html{scroll-behavior:smooth}
.bg-top,.bg-hero,.bg-sec{font-family:'Fredoka',system-ui,sans-serif;color:#2a1536;box-sizing:border-box}
.bg-top *,.bg-sec *{box-sizing:border-box}
.bg-sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
/* header + hero */
.bg-top{display:flex;align-items:center;gap:18px;padding:10px 18px;background:linear-gradient(90deg,#8b3fc4,#19d3e8);z-index:50}
.bg-all .bg-top{position:sticky;top:0}
.bg-logo{display:flex;align-items:center;flex:none;text-decoration:none;color:#fff!important;font-size:26px;font-weight:700;text-shadow:0 2px 0 rgba(0,0,0,.2)}
.bg-logo em{font-style:normal;background:#fff;color:#8b3fc4;border-radius:10px;padding:0 9px;margin-left:5px;text-shadow:none}
.bg-hero{position:relative;line-height:0;background:#8b3fc4}
.bg-hero img{width:100%;height:auto;display:block}
/* sections */
.bg-sec{padding:56px 16px 64px;scroll-margin-top:64px}
.bg-wrap{max-width:1100px;margin:0 auto}
.bg-sec h2.bg-h{display:inline-flex;align-items:center;gap:12px;margin:0 0 26px;padding:12px 26px;border-radius:18px;color:#fff!important;font-family:inherit;font-size:clamp(24px,4vw,36px);font-weight:700;line-height:1.1;text-shadow:0 2px 0 rgba(0,0,0,.2)}
.bg-teal{background:#e8fbfd}.bg-teal h2.bg-h{background:#1bb8c4;box-shadow:0 6px 0 #0e8f9b}
.bg-purple{background:#f5e9f8}.bg-purple h2.bg-h{background:#9b4aae;box-shadow:0 6px 0 #6f2f82}
.bg-grid{display:grid;grid-template-columns:1fr 1fr;gap:26px;align-items:start}
.bg-full{grid-template-columns:1fr}
@media(max-width:820px){.bg-grid{grid-template-columns:1fr}}
.bg-txt{font-size:17px;line-height:1.65}.bg-txt p{margin:0 0 14px}.bg-txt ul{margin:0 0 14px;padding-left:22px}.bg-txt li{margin-bottom:6px}
.bg-wide{max-width:760px}
.bg-btn,.bg-sec button{display:inline-block;border:0;border-radius:12px;padding:10px 16px;font:600 15px/1.2 'Fredoka',system-ui,sans-serif;color:#fff!important;text-decoration:none;cursor:pointer}
.bg-teal .bg-btn,.bg-teal button{background:#9b4aae;box-shadow:0 4px 0 #6f2f82}
.bg-purple .bg-btn,.bg-purple button{background:#1bb8c4;box-shadow:0 4px 0 #0e8f9b}
.bg-btn:active,.bg-sec button:active{transform:translateY(3px);box-shadow:none}
.bg-sec button:disabled{opacity:.5}
/* tool box */
.bg-tool{background:#fff;border-radius:22px;padding:20px;border:3px dashed}
.bg-teal .bg-tool{border-color:#1bb8c4}.bg-purple .bg-tool{border-color:#9b4aae}
.bg-tl{font-weight:700;font-size:18px;margin-bottom:14px}
.bg-tool label{display:block;font-weight:600;font-size:14px;margin:4px 0}
.bg-tool input,.bg-tool select,.bg-tool textarea{width:100%;padding:10px 12px;margin:0 0 10px;border:2px solid #d9c3e0;border-radius:12px;font:inherit;color:#2a1536;background:#fff}
.bg-two{display:grid;grid-template-columns:1fr 1fr;gap:0 10px}
.bg-btns{display:flex;flex-wrap:wrap;gap:10px;margin:4px 0 10px}
.bg-out{margin-top:8px;padding:12px 14px;background:#f3eef7;border-radius:12px;line-height:1.5;font-size:15px}
.bg-out ol{margin:6px 0 0;padding-left:20px}.bg-out input{margin-top:8px}
/* about menu */
.bg-tap{font-weight:600;margin:22px 0 12px}
.bg-menu{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:14px}
.bg-mi{display:flex;flex-direction:column;align-items:center;gap:6px;padding:18px 10px;background:#fff;border-radius:18px;text-decoration:none;color:#2a1536!important;font-weight:600;text-align:center;border-bottom:6px solid #1bb8c4;transition:transform .15s}
.bg-mi:nth-child(even){border-color:#9b4aae}
.bg-mi b{font-size:34px;line-height:1}
.bg-mi:hover{transform:translateY(-4px)}
/* games */
.bg-tabs{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:14px}
.bg-tabs button{opacity:.6}.bg-tabs button.on{opacity:1;outline:3px solid #2a1536}
.bg-stage{background:#f3eef7;border-radius:16px;padding:16px;min-height:200px;text-align:center}
.bg-msg{font-size:18px;font-weight:600;margin:12px 0}
.bg-hud{display:flex;justify-content:space-between;gap:8px;background:#2a1536;color:#fff;font-weight:700;border-radius:12px;padding:8px 14px}
.bg-q{font-size:21px;font-weight:600;margin:14px 0}
.bg-ans{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.bg-sec .bg-a{padding:16px 10px;font-size:16px;box-shadow:none}
.bg-a.a0{background:#e24b5b}.bg-a.a1{background:#1bb8c4}.bg-a.a2{background:#e0a410}.bg-a.a3{background:#9b4aae}
.bg-a.ok{outline:4px solid #22c55e}.bg-a.no{opacity:.4}
.bg-ch{display:flex;justify-content:center;gap:14px}.bg-sec .bg-ch button{font-size:44px;padding:12px 18px}
.bg-lane{display:grid;grid-template-columns:repeat(6,1fr) 1.3fr;gap:4px;margin:12px 0}
.bg-lane i{height:46px;background:#fff;border:2px solid #d9c3e0;border-radius:8px;font-style:normal;font-size:24px;line-height:42px}
.bg-lane b{background:#1bb8c4;border-radius:8px;font-size:26px;line-height:46px}
.bg-end{font-size:20px;font-weight:600;padding:20px 0;line-height:2}
/* guidelines picture */
.bg-gd{background:linear-gradient(135deg,#19d3e8,#8b3fc4)}
.bg-gd h2.bg-h{background:#fff;color:#8b3fc4!important;text-shadow:none;box-shadow:0 6px 0 rgba(0,0,0,.25)}
.bg-board{position:relative;container-type:inline-size;max-width:900px;margin:0 auto;border-radius:22px;overflow:hidden;line-height:1.25;box-shadow:0 10px 0 rgba(0,0,0,.2)}
.bg-board img{width:100%;height:auto;display:block}
.bg-bt{position:absolute;left:6%;right:6%;top:54%;bottom:3%;display:flex;flex-direction:column;justify-content:center;color:#2a1536}
.bg-bt h3{margin:0 0 1.2cqw;font:700 clamp(12px,3.6cqw,30px)/1.1 'Fredoka',system-ui,sans-serif;color:#8b3fc4}
.bg-bt ul{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:1fr 1fr;gap:1.2cqw 3cqw}
.bg-bt li{font:500 clamp(9px,2.3cqw,19px)/1.2 'Fredoka',system-ui,sans-serif;padding-left:2.6cqw;position:relative}
.bg-bt li:before{content:"✔";position:absolute;left:0;color:#1bb8c4;font-weight:700}
/* faq */
.bg-faq{background:linear-gradient(160deg,#2a1048,#5b2a86)}
.bg-faq h2.bg-h{background:#1bb8c4;box-shadow:0 6px 0 #0e8f9b}
.bg-fl{max-width:820px;display:grid;gap:12px}
.bg-fl details{background:rgba(255,255,255,.09);border-left:6px solid #19d3e8;border-radius:14px;padding:14px 18px;color:#fff}
.bg-fl details[open]{background:rgba(255,255,255,.16);border-left-color:#e0a410}
.bg-fl summary{cursor:pointer;font-weight:600;font-size:18px;list-style:none;display:flex;justify-content:space-between;gap:12px}
.bg-fl summary::-webkit-details-marker{display:none}
.bg-fl summary:after{content:"+";font-size:24px;line-height:1;color:#19d3e8}
.bg-fl details[open] summary:after{content:"−"}
.bg-fl p{margin:10px 0 0;line-height:1.6;color:#efe6f7;font-size:16px}
@media(max-width:520px){.bg-logo{font-size:20px}.bg-ans{grid-template-columns:1fr}.bg-two{grid-template-columns:1fr}.bg-sec{padding:40px 12px 48px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.bg-mi{transition:none}}
/* v1.1 additions */
.bg-acts{display:flex;gap:10px;margin-left:auto;flex:none}
.bg-top a.bg-lb,.bg-top a.bg-sb{display:inline-block;text-decoration:none;font-weight:700;font-size:15px;line-height:1.2;padding:9px 18px;border-radius:12px;box-shadow:0 4px 0 rgba(0,0,0,.25)}
.bg-top a.bg-lb{background:#fff;color:#8b3fc4!important}
.bg-top a.bg-sb{background:#2a1536;color:#fff!important}
.bg-top a.bg-lb:active,.bg-top a.bg-sb:active{transform:translateY(3px);box-shadow:none}
.bg-txt h3{margin:18px 0 8px;font-size:20px;font-weight:700;line-height:1.2;color:#0b6f79}
.bg-purple .bg-txt h3{color:#6f2f82}
.bg-txt ol{margin:0 0 14px;padding-left:22px}
.bg-lk{display:flex;flex-wrap:wrap;gap:10px}
.bg-sec h3.bg-h3{margin:34px 0 4px;font-size:22px;font-weight:700;color:#0b6f79}
.bg-exs{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:12px}
.bg-ex{display:flex;flex-direction:column;gap:4px;padding:14px 16px;background:#fff;border-radius:16px;text-decoration:none;color:#2a1536!important;border-left:6px solid #9b4aae;line-height:1.35}
.bg-ex b{font-size:17px}.bg-ex span{font-size:14px}
.bg-ex:hover{background:#fdf7ff}
.bg-keys{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin-bottom:14px}
.bg-sec .bg-keys button{padding:12px 0;font-size:19px}
.bg-tool input.cd{font-size:24px;text-align:right;font-weight:600}
.bg-abs{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px;margin-top:26px}
.bg-ab{background:#fff;border-radius:20px;padding:20px;border-bottom:6px solid #1bb8c4}
.bg-ab:nth-child(2){border-color:#9b4aae}
.bg-ab b{font-size:34px;line-height:1}
.bg-ab h3{margin:10px 0 6px;font-size:20px;color:#2a1536}
.bg-ab p{margin:0;line-height:1.55;font-size:15.5px}
@media(max-width:520px){.bg-top a.bg-lb,.bg-top a.bg-sb{padding:8px 12px;font-size:14px}.bg-acts{gap:8px}}