:root {
          --bg: #fbfaf7;
          --bg-soft: #f3f1ec;
          --surface: #ffffff;
          --surface-secondary: #f8f6f1;
          --text-primary: #1a1a1a;
          --text-secondary: #4a4a4a;
          --text-muted: #767676;
          --border: #e8e4dc;
          --border-strong: #d8d2c5;
          --brand: #0f766e;
          --brand-soft: #ccfbf1;
          --brand-deep: #134e4a;
          --accent: #b45309;
          --accent-soft: #fef3c7;
          --green-pill: #16a34a;
          --green-pill-bg: #dcfce7;
          --red-pill: #dc2626;
          --red-pill-bg: #fee2e2;
          --amber-star: #f59e0b;
          --shadow-sm: 0 1px 2px rgba(20,20,20,.04), 0 2px 8px rgba(20,20,20,.04);
          --shadow-default: 0 4px 24px rgba(20,20,20,.06);
          --shadow-lg: 0 12px 40px rgba(20,20,20,.08);
          --radius-sm: 8px;
          --radius-default: 14px;
          --radius-lg: 22px;
          --radius-pill: 9999px;
          --transition: 0.25s cubic-bezier(.4,0,.2,1);
          --font-ui: -apple-system, BlinkMacSystemFont, sans-serif;
          --font-display:  -apple-system, sans-serif;
          --font-editorial: Georgia, serif;
          --max-site: 1240px;
          --max-article: 720px;
          --z-dropdown: 100;
          --z-sticky-bar: 200;
          --z-mobile-menu: 300;
          --z-modal: 400;
          --z-toast: 500;
          --space-1: 4px; --space-2: 8px; --space-3: 12px; --space-4: 16px; --space-5: 24px; --space-6: 32px; --space-7: 48px; --space-8: 64px;
        }

        /* ===== DARK THEME TOKENS ===== */
        [data-theme="dark"] {
          --bg: #14181b; --bg-soft: #1a1f23; --surface: #1c2226; --surface-secondary: #20262a;
          --text-primary: #f1f1ef; --text-secondary: #c4c4c2; --text-muted: #8f9396;
          --border: #2a3136; --border-strong: #3a4247; --brand: #2dd4bf; --brand-soft: #0f2e2b;
          --brand-deep: #5eead4; --accent: #f59e0b; --accent-soft: #422006;
          --green-pill: #4ade80; --green-pill-bg: #052e16; --red-pill: #f87171; --red-pill-bg: #450a0a;
          --shadow-sm: 0 1px 2px rgba(0,0,0,.15), 0 2px 8px rgba(0,0,0,.15);
          --shadow-default: 0 4px 24px rgba(0,0,0,.2); --shadow-lg: 0 12px 40px rgba(0,0,0,.3);
        }

        /* ===== RESET & BASE ===== */
        *, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
        html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
        body {
          font-family: var(--font-ui); background: var(--bg); color: var(--text-primary);
          line-height: 1.7; font-size: 16px; overflow-x: hidden;
        }
        ::selection { background: var(--brand-soft); color: var(--brand-deep); }
        *:focus-visible { outline: 2px solid var(--brand); outline-offset: 2px; border-radius: var(--radius-sm); }
        img { display: block; max-width: 100%; height: auto; }

        /* ===== ANIMATIONS ===== */
        @keyframes fadeInUp { from { opacity: 0; transform: translateY(16px); } to { opacity: 1; transform: translateY(0); } }
        @keyframes slideDown { from { opacity: 0; transform: translateY(-8px); } to { opacity: 1; transform: translateY(0); } }
        @keyframes stickyBarIn { from { opacity: 0; transform: translateY(100%); } to { opacity: 1; transform: translateY(0); } }

        @media (prefers-reduced-motion: reduce) {
          *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
          html { scroll-behavior: auto; }
        }

        .fade-in { opacity: 0; animation: fadeInUp 0.6s var(--transition) forwards; }
        .delay-1 { animation-delay: 100ms; } .delay-2 { animation-delay: 200ms; } .delay-3 { animation-delay: 300ms; }

        /* ===== CONTAINER ===== */
        .container { max-width: var(--max-article); margin: 0 auto; padding: 0 var(--space-5); }
        .container-wide { max-width: var(--max-site); margin: 0 auto; padding: 0 var(--space-5); }

        /* ===== NAVIGATION ===== */
        .nav { position: sticky; top: 0; z-index: var(--z-dropdown); background: var(--surface); border-bottom: 1px solid var(--border); }
        .nav-inner { max-width: var(--max-site); margin: 0 auto; padding: var(--space-4) var(--space-5); display: flex; align-items: center; justify-content: space-between; }
        .nav-logo { font-family: var(--font-display); font-size: 1.25rem; font-weight: 800; color: var(--text-primary); text-decoration: none; letter-spacing: -0.02em; }
        .nav-logo span { color: var(--brand); }
        .nav-actions { display: flex; align-items: center; gap: var(--space-2); }
        .nav-links { display: none; gap: var(--space-6); list-style: none; }
        @media (min-width: 768px) { .nav-links { display: flex; } }
        .nav-links a { color: var(--text-muted); text-decoration: none; font-size: 0.875rem; font-weight: 500; transition: color var(--transition); }
        .nav-links a:hover { color: var(--brand); }
        .nav-mobile-btn { display: flex; align-items: center; justify-content: center; width: 40px; height: 40px; border: 1px solid var(--border); border-radius: var(--radius-sm); background: var(--surface); color: var(--text-primary); cursor: pointer; transition: all var(--transition); }
        @media (min-width: 768px) { .nav-mobile-btn { display: none; } }
        .nav-mobile-btn:hover { border-color: var(--border-strong); background: var(--surface-secondary); }

        /* Theme Toggle Button */
        .theme-toggle { width: 40px; height: 40px; border: 1px solid var(--border); border-radius: var(--radius-sm); background: var(--surface); color: var(--text-primary); cursor: pointer; display: flex; align-items: center; justify-content: center; transition: all var(--transition); }
        .theme-toggle:hover { border-color: var(--border-strong); background: var(--surface-secondary); }

        /* Mobile Menu */
        .mobile-menu { display: none; position: fixed; inset: 0; z-index: var(--z-mobile-menu); background: var(--bg); padding: var(--space-6) var(--space-5); }
        .mobile-menu.open { display: flex; flex-direction: column; }
        .mobile-menu-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: var(--space-7); }
        .mobile-menu-close { width: 40px; height: 40px; border: 1px solid var(--border); border-radius: var(--radius-sm); background: var(--surface); color: var(--text-primary); cursor: pointer; display: flex; align-items: center; justify-content: center; transition: all var(--transition); }
        .mobile-menu-close:hover { border-color: var(--border-strong); }
        .mobile-menu-links { list-style: none; display: flex; flex-direction: column; gap: var(--space-4); }
        .mobile-menu-links a { font-family: var(--font-display); font-size: 1.25rem; font-weight: 600; color: var(--text-primary); text-decoration: none; padding: var(--space-3) 0; border-bottom: 1px solid var(--border); transition: color var(--transition); }
        .mobile-menu-links a:hover { color: var(--brand); }

        /* ===== BREADCRUMBS ===== */
        .breadcrumbs { padding: var(--space-4) 0 0; }
        .breadcrumbs-list { display: flex; align-items: center; gap: var(--space-2); list-style: none; flex-wrap: wrap; font-size: 0.8125rem; }
        .breadcrumbs-sep { color: var(--text-muted); font-size: 0.75rem; }
        .breadcrumbs-list a { color: var(--text-muted); text-decoration: none; transition: color var(--transition); }
        .breadcrumbs-list a:hover { color: var(--brand); }
        .breadcrumbs-list .current { color: var(--text-secondary); font-weight: 500; }

        /* ===== HERO ===== */
        .hero { padding: var(--space-7) 0 var(--space-6); }
        .hero-grid { display: grid; grid-template-columns: 1fr; gap: var(--space-6); align-items: center; }
        @media (min-width: 768px) { .hero-grid { grid-template-columns: 1fr 1fr; gap: var(--space-7); } }
        .hero-badge { display: inline-flex; align-items: center; gap: var(--space-2); padding: var(--space-1) var(--space-3); border-radius: var(--radius-pill); border: 1px solid var(--border); background: var(--surface-secondary); font-size: 0.75rem; font-weight: 600; color: var(--text-muted); letter-spacing: 0.04em; text-transform: uppercase; margin-bottom: var(--space-4); }
        .hero-badge-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--brand); }
        .hero h1 { font-family: var(--font-display); font-size: clamp(1.75rem, 4vw, 2.5rem); font-weight: 800; line-height: 1.15; letter-spacing: -0.03em; margin-bottom: var(--space-4); color: var(--text-primary); }
        .hero-sub { font-size: 1.0625rem; color: var(--text-secondary); line-height: 1.65; margin-bottom: var(--space-5); }
        .hero-meta { display: flex; align-items: center; gap: var(--space-5); flex-wrap: wrap; font-size: 0.8125rem; color: var(--text-muted); }
        .hero-meta-item { display: flex; align-items: center; gap: var(--space-2); }

        /* ===== DISCLOSURE BOXES ===== */
        .disclosure-box { background: var(--surface-secondary); border: 1px solid var(--border); border-radius: var(--radius-default); padding: var(--space-5); margin-bottom: var(--space-6); font-size: 0.8125rem; color: var(--text-muted); line-height: 1.75; }
        .disclosure-box p + p { margin-top: var(--space-2); }
        .disclosure-box strong { color: var(--text-secondary); font-weight: 600; }

        /* ===== SECTION STYLING ===== */
        .section { margin-bottom: var(--space-7); }
        .section h2 { font-family: var(--font-display); font-size: 1.375rem; font-weight: 700; letter-spacing: -0.02em; margin-bottom: var(--space-5); padding-bottom: var(--space-4); border-bottom: 1px solid var(--border); display: flex; align-items: center; gap: var(--space-3); }
        .h2-icon { width: 28px; height: 28px; border-radius: var(--radius-sm); background: var(--brand-soft); display: flex; align-items: center; justify-content: center; flex-shrink: 0; color: var(--brand); }
        .section h3 { font-family: var(--font-display); font-size: 1.0625rem; font-weight: 700; letter-spacing: -0.01em; margin-bottom: var(--space-3); margin-top: var(--space-6); color: var(--text-primary); }
        .article-body p { font-family: var(--font-editorial); color: var(--text-secondary); margin-bottom: var(--space-4); font-size: 0.975rem; line-height: 1.8; }
        .article-body ul { list-style: none; margin-bottom: var(--space-4); display: flex; flex-direction: column; gap: var(--space-2); }
        .article-body ul li { font-family: var(--font-editorial); color: var(--text-secondary); font-size: 0.975rem; padding-left: var(--space-4); position: relative; line-height: 1.7; }
        .article-body ul li::before { content: ''; position: absolute; left: 0; top: 0.6em; width: 5px; height: 5px; border-radius: 50%; background: var(--brand); }
        .article-body ol { list-style: none; margin-bottom: var(--space-4); display: flex; flex-direction: column; gap: var(--space-2); counter-reset: item; }
        .article-body ol li { font-family: var(--font-editorial); color: var(--text-secondary); font-size: 0.975rem; padding-left: var(--space-5); position: relative; line-height: 1.7; counter-increment: item; }
        .article-body ol li::before { content: counter(item); position: absolute; left: 0; top: 0; width: 20px; height: 20px; background: var(--brand-soft); color: var(--brand); border-radius: 50%; text-align: center; line-height: 20px; font-size: 0.75rem; font-weight: 700; font-family: var(--font-ui); }

        /* ===== CALLOUT BOXES ===== */
        .callout { border-radius: var(--radius-default); padding: var(--space-4) var(--space-5); margin: var(--space-5) 0; font-size: 0.875rem; color: var(--text-secondary); display: flex; align-items: flex-start; gap: var(--space-3); font-family: var(--font-ui); line-height: 1.65; }
        .callout-icon { flex-shrink: 0; margin-top: 2px; }
        .callout-green { background: var(--brand-soft); border: 1px solid var(--brand); }
        .callout-green .callout-icon { color: var(--brand); }
        .callout-amber { background: var(--accent-soft); border: 1px solid var(--border-strong); }
        .callout-amber .callout-icon { color: var(--accent); }
        .callout-blue { background: #eff6ff; border: 1px solid #93c5fd; }
        [data-theme="dark"] .callout-blue { background: #172554; border-color: #1e40af; }
        .callout-blue .callout-icon { color: #3b82f6; }

        /* ===== FAQ ACCORDION ===== */
        .faq-section { margin-bottom: var(--space-7); }
        .faq-section > h2 { margin-bottom: var(--space-5); }
        .faq-item { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-default); margin-bottom: var(--space-2); overflow: hidden; transition: all var(--transition); }
        .faq-item.active { border-color: var(--brand); box-shadow: var(--shadow-sm); }
        .faq-question { width: 100%; display: flex; align-items: center; justify-content: space-between; gap: var(--space-4); padding: var(--space-4) var(--space-5); background: transparent; border: none; color: var(--text-primary); font-family: var(--font-display); font-size: 0.9375rem; font-weight: 600; text-align: left; cursor: pointer; transition: color var(--transition); line-height: 1.4; }
        .faq-question:hover { color: var(--brand); }
        .faq-chevron { flex-shrink: 0; width: 20px; height: 20px; color: var(--text-muted); transition: transform var(--transition), color var(--transition); display: flex; align-items: center; justify-content: center; }
        .faq-item.active .faq-chevron { transform: rotate(180deg); color: var(--brand); }
        .faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.35s var(--transition); }
        .faq-answer-inner { padding: 0 var(--space-5) var(--space-5); color: var(--text-secondary); font-family: var(--font-editorial); font-size: 0.875rem; line-height: 1.75; }

        /* ===== SOURCES ===== */
        .sources-list { list-style: none; display: grid; grid-template-columns: 1fr; gap: var(--space-2); }
        @media (min-width: 640px) { .sources-list { grid-template-columns: 1fr 1fr; } }
        .sources-list li { font-size: 0.8125rem; color: var(--text-muted); padding-left: var(--space-4); position: relative; line-height: 1.5; }
        .sources-list li::before { content: '—'; position: absolute; left: 0; color: var(--text-muted); opacity: 0.5; }

        /* ===== EDITORIAL NOTE ===== */
        .editorial-note { background: var(--surface-secondary); border: 1px solid var(--border); border-radius: var(--radius-default); padding: var(--space-5); margin-bottom: var(--space-7); font-size: 0.8125rem; color: var(--text-muted); line-height: 1.75; }
        .editorial-note strong { color: var(--text-secondary); font-weight: 600; display: block; margin-bottom: var(--space-2); font-size: 0.875rem; }

        /* ===== FOOTER ===== */
        .footer { border-top: 1px solid var(--border); padding: var(--space-7) 0; margin-top: var(--space-7); }
        .footer-inner { max-width: var(--max-site); margin: 0 auto; padding: 0 var(--space-5); }
        .footer-grid { display: grid; grid-template-columns: 1fr; gap: var(--space-7); margin-bottom: var(--space-7); }
        @media (min-width: 640px) { .footer-grid { grid-template-columns: 2fr 1fr 1fr; } }
        .footer-brand p { font-size: 0.8125rem; color: var(--text-muted); margin-top: var(--space-3); line-height: 1.6; max-width: 320px; }
        .footer-heading { font-family: var(--font-display); font-size: 0.75rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-muted); margin-bottom: var(--space-3); }
        .footer-links { list-style: none; display: flex; flex-direction: column; gap: var(--space-2); }
        .footer-links a { font-size: 0.8125rem; color: var(--text-secondary); text-decoration: none; transition: color var(--transition); }
        .footer-links a:hover { color: var(--brand); }
        .footer-bottom { border-top: 1px solid var(--border); padding-top: var(--space-5); display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: var(--space-3); font-size: 0.75rem; color: var(--text-muted); }
        .footer-bottom a { color: var(--text-muted); text-decoration: none; }
        .footer-bottom a:hover { color: var(--brand); }

        /* ===== SCROLL REVEAL ===== */
        .reveal { opacity: 0; transform: translateY(16px); transition: opacity 0.6s var(--transition), transform 0.6s var(--transition); }
        .reveal.visible { opacity: 1; transform: translateY(0); }

        /* ===== SCROLL OFFSET ===== */
        [id] { scroll-margin-top: 80px; }

        /* ===== BACK TO TOP ===== */
        .back-to-top { position: fixed; bottom: var(--space-5); right: var(--space-5); z-index: var(--z-dropdown); width: 44px; height: 44px; border-radius: var(--radius-sm); border: 1px solid var(--border); background: var(--surface); color: var(--text-primary); cursor: pointer; display: flex; align-items: center; justify-content: center; box-shadow: var(--shadow-sm); transition: all var(--transition); opacity: 0; pointer-events: none; transform: translateY(8px); }
        .back-to-top.visible { opacity: 1; pointer-events: auto; transform: translateY(0); }
        .back-to-top:hover { border-color: var(--brand); color: var(--brand); box-shadow: var(--shadow-default); }