body {
    font-family: Arial, Helvetica, sans-serif;
    margin: 0;
    background-color: #f5f7fb;
    color: #222;
    line-height: 1.6;
}
#wrapper {
    width: 980px;
    margin: 0 auto;
    background: #ffffff;
    box-shadow: 0 0 10px rgba(0,0,0,0.12);
}
header {
    background: linear-gradient(90deg, #205493, #3e78b2);
    color: white;
    padding: 25px 30px;
    text-align: center;
}
nav {
    background-color: #e7eef7;
    text-align: center;
    padding: 14px;
    border-bottom: 2px solid #c8d8ea;
}
nav a {
    color: #15406b;
    text-decoration: none;
    font-weight: bold;
    margin: 0 12px;
}
nav a:hover { text-decoration: underline; }
main { padding: 25px 35px 35px 35px; }
h1, h2, h3 { color: #1d4f7a; }
.hero {
    width: 100%;
    border: 4px solid #d8e4f1;
    margin: 15px 0;
}
.intro {
    text-align: left;
    text-indent: 25px;
    font-size: 18px;
}
.center { text-align: center; }
.right { text-align: right; }
.note {
    background-color: #eef7ea;
    border-left: 6px solid #5a9c54;
    padding: 12px 16px;
    margin: 18px 0;
}
.image-right {
    float: right;
    width: 260px;
    margin: 0 0 15px 20px;
    border: 3px solid #d7d7d7;
    padding: 6px;
    background: #fff;
}
.image-left {
    float: left;
    width: 250px;
    margin: 0 20px 15px 0;
    border: 3px solid #d7d7d7;
    padding: 6px;
    background: #fff;
}
.thumb {
    border: 3px solid #b6cadf;
    margin-top: 10px;
}
.clearfix::after {
    content: "";
    display: block;
    clear: both;
}
table {
    width: 100%;
    border-collapse: collapse;
    margin: 18px 0 24px 0;
}
caption {
    caption-side: top;
    font-weight: bold;
    color: #1d4f7a;
    padding: 8px;
}
th, td {
    border: 1px solid #7c9dbf;
    padding: 10px;
    vertical-align: top;
}
th {
    background-color: #dce8f5;
}
footer {
    background-color: #edf3fa;
    border-top: 2px solid #c8d8ea;
    padding: 18px 30px;
    font-size: 14px;
}
.small { font-size: 14px; }
.emphasis { color: #7f1d1d; font-style: italic; }
ul li, ol li { margin-bottom: 8px; }
.section-box {
    background: #fafcff;
    border: 1px solid #d8e4f1;
    padding: 16px;
    margin: 20px 0;
}