:root{--bg: #f6f7f9;--surface: #ffffff;--surface-subtle: #f0f2f5;--ink: #111827;--ink-soft: #344054;--muted: #667085;--line: #e3e7ed;--line-strong: #d0d5dd;--brand: #3157e5;--brand-dark: #2442b7;--brand-soft: #eef2ff;--success: #18794e;--success-soft: #eaf7f0;--shadow-sm: 0 1px 2px rgba(16, 24, 40, .04), 0 2px 8px rgba(16, 24, 40, .04);--shadow-lg: 0 24px 60px rgba(23, 34, 79, .14);--radius-sm: 10px;--radius-md: 16px;--radius-lg: 24px;--shell: 1180px}*,*:before,*:after{box-sizing:border-box}html{scroll-behavior:smooth}[id]{scroll-margin-top:96px}body{margin:0;background:var(--bg);color:var(--ink);font-family:Pretendard Variable,Pretendard,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Apple SD Gothic Neo,Malgun Gothic,sans-serif;font-size:16px;line-height:1.7;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;overflow-x:hidden}body:before{position:fixed;z-index:-1;inset:0;content:"";pointer-events:none;background:radial-gradient(circle at 80% 4%,rgba(49,87,229,.08),transparent 28rem)}a{color:inherit}button,input,textarea,select{font:inherit}img,svg{display:block;max-width:100%}::selection{color:var(--ink);background:#ccd7ff}:focus-visible{outline:3px solid rgba(49,87,229,.35);outline-offset:3px}.shell{width:min(var(--shell),calc(100% - 48px));margin-inline:auto}.skip-link{position:fixed;z-index:100;top:12px;left:12px;padding:10px 14px;border-radius:8px;color:#fff;background:var(--ink);font-weight:700;text-decoration:none;transform:translateY(-150%)}.skip-link:focus{transform:translateY(0)}.site-header{position:sticky;z-index:20;top:0;border-bottom:1px solid rgba(227,231,237,.8);background:#f6f7f9db;backdrop-filter:blur(18px) saturate(140%)}.header-inner{position:relative;display:flex;align-items:center;justify-content:space-between;min-height:76px}.brand{display:inline-flex;align-items:center;gap:12px;color:var(--ink);text-decoration:none}.brand-avatar{width:38px;height:38px;flex:none;border:1px solid rgba(49,87,229,.22);border-radius:50%;background:#101214;box-shadow:0 2px 8px #1018281f;object-fit:cover}.brand-copy{display:flex;flex-direction:column;line-height:1.2}.brand-copy strong{font-size:14px;font-weight:850;letter-spacing:.075em}.brand-copy small{margin-top:4px;color:var(--muted);font-size:8px;font-weight:750;letter-spacing:.16em}.nav-panel{display:flex;align-items:center;gap:22px}.nav-panel nav{display:flex;align-items:center;gap:4px}.nav-panel nav a{position:relative;padding:10px 12px;border-radius:9px;color:var(--muted);font-size:14px;font-weight:650;text-decoration:none;transition:color .16s ease,background-color .16s ease}.nav-panel nav a:hover{color:var(--ink);background:#ffffffbf}.nav-panel nav a[aria-current=page]{color:var(--ink)}.nav-panel nav a[aria-current=page]:after{position:absolute;right:12px;bottom:4px;left:12px;height:2px;border-radius:2px;content:"";background:var(--brand)}.header-cta{display:inline-flex;align-items:center;gap:8px;min-height:42px;padding:0 16px;border-radius:11px;color:#fff;background:var(--ink);box-shadow:var(--shadow-sm);font-size:14px;font-weight:750;text-decoration:none;transition:transform .16s ease,background-color .16s ease}.header-cta:hover{background:var(--brand);transform:translateY(-1px)}.header-cta svg{width:18px;fill:none;stroke:currentColor;stroke-linecap:round;stroke-linejoin:round;stroke-width:1.8}.menu-toggle{display:none}main{min-height:68vh}.page-section{padding-block:96px}.page-section+.page-section{padding-top:0}.page-hero{padding:88px 0 64px}.home-hero,.page-hero,.book-hero,.about-hero{border-bottom:1px solid var(--line);background:radial-gradient(circle at 88% -8%,rgba(49,87,229,.07),transparent 26rem),linear-gradient(180deg,#fff,#f1f4fa)}.narrow{width:min(780px,100%)}.eyebrow{display:inline-flex;align-items:center;gap:9px;margin:0 0 18px;color:var(--brand);font-size:12px;font-weight:800;letter-spacing:.12em;line-height:1.4;text-transform:uppercase}.eyebrow:before{width:22px;height:2px;border-radius:2px;content:"";background:currentColor}h1,h2,h3,p{margin-top:0}h1,h2,h3{color:var(--ink);letter-spacing:-.045em;word-break:keep-all}h1{margin-bottom:20px;font-size:clamp(2.5rem,5.2vw,4.6rem);line-height:1.08}h2{margin-bottom:14px;font-size:clamp(1.75rem,3vw,2.5rem);line-height:1.2}h3{margin-bottom:8px;font-size:1.2rem;line-height:1.35}.lead{max-width:720px;margin-bottom:0;color:var(--ink-soft);font-size:clamp(1.05rem,1.7vw,1.25rem);line-height:1.75;letter-spacing:-.018em;word-break:keep-all;overflow-wrap:break-word}.section-head{display:flex;align-items:end;justify-content:space-between;gap:32px;margin-bottom:32px}.section-head p{max-width:520px;margin-bottom:5px;color:var(--muted)}.section-label{display:block;margin-bottom:10px;color:var(--brand);font-size:12px;font-weight:800;letter-spacing:.12em}.button-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:32px}.button{display:inline-flex;align-items:center;justify-content:center;gap:9px;min-height:50px;padding:0 21px;border:1px solid transparent;border-radius:13px;font-size:15px;font-weight:750;text-decoration:none;transition:transform .16s ease,box-shadow .16s ease,border-color .16s ease,background-color .16s ease}.button:hover{transform:translateY(-2px)}.button svg{width:19px;fill:none;stroke:currentColor;stroke-linecap:round;stroke-linejoin:round;stroke-width:1.9}.button.primary{color:#fff;background:var(--brand);box-shadow:0 8px 20px #3157e533}.button.primary:hover{background:var(--brand-dark);box-shadow:0 12px 26px #3157e542}.button.secondary{border-color:var(--line-strong);color:var(--ink);background:#fffc}.button.secondary:hover{border-color:#aeb7c5;background:#fff;box-shadow:var(--shadow-sm)}.button.small{min-height:42px;padding-inline:16px;border-radius:11px;font-size:14px}.status{display:inline-flex;align-items:center;gap:7px;width:fit-content;padding:6px 10px;border-radius:999px;color:var(--success);background:var(--success-soft);font-size:12px;font-weight:800}.status:before{width:6px;height:6px;border-radius:50%;content:"";background:currentColor;box-shadow:0 0 0 3px #18794e1f}.status.pending{color:#9a5b13;background:#fbf1e0}.status.pending:before{box-shadow:0 0 0 3px #9a5b1324}.download-list{display:grid;gap:12px}.download-item{display:grid;grid-template-columns:auto minmax(0,1fr) auto auto;align-items:center;gap:18px;min-height:92px;padding:18px 20px;border:1px solid var(--line);border-radius:var(--radius-md);color:inherit;background:#ffffffe0;box-shadow:0 1px 1px #10182805;text-decoration:none;transition:border-color .17s ease,box-shadow .17s ease,transform .17s ease}.download-item:hover{border-color:#b8c5f5;box-shadow:0 10px 28px #1c2d6814;transform:translateY(-2px)}.file-icon{display:grid;width:46px;height:46px;place-items:center;border-radius:13px;color:var(--brand);background:var(--brand-soft)}.file-icon svg{width:23px;fill:none;stroke:currentColor;stroke-linecap:round;stroke-linejoin:round;stroke-width:1.7}.file-icon .file-ext{font-size:11.5px;font-weight:850;letter-spacing:.03em}.download-copy{min-width:0}.download-copy strong{display:block;color:var(--ink);font-size:15.5px;letter-spacing:-.02em}.download-copy span{display:block;margin-top:3px;color:var(--muted);font-size:13.5px;line-height:1.55;word-break:keep-all;overflow-wrap:break-word}.file-size{color:var(--muted);font-size:12.5px;white-space:nowrap}.download-action{display:inline-flex;align-items:center;gap:7px;color:var(--brand);font-size:13.5px;font-weight:800;white-space:nowrap}.download-action svg{width:17px;fill:none;stroke:currentColor;stroke-linecap:round;stroke-linejoin:round;stroke-width:1.9}.prose{color:var(--ink-soft);font-size:17px;line-height:1.9;letter-spacing:-.015em}.prose>:first-child{margin-top:0}.prose>:last-child{margin-bottom:0}.prose p{margin:0 0 1.15em}.prose ul,.prose ol{margin:1.1em 0;padding-left:1.4em}.prose li{padding-left:.3em;margin:.55em 0}.prose strong{color:var(--ink);font-weight:750}.prose a{color:var(--brand);text-underline-offset:3px}.site-footer{margin-top:40px;border-top:1px solid var(--line);background:#ffffffc2}.footer-grid{display:grid;grid-template-columns:1fr auto;gap:48px;padding-block:52px 36px}.footer-brand{color:var(--ink);font-size:18px;font-weight:800;letter-spacing:-.04em;text-decoration:none}.footer-grid p{max-width:440px;margin:9px 0 0;color:var(--muted);font-size:14px}.footer-links{display:flex;align-items:start;gap:26px}.footer-links a{color:var(--ink-soft);font-size:13.5px;font-weight:650;text-decoration:none}.footer-links a:hover{color:var(--brand)}.footer-bottom{display:flex;justify-content:space-between;gap:24px;padding-block:19px;border-top:1px solid var(--line);color:var(--muted);font-size:12.5px}@media(max-width:900px){.page-section{padding-block:76px}.page-hero{padding-block:68px 52px}.section-head{align-items:start;flex-direction:column;gap:6px}}@media(max-width:760px){.shell{width:min(100% - 36px,var(--shell))}.header-inner{min-height:66px}.brand-avatar{width:38px;height:38px}.brand-copy small{display:none}.menu-toggle{display:grid;width:42px;height:42px;padding:0;place-content:center;gap:5px;border:1px solid var(--line);border-radius:11px;background:#ffffffd1;cursor:pointer}.menu-toggle span{width:18px;height:1.5px;border-radius:2px;background:var(--ink);transition:transform .16s ease,opacity .16s ease}.menu-toggle[aria-expanded=true] span:nth-child(1){transform:translateY(6.5px) rotate(45deg)}.menu-toggle[aria-expanded=true] span:nth-child(2){opacity:0}.menu-toggle[aria-expanded=true] span:nth-child(3){transform:translateY(-6.5px) rotate(-45deg)}.nav-panel{position:absolute;top:calc(100% + 10px);right:0;left:0;display:none;padding:10px;border:1px solid var(--line);border-radius:16px;background:#fffffffa;box-shadow:0 18px 48px #10182824}.nav-panel[data-open]{display:block}.nav-panel nav{align-items:stretch;flex-direction:column}.nav-panel nav a{padding:12px 13px}.nav-panel nav a[aria-current=page]{background:var(--brand-soft);color:var(--brand)}.nav-panel nav a[aria-current=page]:after{display:none}.header-cta{width:100%;margin-top:8px;justify-content:center;background:var(--brand)}.page-section{padding-block:64px}.page-hero{padding-block:56px 40px}h1{font-size:clamp(2.05rem,9.7vw,2.5rem)}h2{font-size:1.75rem}.lead{font-size:1rem}.button-row{align-items:stretch;flex-direction:column}.button-row .button{width:100%}.download-item{grid-template-columns:auto minmax(0,1fr) auto;gap:13px;padding:16px}.file-size{display:none}.download-action{width:34px;height:34px;justify-content:center;border-radius:9px;background:var(--brand-soft);font-size:0}.download-action svg{width:18px}.footer-grid{grid-template-columns:1fr;gap:28px;padding-block:40px 28px}.footer-links{display:grid;grid-template-columns:repeat(2,1fr);gap:12px 24px}.footer-bottom{align-items:start;flex-direction:column;gap:3px}}@media(max-width:420px){.shell{width:min(100% - 28px,var(--shell))}.brand{gap:9px}.brand-copy strong{font-size:13.5px}.download-item{grid-template-columns:auto minmax(0,1fr)}.download-action{display:none}.file-icon{width:42px;height:42px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{scroll-behavior:auto!important;transition-duration:.01ms!important;animation-duration:.01ms!important;animation-iteration-count:1!important}}