:root{--bg: #fbfbfa;--surface: #ffffff;--sidebar: #f4f4f2;--ink: #1b1b19;--ink-soft: #55534e;--ink-faint: #8a8780;--line: #e3e2de;--accent: #1f5f4f;--accent-ink: #ffffff;--danger: #9b2c22;--radius: 10px;--sidebar-width: 268px;color-scheme:light dark;font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;font-size:15px;line-height:1.55}@media (prefers-color-scheme: dark){:root{--bg: #16171a;--surface: #1c1e21;--sidebar: #131416;--ink: #ececea;--ink-soft: #b3b1ab;--ink-faint: #7e7c76;--line: #2b2d31;--accent: #4bbf9c;--accent-ink: #0d1412;--danger: #e2867c}}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);-webkit-font-smoothing:antialiased}.muted{color:var(--ink-soft)}.small{font-size:.875rem}.button{font:inherit;border:1px solid transparent;border-radius:var(--radius);padding:.55rem .9rem;cursor:pointer;transition:background-color .12s ease,border-color .12s ease,opacity .12s ease}.button:disabled{opacity:.5;cursor:not-allowed}.button.primary{background:var(--accent);color:var(--accent-ink)}.button.primary:hover:not(:disabled){filter:brightness(1.08)}.button.ghost{background:transparent;color:var(--ink-soft);border-color:var(--line)}.button.ghost:hover:not(:disabled){background:var(--surface);color:var(--ink)}.button.small{padding:.3rem .6rem;font-size:.875rem}:focus-visible{outline:2px solid var(--accent);outline-offset:2px}input,textarea{font:inherit;color:var(--ink);background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:.55rem .7rem;width:100%}input:disabled,textarea:disabled{opacity:.6}.splash{min-height:100vh;display:grid;place-items:center}.splash-mark{font-weight:600;letter-spacing:.14em;color:var(--ink-faint)}.signin{min-height:100vh;display:grid;place-items:center;padding:1.5rem}.signin-card{width:100%;max-width:23rem;background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:2rem;display:grid;gap:1rem}.signin-title{margin:0;font-size:1.3rem;font-weight:600;letter-spacing:-.01em}.signin-lede{margin:-.5rem 0 .5rem;color:var(--ink-soft);font-size:.925rem}.field{display:grid;gap:.35rem}.field-label{font-size:.875rem;color:var(--ink-soft)}.form-error{margin:0;min-height:1.25rem;font-size:.875rem;color:var(--danger)}.app{min-height:100vh;display:grid;grid-template-columns:var(--sidebar-width) 1fr}.sidebar{background:var(--sidebar);border-right:1px solid var(--line);display:grid;grid-template-rows:auto 1fr auto;min-height:100vh;min-width:0}.sidebar-head{padding:1rem;display:grid;gap:.75rem}.brand{font-weight:600;letter-spacing:.12em;font-size:.8rem;color:var(--ink-faint)}.button.new{width:100%;text-align:left}.project-list{padding:0 .5rem;overflow-y:auto;display:grid;align-content:start;gap:2px}.project{font:inherit;text-align:left;background:transparent;border:0;border-radius:8px;padding:.5rem .6rem;color:var(--ink-soft);cursor:pointer;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.project:hover{background:var(--surface);color:var(--ink)}.project.active{background:var(--surface);color:var(--ink);font-weight:500}.new-project input{margin-bottom:2px}.project-list p{padding:.5rem .6rem;margin:0}.sidebar-foot{padding:.85rem 1rem;border-top:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:.5rem;min-width:0}.who{font-size:.875rem;color:var(--ink-soft);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.main{display:grid;grid-template-rows:auto 1fr auto;min-height:100vh;min-width:0}.main-head{padding:1.1rem 1.75rem;border-bottom:1px solid var(--line)}.main-head h1{margin:0;font-size:1.05rem;font-weight:600}.conversation{padding:1.75rem;overflow-y:auto;min-height:0}.composer{padding:1rem 1.75rem 1.5rem;border-top:1px solid var(--line)}.composer textarea{resize:none;max-height:12rem}.composer-form{display:flex;gap:.6rem;align-items:flex-end}.composer-form textarea{flex:1}.composer-form .button{white-space:nowrap}.thread{display:grid;gap:.9rem;max-width:46rem}.message{display:grid}.message.user{justify-items:end}.bubble{max-width:100%;padding:.7rem .9rem;border-radius:12px;background:var(--surface);border:1px solid var(--line);white-space:pre-wrap;word-break:break-word}.message.user .bubble{background:var(--accent);color:var(--accent-ink);border-color:transparent}.bubble.streaming{min-width:2.5rem;min-height:1.4rem;display:flex;align-items:center}.caret{width:.5rem;height:.5rem;border-radius:50%;background:var(--accent);animation:pulse 1s ease-in-out infinite}@keyframes pulse{0%,to{opacity:.25}50%{opacity:1}}.tools{margin-top:1rem;display:flex;flex-wrap:wrap;gap:.5rem}.tool{display:inline-flex;align-items:center;gap:.45rem;font-size:.8rem;color:var(--ink-soft);background:var(--surface);border:1px solid var(--line);border-radius:999px;padding:.25rem .7rem}.spinner{width:.7rem;height:.7rem;border-radius:50%;border:2px solid var(--line);border-top-color:var(--accent);animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.empty{color:var(--ink-soft)}.empty.centered{display:grid;place-content:center;justify-items:center;gap:.5rem;text-align:center;grid-row:1 / -1;padding:2rem}.empty.centered h2{margin:0;font-size:1.15rem;color:var(--ink)}.empty.centered p{margin:0}.empty.centered .button{margin-top:.75rem}.banner{margin:1rem 1.75rem 0;padding:.6rem .8rem;border-radius:var(--radius);font-size:.9rem}.banner.error{background:color-mix(in srgb,var(--danger) 12%,transparent);color:var(--danger)}@media (max-width: 720px){.app{grid-template-columns:1fr;grid-template-rows:auto 1fr}.sidebar{min-height:0;grid-template-rows:auto auto auto;border-right:0;border-bottom:1px solid var(--line)}.project-list{max-height:9rem}.main{min-height:0}.main-head,.conversation,.composer{padding-left:1rem;padding-right:1rem}.banner{margin-inline:1rem}}