/* 456에듀 공통 지면 — index / login / lectures 세 지면이 함께 쓴다. */
:root{
  --ink:#131A22;
  --ink-2:#3D4A58;
  --ink-3:#6B7885;
  --brand:#16324F;
  --brand-2:#22496F;
  --brand-wash:#EEF2F7;
  --accent:#9A6B24;
  --accent-wash:#FBF4E7;
  --paper:#FFFFFF;
  --paper-2:#F7F8FA;
  --line:#DFE4EA;
  --line-2:#EBEEF2;
  --radius:10px;
  --shadow:0 1px 2px rgba(19,26,34,.05), 0 8px 24px -12px rgba(19,26,34,.14);
  --max:960px;
  --font:"Pretendard Variable", Pretendard, -apple-system, BlinkMacSystemFont, system-ui, "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0; background:var(--paper); color:var(--ink);
  font-family:var(--font); font-size:17px; line-height:1.75;
  letter-spacing:-.01em; word-break:keep-all;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--brand-2)}
.wrap{max-width:var(--max); margin:0 auto; padding:0 24px}

/* ── 머리 ─────────────────────────────── */
.site-head{
  border-bottom:1px solid var(--line); background:var(--paper);
  position:sticky; top:0; z-index:10;
  backdrop-filter:saturate(140%) blur(8px);
}
.site-head .wrap{display:flex; align-items:center; justify-content:space-between; gap:16px; height:66px}
.brand{display:flex; align-items:baseline; gap:9px; text-decoration:none; color:inherit}
.brand-mark{
  font-weight:800; font-size:20px; letter-spacing:-.03em; color:var(--brand);
  font-variant-numeric:tabular-nums;
}
.brand-word{font-weight:650; font-size:17px; color:var(--ink)}
.brand-sub{font-size:12.5px; color:var(--ink-3); letter-spacing:.02em}
.nav{display:flex; gap:22px; font-size:14.5px}
.nav a{color:var(--ink-2); text-decoration:none; padding:4px 0; border-bottom:1.5px solid transparent}
.nav a:hover{color:var(--brand); border-bottom-color:var(--brand)}
.nav a:focus-visible{outline:2px solid var(--brand); outline-offset:3px; border-radius:3px}

/* ── 첫 화면 ───────────────────────────── */
.hero{padding:78px 0 66px; background:linear-gradient(180deg,var(--brand-wash) 0%, var(--paper) 100%)}
.eyebrow{
  display:inline-block; font-size:12.5px; font-weight:600; letter-spacing:.09em;
  color:var(--accent); background:var(--accent-wash);
  padding:5px 11px; border-radius:100px; margin-bottom:20px;
}
.hero h1{
  margin:0 0 20px; font-size:clamp(30px,5.2vw,46px); line-height:1.28;
  font-weight:800; letter-spacing:-.035em; text-wrap:balance; color:var(--brand);
}
.hero p{margin:0; max-width:44ch; font-size:18px; color:var(--ink-2)}

/* ── 본문 ─────────────────────────────── */
section{padding:60px 0; border-top:1px solid var(--line-2)}
section:first-of-type{border-top:0}
h2{
  margin:0 0 8px; font-size:13px; font-weight:700; letter-spacing:.11em;
  color:var(--accent); text-transform:uppercase;
}
h2 + .h2ko{margin:0 0 30px; font-size:26px; font-weight:750; letter-spacing:-.03em; color:var(--brand)}
h3{margin:0 0 8px; font-size:17.5px; font-weight:700; letter-spacing:-.02em}
p{margin:0 0 16px; color:var(--ink-2)}
p:last-child{margin-bottom:0}

.grid{display:grid; gap:18px; grid-template-columns:repeat(auto-fit,minmax(248px,1fr))}
.card{
  background:var(--paper); border:1px solid var(--line);
  border-radius:var(--radius); padding:24px 22px; box-shadow:var(--shadow);
}
.card p{font-size:15.5px; margin:0; color:var(--ink-3)}

.tablewrap{overflow-x:auto; -webkit-overflow-scrolling:touch}
table{width:100%; border-collapse:collapse; font-size:15.5px; min-width:460px}
caption{text-align:left; font-size:14px; color:var(--ink-3); padding-bottom:10px}
th,td{padding:13px 14px; text-align:left; border-bottom:1px solid var(--line-2); vertical-align:top}
thead th{
  font-size:12.5px; font-weight:700; letter-spacing:.05em; color:var(--ink-3);
  background:var(--paper-2); border-bottom:1px solid var(--line);
}
td.num{font-variant-numeric:tabular-nums; white-space:nowrap}
tbody tr:last-child td{border-bottom:0}

.pending{
  display:inline-block; font-size:12.5px; font-weight:600; color:var(--accent);
  background:var(--accent-wash); padding:3px 9px; border-radius:5px;
}
.note{
  margin-top:20px; padding:16px 18px; background:var(--paper-2);
  border-left:3px solid var(--brand); border-radius:0 var(--radius) var(--radius) 0;
  font-size:14.5px; color:var(--ink-2);
}
.note p{font-size:14.5px}
ol.refund{margin:0; padding-left:1.3em; font-size:15.5px; color:var(--ink-2)}
ol.refund li{margin-bottom:9px}
ol.refund li:last-child{margin-bottom:0}

/* ── 꼬리 ─────────────────────────────── */
.site-foot{
  border-top:1px solid var(--line); background:var(--paper-2);
  padding:44px 0 52px; font-size:14.5px; color:var(--ink-3);
}
.foot-name{font-weight:700; color:var(--ink); font-size:16px; margin-bottom:12px}
.foot-list{margin:0; padding:0; list-style:none; line-height:2}
.foot-list dt{display:inline; font-weight:600; color:var(--ink-2)}
.foot-list dd{display:inline; margin:0}
.foot-row{margin:0}
.foot-row .label{
  display:inline-block; min-width:74px; font-weight:600; color:var(--ink-2);
}
.copyright{margin-top:24px; padding-top:20px; border-top:1px solid var(--line); font-size:13.5px}

@media (max-width:640px){
  body{font-size:16px}
  .site-head .wrap{height:60px}
  .nav{gap:14px; font-size:13.5px}
  .brand-sub{display:none}
  .hero{padding:56px 0 48px}
  section{padding:48px 0}
  .foot-row .label{display:block; min-width:0}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none !important; transition:none !important}
}

/* ── 로그인 · 강의 지면 추가분 ─────────────────── */
.nav .nav-cta{
  color:var(--paper); background:var(--brand); border:1px solid var(--brand);
  padding:7px 15px; border-radius:7px; font-weight:600; border-bottom:0;
}
.nav .nav-cta:hover{background:var(--brand-2); border-color:var(--brand-2); color:var(--paper); border-bottom-color:transparent}

.center-pane{
  min-height:calc(100vh - 66px); display:flex; align-items:center; justify-content:center;
  padding:48px 24px; background:linear-gradient(180deg,var(--brand-wash) 0%,var(--paper) 60%);
}
.auth-card{
  width:100%; max-width:392px; background:var(--paper); border:1px solid var(--line);
  border-radius:14px; padding:38px 34px; box-shadow:var(--shadow);
}
.auth-card h1{margin:0 0 8px; font-size:23px; font-weight:750; letter-spacing:-.03em; color:var(--brand)}
.auth-card .sub{margin:0 0 26px; font-size:15px; color:var(--ink-3)}
label{display:block; font-size:13.5px; font-weight:650; color:var(--ink-2); margin-bottom:7px}
input[type=password],input[type=text]{
  width:100%; font:inherit; font-size:16px; padding:12px 14px;
  border:1px solid var(--line); border-radius:8px; background:var(--paper-2); color:var(--ink);
  letter-spacing:.04em;
}
input:focus{outline:2px solid var(--brand); outline-offset:1px; background:var(--paper)}
.btn{
  width:100%; margin-top:16px; font:inherit; font-size:16px; font-weight:650;
  padding:13px 16px; border:0; border-radius:8px; cursor:pointer;
  background:var(--brand); color:var(--paper);
}
.btn:hover{background:var(--brand-2)}
.btn:disabled{opacity:.55; cursor:progress}
.btn:focus-visible{outline:2px solid var(--accent); outline-offset:2px}
.formmsg{margin-top:14px; font-size:14px; min-height:1.4em}
.formmsg[data-tone=error]{color:#A32C2C}
.formmsg[data-tone=ok]{color:#1F6B3B}

.course{border:1px solid var(--line); border-radius:var(--radius); overflow:hidden; margin-bottom:18px; background:var(--paper)}
.course > summary{
  list-style:none; cursor:pointer; padding:20px 22px; background:var(--paper-2);
  display:flex; align-items:baseline; gap:12px; flex-wrap:wrap;
}
.course > summary::-webkit-details-marker{display:none}
.course > summary:focus-visible{outline:2px solid var(--brand); outline-offset:-2px}
.course-name{font-size:18px; font-weight:700; letter-spacing:-.02em; color:var(--brand)}
.course-for{font-size:13.5px; color:var(--ink-3)}
.course-count{margin-left:auto; font-size:13px; color:var(--ink-3); font-variant-numeric:tabular-nums}
.course-desc{margin:0; padding:16px 22px 4px; font-size:15px; color:var(--ink-2)}
.lesson-list{list-style:none; margin:0; padding:8px 12px 16px}
.lesson{
  display:flex; align-items:center; gap:14px; width:100%; text-align:left;
  font:inherit; background:none; border:0; cursor:pointer;
  padding:13px 10px; border-radius:8px; color:inherit;
}
.lesson:hover{background:var(--brand-wash)}
.lesson:focus-visible{outline:2px solid var(--brand); outline-offset:-2px}
.lesson[disabled]{cursor:not-allowed; opacity:.55}
.lesson-no{
  flex:0 0 auto; width:30px; height:30px; border-radius:50%;
  background:var(--brand); color:var(--paper); font-size:13px; font-weight:700;
  display:grid; place-items:center; font-variant-numeric:tabular-nums;
}
.lesson[disabled] .lesson-no{background:var(--ink-3)}
.lesson-title{flex:1 1 auto; font-size:15.5px; font-weight:600}
.lesson-min{flex:0 0 auto; font-size:13px; color:var(--ink-3); font-variant-numeric:tabular-nums}

dialog.player{
  border:0; border-radius:14px; padding:0; width:min(920px,94vw);
  background:var(--paper); box-shadow:0 24px 64px -16px rgba(19,26,34,.4);
}
dialog.player::backdrop{background:rgba(19,26,34,.62)}
.player-head{display:flex; align-items:center; gap:12px; padding:16px 20px; border-bottom:1px solid var(--line-2)}
.player-title{flex:1 1 auto; font-size:16px; font-weight:700; letter-spacing:-.02em; margin:0}
.player-close{font:inherit; font-size:14px; border:1px solid var(--line); background:var(--paper); border-radius:7px; padding:7px 13px; cursor:pointer}
.player-close:hover{background:var(--paper-2)}
.player-frame{aspect-ratio:16/9; width:100%; background:#000; border-radius:0 0 14px 14px; overflow:hidden}
.player-frame iframe{width:100%; height:100%; border:0; display:block}
.player-empty{
  aspect-ratio:16/9; display:grid; place-items:center; text-align:center;
  padding:24px; background:var(--paper-2); color:var(--ink-3); font-size:15px;
}