:root {
  /* Brand */
  --color-primary: #5E17EB;
  --color-primary-dark: #4A10C4;
  --color-primary-light: #7C3FF0;
  --color-primary-surface: #F3F0FF;
  --color-primary-border: #DDD6FE;

  --color-accent: #00BF63;
  --color-accent-dark: #00994F;
  --color-accent-light: #00D96E;
  --color-accent-surface: #EDFFF6;
  --color-accent-border: #A7F3D0;

  /* Neutrals */
  --color-black: #0D0D0D;
  --color-dark: #1A1A2E;
  --color-grey-dark: #2D2D2D;
  --color-grey-mid: #6B7280;
  --color-grey-light: #9CA3AF;
  --color-grey-border: #E5E7EB;
  --color-grey-surface: #F9FAFB;
  --color-white: #FFFFFF;
  --color-surface: #FAFAFA;

  /* Semantic */
  --color-success: #00BF63;
  --color-warning: #F59E0B;
  --color-danger: #EF4444;
  --color-info: #3B82F6;
  --color-warning-surface: #FEF3C7;
  --color-warning-dark: #92400E;
  --color-warning-border: #FDE68A;
  --color-danger-surface: #FEE2E2;
  --color-danger-dark: #991B1B;
  --color-danger-border: #FECACA;
  --color-internal-note: #FFFBEB;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;

  --font-normal: 400;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;

  /* Spacing */
  --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;

  /* Layout */
  --sidebar-width: 256px;
  --topnav-height: 64px;
  --border-radius-sm: 6px;
  --border-radius: 10px;
  --border-radius-lg: 16px;
  --border-radius-xl: 24px;
  --border-radius-full: 9999px;

  /* Shadows */
  --shadow-xs: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.04);
  --shadow-lg: 0 10px 15px rgba(0,0,0,0.08), 0 4px 6px rgba(0,0,0,0.04);
  --shadow-xl: 0 20px 25px rgba(0,0,0,0.08), 0 10px 10px rgba(0,0,0,0.04);
  --shadow-purple: 0 4px 14px rgba(94,23,235,0.25);
  --shadow-green: 0 4px 14px rgba(0,191,99,0.25);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
  --transition-slow: 300ms ease;

  /* Overlays */
  --overlay-dark: rgba(13,13,13,0.55);
  --sidebar-nav-muted: rgba(255,255,255,0.55);
  --sidebar-divider: rgba(255,255,255,0.08);
  --sidebar-hover-bg: rgba(94,23,235,0.15);
  --sidebar-active-bg: rgba(94,23,235,0.25);
}

/* Buttons */
.btn-primary,
a.btn-primary {
  background: var(--color-primary);
  color: var(--color-white);
  border: none;
  border-radius: var(--border-radius);
  padding: 10px 20px;
  font-weight: var(--font-semibold);
  font-size: var(--text-sm);
  transition: background var(--transition-fast), box-shadow var(--transition-fast);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  text-decoration: none;
  line-height: 1.4;
}
.btn-primary:hover,
.btn-primary:focus,
a.btn-primary:hover {
  background: var(--color-primary-dark);
  box-shadow: var(--shadow-purple);
  color: var(--color-white);
}

.btn-accent,
a.btn-accent {
  background: var(--color-accent);
  color: var(--color-white);
  border: none;
  border-radius: var(--border-radius);
  padding: 10px 20px;
  font-weight: var(--font-semibold);
  font-size: var(--text-sm);
  transition: background var(--transition-fast), box-shadow var(--transition-fast);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  text-decoration: none;
}
.btn-accent:hover,
a.btn-accent:hover {
  background: var(--color-accent-dark);
  box-shadow: var(--shadow-green);
  color: var(--color-white);
}

.btn-outline-primary,
a.btn-outline-primary {
  background: transparent;
  color: var(--color-primary);
  border: 1.5px solid var(--color-primary);
  border-radius: var(--border-radius);
  padding: 9px 20px;
  font-weight: var(--font-semibold);
  font-size: var(--text-sm);
  transition: background var(--transition-fast), color var(--transition-fast);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  text-decoration: none;
}
.btn-outline-primary:hover,
a.btn-outline-primary:hover {
  background: var(--color-primary-surface);
  color: var(--color-primary);
}

.btn-ghost,
a.btn-ghost {
  background: transparent;
  color: var(--color-grey-dark);
  border: 1.5px solid var(--color-grey-border);
  border-radius: var(--border-radius);
  padding: 9px 20px;
  font-weight: var(--font-medium);
  font-size: var(--text-sm);
  transition: background var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  text-decoration: none;
}
.btn-ghost:hover,
a.btn-ghost:hover {
  background: var(--color-grey-surface);
  border-color: var(--color-grey-light);
  color: var(--color-black);
}

.btn-lg-custom {
  padding: 14px 24px;
  font-size: var(--text-base);
  min-height: 48px;
}

.btn-sm-custom {
  padding: 6px 14px;
  font-size: var(--text-xs);
}

.btn-icon {
  width: 36px;
  height: 36px;
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--border-radius-sm);
  background: transparent;
  border: 1px solid var(--color-grey-border);
  color: var(--color-grey-mid);
  transition: all var(--transition-fast);
  cursor: pointer;
}
.btn-icon:hover {
  background: var(--color-grey-surface);
  color: var(--color-primary);
  border-color: var(--color-primary-border);
}

/* Cards */
.card-base {
  background: var(--color-white);
  border-radius: var(--border-radius-lg);
  border: 1px solid var(--color-grey-border);
  box-shadow: var(--shadow-sm);
  padding: var(--space-6);
  transition: box-shadow var(--transition-base);
}
.card-base:hover {
  box-shadow: var(--shadow-md);
}

.card-stat {
  background: var(--color-white);
  border-radius: var(--border-radius-lg);
  border: 1px solid var(--color-grey-border);
  padding: var(--space-6);
  position: relative;
  overflow: hidden;
  height: 100%;
}
.card-stat::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--color-primary);
  border-radius: var(--border-radius) 0 0 var(--border-radius);
}
.card-stat.accent::before { background: var(--color-accent); }
.card-stat.warning::before { background: var(--color-warning); }
.card-stat.danger::before { background: var(--color-danger); }
.card-stat.dark::before { background: var(--color-dark); }

.stat-number {
  font-size: var(--text-3xl);
  font-weight: var(--font-bold);
  color: var(--color-black);
  line-height: 1;
}
.stat-label {
  font-size: var(--text-sm);
  color: var(--color-grey-mid);
  font-weight: var(--font-medium);
  margin-top: var(--space-1);
}
.stat-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--border-radius);
  background: var(--color-primary-surface);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  font-size: 20px;
  flex-shrink: 0;
}
.stat-icon.accent {
  background: var(--color-accent-surface);
  color: var(--color-accent);
}
.stat-icon.warning {
  background: var(--color-warning-surface);
  color: var(--color-warning);
}
.stat-icon.dark {
  background: var(--color-grey-surface);
  color: var(--color-dark);
}

/* Badges */
.badge-primary,
.badge-accent,
.badge-warning,
.badge-danger,
.badge-grey,
.badge-dark,
.badge-info {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  border-radius: var(--border-radius-full);
  padding: 3px 10px;
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  line-height: 1.4;
  text-transform: capitalize;
}
.badge-primary { background: var(--color-primary-surface); color: var(--color-primary); border: 1px solid var(--color-primary-border); }
.badge-accent { background: var(--color-accent-surface); color: var(--color-accent-dark); border: 1px solid var(--color-accent-border); }
.badge-warning { background: var(--color-warning-surface); color: var(--color-warning-dark); border: 1px solid var(--color-warning-border); }
.badge-danger { background: var(--color-danger-surface); color: var(--color-danger-dark); border: 1px solid var(--color-danger-border); }
.badge-grey { background: var(--color-grey-surface); color: var(--color-grey-mid); border: 1px solid var(--color-grey-border); }
.badge-dark { background: var(--color-dark); color: var(--color-white); border: none; }
.badge-info { background: var(--color-primary-surface); color: var(--color-info); border: 1px solid var(--color-primary-border); }

/* Forms */
.form-label-custom {
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--color-grey-dark);
  margin-bottom: var(--space-1);
  display: block;
}
.form-input,
.form-select-custom {
  width: 100%;
  padding: 10px 14px;
  border: 1.5px solid var(--color-grey-border);
  border-radius: var(--border-radius);
  font-size: var(--text-sm);
  color: var(--color-black);
  background: var(--color-white);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  outline: none;
}
.form-input:focus,
.form-select-custom:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(94,23,235,0.12);
}
.form-input::placeholder { color: var(--color-grey-light); }

/* Tables */
.table-custom {
  width: 100%;
  border-collapse: collapse;
}
.table-custom thead th {
  background: var(--color-grey-surface);
  color: var(--color-grey-mid);
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 10px 16px;
  border-bottom: 1px solid var(--color-grey-border);
  white-space: nowrap;
}
.table-custom tbody td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--color-grey-border);
  font-size: var(--text-sm);
  color: var(--color-grey-dark);
  vertical-align: middle;
}
.table-custom tbody tr:hover { background: var(--color-grey-surface); }
.table-custom tbody tr:last-child td { border-bottom: none; }
.table-custom a {
  color: var(--color-primary);
  text-decoration: none;
  font-weight: var(--font-medium);
}
.table-custom a:hover { text-decoration: underline; }

/* Progress */
.progress-custom {
  height: 6px;
  background: var(--color-grey-border);
  border-radius: var(--border-radius-full);
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary), var(--color-primary-light));
  border-radius: var(--border-radius-full);
  transition: width var(--transition-slow);
}
.progress-fill.accent {
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-light));
}

/* Empty states */
.empty-state {
  text-align: center;
  padding: var(--space-16) var(--space-8);
  color: var(--color-grey-mid);
}
.empty-state-icon {
  font-size: 48px;
  color: var(--color-grey-border);
  margin-bottom: var(--space-4);
}
.empty-state-title {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  color: var(--color-grey-dark);
  margin-bottom: var(--space-2);
}
.empty-state-text {
  font-size: var(--text-sm);
  color: var(--color-grey-mid);
  margin-bottom: var(--space-6);
}

/* Alerts */
.alert-custom {
  padding: 12px 16px;
  border-radius: var(--border-radius);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}
.alert-custom.alert-dismissing {
  opacity: 0;
  transform: translateY(-8px);
}
.alert-success { background: var(--color-accent-surface); color: var(--color-accent-dark); border: 1px solid var(--color-accent-border); }
.alert-danger { background: var(--color-danger-surface); color: var(--color-danger-dark); border: 1px solid var(--color-danger-border); }
.alert-warning { background: var(--color-warning-surface); color: var(--color-warning-dark); border: 1px solid var(--color-warning-border); }
.alert-info { background: var(--color-primary-surface); color: var(--color-primary); border: 1px solid var(--color-primary-border); }

/* Section & page headers */
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-6);
  flex-wrap: wrap;
  gap: var(--space-4);
}
.section-title {
  font-size: var(--text-xl);
  font-weight: var(--font-bold);
  color: var(--color-black);
}
.section-subtitle {
  font-size: var(--text-sm);
  color: var(--color-grey-mid);
  margin-top: var(--space-1);
}

.page-header {
  margin-bottom: var(--space-8);
  padding-bottom: var(--space-6);
  border-bottom: 1px solid var(--color-grey-border);
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-4);
}
.page-title {
  font-size: var(--text-2xl);
  font-weight: var(--font-bold);
  color: var(--color-black);
  margin: 0;
}
.page-subtitle {
  font-size: var(--text-sm);
  color: var(--color-grey-mid);
  margin-top: var(--space-1);
}
.breadcrumb-custom {
  font-size: var(--text-xs);
  color: var(--color-grey-mid);
  margin-bottom: var(--space-2);
}
.breadcrumb-custom a {
  color: var(--color-primary);
  text-decoration: none;
}
.breadcrumb-custom a:hover { text-decoration: underline; }

/* Avatars */
.avatar-circle {
  width: 40px;
  height: 40px;
  border-radius: var(--border-radius-full);
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  color: var(--color-white);
  font-weight: var(--font-semibold);
  font-size: var(--text-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  overflow: hidden;
}
.avatar-circle img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.avatar-circle.sm { width: 32px; height: 32px; font-size: var(--text-xs); }
.avatar-circle.lg { width: 48px; height: 48px; font-size: var(--text-base); }

/* Utility */
.text-primary-brand { color: var(--color-primary); }
.text-accent-brand { color: var(--color-accent); }
.text-muted-brand { color: var(--color-grey-mid); }
.bg-primary-surface { background: var(--color-primary-surface); }
.bg-grey-surface { background: var(--color-grey-surface); }

.divider-or {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  color: var(--color-grey-mid);
  font-size: var(--text-sm);
  margin: var(--space-6) 0;
}
.divider-or::before,
.divider-or::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--color-grey-border);
}

.table-responsive-custom {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}