:root,
[data-theme="light"] {
  --bg: #f4f4f2;
  --bg-elev: #ffffff;
  --ink: #111111;
  --muted: #5a5a58;
  --line: #deded9;
  --line-strong: #bdbdb6;
  --accent: #1f6feb;
  --accent-ink: #ffffff;
  --danger: #c62828;
  --ok: #1b7f4a;
  --shadow: 0 10px 40px rgb(17 17 17 / 7%);
  --rail: #d4d4ce;
  --knob: #ffffff;
  --menu: #ffffff;
}

[data-theme="dark"] {
  --bg: #0e0f12;
  --bg-elev: #16181d;
  --ink: #f3f3f1;
  --muted: #9b9ba2;
  --line: #2a2d35;
  --line-strong: #404552;
  --accent: #4c8dff;
  --accent-ink: #0b1020;
  --danger: #ff6b6b;
  --ok: #3dd68c;
  --shadow: 0 14px 44px rgb(0 0 0 / 45%);
  --rail: #2f333d;
  --knob: #f3f3f1;
  --menu: #1c1f26;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  color-scheme: light dark;
  background: var(--bg);
  min-height: 100%;
}

/* Theme animation = one full-page crossfade. No per-element color transitions. */
@media (prefers-reduced-motion: no-preference) {
  ::view-transition-old(root),
  ::view-transition-new(root) {
    animation-duration: 0.4s;
    animation-timing-function: ease;
  }
}

html,
body {
  margin: 0;
  min-height: 100%;
  background: var(--bg);
  color: var(--ink);
  font-family: "Source Sans 3", system-ui, sans-serif;
  font-size: 18px;
  line-height: 1.4;
}

.app {
  width: min(1120px, calc(100% - 2.5rem));
  margin: 0 auto;
  padding: 2rem 0 4rem;
  min-height: calc(100vh - 4rem);
}

.bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem 1.25rem;
  padding: 1.15rem 1.35rem;
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: var(--shadow);
}

.bar-brand {
  display: flex;
  align-items: baseline;
  gap: 0.55rem;
  margin-right: auto;
}

.logo {
  font-family: Sora, sans-serif;
  font-weight: 700;
  font-size: 1.55rem;
  letter-spacing: -0.04em;
}

.logo-sub {
  font-family: Sora, sans-serif;
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--muted);
}

.bar-status {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.92rem;
  color: var(--muted);
}

.dot {
  font-size: 0.55rem;
  color: var(--line-strong);
}

.dot.on {
  color: var(--ok);
  filter: drop-shadow(0 0 6px color-mix(in srgb, var(--ok) 55%, transparent));
}

.bar-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}

.icon-btn {
  appearance: none;
  position: relative;
  width: 3rem;
  height: 3rem;
  border-radius: 12px;
  border: 1px solid var(--line-strong);
  background: var(--bg-elev);
  color: var(--ink);
  cursor: pointer;
  font-size: 1.05rem;
  display: grid;
  place-items: center;
  transition: transform 0.18s ease;
}

.icon-btn:hover:not(:disabled) {
  transform: translateY(-1px);
  border-color: var(--ink);
}

.icon-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.icon-btn.solid {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-ink);
}

.icon-btn.danger {
  color: var(--danger);
  border-color: color-mix(in srgb, var(--danger) 40%, var(--line));
}

.icon-btn .icon-sun,
.icon-btn .icon-moon {
  position: absolute;
}

.icon-btn .icon-sun {
  opacity: 0;
  transform: rotate(-20deg) scale(0.7);
}

.icon-btn .icon-moon {
  opacity: 1;
  transform: none;
}

[data-theme="dark"] .icon-btn .icon-sun {
  opacity: 1;
  transform: none;
}

[data-theme="dark"] .icon-btn .icon-moon {
  opacity: 0;
  transform: rotate(20deg) scale(0.7);
}

.deck {
  margin-top: 1.35rem;
  display: grid;
  gap: 1.25rem;
}

.deck[data-locked="true"] {
  opacity: 0.42;
  filter: grayscale(0.25);
  pointer-events: none;
}

.block {
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 1.5rem 1.55rem 1.65rem;
  box-shadow: var(--shadow);
}

.block h2 {
  margin: 0 0 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.55rem;
  font-family: Sora, sans-serif;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.block h2 i {
  font-size: 0.95rem;
  color: var(--accent);
}

.grid {
  display: grid;
  gap: 1.45rem;
}

@media (min-width: 800px) {
  .grid {
    grid-template-columns: 1.15fr 1fr;
  }
}

.cell {
  display: grid;
  gap: 0.55rem;
}

.lbl {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--muted);
}

.lbl i {
  width: 1.1rem;
  text-align: center;
  color: var(--accent);
}

.lbl-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}

.val {
  font-family: "IBM Plex Mono", monospace;
  font-size: 1rem;
  font-weight: 500;
}

/* —— Combo (opaque) —— */
.combo {
  position: relative;
  z-index: 5;
}

.combo.open {
  z-index: 30;
}

.combo-trigger {
  appearance: none;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.85rem;
  padding: 0.95rem 1.05rem;
  border-radius: 12px;
  border: 1px solid var(--line-strong);
  background: var(--bg);
  color: var(--ink);
  text-align: left;
  font-size: 1.05rem;
  font-weight: 600;
  cursor: pointer;
}

.combo-trigger:hover,
.combo.open .combo-trigger {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 16%, transparent);
}

.combo-label {
  color: var(--ink);
}

.combo-chevron {
  color: var(--muted);
  font-size: 0.85rem;
}

.combo.open .combo-chevron {
  transform: rotate(180deg);
}

.combo-list {
  position: absolute;
  z-index: 40;
  left: 0;
  right: 0;
  top: calc(100% + 0.4rem);
  margin: 0;
  padding: 0.4rem;
  list-style: none;
  background: var(--menu);
  color: var(--ink);
  border: 1px solid var(--line-strong);
  border-radius: 14px;
  box-shadow: var(--shadow);
  max-height: 18rem;
  overflow: auto;
  opacity: 1;
}

.combo-option {
  padding: 0.8rem 0.9rem;
  border-radius: 10px;
  cursor: pointer;
  font-weight: 600;
  font-size: 1.02rem;
  color: var(--ink);
  background: transparent;
}

.combo-option:hover,
.combo-option.active {
  background: color-mix(in srgb, var(--accent) 14%, var(--menu));
  color: var(--accent);
}

.combo-option[aria-selected="true"] {
  background: var(--accent);
  color: var(--accent-ink);
}

/* —— Slider —— */
.slider {
  user-select: none;
  touch-action: none;
}

.slider-track {
  position: relative;
  height: 2.5rem;
  display: flex;
  align-items: center;
}

.slider-track::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 0.42rem;
  border-radius: 999px;
  background: var(--rail);
}

.slider-fill {
  position: absolute;
  left: 0;
  height: 0.42rem;
  border-radius: 999px;
  background: var(--accent);
  width: 0%;
}

.slider-thumb {
  appearance: none;
  position: absolute;
  width: 1.35rem;
  height: 1.35rem;
  border-radius: 50%;
  border: 2px solid var(--accent);
  background: var(--knob);
  left: 0;
  transform: translateX(-50%);
  cursor: pointer;
  z-index: 2;
  box-shadow: 0 2px 10px rgb(0 0 0 / 14%);
}

.slider.dragging .slider-thumb,
.slider-thumb:hover {
  transform: translateX(-50%) scale(1.08);
}

.slider-ticks {
  display: flex;
  justify-content: space-between;
  padding: 0 0.25rem;
}

.slider-ticks i {
  width: 0.22rem;
  height: 0.4rem;
  border-radius: 2px;
  background: var(--line-strong);
  display: block;
}

.slider-ticks i.on {
  background: var(--accent);
}

/* —— Toggles —— */
.toggles {
  display: grid;
  gap: 0.9rem;
}

@media (min-width: 700px) {
  .toggles {
    grid-template-columns: 1fr 1fr;
  }
}

.toggle {
  appearance: none;
  display: flex;
  align-items: center;
  gap: 1rem;
  width: 100%;
  text-align: left;
  padding: 1.05rem 1.15rem;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: var(--bg);
  color: var(--ink);
  cursor: pointer;
}

.toggle:hover {
  border-color: var(--line-strong);
}

.toggle[data-on="true"] {
  border-color: color-mix(in srgb, var(--accent) 50%, var(--line));
  background: color-mix(in srgb, var(--accent) 9%, var(--bg));
}

.toggle-rail {
  flex: 0 0 3rem;
  width: 3rem;
  height: 1.65rem;
  border-radius: 999px;
  background: var(--rail);
  position: relative;
}

.toggle[data-on="true"] .toggle-rail {
  background: var(--accent);
}

.toggle-knob {
  position: absolute;
  top: 0.18rem;
  left: 0.18rem;
  width: 1.3rem;
  height: 1.3rem;
  border-radius: 50%;
  background: var(--knob);
  box-shadow: 0 2px 6px rgb(0 0 0 / 16%);
  transition: transform 0.2s ease;
}

.toggle[data-on="true"] .toggle-knob {
  transform: translateX(1.3rem);
}

.toggle-copy {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  font-size: 1.05rem;
}

.toggle-copy i {
  color: var(--accent);
  width: 1.2rem;
  text-align: center;
}

.toggle-copy strong {
  font-family: Sora, sans-serif;
  font-weight: 600;
}

.kb-wrap {
  margin: 1.35rem 0 0;
  width: 100%;
}

.kb-preview {
  width: 100%;
  padding: 1.1rem 1rem 1.2rem;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: var(--bg-elev);
  box-shadow: var(--shadow);
}

.kb-board {
  display: grid;
  gap: 0.35rem;
  width: 100%;
}

.kb-row {
  display: flex;
  gap: 0.35rem;
  width: 100%;
}

.kb-key {
  appearance: none;
  position: relative;
  height: 3.1rem;
  min-width: 0;
  margin: 0;
  padding: 0;
  border-radius: 8px;
  border: 1px solid color-mix(in srgb, var(--ink) 12%, transparent);
  cursor: default;
  font-family: Sora, sans-serif;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--ink);
  overflow: hidden;
  transform: translateY(0);
  transition: transform 0.08s ease, filter 0.08s ease;
}

.kb-key.tone-w {
  background: color-mix(in srgb, #f5f5f3 88%, var(--bg-elev));
}

.kb-key.tone-g {
  background: color-mix(in srgb, #8a8a8a 55%, var(--bg-elev));
  color: #f4f4f4;
}

[data-theme="dark"] .kb-key.tone-w {
  background: #d8d8d4;
  color: #1a1a1a;
}

[data-theme="dark"] .kb-key.tone-g {
  background: #5c5c5c;
  color: #f0f0f0;
}

.kb-key::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--led, transparent);
  opacity: 0.85;
  mix-blend-mode: plus-lighter;
  pointer-events: none;
}

[data-theme="light"] .kb-key::before {
  mix-blend-mode: soft-light;
  opacity: 0.9;
}

[data-theme="light"] .kb-key.tone-g::before {
  mix-blend-mode: screen;
  opacity: 0.75;
}

.kb-key span {
  position: relative;
  z-index: 1;
  pointer-events: none;
}

.kb-key.down {
  transform: translateY(2px) scale(0.97);
  filter: brightness(1.25);
  box-shadow: inset 0 0 0 2px color-mix(in srgb, var(--accent) 70%, white);
}

.toast {
  position: fixed;
  left: 50%;
  bottom: 1.5rem;
  transform: translateX(-50%) translateY(130%);
  margin: 0;
  padding: 0.75rem 1.15rem;
  border-radius: 999px;
  background: var(--ink);
  color: var(--bg);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.88rem;
  opacity: 0;
  pointer-events: none;
  z-index: 50;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

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