/* Article shell: header, hero, section rhythm, stat strip, reading rail. */

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

.sv-layout {
  color: var(--sv-ink);
  font-family: var(--sv-sans);
  font-size: 15px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.sv-layout a { color: var(--sv-green-deep); }

.sv-mono {
  font-family: var(--sv-mono);
  font-variant-numeric: tabular-nums;
}

/* ---------- header ---------- */

.sv-header {
  position: sticky;
  top: 0;
  z-index: 40;
  height: var(--sv-header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 4vw;
  border-bottom: 1px solid var(--sv-rule);
  background: rgba(250, 250, 250, .94);
  backdrop-filter: blur(8px);
}

.sv-header__brand {
  font-family: var(--sv-mono);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--sv-green);
}

.sv-header__nav {
  display: flex;
  gap: 22px;
  font-size: 12px;
  color: var(--sv-muted);
}

.sv-header__nav a { color: inherit; text-decoration: none; }
.sv-header__nav a:hover { color: var(--sv-green); }

/* ---------- article grid ---------- */

.sv-layout {
  display: grid;
  grid-template-columns: minmax(0, var(--sv-measure)) var(--sv-sidebar);
  justify-content: center;
  gap: 40px;
  width: min(calc(var(--sv-measure) + var(--sv-sidebar) + 40px), 94vw);
  margin: 0 auto;
  align-items: start;
}

.sv-article { grid-column: 1; min-width: 0; }

.sv-article [id] { scroll-margin-top: var(--sv-scroll-offset); }

/* ---------- reading rail ---------- */

.sv-rail {
  grid-column: 2;
  position: sticky;
  top: var(--sv-scroll-offset);
  padding-top: 8px;
}

.sv-rail__title {
  margin: 0 0 12px;
  font-family: var(--sv-mono);
  font-size: 10px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--sv-faint);
}

.sv-rail ol {
  margin: 0;
  padding: 0;
  list-style: none;
  border-left: 1px solid var(--sv-rule);
}

.sv-rail a {
  display: block;
  padding: 7px 0 7px 14px;
  margin-left: -1px;
  border-left: 1px solid transparent;
  color: var(--sv-muted);
  font-size: 12px;
  line-height: 1.45;
  text-decoration: none;
}

.sv-rail a:hover { color: var(--sv-ink); }

.sv-rail a[aria-current="location"] {
  border-left-color: var(--sv-green);
  color: var(--sv-ink);
  font-weight: 600;
}

/* ---------- hero ---------- */

.sv-hero { padding: 56px 0 14px; }

.sv-eyebrow {
  margin: 0 0 14px;
  font-family: var(--sv-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--sv-green);
}

.sv-hero h1 {
  margin: 0 0 18px;
  max-width: 21ch;
  text-wrap: balance;
  font-size: clamp(32px, 4.4vw, 52px);
  font-style: normal;
  line-height: 1.12;
  font-weight: 650;
  letter-spacing: -.015em;
  color: var(--sv-ink);
}

/* Top-aligned: centring the taller figure against the lede opens a gap under the h1. */
.sv-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(240px, .62fr);
  align-items: start;
  gap: 40px;
}

.sv-hero__copy { min-width: 0; }

.sv-hero__lede {
  margin: 0;
  font-size: 17px;
  line-height: 1.62;
  color: var(--sv-ink-soft);
}

.sv-hero__lede + .sv-hero__lede { margin-top: 14px; }

.sv-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 24px 0 0;
}

.sv-hero__actions .sv-action {
  display: inline-flex;
  min-height: 38px;
  align-items: center;
  justify-content: center;
  gap: 7px;
  padding: 8px 16px;
  border: 1px solid var(--sv-rule-strong);
  border-radius: var(--sv-radius);
  background: #fff;
  color: var(--sv-ink);
  font-family: var(--sv-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  text-decoration: none;
}

.sv-hero__actions .sv-action__icon {
  width: 14px;
  height: 14px;
  flex: none;
  fill: currentColor;
}

.sv-hero__actions .sv-action:hover {
  border-color: var(--sv-green);
  color: var(--sv-green);
}

.sv-hero__actions .sv-action--primary {
  border-color: var(--sv-green);
  background: var(--sv-green);
  color: #fff;
}

.sv-hero__actions .sv-action--primary:hover {
  border-color: var(--sv-green-deep);
  background: var(--sv-green-deep);
  color: #fff;
}

.sv-note .sv-code {
  border: 1px solid var(--sv-rule);
  background: var(--sv-ground-warm);
  color: var(--sv-ink);
}

.sv-hero__figure {
  margin: 0;
  max-width: 340px;
  justify-self: end;
}

.sv-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  /* the drawing carries its own rounded frame; multiply drops its white sheet into the ground */
  mix-blend-mode: multiply;
  filter: brightness(1.04) contrast(1.04);
}

/* ---------- stat strip ---------- */

.sv-stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin: 30px 0 8px;
  padding: 22px 0;
  border-top: 1px solid var(--sv-rule);
  border-bottom: 1px solid var(--sv-rule);
}

.sv-stat {
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  padding: 0 18px;
  min-width: 0;
}

.sv-stat:first-child { padding-left: 0; }
.sv-stat:last-child { padding-right: 0; }
.sv-stat + .sv-stat { border-left: 1px solid var(--sv-rule); }

.sv-stat strong {
  margin-bottom: 7px;
  font-family: var(--sv-mono);
  font-size: 34px;
  font-weight: 700;
  line-height: 1.05;
  color: var(--sv-green);
  font-variant-numeric: tabular-nums;
}

.sv-stat span {
  font-size: 11.5px;
  line-height: 1.55;
  color: var(--sv-muted-strong);
}

/* ---------- sections ---------- */

/* Only sections that follow another section draw a rule: the first one sits under the
   stat strip's own bottom border, and a second rule there just reads as a gap. */
.sv-section { padding: 36px 0 8px; }

.sv-section + .sv-section {
  padding-top: 44px;
  margin-top: 40px;
  border-top: 1px solid var(--sv-rule);
}

.sv-kicker {
  margin: 0 0 8px;
  font-family: var(--sv-mono);
  font-size: 10px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--sv-green);
}

.sv-section h2 {
  margin: 0 0 14px;
  font-size: clamp(22px, 2.6vw, 31px);
  line-height: 1.22;
  font-weight: 640;
  letter-spacing: -.01em;
  color: var(--sv-ink);
}

.sv-section p {
  margin: 0 0 14px;
  color: var(--sv-ink-soft);
}

.sv-section p.sv-note {
  font-size: 12px;
  line-height: 1.7;
  color: var(--sv-muted);
}

.sv-lede {
  font-size: 17px;
  line-height: 1.62;
}

/* ---------- responsive ---------- */

@media (max-width: 1080px) {
  .sv-layout {
    grid-template-columns: minmax(0, var(--sv-measure));
    width: min(var(--sv-measure), 94vw);
  }
  .sv-rail { display: none; }
}

@media (max-width: 860px) {
  .sv-hero__grid { grid-template-columns: minmax(0, 1fr); gap: 26px; }
  .sv-hero__figure { max-width: 280px; justify-self: start; }
}

@media (max-width: 720px) {
  .sv-header__nav { display: none; }
  .sv-stats { grid-template-columns: repeat(2, minmax(0, 1fr)); row-gap: 18px; }
  .sv-stat:nth-child(3) { border-left: 0; padding-left: 0; }
  .sv-hero { padding-top: 34px; }
  /* Prose paragraphs only: labels and notes are <p> with a class and keep their own size. */
  .sv-hero__lede, .sv-section p:where(:not([class])) { font-size: 16px; }
  /* Three buttons do not fit one phone row: the primary takes its own, the two others split
     the next, rather than leaving one stranded. */
  .sv-hero__actions { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .sv-hero__actions .sv-action--primary { grid-column: 1 / -1; }
}