:root{
--primary:#4d50d8;--primary-dark:#3436ac;--purple:#7853c7;--sky:#eaf4ff;
--yellow:#f6c453;--green:#2faf77;--orange:#f28b48;--text:#20253a;
--muted:#697087;--border:#e4e7f0;--surface:#fff;--background:#f8f9fd;
--radius:18px;--shadow:0 10px 34px rgba(40,46,100,.08);--container:1240px}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Tahoma,Arial,sans-serif;color:var(--text);background:var(--background);line-height:1.8}img{max-width:100%;height:auto;display:block}a{color:inherit;text-decoration:none}button,input{font:inherit}.container{width:min(calc(100% - 32px),var(--container));margin-inline:auto}.reading-container{max-width:880px}.sr-only,.skip-link:not(:focus){position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}.skip-link:focus{position:fixed;top:12px;right:12px;z-index:9999;background:#fff;padding:10px 16px;border-radius:10px}
.site-header{position:sticky;top:0;z-index:1000;background:rgba(255,255,255,.96);border-bottom:1px solid var(--border);backdrop-filter:blur(14px)}.header-inner{min-height:74px;display:flex;align-items:center;gap:22px}.brand{display:flex;align-items:center;gap:10px;margin-inline-end:auto}.brand img{width:52px;height:52px;object-fit:contain}.brand span{display:grid;line-height:1.25}.brand strong{color:var(--primary);font-size:1.1rem}.brand small{color:var(--muted);font-size:.72rem}.primary-nav ul{list-style:none;display:flex;gap:22px;padding:0;margin:0}.primary-nav a{font-weight:700}.search-toggle,.menu-toggle{width:44px;height:44px;display:grid;place-items:center;border:1px solid var(--border);background:#fff;border-radius:50%;color:var(--primary)}.menu-toggle{display:none}.search-panel{padding:14px 0;border-top:1px solid var(--border)}.search-form,.hero-search{display:flex;gap:10px}.search-form label{flex:1}.search-field,.hero-search input{width:100%;min-height:52px;padding:0 18px;border:1px solid var(--border);border-radius:12px;background:#fff}.search-form button,.hero-search button{border:0;padding:0 24px;border-radius:12px;background:var(--primary);color:#fff;font-weight:700}
.hero{overflow:hidden;background:radial-gradient(circle at 80% 30%,rgba(120,83,199,.13),transparent 35%),radial-gradient(circle at 20% 75%,rgba(71,170,255,.18),transparent 38%),#fff;border-bottom:1px solid var(--border)}.hero-grid{min-height:520px;display:grid;grid-template-columns:1.1fr .9fr;align-items:center;gap:56px;padding-block:64px}.eyebrow{color:var(--primary);font-size:.85rem;font-weight:800}.hero h1{margin:10px 0 14px;font-size:clamp(2.4rem,5vw,4.5rem);line-height:1.22}.hero h1 span{color:var(--primary)}.hero p{color:var(--muted);font-size:1.08rem}.hero-search{margin-top:26px;padding:10px;background:#fff;border-radius:16px;box-shadow:var(--shadow)}.hero-search input{border:0;outline:0}.hero-actions{display:flex;gap:12px;margin-top:22px}.hero-visual{display:grid;place-items:center}.hero-visual img{width:min(100%,410px);filter:drop-shadow(0 20px 35px rgba(40,46,100,.18))}
.btn{min-height:48px;display:inline-flex;align-items:center;justify-content:center;padding:0 22px;border:1px solid transparent;border-radius:12px;font-weight:800}.btn-primary{color:#fff;background:var(--primary)}.btn-secondary{color:var(--primary);background:#fff;border-color:var(--primary)}.section{padding-block:72px}.section-alt{background:#fff}.section-heading{display:flex;justify-content:space-between;align-items:end;gap:20px;margin-bottom:28px}.section-heading h2{margin:0;font-size:clamp(1.8rem,3vw,2.5rem)}
.grade-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:16px}.grade-card{min-height:140px;display:grid;place-items:center;align-content:center;gap:5px;padding:18px 12px;text-align:center;border:1px solid var(--border);background:#fff;border-radius:var(--radius);box-shadow:0 6px 18px rgba(40,46,100,.04)}.grade-card span{font-size:2rem}.grade-card small{color:var(--muted)}
.content-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}.content-card{overflow:hidden;background:#fff;border:1px solid var(--border);border-radius:var(--radius);box-shadow:0 5px 18px rgba(40,46,100,.05);transition:.2s}.content-card:hover{transform:translateY(-5px);box-shadow:var(--shadow)}.card-image{position:relative;aspect-ratio:16/9;display:block;overflow:hidden;background:linear-gradient(135deg,#eef1ff,#dff4ff)}.card-image img{width:100%;height:100%;object-fit:cover}.placeholder-image{display:block;width:100%;height:100%;background:linear-gradient(135deg,#eef1ff,#dff4ff)}.play-button{position:absolute;inset:50% auto auto 50%;transform:translate(-50%,-50%);width:54px;height:54px;display:grid;place-items:center;border-radius:50%;background:rgba(255,255,255,.94);color:var(--primary);box-shadow:0 10px 25px rgba(25,35,80,.18)}.play-button.large{width:76px;height:76px}.card-body{padding:18px}.card-body h2,.card-body h3{margin:8px 0;line-height:1.5;font-size:1.05rem}.card-body p{color:var(--muted);font-size:.9rem}.card-meta{color:var(--muted);font-size:.82rem}.badge{display:inline-flex;align-items:center;min-height:28px;padding:0 10px;border-radius:999px;background:#e8fff4;color:#168456;font-size:.75rem;font-weight:800}
.subject-grid{display:grid;grid-template-columns:repeat(8,1fr);gap:14px}.subject-card{min-height:112px;display:grid;place-items:center;align-content:center;gap:8px;border:1px solid var(--border);background:#fff;border-radius:var(--radius)}.subject-card span{font-size:1.6rem;color:var(--primary)}
.site-footer{padding-top:58px;color:#fff;background:linear-gradient(135deg,#282a7c,#45288e)}.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:50px}.site-footer p,.site-footer a{color:rgba(255,255,255,.82)}.site-footer ul{list-style:none;padding:0}.copyright{margin-top:42px;padding-block:18px;border-top:1px solid rgba(255,255,255,.16);text-align:center}
.single-header{margin-bottom:28px}.single-header h1{margin:5px 0;font-size:clamp(2rem,4.5vw,3.5rem);line-height:1.35}.lead{color:var(--muted)}.single-featured{overflow:hidden;border-radius:var(--radius)}.entry-content{font-size:1.04rem}.lite-youtube{position:relative;aspect-ratio:16/9;overflow:hidden;border-radius:var(--radius);background:#111}.lite-youtube-button{width:100%;height:100%;padding:0;border:0;background:transparent}.lite-youtube-button img,.lite-youtube iframe{width:100%;height:100%;object-fit:cover;border:0}.lesson-actions{display:flex;gap:12px;margin-block:22px 34px}.lesson-content-grid{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:34px}.meta-card,.info-box{padding:24px;border:1px solid var(--border);border-radius:var(--radius);background:#fff}.meta-card{position:sticky;top:100px}.info-box{margin-top:28px;background:#eef8ff}.info-box.purple{background:#f6f1ff}.comments-area{margin-top:58px;padding-top:38px;border-top:1px solid var(--border)}.comment-note{padding:14px 16px;background:#fff7dd;border-radius:12px}.comment-form input,.comment-form textarea{width:100%;padding:12px 14px;border:1px solid var(--border);border-radius:12px}.comment-form .submit{border:0;padding:13px 22px;border-radius:12px;color:#fff;background:var(--primary)}.empty-state{text-align:center;padding-block:90px}.error-code{color:var(--primary);font-size:5rem;font-weight:900}
@media(max-width:1050px){.primary-nav{display:none;position:absolute;top:74px;inset-inline:16px;padding:18px;background:#fff;border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow)}.primary-nav.is-open{display:block}.primary-nav ul{display:grid;gap:12px}.menu-toggle{display:grid}.hero-grid{grid-template-columns:1fr}.hero-visual{order:-1}.hero-visual img{width:min(70vw,340px)}.grade-grid{grid-template-columns:repeat(3,1fr)}.content-grid{grid-template-columns:repeat(2,1fr)}.subject-grid{grid-template-columns:repeat(4,1fr)}}
@media(max-width:720px){.container{width:min(calc(100% - 24px),var(--container))}.brand small{display:none}.brand img{width:46px;height:46px}.header-inner{min-height:66px;gap:10px}.primary-nav{top:66px}.hero-grid{min-height:auto;padding-block:42px}.hero-visual{display:none}.hero h1{font-size:2.3rem}.hero-search,.hero-actions,.lesson-actions{display:grid}.section{padding-block:48px}.grade-grid,.content-grid{grid-template-columns:repeat(2,1fr);gap:14px}.subject-grid{grid-template-columns:repeat(2,1fr)}.footer-grid{grid-template-columns:1fr;gap:22px}.lesson-content-grid{grid-template-columns:1fr}.meta-card{position:static}}
@media(max-width:430px){.grade-grid,.content-grid{grid-template-columns:1fr}}


.breadcrumbs{
display:flex;flex-wrap:wrap;align-items:center;gap:8px;
margin-bottom:22px;color:var(--muted);font-size:.88rem}
.breadcrumbs a{color:var(--primary);font-weight:700}
.single-labels{display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.lesson-meta-list{display:grid;gap:0;margin:0}
.lesson-meta-list>div{padding:13px 0;border-bottom:1px solid var(--border)}
.lesson-meta-list>div:last-child{border-bottom:0}
.lesson-meta-list dt{color:var(--muted);font-size:.78rem}
.lesson-meta-list dd{margin:2px 0 0;font-weight:800}
.vocabulary-list{display:grid;gap:10px}
.vocabulary-row{
display:grid;grid-template-columns:150px 1fr;gap:18px;
padding:12px 14px;border-radius:12px;background:rgba(255,255,255,.72)}
.vocabulary-row strong{color:var(--purple)}
.lesson-navigation{
display:grid;grid-template-columns:1fr 1fr;gap:18px;
margin-top:48px;padding-top:30px;border-top:1px solid var(--border)}
.lesson-nav-card{
display:grid;gap:4px;padding:20px;border:1px solid var(--border);
border-radius:var(--radius);background:#fff;transition:.2s}
.lesson-nav-card:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
.lesson-nav-card small{color:var(--muted)}
.lesson-nav-card.next{text-align:left}
.related-section{margin-top:56px}
.related-grid{grid-template-columns:repeat(3,1fr)}
.comments-area{max-width:860px;margin-inline:auto}
.comment-form-comment textarea{min-height:150px}
.comment-form .form-submit{margin-top:14px}
.comment-form .submit{width:100%}
@media(max-width:720px){
.vocabulary-row{grid-template-columns:1fr;gap:2px}
.lesson-navigation{grid-template-columns:1fr}
.related-grid{grid-template-columns:1fr}
.lesson-nav-card.next{text-align:right}
}


/* Home page adaptive grids */
.home-content-section{
    min-height:0;
}
.content-grid.items-1{
    grid-template-columns:minmax(260px, 320px);
    justify-content:start;
}
.content-grid.items-2{
    grid-template-columns:repeat(2,minmax(260px,320px));
    justify-content:start;
}
.content-grid.items-3{
    grid-template-columns:repeat(3,minmax(240px,1fr));
}
.content-grid.items-1 .content-card,
.content-grid.items-2 .content-card{
    width:100%;
}
.grades-section{
    padding-bottom:56px;
}
.subject-section{
    background:#fff;
}
@media(max-width:720px){
    .content-grid.items-1,
    .content-grid.items-2,
    .content-grid.items-3{
        grid-template-columns:1fr;
    }
}


.story-single-page .single-header h1{
    max-width:980px;
}
.story-age-label{
    display:inline-flex;
    min-height:28px;
    align-items:center;
    padding:0 10px;
    border-radius:999px;
    background:#f5f0ff;
    color:var(--purple);
    font-size:.78rem;
    font-weight:800;
}
.story-meta-card{
    border-top:4px solid var(--purple);
}
.story-objectives{
    background:#edf7ff;
    border-color:#d9ecff;
}
.story-primary-button{
    background:var(--purple);
}
.story-primary-button:hover{
    background:#5f3fb1;
}
.story-card .card-image{
    background:linear-gradient(135deg,#f4eeff,#e7f4ff);
}
.story-card .play-button,
.story-video .play-button{
    color:var(--purple);
}