.sf-root{--sf-bg-light:#fafaf7;--sf-bg-card-light:#fff;--sf-text-light:#0a0a0a;--sf-text-light-muted:#0a0a0a9e;--sf-text-light-subtle:#0a0a0a66;--sf-text-light-faint:#0a0a0a38;--sf-line-light:#0a0a0a14;--sf-line-light-strong:#0a0a0a24;--sf-bg-dark:#0a0a0a;--sf-bg-dark-soft:#141414;--sf-bg-card-dark:#1a1a1a;--sf-text-dark:#fff;--sf-text-dark-muted:#ffffff9e;--sf-text-dark-subtle:#fff6;--sf-line-dark:#ffffff14;--sf-line-dark-strong:#ffffff24;--sf-gold:#ffb627;--sf-gold-bright:#ffc74d;--sf-gold-deep:#e89e0e;--sf-gold-on-light:#b88308;--sf-gold-soft:#ffb6271a;--sf-gold-medium:#ffb62733;--sf-font-display:var(--font-display,"Paperlogy", "Pretendard Variable", "Pretendard", system-ui, sans-serif);--sf-font-body:var(--font-body,"Pretendard Variable", "Pretendard", -apple-system, BlinkMacSystemFont, system-ui, sans-serif);--sf-ease-out:cubic-bezier(.32, .72, 0, 1);background:var(--sf-bg-light);color:var(--sf-text-light);font-family:var(--sf-font-body);-webkit-font-smoothing:antialiased;min-height:calc(100dvh - 56px);font-size:17px;line-height:1.6;position:relative;overflow-x:hidden}.sf-root *,.sf-root :before,.sf-root :after{box-sizing:border-box}.sf-root .numeric{font-variant-numeric:tabular-nums;font-feature-settings:"tnum"}.sf-root .aurora-light{z-index:0;pointer-events:none;background:radial-gradient(60% 50% at 18% 20%,#a78bfa12,#0000 60%),radial-gradient(70% 60% at 82% 80%,#ffb62714,#0000 60%);animation:80s ease-in-out infinite sf-aurora-shift;position:absolute;inset:0}@keyframes sf-aurora-shift{0%,to{transform:translate(0)}33%{transform:translate(2%,-1%)}66%{transform:translate(-1%,2%)}}.sf-root .screens{z-index:1;position:relative}.sf-root .screen{opacity:0;visibility:hidden;transition:opacity .36s var(--sf-ease-out), transform .36s var(--sf-ease-out);display:none;transform:translateY(8px)}.sf-root .screen.active{opacity:1;visibility:visible;display:block;transform:translateY(0)}.sf-root .brandbar{justify-content:space-between;align-items:center;max-width:1200px;margin:0 auto;padding:22px 28px;display:flex}.sf-root .brand{font-family:var(--sf-font-display);letter-spacing:-.02em;color:var(--sf-text-light);align-items:center;gap:10px;font-size:18px;font-weight:800;display:flex}.sf-root .brand-mark{background:linear-gradient(135deg, var(--sf-gold) 0%, var(--sf-gold-deep) 100%);border-radius:7px;place-items:center;width:26px;height:26px;display:grid;box-shadow:0 4px 14px #ffb6274d}.sf-root .brand-mark:after{content:"";clip-path:polygon(0 0,100% 50%,0 100%);background:#fff;width:9px;height:9px;margin-left:2px}.sf-root .lang-toggle{color:var(--sf-text-light-muted);border:1px solid var(--sf-line-light);cursor:pointer;font:inherit;letter-spacing:.02em;background:0 0;border-radius:8px;align-items:center;gap:6px;padding:6px 10px;font-size:12px;transition:color .2s,border-color .2s;display:inline-flex}.sf-root .lang-toggle:hover{color:var(--sf-text-light);border-color:var(--sf-line-light-strong)}.sf-root .s1-wrap{flex-direction:column;gap:24px;max-width:560px;margin:0 auto;padding:28px 28px 60px;display:flex}.sf-root .sender{background:var(--sf-bg-card-light);border:1px solid var(--sf-line-light);animation:sf-fade-in .5s var(--sf-ease-out) 80ms both;border-radius:14px;align-items:center;gap:14px;padding:14px 16px;display:flex;box-shadow:0 1px 2px #0a0a0a08}.sf-root .sender-avatar{width:40px;height:40px;font-family:var(--sf-font-display);color:#fff;background:linear-gradient(135deg,#a78bfa 0%,#6366f1 100%);border-radius:50%;flex-shrink:0;place-items:center;font-size:16px;font-weight:700;display:grid;box-shadow:0 0 0 3px #a78bfa1a}.sf-root .sender-text{flex-direction:column;flex:1;gap:2px;min-width:0;display:flex}.sf-root .sender-text .who{color:var(--sf-text-light);font-size:15px;font-weight:600}.sf-root .sender-text .who strong{font-weight:700}.sf-root .sender-text .sub{color:var(--sf-text-light-subtle);letter-spacing:.01em;font-size:12.5px}.sf-root .sender-verified{color:#059669;letter-spacing:.02em;background:#10b98114;border:1px solid #10b98138;border-radius:999px;align-items:center;gap:4px;padding:3px 8px 3px 6px;font-size:11px;font-weight:600;display:inline-flex}.sf-root .course{background:var(--sf-bg-card-light);border:1px solid var(--sf-line-light);animation:sf-fade-in .5s var(--sf-ease-out) .16s both;border-radius:24px;flex-direction:column;gap:18px;padding:28px;display:flex;position:relative;overflow:hidden;box-shadow:0 4px 20px #0a0a0a0a}.sf-root .course-head{align-items:flex-start;gap:14px;display:flex}.sf-root .course-icon{background:var(--sf-bg-light);border:1px solid var(--sf-line-light);border-radius:12px;flex-shrink:0;place-items:center;width:48px;height:48px;display:grid}.sf-root .course-meta{flex:1;min-width:0}.sf-root .course-tag{letter-spacing:.08em;text-transform:uppercase;color:var(--sf-gold-on-light);margin-bottom:8px;font-size:11px;font-weight:600;display:inline-block}.sf-root .course-title{font-family:var(--sf-font-display);letter-spacing:-.025em;color:var(--sf-text-light);font-size:30px;font-weight:700;line-height:1.18}.sf-root .course-title .han{color:var(--sf-gold-on-light)}.sf-root .course-title .pcl{font-family:var(--sf-font-body);color:var(--sf-text-light-muted);letter-spacing:-.005em;font-size:.65em;font-weight:600}.sf-root .course-sub{color:var(--sf-text-light-muted);flex-wrap:wrap;align-items:center;gap:6px 10px;margin-top:10px;font-size:14px;display:flex}.sf-root .course-sub .dot{color:var(--sf-text-light-faint)}.sf-root .course-stats{border-top:1px solid var(--sf-line-light);flex-wrap:wrap;gap:18px;padding-top:16px;display:flex}.sf-root .stat{color:var(--sf-text-light-muted);align-items:center;gap:8px;font-size:13.5px;display:flex}.sf-root .stat svg{flex-shrink:0;width:16px;height:16px}.sf-root .stat .v{color:var(--sf-text-light);font-weight:600}.sf-root .reqs{background:var(--sf-bg-card-light);border:1px solid var(--sf-line-light);animation:sf-fade-in .5s var(--sf-ease-out) .24s both;border-radius:14px;padding:18px 20px}.sf-root .reqs-title{letter-spacing:.08em;color:var(--sf-text-light-subtle);text-transform:uppercase;margin-bottom:12px;font-size:12px;font-weight:600}.sf-root .reqs-list{flex-direction:column;gap:10px;margin:0;padding:0;list-style:none;display:flex}.sf-root .reqs-list li{color:var(--sf-text-light);align-items:center;gap:10px;font-size:14.5px;display:flex}.sf-root .reqs-list li .ok{flex-shrink:0;width:18px;height:18px}.sf-root .reqs-list li .or{color:var(--sf-text-light-subtle);letter-spacing:.08em;text-align:center;width:18px;font-size:12px;font-weight:600}.sf-root .reqs-list li code{font-family:var(--sf-font-body);font-variant-numeric:tabular-nums;letter-spacing:.04em;color:var(--sf-gold-on-light);background:var(--sf-gold-soft);border:1px solid var(--sf-gold-medium);border-radius:6px;padding:2px 8px;font-size:13.5px;font-weight:600}.sf-root .actions{animation:sf-fade-in .5s var(--sf-ease-out) .32s both;flex-direction:column;gap:10px;display:flex}.sf-root .btn{width:100%;height:56px;font:inherit;cursor:pointer;transition:transform .18s var(--sf-ease-out), background .18s, border-color .18s, box-shadow .22s, color .18s;letter-spacing:-.005em;border:1px solid #0000;border-radius:14px;justify-content:center;align-items:center;gap:10px;padding:0 22px;font-size:16px;font-weight:600;display:flex}.sf-root .btn-gold{background:var(--sf-gold);color:#0a0a0a}.sf-root .btn-gold:hover{background:var(--sf-gold-bright);transform:translateY(-1px);box-shadow:0 10px 28px #ffb6274d,0 0 0 4px #ffb6271a}.sf-root .btn-gold:disabled{opacity:.5;cursor:not-allowed}.sf-root .btn-gold:disabled:hover{box-shadow:none;background:var(--sf-gold);transform:none}.sf-root .btn-outline-light{background:var(--sf-bg-card-light);color:var(--sf-text-light);border-color:var(--sf-line-light-strong)}.sf-root .btn-outline-light:hover{background:#fff;border-color:#0a0a0a47;box-shadow:0 4px 16px #0a0a0a0d}.sf-root .btn .arrow{opacity:.55;margin-left:auto;transition:transform .2s,opacity .2s}.sf-root .btn:hover .arrow{opacity:1;transform:translate(3px)}.sf-root .tut{color:var(--sf-text-light-muted);text-align:center;animation:sf-fade-in .5s var(--sf-ease-out) .4s both;flex-wrap:wrap;justify-content:center;align-items:center;gap:8px;font-size:14px;display:flex}.sf-root .tut a{color:var(--sf-gold-on-light);cursor:pointer;border-bottom:1px dashed #b8830859;padding-bottom:1px;font-weight:600;text-decoration:none;transition:color .18s,border-color .18s}.sf-root .tut a:hover{color:var(--sf-gold-deep);border-color:var(--sf-gold-on-light)}.sf-root .s1-foot{border-top:1px solid var(--sf-line-light);color:var(--sf-text-light-subtle);text-align:center;animation:sf-fade-in .5s var(--sf-ease-out) .48s both;flex-direction:column;gap:6px;margin-top:8px;padding-top:22px;font-size:12.5px;line-height:1.6;display:flex}.sf-root .s1-foot a{color:var(--sf-text-light-muted);border-bottom:1px solid var(--sf-line-light);padding-bottom:1px;text-decoration:none;transition:color .18s,border-color .18s}.sf-root .s1-foot a:hover{color:var(--sf-text-light);border-color:var(--sf-line-light-strong)}@keyframes sf-fade-in{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.sf-root .demo-nav{z-index:60;border:1px solid var(--sf-line-light-strong);-webkit-backdrop-filter:blur(14px);background:#ffffffeb;border-radius:14px;flex-direction:column;align-items:stretch;max-width:calc(100vw - 24px);display:flex;position:fixed;bottom:20px;right:20px;overflow:hidden;box-shadow:0 10px 40px #0a0a0a1a}.sf-root .demo-nav-head{border-bottom:1px solid var(--sf-line-light);-webkit-user-select:none;user-select:none;justify-content:space-between;align-items:center;gap:10px;padding:8px 12px;display:flex}.sf-root .demo-nav-head .label{letter-spacing:.14em;text-transform:uppercase;color:var(--sf-text-light-subtle);font-size:10px;font-weight:600}.sf-root .demo-nav-head .pill{letter-spacing:.14em;text-transform:uppercase;color:var(--sf-gold-on-light);background:var(--sf-gold-soft);border:1px solid var(--sf-gold-medium);border-radius:999px;padding:2px 6px;font-size:9.5px}.sf-root .demo-nav-list{grid-template-columns:repeat(2,1fr);gap:0;display:grid}.sf-root .demo-nav-btn{border:none;border-right:1px solid var(--sf-line-light);border-bottom:1px solid var(--sf-line-light);color:var(--sf-text-light-muted);text-align:left;cursor:pointer;font:inherit;background:0 0;flex-direction:column;align-items:flex-start;gap:2px;padding:10px 12px;font-size:12.5px;transition:background .18s,color .18s;display:flex}.sf-root .demo-nav-btn:nth-child(2n){border-right:none}.sf-root .demo-nav-btn:nth-last-child(-n+2){border-bottom:none}.sf-root .demo-nav-btn:hover{color:var(--sf-text-light);background:#0a0a0a08}.sf-root .demo-nav-btn .num{letter-spacing:.14em;color:var(--sf-text-light-faint);text-transform:uppercase;font-size:9.5px;font-weight:600}.sf-root .demo-nav-btn.active{background:var(--sf-gold-soft);color:var(--sf-gold-on-light)}.sf-root .demo-nav-btn.active .num{color:var(--sf-gold-deep)}.sf-root .ob{background:var(--sf-bg-light);min-height:calc(100dvh - 56px);transition:background .8s var(--sf-ease-out), color .8s var(--sf-ease-out);position:relative}.sf-root .ob.dark{background:var(--sf-bg-dark);color:var(--sf-text-dark)}.sf-root .ob-top{z-index:4;justify-content:space-between;align-items:center;padding:22px 28px;display:flex;position:absolute;top:0;left:0;right:0}.sf-root .ob-dots{align-items:center;gap:6px;display:flex}.sf-root .ob-dot{background:#0a0a0a1a;border-radius:999px;width:24px;height:4px;transition:background .36s,width .36s}.sf-root .ob.dark .ob-dot{background:#ffffff24}.sf-root .ob-dot.done{background:var(--sf-gold-on-light)}.sf-root .ob.dark .ob-dot.done{background:var(--sf-gold)}.sf-root .ob-dot.current{background:var(--sf-gold-on-light);width:44px}.sf-root .ob.dark .ob-dot.current{background:var(--sf-gold)}.sf-root .ob-skip{cursor:pointer;font:inherit;letter-spacing:.04em;color:var(--sf-text-light-subtle);background:0 0;border:none;font-size:12.5px;transition:color .2s}.sf-root .ob.dark .ob-skip{color:var(--sf-text-dark-subtle)}.sf-root .ob-skip:hover{color:var(--sf-text-light-muted)}.sf-root .ob.dark .ob-skip:hover{color:var(--sf-text-dark-muted)}.sf-root .ob-stage{place-items:center;min-height:calc(100dvh - 56px);padding:80px 28px;display:grid;position:relative}.sf-root .ob-slide{text-align:center;opacity:0;pointer-events:none;transition:opacity .5s var(--sf-ease-out), transform .5s 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48px;position:absolute;inset:0;-webkit-mask-image:radial-gradient(#000 30%,#0000 80%);mask-image:radial-gradient(#000 30%,#0000 80%)}.sf-root .v4-video-placeholder{color:#0a0a0a8c;flex-direction:column;align-items:center;gap:18px;display:flex;position:relative}.sf-root .v4-video-placeholder .play-orb{color:#0a0a0a;background:linear-gradient(135deg,#ffb6278c,#e89e0e59);border:1px solid #b8830880;border-radius:999px;place-items:center;width:88px;height:88px;display:grid;box-shadow:0 0 60px #ffb62766}.sf-root .v4-video-placeholder .play-orb svg{width:32px;height:32px;margin-left:4px}.sf-root .v4-video-placeholder .label{letter-spacing:.06em;text-transform:uppercase;color:#0a0a0a8c;font-size:13px;font-weight:600}.sf-root .v4-fab{display:none}.sf-root .v4-controls{z-index:2;background:linear-gradient(#fff0 0%,#fafaf7eb 38%,#fafaf7 100%);flex-direction:column;flex-shrink:0;gap:8px;margin-top:-56px;padding:14px 22px 18px;display:flex;position:relative}.sf-root 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