:root {
            color-scheme: light dark;
            /* Brand Color System */
            --color-primary-50: #f7faeb;
            --color-primary-100: #edf4d3;
            --color-primary-200: #dbeaac;
            --color-primary-300: #cae08d;
            --color-primary-400: #a8c952;
            --color-primary-500: #8aaf33;
            --color-primary-600: #6b8b25;
            --color-primary-700: #526a21;
            --color-primary-800: #43551f;
            --color-primary-900: #3a491e;
            --color-primary-950: #1d270c;

            --color-canvas: #f7faeb;
            --color-surface: #edf4d3;
            --color-divider: #dbeaac;
            --color-ink: #1d270c;
            --color-meta: #526a21;
            --color-accent: #359471;

            --font-headings: 'Inter', -apple-system, sans-serif;
            --font-body: 'Inter', -apple-system, sans-serif;
            --font-mono: 'JetBrains Mono', monospace;
            
            --container-max: 1100px;
            --header-bg: rgba(247, 250, 235, 0.85);
            --body-copy: rgba(29, 39, 12, 0.85);
            --toggle-bg: rgba(29, 39, 12, 0.06);
            --toggle-border: rgba(82, 106, 33, 0.18);
            --toggle-active-bg: #1d270c;
            --toggle-active-text: #f7faeb;
        }

        :root[data-theme="dark"] {
            --color-canvas: #090b07;
            --color-surface: #11150c;
            --color-divider: rgba(219, 234, 172, 0.16);
            --color-ink: #f4f7e8;
            --color-meta: #dbeaac;
            --color-accent: #a8c952;
            --header-bg: rgba(9, 11, 7, 0.86);
            --body-copy: rgba(244, 247, 232, 0.82);
            --toggle-bg: rgba(244, 247, 232, 0.08);
            --toggle-border: rgba(219, 234, 172, 0.16);
            --toggle-active-bg: #f4f7e8;
            --toggle-active-text: #090b07;
        }

        * { 
            box-sizing: border-box; 
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: var(--font-body);
            margin: 0;
            padding: 0;
            background-color: var(--color-canvas);
            color: var(--color-ink);
            line-height: 1.6;
            overflow-x: hidden;
            transition: background-color 0.25s ease, color 0.25s ease;
        }

        /* Film Grain Effect */
        .grain {
            position: fixed;
            top: 0; left: 0; width: 100%; height: 100%;
            pointer-events: none;
            z-index: 9999;
            opacity: 0.04;
            background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Ffilter id='noiseFilter'%3E%3FfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
        }

        /* Header Styling */
        .site-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 1.25rem 2rem;
            border-bottom: 1px solid var(--color-divider);
            position: sticky;
            top: 0;
            background: var(--header-bg);
            backdrop-filter: blur(14px);
            z-index: 100;
            transition:
                opacity 0.3s ease,
                transform 0.3s ease;
        }

        .site-header.site-header-visible {
            opacity: 1;
            transform: translateY(0);
            pointer-events: auto;
        }

        .site-header.site-header-hidden {
            opacity: 0;
            transform: translateY(-1rem);
            pointer-events: none;
        }

        .logo {
            display: inline-flex;
            align-items: center;
            text-decoration: none;
        }

        .logo img {
            height: 1.75rem;
            width: auto;
            display: block;
        }

        .logo .logo-dark {
            display: none;
        }

        :root[data-theme="dark"] .logo .logo-light {
            display: none;
        }

        :root[data-theme="dark"] .logo .logo-dark {
            display: block;
        }

        .header-actions {
            display: flex;
            align-items: center;
            gap: 0.75rem;
            flex-shrink: 0;
        }

        .theme-toggle {
            display: inline-flex;
            align-items: center;
            gap: 0.15rem;
            padding: 0.2rem;
            border-radius: 999px;
            border: 1px solid var(--toggle-border);
            background: var(--toggle-bg);
        }

        .theme-option {
            border: 0;
            background: transparent;
            color: var(--color-meta);
            border-radius: 999px;
            padding: 0;
            width: 2rem;
            height: 2rem;
            font-weight: 600;
            cursor: pointer;
            transition: background-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
            display: inline-flex;
            align-items: center;
            justify-content: center;
        }

        .theme-option[aria-pressed="true"] {
            background: var(--toggle-active-bg);
            color: var(--toggle-active-text);
        }

        .theme-option-icon {
            font-size: 0.88rem;
            line-height: 1;
        }

        .theme-cycle-button {
            display: none;
            border: 1px solid var(--toggle-border);
            background: var(--toggle-bg);
            color: var(--color-meta);
            border-radius: 999px;
            min-width: 2.2rem;
            height: 2.2rem;
            padding: 0 0.7rem;
            font-weight: 600;
            cursor: pointer;
            transition: background-color 0.2s ease, color 0.2s ease, transform 0.2s ease, border-color 0.2s ease;
            align-items: center;
            justify-content: center;
            gap: 0.35rem;
            font-family: var(--font-mono);
            font-size: 0.68rem;
            letter-spacing: 0.08em;
            text-transform: uppercase;
        }

        .theme-cycle-button:hover {
            transform: translateY(-1px);
        }

        .theme-cycle-icon {
            font-size: 0.88rem;
            line-height: 1;
        }

        .theme-cycle-label {
            display: inline;
        }

        .visually-hidden {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            white-space: nowrap;
            border: 0;
        }

        .pill-button {
            background-color: var(--color-ink);
            color: var(--color-canvas);
            border: none;
            padding: 0.6rem 1.5rem;
            border-radius: 9999px;
            font-weight: 600;
            font-size: 0.85rem;
            cursor: pointer;
            transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1);
            text-decoration: none;
            display: inline-flex;
            align-items: center;
        }

        .pill-button:hover {
            transform: scale(1.03);
        }

        .theme-option:hover {
            transform: translateY(-1px);
        }

        /* Hero Section */
        .hero {
            padding: 120px 20px 80px;
            border-bottom: 1px solid var(--color-divider);
            position: relative;
            background-color: var(--color-surface);
        }

        .hero-inner {
            max-width: var(--container-max);
            margin: 0 auto;
            text-align: left;
        }

        .hero h1 {
            font-family: var(--font-headings);
            font-size: clamp(3rem, 8vw, 5rem);
            font-weight: 800;
            margin: 0;
            letter-spacing: -0.04em;
            line-height: 1;
            color: var(--color-ink);
        }

        .mono-label {
            font-family: var(--font-mono);
            text-transform: uppercase;
            letter-spacing: 0.1em;
            color: var(--color-meta);
            font-size: 0.75rem;
            display: block;
            margin-bottom: 1.5rem;
        }

        .last-updated {
            margin-top: 2rem;
            color: var(--color-meta);
            font-family: var(--font-mono);
            font-size: 0.8rem;
            text-transform: uppercase;
        }

        /* Layout Grid */
        .main-grid {
            max-width: var(--container-max);
            margin: 0 auto;
            display: grid;
            grid-template-columns: 1fr 280px;
            gap: 80px;
            padding: 80px 40px;
        }

        /* Content Area */
        .content-area section {
            margin-bottom: 100px;
            scroll-margin-top: 120px;
        }

        .content-area h2 {
            font-family: var(--font-headings);
            font-size: 2.25rem;
            font-weight: 800;
            letter-spacing: -0.03em;
            margin-bottom: 1.5rem;
            color: var(--color-ink);
            line-height: 1.1;
        }

        .content-area h3 {
            font-family: var(--font-headings);
            font-size: 1.25rem;
            font-weight: 700;
            margin: 2.5rem 0 1rem;
            color: var(--color-ink);
        }

        .content-area p {
            font-size: 1.125rem;
            color: var(--body-copy);
            margin-bottom: 1.5rem;
        }

        .content-area ul {
            padding-left: 1.5rem;
            margin-bottom: 2rem;
        }

        .content-area li {
            margin-bottom: 0.85rem;
            font-size: 1.125rem;
            color: var(--body-copy);
        }

        /* Sidebar Navigation */
        .sidebar {
            position: sticky;
            top: 140px;
            height: fit-content;
        }

        .sidebar h4 {
            font-family: var(--font-mono);
            font-size: 0.7rem;
            font-weight: 500;
            text-transform: uppercase;
            letter-spacing: 0.15em;
            margin-bottom: 2rem;
            color: var(--color-meta);
        }

        .sidebar ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .sidebar li { margin-bottom: 12px; }

        .sidebar a {
            color: var(--color-meta);
            text-decoration: none;
            font-size: 0.9rem;
            font-weight: 500;
            transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
            display: block;
            border-left: 1.5px solid transparent;
            padding-left: 18px;
        }

        .sidebar a:hover {
            color: var(--color-ink);
            border-left-color: var(--color-accent);
            transform: translateX(4px);
        }

        .sidebar a.active {
            color: var(--color-ink);
            border-left-color: var(--color-ink);
            font-weight: 700;
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .main-grid {
                grid-template-columns: 1fr;
                gap: 40px;
                padding: 60px 24px;
            }
            .sidebar { display: none; }
            .hero h1 { font-size: 3.5rem; }
            .header-actions {
                gap: 0.5rem;
            }
        }

        @media (max-width: 720px) {
            .site-header {
                padding: 1rem;
                gap: 0.75rem;
                flex-wrap: nowrap;
            }

            .header-actions {
                width: auto;
                justify-content: flex-end;
                flex-wrap: nowrap;
                gap: 0.55rem;
            }

            .theme-toggle {
                display: none;
            }

            .theme-cycle-button {
                display: inline-flex;
                min-width: 2.1rem;
                width: 2.1rem;
                padding: 0;
            }

            .theme-cycle-label {
                display: none;
            }

            .pill-button {
                padding: 0.58rem 1rem;
                font-size: 0.76rem;
                white-space: nowrap;
            }

            .logo img {
                height: 1.55rem;
            }
        }

        @media (max-width: 420px) {
            .site-header {
                padding: 0.85rem 0.9rem;
            }

            .header-actions {
                gap: 0.45rem;
            }

            .pill-button {
                padding: 0.52rem 0.82rem;
                font-size: 0.72rem;
                letter-spacing: -0.01em;
            }

            .logo img {
                height: 1.42rem;
            }
        }

        /* Scrollbar */
        ::-webkit-scrollbar { width: 6px; }
        ::-webkit-scrollbar-track { background: var(--color-canvas); }
        ::-webkit-scrollbar-thumb { background: var(--color-divider); border-radius: 10px; }

        /* Contact card */
        .contact-card {
            background: var(--color-surface);
            border: 1px solid var(--color-divider);
            padding: 2rem;
            border-radius: 16px;
            margin-top: 2rem;
        }