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

body {
  background: #0f0f1a;
  color: #c0c0d0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 14px;
  line-height: 1.5;
  min-height: 100vh;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 20px 16px 40px;
}

.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}

.header h1 {
  font-size: 20px;
  font-weight: 600;
  color: #e0e0f0;
  letter-spacing: 0.3px;
}

.update-time {
  font-size: 12px;
  color: #70708a;
}

.cards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-bottom: 24px;
}

.card {
  background: #1a1a2e;
  border-radius: 10px;
  padding: 18px 16px;
  border: 1px solid #2a2a3e;
  transition: border-color 0.2s;
}

.card--cpu { border-left: 3px solid #4fc3f7; }
.card--mem { border-left: 3px solid #81c784; }
.card--fpm { border-left: 3px solid #ffb74d; }
.card--fpm-err { border-left: 3px solid #ce93d8; }

.card__label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: #70708a;
  margin-bottom: 6px;
}

.card__value {
  font-size: 28px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.card--cpu .card__value { color: #4fc3f7; }
.card--mem .card__value { color: #81c784; }
.card--fpm .card__value { color: #ffb74d; }
.card--fpm-err .card__value { color: #ce93d8; }

.period-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.period-label {
  font-size: 12px;
  color: #70708a;
  margin-right: 4px;
}

.period-btn {
  background: #1a1a2e;
  color: #80809a;
  border: 1px solid #2a2a3e;
  border-radius: 6px;
  padding: 6px 14px;
  font-size: 12px;
  cursor: pointer;
  transition: all 0.15s;
}

.period-btn:hover {
  background: #2a2a3e;
  color: #c0c0d0;
}

.period-btn.active {
  background: #4fc3f7;
  color: #0f0f1a;
  border-color: #4fc3f7;
  font-weight: 600;
}

.charts {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.chart-box {
  background: #1a1a2e;
  border-radius: 10px;
  padding: 16px;
  border: 1px solid #2a2a3e;
}

.chart-title {
  font-size: 13px;
  font-weight: 500;
  color: #9090aa;
  margin-bottom: 10px;
}

.chart-wrap {
  position: relative;
  height: 180px;
}

@media (max-width: 640px) {
  .cards {
    grid-template-columns: repeat(2, 1fr);
  }
  .chart-wrap {
    height: 140px;
  }
  .header h1 {
    font-size: 17px;
  }
  .card__value {
    font-size: 22px;
  }
}