/* Brainlag Code: dark-first dev aesthetic. Tokens first. */
:root {
  --bg: #0a0c10;
  --bg2: #0d1016;
  --surface: #12161e;
  --surface2: #181d27;
  --code-bg: #0e1218;
  --border: #232a36;
  --border2: #2e3644;
  --text: #e8ebf1;
  --text2: #c3c9d4;
  --muted: #8b95a7;
  --teal: #1fb8c4;
  --teal-strong: #0d9aa7;
  --teal-soft: rgba(31, 184, 196, .14);
  --purple: #9b84ea;
  --purple-strong: #5b3fa8;
  --purple-soft: rgba(138, 111, 224, .16);
  --ok: #3ccf8a;
  --ok-soft: rgba(60, 207, 138, .12);
  --bad: #ff6b6b;
  --bad-soft: rgba(255, 107, 107, .1);
  --warn: #f2b84b;
  --on-accent: #041214;
  --shadow: 0 10px 30px rgba(0, 0, 0, .35);
  --syn-kw: #c792ea;
  --syn-str: #a8dc7f;
  --syn-num: #f7a76c;
  --syn-com: #7f8a9e;
  --btn-teal: #0b7f8a;
  --syn-fn: #6cc8f0;
  --syn-type: #ffcb6b;
  --syn-prop: #7fdbca;
  --syn-punc: #9aa5b8;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", "Cascadia Code", "JetBrains Mono", Menlo, Consolas, monospace;
  --radius: 12px;
  --gutter: 16px;
  color-scheme: dark;
}
:root[data-theme="light"] {
  --bg: #f6f7fb;
  --bg2: #eef0f6;
  --surface: #ffffff;
  --surface2: #f3f5f9;
  --code-bg: #fbfcfe;
  --border: #dfe3eb;
  --border2: #cfd5df;
  --text: #131720;
  --text2: #2c3340;
  --muted: #5a6475;
  --teal: #08737c;
  --teal-strong: #0b7f8a;
  --teal-soft: rgba(13, 154, 167, .1);
  --purple: #5b3fa8;
  --purple-strong: #5b3fa8;
  --purple-soft: rgba(91, 63, 168, .09);
  --ok: #117a47;
  --ok-soft: rgba(19, 138, 80, .09);
  --bad: #c62828;
  --bad-soft: rgba(198, 40, 40, .07);
  --warn: #9a6200;
  --on-accent: #ffffff;
  --shadow: 0 10px 30px rgba(20, 30, 50, .08);
  --syn-kw: #7c3aed;
  --syn-str: #2e7d32;
  --syn-num: #c2410c;
  --syn-com: #687284;
  --syn-fn: #0b6fb8;
  --syn-type: #a15c00;
  --syn-prop: #0f766e;
  --syn-punc: #4b5563;
  color-scheme: light;
}

*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: 72px; }
body {
  margin: 0; background: var(--bg); color: var(--text); font: 16px/1.6 var(--sans);
  -webkit-font-smoothing: antialiased; overflow-x: hidden;
  min-height: 100vh; min-height: 100dvh; display: flex; flex-direction: column;
}
body > main { flex: 1 0 auto; }
a { color: var(--teal); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
img, svg { display: inline-block; vertical-align: middle; }
h1, h2, h3 { line-height: 1.15; letter-spacing: -.02em; margin: 0 0 .5em; }
h1 { font-size: clamp(2rem, 5vw, 3rem); font-weight: 800; }
h2 { font-size: clamp(1.4rem, 3vw, 1.9rem); font-weight: 750; }
h3 { font-size: 1.15rem; font-weight: 700; }
p { margin: 0 0 1em; }
code, pre, kbd { font-family: var(--mono); }
.muted { color: var(--muted); }
.small { font-size: .875rem; }
.center { text-align: center; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--teal); color: var(--on-accent); padding: 8px 12px; border-radius: 8px; z-index: 100; }
.skip:focus { left: 8px; }
:focus-visible { outline: 2px solid var(--teal); outline-offset: 2px; }
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 var(--gutter); }
.eyebrow { font: 600 .8rem/1.2 var(--mono); color: var(--teal); text-transform: uppercase; letter-spacing: .08em; margin-bottom: .9em; }
.lede { font-size: 1.15rem; color: var(--text2); max-width: 46rem; }

/* ---------- top bar ---------- */
.topbar { position: sticky; top: 0; z-index: 50; background: color-mix(in srgb, var(--bg) 86%, transparent); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); border-bottom: 1px solid var(--border); }
.topbar-in { max-width: 1320px; margin: 0 auto; padding: 0 var(--gutter); height: 58px; display: flex; align-items: center; gap: 20px; }
.logo { display: inline-flex; align-items: center; gap: 9px; color: var(--text); font: 700 1.02rem/1 var(--mono); white-space: nowrap; }
.logo:hover { text-decoration: none; }
.logo-mark { display: inline-grid; place-items: center; width: 30px; height: 30px; border-radius: 8px; background: linear-gradient(135deg, var(--teal-strong), var(--purple-strong)); color: #fff; font-size: .85rem; letter-spacing: -.05em; }
.logo-word b { color: var(--teal); font-weight: 700; }
.logo.small { font-size: .95rem; }
.nav { display: flex; gap: 4px; margin-left: 8px; }
.nav a { color: var(--text2); padding: 7px 11px; border-radius: 8px; font-size: .95rem; font-weight: 550; }
.nav a:hover { background: var(--surface2); text-decoration: none; color: var(--text); }
.nav a[aria-current="page"] { color: var(--text); background: var(--surface2); }
.nav .nav-ext { color: var(--muted); }
.top-actions { margin-left: auto; display: flex; align-items: center; gap: 8px; }
.streak { display: inline-flex; align-items: center; gap: 4px; padding: 4px 10px; border-radius: 99px; background: rgba(242, 140, 40, .14); color: #f59e3b; font: 700 .85rem/1.4 var(--mono); }
.icon-btn { display: inline-grid; place-items: center; width: 36px; height: 36px; border-radius: 9px; border: 1px solid var(--border); background: var(--surface); color: var(--text2); cursor: pointer; }
.icon-btn:hover { color: var(--text); border-color: var(--border2); }
.i-sun { display: none; }
:root[data-theme="light"] .i-sun { display: inline; }
:root[data-theme="light"] .i-moon { display: none; }

/* ---------- buttons ---------- */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 7px; min-height: 38px; padding: 8px 15px; border-radius: 9px; border: 1px solid transparent; font: 650 .92rem/1 var(--sans); cursor: pointer; text-decoration: none; white-space: nowrap; transition: transform .08s ease, background .15s ease, border-color .15s ease; }
.btn:hover { text-decoration: none; }
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: .5; cursor: default; }
.btn-lg { min-height: 48px; padding: 12px 22px; font-size: 1rem; border-radius: 11px; }
.btn-sm { min-height: 30px; padding: 5px 10px; font-size: .82rem; }
.btn-primary { background: var(--btn-teal); color: #fff; }
.btn-primary:hover { background: color-mix(in srgb, var(--btn-teal) 88%, #fff); }
.btn-run { background: var(--ok); color: #04150c; }
:root[data-theme="light"] .btn-run { color: #fff; }
.btn-run:hover { filter: brightness(1.08); }
.btn-check { background: var(--purple-strong); color: #fff; }
.btn-check:hover { background: color-mix(in srgb, var(--purple-strong) 82%, #fff); }
.btn-ghost { background: transparent; border-color: var(--border2); color: var(--text2); }
.btn-ghost:hover { background: var(--surface2); color: var(--text); }

/* ---------- hero ---------- */
.hero { position: relative; overflow: hidden; border-bottom: 1px solid var(--border); background:
  radial-gradient(900px 420px at 85% -10%, var(--purple-soft), transparent 70%),
  radial-gradient(700px 380px at 5% 0%, var(--teal-soft), transparent 70%), var(--bg); }
.hero::before { content: ""; position: absolute; inset: 0; background-image: linear-gradient(var(--border) 1px, transparent 1px), linear-gradient(90deg, var(--border) 1px, transparent 1px); background-size: 44px 44px; opacity: .25; mask-image: linear-gradient(to bottom, #000, transparent 85%); -webkit-mask-image: linear-gradient(to bottom, #000, transparent 85%); pointer-events: none; }
.hero-in { position: relative; max-width: 1180px; margin: 0 auto; padding: 72px var(--gutter) 64px; display: grid; grid-template-columns: 1.05fr 1fr; gap: 48px; align-items: center; }
.hero h1 { font-size: clamp(2.6rem, 7vw, 4.6rem); line-height: 1; letter-spacing: -.04em; margin-bottom: .35em; }
.hero h1 { background: linear-gradient(100deg, var(--text) 40%, var(--teal) 75%, var(--purple)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 12px; margin: 26px 0 18px; }
.hero-demo { background: var(--surface); border: 1px solid var(--border); border-radius: 16px; box-shadow: var(--shadow); overflow: hidden; min-width: 0; }
.demo-chrome { display: flex; align-items: center; gap: 12px; padding: 10px 14px; border-bottom: 1px solid var(--border); background: var(--surface2); font: .8rem var(--mono); color: var(--muted); }
.dots { display: inline-flex; gap: 6px; }
.dots i { width: 10px; height: 10px; border-radius: 50%; background: var(--border2); }
.dots i:first-child { background: #ff5f57; } .dots i:nth-child(2) { background: #febc2e; } .dots i:nth-child(3) { background: #28c840; }
.demo-tip { margin-left: auto; color: var(--teal); }
.runbox.demo { border: 0; border-radius: 0; margin: 0; }
.runbox.demo .output { min-height: 108px; }

/* ---------- sections ---------- */
section { scroll-margin-top: 70px; }
.sec-head-lg { margin: 72px 0 26px; max-width: 46rem; }
.sec-head-lg p { margin: 0; }
.sec-title { margin-top: 48px; }
.page-head { padding-top: 56px; padding-bottom: 8px; }
.track-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 16px; }
.track-card { position: relative; display: flex; flex-direction: column; gap: 8px; padding: 22px; background: var(--surface); border: 1px solid var(--border); border-radius: 14px; color: var(--text); transition: border-color .15s, transform .15s; overflow: hidden; }
.track-card:hover { text-decoration: none; border-color: var(--teal); transform: translateY(-2px); }
.tc-tag { font: 600 .75rem/1.2 var(--mono); color: var(--teal); text-transform: uppercase; letter-spacing: .06em; margin-top: 6px; }
.tc-name { font-size: 1.3rem; font-weight: 750; letter-spacing: -.01em; }
.tc-blurb { color: var(--text2); font-size: .95rem; flex: 1; }
.tc-meta { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 2px 12px; font: .8rem var(--mono); color: var(--muted); }
.bar { display: block; height: 5px; border-radius: 99px; background: var(--surface2); overflow: hidden; }
.bar > span { display: block; height: 100%; width: 0; background: linear-gradient(90deg, var(--teal-strong), var(--purple)); border-radius: 99px; transition: width .4s ease; }
.glyph { display: inline-grid; place-items: center; width: 44px; height: 44px; border-radius: 11px; font: 800 .9rem/1 var(--mono); color: #fff; letter-spacing: -.03em; flex: none; }
.glyph.big { width: 64px; height: 64px; font-size: 1.25rem; border-radius: 16px; margin-bottom: 18px; }
.g-python { background: linear-gradient(135deg, #3572a5, #f2c94c); }
.g-web { background: linear-gradient(135deg, #e44d26, #f7df1e); color: #1a1a1a; }
.g-sql { background: linear-gradient(135deg, #0d9aa7, #2563eb); }
.g-c { background: linear-gradient(135deg, #5b3fa8, #1e1b4b); }

.why { margin-top: 72px; padding: 8px 0 72px; background: var(--bg2); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.why-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; }
.why-card { padding: 22px; border-radius: 14px; background: var(--surface); border: 1px solid var(--border); }
.why-card h3 { color: var(--text); }
.why-card p { color: var(--text2); margin: 0; font-size: .97rem; }
.how-steps { list-style: none; padding: 0; margin: 0 0 20px; display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; }
.how-steps li { padding: 22px; border: 1px dashed var(--border2); border-radius: 14px; }
.how-steps .n { display: inline-grid; place-items: center; width: 32px; height: 32px; border-radius: 50%; background: var(--teal-soft); color: var(--teal); font: 800 .95rem var(--mono); margin-bottom: 12px; }
.how-steps p { color: var(--text2); margin: 0; }
.faq { max-width: 760px; margin-top: 72px; margin-bottom: 72px; }
.faq details { border-bottom: 1px solid var(--border); padding: 14px 0; }
.faq summary { cursor: pointer; font-weight: 650; font-size: 1.05rem; }
.faq details p { color: var(--text2); margin: 10px 0 0; }

/* ---------- projects ---------- */
.project-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 16px; margin-bottom: 20px; }
.project-card { display: flex; flex-direction: column; padding: 22px; background: var(--surface); border: 1px solid var(--border); border-radius: 14px; }
.project-card h3 { margin-top: 12px; }
.project-card p { color: var(--text2); font-size: .95rem; }
.project-card .btn { margin-top: auto; align-self: flex-start; }
.project-card.pro { background: linear-gradient(160deg, var(--purple-soft), transparent 60%), var(--surface); }
.pc-top { display: flex; justify-content: space-between; align-items: center; gap: 8px; flex-wrap: wrap; }
.pill { display: inline-flex; align-items: center; gap: 5px; padding: 3px 9px; border-radius: 99px; font: 700 .72rem/1.4 var(--mono); text-transform: uppercase; letter-spacing: .05em; }
.pill-free { background: var(--ok-soft); color: var(--ok); }
.pill-pro { background: var(--purple-soft); color: var(--purple); }
.steps { padding-left: 1.2em; color: var(--text2); font-size: .92rem; margin: 0 0 18px; }
.steps li { margin-bottom: 4px; }
.waitlist { margin: 48px 0 80px; padding: 28px; border-radius: 16px; border: 1px solid var(--border); background: linear-gradient(120deg, var(--teal-soft), var(--purple-soft)); display: grid; grid-template-columns: 1fr 1fr; gap: 24px; align-items: center; }
.waitlist h2 { margin-bottom: .3em; }
.waitlist-form { display: flex; flex-wrap: wrap; gap: 10px; }
.waitlist-form input { flex: 1 1 200px; min-height: 46px; padding: 0 14px; border-radius: 10px; border: 1px solid var(--border2); background: var(--surface); color: var(--text); font-size: 16px; }
.wl-msg { flex-basis: 100%; margin: 0; color: var(--text2); }

/* ---------- track page ---------- */
.track-hero { padding: 56px 0 40px; border-bottom: 1px solid var(--border); background: radial-gradient(700px 300px at 10% 0%, var(--teal-soft), transparent 70%); margin-bottom: 32px; }
.track-actions { display: flex; flex-wrap: wrap; gap: 12px; margin: 24px 0; }
.track-progress { display: flex; align-items: center; gap: 12px; max-width: 420px; }
.track-progress .bar { flex: 1; }
.track-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.track-list a { display: grid; grid-template-columns: 26px 34px 1fr auto; gap: 12px; align-items: center; padding: 16px 18px; background: var(--surface); border: 1px solid var(--border); border-radius: 12px; color: var(--text); }
.track-list a:hover { border-color: var(--teal); text-decoration: none; }
.tl-main { display: flex; flex-direction: column; min-width: 0; }
.tl-title { font-weight: 680; }
.tl-desc { color: var(--muted); font-size: .9rem; }
.n { font: 700 .85rem var(--mono); color: var(--muted); }
.tick { display: inline-grid; place-items: center; width: 22px; height: 22px; border-radius: 50%; border: 2px solid var(--border2); color: transparent; flex: none; }
.done .tick { background: var(--ok); border-color: var(--ok); color: #04150c; }

/* ---------- lesson ---------- */
.lesson-layout { max-width: 1320px; margin: 0 auto; padding: 0 var(--gutter); display: grid; grid-template-columns: 270px minmax(0, 1fr); gap: 40px; }
.sidebar { position: sticky; top: 58px; align-self: start; max-height: calc(100vh - 58px); overflow-y: auto; padding: 28px 0 40px; }
.side-track { display: flex; align-items: center; gap: 10px; font-weight: 750; color: var(--text); margin-bottom: 12px; }
.side-track .glyph { width: 32px; height: 32px; font-size: .72rem; border-radius: 8px; }
.side-progress { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; }
.side-progress .bar { flex: 1; }
.side-list summary { cursor: pointer; font: 600 .78rem var(--mono); text-transform: uppercase; letter-spacing: .07em; color: var(--muted); padding: 6px 0; }
.side-list ol { list-style: none; margin: 4px 0 0; padding: 0; }
.side-list a { display: flex; align-items: center; gap: 9px; padding: 7px 10px; border-radius: 8px; color: var(--text2); font-size: .92rem; line-height: 1.3; }
.side-list a:hover { background: var(--surface2); text-decoration: none; }
.side-list a[aria-current="page"] { background: var(--teal-soft); color: var(--text); font-weight: 650; }
.side-list .tick { width: 18px; height: 18px; border-width: 1.5px; }
.side-list .tick svg { width: 11px; height: 11px; }
.side-list .n { width: 18px; font-size: .75rem; }
.lesson { min-width: 0; max-width: 820px; padding: 32px 0 80px; }
.crumbs { display: flex; gap: 10px; align-items: center; font: .82rem var(--mono); color: var(--muted); margin-bottom: 14px; }
.crumbs a { color: var(--teal); }
.crumbs span::before { content: "/"; margin-right: 10px; color: var(--border2); }
.prose { font-size: 1.04rem; color: var(--text2); }
.prose p, .prose li { max-width: 70ch; }
.prose strong { color: var(--text); }
.prose h2, .prose h3, .prose h4 { color: var(--text); margin-top: 1.4em; }
.prose h2 { font-size: 1.3rem; }
.prose code { font-size: .88em; background: var(--surface2); border: 1px solid var(--border); padding: .08em .38em; border-radius: 6px; color: var(--text); }
.prose ul, .prose ol { padding-left: 1.3em; }
.prose li { margin-bottom: .3em; }
.note { margin: 1.2em 0; padding: 12px 16px; border-left: 3px solid var(--purple); background: var(--purple-soft); border-radius: 0 10px 10px 0; color: var(--text2); }
pre.code-static { margin: 1em 0; padding: 14px 16px; background: var(--code-bg); border: 1px solid var(--border); border-radius: 10px; overflow-x: auto; font-size: .9rem; line-height: 1.55; color: var(--text); white-space: pre; }
.editor pre.code-static { margin: 0; border: 0; border-radius: 0; min-height: 100px; }
.sec-head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin: 42px 0 14px; padding-top: 22px; border-top: 1px solid var(--border); }
.sec-head h2 { margin: 0; font-size: 1.4rem; }
.exercise { margin: 0 0 32px; }
.exercise h3 { display: flex; align-items: center; gap: 10px; font-size: 1.15rem; }
.ex-num { display: inline-grid; place-items: center; width: 28px; height: 28px; border-radius: 8px; background: var(--purple-soft); color: var(--purple); font: 800 .85rem var(--mono); flex: none; }
.ex-status { margin-left: auto; font: 700 .75rem var(--mono); text-transform: uppercase; letter-spacing: .06em; color: var(--ok); }
.exercise.solved .ex-num { background: var(--ok-soft); color: var(--ok); }
.lesson-done { margin: 8px 0 24px; padding: 16px 18px; border-radius: 12px; background: var(--ok-soft); border: 1px solid color-mix(in srgb, var(--ok) 40%, transparent); color: var(--text); }
.pager { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 40px; }
.pager a { display: flex; flex-direction: column; gap: 2px; padding: 14px 16px; border: 1px solid var(--border); border-radius: 12px; background: var(--surface); color: var(--text); font-weight: 650; }
.pager a:hover { border-color: var(--teal); text-decoration: none; }
.pager-next { text-align: right; grid-column: 2; }
.pager .muted { font: .78rem var(--mono); font-weight: 500; }

/* SQL tables */
.tables { margin: 1.2em 0; border: 1px solid var(--border); border-radius: 12px; padding: 4px 16px 12px; background: var(--surface); }
.tables > summary { cursor: pointer; padding: 10px 0; font-weight: 650; }
.setup-src summary { cursor: pointer; color: var(--muted); font-size: .88rem; margin-top: 8px; }
.dbtable { margin: 8px 0 14px; }
.dbtable-name { font: 700 .85rem var(--mono); color: var(--text); margin-bottom: 6px; }
.dbtable-name .muted { font-weight: 400; }
.tscroll { overflow-x: auto; border: 1px solid var(--border); border-radius: 8px; max-width: 100%; }
.dbtable table { border-collapse: collapse; font: .84rem/1.4 var(--mono); width: max-content; min-width: 100%; }
.dbtable th, .dbtable td { padding: 6px 12px; text-align: left; border-bottom: 1px solid var(--border); white-space: nowrap; }
.dbtable th { background: var(--surface2); color: var(--text); font-weight: 700; position: sticky; top: 0; }
.dbtable td { color: var(--text2); }
.dbtable tr:last-child td { border-bottom: 0; }
.null { color: var(--muted); font-style: italic; }

/* ---------- runbox ---------- */
.runbox { border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); overflow: hidden; margin: 12px 0; }
.editor-wrap { background: var(--code-bg); border-bottom: 1px solid var(--border); }
.editor { min-height: 60px; }
.runbox .editor .cm-editor { max-height: 460px; }
.toolbar { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; padding: 10px 12px; background: var(--surface); }
.kbd-hint { font: .75rem var(--mono); color: var(--muted); margin-left: 4px; }
.run-state { margin-left: auto; font: .78rem var(--mono); color: var(--muted); }
.run-state.ok { color: var(--ok); }
.run-state.bad { color: var(--bad); }
.is-running .btn-run, .is-running .btn-check { opacity: .65; pointer-events: none; }
.is-running .run-state::before { content: ""; display: inline-block; width: 9px; height: 9px; margin-right: 6px; border-radius: 50%; border: 2px solid var(--teal); border-right-color: transparent; animation: spin .7s linear infinite; vertical-align: -1px; }
@keyframes spin { to { transform: rotate(360deg); } }
.output { border-top: 1px solid var(--border); background: var(--code-bg); padding: 12px 14px; max-height: 420px; overflow: auto; }
.console-out { margin: 0; font: .88rem/1.5 var(--mono); white-space: pre-wrap; word-break: break-word; color: var(--text); }
.console-out .err, .console .err { color: var(--bad); }
.error-block { margin-top: 8px; padding: 10px 12px; border-radius: 8px; background: var(--bad-soft); color: var(--bad); font: .85rem/1.5 var(--mono); white-space: pre-wrap; word-break: break-word; }
.sql-note { font: .82rem var(--mono); color: var(--muted); margin: 4px 0 8px; }
iframe.preview { display: block; width: 100%; height: 260px; border: 1px solid var(--border); border-radius: 8px; background: #fff; }
.output .console-out { margin-top: 8px; }
.output iframe + .console-out { padding-top: 8px; border-top: 1px dashed var(--border); }
.stdin { display: block; padding: 10px 12px 0; font-size: .82rem; color: var(--text2); }
.stdin > span { display: block; margin-bottom: 4px; font-weight: 600; }
.stdin textarea { width: 100%; resize: vertical; padding: 8px 10px; border-radius: 8px; border: 1px solid var(--border2); background: var(--code-bg); color: var(--text); font: 15px/1.4 var(--mono); }
.hints { padding: 4px 14px 2px; border-top: 1px solid var(--border); background: var(--purple-soft); }
.hint { margin: 8px 0; color: var(--text2); font-size: .95rem; }
.feedback { padding: 12px 14px; border-top: 1px solid var(--border); font-size: .95rem; }
.feedback.pass { background: var(--ok-soft); color: var(--ok); }
.feedback.fail { background: var(--bad-soft); color: var(--text2); }
.feedback.fail > strong { color: var(--bad); }
.feedback p { margin: 8px 0 0; }
.compare { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 10px; }
.compare > div { min-width: 0; }
.cmp-h { display: block; font: 700 .72rem var(--mono); text-transform: uppercase; letter-spacing: .06em; color: var(--muted); margin-bottom: 4px; }
.compare pre { margin: 0; padding: 8px 10px; border-radius: 8px; background: var(--code-bg); border: 1px solid var(--border); font: .84rem/1.5 var(--mono); white-space: pre-wrap; word-break: break-word; color: var(--text); }
.compare .diff { background: var(--bad-soft); color: var(--bad); border-radius: 3px; }
.want { margin-top: 10px; } .want summary { cursor: pointer; color: var(--text2); }
.solution { padding: 12px 14px; border-top: 1px solid var(--border); background: var(--surface2); }
.solution pre { margin: 8px 0 10px; }

/* CodeMirror */
.cm-editor { background: var(--code-bg); color: var(--text); font-size: 14.5px; }
.cm-editor.cm-focused { outline: none; }
.cm-scroller { font-family: var(--mono) !important; line-height: 1.6 !important; }
.cm-content { padding: 12px 0 !important; caret-color: var(--teal); }
.cm-gutters { background: var(--code-bg) !important; color: var(--muted) !important; border-right: 1px solid var(--border) !important; opacity: .8; }
.cm-activeLine { background: color-mix(in srgb, var(--teal) 6%, transparent) !important; }
.cm-activeLineGutter { background: transparent !important; color: var(--text) !important; }
.cm-cursor { border-left: 2px solid var(--teal) !important; }
.cm-selectionBackground, .cm-focused .cm-selectionBackground, ::selection { background: color-mix(in srgb, var(--teal) 28%, transparent) !important; }
.cm-matchingBracket { background: color-mix(in srgb, var(--purple) 30%, transparent) !important; outline: none; }

/* ---------- playground ---------- */
.page-pg .footer { display: none; }
.pg { display: flex; flex-direction: column; height: calc(100vh - var(--top-h, 58px)); height: calc(100dvh - var(--top-h, 58px)); }
.pg-bar { display: flex; align-items: center; gap: 12px; padding: 8px var(--gutter); border-bottom: 1px solid var(--border); background: var(--surface); flex-wrap: wrap; }
.pg-tabs { display: flex; gap: 4px; overflow-x: auto; scrollbar-width: none; }
.pg-tabs a { padding: 6px 12px; border-radius: 8px; color: var(--text2); font: 600 .88rem var(--mono); white-space: nowrap; }
.pg-tabs a:hover { background: var(--surface2); text-decoration: none; }
.pg-tabs a[aria-current="page"] { background: var(--teal-soft); color: var(--teal); }
.pg-actions { margin-left: auto; display: flex; align-items: center; gap: 8px; }
.pg-actions .run-state { margin: 0 6px 0 0; }
.pg-project { padding: 10px var(--gutter); border-bottom: 1px solid var(--border); background: var(--purple-soft); font-size: .92rem; }
.pg-project ol { margin: 4px 0 0; padding-left: 1.3em; color: var(--text2); }
.pg-switch { display: none; }
.pg-split { --left: 55%; flex: 1; min-height: 0; display: grid; grid-template-columns: var(--left) 6px 1fr; }
.pg-pane { min-width: 0; min-height: 0; display: flex; flex-direction: column; }
.pg-code { background: var(--code-bg); }
.pg-code .editor { flex: 1; min-height: 0; overflow: hidden; display: flex; }
.pg-code .editor .cm-editor { flex: 1; height: 100%; }
.pg-gutter { cursor: col-resize; background: var(--border); }
.pg-gutter:hover { background: var(--teal); }
.pg-out { background: var(--code-bg); }
.pane-head { display: flex; align-items: center; justify-content: space-between; padding: 6px 12px; border-bottom: 1px solid var(--border); font: 600 .78rem var(--mono); text-transform: uppercase; letter-spacing: .06em; color: var(--muted); }
.pg-out .preview { flex: 1 1 60%; height: auto; min-height: 120px; border: 0; border-radius: 0; border-bottom: 1px solid var(--border); }
.console { flex: 1 1 40%; overflow: auto; padding: 12px 14px; font: .9rem/1.55 var(--mono); white-space: pre-wrap; word-break: break-word; color: var(--text); }
.console .dbtable { white-space: normal; }
.pg-stdin { padding: 10px 12px 12px; border-top: 1px solid var(--border); }
.pg-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 14px; margin-bottom: 80px; }
.pg-card { display: flex; flex-direction: column; gap: 8px; padding: 20px; background: var(--surface); border: 1px solid var(--border); border-radius: 14px; color: var(--text); }
.pg-card:hover { border-color: var(--teal); text-decoration: none; }

/* ---------- footer, toast, 404 ---------- */
.footer { border-top: 1px solid var(--border); margin-top: 40px; background: var(--bg2); }
.footer-in { max-width: 1120px; margin: 0 auto; padding: 40px var(--gutter) 36px; display: grid; grid-template-columns: 1.5fr repeat(3, 1fr); gap: 28px 32px; }
.footer p { margin: 10px 0 0; font-size: .92rem; }
.f-brand p { max-width: 30rem; }
.f-col { display: flex; flex-direction: column; gap: 8px; align-items: flex-start; }
.f-h { margin: 0 0 2px !important; font: 700 .75rem/1.2 var(--mono) !important; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); }
.footer nav a { color: var(--text2); font-size: .92rem; }
.fine { grid-column: 1 / -1; font-size: .8rem !important; }
.toast { position: fixed; left: 50%; bottom: 24px; transform: translate(-50%, 20px); opacity: 0; z-index: 90; max-width: calc(100vw - 32px); padding: 12px 18px; border-radius: 12px; background: var(--text); color: var(--bg); font-weight: 600; font-size: .93rem; box-shadow: var(--shadow); transition: opacity .25s, transform .25s; }
.toast.show { opacity: 1; transform: translate(-50%, 0); }
.notfound pre { max-width: 560px; }
.notfound .btn { margin: 0 8px 8px 0; }
.nf-grid { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 40px; align-items: center; padding-bottom: 48px; }
.nf-noodle { max-width: 40vw; }
.nf-tracks-h { margin: 18px 0 8px; font-weight: 650; }
.nf-tracks { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 8px; }
.nf-tracks a { display: inline-block; padding: 7px 12px; border-radius: 9px; border: 1px solid var(--border); background: var(--surface); color: var(--text); font-weight: 600; }
.nf-tracks a:hover { border-color: var(--teal); text-decoration: none; }
.start-band { margin-top: 72px; }
.start-in { display: flex; align-items: center; gap: 32px; padding: 32px; border: 1px solid var(--border); border-radius: 18px; background: linear-gradient(120deg, var(--teal-soft), var(--purple-soft)), var(--surface); }
.start-in h2 { margin-bottom: .35em; }
.start-in .hero-cta { margin: 20px 0 0; }
.start-noodle { flex: none; }
.wl-box { display: flex; flex-direction: column; gap: 8px; }
.wl-label { font: 600 .78rem var(--mono); text-transform: uppercase; letter-spacing: .07em; color: var(--muted); }
.wl-row { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.wl-addr { flex: 1 1 220px; padding: 11px 14px; border-radius: 10px; border: 1px solid var(--border2); background: var(--surface); color: var(--text); font-size: 1rem; user-select: all; -webkit-user-select: all; overflow-wrap: anywhere; }

/* ---------- responsive ---------- */
@media (max-width: 960px) {
  .hero-in { grid-template-columns: 1fr; padding-top: 48px; gap: 32px; }
  .lesson-layout { grid-template-columns: 1fr; gap: 0; }
  .sidebar { position: static; max-height: none; padding: 18px 0 0; border-bottom: 1px solid var(--border); }
  .lesson { padding-top: 20px; }
  .waitlist { grid-template-columns: 1fr; }
  .footer-in { grid-template-columns: repeat(3, 1fr); }
  .f-brand, .fine { grid-column: 1 / -1; }
}
@media (max-width: 800px) {
  .pg-switch { display: flex; border-bottom: 1px solid var(--border); background: var(--surface); }
  .pg-switch button { flex: 1; padding: 10px; background: none; border: 0; border-bottom: 2px solid transparent; color: var(--muted); font: 650 .92rem var(--sans); cursor: pointer; }
  .pg-switch button[aria-selected="true"] { color: var(--teal); border-bottom-color: var(--teal); }
  .pg-split { display: block; position: relative; }
  .pg-gutter { display: none; }
  .pg-pane { height: 100%; }
  .pg[data-show="code"] .pg-out, .pg[data-show="out"] .pg-code { display: none; }
  .pg-bar { padding: 8px 12px; }
  .pg-tabs { flex: 1 1 100%; order: 2; }
  .pg-actions { margin-left: 0; flex: 1 1 100%; order: 1; justify-content: flex-end; }
}
@media (max-width: 720px) {
  .topbar-in { height: auto; min-height: 54px; flex-wrap: wrap; gap: 4px 12px; padding-top: 8px; padding-bottom: 0; }
  .nav { order: 3; flex: 1 1 100%; margin: 0 -6px; overflow-x: auto; scrollbar-width: none; padding-bottom: 6px; }
  .nav a { padding: 6px 9px; font-size: .9rem; white-space: nowrap; }
  .sidebar { top: 0; }
  .footer-in { grid-template-columns: 1fr 1fr; }
  .nf-grid { grid-template-columns: minmax(0, 1fr); gap: 8px; }
  .nf-noodle { order: -1; width: 120px !important; }
  .start-in { flex-direction: column; align-items: flex-start; padding: 22px; gap: 12px; }
  .start-noodle { width: 110px !important; }
  .compare { grid-template-columns: 1fr; }
  .track-list a { grid-template-columns: 24px 1fr; padding: 14px; }
  .track-list .n, .track-list .tl-ex { display: none; }
  .pager { grid-template-columns: 1fr; }
  .pager-next { grid-column: 1; }
  .cm-editor { font-size: 16px; }
  .kbd-hint { display: none; }
  .toolbar .btn { padding: 8px 12px; }
  .sec-head-lg { margin-top: 52px; }
  .demo-tip { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; }
}

/* code blocks inside prose: no per-line pill, and no ligatures (show => as typed) */
.prose pre code { background: none; border: 0; padding: 0; font-size: inherit; color: inherit; }
code, pre, kbd, .cm-editor, .cm-scroller, .console, .console-out { font-variant-ligatures: none; font-feature-settings: "liga" 0, "calt" 0; }

/* ---------- Dev Noodle ---------- */
.noodle-says { display: flex; align-items: flex-end; gap: 12px; margin-top: 12px; white-space: normal; font-family: var(--sans); }
.noodle-says img { flex: none; width: 108px; height: auto; margin: 0 -8px -4px -10px; }
.ns-bubble { position: relative; flex: 1; min-width: 0; padding: 12px 14px; border-radius: 14px 14px 14px 4px; background: var(--surface2); border: 1px solid var(--border2); color: var(--text2); font-size: .93rem; line-height: 1.5; }
.ns-bubble strong { display: block; color: var(--text); font-size: .85rem; margin-bottom: 2px; }
.ns-bubble p { margin: 0; }
.noodle-wait { display: flex; align-items: center; gap: 12px; margin: 4px 0; white-space: normal; font: .9rem/1.5 var(--sans); color: var(--text2); }
.noodle-wait img { flex: none; width: 64px; height: auto; }
.noodle-art { display: block; height: auto; }
.noodle-art svg { display: block; width: 100%; height: auto; }
.pg-empty { display: flex; align-items: center; gap: 14px; white-space: normal; font-family: var(--sans); color: var(--muted); }
.pg-empty .noodle-art { width: 88px; flex: none; }
.pg-empty p { margin: 0; }
@media (max-width: 420px) {
  .noodle-says img { width: 88px; }
}
.steps code, .pg-project code { font-size: .88em; background: var(--surface2); border: 1px solid var(--border); padding: .05em .35em; border-radius: 5px; color: var(--text); overflow-wrap: anywhere; }
@media (max-width: 400px) {
  .pg-tabs a { padding: 6px 8px; font-size: .84rem; }
  .pg-tabs { gap: 2px; }
}
.nav .nav-ext { display: inline-flex; align-items: center; gap: 6px; }
.nav-glyph svg { width: 18px; height: 18px; display: block; }
.bar { background: var(--border); }