/* =============================================
   PORTAL NHA KHOA - DESIGN SYSTEM
   Light Mode Default + Dark Mode Toggle
   ============================================= */

/* --- Google Font --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

/* --- CSS Custom Properties --- */
:root {
  /* Primary palette - Medical Teal + Navy */
  --primary-50: #ecfeff;
  --primary-100: #cffafe;
  --primary-200: #a5f3fc;
  --primary-300: #67e8f9;
  --primary-400: #22d3ee;
  --primary-500: #06b6d4;
  --primary-600: #0891b2;
  --primary-700: #0e7490;
  --primary-800: #155e75;
  --primary-900: #164e63;

  /* Accent - Blue */
  --accent-400: #60a5fa;
  --accent-500: #3b82f6;
  --accent-600: #2563eb;

  /* Success */
  --success-400: #4ade80;
  --success-500: #22c55e;
  --success-600: #16a34a;

  /* Warning */
  --warning-400: #facc15;
  --warning-500: #eab308;
  --warning-600: #ca8a04;

  /* Danger */
  --danger-400: #f87171;
  --danger-500: #ef4444;
  --danger-600: #dc2626;

  /* Orange */
  --orange-400: #fb923c;
  --orange-500: #f97316;
  --orange-600: #ea580c;

  /* Purple */
  --purple-400: #c084fc;
  --purple-500: #a855f7;
  --purple-600: #9333ea;

  /* ===== LIGHT MODE (Default) ===== */
  --bg-body: #f0f4f8;
  --bg-sidebar: #ffffff;
  --bg-card: rgba(255, 255, 255, 0.9);
  --bg-card-solid: #ffffff;
  --bg-card-hover: rgba(241, 245, 249, 0.9);
  --bg-input: #ffffff;
  --bg-modal: rgba(255, 255, 255, 0.98);
  --bg-tooltip: #1e293b;
  --bg-dropdown: #ffffff;
  --bg-table-stripe: rgba(248, 250, 252, 0.8);
  --bg-table-hover: rgba(6, 182, 212, 0.06);

  /* Borders */
  --border-primary: rgba(148, 163, 184, 0.25);
  --border-hover: rgba(6, 182, 212, 0.4);
  --border-focus: rgba(6, 182, 212, 0.6);
  --border-input: rgba(148, 163, 184, 0.35);

  /* Text */
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --text-tertiary: #94a3b8;
  --text-inverse: #f1f5f9;
  --text-link: #0891b2;

  /* Glassmorphism */
  --glass-bg: rgba(255, 255, 255, 0.7);
  --glass-border: rgba(148, 163, 184, 0.2);
  --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
  --glass-blur: blur(16px);

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.1);
  --shadow-xl: 0 20px 60px rgba(0,0,0,0.12);
  --shadow-glow: 0 0 30px rgba(6, 182, 212, 0.1);
  --shadow-glow-sm: 0 0 15px rgba(6, 182, 212, 0.06);

  /* Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Spacing */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --text-xs: 0.75rem;
  --text-sm: 0.8125rem;
  --text-base: 0.875rem;
  --text-lg: 1rem;
  --text-xl: 1.125rem;
  --text-2xl: 1.375rem;
  --text-3xl: 1.75rem;
  --text-4xl: 2.25rem;

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Layout */
  --sidebar-width: 260px;
  --sidebar-collapsed: 68px;
  --header-height: 60px;
  --content-max-width: 1600px;

  /* Z-index */
  --z-sidebar: 100;
  --z-header: 200;
  --z-dropdown: 300;
  --z-modal-backdrop: 400;
  --z-modal: 500;
  --z-toast: 600;
  --z-tooltip: 700;
}

/* ===== DARK MODE ===== */
[data-theme="dark"] {
  --bg-body: #0a0e1a;
  --bg-sidebar: #0d1224;
  --bg-card: rgba(15, 23, 42, 0.8);
  --bg-card-solid: #0f172a;
  --bg-card-hover: rgba(30, 41, 59, 0.8);
  --bg-input: rgba(15, 23, 42, 0.6);
  --bg-modal: rgba(15, 23, 42, 0.95);
  --bg-tooltip: #1e293b;
  --bg-dropdown: #131c31;
  --bg-table-stripe: rgba(30, 41, 59, 0.3);
  --bg-table-hover: rgba(6, 182, 212, 0.08);

  --border-primary: rgba(148, 163, 184, 0.12);
  --border-hover: rgba(6, 182, 212, 0.3);
  --border-focus: rgba(6, 182, 212, 0.6);
  --border-input: rgba(148, 163, 184, 0.2);

  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-tertiary: #64748b;
  --text-inverse: #0f172a;
  --text-link: #22d3ee;

  --glass-bg: rgba(15, 23, 42, 0.6);
  --glass-border: rgba(148, 163, 184, 0.1);
  --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.3);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.4);
  --shadow-xl: 0 20px 60px rgba(0,0,0,0.5);
  --shadow-glow: 0 0 30px rgba(6, 182, 212, 0.15);
  --shadow-glow-sm: 0 0 15px rgba(6, 182, 212, 0.1);
}

/* --- Reset & Base --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family);
  font-size: var(--text-base);
  color: var(--text-primary);
  background: var(--bg-body);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

/* Animated background */
body::before {
  content: '';
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(6, 182, 212, 0.04) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(59, 130, 246, 0.03) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 80%, rgba(168, 85, 247, 0.02) 0%, transparent 50%);
  pointer-events: none;
  z-index: 0;
}
[data-theme="dark"] body::before {
  background:
    radial-gradient(ellipse at 20% 50%, rgba(6, 182, 212, 0.06) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(59, 130, 246, 0.05) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 80%, rgba(168, 85, 247, 0.04) 0%, transparent 50%);
}

/* Theme toggle button */
.theme-toggle {
  background: none;
  border: 1px solid var(--border-primary);
  color: var(--text-secondary);
  width: 36px; height: 36px;
  border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  font-size: 18px;
}
.theme-toggle:hover { background: var(--bg-card-hover); color: var(--text-primary); border-color: var(--border-hover); }

a { color: var(--text-link); text-decoration: none; transition: color var(--transition-fast); }
a:hover { color: var(--primary-300); }

img { max-width: 100%; height: auto; }

/* --- Scrollbar --- */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(148,163,184,0.2); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(148,163,184,0.35); }

/* --- Selection --- */
::selection { background: rgba(6, 182, 212, 0.2); color: var(--text-primary); }
[data-theme="dark"] ::selection { background: rgba(6, 182, 212, 0.3); }

/* --- Utilities --- */
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); }
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-sm { font-size: var(--text-sm); }
.text-xs { font-size: var(--text-xs); }
.text-lg { font-size: var(--text-lg); }
.text-muted { color: var(--text-secondary); }
.text-success { color: var(--success-500); }
.text-danger { color: var(--danger-500); }
.text-warning { color: var(--warning-500); }
.fw-500 { font-weight: 500; }
.fw-600 { font-weight: 600; }
.fw-700 { font-weight: 700; }
.mt-2 { margin-top: var(--space-2); }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mb-2 { margin-bottom: var(--space-2); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.flex-1 { flex: 1; }
.grid { display: grid; }
.hidden { display: none !important; }
.truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.relative { position: relative; }

/* --- Animations --- */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes slideInLeft {
  from { opacity: 0; transform: translateX(-20px); }
  to { opacity: 1; transform: translateX(0); }
}
@keyframes slideInRight {
  from { opacity: 0; transform: translateX(20px); }
  to { opacity: 1; transform: translateX(0); }
}
@keyframes scaleIn {
  from { opacity: 0; transform: scale(0.95); }
  to { opacity: 1; transform: scale(1); }
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}
@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}
@keyframes spin {
  to { transform: rotate(360deg); }
}
@keyframes slideDown {
  from { opacity: 0; transform: translateY(-10px); max-height: 0; }
  to { opacity: 1; transform: translateY(0); max-height: 500px; }
}

.animate-fade { animation: fadeIn 0.3s ease-out; }
.animate-fade-up { animation: fadeInUp 0.4s ease-out; }
.animate-slide-left { animation: slideInLeft 0.3s ease-out; }
.animate-slide-right { animation: slideInRight 0.3s ease-out; }
.animate-scale { animation: scaleIn 0.25s ease-out; }
.animate-pulse { animation: pulse 2s infinite; }

/* Stagger animation children */
.stagger > * { animation: fadeInUp 0.4s ease-out backwards; }
.stagger > *:nth-child(1) { animation-delay: 0.05s; }
.stagger > *:nth-child(2) { animation-delay: 0.1s; }
.stagger > *:nth-child(3) { animation-delay: 0.15s; }
.stagger > *:nth-child(4) { animation-delay: 0.2s; }
.stagger > *:nth-child(5) { animation-delay: 0.25s; }
.stagger > *:nth-child(6) { animation-delay: 0.3s; }

/* Skeleton loading */
.skeleton {
  background: linear-gradient(90deg, var(--bg-card) 25%, rgba(148,163,184,0.08) 50%, var(--bg-card) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-sm);
}

/* Spinner */
.spinner {
  width: 24px; height: 24px;
  border: 3px solid var(--border-primary);
  border-top-color: var(--primary-500);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}
.spinner-lg { width: 40px; height: 40px; border-width: 4px; }