/* ============================================================
   0. 设计令牌
   ============================================================ */
:root{
  --panel:rgba(9,19,32,.78);
  --panel-solid:#0a1421;
  --line:rgba(0,229,255,.16);
  --line-strong:rgba(0,229,255,.42);

  --cyan:#00e5ff;
  --cyan-soft:#7bf1ff;
  --teal:#1de9b6;
  --amber:#ffb020;
  --red:#ff3d5e;
  --violet:#8b6cff;

  --text:#d9e9f5;
  --text-dim:#8ba8bd;
  --text-mute:#5b7387;

  --glow-cyan:0 0 12px rgba(0,229,255,.45);
  --glow-red:0 0 12px rgba(255,61,94,.5);

  --r-sm:3px;
  --r-md:6px;

  --mono:ui-monospace,Consolas,"Liberation Mono",Menlo,monospace;
  --sans:"PingFang SC","Microsoft YaHei","Segoe UI",system-ui,sans-serif;

  --header-h:62px;
  --footer-h:30px;
  --side-w:290px;
}

*{margin:0;padding:0;box-sizing:border-box}
html,body{height:100%}
body{font-family:var(--sans);color:var(--text);background:#03060c;overflow:hidden;-webkit-font-smoothing:antialiased}

/* 背景层 */
.bg-layer{position:fixed;inset:0;z-index:0;pointer-events:none}
.bg-layer::before{
  content:'';position:absolute;inset:0;
  background:
    radial-gradient(1200px 700px at 18% -10%, rgba(0,229,255,.13), transparent 60%),
    radial-gradient(900px 600px at 100% 110%, rgba(139,108,255,.11), transparent 60%),
    linear-gradient(180deg,#04080f 0%,#03060c 50%,#04080f 100%);
}
.bg-grid{
  position:absolute;inset:-50%;
  background-image:
    linear-gradient(rgba(0,229,255,.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,229,255,.055) 1px, transparent 1px);
  background-size:46px 46px;
  transform:perspective(620px) rotateX(58deg);
  transform-origin:50% 0;
  animation:gridDrift 26s linear infinite;
  opacity:.55;
  -webkit-mask-image:linear-gradient(180deg, rgba(0,0,0,.9), transparent 62%);
          mask-image:linear-gradient(180deg, rgba(0,0,0,.9), transparent 62%);
}
@keyframes gridDrift{from{background-position:0 0}to{background-position:0 460px}}
.bg-scan{
  position:absolute;left:0;right:0;height:180px;
  background:linear-gradient(180deg, transparent, rgba(0,229,255,.055) 45%, rgba(0,229,255,.10) 50%, transparent);
  animation:scanSweep 9s cubic-bezier(.5,0,.5,1) infinite;
}
@keyframes scanSweep{0%{top:-20%}100%{top:120%}}
.bg-vignette{position:absolute;inset:0;box-shadow:inset 0 0 220px 60px rgba(0,0,0,.85)}

::-webkit-scrollbar{width:7px;height:7px}
::-webkit-scrollbar-track{background:rgba(255,255,255,.03)}
::-webkit-scrollbar-thumb{background:rgba(0,229,255,.22);border-radius:4px}
::-webkit-scrollbar-thumb:hover{background:rgba(0,229,255,.42)}

/* ============================================================
   1. 骨架
   ============================================================ */
.app{position:relative;z-index:1;height:100vh;display:flex;flex-direction:column}

.header{
  height:var(--header-h);flex:0 0 auto;
  display:flex;align-items:center;gap:18px;padding:0 18px;
  background:linear-gradient(180deg, rgba(8,20,34,.95), rgba(6,14,24,.72));
  border-bottom:1px solid var(--line);
  box-shadow:0 1px 0 rgba(0,229,255,.08), 0 8px 30px -12px rgba(0,0,0,.9);
  position:relative;
}
.header::after{
  content:'';position:absolute;left:0;right:0;bottom:-1px;height:1px;
  background:linear-gradient(90deg, transparent, var(--cyan), transparent);opacity:.55;
}
.brand{display:flex;align-items:center;gap:11px;min-width:0}
.brand__mark{width:34px;height:34px;flex:0 0 auto;position:relative}
.brand__mark svg{width:100%;height:100%;filter:drop-shadow(0 0 6px rgba(0,229,255,.6))}
.brand__mark::after{
  content:'';position:absolute;inset:0;border-radius:50%;
  border:1px solid rgba(0,229,255,.3);animation:radarPulse 2.6s ease-out infinite;
}
@keyframes radarPulse{0%{transform:scale(.82);opacity:.9}100%{transform:scale(1.35);opacity:0}}
.brand__title{
  font-size:16px;font-weight:700;letter-spacing:2.5px;line-height:1.15;white-space:nowrap;
  background:linear-gradient(90deg,#fff,var(--cyan-soft) 60%,var(--teal));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.brand__sub{font-family:var(--mono);font-size:9px;letter-spacing:2.2px;color:var(--text-mute);white-space:nowrap}

.hdr-stats{display:flex;gap:9px;margin-left:6px;flex:1 1 auto;min-width:0;overflow:hidden}
.stat{
  display:flex;align-items:center;gap:8px;padding:6px 12px;white-space:nowrap;
  background:rgba(0,229,255,.045);border:1px solid var(--line);border-radius:var(--r-sm);position:relative;
}
.stat::before{
  content:'';position:absolute;left:-1px;top:-1px;width:8px;height:8px;
  border-left:1px solid var(--cyan);border-top:1px solid var(--cyan);opacity:.7;
}
.stat__ico{width:15px;height:15px;opacity:.85;flex:0 0 auto}
.stat__body{display:flex;flex-direction:column;line-height:1.15}
.stat__k{font-size:9px;letter-spacing:1.2px;color:var(--text-mute);font-family:var(--mono)}
.stat__v{font-family:var(--mono);font-size:15px;font-weight:700;letter-spacing:.5px}
.stat--ok .stat__v{color:var(--teal)}
.stat--warn .stat__v{color:var(--amber)}
.stat--err .stat__v{color:var(--red)}
.stat--info .stat__v{color:var(--cyan)}

.hdr-clock{display:flex;flex-direction:column;align-items:flex-end;line-height:1.1;flex:0 0 auto}
.hdr-clock__t{font-family:var(--mono);font-size:19px;font-weight:700;color:var(--cyan-soft);letter-spacing:1px;text-shadow:var(--glow-cyan)}
.hdr-clock__d{font-family:var(--mono);font-size:9.5px;color:var(--text-mute);letter-spacing:1.1px}

.hdr-actions{display:flex;gap:7px;flex:0 0 auto}
.btn{
  height:30px;padding:0 12px;display:inline-flex;align-items:center;gap:6px;
  background:rgba(0,229,255,.06);border:1px solid var(--line);color:var(--text-dim);
  border-radius:var(--r-sm);cursor:pointer;font-size:12px;font-family:var(--sans);
  transition:all .16s ease;white-space:nowrap;user-select:none;
}
.btn svg{width:14px;height:14px}
.btn:hover{border-color:var(--line-strong);color:var(--cyan-soft);background:rgba(0,229,255,.13);box-shadow:var(--glow-cyan)}
.btn:active{transform:translateY(1px)}
.btn.is-active{border-color:var(--cyan);color:#001318;background:var(--cyan);box-shadow:var(--glow-cyan);font-weight:600}
.btn[disabled]{opacity:.55;cursor:not-allowed}
.btn--icon{width:30px;padding:0;justify-content:center}
.btn--danger:hover{border-color:var(--red);color:#fff;background:rgba(255,61,94,.2);box-shadow:var(--glow-red)}

.body{flex:1 1 auto;display:flex;min-height:0}
.wall-wrap{flex:1 1 auto;min-width:0;display:flex;flex-direction:column;padding:12px;gap:12px}

/* ============================================================
   2. 视频墙
   ============================================================ */
.wall{flex:1 1 auto;min-height:0;display:grid;gap:11px;grid-template-columns:repeat(3,1fr);grid-template-rows:repeat(3,1fr)}
.wall[data-layout="4"]{grid-template-columns:repeat(2,1fr);grid-template-rows:repeat(2,1fr)}
.wall[data-layout="focus"]{grid-template-columns:3fr 1fr;grid-template-rows:repeat(4,1fr)}

.cam{
  position:relative;min-width:0;min-height:0;background:#04080e;
  border:1px solid var(--line);border-radius:var(--r-md);overflow:hidden;
  display:flex;flex-direction:column;transition:border-color .2s ease, box-shadow .2s ease;
}
.wall[data-layout="focus"] .cam{grid-column:2;grid-row:span 1}
.wall[data-layout="focus"] .cam.is-focus{grid-column:1;grid-row:1 / span 4}
.wall[data-layout="4"] .cam:nth-child(n+5){display:none}

.cam:hover{border-color:var(--line-strong);box-shadow:0 0 0 1px rgba(0,229,255,.12), 0 10px 34px -14px rgba(0,229,255,.4)}
.cam.is-focus{border-color:var(--cyan);box-shadow:0 0 0 1px rgba(0,229,255,.3), 0 0 40px -10px rgba(0,229,255,.45)}
.cam.is-alarm{border-color:var(--red);box-shadow:0 0 0 1px rgba(255,61,94,.35), 0 0 32px -8px rgba(255,61,94,.55)}
.cam.is-idle .cam__stage{background:repeating-linear-gradient(135deg, rgba(255,255,255,.014) 0 9px, transparent 9px 18px), #04080e}

.cam__stage{position:relative;flex:1 1 auto;min-height:0;background:#02060b;overflow:hidden;cursor:pointer}
.cam__video{position:absolute;inset:0}
.cam__video > div,.cam__video video,.cam__video canvas{width:100%!important;height:100%!important;display:block}
.cam__video video,.cam__video canvas{object-fit:contain;background:#02060b}

.cam__hud{position:absolute;inset:0;pointer-events:none;z-index:3}
.corner{position:absolute;width:15px;height:15px;border:1px solid rgba(0,229,255,.5)}
.corner--tl{top:6px;left:6px;border-right:0;border-bottom:0}
.corner--tr{top:6px;right:6px;border-left:0;border-bottom:0}
.corner--bl{bottom:6px;left:6px;border-right:0;border-top:0}
.corner--br{bottom:6px;right:6px;border-left:0;border-top:0}

.hud-top{
  position:absolute;top:0;left:0;right:0;display:flex;align-items:center;gap:8px;padding:9px 12px 22px;
  background:linear-gradient(180deg, rgba(2,8,14,.88), transparent);
}
.hud-name{
  font-size:12.5px;font-weight:600;letter-spacing:.6px;color:#eaf7ff;text-shadow:0 1px 6px rgba(0,0,0,.9);
  overflow:hidden;text-overflow:ellipsis;white-space:nowrap;
}
.hud-sn{font-family:var(--mono);font-size:9.5px;color:var(--text-dim);letter-spacing:.6px;flex:0 0 auto}
.hud-chips{display:flex;gap:5px;margin-left:auto;flex:0 0 auto}
.chip{
  font-family:var(--mono);font-size:9px;font-weight:700;letter-spacing:.7px;padding:2.5px 6px;
  border-radius:2px;border:1px solid currentColor;background:rgba(0,0,0,.5);white-space:nowrap;
}
.chip--h264{color:var(--teal)}
.chip--h265{color:var(--violet)}
.chip--na{color:var(--text-mute)}
.chip--hd{color:var(--amber)}

.hud-bot{
  position:absolute;bottom:0;left:0;right:0;display:flex;align-items:flex-end;gap:10px;padding:20px 12px 8px;
  background:linear-gradient(0deg, rgba(2,8,14,.9), transparent);
}
.hud-meta{font-family:var(--mono);font-size:9.5px;color:var(--text-dim);letter-spacing:.5px;line-height:1.55}
.hud-meta b{color:var(--cyan-soft);font-weight:600}
.hud-rec{
  margin-left:auto;display:flex;align-items:center;gap:5px;flex:0 0 auto;
  font-family:var(--mono);font-size:9.5px;font-weight:700;letter-spacing:1.2px;color:var(--red);
}
.hud-rec i{width:6px;height:6px;border-radius:50%;background:var(--red);box-shadow:var(--glow-red);animation:blink 1.4s steps(1) infinite}
@keyframes blink{0%,49%{opacity:1}50%,100%{opacity:.15}}

.crosshair{position:absolute;top:50%;left:50%;width:26px;height:26px;transform:translate(-50%,-50%);opacity:.16}
.crosshair::before,.crosshair::after{content:'';position:absolute;background:var(--cyan)}
.crosshair::before{left:50%;top:0;bottom:0;width:1px;transform:translateX(-50%)}
.crosshair::after{top:50%;left:0;right:0;height:1px;transform:translateY(-50%)}

.cam__mask{
  position:absolute;inset:0;z-index:5;display:none;flex-direction:column;
  align-items:center;justify-content:center;gap:12px;text-align:center;padding:16px;
  background:radial-gradient(420px 260px at 50% 50%, rgba(0,40,60,.5), rgba(2,6,11,.94));
}
.cam__mask.is-show{display:flex}
.mask-title{font-family:var(--mono);font-size:11px;letter-spacing:1.6px;color:var(--cyan-soft)}
.mask-sub{font-size:10.5px;color:var(--text-mute);letter-spacing:.4px;max-width:280px;line-height:1.6}
.mask-err-title{color:var(--red);letter-spacing:1.4px}

.radar{width:74px;height:74px;position:relative}
.radar::before{content:'';position:absolute;inset:0;border-radius:50%;border:1px solid rgba(0,229,255,.22)}
.radar::after{
  content:'';position:absolute;inset:0;border-radius:50%;
  background:conic-gradient(from 0deg, rgba(0,229,255,.45), transparent 68%);
  animation:radarSpin 1.5s linear infinite;
}
@keyframes radarSpin{to{transform:rotate(360deg)}}
.radar i{
  position:absolute;left:50%;top:50%;width:34%;height:34%;transform:translate(-50%,-50%);
  border-radius:50%;border:1px solid rgba(0,229,255,.35);animation:radarPing 1.9s ease-out infinite;
}
@keyframes radarPing{0%{transform:translate(-50%,-50%) scale(.3);opacity:1}100%{transform:translate(-50%,-50%) scale(2.6);opacity:0}}

.cam__bar{
  flex:0 0 auto;height:34px;display:flex;align-items:center;gap:4px;padding:0 7px;
  background:linear-gradient(180deg, rgba(10,22,36,.9), rgba(6,14,24,.95));border-top:1px solid var(--line);
}
.cam__dot{width:7px;height:7px;border-radius:50%;flex:0 0 auto;background:var(--text-mute);margin-right:3px}
.cam__dot[data-s="loading"]{background:var(--amber);animation:blink 1s steps(1) infinite}
.cam__dot[data-s="playing"]{background:var(--teal);box-shadow:0 0 8px rgba(29,233,182,.8)}
.cam__dot[data-s="error"]{background:var(--red);box-shadow:var(--glow-red)}
.cam__idx{font-family:var(--mono);font-size:10px;color:var(--text-mute);letter-spacing:1px;margin-right:auto;padding-left:2px}
.cam__btn{
  width:24px;height:24px;display:inline-flex;align-items:center;justify-content:center;
  border:1px solid transparent;border-radius:2px;background:transparent;cursor:pointer;
  color:var(--text-mute);transition:all .15s ease;
}
.cam__btn svg{width:13px;height:13px}
.cam__btn:hover{color:var(--cyan);border-color:var(--line-strong);background:rgba(0,229,255,.1)}
.cam__btn.is-on{color:var(--amber);border-color:rgba(255,176,32,.4);background:rgba(255,176,32,.12)}

/* ============================================================
   3. 侧栏
   ============================================================ */
.sidebar{
  flex:0 0 var(--side-w);width:var(--side-w);
  display:flex;flex-direction:column;gap:11px;padding:12px 12px 12px 0;min-height:0;
}
.sidebar.is-hidden{display:none}
.panel{
  background:var(--panel);border:1px solid var(--line);border-radius:var(--r-md);
  backdrop-filter:blur(8px);display:flex;flex-direction:column;
  min-height:0;position:relative;overflow:hidden;
}
.panel::before{
  content:'';position:absolute;top:0;left:0;right:0;height:1px;
  background:linear-gradient(90deg, transparent, rgba(0,229,255,.5), transparent);
}
.panel__hd{
  flex:0 0 auto;height:30px;display:flex;align-items:center;gap:7px;padding:0 10px;
  border-bottom:1px solid var(--line);background:linear-gradient(180deg, rgba(0,229,255,.07), transparent);
}
.panel__hd h3{font-size:11.5px;font-weight:600;letter-spacing:1.4px;color:var(--cyan-soft)}
.panel__hd .tag{
  margin-left:auto;font-family:var(--mono);font-size:9px;color:var(--text-mute);
  letter-spacing:.8px;padding:1px 5px;border:1px solid var(--line);border-radius:2px;
}
.panel__bd{padding:10px;min-height:0;overflow:auto;flex:1 1 auto}

.gauge{display:flex;align-items:center;gap:14px}
.gauge__ring{position:relative;width:88px;height:88px;flex:0 0 auto}
.gauge__ring svg{transform:rotate(-90deg)}
.gauge__ring .trk{fill:none;stroke:rgba(0,229,255,.1);stroke-width:7}
.gauge__ring .val{fill:none;stroke:url(#gg);stroke-width:7;stroke-linecap:round;transition:stroke-dashoffset .6s ease}
.gauge__num{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center}
.gauge__num b{font-family:var(--mono);font-size:21px;color:var(--cyan-soft);line-height:1;text-shadow:var(--glow-cyan)}
.gauge__num span{font-size:9px;color:var(--text-mute);letter-spacing:1px;margin-top:2px}
.gauge__list{flex:1 1 auto;display:flex;flex-direction:column;gap:6px;min-width:0}
.gauge__row{display:flex;align-items:center;gap:7px;font-size:11px;color:var(--text-dim)}
.gauge__row i{width:7px;height:7px;border-radius:1px;flex:0 0 auto}
.gauge__row b{margin-left:auto;font-family:var(--mono);color:var(--text);font-size:12px}

.devlist{display:flex;flex-direction:column;gap:4px}
.dev{
  display:flex;align-items:center;gap:8px;padding:6px 8px;border-radius:3px;
  border:1px solid transparent;cursor:pointer;transition:all .15s ease;
}
.dev:hover{background:rgba(0,229,255,.07);border-color:var(--line)}
.dev.is-sel{background:rgba(0,229,255,.12);border-color:var(--line-strong)}
.dev__i{
  width:19px;height:19px;flex:0 0 auto;border-radius:2px;display:flex;align-items:center;justify-content:center;
  font-family:var(--mono);font-size:9.5px;font-weight:700;
  background:rgba(0,229,255,.12);color:var(--cyan-soft);border:1px solid var(--line);
}
.dev__t{min-width:0;flex:1 1 auto}
.dev__n{font-size:11.5px;color:var(--text);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.dev__s{font-family:var(--mono);font-size:9px;color:var(--text-mute);letter-spacing:.4px}
.dev__st{width:6px;height:6px;border-radius:50%;flex:0 0 auto}
.dev__st[data-s="playing"]{background:var(--teal);box-shadow:0 0 7px rgba(29,233,182,.9)}
.dev__st[data-s="loading"]{background:var(--amber)}
.dev__st[data-s="error"]{background:var(--red);box-shadow:var(--glow-red)}
.dev__st[data-s="idle"]{background:var(--text-mute)}

.logs{display:flex;flex-direction:column;gap:3px;font-family:var(--mono);font-size:10px;line-height:1.5}
.log{display:flex;gap:6px;padding:2px 0;animation:logIn .25s ease}
@keyframes logIn{from{opacity:0;transform:translateX(-6px)}to{opacity:1;transform:none}}
.log time{color:var(--text-mute);flex:0 0 auto}
.log p{color:var(--text-dim);word-break:break-all}
.log[data-lv="ok"] p{color:var(--teal)}
.log[data-lv="warn"] p{color:var(--amber)}
.log[data-lv="err"] p{color:var(--red)}
.log[data-lv="info"] p{color:var(--cyan-soft)}

/* ---------- Footer ---------- */
.footer{
  height:var(--footer-h);flex:0 0 auto;display:flex;align-items:center;gap:12px;padding:0 14px;
  border-top:1px solid var(--line);background:linear-gradient(0deg, rgba(8,20,34,.95), rgba(6,14,24,.7));
  font-family:var(--mono);font-size:10px;color:var(--text-mute);letter-spacing:.6px;overflow:hidden;
}
.ft-live{display:flex;align-items:center;gap:6px;color:var(--teal);flex:0 0 auto}
.ft-live i{width:6px;height:6px;border-radius:50%;background:var(--teal);box-shadow:0 0 8px rgba(29,233,182,.9);animation:blink 1.6s steps(1) infinite}
.ft-tick{flex:1 1 auto;overflow:hidden;white-space:nowrap;text-overflow:ellipsis;color:var(--text-dim)}
.ft-r{display:flex;gap:12px;flex:0 0 auto}

/* ============================================================
   4. 启动闸门 / 弹窗
   ============================================================ */
.gate{
  position:fixed;inset:0;z-index:200;display:flex;align-items:center;justify-content:center;padding:24px;
  background:radial-gradient(900px 600px at 50% 30%, rgba(0,60,90,.32), rgba(2,5,10,.97));
  backdrop-filter:blur(6px);
}
.gate.is-hide{display:none}
.gate__box{
  width:min(660px,100%);background:var(--panel-solid);border:1px solid var(--line-strong);
  border-radius:8px;overflow:hidden;box-shadow:0 30px 90px -20px rgba(0,0,0,.95), 0 0 60px -20px rgba(0,229,255,.25);
}
.gate__hd{
  padding:18px 22px;border-bottom:1px solid var(--line);
  background:linear-gradient(90deg, rgba(0,229,255,.12), transparent);display:flex;align-items:center;gap:12px;
}
.gate__hd svg{width:26px;height:26px;filter:drop-shadow(0 0 8px rgba(0,229,255,.7))}
.gate__hd h2{font-size:16px;font-weight:700;letter-spacing:2px;color:var(--cyan-soft)}
.gate__hd p{font-family:var(--mono);font-size:9.5px;color:var(--text-mute);letter-spacing:1.4px;margin-top:2px}
.gate__bd{padding:20px 22px;max-height:66vh;overflow:auto}
.gate__ft{padding:14px 22px;border-top:1px solid var(--line);display:flex;gap:9px;justify-content:flex-end;background:rgba(0,0,0,.25)}

.field{margin-bottom:14px}
.field label{display:block;font-size:11px;color:var(--text-dim);letter-spacing:.8px;margin-bottom:6px}
.field label em{color:var(--red);font-style:normal;margin-left:3px}
.field input,.field select{
  width:100%;height:36px;padding:0 11px;background:rgba(0,0,0,.42);
  border:1px solid var(--line);border-radius:var(--r-sm);color:var(--text);
  font-family:var(--mono);font-size:12px;outline:none;transition:all .16s ease;
}
.field input:focus,.field select:focus{border-color:var(--cyan);box-shadow:0 0 0 2px rgba(0,229,255,.14)}
.field input::placeholder{color:var(--text-mute)}
.field .hint{font-size:10px;color:var(--text-mute);margin-top:5px;line-height:1.7}
.field .hint code,.help-sec code{
  font-family:var(--mono);font-size:10px;background:rgba(0,229,255,.1);
  color:var(--cyan-soft);padding:1px 5px;border-radius:2px;border:1px solid var(--line);word-break:break-all;
}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:12px}

.notice{
  display:flex;gap:9px;padding:10px 12px;border-radius:var(--r-sm);
  background:rgba(255,176,32,.07);border:1px solid rgba(255,176,32,.25);
  font-size:10.5px;color:#e6cfa4;line-height:1.65;
}
.notice svg{width:15px;height:15px;flex:0 0 auto;color:var(--amber);margin-top:1px}
.notice--info{background:rgba(0,229,255,.06);border-color:rgba(0,229,255,.22);color:#a8dcec}
.notice--info svg{color:var(--cyan)}
.notice b{color:#fff}

.cams-preview{display:grid;grid-template-columns:repeat(3,1fr);gap:5px;margin-top:8px}
.cams-preview span{
  font-family:var(--mono);font-size:9.5px;padding:4px 6px;border-radius:2px;text-align:center;
  background:rgba(0,229,255,.06);border:1px solid var(--line);color:var(--text-dim);
  overflow:hidden;text-overflow:ellipsis;white-space:nowrap;
}

.modal{
  position:fixed;inset:0;z-index:210;display:none;align-items:center;justify-content:center;padding:24px;
  background:rgba(2,5,10,.82);backdrop-filter:blur(4px);
}
.modal.is-show{display:flex}
.modal__box{
  width:min(600px,100%);max-height:88vh;overflow:auto;background:var(--panel-solid);
  border:1px solid var(--line-strong);border-radius:8px;box-shadow:0 30px 90px -20px #000;
}
.modal__hd{
  padding:15px 20px;border-bottom:1px solid var(--line);display:flex;align-items:center;gap:10px;
  background:linear-gradient(90deg, rgba(0,229,255,.1), transparent);
}
.modal__hd h3{font-size:14px;letter-spacing:1.4px;color:var(--cyan-soft);font-weight:600}
.modal__hd .x{
  margin-left:auto;width:26px;height:26px;display:flex;align-items:center;justify-content:center;
  border-radius:3px;cursor:pointer;color:var(--text-mute);border:1px solid transparent;
}
.modal__hd .x:hover{color:var(--red);border-color:rgba(255,61,94,.4);background:rgba(255,61,94,.1)}
.modal__bd{padding:18px 20px}
.modal__ft{padding:12px 20px;border-top:1px solid var(--line);display:flex;gap:9px;justify-content:flex-end;background:rgba(0,0,0,.25)}

.help-sec{margin-bottom:16px}
.help-sec h4{
  font-size:12px;color:var(--cyan);letter-spacing:1px;margin-bottom:7px;display:flex;align-items:center;gap:6px;
}
.help-sec h4::before{content:'';width:6px;height:6px;background:var(--cyan);border-radius:50%;box-shadow:var(--glow-cyan)}
.help-sec p,.help-sec li{font-size:11.5px;color:var(--text-dim);line-height:1.85}
.help-sec ul{padding-left:16px}

/* Toast */
.toasts{position:fixed;top:74px;right:16px;z-index:300;display:flex;flex-direction:column;gap:8px;pointer-events:none}
.toast{
  min-width:210px;max-width:340px;padding:9px 13px;border-radius:var(--r-sm);
  background:rgba(10,22,36,.96);border:1px solid var(--line-strong);border-left:3px solid var(--cyan);
  box-shadow:0 12px 34px -12px rgba(0,0,0,.95);font-size:11.5px;color:var(--text);line-height:1.55;
  animation:toastIn .26s cubic-bezier(.2,.9,.3,1.2);
}
@keyframes toastIn{from{opacity:0;transform:translateX(30px)}to{opacity:1;transform:none}}
.toast[data-t="ok"]{border-left-color:var(--teal)}
.toast[data-t="err"]{border-left-color:var(--red)}
.toast[data-t="warn"]{border-left-color:var(--amber)}
.toast.is-out{animation:toastOut .22s ease forwards}
@keyframes toastOut{to{opacity:0;transform:translateX(30px)}}

/* 响应式 */
@media (max-width:1500px){
  :root{--side-w:250px}
  .hdr-stats .stat:nth-child(n+4){display:none}
}
@media (max-width:1180px){
  .sidebar{display:none}
  .hdr-stats{display:none}
}
@media (max-width:820px){
  .wall{grid-template-columns:repeat(2,1fr);grid-template-rows:repeat(5,1fr)}
  .wall[data-layout="focus"]{grid-template-columns:1fr;grid-template-rows:2fr repeat(4,1fr)}
  .wall[data-layout="focus"] .cam{grid-column:1}
  .wall[data-layout="focus"] .cam.is-focus{grid-row:1}
  .brand__sub{display:none}
}

/* ============================================================
   5. 性能模式
   9 路并发时，全屏背景动画、backdrop-filter 毛玻璃、box-shadow
   会持续触发大面积合成重绘，与 9 路视频解码抢 GPU / CPU。
   开启后关闭这些装饰性开销，把资源全部让给解码。
   ============================================================ */
body.perf-mode .bg-grid,
body.perf-mode .bg-scan,
body.perf-mode .crosshair,
body.perf-mode .brand__mark::after{display:none!important}

body.perf-mode .panel{backdrop-filter:none;-webkit-backdrop-filter:none;background:rgba(9,19,32,.95)}
body.perf-mode .panel::before{display:none}

body.perf-mode .cam,
body.perf-mode .cam:hover,
body.perf-mode .cam.is-focus{box-shadow:none!important}
/* 隔离每个格子的重绘范围，避免 9 路之间互相触发大面积合成 */
body.perf-mode .cam{contain:layout paint}

body.perf-mode .log{animation:none}
body.perf-mode .toast{animation:none}
body.perf-mode .hdr-clock__t{text-shadow:none}
body.perf-mode .gauge__num b{text-shadow:none}
body.perf-mode .stat::before{display:none}
body.perf-mode .cam__dot{box-shadow:none!important}
body.perf-mode .hud-rec i{box-shadow:none!important;animation:none}