:root {
  --bg: #0b0b0b;
  --panel: #151515;
  --text: #eaeaea;
  --muted: #9aa0a6;
  --accent: #3a86ff;
  --border: #262626;
}

* { box-sizing: border-box; }

html, body {
  height: 100%;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}

/* Header */
header {
  position: sticky;
  top: 0;
  z-index: 10; /* below .box.fullscreen (z 9999) */
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 16px 20px;
  background: linear-gradient(180deg, rgba(15,15,15,0.98), rgba(15,15,15,0.94));
  border-bottom: 1px solid var(--border);
  backdrop-filter: saturate(140%) blur(6px);
}

header .left,
header .right {
  color: var(--muted);
  font-size: 14px;
  white-space: nowrap;
}

header .right { text-align: right; }

/* Make both lines same font, weight, and color (thin) */
header .title,
header .sub { color: inherit; font-weight: 300; }
header .sub { font-size: inherit; }

header .center {
  text-align: center;
  flex: 1;
  font-weight: 500;
}

header .center span {
  display: inline-block;
  font-size: 12px;
  color: var(--muted);
}

main.container {
  max-width: 1200px;
  margin: 24px auto;
  padding: 0 16px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 16px;
}

.box {
  border: 1px solid var(--border);
  background: var(--panel);
  border-radius: 10px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  min-height: 260px;
}

/* Indicate clickability in grid view */
.box { cursor: pointer; }
.box.fullscreen { cursor: default; }

.box-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
}

.box-header h2 {
  margin: 0;
  font-size: 16px;
  font-weight: 600;
}

.box-actions { display: flex; gap: 8px; }

.box-actions .btn-expand,
.box-actions .btn-minimize {
  appearance: none;
  border: 1px solid var(--border);
  background: #1f1f1f;
  color: var(--text);
  padding: 6px 10px;
  border-radius: 8px;
  font-size: 12px;
  cursor: pointer;
}

.box-actions button:hover { border-color: var(--accent); }

.box-body {
  position: relative;
  /* Minimum height ensures placeholder is visible when iframe src is empty */
  min-height: 220px; /* ~16:11 of 320px min column width */
}

.box-body iframe {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 11; /* maintain 16:11 in grid view */
  border: 0;
  display: block;
  background: #0e0e0e;
}

/* Thumbnail behavior for boxes that prefer an image in grid view */
.box.use-thumb .box-body {
  display: grid;
}
.box.use-thumb .box-body .thumb {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 11;
  display: block;
  object-fit: cover;
  background: #0e0e0e;
}
.box.use-thumb .box-body iframe {
  display: none; /* hide iframe in grid view */
}
.box.use-thumb.fullscreen .box-body .thumb {
  display: none; /* hide thumbnail in fullscreen */
}
.box.use-thumb.fullscreen .box-body iframe {
  display: block; /* show iframe in fullscreen */
}

.box.fullscreen {
  position: fixed;
  inset: 8px;
  z-index: 9999;
  margin: 0;
  border-radius: 10px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.6);
}

.box.fullscreen .box-body { flex: 1; }
.box.fullscreen .box-body iframe {
  height: 100%;
  aspect-ratio: auto; /* allow iframe to use full height in fullscreen */
}

.placeholder {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  color: var(--muted);
  font-size: 14px;
  pointer-events: none;
}