/* ===== CSS 변수 ===== */
:root {
  --color-bg:            #0a0a1a;
  --color-bg-secondary:  #0f0f2a;
  --color-bg-card:       rgba(255, 255, 255, 0.05);
  --color-bg-glass:      rgba(255, 255, 255, 0.08);
  --color-border:        rgba(255, 255, 255, 0.1);
  --color-border-hover:  rgba(255, 255, 255, 0.2);

  --color-primary:       #6366f1;
  --color-primary-light: #818cf8;
  --color-primary-dark:  #4f46e5;
  --color-secondary:     #8b5cf6;
  --color-accent:        #ec4899;
  --color-accent-light:  #f472b6;

  --color-success:       #10b981;
  --color-error:         #ef4444;
  --color-warning:       #f59e0b;
  --color-info:          #3b82f6;

  --color-text-primary:   rgba(255, 255, 255, 0.95);
  --color-text-secondary: rgba(255, 255, 255, 0.65);
  --color-text-muted:     rgba(255, 255, 255, 0.4);

  --font-main: 'Pretendard', 'Noto Sans KR', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-xs:   0.75rem;
  --font-size-sm:   0.875rem;
  --font-size-base: 1rem;
  --font-size-lg:   1.125rem;
  --font-size-xl:   1.25rem;
  --font-size-2xl:  1.5rem;
  --font-size-3xl:  1.875rem;

  --spacing-xs:  0.25rem;
  --spacing-sm:  0.5rem;
  --spacing-md:  1rem;
  --spacing-lg:  1.5rem;
  --spacing-xl:  2rem;
  --spacing-2xl: 3rem;

  --radius-sm:   0.375rem;
  --radius-md:   0.75rem;
  --radius-lg:   1rem;
  --radius-xl:   1.5rem;
  --radius-full: 9999px;

  --shadow-sm:  0 1px 3px rgba(0,0,0,0.4);
  --shadow-md:  0 4px 16px rgba(0,0,0,0.5);
  --shadow-lg:  0 8px 32px rgba(0,0,0,0.6);
  --shadow-xl:  0 16px 48px rgba(0,0,0,0.7);
  --shadow-glow-primary: 0 0 20px rgba(99,102,241,0.4);
  --shadow-glow-accent:  0 0 20px rgba(236,72,153,0.4);

  --transition-fast:   150ms ease;
  --transition-base:   300ms ease;
  --transition-slow:   500ms ease;

  --player-height: 80px;
}

/* ===== 리셋 & 기본 ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-main);
  background: var(--color-bg);
  color: var(--color-text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  padding-bottom: calc(var(--player-height) + var(--spacing-xl));
  opacity: 0;
  transition: opacity 0.3s ease;
  user-select: none;
  -webkit-user-select: none;
}

/* 입력 필드 등은 텍스트 선택이 가능하도록 화이트리스트 처리 */
input, textarea, [contenteditable="true"] {
  user-select: text;
  -webkit-user-select: text;
}

/* 폰트 로드 완료 후 표시 */
body.fonts-loaded {
  opacity: 1;
}

body::before {
  content: '';
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background:
    radial-gradient(ellipse 80% 60% at 20% 10%, rgba(99,102,241,0.15) 0%, transparent 50%),
    radial-gradient(ellipse 60% 50% at 80% 80%, rgba(139,92,246,0.12) 0%, transparent 50%),
    radial-gradient(ellipse 40% 40% at 60% 30%, rgba(236,72,153,0.08) 0%, transparent 40%);
  pointer-events: none;
  z-index: 0;
}

/* ===== 스크롤바 ===== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.15); border-radius: var(--radius-full); }
::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.25); }

/* ===== 공통 컴포넌트 ===== */
.glass-card {
  background: var(--color-bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

.glass-card:hover {
  border-color: var(--color-border-hover);
  box-shadow: var(--shadow-lg);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: 0.625rem var(--spacing-lg);
  border: none;
  border-radius: var(--radius-full);
  font-family: var(--font-main);
  font-size: var(--font-size-sm);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  user-select: none;
  white-space: nowrap;
  text-decoration: none;
}

.btn:focus-visible { outline: 2px solid var(--color-primary-light); outline-offset: 2px; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; pointer-events: none; }

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  color: #fff;
  box-shadow: 0 2px 12px rgba(99,102,241,0.35);
}
.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 20px rgba(99,102,241,0.5);
}
.btn-primary:active { transform: translateY(0); }

.btn-secondary {
  background: var(--color-bg-glass);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
}
.btn-secondary:hover {
  background: rgba(255,255,255,0.12);
  border-color: var(--color-border-hover);
}

.btn-icon {
  width: 36px;
  height: 36px;
  padding: 0;
  border-radius: var(--radius-full);
  background: var(--color-bg-glass);
  border: 1px solid var(--color-border);
  color: var(--color-text-secondary);
}
.btn-icon:hover { color: var(--color-text-primary); background: rgba(255,255,255,0.12); }
.btn-icon.danger:hover { color: var(--color-error); border-color: var(--color-error); }
.btn-icon.active { color: #fbbf24; border-color: #fbbf24; }

.material-symbols-rounded { user-select: none; font-size: 1.25rem; }

/* ===== 레이아웃 ===== */
.container {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
  position: relative;
  z-index: 1;
}

/* ===== 헤더 ===== */
.header {
  padding: var(--spacing-xl) 0 var(--spacing-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-glow-primary);
}

.logo-icon .material-symbols-rounded { color: #fff; font-size: 1.5rem; }

.logo-text {
  font-size: var(--font-size-xl);
  font-weight: 800;
  background: linear-gradient(135deg, var(--color-primary-light), var(--color-accent-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.02em;
}

.logo-sub {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  letter-spacing: 0.05em;
  display: block;
  margin-top: -2px;
}

/* ===== 변환 섹션 ===== */
.convert-section {
  padding: var(--spacing-xl) var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.section-title {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  background: linear-gradient(135deg, var(--color-text-primary), var(--color-primary-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-subtitle {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xl);
}

/* ===== 형식 선택 ===== */
.format-selector {
  display: flex;
  gap: var(--spacing-xs);
  background: rgba(0,0,0,0.3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  padding: 4px;
  width: fit-content;
  margin-bottom: var(--spacing-lg);
}

.format-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 0.5rem var(--spacing-lg);
  background: transparent;
  border: none;
  border-radius: var(--radius-full);
  color: var(--color-text-muted);
  font-family: var(--font-main);
  font-size: var(--font-size-sm);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.format-btn .material-symbols-rounded { font-size: 1.1rem; }

.format-btn.active.mp3 {
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  color: #fff;
  box-shadow: 0 2px 12px rgba(99,102,241,0.4);
}

.format-btn.active.mp4 {
  background: linear-gradient(135deg, var(--color-accent), #a855f7);
  color: #fff;
  box-shadow: 0 2px 12px rgba(236,72,153,0.4);
}

.format-btn:hover:not(.active) { color: var(--color-text-primary); background: rgba(255,255,255,0.08); }

/* ===== 품질 선택 ===== */
.quality-selector {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
  margin-bottom: var(--spacing-lg);
  animation: fadeIn var(--transition-base);
}

.quality-label {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-right: var(--spacing-xs);
  white-space: nowrap;
}

.quality-btn {
  padding: 0.375rem var(--spacing-md);
  background: var(--color-bg-glass);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  color: var(--color-text-secondary);
  font-family: var(--font-main);
  font-size: var(--font-size-xs);
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition-fast);
  letter-spacing: 0.03em;
}

.quality-btn:hover { color: var(--color-text-primary); border-color: var(--color-border-hover); background: rgba(255,255,255,0.1); }

.quality-btn.active {
  background: rgba(99,102,241,0.2);
  border-color: var(--color-primary);
  color: var(--color-primary-light);
}

.format-mp4 .quality-btn.active {
  background: rgba(236,72,153,0.2);
  border-color: var(--color-accent);
  color: var(--color-accent-light);
}

/* ===== URL 입력 ===== */
.url-input-wrapper {
  display: flex;
  gap: var(--spacing-sm);
  align-items: stretch;
  position: relative;
}

.url-input {
  flex: 1;
  padding: 0.875rem var(--spacing-lg);
  background: rgba(0,0,0,0.4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  color: var(--color-text-primary);
  font-family: var(--font-main);
  font-size: var(--font-size-base);
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.url-input::placeholder { color: var(--color-text-muted); }
.url-input:focus { border-color: var(--color-primary); box-shadow: 0 0 0 3px rgba(99,102,241,0.15); }

/* 클립보드 감지 애니메이션 */
@keyframes autoPasteGlow {
  0%   { border-color: var(--color-success); box-shadow: 0 0 0 0 rgba(16,185,129,0.6); }
  50%  { border-color: var(--color-success); box-shadow: 0 0 0 6px rgba(16,185,129,0); }
  100% { border-color: var(--color-border);  box-shadow: none; }
}
.url-input.auto-pasted { animation: autoPasteGlow 1.2s ease forwards; }

.convert-btn {
  padding: 0.875rem var(--spacing-xl);
  font-size: var(--font-size-base);
  flex-shrink: 0;
}

.convert-btn .material-symbols-rounded { font-size: 1.2rem; }

/* 클립보드 감지 뱃지 */
.clipboard-badge {
  display: none;
  align-items: center;
  gap: var(--spacing-xs);
  margin-top: var(--spacing-sm);
  font-size: var(--font-size-xs);
  color: var(--color-success);
  animation: fadeIn 0.3s ease;
}
.clipboard-badge.visible { display: flex; }
.clipboard-badge .material-symbols-rounded { font-size: 0.9rem; }

/* ===== 진행바 ===== */
.progress-container {
  display: none;
  margin-top: var(--spacing-lg);
  animation: fadeIn var(--transition-base);
}
.progress-container.visible { display: block; }

/* ===== 대기열 ===== */
.queue-section {
  display: none;
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--color-border);
  animation: fadeIn var(--transition-base);
}
.queue-section.visible { display: block; }

.queue-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}
.queue-header .material-symbols-rounded { font-size: 1.1rem; color: var(--color-primary-light); }
.queue-title { font-weight: 600; color: var(--color-text-primary); }
.queue-count {
  margin-left: auto;
  font-size: var(--font-size-xs);
  background: rgba(99,102,241,0.15);
  color: var(--color-primary-light);
  padding: 2px 8px;
  border-radius: var(--radius-full);
  font-weight: 700;
}

.queue-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.queue-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  background: rgba(0,0,0,0.3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  animation: slideIn 0.25s ease;
}
@keyframes slideIn {
  from { opacity: 0; transform: translateY(-8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.queue-item-thumb {
  width: 44px;
  height: 30px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
  background: rgba(255,255,255,0.05);
}

.queue-item-info {
  flex: 1;
  min-width: 0;
}
.queue-item-title {
  font-size: var(--font-size-sm);
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--color-text-primary);
}
.queue-item-meta {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  margin-top: 2px;
}

.queue-item-badge {
  font-size: 0.65rem;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: var(--radius-full);
  flex-shrink: 0;
}
.queue-item-badge.mp3 { background: rgba(99,102,241,0.2); color: var(--color-primary-light); border: 1px solid rgba(99,102,241,0.4); }
.queue-item-badge.mp4 { background: rgba(236,72,153,0.2); color: var(--color-accent-light);   border: 1px solid rgba(236,72,153,0.4); }

.queue-item-remove {
  width: 28px;
  height: 28px;
  padding: 0;
  border: none;
  background: transparent;
  color: var(--color-text-muted);
  cursor: pointer;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
  flex-shrink: 0;
}
.queue-item-remove:hover { color: var(--color-error); background: rgba(239,68,68,0.1); }
.queue-item-remove .material-symbols-rounded { font-size: 1rem; }

.queue-add-row {
  display: flex;
  justify-content: flex-end;
}
.queue-add-btn { font-size: var(--font-size-xs); padding: 0.4rem var(--spacing-md); }
.queue-add-btn .material-symbols-rounded { font-size: 1rem; }

.progress-text {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-sm);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.progress-bar-track {
  height: 6px;
  background: rgba(255,255,255,0.08);
  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);
  width: 0%;
  transition: width 0.3s ease;
  position: relative;
  overflow: hidden;
}

.progress-bar-fill::after {
  content: '';
  position: absolute;
  top: 0; left: -100%; right: 0; bottom: 0;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
  animation: shimmer 1.5s infinite;
}

@keyframes shimmer { to { left: 100%; } }

/* ===== 영상 미리보기 ===== */
.video-preview {
  display: none;
  margin-top: var(--spacing-lg);
  animation: fadeInUp var(--transition-base);
}
.video-preview.visible { display: flex; gap: var(--spacing-md); align-items: flex-start; }

.preview-thumbnail {
  width: 120px;
  height: 68px;
  object-fit: cover;
  border-radius: var(--radius-md);
  flex-shrink: 0;
  background: rgba(255,255,255,0.05);
}

.preview-info { flex: 1; min-width: 0; }

.preview-title {
  font-size: var(--font-size-sm);
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: 4px;
}

.preview-meta {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.preview-meta span { display: flex; align-items: center; gap: 4px; }
.preview-meta .material-symbols-rounded { font-size: 0.9rem; }

/* ===== 라이브러리 ===== */
.library-section { margin-bottom: var(--spacing-2xl); }

.library-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-md);
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.library-title {
  font-size: var(--font-size-xl);
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.library-title .material-symbols-rounded { color: var(--color-primary-light); }

.sort-select {
  padding: 0.375rem var(--spacing-md);
  background: var(--color-bg-glass);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  color: var(--color-text-secondary);
  font-family: var(--font-main);
  font-size: var(--font-size-xs);
  cursor: pointer;
  outline: none;
}

.sort-select:focus { border-color: var(--color-primary); }

/* ===== 검색 및 필터 컨트롤 ===== */
.library-controls {
  display: flex;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
  flex-wrap: nowrap; /* 모바일에서도 한 줄에 유지 */
  align-items: center;
}

.search-wrapper {
  flex: 1;
  min-width: 0; /* 폭을 유연하게 조정 가능하도록 */
  display: flex;
  align-items: center;
  background: var(--color-bg-glass);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 0 0.8rem;
  transition: all var(--transition-fast);
}

.search-wrapper:focus-within {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.search-wrapper .material-symbols-rounded {
  color: var(--color-text-muted);
  font-size: 1.2rem;
}

.search-wrapper input {
  width: 100%;
  border: none;
  background: transparent;
  color: var(--color-text-primary);
  padding: 0.6rem;
  outline: none;
  font-size: var(--font-size-sm);
}

.filter-switch {
  display: inline-flex;
  background: var(--color-bg-glass);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 3px;
  gap: 2px;
}

.filter-btn {
  padding: 0.4rem 0.6rem;
  border: none;
  background: transparent;
  color: var(--color-text-muted);
  border-radius: calc(var(--radius-md) - 2px);
  cursor: pointer;
  font-size: var(--font-size-xs);
  font-weight: 600;
  transition: all var(--transition-fast);
}

.filter-btn.active {
  background: var(--color-primary);
  color: #fff;
}

/* ===== 즐겨찾기 아이콘 강화 ===== */
.fav-btn .material-symbols-rounded {
  transition: transform 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.fav-btn:hover .material-symbols-rounded {
  transform: scale(1.2);
}

.fav-btn.active .material-symbols-rounded {
  color: #ff4d6d !important;
  font-variation-settings: 'FILL' 1; /* 구글 머티리얼 심볼 채우기 설정 */
}

/* ===== 폴더 탭 ===== */
.folder-tabs {
  display: flex;
  gap: var(--spacing-sm);
  overflow-x: auto;
  padding-bottom: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
  scrollbar-width: none;
}
.folder-tabs::-webkit-scrollbar { display: none; }

.tab-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: 0.5rem var(--spacing-md);
  background: var(--color-bg-glass);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  color: var(--color-text-muted);
  font-family: var(--font-main);
  font-size: var(--font-size-sm);
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--transition-fast);
  flex-shrink: 0;
  position: relative;
  user-select: none;
  -webkit-touch-callout: none;
}

.tab-btn:hover { color: var(--color-text-primary); border-color: var(--color-border-hover); }

.tab-btn.active {
  background: rgba(99,102,241,0.2);
  border-color: var(--color-primary);
  color: var(--color-primary-light);
}

.tab-btn .material-symbols-rounded { font-size: 1rem; }

/* 삭제 모드 */
.tab-btn.edit-mode {
  animation: wiggle 0.3s infinite;
  border-color: var(--color-error);
  padding-right: 2.2rem;
}

@keyframes wiggle {
  0% { transform: rotate(0deg); }
  25% { transform: rotate(1deg); }
  75% { transform: rotate(-1deg); }
  100% { transform: rotate(0deg); }
}

.tab-delete-btn {
  position: absolute;
  right: 6px;
  width: 20px;
  height: 20px;
  background: var(--color-error);
  color: #fff;
  border-radius: 50%;
  display: none;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  z-index: 2;
}

.tab-btn.edit-mode .tab-delete-btn {
  display: flex;
}

.add-folder-btn {
  background: transparent;
  border: 1px dashed var(--color-border);
}
.add-folder-btn:hover { border-style: solid; border-color: var(--color-primary); color: var(--color-primary-light); }

/* ===== 트랙 그리드 ===== */
.track-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: var(--spacing-md);
}

.empty-state {
  text-align: center;
  padding: var(--spacing-2xl) var(--spacing-xl);
  color: var(--color-text-muted);
}

.empty-state .material-symbols-rounded { font-size: 3rem; margin-bottom: var(--spacing-md); display: block; opacity: 0.4; }
.empty-state p { font-size: var(--font-size-sm); }

/* ===== 트랙 카드 ===== */
.track-card {
  position: relative;
  overflow: hidden;
  cursor: pointer;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.track-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.track-thumbnail-wrap {
  position: relative;
  width: 100%;
  padding-top: 56.25%;
  background: rgba(255,255,255,0.05);
  overflow: hidden;
}

.track-thumbnail {
  position: absolute;
  top: 0; left: 0; width: 100%; height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.track-card:hover .track-thumbnail { transform: scale(1.05); }

.track-overlay {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.track-card:hover .track-overlay { opacity: 1; }

.track-play-btn {
  width: 48px;
  height: 48px;
  background: rgba(255,255,255,0.2);
  border: 2px solid rgba(255,255,255,0.6);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(8px);
  transition: all var(--transition-fast);
}

.track-play-btn:hover { background: rgba(255,255,255,0.3); transform: scale(1.1); }
.track-play-btn .material-symbols-rounded { color: #fff; font-size: 1.5rem; }

/* 형식 뱃지 */
.format-badge {
  position: absolute;
  top: var(--spacing-sm);
  right: var(--spacing-sm);
  padding: 2px 8px;
  border-radius: var(--radius-full);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  backdrop-filter: blur(8px);
}

.format-badge.mp3 { background: rgba(99,102,241,0.8); color: #fff; }
.format-badge.mp4 { background: rgba(236,72,153,0.8); color: #fff; }

/* 품질 뱃지 */
.quality-badge {
  position: absolute;
  top: var(--spacing-sm);
  left: var(--spacing-sm);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  font-size: 10px;
  font-weight: 700;
  background: rgba(0,0,0,0.7);
  color: rgba(255,255,255,0.8);
  backdrop-filter: blur(4px);
}

.track-info { padding: var(--spacing-md); }

.track-title {
  font-size: var(--font-size-sm);
  font-weight: 600;
  margin-bottom: 4px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  line-height: 1.4;
}

.track-meta {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-md);
}

.track-actions {
  display: flex;
  gap: var(--spacing-xs);
}

/* ===== 오디오 플레이어 ===== */
.audio-player {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: var(--player-height);
  background: rgba(10,10,26,0.92);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-top: 1px solid var(--color-border);
  z-index: 100;
  display: none;
}

.audio-player.visible { display: flex; align-items: center; }

.player-inner {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: var(--spacing-lg);
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
}

.player-track {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  min-width: 0;
}

.player-thumb {
  width: 48px;
  height: 48px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
  background: rgba(255,255,255,0.05);
}

.player-track-info { min-width: 0; }

.player-title {
  font-size: var(--font-size-sm);
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.player-artist { font-size: var(--font-size-xs); color: var(--color-text-muted); }

.player-controls {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-xs);
}

.player-btns {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.player-play-btn {
  width: 44px;
  height: 44px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  border: none;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  box-shadow: 0 2px 12px rgba(99,102,241,0.4);
}

.player-play-btn:hover { transform: scale(1.05); }
.player-play-btn .material-symbols-rounded { color: #fff; font-size: 1.5rem; }

.player-progress {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  width: 300px;
}

.player-time { font-size: 11px; color: var(--color-text-muted); min-width: 3rem; text-align: center; }

.progress-slider {
  flex: 1;
  -webkit-appearance: none;
  appearance: none;
  height: 4px;
  background: rgba(255,255,255,0.1);
  border-radius: var(--radius-full);
  cursor: pointer;
}

.progress-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  background: var(--color-primary-light);
  border-radius: var(--radius-full);
  cursor: pointer;
  box-shadow: 0 0 6px rgba(99,102,241,0.5);
}

.player-right {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--spacing-md);
}

.volume-control {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.volume-slider {
  width: 80px;
  -webkit-appearance: none;
  appearance: none;
  height: 4px;
  background: rgba(255,255,255,0.1);
  border-radius: var(--radius-full);
  cursor: pointer;
}

.volume-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 12px;
  height: 12px;
  background: var(--color-text-secondary);
  border-radius: var(--radius-full);
  cursor: pointer;
}

/* ===== 모달 ===== */
.modal-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.7);
  backdrop-filter: blur(8px);
  z-index: 200;
  align-items: center;
  justify-content: center;
}
.modal-backdrop.visible { display: flex; }

.modal {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  width: 90%;
  max-width: 400px;
  animation: scaleIn var(--transition-base);
}

.modal-title {
  font-size: var(--font-size-lg);
  font-weight: 700;
  margin-bottom: var(--spacing-lg);
}

.modal-input {
  width: 100%;
  padding: 0.75rem var(--spacing-md);
  background: rgba(0,0,0,0.4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  font-family: var(--font-main);
  font-size: var(--font-size-base);
  outline: none;
  margin-bottom: var(--spacing-lg);
}

.modal-input:focus { border-color: var(--color-primary); }

.modal-actions {
  display: flex;
  gap: var(--spacing-sm);
  justify-content: flex-end;
}

/* ===== 토스트 ===== */
.toast-container {
  position: fixed;
  bottom: calc(var(--player-height) + var(--spacing-lg));
  left: 50%;
  transform: translateX(-50%);
  z-index: 300;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  align-items: center;
  pointer-events: none;
}

.toast {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: 0.75rem var(--spacing-lg);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: 500;
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow-lg);
  animation: slideUp var(--transition-base);
  pointer-events: auto;
  white-space: nowrap;
}

.toast.success { background: rgba(16,185,129,0.9); color: #fff; }
.toast.error   { background: rgba(239,68,68,0.9);  color: #fff; }
.toast.warning { background: rgba(245,158,11,0.9); color: #fff; }
.toast.info    { background: rgba(59,130,246,0.9); color: #fff; }
.toast .material-symbols-rounded { font-size: 1.1rem; }

/* ===== 애니메이션 ===== */
@keyframes fadeIn      { from { opacity: 0; } to { opacity: 1; } }
@keyframes fadeInUp    { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: translateY(0); } }
@keyframes fadeInDown  { from { opacity: 0; transform: translateY(-12px); } to { opacity: 1; transform: translateY(0); } }
@keyframes slideUp     { from { opacity: 0; transform: translateY(16px); } to { opacity: 1; transform: translateY(0); } }
@keyframes scaleIn     { from { opacity: 0; transform: scale(0.9); } to { opacity: 1; transform: scale(1); } }

/* ===== 반응형 768px ===== */
@media (max-width: 768px) {
  .container { padding: 0 var(--spacing-md); }

  .convert-section { padding: var(--spacing-lg); }
  .section-title { font-size: var(--font-size-xl); }

  .url-input-wrapper { flex-direction: column; }
  .convert-btn { width: 100%; justify-content: center; }

  .track-grid { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: var(--spacing-sm); }

  .player-inner { grid-template-columns: 1fr auto; gap: var(--spacing-sm); padding: 0 var(--spacing-md); }
  .player-right { display: none; }
  .player-progress { width: 180px; }

  .video-preview.visible { flex-direction: column; }
  .preview-thumbnail { width: 100%; height: 180px; padding-top: 0; }
}

/* ===== 반응형 480px ===== */
@media (max-width: 480px) {
  :root { --player-height: 70px; }

  .header { padding: var(--spacing-lg) 0 var(--spacing-md); }
  .logo-sub { display: none; }

  .format-selector { width: 100%; justify-content: center; }
  .format-btn { flex: 1; justify-content: center; }

  .quality-selector { justify-content: flex-start; }

  .track-grid { grid-template-columns: 1fr 1fr; }

  .player-progress { width: 140px; }
  .player-time { display: none; }

  .toast { font-size: var(--font-size-xs); padding: 0.625rem var(--spacing-md); }
}
/* ===== 비디오 플레이어 오버레이 ===== */
.video-overlay {
  display: none;
  background: #000;
  z-index: 1000;
  overflow: hidden;
  transition: all 0.3s ease;
}

.video-overlay.visible {
  display: flex;
  justify-content: center;
  align-items: center;
}

.video-container {
  position: relative;
  width: 100%;
  height: 100%;
  background: #000;
}

#mainVideo {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.close-video-btn {
  position: absolute;
  top: 10px;
  right: 10px;
  width: 40px;
  height: 40px;
  background: rgba(0,0,0,0.5);
  color: #fff;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  z-index: 1001;
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(4px);
}

/* 세로 모드: 상단 고정 */
@media screen and (orientation: portrait) {
  .video-overlay.visible {
    position: sticky;
    top: 0;
    width: 100%;
    aspect-ratio: 16 / 9;
    box-shadow: 0 4px 20px rgba(0,0,0,0.5);
  }
}

/* 가로 모드: 전체 화면 */
@media screen and (orientation: landscape) {
  .video-overlay.visible {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
  }
  body.video-active #audioPlayer {
    display: none;
  }
}

body.video-active .container {
  padding-top: 0;
}

.track-card {
  user-select: none;
  -webkit-touch-callout: none;
}

.audio-player {
  transition: transform 0.4s cubic-bezier(0.165, 0.84, 0.44, 1), opacity 0.4s ease;
}

.audio-player.hidden-slide {
  transform: translateY(120%);
  opacity: 0;
  pointer-events: none;
}

/* ===== Folder Select Modal (LED Neon Style) ===== */
.folder-select-modal {
  max-width: 400px;
}

.folder-select-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  margin: var(--spacing-lg) 0;
  max-height: 350px;
  overflow-y: auto;
  padding: 4px;
}

.folder-select-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: 1rem var(--spacing-lg);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
  user-select: none;
}

.folder-select-item:hover {
  background: rgba(255, 255, 255, 0.06);
  border-color: var(--color-border-hover);
}

.folder-select-item .folder-icon {
  color: var(--color-text-muted);
  transition: all 0.3s ease;
  font-size: 1.4rem;
}

.folder-select-item .folder-name {
  flex: 1;
  color: var(--color-text-secondary);
  font-weight: 600;
  font-size: var(--font-size-sm);
  transition: all 0.3s ease;
}

/* LED Indicator */
.led-indicator {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #1a1a1a;
  box-shadow: inset 0 1px 2px rgba(0,0,0,0.8);
  transition: all 0.3s ease;
  border: 1px solid rgba(255,255,255,0.05);
}

/* Selected State (LED ON / Neon Effect) */
.folder-select-item.selected {
  background: rgba(99, 102, 241, 0.08);
  border-color: var(--color-primary);
  box-shadow: 
    inset 0 0 10px rgba(99, 102, 241, 0.1),
    0 0 15px rgba(99, 102, 241, 0.15);
}

.folder-select-item.selected .folder-icon {
  color: var(--color-primary-light);
  filter: drop-shadow(0 0 8px var(--color-primary));
}

.folder-select-item.selected .folder-name {
  color: #fff;
  text-shadow: 0 0 10px rgba(99, 102, 241, 0.5);
}

.folder-select-item.selected .led-indicator {
  background: #00ff88; /* Bright Neon Green */
  border-color: #00ff88;
  box-shadow: 
    0 0 8px #00ff88,
    0 0 15px rgba(0, 255, 136, 0.6),
    0 0 25px rgba(0, 255, 136, 0.3);
  animation: ledGlow 1.5s infinite alternate;
}

@keyframes ledGlow {
  from { opacity: 0.8; transform: scale(0.95); }
  to { opacity: 1; transform: scale(1.05); }
}

.folder-select-item:active {
  transform: scale(0.97);
}

.empty-msg {
  text-align: center;
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  padding: var(--spacing-xl) 0;
}



/* ===== SortableJS Drag & Drop ===== */

/* 드래그 중 원래 위치에 남는 반투명 자리표시 */
.sortable-ghost {
  opacity: 0.3;
  border: 2px dashed var(--color-primary) !important;
  background: rgba(99, 102, 241, 0.1) !important;
}

/* 선택된(꾹 누른) 카드 — 밝게 빛남 */
.sortable-chosen {
  box-shadow: 
    0 0 25px rgba(99, 102, 241, 0.7),
    0 0 10px rgba(255, 255, 255, 0.4);
  border-color: #fff !important;
  transform: scale(1.03);
  z-index: 1000;
}

/* 실제 드래그 중인 카드 */
.sortable-drag {
  opacity: 0.95 !important;
  box-shadow: 
    0 10px 40px rgba(0, 0, 0, 0.5),
    0 0 30px rgba(99, 102, 241, 0.6);
  border: 2px solid var(--color-primary-light) !important;
  transform: scale(1.05) rotate(1deg);
}

/* fallback 모드 카드 (forceFallback: true 사용 시) */
.sortable-fallback {
  opacity: 0.9 !important;
  box-shadow: 
    0 10px 40px rgba(0, 0, 0, 0.5),
    0 0 30px rgba(99, 102, 241, 0.6);
}

/* 드래그 시 카드 전환 부드러움 */
.track-card {
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

/* ===== YouTube Search & Convert Tabs (Segmented Control) ===== */
.convert-tabs-wrapper {
  display: flex;
  justify-content: center;
  margin-bottom: var(--spacing-lg);
  margin-top: var(--spacing-sm);
  perspective: 1000px;
}

.convert-tabs {
  position: relative;
  display: flex;
  background: rgba(15, 17, 26, 0.45);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 100px;
  padding: 4px;
  width: 100%;
  max-width: 440px; /* Widen container to prevent text wrapping */
  box-shadow: 
    inset 0 2px 5px rgba(0, 0, 0, 0.5),
    0 10px 30px rgba(0, 0, 0, 0.25);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.convert-tab-btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  background: none;
  border: none;
  color: rgba(255, 255, 255, 0.55); /* High contrast readable inactive state */
  font-family: inherit;
  font-size: 14.5px;
  font-weight: 700; /* Bold readable font */
  padding: 12px 16px;
  cursor: pointer;
  border-radius: 100px;
  transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  position: relative;
  z-index: 2;
  user-select: none;
  white-space: nowrap; /* Prevent horizontal wrapping completely */
}

.convert-tab-btn:hover {
  color: rgba(255, 255, 255, 0.95);
}

.convert-tab-btn.active {
  color: #ffffff !important; /* Solid high-contrast text */
  text-shadow: 0 0 8px rgba(255, 255, 255, 0.2), 0 1px 2px rgba(0, 0, 0, 0.4);
}

/* 탭 배경 슬라이더 (Pill 형태) */
.convert-tab-slider {
  position: absolute;
  top: 4px;
  bottom: 4px;
  left: 4px;
  width: calc(50% - 4px);
  background: linear-gradient(135deg, #6366f1, #8b5cf6); /* Indigo to Violet premium gradient */
  border-radius: 100px;
  box-shadow: 
    0 4px 15px rgba(99, 102, 241, 0.45),
    inset 0 1px 1px rgba(255, 255, 255, 0.35);
  transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1); /* Elastic bouncing animation */
  z-index: 1;
  pointer-events: none;
}

/* 두 번째 탭이 active 일 때 슬라이더 이동 */
.convert-tabs:has(.convert-tab-btn[data-target="tabSearchContent"].active) .convert-tab-slider {
  transform: translateX(100%);
}

/* 탭 콘텐츠 페이드인 애니메이션 */
.convert-tab-content {
  display: none;
}

.convert-tab-content.active {
  display: block;
  animation: tabFadeIn 0.4s cubic-bezier(0.25, 0.8, 0.25, 1) forwards;
}

@keyframes tabFadeIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===== YouTube Search Tab Custom Styling ===== */
.yt-search-wrapper {
  position: relative;
  display: flex;
  align-items: center;
  background: rgba(0, 0, 0, 0.45);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-full); /* Make it perfectly rounded just like link url input! */
  padding: 0 var(--spacing-lg);
  height: 52px;
  transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  margin-bottom: var(--spacing-lg);
}

.yt-search-wrapper:focus-within {
  background: rgba(0, 0, 0, 0.6);
  border-color: rgba(99, 102, 241, 0.65);
  box-shadow: 
    0 0 20px rgba(99, 102, 241, 0.25),
    inset 0 1px 1px rgba(255, 255, 255, 0.05);
}

.yt-search-icon {
  color: rgba(255, 255, 255, 0.35);
  margin-right: var(--spacing-sm);
  font-size: 1.35rem;
  transition: all 0.3s ease;
  cursor: pointer;
}

.yt-search-icon:hover {
  color: var(--color-primary-light);
  transform: scale(1.1);
}

.yt-search-wrapper:focus-within .yt-search-icon {
  color: var(--color-primary-light);
}

.yt-search-input {
  flex: 1;
  background: none;
  border: none;
  color: var(--color-text);
  font-family: inherit;
  font-size: var(--font-size-base);
  height: 100%;
  outline: none;
}

.yt-search-input::placeholder {
  color: rgba(255, 255, 255, 0.25);
}

.yt-search-clear {
  background: none;
  border: none;
  color: rgba(255, 255, 255, 0.35);
  cursor: pointer;
  padding: 4px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
}

.yt-search-clear:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--color-text);
}

.yt-search-clear span {
  font-size: 1.1rem;
}

/* ===== Recent Search Keywords (Chips) ===== */
.recent-searches {
  margin-bottom: var(--spacing-xl);
  animation: tabFadeIn 0.35s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.recent-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-md);
}

.recent-title {
  font-size: 11px;
  font-weight: var(--font-weight-bold);
  color: rgba(255, 255, 255, 0.35);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.clear-all-btn {
  background: none;
  border: none;
  color: rgba(255, 255, 255, 0.4);
  font-family: inherit;
  font-size: 11px;
  font-weight: var(--font-weight-semibold);
  cursor: pointer;
  transition: color 0.2s ease;
}

.clear-all-btn:hover {
  color: var(--color-primary-light);
}

.recent-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.recent-chip {
  display: flex;
  align-items: center;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 30px;
  padding: 6px 13px;
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.recent-chip:hover {
  background: rgba(99, 102, 241, 0.1);
  border-color: rgba(99, 102, 241, 0.3);
  transform: translateY(-2px);
  box-shadow: 0 4px 10px rgba(99, 102, 241, 0.1);
}

.recent-chip-text {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: rgba(255, 255, 255, 0.7);
  margin-right: var(--spacing-xs);
  pointer-events: none;
}

.recent-chip:hover .recent-chip-text {
  color: #fff;
}

.recent-chip-remove {
  background: none;
  border: none;
  color: rgba(255, 255, 255, 0.25);
  cursor: pointer;
  border-radius: 50%;
  width: 16px;
  height: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  transition: all 0.2s ease;
  font-size: 0.75rem;
}

.recent-chip-remove:hover {
  background: rgba(255, 255, 255, 0.12);
  color: #f43f5e;
}

/* ===== Search Results List (Premium Cards) ===== */
.yt-search-results {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  max-height: 440px;
  overflow-y: auto;
  padding-right: 4px;
}

.yt-search-results::-webkit-scrollbar {
  width: 5px;
}
.yt-search-results::-webkit-scrollbar-track {
  background: transparent;
}
.yt-search-results::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.08);
  border-radius: 3px;
}
.yt-search-results::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.16);
}

.yt-search-empty {
  text-align: center;
  padding: var(--spacing-xxl) var(--spacing-lg);
  color: var(--color-text-muted);
}

.yt-search-empty span {
  font-size: 2.8rem;
  margin-bottom: var(--spacing-md);
  opacity: 0.2;
  display: inline-block;
}

.yt-search-empty p {
  font-size: var(--font-size-sm);
  line-height: 1.6;
}

.yt-search-spinner {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 3rem 0;
}

.spinner-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-md);
}

.spinner {
  width: 40px;
  height: 40px;
  border: 4px solid rgba(255, 255, 255, 0.08);
  border-radius: 50%;
  border-top-color: var(--color-primary);
  animation: spin 1s cubic-bezier(0.5, 0, 0.5, 1) infinite;
}

.spinner-text {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  font-weight: 500;
  letter-spacing: -0.01em;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Premium Video Card styling */
.yt-video-card {
  display: flex;
  min-height: 86px;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.04);
  border-radius: var(--border-radius-md);
  overflow: hidden;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  position: relative;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.yt-video-card:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(99, 102, 241, 0.2);
  transform: translateY(-2px);
  box-shadow: 
    0 8px 25px rgba(0, 0, 0, 0.25),
    0 0 15px rgba(99, 102, 241, 0.08);
}

.yt-video-thumb-wrapper {
  position: relative;
  width: 130px;
  aspect-ratio: 16/9;
  flex-shrink: 0;
  overflow: hidden;
  background: #000;
  border-radius: var(--border-radius-sm);
  margin: 6px;
}

.yt-video-thumb {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.yt-video-card:hover .yt-video-thumb {
  transform: scale(1.03);
}

.yt-video-duration {
  position: absolute;
  bottom: 4px;
  right: 4px;
  background: rgba(0, 0, 0, 0.8);
  color: #fff;
  font-size: 10px;
  font-weight: 700;
  padding: 2px 5px;
  border-radius: 4px;
  letter-spacing: 0.02em;
  backdrop-filter: blur(2px);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.yt-video-info {
  flex: 1;
  padding: var(--spacing-sm) var(--spacing-md);
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-width: 0;
}

.yt-video-title {
  font-size: 13px;
  font-weight: var(--font-weight-semibold);
  color: rgba(255, 255, 255, 0.9);
  line-height: 1.45;
  margin-bottom: 4px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: color 0.2s ease;
}

.yt-video-card:hover .yt-video-title {
  color: #fff;
}

.yt-video-channel {
  font-size: 11px;
  color: rgba(255, 255, 255, 0.4);
  margin-bottom: 2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.yt-video-meta {
  font-size: 10.5px;
  color: rgba(255, 255, 255, 0.25);
  display: flex;
  gap: var(--spacing-xs);
}

.yt-video-actions {
  display: flex;
  align-items: center;
  padding: 0 var(--spacing-md);
}

.yt-video-btn {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: rgba(255, 255, 255, 0.6);
  width: 34px;
  height: 34px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.yt-video-card:hover .yt-video-btn {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  border-color: transparent;
  color: #fff;
  box-shadow: 0 4px 10px rgba(99, 102, 241, 0.35);
  transform: scale(1.08);
}

.yt-video-btn span {
  font-size: 1.1rem;
}

/* Responsive adjustments */
@media (max-width: 768px) {
  /* 유튜브 플레이어 패널 모바일 화면 좌우 여백 파괴 및 무여백(Edge-to-Edge) 밀착 */
  #tabSearchContent .yt-search-player-panel {
    padding: var(--spacing-md) 0 0 0 !important;
    border-left: none !important;
    border-right: none !important;
    border-radius: 0 !important;
    margin-left: calc(var(--spacing-md) * -1) !important;
    margin-right: calc(var(--spacing-md) * -1) !important;
    background: rgba(18, 18, 29, 0.6) !important;
  }
  
  #tabSearchContent .yt-search-player-wrapper {
    border-radius: 0 !important;
    border-left: none !important;
    border-right: none !important;
  }
  
  #tabSearchContent .yt-player-meta-box,
  #tabSearchContent .yt-player-download-options {
    padding: 0 var(--spacing-md) var(--spacing-md) var(--spacing-md) !important;
  }
}

@media (max-width: 480px) {
  .convert-tabs {
    max-width: 100%;
  }
  
  .convert-tab-btn {
    padding: 10px 4px;
    font-size: 13px;
    gap: 4px;
  }

  .convert-tab-btn span {
    font-size: 1.15rem;
  }
  
  .yt-video-thumb-wrapper {
    width: 100px;
    margin: 4px;
  }
  
  .yt-video-info {
    padding: var(--spacing-xs) var(--spacing-sm);
  }
  
  .yt-video-title {
    font-size: 12px;
    line-height: 1.35;
  }
  
  .yt-video-actions {
    padding: 0 var(--spacing-sm);
  }
  
  .yt-video-btn {
    width: 30px;
    height: 30px;
  }
}

/* ==========================================
   유튜브 플레이어 및 다운로드 콤보 패널 스타일
   ========================================== */
.yt-search-player-panel {
  background: rgba(18, 18, 29, 0.45);
  border: 1px solid rgba(255, 255, 255, 0.06);
  backdrop-filter: blur(25px);
  -webkit-backdrop-filter: blur(25px);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-md);
  margin-top: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
  box-shadow: 
    0 15px 35px rgba(0, 0, 0, 0.4),
    inset 0 1px 1px rgba(255, 255, 255, 0.1);
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  overflow: hidden;
}

.yt-search-player-panel::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--color-primary-light), var(--color-primary), transparent);
  opacity: 0.8;
}

.yt-search-player-wrapper {
  position: relative;
  width: 100%;
  aspect-ratio: 16/9;
  border-radius: var(--border-radius-md);
  overflow: hidden;
  background: #000;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.yt-search-player-wrapper iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

.yt-player-close-btn {
  position: absolute;
  top: 10px;
  right: 10px;
  background: rgba(0, 0, 0, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: #fff;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 10;
  transition: all 0.2s ease;
  backdrop-filter: blur(4px);
}

.yt-player-close-btn:hover {
  background: rgba(239, 68, 68, 0.9);
  border-color: transparent;
  transform: scale(1.1);
}

.yt-player-fullscreen-btn {
  position: absolute;
  top: 10px;
  right: 50px;
  background: rgba(0, 0, 0, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: #fff;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 10;
  transition: all 0.2s ease;
  backdrop-filter: blur(4px);
}

.yt-player-fullscreen-btn:hover {
  background: var(--color-primary);
  border-color: transparent;
  transform: scale(1.1);
}

.yt-player-meta-box {
  margin-top: var(--spacing-md);
  padding-bottom: var(--spacing-sm);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.yt-player-title {
  font-size: 15px;
  font-weight: 700;
  color: #fff;
  line-height: 1.4;
  margin-bottom: 4px;
}

.yt-player-channel {
  font-size: 12px;
  color: rgba(255, 255, 255, 0.5);
}

.yt-player-download-options {
  margin-top: var(--spacing-md);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.yt-download-format-group, .yt-download-quality-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.yt-opt-label {
  font-size: 12px;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.4);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* 세그먼티드 알약 칩셋 */
.yt-format-selector-chips, .yt-quality-selector-chips {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.yt-fmt-chip, .yt-quality-chip {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.06);
  color: rgba(255, 255, 255, 0.7);
  padding: 8px 16px;
  border-radius: 30px;
  font-size: 12.5px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.25, 0.8, 0.25, 1);
  display: flex;
  align-items: center;
  gap: 6px;
}

.yt-fmt-chip span, .yt-quality-chip span {
  font-size: 1.1rem;
}

.yt-fmt-chip:hover, .yt-quality-chip:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.15);
  color: #fff;
}

/* 활성 칩셋 효과 */
.yt-fmt-chip.active {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.15), rgba(168, 85, 247, 0.15));
  border-color: rgba(168, 85, 247, 0.4);
  color: #c084fc;
  box-shadow: 0 0 12px rgba(168, 85, 247, 0.15);
}

.yt-quality-chip.active {
  background: linear-gradient(135deg, rgba(34, 197, 94, 0.15), rgba(16, 185, 129, 0.15));
  border-color: rgba(16, 185, 129, 0.5);
  color: #34d399;
  box-shadow: 0 0 12px rgba(16, 185, 129, 0.2);
  position: relative;
}

.yt-quality-chip.active::after {
  content: '';
  position: absolute;
  top: 50%;
  right: 8px;
  transform: translateY(-50%);
  width: 5px;
  height: 5px;
  background: #10b981;
  border-radius: 50%;
  box-shadow: 0 0 6px #10b981;
}

.yt-quality-chip.active {
  padding-right: 20px;
}

.yt-player-action-row {
  margin-top: var(--spacing-sm);
}

.yt-download-submit-btn {
  width: 100%;
  justify-content: center;
  padding: 12px 20px;
  border-radius: 12px;
  font-weight: 700;
  letter-spacing: 0.02em;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light)) !important;
  box-shadow: 0 4px 15px rgba(99, 102, 241, 0.35);
  transition: all 0.25s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.yt-download-submit-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(99, 102, 241, 0.5);
}

/* ==========================================
   유튜브 플레이어 기기 가로 회전(device-landscape) 반응형 극장 모드
   ========================================== */
body.device-landscape.yt-player-active {
  overflow: hidden !important;
  height: 100vh !important;
  width: 100vw !important;
}

body.device-landscape.yt-player-active .yt-search-player-panel {
  position: fixed !important;
  top: 0 !important;
  left: 0 !important;
  width: 100vw !important;
  height: 100vh !important;
  z-index: 999999 !important; /* z-index 최상위 격상 */
  background: #000 !important;
  margin: 0 !important;
  padding: 0 !important;
  border-radius: 0 !important;
  border: none !important;
  backdrop-filter: none !important;
  box-shadow: none !important;
}

body.device-landscape.yt-player-active .yt-search-player-panel::before {
  display: none !important;
}

body.device-landscape.yt-player-active .yt-search-player-wrapper {
  position: fixed !important;
  top: 0 !important;
  left: 0 !important;
  width: 100vw !important;
  height: 100vh !important;
  z-index: 1000000 !important; /* 최상위 래퍼 격상 */
  margin: 0 !important;
  border-radius: 0 !important;
  border: none !important;
  box-shadow: none !important;
  aspect-ratio: auto !important;
}

body.device-landscape.yt-player-active .yt-search-player-wrapper iframe {
  width: 100% !important;
  height: 100% !important;
  border: none !important;
}

body.device-landscape.yt-player-active .yt-player-close-btn {
  top: 15px;
  right: 15px;
  width: 42px;
  height: 42px;
  background: rgba(0, 0, 0, 0.7);
  border-color: rgba(255, 255, 255, 0.2);
}

body.device-landscape.yt-player-active .yt-player-fullscreen-btn {
  top: 15px;
  right: 65px;
  width: 42px;
  height: 42px;
  background: rgba(0, 0, 0, 0.7);
  border-color: rgba(255, 255, 255, 0.2);
}

body.device-landscape.yt-player-active .yt-player-close-btn span,
body.device-landscape.yt-player-active .yt-player-fullscreen-btn span {
  font-size: 1.6rem;
}

/* 가로 모드 극장 뷰 상태에서는 하단 정보/옵션을 감추어 화면 전체 활용 극대화 */
body.device-landscape.yt-player-active .yt-player-meta-box,
body.device-landscape.yt-player-active .yt-player-download-options {
  display: none !important;
}

body.device-landscape.yt-player-active .container {
  padding-top: 0 !important;
}

/* ==========================================
   유튜브 플레이어 브라우저 극장 풀스크린 가득 찬 화면 (yt-player-fullscreen)
   ========================================== */
body.yt-player-fullscreen .yt-search-player-panel {
  position: fixed !important;
  top: 0 !important;
  left: 0 !important;
  width: 100vw !important;
  height: 100vh !important;
  z-index: 99999 !important;
  background: #000 !important;
  margin: 0 !important;
  padding: 0 !important;
  border-radius: 0 !important;
  border: none !important;
  box-shadow: none !important;
  backdrop-filter: none !important;
}

body.yt-player-fullscreen .yt-search-player-panel::before {
  display: none !important;
}

body.yt-player-fullscreen .yt-search-player-wrapper {
  position: fixed !important;
  top: 0 !important;
  left: 0 !important;
  width: 100vw !important;
  height: 100vh !important;
  z-index: 100000 !important;
  margin: 0 !important;
  border-radius: 0 !important;
  border: none !important;
  box-shadow: none !important;
  aspect-ratio: auto !important;
}

body.yt-player-fullscreen .yt-player-close-btn {
  position: fixed !important;
  top: 20px !important;
  right: 20px !important;
  width: 44px !important;
  height: 44px !important;
  z-index: 100001 !important;
  background: rgba(0, 0, 0, 0.75) !important;
  border: 1px solid rgba(255, 255, 255, 0.25) !important;
}

body.yt-player-fullscreen .yt-player-fullscreen-btn {
  position: fixed !important;
  top: 20px !important;
  right: 74px !important;
  width: 44px !important;
  height: 44px !important;
  z-index: 100001 !important;
  background: rgba(0, 0, 0, 0.75) !important;
  border: 1px solid rgba(255, 255, 255, 0.25) !important;
}

body.yt-player-fullscreen .yt-player-close-btn span,
body.yt-player-fullscreen .yt-player-fullscreen-btn span {
  font-size: 1.7rem !important;
}

body.yt-player-fullscreen .yt-player-meta-box,
body.yt-player-fullscreen .yt-player-download-options {
  display: none !important;
}


/* 프리미엄 로딩 회전 동기화 애니메이션 */
@keyframes rotate {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}
.spinner-rotate {
  animation: rotate 1.5s linear infinite;
  display: inline-block;
}

/* 다이내믹 반복 재생 버튼 프리미엄 스타일 보정 */
#playerRepeatBtn {
  position: relative;
  transition: all var(--transition-fast);
  color: var(--color-text-secondary);
}
#playerRepeatBtn:hover {
  transform: scale(1.15);
  color: var(--color-text-primary);
  background: rgba(255, 255, 255, 0.15);
  box-shadow: 0 0 12px rgba(255, 255, 255, 0.1);
}
#playerRepeatBtn.active {
  color: var(--color-primary-light) !important;
  border-color: var(--color-primary-light) !important;
  background: rgba(99, 102, 241, 0.12) !important;
  text-shadow: 0 0 8px rgba(129, 140, 248, 0.6);
  box-shadow: 0 0 12px rgba(99, 102, 241, 0.3) !important;
  transform: scale(1.05);
}
#playerRepeatBtn.active:hover {
  transform: scale(1.15);
  box-shadow: 0 0 18px rgba(99, 102, 241, 0.5) !important;
}

/* ==========================================
   일반 가로 모드(device-landscape) 2분할 듀얼 패널 레이아웃
   JavaScript 클래스 방식 + CSS 미디어쿼리 이중 보장
   ========================================== */

/* ---------- JS 클래스 방식 (더 세밀한 제어) ---------- */
body.device-landscape:not(.yt-player-active):not(.yt-player-fullscreen) {
  padding-bottom: calc(var(--player-height) + var(--spacing-md));
  overflow-y: auto;
}

body.device-landscape:not(.yt-player-active):not(.yt-player-fullscreen) .container {
  max-width: 1280px;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  grid-template-rows: auto 1fr;
  gap: 0 var(--spacing-xl);
  grid-template-areas:
    "header library"
    "convert library";
  align-items: start;
}

body.device-landscape:not(.yt-player-active):not(.yt-player-fullscreen) .header {
  grid-area: header;
  padding: var(--spacing-md) 0 var(--spacing-xs) 0;
}

body.device-landscape:not(.yt-player-active):not(.yt-player-fullscreen) .convert-section {
  grid-area: convert;
  margin-bottom: 0;
  padding: var(--spacing-lg);
}

body.device-landscape:not(.yt-player-active):not(.yt-player-fullscreen) .library-section {
  grid-area: library;
  margin-bottom: 0;
  padding-top: var(--spacing-md);
  position: sticky;
  top: 0;
}

/* 가로 모드 시 세로 폭 절약을 위한 리스트 최대 높이 및 오버플로우 한정 */
body.device-landscape:not(.yt-player-active):not(.yt-player-fullscreen) .track-grid {
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: var(--spacing-sm);
  max-height: calc(100vh - var(--player-height) - 180px);
  overflow-y: auto;
  padding-right: 4px;
}

/* 유튜브 검색 결과 리스트도 가로 모드 시 화면에 꼭 맞게 제한 */
body.device-landscape:not(.yt-player-active):not(.yt-player-fullscreen) .yt-search-results {
  max-height: 220px;
}

/* 폴더 선택 모달 리스트 등 콤팩트화 */
body.device-landscape:not(.yt-player-active):not(.yt-player-fullscreen) .folder-select-list {
  max-height: 180px;
}

/* ---------- CSS 미디어쿼리 방식 (JS 클래스보다 먼저 반응, 즉각 이중 보장) ---------- */
/* 유튜브 재생 및 풀스크린 상태가 아닌 일반 가로 모드 */
@media (orientation: landscape) {
  /* 유튜브 극장 모드 / 풀스크린 클래스가 없는 경우에만 일반 가로 레이아웃 */
  body:not(.yt-player-active):not(.yt-player-fullscreen) {
    padding-bottom: calc(var(--player-height) + var(--spacing-md));
    overflow-y: auto;
  }

  body:not(.yt-player-active):not(.yt-player-fullscreen) .container {
    max-width: 1280px;
    display: grid;
    grid-template-columns: 1.15fr 0.85fr;
    grid-template-rows: auto 1fr;
    gap: 0 var(--spacing-xl);
    grid-template-areas:
      "header library"
      "convert library";
    align-items: start;
  }

  body:not(.yt-player-active):not(.yt-player-fullscreen) .header {
    grid-area: header;
    padding: var(--spacing-md) 0 var(--spacing-xs) 0;
  }

  body:not(.yt-player-active):not(.yt-player-fullscreen) .convert-section {
    grid-area: convert;
    margin-bottom: 0;
    padding: var(--spacing-lg);
  }

  body:not(.yt-player-active):not(.yt-player-fullscreen) .library-section {
    grid-area: library;
    margin-bottom: 0;
    padding-top: var(--spacing-md);
    position: sticky;
    top: 0;
  }

  body:not(.yt-player-active):not(.yt-player-fullscreen) .track-grid {
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: var(--spacing-sm);
    max-height: calc(100vh - var(--player-height) - 180px);
    overflow-y: auto;
    padding-right: 4px;
  }

  body:not(.yt-player-active):not(.yt-player-fullscreen) .yt-search-results {
    max-height: 220px;
  }

  body:not(.yt-player-active):not(.yt-player-fullscreen) .folder-select-list {
    max-height: 180px;
  }

  /* 기존 가로 모드 로컬 비디오 오버레이 규칙과 충돌 방지 */
  body.yt-player-active .container,
  body.yt-player-fullscreen .container {
    display: block;
    max-width: 860px;
  }
}

/* ---------- 세로 모드 복귀 시 강제 초기화 ---------- */
@media (orientation: portrait) {
  .container {
    display: block !important;
    max-width: 860px !important;
  }
  .header {
    grid-area: unset !important;
  }
  .convert-section {
    grid-area: unset !important;
    margin-bottom: var(--spacing-xl) !important;
  }
  .library-section {
    grid-area: unset !important;
    position: static !important;
  }
  .track-grid {
    max-height: none !important;
    overflow-y: visible !important;
  }
  .yt-search-results {
    max-height: 440px !important;
  }
}

/* ===== 헤더 액션 영역 & 설치/Go CCM 버튼 ===== */
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

/* PWA 설치 버튼 */
.btn-install {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.3);
  color: var(--color-success);
  padding: 6px 12px;
  border-radius: var(--radius-full);
  font-family: var(--font-main);
  font-size: var(--font-size-xs);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  user-select: none;
  -webkit-user-select: none;
}
.btn-install:hover {
  background: rgba(16, 185, 129, 0.2);
  border-color: var(--color-success);
  transform: translateY(-1px);
}
.btn-install:active {
  transform: translateY(0);
}
.btn-install .material-symbols-rounded {
  font-size: 1rem;
}

/* Go CCM 버튼 (강조 애니메이션 적용) */
.btn-go-ccm {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: linear-gradient(135deg, var(--color-accent), var(--color-secondary));
  border: none;
  color: #fff;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  font-family: var(--font-main);
  font-size: var(--font-size-xs);
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition-fast);
  box-shadow: 0 2px 8px rgba(236, 72, 153, 0.3);
  user-select: none;
  -webkit-user-select: none;
}
.btn-go-ccm:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(236, 72, 153, 0.5);
}
.btn-go-ccm:active {
  transform: translateY(0);
}
.btn-go-ccm .material-symbols-rounded {
  font-size: 1rem;
  animation: shine 2s infinite alternate;
}

@keyframes shine {
  0% { transform: scale(1); filter: drop-shadow(0 0 1px #fff); }
  100% { transform: scale(1.1); filter: drop-shadow(0 0 4px #fff); }
}

@media (max-width: 480px) {
  .btn-install .install-text {
    display: none; /* 모바일 크기에서는 '설치' 텍스트를 숨기고 아이콘만 깜찍하게 노출 */
  }
  .btn-install {
    padding: 6px;
  }
}

/* ===== CCM 찬양 보관함 전체화면 오버레이 ===== */
.ccm-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: #06060f;
  z-index: 10000;
  display: flex;
  flex-direction: column;
  animation: fadeInOverlay 0.3s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes fadeInOverlay {
  from { opacity: 0; transform: scale(1.05); }
  to { opacity: 1; transform: scale(1); }
}

.ccm-header {
  height: 60px;
  min-height: 60px;
  background: rgba(255, 255, 255, 0.03);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--spacing-lg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  user-select: none;
  -webkit-user-select: none;
}

.ccm-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  color: #fff;
}

.ccm-logo .material-symbols-rounded {
  color: var(--color-accent);
  font-size: 1.4rem;
}

.ccm-title {
  font-weight: 700;
  font-size: var(--font-size-base);
  letter-spacing: -0.01em;
}

.close-ccm-btn {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.close-ccm-btn:hover {
  background: rgba(255, 255, 255, 0.15);
  color: #fff;
  transform: rotate(90deg);
}

.ccm-iframe-wrapper {
  flex: 1;
  width: 100%;
  position: relative;
  background: #000;
  overflow: hidden;
}

#ccmFrame {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
}