/* SQLPath styles. Dark mode follows the system setting. */

:root {
  --brand: #4f46e5;
  --brand-text: #4338ca;
  --bg: #f8fafc;
  --card: #ffffff;
  --text: #1e293b;
  --heading: #0f172a;
  --muted: #64748b;
  --line: #e2e8f0;
  --soft: #f1f5f9;
  --code-bg: #0f172a;
  --code-text: #f1f5f9;
  --good: #047857;
  --good-bg: #ecfdf5;
  --bad: #be123c;
  --bad-bg: #fff1f2;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --brand: #6366f1;
    --brand-text: #a5b4fc;
    --bg: #020617;
    --card: #0f172a;
    --text: #e2e8f0;
    --heading: #ffffff;
    --muted: #94a3b8;
    --line: #1e293b;
    --soft: #1e293b;
    --code-bg: #020617;
    --good: #6ee7b7;
    --good-bg: rgba(16, 185, 129, 0.1);
    --bad: #fda4af;
    --bad-bg: rgba(244, 63, 94, 0.1);
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

a { color: var(--brand-text); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2 { color: var(--heading); line-height: 1.2; margin: 0; }
p { margin: 0 0 1rem; }

.page { max-width: 56rem; margin: 0 auto; padding-left: 1rem; padding-right: 1rem; }
.narrow { max-width: 46rem; }
.section { padding-top: 2.5rem; padding-bottom: 2.5rem; }

/* Header and footer */

#nav { background: var(--card); border-bottom: 1px solid var(--line); }
.topbar { display: flex; align-items: center; justify-content: space-between; height: 4rem; }
.logo { display: flex; align-items: center; gap: 0.5rem; font-weight: 800; font-size: 1.1rem; color: var(--heading); }
.logo:hover { text-decoration: none; }
.logo-mark {
  display: inline-flex; align-items: center; justify-content: center;
  width: 2.25rem; height: 2.25rem; border-radius: 0.6rem;
  background: var(--brand); color: #fff; font: 700 0.85rem var(--mono);
}
.logo .path { color: var(--brand-text); }
.footer { margin-top: 3rem; padding-top: 1.5rem; padding-bottom: 2rem; border-top: 1px solid var(--line); font-size: 0.85rem; color: var(--muted); }

/* Lesson list */

.page-head { margin-bottom: 1rem; }
.page-head h1 { font-size: 2.2rem; letter-spacing: -0.02em; margin-bottom: 0.75rem; }
.page-head p { color: var(--muted); max-width: 40rem; }

.module { margin-top: 2.5rem; }
.module h2 { display: flex; align-items: center; gap: 0.75rem; font-size: 1.35rem; }
.module > p { margin: 0.5rem 0 0; color: var(--muted); }
.module ol { list-style: none; padding: 0; margin: 1rem 0 0; border: 1px solid var(--line); border-radius: 0.75rem; background: var(--card); }
.module li { padding: 0.75rem 1rem; border-top: 1px solid var(--line); }
.module li:first-child { border-top: 0; }
.module li a { font-weight: 600; }
.module li span { display: block; font-size: 0.875rem; color: var(--muted); }
.num {
  flex: none; display: inline-flex; align-items: center; justify-content: center;
  width: 2rem; height: 2rem; border-radius: 0.5rem;
  background: var(--brand); color: #fff; font-size: 0.9rem; font-weight: 700;
}

/* Lesson page */

.crumbs { font-size: 0.9rem; color: var(--muted); }
#lesson h1 { margin-top: 0.5rem; font-size: 2rem; font-weight: 800; }
.summary { margin-top: 0.25rem; color: var(--muted); }
.lesson-part { margin-top: 2rem; }
.lesson-part h2 { margin-bottom: 0.6rem; font-size: 0.85rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.05em; color: var(--brand-text); }

pre.code {
  margin: 0 0 1rem; padding: 1rem; overflow-x: auto; white-space: pre-wrap;
  background: var(--code-bg); color: var(--code-text);
  border-radius: 0.75rem; font: 0.85rem/1.6 var(--mono);
}

.btn {
  padding: 0.55rem 1rem; border: 0; border-radius: 0.6rem; cursor: pointer;
  background: var(--brand); color: #fff; font: 600 0.9rem Inter, sans-serif;
}
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 0.75rem; }
table.results { width: 100%; border-collapse: collapse; font-size: 0.85rem; }
table.results th { background: var(--soft); text-align: left; padding: 0.5rem 1rem; white-space: nowrap; }
table.results td { padding: 0.45rem 1rem; white-space: nowrap; font: 0.8rem var(--mono); border-top: 1px solid var(--line); }
.null { font-style: italic; color: var(--muted); }
.empty { padding: 1rem; text-align: center; color: var(--muted); border: 1px dashed var(--line); border-radius: 0.75rem; }
.error { padding: 0.75rem 1rem; border-radius: 0.75rem; background: var(--bad-bg); color: var(--bad); font: 0.85rem var(--mono); }

.quiz-option {
  display: flex; align-items: center; gap: 0.75rem; width: 100%; margin-top: 0.5rem;
  padding: 0.6rem 1rem; border: 1px solid var(--line); border-radius: 0.6rem;
  background: var(--card); color: var(--text); font: 0.9rem Inter, sans-serif; text-align: left; cursor: pointer;
}
.quiz-option:hover { border-color: var(--brand); }
.quiz-option.right { border-color: var(--good); background: var(--good-bg); }
.quiz-option.wrong { border-color: var(--bad); background: var(--bad-bg); }
.letter { flex: none; width: 1.5rem; height: 1.5rem; border: 1px solid var(--muted); border-radius: 50%; display: inline-flex; align-items: center; justify-content: center; font-size: 0.75rem; color: var(--muted); }
#quiz-result p { margin-top: 1rem; padding: 0.75rem 1rem; border-radius: 0.6rem; font-size: 0.9rem; }
#quiz-result .good { background: var(--good-bg); color: var(--good); }
#quiz-result .bad { background: var(--bad-bg); color: var(--bad); }

.prev-next { display: flex; justify-content: space-between; gap: 1rem; margin-top: 2.5rem; padding-top: 1.5rem; border-top: 1px solid var(--line); font-weight: 600; }