/* =====================
   CSS Custom Properties
   ===================== */
:root {
  --bg: #0f0f0f;
  --card: #1e1e1e;
  --accent: #6c63ff;
  --accent-hover: #574fd6;
  --text-primary: #e0e0e0;
  --text-interim: #888;
  --text-muted: #aaa;
  --error: #ff5555;
  --border: #2e2e2e;
  --radius: 12px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
  --translate-accent: #10b981;
  --translate-accent-dim: rgba(16, 185, 129, 0.15);
}

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

html, body {
  height: 100%;
}

body {
  background-color: var(--bg);
  color: var(--text-primary);
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  min-height: 100vh;
  padding: 2rem 1rem;
}

/* =====================
   App Shell
   ===================== */
.app {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 2rem;
  width: 100%;
  max-width: 640px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
  transition: max-width 0.35s ease;
}

.app.translate-on {
  max-width: 1100px;
}

header h1 {
  font-size: 1.6rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  text-align: center;
}

/* =====================
   Controls (Language Select)
   ===================== */
.controls {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  width: 100%;
}

.control-group {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  width: 100%;
}

.controls label {
  font-size: 0.875rem;
  color: var(--text-muted);
  white-space: nowrap;
}

#engine-select, #lang-select {
  flex: 1;
  background: var(--bg);
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.5rem 0.75rem;
  font-size: 0.9rem;
  cursor: pointer;
  outline: none;
  transition: border-color 0.2s;
}

#engine-select:focus, #lang-select:focus {
  border-color: var(--accent);
}

/* =====================
   Toggle Switch
   ===================== */
.translate-toggle-group {
  justify-content: flex-start;
}

.toggle-switch {
  position: relative;
  display: inline-block;
  width: 44px;
  height: 24px;
  cursor: pointer;
  flex-shrink: 0;
}

.toggle-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-slider {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--border);
  border-radius: 24px;
  transition: background-color 0.25s ease;
}

.toggle-slider::before {
  content: '';
  position: absolute;
  width: 18px;
  height: 18px;
  left: 3px;
  bottom: 3px;
  background-color: #fff;
  border-radius: 50%;
  transition: transform 0.25s ease;
}

.toggle-switch input:checked + .toggle-slider {
  background-color: var(--translate-accent);
}

.toggle-switch input:checked + .toggle-slider::before {
  transform: translateX(20px);
}

.toggle-switch input:focus-visible + .toggle-slider {
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.4);
}

/* =====================
   Status Area
   ===================== */
.status-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  width: 100%;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.status-container.hidden {
  display: none;
}

.recording-indicator {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: #e05252;
  animation: pulse-dot-anim 1.5s infinite;
}

@keyframes pulse-dot-anim {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(224, 82, 82, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 6px rgba(224, 82, 82, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(224, 82, 82, 0); }
}

.chunk-info {
  opacity: 0.7;
}

.detected-lang {
  background: rgba(108, 99, 255, 0.1);
  color: var(--accent);
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 500;
}

.detected-lang.hidden {
  display: none;
}

/* =====================
   Mic Button
   ===================== */
.mic-btn {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  background-color: var(--accent);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  transition: background-color 0.2s, transform 0.1s;
  outline: none;
  position: relative;
}

.mic-btn:hover {
  background-color: var(--accent-hover);
}

.mic-btn:active {
  transform: scale(0.95);
}

.mic-btn:focus-visible {
  box-shadow: 0 0 0 3px rgba(108, 99, 255, 0.5);
}

/* Pulsing animation when recording */
@keyframes pulse {
  0%   { transform: scale(1);    box-shadow: 0 0 0 0   rgba(224, 82, 82, 0.7); }
  50%  { transform: scale(1.07); box-shadow: 0 0 0 20px rgba(224, 82, 82, 0);  }
  100% { transform: scale(1);    box-shadow: 0 0 0 0   rgba(224, 82, 82, 0);   }
}

.mic-btn.recording {
  background-color: #e05252;
  animation: pulse 1.4s ease-in-out infinite;
}

.mic-btn.loading {
  pointer-events: none;
  opacity: 0.8;
  background-color: var(--accent);
}

.mic-btn.loading svg {
  display: none;
}

.mic-btn.loading::after {
  content: '';
  width: 32px;
  height: 32px;
  border: 3px solid rgba(255, 255, 255, 0.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

.pulse-dot.hidden {
  display: none;
}

/* =====================
   Panels Wrapper
   ===================== */
.panels-wrapper {
  display: flex;
  width: 100%;
  gap: 1rem;
  transition: gap 0.3s ease;
}

.panel-column {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-width: 0;
}

.panel-column.hidden {
  display: none;
}

.panel-transcript {
  flex: 1;
}

.panel-translation {
  flex: 1;
  animation: fade-slide-in 0.35s ease-out;
}

@keyframes fade-slide-in {
  from {
    opacity: 0;
    transform: translateX(20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* =====================
   Transcript Area
   ===================== */
.transcript {
  width: 100%;
  min-height: 200px;
  max-height: 380px;
  overflow-y: auto;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
  font-size: 1rem;
  line-height: 1.7;
  word-break: break-word;
  scroll-behavior: smooth;
}

/* Interim (in-progress) text — gray and italic */
.transcript .interim {
  color: var(--text-interim);
  font-style: italic;
}

/* Final (committed) text */
.transcript .final {
  color: var(--text-primary);
}

.speaker-line {
  margin-bottom: 0.5rem;
}

.speaker-name {
  font-weight: 600;
  margin-right: 0.25rem;
}

.speaker-A .speaker-name {
  color: #3b82f6; /* Blue */
}

.speaker-B .speaker-name {
  color: #f97316; /* Orange */
}

/* =====================
   Translation Box
   ===================== */
.translation-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.translation-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
}

.translation-lang-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.15rem 0.5rem;
  border-radius: 6px;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  background: var(--translate-accent-dim);
  color: var(--translate-accent);
}

.translation-spinner {
  display: inline-block;
  width: 14px;
  height: 14px;
  border: 2px solid rgba(16, 185, 129, 0.2);
  border-top-color: var(--translate-accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.translation-spinner.hidden {
  display: none;
}

.translation-box {
  border-color: rgba(16, 185, 129, 0.25);
}

.translation-actions {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.4rem;
}

.translation-action-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.35rem 0.65rem;
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.75rem;
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s, background-color 0.2s;
}

.translation-action-btn:hover {
  color: var(--translate-accent);
  border-color: var(--translate-accent);
  background: var(--translate-accent-dim);
}

.libretranslate-credit {
  display: block;
  margin-top: 0.5rem;
  font-size: 0.65rem;
  color: var(--text-muted);
  opacity: 0.6;
  text-decoration: none;
  transition: opacity 0.2s;
}

.libretranslate-credit:hover {
  opacity: 1;
  color: var(--translate-accent);
}

/* =====================
   Action Buttons
   ===================== */
.action-buttons {
  display: flex;
  gap: 0.75rem;
  width: 100%;
}

.action-buttons button {
  flex: 1;
  padding: 0.6rem 1rem;
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.875rem;
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s, background-color 0.2s;
}

.action-buttons button:hover {
  color: var(--text-primary);
  border-color: var(--accent);
  background-color: rgba(108, 99, 255, 0.08);
}

.action-buttons button:active {
  background-color: rgba(108, 99, 255, 0.15);
}

/* =====================
   Error Message
   ===================== */
.error {
  width: 100%;
  background: rgba(255, 85, 85, 0.1);
  border: 1px solid var(--error);
  color: var(--error);
  border-radius: 8px;
  padding: 0.75rem 1rem;
  font-size: 0.875rem;
  text-align: center;
}

.error.hidden {
  display: none;
}

/* =====================
   Toasts
   ===================== */
.toast-container {
  position: fixed;
  bottom: 20px;
  right: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 1000;
}

.toast {
  background: var(--card);
  border: 1px solid var(--border);
  border-left: 4px solid var(--error);
  color: var(--text-primary);
  padding: 1rem;
  border-radius: 6px;
  box-shadow: var(--shadow);
  font-size: 0.875rem;
  transition: opacity 0.3s ease;
  animation: slide-in 0.3s ease-out;
}

.toast.toast-error {
  border-left-color: var(--error);
  color: var(--error);
}

.toast.fade-out {
  opacity: 0;
}

@keyframes slide-in {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

/* =====================
   Mobile Responsive
   ===================== */
@media (max-width: 600px) {
  body {
    padding: 1rem 0.5rem;
  }

  .app {
    padding: 1.25rem;
    gap: 1.25rem;
    border-radius: 8px;
  }

  .app.translate-on {
    max-width: 100%;
  }

  header h1 {
    font-size: 1.3rem;
  }

  .mic-btn {
    width: 84px;
    height: 84px;
  }

  .transcript {
    min-height: 160px;
    font-size: 0.95rem;
  }

  /* Stack panels vertically on mobile */
  .panels-wrapper {
    flex-direction: column;
  }

  .panel-translation {
    animation-name: fade-slide-down;
  }

  @keyframes fade-slide-down {
    from {
      opacity: 0;
      transform: translateY(10px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }
}