diff --git a/web/routes/temas/profundidad/+page.svelte b/web/routes/temas/profundidad/+page.svelte
new file mode 100644
index 000000000..3518a6972
--- /dev/null
+++ b/web/routes/temas/profundidad/+page.svelte
@@ -0,0 +1,344 @@
+<script lang="ts">
+	/**
+	 * Depth demo — the Eidos depth system, the novel "depth occurs" channel.
+	 *
+	 * Two moments, both live:
+	 *  - ESTADO: the 5 planes (`data-depth`) — the resting elevation (where an element *is*),
+	 *    composing surface + shadow + z. Toggle light/dark to see the mode-aware mix.
+	 *  - EVENTO: stamping `data-event-*` (as sema would during the hold) fires the firma —
+	 *    emerge → the shadow GROWS (rise); contact → it FLATTENS (recede). Depth *occurs*.
+	 *
+	 * Self-contained: imports the eidos foundation (planes + firma keyframes) + `data-theme`.
+	 */
+	import '@/uix/eidos/index.css'
+
+	let theme = $state<'light' | 'dark'>('dark')
+
+	const PLANES = [
+		{ id: 'flush', label: 'flush', note: 'a ras de superficie' },
+		{ id: 'raised', label: 'raised', note: 'tarjetas · reposo' },
+		{ id: 'overlay', label: 'overlay', note: 'menús · popovers' },
+		{ id: 'modal', label: 'modal', note: 'diálogos · cima' },
+		{ id: 'recessed', label: 'recessed', note: 'pozos · inputs' }
+	] as const
+
+	// ── Event moment: stamp data-event-* to fire the firma (as sema would) ──────
+	let targetPlane = $state<'raised' | 'overlay' | 'modal'>('overlay')
+	let evt = $state<{ event?: string; family?: string; phase?: string }>({})
+
+	function fire(next: { event?: string; family?: string }): void {
+		evt = {} // clear → lets the one-shot animation restart on re-trigger
+		requestAnimationFrame(() => {
+			evt = { ...next, phase: 'active' }
+		})
+	}
+	const fireEmerge = () => fire({ event: 'present' })
+	const firePress = () => fire({ family: 'contact' })
+</script>
+
+<svelte:head><title>Profundidad · Eidos</title></svelte:head>
+
+<div class="root" data-theme={theme}>
+	<header class="masthead">
+		<div class="mast-row">
+			<p class="kicker">Eidos · canal de profundidad</p>
+			<button class="theme-toggle" onclick={() => (theme = theme === 'light' ? 'dark' : 'light')}>
+				{theme === 'light' ? '◐ claro' : '◑ oscuro'}
+			</button>
+		</div>
+		<h1 class="mast-title">La profundidad <em>ocurre</em></h1>
+		<p class="mast-lede">
+			No es una propiedad que un elemento <i>tiene</i> — es algo que <i>sucede</i>. Un plano en
+			reposo (estado) <strong>y</strong> un ascenso al emerger (evento): los dos momentos, un solo
+			canal.
+		</p>
+	</header>
+
+	<!-- ── Planos (momento-estado) ────────────────────────────────────────── -->
+	<section class="section">
+		<div class="sec-head">
+			<h2 class="sec-title">Planos · momento-estado</h2>
+			<p class="sec-note">
+				<code>data-depth='{`{plane}`}'</code> — un nivel cohere superficie + sombra + z. La mezcla
+				es mode-aware (en dark, "más arriba" = más claro). Cambia el tema arriba.
+			</p>
+		</div>
+		<div class="planes">
+			{#each PLANES as p}
+				<div class="plane-cell">
+					<div
+						class="plane-card"
+						data-depth={p.id}
+						style="background: var(--depth-{p.id}-surface, var(--color-surface-default))"
+					></div>
+					<span class="plane-label">{p.label}</span>
+					<span class="plane-note">{p.note}</span>
+				</div>
+			{/each}
+		</div>
+	</section>
+
+	<!-- ── El evento (momento-evento) ─────────────────────────────────────── -->
+	<section class="section">
+		<div class="sec-head">
+			<h2 class="sec-title">El evento · momento-evento</h2>
+			<p class="sec-note">
+				La elevación vive en la <em>firma</em>: dispara un evento (como haría sema durante el
+				<code>hold</code>) y la sombra <strong>crece</strong> al emerger / se <strong>aplana</strong>
+				al presionar — coordinado con posición + escala desde un solo evento.
+			</p>
+		</div>
+
+		<div class="event-stage">
+			<div class="event-controls">
+				<div class="ctrl">
+					<span class="ctrl-label">plano de reposo</span>
+					<div class="chips">
+						{#each ['raised', 'overlay', 'modal'] as pl}
+							<button class="chip" data-on={targetPlane === pl} onclick={() => (targetPlane = pl as typeof targetPlane)}>{pl}</button>
+						{/each}
+					</div>
+				</div>
+				<div class="fire-row">
+					<button class="fire-btn" onclick={fireEmerge}>↑ emerge <small>(sube)</small></button>
+					<button class="fire-btn" onclick={firePress}>↓ contact <small>(recede)</small></button>
+				</div>
+			</div>
+
+			<div class="event-arena">
+				<div
+					class="event-target"
+					data-depth={targetPlane}
+					data-event={evt.event}
+					data-event-family={evt.family}
+					data-event-phase={evt.phase}
+					style="background: var(--depth-{targetPlane}-surface, var(--color-surface-overlay))"
+				>
+					<span class="target-glyph">↕</span>
+					<span class="target-text">dispárame</span>
+				</div>
+			</div>
+		</div>
+	</section>
+
+	<footer class="footnote">
+		<p>
+			<strong>Default fuerte, jaula abierta.</strong> El set de planos, su mezcla y la firma son
+			config-driven y anulables; los primitivos (<code>--shadow-*</code>, <code>z-index</code>,
+			<code>box-shadow</code> crudo) siguen a un paso. La capa eventful es <em>aditiva</em> sobre el
+			plano de reposo — un elemento <i>flush</i> no eleva nada; uno <i>raised</i> sube proporcional
+			a su plano. Y degrada con <code>prefers-reduced-motion</code>.
+		</p>
+	</footer>
+</div>
+
+<style>
+	.root {
+		min-block-size: 100vh;
+		background:
+			radial-gradient(120% 80% at 50% -10%, var(--color-surface-raised), transparent 60%),
+			var(--color-surface-default);
+		color: var(--color-content-primary);
+		font-family: var(--font-family-primary);
+		padding: clamp(1.5rem, 5vw, 5rem) clamp(1.25rem, 5vw, 6rem) 6rem;
+		--rule: color-mix(in srgb, var(--color-border-default) 100%, transparent);
+	}
+
+	.masthead {
+		max-inline-size: 56rem;
+		margin-block-end: clamp(3rem, 8vw, 6rem);
+	}
+	.mast-row {
+		display: flex;
+		align-items: center;
+		justify-content: space-between;
+		gap: 1rem;
+		margin-block-end: 2.5rem;
+	}
+	.kicker {
+		margin: 0;
+		font-family: var(--font-family-mono);
+		font-size: var(--font-size-xs);
+		letter-spacing: 0.18em;
+		text-transform: uppercase;
+		color: var(--color-content-muted);
+	}
+	.theme-toggle {
+		font-family: var(--font-family-mono);
+		font-size: var(--font-size-xs);
+		letter-spacing: 0.06em;
+		color: var(--color-content-secondary);
+		background: var(--color-surface-raised);
+		border: 1px solid var(--rule);
+		border-radius: 999px;
+		padding: 0.5rem 1rem;
+		cursor: pointer;
+	}
+	.theme-toggle:hover { color: var(--color-content-primary); }
+	.mast-title {
+		font-family: var(--font-family-display);
+		font-size: var(--font-size-xxxl);
+		font-weight: 600;
+		line-height: 1;
+		letter-spacing: -0.03em;
+		margin: 0 0 1.25rem;
+		text-wrap: balance;
+	}
+	.mast-title em { font-style: italic; color: var(--color-primary-text, var(--color-content-primary)); }
+	.mast-lede {
+		max-inline-size: 46ch;
+		font-size: var(--font-size-lg);
+		line-height: 1.5;
+		color: var(--color-content-secondary);
+		margin: 0;
+		text-wrap: pretty;
+	}
+	.mast-lede i { font-style: italic; }
+
+	.section { margin-block-end: clamp(3.5rem, 9vw, 7rem); }
+	.sec-head {
+		display: flex;
+		flex-wrap: wrap;
+		align-items: baseline;
+		gap: 0.75rem 2rem;
+		padding-block-end: 1.25rem;
+		margin-block-end: 2.5rem;
+		border-block-end: 1px solid var(--rule);
+	}
+	.sec-title {
+		font-family: var(--font-family-mono);
+		font-size: var(--font-size-xs);
+		font-weight: 500;
+		letter-spacing: 0.16em;
+		text-transform: uppercase;
+		margin: 0;
+	}
+	.sec-note {
+		margin: 0;
+		max-inline-size: 60ch;
+		font-size: var(--font-size-sm);
+		line-height: 1.55;
+		color: var(--color-content-muted);
+	}
+	code { font-family: var(--font-family-mono); font-size: 0.92em; color: var(--color-content-secondary); background: var(--color-surface-muted); padding: 0.1em 0.4em; border-radius: 4px; }
+	em { font-style: normal; color: var(--color-content-primary); font-weight: 500; }
+
+	/* Planes */
+	.planes {
+		display: grid;
+		grid-template-columns: repeat(auto-fit, minmax(min(100%, 9rem), 1fr));
+		gap: clamp(1.5rem, 4vw, 3rem);
+	}
+	.plane-cell { display: flex; flex-direction: column; align-items: center; gap: 1rem; }
+	.plane-card {
+		inline-size: 100%;
+		block-size: 7rem;
+		border-radius: var(--radius-lg);
+		/* hairline so `flush` (no shadow, surface = canvas) still reads as a flat tile */
+		border: 1px solid color-mix(in srgb, var(--rule) 70%, transparent);
+	}
+	.plane-label {
+		font-family: var(--font-family-mono);
+		font-size: var(--font-size-sm);
+		letter-spacing: 0.04em;
+		color: var(--color-content-primary);
+	}
+	.plane-note {
+		font-family: var(--font-family-mono);
+		font-size: var(--font-size-xs);
+		color: var(--color-content-muted);
+		text-align: center;
+	}
+
+	/* Event stage */
+	.event-stage {
+		display: grid;
+		grid-template-columns: minmax(0, 18rem) 1fr;
+		gap: clamp(1.5rem, 4vw, 3rem);
+		align-items: start;
+	}
+	@media (max-width: 720px) { .event-stage { grid-template-columns: 1fr; } }
+	.event-controls { display: flex; flex-direction: column; gap: 1.75rem; }
+	.ctrl { display: flex; flex-direction: column; gap: 0.7rem; }
+	.ctrl-label {
+		font-family: var(--font-family-mono);
+		font-size: var(--font-size-xs);
+		letter-spacing: 0.08em;
+		text-transform: uppercase;
+		color: var(--color-content-muted);
+	}
+	.chips { display: flex; flex-wrap: wrap; gap: 0.4rem; }
+	.chip {
+		font-family: var(--font-family-mono);
+		font-size: var(--font-size-xs);
+		color: var(--color-content-secondary);
+		background: var(--color-surface-raised);
+		border: 1px solid var(--rule);
+		border-radius: 7px;
+		padding: 0.35rem 0.7rem;
+		cursor: pointer;
+	}
+	.chip[data-on='true'] {
+		color: var(--color-primary-on-solid, #fff);
+		background: var(--color-primary-solid);
+		border-color: var(--color-primary-solid);
+	}
+	.fire-row { display: flex; flex-direction: column; gap: 0.6rem; }
+	.fire-btn {
+		font-family: var(--font-family-mono);
+		font-size: var(--font-size-sm);
+		color: var(--color-content-primary);
+		background: var(--color-surface-raised);
+		border: 1px solid var(--rule);
+		border-radius: var(--radius-md);
+		padding: 0.7rem 1rem;
+		cursor: pointer;
+		text-align: left;
+		transition: border-color 140ms;
+	}
+	.fire-btn small { color: var(--color-content-muted); }
+	.fire-btn:hover { border-color: var(--color-primary-solid); }
+
+	.event-arena {
+		display: grid;
+		place-items: center;
+		min-block-size: 18rem;
+		border-radius: var(--radius-lg);
+		background:
+			repeating-linear-gradient(45deg, transparent 0 13px, color-mix(in srgb, var(--rule) 45%, transparent) 13px 14px),
+			var(--color-surface-default);
+		border: 1px solid var(--rule);
+	}
+	.event-target {
+		inline-size: 11rem;
+		block-size: 7.5rem;
+		border-radius: var(--radius-lg);
+		display: flex;
+		flex-direction: column;
+		gap: 0.5rem;
+		align-items: center;
+		justify-content: center;
+	}
+	.target-glyph { font-size: var(--font-size-xl); color: var(--color-content-secondary); }
+	.target-text {
+		font-family: var(--font-family-mono);
+		font-size: var(--font-size-xs);
+		letter-spacing: 0.06em;
+		text-transform: uppercase;
+		color: var(--color-content-muted);
+	}
+
+	.footnote {
+		max-inline-size: 60rem;
+		padding-block-start: 2rem;
+		border-block-start: 1px solid var(--rule);
+	}
+	.footnote p {
+		margin: 0;
+		font-size: var(--font-size-sm);
+		line-height: 1.6;
+		color: var(--color-content-muted);
+		text-wrap: pretty;
+	}
+	.footnote i { font-style: italic; }
+</style>