:root{--fg:#15171c;--muted:#656b78;--line:#e4e6eb;--bg:#fff;--blue:#2456e8;--wash:#f5f7fc;--pass:#176638;--pass-bg:#edf8f1;--fail:#9a3412;--fail-bg:#fdeee6;--system:#4b4f8a;--system-bg:#eceefb;--warn-bg:#fff8e1}*{box-sizing:border-box}body{min-height:100vh;color:var(--fg);background:var(--bg);margin:0;font-family:-apple-system,BlinkMacSystemFont,Apple SD Gothic Neo,Noto Sans KR,sans-serif;line-height:1.7}.wrap{max-width:900px;margin:0 auto;padding:2.25rem 1.5rem 5rem}.home-shell{max-width:1120px;margin:0 auto;padding:6.5rem 1.5rem 5.5rem}.wide{max-width:1200px}header.site{border-bottom:0;flex-wrap:wrap;align-items:center;gap:1rem;max-width:1120px;margin:0 auto;padding:1.25rem 1.5rem;display:flex}header.site a{color:inherit;font-weight:750;text-decoration:none}header.site>a{letter-spacing:-.04em}header.site>a:first-letter{color:var(--blue)}header.site nav{align-items:center;gap:1.1rem;margin-left:auto;font-size:.9rem;font-weight:400;display:flex}header.site nav a{color:var(--muted)}header.site nav a:hover{color:var(--blue)}h1{font-size:1.6rem;line-height:1.35}h2{margin-top:2.2rem;font-size:1.25rem}h3{font-size:1.05rem}a{color:var(--blue);text-decoration:none}a:hover{color:#173db0}code{background:#f3f4f7;border-radius:4px;padding:.1em .35em;font-size:.9em}pre{color:#e8eaf0;background:#14161b;border-radius:6px;padding:.9rem 1rem;overflow-x:auto}pre code{color:inherit;background:0 0;padding:0;font-size:.85rem}table{border-collapse:collapse;width:100%;margin:1rem 0}th,td{border:1px solid var(--line);text-align:left;vertical-align:top;padding:.45rem .6rem;font-size:.92rem}th{background:#f7f8fa}blockquote{border-left:4px solid var(--line);background:#f7f8fa;margin:1.2rem 0;padding:.6rem 1rem}.volatile{border:1px dashed var(--line);background:#fcfcfd;border-radius:6px;margin:1.5rem 0;padding:.25rem 1rem 1rem}.volatile-stamp{color:var(--muted);margin:.75rem 0 0;font-size:.78rem}.badge{white-space:nowrap;border:1px solid #0000;border-radius:999px;padding:.1rem .5rem;font-size:.78rem;font-weight:600;display:inline-block}.badge.pass{color:var(--pass);background:var(--pass-bg);border-color:#b9e0c9}.badge.fail{color:var(--fail);background:var(--fail-bg);border-color:#f3c9b3}.badge.system{color:var(--system);background:var(--system-bg);border-color:#c6cbf0}.badge.none{color:var(--muted);border-color:var(--line);background:#f2f3f5}.notice{border:1px solid var(--line);background:#f7f8fa;border-radius:6px;margin:1.25rem 0;padding:.85rem 1rem}.notice.warn{background:var(--warn-bg);border-color:#f0dfa8}.notice.security{background:var(--fail-bg);border-color:#f3c9b3}.notice h3{margin:0 0 .35rem;font-size:.98rem}.notice p{white-space:pre-wrap;margin:.35rem 0 0;font-size:.92rem}.card{border:1px solid var(--line);border-radius:6px;margin:1rem 0;padding:1rem}.muted{color:var(--muted);font-size:.88rem}label{margin:1rem 0 .35rem;font-size:.94rem;font-weight:600;display:block}input[type=file],input[type=text],textarea,select{border:1px solid var(--line);width:100%;font:inherit;border-radius:4px;padding:.5rem;font-size:.92rem}textarea{min-height:5rem}button{font:inherit;border:1px solid var(--fg);background:var(--fg);color:#fff;cursor:pointer;border-radius:4px;padding:.5rem 1rem;font-weight:600}button.secondary{color:var(--fg);background:#fff}ul.lessons{padding:0;list-style:none}ul.lessons li{border:1px solid var(--line);border-radius:6px;margin-bottom:.6rem;padding:.85rem 1rem}ul.artifact-list{margin:.45rem 0 1rem;padding-left:1.2rem}ul.artifact-list li{overflow-wrap:anywhere;margin:.2rem 0}table.matrix td,table.matrix th{text-align:center;font-size:.85rem}table.matrix td:first-child,table.matrix th:first-child{text-align:left}details.draft{margin:.6rem 0}details.draft summary{cursor:pointer;font-size:.9rem;font-weight:600}details.draft pre{color:var(--fg);white-space:pre-wrap;background:#f3f4f7}.lesson img{border:1px solid #d8d8d8;border-radius:6px;max-width:100%;height:auto;margin:1.25rem 0;display:block}.eyebrow,.num{color:var(--blue);letter-spacing:.08em;font-size:.82rem;font-weight:800}.hero{max-width:820px}.hero h1{letter-spacing:-.075em;margin:.75rem 0 1.5rem;font-size:clamp(3rem,8vw,4.9rem);line-height:1.12}.hero h1 em{color:var(--blue);font-style:normal}.hero .lead{max-width:700px;color:var(--muted);font-size:1.18rem}.note{color:#33436a;background:#f4f7ff;border:1px solid #dce5ff;border-radius:12px;margin-top:1.75rem;padding:.95rem 1.1rem;font-size:.9rem}.home-notice{max-width:760px;margin:3rem 0 -4rem}.course-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:1.1rem;margin-top:5.5rem;display:grid}.course-stack{gap:.9rem;display:grid}.course-card{border:1px solid var(--line);min-height:250px;color:inherit;background:#fff;border-radius:16px;flex-direction:column;justify-content:space-between;padding:1.5rem;text-decoration:none;transition:transform .18s,border-color .18s,box-shadow .18s;display:flex}.course-card:hover{border-color:#b7c6ff;transform:translateY(-3px);box-shadow:0 12px 28px #1b398214}.course-card h2{letter-spacing:-.045em;margin:.55rem 0;font-size:1.45rem;line-height:1.35}.course-card h2 a{color:inherit;text-decoration:none}.course-card h2 a:hover{color:var(--blue)}.course-card p{color:var(--muted);margin:0;font-size:.9rem}.assignment-card{min-height:100px;color:inherit;background:#f4f7ff;border:1px solid #cbd8ff;border-radius:16px;flex-direction:column;justify-content:space-between;padding:1rem 1.25rem;text-decoration:none;transition:transform .18s,border-color .18s,box-shadow .18s;display:flex}.assignment-card:hover{border-color:var(--blue);transform:translateY(-2px);box-shadow:0 12px 28px #1b398214}.assignment-card .num{font-size:.72rem}.assignment-card strong{letter-spacing:-.04em;font-size:1.15rem;line-height:1.3}.assignment-card strong span{color:var(--blue)}.course-card-footer{align-items:center;gap:.55rem;margin-top:1.5rem;display:flex}.card-arrow{color:var(--fg);margin-left:auto;font-size:.9rem;font-weight:700;text-decoration:none}.card-arrow:hover{color:var(--blue)}@media (max-width:700px){header.site{padding:1rem 1.1rem}header.site nav{gap:.8rem;width:100%;margin-left:0;overflow-x:auto}.home-shell{padding:4rem 1.1rem 3rem}.hero h1{font-size:clamp(2.65rem,13vw,4rem)}.hero .lead{font-size:1.05rem}.course-grid{grid-template-columns:1fr;margin-top:3.5rem}.course-card{min-height:210px}}
