:root{
  --brand:#0c3c5c;--brand-2:#155a7a;--accent:#19b3a3;--accent-soft:#e6f6f4;--gold:#d3a53a;
  --ink:#0e1b2e;--text:#233047;--muted:#6b7688;--line:#e6e9ef;--bg:#f6f7f9;--card:#fff;
  --ok:#127a4a;--ng:#b42318;--wait:#8a6d00;--r:14px;--max:1180px;
  --c-webinar:#19b3a3;--c-lecture:#5b6cff;--c-seminar:#d3a53a;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:"Pretendard Variable",Pretendard,"Apple SD Gothic Neo",-apple-system,"Helvetica Neue",Arial,sans-serif;font-size:15px;line-height:1.65;color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased;word-break:keep-all}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
button{font:inherit;cursor:pointer}
input,select,textarea{font:inherit;color:inherit}
.wrap{max-width:var(--max);margin:0 auto;padding:0 24px}
[hidden]{display:none!important}

/* ── nav ── */
.nav{position:sticky;top:0;z-index:40;background:rgba(255,255,255,.94);backdrop-filter:saturate(180%) blur(12px);border-bottom:1px solid var(--line)}
.nav .wrap{display:flex;align-items:center;justify-content:space-between;height:66px;gap:16px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:17px;color:var(--brand);letter-spacing:-.01em}
.logo i{width:30px;height:30px;border-radius:9px;background:linear-gradient(135deg,var(--brand),var(--accent));display:inline-flex;align-items:center;justify-content:center;color:#fff;font-style:normal;font-size:13px;font-weight:900}
.logo small{display:block;font-size:11px;font-weight:600;color:var(--muted);letter-spacing:0;margin-top:-2px}
.menu{display:flex;gap:4px}
.menu a{padding:8px 13px;border-radius:9px;font-size:14px;font-weight:600;color:var(--muted)}
.menu a.on,.menu a:hover{color:var(--brand);background:#eef3f7}
.me{display:flex;align-items:center;gap:10px;font-size:13px}
.me .who{text-align:right;line-height:1.3}.me .who b{display:block;font-size:13.5px;color:var(--ink)}.me .who span{color:var(--muted);font-size:12px}
.avatar{width:34px;height:34px;border-radius:50%;background:var(--accent-soft);color:var(--brand);display:inline-flex;align-items:center;justify-content:center;font-weight:800;font-size:13px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:11px 18px;border-radius:10px;border:1.5px solid transparent;font-weight:700;font-size:14px;background:var(--brand);color:#fff;transition:.12s;white-space:nowrap}
.btn:hover{background:var(--brand-2)}.btn:active{transform:translateY(1px)}
.btn.ghost{background:#fff;color:var(--ink);border-color:var(--line)}.btn.ghost:hover{background:#f4f6f9}
.btn.accent{background:var(--accent)}.btn.accent:hover{background:#129c8d}
.btn.sm{padding:7px 12px;font-size:13px;border-radius:8px}
.btn.lg{padding:14px 24px;font-size:15px}
.btn:disabled{opacity:.5;cursor:default}
.btn.danger{background:#fff;color:var(--ng);border-color:#f3c4bf}
.mobile-tabs{display:none}

/* ── layout ── */
main{min-height:calc(100vh - 66px)}
.page{padding:34px 0 72px}
.ph{display:flex;justify-content:space-between;align-items:flex-end;gap:16px;flex-wrap:wrap;margin-bottom:22px}
h1{font-size:26px;margin:0;letter-spacing:-.02em;color:var(--ink)}
h1 small{display:block;font-size:14px;font-weight:500;color:var(--muted);margin-top:4px;letter-spacing:0}
h2{font-size:19px;margin:0 0 14px;letter-spacing:-.01em;color:var(--ink)}
.sec{margin-top:44px}
.sec-hd{display:flex;justify-content:space-between;align-items:baseline;margin-bottom:14px}
.sec-hd a{font-size:13.5px;font-weight:700;color:var(--accent)}
.eyebrow{font-size:12px;font-weight:800;letter-spacing:.12em;color:var(--accent);text-transform:uppercase;margin-bottom:6px}

/* ── hero (home) ── */
.hero{background:linear-gradient(120deg,var(--brand) 0%,var(--brand-2) 55%,#1a8f8a 100%);color:#fff;border-radius:20px;padding:40px 44px;display:grid;grid-template-columns:1.2fr .8fr;gap:32px;position:relative;overflow:hidden}
.hero::after{content:"";position:absolute;right:-80px;top:-80px;width:320px;height:320px;border-radius:50%;background:rgba(255,255,255,.06)}
.hero h1{color:#fff;font-size:30px;line-height:1.3}
.hero p{margin:12px 0 22px;opacity:.9;font-size:15.5px;max-width:520px}
.hero .next{background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.22);border-radius:14px;padding:18px 20px;align-self:center;position:relative}
.hero .next .k{font-size:12px;font-weight:800;letter-spacing:.1em;opacity:.8}
.hero .next b{display:block;font-size:17px;margin:6px 0 4px;line-height:1.35}
.hero .next span{font-size:13px;opacity:.85;display:block}
.hero .next .dday{position:absolute;top:16px;right:18px;background:var(--gold);color:#1a1a1a;font-weight:900;font-size:12px;padding:4px 9px;border-radius:999px}
.hero .btn.ghost{background:transparent;border-color:rgba(255,255,255,.5);color:#fff}
.hero .btn.ghost:hover{background:rgba(255,255,255,.12)}

/* ── filters ── */
.tools{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin-bottom:18px}
.chips{display:flex;gap:6px;flex-wrap:wrap}
.chip{padding:7px 13px;border-radius:999px;border:1.5px solid var(--line);background:#fff;font-size:13px;font-weight:700;color:var(--muted)}
.chip.on{background:var(--ink);color:#fff;border-color:var(--ink)}
.search{margin-left:auto;position:relative}
.search input{width:260px;max-width:100%;padding:9px 12px 9px 36px;border:1.5px solid var(--line);border-radius:10px;background:#fff;font-size:14px}
.search input:focus{outline:none;border-color:var(--accent)}
.search::before{content:"";position:absolute;left:12px;top:50%;width:14px;height:14px;transform:translateY(-50%);border:2px solid var(--muted);border-radius:50%;box-sizing:border-box}
.search::after{content:"";position:absolute;left:23px;top:58%;width:7px;height:2px;background:var(--muted);transform:rotate(45deg)}

/* ── cards ── */
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.grid.two{grid-template-columns:repeat(2,1fr)}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);overflow:hidden;transition:.15s;display:flex;flex-direction:column}
.card:hover{transform:translateY(-2px);box-shadow:0 10px 30px rgba(14,27,46,.08);border-color:#d8dee8}
.thumb{aspect-ratio:16/9;background:linear-gradient(135deg,#123f61,#1c6b86);position:relative;overflow:hidden}
.thumb img{width:100%;height:100%;object-fit:cover}
.thumb.webinar{background:linear-gradient(135deg,#0f5c58,#19b3a3)}
.thumb.lecture{background:linear-gradient(135deg,#2b3a8f,#5b6cff)}
.thumb.seminar{background:linear-gradient(135deg,#8a6318,#d3a53a)}
.thumb .play{position:absolute;left:50%;top:50%;width:48px;height:48px;margin:-24px 0 0 -24px;border-radius:50%;background:rgba(255,255,255,.92);display:flex;align-items:center;justify-content:center}
.thumb .play::after{content:"";border-left:16px solid var(--brand);border-top:10px solid transparent;border-bottom:10px solid transparent;margin-left:4px}
.thumb .dur{position:absolute;right:10px;bottom:10px;background:rgba(0,0,0,.6);color:#fff;font-size:11.5px;font-weight:700;padding:3px 7px;border-radius:6px}
.thumb .cat{position:absolute;left:12px;top:12px;font-size:11.5px;font-weight:800;color:#fff;background:rgba(0,0,0,.28);padding:4px 9px;border-radius:6px;backdrop-filter:blur(4px)}
.thumb .deco{position:absolute;inset:0;background:radial-gradient(circle at 80% 20%,rgba(255,255,255,.18),transparent 45%),radial-gradient(circle at 15% 90%,rgba(255,255,255,.12),transparent 40%)}
.card .bd{padding:16px 18px 18px;display:flex;flex-direction:column;gap:6px;flex:1}
.card h3{font-size:15.5px;margin:0;line-height:1.45;color:var(--ink);letter-spacing:-.01em;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.card p{margin:0;font-size:13.5px;color:var(--muted);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.card .meta{margin-top:auto;padding-top:8px;font-size:12.5px;color:var(--muted);display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.tag{display:inline-block;font-size:11.5px;font-weight:800;padding:3px 8px;border-radius:6px;background:var(--accent-soft);color:var(--brand)}
.tag.gold{background:#fbf3df;color:#8a6318}.tag.red{background:#fdf2f0;color:var(--ng)}.tag.gray{background:#eef0f4;color:var(--muted)}.tag.ok{background:#eaf7ef;color:var(--ok)}

/* docs list */
.doc{display:flex;gap:16px;align-items:center;background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:16px 18px;transition:.15s;cursor:pointer}
.doc:hover{border-color:#d8dee8;box-shadow:0 8px 24px rgba(14,27,46,.06)}
.doc .ic{width:52px;height:64px;border-radius:8px;flex:none;display:flex;align-items:center;justify-content:center;font-size:11px;font-weight:900;letter-spacing:.05em;color:#fff;background:#c0392b;position:relative}
.doc .ic.img{background:var(--brand)}
.doc .tx{flex:1;min-width:0}
.doc h3{margin:0 0 3px;font-size:15.5px;color:var(--ink)}
.doc p{margin:0;font-size:13.5px;color:var(--muted)}
.doc .meta{font-size:12.5px;color:var(--muted);margin-top:6px;display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.doc .act{flex:none;display:flex;gap:6px}
.list{display:flex;flex-direction:column;gap:10px}

/* seminars */
.sem{display:grid;grid-template-columns:96px 1fr auto;gap:20px;align-items:center;background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:20px 22px}
.sem.past{opacity:.72}
.sem .date{text-align:center;border-right:1px solid var(--line);padding-right:16px}
.sem .date b{display:block;font-size:30px;line-height:1;color:var(--brand);letter-spacing:-.02em}
.sem .date span{font-size:12.5px;color:var(--muted);font-weight:700}
.sem h3{margin:0 0 4px;font-size:17px;color:var(--ink)}
.sem p{margin:0;font-size:13.5px;color:var(--muted)}
.sem .meta{margin-top:8px;font-size:13px;color:var(--text);display:flex;gap:14px;flex-wrap:wrap}
.sem .meta span::before{content:"";display:inline-block;width:6px;height:6px;border-radius:50%;background:var(--accent);margin-right:7px;vertical-align:middle}
.dd{font-size:12px;font-weight:900;padding:4px 9px;border-radius:999px;background:var(--gold);color:#1a1a1a}
.dd.soon{background:var(--ng);color:#fff}.dd.past{background:#eef0f4;color:var(--muted)}

/* notices */
.notice{display:flex;gap:14px;align-items:center;background:#fff;border:1px solid var(--line);border-radius:12px;padding:15px 18px;cursor:pointer}
.notice:hover{border-color:#d8dee8}
.notice .tx{flex:1;min-width:0}.notice h3{margin:0;font-size:15px;color:var(--ink);display:flex;gap:8px;align-items:center}
.notice p{margin:2px 0 0;font-size:13px;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.notice time{font-size:12.5px;color:var(--muted);flex:none}

/* detail */
.detail{display:grid;grid-template-columns:1fr 340px;gap:28px;align-items:start}
.player{position:relative;background:#000;border-radius:16px;overflow:hidden;aspect-ratio:16/9}
.player video,.player iframe{width:100%;height:100%;display:block;border:0}
.wm{position:absolute;pointer-events:none;font-size:12px;font-weight:700;color:rgba(255,255,255,.55);text-shadow:0 1px 2px rgba(0,0,0,.6);padding:4px 8px;background:rgba(0,0,0,.18);border-radius:6px;transition:left 1.2s ease,top 1.2s ease;white-space:nowrap;z-index:5}
.player .secure{position:absolute;right:12px;top:12px;font-size:11px;font-weight:800;color:#fff;background:rgba(25,179,163,.85);padding:4px 8px;border-radius:6px;z-index:5;pointer-events:none}
.dbox{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:22px 24px;margin-top:18px}
.dbox h1{font-size:22px}
.dbox .body{white-space:pre-wrap;font-size:14.5px;color:var(--text);margin-top:14px;line-height:1.75}
.side{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:18px 20px}
.side h2{font-size:15px}
.side .row{display:flex;gap:12px;padding:10px 0;border-top:1px solid var(--line);cursor:pointer}
.side .row:first-of-type{border-top:0}
.side .row .th{width:92px;aspect-ratio:16/9;border-radius:6px;flex:none;position:relative;overflow:hidden}
.side .row .th::after{content:"";position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);border-left:10px solid #fff;border-top:6px solid transparent;border-bottom:6px solid transparent;opacity:.9}
.side .row b{font-size:13.5px;line-height:1.4;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;color:var(--ink)}
.side .row span{font-size:12px;color:var(--muted)}
.kv{display:grid;grid-template-columns:auto 1fr;gap:6px 14px;font-size:13.5px;margin-top:12px}
.kv b{color:var(--muted);font-weight:600}
.back{display:inline-flex;align-items:center;gap:6px;font-size:13.5px;font-weight:700;color:var(--muted);margin-bottom:14px}
.back:hover{color:var(--brand)}

/* ── viewer modal ── */
.viewer{position:fixed;inset:0;z-index:100;background:rgba(10,16,28,.94);display:flex;flex-direction:column}
.viewer .vh{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:12px 18px;color:#fff;background:rgba(0,0,0,.35)}
.viewer .vh b{font-size:15px}.viewer .vh span{font-size:12.5px;opacity:.7;margin-left:10px}
.viewer .vh .acts{display:flex;gap:8px}
.viewer .vb{flex:1;overflow:auto;padding:22px;position:relative;display:flex;flex-direction:column;align-items:center;gap:16px}
.viewer canvas,.viewer .pg img{max-width:min(920px,100%);background:#fff;border-radius:4px;box-shadow:0 10px 40px rgba(0,0,0,.5);display:block}
.viewer .pg img{width:min(920px,calc(100vw - 48px));height:auto}
.viewer .pg{position:relative}
.viewer .pg .wmt{position:absolute;inset:0;pointer-events:none;overflow:hidden;display:grid;grid-template-columns:repeat(3,1fr);grid-auto-rows:120px;align-content:start;padding-top:40px}
.viewer .pg .wmt span{transform:rotate(-24deg);font-size:13px;font-weight:800;color:rgba(12,60,92,.13);white-space:nowrap;justify-self:center;align-self:center}
.viewer .pgno{color:rgba(255,255,255,.5);font-size:12px}
.viewer .msg{color:#fff;opacity:.8;font-size:14px;padding:40px}
.noselect{-webkit-user-select:none;user-select:none}

/* ── auth ── */
.auth{min-height:calc(100vh - 66px);display:grid;grid-template-columns:1fr 1fr}
.auth .art{background:linear-gradient(160deg,var(--brand),#1a8f8a);color:#fff;padding:64px 56px;display:flex;flex-direction:column;justify-content:space-between;position:relative;overflow:hidden}
.auth .art::before{content:"";position:absolute;right:-120px;bottom:-120px;width:420px;height:420px;border-radius:50%;background:rgba(255,255,255,.07)}
.auth .art h1{color:#fff;font-size:32px;line-height:1.3;max-width:420px}
.auth .art p{opacity:.88;max-width:420px;font-size:15px}
.auth .art ul{list-style:none;padding:0;margin:26px 0 0;display:grid;gap:10px;font-size:14px}
.auth .art li::before{content:"✓";display:inline-block;width:20px;color:#9ff0e6;font-weight:900}
.auth .art .demo{font-size:12.5px;opacity:.85;background:rgba(0,0,0,.18);border-radius:10px;padding:12px 14px;line-height:1.7}
.auth .art .demo code{background:rgba(255,255,255,.15);padding:1px 6px;border-radius:4px;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:12px}
.auth .form{padding:64px 56px;display:flex;align-items:center;justify-content:center}
.form-card{width:100%;max-width:420px}
.form-card h2{font-size:24px;margin-bottom:6px}
.form-card .sub{color:var(--muted);font-size:14px;margin:0 0 24px}
label{display:block;font-size:13px;font-weight:700;margin:14px 0 6px;color:var(--ink)}
label small{font-weight:500;color:var(--muted);margin-left:6px}
.in{width:100%;padding:12px 14px;border:1.5px solid var(--line);border-radius:10px;font-size:15px;background:#fff}
.in:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px rgba(25,179,163,.15)}
.in.err{border-color:var(--ng)}
.hint{font-size:12.5px;color:var(--muted);margin-top:6px}
.hint.ok{color:var(--ok)}.hint.ng{color:var(--ng)}
.seg{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.seg button{padding:12px;border:1.5px solid var(--line);background:#fff;border-radius:10px;text-align:left;font-size:13.5px}
.seg button b{display:block;font-size:14px;color:var(--ink);margin-bottom:2px}
.seg button small{color:var(--muted);font-size:12px;line-height:1.4;display:block}
.seg button.on{border-color:var(--accent);background:var(--accent-soft)}
.alert{border-radius:10px;padding:12px 14px;font-size:13.5px;margin-top:14px;border:1.5px solid var(--line);background:#fff}
.alert.ng{border-color:#f3c4bf;background:#fdf2f0;color:var(--ng)}
.alert.ok{border-color:#bfe6cf;background:#f0faf4;color:var(--ok)}
.alert.wait{border-color:#f1e2a6;background:#fffbe8;color:var(--wait)}
.form-card .foot{margin-top:18px;font-size:13.5px;color:var(--muted);text-align:center}
.form-card .foot a{color:var(--accent);font-weight:700}
.status-card{max-width:520px;margin:60px auto;background:#fff;border:1px solid var(--line);border-radius:18px;padding:36px;text-align:center}
.status-card .ic{width:64px;height:64px;border-radius:50%;margin:0 auto 16px;display:flex;align-items:center;justify-content:center;font-size:28px;background:#fffbe8}
.status-card h2{font-size:22px}
.status-card p{color:var(--muted);font-size:14.5px}
.steps{display:flex;justify-content:center;gap:0;margin:22px 0;font-size:12.5px;font-weight:700;color:var(--muted)}
.steps div{padding:8px 14px;border:1.5px solid var(--line);background:#fff}
.steps div:first-child{border-radius:999px 0 0 999px}.steps div:last-child{border-radius:0 999px 999px 0}
.steps div.on{background:var(--brand);color:#fff;border-color:var(--brand)}
.steps div.done{background:var(--accent-soft);color:var(--brand)}

/* misc */
.empty{padding:48px;text-align:center;color:var(--muted);background:#fff;border:1px dashed var(--line);border-radius:var(--r)}
footer{padding:26px 0;border-top:1px solid var(--line);font-size:12.5px;color:var(--muted)}
footer .wrap{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap}
.toast{position:fixed;left:50%;bottom:28px;transform:translateX(-50%);background:var(--ink);color:#fff;padding:11px 18px;border-radius:10px;font-size:13.5px;z-index:200;box-shadow:0 10px 30px rgba(0,0,0,.25)}
.demo-bar{background:#fff8e6;border-bottom:1px solid #f1e2a6;font-size:12.5px;color:#6b5300;text-align:center;padding:6px 12px}
.demo-bar a{font-weight:800;color:#8a6318;text-decoration:underline}

@media (max-width:980px){
  .grid{grid-template-columns:repeat(2,1fr)}
  .detail{grid-template-columns:1fr}
  .hero{grid-template-columns:1fr;padding:30px 26px}
  .auth{grid-template-columns:1fr}.auth .art{display:none}.auth .form{padding:36px 22px}
}
@media (max-width:640px){
  .wrap{padding:0 16px}
  .menu{display:none}
  .me .who{display:none}
  .grid,.grid.two{grid-template-columns:1fr}
  .sem{grid-template-columns:1fr;gap:12px}.sem .date{border-right:0;padding:0;text-align:left;display:flex;gap:10px;align-items:baseline}
  .search{margin-left:0;width:100%}.search input{width:100%}
  .page{padding:22px 0 90px}
  h1{font-size:22px}
  .mobile-tabs{display:flex;position:fixed;left:0;right:0;bottom:0;background:#fff;border-top:1px solid var(--line);z-index:40;padding:6px 6px calc(6px + env(safe-area-inset-bottom))}
  .mobile-tabs a{flex:1;text-align:center;font-size:11px;font-weight:700;color:var(--muted);padding:6px 0}
  .mobile-tabs a.on{color:var(--brand)}
  .mobile-tabs a i{display:block;font-style:normal;font-size:18px;margin-bottom:2px}
  .hero h1{font-size:24px}
  .viewer .vb{padding:12px}
  .logo small{display:none}
  .player .secure{display:none}
  .wm{font-size:10px;padding:3px 6px}
}