:root{--blue:#06c;--blue-hover:#0057b0;--ink:#19191b;--muted:#717178;--line:#e3e4e8;--paper:#fff;--surface:#f5f5f7;--radius:16px;--shadow:0 8px 28px #121a2a0b}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:82px}body{background:var(--paper);color:var(--ink);-webkit-font-smoothing:antialiased;letter-spacing:-.025em;margin:0;font-family:Arial,Apple SD Gothic Neo,Noto Sans KR,Malgun Gothic,sans-serif;line-height:1.6}a{color:inherit;text-decoration:none}button,input,select,textarea{font:inherit;letter-spacing:inherit}button,a,input,textarea,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled,input:disabled{cursor:not-allowed}button:disabled{opacity:.48}a,button,input,select,textarea{outline-offset:4px}:focus-visible{outline:3px solid #79b9ff}::selection{color:#0c3568;background:#cbe6ff}h1,h2,h3,h4,p{margin:0}h1,h2,h3,h4{letter-spacing:-.055em;line-height:1.3}h1{font-size:40px;font-weight:750}h2{font-size:26px;font-weight:700}h3{font-size:19px;font-weight:700}img,svg{max-width:100%}ul,ol{padding-left:22px}main{min-height:calc(100vh - 248px)}.container{width:min(1120px,100% - 64px);margin-inline:auto}.narrow{width:min(480px,100% - 40px);margin-inline:auto}.page-content{padding-top:60px;padding-bottom:88px}.page-header{margin-bottom:32px}.page-header h1{margin-bottom:12px}.page-header>.muted{max-width:730px;line-height:1.7}.eyebrow{color:var(--muted);letter-spacing:.035em;margin-bottom:10px;font-size:12px;font-weight:650}.muted{color:var(--muted);font-size:14px}.small{font-size:13px}.panel{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:30px}.panel h2,.panel h3{margin-bottom:16px}.panel+.panel{margin-top:22px}.button{border:1px solid var(--blue);background:var(--blue);color:#fff;text-align:center;white-space:nowrap;border-radius:999px;justify-content:center;align-items:center;gap:12px;min-height:48px;padding:11px 25px;font-size:15px;font-weight:650;line-height:1.4;transition:background .18s,border-color .18s,box-shadow .18s;display:inline-flex}.button:hover{background:var(--blue-hover);border-color:var(--blue-hover);box-shadow:0 4px 14px #0066cc1a}.button-secondary{color:var(--blue);border-color:var(--blue);background:0 0}.button-secondary:hover{border-color:var(--blue);box-shadow:none;background:#edf6ff}.button-small{min-height:36px;padding:7px 16px;font-size:13px}.button-block{width:100%}.button-danger{background:#b52b38;border-color:#b52b38}.text-link{color:var(--blue);align-items:center;gap:7px;font-size:14px;font-weight:600;display:inline-flex}.text-link:hover{text-underline-offset:4px;text-decoration:underline}.site-header{color:#fff;z-index:20;background:#171719;border-bottom:1px solid #2c2c2e;min-height:64px;position:relative}.header-inner{justify-content:space-between;align-items:center;gap:32px;width:min(1120px,100% - 64px);min-height:64px;margin-inline:auto;display:flex}.brand{letter-spacing:-.045em;white-space:nowrap;align-items:baseline;gap:5px;font-size:23px;font-weight:750;line-height:1;display:inline-flex}.brand-dot{background:var(--blue);border-radius:50%;width:5px;height:5px;margin-left:1px;display:block}.main-nav{color:#c9c9d0;letter-spacing:-.02em;align-items:center;gap:27px;font-size:13px;display:flex}.main-nav>a:not(.button):hover{color:#fff}.main-nav form{display:flex}.main-nav .nav-join{color:#fff;min-height:34px;padding:6px 20px;font-size:12px}.nav-signout{color:#c9c9d0;white-space:nowrap;background:0 0;border:0;padding:0;font-size:12px}.nav-signout:hover{color:#fff}.hero{text-align:center;background:#fff;overflow:hidden}.hero-inner{padding-top:69px;padding-bottom:73px}.hero-kicker{letter-spacing:-.02em;color:#707078;justify-content:center;align-items:center;gap:8px;margin-bottom:22px;font-size:15px;font-weight:500;display:inline-flex}.hero-kicker>span{background:var(--blue);border-radius:50%;width:6px;height:6px}.hero h1{letter-spacing:-.07em;text-wrap:balance;font-size:clamp(36px,4.45vw,62px);font-weight:800;line-height:1.23}.hero-description{color:#727278;letter-spacing:-.035em;margin-top:24px;font-size:20px;font-weight:450}.hero-actions{justify-content:center;align-items:center;gap:14px;margin-top:32px;display:flex}.hero-actions .button{min-width:157px;min-height:52px;padding-inline:28px;font-size:15px}.course-feature{color:#fff;text-align:center;background:#1c1c1e;position:relative;overflow:hidden}.course-feature-inner{padding-top:52px;padding-bottom:28px;position:relative}.course-feature .eyebrow{color:#b6b6be;font-size:13px;font-weight:500}.course-feature h2{letter-spacing:-.055em;font-size:42px;font-weight:750}.course-feature-meta{color:#bcbcc3;margin-top:12px;font-size:15px}.course-feature-meta span{padding-inline:5px}.course-price{letter-spacing:-.055em;margin-top:15px;margin-bottom:20px;font-size:40px;font-weight:750;line-height:1.3}.course-price span{margin-left:3px;font-size:28px}.course-feature .button{min-height:44px;padding-inline:25px;font-size:14px}.course-footnote{color:#888891;margin-top:2px;font-size:11px}.course-cover{isolation:isolate;width:510px;height:340px;margin:22px auto 0;position:relative}.cover-sheet{color:#1b1b1e;background:#fff;border:1px solid #dedfe3;border-radius:2px;flex-direction:column;align-items:center;width:211px;height:274px;padding:55px 14px 22px;display:flex;position:absolute;top:28px;box-shadow:0 25px 30px #0004}.cover-sheet>span{letter-spacing:-.035em;font-size:11px;font-weight:650}.cover-sheet>i{background:#c4c5cb;width:16px;height:1px;margin-top:22px;margin-bottom:17px;display:block}.cover-sheet>strong{letter-spacing:-.05em;font-size:25px;font-weight:750;line-height:1.3}.cover-sheet>small{letter-spacing:.08em;margin-top:auto;font-size:9px}.cover-sheet-front{z-index:2;background:linear-gradient(110deg,#fff 35%,#f1f1f4);left:79px;transform:perspective(850px)rotateY(-8deg)rotate(-7deg);box-shadow:-3px 8px 1px #bcbcc91a,0 24px 24px #0005}.cover-sheet-back{z-index:1;color:#6d6d75;background:linear-gradient(105deg,#dddddf,#fbfbfc 85%);width:185px;height:250px;padding-top:47px;top:52px;left:253px;transform:perspective(850px)rotateY(9deg)rotate(8deg)}.cover-sheet-back>strong{font-size:22px}.cover-ground{z-index:0;filter:blur(8px);background:radial-gradient(#b1b1bd23,#0000 65%);height:48px;position:absolute;bottom:12px;left:20px;right:0}.course-cover-compact{transform-origin:top;width:280px;height:190px;margin:0}.course-cover-compact .cover-sheet{width:115px;height:150px;padding:25px 8px 13px;top:16px}.course-cover-compact .cover-sheet-front{left:42px}.course-cover-compact .cover-sheet-back{width:103px;height:137px;top:28px;left:139px}.course-cover-compact .cover-sheet>span{font-size:7px}.course-cover-compact .cover-sheet>strong{font-size:15px}.course-cover-compact .cover-sheet>small{font-size:6px}.course-cover-compact .cover-sheet>i{width:10px;margin-top:11px;margin-bottom:10px}.home-reviews{background:#f5f5f7;padding:55px 0 62px}.section-heading{justify-content:space-between;align-items:end;gap:24px;margin-bottom:24px;display:flex}.section-heading .eyebrow{margin-bottom:6px;font-size:11px}.section-heading h2{font-size:30px}.review-empty{background:#fff;border:1px solid #dedfe4;border-radius:14px;align-items:center;gap:25px;padding:30px 34px;display:flex}.review-empty-mark{color:#d8e8fb;align-self:center;font:76px/.8 Georgia,serif;transform:translateY(12px)}.review-empty h3{letter-spacing:-.03em;margin-bottom:6px;font-size:16px;font-weight:650}.review-empty p{color:var(--muted);font-size:13px}.site-footer{background:#f0f0f3;border-top:1px solid #e6e6eb;padding:32px 0 22px}.footer-top{justify-content:space-between;align-items:flex-start;gap:28px;display:flex}.site-footer .brand{padding-top:5px;font-size:20px}.footer-links{flex-direction:column;align-items:flex-end;gap:15px;display:flex}.social-links{color:var(--blue);align-items:center;gap:24px;font-size:13px;display:flex}.social-links a:hover{text-underline-offset:3px;text-decoration:underline}.link-unavailable{color:#93939c;cursor:default}.policy-links{color:#71717b;gap:15px;font-size:11px;display:flex}.policy-links a:hover{color:var(--ink)}.footer-bottom{color:#92929a;letter-spacing:0;border-top:1px solid #dfdfe5;justify-content:space-between;gap:14px;margin-top:25px;padding-top:27px;font-size:10px;display:flex}.form-stack{flex-direction:column;gap:21px;display:flex}.form-stack>.button{width:100%;margin-top:3px}.field{text-align:left;flex-direction:column;gap:8px;font-size:13px;font-weight:600;display:flex}.field>span,.field>label{color:#33333a;font-size:13px;font-weight:600}.field input,.field select,.field textarea,input.field,select.field,textarea.field{width:100%;min-height:48px;color:var(--ink);background:#fff;border:1px solid #d7d9df;border-radius:9px;padding:12px 14px;font-size:14px;font-weight:400;transition:border-color .15s,box-shadow .15s}.field input:focus,.field select:focus,.field textarea:focus{border-color:var(--blue);outline:none;box-shadow:0 0 0 3px #0066cc13}.field input::placeholder,.field textarea::placeholder{color:#a0a0a8}.field textarea{resize:vertical;min-height:120px}.field input[type=file]{padding:8px;font-size:12px}.field input::file-selector-button{color:#333;cursor:pointer;background:#efeff3;border:0;border-radius:5px;margin-right:12px;padding:7px 10px}.field small{color:var(--muted);font-size:12px;font-weight:400}.checkbox-row{align-items:flex-start;gap:10px;font-size:13px;font-weight:400;line-height:1.6;display:flex}.checkbox-row input[type=checkbox]{width:17px;min-width:17px;height:17px;min-height:17px;accent-color:var(--blue);border-radius:3px;margin:2px 0 0;padding:0}.checkbox-row a{color:var(--blue);text-underline-offset:3px}.checkbox-row a:hover{text-decoration:underline}.notice,.error{border-radius:10px;padding:15px 18px;font-size:13px;line-height:1.7}.notice{color:#365477;background:#edf5ff;border:1px solid #daeafb}.error{color:#ad2d3d;background:#fff1f2;border:1px solid #f4d9de}.notice a,.error a{text-underline-offset:3px;text-decoration:underline}.notice+.panel,.error+.panel{margin-top:22px}.form-divider{background:var(--line);border:0;width:100%;height:1px;margin:5px 0}.form-footer{text-align:center;color:var(--muted);margin-top:25px;font-size:13px}.form-footer a{color:var(--blue);margin-left:6px}.split{grid-template-columns:minmax(0,1.45fr) minmax(300px,1fr);align-items:start;gap:28px;display:grid}.course-card{border:1px solid var(--line);background:#fff;border-radius:16px;overflow:hidden}.course-card-body{padding:25px}.course-card .course-cover{background:#222226;border-radius:0}.course-card h2,.course-card h3{margin-bottom:10px}.course-card p+.button{margin-top:20px}.status-badge{color:#1962ab;white-space:nowrap;letter-spacing:-.02em;background:#edf5ff;border-radius:30px;align-items:center;gap:6px;padding:6px 10px;font-size:11px;font-weight:650;line-height:1.3;display:inline-flex}.status-badge:before{content:"";background:currentColor;border-radius:50%;width:4px;height:4px;display:block}.stats-grid{grid-template-columns:repeat(4,minmax(0,1fr));gap:16px;margin-bottom:26px;display:grid}.stat{border:1px solid var(--line);background:#fff;border-radius:14px;padding:22px}.stat>.muted,.stat>p:first-child{color:var(--muted);margin-bottom:12px;font-size:12px}.stat strong,.stat h2{letter-spacing:-.055em;font-size:28px;font-weight:750;line-height:1.3;display:block}.stat small{color:var(--muted);margin-top:8px;font-size:11px;display:block}.table-wrap{border:1px solid var(--line);background:#fff;border-radius:13px;width:100%;overflow-x:auto}table{border-collapse:collapse;text-align:left;width:100%;font-size:13px}th{color:#73737c;white-space:nowrap;border-bottom:1px solid var(--line);background:#f8f8fa;padding:14px 20px;font-size:11px;font-weight:550}td{vertical-align:middle;border-bottom:1px solid #ececf0;padding:18px 20px;line-height:1.55}tbody tr:last-child td{border-bottom:none}tbody tr:hover{background:#fcfcfe}td .button{min-height:33px;padding:6px 13px;font-size:11px}td .muted{font-size:11px}td form{gap:8px;display:inline-flex}.toolbar{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px;margin-bottom:20px;display:flex}.toolbar h2{font-size:20px}.toolbar>input,.toolbar>select{border:1px solid var(--line);background:#fff;border-radius:8px;padding:10px 13px;font-size:13px}.inline{flex-wrap:wrap;align-items:center;gap:12px;display:flex}.inline>.button{flex-shrink:0}.sidebar-layout{grid-template-columns:180px minmax(0,1fr);align-items:start;gap:38px;display:grid}.sidebar-nav{border-right:1px solid var(--line);flex-direction:column;gap:5px;min-height:330px;padding-right:20px;display:flex}.sidebar-nav a{color:var(--muted);border-radius:8px;align-items:center;gap:9px;padding:11px 14px;font-size:13px;line-height:1.5;display:flex}.sidebar-nav a:hover{color:var(--ink);background:#f5f6f9}.sidebar-nav .active{color:var(--blue);background:#eaf3ff;font-weight:650}.sidebar-nav .eyebrow{margin-top:10px;margin-bottom:8px;padding-left:14px;font-size:10px}.viewer{background:#e7e8ec;border:1px solid #d8d9df;border-radius:12px;min-height:680px;position:relative;overflow:hidden}.viewer iframe,.viewer object{border:0;width:100%;height:76vh;min-height:650px;display:block}.viewer-toolbar{background:#fff;border-bottom:1px solid #d8d9df;justify-content:space-between;align-items:center;gap:12px;padding:12px 20px;display:flex}.empty-state{text-align:center;flex-direction:column;align-items:center;padding:58px 20px 62px;display:flex}.empty-icon{color:#758ca8;background:#f1f5fb;border-radius:16px;justify-content:center;align-items:center;width:56px;height:56px;margin-bottom:21px;display:flex}.empty-state h2{margin-bottom:9px;font-size:19px;font-weight:650}.empty-state p{max-width:420px;font-size:13px}.empty-state .button{min-height:43px;margin-top:24px;font-size:13px}.prose{color:#4f4f59;font-size:14px;line-height:1.9}.prose h2{color:var(--ink);margin-top:32px;margin-bottom:14px;font-size:21px}.prose h3{color:var(--ink);margin-top:24px;margin-bottom:10px;font-size:17px}.prose p+p{margin-top:14px}.prose a{color:var(--blue);text-decoration:underline}.prose li+li{margin-top:6px}.sr-only{clip:rect(0,0,0,0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}@media (min-width:1500px){.hero-inner{padding-top:86px;padding-bottom:88px}.hero h1{font-size:66px}.course-feature-inner{padding-top:60px}}@media (max-width:960px){.header-inner{gap:22px}.main-nav{gap:18px;font-size:12px}.nav-secondary{display:none}.hero h1{font-size:49px}.hero-inner{padding-top:64px;padding-bottom:64px}.split{grid-template-columns:minmax(0,1fr) minmax(260px,.9fr);gap:20px}.panel{padding:24px}.stats-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.sidebar-layout{grid-template-columns:150px minmax(0,1fr);gap:24px}.sidebar-nav{padding-right:12px}.sidebar-nav a{padding:10px;font-size:12px}}@media (max-width:700px){.container,.header-inner{width:calc(100% - 36px)}.header-inner{flex-wrap:wrap;gap:12px;min-height:62px;padding-block:15px}.brand{font-size:20px}.main-nav{flex-wrap:wrap;gap:15px;font-size:11px}.main-nav .nav-join{min-height:30px;padding:5px 12px;font-size:11px}.nav-signout{font-size:11px}.hero-inner{padding-top:50px;padding-bottom:51px}.hero-kicker{margin-bottom:19px;font-size:12px}.hero h1{letter-spacing:-.065em;font-size:clamp(29px,6.3vw,44px);line-height:1.3}.hero-description{margin-top:20px;font-size:16px}.hero-actions{flex-wrap:wrap;gap:10px;margin-top:25px}.hero-actions .button{min-width:124px;min-height:44px;padding:10px 17px;font-size:12px}.course-feature-inner{padding-top:42px;padding-bottom:22px}.course-feature h2{font-size:35px}.course-feature .eyebrow{font-size:11px}.course-feature-meta{margin-top:10px;font-size:12px}.course-price{margin-top:16px;font-size:34px}.course-price span{font-size:24px}.course-cover{width:360px;height:278px;margin-top:22px}.cover-sheet{width:167px;height:225px;padding-top:41px;top:22px}.cover-sheet-front{left:34px}.cover-sheet-back{width:151px;height:206px;padding-top:37px;top:40px;left:176px}.cover-sheet>span{font-size:9px}.cover-sheet>strong{font-size:21px}.cover-sheet-back>strong{font-size:19px}.cover-sheet>i{margin-top:18px;margin-bottom:14px}.cover-sheet>small{font-size:7px}.course-footnote{font-size:10px}.home-reviews{padding:38px 0 43px}.section-heading{margin-bottom:19px}.section-heading h2{font-size:25px}.section-heading .text-link{font-size:12px}.review-empty{gap:16px;padding:24px 20px}.review-empty h3{font-size:14px}.review-empty p{font-size:12px}.review-empty-mark{font-size:57px}.section-heading .eyebrow{font-size:10px}.footer-top{flex-direction:column;gap:23px}.footer-links{align-items:flex-start;gap:16px}.social-links{gap:22px;font-size:12px}.policy-links{gap:14px;font-size:10px}.footer-bottom{flex-direction:column;gap:7px;margin-top:22px;padding-top:20px}.site-footer{padding-top:27px}.page-content{padding-top:37px;padding-bottom:54px}.page-header{margin-bottom:25px}.page-header h1{font-size:30px}.page-header>.muted{font-size:13px}.panel{border-radius:13px;padding:22px}.split{grid-template-columns:1fr}.stats-grid{gap:12px;margin-bottom:20px}.stat{padding:18px}.stat strong,.stat h2{font-size:25px}.stat>.muted,.stat>p:first-child{font-size:11px}.sidebar-layout{grid-template-columns:1fr;gap:25px}.sidebar-nav{border-right:0;border-bottom:1px solid var(--line);flex-flow:wrap;gap:4px;min-height:0;padding:0 0 12px}.sidebar-nav a{padding:8px 12px}.sidebar-nav .eyebrow{display:none}.toolbar{gap:12px}.toolbar h2{font-size:18px}.toolbar .button{min-height:39px;padding:8px 16px;font-size:12px}.empty-state{padding:40px 5px}.empty-state h2{font-size:17px}.viewer{min-height:520px}.viewer iframe,.viewer object{height:70vh;min-height:520px}.viewer-toolbar{padding:10px 14px}th{padding:12px 15px}td{padding:15px;font-size:12px}.narrow{width:min(480px,100% - 36px)}}@media (max-width:410px){.header-inner{justify-content:center;gap:12px}.main-nav{justify-content:center;width:100%}.hero h1{font-size:27px}.hero-actions{flex-direction:column}.hero-actions .button{width:235px}.course-feature-meta{font-size:11px}.course-cover{margin-left:-180px;left:50%}.policy-links{flex-wrap:wrap;row-gap:7px}.checkbox-row{font-size:12px}.panel{padding:19px}.review-empty{gap:12px}}@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,:before,:after{transition:none!important;animation:none!important}}.footer-merchant{color:#62626a;border-top:1px solid #dfdfe5;margin-top:16px;padding-top:14px;font-size:11px;line-height:1.65}.footer-merchant h2{color:#3e3e46;letter-spacing:-.025em;margin-bottom:6px;font-size:12px;font-weight:650}.footer-merchant dl{flex-wrap:wrap;gap:4px 16px;margin:0;display:flex}.footer-merchant dl>div{align-items:baseline;gap:7px;min-width:0;max-width:100%;display:flex}.footer-merchant dt{flex-shrink:0}.footer-merchant dd{overflow-wrap:anywhere;min-width:0;margin:0}.footer-merchant .merchant-wide{flex-basis:100%}.footer-merchant a:hover{text-underline-offset:3px;text-decoration:underline}.policy-layout{max-width:860px}.policy-notice{margin-bottom:24px}.policy-notice p{margin-top:6px}.policy-layout>nav{flex-wrap:wrap;margin-top:24px}.policy-content{overflow-wrap:anywhere}.policy-content>section+section{border-top:1px solid var(--line);margin-top:28px;padding-top:20px}.policy-content>section:first-child h2{margin-top:0}