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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: #f8f9fa;
  color: #212529;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  background: #0a9396;
  color: #fff;
  padding: 24px 32px;
}

header {
  position: relative;
}

header h1 {
  font-size: 1.5rem;
  font-weight: 600;
}

header .subtitle {
  font-size: 0.875rem;
  opacity: 0.85;
  margin-top: 4px;
}

.logout-btn {
  position: absolute;
  top: 24px;
  right: 32px;
  background: rgba(255, 255, 255, 0.15);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.4);
  border-radius: 6px;
  padding: 6px 14px;
  font-size: 0.8rem;
  cursor: pointer;
}

.logout-btn:hover {
  background: rgba(255, 255, 255, 0.25);
}

main {
  max-width: 720px;
  margin: 32px auto;
  padding: 0 24px;
  flex: 1;
  width: 100%;
}

.stats-cards {
  display: flex;
  gap: 16px;
  margin-bottom: 32px;
}

.card {
  flex: 1;
  background: #fff;
  border-radius: 12px;
  padding: 24px;
  text-align: center;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

.card-value {
  display: block;
  font-size: 2.5rem;
  font-weight: 700;
  color: #0a9396;
}

.card-label {
  display: block;
  font-size: 0.875rem;
  color: #6c757d;
  margin-top: 4px;
}

.chart-section {
  background: #fff;
  border-radius: 12px;
  padding: 24px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

.chart-section h2 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.chart-hint {
  font-size: 0.8rem;
  color: #6c757d;
  margin-bottom: 20px;
}

/* D3 bar styles */
.bar-group text.label {
  font-size: 13px;
  fill: #6c757d;
}

.bar-group text.value {
  font-size: 13px;
  font-weight: 600;
  fill: #212529;
}

.bar-group rect.track {
  fill: #dee2e6;
  rx: 6;
}

.bar-group rect.fill {
  rx: 6;
}

.hidden {
  display: none;
}

#no-data {
  text-align: center;
  padding: 32px;
  color: #6c757d;
  font-size: 0.95rem;
}

/* Login */
.login-card {
  max-width: 360px;
  margin: 0 auto;
  background: #fff;
  border-radius: 12px;
  padding: 32px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

.login-card h2 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 20px;
}

.login-card label {
  display: block;
  font-size: 0.8rem;
  font-weight: 500;
  color: #6c757d;
  margin-bottom: 4px;
  margin-top: 12px;
}

.login-card input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid #dee2e6;
  border-radius: 8px;
  font-size: 0.95rem;
  outline: none;
}

.login-card input:focus {
  border-color: #0a9396;
  box-shadow: 0 0 0 2px rgba(10, 147, 150, 0.15);
}

.login-card button {
  width: 100%;
  margin-top: 20px;
  padding: 10px;
  background: #0a9396;
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
}

.login-card button:hover {
  background: #088f92;
}

.login-card button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.login-error {
  color: #d4620a;
  font-size: 0.8rem;
  margin-top: 12px;
}

footer {
  text-align: center;
  padding: 16px;
  font-size: 0.75rem;
  color: #adb5bd;
}