/* ============================================================
   BASE — reset, typography, layout primitives, prose
   ============================================================ */

*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  color: var(--c-ink);
  background: var(--c-page);
  font-weight: 350;
  letter-spacing: 0.005em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

img, picture, svg { max-width: 100%; display: block; }

a { color: inherit; text-decoration: none; }

::selection { background: var(--c-olive); color: var(--c-page); }

:focus-visible {
  outline: 2px solid var(--c-olive-deep);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ---- Headings ---- */
h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-weight: 500;
  line-height: var(--lh-tight);
  letter-spacing: var(--ls-head);
  color: var(--c-ink);
  text-wrap: balance;
}
h1 { font-size: var(--fs-h1); font-weight: 500; }
h2 { font-size: var(--fs-h2); }
h3 { font-size: var(--fs-h3); }
h4 { font-size: var(--fs-h4); }

h5 {
  font-family: var(--font-sans);
  font-size: var(--fs-h5);
  font-weight: 500;
  line-height: var(--lh-snug);
}
h6 {
  font-family: var(--font-sans);
  font-size: var(--fs-h6);
  font-weight: 500;
}

/* Serif display helper — uppercase editorial */
.display {
  font-family: var(--font-serif);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-weight: 500;
}

/* ---- Eyebrow / label ---- */
.eyebrow {
  font-family: var(--font-sans);
  font-size: var(--fs-eyebrow);
  text-transform: uppercase;
  letter-spacing: var(--ls-eyebrow);
  font-weight: 500;
  color: var(--c-accent-ink);
  display: inline-block;
}
.eyebrow--mute { color: var(--c-ink-mute); }

.label {
  font-family: var(--font-sans);
  font-size: var(--fs-meta);
  text-transform: uppercase;
  letter-spacing: var(--ls-label);
  font-weight: 500;
}

.meta {
  font-size: var(--fs-meta);
  color: var(--c-ink-mute);
  letter-spacing: 0.02em;
}

/* ---- Body copy ---- */
p { max-width: var(--maxw-read); }
p + p { margin-top: var(--sp-4); }

strong, b { font-weight: 600; color: var(--c-ink); }
em, i { font-style: italic; }

.lede {
  font-family: var(--font-serif);
  font-size: var(--fs-body-lg);
  line-height: 1.5;
  color: var(--c-ink-soft);
  font-weight: 400;
  max-width: 60ch;
}

/* ---- Prose (lesson bodies) ---- */
.prose { max-width: var(--maxw-read); }
.prose > * + * { margin-top: var(--sp-4); }
.prose h4 { margin-top: var(--sp-6); }
.prose h5 { margin-top: var(--sp-5); color: var(--c-taupe-deep); }
.prose ul, .prose ol { padding-left: 1.3em; }
.prose li + li { margin-top: 0.5em; }
.prose li { padding-left: 0.2em; }
.prose ul { list-style: none; padding-left: 0; }
.prose ul > li {
  position: relative;
  padding-left: 1.35em;
}
.prose ul > li::before {
  content: "";
  position: absolute;
  left: 0.1em; top: 0.72em;
  width: 6px; height: 6px;
  border: 1px solid var(--c-olive);
  transform: rotate(45deg);
}

/* ---- Layout primitives ---- */
.wrap { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: clamp(1.2rem, 4vw, 3rem); }
.wrap--narrow { max-width: var(--maxw-narrow); }
.section { padding-block: var(--sp-8); }
.section--tight { padding-block: var(--sp-7); }

.band { background: var(--c-raised); }
.band--sand { background: var(--c-sand); }
.band--raised2 { background: var(--c-raised-2); }
.band--dark { background: var(--c-dark); color: var(--c-ink-invert); }
.band--dark h1, .band--dark h2, .band--dark h3, .band--dark h4 { color: var(--c-ink-invert); }
.band--dark .eyebrow { color: var(--c-sand); }
.band--dark .meta, .band--dark p { color: #C9BDA9; }

/* Grid helpers */
.grid { display: grid; gap: var(--sp-5); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 900px) { .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 620px) { .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; } }

/* Responsive split grids — replace inline grid-template-columns so they
   collapse to a single column on narrow viewports (editorial two-up blocks).
   .grid--split covers 1fr 1fr, 0.9/1.1, 0.85/1.15 style two-column layouts. */
.grid--split   { grid-template-columns: 1fr 1fr; }
.grid--split-l { grid-template-columns: 0.9fr 1.1fr; }   /* text | card */
.grid--split-r { grid-template-columns: 0.85fr 1.15fr; } /* recap | printables */
@media (max-width: 860px) {
  .grid--split, .grid--split-l, .grid--split-r { grid-template-columns: 1fr; }
}

.stack > * + * { margin-top: var(--sp-4); }
.stack-lg > * + * { margin-top: var(--sp-6); }

.center { text-align: center; }
.measure { max-width: var(--maxw-read); }
.mx-auto { margin-inline: auto; }

/* Section heading block */
.sec-head { max-width: 46rem; }
.sec-head .eyebrow { margin-bottom: var(--sp-3); }
.sec-head h2 + p, .sec-head h3 + p { margin-top: var(--sp-4); color: var(--c-ink-soft); }

/* Ornamental rule — botanical hairline */
.rule {
  border: 0; height: 1px;
  background: linear-gradient(90deg, transparent, var(--c-sand-deep) 12%, var(--c-sand-deep) 88%, transparent);
  margin-block: var(--sp-6);
}
.rule--short { max-width: 68px; margin-inline: 0; height: 2px;
  background: var(--c-olive); }
.rule--center { margin-inline: auto; }

/* Utility */
.hide { display: none !important; }
[hidden] { display: none !important; }
.nowrap { white-space: nowrap; }
.mono-num { font-variant-numeric: tabular-nums; }

/* Skip link */
.skip {
  position: absolute; left: -999px; top: 0;
  background: var(--c-ink); color: var(--c-page);
  padding: 0.6rem 1rem; z-index: 200; border-radius: 0 0 var(--radius) 0;
}
.skip:focus { left: 0; }

/* Reveal-on-scroll (progressive enhancement, safe without JS) */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease); }
.reveal.is-in, .no-js .reveal { opacity: 1; transform: none; }