* {
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: lightgray;
    padding: 40px;
}

.main-title {
    text-align: center;
    color: #2c3e50;
    margin-bottom: 40px;
    text-transform: uppercase;
    letter-spacing: 2px;
}

/* Chia lưới: 3 cột trên máy tính, 2 cột trên tablet, 1 cột trên điện thoại */
.grid-layout {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
    max-width: 1000px;
    margin: 0 auto;
}

/* Định dạng từng thẻ tuần */
.week-card {
    background: #fff;
    padding: 30px;
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.week-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 15px rgba(0,0,0,0.2);
}

.week-card h3 {
    margin-bottom: 20px;
    color: #34495e;
    font-size: 1.5rem;
}

/* Nút bấm xem bài */
.btn-view {
    display: inline-block;
    padding: 10px 20px;
    background-color: #3498db;
    color: white;
    text-decoration: none;
    border-radius: 25px;
    font-weight: bold;
    transition: background 0.3s;
}

.btn-view:hover {
    background-color: #2980b9;
}
.student-profile {
    background-color: #ffffff;
    max-width: 600px;
    margin: 0 auto 40px auto;
    padding: 20px 25px;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    display: flex;
    align-items: center;
    gap: 20px;
    border-left: 6px solid #3498db;
}

.profile-avatar {
    font-size: 40px;
    background-color: #f0f4f8;
    width: 70px;
    height: 70px;
    min-width: 70px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
}

.profile-info {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.student-name {
    font-size: 20px;
    font-weight: bold;
    color: #2c3e50;
    margin: 0;
    text-transform: uppercase;
}

.student-id, .student-uni {
    margin: 0;
    font-size: 15px;
    color: #555;
}

.grid-layout {
    max-width: 900px;
    margin: 0 auto;
}