/* style.css — A-Positive components and layout */

/* ============= Layout primitives ============= */

main {
  display: block;
  padding-bottom: var(--space-24);
}

/* ============= Site header (sticky, blurred) ============= */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--backdrop);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--color-divider);
}

.site-header__inner {
  width: 100%;
  max-width: var(--content-wide);
  margin: 0 auto;
  padding: var(--space-3) var(--space-5);
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: var(--space-6);
  min-height: 56px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-text);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--text-base);
  letter-spacing: -0.02em;
  text-decoration: none;
}

.brand:hover {
  color: var(--color-text);
  text-decoration: none;
}

.brand__mark {
  color: var(--color-primary);
}

.brand__name {
  font-feature-settings: "ss01";
  font-size: var(--text-base);
  letter-spacing: -0.02em;
}

.btn--rss {
  display: inline-flex;
  align-items: center;
  gap: 0.45em;
}

.btn--rss svg {
  flex: 0 0 auto;
  opacity: 0.85;
}

.nav {
  display: flex;
  justify-content: center;
  gap: var(--space-2);
}

.nav__link {
  display: inline-block;
  padding: var(--space-2) var(--space-3);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  font-weight: 500;
  border-radius: var(--radius-full);
  text-decoration: none;
}

.nav__link:hover {
  color: var(--color-text);
  background: var(--color-surface-2);
  text-decoration: none;
}

.nav__link.is-active {
  color: var(--color-text);
  background: var(--color-surface-2);
}

.header-actions {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  justify-self: end;
}

.header-rss {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-full);
  color: var(--color-text-muted);
  text-decoration: none;
  margin-right: 2px;
}

.header-rss:hover {
  color: var(--color-text);
  background: var(--color-surface-2);
  text-decoration: none;
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-full);
  color: var(--color-text-muted);
}

.theme-toggle:hover {
  color: var(--color-text);
  background: var(--color-surface-2);
}

.theme-toggle__icon--moon {
  display: none;
}

[data-theme="dark"] .theme-toggle__icon--sun {
  display: none;
}

[data-theme="dark"] .theme-toggle__icon--moon {
  display: block;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) .theme-toggle__icon--sun {
    display: none;
  }
  :root:not([data-theme]) .theme-toggle__icon--moon {
    display: block;
  }
}

/* ============= Buttons ============= */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  height: 44px;
  padding: 0 var(--space-5);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 500;
  text-decoration: none;
  letter-spacing: -0.01em;
  white-space: nowrap;
  transition:
    background var(--transition-interactive),
    color var(--transition-interactive),
    border-color var(--transition-interactive),
    transform var(--transition-fast);
}

.btn--primary {
  background: var(--color-primary);
  color: #fff;
}

.btn--primary:hover {
  background: var(--color-primary-hover);
  color: #fff;
  text-decoration: none;
}

.btn--primary:active {
  background: var(--color-primary-active);
  transform: translateY(1px);
}

.btn--ghost {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn--ghost:hover {
  background: var(--color-surface-2);
  text-decoration: none;
}

/* ============= Hero (blog index) ============= */

.hero {
  max-width: var(--content-wide);
  margin: 0 auto;
  padding: clamp(var(--space-16), 10vw, var(--space-32)) var(--space-5) var(--space-16);
  text-align: center;
}

.hero__eyebrow {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-primary);
  letter-spacing: 0.02em;
  margin-bottom: var(--space-5);
}

.hero__title {
  font-size: var(--text-3xl);
  line-height: 1.05;
  letter-spacing: -0.03em;
  font-weight: 600;
  max-width: 18ch;
  margin: 0 auto var(--space-6);
  /* gradient text */
  background: linear-gradient(180deg, var(--color-text), color-mix(in oklab, var(--color-text), var(--color-text-muted) 35%));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero__tagline {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  max-width: 56ch;
  margin: 0 auto var(--space-10);
  line-height: 1.45;
}

.hero__actions {
  display: inline-flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-3);
}

/* ============= Section headings ============= */

.section-head {
  max-width: var(--content-wide);
  margin: 0 auto;
  padding: 0 var(--space-5);
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-4);
  flex-wrap: wrap;
  margin-bottom: var(--space-8);
}

.section-head--center {
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: var(--space-3);
}

.section-head__title {
  font-size: var(--text-xl);
  font-weight: 600;
  letter-spacing: -0.022em;
}

.section-head__title--xl {
  font-size: var(--text-2xl);
  max-width: 22ch;
  margin: 0 auto;
}

.section-head__hint {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

/* ============= Latest + archive ============= */

.latest {
  margin: var(--space-12) auto var(--space-20);
  max-width: var(--content-wide);
  padding: 0 var(--space-5);
}

.archive {
  margin: 0 auto;
  max-width: var(--content-wide);
  padding: 0 var(--space-5);
}

.post-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
}

@media (min-width: 720px) {
  .post-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-6);
  }
}

@media (min-width: 1080px) {
  .post-grid {
    grid-template-columns: 1fr 1fr 1fr;
  }
}

/* ============= Post card ============= */

.post-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-6);
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-xl);
  color: var(--color-text);
  text-decoration: none;
  transition:
    transform var(--transition-interactive),
    border-color var(--transition-interactive),
    box-shadow var(--transition-interactive),
    background var(--transition-interactive);
}

.post-card:hover {
  text-decoration: none;
  color: var(--color-text);
  border-color: var(--color-border);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.post-card--featured {
  margin-top: var(--space-2);
  padding: clamp(var(--space-8), 4vw, var(--space-12));
  background: linear-gradient(135deg, var(--color-surface), var(--color-surface-2));
}

.post-card--featured .post-card__title {
  font-size: var(--text-2xl);
  max-width: 22ch;
}

.post-card--featured .post-card__excerpt {
  font-size: var(--text-lg);
  max-width: 60ch;
}

.post-card__meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-2);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  letter-spacing: 0.01em;
}

.post-card__sep {
  opacity: 0.6;
}

.post-card__chip {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px var(--space-2);
  border-radius: var(--radius-full);
  background: var(--color-accent-soft);
  color: var(--color-primary);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.02em;
}
.post-card__chip--podcast { background: rgba(255, 90, 95, 0.12); color: #d63a45; }
[data-theme="dark"] .post-card__chip--podcast { background: rgba(255, 138, 142, 0.16); color: #ff8a8e; }

.post-card__title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  letter-spacing: -0.022em;
  line-height: 1.18;
  color: var(--color-text);
}

.post-card__excerpt {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  line-height: 1.5;
  max-width: 56ch;
}

.post-card__cta {
  margin-top: auto;
  padding-top: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-primary);
  font-weight: 500;
}

/* ============= Post (article) page ============= */

.post {
  max-width: var(--content-prose);
  margin: 0 auto;
  padding: clamp(var(--space-10), 6vw, var(--space-20)) var(--space-5) var(--space-16);
}

.post-header {
  margin-bottom: var(--space-10);
}

.post-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
  letter-spacing: 0.01em;
}

.post-meta__sep {
  opacity: 0.6;
}

.post-meta__chip {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px var(--space-2);
  border-radius: var(--radius-full);
  background: var(--color-accent-soft);
  color: var(--color-primary);
  font-size: 11px;
  font-weight: 500;
}
.post-meta__chip--podcast { background: rgba(255, 90, 95, 0.12); color: #d63a45; }
[data-theme="dark"] .post-meta__chip--podcast { background: rgba(255, 138, 142, 0.16); color: #ff8a8e; }

.post-title {
  font-size: var(--text-2xl);
  font-weight: 600;
  letter-spacing: -0.028em;
  line-height: 1.05;
  max-width: 22ch;
}

.post-body {
  font-size: var(--text-base);
  line-height: 1.7;
  color: var(--color-text);
}

.post-body > * + * {
  margin-top: var(--space-5);
}

.post-body p,
.post-body li {
  max-width: 68ch;
}

.post-body h2,
.post-body h3,
.post-body h4 {
  margin-top: var(--space-12);
  margin-bottom: var(--space-3);
  font-family: var(--font-display);
  letter-spacing: -0.022em;
}

.post-body h2 {
  font-size: var(--text-xl);
}

.post-body h3 {
  font-size: var(--text-lg);
  font-weight: 600;
}

.post-body h4 {
  font-size: var(--text-base);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
}

.post-body ul,
.post-body ol {
  padding-left: var(--space-6);
}

.post-body li + li {
  margin-top: var(--space-2);
}

.post-body blockquote {
  border-left: 3px solid var(--color-primary);
  padding-left: var(--space-5);
  margin-block: var(--space-6);
  color: var(--color-text);
}

.post-body blockquote p {
  font-style: italic;
}

.post-body hr {
  border: 0;
  border-top: 1px solid var(--color-divider);
  margin: var(--space-10) 0;
}

.post-body a {
  color: var(--color-primary);
}

.post-body code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--color-surface-2);
  padding: 2px var(--space-2);
  border-radius: var(--radius-sm);
}

.post-body strong {
  font-weight: 600;
  color: var(--color-text);
}

/* ============= Transcript block ============= */

.transcript {
  margin: var(--space-8) 0;
  padding: var(--space-6) var(--space-6);
  border-radius: var(--radius-lg);
  background: var(--color-surface-2);
  border: 1px solid var(--color-divider);
  position: relative;
}

.transcript__label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-text-muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: var(--space-3);
}

.transcript__icon {
  color: var(--color-primary);
}

.transcript__quote {
  border-left: 3px solid var(--color-primary);
  padding-left: var(--space-5);
  margin: 0;
}

.transcript__quote p {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  line-height: 1.45;
  letter-spacing: -0.012em;
  color: var(--color-text);
  font-weight: 400;
}

.transcript__quote p + p {
  margin-top: var(--space-3);
}

/* ============= Post nav ============= */

.post-nav {
  margin-top: var(--space-16);
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-divider);
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.post-nav__link {
  display: block;
  color: var(--color-text-muted);
  text-decoration: none;
}

.post-nav__link--index {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  font-weight: 500;
}

.post-nav__link--index:hover {
  color: var(--color-text);
  text-decoration: none;
}

.post-nav__pair {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
}

@media (min-width: 720px) {
  .post-nav__pair {
    grid-template-columns: 1fr 1fr;
  }

  .post-nav__link--next {
    text-align: right;
  }
}

.post-nav__link--prev,
.post-nav__link--next {
  padding: var(--space-5);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  transition:
    border-color var(--transition-interactive),
    box-shadow var(--transition-interactive);
}

.post-nav__link--prev:hover,
.post-nav__link--next:hover {
  border-color: var(--color-border);
  box-shadow: var(--shadow-sm);
  text-decoration: none;
}

.post-nav__direction {
  display: block;
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-bottom: var(--space-1);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.post-nav__title {
  display: block;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text);
  font-family: var(--font-display);
  letter-spacing: -0.015em;
}

/* ============= Podcast page ============= */

.podcast-hero {
  max-width: var(--content-wide);
  margin: 0 auto;
  padding: clamp(var(--space-12), 8vw, var(--space-24)) var(--space-5) var(--space-12);
}

.podcast-hero__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-10);
  align-items: center;
}

@media (min-width: 768px) {
  .podcast-hero__inner {
    grid-template-columns: minmax(0, 320px) 1fr;
    gap: var(--space-12);
  }
}

.podcast-hero__art {
  width: 100%;
  max-width: 320px;
  margin: 0 auto;
}

.podcast-hero__art img {
  width: 100%;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
}

.podcast-hero__copy {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.podcast-hero__title {
  font-size: var(--text-3xl);
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1;
  background: linear-gradient(180deg, var(--color-text), color-mix(in oklab, var(--color-text), var(--color-text-muted) 35%));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.podcast-hero__tagline {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  max-width: 52ch;
  line-height: 1.45;
}

.podcast-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-3);
}

.podcast-embed {
  max-width: var(--content-default);
  margin: var(--space-12) auto 0;
  padding: 0 var(--space-5);
}

.podcast-embed__frame {
  display: flex;
  justify-content: center;
  margin-top: var(--space-6);
}

.podcast-embed__note {
  margin-top: var(--space-8);
  text-align: center;
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

/* ============= About page ============= */

.about {
  max-width: var(--content-default);
  margin: 0 auto;
  padding: clamp(var(--space-12), 8vw, var(--space-24)) var(--space-5) var(--space-16);
}

.about__body {
  margin: var(--space-10) auto 0;
  max-width: var(--content-prose);
  font-size: var(--text-lg);
  line-height: 1.6;
  color: var(--color-text);
}

.about__body p + p {
  margin-top: var(--space-5);
}

.about__cta {
  margin-top: var(--space-8);
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-3);
}

/* ============= Site footer ============= */

.site-footer {
  border-top: 1px solid var(--color-divider);
  background: var(--color-surface);
  margin-top: var(--space-24);
}

.site-footer__inner {
  max-width: var(--content-wide);
  margin: 0 auto;
  padding: var(--space-10) var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

@media (min-width: 720px) {
  .site-footer__inner {
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-start;
  }
}

.site-footer__brand {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  max-width: 44ch;
}

.site-footer__tagline {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.5;
}

.site-footer__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.site-footer__sep {
  opacity: 0.6;
}

.site-footer__meta a {
  color: var(--color-text);
}

/* ============= Small screen polish ============= */

@media (max-width: 600px) {
  .site-header__inner {
    grid-template-columns: auto 1fr auto;
    gap: var(--space-3);
  }

  .nav {
    gap: 0;
  }

  .nav__link {
    padding: var(--space-2);
    font-size: 13px;
  }

  .hero__title {
    font-size: var(--text-2xl);
  }

  .post-card--featured .post-card__title {
    font-size: var(--text-xl);
  }
}