.chat-app { display: grid; grid-template-columns: 280px 1fr; height: 100%; height: 100dvh; }
.chat-side { background: var(--bg-sunken); border-right: 1px solid var(--line); display: flex; flex-direction: column; min-height: 0; padding: 12px 10px; gap: 8px; }
.chat-side .brand { padding: 4px 6px 8px; }
.cs-search { position: relative; }
.cs-search .input { padding-left: 32px; height: 34px; }
.cs-search svg { position: absolute; left: 10px; top: 9px; color: var(--text-3); width: 15px; height: 15px; }
.cs-list { flex: 1; overflow-y: auto; margin: 0 -4px; padding: 0 4px; }
.cs-group { font-size: 11px; color: var(--text-3); padding: 12px 8px 4px; text-transform: uppercase; letter-spacing: .06em; }
.cs-item { display: flex; align-items: center; gap: 6px; padding: 7px 8px; border-radius: var(--radius-sm); cursor: pointer; color: var(--text-2); position: relative; }
.cs-item:hover { background: var(--surface-hover); color: var(--text); }
.cs-item.active { background: var(--surface-3); color: var(--text); }
.cs-item .t { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.cs-item .acts { display: none; gap: 2px; }
.cs-item:hover .acts, .cs-item.active .acts { display: flex; }
.cs-item .acts button { background: none; border: 0; color: var(--text-3); padding: 3px; border-radius: 5px; cursor: pointer; display: grid; }
.cs-item .acts button:hover { background: var(--surface-hover); color: var(--text); }
.cs-item .pinned { color: var(--c-amber); }
.cs-foot { border-top: 1px solid var(--line); padding-top: 10px; display: grid; gap: 8px; }
.usage-pill { font-size: 11.5px; color: var(--text-3); padding: 0 6px; }
.usage-pill .hbar { margin: 5px 0 3px; }
.chat-main { display: flex; flex-direction: column; min-width: 0; min-height: 0; position: relative; }
.chat-top { display: flex; align-items: center; gap: 8px; padding: 10px 16px; border-bottom: 1px solid var(--line); min-height: 56px; }
.chat-top .grow { flex: 1; }
.model-pick { position: relative; }
.model-btn { display: flex; align-items: center; gap: 8px; border: 1px solid transparent; background: none; color: var(--text); padding: 6px 10px; border-radius: var(--radius-sm); cursor: pointer; font-weight: 560; font-size: 14px; }
.model-btn:hover { background: var(--surface-hover); }
.model-menu { position: absolute; top: calc(100% + 6px); left: 0; z-index: 30; width: 340px; max-height: 60vh; overflow-y: auto; background: var(--surface); border: 1px solid var(--line-2); border-radius: var(--radius-lg); box-shadow: var(--shadow-lg); padding: 6px; }
.model-opt { padding: 9px 10px; border-radius: var(--radius-sm); cursor: pointer; display: flex; gap: 10px; align-items: flex-start; }
.model-opt:hover { background: var(--surface-hover); }
.model-opt.on { background: var(--surface-3); }
.model-opt.locked { opacity: .55; }
.model-opt .d { font-size: 12px; color: var(--text-3); }
.chat-scroll { flex: 1; overflow-y: auto; scroll-behavior: smooth; }
.chat-col { max-width: 780px; margin: 0 auto; padding: 24px 20px 12px; display: flex; flex-direction: column; gap: 22px; }
.m-row { display: flex; gap: 12px; }
.m-row.user { justify-content: flex-end; }
.m-row.user .m-body { background: var(--surface-2); border: 1px solid var(--line); border-radius: 16px; padding: 9px 14px; max-width: 85%; white-space: pre-wrap; overflow-wrap: anywhere; }
.m-av { width: 28px; height: 28px; flex: none; border-radius: 8px; background: var(--surface-3); display: grid; place-items: center; color: var(--c-analyst); margin-top: 2px; }
.m-row.assistant .m-body { flex: 1; min-width: 0; overflow-wrap: anywhere; line-height: 1.65; font-size: calc(14px * var(--fs, 1)); }
.m-actions { display: flex; gap: 2px; margin-top: 6px; opacity: 0; transition: opacity .15s; }
.m-row:hover .m-actions, .m-row:last-child .m-actions { opacity: 1; }
.m-actions button { background: none; border: 0; color: var(--text-3); padding: 5px 7px; border-radius: 6px; cursor: pointer; display: flex; gap: 5px; align-items: center; font-size: 12px; }
.m-actions button:hover { background: var(--surface-hover); color: var(--text); }
.sources { display: flex; gap: 6px; flex-wrap: wrap; margin: 0 0 10px; }
.src-chip { display: flex; align-items: center; gap: 6px; font-size: 11.5px; border: 1px solid var(--line-2); border-radius: 99px; padding: 3px 10px 3px 8px; color: var(--text-2); text-decoration: none; max-width: 240px; }
.src-chip:hover { background: var(--surface-hover); }
.src-chip b { color: var(--c-analyst); font-weight: 600; }
.src-chip span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.status-line { color: var(--text-3); display: flex; gap: 8px; align-items: center; font-size: 12.5px; }
.err-line { color: var(--bad); font-size: 13px; background: color-mix(in oklab, var(--bad) 10%, transparent); padding: 8px 12px; border-radius: var(--radius-sm); }
.composer-wrap { padding: 8px 16px 16px; }
.composer { max-width: 780px; margin: 0 auto; border: 1px solid var(--line-2); border-radius: 20px; background: var(--surface); box-shadow: var(--shadow); padding: 10px 10px 8px 14px; }
.composer:focus-within { border-color: color-mix(in oklab, var(--c-analyst) 55%, var(--line-2)); }
.composer textarea { width: 100%; border: 0; outline: 0; background: none; resize: none; font-size: 14.5px; line-height: 1.55; max-height: 220px; min-height: 26px; padding: 4px 0; }
.composer-bar { display: flex; align-items: center; gap: 6px; margin-top: 4px; }
.tool-btn { display: flex; align-items: center; gap: 6px; border: 1px solid var(--line-2); background: none; color: var(--text-2); border-radius: 99px; padding: 5px 11px; cursor: pointer; font-size: 12.5px; }
.tool-btn:hover { background: var(--surface-hover); color: var(--text); }
.tool-btn.on { color: var(--c-analyst); border-color: var(--c-analyst); background: color-mix(in oklab, var(--c-analyst) 10%, transparent); }
.tool-btn:disabled { opacity: .45; cursor: not-allowed; }
.send-btn { width: 34px; height: 34px; border-radius: 50%; border: 0; background: var(--invert); color: var(--invert-text); cursor: pointer; display: grid; place-items: center; }
.send-btn:disabled { opacity: .35; cursor: default; }
.attach-chip { display: inline-flex; gap: 6px; align-items: center; font-size: 12px; background: var(--surface-3); border-radius: 8px; padding: 3px 8px; margin-bottom: 6px; }
.attach-chip button { background: none; border: 0; color: var(--text-3); cursor: pointer; }
.composer-note { text-align: center; font-size: 11.5px; color: var(--text-4); margin-top: 8px; }
.welcome { flex: 1; display: grid; place-content: center; text-align: center; padding: 24px; gap: 8px; }
.welcome h1 { font-size: 30px; letter-spacing: -0.04em; margin: 0; font-weight: 580; }
.suggest { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; max-width: 640px; margin: 22px auto 0; }
.suggest button { text-align: left; border: 1px solid var(--line-2); background: var(--surface); border-radius: var(--radius); padding: 12px 14px; cursor: pointer; color: var(--text-2); }
.suggest button:hover { background: var(--surface-hover); color: var(--text); }
.suggest b { display: block; color: var(--text); margin-bottom: 2px; font-weight: 540; }
.chat-menu-btn { display: none; }
.pop { position: absolute; z-index: 40; bottom: 60px; left: 10px; width: 240px; background: var(--surface); border: 1px solid var(--line-2); border-radius: var(--radius); box-shadow: var(--shadow-lg); padding: 6px; }
.pop button { display: flex; width: 100%; gap: 8px; align-items: center; background: none; border: 0; color: var(--text-2); padding: 8px 10px; border-radius: var(--radius-sm); cursor: pointer; text-align: left; }
.pop button:hover { background: var(--surface-hover); color: var(--text); }
.pop hr { border: 0; border-top: 1px solid var(--line); margin: 4px 0; }
.plans-page { max-width: 980px; margin: 0 auto; padding: 28px 20px; }
@media (max-width: 860px) {
  .chat-app { grid-template-columns: 1fr; }
  .chat-side { position: fixed; z-index: 60; inset: 0 auto 0 0; width: 292px; transform: translateX(-100%); transition: transform .2s var(--ease-out); }
  .sb-open .chat-side { transform: none; }
  .chat-menu-btn { display: inline-flex; }
  .suggest { grid-template-columns: 1fr; }
  .model-menu { width: min(340px, 92vw); }
}