:root {
  --ink: #161811; --muted: #6d7165; --paper: #f0efe7; --paper-2: #e7e6dc;
  --night: #171914; --night-2: #20231c; --acid: #d9ff62; --orange: #ef6b3b;
  --line: rgba(22,24,17,.16); --radius: 18px; --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --sans: "Aptos", "Helvetica Neue", Arial, sans-serif; --serif: Iowan Old Style, Baskerville, Georgia, serif;
}
* { box-sizing: border-box; }
html { background: var(--paper); color: var(--ink); }
body { margin: 0; min-width: 320px; overflow-x: hidden; font-family: var(--sans); background: var(--paper); }
button, input, select { font: inherit; }
button, select { min-height: 44px; }
.topbar { height: 72px; display: flex; align-items: center; justify-content: space-between; padding: 0 clamp(20px, 5vw, 72px); border-bottom: 1px solid var(--line); }
.brand { color: inherit; text-decoration: none; display: flex; align-items: center; gap: 10px; font-weight: 700; letter-spacing: -.02em; }
.brand-mark { width: 30px; height: 30px; display: grid; place-items: center; border-radius: 50%; color: var(--acid); background: var(--night); font-size: 18px; }
.privacy { color: var(--muted); font-size: 12px; letter-spacing: .02em; display: flex; align-items: center; gap: 8px; }
.privacy span { width: 7px; height: 7px; background: #63a64b; border-radius: 50%; box-shadow: 0 0 0 3px rgba(99,166,75,.12); }
main { padding: 0 clamp(16px, 5vw, 72px); max-width: 1540px; margin: auto; }
.intro { display: grid; grid-template-columns: minmax(260px, 1fr) minmax(280px, .72fr); align-items: end; gap: 48px; padding: clamp(50px, 8vw, 105px) 0 clamp(44px, 6vw, 78px); position: relative; }
.eyebrow { position: absolute; top: 34px; margin: 0; text-transform: uppercase; font: 700 11px/1 var(--mono); letter-spacing: .14em; color: var(--orange); }
h1 { margin: 0; font-size: clamp(54px, 7.2vw, 112px); line-height: .82; letter-spacing: -.065em; font-weight: 800; max-width: 850px; }
h1 em { font-family: var(--serif); font-weight: 400; letter-spacing: -.06em; }
.lede { max-width: 560px; margin: 0 0 4px; font-size: clamp(17px, 1.55vw, 23px); line-height: 1.5; color: #55594e; text-wrap: pretty; }
.workbench { display: grid; grid-template-columns: minmax(0, 1.23fr) minmax(360px, .77fr); border-radius: var(--radius); overflow: hidden; box-shadow: 0 24px 64px rgba(41,39,28,.12); }
.composer { background: var(--night); color: #f6f5ed; padding: clamp(24px, 3vw, 48px); }
.interpretation { background: var(--paper-2); padding: clamp(24px, 3vw, 48px); display: flex; flex-direction: column; }
.section-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 28px; }
.section-head > div { display: flex; align-items: center; gap: 11px; }
.step { font: 600 10px/1 var(--mono); color: #83877a; border: 1px solid #43463d; border-radius: 99px; padding: 6px 7px; }
.section-head h2 { margin: 0; font-size: 15px; letter-spacing: -.01em; }
.syntax { font: 10px/1 var(--mono); color: #71766a; letter-spacing: .04em; }
.expression-wrap { height: 86px; display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 14px; border: 1px solid #484c40; background: #11130f; padding: 0 20px; border-radius: 10px; transition: border-color .15s, box-shadow .15s; }
.expression-wrap:focus-within { border-color: var(--acid); box-shadow: 0 0 0 3px rgba(217,255,98,.1); }
.prompt { color: var(--acid); font: 21px/1 var(--mono); }
#expression { width: 100%; min-width: 0; border: 0; outline: 0; background: transparent; color: #fff; font: clamp(17px, 2vw, 28px)/1 var(--mono); letter-spacing: .025em; text-transform: uppercase; }
.validity { color: var(--acid); text-transform: uppercase; font: 700 9px/1 var(--mono); letter-spacing: .12em; }
.validity::before { content: "✓"; display: inline-grid; place-items: center; width: 19px; height: 19px; margin-right: 7px; background: var(--acid); color: var(--ink); border-radius: 50%; }
.expression-wrap.invalid { border-color: #ff795f; }
.expression-wrap.invalid .validity { color: #ff795f; }
.expression-wrap.invalid .validity::before { content: "!"; background: #ff795f; }
.error { min-height: 18px; margin: 8px 0 4px; color: #ff9885; font: 11px/1.4 var(--mono); }
.field-grid { display: grid; grid-template-columns: repeat(5, 1fr); border: 1px solid #393c34; border-radius: 9px; overflow: hidden; margin: 20px 0 30px; }
.field { padding: 13px 12px 12px; min-width: 0; border-right: 1px solid #393c34; }
.field:last-child { border: 0; }
.field b { display: block; overflow: hidden; text-overflow: ellipsis; color: #f3f2e9; font: 600 14px/1.2 var(--mono); white-space: nowrap; }
.field span { display: block; margin-top: 7px; color: #707468; font-size: 9px; text-transform: uppercase; letter-spacing: .11em; }
.controls { display: grid; grid-template-columns: auto minmax(170px, 1fr) auto; align-items: center; gap: 14px; padding-top: 2px; }
.controls label { color: #8f9387; font-size: 12px; }
select { color: #f6f5ed; background: #272a22; border: 1px solid #464a3f; border-radius: 8px; padding: 0 36px 0 12px; outline: none; }
select:focus { border-color: var(--acid); }
.button { border: 0; border-radius: 8px; padding: 0 18px; background: var(--acid); color: #171914; font-weight: 700; cursor: pointer; }
.button:hover { filter: brightness(.93); }
.presets { display: flex; align-items: center; flex-wrap: wrap; gap: 7px; margin-top: 27px; }
.presets span { color: #6e7267; font: 10px/1 var(--mono); text-transform: uppercase; margin-right: 4px; }
.presets button { min-height: 34px; color: #b5b8ae; background: transparent; border: 1px solid #3e4138; border-radius: 99px; padding: 0 12px; font-size: 11px; cursor: pointer; }
.presets button:hover { border-color: #858b79; color: #fff; }
.light .step { border-color: #c5c4b9; color: #858579; }
.tz-badge { background: #d6d5ca; border-radius: 99px; padding: 7px 10px; max-width: 170px; overflow: hidden; text-overflow: ellipsis; font: 10px/1 var(--mono); white-space: nowrap; }
.plain-label { margin: 8px 0 10px; color: #76786e; text-transform: uppercase; font: 700 9px/1 var(--mono); letter-spacing: .13em; }
.description { margin: 0; min-height: 106px; font: clamp(29px, 3vw, 47px)/1.06 var(--serif); letter-spacing: -.035em; text-wrap: balance; }
.rail-wrap { margin: 32px 0 24px; }
.rail-label { display: flex; justify-content: space-between; color: #797b71; font: 9px/1 var(--mono); text-transform: uppercase; letter-spacing: .08em; }
.rail { position: relative; height: 30px; margin-top: 7px; border-top: 1px solid #b9b9ae; }
.rail-dot { position: absolute; top: -5px; width: 9px; height: 9px; background: var(--orange); border: 2px solid var(--paper-2); border-radius: 50%; transform: translateX(-50%); }
.rail-dot:first-child { background: var(--night); }
.runs { list-style: none; padding: 0; margin: 0; counter-reset: run; border-top: 1px solid #cac9bd; }
.runs li { counter-increment: run; display: grid; grid-template-columns: 28px 1fr auto; align-items: baseline; padding: 13px 0; border-bottom: 1px solid #cac9bd; gap: 8px; }
.runs li::before { content: counter(run, decimal-leading-zero); color: #919187; font: 9px/1 var(--mono); }
.run-date { font-size: 14px; font-weight: 650; }
.run-time { font: 14px/1 var(--mono); }
.run-relative { grid-column: 2; color: #85877d; font-size: 10px; text-align: left; margin-top: -4px; }
.dst-note { margin-top: auto; padding-top: 24px; display: grid; grid-template-columns: auto 1fr; gap: 12px; color: #6f7168; font-size: 10px; line-height: 1.4; }
.dst-note strong { color: var(--ink); font: 700 9px/1.4 var(--mono); text-transform: uppercase; }
footer { min-height: 90px; display: flex; justify-content: space-between; align-items: center; gap: 24px; color: #77796f; font-size: 10px; letter-spacing: .02em; }
button:focus-visible, select:focus-visible, a:focus-visible { outline: 2px solid var(--orange); outline-offset: 3px; }
@media (max-width: 980px) {
  .intro { grid-template-columns: 1fr; gap: 30px; }
  .workbench { grid-template-columns: 1fr; }
  .description { min-height: auto; margin-bottom: 12px; }
  .dst-note { margin-top: 24px; }
}
@media (max-width: 620px) {
  .topbar { height: 62px; padding: 0 16px; }
  .privacy { font-size: 0; }
  main { padding: 0 12px; }
  .intro { padding: 64px 4px 38px; }
  .eyebrow { top: 27px; }
  h1 { font-size: clamp(46px, 13vw, 58px); }
  .lede { font-size: 16px; }
  .workbench, .composer, .interpretation { min-width: 0; width: 100%; }
  .composer, .interpretation { padding: 22px 16px; }
  .syntax { display: none; }
  .expression-wrap { height: 72px; padding: 0 12px; gap: 8px; }
  #expression { font-size: 16px; }
  .validity { font-size: 0; }
  .validity::before { margin: 0; }
  .field-grid { grid-template-columns: repeat(5, minmax(0, 1fr)); }
  .field { padding: 11px 5px; text-align: center; }
  .field b { font-size: 11px; }
  .field span { font-size: 7px; }
  .controls { grid-template-columns: minmax(0, 1fr); gap: 7px; }
  .controls select { min-width: 0; width: 100%; max-width: 100%; }
  .controls label { margin-top: 4px; }
  .button { width: 100%; }
  .description { font-size: 32px; }
  footer { align-items: flex-start; flex-direction: column; justify-content: center; gap: 6px; padding: 22px 4px; }
}
@media (prefers-reduced-motion: reduce) { * { scroll-behavior: auto !important; transition: none !important; } }