:root{--bg: #f6f7f9;--surface: #ffffff;--text: #1a1f2b;--muted: #5c6673;--border: #e3e7ec;--primary: #2f6df6;--primary-dark: #1e57d6;--primary-soft: #e8f0ff;--success: #1f9d55;--success-soft: #e3f6ec;--danger: #d64545;--danger-soft: #fbe8e8;--ru: #7a5cff;--ru-soft: #efeaff;--gold: #f5a623;--radius: 14px;--radius-sm: 10px;--ctrl-h: 40px;--ring: rgba(47, 109, 246, .25);--shadow: 0 1px 2px rgba(20, 30, 50, .06), 0 6px 20px rgba(20, 30, 50, .06);--shadow-sm: 0 1px 2px rgba(20, 30, 50, .06);font-family:system-ui,-apple-system,Segoe UI,Roboto,Inter,sans-serif;color:var(--text);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}@media (prefers-color-scheme: dark){:root{--bg: #14171d;--surface: #1c2029;--text: #eef1f6;--muted: #9aa4b2;--border: #2c313c;--primary: #5b8dff;--primary-dark: #4277f0;--primary-soft: #1e2740;--success: #3ecb7c;--success-soft: #16301f;--danger: #f16a6a;--danger-soft: #351a1a;--ru: #a48bff;--ru-soft: #241f3d;--ring: rgba(91, 141, 255, .32);--shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .28);--shadow-sm: 0 1px 2px rgba(0, 0, 0, .3)}}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);line-height:1.55}a{color:var(--primary);text-decoration:none}a:hover{text-decoration:underline}h1,h2,h3{line-height:1.2}h1{font-size:1.65rem;font-weight:800;letter-spacing:-.02em;margin:0 0 .7rem}h2{font-size:1.2rem;font-weight:700;letter-spacing:-.01em;margin:1.4rem 0 .6rem}h3{font-size:1rem;font-weight:700;margin:1.1rem 0 .4rem}.app{min-height:100vh;display:flex;flex-direction:column}.header{background:var(--surface);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:10}.header__inner{max-width:900px;margin:0 auto;padding:.7rem 1rem;display:flex;align-items:center;gap:1rem;flex-wrap:wrap}.brand{font-weight:800;font-size:1.2rem;color:var(--text);letter-spacing:-.02em}.brand span{color:var(--primary)}.nav{display:flex;gap:.35rem;flex-wrap:wrap;flex:1}.nav a{color:var(--muted);padding:.35rem .6rem;border-radius:8px;font-size:.92rem;font-weight:500}.nav a:hover{background:var(--primary-soft);text-decoration:none}.nav a.active{color:var(--primary);background:var(--primary-soft)}.nav-toggle{display:none;border:1px solid var(--border);background:var(--surface);color:var(--text);border-radius:8px;padding:.3rem .65rem;font-size:1.15rem;line-height:1;cursor:pointer}@media (max-width: 640px){.header__inner{flex-wrap:wrap;gap:.6rem}.brand{margin-right:auto}.langtoggle{order:2}.nav-toggle{display:inline-flex;order:3}.nav{order:4;flex-basis:100%;display:none;flex-direction:column;gap:.15rem;padding-top:.5rem;border-top:1px solid var(--border)}.nav--open{display:flex}.nav a{padding:.65rem .5rem;font-size:1rem;border-radius:8px}}.main{flex:1;max-width:780px;width:100%;margin:0 auto;padding:1.5rem 1rem 3rem}.footer{border-top:1px solid var(--border);background:var(--surface);color:var(--muted);font-size:.85rem;text-align:center;padding:1rem}.footer a{color:var(--muted);text-decoration:underline}.langtoggle{display:inline-flex;align-items:stretch;border:1px solid var(--border);border-radius:var(--radius-sm);overflow:hidden;background:var(--surface)}.langtoggle button{border:none;background:transparent;color:var(--muted);padding:0 .7rem;cursor:pointer;font-weight:600;font-size:.85rem;font-family:inherit;transition:background .12s,color .12s}.langtoggle button+button{border-left:1px solid var(--border)}.langtoggle button:hover:not(.active){background:var(--primary-soft);color:var(--primary-dark)}.langtoggle button.active{background:var(--primary);color:#fff}.btn{display:inline-flex;align-items:center;justify-content:center;height:var(--ctrl-h);border:1px solid transparent;border-radius:var(--radius-sm);padding:0 1.1rem;font-size:.98rem;font-weight:600;font-family:inherit;cursor:pointer;background:var(--primary);color:#fff;box-shadow:var(--shadow-sm);transition:background .15s,box-shadow .15s,transform .05s}.btn:hover{background:var(--primary-dark)}.btn:active{transform:translateY(1px)}.btn:focus-visible{outline:none;box-shadow:0 0 0 3px var(--ring)}.btn:disabled{opacity:.5;cursor:not-allowed;box-shadow:none}.btn--ghost{background:var(--surface);color:var(--primary);border-color:var(--border)}.btn--ghost:hover{background:var(--primary-soft);border-color:var(--primary-soft)}.btn--active{background:var(--primary-soft);color:var(--primary-dark);border-color:var(--primary)}.btn--sm{height:34px;padding:0 .85rem;font-size:.88rem}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:1.25rem}.card+.card{margin-top:1rem}.badge{display:inline-block;font-size:.75rem;font-weight:600;padding:.15rem .5rem;border-radius:20px;background:var(--primary-soft);color:var(--primary-dark)}.q__meta{display:flex;align-items:center;gap:.5rem;flex-wrap:wrap;margin-bottom:.75rem}.star{margin-left:auto;background:none;border:none;cursor:pointer;font-size:1.4rem;line-height:1;color:var(--muted);padding:0 .2rem;transition:transform .08s}.star:hover{transform:scale(1.15)}.star--on{color:#f5a623}.q__image{display:block;max-width:100%;max-height:320px;width:auto;margin:0 auto .75rem;border-radius:8px}.q__text{font-size:1.15rem;font-weight:600;margin:0 0 .25rem}.q__ru{color:var(--ru);background:var(--ru-soft);border-radius:8px;padding:.4rem .6rem;font-size:.95rem;margin-bottom:.9rem}.q__ru--sub{display:block;color:var(--ru);font-size:.85rem;margin-top:.15rem}.q__alt{border-radius:8px;padding:.4rem .6rem;font-size:.98rem;margin:0 0 .6rem}.q__alt--ru{color:var(--ru);background:var(--ru-soft)}.q__alt--fr,.q__alt--en{color:var(--muted);background:transparent;padding:.1rem 0}.q__alt--sub{display:block;font-size:.85rem;margin-top:.2rem}.q__alt--sub.q__alt--ru{color:var(--ru)}.q__alt--sub.q__alt--fr,.q__alt--sub.q__alt--en{color:var(--muted)}.langvis{display:inline-flex;align-items:center;gap:.4rem}.langvis__label{font-size:.85rem;color:var(--muted)}.options{display:flex;flex-direction:column;gap:.5rem;margin:.5rem 0}.option{text-align:left;border:1px solid var(--border);background:var(--surface);color:var(--text);border-radius:10px;padding:.7rem .9rem;cursor:pointer;font-size:1rem;transition:border-color .12s,background .12s}.option:hover:not(:disabled){border-color:var(--primary);box-shadow:var(--shadow-sm)}.option:focus-visible{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px var(--ring)}.option.selected{border-color:var(--primary);background:var(--primary-soft)}.option.correct{border-color:var(--success);background:var(--success-soft)}.option.wrong{border-color:var(--danger);background:var(--danger-soft)}.option:disabled{cursor:default}.feedback{margin-top:.75rem;padding:.75rem .9rem;border-radius:10px;font-size:.95rem}.feedback--ok{background:var(--success-soft);color:var(--success)}.feedback--ko{background:var(--danger-soft);color:var(--danger)}.feedback__exp{margin-top:.4rem;color:var(--text)}.rowbtns{display:flex;gap:.6rem;flex-wrap:wrap;margin-top:1rem;align-items:center}.toolbar{display:flex;gap:.6rem;flex-wrap:wrap;align-items:center;margin-bottom:1rem}.toolbar .btn,.toolbar .btn--sm,.toolbar .langtoggle{height:var(--ctrl-h)}.stat{display:flex;gap:1.5rem;flex-wrap:wrap}.stat__num{font-size:1.8rem;font-weight:800;color:var(--primary)}.stat__label{color:var(--muted);font-size:.85rem}.muted{color:var(--muted)}.center{text-align:center}select,input[type=text],input[type=search]{height:var(--ctrl-h);border:1px solid var(--border);background:var(--surface);color:var(--text);border-radius:var(--radius-sm);padding:0 .8rem;font-size:.95rem;font-family:inherit;max-width:100%;min-width:0;box-sizing:border-box;transition:border-color .15s,box-shadow .15s}.toolbar select,.toolbar input[type=text],.toolbar input[type=search]{flex:1 1 11rem;min-width:0;text-overflow:ellipsis}select{-moz-appearance:none;appearance:none;-webkit-appearance:none;padding-right:2.1rem;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 14 14' fill='none' stroke='%2394a3b8' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M3 5l4 4 4-4'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right .7rem center;cursor:pointer}select:hover,input[type=text]:hover{border-color:var(--muted)}select:focus,input[type=text]:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px var(--ring)}.dots{display:flex;gap:4px;flex-wrap:wrap;margin-bottom:1rem}.dot{width:14px;height:14px;border-radius:50%;border:1px solid var(--border);background:var(--surface)}.dot--done{background:var(--muted);border-color:var(--muted)}.dot--current{background:var(--primary);border-color:var(--primary)}table.gloss{width:100%;border-collapse:collapse}table.gloss th,table.gloss td{text-align:left;padding:.5rem .6rem;border-bottom:1px solid var(--border);font-size:.95rem}table.gloss th{color:var(--muted);font-size:.8rem;text-transform:uppercase;letter-spacing:.03em}.gloss__ru{color:var(--ru);font-weight:600}.gloss__translit{color:var(--muted);font-style:italic;font-size:.85rem}.sq{display:inline-block;width:15px;height:15px;border-radius:3px;border:1px solid var(--border);vertical-align:middle;cursor:pointer;transition:transform .08s}a.sq:hover{transform:scale(1.25);outline:2px solid var(--primary);outline-offset:1px;text-decoration:none}.sq--green{background:var(--success);border-color:var(--success)}.sq--red{background:var(--danger);border-color:var(--danger)}.sq--gray{background:var(--bg)}.sqgrid{display:flex;flex-wrap:wrap;gap:4px}.legend{display:inline-flex;align-items:center;gap:.35rem;font-size:.85rem;color:var(--muted)}.ticketrow__head{display:flex;align-items:center;gap:.6rem;margin-bottom:.6rem}.ticketrow__title{font-weight:700;color:var(--text)}.ticketrow__title:hover{color:var(--primary);text-decoration:none}.ticketrow__go{font-weight:400;font-size:.82rem;color:var(--muted)}.ticketrow__title:hover .ticketrow__go{color:var(--primary)}.badge--ok{background:var(--success-soft);color:var(--success)}.sign{display:flex;gap:1rem;align-items:flex-start}.sign__img{width:84px;height:84px;flex-shrink:0;object-fit:contain;background:#fff;border-radius:8px;padding:4px}.sign__body{flex:1;min-width:0}.sign__head{display:flex;align-items:center;gap:.5rem;flex-wrap:wrap;margin-bottom:.35rem}.sign__desc{margin:.25rem 0 0;font-size:.95rem}.penalty{margin:.5rem 0 0;padding:.4rem .6rem;border-radius:8px;background:var(--danger-soft);color:var(--danger);font-size:.95rem}@media (max-width: 640px){.sign{flex-direction:column}}.lesson__intro{font-size:1.05rem;margin-top:0}.lesson__list{padding-left:1.2rem}.lesson__list li{margin:.4rem 0}.lesson__list--warn li::marker{content:"⚠ ";color:var(--danger)}.lesson__summary{margin-top:1rem;padding:.6rem .8rem;border-radius:8px;background:var(--success-soft);color:var(--text)}.lesson__figure{margin:1rem 0;text-align:center}.lesson__diagram{display:block;width:100%;max-width:360px;margin:0 auto .4rem;border-radius:10px;border:1px solid var(--border)}.lesson__figure figcaption{font-size:.88rem}.lesson__signs{display:flex;flex-wrap:wrap;gap:.75rem}.lesson__sign{margin:0;width:120px;text-align:center}.lesson__sign img{width:72px;height:72px;object-fit:contain;background:#fff;border-radius:8px;padding:4px}.lesson__sign figcaption{font-size:.78rem;color:var(--muted);margin-top:.25rem;line-height:1.25}.coach{display:flex;gap:1.25rem;align-items:flex-start}.coach__gauge{text-align:center;min-width:116px}.coach__pct{font-size:2.4rem;font-weight:800;line-height:1}.coach__bar{height:6px;border-radius:999px;background:var(--border);margin-top:.55rem;overflow:hidden}.coach__bar span{display:block;height:100%;border-radius:999px;transition:width .3s}.coach__body{flex:1;min-width:0}.coach__verdict{margin:0 0 .35rem;font-weight:600}.coach__weak{margin-top:.7rem}.coach__weak ul{margin:.3rem 0 0;padding-left:1.1rem}.coach__weak li{margin:.25rem 0}@media (max-width: 640px){.coach{flex-direction:column;align-items:stretch}.coach__gauge{min-width:0}}.flash{width:100%;min-height:220px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:.5rem;text-align:center;padding:2rem 1.25rem;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);cursor:pointer;font-family:inherit;transition:transform .06s,box-shadow .15s,border-color .15s}.flash:hover{border-color:var(--primary)}.flash:active{transform:translateY(1px)}.flash:focus-visible{outline:none;box-shadow:0 0 0 3px var(--ring)}.flash--back{background:var(--primary-soft)}.flash__term{font-size:1.85rem;font-weight:700;color:var(--text);line-height:1.2}.flash__term--ru{color:var(--ru)}.flash__translit{font-style:italic;color:var(--muted);font-size:1rem}.flash__hint{margin-top:.6rem;font-size:.75rem;color:var(--muted);text-transform:uppercase;letter-spacing:.06em}.prose p{margin:.6rem 0}.prose ul{padding-left:1.2rem}.prose li{margin:.3rem 0}.paywall{border:1px solid var(--gold);background:linear-gradient(180deg,rgba(245,166,35,.06),transparent)}.paywall__badge{display:inline-block;font-size:.78rem;font-weight:600;color:var(--gold);letter-spacing:.04em;text-transform:uppercase;margin-bottom:.4rem}.paywall__title{margin:0 0 .3rem}.authform{display:flex;flex-direction:column;gap:.75rem;margin-top:.75rem}.authform__row{display:flex;flex-direction:column;gap:.25rem}.authform__row span{font-size:.85rem;color:var(--muted, #667)}.authform__row input{height:var(--ctrl-h, 40px);padding:0 .7rem;border:1px solid var(--border, #d9dee8);border-radius:var(--radius-sm);background:var(--card-bg, #fff);color:inherit;font-size:1rem}.authform__row input:focus{outline:none;border-color:var(--accent, #2f6df6);box-shadow:0 0 0 3px var(--ring)}.home__understand{margin:1rem auto;max-width:34rem;padding:.9rem 1rem;border:1px solid var(--gold);border-radius:var(--radius);background:linear-gradient(180deg,rgba(245,166,35,.08),transparent)}.home__understand p{margin:0 0 .6rem;font-weight:500}.brand{display:inline-flex;align-items:center;gap:.55rem}.brand__logo{width:30px;height:30px;flex:none;border-radius:9px}.brand__name{font-weight:800;letter-spacing:-.01em}.account__head{display:flex;align-items:center;gap:.9rem;margin-bottom:1rem}.account__avatar{width:52px;height:52px;flex:none;border-radius:50%;display:grid;place-items:center;background:var(--primary);color:#fff;font-weight:800;font-size:1.4rem}.account__title{margin:0;font-size:1.5rem}.account__email{margin:0;font-size:.95rem}.account__until{margin:.6rem 0 .2rem}.account__section{margin-top:0}.account__status{display:flex;flex-direction:column;align-items:flex-start}.pill{display:inline-block;padding:.25rem .7rem;border-radius:999px;font-size:.82rem;font-weight:600;background:var(--border, #e6e9f0);color:var(--text)}.pill--ok{background:var(--success-soft);color:var(--success)}