:root {
  --accent: var(--stamp);
  --muted: var(--ink-soft);
  --line: var(--rule);
  --bg: var(--paper);
  --severe: var(--bad);
  --panel: var(--sheet);
  --panel-2: #eef1f4;
  --accent-soft: rgba(90, 61, 153, 0.10);
  --ok-soft: rgba(46, 122, 87, 0.12);
  --bad-soft: rgba(194, 53, 61, 0.12);
}

body.demo { font-size: 17px; }
body.demo main { max-width: 1180px; }
body.demo header { max-width: 1180px; }

.hero { padding: 28px 0 8px; }
.eyebrow {
  margin: 0 0 6px;
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0;
}
.hero h2 { margin: 0 0 22px; font-size: clamp(1.7rem, 3.4vw, 2.5rem); letter-spacing: -0.02em; line-height: 1.15; }
.why-grid { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr); gap: 22px; align-items: stretch; }
.quote {
  margin: 0;
  padding: 22px 24px;
  border: 1px solid var(--line);
  border-left: 4px solid var(--severe);
  border-radius: 2px;
  background: var(--panel);
}
.quote blockquote { margin: 0 0 12px; font-size: 1.35rem; font-weight: 600; line-height: 1.3; }
.quote blockquote::before { content: "\201C"; color: var(--severe); }
.quote blockquote::after { content: "\201D"; color: var(--severe); }
.quote figcaption { color: var(--muted); font-size: 0.9rem; }
.why-list { margin: 0; padding: 0; list-style: none; counter-reset: why; display: grid; gap: 10px; }
.why-list li {
  counter-increment: why;
  display: grid;
  grid-template-columns: 30px 1fr;
  gap: 10px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--panel);
}
.why-list li::before {
  content: counter(why);
  display: grid;
  place-items: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 700;
  font-size: 0.85rem;
}
.lead { margin: 22px 0 0; font-size: 1.12rem; max-width: 72ch; }

.stepper {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  gap: 6px;
  margin: 28px 0 8px;
  padding: 10px 0;
  background: linear-gradient(var(--bg) 78%, rgba(15, 23, 32, 0));
  overflow-x: auto;
}
.stepper a {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1 0 auto;
  padding: 7px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  text-decoration: none;
  font-size: 0.9rem;
  transition: background 0.25s, color 0.25s, border-color 0.25s;
}
.stepper b {
  display: grid;
  place-items: center;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--panel-2);
  font-size: 0.78rem;
}
.stepper a.active, .stepper a:hover { color: var(--ink); border-color: var(--accent); background: var(--accent-soft); }
.stepper a.active b { background: var(--accent); color: var(--bg); }

.step {
  margin: 0 0 30px;
  padding: 26px 26px 28px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--panel);
  scroll-margin-top: 64px;
}
.leaf.leaf-more { display: block; color: var(--muted); }
.step-head { display: flex; gap: 18px; align-items: flex-start; margin-bottom: 20px; }
.step-num {
  flex: none;
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border-radius: 2px;
  background: var(--accent);
  color: var(--bg);
  font-size: 1.4rem;
  font-weight: 800;
}
.step-head h3 { margin: 0 0 4px; font-size: 1.45rem; letter-spacing: -0.01em; }
.step-head p { margin: 0; color: var(--muted); max-width: 78ch; }

.label {
  display: block;
  margin-bottom: 6px;
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 600;
  letter-spacing: 0.05em;
}
.meta { color: var(--muted); font-size: 0.86rem; margin: 6px 0 0; }
.muted { color: var(--muted); }
code { font-family: var(--mono); }
.hex {
  display: block;
  font-family: var(--mono);
  font-size: 0.95rem;
  line-height: 1.55;
  letter-spacing: 0.02em;
  overflow-wrap: anywhere;
  word-break: break-all;
  color: var(--ink);
}
.hex .d { color: #fff; background: var(--severe); border-radius: 2px; }
.hex.big { font-size: 1.08rem; color: var(--accent); }
.hex.grouped .g { display: inline-block; margin-right: 0.45em; }
.hex.grouped .g:last-child { margin-right: 0; }

.pill {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 700;
  white-space: nowrap;
  color: var(--muted);
  background: rgba(159, 176, 192, 0.12);
}
.pill.ok { color: var(--ok); background: var(--ok-soft); }
.pill.bad { color: var(--severe); background: var(--bad-soft); }
.check { margin: 10px 0 0; font-size: 0.9rem; color: var(--muted); }

.btn {
  display: inline-block;
  padding: 9px 16px;
  border: 1px solid var(--accent);
  border-radius: 2px;
  background: var(--accent-soft);
  color: var(--ink);
  font: inherit;
  font-size: 0.92rem;
  text-decoration: none;
  cursor: pointer;
  transition: background 0.2s;
}
.btn:hover { background: rgba(90, 61, 153, 0.18); }
.btn.ghost { border-color: var(--line); background: transparent; }
.actions { display: flex; flex-wrap: wrap; gap: 10px; margin: 18px 0 0; }

.picker { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 16px; }
.chip {
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--panel-2);
  color: var(--ink);
  font: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
}
.chip small { color: var(--muted); font-weight: 400; margin-left: 4px; }
.chip[aria-pressed="true"] { border-color: var(--accent); background: var(--accent-soft); }

.pair { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.card { padding: 18px 20px; border: 1px solid var(--line); border-radius: 2px; background: var(--bg); }
.card h4 { margin: 0 0 12px; font-size: 1.15rem; }
.kv { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr); gap: 8px 14px; margin: 0; }
.kv dt { color: var(--muted); font-size: 0.9rem; }
.kv dd { margin: 0; overflow-wrap: anywhere; }
.kv dd.num { text-align: left; }
.strong { font-weight: 700; font-size: 1.08rem; }

.flow { display: grid; gap: 18px; }
.flow-row {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) 96px minmax(0, 1fr);
  gap: 14px;
  align-items: center;
}
.json {
  margin: 0;
  max-height: 210px;
  overflow: auto;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--bg);
  font-family: var(--mono);
  font-size: 0.8rem;
  line-height: 1.5;
  color: var(--muted);
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  word-break: break-all;
}
.json mark { background: var(--accent-soft); color: var(--ink); border-radius: 3px; padding: 0 2px; }
.flow-arrow, .merge-arrow {
  position: relative;
  display: grid;
  place-items: center;
  min-height: 46px;
}
.flow-arrow::before {
  content: "";
  position: absolute;
  left: 4px;
  right: 10px;
  top: 50%;
  border-top: 2px solid var(--accent);
}
.flow-arrow::after {
  content: "";
  position: absolute;
  right: 2px;
  top: calc(50% - 6px);
  border: 6px solid transparent;
  border-left: 9px solid var(--accent);
  border-right: 0;
}
.flow-arrow span, .merge-arrow span {
  position: relative;
  z-index: 1;
  padding: 2px 8px;
  border-radius: 6px;
  background: var(--panel);
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.74rem;
  font-weight: 700;
}
.flow-out {
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--bg);
}

.merge { display: grid; gap: 10px; justify-items: stretch; }
.leaves { margin: 0; padding: 0; list-style: none; display: grid; gap: 8px; }
.leaf {
  display: grid;
  grid-template-columns: 30px minmax(150px, 0.8fr) minmax(0, 2fr) auto;
  gap: 12px;
  align-items: center;
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--bg);
  transition: border-color 0.3s, background 0.3s;
}
.leaf.selected { border-color: var(--accent); background: var(--accent-soft); }
.leaf-order { color: var(--muted); font-family: var(--mono); font-weight: 700; }
.leaf-name { font-weight: 600; }
.merge-join { text-align: center; }
.merge-join .label { margin: 4px 0 0; }
.merge-arrow::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 8px;
  left: 50%;
  border-left: 2px solid var(--accent);
}
.merge-arrow::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: calc(50% - 6px);
  border: 6px solid transparent;
  border-top: 9px solid var(--accent);
  border-bottom: 0;
}
.digest-box {
  justify-self: center;
  width: min(100%, 720px);
  padding: 18px 20px;
  border: 1px solid var(--accent);
  border-radius: 2px;
  background: var(--bg);
  text-align: center;
}

.compare {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  gap: 18px;
  align-items: center;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--bg);
  transition: border-color 0.4s, box-shadow 0.4s;
}
.compare .side { min-width: 0; }
.compare .hex { font-size: 1.05rem; }
.compare.ok { border-color: var(--ok); box-shadow: 0 0 0 3px var(--ok-soft); }
.compare.bad, .compare.error { border-color: var(--severe); box-shadow: 0 0 0 3px var(--bad-soft); }
.verdict {
  padding: 10px 16px;
  border-radius: 999px;
  background: var(--panel-2);
  color: var(--muted);
  font-weight: 800;
  text-align: center;
  white-space: nowrap;
}
.compare.ok .verdict { background: var(--ok-soft); color: var(--ok); }
.compare.bad .verdict, .compare.error .verdict { background: var(--bad-soft); color: var(--severe); }
.facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin: 18px 0 0;
}
.facts div { padding: 12px 14px; border: 1px solid var(--line); border-radius: 2px; background: var(--bg); min-width: 0; }
.facts dt { color: var(--muted); font-size: 0.86rem; margin-bottom: 4px; }
.facts dd { margin: 0; overflow-wrap: anywhere; }

.tamper { display: grid; grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.4fr); gap: 20px; align-items: start; }
.tamper-form {
  display: grid;
  gap: 14px;
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--bg);
}
.tamper-target { margin: 0; }
.tamper-form label { display: grid; gap: 6px; color: var(--muted); font-size: 0.88rem; }
.tamper-form input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--panel);
  color: var(--ink);
  font-family: var(--mono);
  font-size: 1.2rem;
}
.tamper-form input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.tamper-form .btn { justify-self: start; }
.row-preview {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto auto;
  gap: 14px;
  align-items: center;
  padding: 14px 18px;
  border: 1px solid var(--line);
  border-left: 5px solid var(--ok);
  border-radius: 2px;
  background: var(--bg);
  font-size: 1.05rem;
  transition: border-color 0.3s, background 0.3s;
}
.row-preview.tampered { border-left-color: var(--severe); background: var(--bad-soft); }
.row-name { font-weight: 600; }
.row-price { font-family: var(--mono); }
.row-preview .integrity { font-size: 0.92rem; padding: 4px 12px; }
.checks { margin: 14px 0 0; padding: 0; list-style: none; display: grid; gap: 10px; }
.check-item {
  display: grid;
  gap: 6px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--bg);
  transition: border-color 0.3s;
}
.check-item.bad { border-color: var(--severe); }
.check-title { font-weight: 600; }
.check-hex { display: grid; grid-template-columns: 150px minmax(0, 1fr); gap: 10px; align-items: baseline; }
.check-hex .label { margin: 0; }
.check-hex .hex { font-size: 0.86rem; }

.timeline { position: relative; margin: 18px 0 0; padding: 0 0 0 28px; list-style: none; }
.timeline::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 6px;
  bottom: 6px;
  border-left: 2px solid var(--line);
}
.tl-item { position: relative; margin: 0 0 16px; }
.tl-item:last-child { margin-bottom: 0; }
.tl-dot {
  position: absolute;
  left: -26px;
  top: 16px;
  width: 16px;
  height: 16px;
  border: 3px solid var(--panel);
  border-radius: 50%;
  background: var(--muted);
}
.tl-item.anchor .tl-dot { background: var(--accent); }
.tl-item.current .tl-dot { background: var(--ok); box-shadow: 0 0 0 4px var(--ok-soft); }
.tl-body { padding: 14px 16px; border: 1px solid var(--line); border-radius: 2px; background: var(--bg); }
.tl-item.current .tl-body { border-color: var(--ok); }
.tl-body p { margin: 0; }
.tl-body .hex { margin-top: 8px; font-size: 0.86rem; color: var(--muted); }
.tl-title { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; font-weight: 700; font-size: 1.05rem; }
.tl-count { color: var(--accent); }
.tl-count.down { color: var(--watch); }
.tl-count s { color: var(--muted); font-weight: 400; }
.tl-note {
  margin-top: 10px !important;
  padding: 8px 12px;
  border-left: 3px solid var(--watch);
  background: rgba(217, 164, 65, 0.1);
  border-radius: 0 8px 8px 0;
}

@media (max-width: 860px) {
  .why-grid, .pair, .tamper { grid-template-columns: 1fr; }
  .flow-row { grid-template-columns: 1fr; }
  .flow-arrow { min-height: 40px; }
  .flow-arrow::before { left: 50%; right: auto; top: 0; bottom: 8px; border-top: 0; border-left: 2px solid var(--accent); }
  .flow-arrow::after { right: auto; left: calc(50% - 6px); top: auto; bottom: 0; border: 6px solid transparent; border-top: 9px solid var(--accent); border-bottom: 0; }
  .compare { grid-template-columns: 1fr; }
  .verdict { justify-self: center; }
  .facts { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .leaf { grid-template-columns: 26px minmax(0, 1fr) auto; }
  .leaf .hex { grid-column: 1 / -1; }
}

@media (max-width: 560px) {
  body.demo { font-size: 16px; }
  header, .filters, main, footer { padding-left: 16px; padding-right: 16px; }
  .step { padding: 18px 16px 20px; border-radius: 2px; }
  .step-head { gap: 12px; }
  .step-num { width: 38px; height: 38px; font-size: 1.15rem; }
  .step-head h3 { font-size: 1.2rem; }
  .stepper span { display: none; }
  .stepper a { flex: 1 0 auto; justify-content: center; padding: 6px; }
  .facts { grid-template-columns: 1fr; }
  .kv { grid-template-columns: 1fr; gap: 2px; }
  .kv dd { margin-bottom: 8px; }
  .row-preview { grid-template-columns: 1fr auto; }
  .row-name { grid-column: 1 / -1; }
  .check-hex { grid-template-columns: 1fr; gap: 2px; }
  .quote blockquote { font-size: 1.15rem; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; scroll-behavior: auto !important; }
}