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p{color:var(--text-secondary);font-size:var(--text-sm);margin-top:var(--sp-2)}.loading-bar{width:200px;height:3px;background:var(--border-subtle);border-radius:var(--radius-full);overflow:hidden;margin:0 auto}.loading-bar-fill{height:100%;width:40%;background:linear-gradient(90deg,var(--amber-500),var(--amber-300));border-radius:var(--radius-full);animation:shimmer 1.5s infinite;background-size:200% 100%}.app-shell{display:flex;min-height:100vh;background:var(--bg-base)}.sidebar{position:fixed;top:0;left:0;bottom:0;width:var(--sidebar-width);background:linear-gradient(180deg,#0f172afa,#0a1628fa);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);border-right:1px solid var(--border-subtle);display:flex;flex-direction:column;z-index:100;transition:transform var(--transition-base);overflow:hidden}.sidebar-header{display:flex;align-items:center;justify-content:space-between;padding:var(--sp-5) var(--sp-5);border-bottom:1px solid 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.main-content{margin-left:0}.sidebar-expand-btn{position:fixed;top:12px;left:12px;z-index:110;width:40px;height:40px;border-radius:var(--radius-md);background:var(--bg-elevated, rgba(28, 34, 48, .95));border:1px solid var(--border-subtle);color:var(--text-secondary);display:none;align-items:center;justify-content:center;cursor:pointer;box-shadow:0 4px 12px #00000059;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);transition:all var(--transition-fast)}.sidebar-expand-btn:hover{color:var(--amber-300, #fbbf24);border-color:var(--amber-500, #f59e0b);transform:translate(2px)}body.sidebar-collapsed .sidebar-expand-btn{display:flex}@media(max-width:768px){.sidebar-toggle{display:none}body.sidebar-collapsed .sidebar{transform:translate(-100%)}body.sidebar-collapsed .main-content{margin-left:0}body.sidebar-collapsed .sidebar-expand-btn{display:none}}.sidebar-progress{display:flex;align-items:center;gap:var(--sp-4);padding:var(--sp-4) var(--sp-5);border-bottom:1px solid var(--border-subtle);flex-shrink:0}.progress-ring-container{position:relative;width:56px;height:56px;flex-shrink:0}.progress-ring{transform:rotate(-90deg)}.progress-ring-bg{fill:none;stroke:var(--border-subtle);stroke-width:4}.progress-ring-fill{fill:none;stroke:var(--emerald-400);stroke-width:4;stroke-linecap:round;stroke-dasharray:150.796;stroke-dashoffset:150.796;transition:stroke-dashoffset .8s ease}.progress-percent{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;align-items:center;justify-content:center;font-size:var(--text-xs);font-weight:700;color:var(--emerald-400)}.progress-info{display:flex;flex-direction:column;gap:2px}.progress-label{font-size:var(--text-xs);font-weight:600;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.05em}.progress-detail{font-size:var(--text-sm);color:var(--text-primary)}.module-nav{flex:1;overflow-y:auto;padding:var(--sp-3) 0}.nav-group{margin-bottom:var(--sp-1)}.nav-group-header{display:flex;align-items:center;gap:var(--sp-3);width:100%;padding:var(--sp-3) var(--sp-5);font-size:var(--text-sm);font-weight:600;color:var(--text-secondary);transition:all var(--transition-fast);text-align:left}.nav-group-header:hover{color:var(--text-primary);background:var(--bg-card)}.nav-group-icon{font-size:1rem}.nav-group-title{flex:1}.nav-chevron{transition:transform var(--transition-fast);flex-shrink:0}.nav-group-header.expanded .nav-chevron{transform:rotate(90deg)}.nav-group-items{max-height:0;overflow:hidden;transition:max-height var(--transition-slow)}.nav-group-items.expanded{max-height:500px}.nav-item{display:flex;align-items:center;gap:var(--sp-3);padding:var(--sp-2) var(--sp-5) var(--sp-2) var(--sp-10);font-size:var(--text-sm);color:var(--text-secondary);transition:all var(--transition-fast);text-decoration:none;border-left:2px solid transparent;position:relative}.nav-item:hover{color:var(--text-primary);background:var(--bg-card);border-left-color:var(--amber-500)}.nav-item.active{color:var(--amber-400);background:var(--accent-glow);border-left-color:var(--amber-500);font-weight:500}.nav-item-num{font-size:var(--text-xs);font-weight:700;color:var(--text-muted);min-width:20px;font-variant-numeric:tabular-nums}.nav-item.active .nav-item-num{color:var(--amber-500)}.nav-item-title{flex:1}.nav-item-status{width:8px;height:8px;border-radius:50%;background:var(--border-subtle);flex-shrink:0}.nav-item-status.completed{background:var(--emerald-400);box-shadow:0 0 6px #10b98166}.nav-item-status.in-progress{background:var(--amber-400);box-shadow:0 0 6px #f59e0b66}.sidebar-footer{display:none;align-items:center;justify-content:center;gap:var(--sp-2);padding:var(--sp-4) var(--sp-5);border-top:1px solid var(--border-subtle);flex-shrink:0}.btn-icon{display:inline-flex;align-items:center;justify-content:center;width:40px;height:40px;border-radius:var(--radius-md);color:var(--text-secondary);transition:all var(--transition-fast)}.btn-icon:hover{color:var(--text-primary);background:var(--bg-elevated)}.lang-indicator{font-size:var(--text-xs);font-weight:700;letter-spacing:.03em}.main-content{flex:1;margin-left:var(--sidebar-width);min-height:100vh;display:flex;flex-direction:column;transition:margin-left var(--transition-base)}.topbar{position:sticky;top:0;z-index:50;display:flex;align-items:center;gap:var(--sp-4);padding:0 var(--sp-8);height:var(--topbar-height);background:#0f172acc;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid var(--border-subtle)}.topbar-actions{display:flex;align-items:center;gap:var(--sp-3);margin-left:auto;flex-shrink:0}.mobile-menu-toggle{display:none;padding:var(--sp-2);color:var(--text-secondary)}.breadcrumb{flex:1;font-size:var(--text-sm);color:var(--text-secondary);display:flex;align-items:center;gap:var(--sp-2)}.breadcrumb .separator{color:var(--text-muted)}.breadcrumb .current{color:var(--text-primary);font-weight:500}.lang-switch{display:flex;background:var(--bg-surface);border-radius:var(--radius-full);padding:3px;border:1px solid var(--border-subtle)}.lang-btn{padding:var(--sp-1) var(--sp-3);font-size:var(--text-xs);font-weight:600;border-radius:var(--radius-full);color:var(--text-muted);transition:all var(--transition-fast)}.lang-btn:hover{color:var(--text-primary)}.lang-btn.active{background:var(--amber-500);color:var(--slate-900);box-shadow:0 1px 4px #f59e0b4d}.btn-search{display:flex;align-items:center;gap:var(--sp-2);padding:var(--sp-2) var(--sp-4);background:var(--bg-surface);border:1px solid var(--border-subtle);border-radius:var(--radius-full);color:var(--text-muted);font-size:var(--text-sm);transition:all var(--transition-fast);cursor:pointer}.btn-search:hover{color:var(--text-primary);border-color:var(--amber-500);background:#f59e0b14}.btn-search svg{flex-shrink:0}.btn-search-label{font-family:var(--font-sans);color:var(--text-muted)}.btn-search-kbd{font-family:var(--font-sans);font-size:10px;background:var(--bg-elevated);color:var(--text-muted);padding:1px 6px;border-radius:3px;border:1px solid var(--border-default);margin-left:var(--sp-2)}.content-area{flex:1;padding:var(--sp-8);max-width:1200px;width:100%;margin:0 auto}.sidebar-overlay{display:none;position:fixed;top:0;right:0;bottom:0;left:0;background:#0009;z-index:99}@media(max-width:1024px){.sidebar{transform:translate(-100%)}.sidebar.open{transform:translate(0)}.main-content{margin-left:0}.mobile-menu-toggle{display:flex}.sidebar-overlay.active{display:block}}@media(max-width:640px){.content-area{padding:var(--sp-4)}.topbar{padding:0 var(--sp-4)}.lang-switch{display:none}.sidebar-footer{display:flex}.btn-search-label,.btn-search-kbd{display:none}.btn-search{padding:var(--sp-2);border-radius:var(--radius-md)}.topbar-actions{flex-shrink:1;min-width:0;flex-wrap:wrap}#user-badge>.user-badge-name{display:none}#user-badge .badge-guest .badge-guest-label,.breadcrumb{display:none}.module-hero h1{font-size:1.4rem;word-break:break-word;overflow-wrap:anywhere;max-width:100%}html,body{overflow-x:hidden;max-width:100vw}}.card{background:var(--bg-card);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border:1px solid var(--border-subtle);border-radius:var(--radius-lg);padding:var(--sp-6);transition:all var(--transition-base)}.card:hover{border-color:var(--border-default);box-shadow:var(--shadow-md)}.card-accent{border-left:3px solid var(--amber-500)}.card-success{border-left:3px solid var(--emerald-500)}.card-header{display:flex;align-items:center;gap:var(--sp-3);margin-bottom:var(--sp-4)}.card-icon{width:40px;height:40px;border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;font-size:1.2rem;background:var(--accent-glow);flex-shrink:0}.card-title{font-size:var(--text-lg);font-weight:700}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--sp-2);padding:var(--sp-3) var(--sp-6);font-size:var(--text-sm);font-weight:600;border-radius:var(--radius-md);transition:all var(--transition-fast);white-space:nowrap;cursor:pointer;border:none}.btn-primary{background:linear-gradient(135deg,var(--amber-500),var(--amber-600));color:var(--slate-900);box-shadow:0 2px 8px #f59e0b4d}.btn-primary:hover{background:linear-gradient(135deg,var(--amber-400),var(--amber-500));transform:translateY(-1px)}.btn-secondary{background:var(--bg-elevated);color:var(--text-primary);border:1px solid var(--border-default)}.btn-secondary:hover{background:var(--bg-card-hover)}.btn-ghost{background:transparent;color:var(--text-secondary)}.btn-ghost:hover{background:var(--bg-card);color:var(--text-primary)}.btn-success{background:linear-gradient(135deg,var(--emerald-500),var(--emerald-600));color:#fff}.btn-sm{padding:var(--sp-2) var(--sp-4);font-size:var(--text-xs)}.btn-lg{padding:var(--sp-4) var(--sp-8);font-size:var(--text-md)}.badge{display:inline-flex;align-items:center;gap:var(--sp-1);padding:2px var(--sp-3);font-size:var(--text-xs);font-weight:600;border-radius:var(--radius-full);background:var(--bg-elevated);color:var(--text-secondary)}.badge-amber{background:#f59e0b26;color:var(--amber-400)}.badge-emerald{background:#10b98126;color:var(--emerald-400)}.tabs{display:flex;gap:var(--sp-1);border-bottom:1px solid var(--border-subtle);margin-bottom:var(--sp-6)}.tab{padding:var(--sp-3) var(--sp-4);font-size:var(--text-sm);font-weight:500;color:var(--text-muted);border-bottom:2px solid transparent;transition:all var(--transition-fast);cursor:pointer;background:none;border-top:none;border-left:none;border-right:none}.tab:hover{color:var(--text-primary)}.tab.active{color:var(--amber-400);border-bottom-color:var(--amber-500)}.accordion{border:1px solid var(--border-subtle);border-radius:var(--radius-md);overflow:hidden}.accordion-item{border-bottom:1px solid var(--border-subtle)}.accordion-item:last-child{border-bottom:none}.accordion-trigger{display:flex;align-items:center;gap:var(--sp-3);width:100%;padding:var(--sp-4) var(--sp-5);font-size:var(--text-base);font-weight:600;color:var(--text-primary);background:var(--bg-card);text-align:left;transition:all var(--transition-fast)}.accordion-trigger:hover{background:var(--bg-card-hover)}.accordion-trigger .chevron{margin-left:auto;transition:transform var(--transition-fast)}.accordion-trigger.open .chevron{transform:rotate(180deg)}.accordion-body{max-height:0;overflow:hidden;transition:max-height var(--transition-slow)}.accordion-body.open{max-height:2000px}.accordion-content{padding:var(--sp-4) var(--sp-5)}.exercise-container{background:var(--bg-card);border:1px solid var(--border-subtle);border-radius:var(--radius-lg);overflow:hidden;margin:var(--sp-6) 0}.exercise-header{display:flex;align-items:center;gap:var(--sp-3);padding:var(--sp-4) var(--sp-6);background:linear-gradient(135deg,#f59e0b14,#f59e0b05);border-bottom:1px solid var(--border-subtle)}.exercise-type-icon{width:36px;height:36px;border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;font-size:1.1rem;background:var(--accent-glow)}.exercise-title{font-size:var(--text-md);font-weight:700;flex:1}.exercise-score{display:flex;align-items:center;gap:var(--sp-2);font-size:var(--text-sm);font-weight:600;color:var(--emerald-400)}.exercise-body{padding:var(--sp-6)}.exercise-footer{display:flex;align-items:center;justify-content:space-between;padding:var(--sp-4) var(--sp-6);border-top:1px solid var(--border-subtle);background:#0f172a66}.exercise-container[data-submitted="1"] .exercise-body{pointer-events:none;opacity:.85}.exercise-container[data-submitted="1"] .exercise-footer button:disabled{opacity:.55;cursor:not-allowed}.quiz-option{display:flex;align-items:center;gap:var(--sp-3);padding:var(--sp-3) var(--sp-4);margin-bottom:var(--sp-2);border:1px solid var(--border-subtle);border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-fast)}.quiz-option:hover{border-color:var(--amber-500);background:var(--accent-glow)}.quiz-option.selected{border-color:var(--amber-500);background:#f59e0b1a}.quiz-option.correct{border-color:var(--emerald-500);background:#10b9811a}.quiz-option.incorrect{border-color:var(--rose-500);background:#f43f5e1a}.quiz-radio{width:18px;height:18px;border:2px solid var(--text-muted);border-radius:50%;flex-shrink:0;display:flex;align-items:center;justify-content:center;transition:all var(--transition-fast)}.quiz-option.selected .quiz-radio{border-color:var(--amber-500)}.quiz-option.selected .quiz-radio:after{content:"";width:8px;height:8px;border-radius:50%;background:var(--amber-500)}.quiz-option.correct .quiz-radio{border-color:var(--emerald-500);background:var(--emerald-500)}.quiz-label{font-size:var(--text-sm);color:var(--text-primary);line-height:1.5}.quiz-multi .quiz-radio{border-radius:4px}.quiz-multi .quiz-option.selected .quiz-radio:after{border-radius:1px;width:10px;height:10px}.quiz-q-timer{margin:0 0 var(--sp-3);padding:6px 10px;background:#f59e0b0f;border:1px solid rgba(245,158,11,.18);border-radius:var(--radius-sm);display:flex;align-items:center;gap:var(--sp-3)}.quiz-q-timer-bar{flex:1;position:relative;height:4px;border-radius:2px;background:#ffffff0f;overflow:hidden}.quiz-q-timer-fill{display:block;height:100%;width:100%;background:linear-gradient(90deg,var(--amber-400, #fbbf24),var(--amber-500, #f59e0b));transition:width .25s linear}.quiz-q-timer-text{display:inline-flex;align-items:center;gap:4px;font-size:.75rem;font-weight:700;color:var(--amber-300, 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var(--transition-base)}.modal-overlay.active{opacity:1;visibility:visible}.modal{background:var(--bg-surface);border:1px solid var(--border-default);border-radius:var(--radius-xl);width:90%;max-width:560px;max-height:85vh;overflow-y:auto;animation:scaleIn .3s ease}.modal-header{display:flex;align-items:center;justify-content:space-between;padding:var(--sp-5) var(--sp-6);border-bottom:1px solid var(--border-subtle)}.modal-title{font-size:var(--text-lg);font-weight:700}.modal-body{padding:var(--sp-6)}.modal-footer{display:flex;justify-content:flex-end;gap:var(--sp-3);padding:var(--sp-4) var(--sp-6);border-top:1px solid var(--border-subtle)}.toast-container{position:fixed;top:var(--sp-4);right:var(--sp-4);z-index:300;display:flex;flex-direction:column;gap:var(--sp-3)}.toast{display:flex;align-items:center;gap:var(--sp-3);padding:var(--sp-3) var(--sp-5);background:var(--bg-surface);border:1px solid 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[class*=lang-]:not(.lang-ja):not(.lang-bil-sep):not(.lang-indicator):not(.lang-btn){display:none}body[data-lang=ko] [class*=lang-]:not(.lang-ko):not(.lang-bil-sep):not(.lang-indicator):not(.lang-btn){display:none}body[data-lang=es] [class*=lang-]:not(.lang-es):not(.lang-bil-sep):not(.lang-indicator):not(.lang-btn){display:none}body[data-lang=fr] [class*=lang-]:not(.lang-fr):not(.lang-bil-sep):not(.lang-indicator):not(.lang-btn){display:none}body[data-lang=de] [class*=lang-]:not(.lang-de):not(.lang-bil-sep):not(.lang-indicator):not(.lang-btn){display:none}body[data-lang=ru] [class*=lang-]:not(.lang-ru):not(.lang-bil-sep):not(.lang-indicator):not(.lang-btn){display:none}body[data-lang=ar] [class*=lang-]:not(.lang-ar):not(.lang-bil-sep):not(.lang-indicator):not(.lang-btn){display:none}body[data-lang=zh] .bilingual,body[data-lang=ja] .bilingual,body[data-lang=ko] .bilingual,body[data-lang=es] .bilingual,body[data-lang=fr] .bilingual,body[data-lang=de] .bilingual,body[data-lang=ru] .bilingual,body[data-lang=ar] .bilingual{grid-template-columns:1fr}body[data-lang=zh] .lang-bil-sep,body[data-lang=ja] .lang-bil-sep,body[data-lang=ko] .lang-bil-sep,body[data-lang=es] .lang-bil-sep,body[data-lang=fr] .lang-bil-sep,body[data-lang=de] .lang-bil-sep,body[data-lang=ru] .lang-bil-sep,body[data-lang=ar] .lang-bil-sep{display:none}.lang-bil-sep{display:inline}body[data-lang=en] .lang-bil-sep,body[data-lang=vn] .lang-bil-sep{display:none}body[data-lang=both] .lang-vn,body[data-lang=both] .lang-vn .text-muted,body[data-lang=both] .lang-vn .lang-bil-sep{color:var(--amber-300)}.fill-blank{display:inline-block;border:none;border-bottom:1px dashed currentColor;background:transparent;color:var(--amber-400, #fbbf24);font:inherit;padding:0 .25em;outline:none;vertical-align:baseline;min-width:5ch;max-width:100%;margin:0 .1em}.fill-blank::placeholder{color:var(--text-muted, #94a3b8);opacity:.5}.fill-blank:focus{border-bottom-color:var(--amber-400, 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var(--sp-4);border:1px solid var(--border-default)}.content-table td{padding:var(--sp-3) var(--sp-4);border:1px solid var(--border-subtle);color:var(--text-primary)}.content-table tr:hover td{background:var(--bg-card)}.diagram-container{background:linear-gradient(135deg,var(--bg-card),rgba(30,58,95,.3));border:1px solid var(--border-subtle);border-radius:var(--radius-lg);margin:var(--sp-6) 0;overflow:hidden;transition:all .3s ease}.diagram-container:hover{border-color:var(--amber-500);box-shadow:0 0 20px #f59e0b1a}.diagram-header{display:flex;align-items:center;gap:var(--sp-2);padding:var(--sp-3) var(--sp-5);background:#f59e0b14;border-bottom:1px solid var(--border-subtle)}.diagram-icon{font-size:1.2em}.diagram-label{font-size:var(--text-sm);font-weight:600;color:var(--amber-400);flex:1}.diagram-zoom-btn{background:none;border:1px solid var(--border-subtle);border-radius:var(--radius-sm);color:var(--text-secondary);padding:4px 8px;cursor:pointer;transition:all 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