/* Databricks Zero to Advanced
   Layout concept: a course shell. Sticky header, a left "course map" (levels > modules > topics),
   one reading column, and code that looks like notebook cells. */

:root {
  --font-ui: "Familjen Grotesk", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-body: "Source Serif 4", Georgia, "Times New Roman", serif;
  --font-code: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --bg: #F5F7F6;
  --surface: #FFFFFF;
  --surface-2: #EBEFEE;
  --ink: #13201F;
  --ink-2: #44524F;
  --ink-3: #5C6B68;
  --line: #D6DDDB;
  --line-strong: #B5C0BD;

  --accent: #0B5C63;
  --accent-ink: #FFFFFF;
  --accent-soft: #DCEEEE;

  --ok: #2A7048;
  --ok-soft: #E0F1E6;
  --warn: #8F5A0C;
  --warn-soft: #F8ECD2;
  --bad: #A63427;
  --bad-soft: #F7E1DD;
  --info: #40566B;
  --info-soft: #E4EBF1;

  --bronze: #A5693A;
  --silver: #8E9BA0;
  --gold: #C79A2E;

  --header-h: 60px;
  --radius: 4px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0D1413;
    --surface: #131C1B;
    --surface-2: #1A2524;
    --ink: #E3EBE9;
    --ink-2: #A9B8B5;
    --ink-3: #8A9B98;
    --line: #273533;
    --line-strong: #3A4B48;
    --accent: #62C7CB;
    --accent-ink: #06191B;
    --accent-soft: #12363A;
    --ok: #74D096;
    --ok-soft: #12301E;
    --warn: #E6B766;
    --warn-soft: #332710;
    --bad: #F2917F;
    --bad-soft: #3A1B17;
    --info: #A5BACE;
    --info-soft: #1C2833;
    --bronze: #C58A55;
    --silver: #A9B5BA;
    --gold: #DDB24A;
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --bg: #0D1413;
  --surface: #131C1B;
  --surface-2: #1A2524;
  --ink: #E3EBE9;
  --ink-2: #A9B8B5;
  --ink-3: #8A9B98;
  --line: #273533;
  --line-strong: #3A4B48;
  --accent: #62C7CB;
  --accent-ink: #06191B;
  --accent-soft: #12363A;
  --ok: #74D096;
  --ok-soft: #12301E;
  --warn: #E6B766;
  --warn-soft: #332710;
  --bad: #F2917F;
  --bad-soft: #3A1B17;
  --info: #A5BACE;
  --info-soft: #1C2833;
  --bronze: #C58A55;
  --silver: #A9B5BA;
  --gold: #DDB24A;
  color-scheme: dark;
}

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

:root {
  padding-top: env(safe-area-inset-top, 0px);
  padding-bottom: env(safe-area-inset-bottom, 0px);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + 20px); }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.65;
  -webkit-text-size-adjust: 100%;
}

body::before {
  content: "";
  position: fixed;
  inset: 0 0 auto;
  height: env(safe-area-inset-top, 0px);
  background: var(--bg);
  z-index: 30;
}

.site { min-height: 100vh; }

.wrap {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding-left: max(16px, env(safe-area-inset-left, 0px));
  padding-right: max(16px, env(safe-area-inset-right, 0px));
}

a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 2px; }

h1, h2, h3, h4 {
  font-family: var(--font-ui);
  line-height: 1.15;
  letter-spacing: -0.01em;
  text-wrap: balance;
  margin: 0;
  color: var(--ink);
}

img, svg { max-width: 100%; }

code, kbd { font-family: var(--font-code); }

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}

/* ---------- header ---------- */

.top {
  position: sticky;
  top: env(safe-area-inset-top, 0px);
  z-index: 20;
  background: var(--bg);
  border-bottom: 1px solid var(--line);
}

.top .wrap {
  height: var(--header-h);
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand {
  display: flex; align-items: center; gap: 10px;
  font-family: var(--font-ui); font-weight: 700; font-size: 1.08rem;
  letter-spacing: -0.01em;
  color: var(--ink); text-decoration: none; white-space: nowrap;
}
.brand:hover { text-decoration: none; }
.brand svg { width: 26px; height: 26px; flex: none; }
.brand .sub { color: var(--ink-3); font-weight: 500; }

.search { position: relative; flex: 1 1 auto; min-width: 0; max-width: 440px; margin-left: auto; }
.search input {
  width: 100%;
  font: 500 0.92rem var(--font-ui);
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  padding: 9px 36px 9px 12px;
}
.search input::placeholder { color: var(--ink-3); }
.search kbd {
  position: absolute; right: 9px; top: 50%; transform: translateY(-50%);
  font-size: 0.72rem; color: var(--ink-3);
  border: 1px solid var(--line-strong); border-radius: 3px; padding: 0 5px;
  pointer-events: none;
}
.results {
  position: absolute; left: 0; right: 0; top: calc(100% + 6px);
  background: var(--surface);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.18);
  max-height: min(70vh, 460px); overflow: auto;
  padding: 6px;
  z-index: 40;
}
.results a, .results .planned {
  display: block; padding: 8px 10px; border-radius: 3px;
  font-family: var(--font-ui); font-size: 0.92rem; line-height: 1.3;
  color: var(--ink); text-decoration: none;
}
.results a:hover, .results a:focus { background: var(--accent-soft); }
.results .planned { color: var(--ink-3); }
.results small { display: block; color: var(--ink-3); font-size: 0.78rem; margin-top: 2px; }
.results .none { padding: 10px; color: var(--ink-3); font-family: var(--font-ui); font-size: 0.9rem; }

.btn-quiet {
  font: 600 0.82rem var(--font-ui);
  color: var(--ink-2);
  background: transparent;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  padding: 8px 11px;
  cursor: pointer;
  white-space: nowrap;
}
.btn-quiet:hover { color: var(--ink); border-color: var(--ink-3); }
.menu-btn { display: none; }

/* ---------- shell ---------- */

.shell {
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr);
  gap: 56px;
  align-items: start;
  padding-top: 32px;
  padding-bottom: 96px;
}

.course-map {
  position: sticky;
  top: calc(var(--header-h) + env(safe-area-inset-top, 0px) + 20px);
  max-height: calc(100vh - var(--header-h) - env(safe-area-inset-top, 0px) - 40px);
  overflow-y: auto;
  padding-right: 8px;
  font-family: var(--font-ui);
  font-size: 0.9rem;
  line-height: 1.3;
  scrollbar-width: thin;
}
.map-title {
  font-size: 0.72rem; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--ink-3); margin-bottom: 10px;
}
.map-home { display: block; margin-bottom: 14px; font-weight: 600; text-decoration: none; color: var(--ink); }
.map-home:hover { color: var(--accent); }

.level { margin-bottom: 16px; }
.level-head {
  display: flex; align-items: center; gap: 8px;
  font-weight: 700; color: var(--ink);
  padding: 4px 0 6px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 4px;
}
.level-head .tier-name { margin-left: auto; font-weight: 500; font-size: 0.78rem; color: var(--ink-3); }
.course-map ul { list-style: none; margin: 0; padding: 0; }
.mod > a, .mod > .mod-name {
  display: flex; gap: 8px; align-items: baseline;
  padding: 6px 6px; border-radius: 3px;
  color: var(--ink-2); text-decoration: none;
}
.mod > a:hover { background: var(--surface-2); color: var(--ink); }
.mod .mn { font-family: var(--font-code); font-size: 0.74rem; color: var(--ink-3); min-width: 1.6em; }
.mod .count { margin-left: auto; font-family: var(--font-code); font-size: 0.72rem; color: var(--ink-3); white-space: nowrap; }
.mod.planned > .mod-name { color: var(--ink-3); }
.mod.planned .tag {
  margin-left: auto; font-size: 0.68rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--ink-3);
}
.mod.is-current > a { background: var(--accent-soft); color: var(--ink); font-weight: 600; }
.topics { list-style: none; margin: 2px 0 8px 14px; padding: 0 0 0 10px; border-left: 1px solid var(--line); }
.topics a {
  display: block; padding: 4px 6px; color: var(--ink-2); text-decoration: none; border-radius: 3px;
  font-size: 0.84rem;
}
.topics a:hover { color: var(--ink); background: var(--surface-2); }
.topics a.done::after { content: "\2713"; color: var(--ok); margin-left: 6px; font-weight: 700; }

/* difficulty bars: encode the tier of the level */
.bars { display: inline-flex; align-items: flex-end; gap: 2px; height: 14px; flex: none; }
.bars i { width: 4px; background: var(--line-strong); border-radius: 1px; }
.bars i:nth-child(1) { height: 5px; }
.bars i:nth-child(2) { height: 8px; }
.bars i:nth-child(3) { height: 11px; }
.bars i:nth-child(4) { height: 14px; }
.bars i.on { background: var(--accent); }

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

.hero { padding: 56px 0 36px; border-bottom: 1px solid var(--line); }
.hero .wrap { display: grid; grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr); gap: 56px; align-items: end; }
.eyebrow {
  font: 700 0.74rem var(--font-ui); letter-spacing: 0.14em; text-transform: uppercase; color: var(--accent);
  margin-bottom: 14px;
}
.hero h1 { font-size: clamp(2.2rem, 5.2vw, 3.7rem); font-weight: 700; letter-spacing: -0.025em; line-height: 1.04; }
.hero .lede { margin: 20px 0 0; font-size: 1.18rem; color: var(--ink-2); max-width: 36em; }
.cta-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.btn {
  display: inline-block;
  font: 700 0.95rem var(--font-ui);
  padding: 11px 18px;
  border-radius: var(--radius);
  text-decoration: none;
  border: 1px solid var(--accent);
  background: var(--accent); color: var(--accent-ink);
}
.btn:hover { filter: brightness(1.08); text-decoration: none; }
.btn.ghost { background: transparent; color: var(--accent); }
.hero-side { font-family: var(--font-ui); font-size: 0.95rem; color: var(--ink-2); }
.hero-side h2 { font-size: 0.74rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink-3); margin-bottom: 10px; }
.hero-side dl { margin: 0; display: grid; grid-template-columns: auto 1fr; gap: 8px 16px; }
.hero-side dt { font-weight: 700; color: var(--ink); }
.hero-side dd { margin: 0; }

.status-line {
  display: inline-flex; gap: 10px; align-items: center; flex-wrap: wrap;
  font: 600 0.82rem var(--font-ui); color: var(--ink-2);
  margin-top: 22px;
}
.status-line b { color: var(--ink); }

.section { padding: 44px 0 8px; }
.section > .wrap > h2 { font-size: 1.5rem; margin-bottom: 8px; }
.section .sub { color: var(--ink-2); max-width: 44em; margin: 0 0 22px; }

.how { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 28px; margin-top: 18px; }
.how h3 { font-size: 1.05rem; margin-bottom: 6px; }
.how p { margin: 0; color: var(--ink-2); font-size: 0.98rem; }

.legend { display: flex; flex-wrap: wrap; gap: 8px 18px; margin-top: 18px; font-family: var(--font-ui); font-size: 0.86rem; color: var(--ink-2); }

.road-level { margin-top: 34px; }
.road-head {
  display: flex; align-items: center; gap: 12px;
  font-family: var(--font-ui);
  padding-bottom: 10px; border-bottom: 1px solid var(--line-strong); margin-bottom: 16px;
}
.road-head h3 { font-size: 1.2rem; }
.road-head .tier-name { color: var(--ink-3); font-size: 0.86rem; margin-left: auto; }
.cards { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.card {
  display: flex; flex-direction: column; gap: 8px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px 18px 14px;
  color: var(--ink); text-decoration: none;
  min-width: 0;
}
a.card:hover { border-color: var(--accent); text-decoration: none; }
.card .k { font: 700 0.72rem var(--font-ui); letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-3); }
.card h4 { font-size: 1.08rem; line-height: 1.25; }
.card p { margin: 0; color: var(--ink-2); font-size: 0.95rem; line-height: 1.5; }
.card .foot { margin-top: auto; padding-top: 8px; display: flex; flex-wrap: wrap; gap: 8px 14px; align-items: center; font: 600 0.8rem var(--font-ui); color: var(--ink-3); }
.card.planned { background: transparent; border-style: dashed; }
.card.planned h4 { color: var(--ink-2); }
.meter { height: 3px; background: var(--surface-2); border-radius: 2px; overflow: hidden; }
.meter > span { display: block; height: 100%; width: 0; background: var(--accent); }

.chip {
  display: inline-flex; align-items: center; gap: 6px;
  font: 700 0.72rem var(--font-ui); letter-spacing: 0.04em;
  padding: 2px 8px; border-radius: 999px;
  border: 1px solid var(--line-strong); color: var(--ink-2); background: transparent;
  white-space: nowrap;
}
.chip::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: currentColor; }
.chip.hands-on { color: var(--ok); border-color: var(--ok); background: var(--ok-soft); }
.chip.caveat { color: var(--warn); border-color: var(--warn); background: var(--warn-soft); }
.chip.concept { color: var(--info); border-color: var(--info); background: var(--info-soft); }
.chip.reference { color: var(--ink-2); }
.chip.ready { color: var(--accent); border-color: var(--accent); background: var(--accent-soft); }
.chip.ready::before { display: none; }
.chip.planned-chip { border-style: dashed; color: var(--ink-3); }
.chip.planned-chip::before { display: none; }

.footer { border-top: 1px solid var(--line); margin-top: 64px; padding: 28px 0 56px; font: 0.9rem/1.55 var(--font-ui); color: var(--ink-3); }
.footer p { margin: 0 0 8px; max-width: 60em; }

/* ---------- module page ---------- */

.module-head { padding-bottom: 26px; border-bottom: 1px solid var(--line); margin-bottom: 8px; }
.crumbs { font: 600 0.8rem var(--font-ui); color: var(--ink-3); display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin-bottom: 14px; }
.crumbs a { color: var(--ink-3); }
.module-head h1 { font-size: clamp(1.9rem, 4vw, 2.7rem); letter-spacing: -0.02em; }
.module-head .summary { font-size: 1.15rem; color: var(--ink-2); margin: 14px 0 0; max-width: 38em; }
.meta-row { display: flex; flex-wrap: wrap; gap: 10px 18px; margin-top: 18px; align-items: center; font: 600 0.84rem var(--font-ui); color: var(--ink-2); }
.meta-row .progress-text { color: var(--ink-3); }

details.topics-inline { display: none; margin: 18px 0 0; font-family: var(--font-ui); font-size: 0.92rem; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
details.topics-inline summary { cursor: pointer; padding: 10px 14px; font-weight: 700; }
details.topics-inline ol { margin: 0; padding: 4px 14px 12px 36px; color: var(--ink-2); }
details.topics-inline li { padding: 2px 0; }

.intro { padding-top: 24px; }

.lesson { padding: 44px 0 8px; border-bottom: 1px solid var(--line); }
.lesson:last-of-type { border-bottom: 0; }
.lesson-head { margin-bottom: 18px; }
.kicker { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; font: 700 0.76rem var(--font-ui); letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-3); margin-bottom: 10px; }
.kicker .no { font-family: var(--font-code); letter-spacing: 0; font-size: 0.8rem; color: var(--ink-2); }
.lesson h2 { font-size: clamp(1.5rem, 3vw, 2rem); letter-spacing: -0.015em; }
.goal { margin: 12px 0 0; padding: 10px 14px; background: var(--surface-2); border-radius: var(--radius); font: 500 0.98rem/1.5 var(--font-ui); color: var(--ink-2); }
.goal b { color: var(--ink); }

.lesson-body > * { min-width: 0; }
.lesson-body p, .lesson-body ul, .lesson-body ol, .intro p, .intro ul, .intro ol { max-width: 68ch; }
.lesson-body h3 { font-size: 1.22rem; margin: 30px 0 8px; }
.lesson-body h4 { font-size: 1.02rem; margin: 22px 0 6px; }
.lesson-body p { margin: 0 0 1em; }
.lesson-body li { margin: 0.3em 0; }
.lesson-body :not(pre) > code, .intro :not(pre) > code {
  font-size: 0.86em; background: var(--surface-2); border: 1px solid var(--line);
  padding: 0.05em 0.34em; border-radius: 3px; color: var(--ink);
  overflow-wrap: anywhere;
}
.lesson-body strong { font-weight: 600; }
.lesson-body blockquote { margin: 1em 0; padding: 0 0 0 16px; border-left: 2px solid var(--line-strong); color: var(--ink-2); }

.lesson-foot { padding: 22px 0 30px; }
.done-box { display: inline-flex; align-items: center; gap: 10px; font: 600 0.9rem var(--font-ui); color: var(--ink-2); cursor: pointer; }
.done-box input { width: 18px; height: 18px; accent-color: var(--accent); }

/* tables */
.table-wrap { overflow-x: auto; margin: 1.2em 0; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
.table-wrap table { border-collapse: collapse; width: 100%; font: 0.92rem/1.45 var(--font-ui); }
.table-wrap th, .table-wrap td { text-align: left; vertical-align: top; padding: 9px 12px; border-bottom: 1px solid var(--line); }
.table-wrap th { background: var(--surface-2); font-weight: 700; font-size: 0.82rem; letter-spacing: 0.02em; white-space: nowrap; }
.table-wrap tr:last-child td { border-bottom: 0; }
.table-wrap td code { font-size: 0.84em; }

/* notebook-style code cells */
.cell { margin: 1.2em 0; border: 1px solid var(--line-strong); border-radius: var(--radius); background: var(--surface); overflow: hidden; }
.cell-bar {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 6px 8px 6px 12px;
  background: var(--surface-2);
  border-bottom: 1px solid var(--line);
  font: 700 0.72rem var(--font-ui); letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-3);
}
.cell-bar .lang::before { content: "\25B6"; font-size: 0.62rem; margin-right: 8px; color: var(--accent); }
.copy {
  font: 600 0.74rem var(--font-ui); letter-spacing: 0.02em; text-transform: none;
  color: var(--ink-2); background: transparent; border: 1px solid transparent; border-radius: 3px;
  padding: 3px 8px; cursor: pointer;
}
.copy:hover { border-color: var(--line-strong); color: var(--ink); }
.cell pre { margin: 0; padding: 14px 16px; overflow-x: auto; background: var(--surface); }
.cell code { font-size: 0.86rem; line-height: 1.6; color: var(--ink); white-space: pre; display: block; }

.out { margin: -0.6em 0 1.4em; border: 1px dashed var(--line-strong); border-radius: var(--radius); background: var(--bg); overflow: hidden; }
.out-label { padding: 5px 12px; font: 700 0.7rem var(--font-ui); letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-3); border-bottom: 1px dashed var(--line); }
.out pre { margin: 0; padding: 12px 16px; overflow-x: auto; font: 0.84rem/1.55 var(--font-code); color: var(--ink-2); }

/* highlight.js tokens (colors come from theme tokens) */
.hljs-keyword, .hljs-selector-tag, .hljs-literal, .hljs-doctag, .hljs-meta .hljs-keyword { color: var(--accent); font-weight: 500; }
.hljs-string, .hljs-regexp, .hljs-template-variable, .hljs-addition { color: var(--ok); }
.hljs-number, .hljs-symbol, .hljs-bullet { color: var(--warn); }
.hljs-comment, .hljs-quote { color: var(--ink-3); font-style: italic; }
.hljs-built_in, .hljs-type, .hljs-attr, .hljs-attribute, .hljs-variable, .hljs-property { color: var(--info); }
.hljs-title, .hljs-title.function_, .hljs-section, .hljs-name { color: var(--ink); font-weight: 600; }
.hljs-meta, .hljs-meta .hljs-string { color: var(--ink-3); }
.hljs-params, .hljs-subst { color: var(--ink); }

/* callouts */
.admonition {
  --tone: var(--info); --tone-soft: var(--info-soft);
  margin: 1.4em 0; padding: 12px 16px 6px;
  border: 1px solid var(--tone); border-radius: var(--radius);
  background: var(--tone-soft);
  font: 0.98rem/1.55 var(--font-body);
}
.admonition > * { max-width: 66ch; }
.admonition { max-width: calc(66ch + 34px); }
.admonition p { margin: 0 0 0.7em; }
.admonition ul, .admonition ol { margin: 0 0 0.7em; padding-left: 1.3em; }
.admonition code { font-size: 0.85em; background: transparent !important; border: 0 !important; padding: 0 !important; color: inherit; }
.admonition-title { font: 700 0.72rem var(--font-ui) !important; letter-spacing: 0.12em; text-transform: uppercase; color: var(--tone); margin: 0 0 0.5em !important; }
.admonition.best { --tone: var(--accent); --tone-soft: var(--accent-soft); }
.admonition.free { --tone: var(--ok); --tone-soft: var(--ok-soft); }
.admonition.pitfall { --tone: var(--bad); --tone-soft: var(--bad-soft); }
.admonition.caveat { --tone: var(--warn); --tone-soft: var(--warn-soft); }
.admonition.remember { --tone: var(--accent); --tone-soft: var(--accent-soft); }
.admonition.remember p { margin: 0; font-weight: 600; }
figure.note-diagram { display: block; width: fit-content; max-width: 100%; padding-right: 18px; }
figure.note-diagram figcaption { margin-top: 8px; }
.lesson-body ul { padding-left: 1.25em; }
.lesson-body ul li::marker { color: var(--accent); }
.admonition.run { --tone: var(--ink); --tone-soft: var(--surface); border-width: 1.5px; }
.admonition.run .admonition-title::before { content: "\25B6"; margin-right: 8px; color: var(--accent); }
.admonition.run ol { padding-left: 1.5em; }

/* checkpoint */
details.check { margin: 1.6em 0; border: 1px dashed var(--line-strong); border-radius: var(--radius); background: var(--surface); }
details.check > summary { cursor: pointer; padding: 10px 14px; font: 700 0.9rem var(--font-ui); color: var(--ink); list-style-position: inside; }
details.check > *:not(summary) { padding-left: 16px; padding-right: 16px; }
details.check ol { margin: 0 0 12px; padding-left: 36px; }
details.check li { margin-bottom: 0.8em; }
details.check em { color: var(--ink-2); }

/* diagrams */
figure.diagram { margin: 1.6em 0; padding: 16px 12px 10px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); overflow-x: auto; }
figure.diagram svg { display: block; width: 100%; height: auto; min-width: 560px; color: var(--ink); }
figure.diagram figcaption { margin-top: 10px; font: 0.88rem/1.5 var(--font-ui); color: var(--ink-3); max-width: 62em; }
.d-box { fill: var(--surface); stroke: var(--line-strong); stroke-width: 1.2; }
.d-soft { fill: var(--surface-2); stroke: var(--line-strong); stroke-width: 1; }
.d-accent { fill: var(--accent-soft); stroke: var(--accent); stroke-width: 1.4; }
.d-ok { fill: var(--ok-soft); stroke: var(--ok); stroke-width: 1.4; }
.d-warn { fill: var(--warn-soft); stroke: var(--warn); stroke-width: 1.4; }
.d-line { stroke: currentColor; stroke-width: 1.4; fill: none; }
.d-dash { stroke: currentColor; stroke-width: 1.2; fill: none; stroke-dasharray: 5 4; }
.d-arrow { fill: currentColor; }
svg text { font-family: var(--font-ui); font-size: 12.5px; fill: currentColor; }
svg text.t-title { font-size: 13px; font-weight: 700; }
svg text.t-sub { font-size: 11.5px; fill: var(--ink-3); }
svg text.t-label { font-size: 11.5px; fill: var(--ink-2); }
svg text.t-mono { font-family: var(--font-code); font-size: 11.5px; }

/* layered stack (lakehouse) */
.stack { margin: 1.6em 0; display: grid; gap: 6px; max-width: 640px; font-family: var(--font-ui); }
.stack > div { display: grid; grid-template-columns: 150px minmax(0, 1fr); gap: 14px; align-items: center; padding: 10px 14px; border: 1px solid var(--line-strong); border-radius: var(--radius); background: var(--surface); font-size: 0.92rem; line-height: 1.4; }
.stack b { color: var(--ink); }
.stack span { color: var(--ink-2); }
.stack .s-gov { background: var(--accent-soft); border-color: var(--accent); }
.stack .s-eng { background: var(--surface); }
.stack .s-fmt { background: var(--warn-soft); border-color: var(--warn); }
.stack .s-store { background: var(--surface-2); }

/* pager */
.pager { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; margin-top: 40px; font-family: var(--font-ui); }
.pager a, .pager div { display: block; padding: 14px 16px; border: 1px solid var(--line-strong); border-radius: var(--radius); background: var(--surface); text-decoration: none; color: var(--ink); min-width: 0; }
.pager a:hover { border-color: var(--accent); }
.pager small { display: block; color: var(--ink-3); font-size: 0.74rem; letter-spacing: 0.1em; text-transform: uppercase; font-weight: 700; margin-bottom: 4px; }
.pager .next { text-align: right; }
.pager .off { border-style: dashed; color: var(--ink-3); background: transparent; }

.sources { margin-top: 44px; padding-top: 22px; border-top: 1px solid var(--line); font: 0.92rem/1.55 var(--font-ui); color: var(--ink-2); }
.sources h2 { font-size: 0.8rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-3); margin-bottom: 10px; }
.sources ul { margin: 0; padding-left: 1.2em; }
.sources li { margin: 4px 0; }

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

@media (max-width: 1000px) {
  .shell { grid-template-columns: minmax(0, 1fr); gap: 0; padding-top: 22px; }
  .menu-btn { display: inline-block; }
  .brand .sub { display: none; }
  .course-map {
    position: fixed;
    top: calc(var(--header-h) + env(safe-area-inset-top, 0px));
    left: 0; right: 0; bottom: 0;
    max-height: none;
    z-index: 15;
    background: var(--bg);
    padding: 18px max(16px, env(safe-area-inset-right, 0px)) calc(24px + env(safe-area-inset-bottom, 0px)) max(16px, env(safe-area-inset-left, 0px));
    transform: translateX(-102%);
    visibility: hidden;
    transition: transform 0.18s ease, visibility 0s linear 0.18s;
    border-right: 1px solid var(--line);
  }
  .site.nav-open .course-map { transform: none; visibility: visible; transition: transform 0.18s ease; }
  details.topics-inline { display: block; }
  .hero .wrap { grid-template-columns: minmax(0, 1fr); gap: 32px; }
  .how { grid-template-columns: minmax(0, 1fr); gap: 18px; }
}

@media (max-width: 640px) {
  body { font-size: 16.5px; }
  .brand span { display: none; }
  .top .wrap { gap: 10px; }
  .btn-quiet .tp { display: none; }
  .cards { grid-template-columns: minmax(0, 1fr); }
  .hero { padding-top: 36px; }
  .stack > div { grid-template-columns: minmax(0, 1fr); gap: 2px; }
  .pager { grid-template-columns: minmax(0, 1fr); }
  .search kbd { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .course-map { transition: none !important; }
}

/* project path and best-practice checklist */
.path { margin: 18px 0 0; padding: 0; list-style: none; counter-reset: step; display: grid; gap: 8px; max-width: 640px; font-family: var(--font-ui); }
.path li { counter-increment: step; position: relative; padding: 10px 14px 10px 44px; border: 1px solid var(--line-strong); border-radius: var(--radius); background: var(--surface); font-size: 0.95rem; line-height: 1.4; }
.path li b { margin-right: 8px; }
.path li::before { content: counter(step); position: absolute; left: 16px; top: 10px; font-weight: 700; color: var(--accent); }
.best-section .lesson-body ul { list-style: none; padding-left: 0; }
.best-section .lesson-body li { position: relative; padding-left: 28px; }
.best-section .lesson-body li::before { content: "\2713"; position: absolute; left: 0; top: 0; color: var(--ok); font-weight: 700; }
.map-home.is-current { color: var(--accent); }