:root{
  color-scheme:dark;
  --bg:#080808;--panel:#121212;--line:#292929;--muted:#9b9b9b;
  --text:#f5f5f5;--accent:#ffffff;
}
*{box-sizing:border-box}
html{background:var(--bg);scroll-behavior:smooth}
body{
  margin:0;min-height:100vh;color:var(--text);
  font-family:Inter,Arial,"Noto Sans KR",sans-serif;
  background:
    radial-gradient(circle at 76% 5%,rgba(255,255,255,.11),transparent 24%),
    radial-gradient(circle at 10% 28%,rgba(255,255,255,.05),transparent 25%),
    var(--bg);
}
button,input{font:inherit}
button{cursor:pointer}
.wrap{width:min(1160px,calc(100% - 40px));margin-inline:auto}
.noise{
  pointer-events:none;position:fixed;inset:0;z-index:20;opacity:.025;
  background-image:url("data:image/svg+xml,%3Csvg viewBox='0 0 180 180' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.8' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.8'/%3E%3C/svg%3E")
}
.hero{min-height:510px;border-bottom:1px solid var(--line)}
.nav{height:78px;display:flex;align-items:center;justify-content:space-between}
.brand{font-size:18px;font-weight:900;letter-spacing:.17em}
.nav-badge,.kicker{
  font-size:11px;font-weight:800;letter-spacing:.2em;color:var(--muted)
}
.nav-badge{border:1px solid #393939;border-radius:100px;padding:9px 13px}
.hero-content{padding-top:77px}
.hero h1{
  margin:12px 0 22px;font-size:clamp(48px,7.2vw,92px);
  line-height:.99;letter-spacing:-.065em
}
.hero-copy{margin:0;color:#aaa;line-height:1.75;font-size:16px}
.main{padding:65px 0 110px}
.gate{
  max-width:520px;margin:15px auto;padding:38px;border:1px solid var(--line);
  border-radius:22px;background:rgba(18,18,18,.9);box-shadow:0 24px 80px rgba(0,0,0,.35)
}
.gate h2,.section-title h2{margin:9px 0 10px;font-size:31px;letter-spacing:-.04em}
.gate>p:not(.kicker):not(.error){color:var(--muted);line-height:1.6}
#gate-form{display:flex;gap:10px;margin-top:25px}
#gate-form input{
  min-width:0;flex:1;padding:15px 16px;border:1px solid #414141;
  border-radius:11px;background:#070707;color:#fff;outline:none
}
#gate-form input:focus{border-color:#888}
#gate-form button{
  padding:0 22px;border:0;border-radius:11px;background:#fff;color:#080808;font-weight:800
}
.error{min-height:1.4em;margin-bottom:0;color:#ff8f8f!important}
.section-title{display:flex;align-items:flex-end;justify-content:space-between;margin-bottom:28px}
.outline-button{
  padding:11px 16px;border:1px solid #404040;border-radius:10px;
  background:transparent;color:#ddd
}
.course-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
.course{
  position:relative;min-height:310px;overflow:hidden;padding:0;border:1px solid #2b2b2b;
  border-radius:19px;background:#151515;color:#fff;text-align:left;
  transition:transform .2s ease,border-color .2s ease,box-shadow .2s ease
}
.course:hover{transform:translateY(-5px);border-color:#686868;box-shadow:0 22px 55px rgba(0,0,0,.33)}
.course-art{
  height:176px;padding:20px;display:flex;align-items:flex-start;justify-content:space-between;
  background:
    radial-gradient(circle at 78% 24%,var(--glow,rgba(255,255,255,.35)),transparent 25%),
    linear-gradient(135deg,var(--shade1,#4a4a4a),var(--shade2,#151515))
}
.course-index{font-size:11px;font-weight:800;letter-spacing:.18em;color:rgba(255,255,255,.65)}
.play{
  width:44px;height:44px;display:grid;place-items:center;border:1px solid rgba(255,255,255,.55);
  border-radius:50%;background:rgba(0,0,0,.18);backdrop-filter:blur(8px)
}
.course-body{padding:22px}
.course-body h3{margin:0 0 9px;font-size:21px;letter-spacing:-.03em}
.course-meta{display:flex;gap:10px;color:#929292;font-size:12px}
.progress{height:3px;margin-top:20px;border-radius:99px;background:#303030;overflow:hidden}
.progress span{display:block;height:100%;width:0;background:#fff}
.course.watched .progress span{width:100%}
.course.watched::after{
  content:"시청함";position:absolute;right:20px;bottom:19px;color:#aaa;font-size:11px
}
.security-note{margin:32px 0 0;color:#757575;font-size:12px;line-height:1.65}
dialog{
  width:min(1080px,calc(100% - 22px));padding:0;border:1px solid #333;border-radius:18px;
  background:#080808;color:#fff;box-shadow:0 30px 120px rgba(0,0,0,.7)
}
dialog::backdrop{background:rgba(0,0,0,.89);backdrop-filter:blur(5px)}
.dialog-head{
  min-height:68px;padding:13px 17px 13px 21px;display:flex;align-items:center;
  justify-content:space-between;border-bottom:1px solid #292929
}
.dialog-head small{display:block;margin-bottom:4px;color:#777;font-size:9px;letter-spacing:.18em}
.dialog-head strong{font-size:16px}
#player-close{
  width:40px;height:40px;border:0;border-radius:50%;background:#242424;color:#fff;font-size:27px
}
.player-area{position:relative;aspect-ratio:16/9;background:#000}
.player-area iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.loader{position:absolute;inset:0;display:grid;place-content:center;justify-items:center;color:#909090;font-size:13px}
.loader span{
  width:30px;height:30px;border:2px solid #333;border-top-color:#fff;border-radius:50%;
  animation:spin .8s linear infinite
}
@keyframes spin{to{transform:rotate(360deg)}}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
@media(max-width:860px){.course-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:570px){
  .wrap{width:min(100% - 28px,1160px)}.hero{min-height:445px}.nav{height:68px}
  .nav-badge{display:none}.hero-content{padding-top:64px}.hero h1{font-size:51px}
  .main{padding-top:42px}.course-grid{grid-template-columns:1fr}.course{min-height:285px}
  .gate{padding:26px}#gate-form{display:block}#gate-form input,#gate-form button{width:100%}
  #gate-form button{height:49px;margin-top:10px}
}