@import"https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500&display=swap";:root{--primary: #7c3aed;--primary-dark: #6d28d9;--primary-light: #a78bfa;--primary-subtle: rgba(124, 58, 237, .1);--secondary: #06b6d4;--accent: #f472b6;--bg-base: #0f0f14;--bg-elevated: #18181f;--bg-surface: #1f1f28;--bg-hover: #2a2a36;--text-primary: #f4f4f5;--text-secondary: #a1a1aa;--text-muted: #71717a;--border: rgba(255, 255, 255, .08);--border-hover: rgba(255, 255, 255, .15);--success: #22c55e;--warning: #eab308;--error: #ef4444;--info: #3b82f6;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .4);--shadow-md: 0 4px 12px rgba(0, 0, 0, .5);--shadow-lg: 0 8px 24px rgba(0, 0, 0, .6);--shadow-glow: 0 0 24px rgba(124, 58, 237, .25);--radius-sm: 6px;--radius-md: 10px;--radius-lg: 16px;--radius-xl: 24px;--transition-fast: .15s ease;--transition-base: .25s ease;--font-main: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;--font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace}*,*:before,*:after{margin:0;padding:0;box-sizing:border-box}html{font-size:16px;scroll-behavior:smooth}body{font-family:var(--font-main);background:var(--bg-base);color:var(--text-primary);line-height:1.6;min-height:100vh;-webkit-font-smoothing:antialiased}#root{min-height:100vh;display:flex;flex-direction:column}a{color:var(--primary-light);text-decoration:none;transition:color var(--transition-fast)}a:hover{color:var(--primary)}h1,h2,h3,h4,h5,h6{font-weight:700;line-height:1.3;color:var(--text-primary)}h1{font-size:2rem;letter-spacing:-.02em}h2{font-size:1.5rem}h3{font-size:1.25rem}h4{font-size:1.1rem}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:10px 20px;border:none;border-radius:var(--radius-md);font-size:.9rem;font-weight:600;cursor:pointer;transition:all var(--transition-base);text-decoration:none;white-space:nowrap}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-dark);transform:translateY(-1px);box-shadow:var(--shadow-glow)}.btn-secondary{background:var(--bg-surface);color:var(--text-primary);border:1px solid var(--border)}.btn-secondary:hover{background:var(--bg-hover);border-color:var(--border-hover)}.btn-success{background:var(--success);color:#fff}.btn-success:hover{filter:brightness(1.1)}.btn-danger{background:var(--error);color:#fff}.btn-danger:hover{filter:brightness(1.1)}.btn-sm{padding:6px 12px;font-size:.8rem}.btn-lg{padding:14px 28px;font-size:1rem}.btn:disabled{opacity:.5;cursor:not-allowed;transform:none!important}.form-group{margin-bottom:16px}.form-label{display:block;margin-bottom:6px;font-weight:500;font-size:.9rem;color:var(--text-secondary)}.form-input{width:100%;padding:10px 14px;background:var(--bg-surface);border:1px solid var(--border);border-radius:var(--radius-md);color:var(--text-primary);font-size:.95rem;transition:all var(--transition-base)}.form-input:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-subtle)}.form-input::placeholder{color:var(--text-muted)}select.form-input{padding-right:36px;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23888' d='M6 8L1 3h10z'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 12px center;cursor:pointer}.card{background:var(--bg-elevated);border-radius:var(--radius-lg);padding:24px;border:1px solid var(--border);transition:all var(--transition-base)}.card:hover{border-color:var(--border-hover)}.flashcard-container{perspective:1000px;width:100%;max-width:560px;height:320px;margin:0 auto}.flashcard{width:100%;height:100%;position:relative;transform-style:preserve-3d;transition:transform .5s cubic-bezier(.4,0,.2,1);cursor:pointer;transform-origin:center center}.flashcard.flipped{transform:rotateY(180deg)}.flashcard-face{position:absolute;left:0;top:0;width:100%;height:100%;backface-visibility:hidden;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:40px;border-radius:var(--radius-xl);text-align:center}.flashcard-front{background:linear-gradient(135deg,var(--primary) 0%,var(--primary-dark) 100%);color:#fff;box-shadow:var(--shadow-lg)}.flashcard-back{background:var(--bg-elevated);border:2px solid var(--primary);color:var(--text-primary);transform:rotateY(180deg)}.flashcard-label{font-size:.75rem;text-transform:uppercase;letter-spacing:.1em;opacity:.7;margin-bottom:16px}.flashcard-content{font-size:1.5rem;font-weight:600;line-height:1.4;text-align:center;width:100%}.flashcard-actions{position:absolute;bottom:16px;right:16px;display:flex;gap:8px}.flashcard-action-btn{width:40px;height:40px;border-radius:var(--radius-md);border:none;background:#ffffff26;color:inherit;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all var(--transition-fast);-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}.flashcard-action-btn:hover{background:#ffffff40;transform:scale(1.05)}.flashcard-action-btn.active{background:#ffffff59;animation:pulse 1s infinite}@keyframes pulse{0%,to{opacity:1}50%{opacity:.6}}.flashcard-back .flashcard-action-btn{background:var(--primary-subtle);color:var(--primary)}.flashcard-back .flashcard-action-btn:hover{background:#7c3aed40}.navbar{display:flex;align-items:center;justify-content:space-between;padding:16px 32px;background:#0f0f14f2;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:100}.navbar-brand{font-size:1.25rem;font-weight:800;color:var(--text-primary);letter-spacing:-.02em}.navbar-brand span{color:var(--primary)}.navbar-nav{display:flex;align-items:center;gap:24px;list-style:none}.navbar-nav a{color:var(--text-secondary);font-weight:500;font-size:1rem;transition:color var(--transition-fast)}.navbar-nav a:hover{color:var(--text-primary)}.navbar-user{color:var(--text-muted);font-size:.875rem}.container{max-width:1100px;margin:0 auto;padding:0 24px}.page{padding:40px 0;flex:1}.page-header{margin-bottom:32px}.page-title{font-size:1.75rem;font-weight:700}.grid{display:grid;gap:20px}.grid-2{grid-template-columns:repeat(2,1fr)}.grid-3{grid-template-columns:repeat(3,1fr)}.grid-4{grid-template-columns:repeat(4,1fr)}@media(max-width:900px){.grid-3,.grid-4{grid-template-columns:repeat(2,1fr)}}.navbar-toggler{display:none;background:none;border:none;color:var(--text-primary);font-size:1.5rem;cursor:pointer;padding:4px}.mobile-only,.mobile-only-user-info{display:none}.desktop-only{display:block}@media(max-width:768px){.grid-2,.grid-3,.grid-4{grid-template-columns:1fr}.navbar{padding:12px 16px;justify-content:space-between}.navbar-toggler{display:block}.navbar-nav{display:none!important}.navbar-nav a{display:block;width:100%;padding:6px 0;font-size:1rem}.desktop-only{display:none!important}.mobile-only{display:block;width:100%}.mobile-only button{width:100%;text-align:left;padding:8px 0}.mobile-only-user-info{display:flex;align-items:center;gap:12px;padding-bottom:16px;margin-bottom:8px;border-bottom:1px solid var(--border);width:100%;font-weight:600;color:var(--text-primary)}.nav-avatar-placeholder{width:32px;height:32px;border-radius:50%;background:var(--primary-subtle);color:var(--primary);display:flex;align-items:center;justify-content:center;font-weight:700}}@keyframes slideDown{0%{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}.auth-page{min-height:100vh;display:grid;place-items:center;padding:24px 16px;background:radial-gradient(900px 500px at 15% 5%,rgba(124,58,237,.25),transparent 60%),radial-gradient(900px 500px at 85% 20%,rgba(6,182,212,.18),transparent 65%),var(--bg-base)}.auth-page--split{padding:0}.auth-split{width:100%;min-height:100vh;display:grid;grid-template-columns:1.1fr .9fr}.auth-showcase{display:flex;align-items:center;justify-content:center;padding:56px;border-right:1px solid rgba(255,255,255,.06);background:radial-gradient(900px 500px at 20% 10%,rgba(124,58,237,.22),transparent 60%),radial-gradient(900px 500px at 80% 20%,rgba(244,114,182,.14),transparent 65%),#0f0f1459}.auth-showcase__inner{width:100%;max-width:520px}.auth-showcase__title{margin-top:22px;font-size:3rem;line-height:1.05;letter-spacing:-.03em}.auth-showcase__grad{background:linear-gradient(135deg,var(--primary) 0%,var(--accent) 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.auth-showcase__desc{margin-top:14px;max-width:44ch;color:var(--text-secondary);font-size:1.05rem}.auth-showcase__list{list-style:none;display:grid;gap:10px;margin:22px 0 0;padding:0;color:var(--text-primary)}.auth-bullet{width:10px;height:10px;border-radius:999px;background:linear-gradient(135deg,var(--primary) 0%,var(--secondary) 100%);box-shadow:0 0 0 4px #7c3aed24;display:inline-block;margin-right:10px}.auth-showcase__stats{margin-top:26px;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.auth-stat{border:1px solid rgba(255,255,255,.08);background:#18181f80;border-radius:14px;padding:14px 14px 12px}.auth-stat__value{font-weight:800;letter-spacing:-.02em}.auth-stat__label{margin-top:4px;color:var(--text-muted);font-size:.85rem}.auth-panel{display:flex;flex-direction:column;justify-content:center;align-items:center;padding:56px;background:#18181fbf;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.auth-panel>*{width:100%;max-width:420px}.auth-brand{display:flex;align-items:center;gap:12px}.auth-mark{width:44px;height:44px;border-radius:14px;display:grid;place-items:center;font-weight:800;color:#fff;background:linear-gradient(135deg,var(--primary) 0%,var(--accent) 100%);box-shadow:0 10px 24px #7c3aed40}.auth-brand-title{font-weight:800;letter-spacing:-.02em;line-height:1.1}.auth-brand-subtitle{font-size:.85rem;color:var(--text-muted)}.auth-title{text-align:left;font-size:1.6rem;margin-bottom:6px}.auth-subtitle{text-align:left;color:var(--text-secondary);margin-bottom:18px;font-size:.95rem}.auth-form{display:flex;flex-direction:column;gap:10px;margin-top:10px;max-width:420px}.auth-submit{width:100%;margin-top:4px}.auth-divider{height:1px;background:var(--border);margin:18px 0 14px}.auth-footer{text-align:center;margin-top:0;color:var(--text-secondary);font-size:.9rem}@media(max-width:900px){.auth-split{grid-template-columns:1fr}.auth-showcase{display:none}.auth-panel{padding:28px 20px}}.set-card{background:var(--bg-elevated);border-radius:var(--radius-lg);padding:20px;border:1px solid var(--border);transition:all var(--transition-base);display:flex;flex-direction:column;height:100%}.set-card:hover{border-color:var(--primary);transform:translateY(-2px);box-shadow:var(--shadow-md)}.set-card-title{font-size:1.1rem;margin-bottom:6px;font-weight:600}.set-card-desc{color:var(--text-muted);font-size:.85rem;margin-bottom:12px;display:-webkit-box;-webkit-line-clamp:2;line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;min-height:2.4em}.set-card-meta{color:var(--text-muted);font-size:.8rem;display:flex;align-items:center;gap:16px;margin-bottom:16px;margin-top:auto}.set-card-actions{display:flex;gap:8px;flex-wrap:wrap}.study-controls{display:flex;justify-content:center;gap:10px;margin-top:28px;flex-wrap:wrap}.study-btn{padding:14px 24px;border-radius:var(--radius-md);font-size:.9rem;font-weight:600;border:none;cursor:pointer;transition:all var(--transition-base);min-width:100px}.study-btn.again{background:var(--error);color:#fff}.study-btn.hard{background:var(--warning);color:#1a1a1a}.study-btn.good{background:var(--info);color:#fff}.study-btn.easy{background:var(--success);color:#fff}.study-btn:hover{transform:scale(1.03);filter:brightness(1.1)}.progress-bar{width:100%;height:6px;background:var(--bg-surface);border-radius:3px;overflow:hidden}.progress-fill{height:100%;background:var(--primary);border-radius:3px;transition:width var(--transition-base)}.quiz-option{display:block;width:100%;padding:16px 20px;background:var(--bg-surface);border:1px solid var(--border);border-radius:var(--radius-md);color:var(--text-primary);font-size:.95rem;text-align:left;cursor:pointer;transition:all var(--transition-base);margin-bottom:10px}.quiz-option:hover{border-color:var(--primary);background:var(--bg-hover)}.quiz-option.correct{border-color:var(--success);background:#22c55e1a}.quiz-option.incorrect{border-color:var(--error);background:#ef44441a}.quiz-option.selected{border-color:var(--primary);background:var(--primary-subtle)}.empty-state{text-align:center;padding:60px 20px;color:var(--text-secondary)}.empty-state-icon{width:64px;height:64px;margin:0 auto 20px;background:var(--bg-surface);border-radius:var(--radius-lg);display:flex;align-items:center;justify-content:center}.empty-state-icon svg{width:32px;height:32px;stroke:var(--text-muted)}.empty-state-title{font-size:1.25rem;margin-bottom:8px;color:var(--text-primary)}.alert{padding:14px 18px;border-radius:var(--radius-md);margin-bottom:20px;font-size:.9rem}.alert-error{background:#ef44441a;border:1px solid var(--error);color:var(--error)}.alert-success{background:#22c55e1a;border:1px solid var(--success);color:var(--success)}@keyframes fadeIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.fade-in{animation:fadeIn .25s ease-out}.loading{display:flex;align-items:center;justify-content:center;padding:60px;min-height:300px}.spinner{width:36px;height:36px;border:3px solid var(--bg-surface);border-top-color:var(--primary);border-radius:50%;animation:spin .7s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.text-center{text-align:center}.text-muted{color:var(--text-muted)}.text-secondary{color:var(--text-secondary)}.mt-1{margin-top:8px}.mt-2{margin-top:16px}.mt-3{margin-top:24px}.mb-1{margin-bottom:8px}.mb-2{margin-bottom:16px}.mb-3{margin-bottom:24px}.no-scrollbar::-webkit-scrollbar{display:none!important}.no-scrollbar{-ms-overflow-style:none!important;scrollbar-width:none!important}.flex-center{display:flex;align-items:center;justify-content:center}.gap-1{gap:8px}.gap-2{gap:16px}.hero{text-align:center;padding:80px 20px;max-width:700px;margin:0 auto}.hero-title{font-size:2.75rem;font-weight:800;letter-spacing:-.03em;margin-bottom:16px;line-height:1.1}.hero-title span{background:linear-gradient(135deg,var(--primary) 0%,var(--accent) 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.hero-desc{font-size:1.1rem;color:var(--text-secondary);margin-bottom:32px;line-height:1.7}.hero-actions{display:flex;justify-content:center;gap:12px;flex-wrap:wrap}.feature-card{background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius-lg);padding:28px 24px;text-align:center;transition:all var(--transition-base)}.feature-card:hover{border-color:var(--border-hover);transform:translateY(-2px)}.feature-icon{width:48px;height:48px;margin:0 auto 16px;background:var(--primary-subtle);border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center}.feature-icon svg{width:24px;height:24px;stroke:var(--primary)}.feature-title{font-size:1rem;margin-bottom:8px;font-weight:600}.feature-desc{font-size:.875rem;color:var(--text-muted);line-height:1.5}.ai-chat-overlay{position:fixed;inset:0;background:#000000d9;display:flex;align-items:center;justify-content:center;z-index:1000;padding:20px}.ai-chat-container{width:100%;max-width:500px;max-height:85vh;background:var(--bg-elevated);border-radius:var(--radius-xl);border:1px solid var(--border);display:flex;flex-direction:column;overflow:hidden}.ai-chat-header{display:flex;align-items:center;justify-content:space-between;padding:16px 20px;border-bottom:1px solid var(--border)}.ai-chat-title{display:flex;align-items:center;gap:10px;font-weight:600;color:var(--primary)}.ai-chat-close{background:none;border:none;color:var(--text-muted);font-size:1.5rem;cursor:pointer;padding:4px;line-height:1}.ai-chat-close:hover{color:var(--text-primary)}.ai-chat-card-info{padding:12px 20px;background:var(--bg-surface);display:flex;align-items:center;gap:10px;font-size:.85rem;flex-wrap:wrap}.ai-chat-term{color:var(--primary);font-weight:600}.ai-chat-sep{color:var(--text-muted)}.ai-chat-def{color:var(--text-secondary)}.ai-chat-messages{flex:1;overflow-y:auto;padding:16px;display:flex;flex-direction:column;gap:12px}.ai-chat-msg{max-width:90%;padding:12px 16px;border-radius:var(--radius-lg);font-size:.9rem;line-height:1.6}.ai-chat-msg.user{align-self:flex-end;background:var(--primary);color:#fff;border-bottom-right-radius:4px}.ai-chat-msg.assistant{align-self:flex-start;background:var(--bg-surface);color:var(--text-primary);border-bottom-left-radius:4px}.ai-chat-msg.assistant h1,.ai-chat-msg.assistant h2,.ai-chat-msg.assistant h3{font-size:1rem;margin:8px 0 4px}.ai-chat-msg.assistant p{margin:8px 0}.ai-chat-msg.assistant ul,.ai-chat-msg.assistant ol{margin:8px 0;padding-left:20px}.ai-chat-msg.assistant li{margin:4px 0}.ai-chat-msg.assistant strong{color:var(--primary-light)}.ai-chat-msg.assistant code{background:var(--bg-hover);padding:2px 6px;border-radius:4px;font-size:.85em}.ai-typing{display:flex;gap:4px;padding:8px 0}.ai-typing span{width:8px;height:8px;background:var(--text-muted);border-radius:50%;animation:typing 1.4s infinite}.ai-typing span:nth-child(2){animation-delay:.2s}.ai-typing span:nth-child(3){animation-delay:.4s}@keyframes typing{0%,60%,to{opacity:.3;transform:translateY(0)}30%{opacity:1;transform:translateY(-4px)}}.ai-quick-questions{display:flex;gap:8px;padding:12px 16px;overflow-x:auto;border-top:1px solid var(--border)}.ai-quick-btn{padding:6px 12px;background:var(--bg-surface);border:1px solid var(--border);border-radius:var(--radius-md);color:var(--text-secondary);font-size:.8rem;white-space:nowrap;cursor:pointer;transition:all var(--transition-fast)}.ai-quick-btn:hover{border-color:var(--primary);color:var(--primary)}.ai-chat-input-form{display:flex;gap:10px;padding:16px;border-top:1px solid var(--border)}.ai-chat-input{flex:1;padding:12px 16px;background:var(--bg-surface);border:1px solid var(--border);border-radius:var(--radius-md);color:var(--text-primary);font-size:.9rem}.ai-chat-input:focus{outline:none;border-color:var(--primary)}.ai-chat-input::placeholder{color:var(--text-muted)}.ai-chat-send{width:44px;height:44px;background:var(--primary);border:none;border-radius:var(--radius-md);color:#fff;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all var(--transition-fast)}.ai-chat-send:hover:not(:disabled){background:var(--primary-dark)}.ai-chat-send:disabled{opacity:.5;cursor:not-allowed}.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-bottom:32px}@media(max-width:700px){.stats-grid{grid-template-columns:repeat(2,1fr)}}.stat-card{background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius-lg);padding:24px 16px;text-align:center;transition:all var(--transition-base)}.stat-card:hover{border-color:var(--primary);transform:translateY(-2px)}.stat-icon{font-size:2rem;margin-bottom:8px}.stat-value{font-size:2rem;font-weight:700;color:var(--text-primary);line-height:1}.stat-label{font-size:.8rem;color:var(--text-muted);margin-top:6px}.profile-section{margin-bottom:32px}.section-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px}.section-header h2{font-size:1.25rem}.badge{background:var(--primary-subtle);color:var(--primary);padding:4px 12px;border-radius:20px;font-size:.8rem;font-weight:600}.achievements-grid{display:grid;gap:12px}.achievement-card{display:flex;align-items:center;gap:16px;background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius-md);padding:16px;transition:all var(--transition-base)}.achievement-card.unlocked{border-color:var(--success);background:#22c55e0d}.achievement-card.locked{opacity:.6}.achievement-icon{font-size:2rem;width:48px;text-align:center}.achievement-info{flex:1}.achievement-name{font-weight:600;color:var(--text-primary)}.achievement-desc{font-size:.85rem;color:var(--text-muted);margin-top:2px}.achievement-check{color:var(--success);font-size:1.25rem;font-weight:700}.achievement-xp{color:var(--primary);font-size:.85rem;font-weight:600}.achievement-card.exclusive{position:relative;background:transparent;padding:18px;overflow:hidden;z-index:0;border:none;box-shadow:0 0 25px #0f172a80}.achievement-card.exclusive:before{content:"";position:absolute;top:50%;left:50%;width:250%;height:250%;transform:translate(-50%,-50%);background:conic-gradient(transparent 0deg,transparent 280deg,#38bdf8 300deg,#94a3b8 340deg,#ffffff 360deg);animation:rotate-lightning 4s linear infinite;z-index:-2}.achievement-card.exclusive:after{content:"";position:absolute;inset:2px;background:linear-gradient(135deg,#1e293b,#0f172a);border-radius:calc(var(--radius-md) - 1px);z-index:-1;box-shadow:inset 0 0 40px #00000080}@keyframes rotate-lightning{0%{transform:translate(-50%,-50%) rotate(0)}to{transform:translate(-50%,-50%) rotate(360deg)}}.achievement-card.exclusive .achievement-check,.achievement-card.exclusive .achievement-name{color:#e2e8f0;text-shadow:0 0 15px rgba(56,189,248,.3);font-weight:700}.achievement-card.exclusive .achievement-desc{color:#94a3b8}.achievement-card.exclusive .achievement-icon{filter:drop-shadow(0 0 10px rgba(255,255,255,.2))}.badge-exclusive{background:linear-gradient(135deg,#fbbf24,#f59e0b);color:#1a1a1a;font-weight:700}.profile-actions{display:flex;gap:12px;justify-content:center;margin-top:32px}.podium-container{display:flex;justify-content:center;align-items:flex-end;gap:16px;margin:40px 0 60px;position:relative}.podium-item{display:flex;flex-direction:column;align-items:center;text-align:center;position:relative;z-index:1}.podium-item.rank-1{z-index:2;transform:scale(1.15) translateY(-20px)}.podium-item.rank-2{order:-1;transform:translateY(10px)}.podium-item.rank-3{order:1;transform:translateY(10px)}.podium-avatar-container{position:relative;margin-bottom:12px;padding:4px;border-radius:50%;background:var(--bg-surface)}.podium-item.gold .podium-avatar-container{background:linear-gradient(135deg,gold,#f59e0b);box-shadow:0 0 30px #fbbf2466}.podium-item.silver .podium-avatar-container{background:linear-gradient(135deg,#e2e8f0,#94a3b8);box-shadow:0 0 20px #94a3b84d}.podium-item.bronze .podium-avatar-container{background:linear-gradient(135deg,#fdba74,#ca8a04);box-shadow:0 0 20px #ca8a044d}.podium-avatar{width:90px;height:90px;border-radius:50%;border:4px solid var(--bg-base);object-fit:cover;display:block;background:var(--bg-surface)}.podium-item.rank-1 .podium-avatar,.podium-item.rank-1 .podium-avatar-placeholder{width:120px;height:120px}.podium-avatar-placeholder{width:90px;height:90px;border-radius:50%;border:4px solid var(--bg-base);display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--primary) 0%,var(--primary-dark) 100%);color:#fff;font-weight:800;font-size:2rem}.podium-item.rank-1 .podium-avatar-placeholder{font-size:2.5rem}.podium-badge{position:absolute;bottom:0;right:0;transform:translate(-10%,-10%);width:28px;height:28px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:.9rem;font-weight:800;color:#fff;z-index:10;box-shadow:0 4px 6px #0000004d;border:2px solid var(--bg-base)}.podium-item.gold .podium-badge{background:#f59e0b;width:32px;height:32px;font-size:1.1rem}.podium-item.silver .podium-badge{background:#94a3b8}.podium-item.bronze .podium-badge{background:#ca8a04}.podium-name{font-size:.95rem;font-weight:600;color:var(--text-primary);max-width:120px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;margin-bottom:4px}.podium-score{font-size:.9rem;font-weight:500}.podium-item.gold .podium-score{color:#fbbf24}.podium-item.silver .podium-score{color:#cbd5e1}.podium-item.bronze .podium-score{color:#fdba74}.podium-rank-label{position:absolute;top:-40px;font-size:1.1rem;font-weight:700}.podium-item.gold .podium-rank-label{color:#fbbf24}.podium-item.silver .podium-rank-label{color:#94a3b8}.podium-item.bronze .podium-rank-label{color:#ca8a04}.leaderboard-list{display:flex;flex-direction:column;gap:0}.leaderboard-row{display:flex;align-items:center;padding:12px 0;background:transparent;color:var(--text-primary);transition:background .2s;text-decoration:none;border-bottom:1px solid rgba(255,255,255,.05)}.leaderboard-row:hover{background:#ffffff08}.leaderboard-row:last-child{border-bottom:none}.lb-rank-num{width:40px;font-size:1.25rem;font-weight:700;color:var(--text-primary);text-align:center;margin-right:12px}.lb-avatar-small{position:relative;width:48px;height:48px;margin-right:16px}.lb-avatar-small img,.lb-avatar-placeholder-small{width:100%;height:100%;border-radius:50%;object-fit:cover;padding:2px}.lb-avatar-small.green-border img,.lb-avatar-small.green-border .lb-avatar-placeholder-small{border:2px solid var(--success)}.lb-avatar-placeholder-small{display:flex;align-items:center;justify-content:center;font-weight:600;background:linear-gradient(135deg,var(--primary) 0%,var(--primary-dark) 100%);color:#fff}.lb-status-dot{position:absolute;bottom:-2px;right:-2px;width:18px;height:18px;background:#ec4899;border:2px solid var(--bg-base);border-radius:50%;display:flex;align-items:center;justify-content:center}.lb-status-dot.online{background:var(--success)}.lb-status-dot:after{content:"🔥";font-size:10px;color:#fff}.lb-user-info{flex:1;display:flex;flex-direction:column;justify-content:center;overflow:hidden}.lb-name{font-size:1.05rem;font-weight:600;display:flex;align-items:center;gap:8px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.lb-score-col{text-align:right;min-width:80px}.lb-score-label{font-size:.7rem;color:var(--text-muted);display:block;margin-bottom:2px}.lb-score-val{font-size:1.1rem;font-weight:800;color:var(--text-primary)}@media(max-width:768px){html{font-size:14px}.container{padding:0 16px}.navbar{padding:12px 16px;flex-wrap:wrap}.navbar-brand{font-size:1.3rem}.navbar-nav{gap:8px;flex-wrap:wrap;justify-content:flex-end}.navbar-nav li a,.navbar-nav li button{font-size:.8rem;padding:6px 10px}.navbar-user{font-size:.75rem;max-width:80px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.page-header{margin-bottom:20px}.page-title{font-size:1.5rem}.hero{padding:60px 20px}.hero-title{font-size:2rem;margin-bottom:16px}.hero-subtitle{font-size:1rem}.hero-actions{flex-direction:column;gap:12px}.hero-actions .btn{width:100%}.features-grid{grid-template-columns:1fr;gap:16px;padding:0 16px}.sets-grid{grid-template-columns:1fr;gap:16px}.set-card{padding:16px}.set-card-actions{flex-wrap:wrap}.set-card-actions .btn{flex:1;min-width:70px;padding:8px 12px;font-size:.8rem}.flashcard-container{width:calc(100% - 32px);max-width:560px;margin-left:auto;margin-right:auto;box-sizing:border-box}.flashcard{min-height:250px;padding:24px}.flashcard-content{font-size:1.3rem}.study-controls{flex-direction:column;gap:8px}.study-btn{width:100%;padding:12px 20px}.stats-grid{grid-template-columns:repeat(2,1fr)!important;gap:12px}.stat-card{padding:16px 12px}.stat-value{font-size:1.5rem}.stat-label{font-size:.7rem}.achievement-card{padding:12px;gap:12px}.achievement-icon{font-size:1.5rem;width:40px}.achievement-name{font-size:.9rem}.achievement-desc{font-size:.75rem}.leaderboard-item{padding:12px 16px;gap:12px}.lb-rank{font-size:1.2rem;width:32px}.lb-username{font-size:1rem}.lb-stats{flex-direction:column;gap:4px}.lb-streak-value{font-size:1.2rem}.auth-card{margin:20px 16px;padding:24px 20px}.form-group input,.form-group textarea{padding:12px 14px;font-size:.9rem}.card-item{padding:16px}.card-item .form-group{flex:1;min-width:100%}.quiz-container{padding:0 16px}.quiz-options{gap:10px}.quiz-option{padding:14px 16px;font-size:.9rem}.ai-chat-container{width:90vw;max-width:90vw;right:5vw}.ai-chat-messages{max-height:50vh}.btn{padding:10px 16px;font-size:.85rem}.btn-sm{padding:6px 12px;font-size:.75rem}.modal-content{margin:20px;padding:20px;max-height:80vh}.profile-actions{flex-direction:column;gap:10px}.profile-actions .btn{width:100%}}@media(max-width:480px){.navbar-nav{width:100%;justify-content:space-between;margin-top:10px}.hero-title{font-size:1.7rem}.stats-grid{grid-template-columns:1fr 1fr!important}.flashcard{min-height:200px}.flashcard-content{font-size:1.1rem}}.avatar{border-radius:50%;object-fit:cover}.avatar-sm{width:32px;height:32px}.avatar-md{width:48px;height:48px}.avatar-lg{width:100px;height:100px;font-size:2.5rem}.avatar-placeholder{display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--primary) 0%,var(--primary-dark) 100%);color:#fff;font-weight:700}.avatar-container{position:relative;display:inline-block;cursor:pointer}.avatar-overlay{position:absolute;bottom:0;right:0;width:32px;height:32px;background:var(--bg-elevated);border:2px solid var(--border);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:.9rem;opacity:0;transition:opacity var(--transition-base)}.avatar-container:hover .avatar-overlay{opacity:1}.lb-avatar{width:40px;height:40px;border-radius:50%;margin-right:12px;object-fit:cover}.lb-avatar-placeholder{width:40px;height:40px;border-radius:50%;background:linear-gradient(135deg,var(--primary) 0%,var(--primary-dark) 100%);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:600;font-size:1rem;margin-right:12px}.upload-loading{position:fixed;inset:0;background:#000c;display:flex;flex-direction:column;align-items:center;justify-content:center;z-index:9999;color:#fff}.nav-dropdown{position:relative}.nav-avatar-btn{background:none;border:none;cursor:pointer;padding:4px;border-radius:50%;transition:all var(--transition-base)}.nav-avatar-btn:hover{transform:scale(1.05)}.nav-avatar{width:36px;height:36px;border-radius:50%;object-fit:cover;border:2px solid var(--border)}.nav-avatar-placeholder{display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--primary) 0%,var(--primary-dark) 100%);color:#fff;font-weight:600;font-size:.9rem}.dropdown-menu{position:absolute;top:100%;right:0;margin-top:8px;background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius-md);box-shadow:var(--shadow-lg);min-width:160px;z-index:1000;overflow:hidden;animation:fadeInDown .2s ease}@keyframes fadeInDown{0%{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:translateY(0)}}.dropdown-header{padding:12px 16px;font-weight:600;font-size:.9rem;border-bottom:1px solid var(--border);color:var(--text-secondary);display:flex;align-items:center;gap:8px}.admin-tag{background:linear-gradient(135deg,#ef4444,#dc2626);color:#fff;font-size:.6rem;padding:2px 6px;border-radius:4px;font-weight:700;text-transform:uppercase}.dropdown-item{display:flex;align-items:center;gap:8px;width:100%;padding:10px 16px;font-size:.9rem;color:var(--text-primary);background:none;border:none;cursor:pointer;text-align:left;text-decoration:none;transition:background var(--transition-fast)}.dropdown-item:hover{background:var(--bg-hover);color:var(--text-primary)}.dropdown-item-danger:hover{background:#ef444426;color:var(--error)}.section{scroll-margin-top:80px}.section-title{font-size:1.5rem;text-align:center;margin-bottom:24px;color:var(--text-primary)}.about-content{max-width:700px;margin:0 auto;background:var(--bg-elevated);padding:28px 32px;border-radius:var(--radius-lg);border:1px solid var(--border)}.about-content p{margin-bottom:16px;line-height:1.7;color:var(--text-secondary)}.about-content p:last-child{margin-bottom:0}.about-content strong{color:var(--primary-light)}.admin-section{margin-bottom:32px}.admin-section h2{font-size:1.25rem;margin-bottom:16px;color:var(--text-primary)}.badges-preview{display:grid;gap:12px}.badge-preview-item{display:flex;align-items:center;gap:16px;background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius-md);padding:16px}.badge-icon{font-size:2rem;width:48px;text-align:center}.badge-info{flex:1}.badge-name{font-weight:600;color:var(--text-primary)}.badge-desc{font-size:.85rem;color:var(--text-muted)}.badge-id{background:var(--bg-surface);padding:4px 8px;border-radius:var(--radius-sm);font-size:.75rem;color:var(--text-muted)}.users-list{display:grid;gap:12px}.user-card{background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius-md);overflow:hidden;transition:all var(--transition-base)}.user-card.selected{border-color:var(--primary)}.user-info{display:flex;align-items:center;gap:16px;padding:16px;cursor:pointer;transition:background var(--transition-fast)}.user-info:hover{background:var(--bg-hover)}.user-avatar{width:48px;height:48px;border-radius:50%;object-fit:cover}.user-avatar.placeholder{background:var(--primary-subtle);color:var(--primary);display:flex;align-items:center;justify-content:center;font-weight:600;font-size:1.25rem}.user-details{flex:1}.user-name{font-weight:600;color:var(--text-primary);display:flex;align-items:center;gap:8px}.admin-badge{background:linear-gradient(135deg,#ef4444,#dc2626);color:#fff;font-size:.65rem;padding:2px 6px;border-radius:4px;font-weight:700}.user-email{font-size:.85rem;color:var(--text-muted)}.user-badges{display:flex;flex-wrap:wrap;gap:6px;margin-top:8px}.user-badge-tag{background:linear-gradient(135deg,#fbbf2433,#f59e0b1a);border:1px solid #fbbf24;color:#fbbf24;font-size:.75rem;padding:2px 8px;border-radius:12px}.expand-icon{color:var(--text-muted);font-size:.8rem}.user-actions{padding:16px;background:var(--bg-surface);border-top:1px solid var(--border)}.user-actions h4{font-size:.9rem;margin-bottom:12px;color:var(--text-secondary)}.badge-actions{display:grid;gap:10px}.badge-action-item{display:flex;align-items:center;justify-content:space-between;padding:10px 12px;background:var(--bg-elevated);border-radius:var(--radius-sm)}.badge-label{font-size:.9rem;color:var(--text-primary)}.grid-responsive{display:grid;grid-template-columns:1fr;gap:24px}@media(min-width:768px){.grid-responsive{grid-template-columns:repeat(auto-fill,minmax(300px,1fr))}}.form-grid-3{display:grid;grid-template-columns:1fr;gap:16px}@media(min-width:768px){.form-grid-3{grid-template-columns:1fr 1fr 1fr}}.form-grid-2{display:grid;grid-template-columns:1fr;gap:16px}@media(min-width:768px){.form-grid-2{grid-template-columns:1fr 1fr}}.form-grid-1-2{display:grid;grid-template-columns:1fr;gap:10px}@media(min-width:768px){.form-grid-1-2{grid-template-columns:1fr 2fr}}.split-pane-container{display:flex;flex-direction:column;height:calc(100vh - 74px);margin-top:0;overflow:hidden}.split-pane-panel{width:100%!important;height:50%!important;border-right:none!important;border-bottom:1px solid var(--border)}.split-pane-panel.text-panel{border-right:none}@media(min-width:768px){.split-pane-container{flex-direction:row}.split-pane-panel{width:50%!important;height:100%!important;border-bottom:none!important}.split-pane-panel.text-panel{border-right:1px solid var(--border)!important}}.dash{padding-top:8px}.dash__topbar{position:sticky;top:0;z-index:3;display:grid;grid-template-columns:1.1fr 1.4fr auto;align-items:center;gap:14px;padding:14px 16px;margin:12px 0 18px;border-radius:var(--radius-lg);border:1px solid rgba(255,255,255,.1);background:radial-gradient(800px 260px at 10% 20%,rgba(124,58,237,.22),transparent 60%),radial-gradient(700px 240px at 90% 0%,rgba(244,114,182,.16),transparent 55%),#18181fb8;box-shadow:0 18px 40px #00000059,0 0 0 1px #7c3aed14;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px)}.dash__greeting{font-weight:850;letter-spacing:-.03em;font-size:1.3rem}.dash__subtitle{margin-top:2px;color:var(--text-muted);font-size:.9rem}.dash__search{position:relative}.dash__search .form-input{height:44px;padding-left:44px;padding-right:42px;border-color:#ffffff1a;background:#0f0f148c}.dash__search .form-input:focus{border-color:#7c3aede6;box-shadow:0 0 0 3px #7c3aed38}.dash__searchIcon{position:absolute;left:14px;top:50%;transform:translateY(-50%);color:#ffffff8c;pointer-events:none}.dash__searchClear{position:absolute;right:8px;top:50%;transform:translateY(-50%);width:32px;height:32px;border-radius:999px;border:1px solid rgba(255,255,255,.08);background:#18181f8c;color:#ffffffb8;display:grid;place-items:center;cursor:pointer;transition:var(--transition-fast)}.dash__searchClear:hover{background:#ffffff0f;border-color:#ffffff24}.dash__actions{display:flex;gap:10px}.dash__grid{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:18px;align-items:start}.dash__main{min-width:0}.dash__rail{position:sticky;top:86px;display:grid;gap:12px}.dash__stats{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;margin-bottom:16px}.dash-card{position:relative;padding:18px 18px 16px;overflow:hidden;border-color:#ffffff1a;background:radial-gradient(700px 200px at 0% 0%,rgba(255,255,255,.04),transparent 55%),var(--bg-elevated);transition:transform var(--transition-base),border-color var(--transition-base)}.dash-card:hover{transform:translateY(-2px);border-color:#ffffff29}.dash-card:before{content:"";position:absolute;inset:-2px;background:radial-gradient(80% 60% at 10% 20%,rgba(124,58,237,.25),transparent 60%);opacity:0;transition:opacity var(--transition-base);pointer-events:none}.dash-card:hover:before{opacity:1}.dash-card--purple:after,.dash-card--cyan:after,.dash-card--pink:after,.dash-card--green:after{content:"";position:absolute;left:0;top:0;height:100%;width:3px;border-radius:999px;opacity:.9}.dash-card--purple:after{background:linear-gradient(180deg,#a78bfa,#7c3aed)}.dash-card--cyan:after{background:linear-gradient(180deg,#22d3ee,#06b6d4)}.dash-card--pink:after{background:linear-gradient(180deg,#f472b6,#ec4899)}.dash-card--green:after{background:linear-gradient(180deg,#34d399,#22c55e)}.dash-card__label{position:relative;color:#ffffff9e;font-weight:650;font-size:.78rem;letter-spacing:.11em;text-transform:uppercase}.dash-card__value{position:relative;margin-top:10px;font-size:1.85rem;font-weight:850;letter-spacing:-.04em}.dash-card__hint{position:relative;margin-top:2px;color:#ffffff94;font-size:.85rem}.dash__section{margin-top:18px}.dash__section-head{display:flex;align-items:baseline;justify-content:space-between;gap:12px;margin-bottom:10px}.dash__section-title{font-size:1.05rem}.dash__link{color:var(--text-secondary);font-size:.9rem}.dash__link:hover{color:var(--text-primary)}.dash__continue{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.dash-continue{padding:16px;display:grid;gap:10px}.dash-continue__title{font-weight:650}.dash-continue__sub{margin-top:2px;color:var(--text-muted);font-size:.85rem}.dash-continue__bar{height:8px}.dash-continue__actions{display:flex;gap:8px}.dash__shortcuts{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.dash-shortcut{padding:18px;border:1px solid var(--border);transition:transform var(--transition-base),border-color var(--transition-base)}.dash-shortcut:hover{transform:translateY(-2px);border-color:var(--border-hover)}.dash-shortcut__title{font-weight:750;margin-bottom:6px}.dash-shortcut__desc{color:var(--text-secondary);font-size:.9rem}.dash-rail__card{padding:18px}.dash-rail__label{color:var(--text-muted);font-weight:650;text-transform:uppercase;letter-spacing:.08em;font-size:.75rem}.dash-rail__value{margin-top:10px;font-size:1.6rem;font-weight:800}.dash-rail__hint{margin-top:4px;color:var(--text-secondary);font-size:.9rem}@media(max-width:1024px){.dash__grid{grid-template-columns:1fr}.dash__rail{display:none}.dash__stats{grid-template-columns:repeat(2,minmax(0,1fr))}.dash__shortcuts{grid-template-columns:1fr}}@media(max-width:768px){.dash__topbar{grid-template-columns:1fr;gap:10px}.dash__actions{width:100%}.dash__actions .btn{flex:1}.dash__continue{grid-template-columns:1fr}}.mobile-menu-overlay{position:fixed;inset:0;background:#0009;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:998;animation:fadeIn .2s ease-out}.mobile-menu{position:fixed;bottom:0;left:0;right:0;background:var(--bg-elevated);border-top-left-radius:var(--radius-xl);border-top-right-radius:var(--radius-xl);z-index:999;max-height:85vh;overflow-y:auto;animation:slideUp .3s ease-out;box-shadow:0 -4px 20px #0000004d}@keyframes slideUp{0%{transform:translateY(100%);opacity:0}to{transform:translateY(0);opacity:1}}.mobile-menu-profile{display:flex;align-items:center;gap:14px;padding:24px 20px;border-bottom:1px solid var(--border);background:linear-gradient(135deg,rgba(124,58,237,.1) 0%,transparent 100%)}.mobile-menu-avatar{width:52px;height:52px;border-radius:50%;object-fit:cover;border:2px solid var(--primary)}.mobile-menu-avatar-placeholder{display:flex;align-items:center;justify-content:center;background:var(--primary-subtle);color:var(--primary);font-size:1.3rem;font-weight:700}.mobile-menu-user-info{display:flex;flex-direction:column;gap:4px}.mobile-menu-username{font-size:1.1rem;font-weight:600;color:var(--text-primary)}.mobile-menu-admin-tag{display:inline-block;padding:2px 8px;background:var(--primary);color:#fff;font-size:.7rem;font-weight:600;border-radius:10px;width:fit-content}.mobile-menu-nav{padding:12px 0}.mobile-menu-item{display:flex;align-items:center;gap:14px;padding:16px 20px;color:var(--text-primary);font-size:1rem;font-weight:500;transition:background var(--transition-fast);text-decoration:none}.mobile-menu-item:hover{background:var(--bg-hover);color:var(--text-primary)}.mobile-menu-icon{font-size:1.2rem;width:28px;text-align:center}.mobile-menu-footer{padding:16px 20px 32px;border-top:1px solid var(--border)}.mobile-menu-logout{width:100%;padding:14px;background:transparent;border:1px solid var(--error);color:var(--error);font-size:1rem;font-weight:600;border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-fast)}.mobile-menu-logout:hover{background:var(--error);color:#fff}@media(min-width:769px){.mobile-menu-overlay,.mobile-menu{display:none}}.badge{padding:.25rem .75rem;border-radius:12px;font-size:.75rem;font-weight:600;text-transform:uppercase}.badge-beginner{background:#e3f2fd;color:#1976d2}.badge-intermediate{background:#fff3e0;color:#f57c00}.badge-advanced{background:#fce4ec;color:#c2185b}.tag{display:inline-block;padding:.25rem .5rem;background:#f5f5f5;border-radius:4px;font-size:.85rem;color:#666}.layout{display:grid;grid-template-columns:260px 1fr;height:100vh;overflow:hidden;transition:grid-template-columns var(--transition-base)}.layout>.sidebar{grid-column:1}.layout>.layout__main{grid-column:2}.layout--collapsed{grid-template-columns:72px 1fr}.layout--collapsed .sidebar{width:72px}.layout__main{padding:32px;overflow-y:overlay;overflow-x:hidden;background:var(--bg-base);min-width:0}.layout__main{scrollbar-gutter:stable;scrollbar-width:thin;scrollbar-color:rgba(255,255,255,.14) transparent}.layout__main::-webkit-scrollbar{width:10px}.layout__main::-webkit-scrollbar-track{background:transparent}.layout__main::-webkit-scrollbar-thumb{background:#ffffff24;border-radius:999px;border:3px solid var(--bg-base)}.layout__main::-webkit-scrollbar-thumb:hover{background:#fff3}.layout-public{display:grid;grid-template-columns:1fr;height:100vh;overflow:hidden}.sidebar{position:sticky;left:0;top:0;height:100vh;width:260px;background:var(--bg-elevated);border-right:1px solid var(--border);display:flex;flex-direction:column;z-index:100;transition:width .25s ease}.sidebar--collapsed{width:72px}.sidebar--collapsed .sidebar__item,.sidebar--collapsed .sidebar__item--danger,.sidebar--collapsed .sidebar__user{justify-content:center;padding-left:0;padding-right:0}.sidebar__header{display:flex;flex-direction:row;align-items:center;justify-content:space-between;padding:20px 16px;gap:12px;flex-shrink:0;width:100%;box-sizing:border-box}.sidebar--collapsed .sidebar__header{display:flex;flex-direction:row;align-items:center;justify-content:center;padding:16px 10px;gap:0}.sidebar--collapsed .sidebar__logo{display:none}.sidebar__logo{display:flex;flex-direction:row;align-items:center;gap:10px;text-decoration:none;transition:var(--transition-base)}.sidebar__logo-icon{width:36px;height:36px;background:var(--primary);color:#fff;font-weight:700;border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;flex-shrink:0}.sidebar__logo-text{font-size:1.25rem;font-weight:700;color:var(--text-primary);white-space:nowrap;opacity:1;transition:opacity var(--transition-fast)}.sidebar--collapsed .sidebar__logo-text{opacity:0;width:0;overflow:hidden}.sidebar__toggle{width:32px;height:32px;background:transparent;border:none;color:var(--text-muted);border-radius:var(--radius-sm);cursor:pointer;display:grid;place-items:center;transition:var(--transition-fast);flex-shrink:0;padding:0}.sidebar--collapsed .sidebar__toggle{position:static;transform:none;margin:0 auto}.sidebar__toggle svg{display:block}.sidebar__toggle svg,.sidebar__item-icon svg{flex-shrink:0}.sidebar__toggle:hover{background:var(--bg-hover);color:var(--text-secondary)}.sidebar__create{padding:0 12px;margin-bottom:8px;flex-shrink:0}.sidebar__create-btn{width:100%;display:flex;align-items:center;justify-content:center;gap:8px;padding:10px;background:var(--primary);color:#fff;border-radius:var(--radius-md);font-weight:600;text-decoration:none;border:none;cursor:pointer;transition:var(--transition-fast);font-family:var(--font-main);font-size:.875rem}.sidebar__create-btn:hover{background:var(--primary-dark)}.sidebar--collapsed .sidebar__create-btn{width:44px;height:44px;padding:0;gap:0}.sidebar--collapsed .sidebar__create-btn span{display:none}.sidebar__nav{flex:1;overflow-y:auto;overflow-x:hidden;padding:8px 0;scrollbar-gutter:stable;scrollbar-width:thin;scrollbar-color:rgba(255,255,255,.1) transparent}.sidebar__nav::-webkit-scrollbar{width:8px}.sidebar__nav::-webkit-scrollbar-track{background:#ffffff08}.sidebar__nav::-webkit-scrollbar-thumb{background:#ffffff1f;border-radius:999px;border:2px solid rgba(24,24,31,.6)}.sidebar__nav::-webkit-scrollbar-thumb:hover{background:#ffffff26}.sidebar__section{margin-bottom:4px}.sidebar__section-label{text-transform:uppercase;font-size:.7rem;font-weight:600;color:var(--text-muted);letter-spacing:.08em;padding:12px 20px 6px;white-space:nowrap;opacity:1;transition:opacity var(--transition-fast)}.sidebar--collapsed .sidebar__section-label{opacity:0;height:0;padding:0;overflow:hidden}.sidebar__item{display:flex;flex-direction:row;align-items:center;justify-content:flex-start;gap:12px;padding:10px 16px;margin:1px 8px;color:var(--text-secondary);border-radius:var(--radius-sm);text-decoration:none;transition:var(--transition-fast);cursor:pointer;position:relative;white-space:nowrap;width:calc(100% - 16px)}.sidebar__item:hover{background:var(--bg-hover);color:var(--text-primary)}.sidebar__item--active{background:var(--primary-subtle);color:var(--primary-light);box-shadow:inset 3px 0 0 var(--primary)}.sidebar__item--active:hover{color:var(--primary-light)}.sidebar__item--danger{background:none;border:none;width:calc(100% - 16px);font-family:var(--font-main);font-size:.875rem;display:flex;flex-direction:row;align-items:center;justify-content:flex-start;gap:12px;padding:10px 16px;margin:1px 8px;color:var(--text-secondary);border-radius:var(--radius-sm);text-decoration:none;transition:var(--transition-fast);cursor:pointer;position:relative;white-space:nowrap}.sidebar__item--danger:hover{background:#ef44441a;color:#ef4444}.sidebar__item-icon{flex-shrink:0;width:20px;height:20px;display:flex;align-items:center;justify-content:center;opacity:.8;transition:var(--transition-fast)}.sidebar__item--active .sidebar__item-icon,.sidebar__item:hover .sidebar__item-icon{opacity:1}.sidebar__item-label{font-size:.875rem;font-weight:500;white-space:nowrap;opacity:1;transition:opacity var(--transition-fast)}.sidebar--collapsed .sidebar__item-label{opacity:0;width:0;overflow:hidden}.sidebar__footer{border-top:1px solid var(--border);padding:8px 0;margin-top:auto;flex-shrink:0}.sidebar__user{display:flex;flex-direction:row;align-items:center;justify-content:flex-start;gap:10px;padding:10px 16px;margin:2px 8px;border-radius:var(--radius-sm);text-decoration:none;transition:var(--transition-fast);cursor:pointer;width:calc(100% - 16px)}.sidebar__user:hover{background:var(--bg-hover)}.sidebar__avatar{width:34px;height:34px;border-radius:50%;object-fit:cover;flex-shrink:0}.sidebar__avatar--placeholder{background:var(--primary-subtle);color:var(--primary-light);display:flex;align-items:center;justify-content:center;font-weight:600;font-size:.875rem}.sidebar__user-info{display:flex;flex-direction:column;opacity:1;transition:opacity var(--transition-fast);overflow:hidden}.sidebar--collapsed .sidebar__user-info{opacity:0;width:0}.sidebar__user-name{font-size:.85rem;font-weight:600;color:var(--text-primary);white-space:nowrap}.sidebar__user-role{font-size:.7rem;color:var(--text-muted);white-space:nowrap}.bottom-nav{position:fixed;bottom:0;left:0;right:0;display:flex;flex-direction:row;justify-content:space-around;align-items:flex-end;background:var(--bg-elevated);border-top:1px solid var(--border);padding:6px 0 env(safe-area-inset-bottom,6px);z-index:100}.bottom-nav__item{display:flex;flex-direction:column;align-items:center;gap:2px;padding:6px 12px;color:var(--text-muted);text-decoration:none;transition:var(--transition-fast);font-size:.65rem;cursor:pointer}.bottom-nav__item:hover{color:var(--text-secondary)}.bottom-nav__item--active{color:var(--primary-light)}.bottom-nav__item--fab{margin-top:-20px;width:52px;height:52px;border-radius:50%;background:var(--primary);color:#fff;box-shadow:var(--shadow-glow);padding:0;justify-content:center}.bottom-nav__item--fab:hover{background:var(--primary-dark);color:#fff}.bottom-nav__item--fab .bottom-nav__label{display:none}.bottom-nav__icon{display:flex;align-items:center;justify-content:center;width:24px;height:24px}.bottom-nav__label{font-weight:500;white-space:nowrap}@media(max-width:767px){.layout{grid-template-columns:1fr}.sidebar{display:none}.layout__main{padding:16px 16px 80px}}@media(min-width:768px){.bottom-nav{display:none}}@media(min-width:768px)and (max-width:1024px){.layout__main{padding:24px}}@media(min-width:1920px){.layout__main{padding:40px}}.profile-modern{max-width:1100px;margin:0 auto;display:flex;flex-direction:column;gap:24px}.pm-header{background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius-lg);padding:24px;display:flex;flex-direction:row;align-items:center;gap:20px;position:relative;overflow:hidden}.pm-header:before{content:"";position:absolute;inset:0;background:radial-gradient(circle at top right,var(--primary-subtle),transparent 60%);pointer-events:none}.pm-avatar-wrap{position:relative;cursor:pointer;flex-shrink:0;z-index:1}.pm-avatar{width:96px;height:96px;border-radius:50%;object-fit:cover;border:3px solid var(--primary)}.pm-avatar-placeholder{width:96px;height:96px;border-radius:50%;background:var(--primary-subtle);color:var(--primary-light);display:flex;align-items:center;justify-content:center;font-size:2.25rem;font-weight:700;border:3px solid var(--primary)}.pm-avatar-edit{position:absolute;right:0;bottom:4px;width:32px;height:32px;border-radius:50%;background:var(--primary);color:#fff;display:flex;align-items:center;justify-content:center;border:2px solid var(--bg-elevated)}.pm-identity{flex:1;min-width:0;z-index:1}.pm-name{font-size:1.5rem;font-weight:700;color:var(--text-primary);margin:0 0 4px}.pm-meta{font-size:.85rem;color:var(--text-muted);margin-bottom:12px}.pm-level-row{display:flex;flex-direction:row;align-items:center;gap:12px;font-size:.85rem;color:var(--text-secondary);margin-bottom:6px}.pm-level-tag{background:var(--primary);color:#fff;padding:2px 10px;border-radius:var(--radius-full, 9999px);font-weight:700;font-size:.75rem}.pm-xp-bar{height:10px;background:var(--bg-hover);border-radius:9999px;overflow:hidden}.pm-xp-fill{height:100%;background:linear-gradient(90deg,var(--primary),var(--primary-light));border-radius:9999px;transition:width .4s ease}.pm-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}.pm-stat{background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius-md);padding:18px;display:flex;flex-direction:column;gap:6px;transition:var(--transition-fast)}.pm-stat:hover{border-color:var(--primary);transform:translateY(-2px)}.pm-stat-icon{width:36px;height:36px;border-radius:var(--radius-sm);background:var(--primary-subtle);color:var(--primary-light);display:flex;align-items:center;justify-content:center;margin-bottom:4px}.pm-stat-value{font-size:1.6rem;font-weight:700;color:var(--text-primary);line-height:1.1}.pm-stat-label{font-size:.78rem;color:var(--text-muted);text-transform:uppercase;letter-spacing:.05em}.pm-section{background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius-lg);padding:20px 22px}.pm-section-head{display:flex;flex-direction:row;align-items:center;justify-content:space-between;margin-bottom:14px}.pm-section-title{font-size:1.05rem;font-weight:700;color:var(--text-primary);display:flex;flex-direction:row;align-items:center;gap:8px}.pm-section-badge{background:var(--primary-subtle);color:var(--primary-light);font-size:.75rem;font-weight:600;padding:4px 10px;border-radius:9999px}.pm-heatmap{display:grid;grid-template-columns:repeat(53,1fr);gap:3px;overflow-x:auto;padding-bottom:6px}.pm-heat-cell{width:100%;aspect-ratio:1;border-radius:3px;background:var(--bg-hover);min-width:10px}.pm-heat-cell[data-level="1"]{background:#6366f140}.pm-heat-cell[data-level="2"]{background:#6366f173}.pm-heat-cell[data-level="3"]{background:#6366f1b3}.pm-heat-cell[data-level="4"]{background:var(--primary)}.pm-heatmap-legend{display:flex;flex-direction:row;align-items:center;gap:6px;margin-top:10px;font-size:.75rem;color:var(--text-muted)}.pm-heatmap-legend .pm-heat-cell{width:12px;height:12px;min-width:12px}.pm-ach-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:12px}.pm-ach{display:flex;flex-direction:row;align-items:center;gap:12px;padding:12px 14px;border-radius:var(--radius-md);background:var(--bg-base);border:1px solid var(--border);transition:var(--transition-fast)}.pm-ach.unlocked{border-color:var(--primary);background:var(--primary-subtle)}.pm-ach.locked{opacity:.55;filter:grayscale(.4)}.pm-ach-icon{width:40px;height:40px;border-radius:var(--radius-sm);background:var(--bg-elevated);display:flex;align-items:center;justify-content:center;font-size:1.25rem;flex-shrink:0}.pm-ach-body{min-width:0;flex:1}.pm-ach-name{font-size:.9rem;font-weight:600;color:var(--text-primary);margin-bottom:2px}.pm-ach-desc{font-size:.75rem;color:var(--text-muted);line-height:1.35}.pm-ach-check{color:var(--primary-light);flex-shrink:0}.pm-ach.exclusive{border-color:#facc15;background:linear-gradient(135deg,#facc151f,#facc150a)}.pm-actions{display:flex;flex-direction:row;gap:12px;flex-wrap:wrap}.pm-btn{display:inline-flex;align-items:center;gap:8px;padding:10px 18px;border-radius:var(--radius-md);font-weight:600;font-size:.9rem;text-decoration:none;border:1px solid transparent;cursor:pointer;transition:var(--transition-fast)}.pm-btn--primary{background:var(--primary);color:#fff}.pm-btn--primary:hover{background:var(--primary-dark)}.pm-btn--ghost{background:var(--bg-elevated);color:var(--text-primary);border-color:var(--border)}.pm-btn--ghost:hover{background:var(--bg-hover)}.pm-uploading{position:absolute;inset:0;background:#0009;display:flex;align-items:center;justify-content:center;z-index:5;border-radius:var(--radius-lg)}@media(max-width:768px){.pm-header{flex-direction:column;align-items:flex-start}.pm-stats{grid-template-columns:repeat(2,1fr)}.pm-avatar,.pm-avatar-placeholder{width:80px;height:80px}}