/* Shared by the layout mockups: the decided design as provisional components, plus the page grid
   every layout is built from. The grid has named column lines (full, wide, content), so a page
   is a single column of content whose children can break out to wide or full width. */

:root {
  --mk-bar: 49px; /* the mockup toolbar above each page */
  --heading: "Source Serif 4", "Noto Serif SC", "Songti SC", "STSong", var(--mk-cjk), serif;
  --measure: 40rem; /* about 65 characters of English */
  --gutter: 1.25rem;
  --breakout: 9rem; /* how far "wide" reaches past the text on each side */
  --r-card: 22px;
  --r-media: 16px;
  --r-code: 14px;
}
:root:lang(zh) {
  --measure: 36rem; /* about 36 Chinese characters */
}

/* Blend shape: squircle containers, plain arcs for pills and circles. */
body * {
  corner-shape: squircle;
}
:is(.btn, .chip, .fnav, .fnav a, .search, .avatar, .tile, .mk-bar *, .pctl, .pctl *) {
  corner-shape: round;
}

/* ---------- page grid ---------- */
.lay {
  display: grid;
  grid-template-columns:
    [full-start] minmax(var(--gutter), 1fr)
    [wide-start] minmax(0, var(--breakout))
    [content-start] min(var(--measure), 100% - 2 * var(--gutter))
    [content-end] minmax(0, var(--breakout))
    [wide-end] minmax(var(--gutter), 1fr)
    [full-end];
}
.lay > * {
  grid-column: content;
}
.lay > .wide {
  grid-column: wide;
}
.lay > .full {
  grid-column: full;
}

/* ---------- type ---------- */
:is(.lay, .prose) h1,
:is(.lay, .prose) h2,
:is(.lay, .prose) h3 {
  font-family: var(--heading);
  font-weight: 600;
  letter-spacing: -0.015em;
  text-wrap: balance;
}
:root:lang(zh) :is(.lay, .prose) :is(h1, h2, h3) {
  letter-spacing: 0;
  word-break: keep-all;
  overflow-wrap: anywhere;
}
:is(.lay, .prose) p,
:is(.lay, .prose) li {
  color: var(--fg-2);
  line-height: 1.7;
}
:root:lang(zh) :is(.lay, .prose) :is(p, li) {
  line-height: 1.85;
}
:is(.lay, .prose) h2 {
  margin: 2.5rem 0 0.75rem;
  font-size: 1.75rem;
  line-height: 1.25;
}
:is(.lay, .prose) h3 {
  margin: 1.75rem 0 0.5rem;
  font-size: 1.3rem;
}
.kicker {
  margin: 0 0 0.6rem;
  color: var(--accent);
  font: 600 0.78rem/1 var(--mk-mono);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.meta {
  color: var(--fg-3);
  font-size: 0.85rem;
  font-variant-numeric: tabular-nums;
}
:is(.lay, .prose) :not(pre) > code {
  padding: 0.1rem 0.35rem;
  border-radius: 6px;
  background: color-mix(in oklch, var(--fg) 8%, transparent);
  color: var(--fg);
  font: 0.88em var(--mk-mono);
}
:is(.lay, .prose) pre {
  margin: 1.25rem 0;
  padding: 0.95rem 1.1rem;
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: var(--r-code);
  background: var(--bg-2);
  font: 0.86rem/1.65 var(--mk-mono);
}
:is(.lay, .prose) pre .p {
  color: var(--fg-3);
}
:is(.lay, .prose) pre .o {
  color: var(--accent);
}
:is(.lay, .prose) blockquote {
  margin: 1.5rem 0;
  padding: 0.2rem 0 0.2rem 1.1rem;
  border-left: 2px solid var(--accent);
  font: 500 1.2rem/1.6 var(--heading);
  color: var(--fg);
}
:is(.lay, .prose) figure {
  margin: 1.75rem 0;
}
:is(.lay, .prose) figure img,
:is(.lay, .prose) figure video {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--r-media);
}
:is(.lay, .prose) figure.full img {
  border-radius: 0;
}
:is(.lay, .prose) figcaption {
  margin-top: 0.6rem;
  color: var(--fg-3);
  font-size: 0.85rem;
}
:is(.lay, .prose) figure.full figcaption {
  width: min(var(--measure), 100% - 2 * var(--gutter));
  margin-inline: auto;
}
.note {
  margin: 1.25rem 0;
  padding: 0.85rem 1rem;
  border: 1px solid oklch(0.76 0.06 255 / 0.35);
  border-radius: var(--r-code);
  background: oklch(0.76 0.06 255 / 0.08);
  color: oklch(0.86 0.04 255);
  font-size: 0.92rem;
}
:root[data-theme="light"] .note {
  border-color: oklch(0.52 0.07 255 / 0.3);
  background: oklch(0.52 0.07 255 / 0.06);
  color: oklch(0.4 0.07 255);
}

/* ---------- controls ---------- */
.row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  align-items: center;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.5rem 1rem;
  border: 1px solid var(--line-2);
  border-radius: 999px;
  background: none;
  color: var(--fg);
  font: 600 0.88rem/1.2 var(--mk-sans);
  text-decoration: none;
  cursor: pointer;
}
.btn.primary {
  border-color: var(--accent);
  background: var(--accent);
  color: var(--bg);
}
.btn.ghost-light {
  border-color: rgb(255 255 255 / 0.35);
  color: #fff;
}
.chip {
  padding: 0.16rem 0.6rem;
  border: 1px solid transparent;
  border-radius: 999px;
  background: color-mix(in oklch, var(--fg) 8%, transparent);
  color: var(--fg-2);
  font: 600 0.75rem/1.4 var(--mk-sans);
  cursor: pointer;
}
.chip[aria-pressed="true"] {
  border-color: var(--accent);
  color: var(--fg);
}
.search {
  min-width: 14rem;
  padding: 0.5rem 0.9rem;
  border: 1px solid var(--line-2);
  border-radius: 999px;
  background: var(--bg-2);
  color: var(--fg);
  font: 0.9rem var(--mk-sans);
}

/* ---------- site nav: a floating glass pill ---------- */
.fnav {
  position: sticky;
  top: calc(var(--mk-bar) + 0.75rem);
  z-index: 20;
  display: flex;
  gap: 0.2rem;
  align-items: center;
  width: fit-content;
  margin: 0.75rem auto 0;
  padding: 0.3rem 0.35rem 0.3rem 0.95rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: color-mix(in oklch, var(--surface) 72%, transparent);
  backdrop-filter: blur(16px) saturate(140%);
  box-shadow: var(--shadow);
  font-size: 0.88rem;
  white-space: nowrap;
  transition:
    background 0.3s,
    border-color 0.3s,
    box-shadow 0.3s;
}
.fnav b {
  margin-right: 0.6rem;
  font: 600 0.95rem var(--heading);
}
.fnav a {
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  color: var(--fg-2);
  text-decoration: none;
}
.fnav a[aria-current] {
  background: color-mix(in oklch, var(--fg) 10%, transparent);
  color: var(--fg);
}
/* Over a cover image: clear until the page scrolls, then glass. */
.fnav.over:not(.scrolled) {
  border-color: transparent;
  background: transparent;
  backdrop-filter: none;
  box-shadow: none;
  color: #fff;
}
.fnav.over:not(.scrolled) a {
  color: rgb(255 255 255 / 0.8);
}
.fnav.over:not(.scrolled) a[aria-current] {
  background: rgb(255 255 255 / 0.16);
  color: #fff;
}

/* ---------- cards with the liquid hover (glass option 5) ---------- */
.card {
  position: relative;
  border: 1px solid var(--line);
  border-radius: var(--r-card);
  background: var(--bg-2);
  transition:
    transform 0.25s,
    box-shadow 0.25s;
}
.card.hot {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}
.card::before,
.card::after {
  content: "";
  position: absolute;
  inset: -1px;
  z-index: 1;
  border-radius: inherit;
  opacity: 0;
  transition: opacity 0.3s;
  pointer-events: none;
}
.card::before {
  background: radial-gradient(
    300px circle at var(--lx, 50%) var(--ly, 0%),
    color-mix(in oklch, var(--accent) 16%, transparent),
    transparent 55%
  );
}
.card::after {
  padding: 1px;
  background:
    radial-gradient(220px circle at var(--lx, 50%) var(--ly, 0%), var(--accent), transparent 70%),
    linear-gradient(rgb(255 255 255 / 0.16), transparent 40%);
  mask:
    linear-gradient(#000 0 0) content-box exclude,
    linear-gradient(#000 0 0);
}
.card.hot::before,
.card.hot::after {
  opacity: 1;
}

/* ---------- footer with the cats ---------- */
.ffoot {
  position: relative;
  margin-top: 5rem;
  padding: 1.1rem 0 1.4rem;
  border-top: 1px solid var(--line-2);
  color: var(--fg-3);
  font-size: 0.82rem;
  text-align: center;
}
.ffoot .cat {
  position: absolute;
  bottom: calc(100% - 4px);
  width: 56px;
}
.ffoot .cat:nth-of-type(1) {
  left: max(1.25rem, 50% - 30rem);
}
.ffoot .cat:nth-of-type(2) {
  left: calc(max(1.25rem, 50% - 30rem) + 3.1rem);
}
.ffoot .cat:nth-of-type(3) {
  right: max(1.25rem, 50% - 30rem);
}

/* A page-local switch row (only on some layouts). */
.pctl {
  position: fixed;
  right: 1rem;
  bottom: 1rem;
  z-index: 40;
  display: flex;
  gap: 0.3rem;
  padding: 0.3rem;
  border: 1px solid var(--line-2);
  border-radius: 999px;
  background: color-mix(in oklch, var(--surface) 80%, transparent);
  backdrop-filter: blur(12px);
  font: 600 0.75rem var(--mk-mono);
}
.pctl button {
  padding: 0.35rem 0.7rem;
  border: 0;
  border-radius: 999px;
  background: none;
  color: var(--fg-2);
  font: inherit;
  cursor: pointer;
}
.pctl button[aria-pressed="true"] {
  background: var(--accent);
  color: var(--bg);
}

@media (prefers-reduced-motion: reduce) {
  .card,
  .fnav {
    transition: none;
  }
  .card.hot {
    transform: none;
  }
}