@font-face{font-family:"Source Sans 3";src:url("fonts/SourceSans3-Upright.woff2") format("woff2");font-style:normal;font-weight:200 900;font-display:swap}
@font-face{font-family:"Source Sans 3";src:url("fonts/SourceSans3-Italic.woff2") format("woff2");font-style:italic;font-weight:200 900;font-display:swap}
:root{--bg:#f6f7f9;--card:#fff;--ink:#1b2430;--mute:#5b6675;--line:#e2e6ec;--accent:#1d4ed8;--action-ink:#fff;--ok:#15803d;--okbg:#e7f6ec;--bad:#b91c1c;--badbg:#fdeaea}
@media (prefers-color-scheme:dark){:root:not([data-mode="light"]){--bg:#10141a;--card:#181d25;--ink:#e8ecf2;--mute:#9aa5b5;--line:#2a323d;--accent:#8fb1ff;--action-ink:#10141a;--ok:#4ade80;--okbg:#12301f;--bad:#f87171;--badbg:#341616}}
:root[data-mode="dark"]{--bg:#10141a;--card:#181d25;--ink:#e8ecf2;--mute:#9aa5b5;--line:#2a323d;--accent:#8fb1ff;--action-ink:#10141a;--ok:#4ade80;--okbg:#12301f;--bad:#f87171;--badbg:#341616}
:root[data-theme="teal"]{--accent:#0f766e}
:root[data-theme="purple"]{--accent:#6d28d9}
:root[data-theme="rose"]{--accent:#be185d}
:root[data-theme="warm"]{--accent:#9a3412}
@media (prefers-color-scheme:dark){:root:not([data-mode="light"])[data-theme="teal"]{--accent:#5eead4}:root:not([data-mode="light"])[data-theme="purple"]{--accent:#c4b5fd}:root:not([data-mode="light"])[data-theme="rose"]{--accent:#f9a8d4}:root:not([data-mode="light"])[data-theme="warm"]{--accent:#fdba74}}
:root[data-mode="dark"][data-theme="teal"]{--accent:#5eead4}
:root[data-mode="dark"][data-theme="purple"]{--accent:#c4b5fd}
:root[data-mode="dark"][data-theme="rose"]{--accent:#f9a8d4}
:root[data-mode="dark"][data-theme="warm"]{--accent:#fdba74}
:root[data-theme="calm"]{--bg:#F0F4F8;--card:#EDEEF1;--ink:#2C3E50;--mute:#52646F;--line:#A4D7E1;--accent:#2C3E50;--action-ink:#F0F4F8}
@media (prefers-color-scheme:dark){:root:not([data-mode="light"])[data-theme="calm"]{--bg:#192836;--card:#2C3E50;--ink:#F0F4F8;--mute:#C2D3DB;--line:#7A9B9E;--accent:#A4D7E1;--action-ink:#192836}}
:root[data-mode="dark"][data-theme="calm"]{--bg:#192836;--card:#2C3E50;--ink:#F0F4F8;--mute:#C2D3DB;--line:#7A9B9E;--accent:#A4D7E1;--action-ink:#192836}
:root[data-theme="trusted"]{--bg:#F7FBFF;--card:#FFFFFF;--ink:#001F3F;--mute:#526579;--line:#AAAAAA;--accent:#0074D9;--action-ink:#FFFFFF}
@media (prefers-color-scheme:dark){:root:not([data-mode="light"])[data-theme="trusted"]{--bg:#00172F;--card:#102E4D;--ink:#FFFFFF;--mute:#CAD7E2;--line:#637F99;--accent:#7FDBFF;--action-ink:#001F3F}}
:root[data-mode="dark"][data-theme="trusted"]{--bg:#00172F;--card:#102E4D;--ink:#FFFFFF;--mute:#CAD7E2;--line:#637F99;--accent:#7FDBFF;--action-ink:#001F3F}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.5 "Source Sans 3",system-ui,-apple-system,Segoe UI,Roboto,sans-serif}
.top{display:flex;justify-content:space-between;align-items:center;padding:12px 16px;background:var(--card);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:10}
:root[data-theme="calm"] .top{border-bottom:3px solid #7A9B9E}
:root[data-theme="calm"] .catalog-card .pill{background:#A4D7E1;color:#2C3E50;border-radius:999px;padding:4px 8px}
:root[data-theme="trusted"] .top{background:#001F3F;border-bottom:3px solid #7FDBFF}
:root[data-theme="trusted"] .top #brand,:root[data-theme="trusted"] .top #nav a{color:#FFFFFF}
:root[data-theme="trusted"] .catalog-card .pill{background:#7FDBFF;color:#001F3F;border-radius:999px;padding:4px 8px}
#brand{color:var(--ink);text-decoration:none;font-weight:600}
#nav{display:flex;gap:12px;font-size:14px;white-space:nowrap}#brand{font-size:15px}
.activitybar{display:flex;align-items:center;gap:12px;flex-wrap:wrap;justify-content:center;font-size:12px;font-weight:600;color:var(--ink)}
.activitybar[hidden]{display:none}
.activitybar span{white-space:nowrap;background:var(--bg);border:1px solid var(--line);border-radius:999px;padding:4px 9px}
@media(max-width:760px){.activitybar{order:3;width:100%;gap:6px}.activitybar span{padding:3px 7px}#nav{margin-left:auto}}
#nav a,.link{color:var(--accent);cursor:pointer;background:none;border:0;font:inherit;padding:0;text-decoration:none}
main{max-width:720px;margin:0 auto;padding:16px}
h1{font-size:22px;margin:8px 0 4px}h2{font-size:18px;margin:0}
.mute{color:var(--mute)}.small{font-size:13px}
.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:16px;margin:12px 0}
input[type=text]{width:100%;padding:14px;font-size:18px;letter-spacing:1px;border:1px solid var(--line);border-radius:10px;background:var(--bg);color:var(--ink);text-transform:uppercase}
.feedback-form{display:flex;flex-direction:column;gap:8px}
.feedback-form label{font-weight:600;margin-top:6px}
.feedback-form input[type=text],.feedback-form textarea{font:inherit;letter-spacing:normal;text-transform:none;padding:12px;border:1px solid var(--line);border-radius:10px;background:var(--bg);color:var(--ink);resize:vertical}
.feedback-form .btn{margin-top:10px}
.practice-setup{display:flex;flex-direction:column;gap:9px;max-width:520px}
.practice-setup label{font-weight:700;margin-top:5px}
.practice-setup input,.practice-setup select{font:inherit;color:var(--ink);background:var(--bg);border:1px solid var(--line);border-radius:10px;padding:12px}
.practice-setup .btn{margin-top:8px}
.quiz-clock{font-variant-numeric:tabular-nums;background:#001F3F;color:#fff;padding:5px 9px;border-radius:7px;white-space:nowrap}
.btn{display:inline-block;width:100%;padding:14px;border:0;border-radius:10px;background:var(--accent);color:var(--action-ink);font-size:16px;font-weight:600;cursor:pointer;margin-top:12px}
.btn.alt{background:transparent;color:var(--accent);border:1px solid var(--line)}
.btn:disabled{opacity:.5}
.err{color:var(--bad);margin-top:10px}
.set{border-left:6px solid var(--c);padding:0}
.set>summary{list-style:none;cursor:pointer;padding:14px 16px;font-weight:600;display:flex;justify-content:space-between}
.set>summary::after{content:"+";color:var(--mute)}.set[open]>summary::after{content:"–"}
.topic{display:flex;justify-content:space-between;gap:8px;width:100%;text-align:left;background:none;border:0;border-top:1px solid var(--line);padding:12px 16px;font:inherit;color:var(--ink);cursor:pointer}
.topic:hover{background:var(--bg)}
.topiclist{padding:0;overflow:hidden}.topiclist .topic:first-child{border-top:0}
.topic:disabled{cursor:default;opacity:.55}.topic:disabled:hover{background:none}
.pill{white-space:nowrap;color:var(--mute);font-size:13px}
.diff{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.diff button{padding:16px;border-radius:10px;border:1px solid var(--line);background:var(--card);color:var(--ink);font:inherit;font-weight:600;cursor:pointer;text-align:left}
.diff button small{display:block;font-weight:400;color:var(--mute)}
.diff button:disabled{opacity:.4;cursor:not-allowed}
.preboard-actions{display:flex;flex-wrap:wrap;gap:10px;margin:16px 0;align-items:center}.preboard-actions .btn{width:auto;flex:1;min-width:130px;margin:0}.preboard-check{display:flex;gap:10px;align-items:flex-start}.preboard-check input{width:auto;margin:4px 0}.preboard-clock strong{display:block;font-size:32px;color:var(--accent);font-variant-numeric:tabular-nums}.preboard-clock p{margin:8px 0}.preboard-rules h3{margin:18px 0 8px}.preboard-average{font-size:36px;font-weight:700;color:var(--accent);margin:10px 0}.table-scroll{overflow-x:auto}.question-figure{max-width:100%;height:auto}.preboard-rules p{line-height:1.6}
.stem{font-size:18px;margin:6px 0 14px}
.choice{display:flex;gap:10px;width:100%;text-align:left;padding:12px 14px;margin:8px 0;border:1px solid var(--line);border-radius:10px;background:var(--card);color:var(--ink);font:inherit;cursor:pointer}
.choice b{min-width:20px}
.choice:not(:disabled):hover{border-color:var(--accent)}
.choice.selected{border-color:var(--accent);background:var(--okbg);box-shadow:0 0 0 2px var(--accent) inset}
.choice.right{background:var(--okbg);border-color:var(--ok)}
.choice.wrong{background:var(--badbg);border-color:var(--bad)}
.quiz-problem h2{font-size:18px;line-height:1.4;margin-bottom:14px}.quiz-page-nav{gap:10px}.quiz-page-nav .btn{width:50%}
.quiz-review-item h3{font-size:17px;line-height:1.4;margin:0 0 12px}.quiz-review-item p{margin:8px 0}
.review-correct{color:var(--ok)}.review-wrong{color:var(--bad)}.review-hint{padding:9px 11px;border-left:3px solid var(--accent);background:var(--bg);border-radius:0 7px 7px 0}
@media(max-width:420px){.quiz-page-nav{flex-direction:column}.quiz-page-nav .btn{width:100%}}
.fb{padding:12px 14px;border-radius:10px;margin-top:12px}
.fb.right{background:var(--okbg)}.fb.wrong{background:var(--badbg)}
.bar{height:8px;background:var(--line);border-radius:4px;overflow:hidden;margin-top:6px}.bar i{display:block;height:100%;background:var(--accent)}
table{width:100%;border-collapse:collapse;font-size:14px}td,th{padding:8px 4px;border-top:1px solid var(--line);text-align:left}
.accuracy-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin:14px 0}
.accuracy-card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:14px;display:flex;flex-direction:column;gap:4px}
.accuracy-card strong{font-size:26px;color:var(--accent);line-height:1.2}
.accuracy-card .bar{width:100%}
.accuracy-day{display:grid;grid-template-columns:88px 1fr 84px;gap:8px;align-items:center;font-size:13px;margin:10px 0}
.accuracy-day .bar{margin:0}
.accuracy-day>span:last-child{text-align:right}
@media(max-width:420px){.accuracy-day{grid-template-columns:75px 1fr 70px;gap:5px;font-size:11px}}
details.faq{margin:10px 0}details.faq summary{font-weight:600;cursor:pointer}
.row{display:flex;justify-content:space-between;align-items:center}
.mark{display:inline-grid;place-items:center;width:26px;height:26px;margin-right:8px;border-radius:7px;background:var(--accent);color:#fff;font-weight:800;font-size:17px;vertical-align:middle}
.mark.big{width:64px;height:64px;font-size:40px;border-radius:16px;margin:0}.hero{margin:18px 0 6px}
/* First screen (sign-in): everything centered */
.login{max-width:420px;margin:0 auto;text-align:center;padding-top:6vh}
.login .hero{display:flex;justify-content:center;margin:0 0 12px}
.login h1{font-size:26px;margin:0 0 6px}
.login #code{text-align:center}
.login .err:empty{display:none}
#brand{display:flex;align-items:center}
#brand b{margin-left:.3em}
.brand-logo{width:40px;height:40px;object-fit:contain;margin-right:8px;border-radius:6px;background:#fff}
.login-logo{width:180px;height:180px;object-fit:contain;border-radius:16px;background:#fff}
.top{flex-wrap:wrap;gap:6px 12px}#brand{white-space:nowrap}#nav{flex-wrap:wrap;justify-content:flex-end}
.trialbar{position:sticky;top:49px;z-index:9;background:#fef3c7;color:#7c4a03;text-align:center;padding:8px 10px;font-size:13px;font-weight:600}
@media (prefers-color-scheme:dark){.trialbar{background:#3a2e0a;color:#f3d27a}}
.trialbar a{color:inherit;text-decoration:underline}
.preboard-return{max-width:1080px;margin:16px auto;padding:16px}.preboard-return h2{margin-top:0}@media(max-width:1120px){.preboard-return{margin:16px}}

/* Family / exam / tab picker cards (Home > Family > Exam > Practice-Flashcards-Community) */
.familybtn,.exambtn,.tabbtn{display:flex;flex-direction:column;gap:4px;width:100%;text-align:left;background:var(--card);color:var(--ink);font:inherit;cursor:pointer;border:1px solid var(--line)}
.familybtn:hover,.exambtn:hover,.tabbtn:hover{border-color:var(--accent)}
.tabbtn:disabled{opacity:.78;cursor:not-allowed}
.familybtn b,.exambtn b,.tabbtn b{font-size:17px}
.card.locked{display:flex;justify-content:space-between;align-items:center;opacity:.6}
.card.locked .pill{background:var(--bg);padding:4px 10px;border-radius:999px}
.catalog-card{display:flex;flex-direction:row;align-items:center;gap:14px;min-height:88px}
.catalog-logo{width:64px;height:64px;object-fit:contain;flex:none}
.catalog-copy{display:flex;flex-direction:column;gap:3px;min-width:0;flex:1}
.catalog-card .pill{flex:none}
@media(max-width:480px){.catalog-card{gap:10px;min-height:76px}.catalog-logo{width:52px;height:52px}.catalog-card .pill{font-size:11px;padding:4px 7px}}

/* Community chat */
.modnotice{background:var(--badbg);border-color:var(--bad);color:var(--ink);font-size:13px;line-height:1.5}
.chansel{width:100%;padding:12px 14px;font-size:15px;border:1px solid var(--line);border-radius:10px;background:var(--card);color:var(--ink);margin:6px 0 12px}
.chatbox{padding:0;display:flex;flex-direction:column;overflow:hidden}
.chatlog{max-height:50vh;overflow-y:auto;padding:14px 16px;display:flex;flex-direction:column;gap:10px}
.msg{max-width:85%;align-self:flex-start}
.msg.mine{align-self:flex-end}
.msgmeta{display:flex;gap:8px;font-size:11px;color:var(--mute);margin-bottom:2px}
.msg.mine .msgmeta{justify-content:flex-end}
.msgbody{background:var(--bg);border-radius:12px;padding:8px 12px;font-size:14px;word-wrap:break-word;white-space:pre-wrap}
.msg.mine .msgbody{background:var(--accent);color:var(--action-ink)}
.theme-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin:12px 0 24px}
.theme-choice{display:flex;align-items:center;gap:10px;padding:14px;border:1px solid var(--line);border-radius:10px;background:var(--card);color:var(--ink);font:inherit;text-align:left;cursor:pointer}
.theme-choice.on{border:2px solid var(--accent);padding:13px}
.theme-swatch{width:22px;height:22px;border-radius:50%;background:var(--swatch);flex:none}
.mode-choice{display:flex;gap:8px;margin:12px 0}
.mode-choice button{flex:1;padding:12px 8px;border:1px solid var(--line);border-radius:10px;background:var(--card);color:var(--ink);font:inherit;cursor:pointer}
.mode-choice button.on{border:2px solid var(--accent);padding:11px 7px}
.chatform{display:flex;gap:8px;padding:12px 16px;border-top:1px solid var(--line)}
.chatform input{flex:1;padding:10px 12px;font-size:15px;border:1px solid var(--line);border-radius:10px;background:var(--bg);color:var(--ink);text-transform:none;letter-spacing:normal}
.chatform .btn{width:auto;margin-top:0;padding:10px 18px}
.chatbox .err{padding:0 16px 10px}

/* Chess */
.chesswrap{max-width:520px;margin:0 auto}
.chessbar{display:flex;justify-content:space-between;align-items:center;gap:8px;font-size:14px;min-height:30px;padding:2px 0}
.chessbar .who{font-weight:600}
.chessclock{min-width:57px;text-align:right;font-variant-numeric:tabular-nums;font-weight:700;background:var(--card);border:1px solid var(--line);border-radius:6px;padding:2px 5px}
.chessclock.active{background:#001F3F;color:#fff;border-color:#001F3F;box-shadow:0 2px 8px rgba(0,31,63,.22)}
.caps{display:flex;align-items:center;flex-wrap:wrap;justify-content:flex-end;min-height:20px}
.caps .cap{width:20px;height:20px;margin-left:-6px}
.caps .cap:first-child{margin-left:0}
.caps b{margin-left:6px;font-size:12px;color:var(--mute)}
.board{position:relative;display:grid;grid-template-columns:repeat(8,1fr);width:100%;aspect-ratio:1;border-radius:6px;overflow:hidden;margin:4px 0;box-shadow:0 3px 16px rgba(0,0,0,.22);touch-action:none;user-select:none;-webkit-user-select:none}
.sq{position:relative;border:0;padding:0;margin:0;cursor:pointer;display:block;min-width:0;-webkit-tap-highlight-color:transparent}
.sq.light{background:#eeeed2}.sq.dark{background:#769656}
.sq.last::before,.sq.sel::before{content:"";position:absolute;inset:0;pointer-events:none}
.sq.last::before{background:rgba(255,255,51,.42)}
.sq.sel::before{background:rgba(20,85,30,.5)}
.sq.dragtarget::before{content:"";position:absolute;inset:0;background:rgba(255,255,255,.27);box-shadow:inset 0 0 0 4px rgba(255,255,255,.8);z-index:4;pointer-events:none}
.sq.dragorigin .pc{opacity:.18}
.sq:focus-visible{outline:3px solid var(--accent);outline-offset:-3px;z-index:4}
.board.locked .sq{cursor:default}
.pc{position:absolute;inset:0;width:100%;height:100%;z-index:2;pointer-events:none;will-change:transform}
.chessdrag{position:fixed;z-index:1000;pointer-events:none;filter:drop-shadow(0 6px 5px rgba(0,0,0,.38));transform:scale(1.08)}
.pc.glyph{display:flex;align-items:center;justify-content:center;font-size:min(9vw,44px);line-height:1;color:#111}
.chk{position:absolute;inset:0;z-index:1;background:radial-gradient(circle,rgba(255,0,0,.95) 0%,rgba(231,0,0,.55) 38%,rgba(169,0,0,0) 72%);pointer-events:none}
.dot{position:absolute;left:36%;top:36%;width:28%;height:28%;border-radius:50%;background:rgba(0,0,0,.2);z-index:3;pointer-events:none}
.ring{position:absolute;inset:0;border-radius:50%;background:radial-gradient(transparent 60%,rgba(0,0,0,.22) 62%);z-index:3;pointer-events:none}
.crd{position:absolute;font-size:clamp(8px,2.2vw,11px);font-weight:700;line-height:1;z-index:1;pointer-events:none}
.crd.rk{top:3px;left:3px}.crd.fl{bottom:3px;right:4px}
.sq.light .crd{color:#769656}.sq.dark .crd{color:#eeeed2}
.promo{position:absolute;inset:0;z-index:6;background:rgba(0,0,0,.5);display:flex;align-items:center;justify-content:center}
.promo .opts{display:flex;gap:8px;background:var(--card);padding:10px;border-radius:12px;box-shadow:0 6px 24px rgba(0,0,0,.35)}
.promo button{position:relative;width:min(16vw,68px);height:min(16vw,68px);border:1px solid var(--line);border-radius:10px;background:#eeeed2;padding:0;cursor:pointer}
.promo button:hover{border-color:var(--accent)}
.cstatus{text-align:center;font-weight:600;margin:10px 0 4px;min-height:24px}
.cstatus.warn{color:var(--bad)}
.gameover{text-align:center}.gameover h2{margin-bottom:2px}.gameover .btn+.btn{margin-top:8px}
.chessctl{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:10px}
.chessctl .btn{margin-top:0;padding:11px 4px;font-size:14px}
.btn.danger{color:#fff;background:var(--bad);border-color:var(--bad)}
.credit{text-align:center;margin-top:14px;font-size:11px}
.chesssetup .seg{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin:6px 0 16px}
.seg button{display:flex;align-items:center;justify-content:center;gap:6px;padding:12px 6px;border:1px solid var(--line);border-radius:10px;background:var(--card);color:var(--ink);font:inherit;font-weight:600;cursor:pointer}
.seg button.on{border-color:var(--accent);box-shadow:inset 0 0 0 1px var(--accent);color:var(--accent)}
.segpc{width:24px;height:24px;flex:none}
.segpc.glyph{font-size:20px;line-height:1}
.trivia .stem{font-size:15px}
.trivia .choice{padding:9px 12px;margin:5px 0;font-size:14px}

/* Memory Match */
.gamelevel{gap:12px;margin:10px 0;flex-wrap:wrap}
.gamelevel select{border:1px solid var(--line);border-radius:7px;background:var(--card);color:var(--ink);font:inherit;font-weight:600;padding:5px}
.moves-left{color:var(--accent);white-space:nowrap}
.memgrid{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin:10px 0}
.memtile{aspect-ratio:1;border:1px solid var(--line);border-radius:10px;background:var(--card);color:var(--ink);cursor:pointer;display:flex;align-items:center;justify-content:center;padding:6px}
.memtile .memface{font-size:11px;line-height:1.25;text-align:center;overflow:hidden}
.memtile:not(.flip) .memface{font-size:20px;color:var(--mute)}
.memtile.flip{background:var(--bg);border-color:var(--accent)}
.memtile.matched{background:var(--okbg);border-color:var(--ok);opacity:.7;cursor:default}

/* Word Search */
.wsgrid{display:grid;grid-template-columns:repeat(var(--n),1fr);gap:2px;margin:10px 0;background:var(--line);border:1px solid var(--line);border-radius:8px;overflow:hidden}
.wsq{aspect-ratio:1;border:0;background:var(--card);color:var(--ink);font-size:min(3.6vw,15px);font-weight:600;cursor:pointer;padding:0}
.wsq.sel{background:var(--accent);color:var(--action-ink)}
.wsq.found{background:var(--okbg);color:var(--ok)}
.wsclue{font-size:13px;padding:4px 0;border-top:1px solid var(--line)}
.wsclue:first-child{border-top:0}
.wsclue.found{color:var(--ok)}

/* Install-to-home-screen modal */
.modalbg{position:fixed;inset:0;background:rgba(0,0,0,.5);display:flex;align-items:center;justify-content:center;z-index:100;padding:16px}
.modal{max-width:360px;width:100%;margin:0}
.modal p{line-height:1.6}

/* Flashcards */
.flashcard{width:100%;min-height:220px;display:flex;flex-direction:column;justify-content:center;gap:10px;text-align:center;cursor:pointer;border:1px solid var(--line);background:var(--card)}
.flashcard.flipped{background:var(--okbg);border-color:var(--ok)}
.flashcard .pill{align-self:center;background:var(--bg);padding:4px 10px;border-radius:999px}
.flashcard .stem{font-size:20px;font-weight:600;margin:8px 0}
.review-watermark{position:fixed;inset:0;z-index:8;display:grid;grid-template-columns:repeat(4,1fr);grid-template-rows:repeat(5,1fr);align-items:center;justify-items:center;overflow:hidden;pointer-events:none;user-select:none;color:var(--ink);opacity:.075}
.review-watermark span{display:block;white-space:nowrap;font-size:clamp(11px,1.1vw,15px);font-weight:700;letter-spacing:.18em;transform:rotate(-25deg)}
.chess-tabs{display:flex;gap:6px;margin:1rem 0;flex-wrap:wrap}.chess-tabs button{flex:1;min-width:125px}
.chess-list-item{display:flex;align-items:center;justify-content:space-between;gap:1rem;margin:.6rem 0}.chess-list-item .btn{width:auto;margin:0;white-space:nowrap}
.chess-chat-log{min-height:4rem;max-height:13rem;overflow:auto}
.thread-notify{gap:12px;flex-wrap:wrap;margin:10px 0}.thread-notify label{display:flex;align-items:center;gap:7px;font-weight:600}.thread-notify input{accent-color:var(--accent)}
.rating-modal{max-width:460px}.rating-modal fieldset{border:0;margin:0 0 12px;padding:0}.rating-modal legend{font-weight:700;margin-bottom:7px}.rating-stars{display:flex;flex-wrap:wrap;gap:6px}.rating-stars label{cursor:pointer}.rating-stars input{position:absolute;opacity:0}.rating-stars span{display:block;padding:7px 9px;border:1px solid var(--line);border-radius:8px}.rating-stars input:checked+span,.rating-stars input:focus-visible+span{background:var(--accent);color:var(--action-ink);border-color:var(--accent)}.rating-modal textarea{width:100%;font:inherit;color:var(--ink);background:var(--bg);border:1px solid var(--line);border-radius:9px;padding:10px;resize:vertical}.rating-actions{display:grid;grid-template-columns:1fr 1fr;gap:9px}
button,.btn,.card,.choice,.topic{transition:background-color .16s ease,border-color .16s ease,box-shadow .16s ease,transform .16s ease}
button:not(:disabled):active,.btn:not(:disabled):active{transform:scale(.985)}
.familybtn:not(:disabled):hover,.exambtn:not(:disabled):hover{transform:translateY(-2px);box-shadow:0 7px 18px rgba(0,31,63,.1)}
.btn:not(:disabled):hover{filter:brightness(1.06)}
:focus-visible{outline:3px solid var(--accent);outline-offset:2px}
@media(prefers-reduced-motion:reduce){button,.btn,.card,.choice,.topic{transition:none}.familybtn:not(:disabled):hover,.exambtn:not(:disabled):hover{transform:none}}
.attachment-row{display:flex;align-items:center;justify-content:space-between;gap:12px;border-top:1px solid var(--line);padding:9px 0;overflow-wrap:anywhere}.attachment-row>div:last-child{display:flex;gap:12px;flex:none}
.mod-actions{display:flex;flex-wrap:wrap;gap:8px}.mod-actions .btn{width:auto;margin:8px 0 0}

/* Readable mobile controls and clear action feedback. */
html{-webkit-text-size-adjust:100%;text-size-adjust:100%}
body{font-size:17px}
button,input,select,textarea{font-family:inherit}
.small,small,.pill{font-size:15px;line-height:1.5}
#nav{font-size:15px;gap:4px 8px}
#nav a{display:inline-flex;align-items:center;min-height:44px;padding:6px 8px}
.activitybar{font-size:14px;gap:6px}
.activitybar .account-sync{font-weight:400;border:0;background:none;white-space:normal}
.account-sync.error,.account-sync.pending{color:var(--mute)}
:root[data-theme="trusted"] .activitybar .account-sync{color:#FFFFFF}
:root[data-theme="trusted"] .activitybar .account-sync.error{color:#FFD580}
.btn,.link,button,summary{touch-action:manipulation}
.btn,button.link,a.link{min-height:48px}
a.link,button.link{display:inline-flex;align-items:center;padding:10px 12px;border-radius:9px}
a.link.small{font-size:16px;font-weight:600;background:var(--card);border:1px solid var(--line);margin:0 0 8px}
button:not(:disabled),a[href],summary{cursor:pointer;-webkit-tap-highlight-color:rgba(0,116,217,.2)}
.tap-feedback{box-shadow:0 0 0 3px color-mix(in srgb,var(--accent) 35%,transparent)!important;filter:brightness(.92)}
button:not(:disabled):active,a[href]:active{filter:brightness(.9)}
.btn[disabled],button[disabled]{cursor:not-allowed}
button[aria-busy="true"]{cursor:wait}
.choice{min-height:52px;font-size:17px;align-items:flex-start}
.choice.selected{background:color-mix(in srgb,var(--accent) 12%,var(--card));border-width:2px;padding:11px 13px}
.preboard-check{align-items:center;min-height:56px;padding:10px;border:1px solid var(--line);border-radius:10px;cursor:pointer;font-size:17px}
.preboard-check input{appearance:auto;width:28px;height:28px;min-width:28px;margin:0;accent-color:var(--accent);cursor:pointer}
.save-status,.offline-readiness{padding:10px 12px;border-radius:9px;background:var(--bg);font-size:15px;line-height:1.5}
.offline-readiness.ready{color:var(--ok);background:var(--okbg);font-weight:600}
.dashboard-next h2{font-size:20px}.dashboard-next p{margin:10px 0}
.countdown-units{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px;margin:16px 0}
.countdown-units span{display:flex;flex-direction:column;text-align:center;padding:12px 4px;border-radius:10px;background:var(--bg);font-size:15px}
.countdown-units b{font-size:28px;font-variant-numeric:tabular-nums}
.schedule-pending{font-size:15px}
.login{max-width:520px;min-height:calc(100svh - 120px);display:flex;flex-direction:column;align-items:center;justify-content:center;padding:24px 0 44px}
.login .hero{width:100%;margin:0 0 18px}
.login-logo{width:min(100%,440px);height:auto;max-height:240px;border-radius:0;background:transparent}
.login>p{max-width:440px;margin:8px 0 16px;font-size:18px}
.login form{width:min(100%,420px);margin:0 auto}
.brand-logo{width:40px;height:40px;border-radius:0;background:transparent;object-fit:contain}
:root[data-theme="trusted"] .brand-logo{filter:brightness(0) invert(1)}
:root[data-mode="dark"] .login-logo,:root[data-mode="dark"] .brand-logo{filter:brightness(0) invert(1)}
@media(prefers-color-scheme:dark){:root[data-mode="system"] .login-logo,:root[data-mode="system"] .brand-logo{filter:brightness(0) invert(1)}}
.review-watermark{inset:100px 0 24px;display:flex;align-items:center;justify-content:space-between;padding:0 2px;opacity:.035;z-index:1}
.review-watermark span{writing-mode:vertical-rl;transform:none;font-size:11px;letter-spacing:.16em}
.review-watermark span:first-child{transform:rotate(180deg)}
.memgrid{grid-template-columns:repeat(4,minmax(0,1fr));grid-auto-rows:160px;gap:10px;align-items:stretch}
.memtile{height:160px;width:100%;aspect-ratio:auto;min-width:0;min-height:0;overflow:hidden;padding:10px}
.memtile .memface{font-size:15px;line-height:1.35;width:100%;max-height:100%;overflow:auto;overflow-wrap:anywhere}
.memtile:not(.flip) .memface{font-size:30px}
body[data-screen="memory"] main{max-width:1000px}
.msgbody,.wsclue,.trivia .stem,.trivia .choice{font-size:16px}
.msgmeta{font-size:14px}
@media(max-width:600px){
  main{padding:16px 18px}
  #brand{font-size:16px}#brand b{margin-left:.25em}
  .top{padding:8px 12px;gap:4px 8px}
  #nav{width:100%;justify-content:center;margin-left:0}
  .activitybar{width:100%;justify-content:center}
  .activitybar span{white-space:normal}
  .memgrid{grid-template-columns:repeat(2,minmax(0,1fr));grid-auto-rows:168px}
  .memtile{height:168px}.memtile .memface{font-size:16px}
  body[data-screen="memory"] .activitybar{display:none}
  .row{flex-wrap:wrap;gap:8px}
  .quiz-page-nav{flex-wrap:nowrap;flex-direction:row}
  .quiz-page-nav .btn{width:auto;flex:1}
  .preboard-actions{gap:8px}.preboard-actions .btn{min-width:110px}
  .login{min-height:calc(100svh - 160px);padding:20px 0}
  .login-logo{width:100%;max-height:190px}
  .catalog-card .pill,.accuracy-day,.wsclue{font-size:14px}
  .wsq{font-size:16px}
  .review-watermark{padding:0 1px}
  .review-watermark span{font-size:10px}
}
@media(prefers-reduced-motion:reduce){.tap-feedback{filter:none}button:not(:disabled):active,a[href]:active{transform:none}}
.retention-notice{max-width:960px;margin:12px auto 0;padding:12px 18px;font-size:14px;line-height:1.5;color:var(--mute);overflow-wrap:anywhere}
.retention-notice.warning{color:var(--fg);border:2px solid #b45309;border-radius:12px}
.retention-policy{max-width:420px;margin:16px auto 0;line-height:1.5}
.subscription-reminder{max-width:920px;margin:12px auto;border:2px solid #b45309}

/* Keep all account navigation links on a single accessible row. */
#brand{flex-shrink:0}
#nav{order:2;flex:1;min-width:0;width:auto;flex-wrap:nowrap;justify-content:flex-start;overflow-x:auto;overscroll-behavior-x:contain;white-space:nowrap}
#nav a{flex:0 0 auto;white-space:nowrap}
.top .activitybar{order:3;flex-basis:100%;width:100%}
.login-prompt{width:100%;max-width:520px;overflow-x:auto;margin:8px 0 16px}
.login-prompt p{width:max-content;min-width:100%;margin:0;font-size:16px;white-space:nowrap;text-align:center}
.login-details{width:min(100%,420px);margin:18px auto 0;padding-left:22px;text-align:left;line-height:1.6}
.login-details li+li{margin-top:8px}
.abbreviation-topic{color:var(--ink);text-decoration:none;align-items:center}
.abbreviation-topic span:first-child{min-width:0;overflow-wrap:anywhere}
.abbreviation-topic .pill{flex-shrink:0}
.abbreviation-card h2{font-size:22px;margin-bottom:16px}
.abbreviation-controls{display:flex;gap:12px;flex-wrap:nowrap}
.abbreviation-controls .btn{flex:1;width:auto}
.abbreviation-card .choice:disabled{opacity:1;cursor:default}
.abbreviation-card .choice.correct{border:2px solid var(--ok);background:var(--okbg)}
.abbreviation-card .choice.wrong{border:2px solid var(--bad);background:var(--badbg)}
@media(max-width:850px){#nav{flex-basis:100%;width:100%;margin-left:0}}