* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, Helvetica, sans-serif;
    background: #f5f7fa;
    color: #333;
    line-height: 1.7;
}

header {
    background: linear-gradient(135deg, #003b71, #0057b8);
    color: white;
    padding: 80px 20px;
    text-align: center;
}

header img {
    max-width: 100%;
    height: auto;
}

header h1 {
    font-size: 3rem;
}

header .extra {
    font-size: 2rem;
    margin-bottom: 15px;
}

header p {
    font-size: 1.2rem;
    margin-bottom: 10px;
}

.btn {
    display: inline-block;
    margin-top: 25px;
    padding: 14px 28px;
    background: #fff;
    color: #003b71;
    text-decoration: none;
    border-radius: 6px;
    font-weight: bold;
}

.container {
    max-width: 1100px;
    margin: auto;
    padding: 60px 20px;
}

section {
    margin-bottom: 60px;
}

h2 {
    color: #003b71;
    margin-bottom: 20px;
    border-bottom: 3px solid #0057b8;
    display: inline-block;
    padding-bottom: 5px;
}

.card {
    background: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, .08);
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.topic {
    background: white;
    padding: 20px;
    border-left: 5px solid #0057b8;
    border-radius: 8px;
    box-shadow: 0 3px 8px rgba(0, 0, 0, .05);
}

ul {
    margin-left: 20px;
    margin-top: 15px;
}

footer {
    background: #003b71;
    color: white;
    text-align: center;
    padding: 30px;
}

.notice {
    background: #eef6ff;
    border-left: 5px solid #0057b8;
    padding: 20px;
    border-radius: 6px;
}