:root {
            --navy: #1d1d1f; --text: #1d1d1f; --text-secondary: #424245; --text-tertiary: #6e6e73; --text-muted: #86868b;
            --bg: #ffffff; --bg-alt: #f5f5f7; --bg-soft: #fbfbfd; --bg-cream: #faf7f2;
            --border: #d2d2d7; --border-light: #e8e8ed; --border-soft: #f0f0f3;
            --apple-blue: #0071e3; --apple-blue-hover: #0077ed; --apple-blue-link: #0066cc; --apple-blue-bright: #2997ff; --apple-blue-soft: rgba(0,113,227,0.08);
            --energy: #ff6b35; --energy-soft: #fff0e8;
            --mint: #10b981; --mint-dark: #059669; --mint-soft: #ecfdf5;
            --coral: #ec4899; --coral-soft: #fdf2f8;
            --sun: #f59e0b; --sun-soft: #fffbeb;
            --sky: #0ea5e9; --sky-soft: #f0f9ff;
            --lavender: #7c3aed; --lavender-soft: #f5f3ff;
            --ink: #0a1628;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.04);
            --shadow: 0 3px 12px rgba(0,0,0,0.06), 0 1px 3px rgba(0,0,0,0.04);
            --shadow-lg: 0 12px 40px rgba(0,0,0,0.10);
            --radius: 10px; --radius-lg: 16px; --radius-xl: 22px; --radius-2xl: 28px; --radius-pill: 980px;
            --transition: 0.32s cubic-bezier(0.4,0.0,0.2,1);
            --max-w: 1280px; --max-w-read: 720px;
            --font-display: 'Be Vietnam Pro','Inter',-apple-system,BlinkMacSystemFont,system-ui,sans-serif;
            --font-body: 'Inter','Be Vietnam Pro',-apple-system,system-ui,sans-serif;
            --font-editorial: 'Fraunces','Be Vietnam Pro',Georgia,serif;
            --font-mono: 'JetBrains Mono',ui-monospace,Menlo,monospace;
        }
        html[data-theme="dark"] {
            --text:#f5f5f7; --text-secondary:#c7c7cf; --text-tertiary:#9b9ba6; --text-muted:#6e6e7a;
            --bg:#0a1628; --bg-alt:#14253f; --bg-soft:#0d1c33; --bg-cream:#14213a;
            --border:#2d3a52; --border-light:#1f2b41; --border-soft:#182238;
        }

        * { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; }
        body { font-family: var(--font-body); color: var(--text); background: var(--bg); line-height: 1.55; font-size: 16px; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
        a { color: inherit; text-decoration: none; transition: color var(--transition); }
        a:hover { color: var(--apple-blue-link); }
        img { max-width: 100%; display: block; height: auto; }
        button { font: inherit; cursor: pointer; background: none; border: none; color: inherit; }
        ul, ol { list-style: none; }
        ::selection { background: var(--apple-blue); color: #fff; }

        .wrap { width: 100%; max-width: var(--max-w); margin: 0 auto; padding: 0 clamp(16px, 3vw, 32px); }
        .wrap-read { width: 100%; max-width: var(--max-w-read); margin: 0 auto; padding: 0 clamp(16px, 3vw, 24px); }

        .scroll-progress { position: fixed; top: 0; left: 0; width: 0%; height: 3px; background: linear-gradient(90deg, var(--energy), var(--coral) 30%, var(--apple-blue) 65%, var(--mint)); z-index: 9999; transition: width 0.06s linear; }

        .skip-link { position: absolute; top: -100px; left: 16px; z-index: 9999; padding: 10px 18px; border-radius: var(--radius-pill); background: var(--text); color: #fff; font-weight: 600; font-size: 14px; box-shadow: 0 8px 24px rgba(0,0,0,0.20); transition: top var(--transition); }
        .skip-link:focus-visible { top: 12px; outline: 3px solid var(--energy); outline-offset: 3px; color: #fff; }

        /* ===== Header (shared chrome) ===== */
        .site-header { position: sticky; top: 0; z-index: 100; background: rgba(255,255,255,0.78); backdrop-filter: saturate(180%) blur(20px); -webkit-backdrop-filter: saturate(180%) blur(20px); border-bottom: 1px solid transparent; transition: border-color var(--transition), background var(--transition); }
        html[data-theme="dark"] .site-header { background: rgba(10,22,40,0.72); }
        .site-header.is-scrolled { border-bottom-color: var(--border-light); background: rgba(255,255,255,0.92); }
        html[data-theme="dark"] .site-header.is-scrolled { background: rgba(10,22,40,0.92); border-bottom-color: var(--border-light); }
        .site-header__inner { display: flex; align-items: center; justify-content: space-between; height: 68px; gap: 16px; }
        .brand { display: inline-flex; align-items: center; gap: 10px; flex-shrink: 0; white-space: nowrap; }
        .brand__mark { width: 36px; height: 36px; border-radius: 10px; background: linear-gradient(135deg, #1d1d1f, #0a1628); color: #fff; display: grid; place-items: center; font-family: var(--font-editorial); font-weight: 600; font-style: italic; font-size: 19px; letter-spacing: -0.02em; box-shadow: 0 6px 16px rgba(10,22,40,0.18); }
        html[data-theme="dark"] .brand__mark { background: linear-gradient(135deg, #fff, #d2d2d7); color: #060e1c; }
        .brand__name { font-family: var(--font-display); font-weight: 700; font-size: 17px; color: var(--text); }
        .brand__chip { font-family: var(--font-editorial); font-style: italic; font-weight: 500; font-size: 12px; padding: 3px 10px; border-radius: var(--radius-pill); background: linear-gradient(135deg, var(--energy), var(--coral)); color: #fff; box-shadow: 0 4px 12px rgba(255,107,53,0.28); }
        .header-back { display: inline-flex; align-items: center; gap: 8px; padding: 8px 14px; border-radius: var(--radius-pill); font-size: 13.5px; font-weight: 500; color: var(--text-secondary); border: 1px solid var(--border-light); background: rgba(255,255,255,0.5); transition: all var(--transition); }
        .header-back__short, .site-header__cta-short { display: none; }
        html[data-theme="dark"] .header-back { background: rgba(255,255,255,0.05); border-color: var(--border-light); color: var(--text-secondary); }
        .header-back:hover { background: var(--bg-alt); color: var(--text); transform: translateY(-1px); }
        .header-back svg { width: 14px; height: 14px; }
        .site-header__cta { display: inline-flex; align-items: center; gap: 8px; padding: 9px 18px; border-radius: var(--radius-pill); background: var(--text); color: #fff; font-weight: 600; font-size: 14px; transition: all var(--transition); box-shadow: 0 4px 14px rgba(0,0,0,0.14); }
        html[data-theme="dark"] .site-header__cta { background: #fff; color: var(--ink); }
        .site-header__cta:hover { background: var(--apple-blue); color: #fff; transform: translateY(-1px); }
        .site-header__cta .dot { width: 7px; height: 7px; background: var(--energy); border-radius: 50%; box-shadow: 0 0 0 3px rgba(255,107,53,0.22); animation: pulse-dot 2.2s ease-in-out infinite; }
        @keyframes pulse-dot { 0%,100% { box-shadow: 0 0 0 3px rgba(255,107,53,0.22); } 50% { box-shadow: 0 0 0 6px rgba(255,107,53,0.06); } }

        .header-theme-btn { width: 40px; height: 40px; display: inline-flex; align-items: center; justify-content: center; border-radius: 10px; color: var(--text-secondary); transition: all var(--transition); position: relative; flex-shrink: 0; }
        .header-theme-btn:hover { background: var(--bg-alt); color: var(--text); transform: translateY(-1px); }
        .header-theme-btn svg { width: 18px; height: 18px; }
        .header-theme-btn .theme-icon { position: absolute; top: 50%; left: 50%; transform: translate(-50%,-50%) rotate(0deg) scale(1); transition: transform 0.5s cubic-bezier(0.34,1.56,0.64,1), opacity 0.3s ease; }
        .header-theme-btn .theme-icon--moon { opacity: 0; transform: translate(-50%,-50%) rotate(-90deg) scale(0.4); }
        html[data-theme="dark"] .header-theme-btn .theme-icon--sun { opacity: 0; transform: translate(-50%,-50%) rotate(90deg) scale(0.4); }
        html[data-theme="dark"] .header-theme-btn .theme-icon--moon { opacity: 1; transform: translate(-50%,-50%) rotate(0deg) scale(1); }

        /* ===== Article hero ===== */
        .article-hero { padding: clamp(40px, 6vw, 80px) 0 clamp(28px, 4vw, 48px); position: relative; }
        .breadcrumb { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; font-family: var(--font-mono); font-size: 11.5px; letter-spacing: 0.10em; color: var(--text-tertiary); text-transform: uppercase; margin-bottom: 18px; }
        .breadcrumb a { color: var(--text-tertiary); transition: color var(--transition); }
        .breadcrumb a:hover { color: var(--text); }
        .breadcrumb__sep { opacity: 0.5; }
        .breadcrumb__current { color: var(--text); }

        .article-hero__zone-chip { display: inline-flex; align-items: center; gap: 6px; padding: 5px 12px; border-radius: var(--radius-pill); background: var(--energy-soft); color: var(--energy); font-family: var(--font-mono); font-size: 11px; font-weight: 500; letter-spacing: 0.14em; text-transform: uppercase; margin-bottom: 18px; }
        html[data-theme="dark"] .article-hero__zone-chip { background: rgba(255,107,53,0.14); color: var(--energy); }
        .article-hero__zone-chip::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--energy); box-shadow: 0 0 0 3px rgba(255,107,53,0.20); }

        .article-hero__title { font-family: var(--font-display); font-weight: 700; font-size: clamp(34px, 5.4vw, 64px); line-height: 1.05; letter-spacing: -0.028em; color: var(--text); text-wrap: balance; max-width: 880px; margin-bottom: 22px; }
        .article-hero__lede { font-family: var(--font-editorial); font-style: italic; font-weight: 500; font-size: clamp(18px, 2vw, 24px); line-height: 1.45; color: var(--text-secondary); max-width: 720px; margin-bottom: 26px; text-wrap: balance; }

        .article-hero__meta { display: flex; flex-wrap: wrap; align-items: center; gap: 18px; padding: 16px 0; border-top: 1px solid var(--border-soft); border-bottom: 1px solid var(--border-soft); }
        .author-stack { display: inline-flex; align-items: center; }
        .author-stack__avatar { width: 30px; height: 30px; border-radius: 50%; display: inline-flex; align-items: center; justify-content: center; color: #fff; font-family: var(--font-display); font-weight: 600; font-size: 12px; border: 2px solid var(--bg); box-shadow: 0 2px 6px rgba(0,0,0,0.10); margin-left: -8px; position: relative; }
        .author-stack__avatar:first-child { margin-left: 0; }
        .author-stack__avatar:nth-child(1) { z-index: 3; }
        .author-stack__avatar:nth-child(2) { z-index: 2; }
        .author-stack__avatar:nth-child(3) { z-index: 1; }
        .meta-item { display: inline-flex; align-items: center; gap: 8px; font-size: 13px; color: var(--text-secondary); }
        .meta-item__label { font-family: var(--font-mono); font-size: 10.5px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--text-tertiary); }
        .meta-item--strong { color: var(--text); font-weight: 500; }
        .meta-dot { width: 3px; height: 3px; background: var(--text-tertiary); border-radius: 50%; opacity: 0.5; }

        /* ===== Article cover ===== */
        .article-cover { padding: 0 0 clamp(36px, 5vw, 60px); }
        .article-cover__media { position: relative; aspect-ratio: 21/9; border-radius: var(--radius-2xl); overflow: hidden; background: var(--bg-alt); box-shadow: var(--shadow-lg); }
        .article-cover__media img { width: 100%; height: 100%; object-fit: cover; opacity: 0; transition: opacity 0.3s ease; }
        .article-cover__media img.is-loaded { opacity: 1; }
        .article-cover__caption { margin-top: 14px; font-family: var(--font-editorial); font-style: italic; font-size: 14px; color: var(--text-tertiary); text-align: center; }

        /* ===== Article body ===== */
        .article-body { padding: 0 0 clamp(48px, 6vw, 80px); position: relative; }
        .article-body__content {
            font-family: var(--font-body); font-size: 18.5px; line-height: 1.72; color: var(--text);
            letter-spacing: -0.003em;
        }
        .article-body__content > *:first-child::first-letter {
            font-family: var(--font-editorial); font-style: italic; font-weight: 600;
            font-size: 4.4em; line-height: 0.85;
            float: left; margin: 8px 14px 0 0;
            background: linear-gradient(135deg, var(--energy), var(--coral) 55%, var(--apple-blue));
            -webkit-background-clip: text; background-clip: text;
            -webkit-text-fill-color: transparent;
            letter-spacing: -0.04em;
        }
        .article-body__content p { margin: 0 0 1.2em; }
        .article-body__content h2 { font-family: var(--font-display); font-weight: 700; font-size: clamp(24px, 3vw, 32px); line-height: 1.18; letter-spacing: -0.018em; margin: 1.6em 0 0.5em; color: var(--text); text-wrap: balance; }
        .article-body__content h3 { font-family: var(--font-display); font-weight: 600; font-size: clamp(20px, 2.4vw, 24px); line-height: 1.22; letter-spacing: -0.014em; margin: 1.4em 0 0.4em; color: var(--text); }
        .article-body__content h4 { font-family: var(--font-display); font-weight: 600; font-size: 17px; margin: 1.2em 0 0.3em; color: var(--text); }
        .article-body__content blockquote { margin: 1.4em 0; padding: 6px 0 6px 22px; border-left: 3px solid var(--apple-blue); font-family: var(--font-editorial); font-style: italic; font-size: 1.08em; color: var(--text-secondary); }
        .article-body__content ul, .article-body__content ol { padding-left: 1.5em; margin: 0 0 1.2em; }
        .article-body__content ul { list-style: disc; }
        .article-body__content ol { list-style: decimal; }
        .article-body__content li { margin: 0.4em 0; }
        .article-body__content a { color: var(--apple-blue-link); text-decoration: underline; text-underline-offset: 3px; text-decoration-thickness: 1.5px; }
        .article-body__content a:hover { color: var(--apple-blue); }
        .article-body__content code { font-family: var(--font-mono); font-size: 0.92em; background: var(--bg-alt); padding: 2px 6px; border-radius: 4px; }
        .article-body__content pre { background: var(--bg-alt); border-radius: var(--radius-lg); padding: 18px; margin: 1.4em 0; overflow-x: auto; font-family: var(--font-mono); font-size: 14px; line-height: 1.6; }
        .article-body__content img { border-radius: var(--radius-lg); margin: 1.4em auto; box-shadow: var(--shadow); max-width: 100%; }
        .article-body__content hr { border: 0; border-top: 1px solid var(--border-light); margin: 2em auto; max-width: 200px; }

        .article-body__empty { padding: 48px 24px; text-align: center; border: 1px dashed var(--border); border-radius: var(--radius-xl); color: var(--text-tertiary); }
        .article-body__empty em { font-family: var(--font-editorial); font-style: italic; color: var(--text-secondary); font-size: 1.2em; }

        /* ===== Article footer card ===== */
        .article-footer-card {
            margin: clamp(40px, 5vw, 64px) 0;
            padding: clamp(24px, 3vw, 36px);
            background: var(--bg-cream); border-radius: var(--radius-2xl);
            display: flex; align-items: center; gap: 18px; flex-wrap: wrap; justify-content: space-between;
            position: relative; overflow: hidden;
        }
        html[data-theme="dark"] .article-footer-card { background: var(--bg-alt); border: 1px solid var(--border-light); }
        .article-footer-card::before { content: ""; position: absolute; inset: 0; background: radial-gradient(40% 60% at 100% 0%, rgba(255,107,53,0.10), transparent 70%); pointer-events: none; }
        .article-footer-card__brand { display: flex; align-items: center; gap: 12px; position: relative; }
        .article-footer-card__brand-mark { width: 40px; height: 40px; border-radius: 10px; background: linear-gradient(135deg, #1d1d1f, #0a1628); color: #fff; display: grid; place-items: center; font-family: var(--font-editorial); font-style: italic; font-weight: 600; font-size: 20px; flex-shrink: 0; }
        html[data-theme="dark"] .article-footer-card__brand-mark { background: linear-gradient(135deg, #fff, #d2d2d7); color: var(--ink); }
        .article-footer-card__brand-text strong { display: block; font-family: var(--font-display); font-weight: 600; font-size: 15px; color: var(--text); margin-bottom: 2px; }
        .article-footer-card__brand-text span { font-size: 13px; color: var(--text-secondary); }
        .article-footer-card__actions { display: flex; gap: 10px; flex-wrap: wrap; position: relative; }
        .article-action {
            display: inline-flex; align-items: center; gap: 8px;
            padding: 10px 18px; border-radius: var(--radius-pill);
            font-weight: 600; font-size: 14px;
            transition: all var(--transition);
            border: 1px solid var(--border-light);
            background: rgba(255,255,255,0.6); color: var(--text);
        }
        html[data-theme="dark"] .article-action { background: rgba(255,255,255,0.05); color: var(--text); }
        .article-action:hover { transform: translateY(-1px); background: var(--text); color: #fff; border-color: var(--text); }
        html[data-theme="dark"] .article-action:hover { background: #fff; color: var(--ink); border-color: #fff; }
        .article-action--primary { background: linear-gradient(135deg, var(--energy), var(--coral)); color: #fff; border-color: transparent; box-shadow: 0 8px 20px rgba(255,107,53,0.32); }
        .article-action--primary:hover { color: #fff; background: linear-gradient(135deg, var(--coral), var(--energy)); transform: translateY(-2px); box-shadow: 0 14px 30px rgba(255,107,53,0.46); }
        .article-action svg { width: 15px; height: 15px; }

        /* ===== Related articles ===== */
        .related { padding: clamp(40px, 5vw, 64px) 0 clamp(48px, 6vw, 80px); border-top: 1px solid var(--border-light); }
        .related__head { display: flex; align-items: flex-end; justify-content: space-between; flex-wrap: wrap; gap: 16px; margin-bottom: 28px; }
        .related__title { font-family: var(--font-display); font-weight: 600; font-size: clamp(22px, 2.6vw, 30px); line-height: 1.12; letter-spacing: -0.018em; color: var(--text); text-wrap: balance; }
        .related__title em { font-family: var(--font-editorial); font-style: italic; font-weight: 500; background: linear-gradient(135deg, var(--energy), var(--coral) 35%, var(--apple-blue)); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
        .eyebrow { display: inline-flex; align-items: center; gap: 8px; font-family: var(--font-mono); font-size: 11px; font-weight: 500; letter-spacing: 0.14em; text-transform: uppercase; color: var(--apple-blue-link); }
        .eyebrow::before { content: ""; width: 24px; height: 1.5px; background: linear-gradient(90deg, var(--energy), var(--apple-blue)); }
        .related__link { display: inline-flex; align-items: center; gap: 6px; font-size: 14px; font-weight: 500; color: var(--apple-blue-link); }
        .related__link:hover { gap: 10px; }
        .related__link svg { width: 14px; height: 14px; }
        .related-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: clamp(18px, 2vw, 28px); }
        @media (max-width: 1024px) { .related-grid { grid-template-columns: repeat(2, 1fr); } }
        @media (max-width: 520px) { .related-grid { grid-template-columns: 1fr; } }
        .related-card { display: flex; flex-direction: column; background: var(--bg); border-radius: var(--radius-lg); overflow: hidden; border: 1px solid var(--border-soft); transition: all var(--transition); }
        html[data-theme="dark"] .related-card { background: var(--bg-alt); border-color: var(--border-light); }
        .related-card:hover { transform: translateY(-3px); border-color: var(--border); box-shadow: var(--shadow); }
        .related-card__media { aspect-ratio: 5/3; overflow: hidden; background: var(--bg-alt); }
        .related-card__media img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.6s ease; opacity: 0; }
        .related-card__media img.is-loaded { opacity: 1; }
        .related-card:hover .related-card__media img.is-loaded { transform: scale(1.05); }
        .related-card__body { padding: 16px; display: flex; flex-direction: column; gap: 8px; flex: 1; }
        .related-card__title { font-family: var(--font-display); font-weight: 600; font-size: 15px; line-height: 1.32; color: var(--text); text-wrap: balance; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
        .related-card__meta { margin-top: auto; padding-top: 8px; border-top: 1px solid var(--border-soft); font-family: var(--font-mono); font-size: 10.5px; color: var(--text-tertiary); letter-spacing: 0.06em; }

        /* ===== Footer ===== */
        .site-footer { background: var(--bg-cream); padding: 64px 0 32px; margin-top: 32px; }
        html[data-theme="dark"] .site-footer { background: var(--bg-soft); border-top: 1px solid var(--border-light); }
        .footer-inner { display: grid; grid-template-columns: 1.5fr 1fr 1fr; gap: 36px; margin-bottom: 32px; }
        .footer-brand p { color: var(--text-secondary); font-size: 14px; line-height: 1.6; margin-top: 12px; max-width: 360px; }
        .footer-col h4 { font-family: var(--font-display); font-weight: 600; font-size: 13px; margin-bottom: 14px; color: var(--text); }
        .footer-col ul { display: flex; flex-direction: column; gap: 10px; }
        .footer-col a { font-size: 14px; color: var(--text-secondary); }
        .footer-col a:hover { color: var(--apple-blue-link); }
        .footer-bottom { border-top: 1px solid var(--border-soft); padding-top: 24px; display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; font-family: var(--font-mono); font-size: 12px; color: var(--text-tertiary); letter-spacing: 0.04em; }
        @media (max-width: 768px) { .footer-inner { grid-template-columns: 1fr 1fr; } .footer-brand { grid-column: 1 / -1; } }

        /* ===== 404-ish empty ===== */
        .article-missing { padding: clamp(80px, 12vw, 140px) 0; text-align: center; }
        .article-missing__num { font-family: var(--font-editorial); font-style: italic; font-weight: 500; font-size: clamp(80px, 14vw, 160px); line-height: 1; background: linear-gradient(135deg, var(--energy), var(--coral) 50%, var(--apple-blue)); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; letter-spacing: -0.04em; }
        .article-missing__title { font-family: var(--font-display); font-weight: 600; font-size: clamp(24px, 3vw, 32px); color: var(--text); margin: 20px 0 10px; }
        .article-missing__sub { font-size: 16px; color: var(--text-secondary); max-width: 480px; margin: 0 auto 28px; }

        /* Mobile nav-back replacement */
        @media (max-width: 720px) {
            .header-back__label-full, .site-header__cta-label { display: none; }
            .header-back__short, .site-header__cta-short { display: inline; }
            .header-back { min-height: 44px; padding: 8px 12px; }
            .site-header__cta { min-height: 44px; padding: 9px 12px; }
            .brand__chip { display: none; }
            .article-hero__title { font-size: clamp(28px, 8vw, 44px); }
            .article-body__content { font-size: 17px; }
            .article-body__content > *:first-child::first-letter { font-size: 3.6em; }
            .article-cover__media { aspect-ratio: 3 / 2; border-radius: var(--radius-xl); }
        }