/* Shared look for Suture's public pages (landing, essays, MCAT). */
html, body { overflow-x: clip; }
html { scroll-behavior: smooth; }
.bg { position: fixed; inset: 0; z-index: -1; pointer-events: none; overflow: hidden; }
.bg::before, .bg::after { content: ""; position: absolute; width: 70vmax; height: 70vmax; border-radius: 50%; filter: blur(90px); opacity: .35; }
.bg::before { background: var(--violet); top: -35vmax; left: -20vmax; animation: drift 22s ease-in-out infinite alternate; }
.bg::after { background: color-mix(in srgb, var(--lime) 70%, var(--violet)); bottom: -45vmax; right: -25vmax; opacity: .16; animation: drift 28s ease-in-out infinite alternate-reverse; }
@keyframes drift { to { transform: translate(8vmax, 6vmax) scale(1.08); } }

.top { position: sticky; top: 0; z-index: 20; backdrop-filter: blur(14px); background: color-mix(in srgb, var(--bg) 72%, transparent);
  border-bottom: 1px solid color-mix(in srgb, var(--line) 70%, transparent); }
.top .in { max-width: 1080px; margin: 0 auto; padding: 12px 24px; display: flex; align-items: center; gap: 22px; }
.top nav { display: flex; gap: 20px; margin-left: auto; align-items: center; font-size: 14px; }
.top nav a { color: var(--muted); text-decoration: none; }
.top nav a:hover, .top nav a.on { color: var(--ink); }
.top nav a.signin { font-size: 13px; }
.top .cta { padding: 8px 14px; border-radius: 999px; background: var(--accent); color: var(--accent-ink) !important; font: 600 13px var(--font-ui); text-decoration: none; }
@media (max-width: 640px) { .top .in { padding: 10px 16px; gap: 12px; } .top nav { gap: 14px; } .top nav a.signin { display: none; } }

.wrap { max-width: 1080px; margin: 0 auto; padding: 0 24px; }
@media (max-width: 560px) { .wrap { padding: 0 16px; } }
section { padding: 72px 0 0; scroll-margin-top: 64px; }
.eyebrow { font: 600 12px var(--font-ui); text-transform: uppercase; letter-spacing: .14em; color: var(--accent); }
h1 { font-size: clamp(46px, 9vw, 96px); line-height: .95; margin: 14px 0 18px; }
h2 { font-size: clamp(32px, 5.6vw, 54px); line-height: 1.02; margin: 10px 0 16px; }
h3 { font-size: 23px; margin: 0 0 6px; }
p { margin: 0 0 12px; }
.muted { color: var(--muted); }
.lead { font-size: clamp(17px, 2.2vw, 20px); color: var(--muted); max-width: 640px; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 14px 20px; border-radius: 14px; font: 600 15px var(--font-ui);
  text-decoration: none; border: 1px solid var(--line); color: var(--ink); background: var(--panel); cursor: pointer; transition: transform .15s, box-shadow .2s; }
.btn:hover { transform: translateY(-1px); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); box-shadow: 0 10px 30px -10px color-mix(in srgb, var(--violet) 55%, transparent); }
.card { background: color-mix(in srgb, var(--panel) 88%, transparent); border: 1px solid var(--line); border-radius: 20px; padding: 22px; }

.rv { opacity: 0; transform: translateY(24px); transition: opacity .7s ease, transform .7s cubic-bezier(.2,.7,.2,1); }
.rv.in { opacity: 1; transform: none; }
.rv.d1 { transition-delay: .08s; } .rv.d2 { transition-delay: .16s; } .rv.d3 { transition-delay: .24s; }

/* tappable topic hub */
.hub { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 10px; }
@media (max-width: 900px) { .hub { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
.tile { text-align: left; padding: 16px 16px 18px; border-radius: 18px; border: 1px solid var(--line); cursor: pointer;
  background: color-mix(in srgb, var(--panel) 88%, transparent); color: var(--ink); display: flex; flex-direction: column; gap: 6px;
  transition: transform .15s, border-color .2s, background .2s; font: inherit; }
.tile:hover { transform: translateY(-2px); border-color: color-mix(in srgb, var(--accent) 50%, var(--line)); }
.tile .ic { font-size: 22px; line-height: 1; }
.tile b { font: 400 21px/1.1 var(--font-display); }
.tile span { font-size: 13px; color: var(--muted); }
.tile.on { border-color: var(--accent); background: linear-gradient(160deg, color-mix(in srgb, var(--violet) 24%, var(--panel)), var(--panel)); }
.panel { margin-top: 18px; scroll-margin-top: 70px; animation: pop .35s cubic-bezier(.2,.7,.2,1); }
@keyframes pop { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }
.panelhead { display: flex; align-items: center; gap: 12px; margin-bottom: 4px; }
.panelhead .back { margin-left: auto; font-size: 14px; background: none; border: 1px solid var(--line); border-radius: 999px; padding: 7px 12px; color: var(--muted); cursor: pointer; }
.panelnav { display: flex; justify-content: space-between; gap: 10px; margin-top: 18px; }

details { background: var(--panel); border: 1px solid var(--line); border-radius: 16px; padding: 16px 20px; margin-bottom: 10px; }
details summary { cursor: pointer; font-weight: 600; } details p { margin: 10px 0 0; color: var(--muted); }
footer { text-align: center; color: var(--muted); font-size: 12px; padding: 40px 24px; max-width: 760px; margin: 0 auto; }
@media (prefers-reduced-motion: reduce) { .rv { opacity: 1; transform: none; transition: none; } .bg::before, .bg::after { animation: none; }
  html { scroll-behavior: auto; } .panel { animation: none; } }