@media(max-width:680px){
    html{scroll-padding-top:68px}
    body{overflow-x:hidden}
    .store-container{width:min(calc(100% - 32px),var(--container))}

    /* Header controls stay aligned and remain easy to tap on narrow screens. */
    .store-header{height:68px;position:sticky;top:0}
    .store-nav{gap:8px}
    .store-brand{min-width:0;gap:8px;font-size:10px;letter-spacing:.055em}
    .store-brand>span{width:34px;height:34px;flex:0 0 34px}
    .store-brand>div{white-space:nowrap}
    .store-brand small{font-size:6px}
    .cart-link,.store-menu{position:relative;width:42px;height:42px;flex:0 0 42px;padding:0;border:1px solid #333;border-radius:8px;display:grid;place-items:center;color:#fff;background:#0b0b0b;font-size:19px}
    .cart-link{margin-left:auto}
    .cart-link i,.store-menu i{line-height:1}
    .cart-link span{position:absolute;right:-4px;top:-5px;width:auto;min-width:19px;height:19px;margin:0;padding:0 4px;border:2px solid #000;font-size:8px}
    .store-menu{margin-left:0;cursor:pointer}
    .store-nav nav.open{display:flex;position:absolute;left:0;right:0;top:68px;background:#070707;border-top:1px solid rgba(255,255,255,.1);border-bottom:1px solid rgba(255,255,255,.1);padding:8px 16px 14px;flex-direction:column;gap:0;box-shadow:0 18px 30px rgba(0,0,0,.28)}
    .store-nav nav.open a{min-height:48px;padding:0 4px;display:flex;align-items:center;gap:12px;border-bottom:1px solid rgba(255,255,255,.1);font-size:13px;color:#ddd}
    .store-nav nav.open a:last-child{border-bottom:0}
    .store-nav nav.open i{width:20px;color:var(--blue);font-size:16px;text-align:center}

    /* Hero content scales with the viewport instead of using a fixed 520px scene. */
    .store-hero-inner{min-height:0;padding:64px 0 42px;gap:34px}
    .store-kicker{font-size:9px;letter-spacing:.1em}
    .store-hero h1{font-size:clamp(40px,13vw,52px);line-height:1.02;margin:20px 0;overflow-wrap:anywhere}
    .store-hero-inner>div:first-child>p{font-size:14px;line-height:1.7;margin-bottom:26px}
    .store-button{min-height:48px}
    .store-stack{width:100%;height:310px;transform:none}
    .stack-book{width:min(42vw,165px);height:auto;aspect-ratio:2/3;padding:17px;box-shadow:12px 22px 28px rgba(0,0,0,.55)}
    .stack-book b{font-size:clamp(15px,5vw,21px);overflow-wrap:anywhere}
    .stack-book.one{left:1%;top:54px}
    .stack-book.two{left:29%;top:15px}
    .stack-book.three{left:auto;right:1%;top:68px}
    .store-promises{min-height:0;padding:12px 0;gap:0}
    .store-promises span{min-width:0;min-height:72px;padding:9px 5px;line-height:1.35;overflow-wrap:anywhere}

    /* Catalog controls and cards never force the page wider than the screen. */
    .catalog{padding:68px 0 80px}
    .catalog-head{margin-bottom:24px}
    .catalog-head h2,.page-heading h1{font-size:clamp(32px,10vw,39px);overflow-wrap:anywhere}
    .catalog-search{min-width:0}
    .catalog-search input{width:0;padding-inline:8px;font-size:16px}
    .catalog-search button{padding:0 14px}
    .catalog-search>a{flex:0 0 38px}
    .catalog-filter{max-width:100%;scrollbar-width:thin;overscroll-behavior-x:contain;-webkit-overflow-scrolling:touch}
    .book-grid{min-width:0}
    .book-card{min-width:0}
    .cover-wrap>em{right:6px;top:6px;max-width:calc(100% - 12px);line-height:1.25}
    .catalog-result-meta span,.book-info>span,.book-info h3,.book-info>p{overflow-wrap:anywhere}
    .book-info>div{gap:4px}
    .book-info strong{min-width:0;font-size:12px;overflow-wrap:anywhere}
    .book-card .quick-add button{width:40px;height:40px;padding:0;display:grid;place-items:center;border-radius:6px;font-size:16px}
    .book-card .quick-add button:active{background:rgba(0,153,255,.1)}

    /* The detail-page action keeps its text inside the available width. */
    .detail-buy{width:100%;gap:16px}
    .detail-buy>strong{font-size:26px}
    .detail-buy form{display:grid;grid-template-columns:72px minmax(0,1fr);align-items:end;gap:10px;width:100%}
    .detail-buy label,.detail-buy input{min-width:0}
    .detail-buy input{width:70px}
    .detail-buy .store-button{width:100%;min-width:0;min-height:46px;height:auto;padding:10px 12px;gap:8px;font-size:10px;line-height:1.25;white-space:normal}
    .detail-buy .store-button i{flex:0 0 auto;font-size:14px}

    .publish-band{padding:76px 0}
    .publish-band h2{font-size:clamp(30px,10vw,38px);line-height:1.1;overflow-wrap:anywhere}
    .publish-band p{font-size:14px}
    .store-footer{padding-top:56px}
    .store-footer>.store-container:first-child{gap:30px}
    .store-footer a{min-height:34px;display:flex;align-items:center;gap:8px;font-size:11px}
    .store-copyright{line-height:1.6}
}

@media(max-width:370px){
    .store-container{width:min(calc(100% - 24px),var(--container))}
    .store-brand{font-size:9px}
    .store-brand>span{width:32px;height:32px;flex-basis:32px}
    .cart-link,.store-menu{width:40px;height:40px;flex-basis:40px}
    .store-hero h1{font-size:39px}
    .store-stack{height:280px}
    .stack-book{padding:13px}
    .book-grid{gap:26px 10px}
    .generated-cover{padding:12px}
    .book-info strong{font-size:11px}
    .detail-buy form{grid-template-columns:66px minmax(0,1fr);gap:8px}
    .detail-buy input{width:64px;padding-inline:9px}
    .detail-buy .store-button{padding-inline:9px;gap:6px;font-size:9px}
}