@font-face { font-family: "Plex Mono CS"; src: url("fonts/IBMPlexMono-Regular.woff2") format("woff2"); font-weight: 400; font-display: swap; }
@font-face { font-family: "Plex Mono CS"; src: url("fonts/IBMPlexMono-SemiBold.woff2") format("woff2"); font-weight: 600; font-display: swap; }

:root {
  --ground: #0b1220; --panel: rgba(13,21,38,.72); --panel-solid: #101a30;
  --ink: #dfe6f2; --ink2: #9aa7bd; --ink3: #5c6a83; --line: #22314e;
  --amber: #e8a33d; --amber-dim: rgba(232,163,61,.14); --cyan: #5fa8bc; --red: #e0664f;
  --mono: "Plex Mono CS", "IBM Plex Mono", ui-monospace, Menlo, Consolas, monospace;
  --sans: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
}
* { box-sizing: border-box; }
html, body { margin: 0; }
html { overflow-x: hidden; }
body {
  background-color: var(--ground); color: var(--ink); font: 16px/1.6 var(--sans); -webkit-font-smoothing: antialiased;
  background-image:
    linear-gradient(rgba(95,168,188,.045) 1px, transparent 1px), linear-gradient(90deg, rgba(95,168,188,.045) 1px, transparent 1px),
    linear-gradient(rgba(95,168,188,.08) 1px, transparent 1px), linear-gradient(90deg, rgba(95,168,188,.08) 1px, transparent 1px);
  background-size: 28px 28px, 28px 28px, 140px 140px, 140px 140px;
  overflow-x: hidden;
}
::selection { background: var(--amber); color: var(--ground); }
a { color: var(--amber); }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 16px; }
.label { font: 500 11px/1 var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--amber); margin: 0 0 12px; }
.note { font: 12.5px/1.6 var(--mono); color: var(--ink3); margin: 0; }

.frame { position: relative; border: 1px solid var(--line); background: var(--panel); }
.frame::before, .frame::after { content: ""; position: absolute; width: 14px; height: 14px; border: 0 solid var(--cyan); pointer-events: none; z-index: 2; }
.frame::before { top: -1px; left: -1px; border-top-width: 1px; border-left-width: 1px; }
.frame::after { bottom: -1px; right: -1px; border-bottom-width: 1px; border-right-width: 1px; }

/* top bar */
.top { display: flex; justify-content: space-between; align-items: center; gap: 16px; padding-top: 22px; padding-bottom: 6px; flex-wrap: wrap; }
.brand { font: 500 14px var(--mono); color: var(--ink); text-decoration: none; letter-spacing: -.01em; }
.brand .at { color: var(--amber); font-weight: 600; }
.brand .sep, .brand .dim { color: var(--ink3); }
body[data-mode="landing"] .lookup.mini { display: none; }

/* lookup forms */
.lookup { display: flex; align-items: stretch; border: 1px solid var(--line); background: var(--panel-solid); font-family: var(--mono); max-width: 100%; }
.lookup:focus-within { border-color: color-mix(in srgb, var(--amber) 60%, var(--line)); }
.lookup .pre { display: flex; align-items: center; padding-left: 14px; color: var(--ink3); white-space: nowrap; }
.lookup input { flex: 1; min-width: 0; background: transparent; border: 0; outline: 0; color: var(--ink); font: inherit; padding: 0 4px 0 1px; }
.lookup button { background: var(--amber); color: var(--ground); border: 0; font: 600 15px var(--mono); padding: 0 18px; cursor: pointer; white-space: nowrap; }
.lookup button:hover { filter: brightness(1.08); }
.lookup.mini { font-size: 13.5px; height: 36px; width: 330px; }
.lookup.mini .pre { padding-left: 10px; }
.lookup.mini button { padding: 0 12px; }
.lookup.big { font-size: 17px; height: 56px; max-width: 560px; margin-top: 26px; }
.lookup.big button span { display: inline-block; transition: transform .15s; }
.lookup.big button:hover span { transform: translateX(3px); }

/* hero */
.hero { padding-top: 48px; padding-bottom: 8px; }
body:not([data-mode="landing"]) .hero, body:not([data-mode="landing"]) .landing-only { display: none; }
body[data-mode="landing"] .sheet-only { display: none !important; }
body[data-mode="loading"] .side, body[data-mode="loading"] .how { visibility: hidden; }
h1 { font: 500 clamp(34px, 6.4vw, 62px)/1.04 var(--mono); letter-spacing: -.04em; margin: 8px 0 18px; max-width: 18ch; }
.intro { font-size: clamp(16.5px, 2.1vw, 19px); color: var(--ink2); max-width: 60ch; margin: 0; }
.intro b { color: var(--ink); font-weight: 500; }
.examples { font: 13.5px var(--mono); color: var(--ink3); margin: 14px 0 0; }
.examples a { text-decoration: none; }
.examples a:hover { text-decoration: underline; }

/* stage: card + side */
.stage { display: grid; grid-template-columns: minmax(0, 660px) minmax(0, 1fr); gap: 36px; align-items: start; margin-top: 30px; }
body[data-mode="error"] .stage, body[data-mode="error"] .how { display: none; }
.caption { font: 12.5px var(--mono); color: var(--ink3); margin: 0 0 10px; }
.card { padding: 14px; background: rgba(8,14,26,.85); box-shadow: 0 30px 80px -40px rgba(0,0,0,.9); }
.sheet-box { container-type: inline-size; }
/* 60 columns x 0.6em = 36em: the card fills its box exactly at any width */
.sheet {
  margin: 0; font-family: var(--mono); font-size: 14px; font-size: calc(100cqi / 36); line-height: 1.3;
  white-space: pre; font-variant-ligatures: none; letter-spacing: 0; color: var(--ink); overflow: hidden; min-height: 4em;
}
.k-f { color: #2f5d6e; } .k-t { color: var(--cyan); } .k-a { color: var(--amber); } .k-b { color: #b98235; }
.k-i { color: var(--ink); } .k-d { color: var(--ink2); } .k-m { color: var(--ink3); } .k-o { color: #34466a; }
.k-c { color: var(--cyan); } .k-r { color: var(--red); } .k-v { color: #eef1f7; }

.side { display: flex; flex-direction: column; gap: 26px; min-width: 0; }
body[data-mode="landing"] .side { padding-top: 30px; }
.btn.play {
  display: flex; justify-content: space-between; align-items: center; gap: 14px; background: var(--amber); color: var(--ground); text-decoration: none;
  font: 600 18px/1.3 var(--mono); padding: 20px 22px; transition: transform .15s, box-shadow .15s; letter-spacing: -.01em;
}
.btn.play:hover { transform: translateY(-1px); box-shadow: 0 10px 34px -8px rgba(232,163,61,.55); }
.btn.play span { transition: transform .15s; font-size: 22px; }
.btn.play:hover span { transform: translateX(4px); }
#play-sub { margin-top: -16px; }
.notice { font: 13.5px/1.6 var(--mono); color: var(--ink2); border-left: 2px solid var(--amber); padding: 4px 0 4px 12px; margin: 0; }
.buttons { display: flex; flex-wrap: wrap; gap: 8px; }
.sbtn {
  font: 500 13.5px var(--mono); color: var(--ink); background: var(--panel-solid); border: 1px solid var(--line); padding: 9px 13px;
  text-decoration: none; cursor: pointer; transition: border-color .15s, color .15s;
}
.sbtn:hover { border-color: var(--amber); color: var(--amber); }
#why { margin: 0; font-size: 14.5px; }
#why dt { font: 600 13px var(--mono); color: var(--amber); margin-top: 12px; }
#why dt:first-child { margin-top: 0; }
#why dd { margin: 2px 0 0; color: var(--ink); }
#why .flav { display: block; color: var(--ink3); font-size: 13.5px; margin-top: 2px; }

/* how */
.how { margin-top: 56px; }
.how details { padding: 0; }
.how summary { cursor: pointer; padding: 18px 22px; font: 500 15px var(--mono); color: var(--ink); list-style: none; display: flex; justify-content: space-between; }
.how summary::-webkit-details-marker { display: none; }
.how summary::after { content: "+"; color: var(--amber); font-size: 18px; line-height: 1; }
.how details[open] summary::after { content: "−"; }
.how-body { padding: 0 22px 24px; color: var(--ink2); font-size: 14.5px; }
.how-body > p:first-child { margin-top: 0; max-width: 80ch; }
.how h3 { font: 600 12px var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--amber); margin: 22px 0 8px; }
.how .cols { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 28px; }
.how ol, .how ul { padding-left: 20px; margin: 0; }
.how li { margin: 4px 0; }
.how li b { color: var(--ink); font-weight: 500; }
.how b { color: var(--ink); font-weight: 500; }
.numbers { display: grid; grid-template-columns: repeat(auto-fill, minmax(210px, 1fr)); gap: 4px 24px; font: 13.5px var(--mono); }
.numbers div { display: flex; justify-content: space-between; border-bottom: 1px dashed var(--line); padding: 4px 0; }
.numbers b { color: var(--ink); font-weight: 500; }
.numbers .note { grid-column: 1 / -1; margin-top: 10px; }

.error { margin-top: 36px; padding: 22px 24px; font-size: 16px; color: var(--ink2); max-width: 720px; }
.error b { color: var(--ink); display: block; font: 500 17px var(--mono); margin-bottom: 6px; }

footer.wrap { margin-top: 72px; padding-bottom: 48px; }
.foot { border-top: 1px solid var(--line); padding-top: 24px; color: var(--ink2); font-size: 14.5px; }
.foot p { margin: 0 0 8px; }
.toast { position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%); background: var(--panel-solid); border: 1px solid var(--amber); color: var(--ink); font: 13.5px var(--mono); padding: 10px 16px; z-index: 10; }

@media (max-width: 960px) {
  .stage { grid-template-columns: minmax(0, 1fr); }
  .card-col { max-width: 660px; }
  .how .cols { grid-template-columns: minmax(0, 1fr); gap: 0; }
}
@media (max-width: 560px) {
  .top { flex-direction: column; align-items: stretch; }
  .lookup.mini { width: 100%; }
  .hero { padding-top: 28px; }
  .lookup.big { font-size: 15px; height: 50px; }
  .lookup.big .pre { display: none; }
  .lookup.big input { padding-left: 14px; }
  .card { padding: 8px; }
  .btn.play { font-size: 16px; padding: 16px 18px; }
  .how summary { padding: 16px; }
  .how-body { padding: 0 16px 20px; }
}