:root {
  --bg: #0b0d12;
  --panel: #141824;
  --panel-2: #1b2130;
  --text: #e8ecf4;
  --muted: #8b93a7;
  --accent: #ff5c39;
  --accent-2: #ffb35c;
  --border: #262d40;
  --radius: 10px;
  font-size: 15px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 16px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}

.logo {
  font-weight: 800;
  letter-spacing: 0.5px;
  color: var(--accent);
  text-decoration: none;
  font-size: 1.1rem;
}
.logo span { color: var(--text); }

.source-form {
  display: flex;
  gap: 8px;
  flex: 1;
  min-width: 260px;
}

#source-input {
  flex: 1;
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: var(--radius);
  padding: 8px 12px;
  outline: none;
}
#source-input:focus { border-color: var(--accent); }

.btn {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  padding: 8px 14px;
  font-weight: 600;
  cursor: pointer;
}
.btn:hover { filter: brightness(1.1); }
.btn.ghost {
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--text);
}

.layout-switch { display: flex; gap: 4px; }
.layout-switch button {
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--muted);
  border-radius: 8px;
  padding: 7px 10px;
  cursor: pointer;
  font-size: 0.85rem;
}
.layout-switch button.active {
  color: var(--text);
  border-color: var(--accent);
}

#channel-name {
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: var(--radius);
  padding: 8px 12px;
  width: 160px;
  outline: none;
}

#rotate-select {
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 8px;
  padding: 7px 8px;
}

main { flex: 1; display: flex; min-height: 0; }

#canvas {
  flex: 1;
  display: grid;
  gap: 8px;
  padding: 8px;
  min-height: 0;
  grid-auto-rows: 1fr;
}

/* Layouts */
#canvas[data-layout="grid"] { grid-template-columns: repeat(auto-fit, minmax(340px, 1fr)); }
#canvas[data-layout="split"] { grid-template-columns: 1fr 1fr; }
#canvas[data-layout="theater"] { grid-template-columns: 1fr; }
#canvas[data-layout="theater"] .tile:not(.focused) { display: none; }
#canvas[data-layout="focus"] {
  grid-template-columns: 3fr 1fr;
  /* --rail-rows is set from JS: number of non-focused tiles (min 1) */
  grid-template-rows: repeat(var(--rail-rows, 1), minmax(0, 1fr));
}
#canvas[data-layout="focus"] .tile.focused {
  grid-column: 1;
  grid-row: 1 / -1;
}
#canvas[data-layout="focus"] .tile:not(.focused) { grid-column: 2; }

.tile {
  position: relative;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  min-height: 0;
}
.tile.focused { border-color: var(--accent); }

.tile-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 4px 8px;
  background: var(--panel-2);
  font-size: 0.78rem;
  color: var(--muted);
}
.tile-label { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.tile-controls { display: flex; gap: 4px; }

.icon-btn {
  background: none;
  border: none;
  color: var(--muted);
  cursor: pointer;
  font-size: 0.85rem;
  padding: 2px 4px;
}
.icon-btn:hover { color: var(--text); }

.tile iframe {
  flex: 1;
  width: 100%;
  border: 0;
  min-height: 0;
}

.linkout {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 20px;
  text-align: center;
  background: radial-gradient(circle at 50% 30%, #1c2233, var(--panel));
}
.linkout-brand { font-size: 1.4rem; font-weight: 700; }
.linkout-note { color: var(--muted); font-size: 0.85rem; max-width: 260px; }

#empty-state {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  color: var(--muted);
  pointer-events: none;
}
#empty-state .hint { font-size: 0.9rem; max-width: 420px; text-align: center; }
#empty-state .big { font-size: 1.5rem; color: var(--text); font-weight: 700; }

aside {
  width: 220px;
  background: var(--panel);
  border-left: 1px solid var(--border);
  padding: 12px;
  overflow-y: auto;
}
aside h3 { margin: 0 0 8px; font-size: 0.8rem; text-transform: uppercase; color: var(--muted); }
#saved-channels { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 6px; }
#saved-channels li { display: flex; align-items: center; gap: 4px; }
.saved-open {
  flex: 1;
  text-align: left;
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 8px;
  padding: 7px 10px;
  cursor: pointer;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.saved-open:hover { border-color: var(--accent); }

#toast {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%) translateY(80px);
  background: var(--panel-2);
  border: 1px solid var(--accent);
  color: var(--text);
  padding: 10px 18px;
  border-radius: var(--radius);
  transition: transform 0.25s ease;
  z-index: 50;
}
#toast.show { transform: translateX(-50%) translateY(0); }

@media (max-width: 760px) {
  aside { display: none; }
  #canvas[data-layout="focus"], #canvas[data-layout="split"] {
    grid-template-columns: 1fr;
    grid-template-rows: none;
  }
  #canvas[data-layout="focus"] .tile.focused { grid-column: auto; grid-row: auto; }
  #canvas[data-layout="focus"] .tile:not(.focused) { grid-column: auto; }
}