:root{--bg: #0b1020;--panel: #151a2c;--panel-2: #20263d;--text: #e8edf6;--muted: #9aa3b2;--primary: #5b8cff;--success: #2db37c;--error: #e25555;--warning: #ffcc66;--border: #222946;--accent: var(--primary)}*{box-sizing:border-box}html,body,#root{height:100%}body{margin:0;font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,Cantarell,Noto Sans,Helvetica,Arial,"Apple Color Emoji","Segoe UI Emoji";background:var(--bg);color:var(--text)}.container{max-width:980px;margin:0 auto;padding:0 16px}.app-header{position:sticky;top:0;z-index:10;background:#0b1020b3;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-bottom:1px solid #222946}.header-inner{display:flex;align-items:center;justify-content:space-between;gap:8px;min-height:56px}.brand{color:var(--text);text-decoration:none;font-weight:700}nav{display:flex;gap:10px;flex-wrap:wrap}nav a{color:var(--muted);text-decoration:none;padding:8px 10px;border-radius:8px}nav a.active{background:var(--panel);color:var(--text)}.subtle-path{font-size:12px;color:var(--muted);padding:2px 16px 8px}.app-root main{padding:16px 0 40px}.footer{opacity:.7;font-size:12px;padding-bottom:24px}.home .hero{display:flex;flex-direction:column;gap:6px;margin:10px 0 18px}.muted{color:var(--muted)}.modes-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.mode{display:block;background:var(--panel);padding:16px;border-radius:12px;color:var(--text);text-decoration:none;border:1px solid #222946}.mode:hover{border-color:#2b3356}.mode.outline{background:transparent}.train .card{background:var(--panel);border:1px solid #222946;border-radius:16px;padding:16px}.card-header{display:flex;align-items:center;justify-content:space-between;gap:10px}.qa{display:flex;flex-direction:column;gap:14px}.prompt{font-size:26px;font-weight:700;padding:8px 0}.options{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.option{padding:12px;border-radius:12px;background:var(--panel-2);color:var(--text);border:1px solid #2a3154}.option.selected{outline:2px solid var(--primary)}.option.correct{background:#2db37c2e;border-color:var(--success)}.option.wrong{background:#e255552e;border-color:var(--error)}.input-mode{display:flex;gap:10px}input[type=text]{flex:1;background:var(--panel-2);color:var(--text);border:1px solid #2a3154;border-radius:10px;padding:10px 12px;font-size:16px}button{-webkit-appearance:none;-moz-appearance:none;appearance:none;border:1px solid #2a3154;background:var(--panel-2);color:var(--text);border-radius:10px;padding:10px 14px;cursor:pointer}button.ghost{background:transparent}button.primary{background:var(--primary);border-color:transparent;color:#fff}button.danger{background:#c64b4b;border-color:transparent;color:#fff}button:disabled{opacity:.6;cursor:not-allowed}.alert{padding:10px 12px;border-radius:10px;border:1px solid transparent}.alert.success{background:#2db37c2e;border-color:var(--success)}.alert.error{background:#e255552e;border-color:var(--error)}.actions{display:flex;justify-content:flex-end}.progress-page .stats{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;margin:10px 0}.stat{background:var(--panel);border:1px solid #222946;border-radius:12px;padding:12px}.stat .value{font-size:22px;font-weight:700}.stat .label{color:var(--muted)}.progressbar{position:relative;height:16px;border-radius:999px;background:#1a2240;border:1px solid #222946;overflow:hidden}.progressbar .bar{position:absolute;left:0;top:0;bottom:0;background:linear-gradient(90deg,var(--primary),#7aa3ff)}.progressbar .percent{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;align-items:center;justify-content:center;font-size:12px;color:#d8def0}.cards-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.mini-card{background:var(--panel);border:1px solid #222946;border-radius:12px;padding:10px;display:flex;flex-direction:column;gap:6px}.mini-card.learned{outline:2px solid rgba(45,179,124,.4)}.mini-card .row{display:flex;align-items:center;justify-content:space-between;gap:10px}.mini-card .row.small{font-size:12px;color:var(--muted)}.mini-card .pt{font-weight:700}.auth-page{min-height:calc(100vh - 120px);display:flex;align-items:center;justify-content:center;padding:40px 16px}.auth-panel{width:100%;max-width:360px;background:var(--panel);border:1px solid #222946;border-radius:18px;padding:28px 26px;display:flex;flex-direction:column;gap:14px}.auth-panel h1{margin:0 0 4px;font-size:24px}.auth-form{display:flex;flex-direction:column;gap:12px}.auth-form label{display:flex;flex-direction:column;gap:6px;font-size:14px;color:var(--muted)}.auth-form input{background:var(--panel-2);border:1px solid #2a3154;border-radius:10px;padding:10px 12px;font-size:15px;color:var(--text)}.switch-mode{margin-top:4px;display:flex;justify-content:center}.switch-mode button{font-size:13px}.user-box{display:flex;align-items:center;gap:10px}.user-box .username{font-weight:600;font-size:14px}button.linklike{background:transparent;border:none;padding:0;color:var(--primary);cursor:pointer}button.linklike:hover{text-decoration:underline}.user-box a{background:var(--primary);color:#fff;text-decoration:none;font-weight:600;padding:6px 14px;border-radius:10px;display:inline-block;line-height:1}.user-box a:visited,.user-box a:active,.user-box a:hover{color:#fff}.menu-toggle{display:none;flex-direction:column;gap:4px;background:transparent;border:none;padding:8px 6px;cursor:pointer}.menu-toggle span{width:22px;height:2px;background:var(--text);display:block;border-radius:2px;transition:.3s}.app-header.mobile-open .menu-toggle span:nth-child(2){opacity:0}.app-header.mobile-open .menu-toggle span:first-child{transform:translateY(6px) rotate(45deg)}.app-header.mobile-open .menu-toggle span:last-child{transform:translateY(-6px) rotate(-45deg)}.categories-filter{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:12px}.chip{-webkit-appearance:none;-moz-appearance:none;appearance:none;cursor:pointer;background:transparent;border:1px solid var(--border);color:var(--muted);padding:4px 10px;border-radius:999px;font-size:12px;line-height:1.2;transition:.18s background,.18s color,.18s border-color,.18s box-shadow}.chip:hover{border-color:var(--primary);color:var(--text)}.chip.active{background:var(--accent);border-color:var(--accent);color:#fff;box-shadow:0 0 0 2px #5b8cff59}.chip:focus-visible{outline:2px solid var(--primary);outline-offset:2px}.categories-filter .chip{font-weight:500}@media (max-width: 720px){.modes-grid,.options,.cards-grid{grid-template-columns:1fr}.prompt{font-size:22px}nav{overflow:auto}}@media (max-width: 820px){.menu-toggle{display:flex}nav#main-nav{position:absolute;left:0;top:56px;right:0;background:#0f1426f7;display:flex;flex-direction:column;padding:12px 16px;gap:4px;max-height:0;overflow:hidden;border-bottom:1px solid #222946;transition:max-height .35s ease}.app-header.mobile-open nav#main-nav{max-height:340px}nav#main-nav a{padding:10px 8px;border-radius:10px}.user-box{margin-left:auto}.header-inner{gap:4px}}