:root {
  --bg: #f6f7f9; --panel: #ffffff; --text: #1f2328; --muted: #7b8490; --border: #e6e9ed;
  --accent: #2f6df6; --accent-text: #fff; --danger: #d92d20; --ok: #16a34a; --warn: #d97706;
  --user-bg: #eaf1ff; --soft: #f1f3f6; --hl: #fff3bf; --code-bg: #f4f6f8; --shadow: 0 10px 30px rgba(20,30,50,.14);
  --c1: #2f6df6; --c2: #d97706; --c3: #16a34a;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14171b; --panel: #1b1f25; --text: #e6e8eb; --muted: #8c96a1; --border: #2a3038;
    --accent: #4b83f7; --user-bg: #1e2a44; --soft: #232830; --hl: #4a3f10; --code-bg: #171b20; --shadow: 0 10px 30px rgba(0,0,0,.5);
    --c1: #60a5fa; --c2: #fbbf24; --c3: #4ade80;
  }
}
* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body { background: var(--bg); color: var(--text); font: 15px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
.hidden { display: none !important; }
.muted { color: var(--muted); } .small { font-size: 12.5px; }
.spacer { flex: 1; }
button, select, textarea, input { font: inherit; color: inherit; }
button { cursor: pointer; border: 1px solid var(--border); background: var(--panel); border-radius: 8px; padding: 7px 14px; }
button:hover { border-color: var(--accent); }
button:disabled { opacity: .5; cursor: default; }
button.primary { background: var(--accent); color: var(--accent-text); border-color: var(--accent); }
button.danger { background: var(--danger); color: #fff; border-color: var(--danger); }
button.ghost { background: transparent; border-color: transparent; color: var(--text); }
button.ghost:hover { background: var(--soft); border-color: transparent; }
button.small { padding: 4px 10px; font-size: 13px; }
.btn { display: inline-block; border: 1px solid var(--border); background: var(--panel); border-radius: 8px; padding: 7px 14px; cursor: pointer; }
.btn:hover { border-color: var(--accent); }
.ghost-link { color: var(--muted); text-decoration: none; font-size: 14px; padding: 4px 8px; border-radius: 6px; }
.ghost-link:hover { background: var(--soft); color: var(--text); }
select { padding: 4px 8px; border: 1px solid var(--border); border-radius: 8px; background: var(--panel); }
.err { color: var(--danger); min-height: 1.4em; }

.login { position: fixed; inset: 0; display: flex; align-items: center; justify-content: center; padding: 16px; }
.login-card { background: var(--panel); border: 1px solid var(--border); border-radius: 14px; padding: 28px; width: 100%; max-width: 340px; display: flex; flex-direction: column; gap: 12px; box-shadow: var(--shadow); }
.login-card h1 { font-size: 18px; margin: 0 0 4px; font-weight: 600; }
.login-card input { padding: 10px 12px; border: 1px solid var(--border); border-radius: 8px; background: var(--bg); }

.app { display: flex; flex-direction: column; height: 100%; }
.topbar { display: flex; align-items: center; gap: 10px; padding: 8px 16px; }
.brand { font-weight: 600; font-size: 16px; }
.badge { padding: 3px 12px; border-radius: 999px; background: var(--soft); font-size: 13px; color: var(--muted); }
.badge.ok { background: color-mix(in srgb, var(--ok) 16%, transparent); color: var(--ok); }
.badge.warn { background: color-mix(in srgb, var(--warn) 18%, transparent); color: var(--warn); }
.badge.bad { background: color-mix(in srgb, var(--danger) 14%, transparent); color: var(--danger); }

.dd { position: relative; }
.dd-panel { position: absolute; left: 0; top: calc(100% + 6px); min-width: 260px; max-width: 92vw; background: var(--panel); border: 1px solid var(--border); border-radius: 12px; box-shadow: var(--shadow); z-index: 30; padding: 10px; }
.dd-panel.right { left: auto; right: 0; }
.dd.up .dd-panel { top: auto; bottom: calc(100% + 6px); }
.menu-row { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 6px 4px; }
.menu-item { display: block; width: 100%; text-align: left; border: none; background: transparent; padding: 8px 6px; border-radius: 6px; }
.menu-item:hover { background: var(--soft); }

.main { flex: 1; min-height: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 14px; padding: 0 16px 8px; }
.pane { min-height: 0; display: flex; flex-direction: column; background: var(--panel); border-radius: 14px; border: 1px solid var(--border); overflow: hidden; }

.chat-scroll { flex: 1; overflow: auto; padding: 18px 22px 8px; }
.chat-log { display: flex; flex-direction: column; gap: 16px; max-width: 760px; margin: 0 auto; }
.turn { display: flex; flex-direction: column; gap: 8px; }
.msg.user { align-self: flex-end; background: var(--user-bg); border-radius: 14px; padding: 8px 14px; max-width: 88%; white-space: pre-wrap; overflow-wrap: anywhere; }
.msg.assistant { overflow-wrap: anywhere; }
.msg.assistant.synthetic { color: var(--warn); }
.msg .body > :first-child { margin-top: 0; } .msg .body > :last-child { margin-bottom: 0; }
.msg .body pre { background: var(--code-bg); padding: 10px; border-radius: 8px; overflow: auto; }
.msg .body code { background: var(--code-bg); padding: 1px 5px; border-radius: 4px; }
.msg .body table { border-collapse: collapse; } .msg .body td, .msg .body th { border: 1px solid var(--border); padding: 3px 8px; }
.meta { margin-top: 4px; font-size: 12px; color: var(--muted); }

details > summary { cursor: pointer; color: var(--muted); font-size: 13px; list-style: none; }
details > summary::-webkit-details-marker { display: none; }
details > summary::before { content: "▸ "; }
details[open] > summary::before { content: "▾ "; }
.steps { background: var(--soft); border-radius: 10px; padding: 6px 12px; }
.steps .step { margin: 6px 0; font-size: 13px; }
.steps .st-head { font-family: ui-monospace, Menlo, Consolas, monospace; }
.steps .st-res { color: var(--muted); overflow-wrap: anywhere; }
.steps .st-res.error { color: var(--danger); }
.steps .st-txt { color: var(--muted); }
.think-box .tt { white-space: pre-wrap; padding: 4px 10px; border-left: 2px solid var(--border); margin: 4px 0; max-height: 220px; overflow: auto; color: var(--muted); font-size: 13px; }
.turn-sum { font-size: 12.5px; color: var(--muted); }
.turn-sum .sum-body { margin-top: 4px; line-height: 1.7; }
.turn-sum b { color: var(--text); font-weight: 600; }
.live .body { white-space: pre-wrap; }
.live .status { color: var(--muted); font-size: 13px; }
.spin { display: inline-block; width: 10px; height: 10px; border: 2px solid var(--border); border-top-color: var(--accent); border-radius: 50%; animation: sp .8s linear infinite; vertical-align: -1px; margin-right: 6px; }
@keyframes sp { to { transform: rotate(360deg); } }

.banner { margin: 0 22px 6px; padding: 7px 12px; border-radius: 10px; background: color-mix(in srgb, var(--warn) 14%, transparent); font-size: 13px; }
.banner.bad { background: color-mix(in srgb, var(--danger) 12%, transparent); }
.composer { display: flex; gap: 8px; align-items: flex-end; padding: 10px 16px 14px; }
.composer textarea { flex: 1; resize: none; min-height: 44px; max-height: 180px; padding: 10px 14px; border: 1px solid var(--border); border-radius: 12px; background: var(--bg); }
.composer textarea:focus { outline: 2px solid color-mix(in srgb, var(--accent) 40%, transparent); }
.composer button { height: 44px; border-radius: 12px; }

.pv-head { display: flex; align-items: center; gap: 8px; padding: 8px 12px; border-bottom: 1px solid var(--border); }
.pv-head #files-btn { font-weight: 600; max-width: 320px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.seg { display: inline-flex; background: var(--soft); border-radius: 8px; padding: 2px; flex-wrap: wrap; gap: 2px; }
.seg button { border: none; border-radius: 6px; padding: 3px 10px; background: transparent; font-size: 13px; }
.seg button.active { background: var(--panel); box-shadow: 0 1px 2px rgba(0,0,0,.12); }
.pv-info { padding: 6px 16px; font-size: 12.5px; color: var(--muted); min-height: 28px; }
.pv-body { flex: 1; overflow: auto; }
.pv-body .empty { color: var(--muted); padding: 60px 20px; text-align: center; }
.src { font-family: ui-monospace, Menlo, Consolas, monospace; font-size: 13px; line-height: 1.6; padding: 4px 0 20px; }
.src .row { display: flex; }
.src .n { flex: none; width: 3.6em; text-align: right; padding-right: 12px; color: var(--muted); opacity: .7; user-select: none; }
.src .t { flex: 1; white-space: pre-wrap; overflow-wrap: anywhere; padding-right: 16px; min-height: 1.6em; }
.src .row.chg { background: var(--hl); }
.src .row.flash { animation: fl 2.2s ease-out; }
.src .row.del { box-shadow: 0 2px 0 0 var(--danger); }
.src.del0 { box-shadow: inset 0 2px 0 0 var(--danger); }
@keyframes fl { from { background: var(--accent); } to { background: var(--hl); } }
.md { padding: 6px 24px 24px; overflow-wrap: anywhere; }
.md pre { background: var(--code-bg); padding: 10px; border-radius: 8px; overflow: auto; }
.md table { border-collapse: collapse; } .md td, .md th { border: 1px solid var(--border); padding: 3px 8px; }
.md .chg-note { background: var(--hl); padding: 4px 10px; border-radius: 8px; margin-bottom: 10px; font-size: 13px; }

.file-list { list-style: none; margin: 0; padding: 0; max-height: 320px; overflow: auto; min-width: 300px; }
.file-list li { padding: 7px 10px; border-radius: 8px; cursor: pointer; }
.file-list li:hover { background: var(--soft); }
.file-list li.active { background: color-mix(in srgb, var(--accent) 10%, transparent); }
.file-list .fname { font-weight: 500; overflow-wrap: anywhere; }
.file-list .fmeta { font-size: 12px; color: var(--muted); }
.file-list .dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; background: var(--warn); margin-left: 6px; }
.dropzone { margin-top: 8px; padding: 10px; border: 1px dashed var(--border); border-radius: 10px; text-align: center; }
.dropzone.over { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 8%, transparent); }
.upload-msg { font-size: 12.5px; color: var(--muted); white-space: pre-wrap; } .upload-msg .bad { color: var(--danger); }

.simbar { padding: 4px 16px 10px; display: flex; align-items: center; gap: 12px; }
.sim-panel { width: 640px; }
.sim-row { display: flex; align-items: center; gap: 12px; margin-bottom: 10px; flex-wrap: wrap; }
.sim-msg { color: var(--danger); font-size: 13px; }
.sim-main, .sim-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px 16px; font-variant-numeric: tabular-nums; }
.sim-main .k, .sim-stats .k { color: var(--muted); font-size: 12px; } .sim-main .v, .sim-stats .v { font-weight: 600; font-size: 16px; }
.sim-stats .v { font-size: 14px; }
.sim-more { margin-top: 10px; } .sim-more .sim-stats { margin: 8px 0; }
#sim-chart { width: 100%; height: 110px; }
.stats-body { min-width: 290px; font-size: 13.5px; font-variant-numeric: tabular-nums; }
.stats-body .grp { margin-bottom: 10px; } .stats-body .gt { color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: .04em; }
.stats-body .r { display: flex; justify-content: space-between; gap: 16px; }