@import url("https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:wght@400;500;600;700&display=swap");
@import url("https://fonts.googleapis.com/css2?family=Inter:wght@500;600;700;800;900&display=swap");


*{box-sizing:border-box}
:root{
  --red:#e73332;
  --green:#00884a;
  --black:#111111;
  --blue:#5594c7;
  --paper:#ffffff;
  --off:#f5f5f2;
  --ink:#151515;
  --muted:#707070;
  --line:#deded9;
  --good:#08764a;
  --bad:#b73c40;
}
html,body{margin:0;min-height:100%;background:var(--off);color:var(--ink)}
body{
  font-family:"Helvetica Neue","Avenir Next",Avenir,Helvetica,Arial,sans-serif;
  -webkit-font-smoothing:antialiased;
}
button{font:inherit}
button:not(:disabled){cursor:pointer}
button:focus-visible{outline:3px solid rgba(85,148,199,.35);outline-offset:3px}
.hidden{display:none!important}

/* ---------- header ---------- */
.top-stripe{height:5px;display:grid;grid-template-columns:repeat(4,1fr)}
.top-stripe span:nth-child(1){background:var(--red)}
.top-stripe span:nth-child(2){background:var(--green)}
.top-stripe span:nth-child(3){background:var(--black)}
.top-stripe span:nth-child(4){background:var(--blue)}
header{height:76px;background:white;border-bottom:1px solid var(--line)}
.header-inner{
  width:min(1050px,calc(100% - 30px));height:100%;margin:auto;
  display:flex;align-items:center;justify-content:space-between;gap:20px
}
.brand{display:flex;align-items:center;gap:12px;color:inherit;text-decoration:none;min-width:0}
.brand-logo{
  width:64px;height:64px;object-fit:contain;display:block;background:white
}
.brand-copy strong{display:block;font-size:17px;letter-spacing:-.02em}
.brand-copy span{
  display:block;margin-top:3px;color:var(--muted);font-size:9px;
  text-transform:uppercase;letter-spacing:.14em;font-weight:700
}
.nav{display:flex;align-items:center;gap:22px}
.nav button{
  border:0;background:none;padding:8px 0;color:#7a7a78;font-size:16px;font-weight:700;
  border-bottom:2px solid transparent
}
.nav button.active{color:var(--ink);border-bottom-color:var(--ink)}
.theme-toggle{border:1px solid var(--line);background:#fff;color:#53617d;border-radius:9px;padding:8px 11px;font-size:11px;font-weight:800;white-space:nowrap}
.theme-toggle:hover{border-color:#9bb8f6;background:#edf3ff;color:#225dcc}



/* ---------- page/body only: visual language from the supplied reference ---------- */

main, footer{
  font-family:Inter,ui-sans-serif,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  letter-spacing:-.012em;
}
main{
  --ink:#0d1833;
  --muted:#65708c;
  --navy:#08142f;
  --navy2:#0d214b;
  --blue:#2166ff;
  --blue2:#3a7cff;
  --cyan:#54c7e8;
  --ice:#eef6ff;
  --paper:#fff;
  --line:#dce6f4;
  --soft:#f5f8fc;
  --green:#18a96b;
  --green-bg:#e8f8f0;
  --red:#dc5c67;
  --red-bg:#fff0f1;
  --gold:#e2ad45;
  --gold-bg:#fff7df;
  --shadow:0 20px 60px rgba(16,37,81,.12);
  --shadow-sm:0 10px 30px rgba(16,37,81,.08);
  color:var(--ink);
  min-height:calc(100vh - 81px);
  background:
    radial-gradient(circle at 12% 0%,rgba(33,102,255,.09),transparent 26rem),
    linear-gradient(180deg,#f9fbff 0,#eef3f9 100%);
}
.view{display:none}
.view.active{display:block}
.wrap{width:min(1050px,calc(100% - 30px));margin:auto;padding:38px 0 52px}
.page{width:min(1100px,calc(100% - 40px));margin:0 auto;padding:34px 0 60px}

/* Play keeps the structure/character the user already preferred. */
.start-grid{
  min-height:510px;display:grid;grid-template-columns:.9fr 1.1fr;gap:54px;align-items:center
}
.kicker{
  display:inline-block;color:#2560d6;font-size:16px;font-weight:900;
  letter-spacing:.15em;text-transform:uppercase
}
.start-copy h1{
  margin:10px 0 12px;font-size:44px;line-height:.98;letter-spacing:-.055em;font-weight:900
}
.start-copy h1 span{display:block;color:#4b8dca}
.start-copy p{max-width:430px;margin:0;color:#697592;font-size:18px;line-height:1.65}
.start-meta{margin-top:18px;color:#8793a8;font-size:13px;font-weight:800;text-transform:uppercase;letter-spacing:.08em}
.start-actions{display:grid;gap:10px}
.start-btn{
  position:relative;min-height:112px;border:0;border-radius:0;padding:20px 22px;text-align:left;color:white;
  display:grid;grid-template-columns:1fr auto;align-items:center;overflow:hidden;transition:transform .12s ease
}
.start-btn:hover{transform:translateX(3px)}
.start-btn.red{background:#ef3b39}
.start-btn.green{background:#078a50}
.start-btn.blue{background:#4b8dca}
.start-btn.black{background:#111214}
.start-btn strong{display:block;font-size:25px;letter-spacing:-.035em}
.start-btn small{display:block;margin-top:6px;color:rgba(255,255,255,.8);font-size:10px;line-height:1.4}
.start-btn .best-score-line{margin-top:4px;color:rgba(255,255,255,.96);font-size:12px;font-weight:800;letter-spacing:.01em}
.start-btn .best-score-line span{font-variant-numeric:tabular-nums}
.start-btn b{font-size:28px;font-weight:400}
.start-footer{
  border-top:1px solid #dce6f4;padding-top:15px;display:flex;align-items:center;justify-content:space-between;
  gap:15px;color:#7c879b;font-size:10px
}
.start-footer strong{color:#32425f}

/* Shared page headers */
.page-head{margin-bottom:24px}
.page-head h1{
  margin:6px 0 0;font-size:clamp(30px,4vw,44px);letter-spacing:-.045em;font-weight:900
}
.page-head p{margin:7px 0 0;color:var(--muted);font-size:14px;line-height:1.55}
.eyebrow{color:#2560d6;font-size:10px;font-weight:900;letter-spacing:.15em;text-transform:uppercase}

/* Practice cards: directly based on the preferred prototype */
.topic-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.topic-card{
  min-height:205px;border:1px solid var(--line);border-radius:18px;padding:19px;background:white;
  box-shadow:0 10px 25px rgba(20,40,80,.05);text-align:left;color:var(--ink);
  display:flex;flex-direction:column;transition:transform .14s,border-color .14s,box-shadow .14s
}
.topic-card:hover{
  border-color:#a6bff4;transform:translateY(-2px);box-shadow:0 15px 34px rgba(20,40,80,.08)
}
.topic-num{color:#9aa8c0;font-size:10px;font-weight:900}
.topic-card h3{margin:20px 0 7px;font-size:18px}
.topic-card p{margin:0;color:var(--muted);font-size:12px;line-height:1.5}
.topic-progress{height:5px;margin-top:auto;border-radius:99px;background:#edf1f7;overflow:hidden}
.topic-progress span{display:block;height:100%;border-radius:inherit;background:linear-gradient(90deg,#2366ff,#54c7e8)}
.topic-action{display:block;margin-top:12px;color:#255ecc;font-size:11px}
.topic-best{display:block;margin-top:6px;color:#8491a7;font-size:10px;font-weight:700}
.topic-best strong{color:#53617d;font-size:11px;font-variant-numeric:tabular-nums}
.rule-banner{
  margin-top:18px;border-radius:20px;padding:24px 26px;
  display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:18px;
  color:white;background:linear-gradient(135deg,#091b3e,#15356b)
}
.rule-banner-icon{
  width:46px;height:46px;border-radius:14px;display:grid;place-items:center;
  background:rgba(255,255,255,.1)
}
.rule-banner-icon svg{
  width:24px;height:24px;fill:none;stroke:currentColor;stroke-width:1.9;
  stroke-linecap:round;stroke-linejoin:round
}
.rule-banner h3{margin:0 0 5px;font-size:17px}
.rule-banner p{margin:0;color:#afbfda;font-size:12px;line-height:1.5}
.learn-link{
  min-height:44px;border:1px solid rgba(255,255,255,.14);border-radius:12px;padding:0 16px;
  color:#dce7f7;background:rgba(255,255,255,.08);font-size:11px;font-weight:850
}

/* Learn page: same 240px nav + large content card */
.learn-layout{display:grid;grid-template-columns:240px 1fr;gap:22px}
.learn-nav{display:grid;align-content:start;gap:8px}
.learn-nav button{
  min-height:48px;border:1px solid var(--line);border-radius:12px;padding:0 13px;
  color:#52617e;background:white;text-align:left;font-size:12px;font-weight:800
}
.learn-nav button:hover,.learn-nav button.active{
  color:#225dcc;border-color:#9bb8f6;background:#edf3ff
}
.learn-card{
  border:1px solid var(--line);border-radius:23px;padding:27px;background:white;box-shadow:var(--shadow-sm)
}
.learn-card h2{margin:5px 0 9px;font-size:32px}
.learn-card>.intro{margin:0 0 20px;color:var(--muted);font-size:14px;line-height:1.6}
.rule-list{display:grid;gap:11px}
.rule-item{
  border-radius:14px;padding:16px 17px;background:#f6f9fd;border:1px solid #e5ebf4
}
.rule-item h3{margin:0 0 5px;font-size:14px}
.rule-item p{margin:0;color:#5d6a84;font-size:12px;line-height:1.5}
.rule-item.callout{background:#eef5ff;border-color:#cadcfa}
.rule-item.warning{background:#fff8e5;border-color:#f0ddb0}
.source-note{
  margin-top:18px;padding-top:17px;border-top:1px solid var(--line);
  color:#8793a8;font-size:10px;line-height:1.55
}
.rule-practice{
  margin-top:20px;min-height:48px;border:0;border-radius:13px;padding:0 20px;
  color:white;background:linear-gradient(135deg,#2368ff,#377ef7);
  box-shadow:0 12px 26px rgba(33,102,255,.22);font-size:11px;font-weight:850
}

/* Game page: same proportions/visual language as the reference, neutral answers retained. */
.game-shell{width:min(840px,100%);margin:0 auto}
.game-toolbar{
  display:grid;grid-template-columns:auto 1fr auto;gap:14px;align-items:center;margin-bottom:14px
}
.back-btn{
  width:44px;height:44px;border-radius:12px;border:1px solid #b9cae6;
  background:#ffffff;color:#173d7a;display:grid;place-items:center;font-size:22px;font-weight:900;
  box-shadow:0 5px 14px rgba(33,77,145,.10);transition:transform .14s,border-color .14s,background .14s
}
.back-btn:hover{background:#edf4ff;border-color:#7da5e8;transform:translateX(-2px)}
.game-title strong{display:block;font-size:16px}
.game-title span{display:block;margin-top:3px;color:var(--muted);font-size:11px}
.score-cluster{display:flex;gap:8px}
.score-pill{
  min-width:76px;padding:8px 11px;border-radius:12px;background:white;border:1px solid var(--line);text-align:center
}
.score-pill span{display:block;color:#8190aa;font-size:8px;font-weight:900;letter-spacing:.08em;text-transform:uppercase}
.score-pill strong{display:block;margin-top:2px;font-size:16px;font-variant-numeric:tabular-nums}
.progress-row{display:grid;grid-template-columns:1fr;gap:13px;align-items:center;margin-bottom:15px}
.progress-track{height:9px;border-radius:99px;overflow:hidden;background:#dfe8f4}
.progress-track span{
  display:block;height:100%;width:100%;border-radius:inherit;
  background:linear-gradient(90deg,#2467ff,#55c7e8);transition:width .3s
}
.question{
  border:1px solid var(--line);border-radius:24px;padding:25px;background:white;box-shadow:var(--shadow)
}
.question-meta{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-bottom:18px}
.meta-pill{
  padding:6px 10px;border-radius:99px;background:#eef3f9;color:#53617d;
  font-size:9px;font-weight:900;letter-spacing:.06em;text-transform:uppercase
}
.meta-pill.blue{color:#225dcb;background:#eaf1ff}
.question h2{margin:0 0 22px;font-size:clamp(21px,3vw,29px);line-height:1.33;letter-spacing:-.025em}
.answers{display:grid;gap:10px}
.answer{
  min-height:58px;border:1px solid #ccd9ea;border-radius:13px;padding:10px 14px;
  display:grid;grid-template-columns:36px 1fr;align-items:center;gap:10px;
  color:#1d2b49;background:#f9fbfe;text-align:left;font-weight:700;transition:.14s ease
}
.answer:hover:not(:disabled){border-color:#7ba5ff;background:#f2f6ff;transform:translateY(-1px)}
.answer-key{
  width:30px;height:30px;border-radius:8px;display:grid;place-items:center;
  border:1px solid #dce5f1;background:white;font-size:11px;font-weight:900
}
.answer.correct{color:#0f6d42;border-color:#73d2a3;background:var(--green-bg)}
.answer.correct .answer-key{color:white;border-color:transparent;background:var(--green)}
.answer.wrong{color:#963d47;border-color:#ef9da5;background:var(--red-bg)}
.answer.wrong .answer-key{color:white;border-color:transparent;background:var(--red)}
/* Competitive Rush responds on the same click, without a 140ms color fade.
   Blue means submitted/checking, not an unverified correct/wrong verdict. */
.answers.secure-rush-answers .answer{transition:none}
.answers.secure-rush-answers .answer.pending{
  color:#194d9a;border-color:#407de4;background:#e7f0ff;
  box-shadow:inset 0 0 0 1px #407de4
}
.answers.secure-rush-answers .answer.pending .answer-key{
  color:white;border-color:#407de4;background:#407de4
}
.answer.dim{opacity:.36}
.feedback{
  display:none;margin-top:17px;border-radius:14px;padding:16px 17px;
  grid-template-columns:auto 1fr auto;gap:12px;align-items:start
}
.feedback.show{display:grid}
.feedback.good{color:#126b43;background:var(--green-bg);border:1px solid #b4e6cb}
.feedback.bad{color:#8d3942;background:var(--red-bg);border:1px solid #f0bcc1}
.feedback-badge{
  width:29px;height:29px;border-radius:50%;display:grid;place-items:center;
  color:white;background:var(--green);font-size:12px;font-weight:900
}
.feedback.bad .feedback-badge{background:var(--red)}
.feedback strong{font-size:14px}
.feedback p{margin:4px 0 0;color:#546476;font-size:12px;line-height:1.55}
.feedback-points{font-size:13px;font-weight:900;white-space:nowrap}
.game-bottom{margin-top:16px;display:flex;align-items:center;justify-content:space-between;gap:14px}
.keyboard-hint{color:#8290aa;font-size:10px}
.keyboard-hint kbd{
  padding:3px 6px;border:1px solid #d9e2ef;border-bottom-width:2px;border-radius:5px;background:white
}
.next-btn{
  min-width:142px;min-height:44px;border:0;border-radius:12px;padding:0 17px;
  color:white;background:linear-gradient(135deg,#2368ff,#377ef7);
  box-shadow:0 10px 24px rgba(33,102,255,.25);font-size:11px;font-weight:900;
  transition:transform .14s,box-shadow .14s
}
.next-btn:hover{transform:translateX(2px);box-shadow:0 13px 29px rgba(33,102,255,.32)}

/* Results page from same design language */
.results-hero{
  border-radius:26px;padding:34px;color:white;text-align:center;
  background:
    radial-gradient(circle at 50% 15%,rgba(85,199,232,.22),transparent 18rem),
    linear-gradient(140deg,#081630,#0c2855);
  box-shadow:var(--shadow)
}
.result-seal{
  width:66px;height:66px;margin:0 auto 16px;border-radius:50%;
  display:grid;place-items:center;color:#0d2246;background:linear-gradient(145deg,#5bccea,#78dcb9);
  font-weight:900;font-size:23px
}
.results-hero h1{margin:0;font-size:32px}
.result-score{margin:12px 0 1px;font-size:64px;line-height:1;font-weight:900;letter-spacing:-.06em}
.result-score-label{color:#9fb2d2;font-size:9px;font-weight:900;letter-spacing:.14em;text-transform:uppercase}
.result-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-top:26px}
.result-stat{
  padding:15px;border-radius:14px;background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.08)
}
.result-stat span{display:block;color:#91a7c9;font-size:9px;text-transform:uppercase;letter-spacing:.08em}
.result-stat strong{display:block;margin-top:5px;font-size:20px}
.results-actions{display:flex;gap:10px;justify-content:center;margin-top:18px;flex-wrap:wrap}
.result-primary,.result-secondary{
  min-height:48px;border:0;border-radius:13px;padding:0 20px;font-size:11px;font-weight:850
}
.result-primary{color:white;background:linear-gradient(135deg,#2368ff,#377ef7)}
.result-secondary{color:#dce7f7;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.14)}
.review{margin-top:26px}
.review-head h2{margin:6px 0 3px;font-size:29px}
.review-head p{margin:0;color:var(--muted);font-size:12px}
.review-list{margin-top:16px;display:grid;gap:10px}
.review-item{
  border:1px solid var(--line);border-radius:16px;padding:17px;background:white
}
.review-item strong{display:block;font-size:13px}
.review-item p{margin:5px 0 0;color:var(--muted);font-size:12px;line-height:1.45}

footer{
  padding:24px 20px 32px;text-align:center;color:#8491a6;font-size:10px;line-height:1.6;
  background:#eef3f9
}

@media(max-width:880px){
  .topic-grid{grid-template-columns:repeat(2,1fr)}
  .learn-layout{grid-template-columns:1fr}
  .learn-nav{display:flex;overflow:auto;padding-bottom:4px}
  .learn-nav button{min-width:155px}
  .page{padding-bottom:95px}
}
@media(max-width:760px){
  .start-grid{grid-template-columns:1fr;gap:28px;min-height:auto}
  .start-copy h1{font-size:40px}
  .rule-banner{grid-template-columns:auto 1fr}
  .rule-banner .learn-link{grid-column:1/-1;width:100%}
  .game-toolbar{grid-template-columns:auto 1fr}
  .score-cluster{grid-column:1/-1;justify-content:flex-end}
  .question{padding:19px}
  .game-bottom{align-items:stretch;flex-direction:column}
  .keyboard-hint{display:none}
  .result-stats{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:560px){
  .page{width:min(100% - 24px,1100px)}
  .topic-grid{grid-template-columns:1fr}
  .start-copy h1{font-size:40px}
  .result-score{font-size:54px}
  .learn-card{padding:20px}
}

.keyboard-hint.advance-hint{color:#244f94;font-weight:800}
.keyboard-hint.advance-hint kbd{
  min-width:31px;display:inline-grid;place-items:center;color:#fff;background:#2868d8;
  border-color:#2868d8;box-shadow:0 3px 8px rgba(40,104,216,.20);font-size:13px;font-weight:900
}
.rush-review-item{padding:19px 20px}
.review-tags{display:flex;gap:7px;align-items:center;margin-bottom:10px;flex-wrap:wrap}
.review-tag{
  padding:5px 8px;border-radius:999px;background:#eef3f9;color:#596783;
  font-size:8px;font-weight:900;letter-spacing:.06em;text-transform:uppercase
}
.review-tag.missed{background:#fff0f1;color:#9a3d48}
.review-tag.correct{background:#eaf9f1;color:#147149}
.review-answer-grid{display:grid;grid-template-columns:1fr 1fr;gap:9px;margin-top:12px}
.review-answer{border-radius:11px;padding:11px 12px;background:#f6f9fd;border:1px solid #e3eaf4}
.review-answer.wrong{background:#fff4f4;border-color:#f0c9cc}
.review-answer.right{background:#effaf4;border-color:#bee5d1}
.review-answer span{display:block;margin-bottom:4px;color:#8793a8;font-size:8px;font-weight:900;letter-spacing:.06em;text-transform:uppercase}
.review-answer strong{font-size:11px;line-height:1.4}
.review-why{margin-top:10px!important;padding-top:10px;border-top:1px solid #e6ebf2}
@media(max-width:560px){.review-answer-grid{grid-template-columns:1fr}}


/* Optional persisted dark mode */
body.dark-mode{background:#0b1120;color:#e7edf7;--off:#0b1120;--ink:#e7edf7;--muted:#9aa8c0;--line:#29354d}
body.dark-mode header{background:#101827;border-bottom-color:#29354d;color:#e7edf7}
body.dark-mode .brand-logo{background:#101827;border-radius:50%}
body.dark-mode .brand-copy strong{color:#f2f5fb}
body.dark-mode .nav button{color:#9aa8c0}
body.dark-mode .nav button.active{color:#fff;border-bottom-color:#fff}
body.dark-mode .theme-toggle{background:#172238;color:#e7edf7;border-color:#36445f}
body.dark-mode .theme-toggle:hover{background:#223252;border-color:#7198e8;color:#fff}
body.dark-mode main{--ink:#e7edf7;--muted:#a4b0c5;--line:#2a3750;--soft:#182338;--paper:#111b2b;--green-bg:#12392c;--red-bg:#3b2029;--gold-bg:#382e1b;color:#e7edf7;background:radial-gradient(circle at 12% 0%,rgba(33,102,255,.12),transparent 26rem),linear-gradient(180deg,#101827 0,#0b1120 100%)}
body.dark-mode .kicker,body.dark-mode .eyebrow{color:#85adff}
body.dark-mode .start-copy p,body.dark-mode .page-head p{color:#a4b0c5}
body.dark-mode .start-meta{color:#9aa8c0}
body.dark-mode .topic-card,body.dark-mode .learn-card,body.dark-mode .learn-nav button,body.dark-mode .question,body.dark-mode .score-pill,body.dark-mode .review-item{background:#111b2b;border-color:#2a3750;color:#e7edf7}
body.dark-mode .topic-card p,body.dark-mode .rule-item p,body.dark-mode .review-item p{color:#a4b0c5}
body.dark-mode .topic-num,body.dark-mode .topic-best{color:#9aa8c0}
body.dark-mode .topic-best strong{color:#d1dcee}
body.dark-mode .learn-nav button{color:#c0cbe0}
body.dark-mode .learn-nav button:hover,body.dark-mode .learn-nav button.active{color:#a9c5ff;border-color:#4266a9;background:#1b2a45}
body.dark-mode .rule-item{background:#172338;border-color:#2a3750}
body.dark-mode .rule-item.callout{background:#182c49;border-color:#304c79}
body.dark-mode .rule-item.warning{background:#30291b;border-color:#62502a}
body.dark-mode .source-note{color:#97a6bd;border-top-color:#2a3750}
body.dark-mode .meta-pill{background:#202d43;color:#bdc9dc}
body.dark-mode .meta-pill.blue{background:#1b2e50;color:#a9c5ff}
body.dark-mode .answer{color:#e3ebf8;background:#172338;border-color:#33425d}
body.dark-mode .answer:hover:not(:disabled){background:#203252;border-color:#7198e8}
body.dark-mode .answer-key{background:#111b2b;border-color:#33425d;color:#e3ebf8}
body.dark-mode .answers.secure-rush-answers .answer.pending{
  color:#dbeaff;border-color:#75aaff;background:#213e67;
  box-shadow:inset 0 0 0 1px #75aaff
}
body.dark-mode .answers.secure-rush-answers .answer.pending .answer-key{
  color:white;border-color:#75aaff;background:#356dc0
}
/* These must override dark-mode's generic answer backgrounds. */
body.dark-mode .answer.correct{color:#b9f0d5;border-color:#27664d;background:#12392c}
body.dark-mode .answer.wrong{color:#ffc2c7;border-color:#74333d;background:#3b2029}
body.dark-mode .answer.correct .answer-key{color:white;border-color:transparent;background:var(--green)}
body.dark-mode .answer.wrong .answer-key{color:white;border-color:transparent;background:var(--red)}
body.dark-mode .answer.dim{opacity:.48}
body.dark-mode .feedback.good{color:#b9f0d5;background:#12392c;border-color:#27664d}
body.dark-mode .feedback.bad{color:#ffc2c7;background:#3b2029;border-color:#74333d}
body.dark-mode .feedback p{color:#c5d0e1}
body.dark-mode .keyboard-hint{color:#b1bfd5}
body.dark-mode .keyboard-hint kbd{background:#172338;border-color:#34435c;color:#edf3ff}
body.dark-mode .progress-track{background:#26334a}
body.dark-mode .review-answer{background:#172338;border-color:#2a3750}
body.dark-mode .review-answer.wrong{background:#3b2029;border-color:#74333d}
body.dark-mode .review-answer.right{background:#12392c;border-color:#27664d}
body.dark-mode .review-answer span{color:#a4b0c5}
body.dark-mode .review-why{border-top-color:#2a3750}
body.dark-mode footer{background:#101827;color:#9aa8c0}
body.dark-mode .rule-banner{background:linear-gradient(135deg,#101b30,#172c4c)}
body.dark-mode .rule-banner p{color:#b5c4dc}
body.dark-mode .start-footer{border-color:#2a3750;color:#9aa8c0}
body.dark-mode .start-footer strong{color:#d1dcee}
@media(max-width:760px){
  .header-inner{gap:10px}
  .brand-logo{width:48px;height:48px}
  .brand-copy strong{font-size:14px}
  .nav{gap:12px}
  .nav button{font-size:12px}
  .theme-toggle{font-size:10px;padding:7px 8px}
}
@media(max-width:480px){
  .header-inner{width:calc(100% - 20px);gap:8px}
  .brand-logo{width:36px;height:36px}
  .brand-copy strong{font-size:12px}
  .nav{gap:9px}
  .nav button{font-size:11px}
  .theme-toggle{padding:6px;font-size:9px}
}

/* ---------- Accounts, shared leaderboards and administrator tools ---------- */
.header-actions{display:flex;align-items:center;gap:9px;position:relative;flex-shrink:0}
.account-btn{border:1px solid #dce6f4;border-radius:9px;background:#0d1833;color:#fff;padding:9px 12px;max-width:190px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:11px;font-weight:850}
.account-btn:hover{background:#1b2e50}
.account-menu{position:absolute;right:0;top:calc(100% + 12px);z-index:30;width:250px;padding:10px;background:var(--paper);border:1px solid var(--line);border-radius:14px;box-shadow:0 16px 45px rgba(16,37,81,.18);display:grid;gap:4px;color:var(--ink)}
.account-menu-summary{padding:10px 10px 12px;border-bottom:1px solid var(--line);margin-bottom:4px;overflow-wrap:anywhere}
.account-menu-summary strong,.account-menu-summary span{display:block}
.account-menu-summary strong{font-size:13px}
.account-menu-summary span{margin-top:4px;color:var(--muted);font-size:11px}
.account-menu-summary .account-level{text-transform:capitalize;font-weight:800;color:#2465d8}
.account-menu button{border:0;border-radius:8px;background:transparent;text-align:left;padding:10px;color:var(--ink);font-size:12px;font-weight:750}
.account-menu button:hover{background:var(--soft)}
.leaderboard-controls{display:flex;align-items:flex-end;flex-wrap:wrap;gap:12px;margin:18px 0 12px;padding:16px;background:var(--paper);border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow-sm)}
.leaderboard-controls label,.auth-card label{display:grid;gap:7px;min-width:150px;flex:1;color:var(--muted);font-size:10px;font-weight:850;letter-spacing:.03em}
.leaderboard-controls select,.auth-card input,.admin-card textarea{min-height:42px;width:100%;padding:10px 12px;border-radius:10px;border:1px solid var(--line);background:var(--paper);color:var(--ink);font:inherit;font-size:12px;letter-spacing:0}
.leaderboard-controls button{min-height:42px;white-space:nowrap}
.inline-status{min-height:18px;margin:10px 0;color:var(--muted);font-size:12px;line-height:1.5}
.status-error{color:#bd3445!important}
.status-success{color:#08764a!important}
.leaderboard-table-wrap{width:100%;overflow:auto;border:1px solid var(--line);border-radius:15px;background:var(--paper);box-shadow:var(--shadow-sm)}
.leaderboard-table{border-collapse:collapse;width:100%;min-width:570px;text-align:left;font-size:12px}
.leaderboard-table th{padding:13px 16px;background:var(--soft);color:var(--muted);font-size:9px;text-transform:uppercase;letter-spacing:.08em}
.leaderboard-table td{padding:13px 16px;border-top:1px solid var(--line);color:var(--ink);white-space:nowrap}
.leaderboard-table tr:hover td{background:color-mix(in srgb,var(--soft) 65%,transparent)}
.leader-rank{display:inline-grid;place-items:center;min-width:27px;height:27px;border-radius:9px;background:var(--soft);font-weight:900}
.leader-rank.top-rank{background:#e9f8f0;color:#08764a}
.score-cell{font-weight:900;font-variant-numeric:tabular-nums}
.empty-table{text-align:center!important;padding:28px!important;color:var(--muted)!important;white-space:normal!important}
.admin-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);align-items:start;gap:18px}
.admin-card{padding:20px;border-radius:17px;background:var(--paper);border:1px solid var(--line);box-shadow:var(--shadow-sm);min-width:0}
.admin-card h2{margin:0;font-size:18px;letter-spacing:-.03em}
.admin-card p{font-size:12px;line-height:1.55;color:var(--muted)}
.admin-card textarea{display:block;resize:vertical;min-height:120px;margin:10px 0 12px;line-height:1.5;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:11px}
.admin-actions{display:flex;flex-wrap:wrap;gap:8px}
.admin-actions button,.admin-card>button{min-height:38px;border-radius:9px;padding:9px 12px;font-size:11px;font-weight:850}
.admin-output-label{display:block;margin-top:16px;font-size:10px;font-weight:900;color:var(--muted);text-transform:uppercase;letter-spacing:.06em}
.admin-warning{padding:11px 12px;border-radius:10px;background:#fff7df;color:#785820!important;font-size:10px!important}
.admin-card-heading{display:flex;justify-content:space-between;align-items:flex-start;gap:12px}
.admin-card-heading h2{margin-top:2px}
.admin-card-heading p{margin-top:5px}
.admin-card-heading button{flex-shrink:0;min-height:36px;padding:8px 10px;font-size:10px}
.admin-users-list{display:grid;gap:8px;margin-top:12px}
.admin-user{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:12px;border:1px solid var(--line);border-radius:12px;min-width:0}
.admin-user-main{display:grid;min-width:0;gap:4px;overflow-wrap:anywhere}
.admin-user-main strong{font-size:12px}
.admin-user-main span{font-size:10px;color:var(--muted)}
.admin-user-main small{font-size:9px;color:var(--muted);text-transform:capitalize}
.admin-user-actions{display:grid;flex-shrink:0;gap:5px}
.admin-user-actions button{font-size:9px;font-weight:850;padding:7px 8px;border:1px solid var(--line);border-radius:7px;color:var(--ink);background:var(--soft)}
.admin-user-actions button:hover{border-color:#8ba7e8}
.auth-modal{position:fixed;inset:0;z-index:100;display:grid;place-items:center;padding:20px;background:rgba(6,15,34,.62);backdrop-filter:blur(5px)}
.auth-card{position:relative;width:min(100%,420px);max-height:calc(100vh - 40px);overflow:auto;padding:28px;border-radius:20px;background:var(--paper);border:1px solid var(--line);box-shadow:0 22px 90px rgba(0,0,0,.28);color:var(--ink)}
.auth-close{position:absolute;top:16px;right:16px;width:32px;height:32px;border:1px solid var(--line);border-radius:9px;background:var(--soft);color:var(--ink);font-size:20px;line-height:1}
.auth-card h2{margin:9px 34px 7px 0;font-size:28px;letter-spacing:-.04em}
.auth-card>p:not(.inline-status){margin:0 0 18px;color:var(--muted);font-size:12px;line-height:1.55}
.auth-card form{display:grid;gap:12px}
.auth-card form button{min-height:45px;margin-top:4px}
.auth-card .inline-status{overflow-wrap:anywhere}
.result-sync-status{max-width:760px;margin:14px auto 0;text-align:center}
body.dark-mode .header-actions .account-btn{background:#223252;border-color:#36445f;color:#f1f5fc}
body.dark-mode .account-menu{background:#111b2b;border-color:#2a3750;color:#e7edf7;box-shadow:0 16px 45px rgba(0,0,0,.4)}
body.dark-mode .account-menu button{color:#e7edf7}
body.dark-mode .account-menu button:hover{background:#1b2a45}
body.dark-mode .account-menu-summary{border-bottom-color:#2a3750}
body.dark-mode .account-menu-summary .account-level{color:#9fbeff}
body.dark-mode .leaderboard-controls,body.dark-mode .leaderboard-table-wrap,body.dark-mode .admin-card{background:#111b2b;border-color:#2a3750}
body.dark-mode .leaderboard-controls select,body.dark-mode .auth-card input,body.dark-mode .admin-card textarea{background:#172338;border-color:#33425d;color:#e7edf7}
body.dark-mode .leaderboard-table th{background:#172338;color:#a4b0c5}
body.dark-mode .leaderboard-table td{border-top-color:#2a3750;color:#e7edf7}
body.dark-mode .leader-rank{background:#202d43}
body.dark-mode .leader-rank.top-rank{background:#12392c;color:#b9f0d5}
body.dark-mode .admin-user{border-color:#2a3750}
body.dark-mode .admin-user-actions button{background:#172338;border-color:#33425d;color:#e7edf7}
body.dark-mode .admin-warning{background:#30291b;color:#e5cc8c!important}
body.dark-mode .auth-card{background:#111b2b;border-color:#2a3750;color:#e7edf7}
body.dark-mode .auth-close{background:#172338;border-color:#33425d;color:#e7edf7}
@media(max-width:980px){
  .header-inner{gap:12px}
  .nav{gap:13px}
  .nav button{font-size:13px}
  .brand-logo{width:52px;height:52px}
  .brand-copy strong{font-size:14px}
  .admin-grid{grid-template-columns:1fr}
}
@media(max-width:760px){
  header{height:auto;min-height:76px}
  .header-inner{height:auto;min-height:68px;padding:8px 0;flex-wrap:wrap;row-gap:8px}
  .brand{flex:1}
  .brand-logo{width:40px;height:40px}
  .brand-copy strong{font-size:13px}
  .header-actions{margin-left:auto}
  .theme-toggle{font-size:10px;padding:7px 8px}
  .account-btn{max-width:120px;padding:8px 9px;font-size:10px}
  .nav{order:3;width:100%;justify-content:center;gap:24px;padding:0 0 2px}
  .nav button{font-size:12px}
  .leaderboard-controls{align-items:stretch}
  .leaderboard-controls label{min-width:calc(50% - 8px)}
  .leaderboard-controls>button{width:100%}
}
@media(max-width:480px){
  .header-inner{width:calc(100% - 20px)}
  .brand{gap:6px}
  .brand-logo{width:34px;height:34px}
  .brand-copy strong{font-size:11px}
  .header-actions{gap:5px}
  .theme-toggle{font-size:0;padding:7px 8px}
  .theme-toggle:after{content:"☾";font-size:14px}
  body.dark-mode .theme-toggle:after{content:"☼"}
  .account-btn{font-size:9px;max-width:105px;padding:7px 8px}
  .nav{gap:17px}
  .nav button{font-size:11px}
  .leaderboard-controls label{min-width:100%}
  .admin-card{padding:14px}
  .admin-user{align-items:flex-start;flex-direction:column}
  .admin-user-actions{width:100%;grid-template-columns:1fr 1fr}
  .auth-card{padding:22px}
}


/* Microsoft single-sign-on */
.microsoft-signin { display:flex; align-items:center; justify-content:center; gap:12px; width:100%; margin-top:16px; }
.microsoft-mark { display:inline-grid; grid-template-columns:repeat(2,8px); grid-template-rows:repeat(2,8px); gap:2px; flex:0 0 auto; }
.microsoft-mark i { display:block; width:8px; height:8px; background:#f25022; }
.microsoft-mark i:nth-child(2) { background:#7fba00; }
.microsoft-mark i:nth-child(3) { background:#00a4ef; }
.microsoft-mark i:nth-child(4) { background:#ffb900; }
.auth-domain-note { margin-top:14px; color:var(--muted, #64748b); font-size:.9rem; line-height:1.5; }

/* DIAMUN header controls: compact, readable in either theme */
.header-actions{gap:9px}
.header-actions .theme-toggle,.header-actions .account-btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:38px;padding:8px 12px;border-radius:9px;
  font-family:Inter,ui-sans-serif,system-ui,sans-serif;font-size:11px;font-weight:750;
  letter-spacing:0;line-height:1;transition:background .16s ease,border-color .16s ease,box-shadow .16s ease,transform .16s ease
}
.header-actions .theme-toggle{background:#f4f6fa;color:#283c58;border:1px solid #d9e2ee}
.header-actions .theme-toggle:hover{background:#eaf0f9;border-color:#a3b6d4}
.theme-toggle .mode-icon{font-size:17px;line-height:1;display:block}
.theme-toggle .mode-label{font-size:11px}
.header-actions .account-btn{background:#17264b;color:#fff;border:1px solid #17264b;min-width:90px}
.header-actions .account-btn:hover{background:#284475;border-color:#284475;box-shadow:0 3px 12px rgba(15,40,88,.15)}
.header-actions .theme-toggle:active,.header-actions .account-btn:active{transform:translateY(1px)}
body.dark-mode .header-actions .theme-toggle{background:#1c2a41;color:#e8efff;border-color:#40516f}
body.dark-mode .header-actions .theme-toggle:hover{background:#30425e}
body.dark-mode .header-actions .account-btn{background:#dbe8fd;color:#152849;border-color:#dbe8fd}
body.dark-mode .header-actions .account-btn:hover{background:#f3f7ff}
.auth-modal{background:rgba(8,17,36,.60);backdrop-filter:blur(7px);animation:diBackdrop .18s ease both}
.auth-modal .auth-card{
  width:min(100%,410px);padding:32px;border-radius:16px;
  border:1px solid #dce4f0;background:#fff;box-shadow:0 24px 75px rgba(5,17,44,.30);
  color:#14233e;font-family:Inter,ui-sans-serif,system-ui,sans-serif;
  animation:diModalIn .24s cubic-bezier(.2,.8,.2,1) both
}
.auth-card .auth-kicker{display:block;color:#4b6180;font-size:10px;font-weight:800;letter-spacing:.12em;text-transform:uppercase}
.auth-card h2{font-size:30px;font-weight:750;color:#112443;letter-spacing:-.045em;margin:23px 0 8px}
.auth-card #auth-intro{margin:0 0 22px;font-size:13px;color:#65738a}
.auth-card .auth-close{
  display:grid;place-items:center;top:19px;right:20px;border:0;border-radius:8px;
  width:34px;height:34px;background:#f0f3f8;color:#637086;font-size:22px
}
.auth-card .auth-close:hover{background:#dfe8f4;color:#193051}
.auth-card .microsoft-signin{
  display:flex;align-items:center;justify-content:center;gap:12px;width:100%;min-height:53px;
  padding:12px 16px;border:1px solid #b9cbe1;border-radius:10px;background:#fff;color:#19304f;
  font-family:Inter,ui-sans-serif,system-ui,sans-serif;font-size:13px;font-weight:700;
  box-shadow:0 2px 8px rgba(11,35,72,.04);transition:background .16s,border-color .16s,box-shadow .16s,transform .16s
}
.auth-card .microsoft-signin:hover:not(:disabled){background:#f5f8fd;border-color:#8baacd;box-shadow:0 5px 16px rgba(18,43,78,.12);transform:translateY(-1px)}
.auth-card .microsoft-signin:disabled{opacity:.8;cursor:wait}
.auth-card #microsoft-label{flex:1;text-align:center}
.auth-card .signin-arrow{font-size:19px;color:#8a9ab0;line-height:1}
.auth-card .signin-spinner{display:none;width:17px;height:17px;flex:none;border:2px solid #d8e2f0;border-top-color:#2e70d3;border-radius:50%;animation:diSpin .75s linear infinite}
.auth-card .microsoft-signin.is-loading .signin-spinner{display:block}
.auth-card .microsoft-signin.is-loading .signin-arrow{display:none}
.auth-card .inline-status{min-height:0;margin:13px 0 0;font-size:11px;line-height:1.5}
.auth-card .auth-domain-note{margin:20px 0 0;padding-top:15px;border-top:1px solid #e9eef5;font-size:11px;color:#8290a2}
body.dark-mode .auth-modal .auth-card{background:#151f30;border-color:#34435c;color:#e8eefb}
body.dark-mode .auth-card h2{color:#eef4ff}
body.dark-mode .auth-card #auth-intro,body.dark-mode .auth-card .auth-domain-note{color:#aab7cb}
body.dark-mode .auth-card .auth-kicker{color:#afc1dd}
body.dark-mode .auth-card .auth-domain-note{border-top-color:#304059}
body.dark-mode .auth-card .microsoft-signin{background:#eaf0f9;color:#19304f;border-color:#b9cbe1}
body.dark-mode .auth-card .microsoft-signin:hover:not(:disabled){background:#fff}
@keyframes diBackdrop{from{opacity:0}to{opacity:1}}
@keyframes diModalIn{from{opacity:0;transform:translateY(12px) scale(.986)}to{opacity:1;transform:none}}
@keyframes diSpin{to{transform:rotate(360deg)}}
@media(max-width:760px){.theme-toggle .mode-label{display:none}}
@media(max-width:480px){
  .header-actions .theme-toggle,.header-actions .account-btn{padding:8px;min-height:34px}
  .header-actions .theme-toggle{font-size:11px}
  .header-actions .theme-toggle:after,body.dark-mode .header-actions .theme-toggle:after{content:none}
  .auth-modal .auth-card{padding:24px}
}
@media(prefers-reduced-motion:reduce){
  .auth-modal,.auth-modal .auth-card,.signin-spinner{animation:none!important}
  .header-actions .theme-toggle,.header-actions .account-btn,.auth-card .microsoft-signin{transition:none!important}
}

:root{--site-font:"IBM Plex Sans","Helvetica Neue",Arial,sans-serif}
html,body,body *,button,input,select,textarea,main,header,footer,.auth-card{font-family:var(--site-font)!important}
.results-hero{padding-top:43px}
.result-save-prompt{width:min(100%,640px);margin:27px auto 0;padding:18px;display:flex;align-items:center;justify-content:space-between;gap:18px;text-align:left;border:1px solid rgba(185,212,250,.32);border-radius:13px;background:rgba(255,255,255,.095)}
.result-save-copy{display:grid;gap:6px}
.result-save-copy strong{font-size:16px;font-weight:700;color:#fff;line-height:1.3}
.result-save-copy span{font-size:12px;color:#c3d2e7;line-height:1.5}
.result-save-btn{display:flex;align-items:center;justify-content:center;gap:12px;min-height:44px;flex-shrink:0;padding:0 17px;border:0;border-radius:9px;background:#edf4ff;color:#153052;font-size:13px;font-weight:700;transition:background .16s,transform .16s}
.result-save-btn:hover{background:#fff;transform:translateY(-1px)}
.results-hero .result-sync-status:not(:empty){margin:13px auto 0;color:#cfddf0;font-size:12px}
.save-confirmation{position:fixed;bottom:22px;right:20px;z-index:120;pointer-events:none;opacity:0;transform:translateY(8px);padding:12px 16px;border-radius:8px;background:#153f2d;border:1px solid #3b825e;color:#fff;box-shadow:0 8px 30px rgba(0,0,0,.24);font-size:13px;transition:opacity .2s,transform .2s}
.save-confirmation.is-visible{opacity:1;transform:translateY(0)}
.learn-card{padding:32px 36px}
.learn-note-index{display:flex;justify-content:space-between;gap:12px;border-bottom:1px solid #dce4f0;padding-bottom:14px;margin-bottom:19px}
.learn-note-index span{font-size:10px;font-weight:700;color:#6d809b;letter-spacing:.07em;text-transform:uppercase}
.learn-overview{color:#52647f;font-size:14px;line-height:1.8;max-width:70ch;margin:12px 0 0}
.learn-steps{margin:27px 0;padding:19px 22px;border:1px solid #d9e4f2;border-radius:12px;background:#f5f9ff}
.learn-steps h3,.learn-mistakes h3{font-size:16px;margin:0 0 13px}
.learn-steps ol{margin:0;padding-left:24px;display:grid;gap:10px}
.learn-steps li,.learn-mistakes li{font-size:13px;line-height:1.7;color:#495c78}
.learn-steps li::marker{font-weight:700;color:#266ac2}
.learn-rule-heading{margin:24px 0 5px;font-weight:700;font-size:16px}
.learn-section{padding:20px 0;border-bottom:1px solid #e0e8f2}
.learn-section h3{margin:0 0 8px;font-size:16px;line-height:1.35}
.learn-section p{margin:0;color:#4b607b;font-size:13px;line-height:1.78}
.learn-example{margin:12px 0 0;padding:11px 15px;background:#f2f7fd;border-left:3px solid #397bc9;font-size:12px;line-height:1.65;color:#365674}
.learn-example strong{display:block;margin-bottom:3px;font-size:10px;text-transform:uppercase;color:#2863ad;letter-spacing:.05em}
.learn-mistakes{margin:26px 0 0;padding-top:19px;border-top:2px solid #15365c}
.learn-mistakes ul{padding-left:22px;margin:0;display:grid;gap:9px}
.learn-summary{margin-top:22px;padding:16px 18px;border-left:3px solid #2c75cf;border-radius:4px;background:#e9f2fd;font-size:13px;line-height:1.65;color:#224973}
.learn-source-label{margin-top:15px;font-size:11px;line-height:1.65;color:#75859a}
body.dark-mode .learn-note-index,body.dark-mode .learn-section{border-bottom-color:#314158}
body.dark-mode .learn-note-index span,body.dark-mode .learn-source-label{color:#a4b6d0}
body.dark-mode .learn-overview,body.dark-mode .learn-section p,body.dark-mode .learn-mistakes li{color:#b2bfd2}
body.dark-mode .learn-steps{background:#182b44;border-color:#354d69}
body.dark-mode .learn-steps li{color:#cad8e9}
body.dark-mode .learn-example{background:#172d47;border-left-color:#8aaff0;color:#c5d8f1}
body.dark-mode .learn-example strong{color:#a8c9fa}
body.dark-mode .learn-mistakes{border-top-color:#88aee6}
body.dark-mode .learn-summary{background:#1a3555;color:#c8ddfa;border-left-color:#8cafe6}
@media(max-width:720px){.learn-card{padding:23px 20px}}
@media(max-width:590px){.result-save-prompt{flex-direction:column;align-items:stretch}.result-save-btn{width:100%}}

/* Minimal icon-only appearance switch: no duplicate pseudo-icons or visible labels. */
body .header-actions .theme-toggle,
body.dark-mode .header-actions .theme-toggle {
  width:40px; height:40px; min-width:40px; min-height:40px;
  padding:0;gap:0;border-radius:11px;
  display:inline-flex;align-items:center;justify-content:center;
  border:1px solid var(--line);
  background:transparent;color:inherit;
  box-shadow:none;
}
body .header-actions .theme-toggle:hover {
  background:rgba(55,111,186,.10);border-color:#93aed3;
}
body.dark-mode .header-actions .theme-toggle:hover {
  background:rgba(182,208,245,.12);border-color:#688cb7;
}
body .header-actions .theme-toggle .mode-label{display:none!important}
body .header-actions .theme-toggle .mode-icon{display:grid;place-items:center;width:20px;height:20px}
body .header-actions .theme-toggle .mode-icon svg{width:19px;height:19px}
body .header-actions .theme-toggle::after,
body.dark-mode .header-actions .theme-toggle::after{display:none!important;content:none!important}
body .header-actions .theme-toggle:focus-visible{outline:3px solid #92b5e8;outline-offset:3px}
@media(max-width:480px){body .header-actions .theme-toggle,body.dark-mode .header-actions .theme-toggle{width:36px;height:36px;min-width:36px;min-height:36px;padding:0}}

/* DIAMUN Game: header logo at a deliberate scale on all breakpoints */
.header-inner .brand-logo{
  display:block;width:54px;height:54px;max-height:54px;flex-shrink:0;
  object-fit:contain;border-radius:0;
}
.header-inner .brand{gap:10px}
@media(max-width:700px){.header-inner .brand-logo{width:42px;height:42px;max-height:42px}}
@media(max-width:460px){.header-inner .brand-logo{width:38px;height:38px;max-height:38px}}

/* CCA leaderboards: side by side, no comparison of incomparable game modes */
.leaderboard-panels{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;align-items:start;margin-top:18px}
.score-panel{border:1px solid #d9e3f0;border-radius:13px;background:#fff;overflow:hidden}
.score-panel-head{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:20px 20px 9px}
.score-panel-kicker{display:block;text-transform:uppercase;font-size:10px;font-weight:700;letter-spacing:.09em;color:#4b78ac;margin-bottom:5px}
.score-panel-head h2{font-size:21px;letter-spacing:-.04em;margin:0;line-height:1.2}
.score-panel-caption{padding:0 20px 16px;margin:0;color:#647389;font-size:12px}
.score-level-select{display:flex;align-items:center;gap:6px;color:#586b83;font-size:11px;font-weight:650}
.score-level-select select{font-size:12px;font-weight:650;padding:7px 26px 7px 9px;border:1px solid #d4e0ee;border-radius:8px;max-width:130px;background:transparent}
.leader-refresh{padding:8px 11px;border:1px solid #c9d9ee;border-radius:8px;color:#214a7b;background:transparent;font-size:11px;font-weight:700}
.leader-refresh:hover{background:#eaf2fb}
.score-panel .leaderboard-table-wrap{margin:0;border:0;border-radius:0}
.score-panel .leaderboard-table{min-width:0;width:100%}
.score-panel .leaderboard-table th,.score-panel .leaderboard-table td{padding:12px 15px;font-size:12px}
.score-panel .leaderboard-table th:last-child,.score-panel .leaderboard-table td:last-child{text-align:right}
.score-delegate{display:block;overflow:hidden;white-space:nowrap;text-overflow:ellipsis;max-width:23ch}
.score-level-tag{display:inline-block;margin-top:4px;font-size:10px;color:#6b86a8}
body.dark-mode .score-panel{background:#152338;border-color:#334861}
body.dark-mode .score-panel-caption,body.dark-mode .score-level-select{color:#adbed6}
body.dark-mode .score-level-select select{color:#eef5ff;background:#1a2c44;border-color:#4c607e}
body.dark-mode .leader-refresh{color:#cee1fa;border-color:#486789}
body.dark-mode .leader-refresh:hover{background:#2c425f}
@media(max-width:800px){.leaderboard-panels{grid-template-columns:1fr}}

/* Experience selection: compact, clear, no generic filler */
.level-card{max-width:430px}
.level-intro{font-size:13px;line-height:1.6;color:#6b7890}
.level-options{display:grid;gap:9px;margin:22px 0}
.level-options label{display:flex;align-items:center;gap:12px;cursor:pointer;padding:13px 15px;border:1px solid #d9e1ed;border-radius:9px}
.level-options label:has(input:checked){background:#eaf2ff;border-color:#588ada}
.level-options input{accent-color:#226dd4;width:16px;height:16px;flex-shrink:0}
.level-options span{display:flex;flex-direction:column;gap:3px}
.level-options strong{font-size:13px}
.level-options small{font-size:11px;color:#667991}
.level-save{display:block;width:100%;min-height:43px}
body.dark-mode .level-intro,body.dark-mode .level-options small{color:#b1c1d4}
body.dark-mode .level-options label{border-color:#3a506c}
body.dark-mode .level-options label:has(input:checked){background:#213955;border-color:#81acee}

/* Level selection belongs directly to Rush, before Start. */
.rush-difficulty{display:flex;align-items:center;justify-content:space-between;gap:10px;flex-wrap:wrap;background:transparent;padding:0 0 4px}
.rush-difficulty-label{font-weight:750;font-size:12px;color:#435676;letter-spacing:.01em}
.rush-difficulty-options{display:flex;flex-wrap:wrap;gap:5px;padding:4px;border:1px solid #d7e0ec;background:#fff;border-radius:10px}
.rush-difficulty-options button{background:transparent;border:0;border-radius:7px;padding:10px 12px;font-size:12px;font-weight:700;color:#52627a;cursor:pointer;min-height:37px;transition:background .14s,color .14s}
.rush-difficulty-options button.active,.rush-difficulty-options button[aria-pressed="true"]{background:#152a4d;color:#fff;box-shadow:0 1px 4px rgba(16,37,77,.15)}
.rush-difficulty-options button:hover:not(.active):not(:disabled){background:#eaf0f9;color:#1a467e}
.rush-difficulty-options button:focus-visible{outline:3px solid #76aaff;outline-offset:2px}
.rush-difficulty-options button:disabled{opacity:.55;cursor:wait}
.start-btn:disabled{opacity:.62;cursor:wait;transform:none!important}
.rush-difficulty-status{width:100%;margin:0;font-size:11px;font-weight:650;color:#60748e}
.rush-difficulty-status.is-error{color:#ae3741}
body.dark-mode .rush-difficulty-label{color:#bdcce0}
body.dark-mode .rush-difficulty-options{background:#182639;border-color:#41536c}
body.dark-mode .rush-difficulty-options button{color:#c6d2e5}
body.dark-mode .rush-difficulty-options button.active,body.dark-mode .rush-difficulty-options button[aria-pressed="true"]{background:#e2eaf7;color:#122541}
body.dark-mode .rush-difficulty-options button:hover:not(.active):not(:disabled){background:#293e5b;color:#fff}
body.dark-mode .rush-difficulty-status{color:#a9bad1}
body.dark-mode .rush-difficulty-status.is-error{color:#ffb8bf}
@media(max-width:520px){.rush-difficulty{align-items:stretch}.rush-difficulty-options{width:100%;display:grid;grid-template-columns:repeat(3,minmax(0,1fr))}.rush-difficulty-options button{padding:10px 4px;font-size:11px}.rush-difficulty-label{padding-bottom:2px}}

/* DIAMUN CCA UI review – contrast and a measured medal treatment. */
body.dark-mode .topic-num,body.dark-mode .learn-note-index span,body.dark-mode .learn-rule-heading{color:#a7c5ff}
body.dark-mode .score-panel-kicker{color:#bcd7ff}
body.dark-mode .score-panel-caption{color:#bbc9df}
body.dark-mode .score-panel-head h2{color:#f0f5ff}
body.dark-mode #leaderboard-status.status-success{color:#aff0c9!important}
body.dark-mode .topic-action{color:#9bc0ff}
.score-panel .leaderboard-table tr.rank-gold td{background:linear-gradient(90deg,rgba(245,198,74,.25),rgba(245,198,74,.06))}
.score-panel .leaderboard-table tr.rank-silver td{background:linear-gradient(90deg,rgba(161,185,211,.24),rgba(161,185,211,.06))}
.score-panel .leaderboard-table tr.rank-bronze td{background:linear-gradient(90deg,rgba(193,125,74,.24),rgba(193,125,74,.06))}
.score-panel .leaderboard-table tr.rank-gold .leader-rank{background:#ffe1a0;color:#634200}
.score-panel .leaderboard-table tr.rank-silver .leader-rank{background:#e1e9f3;color:#344659}
.score-panel .leaderboard-table tr.rank-bronze .leader-rank{background:#efc3a0;color:#734122}
body.dark-mode .score-panel .leaderboard-table tr.rank-gold td{background:linear-gradient(90deg,rgba(207,159,52,.27),rgba(207,159,52,.08))}
body.dark-mode .score-panel .leaderboard-table tr.rank-silver td{background:linear-gradient(90deg,rgba(152,174,198,.24),rgba(152,174,198,.07))}
body.dark-mode .score-panel .leaderboard-table tr.rank-bronze td{background:linear-gradient(90deg,rgba(188,116,67,.24),rgba(188,116,67,.07))}
.score-level-tag{display:inline-flex;margin-top:5px;padding:3px 9px;border-radius:100px;font-size:10px;font-weight:800;line-height:1.4}
.score-level-tag.tier-beginner{background:#dcf7e8;color:#066b40}
.score-level-tag.tier-intermediate{background:#ffefc5;color:#7b5102}
.score-level-tag.tier-advanced{background:#fce1e1;color:#9b2c3e}
body.dark-mode .score-level-tag.tier-beginner{background:#1a4b3c;color:#b8f5d3}
body.dark-mode .score-level-tag.tier-intermediate{background:#634e26;color:#ffe4a5}
body.dark-mode .score-level-tag.tier-advanced{background:#60313b;color:#ffd1da}
body.dark-mode .brand-logo{background:transparent;border-radius:0;object-fit:contain}
@media(max-width:680px){.score-panel .leaderboard-table th,.score-panel .leaderboard-table td{padding:12px 10px}.score-panel .score-delegate{max-width:19ch}}

/* October 25 feedback: Play page contains only Rush and Scenarios. */
.start-grid{min-height:430px;gap:48px}
.start-actions{align-content:center}
.start-signin-note{order:3;text-align:center;font-size:11px;line-height:1.6;color:var(--muted);margin:10px 8px 0}
body.dark-mode .start-signin-note{color:#b3c9e7}
/* 2027 crest supplied by the team, visible only on dark background. */
.brand-logo-dark{display:none}
body.dark-mode .brand-logo-light{display:none!important}
body.dark-mode .brand-logo-dark{display:block!important;background:transparent!important;border-radius:0!important;object-fit:contain}
.brand-logo{width:64px;height:64px;object-fit:contain}
@media(max-width:700px){.brand-logo{width:48px;height:48px}}
@keyframes diamun-fade-in{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
.view.active{animation:diamun-fade-in .22s ease-out both}
@media(prefers-reduced-motion:reduce){.view.active{animation:none!important}}

/* Official 2027 crest: light and dark images are mutually exclusive. */
.header-inner .brand-logo[hidden]{display:none!important}
body:not(.dark-mode) .header-inner .brand-logo-light{display:block!important}
body:not(.dark-mode) .header-inner .brand-logo-dark{display:none!important}
body.dark-mode .header-inner .brand-logo-light{display:none!important}
body.dark-mode .header-inner .brand-logo-dark{display:block!important}
.start-signin-note{order:-1!important;margin:0 0 6px!important;text-align:left!important;line-height:1.6}
.play-login-link{display:inline;appearance:none;cursor:pointer;background:transparent;border:0;padding:0;font:inherit;font-weight:800;color:#1b5fc4;text-decoration:underline;text-underline-offset:3px}
.play-login-link:hover{color:#0d407e}
.play-login-link:focus-visible{outline:2px solid #3980d5;outline-offset:3px}
body.dark-mode .play-login-link{color:#a1c8ff}
body.dark-mode .play-login-link:hover{color:#d6e9ff}
.start-actions>.start-btn{display:flex;visibility:visible}

/* Confirmed game name: DIAMUN: Diplomats in Action. */
.header-inner .brand-copy .brand-title{
 display:block;font-size:17px;font-weight:800;line-height:1.08;
 letter-spacing:-.025em;white-space:nowrap
}
.header-inner .brand-copy .brand-subtitle{
 display:block;margin-top:4px;font-size:12px;font-weight:650;
 color:#52627a;letter-spacing:-.01em;line-height:1.15;text-transform:none
}
body.dark-mode .header-inner .brand-copy .brand-subtitle{color:#c5d6ee}
@media(max-width:760px){
 header{height:auto;min-height:76px}
 .header-inner{flex-wrap:wrap;row-gap:7px;padding:9px 0}
 .header-inner .brand-copy .brand-title{font-size:15px}
 .header-inner .brand-copy .brand-subtitle{font-size:11px}
 .header-inner .nav{order:3;flex:0 0 100%;justify-content:space-evenly}
}
@media(max-width:440px){
 .header-inner .brand{gap:7px}
 .header-inner .brand-copy .brand-title{font-size:14px}
 .header-inner .brand-copy .brand-subtitle{font-size:10px}
 .header-inner .nav{gap:8px}
}

/* Game navigation and home-card arrows */
.start-actions>.start-btn{justify-content:space-between;gap:20px}
.start-btn .card-arrow{margin-left:auto;flex:0 0 auto;display:grid;place-items:center;width:38px;height:38px}
.start-btn .card-arrow svg,.back-btn svg{width:24px;height:24px}
.back-btn{background:#eaf0f9;color:#173d7a;border-color:#d7e0ec;box-shadow:none}
body.dark-mode .back-btn{background:#1b2a43;color:#e6eefc;border-color:#40536f}
body.dark-mode .back-btn:hover{background:#293e5b;border-color:#7897c7}