/* 01 / Foundations: local fonts, visible focus, and a layout that survives zoom. */
:root { color-scheme: dark; --bg: #0b1019; --panel: #121d2c; --line: #304258; --text: #e9f0f8; --muted: #abbcce; --accent: #6ce8c3; --high: #ffb17f; --medium: #9ec4ff; --low: #bbc5d0; }
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 1rem; }
body { margin: 0; background: var(--bg); color: var(--text); font: 1rem/1.7 system-ui, -apple-system, "Segoe UI", sans-serif; }
a { color: var(--accent); text-underline-offset: .22em; }
a:hover { color: white; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 4px; }
.wrap { width: min(1180px, calc(100% - 3rem)); margin-inline: auto; }
h1, h2, h3, p { margin-top: 0; }
h1, h2, h3 { line-height: 1.15; letter-spacing: -.035em; }
h1 { font-size: clamp(4.5rem, 10vw, 8rem); margin-bottom: 1.5rem; font-weight: 700; }
h1 em { color: var(--accent); font-style: normal; }
h2 { font-size: clamp(2rem, 4vw, 3.2rem); max-width: 900px; margin-bottom: 2rem; }
h3 { font-size: 1.25rem; margin-bottom: 1rem; }
h3 small { font-size: .75rem; color: var(--muted); font-weight: 400; letter-spacing: 0; }
p { max-width: 85ch; }
li + li { margin-top: .5rem; }
code, pre { font-family: Consolas, "Cascadia Code", monospace; font-size: .92em; }
code { color: #c8e3ff; overflow-wrap: anywhere; }
pre { white-space: pre-wrap; overflow-wrap: anywhere; padding: 1rem; border: 1px solid var(--line); border-radius: .5rem; background: #080e17; }
small, .muted { color: var(--muted); }
.eyebrow, .tag { color: var(--accent); text-transform: uppercase; font-size: .73rem; font-weight: 700; letter-spacing: .14em; }
.skip { position: absolute; left: 1rem; top: -10rem; z-index: 10; background: var(--panel); padding: 1rem; }
.skip:focus { top: 1rem; }

/* 02 / Article and architecture. */
.header, .header nav, .footer, .actions { display: flex; flex-wrap: wrap; align-items: center; gap: 1.4rem; }
.header { padding-block: 1.6rem; border-bottom: 1px solid var(--line); justify-content: space-between; }
.header nav { font-size: .87rem; }
.brand { color: var(--text); font-size: .9rem; font-weight: 700; text-decoration: none; letter-spacing: .04em; }
.brand span { color: var(--accent); font: bold 1.4rem Consolas, monospace; padding-right: .6rem; }
.brand small { font-size: .65rem; }
.hero { display: grid; grid-template-columns: 1.2fr 1fr; gap: 5rem; padding-block: 5rem; align-items: center; }
.intro { font-size: 1.4rem; max-width: 36ch; }
.panel { background: var(--panel); padding: 1.5rem; border: 1px solid var(--line); border-radius: .8rem; }
.blueprint { background: linear-gradient(145deg, #17293a, var(--panel)); padding: 2rem; }
.flow-box { border: 1px solid #5c778e; background: #0d1826; padding: 1rem; text-align: center; letter-spacing: .06em; }
.flow-box small { display: block; letter-spacing: 0; font-size: .8rem; }
.arrow { text-align: center; color: var(--muted); padding-block: .7rem; font-size: .8rem; }
.queue-mini { display: grid; gap: .4rem; }
.queue-mini span { border-left: 3px solid var(--high); background: #0d1826; padding: .6rem 1rem; font: .8rem Consolas, monospace; }
.queue-mini span:nth-child(2) { border-color: var(--medium); }
.queue-mini span:nth-child(3) { border-color: var(--low); }
.blueprint > p:last-child { font-size: .85rem; margin: 1.3rem 0 0; }
.contents { display: flex; flex-wrap: wrap; gap: .7rem 1.5rem; padding-block: 1.5rem; border-block: 1px solid var(--line); font-size: .8rem; }
.section { padding-block: 4.5rem; border-bottom: 1px solid var(--line); }
.columns { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 2rem; }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 1rem; margin-bottom: 1.5rem; }
.cards p { font-size: .9rem; margin-bottom: 0; }
.cards h3 { margin-top: .7rem; }
.callout { border-left: 3px solid var(--accent); background: #14232e; padding: 1rem 1.4rem; max-width: none; }
.steps { display: grid; grid-template-columns: repeat(4, 1fr); list-style: none; padding: 0; gap: 1rem; counter-reset: step; margin-block: 2rem; }
.steps li { padding: 1.3rem; border-top: 2px solid var(--accent); background: var(--panel); margin: 0; }
.steps li::before { counter-increment: step; content: "0" counter(step); display: block; font-size: .75rem; color: var(--accent); margin-bottom: .5rem; }
.steps span, .steps strong { display: block; }
.steps span { font-size: .9rem; color: var(--muted); }
.footer { justify-content: space-between; padding-block: 2rem; font-size: .8rem; }

/* 03 / Keyboard-friendly controls and scheduler model. */
button, input, select, .button { font: inherit; font-size: .85rem; border-radius: .35rem; }
button, .button { border: 1px solid #57738d; background: #203349; color: var(--text); padding: .65rem 1rem; cursor: pointer; text-decoration: none; display: inline-block; }
button:hover:not(:disabled), .button:hover { background: #2b455f; }
button:disabled { opacity: .45; cursor: not-allowed; }
.primary { color: #09191b; background: var(--accent); border-color: var(--accent); font-weight: 700; }
.primary:hover { color: #09191b; background: #aeffe6; }
input, select { color: var(--text); background: #0b1521; border: 1px solid #57738d; padding: .6rem; min-height: 2.7rem; max-width: 100%; }
input[type="number"] { width: 7rem; }
.controls { display: flex; flex-wrap: wrap; align-items: end; gap: 1rem; margin-bottom: 1.5rem; }
.controls label { font-size: .78rem; display: grid; gap: .4rem; color: var(--muted); }
.transport { border-block: 1px solid var(--line); padding-block: 1rem; align-items: center; }
#model-status { color: var(--accent); font-size: .85rem; }
.stats { display: flex; flex-wrap: wrap; gap: 1rem 2rem; padding-bottom: 1.2rem; }
.stats div { min-width: 70px; }
.stats dt { color: var(--muted); font-size: .75rem; }
.stats dd { margin: 0; font-size: 1.8rem; line-height: 1.3; font-variant-numeric: tabular-nums; }
.scheduler { display: grid; grid-template-columns: 1.2fr 1fr; gap: 2rem; }
.lane { border: 1px solid var(--line); border-left: 3px solid var(--low); border-radius: .3rem; margin-bottom: .7rem; padding: .7rem; }
.lane[data-priority="0"] { border-left-color: var(--high); }
.lane[data-priority="1"] { border-left-color: var(--medium); }
.lane h4 { margin: 0 0 .4rem; font-size: .8rem; }
.tokens { display: flex; flex-wrap: wrap; gap: .35rem; min-height: 2rem; }
.token { font: .75rem/1.8 Consolas, monospace; background: #263952; border: 1px solid #49627b; border-radius: .2rem; padding: .1rem .4rem; }
#worker-cards { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .7rem; }
.worker { padding: .8rem; border: 1px solid var(--line); border-radius: .4rem; background: #0c1623; font-size: .8rem; }
.worker strong, .worker span { display: block; }
.worker.busy { border-color: var(--accent); }
.worker meter { width: 100%; height: .6rem; display: block; margin-top: .6rem; }
details { margin-block: 1.5rem; }
summary { cursor: pointer; color: var(--accent); }
#model-events { font: .8rem/1.8 Consolas, monospace; max-height: 14rem; overflow: auto; }
.simulator > p:last-child { margin-bottom: 0; font-size: .85rem; }

/* 04 / Real measurements are visually and semantically separate. */
.table-scroll { overflow-x: auto; margin-block: 1.5rem 2.5rem; border: 1px solid var(--line); border-radius: .5rem; }
table { border-collapse: collapse; width: 100%; text-align: left; font-size: .85rem; font-variant-numeric: tabular-nums; }
caption { text-align: left; color: var(--muted); padding: 1rem; font-size: .8rem; background: var(--panel); }
th, td { padding: .85rem 1rem; border-bottom: 1px solid var(--line); }
th { color: var(--accent); font-weight: 600; background: #111c2a; white-space: nowrap; }
tbody tr:last-child td { border-bottom: none; }
tbody tr:nth-child(even) { background: #101a28; }
#environment { margin-bottom: 2rem; font-size: .85rem; }
#environment dl { display: grid; grid-template-columns: 9rem 1fr; gap: .4rem 1rem; margin: 0; }
#environment dt { color: var(--muted); }
#environment dd { margin: 0; overflow-wrap: anywhere; }
@media (max-width: 850px) { .hero { gap: 2rem; } .steps { grid-template-columns: repeat(2, 1fr); } .columns { gap: 1.3rem; } .scheduler { grid-template-columns: 1fr; } }
@media (max-width: 640px) { .wrap { width: calc(100% - 2rem); } .hero, .columns { grid-template-columns: 1fr; } .hero { padding-block: 3rem; } .section { padding-block: 3rem; } .header nav { gap: 1rem; } .steps { grid-template-columns: 1fr; } .panel { padding: 1rem; } .controls button { min-height: 2.8rem; } #environment dl { grid-template-columns: 1fr; } #environment dd { margin-bottom: .5rem; } }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
@media print { body { color: black; background: white; } .header nav, .controls, .simulator, .actions, .contents { display: none; } .panel, .callout, th, tbody tr:nth-child(even) { background: white; color: black; } h1 em, a, code, .eyebrow, th { color: #164a51; } .hero, .columns { display: block; } .table-scroll { overflow: visible; } .section { padding-block: 2rem; } }