/* ============================================================
   SLIDE — LEGACY FRAMING (Act 3 closer · two-column contrast)
   Reframes "legacy" as cost-of-safe-change, not age. Left side
   is a long-lived Java project that's calm and structured.
   Right side is a fast new AI-assisted codebase that risks
   becoming legacy fast. Stable / risky, no terminal, no
   "old technology" tropes.
   ============================================================ */
.s-legacy .body {
  position: absolute;
  inset: 56px 0 56px 0;
  padding: 44px var(--pad-x) 32px var(--pad-x);
  display: grid;
  grid-template-rows: auto 1fr auto;
  row-gap: 22px;
}

/* Header */
.s-legacy .lg-header { display: flex; flex-direction: column; gap: 10px; }
.s-legacy .lg-eyebrow {
  font-family: 'JetBrains Mono', monospace;
  font-size: 24px;
  color: var(--accent-ink);
  letter-spacing: 0.08em;
}
.s-legacy h2.lg-title {
  font-family: 'Inter', sans-serif;
  font-size: 56px;
  line-height: 1.04;
  font-weight: 800;
  letter-spacing: -0.025em;
  margin: 0;
  color: var(--fg);
  text-wrap: balance;
  max-width: 1640px;
}
.s-legacy .lg-title em {
  font-style: normal;
  color: var(--accent);
}

/* Two-column contrast. The risky column shares grid cell (col 2,
   row 1) with a ghost placeholder so step 0 has an anchor on the
   right half without forcing a layout shift on reveal. */
.s-legacy .lg-cols {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr;
  gap: 40px;
  min-height: 0;
}
.s-legacy .col-stable { grid-column: 1; grid-row: 1; }
.s-legacy .col-risky-ghost,
.s-legacy .col-risky { grid-column: 2; grid-row: 1; }

/* Ghost outline for the risky column. Dashed box only — no text,
   no label — so it anchors the right half without telegraphing
   what's coming. */
.s-legacy .col-risky-ghost {
  border: 1px dashed rgba(10, 21, 84, 0.18);
  background: transparent;
}

.s-legacy .lg-col {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 32px 40px 28px 40px;
  background: var(--bg-elev);
  border: 1px solid var(--line-strong);
  min-height: 0;
}

/* Calm side */
.s-legacy .col-stable {
  border: 1px solid rgba(10, 21, 84, 0.18);
}
.s-legacy .col-stable .col-eyebrow { color: var(--cyan-ink); }
.s-legacy .col-stable .ex-meta { color: var(--cyan-ink); border-color: rgba(8, 105, 120, 0.35); }
.s-legacy .col-stable .signals li::before { color: var(--cyan-ink); }
.s-legacy .col-stable .conc { color: var(--cyan-ink); }
.s-legacy .col-stable .conc .arrow { color: var(--cyan-ink); }

/* Risky side */
.s-legacy .col-risky {
  border: 2px solid var(--accent);
  background:
    linear-gradient(135deg,
      rgba(240, 42, 90, 0.07) 0%,
      rgba(225, 99, 9, 0.05) 100%),
    var(--bg-elev);
  box-shadow: 0 22px 60px rgba(240, 42, 90, 0.16);
}
.s-legacy .col-risky .col-eyebrow { color: var(--accent-ink); }
.s-legacy .col-risky .signals li::before { color: var(--accent); }
.s-legacy .col-risky .conc { color: var(--accent); }
.s-legacy .col-risky .conc .arrow { color: var(--accent); }
.s-legacy .col-risky .conc .hl { color: var(--accent); }

/* Column header */
.s-legacy .col-eyebrow {
  font-family: 'JetBrains Mono', monospace;
  font-size: 20px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-weight: 600;
}
.s-legacy .col-title {
  font-family: 'Inter', sans-serif;
  font-weight: 800;
  font-size: 56px;
  line-height: 1.0;
  letter-spacing: -0.025em;
  color: var(--fg);
  margin: 12px 0 0 0;
  text-wrap: balance;
}
.s-legacy .col-risky .col-title { color: var(--accent); }

/* Concrete examples (left side) */
.s-legacy .examples {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 18px 0 14px 0;
}
.s-legacy .ex {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 11px 16px;
  background: var(--bg);
  border: 1px solid var(--line-strong);
  font-family: 'JetBrains Mono', monospace;
}
.s-legacy .ex-name {
  color: var(--fg);
  font-weight: 600;
  font-size: 24px;
  letter-spacing: 0.01em;
}
.s-legacy .ex-meta {
  margin-left: auto;
  font-size: 20px;
  font-weight: 600;
  letter-spacing: 0.06em;
  padding: 2px 10px;
  border: 1px solid currentColor;
  border-radius: 999px;
  white-space: nowrap;
}

/* Signal lists */
.s-legacy .signals {
  list-style: none;
  margin: 18px 0 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.s-legacy .col-stable .signals { margin-top: 4px; }
.s-legacy .signals li {
  font-family: 'Inter', sans-serif;
  font-size: 32px;
  font-weight: 600;
  color: var(--fg);
  display: flex;
  align-items: baseline;
  gap: 18px;
  letter-spacing: -0.005em;
  line-height: 1.1;
}
.s-legacy .signals li::before {
  font-family: 'JetBrains Mono', monospace;
  font-weight: 700;
  font-size: 28px;
  width: 28px;
  display: inline-block;
  flex-shrink: 0;
}
.s-legacy .col-stable .signals li::before { content: "✓"; }
.s-legacy .col-risky .signals li::before { content: "↯"; }

/* Risk acceleration cue — fading vertical line + arrowhead that fills
   the empty space between the "Rapid throughput" signal at the top
   and the "Slop becomes legacy fast." conclusion at the bottom. The
   gradient ramps from near-transparent to solid pink so the trail
   reads as motion building up speed. */
.s-legacy .risk-accel {
  flex: 1 1 auto;
  min-height: 28px;
  margin: 12px 0 18px 13px;
  width: 3px;
  position: relative;
  background: linear-gradient(to bottom,
    rgba(240, 42, 90, 0.00) 0%,
    rgba(240, 42, 90, 0.30) 55%,
    rgba(240, 42, 90, 0.90) 100%);
  border-radius: 2px;
}
.s-legacy .risk-accel::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -2px;
  transform: translateX(-50%);
  width: 0; height: 0;
  border-top: 11px solid var(--accent);
  border-left: 8px solid transparent;
  border-right: 8px solid transparent;
}

/* Conclusion line — pinned at column bottom */
.s-legacy .conc {
  margin-top: auto;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  display: flex;
  align-items: baseline;
  gap: 16px;
  font-family: 'Inter', sans-serif;
  font-weight: 800;
  font-size: 36px;
  letter-spacing: -0.018em;
  line-height: 1.1;
}
.s-legacy .conc .arrow {
  font-family: 'JetBrains Mono', monospace;
  font-weight: 400;
  font-size: 36px;
}

/* Punchline */
.s-legacy .lg-punch {
  display: flex;
  align-items: baseline;
  gap: 32px;
  border-top: 1px solid var(--line);
  padding-top: 22px;
}
.s-legacy .lg-punch .main {
  font-family: 'Inter', sans-serif;
  font-weight: 800;
  font-size: 40px;
  letter-spacing: -0.018em;
  color: var(--fg);
  margin: 0;
  line-height: 1.1;
}
.s-legacy .lg-punch .main .hl { color: var(--accent); }
.s-legacy .lg-punch .sub {
  font-family: 'JetBrains Mono', monospace;
  font-size: 22px;
  color: var(--fg-mute);
  letter-spacing: 0.04em;
  margin-left: auto;
  white-space: nowrap;
}

/* Chromium's page.pdf() rasterises large-blur box-shadows as opaque
   rectangles, which turned the risky column's pink lift into a hard
   pink rectangle in the PDF. Drop the shadow in print; the 2px pink
   border + pink-tinted gradient still sell "risky". */
@media print {
  .s-legacy .col-risky { box-shadow: none; }
}

/* ============================================================
   Manual reveal — controlled by data-step on the active slide.
   Step 0 = "Legacy is not age." + STABLE column + ghost outline.
   Step 1 = title-2, RISKY column, and punchline all cross-fade
   together in a single synchronised beat. The ghost fades out
   on the same curve so the right half hands off cleanly.

   Hidden elements use opacity + visibility, not display, so the
   grid keeps its full geometry from step 0 — nothing shifts when
   the risky column lands.
   ============================================================ */
.s-legacy .lg-title .title-2,
.s-legacy .col-risky,
.s-legacy .lg-punch {
  opacity: 0;
  visibility: hidden;
  transition: opacity 520ms ease-out, visibility 0s 520ms;
}

.s-legacy[data-step="1"] .lg-title .title-2,
.s-legacy[data-step="1"] .col-risky,
.s-legacy[data-step="1"] .lg-punch {
  opacity: 1;
  visibility: visible;
  transition: opacity 520ms ease-out, visibility 0s 0s;
}

/* Ghost fades out on the same curve as the risky column fades in. */
.s-legacy .col-risky-ghost {
  opacity: 1;
  visibility: visible;
  transition: opacity 520ms ease-out, visibility 0s 0s;
}
.s-legacy[data-step="1"] .col-risky-ghost {
  opacity: 0;
  visibility: hidden;
  transition: opacity 520ms ease-out, visibility 0s 520ms;
}

@media (prefers-reduced-motion: reduce) {
  .s-legacy .lg-title .title-2,
  .s-legacy .col-risky,
  .s-legacy .col-risky-ghost,
  .s-legacy .lg-punch { transition: none; }
}