:root{--bg:#f6f8fc;--surface:#fff;--ink:#12203a;--ink-soft:#5b6b85;--line:#e4e9f2;--brand:#0e7490;--brand-soft:#e0f2f8;--accent:#f59e0b;--ok:#16a34a;--bad:#dc2626;--radius:14px;--shadow:0 1px 2px rgba(18,32,58,.05),0 10px 30px rgba(18,32,58,.07)}@media (prefers-color-scheme:dark){:root{--bg:#0d1526;--surface:#16223a;--ink:#eaf0fa;--ink-soft:#9db0cc;--line:#26344f;--brand:#22a5c4;--brand-soft:#14344a}}*{box-sizing:border-box}html[dir=rtl] body{font-family:Segoe UI,Tahoma,sans-serif}body{margin:0;background:var(--bg);color:var(--ink);font-family:Segoe UI,system-ui,-apple-system,sans-serif;line-height:1.55}a{color:inherit;text-decoration:none}button{cursor:pointer}button,input,select,textarea{font:inherit}.container{max-width:980px;margin:0 auto;padding:0 20px 64px}header.site{background:var(--surface);border-bottom:1px solid var(--line);position:-webkit-sticky;position:sticky;top:0;z-index:20}header.site .inner{max-width:980px;margin:0 auto;padding:12px 20px;display:flex;align-items:center;gap:18px}header.site .brand{font-weight:800;font-size:17px}header.site .brand span{color:var(--brand)}header.site nav{display:flex;gap:16px;font-size:15px;flex:1 1}.coin-pill,header.site nav a:hover{color:var(--brand)}.coin-pill{background:var(--brand-soft);font-weight:700;border-radius:99px;padding:5px 12px;font-size:14px}.card{background:var(--surface);border-radius:var(--radius);box-shadow:var(--shadow);padding:22px;margin-bottom:16px}.grid{display:grid;grid-gap:16px;gap:16px}.grid.two{grid-template-columns:repeat(auto-fit,minmax(300px,1fr))}h1.page{font-size:26px;margin:28px 0 4px}p.sub{color:var(--ink-soft);margin:0 0 22px}.btn{border:none;border-radius:10px;padding:11px 20px;font-weight:600;font-size:15px;transition:filter .15s}.btn:hover:not(:disabled){filter:brightness(1.08)}.btn:disabled{opacity:.5;cursor:not-allowed}.btn.primary{background:var(--brand);color:#fff}.btn.ghost{background:transparent;color:var(--ink);border:1px solid var(--line)}.btn.ok{background:var(--ok);color:#fff}.btn.big{width:100%;padding:17px;font-size:17px;font-weight:800}.badge{display:inline-block;padding:3px 10px;border-radius:99px;font-size:12px;font-weight:600;background:var(--brand-soft);color:var(--brand)}.badge.ok{background:rgba(22,163,74,.14);color:var(--ok)}.badge.bad{background:rgba(220,38,38,.12);color:var(--bad)}.article-card{display:block;transition:transform .15s}.article-card:hover{transform:translateY(-2px)}.article-card h3{margin:0 0 6px;font-size:18px}.article-card .meta{color:var(--ink-soft);font-size:13px}.option{display:block;width:100%;text-align:start;margin-bottom:8px;border:2px solid var(--line);background:var(--surface);color:var(--ink);border-radius:10px;padding:12px 14px}.option:hover:not(:disabled){border-color:var(--brand)}.option.correct{border-color:var(--ok);background:rgba(22,163,74,.1)}.option.wrong{border-color:var(--bad);background:rgba(220,38,38,.08)}.empty{color:var(--ink-soft);text-align:center;padding:48px 0}.spinner{width:26px;height:26px;border:3px solid var(--line);border-top-color:var(--brand);border-radius:50%;animation:spin .8s linear infinite;margin:40px auto}@keyframes spin{to{transform:rotate(1turn)}}.bubbles{display:flex;flex-direction:column;gap:10px;margin-bottom:20px}.bubble{max-width:78%;padding:11px 15px;border-radius:16px;font-size:15px;direction:ltr;text-align:start}.bubble.assistant{background:var(--brand-soft);align-self:flex-start}.bubble.user{align-self:flex-end}.bubble.user,.mic{background:var(--brand);color:#fff}.mic{width:82px;height:82px;border-radius:50%;border:none;font-size:30px;margin:0 auto;display:grid;place-items:center;box-shadow:var(--shadow)}.mic.recording{background:var(--bad);animation:pulse 1.2s infinite}@keyframes pulse{0%,to{transform:scale(1)}50%{transform:scale(1.07)}}.vocab-chips{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:18px}.pay-primary{margin-bottom:10px}.pay-more{margin-top:18px;border-top:1px solid var(--line);padding-top:14px}.pay-more summary{cursor:pointer;color:var(--ink-soft);font-size:14px;list-style:none}.pay-more summary::-webkit-details-marker{display:none}.pay-more summary:before{content:"▸ "}.pay-more[open] summary:before{content:"▾ "}.pay-alt{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:12px 0;border-bottom:1px solid var(--line);font-size:14px}.pay-alt .delay{color:var(--ink-soft);font-size:12px}.plan-toggle{display:flex;gap:10px;margin-bottom:18px}.plan-toggle button{flex:1 1;border:2px solid var(--line);background:var(--surface);color:var(--ink);border-radius:12px;padding:14px;text-align:center}.plan-toggle button.active{border-color:var(--brand);background:var(--brand-soft)}.plan-toggle .price{font-size:22px;font-weight:800}.plan-toggle .per{font-size:12px;color:var(--ink-soft)}