@import "https://fonts.googleapis.com/css2?family=Noto+Sans+KR:wght@300;400;500;700;900&family=Inter:wght@300;400;500;600;700;800&display=swap";:root{--primary:#c0392b;--primary-light:#e74c3c;--primary-dark:#96281b;--accent:#2471a3;--accent-light:#3498db;--accent-dark:#1a5276;--gold:#d4ac0d;--gold-dark:#b8960c;--success:#27ae60;--success-light:#1e8449;--warning:#e67e22;--locked:#9ca3af;--bg-base:#f5f7ff;--bg-surface:#fff;--bg-card:#fff;--bg-card-hover:#f0f4ff;--bg-elevated:#eef2ff;--bg-modal:#0f14328c;--text-primary:#1a1a2e;--text-secondary:#4a5568;--text-muted:#9ca3af;--text-korean:#1a1a2e;--border:#00000014;--border-accent:#c0392b4d;--border-focus:#3498db80;--radius-sm:8px;--radius-md:14px;--radius-lg:20px;--radius-xl:28px;--radius-full:9999px;--shadow-sm:0 1px 4px #00000014, 0 2px 8px #0000000a;--shadow-md:0 4px 16px #0000001a, 0 1px 4px #0000000f;--shadow-lg:0 8px 32px #0000001f, 0 2px 8px #0000000f;--shadow-glow-red:0 4px 20px #c0392b40;--shadow-glow-blue:0 4px 20px #2471a340;--shadow-glow-gold:0 4px 20px #d4ac0d4d;--nav-width:260px;--topbar-height:64px;--transition:all .25s cubic-bezier(.4, 0, .2, 1)}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth;font-size:16px}body{background:var(--bg-base);color:var(--text-primary);-webkit-font-smoothing:antialiased;min-height:100vh;font-family:Inter,Noto Sans KR,sans-serif;line-height:1.6;-webkit-user-select:none!important;user-select:none!important;-webkit-touch-callout:none!important}input,textarea,[contenteditable=true]{-webkit-user-select:text!important;user-select:text!important}@media print{body{display:none!important}}button{cursor:pointer;background:0 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.logo-text{letter-spacing:-.5px;font-size:22px;font-weight:800}.sidebar-logo .logo-text span{color:var(--primary-light)}.sidebar-logo .logo-sub{color:var(--text-muted);text-transform:uppercase;letter-spacing:1px;white-space:nowrap;margin-top:1px;font-size:10px;font-weight:600}.sidebar-nav{flex-direction:column;flex:1;gap:4px;padding:16px 12px;display:flex;overflow-y:auto}.nav-label{text-transform:uppercase;letter-spacing:1.5px;color:var(--text-muted);margin-top:8px;padding:8px 8px 4px;font-size:10px;font-weight:700}.nav-item{border-radius:var(--radius-md);color:var(--text-secondary);transition:var(--transition);align-items:center;gap:12px;padding:12px 14px;font-size:14px;font-weight:500;display:flex;position:relative;overflow:hidden}.nav-item:hover{color:var(--primary);background:#fff0ee}.nav-item.active{color:var(--primary);background:linear-gradient(135deg,#c0392b1a,#2471a312);border:1.5px solid #c0392b33;font-weight:700}.nav-item.active:before{content:"";background:linear-gradient(to bottom, var(--primary), var(--accent));border-radius:0 2px 2px 0;width:3px;position:absolute;top:20%;bottom:20%;left:0}.nav-item .nav-icon{flex-shrink:0;font-size:18px}.nav-item .nav-badge{background:var(--primary);color:#fff;border-radius:var(--radius-full);margin-left:auto;padding:2px 7px;font-size:10px;font-weight:700}.sidebar-footer{border-top:2px solid #0000000f;padding:16px 12px}.sidebar-progress{background:var(--bg-elevated);border-radius:var(--radius-md);padding:14px}.sidebar-progress .sp-label{color:var(--text-muted);justify-content:space-between;margin-bottom:8px;font-size:11px;display:flex}.sidebar-progress .sp-label span{color:var(--primary);font-weight:700}.progress-bar-bg{background:#00000014;border-radius:3px;height:6px;overflow:hidden}.progress-bar-fill{background:linear-gradient(90deg, var(--primary), var(--accent));border-radius:3px;height:100%;transition:width .6s cubic-bezier(.4,0,.2,1)}.main-content{margin-left:var(--nav-width);flex-direction:column;flex:1;min-height:100vh;display:flex}.topbar{height:var(--topbar-height);z-index:90;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);background:#ffffffe6;border-bottom:1px solid #00000012;justify-content:space-between;align-items:center;padding:0 28px;display:flex;position:sticky;top:0;box-shadow:0 1px 8px #0000000f}.topbar-title{color:var(--text-primary);font-size:18px;font-weight:700}.topbar-title span{color:var(--primary)}.topbar-actions{align-items:center;gap:12px;display:flex}.page-body{flex:1;width:100%;max-width:1100px;margin:0 auto;padding:28px}.card{background:var(--bg-card);border-radius:var(--radius-lg);transition:var(--transition);box-shadow:var(--shadow-sm);border:1px solid #00000012;padding:24px}.card:hover{box-shadow:var(--shadow-md);border-color:#c0392b40;transform:translateY(-1px)}.card-glow{box-shadow:var(--shadow-glow-red)}.btn{border-radius:var(--radius-md);transition:var(--transition);cursor:pointer;border:none;justify-content:center;align-items:center;gap:8px;padding:12px 24px;font-family:inherit;font-size:14px;font-weight:600;display:inline-flex}.btn-primary{background:linear-gradient(135deg, var(--primary), var(--primary-dark));color:#fff;box-shadow:var(--shadow-md)}.btn-primary:hover{background:linear-gradient(135deg, var(--primary-light), var(--primary));box-shadow:var(--shadow-glow-red);transform:translateY(-1px)}.btn-secondary{color:var(--text-primary);background:#fff;border:1.5px solid #0000001f;box-shadow:0 1px 4px #0000000f}.btn-secondary:hover{background:var(--bg-card-hover);border-color:var(--accent)}.btn-accent{background:linear-gradient(135deg, var(--accent), var(--accent-dark));color:#fff}.btn-accent:hover{box-shadow:var(--shadow-glow-blue);transform:translateY(-1px)}.btn-gold{background:linear-gradient(135deg, var(--gold), var(--gold-dark));color:#fff;font-weight:700}.btn-gold:hover{box-shadow:var(--shadow-glow-gold);transform:translateY(-1px)}.btn-sm{border-radius:var(--radius-sm);padding:8px 16px;font-size:12px}.btn-lg{border-radius:var(--radius-lg);padding:16px 32px;font-size:16px}.btn-full{width:100%}.btn:disabled{opacity:.4;cursor:not-allowed;transform:none!important}.btn-icon{border-radius:var(--radius-md);background:var(--bg-elevated);width:42px;height:42px;color:var(--text-secondary);border:1px solid var(--border);padding:0}.btn-icon:hover{background:var(--bg-card-hover);color:var(--text-primary);border-color:var(--accent)}.badge{border-radius:var(--radius-full);text-transform:uppercase;letter-spacing:.5px;align-items:center;gap:4px;padding:4px 10px;font-size:11px;font-weight:700;display:inline-flex}.badge-success{color:var(--success-light);background:#27ae6033}.badge-warning{color:var(--warning);background:#e67e2233}.badge-locked{color:var(--locked);background:#4a55684d}.badge-gold{color:var(--gold);background:#f1c40f33}.badge-primary{color:var(--primary-light);background:#c0392b33}.ko-text{color:var(--text-korean);font-family:Noto Sans KR,sans-serif;line-height:1.7}.ko-text-lg{font-size:22px;font-weight:700}.ko-text-xl{font-size:26px;font-weight:700}.vi-text{color:var(--text-secondary);background:#fff3e0;border-radius:4px;padding:2px 6px;font-size:14px;font-style:italic;display:inline-block}.progress-container{margin-bottom:24px}.progress-info{justify-content:space-between;align-items:center;margin-bottom:8px;display:flex}.progress-label{color:var(--text-secondary);font-size:13px;font-weight:500}.progress-value{color:var(--primary-light);font-size:13px;font-weight:700}.progress-track{background:var(--bg-elevated);border-radius:4px;height:8px;overflow:hidden}.progress-fill{background:linear-gradient(90deg, var(--primary), var(--accent));border-radius:4px;height:100%;transition:width .6s cubic-bezier(.4,0,.2,1);position:relative;overflow:hidden}.progress-fill:after{content:"";background:linear-gradient(90deg,#0000,#ffffff26,#0000);animation:2s infinite shimmer;position:absolute;inset:0}@keyframes 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#c0392b33}.fc-face.back{background:linear-gradient(150deg,#f0fff4 60%,#e8f5e9);border:2px solid #27ae604d;transform:rotateY(180deg)}.fc-face .flip-hint{color:var(--text-muted);align-items:center;gap:4px;font-size:11px;display:flex;position:absolute;bottom:14px}.fc-controls{flex-wrap:wrap;justify-content:center;gap:12px;margin-bottom:24px;display:flex}.chapter-select-grid{grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:12px;margin-bottom:28px;display:grid}.chapter-chip{background:var(--bg-card);border-radius:var(--radius-md);cursor:pointer;transition:var(--transition);text-align:center;box-shadow:var(--shadow-sm);border:1.5px solid #00000014;padding:14px}.chapter-chip:hover{box-shadow:var(--shadow-md);border-color:#2471a366;transform:translateY(-2px)}.chapter-chip.active{border-color:var(--primary);background:#fff0ee}.chapter-chip.locked{opacity:.55;cursor:not-allowed}.chapter-chip .chip-num{color:var(--primary);font-size:20px;font-weight:900}.chapter-chip 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h1{font-size:26px;font-weight:800}.page-header .page-icon{font-size:32px}.empty-state{text-align:center;color:var(--text-muted);padding:60px 20px}.empty-state .empty-icon{opacity:.5;margin-bottom:16px;font-size:56px;display:block}.empty-state p{font-size:15px}.toggle-row{border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;padding:14px 0;display:flex}.toggle-label{font-size:14px;font-weight:500}.toggle-sub{color:var(--text-muted);margin-top:2px;font-size:12px}.toggle-switch{background:var(--bg-elevated);cursor:pointer;border:none;border-radius:13px;flex-shrink:0;width:46px;height:26px;transition:background .25s;position:relative}.toggle-switch.on{background:linear-gradient(135deg, var(--primary), var(--accent))}.toggle-switch:after{content:"";background:#fff;border-radius:50%;width:20px;height:20px;transition:transform .25s cubic-bezier(.4,0,.2,1);position:absolute;top:3px;left:3px;box-shadow:0 1px 4px 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