:root{--primary:#2563eb;--primary-dark:#1d4ed8;--primary-50:#eff6ff;--accent:#0ea5e9;--success:#16a34a;--danger:#dc2626;--text:#0f172a;--text-soft:#475569;--text-faint:#94a3b8;--bg:#f8fafc;--surface:#fff;--border:#e2e8f0;--radius:12px;--radius-sm:8px;--shadow-sm:0 1px 2px #0f172a0f;--shadow-md:0 8px 24px #0f172a14;--shadow-lg:0 16px 40px #0f172a1f;--container:1120px;--font:-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans KR", "Apple SD Gothic Neo", "Malgun Gothic", "Helvetica Neue", Arial, sans-serif}*,:before,:after{box-sizing:border-box}html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}body{font-family:var(--font);color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased;margin:0;font-size:16px;line-height:1.7}img{max-width:100%;height:auto}a{color:var(--primary);text-decoration:none}a:hover{text-decoration:underline}h1,h2,h3,h4{margin:0 0 .6em;font-weight:700;line-height:1.3}p{margin:0 0 1em}ul,ol{margin:0 0 1em;padding-left:1.4em}.container{width:100%;max-width:var(--container);margin:0 auto;padding:0 20px}.sr-only{clip:rect(0, 0, 0, 0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.site-header{z-index:100;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-bottom:1px solid var(--border);background:#ffffffeb;position:sticky;top:0}.header-inner{justify-content:space-between;align-items:center;gap:16px;min-height:64px;display:flex}.brand{color:var(--text);align-items:center;gap:10px;font-size:1.15rem;font-weight:800;display:inline-flex}.brand:hover{text-decoration:none}.brand__icon{width:30px;height:30px}.brand__name strong{color:var(--primary)}.nav__list{gap:4px;margin:0;padding:0;list-style:none;display:flex}.nav__link{border-radius:var(--radius-sm);color:var(--text-soft);padding:8px 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var(--border);border-radius:var(--radius-sm);background:var(--surface);color:var(--text-soft);cursor:pointer;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%236b7280' stroke-width='2.5' stroke-linecap='round'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");background-position:right 10px center;background-repeat:no-repeat;padding:7px 28px 7px 12px;font-family:inherit;font-size:.85rem;font-weight:600;line-height:1.2;transition:border-color .15s}.lang-select:hover{border-color:var(--primary)}.lang-select:focus-visible{outline:2px solid var(--primary);outline-offset:2px}.nav-toggle{border:1px solid var(--border);border-radius:var(--radius-sm);width:42px;height:42px;color:var(--text);cursor:pointer;background:0 0;font-size:1.4rem;line-height:1;display:none}.mobile-nav{border-top:1px solid var(--border);background:var(--surface);display:none}.mobile-nav.is-open{display:block}.mobile-nav__item>a{border-bottom:1px solid var(--border);color:var(--text-soft);padding:14px 20px;font-weight:600;display:block}.mobile-nav__group{border-bottom:1px solid var(--border)}.mobile-nav__group summary{cursor:pointer;color:var(--text-soft);padding:14px 20px;font-weight:600;list-style:none}.mobile-nav__group summary::-webkit-details-marker{display:none}.mobile-nav__group a{color:var(--text-faint);padding:10px 20px 10px 36px;font-size:.95rem;display:block}@media (width<=920px){.nav{display:none}.nav-toggle{justify-content:center;align-items:center;display:inline-flex}.header-actions .btn{display:none}}.btn{border-radius:var(--radius-sm);cursor:pointer;border:1px solid #0000;justify-content:center;align-items:center;gap:8px;padding:10px 20px;font-family:inherit;font-size:.95rem;font-weight:700;line-height:1.4;transition:background .15s,transform 50ms,box-shadow .15s;display:inline-flex}.btn:active{transform:translateY(1px)}.btn:disabled{opacity:.55;cursor:not-allowed}.btn--primary{background:var(--primary);color:#fff}.btn--primary:hover:not(:disabled){background:var(--primary-dark);box-shadow:0 6px 16px #2563eb4d}.btn--success{background:var(--success);color:#fff}.btn--success:hover:not(:disabled){filter:brightness(1.08)}.btn--ghost{border-color:var(--border);color:var(--text-soft);background:0 0}.btn--ghost:hover:not(:disabled){background:var(--bg)}.btn--danger{border-color:var(--danger);color:var(--danger);background:0 0}.btn--sm{padding:7px 14px;font-size:.85rem}.btn--lg{padding:14px 28px;font-size:1.05rem}.btn--block{width:100%}.btn__icon{flex-shrink:0;width:18px;height:18px}.hero{text-align:center;background:linear-gradient(180deg, var(--primary-50) 0%, var(--bg) 100%);padding:64px 0 48px}.hero__title{letter-spacing:-.02em;max-width:900px;margin:0 auto .4em;font-size:clamp(1.8rem,4.5vw,2.9rem)}.hero__title 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12px;display:flex}.file-item__thumb{object-fit:cover;background:#fff;border-radius:6px;flex-shrink:0;width:44px;height:44px}.file-item__meta{flex:1;min-width:0}.file-item__name{white-space:nowrap;text-overflow:ellipsis;font-size:.92rem;font-weight:600;overflow:hidden}.file-item__size{color:var(--text-faint);font-size:.8rem}.file-item__tools{gap:4px;display:flex}.icon-btn{border-radius:var(--radius-sm);width:32px;height:32px;color:var(--text-soft);cursor:pointer;background:0 0;border:1px solid #0000;justify-content:center;align-items:center;display:inline-flex}.icon-btn:hover{border-color:var(--border);color:var(--primary);background:#fff}.icon-btn--danger:hover{color:var(--danger);border-color:var(--danger)}.icon-btn 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svg{width:16px;height:16px;color:var(--success);flex-shrink:0}.ad-slot{max-width:var(--container);margin:0 auto;padding:32px 20px}.ad-slot__label{text-align:center;letter-spacing:.08em;text-transform:uppercase;color:var(--text-faint);margin-bottom:8px;font-size:.72rem;display:block}.ad-slot__body{border:1px dashed var(--border);border-radius:var(--radius);background:#fff9;justify-content:center;align-items:center;min-height:100px;display:flex}.ad-slot__body.is-filled{background:0 0;border-style:solid}.ad-slot__body .adsbygoogle{display:block}.content-section{padding:32px 0}.content-section h2{margin-top:1.2em;font-size:clamp(1.35rem,3vw,1.7rem)}.content-section h2:first-child{margin-top:0}.content-section h3{margin-top:1.2em;font-size:1.2rem}.content-section p,.content-section li{color:var(--text-soft)}.section-head{text-align:center;margin-bottom:36px}.section-head h2{font-size:clamp(1.4rem,3vw,1.9rem)}.section-head p{color:var(--text-soft);max-width:640px;margin:0 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svg{width:22px;height:22px}.feature-card h3{margin-bottom:.4em;font-size:1.05rem}.feature-card p{color:var(--text-soft);margin:0;font-size:.92rem}.faq{padding:48px 0}.faq__list{flex-direction:column;gap:12px;max-width:780px;margin:0 auto;display:flex}.faq__item{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-sm)}.faq__item summary{cursor:pointer;justify-content:space-between;align-items:center;gap:12px;padding:18px 20px;font-size:1rem;font-weight:700;list-style:none;display:flex}.faq__item summary::-webkit-details-marker{display:none}.faq__item summary:after{content:"+";color:var(--primary);flex-shrink:0;font-size:1.3rem;font-weight:400}.faq__item[open] summary:after{content:"−"}.faq__item>div{color:var(--text-soft);padding:0 20px 18px;font-size:.95rem}.faq__item p{margin:0 0 .8em}.faq__item p:last-child{margin-bottom:0}.related{padding:48px 0 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var(--border);box-shadow:var(--shadow-lg);border-radius:20px;max-width:980px;margin:0 auto;overflow:hidden}.viewer-toolbar{border-bottom:1px solid var(--border);background:var(--bg);flex-wrap:wrap;align-items:center;gap:10px;padding:12px 16px;display:flex}.viewer-toolbar__spacer{flex:1}.viewer-stage{background:#e2e8f0;justify-content:center;align-items:flex-start;min-height:360px;padding:20px;display:flex}.viewer-stage canvas,.viewer-stage img{max-width:100%;box-shadow:var(--shadow-md);background:#fff}.viewer-empty{color:var(--text-faint);text-align:center;align-self:center;padding:60px 20px}.viewer-status{color:var(--text-soft);border-top:1px solid var(--border);background:var(--bg);padding:10px 16px;font-size:.88rem}.viewer-status strong{color:var(--text)}.pw-meter{background:var(--bg);border:1px solid var(--border);border-radius:999px;height:6px;margin-top:8px;overflow:hidden}.pw-meter__bar{background:var(--danger);width:0;height:100%;transition:width .2s,background .2s}.pw-meter__text{color:var(--text-faint);margin-top:4px;font-size:.78rem}.tabs{background:var(--bg);border:1px solid var(--border);border-radius:10px;gap:6px;margin-bottom:18px;padding:4px;display:flex}.tab{color:var(--text-soft);cursor:pointer;background:0 0;border:none;border-radius:8px;flex:1;padding:10px 12px;font-family:inherit;font-size:.92rem;font-weight:700}.tab.is-active{background:var(--surface);color:var(--primary);box-shadow:var(--shadow-sm)}.tab-panel[hidden]{display:none}.thumb-grid{grid-template-columns:repeat(auto-fill,minmax(110px,1fr));gap:10px;max-height:340px;margin-top:14px;padding:4px;display:grid;overflow-y:auto}.thumb{border:2px solid var(--border);cursor:pointer;text-align:center;color:var(--text-soft);background:#fff;border-radius:8px;padding:6px;font-size:.78rem;position:relative}.thumb.is-selected{border-color:var(--primary);background:var(--primary-50)}.thumb canvas{max-width:100%;height:auto;margin:0 auto;display:block}.thumb 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auto}.article__title{letter-spacing:-.02em;font-size:clamp(1.6rem,4vw,2.2rem)}.article__meta{color:var(--text-faint);gap:16px;margin-bottom:24px;font-size:.88rem;display:flex}.article__thumb{border-radius:var(--radius);box-shadow:var(--shadow-md);margin-bottom:24px}.article h2{margin-top:1.6em;font-size:1.45rem}.article h3{margin-top:1.3em;font-size:1.15rem}.article table{border-collapse:collapse;width:100%;margin:1em 0;font-size:.92rem}.article th,.article td{border:1px solid var(--border);text-align:left;padding:10px 12px}.article th{background:var(--bg);font-weight:700}.article blockquote{border-left:4px solid var(--primary);background:var(--primary-50);border-radius:0 var(--radius-sm) var(--radius-sm) 0;color:var(--text-soft);margin:1.2em 0;padding:14px 18px}.page{padding:48px 0 72px}.page__inner{max-width:820px;margin:0 auto}.page__title{margin-bottom:.3em;font-size:clamp(1.6rem,4vw,2.2rem)}.page__updated{color:var(--text-faint);margin-bottom:2em;font-size:.9rem}.page h2{margin-top:1.6em;font-size:1.35rem}.page h3{margin-top:1.2em;font-size:1.1rem}.page p,.page li{color:var(--text-soft)}.contact-box{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-sm);padding:24px}.site-footer{color:#cbd5e1;background:#0f172a;margin-top:24px;padding:56px 0 24px}.footer-grid{border-bottom:1px solid #1e293b;grid-template-columns:2fr 1fr 1fr 1fr;gap:32px;padding-bottom:40px;display:grid}@media (width<=820px){.footer-grid{grid-template-columns:1fr 1fr}}@media (width<=480px){.footer-grid{grid-template-columns:1fr}}.footer-brand{color:#fff;align-items:center;gap:10px;margin-bottom:12px;font-size:1.2rem;font-weight:800;display:inline-flex}.footer-brand strong{color:#60a5fa}.footer-brand:hover{text-decoration:none}.site-footer h3{color:#fff;letter-spacing:.02em;margin-bottom:14px;font-size:.95rem}.site-footer ul{flex-direction:column;gap:8px;margin:0;padding:0;list-style:none;display:flex}.site-footer a{color:#cbd5e1;font-size:.9rem}.site-footer a:hover{color:#fff}.footer-bottom{color:#64748b;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;padding-top:24px;font-size:.85rem;display:flex}.footer-bottom a{color:#94a3b8}.error-page{text-align:center;padding:96px 20px}.error-page h1{color:var(--primary);margin-bottom:.1em;font-size:clamp(3rem,10vw,6rem)}.error-page h2{font-size:clamp(1.2rem,3vw,1.6rem)}.error-page p{color:var(--text-soft);max-width:520px;margin:0 auto 24px}.text-center{text-align:center}.mt-0{margin-top:0}.mb-0{margin-bottom:0}