@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
  --primary-color: #007acc;
  --primary-light: #e0f2ff;
  --primary-lighter: #b3d9ff;
  --text-color: #333;
  --text-light: #555;
  --white: #ffffff;
  --gray-light: #f0f0f0;
  --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

/* Основные стили */
body {
  font-family: 'Inter', sans-serif;
  margin: 0;
  color: var(--text-color);
  position: relative;
  min-height: 100vh;
}

.background-gradient {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, var(--primary-light), var(--white));
  z-index: -1;
}

/* Header стили */
header {
  background: var(--primary-color);
  color: var(--white);
  padding: 1rem 2rem;
  position: relative;
  box-shadow: var(--shadow);
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.header-left h1 {
  margin: 0;
  font-weight: 600;
  font-size: 1.5rem;
  line-height: 1.2;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.student-count {
  font-size: 0.9rem;
  opacity: 0.9;
  white-space: nowrap;
}

.back-button {
  margin: 0;
}

.back-link {
  display: inline-block;
  background: var(--white);
  color: var(--primary-color);
  text-decoration: none;
  padding: 0.5rem 1rem;
  border-radius: 8px;
  font-weight: 500;
  transition: all 0.2s ease;
  border: 2px solid transparent;
  white-space: nowrap;
}

.back-link:hover {
  background: var(--primary-light);
  color: var(--text-color);
  border-color: var(--white);
  transform: translateY(-2px);
}

.header-wave {
  position: absolute;
  bottom: -10px;
  left: 0;
  width: 100%;
  height: 10px;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1200 120' preserveAspectRatio='none'%3E%3Cpath d='M0,0V46.29c47.79,22.2,103.59,32.17,158,28,70.36-5.37,136.33-33.31,206.8-37.5C438.64,32.43,512.34,53.67,583,72.05c69.27,18,138.3,24.88,209.4,13.08,36.15-6,69.85-17.84,104.45-29.34C989.49,25,1113-14.29,1200,52.47V0Z' opacity='.25' fill='%23007acc'%3E%3C/path%3E%3Cpath d='M0,0V15.81C13,36.92,27.64,56.86,47.69,72.05,99.41,111.27,165,111,224.58,91.58c31.15-10.15,60.09-26.07,89.67-39.8,40.92-19,84.73-46,130.83-49.67,36.26-2.85,70.9,9.42,98.6,31.56,31.77,25.39,62.32,62,103.63,73,40.44,10.79,81.35-6.69,119.13-24.28s75.16-39,116.92-43.05c59.73-5.85,113.28,22.88,168.9,38.84,30.2,8.66,59,6.17,87.09-7.5,22.43-10.89,48-26.93,60.65-49.24V0Z' opacity='.5' fill='%23007acc'%3E%3C/path%3E%3Cpath d='M0,0V5.63C149.93,59,314.09,71.32,475.83,42.57c43-7.64,84.23-20.12,127.61-26.46,59-8.63,112.48,12.24,165.56,35.4C827.93,77.22,886,95.24,951.2,90c86.53-7,172.46-45.71,248.8-84.81V0Z' fill='%23007acc'%3E%3C/path%3E%3C/svg%3E");
  background-size: cover;
}

/* Стили для таблицы */
main {
  padding: 2rem;
}

.students-container {
  max-width: 800px;
  margin: 0 auto;
  background: var(--white);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow);
}

.students-table {
  overflow-x: auto;
}

.students-table table {
  width: 100%;
  border-collapse: collapse;
  min-width: 400px;
}

.students-table th {
  background: var(--primary-color);
  color: var(--white);
  padding: 1rem;
  text-align: left;
  font-weight: 500;
  font-size: 1rem;
}

.students-table td {
  padding: 1rem;
  border-bottom: 1px solid #eee;
  font-size: 0.95rem;
}

.students-table tr:last-child td {
  border-bottom: none;
}

.students-table tbody tr:hover {
  background: var(--primary-light);
}

.student-number {
  width: 60px;
  text-align: center;
  font-weight: 600;
  color: var(--primary-color);
}

.student-name {
  padding-left: 1rem;
}

.empty-state {
  text-align: center;
  color: var(--text-light);
  padding: 2rem;
  font-style: italic;
}

.error-message {
  background: #ffebee;
  color: #c62828;
  padding: 1rem;
  border-radius: 8px;
  margin: 1rem auto;
  max-width: 800px;
  text-align: center;
}

/* Адаптация для мобильных устройств */
@media (max-width: 768px) {
  header {
    padding: 0.8rem 1rem;
  }
  
  .header-container {
    flex-direction: column;
    align-items: stretch;
    gap: 0.5rem;
  }
  
  .header-left h1 {
    font-size: 1.3rem;
    text-align: center;
  }
  
  .header-right {
    justify-content: space-between;
    gap: 1rem;
  }
  
  .student-count {
    font-size: 0.8rem;
  }
  
  .back-link {
    padding: 0.4rem 0.8rem;
    font-size: 0.9rem;
  }
  
  main {
    padding: 1rem;
  }
  
  .students-table th,
  .students-table td {
    padding: 0.8rem;
    font-size: 0.9rem;
  }
  
  .student-number {
    width: 50px;
  }
}

@media (max-width: 480px) {
  .header-container {
    align-items: center;
  }
  
  .header-right {
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
  }
  
  .students-table th,
  .students-table td {
    padding: 0.6rem;
    font-size: 0.85rem;
  }
  
  .student-number {
    width: 40px;
  }
  
  .back-link {
    padding: 0.3rem 0.6rem;
    font-size: 0.85rem;
  }
}

/* Для очень маленьких экранов */
@media (max-width: 360px) {
  .header-left h1 {
    font-size: 1.1rem;
  }
  
  .students-table th,
  .students-table td {
    padding: 0.5rem;
    font-size: 0.8rem;
  }
}