/* DevOps Nimbus Kubernetes companion site.
   Calm, product-page styling: system font, generous space, one accent. */
:root {
  --bg: #f5f5f7;
  --surface: #ffffff;
  --surface-2: #fbfbfd;
  --text: #1d1d1f;
  --muted: #6e6e73;
  --line: #d2d2d7;
  --hair: rgba(0, 0, 0, .08);
  --accent: #0073e1; --accent-fill: #2997ff; --accent-fill-hover: #2485e0; --on-fill: #1d1d1f;
  --accent-hover: #0062bf;
  --accent-2: #0073e1;
  --accent-soft: #e5f3ff;
  --on-accent: #ffffff;
  --k8s: var(--accent);
  --ok: #1d8a3a;
  --ok-soft: #e9f6ec;
  --bad: #d70015;
  --bad-soft: #fdecee;
  --warn: #c77700;
  --warn-text: #8a5300;
  --warn-soft: #fff4e0;
  --code-bg: #f0f0f3;
  --nav: rgba(251, 251, 253, .8);
  --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(.28, .11, .32, 1);
  --dur-fast: .15s;
  --dur: .24s;
  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);
    --accent: #2997ff; --accent-fill: #2997ff; --accent-fill-hover: #49a7ff; --on-fill: #000000;
    --accent-hover: #54acff;
    --accent-2: #2997ff;
    --accent-soft: #192d42;
    --on-accent: #000000;
    --ok: #30d158;
    --ok-soft: #0f2e18;
    --bad: #ff6961;
    --bad-soft: #3a1414;
    --warn: #ffb340;
    --warn-text: #ffcc80;
    --warn-soft: #3a2a0c;
    --code-bg: #2c2c2e;
    --nav: rgba(22, 22, 23, .8);
    --shadow: none;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: 96px; }
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: -.022em;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
code, pre { font-family: "SF Mono", ui-monospace, Menlo, Consolas, monospace; 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(--accent); outline-offset: 3px; border-radius: 8px; }

.wrap { max-width: 1024px; margin: 0 auto; padding: 0 22px; }
.skip { position: absolute; left: -9999px; }
.skip:focus { left: 16px; top: 8px; background: var(--surface); padding: 6px 10px; z-index: 30; }
.muted { color: var(--muted); }
.note { color: var(--muted); font-size: .88rem; }
.lede { color: var(--muted); font-size: 1.15rem; margin: -6px 0 24px; max-width: 680px; }

/* Navigation */
.top {
  position: sticky; top: 0; z-index: 20; background: var(--nav);
  -webkit-backdrop-filter: saturate(180%) blur(20px); backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--hair);
}
.top-inner { display: flex; align-items: center; gap: 20px; 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; }
/* Two modes: Learn (the course) and Fix (the reference for something broken now). */

main { padding-top: 8px; padding-bottom: 64px; min-height: 70vh; }
.tab > h2 { font-size: clamp(2rem, 4.5vw, 3rem); font-weight: 700; margin: 48px 0 14px; }

/* Hero */
.hero { text-align: center; padding: 72px 0 40px; }
.eyebrow { color: var(--k8s); font-weight: 600; font-size: .95rem; margin: 0 0 10px; }
.hero h1 { font-size: clamp(2.6rem, 7vw, 4.5rem); font-weight: 700; letter-spacing: -.045em; margin: 0 0 18px; line-height: 1.04; }
.hero .sub { color: var(--muted); font-size: clamp(1.1rem, 2.2vw, 1.4rem); line-height: 1.38; max-width: 680px; margin: 0 auto 30px; letter-spacing: -.02em; }
.ctas { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.pill {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px; min-height: 44px; padding: 0 22px;
  border-radius: 99px; font: inherit; font-size: 1rem; color: var(--accent); background: transparent;
  border: 1px solid var(--accent); 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; }
.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: var(--radius); 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(--accent); }
.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 .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; }
.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: 32px; }

.section-title { font-size: clamp(1.7rem, 3.5vw, 2.4rem); font-weight: 700; margin: 72px 0 8px; }
.section-title code { font-size: .78em; }
.section-sub { color: var(--muted); font-size: 1.1rem; margin: 0 0 24px; }

/* Request flow */
.flow-block { margin-top: 24px; }
.flow { list-style: none; padding: 0; margin: 0 0 16px; display: grid; grid-template-columns: repeat(7, minmax(0, 1fr)); gap: 10px; position: relative; }
.flow::before { content: ""; position: absolute; left: 7%; right: 7%; top: 34px; height: 2px; background: var(--line); z-index: 0; }
.step { position: relative; z-index: 1; }
.step button {
  width: 100%; display: flex; flex-direction: column; align-items: center; gap: 6px; padding: 14px 6px 12px;
  font: inherit; color: var(--text); background: transparent; border: 0; border-radius: var(--radius-sm); cursor: pointer;
  transition: background .25s var(--ease);
}
.step button:hover { background: var(--surface); }
.step .dot {
  width: 40px; height: 40px; border-radius: 50%; display: grid; place-items: center; font-weight: 600; font-size: .9rem;
  background: var(--surface); color: var(--muted); border: 2px solid var(--line);
  transition: background .35s var(--ease), border-color .35s var(--ease), color .35s var(--ease), transform .35s var(--ease), box-shadow .35s var(--ease);
}
.step.past .dot { border-color: var(--k8s); color: var(--k8s); }
.step.on .dot { background: var(--k8s); border-color: var(--k8s); color: #fff; transform: scale(1.12); box-shadow: 0 0 0 6px color-mix(in srgb, var(--accent) 18%, transparent); }
.step-name { font-weight: 600; font-size: .9rem; text-align: center; }
.step-role { font-size: .75rem; color: var(--muted); text-align: center; }
.flow-detail { min-height: 196px; }
.flow-detail h3 { font-size: 1.5rem; margin: 2px 0 8px; }
.flow-detail p { margin: 0 0 14px; max-width: 720px; }
.flow-controls { display: flex; justify-content: center; margin-top: 16px; }

/* Start */
.start-grid { display: grid; grid-template-columns: 1fr 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); font-style: normal; }
.start-note { margin: 14px 0 0; font-size: .86rem; line-height: 1.5; color: var(--muted); }
.start-note strong { color: var(--text); font-weight: 600; }
.start-note code { font-size: .82rem; background: var(--code-bg); border-radius: 6px; padding: 1px 6px; }

/* Stages */
.stages { display: grid; grid-template-columns: repeat(7, minmax(0, 1fr)); gap: 12px; margin: 22px 0 18px; }
.stage-card {
  display: flex; flex-direction: column; gap: 2px; padding: 16px; border-radius: var(--radius); background: var(--surface);
  color: var(--text); box-shadow: var(--shadow); border: 1px solid var(--hair); transition: transform .25s var(--ease);
}
.stage-card:hover { text-decoration: none; transform: translateY(-2px); }
.stage-card strong { font-size: 1rem; }
.stage-card .muted { font-size: .8rem; }
.stage-num { font-size: .72rem; color: var(--muted); }
.ring {
  --p: 0; width: 28px; height: 28px; border-radius: 50%; margin-bottom: 8px;
  background: conic-gradient(var(--k8s) calc(var(--p) * 1%), var(--line) 0);
  -webkit-mask: radial-gradient(circle, transparent 9px, #000 10px); mask: radial-gradient(circle, transparent 9px, #000 10px);
}
.stage-card.complete .ring { background: var(--ok); }

.progress-row { display: flex; align-items: center; gap: 14px; margin: 6px 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(--k8s); border-radius: 99px; transition: width .5s var(--ease); }
#bar-text { color: var(--muted); font-size: .85rem; white-space: nowrap; }

/* Levels */
.stage { font-size: 1.25rem; font-weight: 700; margin: 40px 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 1fr auto; align-items: center; gap: 16px; padding: 16px 20px; border-top: 1px solid var(--hair); transition: background .2s; }
.level:first-child { border-top: 0; }
.level:hover { background: var(--surface-2); }
.level input { width: 20px; height: 20px; accent-color: var(--ok); }
.level .num { font: .82rem "SF Mono", ui-monospace, Menlo, monospace; color: var(--muted); }
.level .what { display: flex; flex-direction: column; min-width: 0; }
.level .what a { font-weight: 600; color: var(--text); }
.level.done .what a { color: var(--muted); }
.level .topic { color: var(--muted); font-size: .88rem; }
.level .actions { display: flex; gap: 14px; align-items: center; }
.small { font-size: .9rem; }
.cmd { font-size: .78rem; }

/* Cards and forms */
.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; }
select, input[type="search"] {
  font: inherit; color: var(--text); background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius-sm); padding: 11px 14px; transition: border-color .2s;
}
select:focus, input[type="search"]:focus { border-color: var(--accent); outline: none; box-shadow: 0 0 0 4px var(--accent-soft); }

/* 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;
}
.score .meter { display: block; height: 6px; background: var(--line); border-radius: 99px; overflow: hidden; }
.score .fill { display: block; height: 100%; width: 0; background: var(--accent-fill); transition: width .35s var(--ease); }
.score .result { margin: 0; }
.linkish { font: inherit; color: var(--accent); background: none; border: 0; padding: 0; cursor: pointer; }
.linkish:hover { text-decoration: underline; }
.question { margin-bottom: 16px; }
.question h3 { font-size: 1.15rem; margin: 0 0 16px; font-weight: 600; line-height: 1.35; letter-spacing: -.02em; }
.tag { margin: 0 0 6px; font-size: .78rem; color: var(--muted); font-weight: 500; }
.options { display: grid; gap: 10px; }
.opt {
  font: inherit; 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 var(--ease), background .2s var(--ease), transform .15s var(--ease);
}
.opt:hover:not(:disabled) { border-color: var(--accent); background: var(--surface); }
.opt:active:not(:disabled) { transform: scale(.995); }
.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); }

/* YAML X-ray */
.seg { display: inline-flex; background: var(--code-bg); border-radius: 99px; padding: 3px; margin-bottom: 18px; flex-wrap: wrap; }
.seg button { font: inherit; font-size: .9rem; border: 0; background: transparent; color: var(--muted); padding: 7px 18px; border-radius: 99px; cursor: pointer; transition: background .2s, color .2s; }
.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; }
.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 "SF Mono", ui-monospace, Menlo, monospace; opacity: .6; }
.line {
  flex: 1; text-align: left; border: 0; background: transparent; color: var(--text);
  font: .85rem/2.1 "SF Mono", ui-monospace, Menlo, Consolas, monospace; white-space: pre; padding: 0 14px 0 4px; cursor: pointer; border-radius: 6px;
  transition: background .15s;
}
.line:hover { background: var(--accent-soft); }
.line.on { background: var(--accent-soft); box-shadow: inset 3px 0 0 var(--accent); }
#xray-note { position: sticky; top: 72px; }
.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-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 "SF Mono", ui-monospace, Menlo, Consolas, monospace; letter-spacing: 0; 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(--accent); }
.xray-paste-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 14px; margin-top: 12px; }
.xray-paste { scroll-margin-top: 72px; }
.xray[hidden] { display: none; }
#xray-error { margin: 12px 0 0; }
.xray-result-bar { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px 18px; }
.xray-result-bar .note { margin: 2px 0 0; }
.xray-result-title { margin: 0; font-weight: 600; font-size: 1.02rem; }
.xray-result-actions { display: flex; gap: 10px; }
#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-missing[open] summary { margin-bottom: 6px; }
/* On narrow screens the explanation opens under the line that was picked. */
.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; }
.xray-review { margin: 6px 0 0; padding-left: 20px; font-size: .9rem; color: var(--muted); }
.xray-review li { margin: 4px 0; }
.strong { font-weight: 600; margin-bottom: 0; }
.quiz-again { margin: -8px 0 20px; }
#xray-note pre { margin-bottom: 14px; white-space: pre-wrap; }

/* Pod doctor */
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 20px; }
.chip { font: inherit; font-size: .88rem; border: 1px solid var(--line); background: var(--surface); color: var(--text); padding: 8px 16px; border-radius: 99px; cursor: pointer; transition: border-color .2s, background .2s; }
.chip:hover { border-color: var(--accent); }
.chip[aria-pressed="true"] { border-color: var(--accent); background: var(--accent-soft); color: var(--accent); }
.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: 220px minmax(0, 1fr); align-items: start; 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; letter-spacing: -.01em; }
.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 { display: inline-flex; align-items: center; min-height: 34px; padding: 6px 14px; font-size: .84rem; line-height: 1.3; text-align: left; }
.doctor-group .chip[hidden] { display: none; }
#doctor-out { scroll-margin-top: 72px; }
/* No entry the search can stand behind: say so, calmly, above any related ones. */
.doctor-none { margin: 0 0 16px; padding: 16px 20px; background: var(--surface); border: 1px solid var(--hair); border-radius: var(--radius); }
.doctor-none[hidden] { display: none; }
.doctor-none h3 { margin: 0 0 4px; font-size: 1rem; font-weight: 600; letter-spacing: -.01em; }
.doctor-none p { margin: 0; }
.doctor-practise { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-top: 16px; }
.doctor-practise > span { margin-right: 4px; }
a.chip:hover { text-decoration: none; }

/* One Troubleshoot entry, in the app and on problems.html */
.problem { min-width: 0; scroll-margin-top: 72px; }
.problem h3 { margin: 0; min-width: 0; overflow-wrap: anywhere; font: 600 1.15rem "SF Mono", ui-monospace, Menlo, monospace; letter-spacing: 0; }
.problem h4 { margin: 20px 0 8px; font-size: .9rem; color: var(--muted); font-weight: 600; letter-spacing: -.01em; }
.problem p { margin: 0 0 8px; }
.problem ul, .problem ol { margin: 0; padding-left: 22px; }
.problem li + li { margin-top: 4px; }
.problem pre { max-width: 100%; white-space: pre; }
.problem pre.fix-error { white-space: pre-wrap; overflow-wrap: anywhere; }
.problem li { overflow-wrap: anywhere; }
.problem .doctor-practise { margin: 0 0 8px; }
/* Causes: each one a block with its own Check and Fix */
.problem ol.causes { list-style: none; padding: 0; margin: 0; counter-reset: cause; display: grid; gap: 12px; }
.problem li.cause { counter-increment: cause; position: relative; margin: 0; padding: 14px 16px 14px 48px; border: 1px solid var(--hair); border-radius: var(--radius-sm); background: var(--surface); min-width: 0; }
.problem li.cause::before { content: counter(cause); position: absolute; left: 16px; top: 14px; width: 22px; height: 22px; border-radius: 50%; background: var(--code-bg); color: var(--muted); font-size: .8rem; font-weight: 600; line-height: 22px; text-align: center; }
.problem li.cause + li.cause { margin-top: 0; }
.problem .cause-why { margin: 0 0 10px; }
.problem .cause-label { margin: 10px 0 6px; font-size: .78rem; font-weight: 600; color: var(--muted); }
.problem .cause-label-row { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.problem .cause-label-row .copy { padding: 2px 10px; font-size: .75rem; }
.problem pre.cause-check { font-size: .8rem; }
.problem .cause-fix { margin: 0; }
@media (max-width: 520px) {
  .problem li.cause { padding: 12px 12px 12px 40px; }
  .problem li.cause::before { left: 10px; top: 12px; }
}
.learn-it { margin-top: 24px; padding: 18px 20px; border-radius: var(--radius-sm); background: var(--accent-soft); border: 1px solid var(--hair); }
.problem .learn-it h4 { margin-top: 0; color: var(--text); }
.fix-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; margin-bottom: 4px; }

/* problems.html: every entry on one static page */
.problems h1 { font-size: clamp(2rem, 4.5vw, 3rem); font-weight: 700; margin: 48px 0 14px; }
.problems-toc { columns: 3 220px; column-gap: 32px; margin-bottom: 24px; font-size: .9rem; }
.problems-toc div { break-inside: avoid; margin-bottom: 18px; }
.problems-toc h2 { font-size: .9rem; margin: 0 0 6px; letter-spacing: -.01em; }
.problems-toc ul { margin: 0; padding-left: 18px; }
.problems section > h2 { font-size: 1.6rem; margin: 48px 0 16px; }
.problems .problem + .problem { margin-top: 16px; }
.problems + .foot .foot-base { border-top: 0; padding-top: 28px; }

/* 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: 3px; min-width: 0; }
.cheats code { background: none; padding: 0; overflow-wrap: anywhere; }
.cheats .muted { font-size: .86rem; }
.copy { font: inherit; font-size: .8rem; border: 1px solid var(--line); background: var(--surface); color: var(--accent); padding: 5px 12px; border-radius: 99px; cursor: pointer; flex: none; }
.copy:hover { border-color: var(--accent); }
.cheat-actions { display: flex; gap: 6px; flex: none; }
.cheat-actions > :first-child { min-width: 52px; text-align: center; }
.copy.lab { color: var(--muted); text-decoration: none; }
.copy.lab:hover { color: var(--text); border-color: var(--muted); }
.cheat-fill-box summary { cursor: pointer; font-size: .9rem; color: var(--accent); margin-bottom: 10px; width: fit-content; }
.cheat-tools { display: grid; gap: 14px; margin-bottom: 8px; }
.cheat-fill { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 10px; }
.fill { display: grid; gap: 4px; font-size: .78rem; color: var(--muted); }
.fill input {
  font: .84rem "SF Mono", ui-monospace, Menlo, Consolas, monospace; letter-spacing: 0; color: var(--text); background: var(--surface);
  border: 1px solid var(--line); border-radius: 10px; padding: 7px 10px; min-width: 0;
}
.fill input:focus { outline: none; border-color: var(--accent); }
.filled { color: var(--accent); font-weight: 600; }
.hole { color: var(--muted); }

.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 4px; font-size: .8rem; font-weight: 600; color: var(--text); letter-spacing: 0; }
.foot-col a { color: var(--muted); width: fit-content; transition: color var(--dur-fast) var(--ease); }
.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-base a { color: inherit; text-decoration: underline; text-underline-offset: 2px; }
.foot-base .foot-tm { margin-top: 4px; font-size: .74rem; }

@media (max-width: 1000px) {
  .stages { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}
@media (max-width: 860px) {
  .flow { grid-template-columns: repeat(4, minmax(0, 1fr)); row-gap: 4px; }
  .flow::before { display: none; }
  .start-grid { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 720px) {
  body { font-size: 16px; }
  .doors { grid-template-columns: 1fr; }
  .door-search { flex-direction: column; }
  .hero { padding: 48px 0 24px; }
  .flow { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .stages { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .level { grid-template-columns: auto 1fr; padding: 14px 16px; }
  .level .num { display: none; }
  .level .actions { grid-column: 2; }
  .level .cmd { display: none; }
  .xray { grid-template-columns: 1fr; }
  .cheat-fill { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  #xray-note { position: static; }
  .card { padding: 20px; }
}
/* "How to use this" guide on every page */
.guide { margin: 0 0 24px; background: var(--surface); border: 1px solid var(--hair); border-radius: var(--radius); box-shadow: var(--shadow); }
.guide summary {
  cursor: pointer; padding: 14px 20px; font-weight: 600; font-size: .95rem; color: var(--accent); list-style: none;
  display: flex; align-items: center; gap: 8px;
}
.guide summary::-webkit-details-marker { display: none; }
.guide summary::before { content: "›"; display: inline-block; transition: transform .2s var(--ease); font-size: 1.1rem; line-height: 1; }
.guide[open] summary::before { transform: rotate(90deg); }
.guide-body { padding: 0 20px 18px; font-size: .95rem; }
.guide-body > p { margin: 0 0 14px; max-width: 760px; }
.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; }
.guide li { margin: 5px 0; }
@media (max-width: 720px) {
  .guide-cols { grid-template-columns: 1fr; }
  .guide-body { padding: 0 16px 16px; }
}

/* Search button and command palette */
.kbd-btn {
  display: inline-flex; align-items: center; gap: 10px; font: inherit; font-size: .8rem; color: var(--muted);
  background: var(--code-bg); border: 1px solid transparent; border-radius: 99px; padding: 5px 6px 5px 14px; cursor: pointer;
  transition: border-color .2s;
}
.kbd-btn:hover { border-color: var(--line); }
kbd {
  font: 500 .72rem/1 "SF Mono", ui-monospace, Menlo, Consolas, monospace; letter-spacing: 0; color: var(--muted);
  background: var(--surface); border: 1px solid var(--line); border-radius: 6px; padding: 3px 6px;
}
.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), 0 2px 8px rgba(0, 0, 0, .06);
}
.palette::backdrop { background: rgba(0, 0, 0, .28); }
.palette[open] { animation: pal-in .18s var(--ease); }
@keyframes pal-in { from { opacity: 0; transform: translateY(-6px) scale(.99); } }
#palette-input {
  width: 100%; font: inherit; font-size: 1.1rem; color: var(--text); background: transparent;
  border: 0; border-bottom: 1px solid var(--hair); padding: 18px 20px; outline: 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(--accent); }
.pal-kind { color: var(--muted); font-size: .78rem; flex: none; }
#palette-list .pal-empty { color: var(--muted); cursor: default; }
.palette-foot { font-size: .76rem; margin: 0; padding: 10px 20px 14px; border-top: 1px solid var(--hair); }

/* Playground: a simulated terminal beside a live cluster map */
.playground { margin-top: 8px; }
.pg-head { display: flex; justify-content: space-between; align-items: flex-end; gap: 20px; flex-wrap: wrap; }
.pg-head .section-title { margin-top: 32px; }
.pg-meta { display: flex; align-items: center; gap: 8px; margin-bottom: 24px; }
.pg-goal {
  margin: 0; font-size: .9rem; font-weight: 500; padding: 8px 14px; border-radius: 99px;
  background: var(--surface); border: 1px solid var(--hair); color: var(--muted);
}
.pg-goal.done { background: var(--ok-soft); color: var(--ok); border-color: transparent; }
.pg-body { display: grid; grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr); gap: 16px; align-items: start; }
.pg-term {
  background: #0d1117; color: #e6edf3; border-radius: var(--radius); box-shadow: var(--shadow);
  display: flex; flex-direction: column; overflow: hidden; cursor: text;
  border: 1px solid var(--hair);
}
.pg-bar { display: flex; align-items: center; gap: 7px; padding: 12px 16px; border-bottom: 1px solid rgba(255, 255, 255, .07); }
.pg-bar span { width: 11px; height: 11px; border-radius: 50%; background: #3a3f47; }
.pg-bar em { margin-left: auto; font-style: normal; font-size: .76rem; color: #8b949e; }
.pg-out {
  overflow: auto; padding: 14px 18px 4px; height: 340px;
  font: 13px/1.6 "SF Mono", ui-monospace, Menlo, Consolas, monospace; letter-spacing: 0;
}
.pg-line { white-space: pre-wrap; word-break: break-word; min-height: 1.6em; }
.pg-line.row, .pg-line.head { white-space: pre; word-break: normal; }
.pg-line.dim, .pg-line.na { color: #8b949e; }
.pg-line.head { color: #8b949e; }
.pg-line.cmd { color: #79c0ff; }
.pg-line.warn { color: #ffa198; }
.pg-line.ok { color: #56d364; font-weight: 600; }
.pg-form { display: flex; align-items: center; gap: 10px; padding: 10px 18px 16px; font: 13px "SF Mono", ui-monospace, Menlo, Consolas, monospace; }
.pg-form span { color: #56d364; }
#pg-input {
  flex: 1; font: inherit; color: #e6edf3; background: transparent; border: 0; outline: none; padding: 4px 0; caret-color: #56d364;
}
#pg-input::placeholder { color: #484f58; }
.pg-term:focus-within { border-color: var(--accent); }
.pg-side { display: flex; flex-direction: column; gap: 12px; }
.pg-map { display: grid; gap: 10px; }
.pg-node {
  background: var(--surface); border: 1px solid var(--hair); border-radius: var(--radius-sm); padding: 12px 14px;
  display: flex; flex-wrap: wrap; gap: 6px; align-items: center;
}
.pg-node-name { width: 100%; font-size: .78rem; color: var(--muted); font-weight: 500; margin-bottom: 2px; }
.pg-pod {
  display: inline-flex; align-items: center; gap: 6px; font: .76rem/1 "SF Mono", ui-monospace, Menlo, Consolas, monospace; letter-spacing: 0;
  padding: 6px 9px 6px 6px; border-radius: 99px; background: var(--code-bg); transition: background .3s var(--ease);
}
.pg-dot { display: inline-grid; place-items: center; width: 16px; height: 16px; border-radius: 50%; font-size: .66rem; font-weight: 700; color: #fff; }
.pg-pod.ok .pg-dot { background: var(--ok); }
.pg-pod.bad { background: var(--bad-soft); color: var(--bad); }
.pg-pod.bad .pg-dot { background: var(--bad); }
.pg-pod.notready { background: var(--warn-soft); color: var(--warn-text); }
.pg-pod.notready .pg-dot { background: var(--warn); }
.pg-pod.wait .pg-dot { background: var(--muted); animation: pg-pulse 1s ease-in-out infinite; }
@keyframes pg-pulse { 50% { opacity: .35; } }
.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: 220px minmax(0, 1fr); align-items: start; gap: 8px 16px; padding: 12px 0; }
.pg-group + .pg-group { border-top: 1px solid var(--hair); }
/* As tall as one row of buttons, so the name lines up with the first row. */
.pg-group-name { display: flex; align-items: center; gap: 8px; min-height: 34px; font-size: .84rem; font-weight: 600; color: var(--text); letter-spacing: -.01em; }
.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: inherit; font-size: .84rem; display: inline-flex; align-items: center; gap: 6px; height: 34px; padding: 0 14px; border-radius: 99px; white-space: nowrap;
  border: 1px solid var(--line); background: var(--surface); color: var(--text); cursor: pointer; transition: border-color .2s, background .2s;
}
.pg-scn:hover { border-color: var(--accent); }
.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-pod { border: 0; color: inherit; cursor: pointer; }
.pg-pod:hover { box-shadow: 0 0 0 1px var(--line); }
.pg-pod.gone { opacity: .45; text-decoration: line-through; }
.pg-unscheduled { border-style: dashed; border-color: var(--line); background: transparent; }
.pg-svc {
  display: flex; flex-wrap: wrap; align-items: center; gap: 4px 12px; padding: 12px 14px; border-radius: var(--radius-sm);
  border: 1px solid var(--hair); background: var(--surface); font-size: .82rem;
}
.pg-svc-name { font-weight: 600; }
.pg-svc-sel { font-family: "SF Mono", ui-monospace, Menlo, Consolas, monospace; letter-spacing: 0; color: var(--muted); font-size: .76rem; }
.pg-svc-eps { margin-left: auto; font-weight: 500; }
.pg-svc.ok .pg-svc-eps { color: var(--ok); }
.pg-svc.bad .pg-svc-eps { color: var(--bad); }
.pg-try { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.pg-try .chip { font-family: "SF Mono", ui-monospace, Menlo, Consolas, monospace; font-size: .76rem; letter-spacing: 0; padding: 6px 12px; }
@media (prefers-color-scheme: dark) {
  .pg-term { background: #0d1117; border-color: rgba(255, 255, 255, .12); }
  .pg-dot { color: #000; }
  .palette { box-shadow: 0 24px 64px rgba(0, 0, 0, .6); }
  .palette::backdrop { background: rgba(0, 0, 0, .55); }
}
@media (max-width: 860px) {
  .doctor-group { grid-template-columns: 1fr; }
  .doctor-group-name { min-height: 0; }
  .pg-body { grid-template-columns: 1fr; }
  .pg-group { grid-template-columns: 1fr; gap: 8px; }
  .pg-group-name { min-height: 0; }
  .pg-out { height: 280px; }
  .pg-term { min-height: 0; }
}
@media (max-width: 720px) {
  .kbd-btn span { display: none; }
  .kbd-btn { padding: 5px; }
  .pg-meta { margin-bottom: 16px; }
  .pg-out, .pg-form { font-size: 12px; padding-left: 14px; padding-right: 14px; }
  .pg-scenarios { display: flex; flex-wrap: nowrap; align-items: center; gap: 8px; overflow-x: auto; scrollbar-width: none; margin: 0 -22px 14px; padding: 2px 22px; scroll-snap-type: x proximity; background: none; border: 0; border-radius: 0; box-shadow: none; }
  .pg-group, .pg-group-items { display: contents; }
  .pg-group-name { flex: none; align-self: center; min-height: 0; padding: 0 0 0 12px; margin-left: 4px; border-left: 1px solid var(--line); }
  .pg-group:first-child .pg-group-name { border-left: 0; padding-left: 0; }
  .pg-scenarios::-webkit-scrollbar { display: none; }
  .pg-scn { flex: none; scroll-snap-align: start; }
}

/* Motion: one easing, two durations, and only where it says what changed. */
@keyframes kq-in { from { opacity: 0; transform: translateY(6px); } }
@keyframes kq-pod-in { from { opacity: 0; transform: scale(.9); } }
@keyframes kq-pop { 0% { opacity: 0; transform: scale(.4); } 60% { transform: scale(1.25); } 100% { opacity: 1; transform: none; } }
@keyframes kq-bump { 50% { transform: scale(1.2); } }
@keyframes kq-nudge { 50% { transform: scale(1.015); } }
@keyframes kq-shake { 20%, 60% { transform: translateX(-5px); } 40%, 80% { transform: translateX(5px); } }
@keyframes kq-heal { from { box-shadow: 0 0 0 0 color-mix(in srgb, var(--ok) 55%, transparent); } to { box-shadow: 0 0 0 10px transparent; } }
.tab.tab-in { animation: kq-in var(--dur) var(--ease) both; }
.pg-pod.is-new { animation: kq-pod-in .32s var(--ease) both; }
.pg-pod.is-healed { animation: kq-heal .9s var(--ease); }
.pg-pod.is-healed .pg-dot { animation: kq-pop .45s var(--ease) both; }
.pg-goal.done { animation: kq-in var(--dur) var(--ease); }
.pg-scn.just-solved .pg-scn-done { display: inline-block; animation: kq-pop .5s var(--ease) both; }
.pg-group-count.bump { display: inline-block; animation: kq-bump .4s var(--ease) .1s; }
.opt.right { animation: kq-nudge .3s var(--ease); }
.opt.wrong { animation: kq-shake .36s var(--ease); }
.feedback.ok, .feedback.bad { animation: kq-in var(--dur) var(--ease) both; }
.copy, .chip, .pg-scn, .pg-pod { transition: border-color var(--dur-fast) var(--ease), background var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease); }
.copy:active, .chip:active, .pg-scn:active, .pg-pod:active, .kbd-btn:active { transform: scale(.96); }
.score, .pg-group-count, .doctor-group-count, .arch-step { font-variant-numeric: tabular-nums; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; }
}


.link-btn { font: inherit; color: var(--accent); background: none; border: 0; padding: 0; cursor: pointer; }
.link-btn:hover { text-decoration: underline; }

/* Architecture: a diagram whose components explain themselves. */
:root { --arch-cp: color-mix(in srgb, var(--accent) 8%, transparent); }
.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(--line); stroke-width: 1; }
.arch-panel.arch-cp { fill: var(--arch-cp); stroke: none; }
.arch-panel.arch-addon { stroke-dasharray: 5 4; }
.arch-panel-label { fill: var(--muted); font-size: 12px; font-weight: 600; }
.arch-edge { fill: none; stroke: var(--line); stroke-width: 1.5; transition: stroke .15s, opacity .15s; }
.arch-edge.is-on { stroke: var(--accent); stroke-width: 2; stroke-dasharray: 6 5; animation: arch-flow .9s linear infinite; }
@keyframes arch-flow { to { stroke-dashoffset: -11; } }
.arch-dot { fill: var(--accent); stroke: var(--surface); stroke-width: 2; opacity: 0; transition: opacity .2s; }
.arch-dot.is-on { opacity: 1; }
.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(--accent); font-size: .78rem; font-weight: 600; }
.arch-svg.is-entering .arch-panel, .arch-svg.is-entering .arch-panel-label { animation: arch-fade .5s var(--ease) both; }
.arch-svg.is-entering .arch-box { animation: arch-rise .5s var(--ease) both; }
.arch-svg.is-entering .arch-edge { animation: arch-fade .6s var(--ease) .7s both; }
@keyframes arch-fade { from { opacity: 0; } }
@keyframes arch-rise { from { opacity: 0; transform: translateY(6px); } }
#arch-arrow path { fill: var(--line); }
#arch-arrow-on path { fill: var(--accent); }
.arch-box { cursor: pointer; outline: none; transition: opacity .15s; }
.arch-box rect { fill: var(--surface); stroke: var(--line); stroke-width: 1; transition: fill .15s, stroke .15s; }
.arch-box.arch-cp rect { stroke: var(--k8s); }
.arch-box.arch-addon rect { stroke-dasharray: 4 3; }
.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(--accent); stroke-width: 2; filter: drop-shadow(0 4px 10px color-mix(in srgb, var(--accent) 18%, transparent)); }
.arch-box.is-near rect { stroke: var(--accent); }
.arch-box:focus-visible rect { stroke: var(--accent); stroke-width: 3; }
.has-focus .arch-box:not(.is-on):not(.is-near) { opacity: .4; }
.has-focus .arch-edge:not(.is-on) { opacity: .4; }
.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; transform: translateY(4px); transition: opacity .16s var(--ease), transform .16s var(--ease), visibility .16s; }
.arch-tip.is-shown { opacity: 1; visibility: visible; transform: none; }
.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-tip p:last-child { margin: 0; }
.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); font-weight: 600; }
.arch-detail p, .arch-detail ul { margin: 0; font-size: .92rem; line-height: 1.5; }
.arch-detail ul { padding-left: 18px; }
.arch-detail pre { margin: 6px 0 0; font-size: .8rem; white-space: pre-wrap; word-break: break-word; }
.arch-detail .doctor-practise { margin-top: 14px; }
.arch-where { color: var(--accent); font-size: .78rem; font-weight: 600; }
.arch-detail .arch-where { margin: 0 0 2px; }
@media (max-width: 720px) {
  .foot-grid { grid-template-columns: 1fr 1fr; gap: 28px; padding-top: 36px; }
  .foot-brand { grid-column: 1 / -1; }
  .cheats li { flex-direction: column; align-items: stretch; gap: 10px; }
  .cheats code { overflow-wrap: break-word; }
  .arch-figure { padding: 12px; }
}
@media (prefers-reduced-motion: reduce) {
  .arch-edge, .arch-box, .arch-box rect, .arch-tip, .arch-dot { transition: none; }
  .arch-edge.is-on { animation: none; stroke-dasharray: none; }
}

/* Learning loop: continue, on-call shift, score, skill radar and learning uptime. */
.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(--accent) !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 { background: none; border: 0; color: var(--accent); 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(--accent); }
.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(--accent) 22%, transparent); stroke: var(--accent); stroke-width: 2; stroke-linejoin: round; }
.eng-r-dot { fill: var(--accent); }
.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; }
@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(--accent); font-weight: 600; padding-left: 8px; border-left: 1px solid var(--line); }
.eyebrow { display: inline-flex; align-items: center; gap: 8px; }

.eng-msg { margin: 0; font-size: .9rem; color: var(--muted); }
.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(--accent); 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-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(--accent); }
.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 .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; }
/* problems.html has no search button: keep the switch centred. */
.top-inner:not(:has(.kbd-btn)) .brand, .top-inner:not(:has(.kbd-btn))::after { flex: 1 1 0; }
.top-inner:not(:has(.kbd-btn))::after { content: ""; }

/* 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(--accent); 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; } }

/* The playground loads just after the first screen: keep its room so nothing below it moves. */
.pg-scenarios:empty { min-height: 985px; }
.pg-map:empty { min-height: 261px; }
.pg-try:empty { min-height: 72px; }
@media (max-width: 1199px) { .pg-scenarios:empty { min-height: 1069px; } .pg-head:has(.pg-goal:empty) { min-height: 212px; } }
@media (max-width: 999px) { .pg-scenarios:empty { min-height: 1321px; } }
@media (max-width: 860px) { .pg-scenarios:empty { min-height: 1216px; } .pg-try:empty { min-height: 32px; } .pg-head:has(.pg-goal:empty) { min-height: 204px; } }
@media (max-width: 720px) { .pg-scenarios:empty { min-height: 38px; } }
@media (max-width: 599px) { .pg-try:empty { min-height: 72px; } .pg-head:has(.pg-goal:empty) { min-height: 251px; } }

/* While a feature's code is still arriving, its space shows calm grey lines in the shape it will
   fill, and the first screen fades in once as one piece. Both stop for reduced motion. */
.pg-scenarios:empty, .pg-map:empty, .pg-try:empty, main:has(.pg-scenarios:empty) #pg-out:empty, #arch:empty, #quiz-list:empty {
  border-radius: var(--radius-sm);
  background: repeating-linear-gradient(to bottom, var(--code-bg) 0 12px, transparent 12px 28px) 0 0 / 100% 100% no-repeat;
  animation: nimbus-skel 1.6s ease-in-out infinite alternate;
}
main: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%; }
#quiz-list:empty { min-height: 320px; }
#arch:empty { min-height: 597px; border: 1px solid var(--hair); background: var(--surface) linear-gradient(var(--code-bg), var(--code-bg)) 50% 50% / calc(100% - 56px) calc(100% - 56px) no-repeat; }
#pg-goal:empty { width: min(250px, 60vw); height: 39px; border-color: transparent; background: var(--code-bg); animation: nimbus-skel 1.6s ease-in-out infinite alternate; }
@media (max-width: 720px) {
  .pg-scenarios:empty { background: var(--code-bg); border-radius: 99px; }
  #arch:empty { min-height: 899px; }
}
@keyframes nimbus-skel { from { opacity: .5; } to { opacity: 1; } }
#engage:not(:empty), #stages: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-map:empty, .pg-try:empty, main:has(.pg-scenarios:empty) #pg-out:empty, #arch:empty, #quiz-list:empty, #pg-goal:empty { animation: none; }
  #engage:not(:empty), #stages:not(:empty), #levels:not(:empty) { animation: 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; } }

/* 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: #2997ff; }
.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: #1c91ff; }
@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; } }