:root {
  --bg: #f8fafc;
  --surface: #ffffff;
  --surface-alt: #eef2f7;
  --text: #0f172a;
  --text-muted: #475569;
  --border: #cbd5e1;
  --accent: #2563eb;
  --accent-contrast: #ffffff;
  --focus-ring: #2563eb;
  --danger-bg: #fef2f2;
  --danger-text: #991b1b;
  --shadow: 0 1px 2px rgba(15, 23, 42, 0.08), 0 1px 1px rgba(15, 23, 42, 0.04);
}

:root[data-theme="dark"] {
  --bg: #0b1220;
  --surface: #111827;
  --surface-alt: #1f2937;
  --text: #f1f5f9;
  --text-muted: #b8c2d1;
  --border: #334155;
  --accent: #60a5fa;
  --accent-contrast: #0b1220;
  --focus-ring: #93c5fd;
  --danger-bg: #3b1220;
  --danger-text: #fca5a5;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.5), 0 1px 1px rgba(0, 0, 0, 0.3);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0b1220;
    --surface: #111827;
    --surface-alt: #1f2937;
    --text: #f1f5f9;
    --text-muted: #b8c2d1;
    --border: #334155;
    --accent: #60a5fa;
    --accent-contrast: #0b1220;
    --focus-ring: #93c5fd;
    --danger-bg: #3b1220;
    --danger-text: #fca5a5;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.5), 0 1px 1px rgba(0, 0, 0, 0.3);
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Pretendard", "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
  line-height: 1.5;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--accent);
  color: var(--accent-contrast);
  padding: 8px 16px;
  z-index: 100;
}

.skip-link:focus {
  left: 16px;
  top: 16px;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

a,
button,
input,
select {
  font: inherit;
  color: inherit;
}

:focus-visible {
  outline: 3px solid var(--focus-ring);
  outline-offset: 2px;
}

.site-header {
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.header-inner h1 {
  font-size: 1.25rem;
  margin: 0;
}

#theme-toggle,
#reset-filters {
  background: var(--surface-alt);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 14px;
  cursor: pointer;
}

#theme-toggle:hover,
#reset-filters:hover {
  background: var(--border);
}

main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 16px;
}

.filters {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  margin-bottom: 20px;
  box-shadow: var(--shadow);
}

.filters-row {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: flex-end;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.field label {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.field input,
.field select {
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  min-width: 160px;
}

.filter-message {
  margin: 12px 0 0;
  padding: 10px 12px;
  border-radius: 8px;
  background: var(--danger-bg);
  color: var(--danger-text);
  font-weight: 600;
}

.empty-state {
  text-align: center;
  padding: 48px 16px;
  color: var(--text-muted);
  font-size: 1.05rem;
}

.kpi-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 12px;
  margin-bottom: 20px;
}

.kpi-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  box-shadow: var(--shadow);
}

.kpi-label {
  color: var(--text-muted);
  font-size: 0.85rem;
}

.kpi-value {
  font-size: 1.5rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.charts-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-bottom: 20px;
}

.chart-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  box-shadow: var(--shadow);
}

.chart-card--wide {
  grid-column: 1 / -1;
}

.chart-card h3 {
  margin: 0 0 12px;
  font-size: 1rem;
}

.chart-wrap {
  position: relative;
  height: 280px;
}

.table-section {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  box-shadow: var(--shadow);
}

.table-note {
  color: var(--text-muted);
  font-size: 0.85rem;
  margin-top: 0;
}

.table-scroll {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 560px;
}

th,
td {
  text-align: left;
  padding: 8px 10px;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

th {
  background: var(--surface-alt);
  position: sticky;
  top: 0;
}

td:nth-child(n + 4),
th:nth-child(n + 4) {
  text-align: right;
}

.site-footer {
  max-width: 1200px;
  margin: 0 auto;
  padding: 16px;
  color: var(--text-muted);
  font-size: 0.85rem;
}

@media (max-width: 900px) {
  .kpi-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .charts-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 520px) {
  .kpi-grid {
    grid-template-columns: 1fr;
  }
  .field input,
  .field select {
    min-width: 0;
    width: 100%;
  }
  .filters-row {
    flex-direction: column;
    align-items: stretch;
  }
}