/* category.css
   New stylesheet for category inner pages + the category hub page.
   The base look (colors, card shell, media/answer templates, modals) is
   adapted from the existing premium UI in index.html/test.html so category
   pages feel like the same product. index.html/test.html themselves are
   NOT modified or linked to this file — they keep their own inline <style>.
   Additive-only sections (category header, hub grid, empty state) are new.
*/
*{box-sizing:border-box}
:root{
 --blue:#6858e6;--blue2:#4b3fb8;--white:#fff;--good:#1fae63;--bad:#e0483f;
 --navy-rich:linear-gradient(160deg,#2f2768,#1e1852 65%,#130f36);
 --panel-grad:linear-gradient(135deg,#33297a,#4a3aa3);
 --panel-grad-hover:linear-gradient(135deg,#3d3392,#5b47bd);
 --divider:rgba(255,255,255,.16);
 --accent:#7c8cfa;--accent2:#b388f5;
 --accent-grad:linear-gradient(135deg,#7c8cfa,#b388f5);
 --ink:#211d3d;--ink-dim:#716c92;
 --page-border:#e9e4fa;
 --shadow-lg:0 24px 60px -20px rgba(90,70,190,.24),0 6px 18px -8px rgba(90,70,190,.14);
 --shadow-sm:0 2px 10px rgba(99,90,190,.08),0 1px 3px rgba(99,90,190,.06);
}
html{-webkit-text-size-adjust:100%}
body{
 margin:0;font-family:'Noto Sans Georgian',Arial,sans-serif;color:var(--ink);
 background:
   radial-gradient(1200px 520px at 12% -10%,rgba(139,157,251,.22),transparent 60%),
   radial-gradient(1000px 480px at 100% 8%,rgba(196,181,253,.22),transparent 55%),
   linear-gradient(180deg,#fbfbff,#f4f2fb 60%,#efeafc);
 min-height:100vh;
 overflow-x:hidden;
}
.bg-decor{position:fixed;border-radius:50%;filter:blur(70px);pointer-events:none;z-index:-1;opacity:.5}
.bg-decor.a{width:420px;height:420px;left:-150px;top:-110px;background:linear-gradient(135deg,#8b9dfb,#c9b6fb)}
.bg-decor.b{width:380px;height:380px;right:-130px;top:32%;background:linear-gradient(135deg,#c4b5fd,#93c5fd)}
.bg-decor.c{width:320px;height:320px;left:-110px;bottom:-90px;background:linear-gradient(135deg,#a5b4fc,#f0abfc)}
@media(max-width:900px){.bg-decor{display:none}}
.wrap{max-width:940px;margin:0 auto;padding:28px 18px 64px;position:relative}
.app{min-height:100vh;display:flex;flex-direction:column;gap:18px;animation:appIn .5s ease both}
@keyframes appIn{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}

/* ============================= TOP BAR ============================= */
.top{
 --h-navy:#0c2d47;--h-navy2:#134f6b;--h-teal:#14b8a6;--h-teal2:#0e9aa8;
 --h-ink:#16283a;--h-ink-dim:#5c7080;--h-border:#e3e9ec;--h-glass:rgba(255,255,255,.76);
 position:relative;overflow:hidden;
 display:flex;flex-wrap:wrap;gap:14px;align-items:stretch;
 background:var(--h-glass);border:1px solid rgba(255,255,255,.8);border-radius:24px;
 padding:18px 24px;
 box-shadow:0 18px 40px -18px rgba(12,45,70,.20),0 4px 14px -6px rgba(12,45,70,.12),inset 0 1px 0 rgba(255,255,255,.7);
 backdrop-filter:blur(18px) saturate(160%);-webkit-backdrop-filter:blur(18px) saturate(160%);
}
.top:before{
 content:"";position:absolute;top:-55%;right:-8%;width:230px;height:230px;z-index:0;pointer-events:none;
 background:radial-gradient(circle,rgba(20,184,166,.14),transparent 70%);
}
.top:after{
 content:"";position:absolute;bottom:-70%;left:-6%;width:190px;height:190px;z-index:0;pointer-events:none;
 background:radial-gradient(circle,rgba(12,45,70,.09),transparent 70%);
}
.panel{display:flex;align-items:center;gap:12px;padding:6px 8px;position:relative;z-index:1}
.panel.logo{flex:1 1 200px;min-width:0}
.panel.logo .mark{
 flex:none;width:44px;height:44px;border-radius:13px;display:grid;place-items:center;
 background:linear-gradient(135deg,var(--h-navy),var(--h-navy2));color:#fff;font-weight:900;font-size:19px;letter-spacing:-.5px;
 box-shadow:0 8px 20px -8px rgba(12,45,70,.55),0 0 0 4px rgba(20,184,166,.14);
}
.panel.logo b{display:block;font-size:17px;font-weight:800;color:var(--h-ink);letter-spacing:-.2px}
.panel.logo span{display:block;font-size:12px;font-weight:600;color:var(--h-ink-dim);margin-top:1px}

.panel:nth-child(2){flex:1 1 220px;flex-direction:column;align-items:stretch;justify-content:center;gap:9px}
.timerRow{display:flex;align-items:center;justify-content:center;gap:9px}
.timerRow svg{
 flex:none;color:#fff;background:linear-gradient(135deg,var(--h-navy),var(--h-teal2));
 border-radius:50%;padding:5px;box-shadow:0 4px 10px -3px rgba(12,45,70,.5);
}
.timer{
 display:inline-flex;align-items:center;gap:7px;
 background:linear-gradient(135deg,var(--h-navy),var(--h-navy2));color:#fff;border-radius:999px;
 padding:7px 16px;font-weight:800;font-size:15px;font-variant-numeric:tabular-nums;
 letter-spacing:.5px;box-shadow:0 6px 16px -6px rgba(12,45,70,.5),0 0 0 3px rgba(20,184,166,.10);
 animation:timerGlow 3.2s ease-in-out infinite;
}
@keyframes timerGlow{0%,100%{box-shadow:0 6px 16px -6px rgba(12,45,70,.5),0 0 0 3px rgba(20,184,166,.08)}50%{box-shadow:0 8px 20px -6px rgba(12,45,70,.6),0 0 0 3px rgba(20,184,166,.16)}}
.progress{
 position:relative;height:9px;border-radius:999px;background:rgba(12,74,94,.07);
 border:1px solid var(--h-border);overflow:hidden;
}
.progress i,#progress{
 display:block;height:100%;width:0;border-radius:999px;
 background:linear-gradient(90deg,var(--h-navy),var(--h-teal));
 transition:width .5s cubic-bezier(.22,.9,.3,1);
 position:relative;
}
.progress i::after,#progress::after{
 content:"";position:absolute;inset:0;
 background:linear-gradient(90deg,transparent,rgba(255,255,255,.55),transparent);
 background-size:60px 100%;animation:shimmer 1.8s linear infinite;
}
@keyframes shimmer{from{background-position:-60px 0}to{background-position:220px 0}}

.panel:nth-child(3){flex:1 1 220px;justify-content:flex-end;gap:8px}
.stats{display:flex;gap:10px;flex-wrap:wrap;width:100%;justify-content:flex-end}
.stats>div{
 display:flex;align-items:center;gap:7px;font-size:13px;font-weight:700;color:var(--h-ink-dim);
 background:rgba(255,255,255,.6);border:1px solid var(--h-border);border-radius:999px;padding:7px 14px;
 box-shadow:0 1px 2px rgba(12,45,70,.05);
 transition:background .18s ease,transform .18s ease,box-shadow .18s ease;
}
.stats>div:hover{background:#fff;transform:translateY(-1px);box-shadow:0 6px 14px -6px rgba(12,45,70,.18)}
.stats b{font-size:14px;font-weight:900}
.stats b.good{color:var(--good)}
.stats b.bad{color:var(--bad)}
.stats svg{flex:none;border-radius:50%;padding:3px}
.stats>div:nth-child(1) svg{background:rgba(31,174,99,.12)}
.stats>div:nth-child(2) svg{background:rgba(224,72,63,.12)}

@media(min-width:641px){
 .panel:not(:first-child):before{
  content:"";position:absolute;left:-7px;top:8px;bottom:8px;width:1px;
  background:linear-gradient(180deg,transparent,rgba(12,74,94,.2),transparent);
 }
}
@media(max-width:640px){
 .top{padding:14px 16px;gap:12px}
 .panel.logo span{display:none}
 .panel:nth-child(3){justify-content:flex-start}
 .stats{justify-content:flex-start}
}

/* ============================= CATEGORY HERO (new) ============================= */
.catHero{
 position:relative;overflow:hidden;
 background:var(--h-glass,rgba(255,255,255,.76));border:1px solid rgba(255,255,255,.8);border-radius:24px;
 padding:22px 26px;box-shadow:0 18px 40px -18px rgba(12,45,70,.20),0 4px 14px -6px rgba(12,45,70,.12);
 backdrop-filter:blur(18px) saturate(160%);-webkit-backdrop-filter:blur(18px) saturate(160%);
}
.catHero .backLink{
 display:inline-flex;align-items:center;gap:6px;font-size:13px;font-weight:700;
 color:var(--ink-dim);text-decoration:none;margin-bottom:10px;
 transition:color .15s ease;
}
.catHero .backLink:hover{color:var(--blue2)}
.catHero h1{margin:0 0 8px;font-size:clamp(20px,3vw,28px);font-weight:900;letter-spacing:-.3px;color:#16283a}
.catHero p{margin:0 0 14px;font-size:14.5px;line-height:1.6;color:var(--ink-dim);max-width:640px}
.catHero .catMeta{display:flex;flex-wrap:wrap;gap:10px}
.catHero .catMeta span{
 display:inline-flex;align-items:center;gap:6px;font-size:13px;font-weight:800;
 background:rgba(124,140,250,.12);color:var(--blue2);border-radius:999px;padding:6px 14px;
}
.catHero .catMeta span.warn{background:rgba(224,72,63,.12);color:var(--bad)}

/* Empty state when a category has zero practice questions available */
.emptyState{
 text-align:center;padding:60px 30px;background:rgba(255,255,255,.88);
 border-radius:28px;border:1px solid rgba(255,255,255,.7);box-shadow:var(--shadow-lg);
}
.emptyState h2{margin:0 0 10px;font-size:20px;font-weight:900;color:var(--ink)}
.emptyState p{margin:0 0 20px;color:var(--ink-dim);font-size:14.5px;line-height:1.6}
.emptyState a{
 display:inline-flex;padding:13px 26px;border-radius:999px;background:var(--accent-grad);
 color:#fff;font-weight:800;text-decoration:none;box-shadow:0 14px 30px -12px rgba(124,140,250,.55);
}

/* ============================= CARD SHELL ============================= */
.card{
 position:relative;overflow:hidden;background:rgba(255,255,255,.88);
 border-radius:28px;border:1px solid rgba(255,255,255,.7);
 box-shadow:var(--shadow-lg);
 backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);
}
.media{position:relative;margin:0 auto;width:100%;background:#100f2c;overflow:hidden}
.media img{display:block;width:100%;height:auto;object-fit:contain}

.media:not(.normalMode):not(.signMode){
 aspect-ratio:1006/632;
 background:linear-gradient(100deg,#241f57 30%,#372c8a 50%,#241f57 70%);
 background-size:220% 100%;animation:skeletonSweep 1.4s ease-in-out infinite;
}
@keyframes skeletonSweep{0%{background-position:120% 0}100%{background-position:-20% 0}}

.media:after{
 content:"#" attr(data-ticket);
 position:absolute;left:14px;top:14px;z-index:30;
 min-width:44px;height:32px;display:inline-flex;align-items:center;justify-content:center;
 padding:0 10px;border-radius:10px;
 background:rgba(30,20,60,.55);backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);
 border:1px solid rgba(255,255,255,.18);
 color:#fff;font-size:14px;font-weight:800;letter-spacing:.3px;
}

.media.normalMode{position:relative;aspect-ratio:1006/632;background:#16123a}
.media.normalMode img{width:100%;height:100%;object-fit:contain;display:block}

.media.normalMode .zone{
 position:absolute;left:0;right:0;bottom:0;
 top:73.3%;
 display:grid;
 grid-template-rows:46.4% 53.6%;
 z-index:15;
 background:var(--navy-rich);
 box-shadow:0 -3px 0 0 #150f3a;
}
.media.normalMode.wideZone .zone{top:36.9%;grid-template-rows:32.2% 67.8%}

.media.normalMode .zone .qOverlay{
 display:flex!important;
 align-items:center;justify-content:center;text-align:center;
 min-height:0;
 overflow:hidden;
 padding:clamp(3px,1.3vw,22px) clamp(8px,3vw,34px);
 background:linear-gradient(180deg,#241f57,#150f3a);
 color:#fff;font-weight:800;
 font-size:clamp(9px,1.9vw,24px);
 line-height:1.18;
 letter-spacing:.1px;
 border-top:1px solid rgba(255,255,255,.14);
 text-shadow:0 1px 2px rgba(0,0,0,.35);
}
.media.normalMode.wideZone .zone .qOverlay{font-size:clamp(11px,2.2vw,26px)}
.media.normalMode.cutoff-2 .zone .qOverlay{font-size:clamp(8px,1.6vw,20px)}
.media.normalMode.cutoff-3 .zone .qOverlay{font-size:clamp(7px,1.3vw,16px);line-height:1.12}

.media.normalMode .zone .answers{
 display:grid;grid-template-columns:repeat(2,1fr);gap:0;
 background:var(--divider);
 min-height:0;
 overflow:hidden;
}
.media.normalMode .zone .answer{
 position:relative;
 display:flex;align-items:center;
 min-height:0;
 padding:clamp(1px,0.7vw,10px) clamp(6px,2vw,26px) clamp(1px,0.7vw,10px) clamp(22px,5.6vw,60px);
 border:0;
 border-right:1px solid var(--divider);border-bottom:1px solid var(--divider);
 border-radius:0;
 background:var(--panel-grad);
 color:#fff;
 font-size:clamp(7.5px,1.35vw,16px);
 line-height:1.14;
 font-weight:700;
 text-align:left;
 cursor:pointer;
 overflow:hidden;
 transition:background .18s ease,filter .18s ease;
}
.media.normalMode .zone .answer:nth-child(2n){border-right:0}
.media.normalMode .zone .answer.full{grid-column:1/-1;border-right:0}
.media.normalMode .zone .answer:not(:disabled):hover{background:var(--panel-grad-hover);filter:brightness(1.05)}
.media.normalMode .zone .answer:not(:disabled):active{filter:brightness(.94)}
.media.normalMode .zone .num{
 position:absolute;left:clamp(2px,0.6vw,5px);top:50%;transform:translateY(-50%);
 width:clamp(13px,3vw,30px);height:clamp(12px,2.6vw,26px);border-radius:6px;
 display:grid;place-items:center;
 background:linear-gradient(180deg,#fff,#ece8fb);color:#4b3fb8;font-size:clamp(8px,1.5vw,17px);font-weight:900;
 box-shadow:0 1px 2px rgba(0,0,0,.25);
}
.media.normalMode .zone .radio{display:none}
.media.normalMode.ansLen-2 .zone .answer{font-size:clamp(7px,1.15vw,13px)}
.media.normalMode.ansLen-3 .zone .answer{font-size:clamp(6.5px,1vw,11px);line-height:1.08;padding-top:1px;padding-bottom:1px}

.noImageQuestion{
 position:relative;
 margin:0;
 padding:40px 36px 34px;
 text-align:center;
 font-size:clamp(18px,2.6vw,25px);
 line-height:1.5;
 font-weight:800;
 letter-spacing:.1px;
 color:#fff;
 background:var(--navy-rich);
 animation:fadeSlide .38s ease both;
}
.noImageQuestion:before{
 content:"";position:absolute;left:50%;top:16px;transform:translateX(-50%);
 width:44px;height:4px;border-radius:999px;background:var(--accent-grad);
}
.content{padding:0 0 6px;background:#fff}
.content .answers{
 display:grid;grid-template-columns:repeat(2,1fr);
 gap:12px;
 padding:24px 26px 4px;
}
.content .answers .answer{
 position:relative;
 display:flex;align-items:center;gap:10px;
 min-height:74px;
 padding:16px 44px 16px 68px;
 border-radius:14px;
 background:var(--panel-grad);
 border:1px solid rgba(255,255,255,.10);
 color:#fff;
 font-size:15.5px;
 line-height:1.35;
 font-weight:700;
 text-align:left;
 cursor:pointer;
 box-shadow:0 1px 2px rgba(76,60,150,.14);
 transition:transform .18s cubic-bezier(.22,.9,.3,1),box-shadow .18s ease,background .18s ease;
 animation:fadeSlide .32s ease both;
}
.content .answers .answer.full{grid-column:1/-1}
.content .answers .answer:not(:disabled):hover{
 background:var(--panel-grad-hover);
 transform:translateY(-2px);
 box-shadow:0 10px 24px -10px rgba(107,92,240,.45);
}
.content .answers .answer:not(:disabled):active{transform:translateY(0);filter:brightness(.96)}
.content .answers .answer:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.content .answers .num{
 position:absolute;left:16px;top:50%;transform:translateY(-50%);
 width:34px;height:32px;border-radius:9px;
 display:grid;place-items:center;
 background:linear-gradient(180deg,#fff,#ece8fb);color:#4b3fb8;font-size:16px;font-weight:900;
 box-shadow:0 1px 2px rgba(0,0,0,.2);
}
.content .answers .radio{
 position:absolute;right:16px;top:50%;transform:translateY(-50%);
 width:22px;height:22px;border-radius:50%;
 border:2px solid rgba(255,255,255,.28);
 display:grid;place-items:center;
 font-size:12px;line-height:1;color:transparent;
 transition:border-color .18s ease,background .18s ease;
}
.content .answers .answer.correct .radio{border-color:transparent;background:#fff;color:#15803d}
.content .answers .answer.correct .radio:after{content:"✓";font-weight:900}
.content .answers .answer.wrong .radio{border-color:transparent;background:#fff;color:#b91c1c}
.content .answers .answer.wrong .radio:after{content:"✕";font-weight:900}

@keyframes fadeSlide{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}
.content .answers .answer:nth-child(1){animation-delay:.02s}
.content .answers .answer:nth-child(2){animation-delay:.06s}
.content .answers .answer:nth-child(3){animation-delay:.1s}
.content .answers .answer:nth-child(4){animation-delay:.14s}

@media(max-width:520px){
 .content .answers{grid-template-columns:1fr;gap:10px;padding:18px 16px 0}
 .content .answers .answer{min-height:60px;font-size:14.5px;padding:12px 40px 12px 54px}
 .content .answers .num{left:12px;width:30px;height:26px;font-size:15px}
 .content .answers .radio{right:12px;width:19px;height:19px}
 .noImageQuestion{padding:32px 22px 26px}
}

.media.signMode{
 position:relative;
 aspect-ratio:1006/632;
 max-width:1040px;
 background:#16123a;
}
.media.signMode img{width:100%;height:100%;object-fit:contain;display:block}

.media.signMode .zone{
 position:absolute;left:0;right:0;bottom:0;
 top:71.2%;
 display:grid;
 grid-template-rows:44% 56%;
 z-index:15;
 background:var(--navy-rich);
 box-shadow:0 -3px 0 0 #150f3a;
}

.media.signMode .zone .qOverlay{
 display:flex!important;
 align-items:center;justify-content:center;text-align:center;
 min-height:0;
 overflow:hidden;
 padding:clamp(4px,1.6vw,20px) clamp(10px,3vw,28px);
 background:rgba(24,18,58,.94);
 border-top:1px solid rgba(255,255,255,.14);
 color:#fff;font-weight:800;
 font-size:clamp(9px,1.9vw,22px);
 line-height:1.2;
 text-shadow:0 1px 2px rgba(0,0,0,.35);
}
.media.signMode.qLen-2 .zone .qOverlay{font-size:clamp(8px,1.5vw,17px)}
.media.signMode.qLen-3 .zone .qOverlay{font-size:clamp(7px,1.2vw,14px);line-height:1.14}

.media.signMode .zone .answers{
 display:grid;grid-template-columns:repeat(2,1fr);
 gap:clamp(2px,0.8vw,10px);
 padding:clamp(2px,0.8vw,10px);
 min-height:0;
 overflow:hidden;
}
.media.signMode .zone .answer{
 position:relative;
 display:flex;align-items:center;
 min-height:0;
 padding:clamp(2px,0.9vw,12px) clamp(8px,2.2vw,22px) clamp(2px,0.9vw,12px) clamp(24px,5.6vw,54px);
 border-radius:clamp(2px,0.6vw,8px);
 background:var(--panel-grad);
 border:1px solid rgba(255,255,255,.10);
 color:#fff;
 font-size:clamp(7.5px,1.3vw,15px);
 line-height:1.16;
 font-weight:700;
 text-align:left;
 cursor:pointer;
 overflow:hidden;
 transition:background .18s ease,filter .18s ease;
}
.media.signMode .zone .answer.full{grid-column:1/-1}
.media.signMode .zone .answer:not(:disabled):hover{background:var(--panel-grad-hover);filter:brightness(1.05)}
.media.signMode .zone .answer:not(:disabled):active{filter:brightness(.94)}
.media.signMode .zone .num{
 position:absolute;left:clamp(2px,0.6vw,6px);top:50%;transform:translateY(-50%);
 width:clamp(13px,2.8vw,28px);height:clamp(12px,2.5vw,25px);border-radius:6px;
 display:grid;place-items:center;
 background:linear-gradient(180deg,#fff,#ece8fb);color:#4b3fb8;font-size:clamp(8px,1.4vw,16px);font-weight:900;
 box-shadow:0 1px 2px rgba(0,0,0,.25);
}
.media.signMode .zone .radio{display:none}
.media.signMode.ansLen-2 .zone .answer{font-size:clamp(7px,1.1vw,13px)}
.media.signMode.ansLen-3 .zone .answer{font-size:clamp(6.5px,0.95vw,11px);line-height:1.1}

.media.signMode.wideZone .zone{top:36.9%;grid-template-rows:32.2% 67.8%}

.answer.correct{background:linear-gradient(135deg,#22c55e,#15803d)!important;box-shadow:0 0 0 1px rgba(255,255,255,.2) inset,0 6px 16px -6px rgba(21,128,61,.5)!important}
.answer.wrong{background:linear-gradient(135deg,#f43f5e,#be123c)!important;box-shadow:0 0 0 1px rgba(255,255,255,.2) inset,0 6px 16px -6px rgba(190,18,60,.5)!important}
.answer:disabled{cursor:default}

.next{
 display:flex;align-items:center;justify-content:center;gap:8px;
 margin:24px auto;
 min-width:280px;
 padding:16px 32px;
 border-radius:999px;
 background:var(--accent-grad);
 color:#fff;
 border:0;
 font-size:17px;
 font-weight:800;
 letter-spacing:.2px;
 cursor:pointer;
 box-shadow:0 14px 30px -12px rgba(124,140,250,.55);
 transition:transform .16s cubic-bezier(.22,.9,.3,1),box-shadow .16s ease,filter .16s ease;
}
.next:hover{transform:translateY(-2px);box-shadow:0 18px 36px -12px rgba(124,140,250,.65);filter:brightness(1.04)}
.next:active{transform:translateY(0);filter:brightness(.96)}
.next:focus-visible{outline:2px solid var(--blue);outline-offset:3px}

.modal{position:fixed;inset:0;display:none;align-items:center;justify-content:center;background:rgba(30,20,55,.45);backdrop-filter:blur(5px);-webkit-backdrop-filter:blur(5px);z-index:9999;padding:22px}
.modal.show{display:flex}
.box{
 width:min(440px,100%);background:#fff;border-radius:26px;
 padding:36px 32px 30px;color:var(--ink);text-align:center;
 box-shadow:0 30px 70px -20px rgba(76,60,150,.35);
 animation:fadeSlide .32s cubic-bezier(.22,.9,.3,1) both;
}
.box .resultIcon{
 width:64px;height:64px;margin:0 auto 18px;border-radius:50%;
 display:grid;place-items:center;background:var(--accent-grad);color:#fff;
 box-shadow:0 10px 24px -8px rgba(124,140,250,.55);
}
.box h2{margin:0 0 10px;font-size:22px;font-weight:900;letter-spacing:-.2px}
.box p{line-height:1.7;color:var(--ink-dim);font-size:14.5px;margin:0 0 24px}
.box button{width:100%;padding:15px;border:0;border-radius:999px;background:linear-gradient(135deg,#6d5cf0,#8b5cf6);color:#fff;font-weight:800;font-size:15.5px;cursor:pointer;transition:filter .16s ease,transform .16s ease}
.box button:hover{filter:brightness(1.15)}
.box button:active{transform:scale(.98)}
.box a.backBtn{
 display:block;margin-top:10px;color:var(--ink-dim);font-size:13.5px;font-weight:700;text-decoration:none;
}
.box a.backBtn:hover{color:var(--blue2)}

/* ============================= WRONG-ANSWER EXPLANATION POPUP ============================= */
#resultModal{z-index:10000}
.explainBox{
 position:relative;text-align:left;padding:34px 30px 26px;
 animation:explainIn .28s cubic-bezier(.22,.9,.3,1) both;
}
@keyframes explainIn{from{opacity:0;transform:scale(.94) translateY(6px)}to{opacity:1;transform:scale(1) translateY(0)}}
.explainBox .explainClose{
 position:absolute;top:14px;right:14px;
 width:36px;height:36px;border-radius:50%;border:0;
 background:#f3f1fb;color:var(--ink-dim);
 display:grid;place-items:center;font-size:16px;line-height:1;cursor:pointer;
 transition:background .15s ease,color .15s ease,transform .15s ease;
}
.explainBox .explainClose:hover{background:#e9e4fa;color:var(--ink)}
.explainBox .explainClose:active{transform:scale(.92)}
.explainBox .explainIcon{
 width:52px;height:52px;margin:0 0 16px;border-radius:16px;
 display:grid;place-items:center;color:#fff;font-weight:900;font-size:22px;
 background:linear-gradient(135deg,#fb7185,#be123c);
 box-shadow:0 10px 22px -8px rgba(190,18,60,.5);
}
.explainBox h3{margin:0 0 10px;font-size:19px;font-weight:900;letter-spacing:-.1px;color:var(--ink)}
.explainBox p{margin:0 0 22px;font-size:15px;line-height:1.65;color:#4a4468;text-align:left}
.explainBox button.explainContinue{
 width:100%;padding:13px;border:0;border-radius:999px;cursor:pointer;
 background:#f3f1fb;color:var(--ink);font-weight:700;font-size:14.5px;
 transition:background .15s ease;
}
.explainBox button.explainContinue:hover{background:#e9e4fa}
@media(max-width:520px){
 .explainBox{padding:28px 20px 22px}
}

@media(max-width:820px){
 .media.signMode{max-width:100%}
}
@media(max-width:600px){
 .wrap{padding:16px 10px 40px}
 .card{border-radius:20px}
 .top{border-radius:18px}
}
@media(prefers-reduced-motion:reduce){
 *,*:before,*:after{animation:none!important;transition:none!important}
}

/* ============================= HUB PAGE (categories.html, new) ============================= */
.hubIntro{
 background:var(--h-glass,rgba(255,255,255,.76));border:1px solid rgba(255,255,255,.8);border-radius:24px;
 padding:26px;box-shadow:0 18px 40px -18px rgba(12,45,70,.20),0 4px 14px -6px rgba(12,45,70,.12);
 backdrop-filter:blur(18px) saturate(160%);-webkit-backdrop-filter:blur(18px) saturate(160%);
}
.hubIntro h1{margin:0 0 8px;font-size:clamp(22px,3.4vw,30px);font-weight:900;letter-spacing:-.3px;color:#16283a}
.hubIntro p{margin:0;font-size:14.5px;line-height:1.6;color:var(--ink-dim);max-width:680px}
.hubIntro .mainLinks{display:flex;gap:10px;flex-wrap:wrap;margin-top:16px}
.hubIntro .mainLinks a{
 display:inline-flex;align-items:center;gap:6px;font-size:13.5px;font-weight:800;
 background:rgba(124,140,250,.12);color:var(--blue2);border-radius:999px;padding:8px 16px;
 text-decoration:none;transition:background .15s ease;
}
.hubIntro .mainLinks a:hover{background:rgba(124,140,250,.22)}

.catGrid{
 display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px;
}
.catCard{
 display:flex;flex-direction:column;gap:10px;
 background:rgba(255,255,255,.88);border:1px solid rgba(255,255,255,.7);border-radius:20px;
 padding:20px 22px;box-shadow:var(--shadow-sm);text-decoration:none;color:var(--ink);
 transition:transform .18s cubic-bezier(.22,.9,.3,1),box-shadow .18s ease;
}
.catCard:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg)}
.catCard .catCode{
 align-self:flex-start;font-size:12px;font-weight:900;letter-spacing:.4px;color:#fff;
 background:var(--accent-grad);border-radius:999px;padding:4px 12px;
}
.catCard h3{margin:0;font-size:16.5px;font-weight:800;color:#16283a}
.catCard p{margin:0;font-size:13px;line-height:1.55;color:var(--ink-dim);flex:1}
.catCard .catCount{font-size:13px;font-weight:800;color:var(--blue2)}
.catCard .catCount.warn{color:var(--bad)}