/* CranPM Studio — minimal academic landing page.
 * Palette aligned with the paper's RdYlBu_r choice: warm reds for accents,
 * cool blues for the navigation chrome, neutral greys for body text.
 */

:root {
  --c-bg: #ffffff;
  --c-band: #f7f8fa;
  --c-band-dark: #0e1726;
  --c-ink: #15212e;
  --c-mute: #5a6877;
  --c-accent: #b91c1c;       /* RdYlBu_r warm */
  --c-accent-2: #2d5fae;     /* cool counterpart */
  --c-border: #e6eaef;
  --c-link: #1d4ed8;
  --c-link-hover: #b91c1c;
  --r: 14px;
  --shadow: 0 1px 2px rgba(15, 23, 42, 0.05),
            0 6px 18px rgba(15, 23, 42, 0.05);
  --font-body: ui-sans-serif, system-ui, -apple-system, "Segoe UI",
               Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco,
               "Cascadia Mono", Consolas, monospace;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  background: var(--c-bg);
  color: var(--c-ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--c-link); text-decoration: none; }
a:hover { color: var(--c-link-hover); text-decoration: underline; }

.wrap { max-width: 1180px; margin: 0 auto; padding: 0 26px; }
.narrow { max-width: 820px; }

h1, h2, h3 { letter-spacing: -0.01em; }
h1 { font-size: 2.6rem; margin: 8px 0 6px; line-height: 1.1; }
h2 { font-size: 1.6rem; margin: 0 0 14px; }
h3 { font-size: 1.05rem; margin: 0 0 6px; }

code { font-family: var(--font-mono); font-size: 0.92em; }
pre {
  background: #0e1726; color: #e6eaef; padding: 14px 16px;
  border-radius: 10px; overflow-x: auto; font-size: 0.85rem;
}
pre code { color: inherit; }

/* ─────────── Topbar ─────────── */
.topbar {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,0.92);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--c-border);
}
.topbar-row {
  display: flex; align-items: center; justify-content: space-between;
  height: 60px;
}
.brand { display: flex; gap: 10px; align-items: center; font-weight: 700; }
.brand:hover { text-decoration: none; }
.brand-mark {
  width: 22px; height: 22px; border-radius: 6px;
  background: linear-gradient(135deg, var(--c-accent) 0%, var(--c-accent-2) 100%);
  box-shadow: 0 0 0 2px white inset;
}
.brand-text { color: var(--c-ink); font-size: 1.05rem; }
.brand-text em { color: var(--c-accent); font-style: italic; font-weight: 600; }

.nav { display: flex; gap: 22px; }
.nav a { color: var(--c-mute); font-size: 0.95rem; font-weight: 500; }
.nav a:hover { color: var(--c-accent); text-decoration: none; }

/* ─────────── Hero ─────────── */
.hero {
  padding: 64px 0 56px;
  background: radial-gradient(1200px 600px at 20% -20%,
              rgba(45,95,174,0.10), transparent 60%),
              radial-gradient(900px 500px at 90% 10%,
              rgba(185,28,28,0.08), transparent 60%);
}
.hero-grid {
  display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 48px;
  align-items: center;
}
.kicker {
  text-transform: uppercase; letter-spacing: 0.18em;
  font-size: 0.78rem; color: var(--c-accent); font-weight: 700;
  margin: 0 0 4px;
}
.hero h1 { letter-spacing: -0.02em; font-size: 3rem; }
.tag {
  font-size: 1.25rem; color: var(--c-ink); margin: 4px 0 18px;
  font-weight: 500; line-height: 1.35;
}
.lede {
  color: var(--c-ink); font-size: 1.02rem; max-width: 56ch;
  margin: 0 0 22px;
}
.cta { display: flex; gap: 12px; margin-bottom: 22px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 11px 18px; border-radius: 9px;
  font-weight: 600; font-size: 0.96rem;
  transition: transform 0.08s ease, box-shadow 0.12s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary {
  background: var(--c-accent); color: white;
  box-shadow: 0 4px 14px rgba(185,28,28,0.25);
}
.btn-primary:hover {
  background: #a31515; color: white;
  box-shadow: 0 6px 16px rgba(185,28,28,0.30);
}
.btn-ghost {
  border: 1px solid var(--c-border); color: var(--c-ink);
  background: rgba(255,255,255,0.7);
}
.btn-ghost:hover { border-color: var(--c-accent); color: var(--c-accent); }

.badges {
  list-style: none; padding: 0; margin: 6px 0 0;
  display: flex; flex-direction: column; gap: 6px;
  font-size: 0.92rem; color: var(--c-mute);
}
.badges li span {
  display: inline-block; background: var(--c-band);
  border: 1px solid var(--c-border); border-radius: 6px;
  padding: 1px 8px; margin-right: 8px; font-weight: 600;
  color: var(--c-accent-2);
}

.hero-art img {
  width: 100%; border-radius: var(--r); box-shadow: var(--shadow);
  background: white;
}
.hero-art .cap {
  font-size: 0.85rem; color: var(--c-mute); margin-top: 8px;
  text-align: center;
}

/* ─────────── Bands ─────────── */
.band { padding: 56px 0; }
.band-light { background: var(--c-band); }
.band-dark { background: var(--c-band-dark); color: #e6eaef; }
.band-dark h2, .band-dark h3 { color: white; }
.band-dark a { color: #93c5fd; }
.band-dark a:hover { color: #fca5a5; }

.centered-text { text-align: center; max-width: 60ch; margin: 0 auto 26px; }
.small { font-size: 0.86rem; color: var(--c-mute); }

/* ─────────── Authors ─────────── */
.authors h2 { margin-bottom: 8px; }
.author-list {
  list-style: none; padding: 0;
  display: flex; flex-wrap: wrap; gap: 14px 22px;
  margin: 8px 0 16px; font-size: 0.98rem;
}
.author-list strong { font-weight: 600; }
.author-list .email {
  color: var(--c-mute); margin-left: 4px; font-size: 0.85rem;
}
.author-list .badge {
  background: var(--c-accent); color: white; font-size: 0.7rem;
  border-radius: 3px; padding: 2px 6px; margin-left: 6px;
  text-transform: uppercase; letter-spacing: 0.08em;
}
.affil-list {
  list-style: none; padding: 0; margin: 6px 0 0;
  font-size: 0.88rem; color: var(--c-mute); line-height: 1.7;
}
.affil-list li { padding-left: 0; }

/* ─────────── Demo iframe ─────────── */
.demo-frame {
  background: black; border-radius: var(--r);
  border: 1px solid #243248; overflow: hidden;
  box-shadow: var(--shadow);
  margin: 8px 0 14px;
}
.demo-frame iframe {
  width: 100%; height: 760px; border: 0; display: block;
  background: #1b2536;
}

/* ─────────── Figures gallery ─────────── */
.grid-figs {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
}
.card {
  display: block; background: white; color: var(--c-ink);
  border: 1px solid var(--c-border); border-radius: var(--r);
  overflow: hidden; box-shadow: var(--shadow);
  transition: transform 0.08s ease, box-shadow 0.12s ease;
}
.card:hover {
  text-decoration: none; transform: translateY(-2px);
  box-shadow: 0 2px 4px rgba(15,23,42,0.06),
              0 10px 28px rgba(15,23,42,0.10);
  border-color: #d6dde5;
}
.card img {
  width: 100%; display: block; aspect-ratio: 16/10;
  object-fit: cover; background: var(--c-band);
}
.card-body { padding: 12px 14px; }
.card-body h3 { color: var(--c-accent); margin-bottom: 4px; }
.card-body p { font-size: 0.9rem; color: var(--c-mute); margin: 0; }

/* ─────────── Code & data grid ─────────── */
.grid-2 {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
  margin-top: 12px;
}
.grid-2 h3 {
  color: var(--c-accent-2); font-size: 1rem; margin-bottom: 8px;
}
.links { list-style: none; padding: 0; margin: 0; }
.links li { padding: 4px 0; font-size: 0.95rem; }
.links pre {
  margin-top: 8px; font-size: 0.78rem; padding: 10px 12px;
}

/* ─────────── Footer ─────────── */
.foot {
  border-top: 1px solid var(--c-border);
  background: white; padding: 22px 0;
}
.foot-row {
  display: flex; justify-content: space-between;
  flex-wrap: wrap; gap: 12px;
  font-size: 0.86rem; color: var(--c-mute);
}
.links-sep a { margin: 0 6px; }

/* ─────────── Mobile ─────────── */
@media (max-width: 760px) {
  .nav { display: none; }
  .hero { padding: 36px 0 32px; }
  .hero-grid { grid-template-columns: 1fr; gap: 24px; }
  .hero h1 { font-size: 2.1rem; }
  .tag { font-size: 1.06rem; }
  .demo-frame iframe { height: 560px; }
  .band { padding: 40px 0; }
}