/* Base Styles & Variables */
:root {
  --bg-color: #0a0a12;
  --text-color: #e0e0ff;
  --accent-orange: #ff6b35;
  --accent-orange-glow: rgba(255, 107, 53, 0.5);
  --glass-bg: rgba(255, 255, 255, 0.05);
  --glass-border: rgba(255, 255, 255, 0.1);
  --card-bg: rgba(255, 255, 255, 0.03);
  --success-color: #00cc66;
  --error-color: #ff3333;
}

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

body {
  font-family: 'Outfit', sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  min-height: 100vh;
  padding: 20px;
  line-height: 1.6;
  overflow-x: hidden;
}

/* Background Effects (Copied from main styles) */
.background-gradient {
  position: fixed;
  inset: 0;
  background: radial-gradient(ellipse at 20% 80%, rgba(255, 107, 53, 0.05) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(255, 107, 53, 0.05) 0%, transparent 50%),
    linear-gradient(to bottom, #0a0a12, #0f0f1a 50%, #0a0a12);
  z-index: 1;
}

.stars-container {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 3;
}

.star {
  position: absolute;
  width: 2px;
  height: 2px;
  background: #fff;
  border-radius: 50%;
  animation: star-twinkle var(--duration, 3s) infinite ease-in-out;
}

@keyframes star-twinkle {
  0%, 100% { opacity: 0.3; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.2); }
}

.ember-container {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 10;
}

.ember-particle {
  position: absolute;
  bottom: 0;
  width: 3px;
  height: 3px;
  background: radial-gradient(circle, #ff6b35, #ff4500);
  border-radius: 50%;
  animation: ember-rise var(--duration, 10s) infinite ease-in;
  opacity: 0;
  box-shadow: 0 0 6px #ff6b35, 0 0 12px #ff4500;
}

@keyframes ember-rise {
  0% { transform: translateY(0) translateX(0) scale(1); opacity: 0; }
  10% { opacity: 0.8; }
  50% { opacity: 0.6; }
  90% { opacity: 0.2; }
  100% { transform: translateY(-100vh) translateX(calc(var(--drift, 20px))) scale(0.5); opacity: 0; }
}

/* Layout */
.container {
  max-width: 900px;
  margin: 0 auto;
  position: relative;
  z-index: 20;
}

header {
  text-align: center;
  margin-bottom: 2rem;
  padding: 2rem;
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  border-radius: 24px;
}

h1 {
  font-family: 'Orbitron', sans-serif;
  color: var(--accent-orange);
  font-size: 2.5rem;
  margin-bottom: 1rem;
  text-transform: uppercase;
  letter-spacing: 4px;
  background: linear-gradient(135deg, #fff, var(--accent-orange));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.stats {
  display: flex;
  justify-content: center;
  gap: 2rem;
  font-size: 1rem;
  color: rgba(255, 255, 255, 0.7);
  font-weight: 600;
  letter-spacing: 1px;
}

/* Cards & Sections */
.work-selection, .category-selection, .import-export-section, .quiz-container, .completion-screen {
  background: var(--glass-bg);
  backdrop-filter: blur(15px);
  border: 1px solid var(--glass-border);
  padding: 2.5rem;
  border-radius: 24px;
  margin-bottom: 2rem;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
}

h3 {
  font-family: 'Orbitron', sans-serif;
  color: #fff;
  margin-bottom: 1.5rem;
  text-align: center;
  font-size: 1.2rem;
  letter-spacing: 2px;
}

/* Buttons */
.work-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}

.work-btn {
  padding: 12px 24px;
  border: 1px solid var(--glass-border);
  border-radius: 99px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  background: rgba(255, 255, 255, 0.05);
  color: #fff;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.work-btn:hover {
  background: rgba(255, 107, 53, 0.15);
  border-color: var(--accent-orange);
  transform: translateY(-2px);
}

.work-btn.active {
  background: var(--accent-orange);
  color: #000;
  border-color: var(--accent-orange);
  box-shadow: 0 0 15px var(--accent-orange-glow);
}

.start-test-btn {
  width: 100%;
  padding: 1.2rem;
  border: none;
  border-radius: 99px;
  font-family: 'Orbitron', sans-serif;
  font-size: 1.2rem;
  font-weight: 700;
  cursor: pointer;
  background: var(--accent-orange);
  color: #000;
  transition: all 0.3s ease;
  margin-top: 1.5rem;
  box-shadow: 0 0 20px var(--accent-orange-glow);
  text-transform: uppercase;
  letter-spacing: 2px;
}

.start-test-btn:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 0 30px var(--accent-orange);
}

/* Checkboxes */
.category-checkboxes {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin-bottom: 1rem;
}

.checkbox-label {
  display: flex;
  align-items: center;
  cursor: pointer;
  font-size: 1rem;
  color: #fff;
  user-select: none;
  padding: 1rem;
  background: rgba(255, 255, 255, 0.03);
  border-radius: 12px;
  border: 1px solid var(--glass-border);
  transition: all 0.3s ease;
}

.checkbox-label:hover {
  background: rgba(255, 255, 255, 0.07);
}

.checkbox-label input[type="checkbox"] {
  display: none;
}

.checkmark {
  height: 22px;
  width: 22px;
  background-color: rgba(0, 0, 0, 0.3);
  border: 2px solid var(--glass-border);
  border-radius: 6px;
  margin-right: 15px;
  position: relative;
  transition: all 0.2s ease;
}

.checkbox-label input:checked ~ .checkmark {
  background-color: var(--accent-orange);
  border-color: var(--accent-orange);
}

.checkbox-label input:checked ~ .checkmark::after {
  content: "✓";
  position: absolute;
  color: #000;
  font-size: 16px;
  font-weight: 900;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.checkbox-label input:checked ~ span:not(.checkmark) {
    color: var(--accent-orange);
}

/* Import/Export */
.import-export-buttons {
  display: flex;
  flex-direction: row;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
}

.import-export-btn {
  flex: 1;
  min-width: 150px;
  padding: 12px;
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  background: rgba(255, 255, 255, 0.05);
  color: #fff;
  transition: all 0.3s ease;
}

.import-export-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  transform: translateY(-2px);
}

#exportTemplateBtn { background: rgba(102, 51, 0, 0.3); border-color: #996633; }
#exportDataBtn { background: rgba(0, 102, 51, 0.3); border-color: #009966; }
#importDataBtn { background: rgba(51, 0, 102, 0.3); border-color: #663399; }

/* Quiz Controls */
.controls {
  display: flex;
  gap: 12px;
  margin-bottom: 2rem;
  justify-content: center;
}

.control-btn {
  padding: 10px 20px;
  border: 1px solid var(--glass-border);
  border-radius: 99px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  background: var(--glass-bg);
  color: #fff;
  transition: all 0.3s ease;
}

.control-btn:hover {
  background: rgba(255, 255, 255, 0.1);
}

.control-btn.active {
  background: #fff;
  color: #000;
}

.reset-btn {
  color: var(--error-color);
  border-color: var(--error-color);
}

.reset-btn:hover {
  background: rgba(255, 51, 51, 0.1);
}

/* Question Card */
.question-card h2 {
  font-size: 1.5rem;
  margin-bottom: 2rem;
  text-align: center;
  color: #fff;
  font-weight: 600;
}

.answers-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 15px;
  margin-bottom: 2rem;
}

.answer-option {
  padding: 1.2rem;
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.03);
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  font-size: 1.1rem;
  text-align: center;
  color: #fff;
}

.answer-option:hover {
  border-color: var(--accent-orange);
  background: rgba(255, 107, 53, 0.05);
  transform: scale(1.02);
}

.answer-option.selected {
  border-color: var(--accent-orange);
  background: rgba(255, 107, 53, 0.1);
}

.answer-option.correct {
  border-color: var(--success-color);
  background: rgba(0, 204, 102, 0.1);
  color: var(--success-color);
  box-shadow: 0 0 15px rgba(0, 204, 102, 0.2);
}

.answer-option.incorrect {
  border-color: var(--error-color);
  background: rgba(255, 51, 51, 0.1);
  color: var(--error-color);
  box-shadow: 0 0 15px rgba(255, 51, 51, 0.2);
}

/* Feedback & Navigation */
.feedback {
  padding: 1.5rem;
  border-radius: 16px;
  margin-bottom: 2rem;
  font-weight: 700;
  text-align: center;
  font-size: 1.1rem;
}

.feedback.correct {
  background: rgba(0, 204, 102, 0.1);
  color: var(--success-color);
  border: 1px solid var(--success-color);
}

.feedback.incorrect {
  background: rgba(255, 51, 51, 0.1);
  color: var(--error-color);
  border: 1px solid var(--error-color);
}

.navigation {
  display: flex;
  justify-content: space-between;
  gap: 15px;
}

.nav-btn {
  flex: 1;
  padding: 1rem;
  border: 1px solid var(--glass-border);
  border-radius: 99px;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  background: var(--glass-bg);
  color: #fff;
  transition: all 0.3s ease;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.nav-btn:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.1);
  border-color: #fff;
}

.nav-btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

.star-btn {
  flex: 0 0 60px;
  font-size: 1.5rem;
}

.star-btn.starred {
  color: #ffcc00;
  text-shadow: 0 0 10px rgba(255, 204, 0, 0.5);
}

/* Completion Screen */
.completion-screen h2 {
  color: var(--success-color);
  font-family: 'Orbitron', sans-serif;
  font-size: 2.5rem;
  margin-bottom: 1.5rem;
}

.completion-screen p {
  font-size: 1.5rem;
  margin-bottom: 2.5rem;
}

.restart-btn {
  padding: 1.2rem 3rem;
  border-radius: 99px;
  font-family: 'Orbitron', sans-serif;
  background: var(--accent-orange);
  color: #000;
  font-weight: 700;
  border: none;
  cursor: pointer;
  transition: all 0.3s ease;
}

.restart-btn:hover {
  transform: scale(1.05);
  box-shadow: 0 0 20px var(--accent-orange);
}

.hidden { display: none !important; }

/* Mobile responsiveness */
@media (max-width: 768px) {
  h1 { font-size: 1.8rem; }
  .answers-container { grid-template-columns: 1fr; }
  .container { padding: 10px; }
  .stats { flex-direction: column; align-items: center; gap: 0.5rem; }
  
  .work-selection-container {
    width: 95%;
    padding: 1.5rem;
  }
  
  .work-grid {
    flex-direction: column;
    gap: 10px;
  }
  
  .work-btn {
    width: 100%;
    padding: 0.8rem;
    font-size: 0.9rem;
  }

  .question-container {
    padding: 1.5rem;
  }

  .question-text {
    font-size: 1.2rem;
  }
  
  .category-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  h1 { font-size: 1.5rem; }
  .completion-screen h2 { font-size: 1.8rem; }
  .completion-screen p { font-size: 1.2rem; }
  .nav-btn { font-size: 0.8rem; padding: 0.8rem; }
}