulang page: index */
:root {
      --primary-green: #1B3A2D;
      --energy-orange: #F15A24;
      --deep-orange: #D9481A;
      --warm-lime: #FAF7F2;
      --white: #FFFFFF;
      --green-light-bg: rgba(27, 58, 45, 0.05);
      --border-light: rgba(27, 58, 45, 0.15);
      --shadow-sm: 0 4px 20px rgba(27, 58, 45, 0.06);
      --shadow-hover: 0 12px 32px rgba(27, 58, 45, 0.12);
      --radius-card: 20px;
      --radius-btn: 12px;
      --radius-badge: 8px;
      --transition: 0.25s ease;
      --font-sans: 'Noto Sans SC', system-ui, -apple-system, 'Segoe UI', sans-serif;
      --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--warm-lime);
      color: #1B3A2D;
      line-height: 1.5;
      font-weight: 400;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

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

    button, input, textarea {
      font-family: inherit;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }

    /* 导航 */
    .main-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      z-index: 50;
      box-shadow: 0 2px 12px rgba(27, 58, 45, 0.04);
      transition: background 0.3s;
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--primary-green);
      letter-spacing: 0.5px;
    }

    .logo-icon {
      font-size: 1.8rem;
      line-height: 1;
    }

    .nav-links {
      display: flex;
      gap: 2.5rem;
      font-weight: 500;
      color: #1B3A2D;
      font-size: 1rem;
    }

    .nav-links a {
      padding: 8px 0;
      border-bottom: 2px solid transparent;
      transition: border-color 0.2s;
    }

    .nav-links a:hover {
      border-bottom-color: var(--energy-orange);
    }

    .mobile-nav {
      display: none;
      position: fixed;
      bottom: 16px;
      left: 50%;
      transform: translateX(-50%);
      background: white;
      border-radius: 24px;
      box-shadow: 0 8px 30px rgba(27, 58, 45, 0.12);
      padding: 8px 24px;
      backdrop-filter: blur(20px);
      z-index: 55;
      width: fit-content;
      gap: 20px;
      justify-content: center;
      align-items: center;
    }

    .mobile-nav a {
      display: flex;
      flex-direction: column;
      align-items: center;
      font-size: 11px;
      font-weight: 500;
      color: #5A6E65;
      gap: 2px;
      padding: 6px 6px;
      transition: color 0.2s;
    }

    .mobile-nav a.active {
      color: var(--primary-green);
      font-weight: 700;
    }

    /* 板块间距 */
    section {
      padding: 100px 0;
    }

    .section-title {
      font-size: 2.5rem;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--primary-green);
      letter-spacing: -0.3px;
    }

    .section-sub {
      font-size: 1rem;
      color: rgba(27, 58, 45, 0.7);
      margin-bottom: 48px;
      max-width: 600px;
    }

    /* 按钮 */
    .btn-primary {
      background: var(--energy-orange);
      color: white;
      border: none;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 1rem;
      cursor: pointer;
      transition: background 0.2s, box-shadow 0.2s;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 12px rgba(241, 90, 36, 0.2);
    }

    .btn-primary:hover {
      background: var(--deep-orange);
      box-shadow: 0 6px 18px rgba(241, 90, 36, 0.3);
    }

    .btn-outline {
      background: transparent;
      border: 1px solid var(--primary-green);
      color: var(--primary-green);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      cursor: pointer;
      transition: background 0.2s;
    }

    .btn-outline:hover {
      background: rgba(27, 58, 45, 0.08);
    }

    /* Hero */
    #hero {
      padding-top: 140px;
      display: flex;
      align-items: center;
      gap: 60px;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      background-blend-mode: overlay;
      background-color: rgba(250, 247, 242, 0.7);
    }

    .hero-left {
      flex: 1;
    }

    .hero-left h1 {
      font-size: 3.2rem;
      font-weight: 700;
      line-height: 1.3;
      color: var(--primary-green);
      margin-bottom: 20px;
    }

    .hero-desc {
      font-size: 1.1rem;
      color: rgba(27, 58, 45, 0.75);
      margin-bottom: 32px;
    }

    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .hero-right {
      flex: 1;
      position: relative;
      display: flex;
      justify-content: center;
      align-items: center;
    }

    .hero-visual {
      background: rgba(255,255,255,0.7);
      backdrop-filter: blur(8px);
      border-radius: 32px;
      padding: 30px;
      display: flex;
      gap: 20px;
      box-shadow: var(--shadow-hover);
      border: 1px solid rgba(27,58,45,0.1);
    }

    .badge-item {
      background: white;
      border-radius: 16px;
      padding: 16px 20px;
      text-align: center;
      box-shadow: var(--shadow-sm);
      font-weight: 600;
      color: var(--primary-green);
    }

    .badge-item .number {
      font-family: var(--font-mono);
      font-size: 1.8rem;
      color: var(--energy-orange);
    }

    /* 指标看板 */
    #metrics {
      background: linear-gradient(135deg, #1B3A2D 0%, #0F281F 100%);
      color: white;
      text-align: center;
    }

    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
      margin-top: 20px;
    }

    .metric-card {
      background: rgba(255,255,255,0.08);
      border-radius: 24px;
      padding: 28px 16px;
      backdrop-filter: blur(4px);
    }

    .metric-number {
      font-size: 2.8rem;
      font-weight: 700;
      font-family: var(--font-mono);
      color: var(--energy-orange);
    }

    .metric-label {
      color: rgba(255,255,255,0.8);
      margin-top: 8px;
    }

    /* 服务矩阵 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .service-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      transition: transform var(--transition), box-shadow var(--transition), border var(--transition);
      border: 1px solid transparent;
      display: flex;
      flex-direction: column;
    }

    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(27,58,45,0.15);
    }

    .service-icon {
      background: rgba(27,58,45,0.08);
      width: 56px;
      height: 56px;
      border-radius: 16px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 24px;
      margin-bottom: 20px;
    }

    .service-card h3 {
      font-size: 1.5rem;
      font-weight: 700;
      margin-bottom: 12px;
    }

    .service-cover {
      width: 100%;
      height: 180px;
      object-fit: cover;
      border-radius: 12px;
      margin: 16px 0;
    }

    .btn-card {
      margin-top: auto;
      align-self: flex-start;
      color: var(--primary-green);
      font-weight: 600;
      border-bottom: 2px solid transparent;
      padding: 4px 0;
    }

    /* 对比 */
    .comparison-container {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }

    .compare-card {
      background: white;
      border-radius: 24px;
      padding: 32px;
      box-shadow: var(--shadow-sm);
    }

    .compare-card.left {
      background: #f0f2f1;
    }

    .compare-card.right {
      background: #f2f7f4;
      border: 1px solid rgba(27,58,45,0.2);
    }

    .compare-item {
      display: flex;
      align-items: center;
      gap: 16px;
      margin: 20px 0;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }

    details {
      background: white;
      border-radius: 16px;
      margin-bottom: 12px;
      padding: 20px 24px;
      box-shadow: var(--shadow-sm);
      transition: background 0.2s;
    }

    details[open] {
      background: #faf7f2;
    }

    summary {
      font-weight: 600;
      font-size: 1.1rem;
      cursor: pointer;
      list-style: none;
      display: flex;
      align-items: center;
      gap: 12px;
    }

    summary::before {
      content: "●";
      color: var(--energy-orange);
      font-size: 0.9rem;
    }

    /* 表单 */
    .cta-block {
      background: rgba(27,58,45,0.04);
      border-radius: 32px;
      padding: 60px;
      text-align: center;
    }

    .form-grid {
      display: flex;
      flex-direction: column;
      gap: 20px;
      max-width: 560px;
      margin: 32px auto 0;
    }

    input, textarea {
      padding: 16px;
      border: 1px solid rgba(27,58,45,0.2);
      border-radius: 12px;
      font-size: 1rem;
      background: white;
    }

    .footer {
      background: #0F281F;
      color: #e0e8e4;
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 40px;
    }

    @media (max-width: 1024px) {
      .services-grid { grid-template-columns: repeat(2,1fr); }
    }

    @media (max-width: 768px) {
      .container { padding: 0 20px; }
      .nav-links { display: none; }
      .mobile-nav { display: flex; }
      #hero { flex-direction: column; padding-top: 100px; }
      .hero-left h1 { font-size: 2.4rem; }
      .metrics-grid { grid-template-columns: repeat(2,1fr); }
      .services-grid { grid-template-columns: 1fr; }
      .comparison-container { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      section { padding: 70px 0; }
    }