:root {
        --bg-color: #f5f7fa;
        --card-bg: #ffffff;
        --text-color: #333333;
        --text-muted: #666666;
        --primary: #4a9bff;
        --primary-dark: #2a6fc9;
        --secondary: #ff7043;
        --danger: #ff5252;
        --warning: #ffc107;
        --success: #4caf50;
        --border-color: #e0e0e0;
        --border-radius: 12px;
        --box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
        --hover-shadow: 0 8px 16px rgba(0, 0, 0, 0.12);
      }

      [data-theme="dark"] {
        --bg-color: #121212;
        --card-bg: #1e1e1e;
        --text-color: #f0f0f0;
        --text-muted: #aaaaaa;
        --border-color: #333333;
        --box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
        --hover-shadow: 0 8px 16px rgba(0, 0, 0, 0.4);
      }

      * {
        box-sizing: border-box;
        margin: 0;
        padding: 0;
        transition: background-color 0.3s, color 0.3s;
      }

      body {
        font-family: "Hind Siliguri", sans-serif;
        background-color: var(--bg-color);
        color: var(--text-color);
        line-height: 1.6;
        padding: 20px;
        min-height: 100vh;
      }

      .container {
        max-width: 1400px;
        margin: 0 auto;
        padding: 0 15px;
      }

      header {
        display: flex;
        justify-content: space-between;
        align-items: center;
        margin-bottom: 30px;
        padding-bottom: 20px;
        border-bottom: 1px solid var(--border-color);
      }

      .header-left {
        text-align: left;
      }

      .header-right {
        display: flex;
        gap: 15px;
        align-items: center;
      }

      h1 {
        color: var(--primary);
        margin-bottom: 5px;
        font-size: 2.2rem;
        font-weight: 700;
      }

      .subtitle {
        color: var(--text-muted);
        font-size: 1.1rem;
      }

      .app-container {
        display: flex;
        flex-direction: column;
        gap: 30px;
      }

      /* Card Styles */
      .card {
        background-color: var(--card-bg);
        border-radius: var(--border-radius);
        box-shadow: var(--box-shadow);
        padding: 20px;
        margin-bottom: 20px;
        transition: transform 0.3s, box-shadow 0.3s;
      }

      .card:hover {
        transform: translateY(-5px);
        box-shadow: var(--hover-shadow);
      }

      .card-header {
        display: flex;
        justify-content: space-between;
        align-items: center;
        margin-bottom: 15px;
        padding-bottom: 10px;
        border-bottom: 1px solid var(--border-color);
      }

      .card-title {
        font-size: 1.3rem;
        font-weight: 600;
        color: var(--primary);
      }

      /* Button Styles */
      .btn {
        padding: 10px 20px;
        border: none;
        border-radius: 8px;
        font-family: inherit;
        font-weight: 500;
        cursor: pointer;
        display: inline-flex;
        align-items: center;
        gap: 8px;
        transition: all 0.3s;
      }

      .btn-primary {
        background-color: var(--primary);
        color: white;
      }

      .btn-primary:hover {
        background-color: var(--primary-dark);
      }

      .btn-secondary {
        background-color: var(--card-bg);
        color: var(--primary);
        border: 1px solid var(--primary);
      }

      .btn-secondary:hover {
        background-color: rgba(74, 155, 255, 0.1);
      }

      .btn-icon {
        padding: 8px 12px;
        border-radius: 50%;
        min-width: 36px;
        min-height: 36px;
        display: flex;
        justify-content: center;
        align-items: center;
      }

      /* Form Styles */
      .form-group {
        margin-bottom: 15px;
      }

      label {
        display: block;
        margin-bottom: 5px;
        font-weight: 500;
        color: var(--text-color);
      }

      input,
      select,
      textarea {
        width: 100%;
        padding: 10px 15px;
        border: 1px solid var(--border-color);
        border-radius: 8px;
        background-color: var(--card-bg);
        color: var(--text-color);
        font-family: inherit;
      }

      input:focus,
      select:focus,
      textarea:focus {
        outline: none;
        border-color: var(--primary);
        box-shadow: 0 0 0 2px rgba(74, 155, 255, 0.2);
      }

      .form-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: 15px;
      }

      /* Results Grid */
      .results-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
        gap: 15px;
        margin: 20px 0;
      }

      .result-card {
        background-color: var(--card-bg);
        border-radius: var(--border-radius);
        padding: 15px;
        text-align: center;
        box-shadow: var(--box-shadow);
      }

      .result-card h4 {
        color: var(--text-muted);
        font-size: 0.9rem;
        margin-bottom: 5px;
      }

      .result-card p {
        font-size: 1.2rem;
        font-weight: 600;
        color: var(--primary);
      }

      /* Tabs */
      .feature-tabs {
        display: flex;
        gap: 10px;
        margin-bottom: 20px;
        flex-wrap: wrap;
      }

      .tab-btn {
        padding: 10px 20px;
        background-color: var(--card-bg);
        border: none;
        border-radius: 8px;
        color: var(--text-color);
        cursor: pointer;
        transition: all 0.3s;
        box-shadow: var(--box-shadow);
        font-weight: 500;
      }

      .tab-btn.active {
        background-color: var(--primary);
        color: white;
      }

      .tab-content {
        display: none;
      }

      .tab-content.active {
        display: block;
      }

      /* Dashboard Styles */
      .dashboard-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
        gap: 20px;
        margin-bottom: 30px;
      }

      .stat-card {
        display: flex;
        flex-direction: column;
        justify-content: space-between;
        height: 100%;
      }

      .stat-value {
        font-size: 2rem;
        font-weight: 700;
        margin: 10px 0;
      }

      .stat-change {
        display: flex;
        align-items: center;
        font-size: 0.9rem;
      }

      .stat-change.up {
        color: var(--success);
      }

      .stat-change.down {
        color: var(--danger);
      }

      /* Chart Containers */
      .chart-container {
        position: relative;
        height: 300px;
        margin: 20px 0;
      }

      /* Maintenance Log */
      .maintenance-log {
        max-height: 400px;
        overflow-y: auto;
        padding-right: 10px;
      }

      .log-entry {
        padding: 12px 15px;
        border-bottom: 1px solid var(--border-color);
        display: flex;
        justify-content: space-between;
        align-items: center;
      }

      .log-entry:last-child {
        border-bottom: none;
      }

      .log-type {
        display: inline-block;
        padding: 3px 8px;
        border-radius: 4px;
        font-size: 0.8rem;
        font-weight: 500;
      }

      .log-type.filter {
        background-color: rgba(74, 155, 255, 0.2);
        color: var(--primary);
      }

      .log-type.gas {
        background-color: rgba(255, 112, 67, 0.2);
        color: var(--secondary);
      }

      .log-type.service {
        background-color: rgba(76, 175, 80, 0.2);
        color: var(--success);
      }

      /* Review Cards */
      .review-card {
        background-color: var(--card-bg);
        border-radius: var(--border-radius);
        padding: 15px;
        margin-bottom: 15px;
        box-shadow: var(--box-shadow);
      }

      .review-header {
        display: flex;
        justify-content: space-between;
        margin-bottom: 10px;
      }

      .review-user {
        font-weight: 600;
      }

      .review-date {
        color: var(--text-muted);
        font-size: 0.9rem;
      }

      .review-rating {
        color: var(--warning);
      }

      /* Theme Toggle */
      .theme-toggle {
        position: relative;
        width: 50px;
        height: 24px;
        border-radius: 12px;
        background-color: var(--border-color);
        cursor: pointer;
        display: flex;
        align-items: center;
        padding: 0 5px;
        justify-content: space-between;
      }

      .theme-toggle i {
        font-size: 12px;
        color: var(--text-color);
      }

      .theme-toggle::before {
        content: "";
        position: absolute;
        width: 18px;
        height: 18px;
        border-radius: 50%;
        background-color: var(--primary);
        left: 3px;
        transition: transform 0.3s;
      }

      [data-theme="dark"] .theme-toggle::before {
        transform: translateX(26px);
      }

      /* Responsive adjustments */
      @media (max-width: 768px) {
        header {
          flex-direction: column;
          align-items: flex-start;
          gap: 15px;
        }

        .dashboard-grid {
          grid-template-columns: 1fr;
        }

        .feature-tabs {
          overflow-x: auto;
          padding-bottom: 10px;
          flex-wrap: nowrap;
        }
      }