:root{font-family:Pretendard,SUIT,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;line-height:1.6;font-weight:400;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;color-scheme:light}body{margin:0;min-height:100vh}button{font-family:inherit}:root{--background-color: #f4f7f9;--surface-color: #ffffff;--text-color: #1f2933;--muted-text-color: #4b5563;--border-color: #e5e7eb;--accent-color: #2563eb;--accent-muted: #dbeafe;--card-shadow: 0 15px 35px rgba(15, 23, 42, .12)}body.dark{--background-color: #0f172a;--surface-color: #111827;--text-color: #e5e7eb;--muted-text-color: #9ca3af;--border-color: #1f2937;--accent-color: #60a5fa;--accent-muted: rgba(96, 165, 250, .12);--card-shadow: 0 20px 45px rgba(0, 0, 0, .45)}*{box-sizing:border-box}body{margin:0;font-family:Pretendard,SUIT,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background-color:var(--background-color);color:var(--text-color);line-height:1.7;min-height:100vh;transition:background-color 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a{color:var(--accent-color);font-weight:600}.project-card__detail-cta{display:inline-flex;align-items:center;align-self:flex-start;margin-top:18px;padding:10px 16px;border-radius:999px;font-weight:600;font-size:.92rem;color:var(--accent-color);background:var(--accent-muted);transition:transform .2s ease,background-color .2s ease}.project-card__detail-cta:hover,.project-card__detail-cta:focus-visible{text-decoration:none;transform:translate(4px);background:color-mix(in srgb,var(--accent-color) 22%,transparent)}.skills-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px}.skills-grid__card{background:var(--surface-color);border:1px solid var(--border-color);border-radius:16px;padding:20px}.skills-grid__card 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70%)}.theme-toggle-button:hover:before{opacity:1;transform:scale(1.08)}@media (max-width: 1024px){.anchor-nav{padding:0 16px}.portfolio-container{padding:110px 20px 64px}.section{scroll-margin-top:120px}}@media (max-width: 640px){.anchor-nav{flex-direction:column;height:auto;padding:12px 16px;gap:8px}.anchor-nav__list{flex-wrap:wrap;justify-content:center}.project-card__meta{max-width:none}.contact-list li{flex-direction:column}.hero__photo{max-width:180px}}@media (min-width: 960px){.project-card{flex-direction:row;align-items:stretch}}@media (min-width: 640px){.hero{flex-direction:row;align-items:stretch}.hero__media{justify-content:flex-start;max-width:230px}.hero__content{flex:1}}.portfolio-container--detail{max-width:880px;padding-top:96px}.detail{scroll-margin-top:96px}.detail__back{border:1px solid var(--border-color);background:var(--surface-color);color:var(--text-color);padding:8px 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0}.metric{background:var(--surface-color);border:1px solid var(--border-color);border-radius:16px;padding:18px}.metric__value{font-size:1.5rem;font-weight:700;color:var(--accent-color);margin:0 0 4px}.metric__label{font-size:.92rem;font-weight:600;margin:0}.metric__note{font-size:.82rem;color:var(--muted-text-color);margin:4px 0 0}.detail__block{margin-top:40px}.detail__block-title{font-size:1.3rem;margin:0 0 16px;padding-left:12px;border-left:3px solid var(--accent-color)}.detail__paragraph{color:var(--text-color);margin:0 0 12px}.detail__list{margin:0;padding-left:20px;display:flex;flex-direction:column;gap:8px}.detail__list--outcome li::marker{color:var(--accent-color)}.arch-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:12px;margin-top:16px}.arch-node{background:var(--surface-color);border:1px solid var(--border-color);border-radius:14px;padding:16px}.arch-node__label{font-weight:700;margin:0 0 6px;color:var(--accent-color);font-size:.95rem}.arch-node__value{margin:0;font-size:.9rem;color:var(--muted-text-color)}.challenge-list{display:flex;flex-direction:column;gap:20px}.challenge{display:flex;gap:18px;background:var(--surface-color);border:1px solid var(--border-color);border-radius:18px;padding:22px;box-shadow:var(--card-shadow)}.challenge__index{font-size:1.6rem;font-weight:800;color:color-mix(in srgb,var(--accent-color) 55%,transparent);line-height:1;flex:0 0 auto}.challenge__body{flex:1;min-width:0}.challenge__title{margin:0 0 14px;font-size:1.12rem}.challenge__row{display:grid;grid-template-columns:52px 1fr;gap:12px;align-items:start;padding:8px 0}.challenge__row+.challenge__row{border-top:1px dashed var(--border-color)}.challenge__row p{margin:0;color:var(--text-color)}.challenge__tag{display:inline-flex;align-items:center;justify-content:center;height:24px;border-radius:6px;font-size:.78rem;font-weight:700}.challenge__tag--problem{background:color-mix(in srgb,#ef4444 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