@import url('https://fonts.googleapis.com/css2?family=Instrument+Serif:ital@0;1&family=IBM+Plex+Sans:wght@400;500;600&family=IBM+Plex+Mono:wght@400;500&display=swap');

:root {
  --bg: #ffffff;
  --ink: #14141a;
  --muted: #5b5b66;
  --line: #ececf0;
  --pink: #e6007e;
  --pink-deep: #b3005f;
  --pink-soft: #e6007e12;
  --green: #2e7d32;
  --amber: #c77b1a;
  --red: #c0392b;
  --radius: 12px;
  --shadow: 0 2px 10px rgba(20, 20, 26, 0.07);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: 'IBM Plex Sans', system-ui, sans-serif;
  line-height: 1.55;
}

.site-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 20px 28px;
  border-bottom: 1px solid var(--line);
}
.wordmark { font-size: 22px; font-weight: 600; letter-spacing: -0.01em; }
.wm-ink { color: var(--ink); }
.wm-pink { color: var(--pink); }
.brand-by { color: var(--muted); font-size: 13px; }
.head-right { margin-left: auto; font-size: 13px; }
.head-right a { color: var(--pink-deep); text-decoration: none; font-weight: 500; }
.head-right a:hover { text-decoration: underline; }

.wrap { max-width: 1080px; margin: 0 auto; padding: 32px 28px 64px; }

.hero {
  font-family: 'Instrument Serif', Georgia, serif;
  font-size: clamp(30px, 4.6vw, 46px);
  line-height: 1.12;
  margin: 8px 0 10px;
  font-weight: 400;
}
.hero em { color: var(--pink); font-style: italic; }
.subhead { color: var(--muted); margin: 0 0 22px; max-width: 60ch; }

.demo-note {
  border: 1px solid var(--line);
  border-left: 3px solid var(--pink);
  background: var(--pink-soft);
  border-radius: 8px;
  padding: 12px 16px;
  font-size: 13.5px;
  margin: 0 0 26px;
  max-width: 78ch;
}
.demo-note strong { color: var(--pink-deep); }

.examples { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 30px; }
.ex-label { color: var(--muted); font-size: 13px; }
.chip {
  font: inherit;
  font-size: 13.5px;
  padding: 7px 14px;
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 999px;
  cursor: pointer;
  transition: border-color .15s, color .15s;
}
.chip:hover, .chip.on { border-color: var(--pink); color: var(--pink-deep); }

.results-grid { display: grid; grid-template-columns: 260px 1fr; gap: 28px; align-items: start; }
@media (max-width: 820px) { .results-grid { grid-template-columns: 1fr; } }

.mol-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow);
  text-align: center;
}
.mol-name { font-weight: 600; margin-bottom: 6px; }
.mol-smiles {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11.5px;
  color: var(--muted);
  word-break: break-all;
  display: block;
  margin-top: 8px;
}

.legend {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px 16px;
  margin-bottom: 18px;
  font-size: 13px;
}
.legend strong { display: block; margin-bottom: 8px; font-size: 13px; }
.legend-keys { display: flex; gap: 16px; flex-wrap: wrap; color: var(--muted); }
.key { display: inline-block; width: 10px; height: 10px; border-radius: 2px; margin-right: 5px; vertical-align: middle; }
.key.pink { background: var(--pink); }
.key.dash { background: var(--muted); }
.key.tag-model { background: var(--pink); }
.key.tag-heur { background: #d8d8de; }

.stage-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px 18px;
  margin-bottom: 12px;
  opacity: .45;
  transition: opacity .3s;
  box-shadow: var(--shadow);
}
.stage-card.active { opacity: 1; }
.stage-card.skipped { opacity: .5; }
.stage-head { display: flex; align-items: center; gap: 10px; margin-bottom: 10px; }
.stage-name { font-weight: 600; font-size: 15px; }
.stage-tag {
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: .06em;
  padding: 2px 7px;
  border-radius: 4px;
  font-weight: 600;
}
.stage-tag.model { background: var(--pink); color: #fff; }
.stage-tag.heuristic { background: #ececf0; color: #55555f; }
.stage-badge {
  margin-left: auto;
  font-family: 'IBM Plex Mono', monospace;
  font-weight: 500;
  font-size: 14px;
  padding: 2px 9px;
  border-radius: 6px;
}
.stage-badge.green { background: #eaf5ea; color: var(--green); }
.stage-badge.amber { background: #fdf3e3; color: var(--amber); }
.stage-badge.red { background: #fbeceb; color: var(--red); }

.meter { position: relative; display: block; height: 8px; background: #f2f2f6; border-radius: 999px; margin-bottom: 10px; }
.meter.mini { width: 130px; display: inline-block; vertical-align: middle; }
.meter-fill { position: absolute; left: 0; top: 0; bottom: 0; width: 0; background: var(--pink); border-radius: 999px; transition: width .5s ease; }
.tick-pass { position: absolute; top: -2px; bottom: -2px; width: 2px; background: var(--pink-deep); }
.tick-floor { position: absolute; top: -2px; bottom: -2px; width: 2px; background: var(--muted); opacity: .55; }
.stage-text { font-size: 13.5px; color: var(--muted); margin: 0; }

.verdict-card { display: flex; gap: 16px; align-items: flex-start; border-radius: var(--radius); padding: 20px 22px; margin-top: 18px; border: 1px solid var(--line); }
.verdict-card.pass { background: #f4fbf4; border-color: #bcdcbc; }
.verdict-card.reject { background: #fdf5f4; border-color: #f0c6c2; }
.verdict-mark { font-size: 26px; line-height: 1; }
.verdict-card.pass .verdict-mark { color: var(--green); }
.verdict-card.reject .verdict-mark { color: var(--red); }
.verdict-title { margin: 0 0 4px; font-size: 19px; }
.verdict-reason { margin: 0; font-size: 14px; color: var(--muted); }

.section { margin-top: 56px; }
.section h2 { font-family: 'Instrument Serif', Georgia, serif; font-weight: 400; font-size: 27px; margin: 0 0 6px; }
.section p { color: var(--muted); max-width: 74ch; }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 14px; margin-top: 18px; }
.card { border: 1px solid var(--line); border-radius: var(--radius); padding: 16px 18px; }
.card h3 { margin: 0 0 6px; font-size: 15px; }
.card p { margin: 0; font-size: 13.5px; }

.foot { margin-top: 60px; padding-top: 22px; border-top: 1px solid var(--line); color: var(--muted); font-size: 13px; }
.foot a { color: var(--pink-deep); }