:root {
  --bg-main: #f8fafc; --bg-surface: #ffffff; --bg-glass: rgba(255, 255, 255, 0.95);
  --text-main: #0f172a; --text-muted: #64748b;
  --primary: #2563eb; --primary-glow: rgba(37, 99, 235, 0.2);
  --accent: #0ea5e9; --danger: #ef4444;
  --font-main: 'Kanit', sans-serif; --font-lyrics: 'Nanum Myeongjo', serif; 
  --radius-ui: 16px; --pad-ui: 20px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
[data-theme="light"] { --bg-main: #f1f5f9; --bg-surface: #ffffff; --bg-glass: rgba(255, 255, 255, 0.95); --text-main: #0f172a; --text-muted: #64748b; }
[data-theme="dark"] { --bg-main: #0f172a; --bg-surface: #1e293b; --bg-glass: rgba(30, 41, 59, 0.95); --text-main: #f8fafc; --text-muted: #94a3b8; }
* { margin: 0; padding: 0; box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
body { background-color: var(--bg-main); color: var(--text-main); font-family: var(--font-main); font-size: 16px; transition: var(--transition); overflow-x: hidden; }
.container { max-width: 900px; margin: 0 auto; padding: 20px; padding-bottom: 100px;}
h1, h2, h3, h4 { font-weight: 600; letter-spacing: -0.5px; }

.auth-wrapper { display: flex; flex-direction: column; justify-content: center; align-items: center; min-height: 100vh; padding: 20px; background: var(--bg-main); }
.auth-card { background: var(--bg-surface); padding: 40px 30px; border-radius: var(--radius-ui); box-shadow: 0 10px 30px rgba(0,0,0,0.05); width: 100%; max-width: 400px; text-align: center; border: 1px solid #e2e8f0; animation: fadeInDown 0.4s ease; }
.auth-icon { font-size: 4rem; color: var(--primary); margin-bottom: 15px; }
.auth-title { font-size: 1.8rem; margin-bottom: 5px; background: linear-gradient(45deg, var(--primary), var(--accent)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.auth-desc { color: var(--text-muted); font-size: 0.9rem; margin-bottom: 25px; }

.auth-tabs { display: flex; background: #f1f5f9; border-radius: 50px; padding: 4px; margin-bottom: 25px; width: 100%; }
.auth-tab-btn { flex: 1; padding: 10px 15px; border-radius: 50px; border: none; background: transparent; font-family: var(--font-main); font-size: 0.95rem; font-weight: 600; color: #64748b; cursor: pointer; transition: var(--transition); }
.auth-tab-btn.active { background: white; color: var(--primary); box-shadow: 0 4px 10px rgba(0,0,0,0.05); }

.search-container { position: relative; margin-bottom: 15px; }
.search-container i { position: absolute; left: 16px; top: 50%; transform: translateY(-50%); color: var(--text-muted); font-size: 1.2rem; }
input[type="text"], input[type="password"], input[type="tel"], input[type="date"], input[type="number"], select, textarea { width: 100%; padding: 16px 16px 16px 48px; background: var(--bg-surface); color: var(--text-main); border: 1px solid #e2e8f0; border-radius: var(--radius-ui); font-family: var(--font-main); font-size: 1rem; box-shadow: 0 2px 4px rgba(0,0,0,0.02); transition: var(--transition); outline: none; }
input[type="number"] { padding: 16px; }
input[type="file"] { width: 100%; padding: 12px; background: #f1f5f9; border: 1px dashed var(--primary); border-radius: 12px; font-family: var(--font-main); font-size: 0.9rem; cursor: pointer;}
input:focus, select:focus, textarea:focus { box-shadow: 0 0 0 2px var(--primary), 0 0 15px var(--primary-glow); border-color: var(--primary); }
.form-group input, .form-group select, .form-group textarea { padding-left: 16px; margin-bottom: 15px;}

.slip-preview { width: 100%; height: 200px; border-radius: 12px; object-fit: contain; margin-top: 10px; display: none; border: 1px solid #e2e8f0; background: #f8fafc;}

.editor-toolbar { display: flex; flex-wrap: wrap; gap: 5px; background: #f1f5f9; padding: 10px; border: 1px solid #e2e8f0; border-bottom: none; border-radius: var(--radius-ui) var(--radius-ui) 0 0; align-items: center; }
.editor-btn { background: white; border: 1px solid #cbd5e1; border-radius: 6px; width: 35px; height: 35px; cursor: pointer; display: flex; justify-content: center; align-items: center; color: #475569; transition: var(--transition); }
.editor-btn:hover { background: var(--primary); color: white; border-color: var(--primary); }
.editor-divider { width: 1px; height: 25px; background: #cbd5e1; margin: 0 5px; }
.editor-select { height: 35px; border-radius: 6px; border: 1px solid #cbd5e1; padding: 0 10px; font-family: var(--font-main); color: #475569; outline: none; cursor: pointer; }
.rich-editor { width: 100%; min-height: 250px; background: var(--bg-surface); color: var(--text-main); border: 1px solid #e2e8f0; border-radius: 0 0 var(--radius-ui) var(--radius-ui); padding: 20px; font-family: var(--font-lyrics); font-size: 1.2rem; outline: none; overflow-y: auto; transition: var(--transition); margin-bottom: 20px;}
.rich-editor:focus { box-shadow: 0 0 0 2px var(--primary), 0 0 15px var(--primary-glow); border-color: var(--primary); }

.hero-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 20px; margin-top: 10px; }
.hero-header h1 { font-size: 1.8rem; background: linear-gradient(45deg, var(--primary), var(--accent)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }

.lang-switcher { display: flex; background: #e2e8f0; border-radius: 50px; padding: 4px; margin-bottom: 25px; width: fit-content; }
.lang-btn { padding: 6px 15px; border-radius: 50px; border: none; background: transparent; font-family: var(--font-main); font-size: 0.85rem; font-weight: 600; color: #64748b; cursor: pointer; transition: var(--transition); }
.lang-btn.active { background: var(--primary); color: white; box-shadow: 0 4px 10px rgba(37,99,235,0.3); }

.all-songs-card { display: flex; justify-content: space-between; align-items: center; background: linear-gradient(135deg, var(--primary) 0%, #1e40af 100%); color: white; padding: 20px var(--pad-ui); border-radius: var(--radius-ui); font-size: 1.1rem; font-weight: 600; box-shadow: 0 10px 20px rgba(37,99,235,0.2); margin-bottom: 25px; cursor: pointer; transition: var(--transition); }
.all-songs-card:active { transform: scale(0.97); }
.all-songs-card .icon-box { background: rgba(255,255,255,0.2); width: 45px; height: 45px; border-radius: 12px; display: flex; justify-content: center; align-items: center; font-size: 1.5rem; margin-right: 15px; }
.all-songs-card .total-num { font-size: 1.8rem; font-weight: 700; background: rgba(0,0,0,0.2); padding: 5px 15px; border-radius: 30px; }

.grid-cats { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 16px; margin-bottom: 20px; }
.cat-card { position: relative; overflow: hidden; border-radius: var(--radius-ui); padding: var(--pad-ui); color: white; cursor: pointer; display: flex; flex-direction: column; justify-content: space-between; min-height: 120px; transition: transform 0.3s ease, box-shadow 0.3s ease; box-shadow: 0 4px 10px rgba(0,0,0,0.1); }
.cat-card:active { transform: scale(0.95); }
.cat-card i { font-size: 2rem; opacity: 0.8; margin-bottom: 10px; }
.cat-card h3 { font-size: 1.1rem; line-height: 1.3; z-index: 1; }
.cat-card .count { font-size: 0.85rem; opacity: 0.9; margin-top: 5px; z-index: 1; background: rgba(0,0,0,0.2); display: inline-block; padding: 2px 8px; border-radius: 10px;}

.bg-g1 { background: linear-gradient(135deg, #FF9A9E 0%, #FECFEF 99%, #FECFEF 100%); color:#333; }
.bg-g2 { background: linear-gradient(135deg, #667EEA 0%, #764BA2 100%); }
.bg-g3 { background: linear-gradient(135deg, #0BA360 0%, #3CB100 100%); }
.bg-g4 { background: linear-gradient(135deg, #16A085 0%, #F4D03F 100%); }
.bg-g5 { background: linear-gradient(135deg, #FF0844 0%, #FFB199 100%); }
.bg-g6 { background: linear-gradient(135deg, #B224EF 0%, #7579FF 100%); }
.bg-g7 { background: linear-gradient(135deg, #4FACFE 0%, #00F2FE 100%); }
.bg-g8 { background: linear-gradient(135deg, #434343 0%, #000000 100%); }

.top-bar { display: flex; align-items: center; gap: 10px; margin-bottom: 10px; position: sticky; top: 0; background: var(--bg-main); z-index: 10; padding: 10px 0; justify-content: space-between;}
.btn-icon { background: var(--bg-surface); border: 1px solid #e2e8f0; color: var(--text-main); width: 45px; height: 45px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 1.2rem; cursor: pointer; box-shadow: 0 4px 10px rgba(0,0,0,0.03); transition: var(--transition); flex-shrink: 0;}
.btn-icon:active { transform: scale(0.9); }

.controls-wrapper { display: none; flex-wrap: wrap; gap: 8px; justify-content: space-between; background: var(--bg-surface); padding: 15px; border-radius: var(--radius-ui); box-shadow: 0 4px 15px rgba(0,0,0,0.05); margin-bottom: 20px; animation: fadeInDown 0.3s ease; border: 1px solid #e2e8f0;}
.controls-wrapper.show { display: flex; }
@keyframes fadeInDown { from { opacity: 0; transform: translateY(-10px); } to { opacity: 1; transform: translateY(0); } }
.control-group { display: flex; gap: 2px; background: #f1f5f9; border-radius: 25px; padding: 5px; flex: 1; justify-content: space-around;}
.control-group .btn-icon { width: 35px; height: 35px; font-size: 0.9rem; box-shadow: none; border-radius: 18px; border: none; }
.control-group .btn-icon.active-align { background: var(--primary); color: white; }
.control-group .c-label { display:flex; align-items:center; padding: 0 8px; font-size: 0.75rem; color: var(--text-muted); font-weight:600;}

.lyrics-toggle { display: flex; background: #f1f5f9; border-radius: 8px; padding: 4px; margin: 15px auto; width: fit-content; }
.lyrics-toggle-btn { padding: 8px 20px; border: none; background: transparent; border-radius: 6px; font-family: var(--font-main); font-weight: 600; color: var(--text-muted); cursor: pointer; transition: var(--transition); }
.lyrics-toggle-btn.active { background: white; color: var(--primary); box-shadow: 0 2px 8px rgba(0,0,0,0.05); }

.song-item { display: flex; align-items: center; gap: 15px; background: var(--bg-surface); padding: var(--pad-ui); margin-bottom: 10px; border-radius: var(--radius-ui); cursor: pointer; transition: var(--transition); box-shadow: 0 2px 8px rgba(0,0,0,0.03); border: 1px solid #f1f5f9; }
.song-item:hover { transform: translateX(5px); border-left: 4px solid var(--primary); }
.song-item .s-id { font-weight: 700; color: var(--primary); width: 45px; font-size: 1.1rem; }
.song-item .s-info { flex: 1; min-width: 0;}
.song-item .s-title { font-size: 1.1rem; font-weight: 500; margin-bottom: 2px; color: var(--text-main); white-space: nowrap; overflow: hidden; text-overflow: ellipsis;}
.song-item .s-eng-title { font-size: 0.85rem; color: var(--text-muted); font-style: italic; margin-bottom: 4px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis;}
.song-item .s-meta { font-size: 0.8rem; color: #94a3b8; }

.quick-cat-select { margin-top: 8px; padding: 4px 8px; border-radius: 6px; border: 1px solid #cbd5e1; font-family: var(--font-main); font-size: 0.8rem; color: var(--primary); background: rgba(37, 99, 235, 0.05); max-width: 150px; outline: none; cursor: pointer; }
.quick-actions { display: flex; gap: 8px; margin-left: 10px; }
.btn-quick { width: 35px; height: 35px; border-radius: 8px; border: none; font-size: 0.9rem; cursor: pointer; transition: var(--transition); display: flex; justify-content: center; align-items: center; }
.btn-quick.edit { background: rgba(245, 158, 11, 0.15); color: #f59e0b; }
.btn-quick.del { background: rgba(239, 68, 68, 0.15); color: var(--danger); }

.reader-card { background: var(--bg-surface); border-radius: var(--radius-ui); padding: 30px var(--pad-ui); box-shadow: 0 10px 30px rgba(0,0,0,0.05); margin-top: 5px; border: 1px solid #e2e8f0; }
.reader-header { text-align: center; margin-bottom: 20px; }
.reader-title { font-size: 1.4rem; color: var(--primary); margin-bottom: 2px; }
.reader-eng-title { font-size: 0.95rem; color: var(--text-muted); font-weight: 400; font-style: italic; margin-bottom: 10px; }
.reader-meta { font-size: 0.75rem; color: var(--text-muted); opacity: 0.8; margin-bottom: 15px; display: flex; justify-content: center; gap: 15px; }

.tags-wrapper { display: flex; flex-direction: column; align-items: center; gap: 8px; margin-bottom: 25px; }
.reader-chords { background: rgba(239, 68, 68, 0.1); color: var(--danger); padding: 4px 12px; border-radius: 6px; font-weight: 500; font-size: 0.85rem; display: inline-block;}
.reader-notation { background: rgba(59, 130, 246, 0.1); color: var(--accent); padding: 6px 12px; border-radius: 6px; font-weight: 500; font-family: monospace; font-size: 0.85rem; display: inline-block; line-height: 1.3;}

.song-image-box { text-align: center; margin-bottom: 20px; }
.song-image-box img { max-width: 100%; border-radius: 10px; box-shadow: 0 4px 10px rgba(0,0,0,0.1); }

.reader-lyrics { font-family: var(--font-lyrics); font-size: 1.2rem; line-height: 2.0; text-align: center; white-space: pre-wrap; padding: 0 10px; transition: font-size 0.2s, line-height 0.2s; color: var(--text-main); }
.reader-lyrics * { font-family: inherit; } 

.reader-inspiration { background: #f1f5f9; border-left: 4px solid var(--primary); padding: 15px; margin-top: 40px; border-radius: 0 10px 10px 0; color: var(--text-muted); font-size: 0.9rem !important; font-style: italic; line-height: 1.6; }
.media-box { margin-top: 25px; padding-top: 20px; border-top: 1px dashed #e2e8f0; text-align: center; }
audio { width: 100%; outline: none; border-radius: 50px; height: 45px; }
.btn-link { display: inline-block; background: var(--accent); color: white; padding: 10px 20px; border-radius: 50px; text-decoration: none; font-size: 0.9rem; font-weight: 600; margin-top: 10px; box-shadow: 0 4px 10px rgba(59, 130, 246, 0.2); }

.btn-primary { background: var(--primary); color: white; border: none; padding: 15px 24px; border-radius: var(--radius-ui); font-size: 1.1rem; font-family: var(--font-main); font-weight: 600; cursor: pointer; box-shadow: 0 4px 15px var(--primary-glow); transition: var(--transition); }
.btn-primary:active { transform: scale(0.98); }

.bottom-nav { position: fixed; bottom: 15px; left: 50%; transform: translateX(-50%); width: 90%; max-width: 600px; height: 70px; background: var(--bg-glass); backdrop-filter: blur(15px); -webkit-backdrop-filter: blur(15px); border-radius: 35px; box-shadow: 0 10px 40px rgba(0,0,0,0.1); border: 1px solid #e2e8f0; display: flex; align-items: center; justify-content: space-around; z-index: 100; overflow:hidden;}
.nav-scroll-area { display: flex; overflow-x: auto; gap: 10px; width: 100%; padding: 0 15px; scrollbar-width: none; -ms-overflow-style: none; align-items: center;}
.nav-scroll-area::-webkit-scrollbar { display: none; }
.nav-item { display: flex; flex-direction: column; align-items: center; justify-content: center; color: var(--text-muted); cursor: pointer; transition: var(--transition); flex-shrink: 0; width: 60px; height: 100%; }
.nav-item i { font-size: 1.3rem; transition: var(--transition); margin-bottom: 2px;}
.nav-item span { font-size: 0.65rem; font-weight: 500; text-align:center;}
.nav-item.active { color: var(--primary); }
.nav-item.active i { transform: translateY(-3px); }

.loader-container { height: 100vh; display: flex; flex-direction: column; justify-content: center; align-items: center; color: var(--primary); background: var(--bg-main); z-index: 9999; position: fixed; top: 0; left: 0; width: 100%;}
.spinner { width: 50px; height: 50px; border: 4px solid rgba(37, 99, 235, 0.2); border-top-color: var(--primary); border-radius: 50%; animation: spin 1s linear infinite; margin-bottom: 20px; }
@keyframes spin { to { transform: rotate(360deg); } }

.modal-overlay { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0, 0, 0, 0.6); backdrop-filter: blur(8px); display: flex; align-items: center; justify-content: center; z-index: 2000; opacity: 0; visibility: hidden; transition: all 0.3s ease; }
.modal-overlay.show { opacity: 1; visibility: visible; }
.modal-box { background: var(--bg-surface); padding: 30px; border-radius: var(--radius-ui); width: 90%; max-width: 350px; text-align: center; box-shadow: 0 20px 50px rgba(0,0,0,0.5); transform: translateY(20px); transition: transform 0.3s ease; }
.modal-overlay.show .modal-box { transform: translateY(0); }
.modal-actions { display: flex; gap: 10px; margin-top: 10px;}
.modal-actions button { flex: 1; padding: 12px; border-radius: 10px; font-family: var(--font-main); font-size: 1rem; font-weight: 600; cursor: pointer; border: none; }
.btn-cancel { background: #f1f5f9; color: var(--text-main); }
.btn-confirm { background: var(--primary); color: white; }

.toast { position: fixed; top: -100px; left: 50%; transform: translateX(-50%); background: var(--primary); color: white; padding: 12px 24px; border-radius: 50px; font-weight: 500; z-index: 3000; display: flex; align-items: center; gap: 10px; transition: all 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55); box-shadow: 0 10px 20px rgba(37,99,235,0.3);}
.toast.show { top: 30px; }
.hidden { display: none !important; }
.fade-in { animation: fadeIn 0.4s ease forwards; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }

.admin-form-grid { display: flex; flex-direction: column; gap: 0; }
@media (min-width: 768px) {
  .admin-form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 30px; }
  .admin-form-grid .form-col-right { border-left: 1px dashed #e2e8f0; padding-left: 30px; }
  .pc-hidden-hr { display: none; } 
}