@charset "UTF-8";

:root {
    color: #17212b;
    font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic UI", "Yu Gothic", Meiryo, sans-serif;
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
}

body {
    margin: 0;
    background: #f7fafc;
}

.rules-page {
    width: min(900px, calc(100% - 32px));
    margin: 0 auto;
    padding: 40px 0 88px;
}

.rules-back {
    display: flex;
    align-items: center;
    justify-content: center;
    width: fit-content;
    min-height: 44px;
    padding: 0 18px;
    border-radius: 999px;
    background: #edf4f8;
    box-shadow: inset 0 0 0 1px #d8e4eb;
    color: #17212b;
    font-size: 0.9rem;
    font-weight: 700;
    text-decoration: none;
    transition: opacity 0.2s, transform 0.2s;
}

.rules-back:hover {
    opacity: 0.75;
    transform: translateY(-2px);
}

.rules-heading {
    padding: 56px 0 44px;
    text-align: center;
}

.rules-heading h1 {
    margin: 0;
    font-size: clamp(1.8rem, 4vw, 2.6rem);
    line-height: 1.45;
}

.rules-heading p {
    margin: 14px 0 0;
    color: #66727e;
    font-size: 0.95rem;
}

.rules-document {
    padding: 16px 48px;
    border-radius: 16px;
    background: #fff;
    box-shadow: 0 6px 24px rgba(23, 33, 43, 0.08);
}

.rule-article {
    padding: 32px 0;
    border-bottom: 1px solid #e3e7ec;
}

.rule-article:last-child {
    border-bottom: 0;
}

.rule-article h2 {
    margin: 0 0 16px;
    font-size: 1.15rem;
}

.rule-article p,
.rule-article li {
    margin: 0;
    font-size: 1rem;
    line-height: 2;
}

.rule-article p + p {
    margin-top: 14px;
}

.rule-article ul {
    margin: 12px 0;
    padding-left: 1.5em;
}

.rules-back-bottom {
    min-width: 220px;
    margin: 48px auto 0;
    background: linear-gradient(90deg, #4ba4e5, #7cbef0);
    box-shadow: 0 3px 8px rgba(0, 0, 0, 0.18);
    color: #fff;
}

@media (max-width: 600px) {
    .rules-page {
        padding-top: 24px;
    }

    .rules-heading {
        padding: 40px 0 28px;
    }

    .rules-document {
        padding: 8px 22px;
        border-radius: 10px;
    }

    .rule-article {
        padding: 26px 0;
    }
}