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.15s}.subject-btn:hover,.subject-btn.active{border-color:#4f46e573;background:#4f46e514;color:var(--accent)}.subject-btn[data-subj=Science].active{background:#ffe4ef;color:#9d174d;border-color:#f9a8d4}.subject-btn[data-subj=Technology].active{background:#dbeafe;color:#1e3a8a;border-color:#93c5fd}.subject-btn[data-subj=Engineering].active{background:#d1fae5;color:#064e3b;border-color:#6ee7b7}.subject-btn[data-subj=Mathematics].active{background:#fef3c7;color:#78350f;border-color:#fcd34d}.suggestions{display:flex;flex-wrap:wrap;gap:7px}.suggestion-chip{font-size:12px;font-weight:700;padding:6px 14px;border-radius:99px;border:1.5px solid var(--border2);background:var(--surface);color:var(--text-muted);cursor:pointer;transition:all .15s;white-space:nowrap}.suggestion-chip:hover{background:#4f46e512;border-color:#4f46e54d;color:var(--accent)}.chat-window{background:var(--surface);border:1.5px solid 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.15s}.chat-clear-btn:hover{color:var(--accent);border-color:#4f46e559}.chat-messages{flex:1;padding:20px;overflow-y:auto;display:flex;flex-direction:column;gap:16px;min-height:360px;max-height:520px}.msg{display:flex;gap:10px;align-items:flex-start}.msg.user{flex-direction:row-reverse}.msg-avatar{width:32px;height:32px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:15px;flex-shrink:0;margin-top:2px}.msg.ai .msg-avatar{background:linear-gradient(135deg,#6366f1,#a855f7)}.msg.user .msg-avatar{background:var(--surface3);font-size:16px}.msg-bubble{max-width:78%;padding:12px 16px;border-radius:16px;font-size:14px;line-height:1.65;font-weight:600}.msg.ai .msg-bubble{background:var(--surface2);border:1.5px solid var(--border);border-top-left-radius:4px;color:var(--text)}.msg.user .msg-bubble{background:var(--accent);color:#fff;border-top-right-radius:4px}.msg-time{font-size:10px;color:var(--text-dim);font-family:var(--font-mono);margin-top:4px;display:block;text-align:right}.msg.ai .msg-time{text-align:left}.typing-indicator{display:none}.typing-indicator.visible{display:flex}.typing-dots{display:flex;gap:4px;align-items:center;padding:8px 4px}.typing-dots span{width:7px;height:7px;border-radius:50%;background:var(--text-dim);animation:bounce .8s infinite}.typing-dots span:nth-child(2){animation-delay:.16s}.typing-dots span:nth-child(3){animation-delay:.32s}@keyframes bounce{0%,80%,to{transform:translateY(0);opacity:.5}40%{transform:translateY(-5px);opacity:1}}.msg-error .msg-bubble{background:#fff1f2;border-color:#fecdd3;color:#be123c}.msg.ai .msg-bubble strong{color:var(--accent)}.msg.ai .msg-bubble .katex-display{overflow-x:auto;overflow-y:hidden}.msg.ai .msg-bubble .katex{font-size:1em}.chat-input-row{display:flex;gap:10px;align-items:flex-end;padding:14px 16px;border-top:1px solid var(--border);background:var(--surface2)}.chat-input{flex:1;resize:none;min-height:44px;max-height:120px;font-family:var(--font-sans);font-size:14px;font-weight:600;padding:11px 14px;border-radius:12px;border:1.5px solid var(--border2);background:var(--surface);color:var(--text);outline:none;transition:border-color .15s;line-height:1.5}.chat-input:focus{border-color:#4f46e580}.chat-input::placeholder{color:var(--text-dim);font-weight:500}.chat-send-btn{width:44px;height:44px;border-radius:12px;flex-shrink:0;background:var(--accent);color:#fff;border:none;font-size:18px;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background .15s,transform .1s}.chat-send-btn:hover:not(:disabled){background:#4338ca;transform:scale(1.05)}.chat-send-btn:disabled{background:var(--surface3);color:var(--text-dim);cursor:not-allowed;transform:none}.chat-footer-info{display:flex;justify-content:flex-end;padding:0 16px 10px;font-size:10px;font-family:var(--font-mono);color:var(--text-dim)}.info-cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:12px;margin-top:8px}.info-card{background:var(--surface);border:1.5px solid var(--border2);border-radius:16px;padding:18px 20px;box-shadow:var(--shadow-sm)}.info-card-icon{font-size:26px;margin-bottom:8px}.info-card-title{font-size:13px;font-weight:800;margin-bottom:5px}.info-card-desc{font-size:12px;color:var(--text-muted);font-weight:600;line-height:1.55}@media (max-width: 600px){.tutor-wrap{padding:24px 14px 48px}.tutor-hero h1{font-size:24px}.chat-messages{min-height:280px;max-height:400px}.msg-bubble{max-width:90%;font-size:13px}.suggestion-chip{font-size:11px}.info-cards{grid-template-columns:1fr}}