/* Public site stylesheet. No framework, no build step — loaded directly.
   Mobile-first; see references/design-and-perf.md for the numeric rules
   this file implements (48px section gaps, 680-720px content width,
   16-18px/1.7 body text, 44x44 touch targets, transform/opacity-only
   animation under 200ms). */

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

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

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-body);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.7;
  overflow-x: hidden;
}

h1,
h2,
h3 {
  color: var(--color-ink);
  line-height: 1.35;
  margin: 0 0 var(--space-2);
}
h1 {
  font-size: clamp(1.6rem, 1.3rem + 1.2vw, 2.2rem);
  font-weight: 800;
}
h2 {
  font-size: 1.35rem;
  font-weight: 700;
  margin-top: var(--space-6);
}
h3 {
  font-size: 1.1rem;
  font-weight: 700;
}
p {
  margin: 0 0 var(--space-2);
}
ul,
ol {
  margin: 0 0 var(--space-2);
  padding-left: 1.3em;
}
a {
  color: var(--color-main-ink);
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}
a:hover {
  text-decoration-thickness: 2px;
}
img {
  max-width: 100%;
  height: auto;
}

:focus-visible {
  outline: 3px solid var(--color-main);
  outline-offset: 2px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  left: 0;
  top: -48px;
  background: var(--color-main);
  color: #fff;
  padding: var(--space-1) var(--space-2);
  z-index: 100;
  transition: top var(--motion-base) ease;
}
.skip-link:focus {
  top: 0;
}

/* ---------- Layout shell ---------- */
.site-header__inner,
.site-footer__inner,
main {
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: 0 var(--space-2);
}
main {
  padding-top: var(--space-3);
  padding-bottom: var(--space-8);
}
main > .breadcrumb + * {
  margin-top: var(--space-2);
}

/* Content-bearing elements (article body, page copy) stay within the
   680-720px reading width even though header/footer/grids use the wider shell. */
h1,
.page-lead,
.static-page__body,
.post__header,
.post__body,
.info-box,
.faq,
.related,
.owner-box,
.content-note,
.toc,
.author-hub__bio,
.author-hub .principles-list,
.hero {
  max-width: var(--content-max);
}

/* ---------- Header / Nav ---------- */
.site-header {
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
}
.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  padding-top: var(--space-2);
  padding-bottom: var(--space-2);
  flex-wrap: wrap;
}
.site-header__brand {
  display: flex;
  flex-direction: column;
  color: var(--color-ink);
  text-decoration: none;
}
.site-header__name {
  font-weight: 800;
  font-size: 1.15rem;
}
.site-header__tagline {
  font-size: 0.8rem;
  color: var(--color-muted);
}
.nav__toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: var(--touch-target);
  height: var(--touch-target);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-ink);
  cursor: pointer;
}
.nav {
  flex-basis: 100%;
}
.nav__list {
  list-style: none;
  margin: var(--space-1) 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1) var(--space-3);
}
.nav__list a {
  display: inline-flex;
  align-items: center;
  min-height: var(--touch-target);
  color: var(--color-body);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
}
.nav__list a:hover,
.nav__link--active {
  color: var(--color-main-ink);
}

@media (max-width: 719px) {
  .nav.is-collapsed .nav__list {
    display: none;
  }
}

@media (min-width: 720px) {
  .nav__toggle {
    display: none;
  }
  .nav {
    flex-basis: auto;
  }
  .nav__list {
    margin-top: 0;
  }
}

/* ---------- Breadcrumb ---------- */
.breadcrumb ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  margin: 0;
  padding: 0;
  font-size: 0.85rem;
  color: var(--color-muted);
}
.breadcrumb a {
  color: var(--color-muted);
}
.breadcrumb__sep {
  color: var(--color-faint);
}

/* ---------- Hero ---------- */
.hero {
  padding: var(--space-4) 0 var(--space-2);
}
.hero__eyebrow {
  color: var(--color-main-ink);
  font-weight: 700;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: var(--space-1);
}
.hero__tagline {
  font-size: 1.05rem;
  color: var(--color-muted);
}

/* ---------- Sections ---------- */
.section {
  margin-top: var(--space-6);
}
.section--cta {
  background: var(--color-accent-bg);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  max-width: var(--content-max);
}
.page-lead {
  color: var(--color-muted);
  font-size: 1.05rem;
}

/* ---------- Category grid / tiles ---------- */
.category-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2);
}
@media (min-width: 640px) {
  .category-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .category-grid--full {
    grid-template-columns: repeat(3, 1fr);
  }
}
.category-tile {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  text-decoration: none;
  background: var(--color-surface);
  transition: border-color var(--motion-base) ease, transform var(--motion-base) ease;
}
.category-tile:hover {
  border-color: var(--color-main);
  transform: translateY(-2px);
}
.category-tile__name {
  font-weight: 700;
  color: var(--color-ink);
}
.category-tile__desc,
.category-tile__intro {
  color: var(--color-muted);
  font-size: 0.92rem;
}
.category-tile__count {
  font-size: 0.8rem;
  color: var(--color-faint);
}

/* ---------- Cards ---------- */
.card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
}
@media (min-width: 640px) {
  .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (min-width: 960px) {
  .card-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}
.card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  background: var(--color-surface);
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}
.card--column {
  border-color: var(--color-sub);
  background: linear-gradient(180deg, var(--color-accent-bg), var(--color-surface) 40%);
}
.card__meta {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  font-size: 0.78rem;
  color: var(--color-muted);
}
.card__badge {
  background: var(--color-accent-bg);
  color: var(--color-main-ink);
  border-radius: 999px;
  padding: 2px 10px;
  font-weight: 700;
  text-decoration: none;
}
.card__badge--column {
  background: var(--color-sub);
  color: #fff;
}
.card__title {
  margin: 0;
  font-size: 1.05rem;
}
.card__title a {
  color: var(--color-ink);
  text-decoration: none;
}
.card__title a:hover {
  color: var(--color-main-ink);
}
.card__summary {
  margin: 0;
  color: var(--color-body);
  font-size: 0.95rem;
}
.empty-note {
  color: var(--color-muted);
}

/* ---------- Principles / owner box ---------- */
.principles-list {
  padding-left: 1.1em;
}
.owner-box {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  background: var(--color-surface-alt);
}
.owner-box__eyebrow {
  font-size: 0.8rem;
  color: var(--color-muted);
  margin-bottom: 2px;
}
.owner-box__name a {
  font-weight: 800;
  font-size: 1.05rem;
  color: var(--color-ink);
  text-decoration: none;
}
.owner-box__bio {
  color: var(--color-body);
}
.owner-box__cta a {
  font-weight: 700;
}

/* ---------- Table of contents ---------- */
.toc {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-2) var(--space-3);
  background: var(--color-surface-alt);
  margin: var(--space-3) 0;
}
.toc__title {
  font-weight: 700;
  margin: 0 0 var(--space-1);
}
.toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.toc__item {
  padding: 2px 0;
}
.toc__item--h3 {
  padding-left: var(--space-2);
  font-size: 0.92rem;
}
.toc__item.is-active > a {
  color: var(--color-main-ink);
  font-weight: 700;
}

/* ---------- Post ---------- */
.post__header {
  margin-bottom: var(--space-2);
}
.post__category a {
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--color-main-ink);
  text-decoration: none;
}
.post__subtitle {
  color: var(--color-muted);
  font-size: 1.05rem;
}
.post__meta {
  font-size: 0.85rem;
  color: var(--color-faint);
  display: flex;
  gap: var(--space-1);
  flex-wrap: wrap;
}
.post__body h2:first-child {
  margin-top: 0;
}
.post--column .post__category {
  color: var(--color-sub);
}

/* ---------- Info boxes (takeaways / mistakes / checklist) ---------- */
.info-box {
  border-radius: var(--radius-md);
  padding: var(--space-3);
  margin-top: var(--space-4);
  border: 1px solid var(--color-border);
}
.info-box h2 {
  margin-top: 0;
}
.info-box--takeaways {
  background: var(--color-accent-bg);
  border-color: var(--color-main);
}
.info-box--mistakes {
  background: #fff7ed;
  border-color: #f59e0b;
}
.info-box--checklist {
  background: var(--color-surface-alt);
}
.info-box--checklist ul {
  list-style: none;
  padding-left: 0;
}
.info-box--checklist li::before {
  content: "\2610";
  margin-right: 8px;
  color: var(--color-muted);
}

/* ---------- FAQ ---------- */
.faq {
  margin-top: var(--space-4);
}
.faq__item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: var(--space-1) var(--space-2);
  margin-bottom: var(--space-1);
}
.faq__item summary {
  cursor: pointer;
  font-weight: 700;
  min-height: var(--touch-target);
  display: flex;
  align-items: center;
}
.faq__item p {
  margin: var(--space-1) 0 var(--space-1);
  color: var(--color-body);
}

/* ---------- Notes / related ---------- */
.content-note {
  margin-top: var(--space-3);
  font-size: 0.88rem;
  color: var(--color-muted);
  border-left: 3px solid var(--color-border-strong);
  padding-left: var(--space-2);
}
.related {
  margin-top: var(--space-6);
}
.related ul {
  list-style: none;
  padding: 0;
  display: grid;
  gap: var(--space-1);
}
.related li {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: var(--space-1) var(--space-2);
}
.related a {
  font-weight: 700;
  text-decoration: none;
}
.related__summary {
  display: block;
  font-size: 0.85rem;
  color: var(--color-muted);
}

/* ---------- Static pages / contact / not-found ---------- */
.static-page__body {
  color: var(--color-body);
}
.contact-box {
  max-width: var(--content-max);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  background: var(--color-accent-bg);
  margin-top: var(--space-3);
}
.contact-box__label {
  margin: 0 0 4px;
  font-weight: 700;
}
.contact-box__email {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--color-main-ink);
}
.not-found {
  padding: var(--space-6) 0;
}

/* ---------- Author hub ---------- */
.author-hub__banner {
  background: var(--color-surface-alt);
  border-radius: var(--radius-md);
  padding: var(--space-2) var(--space-3);
  margin: var(--space-2) 0 var(--space-4);
  max-width: var(--content-max);
}
.author-hub__visitor-note {
  margin: 0;
  color: var(--color-muted);
}
.author-hub__admin-cta {
  margin: var(--space-1) 0 0;
}
[data-role="admin-only"][hidden] {
  display: none;
}

/* ---------- HTML sitemap ---------- */
.html-sitemap__list {
  list-style: none;
  padding: 0;
  columns: 1;
}
@media (min-width: 640px) {
  .html-sitemap__list {
    columns: 2;
  }
}

/* ---------- Buttons ---------- */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: var(--touch-target);
  padding: 0 var(--space-3);
  background: var(--color-main);
  color: #fff;
  font-weight: 700;
  border-radius: var(--radius-sm);
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: opacity var(--motion-base) ease, transform var(--motion-base) ease;
}
.button:hover {
  opacity: 0.9;
}
.button:active {
  transform: scale(0.98);
}

/* ---------- Footer ---------- */
.site-footer {
  margin-top: var(--space-8);
  border-top: 1px solid var(--color-border);
  background: var(--color-surface-alt);
}
.site-footer__inner {
  padding-top: var(--space-4);
  padding-bottom: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.site-footer__name {
  font-weight: 800;
  margin: 0;
}
.site-footer__tagline,
.site-footer__owner {
  margin: 0;
  color: var(--color-muted);
  font-size: 0.9rem;
}
.site-footer__links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1) var(--space-2);
  font-size: 0.88rem;
}
.site-footer__links a {
  color: var(--color-body);
  text-decoration: none;
}
.site-footer__links a:hover {
  color: var(--color-main-ink);
}
.site-footer__copyright {
  margin: 0;
  font-size: 0.8rem;
  color: var(--color-faint);
}

@media (prefers-reduced-motion: reduce) {
  * {
    transition-duration: 0.001ms !important;
    animation-duration: 0.001ms !important;
  }
}