/* ============================================
   AI Tutor Demo - Stevens Institute Branding
   ============================================ */

:root {
  /* Stevens Brand Colors */
  --stevens-red: #9E1B34;
  --stevens-navy: #1E3A5F;
  --accent-white: #FFFFFF;
  --bg-light: #F8F9FA;
  --bg-dark: #0D1117;

  /* UI Colors */
  --text-primary: #1a1a2e;
  --text-secondary: #4a4a6a;
  --text-muted: #8a8aa0;
  --border-color: #e0e0e8;
  --success-color: #22c55e;
  --warning-color: #f59e0b;
  --error-color: #ef4444;

  /* Classification Colors */
  --correct-color: #22c55e;
  --conceptual-color: #f97316;
  --attention-color: #eab308;
  --uncertain-color: #6b7280;

  /* Animation Timing */
  --transition-fast: 150ms;
  --transition-normal: 300ms;
  --transition-slow: 400ms;

  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;

  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Consolas', monospace;
}

/* ============================================
   Reset & Base
   ============================================ */

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

html, body {
  height: 100%;
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.5;
  color: var(--text-primary);
  background: var(--bg-light);
  overflow: hidden;
}

.hidden {
  display: none !important;
}

/* ============================================
   Modal (API Key Input)
   ============================================ */

.modal {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  z-index: 1000;
}

.modal-content {
  background: var(--accent-white);
  padding: var(--spacing-xl);
  border-radius: 12px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  max-width: 400px;
  width: 90%;
  text-align: center;
}

.modal-content h2 {
  color: var(--stevens-navy);
  margin-bottom: var(--spacing-md);
  font-size: 1.5rem;
}

.modal-content p {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-lg);
  font-size: 0.95rem;
}

.modal-content input {
  width: 100%;
  padding: var(--spacing-md);
  border: 2px solid var(--border-color);
  border-radius: 8px;
  font-size: 1rem;
  font-family: var(--font-mono);
  transition: border-color var(--transition-fast);
}

.modal-content input:focus {
  outline: none;
  border-color: var(--stevens-red);
}

.modal-error {
  color: var(--error-color);
  font-size: 0.875rem;
  margin-top: var(--spacing-sm);
  min-height: 1.5em;
}

.btn-primary {
  width: 100%;
  margin-top: var(--spacing-lg);
  padding: var(--spacing-md) var(--spacing-xl);
  background: var(--stevens-red);
  color: var(--accent-white);
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.btn-primary:hover {
  background: #b91c3a;
}

.btn-primary:active {
  transform: scale(0.98);
}

.btn-primary:disabled {
  background: var(--text-muted);
  cursor: not-allowed;
}

/* ============================================
   Main App Layout
   ============================================ */

#app {
  display: flex;
  flex-direction: column;
  height: 100vh;
  padding: var(--spacing-lg);
  gap: var(--spacing-lg);
}

/* ============================================
   Main Content Area
   ============================================ */

#main-content {
  flex: 1;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-white);
  border-radius: 16px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  overflow: hidden;
}

/* View Switching */
.view {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-slow), visibility var(--transition-slow), transform var(--transition-slow);
  transform: scale(0.98);
}

.view.active {
  opacity: 1;
  visibility: visible;
  transform: scale(1);
}

/* ============================================
   Waveform View
   ============================================ */

#waveform-view {
  flex-direction: column;
  gap: var(--spacing-lg);
}

#waveform-canvas {
  width: 80%;
  max-width: 600px;
  height: 150px;
}

#listening-indicator {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  color: var(--text-secondary);
  font-size: 0.9rem;
}

#listening-indicator .pulse {
  width: 12px;
  height: 12px;
  background: var(--stevens-red);
  border-radius: 50%;
  animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 0.4; transform: scale(0.9); }
  50% { opacity: 1; transform: scale(1.1); }
}

/* ============================================
   Video View (Stage 2 Placeholder)
   ============================================ */

#video-view {
  background: var(--bg-dark);
}

#video-placeholder {
  color: var(--text-muted);
  font-size: 1.5rem;
  font-style: italic;
}

/* ============================================
   Problem View
   ============================================ */

#problem-view {
  align-items: flex-start;
  padding: var(--spacing-xl);
  overflow-y: auto;
}

#problem-container {
  width: 100%;
  max-width: 800px;
  margin: 0 auto;
}

#problem-header {
  border-bottom: 3px solid var(--stevens-red);
  padding-bottom: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
}

.problem-label {
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--stevens-red);
}

#problem-statement {
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--text-primary);
  margin-bottom: var(--spacing-xl);
  padding: var(--spacing-lg);
  background: var(--bg-light);
  border-radius: 8px;
  border-left: 4px solid var(--stevens-navy);
}

#solution-area h3 {
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
}

#steps-container {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.step-item {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  background: var(--bg-light);
  border-radius: 8px;
  border-left: 4px solid var(--border-color);
  opacity: 0;
  transform: translateY(10px);
  animation: stepFadeIn var(--transition-slow) ease-out forwards;
}

@keyframes stepFadeIn {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.step-item.correct {
  border-left-color: var(--success-color);
}

.step-item.retry {
  border-left-color: var(--warning-color);
}

.step-number {
  font-weight: 600;
  color: var(--text-muted);
  white-space: nowrap;
}

.step-content {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.step-name {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.step-math {
  font-size: 1.1rem;
}

.step-status {
  font-size: 1.25rem;
  color: var(--success-color);
}

#current-step-indicator {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md);
  color: var(--text-muted);
  font-size: 0.95rem;
}

#current-step-indicator .cursor {
  animation: blink 1s step-end infinite;
  color: var(--stevens-red);
}

@keyframes blink {
  50% { opacity: 0; }
}

#problem-complete {
  margin-top: var(--spacing-xl);
  padding: var(--spacing-lg);
  text-align: center;
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--success-color);
  background: rgba(34, 197, 94, 0.1);
  border-radius: 8px;
  border: 2px solid var(--success-color);
}

#problem-complete .checkmark {
  font-size: 1.5rem;
}

/* ============================================
   Loading Overlay
   ============================================ */

#loading-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-md);
  background: rgba(255, 255, 255, 0.95);
  z-index: 10;
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border-color);
  border-top-color: var(--stevens-red);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

#loading-text {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* ============================================
   Dialogue Area (Chat Window)
   ============================================ */

#dialogue-area {
  background: var(--accent-white);
  border-radius: 12px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
  max-height: 180px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

#dialogue-messages {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing-md) var(--spacing-lg);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  scroll-behavior: smooth;
}

/* Hide scrollbar but keep functionality */
#dialogue-messages::-webkit-scrollbar {
  width: 4px;
}

#dialogue-messages::-webkit-scrollbar-track {
  background: transparent;
}

#dialogue-messages::-webkit-scrollbar-thumb {
  background: var(--stevens-gray);
  border-radius: 2px;
}

.dialogue-message {
  color: var(--text-primary);
  font-size: 1rem;
  line-height: 1.5;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: 8px;
  opacity: 0;
  transform: translateY(10px);
  animation: messageIn 0.3s ease-out forwards;
}

.dialogue-message.ai {
  background: linear-gradient(135deg, var(--stevens-red-light) 0%, #fce8e8 100%);
  border-left: 3px solid var(--stevens-red);
  align-self: flex-start;
  max-width: 90%;
}

.dialogue-message.user {
  background: var(--bg-tertiary);
  border-left: 3px solid var(--stevens-gray);
  align-self: flex-end;
  max-width: 90%;
  font-style: italic;
  color: var(--text-secondary);
}

.dialogue-message.typing {
  background: linear-gradient(135deg, var(--stevens-red-light) 0%, #fce8e8 100%);
  border-left: 3px solid var(--stevens-red);
  opacity: 0.7;
}

@keyframes messageIn {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ============================================
   Status Area
   ============================================ */

#status-area {
  text-align: center;
  padding: var(--spacing-sm);
  min-height: 30px;
}

#status-text {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ============================================
   Calendar Notification
   ============================================ */

.notification {
  position: fixed;
  top: var(--spacing-lg);
  right: var(--spacing-lg);
  width: 320px;
  background: var(--accent-white);
  border-radius: 12px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
  overflow: hidden;
  transform: translateX(120%);
  opacity: 0;
  transition: transform var(--transition-slow) ease-out, opacity var(--transition-slow);
  z-index: 100;
}

.notification.visible {
  transform: translateX(0);
  opacity: 1;
}

.notification-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md);
  background: var(--stevens-navy);
  color: var(--accent-white);
}

.notification-icon {
  font-size: 1.2rem;
}

.notification-title {
  font-weight: 600;
}

.notification-body {
  padding: var(--spacing-md);
}

.event-name {
  font-weight: 600;
  font-size: 1.1rem;
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
}

.event-time {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
}

.event-details {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
  font-size: 0.9rem;
  color: var(--text-muted);
}

.event-location::before {
  content: '📍 ';
}

.event-reminder::before {
  content: '🔔 Reminder: ';
}

/* ============================================
   Presenter Controls
   ============================================ */

#presenter-controls {
  position: fixed;
  bottom: var(--spacing-lg);
  left: var(--spacing-lg);
  width: 320px;
  background: rgba(30, 58, 95, 0.95);
  backdrop-filter: blur(8px);
  border-radius: 12px;
  padding: var(--spacing-md);
  color: var(--accent-white);
  font-size: 0.875rem;
  z-index: 200;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

.presenter-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-md);
  padding-bottom: var(--spacing-sm);
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

.presenter-title {
  font-weight: 600;
}

.presenter-hint {
  font-size: 0.75rem;
  opacity: 0.7;
}

#presenter-step-info {
  margin-bottom: var(--spacing-md);
}

#presenter-step-info .step-name {
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
  color: var(--accent-white);
}

#presenter-step-info .transcript {
  font-size: 0.8rem;
  opacity: 0.8;
  font-style: italic;
  max-height: 40px;
  overflow: hidden;
  text-overflow: ellipsis;
}

#presenter-classification {
  margin-bottom: var(--spacing-md);
}

.classification-result {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
}

.classification-label {
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: 4px;
  font-weight: 600;
  font-size: 0.8rem;
  text-transform: uppercase;
}

.classification-label.correct {
  background: var(--correct-color);
  color: white;
}

.classification-label.conceptual {
  background: var(--conceptual-color);
  color: white;
}

.classification-label.attention {
  background: var(--attention-color);
  color: black;
}

.classification-label.uncertain {
  background: var(--uncertain-color);
  color: white;
}

.confidence {
  font-size: 0.75rem;
  opacity: 0.8;
}

.classification-timer {
  height: 4px;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 2px;
  overflow: hidden;
}

.timer-bar {
  height: 100%;
  background: var(--correct-color);
  width: 100%;
  transition: width linear;
}

.presenter-hotkeys {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-md);
}

.presenter-hotkeys .hotkey {
  padding: var(--spacing-sm);
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 6px;
  color: var(--accent-white);
  font-size: 0.7rem;
  cursor: pointer;
  transition: background var(--transition-fast);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}

.presenter-hotkeys .hotkey:hover {
  background: rgba(255, 255, 255, 0.2);
}

.presenter-hotkeys .hotkey .key {
  font-weight: 700;
  font-size: 0.9rem;
}

.presenter-scene-controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--spacing-sm);
  border-top: 1px solid rgba(255, 255, 255, 0.2);
}

.scene-label {
  font-size: 0.8rem;
  opacity: 0.8;
}

#current-scene-display {
  font-weight: 600;
}

.scene-nav {
  display: flex;
  gap: var(--spacing-xs);
}

.nav-btn {
  padding: var(--spacing-xs) var(--spacing-sm);
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 4px;
  color: var(--accent-white);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  cursor: pointer;
  transition: background var(--transition-fast);
}

.nav-btn:hover {
  background: rgba(255, 255, 255, 0.2);
}

.presenter-debug {
  margin-top: var(--spacing-sm);
  padding-top: var(--spacing-sm);
  border-top: 1px solid rgba(255, 255, 255, 0.2);
}

.debug-btn {
  width: 100%;
  padding: var(--spacing-xs) var(--spacing-sm);
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 4px;
  color: var(--accent-white);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  cursor: pointer;
  transition: background var(--transition-fast);
}

.debug-btn:hover {
  background: rgba(255, 255, 255, 0.2);
}

/* ============================================
   Presenter Hint (when controls hidden)
   ============================================ */

#presenter-hint {
  position: fixed;
  bottom: var(--spacing-lg);
  left: var(--spacing-lg);
  padding: var(--spacing-xs) var(--spacing-sm);
  background: rgba(30, 58, 95, 0.6);
  border-radius: 6px;
  color: var(--accent-white);
  font-size: 0.75rem;
  opacity: 0.5;
  transition: opacity var(--transition-fast);
  z-index: 199;
}

#presenter-hint:hover {
  opacity: 1;
}

.hint-key {
  font-family: var(--font-mono);
}

/* ============================================
   Stevens Logo
   ============================================ */

#stevens-logo {
  position: fixed;
  bottom: var(--spacing-lg);
  right: var(--spacing-lg);
  width: 120px;
  opacity: 0.7;
}

.logo-svg {
  width: 100%;
  height: auto;
}

.logo-text {
  fill: var(--stevens-red);
  font-family: var(--font-family);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.1em;
}

/* ============================================
   KaTeX Overrides
   ============================================ */

.katex {
  font-size: 1.1em;
}

.katex-display {
  margin: 0;
}

/* ============================================
   Responsive Adjustments
   ============================================ */

@media (max-width: 768px) {
  #app {
    padding: var(--spacing-md);
  }

  #presenter-controls {
    width: calc(100% - var(--spacing-md) * 2);
    left: var(--spacing-md);
    bottom: var(--spacing-md);
  }

  .notification {
    width: calc(100% - var(--spacing-md) * 2);
    right: var(--spacing-md);
    top: var(--spacing-md);
  }

  #problem-view {
    padding: var(--spacing-md);
  }
}