/* ============================================================
   KAIROS — design tokens
   Ported from handoff/shared/tokens.css
   Editorial-first, un-euphemistic, typographic.
   Pure black and pure gray are forbidden.
   ============================================================ */

:root {
  /* ---------- Palette ---------- */
  --bone:        #F6F3EE;   /* base / page ground */
  --bone-2:      #EFEBE3;   /* card fill */
  --bone-3:      #E4DFD4;   /* deeper wash */
  --ink:         #1F2A24;   /* deep forest — primary type + dark sections */
  --ink-2:       #4A544E;   /* secondary type */
  --ink-3:       #8A8F87;   /* tertiary / meta */
  --hairline:    #D8D2C6;   /* rules */
  --moss:        #5D6E5A;   /* accent — moss */
  --copper:      #B48A5C;   /* accent — ochre / warm gold */
  --oxide:       #7A4A38;   /* accent — oxidized copper */
  --white:       #FFFFFF;   /* only the Resources crisis strip */

  /* ---------- Typography ---------- */
  --f-display:   'Fraunces', 'GT Sectra', 'Freight Big', 'Playfair Display', Georgia, serif;
  --f-sans:      'Inter', 'Söhne', -apple-system, BlinkMacSystemFont, 'Helvetica Neue', Arial, sans-serif;
  --f-mono:      'JetBrains Mono', 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  --f-wordmark:  'Cinzel', 'Optima', 'Albertus', var(--f-display);

  /* ---------- Scale ---------- */
  --t-mega:      clamp(56px, 9vw, 128px);
  --t-hero:      clamp(40px, 6vw, 88px);
  --t-h1:        clamp(32px, 4.4vw, 64px);
  --t-h2:        clamp(24px, 2.8vw, 40px);
  --t-h3:        20px;
  --t-body:      17px;
  --t-small:     14px;
  --t-micro:     11px;

  /* ---------- Space ---------- */
  --gutter:      clamp(20px, 4vw, 56px);
  --section-y:   clamp(80px, 12vh, 160px);

  /* ---------- Radius ---------- */
  --r-card:      8px;
  --r-inner:     4px;
  --r-pill:      999px;

  /* ---------- Motion ---------- */
  --ease-quiet:  cubic-bezier(.22,.61,.36,1);
}

/* ============================================================
   BASE RESET
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}
body {
  background: var(--bone);
  color: var(--ink);
  font-family: var(--f-sans);
  font-size: var(--t-body);
  line-height: 1.5;
  font-weight: 400;
  letter-spacing: -0.005em;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: none; padding: 0; cursor: pointer; }
::selection { background: var(--ink); color: var(--bone); }

/* Focus rings — moss ring, 2px offset (RECOMMENDATIONS.md accessibility item) */
:focus-visible {
  outline: 2px solid var(--moss);
  outline-offset: 2px;
  border-radius: 2px;
}

/* Skip-to-content — on every page, per the handoff README */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  background: var(--ink);
  color: var(--bone);
  padding: 12px 20px;
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border-radius: 0 0 var(--r-inner) 0;
}
.skip-link:focus {
  left: 0;
}

/* ============================================================
   TYPE UTILITIES
   ============================================================ */
.display { font-family: var(--f-display); font-weight: 300; letter-spacing: -0.025em; line-height: 1.02; }
.serif   { font-family: var(--f-display); }
.mono    { font-family: var(--f-mono); font-variant-ligatures: none; }
.meta    { font-family: var(--f-mono); font-size: 12px; color: var(--ink-3); letter-spacing: 0.02em; }

/* ============================================================
   SECTION-HEADER PATTERN (sitewide, the ONLY one)
   Small mono uppercase moss eyebrow with a leading dash rule.
   Renders "— KAIROS". Never followed by a display-serif h2.
   ============================================================ */
.eyebrow {
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--moss);
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 14px;
  margin: 0 0 20px;
}
.eyebrow::before {
  content: "";
  width: 32px;
  height: 1px;
  background: currentColor;
  display: inline-block;
  flex-shrink: 0;
}

/* ============================================================
   CARD SYSTEM — three voices
   ============================================================ */
.card-light,
.card-dark {
  border-radius: var(--r-card);
  transition: border-color .2s var(--ease-quiet);
}
.card-light {
  background: var(--bone-2);
  border: 1px solid var(--hairline);
  color: var(--ink);
}
.card-light:hover,
.card-light:focus-within { border-color: var(--ink); }

.card-dark {
  background: var(--ink);
  border: 1px solid var(--ink);
  color: var(--bone);
}

.card-callout {
  background: var(--bone-2);
  border: 1px solid var(--hairline);
  border-left: 2px solid var(--moss);
  border-radius: 0 var(--r-card) var(--r-card) 0;
  color: var(--ink);
}

/* ============================================================
   NAV — one system, two surfaces.

   .nav--dark   transparent overlay in bone, for pages opening on a
                dark band (home hero, .page-masthead).
   .nav--light  cream sticky bar in ink, for pages opening on bone
                (Shop, Sources, the six policy pages).
   .nav--mark-only  home page — phi mark alone, no wordmark, because
                the hero states the name at full scale.

   Shared geometry lives on .nav; only colour and positioning differ.
   The descriptor is not carried in the nav on any page.
   ============================================================ */
.nav {
  z-index: 40;
  display: flex; align-items: center; justify-content: space-between;
  gap: 24px;
  padding: clamp(18px, 2.6vh, 26px) var(--gutter);
}
.nav-brand {
  display: inline-flex;
  align-items: center;
  gap: 13px;
  line-height: 1;
  flex-shrink: 0;
}
.nav-phi {
  height: 26px;
  width: auto;
  display: block;
  flex-shrink: 0;
}
.nav-wordmark {
  font-family: var(--f-wordmark);
  font-weight: 500;
  font-size: 17px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  line-height: 1;
}
/* Home only — the hero carries the identity at full scale, so the nav
   drops the brand entirely and the links use the whole width. */
.nav--mark-only .nav-brand { display: none; }
.nav--mark-only .nav-links { margin-left: 0; }

.nav-links {
  display: flex; align-items: center;
  flex-wrap: nowrap;
  /* Items distribute evenly across the available track rather than
     bunching at the right edge. */
  justify-content: space-between;
  flex: 1 1 auto;
  margin-left: clamp(24px, 4vw, 64px);
  gap: clamp(12px, 1.6vw, 28px);
}
.nav-links a {
  /* Doubled from 14px. Fluid so it never overflows: at 28px the row needs
     ~700px of track, which is fine to 900px but overflows a 768px tablet. */
  font-size: clamp(17px, 1.95vw, 28px);
  font-family: var(--f-display);
  font-weight: 400;
  letter-spacing: 0.005em;
  white-space: nowrap;
  padding: 4px 0;
  border-bottom: 2px solid transparent;
  transition: color .2s var(--ease-quiet), border-color .2s var(--ease-quiet);
}
/* Active state carries a moss underline, not colour alone (WCAG 1.4.1). */
.nav-links a.active { border-bottom-color: var(--moss); }

/* ---------- DARK surface: transparent overlay on a dark band ---------- */
.nav--dark {
  /* Fixed to the viewport, not absolute: .hero and .page-masthead both
     create their own positioning/stacking contexts, which would trap an
     absolutely-positioned child. Fixed also keeps the nav reachable on
     long pages instead of scrolling away. */
  position: fixed; top: 0; left: 0; right: 0;
  background: transparent;
  transition: background .3s var(--ease-quiet), border-color .3s var(--ease-quiet);
  border-bottom: 1px solid transparent;
}
/* Once scrolled past the dark band, .nav--dark picks up a cream bar so the
   links stay legible over bone content. Toggled by /static/nav.js. */
.nav--dark.is-scrolled {
  background: rgba(246,243,238,.88);
  backdrop-filter: saturate(140%) blur(18px);
  -webkit-backdrop-filter: saturate(140%) blur(18px);
  border-bottom-color: var(--hairline);
}
.nav--dark.is-scrolled .nav-brand,
.nav--dark.is-scrolled .nav-wordmark { color: var(--ink); }
.nav--dark.is-scrolled .nav-phi { filter: none; }
.nav--dark.is-scrolled .nav-links a { color: var(--ink-2); }
.nav--dark.is-scrolled .nav-links a:hover,
.nav--dark.is-scrolled .nav-links a.active { color: var(--ink); }
.nav--dark .nav-brand,
.nav--dark .nav-wordmark { color: var(--bone); }
/* Source PNG is ink-black; invert to bone for the dark field. */
.nav--dark .nav-phi { filter: brightness(0) invert(1) opacity(.92); }
.nav--dark .nav-links a { color: rgba(246,243,238,.62); }
.nav--dark .nav-links a:hover,
.nav--dark .nav-links a.active { color: var(--bone); }

/* ---------- LIGHT surface: cream sticky bar ---------- */
.nav--light {
  position: sticky; top: 0;
  background: rgba(246,243,238,.82);
  backdrop-filter: saturate(140%) blur(18px);
  -webkit-backdrop-filter: saturate(140%) blur(18px);
  border-bottom: 1px solid var(--hairline);
}
.nav--light .nav-brand,
.nav--light .nav-wordmark { color: var(--ink); }
.nav--light .nav-links a { color: var(--ink-2); }
.nav--light .nav-links a:hover,
.nav--light .nav-links a.active { color: var(--ink); }

/* Breakpoint moved off 900px: the header needed ~903px to fit on one line,
   so links silently wrapped in the 900–905px band. */
@media (max-width: 680px) {
  .nav { flex-direction: column; align-items: flex-start; gap: 14px; }
  .nav-links {
    justify-content: flex-start; flex-wrap: wrap;
    row-gap: 10px; margin-left: 0; gap: 18px;
  }
  .nav-links a { font-size: 16px; }
}

/* ============================================================
   FOOTER — one continuous compliance row, 13px minimum
   ============================================================ */
.footer {
  padding: 18px var(--gutter);
  border-top: 1px solid var(--hairline);
  margin-top: 120px;
  font-size: 13px;
}
.footer-compliance {
  display: flex; flex-wrap: wrap;
  gap: 6px 28px;
  align-items: center;
}
.footer-compliance a {
  color: var(--ink-2);
  transition: color .15s var(--ease-quiet);
}
.footer-compliance a:hover,
.footer-compliance a:focus { color: var(--ink); }
.footer-legal {
  font-family: var(--f-mono);
  font-size: 13px;
  color: var(--ink-3);
  letter-spacing: 0.04em;
  cursor: default;
}

/* ============================================================
   PAGE MASTHEAD — full-bleed dark forest band
   ============================================================ */
.page-masthead {
  background: var(--ink);
  color: var(--bone);
  /* Top padding clears the transparent overlay nav that sits on this band. */
  padding: clamp(120px, 17vh, 210px) clamp(24px, 5vw, 56px) clamp(56px, 8vh, 112px);
  width: 100%;
}
.page-masthead-inner {
  max-width: 1120px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: end;
  gap: 32px 48px;
}
.page-masthead h1 {
  font-family: var(--f-display);
  font-weight: 300;
  font-size: clamp(64px, 11vw, 148px);
  letter-spacing: -0.03em;
  line-height: 0.95;
  color: var(--bone);
  margin: 0;
  text-wrap: balance;
}
@media (max-width: 720px) {
  .page-masthead-inner {
    grid-template-columns: 1fr;
    align-items: start;
    gap: 32px;
  }
}

/* Disclosure card — only on pages carrying no affiliate content */
.page-masthead-disclosure {
  background: var(--bone-2);
  border-left: 2px solid var(--moss);
  border-radius: 0 var(--r-inner) var(--r-inner) 0;
  padding: 16px 22px;
  min-width: 200px;
  max-width: 280px;
  align-self: end;
}
.page-masthead-disclosure .label {
  display: block;
  font-family: var(--f-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--moss);
  font-weight: 500;
  margin: 0 0 8px;
}
.page-masthead-disclosure .lines {
  font-family: var(--f-sans);
  font-size: 14px;
  line-height: 1.5;
  color: var(--ink-2);
  margin: 0;
}
.page-masthead-disclosure .lines .row { display: block; }

/* ============================================================
   PROSE COLUMN — the standard editorial body
   ============================================================ */
.prose {
  max-width: 780px;
  margin: 0 auto;
  padding: clamp(48px, 8vh, 88px) var(--gutter) 0;
}
.prose p {
  font-size: var(--t-body);
  line-height: 1.65;
  color: var(--ink-2);
  margin: 0 0 1.1em;
  text-wrap: pretty;
}
.prose p strong { color: var(--ink); font-weight: 500; }
.prose a:not(.btn) {
  color: var(--copper);
  background-image: linear-gradient(currentColor, currentColor);
  background-repeat: no-repeat;
  background-position: 0 100%;
  background-size: 0 1px;
  transition: background-size .3s var(--ease-quiet);
}
.prose a:not(.btn):hover,
.prose a:not(.btn):focus { background-size: 100% 1px; }

/* ============================================================
   REFERENCE CHIPS — FTC substantiation trail
   ============================================================ */
sup.ref, .ref {
  font-family: var(--f-mono);
  font-size: 10px;
  letter-spacing: 0.04em;
  color: var(--ink-3);
  line-height: 0;
  top: -0.35em;
  position: relative;
  padding: 0 2px;
  border-bottom: 1px dotted var(--ink-3);
  transition: color .15s var(--ease-quiet), border-color .15s var(--ease-quiet);
  white-space: nowrap;
}
sup.ref a { color: inherit; }
sup.ref:hover, sup.ref:focus-within,
.ref:hover, .ref:focus-within {
  color: var(--oxide);
  border-bottom-color: var(--oxide);
}

/* Reference tooltip — rendered by /static/refs.js */
.ref-tooltip {
  position: fixed;
  z-index: 1000;
  max-width: 340px;
  padding: 12px 14px;
  background: var(--bone);
  color: var(--ink-2);
  border: 1px solid var(--hairline);
  border-radius: var(--r-inner);
  box-shadow: 0 12px 32px -8px rgba(20, 31, 26, .22),
              0 4px 12px -4px rgba(20, 31, 26, .14);
  font-family: var(--f-sans);
  font-size: 13px;
  line-height: 1.55;
  display: none;
  opacity: 0;
  transform: translateY(4px);
  transition: opacity .18s var(--ease-quiet), transform .18s var(--ease-quiet);
}
.ref-tooltip.is-open { display: block; opacity: 1; transform: none; }
.ref-tooltip[data-placement="below"] { transform: translateY(-4px); }
.ref-tooltip[data-placement="below"].is-open { transform: none; }
.ref-tooltip-body { color: var(--ink-2); }
.ref-tooltip-link {
  display: inline-block;
  margin-left: 4px;
  color: var(--copper);
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  border-bottom: 1px solid rgba(180, 138, 92, .4);
  padding-bottom: 1px;
  white-space: nowrap;
  transition: border-color .15s var(--ease-quiet);
}
.ref-tooltip-link:hover { border-bottom-color: var(--copper); color: var(--ink); }
.ref-tooltip-empty { color: var(--ink-3); font-style: italic; }

/* ============================================================
   TAG SYSTEM — Compliance Brief §1.3. Two tags only.
   ============================================================ */
.tag {
  display: inline-block;
  font-family: var(--f-mono);
  font-size: 9px;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 3px 7px;
  border-radius: var(--r-inner);
  background: var(--ink);
  color: var(--bone);
  vertical-align: 1px;
}
.tag--affiliate {
  background: var(--oxide);
  color: var(--bone);
}

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 14px 28px;
  border: 1px solid var(--ink);
  border-radius: var(--r-pill);
  font-size: 14px;
  font-weight: 500;
  color: var(--ink);
  background: transparent;
  transition: background .3s var(--ease-quiet), color .3s var(--ease-quiet);
}
.btn:hover { background: var(--ink); color: var(--bone); }
.btn-solid { background: var(--ink); color: var(--bone); }
.btn-solid:hover { background: transparent; color: var(--ink); }

/* ============================================================
   REUSABLE
   ============================================================ */
.container { padding: 0 var(--gutter); }
.section { padding: var(--section-y) var(--gutter); }
.rule { height: 1px; background: var(--hairline); border: 0; margin: 0; }

/* Scroll reveal — only hides when JS is on; above-fold reveals instantly */
.js-motion .reveal:not(.in) { opacity: 0; transform: translateY(16px); }
.js-motion .reveal { transition: opacity .7s var(--ease-quiet), transform .7s var(--ease-quiet); }
.js-motion .reveal.in { opacity: 1; transform: none; }
.reveal { opacity: 1; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .js-motion .reveal { opacity: 1 !important; transform: none !important; transition: none !important; }
}