/**
 * DanceOS Design System — Core Stylesheet
 * Strict adherence to Design Strategy: Product Mode, High Contrast (WCAG AA),
 * Typography pairings (Plus Jakarta Sans + DM Sans + JetBrains Mono),
 * Crisp, deliberate geometry and snappy micro-transitions.
 */

@import url('https://fonts.googleapis.com/css2?family=DM+Sans:ital,opsz,wght@0,9..40,400;0,9..40,500;0,9..40,600;0,9..40,700;1,9..40,400&family=JetBrains+Mono:wght@400;500;600&family=Plus+Jakarta+Sans:wght@500;600;700;800&display=swap');

:root {
  /* Surface Tokens */
  --surface-canvas: #0B0F17;
  --surface-panel: #131924;
  --surface-elevated: #1C2433;
  --surface-elevated-hover: #242E40;
  --surface-border: #2B3547;
  --surface-border-focus: #3B82F6;

  /* Brand Accents */
  --brand-primary: #2563EB;
  --brand-primary-hover: #1D4ED8;
  --brand-primary-subtle: rgba(37, 99, 235, 0.12);

  /* Semantic Accents */
  --accent-emerald: #059669;
  --accent-emerald-subtle: rgba(5, 150, 105, 0.12);
  --accent-amber: #D97706;
  --accent-amber-subtle: rgba(217, 119, 6, 0.12);
  --accent-rose: #E11D48;
  --accent-rose-subtle: rgba(225, 29, 72, 0.12);
  --accent-cyan: #0891B2;
  --accent-cyan-subtle: rgba(8, 145, 178, 0.12);

  /* Typography Colors */
  --text-primary: #F8FAFC;
  --text-secondary: #94A3B8;
  --text-muted: #64748B;
  --text-inverse: #0B0F17;

  /* Font Stacks */
  --font-display: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Radii - Deliberate Contrast */
  --radius-sharp: 2px;
  --radius-panel: 5px;
  --radius-button: 4px;
  --radius-pill: 9999px;

  /* Transitions */
  --transition-fast: 140ms ease-out;
  --shadow-panel: 0 4px 20px -2px rgba(0, 0, 0, 0.4);
  --shadow-elevated: 0 10px 30px -4px rgba(0, 0, 0, 0.6);
}

/* Base Reset & Typography */
*, *::before, *::after {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  background-color: var(--surface-canvas);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.025em;
  margin-top: 0;
}

a {
  color: var(--brand-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}
a:hover {
  color: var(--brand-primary-hover);
}

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

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

.sidebar {
  width: 250px;
  background: var(--surface-panel);
  border-right: 1px solid var(--surface-border);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  position: sticky;
  top: 0;
  height: 100vh;
  z-index: 100;
}

.sidebar-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--surface-border);
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand-logo {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.03em;
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.35rem;
}
.brand-logo span {
  color: var(--brand-primary);
}

.sidebar-nav {
  padding: 1rem 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  flex: 1;
  overflow-y: auto;
}

.nav-label {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  padding: 0.75rem 0.75rem 0.35rem;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.6rem 0.75rem;
  border-radius: var(--radius-button);
  color: var(--text-secondary);
  font-weight: 500;
  transition: all var(--transition-fast);
}

.nav-item:hover {
  background: var(--surface-elevated);
  color: var(--text-primary);
}

.nav-item.active {
  background: var(--brand-primary-subtle);
  color: var(--text-primary);
  border-left: 3px solid var(--brand-primary);
  border-top-left-radius: 0;
  border-bottom-left-radius: 0;
  padding-left: calc(0.75rem - 3px);
}

.sidebar-footer {
  padding: 1rem;
  border-top: 1px solid var(--surface-border);
  background: rgba(0, 0, 0, 0.15);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.user-profile-badge {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  min-width: 0;
}

.user-avatar {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sharp);
  background: var(--surface-elevated);
  border: 1px solid var(--surface-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.8rem;
  color: var(--brand-primary);
  flex-shrink: 0;
}

.user-info {
  min-width: 0;
}
.user-name {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.user-role {
  font-size: 0.7rem;
  color: var(--text-muted);
  text-transform: capitalize;
}

/* Main Content Area */
.main-wrapper {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.topbar {
  height: 56px;
  background: var(--surface-panel);
  border-bottom: 1px solid var(--surface-border);
  padding: 0 1.75rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 90;
}

.content-area {
  padding: 1.75rem;
  max-width: 1440px;
  margin: 0 auto;
  width: 100%;
}

/* Header & Page Title Blocks */
.page-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 1.75rem;
  gap: 1rem;
}

.page-title-group h1 {
  font-size: 1.6rem;
  margin-bottom: 0.25rem;
}
.page-subtitle {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.55rem 1rem;
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: var(--radius-button);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn-primary {
  background: var(--brand-primary);
  color: #ffffff;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}
.btn-primary:hover {
  background: var(--brand-primary-hover);
}

.btn-secondary {
  background: var(--surface-elevated);
  color: var(--text-primary);
  border-color: var(--surface-border);
}
.btn-secondary:hover {
  background: var(--surface-elevated-hover);
  border-color: #404D66;
}

.btn-danger {
  background: var(--accent-rose-subtle);
  color: #fb7185;
  border-color: rgba(225, 29, 72, 0.3);
}
.btn-danger:hover {
  background: var(--accent-rose);
  color: white;
}

.btn-sm {
  padding: 0.35rem 0.65rem;
  font-size: 0.8rem;
}

/* Cards & Panels */
.panel {
  background: var(--surface-panel);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-panel);
  box-shadow: var(--shadow-panel);
  overflow: hidden;
  margin-bottom: 1.5rem;
}

.panel-header {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--surface-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.panel-title {
  font-size: 1rem;
  margin: 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.panel-body {
  padding: 1.25rem;
}

/* Badges & Chips */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-pill);
  font-size: 0.725rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.badge-draft {
  background: var(--accent-amber-subtle);
  color: #fbbf24;
  border: 1px solid rgba(217, 119, 6, 0.3);
}
.badge-published {
  background: var(--accent-emerald-subtle);
  color: #34d399;
  border: 1px solid rgba(5, 150, 105, 0.3);
}
.badge-neutral {
  background: var(--surface-elevated);
  color: var(--text-secondary);
  border: 1px solid var(--surface-border);
}

/* Tables */
.table-responsive {
  overflow-x: auto;
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-panel);
  background: var(--surface-panel);
}

.app-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.875rem;
}

.app-table th {
  background: #0E141E;
  color: var(--text-secondary);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--surface-border);
}

.app-table td {
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--surface-border);
  color: var(--text-primary);
  vertical-align: middle;
}

.app-table tbody tr {
  transition: background var(--transition-fast);
}
.app-table tbody tr:hover {
  background: rgba(37, 99, 235, 0.04);
}

/* Forms */
.form-group {
  margin-bottom: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.form-label {
  font-size: 0.825rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.form-control {
  background: var(--surface-elevated);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-sharp);
  padding: 0.55rem 0.75rem;
  font-family: var(--font-body);
  font-size: 0.9rem;
  color: var(--text-primary);
  transition: border-color var(--transition-fast);
}

.form-control:focus {
  outline: none;
  border-color: var(--brand-primary);
  box-shadow: 0 0 0 1px var(--brand-primary);
}

.form-control-mono {
  font-family: var(--font-mono);
}

/* KPI Stat Cards */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin-bottom: 1.75rem;
}

.stat-card {
  background: var(--surface-panel);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-panel);
  padding: 1.25rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.stat-icon-wrapper {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sharp);
  background: var(--surface-elevated);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--brand-primary);
  border: 1px solid var(--surface-border);
}

.stat-info {
  display: flex;
  flex-direction: column;
}
.stat-value {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.2;
}
.stat-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  font-weight: 600;
}

/* Upload Author & Audit Badges */
.audit-author-stamp {
  font-size: 0.75rem;
  color: var(--text-muted);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  background: rgba(0, 0, 0, 0.2);
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-sharp);
  border: 1px solid rgba(43, 53, 71, 0.6);
}
.audit-author-stamp strong {
  color: #cbd5e1;
  font-weight: 600;
}

/* Tabs */
.tabs-nav {
  display: flex;
  gap: 0.25rem;
  border-bottom: 1px solid var(--surface-border);
  margin-bottom: 1.5rem;
}

.tab-btn {
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-secondary);
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.75rem 1.25rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.tab-btn:hover {
  color: var(--text-primary);
}

.tab-btn.active {
  color: var(--brand-primary);
  border-bottom-color: var(--brand-primary);
}

/* Responsive adjustments */
@media (max-width: 900px) {
  .sidebar {
    width: 64px;
  }
  .sidebar .nav-label, .sidebar .nav-item span, .sidebar .brand-logo span, .sidebar-footer .user-info {
    display: none;
  }
  .sidebar-header {
    justify-content: center;
    padding: 1rem 0.5rem;
  }
  .sidebar-nav {
    align-items: center;
  }
}