:root{color-scheme:light dark;--bg:#f7f4ee;--sf:#fffefa;--ink:#21332e;--mute:#60716a;--ln:#dce4dc;--accent:#268b75;--accent-ink:#fff;--en:#3766c0;--de:#a16b12;--fr:#b84376;--ru:#16806a;--shadow:0 20px 55px rgba(36,62,51,.09);box-sizing:border-box;padding-top:env(safe-area-inset-top,0px);padding-bottom:env(safe-area-inset-bottom,0px)}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){--bg:#101b1d;--sf:#1b292a;--ink:#ecf3ed;--mute:#aabeb4;--ln:#344747;--accent:#76d8bd;--accent-ink:#102a23;--en:#90b0ff;--de:#efc66c;--fr:#f492ba;--ru:#77dfb9;--shadow:0 22px 60px rgba(0,0,0,.25)}}
:root[data-theme="light"]{color-scheme:light}
:root[data-theme="dark"]{color-scheme:dark;--bg:#101b1d;--sf:#1b292a;--ink:#ecf3ed;--mute:#aabeb4;--ln:#344747;--accent:#76d8bd;--accent-ink:#102a23;--en:#90b0ff;--de:#efc66c;--fr:#f492ba;--ru:#77dfb9;--shadow:0 22px 60px rgba(0,0,0,.25)}
html{scroll-padding-top:env(safe-area-inset-top,0px)}
*,*::before,*::after{box-sizing:inherit}
body{margin:0;background:radial-gradient(circle at 12% 0%,rgba(98,183,148,.14),transparent 36rem),radial-gradient(circle at 95% 10%,rgba(237,177,127,.11),transparent 32rem),var(--bg);color:var(--ink);font:16px/1.5 Onest,system-ui,sans-serif;min-height:100vh}
.app{max-width:1120px;margin:0 auto;padding:28px 24px 64px}
header{display:flex;align-items:center;justify-content:space-between;gap:18px;margin-bottom:28px}
.header-actions{display:flex;align-items:center;justify-content:flex-end;gap:8px;flex-wrap:wrap}
#ui-lang{border:1px solid var(--ln);border-radius:14px;min-width:44px;min-height:44px;font-size:13px;font-weight:700}
.brand{display:flex;align-items:center;gap:12px;font:600 27px Spectral,Georgia,serif}
#who{display:block;max-width:28vw;min-height:44px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;text-align:left;border:1px solid var(--ln);border-radius:14px;background:var(--sf);padding:7px 14px;color:var(--ink);font:inherit;font-size:14px;font-weight:600;cursor:pointer}
#who:hover{border-color:var(--ink)}
@media(max-width:600px){header{align-items:flex-start;flex-wrap:wrap;gap:10px}.header-actions{width:100%;justify-content:flex-start}.header-actions #tot{margin-right:auto}.app{padding:18px 14px 52px}#who{max-width:45vw}.brand{font-size:25px}}
@media(max-width:360px){.brand{font-size:22px}.header-actions{gap:5px}#tot{white-space:nowrap;padding:5px 8px;font-size:11px}#who{font-size:12px;padding:6px 9px}}
.mark{display:grid;grid-template-columns:repeat(2,10px);gap:3px}
.pill{font-size:13px;color:var(--mute);border:1px solid var(--ln);border-radius:99px;padding:5px 12px;background:var(--sf)}
.pill b{color:var(--ink)}
.tabs{display:flex;margin-bottom:22px;border-bottom:1px solid var(--ln)}
.tabs button{border:0;background:none;color:var(--mute);font:inherit;font-weight:600;padding:10px 2px;margin:0 18px -1px 0;cursor:pointer;border-bottom:3px solid transparent}
.tabs button.on{color:var(--accent);border-color:var(--accent)}
.dir{display:flex;gap:8px;align-items:center}
select,input{font:inherit;color:var(--ink);background:var(--sf);border:1px solid var(--ln);border-radius:14px;padding:11px 14px;width:100%;min-width:0;min-height:46px}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
.stats{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin:12px 0 16px}
.btn{font:inherit;font-weight:600;border-radius:15px;border:1px solid var(--ln);background:var(--sf);color:var(--ink);padding:12px 16px;cursor:pointer;min-height:46px;transition:transform .16s ease,box-shadow .16s ease,background .16s ease}
.btn:hover{transform:translateY(-1px);box-shadow:0 7px 18px rgba(0,0,0,.08)}
.btn.pri{background:var(--accent);border-color:var(--accent);color:var(--accent-ink)}
.btn small{display:block;font-weight:400;font-size:12px;opacity:.7}
.sw{flex:none;padding:10px 14px}
.row{display:flex;gap:10px;margin-top:14px}.row .btn{flex:1}
.grade-actions .btn{min-height:62px}
@media(max-width:520px){.grade-actions{display:grid;grid-template-columns:1fr 1fr}.grade-actions .btn{min-height:68px}}
.fc{background:linear-gradient(145deg,var(--sf),color-mix(in srgb,var(--sf) 92%,var(--accent)));border:1px solid var(--ln);border-radius:26px;padding:clamp(24px,4vw,46px);min-height:330px;display:flex;flex-direction:column;gap:22px;box-shadow:var(--shadow)}
.fc.empty{justify-content:center;align-items:center}
.fc.empty .word{color:var(--ink)}
.welcome{align-items:stretch;text-align:left;min-height:0;padding:26px;gap:14px}
.welcome .word{font-size:clamp(29px,6vw,40px)}
.welcome p{margin:0;color:var(--mute)}
.welcome-steps{display:grid;gap:10px;margin:6px 0}
.welcome-step{display:flex;align-items:flex-start;gap:12px}
.welcome-step b{display:grid;place-items:center;flex:none;width:28px;height:28px;border-radius:50%;background:var(--ink);color:var(--bg);font:700 13px Onest,system-ui,sans-serif}
.welcome-step span{padding-top:2px}
.welcome .btn{align-self:flex-start}
.empty-actions{display:flex;gap:10px;flex-wrap:wrap;justify-content:center;margin-top:4px}
.fc.welcome{text-align:left}
.app:has(.welcome) .stats{display:none}
.z{padding-left:0}
.z.ans{margin-top:auto;animation:in .25s ease-out}
.lab{font-size:13px;font-weight:700;letter-spacing:.04em;text-transform:uppercase;color:var(--c)}
.word{font:500 clamp(30px,7.5vw,46px)/1.15 Spectral,Georgia,serif;overflow-wrap:anywhere}
.oth{display:flex;flex-wrap:wrap;gap:4px 16px;margin-top:10px;font-size:14px;color:var(--mute)}
.dot{display:inline-block;width:8px;height:8px;border-radius:50%;background:var(--c);margin-right:7px}
.mark .dot{width:10px;height:10px;margin:0}
.hint{font-size:15px;color:var(--mute);margin:0}
.mt{margin-top:auto}
.bad{color:var(--ink);font-weight:700}
#err{margin:12px 0 0}
.empty{text-align:center;color:var(--mute);padding:28px 12px}
.panel{background:var(--sf);border:1px solid var(--ln);border-radius:22px;padding:22px;box-shadow:0 10px 35px rgba(27,57,42,.045)}
.grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}
@media(max-width:520px){.grid{grid-template-columns:1fr}}
.card-pair{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-bottom:14px}
.card-pair label{color:var(--mute)}
.more-languages{margin-top:12px;border-top:1px solid var(--ln);padding-top:10px}
.more-languages summary{color:var(--mute);font-size:15px;font-weight:600;cursor:pointer;padding:12px 0}
.more-languages .grid{margin-top:10px}
.more-section{margin-top:14px}
.more-section summary{cursor:pointer;font-weight:700;list-style:none;display:flex;justify-content:space-between;align-items:center;min-height:44px}
.more-section summary::-webkit-details-marker{display:none}
.more-section summary::after{content:'+';color:var(--mute);font-size:20px;line-height:1}
.more-section[open] summary::after{content:'−'}
.more-section>.panel{background:transparent;border:0;border-radius:0;padding:12px 0 0;margin-top:0!important}
.more-section>.panel:first-of-type>b:first-child{display:none}
.dupe{margin-top:12px;padding:12px;border:1px solid var(--de);border-radius:12px;background:var(--bg)}
.dupe p{margin:0 0 8px}
.dupe .row{margin-top:8px}
.dupe .btn{min-height:44px}
.connection,.update-banner{border-radius:12px;padding:10px 12px;margin:-7px 0 16px;font-size:13px;background:var(--sf);border:1px solid var(--ln);color:var(--ink)}
.update-banner{display:flex;align-items:center;justify-content:space-between;gap:10px}
.update-banner[hidden],.connection[hidden]{display:none}
.update-banner .btn{padding:7px 12px;flex:none}
label{display:block;font-size:13px;font-weight:600;color:var(--c);margin:0 0 4px 2px}
.item{display:flex;gap:10px;align-items:flex-start;background:var(--sf);border:1px solid var(--ln);border-radius:14px;padding:12px 14px;margin-top:10px}
.tx{flex:1;min-width:0}.tx div{overflow-wrap:anywhere}
.ib{display:block;border:0;background:none;color:var(--mute);font:inherit;font-size:14px;cursor:pointer;padding:8px 10px;min-height:44px}
.item .ib{min-width:72px}
.card-list-pair{margin:18px 2px 0;font-weight:600}
.ib:hover{color:var(--ink)}
.l-en{--c:var(--en)}.l-de{--c:var(--de)}.l-fr{--c:var(--fr)}.l-ru{--c:var(--ru)}
.chk{display:inline-flex;align-items:center;gap:6px;margin:0;font-weight:400;color:var(--mute)}.chk input{width:auto;padding:0}.say{display:inline;padding:0 4px;font-size:11px}.bars{display:flex;align-items:flex-end;gap:8px;margin:14px 0 6px}.bars div{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:flex-end;gap:2px}.bars i{width:100%;max-width:34px;background:var(--ink);border-radius:6px 6px 2px 2px}.bars small{font-size:11px;color:var(--mute)}@media(max-width:520px){.row .btn{padding:12px 6px}}textarea{font:inherit;font-size:13px;color:var(--ink);background:var(--bg);border:1px solid var(--ln);border-radius:10px;padding:10px 12px;width:100%;margin-top:10px;resize:vertical}
@keyframes in{from{opacity:0;transform:translateY(6px)}}
@media(prefers-reduced-motion:reduce){*{animation:none!important}}
.say{display:inline-flex;align-items:center;justify-content:center;min-width:44px;min-height:44px}
#theme{display:inline-flex;align-items:center;justify-content:center;min-width:44px;min-height:44px;font-size:18px}
.bars small{font-size:13px}
.answer-feedback{padding:10px 12px;border-radius:10px;background:var(--bg);text-align:left}
.answer-feedback.is-correct{border-left:4px solid var(--ru)}
.answer-feedback.is-incorrect{border-left:4px solid var(--fr)}
.session-result{font-size:16px;color:var(--ink)}
.search-count{margin:10px 2px 0}
mark{background:#ffe7a1;color:#14213d;border-radius:3px;padding:0 2px}
:root[data-theme="dark"] mark{background:#f2c14e;color:#14213d}
@media(prefers-color-scheme:dark){:root:not([data-theme="light"]) mark{background:#f2c14e;color:#14213d}}
.accent-row{display:flex;flex-wrap:wrap;gap:5px;margin-top:7px}
.accent-key{min-width:44px;min-height:44px;border:1px solid var(--ln);border-radius:10px;background:var(--bg);color:var(--ink);font:600 18px Onest,system-ui,sans-serif;cursor:pointer}
.accent-key:hover{border-color:var(--ink)}
.study-card.revealable{cursor:pointer;transition:border-color .2s ease,transform .2s ease,box-shadow .2s ease}
.study-card.revealable:hover{border-color:var(--accent);transform:translateY(-2px);box-shadow:0 24px 60px rgba(28,91,73,.16)}
.reveal-prompt{display:flex;align-items:center;justify-content:space-between;gap:18px;flex-wrap:wrap}
.reveal-button{color:var(--accent);border-color:color-mix(in srgb,var(--accent) 35%,var(--ln));background:color-mix(in srgb,var(--accent) 8%,var(--sf));white-space:nowrap}
.reveal-button span{margin-left:10px}
.study-activity{display:none}
.study-main>.row{margin-top:16px}
.study-main .grade-actions{margin-top:18px}
.study-shell .dir{max-width:700px}
.more-section summary::after{content:'⌄';font-size:21px;transform:rotate(0);transition:transform .2s ease}
.more-section[open] summary::after{content:'⌄';transform:rotate(180deg)}
.bars i{background:linear-gradient(180deg,var(--accent),color-mix(in srgb,var(--accent) 50%,var(--sf)))}
@media(min-width:850px){
 .study-shell{display:grid;grid-template-columns:minmax(245px,290px) minmax(0,1fr);column-gap:30px;align-items:start}
 .study-sidebar{grid-column:1}
 .study-main{grid-column:2;min-width:0}
 .study-sidebar>.dir{flex-wrap:wrap}
 .study-sidebar>.dir select{width:100%}
 .study-sidebar>.dir .sw{width:100%;min-height:42px;padding:4px}
 .study-sidebar>.stats{display:grid;grid-template-columns:1fr 1fr;gap:7px;margin:18px 0}
 .study-sidebar>.stats .pill{text-align:center;padding:9px 6px}
 .study-sidebar>.stats .chk,.study-sidebar>.stats select,.study-sidebar>.stats .ib{grid-column:1/-1}
 .study-main>.fc{min-height:390px}
 .study-activity{display:block;margin-top:22px}
 .study-activity .panel{padding:16px;border-radius:18px}
 .study-activity .bars{gap:4px}
 .study-activity .bars small{font-size:11px}
 #main:has(>.study-shell)>.study-shell{min-height:390px}
 #main:not(:has(>.study-shell)){max-width:840px;margin-inline:auto}
}
@media(max-width:600px){.fc{min-height:310px}.reveal-prompt{align-items:flex-start}.reveal-button{width:100%}.stats{gap:6px}.stats .pill{font-size:12px}}