:root{
  --bg:#050505;--bg-soft:#0a0a0a;--surface:#101010;
  --navy:#f4f4f5;--navy-soft:#d4d4d8;
  --blue:#4ade80;--blue-soft:rgba(74,222,128,.09);--blue-deep:#22c55e;
  --accent:#4ade80;--text:#d4d4d8;--muted:#8a8a91;--line:#29292d;
  --grid-line:rgba(255,255,255,.022);--focus:#4ade80;
  --header-bg:rgba(5,5,5,.88);--footer-bg:#020202;--submenu-bg:#080808;
  --field-bg:#080808;--field-invalid:#170909;--cta-text:#050505;
  --glow-top:rgba(255,255,255,.08);--glow-bottom:rgba(74,222,128,.045);
  --sans:"Pretendard Variable","Pretendard",system-ui,sans-serif;
  --mono:var(--sans);
  --maxw:1080px;--maxw-text:720px;--radius:10px;
}

:root[data-theme="light"]{
  --bg:#f7f8f6;--bg-soft:#eef1ed;--surface:#ffffff;
  --navy:#151815;--navy-soft:#272b27;
  --blue:#16833f;--blue-soft:rgba(22,131,63,.08);--blue-deep:#0d6b31;
  --accent:#16833f;--text:#343934;--muted:#687068;--line:#d7dcd7;
  --grid-line:rgba(21,24,21,.035);--focus:#16833f;
  --header-bg:rgba(247,248,246,.9);--footer-bg:#eef1ed;--submenu-bg:#ffffff;
  --field-bg:#ffffff;--field-invalid:#fff1f1;--cta-text:#ffffff;
  --glow-top:rgba(255,255,255,.92);--glow-bottom:rgba(22,131,63,.045);
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;overflow-x:hidden;background:var(--bg);color:var(--text);font-family:var(--sans);font-variant-numeric:tabular-nums;line-height:1.7;letter-spacing:.005em;word-break:keep-all;overflow-wrap:break-word;text-wrap:pretty}
body::before{position:fixed;inset:0;z-index:-2;background:radial-gradient(110% 70% at 50% -10%,var(--glow-top),transparent 58%),radial-gradient(100% 70% at 50% 115%,var(--glow-bottom),transparent 62%);content:"";pointer-events:none}
body::after{position:fixed;inset:0;z-index:-1;background-image:linear-gradient(var(--grid-line) 1px,transparent 1px),linear-gradient(90deg,var(--grid-line) 1px,transparent 1px);background-size:46px 46px;mask-image:radial-gradient(90% 80% at 50% 25%,#000,transparent 88%);content:"";pointer-events:none}
a{color:inherit;text-decoration-thickness:1px;text-underline-offset:.2em}
img,svg{display:block;max-width:100%}
h1,h2,h3{color:var(--navy);font-family:var(--mono);line-height:1.3}
h1,h2{text-wrap:balance}
h3{text-wrap:pretty}
h1{font-size:clamp(2rem,4.6vw,3.6rem);font-weight:700;letter-spacing:-.025em;text-shadow:0 0 30px rgba(255,255,255,.08)}
h2{font-size:clamp(1.45rem,3vw,2.15rem);font-weight:700;letter-spacing:-.015em}
:focus-visible{outline:3px solid var(--focus);outline-offset:3px}
.skip-link{position:fixed;z-index:100;top:1rem;left:1rem;padding:.65rem 1rem;background:var(--navy);color:#fff;transform:translateY(-200%)}
.skip-link:focus{transform:translateY(0)}
.container,.site-header__inner,.site-footer__inner{width:min(calc(100% - 2rem),var(--maxw));margin-inline:auto}
.text-width{max-width:var(--maxw-text)}
.blueprint{background-color:rgba(255,255,255,.012);background-image:repeating-linear-gradient(180deg,rgba(255,255,255,.018) 0 1px,transparent 1px 4px)}
.site-header{position:relative;z-index:10;border-bottom:1px solid var(--line);background:var(--header-bg);backdrop-filter:blur(12px)}
.site-header__inner{display:flex;align-items:center;justify-content:space-between;gap:1.5rem;min-height:72px}
.logo{font-family:var(--mono);font-size:1.05rem;font-weight:700;text-decoration:none;color:var(--navy)}
.logo::before{color:var(--accent);content:"> ";text-shadow:0 0 10px rgba(74,222,128,.4)}
.site-header nav{display:flex;align-items:center;flex-wrap:wrap;justify-content:flex-end;gap:.25rem 1.25rem}
.site-header nav a{padding:.45rem 0;color:var(--muted);font-size:.92rem;text-decoration:none}
.site-header nav a:hover,.site-header nav a[aria-current="page"]{color:var(--blue)}
.site-header nav a[aria-current="page"]{box-shadow:inset 0 -2px var(--blue)}
.nav-group{position:relative;display:flex;align-items:center}
.nav-submenu{position:absolute;z-index:20;top:calc(100% + .35rem);left:-1rem;display:grid;min-width:10rem;padding:.45rem 1rem;border:1px solid var(--line);background:var(--submenu-bg);box-shadow:0 18px 40px rgba(0,0,0,.18);opacity:0;visibility:hidden;transform:translateY(-.35rem);transition:opacity .15s ease,transform .15s ease,visibility .15s ease}
.nav-submenu::before{position:absolute;top:-.4rem;left:1.4rem;color:var(--accent);content:">";font-size:.72rem}
.nav-submenu a{padding:.55rem 0!important;border-bottom:1px solid var(--line);white-space:nowrap}
.nav-submenu a:last-child{border-bottom:0}
.nav-group:hover .nav-submenu,.nav-group:focus-within .nav-submenu{opacity:1;visibility:visible;transform:translateY(0)}
.theme-toggle{min-width:3.7rem;padding:.35rem .55rem;border:1px solid var(--line);border-radius:999px;background:transparent;color:var(--muted);font:700 .66rem/1 var(--sans);letter-spacing:.08em;cursor:pointer}
.theme-toggle:hover{border-color:var(--accent);color:var(--accent)}
.hero{display:grid;align-content:center;min-height:min(66vh,640px);padding-block:clamp(4.5rem,10vw,7.5rem)}
.hero--compact{min-height:auto;padding-block:clamp(4.5rem,8vw,6rem)}
.hero p{max-width:var(--maxw-text);font-size:clamp(1rem,1.55vw,1.12rem);color:var(--muted)}
.prompt-label{display:flex;align-items:center;gap:.65rem;margin-bottom:1.25rem!important;color:var(--muted)!important;font-family:var(--mono);font-size:.75rem!important;letter-spacing:.12em;text-transform:uppercase}
.prompt-label::before{content:">";color:var(--accent);font-weight:700;text-shadow:0 0 10px rgba(74,222,128,.45)}
.section{padding-block:clamp(4.5rem,8vw,7rem)}
.section p{max-width:var(--maxw-text);color:var(--muted)}
.sentence{display:block}
.editorial-list{list-style:none;margin:0;padding:0;border-top:1px solid var(--line)}
.editorial-list li{display:grid;grid-template-columns:minmax(5rem,1fr) 3fr;gap:2rem;padding:1.5rem 0;border-bottom:1px solid var(--line)}
.content-rail{margin-top:2.5rem;border-top:1px solid var(--line)}
.content-rail>div{display:grid;grid-template-columns:minmax(7rem,1fr) 3fr;gap:2rem;padding:1.35rem 0;border-bottom:1px solid var(--line)}
.content-rail p{margin:0}
.section-note{margin-top:1.5rem}
.ai-shell{display:grid;grid-template-columns:10rem minmax(0,1fr);gap:clamp(2.5rem,7vw,6rem);align-items:start}
.ai-rail{position:sticky;top:2rem;display:grid;gap:.15rem;margin-top:5rem;padding-top:.8rem;border-top:1px solid var(--line)}
.ai-rail p{margin:.2rem 0 .8rem;color:var(--muted);font-size:.72rem;font-weight:700;letter-spacing:.12em}
.ai-rail a{padding:.5rem 0;color:var(--muted);text-decoration:none}
.ai-rail a:hover,.ai-rail a[aria-current="page"]{color:var(--accent)}
.ai-rail a[aria-current="page"]::before{margin-right:.5rem;content:">"}
.ai-main{min-width:0}
.ai-entries{margin-top:3rem;border-top:1px solid var(--line)}
.ai-entries>a{display:grid;grid-template-columns:9rem 1fr 1.5fr;gap:1.5rem;align-items:baseline;padding:1.5rem 0;border-bottom:1px solid var(--line);text-decoration:none}
.ai-entries span{color:var(--accent);font-size:.72rem;letter-spacing:.08em}
.ai-entries strong{color:var(--navy);font-size:1.25rem}
.ai-entries p{margin:0!important}
.catalog-heading{display:grid;grid-template-columns:minmax(8rem,1fr) 3fr;gap:2rem;align-items:end;margin-bottom:2.5rem}
.catalog-heading p{margin:0;color:var(--blue);font-family:var(--mono);font-size:.78rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase}
.catalog-heading h2{margin:0}
.status{display:inline-flex;align-items:center;width:max-content;color:var(--muted);font-family:var(--mono);font-size:.72rem;font-weight:700;letter-spacing:.04em}
.status::before{width:.42rem;height:.42rem;margin-right:.45rem;border-radius:50%;background:currentColor;content:""}
.status--free{color:var(--blue)}
.status--paid{color:var(--navy)}
.status--preparing{color:var(--muted)}

.column-hero{padding-bottom:clamp(3rem,6vw,4.5rem)}
.column-index{padding-bottom:clamp(5rem,9vw,8rem)}
.column-filters{display:flex;flex-wrap:wrap;gap:.5rem;padding-block:1.2rem;border-block:1px solid var(--line)}
.column-filters button{padding:.45rem .8rem;border:1px solid transparent;border-radius:999px;background:transparent;color:var(--muted);font:inherit;font-size:.82rem;cursor:pointer}
.column-filters button:hover,.column-filters button[aria-pressed="true"]{border-color:var(--accent);color:var(--accent)}
.column-count{margin:1.35rem 0;color:var(--muted);font-size:.72rem;letter-spacing:.08em}
.column-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));border-top:1px solid var(--line);border-left:1px solid var(--line)}
.column-card{min-width:0;border-right:1px solid var(--line);border-bottom:1px solid var(--line)}
.column-card[hidden]{display:none}
.column-card>a{display:flex;min-height:22rem;flex-direction:column;padding:1.4rem;text-decoration:none;transition:background-color .18s ease,transform .18s ease}
.column-card>a:hover{background:var(--blue-soft);transform:translateY(-2px)}
.column-card__index{display:flex;align-items:center;justify-content:space-between;color:var(--muted);font-size:.7rem;letter-spacing:.08em}
.column-card__index span:first-child{color:var(--accent);font-weight:700}
.column-card h2{margin:3rem 0 .8rem;font-size:clamp(1.18rem,2vw,1.45rem);line-height:1.42}
.column-card p{margin:0;color:var(--muted);font-size:.9rem;line-height:1.65}
.column-card time{margin-top:auto;padding-top:2rem;color:var(--muted);font-size:.72rem;letter-spacing:.06em}

.tool-list{border-block:1px solid var(--line)}
.tool-row{display:grid;grid-template-columns:minmax(7rem,.8fr) minmax(13rem,1.25fr) 2fr;gap:2rem;align-items:start;padding:1.65rem 0;border-bottom:1px dashed var(--line)}
.tool-row:last-child{border-bottom:0}
.tool-row__index{display:flex;flex-direction:column;gap:.8rem}
.tool-row__index>span{color:var(--navy);font-family:var(--mono);font-size:1.1rem;font-weight:700}
.tool-row__purpose p,.tool-row__action p{margin:0 0 .35rem;color:var(--muted);font-family:var(--mono);font-size:.7rem;letter-spacing:.08em;text-transform:uppercase}
.tool-row h2,.tool-row h3{margin:0;font-size:1.18rem}
.tool-row h2 a,.tool-row h3 a{text-decoration-color:var(--line)}
.tool-row__action>span{color:var(--text)}

.class-list{display:grid;gap:1rem}
.class-row{display:grid;grid-template-columns:minmax(10rem,1fr) 3fr;border-left:3px solid var(--accent);background:var(--bg-soft)}
.class-row__audience{display:flex;flex-direction:column;gap:.4rem;padding:1.5rem;border-right:1px solid var(--line)}
.class-row__audience span{color:var(--muted);font-family:var(--mono);font-size:.7rem;letter-spacing:.08em}
.class-row__audience strong{color:var(--navy);font-size:.9rem}
.class-row__course{padding:1.5rem 1.75rem}
.class-row__course>div{display:flex;gap:1rem;align-items:center;color:var(--muted);font-size:.78rem}
.class-row h2,.class-row h3{margin:.45rem 0 .5rem;font-size:1.3rem}
.class-row h2 a,.class-row h3 a{text-decoration-color:var(--line)}
.class-row p{margin:0}
.study-statement h2,.study-loop h2,.study-principles h2,.study-archive h2{max-width:760px;margin-bottom:2.5rem}
.futuretax-hero h1{max-width:860px}
.futuretax-warning{margin:0 0 1rem;padding-left:.75rem;border-left:2px solid var(--accent);color:var(--navy)!important;font-size:.88rem!important;font-weight:700;letter-spacing:.01em}
.countdown{margin-top:clamp(2.5rem,6vw,4.5rem);border-block:1px solid var(--line)}
.countdown time{display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:end;padding:clamp(1.5rem,4vw,2.5rem) 0}
.countdown__day{color:var(--navy);font-size:clamp(3.75rem,10vw,7.5rem);font-weight:300;line-height:1;letter-spacing:-.07em}
.countdown__day strong{font-weight:700}
.countdown__sub{display:flex;gap:1.5rem;padding-bottom:.5rem;color:var(--muted);font-size:.68rem;letter-spacing:.08em}
.countdown__sub span{display:grid;gap:.2rem}
.countdown__sub strong{color:var(--accent);font-size:1.15rem;line-height:1}
.countdown small{grid-column:1/-1;margin-top:1.35rem;color:var(--muted);font-size:.7rem;letter-spacing:.12em}
.profession-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));border-block:1px solid var(--line)}
.profession-grid article{padding:1.75rem;border-right:1px solid var(--line)}
.profession-grid article:last-child{border-right:0}
.profession-grid span{color:var(--accent);font-size:.7rem;letter-spacing:.1em}
.profession-grid h3{margin:2.5rem 0 .7rem;font-size:1.35rem}
.profession-grid p{margin:0;font-size:.9rem}
.study-flow{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));margin:0;padding:0;border-block:1px solid var(--line);list-style:none}
.study-flow li{min-width:0;padding:1.5rem;border-right:1px solid var(--line)}
.study-flow li:last-child{border-right:0}
.study-flow span{display:block;margin-bottom:2rem;color:var(--accent);font-size:.72rem;letter-spacing:.08em}
.study-flow strong{color:var(--navy)}
.study-flow p{margin:.5rem 0 0;font-size:.9rem}
.study-log{border-top:1px solid var(--line)}
.study-log article{display:grid;grid-template-columns:9rem minmax(0,1fr);gap:2rem;padding:2rem 0;border-bottom:1px solid var(--line)}
.study-log time{color:var(--accent);font-size:.72rem;letter-spacing:.08em}
.study-log h3{margin:0 0 .5rem}
.study-log p{margin:0}
.study-join{margin-bottom:clamp(4rem,8vw,7rem);padding:clamp(2rem,5vw,3.5rem)}
.cta-group{display:flex;flex-wrap:wrap;gap:.75rem;margin-top:1.5rem}
.cta{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:.7rem 1.1rem;border:1px solid var(--blue);border-radius:6px;background:var(--blue);color:var(--cta-text);font-family:var(--mono);font-weight:700;text-decoration:none;transition:background-color .15s ease,transform .15s ease}
.cta:hover{background:var(--blue-deep);transform:translateY(-1px)}
.cta--secondary{background:transparent;color:var(--blue)}
.form-section{display:grid;grid-template-columns:minmax(15rem,1fr) minmax(0,1.65fr);gap:clamp(2.5rem,7vw,6rem);align-items:start}
.form-section--compact{grid-template-columns:minmax(15rem,1fr) minmax(18rem,1fr)}
.form-intro>p:first-child{color:var(--blue);font-family:var(--mono);font-size:.78rem;font-weight:700;letter-spacing:.08em}
.form-intro h2{margin:.5rem 0 1rem}
.scope-note{padding-left:1rem;border-left:3px solid var(--blue);font-size:.9rem}
.async-form{padding:clamp(1.35rem,3vw,2rem);border:1px solid var(--line);border-top:2px solid var(--accent);background:var(--surface);box-shadow:0 18px 48px rgba(0,0,0,.3)}
.form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1.15rem}
.field{display:grid;gap:.4rem}
.field--wide{grid-column:1/-1}
.field label{color:var(--navy);font-weight:700}
.field input,.field select,.field textarea{width:100%;min-height:48px;padding:.7rem .8rem;border:1px solid var(--line);border-radius:6px;background:var(--field-bg);color:var(--text);font:inherit}
.field textarea{resize:vertical}
.field input:hover,.field select:hover,.field textarea:hover{border-color:var(--navy)}
.field input:user-invalid,.field select:user-invalid,.field textarea:user-invalid{border-color:#ef4444;background:var(--field-invalid)}
.field-help{color:var(--muted);font-size:.8rem}
.consent{display:flex;gap:.65rem;align-items:flex-start;margin:1.35rem 0;color:var(--text);font-size:.9rem}
.consent input{flex:0 0 auto;width:1.1rem;height:1.1rem;margin-top:.25rem;accent-color:var(--blue)}
.form-submit{border:0;cursor:pointer;font:inherit}
.form-submit:disabled{cursor:wait;opacity:.58;transform:none}
.form-status{min-height:1.7em;margin:.8rem 0 0;font-weight:700}
.form-status[data-status="success"]{color:#047857}
.form-status[data-status="invalid"],.form-status[data-status="error"]{color:#b91c1c}
.honeypot{position:absolute!important;width:1px!important;height:1px!important;overflow:hidden!important;clip:rect(0,0,0,0)!important;white-space:nowrap!important}
.privacy-list{margin:2rem 0;border-top:1px solid var(--navy)}
.privacy-list div{display:grid;grid-template-columns:8rem 1fr;gap:1rem;padding:1rem 0;border-bottom:1px solid var(--line)}
.privacy-list dt{color:var(--navy);font-weight:700}
.privacy-list dd{margin:0;color:var(--muted)}
.site-footer{padding:3rem 0;border-top:1px solid var(--line);background:var(--footer-bg);color:var(--text)}
.site-footer__inner{display:flex;justify-content:space-between;gap:2rem}
.site-footer .logo{color:var(--navy)}
.site-footer p{margin:.5rem 0 0;color:var(--muted);font-size:.85rem}
.site-footer [aria-disabled="true"]{color:var(--muted)}
.site-footer__links{display:flex;flex-direction:column;gap:.45rem;align-items:flex-end}

@media (max-width:900px){
  .column-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .profession-grid{grid-template-columns:1fr}
  .profession-grid article{border-right:0;border-bottom:1px solid var(--line)}
  .profession-grid article:last-child{border-bottom:0}
}

@media (max-width:720px){
  .site-header__inner{align-items:flex-start;flex-direction:column;padding-block:1rem}
  .site-header nav{justify-content:flex-start}
  .theme-toggle{margin-left:auto}
  .nav-submenu{display:none}
  .ai-shell{grid-template-columns:1fr;gap:0}
  .ai-rail{position:static;display:flex;gap:1.25rem;overflow-x:auto;margin-top:1rem;padding:.65rem 0;border-bottom:1px solid var(--line);white-space:nowrap}
  .ai-rail p{margin:.5rem 0}
  .ai-rail a{padding:.4rem 0}
  .ai-entries>a{grid-template-columns:7rem 1fr}
  .ai-entries p{grid-column:2}
  .study-flow{grid-template-columns:repeat(2,minmax(0,1fr))}
  .study-flow li:nth-child(2){border-right:0}
  .study-flow li:nth-child(-n+2){border-bottom:1px solid var(--line)}
  .hero{min-height:auto;padding-block:4.5rem}
  .section{padding-block:3.5rem}
  .catalog-heading{grid-template-columns:minmax(4.75rem,.7fr) minmax(0,2.3fr);gap:.85rem;margin-bottom:1.75rem}
  .tool-row{grid-template-columns:4.75rem minmax(0,1fr);gap:.85rem;padding:1.25rem 0}
  .tool-row__action{grid-column:2}
  .class-row{grid-template-columns:7rem minmax(0,1fr)}
  .class-row__audience,.class-row__course{padding:1.2rem}
  .editorial-list li{grid-template-columns:minmax(4.75rem,.7fr) minmax(0,2.3fr);gap:.85rem}
  .content-rail>div{grid-template-columns:minmax(4.75rem,.7fr) minmax(0,2.3fr);gap:.85rem}
  .site-footer__inner{flex-direction:column}
  .site-footer__links{align-items:flex-start}
  .form-section,.form-section--compact{grid-template-columns:1fr;gap:2rem}
  .form-grid{gap:.9rem}
}

@media (max-width:600px){
  .column-grid{grid-template-columns:1fr}
  .column-card>a{min-height:19rem}
  .countdown time{grid-template-columns:1fr}
  .countdown__day{font-size:clamp(3.6rem,20vw,5.6rem)}
  .countdown__sub{margin-top:1.35rem;padding-bottom:0}
}

@media (max-width:480px){
  .site-header nav{width:100%;justify-content:flex-start;gap:0 1rem}
  .theme-toggle{min-width:3.2rem;margin-left:0;padding-inline:.4rem;font-size:.6rem}
  .site-header nav a{font-size:.78rem}
  h1{font-size:clamp(1.85rem,9.2vw,2.45rem)}
  h1,h2,h3,.hero p,.section p{max-width:100%;word-break:keep-all;overflow-wrap:break-word}
  .hero{padding-block:3.75rem}
  .catalog-heading{display:block}
  .catalog-heading p{margin-bottom:.55rem}
  .tool-row{grid-template-columns:4.5rem minmax(0,1fr)}
  .class-row{grid-template-columns:1fr;border-left-width:3px}
  .class-row__course{order:1;padding:1.15rem}
  .class-row__audience{order:2;flex-direction:row;align-items:baseline;gap:.65rem;padding:.65rem 1.15rem;border-top:1px solid var(--line);border-right:0}
  .class-row__audience strong{font-size:.82rem}
  .study-flow{grid-template-columns:1fr}
  .study-flow li{border-right:0;border-bottom:1px solid var(--line)}
  .study-flow li:last-child{border-bottom:0}
  .study-flow span{margin-bottom:1rem}
  .study-log article{grid-template-columns:1fr;gap:.65rem}
  .editorial-list li:not(.compact){grid-template-columns:1fr;gap:.4rem}
  .cta-group{display:grid;grid-template-columns:1fr}
  .cta-group .cta{width:100%}
  .async-form{padding:1.1rem}
  .form-grid{grid-template-columns:1fr}
  .field--wide{grid-column:auto}
  .form-submit{width:100%}
  .privacy-list div{grid-template-columns:1fr;gap:.25rem}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
}