@font-face { font-family: "Inter"; font-style: normal; font-display: swap; font-weight: 100 900; src: url(/assets/fonts/inter-latin-wght-normal.woff2) format("woff2"); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; }
@font-face { font-family: "Inter"; font-style: normal; font-display: swap; font-weight: 100 900; src: url(/assets/fonts/inter-latin-ext-wght-normal.woff2) format("woff2"); unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF; }
@font-face { font-family: "JetBrains Mono"; font-style: normal; font-display: swap; font-weight: 100 800; src: url(/assets/fonts/jetbrains-mono-latin-wght-normal.woff2) format("woff2"); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; }
@font-face { font-family: "JetBrains Mono"; font-style: normal; font-display: swap; font-weight: 100 800; src: url(/assets/fonts/jetbrains-mono-latin-ext-wght-normal.woff2) format("woff2"); unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF; }
:root {
  --bg: #f8fafc;
  --card: #ffffff;
  --sunk: #f1f5f9;
  --ink: #0f172a;
  --ink-2: #1e293b;
  --muted: #475569;
  --line: #e2e8f0;
  --line-strong: #cbd5e1;
  --brand: #2563eb;
  --brand-strong: #1d4ed8;
  --brand-ink: #ffffff;
  --brand-tint: #eff6ff;
  --brand-tint-2: #e5eeff;
  --good: #047857;
  --good-bg: #ecfdf5;
  --good-line: #a7f3d0;
  --bad: #b91c1c;
  --bad-bg: #fef2f2;
  --bad-line: #fecaca;
  --warn: #b45309;
  --warn-bg: #fef3c7;
  --warn-line: #fcd34d;
  --info: #1d4ed8;
  --info-bg: #eff6ff;
  --radius: 8px;
  --radius-sm: 6px;
  --shadow: 0 1px 3px 0 rgba(15, 23, 42, 0.05), 0 1px 2px -1px rgba(15, 23, 42, 0.05);
  --shadow-up: 0 20px 25px -5px rgba(15, 23, 42, 0.1), 0 8px 10px -6px rgba(15, 23, 42, 0.08);
  --sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, Menlo, monospace;
  --zc-accent: var(--brand-strong);
  --zc-accent-ink: var(--brand-ink);
  --zc-radius-control: var(--radius-sm);
  --zc-font: var(--sans);
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1220;
    --card: #111a2e;
    --sunk: #172036;
    --ink: #e2e8f0;
    --ink-2: #cbd5e1;
    --muted: #9aa8bd;
    --line: #243049;
    --line-strong: #34425f;
    --brand: #7aa7ff;
    --brand-strong: #7aa7ff;
    --brand-ink: #0b1220;
    --brand-tint: #152448;
    --brand-tint-2: #1a2c57;
    --good: #5ee0a8;
    --good-bg: #0f2e25;
    --good-line: #1d5a45;
    --bad: #ff9a94;
    --bad-bg: #3a1a1c;
    --bad-line: #6b2a2d;
    --warn: #fbbf5a;
    --warn-bg: #33250c;
    --warn-line: #6b4a12;
    --info: #9cc0ff;
    --info-bg: #152448;
    --shadow: none;
    --shadow-up: 0 20px 25px -5px rgba(0, 0, 0, 0.5);
    color-scheme: dark;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 16px/1.625 var(--sans); font-feature-settings: "cv11", "ss03"; }
:focus-visible { outline: 2px solid var(--brand); outline-offset: 2px; }
a { color: var(--brand); }
h1 { font-size: 1.5rem; line-height: 1.33; font-weight: 700; letter-spacing: -0.015em; margin: 0.4rem 0 1rem; }
h2 { font-size: 1.15rem; line-height: 1.4; font-weight: 600; letter-spacing: -0.01em; margin: 1.4rem 0 0.6rem; }
.card > h2:first-child, .card h2:first-child { margin-top: 0; }
h3 { font-size: 1rem; font-weight: 600; margin: 1rem 0 0.4rem; }
main { max-width: 760px; margin: 0 auto; padding: 12px 16px 96px; }
main.wide { max-width: 1080px; }
.top { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 10px 16px; min-height: 56px; background: var(--card); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 20; }
.brand { display: inline-flex; align-items: center; gap: 8px; font-weight: 700; letter-spacing: -0.01em; text-decoration: none; color: var(--ink); font-size: 1.15rem; }
.brand svg { width: 22px; height: 22px; color: var(--brand); flex: none; }
.top-right { display: flex; align-items: center; gap: 12px; font-size: 0.9rem; min-width: 0; }
.who { color: var(--muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 40vw; }
.lang { font: 600 0.8rem/1 var(--mono); text-decoration: none; border: 1.5px solid var(--line-strong); padding: 6px 8px; border-radius: var(--radius-sm); color: var(--ink-2); }
.nav { background: var(--brand-tint); border-bottom: 1px solid var(--line); position: sticky; top: 56px; z-index: 19; }
.nav-inner { display: flex; gap: 4px; overflow-x: auto; padding: 0 12px; scrollbar-width: none; max-width: 1080px; margin: 0 auto; }
.nav-inner::-webkit-scrollbar { display: none; }
.nav a { padding: 11px 10px; white-space: nowrap; text-decoration: none; color: var(--muted); border-bottom: 3px solid transparent; font-size: 0.92rem; font-weight: 500; }
.nav a[aria-current="page"] { color: var(--ink); border-bottom-color: var(--brand); font-weight: 600; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); padding: 16px; margin: 0 0 14px; }
.card.narrow { max-width: 420px; margin: 24px auto 14px; }
body.bare main { padding-top: 24px; }
.cards { list-style: none; padding: 0; margin: 0; display: grid; gap: 12px; }
@media (min-width: 720px) { .cards { grid-template-columns: repeat(2, 1fr); } }
.cards .card { margin: 0; }
.plain { list-style: none; padding: 0; margin: 0; }
.plain > li { padding: 6px 0; }
.plain > li + li { border-top: 1px solid var(--line); }
.plain.items > li, .plain.review > li, .plain.mails > li { border-top: none; }
.plain > li.card { padding: 16px; }
.muted { color: var(--muted); }
.small { font-size: 0.875rem; }
.note { background: var(--brand-tint); color: var(--ink-2); border-radius: var(--radius); padding: 10px 14px; font-size: 0.92rem; }
.error { background: var(--bad-bg); color: var(--bad); border: 1px solid var(--bad-line); border-radius: var(--radius); padding: 10px 14px; }
.error ul { margin: 6px 0 0; padding-left: 20px; }
.flash { background: var(--good-bg); color: var(--good); border: 1px solid var(--good-line); border-radius: var(--radius); padding: 10px 14px; margin-bottom: 14px; font-weight: 600; }
.flash.bad { background: var(--bad-bg); color: var(--bad); border-color: var(--bad-line); }
button, .button { font: inherit; display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 48px; padding: 0 20px; border-radius: var(--radius-sm); border: 1.5px solid var(--line-strong); background: var(--card); color: var(--ink-2); text-decoration: none; cursor: pointer; font-weight: 600; font-size: 0.95rem; }
button:hover, .button:hover { background: var(--bg); border-color: #94a3b8; }
button svg, .button svg { width: 20px; height: 20px; flex: none; }
button.primary, .button.primary { background: var(--brand-strong); color: var(--brand-ink); border-color: var(--brand-strong); }
button.primary:hover, .button.primary:hover { background: #1e40af; border-color: #1e40af; }
button.big { min-height: 52px; padding: 0 28px; font-size: 1.05rem; width: 100%; }
button:disabled { opacity: 0.45; cursor: default; }
button.link, .link { background: none; border: none; padding: 0; min-height: 0; color: var(--brand-strong); font-weight: 500; text-decoration: underline; text-underline-offset: 2px; cursor: pointer; }
button.link:hover { background: none; }
.danger-link { background: none; border: none; color: var(--bad); padding: 0 4px; min-height: 0; text-decoration: underline; font-weight: 500; }
form.inline { display: inline; }
.actions { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin-top: 10px; }
.sticky-actions { position: sticky; bottom: 0; background: var(--card); padding: 12px 0 calc(12px + env(safe-area-inset-bottom)); border-top: 1px solid var(--line); }
.head-row { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px; }
.head-row h1, .head-row h2 { margin: 0.2rem 0; }
.stack { display: grid; gap: 12px; }
.field { display: grid; gap: 4px; }
.field .label { font-weight: 600; font-size: 0.875rem; color: var(--ink-2); }
.help { color: var(--muted); font-size: 0.82rem; line-height: 1.45; }
input, select, textarea { font: inherit; color: var(--ink); background: var(--card); border: 1.5px solid var(--line-strong); border-radius: var(--radius-sm); padding: 10px 14px; width: 100%; min-height: 48px; }
input:focus, select:focus, textarea:focus { outline: none; border-color: var(--brand); box-shadow: 0 0 0 2px var(--brand-tint-2); }
textarea { resize: vertical; }
input[type="checkbox"], input[type="radio"] { width: 20px; height: 20px; min-height: 0; padding: 0; accent-color: var(--brand); flex: none; }
.check { display: inline-flex; align-items: center; gap: 8px; padding: 4px 0; }
fieldset { border: 1px solid var(--line); border-radius: var(--radius); padding: 10px 14px; margin: 0; display: grid; gap: 6px; }
legend { font-weight: 600; padding: 0 4px; }
.grid2, .grid3 { display: grid; gap: 12px; }
@media (min-width: 640px) { .grid2 { grid-template-columns: 1fr 1fr; } .grid3 { grid-template-columns: 1fr 1fr 1fr; } }
.row-form { display: flex; gap: 8px; }
.row-form input { flex: 1; }
.filters { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 8px; }
.filters select, .filters input { width: auto; flex: 1 1 140px; }
.badge { display: inline-block; font-size: 0.75rem; line-height: 1.4; font-weight: 600; letter-spacing: 0.01em; padding: 2px 8px; border-radius: 4px; border: 1px solid var(--line); background: var(--sunk); color: var(--ink-2); vertical-align: middle; }
.badge.good { background: var(--good-bg); color: var(--good); border-color: var(--good-line); }
.badge.bad { background: var(--bad-bg); color: var(--bad); border-color: var(--bad-line); }
.badge.warn { background: var(--warn-bg); color: var(--warn); border-color: var(--warn-line); }
.badge.info { background: var(--info-bg); color: var(--info); border-color: var(--brand-tint-2); }
.badge.easy { background: var(--good-bg); color: var(--good); border-color: var(--good-line); }
.badge.medium { background: var(--warn-bg); color: var(--warn); border-color: var(--warn-line); }
.badge.hard { background: var(--bad-bg); color: var(--bad); border-color: var(--bad-line); }
.stats { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; margin-bottom: 14px; }
@media (min-width: 720px) { .stats { grid-template-columns: repeat(4, 1fr); } }
.stat { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); padding: 14px; text-decoration: none; color: var(--ink); display: flex; flex-direction: column; justify-content: space-between; gap: 6px; }
.stat strong { font: 700 1.6rem/1.1 var(--sans); font-variant-numeric: tabular-nums; letter-spacing: -0.02em; color: var(--brand-strong); }
.stat span { color: var(--muted); font-size: 0.82rem; line-height: 1.35; font-weight: 500; }
.qlist { list-style: none; padding: 0; margin: 0; }
.qlist > li { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); padding: 14px; margin-bottom: 10px; }
.qlist > li > a { text-decoration: none; color: var(--ink); display: block; }
.qid { color: var(--muted); font: 600 0.8rem var(--mono); }
.meta { margin-top: 6px; display: flex; flex-wrap: wrap; gap: 4px; }
.qtext { margin: 8px 0; overflow-x: auto; }
.blank { font-weight: 600; color: var(--brand); white-space: nowrap; }
.math-block { overflow-x: auto; padding: 14px 12px; margin: 10px 0; background: var(--brand-tint); border: 1px solid var(--brand-tint-2); border-radius: var(--radius); color: var(--brand-strong); }
.math-block .katex-display { margin: 0; }
.thumb { max-width: 160px; border-radius: var(--radius-sm); margin-top: 6px; display: block; }
.qimg { max-width: 100%; border-radius: var(--radius); margin: 6px 0; }
.opt-row { display: grid; grid-template-columns: 24px 1fr auto; gap: 8px; align-items: center; }
.opt-letter { font-weight: 700; color: var(--muted); }
.qform fieldset[class*="for-"], .qform div[class*="for-"] { display: none; }
.qform[data-type="single"] .for-single, .qform[data-type="multi"] .for-multi, .qform[data-type="truefalse"] .for-truefalse, .qform[data-type="fill"] .for-fill, .qform[data-type="matching"] .for-matching, .qform[data-type="ordering"] .for-ordering, .qform[data-type="short"] .for-short { display: grid; }
.when-passage-new { display: none; }
.qform.passage-new .when-passage-new { display: grid; gap: 12px; }
.section-card .grid-section { display: grid; grid-template-columns: 1fr; gap: 8px; align-items: center; }
@media (min-width: 640px) { .section-card .grid-section { grid-template-columns: auto 1fr 140px auto auto; } }
.minutes { display: flex; align-items: center; gap: 6px; white-space: nowrap; }
.minutes input { width: 80px; }
.rule-form { display: flex; flex-wrap: wrap; gap: 6px; margin: 8px 0; }
.rule-form input[type="number"] { width: 76px; flex: none; }
.rule-form select { flex: 1 1 130px; width: auto; }
.rules li { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; }
.tabs { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 12px; font-size: 0.95rem; }
.table-wrap { overflow-x: auto; }
table { border-collapse: collapse; width: 100%; font-size: 0.92rem; }
th, td { text-align: left; padding: 8px 6px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font-size: 0.75rem; color: var(--muted); font-weight: 600; letter-spacing: 0.02em; text-transform: uppercase; }
.bars { display: grid; gap: 6px; }
.bar-row { display: grid; grid-template-columns: minmax(80px, 38%) 1fr 48px; gap: 8px; align-items: center; font-size: 0.85rem; }
.bar-label { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.bar-track { background: var(--sunk); border: 1px solid var(--line); border-radius: 999px; height: 10px; overflow: hidden; display: block; }
.bar-fill { background: var(--brand); height: 100%; display: block; border-radius: 999px; }
.bar-fill.bad { background: var(--bad); }
.bar-value { text-align: right; font: 500 0.8rem var(--mono); }
.item.flagged { border-color: var(--bad); box-shadow: 0 0 0 3px var(--bad-bg); }
.picks { display: grid; gap: 4px; margin: 8px 0; }
.pick { display: grid; grid-template-columns: 34px 1fr 92px; gap: 8px; align-items: center; font-size: 0.85rem; }
.pick.key .bar-fill { background: var(--good); }
.pick.suspect .bar-fill { background: var(--bad); }
.pick.suspect .pick-label { color: var(--bad); font-weight: 700; }
.pick-label { font-weight: 600; }
.pick-n { text-align: right; color: var(--muted); font: 0.78rem var(--mono); }
.opts { margin: 4px 0; padding-left: 22px; }
details.fix { margin-top: 8px; }
details.fix summary { cursor: pointer; color: var(--brand-strong); font-weight: 600; }
details.fix form { margin-top: 8px; }
.chart { width: 100%; height: auto; }
.chart .grid { stroke: var(--line); }
.chart .axis { fill: var(--muted); font-size: 10px; }
.chart .line { fill: none; stroke: var(--brand); stroke-width: 2.5; }
.chart .dot { fill: var(--brand); }
.verdict { margin-top: 16px; border-radius: var(--radius); padding: 14px; border: 1px solid var(--line); }
.verdict.valid { background: var(--good-bg); border-color: var(--good-line); }
.verdict.valid h2 { color: var(--good); }
.verdict.revoked { background: var(--bad-bg); border-color: var(--bad-line); }
.verdict.revoked h2 { color: var(--bad); }
.verdict.unknown { background: var(--warn-bg); color: var(--warn); border-color: var(--warn-line); }
.facts { display: grid; grid-template-columns: auto 1fr; gap: 6px 12px; margin: 10px 0 0; }
.facts dt { color: var(--muted); font-size: 0.85rem; }
.facts dd { margin: 0; font-weight: 600; }
.result .big-score { font: 700 2.75rem/1.1 var(--sans); font-variant-numeric: tabular-nums; letter-spacing: -0.02em; color: var(--brand-strong); margin: 0; }
.review .card.correct { border-left: 4px solid var(--good); }
.review .card.wrong { border-left: 4px solid var(--bad); }
.review .card.partial, .review .card.pending { border-left: 4px solid var(--warn); }
.explanation, .comment { background: var(--brand-tint); border-radius: var(--radius-sm); padding: 10px 12px; }
.answer-text { white-space: normal; background: var(--sunk); padding: 12px; border-radius: var(--radius); }
.passage { background: var(--sunk); padding: 12px 14px; border-radius: var(--radius); margin-top: 6px; max-height: 50vh; overflow: auto; }
.meter { height: 6px; background: var(--sunk); border-radius: 999px; overflow: hidden; margin: 8px 0 2px; }
.meter span { display: block; height: 100%; background: var(--brand); }
.rules-list { padding-left: 20px; }
.rules-list li { margin: 4px 0; }
pre.mail { white-space: pre-wrap; word-break: break-word; font: 0.85rem/1.6 var(--mono); background: var(--sunk); padding: 12px; border-radius: var(--radius); }
.mails summary { cursor: pointer; }
.errors { padding-left: 20px; color: var(--bad); }
code { font: 0.88em var(--mono); }
@media (prefers-color-scheme: dark) { button.primary:hover, .button.primary:hover { background: #a5c4ff; border-color: #a5c4ff; } button:hover, .button:hover { border-color: var(--line-strong); } }
.demo-accounts code { margin-left: 6px; }