/* Layout: red social de tres columnas (navegación · feed · tu burbuja); en móvil, feed a pantalla completa con barra inferior. */
:root {
  --bg: #ffffff;
  --bg-soft: #f4f6f8;
  --fg: #0f1419;
  --muted: #59636e;
  --line: #e5e9ed;
  --accent: #2251ff;
  --accent-fg: #ffffff;
  --like: #e0245e;
  --repost: #00986a;
  --ok: #0e9f6e;
  --warn: #c98200;
  --bad: #d93025;

  --font-ui: "Figtree", "Segoe UI", system-ui, -apple-system, sans-serif;
  --font-display: "Bricolage Grotesque", "Figtree", "Segoe UI", system-ui, sans-serif;
  --font-read: "Newsreader", Georgia, "Times New Roman", serif;

  --head-h: 54px;
  --tab-h: 58px;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0b0d10; --bg-soft: #161a1f; --fg: #e8ecf0; --muted: #8b96a1; --line: #262c33;
    --accent: #6b8cff; --accent-fg: #0b0d10; --like: #ff4d82; --repost: #2fd39b; --ok: #34d399; --warn: #fbbf24; --bad: #ff6b5e;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0b0d10; --bg-soft: #161a1f; --fg: #e8ecf0; --muted: #8b96a1; --line: #262c33;
  --accent: #6b8cff; --accent-fg: #0b0d10; --like: #ff4d82; --repost: #2fd39b; --ok: #34d399; --warn: #fbbf24; --bad: #ff6b5e;
  color-scheme: dark;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 15px/1.45 var(--font-ui);
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3, p { margin: 0; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; }
svg { width: 24px; height: 24px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; flex: none; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 6px; }

/* ---------- estructura ---------- */
.app {
  display: grid;
  grid-template-columns: 250px minmax(0, 600px) 340px;
  justify-content: center;
  min-height: 100vh;
}

.sidenav {
  position: sticky; top: 0; height: 100vh;
  display: flex; flex-direction: column; gap: 28px;
  padding: 20px 20px 24px;
}
.brand { display: flex; align-items: center; gap: 10px; }
.brand-mark {
  width: 30px; height: 30px; border-radius: 50%; flex: none;
  border: 2.5px solid var(--fg); position: relative;
}
.brand-mark::after {
  content: ""; position: absolute; width: 9px; height: 9px; border-radius: 50%;
  background: var(--accent); top: 50%; left: 50%; transform: translate(-30%, -60%);
}
.brand-name { font: 800 19px/1.02 var(--font-display); letter-spacing: -0.02em; }

.nav { display: flex; flex-direction: column; gap: 2px; }
.nav a {
  display: flex; align-items: center; gap: 16px;
  padding: 11px 14px; border-radius: 999px; font-size: 18px;
}
.nav a:hover { background: var(--bg-soft); }
.nav a.active { font-weight: 700; }
.nav a.active svg { stroke-width: 2.4; }
.sidenav-note { margin-top: auto; font-size: 12.5px; color: var(--muted); max-width: 200px; }

.center { border-inline: 1px solid var(--line); min-width: 0; min-height: 100vh; }
.center-head {
  position: sticky; top: env(safe-area-inset-top, 0px); z-index: 5;
  height: var(--head-h);
  display: flex; align-items: center; gap: 12px;
  padding: 0 16px;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.center-head h1 { font: 700 19px/1 var(--font-ui); flex: 1; }
.brand-compact { display: none; }

.rail { position: sticky; top: 0; height: 100vh; overflow-y: auto; padding: 12px 20px 24px 24px; display: flex; flex-direction: column; gap: 16px; }
.rail-card { border: 1px solid var(--line); border-radius: 16px; padding: 16px; display: flex; flex-direction: column; gap: 10px; }
.rail-card h2 { font: 800 19px/1.2 var(--font-display); letter-spacing: -0.01em; }
.rail-head { display: flex; justify-content: space-between; align-items: baseline; }
.rail-head a { color: var(--accent); font-size: 14px; font-weight: 600; }

.tabbar { display: none; }

.pad { padding: 16px; }
.stack { display: flex; flex-direction: column; gap: 18px; }
.lede { color: var(--muted); font-size: 15px; }
.muted { color: var(--muted); font-size: 14px; }

/* ---------- botones ---------- */
.row-btns { display: flex; flex-wrap: wrap; gap: 8px; }
.btn {
  border: 1px solid var(--line); background: var(--bg); color: var(--fg);
  padding: 9px 16px; border-radius: 999px; font-weight: 600; font-size: 14.5px; cursor: pointer;
}
.btn:hover:not(:disabled) { background: var(--bg-soft); }
.btn-primary { background: var(--fg); color: var(--bg); border-color: var(--fg); }
.btn-primary:hover:not(:disabled) { background: var(--fg); opacity: .88; }
.btn-quiet { border-color: transparent; color: var(--muted); }
.btn:disabled { opacity: .45; cursor: default; }
.icon-btn {
  display: inline-grid; place-items: center; width: 34px; height: 34px; border-radius: 50%;
  border: 0; background: transparent; color: var(--muted); cursor: pointer; flex: none;
}
.icon-btn:hover { background: var(--bg-soft); color: var(--fg); }
.icon-btn svg { width: 19px; height: 19px; }

/* interruptor de modo claro / oscuro */
.theme-switch {
  --w: 36px; --h: 20px; --gap: 2.5px;
  flex: none; width: var(--w); height: var(--h); padding: 0; border-radius: 999px;
  border: 1.5px solid var(--line); background: var(--bg-soft); cursor: pointer;
}
.theme-switch-track { position: relative; display: block; width: 100%; height: 100%; }
.theme-switch-thumb {
  position: absolute; top: var(--gap); left: var(--gap);
  width: calc(var(--h) - 2 * var(--gap)); height: calc(var(--h) - 2 * var(--gap));
  border-radius: 50%; background: var(--fg);
  box-shadow: 0 1px 2px color-mix(in srgb, var(--fg) 30%, transparent);
  transition: transform .2s ease, background .2s ease;
}
.theme-switch[aria-checked="true"] { background: var(--accent); border-color: var(--accent); }
.theme-switch[aria-checked="true"] .theme-switch-thumb {
  transform: translateX(calc(var(--w) - var(--h)));
  background: var(--accent-fg);
}

/* ---------- aviso inicial ---------- */
.onboard {
  display: flex; gap: 12px; align-items: flex-start;
  margin: 12px 16px; padding: 14px 12px 14px 16px;
  background: var(--bg-soft); border-radius: 14px; font-size: 14.5px; color: var(--muted);
}
.onboard-title { color: var(--fg); font-weight: 700; margin-bottom: 2px; }
.onboard b { color: var(--fg); }

/* ---------- publicaciones ---------- */
.post { padding: 12px 16px; border-bottom: 1px solid var(--line); animation: rise .3s ease both; }
@keyframes rise { from { transform: translateY(8px); } to { transform: none; } }
.post-context { display: flex; align-items: center; gap: 6px; margin: 0 0 6px 52px; font-size: 13px; color: var(--muted); font-weight: 500; }
.post-context svg { width: 14px; height: 14px; stroke-width: 2.2; }
.post-context.explore { color: var(--accent); }
.post-row { display: grid; grid-template-columns: 40px minmax(0, 1fr); gap: 12px; }
.avatar {
  width: 40px; height: 40px; border-radius: 50%; display: grid; place-items: center;
  font-weight: 700; font-size: 14px; color: #ffffff; background: var(--av);
  letter-spacing: .02em;
}
.post-head { display: flex; align-items: center; gap: 4px; min-width: 0; font-size: 15px; }
.post-name { font-weight: 700; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.verified { width: 17px; height: 17px; fill: var(--accent); stroke: none; }
.post-meta { color: var(--muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; min-width: 0; }
.post-text { margin-top: 2px; font-size: 15.5px; line-height: 1.45; overflow-wrap: anywhere; }
.topic {
  display: inline-flex; align-items: center; gap: 6px; margin-top: 8px;
  font-size: 13px; font-weight: 600;
  color: color-mix(in oklab, var(--cat) 78%, var(--fg));
}
.topic::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--cat); }
.post-main { min-width: 0; }
.post-actions { position: relative; display: flex; gap: clamp(20px, 9vw, 64px); margin-top: 6px; margin-left: -8px; }

/* reacciones */
.act.react:hover { color: var(--accent); }
.react-emoji { font-size: 18px; line-height: 19px; width: 19px; text-align: center; animation: pulse .35s ease; }
.act.r-like { color: var(--accent); }
.act.r-love { color: var(--like); }
.act.r-haha, .act.r-wow, .act.r-sad { color: var(--warn); }
.act.r-angry { color: var(--bad); }
.act.r-dislike { color: var(--muted); }
.act[class*="r-"] { font-weight: 700; }
.picker {
  position: absolute; left: 0; bottom: calc(100% + 6px); z-index: 8;
  display: flex; align-items: center; gap: 2px; padding: 5px;
  background: var(--bg); border: 1px solid var(--line); border-radius: 999px;
  box-shadow: 0 8px 28px color-mix(in srgb, var(--fg) 18%, transparent);
  animation: pickerIn .18s ease;
}
.picker button {
  width: 40px; height: 40px; border: 0; background: none; cursor: pointer; border-radius: 50%;
  font-size: 26px; line-height: 1; display: grid; place-items: center;
  transition: transform .12s ease;
}
.picker button:hover, .picker button:focus-visible { transform: scale(1.25) translateY(-3px); }
.picker .neg { margin-left: 6px; position: relative; }
.picker .neg::before { content: ""; position: absolute; left: -5px; top: 9px; bottom: 9px; width: 1px; background: var(--line); }
@keyframes pickerIn { from { transform: translateY(6px) scale(.92); } to { transform: none; } }
@media (max-width: 400px) { .picker button { width: 36px; height: 36px; font-size: 23px; } }
.act {
  display: inline-flex; align-items: center; gap: 4px; border: 0; background: none; cursor: pointer;
  padding: 6px 8px; border-radius: 999px; color: var(--muted); font-size: 13px; font-variant-numeric: tabular-nums;
}
.act svg { width: 19px; height: 19px; }
.act:hover { color: var(--accent); background: color-mix(in srgb, var(--accent) 10%, transparent); }
.act.like:hover, .act.like.on { color: var(--like); }
.act.like:hover { background: color-mix(in srgb, var(--like) 10%, transparent); }
.act.like.on svg { fill: var(--like); stroke: var(--like); animation: pulse .35s ease; }
.act.repost:hover, .act.repost.on { color: var(--repost); }
.act.repost:hover { background: color-mix(in srgb, var(--repost) 10%, transparent); }
.act.repost.on svg { stroke-width: 2.6; animation: pulse .35s ease; }
@keyframes pulse { 50% { transform: scale(1.3); } }

/* menú de tres puntos */
.menu-wrap { position: relative; margin-left: auto; margin-right: -8px; }
.post-head .menu-wrap .icon-btn { width: 30px; height: 30px; }
.menu {
  position: absolute; right: 0; top: calc(100% + 4px); z-index: 8; min-width: 250px;
  background: var(--bg); border: 1px solid var(--line); border-radius: 14px; padding: 6px;
  box-shadow: 0 8px 28px color-mix(in srgb, var(--fg) 16%, transparent);
  display: flex; flex-direction: column;
}
.menu.up { top: auto; bottom: calc(100% + 4px); }
.menu button {
  display: flex; align-items: center; gap: 12px; width: 100%; text-align: left;
  border: 0; background: none; cursor: pointer; padding: 11px 12px; border-radius: 10px;
  font-size: 15px; font-weight: 600;
}
.menu button:hover { background: var(--bg-soft); }
.menu svg { width: 19px; height: 19px; }

.why-box {
  margin-top: 8px; padding: 10px 12px; border-radius: 12px;
  background: var(--bg-soft); color: var(--muted); font-size: 13.5px;
}

/* comentarios */
.replies { display: flex; flex-direction: column; gap: 10px; }
.replies:not(:empty) { margin-top: 10px; padding-top: 10px; border-top: 1px solid var(--line); }
.reply-item { display: grid; grid-template-columns: 30px minmax(0, 1fr); gap: 10px; font-size: 14.5px; }
.reply-item p { overflow-wrap: anywhere; }
.avatar-sm { width: 30px; height: 30px; font-size: 11px; color: var(--bg); }
.composer { margin-top: 10px; display: flex; flex-direction: column; gap: 8px; }
.composer textarea {
  width: 100%; resize: vertical; min-height: 64px; padding: 10px 12px;
  border: 1px solid var(--line); border-radius: 12px; background: var(--bg); color: var(--fg);
  font: inherit; font-size: 15px;
}
.composer textarea:focus { outline: none; border-color: var(--accent); }
.composer-foot { display: flex; justify-content: flex-end; gap: 6px; }
.composer .btn { padding: 7px 16px; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

.post.dismissed { padding: 16px; color: var(--muted); font-size: 14px; background: var(--bg-soft); }
.post.dismissed b { color: var(--fg); }

.empty { padding: 32px 16px 48px; text-align: center; color: var(--muted); border-top: 1px solid var(--line); }
.sentinel { padding: 28px 16px 40px; text-align: center; color: var(--muted); font-size: 14px; }

/* ---------- medidor de burbuja ---------- */
.bubble-pill {
  display: none; align-items: center; gap: 7px; padding: 5px 11px; border-radius: 999px;
  border: 1px solid var(--line); font-size: 13px; font-weight: 600; font-variant-numeric: tabular-nums;
}
.bubble-pill i { width: 8px; height: 8px; border-radius: 50%; background: currentColor; }
.ok { color: var(--ok); } .warn { color: var(--warn); } .bad { color: var(--bad); }

.meter-top { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.meter-num { font: 800 44px/1 var(--font-display); letter-spacing: -0.03em; font-variant-numeric: tabular-nums; }
.meter-state { font-weight: 700; font-size: 14px; display: inline-flex; align-items: center; gap: 6px; }
.meter-state::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: currentColor; }
.meter-track { position: relative; height: 6px; border-radius: 99px; background: var(--bg-soft); margin-top: 10px; overflow: hidden; }
.meter-fill { position: absolute; inset: 0 auto 0 0; border-radius: 99px; background: currentColor; transition: width .35s ease; }
.meter-scale { display: flex; justify-content: space-between; font-size: 11.5px; color: var(--muted); margin-top: 4px; }

.stats { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 8px; }
.stat { display: flex; flex-direction: column; }
.stat b { font-size: 18px; font-variant-numeric: tabular-nums; }
.stat span { font-size: 12px; color: var(--muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.rail .stats { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px 16px; padding: 12px 0; border-block: 1px solid var(--line); }
.rail .stat { flex-direction: row; align-items: baseline; gap: 6px; }
.rail .stat b { font-size: 17px; }
.rail .stat span { font-size: 13px; }

.section-label { font-size: 12px; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; color: var(--muted); }

.spark { width: 100%; height: 64px; display: block; overflow: visible; }
.spark-area { fill: color-mix(in srgb, var(--accent) 14%, transparent); stroke: none; }
.spark-line { fill: none; stroke: var(--accent); stroke-width: 2; vector-effect: non-scaling-stroke; stroke-linejoin: round; }
.spark-grid { stroke: var(--line); stroke-width: 1; vector-effect: non-scaling-stroke; }
.spark-axis { display: flex; justify-content: space-between; font-size: 11.5px; color: var(--muted); }

.bars { display: flex; flex-direction: column; gap: 7px; }
.bar { display: grid; grid-template-columns: minmax(0, 9.5em) minmax(0, 1fr) 3.2em; align-items: center; gap: 10px; font-size: 13.5px; }
.bar-name { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.bar-track { height: 8px; border-radius: 99px; background: var(--bg-soft); overflow: hidden; }
.bar-fill { display: block; height: 100%; border-radius: 99px; background: var(--cat); transition: width .35s ease; }
.bar-val { text-align: right; color: var(--muted); font-variant-numeric: tabular-nums; font-size: 12.5px; }

.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chip {
  font-size: 12.5px; font-weight: 600; padding: 3px 10px; border-radius: 999px;
  color: color-mix(in oklab, var(--cat) 78%, var(--fg));
  background: color-mix(in srgb, var(--cat) 12%, transparent);
}
.chip.gone { text-decoration: line-through; text-decoration-thickness: 1.5px; }

.bubble-block { display: flex; flex-direction: column; gap: 16px; }
.bubble-block .group { display: flex; flex-direction: column; gap: 8px; }

.explain { border-top: 1px solid var(--line); padding-top: 18px; display: flex; flex-direction: column; gap: 12px; }
.explain h2 { font: 800 20px/1.2 var(--font-display); letter-spacing: -0.01em; }
.steps { margin: 0; padding-left: 1.3em; display: flex; flex-direction: column; gap: 8px; color: var(--muted); }
.steps b { color: var(--fg); }
.fineprint { font-size: 13px; color: var(--muted); }

/* ---------- comparar ---------- */
.overlap { border: 1px solid var(--line); border-radius: 16px; padding: 16px; display: flex; flex-direction: column; gap: 6px; }
.overlap-row { display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap; }
.overlap-num { font: 800 44px/1 var(--font-display); letter-spacing: -0.03em; font-variant-numeric: tabular-nums; }
.overlap-label { color: var(--muted); font-size: 14px; }
.overlap-verdict { font-weight: 600; margin-top: 6px; }
.duo { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 14px; }
.duo-col { display: flex; flex-direction: column; gap: 14px; min-width: 0; }
.person { display: flex; gap: 10px; align-items: center; }
.person .avatar { width: 44px; height: 44px; font-size: 16px; }
.person h3 { font-size: 17px; font-weight: 700; }
.person p { font-size: 12.5px; color: var(--muted); }
.mini-meter { display: flex; align-items: baseline; gap: 8px; }
.mini-meter b { font: 800 28px/1 var(--font-display); font-variant-numeric: tabular-nums; }
.mini-meter span { font-size: 13px; font-weight: 700; }
.mini-feed { display: flex; flex-direction: column; border-top: 1px solid var(--line); }
.mini-post { padding: 9px 0; border-bottom: 1px solid var(--line); font-size: 13px; display: flex; flex-direction: column; gap: 3px; }
.mini-post p { display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.mini-post .topic { margin: 0; font-size: 11.5px; }
.duo .bar { grid-template-columns: minmax(0, 1fr) 3em; grid-template-rows: auto auto; row-gap: 3px; }
.duo .bar-track { grid-column: 1 / -1; grid-row: 2; }

/* ---------- modo Hayek ---------- */
.subtabs { display: flex; border-bottom: 1px solid var(--line); }
.subtab {
  flex: 1; border: 0; background: none; cursor: pointer; padding: 14px 0 0; font-weight: 500; color: var(--muted);
  display: flex; flex-direction: column; align-items: center; gap: 12px;
}
.subtab::after { content: ""; height: 4px; width: 56px; border-radius: 99px; background: transparent; }
.subtab[aria-selected="true"] { color: var(--fg); font-weight: 700; }
.subtab[aria-selected="true"]::after { background: var(--accent); }
.subtab:hover { background: var(--bg-soft); }

.essay { padding: 24px 20px 40px; display: flex; flex-direction: column; gap: 26px; }
.eyebrow { font-size: 12.5px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--accent); }
.essay-title { font: 800 clamp(28px, 6vw, 38px)/1.05 var(--font-display); letter-spacing: -0.03em; text-wrap: balance; margin-top: -14px; }
.essay-lede { font: 400 19px/1.55 var(--font-read); }
.concept { display: flex; flex-direction: column; gap: 8px; padding-top: 22px; border-top: 1px solid var(--line); }
.concept-src { font-size: 12.5px; color: var(--muted); font-style: italic; font-family: var(--font-read); font-size: 15px; }
.concept h3, .nuance h3, .proposal h3, .sources h3 { font: 800 22px/1.15 var(--font-display); letter-spacing: -0.015em; text-wrap: balance; }
.concept p:not(.concept-src), .nuance p { font: 400 17.5px/1.6 var(--font-read); }
.label { font-family: var(--font-ui); font-weight: 700; font-size: 13px; letter-spacing: .04em; text-transform: uppercase; margin-right: 4px; }
.concept-link { color: var(--accent); font-weight: 600; font-size: 14.5px; align-self: flex-start; }
.concept-link:hover { text-decoration: underline; }
.as-link { border: 0; background: none; padding: 0; cursor: pointer; }
.nuance { background: var(--bg-soft); border-radius: 16px; padding: 20px; display: flex; flex-direction: column; gap: 10px; }
.proposal, .sources { display: flex; flex-direction: column; gap: 12px; }
.principles { margin: 0; padding: 0; list-style: none; display: flex; flex-direction: column; gap: 12px; }
.principles li { padding-left: 18px; position: relative; font-size: 15.5px; color: var(--muted); }
.principles li::before { content: ""; position: absolute; left: 0; top: .55em; width: 7px; height: 7px; border-radius: 50%; background: var(--accent); }
.principles b { color: var(--fg); }
.sources ul { margin: 0; padding-left: 1.1em; color: var(--muted); display: flex; flex-direction: column; gap: 4px; font-size: 14.5px; }

.controls { display: flex; flex-direction: column; gap: 12px; }
.sliders { display: flex; flex-direction: column; gap: 2px; }
.slider-row { display: grid; grid-template-columns: minmax(0, 11em) minmax(0, 1fr) 2.2em; align-items: center; gap: 12px; font-size: 14px; min-height: 34px; }
.slider-name { display: flex; align-items: center; gap: 8px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.slider-name i { width: 9px; height: 9px; border-radius: 50%; background: var(--cat); flex: none; }
.slider-row input { width: 100%; accent-color: var(--cat, var(--accent)); }
.slider-row output { text-align: right; font-weight: 700; font-variant-numeric: tabular-nums; }
.slider-row.surprise { border-top: 1px solid var(--line); padding-top: 10px; font-weight: 600; }
.hayek-summary { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; padding: 14px 16px; border: 1px solid var(--line); border-radius: 16px; }
.hayek-summary .stat b { font-size: 22px; }

/* ---------- introducción ---------- */
body.intro-open { overflow: hidden; }
.intro {
  position: fixed; inset: 0; z-index: 50; overflow-y: auto;
  background: var(--bg);
  display: flex;
  padding: calc(32px + env(safe-area-inset-top, 0px)) 20px calc(32px + env(safe-area-inset-bottom, 0px));
  transition: opacity .45s ease, transform .45s ease;
}
.intro.leaving { opacity: 0; transform: translateY(-24px); pointer-events: none; }
.intro-inner {
  width: 100%; max-width: 1040px; margin: auto;
  display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); align-items: center; gap: 48px;
}
.intro-text { display: flex; flex-direction: column; align-items: flex-start; gap: 22px; min-width: 0; }
.intro-brand { display: inline-flex; align-items: center; gap: 10px; font: 800 17px/1 var(--font-display); letter-spacing: -0.01em; }
.intro-brand .brand-mark { width: 26px; height: 26px; }
.intro h1 {
  font: 800 clamp(34px, 6.2vw, 64px)/1.02 var(--font-display);
  letter-spacing: -0.035em; text-wrap: balance;
}
.intro-lede { font: 400 clamp(17px, 2.2vw, 20px)/1.55 var(--font-read); color: var(--muted); max-width: 34em; }
.intro-cta { display: inline-flex; align-items: center; gap: 10px; padding: 14px 24px; font-size: 16.5px; }
.intro-cta svg { width: 20px; height: 20px; transition: transform .2s ease; }
.intro-cta:hover svg { transform: translateX(4px); }
.intro-foot { font-size: 12.5px; color: var(--muted); }

/* órbita: los 12 temas girando alrededor de ti */
.intro-orbit { position: relative; width: min(100%, 380px); aspect-ratio: 1; max-width: 100%; justify-self: center; }
.intro-orbit::before, .intro-orbit::after {
  content: ""; position: absolute; border-radius: 50%; border: 1px dashed var(--line);
}
.intro-orbit::before { inset: 6%; }
.intro-orbit::after { inset: 26%; }
.orbit-ring { position: absolute; inset: 0; animation: spin 60s linear infinite; }
.orbit-ring.inner { inset: 20%; animation-direction: reverse; animation-duration: 45s; }
.orbit-arm { position: absolute; inset: 0; transform: rotate(var(--a)); }
.orbit-dot {
  position: absolute; left: 50%; top: 0; width: 10%; aspect-ratio: 1; border-radius: 50%;
  background: var(--cat); transform: translate(-50%, 0);
  box-shadow: 0 0 0 5px color-mix(in srgb, var(--cat) 18%, transparent);
}
.orbit-ring:not(.inner) .orbit-dot { top: 1%; width: 9%; }
.orbit-ring.inner .orbit-dot { top: 4%; width: 14%; }
.orbit-core {
  position: absolute; left: 50%; top: 50%; width: 22%; aspect-ratio: 1; transform: translate(-50%, -50%);
  border-radius: 50%; border: 3px solid var(--fg);
}
.orbit-core::after {
  content: ""; position: absolute; width: 30%; aspect-ratio: 1; border-radius: 50%; background: var(--accent);
  left: 50%; top: 50%; transform: translate(-30%, -60%);
}
@keyframes spin { to { transform: rotate(360deg); } }

@media (max-width: 760px) {
  .intro-inner { grid-template-columns: 1fr; gap: 24px; }
  .intro-orbit { order: -1; width: 200px; justify-self: start; }
  .intro-cta { width: 100%; justify-content: center; }
}

/* ---------- modo demostración ---------- */
.demo-tap {
  position: fixed; z-index: 100; width: 46px; height: 46px; margin: -23px 0 0 -23px;
  border-radius: 50%; pointer-events: none; opacity: 0;
  background: color-mix(in srgb, var(--fg) 22%, transparent);
  border: 2px solid color-mix(in srgb, var(--fg) 55%, transparent);
}
.demo-tap.go { animation: tap .6s ease-out; }
@keyframes tap {
  0% { opacity: 0; transform: scale(1.4); }
  30% { opacity: 1; transform: scale(.85); }
  100% { opacity: 0; transform: scale(1.2); }
}
body.demo { cursor: none; }

/* ---------- adaptable ---------- */
@media (max-width: 1180px) {
  .app { grid-template-columns: 84px minmax(0, 600px); }
  .rail { display: none; }
  .sidenav { align-items: center; padding-inline: 12px; }
  .brand-name, .nav a span, .sidenav-note { display: none; }
  .nav a { padding: 12px; }
  .bubble-pill { display: inline-flex; }
}
@media (max-width: 700px) {
  .app { display: block; }
  .sidenav { display: none; }
  .center { border: 0; padding-bottom: calc(var(--tab-h) + env(safe-area-inset-bottom, 0px)); }
  .brand-compact { display: flex; }
  .brand-compact .brand-mark { width: 26px; height: 26px; }
  .tabbar {
    display: grid; grid-template-columns: repeat(4, 1fr);
    position: fixed; left: 0; right: 0; bottom: 0; z-index: 10;
    padding-bottom: env(safe-area-inset-bottom, 0px);
    background: color-mix(in srgb, var(--bg) 92%, transparent);
    backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
    border-top: 1px solid var(--line);
  }
  .tabbar a { height: var(--tab-h); display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 2px; font-size: 11px; color: var(--muted); }
  .tabbar a.active { color: var(--fg); font-weight: 700; }
  .tabbar a.active svg { stroke-width: 2.4; }
  .essay { padding-inline: 16px; }
  .stats { grid-template-columns: repeat(2, minmax(0, 1fr)); row-gap: 12px; }
}
@media (max-width: 400px) {
  .slider-row { grid-template-columns: minmax(0, 8.5em) minmax(0, 1fr) 2em; gap: 8px; }
  .bar { grid-template-columns: minmax(0, 7.5em) minmax(0, 1fr) 3em; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}