@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@300;400;500;600;700;800&display=swap');

      :root {
        /* Default Dark Theme - Refined */
        --primary: #0a192f;
        --accent: #64ffda;
        --accent-glow: rgba(100, 255, 218, 0.3);
        --text: #ccd6f6;
        --text-muted: #8892b0;
        --bg: #050a14;
        --surface: #0d1b30;
        --surface-hover: #1b2b45;
        --glass: rgba(13, 27, 48, 0.7);
        --glass-border: rgba(100, 255, 218, 0.1);
        --danger: #ff4d4d;
        --success: #64ffda;
        --warning: #ffb86c;
      }

      [data-theme="light"] {
        --primary: #f8fafc;
        --accent: #0f172a;
        --accent-glow: rgba(15, 23, 42, 0.1);
        --text: #1e293b;
        --text-muted: #64748b;
        --bg: #f1f5f9;
        --surface: #ffffff;
        --surface-hover: #e2e8f0;
        --glass: rgba(255, 255, 255, 0.8);
        --glass-border: rgba(15, 23, 42, 0.05);
        --danger: #dc2626;
        --success: #16a34a;
        --warning: #d97706;
      }

      /* Custom Nice Scrollbar */
      ::-webkit-scrollbar { width: 8px; height: 8px; }
      ::-webkit-scrollbar-track { background: var(--bg); }
      ::-webkit-scrollbar-thumb {
        background: var(--surface-hover);
        border-radius: 10px;
        border: 2px solid var(--bg);
      }
      ::-webkit-scrollbar-thumb:hover { background: var(--accent); }

      * {
        box-sizing: border-box;
        transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease, transform 0.2s ease;
      }

      body {
        font-family: 'Montserrat', sans-serif;
        background-color: var(--bg);
        color: var(--text);
        margin: 0;
        padding: 40px 20px;
        line-height: 1.6;
        background-image: 
          radial-gradient(circle at 20% 20%, rgba(100, 255, 218, 0.03) 0%, transparent 40%),
          radial-gradient(circle at 80% 80%, rgba(0, 210, 255, 0.03) 0%, transparent 40%);
      }

      .header {
        text-align: center;
        padding-bottom: 40px;
        margin-bottom: 40px;
        position: relative;
        max-width: 1400px;
        margin-left: auto;
        margin-right: auto;
      }

      .controls {
        position: absolute;
        top: -10px;
        right: 0;
        display: flex;
        gap: 12px;
      }

      .control-btn {
        background: var(--surface);
        border: 1px solid var(--glass-border);
        color: var(--text);
        padding: 8px 16px;
        border-radius: 12px;
        cursor: pointer;
        font-size: 0.85rem;
        font-weight: 600;
        font-family: inherit;
        backdrop-filter: blur(10px);
        box-shadow: 0 4px 12px rgba(0,0,0,0.1);
      }

      .control-btn:hover {
        background: var(--surface-hover);
        border-color: var(--accent);
        transform: translateY(-2px);
      }

      .header h1 {
        margin: 0 0 15px 0;
        color: var(--text);
        font-size: 2.2rem;
        font-weight: 800;
        letter-spacing: -0.02em;
      }
      .header p {
        margin: 0;
        color: var(--text-muted);
        font-size: 1.1rem;
        font-weight: 400;
      }

      .container {
        display: grid;
        grid-template-columns: 420px 1fr;
        gap: 40px;
        max-width: 1500px;
        margin: 0 auto;
      }

      /* --- Sidebar & Panels --- */
      .panel {
        background: var(--glass);
        padding: 25px;
        border-radius: 20px;
        border: 1px solid var(--glass-border);
        backdrop-filter: blur(10px);
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
        margin-bottom: 30px;
      }

      .panel h2 {
        margin-top: 0;
        color: var(--accent);
        font-size: 1.3rem;
        font-weight: 700;
        letter-spacing: 0.05em;
        text-transform: uppercase;
        border-bottom: 1px solid var(--glass-border);
        padding-bottom: 15px;
        margin-bottom: 20px;
      }

      .form-group {
        margin-bottom: 15px;
      }

      .form-group label {
        display: block;
        font-size: 0.85rem;
        color: var(--text-muted);
        margin-bottom: 5px;
      }

      .input-row {
        display: flex;
        align-items: center;
        gap: 10px;
      }

      input[type="number"],
      input[type="text"] {
        width: 100%;
        padding: 12px;
        background: var(--bg);
        border: 1px solid var(--glass-border);
        color: var(--text);
        border-radius: 10px;
        font-family: inherit;
        font-weight: 500;
      }

      input:focus {
        outline: none;
        border-color: var(--accent);
        box-shadow: 0 0 0 4px var(--accent-glow);
      }
      input[readonly] {
        background-color: transparent;
        color: var(--text-muted);
        border-color: transparent;
        cursor: default;
      }

      /* --- Dynamic Line Items --- */
      .line-item {
        display: grid;
        grid-template-columns: 30px 1fr 100px 30px;
        gap: 10px;
        align-items: center;
        margin-bottom: 10px;
        background: var(--surface);
        padding: 8px;
        border-radius: 4px;
      }

      .line-item.completed {
        opacity: 0.5;
      }
      .line-item.completed input {
        text-decoration: line-through;
      }

      .btn-icon {
        background: none;
        border: none;
        color: var(--danger);
        cursor: pointer;
        font-size: 1.2rem;
        padding: 0;
      }
      .btn-icon:hover {
        color: #ff7878;
      }

      .btn-add {
        background: rgba(100, 255, 218, 0.1);
        color: var(--accent);
        border: 1px dashed var(--accent);
        padding: 5px 10px;
        border-radius: 4px;
        cursor: pointer;
        font-size: 0.8rem;
        width: 100%;
        margin-top: 10px;
      }
      .btn-add:hover {
        background: rgba(100, 255, 218, 0.2);
      }

      /* --- Phase Toggle --- */
      .phase-status {
        display: flex;
        align-items: center;
        gap: 10px;
        margin-bottom: 15px;
        padding: 10px;
        background: var(--surface);
        border-radius: 4px;
        font-size: 0.9rem;
      }
      .phase-status input[type="checkbox"] {
        width: 18px;
        height: 18px;
        cursor: pointer;
      }

      /* --- Main Dashboard --- */
      .summary-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
        gap: 15px;
        margin-bottom: 20px;
      }

      .summary-card {
        background: var(--glass);
        padding: 25px;
        border-radius: 20px;
        border: 1px solid var(--glass-border);
        border-left: 6px solid var(--accent);
        backdrop-filter: blur(10px);
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
        transition: transform 0.3s ease;
      }
      .summary-card:hover {
        transform: translateY(-5px);
      }

      .summary-value {
        font-size: 1.8rem;
        font-weight: 800;
        color: var(--text);
        margin: 5px 0;
      }
      .summary-label {
        font-size: 0.75rem;
        font-weight: 700;
        color: var(--accent);
        text-transform: uppercase;
        letter-spacing: 0.1em;
      }

      /* --- Tabs for Phases --- */
      .tabs {
        display: flex;
        gap: 5px;
        margin-bottom: 15px;
        flex-wrap: wrap;
      }
      .tab-btn {
        background: var(--bg);
        color: var(--text-muted);
        border: 1px solid var(--glass-border);
        padding: 10px 18px;
        cursor: pointer;
        border-radius: 12px;
        font-weight: 600;
        font-size: 0.8rem;
      }
      .tab-btn.active {
        background: var(--accent);
        color: var(--bg);
        border-color: var(--accent);
        box-shadow: 0 4px 15px var(--accent-glow);
      }
      .tab-content {
        display: none;
      }
      .tab-content.active {
        display: block;
      }

      /* --- Chart & Table --- */
      .chart-container {
        height: 400px;
        margin-bottom: 40px;
        background: var(--glass);
        padding: 25px;
        border-radius: 20px;
        border: 1px solid var(--glass-border);
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
      }

      .table-controls {
        display: flex;
        justify-content: space-between;
        align-items: center;
        margin-bottom: 15px;
      }

      .btn-export {
        background: var(--accent);
        color: white;
        border: none;
        padding: 8px 15px;
        border-radius: 4px;
        font-weight: bold;
        cursor: pointer;
      }
      [data-theme="light"] .btn-export {
        color: white;
      }
      .btn-export:hover {
        opacity: 0.9;
      }

      table {
        width: 100%;
        border-collapse: collapse;
        font-size: 0.9rem;
      }
      th,
      td {
        padding: 10px;
        text-align: right;
        border-bottom: 1px solid var(--surface-hover);
      }
      th {
        background: var(--surface);
        color: var(--text-muted);
      }
      th:first-child,
      td:first-child {
        text-align: left;
      }
      tr.positive td {
        color: var(--success);
      }
      tr.negative td {
        color: var(--danger);
      }

      .status-banner {
        padding: 20px;
        border-radius: 15px;
        margin-bottom: 30px;
        font-weight: 700;
        text-align: center;
        backdrop-filter: blur(10px);
        font-size: 1.1rem;
      }
      .status-success {
        background-color: rgba(100, 255, 218, 0.1);
        color: var(--success);
        border: 1px solid var(--success);
        box-shadow: 0 0 20px rgba(100, 255, 218, 0.1);
      }
      .status-danger {
        background-color: rgba(255, 77, 77, 0.1);
        color: var(--danger);
        border: 1px solid var(--danger);
        box-shadow: 0 0 20px rgba(255, 77, 77, 0.1);
      }