/* Variables */
:root {
  --primary-color: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #3b82f6;
  --secondary-color: #0ea5e9;
  --accent-color: #f97316;
  --success-color: #10b981;
  --warning-color: #f59e0b;
  --error-color: #ef4444;
  --neutral-100: #f3f4f6;
  --neutral-200: #e5e7eb;
  --neutral-300: #d1d5db;
  --neutral-400: #9ca3af;
  --neutral-500: #6b7280;
  --neutral-600: #4b5563;
  --neutral-700: #374151;
  --neutral-800: #1f2937;
  --neutral-900: #111827;
  --white: #ffffff;
  --black: #000000;
  --body-font: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  --heading-font: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  --border-radius: 8px;
  --box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --transition: all 0.3s ease;
}

/* Reset */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* Base Styles */
html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--body-font);
  line-height: 1.5;
  color: var(--neutral-800);
  background-color: var(--neutral-100);
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--heading-font);
  line-height: 1.2;
  color: var(--neutral-900);
  margin-bottom: 1rem;
}

h1 {
  font-size: 2rem;
}

h2 {
  font-size: 1.75rem;
}

h3 {
  font-size: 1.5rem;
}

h4 {
  font-size: 1.25rem;
}

p {
  margin-bottom: 1rem;
}

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

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

ul, ol {
  margin-bottom: 1rem;
  padding-left: 1.5rem;
}

img {
  max-width: 100%;
  height: auto;
}

/* Layout */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

.row {
  display: flex;
  flex-wrap: wrap;
  margin: 0 -1rem;
}

.col {
  flex: 1;
  padding: 0 1rem;
}

/* Cards */
.card {
  background-color: var(--white);
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow);
  margin-bottom: 1.5rem;
  overflow: hidden;
}

.card-header {
  padding: 1rem;
  background-color: var(--primary-color);
  color: var(--white);
}

.card-body {
  padding: 1.5rem;
}

.card-footer {
  padding: 1rem;
  background-color: var(--neutral-100);
  border-top: 1px solid var(--neutral-200);
}

/* Forms */
.form-group {
  margin-bottom: 1.5rem;
}

label {
  display: block;
  margin-bottom: 0.5rem;
  font-size: 1.1rem;
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
input[type="date"],
input[type="time"],
select,
textarea {
  width: 100%;
  padding: 0.75rem;
  font-size: 1.1rem;
  border: 1px solid var(--neutral-300);
  border-radius: var(--border-radius);
  background-color: var(--white);
  transition: var(--transition);
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="password"]:focus,
input[type="number"]:focus,
input[type="date"]:focus,
input[type="time"]:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: var(--primary-light);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.25);
}

.form-check {
  display: flex;
  align-items: center;
  margin-bottom: 0.5rem;
}

.form-check input {
  margin-right: 0.5rem;
}

small {
  display: block;
  margin-top: 0.25rem;
  color: var(--neutral-500);
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.75rem 1.25rem;
  font-size: 1rem;
  font-weight: 500;
  text-align: center;
  text-decoration: none;
  border: none;
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: var(--transition);
}

.btn:hover {
  text-decoration: none;
}

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

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

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

.btn-secondary:hover {
  background-color: #0284c7;
  color: var(--white);
}

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

.btn-success:hover {
  background-color: #059669;
  color: var(--white);
}

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

.btn-danger:hover {
  background-color: #dc2626;
  color: var(--white);
}

.btn-outline {
  background-color: transparent;
  border: 1px solid var(--primary-color);
  color: var(--primary-color);
}

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

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
}

.btn-lg {
  padding: 1rem 1.5rem;
  font-size: 1.125rem;
}

.btn-block {
  display: block;
  width: 100%;
}

/* Alerts */
.alert {
  padding: 1rem;
  margin-bottom: 1.5rem;
  border-radius: var(--border-radius);
}

.alert-success {
  background-color: #d1fae5;
  color: #065f46;
  border: 1px solid #a7f3d0;
}

.alert-danger {
  background-color: #fee2e2;
  color: #b91c1c;
  border: 1px solid #fecaca;
}

.alert-warning {
  background-color: #fff7ed;
  color: #c2410c;
  border: 1px solid #fed7aa;
}

.alert-info {
  background-color: #e0f2fe;
  color: #075985;
  border: 1px solid #bae6fd;
}

/* Tables */
.table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1.5rem;
}

.table th,
.table td {
  padding: 0.75rem;
  text-align: left;
  border-bottom: 1px solid var(--neutral-200);
}

.table th {
  background-color: var(--neutral-100);
  font-weight: 600;
}

.table tbody tr:hover {
  background-color: var(--neutral-100);
}

/* Navigation */
.navbar {
  background-color: var(--primary-color);
  color: var(--white);
  padding: 1rem 0;
  margin-bottom: 2rem;
}

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

.navbar-brand {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--white);
  text-decoration: none;
}

.navbar-brand:hover {
  color: var(--white);
  text-decoration: none;
}

.navbar-nav {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-item {
  margin-left: 1.5rem;
}

.nav-link {
  color: var(--white);
  text-decoration: none;
  padding: 0.5rem 0;
  transition: var(--transition);
}

.nav-link:hover {
  color: var(--neutral-200);
  text-decoration: none;
}

.navbar-toggler {
  display: none;
  background: transparent;
  border: none;
  color: var(--white);
  font-size: 1.5rem;
  cursor: pointer;
}

/* Login & Register */
.login-container, .register-container {
  max-width: 500px;
  margin: 3rem auto;
  background-color: var(--white);
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow);
  padding: 2rem;
}

.login-header, .register-header {
  text-align: center;
  margin-bottom: 2rem;
}

.login-header h1, .register-header h1 {
  color: var(--primary-color);
  margin-bottom: 0.5rem;
}

.login-form, .register-form {
  margin-bottom: 1rem;
}

.form-footer {
  text-align: center;
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--neutral-200);
}

/* Footer */
.main-footer {
  background-color: var(--neutral-800);
  color: var(--white);
  padding: 2rem 0;
  margin-top: 3rem;
}

.main-footer a {
  color: var(--neutral-300);
}

.main-footer a:hover {
  color: var(--white);
}

/* Dashboard */
.dashboard-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
}

.dashboard-title {
  margin-bottom: 0;
}

.dashboard-cards {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.dashboard-card {
  background-color: var(--white);
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow);
  padding: 1.5rem;
  transition: var(--transition);
}

.dashboard-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

.dashboard-card-icon {
  font-size: 2rem;
  color: var(--primary-color);
  margin-bottom: 1rem;
}

.dashboard-card-title {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}

.dashboard-card-value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--primary-color);
}

/* Exam Interface */
.exam-header {
  background-color: var(--primary-color);
  color: var(--white);
  padding: 1rem;
  margin-bottom: 2rem;
  border-radius: var(--border-radius);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.exam-title {
  margin-bottom: 0;
}

.exam-timer {
  font-size: 1.25rem;
  font-weight: 700;
  background-color: var(--white);
  color: var(--neutral-800);
  padding: 0.5rem 1rem;
  border-radius: var(--border-radius);
}

.question-container {
  background-color: var(--white);
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow);
  padding: 2rem;
  margin-bottom: 2rem;
}

.question-text {
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
}

.question-options {
  margin-bottom: 1.5rem;
}

.option-item {
  margin-bottom: 0.75rem;
}

.option-item label {
  font-size: 1.25rem;
}

.question-navigation {
  display: flex;
  justify-content: space-between;
  margin-top: 2rem;
}

.question-indicator {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2rem;
}

.question-number {
  width: 2.5rem;
  height: 2.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--neutral-200);
  border-radius: 50%;
  cursor: pointer;
  transition: var(--transition);
}

.question-number:hover {
  background-color: var(--primary-light);
  color: var(--white);
}

.question-number.active {
  background-color: var(--primary-color);
  color: var(--white);
}

.question-number.answered {
  background-color: var(--success-color);
  color: var(--white);
}

.question-number.flagged {
  background-color: var(--warning-color);
  color: var(--white);
}

/* Responsive Styles */
@media (max-width: 992px) {
  .dashboard-cards {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .navbar-nav {
    display: none;
    flex-direction: column;
    width: 100%;
    padding: 1rem 0;
  }
  
  .navbar-nav.show {
    display: flex;
  }
  
  .nav-item {
    margin: 0 0 0.5rem 0;
  }
  
  .navbar-container {
    flex-wrap: wrap;
  }
  
  .navbar-toggler {
    display: block;
  }
  
  .dashboard-header {
    flex-direction: row;
    justify-content: space-between;
  }
  
  .dashboard-title {
    margin-bottom: 1rem;
  }
  
  .exam-header {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .exam-timer {
    margin-top: 1rem;
  }
}

@media (max-width: 576px) {
  .container {
    padding: 0 0.5rem;
  }

  .dashboard-cards {
    grid-template-columns: 1fr;
  }

  .login-container, .register-container {
    padding: 1.5rem;
  }

  .question-navigation {
    flex-direction: column;
    gap: 1rem;
  }

  .btn-block-sm {
    display: block;
    width: 100%;
  }
}

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

.fade-in {
  animation: fadeIn 0.3s ease;
}

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

.slide-in-right {
  animation: slideInRight 0.3s ease;
}

/* Question Type Specific Styles */
.drag-drop-container {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  margin-bottom: 2rem;
}

.drag-items, .drop-targets {
  flex: 1;
  background-color: var(--neutral-100);
  padding: 1rem;
  border-radius: var(--border-radius);
  min-height: 200px;
}

.drag-item, .drop-target {
  background-color: var(--white);
  padding: 0.75rem;
  margin-bottom: 0.5rem;
  border-radius: var(--border-radius);
  cursor: move;
  transition: var(--transition);
  font-size: 1.1rem;
}

.drag-item:hover {
  background-color: var(--neutral-200);
}

.drop-target {
  border: 2px dashed var(--neutral-300);
  display: flex;
  align-items: center;
  min-height: 3rem;
}

.drop-target.hover {
  border-color: var(--primary-color);
  background-color: rgba(37, 99, 235, 0.1);
}

.true-false-options {
  display: flex;
  gap: 1rem;
}

.true-false-option {
  flex: 1;
  padding: 1rem;
  text-align: center;
  border: 2px solid var(--neutral-300);
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: var(--transition);
  font-size: 1.1rem;
}

.true-false-option:hover {
  border-color: var(--primary-color);
}

.true-false-option.selected {
  background-color: var(--primary-color);
  color: var(--white);
  border-color: var(--primary-color);
}

/* Accessibility */
.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;
}

:focus {
  outline: 3px solid rgba(59, 130, 246, 0.5);
  outline-offset: 2px;
}

:focus:not(:focus-visible) {
  outline: none;
}

:focus-visible {
  outline: 3px solid rgba(59, 130, 246, 0.5);
  outline-offset: 2px;
}

.col-max-score {
  width: 80px;
  text-align: center;
}

.col-mark {
  width: 85px;
  text-align: center;
}

/* Matching Question Detailed Result Styles */
.matching-result {
  margin-top: 1rem;
}

.matching-pairs {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem 2rem;
  justify-content: flex-start;
}

.matching-pair {
  background-color: var(--white);
  border: 1px solid var(--neutral-300);
  border-radius: var(--border-radius);
  padding: 1rem;
  width: 280px;
  box-shadow: var(--box-shadow);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.matching-pair.correct-pair {
  border-color: var(--success-color);
  background-color: #d1fae5;
}

.matching-pair.incorrect-pair {
  border-color: var(--error-color);
  background-color: #fee2e2;
}

.left-item {
  color: var(--neutral-800);
}

.matching-arrows {
  display: flex;
  gap: 1rem;
  align-items: center;
}

.user-arrow, .correct-arrow {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.9rem;
  color: var(--neutral-600);
}

.right-items {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.user-match {
  color: var(--neutral-800);
}

.correct-match {
  font-style: italic;
  color: var(--success-color);
}

/* Add styles for matching pairs side by side in add_questions.php */
.matching-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}

.matching-row input[type="text"] {
  flex: 1 1 40%;
  padding: 6px 8px;
  font-size: 1rem;
  border: 1px solid var(--neutral-300);
  border-radius: var(--border-radius);
}

.matching-arrow {
  flex: 0 0 40px;
  text-align: center;
  font-size: 1.2rem;
  color: var(--neutral-600);
}

.remove-matching {
  flex: 0 0 auto;
  margin-left: 10px;
}