/* ZyeemZia certification engine — site styles. Colours and faces come from theme.css (per track). */
* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 16px/1.65 var(--f-body); }
a { color: var(--accent); }
button { font: inherit; color: inherit; }
:focus-visible { outline: 3px solid var(--accent-2); outline-offset: 2px; border-radius: 6px; }
h1, h2, h3, h4 { margin: 0; line-height: 1.2; text-wrap: balance; font-family: var(--f-display); letter-spacing: -.01em; }
p { margin: 0; }
code { font: .9em var(--f-mono); background: var(--surface-2); padding: 1px 6px; border-radius: 5px; }
.muted { color: var(--ink-2); }
.eyebrow { font: 600 .72rem/1.2 var(--f-mono); letter-spacing: .14em; text-transform: uppercase; color: var(--accent); }

/* ---------- chrome ---------- */
.topbar { position: sticky; top: 0; padding-top: env(safe-area-inset-top, 0px); z-index: 30; background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: blur(10px) saturate(1.3); -webkit-backdrop-filter: blur(10px) saturate(1.3); border-bottom: 1px solid var(--line); }
.topbar-in { max-width: 1160px; margin: 0 auto; display: flex; align-items: center; gap: 16px; padding-block: 10px; padding-left: max(16px, env(safe-area-inset-left, 0px)); padding-right: max(16px, env(safe-area-inset-right, 0px)); }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink); flex-shrink: 0; }
.brand-mark { height: 38px; padding: 0 10px; display: grid; place-items: center; background: var(--ink); color: var(--bg); font: 800 .95rem var(--f-display); letter-spacing: .04em; border-radius: 9px; }
.brand-mark i { font-style: normal; color: var(--accent); }
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-text b { font: 700 .92rem var(--f-display); }
.brand-text small { font: 500 .7rem var(--f-mono); color: var(--ink-2); letter-spacing: .04em; }
.mainnav { display: flex; gap: 2px; margin-left: 8px; }
.mainnav a { text-decoration: none; color: var(--ink-2); padding: 7px 10px; border-radius: 9px; font-weight: 500; font-size: .93rem; white-space: nowrap; display: inline-flex; gap: 6px; align-items: center; }
.mainnav a:hover { background: var(--surface-2); color: var(--ink); }
.mainnav a[aria-current="page"] { color: var(--accent); background: var(--accent-soft); }
.mainnav svg { width: 16px; height: 16px; }
.top-tools { margin-left: auto; display: flex; gap: 8px; align-items: center; }
.icon-btn { width: 36px; height: 36px; border-radius: 50%; border: 1px solid var(--line); background: var(--surface); display: grid; place-items: center; cursor: pointer; color: var(--ink-2); }
.icon-btn svg, .btn svg, .tabbar svg { width: 18px; height: 18px; }
.prog-chip { display: inline-flex; align-items: center; gap: 8px; text-decoration: none; color: var(--ink); font: 600 .82rem var(--f-mono); background: var(--surface); border: 1px solid var(--line); padding: 6px 12px; border-radius: 999px; font-variant-numeric: tabular-nums; white-space: nowrap; }
.prog-chip i { width: 46px; height: 6px; border-radius: 9px; background: var(--surface-2); overflow: hidden; display: inline-block; }
.prog-chip i b { display: block; height: 100%; background: var(--accent); }
.read-bar { height: 3px; width: 0; background: var(--accent); transition: width .15s; }
.tabbar { display: none; }
.view { max-width: 1160px; margin: 0 auto; outline: none; padding-block: 28px 56px; padding-left: max(16px, env(safe-area-inset-left, 0px)); padding-right: max(16px, env(safe-area-inset-right, 0px)); }
.site-foot { max-width: 1160px; margin: 0 auto; padding-block: 22px 28px; padding-left: max(16px, env(safe-area-inset-left, 0px)); padding-right: max(16px, env(safe-area-inset-right, 0px)); border-top: 1px solid var(--line); color: var(--ink-3); font-size: .82rem; display: grid; gap: 8px; }
.site-foot .row { display: flex; gap: 8px 18px; flex-wrap: wrap; justify-content: space-between; }
.site-foot a { color: var(--ink-2); text-decoration: none; font-weight: 600; }
.site-foot .disc { font-size: .76rem; max-width: 90ch; }

/* ---------- common ---------- */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; border: 1px solid var(--line); background: var(--surface); color: var(--ink); padding: 10px 16px; border-radius: 11px; cursor: pointer; font-weight: 600; text-decoration: none; font-size: .95rem; line-height: 1.25; }
.btn:hover { border-color: var(--ink-3); }
.btn-primary { background: var(--accent); color: var(--accent-ink); border-color: transparent; }
.btn-primary:hover { filter: brightness(1.07); border-color: transparent; }
.btn-dark { background: var(--ink); color: var(--bg); border-color: transparent; }
.btn-ghost { background: none; border-color: transparent; color: var(--ink-2); }
.btn-sm { padding: 6px 11px; font-size: .85rem; border-radius: 9px; }
.btn[disabled] { opacity: .45; cursor: not-allowed; }
.chip { display: inline-flex; align-items: center; gap: 5px; padding: 3px 10px; border-radius: 999px; font: 600 .76rem var(--f-mono); background: var(--surface-2); color: var(--ink-2); white-space: nowrap; }
.chip.ok { background: var(--good-soft); color: var(--good); }
.chip.acc { background: var(--accent-soft); color: var(--accent); }
.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); }
.page-head { display: grid; gap: 6px; margin-bottom: 22px; }
.page-title { font-size: clamp(1.7rem, 3.4vw, 2.4rem); }
.section-title { font-size: 1.3rem; margin: 36px 0 14px; display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap; }
.section-title small { font: 500 .8rem var(--f-mono); color: var(--ink-3); }
.bar { height: 6px; border-radius: 9px; background: var(--surface-2); overflow: hidden; }
.bar > i { display: block; height: 100%; background: var(--accent); }
.empty { text-align: center; padding: 48px 20px; color: var(--ink-2); border: 1px dashed var(--line); border-radius: 18px; }

/* ---------- home ---------- */
.hero { position: relative; overflow: hidden; display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr); gap: 28px; align-items: center; padding: 34px; border-radius: 24px; background: var(--hero-bg); color: var(--hero-ink); }
.hero .motif { position: absolute; inset: 0; pointer-events: none; opacity: .5; background: var(--motif); }
.hero > *:not(.motif) { position: relative; min-width: 0; }
.hero .eyebrow { color: var(--hero-accent); }
.hero h1 { font-size: clamp(2rem, 4.6vw, 3.3rem); font-weight: 800; margin: 10px 0 6px; color: var(--hero-ink); }
.hero h1 span { color: var(--hero-accent); }
.hero .tag { font: 600 1.05rem var(--f-display); color: var(--hero-accent); }
.hero .lead { color: var(--hero-ink-2); max-width: 58ch; margin-top: 12px; }
.hero-actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 20px; }
.hero .btn:not(.btn-primary) { background: transparent; color: var(--hero-ink); border-color: color-mix(in srgb, var(--hero-ink) 35%, transparent); }
.hero-stats { display: flex; gap: 22px; flex-wrap: wrap; margin-top: 24px; }
.hero-stats div { display: grid; }
.hero-stats b { font: 800 1.5rem var(--f-display); color: var(--hero-ink); font-variant-numeric: tabular-nums; }
.hero-stats span { font: 500 .74rem var(--f-mono); color: var(--hero-ink-2); text-transform: uppercase; letter-spacing: .08em; }
.hero-sig { display: grid; justify-items: center; gap: 8px; }
.hero-sig .sg { width: 100%; max-width: 360px; height: auto; }
.hero-sig figcaption { font: 500 .78rem var(--f-mono); color: var(--hero-ink-2); text-align: center; }

.path { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; margin-top: 18px; }
.path-step { padding: 16px; border-radius: 16px; background: var(--surface); border: 1px solid var(--line); display: grid; gap: 6px; position: relative; }
.path-step .n { font: 700 .74rem var(--f-mono); color: var(--ink-3); }
.path-step b { font: 700 1.02rem var(--f-display); }
.path-step small { color: var(--ink-2); font-size: .85rem; }
.path-step.done { border-color: var(--good); }
.path-step.done .n { color: var(--good); }
.path-step.now { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }

.mod-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; }
.mod-card { display: grid; gap: 8px; padding: 16px; border-radius: 16px; background: var(--surface); border: 1px solid var(--line); text-decoration: none; color: var(--ink); transition: transform .15s, border-color .15s; min-width: 0; }
.mod-card:hover { transform: translateY(-2px); border-color: var(--accent); }
.mod-top { display: flex; justify-content: space-between; align-items: center; }
.mod-num { font: 800 1.6rem/1 var(--f-display); color: var(--accent); }
.mod-card h3 { font-size: 1.02rem; }
.mod-card p { font-size: .86rem; color: var(--ink-2); }
.mod-card .meta { display: flex; justify-content: space-between; font: 500 .74rem var(--f-mono); color: var(--ink-3); }
.book-banner { display: grid; grid-template-columns: 180px minmax(0, 1fr); gap: 24px; align-items: center; padding: 20px; border-radius: 20px; background: var(--accent-soft); border: 1px solid var(--line); margin-top: 18px; }
.bb-cover { aspect-ratio: 3/4; border-radius: 5px 12px 12px 5px; background: var(--hero-bg); color: var(--hero-ink); padding: 14px; display: flex; flex-direction: column; justify-content: space-between; text-decoration: none; box-shadow: inset 7px 0 0 rgba(0,0,0,.25), 0 12px 26px -12px rgba(0,0,0,.5); position: relative; overflow: hidden; transition: transform .2s; }
.bb-cover:hover { transform: rotate(-2deg) translateY(-3px); }
.bb-cover .motif { position: absolute; inset: 0; background: var(--motif); opacity: .5; }
.bb-cover > *:not(.motif) { position: relative; }
.bb-cover b { font: 800 1.9rem/1 var(--f-display); color: var(--hero-accent); }
.bb-cover span { font: 600 .82rem/1.3 var(--f-display); }
.bb-cover small { font: 500 .62rem var(--f-mono); opacity: .8; }
.bb-text { display: grid; gap: 8px; min-width: 0; }
.bb-text h2 { font-size: 1.35rem; }
.two { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 14px; }
.list-card { padding: 18px; display: grid; gap: 10px; }
.list-card ul { margin: 0; padding-left: 18px; display: grid; gap: 4px; }

/* ---------- module & lesson ---------- */
.crumbs { display: flex; gap: 8px; align-items: center; font-size: .85rem; color: var(--ink-2); flex-wrap: wrap; }
.crumbs a { color: var(--ink-2); text-decoration: none; }
.mod-hero { padding: 26px; border-radius: 20px; background: var(--surface); border: 1px solid var(--line); display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 22px; margin: 14px 0 22px; align-items: start; }
.mod-big { font: 800 4rem/1 var(--f-display); color: var(--accent); }
.outcomes { margin: 12px 0 0; padding: 0; list-style: none; display: grid; gap: 6px; }
.outcomes li { display: flex; gap: 10px; }
.outcomes li::before { content: ""; width: 8px; height: 8px; margin-top: .6em; flex-shrink: 0; background: var(--accent); border-radius: 2px; }
.lesson-list { display: grid; gap: 10px; }
.lesson-row { display: grid; grid-template-columns: 54px minmax(0, 1fr) auto; gap: 14px; align-items: center; padding: 14px 16px; border-radius: 14px; background: var(--surface); border: 1px solid var(--line); text-decoration: none; color: var(--ink); }
.lesson-row:hover { border-color: var(--accent); }
.lesson-row .ln { font: 700 1.15rem var(--f-mono); color: var(--ink-3); text-align: center; }
.lesson-row.done .ln { color: var(--good); }
.lesson-row b { font-family: var(--f-display); }
.lesson-row small { display: block; color: var(--ink-2); }
.lesson { max-width: 840px; margin: 0 auto; }
.lesson-head { margin: 14px 0 22px; padding: 24px; border-radius: 20px; background: var(--surface); border: 1px solid var(--line); border-top: 5px solid var(--accent); }
.lesson-head h1 { font-size: clamp(1.5rem, 3.2vw, 2.1rem); margin: 6px 0; }
.objectives { margin: 12px 0 0; padding: 12px 14px; list-style: none; display: grid; gap: 6px; background: var(--surface-2); border-radius: 12px; font-size: .95rem; }
.objectives li::before { content: "→ "; color: var(--accent); font-weight: 700; }
.blocks { display: grid; gap: 18px; }
.blk-title { font-size: 1.12rem; margin-bottom: 8px; }
.b-text { font-size: 1.04rem; }
.callout { padding: 14px 16px; border-radius: 14px; border-left: 4px solid var(--c); background: color-mix(in srgb, var(--c) 9%, var(--surface)); }
.callout .ct { font: 700 .72rem var(--f-mono); letter-spacing: .12em; text-transform: uppercase; color: var(--c); display: block; margin-bottom: 4px; }
.callout b.h { display: block; font-family: var(--f-display); margin-bottom: 2px; }
.callout.insight { --c: var(--accent-2); } .callout.warning { --c: var(--bad); } .callout.example { --c: var(--good); } .callout.pro { --c: var(--accent); } .callout.definition { --c: var(--ink-2); }
.keypoints { padding: 16px 18px; border-radius: 14px; background: var(--surface); border: 1px solid var(--line); }
.keypoints ul { margin: 0; padding: 0; list-style: none; display: grid; gap: 8px; }
.keypoints li { display: grid; grid-template-columns: 22px minmax(0, 1fr); }
.keypoints li::before { content: "✓"; color: var(--accent); font-weight: 800; }
.tbl { overflow-x: auto; border: 1px solid var(--line); border-radius: 14px; background: var(--surface); }
table { width: 100%; border-collapse: collapse; font-size: .93rem; }
th, td { text-align: left; padding: 9px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { background: var(--surface-2); font: 600 .78rem var(--f-mono); letter-spacing: .04em; color: var(--ink-2); text-transform: uppercase; }
tr:last-child td { border-bottom: 0; }
.steps { margin: 0; padding: 0; list-style: none; counter-reset: st; display: grid; gap: 10px; }
.steps li { counter-increment: st; display: grid; grid-template-columns: 38px minmax(0, 1fr); gap: 12px; padding: 12px 14px; border-radius: 14px; background: var(--surface); border: 1px solid var(--line); }
.steps li::before { content: counter(st, decimal-leading-zero); font: 700 .95rem var(--f-mono); color: var(--accent); padding-top: 2px; }
.steps b { font-family: var(--f-display); display: block; }
.fw { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 10px; }
.fw-card { padding: 14px; border-radius: 14px; background: var(--surface); border: 1px solid var(--line); display: grid; gap: 4px; align-content: start; }
.fw-card .lab { font: 800 .82rem var(--f-mono); color: var(--accent-ink); background: var(--accent); justify-self: start; padding: 2px 8px; border-radius: 6px; }
.fw-card b { font-family: var(--f-display); }
.fw-card p { font-size: .9rem; color: var(--ink-2); }
.cmp { display: grid; grid-template-columns: repeat(var(--n), minmax(0, 1fr)); gap: 10px; }
.cmp-col { padding: 14px; border-radius: 14px; background: var(--surface); border: 1px solid var(--line); }
.cmp-col h4 { font-size: 1rem; padding-bottom: 8px; margin-bottom: 8px; border-bottom: 2px solid var(--accent); }
.cmp-col ul { margin: 0; padding-left: 18px; display: grid; gap: 4px; font-size: .92rem; }
.flow { display: flex; gap: 0; overflow-x: auto; padding: 4px 2px 8px; }
.flow-i { flex: 1 1 0; min-width: 130px; padding: 12px; background: var(--surface); border: 1px solid var(--line); border-radius: 12px; position: relative; display: grid; gap: 4px; align-content: start; }
.flow-i + .flow-i { margin-left: 22px; }
.flow-i + .flow-i::before { content: ""; position: absolute; left: -19px; top: 50%; width: 16px; height: 2px; background: var(--accent); }
.flow-i + .flow-i::after { content: ""; position: absolute; left: -7px; top: calc(50% - 4px); border: 5px solid transparent; border-left-color: var(--accent); }
.flow-i b { font: 700 .92rem var(--f-display); }
.flow-i span { font-size: .82rem; color: var(--ink-2); }
.flow-i .k { font: 700 .7rem var(--f-mono); color: var(--accent); }
.layers { display: grid; gap: 6px; }
.layer { display: grid; grid-template-columns: 170px minmax(0, 1fr); border-radius: 12px; overflow: hidden; border: 1px solid var(--line); background: var(--surface); }
.layer > b { background: color-mix(in srgb, var(--accent) calc(var(--d) * 1%), var(--surface)); color: var(--ink); padding: 10px 12px; font: 700 .88rem var(--f-display); display: flex; align-items: center; }
.layer .parts { display: flex; flex-wrap: wrap; gap: 6px; padding: 8px 10px; align-items: center; }
.layer .parts span { font: 500 .8rem var(--f-mono); padding: 3px 9px; border-radius: 7px; background: var(--surface-2); border: 1px solid var(--line); }
.formula { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 10px; }
.fm { padding: 14px; border-radius: 14px; background: var(--surface); border: 1px solid var(--line); display: grid; gap: 4px; }
.fm small { font: 600 .72rem var(--f-mono); color: var(--ink-3); text-transform: uppercase; letter-spacing: .08em; }
.fm code { font-size: 1rem; background: var(--accent-soft); color: var(--ink); padding: 6px 10px; justify-self: start; max-width: 100%; overflow-wrap: anywhere; white-space: normal; }
.fm p { font-size: .88rem; color: var(--ink-2); }
.case { border-radius: 16px; border: 1px solid var(--line); background: var(--surface); overflow: hidden; }
.case-h { padding: 12px 16px; background: var(--ink); color: var(--bg); display: flex; gap: 10px; align-items: center; }
.case-h b { font-family: var(--f-display); }
.case-b { padding: 16px; display: grid; gap: 10px; }
.case-b ol { margin: 0; padding-left: 20px; display: grid; gap: 4px; }
.reveal { border-top: 1px dashed var(--line); padding-top: 10px; }
.scenario { border-radius: 16px; border: 2px solid var(--accent-2); background: var(--surface); padding: 16px; display: grid; gap: 12px; }
.sc-opts { display: grid; gap: 8px; }
.sc-opt { text-align: left; border: 1.5px solid var(--line); background: var(--bg); border-radius: 12px; padding: 11px 14px; cursor: pointer; display: grid; gap: 4px; }
.sc-opt:hover:not([disabled]) { border-color: var(--accent-2); }
.sc-opt .fb { font-size: .88rem; color: var(--ink-2); }
.sc-opt.best { border-color: var(--good); background: var(--good-soft); }
.sc-opt.weak { border-color: var(--bad); background: var(--bad-soft); }
.sc-opt[disabled] { cursor: default; }
.checklist { padding: 16px; border-radius: 16px; background: var(--surface); border: 1px solid var(--line); display: grid; gap: 8px; }
.ck { display: flex; gap: 10px; align-items: flex-start; cursor: pointer; }
.ck input { width: 19px; height: 19px; margin-top: 3px; accent-color: var(--accent); flex-shrink: 0; }
.template { border-radius: 16px; border: 1px solid var(--line); background: var(--surface); overflow: hidden; }
.tp-h { padding: 12px 16px; display: flex; justify-content: space-between; gap: 10px; align-items: center; flex-wrap: wrap; background: var(--accent-soft); }
.tp-h b { font-family: var(--f-display); }
.template .tbl { border: 0; border-radius: 0; }
.template td[contenteditable] { background: var(--bg); min-width: 90px; }
.template td[contenteditable]:focus { outline: 2px solid var(--accent); outline-offset: -2px; }
.template tr.ex td { color: var(--ink-2); font-style: italic; }
.reflection { padding: 16px; border-radius: 16px; background: var(--surface); border: 1px dashed var(--ink-3); display: grid; gap: 8px; }
.reflection textarea { width: 100%; min-height: 96px; border-radius: 10px; border: 1px solid var(--line); background: var(--bg); color: var(--ink); padding: 10px; font: inherit; resize: vertical; }
.terms { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 8px; }
.term { padding: 12px 14px; border-radius: 12px; background: var(--surface); border: 1px solid var(--line); }
.term b { font-family: var(--f-display); display: block; color: var(--accent); }
.term span { font-size: .9rem; color: var(--ink-2); }
.quiz { border-radius: 18px; border: 2px solid var(--accent); background: var(--surface); padding: 18px; display: grid; gap: 14px; }
.quiz-top { display: flex; justify-content: space-between; align-items: center; gap: 10px; flex-wrap: wrap; }
.dots { display: flex; gap: 5px; flex-wrap: wrap; }
.dots i { width: 10px; height: 10px; border-radius: 50%; background: var(--surface-2); }
.dots i.ok { background: var(--good); } .dots i.no { background: var(--bad); } .dots i.cur { outline: 2px solid var(--accent); outline-offset: 1px; }
.q-text { font-size: 1.08rem; font-weight: 600; }
.opts { display: grid; gap: 8px; }
.opt { text-align: left; border: 1.5px solid var(--line); background: var(--bg); border-radius: 12px; padding: 11px 14px; cursor: pointer; display: grid; grid-template-columns: 28px minmax(0, 1fr); gap: 10px; align-items: start; }
.opt:hover:not([disabled]) { border-color: var(--accent); }
.opt .k { width: 26px; height: 26px; border-radius: 50%; background: var(--surface-2); display: grid; place-items: center; font: 700 .78rem var(--f-mono); }
.opt.ok { border-color: var(--good); background: var(--good-soft); } .opt.ok .k { background: var(--good); color: var(--on-status, #fff); }
.opt.no { border-color: var(--bad); background: var(--bad-soft); } .opt.no .k { background: var(--bad); color: var(--on-status, #fff); }
.opt.sel { border-color: var(--accent); background: var(--accent-soft); } .opt.sel .k { background: var(--accent); color: var(--accent-ink); }
.opt[disabled] { cursor: default; }
.explain { font-size: .93rem; padding: 10px 12px; border-radius: 10px; background: var(--surface-2); }
.q-foot { display: flex; justify-content: flex-end; gap: 8px; flex-wrap: wrap; }
.q-result { text-align: center; display: grid; gap: 8px; justify-items: center; padding: 8px 0; }
.big-num { font: 800 3rem/1 var(--f-display); color: var(--accent); font-variant-numeric: tabular-nums; }
.lesson-foot { margin-top: 28px; padding-top: 20px; border-top: 1px solid var(--line); display: flex; justify-content: space-between; gap: 10px; flex-wrap: wrap; align-items: center; }
.done-banner { display: inline-flex; gap: 8px; align-items: center; padding: 10px 14px; border-radius: 12px; background: var(--good-soft); color: var(--good); font-weight: 700; }

/* ---------- exam ---------- */
.exam-wrap { max-width: 860px; margin: 0 auto; display: grid; gap: 16px; }
.exam-bar { position: sticky; top: calc(env(safe-area-inset-top, 0px) + 62px); z-index: 5; display: flex; justify-content: space-between; align-items: center; gap: 10px; flex-wrap: wrap; padding: 10px 14px; border-radius: 14px; background: var(--surface); border: 1px solid var(--line); font: 600 .9rem var(--f-mono); }
.timer.low { color: var(--bad); }
.qmap { display: grid; grid-template-columns: repeat(auto-fill, minmax(34px, 1fr)); gap: 5px; }
.qmap button { height: 32px; border-radius: 8px; border: 1px solid var(--line); background: var(--bg); cursor: pointer; font: 600 .78rem var(--f-mono); }
.qmap button.ans { background: var(--accent-soft); border-color: var(--accent); }
.qmap button.flag { box-shadow: inset 0 -3px 0 var(--warn); }
.qmap button.cur { outline: 2px solid var(--ink); }
.qmap button.ok { background: var(--good-soft); border-color: var(--good); } .qmap button.no { background: var(--bad-soft); border-color: var(--bad); }
.rules { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 10px; }
.rules div { padding: 14px; border-radius: 14px; background: var(--surface); border: 1px solid var(--line); }
.rules b { display: block; font: 800 1.5rem var(--f-display); color: var(--accent); }
.rules span { font-size: .85rem; color: var(--ink-2); }
.breakdown { display: grid; gap: 8px; }
.bd-row { display: grid; grid-template-columns: 140px minmax(0, 1fr) 60px; gap: 10px; align-items: center; font-size: .9rem; }
.bd-row .bar > i { background: var(--accent-2); }
.verdict { padding: 22px; border-radius: 20px; text-align: center; display: grid; gap: 8px; justify-items: center; }
.verdict.pass { background: var(--good-soft); } .verdict.fail { background: var(--bad-soft); }

/* ---------- capstone & certificate ---------- */
.rubric-tbl td { cursor: pointer; }
.rubric-tbl td.sel { background: var(--accent-soft); outline: 2px solid var(--accent); outline-offset: -2px; }
.req { display: grid; gap: 8px; }
.req-i { display: grid; grid-template-columns: 30px minmax(0, 1fr) auto; gap: 10px; align-items: center; padding: 12px 14px; border-radius: 12px; background: var(--surface); border: 1px solid var(--line); }
.req-i .st { width: 26px; height: 26px; border-radius: 50%; display: grid; place-items: center; background: var(--surface-2); color: var(--ink-3); font-weight: 800; }
.req-i.ok .st { background: var(--good); color: var(--on-status, #fff); }
.cert-tools { display: flex; gap: 10px; flex-wrap: wrap; align-items: end; margin: 16px 0; }
.cert-tools label { display: grid; gap: 4px; font: 600 .78rem var(--f-mono); color: var(--ink-2); flex: 1 1 260px; }
.cert-tools input { padding: 11px 14px; border-radius: 11px; border: 1px solid var(--line); background: var(--surface); color: var(--ink); font: 16px var(--f-body); }
.cert-canvas { width: 100%; height: auto; border-radius: 14px; box-shadow: 0 16px 40px -18px rgba(0,0,0,.45); display: block; }
.cred { font: 600 .9rem var(--f-mono); }

/* ---------- flashcards / glossary ---------- */
.fc { max-width: 620px; margin: 0 auto; display: grid; gap: 14px; }
.card3d { perspective: 1200px; cursor: pointer; }
.card3d-in { position: relative; min-height: 260px; transition: transform .5s cubic-bezier(.2,.8,.2,1); transform-style: preserve-3d; }
.card3d.flip .card3d-in { transform: rotateY(180deg); }
.face { position: absolute; inset: 0; backface-visibility: hidden; -webkit-backface-visibility: hidden; border-radius: 20px; background: var(--surface); border: 1px solid var(--line); display: grid; place-items: center; padding: 24px; text-align: center; }
.face.back { transform: rotateY(180deg); background: var(--accent-soft); }
.face b { font: 800 1.7rem var(--f-display); }
.face p { font-size: 1.05rem; }
.fc-actions { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; }
.gl-list { display: grid; gap: 8px; }
.gl-letter { font: 800 1.4rem var(--f-display); color: var(--accent); margin-top: 14px; }
.search-in { width: 100%; max-width: 460px; padding: 11px 16px; border-radius: 999px; border: 1px solid var(--line); background: var(--surface); color: var(--ink); font: 15px var(--f-body); }

/* ---------- signature diagram ---------- */
.sg text { font-family: var(--f-mono); }
.sg-loop text, .sg-trust text { text-anchor: middle; }
.sg-ring { fill: none; stroke: var(--sg-line); stroke-width: 2; stroke-dasharray: 3 6; }
.sg-arc { fill: none; stroke: var(--sg-accent); stroke-width: 2.5; }
.sg-arrow { fill: var(--sg-accent); }
.sg-node circle { fill: var(--sg-node); stroke: var(--sg-accent); stroke-width: 2; transition: transform .15s; }
.sg-node.done circle { fill: var(--sg-accent); }
.sg-node.done text { fill: var(--sg-node); }
.sg-node .sg-n { font-size: 11px; fill: var(--sg-ink-2); font-weight: 600; }
.sg-node .sg-c { font-size: 12px; fill: var(--sg-ink); font-weight: 700; }
a.sg-node:hover circle, a.sg-layer:hover rect { stroke-width: 3.5; }
.sg-title { font: 800 30px var(--f-display) !important; fill: var(--sg-ink); }
.sg-sub { font-size: 12px; fill: var(--sg-ink-2); letter-spacing: .12em; text-transform: uppercase; }
.sg-layer rect { fill: var(--sg-node); stroke: var(--sg-accent); stroke-width: 1.5; }
.sg-layer.done rect { fill: color-mix(in srgb, var(--sg-accent) 30%, var(--sg-node)); }
.sg-layer .sg-n { font-size: 11px; fill: var(--sg-ink-2); }
.sg-layer .sg-c { font-size: 13px; font-weight: 700; fill: var(--sg-ink); }
.sg-layer .sg-t { font-size: 10.5px; fill: var(--sg-ink-2); }
.sg-trust rect { fill: none; stroke: var(--sg-accent-2); stroke-width: 2.5; stroke-dasharray: 8 5; }
.sg-trust.done rect { stroke-dasharray: none; }
.sg-trust text { font-size: 11.5px; font-weight: 700; fill: var(--sg-accent-2); }

.toast { position: fixed; left: 50%; transform: translateX(-50%); bottom: calc(24px + env(safe-area-inset-bottom, 0px)); z-index: 70; background: var(--ink); color: var(--bg); padding: 10px 18px; border-radius: 12px; font-size: .92rem; max-width: calc(100% - 32px); }
.confetti { position: fixed; inset: 0; width: 100%; height: 100%; pointer-events: none; z-index: 80; }

@media (max-width: 1080px) {
  .mainnav a { padding: 7px 7px; font-size: .88rem; }
  .brand-text { display: none; }
  .mod-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 860px) {
  .mainnav { display: none; }
  .tabbar { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); position: fixed; left: 0; right: 0; bottom: 0; z-index: 40; background: var(--surface); border-top: 1px solid var(--line); padding-bottom: env(safe-area-inset-bottom, 0px); padding-left: env(safe-area-inset-left, 0px); padding-right: env(safe-area-inset-right, 0px); }
  .tabbar a { display: flex; flex-direction: column; align-items: center; gap: 2px; padding: 8px 2px 7px; text-decoration: none; color: var(--ink-2); font-size: .7rem; font-weight: 600; }
  .tabbar a[aria-current="page"] { color: var(--accent); }
  .site-foot { padding-bottom: calc(84px + env(safe-area-inset-bottom, 0px)); }
  .toast { bottom: calc(80px + env(safe-area-inset-bottom, 0px)); }
  .hero { grid-template-columns: 1fr; padding: 24px; }
  .path, .rules { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .two { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
  .mod-grid { grid-template-columns: 1fr; }
  .book-banner { grid-template-columns: 1fr; justify-items: center; text-align: center; }
  .bb-cover { width: 160px; }
  .book-banner .hero-actions { justify-content: center; }
  .cmp { grid-template-columns: 1fr; }
  .layer { grid-template-columns: 1fr; }
  .mod-hero { grid-template-columns: 1fr; }
  .bd-row { grid-template-columns: 90px minmax(0, 1fr) 46px; }
  .prog-chip i { display: none; }
}
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; } }
.search input { width: 150px; padding: 7px 12px; border-radius: 999px; border: 1px solid var(--line); background: var(--surface); color: var(--ink); font: 14px var(--f-body); }
@media (max-width: 1240px) { .search { display: none; } }
/* keep wide diagrams and tables scrolling inside their own box on small screens */
.blocks { grid-template-columns: minmax(0, 1fr); }
.blocks > *, .lesson, .case-b, .scenario, .quiz, .exam-wrap > * { min-width: 0; }
.b-text, .callout, .keypoints, .term, .fw-card p, .q-text, .opt, .q-result, .steps li, .cmp-col li, .scn, .case { overflow-wrap: anywhere; }
.quiz-top > * { min-width: 0; }

/* ---------- CLI labs ---------- */
.cli-win { border-radius: 14px; overflow: hidden; border: 1px solid #1f2633; background: #0d1117; box-shadow: 0 10px 24px -16px rgba(0,0,0,.6); }
.cli-bar { display: flex; align-items: center; gap: 7px; padding: 8px 12px; background: #161b22; color: #9da7b3; font: 600 .78rem var(--f-mono); }
.cli-bar i { width: 11px; height: 11px; border-radius: 50%; background: #ff5f56; } .cli-bar i:nth-child(2) { background: #ffbd2e; } .cli-bar i:nth-child(3) { background: #27c93f; }
.cli-bar span { margin-left: 8px; flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.cli-bar .cli-copy { background: #21262d; color: #c9d1d9; border-color: #30363d; }
.cli-body { margin: 0; padding: 14px 16px; overflow-x: auto; font: .86rem/1.6 var(--f-mono); color: #c9d1d9; }
.cli-body .c { color: #7d8590; font-style: italic; } .cli-body .p { color: #7ee787; }
.cli-note { font-size: .88rem; color: var(--ink-2); margin-top: 6px; }
/* ---------- subnet calculator ---------- */
.tool-subnet { padding: 18px; border-radius: 16px; border: 2px solid var(--accent-2); background: var(--surface); display: grid; gap: 12px; }
.sn-in { display: grid; gap: 4px; font: 600 .78rem var(--f-mono); color: var(--ink-2); max-width: 340px; }
.sn-in input { padding: 11px 14px; border-radius: 11px; border: 1px solid var(--line); background: var(--bg); color: var(--ink); font: 600 1.05rem var(--f-mono); }
.sn-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(170px, 1fr)); gap: 8px; }
.sn-grid div { padding: 10px 12px; border-radius: 10px; background: var(--surface-2); display: grid; gap: 2px; min-width: 0; }
.sn-grid small { font: 600 .7rem var(--f-mono); color: var(--ink-3); text-transform: uppercase; letter-spacing: .06em; }
.sn-grid b { font: 600 .95rem var(--f-mono); overflow-wrap: anywhere; }
/* ---------- academy ladder ---------- */
.academy { display: grid; grid-template-columns: minmax(0, 2.4fr) minmax(0, 1fr); gap: 14px; }
.ac-path { padding: 16px; border-radius: 18px; background: var(--surface); border: 1px solid var(--line); display: grid; gap: 10px; min-width: 0; }
.ac-ladder { display: flex; align-items: stretch; gap: 8px; overflow-x: auto; padding-bottom: 4px; }
.ac-tier { display: grid; gap: 8px; flex: 1 1 0; min-width: 150px; }
.ac-arrow { align-self: center; color: var(--accent); font-weight: 800; }
.ac-other { flex-direction: column; }
.ac-card { display: grid; gap: 3px; padding: 12px; border-radius: 13px; border: 1px solid var(--line); background: var(--bg); text-decoration: none; color: var(--ink); transition: border-color .15s, transform .15s; }
.ac-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.ac-card.me { border: 2px solid var(--accent); background: var(--accent-soft); }
.ac-card.soon { border-style: dashed; opacity: .78; cursor: default; }
.ac-card.soon:hover { border-color: var(--line); transform: none; }
.ac-card.soon b { color: var(--ink-2); }
.ac-card.soon .chip { justify-self: start; }
.ac-card b { font: 800 1.15rem var(--f-display); color: var(--accent); }
.ac-lv { font: 600 .68rem var(--f-mono); text-transform: uppercase; letter-spacing: .1em; color: var(--ink-3); }
.ac-n { font-size: .85rem; font-weight: 600; }
.ac-card small { font-size: .78rem; color: var(--ink-2); }
.ac-card .chip { justify-self: start; margin-top: 4px; }
@media (max-width: 860px) { .academy { grid-template-columns: 1fr; } }
/* ---------- new signature diagrams ---------- */
.sg-cable { fill: none; stroke: var(--sg-line); stroke-width: 6; stroke-linecap: round; }
.sg-pulse { stroke: var(--sg-accent); stroke-width: 2.5; stroke-dasharray: 6 14; animation: sgflow 1.6s linear infinite; }
@keyframes sgflow { to { stroke-dashoffset: -40; } }
.sg-node rect, .sg-node polygon { fill: var(--sg-node); stroke: var(--sg-accent); stroke-width: 2; }
.sg-node.done rect, .sg-node.done polygon { fill: color-mix(in srgb, var(--sg-accent) 35%, var(--sg-node)); }
.sg-path text, .sg-hex text, .sg-blueprint text { text-anchor: middle; }
.sg-path .sg-n, .sg-hex .sg-n, .sg-blueprint .sg-n { font-size: 10px; fill: var(--sg-ink-2); letter-spacing: .08em; }
.sg-path .sg-c, .sg-hex .sg-c, .sg-blueprint .sg-c { font-size: 12.5px; font-weight: 700; fill: var(--sg-ink); }
a.sg-node:hover rect, a.sg-node:hover polygon { stroke-width: 3.5; }
.sg-dim { stroke: var(--sg-accent-2); stroke-width: 1.2; }
.sg-grid { stroke: var(--sg-line); stroke-width: 1.2; stroke-dasharray: 3 3; }
.sg-sheet .sg-tb { fill: none; stroke: var(--sg-accent-2); stroke-width: 1; }

/* ---------- polish: smoothness, phones, accessibility ---------- */
.view.enter { animation: viewIn .22s cubic-bezier(.2,.7,.2,1); }
@keyframes viewIn { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }
.boot { display: grid; gap: 14px; padding-top: 8px; }
.boot i { display: block; height: 18px; border-radius: 9px; background: linear-gradient(90deg, var(--surface-2) 0, var(--surface) 50%, var(--surface-2) 100%) 0 0 / 200% 100%; animation: shimmer 1.2s linear infinite; }
.boot i:first-child { height: 220px; border-radius: 22px; }
.boot i:nth-child(3) { width: 70%; }
@keyframes shimmer { to { background-position: -200% 0; } }
.search-icon { display: none; }
@media (max-width: 1240px) { .search-icon { display: grid; } }
.search-page { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 8px; }
.search-page .search-in { flex: 1 1 240px; max-width: 520px; }
.rub-btn { all: unset; display: block; width: 100%; cursor: pointer; border-radius: 6px; padding: 2px 0; }
.rub-btn:focus-visible { outline: 3px solid var(--accent-2); outline-offset: 2px; }
.rubric-tbl td { padding: 0; } .rubric-tbl td > .rub-btn { padding: 9px 12px; box-sizing: border-box; }
.rubric-tbl td:first-child { padding: 9px 12px; }
.q-text[tabindex="-1"]:focus, .big-num[tabindex="-1"]:focus { outline: none; }
.exam-bar { transition: box-shadow .2s; }
@media (max-width: 860px) {
  .exam-bar { top: calc(env(safe-area-inset-top, 0px) + 58px); }
}
@media (max-width: 560px) {
  .lesson-row { grid-template-columns: 40px minmax(0, 1fr); gap: 10px; }
  .lesson-row > .chip { grid-column: 2; justify-self: start; }
  .lesson-row .ln { font-size: 1rem; }
}
@media (prefers-reduced-motion: reduce) { .view.enter, .boot i { animation: none; } }

/* ---------- official exam, claim and verification ---------- */
.exam-modes { margin: 16px 0; }
.exam-modes .list-card { display: flex; flex-direction: column; gap: 10px; }
.exam-modes .hero-actions { margin-top: auto; }
.claim { margin: 16px 0; border: 2px solid var(--good); }
.claim p { margin: 6px 0 4px; }
.cert-name { flex: 1 1 100%; margin: 0; }
.vf-big { font-size: clamp(2.2rem, 7vw, 3.4rem); }
dl.vf { display: grid; grid-template-columns: max-content minmax(0, 1fr); gap: 10px 20px; margin: 0; }
dl.vf dt { font: 600 .78rem var(--f-mono); color: var(--ink-3); text-transform: uppercase; letter-spacing: .04em; padding-top: 3px; }
dl.vf dd { margin: 0; font-weight: 600; overflow-wrap: anywhere; }
@media (max-width: 560px) { dl.vf { grid-template-columns: minmax(0, 1fr); gap: 2px; } dl.vf dd { margin-bottom: 10px; } }

/* ---------- account ---------- */
#acctBtn { overflow: hidden; }
#acctBtn img { width: 28px; height: 28px; border-radius: 50%; display: block; }
.acct-ini { display: inline-grid; place-items: center; width: 56px; height: 56px; border-radius: 50%; background: var(--accent); color: var(--accent-ink); font: 700 1.4rem var(--f-display); }
.acct-ini.sm { width: 28px; height: 28px; font-size: .85rem; }
.acct-card { display: grid; gap: 12px; }
.acct-who { display: flex; gap: 14px; align-items: center; min-width: 0; }
.acct-who img { border-radius: 50%; flex: none; }
.acct-who > div { min-width: 0; overflow-wrap: anywhere; }
.gsi-slot { min-height: 44px; display: flex; align-items: center; }
/* Google's button frame is a light document: match its colour scheme so dark mode shows no white box */
.gsi-slot iframe { color-scheme: light; }

/* long track names wrap to at most two lines instead of pushing the header tools off-screen */
.brand-text { min-width: 0; }
.brand-text b { max-width: 12em; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
@media (max-width: 1280px) { .brand-text b { max-width: 9em; } .brand-text small { display: none; } }