/* F Prime to Flight Faster — project page.
   Colors track the poster (R6 in docs/requirements.md): every hue that carries
   meaning is a Texas State brand color, named in a comment beside its value.

   Texas State Branding Colors
   https://brand.txst.edu/visual-identity/colors.html */

:root {
  /* Texas State Primary */
  --maroon: #501214;      /* Texas State Maroon */
  --dark-gold: #ac9155;   /* Texas State Dark Gold */
  --bright-gold: #d7bd8a; /* Texas State Bright Gold */

  /* Texas State Web-Exclusive */
  --charcoal: #363534;    /* body copy on light backgrounds only */
  --sandstone: #f5f1ee;   /* light background alternative to white */

  /* Semantic roles. Neutrals below — page white, muted grey, hairline rules —
     are structure rather than meaning and are exempt from the palette. */
  --accent: var(--maroon);
  --gold: var(--dark-gold);
  --ink: var(--charcoal);
  --muted: #5c5c5c;
  --page: #ffffff;
  --wash: var(--sandstone);
  --rule: #e1e0d9;
  --measure: 68rem;
}

/* Dark mode inverts the neutrals only. Maroon is too dark to read as link text
   on a dark field, so the accent moves to Bright Gold — still brand, and the
   maroon masthead keeps anchoring the page in both schemes. */
@media (prefers-color-scheme: dark) {
  :root {
    --accent: var(--bright-gold);
    --gold: var(--bright-gold);
    --ink: var(--sandstone);
    --muted: #a3a09c;
    --page: #171615;
    --wash: #211f1e;
    --rule: #38352f;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font-family: Inter, "Source Sans 3", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  font-size: 1.0625rem;
  line-height: 1.6;
}

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

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

h1, h2, h3 { line-height: 1.2; margin: 0; }

code {
  font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.9em;
  background: var(--wash);
  padding: 0.1em 0.35em;
  border-radius: 3px;
}

/* ---------------------------------------------------------------- masthead */

.masthead {
  background: var(--maroon);
  color: #fff;
  padding: 4rem 0 3.25rem;
  border-bottom: 6px solid var(--gold);
}

.masthead .eyebrow {
  margin: 0 0 1rem;
  font-size: 0.875rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.72);
}

.masthead h1 {
  font-size: clamp(2.25rem, 6vw, 3.75rem);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.subtitle {
  margin: 0.75rem 0 0;
  font-size: clamp(1.125rem, 2.6vw, 1.5rem);
  font-weight: 400;
  color: rgba(255, 255, 255, 0.9);
  max-width: 44ch;
}

.byline {
  margin: 1.75rem 0 0.25rem;
  font-weight: 600;
  font-size: 1.0625rem;
}

.affil {
  margin: 0;
  font-size: 0.9375rem;
  color: rgba(255, 255, 255, 0.7);
}

.cta {
  margin-top: 2rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.btn {
  display: inline-block;
  padding: 0.65rem 1.25rem;
  border-radius: 4px;
  border: 1px solid rgba(255, 255, 255, 0.45);
  color: #fff;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9375rem;
}

.btn:hover { border-color: #fff; background: rgba(255, 255, 255, 0.1); }

/* Maroon on gold rather than charcoal on gold: charcoal reads at 4.0:1 against
   Dark Gold, under AA for this size, and maroon clears it at 4.8:1. */
.btn-primary {
  background: var(--gold);
  border-color: var(--gold);
  color: var(--maroon);
}

.btn-primary:hover { background: var(--bright-gold); border-color: var(--bright-gold); }

.btn-small {
  padding: 0.4rem 0.85rem;
  font-size: 0.8125rem;
  border-color: var(--rule);
  color: var(--accent);
}

.btn-small:hover { background: var(--wash); border-color: var(--muted); }

/* ---------------------------------------------------------------- sections */

main section {
  padding: 3.5rem 0;
  border-bottom: 1px solid var(--rule);
}

main section:last-child { border-bottom: 0; }

main h2 {
  font-size: 1.5rem;
  letter-spacing: -0.01em;
  margin-bottom: 1.25rem;
}

main h2::after {
  content: "";
  display: block;
  width: 2.5rem;
  height: 3px;
  background: var(--gold);
  margin-top: 0.6rem;
}

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.section-head h2 { margin-bottom: 1.25rem; }

.abstract p { max-width: 72ch; }

.lede {
  max-width: 60ch;
  color: var(--muted);
  margin-top: -0.5rem;
}

.note {
  color: var(--muted);
  font-size: 0.9375rem;
}

/* ---------------------------------------------------------------- poster */

.poster-frame {
  display: block;
  margin-top: 0.5rem;
  border: 1px solid var(--rule);
  border-radius: 4px;
  overflow: hidden;
  background: #fff;
}

.poster-frame img {
  display: block;
  width: 100%;
  height: auto;
}

/* ---------------------------------------------------------------- cards */

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
  gap: 1.25rem;
}

.card {
  display: flex;
  flex-direction: column;
  padding: 1.5rem;
  border: 1px solid var(--rule);
  border-radius: 6px;
  background: var(--wash);
  color: inherit;
  text-decoration: none;
}

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

.card h3 { font-size: 1.125rem; }

.card p {
  margin: 0.6rem 0 1.25rem;
  color: var(--muted);
  font-size: 0.9375rem;
}

.card-link {
  margin-top: auto;
  font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.8125rem;
  color: var(--accent);
  overflow-wrap: anywhere;
}

/* ---------------------------------------------------------------- authors */

.person {
  padding: 1.5rem;
  border: 1px solid var(--rule);
  border-radius: 6px;
  text-align: center;
}

.person img {
  width: 7rem;
  height: 7rem;
  border-radius: 50%;
  object-fit: cover;
  margin-bottom: 1rem;
}

.person h3 { font-size: 1.125rem; }

.role {
  margin: 0.35rem 0 0.75rem;
  color: var(--muted);
  font-size: 0.9375rem;
}

.contact {
  margin: 0;
  font-size: 0.9375rem;
  overflow-wrap: anywhere;
}


/* ---------------------------------------------------------------- footer */

footer {
  background: var(--wash);
  border-top: 1px solid var(--rule);
  padding: 2.5rem 0;
  font-size: 0.9375rem;
}

footer p { margin: 0 0 0.4rem; }

.fine { color: var(--muted); font-size: 0.875rem; }