:root{--paper:#f7f5ef;--surface:#fffefa;--ink:#24362e;--muted:#58675e;--green:#183e32;--line:#d8ded5;--soft:#edf1e9;--focus:#92631d;--radius:8px;color-scheme:light}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font-family:'Malgun Gothic','Apple SD Gothic Neo','Noto Sans CJK KR',sans-serif;font-size:17px;line-height:1.8;word-break:keep-all;overflow-wrap:anywhere}[hidden]{display:none!important}a{color:var(--green);text-underline-offset:.25em}a:hover{text-decoration-thickness:2px}a:focus-visible,button:focus-visible,input:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid var(--focus);outline-offset:4px}button,input,textarea{font:inherit}button{cursor:pointer}h1,h2,h3,p{margin-top:0}h1{font-size:clamp(2.1rem,3.2vw,3.2rem);line-height:1.25;letter-spacing:-.05em;margin-bottom:22px}h2{font-size:1.65rem;line-height:1.45;letter-spacing:-.035em;margin-bottom:12px}h3{font-size:1.1rem;line-height:1.55;margin-bottom:12px}p{margin-bottom:15px}li+li{margin-top:8px}ol,ul{padding-left:1.4em}.page-layout{display:grid;grid-template-columns:265px minmax(0,1fr);gap:66px;max-width:1270px;margin:0 auto;padding:48px 34px 70px}main{min-width:0}.course-sidebar{position:sticky;top:24px;max-height:calc(100vh - 48px);display:flex;flex-direction:column;align-self:start;min-width:0}.site-mark{display:block;text-decoration:none;flex-shrink:0;color:var(--green)}.mark-line{display:block;font-size:12px;letter-spacing:.08em;margin-bottom:5px}.site-mark strong{font-size:23px;letter-spacing:-.05em}.sidebar-intro{font-size:14px;color:var(--muted);margin:18px 0 20px}.sidebar-note{flex-shrink:0;font-size:12px;color:var(--muted);padding-top:15px;margin:10px 0 0;border-top:1px solid var(--line)}#chapter-menu{min-height:0;overflow:auto;overscroll-behavior:contain;scrollbar-gutter:stable}#chapter-menu>summary{display:none}#course-nav{list-style:none;margin:0;padding:0;display:grid;gap:4px}#course-nav li+li{margin-top:0}.chapter-nav-link{display:flex;gap:12px;min-height:48px;align-items:center;padding:9px 10px;text-decoration:none;border-radius:5px;font-size:13px;line-height:1.6;color:var(--ink)}.chapter-nav-link:hover,.chapter-nav-link:focus-visible{background:var(--soft)}.nav-number{flex:0 0 21px;font-size:11px;color:var(--muted);font-variant-numeric:tabular-nums}.course-header{padding:12px 0 28px;border-bottom:2px solid var(--green)}.eyebrow{font-size:12px;font-weight:700;color:var(--green);letter-spacing:.045em;margin-bottom:12px}.subtitle{max-width:43em;color:var(--muted);font-size:18px;line-height:1.7}.lecturer{font-size:14px;color:var(--muted);margin:18px 0 0}.privacy-note{background:var(--soft);border-radius:var(--radius);padding:24px 26px;margin:28px 0}.privacy-note h2{font-size:17px}.privacy-note p{font-size:14px;line-height:1.8}.privacy-note p:last-child{margin:0}#prompt-search{padding:22px 0 34px}#prompt-search h2{font-size:19px}.muted,#search-status,.source-reference{font-size:13px;color:var(--muted)}.search-controls{display:flex;gap:10px}.search-controls input{min-width:0;flex:1;padding:10px 14px;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);min-height:48px;font-size:16px}#search-status{margin:12px 0 0}.chapter{border-top:1px solid var(--line);padding:40px 0 50px;scroll-margin-top:30px;min-width:0}.chapter-summary{font-size:18px;font-weight:500;line-height:1.8;margin:22px 0}.lesson-block{margin:24px 0}.lesson-block li{font-size:16px}.lesson-block:last-child{margin-bottom:0}.source-reference{font-variant-numeric:tabular-nums}.concepts{display:grid;grid-template-columns:minmax(100px,1fr) 3fr;gap:14px 18px;margin:30px 0;padding:22px 0;border-block:1px solid var(--line);font-size:15px}.concepts dt{font-weight:700}.concepts dd{margin:0;color:var(--muted)}.chapter-tools{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px 26px;margin-top:30px}.chapter-tools>h3{grid-column:1/-1}.tool-card{padding:8px 0 15px;border-bottom:1px solid var(--line);min-width:0}.resource-link{display:inline-flex;align-items:center;min-height:44px;font-size:16px;font-weight:700;max-width:100%;line-height:1.6}.tool-card p{font-size:14px;margin:5px 0;line-height:1.7}.tool-card .muted{font-size:12px}.badge{display:inline-block;font-size:11px;margin-left:8px;padding:1px 6px;border:1px solid var(--line);border-radius:3px;color:var(--muted);vertical-align:middle}.prompt-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:26px;margin:32px 0 0;min-width:0}.prompt-card h3{font-size:21px;letter-spacing:-.025em}.prompt-instruction{font-size:14px;color:var(--muted);line-height:1.8}.editor-label{display:block;font-size:12px;font-weight:700;margin:20px 0 8px}.prompt-editor{display:block;width:100%;height:380px;max-width:100%;resize:vertical;border:1px solid var(--line);border-radius:5px;padding:18px;background:#fafbf7;color:var(--ink);font-family:Consolas,'Malgun Gothic','Apple SD Gothic Neo',monospace;font-size:14px;line-height:1.85;white-space:pre-wrap;overflow-wrap:anywhere;word-break:break-word;tab-size:2}.prompt-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}.button{min-height:46px;border-radius:5px;border:1px solid var(--line);padding:10px 16px;line-height:1.55;font-size:14px;font-weight:600;background:var(--surface);color:var(--ink)}.button.primary{background:var(--green);border-color:var(--green);color:white}.button.primary:hover{background:#2a5343}.button.secondary:hover{background:var(--soft)}.button:disabled{cursor:wait;opacity:.6}.prompt-status{font-size:13px;margin:12px 0 0;color:var(--green);min-height:0}.prompt-status:empty{display:none}#closing,#downloads{border-top:1px solid var(--line);padding:38px 0}.download-row{padding:12px 0;border-bottom:1px solid var(--line)}.download-row p{margin:5px 0 8px}blockquote{font-weight:700;font-size:23px;color:var(--green);line-height:1.7;margin:30px 0}.closing-action{font-size:17px;font-weight:600}#load-error{padding:24px;background:#fff4e8;border:1px solid #d6bc94;border-radius:var(--radius);margin:24px 0}#load-error h2{font-size:20px}.site-footer{border-top:1px solid var(--line);margin-top:20px;padding-top:22px;font-size:12px;color:var(--muted)}.site-footer a{min-height:44px;display:inline-flex;align-items:center}.skip-link{position:fixed;z-index:20;left:16px;top:-100px;padding:12px;background:var(--green);color:white}.skip-link:focus{top:10px}.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
@media(max-width:899px){.page-layout{display:block;padding:0 22px 48px}.course-sidebar{position:sticky;top:0;z-index:5;background:var(--paper);max-height:calc(100dvh - 20px);padding:12px 0;border-bottom:1px solid var(--line);margin-bottom:26px}.site-mark strong{font-size:18px}.mark-line,.sidebar-intro,.sidebar-note{display:none}#chapter-menu{margin-top:4px}#chapter-menu>summary{display:flex;align-items:center;min-height:44px;font-size:14px;cursor:pointer;font-weight:700}#chapter-menu>summary::after{content:' +';margin-left:auto;font-size:19px}#chapter-menu[open]>summary::after{content:' −'}#chapter-menu nav{max-height:45dvh;overflow:auto}nav>.eyebrow{display:none}.chapter-nav-link{font-size:14px}.course-header{padding:8px 0 28px}h1{font-size:2.2rem}h2{font-size:1.5rem}.subtitle{font-size:17px}.chapter{scroll-margin-top:122px;padding:30px 0 38px}.chapter-summary{font-size:17px}.privacy-note{padding:20px}.chapter-tools{grid-template-columns:1fr;gap:6px}.prompt-card{padding:20px}.prompt-card h3{font-size:19px}.prompt-editor{height:300px;font-size:14px;padding:14px}.concepts{grid-template-columns:1fr;gap:6px}.concepts dd{margin-bottom:14px}.search-controls{flex-wrap:wrap}.search-controls input{flex-basis:180px}.prompt-actions .primary{width:100%}.prompt-actions .secondary{flex:1;white-space:normal}.prompt-actions{gap:8px}.button{font-size:14px;padding:10px 12px}blockquote{font-size:20px}.resource-link{font-size:16px}#prompt-search{padding-bottom:26px}}
@media(max-width:359px){.page-layout{padding-inline:16px}h1{font-size:1.9rem}.prompt-card{padding:15px}.privacy-note{padding:16px}.search-controls input{flex-basis:100%}.search-controls .button{width:100%}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
@media print{.course-sidebar,.prompt-actions,.privacy-note,#prompt-search,.site-footer{display:none}.page-layout{display:block;padding:0}.chapter{break-inside:avoid}body{background:white;font-size:12pt}.prompt-editor{font-size:12pt}a{color:inherit}}