/* Shared stylesheet for go-lessons. Extracted from lessons 0001–0005 (previously inlined).
   Link with: <link rel="stylesheet" href="./assets/lesson.css">  */

:root {
  --bg: #0f1117; --surface: #1a1d27; --border: #2a2d3a;
  --accent: #6c8ef7; --accent2: #f7a86c; --accent3: #6cf7b8;
  --text: #d4d8f0; --muted: #7a7f99; --code-bg: #111520;
  --danger: #f76c6c; --warn: #f7d96c;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  background: var(--bg); color: var(--text);
  font-family: 'Georgia', serif; font-size: 16px; line-height: 1.75;
  max-width: 900px; margin: 0 auto; padding: 3rem 2rem 6rem;
}
h1 { font-size: 1.85rem; color: #fff; margin-bottom: 0.3rem; font-weight: 700; }
.subtitle { color: var(--muted); font-size: 0.9rem; margin-bottom: 2.5rem; }
h2 {
  font-size: 1.05rem; color: var(--accent);
  margin: 2.6rem 0 1rem; text-transform: uppercase;
  letter-spacing: 0.06em; font-family: 'Courier New', monospace;
}
h3 { font-size: 0.95rem; color: var(--accent2); margin: 1.5rem 0 0.5rem; }
p { margin-bottom: 1rem; }
a { color: var(--accent); }
code {
  font-family: 'Courier New', monospace; font-size: 0.85em;
  background: var(--code-bg); border: 1px solid var(--border);
  border-radius: 3px; padding: 0.1em 0.35em; color: var(--accent3);
}
pre {
  background: var(--code-bg); border: 1px solid var(--border);
  border-radius: 6px; padding: 1rem 1.2rem; overflow-x: auto;
  margin: 1rem 0; font-family: 'Courier New', monospace;
  font-size: 0.8rem; line-height: 1.6; color: var(--text);
}
pre code { background: none; border: none; padding: 0; color: inherit; font-size: 1em; }
pre .c { color: var(--muted); }
pre .h { background: rgba(108,247,184,0.12); border-left: 3px solid var(--accent3); padding-left: 0.4em; margin-left: -0.4em; display: block; }
pre .bad { background: rgba(247,108,108,0.1); border-left: 3px solid var(--danger); padding-left: 0.4em; margin-left: -0.4em; display: block; }
pre .ok { color: var(--accent3); }
pre .warn { color: var(--warn); }

.callout {
  border-left: 3px solid var(--accent); background: rgba(108,142,247,0.07);
  border-radius: 0 6px 6px 0; padding: 0.9rem 1.1rem; margin: 1.2rem 0;
}
.callout.warn { border-color: var(--warn); background: rgba(247,217,108,0.07); }
.callout.success { border-color: var(--accent3); background: rgba(108,247,184,0.07); }
.callout.evidence { border-color: var(--muted); background: rgba(122,127,153,0.08); font-size: 0.9rem; }
.callout strong { color: #fff; }

table { width: 100%; border-collapse: collapse; margin: 1.3rem 0; font-size: 0.85rem; }
th {
  background: var(--surface); color: var(--accent);
  font-family: 'Courier New', monospace; font-size: 0.75rem;
  text-transform: uppercase; letter-spacing: 0.05em;
  padding: 0.55rem 0.9rem; text-align: left; border: 1px solid var(--border);
}
td { padding: 0.55rem 0.9rem; border: 1px solid var(--border); vertical-align: top; font-size: 0.87rem; }
tr:nth-child(even) td { background: rgba(255,255,255,0.02); }
.s-wrong { color: var(--danger); font-weight: bold; }
.s-partial { color: var(--warn); font-weight: bold; }
.s-confirmed { color: var(--accent3); font-weight: bold; }

blockquote {
  border-left: 3px solid var(--muted); margin: 1rem 0; padding: 0.3rem 0 0.3rem 1rem;
  color: var(--muted); font-style: italic;
}

footer {
  margin-top: 4rem; padding-top: 2rem;
  border-top: 1px solid var(--border); color: var(--muted); font-size: 0.85rem;
}
footer a { color: var(--accent); text-decoration: none; }
.nav { display: flex; gap: 1.5rem; margin-top: 0.8rem; flex-wrap: wrap; }

/* --- Quiz widget (retrieval practice). Used by predict-the-allocation lessons. --- */
.quiz {
  border: 1px solid var(--border); border-radius: 8px; background: var(--surface);
  padding: 1.2rem 1.3rem; margin: 1.6rem 0;
}
.quiz .q-num {
  font-family: 'Courier New', monospace; font-size: 0.72rem; letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--muted); margin-bottom: 0.6rem;
}
.quiz pre { margin: 0.4rem 0 0.9rem; }
.quiz .choices { display: flex; gap: 0.7rem; flex-wrap: wrap; }
.quiz button.choice {
  font-family: 'Courier New', monospace; font-size: 0.85rem; cursor: pointer;
  background: var(--code-bg); color: var(--text); border: 1px solid var(--border);
  border-radius: 5px; padding: 0.5rem 1.1rem; transition: all 0.12s;
}
.quiz button.choice:hover { border-color: var(--accent); color: #fff; }
.quiz button.choice.correct { background: rgba(108,247,184,0.15); border-color: var(--accent3); color: var(--accent3); }
.quiz button.choice.wrong { background: rgba(247,108,108,0.13); border-color: var(--danger); color: var(--danger); }
.quiz button.choice:disabled { cursor: default; opacity: 0.85; }
.quiz .reveal {
  display: none; margin-top: 1rem; padding-top: 0.9rem; border-top: 1px dashed var(--border);
  font-size: 0.9rem;
}
.quiz .reveal.show { display: block; }
.quiz .verdict-line { font-family: 'Courier New', monospace; font-weight: bold; margin-bottom: 0.6rem; }
.quiz .verdict-line.stack { color: var(--accent3); }
.quiz .verdict-line.heap { color: var(--warn); }