/* Guide / Learn page — plain-English how-to. Leans on ../css/protium-ui.css tokens. */

.guide { max-width: 860px; margin: 0 auto; padding: 40px 24px 72px; }

/* Hero */
.guide-hero { text-align: center; margin-bottom: 28px; }
.guide-hero h1 { font-family: var(--font-display); font-size: 34px; letter-spacing: -0.01em; margin-bottom: 10px; }
.guide-hero p { color: var(--text-muted); font-size: 15.5px; line-height: 1.6; max-width: 620px; margin: 0 auto; }

/* Reassurance strip */
.guide-note {
  display: flex; gap: 12px; align-items: flex-start;
  background: var(--ok-soft); border: 1px solid var(--ok-border); border-radius: var(--r-lg);
  padding: 14px 18px; margin-bottom: 36px; font-size: 14px; color: var(--text); line-height: 1.55;
}
.guide-note svg { flex: none; width: 20px; height: 20px; color: var(--ok); margin-top: 1px; }

/* Table of contents */
.guide-toc { margin-bottom: 40px; }
.guide-toc p { font-size: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.04em; color: var(--text-faint); margin-bottom: 10px; }
.guide-toc ol { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 8px 18px; counter-reset: toc; }
.guide-toc li { counter-increment: toc; }
.guide-toc a { display: flex; gap: 10px; align-items: baseline; font-size: 14.5px; color: var(--text); padding: 8px 12px; border: 1px solid var(--border); border-radius: var(--r-md); background: var(--surface); transition: background var(--t), border-color var(--t); }
.guide-toc a:hover { background: var(--surface-2); border-color: var(--border-strong); }
.guide-toc a::before { content: counter(toc); font-family: var(--font-mono); font-size: 12px; color: var(--accent); font-weight: 600; }
.guide-toc a small { color: var(--text-muted); font-weight: 400; }

/* Grouped table of contents */
.guide-toc .toc-cols { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.toc-group h3 { font-size: 12px; text-transform: uppercase; letter-spacing: 0.04em; color: var(--text-faint); margin-bottom: 8px; }
.toc-group ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; }
.toc-group a { font-size: 14px; color: var(--text); }
.toc-group a:hover { color: var(--accent); }

/* Category group header */
.guide-group { margin: 48px 0 4px; padding-top: 20px; border-top: 2px solid var(--border); scroll-margin-top: 80px; }
.guide-group .eyebrow { font-size: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em; color: var(--accent); }
.guide-group h2 { font-family: var(--font-display); font-size: 25px; letter-spacing: -0.01em; margin-top: 4px; }
.guide-group > p { color: var(--text-muted); font-size: 14.5px; margin-top: 6px; max-width: 640px; line-height: 1.6; }

/* "Why" callout (used for A/B theory) */
.why { background: var(--accent-soft); border: 1px solid var(--accent-ring); border-radius: var(--r-lg); padding: 20px 24px; margin-top: 14px; }
.why h3 { font-size: 16px; color: var(--accent); margin-bottom: 8px; font-family: var(--font-display); }
.why p { font-size: 14.5px; color: var(--text); line-height: 1.65; }
.why p + p { margin-top: 10px; }

/* Definition list inside a lesson card */
.deflist { margin: 0; display: grid; gap: 13px; }
.deflist dt { font-weight: 600; color: var(--text); font-size: 14.5px; }
.deflist dd { margin: 3px 0 0; color: var(--text-muted); font-size: 14px; line-height: 1.55; }

/* A tool lesson */
.lesson { margin-bottom: 40px; scroll-margin-top: 80px; }
.lesson-head { display: flex; align-items: center; gap: 12px; margin-bottom: 6px; }
.lesson-num { font-family: var(--font-mono); font-size: 13px; color: var(--accent); font-weight: 600; border: 1px solid var(--accent-ring); background: var(--accent-soft); border-radius: var(--r-sm); padding: 3px 9px; }
.lesson h2 { font-family: var(--font-display); font-size: 23px; letter-spacing: -0.01em; }
.lesson > .plain { color: var(--text); font-size: 15.5px; line-height: 1.65; margin: 8px 0 4px; }

.lesson-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-lg);
  box-shadow: var(--shadow); padding: 22px 24px; margin-top: 14px;
}
.lesson-card h3 { font-size: 12.5px; text-transform: uppercase; letter-spacing: 0.04em; color: var(--text-faint); margin-bottom: 10px; }
.lesson-card + .lesson-card { margin-top: 12px; }
.lesson p, .lesson li { font-size: 14.5px; line-height: 1.6; color: var(--text-muted); }
.lesson li { margin-bottom: 4px; }
.lesson ul { margin: 4px 0 0; padding-left: 20px; }
.lesson b { color: var(--text); }

/* Worked example: before -> after */
.eg { display: grid; grid-template-columns: 1fr auto 1fr; gap: 12px; align-items: stretch; margin-top: 10px; }
.eg-box { background: var(--field); border: 1px solid var(--border); border-radius: var(--r-md); padding: 12px 14px; min-width: 0; }
.eg-box .eg-label { font-size: 11px; text-transform: uppercase; letter-spacing: 0.04em; color: var(--text-faint); margin-bottom: 6px; }
.eg-box pre { font-family: var(--font-mono); font-size: 12.5px; color: var(--text); white-space: pre-wrap; word-break: break-word; margin: 0; line-height: 1.5; }
.eg-arrow { display: flex; align-items: center; color: var(--accent); font-size: 20px; }

.steps { counter-reset: step; list-style: none; margin: 10px 0 0; padding: 0; }
.steps li { counter-increment: step; position: relative; padding-left: 30px; margin-bottom: 8px; font-size: 14.5px; color: var(--text-muted); line-height: 1.55; }
.steps li::before { content: counter(step); position: absolute; left: 0; top: 0; width: 20px; height: 20px; border-radius: 50%; background: var(--accent); color: #fff; font-size: 11px; font-weight: 700; display: flex; align-items: center; justify-content: center; }

.kbd { font-family: var(--font-mono); font-size: 12px; background: var(--surface-2); border: 1px solid var(--border); border-radius: 4px; padding: 1px 6px; color: var(--text); }
.inline-code { font-family: var(--font-mono); font-size: 13px; background: var(--surface-2); padding: 1px 6px; border-radius: 4px; color: var(--text); }

.open-link { display: inline-flex; align-items: center; gap: 6px; margin-top: 14px; font-size: 14px; font-weight: 600; color: var(--accent); }
.open-link svg { width: 16px; height: 16px; }

/* Glossary */
.glossary { background: var(--surface-2); border: 1px solid var(--border); border-radius: var(--r-lg); padding: 24px 26px; margin-top: 8px; }
.glossary h2 { font-family: var(--font-display); font-size: 20px; margin-bottom: 16px; }
.glossary dl { margin: 0; display: grid; gap: 12px; }
.glossary dt { font-weight: 600; color: var(--text); font-size: 14.5px; }
.glossary dd { margin: 2px 0 0; color: var(--text-muted); font-size: 14px; line-height: 1.55; }

.guide-foot { text-align: center; margin-top: 40px; }
.guide-foot a { font-size: 14px; }

@media (max-width: 720px) {
  .guide-toc ol { grid-template-columns: 1fr; }
  .eg { grid-template-columns: 1fr; }
  .eg-arrow { transform: rotate(90deg); justify-content: center; }
}