:root{--bg: #ffffff;--bg-elev: #f5f7fb;--bg-card: #ffffff;--bg-tint: #eaf4fd;--ink: #0f1726;--ink-dim: #4a5363;--ink-mute: #8b94a3;--primary: #41a4f2;--primary-hover: #2e91e0;--primary-soft: #d6ecfc;--line: #e3e8ef;--line-soft: #eef1f6;--shadow-sm: 0 1px 2px rgba(15, 23, 38, .04);--shadow-md: 0 6px 20px rgba(15, 23, 38, .06);--shadow-lg: 0 18px 40px rgba(65, 164, 242, .18);--radius-sm: 6px;--radius-md: 10px;--radius-lg: 16px;--font-body: "IBM Plex Sans KR", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;color-scheme:light}html[data-theme=dark]{--bg: #0d1320;--bg-elev: #121a28;--bg-card: #151e2d;--bg-tint: #172a3c;--ink: #f2f6fb;--ink-dim: #bdc8d6;--ink-mute: #8492a5;--primary: #58b3f7;--primary-hover: #7bc4fa;--primary-soft: #173650;--line: #2a3545;--line-soft: #202b3a;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .24);--shadow-md: 0 8px 24px rgba(0, 0, 0, .28);--shadow-lg: 0 20px 48px rgba(0, 0, 0, .38);color-scheme:dark}*{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{background:var(--bg);color:var(--ink);font-family:var(--font-body);font-weight:400;line-height:1.65;-webkit-font-smoothing:antialiased;overflow-x:hidden}a{color:inherit;text-decoration:none;transition:color .18s ease}::selection{background:var(--primary-soft);color:var(--ink)}.site-header{position:sticky;top:0;z-index:50;display:flex;justify-content:space-between;align-items:center;padding:1rem 2rem;background:color-mix(in srgb,var(--bg) 86%,transparent);backdrop-filter:saturate(180%) blur(14px);border-bottom:1px solid var(--line)}.logo{display:inline-flex;align-items:center;gap:.6rem;font-weight:700}.logo-svg{display:block;height:38px;width:auto}html[data-theme=dark] .logo-svg tspan:last-child{fill:#aeb7ff}.site-header nav{display:flex;gap:1.75rem}.header-actions{display:flex;align-items:center;gap:1.15rem}.theme-toggle{width:38px;height:38px;display:grid;place-items:center;border:1px solid var(--line);border-radius:50%;background:var(--bg-card);color:var(--ink-dim);cursor:pointer;transition:color .18s ease,border-color .18s ease,background .18s ease,transform .18s ease}.theme-toggle:hover{color:var(--primary);border-color:var(--primary);transform:translateY(-1px)}.theme-toggle:focus-visible{outline:3px solid var(--primary-soft);outline-offset:2px}.theme-icon{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}.theme-icon-sun,html[data-theme=dark] .theme-icon-moon{display:none}html[data-theme=dark] .theme-icon-sun{display:block}.site-header nav a{font-size:.9rem;font-weight:500;color:var(--ink-dim)}.site-header nav a:hover{color:var(--primary)}.nav-toggle,.nav-burger{display:none}@media(max-width:640px){.site-header{padding:.7rem 1rem;position:relative}.site-header .logo-svg{height:32px}.site-header .nav-burger{display:flex;align-items:center;justify-content:center;color:var(--ink);cursor:pointer}.site-header nav{display:none;position:absolute;top:100%;left:0;right:0;flex-direction:column;gap:0;background:var(--bg-card);border-bottom:1px solid var(--line);box-shadow:0 14px 26px -14px #0000002e}.nav-toggle:checked~.header-actions nav{display:flex}.site-header nav a{padding:.95rem 1.2rem;font-size:.95rem;border-top:1px solid var(--line)}}.site-footer{margin-top:0;padding:4rem 2rem 2rem;background:var(--bg-elev);border-top:1px solid var(--line)}.footer-grid{max-width:1180px;margin:0 auto;display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:2.5rem;padding-bottom:2.5rem;border-bottom:1px solid var(--line)}.footer-logo{display:inline-flex;align-items:center;gap:.6rem;margin-bottom:.75rem}.footer-tag{color:var(--ink-mute);font-size:.88rem}.footer-col h4{font-size:.78rem;font-weight:600;letter-spacing:.05em;color:var(--primary);margin-bottom:1rem}.footer-col a{display:block;font-size:.92rem;color:var(--ink-dim);margin-bottom:.5rem;overflow-wrap:anywhere}.footer-col a:hover{color:var(--primary)}.footer-bottom{max-width:1180px;margin:0 auto;padding-top:1.5rem;display:flex;justify-content:space-between;font-family:var(--font-mono);font-size:.72rem;color:var(--ink-mute)}@media(max-width:768px){.site-footer{padding:2.2rem 1.3rem 1.6rem}.footer-grid{grid-template-columns:1fr 1fr;gap:1.5rem;padding-bottom:1.6rem}.footer-brand{grid-column:1 / -1;margin-bottom:.1rem}.footer-col:last-child{grid-column:1 / -1}}@media(max-width:380px){.footer-grid{grid-template-columns:1fr}}