/* ============================================================
   Solto — shared base + Home sections
   Chrome + section helpers read semantic theme tokens (--page-bg,
   --display-fg, --rule …) so a page flips light with class "t-light".
   The hero is always-dark (home only) and keeps explicit colors.
   ============================================================ */

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

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

body {
  background: var(--page-bg);
  color: var(--page-fg);
  font-family: var(--font-body);
  font-size: var(--type-body);
  line-height: var(--leading-body);
  font-synthesis: none;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  min-height: 100svh;
  overflow-x: hidden;
}

p { text-wrap: pretty; }
h1, h2 { text-wrap: balance; font-weight: var(--display-weight); }
a { color: inherit; }

.display {
  font-family: var(--font-condensed);
  font-weight: var(--display-weight);
  text-transform: var(--display-transform);
  letter-spacing: var(--display-tracking);
  line-height: var(--display-leading);
}

/* --- Texture: fine grain + a low warm glow (dark pages only) --
   Fixed, pointer-none — never on scrolling containers (perf). */
.grain, .glow { position: fixed; inset: 0; pointer-events: none; z-index: 0; }
.glow {
  background:
    radial-gradient(48% 40% at 84% 88%, rgba(201, 123, 86, 0.20), transparent 70%),
    radial-gradient(42% 38% at 92% 12%, rgba(232, 200, 180, 0.12), transparent 72%);
}
.t-light .glow { display: none; }
.grain {
  opacity: 0.05;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  mix-blend-mode: overlay;
}
.t-light .grain { opacity: 0.035; mix-blend-mode: multiply; }

/* --- Header ----------------------------------------------- */
.site-header { position: absolute; inset: 0 0 auto 0; z-index: 4; padding: clamp(1.4rem, 1rem + 1.4vw, 2.2rem) 0; }
.site-header.is-solid { position: relative; }   /* subpages: header in flow, not over a hero */
.site-header .bar {
  display: flex; align-items: baseline; justify-content: space-between;
  padding-inline: var(--gutter);
  max-width: var(--page-max); margin-inline: auto;
}
.site-nav { display: flex; gap: clamp(1rem, 0.5rem + 1.2vw, 2.25rem); align-items: center; }
.nav-cta {
  font-family: var(--font-body); font-weight: 600; font-size: var(--type-small);
  color: var(--ground-deep); background: var(--blush);
  padding: 0.55rem 1.1rem; border-radius: var(--radius); text-decoration: none; white-space: nowrap;
  transition: background-color var(--dur-hover) var(--ease-soft);
}
.nav-cta:hover { background: var(--blush-bright); }
.wordmark {
  font-family: var(--font-condensed);
  text-transform: uppercase; letter-spacing: 0.16em;
  font-size: 1.15rem; color: var(--display-fg); text-decoration: none;
}
.nav-link {
  font-family: var(--font-body); font-size: var(--type-small); font-weight: 500;
  letter-spacing: 0.02em; color: var(--page-fg); text-decoration: none;
  padding-bottom: 2px; border-bottom: 1px solid transparent;
  transition: border-color var(--dur-hover) var(--ease-soft);
}
.nav-link:hover { border-color: var(--display-fg); }
.nav-link.is-cta { color: var(--display-fg); font-weight: 600; }

/* --- Buttons (blush; works on light and dark) ------------- */
.btn {
  --btn-bg: var(--blush);
  align-self: flex-start; display: inline-flex; align-items: center;
  font-family: var(--font-body); font-size: 1.0625rem; font-weight: 600; line-height: 1;
  color: var(--ground-deep); background: var(--btn-bg); border: none;
  border-radius: var(--radius); padding: 1.05rem 1.7rem; text-decoration: none; cursor: pointer;
  transition: background-color var(--dur-hover) var(--ease-soft), transform var(--dur-hover) var(--ease-soft);
}
.btn:hover { --btn-bg: var(--blush-bright); }
.btn:active { transform: translateY(1px); }

/* --- Section helpers -------------------------------------- */
.section { position: relative; z-index: 1; padding-inline: var(--gutter); }
.section-inner { max-width: var(--page-max); margin-inline: auto; }
.kicker {
  font-family: var(--font-mono); font-size: var(--type-mono);
  letter-spacing: var(--tracking-mono); text-transform: uppercase; color: var(--display-fg);
}
.section-title {
  font-size: var(--type-display); color: var(--display-fg);
  line-height: var(--display-leading); letter-spacing: var(--display-tracking); max-width: 18ch;
}

/* ============================================================
   HERO (home only — always dark)
   ============================================================ */
.hero { position: relative; z-index: 1; min-height: 84svh; display: grid; grid-template-columns: 1.04fr 0.96fr; align-items: stretch; }
/* intentional breathing room between the hero and the content trio */
.page-gap { height: clamp(7rem, 18vh, 15rem); }
.hero-content { display: flex; flex-direction: column; justify-content: center; padding: clamp(5.5rem, 4rem + 3vw, 7.5rem) clamp(2rem, 1rem + 3vw, 4rem) var(--space-lg) var(--gutter); max-width: 46rem; }
.hero-headline { font-size: var(--type-hero); color: var(--blush); margin-bottom: clamp(1.75rem, 1rem + 2vw, 2.75rem); }
.hero-headline .hl-accent { color: var(--cream); }
.hero-headline .cohere { white-space: nowrap; }


/* --- Scroll cue (hero bottom) + full-bleed top/bottom divider --- */
.scroll-wrap { display: flex; justify-content: center; padding-block: clamp(1.5rem, 4vh, 3.5rem); }
.scroll-cue { display: inline-flex; flex-direction: column; align-items: center; gap: 0.7rem; text-decoration: none; }
.scroll-cue-label {
  font-family: var(--font-mono); font-size: var(--type-mono); letter-spacing: var(--tracking-mono);
  text-transform: uppercase; color: var(--cream-faint); transition: color var(--dur-hover) var(--ease-soft);
}
.scroll-cue:hover .scroll-cue-label { color: var(--blush); }
.scroll-cue-line {
  position: relative; width: 1px; height: 46px; overflow: hidden;
  background: color-mix(in oklab, var(--cream) 22%, var(--ground));
}
.scroll-cue-line::after {
  content: ''; position: absolute; left: 0; top: 0; width: 100%; height: 45%;
  background: var(--blush); animation: scroll-dot 1.9s var(--ease-soft) infinite;
}
@keyframes scroll-dot { 0% { transform: translateY(-110%); } 60%, 100% { transform: translateY(230%); } }
@media (prefers-reduced-motion: reduce) { .scroll-cue-line::after { animation: none; transform: translateY(55%); } }
@media (max-width: 859px) { .scroll-wrap { display: none; } }

/* --- Hero figure (art-directed image, duotone, bleeds) ----- */
.hero-figure { position: relative; overflow: hidden; background: var(--ground); }
.hero-figure img {
  position: absolute; inset: 0; width: 100%; height: 100%;
  object-fit: cover; object-position: 50% 38%;
  filter: grayscale(1) contrast(1.06) brightness(1.12);
  mix-blend-mode: multiply;
}
.hero-figure::before { content: ''; position: absolute; inset: 0; background: var(--blush); mix-blend-mode: screen; opacity: 0.14; }
.hero-figure::after { content: ''; position: absolute; inset: 0; background: linear-gradient(90deg, var(--ground) 0%, rgba(20,64,43,0) 28%, rgba(20,64,43,0) 100%); }
.figure-caption {
  position: absolute; left: clamp(1rem, 0.5rem + 1vw, 1.75rem); bottom: clamp(1rem, 0.5rem + 1vw, 1.75rem); z-index: 2;
  font-family: var(--font-mono); font-size: var(--type-mono); letter-spacing: var(--tracking-mono);
  text-transform: uppercase; color: var(--cream); opacity: 0.7;
}

/* ============================================================
   HOME sections below the hero
   ============================================================ */
/* Lede sections (The Head, The Heart): kicker + title left, paragraph
   right, TOP-aligned (title top lines up with the paragraph top). */
.lede { padding-block: var(--space-xl); }
.lede-grid { display: grid; gap: clamp(1.25rem, 1rem + 1.5vw, 2rem); }
.lede .section-title { font-size: clamp(1.9rem, 1.3rem + 2.6vw, 3.2rem); }
.lede .prose { font-size: var(--type-lead); line-height: 1.62; color: var(--muted-fg); max-width: 42ch; }
.lede .prose p + p { margin-top: 0.9rem; }
.shape-list { list-style: none; margin-top: var(--space-md); display: grid; gap: var(--space-sm); }
.shape-list li { position: relative; padding-left: 1.4rem; }
.shape-list li::before { content: ''; position: absolute; left: 0; top: 0.6em; width: 0.38rem; height: 0.38rem; border-radius: 50%; background: var(--display-fg); }
.shape-list strong { color: var(--page-fg); font-weight: 600; }
/* numbered index rail (01 / The Head) */
.lede-index { display: flex; flex-direction: column; gap: 0.4rem; }
.lede-num { font-family: var(--font-mono); font-size: 1rem; letter-spacing: 0.06em; color: var(--display-fg); font-variant-numeric: tabular-nums; }
.lede-name { font-family: var(--font-mono); font-size: var(--type-mono); letter-spacing: var(--tracking-mono); text-transform: uppercase; color: var(--faint-fg); }
@media (min-width: 860px) {
  .lede-grid {
    grid-template-columns: minmax(5.5rem, 8rem) minmax(0, 1.1fr) minmax(0, 0.95fr);
    grid-template-areas: "index title prose";
    column-gap: clamp(1.5rem, 0.8rem + 2.6vw, 4rem);
    align-items: start;
  }
  .lede-index { grid-area: index; padding-top: 0.5rem; }
  .lede .section-title { grid-area: title; }
  .lede .prose { grid-area: prose; }
}
/* very thin separator between lede sections */
.lede-sep { border: 0; border-top: 1px solid var(--rule); max-width: var(--page-max); margin-inline: auto; }
/* placeholder line (e.g. The Engine's left line, awaiting Shannon's copy) */
.section-title.is-slot { color: var(--faint-fg); font-weight: var(--display-weight); }
/* copy slot — clearly-marked placeholder until Shannon fills it */
.slot { color: var(--faint-fg); }

/* How we work — page intro */
.hww-intro { padding-block: clamp(4rem, 3rem + 4vw, 7rem) var(--space-lg); }
.hww-title { font-size: clamp(2rem, 1.4rem + 2.8vw, 3.4rem); color: var(--display-fg); line-height: var(--display-leading); letter-spacing: var(--display-tracking); max-width: 22ch; margin-top: var(--space-md); }

/* ============================================================
   FOOTER (shared)
   ============================================================ */
.site-footer { position: relative; z-index: 1; margin-top: var(--space-3xl); padding: var(--space-3xl) var(--gutter) var(--space-xl); border-top: 1px solid var(--rule); }
/* slim variant — just the nav/brand line, no big block or top space */
.site-footer.is-slim { margin-top: 0; padding-top: var(--space-xl); border-top: none; }
.site-footer.is-slim .footer-line { margin-bottom: var(--space-xl); }
.footer-cta { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: var(--space-lg); margin-bottom: var(--space-xl); max-width: var(--page-max); margin-inline: auto; }
.footer-line { font-family: var(--font-body); font-size: clamp(1.15rem, 1rem + 0.6vw, 1.45rem); line-height: 1.5; color: var(--page-fg); max-width: 48ch; }
.footer-meta { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: var(--space-md); padding-top: var(--space-lg); border-top: 1px solid var(--rule); font-size: var(--type-small); color: var(--muted-fg); max-width: var(--page-max); margin-inline: auto; }
.footer-meta .wordmark { font-size: 1rem; }
.footer-nav { display: flex; gap: clamp(1rem, 0.5rem + 1.5vw, 2rem); }
.footer-nav a { text-decoration: none; color: var(--muted-fg); transition: color var(--dur-hover) var(--ease-soft); }
.footer-nav a:hover { color: var(--display-fg); }
.footer-social { display: inline-flex; align-items: center; }
.footer-social svg { width: 18px; height: 18px; fill: currentColor; display: block; }
.footer-tag { font-family: var(--font-mono); font-size: var(--type-mono); letter-spacing: var(--tracking-mono); text-transform: uppercase; color: var(--faint-fg); }

/* ============================================================
   Legal / prose pages (privacy)
   ============================================================ */
.legal { padding-block: clamp(4rem, 3rem + 4vw, 7rem) var(--space-3xl); }
.legal-inner { max-width: 46rem; margin-inline: auto; }
.legal-title { font-size: clamp(2rem, 1.4rem + 2.6vw, 3.2rem); color: var(--display-fg); line-height: var(--display-leading); letter-spacing: var(--display-tracking); margin-top: var(--space-md); }
.legal-updated { margin-top: var(--space-sm); font-family: var(--font-mono); font-size: var(--type-mono); letter-spacing: var(--tracking-mono); text-transform: uppercase; color: var(--faint-fg); }
.legal-body { margin-top: var(--space-xl); }
.legal-body h2 { font-family: var(--font-condensed); font-weight: var(--display-weight); font-size: clamp(1.3rem, 1.1rem + 0.7vw, 1.65rem); color: var(--page-fg); margin-top: var(--space-lg); margin-bottom: var(--space-xs); }
.legal-body p, .legal-body li { color: var(--muted-fg); font-size: 1.0625rem; line-height: 1.6; }
.legal-body p + p { margin-top: var(--space-sm); }
.legal-body ul { margin-top: var(--space-xs); padding-left: 1.2rem; display: grid; gap: 0.4rem; }
.legal-body a { color: var(--display-fg); }

/* ============================================================
   Reveal + a11y + mobile
   ============================================================ */
.split-line { display: block; }
html.pre-reveal [data-split] { visibility: hidden; }
html.pre-reveal .reveal { opacity: 0; }

:focus-visible { outline: var(--focus-ring); outline-offset: 3px; border-radius: 1px; }

/* visually hidden but available to screen readers / SEO (e.g. a page h1) */
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); clip-path: inset(50%); white-space: nowrap; border: 0;
}

@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

@media (max-width: 859px) {
  .hero { grid-template-columns: 1fr; grid-template-rows: auto 42svh; }
  .hero-content { padding: clamp(6rem, 5rem + 6vw, 8rem) var(--gutter) clamp(2.5rem, 2rem + 3vw, 4rem); max-width: none; order: 1; }
  .hero-figure { order: 2; }
  .hero-figure::after { background: linear-gradient(0deg, rgba(20,64,43,0) 60%, var(--ground) 100%), linear-gradient(180deg, var(--ground) 0%, rgba(20,64,43,0) 30%); }
}
/* ============================================================
   Mobile nav (hamburger)
   Button + overlay are injected by site.js (links cloned from
   .site-nav, so they never drift). Themed via tokens → flips with
   the page. No-JS falls back to the footer nav.
   ============================================================ */
.nav-toggle {
  display: none; -webkit-appearance: none; appearance: none;
  background: none; border: 0; cursor: pointer; color: var(--page-fg);
  width: 2.75rem; height: 2.75rem; align-items: center; justify-content: center;
  margin-right: -0.6rem;   /* optical: pull to the gutter edge */
}
.nav-toggle-bars, .nav-toggle-bars::before, .nav-toggle-bars::after {
  content: ''; display: block; width: 1.5rem; height: 2px;
  background: currentColor; border-radius: 2px;
  transition: transform var(--dur-hover) var(--ease-soft), opacity var(--dur-hover) var(--ease-soft);
}
.nav-toggle-bars { position: relative; }
.nav-toggle-bars::before { position: absolute; left: 0; top: -0.45rem; }
.nav-toggle-bars::after  { position: absolute; left: 0; top: 0.45rem; }
.nav-open .nav-toggle-bars { background: transparent; }              /* → X */
.nav-open .nav-toggle-bars::before { transform: translateY(0.45rem) rotate(45deg); }
.nav-open .nav-toggle-bars::after  { transform: translateY(-0.45rem) rotate(-45deg); }

.mobile-menu {
  position: fixed; inset: 0; z-index: 30; background: var(--page-bg); overflow-y: auto;
  opacity: 0; visibility: hidden;
  transition: opacity var(--dur-hover) var(--ease-soft), visibility var(--dur-hover) var(--ease-soft);
}
.nav-open .mobile-menu { opacity: 1; visibility: visible; }
.nav-open .site-header { z-index: 60; }   /* keep wordmark + close (X) above the overlay */
.mobile-nav {
  display: flex; flex-direction: column; align-items: flex-start;
  gap: clamp(0.4rem, 0.2rem + 1vw, 1rem);
  padding: clamp(6.5rem, 5.5rem + 8vw, 9rem) var(--gutter) var(--space-3xl);
}
.mobile-nav a {
  font-family: var(--font-condensed); font-weight: var(--display-weight);
  font-size: clamp(2.3rem, 1.6rem + 4vw, 3.4rem); line-height: 1.06;
  letter-spacing: var(--display-tracking); color: var(--display-fg);
  text-decoration: none; background: none; border: 0; padding: 0.15rem 0;
}
.mobile-nav a[aria-current="page"] { opacity: 0.45; }

@media (prefers-reduced-motion: reduce) {
  .mobile-menu,
  .nav-toggle-bars, .nav-toggle-bars::before, .nav-toggle-bars::after { transition: none; }
}
@media (max-width: 639px) {
  .site-nav { display: none; }
  .nav-toggle { display: inline-flex; }
}
@media (min-width: 640px) { .mobile-menu { display: none; } }   /* desktop: never show the overlay */