:root{--bg:#f4f7fb;--card:#fff;--text:#182033;--muted:#6d7890;--primary:#5b5ce2;--primary2:#7947e8;--line:#e6eaf2;--good:#159b63;--bad:#dc3f52}
*{box-sizing:border-box}body{margin:0;font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;background:linear-gradient(135deg,#eef2ff,#f8fbff 55%,#f6f0ff);color:var(--text);min-height:100vh}
body.dark{--bg:#101522;--card:#171d2d;--text:#f5f7ff;--muted:#aab3c7;--line:#2a3246;background:linear-gradient(135deg,#111628,#171327 55%,#101522)}
a{text-decoration:none;color:inherit}.shell{max-width:1100px;margin:auto;padding:24px}.topbar{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:24px}.brand{display:flex;align-items:center;gap:12px;font-weight:800}.brand-badge{width:42px;height:42px;border-radius:14px;display:grid;place-items:center;background:linear-gradient(135deg,var(--primary),var(--primary2));color:white;box-shadow:0 12px 24px #5b5ce22e}.icon-btn{border:1px solid var(--line);background:var(--card);color:var(--text);border-radius:12px;padding:10px 12px;cursor:pointer}.quiz-card{max-width:760px;margin:24px auto;background:var(--card);border:1px solid var(--line);border-radius:28px;box-shadow:0 24px 70px rgba(43,52,98,.12);overflow:hidden}.quiz-head{padding:24px 26px;background:linear-gradient(135deg,var(--primary),var(--primary2));color:#fff}.quiz-head h1{margin:0 0 6px;font-size:clamp(26px,4vw,40px)}.quiz-head p{margin:0;opacity:.9}.quiz-body{padding:26px}.meta{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;color:var(--muted);font-size:14px;margin-bottom:15px}.progress{height:10px;background:var(--line);border-radius:999px;overflow:hidden;margin-bottom:24px}.progress span{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--primary),var(--primary2));transition:.3s}.question{font-size:clamp(22px,3vw,30px);font-weight:800;line-height:1.25;margin:0 0 22px}.answers{display:grid;gap:12px}.answer{display:flex;gap:12px;align-items:center;text-align:left;border:1px solid var(--line);background:transparent;color:var(--text);border-radius:16px;padding:15px 16px;font-size:16px;cursor:pointer;transition:.2s}.answer:hover{transform:translateY(-1px);border-color:var(--primary)}.answer.correct{border-color:var(--good);background:#159b6314}.answer.wrong{border-color:var(--bad);background:#dc3f5214}.answer .letter{width:32px;height:32px;border-radius:10px;background:var(--line);display:grid;place-items:center;font-weight:800}.actions{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-top:24px}.btn{border:0;border-radius:14px;padding:13px 18px;font-weight:800;cursor:pointer}.btn-primary{background:linear-gradient(135deg,var(--primary),var(--primary2));color:white}.btn-secondary{background:var(--line);color:var(--text)}.result{text-align:center;padding:20px 0}.score-ring{width:150px;height:150px;border-radius:50%;margin:10px auto 22px;display:grid;place-items:center;background:conic-gradient(var(--primary) var(--score),var(--line) 0);position:relative}.score-ring:after{content:"";position:absolute;inset:13px;border-radius:50%;background:var(--card)}.score-ring strong{position:relative;z-index:1;font-size:30px}.hidden{display:none!important}.footer{text-align:center;color:var(--muted);font-size:14px;padding:24px}
@media(max-width:600px){.shell{padding:14px}.quiz-card{border-radius:20px;margin:10px auto}.quiz-body{padding:20px}.quiz-head{padding:22px}.actions{align-items:stretch;flex-direction:column}.btn{width:100%}}


/* Tech Wave Cloud shared header, horizontal ad and footer */
.tw-container{width:min(1180px,calc(100% - 32px));margin-inline:auto}.tw-header{position:sticky;top:0;z-index:100;background:rgba(5,9,39,.96);border-bottom:1px solid rgba(255,255,255,.1);backdrop-filter:blur(14px)}.tw-nav{min-height:68px;display:flex;align-items:center;justify-content:space-between;gap:22px}.tw-logo{display:flex;align-items:center;gap:10px;color:#fff;font-weight:900;letter-spacing:.03em;line-height:.9}.tw-logo>span>span{color:#11d7ff}.tw-logo small{font-size:10px;letter-spacing:.52em;color:#d9e7ff}.tw-logo-mark{width:42px;height:42px;border-radius:50%;display:grid;place-items:center;background:linear-gradient(135deg,#0dd7ff,#0867ff);box-shadow:0 0 24px rgba(13,215,255,.38);font-size:21px}.tw-menu{display:flex;align-items:center;justify-content:center;gap:8px;flex:1}.tw-menu a{color:#f8fbff;font-weight:800;font-size:14px;padding:11px 14px;border-radius:11px}.tw-menu a:hover,.tw-menu a.active{background:#211063}.tw-actions{display:flex;align-items:center;gap:10px}.tw-cta{background:#e11d48;color:#fff;padding:12px 16px;border-radius:11px;font-size:13px;font-weight:900}.tw-theme,.tw-menu-btn{width:44px;height:44px;border-radius:12px;border:1px solid rgba(255,255,255,.18);background:rgba(255,255,255,.06);color:#fff;cursor:pointer}.tw-menu-btn{display:none;font-size:21px}.tw-ad-section{background:var(--card,#fff);border-bottom:1px solid var(--line,#e6eaf2);padding:0;height:130px;min-height:130px;max-height:130px;overflow:hidden;text-align:center}.tw-ad-section .tw-container{height:130px;position:relative}.tw-ad-section .adsbygoogle{display:block!important;width:100%!important;height:130px!important;min-height:130px!important;max-height:130px!important}.tw-ad-label{position:absolute;top:2px;left:0;right:0;z-index:2;display:block;margin:0;color:var(--muted,#6d7890);font-size:10px;font-weight:800;letter-spacing:.12em;text-transform:uppercase}.tw-footer{margin-top:55px;padding:38px 0 18px;background:linear-gradient(135deg,#03102e,#061b4d);color:#d7e3ff}.tw-footer-grid{display:grid;grid-template-columns:1.5fr repeat(3,1fr);gap:34px}.tw-footer p{max-width:330px;color:#c8d4f3;line-height:1.6}.tw-footer h3{margin:0 0 12px;color:#fff;font-size:15px}.tw-footer a:not(.tw-logo){display:block;color:#d7e3ff;padding:6px 0;font-size:14px}.tw-footer-bottom{margin-top:24px;padding-top:15px;border-top:1px solid rgba(255,255,255,.11);display:flex;justify-content:space-between;gap:16px;color:#aebce0;font-size:13px}
@media(max-width:900px){.tw-cta{display:none}.tw-menu-btn{display:block}.tw-menu{display:none;position:absolute;top:68px;left:16px;right:16px;flex-direction:column;align-items:stretch;background:#071047;border:1px solid rgba(255,255,255,.12);border-radius:15px;padding:10px;box-shadow:0 22px 55px rgba(0,0,0,.3)}.tw-menu.open{display:flex}.tw-footer-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:600px){.tw-container{width:min(100% - 24px,1180px)}.tw-nav{min-height:64px}.tw-logo-mark{width:38px;height:38px}.tw-logo{font-size:14px}.tw-theme,.tw-menu-btn{width:40px;height:40px}.tw-ad-section{padding:0;height:130px;min-height:130px;max-height:130px}.tw-ad-section .adsbygoogle{height:130px!important;min-height:130px!important;max-height:130px!important}.tw-footer-grid{grid-template-columns:1fr}.tw-footer-bottom{flex-direction:column;text-align:center}.tw-footer{margin-top:35px}}

/* Strict 130px AdSense height, including Google-generated wrappers */
.tw-ad-section,
.tw-ad-section .tw-container,
.tw-ad-section .adsbygoogle {
  height:130px!important;
  min-height:130px!important;
  max-height:130px!important;
  overflow:hidden!important;
}
.tw-ad-section [id^="aswift_"][id$="_host"],
.tw-ad-section [id^="aswift_"],
.tw-ad-section .google-auto-placed,
.tw-ad-section .google-aif,
.tw-ad-section iframe {
  height:130px!important;
  min-height:130px!important;
  max-height:130px!important;
  overflow:hidden!important;
}


/* All quiz categories left sidebar */
.shell.quiz-layout{max-width:1320px;display:grid;grid-template-columns:270px minmax(0,1fr);gap:24px;align-items:start}
.quiz-sidebar{position:sticky;top:92px;margin-top:24px;background:var(--card);border:1px solid var(--line);border-radius:22px;box-shadow:0 18px 52px rgba(43,52,98,.10);overflow:hidden}
.quiz-sidebar-title{padding:18px 18px 14px;background:linear-gradient(135deg,var(--primary),var(--primary2));color:#fff}
.quiz-sidebar-title strong{display:block;font-size:19px}.quiz-sidebar-title small{display:block;margin-top:4px;opacity:.88}
.quiz-category-list{max-height:calc(100vh - 180px);overflow:auto;padding:10px}
.quiz-category-link{display:flex;align-items:center;gap:10px;padding:10px 11px;margin:2px 0;border-radius:11px;color:var(--text);font-size:14px;font-weight:750;line-height:1.25;transition:.18s ease}
.quiz-category-link:hover{background:var(--line);transform:translateX(2px)}
.quiz-category-link.active{background:linear-gradient(135deg,var(--primary),var(--primary2));color:#fff;box-shadow:0 8px 20px rgba(91,92,226,.24)}
.quiz-category-link .quiz-side-icon{width:27px;height:27px;flex:0 0 27px;display:grid;place-items:center;border-radius:8px;background:rgba(91,92,226,.11);font-size:15px}
.quiz-category-link.active .quiz-side-icon{background:rgba(255,255,255,.18)}
.quiz-layout .quiz-card{width:100%;max-width:900px;margin:24px auto}
.quiz-sidebar-mobile-title{display:none}
@media(max-width:900px){
  .shell.quiz-layout{display:block;max-width:900px}
  .quiz-sidebar{position:static;margin:14px 0 18px;border-radius:18px}
  .quiz-sidebar-title{padding:15px 16px;cursor:pointer}
  .quiz-sidebar-title:after{content:'＋';float:right;margin-top:-30px;font-size:22px}
  .quiz-sidebar.open .quiz-sidebar-title:after{content:'−'}
  .quiz-category-list{display:none;max-height:350px}
  .quiz-sidebar.open .quiz-category-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:3px}
  .quiz-category-link{margin:0}
  .quiz-layout .quiz-card{margin:0 auto}
}
@media(max-width:560px){
  .quiz-sidebar.open .quiz-category-list{grid-template-columns:1fr}
  .quiz-category-list{max-height:380px}
}

/* Enhanced typed-answer flag quiz */
.flag-quiz-card{min-width:0}
.flag-game{text-align:center}
.flag-stage{width:min(620px,100%);aspect-ratio:16/9;margin:22px auto 14px;padding:18px;display:grid;place-items:center;background:linear-gradient(145deg,#edf4ff,#fff);border:1px solid #dbe6f7;border-radius:22px;box-shadow:0 18px 45px rgba(8,15,59,.12);overflow:hidden}
.main-flag{display:block;max-width:100%;max-height:100%;width:auto;height:auto;object-fit:contain;border-radius:5px;box-shadow:0 7px 22px rgba(0,0,0,.18)}
.flag-question{margin:16px 0 18px;font-size:clamp(22px,3vw,31px);color:#14213d}
.country-answer-row{width:min(700px,100%);margin:auto;display:grid;grid-template-columns:minmax(0,1fr) auto;gap:10px}
.country-input{width:100%;min-height:54px;border:2px solid #cdd9eb;border-radius:13px;padding:0 17px;background:#fff;color:#10203d;font:inherit;font-size:17px;outline:none;transition:.2s}
.country-input:focus{border-color:#0867ff;box-shadow:0 0 0 4px rgba(8,103,255,.12)}
.country-input:disabled{background:#f1f5f9;color:#64748b}
.flag-actions{display:flex;justify-content:center;gap:10px;margin-top:12px}
.flag-feedback{min-height:30px;margin:16px auto 0;font-size:17px;font-weight:800;line-height:1.45}
.flag-feedback.success{color:#087a42}.flag-feedback.wrong,.flag-feedback.error{color:#c62828}.flag-feedback.hint{color:#7c3aed}
.learning-card{width:min(620px,100%);margin:12px auto 0;padding:14px 18px;display:flex;justify-content:center;flex-wrap:wrap;gap:10px 24px;border-radius:13px;background:#eef8ff;border:1px solid #cce9ff;color:#17345d}
.learning-card strong{width:100%;font-size:18px}.learning-card span{font-size:14px;font-weight:700}
.next-flag-preview{width:150px;margin:24px auto 0;padding:9px;border:1px solid #dfe7f3;border-radius:13px;background:#fff}
.next-flag-preview span{display:block;margin-bottom:7px;color:#64748b;font-size:11px;font-weight:900;text-transform:uppercase;letter-spacing:.1em}
.next-flag-preview img{display:block;width:100%;height:72px;object-fit:contain;filter:blur(8px);opacity:.75;transform:scale(.96)}
.review-section{margin:24px 0;text-align:left}.review-section h3{text-align:center}
.review-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
.review-item{display:flex;align-items:center;gap:12px;padding:11px;border:1px solid #e0e7f1;border-radius:12px;background:#fff}
.review-item img{width:76px;height:48px;object-fit:contain;border:1px solid #edf0f5}
.review-item strong,.review-item small{display:block}.review-item small{margin-top:4px;color:#64748b}
.perfect-score{text-align:center;font-weight:800;color:#087a42}
#timer.warning{background:#fee2e2!important;color:#b91c1c!important;animation:flagPulse .7s infinite alternate}
@keyframes flagPulse{to{transform:scale(1.08)}}
body.dark-mode .flag-stage,body.dark-mode .next-flag-preview,body.dark-mode .review-item{background:#111a38;border-color:rgba(255,255,255,.13)}
body.dark-mode .flag-question{color:#fff}body.dark-mode .country-input{background:#081025;border-color:#314262;color:#fff}
body.dark-mode .learning-card{background:#101f42;border-color:#294d7c;color:#dcecff}
@media(max-width:700px){.country-answer-row{grid-template-columns:1fr}.country-answer-row .btn{width:100%}.flag-stage{padding:10px;border-radius:16px}.review-list{grid-template-columns:1fr}.next-flag-preview{width:125px}.flag-actions .btn{flex:1}}