:root {
  --bg: #0f172a;
  --card: #1e293b;
  --card-2: #273449;
  --text: #f1f5f9;
  --muted: #94a3b8;
  --accent: #38bdf8;
  --accent-2: #0ea5e9;
  --ok: #34d399;
  --warn: #fbbf24;
  --err: #f87171;
  --radius: 14px;
}

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

body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header { text-align: center; padding: 28px 16px 8px; }
header h1 { font-size: 1.9rem; letter-spacing: -0.02em; }
.tagline { color: var(--muted); margin-top: 6px; font-size: 0.95rem; }

main {
  flex: 1;
  width: 100%;
  max-width: 560px;
  margin: 0 auto;
  padding: 20px 16px 40px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.view { display: flex; flex-direction: column; gap: 16px; }
.hidden { display: none !important; }

.card {
  background: var(--card);
  border: 1px solid #334155;
  border-radius: var(--radius);
  padding: 20px;
}
.card h2 { font-size: 1.05rem; margin-bottom: 14px; color: var(--accent); }

.qr-card { text-align: center; }
.qr-box {
  background: #fff;
  border-radius: 12px;
  padding: 16px;
  display: inline-block;
  min-width: 260px;
  min-height: 260px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.qr-placeholder { color: #334155; font-size: 0.95rem; }
.qr-box canvas, .qr-box img { display: block; }

.host-id {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-top: 16px;
  font-size: 1.4rem;
}
.id-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted);
}
.id-value {
  font-family: ui-monospace, "Cascadia Mono", Consolas, monospace;
  font-weight: 700;
  letter-spacing: 0.25em;
  background: var(--card-2);
  padding: 4px 14px;
  border-radius: 8px;
}

.status {
  margin-top: 14px;
  font-size: 0.95rem;
  padding: 8px 12px;
  border-radius: 8px;
  background: var(--card-2);
}
.status-waiting { color: var(--warn); }
.status-connecting { color: var(--warn); }
.status-connected { color: var(--ok); }
.status-error { color: var(--err); }

.dropzone {
  border: 2px dashed #475569;
  border-radius: var(--radius);
  padding: 18px;
  text-align: center;
  color: var(--muted);
  transition: border-color 0.15s, background 0.15s;
}
.dropzone.dragover { border-color: var(--accent); background: rgba(56, 189, 248, 0.08); }
.dropzone-big { padding: 44px 18px; cursor: pointer; }
.drop-big { font-size: 2.2rem; margin-bottom: 10px; }
.dropzone strong { color: var(--text); }

.btn {
  appearance: none;
  border: 1px solid #475569;
  background: var(--card-2);
  color: var(--text);
  font-size: 0.95rem;
  font-weight: 600;
  padding: 10px 20px;
  border-radius: 10px;
  cursor: pointer;
  margin-top: 12px;
}
.btn:hover { background: #334155; }
.btn-primary {
  background: var(--accent-2);
  border-color: var(--accent-2);
  color: #fff;
  padding: 14px 28px;
}
.btn-primary:hover { background: var(--accent); }

.file-list { display: flex; flex-direction: column; gap: 10px; margin-top: 14px; }
.empty-note { color: var(--muted); font-size: 0.9rem; }

.file-item {
  background: var(--card-2);
  border-radius: 10px;
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.file-row {
  display: flex;
  align-items: center;
  gap: 10px;
}
.file-icon { font-size: 1.4rem; }
.file-name {
  flex: 1;
  font-weight: 600;
  font-size: 0.95rem;
  word-break: break-all;
}
.file-size { color: var(--muted); font-size: 0.8rem; white-space: nowrap; }
.file-actions { display: flex; gap: 8px; }
.file-actions .btn { margin-top: 0; padding: 7px 16px; font-size: 0.85rem; }

.progress {
  height: 8px;
  background: #0f172a;
  border-radius: 99px;
  overflow: hidden;
}
.progress-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent-2), var(--accent));
  border-radius: 99px;
  transition: width 0.15s ease;
}
.progress-bar.done { background: var(--ok); }

footer {
  text-align: center;
  padding: 16px;
  color: var(--muted);
  font-size: 0.78rem;
}

@media (min-width: 900px) {
  main { max-width: 760px; }
  #hostView { display: grid; grid-template-columns: 1fr 1fr; align-items: start; }
  #hostView .qr-card { grid-row: span 2; }
}