:root{--bg:#f7f9fc;--paper:#fff;--ink:#17253f;--muted:#63718a;--blue:#315bc7;--line:#e6ebf2;--soft:#edf3ff;--radius:20px;--shadow:0 8px 28px rgba(31,50,89,.055)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font-family:Pretendard,"Noto Sans KR","Malgun Gothic",system-ui,sans-serif;font-size:16px;line-height:1.55}a{color:inherit;text-decoration:none}button,a,video{touch-action:manipulation}.skip{position:absolute;top:-100px;left:12px;z-index:20;background:var(--ink);color:#fff;padding:10px}.skip:focus{top:12px}:focus-visible{outline:3px solid #f09f37;outline-offset:3px}.shell{display:grid;grid-template-columns:240px minmax(0,1fr);min-height:100vh}.sidebar{padding:32px 20px;background:#fff;border-right:1px solid var(--line);display:flex;flex-direction:column;gap:48px}.brand,.mobile-brand{display:flex;align-items:center;gap:10px;font-weight:800;letter-spacing:-.04em;font-size:19px}.brand small{display:block;font-size:11px;letter-spacing:0;font-weight:500;color:var(--muted)}.brand-mark{display:grid;place-items:center;flex:none;width:35px;height:35px;border-radius:11px;background:var(--blue);color:#fff;font-size:13px;letter-spacing:-.06em}.sidebar nav{display:grid;gap:6px}.sidebar nav a{padding:12px 14px;border-radius:12px;color:var(--muted);font-weight:650;font-size:14px}.sidebar nav a:hover,.sidebar nav a.nav-active{background:var(--soft);color:var(--blue)}.sidebar-note{margin-top:auto;border-radius:14px;background:#f4f7fb;padding:15px;color:#344966;font-size:13px;font-weight:700}.sidebar-note small{color:var(--muted);font-weight:400}.dot{display:inline-block;width:7px;height:7px;border-radius:50%;background:#72a8ed;margin-right:7px}.workspace{min-width:0}.topbar{height:78px;padding:0 clamp(24px,5vw,76px);border-bottom:1px solid var(--line);background:rgba(255,255,255,.8);display:flex;align-items:center;gap:10px}.eyebrow{font-size:13px;font-weight:650;color:var(--muted)}.top-chip{margin-left:auto;border:1px solid #dce6f8;color:#3d62a5;padding:6px 12px;border-radius:999px;font-size:12px;font-weight:750}.mobile-brand{display:none}main{max-width:1460px;margin:auto;padding:36px clamp(24px,5vw,76px) 72px}.hero{min-height:300px;background:linear-gradient(118deg,#eaf2ff 0%,#f2f8ff 65%,#e9f7f4 100%);border:1px solid #e2ebf5;border-radius:26px;padding:44px 54px;display:flex;align-items:center;justify-content:space-between;overflow:hidden;position:relative}.hero>div:first-child{z-index:1;max-width:630px}.kicker{margin:0 0 11px;color:var(--blue);font-size:13px;letter-spacing:.035em;font-weight:800}.hero h1,.detail-heading h1{font-size:clamp(28px,2.7vw,40px);line-height:1.3;letter-spacing:-.055em;margin:0;font-weight:800}.hero-copy{color:#52637e;margin:17px 0 25px;max-width:550px;font-size:15px}.hero-link{display:inline-flex;align-items:center;gap:18px;background:var(--blue);color:#fff;padding:11px 18px;border-radius:11px;font-size:14px;font-weight:750;min-height:44px}.hero-link:hover{background:#244aa9}.hero-art{width:280px;height:210px;position:relative;flex:none;margin-right:20px}.art-window{position:absolute;inset:20px 0 8px 17px;border:7px solid #fff;box-shadow:0 16px 32px #4771a127;border-radius:20px;background:#d4e7f8;transform:rotate(-5deg);padding:15px}.art-bar{display:flex;gap:5px}.art-bar i{height:6px;width:6px;background:#91adc7;border-radius:50%}.art-play{width:64px;height:64px;display:grid;place-items:center;background:#fff;color:var(--blue);border-radius:50%;font-size:23px;box-shadow:0 6px 17px #5378a533;margin:24px auto 10px;padding-left:3px}.art-line{height:8px;width:65%;border-radius:5px;background:#abc6df;margin:14px 0}.art-line.short{width:42%;margin-top:9px}.art-orbit{position:absolute;border-radius:50%;background:#a5c8f5}.orbit-one{width:28px;height:28px;right:-20px;top:0}.orbit-two{width:14px;height:14px;left:0;bottom:-15px;background:#adddd0}.section-head{display:flex;align-items:end;justify-content:space-between;margin:42px 0 18px}.section-head .kicker{margin-bottom:4px}.section-head h2{font-size:24px;letter-spacing:-.045em;margin:0}.count{color:var(--muted);font-size:13px}.card-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.course-card{min-width:0;background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:transform .18s ease,box-shadow .18s ease}.course-card:hover{transform:translateY(-3px);box-shadow:0 13px 32px rgba(31,50,89,.12)}.card-art{height:145px;position:relative;overflow:hidden;padding:18px}.art-blue{background:linear-gradient(135deg,#dbe8fb,#b8cffa)}.art-mint{background:linear-gradient(135deg,#d7f2e7,#aee0d6)}.art-peach{background:linear-gradient(135deg,#ffe8dd,#f6cfba)}.card-icon{position:relative;z-index:1;background:#fff9;padding:6px 9px;border-radius:8px;color:#344d78;font-size:12px;font-weight:800}.art-glyph{position:absolute;right:31px;bottom:-46px;font-size:165px;line-height:1;color:#fff9;font-weight:200}.card-content{padding:23px 24px 22px}.card-meta{display:block;color:var(--blue);font-size:12px;font-weight:750}.card-content h3{font-size:19px;line-height:1.35;letter-spacing:-.045em;margin:9px 0}.card-content p{font-size:14px;color:var(--muted);margin:0;min-height:44px}.card-bottom{border-top:1px solid var(--line);margin-top:20px;padding-top:15px;display:flex;align-items:center;justify-content:space-between;font-size:12px;color:var(--muted)}.card-arrow{color:var(--blue);font-size:20px;line-height:1}.notice{display:flex;gap:16px;background:#fff;border:1px solid var(--line);border-radius:18px;padding:22px 24px;margin-top:26px}.notice-icon{display:grid;place-items:center;flex:none;width:26px;height:26px;background:#eaf1fc;border-radius:50%;color:var(--blue);font-weight:800;font-size:14px}.notice h2{font-size:15px;margin:0 0 5px}.notice p{font-size:13px;line-height:1.65;color:var(--muted);margin:0}.detail-view[hidden],.home-view[hidden]{display:none}.back-link{display:inline-flex;align-items:center;min-height:44px;color:var(--blue);font-size:14px;font-weight:700;margin-bottom:18px}.detail-layout{display:grid;grid-template-columns:minmax(0,1fr) 280px;gap:26px;align-items:start}.detail-main{min-width:0}.detail-heading{margin-bottom:25px}.tag{display:inline-block;color:var(--blue);background:#e8effc;border-radius:999px;padding:5px 10px;font-size:12px;font-weight:700;margin-bottom:13px}.detail-heading p{color:var(--muted);margin:12px 0 0}.player-wrap{background:#0e1f3b;border-radius:18px;overflow:hidden;box-shadow:var(--shadow)}video{width:100%;display:block;aspect-ratio:16/9;background:#0e1f3b;object-fit:contain}.player-caption{padding:9px 16px;color:#d6e4fa;font-size:12px}.resource-card{display:flex;align-items:center;gap:15px;background:#fff;border:1px solid var(--line);border-radius:17px;padding:20px;margin-top:19px}.resource-icon{display:grid;place-items:center;flex:none;width:45px;height:45px;border-radius:12px;background:#eaf2ff;color:var(--blue);font-size:25px}.resource-card h2{font-size:15px;margin:0 0 3px}.resource-card p{font-size:13px;color:var(--muted);margin:0}.pending{margin-left:auto;flex:none;color:#53627c;background:#f2f5f9;padding:5px 9px;border-radius:7px;font-size:12px}.side-card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:24px;box-shadow:var(--shadow)}.side-card h2{font-size:22px;line-height:1.4;letter-spacing:-.04em;margin:0 0 12px}.side-card p{font-size:13px;color:var(--muted);margin:0}.divider{height:1px;background:var(--line);margin:22px 0}.side-card h3{font-size:15px;margin:0 0 9px}.future-button{display:block;text-align:center;background:#f0f3f8;color:#53627c;font-size:13px;font-weight:700;padding:12px;border-radius:10px;margin-top:17px}.small-note{color:var(--muted);font-size:12px;line-height:1.6;padding:16px 5px}footer{max-width:1460px;margin:auto;padding:0 clamp(24px,5vw,76px) 27px;display:flex;gap:18px;color:#52627c;font-size:12px}@media(max-width:1100px){.shell{grid-template-columns:200px minmax(0,1fr)}.hero-art{width:200px;margin-right:0}.card-grid{gap:12px}.card-content{padding:18px}.detail-layout{grid-template-columns:minmax(0,1fr) 240px}}@media(max-width:900px){.shell{display:block}.sidebar{display:none}.mobile-brand{display:flex}.eyebrow{display:none}.hero{padding:36px}.hero-art{width:165px;height:170px}.card-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:650px){.topbar{height:62px;padding:0 20px}main{padding:20px 16px 52px}.hero{padding:30px 24px;min-height:0}.hero h1{font-size:29px}.hero-copy{font-size:14px}.hero-art{display:none}.section-head{margin:33px 0 15px}.section-head h2{font-size:22px}.card-grid{grid-template-columns:1fr;gap:14px}.card-art{height:125px}.card-content p{min-height:0}.notice{padding:18px}.detail-layout{display:block}.detail-heading h1{font-size:27px}.detail-heading{margin-bottom:19px}.detail-side{margin-top:20px}.resource-card{align-items:start;flex-wrap:wrap}.pending{margin-left:60px}footer{padding:0 16px 24px;display:block}footer span{display:block}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.course-card{transition:none}}

/* ---------- v0.2 추가 ---------- */
.card-grid{list-style:none;margin:0;padding:0;grid-template-columns:repeat(2,minmax(0,1fr))}.card-item{min-width:0;display:flex}.course-card{display:flex;flex-direction:column;width:100%}.card-content{flex:1;display:flex;flex-direction:column}.card-bottom{margin-top:auto}.card-content p{margin-bottom:20px}.card-status{color:var(--blue);font-weight:750}.card-status.done{color:#1f6b45}
.mobile-brand{color:var(--ink)}
.guide-list,.side-list{margin:6px 0 0;padding-left:20px;font-size:13px;line-height:1.65;color:var(--muted)}.guide-list li+li,.side-list li+li{margin-top:4px}.side-list strong{color:var(--ink)}
.player-caption{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap}.watch-progress{font-weight:700;color:#fff}
.seek-note{min-height:0;margin:10px 2px 0;font-size:13px;color:#8a4b00}.seek-note:empty{display:none}
.summary-card{background:#fff;border:1px solid var(--line);border-radius:17px;padding:22px 24px;margin-top:19px}.summary-head{display:flex;align-items:center;gap:10px;margin-bottom:6px}.summary-card h2{font-size:18px;margin:0;letter-spacing:-.03em}.sample-chip{font-size:12px;font-weight:700;color:#7a4a00;background:#fff3dc;border-radius:999px;padding:3px 9px}.summary-card h3{font-size:15px;margin:18px 0 6px}.summary-card ol{margin:0;padding-left:22px;font-size:14px;line-height:1.7;color:#33435e}.summary-card li+li{margin-top:3px}.summary-foot{font-size:12px;color:var(--muted);margin:18px 0 0;border-top:1px solid var(--line);padding-top:12px}
.detail-side{position:sticky;top:20px}.watch-state{font-size:13px;font-weight:700;padding:10px 12px;border-radius:10px;margin:0 0 12px!important;background:#f2f5f9;color:#3d4a60!important}.watch-state[data-state=watched]{background:#e7f6ee;color:#1f5a3a!important}
.submit-button{width:100%;min-height:48px;border:0;border-radius:11px;font:inherit;font-size:15px;font-weight:800;cursor:not-allowed;background:#e9edf3;color:#56627a}.submit-button.ready{background:var(--blue);color:#fff;cursor:pointer}.submit-button.ready:hover{background:#244aa9}
.submit-help{font-size:12px!important;margin:8px 0 0!important}.submit-message{font-size:13px;line-height:1.6;margin-top:10px}.submit-message:empty{display:none}.submit-message[data-kind=warn]{background:#fff6e6;color:#6e4300;border-radius:10px;padding:10px 12px}.submit-message[data-kind=ok]{background:#eaf6ef;color:#1d5236;border-radius:10px;padding:10px 12px}.submit-message a{text-decoration:underline;font-weight:700}
footer{flex-wrap:wrap;align-items:center}.admin-link{margin-left:auto;color:var(--blue);text-decoration:underline;min-height:24px}
@media(max-width:900px){.detail-side{position:static}}
@media(max-width:650px){.card-grid{grid-template-columns:1fr}.summary-card{padding:18px}.admin-link{display:inline-block;margin-top:8px}}

.yt-box{position:relative;width:100%;aspect-ratio:16/9;background:#000;border-radius:inherit;overflow:hidden}
.yt-box iframe,.yt-box #ytPlayer{position:absolute;inset:0;width:100%;height:100%;border:0}