/* C2 管理端 - 深色主题 */
:root {
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-tertiary: #21262d;
  --border: #30363d;
  --text-primary: #e6edf3;
  --text-secondary: #8b949e;
  --accent: #58a6ff;
  --accent-hover: #79b8ff;
  --success: #3fb950;
  --warning: #d29922;
  --danger: #f85149;
  --sidebar-width: 220px;
  --topbar-height: 52px;
}

* { box-sizing: border-box; }
body { margin: 0; font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; background: var(--bg-primary); color: var(--text-primary); min-height: 100vh; }

.layout { display: flex; min-height: 100vh; }
.sidebar { width: var(--sidebar-width); background: var(--bg-secondary); border-right: 1px solid var(--border); padding: 16px 0; flex-shrink: 0; }
.sidebar-brand { padding: 0 16px 16px; font-weight: 700; font-size: 1.1rem; color: var(--text-primary); border-bottom: 1px solid var(--border); margin-bottom: 12px; }
.sidebar-brand small { display: block; font-size: 0.7rem; color: var(--text-secondary); font-weight: 400; }
.sidebar-nav { list-style: none; padding: 0; margin: 0; }
.sidebar-nav a { display: flex; align-items: center; gap: 10px; padding: 10px 16px; color: var(--text-secondary); text-decoration: none; transition: color .15s, background .15s; }
.sidebar-nav a:hover { color: var(--text-primary); background: var(--bg-tertiary); }
.sidebar-nav a.active { color: var(--accent); background: var(--bg-tertiary); }
.sidebar-nav .badge { margin-left: auto; background: var(--bg-tertiary); padding: 2px 8px; border-radius: 10px; font-size: 0.75rem; }
.sidebar-user { padding: 12px 16px; border-top: 1px solid var(--border); margin-top: auto; font-size: 0.85rem; color: var(--text-secondary); }

.main { flex: 1; display: flex; flex-direction: column; min-width: 0; }
.topbar { height: var(--topbar-height); background: var(--bg-secondary); border-bottom: 1px solid var(--border); display: flex; align-items: center; justify-content: space-between; padding: 0 20px; flex-shrink: 0; }
.topbar-title { font-size: 0.95rem; color: var(--text-secondary); }
.topbar-metrics { display: flex; gap: 20px; font-size: 0.8rem; color: var(--text-secondary); }
.topbar-metrics span { color: var(--success); }
.topbar-time { font-size: 0.85rem; color: var(--text-secondary); }

.content { flex: 1; padding: 20px; overflow: auto; }

/* 仪表盘 */
.dash-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 16px; margin-bottom: 24px; }
.card { background: var(--bg-secondary); border: 1px solid var(--border); border-radius: 8px; padding: 16px; }
.card h3 { margin: 0 0 4px; font-size: 0.8rem; color: var(--text-secondary); font-weight: 500; }
.card .value { font-size: 1.75rem; font-weight: 700; }
.card .sub { font-size: 0.75rem; color: var(--text-secondary); margin-top: 4px; }
.card.primary .value { color: var(--accent); }
.card.success .value { color: var(--success); }
.card.warning .value { color: var(--warning); }
.card.danger .value { color: var(--danger); }

.chart-placeholder { background: var(--bg-secondary); border: 1px solid var(--border); border-radius: 8px; height: 200px; display: flex; align-items: center; justify-content: center; color: var(--text-secondary); margin-bottom: 24px; }

/* 设备列表 */
.toolbar { display: flex; gap: 12px; align-items: center; margin-bottom: 16px; flex-wrap: wrap; }
.toolbar input { padding: 8px 12px; border: 1px solid var(--border); border-radius: 6px; background: var(--bg-tertiary); color: var(--text-primary); width: 220px; }
.toolbar input::placeholder { color: var(--text-secondary); }
.toolbar .filters { display: flex; gap: 6px; }
.toolbar button { padding: 8px 14px; border: 1px solid var(--border); border-radius: 6px; background: var(--bg-tertiary); color: var(--text-primary); cursor: pointer; font-size: 0.85rem; }
.toolbar button:hover { background: var(--border); }
.toolbar button.active { background: var(--accent); border-color: var(--accent); color: #fff; }

.table-wrap { overflow: auto; border: 1px solid var(--border); border-radius: 8px; background: var(--bg-secondary); }
table { width: 100%; border-collapse: collapse; min-width: 800px; }
th, td { padding: 10px 12px; text-align: left; border-bottom: 1px solid var(--border); }
th { font-size: 0.75rem; color: var(--text-secondary); font-weight: 500; text-transform: uppercase; }
tr:last-child td { border-bottom: none; }
tr:hover td { background: var(--bg-tertiary); }
.status-dot { width: 8px; height: 8px; border-radius: 50%; display: inline-block; margin-right: 6px; }
.status-dot.online { background: var(--success); }
.status-dot.offline { background: var(--text-secondary); }
.status-dot.abnormal { background: var(--warning); }
.actions-cell { display: flex; gap: 8px; }
.btn { padding: 6px 12px; border-radius: 6px; border: none; cursor: pointer; font-size: 0.8rem; text-decoration: none; display: inline-flex; align-items: center; }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-hover); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { filter: brightness(1.1); }
.pagination { margin-top: 16px; display: flex; align-items: center; gap: 12px; font-size: 0.85rem; color: var(--text-secondary); }
.pagination button { padding: 6px 12px; border: 1px solid var(--border); border-radius: 6px; background: var(--bg-tertiary); color: var(--text-primary); cursor: pointer; }
.pagination button:disabled { opacity: 0.5; cursor: not-allowed; }

/* 设备控制页 */
.control-layout { display: grid; grid-template-columns: 280px 1fr 320px; gap: 16px; height: calc(100vh - var(--topbar-height) - 40px); min-height: 400px; }
.control-sidebar { background: var(--bg-secondary); border: 1px solid var(--border); border-radius: 8px; padding: 16px; overflow: auto; }
.control-sidebar h4 { margin: 0 0 12px; font-size: 0.9rem; }
.device-meta { font-size: 0.8rem; color: var(--text-secondary); }
.device-meta p { margin: 4px 0; display: flex; justify-content: space-between; gap: 8px; }
.device-meta .k { color: var(--text-secondary); }
.device-meta .v { color: var(--text-primary); word-break: break-all; }
.cmd-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-top: 12px; }
.cmd-grid .btn { justify-content: center; }
.control-main { background: var(--bg-secondary); border: 1px solid var(--border); border-radius: 8px; padding: 16px; overflow: auto; display: flex; flex-direction: column; }
.screen-mirror { flex: 1; min-height: 200px; background: var(--bg-primary); border-radius: 6px; display: flex; align-items: center; justify-content: center; color: var(--text-secondary); font-size: 0.9rem; position: relative; }
.screen-mirror .screen-placeholder { padding: 24px; }
.screen-mirror #screen-mirror-img { display: none; }
.control-panel { background: var(--bg-secondary); border: 1px solid var(--border); border-radius: 8px; padding: 16px; overflow: hidden; display: flex; flex-direction: column; }
.control-panel h4 { margin: 0 0 12px; font-size: 0.9rem; }
.quick-actions { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 12px; }
.log-panel { flex: 1; min-height: 180px; background: var(--bg-primary); border-radius: 6px; padding: 10px; font-family: monospace; font-size: 0.75rem; overflow: auto; }
.log-panel .entry { margin-bottom: 4px; color: var(--text-secondary); }
.log-panel .entry time { margin-right: 8px; color: var(--text-secondary); }
.log-panel .entry.error { color: var(--danger); }
.log-panel .entry.cmd { color: var(--accent); }

.empty { color: var(--text-secondary); text-align: center; padding: 40px 20px; }
.page { display: none; }
.page.active { display: block; }

@media (max-width: 1200px) {
  .control-layout { grid-template-columns: 1fr 1fr; }
  .control-main { grid-column: 1 / -1; min-height: 200px; }
}