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    <title>ARCANE | Backend Architect</title>
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    <style>
        /* --- RESET & VARS --- */
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        /* --- UTILITIES --- */
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            padding: 0 1.5rem; /* Reduced padding for mobile */
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        /* --- NAV --- */
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            padding: 0 1.5rem;
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        /* Desktop Menu */
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        /* Mobile Menu Toggle (Hidden on Desktop) */
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            font-size: 1.5rem;
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        /* --- HERO SECTION --- */
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            gap: 4rem;
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        /* --- SECTIONS --- */
        section {
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            font-size: 2rem;
            margin-bottom: 3rem;
            font-weight: 100;
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        /* --- SKILLS GRID --- */
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            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 1.5rem;
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        .skill-card li { margin-bottom: 0.5rem; font-size: 0.9rem; color: var(--text-muted); }
        .skill-card li::before { content: ':: '; color: var(--accent-red); }

        /* --- PROJECTS --- */
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            gap: 3rem;
            margin-bottom: 5rem;
            align-items: center;
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        .project-diagram {
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            border: 1px solid #222;
            height: 250px;
            position: relative;
            display: flex;
            justify-content: center;
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        /* --- FOOTER --- */
        footer {
            padding: 4rem 0 6rem 0; /* Extra bottom padding for mobile browsers */
            text-align: center;
            border-top: 1px solid var(--accent-red);
            margin-top: 2rem;
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        .stamp {
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            border: 2px solid var(--accent-red);
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            color: var(--accent-red);
            display: flex;
            justify-content: center;
            align-items: center;
            margin: 0 auto 1.5rem auto;
            font-family: var(--font-serif);
            font-weight: 900;
        }

        /* --- MOBILE MEDIA QUERIES --- */
        @media (max-width: 768px) {
            
            /* Nav Mobile Overlay */
            .menu-toggle { display: block; }
            
            .nav-links {
                position: fixed;
                top: 0; right: -100%;
                width: 70%;
                height: 100vh;
                background: #111;
                flex-direction: column;
                justify-content: center;
                align-items: center;
                gap: 3rem;
                transition: 0.4s ease;
                border-left: 1px solid var(--accent-red);
            }

            .nav-links.active { right: 0; }
            .nav-links a { font-size: 1.2rem; }

            /* Hero Mobile */
            .hero-content {
                grid-template-columns: 1fr;
                text-align: center;
                gap: 2rem;
            }

            .name-vertical {
                writing-mode: horizontal-tb;
                border-right: none;
                border-bottom: 1px solid var(--accent-red);
                padding-bottom: 1rem;
                padding-right: 0;
                font-size: 3rem;
                width: 100%;
            }

            .hero-text h2 { font-size: 1.8rem; }
            
            /* Projects Mobile */
            .project-item {
                grid-template-columns: 1fr;
                gap: 2rem;
                margin-bottom: 4rem;
            }

            /* Order: Diagram first on mobile? Optional. keeping text first is standard. */
            
            .container { padding: 0 1.2rem; }
        }
    </style>
</head>
<body>

    <div class="grid-bg"></div>

    <nav>
        <div class="logo">ARCANE</div>
        <div class="menu-toggle" onclick="toggleMenu()">☰</div>
        <div class="nav-links" id="navLinks">
            <a href="#about" onclick="toggleMenu()">01. LOGIC</a>
            <a href="#skills" onclick="toggleMenu()">02. SYSTEM</a>
            <a href="#projects" onclick="toggleMenu()">03. ARCHITECTURE</a>
            <a href="#contact" onclick="toggleMenu()">04. CONTACT</a>
        </div>
    </nav>

    <header class="hero container">
        <div class="hero-content">
            <h1 class="name-vertical">アーケイン</h1>
            <div class="hero-text">
                <span class="japanese-label">BACKEND ARCHITECT</span>
                <h2>Logic in the<br>Shadows.</h2>
                <p>Specialized in high-load server environments, distributed database management, and algorithmic efficiency.</p>
                <a href="#contact" class="btn">INITIATE_CONTACT()</a>
            </div>
        </div>
    </header>

    <section id="skills" class="container">
        <span class="japanese-label">ARSENAL</span>
        <h2 class="section-title">Tech Stack</h2>
        <div class="skills-grid">
            <div class="skill-card">
                <h3>Core Languages</h3>
                <ul>
                    <li>Python (FastAPI)</li>
                    <li>Go (Golang)</li>
                    <li>Rust (Systems)</li>
                </ul>
            </div>
            <div class="skill-card">
                <h3>Data & Storage</h3>
                <ul>
                    <li>PostgreSQL (Tuning)</li>
                    <li>Redis Cluster</li>
                    <li>Kafka / RabbitMQ</li>
                </ul>
            </div>
            <div class="skill-card">
                <h3>Infrastructure</h3>
                <ul>
                    <li>Docker & K8s</li>
                    <li>AWS (EC2, Lambda)</li>
                    <li>Terraform</li>
                </ul>
            </div>
        </div>
    </section>

    <section id="projects" class="container">
        <span class="japanese-label">CASE STUDIES</span>
        <h2 class="section-title">Selected Works</h2>

        <div class="project-item">
            <div class="project-info">
                <h3>KITSUNE | Trading Bot</h3>
                <p style="color:var(--text-muted); font-size: 0.95rem; margin-top: 1rem;">
                    A high-frequency trading algorithm handling 500 req/s. 
                    <br><br>
                    <span style="color:var(--accent-red)">> Strategy:</span> Database sharding & in-memory caching reduced latency by 90%.
                </p>
            </div>
            <div class="project-diagram">
                <div style="width: 10px; height: 10px; background: #fff; border-radius: 50%; position: absolute; left: 20%;"></div>
                <div style="width: 60%; height: 1px; background: #333; position: absolute;"></div>
                <div style="width: 10px; height: 10px; background: var(--accent-red); border-radius: 50%; position: absolute; right: 20%;"></div>
                <div style="position:absolute; bottom:10px; right:10px; font-size:0.7rem; color:#555;">FIG 1.0</div>
            </div>
        </div>

        <div class="project-item">
            <div class="project-info">
                <h3>RONIN | Payment Gateway</h3>
                <p style="color:var(--text-muted); font-size: 0.95rem; margin-top: 1rem;">
                    Fault-tolerant microservices architecture.
                    <br><br>
                    <span style="color:var(--accent-red)">> Strategy:</span> Implemented idempotency keys and eventual consistency models.
                </p>
            </div>
            <div class="project-diagram">
                 <div style="border: 1px dashed #444; width: 40%; height: 60%; position: absolute;"></div>
                 <div style="width: 10px; height: 10px; background: var(--accent-red); position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);"></div>
                 <div style="position:absolute; bottom:10px; right:10px; font-size:0.7rem; color:#555;">FIG 1.1</div>
            </div>
        </div>
    </section>

    <footer id="contact">
        <div class="stamp">秘</div>
        <h3>TRANSMISSION LINK</h3>
        <p style="color: var(--text-muted); margin: 1rem 0;">arcane@dev.system</p>
    </footer>

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