/* Стили для кнопок */
.btn {
  display: inline-block;
  font-weight: 600;
  text-align: center;
  vertical-align: middle;
  user-select: none;
  border: none;
  padding: 0.5rem 1.2rem;
  font-size: 1rem;
  line-height: 1.5;
  border-radius: 10px;
  transition: all 0.3s ease-in-out;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.08);
  text-decoration: none;
}

/* Большая блок-кнопка */
.btn-lg.btn-block {
  height: 120px;
  min-width: 250px;
  white-space: normal;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 15px 25px;
  font-size: 1.2rem;
  font-weight: 600;
  border-radius: 12px;
  border: none;
  cursor: pointer;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
  box-shadow: 0 6px 12px rgba(0, 0, 0, 0.1);
  background-color: #339af0;
  color: white;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
  letter-spacing: 0.5px;
  line-height: 1.4;
}

.btn-lg.btn-block:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
  background-color: #1c7ed6;
}

.btn-lg.btn-block:active {
  transform: translateY(1px);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.btn-lg.btn-block::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(255, 255, 255, 0.1);
  opacity: 0;
  transition: all 0.5s;
  border-radius: 12px;
}

.btn-lg.btn-block:hover::after {
  opacity: 1;
  transform: scale(1.2);
}

.btn-lg.btn-block i {
  margin-right: 10px;
  font-size: 1.5rem;
  vertical-align: middle;
}

/* Унифицированные стили кнопок */
.btn-default,
.btn-success,
.btn-secondary,
a.btn:not(.btn-danger):not(.btn-primary):not(.btn-sm) {
  background-color: #339af0;
  color: white;
}

.btn-default:hover,
.btn-success:hover,
.btn-secondary:hover,
a.btn:not(.btn-danger):not(.btn-primary):not(.btn-sm):hover {
  background-color: #339af0;
  transform: translateY(-2px);
  box-shadow: 0 6px 15px rgba(0, 0, 0, 0.12);
  color: white;
}

/* Кнопки "Редактировать" */
.btn-primary {
  background-color: #339af0;
  color: white;
}
.btn-primary:hover {
  background-color: #339af0;
  transform: translateY(-2px);
}

/* Кнопки "Удалить" */
.btn-danger {
  background-color: #fa5252;
  color: white;
}
.btn-danger:hover {
  background-color: #c92a2a;
  transform: translateY(-2px);
}

/* Маленькие кнопки */
.btn-sm {
  font-size: 0.85rem;
  padding: 0.3rem 0.8rem;
  border-radius: 8px;
}

/* Навигационные кнопки */
.nav-btn {
  background-color: #339af0;
  color: white;
  border: none;
  border-radius: 50px;
  padding: 10px 25px;
  font-weight: 600;
  display: flex;
  align-items: center;
  transition: all 0.3s ease;
  box-shadow: 0 4px 10px rgba(37, 117, 252, 0.3);
}

.nav-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 15px rgba(37, 117, 252, 0.4);
  color: white;
  text-decoration: none;
}

.nav-btn i {
  margin: 0 5px;
  font-size: 1.2em;
}

.student-payment-btn {
  position: relative;
}

.payment-badge {
  font-size: 0.6em;
  padding: 0.25em 0.5em;
}