diff --git a/index.html b/index.html
index f5ac6c5..755f316 100644
--- a/index.html
+++ b/index.html
@@ -50,8 +50,8 @@ button,input,textarea{font:inherit}button{cursor:pointer}.hidden{display:none!im
.status-line{display:flex;gap:8px;align-items:center;margin:7px 0 13px;color:#737a8b;font-size:12px}.status-line .pill{padding:4px 8px;border-radius:999px;background:#f1f2f6}.constraint-box{margin-top:13px;background:#f9faff;border:1px solid #e0e2ef;border-radius:11px;padding:11px 13px;font-size:13px;color:#52596c}
/* Workbench — two columns */
-.workbench-shell{min-height:calc(100vh - 54px);background:#f6f7fb}
-.work-head{background:#fff;border-bottom:1px solid var(--line);padding:15px 24px;position:relative;z-index:30}
+.workbench-shell{height:calc(100vh - 54px);display:flex;flex-direction:column;overflow:hidden;background:#f6f7fb}
+.work-head{background:#fff;border-bottom:1px solid var(--line);padding:15px 24px;position:relative;z-index:30;flex-shrink:0}
.work-head-inner{max-width:1540px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;gap:24px}
.work-title{font-size:21px;font-weight:790;line-height:1.35}.work-sub{font-size:12px;color:var(--muted);margin-top:4px}
.progress-mini{display:flex;gap:12px;align-items:center;min-width:270px;justify-content:flex-end}.progress-track{width:138px;height:6px;background:#eceef4;border-radius:999px;overflow:hidden}.progress-track div{height:100%;width:0;background:var(--brand);transition:.25s}.progress-txt{font-size:12px;color:#4d5569;font-weight:750;white-space:nowrap}.progress-txt.over{color:#b53a30}
@@ -59,9 +59,9 @@ button,input,textarea{font:inherit}button{cursor:pointer}.hidden{display:none!im
.constraint-input-row{display:flex;flex-direction:column;gap:8px;background:#fff;border:1px solid var(--line);border-radius:11px;padding:10px;box-shadow:var(--shadow);width:340px;position:absolute;right:24px;top:60px;z-index:40}
.constraint-input-row textarea{width:100%;min-height:64px;border:1px solid #e2e4ed;border-radius:9px;padding:8px 10px;font-size:12px;outline:0;resize:vertical}
.constraint-input-row .row-actions{display:flex;gap:8px;justify-content:flex-end}
-.work-grid{max-width:1540px;margin:0 auto;padding:16px 24px 96px;display:grid;grid-template-columns:minmax(0,46fr) minmax(0,54fr);gap:14px;align-items:start}
-.pane-card{background:#fff;border:1px solid var(--line);border-radius:14px;overflow:hidden;min-height:690px}.pane-head{height:54px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 16px;font-weight:740;font-size:13px}.pane-body{padding:18px}
-.sticky-pane{position:sticky;top:60px;height:calc(100vh - 150px);min-height:0;overflow:auto}
+.work-grid{flex:1;min-height:0;width:100%;max-width:1540px;margin:0 auto;padding:16px 24px;display:grid;grid-template-columns:minmax(0,46fr) minmax(0,54fr);gap:14px;align-items:stretch;overflow:hidden}
+.pane-card{background:#fff;border:1px solid var(--line);border-radius:14px;overflow:hidden}.pane-head{height:54px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 16px;font-weight:740;font-size:13px}.pane-body{padding:18px}
+.sticky-pane{min-height:0;overflow:auto}
.original-pane-head{height:58px;gap:12px;flex-wrap:nowrap}.original-pane-title{display:flex;align-items:center;gap:7px;white-space:nowrap}
.paragraph-switcher{display:flex;align-items:center;gap:6px;margin-left:auto;overflow-x:auto;max-width:min(420px,42vw);padding-bottom:1px}
@@ -83,11 +83,11 @@ button,input,textarea{font:inherit}button{cursor:pointer}.hidden{display:none!im
.full-original-list{display:flex;flex-direction:column;gap:9px}.mode-note{font-size:11px;color:#9299aa;margin:0 0 2px}.full-paragraph{border:1px solid transparent;border-radius:11px;padding:12px 13px;transition:.15s;cursor:pointer;position:relative}.full-paragraph:hover{background:#fafaff;border-color:#e8e8ff}.full-paragraph.active{background:#f7f7ff;border-color:#dedfff}.full-paragraph.active:before{content:"";position:absolute;left:-1px;top:12px;bottom:12px;width:3px;border-radius:3px;background:var(--brand)}.full-paragraph-head{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:6px}.full-paragraph-label{font-size:11.5px;font-weight:780;color:#42485b}.full-paragraph-state{font-size:10px;color:#8f96a6}.full-paragraph.active .full-paragraph-state{color:var(--brand);font-weight:750}.full-paragraph-copy{font:13.5px/1.72 Georgia,"Times New Roman",serif;color:#4a5060;margin:0}.full-paragraph-foot{display:flex;justify-content:flex-end;margin-top:7px}.full-issues-button{border:0;background:transparent;color:#6663d9;font-size:10.5px;font-weight:750;padding:2px 0}.full-issues-button:hover{text-decoration:underline}
.rewrite-card{min-height:0;display:flex;flex-direction:column}.rewrite-card .pane-head,.rewrite-card .write-tools{flex-shrink:0}.rewrite-card .pane-body{display:flex;flex-direction:column;flex:1;min-height:0;overflow-y:auto}.rewrite-intro{font-size:12px;color:#737b8d;margin-bottom:12px}.rewrite-area{width:100%;min-height:200px;border:1px solid #e2e4ed;border-radius:11px;outline:0;resize:none;padding:15px 16px;font:15px/1.8 Georgia,"Times New Roman",serif;color:#2f3443;background:#fff;transition:.15s}.rewrite-card .rewrite-area{flex:1}.rewrite-area:focus{border-color:#b9baff;box-shadow:0 0 0 3px rgba(86,84,245,.08)}.rewrite-meta{display:flex;justify-content:space-between;gap:10px;margin-top:8px;font-size:11px;color:#9aa0ad}.word-meta.warn{color:#b45309;font-weight:700}.translate-row{margin-top:10px;display:flex;align-items:center;gap:8px}.translate-row .btn.link{font-size:11.5px;font-weight:760;padding:0}.orig-translate-row{margin-top:9px;padding-top:8px;border-top:1px dashed #e8eaf3}.orig-translate-row .btn.link{font-size:11.5px;font-weight:760;padding:0}.orig-translate-box{margin-top:8px;background:#fafbff;border:1px solid #e8eaf6;border-radius:10px;padding:9px 10px}.ot-line{font-size:12.5px;line-height:1.75;color:#4c5468;padding:6px 9px;border-left:3px solid transparent;border-radius:6px;margin-bottom:5px;background:#fff}.ot-line:last-child{margin-bottom:0}.ot-line[data-note-id]{cursor:pointer}.ot-line sup{font-family:Inter,"PingFang SC",sans-serif;font-size:8px;font-weight:800;color:var(--note-strong,#514ee1);margin-right:3px}.ot-line.note-rhetoric,.ot-line.note-repeat,.ot-line.note-growth,.ot-line.note-structure{border-left-color:var(--note-line);background:var(--note-soft)}.ot-line.note-rhetoric.active,.ot-line.note-repeat.active,.ot-line.note-growth.active,.ot-line.note-structure.active{background:var(--note-bg);box-shadow:0 0 0 2px color-mix(in srgb,var(--note-line) 28%,transparent)}.translate-box{display:none;margin-top:8px;background:#f6f7ff;border:1px dashed #d9dcf5;border-radius:10px;padding:11px 12px;font-size:12px;color:#4c5468;line-height:1.75;white-space:pre-wrap}.translate-box.open{display:block}.translate-label{font-size:10px;color:#8b92a3;font-weight:800;margin-bottom:5px;display:block}.rewrite-help{margin-top:16px;border-top:1px solid var(--line);padding-top:13px}.help-entry{display:flex;align-items:center;gap:8px;font-size:11.5px;color:#777e8f}.help-entry .btn.link{font-size:11.5px;font-weight:760;padding:0}.help-panel{display:none;margin-top:10px;background:#fafbff;border:1px solid #e6e7f3;border-radius:10px;padding:11px 12px}.help-panel.open{display:block}.help-label{font-size:10px;color:#8b92a3;font-weight:800;margin-bottom:5px}.scaffold{font-size:12px;color:#50586a;line-height:1.7;white-space:pre-wrap}.reference-trigger{margin-top:9px;padding-top:8px;border-top:1px solid #eceef4}.reference{display:none;margin-top:8px;background:#fff;border:1px solid #e6e7ef;border-radius:8px;padding:9px 10px;font-size:11.5px;color:#596174;white-space:pre-wrap;line-height:1.7}.reference.open{display:block}.reference-note{font-size:10px;color:#9198a7;margin-top:6px}.write-tools{border-top:1px solid var(--line);padding:11px 14px;display:flex;justify-content:space-between;gap:10px;align-items:center}.nav-group{display:flex;gap:8px}.demo-hint{font-size:11px;color:#9a9fac}
-.submit-row{position:fixed;left:0;right:0;bottom:0;background:linear-gradient(180deg,rgba(246,247,251,0),#f6f7fb 35%);padding:28px 24px 16px;display:flex;justify-content:flex-end;z-index:25;pointer-events:none}.submit-row .submit-inner{width:100%;max-width:1540px;margin:0 auto;display:flex;justify-content:flex-end;align-items:center;gap:12px;pointer-events:auto}.submit-hint{font-size:12px;color:#8a6270}.submit-row .btn{padding:11px 18px}.recheck-history{position:fixed;right:24px;bottom:82px;width:min(440px,calc(100vw - 32px));max-height:54vh;overflow-y:auto;background:#fff;border:1px solid var(--line);border-radius:13px;box-shadow:0 16px 40px rgba(28,31,45,.18);padding:12px 13px;z-index:30;display:none}.recheck-history.open{display:block}.rhi-title{font-size:12px;font-weight:800;color:#3a4053;margin-bottom:8px}.recheck-history-item{border:1px solid #ecedf4;border-radius:10px;padding:9px 10px;margin-bottom:8px}.recheck-history-item:last-child{margin-bottom:0}.rhi-head{display:flex;align-items:center;gap:7px;font-size:11px;color:#666e80}.rhi-badge{font-size:10.5px;padding:2px 7px;border-radius:999px;font-weight:800}.rhi-badge.ok{background:var(--good-soft);color:#167655}.rhi-badge.warn{background:var(--warn-soft);color:#8a5d10}.rhi-latest{font-size:10px;color:var(--brand);font-weight:800}.rhi-meta{font-size:10.5px;color:#9aa0ad;margin-top:4px}.rhi-goal{font-size:11.5px;color:#4c5468;line-height:1.65;margin-top:5px}.rhi-revision{margin-top:7px}
+.submit-row{flex-shrink:0;padding:0 24px 16px;display:flex;justify-content:flex-end}.submit-row .submit-inner{width:100%;max-width:1540px;margin:0 auto;display:flex;justify-content:flex-end;align-items:center;gap:12px;pointer-events:auto}.submit-hint{font-size:12px;color:#8a6270}.submit-row .btn{padding:11px 18px}.recheck-history{position:fixed;right:24px;bottom:82px;width:min(440px,calc(100vw - 32px));max-height:54vh;overflow-y:auto;background:#fff;border:1px solid var(--line);border-radius:13px;box-shadow:0 16px 40px rgba(28,31,45,.18);padding:12px 13px;z-index:30;display:none}.recheck-history.open{display:block}.rhi-title{font-size:12px;font-weight:800;color:#3a4053;margin-bottom:8px}.recheck-history-item{border:1px solid #ecedf4;border-radius:10px;padding:9px 10px;margin-bottom:8px}.recheck-history-item:last-child{margin-bottom:0}.rhi-head{display:flex;align-items:center;gap:7px;font-size:11px;color:#666e80}.rhi-badge{font-size:10.5px;padding:2px 7px;border-radius:999px;font-weight:800}.rhi-badge.ok{background:var(--good-soft);color:#167655}.rhi-badge.warn{background:var(--warn-soft);color:#8a5d10}.rhi-latest{font-size:10px;color:var(--brand);font-weight:800}.rhi-meta{font-size:10.5px;color:#9aa0ad;margin-top:4px}.rhi-goal{font-size:11.5px;color:#4c5468;line-height:1.65;margin-top:5px}.rhi-revision{margin-top:7px}
.demo-panel{position:fixed;left:14px;bottom:14px;z-index:60}.demo-panel details{background:#fff;border:1px solid #dfe2ea;border-radius:10px;box-shadow:0 7px 20px rgba(23,27,42,.08);font-size:11px;color:#7d8495}.demo-panel summary{cursor:pointer;padding:7px 10px;font-weight:700;color:#666e80}.demo-panel .demo-body{padding:0 9px 9px;display:flex;gap:6px;flex-wrap:wrap;max-width:260px}
.loading-card{padding:20px 22px}.loading-title{font-size:16px;font-weight:760;margin-bottom:10px}.loading-row{display:flex;align-items:center;gap:9px;padding:7px 0;color:#687084;font-size:12px}.spinner{width:17px;height:17px;border:2px solid #dfe1ff;border-top-color:var(--brand);border-radius:50%;animation:spin .8s linear infinite}.loading-dot{width:8px;height:8px;border-radius:50%;background:#d7dbe6}.loading-row.active{color:#4247c7;font-weight:650}.loading-row.active .loading-dot{background:var(--brand)}.loading-hint{color:#b9770b;font-size:12px;font-weight:600;margin-top:8px}@keyframes spin{to{transform:rotate(360deg)}}
@media(max-width:1180px){.entry-shell{grid-template-columns:1fr 320px}.work-grid{gap:9px;padding-left:12px;padding-right:12px}.work-head{padding-left:14px;padding-right:14px}.pane-head{padding:0 12px}.progress-track{width:100px}.paragraph-switcher{max-width:min(280px,38vw)}}
-@media(max-width:900px){.work-grid{grid-template-columns:1fr}.sticky-pane{position:relative;top:auto;height:auto;max-height:none}.pane-card{min-height:auto}.rewrite-area{min-height:360px}.rewrite-card .rewrite-area{flex:none}.submit-row{position:relative;padding:0 12px 20px}.work-head-inner{align-items:flex-start}.progress-mini{min-width:0}.demo-panel{display:none}}
+@media(max-width:900px){.workbench-shell{height:auto;display:block;overflow:visible}.work-grid{grid-template-columns:1fr;align-items:start;overflow:visible}.sticky-pane{height:auto}.pane-card{min-height:auto}.rewrite-area{min-height:360px}.rewrite-card .rewrite-area{flex:none}.submit-row{padding:0 12px 20px}.work-head-inner{align-items:flex-start}.progress-mini{min-width:0}.demo-panel{display:none}}
@media(max-width:760px){.entry-shell{display:block;height:auto}.essay-pane{padding:24px 18px}.smart-pane{border-top:1px solid var(--line)}.smart-body{padding:24px 18px}.top-actions{display:none}.chat-wrap{padding:20px 12px 120px}.message{grid-template-columns:30px 1fr;gap:8px}.avatar{width:30px;height:30px}.bubble{padding:16px}.user .bubble{max-width:90%}.agent-table{font-size:11px}.work-grid{padding:12px}.work-head{padding:12px}.work-head-inner{display:block}.progress-mini{margin-top:8px;justify-content:flex-start}.progress-track{width:120px}.original-pane-head{height:auto;min-height:58px;flex-wrap:wrap;padding-top:9px;padding-bottom:9px}.paragraph-switcher{margin-left:0;max-width:100%}.pane-body{padding:14px}}