/* ==========================================================================
   Cap Stacks — modern institutional newsletter site
   ========================================================================== */

:root {
  --bg: #FAFAF7;
  --bg-elev: #FFFFFF;
  --fg: #0F1419;
  --fg-muted: #6B6B63;
  --fg-subtle: #8A8A82;
  --border: #E5E5E0;
  --border-strong: #1a1a1a;
  --accent: #A32D2D;
  --accent-soft: #FCEBEB;
  --highlight: #1A6E56;
  --highlight-soft: #E1F5EE;

  --font-serif: "Crimson Pro", Georgia, "Times New Roman", serif;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  --container: 1180px;
  --container-narrow: 720px;
  --space-xs: 0.5rem;
  --space-s: 0.75rem;
  --space-m: 1rem;
  --space-l: 1.5rem;
  --space-xl: 2.5rem;
  --space-2xl: 4rem;
  --space-3xl: 6rem;

  --radius: 4px;
}

* { box-sizing: border-box; }

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  margin: 0;
  background-color: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
}

img, svg { max-width: 100%; display: block; }

a {
  color: var(--fg);
  text-decoration: none;
  transition: color 120ms ease, opacity 120ms ease;
}

a:hover { color: var(--accent); }

::selection { background: var(--fg); color: var(--bg); }

/* Layout primitives */

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.container--narrow {
  max-width: var(--container-narrow);
}

.muted { color: var(--fg-muted); }

/* Buttons */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 500;
  line-height: 1;
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  letter-spacing: 0.01em;
  transition: all 150ms ease;
}

.btn--primary {
  background: var(--fg);
  color: var(--bg);
  border-color: var(--fg);
}
.btn--primary:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.btn--ghost {
  background: transparent;
  color: var(--fg);
  border-color: var(--border);
}
.btn--ghost:hover {
  border-color: var(--fg);
}

/* Site header */

.site-header {
  border-bottom: 1px solid var(--border);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 1.25rem;
  padding-bottom: 1.25rem;
  gap: 2rem;
}

.site-header__brand {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg);
}
.site-header__brand:hover { color: var(--fg); opacity: 0.7; }

.brand__divider { color: var(--fg-subtle); font-weight: 400; }
.brand__tagline { color: var(--fg-muted); font-weight: 500; }

.site-nav { flex: 1 1 auto; display: flex; justify-content: center; }
.site-nav ul {
  display: flex;
  gap: 1.75rem;
  list-style: none;
  margin: 0;
  padding: 0;
}
.site-nav a {
  font-size: 0.9rem;
  color: var(--fg-muted);
  font-weight: 500;
}
.site-nav a:hover { color: var(--fg); }

.site-header__cta { white-space: nowrap; }

/* Hero */

.hero {
  padding: 6rem 0 5rem;
  border-bottom: 1px solid var(--border);
}

.hero__inner {
  max-width: 880px;
  text-align: left;
}

.hero__eyebrow {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--fg-subtle);
  margin: 0 0 1.5rem;
}

.hero__headline {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(2.25rem, 5vw, 3.75rem);
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--fg);
  margin: 0 0 1.5rem;
}

.hero__headline--accent {
  color: var(--fg-muted);
  font-style: italic;
  font-weight: 500;
}

.hero__sub {
  font-size: 1.15rem;
  line-height: 1.55;
  color: var(--fg-muted);
  max-width: 620px;
  margin: 0 0 2.25rem;
}

.hero__form {
  display: flex;
  gap: 0.5rem;
  max-width: 520px;
  margin-bottom: 0.75rem;
}

.hero__input,
.signup__input {
  flex: 1 1 auto;
  font-family: var(--font-sans);
  font-size: 1rem;
  padding: 0.85rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-elev);
  color: var(--fg);
  outline: none;
  transition: border-color 150ms ease;
}
.hero__input:focus,
.signup__input:focus {
  border-color: var(--fg);
}

.hero__submit, .signup__submit { white-space: nowrap; }

.hero__fineprint {
  font-size: 0.83rem;
  color: var(--fg-subtle);
  margin: 0;
}

/* Pillars */

.pillars {
  padding: 5rem 0;
  border-bottom: 1px solid var(--border);
  background: var(--bg-elev);
}

.pillars__inner {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 3rem;
}

.pillar__num {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--fg-subtle);
  margin: 0 0 1rem;
  letter-spacing: 0.05em;
}

.pillar__title {
  font-family: var(--font-serif);
  font-size: 1.6rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 0 0 0.75rem;
  color: var(--fg);
}

.pillar__copy {
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--fg-muted);
  margin: 0;
}

/* Latest / sections */

.latest, .archive, .related {
  padding: 5rem 0;
}

.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 2.5rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 1rem;
}

.section-title {
  font-family: var(--font-serif);
  font-size: 1.85rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 0;
  color: var(--fg);
}

.section-link {
  font-size: 0.88rem;
  color: var(--fg-muted);
  font-weight: 500;
}
.section-link:hover { color: var(--fg); }

/* Post grid */

.post-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2.5rem;
}

.post-card {
  border-top: 1px solid var(--border-strong);
  padding-top: 1.25rem;
}

.post-card__link {
  display: block;
  color: var(--fg);
}

.post-card__meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.8rem;
  color: var(--fg-subtle);
  margin: 0 0 0.6rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.post-card__tag {
  display: inline-block;
  padding: 0.15rem 0.55rem;
  background: var(--accent-soft);
  color: var(--accent);
  border-radius: var(--radius);
  text-transform: none;
  letter-spacing: 0;
  font-size: 0.72rem;
}

.post-card__title {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin: 0 0 0.75rem;
  color: var(--fg);
}

.post-card:hover .post-card__title { color: var(--accent); }

.post-card__excerpt {
  font-size: 0.95rem;
  line-height: 1.55;
  color: var(--fg-muted);
  margin: 0 0 1rem;
}

.post-card__readmore {
  font-size: 0.83rem;
  font-weight: 500;
  color: var(--fg);
  margin: 0;
  letter-spacing: 0.01em;
}

/* Empty state */

.empty-state {
  text-align: center;
  padding: 4rem 2rem;
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  background: var(--bg-elev);
}
.empty-state__title {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  margin: 0 0 0.5rem;
  color: var(--fg);
}
.empty-state__sub {
  margin: 0;
  color: var(--fg-muted);
}

/* Quote */

.quote {
  padding: 5rem 0;
  background: var(--bg-elev);
  border-bottom: 1px solid var(--border);
}

.quote__inner { max-width: 880px; margin: 0 auto; padding: 0 1.5rem; }

.quote blockquote {
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 3vw, 2rem);
  line-height: 1.3;
  font-weight: 500;
  font-style: italic;
  color: var(--fg);
  margin: 0;
  padding-left: 1.5rem;
  border-left: 3px solid var(--accent);
}

.quote__attr {
  margin: 1.25rem 0 0 1.5rem;
  font-size: 0.88rem;
  color: var(--fg-subtle);
  letter-spacing: 0.04em;
}

/* Signup section */

.signup {
  padding: 5rem 0;
  background: var(--fg);
  color: var(--bg);
}

.signup__inner {
  max-width: 720px;
  text-align: center;
}

.signup__headline {
  font-family: var(--font-serif);
  font-size: clamp(1.85rem, 4vw, 2.75rem);
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.1;
  margin: 0 0 1rem;
}

.signup__sub {
  font-size: 1.05rem;
  color: rgba(250, 250, 247, 0.78);
  margin: 0 0 2rem;
  line-height: 1.55;
}

.signup__form {
  display: flex;
  gap: 0.5rem;
  max-width: 520px;
  margin: 0 auto 0.85rem;
}

.signup__input {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.18);
  color: var(--bg);
}
.signup__input::placeholder { color: rgba(250, 250, 247, 0.55); }
.signup__input:focus { border-color: var(--bg); }

.signup .btn--primary {
  background: var(--bg);
  color: var(--fg);
  border-color: var(--bg);
}
.signup .btn--primary:hover {
  background: var(--accent);
  color: var(--bg);
  border-color: var(--accent);
}

.signup__fineprint { color: rgba(250, 250, 247, 0.55); }

/* Single post page */

.post {
  padding: 4rem 0 5rem;
}

.post__header {
  margin-bottom: 3rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 2rem;
}

.post__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 0.75rem;
  font-size: 0.83rem;
  color: var(--fg-subtle);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin: 0 0 1.5rem;
}
.post__divider { color: var(--border); }
.post__tag { color: var(--accent); }
.post__readtime {}

.post__title {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4.5vw, 3rem);
  font-weight: 600;
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: 0;
  color: var(--fg);
}

.post__excerpt {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-style: italic;
  line-height: 1.4;
  color: var(--fg-muted);
  margin: 1.25rem 0 0;
}

.post__body {
  font-family: var(--font-sans);
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--fg);
}

/* Don't fight the Ghost-rendered email HTML — it's already styled inline.
   Just ensure outer constraints are sane. */
.post__body > div,
.post__body > table { margin-left: auto; margin-right: auto; }

/* Ghost Koenig editor card width classes — required by Ghost theme spec */
.kg-width-wide {
  position: relative;
  width: 85vw;
  max-width: 1040px;
  left: 50%;
  transform: translateX(-50%);
  margin: 2rem 0;
}

.kg-width-full {
  position: relative;
  width: 100vw;
  max-width: 100vw;
  left: 50%;
  transform: translateX(-50%);
  margin: 2rem 0;
}

.kg-width-wide img,
.kg-width-full img { width: 100%; height: auto; }

.kg-image-card figcaption,
.kg-embed-card figcaption {
  text-align: center;
  font-size: 0.9rem;
  color: var(--fg-muted);
  margin-top: 0.5rem;
  font-style: italic;
}

.post__body p { margin: 0 0 1.25rem; }
.post__body h2 {
  font-family: var(--font-serif);
  font-size: 1.6rem;
  font-weight: 600;
  margin: 2.5rem 0 1rem;
}
.post__body h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin: 1.75rem 0 0.5rem;
}
.post__body a {
  color: var(--accent);
  border-bottom: 1px solid currentColor;
}
.post__body blockquote {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-style: italic;
  border-left: 3px solid var(--accent);
  padding-left: 1.25rem;
  margin: 2rem 0;
  color: var(--fg-muted);
}
.post__body code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--bg-elev);
  padding: 0.1em 0.35em;
  border-radius: 3px;
}

.post__footer {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

.post__share {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.share-link {
  font-size: 0.85rem;
  color: var(--fg-muted);
  font-weight: 500;
  letter-spacing: 0.02em;
}
.share-link:hover { color: var(--accent); }

/* Page (about, etc.) */

.page { padding: 4rem 0 5rem; }
.page__header { margin-bottom: 3rem; }
.page__title {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4vw, 2.85rem);
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 0;
}
.page__excerpt {
  font-size: 1.15rem;
  color: var(--fg-muted);
  margin: 1rem 0 0;
}
.page__body {
  font-size: 1.05rem;
  line-height: 1.7;
}

.page__body h2,
.page__body h3 {
  font-family: var(--font-serif);
  font-weight: 600;
  letter-spacing: -0.01em;
}
.page__body h2 { font-size: 1.6rem; margin: 2.5rem 0 1rem; }
.page__body h3 { font-size: 1.2rem; margin: 1.75rem 0 0.5rem; }
.page__body p { margin: 0 0 1.25rem; }
.page__body a {
  color: var(--accent);
  border-bottom: 1px solid currentColor;
}

/* Tag / archive */

.taxonomy { padding: 4rem 0 2rem; }
.taxonomy__eyebrow {
  font-size: 0.76rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--fg-subtle);
  margin: 0 0 0.75rem;
}
.taxonomy__title {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4.5vw, 3rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  margin: 0 0 1rem;
}
.taxonomy__sub {
  font-size: 1.1rem;
  color: var(--fg-muted);
  margin: 0 0 1rem;
}
.taxonomy__count {
  font-size: 0.88rem;
  color: var(--fg-subtle);
  margin: 0;
}

.archive .post-grid {
  grid-template-columns: 1fr;
  gap: 2rem;
}
.archive .post-card { padding-top: 1.5rem; }
.archive .post-card__title { font-size: 1.55rem; }

/* Footer */

.site-footer {
  background: var(--fg);
  color: var(--bg);
  padding: 4rem 0 2rem;
}

.site-footer__inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-brand {
  font-family: var(--font-serif);
  font-size: 1.6rem;
  font-weight: 600;
  margin: 0 0 0.75rem;
  letter-spacing: -0.01em;
}

.footer-tagline {
  font-size: 0.95rem;
  color: rgba(250, 250, 247, 0.65);
  line-height: 1.55;
  margin: 0;
  max-width: 380px;
}

.footer-heading {
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(250, 250, 247, 0.55);
  margin: 0 0 1rem;
  font-weight: 600;
}

.footer-links {
  list-style: none;
  margin: 0;
  padding: 0;
}
.footer-links li { margin-bottom: 0.5rem; }
.footer-links a {
  color: var(--bg);
  font-size: 0.95rem;
}
.footer-links a:hover { color: var(--accent); }

.site-footer__meta {
  border-top: 1px solid rgba(250, 250, 247, 0.12);
  padding-top: 1.5rem;
  font-size: 0.82rem;
  color: rgba(250, 250, 247, 0.55);
}
.site-footer__meta p { margin: 0 0 0.5rem; }
.site-footer__meta .muted { color: rgba(250, 250, 247, 0.4); }

/* Error page */

.error {
  padding: 6rem 0;
  text-align: center;
}
.error__code {
  font-family: var(--font-mono);
  font-size: 4rem;
  color: var(--accent);
  margin: 0 0 1rem;
  font-weight: 500;
}
.error__title {
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 600;
  margin: 0 0 1rem;
}
.error__sub {
  color: var(--fg-muted);
  font-size: 1.05rem;
}
.error__sub a {
  color: var(--accent);
  border-bottom: 1px solid currentColor;
}

/* Pagination */

.pagination {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
  font-size: 0.9rem;
}
.pagination a, .pagination span {
  color: var(--fg-muted);
}
.pagination a:hover { color: var(--accent); }

/* Quote section accent on dark — works both light/dark */

@media (max-width: 960px) {
  .pillars__inner { grid-template-columns: 1fr; gap: 2.5rem; }
  .post-grid { grid-template-columns: 1fr 1fr; gap: 2rem; }
  .site-footer__inner { grid-template-columns: 1fr 1fr; gap: 2rem; }
  .site-nav { display: none; }
  .hero { padding: 4rem 0 3rem; }
  .hero__form, .signup__form { flex-direction: column; max-width: 100%; }
}

@media (max-width: 600px) {
  .post-grid { grid-template-columns: 1fr; }
  .site-footer__inner { grid-template-columns: 1fr; }
  .site-header__inner { gap: 1rem; }
  .brand__tagline { display: none; }
  .container { padding: 0 1rem; }
  .latest, .archive, .related, .pillars, .quote, .signup { padding: 3rem 0; }
}