/* =============================================
   BISU HOSTEL - PROFESSIONAL DESIGN SYSTEM v2.0
   Enhanced by Senior Frontend Developer
   ============================================= */

/* =============================================
   1. DESIGN TOKENS & COLOR PALETTE
   ============================================= */

:root {
  /* Brand Colors */
  --primary: #0046FF;
  --primary-dark: #0035CC;
  --primary-light: #E8EEFF;
  --secondary: #08CB00;
  --secondary-dark: #06A800;
  --accent: #FF6B35;
  --accent-light: #FFE8DC;

  /* Neutral Colors */
  --bg-primary: #FFFFFF;
  --bg-secondary: #F8FAFC;
  --bg-tertiary: #F1F5F9;
  --text-primary: #1A202C;
  --text-secondary: #4A5568;
  --text-tertiary: #718096;
  --border-light: #E2E8F0;
  --border-medium: #CBD5E0;

  /* Status Colors */
  --success: #10B981;
  --warning: #F59E0B;
  --danger: #EF4444;
  --info: #3B82F6;

  /* Spacing System */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 12px;
  --space-lg: 16px;
  --space-xl: 24px;
  --space-2xl: 32px;
  --space-3xl: 48px;
  --space-4xl: 64px;

  /* Typography */
  --font-primary: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-xs: 12px;
  --font-size-sm: 14px;
  --font-size-base: 16px;
  --font-size-lg: 18px;
  --font-size-xl: 20px;
  --font-size-2xl: 24px;
  --font-size-3xl: 32px;
  --font-size-4xl: 40px;
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-2xl: 20px;
  --radius-full: 9999px;

  /* 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);

  /* 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: 350ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* =============================================
   2. RESET & BASE STYLES
   ============================================= */

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

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

body {
  font-family: var(--font-primary);
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* =============================================
   3. TYPOGRAPHY
   ============================================= */

h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-bold);
  line-height: 1.2;
  letter-spacing: -0.5px;
}

h1 {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  color: var(--text-primary);
}

h2 {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  color: var(--text-primary);
}

h3 {
  font-size: var(--font-size-2xl);
  font-weight: 600;
  color: var(--text-primary);
}

h4 {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--text-primary);
}

p {
  color: var(--text-secondary);
  font-size: var(--font-size-base);
  line-height: 1.8;
}

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

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

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

/* =============================================
   4. FORM ELEMENTS
   ============================================= */

input,
textarea,
select,
.form-control {
  font-family: var(--font-primary);
  font-size: var(--font-size-base);
  padding: var(--space-md) var(--space-lg);
  border: 2px solid var(--border-light);
  border-radius: var(--radius-lg);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  transition: all var(--transition-fast);
  width: 100%;
}

input:hover,
textarea:hover,
select:hover,
.form-control:hover {
  border-color: var(--border-medium);
  background-color: var(--bg-secondary);
}

input:focus,
textarea:focus,
select:focus,
.form-control:focus {
  outline: none;
  border-color: var(--primary);
  background-color: var(--bg-primary);
  box-shadow: 0 0 0 4px rgba(0, 70, 255, 0.1);
}

input:disabled,
textarea:disabled,
select:disabled,
.form-control:disabled {
  background-color: var(--bg-tertiary);
  color: var(--text-tertiary);
  cursor: not-allowed;
  opacity: 0.6;
}

textarea {
  resize: vertical;
  min-height: 120px;
}

label {
  display: block;
  margin-bottom: var(--space-md);
  font-weight: var(--font-weight-medium);
  color: var(--text-primary);
  font-size: var(--font-size-sm);
}

/* Form Group */
.form-group {
  margin-bottom: var(--space-xl);
}

.form-group label {
  margin-bottom: var(--space-md);
}

/* Input Error States */
input.is-invalid,
textarea.is-invalid,
select.is-invalid,
.form-control.is-invalid {
  border-color: var(--danger);
  background-color: rgba(239, 68, 68, 0.05);
}

input.is-invalid:focus,
textarea.is-invalid:focus,
select.is-invalid:focus,
.form-control.is-invalid:focus {
  box-shadow: 0 0 0 4px rgba(239, 68, 68, 0.1);
}

.invalid-feedback {
  color: var(--danger);
  font-size: var(--font-size-sm);
  margin-top: var(--space-sm);
}

/* =============================================
   5. BUTTONS
   ============================================= */

button,
.btn,
[type="submit"],
[type="reset"],
[type="button"],
a.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  font-family: var(--font-primary);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  padding: var(--space-md) var(--space-lg);
  border: 2px solid transparent;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
  user-select: none;
}

button:disabled,
.btn:disabled,
[type="submit"]:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none !important;
}

/* Primary Button */
.btn-primary,
button[type="submit"],
[type="submit"] {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: white;
  box-shadow: var(--shadow-md);
}

.btn-primary:hover:not(:disabled),
button[type="submit"]:hover:not(:disabled),
[type="submit"]:hover:not(:disabled) {
  background: linear-gradient(135deg, var(--primary-dark), #002B99);
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.btn-primary:active:not(:disabled),
button[type="submit"]:active:not(:disabled) {
  transform: translateY(0);
  box-shadow: var(--shadow-md);
}

/* Secondary Button */
.btn-secondary {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
  border: 2px solid var(--border-medium);
}

.btn-secondary:hover:not(:disabled) {
  background-color: var(--bg-primary);
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-2px);
}

/* Success Button */
.btn-success {
  background: linear-gradient(135deg, var(--success), var(--secondary-dark));
  color: white;
  box-shadow: var(--shadow-md);
}

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

/* Danger Button */
.btn-danger {
  background: linear-gradient(135deg, var(--danger), #DC2626);
  color: white;
  box-shadow: var(--shadow-md);
}

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

/* Button Sizes */
.btn-sm {
  padding: var(--space-sm) var(--space-md);
  font-size: var(--font-size-sm);
}

.btn-lg {
  padding: var(--space-lg) var(--space-2xl);
  font-size: var(--font-size-lg);
  min-height: 48px;
}

/* Button Block */
.btn-block {
  width: 100%;
}

/* =============================================
   6. CARDS & CONTAINERS
   ============================================= */

.card {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
  overflow: hidden;
}

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

.card-header {
  padding: var(--space-xl);
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-light);
}

.card-body {
  padding: var(--space-xl);
}

.card-footer {
  padding: var(--space-xl);
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-light);
}

/* Container */
.container,
.container-lg,
.container-md,
.container-sm {
  max-width: 1320px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.container-sm {
  max-width: 540px;
}

.container-md {
  max-width: 720px;
}

.container-lg {
  max-width: 960px;
}

/* =============================================
   7. ALERTS & NOTIFICATIONS
   ============================================= */

.alert {
  padding: var(--space-lg);
  border-radius: var(--radius-lg);
  border-left: 4px solid transparent;
  margin-bottom: var(--space-lg);
  display: flex;
  align-items: flex-start;
  gap: var(--space-lg);
}

.alert-icon {
  font-size: var(--font-size-xl);
  flex-shrink: 0;
}

.alert-success {
  background-color: rgba(16, 185, 129, 0.1);
  border-color: var(--success);
  color: var(--success);
}

.alert-warning {
  background-color: rgba(245, 158, 11, 0.1);
  border-color: var(--warning);
  color: var(--warning);
}

.alert-danger {
  background-color: rgba(239, 68, 68, 0.1);
  border-color: var(--danger);
  color: var(--danger);
}

.alert-info {
  background-color: rgba(59, 130, 246, 0.1);
  border-color: var(--info);
  color: var(--info);
}

/* =============================================
   8. TABLES
   ============================================= */

table {
  width: 100%;
  border-collapse: collapse;
  background-color: var(--bg-primary);
}

thead {
  background-color: var(--bg-secondary);
}

th {
  padding: var(--space-lg);
  text-align: left;
  font-weight: var(--font-weight-semibold);
  color: var(--text-primary);
  border-bottom: 2px solid var(--border-light);
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

td {
  padding: var(--space-lg);
  border-bottom: 1px solid var(--border-light);
}

tbody tr {
  transition: background-color var(--transition-fast);
}

tbody tr:hover {
  background-color: var(--bg-tertiary);
}

/* =============================================
   9. BADGES & LABELS
   ============================================= */

.badge {
  display: inline-block;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  white-space: nowrap;
}

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

.badge-success {
  background-color: rgba(16, 185, 129, 0.1);
  color: var(--success);
}

.badge-danger {
  background-color: rgba(239, 68, 68, 0.1);
  color: var(--danger);
}

.badge-warning {
  background-color: rgba(245, 158, 11, 0.1);
  color: var(--warning);
}

.badge-secondary {
  background-color: var(--bg-tertiary);
  color: var(--text-secondary);
}

/* =============================================
   10. UTILITIES & HELPERS
   ============================================= */

/* Spacing */
.mt-xs { margin-top: var(--space-xs); }
.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }
.mt-2xl { margin-top: var(--space-2xl); }
.mt-3xl { margin-top: var(--space-3xl); }

.mb-xs { margin-bottom: var(--space-xs); }
.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }
.mb-2xl { margin-bottom: var(--space-2xl); }
.mb-3xl { margin-bottom: var(--space-3xl); }

.px-lg { padding-left: var(--space-lg); padding-right: var(--space-lg); }
.py-lg { padding-top: var(--space-lg); padding-bottom: var(--space-lg); }
.p-lg { padding: var(--space-lg); }
.p-xl { padding: var(--space-xl); }

/* Text Utilities */
.text-primary { color: var(--primary); }
.text-secondary { color: var(--text-secondary); }
.text-tertiary { color: var(--text-tertiary); }
.text-success { color: var(--success); }
.text-danger { color: var(--danger); }
.text-warning { color: var(--warning); }

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

.font-light { font-weight: var(--font-weight-light); }
.font-normal { font-weight: var(--font-weight-normal); }
.font-medium { font-weight: var(--font-weight-medium); }
.font-semibold { font-weight: var(--font-weight-semibold); }
.font-bold { font-weight: var(--font-weight-bold); }

.text-uppercase { text-transform: uppercase; }
.text-lowercase { text-transform: lowercase; }
.text-capitalize { text-transform: capitalize; }

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

/* Display & Visibility */
.d-none { display: none; }
.d-inline { display: inline; }
.d-inline-block { display: inline-block; }
.d-block { display: block; }
.d-flex { display: flex; }
.d-grid { display: grid; }

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

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

.flex-column { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.gap-md { gap: var(--space-lg); }
.gap-lg { gap: var(--space-xl); }

.hidden { display: none !important; }
.invisible { visibility: hidden; }

/* Opacity */
.opacity-50 { opacity: 0.5; }
.opacity-70 { opacity: 0.7; }
.opacity-100 { opacity: 1; }

/* Cursor */
.cursor-pointer { cursor: pointer; }
.cursor-default { cursor: default; }
.cursor-disabled { cursor: not-allowed; }

/* =============================================
   11. RESPONSIVE UTILITIES
   ============================================= */

@media (max-width: 768px) {
  .d-md-none { display: none; }
  .d-md-block { display: block; }
  .d-md-flex { display: flex; }

  h1 { font-size: var(--font-size-3xl); }
  h2 { font-size: var(--font-size-2xl); }
  h3 { font-size: var(--font-size-xl); }

  .container,
  .container-lg,
  .container-md {
    max-width: 100%;
    padding: 0 var(--space-lg);
  }
}

/* =============================================
   12. ANIMATIONS
   ============================================= */

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideDown {
  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 spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

.fade-in { animation: fadeIn var(--transition-base); }
.slide-up { animation: slideUp var(--transition-base); }
.slide-down { animation: slideDown var(--transition-base); }
.slide-in-left { animation: slideInLeft var(--transition-base); }
.slide-in-right { animation: slideInRight var(--transition-base); }

/* =============================================
   13. SCROLLBAR STYLING
   ============================================= */

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

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

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

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