:root {
  color: #1c1f26;
  background: #f3f4f6;
  font: 15px/1.4 "Segoe UI", Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  padding: 18px 20px 28px;
}

h1 {
  margin: 0 0 6px;
  font-size: 22px;
}

.legend, .summary, .detail, .viewer-url {
  margin: 0;
  color: #5c6573;
}

.legend { max-width: 980px; }

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  margin: 12px 0 8px;
}

button, select {
  font: inherit;
  color: inherit;
}

button {
  background: #fff;
  border: 1px solid #c5cad3;
  border-radius: 6px;
  padding: 6px 12px;
  cursor: pointer;
}

button:hover { border-color: #2563eb; }

label { display: inline-flex; gap: 6px; align-items: center; }

select { padding: 5px 8px; border-radius: 6px; border: 1px solid #c5cad3; background: #fff; }

.summary { margin-top: 4px; color: #1c1f26; }

.board {
  margin-top: 12px;
  padding: 12px;
  background: #fff;
  border: 1px solid #d5d8e0;
  overflow-x: auto;
}

.grid {
  display: grid;
  grid-template-columns: 40px repeat(16, 44px);
  gap: 4px;
  width: max-content;
}

.axis {
  display: grid;
  place-items: center;
  color: #5c6573;
  font-size: 12px;
}

.cell {
  width: 44px;
  height: 44px;
  padding: 2px 0 3px;
  border: 1px solid #c5cad3;
  border-radius: 2px;
  background: #e7e9ee;
  color: #4b5160;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  cursor: pointer;
}

.cell .octet { font-size: 11px; line-height: 1; }

.dots { display: flex; gap: 2px; height: 6px; }

.dot {
  width: 6px;
  height: 6px;
  border-radius: 1px;
  background: transparent;
}

.cell.pending { background: #e7e9ee; color: #4b5160; border-color: #c5cad3; }
.cell.pinging { background: #f5b400; color: #1f1600; border-color: #8a5a00; border-width: 2px; }
.cell.up { background: #1f9d55; color: #fff; border-color: #14753e; }
.cell.down { background: #d64545; color: #fff; border-color: #a32e2e; }
.cell:hover, .cell:focus { outline: 3px solid #111827; outline-offset: 0; }

.dot.open { background: #f8fafc; }
.dot.refused { background: #ff2bd6; }
.dot.closed { background: #166534; }

.detail { margin-top: 12px; color: #1c1f26; font-size: 16px; }

dialog {
  width: min(1100px, calc(100vw - 32px));
  height: min(820px, calc(100vh - 32px));
  border: 1px solid #d5d8e0;
  border-radius: 10px;
  padding: 12px;
  background: #fff;
}

dialog::backdrop { background: rgba(17, 24, 39, 0.35); }

.viewer-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.viewer-url { margin: 8px 0; }

#viewer-frame {
  width: 100%;
  height: calc(100% - 84px);
  border: 1px solid #d5d8e0;
  background: #fff;
}

#viewer-open { color: #2563eb; }

#expires {
  margin-top: 28px;
  padding-top: 14px;
  border-top: 1px solid #d5d8e0;
  color: #8a5a00;
  font-weight: 600;
}