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

body {
    background-color: #f0f2f5;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-image: url(/images/anhbia.jpg);
    background-size: cover;
}

.main-container {
    width: 90%;
    max-width: 1000px;
    text-align: center;
    padding: 2%;
    border-radius: 10px;
    background-color: #ffffffc7;
}

.hero h1 {
    color: #1a73e8;
    margin-bottom: 10px;
    font-size: 2.5rem;
}

.hero p {
    color: #666;
    margin-bottom: 40px;
    font-size: 1.1rem;
}

/* Lưới hiển thị các thẻ */
.project-grid {
    display: flex;
    justify-content: center;
    gap: 30px;
    flex-wrap: wrap;
    /* Tự xuống dòng trên điện thoại */
}

/* Thiết kế thẻ Card */
.card {
    background: white;
    width: 300px;
    padding: 30px;
    border-radius: 20px;
    text-decoration: none;
    /* Bỏ gạch chân của thẻ a */
    color: #333;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 2px solid transparent;
}

.card:hover {
    transform: translateY(-10px);
    /* Bay lên nhẹ khi di chuột */

}

/* Màu sắc riêng cho từng thẻ */
.card-sales:hover {
    border-color: #ff9f43;
    box-shadow: 0 15px 30px rgba(255, 217, 0, 0.35);
}

.card-grades:hover {
    border-color: #1a73e8;
    box-shadow: 0 15px 30px rgba(0, 140, 255, 0.35);
}

.card-new-year-2026 {
    border-color: #720000;
    box-shadow: 0 15px 30px rgba(255, 0, 0, 0.35);
}

.icon-box {
    font-size: 3rem;
    margin-bottom: 20px;
}

.card-sales .icon-box {
    color: #ff9f43;
}

.card-grades .icon-box {
    color: #1a73e8;
}

.card h3 {
    margin-bottom: 10px;
    font-size: 1.5rem;
}

.card p {
    color: #777;
    margin-bottom: 20px;
    font-size: 0.9rem;
    line-height: 1.5;
}

.btn-go {
    display: inline-block;
    padding: 8px 20px;
    background-color: #eee;
    border-radius: 20px;
    font-weight: bold;
    font-size: 0.9rem;
    transition: 0.3s;
}

.card:hover .btn-go {
    background-color: #333;
    color: white;
}