:root{
  --peach:#ffb3a7;
  --peach-strong:#ff9c8d;
  --text:#222;
  --muted:#666;
  --line:#e9e9e9;
  --bg:#ffffff;
  --danger:#e54848;
}

*{box-sizing:border-box;}
html,body{margin:0;padding:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Noto Sans KR","Apple SD Gothic Neo",Segoe UI,Roboto,Helvetica,Arial,sans-serif;}

.container{max-width:1080px;margin:0 auto;padding:20px;}

.header{display:flex;align-items:center;gap:12px;margin-bottom:12px;}
.logo{width:80px;height: 80px;border-radius:12px;display:flex;align-items:center;justify-content:center}
.logo img{width:100%;height:100%;object-fit:contain;border-radius:12px}
.brand{display:flex;flex-direction:column;}
.brand .title{font-weight:800;font-size:20px;line-height:1.1;}
.brand .slogan{font-size:12px;color:#444;}

.backbar{margin:8px 0 16px 0;}
.backbar a{
  text-decoration:none; color:#333; font-size:14px;
  display:inline-flex; align-items:center; gap:6px; padding:6px 10px;
  border-radius:8px; border:1px solid var(--line); background:#fff;
}
.backbar a:hover{background:#fafafa;}

h1{font-size:22px;margin:10px 0 14px 0;}
.section{margin-top:14px;}

/* Subject grouped lists on index */
.subject-list {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 12px;
}
.subject-list li a {
  display: block;
  text-decoration: none;
  border: 1px solid #eee;
  padding: 14px;
  border-radius: 10px;
  background: #fff;
  color: #222;
  font-weight: 600;
  text-align: center;
}
.subject-list li a:hover {
  background: #fff6f3;
  border-color: #ffd3cb;
}
h2 {
  margin-top: 28px;
  margin-bottom: 8px;
  color: #e45b3a;
  font-size: 18px;
}

/* Table (PC) */
.table-wrap{overflow-x:auto;background:#fff;border:1px solid var(--line);border-radius:12px;}
table{width:100%;border-collapse:collapse;min-width:720px;}
thead th{
  text-align:center;background:#fafafa;border-bottom:1px solid var(--line);
  font-weight:700;padding:12px 10px;font-size:14px;
}
tbody td{
  border-bottom:1px solid var(--line);padding:12px 10px;text-align:center;font-size:14px;
}
tbody tr:hover{background:#fff8f6;}

/* Icons */
.play-btn{
  width:32px;height:32px;border-radius:999px;border:2px solid #bbb;display:inline-flex;align-items:center;justify-content:center;
}
.play-btn svg{width:14px;height:14px;}
.doc-icon{font-size:18px;}

/* Desktop/Mobile switch */
.desktop-table{display:block;}
.mobile-cards{display:none;}
@media (max-width:768px){
  .container{padding:12px;}
  .desktop-table{display:none;}
  .mobile-cards{display:block;}
}

/* Mobile card look */
@media (max-width: 768px){
  .table-wrap{border:none;background:transparent;}
  table, thead, tbody, th, td, tr{display:block;}
  thead{display:none;}
  table{min-width:0;}
  tbody tr{
    border:1px solid var(--line);border-radius:12px;margin-bottom:12px;background:#fff;
    padding:10px 12px; box-shadow:0 2px 6px rgba(0,0,0,.04);
  }
  tbody td{border:none;padding:4px 0;text-align:left;font-size:15px;}
  tbody td[data-col="top"]{
    display:flex;align-items:center;justify-content:space-between;
    font-weight:800;font-size:16px;margin-bottom:2px;
  }
  .top-left{display:flex;align-items:center;gap:8px;min-width:0;}
  .no-badge{display:inline-block;min-width:28px;text-align:center;padding:2px 6px;border-radius:8px;background:#fff0ec;color:#e45b3a;font-weight:800;}
  .lecture-title{white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width: calc(100vw - 160px);}
  .top-right{display:flex;align-items:center;gap:8px;}
  tbody td[data-col="bottom"]{color:var(--muted);font-size:14px;display:flex;align-items:center;gap:8px;}
  .sep{opacity:.5;}
}

/* Password Modal */
.lock-mask{
  position:fixed;inset:0;background:rgba(0,0,0,.35);
  display:flex;align-items:center;justify-content:center;z-index:9999;
}
.lock-card{
  width:min(92vw, 420px);background:#fff;border-radius:16px;
  box-shadow:0 10px 30px rgba(0,0,0,.18);
  padding:18px 18px 16px 18px;border:1px solid #f1f1f1;
}
.lock-title{
  display:flex;align-items:center;gap:8px;font-weight:800;
  margin:4px 0 10px 0;font-size:18px;
}
.lock-body{display:flex;flex-direction:column;gap:10px;}
.lock-input{
  padding:11px 12px;border:1px solid #e8e8e8;border-radius:10px;font-size:16px;outline:none;
}
.lock-input:focus{border-color:#ffd3cb;box-shadow:0 0 0 3px #fff1ee;}
.lock-actions{display:flex;gap:8px;justify-content:flex-end;margin-top:6px;}
.btn{
  padding:10px 14px;border-radius:10px;border:1px solid #eee;background:#fff;font-weight:700;cursor:pointer;
}
.btn-primary{background:var(--peach);border-color:var(--peach-strong);color:#fff;}
.btn:hover{filter:brightness(.98);}
.lock-error{color:var(--danger);font-size:13px;min-height:16px;}