:root {
      --bg: #f8fafc;
      --card: #ffffff;
      --text: #1f2937;
      --muted: #6b7280;
      --green-soft: #ecfdf3;
      --green-deep: #15803d;
      --purple-soft: #dcfce7;
      --purple-mist: #ecfdf3;
      --border: #d1d5db;
      --danger: #b91c1c;
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: "Avenir Next", "Montserrat", "Segoe UI", sans-serif;
      color: var(--text);
      background:
        radial-gradient(circle at 8% 15%, rgba(var(--accent-rgb), 0.08), transparent 28%),
        radial-gradient(circle at 92% 8%, rgba(15, 23, 42, 0.05), transparent 26%),
        var(--bg);
      min-height: 100vh;
      padding: 24px;
    }

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

    .page-shell {
      display: grid;
      gap: 18px;
    }

    h1 {
      margin: 0;
      font-size: 0.825rem;
      line-height: 1;
      color: var(--muted);
      text-align: right;
    }

    h2,
    h3 {
      margin: 0;
      color: var(--ink-deep);
    }

    .page-header {
      background: var(--card);
      border: 1px solid var(--border);
      border-radius: 22px;
      box-shadow: 0 18px 40px rgba(15, 23, 42, 0.08);
      padding: 20px;
      margin-bottom: 0;
    }

    .page-intro {
      margin-top: 12px;
      max-width: 760px;
      color: var(--muted);
      font-size: 1rem;
      line-height: 1.6;
    }

    .subtabs {
      display: flex;
      gap: 10px;
      margin: 0;
    }

    .subtab {
      padding: 10px 14px;
      border-radius: 10px;
      background: rgba(255, 255, 255, 0.86);
      border: 1px solid var(--border);
      color: var(--text);
      font-size: 0.95rem;
      font-weight: 700;
      line-height: 1.2;
    }

    .subtab.active {
      background: linear-gradient(135deg, var(--accent), var(--accent-deep));
      color: #fff;
    }

    .subtab:hover {
      background: var(--surface-tint-1);
    }

    .subtab.active:hover {
      background: linear-gradient(135deg, var(--accent-deep), var(--accent));
    }

    .page-stack {
      display: grid;
      gap: 18px;
    }

    .tab-panel {
      display: block;
    }

    .tab-panel[hidden] {
      display: none;
    }

    .section-card {
      border: 1px solid var(--border);
      border-radius: 18px;
      background: var(--card);
      box-shadow: 0 12px 24px rgba(15, 23, 42, 0.04);
      overflow: hidden;
    }

    .section-head {
      display: flex;
      justify-content: space-between;
      align-items: start;
      gap: 12px;
      padding: 18px 20px 14px;
      border-bottom: 1px solid var(--border);
      background: linear-gradient(180deg, #ffffff, var(--surface-tint-2));
    }

    .section-head p {
      margin-top: 6px;
      color: var(--muted);
      line-height: 1.5;
    }

    .section-body {
      padding: 18px 20px 20px;
    }

    p {
      margin: 0;
      color: var(--muted);
    }

    .formula-box {
      padding: 16px 18px;
      border-radius: 16px;
      border: 1px solid rgba(var(--accent-rgb), 0.14);
      background: linear-gradient(135deg, color-mix(in srgb, var(--accent-soft) 92%, white), rgba(255, 255, 255, 0.96));
      color: var(--text);
      font-size: 0.92rem;
      line-height: 1.6;
    }

    .toolbar {
      display: flex;
      justify-content: space-between;
      gap: 10px;
      align-items: end;
      flex-wrap: wrap;
    }

    .toolbar-split {
      margin-bottom: 14px;
    }

    .actions {
      display: flex;
      gap: 10px;
      flex-wrap: wrap;
    }

    .planning-tool {
      display: flex;
      flex-wrap: wrap;
      align-items: end;
      justify-content: space-between;
      gap: 12px 16px;
      width: 100%;
      padding: 14px 16px;
      border: 1px solid rgba(var(--accent-rgb), 0.14);
      border-radius: 16px;
      background: linear-gradient(135deg, color-mix(in srgb, var(--accent-soft) 92%, white), rgba(255, 255, 255, 0.96));
    }

    .planning-copy {
      display: grid;
      gap: 4px;
      max-width: 620px;
    }

    .planning-kicker {
      color: var(--accent-deep);
      font-size: 0.82rem;
      font-weight: 800;
      letter-spacing: 0.08em;
      text-transform: uppercase;
    }

    .planning-note {
      font-size: 0.92rem;
      line-height: 1.5;
    }

    .sim-controls {
      display: flex;
      gap: 10px;
      align-items: end;
      flex-wrap: wrap;
    }

    .control-group {
      min-width: 200px;
    }

    .control-group label {
      display: block;
      font-size: 0.85rem;
      color: var(--muted);
      margin-bottom: 4px;
    }

    select {
      width: 100%;
      padding: 8px 10px;
      border: 1px solid var(--border);
      border-radius: 8px;
      font-size: 0.95rem;
      background: #fff;
    }

    button {
      border: none;
      border-radius: 10px;
      padding: 10px 14px;
      font-size: 0.95rem;
      font-weight: 700;
      cursor: pointer;
      transition: transform 0.1s ease, opacity 0.2s ease, background 0.2s ease;
    }

    button:hover {
      transform: translateY(-1px);
    }

    .add-btn,
    .clear-btn,
    .sample-btn,
    .report-btn {
      background: linear-gradient(135deg, var(--accent), var(--accent-deep));
      color: #fff;
      border: none;
    }

    .add-btn:hover,
    .clear-btn:hover,
    .sample-btn:hover,
    .report-btn:hover {
      background: linear-gradient(135deg, var(--accent-deep), var(--accent));
    }

    .simulate-btn {
      background: linear-gradient(135deg, var(--accent), var(--accent-deep));
      color: #fff;
    }

    .simulate-btn:hover {
      background: linear-gradient(135deg, var(--accent-deep), var(--accent));
    }

    .table-wrap {
      margin-top: 0;
      overflow-x: auto;
      border: 1px solid var(--border);
      border-radius: 16px;
    }

    table {
      width: 100%;
      border-collapse: collapse;
      min-width: 1080px;
    }

    th,
    td {
      padding: 12px;
      border-bottom: 1px solid var(--border);
      text-align: left;
      vertical-align: middle;
    }

    th {
      background: linear-gradient(180deg, var(--bg), var(--surface-tint-3));
      color: var(--ink-deep);
      font-size: 0.9rem;
      text-align: center;
    }

    .th-process {
      text-align: left;
    }

    tr:last-child td {
      border-bottom: none;
    }

    input[type="text"],
    input[type="number"] {
      width: 100%;
      padding: 8px 10px;
      border: 1px solid var(--border);
      border-radius: 8px;
      font-size: 0.95rem;
    }

    input[type="text"] {
      text-align: left;
    }

    input[type="number"] {
      text-align: center;
    }

    .cases-input,
    .steps-input {
      text-align: center;
    }

    .value-control {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 12px;
      width: 100%;
    }

    .value-control .table-value-input {
      flex: 1 1 auto;
      width: auto;
      min-width: 0;
    }

    .table-wrap td .table-value-input {
      text-align: center !important;
    }

    .toggle-wrap {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      flex: 0 0 82px;
      width: 82px;
      height: auto;
      min-height: 44px;
      font-size: 0.84rem;
      line-height: 1.2;
      color: var(--muted);
      user-select: none;
      text-align: center;
    }

    .toggle-wrap input[type="checkbox"] {
      margin: 0;
      width: auto;
      height: auto;
      accent-color: var(--accent-2);
    }

    .toggle-label {
      display: inline-block;
      font-size: 0.84rem;
      line-height: 1.2;
      font-weight: 700;
      text-align: center;
      white-space: normal;
      margin-top: 0;
    }

    .table-mode-toggle {
      justify-content: flex-start;
      text-align: left;
    }

    .calc-box {
      display: flex;
      align-items: center;
      justify-content: center;
      width: 100%;
      min-height: 38px;
      padding: 0;
      border: none;
      background: transparent;
      font-weight: 700;
      white-space: nowrap;
      text-align: center;
    }

    .remove-btn {
      width: 30px;
      height: 30px;
      padding: 0;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border-radius: 0;
      background: transparent;
      color: var(--danger);
      font-size: 1rem;
      font-weight: 700;
      line-height: 1;
    }

    .detail-grid {
      margin-top: 16px;
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: 14px;
    }

    .process-detail-grid {
      grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .metric-card {
      min-width: 0;
      padding: 18px;
      border: 1px solid rgba(var(--accent-rgb), 0.18);
      border-radius: 12px;
      background: linear-gradient(135deg, color-mix(in srgb, var(--accent-soft) 90%, white), rgba(248, 250, 252, 1));
      text-align: center;
    }

    .metric-label {
      margin: 0 0 8px;
      color: var(--muted);
      font-size: 0.86rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.04em;
      text-align: center;
    }

    .metric-value {
      margin: 0;
      font-size: 2rem;
      font-weight: 800;
      line-height: 1;
      color: var(--ink-deep);
      text-align: center;
    }

    .sim-status {
      width: 100%;
      margin-top: 0;
      margin-bottom: 12px;
      font-size: 0.9rem;
      color: var(--accent-deep);
    }

    .sim-status.error {
      color: var(--danger);
    }

    .totals-charts-grid {
      display: grid;
      grid-template-columns: 1fr;
      gap: 14px;
      margin-top: 18px;
    }

    .totals-chart-card {
      padding: 16px 18px;
      background: linear-gradient(180deg, #ffffff, color-mix(in srgb, var(--accent-soft) 24%, white));
      border: 1px solid var(--border);
      border-radius: 18px;
    }

    .chart-title {
      margin: 0 0 12px;
      font-size: 1rem;
      font-weight: 700;
      color: var(--ink-deep);
    }

    .chart-wrap {
      position: relative;
      height: 260px;
    }

    .simulator-section-body {
      padding: 0;
    }

    .simulator-frame {
      width: 100%;
      height: 640px;
      min-height: 0;
      border: 0;
      display: block;
      background: transparent;
    }

    @media (max-width: 640px) {
      body {
        padding: 14px;
      }

      .page-header,
      .section-head,
      .section-body {
        padding-left: 14px;
        padding-right: 14px;
      }

      .subtabs {
        flex-wrap: wrap;
      }

      .totals-charts-grid {
        grid-template-columns: 1fr;
      }

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

      .process-detail-grid {
        grid-template-columns: 1fr;
      }

      .actions,
      .sim-controls {
        width: 100%;
      }

      .planning-tool {
        padding: 14px;
      }

      .actions button,
      .sim-controls button,
      .sim-controls .control-group {
        flex: 1 1 180px;
      }

      .simulator-section-body {
        padding: 0;
      }

      .simulator-frame {
        height: 640px;
        min-height: 0;
      }
    }