/* ==========================================================================
   LLaDA-UI project page — layout.css
   Page chrome: sticky navigation, hero (with the denoising headline and the
   floating mask-token field), footer.
   ========================================================================== */

/* --------------------------------------------------------------------------
   Top navigation
   -------------------------------------------------------------------------- */

.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(247, 248, 252, 0.88);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.nav-inner {
  display: flex;
  align-items: center;
  gap: 20px;
  height: 60px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  color: var(--ink);
}
.brand:hover { text-decoration: none; }
.brand svg { width: 26px; height: 26px; }
.brand .ui { color: var(--indigo-bright); }

.nav-links {
  display: flex;
  gap: 2px;
  margin-left: auto;
}

.nav-links a {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--muted);
  padding: 7px 10px;
  border-radius: 8px;
}
.nav-links a:hover {
  color: var(--indigo);
  background: var(--tint);
  text-decoration: none;
}

.nav-gh {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--ink);
  border: 1px solid var(--line);
  background: var(--card);
  border-radius: 999px;
  padding: 7px 14px;
  white-space: nowrap;
}
.nav-gh:hover { border-color: var(--indigo-bright); text-decoration: none; }
.nav-gh svg { width: 15px; height: 15px; }
.nav-gh.disabled { color: var(--tbd-ink); border-style: dashed; cursor: default; }
.nav-gh.disabled:hover { border-color: var(--tbd-line); }

@media (max-width: 960px) {
  .nav-links { display: none; }
  .nav-gh { margin-left: auto; }
}

/* --------------------------------------------------------------------------
   Hero
   -------------------------------------------------------------------------- */

.hero {
  position: relative;
  overflow: hidden;
  padding: 84px 0 60px;
  background:
    radial-gradient(52rem 30rem at 50% -8rem, var(--tint) 0%, rgba(236, 239, 250, 0) 68%),
    radial-gradient(28rem 20rem at 90% 10rem, rgba(94, 131, 181, 0.16) 0%, rgba(94, 131, 181, 0) 70%),
    radial-gradient(24rem 18rem at 8% 16rem, rgba(224, 122, 95, 0.10) 0%, rgba(224, 122, 95, 0) 70%);
}

.hero-inner {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

/* Floating mask tokens — the page's signature glyph. Small rounded squares
   that pulse like unresolved [MASK] positions waiting to be committed. */
.mtoken {
  position: absolute;
  border-radius: 3px;
  opacity: 0.4;
  pointer-events: none;
  animation: dissolve 6s ease-in-out infinite;
}
.mtoken.steel { background: var(--steel); }
.mtoken.indigo { background: var(--indigo-bright); }
.mtoken.warm { background: var(--mask); }

@keyframes dissolve {
  0%, 100% { opacity: 0.14; transform: scale(0.82) rotate(0deg); }
  50% { opacity: 0.5; transform: scale(1.05) rotate(4deg); }
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--indigo);
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.eyebrow::before, .eyebrow::after { content: "▪"; color: var(--mask); font-size: 9px; }

.hero h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(3rem, 8vw, 5.2rem);
  line-height: 1.04;
  letter-spacing: -0.02em;
  margin: 16px 0 0;
}
.hero h1 .ui {
  background: linear-gradient(120deg, var(--indigo-bright), var(--indigo));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero .tagline {
  max-width: 760px;
  font-size: 18.5px;
  color: var(--muted);
  margin: 20px auto 0;
}
.hero .tagline strong { color: var(--ink); font-weight: 600; }

/* Denoising text: each token starts as an opaque mask block over its own
   glyphs (no layout shift), then resolves. Driven by main.js. */
[data-denoise] .dn {
  border-radius: 3px;
  transition: background-color 0.34s ease, color 0.34s ease;
}
[data-denoise] .dn.masked {
  color: transparent !important;
  background-color: var(--mask-soft);
  box-shadow: inset 0 0 0 1px rgba(224, 122, 95, 0.4);
}
.hero h1 .dn.masked {
  background-color: rgba(94, 131, 181, 0.32);
  box-shadow: inset 0 0 0 1px rgba(42, 75, 140, 0.28);
}

.authors {
  max-width: 860px;
  margin: 22px auto 0;
  font-size: 13.5px;
  line-height: 1.9;
  color: var(--ink);
}
.authors sup { color: var(--indigo-bright); font-family: var(--font-mono); font-size: 10px; }
.affils {
  margin: 6px auto 0;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--muted);
}
.affils sup { color: var(--indigo-bright); font-size: 9.5px; }
.author-note {
  margin: 4px auto 0;
  font-size: 12px;
  color: var(--muted);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-top: 28px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 15px;
  padding: 12px 22px;
  border-radius: 999px;
  border: 1px solid transparent;
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn svg { width: 17px; height: 17px; }

.btn-primary {
  background: linear-gradient(120deg, var(--indigo-bright), var(--indigo));
  color: #fff;
  box-shadow: 0 10px 24px -10px rgba(42, 75, 140, 0.55);
}
.btn-primary:hover { box-shadow: 0 14px 28px -10px rgba(42, 75, 140, 0.6); }

.btn-ghost {
  background: var(--card);
  color: var(--ink);
  border-color: var(--line);
}
.btn-ghost:hover { border-color: var(--indigo-bright); }

.btn-disabled {
  background: var(--tbd-bg);
  color: var(--tbd-ink);
  border: 1px dashed var(--tbd-line);
  cursor: default;
}
.btn-disabled:hover { transform: none; }

.hero-chips {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  margin-top: 22px;
}
.chip {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--indigo);
  background: var(--tint);
  border: 1px solid rgba(62, 108, 196, 0.28);
  border-radius: 999px;
  padding: 5px 13px;
}

/* Headline stat strip */
.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 12px;
  margin-top: 42px;
  width: 100%;
}
.stat {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px 14px 14px;
  text-align: center;
}
.stat .label {
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}
.stat .value {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 30px;
  line-height: 1.15;
  margin-top: 6px;
  color: var(--indigo);
}
.stat .note {
  font-size: 12px;
  color: var(--muted);
  margin-top: 3px;
}
.stat.highlight {
  border-color: rgba(224, 122, 95, 0.55);
  box-shadow: 0 10px 30px -18px rgba(224, 122, 95, 0.5);
}
.stat.highlight .value { color: #c05a39; }

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

.footer {
  margin-top: 40px;
  border-top: 1px solid var(--line);
  background: var(--tint);
  padding: 48px 0 32px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 32px;
}
@media (max-width: 780px) { .footer-grid { grid-template-columns: 1fr; } }

.footer .brand { font-size: 18px; }
.footer .foot-note { color: var(--muted); font-size: 14px; max-width: 400px; margin-top: 12px; }
.footer .corp-logo { width: 300px; max-width: 100%; margin-top: 18px; opacity: 0.9; }

.footer h4 {
  font-family: var(--font-mono);
  font-size: 11.5px;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--indigo);
  margin: 0 0 12px;
}
.footer ul { list-style: none; margin: 0; padding: 0; }
.footer li { margin-bottom: 8px; font-size: 14.5px; }
.footer li .tbd { margin-left: 6px; }

.footer-bottom {
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid rgba(42, 75, 140, 0.15);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--muted);
}