/* ============================================================
   미래역량AI연구소 학습 플랫폼 — components.css
   컴포넌트 스타일: 카드 · 배지 · 검색바 · 네비 · 모달 · 진도바 · 버튼
   ============================================================ */

/* ═══════════════════════════════════════════════════════════
   1. .nav-bar — 네비게이션 바
   ═══════════════════════════════════════════════════════════ */
.nav-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: #FFFFFF;
  border-bottom: 1px solid #E2E8F0;
  box-shadow: 0 2px 8px rgba(0,0,0,0.35);
  z-index: var(--z-sticky);
  transition: background var(--transition-normal), box-shadow var(--transition-normal);
}
.nav-bar.scrolled {
  background: #FFFFFF;
  box-shadow: 0 2px 12px rgba(0,0,0,0.08);
}

.nav-inner {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  height: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--space-4);
}
@media (min-width: 640px)  { .nav-inner { padding-inline: var(--space-6); } }
@media (min-width: 1024px) { .nav-inner { padding-inline: var(--space-8); } }

/* 로고 */
.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
  text-decoration: none;
}
.nav-logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
}
.nav-logo-text {
  font-size: var(--fs-sm);
  font-weight: var(--fw-bold);
  line-height: 1.2;
  white-space: nowrap;
  color: #0F172A;
}
.nav-logo-sub {
  font-size: var(--fs-xs);
  color: #64748B;
  font-weight: var(--fw-regular);
}

/* 카테고리 링크 (데스크탑) */
.nav-links {
  display: none;
  align-items: center;
  gap: var(--space-1);
  flex-shrink: 0;
}
@media (min-width: 1024px) { .nav-links { display: flex; } }

.nav-link {
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: #334155;
  transition: color var(--transition-fast), background var(--transition-fast);
  white-space: nowrap;
}
.nav-link:hover, .nav-link.active {
  color: #1D4ED8;
  background: #EEF2FF;
}
.nav-link.active { color: #1D4ED8; border-bottom: 2px solid #1D4ED8; }

/* 검색바 (nav 내) */
.nav-search {
  flex: 1;
  max-width: 400px;
  margin-inline: auto;
}
@media (max-width: 639px) { .nav-search { display: none; } }

/* 우측 액션 */
.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
  margin-left: auto;
}

/* 햄버거 버튼 */
.nav-hamburger {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-2);
  cursor: pointer;
  border-radius: var(--radius-md);
  transition: background var(--transition-fast);
}
@media (min-width: 1024px) { .nav-hamburger { display: none; } }
.nav-hamburger:hover { background: var(--bg-glass-light); }
.nav-hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: #CFD0D2;
  border-radius: 1px;
  transition: transform var(--transition-normal), opacity var(--transition-fast), background var(--transition-fast);
}
.nav-hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); background: var(--text-primary); }
.nav-hamburger.open span:nth-child(2) { opacity: 0; }
.nav-hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); background: var(--text-primary); }

/* 모바일 드로워 메뉴 */
.mobile-menu {
  position: fixed;
  top: var(--nav-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: #FFFFFF;
  border-right: 1.5px solid rgba(59,130,246,0.2);
  z-index: calc(var(--z-sticky) - 1);
  padding: var(--space-4);
  overflow-y: auto;
  transform: translateX(-100%);
  transition: transform var(--transition-normal);
}
.mobile-menu.open { transform: translateX(0); }

.mobile-menu-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid rgba(59,130,246,0.15);
  margin-bottom: var(--space-4);
}
.mobile-menu-link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-lg);
  font-size: var(--fs-base);
  color: #334155;
  transition: color var(--transition-fast), background var(--transition-fast);
}
.mobile-menu-link:hover, .mobile-menu-link.active {
  color: #0F172A;
  background: #EEF2FF;
}

/* ═══════════════════════════════════════════════════════════
   2. .search-bar — 검색 입력
   ═══════════════════════════════════════════════════════════ */
.search-bar {
  position: relative;
  display: flex;
  align-items: center;
}

.search-bar-input {
  width: 100%;
  height: 40px;
  padding: 0 var(--space-10) 0 var(--space-10);
  background: #F8FAFF;
  border: 1.5px solid rgba(59, 130, 246, 0.25);
  border-radius: var(--radius-full);
  color: #0F172A;
  font-size: var(--fs-sm);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
  outline: none;
}
.search-bar-input::placeholder { color: #94A3B8; }
.search-bar-input:focus {
  border-color: var(--color-primary-light);
  background: #FFFFFF;
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.12);
}

.search-bar-icon {
  position: absolute;
  left: var(--space-3);
  color: var(--text-muted);
  pointer-events: none;
  font-size: 1rem;
  display: flex;
  align-items: center;
}
.search-bar-clear {
  position: absolute;
  right: var(--space-3);
  color: var(--text-muted);
  cursor: pointer;
  padding: var(--space-1);
  border-radius: 50%;
  transition: color var(--transition-fast), background var(--transition-fast);
  display: none;
  align-items: center;
  justify-content: center;
  font-size: 0.875rem;
}
.search-bar-clear:hover { color: var(--text-primary); background: var(--bg-glass-light); }
.search-bar-clear.visible { display: flex; }

/* 히어로 검색바 (크게) */
.search-bar-hero .search-bar-input {
  height: 56px;
  font-size: var(--fs-base);
  padding: 0 var(--space-12) 0 var(--space-12);
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.9);
  border-color: rgba(59, 130, 246, 0.3);
  color: #0F172A;
}
.search-bar-hero .search-bar-input:focus {
  border-color: var(--color-primary-light);
  box-shadow: 0 0 0 4px rgba(30, 64, 175, 0.2);
}
.search-bar-hero .search-bar-icon { left: var(--space-5); font-size: 1.25rem; }
.search-bar-hero .search-bar-btn {
  position: absolute;
  right: var(--space-2);
  height: 44px;
  padding: 0 var(--space-5);
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  color: white;
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  transition: opacity var(--transition-fast), transform var(--transition-fast);
  cursor: pointer;
  border: none;
  font-family: inherit;
}
.search-bar-hero .search-bar-btn:hover { opacity: 0.9; transform: scale(1.02); }

/* 자동완성 드롭다운 */
.search-autocomplete {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  right: 0;
  background: #FFFFFF;
  border: 1.5px solid rgba(59, 130, 246, 0.2);
  border-radius: var(--radius-lg);
  box-shadow: 0 8px 32px rgba(30, 64, 175, 0.12);
  z-index: var(--z-dropdown);
  overflow: hidden;
  display: none;
}
.search-autocomplete.visible { display: block; animation: fadeInDown 0.2s ease; }

.autocomplete-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  font-size: var(--fs-sm);
  color: #334155;
  cursor: pointer;
  transition: background var(--transition-fast), color var(--transition-fast);
}
.autocomplete-item:hover, .autocomplete-item.focused {
  background: #EEF2FF;
  color: #0F172A;
}

/* ═══════════════════════════════════════════════════════════
   3. .video-card — 영상 카드
   ═══════════════════════════════════════════════════════════ */
.video-card {
  background: #FFFFFF;
  border: 1px solid #D1D7DC;
  border-radius: 4px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.08);
  overflow: hidden;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
  display: flex;
  flex-direction: column;
}
.video-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.15);
  border-color: #B4BEC8;
}

/* 썸네일 */
.video-card-thumb {
  position: relative;
  width: 100%;
  padding-top: 56.25%; /* 16:9 */
  overflow: hidden;
  background: #EEF2FF;
  flex-shrink: 0;
}
.video-card-thumb img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}
.video-card:hover .video-card-thumb img { transform: scale(1.05); }

/* 재생 오버레이 */
.video-card-play {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0);
  transition: background var(--transition-normal);
}
.video-card:hover .video-card-play { background: rgba(0, 0, 0, 0.4); }

.play-icon {
  width: 48px;
  height: 48px;
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(8px);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  color: white;
  opacity: 0;
  transform: scale(0.8);
  transition: opacity var(--transition-normal), transform var(--transition-normal);
}
.video-card:hover .play-icon { opacity: 1; transform: scale(1); }

/* 시청 완료 배지 */
.video-card-completed {
  position: absolute;
  top: var(--space-2);
  right: var(--space-2);
  background: rgba(5, 150, 105, 0.9);
  color: white;
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
  padding: 2px var(--space-2);
  border-radius: var(--radius-full);
}

/* 카드 본문 */
.video-card-body {
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex: 1;
}

.video-card-category {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  margin-bottom: 2px;
}

.video-card-title {
  font-size: 0.875rem;
  font-weight: 700;
  line-height: 1.4;
  color: #1C1D1F;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  transition: color var(--transition-fast);
}
.video-card:hover .video-card-title { color: #5624D0; }

/* Udemy-style instructor line */
.video-card-instructor {
  font-size: 0.75rem;
  color: #6A6F73;
  margin-top: 2px;
}

/* Udemy-style star rating */
.video-card-rating {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-top: 4px;
}
.video-card-rating-score {
  font-size: 0.8rem;
  font-weight: 700;
  color: #B4690E;
}
.video-card-stars {
  color: #E59819;
  font-size: 0.7rem;
  letter-spacing: -1px;
}
.video-card-rating-count {
  font-size: 0.72rem;
  color: #6A6F73;
}

/* Free badge */
.video-card-free {
  display: inline-block;
  margin-top: 6px;
  font-size: 0.8rem;
  font-weight: 700;
  color: #1C1D1F;
}

.video-card-meta {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--fs-xs);
  color: #6A6F73;
  margin-top: auto;
  padding-top: 4px;
}

.video-card-meta-item {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

/* ── Udemy-style 가로 스크롤 캐러셀 ── */
.course-carousel-wrap {
  position: relative;
  margin: 0 -8px;
}
.course-carousel {
  display: flex;
  gap: 12px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  padding: 4px 8px 12px;
}
.course-carousel::-webkit-scrollbar { display: none; }
.course-carousel .video-card {
  min-width: 220px;
  max-width: 220px;
  scroll-snap-align: start;
}
@media (min-width: 640px) {
  .course-carousel .video-card { min-width: 240px; max-width: 240px; }
}
@media (min-width: 1024px) {
  .course-carousel .video-card { min-width: 260px; max-width: 260px; }
}
.carousel-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: #FFFFFF;
  border: 1px solid #D1D7DC;
  box-shadow: 0 2px 8px rgba(0,0,0,0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 2;
  font-size: 1rem;
  color: #1C1D1F;
  transition: box-shadow 0.15s;
}
.carousel-btn:hover { box-shadow: 0 4px 16px rgba(0,0,0,0.25); }
.carousel-btn-prev { left: -16px; }
.carousel-btn-next { right: -16px; }

/* 수평 레이아웃 영상 카드 */
.video-card-horizontal {
  flex-direction: row;
  border-radius: var(--radius-lg);
}
.video-card-horizontal .video-card-thumb {
  width: 160px;
  padding-top: 0;
  height: 90px;
  flex-shrink: 0;
}
.video-card-horizontal .video-card-thumb img {
  position: static;
  width: 100%;
  height: 100%;
}
@media (max-width: 479px) {
  .video-card-horizontal { flex-direction: column; }
  .video-card-horizontal .video-card-thumb {
    width: 100%;
    height: auto;
    padding-top: 56.25%;
  }
  .video-card-horizontal .video-card-thumb img {
    position: absolute;
  }
}

/* ═══════════════════════════════════════════════════════════
   4. .category-pill — 카테고리 필터 버튼
   ═══════════════════════════════════════════════════════════ */
.category-pills {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
  align-items: center;
}

.category-pill {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: #F8FAFF;
  border: 1.5px solid rgba(59, 130, 246, 0.25);
  border-radius: var(--radius-full);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: #334155;
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--transition-fast);
  user-select: none;
  min-height: 36px;
}
.category-pill:hover {
  border-color: #3B82F6;
  color: #1D4ED8;
  background: #EEF2FF;
}
.category-pill.active {
  background: linear-gradient(135deg, #1D4ED8, #7C3AED);
  border-color: transparent;
  color: white;
  box-shadow: 0 2px 12px rgba(30, 64, 175, 0.35);
}
.category-pill .pill-count {
  font-size: var(--fs-xs);
  opacity: 0.7;
  background: rgba(255,255,255,0.15);
  padding: 0 6px;
  border-radius: var(--radius-full);
  line-height: 1.6;
}
.category-pill.active .pill-count { opacity: 0.9; }

/* 카테고리 카드 (그리드용) */
.category-card {
  background: #FFFFFF;
  border: 1.5px solid rgba(59, 130, 246, 0.2);
  border-radius: var(--radius-xl);
  padding: var(--space-5);
  box-shadow: 0 2px 8px rgba(30, 64, 175, 0.04);
  cursor: pointer;
  text-align: center;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
}
.category-card:hover {
  transform: translateY(-3px);
  border-color: #3B82F6;
  box-shadow: 0 4px 24px rgba(59, 130, 246, 0.2);
}
.category-card-icon {
  font-size: 2rem;
  line-height: 1;
}
.category-card-name {
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  color: #0F172A;
}
.category-card-count {
  font-size: var(--fs-xs);
  color: #64748B;
}

/* ═══════════════════════════════════════════════════════════
   5. .btn — 버튼 variants
   ═══════════════════════════════════════════════════════════ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-lg);
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  font-family: var(--font-sans);
  cursor: pointer;
  border: none;
  white-space: nowrap;
  text-decoration: none;
  transition: all var(--transition-fast);
  user-select: none;
  position: relative;
  overflow: hidden;
}
.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

/* Primary */
.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  color: white;
  box-shadow: 0 2px 8px rgba(30, 64, 175, 0.35);
}
.btn-primary:hover {
  opacity: 0.9;
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(30, 64, 175, 0.5);
}
.btn-primary:active { transform: translateY(0); }

/* Secondary */
.btn-secondary {
  background: #F8FAFF;
  color: #0F172A;
  border: 1.5px solid rgba(59, 130, 246, 0.25);
}
.btn-secondary:hover {
  background: #EEF2FF;
  border-color: #3B82F6;
  transform: translateY(-1px);
}

/* Ghost */
.btn-ghost {
  background: transparent;
  color: #334155;
  border: 1.5px solid rgba(59, 130, 246, 0.3);
}
.btn-ghost:hover {
  background: #EEF2FF;
  color: #1D4ED8;
  border-color: #3B82F6;
}

/* Danger */
.btn-danger {
  background: rgba(239, 68, 68, 0.08);
  color: #DC2626;
  border: 1.5px solid rgba(239, 68, 68, 0.3);
}
.btn-danger:hover {
  background: rgba(239, 68, 68, 0.15);
  border-color: rgba(239, 68, 68, 0.5);
}

/* Success */
.btn-success {
  background: rgba(5, 150, 105, 0.08);
  color: #059669;
  border: 1.5px solid rgba(5, 150, 105, 0.3);
}
.btn-success:hover {
  background: rgba(5, 150, 105, 0.15);
  border-color: rgba(5, 150, 105, 0.5);
}

/* 사이즈 variants */
.btn-xs { padding: var(--space-1) var(--space-3); font-size: var(--fs-xs); border-radius: var(--radius-md); }
.btn-sm { padding: var(--space-2) var(--space-4); font-size: var(--fs-xs); border-radius: var(--radius-md); }
.btn-lg { padding: var(--space-4) var(--space-8); font-size: var(--fs-base); border-radius: var(--radius-xl); }
.btn-xl { padding: var(--space-5) var(--space-10); font-size: var(--fs-md); border-radius: var(--radius-xl); }
.btn-block { width: 100%; }

/* 아이콘 버튼 */
.btn-icon {
  width: 36px;
  height: 36px;
  padding: 0;
  border-radius: var(--radius-md);
  aspect-ratio: 1;
}
.btn-icon-lg { width: 44px; height: 44px; border-radius: var(--radius-lg); }

/* 로딩 상태 */
.btn-loading {
  pointer-events: none;
}
.btn-loading::after {
  content: '';
  width: 14px;
  height: 14px;
  border: 2px solid rgba(255,255,255,0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  margin-left: var(--space-2);
}

/* ═══════════════════════════════════════════════════════════
   6. .modal — 팝업 레이어
   ═══════════════════════════════════════════════════════════ */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.5);
  backdrop-filter: blur(6px);
  z-index: var(--z-modal);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
  -webkit-backdrop-filter: blur(6px);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
}
.modal-backdrop.open {
  opacity: 1;
  pointer-events: all;
}

.modal {
  background: #FFFFFF;
  border: 1.5px solid rgba(59, 130, 246, 0.2);
  border-radius: var(--radius-2xl);
  box-shadow: 0 16px 64px rgba(30, 64, 175, 0.2);
  width: 100%;
  max-width: 560px;
  max-height: calc(100vh - 80px);
  overflow-y: auto;
  transform: scale(0.95) translateY(10px);
  transition: transform var(--transition-normal);
  position: relative;
}
.modal-backdrop.open .modal {
  transform: scale(1) translateY(0);
}

.modal-sm  { max-width: 400px; }
.modal-lg  { max-width: 720px; }
.modal-xl  { max-width: 960px; }

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-5) var(--space-6);
  border-bottom: 1px solid rgba(59, 130, 246, 0.15);
}
.modal-title {
  font-size: var(--fs-lg);
  font-weight: var(--fw-bold);
  color: #0F172A;
}
.modal-close {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #64748B;
  cursor: pointer;
  transition: color var(--transition-fast), background var(--transition-fast);
  font-size: 1.25rem;
  flex-shrink: 0;
  border: none;
  background: none;
}
.modal-close:hover { color: #0F172A; background: #EEF2FF; }

.modal-body {
  padding: var(--space-6);
}
.modal-footer {
  padding: var(--space-4) var(--space-6);
  border-top: 1px solid rgba(59, 130, 246, 0.15);
  display: flex;
  gap: var(--space-3);
  justify-content: flex-end;
}

/* ═══════════════════════════════════════════════════════════
   7. .progress-bar — 학습 진도
   ═══════════════════════════════════════════════════════════ */
.progress-bar-wrap {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}
.progress-bar-label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: var(--fs-xs);
  color: var(--text-muted);
}
.progress-bar-track {
  width: 100%;
  height: 6px;
  background: var(--bg-surface-3);
  border-radius: var(--radius-full);
  overflow: hidden;
}
.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
  border-radius: var(--radius-full);
  transition: width 0.6s ease;
  min-width: 0;
}
.progress-bar-fill.green { background: linear-gradient(90deg, var(--color-accent), var(--color-accent-light)); }
.progress-bar-fill.orange { background: linear-gradient(90deg, #D97706, #F59E0B); }

/* 굵은 진도바 */
.progress-bar-track.thick { height: 10px; }
.progress-bar-track.thin  { height: 3px; }

/* 원형 진도 */
.progress-circle {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.progress-circle svg { transform: rotate(-90deg); }
.progress-circle-bg { fill: none; stroke: var(--bg-surface-3); }
.progress-circle-fill {
  fill: none;
  stroke: url(#progressGradient);
  stroke-linecap: round;
  transition: stroke-dashoffset 0.6s ease;
}
.progress-circle-text {
  position: absolute;
  font-size: var(--fs-lg);
  font-weight: var(--fw-bold);
  color: var(--text-primary);
}

/* ═══════════════════════════════════════════════════════════
   8. 폼 인풋
   ═══════════════════════════════════════════════════════════ */
.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.form-label {
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: #334155;
}
.form-input {
  height: 44px;
  padding: 0 var(--space-4);
  background: #F8FAFF;
  border: 1.5px solid rgba(59, 130, 246, 0.25);
  border-radius: var(--radius-lg);
  color: #0F172A;
  font-size: var(--fs-sm);
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  font-family: inherit;
}
.form-input::placeholder { color: #94A3B8; }
.form-input:focus {
  border-color: var(--color-primary-light);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.12);
  background: #FFFFFF;
}
.form-input.error {
  border-color: #F87171;
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.12);
}
.form-textarea {
  height: auto;
  padding: var(--space-3) var(--space-4);
  resize: vertical;
  min-height: 100px;
}
.form-error {
  font-size: var(--fs-xs);
  color: #FCA5A5;
  display: flex;
  align-items: center;
  gap: var(--space-1);
}
.form-hint {
  font-size: var(--fs-xs);
  color: #64748B;
}

/* ═══════════════════════════════════════════════════════════
   9. .toast — 토스트 알림
   ═══════════════════════════════════════════════════════════ */
#toast-container {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  max-width: 360px;
  pointer-events: none;
}
@media (max-width: 639px) {
  #toast-container {
    bottom: var(--space-4);
    left: var(--space-4);
    right: var(--space-4);
    max-width: none;
  }
}

.toast {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-4);
  background: #FFFFFF;
  border: 1.5px solid rgba(59, 130, 246, 0.18);
  border-radius: var(--radius-xl);
  box-shadow: 0 8px 32px rgba(30, 64, 175, 0.14);
  animation: slideUp 0.3s ease;
  pointer-events: all;
  border-left: 3px solid var(--color-primary-light);
}
.toast.success { border-left-color: var(--color-accent-light); }
.toast.error   { border-left-color: #F87171; }
.toast.warning { border-left-color: #F59E0B; }
.toast.info    { border-left-color: var(--color-primary-light); }

.toast-icon { font-size: 1.1rem; flex-shrink: 0; margin-top: 1px; }
.toast-body { flex: 1; }
.toast-title { font-size: var(--fs-sm); font-weight: var(--fw-semibold); color: #0F172A; }
.toast-msg   { font-size: var(--fs-xs); color: #334155; margin-top: 2px; }
.toast-close {
  flex-shrink: 0;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 1rem;
  padding: var(--space-1);
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast);
  background: none;
  border: none;
}
.toast-close:hover { color: var(--text-primary); }

.toast.removing {
  animation: fadeIn 0.2s ease reverse;
  opacity: 0;
}

/* ═══════════════════════════════════════════════════════════
   10. 통계 카드
   ═══════════════════════════════════════════════════════════ */
.stat-card {
  background: #FFFFFF;
  border: 1.5px solid rgba(59, 130, 246, 0.18);
  border-radius: var(--radius-xl);
  box-shadow: 0 2px 12px rgba(30, 64, 175, 0.06);
  padding: var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  transition: border-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
  position: relative;
  overflow: hidden;
}
.stat-card::before {
  content: '';
  display: block;
  height: 3px;
  background: linear-gradient(90deg, #1D4ED8, #7C3AED);
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
}
.stat-card:hover {
  border-color: rgba(99, 102, 241, 0.4);
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(30, 64, 175, 0.12);
}
.stat-card-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  margin-bottom: var(--space-2);
}
.stat-card-value {
  font-size: var(--fs-2xl);
  font-weight: var(--fw-extrabold);
  color: #0F172A;
}
.stat-card-label {
  font-size: var(--fs-sm);
  color: #334155;
}
.stat-card-change {
  font-size: var(--fs-xs);
  color: #059669;
  font-weight: var(--fw-medium);
}

/* ═══════════════════════════════════════════════════════════
   11. 페이지네이션
   ═══════════════════════════════════════════════════════════ */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  margin-top: var(--space-10);
  flex-wrap: wrap;
}
.page-btn {
  min-width: 36px;
  height: 36px;
  padding: 0 var(--space-2);
  background: #F8FAFF;
  border: 1.5px solid rgba(59, 130, 246, 0.2);
  border-radius: var(--radius-md);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: #334155;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
  font-family: inherit;
}
.page-btn:hover { border-color: #3B82F6; color: #1D4ED8; background: #EEF2FF; }
.page-btn.active {
  background: linear-gradient(135deg, #1D4ED8, #7C3AED);
  border-color: transparent;
  color: white;
}
.page-btn:disabled { opacity: 0.4; cursor: not-allowed; }

/* ═══════════════════════════════════════════════════════════
   12. 정렬 셀렉트
   ═══════════════════════════════════════════════════════════ */
.sort-select {
  height: 36px;
  padding: 0 var(--space-8) 0 var(--space-3);
  background: #F8FAFF url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23334155' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E") no-repeat right 12px center;
  border: 1.5px solid rgba(59, 130, 246, 0.25);
  border-radius: var(--radius-lg);
  color: #334155;
  font-size: var(--fs-sm);
  font-family: inherit;
  cursor: pointer;
  outline: none;
  appearance: none;
  -webkit-appearance: none;
  transition: border-color var(--transition-fast);
}
.sort-select:focus { border-color: var(--color-primary-light); color: #0F172A; }
.sort-select option { background: #FFFFFF; color: #0F172A; }

/* ═══════════════════════════════════════════════════════════
   13. 학습 캘린더 스트릭
   ═══════════════════════════════════════════════════════════ */
.streak-calendar {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 3px;
}
.streak-cell {
  aspect-ratio: 1;
  border-radius: 3px;
  background: #E2E8F0;
  transition: background var(--transition-fast);
  cursor: default;
}
.streak-cell.level-1 { background: rgba(59, 130, 246, 0.2); }
.streak-cell.level-2 { background: rgba(59, 130, 246, 0.45); }
.streak-cell.level-3 { background: rgba(59, 130, 246, 0.7); }
.streak-cell.level-4 { background: #1D4ED8; }

/* ═══════════════════════════════════════════════════════════
   14. 테이블 (어드민용)
   ═══════════════════════════════════════════════════════════ */
.data-table-wrap {
  overflow-x: auto;
  border: 1.5px solid rgba(59, 130, 246, 0.2);
  border-radius: var(--radius-xl);
}
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--fs-sm);
}
.data-table thead tr {
  background: #EEF2FF;
  border-bottom: 1.5px solid rgba(59, 130, 246, 0.2);
}
.data-table th {
  padding: var(--space-3) var(--space-4);
  text-align: left;
  font-weight: var(--fw-semibold);
  color: #334155;
  white-space: nowrap;
}
.data-table td {
  padding: var(--space-3) var(--space-4);
  color: #0F172A;
  border-bottom: 1px solid rgba(59, 130, 246, 0.1);
  vertical-align: middle;
}
.data-table tbody tr:last-child td { border-bottom: none; }
.data-table tbody tr:hover { background: #F8FAFF; }

/* ═══════════════════════════════════════════════════════════
   15. 동기화 진행률 UI
   ═══════════════════════════════════════════════════════════ */
.sync-progress-panel {
  background: #F8FAFF;
  border: 1.5px solid rgba(59, 130, 246, 0.2);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  display: none;
}
.sync-progress-panel.visible { display: block; animation: fadeInUp 0.3s ease; }

.sync-status-header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}
.sync-status-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-accent-light);
  animation: pulse 1.5s ease-in-out infinite;
}
.sync-status-dot.done { background: var(--color-accent-light); animation: none; }
.sync-status-dot.error { background: #F87171; animation: none; }

.sync-log {
  background: #EEF2FF;
  border: 1px solid rgba(59, 130, 246, 0.2);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  height: 180px;
  overflow-y: auto;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: #1D4ED8;
  line-height: 1.7;
}
.sync-log-line { display: block; }
.sync-log-line.error  { color: #DC2626; }
.sync-log-line.info   { color: #334155; }
.sync-log-line.done   { color: #059669; }

/* ═══════════════════════════════════════════════════════════
   16. 푸터
   ═══════════════════════════════════════════════════════════ */
.site-footer {
  background: #F8FAFF;
  border-top: 1px solid #E2E8F0;
  padding-block: 48px 32px;
  margin-top: 0;
}
.footer-inner {
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--space-6);
  display: grid;
  gap: var(--space-8);
  grid-template-columns: 1fr;
}
@media (min-width: 768px) {
  .footer-inner { grid-template-columns: 2fr 1fr 1fr 1fr; }
}
.footer-brand-desc {
  font-size: var(--fs-sm);
  color: #64748B;
  line-height: var(--lh-relaxed);
  margin-top: var(--space-3);
}
.footer-heading {
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  color: #0F172A;
  margin-bottom: var(--space-4);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.footer-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.footer-link {
  font-size: var(--fs-sm);
  color: #64748B;
  transition: color var(--transition-fast);
}
.footer-link:hover { color: #1D4ED8; }
.footer-bottom {
  border-top: 1px solid #E2E8F0;
  padding-top: var(--space-6);
  text-align: center;
  font-size: var(--fs-xs);
  color: #94A3B8;
}

/* ═══════════════════════════════════════════════════════════
   17. 모바일 컴포넌트 최적화
   ═══════════════════════════════════════════════════════════ */
@media (max-width: 639px) {
  .nav-bar { height: 56px; }
  .category-pill { min-height: 40px; padding: var(--space-2) var(--space-3); }
  .video-card-body { padding: var(--space-3); }
  .video-card-horizontal { flex-direction: column; }
  .btn-lg { padding: var(--space-3) var(--space-6); font-size: var(--fs-sm); }
  .stat-card { padding: var(--space-4); }
  .modal { margin: var(--space-3); border-radius: var(--radius-xl); }
  #toast-container { bottom: var(--space-4); left: var(--space-3); right: var(--space-3); }
  .search-bar-hero .search-bar-input { height: 48px; }
  .search-bar-hero .search-bar-btn { height: 38px; padding: 0 var(--space-4); }
  .data-table-wrap { font-size: 13px; }
  .page-btn { min-width: 32px; height: 32px; }
}

@media (max-width: 479px) {
  .category-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .video-grid { grid-template-columns: 1fr; }
}

/* ═══════════════════════════════════════════════════════════
   시리즈 카드 (categories.html / videos-list.html 공용)
   ═══════════════════════════════════════════════════════════ */
.series-card {
  grid-column: 1 / -1;
  background: #fff;
  border: 1.5px solid rgba(99,102,241,0.22);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 2px 14px rgba(30,64,175,0.07);
  transition: box-shadow .15s;
}
.series-card:hover { box-shadow: 0 4px 24px rgba(30,64,175,0.13); }

.series-card-header {
  display: flex;
  gap: 16px;
  padding: 16px;
  cursor: pointer;
  transition: background .15s;
  align-items: flex-start;
}
.series-card-header:hover { background: #F8FAFF; }

.series-thumb-wrap {
  position: relative;
  flex-shrink: 0;
  width: 160px;
  height: 90px;
  border-radius: 10px;
  overflow: hidden;
  background: #EEF2FF;
}
.series-thumb-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.series-ep-count {
  position: absolute;
  bottom: 5px;
  right: 5px;
  background: rgba(0,0,0,0.72);
  color: #fff;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 20px;
}

.series-info {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 5px;
}
.series-cat { display: flex; gap: 4px; flex-wrap: wrap; }
.series-title {
  font-size: 1rem;
  font-weight: 700;
  color: #0F172A;
  margin: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}
.series-meta { font-size: 0.78rem; color: #64748B; }
.series-toggle-btn {
  margin-top: 6px;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 5px 14px;
  background: #EEF2FF;
  border: 1px solid rgba(99,102,241,0.3);
  border-radius: 9999px;
  color: #1D4ED8;
  font-size: 0.76rem;
  font-weight: 700;
  cursor: pointer;
  font-family: inherit;
  width: fit-content;
  transition: background .12s;
}
.series-toggle-btn:hover { background: #E0E7FF; }

/* 에피소드 목록 */
.series-episodes {
  border-top: 1px solid rgba(99,102,241,0.12);
  background: #F8FAFF;
  padding: 8px 12px 12px;
}
.episode-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
  max-height: 360px;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: rgba(99,102,241,0.3) transparent;
}
.episode-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 7px 10px;
  border-radius: 8px;
  text-decoration: none;
  color: #0F172A;
  transition: background .12s;
}
.episode-item:hover { background: #EEF2FF; }
.ep-num {
  flex-shrink: 0;
  font-size: 0.7rem;
  font-weight: 700;
  color: #6366F1;
  background: #EEF2FF;
  padding: 2px 8px;
  border-radius: 20px;
  min-width: 38px;
  text-align: center;
}
.ep-thumb {
  flex-shrink: 0;
  width: 72px;
  height: 40px;
  object-fit: cover;
  border-radius: 5px;
  background: #E2E8F0;
}
.ep-title {
  flex: 1;
  font-size: 0.82rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: #0F172A;
}
.ep-views {
  flex-shrink: 0;
  font-size: 0.73rem;
  color: #64748B;
  white-space: nowrap;
}

/* 시리즈 table row (videos-list.html) */
.series-table-row { background: #F0F4FF !important; cursor: pointer; }
.series-table-row:hover { background: #E8EDFF !important; }
.series-table-row td { border-bottom: 1px solid rgba(99,102,241,0.15) !important; }
.series-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: #6366F1;
  color: #fff;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 20px;
  margin-right: 6px;
}
.episode-table-row { background: #FAFBFF !important; }
.episode-table-row td:first-child { padding-left: 40px !important; }

@media (max-width: 600px) {
  .series-thumb-wrap { width: 100px; height: 58px; }
  .ep-thumb { width: 52px; height: 30px; }
  .series-title { font-size: 0.9rem; }
}