:root{
  --bg:#F7F5F2;--panel:#FFFFFF;--ink:#1F1B24;--mut:#8A8494;--line:#ECE8EF;--line2:#DCD6E0;
  --acc:#E2557A;--acc2:#FCE7EE;--ok:#16A34A;--warn:#D97706;
  --r:12px;--shadow:0 8px 30px rgba(40,20,50,.12),0 1px 3px rgba(40,20,50,.08);
  --sans:"PingFang SC","Noto Sans CJK SC","Microsoft YaHei",system-ui,sans-serif;
}
*{box-sizing:border-box}
html,body{margin:0;height:100%}
body{background:var(--bg);color:var(--ink);font:14px/1.5 var(--sans);-webkit-font-smoothing:antialiased}
button{font:inherit;color:inherit;cursor:pointer}
textarea,input{font:inherit;color:inherit}
a{color:inherit}

/* ---------- 顶栏 ---------- */
body.rv{display:flex;flex-direction:column;overflow:hidden}
#top{flex:none;display:flex;align-items:center;gap:10px;padding:8px 12px;background:var(--panel);border-bottom:1px solid var(--line);min-height:52px}
#top .home{font-weight:800;text-decoration:none;color:var(--acc);white-space:nowrap;letter-spacing:.04em}
#docSel{max-width:220px;border:1px solid var(--line2);background:#fff;border-radius:8px;padding:5px 8px}
#where{color:var(--mut);white-space:nowrap;font-variant-numeric:tabular-nums}
.sp{flex:1}
.tools{display:flex;align-items:center;gap:2px;background:var(--bg);border-radius:10px;padding:3px}
.tools button{border:none;background:none;border-radius:8px;padding:5px 9px;display:flex;align-items:center;gap:5px;white-space:nowrap;color:#4B4553}
.tools button svg{width:17px;height:17px;flex:none}
.tools button:hover{background:#fff}
.tools button.on{background:#fff;color:var(--acc);box-shadow:0 1px 3px rgba(0,0,0,.1)}
.tools .lbl{font-size:13px}
.colors{display:none;align-items:center;gap:5px;margin-left:4px}
body[data-tool=pen] .colors,body[data-tool=hl] .colors{display:flex}
.colors i{width:18px;height:18px;border-radius:50%;cursor:pointer;border:2px solid #fff;box-shadow:0 0 0 1px var(--line2)}
.colors i.on{box-shadow:0 0 0 2px var(--ink)}
#people{display:flex;align-items:center;gap:4px}
.av{width:28px;height:28px;border-radius:50%;color:#fff;font-weight:700;font-size:13px;display:flex;align-items:center;justify-content:center;border:2px solid #fff;box-shadow:0 0 0 1px var(--line2);cursor:pointer;position:relative;flex:none}
.av.follow{box-shadow:0 0 0 2px var(--acc)}
.av .loc{position:absolute;top:100%;left:50%;transform:translateX(-50%);font-size:10px;color:var(--mut);white-space:nowrap;font-weight:400;margin-top:1px}
.pill{border:1px solid var(--line2);background:#fff;border-radius:999px;padding:5px 12px;white-space:nowrap}
.pill:hover{border-color:var(--acc);color:var(--acc)}
.pill.on{background:var(--acc);color:#fff;border-color:var(--acc)}
#status{width:8px;height:8px;border-radius:50%;background:#C9C3CF;flex:none}
#status.ok{background:var(--ok)}
.menu{position:relative}
.menu .dd{position:absolute;right:0;top:calc(100% + 6px);background:#fff;border-radius:10px;box-shadow:var(--shadow);padding:6px;display:none;z-index:60;min-width:190px}
.menu.open .dd{display:block}
.dd a,.dd button{display:block;width:100%;text-align:left;border:none;background:none;padding:8px 10px;border-radius:7px;text-decoration:none}
.dd a:hover,.dd button:hover{background:var(--bg)}

/* ---------- 主区 ---------- */
#main{flex:1;min-height:0;display:flex}
#viewport{flex:1;min-width:0;position:relative;overflow:hidden;background:#E9E5EC}
#frameBox{position:absolute;left:0;top:0;transform-origin:0 0;background:#fff;box-shadow:0 4px 24px rgba(40,20,50,.15)}
#frameBox iframe{position:absolute;inset:0;width:100%;height:100%;border:0;background:#fff}
#layer{position:absolute;inset:0;z-index:2;touch-action:none;overflow:hidden}
body[data-tool=browse] #layer{pointer-events:none;touch-action:auto}
body[data-tool=box] #layer{cursor:crosshair}
body[data-tool=pen] #layer,body[data-tool=hl] #layer{cursor:crosshair}
body[data-tool=erase] #layer{cursor:cell}
#inkSvg{position:absolute;left:0;top:0;overflow:visible;pointer-events:none}
#inkSvg path.future{opacity:.22}
#marks{position:absolute;left:0;top:0;width:100%;pointer-events:none}
.box{position:absolute;border:2.5px solid;border-radius:6px;background:color-mix(in srgb,currentColor 7%,transparent)}
.box.future{border-style:dashed;opacity:.45}
.box.resolved{opacity:.28}
.box.sel{box-shadow:0 0 0 4px color-mix(in srgb,currentColor 25%,transparent);background:color-mix(in srgb,currentColor 12%,transparent)}
.box.pin{width:0;height:0;border:none;background:none}
.badge{position:absolute;left:-2px;top:-2px;transform:translate(-30%,-60%);pointer-events:auto;border:none;color:#fff;border-radius:999px;padding:3px 11px;font-size:19px;font-weight:700;display:flex;gap:6px;align-items:center;box-shadow:0 2px 8px rgba(0,0,0,.2);white-space:nowrap}
.box.pin .badge{transform:translate(-50%,-100%);border-radius:999px 999px 999px 4px}
.badge small{font-size:15px;font-weight:600;opacity:.95}
.draft{position:absolute;border:2.5px dashed var(--acc);border-radius:6px;background:rgba(226,85,122,.08);pointer-events:none}
.navbtn{position:absolute;bottom:14px;z-index:5;width:42px;height:42px;border-radius:50%;border:none;background:rgba(255,255,255,.92);box-shadow:var(--shadow);font-size:22px;display:flex;align-items:center;justify-content:center}
#prevBtn{left:14px}#nextBtn{left:64px}
#hint{position:absolute;right:14px;bottom:14px;z-index:5;background:rgba(31,27,36,.78);color:#fff;border-radius:999px;padding:6px 14px;font-size:12.5px;pointer-events:none;transition:opacity .3s}

/* ---------- 侧栏 ---------- */
#panel{width:380px;flex:none;background:var(--panel);border-left:1px solid var(--line);display:flex;flex-direction:column;min-height:0}
.tabs{display:flex;padding:8px 10px 0;gap:4px;border-bottom:1px solid var(--line);flex:none}
.tabs button{border:none;background:none;padding:8px 12px;border-bottom:2.5px solid transparent;color:var(--mut);font-weight:600}
.tabs button.on{color:var(--ink);border-color:var(--acc)}
.tabs .n{display:inline-block;min-width:18px;padding:0 5px;border-radius:9px;background:var(--bg);font-size:11.5px;margin-left:3px;text-align:center}
.tabs .n.hot{background:var(--acc);color:#fff}
#list{flex:1;min-height:0;overflow:auto;padding:12px}
.empty{color:var(--mut);text-align:center;padding:36px 16px;line-height:1.9}
.empty b{color:var(--ink)}
.card{border:1px solid var(--line);border-radius:var(--r);margin-bottom:12px;background:#fff;transition:box-shadow .2s,border-color .2s}
.card.sel{border-color:var(--acc);box-shadow:0 0 0 3px var(--acc2)}
.card.resolved{opacity:.6}
.card-h{display:flex;align-items:center;gap:6px;padding:9px 8px 6px 10px}
.card-h .sp{display:none}
.num{min-width:22px;height:22px;border-radius:11px;color:#fff;font-weight:700;font-size:12px;display:flex;align-items:center;justify-content:center;padding:0 6px;cursor:pointer}
.tag{font-size:12px;font-weight:700;padding:1px 8px;border-radius:999px;white-space:nowrap;flex:none}
.who{color:var(--mut);font-size:12px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;min-width:0;flex:1}
.ib{border:none;background:none;border-radius:6px;padding:3px 6px;color:var(--mut);font-size:12.5px;white-space:nowrap}
.ib:hover{background:var(--bg);color:var(--ink)}
.ib.done{color:var(--ok)}
.quote{margin:0 10px 6px;padding:5px 9px;border-left:3px solid var(--line2);color:#5E5866;font-size:12.5px;background:var(--bg);border-radius:0 6px 6px 0;max-height:4.6em;overflow:hidden}
.msgs{padding:0 10px}
.m{display:flex;gap:8px;padding:6px 0;align-items:flex-start}
.m .av{width:24px;height:24px;font-size:11px;box-shadow:none;border:none;cursor:default}
.m .bd{flex:1;min-width:0}
.m .meta{font-size:12px;color:var(--mut)}
.m .meta b{color:var(--ink);font-weight:600;margin-right:4px}
.m p{margin:1px 0 0;white-space:pre-wrap;word-break:break-word}
.m audio{height:34px;width:100%;max-width:260px;margin-top:3px}
.m .x{visibility:hidden}
.m:hover .x{visibility:visible}
.loc-chip{font-size:11px;background:var(--acc2);color:var(--acc);border-radius:5px;padding:0 5px;margin-left:4px;cursor:pointer;border:none}
.composer{display:flex;gap:6px;align-items:flex-end;padding:8px 10px 10px}
.composer textarea{flex:1;resize:none;border:1px solid var(--line2);border-radius:10px;padding:7px 10px;min-height:36px;max-height:140px;outline:none;background:#fff}
.composer textarea:focus{border-color:var(--acc)}
.send{border:none;background:var(--acc);color:#fff;border-radius:10px;padding:7px 13px;font-weight:600;white-space:nowrap}
.send:disabled{opacity:.4}
.mic{border:1px solid var(--line2);background:#fff;border-radius:10px;padding:6px 10px;white-space:nowrap;display:flex;align-items:center;gap:4px}
.mic.rec{background:#E11D48;color:#fff;border-color:#E11D48;animation:pulse 1.2s infinite}
.mic svg{width:16px;height:16px}
@keyframes pulse{50%{box-shadow:0 0 0 6px rgba(225,29,72,.18)}}
#chatBox{flex:none;border-top:1px solid var(--line);display:none}
body[data-tab=chat] #chatBox{display:block}
.grp{font-size:12px;color:var(--mut);font-weight:700;margin:14px 2px 6px;letter-spacing:.04em}
.grp:first-child{margin-top:0}
.row{display:flex;gap:8px;align-items:flex-start;padding:8px;border-radius:10px;cursor:pointer}
.row:hover{background:var(--bg)}
.row .txt{flex:1;min-width:0;color:#4B4553;font-size:13px;overflow:hidden;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical}
.row .cnt{color:var(--mut);font-size:12px;white-space:nowrap}

/* ---------- 新框选弹窗 ---------- */
#pop{position:fixed;z-index:50;width:330px;background:#fff;border-radius:14px;box-shadow:var(--shadow);padding:12px;display:none}
#pop.open{display:block}
#pop .tagrow{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:9px}
#pop .tagrow button{border:1.5px solid var(--line2);background:#fff;border-radius:999px;padding:3px 11px;font-size:13px;font-weight:600}
#pop .tagrow button.on{color:#fff}
#pop textarea{width:100%;resize:none;border:1px solid var(--line2);border-radius:10px;padding:8px 10px;min-height:64px;outline:none}
#pop textarea:focus{border-color:var(--acc)}
#pop .acts{display:flex;gap:6px;margin-top:9px;align-items:center}
#pop .cancel{border:none;background:none;color:var(--mut);padding:7px 8px}
#pop .tip{font-size:11.5px;color:var(--mut);margin-top:6px}

/* ---------- 弹框 / 提示 ---------- */
.modal{position:fixed;inset:0;background:rgba(31,27,36,.35);z-index:80;display:flex;align-items:center;justify-content:center;padding:16px}
.modal .in{background:#fff;border-radius:16px;box-shadow:var(--shadow);padding:22px;width:100%;max-width:400px}
.modal h3{margin:0 0 4px;font-size:18px}
.modal p{margin:0 0 14px;color:var(--mut)}
.modal input[type=text]{width:100%;border:1px solid var(--line2);border-radius:10px;padding:10px 12px;outline:none;font-size:15px}
.modal input:focus{border-color:var(--acc)}
.modal .cols{display:flex;gap:10px;margin:14px 0 18px}
.modal .cols i{width:30px;height:30px;border-radius:50%;cursor:pointer;border:3px solid #fff;box-shadow:0 0 0 1px var(--line2)}
.modal .cols i.on{box-shadow:0 0 0 2.5px var(--ink)}
.modal .row2{display:flex;gap:8px;justify-content:flex-end}
.btn{border:none;background:var(--acc);color:#fff;border-radius:10px;padding:9px 18px;font-weight:700}
.btn.ghost{background:var(--bg);color:var(--ink)}
#toasts{position:fixed;left:50%;bottom:20px;transform:translateX(-50%);z-index:90;display:flex;flex-direction:column;gap:8px;align-items:center;pointer-events:none}
.toast{background:rgba(31,27,36,.9);color:#fff;border-radius:12px;padding:8px 14px;max-width:min(90vw,420px);box-shadow:var(--shadow);font-size:13.5px;pointer-events:auto;cursor:pointer;animation:tin .25s}
@keyframes tin{from{opacity:0;transform:translateY(8px)}}

/* ---------- 手机 / 窄屏 ---------- */
@media (max-width:900px){
  body.rv{overflow:auto;height:auto;min-height:100%}
  #top{flex-wrap:wrap;gap:8px;position:sticky;top:0;z-index:40}
  #top .tools{order:5;width:100%;overflow-x:auto;justify-content:flex-start}
  .tools .lbl{display:none}
  .tools button{padding:7px 11px}
  #docSel{max-width:118px}
  #top .home,#status{display:none}
  .pill{padding:5px 10px}
  #main{flex-direction:column;flex:none}
  #viewport{flex:none;width:100%;aspect-ratio:var(--ar);max-height:72vh}
  body.scrolldoc #viewport{aspect-ratio:auto;height:66vh}
  #panel{width:100%;border-left:none;border-top:1px solid var(--line);min-height:60vh}
  #list{overflow:visible}
  #hint{display:none}
  #pop{left:8px!important;right:8px;bottom:8px;top:auto!important;width:auto}
  .navbtn,.wide{display:none}
}

/* ---------- 首页 ---------- */
body.home{min-height:100%}
.wrap{max-width:820px;margin:0 auto;padding:48px 20px 80px}
.hero h1{font-size:30px;margin:0 0 6px;letter-spacing:.02em}
.hero h1 span{color:var(--acc)}
.hero p{color:var(--mut);margin:0 0 28px;font-size:15px}
.feats{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:10px;margin-bottom:34px}
.feat{background:#fff;border-radius:var(--r);padding:12px 14px;border:1px solid var(--line)}
.feat b{display:block;margin-bottom:2px}
.feat span{color:var(--mut);font-size:13px}
.sec-t{font-size:13px;font-weight:700;color:var(--mut);letter-spacing:.08em;margin:0 0 10px}
.course{background:#fff;border-radius:16px;border:1px solid var(--line);padding:18px;margin-bottom:14px;display:flex;gap:14px;align-items:center;flex-wrap:wrap}
.course .t{flex:1;min-width:200px}
.course .t b{font-size:17px}
.course .t div{color:var(--mut);font-size:13px;margin-top:2px}
.recent a{display:flex;justify-content:space-between;gap:10px;padding:11px 14px;background:#fff;border:1px solid var(--line);border-radius:10px;margin-bottom:8px;text-decoration:none}
.recent a:hover{border-color:var(--acc)}
.recent span{color:var(--mut);font-size:12.5px;white-space:nowrap}