:root{
  --bg:            #0a0c0f;
  --panel:         rgba(18, 22, 26, 0.82);
  --panel-solid:   #12161a;
  --line:          rgba(255,255,255,0.08);
  --ink:           #e8ecef;
  --muted:         #7c8791;
  --signal:        #00e6a0;   /* confident / active */
  --signal-dim:    #0a4d3c;
  --amber:         #ffb020;   /* static mode / warnings */
  --amber-dim:     #4d3a10;
  --red:           #ff4d5e;   /* uncertain / no hand */
  --blue:          #4da6ff;   /* dynamic mode */
  --mono: "IBM Plex Mono", "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

*{box-sizing:border-box;}
html,body{height:100%;}
body{
  margin:0;
  background:
    radial-gradient(1200px 600px at 15% -10%, rgba(0,230,160,0.06), transparent 60%),
    radial-gradient(1000px 500px at 100% 110%, rgba(77,166,255,0.06), transparent 60%),
    var(--bg);
  color:var(--ink);
  font-family:var(--sans);
  min-height:100%;
}

.app{
  max-width:1240px;
  margin:0 auto;
  padding:28px 20px 60px;
}

/* ── header / signature scan line ───────────────────────────── */
.hdr{
  display:flex;
  align-items:baseline;
  justify-content:space-between;
  gap:16px;
  margin-bottom:18px;
  padding-bottom:14px;
  border-bottom:1px solid var(--line);
  position:relative;
  overflow:hidden;
}
.hdr::after{
  content:"";
  position:absolute;
  left:-20%;
  bottom:-1px;
  width:20%;
  height:1px;
  background:linear-gradient(90deg, transparent, var(--signal), transparent);
  animation:scan 5.5s linear infinite;
}
@keyframes scan{
  0%{ left:-20%; }
  100%{ left:100%; }
}
.hdr h1{
  font-family:var(--mono);
  font-size:15px;
  letter-spacing:.14em;
  text-transform:uppercase;
  font-weight:600;
  margin:0;
  color:var(--ink);
}
.hdr h1 span{ color:var(--signal); }
.hdr .sub{
  font-family:var(--mono);
  font-size:11px;
  color:var(--muted);
  letter-spacing:.06em;
}

.grid{
  display:grid;
  grid-template-columns:minmax(0,1.55fr) minmax(300px,1fr);
  gap:20px;
}
@media (max-width:920px){
  .grid{grid-template-columns:1fr;}
}

/* ── camera stage ───────────────────────────────────────────── */
.stage{
  position:relative;
  border-radius:14px;
  overflow:hidden;
  border:1px solid var(--line);
  background:#000;
  aspect-ratio:4/3;
}
.stage video, .stage canvas{
  position:absolute;
  inset:0;
  width:100%;
  height:100%;
  object-fit:cover;
}
.stage video{ transform:scaleX(-1); }
.stage canvas{ transform:scaleX(-1); pointer-events:none; }

.hud-top{
  position:absolute; top:12px; left:12px; right:12px;
  display:flex; justify-content:space-between; align-items:flex-start;
  gap:10px; pointer-events:none;
}
.badge{
  font-family:var(--mono);
  font-size:11px;
  letter-spacing:.08em;
  padding:5px 9px;
  border-radius:6px;
  background:var(--panel);
  border:1px solid var(--line);
  backdrop-filter:blur(6px);
  text-transform:uppercase;
}
.badge.mode-dynamic{ color:var(--blue); border-color:rgba(77,166,255,.35); }
.badge.mode-static{ color:var(--amber); border-color:rgba(255,176,32,.35); }
.badge.fps{ color:var(--muted); }

.label-block{
  position:absolute; left:16px; bottom:110px;
  pointer-events:none;
}
.label-main{
  font-family:var(--mono);
  font-size:clamp(28px,6vw,44px);
  font-weight:700;
  letter-spacing:.02em;
  text-shadow:0 2px 18px rgba(0,0,0,.6);
  color:var(--signal);
}
.label-main.uncertain{ color:var(--red); }
.label-conf{
  font-family:var(--mono);
  font-size:13px;
  color:var(--ink);
  opacity:.85;
  margin-top:2px;
}

.buffer-wrap{
  position:absolute; left:16px; right:16px; bottom:78px;
  pointer-events:none;
}
.buffer-track{
  height:5px; border-radius:3px; background:rgba(255,255,255,.12); overflow:hidden;
}
.buffer-fill{
  height:100%; background:var(--signal); width:0%;
  transition:width .08s linear;
}
.buffer-txt{
  font-family:var(--mono); font-size:10px; color:var(--muted); margin-top:4px;
}

.hands-txt{
  position:absolute; left:16px; bottom:14px;
  font-family:var(--mono); font-size:12px; color:var(--muted);
  pointer-events:none;
}

/* ── side panel ─────────────────────────────────────────────── */
.panel{
  background:var(--panel-solid);
  border:1px solid var(--line);
  border-radius:14px;
  padding:16px;
  display:flex;
  flex-direction:column;
  gap:14px;
}
.panel h2{
  font-family:var(--mono);
  font-size:11px;
  letter-spacing:.1em;
  text-transform:uppercase;
  color:var(--muted);
  margin:0 0 8px;
}

.top5-row{
  display:flex; align-items:center; gap:8px; margin-bottom:6px;
}
.top5-label{
  font-family:var(--mono); font-size:12px; width:34px; color:var(--ink); flex:none;
}
.top5-track{
  flex:1; height:10px; border-radius:5px; background:rgba(255,255,255,.08); overflow:hidden;
}
.top5-fill{ height:100%; background:var(--blue); }
.top5-row:first-child .top5-fill{ background:var(--signal); }
.top5-score{
  font-family:var(--mono); font-size:11px; color:var(--muted); width:38px; text-align:right; flex:none;
}

.controls{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:8px;
}
button{
  font-family:var(--sans);
  font-size:13px;
  font-weight:600;
  color:var(--ink);
  background:#1b2126;
  border:1px solid var(--line);
  border-radius:8px;
  padding:9px 10px;
  cursor:pointer;
  transition:background .15s, border-color .15s, transform .05s;
}
button:hover{ background:#232b31; border-color:rgba(255,255,255,.18); }
button:active{ transform:translateY(1px); }
button.primary{ background:var(--signal); color:#052018; border-color:var(--signal); }
button.primary:hover{ background:#12ffb8; }
button.wide{ grid-column:1 / -1; }
button.on{ border-color:var(--signal); color:var(--signal); }
button.off{ border-color:var(--muted); color:var(--muted); }
button:disabled{ opacity:.4; cursor:not-allowed; }
kbd{
  font-family:var(--mono); font-size:10px; color:var(--muted);
  border:1px solid var(--line); border-radius:4px; padding:1px 5px;
  margin-left:6px;
}

.gloss-box{
  font-family:var(--mono);
  font-size:13px;
  min-height:40px;
  padding:10px;
  background:#0d1013;
  border:1px solid var(--line);
  border-radius:8px;
  color:var(--ink);
  line-height:1.5;
  word-break:break-word;
}
.gloss-box .empty{ color:var(--muted); font-style:italic; }
.gloss-box .spelling{ color:var(--amber); }

.sentence-box{
  font-family:var(--sans);
  font-size:15px;
  padding:12px;
  background:linear-gradient(180deg, rgba(0,230,160,.08), rgba(0,230,160,.02));
  border:1px solid rgba(0,230,160,.25);
  border-radius:8px;
  min-height:44px;
  color:var(--ink);
}
.sentence-box .empty{ color:var(--muted); font-style:italic; font-family:var(--mono); font-size:13px; }
.sentence-meta{
  font-family:var(--mono); font-size:10px; color:var(--muted); margin-top:6px;
}

.status-line{
  font-family:var(--mono); font-size:11px; color:var(--muted);
  display:flex; justify-content:space-between; gap:8px;
}
.dot{
  display:inline-block; width:7px; height:7px; border-radius:50%; margin-right:5px;
}
.dot.ok{ background:var(--signal); box-shadow:0 0 6px var(--signal); }
.dot.bad{ background:var(--red); }

.footer-note{
  font-family:var(--mono); font-size:10.5px; color:var(--muted); margin-top:22px; line-height:1.6;
}