/* ═══════════════════════════════════════════════════════
   Transformer Cost Intelligence — Premium Dark Design
   Virginia Transformer Corp
═══════════════════════════════════════════════════════ */

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

:root {
  --bg:         #070c18;
  --bg2:        #0d1528;
  --bg3:        #111d35;
  --surface:    rgba(255,255,255,0.04);
  --surface2:   rgba(255,255,255,0.07);
  --border:     rgba(255,255,255,0.08);
  --border2:    rgba(255,255,255,0.14);

  --blue:       #4f8ef7;
  --blue-light: #7aaeff;
  --purple:     #a855f7;
  --teal:       #10b981;
  --amber:      #f59e0b;
  --red:        #ef4444;
  --pink:       #ec4899;
  --cyan:       #06b6d4;

  --text:       #e2e8f0;
  --text-dim:   #94a3b8;
  --text-muted: #475569;

  --font: 'Inter', system-ui, sans-serif;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 16px;

  /* Chart palette */
  --c1: #4f8ef7;
  --c2: #10b981;
  --c3: #a855f7;
  --c4: #f59e0b;
  --c5: #ef4444;
  --c6: #06b6d4;
  --c7: #ec4899;
  --c8: #84cc16;
}

html { font-size: 14px; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  min-height: 100vh;
  line-height: 1.5;
  background-image:
    radial-gradient(ellipse 80% 40% at 50% -10%, rgba(79,142,247,0.12) 0%, transparent 60%),
    radial-gradient(ellipse 60% 30% at 90% 100%, rgba(168,85,247,0.08) 0%, transparent 60%);
}

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg2); }
::-webkit-scrollbar-thumb { background: var(--border2); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.25); }

/* ═══════════════════════════════════════
   HEADER
═══════════════════════════════════════ */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 28px;
  background: rgba(7,12,24,0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-brand { display: flex; align-items: center; gap: 14px; }

.brand-icon {
  width: 44px; height: 44px;
  background: linear-gradient(135deg, rgba(79,142,247,0.2), rgba(168,85,247,0.2));
  border: 1px solid rgba(79,142,247,0.3);
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}

.brand-title {
  font-size: 1.15rem;
  font-weight: 700;
  background: linear-gradient(90deg, var(--blue-light), var(--purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}

.brand-sub {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 400;
  margin-top: 2px;
}

.header-meta { display: flex; gap: 8px; }

.meta-badge {
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  background: var(--surface2);
  border: 1px solid var(--border2);
  color: var(--text-dim);
}
.meta-badge.accent {
  background: rgba(79,142,247,0.12);
  border-color: rgba(79,142,247,0.3);
  color: var(--blue-light);
}

/* ═══════════════════════════════════════
   TAB NAV
═══════════════════════════════════════ */
.tab-nav {
  display: flex;
  gap: 4px;
  padding: 12px 28px;
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
}

.tab-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 18px;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-muted);
  font-family: var(--font);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}

.tab-btn:hover {
  background: var(--surface2);
  color: var(--text-dim);
  border-color: var(--border);
}

.tab-btn.active {
  background: linear-gradient(135deg, rgba(79,142,247,0.18), rgba(168,85,247,0.12));
  border-color: rgba(79,142,247,0.35);
  color: var(--blue-light);
  font-weight: 600;
}

/* ═══════════════════════════════════════
   SECTIONS
═══════════════════════════════════════ */
.tab-section { display: none; min-height: calc(100vh - 120px); }
.tab-section.active { display: block; }

.section-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 0;
  height: calc(100vh - 120px);
  overflow: hidden;
}

/* ═══════════════════════════════════════
   FILTER PANEL (Sidebar)
═══════════════════════════════════════ */
.filter-panel {
  background: var(--bg2);
  border-right: 1px solid var(--border);
  padding: 20px 16px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.panel-heading {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

.filter-group { display: flex; flex-direction: column; gap: 8px; }

.filter-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.filter-label .required { color: var(--red); }

.radio-group {
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  gap: 6px;
}
.radio-group.vertical { flex-direction: column; }

.radio-pill {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 7px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-dim);
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s;
  user-select: none;
}
.radio-pill:hover { border-color: var(--border2); color: var(--text); }
.radio-pill:has(input:checked) {
  border-color: rgba(79,142,247,0.5);
  background: rgba(79,142,247,0.12);
  color: var(--blue-light);
}
.radio-pill input { display: none; }
.pill-icon { font-size: 0.9rem; }

.checkbox-group { display: flex; flex-direction: column; gap: 5px; }
.check-pill {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 10px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-dim);
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s;
  user-select: none;
}
.check-pill:hover { border-color: var(--border2); color: var(--text); }
.check-pill:has(input:checked) {
  border-color: rgba(16,185,129,0.4);
  background: rgba(16,185,129,0.08);
  color: var(--teal);
}
.check-pill input { accent-color: var(--teal); }

.filter-select {
  appearance: none;
  background: var(--surface);
  border: 1px solid var(--border2);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: var(--font);
  font-size: 0.82rem;
  padding: 8px 32px 8px 10px;
  cursor: pointer;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%2394a3b8' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  transition: border-color 0.15s;
}
.filter-select:focus { outline: none; border-color: var(--blue); }
.filter-select option { background: #1e2a40; }

.btn-apply {
  margin-top: auto;
  padding: 10px;
  border-radius: var(--radius-sm);
  border: none;
  background: linear-gradient(135deg, var(--blue), var(--purple));
  color: #fff;
  font-family: var(--font);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  box-shadow: 0 4px 14px rgba(79,142,247,0.25);
}
.btn-apply:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(79,142,247,0.35);
}
.btn-apply:active { transform: translateY(0); }

/* ═══════════════════════════════════════
   TABLE AREA
═══════════════════════════════════════ */
.table-area {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  padding: 20px;
}

.table-header-bar {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 16px;
  flex-shrink: 0;
}

.section-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1.2;
}

.section-desc {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 3px;
}

.result-count {
  font-size: 0.75rem;
  color: var(--text-muted);
  background: var(--surface2);
  border: 1px solid var(--border);
  padding: 4px 10px;
  border-radius: 20px;
  white-space: nowrap;
}

.table-scroll-wrap {
  flex: 1;
  overflow: auto;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8rem;
}

.data-table thead { position: sticky; top: 0; z-index: 10; }

.data-table th {
  background: var(--bg3);
  color: var(--text-dim);
  font-weight: 600;
  text-transform: uppercase;
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  padding: 10px 14px;
  text-align: left;
  border-bottom: 1px solid var(--border2);
  white-space: nowrap;
}

.data-table th.num { text-align: right; }
.data-table td { padding: 9px 14px; border-bottom: 1px solid var(--border); vertical-align: middle; }
.data-table td.num { text-align: right; font-variant-numeric: tabular-nums; font-weight: 500; }
.data-table tbody tr { transition: background 0.1s; }
.data-table tbody tr:hover { background: var(--surface2); }
.data-table tbody tr:last-child td { border-bottom: none; }
.data-table.compact th, .data-table.compact td { padding: 7px 12px; }

/* Cell value states */
.cell-quote {
  font-size: 0.72rem;
  font-style: italic;
  color: var(--amber);
  background: rgba(245,158,11,0.1);
  padding: 2px 7px;
  border-radius: 4px;
}
.cell-na { color: var(--text-muted); }
.cell-price {
  font-weight: 600;
  color: var(--text);
}
.cell-price.high { color: var(--red); }
.cell-price.low  { color: var(--teal); }
.cell-price.mid  { color: var(--amber); }

.badge-source {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.7rem;
  font-weight: 600;
}
.badge-source.domestic {
  background: rgba(16,185,129,0.12);
  color: var(--teal);
  border: 1px solid rgba(16,185,129,0.25);
}
.badge-source.overseas {
  background: rgba(79,142,247,0.12);
  color: var(--blue-light);
  border: 1px solid rgba(79,142,247,0.25);
}
.badge-origin-us {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  padding: 1px 6px;
  border-radius: 3px;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  background: rgba(168,85,247,0.12);
  color: var(--purple);
  border: 1px solid rgba(168,85,247,0.25);
}
.badge-origin-nonus {
  display: inline-flex;
  padding: 1px 6px;
  border-radius: 3px;
  font-size: 0.65rem;
  font-weight: 600;
  background: var(--surface2);
  color: var(--text-muted);
  border: 1px solid var(--border);
}

/* ═══════════════════════════════════════
   CHART AREA (Integrated Cost)
═══════════════════════════════════════ */
.chart-area {
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  padding: 20px;
  gap: 20px;
}

.chart-header-bar {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-shrink: 0;
}

.tariff-badge {
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 700;
}
.tariff-badge.original {
  background: rgba(239,68,68,0.12);
  border: 1px solid rgba(239,68,68,0.3);
  color: var(--red);
}
.tariff-badge.reduced {
  background: rgba(16,185,129,0.12);
  border: 1px solid rgba(16,185,129,0.3);
  color: var(--teal);
}

/* ── KPI Cards ── */
.kpi-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px;
  flex-shrink: 0;
}

.kpi-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
  transition: border-color 0.2s, transform 0.2s;
  position: relative;
  overflow: hidden;
}
.kpi-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--kpi-color, var(--blue));
}
.kpi-card:hover { border-color: var(--border2); transform: translateY(-2px); }

.kpi-label {
  font-size: 0.68rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--text-muted);
  margin-bottom: 6px;
}
.kpi-value {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text);
  font-variant-numeric: tabular-nums;
}
.kpi-sub {
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-top: 2px;
}

.chart-container {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  position: relative;
  height: 360px;
}
.chart-container.tall { height: 430px; }

/* ── Toggle ── */
.toggle-wrap { display: flex; align-items: center; gap: 10px; }
.toggle-switch { position: relative; display: inline-block; width: 38px; height: 22px; flex-shrink: 0; }
.toggle-switch input { opacity: 0; width: 0; height: 0; }
.toggle-slider {
  position: absolute;
  inset: 0;
  background: var(--surface2);
  border: 1px solid var(--border2);
  border-radius: 22px;
  cursor: pointer;
  transition: all 0.2s;
}
.toggle-slider::before {
  content: '';
  position: absolute;
  height: 16px; width: 16px;
  left: 2px; top: 2px;
  background: var(--text-muted);
  border-radius: 50%;
  transition: all 0.2s;
}
.toggle-switch input:checked + .toggle-slider {
  background: rgba(79,142,247,0.2);
  border-color: rgba(79,142,247,0.5);
}
.toggle-switch input:checked + .toggle-slider::before {
  transform: translateX(16px);
  background: var(--blue);
}
.toggle-label { font-size: 0.8rem; font-weight: 500; color: var(--text-dim); }

/* ── Breakdown Table ── */
.breakdown-table-wrap { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.breakdown-title { font-size: 0.85rem; font-weight: 700; color: var(--text-dim); padding: 12px 16px; border-bottom: 1px solid var(--border); }
.pct-bar {
  display: inline-block;
  height: 6px;
  border-radius: 3px;
  vertical-align: middle;
  margin-right: 6px;
  background: var(--blue);
}

/* ═══════════════════════════════════════
   SCENARIO SECTION
═══════════════════════════════════════ */
#section-scenarios { padding: 20px 28px; overflow-y: auto; max-height: calc(100vh - 120px); }

.scenarios-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 20px;
  gap: 20px;
  flex-wrap: wrap;
}

.scenarios-controls {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

.filter-group.inline { flex-direction: row; align-items: center; gap: 10px; }
.filter-group.inline .filter-label { white-space: nowrap; }

.btn-add-scenario {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 9px 18px;
  border: 1px dashed rgba(79,142,247,0.5);
  border-radius: var(--radius-sm);
  background: rgba(79,142,247,0.06);
  color: var(--blue-light);
  font-family: var(--font);
  font-size: 0.83rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}
.btn-add-scenario:hover {
  background: rgba(79,142,247,0.12);
  border-color: rgba(79,142,247,0.7);
  transform: translateY(-1px);
}

/* ── Scenario Cards ── */
.scenarios-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 14px;
  margin-bottom: 28px;
}

.scenario-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color 0.2s, box-shadow 0.2s;
  position: relative;
}
.scenario-card:hover {
  border-color: var(--border2);
  box-shadow: 0 4px 20px rgba(0,0,0,0.3);
}
.scenario-card.active-card {
  border-color: rgba(79,142,247,0.4);
  box-shadow: 0 0 0 1px rgba(79,142,247,0.15);
}

.scenario-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
  background: var(--bg3);
}
.scenario-color-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}
.scenario-name-input {
  flex: 1;
  background: none;
  border: none;
  color: var(--text);
  font-family: var(--font);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0 8px;
  outline: none;
}
.scenario-name-input:focus { color: var(--blue-light); }

.btn-remove-scenario {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 1rem;
  line-height: 1;
  padding: 2px 4px;
  border-radius: 4px;
  transition: all 0.15s;
}
.btn-remove-scenario:hover { color: var(--red); background: rgba(239,68,68,0.1); }

.scenario-card-body { padding: 14px; display: flex; flex-direction: column; gap: 10px; }

.scn-field { display: flex; flex-direction: column; gap: 5px; }
.scn-field-label { font-size: 0.68rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em; color: var(--text-muted); }

.scn-radio-group { display: flex; gap: 5px; flex-wrap: wrap; }
.scn-radio-pill {
  padding: 5px 10px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-muted);
  font-family: var(--font);
  font-size: 0.75rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s;
}
.scn-radio-pill:hover { border-color: var(--border2); }
.scn-radio-pill.selected {
  border-color: rgba(79,142,247,0.5);
  background: rgba(79,142,247,0.12);
  color: var(--blue-light);
  font-weight: 600;
}

.scn-select {
  appearance: none;
  background: var(--surface);
  border: 1px solid var(--border2);
  border-radius: 6px;
  color: var(--text);
  font-family: var(--font);
  font-size: 0.78rem;
  padding: 6px 28px 6px 8px;
  cursor: pointer;
  width: 100%;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%2394a3b8' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 8px center;
}
.scn-select:focus { outline: none; border-color: var(--blue); }
.scn-select option { background: #1e2a40; }

/* ── Result badge on card ── */
.scenario-result-badge {
  margin: 0 14px 14px;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  background: var(--bg3);
  border: 1px solid var(--border2);
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.srb-label { font-size: 0.72rem; font-weight: 600; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.05em; }
.srb-value { font-size: 1.1rem; font-weight: 800; color: var(--text); font-variant-numeric: tabular-nums; }
.srb-tariff { font-size: 0.68rem; color: var(--text-muted); }

/* ── Scenarios chart wrap ── */
.scenarios-chart-wrap {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.scenario-legend {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.legend-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--text-dim);
}
.legend-dot { width: 10px; height: 10px; border-radius: 2px; flex-shrink: 0; }

/* ── Delta Table ── */
.delta-table-wrap {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.delta-table-title {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-dim);
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.delta-badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 5px;
  font-size: 0.72rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}
.delta-badge.neg { background: rgba(16,185,129,0.12); color: var(--teal); border: 1px solid rgba(16,185,129,0.25); }
.delta-badge.pos { background: rgba(239,68,68,0.12); color: var(--red); border: 1px solid rgba(239,68,68,0.25); }
.delta-badge.neu { background: var(--surface2); color: var(--text-muted); }

.scn-radio-pill.disabled-pill {
  opacity: 0.32;
  cursor: not-allowed;
  pointer-events: none;
  text-decoration: line-through;
}

/* ── No data state ── */
.no-data {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 200px;
  color: var(--text-muted);
  font-size: 0.85rem;
  gap: 8px;
}
.no-data-icon { font-size: 2rem; opacity: 0.4; }

/* ── Animations ── */
@keyframes fadeIn { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: translateY(0); } }
@keyframes slideIn { from { opacity: 0; transform: translateX(-8px); } to { opacity: 1; transform: translateX(0); } }

.tab-section.active { animation: fadeIn 0.25s ease; }
.scenario-card { animation: fadeIn 0.2s ease; }
.kpi-card { animation: fadeIn 0.3s ease; }

/* ── Responsive ── */
@media (max-width: 900px) {
  .section-layout { grid-template-columns: 1fr; height: auto; }
  .filter-panel { border-right: none; border-bottom: 1px solid var(--border); }
  .table-area, .chart-area { height: auto; overflow: visible; }
  .scenarios-cards { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
}