/* ==========================================================================
   catonmydesk — Layout
   Header, navigation, page sections, grids and footer.
   ========================================================================== */

/* --------------------------------------------------------------------------
   Page shell
   -------------------------------------------------------------------------- */

body {
  display: flex;
  flex-direction: column;
}

main { flex: 1 0 auto; }

/* --------------------------------------------------------------------------
   Header
   -------------------------------------------------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--header-bg);
  border-bottom: 1px solid transparent;
  transition: border-color var(--t-base), background-color var(--t-base);
}

@supports (backdrop-filter: blur(1px)) {
  .site-header { backdrop-filter: saturate(140%) blur(14px); }
}

.site-header[data-scrolled="true"] { border-bottom-color: var(--border); }

.site-header__inner {
  display: flex;
  align-items: center;
  gap: var(--sp-4);
  height: var(--header-h);
}

/* Brand ------------------------------------------------------------------ */

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--text);
  font-family: var(--font-serif);
  font-size: 1.22rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-right: auto;
}

.brand:hover { color: var(--text); }
.brand:hover .brand__mark { transform: rotate(-5deg) scale(1.06); }

/* The cat on a desk. Colours come from the --logo-* tokens, so the whole
   drawing flips with the theme. */
.brand__mark {
  width: 32px;
  height: 32px;
  flex: none;
  transform-origin: 50% 70%;
  transition: transform var(--t-base);
}

.brand__name { white-space: nowrap; }
.brand__dot { color: var(--accent); }

/* Primary nav ------------------------------------------------------------ */

.nav {
  display: flex;
  align-items: center;
  gap: 0.15rem;
}

.nav__link {
  position: relative;
  display: inline-block;
  padding: 0.42rem 0.85rem;
  border-radius: var(--r-full);
  color: var(--text-muted);
  font-size: var(--fs-sm);
  font-weight: 500;
  transition: color var(--t-fast), background-color var(--t-fast);
}

.nav__link:hover {
  color: var(--text);
  background: var(--bg-subtle);
}

/* The current page gets a filled pill rather than an underline. */
.nav__link[aria-current="page"] {
  color: var(--accent);
  background: var(--accent-soft);
  font-weight: 600;
}

.header__tools {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

/* Mobile menu button ----------------------------------------------------- */

.nav-toggle {
  display: none;
  width: 38px;
  height: 38px;
  border-radius: var(--r-md);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  place-items: center;
  transition: background-color var(--t-fast), border-color var(--t-fast);
}

.nav-toggle:hover { border-color: var(--border-strong); }

.nav-toggle__bars,
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  display: block;
  width: 16px;
  height: 1.5px;
  border-radius: 2px;
  background: currentColor;
  transition: transform var(--t-base), opacity var(--t-fast);
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
}

.nav-toggle__bars::before { transform: translateY(-5px); }
.nav-toggle__bars::after  { transform: translateY(5px); }

.nav-toggle[aria-expanded="true"] .nav-toggle__bars { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after  { transform: rotate(-45deg); }

@media (max-width: 760px) {
  .nav-toggle { display: grid; position: relative; }

  .nav {
    position: fixed;
    inset: var(--header-h) 0 auto 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0.2rem;
    padding: var(--sp-3) var(--gutter) var(--sp-5);
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-lg);
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--t-base), transform var(--t-base);
  }

  .nav[data-open="true"] {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav__link {
    padding: 0.7rem 0.85rem;
    font-size: var(--fs-md);
  }

  .nav__link[aria-current="page"] { background: var(--bg-subtle); }
  .nav__link[aria-current="page"]::after { display: none; }
}

/* --------------------------------------------------------------------------
   Sections
   -------------------------------------------------------------------------- */

.section {
  padding-block: var(--sp-9);
  border-top: 1px solid transparent;
}

.section--tight { padding-block: var(--sp-8); }

.section--alt {
  background: var(--bg-subtle);
  border-top-color: var(--border);
  border-bottom: 1px solid var(--border);
}

.section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--sp-3);
  margin-bottom: var(--sp-6);
}

.section__head p { color: var(--text-muted); margin-top: 0.35rem; }

/* Page header (non-home pages) ------------------------------------------- */

.page-head {
  position: relative;
  padding-block: var(--sp-8) var(--sp-7);
  border-bottom: 1px solid var(--border);
  background:
    radial-gradient(60% 120% at 12% -10%, var(--glow-1), transparent 62%),
    var(--bg-subtle);
}

.page-head h1 { margin-top: 0.4rem; }
.page-head .lede { margin-top: var(--sp-3); }

/* A page header already carries its own breathing room. */
.page-head + .section { padding-top: var(--sp-7); }

/* --------------------------------------------------------------------------
   Hero (home)
   -------------------------------------------------------------------------- */

.hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(var(--sp-7), 7vw, var(--sp-9)) var(--sp-7);
}

.hero__glow {
  position: absolute;
  inset: -40% -10% auto -10%;
  height: 130%;
  z-index: -1;
  background:
    radial-gradient(38% 46% at 20% 42%, var(--glow-1), transparent 68%),
    radial-gradient(42% 42% at 82% 26%, var(--glow-2), transparent 70%);
  pointer-events: none;
}

.hero__inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
  gap: var(--sp-6) var(--sp-8);
  align-items: center;
}

.hero__meta { grid-column: 1 / -1; }

.hero__aside svg { width: 100%; height: auto; }

@media (max-width: 980px) {
  .hero__inner { grid-template-columns: 1fr; }
  .hero__aside { max-width: 430px; order: -1; }
}

.hero h1 {
  font-size: var(--fs-4xl);
  margin-top: var(--sp-4);
  max-width: 15ch;
}

.hero h1 em {
  font-style: italic;
  color: var(--accent);
}

.hero .lede { margin-top: var(--sp-5); }

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-3);
  margin-top: var(--sp-6);
}

.hero__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--sp-2) var(--sp-5);
  margin-top: var(--sp-7);
  padding-top: var(--sp-5);
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: var(--fs-sm);
}

.hero__meta li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.hero__meta svg { color: var(--accent); }

/* --------------------------------------------------------------------------
   Grids
   -------------------------------------------------------------------------- */

.grid {
  display: grid;
  gap: var(--sp-4);
}

.grid--2 { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fill, minmax(290px, 1fr)); }
.grid--4 { grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); }

.split {
  display: grid;
  gap: var(--sp-7);
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  align-items: start;
}

@media (max-width: 860px) {
  .split { grid-template-columns: 1fr; gap: var(--sp-6); }
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */

.site-footer {
  margin-top: auto;
  background: var(--bg-subtle);
  border-top: 1px solid var(--border);
  padding-block: var(--sp-7) var(--sp-5);
  font-size: var(--fs-sm);
}

/* Wordmark on the left, link columns hugging the right. */
.site-footer__grid {
  display: grid;
  gap: var(--sp-6) var(--sp-9);
  grid-template-columns: minmax(0, 1fr) auto auto;
}

@media (max-width: 780px) {
  .site-footer__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--sp-5);
  }
  .site-footer__about { grid-column: 1 / -1; }
}

.site-footer h5 {
  color: var(--text-faint);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
  font-size: var(--fs-xs);
  margin-bottom: var(--sp-3);
}

.footer-links li + li { margin-top: 0.45rem; }

.footer-links a {
  color: var(--text-muted);
  transition: color var(--t-fast);
}

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

.site-footer__bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-3);
  margin-top: var(--sp-7);
  padding-top: var(--sp-4);
  border-top: 1px solid var(--border);
  color: var(--text-faint);
  font-size: var(--fs-xs);
}

.site-footer__bar a { color: var(--text-muted); }
.site-footer__bar a:hover { color: var(--accent); }