/**
 * 限定公開ビューア向け 404（パスコード欠如・無効時）
 */
.viewer-not-found-overlay {
    box-sizing: border-box;
    position: fixed;
    inset: 0;
    z-index: 2147483000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    margin: 0;
    background: #f4f6f8;
    font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Hiragino Sans', 'Noto Sans JP', sans-serif;
    color: #1a1a1a;
}

.viewer-not-found-overlay[hidden] {
    display: none !important;
}

.viewer-not-found-card {
    max-width: 420px;
    width: 100%;
    padding: 40px 36px;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 8px 32px rgba(15, 23, 42, 0.08);
    text-align: center;
}

.viewer-not-found-code {
    margin: 0 0 8px;
    font-size: 3rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    color: #94a3b8;
    line-height: 1;
}

.viewer-not-found-card h1 {
    margin: 0 0 16px;
    font-size: 1.25rem;
    font-weight: 600;
    color: #0f172a;
}

.viewer-not-found-desc {
    margin: 0;
    font-size: 0.9375rem;
    line-height: 1.65;
    color: #475569;
}