/* ===== Memo page ===== */
        .memo {
            background: #000000;
            padding: calc(59px + var(--spacing-lg)) 0 var(--spacing-xl);
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
            color: #ffffff;
        }
        .memo .memo-wrap {
            max-width: 1600px;
            padding: 0 clamp(16px, 3.5vw, 48px);
        }
        .memo-layout {
            display: grid;
            grid-template-columns: minmax(0, 1fr) 280px;
            gap: 4rem;
            align-items: start;
        }
        .memo-column {
            max-width: 840px;
            margin: 0;
        }
        .memo-back {
            position: fixed;
            top: calc(59px + 1.5rem);
            left: clamp(1.5rem, 2vw, 2rem);
            z-index: 2001;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            background: rgba(255, 255, 255, 0.05);
            color: #ffffff;
            border: none;
            border-radius: 50%;
            text-decoration: none;
            transition: all var(--transition-base);
        }
        .memo-back:hover {
            background: rgba(255, 255, 255, 0.15);
        }
        .memo-back svg {
            width: 20px;
            height: 20px;
        }
        /* keep the content clear of the fixed back button in the left gutter */
        .memo .memo-wrap {
            padding-left: calc(clamp(1.5rem, 2vw, 2rem) + 40px + 1.5rem);
        }
        @media (max-width: 768px) {
            .memo-back {
                display: none;
            }
            .memo .memo-wrap {
                padding-left: clamp(16px, 3.5vw, 48px);
            }
        }
        .memo-toc {
            position: sticky;
            top: 90px;
            max-height: calc(100vh - 110px);
            overflow-y: auto;
            padding-right: 0.5rem;
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
            scrollbar-width: thin;
            scrollbar-color: rgba(255, 255, 255, 0.2) transparent;
        }
        .memo-toc::-webkit-scrollbar { width: 4px; }
        .memo-toc::-webkit-scrollbar-thumb { background: rgba(255, 255, 255, 0.2); border-radius: 2px; }
        .memo-toc-title {
            margin-bottom: 0.75rem;
            color: #ffffff;
            font-size: 0.8rem;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 0.05em;
        }
        .memo-toc-nav {
            display: flex;
            flex-direction: column;
            border-left: 1px solid rgba(255, 255, 255, 0.12);
        }
        .memo-toc-link {
            display: block;
            margin-left: -1px;
            padding: 0.4rem 0.9rem;
            border-left: 1px solid transparent;
            color: rgba(255, 255, 255, 0.6);
            font-size: 0.85rem;
            line-height: 1.35;
            text-decoration: none;
            transition: color 0.2s ease, border-color 0.2s ease;
        }
        .memo-toc-link:hover {
            color: #ffffff;
        }
        .memo-toc-link.active {
            color: #ffffff;
            font-weight: 600;
            border-left-color: #ffffff;
        }
        .memo-section {
            scroll-margin-top: 79px;
        }
        @media (max-width: 1000px) {
            .memo-layout {
                grid-template-columns: minmax(0, 1fr);
                gap: 2rem;
            }
            .memo-toc {
                position: static;
                order: -1;
                max-height: 14rem;
            }
        }
        .memo-title {
            line-height: 1.1;
            color: #d4d4d4;
            font-family: 'BebasNeue', sans-serif;
            font-size: clamp(2rem, 5vw, 3.5rem);
            font-weight: 700;
            margin: 0 0 0.5rem;
        }
        .memo-description {
            max-width: none;
            margin: 0;
            color: #c8c8c8;
            font-size: clamp(0.95rem, 2vw, 1.1rem);
            line-height: 1.7;
        }
        .memo-section {
            margin-top: var(--spacing-xl);
            padding-top: var(--spacing-lg);
            border-top: 1px solid rgba(255, 255, 255, 0.1);
        }
        .memo-section + .memo-section {
            border-top: none;
            margin-top: 1rem;
            padding-top: 0;
        }
        .memo-banner {
            display: block;
            width: 100%;
            height: auto;
            margin: 0 0 var(--spacing-md);
        }
        .memo-figure {
            display: block;
            width: 100%;
            height: auto;
            margin: 0 0 var(--spacing-md);
            border-radius: 12px;
        }
        .memo-figure-narrow {
            max-width: 520px;
            margin-left: auto;
            margin-right: auto;
        }
        .memo-video {
            display: block;
            width: 100%;
            height: auto;
            aspect-ratio: 16 / 9;
            margin: 0 0 var(--spacing-md);
            border-radius: 12px;
            background: #000000;
            object-fit: cover;
            pointer-events: none;
        }
        .memo-subhead {
            margin: 2rem 0 0.75rem;
            color: #ffffff;
            font-size: 1rem;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 0.05em;
        }
        .memo-text {
            width: 100%;
        }
        .memo-text p {
            margin: 0 0 var(--spacing-md);
            font-size: 0.95rem;
            line-height: 1.7;
            color: rgba(255, 255, 255, 0.85);
        }
        .memo-text p:last-child {
            margin-bottom: 0;
        }