@font-face {
  font-family: 'Martian Mono';
  src: url('../fonts/MartianMono.ttf') format('truetype');
  font-style: normal;
  font-weight: 400;
  font-display: swap;
}

@font-face {
  font-family: 'Xanh Mono';
  src: url('../fonts/XanhMono-Regular.ttf') format('truetype');
  font-style: normal;
  font-weight: 400;
  font-display: swap;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  color-scheme: dark;
  --black: #000000;
  --white: #eae9e5;
  --surface: rgba(19, 19, 19, 0.84);
  --surface-strong: rgba(19, 19, 19, 0.94);
  --surface-hover: rgba(234, 233, 229, 0.08);
  --line: rgba(234, 233, 229, 0.1);
  --line-strong: rgba(234, 233, 229, 0.18);
  --dim: rgba(234, 233, 229, 0.42);
  --quiet: rgba(234, 233, 229, 0.2);
  --panel-radius: 2rem;
  --panel-shadow: 0 1.2rem 4rem rgba(0, 0, 0, 0.44), inset 0 1px rgba(255, 255, 255, 0.035);
  font-family: 'Martian Mono', monospace;
  font-size: 11px;
  font-weight: 400;
}

html,
body,
#instrument {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: var(--black);
}

body {
  color: var(--white);
  overscroll-behavior: none;
  -webkit-font-smoothing: antialiased;
}

button,
select,
input {
  color: inherit;
  font: inherit;
}

button,
select {
  border: 0;
  border-radius: var(--panel-radius);
  background: none;
}

button,
select,
input[type='checkbox'],
input[type='color'] {
  cursor: pointer;
}

button:focus-visible,
select:focus-visible,
input:focus-visible,
a:focus-visible {
  outline: 1px solid var(--white);
  outline-offset: 4px;
}

#visual {
  position: fixed;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
  background: var(--black);
}

#start-screen {
  position: fixed;
  z-index: 20;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 3rem 2rem 11rem;
  background:
    radial-gradient(circle at 50% 47%, rgba(0, 0, 0, 0.04) 0%, rgba(0, 0, 0, 0.34) 42%, rgba(0, 0, 0, 0.84) 100%),
    linear-gradient(180deg, rgba(0, 0, 0, 0.42), rgba(0, 0, 0, 0.08) 48%, rgba(0, 0, 0, 0.62));
  opacity: 1;
  visibility: visible;
  transition: opacity 650ms ease, visibility 0s linear 0s;
}

#start-screen.is-dismissed {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 650ms ease, visibility 0s linear 650ms;
}

.start-object {
  display: grid;
  justify-items: center;
  width: min(90vw, 620px);
  text-align: center;
  text-wrap: balance;
}

.start-eyebrow {
  margin-bottom: 1.25rem;
  color: var(--dim);
  font-size: 0.7rem;
  letter-spacing: 0.22em;
}

.start-object h1 {
  max-width: 19ch;
  font-family: 'Xanh Mono', 'Martian Mono', monospace;
  font-size: clamp(3rem, 4vw, 4rem);
  font-weight: 400;
  letter-spacing: -0.04em;
  line-height: 1.08;
}

.start-intro {
  max-width: 62ch;
  margin-top: 1.6rem;
  color: rgba(234, 233, 229, 0.62);
  font-size: 0.86rem;
  letter-spacing: -0.01em;
  line-height: 1.65;
}

#start-audio {
  min-width: 13rem;
  min-height: 4.4rem;
  margin-top: 2.4rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--panel-radius);
  padding: 1rem 1.8rem;
  background: var(--surface);
  box-shadow: var(--panel-shadow);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  letter-spacing: 0.12em;
  transition: color 180ms ease, background-color 180ms ease, border-color 180ms ease, transform 180ms ease;
}

#start-audio:not(:disabled):hover {
  color: var(--black);
  background: var(--white);
  border-color: var(--white);
  transform: translateY(-2px);
}

#start-audio:disabled {
  color: var(--quiet);
  border-color: var(--line);
  cursor: wait;
}

#start-message {
  min-height: 1.4em;
  margin-top: 1rem;
  color: var(--dim);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  line-height: 1.5;
}

.start-links {
  position: fixed;
  right: 2rem;
  bottom: max(1.8rem, env(safe-area-inset-bottom));
  left: 2rem;
  display: flex;
  justify-content: center;
  gap: 1.8rem;
}

.start-links a {
  color: var(--quiet);
  font-size: 0.62rem;
  letter-spacing: 0.11em;
  text-decoration: none;
  transition: color 160ms ease;
}

.start-links a:hover,
.start-links a:focus-visible {
  color: var(--white);
}

#start-screen noscript {
  position: fixed;
  right: 2rem;
  bottom: 5.2rem;
  left: 2rem;
  color: var(--dim);
  font-size: 0.72rem;
  line-height: 1.6;
  text-align: center;
}

#start-screen noscript a {
  color: var(--white);
}

.start-source-picker {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.1rem;
  margin-top: 1.5rem;
  color: var(--quiet);
  font-size: 0.64rem;
  letter-spacing: 0.08em;
}

.start-source-picker button {
  min-height: 2.6rem;
  padding-inline: 0.3rem;
  border-radius: 0;
  color: var(--dim);
  font-size: inherit;
  letter-spacing: inherit;
  outline: 0;
}

.start-source-picker button:hover,
.start-source-picker button:focus-visible {
  color: var(--white);
  outline: 0;
}

.start-source-picker button[aria-pressed='true'] {
  color: var(--white);
  box-shadow: inset 0 -1px var(--white);
}

#interface {
  position: fixed;
  z-index: 10;
  inset: 0;
  pointer-events: none;
}

#interface:has(#settings.is-open) {
  z-index: 21;
}

#bottom-bar {
  position: absolute;
  bottom: max(1.8rem, env(safe-area-inset-bottom));
  left: 50%;
  display: flex;
  align-items: center;
  width: max-content;
  max-width: calc(100vw - 2.4rem);
  min-height: 5.6rem;
  padding: 0.8rem 1rem;
  border: 1px solid var(--line);
  border-radius: var(--panel-radius);
  background: var(--surface);
  box-shadow: var(--panel-shadow);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  opacity: 1;
  transform: translateX(-50%);
  transition: opacity 280ms ease, transform 280ms ease;
}

#bottom-bar > * {
  pointer-events: auto;
}

#bottom-bar button,
#bottom-bar select,
#bottom-bar output {
  color: var(--dim);
  font-size: 0.9rem;
  letter-spacing: 0.08em;
  transition: color 180ms ease;
}

#bottom-bar button:hover,
#bottom-bar select:hover {
  color: var(--white);
}

.bar-rule {
  width: 1px;
  height: 2.8rem;
  margin-inline: 0.35rem;
  background: var(--line);
}

.scene-control {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 15rem;
  min-height: 4rem;
  padding-inline: 1.4rem;
  white-space: nowrap;
  pointer-events: auto;
}

#scene-picker-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  width: 100%;
  max-width: 17rem;
  min-height: 4rem;
  padding-inline: 1.2rem;
  border: 0;
  color: var(--white) !important;
  background: transparent;
  text-align: center;
  outline: 0;
  box-shadow: none;
}

#scene-picker-toggle:hover,
#scene-picker-toggle:focus-visible {
  color: var(--white);
  background: var(--surface-hover);
  outline: 0;
  box-shadow: none;
}

.scene-picker-caret {
  width: 0.65rem;
  height: 0.65rem;
  margin-top: -0.35rem;
  border-right: 1px solid currentColor;
  border-bottom: 1px solid currentColor;
  opacity: 0.65;
  transform: rotate(45deg);
  transition: transform 180ms ease, margin 180ms ease;
}

#scene-picker-toggle[aria-expanded='true'] .scene-picker-caret {
  margin-top: 0.35rem;
  transform: rotate(225deg);
}

.native-scene-select {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  clip-path: inset(50%);
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
}

#scene-wheel {
  position: absolute;
  z-index: 5;
  bottom: calc(100% + 1.2rem);
  left: 50%;
  display: grid;
  width: 19rem;
  padding: 1rem;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--panel-radius);
  background: var(--surface-strong);
  box-shadow: var(--panel-shadow);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translate(-50%, 0.8rem) perspective(32rem) rotateX(-4deg);
  transform-origin: bottom center;
  transition: opacity 180ms ease, transform 220ms ease, visibility 0s linear 220ms;
}

#scene-wheel::before,
#scene-wheel::after {
  position: absolute;
  z-index: 2;
  right: 0;
  left: 0;
  height: 4.2rem;
  content: '';
  pointer-events: none;
}

#scene-wheel::before {
  top: 0;
  background: linear-gradient(to bottom, var(--surface-strong), transparent);
}

#scene-wheel::after {
  bottom: 0;
  background: linear-gradient(to top, var(--surface-strong), transparent);
}

#scene-wheel.is-open {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translate(-50%, 0) perspective(32rem) rotateX(0);
  transition: opacity 180ms ease, transform 220ms ease, visibility 0s;
}

.scene-wheel-option {
  position: relative;
  z-index: 1;
  min-height: 3.15rem;
  padding: 0.4rem 1rem;
  border: 0;
  border-radius: 0;
  color: var(--white);
  background: transparent;
  font-size: 0.84rem;
  letter-spacing: 0.1em;
  outline: 0;
  box-shadow: none;
  transform-origin: center;
  transition: color 180ms ease, opacity 180ms ease, transform 220ms ease;
}

.scene-wheel-option[data-offset='0'] {
  color: var(--white);
  opacity: 1;
  transform: scale(1.06);
}

.scene-wheel-option[data-offset='-1'] {
  opacity: 0.52;
  transform: perspective(18rem) rotateX(18deg) scale(0.88);
}

.scene-wheel-option[data-offset='1'] {
  opacity: 0.52;
  transform: perspective(18rem) rotateX(-18deg) scale(0.88);
}

.scene-wheel-option[data-offset='-2'] {
  opacity: 0.19;
  transform: perspective(18rem) rotateX(34deg) scale(0.72);
}

.scene-wheel-option[data-offset='2'] {
  opacity: 0.19;
  transform: perspective(18rem) rotateX(-34deg) scale(0.72);
}

.scene-wheel-option:hover {
  color: var(--white);
  opacity: 0.82;
}

.scene-wheel-option:focus-visible {
  outline: 0;
  box-shadow: none;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

input[type='color'] {
  width: 1.8rem;
  height: 1.8rem;
  padding: 0;
  overflow: hidden;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  background: transparent;
}

input[type='color']::-webkit-color-swatch-wrapper {
  padding: 0;
}

input[type='color']::-webkit-color-swatch {
  border: 0;
  border-radius: 50%;
}

input[type='color']::-moz-color-swatch {
  border: 0;
  border-radius: 50%;
}

#audio-status {
  display: inline-flex;
  align-items: center;
  gap: 0.85rem;
  padding: 1rem;
  letter-spacing: 0.12em !important;
}

.status-dot {
  width: 1.2rem;
  height: 1.2rem;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  background: transparent;
}

body.is-live .status-dot {
  border-color: rgba(126, 216, 151, 0.76);
  background: rgba(126, 216, 151, 0.86);
  animation: live-pulse 1.8s ease-in-out infinite;
}

body.is-paused .status-dot {
  background: transparent;
  box-shadow: inset 0 0 0 1px var(--dim);
  animation: none;
}

#settings-toggle {
  min-height: 4.2rem;
  padding-inline: 1.2rem;
  border-radius: var(--panel-radius);
}

#settings-toggle:hover {
  background: var(--surface-hover);
}

@keyframes live-pulse {
  0%, 100% { opacity: 0.36; transform: scale(0.82); }
  50% { opacity: 1; transform: scale(1); }
}

#settings {
  position: absolute;
  bottom: max(9.2rem, calc(env(safe-area-inset-bottom) + 8rem));
  left: 50%;
  width: min(92vw, 520px);
  max-height: calc(100vh - 12rem);
  padding: 2.2rem;
  border: 1px solid var(--line);
  border-radius: var(--panel-radius);
  background: var(--surface-strong);
  box-shadow: var(--panel-shadow);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  overflow-y: auto;
  scrollbar-color: var(--line-strong) transparent;
  scrollbar-width: thin;
  transform: translate(-50%, 0.8rem);
  transition: opacity 180ms ease, transform 180ms ease, visibility 0s linear 180ms;
}

#settings.is-open {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translate(-50%, 0);
  transition: opacity 180ms ease, transform 180ms ease, visibility 0s;
}

.settings-heading,
.control-row {
  display: grid;
  grid-template-columns: minmax(9rem, 1fr) minmax(12rem, 1.35fr) 4rem;
  align-items: center;
  gap: 1.4rem;
}

.settings-heading {
  margin-bottom: 1.4rem;
}

.settings-heading h2,
.settings-heading button,
.control-row > span,
.control-row output {
  font-size: 0.86rem;
  font-weight: 400;
  letter-spacing: 0.1em;
}

.settings-heading h2 {
  grid-column: 1 / 3;
}

.settings-heading button {
  color: var(--dim);
  justify-self: end;
  min-height: 3.6rem;
  padding-inline: 1.2rem;
  border: 1px solid transparent;
}

.settings-heading button:hover {
  color: var(--white);
  border-color: var(--line);
  background: var(--surface-hover);
}

.control-row {
  min-height: 4.2rem;
  border-top: 1px solid var(--line);
}

.settings-group {
  margin: 2rem 0 0.7rem;
  color: var(--quiet);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  line-height: 1.4;
}

.settings-heading + .settings-group {
  margin-top: 0;
}

.advanced-settings {
  margin-top: 1.2rem;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.advanced-settings-toggle {
  display: grid;
  grid-template-columns: 1fr auto 1.4rem;
  align-items: center;
  gap: 1rem;
  width: 100%;
  min-height: 4.8rem;
  padding: 0;
  border: 0;
  color: var(--dim);
  background: transparent;
  cursor: pointer;
  text-align: left;
  transition: color 160ms ease, background 160ms ease;
}

.advanced-settings-toggle:hover,
.advanced-settings-toggle:focus-visible,
.advanced-settings.is-open .advanced-settings-toggle {
  color: var(--white);
}

.advanced-settings-toggle:focus-visible {
  outline: 0;
  box-shadow: inset 0 0 0 1px var(--line-strong);
}

.advanced-settings-toggle > span {
  font-size: 0.82rem;
  letter-spacing: 0.1em;
}

.advanced-settings-toggle small {
  color: var(--quiet);
  font-size: 0.6rem;
  font-weight: 400;
  letter-spacing: 0.11em;
}

.advanced-settings-toggle i {
  justify-self: end;
  width: 0.6rem;
  height: 0.6rem;
  margin-top: -0.3rem;
  border-right: 1px solid currentColor;
  border-bottom: 1px solid currentColor;
  opacity: 0.7;
  transform: rotate(45deg);
  transition: transform 180ms ease, margin 180ms ease;
}

.advanced-settings.is-open .advanced-settings-toggle i {
  margin-top: 0.3rem;
  transform: rotate(225deg);
}

.advanced-settings-content {
  padding-bottom: 1rem;
  animation: advanced-reveal 180ms ease both;
}

.advanced-settings-content[hidden] {
  display: none;
}

.advanced-settings-content .settings-group:first-child {
  margin-top: 1rem;
}

@keyframes advanced-reveal {
  from { opacity: 0; transform: translateY(-0.4rem); }
  to { opacity: 1; transform: translateY(0); }
}

.control-row output {
  justify-self: end;
  color: var(--dim);
}

.control-row > input[type='color'] {
  grid-column: 2 / 4;
  justify-self: end;
}

.setting-picker-row {
  position: relative;
  z-index: 1;
}

.setting-picker-row:has(.setting-picker.is-open) {
  z-index: 8;
}

.setting-picker {
  position: relative;
  grid-column: 2 / 4;
  width: 100%;
}

.setting-picker-toggle {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 1rem;
  width: 100%;
  min-height: 3.2rem;
  padding: 0.6rem 1rem;
  color: var(--white);
  border: 1px solid var(--line);
  background: transparent;
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  outline: 0;
  box-shadow: none;
}

.setting-picker-toggle:hover,
.setting-picker-toggle:focus-visible,
.setting-picker.is-open .setting-picker-toggle {
  color: var(--white);
  border-color: var(--line-strong);
  background: var(--surface-hover);
  outline: 0;
  box-shadow: none;
}

.setting-picker-caret {
  width: 0.55rem;
  height: 0.55rem;
  margin-top: -0.3rem;
  border-right: 1px solid currentColor;
  border-bottom: 1px solid currentColor;
  opacity: 0.6;
  transform: rotate(45deg);
  transition: transform 180ms ease, margin 180ms ease;
}

.setting-picker.is-open .setting-picker-caret {
  margin-top: 0.3rem;
  transform: rotate(225deg);
}

.native-setting-select {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  clip-path: inset(50%);
  opacity: 0;
  pointer-events: none;
}

.setting-wheel {
  position: absolute;
  z-index: 9;
  top: calc(100% + 0.65rem);
  right: 0;
  display: grid;
  width: min(22rem, 100%);
  padding: 0.75rem;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--panel-radius);
  background: var(--surface-strong);
  box-shadow: var(--panel-shadow);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateY(-0.5rem) perspective(30rem) rotateX(5deg);
  transform-origin: top center;
  transition: opacity 160ms ease, transform 200ms ease, visibility 0s linear 200ms;
}

.setting-wheel::before,
.setting-wheel::after {
  position: absolute;
  z-index: 2;
  right: 0;
  left: 0;
  height: 3.5rem;
  content: '';
  pointer-events: none;
}

.setting-wheel::before {
  top: 0;
  background: linear-gradient(to bottom, var(--surface-strong), transparent);
}

.setting-wheel::after {
  bottom: 0;
  background: linear-gradient(to top, var(--surface-strong), transparent);
}

.setting-picker.is-open .setting-wheel {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateY(0) perspective(30rem) rotateX(0);
  transition: opacity 160ms ease, transform 200ms ease, visibility 0s;
}

.setting-wheel-option {
  position: relative;
  z-index: 1;
  min-height: 3rem;
  padding: 0.35rem 0.8rem;
  border: 0;
  border-radius: 0;
  color: var(--white);
  background: transparent;
  font-size: 0.78rem;
  letter-spacing: 0.09em;
  outline: 0;
  box-shadow: none;
  transform-origin: center;
  transition: opacity 160ms ease, transform 200ms ease;
}

.setting-wheel-option[data-offset='0'] {
  opacity: 1;
  transform: scale(1.04);
}

.setting-wheel-option[data-offset='-1'] {
  opacity: 0.38;
  transform: perspective(16rem) rotateX(22deg) scale(0.84);
}

.setting-wheel-option[data-offset='1'] {
  opacity: 0.38;
  transform: perspective(16rem) rotateX(-22deg) scale(0.84);
}

.setting-wheel-option[data-offset='-2'] {
  opacity: 0.13;
  transform: perspective(16rem) rotateX(38deg) scale(0.7);
}

.setting-wheel-option[data-offset='2'] {
  opacity: 0.13;
  transform: perspective(16rem) rotateX(-38deg) scale(0.7);
}

.setting-wheel-option:hover {
  opacity: 0.8;
}

.setting-wheel-option:focus-visible {
  outline: 0;
  box-shadow: none;
}

.glyph-palette-row {
  padding-block: 1.15rem;
  align-items: start;
}

.glyph-palette-row > span {
  padding-top: 0.8rem;
}

.glyph-palette-editor {
  grid-column: 2 / 4;
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.65rem;
}

.glyph-color-stop {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  min-height: 3.2rem;
  padding: 0.55rem 0.9rem 0.55rem 0.55rem;
  color: var(--dim);
  border: 1px solid var(--line);
  border-radius: var(--panel-radius);
  background: transparent;
  cursor: pointer;
  transition: color 160ms ease, border-color 160ms ease, background 160ms ease;
}

.glyph-color-stop[hidden],
.glyph-palette-actions button[hidden] {
  display: none;
}

.glyph-color-stop:hover {
  color: var(--white);
  border-color: var(--line-strong);
  background: var(--surface-hover);
}

.glyph-color-stop span {
  font-size: 0.66rem;
  letter-spacing: 0.08em;
}

.glyph-color-stop input[type='color'] {
  width: 1.65rem;
  height: 1.65rem;
  flex: 0 0 auto;
}

.glyph-palette-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.65rem;
  width: 100%;
}

.glyph-palette-actions button {
  min-height: 3rem;
  padding-inline: 1rem;
  color: var(--dim);
  border: 1px solid var(--line);
  background: transparent;
  font-size: 0.68rem;
  letter-spacing: 0.08em;
}

.glyph-palette-actions button:hover {
  color: var(--white);
  border-color: var(--line-strong);
  background: var(--surface-hover);
}

.glyph-palette-actions button:disabled {
  opacity: 0.35;
  cursor: default;
}

.action-row button {
  grid-column: 2 / 4;
  justify-self: end;
  min-height: 3.2rem;
  padding-inline: 1.2rem;
  color: var(--dim);
  border: 1px solid var(--line);
  background: transparent;
  letter-spacing: 0.08em;
}

.button-cluster {
  grid-column: 2 / 4;
  display: flex;
  justify-content: flex-end;
  gap: 0.7rem;
}

.action-row .button-cluster button {
  grid-column: auto;
  justify-self: auto;
}

.action-row button[aria-pressed='true'] {
  color: var(--black);
  border-color: var(--white);
  background: var(--white);
}

.action-row button:disabled {
  opacity: 0.26;
  cursor: default;
}

.action-row button:hover {
  color: var(--white);
  background: var(--surface-hover);
}

.action-row button[aria-pressed='true']:hover {
  color: var(--black);
  background: var(--white);
}

.settings-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.7rem;
  margin-top: 2rem;
}

.settings-actions button {
  min-height: 4rem;
  border: 1px solid var(--line);
  color: var(--dim);
  background: transparent;
  letter-spacing: 0.1em;
}

.settings-actions button:hover {
  color: var(--white);
  background: var(--surface-hover);
}

input[type='range'] {
  width: 100%;
  height: 1px;
  appearance: none;
  background: rgba(234, 233, 229, 0.35);
}

input[type='range']::-webkit-slider-thumb {
  width: 10px;
  height: 10px;
  appearance: none;
  border-radius: 50%;
  background: var(--white);
}

input[type='range']::-moz-range-thumb {
  width: 10px;
  height: 10px;
  border: 0;
  border-radius: 50%;
  background: var(--white);
}

input[type='checkbox'] {
  grid-column: 2 / 4;
  justify-self: end;
  width: 1.15rem;
  height: 1.15rem;
  appearance: none;
  border: 1px solid var(--dim);
  border-radius: var(--panel-radius);
}

input[type='checkbox']:checked {
  background: var(--white);
  box-shadow: inset 0 0 0 3px var(--black);
}

.key-guide {
  margin-top: 2.2rem;
  color: var(--quiet);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  line-height: 1.8;
}

#capture-status {
  position: fixed;
  z-index: 30;
  top: max(2rem, env(safe-area-inset-top));
  left: 50%;
  padding: 1.1rem 1.5rem;
  border: 1px solid var(--line);
  border-radius: var(--panel-radius);
  color: var(--white);
  background: var(--surface);
  box-shadow: var(--panel-shadow);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, -0.8rem);
  transition: opacity 180ms ease, transform 180ms ease;
}

#capture-status.is-visible {
  opacity: 1;
  transform: translate(-50%, 0);
}

#audio-diagnostics {
  position: fixed;
  z-index: 12;
  top: max(2rem, env(safe-area-inset-top));
  left: 2rem;
  display: grid;
  width: min(32rem, calc(100vw - 4rem));
  padding: 1.5rem;
  border: 1px solid var(--line);
  border-radius: var(--panel-radius);
  background: var(--surface-strong);
  box-shadow: var(--panel-shadow);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateY(-0.7rem);
  transition: opacity 180ms ease, transform 180ms ease, visibility 0s linear 180ms;
}

#audio-diagnostics.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  transition: opacity 180ms ease, transform 180ms ease, visibility 0s;
}

.diagnostic-heading,
.diagnostic-footer,
.diagnostic-row {
  display: grid;
  align-items: center;
  font-size: 0.68rem;
  letter-spacing: 0.1em;
}

.diagnostic-heading,
.diagnostic-footer {
  grid-template-columns: 1fr auto;
}

.diagnostic-heading {
  margin-bottom: 1rem;
  color: var(--dim);
}

.diagnostic-row {
  grid-template-columns: 5.6rem 1fr 5.4rem;
  gap: 0.9rem;
  min-height: 2.5rem;
  color: var(--dim);
}

.diagnostic-row i {
  position: relative;
  height: 1px;
  overflow: visible;
  background: var(--line-strong);
}

.diagnostic-row i b {
  position: absolute;
  inset: -1px 0 auto;
  height: 3px;
  border-radius: var(--panel-radius);
  background: var(--white);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 45ms linear;
}

.diagnostic-row i em {
  position: absolute;
  top: -0.35rem;
  width: 1px;
  height: 0.7rem;
  background: var(--dim);
  transform: translateX(-0.5px);
}

.diagnostic-row output {
  justify-self: end;
  color: var(--white);
}

.diagnostic-footer {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  color: var(--dim);
}

.diagnostic-events {
  display: flex;
  align-items: center;
  gap: 1rem;
  min-height: 2.8rem;
  color: var(--quiet);
  font-size: 0.64rem;
  letter-spacing: 0.1em;
}

.diagnostic-events span {
  transition: color 60ms linear, opacity 120ms ease;
}

.diagnostic-events span.is-active {
  color: var(--white);
  opacity: 1;
}

.diagnostic-events output {
  margin-left: auto;
}

.diagnostic-engine {
  color: var(--quiet);
  font-size: 0.58rem;
  letter-spacing: 0.08em;
  line-height: 1.5;
}

body.ui-hidden #bottom-bar,
body.ui-idle #bottom-bar {
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, 0.8rem);
}

body:not(.instrument-started) #bottom-bar {
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, 0.8rem);
}

body.ui-hidden #settings {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

@media (max-width: 560px) {
  :root { font-size: 10px; }
  #start-screen { padding-bottom: 8rem; }
  .start-object h1 { font-size: clamp(3rem, 9.5vw, 4rem); }
  .start-intro { max-width: 34ch; }
  .start-links { bottom: max(1rem, env(safe-area-inset-bottom)); }
  .start-source-picker { gap: 0.75rem; }
  #bottom-bar {
    bottom: max(1.2rem, env(safe-area-inset-bottom));
    width: calc(100vw - 2.4rem);
    min-height: 5.6rem;
    justify-content: space-between;
    padding-inline: 0.8rem;
  }
  .bar-rule,
  .status-copy { display: none; }
  #audio-status { padding-inline: 0.8rem; }
  .scene-control { min-width: 11rem; padding-inline: 0.6rem; }
  #scene-picker-toggle { max-width: 11rem; padding-inline: 0.8rem; }
  #scene-wheel { width: 17rem; }
  input[type='color'] { width: 1.7rem; height: 1.7rem; }
  #settings-toggle { padding-inline: 0.8rem; }
  #settings {
    bottom: max(8rem, calc(env(safe-area-inset-bottom) + 7rem));
    padding: 1.6rem;
  }
  .settings-heading,
  .control-row { grid-template-columns: minmax(8rem, 1fr) minmax(9rem, 1.2fr) 3.5rem; gap: 0.8rem; }
  .advanced-settings-toggle {
    grid-template-columns: 1fr auto 1.2rem;
    gap: 0.7rem;
  }
  .advanced-settings-toggle small { font-size: 0.56rem; }
  .key-guide { display: none; }
  #audio-diagnostics {
    top: 1.2rem;
    left: 1.2rem;
    width: calc(100vw - 2.4rem);
  }
}

@media (prefers-reduced-motion: reduce) {
  #start-screen,
  #bottom-bar,
  #settings { transition-duration: 0.01ms; }
  .advanced-settings-content { animation: none; }
  .status-dot { animation: none !important; }
}