/* Art direction: GitHub Copilot AI usage dashboard → clean, technical, data-forward
   Palette: dark navy surfaces, teal primary accent (GitHub-adjacent)
   Typography: Inter body — crisp, functional
   Density: balanced-dense (dashboard) */

:root, [data-theme="light"] {
  --color-bg: #f6f8fa;
  --color-surface: #ffffff;
  --color-surface-2: #f9fafb;
  --color-surface-offset: #f0f2f5;
  --color-divider: #e1e4e8;
  --color-border: #d0d7de;
  --color-text: #1f2328;
  --color-text-muted: #656d76;
  --color-text-faint: #9198a1;
  --color-primary: #0969da;
  --color-primary-hover: #0550ae;
  --color-primary-active: #033d8b;
  --color-primary-highlight: #ddf4ff;
  --color-success: #1a7f37;
  --color-success-bg: #dafbe1;
  --color-warning: #9a6700;
  --color-warning-bg: #fff8c5;
  --color-error: #cf222e;
  --color-error-bg: #ffebe9;
  --color-sidebar-bg: #161b22;
  --color-sidebar-text: #e6edf3;
  --color-sidebar-muted: #8d96a0;
  --color-sidebar-active-bg: #21262d;
  --color-sidebar-border: #30363d;
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;
  --shadow-sm: 0 1px 3px rgba(31,35,40,0.06), 0 1px 2px rgba(31,35,40,0.04);
  --shadow-md: 0 4px 12px rgba(31,35,40,0.08);
  --shadow-lg: 0 12px 32px rgba(31,35,40,0.12);
  --transition: 180ms cubic-bezier(0.16,1,0.3,1);
  --sidebar-width: 220px;
  --topbar-height: 58px;
  --font-body: 'Inter', -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.8125rem);
  --text-sm: clamp(0.8125rem, 0.78rem + 0.15vw, 0.875rem);
  --text-base: 0.9375rem;
  --text-lg: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-xl: clamp(1.25rem, 1.1rem + 0.75vw, 1.75rem);
  --space-1: 0.25rem; --space-2: 0.5rem; --space-3: 0.75rem; --space-4: 1rem;
  --space-5: 1.25rem; --space-6: 1.5rem; --space-8: 2rem; --space-10: 2.5rem;
  --space-12: 3rem; --space-16: 4rem;

  /* Chart palette — categorical */
  --chart-1: #2563eb;
  --chart-2: #7c3aed;
  --chart-3: #db2777;
  --chart-4: #ea580c;
  --chart-5: #ca8a04;
  --chart-6: #16a34a;
  --chart-7: #0891b2;
  --chart-8: #9333ea;
  --chart-9: #e11d48;
  --chart-10: #0d9488;
}

[data-theme="dark"] {
  --color-bg: #0d1117;
  --color-surface: #161b22;
  --color-surface-2: #21262d;
  --color-surface-offset: #1c2128;
  --color-divider: #30363d;
  --color-border: #3d444d;
  --color-text: #e6edf3;
  --color-text-muted: #8d96a0;
  --color-text-faint: #6e7681;
  --color-primary: #4493f8;
  --color-primary-hover: #6cb0ff;
  --color-primary-highlight: #0d2849;
  --color-success: #3fb950;
  --color-success-bg: #0d2e17;
  --color-warning: #d29922;
  --color-warning-bg: #272115;
  --color-error: #f85149;
  --color-error-bg: #2d0f0f;
  --color-sidebar-bg: #010409;
  --color-sidebar-text: #e6edf3;
  --color-sidebar-muted: #6e7681;
  --color-sidebar-active-bg: #21262d;
  --color-sidebar-border: #21262d;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
  --shadow-lg: 0 12px 32px rgba(0,0,0,0.5);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-font-smoothing: antialiased; scroll-behavior: smooth; }
body { font-family: var(--font-body); font-size: var(--text-base); color: var(--color-text); background: var(--color-bg); line-height: 1.5; min-height: 100dvh; }
button, input, select { font: inherit; color: inherit; }
button { cursor: pointer; background: none; border: none; }
table { border-collapse: collapse; width: 100%; }
img, svg { display: block; max-width: 100%; }

/* Layout */
.app-layout { display: flex; min-height: 100dvh; }

/* Sidebar */
.sidebar {
  width: var(--sidebar-width);
  background: var(--color-sidebar-bg);
  border-right: 1px solid var(--color-sidebar-border);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0; left: 0; bottom: 0;
  z-index: 100;
  transition: transform var(--transition);
}
.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-4);
  border-bottom: 1px solid var(--color-sidebar-border);
  height: var(--topbar-height);
}
.logo { display: flex; align-items: center; gap: var(--space-2); }
.logo-text { font-size: var(--text-sm); font-weight: 600; color: var(--color-sidebar-text); letter-spacing: 0.01em; }
.sidebar-close { color: var(--color-sidebar-muted); padding: var(--space-1); border-radius: var(--radius-sm); display: none; }
.sidebar-close:hover { color: var(--color-sidebar-text); }

.sidebar-nav { flex: 1; padding: var(--space-3) var(--space-2); display: flex; flex-direction: column; gap: var(--space-1); }
.nav-item {
  display: flex; align-items: center; gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  color: var(--color-sidebar-muted);
  text-decoration: none;
  font-size: var(--text-sm);
  font-weight: 500;
  transition: background var(--transition), color var(--transition);
}
.nav-item:hover { background: var(--color-sidebar-active-bg); color: var(--color-sidebar-text); }
.nav-item.active { background: var(--color-sidebar-active-bg); color: var(--color-sidebar-text); }

.sidebar-footer {
  padding: var(--space-4);
  border-top: 1px solid var(--color-sidebar-border);
  display: flex; align-items: center; gap: var(--space-2);
}
.upload-btn {
  display: flex; align-items: center; gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  background: var(--color-primary);
  color: white;
  border-radius: var(--radius-md);
  font-size: var(--text-xs);
  font-weight: 600;
  cursor: pointer;
  flex: 1;
  transition: background var(--transition);
}
.upload-btn:hover { background: var(--color-primary-hover); }
.theme-toggle {
  color: var(--color-sidebar-muted);
  padding: var(--space-2);
  border-radius: var(--radius-md);
  transition: color var(--transition);
}
.theme-toggle:hover { color: var(--color-sidebar-text); }

/* Main wrapper */
.main-wrapper {
  margin-left: var(--sidebar-width);
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 100dvh;
}

/* Topbar */
.topbar {
  position: sticky; top: 0; z-index: 50;
  height: var(--topbar-height);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 var(--space-6);
  gap: var(--space-4);
}
.topbar-left { display: flex; align-items: center; gap: var(--space-3); min-width: 0; }
.hamburger { display: none; color: var(--color-text-muted); padding: var(--space-1); border-radius: var(--radius-sm); }
.hamburger:hover { color: var(--color-text); }
.page-title-wrap { min-width: 0; }
.page-title { font-size: var(--text-base); font-weight: 600; line-height: 1.2; }
.page-subtitle { font-size: var(--text-xs); color: var(--color-text-muted); }
.topbar-right { display: flex; align-items: center; gap: var(--space-3); flex-shrink: 0; }
.date-range { font-size: var(--text-xs); color: var(--color-text-muted); font-variant-numeric: tabular-nums; }
.quota-badge {
  display: flex; align-items: center; gap: var(--space-2);
  padding: var(--space-1) var(--space-3);
  background: var(--color-primary-highlight);
  color: var(--color-primary);
  border-radius: var(--radius-full);
  font-size: var(--text-xs); font-weight: 600;
  font-variant-numeric: tabular-nums;
}

/* Main content */
.main-content { flex: 1; padding: var(--space-6); max-width: 1400px; }

/* Views */
.view { display: none; }
.view.active { display: block; }

/* KPI Grid */
.kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}
.kpi-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5) var(--space-5);
  box-shadow: var(--shadow-sm);
}
.kpi-label { font-size: var(--text-xs); color: var(--color-text-muted); font-weight: 500; text-transform: uppercase; letter-spacing: 0.04em; margin-bottom: var(--space-2); }
.kpi-value { font-size: var(--text-xl); font-weight: 700; font-variant-numeric: tabular-nums; line-height: 1.1; color: var(--color-text); }
.kpi-sub { font-size: var(--text-xs); color: var(--color-text-muted); margin-top: var(--space-1); }
.kpi-progress-wrap { margin-top: var(--space-3); }
.kpi-progress-bar { height: 6px; background: var(--color-divider); border-radius: var(--radius-full); overflow: hidden; }
.kpi-progress-fill { height: 100%; background: var(--color-primary); border-radius: var(--radius-full); transition: width 0.8s cubic-bezier(0.16,1,0.3,1); width: 0; }

/* Chart cards */
.chart-section { margin-bottom: var(--space-6); }
.chart-card, .table-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}
.full-width { width: 100%; }
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-4); }
.chart-header {
  display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: var(--space-2);
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--color-divider);
}
.chart-title { font-size: var(--text-sm); font-weight: 600; color: var(--color-text); }
.chart-controls { display: flex; gap: var(--space-2); }
.chip {
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--text-xs); font-weight: 500;
  background: var(--color-surface-offset);
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
  cursor: pointer;
  transition: all var(--transition);
}
.chip.active, .chip:hover { background: var(--color-primary); color: white; border-color: var(--color-primary); }
.chart-wrap { padding: var(--space-4) var(--space-5); position: relative; height: 300px; }
.chart-wrap--sm { height: 260px; }
.chart-wrap canvas { max-height: 100%; }

/* Tables */
.table-wrap { overflow-x: auto; }
table { width: 100%; }
thead { background: var(--color-surface-2); }
th {
  padding: var(--space-3) var(--space-5);
  font-size: var(--text-xs); font-weight: 600;
  color: var(--color-text-muted);
  text-align: left;
  text-transform: uppercase; letter-spacing: 0.04em;
  border-bottom: 1px solid var(--color-divider);
}
th.num, td.num { text-align: right; font-variant-numeric: tabular-nums; }
td {
  padding: var(--space-3) var(--space-5);
  font-size: var(--text-sm);
  border-bottom: 1px solid var(--color-divider);
  color: var(--color-text);
}
tbody tr:last-child td { border-bottom: none; }
tbody tr:hover { background: var(--color-surface-2); }
.model-dot {
  display: inline-block;
  width: 8px; height: 8px;
  border-radius: 50%;
  margin-right: var(--space-2);
  flex-shrink: 0;
}
.td-model { display: flex; align-items: center; }

/* Breakdown select */
.breakdown-user-select {
  display: flex; align-items: center; gap: var(--space-3);
  margin-bottom: var(--space-6);
}
.select-label { font-size: var(--text-sm); font-weight: 600; color: var(--color-text); }
.user-select-input {
  padding: var(--space-2) var(--space-3);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  color: var(--color-text);
  cursor: pointer;
}
.user-select-input:focus { outline: 2px solid var(--color-primary); outline-offset: 2px; }

/* Empty state */
.empty-state {
  display: flex; flex-direction: column; align-items: center;
  text-align: center; padding: var(--space-16) var(--space-8);
  color: var(--color-text-muted);
}
.empty-icon { margin-bottom: var(--space-4); color: var(--color-text-faint); }
.empty-state h3 { font-size: var(--text-lg); font-weight: 600; color: var(--color-text); margin-bottom: var(--space-2); }
.empty-state p { font-size: var(--text-sm); max-width: 36ch; margin-bottom: var(--space-6); }
.btn-primary {
  display: inline-flex; align-items: center; gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  background: var(--color-primary); color: white;
  border-radius: var(--radius-md); font-size: var(--text-sm); font-weight: 600;
  cursor: pointer; text-decoration: none;
  transition: background var(--transition);
}
.btn-primary:hover { background: var(--color-primary-hover); }

/* Toast */
.toast {
  position: fixed; bottom: var(--space-6); right: var(--space-6);
  background: var(--color-text); color: var(--color-bg);
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-md);
  font-size: var(--text-sm); font-weight: 500;
  box-shadow: var(--shadow-lg);
  opacity: 0; transform: translateY(8px);
  transition: opacity 0.3s, transform 0.3s;
  pointer-events: none; z-index: 999;
}
.toast.show { opacity: 1; transform: translateY(0); }

/* Skeleton */
@keyframes shimmer { 0%{background-position:-200% 0} 100%{background-position:200% 0} }
.skeleton {
  display: inline-block;
  background: linear-gradient(90deg, var(--color-divider) 25%, var(--color-surface-offset) 50%, var(--color-divider) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s ease-in-out infinite;
  border-radius: var(--radius-sm);
}

/* Responsive */
@media (max-width: 900px) {
  .two-col { grid-template-columns: 1fr; }
  .kpi-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
  }
  .sidebar.open { transform: translateX(0); box-shadow: var(--shadow-lg); }
  .sidebar-close { display: flex; }
  .main-wrapper { margin-left: 0; }
  .hamburger { display: flex; }
  .main-content { padding: var(--space-4); }
  .topbar { padding: 0 var(--space-4); }
  .kpi-grid { grid-template-columns: 1fr 1fr; }
  .quota-badge { display: none; }
}
@media (max-width: 480px) {
  .kpi-grid { grid-template-columns: 1fr; }
}