:root{--bg-primary:#0f172a;--bg-secondary:#1e293b;--text-primary:#f8fafc;--text-secondary:#94a3b8;--accent-primary:#3b82f6;--accent-secondary:#2563eb;--user-msg-bg-start:#2563eb;--user-msg-bg-end:#1d4ed8;--assistant-msg-bg:#334155;--input-bg:#1e293b;--border-color:#334155;--danger:#ef4444}*{box-sizing:border-box;padding:0;margin:0}body,html{max-width:100vw;overflow-x:hidden;background-color:var(--bg-primary);color:var(--text-primary);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;height:100%}a{color:inherit;text-decoration:none}.container{display:flex;flex-direction:column;height:100dvh;max-width:800px;margin:0 auto;position:relative}.header{justify-content:space-between;padding:1rem 1.5rem;background-color:var(--bg-primary);border-bottom:1px solid var(--border-color);position:-webkit-sticky;position:sticky;top:0;z-index:10}.header,.header-left{display:flex;align-items:center}.header-left{gap:.75rem}.header-logo{height:36px;width:auto;object-fit:contain}.title{font-size:1.5rem;font-weight:700;background:linear-gradient(90deg,#60a5fa,#3b82f6);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;margin:0}.clear-btn{background-color:hsla(0,0%,100%,.05);border:1px solid var(--border-color);color:var(--text-secondary);padding:.5rem 1rem;border-radius:8px;font-size:.875rem;cursor:pointer;transition:all .2s ease;display:flex;align-items:center;gap:.5rem}.clear-btn:hover{background-color:hsla(0,0%,100%,.1);color:var(--text-primary);border-color:var(--danger)}.clear-icon{width:16px;height:16px;fill:currentColor}.chat-area{flex:1 1;overflow-y:auto;padding:1.5rem;display:flex;flex-direction:column;gap:1.5rem}.empty-state{flex:1 1;display:flex;align-items:center;justify-content:center;color:var(--text-secondary);font-size:1.1rem;text-align:center;padding:2rem;opacity:.6}.message-wrapper{display:flex;flex-direction:column;max-width:85%}.message-wrapper.user{align-self:flex-end;align-items:flex-end}.message-wrapper.assistant{align-self:flex-start;align-items:flex-start}.message-bubble{padding:1rem 1.25rem;border-radius:1.25rem;font-size:1rem;line-height:1.6;position:relative;word-wrap:break-word;overflow-wrap:break-word}.message-bubble.user{background:linear-gradient(135deg,var(--user-msg-bg-start),var(--user-msg-bg-end));color:#fff;border-bottom-right-radius:.25rem;box-shadow:0 4px 6px -1px rgba(0,0,0,.1),0 2px 4px -1px rgba(0,0,0,.06)}.message-bubble.assistant{background-color:var(--assistant-msg-bg);color:var(--text-primary);border-bottom-left-radius:.25rem;border:1px solid hsla(0,0%,100%,.05)}.input-area-wrapper{padding:1.5rem;background:linear-gradient(to top,var(--bg-primary) 80%,transparent);position:-webkit-sticky;position:sticky;bottom:0;z-index:20}.input-container{display:flex;gap:.75rem;background-color:var(--input-bg);padding:.5rem;border-radius:1.5rem;border:1px solid var(--border-color);box-shadow:0 10px 15px -3px rgba(0,0,0,.1);transition:border-color .2s ease;align-items:center}.input-container:focus-within{border-color:var(--accent-primary)}.chat-input{flex:1 1;background:transparent;border:none;color:var(--text-primary);padding:.75rem 1rem;font-size:1rem;outline:none;min-height:24px}.chat-input::placeholder{color:var(--text-secondary)}.send-btn{background-color:var(--accent-primary);color:#fff;border:none;border-radius:50%;width:42px;height:42px;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background-color .2s ease;flex-shrink:0}.send-btn:hover:not(:disabled){background-color:var(--accent-secondary)}.send-btn:disabled{opacity:.5;cursor:not-allowed;background-color:var(--bg-secondary)}.send-icon{width:20px;height:20px;fill:currentColor;transform:translateX(2px)}@media (max-width:640px){.header{padding:.75rem 1rem}.chat-area{padding:1rem;gap:1rem}.message-bubble{padding:.875rem 1rem;font-size:.95rem}.message-wrapper{max-width:90%}.input-area-wrapper{padding:1rem}}