/* Project Horizon v02
 * Monochrome on Ice. Single sage accent (Four Leaf Clover) used sparingly.
 * Palette.
 */

/* ── Tokens ────────────────────────────────────────────────────────────── */
:root {
  /* Brand palette */
  --liquorice:   #1C1C1C;
  --ice:         #F0F6F0;
  --ancient-pine:#494C49;
  --clover:      #6E8E58;
  --wheat:       #DDEAD6;

  /* Surfaces */
  --bg:          var(--ice);
  --ink:         var(--liquorice);
  --ink-soft:    var(--ancient-pine);
  --accent:      var(--clover);
  --rule:        rgba(28, 28, 28, 0.16);

  /* Type */
  --font-display: "Boska", Georgia, "Times New Roman", serif;
  --font-body:    "Switzer", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;

  /* Widths */
  --w-page:  72rem;     /* outer page max */
  --w-prose: 45rem;     /* ~720px prose column */
  --w-wide:  60rem;     /* hero / image / diagram breakout */

  /* Rhythm */
  --gap-1: 0.5rem;
  --gap-2: 1rem;
  --gap-3: 1.5rem;
  --gap-4: 2.25rem;
  --gap-5: 3.5rem;
  --gap-6: 5.5rem;
}

/* ── Reset / base ──────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1rem;          /* 16px mobile */
  line-height: 1.55;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

@media (min-width: 720px) {
  body { font-size: 1.0625rem; line-height: 1.6; }  /* ~17px desktop */
}

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

p { margin: 0 0 var(--gap-2); }
p:last-child { margin-bottom: 0; }

a {
  color: var(--ink);
  text-decoration-color: var(--rule);
  text-underline-offset: 0.2em;
  text-decoration-thickness: 1px;
  transition: text-decoration-color 0.15s ease;
}
a:hover { text-decoration-color: var(--ink); }

/* Headings */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 500;
  color: var(--ink);
  margin: 0;
  letter-spacing: -0.005em;
  line-height: 1.15;
}

h1 { font-size: clamp(2rem, 4.6vw + 1rem, 3.5rem); line-height: 1.08; }
h2 { font-size: clamp(1.4rem, 1.4vw + 1rem, 1.875rem); line-height: 1.2; margin-top: var(--gap-5); margin-bottom: var(--gap-3); }
h3 { font-family: var(--font-body); font-weight: 600; font-size: 1.0625rem; letter-spacing: 0; margin-top: var(--gap-4); margin-bottom: var(--gap-2); }

/* Eyebrow / kicker */
.kicker {
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-soft);
  display: block;
  margin: 0 0 var(--gap-2);
}

/* Skip link */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--ink);
  color: var(--ice);
  padding: 0.5rem 0.875rem;
  z-index: 100;
  text-decoration: none;
  font-size: 0.875rem;
}
.skip-link:focus { top: 0; }

/* ── Layout containers ────────────────────────────────────────────────── */
.wrap        { max-width: var(--w-page); margin-inline: auto; padding-inline: 1.25rem; }
.wrap-prose  { max-width: var(--w-prose); margin-inline: auto; padding-inline: 1.25rem; }
.wrap-wide   { max-width: var(--w-wide); margin-inline: auto; padding-inline: 1.25rem; }

@media (min-width: 720px) {
  .wrap, .wrap-prose, .wrap-wide { padding-inline: 2rem; }
}

/* ── Header / nav ─────────────────────────────────────────────────────── */
.site-header {
  border-bottom: 1px solid var(--rule);
  background: var(--bg);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-block: 1.125rem;
  flex-wrap: wrap;
}

.brand {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.125rem;
  letter-spacing: -0.005em;
  color: var(--ink);
  text-decoration: none;
  white-space: nowrap;
}
.brand:hover { text-decoration: none; }

.site-nav {
  display: flex;
  gap: 1.25rem;
  font-size: 0.9375rem;
  font-weight: 500;
}
.site-nav a {
  color: var(--ink-soft);
  text-decoration: none;
  padding-block: 0.25rem;
  border-bottom: 1px solid transparent;
}
.site-nav a:hover { color: var(--ink); }
.site-nav a[aria-current="page"] {
  color: var(--ink);
  border-bottom-color: var(--accent);  /* sage accent is the only accent use here */
}

@media (min-width: 720px) {
  .site-nav { gap: 2rem; }
}

/* ── Page head (interior pages) ───────────────────────────────────────── */
/* Tightened — reduced padding by ~30% to bring kicker/H1/lede closer together */
.page-head {
  max-width: var(--w-prose);
  margin-inline: auto;
  padding: var(--gap-4) 1.25rem var(--gap-2);
}
.page-head .kicker { margin-bottom: 0.75rem; }
.page-head h1 { margin-bottom: 0.4em; }
@media (min-width: 720px) {
  .page-head { padding: var(--gap-5) 2rem var(--gap-3); }
}

/* Lede paragraph — slightly larger, slightly heavier than body */
.lede {
  font-size: 1.1875rem;
  font-weight: 500;
  line-height: 1.5;
  color: var(--ink);
  max-width: 60ch;
}
@media (min-width: 720px) {
  .lede { font-size: 1.25rem; line-height: 1.5; }
}
.prose > .lede:first-child,
.prose > .lede { margin-bottom: var(--gap-3); }

/* ── Hero (home) ──────────────────────────────────────────────────────── */
/* Tightened top padding so H1 sits closer to the header */
.hero {
  padding: var(--gap-3) 0 var(--gap-4);
}
.hero__inner {
  max-width: var(--w-prose);
  margin-inline: auto;
  padding-inline: 1.25rem;
}
.hero h1 {
  max-width: 22ch;
  margin-block: 0 0.5em;
  /* Extra top padding so display numerals are never clipped */
  padding-top: 0.1em;
}
.hero__lede {
  font-size: 1.1875rem;
  font-weight: 500;
  line-height: 1.5;
  color: var(--ink);
  max-width: 60ch;
}
@media (min-width: 720px) {
  .hero { padding: var(--gap-4) 0 var(--gap-5); }
  .hero__inner { padding-inline: 2rem; }
  .hero__lede { font-size: 1.25rem; }
}

.hero__image {
  margin-block: var(--gap-4);
}
.hero__image img {
  width: 100%;
  height: auto;
  display: block;
}
.hero__image figcaption {
  max-width: var(--w-prose);
  margin: var(--gap-2) auto 0;
  padding-inline: 1.25rem;
  font-size: 0.875rem;
  color: var(--ink-soft);
  line-height: 1.5;
}
@media (min-width: 720px) {
  .hero__image figcaption { padding-inline: 2rem; }
}

/* ── Prose ────────────────────────────────────────────────────────────── */
.prose {
  max-width: var(--w-prose);
  margin-inline: auto;
  padding: 0 1.25rem var(--gap-6);
}
@media (min-width: 720px) {
  .prose { padding: 0 2rem var(--gap-6); }
}
.prose p { max-width: 62ch; }
.prose h2:first-child { margin-top: 0; }

.prose strong { font-weight: 600; }

/* Topic blocks (home) */
.topics {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--rule);
}
.topic {
  border-bottom: 1px solid var(--rule);
  padding-block: var(--gap-4);
}
/* First topic — subtle Wheat tint to anchor the eye */
.topic--lead {
  background: var(--wheat);
  margin-inline: calc(-1 * 1.25rem);
  padding-inline: 1.25rem;
}
@media (min-width: 720px) {
  .topic--lead { margin-inline: calc(-1 * 2rem); padding-inline: 2rem; }
}
.topic__inner {
  display: block;
}
.topic__body h2 {
  margin: 0 0 var(--gap-2);
  font-size: clamp(1.375rem, 1.6vw + 0.9rem, 1.75rem);
  letter-spacing: -0.005em;
}
.topic__body p {
  color: var(--ink);
  max-width: 60ch;
  margin: 0 0 var(--gap-2);
}
.topic__more {
  display: inline-block;
  margin-top: var(--gap-1);
  font-weight: 500;
  font-size: 0.9375rem;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--ink);
  padding-bottom: 0.125rem;
}
.topic__more:hover { color: var(--accent); border-bottom-color: var(--accent); }



/* ── Numeric facts row (water) ────────────────────────────────────────── */
/* Structured row — each tile gets its own hairline above */
.factrow {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  margin: var(--gap-4) 0;
  padding: 0;
}
.factrow > div {
  border-top: 1px solid var(--ink);
  padding: var(--gap-3) 0 var(--gap-3);
}
.fact__num {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(2rem, 3vw + 1rem, 2.75rem);
  /* Generous line-height + top padding so Boska numerals never appear clipped */
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--ink);
  display: block;
  margin-bottom: var(--gap-3);
  padding-top: 0.15em;
}
.fact__label {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--ink-soft);
  line-height: 1.45;
  max-width: 24ch;
}
@media (min-width: 640px) {
  .factrow { grid-template-columns: repeat(3, 1fr); column-gap: var(--gap-4); }
  .factrow > div { padding-right: var(--gap-2); }
}

/* ── Diagram ──────────────────────────────────────────────────────────── */
.diagram {
  margin: var(--gap-4) 0 var(--gap-5);
}
.diagram__title {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.9375rem;
  letter-spacing: 0.02em;
  margin: 0 0 var(--gap-2);
  color: var(--ink);
}
.diagram__sub {
  font-size: 0.9375rem;
  color: var(--ink-soft);
  max-width: 56ch;
  margin: 0 0 var(--gap-3);
}
.diagram__svg {
  background: var(--wheat);
  border: none;
  padding: var(--gap-4);
  width: 100%;
}
.diagram__svg svg { width: 100%; height: auto; }
/* Caption now sits BELOW the SVG and contains both the title and the sub line. */
.diagram__caption {
  margin-top: var(--gap-3);
  color: var(--ink);
}
.diagram__caption .diagram__title { margin: 0 0 var(--gap-2); }
.diagram__caption .diagram__sub { margin: 0; }

/* On wider screens, let the diagram break out beyond the prose column,
   but keep the caption aligned with the prose column (subtitles, body). */
@media (min-width: 800px) {
  .prose .diagram { margin-inline: clamp(-7rem, -7vw, -2rem); }
  .prose .diagram__caption {
    margin-inline: clamp(2rem, 7vw, 7rem) 0;
  }
}

/* ── Footer ───────────────────────────────────────────────────────────── */
.site-footer {
  margin-top: var(--gap-6);
  border-top: 1px solid var(--rule);
  padding-block: var(--gap-4) var(--gap-3);
  font-size: 0.875rem;
  color: var(--ink-soft);
  line-height: 1.55;
}
.site-footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--gap-4) var(--gap-5);
  align-items: start;
}
/* Stacked layout — pixel logo sits on its own line above the about block.
   Logo and text share the same left edge so they read as one block. */
.site-footer__about {
  display: block;
}
.site-footer__about > h2,
.site-footer__about > p {
  margin-left: 0;
  padding-left: 0;
}
.site-footer__about > p {
  margin: 0;
  font-style: normal;
}
.site-footer h2 {
  font-family: var(--font-body);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin: 0 0 var(--gap-1);
}
.site-footer__pages {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4em 1.5rem;
}
.site-footer__pages li { margin: 0; }
.site-footer__pages a {
  color: var(--ink);
  text-decoration: none;
}
.site-footer__pages a:hover { color: var(--accent); }

.site-footer__strip {
  margin-top: var(--gap-4);
  padding-top: var(--gap-2);
  border-top: 1px solid var(--rule);
  font-size: 0.8125rem;
  color: var(--ink-soft);
}

@media (min-width: 720px) {
  .site-footer__grid { grid-template-columns: 1.6fr 1fr; gap: var(--gap-3) var(--gap-6); }
}

/* ── Focus styles (accessibility) ─────────────────────────────────────── */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 1px;
}

/* Print: keep body text legible, drop nav */
@media print {
  .site-nav, .skip-link { display: none; }
}