/* roulang page: index */
:root {
      --primary-deep: #0F3D3E;
      --primary-dark: #1E1E24;
      --accent-energy: #FF6B35;
      --accent-green: #00C49A;
      --bg-warm: #F5F3EE;
      --card-white: #FFFFFF;
      --text-deep: #2D2D2D;
      --text-mid: #6B6B6B;
      --text-light: #9CA3AF;
      --border-light: #E5E7EB;
      --radius-card: 16px;
      --radius-btn: 8px;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.06);
      --shadow-hover: 0 8px 30px rgba(0,0,0,0.12);
      --transition-smooth: 0.25s ease;
      --font-heading: 'Inter', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
    }

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

    body {
      font-family: var(--font-body);
      background-color: var(--bg-warm);
      color: var(--text-deep);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    h1, h2, h3, h4 {
      font-family: var(--font-heading);
      font-weight: 700;
      letter-spacing: -0.02em;
    }

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

    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(12px);
      box-shadow: 0 1px 8px rgba(0,0,0,0.02);
      z-index: 100;
      padding: 16px 0;
      transition: background 0.3s;
    }

    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
    }

    .logo {
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--primary-deep);
      text-decoration: none;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo span {
      color: var(--accent-energy);
    }

    .nav-links {
      display: flex;
      gap: 28px;
      align-items: center;
    }

    .nav-links a {
      text-decoration: none;
      color: var(--text-deep);
      font-weight: 500;
      font-size: 1rem;
      transition: color 0.2s;
      padding: 4px 0;
      border-bottom: 2px solid transparent;
    }

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

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 6px;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
    }
    .hamburger span {
      width: 26px;
      height: 3px;
      background: var(--text-deep);
      border-radius: 4px;
      transition: 0.3s;
    }

    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: 70px;
        left: 0;
        width: 100%;
        background: rgba(255,255,255,0.96);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 32px 24px;
        gap: 24px;
        display: none;
        box-shadow: 0 20px 30px rgba(0,0,0,0.05);
      }
      .nav-links.active {
        display: flex;
      }
      .hamburger {
        display: flex;
      }
    }

    /* 按钮系统 */
    .btn-primary {
      background: var(--accent-energy);
      color: white;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      display: inline-block;
      border: none;
      cursor: pointer;
      transition: background 0.2s, transform 0.2s;
      font-size: 1rem;
      letter-spacing: 0.3px;
    }
    .btn-primary:hover {
      background: #E55A2B;
      transform: scale(1.02);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--accent-energy);
      color: var(--accent-energy);
      padding: 10px 26px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      transition: 0.25s;
    }
    .btn-outline:hover {
      background: var(--accent-energy);
      color: white;
    }

    /* Hero */
    .hero {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 85vh;
      display: flex;
      align-items: center;
      position: relative;
      margin-top: 70px;
      color: white;
    }
    .hero-overlay {
      background: linear-gradient(90deg, rgba(15,61,62,0.82) 0%, rgba(30,30,36,0.5) 100%);
      position: absolute;
      inset: 0;
      width: 100%;
      height: 100%;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 700px;
      padding: 24px;
    }
    .hero h1 {
      font-size: 3.2rem;
      line-height: 1.2;
      margin-bottom: 20px;
      color: white;
      text-shadow: 0 2px 6px rgba(0,0,0,0.3);
    }
    .hero p {
      font-size: 1.25rem;
      color: rgba(255,255,255,0.9);
      margin-bottom: 32px;
    }

    @media (max-width: 768px) {
      .hero h1 { font-size: 2.2rem; }
    }

    /* 数据看板 */
    .dashboard {
      background: var(--primary-deep);
      padding: 72px 0;
    }
    .stats-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 24px;
      justify-content: center;
    }
    .stat-card {
      background: rgba(255,255,255,0.08);
      backdrop-filter: blur(8px);
      border-radius: var(--radius-card);
      padding: 28px 32px;
      min-width: 160px;
      flex: 1 1 180px;
      text-align: center;
      color: white;
    }
    .stat-number {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--accent-energy);
      line-height: 1.2;
    }
    .stat-label {
      font-size: 0.95rem;
      color: #ddd;
      margin-top: 8px;
    }

    /* 服务矩阵 非对称网格 */
    .services {
      padding: 80px 0;
      background: var(--bg-warm);
    }
    .services h2 {
      text-align: center;
      margin-bottom: 48px;
      font-size: 2.2rem;
    }
    .service-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr;
      gap: 24px;
    }
    .service-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-card);
      transition: var(--transition-smooth);
      display: flex;
      flex-direction: column;
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .service-card.large {
      background: linear-gradient(135deg, #0F3D3E 0%, #1E3A3B 100%);
      color: white;
      grid-row: span 2;
    }
    .service-card img {
      width: 56px;
      height: 56px;
      border-radius: 16px;
      object-fit: cover;
      margin-bottom: 20px;
    }
    .service-card h3 {
      font-size: 1.4rem;
      margin-bottom: 12px;
    }
    .service-card p {
      color: var(--text-mid);
      font-size: 0.95rem;
      line-height: 1.6;
    }
    .service-card.large p {
      color: rgba(255,255,255,0.85);
    }

    @media (max-width: 1024px) {
      .service-grid {
        grid-template-columns: 1fr 1fr;
      }
      .service-card.large {
        grid-column: span 2;
      }
    }
    @media (max-width: 768px) {
      .service-grid {
        grid-template-columns: 1fr;
      }
      .service-card.large {
        grid-column: span 1;
      }
    }

    /* 对比模块 */
    .comparison {
      padding: 80px 0;
      background: white;
    }
    .comparison h2 {
      text-align: center;
      margin-bottom: 40px;
      font-size: 2rem;
    }
    .compare-panels {
      display: flex;
      gap: 24px;
      align-items: center;
      justify-content: center;
      flex-wrap: wrap;
    }
    .panel {
      flex: 1 1 280px;
      padding: 36px 28px;
      border-radius: 24px;
      background: #f9fafb;
      color: #4b5563;
    }
    .panel.highlight {
      background: var(--primary-deep);
      color: white;
      box-shadow: 0 20px 35px rgba(15,61,62,0.3);
    }
    .panel h3 {
      font-size: 1.5rem;
      margin-bottom: 16px;
    }
    .vs-divider {
      font-weight: 800;
      font-size: 2rem;
      color: var(--accent-energy);
    }

    /* FAQ */
    .faq {
      padding: 80px 0;
      background: var(--bg-warm);
    }
    .faq h2 {
      text-align: center;
      margin-bottom: 48px;
    }
    .accordion {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid #ddd;
      margin-bottom: 8px;
    }
    .faq-question {
      width: 100%;
      background: none;
      border: none;
      padding: 20px 16px;
      font-size: 1.1rem;
      font-weight: 600;
      text-align: left;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      color: var(--text-deep);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      background: #f3f4f6;
      border-radius: 10px;
      margin: 0 12px;
    }
    .faq-answer p {
      padding: 18px 24px;
      color: var(--text-mid);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
    }

    /* CTA */
    .cta {
      background: var(--accent-energy);
      padding: 70px 0;
      color: white;
    }
    .cta-inner {
      max-width: 600px;
      margin: 0 auto;
      text-align: center;
    }
    .cta-form input, .cta-form textarea {
      width: 100%;
      padding: 14px;
      margin: 10px 0;
      border-radius: 8px;
      border: 1px solid transparent;
      background: white;
      font-family: inherit;
    }
    .cta-form input:focus, .cta-form textarea:focus {
      border-color: var(--primary-deep);
      outline: none;
    }
    .footer {
      background: #1E1E24;
      color: #aaa;
      padding: 40px 0;
      text-align: center;
    }
    .footer a {
      color: #ccc;
      text-decoration: none;
      margin: 0 10px;
    }
    .footer a:hover {
      color: var(--accent-energy);
    }