/* ============================================================
   Spring Boot Course — shared lesson stylesheet
   Tufte-inspired: quiet typography, generous margins, prints well.
   Linked by every lesson and reference doc for a consistent look.
   ============================================================ */

:root {
  --ink:        #1a1a1a;
  --ink-soft:   #44464b;
  --muted:      #6b6e76;
  --rule:       #e2e2dd;
  --bg:         #fdfdfb;
  --paper:      #ffffff;
  /* Spring's signature green, used sparingly as the accent */
  --spring:     #6db33f;
  --spring-dk:  #4a8a2a;
  --accent-bg:  #f1f7ec;
  --code-bg:    #f6f6f4;
  --code-ink:   #2b2b2b;
  --warn-bg:    #fdf6e3;
  --warn-ink:   #8a6d1a;
  --maxw:       46rem;
}

* { box-sizing: border-box; }

html { font-size: 18px; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: ui-serif, Georgia, "Iowan Old Style", "Palatino Linotype", serif;
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 4rem 1.5rem 6rem;
}

/* ---- Course chrome ---------------------------------------- */
.eyebrow {
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--spring-dk);
  font-weight: 600;
  margin: 0 0 0.6rem;
}

h1 {
  font-size: 2.1rem;
  line-height: 1.15;
  margin: 0 0 0.4rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.dek {
  font-size: 1.12rem;
  color: var(--ink-soft);
  font-style: italic;
  margin: 0 0 2rem;
}

h2 {
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  font-size: 1.0rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--spring-dk);
  margin: 2.8rem 0 0.4rem;
  padding-bottom: 0.3rem;
  border-bottom: 1px solid var(--rule);
}

h3 {
  font-size: 1.18rem;
  margin: 1.8rem 0 0.3rem;
  font-weight: 600;
}

p { margin: 0.7rem 0; }

a { color: var(--spring-dk); text-decoration: none; border-bottom: 1px solid rgba(74,138,42,0.35); }
a:hover { border-bottom-color: var(--spring-dk); }

strong { font-weight: 600; }

ul, ol { padding-left: 1.3rem; }
li { margin: 0.35rem 0; }

/* ---- Code ------------------------------------------------- */
code {
  font-family: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
  font-size: 0.84em;
  background: var(--code-bg);
  color: var(--code-ink);
  padding: 0.12em 0.36em;
  border-radius: 4px;
}

pre {
  background: var(--code-bg);
  border: 1px solid var(--rule);
  border-left: 3px solid var(--spring);
  border-radius: 6px;
  padding: 1rem 1.15rem;
  overflow-x: auto;
  font-size: 0.82rem;
  line-height: 1.5;
}
pre code { background: none; padding: 0; font-size: inherit; }

/* Copy-to-clipboard button (added by assets/copy-code.js) */
.code-block { position: relative; }
.code-block .copy-btn {
  position: absolute;
  top: 0.45rem;
  right: 0.45rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.85rem;
  height: 1.85rem;
  padding: 0;
  border: 1px solid var(--rule);
  border-radius: 5px;
  background: var(--paper);
  color: var(--muted);
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}
.code-block:hover .copy-btn,
.code-block .copy-btn:focus-visible { opacity: 1; }
.code-block .copy-btn:hover { color: var(--spring-dk); border-color: var(--spring); }
.code-block .copy-btn.copied { color: var(--spring-dk); border-color: var(--spring); opacity: 1; }
@media (hover: none) { .code-block .copy-btn { opacity: 1; } }

.filename {
  font-family: ui-monospace, Menlo, monospace;
  font-size: 0.72rem;
  color: var(--muted);
  text-transform: none;
  letter-spacing: 0;
  margin: 1.2rem 0 -0.5rem;
}

/* ---- Callouts --------------------------------------------- */
.callout {
  background: var(--accent-bg);
  border-radius: 8px;
  padding: 1rem 1.2rem;
  margin: 1.4rem 0;
  font-size: 0.96rem;
}
.callout.warn { background: var(--warn-bg); }
.callout .label {
  font-family: ui-sans-serif, system-ui, sans-serif;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--spring-dk);
  display: block;
  margin-bottom: 0.3rem;
}
.callout.warn .label { color: var(--warn-ink); }

/* Troubleshooting list inside a callout — one item per line */
.callout .qa-list { list-style: none; padding-left: 0; margin: 0.5rem 0 0; }
.callout .qa-list li { margin: 0.7rem 0; padding-left: 1.1rem; text-indent: -1.1rem; }
.callout .qa-list li::before { content: "›"; color: var(--spring-dk); font-weight: 700; margin-right: 0.5rem; }
.callout.warn .qa-list li::before { color: var(--warn-ink); }
.callout .qa-list strong { color: inherit; }

/* Margin note, Tufte style */
.note {
  font-size: 0.86rem;
  color: var(--muted);
  font-style: italic;
}

/* ---- Key term / definition -------------------------------- */
.term {
  font-family: ui-sans-serif, system-ui, sans-serif;
  font-weight: 600;
  color: var(--spring-dk);
  font-style: normal;
}

/* ---- "Win" banner ----------------------------------------- */
.win {
  border: 1px solid var(--spring);
  background: var(--accent-bg);
  border-radius: 8px;
  padding: 1.1rem 1.3rem;
  margin: 2rem 0;
}
.win .label { color: var(--spring-dk); }

/* ---- Quiz widget (paired with assets/quiz.js) ------------- */
.quiz {
  border: 1px solid var(--rule);
  border-radius: 8px;
  padding: 1.2rem 1.3rem;
  margin: 1.4rem 0;
  background: var(--paper);
}
.quiz .q {
  font-weight: 600;
  margin-bottom: 0.8rem;
  font-family: ui-sans-serif, system-ui, sans-serif;
  font-size: 0.98rem;
}
.quiz .opt {
  display: block;
  width: 100%;
  text-align: left;
  font: inherit;
  font-size: 0.92rem;
  background: var(--paper);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 0.6rem 0.85rem;
  margin: 0.4rem 0;
  cursor: pointer;
  transition: background 0.12s, border-color 0.12s;
}
.quiz .opt:hover { border-color: var(--spring); background: var(--accent-bg); }
.quiz .opt.correct { border-color: var(--spring); background: var(--accent-bg); }
.quiz .opt.wrong   { border-color: #d98b8b; background: #fbeded; }
.quiz .opt:disabled { cursor: default; }
.quiz .feedback {
  font-size: 0.9rem;
  margin-top: 0.7rem;
  min-height: 1.2em;
  font-family: ui-sans-serif, system-ui, sans-serif;
}
.quiz .feedback.ok  { color: var(--spring-dk); }
.quiz .feedback.no  { color: #b4504f; }

/* ---- Footer / nav ----------------------------------------- */
.lesson-footer {
  margin-top: 3.5rem;
  padding-top: 1.2rem;
  border-top: 2px solid var(--rule);
  font-size: 0.92rem;
  color: var(--muted);
}
.nav-links { display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }

/* ---- Print ------------------------------------------------ */
@media print {
  html { font-size: 12pt; }
  body { background: white; }
  .wrap { padding: 0; max-width: 100%; }
  pre, .quiz, .callout, .win { break-inside: avoid; }
  a { color: var(--ink); border: none; }
  .quiz .opt { break-inside: avoid; }
  .copy-btn { display: none; }
}