:root {
  --bg: #0f1115;
  --card: #181b22;
  --line: #272b35;
  --fg: #e6e8ee;
  --muted: #8b93a7;
  --accent: #4c8dff;
  --ok: #3fb950;
  --err: #f85149;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 15px/1.5 -apple-system, "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
}

.view { padding: 24px; }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 20px;
  margin: 0 auto 16px;
  max-width: 720px;
}

.grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  max-width: 1200px;
  margin: 0 auto;
}

h1 { font-size: 20px; margin: 0 0 6px; }
h2 { font-size: 17px; margin: 0 0 12px; }
h3 { font-size: 14px; color: var(--muted); margin: 18px 0 8px; }

label { display: block; margin-bottom: 12px; color: var(--muted); font-size: 13px; }

input[type="password"], input[type="text"] {
  display: block;
  width: 100%;
  margin-top: 6px;
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: #10131a;
  color: var(--fg);
  font-size: 15px;
}

button {
  padding: 10px 16px;
  border-radius: 8px;
  border: 1px solid transparent;
  background: var(--accent);
  color: #fff;
  font-size: 14px;
  cursor: pointer;
}
button:disabled { opacity: .45; cursor: not-allowed; }
button.ghost { background: transparent; border-color: var(--line); color: var(--muted); }

.topbar {
  display: flex;
  align-items: center;
  gap: 10px;
  max-width: 1200px;
  margin: 0 auto 16px;
}
.topbar button { margin-left: auto; }

.badge {
  font-size: 12px;
  padding: 3px 10px;
  border-radius: 999px;
  background: rgba(76, 141, 255, .15);
  color: var(--accent);
}
.badge.muted { background: rgba(139, 147, 167, .15); color: var(--muted); }
.badge.online { background: rgba(63, 185, 80, .15); color: var(--ok); }
.badge.offline { background: rgba(248, 81, 73, .15); color: var(--err); }

.hint { color: var(--muted); font-size: 13px; }
.error { color: var(--err); font-size: 13px; }

.row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; margin-top: 10px; }

.device-list { display: flex; flex-direction: column; gap: 8px; }

.device {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  cursor: pointer;
}
.device.selected { border-color: var(--accent); background: rgba(76, 141, 255, .08); }
.device .name { font-weight: 500; }
.device .meta { color: var(--muted); font-size: 12px; margin-left: auto; }

.progress {
  height: 6px;
  background: #10131a;
  border-radius: 999px;
  overflow: hidden;
  margin-top: 10px;
}
.progress > div { height: 100%; width: 0; background: var(--accent); transition: width .12s linear; }

.incoming { display: flex; flex-direction: column; gap: 10px; }
.inbox {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px;
}
.inbox .fname { font-weight: 500; word-break: break-all; }
.inbox .row { margin-top: 8px; }

.received { list-style: none; padding: 0; margin: 0; font-size: 13px; }
.received li { color: var(--muted); padding: 4px 0; border-bottom: 1px dashed var(--line); }

.btn-lg {
  min-height: 48px;
  padding: 14px 22px;
  font-size: 16px;
  font-weight: 600;
}
.file-pick {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--accent);
  color: #fff;
  border-radius: 8px;
  cursor: pointer;
  position: relative;
  overflow: hidden;
}
.file-pick input[type="file"] {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}
.card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 8px;
}
.card-head h2 { margin: 0; }
.device {
  min-height: 56px;
  padding: 14px 16px;
}
.device input[type="radio"] {
  width: 20px;
  height: 20px;
}
.meta-line {
  max-width: 1200px;
  margin: -8px auto 16px;
  color: var(--muted);
  font-size: 13px;
}
.meta-line code {
  color: var(--fg);
  word-break: break-all;
}
button.tiny { padding: 4px 10px; font-size: 12px; min-height: auto; }
.copyable {
  white-space: pre-wrap;
  word-break: break-word;
  user-select: text;
  cursor: text;
  margin-top: 10px;
  padding: 8px 10px;
  border-radius: 8px;
  background: #10131a;
  border: 1px solid var(--line);
  min-height: 1.2em;
}
.copyable:empty, .copyable[hidden] { display: none; }