/* mithian coding.
   Same paper, ink and teal as mithian.net, so it reads as part of the same
   studio. Code always sits on a dark panel, in both themes: it is where the
   work happens, and it should look like a place, not a paragraph. */

/* Fonts are served from this site, not Google, so pages make no requests
   to anyone else (SIL Open Font Licence; see /coding/static/fonts). */
@font-face { font-family: 'Inter'; font-style: normal; font-weight: 400; font-display: swap; src: url('/coding/static/fonts/inter-latin-400-normal.woff2') format('woff2'); }
@font-face { font-family: 'Inter'; font-style: normal; font-weight: 500; font-display: swap; src: url('/coding/static/fonts/inter-latin-500-normal.woff2') format('woff2'); }
@font-face { font-family: 'Inter'; font-style: normal; font-weight: 600; font-display: swap; src: url('/coding/static/fonts/inter-latin-600-normal.woff2') format('woff2'); }
@font-face { font-family: 'Inter'; font-style: normal; font-weight: 700; font-display: swap; src: url('/coding/static/fonts/inter-latin-700-normal.woff2') format('woff2'); }
@font-face { font-family: 'Archivo'; font-style: normal; font-weight: 500; font-display: swap; src: url('/coding/static/fonts/archivo-latin-500-normal.woff2') format('woff2'); }
@font-face { font-family: 'Archivo'; font-style: normal; font-weight: 600; font-display: swap; src: url('/coding/static/fonts/archivo-latin-600-normal.woff2') format('woff2'); }
@font-face { font-family: 'Archivo'; font-style: normal; font-weight: 700; font-display: swap; src: url('/coding/static/fonts/archivo-latin-700-normal.woff2') format('woff2'); }
@font-face { font-family: 'IBM Plex Mono'; font-style: normal; font-weight: 400; font-display: swap; src: url('/coding/static/fonts/ibm-plex-mono-latin-400-normal.woff2') format('woff2'); }
@font-face { font-family: 'IBM Plex Mono'; font-style: normal; font-weight: 500; font-display: swap; src: url('/coding/static/fonts/ibm-plex-mono-latin-500-normal.woff2') format('woff2'); }
@font-face { font-family: 'IBM Plex Mono'; font-style: normal; font-weight: 600; font-display: swap; src: url('/coding/static/fonts/ibm-plex-mono-latin-600-normal.woff2') format('woff2'); }

:root {
  --bg: #f5f4f0;
  --bg-raised: #faf9f6;
  --card: #ffffff;
  --ink: #14181b;
  --soft: #4b545c;
  --faint: #68717a;
  --line: #e0ded6;
  --line-strong: #c9c6bb;
  --tint: #eceae3;
  --accent: #0d6e63;
  --accent-deep: #0a534b;
  --accent-hover: #0a5c53;
  --accent-soft: #e0efec;
  --accent-ink: #ffffff;
  --ok: #12833b;
  --ok-soft: #e8f5ec;
  --ok-line: #b9e0c5;
  --bad: #a8321f;
  --bad-soft: #fcefec;
  --bad-line: #f1c4bb;
  --hint: #8a5b00;
  --hint-soft: #fbf3df;
  --hint-line: #ecd8a6;
  --focus: #0d6e63;
  --shadow-sm: 0 1px 2px rgba(20, 24, 27, 0.06);
  --shadow-md: 0 2px 4px rgba(20, 24, 27, 0.05), 0 10px 24px -14px rgba(20, 24, 27, 0.2);
  --shadow-lg: 0 4px 12px rgba(20, 24, 27, 0.07), 0 26px 50px -26px rgba(20, 24, 27, 0.28);

  /* The workspace: editor, console and code blocks. Dark in both themes. */
  --ed-bg: #15191c;
  --ed-ink: #e6e3dc;
  --ed-gutter-bg: #15191c;
  --ed-gutter-ink: #5c656c;
  --ed-line: #262c31;
  --ed-active: rgba(255, 255, 255, 0.035);
  --ed-selection: rgba(91, 205, 191, 0.24);
  --ed-caret: #5bcdbf;
  --ed-bracket: rgba(91, 205, 191, 0.16);
  --ed-bracket-line: rgba(91, 205, 191, 0.5);
  --ed-error-line: rgba(240, 113, 96, 0.12);
  --ed-chrome: #1c2125;
  --ed-chrome-line: #2a3136;
  --ed-chrome-ink: #aab3b9;
  --con-bg: #0f1214;
  --con-ink: #dcd9d2;
  --con-faint: #8f989f;
  --con-err: #f4a597;
  --con-typed: #7fe0d3;

  --syn-keyword: #eba274;
  --syn-string: #a3d69d;
  --syn-number: #e8c27e;
  --syn-comment: #7b868e;
  --syn-function: #72d6c8;
  --syn-def: #82c4ff;
  --syn-class: #f0c674;
  --syn-operator: #b8c1c7;
  --syn-property: #b9d6ff;
  --syn-punct: #9aa3aa;
  --syn-invalid: #ff8a7a;

  --font-display: 'Archivo', 'Segoe UI', system-ui, sans-serif;
  --font-body: 'Inter', 'Segoe UI', system-ui, sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, 'Cascadia Mono', Consolas, monospace;
  --radius: 6px;
  --radius-sm: 4px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --nav-h: 60px;
  color-scheme: light;
}

:root[data-theme='dark'] {
  --bg: #101315;
  --bg-raised: #13171a;
  --card: #171b1f;
  --ink: #e7e5e0;
  --soft: #a6adb2;
  --faint: #868d93;
  --line: #262b30;
  --line-strong: #353c42;
  --tint: #1b2024;
  --accent: #0d7468;
  --accent-deep: #5bcdbf;
  --accent-hover: #0b665b;
  --accent-soft: rgba(43, 179, 163, 0.14);
  --ok: #4ad08a;
  --ok-soft: rgba(52, 211, 153, 0.09);
  --ok-line: rgba(52, 211, 153, 0.32);
  --bad: #f0a99c;
  --bad-soft: rgba(220, 80, 60, 0.1);
  --bad-line: rgba(220, 80, 60, 0.38);
  --hint: #e6c27a;
  --hint-soft: rgba(230, 180, 80, 0.08);
  --hint-line: rgba(230, 180, 80, 0.3);
  --focus: #5bcdbf;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 2px 4px rgba(0, 0, 0, 0.35), 0 10px 24px -14px rgba(0, 0, 0, 0.6);
  --shadow-lg: 0 4px 12px rgba(0, 0, 0, 0.4), 0 26px 50px -26px rgba(0, 0, 0, 0.7);
  --ed-bg: #0e1113;
  --ed-gutter-bg: #0e1113;
  --ed-line: #1f2428;
  --ed-chrome: #14181b;
  --ed-chrome-line: #232a2f;
  --con-bg: #0a0c0e;
  color-scheme: dark;
}

/* ---------------------------------------------------------------- base */

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.65 var(--font-body);
  -webkit-font-smoothing: antialiased;
}
img, svg { display: block; }
a { color: var(--accent-deep); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { color: var(--accent); }
h1, h2, h3, h4 { font-family: var(--font-display); line-height: 1.15; letter-spacing: -0.02em; margin: 0 0 0.5em; }
h1 { font-size: clamp(2rem, 4.5vw, 3.1rem); font-weight: 700; }
h2 { font-size: clamp(1.45rem, 2.6vw, 1.9rem); font-weight: 700; }
h3 { font-size: 1.2rem; font-weight: 650; }
p { margin: 0 0 1em; }
code, kbd, pre { font-family: var(--font-mono); }
:not(pre) > code {
  font-size: 0.88em;
  background: var(--tint);
  border: 1px solid var(--line);
  border-radius: 3px;
  padding: 0.08em 0.36em;
  white-space: nowrap;
}
kbd {
  font-size: 0.8em;
  border: 1px solid var(--line-strong);
  border-bottom-width: 2px;
  border-radius: 4px;
  padding: 0.05em 0.4em;
  background: var(--card);
}
[hidden] { display: none !important; }
.icon { width: 1.15em; height: 1.15em; flex: none; }
::selection { background: rgba(13, 110, 99, 0.2); }
:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; border-radius: 3px; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--card); padding: 8px 12px; z-index: 100; }
.skip:focus { left: 8px; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.wrap { width: min(1160px, 100% - 32px); margin: 0 auto; }
.narrow { width: min(760px, 100% - 32px); margin: 0 auto; }
.muted { color: var(--soft); }
.faint { color: var(--faint); }
.eyebrow {
  font: 600 0.78rem/1 var(--font-body);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-deep);
  margin: 0 0 0.9rem;
}

/* ------------------------------------------------------------- buttons */

.btn {
  --b-bg: var(--accent);
  --b-ink: var(--accent-ink);
  --b-line: var(--accent);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5em;
  min-height: 42px;
  padding: 0 1.1rem;
  border: 1px solid var(--b-line);
  border-radius: var(--radius-sm);
  background: var(--b-bg);
  color: var(--b-ink);
  font: 600 0.95rem/1 var(--font-body);
  text-decoration: none;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.15s, border-color 0.15s, color 0.15s, transform 0.1s, box-shadow 0.15s;
  user-select: none;
}
.btn:hover { --b-bg: var(--accent-hover); --b-line: var(--accent-hover); color: var(--b-ink); }
.btn:active { transform: translateY(1px); }
.btn:disabled, .btn[aria-disabled='true'] { opacity: 0.45; cursor: not-allowed; transform: none; }
.btn-ghost { --b-bg: transparent; --b-ink: var(--ink); --b-line: var(--line-strong); }
.btn-ghost:hover { --b-bg: var(--tint); --b-line: var(--line-strong); --b-ink: var(--ink); }
.btn-quiet { --b-bg: transparent; --b-ink: var(--soft); --b-line: transparent; padding: 0 0.7rem; }
.btn-quiet:hover { --b-bg: var(--tint); --b-line: transparent; --b-ink: var(--ink); }
.btn-danger { --b-bg: transparent; --b-ink: var(--bad); --b-line: var(--bad-line); }
.btn-danger:hover { --b-bg: var(--bad-soft); --b-line: var(--bad); --b-ink: var(--bad); }
.btn-ok { --b-bg: var(--ok); --b-line: var(--ok); --b-ink: #fff; }
:root[data-theme='dark'] .btn-ok { --b-ink: #08140d; }
.btn-sm { min-height: 34px; padding: 0 0.8rem; font-size: 0.88rem; }
.btn-lg { min-height: 50px; padding: 0 1.5rem; font-size: 1.02rem; }
.btn-block { width: 100%; }

/* ---------------------------------------------------------------- nav */

.cnav {
  position: sticky;
  top: 0;
  z-index: 40;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--line);
}
.cn-inner { height: var(--nav-h); display: flex; align-items: center; gap: 1rem; }
.cn-brand { display: flex; align-items: baseline; gap: 0.45rem; text-decoration: none; color: var(--ink); }
.cn-mark { font: 700 1.3rem/1 var(--font-display); letter-spacing: -0.03em; }
.cn-sub {
  font: 600 0.78rem/1 var(--font-mono);
  color: var(--accent-ink);
  background: var(--accent);
  padding: 0.28rem 0.45rem 0.3rem;
  border-radius: 3px;
  transform: translateY(-2px);
}
.cn-links { margin-left: auto; display: flex; align-items: center; gap: 0.25rem; }
.cn-links > a {
  display: inline-flex; align-items: center; gap: 0.4rem;
  padding: 0.45rem 0.75rem; border-radius: var(--radius-sm);
  color: var(--soft); text-decoration: none; font-weight: 500; font-size: 0.95rem;
}
.cn-links > a:hover { color: var(--ink); background: var(--tint); }
.cn-links > a.on { color: var(--ink); }
.cn-links > a.btn { color: var(--accent-ink); margin-left: 0.25rem; }
.cn-links > a.btn:hover { background: var(--accent-hover); }
.cn-sep { width: 1px; height: 22px; background: var(--line); margin: 0 0.5rem; }
.badge {
  min-width: 20px; height: 20px; padding: 0 6px; border-radius: 10px;
  background: var(--accent); color: var(--accent-ink);
  font: 600 0.72rem/20px var(--font-body); text-align: center;
}
.avatar {
  width: 30px; height: 30px; border-radius: 50%;
  display: inline-grid; place-items: center;
  background: var(--accent-soft); color: var(--accent-deep);
  font: 700 0.85rem/1 var(--font-display);
}
.cn-account { padding-left: 0.4rem !important; }
.cn-name { max-width: 12ch; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.theme-toggle {
  width: 38px; height: 38px; display: inline-grid; place-items: center;
  border: 1px solid var(--line); border-radius: var(--radius-sm);
  background: transparent; color: var(--soft); cursor: pointer; margin-left: 0.25rem;
}
.theme-toggle:hover { color: var(--ink); background: var(--tint); }
.theme-toggle .t-sun { display: none; }
:root[data-theme='dark'] .theme-toggle .t-sun { display: block; }
:root[data-theme='dark'] .theme-toggle .t-moon { display: none; }
.cn-menu {
  display: none; margin-left: auto; width: 42px; height: 42px;
  border: 1px solid var(--line); background: transparent; border-radius: var(--radius-sm);
  color: var(--ink); cursor: pointer; place-items: center;
}

@media (max-width: 860px) {
  .cn-menu { display: inline-grid; }
  .cn-links {
    position: absolute; top: var(--nav-h); left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 0;
    background: var(--bg); border-bottom: 1px solid var(--line);
    padding: 0.5rem 16px 1rem; display: none;
    box-shadow: var(--shadow-md);
  }
  .cn-links.open { display: flex; }
  .cn-links > a { padding: 0.8rem 0.5rem; font-size: 1rem; }
  .cn-links > a.btn { margin: 0.5rem 0 0; }
  .cn-sep { display: none; }
  .theme-toggle { margin: 0.5rem 0 0; width: 100%; }
}

/* ------------------------------------------------------------- footer */

.cfoot { border-top: 1px solid var(--line); margin-top: 5rem; padding: 2rem 0 2.5rem; color: var(--faint); font-size: 0.9rem; }
.cfoot .wrap { display: flex; flex-wrap: wrap; gap: 0.5rem 1.5rem; align-items: center; justify-content: space-between; }
.cfoot a { color: var(--soft); }
.cfoot nav { display: flex; gap: 1.2rem; flex-wrap: wrap; }

/* ------------------------------------------------------------- shared */

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}
.bar { height: 6px; border-radius: 3px; background: var(--tint); overflow: hidden; }
.bar > span { display: block; height: 100%; background: var(--accent); border-radius: 3px; transition: width 0.6s var(--ease); }
.bar.ok > span { background: var(--ok); }
.pill {
  display: inline-flex; align-items: center; gap: 0.35rem;
  font: 600 0.75rem/1 var(--font-body); padding: 0.32rem 0.55rem; border-radius: 999px;
  background: var(--tint); color: var(--soft); white-space: nowrap;
}
.pill.ok { background: var(--ok-soft); color: var(--ok); }
.pill.accent { background: var(--accent-soft); color: var(--accent-deep); }
.pill .icon { width: 0.95em; height: 0.95em; }
.flash {
  padding: 0.8rem 1rem; border-radius: var(--radius-sm); margin: 0 0 1.25rem;
  background: var(--ok-soft); border: 1px solid var(--ok-line); color: var(--ink);
}
.flash.err { background: var(--bad-soft); border-color: var(--bad-line); }
.section { padding: 4.5rem 0; }
.section-head { max-width: 640px; margin-bottom: 2.25rem; }
.section-head p { color: var(--soft); font-size: 1.05rem; }

/* --------------------------------------------------------------- home */

.hero { padding: 4.5rem 0 3.5rem; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr); gap: 3.5rem; align-items: center; }
.hero h1 { font-size: clamp(2.3rem, 5vw, 3.6rem); letter-spacing: -0.035em; margin-bottom: 1.1rem; }
.hero h1 em { font-style: normal; color: var(--accent-deep); }
.hero-lede { font-size: 1.15rem; color: var(--soft); max-width: 34rem; margin-bottom: 1.8rem; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 0.75rem; align-items: center; }
.hero-note { margin-top: 1.1rem; color: var(--faint); font-size: 0.9rem; display: flex; gap: 1.2rem; flex-wrap: wrap; }
.hero-note span { display: inline-flex; align-items: center; gap: 0.4rem; }
.hero-note .icon { color: var(--ok); }

.demo {
  border-radius: 10px; overflow: hidden; background: var(--ed-bg);
  box-shadow: var(--shadow-lg); border: 1px solid #000;
}
:root:not([data-theme='dark']) .demo { border-color: #1f2427; }
.demo-bar {
  display: flex; align-items: center; gap: 0.6rem; padding: 0.55rem 0.7rem 0.55rem 0.9rem;
  background: var(--ed-chrome); border-bottom: 1px solid var(--ed-chrome-line); color: var(--ed-chrome-ink);
  font: 500 0.82rem/1 var(--font-mono);
}
.demo-dots { display: flex; gap: 6px; margin-right: 0.4rem; }
.demo-dots i { width: 10px; height: 10px; border-radius: 50%; background: #3a4146; }
.demo-bar .btn { margin-left: auto; min-height: 32px; font-size: 0.85rem; }
.demo-editor { height: 220px; }
.demo-console { height: 150px; border-top: 1px solid var(--ed-chrome-line); }
.demo-caption { color: var(--faint); font-size: 0.88rem; margin-top: 0.8rem; text-align: center; }

.method { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; }
.method-item { padding: 1.4rem 1.3rem 1.5rem; }
.method-item .num {
  font: 700 0.8rem/1 var(--font-mono); color: var(--accent-deep);
  display: inline-block; margin-bottom: 0.9rem; padding: 0.3rem 0.45rem; border-radius: 3px; background: var(--accent-soft);
}
.method-item h3 { margin-bottom: 0.4rem; }
.method-item p { color: var(--soft); font-size: 0.95rem; margin: 0; }

.parts { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1rem; }
.part-card { padding: 1.5rem; display: flex; flex-direction: column; }
.part-card .part-n { font: 600 0.78rem/1 var(--font-body); letter-spacing: 0.08em; text-transform: uppercase; color: var(--faint); margin-bottom: 0.6rem; }
.part-card p { color: var(--soft); }
.part-card ol { margin: 0.25rem 0 0; padding: 0; list-style: none; display: grid; gap: 0.1rem; }
.part-card li { display: flex; gap: 0.7rem; align-items: baseline; font-size: 0.95rem; padding: 0.22rem 0; }
.part-card li .u-n { font: 500 0.78rem/1 var(--font-mono); color: var(--faint); width: 1.6rem; flex: none; }
.part-card li.soon { color: var(--faint); }
.part-card .part-foot { margin-top: auto; padding-top: 1rem; }

.faq { display: grid; gap: 0.6rem; max-width: 760px; }
.faq details { padding: 0 1.2rem; }
.faq summary {
  cursor: pointer; list-style: none; padding: 1rem 0; font-weight: 600;
  display: flex; justify-content: space-between; gap: 1rem; align-items: center;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary .icon { transition: transform 0.2s; color: var(--faint); }
.faq details[open] summary .icon { transform: rotate(180deg); }
.faq details p { color: var(--soft); margin: 0 0 1rem; }

/* Dashboard */
.dash { padding: 2.5rem 0 1rem; }
.dash-hello { display: flex; justify-content: space-between; align-items: flex-end; gap: 1rem; flex-wrap: wrap; margin-bottom: 1.75rem; }
.dash-hello h1 { font-size: clamp(1.7rem, 3.5vw, 2.3rem); margin: 0; }
.dash-hello p { margin: 0.35rem 0 0; color: var(--soft); }
.dash-grid { display: grid; grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr); gap: 1rem; }
.continue-card { padding: 1.75rem; display: flex; flex-direction: column; gap: 1rem; position: relative; overflow: hidden; }
.continue-card .cc-unit { color: var(--faint); font-size: 0.9rem; display: flex; gap: 0.5rem; align-items: center; }
.continue-card h2 { margin: 0; font-size: clamp(1.4rem, 2.6vw, 1.8rem); }
.continue-card .cc-summary { color: var(--soft); margin: 0; }
.continue-card .cc-foot { display: flex; align-items: center; gap: 1rem; flex-wrap: wrap; margin-top: 0.25rem; }
.continue-card .cc-meta { color: var(--faint); font-size: 0.9rem; display: flex; gap: 1rem; }
.continue-card .cc-meta span { display: inline-flex; align-items: center; gap: 0.35rem; }
.side-stack { display: grid; gap: 1rem; align-content: start; }
.mini-card { padding: 1.2rem 1.3rem; }
.mini-card h3 { font-size: 1rem; margin-bottom: 0.3rem; display: flex; align-items: center; gap: 0.5rem; }
.mini-card p { color: var(--soft); font-size: 0.93rem; margin: 0 0 0.9rem; }
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; margin-top: 1rem; }
.stat { padding: 1rem 1.2rem; }
.stat .s-label { color: var(--faint); font-size: 0.82rem; display: flex; align-items: center; gap: 0.4rem; }
.stat .s-value { font: 700 1.65rem/1.2 var(--font-display); margin-top: 0.25rem; letter-spacing: -0.02em; }
.stat .s-sub { color: var(--faint); font-size: 0.8rem; }
.week { display: flex; gap: 6px; margin-top: 0.6rem; }
.week span { flex: 1; text-align: center; font-size: 0.72rem; color: var(--faint); }
.week i { display: block; height: 26px; border-radius: 4px; background: var(--tint); margin-bottom: 4px; }
.week i.on { background: var(--accent); }
.week i.today { outline: 2px solid var(--accent-soft); outline-offset: 1px; }
.guest-banner {
  display: flex; gap: 1rem; align-items: center; justify-content: space-between; flex-wrap: wrap;
  padding: 0.9rem 1.1rem; margin-bottom: 1.5rem; border-radius: var(--radius);
  background: var(--accent-soft); border: 1px solid color-mix(in srgb, var(--accent) 25%, transparent);
}
.guest-banner p { margin: 0; }
.progress-parts { display: grid; gap: 0.8rem; margin-top: 1rem; }
.pp-row { display: grid; grid-template-columns: 11rem 1fr 4rem; gap: 1rem; align-items: center; font-size: 0.92rem; }
.pp-row .pp-pct { text-align: right; color: var(--faint); font-variant-numeric: tabular-nums; }

/* -------------------------------------------------------------- course */

.course-head { padding: 3rem 0 1rem; }
.course-head p { color: var(--soft); font-size: 1.08rem; max-width: 640px; }
.course-totals { display: flex; gap: 1.5rem; flex-wrap: wrap; color: var(--faint); font-size: 0.92rem; margin-top: 1rem; }
.course-totals span { display: inline-flex; gap: 0.4rem; align-items: center; }
.part-section { margin-top: 3rem; }
.part-section > header { display: grid; grid-template-columns: auto 1fr; gap: 0.2rem 1.25rem; align-items: baseline; margin-bottom: 1.25rem; }
.part-section > header .part-label {
  font: 600 0.78rem/1 var(--font-body); letter-spacing: 0.08em; text-transform: uppercase; color: var(--accent-deep);
  grid-row: span 2; padding-top: 0.55rem;
}
.part-section > header h2 { margin: 0; }
.part-section > header p { color: var(--soft); margin: 0; }
.units { display: grid; gap: 0.6rem; }
.unit { overflow: hidden; }
.unit-head {
  display: grid; grid-template-columns: 2.6rem minmax(0, 1fr) auto; gap: 1rem; align-items: center;
  padding: 1rem 1.2rem; cursor: pointer; width: 100%; text-align: left;
  background: none; border: 0; color: inherit; font: inherit;
}
.unit-head:hover { background: var(--bg-raised); }
.unit-num {
  width: 2.6rem; height: 2.6rem; border-radius: 50%; display: grid; place-items: center;
  border: 1.5px solid var(--line-strong); font: 600 0.95rem/1 var(--font-mono); color: var(--soft);
  background: var(--card);
}
.unit.is-done .unit-num { background: var(--ok); border-color: var(--ok); color: #fff; }
.unit.is-active .unit-num { border-color: var(--accent); color: var(--accent-deep); box-shadow: 0 0 0 4px var(--accent-soft); }
.unit.is-locked .unit-num { color: var(--faint); border-style: dashed; }
.unit.is-soon { opacity: 0.72; }
.unit.is-soon .unit-head { cursor: default; }
.unit-title { display: block; font: 650 1.08rem/1.3 var(--font-display); margin: 0; }
.unit-sum { display: block; color: var(--soft); font-size: 0.92rem; margin: 0.15rem 0 0; }
.unit-meta { display: flex; align-items: center; gap: 0.75rem; color: var(--faint); font-size: 0.85rem; }
.unit-meta .bar { width: 90px; }
.unit-meta .chev { transition: transform 0.2s var(--ease); }
.unit.open .unit-meta .chev { transform: rotate(180deg); }
.unit-body { border-top: 1px solid var(--line); padding: 0.5rem 1.2rem 1.2rem 4.8rem; display: none; }
.unit.open .unit-body { display: block; }
.unit-goals { color: var(--soft); font-size: 0.92rem; margin: 0.6rem 0 0.9rem; padding-left: 1.1rem; }
.unit-goals li { margin: 0.15rem 0; }
.lessons { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.1rem; }
.lessons a {
  display: grid; grid-template-columns: 1.6rem minmax(0, 1fr) auto; gap: 0.75rem; align-items: center;
  padding: 0.6rem 0.75rem; border-radius: var(--radius-sm); text-decoration: none; color: var(--ink);
}
.lessons a:hover { background: var(--tint); }
.l-dot {
  width: 1.4rem; height: 1.4rem; border-radius: 50%; border: 1.5px solid var(--line-strong);
  display: grid; place-items: center; color: transparent;
}
.l-dot .icon { width: 0.85rem; height: 0.85rem; stroke-width: 3; }
.lessons li.done .l-dot { background: var(--ok); border-color: var(--ok); color: #fff; }
.lessons li.part .l-dot { border-color: var(--accent); background: conic-gradient(var(--accent) var(--p, 0%), transparent 0); }
.l-title { font-weight: 500; }
.l-kind { font-size: 0.75rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.06em; color: var(--accent-deep); margin-left: 0.5rem; }
.l-min { color: var(--faint); font-size: 0.85rem; }
.unit-lock-note {
  display: flex; gap: 0.75rem; align-items: center; flex-wrap: wrap;
  margin: 0.8rem 0 0.4rem; padding: 0.75rem 0.9rem; border-radius: var(--radius-sm);
  background: var(--tint); color: var(--soft); font-size: 0.92rem;
}
.unit-lock-note .icon { color: var(--faint); }
.unit-topics { display: flex; flex-wrap: wrap; gap: 0.4rem; margin: 0.8rem 0 0.2rem; }

/* -------------------------------------------------------------- forms */

.auth { padding: 3.5rem 0; }
.auth-card { width: min(440px, 100%); margin: 0 auto; padding: 2rem; }
.auth-card h1 { font-size: 1.75rem; margin-bottom: 0.4rem; }
.auth-card > p { color: var(--soft); }
.field { display: grid; gap: 0.35rem; margin-bottom: 1rem; }
.field label { font-weight: 600; font-size: 0.92rem; }
.field .help { color: var(--faint); font-size: 0.82rem; }
.input {
  width: 100%; min-height: 44px; padding: 0.55rem 0.8rem; font: inherit; color: var(--ink);
  background: var(--card); border: 1px solid var(--line-strong); border-radius: var(--radius-sm);
}
.input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.pw-wrap { position: relative; }
.pw-wrap .input { padding-right: 4.5rem; }
.pw-toggle {
  position: absolute; right: 6px; top: 50%; transform: translateY(-50%);
  border: 0; background: none; color: var(--soft); font: 600 0.82rem/1 var(--font-body); cursor: pointer; padding: 0.5rem;
}
.auth-alt { text-align: center; color: var(--soft); font-size: 0.93rem; margin-top: 1.2rem; }
.form-note { color: var(--faint); font-size: 0.85rem; margin-top: 1rem; }
.account-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.account-grid .card { padding: 1.5rem; }
.account-grid h2 { font-size: 1.15rem; }
.account-grid .danger { border-color: var(--bad-line); }
.pref-row { display: flex; justify-content: space-between; align-items: center; gap: 1rem; padding: 0.7rem 0; border-top: 1px solid var(--line); }
.pref-row:first-of-type { border-top: 0; }
.pref-row label { font-weight: 500; }
.pref-row .help { color: var(--faint); font-size: 0.82rem; display: block; font-weight: 400; }
select.input { width: auto; min-height: 38px; }
.switch { position: relative; width: 44px; height: 26px; flex: none; }
.switch input { position: absolute; inset: 0; opacity: 0; cursor: pointer; margin: 0; }
.switch span { position: absolute; inset: 0; border-radius: 13px; background: var(--line-strong); transition: background 0.2s; pointer-events: none; }
.switch span::after { content: ''; position: absolute; width: 20px; height: 20px; left: 3px; top: 3px; border-radius: 50%; background: #fff; transition: transform 0.2s var(--ease); box-shadow: var(--shadow-sm); }
.switch input:checked + span { background: var(--accent); }
.switch input:checked + span::after { transform: translateX(18px); }
.switch input:focus-visible + span { outline: 2px solid var(--focus); outline-offset: 2px; }

/* ===================================================== lesson player */

body.lesson-page {
  height: 100dvh;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  overflow: hidden;
}
.lbar {
  display: grid; grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr); gap: 1rem; align-items: center;
  height: 56px; padding: 0 1rem; border-bottom: 1px solid var(--line); background: var(--bg);
}
.lbar-left { display: flex; align-items: center; gap: 0.6rem; min-width: 0; }
.lbar-back {
  display: inline-flex; align-items: center; gap: 0.45rem; color: var(--soft); text-decoration: none;
  font-size: 0.9rem; padding: 0.4rem 0.55rem; border-radius: var(--radius-sm); min-width: 0;
}
.lbar-back:hover { background: var(--tint); color: var(--ink); }
.lbar-back span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.lbar-title { font: 650 0.98rem/1.2 var(--font-display); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; min-width: 0; padding-left: 0.6rem; border-left: 1px solid var(--line); }
.steps-rail { display: flex; align-items: center; gap: 5px; }
.steps-rail button {
  width: 26px; height: 24px; border: 0; padding: 0; cursor: pointer; background: transparent;
  display: grid; place-items: center; --bar: var(--line-strong);
}
.steps-rail button::before {
  content: ''; width: 100%; height: 8px; border-radius: 4px; background: var(--bar);
  transition: background 0.2s, transform 0.2s;
}
.steps-rail button:hover::before { transform: scaleY(1.4); }
.steps-rail button.done { --bar: var(--ok); }
.steps-rail button.miss { --bar: var(--hint); }
.steps-rail button.current { --bar: var(--accent); }
.steps-rail button.current::before { box-shadow: 0 0 0 3px var(--accent-soft); }
.steps-rail button:focus-visible { outline: 2px solid var(--focus); outline-offset: 1px; border-radius: 4px; }
.steps-rail button:disabled { cursor: default; }
.steps-rail button:disabled::before { transform: none; }
.lbar-right { display: flex; justify-content: flex-end; align-items: center; gap: 0.4rem; }
.lbar-right .theme-toggle { margin: 0; }
.save-status { font-size: 0.8rem; color: var(--hint); }

.stage { overflow: auto; position: relative; }
.stage:focus { outline: none; }
.lfoot {
  display: flex; align-items: center; gap: 0.75rem; justify-content: space-between;
  padding: 0.7rem 1rem; border-top: 1px solid var(--line); background: var(--bg);
}
.lfoot-status { color: var(--faint); font-size: 0.88rem; text-align: center; flex: 1; }
.lfoot .btn { min-width: 120px; }

.step-enter { animation: stepIn 0.35s var(--ease); }
@keyframes stepIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }
@media (prefers-reduced-motion: reduce) { .step-enter { animation: none; } * { scroll-behavior: auto !important; } }

/* Reading */
.read { width: min(740px, 100% - 32px); margin: 0 auto; padding: 2.5rem 0 3rem; }
.step-kicker { display: flex; align-items: center; gap: 0.5rem; color: var(--accent-deep); font: 600 0.78rem/1 var(--font-body); letter-spacing: 0.08em; text-transform: uppercase; margin-bottom: 0.8rem; }
.step-kicker .icon { width: 1rem; height: 1rem; }
.read h2 { font-size: clamp(1.6rem, 3vw, 2.1rem); margin-bottom: 1rem; }
.prose { font-size: 1.04rem; }
.prose p, .prose li { color: var(--ink); }
.prose ul, .prose ol { padding-left: 1.3rem; margin: 0 0 1em; }
.prose li { margin: 0.3rem 0; }
.prose h3 { margin-top: 1.8rem; }
.prose strong { font-weight: 650; }
.prose blockquote { margin: 1.2rem 0; padding: 0.2rem 1.1rem; border-left: 3px solid var(--line-strong); color: var(--soft); }
.code-block, .out-block {
  margin: 1rem 0 1.25rem; padding: 0.95rem 1.1rem; border-radius: var(--radius);
  background: var(--ed-bg); color: var(--ed-ink); overflow-x: auto;
  font-size: 0.92rem; line-height: 1.6; border: 1px solid var(--ed-line);
}
.out-block { background: var(--card); color: var(--ink); border: 1px dashed var(--line-strong); position: relative; padding-top: 1.6rem; }
.out-block::before {
  content: 'Output'; position: absolute; top: 0.45rem; left: 1.1rem;
  font: 600 0.68rem/1 var(--font-body); letter-spacing: 0.08em; text-transform: uppercase; color: var(--faint);
}
.code-block .k, .numbered-code .k { color: var(--syn-keyword); }
.code-block .c, .numbered-code .c { color: var(--syn-number); }
.code-block .s, .numbered-code .s { color: var(--syn-string); }
.code-block .n, .numbered-code .n { color: var(--syn-number); }
.code-block .m, .numbered-code .m { color: var(--syn-comment); font-style: italic; }
.code-block .b, .code-block .f, .numbered-code .b, .numbered-code .f { color: var(--syn-function); }
.code-block .d, .numbered-code .d { color: var(--syn-def); }
.code-block .o, .numbered-code .o { color: var(--syn-operator); }
.table-wrap { overflow-x: auto; margin: 1rem 0 1.4rem; }
.prose table { border-collapse: collapse; width: 100%; font-size: 0.95rem; }
.prose th, .prose td { text-align: left; padding: 0.55rem 0.8rem; border-bottom: 1px solid var(--line); }
.prose th { font-weight: 600; color: var(--soft); font-size: 0.85rem; }
.callout { margin: 1.4rem 0; padding: 1rem 1.2rem; border-radius: var(--radius); background: var(--card); border: 1px solid var(--line); border-left: 4px solid var(--accent); }
.callout > :last-child { margin-bottom: 0; }
.callout-title { font-weight: 700; font-family: var(--font-display); margin-bottom: 0.4rem !important; }
.callout-tip { border-left-color: var(--ok); }
.callout-warn { border-left-color: var(--bad); }
.callout-try { border-left-color: var(--hint); }
.callout ol, .callout ul { margin-bottom: 0; }

/* Runnable examples */
.example { margin: 1.1rem 0 1.5rem; border-radius: var(--radius); overflow: hidden; border: 1px solid var(--ed-line); background: var(--ed-bg); }
.example .code-block { margin: 0; border: 0; border-radius: 0; }
.example .ex-editor { min-height: 60px; }
.ex-bar {
  display: flex; align-items: center; gap: 0.4rem; padding: 0.45rem 0.55rem;
  background: var(--ed-chrome); border-top: 1px solid var(--ed-chrome-line);
}
.ex-bar .btn { min-height: 32px; font-size: 0.85rem; padding: 0 0.75rem; }
.ex-bar .btn-ghost, .ws-bar .btn-ghost { --b-ink: var(--ed-chrome-ink); --b-line: var(--ed-chrome-line); }
.ex-bar .btn-ghost:hover, .ws-bar .btn-ghost:hover { --b-bg: rgba(255, 255, 255, 0.06); --b-ink: #fff; }
.ex-bar .ex-hint { margin-left: auto; color: var(--con-faint); font-size: 0.78rem; }
.example .console { max-height: 260px; min-height: 0; border-top: 1px solid var(--ed-chrome-line); }
.example .console:empty { display: none; }

/* The console */
.console {
  background: var(--con-bg); color: var(--con-ink); overflow: auto;
  font: 0.9rem/1.55 var(--font-mono); padding: 0.85rem 1rem;
}
.con-out { margin: 0; white-space: pre-wrap; word-break: break-word; font: inherit; }
.con-placeholder, .con-quiet, .con-note { color: var(--con-faint); font-style: italic; }
.con-stopped { color: var(--hint); font-style: normal; }
.con-stderr { color: var(--con-err); }
.con-typed { color: var(--con-typed); }
.con-input-wrap { display: inline-flex; align-items: center; gap: 0.5rem; vertical-align: baseline; }
.con-input {
  font: inherit; color: var(--con-typed); background: rgba(91, 205, 191, 0.08);
  border: 0; border-bottom: 1.5px solid var(--con-typed); outline: none;
  padding: 0 0.25rem; min-width: 12ch; caret-color: var(--con-typed);
}
.con-input-hint { color: var(--con-faint); font-size: 0.75rem; }
.err-card {
  margin-top: 0.75rem; padding: 0.8rem 0.95rem; border-radius: var(--radius-sm);
  background: rgba(240, 113, 96, 0.08); border: 1px solid rgba(240, 113, 96, 0.3); border-left: 3px solid #f07160;
  font-family: var(--font-body); font-size: 0.92rem; color: var(--con-ink); white-space: normal;
}
.err-head { display: flex; align-items: center; gap: 0.55rem; flex-wrap: wrap; }
.err-head strong { color: #ffb4a7; font-weight: 650; }
.err-icon {
  width: 1.25rem; height: 1.25rem; border-radius: 50%; background: #f07160; color: #1a0c09;
  display: inline-grid; place-items: center; font: 800 0.8rem/1 var(--font-body); flex: none;
}
.err-line {
  margin-left: auto; border: 1px solid rgba(240, 113, 96, 0.4); background: transparent; color: #ffb4a7;
  border-radius: 3px; font: 600 0.75rem/1 var(--font-mono); padding: 0.3rem 0.45rem; cursor: pointer;
}
.err-line:hover { background: rgba(240, 113, 96, 0.15); }
.err-explain { margin: 0.45rem 0 0; line-height: 1.55; }
.err-trace { margin-top: 0.55rem; }
.err-trace summary { cursor: pointer; color: var(--con-faint); font-size: 0.82rem; }
.err-trace pre { margin: 0.5rem 0 0; font: 0.82rem/1.5 var(--font-mono); color: var(--con-err); white-space: pre-wrap; }

/* Exercise layout */
.ex-grid {
  display: grid; height: 100%;
  grid-template-columns: minmax(320px, 0.82fr) minmax(0, 1.18fr);
  grid-template-areas: 'task work' 'feedback work';
  grid-template-rows: minmax(0, 1fr) auto;
}
.ex-task { grid-area: task; overflow: auto; padding: 1.75rem 1.75rem 1rem; border-right: 1px solid var(--line); }
.ex-feedback { grid-area: feedback; padding: 0 1.75rem 1.5rem; border-right: 1px solid var(--line); overflow: auto; max-height: 55vh; }
.ex-feedback:empty { display: none; }
.ex-task h2 { font-size: 1.5rem; margin-bottom: 0.9rem; }
.ex-task .prose { font-size: 1rem; }
.ex-task .out-block, .ex-task .code-block { font-size: 0.88rem; }
/* Only the lesson's exercise grid has a "work" area. Anywhere else (the
   playground) a named area that doesn't exist sends the panel into an extra
   grid track at the bottom right, so the placement is scoped. */
.ex-grid > .workspace { grid-area: work; }
.workspace { display: grid; grid-template-rows: minmax(160px, 1fr) auto minmax(110px, 38%); background: var(--ed-bg); min-height: 0; }
.ws-editor { min-height: 0; overflow: hidden; }
.ws-editor .cm-editor { height: 100%; }
.ws-bar {
  display: flex; align-items: center; gap: 0.45rem; padding: 0.5rem 0.6rem;
  background: var(--ed-chrome); border-top: 1px solid var(--ed-chrome-line); border-bottom: 1px solid var(--ed-chrome-line);
}
.ws-bar .btn { min-height: 36px; font-size: 0.88rem; }
.ws-bar .spacer { flex: 1; }
.ws-bar .kbd-hint { color: var(--con-faint); font-size: 0.75rem; }
.ws-bar .kbd-hint kbd { background: transparent; color: var(--con-faint); border-color: var(--ed-chrome-line); }
.workspace .console { min-height: 0; }
.btn-run { --b-bg: #2a3238; --b-line: #3a444b; --b-ink: #f2f0ea; }
.btn-run:hover { --b-bg: #333d44; --b-line: #46525a; --b-ink: #fff; }
.btn-run.is-running { --b-bg: #5a2a22; --b-line: #7a3a2f; }
.btn-run .i-stop { display: none; }
.btn-run.is-running .i-play { display: none; }
.btn-run.is-running .i-stop { display: block; }
.py-status { color: var(--con-faint); font-size: 0.78rem; display: inline-flex; align-items: center; gap: 0.4rem; }
.py-status::before { content: ''; width: 7px; height: 7px; border-radius: 50%; background: #5d666d; }
.py-status[data-s='loading']::before { background: var(--hint); animation: pulse 1s infinite; }
.py-status[data-s='ready']::before, .py-status[data-s='busy']::before { background: #4ad08a; }
.py-status[data-s='failed']::before { background: #f07160; }
@keyframes pulse { 50% { opacity: 0.3; } }

.hints { margin: 1.2rem 0 0; display: grid; gap: 0.5rem; }
.hint {
  padding: 0.7rem 0.9rem; border-radius: var(--radius-sm); background: var(--hint-soft);
  border: 1px solid var(--hint-line); font-size: 0.94rem;
}
.hint b { color: var(--hint); font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.06em; display: block; margin-bottom: 0.15rem; }
.task-actions { display: flex; gap: 0.5rem; flex-wrap: wrap; margin-top: 1.1rem; }
.task-actions .btn { min-height: 36px; font-size: 0.88rem; }
.solution { margin-top: 1rem; }
.solution .code-block { margin: 0.5rem 0; }

.result {
  border-radius: var(--radius); padding: 1rem 1.1rem; margin-top: 1rem;
  border: 1px solid var(--line); background: var(--card);
}
.result.pass { border-color: var(--ok-line); background: var(--ok-soft); }
.result.fail { border-color: var(--bad-line); background: var(--bad-soft); }
.result-head { display: flex; align-items: center; gap: 0.6rem; font: 650 1.05rem/1.3 var(--font-display); margin-bottom: 0.35rem; }
.result.pass .result-head { color: var(--ok); }
.result.fail .result-head { color: var(--bad); }
.result-head .icon { width: 1.4rem; height: 1.4rem; }
.result > p { margin: 0 0 0.5rem; }
.checks { list-style: none; margin: 0.6rem 0 0; padding: 0; display: grid; gap: 0.45rem; }
.checks li { display: grid; grid-template-columns: 1.2rem 1fr; gap: 0.55rem; font-size: 0.93rem; }
.checks li .icon { width: 1.1rem; height: 1.1rem; margin-top: 0.2rem; stroke-width: 2.5; }
.checks li.ok .icon { color: var(--ok); }
.checks li.no .icon { color: var(--bad); }
.checks .c-msg { color: var(--soft); display: block; margin-top: 0.1rem; }
.diff { display: grid; grid-template-columns: 1fr 1fr; gap: 0.5rem; margin-top: 0.5rem; }
.diff > div { min-width: 0; }
.diff b { font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--faint); }
.diff pre {
  margin: 0.2rem 0 0; padding: 0.5rem 0.65rem; border-radius: var(--radius-sm); background: var(--card);
  border: 1px solid var(--line); font-size: 0.82rem; white-space: pre-wrap; word-break: break-word; max-height: 160px; overflow: auto;
}
.result .err-card { background: var(--card); color: var(--ink); border-color: var(--bad-line); border-left-color: var(--bad); }
.result .err-card .err-head strong { color: var(--bad); }
.result .err-card .err-line { color: var(--bad); border-color: var(--bad-line); }
.result .err-card .err-trace pre { color: var(--bad); }
.result .err-card .err-trace summary { color: var(--faint); }

/* Question cards (quiz, predict, parsons) */
.qcard { width: min(760px, 100% - 32px); margin: 0 auto; padding: 2.75rem 0 3rem; }
.qcard h2 { font-size: clamp(1.35rem, 2.6vw, 1.75rem); margin-bottom: 1rem; }
.qcard .q-code { margin: 0 0 1.4rem; }
.options { display: grid; gap: 0.6rem; margin: 1.2rem 0 0; }
.option {
  display: grid; grid-template-columns: 2rem minmax(0, 1fr) auto; gap: 0.85rem; align-items: center;
  width: 100%; text-align: left; padding: 0.85rem 1rem; border-radius: var(--radius);
  background: var(--card); border: 1.5px solid var(--line); color: var(--ink); font: inherit; cursor: pointer;
  transition: border-color 0.15s, background 0.15s, transform 0.1s;
}
.option:hover:not(:disabled) { border-color: var(--line-strong); background: var(--bg-raised); }
.option:active:not(:disabled) { transform: scale(0.995); }
.option .o-key {
  width: 2rem; height: 2rem; border-radius: var(--radius-sm); display: grid; place-items: center;
  border: 1px solid var(--line-strong); font: 600 0.85rem/1 var(--font-mono); color: var(--soft);
}
.option .o-text { min-width: 0; }
.option .o-text pre { margin: 0; font: 0.92rem/1.5 var(--font-mono); white-space: pre-wrap; word-break: break-word; }
.option .o-mark { width: 1.3rem; height: 1.3rem; }
.option.selected { border-color: var(--accent); background: var(--accent-soft); }
.option.selected .o-key { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.option.right { border-color: var(--ok); background: var(--ok-soft); }
.option.right .o-key { background: var(--ok); border-color: var(--ok); color: #fff; }
.option.wrong { border-color: var(--bad); background: var(--bad-soft); }
.option.wrong .o-key { background: var(--bad); border-color: var(--bad); color: #fff; }
.option:disabled { cursor: default; }
.option.dim { opacity: 0.55; }
.option .o-feedback { grid-column: 2 / 4; color: var(--soft); font-size: 0.9rem; margin-top: -0.2rem; }
.multi-note { color: var(--faint); font-size: 0.9rem; margin: 0.8rem 0 0; }
.q-explain {
  margin-top: 1.2rem; padding: 1rem 1.15rem; border-radius: var(--radius);
  background: var(--card); border: 1px solid var(--line); border-left: 4px solid var(--accent);
}
.q-explain.ok { border-left-color: var(--ok); }
.q-explain.no { border-left-color: var(--bad); }
.q-explain p { margin: 0; }
.q-explain .q-verdict { font: 650 1.05rem/1.3 var(--font-display); margin-bottom: 0.3rem; display: flex; gap: 0.5rem; align-items: center; }
.q-explain.ok .q-verdict { color: var(--ok); }
.q-explain.no .q-verdict { color: var(--bad); }
.q-actions { display: flex; gap: 0.6rem; margin-top: 1.1rem; flex-wrap: wrap; }
.q-run { margin-top: 1rem; border-radius: var(--radius); overflow: hidden; border: 1px solid var(--ed-line); }
.q-run .console { min-height: 64px; max-height: 260px; }
.answer-box {
  width: 100%; min-height: 96px; font: 0.95rem/1.5 var(--font-mono); padding: 0.75rem 0.9rem;
  border-radius: var(--radius); border: 1.5px solid var(--line-strong); background: var(--card); color: var(--ink); resize: vertical;
}
.answer-box:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }

/* Parsons */
.parsons { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin-top: 1.2rem; }
.p-zone { border-radius: var(--radius); border: 1.5px dashed var(--line-strong); padding: 0.6rem; min-height: 200px; background: var(--bg-raised); }
.p-zone.target { border-style: solid; border-color: var(--line-strong); background: var(--card); }
.p-zone.drag-over { border-color: var(--accent); background: var(--accent-soft); }
.p-label { font: 600 0.72rem/1 var(--font-body); letter-spacing: 0.08em; text-transform: uppercase; color: var(--faint); padding: 0.3rem 0.3rem 0.6rem; display: flex; justify-content: space-between; }
.p-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.4rem; min-height: 40px; }
.p-line {
  display: flex; align-items: center; gap: 0.5rem; padding: 0.55rem 0.65rem; border-radius: var(--radius-sm);
  background: var(--ed-bg); color: var(--ed-ink); font: 0.9rem/1.4 var(--font-mono);
  cursor: grab; user-select: none; touch-action: none; border: 1.5px solid transparent;
  white-space: pre; overflow-x: auto;
}
.p-line .icon { color: var(--ed-gutter-ink); width: 1rem; height: 1rem; }
.p-line:hover { border-color: var(--accent); }
.p-line:focus-visible { outline: 2px solid var(--focus); outline-offset: 1px; }
.p-line.dragging { opacity: 0.4; }
.p-line.bad { border-color: var(--bad); }
.p-line.good { border-color: var(--ok); }
.p-ghost { position: fixed; pointer-events: none; z-index: 100; box-shadow: var(--shadow-lg); opacity: 0.95; cursor: grabbing; }
.p-placeholder { height: 38px; border-radius: var(--radius-sm); border: 1.5px dashed var(--accent); background: var(--accent-soft); }
.p-help { color: var(--faint); font-size: 0.85rem; margin-top: 0.8rem; }

/* Lesson end and gates */
.finish { width: min(620px, 100% - 32px); margin: 0 auto; padding: 3.5rem 0; text-align: center; }
.finish-badge {
  width: 84px; height: 84px; border-radius: 50%; margin: 0 auto 1.4rem; display: grid; place-items: center;
  background: var(--ok); color: #fff; box-shadow: 0 0 0 10px var(--ok-soft);
  animation: pop 0.5s var(--ease);
}
.finish-badge.fail { background: var(--hint); box-shadow: 0 0 0 10px var(--hint-soft); }
.finish-badge .icon { width: 42px; height: 42px; stroke-width: 2.5; }
@keyframes pop { 0% { transform: scale(0.6); opacity: 0; } 70% { transform: scale(1.06); } 100% { transform: none; opacity: 1; } }
.finish h2 { font-size: clamp(1.7rem, 3.4vw, 2.3rem); }
.finish > p { color: var(--soft); font-size: 1.05rem; }
.finish-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0.75rem; margin: 1.8rem 0; }
.finish-stats div { padding: 1rem 0.5rem; }
.finish-stats b { display: block; font: 700 1.6rem/1.2 var(--font-display); }
.finish-stats span { color: var(--faint); font-size: 0.85rem; }
.finish-actions { display: flex; gap: 0.75rem; justify-content: center; flex-wrap: wrap; }
.finish-next { margin-top: 1.5rem; padding: 1.1rem 1.25rem; text-align: left; display: flex; align-items: center; gap: 1rem; justify-content: space-between; flex-wrap: wrap; }
.finish-next small { color: var(--faint); display: block; }
.finish-next strong { font-family: var(--font-display); font-size: 1.08rem; }
.review-list { text-align: left; margin: 1.2rem auto 0; max-width: 460px; }
.gate { width: min(560px, 100% - 32px); margin: 0 auto; padding: 4rem 0; text-align: center; }
.gate .gate-icon { width: 64px; height: 64px; margin: 0 auto 1.2rem; border-radius: 50%; display: grid; place-items: center; background: var(--tint); color: var(--soft); }
.gate .gate-icon .icon { width: 30px; height: 30px; }
.gate p { color: var(--soft); }
.gate-actions { display: grid; gap: 0.6rem; margin-top: 1.5rem; }
.cp-banner {
  display: flex; gap: 0.75rem; align-items: center; justify-content: center; flex-wrap: wrap;
  padding: 0.5rem 1rem; background: var(--accent-soft); color: var(--accent-deep); font-size: 0.88rem; font-weight: 500;
  border-bottom: 1px solid var(--line);
}
.intro { width: min(680px, 100% - 32px); margin: 0 auto; padding: 4rem 0 3rem; }
.intro h1 { font-size: clamp(2rem, 4vw, 2.7rem); }
.intro .lede { color: var(--soft); font-size: 1.12rem; }
.intro-list { list-style: none; padding: 0; margin: 1.6rem 0 2rem; display: grid; gap: 0.5rem; }
.intro-list li { display: flex; gap: 0.7rem; align-items: center; color: var(--soft); }
.intro-list .icon { color: var(--accent-deep); }

/* Practice */
.practice { width: min(760px, 100% - 32px); margin: 0 auto; padding: 2.5rem 0 4rem; }
.practice-top { display: flex; align-items: center; justify-content: space-between; gap: 1rem; margin-bottom: 1rem; }
.practice-top .bar { flex: 1; max-width: 320px; }
.practice .qcard { width: 100%; padding: 1.5rem 0 1rem; }
.practice .q-from { color: var(--faint); font-size: 0.85rem; margin-bottom: 0.4rem; }
.empty { text-align: center; padding: 4rem 1rem; }
.empty .icon-big { width: 64px; height: 64px; margin: 0 auto 1.2rem; border-radius: 50%; display: grid; place-items: center; background: var(--accent-soft); color: var(--accent-deep); }
.empty .icon-big .icon { width: 30px; height: 30px; }
.empty p { color: var(--soft); max-width: 460px; margin-left: auto; margin-right: auto; }

/* Playground */
body.play-page { height: 100dvh; display: grid; grid-template-rows: auto minmax(0, 1fr); overflow: hidden; }
.play { display: grid; grid-template-columns: 250px minmax(0, 1fr); min-height: 0; }
.play-side { border-right: 1px solid var(--line); padding: 1rem; overflow: auto; display: flex; flex-direction: column; gap: 0.75rem; }
.play-side h2 { font-size: 0.78rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--faint); font-family: var(--font-body); font-weight: 600; margin: 0.5rem 0 0; }
.snips { list-style: none; margin: 0; padding: 0; display: grid; gap: 2px; }
.snips button {
  width: 100%; text-align: left; border: 0; background: transparent; color: var(--ink); font: inherit; font-size: 0.92rem;
  padding: 0.5rem 0.6rem; border-radius: var(--radius-sm); cursor: pointer; display: flex; justify-content: space-between; gap: 0.5rem;
}
.snips button:hover { background: var(--tint); }
.snips button.on { background: var(--accent-soft); color: var(--accent-deep); font-weight: 600; }
.snips small { color: var(--faint); font-weight: 400; }
.play-main { display: grid; grid-template-rows: auto minmax(0, 1fr); min-height: 0; }
.play-head { display: flex; gap: 0.5rem; align-items: center; padding: 0.6rem 0.8rem; border-bottom: 1px solid var(--line); flex-wrap: wrap; }
.play-head .input { max-width: 320px; min-height: 36px; font-weight: 600; }
.play-head .spacer { flex: 1; }
.play-main .workspace { grid-template-rows: minmax(160px, 1fr) auto minmax(120px, 36%); }

/* Toasts */
.toasts { position: fixed; bottom: 84px; left: 50%; transform: translateX(-50%); z-index: 200; display: grid; gap: 0.5rem; justify-items: center; pointer-events: none; }
.toast {
  background: var(--ink); color: var(--bg); padding: 0.6rem 1rem; border-radius: var(--radius-sm);
  font-size: 0.9rem; box-shadow: var(--shadow-lg); animation: stepIn 0.25s var(--ease); transition: opacity 0.4s, transform 0.4s;
}
.toast.out { opacity: 0; transform: translateY(6px); }
.toast.ok { background: var(--ok); color: #fff; }

/* ---------------------------------------------------------- responsive */

@media (max-width: 1000px) {
  .hero-grid { grid-template-columns: 1fr; gap: 2.5rem; }
  .method { grid-template-columns: 1fr 1fr; }
  .dash-grid { grid-template-columns: 1fr; }
  .stats { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 900px) {
  /* The lesson scrolls as one page on small screens. */
  body.lesson-page { height: auto; min-height: 100dvh; overflow: visible; display: block; }
  .lbar { position: sticky; top: 0; z-index: 30; grid-template-columns: minmax(0, 1fr) auto; }
  .lbar-title { display: none; }
  .steps-rail { order: 3; grid-column: 1 / -1; justify-content: center; padding-bottom: 0.6rem; }
  .lbar { height: auto; padding-top: 0.5rem; row-gap: 0.4rem; }
  .steps-rail { flex-wrap: wrap; justify-content: center; gap: 2px; }
  .steps-rail button { width: 24px; }
  .stage { overflow: visible; padding-bottom: 76px; }
  .lfoot { position: fixed; bottom: 0; left: 0; right: 0; z-index: 30; padding-bottom: calc(0.7rem + env(safe-area-inset-bottom)); }
  .lfoot .btn { min-width: 0; }
  .lfoot-status { font-size: 0.8rem; }
  .ex-grid { display: block; height: auto; }
  .ex-task { border-right: 0; padding: 1.5rem 16px 1rem; overflow: visible; }
  .ex-feedback { border-right: 0; padding: 0 16px 1.5rem; max-height: none; overflow: visible; }
  .workspace { grid-template-rows: auto auto auto; }
  .ws-editor { height: 46vh; min-height: 240px; }
  .workspace .console { height: 200px; }
  .ex-feedback { order: 3; }
  .ws-bar .kbd-hint { display: none; }
  body.play-page { height: auto; overflow: visible; display: block; }
  .play { display: block; }
  .play-side { border-right: 0; border-bottom: 1px solid var(--line); }
  .play-main .ws-editor { height: 50vh; }
  .play-main .console { height: 220px; }
}

@media (max-width: 700px) {
  body { font-size: 15.5px; }
  .hero { padding: 2.75rem 0 2rem; }
  .section { padding: 3rem 0; }
  .method, .parts { grid-template-columns: 1fr; }
  .stats { grid-template-columns: 1fr 1fr; gap: 0.6rem; }
  .account-grid { grid-template-columns: 1fr; }
  .parsons { grid-template-columns: 1fr; }
  .diff { grid-template-columns: 1fr; }
  .unit-head { grid-template-columns: 2.3rem minmax(0, 1fr); padding: 0.9rem; }
  .unit-num { width: 2.3rem; height: 2.3rem; }
  .unit-meta { grid-column: 2; }
  .unit-body { padding: 0.5rem 0.9rem 1rem; }
  .pp-row { grid-template-columns: 1fr 3rem; }
  .pp-row .bar { grid-column: 1 / -1; grid-row: 2; }
  .part-section > header { grid-template-columns: 1fr; }
  .part-section > header .part-label { grid-row: auto; padding: 0; }
  .finish-stats { grid-template-columns: 1fr 1fr 1fr; gap: 0.4rem; }
  .auth-card { padding: 1.4rem; border: 0; box-shadow: none; background: transparent; }
  .lbar-back span { display: none; }
}

/* Returning learners get the dashboard instead of the introduction. The
   class is set before first paint by theme.js (guests) or the server
   (accounts), so neither flashes. */
#dash { display: none; }
.has-progress #dash, body.signed-in #dash { display: block; }
.has-progress #landing, body.signed-in #landing { display: none; }

/* ================================================================ */
/* Added October 2026: trace tables, bug hunts, challenges, marking, */
/* XP, quests, badges and the profile page.                          */
/* ================================================================ */

/* Avatar colours, picked on the profile page */
.avatar[data-avatar='1'] { background: #e3ecfb; color: #234a8c; }
.avatar[data-avatar='2'] { background: #f6e6f1; color: #8a2f6c; }
.avatar[data-avatar='3'] { background: #fbeedd; color: #8a4a06; }
.avatar[data-avatar='4'] { background: #e6f4e2; color: #2f6b22; }
.avatar[data-avatar='5'] { background: #efe8fb; color: #5a3aa0; }
.avatar[data-avatar='6'] { background: #fde8e4; color: #9a3322; }
.avatar[data-avatar='7'] { background: #2a3136; color: #e7e5e0; }
:root[data-theme='dark'] .avatar[data-avatar='1'] { background: rgba(110, 160, 255, 0.16); color: #a9c6ff; }
:root[data-theme='dark'] .avatar[data-avatar='2'] { background: rgba(230, 110, 190, 0.16); color: #f2a8d8; }
:root[data-theme='dark'] .avatar[data-avatar='3'] { background: rgba(240, 170, 80, 0.16); color: #f2c98c; }
:root[data-theme='dark'] .avatar[data-avatar='4'] { background: rgba(120, 200, 100, 0.16); color: #ade29c; }
:root[data-theme='dark'] .avatar[data-avatar='5'] { background: rgba(160, 130, 240, 0.18); color: #cbb8ff; }
:root[data-theme='dark'] .avatar[data-avatar='6'] { background: rgba(240, 120, 100, 0.16); color: #f5b0a3; }
:root[data-theme='dark'] .avatar[data-avatar='7'] { background: #e7e5e0; color: #14181b; }

/* The level chip in the nav */
.cn-links > a.cn-level {
  gap: 0.35rem; font-size: 0.85rem; font-weight: 600; color: var(--accent-deep);
  padding: 0.3rem 0.65rem; border: 1px solid var(--line); border-radius: 999px; position: relative; overflow: hidden;
}
.cn-level .icon { width: 15px; height: 15px; }
.cn-level::after { content: ''; position: absolute; left: 0; bottom: 0; height: 2px; width: var(--lv, 0%); background: var(--accent); }
.no-rewards .cn-level, .no-rewards .rewards-only { display: none !important; }
.reduce-motion *, .reduce-motion *::before, .reduce-motion *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }

/* Reward toasts */
.toast-reward { display: flex; align-items: center; gap: 0.75rem; padding: 0.75rem 1.1rem 0.75rem 0.8rem; max-width: min(420px, calc(100vw - 32px)); background: var(--card); color: var(--ink); border: 1px solid var(--line); border-left: 4px solid var(--accent); }
.toast-reward strong { display: block; font-size: 0.95rem; }
.toast-reward small { display: block; color: var(--soft); font-size: 0.83rem; line-height: 1.4; }
.toast-icon { width: 36px; height: 36px; border-radius: 50%; display: grid; place-items: center; flex: none; background: var(--accent-soft); color: var(--accent-deep); }

/* Numbered code: trace tables and bug hunts */
.numbered-code {
  margin: 0 0 1rem; padding: 0.6rem 0; border-radius: var(--radius); background: var(--ed-bg);
  border: 1px solid var(--ed-line); font: 0.92rem/1.6 var(--font-mono); color: var(--ed-ink); overflow-x: auto;
}
.nc-line {
  display: grid; grid-template-columns: 3rem minmax(0, 1fr); align-items: baseline; width: 100%;
  padding: 0 1rem 0 0; border: 0; background: transparent; color: inherit; font: inherit; text-align: left;
  border-left: 3px solid transparent; min-height: 1.6em;
}
.nc-line code { white-space: pre; font: inherit; background: none; border: 0; padding: 0; color: inherit; border-radius: 0; }
.nc-n { color: var(--ed-gutter-ink); text-align: right; padding-right: 1rem; user-select: none; font-size: 0.82rem; }
.nc-line.lit { background: rgba(91, 205, 191, 0.1); border-left-color: var(--ed-caret); }
.numbered-code.clickable button.nc-line { cursor: pointer; }
.numbered-code.clickable button.nc-line:hover:not(:disabled) { background: rgba(255, 255, 255, 0.05); }
.numbered-code.clickable button.nc-line:hover:not(:disabled) .nc-n { color: var(--ed-caret); }
.numbered-code.clickable button.nc-line:focus-visible { outline: 2px solid var(--ed-caret); outline-offset: -2px; }
.nc-line:disabled { cursor: default; }
.nc-line.miss { background: rgba(240, 113, 96, 0.08); border-left-color: rgba(240, 113, 96, 0.5); opacity: 0.75; }
.nc-line.bug { background: rgba(240, 113, 96, 0.14); border-left-color: #f07160; }
.nc-line.bug code { text-decoration: line-through; text-decoration-color: rgba(240, 113, 96, 0.8); }
.nc-line.nc-fix { background: rgba(74, 208, 138, 0.12); border-left-color: #4ad08a; }
.nc-line.nc-fix .nc-n { color: #4ad08a; font-weight: 700; }
.bh-compare { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; margin-top: 0.9rem; }
.bh-compare small { display: block; color: var(--faint); font-size: 0.8rem; margin-bottom: 0.3rem; }
.bh-compare .out-block { margin: 0; padding-top: 0.8rem; font-size: 0.85rem; }
.bh-compare .out-block::before { content: none; }

.qcard-wide { width: min(1080px, 100% - 32px); }
.trace-grid { display: grid; grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr); gap: 1.25rem; align-items: start; }
.trace-grid .numbered-code { position: sticky; top: 1rem; margin: 0; }
.trace-wrap { overflow-x: auto; }
.trace-table { border-collapse: separate; border-spacing: 0; width: 100%; font-size: 0.92rem; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); }
.trace-table th, .trace-table td { padding: 0.3rem 0.45rem; border-bottom: 1px solid var(--line); text-align: left; }
.trace-table tr:last-child th, .trace-table tr:last-child td { border-bottom: 0; }
.trace-table thead th { font-size: 0.8rem; color: var(--faint); font-weight: 600; background: var(--bg-raised); }
.trace-table thead th code { font-size: 0.85rem; color: var(--ink); }
.trace-table tbody th { font: 600 0.82rem var(--font-mono); color: var(--faint); width: 3.2rem; }
.trace-table tbody tr:focus-within th, .trace-table tbody tr:hover th { color: var(--accent-deep); }
.trace-same { color: var(--faint); font-family: var(--font-mono); padding-left: 0.9rem !important; }
.trace-in {
  width: 100%; min-width: 5.5rem; font: 0.9rem var(--font-mono); color: var(--ink);
  background: var(--bg-raised); border: 1px solid var(--line-strong); border-radius: var(--radius-sm); padding: 0.35rem 0.5rem;
}
.trace-in:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.trace-in.right { border-color: var(--ok); background: var(--ok-soft); }
.trace-in.wrong { border-color: var(--bad); background: var(--bad-soft); }
.trace-in[readonly] { cursor: default; }

/* Challenges page */
.ch-kinds { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; margin: 1.5rem 0 2rem; }
.ch-kind { display: flex; gap: 0.9rem; padding: 1.1rem 1.2rem; }
.ch-kind h3 { font-size: 1rem; margin: 0 0 0.25rem; }
.ch-kind p { margin: 0; color: var(--soft); font-size: 0.9rem; }
.ch-kind-icon { width: 40px; height: 40px; border-radius: 50%; display: grid; place-items: center; flex: none; background: var(--accent-soft); color: var(--accent-deep); }
.ch-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 1rem; margin-bottom: 3rem; }
.ch-card { display: flex; flex-direction: column; gap: 0.5rem; padding: 1.2rem 1.3rem 0; text-decoration: none; color: inherit; overflow: hidden; transition: border-color 0.15s, transform 0.15s, box-shadow 0.15s; }
.ch-card:hover { border-color: var(--line-strong); transform: translateY(-2px); box-shadow: var(--shadow-md); }
.ch-card h2 { font-size: 1.2rem; margin: 0; }
.ch-top { display: flex; justify-content: space-between; align-items: center; }
.ch-n { font: 700 0.8rem/1 var(--font-mono); color: var(--faint); }
.ch-status { display: inline-flex; align-items: center; gap: 0.3rem; font-size: 0.8rem; font-weight: 600; color: var(--soft); }
.ch-status .icon { width: 16px; height: 16px; }
.ch-card.is-done .ch-status { color: var(--ok); }
.ch-card.is-ready .ch-status { color: var(--accent-deep); }
.ch-sum { margin: 0; color: var(--soft); font-size: 0.93rem; }
.ch-types { display: flex; flex-wrap: wrap; gap: 0.35rem; margin: 0.2rem 0 0; }
.ch-types span { font-size: 0.78rem; padding: 0.15rem 0.5rem; border-radius: 999px; background: var(--tint); color: var(--soft); }
.ch-foot { display: flex; justify-content: space-between; gap: 0.75rem; flex-wrap: wrap; margin-top: auto; padding: 0.6rem 0 0.9rem; color: var(--faint); font-size: 0.8rem; }
.ch-foot span { display: inline-flex; align-items: center; gap: 0.3rem; }
.ch-foot .icon { width: 15px; height: 15px; }
.ch-card .bar { margin: 0 -1.3rem; border-radius: 0; height: 4px; }
.ch-card.is-done .bar > span { background: var(--ok); }

/* Playground: Output, Review and Tests */
.ws-tabs { display: flex; gap: 2px; margin-left: 0.35rem; padding: 2px; border-radius: var(--radius-sm); background: rgba(0, 0, 0, 0.25); }
.ws-tabs button {
  display: inline-flex; align-items: center; gap: 0.35rem; border: 0; background: transparent; color: var(--ed-chrome-ink);
  font: 500 0.84rem var(--font-body); padding: 0.35rem 0.65rem; border-radius: 3px; cursor: pointer;
}
.ws-tabs button .icon { width: 15px; height: 15px; }
.ws-tabs button:hover { color: #fff; }
.ws-tabs button[aria-selected='true'] { background: #2a3238; color: #fff; }
.ws-tabs button:focus-visible { outline: 2px solid var(--ed-caret); outline-offset: 1px; }
.tab-badge { min-width: 1.4rem; padding: 0 0.35rem; border-radius: 999px; font: 700 0.7rem/1.35rem var(--font-mono); text-align: center; background: #3a444b; color: #fff; }
.tab-badge[data-grade='good'] { background: #1f7a4a; }
.tab-badge[data-grade='fair'] { background: #8a6a12; }
.tab-badge[data-grade='low'] { background: #8a3a2c; }
.tab-badge[data-stale='1'] { opacity: 0.55; }
.ws-panes { min-height: 0; display: grid; }
.ws-panes > * { min-height: 0; grid-area: 1 / 1; }
.ws-panes > [hidden] { display: none; }
.play-main .workspace.wide-pane { grid-template-rows: minmax(140px, 1fr) auto minmax(200px, 52%); }
.pane { overflow: auto; background: var(--con-bg); color: var(--con-ink); padding: 1rem 1.1rem 1.5rem; font-size: 0.92rem; }
.pane p { margin: 0 0 0.6rem; }
.pane-empty, .pane-wait { color: var(--con-faint); }
.pane .btn-ghost { --b-ink: var(--ed-chrome-ink); --b-line: var(--ed-chrome-line); }
.pane .btn-ghost:hover { --b-bg: rgba(255, 255, 255, 0.06); --b-ink: #fff; }
.rv-head { display: grid; grid-template-columns: auto minmax(0, 1fr) auto; gap: 1rem; align-items: center; padding-bottom: 0.9rem; border-bottom: 1px solid var(--ed-chrome-line); margin-bottom: 0.6rem; }
.rv-head strong { font-size: 1.05rem; }
.rv-head p { color: var(--con-faint); margin: 0.15rem 0 0; }
.rv-score { width: 4.4rem; height: 4.4rem; border-radius: 50%; display: grid; place-content: center; text-align: center; border: 3px solid #3a444b; }
.rv-score b { font: 700 1.5rem/1 var(--font-display); }
.rv-score small { font-size: 0.65rem; color: var(--con-faint); }
.rv-score.good { border-color: #4ad08a; }
.rv-score.good b { color: #7fe3ad; }
.rv-score.fair { border-color: #e6c27a; }
.rv-score.fair b { color: #f0d49a; }
.rv-score.low, .rv-score.bad { border-color: #f07160; }
.rv-score.low b, .rv-score.bad b { color: #ffb4a7; }
.rv-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.15rem; }
.rv-item { display: grid; grid-template-columns: 1.6rem minmax(0, 1fr); gap: 0.6rem; padding: 0.6rem 0.4rem; border-radius: var(--radius-sm); }
.rv-item:hover { background: rgba(255, 255, 255, 0.03); }
.rv-item p { margin: 0.15rem 0 0; color: #b9c0c5; line-height: 1.5; }
.rv-icon { padding-top: 0.1rem; }
.rv-problem .rv-icon { color: #f4a597; }
.rv-suggestion .rv-icon { color: #e6c27a; }
.rv-good .rv-icon { color: #7fe3ad; }
.rv-title { display: flex; gap: 0.6rem; align-items: center; flex-wrap: wrap; }
.rv-line { border: 1px solid var(--ed-chrome-line); background: transparent; color: var(--con-faint); border-radius: 3px; font: 600 0.72rem/1 var(--font-mono); padding: 0.25rem 0.4rem; cursor: pointer; }
.rv-line:hover { color: #fff; border-color: #46525a; }
.rv-sub { font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--con-faint); margin: 1rem 0 0.2rem; font-family: var(--font-body); }
.rv-note { color: var(--con-faint); font-size: 0.82rem; margin-top: 1.1rem !important; }
.tc-top { display: flex; gap: 1rem; justify-content: space-between; align-items: flex-start; flex-wrap: wrap; }
.tc-top p { color: var(--con-faint); max-width: 56ch; }
.tc-actions { display: flex; gap: 0.4rem; flex-wrap: wrap; }
.tc-summary-wrap { margin: 0.2rem 0 0.6rem; }
.tc-summary { font-weight: 600; margin: 0 !important; }
.tc-summary.good { color: #7fe3ad; }
.tc-summary.bad { color: #ffb4a7; }
.tc { border: 1px solid var(--ed-chrome-line); border-radius: var(--radius); margin-bottom: 0.7rem; background: rgba(255, 255, 255, 0.015); }
.tc.pass { border-color: rgba(74, 208, 138, 0.45); }
.tc.fail { border-color: rgba(240, 113, 96, 0.5); }
.tc-head { display: flex; align-items: center; gap: 0.6rem; padding: 0.45rem 0.6rem 0.45rem 0.85rem; border-bottom: 1px solid var(--ed-chrome-line); }
.tc-kind { font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.07em; color: var(--con-faint); }
.tc-n { font-weight: 600; margin-right: auto; }
.tc-remove { border: 0; background: transparent; color: var(--con-faint); cursor: pointer; padding: 0.25rem; border-radius: 3px; display: grid; }
.tc-remove:hover { color: #ffb4a7; background: rgba(240, 113, 96, 0.1); }
.tc-remove .icon { width: 16px; height: 16px; }
.tc-body { display: grid; grid-template-columns: 1fr 1fr; gap: 0.6rem 0.8rem; padding: 0.7rem 0.85rem; }
.tc-field label { display: block; font-size: 0.78rem; color: var(--con-faint); margin-bottom: 0.25rem; }
.tc-field input, .tc-field textarea {
  width: 100%; font: 0.88rem/1.45 var(--font-mono); color: var(--con-ink); background: #161a1d;
  border: 1px solid var(--ed-chrome-line); border-radius: var(--radius-sm); padding: 0.4rem 0.55rem; resize: vertical;
}
.tc-field input:focus, .tc-field textarea:focus { outline: none; border-color: var(--ed-caret); box-shadow: 0 0 0 3px rgba(91, 205, 191, 0.15); }
.tc-mode { grid-column: 1 / -1; font-size: 0.84rem; color: var(--con-faint); display: flex; align-items: center; gap: 0.4rem; }
.tc-result { display: grid; grid-template-columns: 1.4rem minmax(0, 1fr); gap: 0.5rem; padding: 0.6rem 0.85rem 0.75rem; border-top: 1px solid var(--ed-chrome-line); }
.tc.pass .tc-result { color: #7fe3ad; }
.tc.fail .tc-result { color: #ffb4a7; }
.tc-result p { color: #b9c0c5; margin: 0.15rem 0 0; }
.tc-diff { display: grid; grid-template-columns: 1fr 1fr; gap: 0.6rem; margin-top: 0.5rem; }
.tc-diff small { color: var(--con-faint); font-size: 0.75rem; }
.tc-diff pre { margin: 0.2rem 0 0; padding: 0.45rem 0.6rem; background: #161a1d; border-radius: var(--radius-sm); font: 0.84rem/1.45 var(--font-mono); color: var(--con-ink); white-space: pre-wrap; word-break: break-word; }

/* Dashboard: today, quests, badges */
.today-card .today-top { display: flex; gap: 1rem; align-items: center; margin-bottom: 0.9rem; }
.today-card .today-top p { margin: 0; }
.goal-ring { position: relative; width: 64px; height: 64px; flex: none; }
.goal-ring svg circle:last-child { transition: stroke-dashoffset 0.8s var(--ease); }
.goal-ring > span { position: absolute; inset: 0; display: grid; place-items: center; font: 700 0.85rem var(--font-display); color: var(--ink); }
.goal-ring > span .icon { color: var(--ok); }
.quests-head { display: flex; justify-content: space-between; font-size: 0.85rem; margin-bottom: 0.35rem; }
.quests-head span { color: var(--faint); }
.quests { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.35rem; }
.quests li { display: grid; grid-template-columns: 1.3rem minmax(0, 1fr) auto; gap: 0.55rem; align-items: center; font-size: 0.9rem; padding: 0.4rem 0.55rem; border-radius: var(--radius-sm); background: var(--bg-raised); border: 1px solid var(--line); }
.q-check { width: 1.3rem; height: 1.3rem; border-radius: 50%; border: 1.5px solid var(--line-strong); display: grid; place-items: center; }
.q-check .icon { width: 13px; height: 13px; }
.quests li.done .q-check { background: var(--ok); border-color: var(--ok); color: #fff; }
.quests li.done .q-text { color: var(--faint); text-decoration: line-through; }
.q-prog { font: 600 0.78rem var(--font-mono); color: var(--faint); }
.quests li.done .q-prog { color: var(--ok); }
.quests-note { font-size: 0.82rem !important; margin: 0.6rem 0 0 !important; color: var(--faint) !important; }
.stat-link { text-decoration: none; color: inherit; transition: border-color 0.15s; }
.stat-link:hover { border-color: var(--line-strong); }
.stat .bar { margin: 0.35rem 0 0.3rem; height: 5px; }
.main-stack { display: grid; gap: 1rem; align-content: start; min-width: 0; }
.main-stack .badge-strip { margin-top: 0; }
.badge-strip { margin-top: 1rem; }
.bs-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 0.6rem; }
.bs-head h3 { margin: 0; }
.bs-head a { font-size: 0.88rem; }
.bs-row { display: flex; gap: 0.5rem; flex-wrap: wrap; }
.badge-chip { display: inline-flex; align-items: center; gap: 0.4rem; padding: 0.35rem 0.7rem 0.35rem 0.45rem; border-radius: 999px; background: var(--accent-soft); color: var(--accent-deep); font-size: 0.85rem; font-weight: 600; }
.badge-chip .icon { width: 16px; height: 16px; }
.bs-next { display: grid; grid-template-columns: minmax(0, 1fr) 120px auto; gap: 0.75rem; align-items: center; margin-top: 0.9rem; padding-top: 0.8rem; border-top: 1px solid var(--line); font-size: 0.88rem; color: var(--soft); }
.bs-count { font: 600 0.8rem var(--font-mono); color: var(--faint); }

/* Profile */
.profile { padding: 2.5rem 0 3rem; }
.pf-head { display: flex; gap: 1.2rem; align-items: center; flex-wrap: wrap; margin-bottom: 1.5rem; }
.avatar-lg { width: 72px; height: 72px; font-size: 1.8rem; }
.avatar-lg:empty::before { content: '?'; }
.pf-who { flex: 1; min-width: 220px; }
.pf-who h1 { font-size: clamp(1.7rem, 3.5vw, 2.3rem); margin: 0; }
.pf-who .muted { margin: 0.25rem 0 0; }
.pf-actions { display: flex; gap: 0.5rem; }
.pf-level { display: flex; gap: 1.3rem; align-items: center; padding: 1.3rem 1.5rem; margin-bottom: 1rem; }
.pfl-badge { width: 84px; height: 84px; border-radius: 50%; flex: none; display: grid; place-content: center; text-align: center; background: var(--accent); color: var(--accent-ink); box-shadow: 0 0 0 6px var(--accent-soft); }
.pfl-badge small { font-size: 0.7rem; letter-spacing: 0.08em; text-transform: uppercase; opacity: 0.85; }
.pfl-badge b { font: 800 2rem/1 var(--font-display); }
.pfl-main { flex: 1; min-width: 0; }
.pfl-row { display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; margin-bottom: 0.5rem; }
.bar-lg { height: 10px; border-radius: 5px; }
.bar-lg > span { border-radius: 5px; }
.pfl-today { margin: 0.7rem 0 0; font-size: 0.9rem; }
.pf-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; margin-bottom: 1rem; }
.pf-section { margin-bottom: 1rem; }
.card.pf-section { padding: 1.3rem 1.5rem; }
.pf-section-head { display: flex; justify-content: space-between; align-items: baseline; gap: 1rem; flex-wrap: wrap; margin-bottom: 1rem; }
.pf-section-head h2 { font-size: 1.15rem; margin: 0; display: inline-flex; align-items: center; gap: 0.5rem; }
.pf-section-head .muted { font-size: 0.88rem; }
#badges { margin-top: 2rem; }
.heat-wrap { overflow-x: auto; padding-bottom: 0.3rem; }
.heat { display: grid; grid-template-rows: repeat(7, auto); grid-auto-flow: column; grid-auto-columns: minmax(11px, 1fr); gap: 3px; width: 100%; }
.heat i { aspect-ratio: 1; border-radius: 2px; background: var(--tint); display: block; }
.heat-key i { width: 12px; height: 12px; border-radius: 2px; background: var(--tint); display: block; }
.heat i[data-l='1'], .heat-key i[data-l='1'] { background: color-mix(in srgb, var(--accent) 30%, var(--tint)); }
.heat i[data-l='2'], .heat-key i[data-l='2'] { background: color-mix(in srgb, var(--accent) 55%, var(--tint)); }
.heat i[data-l='3'], .heat-key i[data-l='3'] { background: color-mix(in srgb, var(--accent) 80%, var(--tint)); }
.heat i[data-l='4'], .heat-key i[data-l='4'] { background: var(--accent); }
.heat-key { display: flex; gap: 3px; align-items: center; justify-content: flex-end; font-size: 0.75rem; color: var(--faint); margin-top: 0.5rem; }
.heat-key span { margin: 0 0.3rem; }
.badge-group { margin-bottom: 1.4rem; }
.badge-group h3 { font: 600 0.78rem var(--font-body); text-transform: uppercase; letter-spacing: 0.08em; color: var(--faint); margin: 0 0 0.6rem; }
.badge-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 0.75rem; }
.badge-card { display: flex; gap: 0.8rem; padding: 0.9rem 1rem; align-items: flex-start; }
.bc-icon { width: 42px; height: 42px; border-radius: 50%; flex: none; display: grid; place-items: center; background: var(--tint); color: var(--faint); }
.badge-card.earned .bc-icon { background: var(--accent); color: var(--accent-ink); box-shadow: 0 0 0 4px var(--accent-soft); }
.badge-card:not(.earned) strong { color: var(--soft); }
.bc-text { min-width: 0; flex: 1; }
.bc-text strong { font-size: 0.95rem; }
.bc-text p { margin: 0.15rem 0 0; color: var(--faint); font-size: 0.83rem; line-height: 1.4; }
.bc-prog { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 0.5rem; align-items: center; margin-top: 0.5rem; }
.bc-prog small { font: 600 0.75rem var(--font-mono); color: var(--faint); }
.bc-done { display: inline-flex; gap: 0.25rem; align-items: center; color: var(--ok); margin-top: 0.4rem; font: 600 0.75rem var(--font-body); }
.bc-done .icon { width: 14px; height: 14px; }
.settings-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem 2rem; }
.settings-grid h3 { font-size: 0.95rem; margin: 0 0 0.3rem; }
.settings-grid select.input { width: auto; min-width: 9rem; }
.pref-stack { flex-direction: column; align-items: flex-start; }
.pref-label { font-weight: 500; }
.swatches { display: flex; gap: 0.45rem; flex-wrap: wrap; }
.swatch { width: 30px; height: 30px; border-radius: 50%; border: 2px solid transparent; cursor: pointer; padding: 0; background: #e0efec; box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.08); }
.swatch[data-avatar='1'] { background: #e3ecfb; }
.swatch[data-avatar='2'] { background: #f6e6f1; }
.swatch[data-avatar='3'] { background: #fbeedd; }
.swatch[data-avatar='4'] { background: #e6f4e2; }
.swatch[data-avatar='5'] { background: #efe8fb; }
.swatch[data-avatar='6'] { background: #fde8e4; }
.swatch[data-avatar='7'] { background: #2a3136; }
.swatch[aria-checked='true'] { border-color: var(--accent); box-shadow: 0 0 0 2px var(--bg), 0 0 0 4px var(--accent); }

@media (max-width: 1000px) {
  .pf-stats { grid-template-columns: repeat(2, 1fr); }
  .settings-grid { grid-template-columns: 1fr 1fr; }
  .trace-grid { grid-template-columns: 1fr; }
  .trace-grid .numbered-code { position: static; }
  .ch-kinds { grid-template-columns: 1fr; }
}
@media (max-width: 900px) {
  .play-main .ws-panes { height: 320px; }
  .play-main .workspace.wide-pane { grid-template-rows: auto auto auto; }
  .play-main .ws-panes .console { height: 100%; }
  .ws-bar { flex-wrap: wrap; }
}
@media (max-width: 700px) {
  .settings-grid { grid-template-columns: 1fr; }
  .pf-stats { grid-template-columns: 1fr 1fr; gap: 0.6rem; }
  .pf-level { flex-direction: column; align-items: stretch; }
  .pfl-badge { width: 64px; height: 64px; }
  .bh-compare, .tc-body, .tc-diff { grid-template-columns: 1fr; }
  .bs-next { grid-template-columns: 1fr auto; }
  .bs-next-label { grid-column: 1 / -1; }
  .rv-head { grid-template-columns: auto minmax(0, 1fr); }
  .rv-head > .btn { grid-column: 1 / -1; justify-self: start; }
  .ws-tabs button span:not(.tab-badge) { display: none; }
  .ws-tabs button[aria-selected='true'] span:not(.tab-badge) { display: inline; }
  .cn-level span { display: none; }
}

/* "I'm not a robot" box on sign-up and password reset (logic in /assets/js/captcha.js) */
.captcha { display: flex; flex-wrap: wrap; align-items: center; gap: 0.4rem 0.9rem; }
.captcha-box {
  display: inline-flex; align-items: center; gap: 0.7rem; min-height: 48px; min-width: 210px;
  padding: 0.55rem 0.9rem 0.55rem 0.7rem; border: 1.5px solid var(--line-strong); border-radius: var(--radius);
  background: var(--card); color: var(--ink); font: inherit; font-weight: 600; cursor: pointer; text-align: left;
}
.captcha-box:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }
.captcha-tick { width: 24px; height: 24px; flex: none; border: 2px solid var(--line-strong); border-radius: var(--radius-sm); display: grid; place-items: center; }
.captcha.is-working .captcha-tick { border-color: var(--accent-soft); border-top-color: var(--accent); border-radius: 50%; animation: captcha-spin 0.8s linear infinite; }
.captcha.is-done .captcha-tick { background: var(--ok); border-color: var(--ok); }
.captcha.is-done .captcha-tick::after { content: ''; width: 6px; height: 12px; border: solid #fff; border-width: 0 2.5px 2.5px 0; transform: translateY(-1px) rotate(45deg); }
.captcha.is-broken .captcha-label { font-weight: 400; color: var(--bad); }
.captcha-note { color: var(--faint); font-size: 0.85rem; }
.captcha-noscript { flex-basis: 100%; margin: 0; color: var(--bad); font-size: 0.9rem; }
@keyframes captcha-spin { to { transform: rotate(360deg); } }

/* ---------------------------------------------------------------- classes */
.page-pad { padding: 2.5rem 0 3rem; }
.page-h1 { font-size: clamp(1.7rem, 3.5vw, 2.3rem); margin: 0 0 0.4rem; }
.lede-text { font-size: 1.08rem; color: var(--soft); max-width: 62ch; margin: 0 0 1.5rem; }
.card.pad { padding: 1.3rem 1.5rem; }
.small { font-size: 0.88rem; }
.small-h { font-size: 0.98rem; margin: 1rem 0 0.4rem; }
.section-h { font-size: 1.2rem; margin: 2rem 0 0.8rem; }
.stack { display: grid; gap: 0.9rem; justify-items: start; }
.stack > .field, .stack > .btn-block { justify-self: stretch; }
.btn-row { display: flex; gap: 0.6rem; flex-wrap: wrap; }
.crumb { margin: 0 0 1rem; }
.crumb a { display: inline-flex; align-items: center; gap: 0.35rem; }
.crumb .icon { width: 16px; height: 16px; }
.teach-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; margin-top: 1rem; }
.tick-list { margin: 0.4rem 0 1rem; padding: 0; list-style: none; display: grid; gap: 0.45rem; }
.tick-list li { padding-left: 1.6rem; position: relative; }
.tick-list li::before { content: ''; position: absolute; left: 0.3rem; top: 0.35em; width: 0.45rem; height: 0.8rem; border: solid var(--ok); border-width: 0 2.5px 2.5px 0; transform: rotate(45deg); }
.class-list { list-style: none; margin: 0 0 1rem; padding: 0; display: grid; gap: 0.6rem; }
.class-list li { display: flex; flex-wrap: wrap; gap: 0.4rem 1.2rem; align-items: center; padding: 0.9rem 1.2rem; }
.class-list li > a { margin-right: auto; }
.code-chip { font: 600 0.9em var(--font-mono); background: var(--tint); border: 1px solid var(--line); padding: 0.05em 0.45em; border-radius: var(--radius-sm); letter-spacing: 0.05em; color: var(--ink); }
.class-head { display: flex; justify-content: space-between; align-items: flex-end; gap: 1rem; flex-wrap: wrap; margin-bottom: 1rem; }
.join-box { display: grid; gap: 0.15rem; padding: 0.9rem 1.2rem; min-width: 240px; }
.join-code { font: 700 1.7rem var(--font-mono); letter-spacing: 0.12em; color: var(--accent-deep); }
.verified-note { display: flex; gap: 0.6rem; align-items: flex-start; background: var(--ok-soft); border: 1px solid var(--ok-line); border-radius: var(--radius); padding: 0.8rem 1rem; margin: 1rem 0; font-size: 0.93rem; }
.verified-note .icon { color: var(--ok); flex: none; margin-top: 0.1rem; }
.empty-class h2 { font-size: 1.15rem; margin: 0 0 0.4rem; }
.table-scroll { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); background: var(--card); }
.table-scroll:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }
.data-table { border-collapse: collapse; width: 100%; font-size: 0.93rem; }
.data-table th, .data-table td { text-align: left; padding: 0.6rem 0.8rem; border-bottom: 1px solid var(--line); vertical-align: top; }
.data-table thead th { font-size: 0.82rem; color: var(--soft); font-weight: 600; background: var(--bg-raised); white-space: nowrap; }
.data-table tbody th { font-weight: 600; }
.data-table tbody tr:last-child th, .data-table tbody tr:last-child td { border-bottom: 0; }
.cp-grid th, .cp-grid td { padding: 0.45rem 0.5rem; text-align: center; white-space: nowrap; }
.cp-grid tbody th { text-align: left; }
.cp-grid td.cp-pass { background: var(--ok-soft); color: var(--ok); font-weight: 600; }
.cp-grid td.cp-fail { background: var(--hint-soft); color: var(--hint); }
.check-row { display: flex; align-items: center; gap: 0.55rem; font-weight: 500; }
.check-row input { width: 18px; height: 18px; accent-color: var(--accent); }
.danger-row { display: grid; gap: 0.4rem; border-top: 1px solid var(--line); padding-top: 0.9rem; margin-top: 0.3rem; width: 100%; }
.danger-row .input { max-width: 220px; }
.danger-row .btn { justify-self: start; }
.stat-row { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 1rem; margin: 1.2rem 0; }
.code-evidence { margin: 1rem 0 1.5rem; }
.code-evidence h2 { font-size: 1.1rem; margin: 0 0 0.3rem; }
.code-evidence .code-block { white-space: pre-wrap; }
.unit-detail { margin-bottom: 0.6rem; padding: 0.2rem 1.2rem 0.8rem; }
.unit-detail summary { display: flex; flex-wrap: wrap; align-items: center; gap: 0.4rem 1rem; cursor: pointer; padding: 0.7rem 0 0.2rem; }
.unit-detail summary > span:first-child { margin-right: auto; }
.step-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.25rem; }
.step-list li { display: grid; grid-template-columns: 1.4rem minmax(0, 1fr) auto; gap: 0.5rem; align-items: baseline; font-size: 0.93rem; padding: 0.2rem 0; }
.step-mark { width: 1.2rem; height: 1.2rem; border-radius: 50%; border: 1.5px solid var(--line-strong); display: grid; place-items: center; align-self: center; }
.step-mark .icon { width: 12px; height: 12px; }
.step-list li.is-verified .step-mark { background: var(--ok); border-color: var(--ok); color: #fff; }
.join-confirm h2 { font-size: 1.3rem; margin: 0; }
.join-input { font: 600 1.3rem var(--font-mono); letter-spacing: 0.15em; text-transform: uppercase; max-width: 16ch; }
.board-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; margin-top: 1rem; }
.board-grid h2 { font-size: 1.1rem; margin: 0 0 0.6rem; }
.board tr.is-me th, .board tr.is-me td { background: var(--accent-soft); }
@media (max-width: 800px) {
  .teach-grid, .board-grid { grid-template-columns: 1fr; }
  .stat-row { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

/* Privacy, accessibility and institution pages */
.doc h2 { font-size: 1.25rem; margin: 2rem 0 0.6rem; scroll-margin-top: 1rem; }
.doc p, .doc li, .doc dd { line-height: 1.65; }
.doc ul { padding-left: 1.2rem; }
.doc li { margin-bottom: 0.35rem; }
.doc .table-scroll { margin: 0.8rem 0 1rem; }
.doc-toc { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 0.8rem 1.2rem; margin: 0 0 1.5rem; }
.doc-toc ol { margin: 0; padding-left: 1.2rem; columns: 2; }
.doc-dl dt { font-weight: 700; margin-top: 0.9rem; }
.doc-dl dd { margin: 0.2rem 0 0; color: var(--soft); }
@media (max-width: 600px) { .doc-toc ol { columns: 1; } }