* { box-sizing: border-box; margin: 0; padding: 0; }
    body { font-family: 'Segoe UI', sans-serif; background: #f0f4f8; min-height: 100vh; }

    .container { max-width: 1100px; margin: 32px auto; padding: 0 16px; }
    .section-header { margin-bottom: 24px; }
    .section-title { font-size: 22px; font-weight: 700; color: #1a202c; }
    .section-subtitle { font-size: 13px; color: #718096; margin-top: 4px; }

    .student-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
      gap: 16px;
    }

    .student-card {
      background: #fff;
      border-radius: 12px;
      padding: 20px;
      box-shadow: 0 1px 4px rgba(0,0,0,0.06);
      border: 1px solid #e2e8f0;
      cursor: pointer;
      transition: box-shadow 0.2s, transform 0.15s;
    }
    .student-card:hover {
      box-shadow: 0 6px 16px rgba(0,0,0,0.1);
      transform: translateY(-2px);
      border-color: #cbd5e0;
    }
    .student-name {
      font-size: 16px; font-weight: 700; color: #1a202c; margin-bottom: 4px;
    }
    .student-info {
      font-size: 13px; color: #718096; margin-bottom: 12px; line-height: 1.6;
    }
    .student-stats {
      display: flex; gap: 12px;
      padding-top: 12px;
      border-top: 1px solid #f0f4f8;
    }
    .student-stat { flex: 1; }
    .stat-label { font-size: 11px; color: #a0aec0; }
    .stat-value { font-size: 16px; font-weight: 600; color: #2d3748; }

    .empty-state {
      grid-column: 1 / -1;
      text-align: center;
      padding: 60px 0;
      color: #a0aec0;
      font-size: 14px;
    }


    @media (max-width: 768px) {
      body { overflow-x: hidden; }
      .container { margin: 20px auto; padding: 0 14px; }
      .student-grid { grid-template-columns: 1fr; }
      .student-card { padding: 18px; }
      .section-header { margin-bottom: 18px; }
    }