:root{--bg:#f8fafc;--panel:#fff;--ink:#172033;--muted:#64748b;--line:#e2e8f0;--brand:#2563eb;--brand-dark:#1d4ed8;--good:#16a34a;--warn:#f59e0b;--bad:#dc2626;--shadow:0 20px 60px rgba(15,23,42,.08)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:radial-gradient(circle at top left,#dbeafe 0,transparent 32rem),var(--bg);color:var(--ink);font-family:ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}a{color:inherit;text-decoration:none}button,input,select,textarea{font:inherit}.page{width:min(1120px,calc(100% - 32px));margin:0 auto;padding:24px 0 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var(--line);border-radius:20px}table{width:100%;border-collapse:collapse;background:#fff}td,th{padding:12px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}th{color:#475569;background:#f8fafc;font-size:13px}.robot-grid{display:grid;grid-gap:8px;gap:8px;width:min(360px,100%)}.robot-cell{aspect-ratio:1;display:grid;place-items:center;background:#fff;border:1px solid var(--line);border-radius:16px;font-size:28px}.answer-box{min-height:52px;border:1px dashed #94a3b8;border-radius:18px;padding:12px;background:#f8fafc;display:flex;gap:8px;flex-wrap:wrap}.footer-note{margin-top:40px;color:var(--muted);font-size:14px}@media (max-width:820px){.grid-2,.grid-3,.grid-4,.hero{grid-template-columns:1fr}.nav{align-items:flex-start;flex-direction:column}}@media print{.actions,.nav,.no-print{display:none!important}body{background:#fff}.page{width:100%;padding:0}.card{box-shadow:none;border-color:#ccc}}.lesson-card.locked{opacity:.62}.lesson-card.locked 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