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

:root {
  --bg:            #f5f5f7;
  --card-bg:       #fff;
  --text:          #1d1d1f;
  --text-secondary:#86868b;
  --text-tertiary: #515154;
  --border:        #e5e5ea;
  --border-light:  #f0f0f2;
  --border-dashed: #c7c7cc;
  --shadow:        0 1px 3px rgba(0,0,0,0.06);
  --hover-bg:      #f9fafb;
  --hover-bg2:     #f0f0f2;
  --drop-hover-bg: #f0f0ff;
  --drop-hover-border: #6366f1;
  --loaded-bg:     #f0fdf4;
  --loaded-border: #10b981;
  --chip-bg:       #fafafa;
  --chip-checked-bg: #eef2ff;
  --chip-checked-border: #6366f1;
  --chip-checked-text:   #4338ca;
  --key-color:     #6366f1;
  --error-bg:      #fef2f2;
  --error-border:  #fecaca;
  --error-text:    #dc2626;
  --footer-text:   #c7c7cc;
}

[data-theme="dark"] {
  --bg:            #1c1c1e;
  --card-bg:       #2c2c2e;
  --text:          #f5f5f7;
  --text-secondary:#98989d;
  --text-tertiary: #aeaeb2;
  --border:        #38383a;
  --border-light:  #38383a;
  --border-dashed: #48484a;
  --shadow:        0 1px 3px rgba(0,0,0,0.3);
  --hover-bg:      #3a3a3c;
  --hover-bg2:     #444446;
  --drop-hover-bg: #1e1e30;
  --drop-hover-border: #818cf8;
  --loaded-bg:     #1a2a1e;
  --loaded-border: #34d399;
  --chip-bg:       #3a3a3c;
  --chip-checked-bg: #1e1e30;
  --chip-checked-border: #818cf8;
  --chip-checked-text:   #a5b4fc;
  --key-color:     #818cf8;
  --error-bg:      #3b1a1a;
  --error-border:  #662222;
  --error-text:    #f87171;
  --footer-text:   #48484a;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

.container { max-width: 1100px; margin: 0 auto; padding: 24px 16px; }

header { text-align: center; margin-bottom: 24px; position: relative; }
header h1 { font-size: 24px; font-weight: 700; color: var(--text); }
header p  { font-size: 14px; color: var(--text-secondary); margin-top: 4px; }

/* ---- theme toggle ---- */
.theme-toggle {
  position: absolute;
  right: 0;
  top: 0;
  width: 36px; height: 36px;
  border: 1px solid var(--border);
  border-radius: 50%;
  background: var(--card-bg);
  cursor: pointer;
  font-size: 16px;
  display: flex; align-items: center; justify-content: center;
  transition: all 0.2s;
  color: var(--text);
  line-height: 1;
}
.theme-toggle:hover { background: var(--hover-bg); }

/* ---- drop zone ---- */
.drop-zone {
  border: 2px dashed var(--border-dashed);
  border-radius: 16px;
  padding: 48px 24px;
  text-align: center;
  background: var(--card-bg);
  cursor: pointer;
  transition: all 0.2s;
  margin-bottom: 24px;
}
.drop-zone:hover,
.drop-zone.drag-over { border-color: var(--drop-hover-border); background: var(--drop-hover-bg); }
.drop-zone.loaded       { border-color: var(--loaded-border); background: var(--loaded-bg); }
.drop-zone .icon        { font-size: 40px; margin-bottom: 8px; }
.drop-zone .text        { font-size: 15px; color: var(--text-tertiary); }
.drop-zone .hint        { font-size: 12px; color: var(--text-secondary); margin-top: 4px; }
.drop-zone .file-name   { font-size: 13px; color: var(--loaded-border); margin-top: 8px; font-weight: 500; }
.clear-cache-btn {
  font-size: 12px; padding: 4px 12px; margin-top: 6px;
  border: 1px solid var(--border); border-radius: 6px;
  background: var(--card-bg); color: var(--text-secondary); cursor: pointer;
}
.clear-cache-btn:hover { background: var(--hover-bg); }

/* ---- summary cards ---- */
.summary {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px;
  margin-bottom: 24px;
}
.summary-card {
  background: var(--card-bg);
  border-radius: 12px;
  padding: 16px 20px;
  box-shadow: var(--shadow);
}
.summary-card .label { font-size: 12px; color: var(--text-secondary); margin-bottom: 4px; }
.summary-card .value { font-size: 22px; font-weight: 700; color: var(--text); }
.summary-card .sub   { font-size: 12px; color: var(--text-secondary); margin-top: 2px; }

/* section divider */
.section-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 12px;
}

/* ---- filter bar ---- */
.filter-bar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
  padding: 12px 16px;
  background: var(--card-bg);
  border-radius: 12px;
  box-shadow: var(--shadow);
}
.filter-label { font-size: 13px; color: var(--text-secondary); white-space: nowrap; }
.filter-row {
  display: flex; align-items: center; flex-wrap: wrap; gap: 8px;
  flex-basis: 100%;
}
.filter-row + .filter-row { margin-top: 8px; }
.filter-keys { display: flex; flex-wrap: wrap; gap: 4px; }
.filter-chip {
  display: inline-flex; align-items: center; gap: 4px;
  font-size: 12px; padding: 4px 10px;
  border: 1px solid var(--border); border-radius: 16px;
  cursor: pointer; transition: all 0.15s;
  user-select: none; background: var(--chip-bg); color: var(--text-tertiary);
}
.filter-chip:has(input:checked) {
  background: var(--chip-checked-bg);
  border-color: var(--chip-checked-border);
  color: var(--chip-checked-text);
}
.filter-chip input { display: none; }
.filter-btn {
  font-size: 12px; padding: 4px 12px;
  border: 1px solid var(--border); border-radius: 8px;
  cursor: pointer; background: var(--card-bg); color: var(--text-tertiary);
  transition: all 0.15s;
}
.filter-btn:hover { background: var(--hover-bg); }
.filter-btn-dim { color: var(--text-secondary); }

/* ---- date inputs ---- */
.filter-bar input[type="date"] {
  font-size: 13px;
  padding: 4px 8px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
  color: var(--text);
}

/* ---- detail table ---- */
.table-card {
  background: var(--card-bg);
  border-radius: 16px;
  padding: 20px;
  box-shadow: var(--shadow);
  margin-bottom: 24px;
}
.table-card h2 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 12px;
}
.summary-toggle {
  font-size: 12px;
  font-weight: 400;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 4px;
  cursor: pointer;
  user-select: none;
}
.summary-toggle input { accent-color: var(--key-color); }
.chart-toggle {
  font-size: 12px;
  font-weight: 400;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 4px;
  cursor: pointer;
  user-select: none;
}
.chart-toggle input { accent-color: var(--key-color); }
#keyTable.summary-only tbody tr.model-row { display: none; }
.table-scroll { overflow-x: auto; }
#keyTable {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  white-space: nowrap;
}
#keyTable thead th {
  background: var(--hover-bg);
  color: var(--text-tertiary);
  font-weight: 600;
  padding: 10px 14px;
  text-align: right;
  border-bottom: 2px solid var(--border);
}
#keyTable thead th:first-child { text-align: left; }
#keyTable tbody td {
  padding: 10px 14px;
  text-align: right;
  border-bottom: 1px solid var(--border-light);
  color: var(--text);
  transition: background 0.15s ease;
}
#keyTable tbody td:first-child {
  text-align: left;
  font-weight: 500;
  color: var(--key-color);
}
#keyTable tbody tr:hover { background: var(--hover-bg); }
#keyTable tbody tr.model-row:hover td:first-child {
  background: var(--hover-bg);
}
#keyTable tbody tr.subtotal-row {
  font-weight: 600;
  border-top: 1px solid var(--border);
  background: var(--hover-bg);
}
#keyTable tbody tr.subtotal-row:hover { background: var(--hover-bg2); }
#keyTable tbody tr.model-row .model-label {
  color: var(--text-secondary);
  font-weight: 400;
}
#keyTable tbody tr.total-row {
  font-weight: 700;
  border-top: 2px solid var(--border);
  background: var(--hover-bg);
}
#keyTable .val-cost { font-variant-numeric: tabular-nums; font-weight: 600; }
#keyTable .val-rate { font-variant-numeric: tabular-nums; }

/* ---- chart legend ---- */
.chart-legend {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  margin-top: 12px;
}
.chart-legend .legend-row {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 8px;
  justify-content: center;
}
.legend-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-family: sans-serif;
  color: #54555a;
  cursor: pointer;
  padding: 2px 8px;
  border-radius: 6px;
  transition: opacity 0.2s;
  user-select: none;
}
[data-theme="dark"] .legend-item {
  color: #cbcbce;
}
.legend-item .legend-dot {
  width: 22px;
  height: 12px;
  border-radius: 3px;
  flex-shrink: 0;
}
.legend-item.dimmed {
  opacity: 0.35;
}
.legend-item:hover {
  background: var(--hover-bg);
}

/* ---- charts grid ---- */
.charts {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.chart-card {
  background: var(--card-bg);
  border-radius: 16px;
  padding: 20px;
  box-shadow: var(--shadow);
  min-width: 0;
}
.chart-card h2 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 12px;
}
.chart-wrap {
  position: relative;
  width: 100%;
  height: 380px;
  overflow: hidden;
}
.chart-wrap > div {
  width: 100%;
  height: 100%;
}

.chart-full { grid-column: 1 / -1; }

@media (max-width: 750px) {
  .charts { grid-template-columns: 1fr; }
  .chart-full { grid-column: 1; }
}

/* ---- messages ---- */
.error {
  background: var(--error-bg);
  border: 1px solid var(--error-border);
  border-radius: 12px;
  padding: 16px;
  color: var(--error-text);
  font-size: 14px;
  margin-bottom: 24px;
  display: none;
}
.loading {
  display: none;
  text-align: center;
  padding: 24px;
  color: var(--text-secondary);
  font-size: 14px;
}

/* ---- footer ---- */
footer {
  text-align: center;
  margin-top: 32px;
  font-size: 12px;
  color: var(--footer-text);
}
footer a { color: var(--text-secondary); }