:root {
  --bg: #f4f5f7;
  --card-bg: #ffffff;
  --border: #e5e7eb;
  --text: #1f2937;
  --muted: #6b7280;
  --primary: #2563eb;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.login-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px;
  width: 320px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.05);
}

.login-card h1 {
  margin: 0;
  font-size: 22px;
}

.login-card .subtitle {
  margin: 0 0 8px;
  color: var(--muted);
}

.login-card label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 14px;
  color: var(--muted);
}

.login-card input {
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 14px;
}

.login-card button {
  margin-top: 8px;
  padding: 10px;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: 6px;
  font-size: 14px;
  cursor: pointer;
}

.login-card button:disabled {
  opacity: 0.6;
  cursor: default;
}

.dashboard {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px;
}

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

.dashboard-header h1 {
  margin: 0;
}

.logout-btn {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 14px;
  cursor: pointer;
  color: var(--text);
  font-size: 14px;
}

.chart-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(420px, 1fr));
  gap: 20px;
}

.chart-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px;
}

.chart-card h2 {
  margin: 0 0 12px;
  font-size: 16px;
}

.chart-card canvas {
  max-height: 280px;
}

.empty-state,
.error-state {
  color: var(--muted);
  font-size: 14px;
}

.error-state {
  color: #dc2626;
}