:root {
  color-scheme: dark;
  --bg: #14161a;
  --bg-panel: #1b1e24;
  --bg-card: #21252c;
  --border: #2c313a;
  --text: #e6e8eb;
  --text-dim: #9aa1ac;
  --accent: #1fae63;
  --accent-dim: #17824a;
  --danger: #d1483f;
  --radius: 8px;
}

:root[data-theme="light"] {
  color-scheme: light;
  --bg: #f4f5f7;
  --bg-panel: #ffffff;
  --bg-card: #f0f1f4;
  --border: #dde0e5;
  --text: #1a1d21;
  --text-dim: #5b6270;
  --accent: #1fae63;
  --accent-dim: #17824a;
  --danger: #c0392b;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 14px;
}

#app { display: flex; flex-direction: column; height: 100vh; }
#app[hidden] { display: none; }

.login-screen {
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
}
.login-screen[hidden] { display: none; }
.login-form {
  width: 280px;
  padding: 2rem;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.login-brand { font-weight: 700; font-size: 1.4rem; color: var(--accent); text-align: center; }
.login-tagline { color: var(--text-dim); font-size: 0.85rem; text-align: center; margin: 0.25rem 0 1.25rem; }
.login-error { color: var(--danger); font-size: 0.8rem; min-height: 1.1rem; }
.logout-btn { margin-left: auto; }

#topbar {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  padding: 0.75rem 1.25rem;
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
#topbar .brand { font-weight: 700; font-size: 1.15rem; color: var(--accent); }
#topbar .tagline { color: var(--text-dim); font-size: 0.85rem; }
.conn-indicator { margin-left: auto; color: var(--danger); font-size: 0.9rem; }
.conn-indicator.live { color: var(--accent); }

#layout {
  flex: 1;
  display: grid;
  grid-template-columns: 260px 1fr 300px;
  min-height: 0;
}

#left-panel, #right-panel {
  background: var(--bg-panel);
  overflow-y: auto;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
#left-panel { border-right: 1px solid var(--border); }
#right-panel { border-left: 1px solid var(--border); }

#center-panel {
  overflow-y: auto;
  padding: 1rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  min-width: 0;
}

.panel-section { display: flex; flex-direction: column; gap: 0.5rem; }
.panel-section.grow { flex: 1; }
.panel-heading {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-dim);
  font-weight: 600;
}

#search {
  width: 100%;
  padding: 0.5rem 0.6rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
}

.group-tree { display: flex; flex-direction: column; gap: 0.3rem; overflow-y: auto; }
.group-header {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 0.6rem;
  border-radius: var(--radius);
  border: 1px solid transparent;
  background: var(--bg-card);
  cursor: pointer;
}
.group-header:hover { border-color: var(--border); }
.group-header.active { border-color: var(--accent); background: rgba(31, 174, 99, 0.12); }
.group-header .expand-arrow {
  width: 1.1rem;
  flex-shrink: 0;
  text-align: center;
  color: var(--text-dim);
  cursor: pointer;
  transition: transform 0.15s;
}
.group-header .expand-arrow.expanded { transform: rotate(90deg); }
.group-header .group-name {
  font-weight: 500;
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.group-header .group-count { color: var(--text-dim); font-size: 0.75rem; flex-shrink: 0; }
.group-members {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  padding-left: 1.5rem;
  margin-top: 0.15rem;
  margin-bottom: 0.15rem;
}

.device-list { display: flex; flex-direction: column; gap: 0.4rem; overflow-y: auto; }
.device-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.6rem;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  background: var(--bg-card);
}
.device-row:hover { border-color: var(--border); }
.device-row.selected { border-color: var(--accent); background: rgba(31, 174, 99, 0.12); }
.device-row .status-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--text-dim); flex-shrink: 0; }
.device-row .status-dot.online { background: var(--accent); }
.device-row .name-block { display: flex; flex-direction: column; min-width: 0; }
.device-row .name { font-weight: 500; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.device-row .host { font-size: 0.75rem; color: var(--text-dim); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.device-row .mode-badge {
  margin-left: auto;
  font-size: 0.65rem;
  text-transform: uppercase;
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  background: var(--bg);
  color: var(--text-dim);
  border: 1px solid var(--border);
  flex-shrink: 0;
}

#preview-box {
  background: #000;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  aspect-ratio: 16 / 9;
  max-height: 320px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-dim);
  text-align: center;
  padding: 1rem;
  overflow: hidden;
}
.preview-stream {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.tab-bar { display: flex; gap: 0.25rem; border-bottom: 1px solid var(--border); }
.tab-btn {
  background: none;
  border: none;
  color: var(--text-dim);
  padding: 0.6rem 1rem;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  font-size: 0.9rem;
}
.tab-btn.tab-active { color: var(--text); border-bottom-color: var(--accent); }

.tab-content { display: flex; flex-direction: column; gap: 1rem; }

.settings-card {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
}
.settings-card h3 { margin: 0 0 0.75rem; font-size: 0.85rem; color: var(--text-dim); text-transform: uppercase; letter-spacing: 0.04em; }

.field-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 0.75rem 1.25rem;
}
.field-grid label {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  font-size: 0.8rem;
  color: var(--text-dim);
}
.field-grid input, .field-grid select {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.4rem 0.5rem;
  color: var(--text);
  font-size: 0.85rem;
}
.field-grid input[type="checkbox"] { width: 1.1rem; height: 1.1rem; align-self: flex-start; }

.stacked-form { display: flex; flex-direction: column; gap: 0.6rem; }
.stacked-form label { display: flex; flex-direction: column; gap: 0.25rem; font-size: 0.8rem; color: var(--text-dim); }
.stacked-form input, .stacked-form select {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.4rem 0.5rem;
  color: var(--text);
}
.inline-label { display: flex; align-items: center; justify-content: space-between; font-size: 0.85rem; }
.inline-label select { background: var(--bg-card); border: 1px solid var(--border); border-radius: 6px; color: var(--text); padding: 0.3rem; }

.form-actions { display: flex; gap: 0.5rem; flex-wrap: wrap; }

.btn {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.5rem 0.8rem;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.85rem;
  text-align: center;
}
.btn:hover { border-color: var(--accent); }
.btn-primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-dim); }
.btn-danger { color: var(--danger); border-color: var(--danger); }
.btn-danger:hover { background: rgba(209, 72, 63, 0.12); }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }
.btn:disabled:hover { border-color: var(--border); }

.discovery-results { display: flex; flex-direction: column; gap: 0.4rem; }
.discovery-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.4rem 0.6rem;
  font-size: 0.8rem;
}
.discovery-item .host { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; color: var(--text-dim); }
.discovery-empty, .devices-empty { color: var(--text-dim); font-size: 0.8rem; }

.save-row { display: flex; align-items: center; gap: 0.75rem; }
.save-status { font-size: 0.8rem; color: var(--accent); opacity: 0; transition: opacity 0.2s; }
.save-status.visible { opacity: 1; }