/* 鎖住背景捲動 */
body.age-gate-lock {
    overflow: hidden;
}

/* 全畫面遮罩 */
#age-gate-overlay {
    position: fixed;
    inset: 0;
    display: grid;
    place-items: center;
    background: rgba(0, 0, 0, 0.65);
    backdrop-filter: blur(2px);
    z-index: 9999;
    /* 高於主題的頂層元件 */
}

/* 彈窗 */
.age-gate-modal {
    width: min(92vw, 600px);
    background: var(--md-sys-color-surface, #fff);
    color: var(--md-sys-color-on-surface, #111);
    border-radius: 16px;
    padding: 24px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.35);
    line-height: 1.6;
}

/* 與 Material for MkDocs 深/淺色系統變數配合 */
@media (prefers-color-scheme: dark) {
    .age-gate-modal {
        background: var(--md-sys-color-surface, #1f1f1f);
        color: var(--md-sys-color-on-surface, #f3f3f3);
    }
}

.age-gate-modal h2 {
    margin: 0 0 8px;
    font-size: 1.4rem;
}

.age-gate-modal p {
    margin: 8px 0 0;
}

.age-gate-actions {
    display: flex;
    gap: 12px;
    margin-top: 18px;
}

.age-btn {
    flex: 1;
    padding: 10px 14px;
    border-radius: 10px;
    border: 0;
    cursor: pointer;
    font-weight: 600;
}

.age-btn.yes {
    background: #2e7d32;
    color: #fff;
}

.age-btn.no {
    background: #b71c1c;
    color: #fff;
}

.age-btn:focus {
    outline: 3px solid rgba(100, 150, 250, 0.7);
    outline-offset: 2px;
}

.age-gate-note {
    opacity: .75;
    font-size: .9rem;
    margin-top: 8px;
}