:root {
  color-scheme: light dark;
  --bg: #f2f4f6; --panel: #fff; --ink: #15212b; --muted: #566573; --rule: #cbd5dd;
  --accent: #0b6b5d; --accent-ink: #fff; --bad: #a3271f; --track: #dde4ea;
  --mono: "Cascadia Mono", Consolas, ui-monospace, "SF Mono", Menlo, monospace;
  --sans: "Segoe UI Variable Text", "Segoe UI", system-ui, -apple-system, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #0e151b; --panel: #151f27; --ink: #dfe8ee; --muted: #93a4b1; --rule: #2a3846; --accent: #4cc9ad; --accent-ink: #06211b; --bad: #ff8a80; --track: #22303b; }
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 1rem/1.5 var(--sans); }
main { max-width: 40rem; margin: 0 auto; padding: 2rem 1rem 3rem; }
.top { display: flex; justify-content: space-between; align-items: baseline; gap: 1rem; }
.lang { font: 600 .8rem var(--mono); padding: .25rem .6rem; }
h1 { font: 700 1.9rem/1.1 var(--mono); letter-spacing: -.02em; margin: 0 0 .5rem; }
.lead { color: var(--muted); max-width: 34rem; margin: 0 0 1.5rem; }
.hint { color: var(--muted); font-size: .875rem; margin: .5rem 0; }
.foot { margin-top: 2rem; }
.error { color: var(--bad); border-left: 3px solid var(--bad); padding: .25rem .75rem; margin: 1rem 0; }

.tabs { display: flex; gap: .5rem; flex-wrap: wrap; margin-bottom: 1rem; }
button, select, input { font: inherit; color: inherit; }
button { background: var(--panel); border: 1px solid var(--rule); border-radius: 6px; padding: .45rem .9rem; cursor: pointer; }
button[aria-pressed="true"] { border-color: var(--accent); box-shadow: inset 0 -3px 0 var(--accent); }
button.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); font-weight: 600; padding: .55rem 1.4rem; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }

.panel { background: var(--panel); border: 1px solid var(--rule); border-radius: 6px; padding: 1rem; display: grid; gap: .75rem; }
label { display: flex; gap: .6rem; align-items: center; flex-wrap: wrap; }
.chk { gap: .4rem; }
fieldset { border: 1px solid var(--rule); border-radius: 6px; display: flex; gap: 1rem; flex-wrap: wrap; margin: 0; }
input:not([type=checkbox]):not([type=file]), select { background: var(--bg); border: 1px solid var(--rule); border-radius: 4px; padding: .35rem .5rem; }
input[type=number] { width: 8.5rem; }

.bar { display: flex; justify-content: space-between; align-items: center; gap: 1rem; flex-wrap: wrap; margin: 1rem 0; }

.secret { display: block; background: #0f1a22; color: #e6f2ee; font: 1.15rem/1.6 var(--mono); padding: 1rem; border-radius: 6px; overflow-wrap: anywhere; user-select: all; }
.actions { display: flex; gap: .5rem; align-items: center; flex-wrap: wrap; margin-top: .5rem; }

.ruler { position: relative; height: .9rem; background: var(--track); border-radius: 2px; margin: 1.6rem 0 .3rem; }
.fill { height: 100%; width: 0; background: var(--accent); transition: width .4s ease-out; }
.tick { position: absolute; top: -4px; bottom: -4px; width: 1px; background: var(--ink); opacity: .55; }
.minmark { position: absolute; top: -9px; bottom: -9px; width: 3px; margin-left: -1px; background: var(--ink); }
.t128 { left: 44.444%; } .t192 { left: 66.667%; } .t256 { left: 88.889%; }
.scale { position: relative; height: 1.1rem; font: .75rem var(--mono); color: var(--muted); }
.scale span { position: absolute; transform: translateX(-50%); }
.l0 { left: 0; transform: none !important; } .l128 { left: 44.444%; } .l192 { left: 66.667%; } .l256 { left: 88.889%; }

dl { display: grid; grid-template-columns: max-content 1fr; gap: .35rem 1rem; margin: 1rem 0; }
dt { color: var(--muted); } dd { margin: 0; font-family: var(--mono); font-size: .9rem; overflow-wrap: anywhere; }
details { margin-top: 1.5rem; } summary { cursor: pointer; }
details label { margin-top: .5rem; }
@media (prefers-reduced-motion: reduce) { .fill { transition: none; } }