/* =========================================================
   rule.css
   ---------------------------------------------------------
   このファイルの責務:
   - rule.php のルールページ専用スタイル
   - 共通 page-heading / section-accent-title と組み合わせる
   - 章カード + 内側 article/subsection の多階層ルール表示
   ========================================================= */

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background: var(--color-page-bg);
    color: var(--color-text-main);
    font-family: sans-serif;
}

.rule-page {
    width: 100%;
    padding: 24px 16px 40px;
}

.rule-page__inner {
    max-width: var(--page-content-max-width);
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.rule-toc {
    border: 1px solid var(--color-border-card);
    border-radius: var(--radius-base);
    background: var(--color-surface);
    padding: 14px 16px;
}

.rule-toc__title {
    margin: 0 0 10px;
    font-size: 16px;
    font-weight: 700;
    line-height: 1.4;
    color: var(--color-text-strong);
}

.rule-toc__list {
    margin: 0;
    padding: 0;
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 8px 12px;
}

.rule-toc__link {
    color: var(--color-text-main);
    line-height: 1.5;
    text-decoration: underline;
    text-underline-offset: 3px;
}

.rule-toc__link:hover {
    color: var(--color-text-strong);
}

.rule-section {
    scroll-margin-top: 80px;
    border: 1px solid var(--color-border-card);
    border-radius: var(--radius-base);
    background: var(--color-surface);
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.rule-section__title {
    width: 100%;
    padding-left: 0;
    border-left: none;
    margin: 0;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--color-border-card);
    font-size: 20px;
    font-weight: 700;
    line-height: 1.4;
    color: var(--color-text-strong);
}

.rule-article {
    display: flex;
    flex-direction: column;
    gap: 12px;
    padding-top: 14px;
    border-top: 1px solid var(--color-border-card);
}

.rule-section__title + .rule-article {
    padding-top: 0;
    border-top: none;
}

.rule-article__title {
    margin: 0;
    padding-left: 12px;
    border-left: 4px solid var(--color-section-title-accent);
    font-size: 18px;
    font-weight: 700;
    line-height: 1.45;
    color: var(--color-text-strong);
}

.rule-section__title::before {
    display: none;
}

.rule-subsection {
    margin-left: 10px;
    padding: 12px 14px 12px 16px;
    border-left: 2px solid var(--color-border-card);
    background: var(--color-surface-soft);
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.rule-subsection__title {
    margin: 0;
    padding-left: 10px;
    border-left: 3px solid var(--color-section-title-accent);
    font-size: 15px;
    font-weight: 700;
    line-height: 1.45;
    color: var(--color-text-strong);
}

.rule-detail-block {
    margin-left: 20px;
    padding-left: 0;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
}

.rule-detail-block__title {
    display: inline-block;
    margin: 0;
    padding-bottom: 5px;
    border-bottom: 1px dashed var(--color-border-card);
    font-size: 15px;
    font-weight: 700;
    line-height: 1.45;
    color: var(--color-text-strong);
}

.rule-section p,
.rule-article p,
.rule-subsection p,
.rule-detail-block p {
    margin: 0;
    line-height: 1.6;
    color: var(--color-text-main);
}

.rule-list {
    margin: 0;
    padding-left: 1.4em;
    line-height: 1.6;
}

.rule-list li + li {
    margin-top: 4px;
}

.rule-highlight {
    padding: 0 0.25em;
    background: var(--color-primary-soft);
    color: var(--color-primary-text);
    font-weight: 700;
}

.rule-note {
    padding: 10px 12px;
    border: 1px solid var(--color-primary-border-soft);
    border-radius: var(--radius-base);
    background: var(--color-primary-soft);
    color: var(--color-primary-text);
    line-height: 1.7;
}

.rule-action-list {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.rule-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 40px;
    padding: 0 14px;
    border: 1px solid var(--color-border-button);
    border-radius: var(--radius-base);
    background: var(--color-surface);
    color: var(--color-text-main);
    font-weight: 600;
    line-height: 1.4;
    text-decoration: none;
}

.rule-button:hover {
    background: var(--color-surface-soft);
    border-color: var(--color-border-button-hover);
    color: var(--color-text-strong);
}

.rule-button:focus-visible {
    outline: 2px solid var(--color-focus);
    outline-offset: 2px;
}

.rule-history {
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.rule-history__row {
    display: grid;
    grid-template-columns: 120px minmax(0, 1fr);
    gap: 12px;
    line-height: 1.7;
}

.rule-history__row dt {
    color: var(--color-text-muted);
    font-weight: 600;
}

.rule-history__row dd {
    margin: 0;
}

.rule-modal[hidden] {
    display: none !important;
}

.rule-modal {
    position: fixed;
    inset: 0;
    z-index: 9999; /* ← header / drawer より確実に上に */
}

.rule-modal__backdrop {
    position: absolute;
    inset: 0;
    z-index: 0;
    background: rgba(15, 23, 42, 0.48);
}

.rule-modal__dialog {
    position: relative;
    z-index: 1;
    width: min(920px, calc(100% - 48px));
    max-height: min(820px, calc(100vh - 48px));
    margin: 50vh auto 0;
    transform: translateY(-50%);
    border: 1px solid var(--color-border-card);
    border-radius: var(--radius-base);
    background: var(--color-surface);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.rule-modal__header {
    flex: 0 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 14px 16px;
    border-bottom: 1px solid var(--color-border-card);
    background: var(--color-title-block);
    color: var(--color-primary-text-inverse);
}

.rule-modal__title {
    margin: 0;
    font-size: 20px;
    line-height: 1.4;
}

.rule-modal__close-button {
    appearance: none;
    border: none;
    background: transparent;
    padding: 0;
    width: 32px;
    height: 32px;
    min-width: 32px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
}

.rule-modal__close-button:hover {
    background: rgba(255, 255, 255, 0.14);
}

.rule-modal__close-button:focus-visible {
    outline: 2px solid var(--color-focus);
    outline-offset: 2px;
}

.rule-modal__close-icon {
    display: block;
    width: 18px;
    height: 18px;
    filter: brightness(0) invert(1);
}

.rule-modal__body {
    flex: 1 1 auto;
    min-height: 0;
    overflow: auto;
    padding: 18px;
}

.rule-terms {
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.rule-terms__section {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--color-border-card);
}

.rule-terms__section:last-child {
    padding-bottom: 0;
    border-bottom: none;
}

.rule-terms__section h3 {
    margin: 0;
    font-size: 17px;
    line-height: 1.45;
    color: var(--color-text-strong);
}

.rule-terms__section p {
    margin: 0;
    line-height: 1.6;
    color: var(--color-text-main);
}

.rule-terms__section ul {
    margin: 0;
    padding-left: 1.4em;
    line-height: 1.6;
}

.rule-terms__section li + li {
    margin-top: 4px;
}

.rule-credit-list {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.rule-credit-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.rule-credit-group__title {
    margin: 0;
    font-size: 15px;
    line-height: 1.45;
    color: var(--color-text-strong);
}

.rule-credit-group__text {
    margin: 0;
    line-height: 1.6;
}

.rule-credit-link-list {
    margin: 0;
    padding-left: 1.2em;
    line-height: 1.6;
}

.rule-credit-link-list a {
    color: inherit;
    text-decoration: underline;
    text-underline-offset: 2px;
}

.rule-credit-link-list a:hover {
    opacity: 0.76;
}

.rule-image-spec-table-wrap {
    overflow-x: auto;
}

.rule-image-spec-table {
    width: 100%;
    border-collapse: collapse;
    border: 1px solid var(--color-border-card);
    background: var(--color-surface);
}

.rule-image-spec-table th,
.rule-image-spec-table td {
    padding: 12px 14px;
    border-bottom: 1px solid var(--color-border-card);
    vertical-align: middle;
    line-height: 1.6;
}

.rule-image-spec-table tr:last-child th,
.rule-image-spec-table tr:last-child td {
    border-bottom: none;
}

.rule-image-spec-table th {
    width: 28%;
    min-width: 140px;
    color: var(--color-text-strong);
    font-weight: 700;
    text-align: left;
    background: var(--color-surface-soft);
}

.rule-image-spec-table td {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.rule-image-spec-table td span {
    color: var(--color-text-muted);
    font-size: 13px;
}

@media (max-width: 767px) {
    .rule-page {
        padding: 16px 12px 32px;
    }

    .rule-section {
        padding: var(--responsive-section-padding);
    }

    .rule-subsection {
        padding: 10px 12px;
    }

    .rule-detail-block {
        margin-left: 12px;
    }

    .rule-history__row {
        grid-template-columns: 1fr;
        gap: 2px;
    }
}
@media (max-width: 767px) {
    .rule-page {
        font-size: var(--responsive-page-font-size);
    }

    .rule-section__title {
        font-size: calc(var(--responsive-section-title-size) + 1px);
    }

    .rule-article__title {
        font-size: var(--responsive-section-title-size);
    }

    .rule-subsection__title {
        font-size: 14px;
    }
}