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var(--line);border-radius:var(--radius);background:var(--surface);box-shadow:var(--shadow-card);overflow:hidden}.tutor-scroll{flex:1 1;overflow-y:auto;padding:22px;display:flex;flex-direction:column;gap:16px}.tutor-empty{margin:auto;text-align:center;max-width:44ch;color:var(--ink-soft)}.tutor-empty-icon{font-size:2.4rem}.suggestions{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin-top:16px}.bubble-row{display:flex}.bubble-row.user{justify-content:flex-end}.bubble{max-width:82%;padding:13px 17px;border-radius:16px;font-size:var(--text-base)}.bubble.user{background:linear-gradient(135deg,var(--crimson),var(--crimson-bright));color:#fff;border-bottom-right-radius:5px}.bubble.assistant{background:var(--surface-2);border:1px solid var(--line);border-bottom-left-radius:5px}.thinking{color:var(--ink-faint);animation:pulse 1.2s ease-in-out infinite}@keyframes pulse{50%{opacity:.45}}.sources{margin-top:10px;padding-top:8px;border-top:1px dashed var(--line-strong);display:flex;flex-wrap:wrap;gap:6px;align-items:center;font-size:var(--text-xs)}.src-chip{padding:2px 9px;border-radius:999px;background:var(--crimson-soft);color:var(--crimson);font-weight:600}.composer{display:flex;gap:10px;padding:14px;border-top:1px solid var(--line);background:var(--surface)}.composer input{flex:1 1;padding:12px 16px;border:1.5px solid var(--line-strong);border-radius:999px;font:inherit;background:var(--bg)}.composer input:focus{outline:none;border-color:var(--crimson)}@media (max-width:560px){.setup-row{grid-template-columns:1fr}.bubble{max-width:92%}}