/* Dark Theme Variables */
:root {
  --bg-primary: #121212;
  --bg-secondary: #1e1e1e;
  --bg-tertiary: #2d2d2d;
  --text-primary: #ffffff;
  --text-secondary: #b3b3b3;
  --accent-primary: #bb86fc;
  --accent-secondary: #03dac6;
  --danger: #cf6679;
  --success: #4caf50;
  --warning: #ff9800;
}

/* Light Theme Variables */
:root.light-theme {
  --bg-primary: #ffffff !important;
  --bg-secondary: #f5f5f5 !important;
  --bg-tertiary: #e0e0e0 !important;
  --text-primary: #000000 !important;
  --text-secondary: #666666 !important;
  --accent-primary: #6200ee !important;
  --accent-secondary: #03dac6 !important;
  --danger: #b00020 !important;
  --success: #4caf50 !important;
  --warning: #ff9800 !important;
}

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

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
}

/* Utility Classes */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.btn {
  padding: 10px 20px;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-weight: 600;
  transition: all 0.3s ease;
}

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

.btn-primary:hover {
  background-color: #d0bcff;
}

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

.btn-secondary:hover {
  background-color: #3d3d3d;
}

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

.btn-danger:hover {
  background-color: #e57373;
}

/* Header */
header {
  background-color: var(--bg-secondary);
  padding: 1rem 0;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
}

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

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent-primary);
}

.nav-links {
  display: flex;
  list-style: none;
}

.nav-links li {
  margin-left: 1.5rem;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-primary);
  transition: color 0.3s ease;
}

.nav-links a:hover {
  color: var(--accent-primary);
}

/* Main Content */
main {
  min-height: calc(100vh - 120px);
  padding: 2rem 0;
}

/* Cards */
.card {
  background-color: var(--bg-secondary);
  border-radius: 8px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.card-title {
  font-size: 1.25rem;
  margin-bottom: 1rem;
  color: var(--accent-primary);
}

/* Forms */
.form-group {
  margin-bottom: 1rem;
}

.form-label {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--text-secondary);
}

.form-input {
  width: 100%;
  padding: 0.75rem;
  background-color: var(--bg-tertiary);
  border: 1px solid #424242;
  border-radius: 4px;
  color: var(--text-primary);
  font-size: 1rem;
}

.form-input:focus {
  outline: none;
  border-color: var(--accent-primary);
}

/* Exam Timer */
.timer {
  background-color: var(--bg-tertiary);
  padding: 0.5rem 1rem;
  border-radius: 4px;
  font-weight: bold;
  text-align: center;
  margin-bottom: 1rem;
}

.timer.warning {
  background-color: var(--warning);
  color: #000;
}

/* Progress Bar */
.progress-bar {
  display: flex;
  gap: 4px;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.progress-item {
  flex: 1;
  min-width: 30px;
  height: 30px;
  background-color: var(--bg-tertiary);
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: bold;
}

.progress-item.answered {
  background-color: var(--success);
  color: white;
}

.progress-item.visited {
  background-color: var(--accent-secondary);
  color: var(--bg-primary);
}

.progress-item.active {
  background-color: var(--accent-primary);
  color: var(--bg-primary);
  transform: scale(1.1);
  z-index: 1;
}

.progress-item.unanswered {
  background-color: var(--bg-tertiary);
  color: var(--text-secondary);
}

.progress-item.answered:hover {
  opacity: 0.8;
}

.progress-item.visited:hover {
  opacity: 0.8;
}

.progress-item.unanswered:hover {
  background-color: #3d3d3d;
}

/* Responsive Progress Bar */
@media (max-width: 768px) {
  .progress-item {
    min-width: 25px;
    height: 25px;
    font-size: 0.7rem;
  }
  
  .progress-bar {
    gap: 3px;
  }
}

@media (max-width: 480px) {
  .progress-item {
    min-width: 20px;
    height: 20px;
    font-size: 0.6rem;
  }
  
  .progress-bar {
    gap: 2px;
  }
}

/* Question */
.question-container {
  background-color: var(--bg-secondary);
  border-radius: 8px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

.question-number {
  font-weight: bold;
  color: var(--accent-primary);
  margin-bottom: 0.5rem;
}

.question-text {
  font-size: 1.1rem;
  margin-bottom: 1rem;
}

.options {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
}

.option {
  padding: 1rem;
  background-color: var(--bg-tertiary);
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.option:hover {
  background-color: #3d3d3d;
}

.option.selected {
  background-color: var(--accent-primary);
  color: var(--bg-primary);
}

/* Results */
.result-summary {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
}

.result-card {
  background-color: var(--bg-secondary);
  border-radius: 8px;
  padding: 1rem;
  text-align: center;
}

.result-value {
  font-size: 2rem;
  font-weight: bold;
  margin: 0.5rem 0;
}

.result-label {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.correct {
  color: var(--success);
}

.incorrect {
  color: var(--danger);
}

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

/* Responsive */
@media (max-width: 768px) {
  .container {
    padding: 0 15px;
  }
  
  .navbar {
    flex-direction: column;
    gap: 1rem;
  }
  
  .nav-links {
    margin-top: 1rem;
  }
  
  .nav-links li {
    margin: 0 0.5rem;
  }
  
  .result-summary {
    grid-template-columns: 1fr;
  }
}