/* ============================================================
   Guitar Tuner — page-specific styles
   Uses design tokens from /css/styles.css
   ============================================================ */

/* ── Dark theme tokens ── */
.tuner-page {
  --bg: #0C1A14;
  --bg-card: #12251B;
  --bg-card-border: #1F4B34;
  --text: #E8F5EE;
  --text-dim: #7CA88E;
  --gauge-track: #1A3D2C;
  --gauge-green: #10B981;
  --gauge-yellow: #F59E0B;
  --gauge-red: #EF4444;
  --needle: #E8F5EE;
  --btn-bg: #10B981;
  --btn-bg-hover: #059669;
  --btn-stop: #EF4444;
  --btn-stop-hover: #DC2626;
}

/* ── Layout ── */
.tuner-page {
  max-width: 680px;
  margin: 0 auto;
  padding: 48px 24px 80px;
  background: var(--bg);
  min-height: 100vh;
}

/* Override body background when tuner page is loaded */
body:has(.tuner-page) {
  background: #0C1A14;
}
body:has(.tuner-page) .nav {
  background: rgba(12, 26, 20, 0.92);
  border-bottom-color: #1F4B34;
}
body:has(.tuner-page) .nav__menu a { color: #7CA88E; }
body:has(.tuner-page) .nav__menu a:hover,
body:has(.tuner-page) .nav__menu a.active { color: #10B981; }
body:has(.tuner-page) .footer { background: #0A1610; color: #7CA88E; }
body:has(.tuner-page) .footer h4 { color: #E8F5EE; }
body:has(.tuner-page) .footer a { color: #7CA88E; }
body:has(.tuner-page) .footer a:hover { color: #10B981; }
body:has(.tuner-page) .footer__bottom { border-top-color: #1F4B34; color: #5A8A6E; }
body:has(.tuner-page) .footer__brand p,
body:has(.tuner-page) .footer .loc { color: #5A8A6E; }

.tuner-page h1 {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  color: var(--text);
  margin-bottom: 8px;
  text-align: center;
}

.tuner-page .page-subtitle {
  color: var(--text-dim);
  font-size: 1rem;
  margin-bottom: 36px;
  text-align: center;
}
.tuner-page .page-subtitle strong { color: var(--text); font-weight: 500; }

/* ── Tuner Card ── */
.tuner {
  background: var(--bg-card);
  border: 1px solid var(--bg-card-border);
  border-radius: var(--radius-lg);
  padding: 36px 28px 28px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  transition: border-color 0.3s, box-shadow 0.3s;
}
.tuner--flash {
  border-color: var(--gauge-green);
  box-shadow: 0 0 30px rgba(16, 185, 129, 0.25), inset 0 0 20px rgba(16, 185, 129, 0.05);
}

/* ── Status ── */
.tuner__status {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--text-dim);
  text-align: center;
  min-height: 20px;
}
.tuner__status.active {
  color: var(--gauge-green);
}
.tuner__status.error {
  color: var(--gauge-red);
  background: rgba(239, 68, 68, 0.12);
  border: 1px solid rgba(239, 68, 68, 0.25);
  border-radius: var(--radius-sm);
  padding: 10px 16px;
  font-size: 0.875rem;
  line-height: 1.5;
}

/* ── Gauge ── */
.tuner__gauge {
  width: 100%;
  max-width: 340px;
  margin: 0 auto;
}
.gauge { position: relative; }
.gauge__svg { width: 100%; height: auto; display: block; }
.gauge__needle {
  transform-origin: 150px 150px;
  transition: transform 0.15s ease-out;
}
.gauge__labels {
  display: flex;
  justify-content: space-between;
  padding: 0 8px;
  margin-top: -8px;
}
.gauge__label {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ── Note Display ── */
.tuner__note {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-top: 4px;
}
.note-name {
  font-family: var(--font-display);
  font-size: 4rem;
  font-weight: 500;
  color: var(--text);
  line-height: 1;
  transition: color 0.2s;
}
.note-name.in-tune { color: var(--gauge-green); }
.note-name.close { color: var(--gauge-yellow); }
.note-name.far { color: var(--gauge-red); }

.note-octave {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  color: var(--text-dim);
}

.tuner__target {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--gauge-green);
  opacity: 0.7;
  text-align: center;
  min-height: 20px;
  margin-bottom: 4px;
}

.tuner__detail {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--text-dim);
  margin-bottom: 8px;
}
.tuner__sep { opacity: 0.3; }

/* ── String Indicators ── */
.tuner__strings {
  display: flex;
  gap: 8px;
  margin: 12px 0 4px;
}
.string-btn {
  width: 44px;
  height: 44px;
  border-radius: var(--radius);
  border: 1px solid var(--bg-card-border);
  background: transparent;
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
}
.string-btn:hover {
  border-color: var(--gauge-green);
  color: var(--text);
}
.string-btn.selected {
  background: rgba(16, 185, 129, 0.15);
  border-color: var(--gauge-green);
  color: var(--gauge-green);
  box-shadow: 0 0 12px rgba(16, 185, 129, 0.2);
  animation: string-pulse 1.5s ease-in-out infinite;
}
.string-btn.tuned {
  background: var(--gauge-green);
  border-color: var(--gauge-green);
  color: #fff;
  pointer-events: auto;
}
.string-btn.tuned::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 50%;
  transform: translateX(-50%);
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--gauge-green);
}
.string-btn {
  position: relative;
}
@keyframes string-pulse {
  0%, 100% { box-shadow: 0 0 8px rgba(16, 185, 129, 0.15); }
  50% { box-shadow: 0 0 18px rgba(16, 185, 129, 0.35); }
}

/* ── Controls ── */
.tuner__controls {
  margin: 16px 0 12px;
}
.tuner-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 32px;
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  border: none;
}
.tuner-btn--start {
  background: var(--btn-bg);
  color: #fff;
  box-shadow: 0 2px 12px rgba(16, 185, 129, 0.3);
}
.tuner-btn--start:hover {
  background: var(--btn-bg-hover);
  transform: translateY(-1px);
}
.tuner-btn--stop {
  background: var(--btn-stop);
  color: #fff;
  box-shadow: 0 2px 12px rgba(239, 68, 68, 0.3);
}
.tuner-btn--stop:hover {
  background: var(--btn-stop-hover);
  transform: translateY(-1px);
}

/* ── Settings ── */
.tuner__settings {
  display: flex;
  gap: 20px;
  align-items: center;
  margin-top: 8px;
  padding-top: 16px;
  border-top: 1px solid var(--bg-card-border);
  width: 100%;
  justify-content: center;
  flex-wrap: wrap;
}
.tuner-setting {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-dim);
}
.tuner-setting select,
.tuner-setting input[type="number"] {
  padding: 6px 10px;
  border: 1px solid var(--bg-card-border);
  border-radius: var(--radius-sm);
  background: var(--bg);
  color: var(--text);
  font-size: 0.8125rem;
  font-family: var(--font-mono);
  outline: none;
  transition: border-color 0.2s;
}
.tuner-setting select:focus,
.tuner-setting input:focus {
  border-color: var(--gauge-green);
}
.tuner-setting select {
  min-width: 160px;
}
.tuner-setting input[type="number"] {
  width: 64px;
  text-align: center;
}
.tuner-setting__unit {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-dim);
  opacity: 0.6;
}

/* ── Content Sections ── */
.tuner-info {
  margin-top: 32px;
  padding: 28px;
  background: var(--bg-card);
  border: 1px solid var(--bg-card-border);
  border-radius: var(--radius-lg);
}
.tuner-info + .tuner-info { margin-top: 20px; }
.tuner-info h2 {
  font-family: var(--font-display);
  font-size: 1.375rem;
  color: var(--text);
  margin-bottom: 16px;
}
.tuner-info h3 {
  font-size: 1rem;
  font-family: var(--font-body);
  font-weight: 600;
  color: var(--text);
  margin: 20px 0 8px;
}
.tuner-info h3:first-of-type { margin-top: 12px; }
.tuner-info ol, .tuner-info ul {
  margin: 0;
  padding-left: 20px;
  color: var(--text-dim);
  line-height: 1.8;
}
.tuner-info ol strong { color: var(--text); font-weight: 500; }
.tuner-info p {
  margin: 12px 0 0;
  font-size: 0.9rem;
  color: var(--text-dim);
  line-height: 1.7;
}
.tuner-info a {
  color: var(--gauge-green);
  text-decoration: underline;
  text-underline-offset: 2px;
}
.tuner-info a:hover { opacity: 0.8; }
.tuner-info--links {
  background: transparent;
  border: none;
  padding: 0 4px;
  text-align: center;
}
.tuner-info--links p { opacity: 0.6; font-size: 0.85rem; }

/* Frequency Table */
.tuner-table {
  width: 100%;
  border-collapse: collapse;
  margin: 12px 0;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
}
.tuner-table th {
  text-align: left;
  padding: 8px 12px;
  color: var(--text-dim);
  font-weight: 500;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--bg-card-border);
}
.tuner-table td {
  padding: 8px 12px;
  color: var(--text);
  border-bottom: 1px solid rgba(31, 75, 52, 0.3);
}
.tuner-table tbody tr:last-child td { border-bottom: none; }
.tuner-table td:last-child {
  color: var(--gauge-green);
  font-weight: 500;
}

/* FAQ */
.tuner-faq { margin-bottom: 16px; }
.tuner-faq:last-child { margin-bottom: 0; }
.tuner-faq h3 {
  font-size: 0.9375rem;
  margin: 0 0 6px;
}
.tuner-faq p {
  margin: 0;
  font-size: 0.875rem;
}

/* ── Celebration Overlay ── */
.tuner--done {
  position: relative;
}
.celebration {
  position: absolute;
  inset: 0;
  background: rgba(12, 26, 20, 0.92);
  backdrop-filter: blur(8px);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
  animation: celebration-in 0.4s ease-out;
}
.celebration__content {
  text-align: center;
  padding: 32px;
}
.celebration__icon {
  font-size: 4rem;
  line-height: 1;
  margin-bottom: 16px;
  animation: celebration-bounce 0.6s ease-out;
}
.celebration__title {
  font-family: var(--font-display);
  font-size: 2rem;
  color: var(--gauge-green);
  margin-bottom: 8px;
}
.celebration__text {
  color: var(--text-dim);
  font-size: 1rem;
  margin-bottom: 24px;
}
.celebration__btn {
  padding: 12px 28px;
}
@keyframes celebration-in {
  from { opacity: 0; transform: scale(0.95); }
  to { opacity: 1; transform: scale(1); }
}
@keyframes celebration-bounce {
  0% { transform: scale(0.3) rotate(-10deg); opacity: 0; }
  50% { transform: scale(1.15) rotate(5deg); }
  100% { transform: scale(1) rotate(0deg); opacity: 1; }
}

/* ── Responsive ── */
@media (max-width: 480px) {
  .tuner-page { padding: 32px 16px 64px; }
  .tuner { padding: 28px 16px 20px; }
  .note-name { font-size: 3rem; }
  .tuner__strings { gap: 6px; }
  .string-btn { width: 40px; height: 40px; font-size: 0.75rem; }
  .tuner__settings { flex-direction: column; gap: 12px; }
}