:root{--primary:#2878b8;--primary-hover:#21699f;--brand:#e86452;--background:#f3f7fa;--surface:#ffffff;--surface-subtle:#f7fafc;--text:#16222d;--text-muted:#687783;--border:#dce5eb;--danger:#c83c37;--radius:16px;--shadow:0 10px 30px rgb(23 55 75/8%)}@media (prefers-color-scheme:dark){:root{--background:#111820;--surface:#18232d;--surface-subtle:#202d38;--text:#edf4f7;--text-muted:#9fb0bb;--border:#2e3d48;--primary:#5ba4da;--primary-hover:#74b5e3;--shadow:0 10px 30px rgb(0 0 0/22%)}}*{box-sizing:border-box}body,html{margin:0;min-height:100%}body{background:var(--background);color:var(--text);font-family:DM Sans,Inter,system-ui,-apple-system,sans-serif}button,input,select,textarea{font:inherit}a,button,select{-webkit-tap-highlight-color:transparent}button{color:inherit}.app-shell{display:grid;grid-template-columns:292px minmax(0,1fr);min-height:100vh}.sidebar{display:flex;flex-direction:column;gap:18px;padding:24px 18px 18px;background:var(--surface);border-right:1px solid var(--border)}.brand{display:flex;align-items:center;gap:11px;padding:0 6px 6px}.brand-mark,.welcome-icon{display:grid;place-items:center;color:white;background:linear-gradient(135deg,var(--primary),#55a2cf);box-shadow:0 8px 20px rgb(40 120 184/25%)}.brand-mark{width:38px;height:38px;border-radius:13px}.brand div{display:grid;gap:2px}.brand strong{font-size:17px}.brand span,.chat-header span{color:var(--text-muted);font-size:12px}.new-chat{display:flex;align-items:center;justify-content:center;gap:9px;min-height:44px;padding:0 16px;color:white;background:var(--primary);border:0;border-radius:13px;cursor:pointer}.new-chat:hover{background:var(--primary-hover)}.search-box{display:flex;align-items:center;gap:9px;min-height:42px;padding:0 12px;color:var(--text-muted);background:var(--surface-subtle);border:1px solid var(--border);border-radius:12px}.search-box input{width:100%;color:var(--text);background:transparent;border:0;outline:none}.chat-list{flex:1 1;min-height:0;display:flex;flex-direction:column;gap:5px;overflow-y:auto}.chat-list-note{padding:28px 12px;color:var(--text-muted);font-size:13px;text-align:center}.chat-list-item{display:flex;align-items:center;gap:3px;border-radius:11px}.chat-list-item.is-active,.chat-list-item:hover{background:var(--surface-subtle)}.chat-list-item>button{flex:1 1;min-width:0;padding:10px 8px 10px 11px;text-align:left;background:transparent;border:0;cursor:pointer}.chat-list-item>button span{display:block;overflow:hidden;font-size:13px;text-overflow:ellipsis;white-space:nowrap}.chat-list-actions{display:none;gap:1px;padding-right:4px}.chat-list-item.is-active .chat-list-actions,.chat-list-item:hover .chat-list-actions{display:flex}.chat-list-actions button{display:grid;place-items:center;width:28px;height:28px;color:var(--text-muted);background:transparent;border:0;border-radius:8px;cursor:pointer}.chat-list-actions button:hover{color:var(--text);background:var(--surface)}.sidebar-nav{display:grid;gap:4px}.sidebar-nav a,.sidebar-nav button{display:flex;align-items:center;gap:11px;min-height:42px;padding:0 12px;color:var(--text-muted);text-decoration:none;border-radius:11px}.sidebar-nav button{background:transparent;border:0;cursor:pointer}.sidebar-nav a:hover,.sidebar-nav button:hover{color:var(--text);background:var(--surface-subtle)}.chat{min-width:0;display:grid;grid-template-rows:auto minmax(0,1fr) auto;height:100vh}.chat-header{display:flex;align-items:center;gap:12px;min-height:72px;padding:0 28px;background:color-mix(in srgb,var(--surface) 88%,transparent);border-bottom:1px solid var(--border);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px)}.chat-header>div{display:grid;gap:3px}.mode-select{display:flex;align-items:center;gap:8px;margin-left:auto;color:var(--text-muted);font-size:12px}.mode-select select{padding:8px 30px 8px 10px;color:var(--text);background:var(--surface-subtle);border:1px solid var(--border);border-radius:10px}.messages{min-height:0;overflow-y:auto;padding:32px max(24px,calc((100% - 820px) / 2))}.welcome{max-width:680px;margin:clamp(44px,12vh,120px) auto 0;text-align:center}.welcome-icon{width:48px;height:48px;margin:0 auto 18px;border-radius:17px}.welcome h1{margin:0 0 10px;font-size:clamp(28px,4vw,38px);letter-spacing:-.03em}.welcome>p{max-width:530px;margin:0 auto;color:var(--text-muted);line-height:1.6}.starter-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin-top:30px}.starter-grid button{min-height:54px;padding:12px 15px;text-align:left;background:var(--surface);border:1px solid var(--border);border-radius:14px;cursor:pointer;box-shadow:0 4px 14px rgb(23 55 75/3%)}.starter-grid button:hover{border-color:color-mix(in srgb,var(--primary) 48%,var(--border));transform:translateY(-1px)}.message{max-width:820px;margin:0 auto 24px}.message-role{display:block;margin-bottom:7px;color:var(--text-muted);font-size:12px;font-weight:600}.message>div{line-height:1.65}.message-user{width:fit-content;max-width:min(680px,88%);margin-right:0;padding:13px 16px;background:color-mix(in srgb,var(--primary) 12%,var(--surface));border-radius:16px 16px 4px 16px}.message p{margin:0;white-space:pre-wrap}.error-banner{max-width:820px;margin:16px auto;padding:12px 14px;color:var(--danger);background:color-mix(in srgb,var(--danger) 8%,var(--surface));border:1px solid color-mix(in srgb,var(--danger) 28%,var(--border));border-radius:12px}.composer-wrap{padding:12px max(24px,calc((100% - 820px) / 2)) 18px;background:linear-gradient(transparent,var(--background) 24%)}.composer{padding:12px;background:var(--surface);border:1px solid var(--border);border-radius:20px;box-shadow:var(--shadow)}.composer:focus-within{border-color:color-mix(in srgb,var(--primary) 55%,var(--border))}.composer textarea{display:block;width:100%;min-height:46px;max-height:180px;padding:4px 5px 10px;resize:none;color:var(--text);background:transparent;border:0;outline:none}.composer-actions{display:flex;align-items:center;justify-content:space-between}.composer-actions>div{display:flex;gap:4px}.icon-button,.send-button{display:inline-grid;place-items:center;width:38px;height:38px;border:0;border-radius:11px;cursor:pointer}.icon-button{color:var(--text-muted);background:transparent}.icon-button:hover{color:var(--text);background:var(--surface-subtle)}.send-button{color:white;background:var(--primary)}.send-button:disabled{cursor:default;opacity:.45}.disclaimer{margin:8px 0 0;color:var(--text-muted);font-size:11px;text-align:center}.mobile-only,.sidebar-backdrop,.sidebar-close{display:none}@media (max-width:760px){.app-shell{display:block}.sidebar{position:fixed;z-index:30;inset:0 auto 0 0;display:flex;width:min(88vw,320px);transform:translateX(-105%);transition:transform .18s ease;box-shadow:16px 0 44px rgb(0 0 0/18%)}.sidebar.sidebar-open{transform:translateX(0)}.sidebar-close{display:inline-grid;margin-left:auto}.sidebar-backdrop{position:fixed;z-index:20;inset:0;display:block;background:rgb(10 20 28/42%);border:0}.chat-header{min-height:62px;padding:0 14px}.mobile-only{display:inline-grid}.mode-select>span{display:none}.mode-select select{max-width:145px}.messages{padding:22px 14px}.welcome{margin-top:54px}.starter-grid{grid-template-columns:1fr}.composer-wrap{padding:10px 10px 12px}}.login-page{min-height:100vh;display:grid;place-items:center;padding:24px}.login-card{width:min(100%,420px);padding:34px;text-align:center;background:var(--surface);border:1px solid var(--border);border-radius:22px;box-shadow:var(--shadow)}.login-card h1{margin:18px 0 8px;font-size:26px}.login-card>p{margin:0;color:var(--text-muted);line-height:1.55}.login-form{display:grid;gap:14px;margin-top:26px;text-align:left}.login-form label{display:grid;gap:7px;color:var(--text-muted);font-size:13px;font-weight:600}.login-form input{min-height:46px;padding:0 13px;color:var(--text);background:var(--surface-subtle);border:1px solid var(--border);border-radius:12px;outline:none}.login-form input:focus{border-color:var(--primary)}.login-form button{min-height:46px;color:white;background:var(--primary);border:0;border-radius:12px;cursor:pointer}.login-form button:disabled{cursor:default;opacity:.5}.login-form .text-button{min-height:auto;padding:5px;color:var(--primary);background:transparent}.form-message{margin:0;color:var(--text-muted);font-size:13px;text-align:center}