/* ============================================================================
   guitar-kit.css — dark theme, teal accent
   ========================================================================== */

:root {
  --gk-bg:          #0c0e10;
  --gk-bg-2:        #14171a;
  --gk-panel:       #191d21;
  --gk-panel-2:     #1f242a;
  --gk-line:        #2a3037;
  --gk-line-soft:   #22272c;

  --gk-text:        #e8edf1;
  --gk-text-2:      #9aa5af;
  --gk-text-3:      #667079;

  --gk-teal:        #2dd4bf;
  --gk-teal-dim:    #14b8a6;
  --gk-teal-glow:   rgba(45, 212, 191, 0.35);
  --gk-amber:       #f4a742;
  --gk-red:         #ef4a4a;

  --gk-radius:      10px;
  --gk-radius-sm:   6px;

  --font-body: 'Outfit', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background:
    radial-gradient(900px 500px at 15% -10%, rgba(45,212,191,0.07), transparent 60%),
    var(--gk-bg);
  color: var(--gk-text);
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
}

.gk-app {
  max-width: 1240px;
  margin: 0 auto;
  padding: 22px 18px 60px;
}

.gk-noscript {
  max-width: 1240px;
  margin: 18px auto;
  padding: 16px 20px;
  background: var(--gk-panel);
  border: 1px solid var(--gk-amber);
  border-radius: var(--gk-radius);
  color: var(--gk-text);
  font-family: var(--font-body);
}

h1, h2, h3 { margin: 0; font-weight: 700; letter-spacing: -0.01em; }

kbd {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  background: var(--gk-panel-2);
  border: 1px solid var(--gk-line);
  border-bottom-width: 2px;
  border-radius: 4px;
  padding: 2px 6px;
  color: var(--gk-text-2);
  white-space: nowrap;
}

/* ------------------------------------------------------------------ header */

.gk-header {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 22px;
  padding: 18px 20px;
  background: linear-gradient(180deg, var(--gk-panel), var(--gk-bg-2));
  border: 1px solid var(--gk-line);
  border-radius: var(--gk-radius);
}

.gk-brand { display: flex; align-items: center; gap: 16px; margin-right: auto; }

/* Site logo (matches the main site header) — links home. Height is the single
   sizing knob; the SVG keeps its own 6:1 aspect ratio. */
.gk-logo-link { display: block; line-height: 0; border-radius: 6px; }
.gk-logo-link:focus-visible { outline: 2px solid var(--gk-teal); outline-offset: 4px; }
.gk-logo {
  height: 46px;
  width: auto;
  display: block;
  transition: opacity .15s;
}
.gk-logo-link:hover .gk-logo { opacity: 0.85; }

.gk-brand-divider { width: 1px; height: 38px; background: var(--gk-line); }

.gk-tool-name { display: flex; flex-direction: column; line-height: 1.2; }
.gk-tool-name strong { font-size: 1rem; font-weight: 700; color: var(--gk-text); }
.gk-tool-name span {
  font-family: var(--font-mono);
  font-size: 0.64rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--gk-text-3);
}

/* Screen-reader-only heading — keeps a real <h1> for SEO while the logo shows. */
.gk-visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.gk-transport {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 16px;
}

/* ------------------------------------------------------------------ fields */

.gk-field { display: flex; flex-direction: column; gap: 6px; min-width: 118px; }

.gk-field label,
.gk-knob-label,
.gk-fx-controls label {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--gk-text-3);
  display: flex;
  justify-content: space-between;
  gap: 8px;
}

.gk-field output, .gk-knob-label output { color: var(--gk-teal); }

/* ------------------------------------------------------------------ ranges */

.gk-range {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 20px;
  background: transparent;
  cursor: pointer;
}
.gk-range::-webkit-slider-runnable-track {
  height: 4px;
  border-radius: 3px;
  background: var(--gk-line);
}
.gk-range::-moz-range-track {
  height: 4px; border-radius: 3px; background: var(--gk-line);
}
.gk-range::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px; height: 14px;
  margin-top: -5px;
  border-radius: 50%;
  background: var(--gk-teal);
  border: 2px solid var(--gk-bg-2);
  box-shadow: 0 0 8px var(--gk-teal-glow);
  transition: transform .12s;
}
.gk-range::-moz-range-thumb {
  width: 14px; height: 14px; border-radius: 50%;
  background: var(--gk-teal); border: 2px solid var(--gk-bg-2);
}
.gk-range:hover::-webkit-slider-thumb { transform: scale(1.15); }
.gk-range-sm { height: 16px; }
.gk-range:focus-visible { outline: 2px solid var(--gk-teal); outline-offset: 3px; }

/* ----------------------------------------------------------------- buttons */

.gk-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 16px;
  background: var(--gk-panel-2);
  border: 1px solid var(--gk-line);
  border-radius: var(--gk-radius-sm);
  color: var(--gk-text);
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: background .15s, border-color .15s, color .15s;
}
.gk-btn:hover { background: #262c33; border-color: #37404a; }
.gk-btn:focus-visible { outline: 2px solid var(--gk-teal); outline-offset: 2px; }
.gk-btn-sm { padding: 6px 11px; font-size: 0.78rem; }
.gk-btn-danger:hover { border-color: var(--gk-red); color: #ff8b8b; }

.gk-btn-play { min-width: 108px; justify-content: center; }
.gk-btn-play.active {
  background: var(--gk-teal);
  border-color: var(--gk-teal);
  color: #062b26;
  box-shadow: 0 0 20px var(--gk-teal-glow);
}
.gk-play-icon {
  width: 0; height: 0;
  border-left: 10px solid currentColor;
  border-top: 6px solid transparent;
  border-bottom: 6px solid transparent;
}
.gk-btn-play.active .gk-play-icon {
  width: 10px; height: 11px;
  border: none;
  background: currentColor;
  border-radius: 2px;
}

.gk-rec-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: #4d5760;
  transition: background .15s, box-shadow .15s;
}
.gk-btn-rec.active { border-color: var(--gk-red); color: #ff9b9b; }
.gk-btn-rec.active .gk-rec-dot {
  background: var(--gk-red);
  box-shadow: 0 0 10px rgba(239,74,74,.8);
  animation: gk-blink 1.1s infinite;
}
@keyframes gk-blink { 50% { opacity: .35; } }

/* ----------------------------------------------------------------- stepper */

.gk-stepper { position: relative; display: flex; }

.gk-stepper input {
  width: 100%;
  padding: 8px 30px 8px 12px;
  background: var(--gk-bg);
  border: 1px solid var(--gk-line);
  border-radius: var(--gk-radius-sm);
  color: var(--gk-text);
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 700;
  -moz-appearance: textfield;
}
.gk-stepper input::-webkit-outer-spin-button,
.gk-stepper input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
.gk-stepper input:focus { outline: none; border-color: var(--gk-teal); }

.gk-stepper-arrows {
  position: absolute;
  right: 3px; top: 3px; bottom: 3px;
  display: flex; flex-direction: column;
}
.gk-arrow {
  flex: 1;
  width: 24px;
  padding: 0;
  background: var(--gk-panel-2);
  border: 1px solid var(--gk-line);
  color: var(--gk-text-2);
  font-size: 0.5rem;
  line-height: 1;
  cursor: pointer;
}
.gk-arrow:first-child { border-radius: 4px 4px 0 0; }
.gk-arrow:last-child  { border-radius: 0 0 4px 4px; border-top: none; }
.gk-arrow:hover { background: var(--gk-teal); color: #062b26; }

/* ------------------------------------------------------------------ select */

.gk-select {
  padding: 8px 11px;
  background: var(--gk-bg);
  border: 1px solid var(--gk-line);
  border-radius: var(--gk-radius-sm);
  color: var(--gk-text);
  font-family: var(--font-body);
  font-size: 0.85rem;
  cursor: pointer;
}
.gk-select:focus { outline: none; border-color: var(--gk-teal); }
.gk-select-sm { padding: 5px 8px; font-size: 0.78rem; }

/* ------------------------------------------------------------- pattern bar */

.gk-patternbar {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
  justify-content: space-between;
  margin-top: 16px;
  padding: 12px 16px;
  background: var(--gk-panel);
  border: 1px solid var(--gk-line);
  border-radius: var(--gk-radius);
}

.gk-pattern-tabs { display: flex; gap: 6px; flex-wrap: wrap; }

.gk-tab {
  position: relative;
  padding: 8px 16px;
  background: transparent;
  border: 1px solid var(--gk-line);
  border-radius: var(--gk-radius-sm);
  color: var(--gk-text-2);
  font-family: var(--font-body);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: all .15s;
}
.gk-tab:hover { color: var(--gk-text); border-color: #37404a; }
.gk-tab.active {
  background: rgba(45,212,191,0.12);
  border-color: var(--gk-teal);
  color: var(--gk-teal);
}
.gk-tab.has-notes::after {
  content: '';
  position: absolute;
  top: 6px; right: 6px;
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--gk-teal-dim);
}

.gk-pattern-actions { display: flex; gap: 6px; flex-wrap: wrap; align-items: center; }
.gk-sep { width: 1px; height: 22px; background: var(--gk-line); margin: 0 4px; }

/* -------------------------------------------------------------------- grid */

.gk-grid-wrap {
  margin-top: 16px;
  padding: 16px;
  background: var(--gk-panel);
  border: 1px solid var(--gk-line);
  border-radius: var(--gk-radius);
  overflow-x: auto;
}

.gk-grid { min-width: 860px; display: flex; flex-direction: column; gap: 6px; }

.gk-row { display: grid; grid-template-columns: 250px 1fr; gap: 14px; align-items: center; }

.gk-row-head { display: flex; flex-direction: column; gap: 7px; }

.gk-row-top { display: flex; align-items: center; gap: 6px; }
.gk-row-top .gk-row-sound { flex: 1; min-width: 0; }

.gk-key {
  width: 28px; height: 28px;
  flex: none;
  background: var(--gk-panel-2);
  border: 1px solid var(--gk-line);
  border-radius: var(--gk-radius-sm);
  color: var(--gk-text-2);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  cursor: pointer;
  transition: all .1s;
}
.gk-key:hover { border-color: var(--gk-teal); color: var(--gk-teal); }
.gk-key.hit {
  background: var(--gk-teal); color: #062b26; border-color: var(--gk-teal);
  transform: scale(0.92);
}

.gk-mini {
  width: 24px; height: 24px;
  flex: none;
  padding: 0;
  background: transparent;
  border: 1px solid var(--gk-line);
  border-radius: 5px;
  color: var(--gk-text-3);
  font-family: var(--font-mono);
  font-size: 0.66rem;
  font-weight: 700;
  cursor: pointer;
}
.gk-mini:hover { color: var(--gk-text); }
.gk-mini.on { background: var(--gk-amber); border-color: var(--gk-amber); color: #2a1a04; }

.gk-row-knobs { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.gk-knob { display: flex; flex-direction: column; gap: 1px; }

/* ------------------------------------------------------------------- steps */

/* Steps are nested one level — 4 beat groups of 4 sixteenths — so the wider
   gap between beats comes from the grid gap rather than a margin on the item.
   A margin would eat into the track and leave every 4th step visibly narrower. */
.gk-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}
.gk-beat {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 4px;
}

.gk-step {
  position: relative;
  height: 34px;
  padding: 0;
  background: var(--gk-panel-2);
  border: 1px solid var(--gk-line-soft);
  border-radius: var(--gk-radius-sm);
  cursor: pointer;
  transition: background .1s, border-color .1s, transform .07s;
}
.gk-step:hover { background: #2b323a; border-color: #3a434d; }
.gk-step.gk-step-beat { border-color: #333b44; }   /* downbeat reads slightly brighter */

.gk-step.on {
  background: linear-gradient(180deg, var(--gk-teal), var(--gk-teal-dim));
  border-color: var(--gk-teal);
  box-shadow: 0 0 12px var(--gk-teal-glow);
}
.gk-step.accent {
  background: linear-gradient(180deg, #7dffef, var(--gk-teal));
  border-color: #7dffef;
  box-shadow: 0 0 16px var(--gk-teal-glow);
}
.gk-step.accent::after {
  content: '';
  position: absolute;
  inset: auto 0 4px 0;
  margin: auto;
  width: 12px; height: 2px;
  background: rgba(6,43,38,.65);
  border-radius: 2px;
}

.gk-step.playing { border-color: #fff; }
.gk-step.playing:not(.on):not(.accent) { background: #333c45; }
.gk-step.cursor { outline: 2px solid var(--gk-amber); outline-offset: 1px; }
.gk-step:active { transform: scale(0.94); }

.gk-tick {
  height: 18px;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 0.6rem;
  color: var(--gk-text-3);
  border-radius: 4px;
}
.gk-tick-beat { color: var(--gk-text-2); font-weight: 700; }
.gk-tick.playing { background: rgba(45,212,191,.18); color: var(--gk-teal); }

.gk-hint {
  margin: 14px 0 0;
  font-size: 0.78rem;
  color: var(--gk-text-3);
}

/* ------------------------------------------------------------------ panels */

.gk-panels { margin-top: 16px; display: flex; flex-direction: column; gap: 12px; }

.gk-panel {
  background: var(--gk-panel);
  border: 1px solid var(--gk-line);
  border-radius: var(--gk-radius);
  overflow: hidden;
}

.gk-panel > summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  cursor: pointer;
  list-style: none;
  user-select: none;
}
.gk-panel > summary::-webkit-details-marker { display: none; }
.gk-panel > summary:hover { background: var(--gk-panel-2); }

.gk-panel-title {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gk-teal);
}

.gk-chev {
  width: 8px; height: 8px;
  border-right: 2px solid var(--gk-text-3);
  border-bottom: 2px solid var(--gk-text-3);
  transform: rotate(45deg);
  transition: transform .2s;
}
.gk-panel[open] > summary .gk-chev { transform: rotate(-135deg); }

.gk-panel-body { padding: 4px 18px 20px; border-top: 1px solid var(--gk-line-soft); }

/* ---------------------------------------------------------------------- fx */

.gk-fx-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(215px, 1fr));
  gap: 14px;
  padding-top: 18px;
}

.gk-fx-card {
  background: var(--gk-bg-2);
  border: 1px solid var(--gk-line-soft);
  border-radius: var(--gk-radius-sm);
  padding: 14px;
}
.gk-fx-card-wide { grid-column: 1 / -1; }

.gk-fx-head { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; }
.gk-fx-head h3 { font-size: 0.92rem; }

.gk-fx-controls { display: flex; flex-direction: column; gap: 3px; }
.gk-fx-controls label { margin-top: 6px; }
.gk-fx-controls output { color: var(--gk-teal); }

.gk-comp-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 4px 18px;
}

/* Toggle switch */
.gk-switch { position: relative; display: inline-block; flex: none; }
.gk-switch input { position: absolute; opacity: 0; width: 0; height: 0; }
.gk-switch span {
  display: block;
  width: 38px; height: 21px;
  background: var(--gk-line);
  border-radius: 11px;
  cursor: pointer;
  transition: background .18s;
}
.gk-switch span::after {
  content: '';
  position: absolute;
  top: 3px; left: 3px;
  width: 15px; height: 15px;
  background: #7d8892;
  border-radius: 50%;
  transition: transform .18s, background .18s;
}
.gk-switch input:checked + span { background: rgba(45,212,191,.3); }
.gk-switch input:checked + span::after {
  transform: translateX(17px);
  background: var(--gk-teal);
  box-shadow: 0 0 8px var(--gk-teal-glow);
}
.gk-switch input:focus-visible + span { outline: 2px solid var(--gk-teal); outline-offset: 2px; }

/* ----------------------------------------------------------------- panning */

.gk-pan-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 16px 24px;
  padding-top: 18px;
}
.gk-pan-item { display: flex; flex-direction: column; gap: 2px; }
.gk-pan-label { display: flex; justify-content: space-between; align-items: baseline; }
.gk-pan-name { font-size: 0.85rem; font-weight: 600; }
.gk-pan-val {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--gk-teal);
}
.gk-pan-scale {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.6rem;
  color: var(--gk-text-3);
  padding: 0 2px;
}

/* ------------------------------------------------------------------- prefs */

.gk-prefs {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 28px;
  padding-top: 18px;
}
.gk-pref-col h3 { font-size: 0.92rem; margin-bottom: 12px; }

.gk-check {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 12px;
  font-size: 0.86rem;
  color: var(--gk-text-2);
  cursor: pointer;
}
.gk-check input { accent-color: var(--gk-teal); width: 16px; height: 16px; margin-top: 1px; }
.gk-check:hover { color: var(--gk-text); }

.gk-keylist { list-style: none; margin: 0; padding: 0; }
.gk-keylist li {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 5px 0;
  font-size: 0.82rem;
  color: var(--gk-text-2);
  border-bottom: 1px solid var(--gk-line-soft);
}
.gk-keylist li span { margin-left: auto; text-align: right; }

/* ---------------------------------------------------------------- tooltips */

[data-tip] { position: relative; }
[data-tip]:hover::after {
  content: attr(data-tip);
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  z-index: 40;
  padding: 6px 10px;
  background: #05070a;
  border: 1px solid var(--gk-line);
  border-radius: 6px;
  color: var(--gk-text);
  font-family: var(--font-body);
  font-size: 0.74rem;
  font-weight: 500;
  white-space: nowrap;
  pointer-events: none;
  box-shadow: 0 6px 20px rgba(0,0,0,.6);
}
body.no-tooltips [data-tip]:hover::after { display: none; }

/* ------------------------------------------------------------------- toast */

.gk-toast {
  position: fixed;
  left: 50%;
  bottom: 26px;
  transform: translate(-50%, 20px);
  padding: 10px 20px;
  background: var(--gk-panel-2);
  border: 1px solid var(--gk-teal);
  border-radius: 40px;
  color: var(--gk-text);
  font-size: 0.84rem;
  font-weight: 600;
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s, transform .2s;
  z-index: 100;
}
.gk-toast.show { opacity: 1; transform: translate(-50%, 0); }

/* -------------------------------------------------------------- responsive */

@media (max-width: 900px) {
  .gk-app { padding: 14px 12px 50px; }
  .gk-header { gap: 16px; padding: 14px; }
  .gk-transport { width: 100%; }
  .gk-field { min-width: 100px; flex: 1; }
  .gk-row { grid-template-columns: 210px 1fr; gap: 10px; }
  .gk-grid { min-width: 760px; }
}

@media (max-width: 640px) {
  .gk-logo { height: 38px; }
  /* Keep the site logo; drop the secondary tool label so the header stays tidy. */
  .gk-brand-divider, .gk-tool-name { display: none; }
  .gk-btn-play { min-width: 88px; }
  .gk-patternbar { flex-direction: column; align-items: stretch; }
  .gk-pattern-tabs .gk-tab { flex: 1; padding: 8px 6px; font-size: 0.75rem; }
  .gk-panel-body { padding-left: 12px; padding-right: 12px; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}