:root {
  color-scheme: light dark;
  --bg: #0f1115;
  --fg: #e8eaed;
  --muted: #9aa0a6;
  --accent: #7cb3ff;
  --border: #2a3038;
  --panel: #161a21;
  --ok: #6ee7b7;
  --err: #fca5a5;
  font-family:
    ui-sans-serif,
    system-ui,
    -apple-system,
    Segoe UI,
    Roboto,
    Helvetica,
    Arial,
    sans-serif;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f6f7fb;
    --fg: #1a1d23;
    --muted: #5c6370;
    --accent: #1d63d8;
    --border: #d8dee9;
    --panel: #ffffff;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.5;
}

.top {
  padding: 2rem 1.5rem 1rem;
  border-bottom: 1px solid var(--border);
}

.top h1 {
  margin: 0;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.tagline {
  margin: 0.35rem 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

main {
  max-width: 40rem;
  margin: 0 auto;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.field span {
  font-size: 0.85rem;
  color: var(--muted);
}

input[type="url"],
input[type="text"] {
  width: 100%;
  padding: 0.55rem 0.65rem;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--fg);
  font-size: 1rem;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem 1.1rem;
}

.panel h2 {
  margin: 0 0 0.75rem;
  font-size: 1.1rem;
  font-weight: 600;
}

.dropzone {
  border: 2px dashed var(--border);
  border-radius: 8px;
  padding: 1.25rem;
  text-align: center;
  transition:
    border-color 0.15s,
    background 0.15s;
}

.dropzone.drag {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 12%, transparent);
}

.dropzone p {
  margin: 0;
}

.dropzone button {
  background: none;
  border: none;
  color: var(--accent);
  text-decoration: underline;
  cursor: pointer;
  font: inherit;
  padding: 0;
}

.muted {
  color: var(--muted);
  font-size: 0.9rem;
}

.code-box {
  margin-top: 0.75rem;
}

.code-box .label {
  font-size: 0.85rem;
  color: var(--muted);
  margin: 0 0 0.35rem;
}

.code-box code {
  display: block;
  font-size: 1.15rem;
  word-break: break-all;
  padding: 0.5rem 0.65rem;
  background: var(--bg);
  border-radius: 6px;
  border: 1px solid var(--border);
}

#qrHost {
  margin-top: 0.75rem;
  display: flex;
  justify-content: center;
}

#qrHost canvas {
  border-radius: 6px;
}

button#recvBtn {
  margin-top: 0.5rem;
  padding: 0.55rem 1rem;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  cursor: pointer;
}

button#recvBtn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.progress {
  margin-top: 0.75rem;
  height: 6px;
  background: var(--bg);
  border-radius: 3px;
  overflow: hidden;
}

.progress .bar {
  height: 100%;
  width: 0%;
  background: var(--accent);
  transition: width 0.1s linear;
}

.progress.indet .bar {
  width: 100%;
  animation: indet-pulse 1s ease-in-out infinite;
}

@keyframes indet-pulse {
  0%,
  100% {
    opacity: 0.35;
  }
  50% {
    opacity: 1;
  }
}

.status {
  margin: 0.5rem 0 0;
  min-height: 1.5rem;
  font-size: 0.9rem;
}

.status.ok {
  color: var(--ok);
}

.status.err {
  color: var(--err);
}

#recvDownload a {
  color: var(--accent);
}

.foot {
  padding: 2rem 1.5rem;
  text-align: center;
  font-size: 0.85rem;
}