/* ==========================================================================
   Main Design System & Color Tokens (Light / Dark Mode support)
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Kanit:wght@300;400;500;600;700&family=Outfit:wght@400;500;600;700&display=swap');

:root {
  /* Font Family */
  --font-main: 'Kanit', 'Outfit', system-ui, -apple-system, sans-serif;

  /* Color Palette - Light Mode Default (Vibrant & Premium) */
  --bg-primary: #f4f6fb;
  --bg-secondary: #ffffff;
  --bg-card: #ffffff;
  --bg-glass: rgba(255, 255, 255, 0.85);
  --border-color: #e2e8f0;
  --border-hover: #cbd5e1;

  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;

  /* Brand / Accent Colors */
  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --primary-light: #eef2ff;
  --primary-glow: rgba(79, 70, 229, 0.25);

  --secondary: #0ea5e9;
  --secondary-hover: #0284c7;

  --accent-purple: #8b5cf6;
  --accent-pink: #ec4899;

  /* Status Colors */
  --status-todo-bg: #fff7ed;
  --status-todo-text: #c2410c;
  --status-todo-border: #ffedd5;

  --status-progress-bg: #eff6ff;
  --status-progress-text: #1d4ed8;
  --status-progress-border: #dbeafe;

  --status-submitted-bg: #fefce8;
  --status-submitted-text: #a16207;
  --status-submitted-border: #fef08a;

  --status-graded-bg: #f0fdf4;
  --status-graded-text: #15803d;
  --status-graded-border: #bbf7d0;

  --danger: #ef4444;
  --danger-hover: #dc2626;
  --danger-light: #fef2f2;

  --warning: #f59e0b;
  --warning-light: #fffbeb;

  --success: #10b981;
  --success-light: #ecfdf5;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -2px rgba(0, 0, 0, 0.03);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

  /* Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
}

/* Dark Mode Theme Overrides */
[data-theme="dark"] {
  --bg-primary: #0b0f17;
  --bg-secondary: #151c28;
  --bg-card: #1e293b;
  --bg-glass: rgba(30, 41, 59, 0.85);
  --border-color: #334155;
  --border-hover: #475569;

  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #64748b;

  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --primary-light: rgba(99, 102, 241, 0.15);
  --primary-glow: rgba(99, 102, 241, 0.35);

  --secondary: #38bdf8;

  --status-todo-bg: rgba(194, 65, 12, 0.2);
  --status-todo-text: #ff8c00;
  --status-todo-border: rgba(194, 65, 12, 0.4);

  --status-progress-bg: rgba(29, 78, 216, 0.2);
  --status-progress-text: #60a5fa;
  --status-progress-border: rgba(29, 78, 216, 0.4);

  --status-submitted-bg: rgba(161, 98, 7, 0.2);
  --status-submitted-text: #facc15;
  --status-submitted-border: rgba(161, 98, 7, 0.4);

  --status-graded-bg: rgba(21, 128, 61, 0.2);
  --status-graded-text: #4ade80;
  --status-graded-border: rgba(21, 128, 61, 0.4);

  --danger-light: rgba(239, 68, 68, 0.2);
  --warning-light: rgba(245, 158, 11, 0.2);
  --success-light: rgba(16, 185, 129, 0.2);

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6);
}

/* Base Styles */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-main);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  min-height: 100vh;
  transition: background-color var(--transition-normal), color var(--transition-normal);
  overflow-x: hidden;
}

a {
  color: var(--primary);
  text-decoration: none;
}

button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
}

/* App Container */
#app-root {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Utilities */
.hidden {
  display: none !important;
}

.flex {
  display: flex;
}

.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

.flex-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.gap-2 { gap: 0.5rem; }
.gap-3 { gap: 0.75rem; }
.gap-4 { gap: 1rem; }
.gap-6 { gap: 1.5rem; }

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.25rem 0.65rem;
  font-size: 0.8rem;
  font-weight: 500;
  border-radius: var(--radius-full);
}

.badge-primary {
  background-color: var(--primary-light);
  color: var(--primary);
}

.badge-todo {
  background-color: var(--status-todo-bg);
  color: var(--status-todo-text);
  border: 1px solid var(--status-todo-border);
}

.badge-progress {
  background-color: var(--status-progress-bg);
  color: var(--status-progress-text);
  border: 1px solid var(--status-progress-border);
}

.badge-submitted {
  background-color: var(--status-submitted-bg);
  color: var(--status-submitted-text);
  border: 1px solid var(--status-submitted-border);
}

.badge-graded {
  background-color: var(--status-graded-bg);
  color: var(--status-graded-text);
  border: 1px solid var(--status-graded-border);
}

.badge-danger {
  background-color: var(--danger-light);
  color: var(--danger);
}