/* ══════════════════════════════
   변수
══════════════════════════════ */
:root {
  --primary:       #f8fafc;
  --card-bg:       #ffffff;
  --accent:        #2563eb;
  --accent-hover:  #1d4ed8;
  --accent2:       #059669;
  --text:          #1e293b;
  --text-muted:    #64748b;
  --border:        rgba(0,0,0,0.08);
  --nav-bg:        rgba(10,22,40,0.95);
  --nav-scrolled:  rgba(10,22,40,0.98);
  --dark-bg:       #0a1628;
  --dark-accent:   #00c8ff;
  --dark-accent2:  #00ff9d;
  --dark-muted:    #8a9bb5;
  --dark-border:   rgba(0,200,255,0.15);
  --badge-recom:   #e67e22;
  --badge-pop:     #e74c3c;
}

/* ══════════════════════════════
   리셋 & 기본
══════════════════════════════ */
*, *::before, *::after { margin:0; padding:0; box-sizing:border-box; }
html { scroll-behavior:smooth; }
body { font-family:'Noto Sans KR',sans-serif; background:var(--primary); color:var(--text); overflow-x:hidden; }
a { text-decoration:none; color:inherit; }
::-webkit-scrollbar { width:6px; }
::-webkit-scrollbar-track { background:var(--primary); }
::-webkit-scrollbar-thumb { background:var(--dark-accent); border-radius:3px; }

/* ══════════════════════════════
   NAV
══════════════════════════════ */
nav {
  position:fixed; top:0; left:0; right:0; z-index:1000;
  padding:0 40px; height:90px;
  display:flex; align-items:center; justify-content:space-between;
  background:var(--nav-bg); backdrop-filter:blur(20px);
  border-bottom:1px solid var(--dark-border); transition:all 0.3s;
}
nav.scrolled { height:80px; background:var(--nav-scrolled); box-shadow:0 4px 20px rgba(0,0,0,0.3); border-color:transparent; }
.nav-logo,.footer-logo {
  display:inline-flex; align-items:baseline;
  font-family:'Bebas Neue',sans-serif; font-size:2.2rem; letter-spacing:1px;
  color:var(--dark-accent); text-transform:lowercase; transition:all 0.3s;
}
.footer-logo { font-size:1.6rem; }
.en-edu { color:var(--dark-accent2); margin-left:2px; }
.ko-text {
  font-family:'Noto Sans KR',sans-serif; font-size:1.15rem; font-weight:700;
  letter-spacing:-0.5px; margin-left:10px; text-transform:none;
  background:linear-gradient(135deg,#fff 0%,var(--dark-muted) 100%);
  -webkit-background-clip:text; -webkit-text-fill-color:transparent; opacity:0.85;
}
.footer-logo .ko-text { font-size:0.85rem; }
.nav-links { display:flex; gap:24px; list-style:none; }
.nav-links > li { position:relative; padding:30px 0; }
.nav-links a { font-size:1.05rem; font-weight:700; color:var(--dark-muted); padding:4px 8px; transition:color 0.2s; }
.nav-links a:hover,.nav-links a.active { color:var(--dark-accent); }
.sub-menu {
  position:absolute; top:100%; left:50%; transform:translateX(-50%) translateY(10px);
  background:var(--nav-scrolled); min-width:150px; text-align:center;
  list-style:none; padding:10px 0; border-radius:8px;
  box-shadow:0 10px 25px rgba(0,0,0,0.3); border:1px solid var(--dark-border);
  opacity:0; visibility:hidden; transition:all 0.3s;
}
.nav-links > li:hover .sub-menu { opacity:1; visibility:visible; transform:translateX(-50%) translateY(-10px); }
.sub-menu a { display:block; padding:12px 20px; font-size:0.95rem; font-weight:500; color:var(--dark-muted); }
.sub-menu a:hover { color:var(--dark-accent); background:rgba(0,200,255,0.05); }
.nav-toggle { display:none; flex-direction:column; gap:5px; cursor:pointer; background:none; border:none; }
.nav-toggle span { width:24px; height:2px; background:var(--dark-accent); display:block; }
.user-menu { display:flex; gap:12px; align-items:center; }
.btn-login { padding:8px 18px; border:1px solid var(--dark-accent); background:transparent; color:var(--dark-accent); border-radius:24px; font-size:0.9rem; font-weight:600; transition:0.3s; }
.btn-login:hover { background:rgba(0,200,255,0.1); }

/* ══════════════════════════════
   페이지 헤더
══════════════════════════════ */
.page-header {
  padding:140px 40px 70px;
  background:linear-gradient(135deg,var(--dark-bg) 0%,#0f2442 100%);
  text-align:center; position:relative; overflow:hidden;
}
.page-header::before {
  content:''; position:absolute; inset:0;
  background-image:linear-gradient(rgba(0,200,255,0.05) 1px,transparent 1px),
                   linear-gradient(90deg,rgba(0,200,255,0.05) 1px,transparent 1px);
  background-size:40px 40px; z-index:1; opacity:0.5;
}
.page-header-content { position:relative; z-index:2; animation:fadeInUp 0.8s ease both; }
.page-title { font-size:2.6rem; font-weight:700; color:#fff; margin-bottom:12px; letter-spacing:-1px; }
.page-subtitle { font-size:1.1rem; color:var(--dark-muted); font-weight:300; }

/* ══════════════════════════════
   섹션
══════════════════════════════ */
.course-list-section { padding:50px 40px 100px; max-width:1280px; margin:0 auto; }

/* ── 컨트롤 바 ── */
.course-controls {
  display:flex; justify-content:space-between; align-items:center;
  flex-wrap:wrap; gap:16px; margin-bottom:20px;
  animation:fadeInUp 0.6s 0.1s ease both;
}
.filter-tabs { display:flex; gap:8px; flex-wrap:wrap; }
.filter-btn {
  display:inline-block; padding:8px 18px; border-radius:24px;
  border:1px solid var(--border); background:var(--card-bg);
  color:var(--text-muted); font-size:0.9rem; font-weight:600;
  cursor:pointer; transition:all 0.25s; white-space:nowrap;
}
.filter-btn:hover { border-color:var(--accent); color:var(--accent); }
.filter-btn.active { background:var(--accent); color:#fff; border-color:var(--accent); box-shadow:0 4px 12px rgba(37,99,235,0.25); }
.badge-recom-btn.active { background:var(--badge-recom); border-color:var(--badge-recom); }
.badge-pop-btn.active   { background:var(--badge-pop);   border-color:var(--badge-pop); }
.filter-btn-reset { border-style:dashed; color:#94a3b8; border-color:#cbd5e1; }
.filter-btn-reset:hover { border-color:var(--badge-pop); color:var(--badge-pop); background:rgba(231,76,60,0.06); }

.search-sort-group { display:flex; gap:8px; align-items:center; }
.sort-select {
  padding:9px 14px; border:1px solid var(--border); border-radius:6px;
  background:#fff; font-size:0.9rem; color:var(--text); outline:none; cursor:pointer;
}
.search-box {
  display:flex; border:1px solid var(--border); border-radius:6px;
  overflow:hidden; background:#fff;
}
.search-box input { border:none; padding:9px 14px; width:200px; outline:none; font-size:0.9rem; }
.search-box button { background:var(--accent); border:none; padding:0 16px; cursor:pointer; color:#fff; font-weight:700; font-size:0.88rem; transition:0.2s; white-space:nowrap; }
.search-box button:hover { background:var(--accent-hover); }
.search-clear { display:flex; align-items:center; padding:0 10px; color:var(--text-muted); font-size:0.9rem; transition:0.2s; }
.search-clear:hover { color:var(--badge-pop); }

/* 결과 수 */
.result-info { font-size:0.88rem; color:var(--text-muted); margin-bottom:24px; }
.result-info strong { color:var(--accent); font-weight:700; }
.result-kw { color:var(--accent); }

/* ══════════════════════════════
   과정 카드 그리드
══════════════════════════════ */
.course-grid {
  display:grid;
  grid-template-columns:repeat(auto-fill, minmax(270px,1fr));
  gap:22px;
  animation:fadeInUp 0.6s 0.2s ease both;
}
.course-card {
  background:var(--card-bg); border:1px solid var(--border);
  border-radius:14px; overflow:hidden;
  display:flex; flex-direction:column;
  transition:transform 0.25s, box-shadow 0.25s, border-color 0.25s;
  cursor:pointer; box-shadow:0 2px 10px rgba(0,0,0,0.04);
}
.course-card:hover {
  transform:translateY(-6px);
  border-color:rgba(37,99,235,0.25);
  box-shadow:0 12px 28px rgba(0,0,0,0.09);
}

/* 썸네일 */
.course-thumb {
  height:165px; background:#e2e8f0;
  position:relative; overflow:hidden;
}
.course-thumb img { width:100%; height:100%; object-fit:cover; transition:transform 0.35s; }
.course-card:hover .course-thumb img { transform:scale(1.04); }
.thumb-empty {
  width:100%; height:100%; display:flex; align-items:center;
  justify-content:center; font-size:2.5rem; background:#f1f5f9; color:#94a3b8;
}
.play-btn-overlay {
  position:absolute; inset:0; display:flex; align-items:center; justify-content:center;
  background:rgba(0,0,0,0.28); opacity:0; transition:opacity 0.25s;
}
.course-card:hover .play-btn-overlay { opacity:1; }
.play-btn-overlay .icon {
  width:50px; height:50px; background:rgba(255,255,255,0.95);
  color:var(--accent); border-radius:50%;
  display:flex; align-items:center; justify-content:center;
  font-size:1.1rem; padding-left:3px;
  box-shadow:0 4px 16px rgba(0,0,0,0.2);
}

/* 썸네일 뱃지 */
.thumb-badges { position:absolute; top:10px; left:10px; display:flex; flex-direction:column; gap:4px; }
.tbadge {
  display:inline-block; padding:3px 9px; border-radius:20px;
  font-size:0.72rem; font-weight:700; line-height:1.5; white-space:nowrap;
}
.tbadge-recom { background:var(--badge-recom); color:#fff; }
.tbadge-pop   { background:var(--badge-pop);   color:#fff; }

/* 카드 정보 */
.course-info { padding:18px 20px; flex:1; display:flex; flex-direction:column; gap:8px; }
.course-tag {
  display:inline-block; padding:3px 9px; border-radius:4px;
  font-size:0.72rem; font-weight:700;
  background:rgba(37,99,235,0.1); color:var(--accent);
  align-self:flex-start;
}
.course-title {
  font-size:1rem; font-weight:700; line-height:1.45;
  color:var(--text); word-break:keep-all;
  display:-webkit-box; -webkit-line-clamp:2; -webkit-box-orient:vertical; overflow:hidden;
}
.course-meta-sub { font-size:0.82rem; color:var(--text-muted); }

/* 카드 하단 */
.course-footer {
  display:flex; align-items:center; justify-content:space-between;
  border-top:1px solid var(--border); padding-top:12px; margin-top:auto;
}
.price { font-size:1rem; font-weight:700; color:var(--text); }
.price.free { color:var(--accent2); }

/* 카드 하단 뱃지 */
.course-badges { display:flex; gap:4px; }
.cbadge {
  display:inline-block; padding:2px 8px; border-radius:12px;
  font-size:0.7rem; font-weight:700;
}
.cbadge-recom { background:rgba(230,126,34,0.12); color:var(--badge-recom); }
.cbadge-pop   { background:rgba(231,76,60,0.12);  color:var(--badge-pop); }

/* 빈 결과 */
.empty-courses { text-align:center; padding:80px 20px; color:var(--text-muted); }
.empty-courses .empty-icon { font-size:3rem; margin-bottom:14px; }
.empty-courses p { font-size:1rem; }

/* ══════════════════════════════
   페이징
══════════════════════════════ */
.pagination {
  display:flex; justify-content:center; gap:6px;
  margin-top:56px; flex-wrap:wrap;
  animation:fadeInUp 0.6s 0.3s ease both;
}
.page-btn {
  min-width:40px; height:40px; display:inline-flex; align-items:center; justify-content:center;
  border:1px solid var(--border); border-radius:8px; background:var(--card-bg);
  color:var(--text-muted); font-size:0.88rem; font-weight:600; transition:all 0.2s;
}
.page-btn:hover { border-color:var(--accent); color:var(--accent); }
.page-btn.active { background:var(--accent); color:#fff; border-color:var(--accent); box-shadow:0 4px 10px rgba(37,99,235,0.2); }
.page-btn.wide { padding:0 16px; }

/* ══════════════════════════════
   푸터 / 플로팅
══════════════════════════════ */
footer {
  border-top:1px solid var(--dark-border); padding:36px 40px;
  display:flex; justify-content:space-between; align-items:center;
  flex-wrap:wrap; gap:16px; background:var(--dark-bg);
}
.footer-copy { font-size:0.85rem; color:var(--dark-muted); }
.floating-menu { position:fixed; right:28px; bottom:36px; z-index:999; }
.btn-floating {
  display:flex; align-items:center; gap:8px;
  background:var(--dark-bg); color:var(--dark-accent);
  padding:14px 22px; border-radius:40px; font-weight:700; font-size:1rem;
  box-shadow:0 8px 24px rgba(10,22,40,0.3); border:1px solid var(--dark-border);
  transition:all 0.3s;
}
.btn-floating:hover { transform:translateY(-4px); background:#11284d; }

/* ══════════════════════════════
   애니메이션
══════════════════════════════ */
@keyframes fadeInUp { from { opacity:0; transform:translateY(24px); } to { opacity:1; transform:translateY(0); } }

/* ══════════════════════════════
   반응형
══════════════════════════════ */
@media(max-width:1024px) {
  .course-grid { grid-template-columns:repeat(auto-fill, minmax(240px,1fr)); gap:18px; }
}
@media(max-width:900px) {
  nav { padding:0 20px; }
  .nav-links { display:none; flex-direction:column; position:absolute; top:80px; left:0; right:0; background:var(--nav-scrolled); padding:20px; border-bottom:1px solid var(--dark-border); }
  .nav-links.open { display:flex; }
  .nav-links > li { padding:10px 0; }
  .sub-menu { position:static; transform:none; opacity:1; visibility:visible; box-shadow:none; border:none; background:rgba(0,0,0,0.2); display:none; }
  .nav-toggle { display:flex; }
  .page-header { padding:110px 20px 50px; }
  .course-list-section { padding:36px 16px 80px; }
  .course-controls { flex-direction:column; align-items:stretch; }
  .search-sort-group { flex-direction:column; }
  .search-box input { width:100%; }
  .course-grid { grid-template-columns:repeat(2,1fr); gap:14px; }
  .floating-menu { right:16px; bottom:20px; }
}
@media(max-width:520px) {
  .course-grid { grid-template-columns:1fr; }
  .page-title { font-size:2rem; }
}