/* ===== CSS Variables (Light Theme) ===== */
:root {
  --bg: #f0f2f5;
  --bg-card: #ffffff;
  --bg-header: #1a2332;
  --text: #1a1a2e;
  --text-secondary: #5a6170;
  --text-muted: #9ca3af;
  --border: #e2e5ea;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --danger: #ef4444;
  --success: #22c55e;
  --warning: #f59e0b;
  --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-lg: 0 4px 16px rgba(0,0,0,0.1);
  --radius: 10px;
  --radius-sm: 6px;
  --clr-heating: #ef4444;
  --clr-cooling: #3b82f6;
  --clr-lighting: #eab308;
  --clr-equipment: #6b7280;
  --clr-fans: #ec4899;
  --clr-pumps: #8b5cf6;
  --clr-heat-recovery: #f97316;
}
[data-theme="dark"] {
  --bg: #0f172a; --bg-card: #1e293b; --bg-header: #0b1120;
  --text: #e2e8f0; --text-secondary: #94a3b8; --text-muted: #64748b;
  --border: #334155;
  --shadow: 0 1px 3px rgba(0,0,0,0.3); --shadow-lg: 0 4px 16px rgba(0,0,0,0.4);
}

/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif;
  background: var(--bg); color: var(--text); line-height: 1.6; min-height: 100vh;
}

/* ===== Header ===== */
.header {
  background: var(--bg-header); color: #fff; padding: 0 24px; height: 56px;
  display: flex; align-items: center; justify-content: space-between;
  position: sticky; top: 0; z-index: 100;
}
.header-left { display: flex; align-items: center; gap: 10px; }
.header-right { display: flex; align-items: center; gap: 8px; }
.logo { font-size: 18px; font-weight: 700; }
.badge { font-size: 10px; font-weight: 600; background: var(--accent); color: #fff; padding: 2px 8px; border-radius: 99px; }

/* ===== Buttons ===== */
.btn {
  display: inline-flex; align-items: center; gap: 6px; padding: 8px 16px;
  border: none; border-radius: var(--radius-sm); font-size: 13px; font-weight: 500; cursor: pointer; transition: all 0.15s;
}
.btn-ghost { background: transparent; color: #cbd5e1; }
.btn-ghost:hover { background: rgba(255,255,255,0.1); }
.btn-icon { background: transparent; color: #cbd5e1; font-size: 18px; padding: 6px 10px; }
.btn-icon:hover { background: rgba(255,255,255,0.1); }
.btn-outline { background: transparent; color: var(--accent); border: 1px solid var(--accent); }
.btn-outline:hover { background: var(--accent); color: #fff; }
.btn-danger { color: var(--danger); }
.btn-danger:hover { background: rgba(239,68,68,0.1); }
.btn-close { background: none; border: none; color: var(--text-muted); font-size: 18px; cursor: pointer; padding: 2px 6px; border-radius: 4px; }
.btn-close:hover { background: rgba(239,68,68,0.1); color: var(--danger); }

/* ===== Upload ===== */
.upload-section { max-width: 720px; margin: 40px auto; padding: 0 20px; }
.upload-area {
  border: 2px dashed var(--border); border-radius: var(--radius); padding: 60px 40px;
  text-align: center; cursor: pointer; transition: all 0.2s; background: var(--bg-card);
}
.upload-area:hover, .upload-area.dragover { border-color: var(--accent); background: rgba(59,130,246,0.04); }
.upload-icon { font-size: 48px; margin-bottom: 16px; }
.upload-area h2 { font-size: 20px; margin-bottom: 8px; }
.upload-area p { color: var(--text-secondary); font-size: 14px; }
.upload-hint { margin-top: 8px; font-size: 12px !important; color: var(--text-muted) !important; }

/* ===== Report Cards ===== */
.report-cards { max-width: 1280px; margin: 0 auto; padding: 20px 24px; }
.section-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 16px; flex-wrap: wrap; gap: 12px; }
.section-header h2 { font-size: 18px; display: flex; align-items: center; gap: 8px; }
.count-badge { display: inline-flex; align-items: center; justify-content: center; background: var(--accent); color: #fff; font-size: 12px; font-weight: 600; width: 24px; height: 24px; border-radius: 99px; }
.cards-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 12px; }
.report-card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 16px; box-shadow: var(--shadow); position: relative; transition: box-shadow 0.2s;
}
.report-card:hover { box-shadow: var(--shadow-lg); }
.report-card .card-color { width: 4px; height: 100%; position: absolute; left: 0; top: 0; border-radius: var(--radius) 0 0 var(--radius); }
.report-card .card-body { padding-left: 8px; }
.report-card .card-title { font-size: 14px; font-weight: 600; margin-bottom: 6px; word-break: break-all; }
.report-card .card-meta { font-size: 12px; color: var(--text-secondary); display: flex; flex-direction: column; gap: 2px; }
.report-card .card-actions { position: absolute; top: 10px; right: 10px; }

/* ===== Tabs ===== */
.tab-nav { max-width: 1280px; margin: 0 auto; padding: 0 24px; display: flex; gap: 4px; border-bottom: 1px solid var(--border); overflow-x: auto; }
.tab {
  padding: 12px 20px; background: none; border: none; font-size: 14px; font-weight: 500;
  color: var(--text-secondary); cursor: pointer; border-bottom: 2px solid transparent; transition: all 0.15s; white-space: nowrap;
}
.tab:hover { color: var(--text); }
.tab.active { color: var(--accent); border-bottom-color: var(--accent); }
.tab-content { max-width: 1280px; margin: 0 auto; padding: 24px; }

/* ===== Tab Toolbar ===== */
.tab-toolbar { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px; margin-bottom: 20px; }
.report-selector { display: flex; align-items: center; gap: 8px; }
.report-selector label { font-size: 13px; font-weight: 500; color: var(--text-secondary); }
.report-selector select { padding: 7px 12px; border: 1px solid var(--border); border-radius: var(--radius-sm); background: var(--bg-card); color: var(--text); font-size: 13px; min-width: 220px; }

/* ===== Cooling / Heating Toggle ===== */
.toggle-group {
  display: inline-flex; background: var(--bg); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden;
}
.toggle-btn {
  padding: 8px 20px; border: none; background: transparent; font-size: 13px; font-weight: 600;
  cursor: pointer; color: var(--text-secondary); transition: all 0.2s; display: flex; align-items: center; gap: 6px;
}
.toggle-btn .toggle-icon { font-size: 16px; }
.toggle-btn.active[data-mode="cooling"] { background: var(--clr-cooling); color: #fff; }
.toggle-btn.active[data-mode="heating"] { background: var(--clr-heating); color: #fff; }
.toggle-btn.active[data-unit="ip"], .toggle-btn.active[data-unit="si"] { background: var(--accent); color: #fff; }
.toggle-btn:not(.active):hover { background: rgba(0,0,0,0.05); }
[data-theme="dark"] .toggle-btn:not(.active):hover { background: rgba(255,255,255,0.05); }
.toggle-unit, .toggle-lang { margin-right: 8px; }
.toggle-unit .toggle-btn, .toggle-lang .toggle-btn { padding: 5px 12px; font-size: 12px; font-weight: 700; }
.toggle-lang .toggle-btn.active { background: #22c55e; color: #fff; }

/* ===== Charts ===== */
.charts-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(400px, 1fr)); gap: 16px; margin-bottom: 16px; }
.chart-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow); }
.chart-card.full-width { grid-column: 1 / -1; }
.chart-card h3 { font-size: 14px; font-weight: 600; margin-bottom: 16px; }
.chart-wrapper { position: relative; height: 300px; }
.chart-wide { height: 380px; }

/* ===== Summary Cards ===== */
.summary-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 12px; margin-bottom: 20px; }
.summary-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 14px 16px; box-shadow: var(--shadow); }
.summary-card .label { font-size: 11px; color: var(--text-secondary); text-transform: uppercase; letter-spacing: 0.3px; margin-bottom: 4px; }
.summary-card .value { font-size: 22px; font-weight: 700; }
.summary-card .unit { font-size: 11px; color: var(--text-muted); margin-left: 3px; }
.summary-card.highlight { border-left: 3px solid var(--accent); }
.summary-card.warn { border-left: 3px solid var(--warning); }

/* ===== Data Tables ===== */
.table-section { margin-bottom: 28px; }
.table-section h3 { font-size: 15px; font-weight: 600; margin-bottom: 10px; }
.table-scroll { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); }
.data-table { width: 100%; border-collapse: collapse; font-size: 13px; background: var(--bg-card); }
.data-table th { background: var(--bg-header); color: #e2e8f0; padding: 10px 12px; text-align: right; font-weight: 600; white-space: nowrap; position: sticky; top: 0; font-size: 12px; }
.data-table th:first-child { text-align: left; }
.data-table td { padding: 9px 12px; border-bottom: 1px solid var(--border); text-align: right; white-space: nowrap; }
.data-table td:first-child { text-align: left; font-weight: 500; }
.data-table tr:hover { background: rgba(59,130,246,0.04); }
.data-table tbody tr:last-child { font-weight: 700; background: rgba(59,130,246,0.03); }

/* Cell highlights */
.cell-high { background: rgba(239,68,68,0.12) !important; color: #dc2626; font-weight: 700; }
.cell-mid { background: rgba(59,130,246,0.08) !important; color: var(--accent); font-weight: 600; }
.cell-low { color: var(--text-secondary); }
.cell-zero { color: var(--text-muted); opacity: 0.4; }
.cell-negative { color: var(--clr-cooling); }
.cell-positive { color: var(--clr-heating); }
.cell-bar { display: inline-block; height: 3px; border-radius: 2px; margin-top: 2px; }
.cell-bar-cool { background: var(--clr-cooling); }
.cell-bar-heat { background: var(--clr-heating); }

/* Compare delta cells */
.cell-better { background: rgba(34,197,94,0.08) !important; color: #16a34a; font-weight: 600; }
.cell-worse { background: rgba(239,68,68,0.08) !important; color: #dc2626; font-weight: 600; }

/* ===== Highlight Legend ===== */
.highlight-legend { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 14px 18px; margin-top: 8px; }
.highlight-legend h4 { font-size: 12px; margin-bottom: 8px; color: var(--text-secondary); }
.legend-items { display: flex; flex-wrap: wrap; gap: 14px; }
.legend-item { display: flex; align-items: center; gap: 5px; font-size: 11px; color: var(--text-secondary); }
.dot { width: 9px; height: 9px; border-radius: 50%; }
.dot-high { background: var(--clr-heating); }
.dot-mid { background: var(--accent); }
.dot-low { background: var(--text-secondary); }
.dot-zero { background: var(--text-muted); opacity: 0.4; }

/* Table inline legend */
.table-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  padding: 10px 14px;
  margin-top: 6px;
  font-size: 11px;
  color: var(--text-secondary);
  border-top: 1px solid var(--border);
}

/* ===== Compare ===== */
.compare-header { margin-bottom: 20px; }
.compare-header h2 { font-size: 18px; }
.compare-hint { font-size: 13px; color: var(--text-muted); margin-top: 4px; }

/* ===== Toast ===== */
.toast {
  position: fixed; bottom: 24px; right: 24px; background: var(--bg-header); color: #fff;
  padding: 12px 20px; border-radius: var(--radius-sm); font-size: 14px; box-shadow: var(--shadow-lg);
  opacity: 0; transform: translateY(10px); transition: all 0.3s; z-index: 200; pointer-events: none;
}
.toast.show { opacity: 1; transform: translateY(0); }
.toast.error { background: var(--danger); }
.toast.success { background: var(--success); }

/* ===== Sticky first column ===== */
.data-table td:first-child, .data-table th:first-child {
  position: sticky; left: 0; z-index: 2; background: var(--bg-card);
}
.data-table th:first-child { background: var(--bg-header); z-index: 3; }
.data-table tr:hover td:first-child { background: rgba(59,130,246,0.06); }
[data-theme="dark"] .data-table td:first-child { background: var(--bg-card); }

/* ===== Empty state ===== */
.empty-state { text-align: center; padding: 40px 20px; color: var(--text-secondary); }
.empty-state .empty-icon { font-size: 40px; margin-bottom: 12px; opacity: 0.4; }
.empty-state .empty-msg { font-size: 14px; margin-bottom: 6px; }
.empty-state .empty-hint { font-size: 12px; color: var(--text-muted); }

/* ===== Column info toggle ===== */
.col-info-toggle { display: inline-flex; align-items: center; gap: 4px; font-size: 12px; color: var(--accent); cursor: pointer; margin-left: 12px; user-select: none; }
.col-info-toggle:hover { text-decoration: underline; }
.col-info-panel { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 14px 18px; margin-bottom: 12px; display: none; font-size: 12px; line-height: 1.8; }
.col-info-panel.show { display: block; }
.col-info-panel dt { font-weight: 600; color: var(--text); display: inline; }
.col-info-panel dd { display: inline; color: var(--text-secondary); margin-left: 4px; margin-bottom: 0; }
.col-info-panel .info-row { margin-bottom: 4px; }

/* ===== Tooltip header icon ===== */
.th-info { cursor: help; opacity: 0.5; font-size: 10px; margin-left: 3px; vertical-align: super; }
.th-info:hover { opacity: 1; }

/* ===== Collapsible Accordion Sections ===== */
.accordion-section {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
  margin-bottom: 12px; overflow: hidden; box-shadow: var(--shadow);
}
.accordion-header {
  display: flex; align-items: center; gap: 10px; padding: 14px 18px;
  cursor: pointer; user-select: none; transition: background 0.15s;
  border-bottom: 1px solid transparent;
}
.accordion-header:hover { background: rgba(59,130,246,0.03); }
.accordion-header.open { border-bottom-color: var(--border); }
.accordion-arrow {
  font-size: 10px; color: var(--text-muted); transition: transform 0.25s; flex-shrink: 0; width: 16px; text-align: center;
}
.accordion-header.open .accordion-arrow { transform: rotate(180deg); }
.accordion-title {
  font-size: 14px; font-weight: 600; color: var(--text); flex: 1;
}
.accordion-badge {
  font-size: 11px; color: var(--text-muted); background: var(--bg);
  padding: 2px 10px; border-radius: 99px; font-weight: 500; white-space: nowrap;
}
.accordion-desc {
  font-size: 12px; color: var(--text-secondary); padding: 10px 18px 0;
  line-height: 1.6; border-bottom: 1px solid var(--border);
  padding-bottom: 10px;
}
.accordion-body {
  display: none; padding: 0;
}
.accordion-body.open { display: block; }
.accordion-body .table-scroll { border: none; border-radius: 0; box-shadow: none; }
.accordion-body .table-section { margin-bottom: 0; }
.accordion-body .table-section h3 { display: none; }

/* Table filter input inside accordion */
.table-filter-wrap {
  padding: 10px 18px; display: flex; align-items: center; gap: 8px;
  border-bottom: 1px solid var(--border); background: var(--bg);
}
.table-filter-input {
  padding: 6px 12px; border: 1px solid var(--border); border-radius: var(--radius-sm);
  background: var(--bg-card); color: var(--text); font-size: 12px; outline: none; flex: 1; max-width: 320px;
}
.table-filter-input:focus { border-color: var(--accent); box-shadow: 0 0 0 2px rgba(59,130,246,0.12); }
.table-filter-label { font-size: 12px; color: var(--text-secondary); font-weight: 500; white-space: nowrap; }
.table-row-count { font-size: 11px; color: var(--text-muted); margin-left: auto; white-space: nowrap; }

/* Section group title */
.section-group-title {
  font-size: 16px; font-weight: 700; color: var(--text);
  margin: 28px 0 14px; padding-bottom: 8px;
  border-bottom: 2px solid var(--accent); display: flex; align-items: center; gap: 8px;
}
.section-group-title .section-icon { font-size: 18px; }

/* ===== Zone Compare Dropdown (proper) ===== */
.zone-select-wrap {
  display: flex; align-items: center; gap: 8px; flex: 1; max-width: 480px;
}
.zone-select-wrap label { font-size: 13px; font-weight: 500; color: var(--text-secondary); white-space: nowrap; }
.zone-select-wrap select {
  padding: 8px 12px; border: 1px solid var(--border); border-radius: var(--radius-sm);
  background: var(--bg-card); color: var(--text); font-size: 13px; flex: 1; min-width: 200px;
  cursor: pointer;
}
.zone-select-wrap select:focus { border-color: var(--accent); box-shadow: 0 0 0 2px rgba(59,130,246,0.15); outline: none; }
.zone-search-input {
  padding: 8px 12px; border: 1px solid var(--border); border-radius: var(--radius-sm);
  background: var(--bg-card); color: var(--text); font-size: 13px; outline: none;
  flex: 1; min-width: 160px; max-width: 240px;
}
.zone-search-input:focus { border-color: var(--accent); box-shadow: 0 0 0 2px rgba(59,130,246,0.15); }

/* ===== Autocomplete ===== */
.autocomplete-list {
  position: absolute; top: 100%; left: 0; right: 0; z-index: 50;
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-sm);
  box-shadow: var(--shadow-lg); max-height: 240px; overflow-y: auto; margin-top: 4px;
}
.autocomplete-item {
  padding: 8px 14px; font-size: 13px; cursor: pointer; transition: background 0.1s;
  border-bottom: 1px solid var(--border);
}
.autocomplete-item:last-child { border-bottom: none; }
.autocomplete-item:hover, .autocomplete-item.active { background: rgba(59,130,246,0.08); color: var(--accent); }
.autocomplete-item .ac-match { font-weight: 700; color: var(--accent); }

/* ===== Zone Compare Cards ===== */
.zone-card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
  margin-bottom: 10px; overflow: hidden; box-shadow: var(--shadow); transition: box-shadow 0.2s;
}
.zone-card.highlighted { border-color: var(--accent); box-shadow: 0 0 0 2px rgba(59,130,246,0.2); }
.zone-card-header {
  display: flex; align-items: center; gap: 10px; padding: 12px 18px;
  cursor: pointer; user-select: none; transition: background 0.15s;
}
.zone-card-header:hover { background: rgba(59,130,246,0.03); }
.zone-card-name { font-size: 14px; font-weight: 600; flex: 1; }
.zone-card-summary { font-size: 12px; color: var(--text-secondary); display: flex; gap: 14px; }
.zone-card-summary span { white-space: nowrap; }
.zone-card-arrow { font-size: 10px; color: var(--text-muted); transition: transform 0.25s; }
.zone-card.open .zone-card-arrow { transform: rotate(180deg); }
.zone-card-body { display: none; border-top: 1px solid var(--border); }
.zone-card.open .zone-card-body { display: block; }
.zone-card-body .table-scroll { border: none; border-radius: 0; box-shadow: none; }

/* ===== Explanation panel ===== */
.explain-panel { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); margin-top: 16px; overflow: hidden; }
.explain-toggle {
  display: flex; align-items: center; gap: 8px; padding: 12px 18px; cursor: pointer; user-select: none;
  font-size: 13px; font-weight: 600; color: var(--accent); transition: background 0.15s;
}
.explain-toggle:hover { background: rgba(59,130,246,0.04); }
.explain-icon { font-size: 16px; }
.explain-arrow { margin-left: auto; font-size: 10px; transition: transform 0.2s; }
.explain-arrow.open { transform: rotate(180deg); }
.explain-body { padding: 0 18px 16px; font-size: 13px; line-height: 1.9; color: var(--text-secondary); }
.explain-body h5 { font-size: 13px; font-weight: 700; color: var(--text); margin: 12px 0 6px; }
.explain-body h5:first-child { margin-top: 4px; }
.explain-body p { margin-bottom: 6px; }
.explain-body .explain-item { padding-left: 12px; border-left: 3px solid var(--accent); margin-bottom: 8px; }
.explain-body .explain-item dt { font-weight: 600; color: var(--text); }
.explain-body .explain-item dd { margin-left: 0; color: var(--text-secondary); }
.explain-body .explain-clickable { cursor: pointer; transition: background 0.15s, border-color 0.15s; }
.explain-body .explain-clickable:hover { background: rgba(59,130,246,0.06); border-left-color: var(--accent); }
.explain-goto { font-size: 11px; color: var(--accent); font-weight: 500; opacity: 0; transition: opacity 0.15s; margin-left: 6px; }
.explain-clickable:hover .explain-goto { opacity: 1; }

/* Clickable component name in peak table */
.comp-name-cell { cursor: pointer; transition: color 0.15s; }
.comp-name-cell:hover { color: var(--accent); text-decoration: underline; }

/* Explain item highlight animation */
.explain-highlight {
  animation: explainFlash 2.5s ease-out;
  background: rgba(59,130,246,0.12) !important;
  border-left-color: var(--accent) !important;
}
@keyframes explainFlash {
  0% { background: rgba(59,130,246,0.3) !important; }
  100% { background: rgba(59,130,246,0.12) !important; }
}

/* Row highlight animation */
.row-highlight {
  animation: rowFlash 2s ease-out;
  background: rgba(59,130,246,0.15) !important;
}
.row-highlight td:first-child { background: rgba(59,130,246,0.15) !important; }
@keyframes rowFlash {
  0% { background: rgba(59,130,246,0.35) !important; }
  100% { background: rgba(59,130,246,0.15) !important; }
}

/* Column highlight */
.col-highlight {
  animation: colFlash 2s ease-out;
  background: rgba(59,130,246,0.13) !important;
  box-shadow: inset 0 0 0 2px rgba(59,130,246,0.25);
}
th.col-highlight {
  color: #111 !important;
  background: rgba(59,130,246,0.25) !important;
}
@keyframes colFlash {
  0% { background: rgba(59,130,246,0.3) !important; }
  100% { background: rgba(59,130,246,0.13) !important; }
}

/* Clickable table header */
.th-clickable { cursor: pointer; transition: color 0.15s; }
.th-clickable:hover { color: var(--accent); text-decoration: underline; }


/* Clickable info row */
.info-clickable { cursor: pointer; transition: background 0.15s; border-radius: var(--radius-sm); }
.info-clickable:hover { background: rgba(59,130,246,0.06); }
.info-clickable .explain-goto { font-size: 11px; color: var(--accent); opacity: 0; transition: opacity 0.15s; }
.info-clickable:hover .explain-goto { opacity: 1; }

/* ===== Floating navigation ===== */
.floating-nav {
  position: fixed;
  bottom: 32px;
  right: 32px;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 8px;
}
.scroll-top-btn, .toc-toggle-btn {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--accent);
  font-size: 18px;
  cursor: pointer;
  box-shadow: 0 4px 16px rgba(0,0,0,0.12);
  transition: opacity 0.25s, transform 0.25s, background 0.15s;
  opacity: 0.9;
}
.scroll-top-btn:hover, .toc-toggle-btn:hover {
  opacity: 1;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0,0,0,0.18);
}
.toc-toggle-btn.active {
  background: var(--accent);
  color: #fff;
}
.toc-panel {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 8px 32px rgba(0,0,0,0.15);
  padding: 12px 4px;
  max-height: 60vh;
  overflow-y: auto;
  min-width: 200px;
  max-width: 280px;
}
.toc-item {
  display: block;
  padding: 8px 14px;
  font-size: 12px;
  color: var(--text);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: background 0.12s;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  border: none;
  background: none;
  width: 100%;
  text-align: left;
}
.toc-item:hover { background: rgba(59,130,246,0.08); }
.toc-item.toc-active { color: var(--accent); font-weight: 600; background: rgba(59,130,246,0.06); }
.toc-item.toc-indent { padding-left: 28px; font-size: 11px; color: var(--text-secondary); }
.toc-divider { height: 1px; background: var(--border); margin: 6px 10px; }

/* Grand Total row clickable */
tr[data-comp="grand total"] td { cursor: pointer; }
tr[data-comp="grand total"] td:first-child { text-decoration: underline; text-decoration-style: dotted; }

/* ===== Footer ===== */
.footer { text-align: center; padding: 24px; font-size: 12px; color: var(--text-muted); margin-top: 40px; }

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .charts-row { grid-template-columns: 1fr; }
  .upload-area { padding: 40px 20px; }
  .tab-content { padding: 16px; }
  .chart-wrapper { height: 260px; }
  .tab-toolbar { flex-direction: column; align-items: flex-start; }
  .accordion-header { padding: 12px 14px; }
  .accordion-title { font-size: 13px; }
}