: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 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.mini-meta{margin-left:auto;font-size:11px;font-weight:500;padding:2px 16px 2px 8px;border-radius:999px;background:#1d2642;color:#c9d2e4;flex:0 0 auto;line-height:1.1;display:inline-flex;align-items:center;justify-content:center;letter-spacing:.2px}.collapse-header .mini-meta.inline{margin-left:8px;padding-left:8px;padding-right:12px}.collapse-body{padding:0 16px 20px}.collapse-body+.collapse-body{border-top:1px solid #222946}.dropdown{position:relative}.dropdown-toggle{background:transparent;border:none;color:var(--muted);padding:8px 10px;border-radius:8px;font:inherit;cursor:pointer;display:flex;align-items:center;gap:6px}.dropdown-toggle:hover,.dropdown.open>.dropdown-toggle{background:var(--panel);color:var(--text)}.dropdown-menu{position:absolute;left:0;top:100%;margin-top:6px;background:var(--panel);border:1px solid #222946;border-radius:10px;padding:6px;display:flex;flex-direction:column;gap:2px;min-width:220px;box-shadow:0 6px 18px -4px #0006;z-index:30}.dropdown-menu a{padding:8px 10px;border-radius:8px;white-space:nowrap}.dropdown-menu a:hover{background:var(--panel-2);color:var(--text)}.dropdown-menu a.active{background:var(--primary);color:#fff}.dropdown:not(.open)>.dropdown-menu{display:none}.sidebar-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:linear-gradient(to bottom,#00000061,#0000 30%,#0000 70%,#00000061);-webkit-backdrop-filter:none;backdrop-filter:none;opacity:0;animation:none;transition:opacity .2s ease;z-index:1300}.app-header.mobile-open+.sidebar-overlay,.sidebar-overlay{opacity:1}.mobile-sidebar{position:fixed;top:0;bottom:0;left:0;right:0;width:100vw!important;max-width:100vw!important;background:#121728;border-right:none;transform:translate(-100%);transition:transform .2s ease,opacity .2s ease;display:flex;flex-direction:column;z-index:1400;opacity:0}.mobile-sidebar.open{transform:translate(0);box-shadow:none;opacity:1}.mobile-sidebar-inner{flex:1;display:flex;flex-direction:column;overflow-y:auto;padding-bottom:40px}.ms-header{display:flex;align-items:center;justify-content:space-between;padding:18px 22px;border-bottom:1px solid #222946;font-weight:600}.ms-brand{font-weight:700}.ms-close{background:transparent;border:none;color:var(--text);font-size:24px;line-height:1;cursor:pointer;padding:4px 8px}.ms-section{padding:18px 22px;display:flex;flex-direction:column;gap:6px}.ms-section+.ms-section{border-top:1px solid #1c2339}.ms-section-title{font-size:11px;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);font-weight:600}.mobile-sidebar a,.mobile-sidebar button.linklike{color:var(--text);text-decoration:none;font-size:15px;padding:8px 10px;border-radius:8px;text-align:left;background:transparent;border:none}.mobile-sidebar a.active{background:var(--primary);color:#fff}.mobile-sidebar a:hover,.mobile-sidebar button.linklike:hover{background:#1d2540}.ms-footer{margin-top:auto;padding:16px 22px;font-size:11px;opacity:.6;border-top:1px solid #1c2339}.desktop-nav,.desktop-only{display:flex}@media (max-width:820px){.desktop-nav,.desktop-only{display:none}nav#main-nav.desktop-nav{display:none!important;max-height:0!important;overflow:hidden!important}.app-header.mobile-open nav#main-nav{max-height:0!important}}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@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}}@media (max-width:720px){.collapse-header{padding:12px 14px;font-size:14px}.collapse-header .mini-meta{font-size:10px;padding:1px 5px}}@media (max-width:640px){.collapse-header{flex-wrap:wrap}.collapse-header .mini-meta{margin-left:0;margin-top:4px}}