*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --font:      'IBM Plex Sans', system-ui, sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;
  --bg:          #0d1117;
  --bg-surface:  #161b22;
  --bg-raised:   #1c2330;
  --bg-hover:    #21293a;
  --border:      rgba(255,255,255,0.07);
  --border-em:   rgba(255,255,255,0.14);
  --text:        #e6edf3;
  --text-2:      #8b949e;
  --text-3:      #484f58;
  --blue:   #58a6ff;
  --green:  #3fb950;
  --red:    #f85149;
  --amber:  #e3b341;
  --purple: #a371f7;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
}

html { font-size: 15px; }
body { font-family: var(--font); background: var(--bg); color: var(--text); min-height: 100vh; }

/* ── Topbar ── */
.topbar {
  position: sticky; top: 0; z-index: 50;
  background: rgba(13,17,23,0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 28px; height: 60px; gap: 16px; flex-wrap: wrap;
}
.topbar-left { display: flex; align-items: center; gap: 12px; }
.topbar-right { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }

.ms-logo { display: grid; grid-template-columns: 1fr 1fr; gap: 2px; width: 22px; height: 22px; flex-shrink: 0; }
.ms-sq { display: block; border-radius: 1px; }
.ms-sq--tl { background: #f25022; }
.ms-sq--tr { background: #7fba00; }
.ms-sq--bl { background: #00a4ef; }
.ms-sq--br { background: #ffb900; }

.brand-title { font-size: 14px; font-weight: 600; color: var(--text); }
.brand-sub   { font-size: 10px; color: var(--text-3); letter-spacing: 0.04em; text-transform: uppercase; }

.connection-status { display: flex; align-items: center; gap: 6px; font-size: 12px; color: var(--text-2); }
.status-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--text-3); flex-shrink: 0; transition: background 0.3s; }
.status-dot.ok   { background: var(--green); box-shadow: 0 0 0 3px rgba(63,185,80,0.2); }
.status-dot.err  { background: var(--red);   box-shadow: 0 0 0 3px rgba(248,81,73,0.2); }
.status-dot.warn { background: var(--amber); }

.range-tabs { display: flex; gap: 3px; background: var(--bg-surface); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 3px; }
.range-tab { padding: 4px 11px; border-radius: 4px; border: none; background: transparent; color: var(--text-2); font-size: 12px; font-family: var(--font-mono); font-weight: 500; cursor: pointer; transition: all 0.15s; }
.range-tab:hover { color: var(--text); }
.range-tab.active { background: var(--bg-raised); color: var(--blue); }

.refresh-btn { display: flex; align-items: center; gap: 6px; padding: 6px 12px; border-radius: var(--radius-sm); border: 1px solid var(--border-em); background: transparent; color: var(--text-2); font-size: 12px; font-family: var(--font); cursor: pointer; transition: all 0.15s; }
.refresh-btn:hover { background: var(--bg-hover); color: var(--text); }
.refresh-btn.spinning i { animation: spin 0.8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

.last-refresh { font-size: 10px; color: var(--text-3); font-family: var(--font-mono); white-space: nowrap; }

/* ── Error banner ── */
.error-banner { margin: 12px 28px 0; padding: 10px 16px; border-radius: var(--radius-md); background: rgba(248,81,73,0.1); border: 1px solid rgba(248,81,73,0.3); color: #ff7b72; font-size: 13px; display: flex; align-items: center; gap: 10px; }

/* ── Main ── */
.main { padding: 24px 28px 48px; max-width: 1400px; }

/* ── Section headers ── */
.section-header {
  display: flex; align-items: center; gap: 8px;
  font-size: 13px; font-weight: 600; color: var(--text);
  margin: 24px 0 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}
.section-header:first-child { margin-top: 0; }
.section-header i { font-size: 13px; color: var(--text-2); }
.section-source { font-size: 11px; font-weight: 400; color: var(--text-3); margin-left: 4px; }

/* ── Skeleton ── */
@keyframes shimmer { 0% { background-position: -400px 0; } 100% { background-position: 400px 0; } }
.skeleton-card { height: 88px; border-radius: var(--radius-md); background: linear-gradient(90deg, var(--bg-surface) 25%, var(--bg-raised) 50%, var(--bg-surface) 75%); background-size: 800px 100%; animation: shimmer 1.5s infinite; }

/* ── Metric cards ── */
.metric-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 10px; margin-bottom: 4px; }

.metric-card { background: var(--bg-surface); border: 1px solid var(--border); border-radius: var(--radius-md); padding: 16px; position: relative; overflow: hidden; transition: border-color 0.2s; }
.metric-card:hover { border-color: var(--border-em); }
.metric-card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px; }
.metric-card.color-blue::before   { background: var(--blue); }
.metric-card.color-red::before    { background: var(--red); }
.metric-card.color-amber::before  { background: var(--amber); }
.metric-card.color-green::before  { background: var(--green); }
.metric-card.color-purple::before { background: var(--purple); }

.metric-icon { font-size: 13px; margin-bottom: 8px; opacity: 0.7; }
.metric-card.color-blue   .metric-icon { color: var(--blue); }
.metric-card.color-red    .metric-icon { color: var(--red); }
.metric-card.color-amber  .metric-icon { color: var(--amber); }
.metric-card.color-green  .metric-icon { color: var(--green); }
.metric-card.color-purple .metric-icon { color: var(--purple); }

.metric-label { font-size: 10px; color: var(--text-3); text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 4px; }
.metric-value { font-size: 26px; font-weight: 500; font-family: var(--font-mono); color: var(--text); line-height: 1; }
.metric-delta { margin-top: 7px; font-size: 11px; color: var(--text-3); display: flex; align-items: center; gap: 3px; }
.delta-up   { color: var(--red); }
.delta-down { color: var(--green); }

/* ── Charts ── */
.chart-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-top: 20px; }
.chart-card { background: var(--bg-surface); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 18px; }
.chart-card:hover { border-color: var(--border-em); }
.chart-title { font-size: 13px; font-weight: 600; color: var(--text); }
.chart-sub   { font-size: 11px; color: var(--text-3); margin-top: 2px; margin-bottom: 12px; }
.chart-wrap  { position: relative; width: 100%; }

/* ── Responsive ── */
@media (max-width: 1100px) { .chart-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 700px)  { .chart-grid { grid-template-columns: 1fr; } .topbar { height: auto; padding: 12px 16px; } .main { padding: 16px; } }