:root {
  --bg-color: #f4f7f9;
  --text-primary: #1a202c;
  --text-secondary: #4a5568;
  --card-bg: #ffffff;
  --card-border: #e2e8f0;
  --brand-color: #4299e1;
  --brand-color-light: #ebf8ff;
  --gray-color: #a0aec0;
  --gray-color-light: #f7fafc;
}

body {
  font-family: 'Inter', sans-serif;
  background-color: var(--bg-color);
  color: var(--text-primary);
  margin: 0;
  line-height: 1.6;
}

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

.header {
  padding: 48px 0;
  text-align: center;
  margin-bottom: 32px;
}

h1 {
  font-size: 36px;
  font-weight: 700;
  margin: 0 0 16px;
}

.subtitle {
  font-size: 18px;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

.grade-section {
  margin-bottom: 48px;
}

.grade-section h2 {
  font-size: 28px;
  font-weight: 600;
  margin-bottom: 24px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--card-border);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
}

.project-card {
  background-color: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  padding: 24px;
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.project-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 16px;
}

.card-header h3 {
  font-size: 18px;
  font-weight: 600;
  margin: 0;
  margin-right: 16px;
}

.time-badge {
  background-color: var(--brand-color-light);
  color: var(--brand-color);
  font-size: 12px;
  font-weight: 500;
  padding: 4px 8px;
  border-radius: 9999px;
  flex-shrink: 0;
}

.card-body p {
  font-size: 14px;
  margin: 0 0 8px;
  color: var(--text-secondary);
}

.card-body p:last-child {
  margin-bottom: 0;
}

.card-body strong {
  color: var(--text-primary);
  font-weight: 500;
}

/* Card Statuses */
.project-card.is-unavailable {
  background-color: var(--gray-color-light);
  cursor: not-allowed;
  opacity: 0.7;
}

.project-card.is-unavailable:hover {
  transform: none;
  box-shadow: none;
}

.soon-badge {
  background-color: var(--gray-color);
  color: white;
  font-size: 12px;
  font-weight: 500;
  padding: 4px 8px;
  border-radius: 9999px;
  flex-shrink: 0;
  margin-left: 8px;
}