:root {
  --bg: #0f1420;
  --bg-elev: #161d2e;
  --bg-elev-2: #1e2740;
  --border: #2a3452;
  --text: #e8ecf7;
  --text-dim: #93a0c2;
  --accent: #5ea1ff;
  --accent-2: #10a37f;
  --good: #4ade80;
  --warn: #fbbf24;
  --bad: #f87171;
  --radius: 12px;
}

body.light {
  --bg: #f4f6fb;
  --bg-elev: #ffffff;
  --bg-elev-2: #eef1f8;
  --border: #d8dee9;
  --text: #171b26;
  --text-dim: #5b6478;
  --accent: #2563eb;
  --accent-2: #0f9d78;
  --good: #16a34a;
  --warn: #b45309;
  --bad: #dc2626;
}

body { transition: background-color .15s ease, color .15s ease; }

.theme-toggle {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  color: var(--text);
  width: 38px;
  height: 38px;
  border-radius: 10px;
  cursor: pointer;
  font-size: 16px;
  line-height: 1;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Inter, Arial, sans-serif;
  font-size: 14px;
}

#app { max-width: 1200px; margin: 0 auto; padding: 0 20px 60px; }

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: 24px;
  position: sticky;
  top: 0;
  background: var(--bg);
  z-index: 10;
}

.brand { display: flex; align-items: center; gap: 8px; font-weight: 700; font-size: 18px; }
.brand-mark {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #0b0f1a;
  padding: 4px 8px;
  border-radius: 8px;
  font-size: 13px;
}

.tabs { display: flex; gap: 6px; background: var(--bg-elev); padding: 4px; border-radius: 10px; }
.tab-btn {
  background: transparent;
  border: none;
  color: var(--text-dim);
  padding: 8px 18px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
}
.tab-btn.active { background: var(--accent); color: #0b0f1a; }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

.panel { margin-bottom: 28px; }
.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
  flex-wrap: wrap;
  gap: 10px;
}
.panel-header h2 { margin: 0; font-size: 16px; color: var(--text); }

.period-toggle { display: flex; gap: 4px; background: var(--bg-elev); padding: 3px; border-radius: 8px; }
.period-toggle button {
  background: transparent; border: none; color: var(--text-dim);
  padding: 6px 12px; border-radius: 6px; cursor: pointer; font-size: 12px; font-weight: 600;
}
.period-toggle button.active { background: var(--bg-elev-2); color: var(--accent-2); }

.grid { display: grid; gap: 16px; margin-bottom: 16px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: 1.1fr 1fr; }
@media (max-width: 900px) {
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
}

.card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
}
.card h3 { margin: 0 0 10px; font-size: 13px; color: var(--text-dim); text-transform: uppercase; letter-spacing: .04em; }

.stat-row { display: flex; justify-content: space-between; padding: 6px 0; border-bottom: 1px dashed var(--border); font-size: 13px; }
.stat-row:last-child { border-bottom: none; }
.stat-row .label { color: var(--text-dim); }
.stat-row .value { font-weight: 600; }
.stat-hero { font-size: 26px; font-weight: 700; margin-bottom: 4px; }
.stat-sub { color: var(--text-dim); font-size: 12px; margin-bottom: 12px; }

.stat-hero.good { color: var(--good); }
.stat-hero.warn { color: var(--warn); }
.stat-hero.bad { color: var(--bad); }

.nhs-banner {
  padding: 12px 16px;
  border-radius: var(--radius);
  margin-bottom: 20px;
  font-weight: 600;
  font-size: 13px;
  border: 1px solid transparent;
}
.nhs-banner.ok { background: rgba(74,222,128,.12); border-color: rgba(74,222,128,.3); color: var(--good); }
.nhs-banner.over { background: rgba(248,113,113,.12); border-color: rgba(248,113,113,.3); color: var(--bad); }
.hidden { display: none !important; }

.proj-table, .editable-table { width: 100%; border-collapse: collapse; font-size: 12.5px; }
.proj-table th, .proj-table td, .editable-table th, .editable-table td {
  padding: 8px 6px; text-align: right; border-bottom: 1px solid var(--border);
}
.proj-table th:first-child, .proj-table td:first-child,
.editable-table th:first-child, .editable-table td:first-child { text-align: left; }
.proj-table th { color: var(--text-dim); font-weight: 600; }

.sliders-card { margin-bottom: 16px; }
.slider-row { margin-bottom: 16px; }
.slider-row label { display: flex; justify-content: space-between; margin-bottom: 6px; font-size: 13px; color: var(--text-dim); }
.slider-row label span { color: var(--accent-2); font-weight: 700; }
.slider-with-input { display: flex; align-items: center; gap: 8px; }
.slider-with-input input[type=range] {
  flex: 1 1 auto;
  accent-color: var(--accent);
  height: 22px;
  -webkit-appearance: none;
  appearance: none;
  background: transparent;
  cursor: pointer;
}
.slider-with-input input[type=range]::-webkit-slider-runnable-track {
  height: 6px; border-radius: 3px; background: var(--bg-elev-2);
}
.slider-with-input input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none;
  width: 18px; height: 18px; margin-top: -6px;
  border-radius: 50%; background: var(--accent);
  border: 2px solid var(--bg-elev); cursor: pointer;
}
.slider-with-input input[type=range]::-moz-range-track {
  height: 6px; border-radius: 3px; background: var(--bg-elev-2);
}
.slider-with-input input[type=range]::-moz-range-thumb {
  width: 16px; height: 16px; border-radius: 50%;
  background: var(--accent); border: 2px solid var(--bg-elev); cursor: pointer;
}
.slider-with-input .input-prefix, .slider-with-input .input-suffix {
  color: var(--text-dim); font-size: 12px; white-space: nowrap;
}
.slider-with-input input[type=number] {
  width: 90px;
  background: var(--bg-elev-2);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 6px 8px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
}
.slider-actions { display: flex; align-items: center; gap: 12px; margin-top: 4px; }

.btn { border: none; border-radius: 8px; padding: 9px 16px; font-size: 13px; font-weight: 600; cursor: pointer; }
.btn-primary { background: var(--accent); color: #0b0f1a; }
.btn-secondary { background: var(--bg-elev-2); color: var(--text); border: 1px solid var(--border); }
.btn-danger { background: transparent; color: var(--bad); border: 1px solid rgba(248,113,113,.4); padding: 4px 10px; font-size: 12px; }
.save-confirm { color: var(--good); font-size: 12px; font-weight: 600; }

.form-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 14px; }
.form-field { display: flex; flex-direction: column; gap: 6px; }
.form-field label { font-size: 12px; color: var(--text-dim); }
.form-field input[type=text], .form-field input[type=number], .form-field input[type=date], .form-field select {
  background: var(--bg-elev-2); border: 1px solid var(--border); color: var(--text);
  padding: 8px 10px; border-radius: 8px; font-size: 13px;
}
.form-field.checkbox { flex-direction: row; align-items: center; gap: 8px; }

.editable-table input, .editable-table select {
  background: var(--bg-elev-2); border: 1px solid var(--border); color: var(--text);
  padding: 6px 8px; border-radius: 6px; font-size: 12.5px; width: 100%;
}
.editable-table td:first-child input { text-align: left; }

.hint { color: var(--text-dim); font-size: 12px; margin: 0 0 12px; }

.chart-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 12px;
}
.chart-card-header h3 { margin: 0; }

.horizon-toggle {
  display: flex; gap: 3px; background: var(--bg-elev-2); padding: 3px; border-radius: 8px; flex-wrap: wrap;
}
.horizon-toggle button {
  background: transparent; border: none; color: var(--text-dim);
  padding: 5px 9px; border-radius: 6px; cursor: pointer; font-size: 11px; font-weight: 600;
}
.horizon-toggle button.active { background: var(--accent); color: #0b0f1a; }

.slider-row-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 6px; }
.slider-row-header label { font-size: 13px; color: var(--text-dim); }

.mini-toggle { display: flex; gap: 3px; background: var(--bg-elev-2); padding: 3px; border-radius: 8px; }
.mini-toggle button {
  background: transparent; border: none; color: var(--text-dim);
  padding: 4px 10px; border-radius: 6px; cursor: pointer; font-size: 11px; font-weight: 700;
}
.mini-toggle button.active { background: var(--accent-2); color: #0b0f1a; }

.master-chart-card { margin-top: 4px; }
.series-toggles { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 14px; }
.series-toggle {
  display: flex; align-items: center; gap: 6px;
  background: var(--bg-elev-2); border: 1px solid var(--border);
  padding: 6px 12px; border-radius: 20px; font-size: 12px; font-weight: 600;
  cursor: pointer; user-select: none; color: var(--text-dim);
}
.series-toggle .dot { width: 9px; height: 9px; border-radius: 50%; }
.series-toggle.active { color: var(--text); border-color: var(--accent); }
.series-toggle input { display: none; }

.dependant-stop-info { font-size: 11px; color: var(--text-dim); }

/* ================= Mobile ================= */
@media (max-width: 640px) {
  #app { padding: 0 12px 40px; }

  .topbar {
    flex-wrap: wrap;
    gap: 10px;
    padding: 14px 0;
  }
  .brand { font-size: 16px; }
  .tabs { order: 3; width: 100%; }
  .tab-btn { flex: 1; padding: 8px 10px; font-size: 13px; }
  .theme-toggle { margin-left: auto; }

  .panel-header { flex-direction: column; align-items: flex-start; }
  .panel-header .period-toggle,
  .panel-header .btn { width: 100%; justify-content: center; }
  .period-toggle { width: 100%; justify-content: space-between; }
  .period-toggle button { flex: 1; }

  .card { padding: 14px; }
  .stat-hero { font-size: 22px; }

  .slider-with-input { flex-wrap: wrap; }
  .slider-with-input input[type=range] { flex: 1 1 100%; order: 1; }
  .slider-with-input .input-prefix { order: 2; }
  .slider-with-input input[type=number] { order: 3; flex: 1 1 auto; }
  .slider-with-input .input-suffix { order: 4; }

  .slider-actions { flex-direction: column; align-items: stretch; }
  .slider-actions .btn { width: 100%; }

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

  /* Tables scroll horizontally rather than squashing */
  .card:has(.proj-table), .card:has(.editable-table) {
    overflow-x: auto;
  }
  .proj-table, .editable-table { min-width: 480px; }

  .chart-card-header { flex-direction: column; align-items: flex-start; }
  .horizon-toggle { width: 100%; overflow-x: auto; flex-wrap: nowrap; }
  .horizon-toggle button { flex: 0 0 auto; }
  .slider-row-header { flex-direction: column; align-items: flex-start; gap: 6px; }
}