* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #f5f7fb;
  color: #222;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 24px;
  background: #1f2937;
  color: white;
}

.topbar h1 {
  margin: 0;
  font-size: 24px;
}

.logout-link {
  color: white;
  text-decoration: none;
  font-weight: bold;
}

.cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  max-width: 900px;
  margin: 24px auto;
  padding: 0 16px;
}

.card {
  background: white;
  border-radius: 14px;
  padding: 20px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
  text-align: center;
}

.card h3 {
  margin-top: 0;
  margin-bottom: 10px;
}

.card p {
  margin: 0;
  font-size: 28px;
  font-weight: bold;
}

.controls-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  max-width: 900px;
  margin: 0 auto 24px;
  padding: 0 16px;
}

.panel {
  background: white;
  border-radius: 14px;
  padding: 20px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}

.panel h2 {
  margin-top: 0;
}

.panel label {
  display: block;
  margin-top: 12px;
  margin-bottom: 6px;
  font-weight: bold;
}

.panel select,
.login-card input {
  width: 100%;
  padding: 10px;
  border: 1px solid #ccc;
  border-radius: 8px;
}

button {
  padding: 12px 18px;
  border: none;
  border-radius: 8px;
  background: #2563eb;
  color: white;
  cursor: pointer;
  font-size: 16px;
  margin-top: 10px;
}

button:hover {
  background: #1d4ed8;
}

.chart-panel {
  max-width: 900px;
  margin: 0 auto 30px;
  padding: 0 16px;
}

.chart-panel canvas {
  background: white;
  border-radius: 14px;
  padding: 16px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}

.login-body {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #e5e7eb;
}

.login-card {
  width: 100%;
  max-width: 380px;
  background: white;
  padding: 24px;
  border-radius: 14px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}

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

.error-text {
  color: #dc2626;
  min-height: 20px;
}

@media (max-width: 768px) {
  .cards,
  .controls-grid {
    grid-template-columns: 1fr;
  }

  .topbar {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }
}