:root {
    --primary: #2563eb;
    --primary-dark: #1e3a8a;
    --background: #f5f7fb;
    --text: #1f2937;
    --muted: #64748b;
    --border: #dbe3ef;
    --white: #ffffff;
    --notice: #eff6ff;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    color: var(--text);
    background: var(--background);
    line-height: 1.7;
}

.header {
    padding: 48px 20px;
    color: var(--white);
    text-align: center;
    background: linear-gradient(
        135deg,
        var(--primary-dark),
        var(--primary)
    );
}

.header h1 {
    margin: 0 0 10px;
    font-size: clamp(2rem, 5vw, 3rem);
}

.header p {
    margin: 0;
    opacity: 0.9;
}

.container {
    width: min(960px, calc(100% - 32px));
    margin: 32px auto;
    padding: 42px;
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: 18px;
    box-shadow: 0 12px 30px rgba(15, 23, 42, 0.08);
}

h2 {
    margin-top: 36px;
    color: var(--primary-dark);
    font-size: 1.35rem;
}

h2:first-child {
    margin-top: 0;
}

ul {
    padding-left: 24px;
}

li {
    margin-bottom: 8px;
}

a {
    color: var(--primary);
}

.notice {
    margin: 24px 0;
    padding: 18px;
    background: var(--notice);
    border-left: 5px solid var(--primary);
    border-radius: 8px;
}

.contact {
    padding: 22px;
    background: #f8fafc;
    border: 1px solid var(--border);
    border-radius: 12px;
}

.back-link {
    display: inline-block;
    margin-top: 28px;
    padding: 11px 18px;
    color: var(--white);
    text-decoration: none;
    background: var(--primary);
    border-radius: 8px;
}

.back-link:hover {
    background: var(--primary-dark);
}

.footer {
    padding: 24px;
    text-align: center;
    color: var(--muted);
    font-size: 0.9rem;
}

@media (max-width: 640px) {
    .container {
        padding: 24px 20px;
        margin: 18px auto;
    }

    .header {
        padding: 36px 18px;
    }
}