/** ═════════════════════════════════════════════════════════════════════
   PULSE About — "the philosophy page"
   A centered, editorial page in the v3 instrument language: a mono eyebrow,
   a quiet display headline, a calm two-paragraph mission block, and a
   responsive grid of bordered principle cards (each a cyan stroked SVG
   glyph + title + one-line body). Closes with a quiet "who's behind it"
   line and a row of related links.

   No pricing, no cost language, no fabricated facts — purely the product's
   stance. Scoped under .about-page. Depends on shared.css + tokens-v3.css
   + bg.css. Token-based only, centered ~860px.
   ═════════════════════════════════════════════════════════════════════ */

.about-page {
  font-family: var(--font-display);
  background: var(--ink-0);
  color: var(--text-1);
  line-height: var(--lead-body);
}

.about-page main {
  position: relative;
  z-index: var(--z-content);
  max-width: 860px;
  margin: 0 auto;
  padding: clamp(112px, 14vh, 144px) var(--sp-6) var(--sp-8);
}

/* Visually-hidden section labels (kept in the a11y outline) */
.about-page .sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  border: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
}

/* ── Header ─────────────────────────────────────────────────────────── */
.about-page .about-head {
  text-align: center;
  margin: 0 auto var(--sp-8);
  max-width: 60ch;
}
.about-page .eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: var(--track-eyebrow);
  color: var(--c-500);
  margin: 0 0 var(--sp-4);
}
.about-page h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  letter-spacing: var(--track-mega);
  line-height: 1.05;
  margin: 0 0 var(--sp-3);
  color: var(--text-1);
}
.about-page .sub {
  color: var(--text-2);
  font-size: var(--tx-sm);
  margin: 0 auto;
  max-width: 54ch;
  line-height: var(--lead-body);
}

/* ── Mission prose ──────────────────────────────────────────────────── */
.about-page .mission {
  text-align: center;
  max-width: 60ch;
  margin: 0 auto var(--sp-8);
}
.about-page .mission p {
  color: var(--text-2);
  font-size: var(--tx-base);
  line-height: var(--lead-body);
  margin: 0 0 var(--sp-4);
}
.about-page .mission p:last-child {
  margin-bottom: 0;
}

/* ── Principles grid ────────────────────────────────────────────────── */
.about-page .principles {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--sp-4);
  margin: 0 auto var(--sp-8);
}
.about-page .principle-card {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: var(--sp-6) var(--sp-5);
  border: 1px solid var(--line-2);
  border-radius: var(--r-3);
  background: oklch(0.08 0.006 250 / 0.4);
  box-shadow: var(--shadow-1), var(--inner-bevel);
  transition: border-color var(--dur-2) var(--ease-out-quart),
              transform var(--dur-2) var(--ease-out-quart);
}
.about-page .principle-card:hover {
  border-color: var(--line-accent);
  transform: translateY(-2px);
}
.about-page .principle-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  margin-bottom: var(--sp-4);
  border-radius: var(--r-2);
  border: 1px solid var(--line-accent);
  background: oklch(0.78 0.16 184 / 0.08);
  color: var(--c-500);
}
.about-page .principle-icon svg {
  width: 22px;
  height: 22px;
  display: block;
}
.about-page .principle-card h2 {
  margin: 0 0 var(--sp-2);
  font-family: var(--font-display);
  font-size: var(--tx-lg);
  font-weight: 700;
  letter-spacing: var(--track-tight);
  color: var(--text-1);
}
.about-page .principle-card p {
  margin: 0;
  color: var(--text-2);
  font-size: var(--tx-sm);
  line-height: var(--lead-body);
}

/* ── "Who's behind it" ──────────────────────────────────────────────── */
.about-page .behind {
  text-align: center;
  max-width: 56ch;
  margin: 0 auto var(--sp-8);
}
.about-page .behind h2 {
  font-family: var(--font-mono);
  font-size: var(--tx-2xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: var(--track-eyebrow);
  color: var(--text-2);
  margin: 0 0 var(--sp-3);
}
.about-page .behind p {
  color: var(--text-2);
  font-size: var(--tx-base);
  line-height: var(--lead-body);
  margin: 0;
}
.about-page .behind a {
  color: var(--c-500);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur-2) var(--ease-out-quart);
}
.about-page .behind a:hover {
  border-bottom-color: var(--c-500);
}

/* ── Quiet related links ────────────────────────────────────────────── */
.about-page .more-links {
  margin: 0 auto;
  text-align: center;
}
.about-page .more-links .more-label {
  font-family: var(--font-mono);
  font-size: var(--tx-2xs);
  text-transform: uppercase;
  letter-spacing: var(--track-eyebrow);
  color: var(--text-2);
  margin: 0 0 var(--sp-3);
}
.about-page .more-links nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--sp-2) var(--sp-5);
}
.about-page .more-links a {
  color: var(--text-2);
  font-size: var(--tx-sm);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur-2) var(--ease-out-quart),
              border-color var(--dur-2) var(--ease-out-quart);
}
.about-page .more-links a:hover {
  color: var(--c-500);
  border-bottom-color: var(--c-500);
}

/* ── Footer ─────────────────────────────────────────────────────────── */
.about-page footer {
  max-width: 860px;
  margin: 0 auto;
  padding: var(--sp-7) var(--sp-6) var(--sp-9);
  color: var(--text-2);
  font-size: var(--tx-xs);
  text-align: center;
  position: relative;
  z-index: var(--z-content);
  line-height: var(--lead-body);
}
.about-page footer a { color: var(--c-500); text-decoration: none; }
.about-page footer a:hover { text-decoration: underline; }

/* ── Light-mode surfaces ────────────────────────────────────────────── */
[data-theme="light"] .about-page .principle-card { background: oklch(0.99 0.003 250 / 0.7); }
[data-theme="light"] .about-page .principle-icon { background: oklch(0.78 0.16 184 / 0.12); }
[data-theme="light"] .about-page .eyebrow,
[data-theme="light"] .about-page .principle-icon,
[data-theme="light"] .about-page .behind a,
[data-theme="light"] .about-page .more-links a:hover,
[data-theme="light"] .about-page footer a { color: var(--c-800); }
[data-theme="light"] .about-page .behind a:hover,
[data-theme="light"] .about-page .more-links a:hover { border-bottom-color: var(--c-800); }