/* ============================================
   INTERNSHIP PORTAL - DESIGN SYSTEM
   Modern SaaS-style UI/UX
   ============================================ */

/* ============================================
   CSS VARIABLES - BRAND COLORS & DESIGN TOKENS
   ============================================ */
:root {
  /* Brand Colors */
  --primary: #0d4052;
  --primary-dark: #0a2f3d;
  --primary-light: #1a5a6f;
  --secondary: #4a90e2;
  --secondary-dark: #357abd;
  --secondary-light: #6ba3e8;
  --background: #f4f5f7;
  --background-light: #ffffff;
  --text-dark: #1a1a1a;
  --text-medium: #4a5568;
  --text-light: #718096;
  --text-white: #ffffff;
  
  /* Semantic Colors */
  --success: #10b981;
  --success-light: #d1fae5;
  --warning: #f59e0b;
  --warning-light: #fef3c7;
  --danger: #ef4444;
  --danger-light: #fee2e2;
  --info: #3b82f6;
  --info-light: #dbeafe;
  
  /* Design Tokens */
  --radius: 10px;
  --radius-sm: 6px;
  --radius-lg: 16px;
  --transition: 0.25s ease;
  --transition-fast: 0.15s ease;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 8px 16px rgba(0, 0, 0, 0.12);
  --shadow-lg: 0 12px 24px rgba(0, 0, 0, 0.15);
  
  /* Spacing Scale */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  
  /* Typography */
  --font-heading: 'Poppins', sans-serif;
  --font-body: 'Inter', sans-serif;
}

/* ============================================
   GLOBAL RESET & BASE STYLES
   ============================================ */
* {
  box-sizing: border-box;
}

body {
  font-family: var(--font-body);
  font-weight: 400;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-dark);
  background-color: var(--background);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6,
.h1, .h2, .h3, .h4, .h5, .h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.3;
  color: var(--text-dark);
  margin-bottom: var(--spacing-md);
}

h1, .h1 { font-size: 2.5rem; font-weight: 900; }
h2, .h2 { font-size: 2rem; font-weight: 800; }
h3, .h3 { font-size: 1.75rem; font-weight: 700; }
h4, .h4 { font-size: 1.5rem; font-weight: 700; }
h5, .h5 { font-size: 1.25rem; font-weight: 600; }
h6, .h6 { font-size: 1.125rem; font-weight: 600; }

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

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

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

/* ============================================
   ANIMATIONS
   ============================================ */
@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

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

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

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

.slide-up {
  animation: slideUp 0.5s ease-out;
}

/* Page load animation */
main {
  animation: fadeIn 0.6s ease-out;
}

/* ============================================
   NAVIGATION
   ============================================ */
.navbar {
  background: var(--primary) !important;
  box-shadow: var(--shadow-md);
  padding: var(--spacing-md) 0;
  border-radius: 0;
}

.navbar .container {
  padding-left: 1rem;
  padding-right: 2rem;
}

.navbar .container-fluid {
  padding-left: 0.5rem;
  padding-right: 2.5rem;
}

.navbar-brand {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.5rem;
  color: var(--text-white) !important;
  transition: transform var(--transition-fast);
  display: flex;
  align-items: center;
  padding: 0;
  margin-left: 0 !important;
  margin-right: 3rem;
}

.navbar-brand img {
  height: 60px;
  width: auto;
  object-fit: contain;
}

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

.nav-link {
  font-weight: 500;
  color: rgba(255, 255, 255, 0.9) !important;
  padding: var(--spacing-sm) var(--spacing-md) !important;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  margin: 0 0.5rem;
  white-space: nowrap;
  text-align: center;
  display: inline-block;
}

.navbar-nav {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.navbar-nav .nav-item {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.navbar-nav.ms-auto {
  margin-left: auto !important;
  padding-right: 0;
  margin-right: 0 !important;
  gap: 1rem;
}

.navbar-nav.ms-auto .nav-item {
  margin-left: 0.5rem;
}

.navbar-text {
  margin-right: 0.5rem !important;
}

.nav-link:hover {
  background-color: rgba(255, 255, 255, 0.1);
  color: var(--text-white) !important;
}

.nav-link.active {
  background-color: var(--secondary);
  color: var(--text-white) !important;
}

.navbar-text {
  color: rgba(255, 255, 255, 0.9) !important;
  font-weight: 500;
}

/* Dropdown Menu */
.nav-item.dropdown {
  position: relative;
}

.dropdown-toggle {
  position: relative;
  cursor: pointer;
}

.dropdown-menu {
  background: var(--background-light);
  border: none;
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  padding: var(--spacing-sm) 0;
  margin-top: 0;
  position: absolute;
  top: 100%;
  left: 0;
  z-index: 1000;
  min-width: 200px;
  display: none;
}

/* Keep dropdown open when hovering over it */
.nav-item.dropdown:hover .dropdown-menu,
.dropdown-menu:hover {
  display: block;
  animation: slideUp 0.2s ease-out;
}

/* Add padding-top to dropdown menu to create hover bridge */
.nav-item.dropdown .dropdown-menu::before {
  content: '';
  display: block;
  position: absolute;
  top: -10px;
  left: 0;
  right: 0;
  height: 10px;
  background: transparent;
}


.dropdown-item {
  padding: var(--spacing-sm) var(--spacing-lg);
  color: var(--text-dark);
  transition: all var(--transition-fast);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.dropdown-item:hover {
  background-color: #f8fafc;
  color: var(--primary);
}

/* Notification Badge */
.notification-badge {
  position: absolute;
  top: -4px;
  right: -8px;
  font-size: 0.7rem;
  padding: 0.25rem 0.5rem;
  border-radius: 10px;
  min-width: 20px;
  text-align: center;
  transition: all var(--transition);
}

.notification-badge-dropdown {
  font-size: 0.75rem;
  padding: 0.25rem 0.5rem;
  border-radius: 10px;
  min-width: 20px;
  text-align: center;
  opacity: 0;
  transform: scale(0);
  transition: all var(--transition);
}

.dropdown:hover .notification-badge-dropdown {
  opacity: 1;
  transform: scale(1);
}

.dropdown:hover .notification-badge {
  opacity: 0;
  transform: scale(0);
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
  font-family: var(--font-body);
  font-weight: 500;
  padding: 0.625rem 1.5rem;
  border-radius: var(--radius);
  border: none;
  transition: all var(--transition);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  box-shadow: var(--shadow-sm);
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn:active {
  transform: translateY(0);
}

/* Primary Button */
.btn-primary,
.btn-success {
  background: var(--primary);
  color: var(--text-white);
}

.btn-primary:hover,
.btn-success:hover {
  background: var(--primary-dark);
  color: var(--text-white);
}

/* Secondary Button */
.btn-secondary,
.btn-outline-secondary {
  background: transparent;
  color: var(--text-medium);
  border: 2px solid var(--text-light);
}

.btn-secondary:hover,
.btn-outline-secondary:hover {
  background: var(--text-light);
  color: var(--text-dark);
  border-color: var(--text-light);
}

/* Outline Primary */
.btn-outline-primary {
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
}

.btn-outline-primary:hover {
  background: var(--primary);
  color: var(--text-white);
}

/* Success Button */
.btn-success {
  background: var(--success);
}

.btn-success:hover {
  background: #059669;
}

/* Danger Button */
.btn-danger,
.btn-outline-danger {
  background: var(--danger);
  color: var(--text-white);
}

.btn-danger:hover,
.btn-outline-danger:hover {
  background: #dc2626;
}

.btn-outline-danger {
  background: transparent;
  border: 2px solid var(--danger);
  color: var(--danger);
}

.btn-outline-danger:hover {
  background: var(--danger);
  color: var(--text-white);
}

/* Warning Button */
.btn-warning {
  background: var(--warning);
  color: var(--text-dark);
}

.btn-warning:hover {
  background: #d97706;
}

/* Info Button */
.btn-info {
  background: var(--info);
  color: var(--text-white);
}

.btn-info:hover {
  background: #2563eb;
}

/* Button Sizes */
.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
}

.btn-lg {
  padding: 0.875rem 2rem;
  font-size: 1.125rem;
}

/* ============================================
   CARDS
   ============================================ */
.card {
  background: var(--background-light);
  border: none;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  transition: all var(--transition);
  overflow: hidden;
}

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

.card-header {
  background: var(--primary);
  color: var(--text-white) !important;
  border: none;
  padding: var(--spacing-lg);
  font-family: var(--font-heading);
  font-weight: 600;
}

.card-header h5,
.card-header h6,
.card-header .h5,
.card-header .h6 {
  color: var(--text-white) !important;
}

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

.card-title {
  font-family: var(--font-heading);
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: var(--spacing-md);
}

/* Metric Cards */
.metric-card {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  color: var(--text-white);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-md);
  transition: all var(--transition);
}

.metric-card:hover {
  transform: translateY(-4px) scale(1.02);
  box-shadow: var(--shadow-lg);
}

.metric-card h6 {
  color: rgba(255, 255, 255, 0.9);
  font-weight: 500;
  margin-bottom: var(--spacing-sm);
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.metric-card h2 {
  color: var(--text-white);
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 0;
}

/* ============================================
   FORMS
   ============================================ */
.form-label {
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: var(--spacing-sm);
  font-size: 0.9375rem;
}

.form-control,
.form-select {
  border: 2px solid #e2e8f0;
  border-radius: var(--radius);
  padding: 0.75rem 1rem;
  font-family: var(--font-body);
  font-size: 1rem;
  transition: all var(--transition-fast);
  background-color: var(--background-light);
}

.form-control:focus,
.form-select:focus {
  border-color: var(--secondary);
  outline: none;
  box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.1);
  background-color: var(--background-light);
}

.form-control::placeholder {
  color: var(--text-light);
}

.form-text {
  color: var(--text-light);
  font-size: 0.875rem;
  margin-top: var(--spacing-xs);
}

/* Form Check */
.form-check-input {
  width: 1.25rem;
  height: 1.25rem;
  border: 2px solid #e2e8f0;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.form-check-input:checked {
  background-color: var(--primary);
  border-color: var(--primary);
}

.form-check-input:focus {
  box-shadow: 0 0 0 3px rgba(13, 64, 82, 0.1);
}

.form-check-label {
  font-weight: 500;
  color: var(--text-dark);
  margin-left: var(--spacing-sm);
  cursor: pointer;
}

/* Form Switch */
.form-switch .form-check-input {
  width: 2.5rem;
  height: 1.25rem;
  border-radius: 1.25rem;
}

/* Error Messages */
.text-danger {
  color: var(--danger) !important;
  font-size: 0.875rem;
  margin-top: var(--spacing-xs);
  font-weight: 500;
}

/* ============================================
   BADGES & CHIPS
   ============================================ */
.badge {
  font-family: var(--font-body);
  font-weight: 600;
  padding: 0.375rem 0.75rem;
  border-radius: var(--radius);
  font-size: 0.8125rem;
  display: inline-flex;
  align-items: center;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.bg-primary {
  background-color: var(--primary) !important;
  color: var(--text-white) !important;
}

.bg-secondary {
  background-color: var(--text-light) !important;
  color: var(--text-white) !important;
}

.bg-success {
  background-color: var(--success) !important;
  color: var(--text-white) !important;
}

.bg-warning {
  background-color: var(--warning) !important;
  color: var(--text-dark) !important;
}

.bg-danger {
  background-color: var(--danger) !important;
  color: var(--text-white) !important;
}

.bg-info {
  background-color: var(--info) !important;
  color: var(--text-white) !important;
}

/* Status Badges */
.badge-status-pending {
  background-color: var(--warning-light) !important;
  color: var(--warning) !important;
}

.badge-status-approved {
  background-color: var(--success-light) !important;
  color: var(--success) !important;
}

.badge-status-shortlisted {
  background-color: var(--info-light) !important;
  color: var(--info) !important;
}

.badge-status-rejected {
  background-color: var(--danger-light) !important;
  color: var(--danger) !important;
}

/* ============================================
   TABLES
   ============================================ */
.table {
  background: var(--background-light);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.table thead {
  background: var(--primary);
  color: var(--text-white);
}

.table thead th {
  font-family: var(--font-heading);
  font-weight: 600;
  text-transform: uppercase;
  font-size: 0.8125rem;
  letter-spacing: 0.5px;
  padding: var(--spacing-lg);
  border: none;
}

.table tbody tr {
  transition: all var(--transition-fast);
  border-bottom: 1px solid #e2e8f0;
}

.table tbody tr:hover {
  background-color: #f8fafc;
  transform: scale(1.01);
  box-shadow: var(--shadow-sm);
}

.table tbody td {
  padding: var(--spacing-lg);
  vertical-align: middle;
  color: var(--text-medium);
}

.table-striped tbody tr:nth-of-type(odd) {
  background-color: #fafbfc;
}

.table-striped tbody tr:nth-of-type(odd):hover {
  background-color: #f1f5f9;
}

/* ============================================
   ALERTS & NOTIFICATIONS
   ============================================ */
.alert {
  border: none;
  border-radius: var(--radius);
  padding: var(--spacing-md) var(--spacing-lg);
  margin-bottom: var(--spacing-md);
  font-weight: 500;
  box-shadow: var(--shadow-sm);
}

.alert-success {
  background-color: var(--success-light);
  color: #065f46;
  border-left: 4px solid var(--success);
}

.alert-danger {
  background-color: var(--danger-light);
  color: #991b1b;
  border-left: 4px solid var(--danger);
}

.alert-warning {
  background-color: var(--warning-light);
  color: #92400e;
  border-left: 4px solid var(--warning);
}

.alert-info {
  background-color: var(--info-light);
  color: #1e40af;
  border-left: 4px solid var(--info);
}

/* ============================================
   NAV PILLS / TABS
   ============================================ */
.nav-pills {
  border-bottom: 2px solid #e2e8f0;
  padding-bottom: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
  display: flex;
  flex-wrap: nowrap;
  overflow-x: auto;
}

.nav-pills .nav-link {
  background: transparent;
  color: var(--text-medium) !important;
  border-radius: var(--radius) var(--radius) 0 0;
  padding: var(--spacing-sm) var(--spacing-md) !important;
  margin-right: var(--spacing-xs);
  border: none;
  border-bottom: 3px solid transparent;
  transition: all var(--transition);
  position: relative;
  white-space: nowrap;
  flex-shrink: 0;
  font-size: 0.9rem;
}

.nav-pills .nav-link:hover {
  background: rgba(13, 64, 82, 0.05);
  color: var(--primary) !important;
}

.nav-pills .nav-link.active {
  background: transparent;
  color: var(--primary) !important;
  border-bottom-color: var(--primary);
  font-weight: 600;
}

/* ============================================
   LIST GROUPS
   ============================================ */
.list-group-item {
  border: 1px solid #e2e8f0;
  border-radius: var(--radius) !important;
  margin-bottom: var(--spacing-sm);
  padding: var(--spacing-lg);
  transition: all var(--transition-fast);
  background: var(--background-light);
}

.list-group-item:hover {
  background-color: #f8fafc;
  border-color: var(--secondary);
  transform: translateX(4px);
  box-shadow: var(--shadow-sm);
}

.list-group-item:first-child {
  border-top-left-radius: var(--radius) !important;
  border-top-right-radius: var(--radius) !important;
}

.list-group-item:last-child {
  border-bottom-left-radius: var(--radius) !important;
  border-bottom-right-radius: var(--radius) !important;
}

/* ============================================
   ANNOUNCEMENTS SIDEBAR
   ============================================ */
.announcements-sidebar {
  position: sticky;
  top: 90px;
  max-height: calc(100vh - 120px);
  overflow-y: auto;
  border-radius: var(--radius-lg);
}

.announcements-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-weight: 600;
  color: var(--primary);
}

.announcements-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.announcement-card {
  border-radius: var(--radius);
  padding: var(--spacing-sm) var(--spacing-md);
  background: #f9fafb;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-fast);
}

.announcement-card:hover {
  background: #ffffff;
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.announcement-card-title {
  font-size: 0.95rem;
  font-weight: 600;
  margin: 0;
  color: var(--primary-dark);
}

.announcement-body {
  color: var(--text-medium);
}

.announcement-tags .badge {
  font-size: 0.7rem;
}

.announcement-date {
  white-space: nowrap;
}

@media (max-width: 992px) {
  .announcements-sidebar {
    position: static;
    max-height: none;
    margin-top: var(--spacing-md);
  }
}

/* ============================================
   ANNOUNCEMENTS HORIZONTAL BAR
   ============================================ */
.announcements-bar {
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, #f8fafc 0%, #ffffff 100%);
}

.announcements-bar-title {
  font-weight: 600;
  color: var(--primary);
  display: flex;
  align-items: center;
}

.announcements-bar-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
}

.announcement-bar-item {
  padding: var(--spacing-md);
  background: #f9fafb;
  border-radius: var(--radius);
  border-left: 3px solid var(--primary);
  transition: all var(--transition-fast);
}

.announcement-bar-item:hover {
  background: #ffffff;
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.announcement-bar-title {
  font-size: 1rem;
  font-weight: 600;
  margin: 0;
  color: var(--primary-dark);
}

.announcement-bar-body {
  color: var(--text-medium);
  line-height: 1.5;
}

.announcement-bar-tags .badge {
  font-size: 0.7rem;
}

.announcement-bar-date {
  white-space: nowrap;
  font-size: 0.75rem;
}

.announcement-bar-meta {
  font-size: 0.75rem;
  margin-top: var(--spacing-xs);
}

@media (max-width: 768px) {
  .announcements-bar-list {
    grid-template-columns: 1fr;
  }
}

/* ============================================
   MODALS
   ============================================ */
.modal-content {
  border: none;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  animation: scaleIn 0.3s ease-out;
}

.modal-header {
  background: var(--primary);
  color: var(--text-white);
  border: none;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  padding: var(--spacing-lg);
}

.modal-title {
  font-family: var(--font-heading);
  font-weight: 700;
  color: var(--text-white);
}

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

.modal-footer {
  border: none;
  padding: var(--spacing-lg) var(--spacing-xl);
  background: #f8fafc;
}

/* ============================================
   UTILITIES
   ============================================ */
.text-muted {
  color: var(--text-light) !important;
}

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

.shadow {
  box-shadow: var(--shadow) !important;
}

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

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

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */
@media (max-width: 768px) {
  h1, .h1 { font-size: 2rem; }
  h2, .h2 { font-size: 1.75rem; }
  h3, .h3 { font-size: 1.5rem; }
  
  .card-body {
    padding: var(--spacing-lg);
  }
  
  .btn {
    width: 100%;
    margin-bottom: var(--spacing-sm);
  }
  
  .table {
    font-size: 0.875rem;
  }
  
  .table thead th,
  .table tbody td {
    padding: var(--spacing-md);
  }
  
  .navbar-nav {
    margin-top: var(--spacing-md);
  }
  
  .nav-link {
    margin: var(--spacing-xs) 0;
  }
}

@media (max-width: 576px) {
  .container {
    padding-left: var(--spacing-md);
    padding-right: var(--spacing-md);
  }
  
  .metric-card h2 {
    font-size: 2rem;
  }
}

/* ============================================
   PRINT STYLES
   ============================================ */
@media print {
  .navbar,
  .btn,
  .alert {
    display: none;
  }
  
  .card {
    box-shadow: none;
    border: 1px solid #e2e8f0;
  }
}