:root {
  --primary: #3498db;
  --secondary: #2c3e50;
  --light: #ecf0f1;
  --accent: #e74c3c;
  --text: #333;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
}

body {
  background-color: var(--light);
  color: var(--text);
  line-height: 1.6;
}

header {
  background-color: var(--secondary);
  color: white;
  padding: 2rem;
  text-align: center;
}

.main-title {
  font-size: 2.3rem;
  margin-bottom: 0.5rem;
}

.personal-info {
  background-color: var(--primary);
  color: white;
  padding: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-start;
  gap: 3rem;
  padding-left: 4rem;
}

.info-item {
  flex: 1;
  min-width: 200px;
  max-width: 300px;
}

.info-item h3 {
  border-bottom: 2px solid white;
  padding-bottom: 0.5rem;
  margin-bottom: 0.5rem;
}

.thesis-info {
  padding: 2rem;
  background-color: white;
  margin: 1rem;
  border-radius: 5px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.thesis-info h2 {
  color: var(--secondary);
  margin-bottom: 1rem;
  border-bottom: 2px solid var(--primary);
  padding-bottom: 0.5rem;
}

.diary-section {
  padding: 2rem;
  margin: 1rem;
}

.diary-section h2 {
  color: var(--secondary);
  margin-bottom: 1rem;
  border-bottom: 2px solid var(--primary);
  padding-bottom: 0.5rem;
}

.week-entries {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.week-card {
  background-color: white;
  border-radius: 5px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  overflow: hidden;
}

.week-header {
  background-color: var(--primary);
  color: white;
  padding: 0.5rem 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
}

.week-content {
  padding: 1rem;
  display: none;
}

.week-content.active {
  display: block;
}

footer {
  background-color: var(--secondary);
  color: white;
  text-align: center;
  padding: 1rem;
  margin-top: 2rem;
}

@media (max-width: 768px) {
  .personal-info {
    flex-direction: column;
  }

  .info-item {
    max-width: 100%;
  }
}

.white-text {
  color: white;
}