/* =========================================================================
   Benefactor Intelligence ... styles.css
   v3-aligned. Brand Guide v3.0, May 2026.
   ========================================================================= */

/* -- Tokens ---------------------------------------------------------------- */

:root {
  /* Color: foundation */
  --ink: #0E1116;
  --ink-soft: #1A1F26;
  --bone: #F4F0E8;
  --bone-deep: #E8E2D4;
  --paper: #FBF8F2;
  --steel: #5A6470;
  --steel-light: #9CA4AD;
  --rule: #C9C2B2;
  --rule-soft: #DED7C6;

  /* Color: reserved accents */
  --oxblood: #5C1A1B;
  --amber: #C8881C;
  --amber-soft: #E2A845;

  /* Type families */
  --serif: "Source Serif 4", Georgia, serif;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  --mono: "JetBrains Mono", "SF Mono", Consolas, monospace;

  /* Type sizes (fixed seven) */
  --t-cover: clamp(4rem, 9vw, 8.25rem);
  --t-display: clamp(2.25rem, 4vw, 3.5rem);
  --t-sub: 1.75rem;
  --t-lede: 1.5rem;
  --t-body: 1rem;
  --t-eyebrow: 0.6875rem;
  --t-meta: 0.625rem;

  /* Leading */
  --leading-cover: 0.9;
  --leading-display: 1.0;
  --leading-sub: 1.15;
  --leading-lede: 1.38;
  --leading-body: 1.58;
  --leading-eyebrow: 1.4;
  --leading-meta: 1.6;

  /* Tracking */
  --tracking-display: -0.025em;
  --tracking-stamp: 0.18em;

  /* Spacing */
  --space-page-x: clamp(1.5rem, 6vw, 5rem);
  --space-section: clamp(4rem, 8vw, 8rem);
  --space-block: clamp(2rem, 4vw, 4rem);
  --max-w: 1120px;
}

/* -- Reset ----------------------------------------------------------------- */

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body { margin: 0; }
img, picture, svg { display: block; max-width: 100%; }
button { font: inherit; background: none; border: 0; padding: 0; cursor: pointer; color: inherit; }
ul, ol { padding: 0; margin: 0; list-style: none; }
p { margin: 0; }
h1, h2, h3, h4, h5, h6 { margin: 0; font-weight: inherit; }
a { color: inherit; text-decoration: none; }

/* -- Base ------------------------------------------------------------------ */

body {
  font-family: var(--sans);
  font-size: var(--t-body);
  line-height: var(--leading-body);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

::selection { background-color: var(--amber); color: var(--ink); }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* -- Skip link & focus ----------------------------------------------------- */

.skip-link {
  position: absolute;
  left: 0; top: 0;
  padding: 0.75rem 1rem;
  background-color: var(--ink);
  color: var(--bone);
  transform: translateY(-110%);
  transition: transform 0.18s ease;
  z-index: 100;
  font-family: var(--sans);
  font-size: 0.875rem;
}
.skip-link:focus { transform: translateY(0); }

a:focus-visible,
button:focus-visible,
.cta:focus-visible {
  outline: 2px solid currentColor;
  outline-offset: 3px;
}

/* -- Surfaces -------------------------------------------------------------- */

body.surface-bone { background-color: var(--bone); color: var(--ink); }
body.surface-ink  { background-color: var(--ink);  color: var(--bone); }

.panel-bone     { background-color: var(--bone);     color: var(--ink); }
.panel-ink-soft { background-color: var(--ink-soft); color: var(--bone); }

/* -- Type utilities (the seven) -------------------------------------------- */

.t-cover {
  font-family: var(--serif);
  font-weight: 300;
  font-size: var(--t-cover);
  line-height: var(--leading-cover);
  letter-spacing: -0.01em;
}
.t-display {
  font-family: var(--serif);
  font-weight: 400;
  font-size: var(--t-display);
  line-height: var(--leading-display);
  letter-spacing: var(--tracking-display);
}
.t-sub {
  font-family: var(--serif);
  font-weight: 500;
  font-size: var(--t-sub);
  line-height: var(--leading-sub);
}
.t-lede {
  font-family: var(--serif);
  font-weight: 300;
  font-size: var(--t-lede);
  line-height: var(--leading-lede);
}
.t-body {
  font-family: var(--sans);
  font-weight: 400;
  font-size: var(--t-body);
  line-height: var(--leading-body);
}
.t-eyebrow {
  font-family: var(--sans);
  font-weight: 700;
  font-size: var(--t-eyebrow);
  line-height: var(--leading-eyebrow);
  letter-spacing: var(--tracking-stamp);
  text-transform: uppercase;
}
.t-meta {
  font-family: var(--mono);
  font-weight: 500;
  font-size: var(--t-meta);
  line-height: var(--leading-meta);
  letter-spacing: var(--tracking-stamp);
  text-transform: uppercase;
}

/* -- Layout primitives ----------------------------------------------------- */

.container {
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: var(--space-page-x);
}

.section {
  padding-block: var(--space-section);
}
.section--tight { padding-block: var(--space-block); }

.hairline {
  border: 0;
  height: 1px;
  background-color: var(--rule);
  margin: 0;
}
body.surface-ink .hairline { background-color: var(--ink-soft); }

.divider-top    { border-top: 1px solid var(--rule); }
.divider-bottom { border-bottom: 1px solid var(--rule); }
body.surface-ink .divider-top    { border-top-color: var(--ink-soft); }
body.surface-ink .divider-bottom { border-bottom-color: var(--ink-soft); }

/* -- Meta-bar (top of every page) ----------------------------------------- */

.meta-bar {
  padding: 1rem var(--space-page-x);
  border-bottom: 1px solid var(--rule);
  color: var(--steel);
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}
body.surface-ink .meta-bar {
  border-bottom-color: var(--ink-soft);
  color: var(--steel-light);
}

/* -- Site header & nav ----------------------------------------------------- */

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  padding: 2rem var(--space-page-x);
}

.nav {
  display: flex;
  align-items: center;
  gap: 2rem;
  flex-wrap: wrap;
}
.nav-link {
  font-family: var(--sans);
  font-size: 0.9375rem;
  font-weight: 400;
}
.nav-link:hover,
.nav-link:focus-visible {
  text-decoration: underline;
  text-underline-offset: 4px;
}

/* -- Logo lockup ----------------------------------------------------------- */

.lockup {
  display: inline-flex;
  align-items: center;
  gap: 0.6em;
  font-family: var(--serif);
  font-weight: 300;
  font-size: 1.125rem;
  color: inherit;
}
.lockup .mark {
  font-style: italic;
  border: 1px solid currentColor;
  padding: 0.05em 0.4em 0.1em;
  line-height: 1;
  font-size: 1em;
}

/* -- CTA ------------------------------------------------------------------- */

.cta {
  display: inline-block;
  font-family: var(--sans);
  font-weight: 500;
  font-size: 0.9375rem;
  text-decoration: none;
  padding: 0.85rem 1.5rem;
  border: 1px solid currentColor;
  background-color: transparent;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

body.surface-bone .cta:hover,
body.surface-bone .cta:focus-visible {
  background-color: var(--ink);
  color: var(--bone);
  border-color: var(--ink);
}
body.surface-ink .cta:hover,
body.surface-ink .cta:focus-visible {
  background-color: var(--bone);
  color: var(--ink);
  border-color: var(--bone);
}

/* -- Product accents (gated by class) ------------------------------------- */

.product-brief .accent-rule { background-color: var(--oxblood); }
.product-brief a:not(.lockup):not(.nav-link):not(.cta) { color: var(--oxblood); }
.product-brief .cta {
  border-color: var(--oxblood);
  color: var(--oxblood);
}
.product-brief .cta:hover,
.product-brief .cta:focus-visible {
  background-color: var(--oxblood);
  color: var(--bone);
  border-color: var(--oxblood);
}

.product-signal .accent-rule { background-color: var(--amber); }
.product-signal a:not(.lockup):not(.nav-link):not(.cta) { color: var(--amber); }
.product-signal .cta {
  border-color: var(--amber);
  color: var(--amber);
}
.product-signal .cta:hover,
.product-signal .cta:focus-visible {
  background-color: var(--amber);
  color: var(--ink);
  border-color: var(--amber);
}

/* -- Hero ------------------------------------------------------------------ */

.hero {
  padding-block: clamp(4rem, 12vw, 10rem) var(--space-section);
}
.hero-eyebrow {
  margin-bottom: 2rem;
  color: var(--steel-light);
}
.hero-headline {
  margin-bottom: 2rem;
  max-width: 16ch;
}
.hero-accent {
  font-style: italic;
  color: var(--amber);
}
.hero-lede {
  margin-bottom: 1rem;
  max-width: 36ch;
}
.hero-support {
  max-width: 56ch;
  margin-bottom: 2.5rem;
  color: var(--steel-light);
}
body.surface-bone .hero-support { color: var(--steel); }

/* -- Lede pull ------------------------------------------------------------- */

.pull {
  max-width: 44ch;
  padding-block: var(--space-block);
}

/* -- Audience-entry panels ------------------------------------------------- */

.audience-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 3rem;
  margin-top: var(--space-block);
}
.audience-panel {
  border-top: 1px solid var(--rule);
  padding-top: 1.5rem;
}
body.surface-ink .audience-panel { border-top-color: var(--ink-soft); }
.audience-eyebrow { margin-bottom: 1.5rem; color: var(--steel-light); }
body.surface-bone .audience-eyebrow { color: var(--steel); }
.audience-quote {
  margin-bottom: 1rem;
  font-style: italic;
}
.audience-attribution {
  color: var(--steel);
  margin-bottom: 1.25rem;
}
body.surface-ink .audience-attribution { color: var(--steel-light); }
.audience-response { margin-bottom: 0.5rem; }
.audience-guardrail {
  margin-top: 0.75rem;
  color: var(--steel-light);
  font-size: 0.9375rem;
}

/* -- Combined-system product panels (home) -------------------------------- */

.system-grid {
  display: grid;
  grid-template-columns: 1fr 1px 1fr;
  gap: 3rem;
  align-items: stretch;
}
.system-grid > .system-rule {
  background-color: var(--rule);
  width: 1px;
}
body.surface-ink .system-grid > .system-rule { background-color: var(--ink-soft); }

.system-panel {
  padding: var(--space-block);
}
.system-panel h3 { margin-bottom: 1rem; }
.system-panel .system-tagline { margin-bottom: 1rem; color: var(--steel); }
.product-signal .system-panel .system-tagline,
body.surface-ink .system-panel .system-tagline { color: var(--steel-light); }
.system-panel-link {
  margin-top: 1.5rem;
  display: inline-block;
  font-weight: 500;
  border-bottom: 1px solid currentColor;
  padding-bottom: 0.15rem;
}

/* -- Together statement ---------------------------------------------------- */

.together {
  max-width: 32ch;
}

/* -- Category claim -------------------------------------------------------- */

.category-claim {
  max-width: 36ch;
  font-style: italic;
}

/* -- "How this fits" objection block -------------------------------------- */

.fits-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2.5rem;
  margin-top: var(--space-block);
}
.fits-item h3 { margin-bottom: 0.75rem; }

/* -- "What this is not" mono lines ---------------------------------------- */

.not-list {
  margin-top: var(--space-block);
  border-top: 1px solid var(--rule);
}
body.surface-ink .not-list { border-top-color: var(--ink-soft); }
.not-list li {
  font-family: var(--mono);
  font-weight: 500;
  font-size: var(--t-meta);
  line-height: var(--leading-meta);
  letter-spacing: var(--tracking-stamp);
  text-transform: uppercase;
  padding: 1rem 0;
  border-bottom: 1px solid var(--rule);
  color: var(--steel);
}
body.surface-ink .not-list li {
  border-bottom-color: var(--ink-soft);
  color: var(--steel-light);
}

/* -- Brief: "What it includes" -------------------------------------------- */

.includes-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem 3rem;
  margin-top: var(--space-block);
}
.includes-grid li {
  padding-block: 0.75rem;
  border-top: 1px solid var(--rule);
}

/* -- Brief: "What it helps you understand" -------------------------------- */

.understand-list {
  margin-top: var(--space-block);
  max-width: 56ch;
}
.understand-list li {
  font-family: var(--serif);
  font-weight: 400;
  font-size: 1.5rem;
  line-height: 1.38;
  padding: 1.25rem 0;
  border-top: 1px solid var(--rule);
}
.understand-list li:last-child { border-bottom: 1px solid var(--rule); }

/* -- Brief: differentiator stack ------------------------------------------ */

.differentiator {
  max-width: 44ch;
  margin-top: var(--space-block);
}
.differentiator p {
  font-family: var(--serif);
  font-weight: 400;
  font-size: 1.75rem;
  line-height: 1.3;
}
.differentiator p + p { margin-top: 1rem; }

/* -- Brief: sample cover treatment ---------------------------------------- */

.brief-cover {
  background-color: var(--paper);
  border: 1px solid var(--rule);
  padding: clamp(2rem, 4vw, 4rem);
  max-width: 480px;
  margin-top: var(--space-block);
}
.brief-cover .accent-rule {
  height: 2px;
  margin: 2rem 0;
}
.brief-cover .brief-id {
  font-family: var(--mono);
  font-size: var(--t-meta);
  letter-spacing: var(--tracking-stamp);
  text-transform: uppercase;
  color: var(--steel);
  margin-bottom: 1rem;
}
.brief-cover .brief-title {
  font-family: var(--serif);
  font-weight: 400;
  font-size: 2rem;
  line-height: 1.1;
  margin-bottom: 2rem;
}
.brief-cover .brief-prepared {
  font-family: var(--mono);
  font-size: var(--t-meta);
  letter-spacing: var(--tracking-stamp);
  text-transform: uppercase;
  color: var(--steel);
}

/* -- Signal: vector grid --------------------------------------------------- */

.vector-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 1rem 2rem;
  margin-top: var(--space-block);
}
.vector-label {
  font-family: var(--mono);
  font-weight: 500;
  font-size: var(--t-meta);
  letter-spacing: var(--tracking-stamp);
  text-transform: uppercase;
  color: var(--steel-light);
  padding-block: 0.6rem;
  border-top: 1px solid var(--ink-soft);
  transition: color 0.2s ease;
}
.vector-label:hover { color: var(--amber); }

/* -- Signal: sample alert card -------------------------------------------- */

.signal-alert {
  background-color: var(--ink-soft);
  border-left: 2px solid var(--amber);
  padding: clamp(1.5rem, 3vw, 2.5rem);
  max-width: 640px;
  margin-top: var(--space-block);
}
.signal-alert .signal-meta {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
  font-family: var(--mono);
  font-size: var(--t-meta);
  letter-spacing: var(--tracking-stamp);
  text-transform: uppercase;
  color: var(--steel-light);
  margin-bottom: 1rem;
}
.signal-alert h3 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: 1.5rem;
  line-height: 1.25;
  margin-bottom: 1rem;
}
.signal-alert .signal-section {
  margin-top: 1.25rem;
}
.signal-alert .signal-section-label {
  font-family: var(--sans);
  font-weight: 700;
  font-size: var(--t-eyebrow);
  letter-spacing: var(--tracking-stamp);
  text-transform: uppercase;
  color: var(--amber);
  margin-bottom: 0.5rem;
}

/* -- Q&A block (Signal "what it answers") --------------------------------- */

.qa-list {
  display: grid;
  gap: 1.5rem;
  margin-top: var(--space-block);
}
.qa-list li {
  font-family: var(--serif);
  font-weight: 400;
  font-size: 1.5rem;
  line-height: 1.38;
  border-top: 1px solid var(--ink-soft);
  padding-top: 1rem;
}

/* -- Footer ---------------------------------------------------------------- */

.site-footer {
  margin-top: var(--space-section);
  padding: var(--space-block) var(--space-page-x) 2rem;
  border-top: 1px solid var(--rule);
}
body.surface-ink .site-footer { border-top-color: var(--ink-soft); }

.site-footer-row {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 2rem;
  flex-wrap: wrap;
}
.site-footer-row a { font-family: var(--sans); }
.site-footer-tagline {
  font-family: var(--serif);
  font-style: italic;
  font-size: 1.125rem;
  color: var(--steel);
}
body.surface-ink .site-footer-tagline { color: var(--steel-light); }

.site-footer-copy {
  margin-top: 1.5rem;
  font-family: var(--mono);
  font-size: var(--t-meta);
  letter-spacing: var(--tracking-stamp);
  text-transform: uppercase;
  color: var(--steel);
}
body.surface-ink .site-footer-copy { color: var(--steel-light); }

/* -- Responsive ------------------------------------------------------------ */

@media (max-width: 960px) {
  .audience-grid,
  .fits-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
  .system-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
  .system-grid > .system-rule {
    width: 100%;
    height: 1px;
  }
  .includes-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .site-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 1.5rem;
  }
  .nav { gap: 1.25rem; }
  .meta-bar { font-size: 0.55rem; }
}