:root {
  --bg: #ffffff;
  --fg: #1c1c1e;
  --muted: #8e8e93;
  --border: #e4e4e8;
  --surface: #f5f5f7;
  --danger: #d64541;
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

html, body {
  height: 100%;
  margin: 0;
}

body {
  background: var(--bg);
  color: var(--fg);
  font: 15px/1.5 -apple-system, "Segoe UI", "Inter", Roboto, "Helvetica Neue", sans-serif;
  display: flex;
  flex-direction: column;
}

#top {
  display: flex;
  gap: 16px;
  align-items: center;
  padding: 12px 20px;
  border-bottom: 1px solid var(--border);
  flex: none;
  white-space: nowrap;
  overflow: hidden;
}

.brand { font-weight: 600; }

.dim, .sys { color: var(--muted); }

#ttl { color: var(--muted); font-variant-numeric: tabular-nums; }

#stat { font-size: 14px; }

#burnBtn {
  margin-left: auto;
  background: none;
  border: 1px solid var(--danger);
  color: var(--danger);
  font: inherit;
  font-size: 14px;
  padding: 5px 14px;
  border-radius: 8px;
  cursor: pointer;
}

#burnBtn:hover { background: var(--danger); color: #fff; }

#log {
  flex: 1;
  overflow-y: auto;
  padding: 16px 20px;
  max-width: 720px;
  width: 100%;
  margin: 0 auto;
  overflow-wrap: anywhere;
}

.ln { margin: 3px 0; }

.sys { font-size: 13px; }
.sys.warn { color: #b08000; }
.sys.err { color: var(--danger); }

.nick { font-weight: 600; }
.nick.self { color: var(--muted); }
.nick.peer { color: var(--fg); }

.act { font-style: italic; color: var(--muted); }

#bar {
  display: flex;
  gap: 10px;
  align-items: center;
  padding: 12px 20px;
  border-top: 1px solid var(--border);
  flex: none;
  max-width: 720px;
  width: 100%;
  margin: 0 auto;
}

#msg {
  flex: 1;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  outline: none;
  color: var(--fg);
  font: inherit;
  padding: 9px 14px;
}

#msg:focus { border-color: var(--fg); }

button.primary, #cfg button, #linkView button, #end button {
  background: var(--fg);
  border: none;
  color: #fff;
  font: inherit;
  font-size: 14px;
  padding: 9px 18px;
  border-radius: 8px;
  cursor: pointer;
  margin: 8px 8px 0 0;
}

button.primary:hover, #cfg button:hover, #linkView button:hover, #end button:hover {
  opacity: 0.85;
}

.screen {
  padding: 48px 20px;
  max-width: 560px;
  margin: 0 auto;
  width: 100%;
}

h1 {
  font-size: 22px;
  font-weight: 600;
  margin: 0 0 24px;
}

h2 {
  font-size: 17px;
  font-weight: 600;
  margin: 0 0 12px;
}

.row { margin: 14px 0; }

.row > label {
  display: block;
  margin: 6px 0;
  color: var(--fg);
}

input[type="radio"] { accent-color: var(--fg); margin-right: 6px; }

input[type="number"] {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--fg);
  font: inherit;
  padding: 6px 8px;
  width: 5.5ch;
  text-align: center;
}

input[type="number"]:focus { outline: none; border-color: var(--fg); }

.hint { color: var(--muted); font-size: 13px; margin-top: 16px; }

.selbox {
  background: var(--surface);
  border-radius: 10px;
  padding: 14px;
  font: 13px/1.5 "SF Mono", "Menlo", monospace;
  overflow-wrap: anywhere;
  user-select: all;
  cursor: text;
  margin-bottom: 4px;
}

#end {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 60vh;
}

#endMsg { color: var(--fg); font-size: 16px; white-space: pre-wrap; }

#end .hint { margin-top: 8px; }