/* ============================================================
   ANALISADOR DE ONDAS SONORAS — STYLE
   Design: Minimalista, científico, azul e branco
   PIBID Física UFRJ
   ============================================================ */

/* ---------- Google Fonts ---------- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@300;400;500;600&display=swap');

/* ---------- Custom Properties ---------- */
:root {
  /* Backgrounds — suavizado para conforto visual */
  --bg-primary: #edf2f7;
  --bg-secondary: #e2e8f0;
  --bg-card: #ffffff;
  --bg-card-hover: #f8fafc;
  --bg-input: #ffffff;
  --bg-surface: #e2e8f0;

  /* Borders */
  --border-subtle: #dbe2ea;
  --border-medium: #cbd5e1;
  --border-focus: #2563eb;

  /* Text */
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --text-accent: #2563eb;

  /* Accents — academic blue */
  --accent-primary: #2563eb;
  --accent-primary-dim: rgba(37, 99, 235, 0.08);
  --accent-light: #60a5fa;
  --accent-bright: #1d4ed8;
  --accent-warm: #d97706;
  --accent-warm-dim: rgba(217, 119, 6, 0.08);
  --accent-danger: #dc2626;
  --accent-danger-dim: rgba(220, 38, 38, 0.08);
  --accent-info: #2563eb;
  --accent-info-dim: rgba(37, 99, 235, 0.08);
  --accent-neutral: #64748b;

  /* Canvas */
  --canvas-bg: #f8fafc;
  --canvas-grid: rgba(0, 0, 0, 0.04);
  --canvas-wave: #2563eb;
  --canvas-fft-bar: #3b82f6;
  --canvas-fundamental: #1d4ed8;

  /* Note states */
  --note-tuned: #059669;
  --note-flat: #d97706;
  --note-sharp: #ea580c;

  /* Misc */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --shadow-card: 0 1px 4px rgba(15, 23, 42, 0.05), 0 1px 2px rgba(15, 23, 42, 0.03);
  --transition-fast: 0.12s ease;
  --transition-normal: 0.2s ease;

  /* ============================================================
     VARIÁVEIS DE FONTE DO PROJETO:
     - Altere --font-sans para mudar a fonte de títulos, botões e textos gerais.
     - Altere --font-mono para mudar a fonte de números, frequências e dados.
     ============================================================ */
  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'IBM Plex Mono', monospace;
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.5;
  overflow-x: hidden;
}

/* ---------- Layout ---------- */
.app-container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 24px 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-height: 100vh;
}

/* ---------- Header ---------- */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 0;
  border-bottom: 1px solid var(--border-subtle);
}

.app-header__title {
  display: flex;
  align-items: center;
  gap: 12px;
}

.app-header__logo {
  height: 85px;
  width: auto;
  object-fit: contain;
  display: block;
}

.app-header__controls {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  cursor: pointer;
  transition: all var(--transition-fast);
  user-select: none;
  white-space: nowrap;
}

.btn:hover {
  color: var(--text-primary);
  border-color: var(--border-focus);
  background: rgba(91, 156, 245, 0.04);
}

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

.btn--primary {
  color: var(--accent-primary);
  border-color: rgba(91, 156, 245, 0.25);
}

.btn--primary:hover {
  background: var(--accent-primary-dim);
  border-color: rgba(91, 156, 245, 0.4);
}

.btn--danger {
  color: var(--accent-danger);
  border-color: rgba(248, 113, 113, 0.2);
}

.btn--danger:hover {
  background: var(--accent-danger-dim);
  border-color: rgba(248, 113, 113, 0.35);
}

.btn--success {
  color: var(--accent-primary);
  border-color: rgba(91, 156, 245, 0.35);
  background: var(--accent-primary-dim);
}

.btn--small {
  padding: 4px 10px;
  font-size: 0.65rem;
}

/* Mic status */
.mic-status {
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 400;
  color: var(--text-muted);
  letter-spacing: 0.02em;
}

.mic-status__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--text-muted);
  transition: background var(--transition-normal);
}

.mic-status--active .mic-status__dot {
  background: var(--accent-primary);
  box-shadow: 0 0 8px rgba(91, 156, 245, 0.5);
}

.mic-status--active {
  color: var(--accent-primary);
}

.mic-status--requesting .mic-status__dot {
  background: var(--accent-warm);
  animation: pulse-dot 1s ease-in-out infinite;
}

.mic-status--requesting {
  color: var(--accent-warm);
}

.mic-status--denied .mic-status__dot {
  background: var(--accent-danger);
}

.mic-status--denied {
  color: var(--accent-danger);
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

/* ---------- Info Cards Row ---------- */
.info-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--border-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
}

/* ---------- Card Base ---------- */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.info-cards > .card {
  border: none;
  border-radius: 0;
}

.card__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px 8px;
}

.card__label {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.card__body {
  padding: 0 16px 16px;
}

/* ---------- Note Card ---------- */
.note-card {
  text-align: center;
}

.note-display {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}

.note-display__name {
  font-family: var(--font-sans);
  font-size: 2.6rem;
  font-weight: 300;
  color: var(--text-primary);
  line-height: 1.1;
  letter-spacing: -0.02em;
  transition: color var(--transition-normal);
}

.note-display__name--silent {
  color: var(--text-muted);
  font-size: 2rem;
}

.note-display__cents {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--text-secondary);
  margin-top: 4px;
  transition: color var(--transition-fast);
}

.note-display__cents--tuned { color: var(--note-tuned); }
.note-display__cents--flat { color: var(--accent-warm); }
.note-display__cents--sharp { color: var(--note-sharp); }

/* Cents bar */
.cents-bar {
  width: 100%;
  max-width: 160px;
  margin: 10px auto 0;
  position: relative;
  height: 2px;
  background: var(--border-medium);
  border-radius: 1px;
}

.cents-bar__center {
  position: absolute;
  left: 50%;
  top: -4px;
  width: 1px;
  height: 10px;
  background: var(--text-muted);
  transform: translateX(-50%);
}

.cents-bar__indicator {
  position: absolute;
  top: -4px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent-primary);
  transform: translateX(-50%);
  left: 50%;
  transition: left var(--transition-fast), background var(--transition-fast);
}

.cents-bar__indicator--tuned { background: var(--note-tuned); }
.cents-bar__indicator--flat { background: var(--accent-warm); }
.cents-bar__indicator--sharp { background: var(--note-sharp); }

.cents-bar__labels {
  display: flex;
  justify-content: space-between;
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 0.5rem;
  color: var(--text-muted);
  letter-spacing: 0.02em;
}

/* ---------- Frequency Card ---------- */
.freq-card {
  text-align: center;
}

.freq-display {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.freq-display__value {
  font-family: var(--font-mono);
  font-size: 1.8rem;
  font-weight: 300;
  color: var(--text-primary);
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.freq-display__unit {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 300;
  color: var(--text-muted);
}

.freq-display__ideal {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-muted);
}

/* ---------- Level Card ---------- */
.level-card .card__body {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.level-bar {
  width: 100%;
  height: 4px;
  background: var(--bg-input);
  border-radius: 2px;
  overflow: hidden;
}

.level-bar__fill {
  height: 100%;
  width: 0%;
  border-radius: 2px;
  transition: width 0.08s linear;
  background: linear-gradient(90deg,
    var(--accent-primary) 0%,
    var(--accent-light) 55%,
    var(--accent-warm) 80%,
    var(--accent-danger) 100%
  );
}

.level-value {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 300;
  color: var(--text-primary);
}

.level-label {
  font-family: var(--font-mono);
  font-size: 0.55rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* ---------- Alert Banner ---------- */
.alert-banner {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 400;
  animation: fadeIn 0.2s ease;
}

.alert-banner--visible {
  display: flex;
}

.alert-banner--warning {
  background: var(--accent-warm-dim);
  border: 1px solid rgba(251, 191, 36, 0.15);
  color: var(--accent-warm);
}

.alert-banner--error {
  background: var(--accent-danger-dim);
  border: 1px solid rgba(248, 113, 113, 0.15);
  color: var(--accent-danger);
}

.alert-banner--info {
  background: var(--accent-info-dim);
  border: 1px solid rgba(96, 165, 250, 0.15);
  color: var(--accent-info);
}

.alert-banner--success {
  background: var(--accent-primary-dim);
  border: 1px solid rgba(91, 156, 245, 0.15);
  color: var(--accent-primary);
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* ---------- Canvas Cards ---------- */
.canvas-card .card__body {
  padding: 4px;
}

.canvas-wrap {
  width: 100%;
  background: var(--canvas-bg);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.canvas-wrap canvas {
  display: block;
  width: 100%;
  height: 160px;
}

/* ---------- Controls Bar ---------- */
.controls-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 0;
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
  flex-wrap: wrap;
}

.controls-bar__group {
  display: flex;
  align-items: center;
  gap: 8px;
}

.controls-bar__separator {
  width: 1px;
  height: 20px;
  background: var(--border-subtle);
  margin: 0 6px;
}

/* Select */
.select-wrap {
  display: flex;
  align-items: center;
  gap: 6px;
}

.select-wrap label {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  font-weight: 400;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  white-space: nowrap;
}

.select-wrap select {
  padding: 5px 8px;
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-sm);
  background: var(--bg-input);
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  cursor: pointer;
  outline: none;
  transition: border-color var(--transition-fast);
}

.select-wrap select:focus {
  border-color: var(--border-focus);
  color: var(--text-primary);
}

/* Number input */
.number-input-wrap {
  display: flex;
  align-items: center;
  gap: 5px;
}

.number-input-wrap label {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  font-weight: 400;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  white-space: nowrap;
}

.number-input-wrap input[type="number"] {
  width: 60px;
  padding: 5px 6px;
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-sm);
  background: var(--bg-input);
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-align: center;
  outline: none;
  transition: border-color var(--transition-fast);
}

.number-input-wrap input[type="number"]:focus {
  border-color: var(--border-focus);
  color: var(--text-primary);
}

.number-input-wrap .unit {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  color: var(--text-muted);
}

/* ---------- History Card ---------- */
.history-card .card__body {
  padding: 10px 16px;
  min-height: 40px;
}

.history-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
}

.history-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 5px 10px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  animation: fadeIn 0.2s ease;
}

.history-item__note {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-primary);
}

.history-item__freq {
  font-family: var(--font-mono);
  font-size: 0.55rem;
  color: var(--text-muted);
}

.history-empty {
  font-family: var(--font-mono);
  color: var(--text-muted);
  font-size: 0.7rem;
}

/* ---------- Educational Panel ---------- */
.edu-panel {
  display: none;
}

.edu-panel--visible {
  display: block;
}

.edu-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 1px;
  background: var(--border-subtle);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.edu-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 10px 14px;
  background: var(--bg-card);
}

.edu-item__label {
  font-family: var(--font-mono);
  font-size: 0.55rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.edu-item__value {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 400;
  color: var(--text-primary);
}

/* ---------- Privacy & Credits Footer ---------- */
.app-footer {
  text-align: center;
  padding: 20px 0 8px;
  border-top: 1px solid var(--border-subtle);
  margin-top: 4px;
}

.app-footer__credit {
  font-family: var(--font-sans);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-primary);
  margin-bottom: 4px;
}

.app-footer__school {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-secondary);
  letter-spacing: 0.05em;
}

/* ---------- Calibration Overlay ---------- */
.calibration-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(15, 23, 42, 0.4);
  backdrop-filter: blur(4px);
  z-index: 100;
  justify-content: center;
  align-items: center;
}

.calibration-overlay--visible {
  display: flex;
}

.calibration-modal {
  background: var(--bg-card);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
  padding: 32px 40px;
  text-align: center;
  max-width: 340px;
}

.calibration-modal__icon {
  font-family: var(--font-sans);
  font-size: 0.7rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.calibration-modal__title {
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 8px;
  letter-spacing: 0.02em;
}

.calibration-modal__text {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-bottom: 20px;
  line-height: 1.6;
}

.calibration-modal__progress {
  width: 100%;
  height: 2px;
  background: var(--bg-input);
  border-radius: 1px;
  overflow: hidden;
}

.calibration-modal__progress-fill {
  height: 100%;
  width: 0%;
  background: var(--accent-primary);
  border-radius: 1px;
  transition: width 0.1s linear;
}

/* ---------- Frozen badge ---------- */
.frozen-badge {
  display: none;
  align-items: center;
  gap: 4px;
  padding: 3px 8px;
  border: 1px solid rgba(251, 191, 36, 0.2);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.6rem;
  font-weight: 500;
  color: var(--accent-warm);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  animation: pulse-frozen 2.5s ease-in-out infinite;
}

.frozen-badge--visible {
  display: inline-flex;
}

@keyframes pulse-frozen {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

/* ---------- Responsive ---------- */

@media (max-width: 900px) {
  .info-cards {
    grid-template-columns: 1fr 1fr;
  }
  .info-cards > .level-card {
    grid-column: 1 / -1;
  }
}

@media (max-width: 600px) {
  .app-container {
    padding: 16px 12px;
    gap: 8px;
  }

  .app-header {
    flex-direction: column;
    gap: 10px;
    text-align: center;
    padding: 12px 0;
  }

  .app-header__title h1 {
    font-size: 0.8rem;
  }

  .info-cards {
    grid-template-columns: 1fr;
  }

  .note-display__name {
    font-size: 2rem;
  }

  .freq-display__value {
    font-size: 1.4rem;
  }

  .canvas-wrap canvas {
    height: 120px;
  }

  .controls-bar {
    flex-direction: column;
    align-items: stretch;
  }

  .controls-bar__group {
    justify-content: center;
    flex-wrap: wrap;
  }

  .controls-bar__separator {
    display: none;
  }

  .edu-grid {
    grid-template-columns: 1fr;
  }
}

/* ---------- Scrollbar ---------- */
::-webkit-scrollbar {
  width: 4px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--border-medium);
  border-radius: 2px;
}

/* ---------- Utilities ---------- */
.hidden {
  display: none !important;
}