/* DevOps Nimbus GitHub Actions site.
   Calm, product-page styling: system font, solid surfaces, hairline borders, one accent. */
:root {
  --bg: #fbfbfd;
  --surface: #ffffff;
  --surface-2: #f5f5f7;
  --text: #1d1d1f;
  --muted: #6e6e73;
  --line: #d2d2d7;
  --hair: rgba(0, 0, 0, .08);
  --a: #e00080; --accent-fill: #ff7ac6; --accent-fill-hover: #e06bae; --on-fill: #1d1d1f;
  --accent-hover: #be006d;
  --accent-2: #e00080;
  --stage-accent: #ff7ac6; /* the dark stage keeps the dark-mode accent */
  --accent-soft: #ffeff8;
  --on-accent: #ffffff;
  --ok: #1d8a3a;
  --ok-soft: #e9f6ec;
  --bad: #d70015;
  --bad-soft: #fdecee;
  --warn: #c77700;
  --warn-text: #8a5300;
  --warn-soft: #fff4e0;
  --code-bg: #f0f0f3;
  --stage: #0b0b0d;
  --stage-text: #f5f5f7;
  --stage-muted: #8e8e93;
  --stage-line: rgba(255, 255, 255, .09);
  --shadow: 0 2px 8px rgba(0, 0, 0, .04), 0 12px 32px rgba(0, 0, 0, .06);
  --radius: 18px;
  --radius-sm: 12px;
  --ease: cubic-bezier(.22, .8, .2, 1);
  --mono: "SF Mono", ui-monospace, Menlo, Consolas, monospace;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --surface: #1c1c1e;
    --surface-2: #161617;
    --text: #f5f5f7;
    --muted: #a1a1a6;
    --line: #424245;
    --hair: rgba(255, 255, 255, .1);
    --a: #ff7ac6; --accent-fill: #ff7ac6; --accent-fill-hover: #ff8ecf; --on-fill: #000000;
    --accent-hover: #ff95d1;
    --accent-2: #ff7ac6;
    --accent-soft: #402837;
    --on-accent: #000000;
    --ok: #30d158;
    --ok-soft: #0f2e18;
    --bad: #ff6961;
    --bad-soft: #3a1414;
    --warn: #ffb340;
    --warn-text: #ffcc80;
    --warn-soft: #3a2a0c;
    --code-bg: #2c2c2e;
    --shadow: none;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: 72px; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 17px/1.47 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", "Segoe UI", system-ui, sans-serif;
  letter-spacing: -.016em; -webkit-font-smoothing: antialiased;
}
a { color: var(--a); text-decoration: none; }
a:hover { text-decoration: underline; }
code, pre { font-family: var(--mono); font-size: .86em; letter-spacing: 0; }
:not(pre) > code { background: var(--code-bg); padding: .12em .4em; border-radius: 6px; }
pre { background: var(--code-bg); padding: 14px 16px; border-radius: var(--radius-sm); overflow-x: auto; margin: 0; line-height: 1.6; }
h1, h2, h3, h4 { letter-spacing: -.03em; line-height: 1.1; }
:focus-visible { outline: 3px solid var(--a); outline-offset: 3px; border-radius: 8px; }
button { font: inherit; }
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 24px; }
.skip { position: absolute; left: -9999px; }
.skip:focus { left: 16px; top: 8px; background: var(--surface); padding: 6px 10px; z-index: 30; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
.muted { color: var(--muted); }
.small { font-size: .9rem; }
.note { color: var(--muted); font-size: .88rem; }
.lede { color: var(--muted); font-size: 1.15rem; margin: -6px 0 24px; max-width: 700px; }
.tag { margin: 0 0 6px; font-size: .78rem; color: var(--muted); font-weight: 500; }
.dim { color: var(--stage-muted); }

/* Navigation: solid, quiet. */
.top { position: sticky; top: 0; z-index: 20; background: var(--bg); border-bottom: 1px solid var(--hair); }
.top-inner { display: flex; align-items: center; gap: 18px; height: 52px; }
.brand { display: flex; align-items: center; gap: 8px; font-weight: 600; font-size: .95rem; color: var(--text); white-space: nowrap; }
.brand:hover { text-decoration: none; }
.brand img { display: block; width: 22px; height: 22px; }
/* The problems page keeps a plain link row in its header. */
.problems .top nav { display: flex; align-items: center; gap: 2px; overflow-x: auto; flex: 1; scrollbar-width: none; }
.problems .top nav a { color: var(--text); opacity: .78; padding: 6px 10px; border-radius: 99px; white-space: nowrap; font-size: .82rem; transition: opacity .2s, background .2s; }
.problems .top nav a:hover { opacity: 1; text-decoration: none; }
.kbd-btn { display: inline-flex; align-items: center; gap: 10px; font-size: .8rem; color: var(--muted); background: var(--code-bg); border: 1px solid transparent; border-radius: 99px; padding: 5px 6px 5px 14px; cursor: pointer; }
.kbd-btn:hover { border-color: var(--line); }
kbd { font: 500 .72rem/1 var(--mono); color: var(--muted); background: var(--surface); border: 1px solid var(--line); border-radius: 6px; padding: 3px 6px; }

main { padding-bottom: 64px; min-height: 70vh; }
.tab > h2 { font-size: clamp(2rem, 4.5vw, 3rem); font-weight: 700; margin: 48px 0 14px; }

/* Hero: centred, on the plain page. */
.hero { text-align: center; padding: 88px 0 24px; }
.eyebrow { color: var(--a); font-weight: 600; font-size: 1.1rem; margin: 0 0 6px; }
.hero h1 { font-size: clamp(2.75rem, 7vw, 5rem); line-height: 1.04; letter-spacing: -.045em; font-weight: 700; margin: 0 0 18px; }
.hero .sub { font-size: clamp(1.15rem, 2.2vw, 1.5rem); color: var(--muted); line-height: 1.35; max-width: 660px; margin: 0 auto 30px; }
.ctas { display: flex; gap: 18px; justify-content: center; align-items: center; flex-wrap: wrap; }
.link { font-size: 1.05rem; }
.link::after { content: " ›"; }
.doors { display: grid; grid-template-columns: 1.2fr 1fr; gap: 16px; max-width: 980px; margin: 8px auto 0; text-align: left; }
.door { padding: 24px 26px; border-radius: 22px; border: 1px solid var(--hair); background: var(--surface); display: flex; flex-direction: column; gap: 6px; }
.door h2 { margin: 0; font-size: 1.35rem; letter-spacing: -.02em; }
.door p { margin: 0; color: var(--muted); }
.door .door-k { font-size: .85rem; font-weight: 600; color: var(--a); }
.door .ctas { justify-content: flex-start; margin-top: 10px; }
.door-search { display: flex; gap: 8px; margin-top: 10px; }
.door-search input { flex: 1; min-width: 0; border-radius: 99px; }
/* Fix mode banner: a neutral card with an on-call bar. */
.mode-banner { margin: 32px 0 0; padding: 12px 16px; border-radius: var(--radius-sm); background: var(--surface); border: 1px solid var(--hair); box-shadow: inset 3px 0 0 var(--oncall); font-size: .95rem; }
.mode-banner + h2 { margin-top: 28px; }
.pill {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px; min-height: 44px; padding: 0 22px; border-radius: 99px;
  font-size: 1rem; color: var(--a); background: transparent; border: 1px solid var(--a); cursor: pointer;
  transition: background .2s var(--ease), color .2s var(--ease), transform .2s var(--ease);
}
.pill:hover { text-decoration: none; background: var(--accent-soft); }
.pill:active { transform: scale(.98); }
.pill.primary { background: var(--accent-fill); color: var(--on-fill); border-color: var(--accent-fill); }
.pill.primary:hover { background: var(--accent-fill-hover); border-color: var(--accent-fill); }
.small-pill { min-height: 36px; padding: 0 18px; font-size: .9rem; }

/* The stage: the pipeline signature, dark and lit by the accent. */
.stage { position: relative; text-align: left; margin: 56px auto 0; max-width: 960px; background: var(--stage); color: var(--stage-text); border-radius: 30px; padding: 30px; overflow: hidden; isolation: isolate;
  box-shadow: 0 30px 80px -30px color-mix(in srgb, var(--a) 45%, transparent); }
.stage::before { content: ""; position: absolute; inset: -40% -10% auto; height: 120%; background: radial-gradient(closest-side, color-mix(in srgb, var(--stage-accent) 28%, transparent), transparent 70%); z-index: -1; pointer-events: none; }
.stage-bar { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; margin-bottom: 20px; font-size: 13px; color: var(--stage-muted); }
.stage-bar strong { color: var(--stage-text); font-weight: 600; font-size: 15px; }
.stage-controls { display: flex; gap: 8px; flex-wrap: wrap; }
.toggle { border: 1px solid var(--stage-line); background: rgba(255, 255, 255, .06); color: var(--stage-text); border-radius: 99px; padding: 7px 14px; font-size: 13px; cursor: pointer; transition: background .2s, border-color .2s; }
.toggle:hover, .toggle[aria-pressed="true"] { border-color: var(--stage-accent); background: color-mix(in srgb, var(--stage-accent) 18%, transparent); }
.toggle:disabled { opacity: .6; cursor: default; }
.pipe { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; }
.job-card { border: 1px solid var(--stage-line); border-radius: 14px; padding: 14px; transition: border-color .3s; }
.job-card b { display: block; font-size: 14px; }
.job-card .t { font-size: 12px; color: var(--stage-muted); }
.job-card.run { border-color: var(--stage-accent); }
.job-card.done { border-color: color-mix(in srgb, #30d158 60%, transparent); }
.jbar { height: 4px; border-radius: 99px; background: rgba(255, 255, 255, .08); margin-top: 10px; overflow: hidden; }
.jbar i { display: block; height: 100%; width: 0; background: var(--stage-accent); }
.job-card.done .jbar i { background: #30d158; }
.meter { margin-top: 16px; display: flex; justify-content: space-between; font-size: 15px; font-family: var(--mono); }

/* Stats and bento */
.stats { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 1px; background: var(--hair); border-radius: 22px; overflow: hidden; margin: 56px auto 0; max-width: 960px; text-align: left; }
.stats div { background: var(--surface); padding: 24px; }
.stats b { display: block; font-size: 40px; letter-spacing: -.04em; line-height: 1.1; }
.stats span { color: var(--muted); font-size: 15px; }
.section { padding: 72px 0 8px; }
.section-title { font-size: clamp(1.7rem, 3.5vw, 2.4rem); font-weight: 700; margin: 72px 0 8px; }
.section-title.big { font-size: clamp(2rem, 4.5vw, 3rem); max-width: 760px; margin: 0 0 36px; }
.section-sub { color: var(--muted); font-size: 1.1rem; margin: 0 0 24px; }
.bento { display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 18px; }
.tile { background: var(--surface); border: 1px solid var(--hair); border-radius: 26px; padding: 28px; grid-column: span 2; min-height: 210px; display: flex; flex-direction: column; justify-content: space-between; color: var(--text);
  transition: transform .35s var(--ease), box-shadow .35s var(--ease); }
.tile:hover { text-decoration: none; transform: translateY(-3px); box-shadow: 0 18px 40px -22px rgba(0, 0, 0, .3); }
.tile.wide { grid-column: span 3; }
.tile .k { color: var(--a); font-weight: 600; font-size: 15px; }
.tile h3 { font-size: 26px; letter-spacing: -.03em; line-height: 1.12; margin: 8px 0 0; }
.tile p { color: var(--muted); margin: 10px 0 0; font-size: 15px; }

/* Cards, forms, chips */
.card { background: var(--surface); border-radius: var(--radius); box-shadow: var(--shadow); border: 1px solid var(--hair); padding: 24px 26px; }
.field { display: flex; flex-direction: column; gap: 6px; font-size: .9rem; color: var(--muted); max-width: 560px; margin-bottom: 22px; }
.wide-field { max-width: 760px; }
select, input[type="search"], input[type="text"] { font: inherit; color: var(--text); background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-sm); padding: 11px 14px; }
select:focus, input[type="search"]:focus, input[type="text"]:focus { border-color: var(--a); outline: none; box-shadow: 0 0 0 4px var(--accent-soft); }
.chip { font-size: .86rem; border: 1px solid var(--line); background: var(--surface); color: var(--text); padding: 7px 14px; border-radius: 99px; cursor: pointer; display: inline-flex; align-items: center; transition: border-color .15s, background .15s; }
.chip:hover { border-color: var(--a); text-decoration: none; }
.chip[aria-pressed="true"] { border-color: var(--a); background: var(--accent-soft); color: var(--a); }
.linkish, .link-btn { color: var(--a); background: none; border: 0; padding: 0; cursor: pointer; }
.linkish:hover, .link-btn:hover { text-decoration: underline; }

/* Start */
.start-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 18px; margin-top: 20px; }
.start-grid h3 { font-size: 1.3rem; margin: 0 0 4px; }
.start-grid .muted { margin: 0 0 16px; }
pre.start { line-height: 1.7; }
pre.start .cm { color: var(--muted); }
.start-list { margin: 0; padding-left: 20px; line-height: 1.8; }

/* Path */
.progress-row { display: flex; align-items: center; gap: 14px; margin: 16px 0 8px; }
.bar { flex: 1; height: 6px; background: var(--line); border-radius: 99px; overflow: hidden; }
.bar span { display: block; height: 100%; width: 0; background: var(--accent-fill); border-radius: 99px; transition: width .5s var(--ease); }
#bar-text { color: var(--muted); font-size: .85rem; white-space: nowrap; }
.stage-title { font-size: 1.25rem; font-weight: 700; margin: 36px 0 12px; }
.levels { list-style: none; padding: 0; margin: 0; background: var(--surface); border-radius: var(--radius); box-shadow: var(--shadow); border: 1px solid var(--hair); overflow: hidden; }
.level { display: grid; grid-template-columns: auto auto minmax(0, 1fr) auto; align-items: start; gap: 16px; padding: 16px 20px; border-top: 1px solid var(--hair); }
.level:first-child { border-top: 0; }
.level input { width: 20px; height: 20px; accent-color: var(--ok); margin-top: 3px; }
.level .num { font: .82rem/1.9 var(--mono); color: var(--muted); }
.level .what summary { cursor: pointer; display: flex; flex-direction: column; list-style: none; }
.level .what summary::-webkit-details-marker { display: none; }
.level.done .what strong { color: var(--muted); }
.level .topic { color: var(--muted); font-size: .88rem; }
.level-body { padding-top: 8px; font-size: .95rem; }
.level-body h4 { font-size: .82rem; color: var(--muted); margin: 12px 0 4px; letter-spacing: 0; }
.level-body ul, .level-body ol { margin: 0; padding-left: 20px; }
.level-body li { margin: 3px 0; }
.level .actions { display: flex; gap: 14px; align-items: center; }

/* Quiz */
.score { position: sticky; top: 60px; z-index: 5; background: var(--surface); box-shadow: var(--shadow); border: 1px solid var(--hair); border-radius: var(--radius); padding: 14px 20px; margin-bottom: 18px; display: grid; gap: 10px; font-variant-numeric: tabular-nums; }
.score .meter { display: block; height: 6px; background: var(--line); border-radius: 99px; overflow: hidden; margin: 0; }
.score .fill { display: block; height: 100%; width: 0; background: var(--accent-fill); transition: width .35s var(--ease); }
.score .result { margin: 0; }
.question { margin-bottom: 16px; }
.question h3 { font-size: 1.12rem; margin: 0 0 16px; font-weight: 600; line-height: 1.35; letter-spacing: -.02em; }
.options { display: grid; gap: 10px; }
.opt { font-size: 1rem; text-align: left; color: var(--text); background: var(--surface-2); border: 1px solid var(--line); border-radius: var(--radius-sm); padding: 13px 16px; cursor: pointer; transition: border-color .2s, background .2s; }
.opt:hover:not(:disabled) { border-color: var(--a); background: var(--surface); }
.opt:disabled { cursor: default; }
.opt.right { border-color: var(--ok); background: var(--ok-soft); }
.opt.right::before { content: "✓  "; color: var(--ok); font-weight: 700; }
.opt.wrong { border-color: var(--bad); background: var(--bad-soft); }
.opt.wrong::before { content: "✕  "; color: var(--bad); font-weight: 700; }
.opt:disabled:not(.right):not(.wrong) { opacity: .55; }
.feedback { margin: 14px 0 0; line-height: 1.5; }
.feedback:empty { display: none; }
.feedback.ok strong { color: var(--ok); }
.feedback.bad strong { color: var(--bad); }
.quiz-again { margin: -8px 0 20px; }

/* X-ray */
.seg { display: inline-flex; background: var(--code-bg); border-radius: 18px; padding: 3px; margin-bottom: 18px; flex-wrap: wrap; max-width: 100%; }
.seg button { font-size: .86rem; border: 0; background: transparent; color: var(--muted); padding: 7px 14px; border-radius: 99px; cursor: pointer; }
.seg button[aria-selected="true"] { background: var(--surface); color: var(--text); box-shadow: 0 1px 4px rgba(0, 0, 0, .12); }
.xray { display: grid; grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr); gap: 18px; align-items: start; }
.xray[hidden] { display: none; }
.code { list-style: none; margin: 0; padding: 10px 0; background: var(--surface); border: 1px solid var(--hair); box-shadow: var(--shadow); border-radius: var(--radius); overflow-x: auto; counter-reset: ln; }
.code li { counter-increment: ln; display: flex; }
.code li::before { content: counter(ln); width: 38px; flex: none; text-align: right; padding-right: 12px; color: var(--muted); font: .78rem/2.1 var(--mono); opacity: .6; }
.line { flex: 1; text-align: left; border: 0; background: transparent; color: var(--text); font: .85rem/2.1 var(--mono); white-space: pre; padding: 0 14px 0 4px; cursor: pointer; border-radius: 6px; }
.line:hover, .line.on { background: var(--accent-soft); }
.line.on { box-shadow: inset 3px 0 0 var(--a); }
.line.blank { cursor: default; }
.line.blank:hover { background: none; }
.line.warn { box-shadow: inset 3px 0 0 var(--warn); }
.line.unknown { color: var(--muted); }
#xray-note { position: sticky; top: 72px; }
#xray-note pre { margin-bottom: 14px; white-space: pre-wrap; }
.xray-warn { color: var(--warn-text); background: var(--warn-soft); padding: 8px 12px; border-radius: 10px; font-size: .92rem; }
.xray-paste { margin-bottom: 18px; }
.xray-paste-label { display: block; font-weight: 600; margin-bottom: 8px; }
#xray-input { width: 100%; font: .86rem/1.6 var(--mono); color: var(--text); background: var(--code-bg); border: 1px solid transparent; border-radius: var(--radius-sm); padding: 12px 14px; resize: vertical; }
#xray-input:focus { outline: none; border-color: var(--a); }
.xray-paste-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 14px; margin-top: 12px; }
.xray-result-bar { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px 18px; }
.xray-result-title { margin: 0; font-weight: 600; }
.xray-result-bar .note { margin: 2px 0 0; }
#xray-review:not(:empty) { margin-top: 14px; padding-top: 12px; border-top: 1px solid var(--hair); }
.xray-missing summary { cursor: pointer; font-size: .9rem; font-weight: 600; color: var(--warn-text); }
.xray-review { margin: 6px 0 0; padding-left: 20px; font-size: .9rem; color: var(--muted); }
.code li.note-slot { display: block; counter-increment: none; padding: 6px 10px 10px; }
.code li.note-slot::before { content: none; }
.code li.note-slot #xray-note { position: static; box-shadow: none; }

/* Troubleshoot */
.doctor-groups { margin: 0 0 20px; padding: 4px 20px; background: var(--surface); border: 1px solid var(--hair); border-radius: var(--radius); box-shadow: var(--shadow); }
.doctor-group { display: grid; grid-template-columns: 210px minmax(0, 1fr); gap: 8px 16px; padding: 12px 0; }
.doctor-group[hidden] { display: none; }
.doctor-group:not([hidden]) ~ .doctor-group:not([hidden]) { border-top: 1px solid var(--hair); }
.doctor-group-name { display: flex; align-items: center; gap: 8px; min-height: 34px; font-size: .84rem; font-weight: 600; }
.doctor-group-count { font-size: .72rem; font-weight: 500; color: var(--muted); background: var(--code-bg); border-radius: 99px; padding: 2px 8px; font-variant-numeric: tabular-nums; }
.doctor-group-items { display: flex; flex-wrap: wrap; gap: 8px; }
.doctor-group .chip { font-size: .82rem; padding: 6px 12px; text-align: left; }
.doctor-group .chip[hidden] { display: none; }
#doctor-out { scroll-margin-top: 72px; }
.no-answer h3 { margin: 0 0 6px; font-size: 1.1rem; }
.no-answer p { margin: 0; color: var(--muted); }
.no-answer .doctor-practise { margin-top: 14px; }
.answer h3 { margin: 0; font-size: 1.3rem; }
.answer-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; }
.answer h4 { margin: 18px 0 6px; font-size: .82rem; color: var(--muted); font-weight: 600; letter-spacing: 0; }
.answer p { margin: 0; }
.answer pre { white-space: pre-wrap; word-break: break-word; }
.answer pre.err { background: var(--bad-soft); color: var(--text); }
/* Each cause of an error: why, a check that proves it, and its own fix. */
.causes { list-style: none; margin: 0; padding: 0; counter-reset: cause; display: grid; gap: 10px; }
.cause { counter-increment: cause; position: relative; padding: 14px 16px 14px 48px; border: 1px solid var(--hair); border-radius: var(--radius-sm); background: var(--surface); }
.cause::before { content: counter(cause); position: absolute; left: 14px; top: 14px; width: 22px; height: 22px; border-radius: 50%; background: var(--accent-soft); color: var(--a); font-size: .78rem; font-weight: 600; line-height: 22px; text-align: center; }
.answer .cause-why { margin: 0; }
.answer .cause-label { margin: 12px 0 4px; font-size: .76rem; font-weight: 600; color: var(--muted); }
.cause pre { margin: 0; }
@media (max-width: 480px) {
  .cause { padding: 12px 12px 12px 40px; }
  .cause::before { left: 10px; top: 12px; }
}
.doctor-practise { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-top: 16px; }
.learn-it { margin-top: 24px; padding: 18px 20px; border-radius: var(--radius-sm); background: var(--accent-soft); border: 1px solid var(--hair); }
.answer .learn-it h4 { margin-top: 0; color: var(--text); }
.learn-it > p { margin: 4px 0 0; }

/* Cheat sheet */
.group { font-size: 1rem; color: var(--muted); margin: 28px 0 10px; font-weight: 600; }
.cheats { list-style: none; padding: 0; margin: 0; background: var(--surface); border: 1px solid var(--hair); box-shadow: var(--shadow); border-radius: var(--radius); overflow: hidden; }
.cheats li { display: flex; align-items: center; justify-content: space-between; gap: 14px; padding: 12px 18px; border-top: 1px solid var(--hair); }
.cheats li:first-child { border-top: 0; }
.cheats li > div:first-child { display: flex; flex-direction: column; gap: 4px; min-width: 0; }
.cheats code { background: none; padding: 0; overflow-wrap: anywhere; }
.cheats pre.snippet { padding: 8px 12px; font-size: .9em; }
.cheats .muted { font-size: .86rem; }
.copy { font-size: .8rem; border: 1px solid var(--line); background: var(--surface); color: var(--a); padding: 5px 12px; border-radius: 99px; cursor: pointer; }
.copy:hover { border-color: var(--a); text-decoration: none; }
.cheat-actions { display: flex; gap: 6px; flex: none; }
.cheat-actions > :first-child { min-width: 52px; text-align: center; }
.copy.lab { color: var(--muted); }

/* Guides */
.guide { margin: 0 0 20px; background: var(--surface); border: 1px solid var(--hair); border-radius: var(--radius); }
.guide summary { cursor: pointer; padding: 12px 18px; font-weight: 600; font-size: .92rem; color: var(--a); list-style: none; }
.guide summary::-webkit-details-marker { display: none; }
.guide summary::before { content: "› "; }
.guide[open] summary::before { content: "⌄ "; }
.guide-body { padding: 0 18px 16px; font-size: .95rem; }
.guide-cols { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr); gap: 8px 32px; }
.guide h3 { font-size: .82rem; color: var(--muted); font-weight: 600; margin: 4px 0 6px; letter-spacing: 0; }
.guide ol, .guide ul { margin: 0 0 12px; padding-left: 20px; }

/* Playground */
.playground { scroll-margin-top: 60px; }
.pg-scenarios { margin: 0 0 16px; padding: 4px 20px; background: var(--surface); border: 1px solid var(--hair); border-radius: var(--radius); box-shadow: var(--shadow); }
.pg-group { display: grid; grid-template-columns: 210px minmax(0, 1fr); gap: 8px 16px; padding: 12px 0; }
.pg-group + .pg-group { border-top: 1px solid var(--hair); }
.pg-group-name { display: flex; align-items: center; gap: 8px; min-height: 34px; font-size: .84rem; font-weight: 600; }
.pg-group-count { font-size: .72rem; font-weight: 500; color: var(--muted); background: var(--code-bg); border-radius: 99px; padding: 2px 8px; font-variant-numeric: tabular-nums; }
.pg-group-count.done { color: var(--ok); }
.pg-group-items { display: flex; flex-wrap: wrap; gap: 8px; }
.pg-scn { font-size: .82rem; display: inline-flex; align-items: center; gap: 6px; min-height: 34px; padding: 4px 14px; border-radius: 99px; text-align: left; border: 1px solid var(--line); background: var(--surface); color: var(--text); cursor: pointer; }
.pg-scn:hover { border-color: var(--a); }
.pg-scn[aria-pressed="true"] { background: var(--text); color: var(--bg); border-color: var(--text); }
.pg-scn-done { color: var(--ok); font-weight: 700; }
.pg-scn[aria-pressed="true"] .pg-scn-done { color: inherit; }
.pg-brief { margin-bottom: 16px; }
.pg-brief-top { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.pg-brief h3 { margin: 0; font-size: 1.35rem; }
.pg-brief-actions { display: flex; gap: 8px; flex-wrap: wrap; align-items: flex-start; }
.pg-story { margin: 12px 0; }
.pg-goal { display: inline-block; margin: 0 0 12px; font-size: .92rem; font-weight: 500; padding: 8px 14px; border-radius: 14px; background: var(--surface-2); border: 1px solid var(--hair); }
.pg-goal.done { background: var(--ok-soft); color: var(--ok); border-color: transparent; }
.pg-goal.done .linkish { color: var(--ok); text-decoration: underline; }
.pg-checks { list-style: none; margin: 0; padding: 0; display: grid; gap: 4px; font-size: .9rem; color: var(--muted); }
.pg-checks li { display: flex; gap: 8px; align-items: baseline; }
.pg-checks li.ok { color: var(--ok); }
.pg-check { width: 1em; flex: none; font-weight: 700; }
.pg-hints p { margin: 10px 0 0; font-size: .92rem; background: var(--surface-2); padding: 8px 12px; border-radius: 10px; }
.pg-body { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 16px; align-items: start; }
.pg-editor, .pg-run { min-width: 0; }
.pg-files { display: flex; gap: 4px; flex-wrap: wrap; margin-bottom: 8px; }
.pg-files button { font: .78rem var(--mono); border: 1px solid var(--line); background: var(--surface); color: var(--muted); padding: 5px 10px; border-radius: 8px; cursor: pointer; }
.pg-files button[aria-selected="true"] { color: var(--text); border-color: var(--a); }
.pg-code-wrap { display: flex; background: var(--surface); border: 1px solid var(--hair); border-radius: var(--radius-sm); box-shadow: var(--shadow); overflow: hidden; height: 460px; }
.pg-code-wrap:focus-within { border-color: var(--a); }
.pg-gutter { flex: none; width: 40px; overflow: hidden; padding: 12px 8px 12px 0; text-align: right; font: 13px/20px var(--mono); color: var(--muted); background: var(--surface-2); user-select: none; }
.pg-gutter span { display: block; }
.pg-gutter span.bad { color: var(--bad); font-weight: 700; }
#pg-code { flex: 1; min-width: 0; border: 0; resize: none; outline: none; padding: 12px 14px; font: 13px/20px var(--mono); color: var(--text); background: transparent; white-space: pre; overflow: auto; tab-size: 2; }
.pg-yaml-error { margin: 8px 0 0; font-size: .86rem; color: var(--bad); min-height: 1.3em; }
.pg-snippet { margin-top: 8px; background: var(--surface); border: 1px solid var(--a); border-radius: var(--radius-sm); padding: 12px 14px; }
.pg-snippet p { margin: 0 0 8px; font-size: .9rem; }
.pg-snippet pre { margin-bottom: 8px; }
.pg-trigger { display: flex; flex-wrap: wrap; align-items: flex-end; gap: 10px; margin-bottom: 12px; }
.pg-event-label, .pg-input { display: flex; flex-direction: column; gap: 4px; font-size: .78rem; color: var(--muted); }
.pg-event-label select, .pg-input select, .pg-input input { padding: 8px 10px; font-size: .88rem; max-width: 100%; }
.pg-event-label { flex: 1 1 220px; min-width: 0; }
.pg-inputs { display: flex; gap: 8px; flex-wrap: wrap; }
.pg-empty { padding: 28px; text-align: center; border: 1px dashed var(--line); border-radius: var(--radius); margin: 0; }
.run { padding: 18px; margin-bottom: 12px; }
.run-head { display: flex; gap: 12px; align-items: flex-start; }
.run-head strong { display: block; }
.run-head .muted { font-size: .82rem; }
.run-icon { flex: none; width: 26px; height: 26px; border-radius: 50%; display: grid; place-items: center; font-size: .8rem; font-weight: 700; color: #fff; background: var(--muted); }
.run-icon.success { background: var(--ok); }
.run-icon.failure { background: var(--bad); }
.run-icon.waiting, .run-icon.queued { background: var(--warn); }
.run-errors { margin-top: 12px; white-space: pre-wrap; word-break: break-word; background: var(--bad-soft); }
.run-facts { display: flex; flex-wrap: wrap; gap: 6px 18px; margin: 12px 0; font-size: .8rem; }
.run-facts div { display: flex; gap: 6px; min-width: 0; }
.run-facts dt { color: var(--muted); }
.run-facts dd { margin: 0; font-family: var(--mono); overflow-wrap: anywhere; }
.run-graph { display: flex; gap: 10px; overflow-x: auto; padding-bottom: 4px; }
.run-col { display: flex; flex-direction: column; gap: 8px; min-width: 150px; flex: 1; }
.run-col + .run-col { position: relative; }
.job { display: grid; grid-template-columns: auto 1fr; gap: 0 8px; align-items: center; text-align: left; padding: 9px 11px; border-radius: 12px; border: 1px solid var(--line); background: var(--surface-2); color: var(--text); cursor: pointer; font-size: .82rem; transition: border-color .25s, background .25s, opacity .25s; }
.job:hover, .job[aria-pressed="true"] { border-color: var(--a); }
.job-icon { grid-row: span 2; width: 18px; height: 18px; border-radius: 50%; display: grid; place-items: center; font-size: .66rem; font-weight: 700; color: #fff; background: var(--muted); }
.job-name { font-weight: 600; overflow-wrap: anywhere; }
.job-time { font-size: .72rem; color: var(--muted); font-family: var(--mono); }
.job.success .job-icon { background: var(--ok); }
.job.failure { border-color: color-mix(in srgb, var(--bad) 50%, transparent); }
.job.failure .job-icon { background: var(--bad); }
.job.cancelled .job-icon, .job.skipped .job-icon { background: var(--muted); }
.job.skipped { opacity: .6; }
.job.waiting .job-icon, .job.queued .job-icon { background: var(--warn); }
.job.is-queued { opacity: .35; }
.job.is-running { border-color: var(--a); box-shadow: 0 0 0 3px var(--accent-soft); }
.run-wait { margin-top: 12px; padding: 12px 14px; border-radius: 12px; background: var(--warn-soft); display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; }
.run-wait p { margin: 0; color: var(--warn-text); font-size: .9rem; }
.run-notes { list-style: none; margin: 12px 0 0; padding: 0; display: grid; gap: 6px; font-size: .82rem; }
.run-notes li { padding: 8px 12px; border-radius: 10px; background: var(--warn-soft); color: var(--warn-text); overflow-wrap: anywhere; }
.run-notes li.error { background: var(--bad-soft); color: var(--bad); }
.run-steps { margin-top: 14px; border-top: 1px solid var(--hair); padding-top: 12px; }
.run-steps h4 { margin: 0 0 8px; font-size: .95rem; overflow-wrap: anywhere; }
.run-job-note { margin: 0 0 8px; font-size: .86rem; color: var(--warn-text); background: var(--warn-soft); padding: 8px 12px; border-radius: 10px; }
.step { border-top: 1px solid var(--hair); }
.step summary { display: flex; gap: 8px; align-items: center; padding: 7px 2px; cursor: pointer; font-size: .84rem; list-style: none; }
.step summary::-webkit-details-marker { display: none; }
.step summary span:nth-child(2) { flex: 1; min-width: 0; overflow-wrap: anywhere; }
.step-icon { width: 16px; text-align: center; font-weight: 700; color: var(--muted); }
.step.success .step-icon { color: var(--ok); }
.step.failure .step-icon { color: var(--bad); }
.step-time { font: .72rem var(--mono); color: var(--muted); }
.step-tag { font-size: .7rem; color: var(--warn-text); background: var(--warn-soft); border-radius: 99px; padding: 1px 8px; }
.step-log { background: #0d1117; color: #e6edf3; font-size: .76rem; max-height: 320px; overflow: auto; margin: 0 0 8px; white-space: pre; }
.step-log .cmd { color: #79c0ff; }
.step-log .dim { color: #8b949e; }
.step-log .err { color: #ffa198; }
.step-log .warn { color: #e3b341; }
.step-log .grp { color: #d2a8ff; }
.pg-term { margin-top: 16px; background: #0d1117; color: #e6edf3; border-radius: var(--radius); border: 1px solid var(--hair); overflow: hidden; }
.pg-bar { padding: 10px 16px; border-bottom: 1px solid rgba(255, 255, 255, .07); }
.pg-bar em { font-style: normal; font-size: .76rem; color: #8b949e; }
.pg-out { height: 170px; overflow: auto; padding: 12px 16px 4px; font: 12.5px/1.6 var(--mono); }
.pg-line { white-space: pre-wrap; word-break: break-word; }
.pg-line.row, .pg-line.head { white-space: pre; word-break: normal; }
.pg-line.dim, .pg-line.head { color: #8b949e; }
.pg-line.cmd { color: #79c0ff; }
.pg-line.err { color: #ffa198; }
.pg-line.ok { color: #56d364; }
.pg-form { display: flex; align-items: center; gap: 10px; padding: 8px 16px 14px; font: 13px var(--mono); }
.pg-form span { color: #56d364; }
#pg-console-input { flex: 1; min-width: 0; font: inherit; color: #e6edf3; background: transparent; border: 0; outline: none; padding: 4px 0; box-shadow: none; }

/* Palette */
.palette { width: min(600px, calc(100vw - 32px)); margin: 12vh auto auto; padding: 0; border: 1px solid var(--hair); border-radius: var(--radius); background: var(--surface); color: var(--text); box-shadow: 0 24px 64px rgba(0, 0, 0, .18); }
.palette::backdrop { background: rgba(0, 0, 0, .3); }
#palette-input { width: 100%; font-size: 1.1rem; color: var(--text); background: transparent; border: 0; border-bottom: 1px solid var(--hair); border-radius: 0; padding: 18px 20px; outline: none; box-shadow: none; }
#palette-list { list-style: none; margin: 0; padding: 8px; max-height: 50vh; overflow-y: auto; }
#palette-list li { display: flex; justify-content: space-between; align-items: center; gap: 16px; padding: 10px 12px; border-radius: 10px; cursor: pointer; }
#palette-list li[aria-selected="true"] { background: var(--accent-soft); }
#palette-list li[aria-selected="true"] .pal-label { color: var(--a); }
.pal-kind { color: var(--muted); font-size: .78rem; flex: none; }
.palette-foot { font-size: .76rem; margin: 0; padding: 10px 20px 14px; border-top: 1px solid var(--hair); }

/* Architecture */
.arch-figure { position: relative; background: var(--surface); border: 1px solid var(--hair); border-radius: var(--radius); box-shadow: var(--shadow); padding: 20px; }
.arch-svg { display: block; width: 100%; height: auto; font-family: inherit; }
.arch-panel { fill: var(--surface-2); stroke: var(--hair); }
.arch-panel-label { fill: var(--muted); font-size: 12px; font-weight: 600; }
.arch-edge { fill: none; stroke: var(--line); stroke-width: 1.5; }
.arch-edge.is-on { stroke: var(--a); stroke-width: 2; stroke-dasharray: 6 5; animation: arch-flow .9s linear infinite; }
@keyframes arch-flow { to { stroke-dashoffset: -11; } }
.arch-dot { fill: var(--a); stroke: var(--surface); stroke-width: 2; opacity: 0; }
.arch-dot.is-on { opacity: 1; }
#arch-arrow path { fill: var(--line); }
#arch-arrow-on path { fill: var(--a); }
.arch-box { cursor: pointer; outline: none; transition: opacity .15s; }
.arch-box rect { fill: var(--surface); stroke: var(--line); transition: fill .15s, stroke .15s; }
.arch-name { fill: var(--text); font-weight: 600; text-anchor: middle; }
.arch-short { fill: var(--muted); text-anchor: middle; }
.arch-box:hover rect, .arch-box.is-on rect { fill: var(--accent-soft); stroke: var(--a); stroke-width: 2; }
.arch-box.is-near rect { stroke: var(--a); }
.arch-box:focus-visible rect { stroke: var(--a); stroke-width: 3; }
.has-focus .arch-box:not(.is-on):not(.is-near), .has-focus .arch-edge:not(.is-on) { opacity: .4; }
.arch-tour { display: flex; align-items: center; gap: 14px; margin-top: 14px; flex-wrap: wrap; }
.arch-caption { margin: 0; color: var(--muted); font-size: .95rem; flex: 1; min-width: 220px; }
.arch-step { display: inline-block; margin-right: 8px; padding: 1px 8px; border-radius: 99px; background: var(--accent-soft); color: var(--a); font-size: .78rem; font-weight: 600; }
.arch-tip { position: absolute; left: 0; top: 0; width: 300px; pointer-events: none; background: var(--surface); border: 1px solid var(--hair); border-radius: var(--radius-sm); box-shadow: var(--shadow); padding: 14px 16px; z-index: 2; opacity: 0; visibility: hidden; transition: opacity .16s, visibility .16s; }
.arch-tip.is-shown { opacity: 1; visibility: visible; }
.arch-tip h3 { margin: 0 0 4px; font-size: 1rem; }
.arch-tip p { margin: 0 0 8px; font-size: .86rem; line-height: 1.45; }
.arch-detail { margin-top: 16px; }
.arch-detail h3 { margin: 0 0 6px; font-size: 1.15rem; }
.arch-detail h4 { margin: 14px 0 4px; font-size: .85rem; color: var(--muted); }
.arch-detail p, .arch-detail ul { margin: 0; font-size: .92rem; }
.arch-detail pre { margin-top: 6px; font-size: .8rem; white-space: pre-wrap; word-break: break-word; }
.arch-where { color: var(--a); font-size: .78rem; font-weight: 600; margin: 0 0 2px; }

/* Footer */
.foot { margin-top: 96px; background: var(--surface-2); border-top: 1px solid var(--hair); color: var(--muted); font-size: .86rem; }
.foot-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 40px; padding-top: 48px; padding-bottom: 36px; }
.foot-brand .brand { font-size: 1.05rem; gap: 10px; }
.foot-brand .brand img { width: 28px; height: 28px; }
.foot-brand p { margin: 14px 0 18px; max-width: 420px; line-height: 1.55; }
.foot-col { display: flex; flex-direction: column; gap: 10px; }
.foot-col h2 { margin: 4px 0; font-size: .8rem; font-weight: 600; color: var(--text); letter-spacing: 0; }
.foot-col a { color: var(--muted); width: fit-content; }
.foot-col a:hover { color: var(--text); text-decoration: none; }
.foot-base { display: flex; flex-direction: column; gap: 8px; border-top: 1px solid var(--hair); padding-top: 18px; padding-bottom: 40px; font-size: .8rem; }
.foot-base p { margin: 0; }
.foot-tm { font-size: .74rem; }

/* Motion: only where it says what changed. */
@keyframes aq-in { from { opacity: 0; transform: translateY(6px); } }
@keyframes aq-pop { 0% { opacity: 0; transform: scale(.4); } 60% { transform: scale(1.25); } 100% { opacity: 1; transform: none; } }
.tab.tab-in { animation: aq-in .24s var(--ease) both; }
.pg-goal.done, .feedback.ok, .feedback.bad { animation: aq-in .24s var(--ease) both; }
.pg-scn.just-solved .pg-scn-done { display: inline-block; animation: aq-pop .5s var(--ease) both; }
.job.is-running .job-icon { animation: aq-pulse 1s ease-in-out infinite; }
@keyframes aq-pulse { 50% { opacity: .35; } }

@media (max-width: 1000px) {
  .pg-body { grid-template-columns: 1fr; }
  .pg-code-wrap { height: 380px; }
}
@media (max-width: 860px) {
  .xray { grid-template-columns: 1fr; }
  #xray-note { position: static; }
  .doctor-group, .pg-group { grid-template-columns: 1fr; }
  .start-grid { grid-template-columns: minmax(0, 1fr); }
  .stats { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
  body { font-size: 16px; }
  .wrap { padding: 0 16px; }
  .kbd-btn span { display: none; }
  .kbd-btn { padding: 5px; }
  .brand { font-size: .88rem; }
  .problems .top nav { flex-basis: 100%; }
  .problems .top nav a { padding: 6px 8px; }
  .doors { grid-template-columns: minmax(0, 1fr); }
  .door { padding: 22px; }
  .door-search { flex-direction: column; }
  .hero { padding: 48px 0 16px; }
  .stage { padding: 18px; border-radius: 24px; margin-top: 40px; }
  .pipe { grid-template-columns: 1fr 1fr; }
  .stats { grid-template-columns: 1fr 1fr; margin-top: 32px; }
  .stats div { padding: 16px; }
  .stats b { font-size: 30px; }
  .bento { grid-template-columns: 1fr; }
  .tile, .tile.wide { grid-column: auto; min-height: 0; }
  .level { grid-template-columns: auto minmax(0, 1fr); padding: 14px 16px; }
  .level .num { display: none; }
  .level .actions { grid-column: 2; }
  .card { padding: 18px; }
  .pg-scenarios { display: flex; flex-wrap: nowrap; gap: 8px; overflow-x: auto; scrollbar-width: none; margin: 0 -16px 14px; padding: 2px 16px; background: none; border: 0; border-radius: 0; box-shadow: none; }
  .pg-group, .pg-group-items { display: contents; }
  .pg-group-name { flex: none; min-height: 0; padding-left: 12px; border-left: 1px solid var(--line); white-space: nowrap; }
  .pg-group:first-child .pg-group-name { border-left: 0; padding-left: 0; }
  .pg-scn { flex: none; white-space: nowrap; }
  .pg-code-wrap { height: 340px; }
  .foot-grid { grid-template-columns: 1fr 1fr; gap: 28px; }
  .foot-brand { grid-column: 1 / -1; }
  .cheats li { flex-direction: column; align-items: stretch; gap: 10px; }
  .guide-cols { grid-template-columns: 1fr; }
  .answer-head { flex-direction: column; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; }
  html { scroll-behavior: auto; }
}

/* The static problems page */
.problems-title { font-size: clamp(2rem, 4.5vw, 3rem); margin: 48px 0 14px; }
.toc { margin-bottom: 24px; columns: 2 280px; }
.toc h2 { font-size: .9rem; margin: 0 0 6px; break-after: avoid; }
.toc ul { margin: 0 0 14px; padding-left: 18px; font-size: .9rem; }
.problems .answer { margin-bottom: 18px; scroll-margin-top: 72px; }
.problems .answer h2 { margin: 0; font-size: 1.35rem; overflow-wrap: anywhere; }
.problems .answer h3 { margin: 18px 0 6px; font-size: .82rem; color: var(--muted); letter-spacing: 0; }
.problems .top nav { justify-content: flex-end; }
@media (prefers-color-scheme: dark) {
  .run-icon, .job-icon { color: #000; }
}

/* The merge box under a pull request run */
.merge-box { margin-top: 12px; padding: 12px 14px; border-radius: 12px; background: var(--ok-soft); font-size: .86rem; }
.merge-box.blocked { background: var(--bad-soft); }
.merge-box p { margin: 0 0 6px; }
.merge-box ul { margin: 0; padding-left: 18px; }
.merge-box li.expected, .merge-box li.failure { color: var(--bad); }
.merge-box li.success { color: var(--ok); }

/* Learning loop: continue, on-call shift, streak, and the order check in each level. */
.engage { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin: 16px 0 0; text-align: left; }
.eng-card { display: flex; flex-direction: column; align-items: flex-start; gap: 6px; padding: 24px; border-radius: 22px; background: var(--surface); border: 1px solid var(--hair); }
.eng-card h3 { margin: 0; font-size: 1.2rem; letter-spacing: -.02em; }
.eng-card p { margin: 0; color: var(--muted); font-size: .95rem; }
.eng-card > .pill, .eng-card > .eng-row { margin-top: auto; }
.eng-card > p:not(.eng-k) { margin-bottom: 10px; }
.eng-k { display: flex; align-items: center; gap: 8px; color: var(--a) !important; font-weight: 600; font-size: .85rem !important; }
.eng-shift.paging { background: var(--warn-soft); border-color: var(--warn); }
.eng-shift.paging .eng-k { color: var(--warn-text) !important; }
.eng-time { font-variant-numeric: tabular-nums; }
.eng-dot { width: 9px; height: 9px; border-radius: 50%; background: var(--warn); animation: eng-page 1.2s ease-in-out infinite; }
@keyframes eng-page { 50% { opacity: .25; } }
.eng-row { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; padding-top: 12px; }
.eng-row .more, .eng-orderbox .more { background: none; border: 0; color: var(--a); font: inherit; cursor: pointer; padding: 0; }
.eng-score { display: flex; align-items: baseline; gap: 10px; color: var(--text) !important; font-size: 2.2rem !important; font-weight: 700; letter-spacing: -.04em; line-height: 1.1; }
.eng-score span { font-size: .95rem; font-weight: 600; letter-spacing: 0; color: var(--a); }
.eng-bar { display: block; width: 100%; height: 6px; border-radius: 99px; background: var(--code-bg); overflow: hidden; margin: 4px 0; }
.eng-bar-fill { display: block; height: 100%; border-radius: inherit; background: var(--accent-fill); }
.eng-session { font-size: .85rem !important; font-variant-numeric: tabular-nums; }
.eng-board { grid-column: 1 / -1; padding: 24px; border-radius: 22px; background: var(--surface); border: 1px solid var(--hair); display: grid; gap: 16px; }
.eng-panels { display: grid; grid-template-columns: 1fr 1.3fr; gap: 16px; }
.eng-panel { display: flex; flex-direction: column; gap: 6px; padding: 20px; border-radius: 16px; background: var(--surface-2); border: 1px solid var(--hair); }
.eng-panel p { margin: 0; color: var(--muted); font-size: .9rem; }
.eng-radar { width: 100%; max-width: 340px; align-self: center; margin: 4px 0; overflow: visible; }
.eng-r-grid { fill: none; stroke: var(--line); stroke-width: 1; }
.eng-r-shape { fill: color-mix(in srgb, var(--a) 22%, transparent); stroke: var(--a); stroke-width: 2; stroke-linejoin: round; }
.eng-r-dot { fill: var(--a); }
.eng-r-label { fill: var(--muted); font-size: 10.5px; font-family: inherit; }
.eng-slo { padding: 3px 10px; border-radius: 99px; font-size: .78rem !important; }
.eng-slo.ok { color: var(--ok) !important; background: var(--ok-soft); }
.eng-slo.low { color: var(--warn-text) !important; background: var(--warn-soft); }
.eng-uptime { display: flex; gap: 2px; height: 96px; margin-top: 14px; }
.eng-30 { display: none; }
.eng-up { flex: 1; border-radius: 2px; background: var(--code-bg); }
.eng-up.on { background: var(--accent-2); }
.eng-up-axis { display: flex; justify-content: space-between; font-size: .75rem; color: var(--muted); }
.eng-budget { display: flex; align-items: center; gap: 10px; margin-top: auto; padding-top: 10px; font-size: .88rem; }
.eng-pips { display: flex; gap: 4px; }
.eng-pips span { width: 10px; height: 10px; border-radius: 50%; border: 1.5px solid var(--accent-2); }
.eng-pips span.on { background: var(--accent-2); }
.eng-stats { display: grid; grid-template-columns: repeat(5, 1fr); gap: 1px; background: var(--hair); border-radius: 14px; overflow: hidden; border: 1px solid var(--hair); }
.eng-stats div { background: var(--surface); padding: 14px 16px; display: flex; flex-direction: column; }
.eng-stats b { font-size: 1.3rem; letter-spacing: -.02em; font-variant-numeric: tabular-nums; }
.eng-stats span { color: var(--muted); font-size: .82rem; }
.eng-orderbox { display: grid; gap: 10px; }
.eng-order { list-style: none; counter-reset: step; margin: 0; padding: 0; display: grid; gap: 6px; }
.eng-order li { counter-increment: step; display: flex; align-items: center; gap: 10px; padding: 6px 8px 6px 12px; border-radius: var(--radius-sm); border: 1px solid var(--hair); background: var(--surface-2); }
.eng-order li::before { content: counter(step); color: var(--muted); font-size: .8rem; width: 1ch; }
.eng-order li.ok { border-color: var(--ok); background: var(--ok-soft); }
.eng-order li.off { border-color: var(--bad); background: var(--bad-soft); }
.eng-step { flex: 1; font-size: .9rem; }
.eng-moves { display: flex; gap: 4px; }
.eng-moves button { width: 32px; height: 32px; border-radius: 9px; border: 1px solid var(--line); background: var(--surface); color: var(--text); cursor: pointer; }
.eng-moves button:disabled { opacity: .35; cursor: default; }
.eng-msg { margin: 0; font-size: .9rem; color: var(--muted); }
@media (max-width: 860px) { .engage { grid-template-columns: 1fr; } .eng-panels, .eng-stats { grid-template-columns: 1fr 1fr; } .eng-panels { grid-template-columns: 1fr; } .eng-up:nth-child(-n+60), .eng-90 { display: none; } .eng-30 { display: inline; } .eng-uptime { height: 64px; gap: 3px; } .eng-stats div:last-child { grid-column: 1 / -1; } }

/* DevOps Nimbus brand: the loop mark in the header and footer, a command chip in the eyebrow. */
.brand img.mark { width: 37px; }
.foot-brand .brand img.mark { width: 47px; }
.brand-track { color: var(--a); font-weight: 600; padding-left: 8px; border-left: 1px solid var(--line); }
.eyebrow { display: inline-flex; align-items: center; gap: 8px; }

.eng-carry { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.eng-file { position: relative; }
.eng-file input { position: absolute; inset: 0; opacity: 0; cursor: pointer; }
.eng-file:focus-within { outline: 2px solid var(--a); outline-offset: 2px; }

/* Header: a Learn | Fix switch, then the current mode's pages. Learn is light; Fix is "on-call dark". */
:root { --oncall: #1d1d1f; --on-oncall: #ffffff; }
@media (prefers-color-scheme: dark) { :root { --oncall: #f5f5f7; --on-oncall: #000000; } }
.top { padding-bottom: 0; }
.top-inner { justify-content: space-between; }
.switch { position: relative; display: grid; grid-template-columns: 1fr 1fr; padding: 3px; border-radius: 99px; background: var(--code-bg); flex: none; }
.switch::before { content: ""; position: absolute; inset: 3px auto 3px 3px; width: calc(50% - 3px); border-radius: 99px; background: var(--surface); box-shadow: 0 1px 3px rgba(0, 0, 0, .12); transition: transform .28s var(--ease, ease), background-color .28s; }
[data-mode="fix"] .switch::before { transform: translateX(100%); background: var(--oncall); }
.sw { position: relative; display: inline-flex; align-items: center; justify-content: center; gap: 7px; min-width: 96px; padding: 6px 16px; border-radius: 99px; font-size: .86rem; font-weight: 600; color: var(--muted); text-decoration: none; transition: color .28s; }
.sw:hover { text-decoration: none; color: var(--text); }
.sw.learn[aria-current] { color: var(--a); }
.sw.fix[aria-current] { color: var(--on-oncall); }
.sub-row { box-shadow: 0 -1px 0 var(--hair); max-width: none; }
.sub-row > .subnav { max-width: 1080px; margin: 0 auto; }
.subnav { display: flex; justify-content: center; }
.subnav .mode { display: flex; align-items: center; gap: 4px; }
.subnav .mode.fix, [data-mode="fix"] .subnav .mode.learn { display: none; }
[data-mode="fix"] .subnav .mode.fix { display: flex; }
.subnav .mode-k { font-size: .78rem; color: var(--muted); margin-right: 14px; white-space: nowrap; }
.subnav a { position: relative; padding: 11px 12px; font-size: .84rem; color: var(--text); opacity: .75; text-decoration: none; white-space: nowrap; }
.subnav a:hover { opacity: 1; text-decoration: none; }
.subnav a[aria-current="page"] { opacity: 1; font-weight: 600; }
.subnav a[aria-current="page"]::after { content: ""; position: absolute; left: 12px; right: 12px; bottom: -1px; height: 2px; border-radius: 2px; background: var(--accent-fill); }
[data-mode="fix"] .subnav a[aria-current="page"]::after { background: var(--oncall); }
@media (max-width: 720px) {
  .top-inner { flex-wrap: wrap; height: auto; gap: 8px 10px; padding-top: 8px; padding-bottom: 8px; }
  .brand { flex: 1; }
  .switch { order: 3; flex-basis: 100%; }
  .subnav .mode-k { display: none; }
  .subnav { justify-content: flex-start; overflow-x: auto; scrollbar-width: none; }
  .sw { min-width: 0; padding: 6px 12px; }
  .subnav a { padding: 11px 8px; font-size: .8rem; }
  .subnav a[aria-current="page"]::after { left: 8px; right: 8px; }
}
@media (prefers-reduced-motion: reduce) { .switch::before, .sw { transition: none; } }
.door.fix { background: var(--oncall); border-color: transparent; color: var(--on-oncall); }
.door.fix p, .door.fix .door-k { color: color-mix(in srgb, var(--on-oncall) 72%, transparent); }
.door.fix .pill { background: var(--on-oncall); color: var(--oncall); border-color: transparent; font-weight: 600; }
.door.fix .pill:hover { background: color-mix(in srgb, var(--on-oncall) 88%, var(--oncall)); }
.door.fix input[type="search"] { border-color: transparent; }

/* Header brand: a round back button and "DevOps Nimbus" go to all tracks; the track name goes to this track's start. */
.brand > a { display: flex; align-items: center; gap: 8px; text-decoration: none; }
.brand-hub { color: inherit; }
.brand-back { display: grid; place-items: center; width: 26px; height: 26px; border-radius: 50%; background: var(--code-bg); color: var(--text); transition: background .2s, transform .2s; }
.brand-back svg { display: block; margin-left: -1px; }
.brand-hub:hover .brand-back { background: var(--line); transform: translateX(-2px); }
.brand > a:hover { text-decoration: none; }
.brand-hub:hover > span:not(.brand-back) { opacity: .75; }
.brand-hub:focus-visible { outline: 2px solid var(--a); outline-offset: 3px; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
@media (prefers-reduced-motion: reduce) { .brand-back { transition: none; } }
/* Narrow phones: the logo stands for DevOps Nimbus so the header keeps one row. */
@media (max-width: 440px) { .brand-hub > span:not([class]) { display: none; } }

/* While a feature's code is still arriving, its space shows calm grey shapes of what is coming,
   sized to what replaces them, and the first screen fades in once as one piece. Both stop for
   reduced motion. */
.pg-scenarios:empty, .pg-brief:empty, .playground:has(.pg-scenarios:empty) .pg-out:empty, #quiz-list:empty, .pg-code-wrap:has(> .pg-gutter:empty) {
  background: repeating-linear-gradient(to bottom, var(--code-bg) 0 12px, transparent 12px 28px) content-box;
  animation: nimbus-skel 1.6s ease-in-out infinite alternate;
}
.pg-scenarios:empty { min-height: 1195px; padding-top: 20px; padding-bottom: 20px; }
.pg-brief:empty { min-height: 270px; background-size: 80% 100%; background-repeat: no-repeat; }
/* The run: the outline of the box it appears in. */
#pg-output:empty { min-height: 108px; margin-top: 12px; border: 1px dashed var(--line); border-radius: var(--radius-sm); animation: nimbus-skel 1.6s ease-in-out infinite alternate; }
.playground:has(.pg-scenarios:empty) .pg-out:empty { background-image: repeating-linear-gradient(to bottom, color-mix(in srgb, #fff 9%, transparent) 0 10px, transparent 10px 24px); background-size: 70% 100%; background-repeat: no-repeat; }
#quiz-list:empty { min-height: 320px; }
/* The editor: grey lines of YAML in the code area. */
.pg-code-wrap:has(> .pg-gutter:empty) { background: var(--surface) repeating-linear-gradient(to bottom, var(--code-bg) 0 10px, transparent 10px 20px) 56px 17px / 60% calc(100% - 34px) no-repeat; }
/* The file tab. */
.pg-files:empty { min-height: 27px; animation: nimbus-skel 1.6s ease-in-out infinite alternate; }
.pg-files:empty::before { content: ""; width: 72px; height: 27px; border-radius: 8px; background: var(--code-bg); }
/* The diagram: an empty card of the same size as the drawing. */
#arch:empty {
  padding-top: calc(50% + 69px); border: 1px solid var(--hair); border-radius: var(--radius); box-shadow: var(--shadow);
  background: var(--surface) linear-gradient(var(--code-bg), var(--code-bg)) 50% 50% / calc(100% - 56px) calc(100% - 56px) no-repeat;
  animation: nimbus-skel 1.6s ease-in-out infinite alternate;
}
@keyframes nimbus-skel { from { opacity: .5; } to { opacity: 1; } }
/* The picker card and the brief wrap into more rows as the page narrows. */
@media (max-width: 1103px) { .pg-scenarios:empty { min-height: 1237px; } }
@media (max-width: 1011px) { .pg-scenarios:empty { min-height: 1279px; } }
@media (max-width: 975px) { .pg-scenarios:empty { min-height: 1321px; } }
@media (max-width: 967px) { .pg-scenarios:empty { min-height: 1363px; } }
@media (max-width: 949px) { .pg-scenarios:empty { min-height: 1447px; } }
@media (max-width: 931px) { .pg-scenarios:empty { min-height: 1489px; } }
@media (max-width: 929px) { .pg-scenarios:empty { min-height: 1531px; } }
@media (max-width: 911px) { .pg-scenarios:empty { min-height: 1573px; } }
@media (max-width: 893px) { .pg-scenarios:empty { min-height: 1615px; } }
@media (max-width: 889px) { .pg-scenarios:empty { min-height: 1657px; } }
@media (max-width: 883px) { .pg-scenarios:empty { min-height: 1699px; } }
@media (max-width: 869px) { .pg-scenarios:empty { min-height: 1741px; } }
@media (max-width: 861px) { .pg-scenarios:empty { min-height: 1573px; } }
@media (max-width: 785px) { .pg-scenarios:empty { min-height: 1615px; } }
@media (max-width: 749px) { .pg-scenarios:empty { min-height: 1657px; } }
@media (max-width: 741px) { .pg-scenarios:empty { min-height: 1699px; } }
@media (max-width: 723px) { .pg-scenarios:empty { min-height: 1783px; } }
@media (max-width: 823px) { .pg-brief:empty { min-height: 295px; } }
@media (max-width: 753px) { .pg-brief:empty { min-height: 347px; } }
@media (max-width: 721px) { .pg-brief:empty { min-height: 333px; } }
@media (max-width: 571px) { .pg-brief:empty { min-height: 354px; } }
@media (max-width: 445px) { .pg-brief:empty { min-height: 378px; } }
@media (max-width: 425px) { .pg-brief:empty { min-height: 401px; } }
@media (max-width: 407px) { .pg-brief:empty { min-height: 423px; } }
@media (max-width: 1001px) { #pg-output:empty { min-height: 83px; } }
@media (max-width: 720px) {
  /* The scenario picker is one scrolling row of pills here. */
  .pg-scenarios:empty { min-height: 38px; padding-top: 2px; padding-bottom: 2px; background: none; }
  .pg-scenarios:empty::before { content: ""; flex: none; width: 96px; height: 34px; border-radius: 99px; background: var(--code-bg); box-shadow: 104px 0 0 var(--code-bg), 208px 0 0 var(--code-bg), 312px 0 0 var(--code-bg), 416px 0 0 var(--code-bg); }
  #pg-output:empty { min-height: 82px; }
  #arch:empty { padding-top: calc(217.38% - 1px); background-size: calc(100% - 32px) calc(100% - 32px); }
}
@media (max-width: 605px) { #arch:empty { padding-top: calc(217.38% + 7px); } }
@media (max-width: 577px) { #pg-output:empty { min-height: 105px; } }
@media (max-width: 439px) { #arch:empty { padding-top: calc(217.38% + 57px); } }
#stage:not(:empty), #stats:not(:empty), #engage:not(:empty), #levels:not(:empty) { animation: nimbus-fade .2s ease-out both; }
@keyframes nimbus-fade { from { opacity: 0; transform: translateY(4px); } }
@media (prefers-reduced-motion: reduce) {
  .pg-scenarios:empty, .pg-brief:empty, #pg-output:empty, .playground:has(.pg-scenarios:empty) .pg-out:empty, #quiz-list:empty, .pg-code-wrap:has(> .pg-gutter:empty), .pg-files:empty, #arch:empty { animation: none; }
  #stage:not(:empty), #stats:not(:empty), #engage:not(:empty), #levels:not(:empty) { animation: none; }
}

/* The eyebrow's command chip stands for the track; the $ takes the track colour. */
.eyebrow-cmd { font: 500 .8rem/1 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; background: #1d1d1f; color: #f5f5f7;
  padding: 5px 8px; border-radius: 7px; white-space: nowrap; }
.eyebrow-cmd span { color: #ff7ac6; }
.eyebrow:has(.eyebrow-cmd) { display: block; }
.eyebrow-cmd { display: inline-block; margin-right: 8px; vertical-align: .12em; }

/* A short light in the track colour travels round the edge of the home cards, each at its own point.
   On white it uses a deeper shade so it still shows; in dark mode the bright track colour. */
:root { --accent-edge: #ff3dac; }
@media (prefers-color-scheme: dark) { :root { --accent-edge: var(--accent-fill); } }
@property --edge { syntax: "<angle>"; inherits: false; initial-value: 0deg; }
.door, .tile, .stage-card { position: relative; }
.door::before, .tile::before, .stage-card::before { content: ""; position: absolute; inset: -1px; border-radius: inherit; padding: 2.5px; pointer-events: none;
  background: conic-gradient(from var(--edge), transparent 0 64%, color-mix(in srgb, var(--accent-edge) 55%, transparent) 80%, var(--accent-edge) 90%, var(--accent-edge) 97%, transparent 100%);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0); -webkit-mask-composite: xor;
  mask: linear-gradient(#000 0 0) content-box exclude, linear-gradient(#000 0 0);
  animation: edge 7s linear infinite; animation-delay: calc(var(--i, 0) * -1.3s); }
@keyframes edge { to { --edge: 360deg; } }
:is(.door, .tile, .stage-card):nth-child(2) { --i: 1; } :is(.door, .tile, .stage-card):nth-child(3) { --i: 2; }
:is(.door, .tile, .stage-card):nth-child(4) { --i: 3; } :is(.door, .tile, .stage-card):nth-child(5) { --i: 4; }
:is(.door, .tile, .stage-card):nth-child(6) { --i: 5; } :is(.door, .tile, .stage-card):nth-child(7) { --i: 6; }
@media (prefers-reduced-motion: reduce) { .door::before, .tile::before, .stage-card::before { display: none; } }