:root{
  --bg:#f5f6f8;
  --panel:#ffffff;
  --panel-2:#fafbfc;
  --border:#e3e6ea;
  --border-strong:#d0d5dc;
  --text:#1a1d21;
  --text-2:#5c6570;
  --text-3:#8b939d;
  --accent:#2563eb;
  --accent-soft:#e8efff;
  --green:#0f9d58;
  --orange:#e8710a;
  --red:#d93025;
  --purple:#7c3aed;
  --radius:12px;
  --shadow:0 1px 2px rgba(16,24,40,.04),0 4px 12px rgba(16,24,40,.05);
}

*{box-sizing:border-box;margin:0;padding:0}

body{
  font-family:"PingFang SC","Microsoft YaHei",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  background:var(--bg);
  color:var(--text);
  min-height:100vh;
  -webkit-font-smoothing:antialiased;
}

/* ---------- 顶栏 ---------- */
.topbar{
  display:flex;align-items:center;justify-content:space-between;
  padding:14px 24px;
  background:var(--panel);
  border-bottom:1px solid var(--border);
  position:sticky;top:0;z-index:20;
}
.brand{display:flex;align-items:center;gap:12px}
.logo{
  width:40px;height:40px;border-radius:11px;
  background:linear-gradient(135deg,#2563eb,#7c3aed);
  display:grid;place-items:center;font-size:20px;
  box-shadow:0 2px 8px rgba(37,99,235,.28);
}
.topbar h1{font-size:16px;font-weight:600;letter-spacing:.2px}
.sub{font-size:11.5px;color:var(--text-3);margin-top:1px}
.status-group{display:flex;gap:8px;align-items:center}
.badge{
  font-size:11.5px;font-weight:500;padding:5px 11px;border-radius:999px;
  border:1px solid var(--border-strong);color:var(--text-2);background:var(--panel-2);
  transition:all .2s;
}
.badge-idle{color:var(--text-3)}
.badge-loading{color:var(--orange);border-color:#f5d0a9;background:#fff7ee}
.badge-ok{color:var(--green);border-color:#b7e1c9;background:#eefaf3}
.badge-err{color:var(--red);border-color:#f3c2be;background:#fdefee}
.badge-fps{font-variant-numeric:tabular-nums;color:var(--text-2)}

/* ---------- 布局 ---------- */
.layout{
  display:grid;
  grid-template-columns:minmax(0,1fr) 380px;
  gap:20px;
  padding:20px 24px 32px;
  max-width:1440px;margin:0 auto;
  align-items:start;
}
@media(max-width:1080px){
  .layout{grid-template-columns:1fr;padding:16px}
}

/* ---------- 摄像头 ---------- */
.camera-panel{
  background:var(--panel);
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:16px;
  box-shadow:var(--shadow);
}
.video-wrap{
  position:relative;
  width:100%;
  aspect-ratio:4/3;
  background:#0e1116;
  border-radius:10px;
  overflow:hidden;
}
#video{
  position:absolute;inset:0;
  width:100%;height:100%;
  object-fit:cover;
  transform:scaleX(-1);      /* 镜像显示，符合直觉 */
  display:block;
}
#overlay{
  position:absolute;inset:0;
  width:100%;height:100%;
  /* 注意：这里刻意不做 CSS 镜像。镜像在 toCanvas() 里翻转 x 完成，
     否则画在 canvas 上的文字会左右颠倒。 */
  pointer-events:none;
}
.video-placeholder{
  position:absolute;inset:0;
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  gap:8px;color:#8b939d;text-align:center;padding:24px;
  transition:opacity .25s;
}
.video-placeholder .ph-icon{font-size:34px;opacity:.7}
.video-placeholder p{font-size:13.5px;color:#a8b0ba}
.video-placeholder small{font-size:11.5px;color:#6b7480;max-width:340px;line-height:1.6}
.video-placeholder.hide{opacity:0;pointer-events:none}
.handcount{
  position:absolute;top:10px;left:10px;
  font-size:11.5px;font-weight:500;
  padding:4px 10px;border-radius:999px;
  background:rgba(10,14,20,.62);
  color:#e8edf3;
  backdrop-filter:blur(6px);
}
.controls{
  display:flex;gap:10px;margin-top:14px;flex-wrap:wrap;
}
.btn{
  font-family:inherit;font-size:13px;font-weight:500;
  padding:10px 18px;border-radius:9px;border:1px solid transparent;
  cursor:pointer;transition:all .16s;letter-spacing:.2px;
}
.btn:disabled{opacity:.42;cursor:not-allowed}
.btn:not(:disabled):active{transform:translateY(1px)}
.btn-primary{background:var(--accent);color:#fff;box-shadow:0 1px 3px rgba(37,99,235,.3)}
.btn-primary:not(:disabled):hover{background:#1d4ed8}
.btn-record{background:var(--panel);color:var(--text);border-color:var(--border-strong)}
.btn-record:not(:disabled):hover{background:var(--accent-soft);border-color:var(--accent);color:var(--accent)}
.btn-record.recording{background:var(--green);color:#fff;border-color:var(--green)}
/* 小尺寸按钮：用于卡片标题行 */
.btn-sm{padding:5px 11px;font-size:11.5px;border-radius:7px}

/* ---------- 侧栏卡片 ---------- */
.side-panel{display:flex;flex-direction:column;gap:14px}
.card{
  background:var(--panel);
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:15px 16px;
  box-shadow:var(--shadow);
}
.card-head{
  display:flex;align-items:center;gap:10px;
  margin-bottom:12px;
}
.card-head h2{font-size:13px;font-weight:600;color:var(--text);letter-spacing:.2px}
/* 卡片头右侧的次要操作（如「清空」）自动靠右 */
.card-head .link-btn{margin-left:auto}
/* 目标列表 */
.link-btn{
  background:none;border:none;font-family:inherit;font-size:11.5px;
  color:var(--text-3);cursor:pointer;padding:2px 4px;border-radius:5px;
}
.link-btn:hover{color:var(--red);background:#fdefee}
.target-list{display:flex;flex-direction:column;gap:8px;max-height:260px;overflow-y:auto}
.empty-hint{font-size:11.5px;color:var(--text-3);line-height:1.75;padding:6px 0}
.target-item{
  display:flex;align-items:center;gap:10px;
  padding:9px 11px;border-radius:9px;
  background:var(--panel-2);border:1px solid var(--border);
  transition:all .16s;
}
.target-item.active{
  background:var(--accent-soft);border-color:#b9cdfa;
}
.target-item.active .ti-name{color:var(--accent)}
.ti-dot{
  width:8px;height:8px;border-radius:50%;flex-shrink:0;
  box-shadow:0 0 0 3px rgba(0,0,0,.04);
}
.ti-main{flex:1;min-width:0}
.ti-name{font-size:12.5px;font-weight:500;color:var(--text);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.ti-meta{font-size:10.5px;color:var(--text-3);margin-top:1px}
.ti-del{
  background:none;border:none;cursor:pointer;color:var(--text-3);
  font-size:15px;line-height:1;padding:3px 5px;border-radius:5px;flex-shrink:0;
}
.ti-del:hover{color:var(--red);background:#fdefee}

/* 目标列表里的左右手标签 */
.ti-side{
  display:inline-block;margin-left:6px;
  font-size:10px;font-weight:600;line-height:1.5;
  padding:0 6px;border-radius:999px;vertical-align:1px;
}
.ti-side-left{background:#f3ecff;color:var(--purple)}
.ti-side-right{background:var(--accent-soft);color:var(--accent)}

/* 提示 */
.card-tip{background:var(--panel-2)}
.card-tip h3{font-size:12px;font-weight:600;margin-bottom:9px;color:var(--text-2)}
.card-tip ul{list-style:none;display:flex;flex-direction:column;gap:7px}
.card-tip li{
  font-size:11.5px;color:var(--text-2);line-height:1.7;
  padding-left:13px;position:relative;
}
.card-tip li::before{
  content:"";position:absolute;left:0;top:7px;
  width:4px;height:4px;border-radius:50%;background:var(--border-strong);
}
.card-tip b{color:var(--accent);font-weight:600}

/* ---------- 模型加载中 ---------- */
.video-loading{
  position:absolute;inset:0;z-index:5;
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  gap:9px;text-align:center;padding:24px;
  background:rgba(14,17,22,.62);
  backdrop-filter:blur(3px);
}
.video-loading[hidden]{display:none}
.video-loading .spinner{
  width:30px;height:30px;border-radius:50%;
  border:3px solid rgba(255,255,255,.25);
  border-top-color:#fff;
  animation:hf-spin .75s linear infinite;
}
.video-loading p{font-size:13px;color:#e8edf3;font-weight:500}
.video-loading small{font-size:11.5px;color:#a8b0ba}
@keyframes hf-spin{to{transform:rotate(360deg)}}

/* ---------- Toast ---------- */
.toast{
  position:fixed;bottom:26px;left:50%;transform:translateX(-50%) translateY(14px);
  background:#1a1d21;color:#fff;
  font-size:12.5px;padding:10px 20px;border-radius:9px;
  opacity:0;pointer-events:none;transition:all .22s;
  box-shadow:0 8px 24px rgba(0,0,0,.2);z-index:100;
}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

/* ---------- “显示细节”开关 ---------- */
.switch{
  display:inline-flex;align-items:center;gap:8px;
  margin-left:auto;
  font-size:12.5px;color:var(--text-2);
  cursor:pointer;user-select:none;
  padding:8px 13px;border-radius:9px;
  border:1px solid var(--border);
  background:var(--panel-2);
  transition:all .16s;
}
.switch:hover{border-color:var(--border-strong);color:var(--text)}
.switch input{position:absolute;width:0;height:0;opacity:0;pointer-events:none}
.switch-track{
  position:relative;flex-shrink:0;
  width:36px;height:20px;border-radius:999px;
  background:#d6dae0;transition:background .18s;
}
.switch-knob{
  position:absolute;top:2px;left:2px;
  width:16px;height:16px;border-radius:50%;
  background:#fff;box-shadow:0 1px 2px rgba(16,24,40,.25);
  transition:transform .18s;
}
.switch input:checked + .switch-track{background:var(--accent)}
.switch input:checked + .switch-track .switch-knob{transform:translateX(16px)}
.switch input:focus-visible + .switch-track{outline:2px solid var(--accent-soft);outline-offset:2px}