/* ==========================================================================
   The Queenie Effect — Parent Brand Stylesheet
   Editorial-minimal. Restrained. Information-dense.
   See: prd/prd.md §11 Visual & Editorial System
   ========================================================================== */

/* ---------- Tokens ---------- */
:root {
  --bg:           #FAFAF7;   /* warm off-white surface */
  --bg-alt:       #F4F2EC;   /* secondary surface */
  --bg-dark:      #111111;   /* near-black surface */
  --text:         #1A1A1A;   /* near-black */
  --text-muted:   #6B6B6B;   /* secondary text */
  --text-subtle:  #9B9B9B;   /* tertiary text */
  --text-invert:  #FAFAF7;
  --border:       #E5E3DD;   /* hairlines */
  --border-dark:  #2A2A2A;
  --accent:       #B8460E;   /* burnt orange — restrained, not gold */

  --font-serif:   'Fraunces', 'Times New Roman', Georgia, serif;
  --font-sans:    'Inter', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;

  --max-w:        1200px;
  --max-w-narrow: 760px;
  --pad-x:        clamp(1.25rem, 4vw, 2.5rem);
  --pad-y:        clamp(3rem, 8vw, 6rem);
  --radius:       2px;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.55;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; }

/* ---------- Type ---------- */
h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-weight: 400;
  letter-spacing: -0.015em;
  margin: 0 0 0.4em;
  color: var(--text);
}
h1 { font-size: clamp(2.25rem, 5vw, 4rem);   line-height: 1.05; letter-spacing: -0.025em; }
h2 { font-size: clamp(1.75rem, 3.5vw, 2.5rem); line-height: 1.1; }
h3 { font-size: clamp(1.25rem, 2vw, 1.5rem);  line-height: 1.2; }
h4 { font-size: 1.05rem; line-height: 1.3; }
p  { margin: 0 0 1em; }
.eyebrow {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-weight: 500;
  color: var(--text-muted);
  margin: 0 0 1rem;
}
.lede { font-size: 1.15rem; color: var(--text-muted); line-height: 1.55; }
.muted { color: var(--text-muted); }
.subtle { color: var(--text-subtle); font-size: 0.875rem; }
.serif { font-family: var(--font-serif); }
hr { border: 0; border-top: 1px solid var(--border); margin: 0; }

/* ---------- Layout ---------- */
.container { max-width: var(--max-w); margin: 0 auto; padding-left: var(--pad-x); padding-right: var(--pad-x); }
.narrow { max-width: var(--max-w-narrow); margin: 0 auto; padding-left: var(--pad-x); padding-right: var(--pad-x); }
.section { padding-top: var(--pad-y); padding-bottom: var(--pad-y); }
.section--tight { padding-top: clamp(2rem, 5vw, 3.5rem); padding-bottom: clamp(2rem, 5vw, 3.5rem); }
.section--dark { background: var(--bg-dark); color: var(--text-invert); }
.section--dark h1, .section--dark h2, .section--dark h3, .section--dark h4 { color: var(--text-invert); }
.section--dark .muted { color: #9A9A9A; }
.section--alt { background: var(--bg-alt); }

.grid { display: grid; gap: 2rem; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 900px) { .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) { .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; } }

.row { display: flex; gap: 1rem; align-items: center; flex-wrap: wrap; }
.between { justify-content: space-between; }
.stack > * + * { margin-top: 1rem; }
.stack-lg > * + * { margin-top: 2rem; }

/* ---------- Header / Nav ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(250, 250, 247, 0.92);
  backdrop-filter: saturate(140%) blur(8px);
  border-bottom: 1px solid var(--border);
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  padding: 1rem 0;
}
.brand {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  letter-spacing: -0.01em;
  font-weight: 400;
}
.brand small {
  display: block;
  font-family: var(--font-sans);
  font-size: 0.65rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-top: 2px;
  font-weight: 500;
}
.nav-links {
  display: flex; gap: 1.75rem; align-items: center;
  font-size: 0.9rem;
}
.nav-links a:hover { color: var(--accent); }
.nav-cta {
  border: 1px solid var(--text);
  padding: 0.55rem 1rem;
  border-radius: var(--radius);
  font-size: 0.85rem;
  background: var(--text);
  color: var(--text-invert);
  transition: background 120ms;
}
.nav-cta:hover { background: var(--accent); border-color: var(--accent); }
@media (max-width: 760px) {
  .nav-links { display: none; }
  .nav-cta { padding: 0.45rem 0.85rem; font-size: 0.8rem; }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.85rem 1.4rem;
  font-size: 0.95rem;
  font-weight: 500;
  border: 1px solid var(--text);
  background: var(--text);
  color: var(--text-invert);
  border-radius: var(--radius);
  transition: background 120ms, border-color 120ms;
}
.btn:hover { background: var(--accent); border-color: var(--accent); }
.btn--ghost { background: transparent; color: var(--text); }
.btn--ghost:hover { background: var(--text); color: var(--text-invert); }
.btn--invert { background: var(--text-invert); color: var(--text); border-color: var(--text-invert); }
.btn--invert:hover { background: var(--accent); border-color: var(--accent); color: var(--text-invert); }
.btn--lg { padding: 1.05rem 1.75rem; font-size: 1rem; }

/* ---------- Hero ---------- */
.hero {
  padding-top: clamp(4rem, 9vw, 7rem);
  padding-bottom: clamp(4rem, 9vw, 7rem);
  border-bottom: 1px solid var(--border);
}
.hero h1 { max-width: 18ch; }
.hero .lede { max-width: 56ch; margin-top: 1.25rem; }

/* ---------- Forms ---------- */
.lead-form {
  display: flex; gap: 0.5rem; max-width: 480px; margin-top: 1.75rem;
}
.lead-form input[type="email"] {
  flex: 1;
  padding: 0.85rem 1rem;
  border: 1px solid var(--border);
  background: #fff;
  border-radius: var(--radius);
  font: inherit;
  color: var(--text);
}
.lead-form input[type="email"]:focus { outline: 2px solid var(--accent); outline-offset: 1px; border-color: var(--accent); }
.lead-form button { white-space: nowrap; }
.form-meta { font-size: 0.8rem; color: var(--text-subtle); margin-top: 0.6rem; }

/* ---------- Cards ---------- */
.card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  display: flex; flex-direction: column; gap: 0.75rem;
}
.card h3 { margin: 0; }
.card .meta {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-muted);
}
.card a.read { font-size: 0.9rem; color: var(--accent); margin-top: auto; }
.card a.read:hover { text-decoration: underline; }
.card--dark { background: #1B1B1B; border-color: var(--border-dark); color: var(--text-invert); }
.card--dark .meta { color: #B0B0B0; }

/* ---------- Pillars / Numbered list ---------- */
.pillar {
  border-top: 1px solid var(--border);
  padding-top: 1.5rem;
  display: grid; grid-template-columns: 60px 1fr; gap: 1.5rem;
}
.pillar .num {
  font-family: var(--font-serif);
  font-size: 2rem;
  color: var(--accent);
  line-height: 1;
}
.pillar h3 { margin: 0 0 0.5rem; }
@media (max-width: 600px) { .pillar { grid-template-columns: 1fr; } .pillar .num { font-size: 1.5rem; } }

/* ---------- Stats ---------- */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.stat { padding: 1.75rem; border-right: 1px solid var(--border); }
.stat:last-child { border-right: 0; }
.stat .num { font-family: var(--font-serif); font-size: 2.25rem; line-height: 1; display: block; margin-bottom: 0.4rem; }
.stat .label { font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.12em; color: var(--text-muted); }
@media (max-width: 760px) { .stats { grid-template-columns: repeat(2, 1fr); } .stat:nth-child(2n) { border-right: 0; } .stat:nth-child(-n+2) { border-bottom: 1px solid var(--border); } }

/* ---------- Tier ladder ---------- */
.tier {
  border: 1px solid var(--border);
  background: #fff;
  padding: 2rem;
  display: flex; flex-direction: column; gap: 1rem;
  border-radius: var(--radius);
}
.tier .price { font-family: var(--font-serif); font-size: 1.75rem; }
.tier ul { padding-left: 1.1rem; margin: 0.5rem 0 1rem; color: var(--text-muted); }
.tier ul li { margin-bottom: 0.35rem; }
.tier .btn { margin-top: auto; align-self: flex-start; }

/* ---------- Case study row ---------- */
.case-row {
  display: grid; grid-template-columns: 1fr 2fr 1fr; gap: 1.5rem;
  border-top: 1px solid var(--border);
  padding: 1.5rem 0;
  align-items: baseline;
}
.case-row:last-child { border-bottom: 1px solid var(--border); }
.case-row .name { font-family: var(--font-serif); font-size: 1.25rem; }
.case-row .delta { color: var(--accent); font-weight: 500; }
.case-row .meta { font-size: 0.8rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.1em; }
@media (max-width: 760px) { .case-row { grid-template-columns: 1fr; gap: 0.5rem; } }

/* ---------- Faculty card ---------- */
.faculty-card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 1.5rem; display: flex; flex-direction: column; gap: 0.75rem; }
.faculty-card .avatar {
  width: 72px; height: 72px; border-radius: 50%;
  background: var(--bg-alt);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-serif); font-size: 1.5rem; color: var(--text-muted);
  border: 1px solid var(--border);
}
.faculty-card h3 { margin: 0; }
.faculty-card .role { font-size: 0.85rem; color: var(--text-muted); }

/* ---------- FAQ / Disclosure ---------- */
details {
  border-top: 1px solid var(--border);
  padding: 1.25rem 0;
}
details:last-of-type { border-bottom: 1px solid var(--border); }
details summary {
  cursor: pointer;
  font-family: var(--font-serif);
  font-size: 1.15rem;
  list-style: none;
  display: flex; justify-content: space-between; align-items: center;
}
details summary::-webkit-details-marker { display: none; }
details summary::after { content: "+"; font-size: 1.5rem; color: var(--accent); transition: transform 200ms; }
details[open] summary::after { content: "−"; }
details > p { margin-top: 1rem; color: var(--text-muted); max-width: 70ch; }

/* ---------- Tags ---------- */
.tag {
  display: inline-block;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  padding: 0.2rem 0.55rem;
  border: 1px solid var(--border);
  border-radius: 100px;
  color: var(--text-muted);
  margin-right: 0.4rem;
}
.tag--accent { color: var(--accent); border-color: var(--accent); }

/* ---------- Footer ---------- */
.site-footer {
  background: var(--bg-dark);
  color: var(--text-invert);
  padding: 4rem 0 2rem;
  font-size: 0.875rem;
}
.site-footer .container { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 2rem; }
.site-footer h4 {
  font-family: var(--font-sans);
  text-transform: uppercase;
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: #9A9A9A;
  margin-bottom: 1rem;
  font-weight: 500;
}
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer li { margin-bottom: 0.55rem; }
.site-footer a { color: #D6D6D6; }
.site-footer a:hover { color: var(--accent); }
.site-footer .legal { grid-column: 1 / -1; border-top: 1px solid var(--border-dark); padding-top: 2rem; margin-top: 2rem; display: flex; justify-content: space-between; color: var(--text-subtle); font-size: 0.8rem; }
@media (max-width: 760px) { .site-footer .container { grid-template-columns: 1fr 1fr; } .site-footer .legal { flex-direction: column; gap: 0.5rem; } }

/* ---------- Misc ---------- */
.divider { height: 1px; background: var(--border); margin: var(--pad-y) 0; }
.kicker { color: var(--accent); font-weight: 500; }
.placeholder-img {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  color: var(--text-subtle);
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 0.9rem;
  aspect-ratio: 4/5;
  border-radius: var(--radius);
}
.placeholder-img--wide { aspect-ratio: 16/9; }

.banner {
  background: var(--accent);
  color: var(--text-invert);
  padding: 0.65rem var(--pad-x);
  text-align: center;
  font-size: 0.85rem;
  letter-spacing: 0.02em;
}
.banner a { text-decoration: underline; }