/* ========================================
   SMART CAMPUS FOOD ORDERING SYSTEM
   Design System & Global Styles
   ======================================== */

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

/* ========================================
   CSS VARIABLES & DESIGN TOKENS
   ======================================== */
:root {
  /* Color Palette - Vibrant & Modern */
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --primary-light: #818cf8;
  --secondary: #f59e0b;
  --secondary-dark: #d97706;
  --accent: #10b981;
  --accent-dark: #059669;

  /* Neutral Colors */
  --dark: #0f172a;
  --dark-secondary: #1e293b;
  --dark-tertiary: #334155;
  --gray: #64748b;
  --light-gray: #cbd5e1;
  --lighter-gray: #f1f5f9;
  --white: #ffffff;

  /* Status Colors */
  --status-placed: #3b82f6;
  --status-preparing: #f59e0b;
  --status-ready: #10b981;
  --status-completed: #6366f1;
  --error: #ef4444;
  --warning: #f59e0b;
  --success: #10b981;

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.3);

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  --gradient-success: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
  --gradient-warm: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
  --gradient-dark: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);

  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-normal: 300ms ease-in-out;
  --transition-slow: 500ms ease-in-out;
}

/* ========================================
   RESET & BASE STYLES
   ======================================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--dark);
  background: var(--lighter-gray);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ========================================
   TYPOGRAPHY
   ======================================== */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
}

h1 {
  font-size: var(--font-size-4xl);
}

h2 {
  font-size: var(--font-size-3xl);
}

h3 {
  font-size: var(--font-size-2xl);
}

h4 {
  font-size: var(--font-size-xl);
}

h5 {
  font-size: var(--font-size-lg);
}

h6 {
  font-size: var(--font-size-base);
}

p {
  margin-bottom: var(--spacing-md);
}

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

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

/* ========================================
   CONTAINER & LAYOUT
   ======================================== */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.container-sm {
  max-width: 600px;
}

.container-lg {
  max-width: 1400px;
}

/* ========================================
   BUTTON COMPONENTS
   ======================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: 0.75rem 1.5rem;
  font-size: var(--font-size-base);
  font-weight: 600;
  line-height: 1;
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-normal);
  text-decoration: none;
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--gradient-primary);
  color: var(--white);
  box-shadow: var(--shadow-md);
}

.btn-primary:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl), var(--shadow-glow);
}

.btn-secondary {
  background: var(--gradient-warm);
  color: var(--white);
  box-shadow: var(--shadow-md);
}

.btn-secondary:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
}

.btn-success {
  background: var(--accent);
  color: var(--white);
  box-shadow: var(--shadow-md);
}

.btn-success:hover:not(:disabled) {
  background: var(--accent-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
}

.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
  box-shadow: none;
}

.btn-outline:hover:not(:disabled) {
  background: var(--primary);
  color: var(--white);
}

.btn-ghost {
  background: transparent;
  color: var(--gray);
  box-shadow: none;
}

.btn-ghost:hover:not(:disabled) {
  background: var(--lighter-gray);
  color: var(--dark);
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: var(--font-size-sm);
}

.btn-lg {
  padding: 1rem 2rem;
  font-size: var(--font-size-lg);
}

.btn-full {
  width: 100%;
}

/* ========================================
   CARD COMPONENT
   ======================================== */
.card {
  background: var(--white);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
}

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

.card-header {
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-md);
  border-bottom: 2px solid var(--lighter-gray);
}

.card-title {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  margin-bottom: var(--spacing-xs);
}

.card-subtitle {
  font-size: var(--font-size-sm);
  color: var(--gray);
  margin-bottom: 0;
}

.card-body {
  margin-bottom: var(--spacing-lg);
}

.card-footer {
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-md);
  border-top: 2px solid var(--lighter-gray);
}

/* Glassmorphism Card */
.card-glass {
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.3);
}

/* Gradient Card */
.card-gradient {
  background: var(--gradient-primary);
  color: var(--white);
}

.card-gradient .card-title,
.card-gradient .card-subtitle {
  color: var(--white);
}

/* ========================================
   FORM COMPONENTS
   ======================================== */
.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--dark);
  margin-bottom: var(--spacing-sm);
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 0.875rem 1rem;
  font-size: var(--font-size-base);
  font-family: var(--font-family);
  color: var(--dark);
  background: var(--white);
  border: 2px solid var(--light-gray);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  outline: none;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-input::placeholder {
  color: var(--gray);
}

.form-textarea {
  resize: vertical;
  min-height: 100px;
}

.form-error {
  display: block;
  font-size: var(--font-size-sm);
  color: var(--error);
  margin-top: var(--spacing-xs);
}

/* ========================================
   BADGE COMPONENT
   ======================================== */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.375rem 0.75rem;
  font-size: var(--font-size-xs);
  font-weight: 600;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

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

.badge-success {
  background: #d1fae5;
  color: var(--accent-dark);
}

.badge-warning {
  background: #fef3c7;
  color: var(--secondary-dark);
}

.badge-info {
  background: #dbeafe;
  color: var(--status-placed);
}

.badge-error {
  background: #fee2e2;
  color: #dc2626;
}

/* ========================================
   NAVIGATION
   ======================================== */
.navbar {
  background: var(--white);
  box-shadow: var(--shadow-md);
  position: sticky;
  top: 0;
  z-index: 1000;
  padding: var(--spacing-md) 0;
}

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

.navbar-brand {
  font-size: var(--font-size-xl);
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.navbar-nav {
  display: flex;
  gap: var(--spacing-lg);
  list-style: none;
  align-items: center;
}

.nav-link {
  font-weight: 500;
  color: var(--dark);
  transition: color var(--transition-fast);
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: width var(--transition-normal);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

.nav-link:hover,
.nav-link.active {
  color: var(--primary);
}

/* ========================================
   GRID SYSTEM
   ======================================== */
.grid {
  display: grid;
  gap: var(--spacing-lg);
}

.grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.grid-4 {
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

/* ========================================
   UTILITIES
   ======================================== */
.text-center {
  text-align: center;
}

.text-left {
  text-align: left;
}

.text-right {
  text-align: right;
}

.text-primary {
  color: var(--primary);
}

.text-secondary {
  color: var(--secondary);
}

.text-success {
  color: var(--accent);
}

.text-error {
  color: var(--error);
}

.text-gray {
  color: var(--gray);
}

.text-white {
  color: var(--white);
}

.bg-primary {
  background: var(--primary);
}

.bg-secondary {
  background: var(--secondary);
}

.bg-dark {
  background: var(--dark);
}

.bg-light {
  background: var(--lighter-gray);
}

.bg-white {
  background: var(--white);
}

.mt-sm {
  margin-top: var(--spacing-sm);
}

.mt-md {
  margin-top: var(--spacing-md);
}

.mt-lg {
  margin-top: var(--spacing-lg);
}

.mt-xl {
  margin-top: var(--spacing-xl);
}

.mt-2xl {
  margin-top: var(--spacing-2xl);
}

.mb-sm {
  margin-bottom: var(--spacing-sm);
}

.mb-md {
  margin-bottom: var(--spacing-md);
}

.mb-lg {
  margin-bottom: var(--spacing-lg);
}

.mb-xl {
  margin-bottom: var(--spacing-xl);
}

.mb-2xl {
  margin-bottom: var(--spacing-2xl);
}

.p-sm {
  padding: var(--spacing-sm);
}

.p-md {
  padding: var(--spacing-md);
}

.p-lg {
  padding: var(--spacing-lg);
}

.p-xl {
  padding: var(--spacing-xl);
}

.hidden {
  display: none !important;
}

.visible {
  display: block;
}

.flex {
  display: flex;
}

.flex-col {
  flex-direction: column;
}

.items-center {
  align-items: center;
}

.justify-center {
  justify-content: center;
}

.justify-between {
  justify-content: space-between;
}

.gap-sm {
  gap: var(--spacing-sm);
}

.gap-md {
  gap: var(--spacing-md);
}

.gap-lg {
  gap: var(--spacing-lg);
}

.rounded {
  border-radius: var(--radius-md);
}

.rounded-lg {
  border-radius: var(--radius-lg);
}

.rounded-xl {
  border-radius: var(--radius-xl);
}

.rounded-full {
  border-radius: var(--radius-full);
}

.shadow-sm {
  box-shadow: var(--shadow-sm);
}

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

.shadow-lg {
  box-shadow: var(--shadow-lg);
}

.shadow-xl {
  box-shadow: var(--shadow-xl);
}

/* ========================================
   ANIMATIONS
   ======================================== */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(30px);
  }

  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes pulse {

  0%,
  100% {
    opacity: 1;
  }

  50% {
    opacity: 0.5;
  }
}

@keyframes spin {
  from {
    transform: rotate(0deg);
  }

  to {
    transform: rotate(360deg);
  }
}

.animate-fade-in {
  animation: fadeIn 0.5s ease-out;
}

.animate-slide-in {
  animation: slideInRight 0.5s ease-out;
}

.animate-pulse {
  animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

.animate-spin {
  animation: spin 1s linear infinite;
}

/* ========================================
   LOADING SPINNER
   ======================================== */
.spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--lighter-gray);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.spinner-sm {
  width: 20px;
  height: 20px;
  border-width: 2px;
}

/* ========================================
   ALERT COMPONENT
   ======================================== */
.alert {
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-lg);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.alert-success {
  background: #d1fae5;
  color: var(--accent-dark);
  border-left: 4px solid var(--accent);
}

.alert-error {
  background: #fee2e2;
  color: #dc2626;
  border-left: 4px solid var(--error);
}

.alert-warning {
  background: #fef3c7;
  color: var(--secondary-dark);
  border-left: 4px solid var(--warning);
}

.alert-info {
  background: #dbeafe;
  color: var(--status-placed);
  border-left: 4px solid var(--status-placed);
}

/* ========================================
   MODAL/OVERLAY
   ======================================== */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  padding: var(--spacing-lg);
}

.modal {
  background: var(--white);
  border-radius: var(--radius-2xl);
  max-width: 600px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-2xl);
  animation: fadeIn 0.3s ease-out;
}

.modal-header {
  padding: var(--spacing-xl);
  border-bottom: 2px solid var(--lighter-gray);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-title {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  margin: 0;
}

.modal-close {
  background: none;
  border: none;
  font-size: var(--font-size-2xl);
  color: var(--gray);
  cursor: pointer;
  padding: 0;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.modal-close:hover {
  background: var(--lighter-gray);
  color: var(--dark);
}

.modal-body {
  padding: var(--spacing-xl);
}

.modal-footer {
  padding: var(--spacing-xl);
  border-top: 2px solid var(--lighter-gray);
  display: flex;
  justify-content: flex-end;
  gap: var(--spacing-md);
}

/* ========================================
   RESPONSIVE DESIGN
   ======================================== */
@media (max-width: 768px) {
  :root {
    --font-size-4xl: 1.875rem;
    --font-size-3xl: 1.5rem;
    --font-size-2xl: 1.25rem;
  }

  .navbar-nav {
    gap: var(--spacing-md);
  }

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

  .container {
    padding: 0 var(--spacing-md);
  }

  .card {
    padding: var(--spacing-lg);
  }
}
.hidden { display: none !important; }