:root {
  --navy: #1B3A6B;
  --accent: #4F46E5;
  --accent-2: #8B5CF6;
  --bg: #F3F4F8;
  --bg-alt: #FFFFFF;
  --card-bg: #FFFFFF;
  --sidebar-bg: #FFFFFF;
  --text: #16192B;
  --text-sub: #666F8C;
  --border: #E4E6F0;
  --danger: #C0392B;
  --danger-bg: #FDEDEC;
  --series-1: #4F46E5;
  --series-2: #10B981;
  --track-bg: #EEF1F6;
  --accent-soft: rgba(79, 70, 229, .1);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --navy: #0B0F1D;
    --accent: #818CF8;
    --accent-2: #C084FC;
    --bg: #0A0D18;
    --bg-alt: #10142280;
    --card-bg: #141928;
    --sidebar-bg: #0D1120;
    --text: #E7E9F5;
    --text-sub: #8B93AE;
    --border: rgba(255, 255, 255, .08);
    --danger: #FF7A7A;
    --danger-bg: #3A2024;
    --series-1: #818CF8;
    --series-2: #34D399;
    --track-bg: #1C2233;
    --accent-soft: rgba(129, 140, 248, .16);
  }
}

:root[data-theme="dark"] {
  --navy: #0B0F1D;
  --accent: #818CF8;
  --accent-2: #C084FC;
  --bg: #0A0D18;
  --bg-alt: #10142280;
  --card-bg: #141928;
  --sidebar-bg: #0D1120;
  --text: #E7E9F5;
  --text-sub: #8B93AE;
  --border: rgba(255, 255, 255, .08);
  --danger: #FF7A7A;
  --danger-bg: #3A2024;
  --series-1: #818CF8;
  --series-2: #34D399;
  --track-bg: #1C2233;
  --accent-soft: rgba(129, 140, 248, .16);
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: 'Pretendard', -apple-system, 'Malgun Gothic', sans-serif;
  background: var(--bg);
  color: var(--text);
  transition: background-color .15s ease, color .15s ease;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Login */
.login-body {
  display: flex; align-items: center; justify-content: center;
  min-height: 100vh; background: var(--navy);
}
.login-card {
  background: var(--card-bg); padding: 40px; border-radius: 16px;
  width: 340px; box-shadow: 0 20px 60px rgba(0,0,0,.35); border: 1px solid var(--border);
}
.login-card h1 { font-size: 20px; margin: 0 0 4px; color: var(--text); }
.login-sub { color: var(--text-sub); font-size: 13px; margin: 0 0 20px; }
.login-card label { display: block; font-size: 13px; margin-bottom: 12px; color: var(--text-sub); }
.login-card input {
  width: 100%; padding: 10px; margin-top: 4px; border: 1px solid var(--border);
  border-radius: 8px; font-size: 14px; background: var(--bg-alt); color: var(--text);
}
.login-card button {
  width: 100%; padding: 11px; background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff; border: none; border-radius: 8px; font-size: 14px; cursor: pointer; margin-top: 8px;
  font-weight: 600;
}
.login-card button:hover { filter: brightness(1.08); }
.login-note { font-size: 12px; color: var(--text-sub); margin-top: 16px; }

/* App shell: sidebar + main area */
.app-shell { display: flex; min-height: 100vh; }

.sidebar {
  width: 250px; flex: none; background: var(--sidebar-bg); border-right: 1px solid var(--border);
  display: flex; flex-direction: column; position: sticky; top: 0; height: 100vh;
}
.sidebar-brand {
  display: flex; align-items: center; gap: 10px; padding: 20px 20px 16px;
  color: var(--text); font-weight: 800; font-size: 15px; border-bottom: 1px solid var(--border);
}
.sidebar-brand-icon { font-size: 18px; }
.sidebar-nav {
  flex: 1; overflow-y: auto; padding: 12px; display: flex; flex-direction: column; gap: 2px;
}
.sidebar-nav-item {
  display: flex; align-items: center; gap: 10px; padding: 9px 12px; border-radius: 8px;
  color: var(--text-sub); font-size: 13.5px; font-weight: 500; white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.sidebar-nav-item:hover { background: var(--accent-soft); color: var(--text); text-decoration: none; }
.sidebar-nav-item.active {
  background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: #fff; font-weight: 700;
  box-shadow: 0 4px 14px var(--accent-soft);
}
.nav-item-icon { font-size: 12px; opacity: .8; flex: none; }
.sidebar-empty { color: var(--text-sub); font-size: 13px; padding: 8px 12px; }

.main-area { flex: 1; min-width: 0; display: flex; flex-direction: column; }

.topbar {
  display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 16px 28px;
  background: var(--bg-alt); backdrop-filter: blur(10px); border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 10;
}
.crumbs { display: flex; gap: 8px; align-items: center; font-size: 14px; color: var(--text-sub); flex-wrap: wrap; }
.crumbs a { color: var(--text-sub); font-weight: 600; }
.crumbs a:hover { color: var(--accent); }
.crumb-home { font-size: 15px; }
.crumb-sep { color: var(--text-sub); opacity: .5; }
.crumb-current { color: var(--text); font-weight: 700; }

.topbar-actions { display: flex; align-items: center; gap: 10px; font-size: 13px; }
.user-pill {
  color: var(--text); background: var(--card-bg); border: 1px solid var(--border);
  padding: 6px 14px; border-radius: 999px; font-weight: 600;
}
.btn-logout {
  color: var(--text-sub); border: 1px solid var(--border); padding: 6px 14px; border-radius: 999px;
}
.btn-logout:hover { color: var(--danger); border-color: var(--danger); text-decoration: none; }

.theme-toggle {
  background: var(--card-bg); border: 1px solid var(--border); border-radius: 999px;
  width: 32px; height: 32px; font-size: 14px; line-height: 1; cursor: pointer;
  display: flex; align-items: center; justify-content: center; color: var(--text);
}
.theme-toggle:hover { border-color: var(--accent); }
.login-theme-toggle {
  position: fixed; top: 16px; right: 16px; background: var(--card-bg);
}

.content { flex: 1; padding: 28px; max-width: 1400px; width: 100%; margin: 0 auto; }

/* Page head */
.page-head { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-bottom: 20px; flex-wrap: wrap; }
.page-head h1 { font-size: 21px; font-weight: 800; color: var(--text); margin: 0; }
.page-head-actions { display: flex; gap: 10px; flex-wrap: wrap; }
.content h2 { font-size: 15px; color: var(--text); margin: 28px 0 12px; font-weight: 700; }

.card-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 12px; }
.item-card {
  display: flex; align-items: center; gap: 10px; padding: 16px; background: var(--card-bg);
  border: 1px solid var(--border); border-radius: 12px; color: var(--text); font-weight: 600;
  transition: all .15s ease;
}
.item-card:hover { border-color: var(--accent); text-decoration: none; transform: translateY(-2px); box-shadow: 0 8px 20px rgba(0,0,0,.08); }
.item-icon { font-size: 18px; }

/* Data card: icon + title header wrapping a table */
.data-card {
  background: var(--card-bg); border: 1px solid var(--border); border-radius: 16px;
  overflow: hidden; box-shadow: 0 2px 10px rgba(0,0,0,.04); margin-bottom: 16px;
}
.data-card-header {
  display: flex; align-items: center; gap: 10px; padding: 16px 20px; border-bottom: 1px solid var(--border);
}
.dc-icon {
  width: 30px; height: 30px; flex: none; border-radius: 8px; background: var(--accent-soft); color: var(--accent);
  display: flex; align-items: center; justify-content: center; font-size: 14px;
}
.data-card-header h3 { margin: 0; font-size: 15px; font-weight: 700; color: var(--text); }
.dc-sub { font-size: 12.5px; color: var(--text-sub); font-weight: 500; margin-left: 4px; }

.grid-table { width: 100%; border-collapse: collapse; background: var(--card-bg); font-size: 13px; font-family: 'JetBrains Mono', monospace; }
.grid-table th, .grid-table td {
  padding: 10px 16px; border-bottom: 1px solid var(--border); text-align: left; white-space: nowrap;
}
.grid-table th { background: var(--bg); color: var(--text-sub); font-weight: 600; position: sticky; top: 0; font-family: 'Pretendard', sans-serif; font-size: 12.5px; letter-spacing: .02em; }
.grid-table tbody tr:hover { background: var(--accent-soft); }
.grid-table .empty { text-align: center; color: var(--text-sub); padding: 24px; font-family: 'Pretendard', sans-serif; }
.grid-table .null { color: var(--text-sub); font-style: italic; }
.table-scroll { overflow: auto; max-height: 65vh; }
.data-card .table-scroll { border-radius: 0; }

.tabs { display: flex; gap: 8px; margin-bottom: 20px; flex-wrap: wrap; }
.tabs .tab {
  display: inline-flex; align-items: center; gap: 7px; padding: 9px 18px; border-radius: 999px;
  color: var(--text-sub); font-weight: 600; font-size: 13px; border: 1px solid var(--border); background: var(--card-bg);
}
.tabs .tab:hover { border-color: var(--accent); color: var(--text); text-decoration: none; }
.tabs .tab.active {
  background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: #fff; border-color: transparent;
  box-shadow: 0 6px 16px var(--accent-soft);
}
.tab-icon { font-size: 12px; }

.pagination { display: flex; gap: 16px; align-items: center; padding: 14px 20px; font-size: 13px; color: var(--text-sub); border-top: 1px solid var(--border); }

.btn-pill {
  display: inline-flex; align-items: center; gap: 6px; padding: 9px 18px; background: var(--card-bg);
  color: var(--text); border: 1px solid var(--border); border-radius: 999px; font-size: 13px; font-weight: 600;
}
.btn-pill:hover { border-color: var(--accent); color: var(--accent); text-decoration: none; }
.btn-pill-solid {
  background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: #fff; border-color: transparent;
  box-shadow: 0 6px 16px var(--accent-soft);
}
.btn-pill-solid:hover { color: #fff; filter: brightness(1.08); }

.hint { color: var(--text-sub); font-size: 13px; margin-bottom: 12px; }
.sql-form textarea, form textarea {
  width: 100%; font-family: 'JetBrains Mono', monospace; font-size: 13px; padding: 12px;
  border: 1px solid var(--border); border-radius: 10px; resize: vertical; background: var(--card-bg); color: var(--text);
}
.sql-form button, form button:not(.theme-toggle) {
  margin-top: 10px; padding: 9px 22px; border: none; border-radius: 999px; cursor: pointer; font-weight: 600;
}

.alert { padding: 10px 14px; border-radius: 10px; font-size: 13px; margin-bottom: 16px; }
.alert-error { background: var(--danger-bg); color: var(--danger); border: 1px solid rgba(255,122,122,.3); }

/* Dashboard */
.stat-tiles { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 12px; margin-bottom: 8px; }
.stat-tile {
  background: var(--card-bg); border: 1px solid var(--border); border-radius: 14px;
  padding: 16px 18px; display: flex; flex-direction: column; gap: 6px;
}
.stat-label { font-size: 12px; color: var(--text-sub); }
.stat-value { font-size: 28px; font-weight: 700; color: var(--text); font-variant-numeric: proportional-nums; }

.chart-legend { display: flex; gap: 20px; margin-bottom: 10px; font-size: 13px; color: var(--text-sub); }
.legend-item { display: flex; align-items: center; gap: 6px; }
.legend-swatch { width: 10px; height: 10px; border-radius: 3px; display: inline-block; }
.legend-swatch.series-1 { background: var(--series-1); }
.legend-swatch.series-2 { background: var(--series-2); }

.bar-chart {
  background: var(--card-bg); border: 1px solid var(--border); border-radius: 14px;
  padding: 18px 20px; display: flex; flex-direction: column; gap: 18px;
}
.chart-group { display: flex; align-items: center; gap: 16px; }
.chart-group-label { width: 76px; flex: none; font-size: 13px; color: var(--text-sub); font-variant-numeric: tabular-nums; }
.chart-group-bars { flex: 1; display: flex; flex-direction: column; gap: 2px; }
.bar-row { display: flex; align-items: center; gap: 10px; }
.bar-track { flex: 1; height: 20px; background: var(--track-bg); border-radius: 4px; overflow: hidden; }
.bar { height: 20px; max-height: 20px; border-radius: 0 4px 4px 0; }
.bar.series-1 { background: var(--series-1); }
.bar.series-2 { background: var(--series-2); }
.bar-value { width: 44px; flex: none; text-align: right; font-size: 13px; color: var(--text-sub); font-variant-numeric: tabular-nums; }

@media (max-width: 860px) {
  .app-shell { flex-direction: column; }
  .sidebar { width: 100%; height: auto; position: static; flex-direction: row; overflow-x: auto; }
  .sidebar-brand { border-bottom: none; border-right: 1px solid var(--border); flex: none; }
  .sidebar-nav { flex-direction: row; overflow-x: auto; overflow-y: visible; }
  .sidebar-nav-item { flex: none; }
  .content { padding: 18px; }
  .topbar { padding: 12px 18px; }
}