:root {
  --bg: #0b0b12;
  --bg-2: #12121c;
  --panel: #0f1016;
  --line: #3a4a1f;
  --neon: #d0ed57;
  --neon-dim: #8da23a;
  --neon-faint: rgba(208, 237, 87, 0.08);
  --cyan: #5ef6ff;
  --red: #ff5a5f;
  --text: #e4e9d0;
  --muted: #8b927a;
  --row-hl: #262b3c;
  --font: "Rajdhani", "Bahnschrift", "DIN Alternate", "Roboto Condensed", "Arial Narrow", system-ui, sans-serif;
}

* { box-sizing: border-box; }

html, body { margin: 0; }

body {
  background:
    linear-gradient(rgba(208, 237, 87, 0.025) 1px, transparent 1px) 0 0 / 100% 4px,
    radial-gradient(ellipse at 20% 0%, #161a10 0%, var(--bg) 60%);
  background-color: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

button { font: inherit; }

.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  padding: 20px 24px 16px;
  border-bottom: 1px solid var(--line);
}

.brand { display: flex; align-items: center; gap: 14px; }
.brand-mark {
  display: grid; place-items: center;
  width: 44px; height: 44px;
  background: var(--neon); color: var(--bg);
  font-size: 20px; letter-spacing: -2px;
  clip-path: polygon(0 0, 100% 0, 100% 75%, 75% 100%, 0 100%);
}
h1 {
  margin: 0;
  font-size: 26px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--neon);
}
h1 span { color: var(--text); font-weight: 400; }
.sub { margin: 2px 0 0; color: var(--muted); font-size: 14px; letter-spacing: 0.03em; }
.top-actions { display: flex; gap: 8px; flex-wrap: wrap; }

main { flex: 1; width: 100%; max-width: 1240px; margin: 0 auto; padding: 20px 24px 32px; }

.btn {
  background: var(--neon);
  color: #0b0b12;
  border: 1px solid var(--neon);
  padding: 8px 16px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  cursor: pointer;
  clip-path: polygon(0 0, 100% 0, 100% 70%, calc(100% - 8px) 100%, 0 100%);
}
.btn:hover { filter: brightness(1.1); }
.btn:focus-visible { outline: 2px solid var(--cyan); outline-offset: 2px; }
.btn.ghost { background: transparent; color: var(--neon); }
.btn.ghost:hover { background: var(--neon-faint); }
.btn.tiny { padding: 2px 10px; font-size: 13px; margin-left: auto; }

kbd {
  border: 1px solid var(--neon-dim);
  padding: 0 6px;
  font-family: inherit;
  font-size: 0.85em;
}

/* ---------- drop zone ---------- */
.drop {
  position: relative;
  border: 1px dashed var(--neon-dim);
  background: var(--neon-faint);
  padding: 28px 20px;
  text-align: center;
  outline: none;
  transition: background 0.15s, border-color 0.15s;
}
.drop.compact { padding: 12px 16px; }
.drop.compact .drop-inner { display: flex; align-items: center; justify-content: center; gap: 16px; flex-wrap: wrap; }
.drop.compact .drop-title { font-size: 17px; }
.drop.compact .drop-hint { display: none; }
.drop.compact .drop-buttons { margin: 0; }
.drop:focus-visible, .drop.over { border-color: var(--neon); background: rgba(208, 237, 87, 0.14); }
.drop-title { font-size: 24px; font-weight: 600; color: var(--neon); letter-spacing: 0.04em; }
.drop-hint { color: var(--muted); margin-top: 4px; }
.drop-buttons { display: flex; gap: 10px; justify-content: center; margin-top: 16px; flex-wrap: wrap; }
.status { margin-top: 10px; min-height: 1.3em; color: var(--muted); font-size: 15px; }
.status.err { color: var(--red); }
.status.ok { color: var(--neon); }

/* ---------- workspace ---------- */
.workspace {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  gap: 20px;
  margin-top: 20px;
  align-items: start;
}
.workspace[hidden] { display: none; }
.side { display: flex; flex-direction: column; gap: 20px; min-width: 0; }

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  min-width: 0;
}
.panel-head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--line);
}
.matrix-panel .panel-head { background: var(--neon); color: var(--bg); border-color: var(--neon); }
.matrix-panel .panel-head h2 { color: var(--bg); }
.panel-head h2 {
  margin: 0;
  font-size: 18px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--neon);
}
.ph-icon { font-size: 18px; }
.ph-meta { margin-left: auto; font-size: 13px; letter-spacing: 0.06em; opacity: 0.8; }

.hint { margin: 0; padding: 8px 14px 12px; color: var(--muted); font-size: 13px; }

/* ---------- matrix ---------- */
.matrix-wrap { position: relative; padding: 18px; container-type: inline-size; --gap: 20px; }
.matrix {
  display: grid;
  gap: var(--gap); /* room for the arrows between neighbouring cells */
  justify-content: center;
}
.cell {
  position: relative;
  aspect-ratio: 1;
  /* fit --cols cells in the panel, whatever its width */
  width: min(60px, calc((100cqw - (var(--cols, 6) - 1) * var(--gap)) / var(--cols, 6)));
  display: grid;
  place-items: center;
  background: var(--panel);
  border: 1px solid transparent;
  color: var(--neon);
  font-size: min(28px, calc(0.42 * min(60px, (100cqw - (var(--cols, 6) - 1) * var(--gap)) / var(--cols, 6))));
  font-weight: 500;
  letter-spacing: 0.04em;
  cursor: pointer;
  z-index: 1;
}
.cell:hover { border-color: var(--neon-dim); }
.cell:focus-visible { outline: 2px solid var(--cyan); outline-offset: -2px; }
.cell.unknown { color: var(--red); border-color: var(--red); }
.matrix.solved .cell { color: rgba(208, 237, 87, 0.35); }
.matrix.solved .cell.step { color: var(--bg); background: var(--neon); }
.matrix .cell.first-row:not(.step) { background: var(--row-hl); }
.matrix.solved .cell.step.first { background: var(--cyan); }
.cell .n {
  position: absolute;
  top: 2px; right: 4px;
  font-size: 12px;
  font-weight: 700;
  line-height: 1;
}
.path-svg { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; z-index: 2; overflow: visible; }
.path-svg line { stroke-linecap: round; }
.path-svg .halo { stroke: var(--panel); stroke-width: 7; }
.path-svg .seg { stroke: var(--neon); stroke-width: 3; }
.path-svg .seg.first { stroke: var(--cyan); }
.path-svg .head { fill: var(--neon); }
.path-svg .head.first { fill: var(--cyan); }
.matrix-wrap { padding-top: 26px; }

/* ---------- buffer ---------- */
.buffer-size { display: flex; gap: 6px; padding: 12px 14px 0; flex-wrap: wrap; align-items: center; }
.buffer-size .lbl { color: var(--muted); font-size: 13px; margin-right: 4px; letter-spacing: 0.06em; text-transform: uppercase; }
.chip {
  min-width: 34px;
  padding: 3px 8px;
  border: 1px solid var(--neon-dim);
  background: transparent;
  color: var(--neon);
  cursor: pointer;
  font-size: 15px;
}
.chip[aria-checked="true"] { background: var(--neon); color: var(--bg); border-color: var(--neon); }
.chip.detected::after { content: "•"; margin-left: 2px; color: var(--cyan); }
.buffer { display: flex; gap: 6px; padding: 12px 14px 14px; flex-wrap: wrap; }
.slot {
  width: 42px; height: 42px;
  display: grid; place-items: center;
  border: 1px dashed var(--neon-dim);
  color: var(--neon);
  font-size: 18px;
  font-weight: 600;
}
.slot.filled { border-style: solid; border-color: var(--neon); background: var(--neon-faint); }

/* ---------- daemons ---------- */
.daemons { list-style: none; margin: 0; padding: 6px 0; counter-reset: d; }
.daemon {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-left: 3px solid transparent;
}
.daemon.ok { border-left-color: var(--neon); background: var(--neon-faint); }
.daemon.fail { border-left-color: var(--red); }
.daemon.off { opacity: 0.45; }
.daemon input[type="checkbox"] { accent-color: var(--neon); width: 18px; height: 18px; margin: 0; }
.daemon .codes { display: flex; gap: 4px; flex-wrap: wrap; flex: 1; }
.code {
  min-width: 40px;
  padding: 2px 6px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--text);
  font-size: 20px;
  font-weight: 500;
  cursor: pointer;
}
.code:hover { border-color: var(--neon-dim); }
.code.add { color: var(--muted); font-size: 16px; min-width: 30px; }
.daemon .state {
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  min-width: 64px;
  text-align: right;
}
.daemon.ok .state { color: var(--neon); }
.daemon.fail .state { color: var(--red); }
.daemon .value {
  background: none;
  border: 1px solid transparent;
  color: var(--cyan);
  cursor: pointer;
  font-size: 13px;
  letter-spacing: -1px;
  min-width: 64px;
  text-align: left;
  padding: 2px 4px;
}
.daemon .value:hover { border-color: var(--cyan); }
.result .note { margin-top: 6px; color: var(--muted); font-size: 14px; }
.daemon .del { background: none; border: none; color: var(--muted); cursor: pointer; font-size: 18px; padding: 0 4px; }
.daemon .del:hover { color: var(--red); }

.result {
  padding: 12px 14px;
  border: 1px solid var(--line);
  background: var(--panel);
  font-size: 16px;
  letter-spacing: 0.02em;
}
.result:empty { display: none; }
.result strong { color: var(--neon); }
.result.warn { border-color: var(--red); }
.result.warn strong { color: var(--red); }
.result ol { margin: 8px 0 0; padding-left: 22px; color: var(--muted); font-size: 15px; }
.result ol b { color: var(--text); font-weight: 600; }

/* ---------- picker ---------- */
.picker {
  position: absolute;
  z-index: 50;
  display: grid;
  grid-template-columns: repeat(3, 52px);
  gap: 4px;
  padding: 6px;
  background: var(--bg-2);
  border: 1px solid var(--neon);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.6);
}
.picker[hidden] { display: none; }
.picker button {
  height: 40px;
  background: transparent;
  border: 1px solid var(--line);
  color: var(--neon);
  font-size: 18px;
  font-weight: 600;
  cursor: pointer;
}
.picker button:hover, .picker button:focus-visible { background: var(--neon); color: var(--bg); outline: none; }
.picker button.danger { color: var(--red); grid-column: 1 / -1; font-size: 14px; letter-spacing: 0.08em; text-transform: uppercase; }
.picker button.danger:hover { background: var(--red); color: var(--bg); }

/* ---------- dialog ---------- */
.dialog {
  background: var(--bg-2);
  color: var(--text);
  border: 1px solid var(--neon);
  padding: 20px 24px;
  min-width: 280px;
}
.dialog::backdrop { background: rgba(0, 0, 0, 0.7); }
.dialog h2 { margin: 0 0 14px; color: var(--neon); text-transform: uppercase; letter-spacing: 0.08em; font-size: 20px; }
.dialog label { display: flex; align-items: center; gap: 12px; }
.dialog select { background: var(--bg); color: var(--neon); border: 1px solid var(--neon-dim); padding: 4px 8px; font: inherit; }
.dialog menu { display: flex; justify-content: flex-end; gap: 8px; padding: 0; margin: 20px 0 0; }


/* ---------- scan card ---------- */
.scan {
  display: flex;
  align-items: center;
  gap: 14px;
  margin: 14px auto 0;
  max-width: 640px;
  padding: 10px 12px;
  text-align: left;
  border: 1px solid var(--line);
  background: var(--panel);
}
.scan[hidden] { display: none; }
.scan.ok { border-color: var(--neon); }
.scan.warn { border-color: #f5b942; }
.scan.err { border-color: var(--red); }
.scan-thumb { position: relative; flex: none; width: 120px; aspect-ratio: 16 / 10; overflow: hidden; background: #000; border: 1px solid var(--line); }
.scan-thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
.scan-line { display: none; position: absolute; left: 0; right: 0; height: 2px; background: var(--cyan); box-shadow: 0 0 10px 3px rgba(94, 246, 255, 0.6); }
.scan.scanning .scan-line { display: block; animation: scanline 0.6s linear infinite alternate; }
.scan.scanning .scan-thumb img { filter: brightness(0.7) saturate(0.6); }
@keyframes scanline { from { top: 0; } to { top: calc(100% - 2px); } }
.scan-body { min-width: 0; flex: 1; }
.scan-title { font-weight: 600; letter-spacing: 0.04em; color: var(--text); }
.scan.scanning .scan-title { color: var(--cyan); }
.scan.scanning .scan-title::after { content: ""; display: inline-block; width: 8px; height: 1em; margin-left: 4px; vertical-align: -2px; background: var(--cyan); animation: blink 0.5s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }
.scan-report { list-style: none; margin: 4px 0 0; padding: 0; display: flex; flex-wrap: wrap; gap: 4px 14px; font-size: 15px; }
.scan-report li { display: flex; gap: 6px; align-items: baseline; }
.scan-report .mark { font-weight: 700; width: 1em; text-align: center; }
.scan-report .ok { color: var(--neon); }
.scan-report .warn { color: #f5b942; }
.scan-report .err { color: var(--red); }
.scan-actions { margin-top: 8px; }
.scan-actions[hidden] { display: none; }
.btn.tiny-inline { padding: 3px 10px; font-size: 13px; }
.scan.flash { animation: flash 0.7s ease-out; }
@keyframes flash { from { box-shadow: 0 0 0 3px var(--neon), 0 0 24px rgba(208, 237, 87, 0.5); } to { box-shadow: none; } }
.scan.err.flash { animation-name: flash-err; }
@keyframes flash-err { from { box-shadow: 0 0 0 3px var(--red), 0 0 24px rgba(255, 90, 95, 0.5); } to { box-shadow: none; } }

.workspace.stale { opacity: 0.35; pointer-events: none; transition: opacity 0.15s; }
.workspace.flash .panel, .workspace.flash .result { animation: flash 0.9s ease-out; }

@media (max-width: 560px) {
  .scan-thumb { width: 84px; }
}
@media (prefers-reduced-motion: reduce) {
  .scan.scanning .scan-line, .scan.flash, .workspace.flash .panel, .workspace.flash .result { animation: none; }
}

@media (max-width: 860px) {
  .workspace { grid-template-columns: minmax(0, 1fr); }
  main { padding: 16px; }
  .top { padding: 16px; }
  .matrix-wrap { padding: 22px 6px 12px; --gap: 10px; }
  .cell .n { font-size: 10px; top: 1px; right: 2px; }
  .daemon .value { min-width: 0; }
}

/* ---------- about / FAQ (crawlable copy) ---------- */
.about { max-width: 760px; margin: 40px auto 0; color: var(--muted); line-height: 1.5; }
.about h2 { margin: 0 0 8px; color: var(--neon); font-size: 20px; text-transform: uppercase; letter-spacing: 0.08em; }
.about h3 { margin: 24px 0 8px; color: var(--text); font-size: 17px; text-transform: uppercase; letter-spacing: 0.08em; }
.about p { margin: 0 0 8px; }
.about ol { margin: 0; padding-left: 22px; }
.about li { margin-bottom: 4px; }
.about details { border-left: 2px solid var(--line); padding: 6px 12px; margin-bottom: 6px; }
.about details[open] { border-left-color: var(--neon); }
.about summary { color: var(--text); cursor: pointer; font-weight: 600; }
.about details p { margin: 6px 0 0; }
.noscript { margin: 0; padding: 12px; text-align: center; color: var(--red); }