/* ===== Scroll storytelling ===== */
.story { position: relative; display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: 0 var(--s7); margin: 0 0 var(--s8); }
.story-stage { grid-column: 2; grid-row: 1; position: sticky; top: 56px; height: calc(100svh - 56px); display: flex; align-items: center; justify-content: center; z-index: 1; }
.stage-art { width: 100%; max-height: 100%; aspect-ratio: 4 / 3; border-radius: 28px; overflow: hidden;
  background: radial-gradient(120% 90% at 70% 20%, #17395F 0%, #0B1D35 55%, #071629 100%); border: 1px solid var(--line-night);
  box-shadow: 0 40px 80px -40px rgba(0,0,0,.6); }
.stage-art svg { width: 100%; height: 100%; display: block; }
.story-steps { grid-column: 1; grid-row: 1; position: relative; z-index: 2; }
.step { min-height: 74svh; display: flex; align-items: center; padding: var(--s8) 0; }
.step:first-child { min-height: 70svh; }
.step:last-child { min-height: 94svh; }
.step-card { max-width: 46ch; opacity: .6; transition: opacity .5s var(--ease); }
.step.is-active .step-card, .story-static .step-card { opacity: 1; }
.step-card .eyebrow { font-family: var(--f-head); font-weight: 700; font-size: var(--t-micro); color: var(--gold); margin-bottom: var(--s3); display: block; }
.paper .step-card .eyebrow { color: #8A6316; }
.step-card h3 { font-size: clamp(1.5rem, 1.1rem + 1.6vw, 2.35rem); letter-spacing: -0.025em; line-height: 1.1; margin-bottom: var(--s4); }
.step-card p { font-size: var(--t-body); }
.step-card .big { font-family: var(--f-head); font-weight: 800; font-size: clamp(2.6rem, 2rem + 2.6vw, 4.25rem); letter-spacing: -0.04em; line-height: 1; color: var(--gold); display: block; margin: var(--s3) 0; font-variant-numeric: tabular-nums; }
.paper .step-card .big { color: #7E5A14; }
.step-card .src { font-size: var(--t-micro); color: var(--on-night-3); }
.paper .step-card .src { color: #5A6B80; }
.story-static .story-stage { position: relative; top: 0; }

/* ===== Sección 8 como laboratorio ===== */
.lab { background:
  linear-gradient(rgba(98,200,245,.035) 1px, transparent 1px) 0 0 / 40px 40px,
  linear-gradient(90deg, rgba(98,200,245,.035) 1px, transparent 1px) 0 0 / 40px 40px,
  radial-gradient(1200px 700px at 80% 0%, rgba(23,57,95,.75), transparent 60%), var(--night); }
.lab .model-strip { border-top-color: var(--gold); border-bottom-color: var(--line-night); }
.lab .model-strip div + div { border-left-color: var(--line-night); }
.lab .model-strip .k { color: var(--on-night-2); }
.lab .model-strip div:nth-child(n+3) { border-top-color: var(--line-night); }
.lab .method { color: var(--on-night-2); }
.lab .method h4 { color: var(--on-night); }

/* ===== Cierre cinematográfico ===== */
.closing { isolation: isolate; }
#closingArt { position: absolute; inset: 0 0 auto 0; width: 100%; height: 58%; z-index: -1; opacity: .8; -webkit-mask-image: linear-gradient(to bottom, #000 70%, transparent); mask-image: linear-gradient(to bottom, #000 70%, transparent); }
.closing::after { content: ""; position: absolute; inset: 0; z-index: -1; background: radial-gradient(70% 60% at 50% 50%, transparent, rgba(7,22,41,.6) 70%, var(--night)); pointer-events: none; }

@media (max-width: 900px) {
  .story { grid-template-columns: minmax(0, 1fr); }
  .story-stage { grid-column: 1; align-items: flex-start; padding-top: var(--s3); }
  .stage-art { aspect-ratio: 4 / 3; width: min(100%, calc(52svh * 4 / 3)); max-height: none; }
  .story-steps { grid-column: 1; }
  .step { align-items: flex-end; padding: 0 0 8svh; }
  .step { min-height: 92svh; }
  .step:first-child { min-height: 96svh; }
  .step-card { opacity: 1; padding: var(--s5); border-radius: var(--r-l); background: rgba(7,22,41,.92); border: 1px solid var(--line-night); backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px); }
  .paper .step-card { background: rgba(246,248,252,.95); border-color: var(--line-paper); }
}

/* ===== Modo presentación ===== */
.mode-seg { margin-left: auto; padding: 3px; flex-wrap: nowrap; flex: none; }
.mode-seg button { min-height: 32px; padding: 4px 12px; font-size: .8rem; }
.topbar nav { margin-left: var(--s3); }
.topbar .toc { margin-left: 0; }
.mode-present .story, .mode-present .bridge, .mode-present .method, .mode-present .scroll-cue { display: none !important; }
.mode-present main { padding-bottom: 220px; }
.pm-focus { outline: 2px solid var(--gold); outline-offset: 10px; border-radius: 14px; }
.presenter { position: fixed; left: 50%; bottom: 16px; transform: translateX(-50%); z-index: 55; width: min(980px, calc(100% - 24px));
  display: grid; grid-template-columns: auto minmax(0, 1fr) auto; gap: var(--s5); align-items: center;
  padding: var(--s4) var(--s5); border-radius: 20px; background: rgba(10,29,53,.96); border: 1px solid rgba(214,172,85,.45); box-shadow: 0 20px 50px rgba(0,0,0,.45); color: var(--on-night); }
.presenter[hidden] { display: none; }
.pm-count { font-family: var(--f-head); font-weight: 800; font-size: 1.1rem; color: var(--gold); display: block; }
.pm-dots { display: flex; gap: 6px; margin-top: 8px; }
.pm-dots button { width: 10px; height: 10px; padding: 0; border-radius: 50%; border: 1px solid var(--on-night-3); background: transparent; cursor: pointer; }
.pm-dots button[aria-current="step"] { background: var(--gold); border-color: var(--gold); }
.pm-title { font-size: 1.05rem; margin-bottom: 4px; }
.pm-text { font-size: var(--t-small); color: var(--on-night-2); margin: 0; max-width: none; line-height: 1.45; }
.pm-ctl { display: flex; gap: 8px; align-items: center; }
.pm-ctl .btn { min-height: 42px; padding: 0 16px; }
.pm-ctl .btn:disabled { opacity: .4; cursor: not-allowed; }
.pm-exit { background: none; border: 0; color: var(--on-night-2); font-family: var(--f-head); font-weight: 600; font-size: .85rem; cursor: pointer; text-decoration: underline; padding: 8px; }
@media (max-width: 900px) {
  .mode-seg { margin-left: auto; }
  .mode-seg button { padding: 4px 9px; font-size: .74rem; }
  .toc-btn { margin-left: 8px; padding: 0 10px; }
  .brand > span { display: none; }
  .presenter { grid-template-columns: minmax(0, 1fr); gap: var(--s3); bottom: 8px; padding: var(--s4); }
  .pm-meta { display: flex; align-items: center; gap: var(--s4); }
  .pm-dots { margin-top: 0; }
  .pm-ctl .btn { flex: 1; justify-content: center; }
  .pm-focus { outline-offset: 4px; }
}

/* Diagrama institucional: los subtítulos no se pierden bajo las conexiones */
.arch .nd text { paint-order: stroke; stroke: var(--night); stroke-width: 5px; stroke-linejoin: round; }
.arch .nd.sel text.in { stroke: none; }
.arch .nd text.in { stroke: none; }
@media (max-width: 768px) { #chGoods { height: 760px; } #chBar { height: 640px; } }