/* =====================================================================
   Strategic Decision-Making — hub stylesheet
   ---------------------------------------------------------------------
   Design identity: navy/paper/gold, Source Serif 4 for editorial weight.
   The homepage hero uses a themed illustration (currently: two competing
   forces linked by a price line) rather than an abstract graphic — the
   4-simulations grid still nods to the 2x2 payoff-matrix convention of
   game theory structurally (four cards, laid out as a quadrant).
   This is a separate visual identity from any individual simulation
   (each of which gets its own themed app) — the hub reads as a credible,
   editorial "faculty lab" site, not a game.
   ===================================================================== */

:root{
  --paper:#FAFAFA;
  --panel:#FFFFFF;
  --ink:#1B2340;
  --ink-dim:#5B6178;
  --line:#E4E4E9;
  --gold:#B8862E;
  --gold-bright:#D4A03C;
  --gold-tint:#F7EFDF;
  --navy-deep:#12172B;
  --radius:8px;
  --wrap:1120px;
}
*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
html,body{margin:0;padding:0;}
body{
  background:var(--paper);
  color:var(--ink);
  font-family:'Inter',sans-serif;
  -webkit-font-smoothing:antialiased;
  min-height:100vh;
}
h1,h2,h3,h4{
  font-family:'Source Serif 4',serif;
  font-weight:600;
  margin:0;
  color:var(--ink);
  line-height:1.15;
}
p{line-height:1.6; margin:0 0 1em;}
a{color:var(--gold);}
.wrap{max-width:var(--wrap); margin:0 auto; padding:0 24px;}
.dim{color:var(--ink-dim);}
.mono{font-family:'IBM Plex Mono',monospace;}
.eyebrow{
  font-family:'IBM Plex Mono',monospace;
  font-size:11px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--gold);
  margin-bottom:10px;
  display:block;
}
img{max-width:100%; display:block;}

/* ---------- nav ---------- */
.site-nav{
  border-bottom:1px solid var(--line);
  background:rgba(250,250,250,0.92);
  backdrop-filter:blur(6px);
  position:sticky; top:0; z-index:40;
}
.site-nav .wrap{
  display:flex; align-items:center; justify-content:space-between;
  height:72px;
}
.brand{
  display:flex; align-items:center; gap:10px;
  text-decoration:none; color:var(--ink);
}
.brand .mark{
  width:30px; height:30px; flex:none;
}
.brand .word{
  font-family:'Source Serif 4',serif; font-weight:600; font-size:18px;
  letter-spacing:-.01em;
}
.nav-links{ display:flex; align-items:center; gap:6px; }
.nav-links > a, .nav-links summary{
  font-size:14px; font-weight:600; color:var(--ink);
  text-decoration:none; padding:9px 14px; border-radius:6px;
  cursor:pointer; list-style:none;
}
.nav-links summary::-webkit-details-marker{ display:none; }
.nav-links summary::after{ content:"▾"; margin-left:5px; font-size:11px; color:var(--ink-dim); }
.nav-links > a:hover, .nav-links summary:hover{ background:rgba(27,35,64,0.05); }
.nav-links a.active{ color:var(--gold); }
details.nav-drop{ position:relative; }
details.nav-drop[open] summary{ background:rgba(27,35,64,0.05); }
.nav-drop .drop-panel{
  position:absolute; top:calc(100% + 8px); left:0;
  background:var(--panel); border:1px solid var(--line); border-radius:var(--radius);
  box-shadow:0 12px 32px rgba(18,23,43,0.10);
  min-width:280px; padding:8px; z-index:50;
}
.nav-drop .drop-panel a{
  display:block; padding:10px 12px; border-radius:6px;
  text-decoration:none; color:var(--ink);
}
.nav-drop .drop-panel a:hover{ background:var(--gold-tint); }
.nav-drop .drop-panel .t{ font-weight:700; font-size:14px; }
.nav-drop .drop-panel .d{ font-size:12px; color:var(--ink-dim); margin-top:1px; }
.nav-drop .drop-panel .soon{ font-family:'IBM Plex Mono',monospace; font-size:10px; letter-spacing:.05em; text-transform:uppercase; color:var(--ink-dim); }

/* close the <details> dropdown on outside click */
details.nav-drop[open] summary{ }

/* ---------- buttons ---------- */
.btn{
  display:inline-flex; align-items:center; gap:8px;
  font-family:'Inter',sans-serif; font-weight:700; font-size:15px;
  padding:13px 22px; border-radius:var(--radius);
  border:1px solid var(--ink); background:var(--ink); color:#fff;
  text-decoration:none; cursor:pointer;
  transition:background .15s ease, transform .12s ease, border-color .15s ease;
}
.btn:hover{ background:var(--navy-deep); }
.btn:active{ transform:translateY(1px); }
.btn.gold{ background:var(--gold); border-color:var(--gold); }
.btn.gold:hover{ background:var(--gold-bright); border-color:var(--gold-bright); }
.btn.ghost{ background:transparent; color:var(--ink); border-color:var(--line); }
.btn.ghost:hover{ border-color:var(--ink); background:rgba(27,35,64,0.04); }
.btn[disabled], .btn.disabled{ opacity:.45; cursor:not-allowed; pointer-events:none; }

/* ---------- hero ---------- */
.hero{ padding:76px 0 64px; }
.hero .grid{
  display:grid; grid-template-columns:1.1fr .9fr; gap:56px; align-items:center;
}
.hero h1{ font-size:44px; letter-spacing:-.01em; margin-bottom:18px; }
.hero .lede{ font-size:18px; color:var(--ink-dim); max-width:46ch; margin-bottom:30px; }
.hero .ctas{ display:flex; gap:12px; flex-wrap:wrap; }

/* ---------- matrix graphic (unused now that the hero uses a photo, kept for reference) ---------- */
.matrix-graphic{ width:100%; height:auto; }
.matrix-graphic .quad{ transition:opacity .2s ease; }
.hero-photo{
  width:100%; height:auto; display:block;
  border-radius:12px; border:1px solid var(--line);
  box-shadow:0 20px 48px rgba(27,35,64,0.14);
}

/* ---------- sections ---------- */
section{ padding:64px 0; }
section.alt{ background:var(--panel); border-top:1px solid var(--line); border-bottom:1px solid var(--line); }
.section-head{ max-width:640px; margin-bottom:40px; }
.section-head h2{ font-size:30px; margin-bottom:12px; }
.section-head p{ color:var(--ink-dim); font-size:16px; margin:0; }

/* ---------- steps ---------- */
.steps{ display:grid; grid-template-columns:repeat(3,1fr); gap:28px; }
.step{ border:1px solid var(--line); border-radius:var(--radius); padding:24px; background:var(--panel); }
.step .num{ font-family:'IBM Plex Mono',monospace; color:var(--gold); font-size:12px; letter-spacing:.1em; }
.step h3{ font-size:18px; margin:10px 0 8px; }
.step p{ color:var(--ink-dim); font-size:14px; margin:0; }

/* ---------- simulations grid (2x2 — echoes the payoff-matrix motif) ---------- */
.sim-grid{
  display:grid; grid-template-columns:1fr 1fr; gap:20px;
}
.sim-card{
  border:1px solid var(--line); border-radius:var(--radius); background:var(--panel);
  padding:26px; text-decoration:none; color:var(--ink); display:flex; flex-direction:column;
  min-height:200px; position:relative; overflow:hidden;
  transition:border-color .15s ease, box-shadow .15s ease;
}
.sim-card:hover{ border-color:var(--gold); box-shadow:0 10px 26px rgba(184,134,46,0.12); }
.sim-card.soon{ cursor:default; }
.sim-card.soon:hover{ border-color:var(--line); box-shadow:none; }
.sim-card .num{ font-family:'IBM Plex Mono',monospace; font-size:11px; color:var(--ink-dim); letter-spacing:.08em; margin-bottom:10px; }
.sim-card h3{ font-size:22px; margin-bottom:4px; }
.sim-card .theme{ font-family:'IBM Plex Mono',monospace; font-size:12px; color:var(--gold); letter-spacing:.03em; margin-bottom:12px; }
.sim-card.soon .theme{ color:var(--ink-dim); }
.sim-card p{ color:var(--ink-dim); font-size:14px; margin:0; flex:1; }
.sim-card .foot{ margin-top:16px; font-weight:700; font-size:13px; color:var(--ink); }
.sim-card.soon .foot{ color:var(--ink-dim); font-weight:600; }
.pill{
  display:inline-block; font-family:'IBM Plex Mono',monospace; font-size:10px;
  letter-spacing:.08em; text-transform:uppercase; padding:3px 8px; border-radius:20px;
  border:1px solid var(--line); color:var(--ink-dim); position:absolute; top:22px; right:22px;
}
.pill.live{ border-color:var(--gold); color:var(--gold); }

/* ---------- presentation page (simulation detail) ---------- */
.detail-hero{ padding:56px 0 40px; border-bottom:1px solid var(--line); }
.detail-hero h1{ font-size:38px; margin-bottom:8px; }
.detail-hero .theme-line{ font-family:'IBM Plex Mono',monospace; color:var(--gold); font-size:13px; letter-spacing:.04em; margin-bottom:20px; }
.detail-hero .lede{ font-size:17px; color:var(--ink-dim); max-width:60ch; margin-bottom:26px; }
.two-col{ display:grid; grid-template-columns:1fr 1fr; gap:40px; align-items:start; }
.card{ border:1px solid var(--line); border-radius:var(--radius); padding:26px; background:var(--panel); }
.dims{ list-style:none; margin:14px 0 0; padding:0; }
.dims li{ padding:10px 0; border-bottom:1px dashed var(--line); font-size:14px; }
.dims li:last-child{ border-bottom:none; }
.dims b{ color:var(--ink); }

/* ---------- author page ---------- */
.author-grid{ display:grid; grid-template-columns:220px 1fr; gap:44px; align-items:start; }
.author-photo{
  width:220px; height:220px; border-radius:50%; background:var(--gold-tint);
  border:1px solid var(--line); display:flex; align-items:center; justify-content:center;
  font-family:'Source Serif 4',serif; font-size:64px; color:var(--gold); font-weight:600;
  overflow:hidden;
}
.author-photo img{ width:100%; height:100%; object-fit:cover; display:block; }
.author-links{ display:flex; gap:10px; margin-top:18px; flex-wrap:wrap; }

/* ---------- form ---------- */
.form-row{ margin-bottom:16px; }
.form-row label{ display:block; font-size:12px; letter-spacing:.05em; color:var(--ink-dim); margin-bottom:6px; font-family:'IBM Plex Mono',monospace; text-transform:uppercase; }
.form-row input, .form-row textarea{
  width:100%; font-family:'Inter',sans-serif; font-size:15px; padding:11px 13px;
  border:1px solid var(--line); border-radius:var(--radius); background:var(--paper); color:var(--ink);
}
.form-row textarea{ min-height:120px; resize:vertical; }
.form-row input:focus, .form-row textarea:focus{ outline:2px solid var(--gold); outline-offset:1px; }
.form-note{ font-size:12px; color:var(--ink-dim); margin-top:10px; }
.form-success{ display:none; }

/* ---------- footer ---------- */
footer{ border-top:1px solid var(--line); padding:36px 0; }
footer .wrap{ display:flex; justify-content:space-between; align-items:center; flex-wrap:wrap; gap:12px; }
footer .flinks{ display:flex; gap:18px; }
footer a{ color:var(--ink-dim); text-decoration:none; font-size:13px; }
footer a:hover{ color:var(--ink); }
.small{ font-size:12px; }

/* ---------- responsive ---------- */
@media (max-width:860px){
  .hero .grid{ grid-template-columns:1fr; }
  .hero h1{ font-size:34px; }
  .steps{ grid-template-columns:1fr; }
  .sim-grid{ grid-template-columns:1fr; }
  .two-col{ grid-template-columns:1fr; }
  .author-grid{ grid-template-columns:1fr; }
  .author-photo{ width:140px; height:140px; font-size:42px; }
}
@media (max-width:600px){
  .site-nav .wrap{ height:auto; padding:14px 20px; flex-wrap:wrap; gap:10px; }
  .brand .word{ font-size:16px; }
  .nav-links{ gap:2px; }
  .nav-links > a, .nav-links summary{ padding:7px 10px; font-size:13px; }
}

/* ---------- reduced motion ---------- */
@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior:auto; }
  *{ transition:none !important; animation:none !important; }
}

/* ---------- focus visibility ---------- */
a:focus-visible, button:focus-visible, summary:focus-visible, input:focus-visible, textarea:focus-visible{
  outline:2px solid var(--gold); outline-offset:2px;
}