:root {
  --bg: #f5f7fb;
  --card-bg: #ffffff;
  --panel-bg: #ffffff;
  --primary: #2563eb;
  --accent: #fb923c;
  --text: #1f2937;
  --muted: #4b5563;
  --shadow: 0 24px 45px rgba(15, 23, 42, 0.08);
  --border: rgba(15, 23, 42, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  height: 100vh;
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: radial-gradient(circle at 15% 20%, rgba(37, 99, 235, 0.12), transparent 55%),
    radial-gradient(circle at 75% 10%, rgba(251, 146, 60, 0.18), transparent 55%),
    var(--bg);
  color: var(--text);
  padding: 2.5rem clamp(2rem, 5vw, 4rem);
  display: flex;
  flex-direction: column;
  gap: 2rem;
  overflow: hidden;
}

.site-footer {
  text-align: center;
  color: var(--muted);
  font-size: 0.9rem;
}

.site-footer p {
  margin: 0;
}

.page-header {
  display: grid;
  gap: 0.5rem;
  text-align: left;
  align-content: start;
}

.title-block {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.page-header h1 {
  margin: 0;
  font-size: clamp(2.4rem, 4vw, 3.8rem);
  letter-spacing: 0.01em;
}

.page-header h2 {
  margin: 0;
  font-size: clamp(1.1rem, 1.8vw, 1.5rem);
  font-weight: 500;
  color: var(--muted);
}

.lead {
  margin: 0;
  font-size: 1rem;
  color: var(--muted);
}

.timestamp {
  margin: 0;
  font-size: 0.95rem;
  color: var(--muted);
}

.timestamp span {
  font-weight: 600;
  color: var(--primary);
}

.dashboard {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 2rem;
  min-height: 0;
}

.stats-section {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.stat-grid {
  display: grid;
  gap: 1.2rem;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  min-height: 0;
}

.stat-card {
  background: var(--panel-bg);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 1.5rem;
  box-shadow: var(--shadow);
  display: grid;
  gap: 0.5rem;
}

.stat-card h3 {
  margin: 0;
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.stat-value {
  font-size: clamp(2rem, 2.3vw + 1rem, 3.1rem);
  font-weight: 700;
  color: var(--primary);
}

.stat-subtext {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.overview-grid {
  display: grid;
  gap: 1.2rem;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.overview-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 1.6rem;
  box-shadow: var(--shadow);
  display: grid;
  gap: 0.75rem;
}

.overview-card h3 {
  margin: 0;
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.overview-value {
  margin: 0;
  font-size: clamp(1.8rem, 1.6vw + 1.2rem, 2.8rem);
  font-weight: 700;
  color: var(--text);
}

.overview-subtext {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.charts-row {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  flex: 1;
  min-height: 0;
}

.chart-card {
  background: var(--panel-bg);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 1.5rem 1.75rem;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 1rem;
  flex: 1 1 0;
  min-height: 420px;
}

.chart-card__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.chart-card h3 {
  margin: 0;
  font-size: 1.1rem;
  font-weight: 600;
}

.chart-card canvas {
  width: 100% !important;
  height: 100% !important;
  max-height: none;
  min-height: 320px;
}

.chart-empty {
  margin: auto;
  color: var(--muted);
  font-style: italic;
}

.loading,
.error {
  text-align: center;
  color: var(--muted);
  font-size: 1rem;
}

.error {
  color: #f87171;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 720px) {
  body {
    padding: 2rem 1.25rem;
    height: auto;
    overflow: auto;
  }

  .dashboard {
    gap: 1.75rem;
  }

  .stat-grid {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  }

  .overview-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .charts-row {
    grid-template-columns: 1fr;
  }

  .chart-card canvas {
    max-height: 260px;
  }
}

@media (max-width: 1200px) {
  .overview-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .stat-grid {
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  }
}