:root{
  --brand:#4A47B1; --accent:#6965DB; --accent-soft:#E3E2FE;
  --primary-hover:#5753D0; --primary-active:#4440BF;
  --app-bg:#ECECF4; --surface:#FFFFFF; --surface-2:#F6F6F9;
  --border:#EBEBEB; --border-strong:#D6D6D6;
  --ink-900:#1B1B1F; --ink-600:#5E5E5E; --ink-400:#9A9A9A;
  --ok:#2F9E44; --ok-soft:#CAFCCC; --ok-text:#15663F; --ok-border:#BFE6CF;
  --warn:#C8922F; --warn-soft:#FCEECA; --danger:#DB6965;
  --wechat-bg:#EDEDED; --wechat-green:#95EC69;
  --center-bg:#F6F8FC; --chat-bg:#D7DCE3; --selected-bg:#E9F2FF;
  --upload-border:#C9DDFB;
  --rail-w:172px; --panel-w:360px;
}

*{box-sizing:border-box;-webkit-user-drag:none}
html,body{height:100%;margin:0}
svg.lucide{width:var(--isz,16px);height:var(--isz,16px);stroke-width:2;flex:none;display:block}
body{
  background:var(--app-bg); color:var(--ink-900);
  font-family:"Noto Sans SC",-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;
  font-size:13px; line-height:1.4;
  display:flex; flex-direction:column; overflow:hidden;
}
button{font-family:inherit}

/* state visibility */
body[data-state="empty"] .when-work{display:none!important}
body[data-state="work"]  .when-empty{display:none!important}

/* ============ TopBar ============ */
#topbar{
  height:60px; flex:0 0 auto; background:var(--surface);
  border-bottom:1px solid var(--border);
  display:flex; align-items:center; justify-content:space-between; padding:0 24px;
}
.brand{display:flex; align-items:center; gap:12px}
.lockup{display:flex; align-items:center; gap:8px}
.mark{
  width:28px; height:28px; border-radius:7px; background:var(--brand); color:#fff;
  display:flex; align-items:center; justify-content:center; --isz:16px;
}
.appname{font-size:15px; font-weight:600; color:var(--ink-900)}
.sub-muted{font-size:12px; color:var(--ink-400)}
.tb-loaded{display:inline-flex; align-items:center; gap:12px}
.vdiv{width:1px; height:16px; background:var(--border-strong)}
.sub-file{font-size:13px; color:var(--ink-600)}
.tb-right{display:flex; align-items:center; gap:12px}
.privacy{
  display:inline-flex; align-items:center; gap:7px;
  background:var(--ok-soft); border:1px solid var(--ok-border); border-radius:7px;
  padding:6px 11px; color:var(--ok-text); font-size:12px; font-weight:500; --isz:13px;
}
.privacy svg{color:var(--ok)}
.ghost-btn{
  display:inline-flex; align-items:center; gap:6px;
  background:var(--surface-2); color:var(--ink-600);
  border:1px solid var(--border); border-radius:7px; padding:7px 12px;
  font-size:12.5px; cursor:pointer; --isz:13px;
}
.ghost-btn:hover{background:#eceaf7; color:var(--ink-900)}

/* ============ Body ============ */
#body{flex:1; display:flex; min-height:0}

/* ---------- NavRail ---------- */
#rail{
  width:var(--rail-w); flex:0 0 auto; background:var(--surface);
  border-right:1px solid var(--border); display:flex; flex-direction:column; min-height:0;
}
.navhead{padding:14px 14px 8px; display:flex; flex-direction:column; gap:6px}
.nh-title{font-size:13px; font-weight:600; color:var(--ink-900)}
.tag{
  align-self:flex-start; display:inline-flex; align-items:center; gap:4px;
  background:var(--surface-2); border:1px solid var(--border); border-radius:5px;
  padding:3px 6px; color:var(--ink-400); font-size:10px; --isz:11px;
}
.rail-empty{flex:1; min-height:0; display:flex; flex-direction:column}
.rail-explain{
  margin:0; padding:2px 14px 10px; color:var(--ink-400);
  font-size:11.5px; line-height:1.45;
}
.ghost-wrap{flex:1; min-height:0; display:flex; justify-content:center; align-items:stretch;
  padding:2px 0 16px; opacity:.45}
.ghost-band{
  width:54px; background:var(--surface-2); border:1px solid var(--border-strong);
  border-radius:6px; overflow:hidden; display:flex; flex-direction:column; gap:3px; padding:5px;
}
.ghost-band span{display:block; height:18px; border-radius:3px; background:#E4E4EC; flex:none}
.ghost-band span:nth-child(3n){background:#EDEDF4}
.band-wrap{flex:1; min-height:0; display:flex; justify-content:center; align-items:stretch;
  padding:4px 0 16px}
#band{
  position:relative; width:54px; background:var(--surface-2);
  border:1px solid var(--border); border-radius:6px; overflow:hidden; cursor:pointer;
}
#bandSegs{position:absolute; inset:0}
#bandSegs .bseg{position:absolute; left:0; right:0; overflow:hidden}
#bandSegs .bseg img{display:block; width:100%; opacity:.92}
#bandSegs .bbound{position:absolute; left:0; right:0; height:0;
  border-top:2px dashed var(--warn); background:var(--warn-soft)}
.band-selfill{position:absolute; left:0; right:0; background:rgba(105,101,219,.25); pointer-events:none}
.band-seledge{position:absolute; left:0; right:0; height:4px; background:var(--accent); pointer-events:none}
.band-nub{position:absolute; width:12px; height:12px; left:50%; margin-left:-6px; border-radius:6px;
  background:var(--accent); border:2px solid #fff; pointer-events:none}
.band-view{position:absolute; left:0; right:0; border:1.5px solid rgba(74,71,177,.55);
  background:rgba(74,71,177,.06); pointer-events:none}

/* ---------- Center ---------- */
#center{flex:1; min-width:0; display:flex; flex-direction:column}

/* empty hero */
.center-empty{
  flex:1; min-height:0; background:var(--center-bg);
  display:flex; flex-direction:column; align-items:center; justify-content:center;
  gap:32px; padding:40px; overflow:auto;
}
.hero{display:flex; flex-direction:column; align-items:center; gap:14px; text-align:center}
.hero h1{margin:0; font-size:28px; font-weight:700; color:var(--ink-900); letter-spacing:.2px}
.hero p{margin:0; max-width:500px; font-size:14.5px; line-height:1.55; color:var(--ink-600)}
.upload-card{
  width:520px; max-width:90%; background:#fff; border:2px solid var(--upload-border);
  border-radius:18px; padding:46px 40px; display:flex; flex-direction:column; align-items:center;
  gap:16px; box-shadow:0 10px 30px rgba(105,101,219,.12); transition:border-color .15s, background .15s;
}
.upload-card.hot{border-color:var(--accent); background:#F4F2FE}
.up-circle{
  width:74px; height:74px; border-radius:50%; background:var(--accent-soft);
  display:flex; align-items:center; justify-content:center; color:var(--accent); --isz:31px;
}
.up-hint{font-size:15px; font-weight:500; color:var(--ink-900)}
.up-btn{
  display:inline-flex; align-items:center; gap:8px; background:var(--accent); color:#fff;
  border:0; border-radius:10px; padding:13px 26px; font-size:14px; font-weight:600;
  cursor:pointer; --isz:16px; box-shadow:0 4px 12px rgba(105,101,219,.33);
}
.up-btn:hover{background:var(--primary-hover)}
.up-note{display:inline-flex; align-items:center; gap:6px; color:var(--ink-400);
  font-size:12px; --isz:12px}
.feature-row{display:flex; align-items:center}
.feature{display:flex; align-items:center; gap:10px; padding:6px 22px}
.f-ic{width:32px; height:32px; border-radius:50%; background:var(--accent-soft);
  display:flex; align-items:center; justify-content:center; color:var(--accent); --isz:16px}
.f-col{display:flex; flex-direction:column; gap:1px}
.f-t{font-size:12.5px; font-weight:600; color:var(--ink-900)}
.f-s{font-size:11px; color:var(--ink-400)}
.f-div{width:1px; height:30px; background:var(--border)}

/* work detail */
.detail{flex:1; min-height:0; display:flex; flex-direction:column; background:var(--app-bg)}
.dhead{
  height:52px; flex:0 0 auto; background:var(--surface); border-bottom:1px solid var(--border);
  display:flex; align-items:center; justify-content:space-between; padding:0 20px; gap:12px;
}
.dh-l{display:flex; align-items:center; gap:10px; min-width:0}
.dh-title{font-size:14px; font-weight:600; white-space:nowrap}
.dh-sub{font-size:12.5px; color:var(--ink-400); white-space:nowrap; overflow:hidden; text-overflow:ellipsis}
.dh-r{display:flex; align-items:center; gap:8px}
.zoom{display:flex; align-items:center; background:var(--surface); border:1px solid var(--border);
  border-radius:7px; overflow:hidden}
.zoom button{width:30px; height:28px; border:0; background:#fff; cursor:pointer; color:var(--ink-600);
  display:flex; align-items:center; justify-content:center; --isz:14px}
.zoom button:hover{background:var(--surface-2)}
.zoom-lvl{width:48px; height:28px; display:flex; align-items:center; justify-content:center;
  border-left:1px solid var(--border); border-right:1px solid var(--border);
  font-size:12px; font-weight:500; color:var(--ink-900)}
.chat-viewport{
  flex:1; min-height:0; overflow-y:auto; overflow-x:hidden; background:var(--chat-bg);
  display:flex; justify-content:center; position:relative;
}
.phone-col{position:relative; background:var(--wechat-bg); flex:0 0 auto; width:430px;
  height:max-content; min-height:100%}
.phone-col .seg-img{display:block; width:100%}
.phone-col .seg-img img{display:block; width:100%}
.phone-col .seg-divider{
  height:34px; background:var(--warn-soft); border-top:1px solid var(--warn);
  border-bottom:1px solid var(--warn); display:flex; align-items:center; justify-content:center;
  gap:6px; color:var(--warn); font-size:11.5px; font-weight:600; --isz:13px;
}
.region-dim{position:absolute; left:0; right:0; background:rgba(40,40,60,.32); pointer-events:none; z-index:2}
.region-sel{position:absolute; left:0; right:0; background:rgba(105,101,219,.12);
  border-left:3px solid var(--accent); pointer-events:none; z-index:2}
/* 低置信接缝标注：引擎未能像素实证该处对齐（fail-visible，DOM overlay，不碰图像素） */
.seam-warn{position:absolute; left:0; right:0; height:0; z-index:5; pointer-events:none}
.seam-warn::before{content:""; position:absolute; left:0; right:0; top:-1px; height:2px;
  background:repeating-linear-gradient(90deg, var(--warn) 0 8px, transparent 8px 14px)}
.seam-warn span{position:absolute; top:3px; left:6px; display:inline-flex; align-items:center; gap:4px;
  background:var(--warn-soft); border:1px solid var(--warn); color:var(--warn); border-radius:4px;
  padding:2px 7px; font-size:10.5px; font-weight:600; pointer-events:auto; white-space:nowrap; --isz:11px}

/* handles (children of phone-col) */
.handle{position:absolute; left:0; right:0; height:0; z-index:6; cursor:ns-resize}
.handle .h-line{position:absolute; left:0; right:0; height:1px; background:var(--accent); opacity:.7}
.handle-start .h-line{top:0}
.handle-end .h-line{bottom:0}
/* pill sits in the left gutter (outside the phone content) so it never covers chat text */
.handle .h-pill{position:absolute; right:100%; margin-right:10px; display:inline-flex; align-items:center; gap:6px;
  background:var(--accent); color:#fff; font-size:12.5px; font-weight:600; padding:5px 11px;
  border-radius:14px; --isz:14px; box-shadow:0 2px 6px rgba(105,101,219,.33); white-space:nowrap}
.handle-start .h-pill{top:-13px}
.handle-end .h-pill{bottom:-13px}
.h-del{border:0; padding:0; margin-left:3px; width:16px; height:16px; border-radius:50%;
  background:rgba(255,255,255,.28); color:#fff; cursor:pointer; --isz:12px;
  display:inline-flex; align-items:center; justify-content:center; flex:none}
.h-del:hover{background:rgba(255,255,255,.5)}
/* 截取图片：选完起点+终点后，出现在终点右侧的留白处（不压住聊天内容） */
.handle-end .h-capture{position:absolute; left:100%; margin-left:10px; top:50%; transform:translateY(-50%);
  display:inline-flex; align-items:center; gap:7px; --isz:16px; cursor:pointer;
  background:var(--accent); color:#fff; font-size:13px; font-weight:600;
  padding:9px 16px; border:0; border-radius:8px; white-space:nowrap;
  box-shadow:0 3px 12px rgba(74,71,177,.4)}
.handle-end .h-capture:hover{filter:brightness(1.07)}
.handle-end .h-capture:active{transform:translateY(-50%) scale(.97)}
.handle-end .h-capture[hidden]{display:none}

/* ---------- Panel ---------- */
#panel{width:var(--panel-w); flex:0 0 auto; background:var(--surface);
  border-left:1px solid var(--border); display:flex; flex-direction:column; min-height:0}
.panel-empty,.panel-work{flex:1; min-height:0; display:flex; flex-direction:column}
.phead{padding:16px 16px 0}
.ph-row{display:flex; align-items:baseline; justify-content:space-between}
.ph-title{font-size:15px; font-weight:600; color:var(--ink-900)}
.ph-count{font-size:12px; color:var(--ink-400)}
.ph-explain{margin-top:6px; font-size:11.5px; line-height:1.45; color:var(--ink-400)}
.ghost-area{flex:1; min-height:0; display:flex; flex-direction:column; gap:13px;
  padding:13px 16px; opacity:.4}
.ghost-card{height:120px; background:var(--surface-2); border:1px solid var(--border); border-radius:10px}
.seg-list{flex:1; min-height:0; overflow-y:auto; padding:13px 16px; display:flex;
  flex-direction:column; gap:13px}
.seg-empty{color:var(--ink-400); font-size:12.5px; text-align:center; padding:40px 10px; line-height:1.7}
.seg{background:var(--surface-2); border:1px solid var(--border); border-radius:10px;
  padding:13px; display:flex; flex-direction:column; gap:10px}
.seg.excluded{opacity:.7; border-style:dashed}
.seg-title-row{display:flex; align-items:center; justify-content:space-between}
.seg-tl{display:flex; align-items:center; gap:8px; min-width:0}
.seg-dot{width:9px; height:9px; border-radius:50%; background:var(--accent); flex:none}
.seg-name{font-size:13.5px; font-weight:600; color:var(--ink-900); white-space:nowrap;
  overflow:hidden; text-overflow:ellipsis}
.seg-name-input{font:inherit; font-size:13.5px; font-weight:600; border:1px solid var(--accent);
  border-radius:5px; padding:1px 5px; outline:none; width:120px}
.seg-edit{color:var(--ink-400); cursor:pointer; display:flex; --isz:12px}
.seg-edit:hover{color:var(--accent)}
.seg-badge{font-size:10px; font-weight:600; padding:1px 6px; border-radius:4px; flex:none}
.seg-badge.kind-chat{background:var(--ok-soft); color:var(--ok-text)}
.seg-badge.kind-non_chat,.seg-badge.kind-unknown,.seg-badge.kind-too_short{
  background:var(--warn-soft); color:var(--warn)}
.seg-count{font-size:11px; color:var(--ink-400); white-space:nowrap}
.seg-remark-row{display:flex; align-items:center; gap:6px; --isz:12px; color:var(--ink-400)}
.seg-remark{font-size:11.5px; color:var(--ink-600); background:transparent; border:0; outline:none;
  flex:1; min-width:0}
.seg-remark::placeholder{color:var(--ink-400)}
.seg-frames{display:flex; flex-wrap:wrap; gap:8px}
.mini-frame{width:94px; height:138px; border-radius:8px; border:1px solid var(--border-strong);
  overflow:hidden; background:#fff; position:relative; cursor:zoom-in}
.mini-frame img{display:block; width:100%; height:100%; object-fit:cover; object-position:top}
.mini-frame .mf-ov{position:absolute; left:0; right:0; bottom:0; background:rgba(0,0,0,.55);
  color:#fff; font-size:9px; padding:1px 4px}
.seg-warn{display:flex; align-items:center; gap:6px; font-size:11px; color:var(--warn); --isz:12px}

.footer{flex:0 0 auto; border-top:1px solid var(--border); padding:16px; display:flex;
  flex-direction:column; gap:9px; background:var(--surface)}
.select-row{display:flex; align-items:center; justify-content:space-between}
.checkbox{display:inline-flex; align-items:center; gap:8px; cursor:pointer; font-size:13px;
  font-weight:500; color:var(--ink-900); user-select:none}
.cb{width:18px; height:18px; border-radius:5px; border:1.5px solid var(--border-strong);
  background:#fff; display:flex; align-items:center; justify-content:center; --isz:12px; color:#fff}
.checkbox.checked .cb,.seg.checked .cb{background:var(--accent); border-color:var(--accent)}
.checkbox.checked .cb::after,.seg.checked .cb::after{content:"✓"; font-size:12px; line-height:1}
.sel-summary{font-size:12.5px; font-weight:600; color:var(--accent)}
.cta-row{display:flex; gap:9px}
.cta{flex:1; height:44px; border-radius:9px; display:flex; align-items:center; justify-content:center;
  gap:7px; font-size:14px; font-weight:600; cursor:pointer; border:0; --isz:16px}
.cta-primary{background:var(--accent); color:#fff}
.cta-primary:hover{background:var(--primary-hover)}
.cta-ghost{background:var(--surface); color:var(--ink-900); border:1px solid var(--border-strong)}
.cta-ghost:hover{background:var(--surface-2)}
.cta:disabled{opacity:.45; cursor:default}

/* ============ Busy overlay ============ */
#busy{position:fixed; inset:0; background:rgba(30,30,45,.45); z-index:60;
  display:flex; align-items:center; justify-content:center}
#busy[hidden]{display:none}
.busy-card{width:360px; background:#fff; border-radius:14px; padding:30px 32px; text-align:center;
  box-shadow:0 20px 60px rgba(20,25,40,.3)}
.busy-spin{width:34px; height:34px; margin:0 auto 16px; border-radius:50%;
  border:3px solid var(--accent-soft); border-top-color:var(--accent); animation:spin .8s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.busy-title{font-size:15px; font-weight:600; color:var(--ink-900)}
.busy-msg{margin-top:6px; font-size:12px; color:var(--ink-400); line-height:1.5}
.busy-bar{margin-top:16px; height:5px; border-radius:3px; background:var(--surface-2); overflow:hidden}
.busy-bar-fill{height:100%; width:0; background:var(--accent); border-radius:3px; transition:width .25s}

/* ============ Lightbox ============ */
#lightbox{position:fixed; inset:0; z-index:80; background:rgba(18,18,28,.86);
  display:flex; align-items:center; justify-content:center; gap:18px; padding:32px;
  -webkit-backdrop-filter:blur(2px); backdrop-filter:blur(2px)}
#lightbox[hidden]{display:none}
.lb-stage{flex:0 1 auto; min-width:0; display:flex; flex-direction:column; align-items:center; gap:12px}
.lb-stage img{max-width:min(86vw, 460px); max-height:84vh; width:auto; height:auto; display:block;
  border-radius:10px; box-shadow:0 18px 60px rgba(0,0,0,.5); background:#000}
.lb-caption{display:flex; align-items:baseline; gap:10px; color:#fff; font-size:13px}
.lb-caption .lb-count{color:rgba(255,255,255,.6); font-size:12px}
.lb-nav{flex:none; width:46px; height:46px; border-radius:50%; border:0; cursor:pointer;
  background:rgba(255,255,255,.12); color:#fff; --isz:24px;
  display:flex; align-items:center; justify-content:center; transition:background .15s}
.lb-nav:hover{background:rgba(255,255,255,.24)}
.lb-nav:disabled{opacity:.25; cursor:default}
.lb-close{position:absolute; top:18px; right:18px; width:38px; height:38px; border-radius:50%; border:0;
  cursor:pointer; background:rgba(255,255,255,.12); color:#fff; --isz:20px;
  display:flex; align-items:center; justify-content:center; transition:background .15s}
.lb-close:hover{background:rgba(255,255,255,.24)}

.hidden{display:none!important}