:root {
  color-scheme: dark;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #08111f;
  color: #eef5ff;
}

* { box-sizing: border-box; }
body { margin: 0; background: radial-gradient(circle at 20% 0%, #17345c 0, #08111f 38rem); }
main { width: min(1120px, calc(100% - 32px)); margin: 0 auto; }

.hero {
  display: grid;
  grid-template-columns: 1.5fr 0.8fr;
  gap: 48px;
  align-items: end;
  min-height: 520px;
  padding: 72px 0 56px;
}

.eyebrow { margin: 0 0 10px; color: #67e8f9; font-size: 12px; font-weight: 800; letter-spacing: .15em; text-transform: uppercase; }
h1, h2, h3, p { margin-top: 0; }
h1 { margin-bottom: 22px; font-size: clamp(46px, 8vw, 92px); line-height: .94; letter-spacing: -.055em; }
h1 span { color: #fbbf24; }
.lead { max-width: 680px; color: #bed0e6; font-size: clamp(18px, 2.4vw, 25px); line-height: 1.5; }

.proof { display: grid; gap: 12px; }
.proof div { padding: 18px 20px; border: 1px solid #2b4566; border-radius: 18px; background: rgb(12 29 51 / 80%); }
.proof strong, .proof span { display: block; }
.proof strong { color: #fff; font-size: 20px; }
.proof span { margin-top: 4px; color: #8fa9c7; }

.lab { padding: 32px; border: 1px solid #2b4566; border-radius: 28px; background: rgb(8 20 37 / 92%); box-shadow: 0 35px 90px rgb(0 0 0 / 35%); }
.lab-head, .actions, footer { display: flex; justify-content: space-between; gap: 20px; align-items: center; }
h2 { margin-bottom: 14px; font-size: clamp(30px, 4vw, 48px); letter-spacing: -.035em; }
label { display: block; margin: 18px 0 8px; color: #9eb5cf; font-size: 13px; font-weight: 700; }
textarea { width: 100%; resize: vertical; padding: 18px; border: 1px solid #385777; border-radius: 16px; outline: none; background: #0d1b2e; color: #eef5ff; font: 17px/1.6 Georgia, serif; }
textarea:focus { border-color: #67e8f9; box-shadow: 0 0 0 3px rgb(103 232 249 / 12%); }

button { padding: 10px 14px; border: 1px solid #385777; border-radius: 12px; background: #132842; color: #eaf3ff; cursor: pointer; font: inherit; font-weight: 750; }
button:hover { border-color: #67e8f9; }
button.primary { padding: 13px 20px; border-color: #fbbf24; background: #fbbf24; color: #111827; }
.sample-buttons { display: flex; gap: 8px; }
#summary { color: #9eb5cf; font-size: 13px; }
.actions { margin: 14px 0 26px; }

.result-grid { display: grid; grid-template-columns: minmax(0, 1.4fr) minmax(260px, .6fr); gap: 18px; }
.result, .explanation { min-height: 220px; padding: 22px; border-radius: 18px; }
.result { background: #f7f3e8; color: #162235; font: 19px/1.8 Georgia, serif; white-space: pre-wrap; }
.explanation { border: 1px solid #304c6b; background: #0d1b2e; }
.explanation h3 { font-size: 23px; }
.explanation p { color: #b7c9dd; line-height: 1.55; }
.explanation .question { color: #fbbf24; font-weight: 700; }

.cm-mark { padding: 1px 2px; border: 0; border-bottom: 3px solid #f59e0b; border-radius: 2px; background: #fef3c7; color: inherit; cursor: help; font: inherit; }
.cm-mark[data-category="emotion"] { border-color: #ef4444; background: #fee2e2; }
.cm-mark[data-category="logic"] { border-color: #8b5cf6; background: #ede9fe; }
.cm-mark[data-category="evidence"] { border-color: #0ea5e9; background: #e0f2fe; }
.cm-mark[data-category="source"] { border-color: #10b981; background: #d1fae5; }
.cm-mark:focus { outline: 3px solid rgb(14 165 233 / 35%); }

.capabilities { padding: 92px 0 72px; }
.cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.cards article { padding: 22px; border: 1px solid #2b4566; border-radius: 18px; background: #0d1b2e; }
.cards strong { color: #fbbf24; font-size: 18px; }
.cards p { margin: 10px 0 0; color: #9eb5cf; line-height: 1.5; }

footer { padding: 28px 0 46px; border-top: 1px solid #213b5a; color: #8fa9c7; }
footer p { margin: 0; }
footer a { color: #67e8f9; }

@media (max-width: 820px) {
  .hero, .result-grid { grid-template-columns: 1fr; }
  .hero { min-height: auto; padding-top: 48px; }
  .cards { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 560px) {
  main { width: min(100% - 20px, 1120px); }
  .hero { gap: 24px; }
  .lab { padding: 18px; }
  .lab-head, .actions, footer { align-items: flex-start; flex-direction: column; }
  .sample-buttons { width: 100%; }
  .sample-buttons button { flex: 1; }
  .cards { grid-template-columns: 1fr; }
}