:root{
  --bg:#101216;
  --panel:#171a20;
  --panel2:#1d2129;
  --line:#2b303a;
  --text:#f5f7fa;
  --muted:#99a3b2;
  --accent:#25a9e0;
  --accent2:#72d5ff;
  --warn:#ffc941;
  --danger:#ff6464;
  --radius:12px;
  font-family:"Segoe UI",Inter,system-ui,-apple-system,BlinkMacSystemFont,sans-serif;
  color-scheme:dark;
}
*{box-sizing:border-box}
html,body{margin:0;width:100%;height:100%;overflow:hidden;background:var(--bg);color:var(--text)}
button,input{font:inherit}
button{user-select:none}
.hidden{display:none!important}

.app-header{
  height:72px;display:flex;align-items:center;justify-content:space-between;
  padding:0 18px;border-bottom:1px solid var(--line);
  background:rgba(16,18,22,.97);backdrop-filter:blur(14px);position:relative;z-index:20
}
.brand{display:flex;align-items:center;gap:14px;min-width:0}
.brand img{width:56px;height:42px;object-fit:contain}
.brand-copy{display:flex;flex-direction:column;line-height:1.12}
.brand-copy strong{font-size:20px;letter-spacing:.2px}
.brand-copy span{font-size:12px;color:var(--muted);margin-top:5px}
.header-actions{display:flex;gap:8px}
.btn,.tool-btn,.mini-btn{
  border:1px solid #353b46;background:#232831;color:var(--text);
  border-radius:8px;padding:9px 13px;cursor:pointer;transition:.14s ease;
}
.btn:hover,.tool-btn:hover,.mini-btn:hover{background:#2b323d;border-color:#46505e}
.btn:disabled{opacity:.4;cursor:not-allowed}
.btn.primary,.tool-btn.active{background:#148fc4;border-color:#1eacdF;color:white}
.btn.primary:hover{background:#18a1da}
.btn.large{font-size:16px;padding:12px 20px}

.welcome{height:calc(100vh - 72px);display:grid;place-items:center;padding:24px}
.welcome-card{
  width:min(560px,92vw);padding:44px;text-align:center;background:linear-gradient(160deg,#1b1f26,#12151a);
  border:1px solid var(--line);border-radius:20px;box-shadow:0 20px 70px rgba(0,0,0,.35)
}
.welcome-icon{width:92px;height:92px;object-fit:contain;filter:drop-shadow(0 8px 18px rgba(0,0,0,.35))}
.welcome h1{font-size:28px;margin:16px 0 10px}
.welcome p{color:var(--muted);line-height:1.6;margin:0 0 24px}
.privacy-chip{margin:18px auto 0;display:inline-block;color:#a9b6c7;font-size:12px;padding:7px 10px;border-radius:999px;background:#20252d}

.workspace{height:calc(100vh - 72px);display:flex;flex-direction:column}
.toolstrip{
  display:flex;gap:14px;align-items:flex-end;flex-wrap:wrap;padding:10px 14px;
  border-bottom:1px solid var(--line);background:#14171c;min-height:82px;z-index:10
}
.toolgroup{display:flex;gap:6px;align-items:flex-end;position:relative;padding-top:18px}
.group-label{position:absolute;top:0;left:2px;font-size:10px;letter-spacing:.7px;color:#738094;text-transform:uppercase}
.tool-btn{padding:8px 10px;border-radius:6px;font-size:13px}

.content{flex:1;min-height:0;display:grid;grid-template-columns:minmax(0,1fr) 310px}
.viewport-wrap{position:relative;overflow:hidden;background:#08090b}
.viewport{position:absolute;inset:0;width:100%;height:100%;display:block}
#view2d{touch-action:none;cursor:grab}
#view2d.tool-active{cursor:crosshair}
#view3d canvas{display:block;width:100%;height:100%}

.side-panel{
  overflow:auto;border-left:1px solid var(--line);background:linear-gradient(180deg,#171a20,#12151a);
  padding:20px 18px
}
.side-panel section{padding:0 0 20px;margin-bottom:18px;border-bottom:1px solid #252a33}
.side-panel section:last-child{border-bottom:0}
.side-panel label{display:block;color:#6dbfe4;font-weight:700;font-size:10px;letter-spacing:.8px;margin-bottom:7px}
.side-panel h2{font-size:18px;margin:0 0 6px;overflow-wrap:anywhere}
.side-panel h3{font-size:17px;margin:0}
.muted{font-size:12px;color:var(--muted);line-height:1.5}
.result-box{min-height:92px}
.result-value{color:var(--warn);font-weight:750;font-size:22px;line-height:1.2}
.result-detail{white-space:pre-line;font-size:13px;color:#c7ced8;line-height:1.55;margin-top:8px}
.help-text{white-space:pre-line;font-size:13px;color:#bbc4d0;line-height:1.55}
.measure-list{display:flex;flex-direction:column;gap:7px}
.measure-item{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:8px 9px;background:#20252d;border:1px solid #2b323d;border-radius:7px;font-size:12px}
.measure-item b{color:#e9edf2}

.temperature-scale{
  position:absolute;left:22px;top:50%;transform:translateY(-50%);
  width:138px;padding:12px 10px;background:rgba(15,17,21,.82);
  border:1px solid rgba(255,255,255,.08);border-radius:10px;backdrop-filter:blur(8px);
  z-index:7;user-select:none
}
.scale-title{font-size:11px;color:#d8dde5;margin-bottom:10px;font-weight:650}
.scale-layout{height:310px;display:flex;gap:10px}
.scale-bar{
  width:28px;height:100%;position:relative;border-radius:3px;
  background:linear-gradient(to top,#180f38 0%,#67106c 23%,#d6294d 52%,#f57926 76%,#ffe778 100%);
  box-shadow:inset 0 0 0 1px rgba(255,255,255,.12)
}
.scale-mask{position:absolute;left:0;width:100%;background:rgba(38,41,47,.78);pointer-events:none}
.scale-handle{
  position:absolute;left:-6px;width:40px;height:4px;background:#2fd0ff;border-radius:3px;
  box-shadow:0 0 0 1px #061014,0 0 7px rgba(47,208,255,.45);cursor:ns-resize;z-index:3
}
.scale-handle span{
  position:absolute;left:47px;top:-8px;width:68px;color:#f5fbff;font-weight:700;font-size:11px;
  text-shadow:0 1px 3px #000
}
.scale-labels{height:100%;display:flex;flex-direction:column;justify-content:space-between;font-size:11px;color:#cbd2db;padding:0 0}
.mini-btn{width:100%;font-size:11px;padding:6px;margin-top:10px}

.loading{
  position:absolute;inset:0;z-index:30;display:flex;flex-direction:column;align-items:center;justify-content:center;
  gap:10px;background:rgba(7,8,10,.84);backdrop-filter:blur(6px)
}
.spinner{width:36px;height:36px;border-radius:50%;border:3px solid #29303a;border-top-color:var(--accent);animation:spin .8s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.loading span{color:var(--muted);font-size:13px}

.toast{
  position:fixed;bottom:20px;left:50%;transform:translateX(-50%);z-index:100;
  background:#252b34;border:1px solid #38414d;color:white;border-radius:9px;padding:10px 14px;
  box-shadow:0 10px 30px rgba(0,0,0,.35);font-size:13px
}

@media(max-width:1000px){
  .content{grid-template-columns:minmax(0,1fr) 260px}
  .side-panel{padding:16px 13px}
  .brand-copy span{display:none}
  .toolstrip{gap:9px}
}
@media(max-width:760px){
  .app-header{height:auto;min-height:70px;flex-wrap:wrap;padding:10px}
  .header-actions{width:100%;overflow:auto;padding-top:6px}
  .workspace{height:calc(100vh - 112px)}
  .content{grid-template-columns:1fr}
  .side-panel{display:none}
  .temperature-scale{left:8px;transform:translateY(-50%) scale(.88);transform-origin:left center}
}

.layer-select{
  height:33px;max-width:210px;border:1px solid #353b46;border-radius:6px;
  background:#232831;color:#f5f7fa;padding:0 8px;font-size:12px
}