/* Hallmark · genre: atmospheric · macrostructure: Index-First · theme: Midnight
 * nav: N5 Floating pill (content-sized / blur+saturate / top-centred) · footer: Ft5 Statement
 * enrichment: none (typography only) · audience: 中文工具站访客 · use: 三站导航索引 · tone: atmospheric/technical
 * pre-emit critique: P5 H5 E5 S4 R5 V5
 */

/* ---------- fonts (self-hosted, latin only; CJK falls back to system) ---------- */
@font-face {
  font-family: "Geist";
  src: url("fonts/geist-400.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Geist";
  src: url("fonts/geist-600.woff2") format("woff2");
  font-weight: 600;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Geist Mono";
  src: url("fonts/geist-mono-400.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

/* ---------- base ---------- */
html { overflow-x: clip; }
body {
  overflow-x: clip;
  margin: 0;
  background: var(--color-paper);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

::selection { background: var(--color-accent); color: var(--color-paper); }

a {
  color: inherit;
  text-decoration: none;
}
a:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 3px;
  border-radius: var(--space-3xs);
}

/* quiet opacity entrance — one orchestrated moment, no slide */
@keyframes fade-in {
  from { opacity: 0; }
  to   { opacity: 1; }
}
.fade {
  opacity: 0;
  animation: fade-in var(--dur-long) var(--ease-out) forwards;
  animation-delay: calc(var(--i, 0) * 90ms);
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 150ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 150ms !important;
  }
}

/* ---------- N5 · floating pill nav ---------- */
.nav-pill {
  position: fixed;
  inset: var(--space-md) auto auto 50%;
  transform: translateX(-50%);
  display: inline-flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-2xs) var(--space-sm);
  background: color-mix(in oklch, var(--color-paper) 78%, transparent);
  backdrop-filter: blur(14px) saturate(120%);
  border: var(--rule-hair) solid var(--color-rule);
  border-radius: var(--radius-pill);
  box-shadow: 0 8px 24px -12px oklch(0% 0 0 / 0.18);
  z-index: var(--z-sticky);
  white-space: nowrap;
}
.nav-pill__brand {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--text-sm);
  letter-spacing: -0.01em;
  padding-inline: var(--space-xs);
}
.nav-pill__links {
  display: flex;
  gap: var(--space-sm);
  margin: 0;
  padding: 0;
  list-style: none;
}
.nav-pill__links a {
  font-size: var(--text-sm);
  color: var(--color-muted);
  padding: var(--space-2xs) var(--space-xs);
  border-radius: var(--radius-pill);
  transition: color var(--dur-micro) var(--ease-out);
}
.nav-pill__links a:hover { color: var(--color-ink); }
.nav-pill__cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2xs);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-paper);
  background: var(--color-accent);
  padding: var(--space-2xs) var(--space-sm);
  border-radius: var(--radius-pill);
  transition: transform 100ms var(--ease-out);
}
.nav-pill__cta:hover  { transform: translateY(-1px); }
.nav-pill__cta:active { transform: translateY(0); }
@media (max-width: 40rem) {
  .nav-pill { inset: var(--space-sm) var(--space-sm) auto auto; transform: none; }
  .nav-pill__links { display: none; }
}

/* ---------- page ---------- */
.page {
  max-width: 46rem;
  margin-inline: auto;
  padding-inline: var(--page-gutter);
  padding-block: var(--space-3xl) var(--space-2xl);
}

/* Index-First opening: label + one short paragraph, no display type */
.intro { margin-block-end: var(--space-2xl); }
.intro__label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-neutral);
  margin: 0 0 var(--space-md);
}
.intro__lede {
  max-width: var(--measure);
  margin: 0;
  color: var(--color-muted);
  font-size: var(--text-md);
  line-height: 1.6;
}

/* ---------- the index ---------- */
.index {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: var(--rule-hair) solid var(--color-rule);
}
.index__row {
  display: grid;
  grid-template-columns: 3.5rem minmax(0, 1fr) auto;
  align-items: center;
  column-gap: var(--space-md);
  padding-block: var(--space-xl);
  border-bottom: var(--rule-hair) solid var(--color-rule);
  transition: background-color var(--dur-short) var(--ease-out);
}
.index__row:hover { background: var(--color-paper-2); }
.index__num {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-neutral);
  align-self: start;
  padding-block-start: var(--space-xs);
}
.index__body { min-width: 0; }
.index__name {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--text-display);
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin: 0 0 var(--space-xs);
  overflow-wrap: anywhere;
}
.index__name svg { flex: none; color: var(--color-neutral); }
.index__desc {
  max-width: var(--measure);
  margin: 0;
  color: var(--color-muted);
  font-size: var(--text-base);
}
.index__go {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2xs);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-neutral);
  white-space: nowrap;
  padding: var(--space-sm);
  transition: color var(--dur-micro) var(--ease-out);
}
.index__row:hover .index__go { color: var(--color-accent); }
.index__row:hover .index__go svg { transform: translate(2px, -2px); }
.index__go svg { transition: transform var(--dur-short) var(--ease-out); }

@media (max-width: 40rem) {
  .index__row {
    grid-template-columns: minmax(0, 1fr) auto;
    padding-block: var(--space-lg);
  }
  .index__num { display: none; }
  .index__name { font-size: var(--text-lg); }
}

/* ---------- Ft5 · statement footer ---------- */
.foot-stmt {
  padding-block: var(--space-2xl) var(--space-xl);
  display: grid;
  gap: var(--space-lg);
}
.foot-stmt__line {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.5rem, 1rem + 2vw, 2.25rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
  max-width: 28ch;
  margin: 0;
}
.foot-stmt__meta {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: var(--space-md);
  flex-wrap: wrap;
  padding-block-start: var(--space-sm);
  border-top: var(--rule-hair) solid var(--color-rule);
  font-size: var(--text-sm);
  color: var(--color-neutral);
}
.foot-stmt__meta .wordmark {
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--color-muted);
}