/* ═══════════════════════════════════════════════════════════
   DIFFUSION LAB — page-specific styles. Editorial chrome inherits
   from main.css; this file adds the demo, schedule explorer,
   receipts grid, and how-it-works cards.
   ═══════════════════════════════════════════════════════════ */

.df-main {
  background: var(--paper);
  color: var(--ink);
}

/* ── Hero ───────────────────────────────────────────────────── */
.df-hero {
  padding: 120px 48px 60px;
  max-width: 1200px;
}
.df-title {
  margin-top: 22px;
}
.df-kicker {
  margin-top: 24px;
  max-width: 720px;
  font-size: 17px;
  line-height: 1.55;
  color: var(--ink-soft);
}
.df-dateline {
  margin-top: 56px;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px;
  max-width: 900px;
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.df-dateline .label {
  color: var(--ink-dim);
}
.df-dateline .value {
  color: var(--ink);
  margin-top: 4px;
  text-transform: none;
  letter-spacing: 0.04em;
  font-size: 12px;
}

/* ── Section wrapper ───────────────────────────────────────── */
.df-section {
  padding: 80px 48px;
  max-width: 1200px;
}
.df-section .section-label {
  margin-bottom: 28px;
}
.df-lede {
  font-family: "Newsreader", Georgia, serif;
  font-style: italic;
  font-size: 22px !important;
  line-height: 1.4 !important;
  color: var(--ink) !important;
  max-width: 720px;
  margin-bottom: 18px;
}
.df-prose {
  max-width: 720px;
  font-size: 17px;
  line-height: 1.6;
  color: var(--ink);
  margin-top: 18px;
}
.df-note {
  max-width: 720px;
  font-size: 15px;
  line-height: 1.55;
  color: var(--ink-soft);
  margin-bottom: 36px;
}

/* ── Demo: canvas + controls side-by-side ──────────────────── */
.df-demo-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(300px, 380px);
  gap: 40px;
  align-items: start;
}

.df-canvas-wrap {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.df-canvas-frame {
  position: relative;
  width: 100%;
  aspect-ratio: 1 / 1;
  border: 2px solid var(--ink);
  background: var(--paper-2);
  overflow: hidden;
}
#df-canvas {
  display: block;
  width: 100%;
  height: 100%;
  cursor: crosshair;
  touch-action: none;
  image-rendering: pixelated;
}
.df-canvas-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-dim);
  pointer-events: none;
  transition: opacity 200ms;
}
.df-canvas-overlay.hidden {
  opacity: 0;
}

.df-canvas-tools {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}
.df-tool-label {
  font-family: "DM Mono", ui-monospace, monospace;
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-dim);
  margin-right: 4px;
}
.df-tool-btn {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--ink);
  padding: 8px 14px;
  font-family: "DM Mono", ui-monospace, monospace;
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background 180ms, color 180ms, opacity 180ms;
}
.df-tool-btn:hover:not(:disabled) {
  background: var(--ink);
  color: var(--paper);
}
.df-tool-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}
.df-tool-btn.active {
  background: var(--ink);
  color: var(--paper);
}
.df-btn-primary {
  border-color: var(--accent);
  color: var(--accent);
}
.df-btn-primary:hover:not(:disabled) {
  background: var(--accent);
  color: var(--paper);
}

/* ── Controls panel ────────────────────────────────────────── */
.df-controls {
  border: 1px solid var(--ink);
  padding: 24px;
  background: var(--paper);
  display: flex;
  flex-direction: column;
  gap: 22px;
}
.df-control-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.df-control-label {
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-dim);
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}
.df-control-val {
  color: var(--ink);
  font-size: 11px;
  letter-spacing: 0.04em;
  text-transform: none;
}
.df-schedule-toggle {
  display: flex;
  gap: 8px;
}
.df-pill {
  background: transparent;
  border: 1px solid var(--ink-dim);
  color: var(--ink-soft);
  padding: 6px 14px;
  border-radius: 999px;
  font-family: "DM Mono", ui-monospace, monospace;
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background 180ms, color 180ms, border-color 180ms;
}
.df-pill:hover {
  border-color: var(--ink);
  color: var(--ink);
}
.df-pill.active {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}

.df-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 4px;
  background: var(--ink-dim);
  border-radius: 0;
  outline: none;
  cursor: pointer;
}
.df-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  background: var(--accent);
  border: 2px solid var(--paper);
  border-radius: 50%;
  cursor: pointer;
}
.df-slider::-moz-range-thumb {
  width: 16px;
  height: 16px;
  background: var(--accent);
  border: 2px solid var(--paper);
  border-radius: 50%;
  cursor: pointer;
}
.df-slider-labels {
  display: flex;
  justify-content: space-between;
  font-size: 10px;
  color: var(--ink-dim);
  letter-spacing: 0.1em;
}

.df-action-row {
  flex-direction: row;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 4px;
}

.df-step-display {
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-soft);
  display: flex;
  justify-content: space-between;
  padding: 10px 0;
  border-top: 1px solid var(--ink-dim);
  border-bottom: 1px solid var(--ink-dim);
}

.df-equation-box {
  border: 1px solid var(--ink-dim);
  padding: 14px;
  background: var(--paper-2);
}
.df-eq-label {
  font-size: 9px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-dim);
  margin-bottom: 6px;
}
.df-eq {
  font-family: "Newsreader", Georgia, serif;
  font-size: 15px;
  line-height: 1.4;
  color: var(--ink);
}

/* ── How it works grid ────────────────────────────────────── */
.df-how-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 32px;
  margin-top: 12px;
}
.df-how-card {
  border-top: 1px solid var(--ink);
  padding-top: 18px;
}
.df-how-fig {
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 10px;
}
.df-how-title {
  font-size: 26px;
  line-height: 1.15;
  letter-spacing: -0.015em;
  font-weight: 400;
  margin: 0 0 12px;
}
.df-how-card p {
  font-size: 15px;
  line-height: 1.55;
  color: var(--ink-soft);
}

/* ── Schedule explorer ────────────────────────────────────── */
.df-schedule-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 32px;
  margin-top: 16px;
}
.df-schedule-col {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.df-schedule-head {
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-dim);
}
.df-schedule-col canvas {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--ink);
  background: var(--paper-2);
  image-rendering: pixelated;
}
.df-schedule-meta {
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

/* ── Receipts grid ────────────────────────────────────────── */
.df-receipts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0;
  border: 1px solid var(--ink);
  margin-top: 16px;
}
.df-receipt {
  padding: 22px 20px;
  border-right: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
}
.df-receipt:nth-child(3n) { border-right: none; }
.df-receipt:nth-last-child(-n+3) { border-bottom: none; }
.df-receipt-label {
  font-family: "DM Mono", ui-monospace, monospace;
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-dim);
  margin-bottom: 8px;
}
.df-receipt-value {
  font-family: "Newsreader", Georgia, serif;
  font-size: 32px;
  line-height: 1;
  color: var(--ink);
}
.df-receipt-value .small {
  font-size: 18px;
  color: var(--ink-soft);
  margin-left: 4px;
}

.df-colophon-section {
  padding-bottom: 80px;
}

/* ── Mobile ───────────────────────────────────────────────── */
@media (max-width: 900px) {
  .df-hero, .df-section { padding-left: 24px; padding-right: 24px; }
  .df-demo-layout { grid-template-columns: 1fr; }
  .df-dateline { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
  .df-how-grid { grid-template-columns: 1fr; gap: 24px; }
  .df-schedule-grid { grid-template-columns: 1fr; }
  .df-receipts { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .df-receipt:nth-child(3n) { border-right: 1px solid var(--ink); }
  .df-receipt:nth-child(2n) { border-right: none; }
  .df-receipt:nth-last-child(-n+3) { border-bottom: 1px solid var(--ink); }
  .df-receipt:nth-last-child(-n+2) { border-bottom: none; }
}
@media (max-width: 540px) {
  .df-receipts { grid-template-columns: 1fr; }
  .df-receipt { border-right: none; }
  .df-receipt:nth-last-child(-n+2) { border-bottom: 1px solid var(--ink); }
  .df-receipt:last-child { border-bottom: none; }
  .df-dateline { grid-template-columns: 1fr; }
}