:root {
  --bg: #0a0c10;
  --bg-1: #101319;
  --bg-2: #171b22;
  --bg-3: #1f242d;
  --line: rgba(255, 255, 255, 0.08);
  --line-strong: rgba(255, 255, 255, 0.16);
  --text: #e9edf2;
  --text-2: #98a2b0;
  --text-3: #6a7480;
  --accent: #4c8dff;
  --accent-dim: rgba(76, 141, 255, 0.14);
  --ok: #35c07f;
  --warn: #f0a72c;
  --danger: #f0595c;
  --radius: 10px;
  --topbar-h: 56px;
  --sidebar-w: 312px;
  color-scheme: dark;
}

* { box-sizing: border-box; }

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 13px;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
}

button, input, textarea { font-family: inherit; font-size: inherit; }

/* ---------- topbar ---------- */

.topbar {
  height: var(--topbar-h);
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 0 14px;
  background: var(--bg-1);
  border-bottom: 1px solid var(--line);
}

.icon-btn {
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  border: 1px solid transparent;
  border-radius: 8px;
  background: transparent;
  color: var(--text-2);
  cursor: pointer;
  transition: 0.15s;
}
.icon-btn:hover { background: var(--bg-3); color: var(--text); }

.brand { display: flex; align-items: center; gap: 10px; }

.logo {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  display: grid;
  place-items: center;
  background: linear-gradient(145deg, #4c8dff, #2a5fd0);
  color: #fff;
  font-weight: 600;
  font-size: 12px;
  letter-spacing: 0.5px;
}

.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-text h1 { margin: 0; font-size: 14px; font-weight: 600; letter-spacing: 0.3px; }
.brand-text span { font-size: 11px; color: var(--text-3); }

.layouts {
  display: flex;
  gap: 3px;
  padding: 3px;
  background: var(--bg-2);
  border-radius: 9px;
  margin-left: 6px;
}

.layouts button {
  min-width: 34px;
  height: 26px;
  padding: 0 8px;
  border: 0;
  border-radius: 7px;
  background: transparent;
  color: var(--text-2);
  font-size: 12px;
  cursor: pointer;
  transition: 0.15s;
}
.layouts button:hover { color: var(--text); background: var(--bg-3); }
.layouts button.active { background: var(--accent); color: #fff; }

.spacer { flex: 1; }

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

.btn {
  height: 30px;
  padding: 0 12px;
  border-radius: 8px;
  border: 1px solid var(--line-strong);
  background: var(--bg-2);
  color: var(--text);
  cursor: pointer;
  transition: 0.15s;
  white-space: nowrap;
}
.btn:hover { background: var(--bg-3); border-color: rgba(255, 255, 255, 0.26); }
.btn:active { transform: translateY(1px); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.primary:hover { background: #5f9bff; }
.btn.tiny { height: 26px; padding: 0 9px; font-size: 12px; border-radius: 7px; }
.btn.danger { color: var(--danger); border-color: rgba(240, 89, 92, 0.35); }
.btn.danger:hover { background: rgba(240, 89, 92, 0.12); }
.btn.block { width: 100%; }

/* ---------- layout ---------- */

.layout-root {
  display: flex;
  height: calc(100vh - var(--topbar-h));
}

.sidebar {
  width: var(--sidebar-w);
  flex: 0 0 var(--sidebar-w);
  background: var(--bg-1);
  border-right: 1px solid var(--line);
  overflow-y: auto;
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.sidebar.hidden { display: none; }

.panel {
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 12px;
}
.panel h2 {
  margin: 0 0 10px;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-2);
  letter-spacing: 0.4px;
}
.panel-head { display: flex; align-items: center; justify-content: space-between; }
.panel-head h2 { margin-bottom: 10px; }

.count {
  font-size: 11px;
  color: var(--text-3);
  background: var(--bg-3);
  padding: 1px 7px;
  border-radius: 20px;
  margin-bottom: 10px;
}

#addForm { display: flex; flex-direction: column; gap: 7px; }

input[type="text"] {
  width: 100%;
  height: 32px;
  padding: 0 10px;
  border-radius: 8px;
  border: 1px solid var(--line-strong);
  background: var(--bg);
  color: var(--text);
  outline: none;
  transition: 0.15s;
}
input[type="text"]::placeholder { color: var(--text-3); }
input[type="text"]:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-dim); }

.hint {
  margin: 8px 0 0;
  font-size: 11px;
  line-height: 1.6;
  color: var(--text-3);
}

/* ---------- source list ---------- */

.src-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 4px; max-height: 42vh; overflow-y: auto; }

.src-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 8px;
  border-radius: 8px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: 0.12s;
}
.src-item:hover { background: var(--bg-3); }
.src-item.active { background: var(--accent-dim); border-color: rgba(76, 141, 255, 0.4); }
.src-item.dragging { opacity: 0.4; }
.src-item.drop-target { border-top: 2px solid var(--accent); }

.src-item .dot { flex: 0 0 auto; }

.src-info { min-width: 0; flex: 1; display: flex; flex-direction: column; gap: 1px; }
.src-name { font-size: 12px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.src-url { font-size: 10px; color: var(--text-3); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }

.src-remove {
  flex: 0 0 auto;
  width: 22px;
  height: 22px;
  display: grid;
  place-items: center;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: var(--text-3);
  cursor: pointer;
  opacity: 0;
  transition: 0.12s;
}
.src-item:hover .src-remove { opacity: 1; }
.src-remove:hover { background: rgba(240, 89, 92, 0.16); color: var(--danger); }

.row-actions { display: flex; gap: 6px; margin-top: 10px; }

.field { display: flex; flex-direction: column; gap: 5px; margin-bottom: 10px; }
.field > span { font-size: 11px; color: var(--text-3); }

.switch { display: flex; align-items: center; gap: 8px; padding: 4px 0; cursor: pointer; color: var(--text-2); }
.switch input { accent-color: var(--accent); width: 14px; height: 14px; cursor: pointer; }

/* ---------- stage / wall ---------- */

.stage {
  flex: 1;
  min-width: 0;
  position: relative;
  padding: 8px;
  background: var(--bg);
}

.wall {
  display: grid;
  grid-template-columns: repeat(var(--cols, 2), minmax(0, 1fr));
  grid-template-rows: repeat(var(--rows, 2), minmax(0, 1fr));
  gap: 8px;
  height: 100%;
  width: 100%;
}

.tile {
  position: relative;
  background: #000;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  min-width: 0;
  min-height: 0;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.tile.active { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent); }

.tile video {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
  background: #000;
}

.tile-top {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 7px 9px;
  background: linear-gradient(180deg, rgba(0, 0, 0, 0.72), rgba(0, 0, 0, 0));
  pointer-events: none;
}

.tile-name {
  font-size: 12px;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.8);
}

.tile-meta {
  position: absolute;
  left: 9px;
  bottom: 8px;
  font-size: 10px;
  color: rgba(255, 255, 255, 0.62);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.9);
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.15s;
}
.tile:hover .tile-meta { opacity: 1; }

.dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--text-3);
  flex: 0 0 auto;
  transition: background 0.2s;
}
.dot.playing { background: var(--ok); box-shadow: 0 0 0 3px rgba(53, 192, 127, 0.16); }
.dot.loading { background: var(--warn); animation: pulse 1.2s ease-in-out infinite; }
.dot.error, .dot.unsupported { background: var(--danger); }
.dot.buffering { background: var(--warn); }

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.28; }
}

.tile-ctrl {
  position: absolute;
  right: 8px;
  bottom: 8px;
  display: flex;
  gap: 2px;
  padding: 3px;
  border-radius: 8px;
  background: rgba(12, 14, 18, 0.78);
  border: 1px solid rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(6px);
  opacity: 0;
  transform: translateY(3px);
  transition: 0.15s;
}
.tile:hover .tile-ctrl { opacity: 1; transform: translateY(0); }

.tile-ctrl button {
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: rgba(255, 255, 255, 0.78);
  cursor: pointer;
  transition: 0.12s;
}
.tile-ctrl button:hover { background: rgba(255, 255, 255, 0.14); color: #fff; }
.tile-ctrl button.on { color: var(--accent); }

.tile-loading {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  background: rgba(0, 0, 0, 0.35);
  transition: opacity 0.25s;
}
.tile-loading.hide { opacity: 0; pointer-events: none; }

.spinner {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, 0.18);
  border-top-color: var(--accent);
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.tile-error {
  position: absolute;
  inset: 0;
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 18px;
  text-align: center;
  background: rgba(8, 10, 14, 0.86);
}
.tile-error.show { display: flex; }
.tile-error p { margin: 0; font-size: 12px; line-height: 1.6; color: var(--text-2); max-width: 420px; white-space: pre-line; }
.tile-error .err-title { font-size: 12px; color: var(--danger); font-weight: 500; }

.tile-tap {
  position: absolute;
  inset: 0;
  display: none;
  place-items: center;
  background: rgba(0, 0, 0, 0.5);
  cursor: pointer;
}
.tile-tap.show { display: grid; }
.tile-tap span {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 9px 16px;
  border-radius: 30px;
  background: rgba(0, 0, 0, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.18);
  font-size: 12px;
}

.tile-placeholder {
  display: grid;
  place-items: center;
  border: 1px dashed var(--line-strong);
  background: rgba(255, 255, 255, 0.012);
  border-radius: var(--radius);
  cursor: pointer;
  color: var(--text-3);
  transition: 0.15s;
}
.tile-placeholder:hover { border-color: var(--accent); color: var(--accent); background: var(--accent-dim); }
.tile-placeholder svg { opacity: 0.8; }

/* ---------- empty state ---------- */

.empty-state {
  position: absolute;
  inset: 8px;
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  text-align: center;
  border: 1px dashed var(--line-strong);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.012);
}
.empty-state.show { display: flex; }
.empty-icon { color: var(--text-3); margin-bottom: 2px; }
.empty-state h3 { margin: 0; font-size: 14px; font-weight: 500; }
.empty-state p { margin: 0 0 6px; font-size: 12px; color: var(--text-3); }

/* ---------- toasts ---------- */

.toasts {
  position: fixed;
  left: 50%;
  bottom: 26px;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  gap: 6px;
  z-index: 100;
  pointer-events: none;
}

.toast {
  padding: 8px 14px;
  border-radius: 8px;
  background: rgba(28, 32, 40, 0.96);
  border: 1px solid var(--line-strong);
  font-size: 12px;
  color: var(--text);
  animation: toast-in 0.2s ease-out;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.4);
}
.toast.err { border-color: rgba(240, 89, 92, 0.5); color: #ffc9c9; }

@keyframes toast-in {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---------- scrollbars ---------- */

::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-thumb { background: rgba(255, 255, 255, 0.12); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: rgba(255, 255, 255, 0.2); }
::-webkit-scrollbar-track { background: transparent; }

/* ---------- responsive ---------- */

@media (max-width: 900px) {
  .sidebar {
    position: absolute;
    top: var(--topbar-h);
    bottom: 0;
    left: 0;
    z-index: 30;
    box-shadow: 20px 0 40px rgba(0, 0, 0, 0.5);
  }
  .brand-text, .layouts { display: none; }
}