*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--bg: #f5f5f7;--bg-elevated: #ffffff;--card: rgba(255,255,255,.72);--card-solid: #ffffff;--card-hover: rgba(255,255,255,.92);--border: rgba(0,0,0,.08);--border-solid: #e5e5ea;--text: #1d1d1f;--text-secondary: #6e6e73;--text-tertiary: #86868b;--accent: #B94040;--accent-light: #d4645a;--accent-soft: rgba(185,64,64,.1);--accent-gradient: linear-gradient(135deg, #B94040, #d4645a);--shadow-sm: 0 1px 3px rgba(0,0,0,.04);--shadow-md: 0 4px 20px rgba(0,0,0,.06);--shadow-lg: 0 20px 60px rgba(0,0,0,.08);--radius-sm: 12px;--radius-md: 16px;--radius-lg: 24px;--blur: blur(20px) saturate(180%);--ease: cubic-bezier(.25, .1, .25, 1);--ease-out: cubic-bezier(.16, 1, .3, 1);--nav-h: 52px;--max: 1080px}@media (prefers-color-scheme: dark){:root:not([data-theme=light]){--bg: #000000;--bg-elevated: #1c1c1e;--card: rgba(28,28,30,.72);--card-solid: #1c1c1e;--card-hover: rgba(44,44,46,.88);--border: rgba(255,255,255,.08);--border-solid: #38383a;--text: #f5f5f7;--text-secondary: #a1a1a6;--text-tertiary: #6e6e73;--shadow-sm: 0 1px 3px rgba(0,0,0,.2);--shadow-md: 0 4px 20px rgba(0,0,0,.3);--shadow-lg: 0 20px 60px rgba(0,0,0,.4)}}[data-theme=dark]{--bg: #000000;--bg-elevated: #1c1c1e;--card: rgba(28,28,30,.72);--card-solid: #1c1c1e;--card-hover: rgba(44,44,46,.88);--border: rgba(255,255,255,.08);--border-solid: #38383a;--text: #f5f5f7;--text-secondary: #a1a1a6;--text-tertiary: #6e6e73;--shadow-sm: 0 1px 3px rgba(0,0,0,.2);--shadow-md: 0 4px 20px rgba(0,0,0,.3);--shadow-lg: 0 20px 60px rgba(0,0,0,.4)}[data-theme=light]{--bg: #f5f5f7;--bg-elevated: #ffffff;--card: rgba(255,255,255,.72);--card-solid: #ffffff;--card-hover: rgba(255,255,255,.92);--border: rgba(0,0,0,.08);--border-solid: #e5e5ea;--text: #1d1d1f;--text-secondary: #6e6e73;--text-tertiary: #86868b;--shadow-sm: 0 1px 3px rgba(0,0,0,.04);--shadow-md: 0 4px 20px rgba(0,0,0,.06);--shadow-lg: 0 20px 60px rgba(0,0,0,.08)}html{scroll-behavior:smooth}body{font-family:Pretendard Variable,-apple-system,BlinkMacSystemFont,system-ui,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}a{color:inherit;text-decoration:none}button{cursor:pointer;border:none;background:none;font:inherit;color:inherit}input,select{font:inherit}.container{max-width:var(--max);margin:0 auto;padding:0 20px}.nav{position:sticky;top:0;z-index:100;height:var(--nav-h);display:flex;align-items:center;justify-content:space-between;padding:0 20px;background:var(--card);backdrop-filter:var(--blur);-webkit-backdrop-filter:var(--blur);border-bottom:1px solid var(--border)}.nav-brand{font-weight:700;font-size:1rem;color:var(--accent)}.nav-links{display:flex;gap:4px}.nav-links a{padding:6px 12px;border-radius:8px;font-size:.82rem;font-weight:500;color:var(--text-secondary);transition:all .15s var(--ease)}.nav-links a:hover{background:var(--accent-soft);color:var(--accent)}.nav-links a.active{background:var(--accent-soft);color:var(--accent);font-weight:600}.card{background:var(--card-solid);border:1px solid var(--border-solid);border-radius:var(--radius-md);padding:20px;transition:all .2s var(--ease);box-shadow:var(--shadow-sm)}.card:hover{transform:translateY(-2px);box-shadow:var(--shadow-md);border-color:var(--accent)}.article-card{display:block;padding:16px 20px;border-radius:var(--radius-sm);background:var(--card-solid);border:1px solid var(--border-solid);transition:all .15s var(--ease)}.article-card:hover{border-color:var(--accent);background:var(--card-hover)}.article-card .title{font-weight:600;font-size:.95rem;color:var(--text);line-height:1.4}.article-card .meta{font-size:.78rem;color:var(--text-tertiary);margin-top:4px}.tag{display:inline-flex;align-items:center;padding:3px 10px;border-radius:6px;font-size:.72rem;font-weight:600;background:var(--accent-soft);color:var(--accent)}.search-input{width:100%;padding:12px 16px;border:1.5px solid var(--border-solid);border-radius:var(--radius-sm);background:var(--bg-elevated);font-size:.95rem;transition:border-color .15s}.search-input:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}.btn{display:inline-flex;align-items:center;gap:6px;padding:10px 20px;border-radius:10px;font-size:.88rem;font-weight:600;transition:all .15s var(--ease)}.btn-primary{background:var(--accent);color:#fff}.btn-primary:hover{background:var(--accent-light);transform:scale(1.02)}.btn-ghost{background:var(--accent-soft);color:var(--accent)}.btn-ghost:hover{background:#b9404026}.section-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px}.section-title{font-size:1.3rem;font-weight:700;color:var(--text)}.grid-2{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:12px}.grid-3{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:12px}.grid-4{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:10px}.calc-container{max-width:680px;margin:0 auto}.calc-card{background:var(--card-solid);border:1px solid var(--border-solid);border-radius:var(--radius-md);padding:24px;box-shadow:var(--shadow-sm)}.calc-input-group{margin-bottom:16px}.calc-input-group label{display:block;font-size:.82rem;font-weight:600;color:var(--text-secondary);margin-bottom:6px}.calc-input{width:100%;padding:10px 14px;border:1.5px solid var(--border-solid);border-radius:10px;font-size:1rem;background:var(--bg);transition:border-color .15s}.calc-input:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}.calc-result{background:var(--accent-soft);border:1px solid rgba(185,64,64,.2);border-radius:var(--radius-sm);padding:20px;margin-top:16px;text-align:center}.calc-result-value{font-size:2rem;font-weight:800;color:var(--accent)}.calc-result-label{font-size:.8rem;color:var(--text-secondary);margin-top:4px}.article-content h2{font-size:1.4rem;font-weight:700;margin:2rem 0 .8rem;color:var(--text);padding-bottom:8px;border-bottom:1px solid var(--border-solid)}.article-content h3{font-size:1.1rem;font-weight:600;margin:1.5rem 0 .5rem;color:var(--text)}.article-content p{margin:.6rem 0;line-height:1.8}.article-content table{width:100%;border-collapse:collapse;margin:1rem 0;font-size:.85rem}.article-content th,.article-content td{padding:8px 12px;text-align:left;border-bottom:1px solid var(--border-solid)}.article-content th{font-weight:600;color:var(--text-secondary)}@media (max-width: 768px){.nav-links a{padding:6px 8px;font-size:.75rem}.grid-2,.grid-3,.grid-4{grid-template-columns:1fr}.section-title{font-size:1.1rem}}