```css
* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    color: #333;
    background: white;
}

/* HEADER */

header {
    background: #f7f7f7;
    border-bottom: 1px solid #ddd;
}

header nav {
    max-width: 1100px;
    margin: auto;
    padding: 20px 25px;

    display: flex;
    gap: 30px;
}

header nav a {
    color: #555;
    text-decoration: none;
    font-size: 14px;
}

header nav a:hover {
    color: #337ab7;
}

/* MAIN */

main {
    max-width: 1100px;
    margin: auto;
    padding: 35px 25px;
}

.breadcrumbs {
    color: #888;
    font-size: 13px;
    margin-bottom: 30px;
}

.breadcrumbs a {
    color: #337ab7;
    text-decoration: none;
}

.breadcrumbs span {
    margin: 0 8px;
}

/* HEADINGS */

h1 {
    font-size: 32px;
    font-weight: normal;
    color: #333;

    border-bottom: 1px solid #ddd;
    padding-bottom: 15px;
}

h2 {
    margin-top: 40px;

    font-size: 23px;
    font-weight: normal;
}

p {
    max-width: 750px;
    font-size: 15px;
    line-height: 1.7;
}

a {
    color: #337ab7;
    user-select: none;
}

/* LIST */

li {
    margin: 10px 0;
}

/* NOTICE */

.notice {
    max-width: 750px;

    margin-top: 30px;
    padding: 18px 20px;

    background: #f5f5f5;
    border-left: 4px solid #337ab7;

    font-size: 14px;
    line-height: 1.6;
}

/* FOOTER */

footer {
    margin-top: 60px;
    padding: 35px 25px;

    background: #333;
    color: #ddd;
}

footer p {
    max-width: 900px;
    margin: auto;
    color: #bbb;
}

.footer-links {
    max-width: 900px;
    margin: 20px auto 0;

    display: flex;
    gap: 25px;
}

.footer-links button {
    color: #ccc;
    background: #333;
    border: none;
}

.footer-links a:hover {
    color: white;
}

/* MOBILE */

@media (max-width: 700px) {
    main {
        padding: 25px 20px;
    }

    header nav {
        flex-wrap: wrap;
        padding: 15px 20px;
    }

    h1 {
        font-size: 27px;
    }
}
```