/* SUIBAN in the family's dress (Gwancheon/Tetra): a dark void, ink and hairlines, no boxes. */
:root {
  --paper: #060607; --ink: #EEF0F0; --soft: rgba(238,240,240,.56); --faint: rgba(238,240,240,.3);
  --line: rgba(238,240,240,.14); --panel: rgba(8,9,10,.9); --accent: #A9C8DA;
  --mono: "SF Mono", ui-monospace, Menlo, monospace;
  --sans: -apple-system, system-ui, "Helvetica Neue", sans-serif;
}
* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; overflow: hidden; background: var(--paper); color: var(--ink); font-family: var(--sans); -webkit-user-select: none; user-select: none; }
canvas { position: fixed; inset: 0; width: 100%; height: 100%; display: block; }
#overlay { cursor: crosshair; touch-action: none; }

.micro { font: 400 9px/1 var(--mono); letter-spacing: .12em; text-transform: uppercase; color: var(--soft); }

.top { position: fixed; top: 0; left: 0; right: 0; display: flex; justify-content: space-between; align-items: flex-start; padding: 22px 24px; pointer-events: none; }
.top > * { pointer-events: auto; }
.brand { display: flex; flex-direction: column; pointer-events: none; }
.logo { width: 150px; height: auto; }
.word { margin-top: 18px; font: 200 40px/1 var(--sans); letter-spacing: -.02em; }
.word span { display: block; margin-top: 8px; font: 400 10px/1.3 var(--sans); letter-spacing: .02em; color: var(--soft); }
.transport { display: flex; gap: 10px; align-items: center; }

select, .btn {
  all: unset; cursor: pointer; font: 400 10px/1 var(--mono); letter-spacing: .1em; text-transform: uppercase;
  padding: 7px 11px; border: 1px solid var(--line); border-radius: 999px; color: var(--soft); transition: color .2s, border-color .2s;
}
select { padding-right: 22px; background-image: linear-gradient(45deg, transparent 50%, currentColor 50%), linear-gradient(135deg, currentColor 50%, transparent 50%); background-position: calc(100% - 12px) 52%, calc(100% - 8px) 52%; background-size: 4px 4px; background-repeat: no-repeat; }
select option { background: var(--paper); color: var(--ink); }
.btn:hover, select:hover, .btn:focus-visible, select:focus-visible { color: var(--ink); border-color: var(--ink); }
.btn.on { color: var(--paper); background: var(--ink); border-color: var(--ink); }

.hint { position: fixed; left: 50%; top: 26px; transform: translateX(-50%); margin: 0; font: 400 10px/1 var(--mono); letter-spacing: .08em; text-transform: uppercase; color: var(--soft); pointer-events: none; transition: opacity 1.6s; white-space: nowrap; }
.hint.gone { opacity: 0; }
.error { position: fixed; left: 16px; right: 16px; top: 50%; text-align: center; color: #f0b9a8; font: 400 12px var(--mono); }

/* faders: a hairline with a small ring */
.fader { display: flex; flex-direction: column; gap: 6px; min-width: 0; }
.fhead { display: flex; justify-content: space-between; gap: 8px; align-items: baseline; }
.fhead em { font: 400 9.5px/1.2 var(--sans); font-style: normal; color: var(--faint); text-align: right; }
input[type=range] { -webkit-appearance: none; appearance: none; width: 100%; height: 14px; margin: 0; background: transparent; cursor: pointer; }
input[type=range]::-webkit-slider-runnable-track { height: 1px; background: var(--faint); }
input[type=range]::-moz-range-track { height: 1px; background: var(--faint); }
input[type=range]::-webkit-slider-thumb { -webkit-appearance: none; width: 9px; height: 9px; margin-top: -4px; border-radius: 50%; background: var(--paper); border: 1px solid var(--ink); }
input[type=range]::-moz-range-thumb { width: 8px; height: 8px; border-radius: 50%; background: var(--paper); border: 1px solid var(--ink); }
input[type=range]:focus-visible { outline: 1px solid var(--accent); outline-offset: 3px; }

/* strip */
.strip { position: fixed; left: 50%; bottom: 26px; transform: translateX(-50%); display: flex; align-items: flex-end; gap: 26px; transition: opacity .4s, transform .4s cubic-bezier(.2,.8,.2,1); }
.fader.compact { width: 108px; }

/* inspector */
.inspector { position: fixed; left: 0; right: 0; bottom: 0; padding: 34px 24px 54px; display: grid; grid-template-columns: 1.1fr repeat(5, minmax(0, 1fr)); background: linear-gradient(to bottom, transparent, var(--panel) 34px); transition: transform 400ms cubic-bezier(.2,.8,.2,1), opacity 400ms; max-height: 62vh; overflow-y: auto; }
.col { padding: 4px 18px; border-left: 1px solid var(--line); display: flex; flex-direction: column; gap: 9px; min-width: 0; }
.col:first-child { border-left: 0; padding-left: 0; }
.title { font: 200 26px/1 var(--sans); letter-spacing: -.01em; }
.sub { font: 400 11px/1.45 var(--sans); color: var(--soft); max-width: 260px; }
.chips { display: flex; flex-wrap: wrap; gap: 2px; }
.chip { all: unset; cursor: pointer; font: 400 9.5px/1 var(--mono); letter-spacing: .08em; text-transform: uppercase; padding: 6px 9px; border: 1px solid transparent; border-radius: 999px; color: var(--soft); transition: color .2s, border-color .2s; }
.chip:hover, .chip:focus-visible { color: var(--ink); }
.chip.on { color: var(--ink); border-color: var(--ink); }

.modes { position: fixed; right: 20px; top: 62px; display: flex; gap: 2px; }

/* modes */
body[data-mode=quiet] .strip, body[data-mode=advanced] .strip { opacity: 0; transform: translate(-50%, 16px); pointer-events: none; }
body:not([data-mode=advanced]) .inspector { transform: translateY(24px); opacity: 0; pointer-events: none; }
body[data-mode=quiet] .transport, body[data-mode=quiet] .word { opacity: 0; pointer-events: none; }
.transport, .word { transition: opacity .5s; }

@media (max-width: 820px) {
  .top { padding: 16px; }
  .logo { width: 120px; }
  .word { font-size: 30px; margin-top: 12px; }
  .transport { flex-wrap: wrap; justify-content: flex-end; max-width: 45%; }
  .hint { display: none; }
  .strip { left: 16px; right: 16px; transform: none; bottom: 52px; gap: 14px; flex-wrap: wrap; justify-content: center; }
  body[data-mode=quiet] .strip, body[data-mode=advanced] .strip { transform: translateY(16px); }
  .fader.compact { width: calc(33% - 10px); }
  .inspector { grid-template-columns: 1fr 1fr; row-gap: 22px; padding: 30px 16px 16px; bottom: 48px; max-height: 52vh; }
  .modes { background: var(--paper); border-radius: 999px; }
  .col:nth-child(odd) { border-left: 0; padding-left: 0; }
  .modes { top: auto; bottom: 12px; right: 50%; transform: translateX(50%); }
}

@media (max-width: 1400px) { .hint { display: none; } }