/* /about — page-scoped styles. Base tokens/components come from ../styles.css. */

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

.hx-hero { padding-top: clamp(44px, 7vw, 82px); padding-bottom: 34px; }
.hx-hero h1 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(38px, 6vw, 64px);
  letter-spacing: -0.028em;
  line-height: 1.04;
  margin: 12px 0 0;
}
.hx-dek { font-size: clamp(16.5px, 2vw, 19px); line-height: 1.6; color: var(--muted); max-width: 58ch; margin: 18px 0 0; }

.hx-chips { display: flex; flex-wrap: wrap; gap: 6px; margin: 20px 0 0; padding: 0; list-style: none; }
.hx-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 28px;
  padding: 5px 9px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: var(--card);
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}

.hx-h2 { font-family: var(--serif); font-weight: 600; font-size: clamp(26px, 3.4vw, 38px); letter-spacing: -0.022em; line-height: 1.1; margin: 0 0 10px; }

.hx-stage-k {
  display: block;
  font-family: var(--mono);
  font-size: 8.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--faint);
  margin: 0 0 7px;
}
.hx-stage-h { font-family: var(--serif); font-size: 22px; font-weight: 600; letter-spacing: -0.015em; line-height: 1.18; margin: 0 0 7px; }
.hx-stage-p { margin: 0; color: #3a3a40; font-size: 15px; line-height: 1.65; max-width: 58ch; }

.hx-flow { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: minmax(0, 1fr); gap: 12px; }
.hx-step { position: relative; color: var(--ink); background: var(--card); border: 1px solid var(--line); border-radius: var(--r); padding: 20px 20px 18px; }
.hx-step-k { display: flex; align-items: baseline; gap: 7px; font-family: var(--mono); font-size: 8.5px; letter-spacing: 0.09em; text-transform: uppercase; color: var(--faint); margin: 0; }
.hx-step-k b { color: var(--accent); font-weight: 400; font-size: 11px; }
.hx-step h3 { font-family: var(--serif); font-size: 20px; font-weight: 600; letter-spacing: -0.015em; line-height: 1.18; margin: 9px 0 8px; }
.hx-step p { margin: 0; color: #3a3a40; font-size: 14px; line-height: 1.6; }
.hx-axes { display: flex; align-items: flex-end; gap: 4px; margin: 14px 0 0; }
.hx-axes i { display: block; width: 7px; background: var(--accent); border-radius: 2px; opacity: 0.28; }
.hx-axes i:nth-child(1) { height: 12px; }
.hx-axes i:nth-child(2) { height: 18px; }
.hx-axes i:nth-child(3) { height: 14px; }
.hx-axes i:nth-child(4) { height: 21px; }
.hx-axes i:nth-child(5) { height: 16px; }
.hx-axes i:nth-child(6) { height: 11px; }
.hx-axes i:nth-child(7) { height: 19px; }
.hx-axes i:last-child { opacity: 1; }
.hx-axes-k { font-family: var(--mono); font-size: 8.5px; letter-spacing: 0.07em; text-transform: uppercase; color: var(--faint); margin: 6px 0 0; }
.hx-duo { display: flex; flex-wrap: wrap; gap: 5px; margin: 14px 0 0; }
.hx-duo span,
.hx-file {
  display: inline-block;
  padding: 3px 7px;
  border: 1px solid var(--line);
  border-radius: 5px;
  background: var(--paper);
  font-family: var(--mono);
  font-size: 8.5px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--muted);
}
.hx-file { display: inline-block; margin-top: 14px; color: var(--accent); border-color: #d5dcf7; background: var(--accent-soft); }

.hx-pgrid { display: grid; grid-template-columns: minmax(0, 1fr); gap: 12px; }
.hx-p { background: var(--card); border: 1px solid var(--line); border-radius: var(--r); padding: 18px 19px 16px; }
.hx-p .n { font-family: var(--mono); font-size: 9px; letter-spacing: 0.09em; color: var(--accent); }
.hx-p h3 { font-family: var(--serif); font-size: 19px; font-weight: 600; letter-spacing: -0.012em; margin: 7px 0 6px; }
.hx-p p { margin: 0; font-size: 14px; line-height: 1.6; color: #3a3a40; }

.hx-quote { background: var(--dark); color: var(--on-dark); border-radius: var(--r-lg); padding: 24px 24px 20px; }
.hx-quote .k { font-family: var(--mono); font-size: 9px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--dark-muted); margin: 0 0 12px; }
.hx-quote p { font-family: var(--serif); font-size: 19px; line-height: 1.58; margin: 0 0 14px; }
.hx-quote p:last-of-type { margin-bottom: 0; }
.hx-quote .sig { font-family: var(--mono); font-size: 9px; letter-spacing: 0.09em; text-transform: uppercase; color: var(--dark-muted); margin-top: 16px; }

.hx-fine { border: 1px dashed var(--line); border-radius: var(--r); padding: 18px 20px 16px; background: #fcfcfb; }
.hx-fine .k { font-family: var(--mono); font-size: 9px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); margin: 0 0 8px; }
.hx-fine ul { margin: 0; padding-left: 16px; columns: 1; }
.hx-fine li { font-size: 13.5px; line-height: 1.6; color: var(--muted); margin: 0 0 4px; }
@media (min-width: 720px) { .hx-fine ul { columns: 2; column-gap: 28px; } }

.hx-faq-list { display: grid; grid-template-columns: minmax(0, 1fr); gap: 0; margin: 22px 0 0; }
.hx-qa { border-top: 1px solid var(--line); padding: 16px 0 18px; }
.hx-qa h3 { font-family: var(--serif); font-size: 18px; font-weight: 600; letter-spacing: -0.012em; margin: 0 0 6px; }
.hx-qa p { margin: 0; font-size: 14.5px; line-height: 1.62; color: #3a3a40; max-width: 72ch; }

.hx-cta { background: var(--dark); color: var(--on-dark); padding: 46px 0 52px; }
.hx-cta a:focus-visible { outline-color: var(--on-dark); }
.hx-cta-in { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 20px; }
.hx-cta h2 { font-family: var(--serif); font-weight: 600; font-size: clamp(25px, 3.4vw, 36px); letter-spacing: -0.02em; margin: 0; }
.hx-cta p { color: var(--dark-muted); margin: 7px 0 0; font-size: 14px; max-width: 48ch; }
.hx-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 18px; }
.hx-bloglink {
  color: var(--on-dark);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border-bottom: 1px solid #4a4851;
  padding-bottom: 2px;
}
.hx-bloglink:hover { border-bottom-color: var(--on-dark); }

@media (max-width: 430px) {
  .hx-hero { padding-top: 36px; }
  .hx-hero h1 { font-size: 36px; }
  .hx-actions { width: 100%; }
  .hx-actions .btn { width: 100%; }
}

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

/* V3 split-rail layout */
.h3-hero { padding-top: clamp(42px, 6vw, 74px); padding-bottom: 24px; }
.h3-hero h1 { font-size: clamp(36px, 6vw, 62px); }
.h3-shell { display: grid; grid-template-columns: minmax(0, 1fr); gap: 26px; padding-top: 18px; padding-bottom: 50px; }
.h3-rail { border: 1px solid var(--line); border-radius: var(--r); background: var(--card); padding: 14px 16px; align-self: start; }
.h3-rail .k { font-family: var(--mono); font-size: 8.5px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--faint); margin: 0 0 8px; }
.h3-rail nav { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 2px 14px; }
.h3-rail a { display: block; padding: 6px 0 6px 9px; border-left: 2px solid transparent; color: var(--muted); }
.h3-rail a:hover { color: var(--ink); }
.h3-rail a.is-active { border-left-color: var(--accent); color: var(--accent); }
.h3-rail a .s { display: block; font-family: var(--mono); font-size: 8px; letter-spacing: 0.07em; text-transform: uppercase; color: var(--faint); }
.h3-rail a .t { display: block; font-size: 12.5px; line-height: 1.35; margin-top: 1px; }
.h3-rail .btn { margin-top: 12px; min-height: 40px; padding: 9px 12px; font-size: 9.5px; }
.h3-main { min-width: 0; }
.h3-sec { padding: 24px 0 26px; border-top: 1px solid var(--line); scroll-margin-top: 88px; }
.h3-sec:first-child { border-top: 0; padding-top: 0; }
.h3-panel { border: 1px solid var(--line); border-top: 4px solid var(--accent); border-radius: var(--r-lg); background: #fcfcfb; padding: clamp(20px, 3.2vw, 30px); margin: 26px 0 28px; scroll-margin-top: 88px; }
.h3-panel .hx-flow { margin-top: 20px; }
.h3-panel .hx-step { background: var(--card); }
.h3-panel-head { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 6px 20px; }
.h3-panel-head .k { font-family: var(--mono); font-size: 9px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--accent); margin: 0; }
.h3-panel-head p { margin: 0; color: var(--muted); font-size: 13px; }
.h3-principles { border-top: 1px solid var(--line); padding: 30px 0 34px; scroll-margin-top: 88px; }
.h3-pgrid { margin-top: 18px; }
.h3-founder { border-top: 1px solid var(--line); padding: 30px 0 34px; scroll-margin-top: 88px; }
.h3-founder .hx-quote { margin-top: 16px; }
.h3-founder .hx-fine { margin-top: 18px; }
.h3-faq { border-top: 1px solid var(--line); padding: 30px 0 34px; scroll-margin-top: 88px; }
.h3-faq .hx-faq-list { margin-top: 16px; }

@media (min-width: 640px) {
  .h3-panel .hx-flow { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .h3-pgrid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 900px) {
  .h3-shell { grid-template-columns: 224px minmax(0, 1fr); gap: 46px; }
  .h3-rail { position: sticky; top: 88px; }
  .h3-rail nav { grid-template-columns: minmax(0, 1fr); gap: 0; }
}