/* ==============================================================================
 * AetherSieve STFT Mobile Stylesheet
 * Version: v2.4.0 | Date: 2026-11-15 | UUID: 019a8f5c-8a20-7f28-9c44-3d4a22e8c1b7
 * ============================================================================== */

:root {
  --bg-primary: #07090e;
  --bg-surface: #11151e;
  --bg-card: #181d2a;
  --accent-cyan: #00e5ff;
  --accent-blue: #0077ff;
  --accent-red: #ff3366;
  --text-primary: #f0f4f8;
  --text-secondary: #8a99ad;
  --border-color: #263043;
  --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
}

body, html {
  width: 100%;
  height: 100%;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-stack);
  overflow-x: hidden;
  position: fixed;
}

.overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(7, 9, 14, 0.95);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  padding: 24px;
  backdrop-filter: blur(8px);
  transition: opacity 0.3s ease;
}

.overlay.hidden {
  opacity: 0;
  pointer-events: none;
}

.modal {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  padding: 28px;
  border-radius: 16px;
  max-width: 420px;
  text-align: center;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.8);
}

.modal h1 {
  font-size: 1.5rem;
  color: var(--accent-cyan);
  margin-bottom: 4px;
}

.modal .meta {
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
  font-family: monospace;
}

.modal .instructions {
  font-size: 0.875rem;
  line-height: 1.4;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

.status-banner {
  position: fixed;
  top: 12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent-red);
  color: #fff;
  padding: 8px 16px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  z-index: 1000;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
  transition: opacity 0.3s;
}

.status-banner.hidden {
  opacity: 0;
  pointer-events: none;
}

.app-container {
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: env(safe-area-inset-top, 12px) 12px env(safe-area-inset-bottom, 12px) 12px;
}

.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}

.brand h2 {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.brand .badge {
  font-size: 0.65rem;
  padding: 2px 6px;
  background: var(--border-color);
  border-radius: 6px;
  color: var(--accent-cyan);
}

.header-actions {
  display: flex;
  gap: 8px;
}

.icon-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  font-size: 1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
}

.icon-btn.active {
  background: var(--accent-cyan);
  color: var(--bg-primary);
  border-color: var(--accent-cyan);
}

.record-btn.active {
  background: var(--accent-red);
  color: white;
  animation: pulse-red 1.5s infinite;
}

@keyframes pulse-red {
  0% { transform: scale(1); }
  50% { transform: scale(1.08); }
  100% { transform: scale(1); }
}

.visualizer-container {
  position: relative;
  width: 100%;
  height: 160px;
  background: #000;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--border-color);
  margin-bottom: 8px;
}

#spectrogram-canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.readout-overlay {
  position: absolute;
  bottom: 4px;
  left: 8px;
  right: 8px;
  display: flex;
  justify-content: space-between;
  font-size: 0.65rem;
  color: rgba(255, 255, 255, 0.6);
  font-family: monospace;
  pointer-events: none;
}

.controls-grid {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding-bottom: 12px;
}

.card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 10px 14px;
}

.group-title {
  display: block;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--accent-cyan);
  margin-bottom: 8px;
  font-weight: 700;
}

.toggle-group {
  display: flex;
  gap: 6px;
}

.toggle-btn {
  flex: 1;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 7px 0;
  border-radius: 8px;
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
}

.toggle-btn.active {
  background: var(--accent-blue);
  color: #fff;
  border-color: var(--accent-cyan);
}

.slider-row {
  margin-bottom: 8px;
}

.slider-row:last-child {
  margin-bottom: 0;
}

.slider-label {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  margin-bottom: 2px;
  color: var(--text-secondary);
}

.slider-label span:last-child {
  font-family: monospace;
  color: var(--text-primary);
}

input[type="range"] {
  width: 100%;
  height: 28px;
  background: transparent;
  -webkit-appearance: none;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-runnable-track {
  height: 6px;
  background: var(--bg-card);
  border-radius: 3px;
  border: 1px solid var(--border-color);
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  height: 20px;
  width: 20px;
  border-radius: 50%;
  background: var(--accent-cyan);
  margin-top: -8px;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.4);
}

.select-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.75rem;
  margin-top: 6px;
  color: var(--text-secondary);
}

.native-select {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 4px 8px;
  border-radius: 6px;
  font-size: 0.75rem;
  outline: none;
}

.primary-btn {
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
  color: #07090e;
  border: none;
  padding: 12px 28px;
  border-radius: 24px;
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
}

.secondary-btn {
  flex: 1;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 9px 0;
  border-radius: 8px;
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
}

.secondary-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.button-row {
  display: flex;
  gap: 8px;
}