:root{--bg: #0a0a0a;--bg-surface: #171717;--bg-hover: #262626;--bg-input: #1a1a1a;--border: #2a2a2a;--text: #e5e5e5;--text-muted: #a3a3a3;--text-dim: #737373;--accent: #3b82f6;--accent-hover: #2563eb;--accent-dim: #1e3a5f;--danger: #ef4444;--success: #22c55e;--radius: 12px;--radius-sm: 8px;--max-width: 480px;--safe-top: env(safe-area-inset-top, 0px);--safe-bottom: env(safe-area-inset-bottom, 0px)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{min-height:100dvh;overflow-x:hidden}#root{display:flex;flex-direction:column;min-height:100dvh;max-width:var(--max-width);margin:0 auto}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}button{font-family:inherit;cursor:pointer;border:none;outline:none}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 20px;border-radius:var(--radius-sm);font-size:15px;font-weight:500;transition:background .15s,opacity .15s}.btn-primary{background:var(--accent);color:#fff}.btn-primary:hover{background:var(--accent-hover)}.btn-primary:disabled{opacity:.5;cursor:not-allowed}.btn-ghost{background:transparent;color:var(--text-muted)}.btn-ghost:hover{background:var(--bg-hover);color:var(--text)}.btn-danger{background:transparent;color:var(--danger)}.btn-danger:hover{background:#ef44441a}input,textarea{font-family:inherit;font-size:16px;background:var(--bg-input);color:var(--text);border:1px solid var(--border);border-radius:var(--radius-sm);padding:12px 14px;width:100%;outline:none;transition:border-color .15s}input:focus,textarea:focus{border-color:var(--accent)}input::placeholder,textarea::placeholder{color:var(--text-dim)}.card{background:var(--bg-surface);border:1px solid var(--border);border-radius:var(--radius);padding:16px}.page{flex:1;display:flex;flex-direction:column;padding:var(--safe-top) 16px var(--safe-bottom)}.page-header{display:flex;align-items:center;justify-content:space-between;padding:16px 0}.page-header h1{font-size:20px;font-weight:600}.login-page{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:24px;gap:24px}.login-page h1{font-size:24px;font-weight:700}.login-form{display:flex;flex-direction:column;gap:12px;width:100%;max-width:360px}.login-form .error{color:var(--danger);font-size:14px}.login-toggle{font-size:14px;color:var(--text-muted)}.chat-list{display:flex;flex-direction:column;gap:8px;padding-bottom:80px}.chat-item{display:flex;align-items:center;justify-content:space-between;padding:14px 16px;background:var(--bg-surface);border:1px solid var(--border);border-radius:var(--radius-sm);cursor:pointer;transition:background .15s}.chat-item:hover{background:var(--bg-hover)}.chat-item-title{font-weight:500;font-size:15px}.chat-item-meta{font-size:13px;color:var(--text-dim)}.chat-item-actions{display:flex;gap:4px}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;flex:1;gap:12px;color:var(--text-dim);font-size:15px;padding:48px 0}.fab{position:fixed;bottom:calc(24px + var(--safe-bottom));right:24px;width:56px;height:56px;border-radius:50%;background:var(--accent);color:#fff;font-size:28px;display:flex;align-items:center;justify-content:center;box-shadow:0 4px 12px #0006;transition:background .15s,transform .15s}.fab:hover{background:var(--accent-hover);transform:scale(1.05)}.chat-view{flex:1;display:flex;flex-direction:column;height:100dvh}.chat-messages{flex:1;overflow-y:auto;padding:16px;display:flex;flex-direction:column;gap:12px}.message-bubble{max-width:85%;padding:10px 14px;border-radius:var(--radius);font-size:15px;line-height:1.5;word-break:break-word;white-space:pre-wrap}.message-user{align-self:flex-end;background:var(--accent-dim);border:1px solid var(--accent);color:var(--text)}.message-assistant{align-self:flex-start;background:var(--bg-surface);border:1px solid var(--border);color:var(--text)}.message-system{align-self:center;background:transparent;color:var(--text-dim);font-size:13px;font-style:italic}.chat-input-bar{display:flex;gap:8px;padding:12px 16px calc(12px + var(--safe-bottom));border-top:1px solid var(--border);background:var(--bg)}.chat-input-bar textarea{flex:1;resize:none;min-height:44px;max-height:120px;padding:10px 14px;border-radius:22px}.chat-input-bar button{width:44px;height:44px;border-radius:50%;background:var(--accent);color:#fff;font-size:20px;flex-shrink:0}.chat-input-bar button:disabled{opacity:.4}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}.loading{display:flex;align-items:center;justify-content:center;padding:48px;color:var(--text-dim)}.error-banner{background:#ef44441a;border:1px solid var(--danger);color:var(--danger);padding:10px 14px;border-radius:var(--radius-sm);font-size:14px;margin-bottom:12px}.back-btn{font-size:14px;color:var(--text-muted);padding:4px 0}