:root,[data-theme=light]{color-scheme:light;--bg:#f8fafd;--surface:#ffffff;--nav:#eef3fb;--ink:#1f1f1f;--muted:#444746;--line:#e1e3e1;--accent:#0b57d0;--accent-ink:#ffffff;--sent:#0b57d0;--sent-ink:#ffffff;--received:#f1f3f4;--received-ink:#1f1f1f;--danger:#b3261e;--shadow:0 1px 2px rgba(0,0,0,0.08),0 4px 16px rgba(0,0,0,0.06);--hover:rgba(11,87,208,0.08);--active:#d3e3fd}[data-theme=dark]{color-scheme:dark;--bg:#1f1f1f;--surface:#131314;--nav:#1b1b1b;--ink:#e3e3e3;--muted:#c4c7c5;--line:#444746;--accent:#a8c7fa;--accent-ink:#062e6f;--sent:#a8c7fa;--sent-ink:#062e6f;--received:#2d2f31;--received-ink:#e3e3e3;--danger:#f2b8b5;--shadow:0 1px 2px rgba(0,0,0,0.4);--hover:rgba(168,199,250,0.12);--active:#004a77}*{box-sizing:border-box}body,html{margin:0;height:100%;background:var(--bg);color:var(--ink)}body{font-family:Segoe UI,Roboto,Helvetica Neue,Arial,system-ui,sans-serif}button,input,select,textarea{font:inherit;color:inherit}button{cursor:pointer}img{max-width:100%}.shell{min-height:100%;display:flex;align-items:center;justify-content:center;padding:32px 16px;background:var(--bg)}.card{width:min(440px,100%);background:var(--surface);border-radius:28px;padding:32px;box-shadow:var(--shadow)}.card h1{margin:0 0 8px;font-size:32px;letter-spacing:-.03em}.card p{color:var(--muted);line-height:1.5}.actions{display:flex;flex-direction:column;gap:10px;margin-top:24px}.wordmark{width:48px;height:48px;border-radius:16px;background:var(--accent);color:var(--accent-ink);display:grid;place-items:center;font-weight:700;margin-bottom:16px}.app{height:100%;display:grid;grid-template-columns:76px 340px minmax(0,1fr);background:var(--bg)}.app.with-people{grid-template-columns:76px 320px minmax(0,1fr) 300px}.nav{background:var(--nav);display:flex;flex-direction:column;align-items:center;padding:12px 8px;gap:4px}.brand-mark{width:40px;height:40px;border-radius:14px;background:var(--accent);color:var(--accent-ink);display:grid;place-items:center;font-weight:700;margin-bottom:12px}.icon-btn,.nav-btn{border:0;background:transparent;color:var(--muted);border-radius:16px;display:flex;flex-direction:column;align-items:center;gap:2px;padding:8px 4px;width:64px}.nav-btn span{font-size:11px;font-weight:600}.icon-btn:hover,.nav-btn.active,.nav-btn:hover{background:var(--hover);color:var(--accent)}.nav-btn.active{color:var(--accent)}.nav-spacer{flex:1 1}.nav-btn.theme{margin-bottom:8px}.list{background:var(--surface);border-right:1px solid var(--line);display:flex;flex-direction:column;min-height:0}.list-head{display:flex;align-items:center;justify-content:space-between;padding:16px 16px 8px}.list-head h1{margin:0;font-size:22px;letter-spacing:-.02em}.search{margin:0 12px 8px;border:0;background:var(--bg);border-radius:24px;padding:10px 14px}.threads{overflow:auto;flex:1 1}.thread{width:100%;text-align:left;background:transparent;border:0;padding:10px 12px;display:grid;grid-template-columns:48px minmax(0,1fr) auto;grid-gap:12px;gap:12px;align-items:center;border-radius:0}.thread:hover{background:var(--hover)}.thread.active{background:var(--active)}.thread .name{font-weight:650}.thread .name,.thread .preview{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.thread .preview{color:var(--muted);font-size:13px;margin-top:2px}.thread .when{color:var(--muted);font-size:12px}.avatar{border-radius:50%;display:grid;place-items:center;color:#fff;font-weight:700;flex:none;letter-spacing:-.03em}.conversation{display:flex;flex-direction:column;min-width:0;min-height:0;background:var(--bg)}.pane-head{display:flex;align-items:center;gap:12px;padding:10px 12px;background:var(--surface);border-bottom:1px solid var(--line);min-height:64px}.pane-head .titles{min-width:0;flex:1 1}.pane-head .name{font-weight:700;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.pane-head .sub{color:var(--muted);font-size:12px}.head-actions{display:flex;gap:4px}.icon-btn.flat{width:40px;height:40px;padding:0;justify-content:center}.msgs{flex:1 1;overflow:auto;padding:16px 12px 8px;gap:8px}.bubble-wrap,.msgs{display:flex;flex-direction:column}.bubble-wrap{max-width:min(78%,520px)}.bubble-wrap.out{align-self:flex-end;align-items:flex-end}.bubble-wrap.in{align-self:flex-start;align-items:flex-start}.sender{font-size:12px;font-weight:700;color:var(--accent);margin:6px 8px 2px}.bubble{padding:10px 14px;border-radius:20px;line-height:1.4;white-space:pre-wrap;word-break:break-word}.bubble.in{background:var(--received);color:var(--received-ink);border-bottom-left-radius:6px}.bubble.out{background:var(--sent);color:var(--sent-ink);border-bottom-right-radius:6px}.bubble .meta{display:block;margin-top:4px;font-size:11px;opacity:.75}.bubble.out .meta{color:inherit}.bubble.failed{outline:2px solid var(--danger)}.media{margin-top:8px;max-width:240px;border-radius:12px;display:block}.compose{display:flex;gap:8px;align-items:flex-end;padding:10px 12px 14px;background:var(--surface);border-top:1px solid var(--line)}.compose textarea{flex:1 1;resize:none;min-height:44px;max-height:120px;border:0;border-radius:24px;padding:12px 16px;background:var(--bg)}.send{width:44px;height:44px;border:0;border-radius:50%;background:var(--accent);color:var(--accent-ink);display:grid;place-items:center}.send:disabled{opacity:.45}.attach-chip{display:flex;align-items:center;gap:8px;padding:0 12px 8px;background:var(--surface);font-size:13px;color:var(--muted)}.attach-chip img{width:40px;height:40px;object-fit:cover;border-radius:8px}.error{color:var(--danger);background:color-mix(in srgb,var(--danger) 12%,transparent);margin:0 12px 8px;padding:8px 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