:root{--color-primary:#1ba89e;--color-primary-hover:#158f86;--color-primary-rgb:27, 168, 158;--color-secondary:#f5941e;--color-secondary-hover:#e07e10;--color-secondary-rgb:245, 148, 30;--color-bg-default:#f5f1ea;--color-bg-paper:#fff;--color-bg-paper-alt:#faf7f2;--color-text-primary:#1c1c1e;--color-text-primary-rgb:28, 28, 30;--color-text-secondary:#6b6b6b;--color-text-secondary-rgb:107, 107, 107;--color-text-disabled:#b0a898;--color-on-primary:#fff;--color-on-primary-rgb:255, 255, 255;--color-on-secondary:#fff;--color-overlay-black:#000;--color-overlay-black-rgb:0, 0, 0;--color-overlay-white:#fff;--color-overlay-white-rgb:255, 255, 255;--color-youtube:red;--color-youtube-rgb:255, 0, 0;--color-border:#e5e0d8;--color-success:#34c994;--color-success-rgb:52, 201, 148;--color-warning:#f5941e;--color-warning-rgb:245, 148, 30;--color-error:#e05252;--color-error-rgb:224, 82, 82;--primary:var(--color-primary);--primary-hover:var(--color-primary-hover);--secondary:var(--color-secondary);--bg-dark:var(--color-bg-default);--bg-darker:var(--color-bg-paper-alt);--bg-card:var(--color-bg-paper);--text-primary:var(--color-text-primary);--text-secondary:var(--color-text-secondary);--border-color:var(--color-border);--danger:var(--color-error);--success:var(--color-success)}*{box-sizing:border-box;margin:0;padding:0}html,body,#root{background-color:var(--bg-dark);width:100%;height:100%;color:var(--text-primary);font-family:Nunito,Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Open Sans,Helvetica Neue,sans-serif}a{color:inherit;text-decoration:none}button{cursor:pointer;border:none;font-family:inherit}ul{list-style:none}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:var(--bg-darker)}::-webkit-scrollbar-thumb{background:var(--border-color);border-radius:4px}::-webkit-scrollbar-thumb:hover{background:#555}.admin-layout{width:100%;height:100vh;display:flex;overflow:hidden}.sidebar{background-color:var(--bg-darker);border-right:1px solid var(--border-color);flex-direction:column;flex-shrink:0;width:260px;min-width:260px;display:flex;overflow-y:auto}.sidebar-header{border-bottom:1px solid var(--border-color);justify-content:space-between;align-items:center;padding:24px 20px;display:flex}.logo{align-items:center;gap:10px;display:flex}.logo-icon{font-size:24px}.logo h2{color:var(--primary);font-size:20px;font-weight:700}.badge{color:var(--primary);background-color:#ffcc001a;border-radius:6px;padding:4px 8px;font-size:11px;font-weight:600}.sidebar-nav{flex:1;padding:20px 12px;overflow-y:auto}.nav-section{color:var(--text-secondary);text-transform:uppercase;padding:16px 12px 6px;font-size:11px;font-weight:600}.nav-item{color:var(--text-secondary);border-radius:10px;align-items:center;gap:12px;margin-bottom:4px;padding:12px 16px;font-size:14px;font-weight:500;transition:all .2s;display:flex}.nav-item:hover,.nav-item.active{background-color:rgba(var(--color-primary-rgb), .08);color:var(--primary)}.nav-group-toggle{width:100%;font:inherit;text-align:left;background:0 0;border:none;justify-content:flex-start}.nav-group-toggle .chevron{margin-left:auto;transition:transform .2s}.nav-group-toggle .chevron.open{transform:rotate(180deg)}.nav-subgroup{border-left:1px solid var(--border-color);flex-direction:column;margin-left:14px;padding-left:12px;display:flex}.nav-item.sub{padding:10px 14px;font-size:13px}.sidebar-footer{border-top:1px solid var(--border-color);padding:20px}.logout-btn{width:100%;color:var(--text-secondary);background:0 0;border-radius:10px;align-items:center;gap:10px;padding:12px;display:flex}.logout-btn:hover{color:var(--danger);background-color:#ff3b301a}.main-content{flex-direction:column;flex:1;min-width:0;display:flex;overflow:hidden}.topbar{border-bottom:1px solid var(--border-color);background-color:var(--bg-dark);z-index:100;justify-content:space-between;align-items:center;height:70px;padding:0 30px;display:flex;position:sticky;top:0}.sidebar-toggle{color:var(--text-primary);background:0 0;margin-right:15px;display:none}.sidebar-toggle.floating{z-index:200;background:var(--bg-card);border:1px solid var(--border-color);border-radius:8px;padding:6px;display:none;position:fixed;top:12px;left:12px}.user-profile{align-items:center;gap:12px;display:flex}.avatar{background-color:var(--primary);color:#fff;border-radius:50%;justify-content:center;align-items:center;width:36px;height:36px;font-weight:700;display:flex}.content-area{flex:1;padding:0;overflow:hidden auto}@media (width<=992px){.sidebar{z-index:1000;height:100%;transition:transform .3s;position:fixed;transform:translate(-100%)}.sidebar.open{transform:translate(0)}.sidebar-toggle,.sidebar-toggle.floating{display:block}.content-area{padding:15px}.topbar{padding:0 15px}}.page-header{justify-content:space-between;align-items:flex-start;margin-bottom:30px;display:flex}.header-actions{gap:12px;display:flex}.page-header h1{margin-bottom:4px;font-size:28px}.page-header 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4px;font-size:10px;font-weight:700}.icon-success{color:#34c759}.icon-error{color:var(--text-secondary);opacity:.3}.prompt-trigger-small{opacity:0;justify-content:center;align-items:center;width:24px;height:24px;transition:all .2s;display:flex;transform:translateY(2px);color:var(--primary)!important;background:#1ba89e1a!important}tr:hover .prompt-trigger-small{opacity:1;transform:translateY(0)}.prompt-modal{max-width:800px!important}.prompt-label{color:var(--text-secondary);margin-bottom:15px;font-size:14px}.prompt-content-view{border:1px solid var(--border-color);background:#0f172a;border-radius:12px;max-height:500px;padding:20px;position:relative;overflow-y:auto}.prompt-content-view pre{color:#e2e8f0;white-space:pre-wrap;font-family:JetBrains Mono,Fira Code,monospace;font-size:13px;line-height:1.6}.copy-btn-floating{background:var(--primary);color:#fff;border-radius:8px;align-items:center;gap:8px;padding:8px 15px;font-size:12px;font-weight:700;display:flex;position:absolute;top:15px;right:15px;box-shadow:0 4px 12px #00000080}.copy-btn-floating:hover{transform:scale(1.05)}.copy-btn-floating:active{transform:scale(.95)}.modal-overlay.fullscreen{-webkit-backdrop-filter:blur(15px);backdrop-filter:blur(15px);z-index:1500;background:#000000d9;justify-content:center;align-items:center;display:flex;position:fixed;inset:0}.modal-content.fullscreen-content{border:1px solid var(--border-color);background:#fff;border-radius:20px;flex-direction:column;width:95vw;max-width:1400px;height:90vh;padding:0;display:flex;overflow:hidden;box-shadow:0 50px 100px #0f172a40}.modal-content.fullscreen-content .modal-header{background:var(--bg-darker);border-bottom:1px solid var(--border-color);justify-content:space-between;align-items:center;padding:20px 30px;display:flex}.header-title-area h2{color:var(--text-primary);margin:0 0 8px;font-size:24px}.header-meta{gap:10px;display:flex}.header-meta .tag{text-transform:uppercase;letter-spacing:.5px;color:var(--text-secondary);border:1px solid var(--border-color);background:#0f172a0d;border-radius:20px;padding:4px 12px;font-size:11px}.detail-tabs-nav{background:var(--bg-darker);border-bottom:1px solid var(--border-color);gap:5px;padding:0 20px;display:flex}.tab-item{color:var(--text-secondary);cursor:pointer;background:0 0;border:none;border-bottom:3px solid #0000;align-items:center;gap:10px;padding:15px 25px;font-size:14px;font-weight:600;transition:all .3s;display:flex}.tab-item:hover{color:var(--text-primary)}.tab-item.active{color:var(--primary);border-bottom-color:var(--primary);background:#1ba89e0f}.scrollable-body{flex:1;padding:40px;overflow-y:auto}.tab-content-area{animation:.4s fadeInModal}@keyframes fadeInModal{0%{opacity:0;transform:translateY(15px)}to{opacity:1;transform:translateY(0)}}.dialog-line-big{background:var(--bg-darker);border:1px solid var(--border-color);border-radius:12px;gap:20px;max-width:900px;margin-bottom:15px;margin-left:auto;margin-right:auto;padding:20px;display:flex}.role-avatar{background:var(--primary);color:#fff;border-radius:12px;flex-shrink:0;justify-content:center;align-items:center;width:45px;height:45px;font-weight:900;display:flex}.role-B .role-avatar{color:var(--text-primary);background:#ff4757}.line-content .txt{margin:0 0 8px;font-size:17px;line-height:1.6}.line-content .time{color:var(--text-secondary);font-size:12px}.vocab-tab-content{max-width:1000px;margin:0 auto}.word-tag{background:var(--bg-darker);border:1px solid var(--border-color);border-radius:10px;padding:8px 18px;font-size:15px}.quiz-card{background:var(--bg-darker);border:1px solid var(--border-color);border-radius:15px;margin-bottom:20px;padding:25px}.q-badge.true{color:#fff;background:#2ed573;border-radius:8px;padding:5px 15px;font-weight:800}.q-badge.false{color:var(--text-primary);background:#ff4757;border-radius:8px;padding:5px 15px;font-weight:800}.q-footer-info{border-top:1px solid var(--border-color);margin-top:15px;padding-top:10px}.q-answer-label{color:var(--text-secondary);align-items:center;gap:8px;font-size:13px;display:flex}.q-answer-label strong{color:var(--success)}