body {
  font-family: "Segoe UI", sans-serif;
  background-color: #0f2b1e;
  color: #e6f0eb;
  margin: 0;
  padding: 0;
}

/* Верхня панель */
header {
  background-color: #164a2e;
  border-bottom: 3px solid #1e6b40;
  padding: 25px 60px;
}

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

/* Центрування тексту заголовка */
.title-block {
  text-align: center;
  flex: 1; /* дозволяє центру вирівнятись між фото */
  margin-left: 150px;
}

.title-block h1 {
  margin: 0;
  font-size: 28px;
  color: #baf2c7;
}

.title-block p {
  margin: 6px 0;
  font-size: 15px;
  color: #e6f0eb;
}

.photo {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  overflow: hidden;
  border: 3px solid #2d8f5c;
  background-color: #133e27;
  display: flex;
  justify-content: center;
  align-items: center;
}

.photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Кнопки лабораторних */
.lab-buttons {
  display: flex;
  justify-content: flex-end;
  flex-wrap: wrap;
  background-color: #1a3c2b;
  padding: 15px 60px;
  gap: 12px;
}

.lab-btn {
  background-color: #256b46;
  border: none;
  color: #e6f0eb;
  padding: 12px 20px;
  border-radius: 20px;
  cursor: pointer;
  font-weight: 600;
  transition: all 0.25s ease;
}

.lab-btn:hover {
  background-color: #2d8f5c;
  transform: scale(1.05);
}

.lab-btn:active {
  background-color: #1c5233;
  transform: scale(0.97);
}

/* Активна кнопка */
.lab-btn.active {
  background-color: #33a365;
  color: #ffffff;
}

/* Основний макет */
main {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 30px 60px;
}

/* Бокове меню */
.sidebar {
  width: 230px;
  background-color: #153524;
  padding: 15px;
  border-radius: 20px;
  margin-right: 25px;
}

.sidebar button {
  width: 100%;
  background-color: #256b46;
  border: none;
  color: #e6f0eb;
  padding: 12px;
  border-radius: 15px;
  margin: 6px 0;
  cursor: pointer;
  transition: 0.25s;
}

.sidebar button:hover {
  background-color: #2d8f5c;
}

.sidebar button:active {
  background-color: #1c5233;
}

/* Контентна область */
.content {
  flex: 1;
  background-color: #1b3a28;
  border-radius: 20px;
  padding: 25px;
  min-height: 420px;
  box-shadow: 0 0 12px rgba(0, 0, 0, 0.4);
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(5px); }
  to { opacity: 1; transform: translateY(0); }
}