/* ══════════════════════════════════════════════════════════════════
   Spring Boot by Building — shared chapter styles
   Almanac design system (see /design.md) + workshop pedagogy components.
   Java ochre accent. Linked by every chapter in this course.
   ══════════════════════════════════════════════════════════════════ */

:root {
  --paper: oklch(96.5% 0.015 85);
  --paper-2: oklch(93.8% 0.019 82);
  --card: oklch(98.4% 0.010 88);
  --ink: oklch(27% 0.022 55);
  --ink-soft: oklch(43% 0.024 52);
  --ink-faint: oklch(57% 0.022 58);
  --hairline: oklch(86% 0.018 78);
  --slab: oklch(26% 0.020 55);
  --slab-line: oklch(19% 0.016 52);
  --accent: oklch(58% 0.13 75); /* java ochre */
  --accent-tint: color-mix(in oklch, var(--accent) 12%, var(--paper));
  --accent-line: color-mix(in oklch, var(--accent) 55%, var(--hairline));
  --warn: oklch(52% 0.14 40); /* pitfall — rust-red */
  --warn-tint: color-mix(in oklch, var(--warn) 12%, var(--paper));
  --ok: oklch(52% 0.11 150); /* success / you-do green */
  --ok-tint: color-mix(in oklch, var(--ok) 12%, var(--paper));
  --ok-line: color-mix(in oklch, var(--ok) 55%, var(--hairline));
  --slab-ink: oklch(88% 0.010 85);
  --slab-faint: oklch(66% 0.012 80);
  --radius: 8px;
  --radius-sm: 5px;
  --maxw: 800px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --font-display: 'Fraunces', ui-serif, Georgia, serif;
  --font-body: 'Newsreader', ui-serif, Georgia, serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, SFMono-Regular, monospace;
}

html[data-theme="dark"] {
  --paper: oklch(22% 0.014 62);
  --paper-2: oklch(19% 0.013 60);
  --card: oklch(26% 0.015 62);
  --ink: oklch(91% 0.014 85);
  --ink-soft: oklch(74% 0.016 78);
  --ink-faint: oklch(60% 0.016 72);
  --hairline: oklch(35% 0.015 60);
  --slab: oklch(17% 0.012 55);
  --slab-line: oklch(13% 0.010 52);
  --accent: oklch(74% 0.14 78);
  --accent-tint: color-mix(in oklch, var(--accent) 16%, var(--paper));
  --accent-line: color-mix(in oklch, var(--accent) 50%, var(--hairline));
  --warn: oklch(70% 0.14 42);
  --warn-tint: color-mix(in oklch, var(--warn) 16%, var(--paper));
  --ok: oklch(72% 0.13 150);
  --ok-tint: color-mix(in oklch, var(--ok) 16%, var(--paper));
  --ok-line: color-mix(in oklch, var(--ok) 50%, var(--hairline));
  --slab-ink: oklch(88% 0.010 85);
  --slab-faint: oklch(66% 0.012 80);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --paper: oklch(22% 0.014 62);
    --paper-2: oklch(19% 0.013 60);
    --card: oklch(26% 0.015 62);
    --ink: oklch(91% 0.014 85);
    --ink-soft: oklch(74% 0.016 78);
    --ink-faint: oklch(60% 0.016 72);
    --hairline: oklch(35% 0.015 60);
    --slab: oklch(17% 0.012 55);
    --slab-line: oklch(13% 0.010 52);
    --accent: oklch(74% 0.14 78);
    --accent-tint: color-mix(in oklch, var(--accent) 16%, var(--paper));
    --accent-line: color-mix(in oklch, var(--accent) 50%, var(--hairline));
    --warn: oklch(70% 0.14 42);
    --warn-tint: color-mix(in oklch, var(--warn) 16%, var(--paper));
    --ok: oklch(72% 0.13 150);
    --ok-tint: color-mix(in oklch, var(--ok) 16%, var(--paper));
    --ok-line: color-mix(in oklch, var(--ok) 50%, var(--hairline));
  }
}

* { box-sizing: border-box; }
html, body { overflow-x: clip; }
html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-optical-sizing: auto;
  font-size: 1.02rem;
  line-height: 1.72;
  padding: 0 20px 96px;
}

.wrap { max-width: var(--maxw); margin: 0 auto; }

/* ── Theme toggle ─────────────────────────────── */
.toggle {
  position: fixed; top: 14px; right: 14px; z-index: 50;
  font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.02em;
  background: var(--card); color: var(--ink-soft);
  border: 1px solid var(--hairline); border-radius: 999px;
  padding: 6px 12px; cursor: pointer;
  transition: color .25s var(--ease), border-color .25s var(--ease), background .25s var(--ease);
}
.toggle:hover { color: var(--accent); border-color: var(--accent-line); }

/* ── Typography ───────────────────────────────── */
h1, h2, h3, h4 {
  font-family: var(--font-display); font-style: normal; font-weight: 600;
  letter-spacing: -0.018em; line-height: 1.15; color: var(--ink);
  overflow-wrap: anywhere;
}
h1 { font-size: clamp(2rem, 6vw, 3rem); margin: 0 0 .35em; }
h2 { font-size: clamp(1.5rem, 4vw, 2rem); margin: 2.4em 0 .5em; letter-spacing: -0.02em; }
h3 { font-size: 1.28rem; margin: 2em 0 .4em; }
h4 { font-size: 1.06rem; margin: 1.6em 0 .3em; }
p { margin: 0 0 1.05em; }
a { color: var(--accent); text-decoration: none; border-bottom: 1px solid var(--accent-line); }
a:hover { border-bottom-color: var(--accent); }
em { font-style: italic; }
strong { font-weight: 600; color: var(--ink); }

code:not([class*="language-"]) {
  font-family: var(--font-mono); font-size: 0.86em;
  background: var(--accent-tint); color: var(--ink);
  padding: 0.08em 0.36em; border-radius: 4px; overflow-wrap: anywhere;
}
.accent { color: var(--accent); }

.num {
  font-family: var(--font-mono); font-size: 0.72rem; color: var(--ink-faint);
  letter-spacing: 0.04em; font-weight: 500; display: block; margin-bottom: 0.2em;
}
h2 .num, h3 .num { margin-bottom: 0.25em; }

/* ── Masthead ─────────────────────────────────── */
.masthead { padding-top: 68px; }
.eyebrow {
  font-family: var(--font-mono); font-size: 0.74rem; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--accent); margin: 0 0 1em;
}
.lede { font-size: 1.12rem; color: var(--ink-soft); margin-bottom: 1em; max-width: 62ch; }
.meta { font-family: var(--font-mono); font-size: 0.75rem; color: var(--ink-faint); letter-spacing: 0.03em; margin: 0; }
.rule-2 {
  border: 0; border-top: 1px solid var(--hairline);
  box-shadow: 0 3px 0 -2px var(--hairline); margin: 1.8em 0 0; height: 3px;
}
hr.rule { border: 0; border-top: 1px solid var(--hairline); margin: 2.8em 0; }

/* ── Crux ─────────────────────────────────────── */
.crux {
  background: var(--accent-tint); border: 1px solid var(--accent-line);
  border-radius: var(--radius); padding: 20px 22px; margin: 2.2em 0;
}
.crux .tag, .callout .tag {
  font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.03em;
  color: var(--ink-faint); display: block; margin-bottom: 0.5em;
}
.crux p { margin: 0; font-size: 1.08rem; }
.crux p:last-child { margin: 0; }

/* ── Callouts ─────────────────────────────────── */
.callout {
  border-left: 3px solid var(--accent); background: var(--accent-tint);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0; padding: 14px 18px; margin: 1.6em 0;
}
.callout p { margin: 0 0 .6em; }
.callout p:last-child { margin: 0; }
.callout .tag {
  font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.03em;
  color: var(--ink-soft); display: block; margin-bottom: 0.45em; font-weight: 500;
}
.callout.pitfall { border-left-color: var(--warn); background: var(--warn-tint); }
.callout.pitfall .tag { color: var(--warn); }
.callout.analogy { border-left-color: var(--ink-faint); background: transparent; }
.callout.analogy .tag { color: var(--ink-faint); }
.callout.why { border-left-color: var(--accent); background: transparent; }

/* ── Cards & grids ────────────────────────────── */
.grid { display: grid; gap: 14px; margin: 1.6em 0; }
.grid.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid.three { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.card {
  border: 1px solid var(--hairline); border-radius: var(--radius);
  padding: 15px 17px; background: var(--card); min-width: 0;
}
.card h4 { margin: 0 0 .3em; font-size: 1rem; }
.card p { margin: 0; font-size: 0.95rem; color: var(--ink-soft); }
.card .k {
  font-family: var(--font-mono); font-size: 0.78rem; color: var(--accent);
  display: block; margin-bottom: 0.35em;
}

/* ── VS ───────────────────────────────────────── */
.vs {
  display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0;
  border: 1px solid var(--hairline); border-radius: var(--radius);
  overflow: hidden; margin: 1.6em 0;
}
.vs > div { padding: 16px 18px; min-width: 0; }
.vs > div:first-child { border-right: 1px solid var(--hairline); }
.vs h4 { margin: 0 0 .5em; font-size: 1rem; }
.vs ul { margin: 0; padding-left: 1.1em; }
.vs li { font-size: 0.93rem; color: var(--ink-soft); margin-bottom: .3em; }

/* ── Flow chips ───────────────────────────────── */
.flow {
  display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin: 1.6em 0;
  font-family: var(--font-mono); font-size: 0.8rem;
}
.flow .chip {
  border: 1px solid var(--hairline); border-radius: 999px; padding: 6px 13px;
  background: var(--card); color: var(--ink); white-space: nowrap;
}
.flow .chip.on { border-color: var(--accent-line); background: var(--accent-tint); color: var(--ink); }
.flow .arw { color: var(--ink-faint); }

/* ── Figures ──────────────────────────────────── */
figure { margin: 1.8em 0; }
.figbox { overflow-x: auto; }
figure svg { width: 100%; height: auto; display: block; }
.cap {
  font-family: var(--font-mono); font-size: 0.72rem; color: var(--ink-faint);
  margin-top: 0.7em; text-align: center; letter-spacing: 0.02em;
}
text { font-family: var(--font-mono); }

/* ── Code ─────────────────────────────────────── */
.codewrap { margin: 1.6em 0; border-radius: var(--radius); overflow: hidden; }
.codebar { background: var(--slab-line); padding: 8px 16px; display: flex; justify-content: space-between; gap: 10px; }
.codebar .fn { font-family: var(--font-mono); font-size: 0.74rem; color: var(--slab-faint); letter-spacing: 0.02em; }
.codebar .fn.new { color: color-mix(in oklch, var(--ok) 70%, white); }
.codewrap pre[class*="language-"], .codewrap pre:not([class]) {
  background: var(--slab); border: 1px solid var(--slab-line);
  border-radius: 0 0 var(--radius) var(--radius); margin: 0; padding: 18px 20px;
  font-family: var(--font-mono); font-size: 0.86rem; line-height: 1.7;
  overflow: auto; color: var(--slab-ink);
}
.codewrap pre code[class*="language-"], .codewrap pre code {
  background: none; border: 0; padding: 0; font-size: inherit; text-shadow: none;
  font-family: var(--font-mono); color: var(--slab-ink);
}
.codewrap:has(.codebar) pre { border-top: 0; }

/* ── Tables ───────────────────────────────────── */
.tablewrap { overflow-x: auto; margin: 1.6em 0; }
table { border-collapse: collapse; width: 100%; font-size: 0.92rem; }
th, td { text-align: left; padding: 9px 13px; border-bottom: 1px solid var(--hairline); vertical-align: top; }
th {
  font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.03em;
  text-transform: uppercase; color: var(--ink-faint); font-weight: 500;
  border-bottom: 1px solid var(--ink-faint);
}
td { color: var(--ink-soft); }
td strong { color: var(--ink); }

/* ── Details / Q&A ────────────────────────────── */
details { border-bottom: 1px solid var(--hairline); padding: 4px 0; }
details:first-of-type { border-top: 1px solid var(--hairline); }
summary {
  cursor: pointer; padding: 12px 28px 12px 4px; font-weight: 500; color: var(--ink);
  list-style: none; position: relative; font-size: 1.02rem; transition: color .2s var(--ease);
}
summary:hover { color: var(--accent); }
summary::-webkit-details-marker { display: none; }
summary::after {
  content: "+"; position: absolute; right: 6px; top: 11px;
  font-family: var(--font-mono); color: var(--ink-faint); transition: transform .25s var(--ease);
}
details[open] summary::after { content: "\2212"; color: var(--accent); }
details .ans { padding: 0 4px 14px; color: var(--ink-soft); font-size: 0.97rem; }
details .ans p { margin: 0 0 .7em; }
details .ans p:last-child { margin: 0; }

/* ── Notebook summary panel ───────────────────── */
.notebook {
  background: var(--paper-2); border: 1px solid var(--hairline);
  border-radius: var(--radius); padding: 6px 26px 26px; margin: 2.2em 0;
}
.notebook h2 { margin-top: 1.1em; font-size: 1.5rem; }
.notebook h3 { font-size: 1.05rem; margin: 1.5em 0 .3em; }
.notebook ul { margin: 0.3em 0 0.9em; padding-left: 1.15em; list-style: none; }
.notebook li {
  position: relative; font-size: 0.93rem; line-height: 1.62; color: var(--ink);
  margin-bottom: 0.3em; padding-left: 0.2em;
}
.notebook li::before { content: "\2013"; position: absolute; left: -0.95em; color: var(--ink-faint); }
.notebook li ul { margin: 0.2em 0 0.4em; }
.notebook li li::before { content: "\00B7"; }
.nb-k { font-family: var(--font-mono); font-size: 0.82rem; font-weight: 500; color: var(--ink); }
.nb-aid { display: block; font-style: italic; color: var(--ink-faint); font-size: 0.86rem; }
.nb-note ul li::before { content: none; }
.nb-note li { padding-left: 0; }
.nb-note .m { font-family: var(--font-mono); font-weight: 600; margin-right: .4em; }

/* ── Pill row ─────────────────────────────────── */
.pill-row { display: flex; flex-wrap: wrap; gap: 8px; margin: 1.6em 0; }
.pill-row .pill {
  font-family: var(--font-mono); font-size: 0.74rem; border: 1px solid var(--hairline);
  border-radius: 999px; padding: 5px 12px; color: var(--ink-soft); background: var(--card);
}

.lead { font-size: 1.08rem; }
ul.body, ol.body { margin: 0 0 1.05em; padding-left: 1.3em; }
ul.body li, ol.body li { margin-bottom: 0.4em; }
.keydef { font-weight: 600; color: var(--ink); }
.flag { color: var(--warn); font-family: var(--font-mono); font-weight: 600; font-size: 0.85em; }
.add { color: var(--accent); font-family: var(--font-mono); font-weight: 600; font-size: 0.85em; }

.takeaways { counter-reset: t; list-style: none; padding: 0; margin: 1.4em 0; }
.takeaways li { position: relative; padding-left: 2.4em; margin-bottom: 0.9em; }
.takeaways li::before {
  counter-increment: t; content: counter(t); position: absolute; left: 0; top: 0.05em;
  font-family: var(--font-mono); font-size: 0.78rem; color: var(--accent);
  border: 1px solid var(--accent-line); border-radius: 50%; width: 1.7em; height: 1.7em;
  display: grid; place-items: center;
}

/* ══════════════════════════════════════════════════════════════════
   WORKSHOP PEDAGOGY COMPONENTS (new to this course)
   ══════════════════════════════════════════════════════════════════ */

/* Phase badge — signals how much scaffolding a block gives you */
.badge {
  display: inline-block; font-family: var(--font-mono); font-size: 0.66rem;
  letter-spacing: 0.08em; text-transform: uppercase; font-weight: 600;
  padding: 3px 9px; border-radius: 999px; border: 1px solid var(--hairline);
  color: var(--ink-faint); vertical-align: middle;
}
.badge.we  { color: var(--accent); border-color: var(--accent-line); background: var(--accent-tint); }
.badge.you { color: var(--ok); border-color: var(--ok-line); background: var(--ok-tint); }
.badge.hint{ color: var(--warn); border-color: color-mix(in oklch, var(--warn) 45%, var(--hairline)); }

/* Steps — numbered end-to-end procedure with a mono index chip */
.steps { counter-reset: s; list-style: none; padding: 0; margin: 1.5em 0; }
.steps > li {
  position: relative; padding-left: 3em; margin-bottom: 1.1em;
  border-left: 1px solid var(--hairline); padding-bottom: .3em;
}
.steps > li:last-child { border-left-color: transparent; }
.steps > li::before {
  counter-increment: s; content: counter(s);
  position: absolute; left: -0.9em; top: -0.15em;
  font-family: var(--font-mono); font-size: 0.76rem; color: var(--paper);
  background: var(--accent); border-radius: 50%; width: 1.8em; height: 1.8em;
  display: grid; place-items: center; font-weight: 600;
}
.steps > li > .st-t { font-weight: 600; color: var(--ink); display: block; margin-bottom: .2em; }
.steps > li p { margin: .3em 0; }

/* File-tree block */
.tree {
  font-family: var(--font-mono); font-size: 0.8rem; line-height: 1.65;
  background: var(--paper-2); border: 1px solid var(--hairline);
  border-radius: var(--radius); padding: 16px 18px; margin: 1.6em 0;
  color: var(--ink-soft); overflow-x: auto; white-space: pre;
}
.tree b { color: var(--ink); font-weight: 600; }
.tree .c { color: var(--ink-faint); } /* inline comment */
.tree .hl { color: var(--accent); font-weight: 600; } /* the file we touch now */

/* Exercise card — the spine of the practice + build chapters */
.exercise {
  border: 1px solid var(--hairline); border-left: 3px solid var(--ok);
  border-radius: var(--radius); background: var(--card);
  padding: 18px 20px; margin: 1.8em 0;
}
.exercise > .ex-head {
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: .6em;
}
.exercise .ex-no {
  font-family: var(--font-mono); font-size: 0.74rem; letter-spacing: 0.04em;
  color: var(--ink-faint); font-weight: 500;
}
.exercise h4 { margin: 0; font-size: 1.1rem; }
.exercise p { margin: 0 0 .7em; }
.exercise p:last-child { margin: 0; }
.exercise .goal { color: var(--ink); }

/* Acceptance-criteria / definition-of-done checklist */
.checks { list-style: none; padding: 0; margin: 1em 0; }
.checks li {
  position: relative; padding-left: 1.9em; margin-bottom: .5em;
  font-size: 0.96rem; color: var(--ink-soft);
}
.checks li::before {
  content: ""; position: absolute; left: 0; top: 0.28em;
  width: 1.05em; height: 1.05em; border: 1.5px solid var(--ok-line); border-radius: 4px;
}
.checks li strong { color: var(--ink); }

/* Task breakdown — the build-from-scratch ordered spec */
.tasklist { list-style: none; counter-reset: tk; padding: 0; margin: 1.2em 0; }
.tasklist li {
  position: relative; padding-left: 2.6em; margin-bottom: .75em; font-size: 0.97rem;
}
.tasklist li::before {
  counter-increment: tk; content: "T" counter(tk);
  position: absolute; left: 0; top: 0.05em; font-family: var(--font-mono);
  font-size: 0.68rem; font-weight: 600; color: var(--ink-faint);
  border: 1px solid var(--hairline); border-radius: 4px; padding: 2px 5px; background: var(--paper-2);
}

/* Hint stack — progressive reveal, warm marker */
details.hint { border: 0; border-top: 1px dashed var(--hairline); padding: 2px 0; }
details.hint:first-of-type { border-top: 1px dashed var(--hairline); }
details.hint summary { font-family: var(--font-mono); font-size: 0.82rem; color: var(--warn); font-weight: 500; padding: 9px 28px 9px 4px; }
details.hint summary:hover { color: var(--warn); opacity: .8; }
details.hint[open] summary::after { color: var(--warn); }
details.hint .ans { font-size: 0.95rem; padding-top: .2em; }

/* Solution reveal — accent, sits apart from plain Q&A */
details.solution { border: 1px solid var(--accent-line); border-radius: var(--radius); background: var(--accent-tint); padding: 2px 16px; margin: 1.2em 0; }
details.solution:first-of-type { border-top: 1px solid var(--accent-line); }
details.solution summary { color: var(--accent); font-weight: 600; }
details.solution summary::after { color: var(--accent); }
details.solution .ans { padding-bottom: 8px; }
details.solution .codewrap { margin: 1em 0; }

/* Self-check line */
.selfcheck {
  font-family: var(--font-mono); font-size: 0.8rem; color: var(--ink-faint);
  border-top: 1px dotted var(--hairline); margin-top: .9em; padding-top: .7em;
}
.selfcheck b { color: var(--ink-soft); font-weight: 600; }

/* "Why this file" annotation strip under code */
.annot {
  font-size: 0.9rem; color: var(--ink-soft); background: var(--paper-2);
  border: 1px solid var(--hairline); border-top: 0;
  border-radius: 0 0 var(--radius) var(--radius); padding: 12px 16px;
  margin: -1.6em 0 1.6em; /* hug the code block above */
}
.annot .k { font-family: var(--font-mono); font-size: 0.72rem; color: var(--accent); display: block; margin-bottom: .35em; letter-spacing: .02em; }
.annot ul { margin: 0; padding-left: 1.2em; }
.annot li { margin-bottom: .3em; }
.annot code { font-size: 0.82em; }

/* Terminal transcript block */
.term {
  font-family: var(--font-mono); font-size: 0.82rem; line-height: 1.65;
  background: var(--slab); color: var(--slab-ink); border: 1px solid var(--slab-line);
  border-radius: var(--radius); padding: 16px 18px; margin: 1.6em 0; overflow-x: auto; white-space: pre;
}
.term .p { color: var(--slab-faint); } /* prompt */
.term .o { color: color-mix(in oklch, var(--ok) 65%, white); } /* good output */

@media (max-width: 640px) {
  body { padding: 0 15px 96px; }
  .grid.two, .grid.three { grid-template-columns: minmax(0, 1fr); }
  .vs { grid-template-columns: minmax(0, 1fr); }
  .vs > div:first-child { border-right: 0; border-bottom: 1px solid var(--hairline); }
  .notebook { padding: 6px 16px 20px; }
}

@media (prefers-reduced-motion: reduce) { * { transition-duration: 0.001ms !important; } }

@media print {
  .toggle { display: none; }
  body { padding: 0; }
  .callout, .crux, .card, .notebook, .exercise, .steps > li, figure { break-inside: avoid; }
  details { break-inside: avoid; }
}