/* ========================================
   Modern Theme for ExamPlatform
   ======================================== */

/* Base Typography & Colors */
:root {
  --primary-color: #4f46e5;
  --primary-hover: #4338ca;
  --secondary-color: #10b981;
  --accent-color: #f59e0b;
  --dark-bg: #1f2937;
  --darker-bg: #111827;
  --light-bg: #f9fafb;
  --border-color: #e5e7eb;
  --text-primary: #111827;
  --text-secondary: #6b7280;
  --text-light: #9ca3af;
  --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --card-shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

html {
  font-size: 15px;
  scroll-behavior: smooth;
}

@media (min-width: 768px) {
  html {
    font-size: 16px;
  }
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  color: var(--text-primary);
  background-color: var(--light-bg);
  margin: 0;
  padding: 0;
}

/* Modern Focus Styles */
.btn:focus,
.btn:active:focus,
.btn-link.nav-link:focus,
.form-control:focus,
.form-check-input:focus {
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.2);
  border-color: var(--primary-color);
  outline: none;
}

/* Typography Enhancements */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  letter-spacing: -0.025em;
  color: var(--text-primary);
}

h1 {
  font-size: 2.5rem;
  margin-bottom: 1.5rem;
}

/* Modern Button Styles */
.btn {
  border-radius: 0.5rem;
  font-weight: 600;
  padding: 0.625rem 1.25rem;
  transition: all 0.2s ease-in-out;
  border: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-hover) 100%);
  box-shadow: 0 4px 6px -1px rgba(79, 70, 229, 0.3);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--primary-hover) 0%, #3730a3 100%);
  transform: translateY(-1px);
  box-shadow: 0 10px 15px -3px rgba(79, 70, 229, 0.4);
}

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

.btn-secondary {
  background-color: var(--secondary-color);
  color: white;
}

.btn-secondary:hover {
  background-color: #059669;
  transform: translateY(-1px);
}

.btn-link {
  color: var(--primary-color);
  text-decoration: none;
  font-weight: 600;
}

.btn-link:hover {
  color: var(--primary-hover);
  text-decoration: underline;
}

.btn-lg {
  padding: 0.875rem 1.75rem;
  font-size: 1.125rem;
}

/* Modern Form Styles */
.form-control,
.form-select {
  border-radius: 0.5rem;
  border: 1px solid var(--border-color);
  padding: 0.75rem 1rem;
  transition: all 0.2s ease-in-out;
  font-size: 0.9375rem;
}

.form-control:focus,
.form-select:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.form-floating > .form-control,
.form-floating > .form-select {
  border-radius: 0.5rem;
}

.form-floating > label {
  color: var(--text-secondary);
}

/* Card Styles */
.card {
  border: none;
  border-radius: 1rem;
  box-shadow: var(--card-shadow);
  background: white;
  transition: all 0.3s ease-in-out;
}

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

.card-header {
  background-color: white;
  border-bottom: 1px solid var(--border-color);
  border-radius: 1rem 1rem 0 0 !important;
  padding: 1.25rem 1.5rem;
}

.card-body {
  padding: 1.5rem;
}

/* Alert Styles */
.alert {
  border-radius: 0.75rem;
  border: none;
  padding: 1rem 1.25rem;
  box-shadow: var(--card-shadow);
}

.alert-info {
  background: linear-gradient(135deg, #dbeafe 0%, #bfdbfe 100%);
  color: #1e40af;
}

.alert-success {
  background: linear-gradient(135deg, #d1fae5 0%, #a7f3d0 100%);
  color: #065f46;
}

.alert-warning {
  background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
  color: #92400e;
}

.alert-danger {
  background: linear-gradient(135deg, #fee2e2 0%, #fecaca 100%);
  color: #991b1b;
}

/* Validation Styles */
.field-validation-error {
  color: #dc2626;
  font-size: 0.875rem;
  margin-top: 0.25rem;
  display: block;
}

.validation-summary-errors {
  background: linear-gradient(135deg, #fee2e2 0%, #fecaca 100%);
  border-radius: 0.75rem;
  padding: 1rem 1.25rem;
  margin-bottom: 1.5rem;
}

.validation-summary-errors ul {
  margin: 0;
  padding-left: 1.25rem;
  color: #991b1b;
}

/* Main Content Area */
main {
  min-height: 50vh;
}

/* Footer Styles */
.footer {
  position: relative;
  background: linear-gradient(to right, var(--darker-bg) 0%, var(--dark-bg) 100%);
  color: #d1d5db;
  padding: 2rem 0;
  border-top: none;
  margin-top: 3rem;
}

.footer a {
  color: #9ca3af;
  text-decoration: none;
  transition: color 0.2s ease-in-out;
}

.footer a:hover {
  color: white;
}

/* Utility Classes */
.text-gradient {
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

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

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

.rounded-modern {
  border-radius: 1rem;
}

/* Animations */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

/* Loading Spinner */
.spinner-border {
  border-color: var(--primary-color);
  border-right-color: transparent;
}

/* Responsive Adjustments */
@media (max-width: 767.98px) {
  h1 {
    font-size: 2rem;
  }

  .btn {
    width: 100%;
    margin-bottom: 0.5rem;
  }

  main {
    padding: 1rem 0;
  }
}