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

:root {
  --bg: #0d1117;
  --card: #161b22;
  --border: #30363d;
  --text: #e6edf3;
  --muted: #8b949e;
  --blue: #58a6ff;
  --green: #3fb950;
  --orange: #e3b341;
  --red: #f85149;
  --purple: #bc8cff;
  --amber: #d29922;
  --cyan: #39d353;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 14px;
  min-height: 100vh;
}

/* ── Header ── */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  background: var(--card);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}
.header-left { display: flex; align-items: center; gap: 10px; }
.header h1 { font-size: 15px; font-weight: 600; letter-spacing: 0.3px; }
.header .subtitle { font-size: 11px; color: var(--muted); }

.live-badge {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  color: var(--muted);
  padding: 4px 10px;
  border-radius: 20px;
  border: 1px solid var(--border);
  transition: all 0.3s;
}
.live-badge.connected { color: var(--green); border-color: var(--green); }
.live-dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--muted);
}
.live-badge.connected .live-dot {
  background: var(--green);
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

/* ── Nav tabs ── */
.nav {
  display: flex;
  gap: 2px;
  padding: 8px 16px 0;
  background: var(--card);
  border-bottom: 1px solid var(--border);
}
.nav-tab {
  padding: 6px 14px;
  font-size: 13px;
  border-radius: 6px 6px 0 0;
  color: var(--muted);
  cursor: default;
  border: 1px solid transparent;
  border-bottom: none;
  margin-bottom: -1px;
}
.nav-tab.active {
  color: var(--text);
  background: var(--bg);
  border-color: var(--border);
}
.nav-tab.disabled { opacity: 0.4; cursor: not-allowed; }

/* ── Page ── */
.page { display: none; }
.page.active { display: block; }

/* ── Dashboard grid ── */
.dashboard {
  padding: 16px;
  display: grid;
  gap: 16px;
  grid-template-columns: 1fr;
}
@media (min-width: 640px) {
  .dashboard { grid-template-columns: 1fr 1fr; }
}
@media (min-width: 1024px) {
  .dashboard { grid-template-columns: 1fr 1fr 1fr; }
  .card.full-width { grid-column: 1 / -1; }
}

/* ── Card ── */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px;
  overflow: hidden;
}
.card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 10px;
}
.card-title {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--muted);
}
.card-value {
  font-size: 20px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}
.card-sub {
  font-size: 11px;
  color: var(--muted);
  margin-top: 2px;
}

.chart-wrap { position: relative; height: 140px; }

/* ── Legend chips ── */
.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 12px;
  margin-top: 8px;
}
.legend-item {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 11px;
  color: var(--muted);
}
.legend-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

/* ── Process table ── */
.proc-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}
.proc-table th {
  text-align: left;
  padding: 6px 8px;
  color: var(--muted);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-bottom: 1px solid var(--border);
}
.proc-table td {
  padding: 7px 8px;
  border-bottom: 1px solid #1c2128;
  font-variant-numeric: tabular-nums;
  max-width: 0;
}
.proc-table tr:last-child td { border-bottom: none; }
.proc-table .name-col {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 160px;
}
.ram-bar-wrap {
  display: flex;
  align-items: center;
  gap: 6px;
}
.ram-bar {
  flex: 1;
  height: 5px;
  background: var(--border);
  border-radius: 3px;
  overflow: hidden;
}
.ram-bar-fill {
  height: 100%;
  border-radius: 3px;
  background: var(--purple);
  transition: width 0.5s;
}
.rank-num {
  color: var(--muted);
  font-size: 12px;
  min-width: 18px;
}

/* ── Placeholder pages ── */
.placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 60vh;
  color: var(--muted);
  gap: 12px;
}
.placeholder svg { opacity: 0.3; }
.placeholder h2 { font-size: 18px; font-weight: 500; }
.placeholder p { font-size: 13px; }

/* ── Utility ── */
.text-blue   { color: var(--blue); }
.text-green  { color: var(--green); }
.text-orange { color: var(--orange); }
.text-red    { color: var(--red); }
.text-purple { color: var(--purple); }
.text-amber  { color: var(--amber); }
.text-cyan   { color: var(--cyan); }