.page-header{text-align:center;margin-bottom:2rem}.page-header h1{margin:0 0 .5rem;font-size:2rem;color:var(--text)}.page-header p{color:var(--muted);font-size:1.1rem}.level-selector{display:flex;gap:12px;flex-wrap:wrap;justify-content:center;margin-bottom:2rem}.level-btn{padding:.75rem 1.5rem;border:2px solid var(--border-strong);border-radius:var(--radius);background:var(--surface);color:var(--text);font-weight:600;cursor:pointer;transition:background .2s ease,color .2s ease,transform .2s ease}.level-btn:hover{background:var(--surface-2);transform:translateY(-2px)}.level-btn.active{background:var(--surface-brand);border:1px solid var(--primary)}.step-selector{margin:30px 0;text-align:center;border:1px solid var(--border-strong);background:var(--surface)}.step-selector h3{color:var(--text);margin-bottom:20px;font-size:1.3rem}.step-buttons{display:flex;justify-content:center;gap:15px;flex-wrap:wrap;margin-bottom:20px}.step-btn{padding:12px 24px;border:2px solid var(--border-strong);border-radius:8px;background:var(--surface);color:var(--text);font-weight:600;cursor:pointer;transition:background .2s ease,color .2s ease,transform .2s ease}.step-btn:hover{background:var(--surface-2);transform:translateY(-2px)}.step-btn.active{background:var(--surface-brand);color:var(--text);border:1px solid var(--border-strong)}.validated-icon{color:var(--success);margin-left:6px;font-weight:700}.explanation-type-selector{background:var(--surface-2);padding:20px;border-radius:12px;border:1px solid var(--border);margin-top:20px}.explanation-type-selector h4{color:var(--text);margin:0 0 15px;font-size:1.1rem}.explanation-buttons{display:flex;justify-content:center;gap:12px;flex-wrap:wrap}.explanation-btn{padding:10px 20px;border:2px solid var(--border);border-radius:8px;background:var(--surface);color:var(--text);font-weight:500;cursor:pointer;transition:background .2s ease,color .2s ease,transform .2s ease;font-size:.95rem}.explanation-btn:hover{background:var(--surface-2);transform:translateY(-1px)}.explanation-btn.active{background:var(--primary);color:var(--text-inverse);border-color:var(--primary)}.loading-logo-container{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:40px;gap:20px;text-align:center;width:100%}.loading-logo-spin{width:80px;height:80px;animation:logo-spin 2s linear infinite;filter:drop-shadow(0 0 15px rgba(var(--primary-rgb),.4))}.loading-logo-container p{font-weight:600;color:var(--primary);font-size:1.1rem;letter-spacing:.5px;margin:0}@keyframes logo-spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}*,*:before,*:after{box-sizing:border-box}html,body,#root{height:100%}:root{font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;--bg: radial-gradient(90dvh circle, #ffffff 0%, #f5f4fc 40%, #faf4f4 75%, #eee7e7 100%), conic-gradient(from 210deg at 80% 8%, rgba(126, 120, 231, .045), transparent 30%, rgba(6,182,212,.045) 60%, transparent 75%);--bg-accent: #f8fafc;--text: #0a1022;--text-secondary: #49566a;--text-inverse: #fff;--muted: #6b7280;--surface: #F2F0EF;--surface-2: #f0e7e2;--surface-gradient: linear-gradient(180deg, rgb(8, 2, 112), transparent 45%);--surface-hover: #eef2ff;--progress-bg: color-mix(in srgb, var(--border) 85%, transparent);--surface-grad-1: linear-gradient(180deg, color-mix(in srgb, var(--primary) 6%, var(--surface)) 0%, var(--surface) 100%);--surface-grad-2: linear-gradient(180deg, color-mix(in srgb, var(--accent) 6%, var(--surface)) 0%, var(--surface) 100%);--surface-brand: linear-gradient(135deg, color-mix(in srgb, var(--primary) 10%, var(--surface)) 0%, color-mix(in srgb, var(--accent) 8%, var(--surface-2)) 100%);--surface-glass: linear-gradient(135deg, var(--surface-2), var(--surface));--panel-surface: linear-gradient(180deg, color-mix(in srgb, var(--primary) 1%, var(--surface)) 0%, color-mix(in srgb, var(--primary) .5%, var(--surface)) 100%);--border: #f1ebff;--border-soft: color-mix(in srgb, #e6eaf2 75%, #ffffff);--border-strong: #c6d2ff;--border-contrast: color-mix(in srgb, var(--primary) 28%, #94a3b8 72%);--border-gradient: linear-gradient(135deg, #c7d2fe 0%, #a7f3d0 45%, #fbcfe8 100%);--primary: #4f46e5;--primary-2: #06b6d4;--secondary: #f97316;--accent: #f43f5e;--info: #06b6d4;--success: #16a34a;--danger: #ef4444;--warning: #f59e0b;--brand-gradient: linear-gradient(135deg, #4f46e5 0%, #22d3ee 50%, #f43f5e 100%);--cta-gradient: linear-gradient(135deg, #625be2 0%, #8b5cf6 100%);--cta-gradient-hover: linear-gradient(135deg, #7872e2 0%, #ab88fc 100%);--stat-gradient-blue: linear-gradient(180deg, #60a5fa 0%, #3b82f6 100%);--stat-gradient-orange: linear-gradient(180deg, #fbbf24 0%, #f59e0b 100%);--radius: 12px;--radius-lg: 20px;--shadow: 0 10px 28px rgba(15,23,42,.1);--shadow-sm: 0 6px 18px rgba(15,23,42,.08);--shadow-md: 0 8px 22px rgba(15,23,42,.14);--shadow-card: 0 10px 26px rgba(15,23,42,.12);--shadow-hover: 0 16px 40px rgba(15,23,42,.18);--btn-radius: var(--radius);--btn-primary-bg: var(--cta-gradient);--btn-primary-hover-bg: var(--cta-gradient);--btn-primary-text: var(--text-inverse);--btn-primary-hover: linear-gradient(135deg, #4338ca 0%, #7c3aed 100%);--btn-shadow: 0 8px 20px rgba(79,70,229,.28);--btn-hover-shadow: 0 12px 28px rgba(79,70,229,.34);--btn-active-shadow: 0 6px 18px rgba(79,70,229,.3);--btn-secondary-bg: var(--surface);--btn-secondary-text: var(--text);--btn-secondary-border: var(--border-contrast);--btn-secondary-hover-bg: #eef2ff;--btn-ghost-text: var(--primary);--btn-ghost-hover-bg: color-mix(in srgb, var(--primary) 12%, var(--surface));--btn-danger-bg: var(--danger);--btn-success-bg: var(--success);--btn-info-bg: var(--info);--btn-warning-bg: var(--warning);--btn-validate-bg: linear-gradient(135deg, color-mix(in srgb, var(--primary) 10%, #4338ca) 0%, color-mix(in srgb, var(--primary) 45%, var(--primary-2)) 100%);--btn-validate-hover-bg: linear-gradient(135deg, var(--primary) 0%, color-mix(in srgb, var(--primary) 32%, var(--primary-2)) 100%);--btn-reset-bg: linear-gradient(135deg, #ae91ff 0%, color-mix(in srgb, #ef4444 34%, var(--accent)) 100%);--btn-reset-hover-bg: linear-gradient(135deg, color-mix(in srgb, #f37a7a 10%, #bca4fd) 0%, color-mix(in srgb, #f38888 48%, var(--accent)) 100%);--btn-random-bg: linear-gradient(135deg, #823fff 0%, color-mix(in srgb, #823fff 34%, var(--secondary)) 100%);--btn-random-hover-bg: linear-gradient(135deg, color-mix(in srgb, #9962ff 10%, #a0677f) 0%, color-mix(in srgb, #823fff 50%, var(--secondary)) 100%);--btn-not-learned-bg: linear-gradient(135deg, #823fff 0%, color-mix(in srgb, #823fff 34%, var(--secondary)) 100%);--btn-not-learned-hover-bg: linear-gradient(135deg, color-mix(in srgb, #823fff 10%, #a0677f) 0%, color-mix(in srgb, #823fff 50%, var(--secondary)) 100%);--ring-strong-color: color-mix(in srgb, var(--primary) 40%, transparent);--glow-primary: 0 10px 32px color-mix(in srgb, var(--primary) 22%, transparent)}.card-vivid{background:linear-gradient(var(--surface),var(--surface)) padding-box,var(--border-gradient) border-box,var(--surface-gradient);border:1px solid transparent;border-radius:var(--radius-lg);box-shadow:var(--shadow-card)}.card-vivid:hover{box-shadow:var(--shadow-hover)}.item{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);transition:transform .15s ease,box-shadow .15s ease,border-color .15s ease,background .15s ease}.item:hover{border-color:var(--border-contrast);background:var(--surface-hover);box-shadow:var(--shadow-hover);transform:translateY(-1px)}.btn-primary:hover{background:var(--btn-primary-hover);box-shadow:var(--btn-hover-shadow),var(--glow-primary)}.progress{height:8px;border-radius:999px;background:var(--progress-bg);overflow:hidden;border:1px solid var(--border-soft)}.progress>span{display:block;height:100%;background:linear-gradient(90deg,var(--primary) 0%,var(--primary-2) 100%);box-shadow:inset 0 -4px 8px #ffffff59}a{font-weight:500;color:var(--primary);text-decoration:none}a:hover{opacity:.9}body{margin:0;min-width:320px;min-height:100svh;color:var(--text);background:var(--bg);transition:background-color .25s ease,color .25s ease}.app-layout{min-height:100svh;display:flex;flex-direction:column}.bottom-sticky-bar{position:sticky;bottom:calc(12px + env(safe-area-inset-bottom));z-index:1000;width:100%;display:flex;justify-content:space-between;align-items:flex-end;gap:10px;padding-left:max(12px,(100vw - 1200px) / 2 + 12px);padding-right:max(20px,(100vw - 1200px) / 2 + 20px);pointer-events:none;height:0;overflow:visible;margin-bottom:12px}.sticky-left-controls{display:flex;align-items:flex-end;gap:10px}.bottom-sticky-bar>*{pointer-events:auto}.main-content{width:100%;max-width:1200px;margin:0 auto auto;padding:1rem;padding-bottom:96px}@media (max-width: 768px){.main-content{padding:.75rem;padding-bottom:84px}}@media (max-width: 480px){.main-content{padding:.5rem;padding-bottom:80px}}h1{font-size:2rem;line-height:1.2;font-weight:700;letter-spacing:.2px}h2{font-size:1.6rem;line-height:1.25;font-weight:600;margin:0 0 8px}h3{font-size:1.15rem;line-height:1.3;font-weight:600;margin:0 0 6px}p{margin:0 0 8px}.muted{color:var(--muted)}button{font-family:inherit}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid color-mix(in srgb,var(--primary) 30%,transparent);outline-offset:2px}input,select,textarea{font-family:inherit;border:1px solid var(--border);border-radius:var(--radius);padding:.5rem .75rem;transition:border-color .2s ease,box-shadow .2s ease}input:focus,select:focus,textarea:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px color-mix(in srgb,var(--primary) 12%,transparent)}.btn{font-family:inherit;display:inline-block;border-radius:var(--btn-radius);padding:.6rem 1.2rem;font-weight:500;cursor:pointer;transition:background .2s ease,box-shadow .2s ease,border-color .2s ease,color .2s ease;border:none}.btn:focus-visible{outline:3px solid color-mix(in srgb,var(--primary) 30%,transparent);outline-offset:2px}.btn-primary{background:var(--btn-primary-bg);color:var(--btn-primary-text);box-shadow:var(--btn-shadow)}.btn-primary:hover{background:var(--btn-primary-hover);box-shadow:var(--btn-hover-shadow)}.btn-primary:active{box-shadow:var(--btn-active-shadow)}.btn-secondary{background:var(--btn-secondary-bg);color:var(--btn-secondary-text);border:1px solid var(--btn-secondary-border);box-shadow:var(--shadow-sm)}.btn-secondary:hover{background:var(--btn-secondary-hover-bg)}.btn-danger{background:var(--btn-danger-bg);color:var(--text-inverse);box-shadow:var(--shadow-sm)}.btn-danger:hover{filter:brightness(.96)}:root[data-theme=dark]{--bg: radial-gradient(90dvh circle at 80% 18%, #0b1220 0%, #121735 55%, #0e1327 100%), conic-gradient(from 0deg at 10% 10%, rgba(139,92,246,.16), transparent 35%, rgba(34,211,238,.12) 65%, transparent 80%);--bg-accent: #0f1726;--text: #e6edf7;--text-secondary: #a8b3cf;--surface: #0f1726;--surface-2: #111a2b;--surface-3: #171a36;--surface-gradient: linear-gradient(180deg, rgba(139,92,246,.18), transparent 50%);--surface-hover: #131c30;--surface-glass: linear-gradient(135deg, color-mix(in srgb, #ffffff 6%, var(--surface-2)), var(--surface));--panel-surface: linear-gradient(180deg, color-mix(in srgb, var(--primary) 6%, var(--surface)) 0%, color-mix(in srgb, var(--primary) 3%, var(--surface)) 100%);--border: #24324a;--border-soft: #1d2740;--border-strong: #475569;--border-contrast: color-mix(in srgb, var(--primary) 40%, #334155 60%);--primary: #8b5cf6;--primary-hover: #7c3aed;--secondary: #fb923c;--accent: #f472b6;--success: #34d399;--danger: #fb7185;--warning: #fbbf24;--cta-gradient: linear-gradient(135deg, #7c3aed 0%, #6366f1 100%);--shadow: 0 10px 30px rgba(0,0,0,.45);--shadow-sm: 0 8px 22px rgba(0,0,0,.4);--shadow-md: 0 10px 28px rgba(0,0,0,.48);--shadow-card: 0 12px 32px rgba(0,0,0,.52);--shadow-hover: 0 16px 40px rgba(0,0,0,.58);--ring-strong: 0 0 0 3px color-mix(in srgb, var(--primary) 50%, transparent);--glow-primary: 0 12px 36px color-mix(in srgb, var(--primary) 35%, transparent)}:root[data-theme=dark] body{background:var(--bg);color:var(--text)}:root[data-theme=dark] a{color:var(--primary)}@media (prefers-reduced-motion: reduce){*{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important;scroll-behavior:auto!important}}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-card)}.modal-overlay{position:fixed;inset:0;background:#0206178c;display:flex;align-items:center;justify-content:center;z-index:2000;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}.modal-content{background:var(--surface);border-radius:var(--radius-lg);border:1px solid var(--border);box-shadow:0 20px 48px #0f172a59;width:90%;max-width:400px;max-height:90vh;overflow-y:auto;animation:modalSlideIn .28s ease-out}@keyframes modalSlideIn{0%{opacity:0;transform:scale(.9) translateY(-20px)}to{opacity:1;transform:scale(1) translateY(0)}}.modal-header{display:flex;justify-content:space-between;align-items:center;padding:24px 24px 16px;border-bottom:1px solid var(--border)}.modal-header h2{margin:0;font-size:1.5rem;font-weight:700;color:var(--text)}.close-btn{background:none;border:none;font-size:1.5rem;cursor:pointer;color:var(--muted);padding:4px;border-radius:50%;width:32px;height:32px;display:flex;align-items:center;justify-content:center;transition:all .2s ease}.close-btn:hover{background:var(--surface-2);color:var(--text)}.login-form{padding:24px}.form-group input{width:100%;padding:12px 16px;border:1px solid var(--border);border-radius:8px;font-size:1rem;box-sizing:border-box;background:var(--surface);color:var(--text)}.form-group input:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px color-mix(in srgb,var(--primary) 12%,transparent)}.form-group input::placeholder{color:#9ca3af}.error-message{background:color-mix(in srgb,var(--danger) 12%,var(--surface));border:1px solid color-mix(in srgb,var(--danger) 35%,transparent);color:var(--danger);padding:12px 16px;border-radius:8px;margin-bottom:16px;font-size:.9rem;display:flex;align-items:center;gap:8px;cursor:pointer;transition:background .2s ease,box-shadow .2s ease,transform .2s ease;margin-top:8px}.form-options{display:flex;align-items:center;justify-content:space-between;gap:12px;margin:8px 24px 0}.remember-option{display:inline-flex;align-items:center;gap:8px;color:var(--muted);font-size:.9rem}.forgot-password-link{background:none;border:none;color:var(--primary);font-weight:600;cursor:pointer;padding:6px 0;border-radius:6px;transition:color .2s ease}.forgot-password-link:hover{color:color-mix(in srgb,var(--primary) 70%,transparent);text-decoration:underline}.login-btn{width:100%;background:var(--primary);color:var(--text-inverse);border:none;border-radius:10px;padding:12px 16px;font-weight:700;font-size:1rem;letter-spacing:.2px;cursor:pointer;transition:transform .2s ease,box-shadow .2s ease,opacity .2s ease}.login-btn:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 8px 20px color-mix(in srgb,var(--primary) 28%,transparent)}.login-btn:active:not(:disabled){transform:translateY(0);opacity:.7;cursor:not-allowed}.login-btn:disabled{opacity:.7;cursor:not-allowed;filter:grayscale(.15)}.separator{display:flex;align-items:center;text-align:center;margin:20px 0;color:var(--muted);font-size:.85rem;font-weight:600;text-transform:uppercase;letter-spacing:.5px}.separator:before,.separator:after{content:"";flex:1;border-bottom:1px solid var(--border)}.separator:before{margin-right:12px}.separator:after{margin-left:12px}.google-login-container{display:flex;justify-content:center;width:100%}.google-login-container>div{width:100%!important}.modal-footer{padding:16px 24px 24px;text-align:center;border-top:1px solid var(--border)}.modal-footer p{margin:0 0 12px;color:var(--muted);font-size:.9rem}.register-link{background:none;border:2px solid var(--primary);color:var(--primary);padding:10px 20px;border-radius:8px;font-weight:600;cursor:pointer;transition:background .2s ease,color .2s ease,transform .2s ease;font-size:.9rem}.register-link:hover{background:var(--primary);color:var(--text-inverse);transform:translateY(-1px)}@media (max-width: 480px){.modal-content{width:95%;margin:20px}.modal-header,.login-form,.modal-footer{padding-left:20px;padding-right:20px}}.register-modal{max-width:600px;max-height:90vh}.register-form{padding:24px;max-height:70vh;overflow-y:auto}.form-row{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-bottom:20px}.form-group label{display:block;margin-bottom:8px;font-weight:600;color:var(--text);font-size:.9rem}.form-group input,.form-group select{width:100%;padding:12px 16px;border:1px solid var(--border);border-radius:8px;font-size:1rem;box-sizing:border-box;background:var(--surface);color:var(--text)}.form-group input:focus,.form-group select:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px color-mix(in srgb,var(--primary) 12%,transparent)}.register-btn{width:100%;background:var(--primary);color:var(--text-inverse);border:none;padding:14px 20px;border-radius:8px;font-size:1rem;font-weight:600;cursor:pointer;transition:background .2s ease,box-shadow .2s ease,transform .2s ease;margin-top:8px}.register-btn:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 8px 20px color-mix(in srgb,var(--primary) 28%,transparent)}.register-btn:active:not(:disabled){transform:translateY(0)}.register-btn:disabled{opacity:.7;cursor:not-allowed}.login-link{background:none;border:2px solid var(--primary);color:var(--primary);padding:10px 20px;border-radius:8px;font-weight:600;cursor:pointer;transition:background .2s ease,color .2s ease,transform .2s ease;font-size:.9rem}.login-link:hover{background:var(--primary);color:var(--text-inverse);transform:translateY(-1px)}@media (max-width: 768px){.register-modal{width:95%;max-width:none;margin:10px}.form-row{grid-template-columns:1fr;gap:0}.register-form{padding:20px;max-height:75vh}}@media (max-width: 480px){.register-form{padding:16px}.form-group input,.form-group select{padding:10px 12px;font-size:.9rem}.register-btn{padding:12px 16px;font-size:.9rem}}.register-form::-webkit-scrollbar{width:6px}.register-form::-webkit-scrollbar-track{background:var(--surface-2);border-radius:3px}.register-form::-webkit-scrollbar-thumb{background:color-mix(in srgb,var(--border) 80%,transparent);border-radius:3px}.register-form::-webkit-scrollbar-thumb:hover{background:color-mix(in srgb,var(--text-secondary) 50%,transparent)}.app-header{width:100%;background:var(--surface);color:var(--text);position:sticky;top:0;z-index:1000;border-bottom:1px solid var(--border-strong);-webkit-backdrop-filter:saturate(1.1) blur(6px);backdrop-filter:saturate(1.1) blur(6px)}.header-content{max-width:1200px;margin:0 auto;padding:16px 24px;display:flex;align-items:center;justify-content:space-between;gap:20px}.mobile-menu-btn{display:none;width:42px;height:36px;border-radius:8px;border:1px solid var(--border-strong);background:var(--surface);align-items:center;justify-content:center;gap:4px;padding:0 8px;cursor:pointer}.mobile-menu-btn .bar{display:block;width:100%;height:2px;background:var(--text)}.logo{font-size:1.3rem;font-weight:700;color:var(--text);text-decoration:none;display:flex;align-items:center;gap:8px;transition:opacity .2s ease}.logo:hover{opacity:.85}.logo img{height:32px;width:auto;display:block}.main-nav{display:flex;align-items:center;justify-content:center;gap:12px;flex-wrap:wrap;padding:8px 12px;border-radius:999px;background:linear-gradient(135deg,var(--surface-2) 0%,var(--surface) 100%);border:1px solid var(--border-strong);box-shadow:var(--shadow-sm);-webkit-backdrop-filter:saturate(1.2) blur(10px);backdrop-filter:saturate(1.2) blur(10px)}.main-nav a{position:relative;display:inline-flex;align-items:center;justify-content:center;gap:6px;color:var(--text);text-decoration:none;padding:10px 18px;border-radius:999px;font-weight:600;background:var(--surface);border:1px solid var(--border-strong);box-shadow:var(--shadow-sm);transition:transform .2s ease,box-shadow .2s ease,background-color .2s ease,color .2s ease}.main-nav a:hover{transform:translateY(-3px);background-color:var(--surface-hover);box-shadow:var(--shadow)}.main-nav a:active{transform:translateY(-1px)}.main-nav a.active{background:var(--surface-brand);color:var(--text);box-shadow:0 10px 25px color-mix(in srgb,var(--primary) 22%,transparent);border:1px solid var(--border-strong)}.main-nav a[aria-selected=true]{background:var(--surface-brand);color:var(--text);box-shadow:0 10px 25px color-mix(in srgb,var(--primary) 22%,transparent);border:1px solid var(--primary)}.main-nav a.active:hover,.main-nav a[aria-selected=true]:hover{background:var(--surface-brand);color:var(--text)}.main-nav .nav-item.disabled,.drawer-nav .nav-item.disabled{color:var(--text-muted);opacity:.5;cursor:not-allowed;pointer-events:none;-webkit-user-select:none;user-select:none}.main-nav .nav-item.disabled{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:10px 18px;border-radius:999px;font-weight:600;background:var(--surface);border:1px solid var(--border-strong);box-shadow:var(--shadow-sm)}.drawer-nav .nav-item.disabled{padding:12px 10px;border-radius:8px;border:1px solid var(--border-strong);background:var(--surface-2)}.main-nav a:focus-visible{outline:3px solid color-mix(in srgb,var(--primary) 35%,transparent);outline-offset:2px}:root[data-theme=dark] .main-nav{box-shadow:var(--shadow-md)}:root[data-theme=dark] .main-nav a{border-color:var(--border);box-shadow:0 6px 16px #0006}:root[data-theme=dark] .main-nav a.active{box-shadow:0 12px 30px color-mix(in srgb,var(--primary) 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usernameModalIn{0%{opacity:0;transform:translateY(20px) scale(.95)}to{opacity:1;transform:translateY(0) scale(1)}}.username-modal-header{text-align:center;margin-bottom:24px}.username-modal-header h2{margin:0 0 12px;font-size:1.75rem;font-weight:800;background:linear-gradient(135deg,var(--primary),#a78bfa);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}.username-modal-header p{color:var(--muted);line-height:1.5;margin:0}.username-form .form-group{margin-bottom:24px}.username-form label{display:block;margin-bottom:8px;font-weight:600;font-size:.95rem;color:var(--text)}.input-wrapper{position:relative;display:flex;flex-direction:column}.username-form input{width:100%;padding:14px 16px;background:var(--surface-2);border:2px solid var(--border);border-radius:12px;font-size:1.1rem;color:var(--text);transition:all .2s ease;box-sizing:border-box}.username-form input:focus{outline:none;border-color:var(--primary);background:var(--surface);box-shadow:0 0 0 4px color-mix(in srgb,var(--primary) 15%,transparent)}.availability-hint{position:absolute;right:12px;top:50%;transform:translateY(-50%);font-size:.85rem;font-weight:600}.availability-hint.success{color:#10b981}.availability-hint.error{color:#ef4444}.field-hint{margin:8px 0 0;font-size:.8rem;color:var(--muted)}.submit-username-btn{width:100%;padding:14px;background:var(--primary);color:#fff;border:none;border-radius:12px;font-size:1rem;font-weight:700;cursor:pointer;transition:all .2s ease}.submit-username-btn:hover:not(:disabled){background:color-mix(in srgb,var(--primary) 85%,black);transform:translateY(-2px);box-shadow:0 10px 20px -5px color-mix(in srgb,var(--primary) 30%,transparent)}.submit-username-btn:disabled{opacity:.5;cursor:not-allowed;filter:grayscale(.5)}