:root{--bg-color:#0b0f19;--bg-gradient:radial-gradient(circle at 10% 20%, #3b82f640 0%, transparent 50%), radial-gradient(circle at 90% 80%, #8b5cf640 0%, transparent 50%);--text-color:#f8fafc;--text-muted:#94a3b8;--card-bg:#1e293b80;--card-bg-hover:#1e293bcc;--card-border:#ffffff1a;--card-border-hover:#fff3;--header-bg:#0b0f19bf;--primary:#3b82f6;--primary-glow:#3b82f680;--secondary:#8b5cf6;--code-bg:#0f172a;--code-text:#38bdf8;--btn-back-bg:#ffffff1a;--btn-back-hover:#fff3}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-color);background-image:var(--bg-gradient);color:var(--text-color);background-attachment:fixed;flex-direction:column;min-height:100vh;font-family:Inter,Noto Sans KR,sans-serif;display:flex;overflow-x:clip}header{z-index:50;background-color:var(--header-bg);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--card-border);justify-content:space-between;align-items:center;padding:.8rem 2rem;transition:all 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