/* ============================================================================
   MODERN DESIGN SYSTEM - IPAGE Hotel Communication Hub 2026
   ============================================================================ */

:root {
  /* ========== COLOR PALETTE ========== */
  /* Primary Colors */
  --primary-50: #f0f4ff;
  --primary-100: #e0e9ff;
  --primary-200: #c7d9ff;
  --primary-300: #a5c3ff;
  --primary-400: #7ca3ff;
  --primary-500: #5b7fff;
  --primary-600: #4557f5;
  --primary-700: #2e3ac5;
  --primary-800: #1f2899;
  --primary-900: #151b66;

  /* Secondary Colors */
  --secondary-50: #f5f3ff;
  --secondary-100: #ebe7ff;
  --secondary-200: #dcd5ff;
  --secondary-300: #c2b5ff;
  --secondary-400: #a078ff;
  --secondary-500: #8b5cf6;
  --secondary-600: #7c3aed;
  --secondary-700: #6d28d9;
  --secondary-800: #5b21b6;
  --secondary-900: #3f0f82;

  /* Semantic Colors */
  --success-50: #ecfdf5;
  --success-100: #d1fae5;
  --success-200: #a7f3d0;
  --success-500: #10b981;
  --success-600: #059669;
  --success-700: #047857;

  --warning-50: #fffbeb;
  --warning-100: #fef3c7;
  --warning-200: #fde68a;
  --warning-500: #f59e0b;
  --warning-600: #d97706;
  --warning-700: #b45309;

  --danger-50: #fef2f2;
  --danger-100: #fee2e2;
  --danger-200: #fecaca;
  --danger-500: #ef4444;
  --danger-600: #dc2626;
  --danger-700: #b91c1c;

  --info-50: #eff6ff;
  --info-100: #dbeafe;
  --info-200: #bfdbfe;
  --info-500: #3b82f6;
  --info-600: #2563eb;
  --info-700: #1d4ed8;

  /* Neutral Colors */
  --neutral-50: #fafafa;
  --neutral-100: #f5f5f5;
  --neutral-200: #e5e5e5;
  --neutral-300: #d4d4d4;
  --neutral-400: #a3a3a3;
  --neutral-500: #737373;
  --neutral-600: #525252;
  --neutral-700: #404040;
  --neutral-800: #262626;
  --neutral-900: #171717;

  /* Surface Colors */
  --surface-bg: #ffffff;
  --surface-bg-secondary: #f9fafb;
  --surface-border: #e5e7eb;
  --surface-hover: #f3f4f6;

  /* Text Colors */
  --text-primary: #111827;
  --text-secondary: #6b7280;
  --text-tertiary: #9ca3af;
  --text-inverse: #ffffff;

  /* ========== DARK MODE ========== */
  /* Will be applied with [data-theme="dark"] */

  /* ========== SPACING SYSTEM ========== */
  --space-0: 0;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* ========== TYPOGRAPHY ========== */
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
    'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
    sans-serif;
  --font-mono: 'Monaco', 'Menlo', 'Ubuntu Mono', 'Courier New', 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;

  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;

  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  /* ========== SHADOWS ========== */
  --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1),
    0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1),
    0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1),
    0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);

  /* ========== BORDER RADIUS ========== */
  --radius-none: 0;
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;

  /* ========== TRANSITIONS ========== */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 200ms ease-in-out;
  --transition-slow: 300ms ease-in-out;

  /* ========== Z-INDEX ========== */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;
}

/* ============================================================================
   DARK MODE
   ============================================================================ */
[data-theme='dark'],
[data-theme='dark'] {
  /* Surface Colors */
  --surface-bg: #1f2937;
  --surface-bg-secondary: #111827;
  --surface-border: #374151;
  --surface-hover: #2d3748;

  /* Text Colors */
  --text-primary: #f9fafb;
  --text-secondary: #d1d5db;
  --text-tertiary: #9ca3af;
}

/* ============================================================================
   SYSTEM THEME PREFERENCE
   ============================================================================ */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme='light']) {
    --surface-bg: #1f2937;
    --surface-bg-secondary: #111827;
    --surface-border: #374151;
    --surface-hover: #2d3748;
    --text-primary: #f9fafb;
    --text-secondary: #d1d5db;
    --text-tertiary: #9ca3af;
  }
}

/* ============================================================================
   GLOBAL STYLES
   ============================================================================ */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--line-height-normal);
  color: var(--text-primary);
  background-color: var(--surface-bg);
  transition: background-color var(--transition-base),
    color var(--transition-base);
}

/* ============================================================================
   TYPOGRAPHY
   ============================================================================ */
h1 {
  font-size: var(--text-4xl);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  margin-bottom: var(--space-6);
}

h2 {
  font-size: var(--text-3xl);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  margin-bottom: var(--space-4);
}

h3 {
  font-size: var(--text-2xl);
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-normal);
  margin-bottom: var(--space-3);
}

h4 {
  font-size: var(--text-xl);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-2);
}

h5 {
  font-size: var(--text-lg);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-2);
}

h6 {
  font-size: var(--text-base);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-2);
}

p {
  margin-bottom: var(--space-4);
  color: var(--text-secondary);
}

small {
  font-size: var(--text-sm);
  color: var(--text-tertiary);
}

a {
  color: var(--primary-600);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--primary-700);
}

/* ============================================================================
   SCROLLBAR STYLING
   ============================================================================ */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--surface-bg);
}

::-webkit-scrollbar-thumb {
  background: var(--neutral-300);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--neutral-400);
}

/* ============================================================================
   FOCUS VISIBLE (Accessibility)
   ============================================================================ */
:focus-visible {
  outline: 2px solid var(--primary-500);
  outline-offset: 2px;
}

button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--primary-500);
  outline-offset: 2px;
}

/* ============================================================================
   UTILITY CLASSES
   ============================================================================ */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

.truncate {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.line-clamp-2 {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.line-clamp-3 {
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}