:root {
  --bg: #f5f7fb;
  --panel: #ffffff;
  --ink: #172033;
  --muted: #5a6578;
  --border: #dbe2ee;
  --brand: #003057;
  --brand-2: #0072ce;
  --accent: #00a3ad;
  --success: #178a53;
  --warn: #b56a00;
  --danger: #b42318;
  --soft-blue: #eaf4ff;
  --soft-teal: #e9fbfb;
  --soft-amber: #fff6df;
  --soft-green: #e9f8ef;
  --soft-red: #fff1f0;
  --shadow: 0 16px 38px rgba(20, 37, 63, 0.1);
  --radius: 18px;
  --ease: cubic-bezier(0.22, 0.9, 0.3, 1);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background: radial-gradient(circle at top left, #e8f5ff 0, transparent 30%), var(--bg);
  color: var(--ink);
}

.lesson-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  flex-wrap: wrap;
  width: min(1180px, calc(100% - 28px));
  margin: 18px auto 14px;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--panel);
  box-shadow: var(--shadow);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
.lesson-nav a {
  padding: 7px 10px;
  border-radius: 8px;
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 800;
  text-decoration: none;
}
.lesson-nav a:hover,
.lesson-nav a:focus-visible { color: var(--brand-2); background: var(--soft-blue); }
.lesson-nav a[aria-current="page"] { color: #fff; background: var(--brand-2); }

button, select { font: inherit; }

/* ---------- header and chrome ---------- */

.site-header {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 12px clamp(16px, 4vw, 48px);
  background: linear-gradient(135deg, var(--brand), #174d68 70%, #1d6b72);
  color: #fff;
}

.unit-label {
  margin: 0 0 8px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.78rem;
  opacity: 0.85;
}

h1 { margin: 0; font-size: clamp(1.25rem, 2.2vw, 1.65rem); line-height: 1.15; text-align: center; }

.subtitle { max-width: 850px; margin: 10px 0 0; color: rgba(255,255,255,0.86); }

.header-card { display: flex; flex-wrap: wrap; gap: 8px; min-width: 230px; justify-content: flex-end; }

.badge {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  padding: 7px 10px;
  color: #fff;
  background: rgba(255,255,255,0.16);
  border: 1px solid rgba(255,255,255,0.3);
  font-size: 0.85rem;
  white-space: nowrap;
}
.badge.soft { background: rgba(255,255,255,0.09); }

.app-shell { width: min(1220px, calc(100% - 28px)); margin: 10px auto 22px; }

.scene-nav, .control-bar, .progress-row, .scene-root, .site-footer {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.scene-nav { display: flex; gap: 8px; flex-wrap: wrap; padding: 8px; }

.scene-tab, .control-bar button, .speed-control select {
  border: 1px solid var(--border);
  background: #fff;
  color: var(--ink);
  border-radius: 12px;
  padding: 8px 11px;
  cursor: pointer;
  transition: background 200ms var(--ease), color 200ms var(--ease), transform 150ms var(--ease);
}
.scene-tab:hover, .control-bar button:hover { transform: translateY(-1px); }
.scene-tab.active { background: var(--brand); color: #fff; border-color: var(--brand); }

.control-bar { display: flex; flex-wrap: wrap; gap: 8px; padding: 9px; margin-top: 8px; align-items: center; }
.control-bar button.primary { background: var(--brand-2); color: #fff; border-color: var(--brand-2); font-weight: 700; }
.control-bar button.primary.playing { background: var(--warn); border-color: var(--warn); }

.speed-control { margin-left: auto; display: inline-flex; align-items: center; gap: 8px; color: var(--muted); }

.progress-row {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 14px;
  align-items: center;
  padding: 9px 12px;
  margin-top: 8px;
}

.progress-track { height: 10px; background: #edf2f7; border-radius: 999px; overflow: hidden; }
.progress-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--brand-2), var(--accent));
  transition: width 420ms var(--ease);
}

#stepCounter { margin: 0; color: var(--muted); font-size: 0.9rem; white-space: nowrap; }

.key-hints { margin: 0; color: var(--muted); font-size: 0.78rem; }
.key-hints kbd {
  border: 1px solid var(--border);
  border-bottom-width: 2px;
  border-radius: 5px;
  padding: 1px 5px;
  background: #f6f9fc;
  font-family: inherit;
  font-size: 0.75rem;
}

.scene-root { margin-top: 8px; padding: clamp(14px, 2vw, 22px); min-height: 640px; }

.scene-header { display: flex; gap: 18px; align-items: flex-start; justify-content: space-between; margin-bottom: 14px; flex-wrap: wrap; }
.scene-side { display: grid; gap: 10px; flex: 1 1 300px; max-width: 420px; }
.scene-play {
  justify-self: stretch;
  border: 1px solid var(--brand-2);
  background: var(--brand-2);
  color: #fff;
  border-radius: 12px;
  padding: 10px 14px;
  font-weight: 700;
  cursor: pointer;
  transition: background 200ms var(--ease), transform 150ms var(--ease), border-color 200ms var(--ease);
}
.scene-play:hover { transform: translateY(-1px); }
.scene-play.playing { background: var(--warn); border-color: var(--warn); }
.scene-kicker { margin: 0 0 6px; color: var(--brand-2); font-weight: 700; }
.scene-title { margin: 0; font-size: clamp(1.3rem, 2.2vw, 1.85rem); }
.scene-purpose { margin: 8px 0 0; color: var(--muted); max-width: 760px; }

.caption-card {
  background: #f6f9fc;
  border: 1px solid var(--border);
  border-left: 5px solid var(--brand-2);
  padding: 12px 14px;
  border-radius: 14px;
  min-width: 260px;
  max-width: 400px;
}
.caption-card strong { color: var(--brand); }
.caption-card p { margin: 6px 0 0; color: var(--ink); }

.site-footer { margin: 0 auto 24px; width: min(1220px, calc(100% - 28px)); padding: 12px 18px; color: var(--muted); }
.resource-credit {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--border);
  line-height: 1.6;
}
.resource-credit p { margin: 4px 0; }
.resource-credit a { color: var(--brand); }
.resource-credit details { margin-top: 8px; }
.resource-credit summary { color: var(--ink); cursor: pointer; font-weight: 700; }

/* ---------- shared building blocks ---------- */

.panel { background: #fff; border: 1px solid var(--border); border-radius: 16px; padding: 14px; }

.grid-3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
@media (max-width: 980px) { .grid-3, .grid-2 { grid-template-columns: 1fr; } }

.network-panel { transition: opacity 450ms var(--ease), box-shadow 450ms var(--ease), transform 450ms var(--ease); }
.network-panel.dim { opacity: 0.42; }
.network-panel.focus { box-shadow: 0 0 0 3px var(--brand-2), var(--shadow); transform: translateY(-3px); }
.network-panel h3 { margin: 0 0 8px; }

.network-stage {
  position: relative;
  height: 250px;
  border-radius: 14px;
  border: 1px dashed var(--border);
  overflow: hidden;
}
.public-stage { background: linear-gradient(180deg, var(--soft-blue), #fdfeff); }
.permissioned-stage { background: linear-gradient(180deg, var(--soft-amber), #fffdf6); }
.hybrid-stage { background: linear-gradient(180deg, var(--soft-teal), #fbffff); }

.stage-svg { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; }

.link {
  stroke: var(--brand-2);
  stroke-width: 2;
  stroke-dasharray: 7 6;
  opacity: 0;
  transition: opacity 500ms var(--ease);
}
.link.live { opacity: 0.65; animation: dashflow 1.1s linear infinite; }
@keyframes dashflow { to { stroke-dashoffset: -13; } }

.permissioned-stage .link { stroke: var(--warn); }
.hybrid-stage .link { stroke: var(--accent); }

.n {
  position: absolute;
  transform: translate(-50%, -50%) scale(0.35);
  opacity: 0;
  display: grid;
  justify-items: center;
  gap: 2px;
  transition: transform 480ms var(--ease), opacity 480ms var(--ease);
  z-index: 2;
}
.n.live { transform: translate(-50%, -50%) scale(1); opacity: 1; }
.n span {
  font-size: 1.35rem;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 50%;
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  box-shadow: 0 6px 14px rgba(20, 37, 63, 0.14);
}
.n small { font-size: 0.72rem; color: var(--muted); background: rgba(255,255,255,0.85); padding: 1px 5px; border-radius: 6px; }
.n.approved span { border-color: var(--warn); }
.n.denied span { border-color: var(--danger); background: var(--soft-red); }
.n.denied.live { animation: shake 700ms var(--ease) 500ms 1; }
.n.denied small { color: var(--danger); }
@keyframes shake {
  20%, 60% { transform: translate(-52%, -50%) scale(1); }
  40%, 80% { transform: translate(-48%, -50%) scale(1); }
}

.tx-card {
  position: absolute;
  transform: translate(-50%, -50%) scale(0.7);
  opacity: 0;
  background: var(--brand-2);
  color: #fff;
  padding: 8px 10px;
  border-radius: 10px;
  font-size: 0.8rem;
  font-weight: 700;
  z-index: 3;
  box-shadow: 0 10px 22px rgba(0, 63, 116, 0.3);
  transition: transform 500ms var(--ease), opacity 500ms var(--ease);
}
.tx-card.amber { background: #8a5b00; }
.tx-card.teal { background: #097481; }
.tx-card .hash { font-weight: 400; font-size: 0.7rem; opacity: 0.85; }
.tx-card.floating { opacity: 1; transform: translate(-50%, -50%) scale(1); animation: bob 2.6s ease-in-out infinite; }
@keyframes bob { 50% { margin-top: -6px; } }

.gate {
  position: absolute; inset: 8px;
  border: 2px solid rgba(181, 106, 0, 0.55);
  border-radius: 12px;
  pointer-events: none;
}
.lock-icon { position: absolute; top: 2px; left: 50%; transform: translateX(-50%); font-size: 1rem; z-index: 4; }

.private-record {
  position: absolute; left: 6%; top: 8%;
  width: 46%;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px;
  font-size: 0.75rem;
  z-index: 2;
}
.private-record span { color: var(--muted); }
.private-record b { display: block; margin: 2px 0 6px; }
.private-redacted { height: 7px; border-radius: 4px; background: #d5dbe6; margin-top: 4px; width: 92%; }

.public-proof {
  position: absolute; right: 4%; top: 8%;
  background: #063d42;
  color: #b8f3f7;
  font-family: Consolas, monospace;
  font-size: 0.72rem;
  padding: 7px 9px;
  border-radius: 8px;
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 500ms var(--ease) 350ms, transform 500ms var(--ease) 350ms;
  z-index: 3;
}
.public-proof.visible { opacity: 1; transform: translateY(0); }

.key-points { margin: 12px 0 0; padding-left: 18px; color: var(--muted); font-size: 0.9rem; }
.key-points li { margin-bottom: 4px; }

.result-callout {
  margin-top: 14px;
  background: var(--soft-green);
  border: 1px solid #bfe6cf;
  border-radius: 14px;
  padding: 12px 16px;
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 550ms var(--ease), transform 550ms var(--ease);
}
.result-callout.visible { opacity: 1; transform: translateY(0); }
.result-callout h3 { margin: 0 0 4px; color: var(--success); }
.result-callout p { margin: 0; }

/* ---------- scene 2: database vs blockchain ---------- */

.operation-switcher, .mode-switcher { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 12px; }
.operation-switcher button, .mode-switcher button {
  border: 1px solid var(--border);
  background: #fff;
  border-radius: 999px;
  padding: 7px 14px;
  cursor: pointer;
  transition: background 200ms var(--ease), color 200ms var(--ease);
}
.operation-switcher button.active, .mode-switcher button.active {
  background: var(--brand-2);
  color: #fff;
  border-color: var(--brand-2);
}

.db-stage h3, .ledger-stage h3 { margin: 0 0 10px; }

.db-server {
  display: flex; align-items: center; gap: 8px;
  background: var(--soft-blue);
  border: 1px solid #c7e2ff;
  border-radius: 10px;
  padding: 8px 10px;
  margin-bottom: 10px;
}
.db-server span { color: var(--muted); font-size: 0.85rem; }

.data-table { width: 100%; border-collapse: collapse; font-size: 0.88rem; }
.data-table th, .data-table td { border: 1px solid var(--border); padding: 7px 9px; text-align: left; }
.data-table th { background: #f2f6fb; }
.data-table tr { transition: background 500ms var(--ease), opacity 500ms var(--ease); }
.data-table tr.changed { background: var(--soft-green); animation: rowflash 900ms var(--ease) 1; }
.data-table tr.deleted { background: var(--soft-red); opacity: 0.5; text-decoration: line-through; }
@keyframes rowflash { 0% { background: #b6ecc9; } }

.sql-box {
  margin-top: 10px;
  background: #0e1a2b;
  color: #9fd7ff;
  font-family: Consolas, monospace;
  font-size: 0.82rem;
  border-radius: 10px;
  padding: 10px 12px;
  min-height: 40px;
  transition: box-shadow 400ms var(--ease);
}
.sql-box.typed { box-shadow: 0 0 0 2px var(--brand-2) inset; animation: caret 900ms steps(1) 2; }
@keyframes caret { 50% { box-shadow: 0 0 0 2px transparent inset; } }

.explainer-box {
  margin-top: 10px;
  background: #f6f9fc;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 9px 11px;
  font-size: 0.88rem;
  color: var(--muted);
}
.explainer-box strong { color: var(--ink); }

.ledger-copy-row { display: flex; gap: 8px; margin-bottom: 10px; flex-wrap: wrap; }
.ledger-copy {
  flex: 1;
  min-width: 100px;
  text-align: center;
  border: 1px dashed var(--border);
  border-radius: 10px;
  padding: 7px;
  font-size: 0.8rem;
  color: var(--muted);
  opacity: 0.55;
  transform: translateY(4px);
  transition: all 450ms var(--ease);
}
.ledger-copy.active { opacity: 1; transform: translateY(0); border-style: solid; border-color: var(--accent); color: var(--ink); background: var(--soft-teal); }
.ledger-copy.reject { opacity: 1; transform: translateY(0); border-style: solid; border-color: var(--danger); color: var(--danger); background: var(--soft-red); }

.block-chain { display: grid; gap: 0; }
.block {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 10px;
  align-items: center;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 9px 11px;
  background: #fbfcfe;
  opacity: 0.45;
  transform: translateX(-6px);
  transition: opacity 500ms var(--ease), transform 500ms var(--ease), border-color 500ms var(--ease), background 500ms var(--ease);
}
.block.live { opacity: 1; transform: translateX(0); border-color: var(--brand-2); background: #fff; }
.block.broken { opacity: 1; transform: translateX(0); border-color: var(--danger); background: var(--soft-red); animation: shake 600ms var(--ease) 1; }
.block-num {
  width: 26px; height: 26px;
  border-radius: 8px;
  background: var(--brand);
  color: #fff;
  display: grid;
  place-items: center;
  font-weight: 700;
  font-size: 0.85rem;
}
.block.broken .block-num { background: var(--danger); }
.block-hash { font-family: Consolas, monospace; font-size: 0.72rem; color: var(--muted); margin-top: 2px; }
.block-hash .bad { color: var(--danger); }

.chain-joint {
  width: 3px;
  height: 14px;
  margin-left: 22px;
  background: var(--border);
  transition: background 400ms var(--ease), transform 400ms var(--ease);
}
.chain-joint.live { background: var(--brand-2); }
.chain-joint.snapped { background: var(--danger); transform: skewX(-24deg); }

.tamper-row { display: flex; align-items: center; gap: 10px; margin-top: 10px; flex-wrap: wrap; }
.tamper-btn {
  border: 1px solid var(--danger);
  color: var(--danger);
  background: #fff;
  border-radius: 999px;
  padding: 7px 14px;
  cursor: pointer;
  font-weight: 700;
  transition: background 200ms var(--ease), color 200ms var(--ease);
}
.tamper-btn:hover { background: var(--soft-red); }
.tamper-btn.undo { border-color: var(--success); color: var(--success); }
.tamper-btn.undo:hover { background: var(--soft-green); }
.tamper-note {
  font-size: 0.82rem;
  color: var(--danger);
  max-width: 420px;
  opacity: 0;
  transition: opacity 450ms var(--ease);
}
.tamper-note.visible { opacity: 1; }
.draw-row .tamper-note { color: var(--muted); }
.draw-row .tamper-btn { border-color: var(--brand-2); color: var(--brand-2); }
.draw-row .tamper-btn:hover { background: var(--soft-blue); }
.draw-row { display: flex; align-items: center; gap: 10px; margin-top: 12px; flex-wrap: wrap; }

/* ---------- scene 3: consensus ---------- */

.consensus-stage { display: grid; grid-template-columns: 300px 1fr; gap: 14px; }
@media (max-width: 900px) { .consensus-stage { grid-template-columns: 1fr; } }

.transaction-pool h3 { margin: 0 0 6px; }
.transaction-pool p { margin: 0 0 10px; color: var(--muted); font-size: 0.9rem; }

.tx-list { display: grid; gap: 6px; margin-bottom: 10px; }
.tx-pill {
  display: flex; justify-content: space-between; gap: 8px;
  background: var(--soft-blue);
  border: 1px solid #cbe4ff;
  border-radius: 999px;
  padding: 6px 11px;
  font-size: 0.8rem;
}
.tx-pill span:first-child { font-weight: 700; color: var(--brand-2); }

.candidate-block {
  border: 2px dashed var(--brand-2);
  border-radius: 12px;
  padding: 9px 11px;
  background: #f4f9ff;
}
.candidate-block strong { color: var(--brand); }
.hash-target { margin: 4px 0 0; font-family: Consolas, monospace; font-size: 0.76rem; color: var(--muted); }

.energy-row { display: flex; align-items: center; gap: 10px; margin-top: 12px; color: var(--muted); font-size: 0.82rem; }

.meter { flex: 1; height: 9px; border-radius: 999px; background: #edf2f7; overflow: hidden; }
.meter span { display: block; height: 100%; width: 8%; background: linear-gradient(90deg, var(--brand-2), var(--accent)); transition: width 600ms var(--ease); }

.mode-visual h3 { margin: 0 0 6px; }
.mode-visual > p { margin: 0 0 12px; color: var(--muted); }

.validator-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
.validator-grid.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
@media (max-width: 640px) { .validator-grid { grid-template-columns: 1fr; } }

.validator {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px 12px;
  background: #fbfcfe;
  transition: border-color 350ms var(--ease), background 350ms var(--ease), box-shadow 350ms var(--ease), transform 350ms var(--ease);
}
.validator-name { font-weight: 700; }
.validator-meta { color: var(--muted); font-size: 0.8rem; margin-top: 3px; }
.validator .meter { margin-top: 7px; }
.validator .win-note { display: none; color: var(--success); font-weight: 700; }
.validator.winner {
  border-color: var(--success);
  background: var(--soft-green);
  box-shadow: 0 0 0 3px rgba(23, 138, 83, 0.22);
  animation: winpulse 900ms var(--ease) 1;
}
.validator.winner .win-note { display: block; }
.validator.winner .meter span { background: var(--success); }
@keyframes winpulse { 0% { transform: scale(0.97); } 55% { transform: scale(1.02); } 100% { transform: scale(1); } }

.validator.scanning { border-color: var(--brand-2); background: var(--soft-blue); box-shadow: 0 0 0 3px rgba(0, 114, 206, 0.25); }
.validator.asleep { opacity: 0.8; }
.validator.asleep .validator-name::after { content: ' 💤'; }

.hash-readout { font-family: Consolas, monospace; font-size: 0.74rem; color: var(--muted); margin-top: 4px; }
.hash-readout code { color: var(--brand-2); }
.validator.winner .hash-readout code { color: var(--success); font-weight: 700; }

.timer-circle {
  width: 52px; height: 52px;
  margin-top: 7px;
  border-radius: 50%;
  border: 3px solid var(--brand-2);
  display: grid;
  place-items: center;
  font-weight: 700;
  color: var(--brand);
  background: #fff;
}
.validator.winner .timer-circle { border-color: var(--success); color: var(--success); }

.dpos-voters {
  display: grid;
  grid-template-columns: auto auto auto;
  gap: 7px 9px;
  align-items: center;
  justify-content: start;
  margin-bottom: 12px;
}
.voter {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 5px 11px;
  font-size: 0.82rem;
  opacity: 0.35;
  transform: translateY(3px);
  transition: all 400ms var(--ease);
}
.vote-arrow { color: var(--brand-2); font-weight: 700; opacity: 0.2; transition: opacity 400ms var(--ease); }
.voter.live { opacity: 1; transform: translateY(0); border-color: var(--brand-2); background: var(--soft-blue); }
.vote-arrow.live { opacity: 1; }

/* ---------- scene 4: interledger ---------- */

.packet-stage { position: relative; height: 430px; overflow: hidden; }
.packet-stage .link.fwd { stroke: var(--brand-2); }
.packet-stage .link.ret { stroke: var(--accent); }
.packet-stage .link.turn { stroke: var(--muted); }

.ledger-box {
  position: absolute;
  transform: translate(-50%, -50%);
  width: min(240px, 26%);
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 11px 13px;
  box-shadow: 0 8px 20px rgba(20, 37, 63, 0.08);
  transition: box-shadow 400ms var(--ease), border-color 400ms var(--ease), background 400ms var(--ease);
}
.ledger-box h3 { margin: 0 0 5px; font-size: 1rem; }
.ledger-box p { margin: 0 0 4px; font-size: 0.8rem; color: var(--muted); }
.ledger-box .reserve, .ledger-box .fee { font-family: Consolas, monospace; font-size: 0.72rem; }
.ledger-box.focus { border-color: var(--brand-2); box-shadow: 0 0 0 3px rgba(0, 114, 206, 0.25); }
.ledger-box.fail { border-color: var(--danger); background: var(--soft-red); }
.connector { border-style: dashed; }

.packet {
  position: absolute;
  left: 16%;
  top: 30%;
  transform: translate(-50%, -140%);
  background: var(--brand-2);
  color: #fff;
  font-weight: 700;
  font-size: 0.8rem;
  border-radius: 999px;
  padding: 6px 13px;
  box-shadow: 0 10px 20px rgba(0, 63, 116, 0.35);
  opacity: 0;
  z-index: 5;
  transition: left 900ms var(--ease), top 900ms var(--ease), opacity 400ms var(--ease), background 400ms var(--ease);
}
.packet.visible { opacity: 1; }
.packet.success { background: var(--success); }
.packet.reject { background: var(--danger); }

.interledger-legend {
  position: absolute;
  left: 12px; right: 12px; bottom: 10px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}
.legend-item {
  background: #f6f9fc;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 7px 10px;
  font-size: 0.76rem;
  color: var(--muted);
}
.legend-item b { display: block; color: var(--ink); }
@media (max-width: 720px) {
  .interledger-legend { grid-template-columns: 1fr; position: static; margin-top: 320px; }
}

/* ---------- scene 5: fabric ---------- */

.fabric-stage { display: grid; grid-template-columns: 290px 1fr; gap: 14px; }
@media (max-width: 900px) { .fabric-stage { grid-template-columns: 1fr; } }

.ledger-definition h3, .fabric-definition h3 { margin: 0 0 6px; }
.ledger-definition p, .fabric-definition > p { margin: 0 0 10px; color: var(--muted); font-size: 0.9rem; }

.mini-ledger { display: grid; gap: 6px; margin-bottom: 10px; }
.ledger-row {
  display: grid;
  grid-template-columns: 26px 1fr;
  gap: 8px;
  align-items: center;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 7px 9px;
  font-size: 0.85rem;
  transition: border-color 450ms var(--ease), background 450ms var(--ease), opacity 450ms var(--ease);
}
.ledger-row span {
  width: 24px; height: 24px;
  border-radius: 7px;
  background: var(--brand);
  color: #fff;
  display: grid;
  place-items: center;
  font-size: 0.78rem;
  font-weight: 700;
}
.ledger-row.pending { opacity: 0.4; border-style: dashed; }
.ledger-row.committed { opacity: 1; border-style: solid; border-color: var(--success); background: var(--soft-green); }
.ledger-row.committed span { background: var(--success); }
.ledger-row.rejected { opacity: 1; border-style: solid; border-color: var(--danger); background: var(--soft-red); }
.ledger-row.rejected span { background: var(--danger); }

.fabric-flow {
  position: relative;
  height: 380px;
  border: 1px dashed var(--border);
  border-radius: 14px;
  background: linear-gradient(180deg, #f8fbff, #ffffff);
  overflow: hidden;
}
.fabric-flow .link { stroke: var(--brand-2); }
.channel-tag {
  position: absolute;
  top: 8px; left: 10px;
  background: var(--brand);
  color: #fff;
  font-size: 0.72rem;
  padding: 4px 9px;
  border-radius: 999px;
  z-index: 4;
}

.fabric-node {
  position: absolute;
  transform: translate(-50%, -50%) scale(0.6);
  opacity: 0.28;
  display: grid;
  justify-items: center;
  gap: 2px;
  text-align: center;
  width: 128px;
  transition: transform 500ms var(--ease), opacity 500ms var(--ease);
  z-index: 3;
}
.fabric-node .icon {
  font-size: 1.3rem;
  background: #fff;
  border: 2px solid var(--border);
  width: 46px; height: 46px;
  border-radius: 13px;
  display: grid;
  place-items: center;
  box-shadow: 0 6px 14px rgba(20, 37, 63, 0.12);
  transition: border-color 400ms var(--ease), background 400ms var(--ease);
}
.fabric-node strong { font-size: 0.8rem; }
.fabric-node small { font-size: 0.7rem; color: var(--muted); }
.fabric-node.live { opacity: 1; transform: translate(-50%, -50%) scale(1); }
.fabric-node.approved .icon { border-color: var(--success); background: var(--soft-green); }
.fabric-node.failed .icon { border-color: var(--danger); background: var(--soft-red); }
.fabric-node.failed { opacity: 1; transform: translate(-50%, -50%) scale(1); }

.policy-box {
  position: absolute;
  left: 10px; right: 10px; bottom: 8px;
  background: #f6f9fc;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px 11px;
  font-size: 0.8rem;
  color: var(--muted);
  transition: border-color 450ms var(--ease), background 450ms var(--ease);
  z-index: 4;
}
.policy-box.ok { border-color: var(--success); background: var(--soft-green); color: var(--ink); }
.policy-box.bad { border-color: var(--danger); background: var(--soft-red); color: var(--ink); }

/* ---------- accessibility ---------- */

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001s !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001s !important;
  }
}