/* Backend Dojo. Warm neutral palette; sans headings and body, monospace for code and labels. */

@font-face { font-family: "Space Grotesk"; font-weight: 600; font-display: swap; src: url("../fonts/space-grotesk-latin-600.woff2") format("woff2"); }
@font-face { font-family: "Space Grotesk"; font-weight: 700; font-display: swap; src: url("../fonts/space-grotesk-latin-700.woff2") format("woff2"); }
@font-face { font-family: "IBM Plex Sans"; font-weight: 400; font-display: swap; src: url("../fonts/ibm-plex-sans-latin-400.woff2") format("woff2"); }
@font-face { font-family: "IBM Plex Sans"; font-weight: 500; font-display: swap; src: url("../fonts/ibm-plex-sans-latin-500.woff2") format("woff2"); }
@font-face { font-family: "IBM Plex Sans"; font-weight: 600; font-display: swap; src: url("../fonts/ibm-plex-sans-latin-600.woff2") format("woff2"); }
@font-face { font-family: "IBM Plex Mono"; font-weight: 400; font-display: swap; src: url("../fonts/ibm-plex-mono-latin-400.woff2") format("woff2"); }
@font-face { font-family: "IBM Plex Mono"; font-weight: 500; font-display: swap; src: url("../fonts/ibm-plex-mono-latin-500.woff2") format("woff2"); }
@font-face { font-family: "IBM Plex Mono"; font-weight: 600; font-display: swap; src: url("../fonts/ibm-plex-mono-latin-600.woff2") format("woff2"); }

:root {
  color-scheme: light;
  --bg: hsl(0, 20%, 99%);
  --surface: hsl(0, 8%, 97%);
  --surface-2: hsl(0, 8%, 93%);
  --fg: hsl(0, 5%, 12%);
  --text: hsl(0, 2%, 30%);
  --muted: hsl(0, 1%, 42%);
  --line: hsl(30, 2%, 84%);
  --accent: hsl(145, 65%, 30%);
  --accent-fg: #fff;
  --accent-soft: hsl(145, 55%, 93%);
  --accent-2: hsl(145, 65%, 30%);
  --star: hsl(42, 95%, 45%);
  --code-bg: hsl(0, 8%, 97%);
  --mark: hsl(62, 84%, 88%);
  --mark-edge: hsl(55, 70%, 42%);
  --good: hsl(150, 55%, 30%);
  --good-soft: hsl(150, 45%, 93%);
  --warn: hsl(35, 80%, 32%);
  --warn-soft: hsl(42, 85%, 91%);
  --bad: hsl(4, 60%, 45%);
  --bad-soft: hsl(5, 70%, 95%);
  --syn-kw: hsl(280, 50%, 45%);
  --syn-str: hsl(140, 45%, 30%);
  --syn-ann: hsl(25, 75%, 38%);
  --syn-num: hsl(210, 65%, 40%);
  --syn-type: hsl(185, 70%, 26%);
  --syn-com: hsl(0, 1%, 55%);
  --font-display: "Space Grotesk", "IBM Plex Sans", system-ui, sans-serif;
  --font-body: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-code: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
}
@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --bg: hsl(0, 9%, 7%); --surface: hsl(0, 6%, 10%); --surface-2: hsl(0, 6%, 14%);
    --fg: hsl(0, 15%, 94%); --text: hsl(0, 4%, 76%); --muted: hsl(0, 3%, 58%); --line: hsl(0, 4%, 19%);
    --accent: hsl(145, 63%, 49%); --accent-fg: hsl(0, 9%, 7%); --accent-soft: hsl(145, 35%, 13%); --accent-2: hsl(145, 63%, 49%);
    --star: hsl(45, 95%, 58%);
    --code-bg: hsl(0, 8%, 5%); --mark: hsl(60, 30%, 14%); --mark-edge: hsl(62, 80%, 72%);
    --good: hsl(150, 50%, 58%); --good-soft: hsl(150, 30%, 11%); --warn: hsl(40, 75%, 60%); --warn-soft: hsl(40, 40%, 12%);
    --bad: hsl(5, 80%, 68%); --bad-soft: hsl(5, 40%, 12%);
    --syn-kw: hsl(280, 60%, 78%); --syn-str: hsl(125, 40%, 70%); --syn-ann: hsl(28, 80%, 68%);
    --syn-num: hsl(210, 75%, 75%); --syn-type: hsl(183, 50%, 64%); --syn-com: hsl(0, 3%, 45%);
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body { margin: 0; background: var(--bg); color: var(--text); font-family: var(--font-body); font-size: 15px; line-height: 1.6; }
[hidden] { display: none !important; }
h1, h2, h3 { font-family: var(--font-display); color: var(--fg); text-wrap: balance; margin: 0; letter-spacing: -0.02em; }
p { margin: 0; }
button, input, select, textarea { font: inherit; color: inherit; }
a { color: var(--accent); text-underline-offset: 3px; }
code { font-family: var(--font-code); font-size: 0.88em; background: var(--surface-2); padding: 1px 6px; border-radius: 5px; color: var(--fg); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.hint { font-size: 13px; color: var(--muted); }
.eyebrow { font-family: var(--font-code); font-size: 12px; font-weight: 500; text-transform: uppercase; letter-spacing: 0.12em; color: var(--muted); }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; gap: 8px; border: 1px solid var(--line); background: var(--surface);
  border-radius: 8px; padding: 8px 14px; font-weight: 500; font-size: 14px; cursor: pointer; color: var(--fg); text-decoration: none;
}
.btn:hover:not(:disabled) { border-color: var(--muted); }
.btn.primary { background: var(--accent); color: var(--accent-fg); border-color: var(--accent); font-weight: 600; }
.btn.primary:hover:not(:disabled) { filter: brightness(1.08); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.big-btn { padding: 11px 20px; font-size: 15px; }
.link-btn { border: 0; background: none; padding: 0; color: var(--muted); font-size: 12.5px; cursor: pointer; font-family: var(--font-code); }
.link-btn:hover { color: var(--fg); }
.actions { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.msg { font-size: 13.5px; color: var(--muted); min-height: 1.4em; }
.msg.err { color: var(--bad); }
.spin {
  display: inline-block; width: 12px; height: 12px; border-radius: 50%; border: 2px solid var(--line);
  border-top-color: var(--accent); animation: spin 0.8s linear infinite; vertical-align: -1px; margin-right: 6px;
}
@keyframes spin { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) { .spin { animation: none; } }

/* Site nav */
.site-nav { position: sticky; top: 0; z-index: 20; background: color-mix(in srgb, var(--bg) 90%, transparent); backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); }
.nav-inner { max-width: 1160px; margin: 0 auto; padding: 12px 24px; display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px 24px; }
.practice .nav-inner { max-width: 1440px; padding-inline: 16px; }
.logo { font-family: var(--font-code); font-weight: 600; font-size: 16px; color: var(--fg); text-decoration: none; letter-spacing: -0.02em; }
.logo span { color: var(--accent); }
.nav-links { display: flex; flex-wrap: wrap; align-items: center; gap: 4px 22px; font-size: 14px; }
.nav-links a { color: var(--muted); text-decoration: none; }
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--fg); }
.nav-links .nav-cta { background: var(--accent); color: var(--accent-fg); padding: 6px 14px; border-radius: 8px; font-weight: 600; }
.nav-links .nav-cta:hover { color: var(--accent-fg); filter: brightness(1.08); }
@media (max-width: 640px) { .nav-inner { padding-inline: 16px; } .nav-links { gap: 4px 14px; font-size: 13px; } }

/* Marketing pages (home, contribute) */
.wrap { max-width: 1160px; margin: 0 auto; padding: 0 24px; }
@media (max-width: 640px) { .wrap { padding: 0 16px; } }
.home section { padding: 88px 0; border-bottom: 1px solid var(--line); }
.home h2 { font-size: clamp(28px, 4vw, 42px); font-weight: 700; line-height: 1.12; margin: 10px 0 12px; max-width: 22ch; }
.home h3 { font-size: 17px; font-weight: 600; margin-bottom: 6px; }
.home .eyebrow { display: inline-flex; align-items: center; gap: 8px; color: var(--accent); }
.section-lede { color: var(--muted); max-width: 64ch; margin-bottom: 36px; font-size: 16.5px; }

.hero-grid { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr); gap: 56px; align-items: center; }
@media (max-width: 960px) { .hero-grid { grid-template-columns: minmax(0, 1fr); gap: 32px; } }
.hero h1 { font-size: clamp(38px, 5.6vw, 64px); line-height: 1.04; font-weight: 700; letter-spacing: -0.035em; margin: 14px 0 20px; }
.lede { font-size: 18px; color: var(--muted); max-width: 52ch; margin-bottom: 28px; }
.lede b { color: var(--fg); font-weight: 600; }
.badges { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 22px; }
.badge { font-family: var(--font-code); font-size: 12px; color: var(--muted); border: 1px solid var(--line); border-radius: 6px; padding: 3px 9px; }





.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 14px; }
.card { border: 1px solid var(--line); border-radius: 14px; padding: 22px; background: var(--surface); }
.card p { color: var(--muted); font-size: 14.5px; }

.trust { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 24px; margin-top: 40px; }
.trust p { color: var(--muted); font-size: 14.5px; }
.trust h3::before { content: "[*] "; font-family: var(--font-code); color: var(--accent-2); font-size: 14px; }

.contribute-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 40px; align-items: start; }
@media (max-width: 960px) { .contribute-grid { grid-template-columns: minmax(0, 1fr); } }
.contribute-grid > div:first-child { display: grid; gap: 14px; justify-items: start; }
.contribute-grid .section-lede { margin-bottom: 0; }
.plain { margin: 0; padding-left: 20px; display: grid; gap: 6px; }
.json { padding: 14px 18px !important; white-space: pre; }

.site-foot { padding: 32px 0 40px; font-size: 14px; }
.foot-inner { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px 24px; align-items: center; }
.site-foot nav { display: flex; flex-wrap: wrap; gap: 6px 20px; }
.site-foot a { color: var(--muted); text-decoration: none; }
.site-foot a:hover { color: var(--fg); }

/* Contribute page */
.page-hero h1 { font-size: clamp(34px, 5vw, 52px); line-height: 1.06; letter-spacing: -0.03em; margin: 14px 0 18px; max-width: 18ch; }
.toc { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 8px; }
.toc a { border: 1px solid var(--line); background: var(--surface); border-radius: 8px; padding: 5px 12px; font-size: 13.5px; color: var(--fg); text-decoration: none; }
.toc a:hover { border-color: var(--accent); }
.guide { list-style: none; counter-reset: step; margin: 0; padding: 0; display: grid; gap: 26px; max-width: 820px; }
.guide li { counter-increment: step; position: relative; padding-left: 52px; min-width: 0; }
.guide li::before {
  content: counter(step); position: absolute; left: 0; top: -2px; width: 32px; height: 32px; border-radius: 9px;
  display: grid; place-items: center; background: var(--accent-soft); color: var(--accent); font-family: var(--font-code); font-weight: 600;
}
.guide p { color: var(--muted); }
.cmd { margin: 10px 0 0; padding: 12px 14px; border-radius: 10px; border: 1px solid var(--line); background: var(--code-bg); font-family: var(--font-code); font-size: 13px; line-height: 1.6; overflow-x: auto; white-space: pre; color: var(--fg); }
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 12px; }
.ref-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.ref-table th, .ref-table td { text-align: left; padding: 10px 14px; border-bottom: 1px solid var(--line); vertical-align: top; }
.ref-table th { background: var(--surface-2); font-family: var(--font-code); font-size: 12px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--muted); }
.ref-table tr:last-child td { border-bottom: 0; }
.ref-table td:first-child { white-space: nowrap; }
.sub { margin: 36px 0 12px; }
.checklist { list-style: none; margin: 8px 0 28px; padding: 0; display: grid; gap: 10px; max-width: 760px; }
.checklist li { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 12px; }
.checklist li::before { content: "[ ]"; font-family: var(--font-code); color: var(--accent-2); }

/* Practice page */
.page {
  max-width: 1440px; margin: 0 auto;
  padding: 20px max(16px, env(safe-area-inset-right, 0px)) 32px max(16px, env(safe-area-inset-left, 0px));
  display: grid; gap: 18px;
}
.top { display: flex; flex-wrap: wrap; align-items: flex-end; justify-content: space-between; gap: 12px 24px; }
.brand h1 { font-size: clamp(26px, 3.2vw, 34px); font-weight: 700; }
.brand p { color: var(--muted); max-width: 62ch; margin-top: 4px; }
.top-actions { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.status {
  display: inline-flex; align-items: center; gap: 8px; font-size: 13px; color: var(--muted); cursor: pointer;
  border: 1px solid var(--line); border-radius: 8px; padding: 5px 12px; background: var(--surface); font-family: var(--font-code);
}
.status:hover { border-color: var(--muted); }
.status .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--warn); }
.status[data-state="on"] .dot { background: var(--good); }
.banner { background: var(--accent-soft); border-radius: 10px; padding: 10px 14px; font-size: 14px; color: var(--fg); }
.banner.err { background: var(--bad-soft); color: var(--bad); }

.modes { display: flex; gap: 4px; border-bottom: 1px solid var(--line); overflow-x: auto; }
.mode-tab {
  border: 0; background: none; padding: 10px 14px; font-size: 14.5px; font-weight: 500; color: var(--muted); cursor: pointer;
  border-bottom: 2px solid transparent; margin-bottom: -1px; white-space: nowrap; display: inline-flex; gap: 8px; align-items: center;
}
.mode-tab:hover { color: var(--fg); }
.mode-tab[aria-pressed="true"] { color: var(--fg); border-bottom-color: var(--accent); }
.mode-tab .count { font-family: var(--font-code); font-size: 11.5px; padding: 0 6px; border-radius: 5px; background: var(--surface-2); color: var(--muted); }

.layout { display: grid; grid-template-columns: 270px minmax(0, 1fr); gap: 24px; align-items: start; }
@media (max-width: 900px) { .layout { grid-template-columns: minmax(0, 1fr); } }
.rail { display: grid; gap: 14px; position: sticky; top: 72px; }
@media (max-width: 900px) { .rail { position: static; } }
.topics { display: flex; flex-wrap: wrap; gap: 6px; }
.chip { border: 1px solid var(--line); background: var(--surface); border-radius: 7px; padding: 4px 10px; font-size: 13px; cursor: pointer; color: var(--text); }
.chip:hover { border-color: var(--muted); }
.chip[aria-pressed="true"] { background: var(--fg); color: var(--bg); border-color: var(--fg); }
.exlist { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; }
.exbtn {
  width: 100%; text-align: left; cursor: pointer; display: grid; grid-template-columns: minmax(0, 1fr) auto;
  gap: 2px 10px; align-items: center; padding: 10px 12px; border-radius: 10px; border: 1px solid transparent; background: transparent;
}
.exbtn:hover { background: var(--surface); border-color: var(--line); }
.exbtn[aria-current="true"] { background: var(--surface); border-color: var(--accent); }
.exbtn .t { font-weight: 600; font-size: 14.5px; color: var(--fg); }
.exbtn .l { font-size: 12.5px; color: var(--muted); grid-column: 1; }
.best { grid-row: 1 / span 2; grid-column: 2; font-family: var(--font-code); font-size: 12px; font-variant-numeric: tabular-nums; padding: 2px 8px; border-radius: 6px; background: var(--surface-2); color: var(--muted); }
.best.hi { background: var(--good-soft); color: var(--good); }
.best.mid { background: var(--warn-soft); color: var(--warn); }
.best.lo { background: var(--bad-soft); color: var(--bad); }
.how { font-size: 13px; color: var(--muted); border-top: 1px solid var(--line); padding-top: 12px; }

main { display: grid; gap: 16px; min-width: 0; }
.home main { display: block; }
.exhead { display: grid; gap: 6px; }
.exhead .meta { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; font-size: 13px; color: var(--muted); font-family: var(--font-code); }
.exhead h2 { font-size: clamp(22px, 2.6vw, 28px); font-weight: 700; }
.pr { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 12px 16px; max-width: 86ch; font-size: 14.5px; }
.pr b { font-weight: 600; color: var(--fg); }

.work { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr); gap: 16px; align-items: start; }
.work.single { grid-template-columns: minmax(0, 1fr); max-width: 980px; }
@media (max-width: 1180px) { .work { grid-template-columns: minmax(0, 1fr); } }

.code { background: var(--code-bg); border: 1px solid var(--line); border-radius: 12px; overflow: hidden; min-width: 0; }
.code .bar { display: flex; justify-content: space-between; align-items: center; gap: 8px; padding: 8px 12px; border-bottom: 1px solid var(--line); font-family: var(--font-code); font-size: 12px; color: var(--muted); background: var(--surface); }
.bar-actions { display: inline-flex; gap: 14px; }
.code pre { margin: 0; overflow-x: auto; padding: 8px 0; font-family: var(--font-code); font-size: 13px; line-height: 1.65; color: var(--fg); }
.ln { display: grid; grid-template-columns: 3.2em minmax(0, 1fr); min-width: max-content; padding-right: 16px; }
.ln .no { text-align: right; padding-right: 14px; color: var(--syn-com); user-select: none; font-variant-numeric: tabular-nums; }
.ln .src { white-space: pre; }
.ln.mark { background: var(--mark); box-shadow: inset 3px 0 0 var(--mark-edge); }
.pin { display: inline-block; margin-left: 10px; padding: 0 6px; border-radius: 5px; font-size: 11px; background: var(--mark-edge); color: #1A1505; font-weight: 500; }
.k { color: var(--syn-kw); } .s { color: var(--syn-str); } .a { color: var(--syn-ann); }
.n { color: var(--syn-num); } .ty { color: var(--syn-type); } .c { color: var(--syn-com); font-style: italic; }

/* Editor */
.editor { font-family: var(--font-code); font-size: 13px; line-height: 1.65; }
.ed-scroll { display: grid; grid-template-columns: auto minmax(0, 1fr); overflow-x: auto; min-height: 320px; }
.editor .ed-gutter { overflow: visible; position: sticky; left: 0; z-index: 1; margin: 0; padding: 10px 12px 10px 10px; text-align: right; color: var(--syn-com); background: var(--code-bg); user-select: none; font: inherit; border-right: 1px solid var(--line); }
.editor .ed-stack { display: grid; }
.editor .ed-hl, .editor .ed-input { overflow: visible; grid-area: 1 / 1; margin: 0; padding: 10px 16px 10px 12px; font: inherit; line-height: inherit; white-space: pre; tab-size: 4; border: 0; letter-spacing: normal; }
.editor .ed-hl { pointer-events: none; color: var(--fg); }
.editor .ed-input { color: transparent; caret-color: var(--fg); background: transparent; resize: none; overflow: hidden; outline: none; min-height: 100%; border-radius: 0; }
.ed-input::selection { background: color-mix(in srgb, var(--accent) 30%, transparent); }
.editor-panel:focus-within { border-color: var(--accent); }

/* Output */
.output { border: 1px solid var(--line); border-radius: 12px; background: var(--surface); padding: 14px 16px; display: grid; gap: 10px; min-width: 0; }
.out-head { display: flex; justify-content: space-between; align-items: baseline; gap: 8px; flex-wrap: wrap; }
.out-head h3 { font-size: 15px; }
.out-body { display: grid; gap: 10px; }
.out-sum { font-weight: 600; }
.out-sum.good { color: var(--good); }
.out-sum.bad { color: var(--bad); }
.out-text { margin: 0; padding: 10px 12px; border-radius: 8px; background: var(--code-bg); border: 1px solid var(--line); font-family: var(--font-code); font-size: 12.5px; white-space: pre-wrap; overflow-x: auto; color: var(--fg); }
.out-text.bad { color: var(--bad); }
.tests { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; }
.tests li { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 2px 10px; font-size: 14px; }
.tests .mk { font-family: var(--font-code); font-size: 11.5px; font-weight: 600; padding: 1px 7px; border-radius: 5px; align-self: start; margin-top: 2px; }
.tests .pass .mk { background: var(--good-soft); color: var(--good); }
.tests .fail .mk { background: var(--bad-soft); color: var(--bad); }
.tests .nt { grid-column: 2; color: var(--muted); font-size: 13px; }
details summary { cursor: pointer; font-size: 13px; color: var(--muted); }
.tests-src pre { margin: 8px 0 0; max-height: 360px; overflow: auto; font-family: var(--font-code); font-size: 12.5px; line-height: 1.6; background: var(--code-bg); border: 1px solid var(--line); border-radius: 8px; padding: 8px 0; color: var(--fg); }

/* Answer pad */
.pad { display: grid; gap: 10px; min-width: 0; }
.pad label { font-weight: 600; font-size: 14px; color: var(--fg); }
textarea {
  width: 100%; min-height: 300px; resize: vertical; padding: 12px 14px; border-radius: 12px;
  border: 1px solid var(--line); background: var(--surface); font-family: var(--font-code); font-size: 13px; line-height: 1.6;
}
textarea.tall { min-height: 440px; }
textarea:focus, input:focus, select:focus { border-color: var(--accent); outline: none; box-shadow: 0 0 0 3px var(--accent-soft); }
.editor .ed-input, .editor .ed-input:focus { box-shadow: none; min-height: 0; border-radius: 0; resize: none; }

/* Results */
.results { display: grid; gap: 16px; background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 20px; }
.scoreline { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 24px; }
.big { font-family: var(--font-display); font-size: 46px; font-weight: 700; line-height: 1; font-variant-numeric: tabular-nums; }
.big.hi { color: var(--good); } .big.mid { color: var(--warn); } .big.lo { color: var(--bad); }
.scorebits { display: grid; gap: 2px; font-size: 14px; }
.scorebits .src { color: var(--muted); font-size: 13px; }
.comm { margin-left: auto; text-align: right; display: grid; gap: 2px; }
.comm .val { font-family: var(--font-display); font-size: 22px; font-weight: 700; color: var(--fg); }
@media (max-width: 560px) { .comm { margin-left: 0; text-align: left; } }
.summary { background: var(--accent-soft); border-radius: 10px; padding: 10px 14px; font-size: 14.5px; max-width: 90ch; color: var(--fg); }
.summary b { font-weight: 600; }
.results h3 { font-size: 17px; font-weight: 600; }
.model-answer { max-width: 90ch; }
.issues { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.issue { border: 1px solid var(--line); border-radius: 11px; padding: 12px 14px; display: grid; gap: 6px; box-shadow: inset 4px 0 0 var(--line); background: var(--bg); }
.issue.v-found { box-shadow: inset 4px 0 0 var(--good); }
.issue.v-partial { box-shadow: inset 4px 0 0 var(--warn); }
.issue.v-missed { box-shadow: inset 4px 0 0 var(--bad); }
.ihead { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 10px; }
.ihead strong { font-weight: 600; font-size: 15px; color: var(--fg); }
.tag { font-family: var(--font-code); font-size: 11.5px; font-weight: 500; padding: 2px 8px; border-radius: 6px; }
.tag.must { background: var(--bad-soft); color: var(--bad); }
.tag.should { background: var(--surface-2); color: var(--muted); }
.tag.lineref { background: var(--mark); color: var(--fg); }
.issue .why, .issue .fix { font-size: 14px; max-width: 90ch; }
.issue .fix b { font-weight: 600; color: var(--fg); }
.issue .note { font-size: 13.5px; color: var(--muted); border-left: 2px solid var(--line); padding-left: 10px; }
.seg { display: inline-flex; border: 1px solid var(--line); border-radius: 8px; overflow: hidden; justify-self: start; background: var(--surface); }
.seg button { border: 0; background: transparent; padding: 4px 12px; font-size: 13px; cursor: pointer; }
.seg button + button { border-left: 1px solid var(--line); }
.seg button[aria-pressed="true"] { background: var(--fg); color: var(--bg); font-weight: 600; }
.seg button[aria-pressed="true"][data-v="found"] { background: var(--good-soft); color: var(--good); }
.seg button[aria-pressed="true"][data-v="partial"] { background: var(--warn-soft); color: var(--warn); }
.seg button[aria-pressed="true"][data-v="missed"] { background: var(--bad-soft); color: var(--bad); }
.extras { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.extras li { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 2px 10px; font-size: 14px; }
.extras .mk { font-weight: 600; font-size: 12px; padding: 1px 7px; border-radius: 6px; align-self: start; margin-top: 2px; }
.extras .mk.ok { background: var(--good-soft); color: var(--good); }
.extras .mk.no { background: var(--bad-soft); color: var(--bad); }
.extras .nt { grid-column: 2; color: var(--muted); font-size: 13.5px; }
.refs { margin: 0; padding-left: 20px; display: grid; gap: 4px; font-size: 14px; }
.foot { font-size: 12.5px; color: var(--muted); border-top: 1px solid var(--line); padding-top: 12px; }

/* Ask AI */
.ask-btn {
  position: fixed; right: 20px; bottom: 20px; z-index: 30; border: 0; border-radius: 999px; padding: 11px 18px;
  background: var(--accent); color: var(--accent-fg); font-weight: 600; cursor: pointer; box-shadow: 0 10px 30px -10px rgb(0 0 0 / 0.5);
}
.ask-btn:hover { filter: brightness(1.08); }
.ask-open .ask-btn { display: none; }
.ask-panel {
  position: fixed; top: 0; right: 0; bottom: 0; z-index: 40; width: min(440px, 100vw);
  display: grid; grid-template-rows: auto minmax(0, 1fr) auto; background: var(--bg); border-left: 1px solid var(--line);
  box-shadow: -20px 0 50px -30px rgb(0 0 0 / 0.6);
}
.ask-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; padding: 16px 18px; border-bottom: 1px solid var(--line); }
.ask-head h2 { font-size: 18px; }
.ask-head-actions { display: flex; gap: 14px; padding-top: 4px; }
.ask-log { overflow-y: auto; padding: 16px 18px; display: grid; gap: 12px; align-content: start; }
.ask-empty { display: grid; gap: 12px; justify-items: start; color: var(--muted); font-size: 14px; }
.ask-ideas { display: flex; flex-wrap: wrap; gap: 6px; }
.ask-msg { display: grid; gap: 4px; }
.ask-msg .who { font-family: var(--font-code); font-size: 11.5px; color: var(--muted); text-transform: uppercase; letter-spacing: 0.08em; }
.ask-msg .text { white-space: pre-wrap; overflow-wrap: anywhere; font-size: 14px; line-height: 1.6; padding: 10px 12px; border-radius: 10px; background: var(--surface); border: 1px solid var(--line); color: var(--fg); }
.ask-msg.user .text { background: var(--accent-soft); border-color: transparent; }
.ask-msg.err .text { color: var(--bad); }
.ask-form { border-top: 1px solid var(--line); padding: 12px 18px 16px; display: grid; gap: 8px; }
.ask-form textarea { min-height: 76px; font-family: var(--font-body); font-size: 14px; }
.ask-row { display: flex; justify-content: space-between; align-items: center; gap: 10px; }

/* Dialogs */
dialog { border: 1px solid var(--line); border-radius: 14px; padding: 0; background: var(--bg); color: var(--text); width: min(520px, calc(100vw - 32px)); }
dialog::backdrop { background: rgb(0 0 0 / 0.5); }
.dlg { display: grid; gap: 8px; padding: 22px; }
.dlg h2 { font-size: 20px; }
.dlg label { font-weight: 600; font-size: 14px; margin-top: 6px; color: var(--fg); }
.dlg input[type="password"], .dlg input[list], .dlg select { width: 100%; padding: 8px 10px; border-radius: 9px; border: 1px solid var(--line); background: var(--surface); }
.dlg .check { display: flex; gap: 8px; align-items: center; font-weight: 500; }
.dlg .actions { margin-top: 8px; }
.orlogin { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin-top: 6px; }
.note-box { background: var(--warn-soft); color: var(--fg); border-radius: 10px; padding: 10px 12px; font-size: 13px; }
.note-box b { color: var(--warn); }

/* Dashboard (home) */
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.home .dash-hero { padding: 64px 0 56px; }
.dash-hero h1 { font-size: clamp(34px, 4.6vw, 52px); line-height: 1.06; letter-spacing: -0.03em; margin: 12px 0 16px; max-width: 16ch; }
.bar { height: 8px; border-radius: 99px; background: var(--surface-2); overflow: hidden; }
.bar span { display: block; height: 100%; background: var(--accent); border-radius: 99px; min-width: 0; }
.progress-card { border: 1px solid var(--line); border-radius: 16px; background: var(--surface); padding: 24px; display: grid; gap: 14px; }
.pc-head { display: flex; justify-content: space-between; align-items: baseline; gap: 8px; }
.pc-head h2 { font-size: 18px; }
.pc-score { display: flex; align-items: baseline; gap: 8px; }
.pc-num { font-family: var(--font-display); font-size: 44px; font-weight: 700; color: var(--fg); line-height: 1; font-variant-numeric: tabular-nums; }
.pc-of { color: var(--muted); font-family: var(--font-code); font-size: 13px; }
.pc-stats { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 8px; margin: 0; }
.pc-stats div { border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; background: var(--bg); }
.pc-stats dt { font-family: var(--font-code); font-size: 11.5px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); }
.pc-stats dd { margin: 2px 0 0; font-weight: 600; color: var(--fg); font-variant-numeric: tabular-nums; }
.pc-modes { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.pc-modes li { display: grid; grid-template-columns: 1fr auto; gap: 4px 10px; align-items: center; font-size: 14px; }
.pc-modes li .bar { grid-column: 1 / -1; height: 5px; }
.pc-modes a { color: var(--fg); text-decoration: none; }
.pc-modes a:hover { color: var(--accent); }

.section-head { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: flex-end; gap: 16px; }
.section-head .section-lede { margin-bottom: 20px; }
.kit-bar { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 14px; align-items: center; margin-bottom: 24px; }
.kit { list-style: none; margin: 0; padding: 0; display: grid; gap: 0; border: 1px solid var(--line); border-radius: 14px; background: var(--surface); overflow: hidden; }
.kit-step { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 16px; padding: 18px 22px; border-bottom: 1px solid var(--line); }
.kit-step:last-child { border-bottom: 0; }
.kit-num { width: 32px; height: 32px; border-radius: 50%; display: grid; place-items: center; font-family: var(--font-code); font-weight: 600; border: 1px solid var(--line); color: var(--muted); background: var(--bg); }
.kit-step.done .kit-num { background: var(--accent); border-color: var(--accent); color: var(--accent-fg); }
.kit-body { display: grid; gap: 10px; min-width: 0; }
.kit-row { display: flex; justify-content: space-between; align-items: baseline; gap: 8px; }
.kit-row h3 { font-size: 16px; margin: 0; }
.kit-items { display: flex; flex-wrap: wrap; gap: 8px; }
.kit-item { display: inline-flex; align-items: center; gap: 8px; border: 1px solid var(--line); border-radius: 8px; padding: 5px 10px; font-size: 13.5px; color: var(--fg); text-decoration: none; background: var(--bg); }
.kit-item:hover { border-color: var(--accent); }
.kit-item .dot { width: 8px; height: 8px; border-radius: 50%; border: 1.5px solid var(--muted); }
.kit-item.attempted .dot { border-color: var(--warn); background: var(--warn); }
.kit-item.solved .dot { border-color: var(--accent); background: var(--accent); }
.kit-mode { font-family: var(--font-code); font-size: 11px; color: var(--muted); }

.skills { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 14px; }
.skill { border: 1px solid var(--line); border-radius: 14px; padding: 20px; background: var(--surface); display: grid; gap: 10px; color: inherit; text-decoration: none; align-content: start; transition: border-color 0.15s; }
.skill:hover { border-color: var(--accent); }
.skill-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 8px; }
.skill h3 { font-size: 16px; margin: 0; }
.skill p { color: var(--muted); font-size: 14px; }
.skill .skill-meta { font-family: var(--font-code); font-size: 12px; }
.stars { display: inline-flex; gap: 1px; font-size: 15px; line-height: 1; white-space: nowrap; }
.stars span { color: var(--line); }
.stars span.on { color: var(--star); }

.explorer { display: grid; grid-template-columns: 240px minmax(0, 1fr); gap: 28px; align-items: start; margin-top: 24px; }
@media (max-width: 860px) { .explorer { grid-template-columns: minmax(0, 1fr); } }
.filters { display: grid; gap: 18px; position: sticky; top: 76px; }
@media (max-width: 860px) { .filters { position: static; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); } }
.filters fieldset { border: 0; padding: 0; margin: 0; display: grid; gap: 6px; }
.filters legend { font-family: var(--font-code); font-size: 11.5px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); margin-bottom: 4px; }
.filters label { display: flex; gap: 8px; align-items: center; font-size: 14px; color: var(--text); cursor: pointer; }
.filters input[type="checkbox"], .filters input[type="radio"] { accent-color: var(--accent); }
.filters select, .search input { width: 100%; padding: 8px 10px; border-radius: 8px; border: 1px solid var(--line); background: var(--surface); }
.challenges { list-style: none; margin: 8px 0 0; padding: 0; display: grid; gap: 10px; }
.ch { display: grid; grid-template-columns: minmax(0, 1fr) auto auto; gap: 12px 20px; align-items: center; border: 1px solid var(--line); border-radius: 12px; padding: 16px 18px; background: var(--surface); }
@media (max-width: 640px) { .ch { grid-template-columns: minmax(0, 1fr) auto; } .ch-facts { grid-column: 1 / -1; grid-row: 2; } }
.ch-title { font-family: var(--font-display); font-size: 17px; font-weight: 600; color: var(--fg); text-decoration: none; }
.ch-title:hover { color: var(--accent); }
.ch-meta { font-size: 13px; color: var(--muted); margin-top: 2px; }
.ch-facts { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 14px; font-size: 13px; }
.pill { font-family: var(--font-code); font-size: 11.5px; padding: 2px 8px; border-radius: 6px; }
.pill.lvl-0 { background: var(--good-soft); color: var(--good); }
.pill.lvl-1 { background: var(--warn-soft); color: var(--warn); }
.pill.lvl-2 { background: var(--bad-soft); color: var(--bad); }
.ch-pts { font-family: var(--font-code); color: var(--muted); }
.ch-status { font-family: var(--font-code); min-width: 7ch; }
.ch-status.solved { color: var(--accent); }
.ch-status.attempted { color: var(--warn); }

.strip-inner { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 24px; align-items: center; }
@media (max-width: 860px) { .strip-inner { grid-template-columns: minmax(0, 1fr); } }
.strip-side { display: grid; gap: 10px; }
.strip .section-lede { margin-bottom: 0; }