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18px;font-size:.78rem;font-weight:800}h1{letter-spacing:-.055em;max-width:700px;margin:0;font-size:clamp(2.85rem,5.2vw,5rem);line-height:.99}.hero-lead{max-width:600px;color:var(--muted);margin:28px 0 34px;font-size:clamp(1rem,1.6vw,1.16rem);line-height:1.7}.grade-picker{color:var(--muted);gap:11px;margin-bottom:23px;font-size:.82rem;font-weight:700;display:grid}.grade-options{flex-wrap:wrap;gap:8px;display:flex}.grade-button{border:1px solid var(--line);cursor:pointer;background:#ffffffb3;border-radius:12px;width:42px;height:42px;font-weight:800}.grade-button:focus-visible,.grade-button:hover{border-color:var(--violet)}.grade-button--selected{border-color:var(--violet);color:#fff;background:var(--violet);box-shadow:0 7px 18px #6457e53d}.primary-action{color:#fff;background:var(--violet);cursor:pointer;border:0;border-radius:17px;align-items:center;gap:28px;min-height:57px;padding:0 22px;font-weight:800;display:inline-flex;box-shadow:0 14px 30px 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p{color:var(--muted);margin-bottom:4px;font-size:.68rem}.subject-icon{border-radius:15px;place-items:center;width:47px;height:47px;display:grid}.step-badge,.subject-icon{color:var(--violet-dark);background:var(--violet-soft);font-weight:800}.step-badge{border-radius:999px;padding:7px 10px;font-size:.65rem}.message{grid-template-columns:auto 1fr;align-items:start;gap:12px;margin:30px 0 22px;display:grid}.message p{background:#f0eff8;border-radius:5px 19px 19px;margin:0;padding:15px 17px;font-size:.9rem;line-height:1.55}.avatar{border-radius:11px 11px 11px 4px;width:34px;height:34px;font-size:.78rem}.answer-field{border:1px solid var(--line);color:#9a97a7;background:#fff;border-radius:15px;margin-left:46px;padding:15px 16px;font-size:.82rem}.lesson-progress{background:#f4fbf8;border-radius:18px;margin-top:30px;padding:17px}.lesson-progress div:first-child{justify-content:space-between;gap:20px;font-size:.68rem;display:flex}.lesson-progress 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