:root{color-scheme:light;--bg: #eef0f7;--panel: #fbfbff;--ink: #1f2433;--muted: #61697f;--line: #c8cede;--accent: #2457b8;--accent-2: #183d80}*{box-sizing:border-box}body{margin:0;background:radial-gradient(circle at 20% 10%,rgba(36,87,184,.15),transparent 28%),radial-gradient(circle at 78% 18%,rgba(85,129,214,.16),transparent 30%),linear-gradient(180deg,#f5f6fb 0%,var(--bg) 100%);color:var(--ink);font-family:IBM Plex Sans,Avenir Next,sans-serif}#root{min-height:100vh;display:grid;place-items:center;padding:24px}.flashcards-shell{width:min(860px,100%);background:color-mix(in srgb,var(--panel) 95%,white);border:1px solid var(--line);border-radius:24px;box-shadow:0 18px 44px #1f24331f;padding:22px}.flashcards-header h1{margin:0;font-size:clamp(1.8rem,1.3rem + 1.1vw,2.4rem);letter-spacing:-.05em}.eyebrow{margin:0 0 6px;color:var(--accent);font-size:.82rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase}.subtitle{margin:8px 0 0;color:var(--muted);max-width:62ch}button{border:1px solid var(--line);border-radius:12px;background:#fff;color:var(--ink);cursor:pointer;font:inherit}.topic-strip{display:flex;gap:10px;flex-wrap:wrap;margin:20px 0 16px}.topic-chip{padding:8px 12px;font-weight:700}.topic-chip[data-active=true]{background:var(--accent);border-color:var(--accent);color:#fff}.deck-meta{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:14px}.pill{border:1px solid var(--line);border-radius:999px;background:#fff;padding:8px 12px;font-weight:600}.pill.muted{color:var(--muted)}.flashcard{border:1px solid var(--line);border-radius:20px;background:linear-gradient(135deg,rgba(36,87,184,.08),transparent 40%),linear-gradient(180deg,#fffefe,#f7f8fc);padding:26px;min-height:360px}.flashcard.empty{min-height:180px}.card-label{margin:0 0 10px;color:var(--accent);font-weight:700;letter-spacing:.06em;text-transform:uppercase;font-size:.82rem}.flashcard h2{margin:0;font-size:clamp(1.4rem,1.15rem + .8vw,2rem);line-height:1.2}.hint{margin:20px 0 0;color:var(--muted)}.answer-block{margin-top:22px;display:grid;gap:16px}.answer-block p{margin:0;line-height:1.6}.reference-list{display:grid;gap:10px}.reference-link{display:flex;gap:10px;align-items:center;border:1px solid var(--line);border-radius:14px;background:#fff;color:inherit;padding:12px 14px;text-decoration:none}.reference-link:hover{border-color:var(--accent)}.kind-badge{min-width:72px;border-radius:999px;background:#edf2ff;color:var(--accent-2);padding:5px 9px;font-size:.78rem;font-weight:700;text-transform:uppercase;text-align:center}.deck-controls{display:flex;gap:10px;justify-content:space-between;margin-top:16px}.deck-controls button{min-width:140px;padding:10px 14px;font-weight:700}.deck-controls .primary{background:var(--accent);border-color:var(--accent);color:#fff}.flashcards-banner{margin:14px 0 0;padding:12px 14px;border:1px solid var(--line);border-radius:14px;background:#fff}.flashcards-banner.error{color:#a4322c;background:#fff4f1}@media(max-width:640px){.flashcards-shell{padding:18px}.deck-controls{flex-direction:column}.deck-controls button{width:100%}}