:root {
  --bg: #070b10;
  --fg: #eef3fb;
  --muted: #8b9bb0;
  --alive: #3dd68c;
  --wiped: #ff4d4d;
  --wiped-glow: rgba(255, 77, 77, 0.45);
  --card: #121821;
  --line: #273141;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, sans-serif;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background:
    radial-gradient(900px 420px at 15% -5%, #2a1020, transparent),
    radial-gradient(1000px 500px at 80% 0%, #132038, transparent),
    var(--bg);
  color: var(--fg);
  min-height: 100vh;
  padding: 2rem 1.25rem 4rem;
}
.hero { max-width: 880px; margin: 0 auto 1.25rem; }
.eyebrow { color: var(--muted); letter-spacing: 0.1em; text-transform: uppercase; font-size: 0.72rem; margin: 0; }
h1 { font-size: clamp(1.7rem, 3.2vw, 2.55rem); line-height: 1.12; margin: 0.45rem 0; }
.sub { color: var(--muted); margin: 0; }
.sub .alive { color: var(--alive); font-weight: 600; }
.sub .wiped { color: var(--wiped); font-weight: 600; }

.rail-wrap { max-width: 880px; margin: 0 auto 1.25rem; overflow-x: auto; padding-bottom: 0.35rem; }
.rail {
  display: flex; align-items: center; gap: 0; min-height: 96px;
  padding: 1rem 0.5rem; position: relative;
}
.rail::before {
  content: ""; position: absolute; left: 1rem; right: 1rem; top: 50%;
  height: 3px; background: linear-gradient(90deg, #2a3a50, #4a2030); border-radius: 2px;
}
.rail .node {
  position: relative; z-index: 1; flex: 0 0 auto; width: 150px;
  display: grid; justify-items: center; gap: 0.35rem;
  opacity: 0; transform: scale(0.7); animation: popin 0.4s ease forwards;
}
.rail .mark {
  width: 34px; height: 34px; border-radius: 50%; display: grid; place-items: center;
  font-weight: 800; font-size: 0.95rem; border: 2px solid transparent;
}
.rail .node.alive .mark { background: var(--alive); color: #062416; box-shadow: 0 0 0 4px rgba(61,214,140,0.15); }
.rail .node.wiped .mark {
  background: var(--wiped); color: #2a0505; border-radius: 8px;
  box-shadow: 0 0 24px var(--wiped-glow); animation: pulse 1.1s ease infinite;
}
.rail .cap {
  font-size: 0.72rem; color: var(--muted); text-align: center; max-width: 140px;
  line-height: 1.25;
}
.rail .node.wiped .cap { color: #ffb4b4; font-weight: 600; }

.controls, .meta, .timeline, .legend, footer { max-width: 880px; margin: 0 auto; }
.controls { display: flex; flex-wrap: wrap; gap: 0.75rem; align-items: end; margin-bottom: 1.1rem; }
label { display: grid; gap: 0.35rem; font-size: 0.85rem; color: var(--muted); }
select, button {
  background: var(--card); color: var(--fg); border: 1px solid var(--line);
  border-radius: 10px; padding: 0.55rem 0.8rem; font: inherit;
}
button { cursor: pointer; }
button:hover { border-color: #4a5d78; }
.hint { color: var(--muted); font-size: 0.85rem; align-self: center; }
.meta { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 0.9rem 1rem; margin-bottom: 1rem; }
.timeline { list-style: none; padding: 0; margin: 0; position: relative; }
.timeline::before {
  content: ""; position: absolute; left: 18px; top: 8px; bottom: 8px; width: 2px; background: var(--line);
}
.timeline li {
  position: relative; margin: 0 0 0.9rem 0; padding: 0.85rem 1rem 0.85rem 3rem;
  background: var(--card); border: 1px solid var(--line); border-radius: 14px;
  opacity: 0; transform: translateY(8px); animation: pop 0.45s ease forwards;
}
.timeline li.wiped {
  border-color: color-mix(in srgb, var(--wiped) 55%, var(--line));
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--wiped) 20%, transparent),
              0 0 28px rgba(255, 77, 77, 0.08);
}
.timeline li .dot {
  position: absolute; left: 10px; top: 1.1rem; width: 18px; height: 18px; border-radius: 50%;
  display: grid; place-items: center; font-size: 0.7rem; font-weight: 700;
}
.timeline li.alive .dot { background: var(--alive); color: #062416; }
.timeline li.wiped .dot { background: var(--wiped); color: #2a0505; border-radius: 4px; }
.badge {
  display: inline-block; font-size: 0.68rem; font-weight: 800; letter-spacing: 0.04em;
  padding: 0.12rem 0.4rem; border-radius: 999px; margin-right: 0.4rem; vertical-align: 0.1rem;
}
.badge.alive { background: rgba(61,214,140,0.15); color: var(--alive); }
.badge.wiped { background: rgba(255,77,77,0.18); color: #ff9a9a; }
.msg { font-weight: 600; }
.row { display: flex; flex-wrap: wrap; gap: 0.5rem 1rem; color: var(--muted); font-size: 0.85rem; margin-top: 0.35rem; }
.note { margin-top: 0.45rem; color: #ffb4b4; font-size: 0.9rem; }
.legend { margin-top: 1rem; color: var(--muted); }
.legend .alive { color: var(--alive); margin-right: 1rem; }
.legend .wiped { color: var(--wiped); }
footer { margin-top: 2rem; color: var(--muted); }
footer code { display: inline-block; background: var(--card); padding: 0.4rem 0.65rem; border-radius: 8px; color: var(--fg); }
@keyframes pop { to { opacity: 1; transform: none; } }
@keyframes popin { to { opacity: 1; transform: none; } }
@keyframes pulse {
  0%, 100% { box-shadow: 0 0 10px var(--wiped-glow); }
  50% { box-shadow: 0 0 26px var(--wiped-glow); }
}

.hero-gif {
  margin: 1rem 0 0;
  padding: 0;
  max-width: 880px;
}
.hero-gif img {
  display: block;
  width: min(100%, 880px);
  height: auto;
  border-radius: 14px;
  border: 1px solid color-mix(in srgb, var(--wiped) 35%, var(--line));
  box-shadow:
    0 0 0 1px rgba(255, 77, 77, 0.08),
    0 12px 40px rgba(0, 0, 0, 0.35),
    0 0 48px rgba(255, 77, 77, 0.14);
  background: #070b10;
}
.hero-gif figcaption {
  margin-top: 0.55rem;
  color: var(--muted);
  font-size: 0.82rem;
  letter-spacing: 0.01em;
}


.how-to {
  max-width: 880px;
  margin: 0 auto 1.25rem;
  padding: 0.85rem 1rem;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
}
.how-to-title {
  margin: 0 0 0.45rem;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}
.how-to ol {
  margin: 0;
  padding-left: 1.2rem;
  color: var(--fg);
  font-size: 0.95rem;
  line-height: 1.45;
}
.how-to li { margin: 0.25rem 0; }
.how-to .alive { color: var(--alive); font-weight: 600; }
.how-to .wiped { color: var(--wiped); font-weight: 600; }

.share-card {
  max-width: 880px;
  margin: 0 auto 1.25rem;
  padding: 0.85rem 1rem 1rem;
  background: var(--card);
  border: 1px solid color-mix(in srgb, var(--alive) 25%, var(--line));
  border-radius: 14px;
}
.share-card-title {
  margin: 0 0 0.45rem;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}
.share-card pre {
  margin: 0 0 0.65rem;
  white-space: pre-wrap;
  word-break: break-word;
  font: inherit;
  line-height: 1.4;
  color: var(--fg);
}
.share-copy {
  background: var(--card);
  color: var(--fg);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.45rem 0.8rem;
  font: inherit;
  cursor: pointer;
}
.share-copy:hover { border-color: #4a5d78; }

.showcase {
  max-width: 880px;
  margin: 0 auto 1.25rem;
  padding: 0.85rem 1rem 1rem;
  background: var(--card);
  border: 1px solid color-mix(in srgb, var(--wiped) 28%, var(--line));
  border-radius: 14px;
}
.showcase-title {
  margin: 0 0 0.45rem;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}
.showcase-body {
  margin: 0 0 0.65rem;
  color: var(--fg);
  font-size: 0.95rem;
  line-height: 1.45;
}
.showcase pre {
  margin: 0 0 0.65rem;
  white-space: pre-wrap;
  word-break: break-word;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.82rem;
  line-height: 1.45;
  color: var(--fg);
  background: #0a1018;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.7rem 0.85rem;
}
.showcase-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  align-items: center;
  margin-bottom: 0.55rem;
}
.showcase-link {
  color: var(--alive);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
}
.showcase-link:hover { text-decoration: underline; }
.showcase-note {
  margin: 0;
  color: var(--muted);
  font-size: 0.85rem;
  line-height: 1.4;
}
.showcase-note .wiped { color: var(--wiped); font-weight: 600; }

.fw-preview {
  max-width: 880px;
  margin: 0 auto 1.25rem;
  padding: 0.85rem 1rem 1rem;
  background: var(--card);
  border: 1px solid color-mix(in srgb, var(--wiped) 22%, var(--alive) 18%, var(--line));
  border-radius: 14px;
}
.fw-preview-title {
  margin: 0 0 0.35rem;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}
.fw-preview-hook {
  margin: 0 0 0.45rem;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--fg);
}
.fw-preview-body {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.45;
}
.fw-preview .alive { color: var(--alive); font-weight: 600; }
.fw-preview .wiped { color: var(--wiped); font-weight: 600; }

.dual-wrap {
  max-width: 880px;
  margin: 0 auto 1.25rem;
}
.dual-caption {
  margin: 0 0 0.65rem;
  text-align: center;
  font-weight: 700;
  color: var(--fg);
  letter-spacing: 0.01em;
}
.dual-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}
@media (max-width: 720px) {
  .dual-grid { grid-template-columns: 1fr; }
}
.dual-side {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 0.35rem 0.25rem 0.55rem;
  overflow-x: auto;
}
.dual-label {
  margin: 0.45rem 0.65rem 0;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 700;
}
.dual-label.wiped-label { color: var(--wiped); }
.dual-label.alive-label { color: var(--alive); }
.dual-side .rail { min-height: 110px; padding-top: 0.65rem; }
.rail .node.absent .mark {
  background: #1a2230;
  color: var(--muted);
  border: 1px dashed var(--line);
  box-shadow: none;
}
.rail .node.absent .cap { color: var(--muted); }
.rail .shared-sha {
  display: inline-block;
  margin-top: 0.15rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.68rem;
  color: #ffd4a8;
}
.badge.absent {
  background: rgba(139, 155, 176, 0.15);
  color: var(--muted);
}
.timeline li.dual-hit {
  border-color: color-mix(in srgb, var(--wiped) 40%, var(--alive) 25%, var(--line));
  box-shadow:
    inset 0 0 0 1px color-mix(in srgb, var(--alive) 12%, transparent),
    0 0 28px rgba(255, 77, 77, 0.06);
}
.timeline li.absent .dot {
  background: #1a2230;
  color: var(--muted);
  border: 1px dashed var(--line);
}

.fw-preview-fig { margin: 0.75rem 0 0; padding: 0; }
.fw-preview-fig img {
  display: block;
  width: min(100%, 880px);
  height: auto;
  border-radius: 12px;
  border: 1px solid color-mix(in srgb, var(--wiped) 28%, var(--alive) 18%, var(--line));
  background: #070b10;
}

.fw-preview-actions { margin: 0.75rem 0 0; }
.fw-preview-actions .share-copy { font-size: 0.95rem; }

.real-world {
  max-width: 720px;
  margin: 1.25rem auto 0;
  padding: 0.9rem 1rem;
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 10px;
  background: rgba(255,255,255,0.03);
}
.real-world-title {
  margin: 0 0 0.5rem;
  font-size: 0.85rem;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  opacity: 0.8;
}
.real-world ul {
  margin: 0;
  padding-left: 1.1rem;
  font-size: 0.92rem;
  line-height: 1.45;
}
.real-world-note {
  margin: 0.65rem 0 0;
  font-size: 0.82rem;
  opacity: 0.75;
  line-height: 1.4;
}