:root{--navy:#12355b;--navy-2:#0b2545;--teal:#078084;--cyan:#0ea5b7;--blue:#2563eb;--yellow:#fbbf24;--orange:#f97316;--purple:#7c3aed;--ink:#10233f;--muted:#607087;--paper:#f5f8fb;--card:#fff;--line:#dce6ef;--shadow:0 18px 50px rgba(15,35,65,.12);--radius:24px}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:92px}
body{margin:0;background:var(--paper);color:var(--ink);font-family:"Nunito","Segoe UI",sans-serif;font-weight:600;overflow-x:hidden}
button,input,select{font:inherit}
button,a{touch-action:manipulation}
a{color:inherit;text-decoration:none}
button{cursor:pointer}
[hidden]{display:none!important}
.skip-link{position:fixed;left:12px;top:-80px;z-index:9999;background:#fff;padding:12px 16px;border-radius:10px;box-shadow:var(--shadow)}.skip-link:focus{top:12px}
.site-header{height:80px;display:flex;align-items:center;gap:28px;padding:0 clamp(18px,4vw,64px);background:linear-gradient(105deg,var(--navy-2),#10445b 60%,#11647a);color:#fff;position:sticky;top:0;z-index:1000;box-shadow:0 8px 28px rgba(6,27,52,.18)}
.brand{display:flex;align-items:center;gap:12px;min-width:210px}.brand img{width:48px;height:48px;border-radius:50%;object-fit:cover;border:3px solid rgba(255,255,255,.18)}.brand span{display:grid}.brand strong{font-size:1.35rem;line-height:1}.brand small{font-size:.72rem;color:#c7eaf1;margin-top:5px}
.top-nav{display:flex;align-items:center;justify-content:center;gap:26px;margin:auto}.top-nav a{font-size:.86rem;font-weight:900;color:#d9edf3;position:relative}.top-nav a:after{content:"";position:absolute;left:0;right:100%;bottom:-7px;height:2px;background:var(--yellow);transition:.2s}.top-nav a:hover:after{right:0}
.header-actions{display:flex;align-items:center;gap:8px}.header-grade-picker{position:relative}.header-grade-switch{height:48px;min-width:142px;padding:0 30px 0 11px;border:1px solid rgba(255,255,255,.22);border-radius:15px;background:rgba(255,255,255,.1);display:flex;align-items:center;gap:7px;color:#fff;font-size:.73rem;font-weight:1000}.header-grade-switch>i:first-child{color:#ffe083;font-size:1.05rem}.header-grade-switch[aria-expanded="true"]{background:#fff;color:var(--navy)}.header-grade-switch[aria-expanded="true"]>i:first-child{color:#d89400}.header-grade-arrow{position:absolute;right:8px;color:#bcdce5}.header-grade-switch[aria-expanded="true"] .header-grade-arrow{color:#607087;transform:rotate(180deg)}.header-grade-menu{position:absolute;right:0;top:calc(100% + 9px);width:250px;padding:9px;border:1px solid var(--line);border-radius:18px;background:#fff;color:var(--ink);box-shadow:0 22px 55px rgba(5,25,50,.25);z-index:1200}.grade-menu-title{display:block;padding:8px 10px 10px;color:var(--teal);font-size:.62rem;font-weight:1000;letter-spacing:.08em}.grade-menu-title small{display:block;margin-top:3px;color:var(--muted);font-size:.62rem;letter-spacing:0}.header-grade-menu button{width:100%;min-height:49px;padding:7px 10px;border:0;border-radius:11px;background:#fff;color:var(--ink);display:grid;text-align:left}.header-grade-menu button:hover,.header-grade-menu button.active{background:#edf8f6;color:#086c6c}.header-grade-menu b{font-family:"Nunito","Segoe UI",sans-serif;font-size:.78rem}.header-grade-menu small{margin-top:2px;color:var(--muted);font-family:"Nunito","Segoe UI",sans-serif;font-size:.61rem}.button{border:0;border-radius:15px;min-height:48px;padding:11px 18px;font-weight:900;display:inline-flex;align-items:center;justify-content:center;gap:8px;transition:transform .18s,box-shadow .18s,background .18s}.button:hover{transform:translateY(-2px)}.button small{font-size:.72rem;opacity:.72}.button-primary{background:linear-gradient(135deg,var(--yellow),#ffd85a);color:#492f00;box-shadow:0 12px 28px rgba(251,191,36,.25)}.button-light{background:#fff;color:var(--navy);box-shadow:0 10px 26px rgba(15,35,65,.14)}.button-ghost{background:rgba(255,255,255,.1);color:#fff;border:1px solid rgba(255,255,255,.2)}.button-class{background:linear-gradient(135deg,var(--teal),#0ea5a1);color:#fff}.button-warning{background:#fff7d6;color:#855500;border:1px solid #f9d96a}.button.full{width:100%}.icon-button{width:46px;height:46px;border:1px solid var(--line);border-radius:14px;background:#fff;color:var(--navy);font-size:1.25rem}.player-mini{min-height:48px;border:1px solid rgba(167,255,221,.38);background:rgba(255,255,255,.13);color:#fff;border-radius:15px;padding:6px 10px;display:flex;align-items:center;gap:8px;box-shadow:inset 0 0 0 1px rgba(255,255,255,.03)}.header-avatar{width:32px;height:32px;border-radius:10px;background:rgba(255,255,255,.15);display:grid;place-items:center;font-size:1.25rem;position:relative}.header-avatar:after{content:"";position:absolute;right:-2px;bottom:-2px;width:8px;height:8px;border-radius:50%;background:#39e397;border:2px solid #14536a}.player-mini-copy{display:grid;text-align:left;line-height:1.05}.player-mini-copy b{max-width:115px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:.77rem}.player-mini-copy small{margin-top:4px;color:#aef0d1;font-size:.55rem;font-weight:900}.player-mini-arrow{color:#bcdce5}
main{width:min(1500px,100%);margin:0 auto}
.hero{margin:26px clamp(14px,2.7vw,40px) 22px;min-height:560px;border-radius:32px;padding:clamp(28px,5vw,70px);display:grid;grid-template-columns:minmax(0,1.2fr) minmax(330px,.8fr);align-items:center;gap:clamp(28px,5vw,70px);position:relative;overflow:hidden;background:radial-gradient(circle at 92% 8%,rgba(255,255,255,.16) 0 10%,transparent 10.3%),radial-gradient(circle at 82% 100%,rgba(14,165,183,.3),transparent 33%),linear-gradient(125deg,#102d54 0%,#0c6173 56%,#0f8b8d 100%);color:#fff;box-shadow:0 24px 65px rgba(11,37,69,.22)}
.hero:before{content:"";position:absolute;width:310px;height:310px;border:70px solid rgba(255,255,255,.05);border-radius:50%;left:-170px;bottom:-190px}.hero-copy,.hero-board{position:relative;z-index:1}.eyebrow{display:flex;align-items:center;gap:10px}.eyebrow span,.section-kicker{font-size:.7rem;font-weight:1000;letter-spacing:.105em}.eyebrow b{background:#c7ffdf;color:#07663d;padding:5px 9px;border-radius:999px;font-size:.65rem}.hero h1{font-size:clamp(2.65rem,6vw,5.2rem);line-height:.96;letter-spacing:-.055em;margin:18px 0 20px;max-width:780px}.hero h1 em{font-style:normal;color:#ffe081}.lead-en{font-size:clamp(1.05rem,2vw,1.28rem);line-height:1.5;margin:0;max-width:700px;color:#e4f4f7}.lead-tr{font-size:.92rem;line-height:1.5;color:#bcdbe3;margin:7px 0 0;max-width:700px}.hero-actions{display:flex;flex-wrap:wrap;gap:11px;margin-top:26px}.hero-points{display:flex;flex-wrap:wrap;gap:14px;margin-top:24px;color:#d4edf2;font-size:.8rem}.hero-points span{display:flex;gap:6px;align-items:center}.hero-points i{color:#9ff5c9}
.hero-board{background:rgba(255,255,255,.95);color:var(--ink);border-radius:28px;padding:22px;box-shadow:0 26px 55px rgba(4,22,45,.28);transform:rotate(1deg)}.hero-board-head{display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line);padding-bottom:14px}.hero-board-head span{font-weight:1000}.hero-board-head small{color:var(--muted)}.podium{height:260px;display:flex;align-items:flex-end;justify-content:center;gap:10px;padding:22px 0 0}.podium-player{width:31%;min-width:0;text-align:center;display:flex;flex-direction:column;align-items:center;position:relative;padding:0 6px 16px;border-radius:18px 18px 10px 10px;background:#e7eef6}.podium-player.first{height:215px;background:linear-gradient(#fff8d6,#f9d968)}.podium-player.second{height:180px}.podium-player.third{height:155px;background:linear-gradient(#fff1df,#ffb56e)}.podium-avatar{font-size:2.25rem;width:62px;height:62px;border-radius:50%;background:#fff;display:grid;place-items:center;margin-top:-30px;box-shadow:0 8px 20px rgba(15,35,65,.13)}.podium-player b{font-size:.84rem;margin-top:10px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:100%}.podium-player small{color:var(--muted);font-size:.68rem}.podium-player i{position:absolute;bottom:12px;font-style:normal;font-size:1.55rem;font-weight:1000;opacity:.35}.hero-live{display:grid;grid-template-columns:auto 1fr;column-gap:8px;align-items:center;background:#effaf7;border:1px solid #cceee4;border-radius:13px;padding:11px 12px}.hero-live b{font-size:.78rem}.hero-live small{grid-column:2;color:var(--muted);font-size:.68rem}.live-dot{width:9px;height:9px;border-radius:50%;background:#10b981;box-shadow:0 0 0 5px rgba(16,185,129,.12);grid-row:1/3}
.player-panel{margin:0 clamp(14px,2.7vw,40px) 22px;background:#fff;border:1px solid var(--line);border-radius:24px;padding:18px 20px;display:grid;grid-template-columns:minmax(240px,1fr) auto auto;align-items:center;gap:22px;box-shadow:var(--shadow)}.player-identity{display:flex;align-items:center;gap:13px}.big-avatar{width:58px;height:58px;border-radius:18px;display:grid;place-items:center;background:linear-gradient(135deg,#e0f7fa,#fff4ce);font-size:2rem}.player-identity small,.player-stats small{font-size:.61rem;letter-spacing:.08em;color:var(--muted);font-weight:1000}.player-identity h2{margin:2px 0 0;font-size:1.25rem}.player-identity p{margin:2px 0 0;font-size:.72rem;color:var(--muted)}.player-stats{display:flex;border-left:1px solid var(--line);border-right:1px solid var(--line)}.player-stats div{padding:2px 18px;display:grid;text-align:center}.player-stats b{font-size:1.25rem;color:var(--navy)}.player-actions{display:flex;gap:8px;align-items:center;justify-content:flex-end}
.ad-wrap{margin:22px clamp(14px,2.7vw,40px);min-height:105px;display:flex;flex-direction:column;justify-content:center;text-align:center;color:#91a0b2;font-size:.56rem;letter-spacing:.12em;overflow:hidden}.ad-wrap>span{margin-bottom:6px}.ad-wrap .adsbygoogle{width:100%}
.content-section,.how-section,.faq-section{margin:30px clamp(14px,2.7vw,40px);padding:clamp(22px,3.5vw,42px);background:#fff;border:1px solid var(--line);border-radius:30px;box-shadow:0 12px 35px rgba(15,35,65,.06)}.section-heading{display:flex;justify-content:space-between;gap:20px;align-items:flex-end;margin-bottom:24px}.section-kicker{color:var(--teal)}.section-heading h2{font-size:clamp(1.8rem,3.4vw,2.65rem);letter-spacing:-.04em;line-height:1.04;margin:7px 0}.section-heading p{margin:0;color:var(--muted);font-size:.91rem}.library-count{min-width:100px;text-align:center;border:1px solid var(--line);border-radius:18px;padding:11px 15px;background:#f8fbfd}.library-count b{display:block;color:var(--teal);font-size:1.5rem}.library-count span{font-size:.67rem;color:var(--muted)}
.library-toolbar{display:grid;grid-template-columns:minmax(0,1fr) minmax(240px,340px);gap:14px;align-items:end}.theme-filter-shell{min-width:0}.theme-filter-shell>span{display:block;margin:0 0 7px 3px;color:var(--teal);font-size:.62rem;font-weight:1000;letter-spacing:.09em}.theme-filter{display:flex;gap:7px;overflow-x:auto;padding:1px 2px 4px;scrollbar-width:thin}.theme-filter>small{min-height:42px;display:flex;align-items:center;color:var(--muted);font-size:.72rem}.theme-filter button,.grade-filter button,.type-filter button{flex:0 0 auto;border:1px solid var(--line);background:#f8fafc;color:#43536a;border-radius:999px;padding:9px 13px;font-size:.76rem;font-weight:900}.theme-filter button.active,.grade-filter button.active{background:var(--navy);border-color:var(--navy);color:#fff}.search-box{height:45px;border:1px solid var(--line);border-radius:14px;display:flex;align-items:center;gap:8px;padding:0 13px;background:#f8fafc}.search-box input{width:100%;border:0;outline:0;background:transparent;color:var(--ink);font-size:.82rem}.type-filter{display:flex;gap:7px;overflow:auto;padding:14px 0 3px;scrollbar-width:none}.type-filter::-webkit-scrollbar{display:none}.type-filter button{flex:0 0 auto;background:#fff}.type-filter button.active{background:#e0f7f4;border-color:#78d3c9;color:#066b6c}.grade-points-notice{margin:15px 0 0;padding:11px 13px;border-radius:13px;background:#eff6ff;color:#31547c;font-size:.76rem;display:flex;gap:8px}.activity-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:15px;margin-top:22px}.activity-card{border:1px solid var(--line);border-radius:21px;overflow:hidden;background:#fff;display:flex;flex-direction:column;min-height:286px;transition:transform .2s,box-shadow .2s,border-color .2s}.activity-card:hover{transform:translateY(-4px);box-shadow:0 16px 32px rgba(15,35,65,.11);border-color:#b7cedc}.activity-art{height:120px;position:relative;display:grid;place-items:center;font-size:3rem;background:linear-gradient(135deg,#daf5ef,#e8f0ff)}.activity-card[data-kind="reading"] .activity-art{background:linear-gradient(135deg,#efe7ff,#dbeafe)}.activity-card[data-kind="listening"] .activity-art{background:linear-gradient(135deg,#dff7ff,#dcfce7)}.activity-card[data-kind="grammar"] .activity-art{background:linear-gradient(135deg,#fff1d6,#ffe4e6)}.activity-card[data-kind="games"] .activity-art{background:linear-gradient(135deg,#ffe3f3,#eee2ff)}.source-badge,.xp-badge{position:absolute;top:10px;border-radius:999px;padding:5px 8px;font-size:.58rem;font-weight:1000;letter-spacing:.04em}.source-badge{left:10px;background:rgba(255,255,255,.9);color:var(--navy)}.xp-badge{right:10px;background:#173a62;color:#fff}.activity-body{padding:15px;display:flex;flex-direction:column;flex:1}.activity-type{font-size:.62rem;color:var(--teal);font-weight:1000;text-transform:uppercase;letter-spacing:.07em}.activity-card h3{font-size:.97rem;line-height:1.25;margin:7px 0;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.activity-meta{font-size:.68rem;color:var(--muted);display:flex;align-items:center;gap:6px;margin-bottom:12px}.activity-card .play-button{margin-top:auto;width:100%;min-height:41px;border:0;border-radius:12px;background:var(--navy);color:#fff;font-weight:1000}.activity-card .play-button.completed{background:#e4f7ed;color:#087044}.activity-card.out-of-grade .xp-badge{background:#64748b}.activity-skeleton{height:286px;border-radius:21px;background:linear-gradient(90deg,#edf2f6 25%,#f8fafc 38%,#edf2f6 62%);background-size:400% 100%;animation:shimmer 1.4s infinite}.empty-state{grid-column:1/-1;padding:55px 20px;text-align:center;color:var(--muted)}.empty-state span{font-size:3rem;display:block}.show-more{margin:22px auto 0;background:#eef4f8;color:var(--navy);border:1px solid var(--line)}
@keyframes shimmer{0%{background-position:100% 0}100%{background-position:0 0}}
.class-bridge{margin:30px clamp(14px,2.7vw,40px);padding:28px clamp(22px,4vw,45px);border-radius:28px;background:linear-gradient(110deg,#173b66,#235f83);color:#fff;display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:22px;box-shadow:var(--shadow)}.class-bridge-icon{width:72px;height:72px;border-radius:22px;display:grid;place-items:center;font-size:2.2rem;background:rgba(255,255,255,.12)}.class-bridge .section-kicker{color:#91e8dd}.class-bridge h2{margin:5px 0;font-size:1.65rem}.class-bridge p{margin:0;color:#d5e7ee;font-size:.86rem;max-width:780px}
.leaderboard-section{margin:30px clamp(14px,2.7vw,40px);padding:clamp(24px,4vw,48px);border-radius:32px;background:radial-gradient(circle at 100% 0,rgba(255,255,255,.12),transparent 27%),linear-gradient(135deg,#102e53,#152b5c 48%,#3f2b78);color:#fff;box-shadow:0 20px 55px rgba(17,38,78,.22)}.section-heading.light .section-kicker{color:#a6f4e8}.section-heading.light p{color:#c6d7e7}.week-chip{padding:10px 13px;border:1px solid rgba(255,255,255,.18);background:rgba(255,255,255,.1);border-radius:13px;display:flex;align-items:center;gap:8px;font-size:.75rem}.leaderboard-grades{margin-bottom:18px}.leaderboard-grades button{background:rgba(255,255,255,.1);border-color:rgba(255,255,255,.16);color:#dce9f4}.leaderboard-grades button.active{background:#fff;color:var(--navy);border-color:#fff}.leaderboard-layout{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(280px,.7fr);gap:18px}.leaderboard-list,.score-rules{border:1px solid rgba(255,255,255,.13);background:rgba(255,255,255,.08);border-radius:22px;padding:15px}.leaderboard-row{display:grid;grid-template-columns:44px 1fr auto auto;gap:10px;align-items:center;min-height:55px;padding:8px 10px;border-bottom:1px solid rgba(255,255,255,.09)}.leaderboard-row:last-child{border-bottom:0}.leaderboard-row.me{background:rgba(251,191,36,.16);border-radius:13px;border-bottom:0}.leaderboard-rank{font-size:1rem;font-weight:1000;color:#c8d7e8}.leaderboard-player{display:flex;align-items:center;gap:9px;min-width:0}.leaderboard-player span{width:34px;height:34px;border-radius:11px;background:rgba(255,255,255,.12);display:grid;place-items:center;font-size:1.25rem}.leaderboard-player b{font-size:.85rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.leaderboard-completed{color:#a9bfd3;font-size:.68rem}.leaderboard-points{font-size:.9rem;font-weight:1000;color:#ffe083}.leaderboard-loading{padding:60px 20px;text-align:center;color:#cbd9e7}.score-rules{padding:23px}.score-rules .section-kicker{color:#a6f4e8}.score-rules h3{font-size:1.4rem;margin:8px 0 18px}.rule-row{display:flex;align-items:center;gap:12px;padding:11px 0;border-bottom:1px solid rgba(255,255,255,.1)}.rule-row>b{width:54px;color:#ffdf76;font-size:1.35rem}.rule-row span{font-size:.86rem}.rule-row small{display:block;color:#aebfd1;font-size:.67rem}.score-rules>p{font-size:.73rem;color:#b9c9d8;line-height:1.55;margin:16px 0 0}
.steps-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.steps-grid article{border:1px solid var(--line);border-radius:22px;padding:22px;position:relative;background:#fbfdff}.steps-grid article>i{position:absolute;right:16px;top:13px;font-style:normal;font-size:2.2rem;font-weight:1000;color:#e0e8ef}.steps-grid article>span{font-size:2.3rem}.steps-grid h3{margin:12px 0 6px}.steps-grid p{margin:0;color:var(--muted);font-size:.82rem;line-height:1.5}.steps-grid small{display:block;margin-top:5px;color:#8593a5}
.seo-section{margin:30px clamp(14px,2.7vw,40px);padding:clamp(26px,4vw,48px);display:grid;grid-template-columns:1fr 1fr;gap:34px;background:#eaf5f3;border-radius:30px;border:1px solid #cce8e4}.seo-copy h2{font-size:clamp(1.65rem,3vw,2.35rem);line-height:1.08;letter-spacing:-.035em;margin:9px 0 16px}.seo-copy p{color:#405a62;line-height:1.7;font-size:.88rem}.grade-seo-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.grade-seo-grid article{background:#fff;border:1px solid #d1e8e5;border-radius:18px;padding:17px}.grade-seo-grid b{width:36px;height:36px;border-radius:11px;background:#173b66;color:#fff;display:grid;place-items:center}.grade-seo-grid h3{font-size:.9rem;margin:10px 0 5px}.grade-seo-grid p{margin:0;font-size:.7rem;line-height:1.5;color:var(--muted)}
.faq-list{display:grid;grid-template-columns:1fr 1fr;gap:11px}.faq-list details{border:1px solid var(--line);border-radius:16px;background:#fbfdff;padding:0 15px}.faq-list summary{list-style:none;min-height:63px;display:grid;grid-template-columns:1fr auto;align-items:center;font-weight:900;font-size:.87rem;cursor:pointer}.faq-list summary::-webkit-details-marker{display:none}.faq-list summary small{display:block;color:var(--muted);font-size:.67rem;font-weight:700}.faq-list details[open] summary i{transform:rotate(45deg)}.faq-list details p{margin:-2px 0 15px;color:var(--muted);font-size:.76rem;line-height:1.55}
footer{max-width:1500px;margin:0 auto;padding:34px clamp(18px,4vw,60px) 100px;display:flex;align-items:center;gap:24px;color:var(--muted);font-size:.75rem}.footer-brand{display:flex;align-items:center;gap:10px;color:var(--navy)}.footer-brand img{width:42px;height:42px;border-radius:50%;object-fit:cover}.footer-brand div{display:grid}.footer-brand span{font-size:.62rem;color:var(--muted)}footer>p{margin-right:auto}footer>div:last-child{display:flex;gap:16px;font-weight:900}
.mobile-nav{display:none}
.modal{position:fixed;inset:0;z-index:3000;background:rgba(5,22,44,.72);backdrop-filter:blur(8px);padding:20px;align-items:center;justify-content:center;overflow:auto}.modal:not([hidden]){display:flex}.modal-card{position:relative;width:min(560px,100%);max-height:min(900px,calc(100vh - 40px));overflow:auto;background:#fff;border-radius:26px;padding:27px;box-shadow:0 30px 80px rgba(0,0,0,.3)}.modal-close{position:absolute;right:13px;top:13px;width:39px;height:39px;border:0;border-radius:12px;background:#eef3f7;color:var(--navy);font-size:1.25rem}.modal-head{display:flex;align-items:center;gap:12px;padding-right:35px;margin-bottom:21px}.modal-head>span{width:55px;height:55px;display:grid;place-items:center;border-radius:17px;background:linear-gradient(135deg,#dff8f4,#fff1c8);font-size:1.8rem}.modal-head h2{font-size:1.4rem;margin:0}.modal-head p{color:var(--muted);font-size:.76rem;margin:3px 0 0}.modal-card form{display:grid;gap:12px}.modal-card label{display:grid;gap:5px;font-size:.75rem;font-weight:1000;color:#344860}.modal-card label small,fieldset small{display:block;font-size:.65rem;color:var(--muted);font-weight:700}.modal-card input,.modal-card select{height:47px;width:100%;border:1px solid var(--line);border-radius:13px;padding:0 13px;outline:0;background:#fbfdff;color:var(--ink)}.modal-card input:focus,.modal-card select:focus{border-color:#4fbab8;box-shadow:0 0 0 3px rgba(7,128,132,.1)}fieldset{border:0;padding:0;margin:0}legend{font-size:.75rem;font-weight:1000;color:#344860;margin-bottom:8px}.avatar-picker{display:flex;gap:8px;flex-wrap:wrap}.avatar-picker button{width:48px;height:48px;border-radius:14px;border:2px solid transparent;background:#eef3f8;font-size:1.55rem}.avatar-picker button.selected{border-color:var(--teal);background:#e5f8f5;box-shadow:0 0 0 3px rgba(7,128,132,.1)}.choice-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:5px}.account-choice{min-height:122px;border:1px solid var(--line);border-radius:18px;background:#f8fafc;padding:13px;display:flex;flex-direction:column;align-items:flex-start;text-align:left}.account-choice i{font-size:1.4rem;margin-bottom:7px}.account-choice b{font-size:.85rem}.account-choice span{font-size:.67rem;color:var(--muted)}.account-choice small{font-size:.62rem;color:#8d99a8;margin-top:3px}.account-choice.quick:hover{border-color:#6ccdc4;background:#ecfbf8}.account-choice.protect{background:#fff8db;border-color:#f7db73}.auth-card{width:min(520px,100%)}.auth-tabs{display:grid;grid-template-columns:repeat(3,1fr);gap:6px;background:#edf3f7;border-radius:14px;padding:5px;margin-bottom:18px}.auth-tabs button{min-height:42px;border:0;border-radius:10px;background:transparent;color:#627185;font-size:.7rem;font-weight:1000}.auth-tabs button.active{background:#fff;color:var(--navy);box-shadow:0 4px 12px rgba(15,35,65,.08)}.auth-panel{display:none!important}.auth-panel.active{display:grid!important}.form-note{display:flex;gap:9px;padding:11px;border-radius:13px;background:#eef8ff;color:#365b79;font-size:.7rem;line-height:1.45}.form-note i{font-size:1.1rem}.form-note small{display:block;color:#67839a}.two-cols{display:grid;grid-template-columns:1fr 1fr;gap:10px}.text-button{border:0;background:transparent;color:var(--blue);font-size:.72rem;font-weight:900;padding:8px}.text-button.danger{color:#d73535}.form-status{min-height:20px;margin:12px 0 0;text-align:center;color:#b42318;font-size:.72rem}.manual-card{text-align:center;width:min(410px,100%)}.manual-icon{font-size:3rem}.manual-card h2{margin:8px 0}.manual-card p{color:var(--muted);font-size:.8rem}.manual-countdown{width:76px;height:76px;border-radius:50%;display:grid;place-items:center;margin:18px auto;background:#eef6fb;color:var(--navy);font-size:1.5rem;font-weight:1000}.manual-card .button:disabled{opacity:.45;cursor:not-allowed;transform:none}.toast{position:fixed;right:22px;bottom:22px;z-index:5000;max-width:min(390px,calc(100vw - 30px));padding:13px 16px;border-radius:15px;background:#102d54;color:#fff;box-shadow:0 15px 40px rgba(0,0,0,.24);font-size:.78rem;font-weight:900;opacity:0;transform:translateY(18px);pointer-events:none;transition:.25s}.toast.show{opacity:1;transform:translateY(0)}.toast.success{background:#08785d}.toast.error{background:#a62d32}
.xp-burst{position:fixed;z-index:5500;left:50%;top:45%;transform:translate(-50%,-50%);font-size:clamp(2.3rem,8vw,5rem);font-weight:1000;color:#ffd65b;text-shadow:0 5px 0 #613d00,0 15px 40px rgba(0,0,0,.35);animation:xpBurst 1.35s forwards;pointer-events:none}@keyframes xpBurst{0%{opacity:0;transform:translate(-50%,-30%) scale(.6)}25%{opacity:1;transform:translate(-50%,-50%) scale(1.12)}75%{opacity:1}100%{opacity:0;transform:translate(-50%,-85%) scale(1)}}
@media(max-width:1100px){.top-nav{display:none}.hero{grid-template-columns:1fr minmax(300px,.7fr);padding:45px 35px}.activity-grid{grid-template-columns:repeat(3,1fr)}.player-panel{grid-template-columns:1fr auto}.player-stats{order:3;grid-column:1/-1;border:0;border-top:1px solid var(--line);padding-top:14px;justify-content:center}.seo-section{grid-template-columns:1fr}.class-bridge{grid-template-columns:auto 1fr}.class-bridge .button{grid-column:2;justify-self:start}}
@media(max-width:780px){html{scroll-padding-top:70px}.site-header{height:68px;padding:0 10px;gap:8px}.brand{min-width:0;margin-right:auto}.brand img{width:43px;height:43px}.brand strong{font-size:1.1rem}.brand small{display:none}.header-actions{margin-left:0;gap:6px}.header-grade-switch{height:44px;min-width:112px;width:112px;padding:0 22px 0 8px;font-size:.66rem}.header-grade-switch>i:first-child{font-size:.95rem}.header-grade-arrow{right:5px}.header-grade-menu{position:fixed;top:74px;left:10px;right:10px;width:auto;max-height:calc(100vh - 92px);overflow:auto}.header-actions .button span{display:none}.header-actions .button{width:44px;min-height:44px;padding:0}.player-mini{min-height:44px;padding:5px 7px}.player-mini-copy,.player-mini-arrow{display:none}.header-avatar{width:32px;height:32px}.hero{margin:12px 10px 18px;border-radius:24px;min-height:auto;grid-template-columns:1fr;padding:32px 20px 22px;gap:42px}.hero h1{font-size:clamp(2.5rem,13vw,4rem)}.hero-actions{display:grid}.hero-actions .button{width:100%}.hero-board{transform:none;max-width:520px;width:100%;justify-self:center}.podium{height:225px}.podium-player.first{height:190px}.podium-player.second{height:155px}.podium-player.third{height:135px}.player-panel{margin:0 10px 18px;grid-template-columns:1fr;padding:16px}.player-actions{justify-content:stretch}.player-actions .button{flex:1}.player-stats{display:grid;grid-template-columns:repeat(4,1fr);width:100%;padding-top:11px}.player-stats div{padding:0 6px}.player-stats b{font-size:1rem}.content-section,.how-section,.faq-section{margin:20px 10px;padding:22px 15px;border-radius:24px}.section-heading{align-items:flex-start}.library-toolbar{grid-template-columns:1fr}.type-filter{margin-right:-15px;padding-right:15px}.activity-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.activity-card{min-height:255px}.activity-art{height:105px}.activity-body{padding:12px}.activity-card h3{font-size:.86rem}.class-bridge{margin:20px 10px;padding:23px 18px;border-radius:24px;grid-template-columns:1fr;text-align:center}.class-bridge-icon{margin:auto}.class-bridge .button{grid-column:auto;justify-self:stretch}.leaderboard-section{margin:20px 10px;padding:24px 15px;border-radius:24px}.leaderboard-layout{grid-template-columns:1fr}.leaderboard-grades{display:flex;overflow:auto;flex-wrap:nowrap}.leaderboard-grades button{min-width:75px}.leaderboard-row{grid-template-columns:35px 1fr auto}.leaderboard-completed{display:none}.score-rules{padding:18px}.steps-grid{grid-template-columns:1fr}.seo-section{margin:20px 10px;padding:24px 17px;border-radius:24px}.grade-seo-grid{grid-template-columns:1fr 1fr}.faq-list{grid-template-columns:1fr}footer{display:grid;padding:30px 18px 100px}footer>p{margin:0}footer>div:last-child{flex-wrap:wrap}.mobile-nav{position:fixed;z-index:1500;left:10px;right:10px;bottom:max(9px,env(safe-area-inset-bottom));height:64px;border:1px solid rgba(255,255,255,.25);border-radius:20px;background:rgba(10,38,68,.94);backdrop-filter:blur(12px);box-shadow:0 15px 45px rgba(0,0,0,.25);display:grid;grid-template-columns:repeat(4,1fr);padding:5px;color:#d9e8f4}.mobile-nav a,.mobile-nav button{border:0;background:transparent;color:inherit;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;font-size:.58rem;font-weight:900}.mobile-nav i{font-size:1.25rem}.modal{padding:8px;align-items:flex-end}.modal-card{max-height:92vh;border-radius:25px 25px 18px 18px;padding:24px 17px}.choice-grid{grid-template-columns:1fr}.auth-tabs{grid-template-columns:1fr 1fr 1fr}.auth-tabs button{font-size:.6rem}.two-cols{grid-template-columns:1fr}.toast{bottom:86px;right:15px}}
@media(max-width:390px){.brand strong{font-size:1rem}.brand img{width:40px;height:40px}.brand{gap:7px}.header-grade-switch{min-width:94px;width:94px}.header-actions{gap:4px}}
@media(max-width:430px){.hero-points{gap:8px;font-size:.7rem}.hero-board{padding:15px}.podium{gap:6px}.podium-avatar{width:50px;height:50px;font-size:1.8rem}.player-identity{align-items:flex-start}.player-actions{display:grid;grid-template-columns:1fr auto}.player-actions .button-warning{grid-column:1/-1}.activity-grid{grid-template-columns:1fr 1fr}.activity-card{min-height:240px}.activity-art{height:94px;font-size:2.35rem}.activity-type{font-size:.54rem}.activity-card h3{font-size:.78rem}.activity-meta{font-size:.6rem}.source-badge,.xp-badge{font-size:.5rem}.grade-seo-grid{grid-template-columns:1fr}.section-heading h2{font-size:1.75rem}}
@media(min-width:1600px){main{max-width:1680px}.activity-grid{grid-template-columns:repeat(5,1fr)}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}