/* ===== AI-Generated Component Responsive CSS =====
 * Created by: 콩미니 (Kong-mini)
 * Models: GPT-4.1 + Claude 3.5 Sonnet
 * Last Updated: 2026-02-24
 *
 * Policy: P1 (Device Agnosticism), P2 (No Essence Compromise)
 * Task: L4-9 (Component Integration)
 */

/* ===== Header Responsive ===== */
header {
  text-align: center;
  padding: var(--space-md);
}

@media (min-width: 768px) {
  header {
    text-align: left;
    padding: var(--space-lg);
  }
}

/* ===== Tab Navigation ===== */
.tabs {
  display: flex;
  flex-wrap: wrap;  /* Mobile: stack vertically */
  gap: var(--space-sm);
  padding: var(--space-sm);
  justify-content: center;
}

.tab-btn {
  flex: 1 1 auto;  /* Mobile: equal width */
  min-width: 80px;
  padding: var(--space-sm) var(--space-md);
  font-size: var(--font-size-sm);
}

@media (min-width: 768px) {
  .tabs {
    flex-wrap: nowrap;  /* Desktop: horizontal */
  }

  .tab-btn {
    flex: 0 1 auto;  /* Desktop: content width */
    font-size: var(--font-size-base);
  }
}

/* ===== Feature Cards ===== */
.feature-card {
  padding: var(--space-md);
  border-radius: 8px;
  background: white;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

@media (min-width: 768px) {
  .feature-card {
    padding: var(--space-lg);
  }
}

/* ===== Canvas Container ===== */
.canvas-container {
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 4;  /* Mobile: portrait */
  margin: var(--space-md) 0;
}

@media (min-width: 768px) {
  .canvas-container {
    aspect-ratio: 2 / 1;  /* Desktop: landscape */
  }
}

/* ===== Code Display ===== */
.code-display {
  background: #f5f5f5;
  border-radius: 8px;
  padding: var(--space-sm);
  overflow-x: auto;  /* Horizontal scroll if needed */
  font-size: var(--font-size-sm);
}

/* Mobile: wrap long lines */
@media (max-width: 767px) {
  .code-display pre {
    white-space: pre-wrap;  /* Wrap long lines */
    word-break: break-word;  /* Break words if needed */
  }
}

/* Desktop: horizontal scroll */
@media (min-width: 768px) {
  .code-display {
    padding: var(--space-md);
  }
}

/* ===== Quiz UI ===== */
.quiz-container {
  max-width: 100%;
  padding: var(--space-sm);
}

/* Option buttons */
.option-btn {
  width: 100%;
  min-height: var(--touch-target-min);
  padding: var(--space-md);
  margin-bottom: var(--space-sm);
  font-size: var(--font-size-base);
  text-align: left;
  border-radius: 8px;
  border: 2px solid #ddd;
  background: white;
  cursor: pointer;
  transition: all 0.2s;
}

.option-btn:hover {
  background: #f0f0f0;
}

.option-btn.selected {
  border-color: #2196F3;
  background: #E3F2FD;
}

.option-btn.correct {
  border-color: #4CAF50;
  background: #E8F5E9;
}

.option-btn.incorrect {
  border-color: #F44336;
  background: #FFEBEE;
}

/* ===== Progress Bar ===== */
.progress-bar {
  width: 100%;
  height: 8px;
  background: #e0e0e0;
  border-radius: 4px;
  overflow: hidden;
  margin: var(--space-sm) 0;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, #2196F3, #4CAF50);
  transition: width 0.3s ease;
}

/* ===== Feedback Modal ===== */
.quiz-feedback {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 90%;
  max-width: 500px;
  background: white;
  border-radius: 16px;
  box-shadow: 0 10px 40px rgba(0,0,0,0.2);
  z-index: 1000;
  padding: var(--space-lg);
}

@media (min-width: 768px) {
  .quiz-feedback {
    width: 60%;
    max-width: 600px;
  }
}

/* ===== Visualizer Controls ===== */
.visualizer-controls {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  padding: var(--space-md);
}

.control-btn {
  flex: 1 1 auto;
  min-width: 120px;
  min-height: var(--touch-target-min);
  padding: var(--space-sm) var(--space-md);
}

@media (min-width: 768px) {
  .visualizer-controls {
    flex-wrap: nowrap;
  }

  .control-btn {
    flex: 0 1 auto;
  }
}

/* ===== Struggles Section ===== */
.struggle-card {
  padding: var(--space-md);
  border-left: 4px solid #F44336;
  background: #FFEBEE;
  margin-bottom: var(--space-md);
}

.struggle-code {
  background: white;
  padding: var(--space-sm);
  border-radius: 4px;
  margin-top: var(--space-sm);
  font-size: var(--font-size-sm);
  overflow-x: auto;
}

/* ===== Footer ===== */
footer {
  text-align: center;
  padding: var(--space-lg) var(--space-md);
  font-size: var(--font-size-sm);
  color: #666;
}

@media (min-width: 768px) {
  footer {
    padding: var(--space-xl) var(--space-lg);
  }
}

/* ===== Utility Classes ===== */
.hidden {
  display: none !important;
}

.text-center {
  text-align: center;
}

.mt-md {
  margin-top: var(--space-md);
}

.mb-md {
  margin-bottom: var(--space-md);
}

/* ===== Accessibility (Review-7) ===== */
@media (prefers-reduced-motion: reduce) {
  .option-btn,
  .control-btn {
    transition: none;
  }
}

/* Focus visible for keyboard navigation */
button:focus-visible,
.option-btn:focus-visible {
  outline: 3px solid #2196F3;
  outline-offset: 2px;
}

/* ===== Loading Spinner ===== */
.spinner {
  width: 40px;
  height: 40px;
  border: 4px solid #f3f3f3;
  border-top: 4px solid #2196F3;
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: var(--space-lg) auto;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

@media (prefers-reduced-motion: reduce) {
  .spinner {
    animation: none;
  }
}