:root {
  --paper: #f3eee4;
  --paper-2: #e8e0d2;
  --ink: #141310;
  --muted: #6a6256;
  --rule: #c4b9a6;
  --stamp: #8f1d1d;
  --ok: #1c4a32;
  --warn: #6b5420;
  --sans: "Barlow Condensed", "Arial Narrow", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--mono);
  font-size: 14px;
  line-height: 1.55;
}
a { color: inherit; }
img { display: block; max-width: 100%; }
button, textarea { font: inherit; color: inherit; }

.page { min-height: 100vh; }

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 14px 28px;
  border-bottom: 1px solid var(--ink);
  position: sticky;
  top: 0;
  background: var(--paper);
  z-index: 8;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-family: var(--sans);
  font-weight: 700;
  letter-spacing: 0.08em;
  font-size: 22px;
}
.brand img { width: 34px; height: 34px; object-fit: contain; }
.nav nav { display: flex; gap: 18px; align-items: center; }
.nav nav a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  text-decoration: none;
  font-size: 12px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.nav nav a:hover { text-decoration: underline; }

.hero, .panel, .block { padding: 56px 28px; max-width: 1080px; margin: 0 auto; }
.hero { padding-top: 72px; border-bottom: 1px solid var(--rule); }
.file-tag, .kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 16px;
}
.hero h1, .panel h2, .block h2 {
  font-family: var(--sans);
  font-weight: 700;
  letter-spacing: -0.02em;
  text-transform: uppercase;
  line-height: 0.92;
}
.hero h1 { font-size: clamp(56px, 9vw, 104px); margin-bottom: 20px; }
.hero-copy { max-width: 560px; color: var(--muted); margin-bottom: 28px; }
.hero-actions, .actions { display: flex; gap: 10px; flex-wrap: wrap; }

.stamp-btn, .ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 16px;
  border: 1px solid var(--ink);
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 12px;
  background: var(--ink);
  color: var(--paper);
  cursor: pointer;
}
.ghost { background: transparent; color: var(--ink); }
.stamp-btn:disabled { opacity: 0.4; cursor: not-allowed; }
.stamp-btn:hover:not(:disabled), .ghost:hover { background: var(--stamp); color: var(--paper); border-color: var(--stamp); }

.panel { border-bottom: 1px solid var(--rule); }
.panel-head {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  align-items: flex-end;
  margin-bottom: 18px;
}
.panel-head h2 { font-size: 42px; }
.meta { display: flex; gap: 22px; font-size: 11px; }
.meta dt { color: var(--muted); text-transform: uppercase; letter-spacing: 0.08em; }
.lede { max-width: 640px; color: var(--muted); margin-bottom: 18px; }
.lede code { background: var(--paper-2); padding: 0 4px; }

.tfile {
  display: grid;
  grid-template-columns: 72px 1fr auto;
  gap: 18px;
  align-items: center;
  border: 1px solid var(--ink);
  background: var(--paper-2);
  padding: 18px 20px;
  animation: rise 0.35s ease;
}
.tfile-skel {
  min-height: 112px;
  background: repeating-linear-gradient(
    90deg,
    var(--paper-2) 0,
    var(--paper) 40px,
    var(--paper-2) 80px
  );
  background-size: 200% 100%;
  animation: shimmer 1.2s linear infinite;
}
.tfile-av {
  width: 72px;
  height: 72px;
  object-fit: contain;
  background: var(--paper);
  border: 1px solid var(--ink);
  padding: 8px;
}
.tfile-title {
  font-family: var(--sans);
  font-size: 28px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  line-height: 1;
  margin-bottom: 4px;
}
.tfile-title span {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0;
  text-transform: none;
  color: var(--muted);
  margin-left: 8px;
}
.tfile-ca {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 8px 0 10px;
  color: var(--muted);
  font-size: 12px;
}
.tfile-ca button,
.tfile-actions a {
  border: 1px solid var(--ink);
  background: transparent;
  padding: 4px 9px;
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-decoration: none;
  cursor: pointer;
}
.tfile-ca button:hover,
.tfile-actions a:hover { background: var(--stamp); color: var(--paper); border-color: var(--stamp); }
.tfile-actions { display: flex; gap: 8px; flex-wrap: wrap; }
.tfile-actions .buy { background: var(--ink); color: var(--paper); }
.tfile-stats {
  display: grid;
  grid-template-columns: repeat(2, auto);
  gap: 18px;
  text-align: right;
}
.tfile-stats em {
  display: block;
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 4px;
}
.tfile-stats b {
  font-family: var(--sans);
  font-size: 22px;
  letter-spacing: 0.03em;
}

@keyframes shimmer {
  0% { background-position: 100% 0; }
  100% { background-position: -100% 0; }
}

.examples {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin-bottom: 12px;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.examples button {
  background: var(--paper-2);
  border: 1px solid var(--rule);
  padding: 5px 9px;
  cursor: pointer;
}
.examples button:hover { border-color: var(--ink); }

textarea {
  width: 100%;
  min-height: 220px;
  padding: 14px;
  border: 1px solid var(--ink);
  background: #faf6ee;
  resize: vertical;
  line-height: 1.45;
}

.after {
  margin-top: 18px;
  max-width: 720px;
  color: var(--muted);
}

.chat {
  border: 1px solid var(--ink);
  background: #faf6ee;
}
.chat-log {
  min-height: 280px;
  max-height: 420px;
  overflow: auto;
  padding: 16px;
  display: grid;
  gap: 12px;
}
.bubble {
  max-width: 86%;
  padding: 10px 12px;
  border: 1px solid var(--rule);
  background: var(--paper);
  white-space: pre-wrap;
  word-break: break-word;
}
.bubble[data-who="alibi"] { border-color: var(--ink); }
.bubble[data-who="you"] {
  justify-self: end;
  background: var(--paper-2);
}
.bubble small {
  display: block;
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 6px;
}
.bubble.pending { color: var(--muted); }
.chat-form {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px;
  padding: 12px;
  border-top: 1px solid var(--ink);
  align-items: end;
}
.chat-form textarea {
  min-height: 56px;
  max-height: 140px;
  padding: 10px 12px;
}
.chat-form .stamp-btn { min-width: 96px; }
.actions { margin: 12px 0 8px; }

.report {
  position: relative;
  margin-top: 22px;
  padding: 22px 20px 16px;
  border: 1px solid var(--ink);
  background: var(--paper-2);
  animation: rise 0.35s ease;
}
.stamp {
  position: absolute;
  top: 16px;
  right: 16px;
  font-family: var(--sans);
  font-size: 28px;
  font-weight: 700;
  letter-spacing: 0.08em;
  border: 3px solid currentColor;
  padding: 4px 10px;
  transform: rotate(-8deg);
}
.verdict-valid .stamp { color: var(--ok); }
.verdict-invalid .stamp { color: var(--stamp); }
.verdict-unverified .stamp { color: var(--warn); }
.summary { max-width: 70%; margin-bottom: 16px; }
table { width: 100%; border-collapse: collapse; margin: 12px 0 18px; }
th, td { text-align: left; padding: 7px 8px; border-bottom: 1px solid var(--rule); vertical-align: top; }
th { font-size: 11px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--muted); }
td:first-child { width: 140px; color: var(--muted); }
.checks { list-style: none; display: grid; gap: 10px; }
.checks li {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 4px 12px;
  padding: 10px 0;
  border-top: 1px solid var(--rule);
}
.checks b { font-weight: 500; }
.checks span { text-transform: uppercase; font-size: 11px; letter-spacing: 0.06em; }
.checks p { grid-column: 1 / -1; color: var(--muted); }
.checks li[data-status="pass"] span { color: var(--ok); }
.checks li[data-status="fail"] span { color: var(--stamp); }
.checks li[data-status="skip"] span { color: var(--warn); }
.banner.fail { margin-top: 12px; color: var(--stamp); }

.block { border-bottom: 1px solid var(--rule); }
.block h2 { font-size: 42px; margin-bottom: 20px; }
.steps { list-style: none; display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.steps b { display: block; font-family: var(--sans); font-size: 22px; letter-spacing: 0.04em; margin-bottom: 8px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.grid-3 article { border: 1px solid var(--ink); padding: 16px; }
.grid-3 h3 { font-family: var(--sans); font-size: 26px; letter-spacing: 0.04em; margin: 10px 0 8px; text-transform: uppercase; }
.rules { list-style: none; }
.rules li { padding: 10px 0; border-top: 1px solid var(--rule); }

.diagram {
  display: grid;
  grid-template-columns: 1fr 24px 1fr 24px 1fr;
  gap: 10px;
  align-items: stretch;
}
.diagram div {
  border: 1px solid var(--ink);
  padding: 14px;
  min-height: 110px;
}
.diagram .wide {
  grid-column: 1 / -1;
  border-style: dashed;
  color: var(--muted);
}
.diagram small { display: block; font-size: 10px; letter-spacing: 0.1em; text-transform: uppercase; margin-bottom: 6px; }
.diagram b { display: block; font-family: var(--sans); font-size: 24px; text-transform: uppercase; }
.diagram i { align-self: center; height: 1px; background: var(--ink); }

.foot {
  padding: 28px;
  display: grid;
  gap: 8px;
  font-size: 12px;
  color: var(--muted);
}
.foot b { color: var(--ink); font-family: var(--sans); font-size: 20px; letter-spacing: 0.06em; margin-right: 10px; }
.foot-links { display: flex; gap: 16px; }
.foot a { text-underline-offset: 3px; }

.sr {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
}

@keyframes rise {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: none; }
}

@media (max-width: 860px) {
  .nav { flex-wrap: wrap; }
  .nav nav { flex-wrap: wrap; gap: 12px; }
  .panel-head, .steps, .grid-3, .diagram, .tfile { grid-template-columns: 1fr; }
  .tfile-stats { text-align: left; }
  .diagram i { display: none; }
  .summary { max-width: 100%; padding-right: 0; }
  .stamp { position: static; display: inline-block; margin-bottom: 10px; }
  .chat-form { grid-template-columns: 1fr; }
}