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16px}.message-input{flex:1;border:none;background:transparent;font-size:15px;line-height:1.6;resize:none;outline:none;min-height:24px;max-height:150px;font-family:inherit;color:var(--text-primary)}.message-input::placeholder{color:var(--text-tertiary)}.send-btn{width:32px;height:32px;border:none;background:var(--primary);color:#fff;border-radius:var(--radius);cursor:pointer;display:flex;align-items:center;justify-content:center;font-size:14px;transition:all var(--transition);flex-shrink:0}.send-btn:hover:not(:disabled){background:var(--primary-dark);transform:scale(1.05)}.send-btn:disabled{background:var(--text-muted);cursor:not-allowed}.send-btn.stop-btn{background:#ef4444}.send-btn.stop-btn:hover{background:#dc2626;transform:scale(1.05)}.input-footer-hint{display:flex;justify-content:space-between;padding:8px 16px;font-size:12px;color:var(--text-tertiary);background:var(--bg-secondary)}.dropdown-menu{position:absolute;top:calc(100% + 8px);left:0;right:0;background:var(--bg-primary);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);padding:8px;z-index:200;opacity:0;visibility:hidden;transform:translateY(-10px);transition:all var(--transition)}.dropdown-menu.show{opacity:1;visibility:visible;transform:translateY(0)}.dropdown-item{display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:var(--radius);cursor:pointer;font-size:14px;color:var(--text-primary);transition:all var(--transition-fast)}.dropdown-item:hover{background:var(--bg-tertiary)}.dropdown-item i{font-size:16px;color:var(--text-tertiary)}.dropdown-item.logout,.dropdown-item.logout i{color:#ef4444}.dropdown-divider{height:1px;background:var(--border);margin:8px 0}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--text-muted);border-radius:3px}::-webkit-scrollbar-thumb:hover{background:var(--text-tertiary)}.bottom-nav{transition:transform .25s ease,opacity .25s ease}.bottom-nav.hidden{transform:translateY(100%);opacity:0;pointer-events:none}@media (max-width: 768px){.main-content.kb-open{padding-bottom:0!important}}@media (max-width: 768px){.chat-container::-webkit-scrollbar,.chat-scroll-wrapper::-webkit-scrollbar{display:none}.chat-container,.chat-scroll-wrapper{-ms-overflow-style:none;scrollbar-width:none}}.chat-scroll-wrapper{flex:1;overflow-y:auto;overflow-x:hidden;-webkit-overflow-scrolling:touch;position:relative;overscroll-behavior:contain}.chat-scroll-wrapper::-webkit-scrollbar{width:6px}.chat-scroll-wrapper::-webkit-scrollbar-track{background:transparent}.chat-scroll-wrapper::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}.chat-scroll-wrapper::-webkit-scrollbar-thumb:hover{background:var(--text-tertiary)}