/* ========================================
   DESIGN TOKENS & UTILITY CLASSES
   TMS Timetable Management System
   Version: 1.0
   ======================================== */

/* ========================================
   CSS CUSTOM PROPERTIES (VARIABLES)
   ======================================== */

:root {
  /* ===== COLOR PALETTE ===== */
  
  /* Primary Colors */
  --color-primary: #2575fc;
  --color-primary-light: #4a90fc;
  --color-primary-dark: #1a5dd9;
  --color-primary-gradient: linear-gradient(135deg, #6a11cb 0%, #2575fc 100%);
  
  /* Secondary Colors */
  --color-secondary: #6a11cb;
  --color-secondary-light: #8b3de0;
  --color-secondary-dark: #5209a8;
  
  /* Accent Colors */
  --color-accent-blue: #0dcaf0;
  --color-accent-purple: #7c3aed;
  --color-accent-pink: #e91e63;
  --color-accent-gold: #ffd700;
  
  /* Success, Warning, Danger, Info */
  --color-success: #28a745;
  --color-success-light: #34ce57;
  --color-success-dark: #1e7e34;
  --color-success-gradient: linear-gradient(135deg, #28a745 0%, #20c997 100%);
  
  --color-warning: #ffc107;
  --color-warning-light: #ffd454;
  --color-warning-dark: #e0a800;
  
  --color-danger: #dc3545;
  --color-danger-light: #e4606d;
  --color-danger-dark: #bd2130;
  
  --color-info: #0dcaf0;
  --color-info-light: #3dd5f3;
  --color-info-dark: #0aa2c0;
  
  /* Neutral Colors */
  --color-white: #ffffff;
  --color-black: #000000;
  --color-gray-100: #f8f9fa;
  --color-gray-200: #e9ecef;
  --color-gray-300: #dee2e6;
  --color-gray-400: #ced4da;
  --color-gray-500: #adb5bd;
  --color-gray-600: #6c757d;
  --color-gray-700: #495057;
  --color-gray-800: #343a40;
  --color-gray-900: #212529;
  
  /* Background Colors */
  --color-bg-primary: #ffffff;
  --color-bg-secondary: #f8f9fa;
  --color-bg-tertiary: #e9ecef;
  --color-bg-gradient: linear-gradient(to right, #e0eafc, #cfdef3);
  --color-bg-dark: #343a40;
  
  /* Text Colors */
  --color-text-primary: #333333;
  --color-text-secondary: #6c757d;
  --color-text-tertiary: #adb5bd;
  --color-text-light: #ffffff;
  --color-text-muted: #868e96;
  
  /* Border Colors */
  --color-border-light: #e9ecef;
  --color-border-medium: #dee2e6;
  --color-border-dark: #ced4da;
  
  /* ===== SPACING SCALE ===== */
  --spacing-0: 0;
  --spacing-1: 0.25rem;    /* 4px */
  --spacing-2: 0.5rem;     /* 8px */
  --spacing-3: 0.75rem;    /* 12px */
  --spacing-4: 1rem;       /* 16px */
  --spacing-5: 1.25rem;    /* 20px */
  --spacing-6: 1.5rem;     /* 24px */
  --spacing-7: 1.75rem;    /* 28px */
  --spacing-8: 2rem;       /* 32px */
  --spacing-10: 2.5rem;    /* 40px */
  --spacing-12: 3rem;      /* 48px */
  --spacing-16: 4rem;      /* 64px */
  --spacing-20: 5rem;      /* 80px */
  --spacing-24: 6rem;      /* 96px */
  
  /* ===== TYPOGRAPHY ===== */
  
  /* Font Families */
  --font-primary: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  --font-monospace: 'Courier New', Courier, monospace;
  
  /* Font Sizes */
  --font-size-xs: 0.75rem;     /* 12px */
  --font-size-sm: 0.875rem;    /* 14px */
  --font-size-base: 1rem;      /* 16px */
  --font-size-lg: 1.125rem;    /* 18px */
  --font-size-xl: 1.25rem;     /* 20px */
  --font-size-2xl: 1.5rem;     /* 24px */
  --font-size-3xl: 1.875rem;   /* 30px */
  --font-size-4xl: 2.25rem;    /* 36px */
  --font-size-5xl: 3rem;       /* 48px */
  
  /* Font Weights */
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-extrabold: 800;
  
  /* Line Heights */
  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;
  --line-height-loose: 2;
  
  /* Letter Spacing */
  --letter-spacing-tight: -0.025em;
  --letter-spacing-normal: 0;
  --letter-spacing-wide: 0.025em;
  --letter-spacing-wider: 0.05em;
  --letter-spacing-widest: 0.1em;
  
  /* ===== 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);
  --shadow-inner: inset 0 2px 4px 0 rgba(0, 0, 0, 0.06);
  --shadow-none: none;
  
  /* Colored Shadows */
  --shadow-primary: 0 4px 12px rgba(37, 117, 252, 0.15);
  --shadow-success: 0 4px 12px rgba(40, 167, 69, 0.15);
  --shadow-warning: 0 4px 12px rgba(255, 193, 7, 0.15);
  --shadow-danger: 0 4px 12px rgba(220, 53, 69, 0.15);
  
  /* ===== BORDER RADIUS ===== */
  --radius-none: 0;
  --radius-sm: 0.25rem;    /* 4px */
  --radius-md: 0.5rem;     /* 8px */
  --radius-lg: 0.75rem;    /* 12px */
  --radius-xl: 1rem;       /* 16px */
  --radius-2xl: 1.5rem;    /* 24px */
  --radius-3xl: 2rem;      /* 32px */
  --radius-full: 9999px;   /* Fully rounded */
  
  /* ===== TRANSITIONS ===== */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 300ms ease-in-out;
  --transition-slow: 500ms ease-in-out;
  
  /* Easing Functions */
  --ease-linear: linear;
  --ease-in: cubic-bezier(0.4, 0, 1, 1);
  --ease-out: cubic-bezier(0, 0, 0.2, 1);
  --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
  
  /* ===== Z-INDEX SCALE ===== */
  --z-index-dropdown: 1000;
  --z-index-sticky: 1020;
  --z-index-fixed: 1030;
  --z-index-modal-backdrop: 1040;
  --z-index-modal: 1050;
  --z-index-popover: 1060;
  --z-index-tooltip: 1070;
  
  /* ===== BREAKPOINTS (for reference in JS) ===== */
  --breakpoint-xs: 360px;
  --breakpoint-sm: 576px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 992px;
  --breakpoint-xl: 1200px;
  --breakpoint-xxl: 1400px;
  
  /* ===== COMPONENT SPECIFIC ===== */
  
  /* Sidebar */
  --sidebar-width: 260px;
  --sidebar-bg: var(--color-primary-gradient);
  --sidebar-text: var(--color-white);
  
  /* Header Heights */
  --header-height: 60px;
  --header-mobile-height: 50px;
  
  /* Button Sizes */
  --btn-height-sm: 38px;
  --btn-height-md: 44px;
  --btn-height-lg: 48px;
  
  /* Input Sizes */
  --input-height-sm: 38px;
  --input-height-md: 45px;
  --input-height-lg: 48px;
  
  /* Table */
  --table-header-bg: var(--color-gray-800);
  --table-header-text: var(--color-white);
  --table-border: var(--color-border-medium);
  --table-hover-bg: var(--color-gray-100);
  
  /* Modal */
  --modal-header-bg: var(--color-primary-gradient);
  --modal-header-text: var(--color-white);
  --modal-backdrop: rgba(0, 0, 0, 0.5);
}

/* Dark mode support (future) */
@media (prefers-color-scheme: dark) {
  :root {
    --color-bg-primary: #1a1a1a;
    --color-bg-secondary: #2d2d2d;
    --color-text-primary: #e9ecef;
    --color-text-secondary: #adb5bd;
  }
}

/* ========================================
   UTILITY CLASSES
   ======================================== */

/* ===== SPACING UTILITIES ===== */

/* Margin */
.m-0 { margin: var(--spacing-0) !important; }
.m-1 { margin: var(--spacing-1) !important; }
.m-2 { margin: var(--spacing-2) !important; }
.m-3 { margin: var(--spacing-3) !important; }
.m-4 { margin: var(--spacing-4) !important; }
.m-5 { margin: var(--spacing-5) !important; }
.m-6 { margin: var(--spacing-6) !important; }
.m-8 { margin: var(--spacing-8) !important; }
.m-auto { margin: auto !important; }

/* Margin Top */
.mt-0 { margin-top: var(--spacing-0) !important; }
.mt-1 { margin-top: var(--spacing-1) !important; }
.mt-2 { margin-top: var(--spacing-2) !important; }
.mt-3 { margin-top: var(--spacing-3) !important; }
.mt-4 { margin-top: var(--spacing-4) !important; }
.mt-5 { margin-top: var(--spacing-5) !important; }
.mt-6 { margin-top: var(--spacing-6) !important; }
.mt-8 { margin-top: var(--spacing-8) !important; }

/* Margin Bottom */
.mb-0 { margin-bottom: var(--spacing-0) !important; }
.mb-1 { margin-bottom: var(--spacing-1) !important; }
.mb-2 { margin-bottom: var(--spacing-2) !important; }
.mb-3 { margin-bottom: var(--spacing-3) !important; }
.mb-4 { margin-bottom: var(--spacing-4) !important; }
.mb-5 { margin-bottom: var(--spacing-5) !important; }
.mb-6 { margin-bottom: var(--spacing-6) !important; }
.mb-8 { margin-bottom: var(--spacing-8) !important; }

/* Margin Left/Right */
.ml-0 { margin-left: var(--spacing-0) !important; }
.ml-2 { margin-left: var(--spacing-2) !important; }
.ml-4 { margin-left: var(--spacing-4) !important; }
.mr-0 { margin-right: var(--spacing-0) !important; }
.mr-2 { margin-right: var(--spacing-2) !important; }
.mr-4 { margin-right: var(--spacing-4) !important; }

/* Margin X/Y Axis */
.mx-auto { margin-left: auto !important; margin-right: auto !important; }
.my-2 { margin-top: var(--spacing-2) !important; margin-bottom: var(--spacing-2) !important; }
.my-4 { margin-top: var(--spacing-4) !important; margin-bottom: var(--spacing-4) !important; }
.my-6 { margin-top: var(--spacing-6) !important; margin-bottom: var(--spacing-6) !important; }

/* Padding */
.p-0 { padding: var(--spacing-0) !important; }
.p-1 { padding: var(--spacing-1) !important; }
.p-2 { padding: var(--spacing-2) !important; }
.p-3 { padding: var(--spacing-3) !important; }
.p-4 { padding: var(--spacing-4) !important; }
.p-5 { padding: var(--spacing-5) !important; }
.p-6 { padding: var(--spacing-6) !important; }
.p-8 { padding: var(--spacing-8) !important; }

/* Padding Top/Bottom */
.pt-4 { padding-top: var(--spacing-4) !important; }
.pt-6 { padding-top: var(--spacing-6) !important; }
.pb-4 { padding-bottom: var(--spacing-4) !important; }
.pb-6 { padding-bottom: var(--spacing-6) !important; }

/* Padding X/Y Axis */
.px-2 { padding-left: var(--spacing-2) !important; padding-right: var(--spacing-2) !important; }
.px-4 { padding-left: var(--spacing-4) !important; padding-right: var(--spacing-4) !important; }
.py-2 { padding-top: var(--spacing-2) !important; padding-bottom: var(--spacing-2) !important; }
.py-4 { padding-top: var(--spacing-4) !important; padding-bottom: var(--spacing-4) !important; }

/* Gap (for Flexbox/Grid) */
.gap-1 { gap: var(--spacing-1) !important; }
.gap-2 { gap: var(--spacing-2) !important; }
.gap-3 { gap: var(--spacing-3) !important; }
.gap-4 { gap: var(--spacing-4) !important; }

/* ===== TYPOGRAPHY UTILITIES ===== */

/* Font Sizes */
.text-xs { font-size: var(--font-size-xs) !important; }
.text-sm { font-size: var(--font-size-sm) !important; }
.text-base { font-size: var(--font-size-base) !important; }
.text-lg { font-size: var(--font-size-lg) !important; }
.text-xl { font-size: var(--font-size-xl) !important; }
.text-2xl { font-size: var(--font-size-2xl) !important; }
.text-3xl { font-size: var(--font-size-3xl) !important; }

/* Font Weights */
.font-light { font-weight: var(--font-weight-light) !important; }
.font-normal { font-weight: var(--font-weight-normal) !important; }
.font-medium { font-weight: var(--font-weight-medium) !important; }
.font-semibold { font-weight: var(--font-weight-semibold) !important; }
.font-bold { font-weight: var(--font-weight-bold) !important; }

/* Text Alignment */
.text-left { text-align: left !important; }
.text-center { text-align: center !important; }
.text-right { text-align: right !important; }
.text-justify { text-align: justify !important; }

/* Text Transform */
.text-uppercase { text-transform: uppercase !important; }
.text-lowercase { text-transform: lowercase !important; }
.text-capitalize { text-transform: capitalize !important; }

/* Text Decoration */
.text-underline { text-decoration: underline !important; }
.text-no-underline { text-decoration: none !important; }

/* Text Colors */
.text-primary { color: var(--color-primary) !important; }
.text-secondary { color: var(--color-text-secondary) !important; }
.text-success { color: var(--color-success) !important; }
.text-danger { color: var(--color-danger) !important; }
.text-warning { color: var(--color-warning) !important; }
.text-info { color: var(--color-info) !important; }
.text-muted { color: var(--color-text-muted) !important; }
.text-white { color: var(--color-white) !important; }
.text-dark { color: var(--color-text-primary) !important; }

/* Line Height */
.leading-tight { line-height: var(--line-height-tight) !important; }
.leading-normal { line-height: var(--line-height-normal) !important; }
.leading-relaxed { line-height: var(--line-height-relaxed) !important; }

/* ===== DISPLAY UTILITIES ===== */
.d-none { display: none !important; }
.d-block { display: block !important; }
.d-inline { display: inline !important; }
.d-inline-block { display: inline-block !important; }
.d-flex { display: flex !important; }
.d-inline-flex { display: inline-flex !important; }
.d-grid { display: grid !important; }

/* ===== FLEXBOX UTILITIES ===== */

/* Flex Direction */
.flex-row { flex-direction: row !important; }
.flex-column { flex-direction: column !important; }
.flex-row-reverse { flex-direction: row-reverse !important; }
.flex-column-reverse { flex-direction: column-reverse !important; }

/* Flex Wrap */
.flex-wrap { flex-wrap: wrap !important; }
.flex-nowrap { flex-wrap: nowrap !important; }

/* Justify Content */
.justify-start { justify-content: flex-start !important; }
.justify-center { justify-content: center !important; }
.justify-end { justify-content: flex-end !important; }
.justify-between { justify-content: space-between !important; }
.justify-around { justify-content: space-around !important; }
.justify-evenly { justify-content: space-evenly !important; }

/* Align Items */
.items-start { align-items: flex-start !important; }
.items-center { align-items: center !important; }
.items-end { align-items: flex-end !important; }
.items-stretch { align-items: stretch !important; }
.items-baseline { align-items: baseline !important; }

/* Align Self */
.self-start { align-self: flex-start !important; }
.self-center { align-self: center !important; }
.self-end { align-self: flex-end !important; }

/* Flex Grow/Shrink */
.flex-grow-0 { flex-grow: 0 !important; }
.flex-grow-1 { flex-grow: 1 !important; }
.flex-shrink-0 { flex-shrink: 0 !important; }
.flex-shrink-1 { flex-shrink: 1 !important; }

/* ===== BACKGROUND UTILITIES ===== */
.bg-primary { background-color: var(--color-primary) !important; }
.bg-secondary { background-color: var(--color-secondary) !important; }
.bg-success { background-color: var(--color-success) !important; }
.bg-danger { background-color: var(--color-danger) !important; }
.bg-warning { background-color: var(--color-warning) !important; }
.bg-info { background-color: var(--color-info) !important; }
.bg-white { background-color: var(--color-white) !important; }
.bg-gray-100 { background-color: var(--color-gray-100) !important; }
.bg-gray-200 { background-color: var(--color-gray-200) !important; }
.bg-transparent { background-color: transparent !important; }

/* Gradient Backgrounds */
.bg-gradient-primary { background: var(--color-primary-gradient) !important; }
.bg-gradient-success { background: var(--color-success-gradient) !important; }

/* ===== BORDER UTILITIES ===== */
.border { border: 1px solid var(--color-border-medium) !important; }
.border-0 { border: 0 !important; }
.border-top { border-top: 1px solid var(--color-border-medium) !important; }
.border-bottom { border-bottom: 1px solid var(--color-border-medium) !important; }
.border-left { border-left: 1px solid var(--color-border-medium) !important; }
.border-right { border-right: 1px solid var(--color-border-medium) !important; }

/* Border Colors */
.border-primary { border-color: var(--color-primary) !important; }
.border-success { border-color: var(--color-success) !important; }
.border-danger { border-color: var(--color-danger) !important; }
.border-light { border-color: var(--color-border-light) !important; }

/* Border Radius */
.rounded-none { border-radius: var(--radius-none) !important; }
.rounded-sm { border-radius: var(--radius-sm) !important; }
.rounded { border-radius: var(--radius-md) !important; }
.rounded-lg { border-radius: var(--radius-lg) !important; }
.rounded-xl { border-radius: var(--radius-xl) !important; }
.rounded-full { border-radius: var(--radius-full) !important; }

/* ===== SHADOW UTILITIES ===== */
.shadow-none { box-shadow: var(--shadow-none) !important; }
.shadow-sm { box-shadow: var(--shadow-sm) !important; }
.shadow { box-shadow: var(--shadow-md) !important; }
.shadow-lg { box-shadow: var(--shadow-lg) !important; }
.shadow-xl { box-shadow: var(--shadow-xl) !important; }
.shadow-primary { box-shadow: var(--shadow-primary) !important; }

/* ===== POSITION UTILITIES ===== */
.position-static { position: static !important; }
.position-relative { position: relative !important; }
.position-absolute { position: absolute !important; }
.position-fixed { position: fixed !important; }
.position-sticky { position: sticky !important; }

/* ===== WIDTH & HEIGHT UTILITIES ===== */
.w-25 { width: 25% !important; }
.w-50 { width: 50% !important; }
.w-75 { width: 75% !important; }
.w-100 { width: 100% !important; }
.w-auto { width: auto !important; }

.h-25 { height: 25% !important; }
.h-50 { height: 50% !important; }
.h-75 { height: 75% !important; }
.h-100 { height: 100% !important; }
.h-auto { height: auto !important; }

/* Min/Max Width */
.min-w-0 { min-width: 0 !important; }
.max-w-full { max-width: 100% !important; }

/* ===== OVERFLOW UTILITIES ===== */
.overflow-auto { overflow: auto !important; }
.overflow-hidden { overflow: hidden !important; }
.overflow-visible { overflow: visible !important; }
.overflow-scroll { overflow: scroll !important; }
.overflow-x-auto { overflow-x: auto !important; }
.overflow-y-auto { overflow-y: auto !important; }

/* ===== OPACITY UTILITIES ===== */
.opacity-0 { opacity: 0 !important; }
.opacity-25 { opacity: 0.25 !important; }
.opacity-50 { opacity: 0.5 !important; }
.opacity-75 { opacity: 0.75 !important; }
.opacity-100 { opacity: 1 !important; }

/* ===== CURSOR UTILITIES ===== */
.cursor-pointer { cursor: pointer !important; }
.cursor-default { cursor: default !important; }
.cursor-not-allowed { cursor: not-allowed !important; }

/* ===== VISIBILITY UTILITIES ===== */
.visible { visibility: visible !important; }
.invisible { visibility: hidden !important; }

/* ===== TRANSITION UTILITIES ===== */
.transition-fast { transition: all var(--transition-fast) !important; }
.transition { transition: all var(--transition-base) !important; }
.transition-slow { transition: all var(--transition-slow) !important; }
.transition-none { transition: none !important; }

/* ===== COMPONENT CLASSES ===== */

/* Card Component */
.card {
  background: var(--color-bg-primary);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: var(--spacing-6);
  border: 1px solid var(--color-border-light);
  transition: var(--transition-base);
}

.card:hover {
  box-shadow: var(--shadow-md);
}

.card-header {
  padding: var(--spacing-4) var(--spacing-6);
  border-bottom: 1px solid var(--color-border-light);
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-lg);
}

.card-body {
  padding: var(--spacing-6);
}

.card-footer {
  padding: var(--spacing-4) var(--spacing-6);
  border-top: 1px solid var(--color-border-light);
}

/* Badge Component */
.badge {
  display: inline-block;
  padding: 0.35em 0.65em;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  line-height: 1;
  border-radius: var(--radius-sm);
  text-align: center;
  white-space: nowrap;
  vertical-align: baseline;
}

/* Alert Component */
.alert {
  padding: var(--spacing-4) var(--spacing-5);
  margin-bottom: var(--spacing-4);
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
}

.alert-success {
  color: var(--color-success-dark);
  background-color: rgba(40, 167, 69, 0.1);
  border-color: var(--color-success-light);
}

.alert-warning {
  color: var(--color-warning-dark);
  background-color: rgba(255, 193, 7, 0.1);
  border-color: var(--color-warning);
}

.alert-danger {
  color: var(--color-danger-dark);
  background-color: rgba(220, 53, 69, 0.1);
  border-color: var(--color-danger-light);
}

.alert-info {
  color: var(--color-info-dark);
  background-color: rgba(13, 202, 240, 0.1);
  border-color: var(--color-info);
}

/* Divider */
.divider {
  height: 1px;
  background: var(--color-border-light);
  margin: var(--spacing-4) 0;
}

.divider-vertical {
  width: 1px;
  height: auto;
  background: var(--color-border-light);
  margin: 0 var(--spacing-4);
}

/* Loading Spinner */
.spinner {
  display: inline-block;
  width: 1rem;
  height: 1rem;
  border: 2px solid currentColor;
  border-right-color: transparent;
  border-radius: var(--radius-full);
  animation: spinner-rotate 0.75s linear infinite;
}

@keyframes spinner-rotate {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* Container Max Widths */
.container-sm { max-width: 640px; margin: 0 auto; }
.container-md { max-width: 768px; margin: 0 auto; }
.container-lg { max-width: 1024px; margin: 0 auto; }
.container-xl { max-width: 1280px; margin: 0 auto; }

/* Screen Reader Only */
.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 Text */
.truncate {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* Aspect Ratios */
.aspect-square { aspect-ratio: 1 / 1; }
.aspect-video { aspect-ratio: 16 / 9; }
.aspect-4-3 { aspect-ratio: 4 / 3; }

/* ========================================
   RESPONSIVE VISIBILITY UTILITIES
   ======================================== */

/* Hide on mobile */
@media (max-width: 767px) {
  .hide-mobile { display: none !important; }
}

/* Hide on tablet and below */
@media (max-width: 991px) {
  .hide-tablet { display: none !important; }
}

/* Show only on mobile */
@media (min-width: 768px) {
  .show-mobile { display: none !important; }
}

/* Show only on desktop */
@media (max-width: 991px) {
  .show-desktop { display: none !important; }
}

/* ========================================
   INTERACTION UTILITIES
   ======================================== */

/* Hover Effects */
.hover-lift {
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.hover-lift:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.hover-scale {
  transition: transform var(--transition-base);
}

.hover-scale:hover {
  transform: scale(1.05);
}

.hover-brightness:hover {
  filter: brightness(1.1);
}

/* Focus Visible (for keyboard navigation) */
.focus-ring:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Disabled State */
.disabled {
  opacity: 0.6;
  cursor: not-allowed !important;
  pointer-events: none;
}