/* demo/deck.css — dark tech: deep blue-black, neon gradients, glow. */
:root {
  --bg: #0a0e1a; --text: #e5e7eb; --muted: #94a3b8;
  --cyan: #22d3ee; --indigo: #818cf8; --pink: #f472b6;
  --green: #4ade80; --red: #f87171;
  --mono: ui-monospace, SFMono-Regular, Menlo, monospace;
}
* { box-sizing: border-box; }
/* No scroll-snap: pinned ScrollTrigger scenes need free scrolling. */
html { margin: 0; }
body { margin: 0; background: var(--bg); color: var(--text);
  font: 18px/1.6 -apple-system, "Segoe UI", Roboto, sans-serif; }

/* Fixed ambience layers behind all slides. */
.bg-grid { position: fixed; inset: 0; z-index: -2; pointer-events: none;
  background-image:
    linear-gradient(rgba(255,255,255,.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.025) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, black 40%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, black 40%, transparent 100%); }
.beam { position: fixed; top: 0; left: 50%; width: 2px; height: 100vh; z-index: -1;
  pointer-events: none;
  background: linear-gradient(180deg, transparent, rgba(34,211,238,.35) 15%,
    rgba(34,211,238,.10) 85%, transparent); }

/* Sections stack in normal flow; GSAP ScrollTrigger animates them on entry. */
.slide { min-height: 100vh; padding: 8vh 10vw 12vh; display: flex;
  flex-direction: column; justify-content: center; }
/* Word spans created by scroll.js for the hero 3D entrance. */
.hero-word { display: inline-block; will-change: transform; }
.slide h1 { perspective: 600px; }
/* .rise elements are revealed by GSAP (gsap.from); no CSS transitions here so
   the two systems never fight over the same properties. */

.kicker { font-size: 13px; letter-spacing: 3px; text-transform: uppercase; color: var(--cyan); }
h1 { font-size: clamp(36px, 6vw, 72px); line-height: 1.1; margin: .3em 0; font-weight: 800; }
.gradient { background: linear-gradient(90deg, var(--indigo), var(--cyan));
  -webkit-background-clip: text; background-clip: text; color: transparent; }
.sub { color: var(--muted); font-size: clamp(16px, 2vw, 22px); max-width: 60ch; }

.glow-card { background: rgba(255,255,255,.05); border: 1px solid rgba(129,140,248,.35);
  border-radius: 12px; padding: 18px 22px;
  box-shadow: 0 0 24px rgba(99,102,241,.15);
  transition: border-color .3s, box-shadow .3s; }
.glow-card:hover { border-color: rgba(34,211,238,.5); box-shadow: 0 0 32px rgba(34,211,238,.12); }
.code-card { background: #0d1220; border: 1px solid #1f2937; border-radius: 10px;
  padding: 14px 18px; font-family: var(--mono); font-size: 14px; line-height: 1.5;
  overflow-x: auto; white-space: pre; color: #c9d1d9; }

#progress { position: fixed; bottom: 0; left: 0; right: 0; height: 24px;
  display: flex; gap: 6px; padding: 9px 10vw; }
.seg { flex: 1; border-radius: 3px; background: rgba(255,255,255,.12); transition: background .3s; }
.seg.done { background: linear-gradient(90deg, var(--indigo), var(--cyan)); }

/* Slide 3: Architecture */
.arch { display: flex; align-items: center; gap: 14px; margin-top: 28px; flex-wrap: wrap; }
.node { border: 1px solid var(--c); border-radius: 12px; padding: 16px 20px; min-width: 150px;
  box-shadow: 0 0 22px color-mix(in srgb, var(--c) 30%, transparent);
  transition: box-shadow .3s; }
.node.lit { box-shadow: 0 0 36px color-mix(in srgb, var(--c) 55%, transparent); }
.node small { display: block; color: var(--muted); font-size: 13px; margin-top: 4px; }
.arrow { color: var(--muted); font-size: 24px; }

/* Slide 4: Dispatch Flow */
.steps { margin: 24px 0 0; padding-left: 24px; display: grid; gap: 12px; font-size: 19px; }
.steps b { color: var(--cyan); font-family: var(--mono); font-size: 16px; }

/* Slide 5: Epoch Fence Animation */
.fence { display: flex; align-items: center; gap: 28px; margin: 26px 0 10px; }
.wall { border: 2px solid var(--indigo); border-radius: 12px; padding: 18px 22px; text-align: center;
  font-family: var(--mono); box-shadow: 0 0 30px rgba(129,140,248,.4); }
.msg { font-family: var(--mono); font-size: 15px; padding: 10px 14px; border-radius: 8px; }
.msg.stale { border: 1px solid var(--red); color: var(--red); }
.msg.fresh { border: 1px solid var(--green); color: var(--green); }
/* Fence choreography (stale bounce-off, fresh pass-through) lives in scroll.js. */