/* Scene 7 — Transposed convolution: filter slides, input stamps.
   Strided input (zero-inserted) above; the filter overlay slides over it;
   output below shows stamps accumulating. */

.s7-root { padding: 0 24px 32px; }
.s7-wrap {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 22px;
}

/* ---- Hero ----------------------------------------------------------- */
.s7-hero h1 { margin-bottom: 4px; }
.s7-hero .subtitle {
  max-width: 920px;
  font-style: italic;
  color: var(--ink-secondary);
  margin: 0;
}

.s7-mini-host { align-self: flex-start; }

/* ---- Cheat-sheet --------------------------------------------------- */
.s7-cheat {
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 12px 16px;
  background: var(--bg);
  border: 1px solid var(--rule);
  border-radius: 4px;
  flex-wrap: wrap;
  font-family: "SF Mono", Menlo, monospace;
  font-size: 12px;
}
.s7-cheat-item { display: flex; align-items: baseline; gap: 6px; }
.s7-cheat-k { color: var(--ink-secondary); }
.s7-cheat-v { color: var(--ink); font-weight: 600; }
.s7-cheat-v-em { color: var(--accent, #d97a1f); }
.s7-cheat-formula {
  margin-left: auto;
  color: var(--ink-secondary);
  font-style: italic;
}

/* ---- Knobs --------------------------------------------------------- */
.s7-knobs {
  display: flex;
  gap: 22px;
  align-items: center;
  flex-wrap: wrap;
  padding: 10px 14px;
  background: var(--card-bg);
  border: 1px solid var(--rule);
  border-radius: 4px;
}
.s7-knob { display: flex; align-items: center; gap: 8px; }
.s7-knob-label {
  font-size: 11px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-secondary);
  font-family: "SF Mono", Menlo, monospace;
}
.s7-knob-btn {
  font-family: "SF Mono", Menlo, monospace;
  font-size: 12px;
  padding: 5px 12px;
  background: var(--bg);
  color: var(--ink);
  border: 1px solid var(--rule);
  border-radius: 3px;
  cursor: pointer;
  min-width: 32px;
  transition: background 0.12s;
}
.s7-knob-btn:hover { background: var(--card-bg); }
.s7-knob-btn.s7-active {
  background: var(--accent, #d97a1f);
  color: var(--bg);
  border-color: var(--accent, #d97a1f);
  font-weight: 600;
}

/* ---- Main panel ---------------------------------------------------- */
.s7-panel {
  background: var(--card-bg);
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: 18px 20px;
}
.s7-panel-title {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 14px;
}
.s7-panel-eyebrow {
  font-size: 11px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--ink-secondary);
  font-family: "SF Mono", Menlo, monospace;
}
.s7-panel-progress {
  font-size: 12px;
  color: var(--accent, #d97a1f);
  font-family: "SF Mono", Menlo, monospace;
}

.s7-row {
  display: flex;
  justify-content: center;
  margin: 4px 0;
}
.s7-row-inputs {
  align-items: stretch;
  gap: 0;
  flex-wrap: wrap;
}
.s7-side-arrow {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 0 18px;
  /* Pull arrow column down so it aligns with the canvas, not the cap. */
  margin-top: 22px;
}
.s7-side-arrow-glyph {
  font-size: 32px;
  line-height: 1;
  color: var(--accent, #d97a1f);
  font-family: "SF Mono", Menlo, monospace;
}
.s7-side-arrow-text {
  font-size: 11px;
  color: var(--ink-secondary);
  font-family: "SF Mono", Menlo, monospace;
  letter-spacing: 0.04em;
  text-align: center;
  max-width: 130px;
}
.s7-col {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}
.s7-col-cap {
  font-size: 12px;
  font-family: "SF Mono", Menlo, monospace;
  color: var(--ink);
  font-weight: 600;
  text-align: center;
}
.s7-col-sub {
  font-size: 11px;
  color: var(--ink-secondary);
  font-style: italic;
  max-width: 540px;
  text-align: center;
  margin-top: 2px;
}
.s7-canvas-host {
  border: 1px solid var(--rule);
  border-radius: 3px;
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
}
.s7-canvas-host canvas { display: block; }
.s7-out-host { background: var(--bg); }

.s7-down-arrow {
  text-align: center;
  font-family: "SF Mono", Menlo, monospace;
  font-size: 13px;
  color: var(--accent, #d97a1f);
  margin: 14px 0 6px;
  letter-spacing: 0.04em;
}

/* ---- Narration ---------------------------------------------------- */
.s7-narration {
  background: var(--bg);
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: 14px 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.s7-narration-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
  font-family: "SF Mono", Menlo, monospace;
}
.s7-narration-body {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 13px;
}
.s7-n-row {
  display: flex;
  align-items: baseline;
  gap: 12px;
}
.s7-n-k {
  display: inline-block;
  width: 60px;
  flex-shrink: 0;
  font-size: 11px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-secondary);
  font-family: "SF Mono", Menlo, monospace;
}
.s7-n-v {
  flex: 1;
  color: var(--ink);
  line-height: 1.45;
}
.s7-n-v kbd {
  font-family: "SF Mono", Menlo, monospace;
  font-size: 11px;
  padding: 1px 5px;
  background: var(--card-bg);
  border: 1px solid var(--rule);
  border-radius: 3px;
}

/* ---- Step controls ----------------------------------------------- */
.s7-controls {
  display: flex;
  align-items: center;
  gap: 22px;
  padding: 12px 16px;
  background: var(--bg);
  border: 1px solid var(--rule);
  border-radius: 4px;
  flex-wrap: wrap;
}
.s7-control-group { display: flex; align-items: center; gap: 10px; }
.s7-control-label {
  font-size: 11px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-secondary);
  font-family: "SF Mono", Menlo, monospace;
}
#s7-step { width: 220px; }
.s7-control-value {
  font-family: "SF Mono", Menlo, monospace;
  font-size: 12px;
  color: var(--ink);
  min-width: 38px;
  text-align: right;
}
.s7-btn {
  font-family: inherit;
  font-size: 12px;
  padding: 6px 12px;
  background: var(--bg);
  color: var(--ink);
  border: 1px solid var(--rule);
  border-radius: 3px;
  cursor: pointer;
  transition: background 0.12s;
}
.s7-btn:hover:not(:disabled) { background: var(--card-bg); }
.s7-btn:disabled { opacity: 0.4; cursor: not-allowed; }
.s7-btn-primary {
  background: var(--accent, #d97a1f);
  color: var(--bg);
  border-color: var(--accent, #d97a1f);
  font-weight: 600;
}
.s7-btn-primary:hover:not(:disabled) {
  background: var(--accent, #d97a1f);
  filter: brightness(1.08);
}

/* ---- Caption ----------------------------------------------------- */
.s7-caption {
  font-style: italic;
  color: var(--ink-secondary);
  text-align: center;
  margin: 0;
  line-height: 1.55;
}

/* ---- Narrow viewport --------------------------------------------- */
@media (max-width: 1100px) {
  .s7-cheat { gap: 12px; }
  .s7-canvas-host canvas { max-width: 100%; height: auto; }
  .s7-side-arrow { margin-top: 8px; padding: 4px 8px; }
  .s7-side-arrow-glyph { transform: rotate(90deg); font-size: 24px; }
}