:root{
  --bg:            #0B1A17;
  --panel:         #10231F;
  --panel-line:    #1D3B34;
  --amber:         #F2A93B;
  --amber-dim:     #8A6427;
  --teal:          #4FD1AE;
  --text:          #E8EFE9;
  --muted:         #7C9C90;
  --danger:        #E2664F;

  --font-display: 'Space Grotesk', sans-serif;
  --font-body:    'IBM Plex Sans', sans-serif;
  --font-mono:    'IBM Plex Mono', monospace;
}

*{ box-sizing:border-box; }

@media (prefers-reduced-motion: reduce){
  *{ animation-duration:0.001ms !important; animation-iteration-count:1 !important; transition-duration:0.001ms !important; }
}

html,body{
  margin:0;
  min-height:100vh;
  background:
    radial-gradient(ellipse at 20% -10%, rgba(79,209,174,0.08), transparent 55%),
    radial-gradient(ellipse at 85% 110%, rgba(242,169,59,0.07), transparent 55%),
    var(--bg);
  color:var(--text);
  font-family:var(--font-body);
}

.scanlines{
  position:fixed; inset:0; pointer-events:none; z-index:0;
  background:repeating-linear-gradient(
    to bottom,
    rgba(255,255,255,0.012) 0px,
    rgba(255,255,255,0.012) 1px,
    transparent 1px,
    transparent 3px
  );
}

/* ---------- topbar ---------- */
.topbar{
  position:relative; z-index:1;
  max-width:960px; margin:0 auto;
  padding:44px 24px 8px;
  text-align:center;
}
.brand{
  display:flex; align-items:center; justify-content:center; gap:10px;
  font-family:var(--font-display);
  font-size:1.6rem; font-weight:700; letter-spacing:0.02em;
}
.brand-mark{ color:var(--amber); }
.brand-tag{
  margin:10px 0 0;
  color:var(--muted);
  font-size:0.92rem;
}

/* ---------- board layout ---------- */
.board{
  position:relative; z-index:1;
  max-width:960px; margin:36px auto 0;
  padding:0 24px;
  display:grid;
  grid-template-columns:1fr 60px 1fr;
  align-items:start;
  gap:0 8px;
}
@media (max-width:760px){
  .board{ grid-template-columns:1fr; gap:28px 0; }
  .relay-line{ transform:rotate(90deg); width:60px; margin:-4px auto; }
}

/* ---------- panel ---------- */
.panel{
  background:var(--panel);
  border:1px solid var(--panel-line);
  border-radius:10px;
  padding:26px 24px 28px;
  min-height:360px;
}
.panel-head{ margin-bottom:20px; }
.panel-eyebrow{
  display:block;
  font-family:var(--font-mono);
  font-size:0.72rem;
  letter-spacing:0.14em;
  text-transform:uppercase;
  color:var(--teal);
  margin-bottom:4px;
}
.panel-head h2{
  margin:0;
  font-family:var(--font-display);
  font-weight:600;
  font-size:1.35rem;
}

/* ---------- relay line ---------- */
.relay-line{ align-self:center; margin-top:60px; }
.relay-svg{ width:100%; height:40px; overflow:visible; }
.relay-track{ stroke:var(--panel-line); stroke-width:2; }
.relay-pulse{ fill:var(--amber); filter:drop-shadow(0 0 4px rgba(242,169,59,0.8)); }

/* ---------- dropzone ---------- */
.dropzone{
  display:flex; flex-direction:column; align-items:center; justify-content:center;
  gap:8px;
  border:1.5px dashed var(--panel-line);
  border-radius:8px;
  padding:34px 16px;
  cursor:pointer;
  text-align:center;
  transition:border-color 0.15s ease, background 0.15s ease;
}
.dropzone:hover, .dropzone:focus-within{
  border-color:var(--teal);
  background:rgba(79,209,174,0.04);
}
.dropzone-icon{ font-size:1.5rem; color:var(--teal); }
.dropzone-text{ font-weight:500; }
.dropzone-sub{ font-size:0.8rem; color:var(--muted); }

.file-chip{
  display:flex; align-items:center; gap:10px;
  margin-top:14px;
  padding:10px 12px;
  background:rgba(0,0,0,0.18);
  border:1px solid var(--panel-line);
  border-radius:6px;
  font-family:var(--font-mono);
  font-size:0.85rem;
}
.file-chip-name{ flex:1; overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
.file-chip-size{ color:var(--muted); }
.chip-clear{
  background:none; border:none; color:var(--muted); cursor:pointer;
  font-size:0.85rem; padding:2px 4px;
}
.chip-clear:hover{ color:var(--danger); }

/* ---------- buttons ---------- */
.btn{
  display:block; width:100%;
  margin-top:16px;
  padding:12px 16px;
  border-radius:7px;
  border:1px solid transparent;
  font-family:var(--font-body);
  font-weight:600;
  font-size:0.92rem;
  text-align:center;
  cursor:pointer;
  text-decoration:none;
  transition:opacity 0.15s ease, transform 0.1s ease;
}
.btn:active{ transform:translateY(1px); }
.btn:disabled{ opacity:0.4; cursor:not-allowed; }
.btn-primary{
  background:var(--amber);
  color:#1A1206;
}
.btn-primary:hover:not(:disabled){ opacity:0.92; }
.btn-ghost{
  background:transparent;
  border-color:var(--panel-line);
  color:var(--muted);
}
.btn-ghost:hover{ border-color:var(--danger); color:var(--danger); }

/* ---------- frequency readout (room code) ---------- */
.freq-readout{
  display:flex; flex-direction:column; align-items:center;
  padding:18px 10px;
  border:1px solid var(--panel-line);
  border-radius:8px;
  background:rgba(0,0,0,0.2);
}
.freq-label{
  font-family:var(--font-mono);
  font-size:0.7rem;
  letter-spacing:0.14em;
  text-transform:uppercase;
  color:var(--muted);
}
.freq-code{
  margin-top:6px;
  font-family:var(--font-mono);
  font-size:2.1rem;
  font-weight:600;
  letter-spacing:0.12em;
  color:var(--amber);
  text-shadow:0 0 18px rgba(242,169,59,0.35);
}

.qr-wrap{
  display:flex; justify-content:center;
  margin:18px 0;
  padding:12px;
  background:#fff;
  border-radius:8px;
  width:fit-content;
  margin-left:auto; margin-right:auto;
}

.hint{ font-size:0.8rem; color:var(--muted); text-align:center; margin:10px 0 0; }
.hint-alt{ margin-top:16px; }

/* ---------- status line ---------- */
.status-line{
  display:flex; align-items:center; gap:9px;
  margin-top:18px;
  padding:9px 12px;
  border:1px solid var(--panel-line);
  border-radius:6px;
  font-size:0.83rem;
}
.status-dot{
  width:8px; height:8px; border-radius:50%;
  background:var(--muted);
  flex-shrink:0;
}
.status-dot[data-state="waiting"]{ background:var(--amber); animation:pulse 1.4s ease-in-out infinite; }
.status-dot[data-state="connected"]{ background:var(--teal); }
.status-dot[data-state="error"]{ background:var(--danger); }
.status-dot[data-state="done"]{ background:var(--teal); }
@keyframes pulse{ 0%,100%{ opacity:1; } 50%{ opacity:0.35; } }

/* ---------- transfer bar ---------- */
.transfer{ margin-top:18px; }
.transfer-track{
  height:6px;
  border-radius:4px;
  background:rgba(0,0,0,0.3);
  overflow:hidden;
}
.transfer-fill{
  height:100%; width:0%;
  background:linear-gradient(90deg, var(--teal), var(--amber));
  transition:width 0.15s ease;
}
.transfer-meta{
  display:flex; justify-content:space-between;
  margin-top:6px;
  font-family:var(--font-mono);
  font-size:0.75rem;
  color:var(--muted);
}

/* ---------- receive: code entry ---------- */
.code-entry-label{
  display:block; font-size:0.82rem; color:var(--muted); margin-bottom:8px;
}
.code-entry{
  width:100%;
  padding:14px 12px;
  background:rgba(0,0,0,0.2);
  border:1px solid var(--panel-line);
  border-radius:7px;
  color:var(--amber);
  font-family:var(--font-mono);
  font-size:1.4rem;
  letter-spacing:0.2em;
  text-align:center;
}
.code-entry:focus{ outline:none; border-color:var(--teal); }

/* ---------- incoming card ---------- */
.incoming-card{
  display:flex; flex-direction:column; gap:4px;
  padding:16px;
  border:1px solid var(--panel-line);
  border-radius:8px;
  background:rgba(0,0,0,0.18);
}
.incoming-label{
  font-family:var(--font-mono); font-size:0.7rem; letter-spacing:0.14em;
  text-transform:uppercase; color:var(--teal);
}
.incoming-name{ font-weight:500; word-break:break-all; }
.incoming-size{ font-family:var(--font-mono); font-size:0.78rem; color:var(--muted); }

/* ---------- footer ---------- */
.foot{
  position:relative; z-index:1;
  text-align:center;
  padding:34px 24px 40px;
  font-family:var(--font-mono);
  font-size:0.75rem;
  color:var(--muted);
}