/* Shared mobile layout; desktop rules remain in the component stylesheets. */
.community-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}
.community-card{display:grid;grid-template-columns:110px minmax(0,1fr);gap:20px;padding:24px;border:1px solid var(--border);border-radius:18px;background:var(--surface)}
.community-cover img{width:100%;height:auto;display:block;border-radius:6px}
.community-card h2{font-size:1.15rem;line-height:1.5;margin:0}
.community-card p,.community-note{color:var(--text-secondary);font-size:.95rem;line-height:1.7}
.community-book{display:block;margin-top:14px;min-height:44px;line-height:1.6}
.community-panel{padding:24px;margin-block:24px;background:var(--brand-soft);border:1px solid var(--border);border-radius:18px}
.community-panel h2{font-size:1.4rem}
.book-community-column{min-width:0}
.book-community-column .community-panel{margin:0}
@media(min-width:900px){
 .book-detail{grid-template-areas:"cover main" "community main";grid-template-rows:auto 1fr;row-gap:24px}
 .book-cover-column{grid-area:cover}
 .book-main-column{grid-area:main;min-width:0}
 .book-community-column{grid-area:community}
 .book-community-column .community-panel{padding:20px}
 .book-community-column h2{font-size:1.2rem}
 .book-community-column .community-join{align-items:center}
 .book-community-column .btn{white-space:normal;width:100%}
}
.community-join{display:flex;flex-direction:column;align-items:flex-start;gap:16px}
.community-qr{margin:0;max-width:100%;font-size:14px;line-height:1.7}
.community-qr img{display:block;width:180px;max-width:100%;height:auto;border:1px solid var(--border);border-radius:8px}
.community-qr figcaption{margin-top:8px;color:var(--text-secondary)}
.community-qr>a:last-child{display:inline-flex;align-items:center;min-height:44px}
@media(min-width:900px) and (max-width:1279px){.site-nav-mobile{max-height:calc(100dvh - 100px);overflow-y:auto}.site-burger{min-width:48px;min-height:48px}}
.community-steps{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:32px;padding-left:24px}
.community-steps li{padding:12px}
@media(max-width:899px){.community-grid,.community-steps{grid-template-columns:minmax(0,1fr)}.community-card{padding:18px;gap:14px;grid-template-columns:80px minmax(0,1fr)}.community-card .btn{width:100%;white-space:normal}.community-panel{padding:20px}.community-panel .btn{width:100%}}
.mobile-tabs{display:none}
.book-specs{margin-block:16px;border:1px solid var(--border);border-radius:12px;padding:0 16px}
.book-specs summary{padding:14px 0;cursor:pointer;font-weight:500}
.book-specs .spec-list{border:0;padding:0;margin:0 0 16px}
@media(max-width:899px){
 html{scroll-padding-top:90px;scroll-padding-bottom:90px}
 body{padding-bottom:calc(72px + env(safe-area-inset-bottom));-webkit-text-size-adjust:100%}
 .container{width:100%;padding-inline:16px;box-sizing:border-box}
 .site-header__inner{padding-inline:16px;gap:10px}
 .site-header__actions{gap:8px}
 .site-burger{width:48px;height:48px;flex-shrink:0}
 .site-nav-mobile{max-height:calc(100dvh - 150px);overflow-y:auto;overscroll-behavior:contain}
 .site-nav-mobile .site-nav__link{min-height:48px;display:flex;align-items:center}
 .mobile-tabs{position:fixed;inset:auto 0 0;z-index:44;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));padding:0 max(6px,env(safe-area-inset-right)) env(safe-area-inset-bottom) max(6px,env(safe-area-inset-left));background:var(--surface);border-top:1px solid var(--border);box-shadow:var(--shadow)}
 .mobile-tabs a{min-height:60px;display:flex;align-items:center;justify-content:center;gap:2px;color:var(--text-secondary);font-size:14px;font-weight:500;border-top:3px solid transparent;text-decoration:none}
 .mobile-tabs a[aria-current="page"]{color:var(--brand);border-top-color:var(--brand);background:var(--brand-soft)}
 .mobile-tabs .cart-count{margin-left:2px;min-width:18px;height:20px;padding:2px 4px}
 .cart-float{display:none}
 .cart-toast{bottom:calc(80px + env(safe-area-inset-bottom));left:12px;right:12px;max-width:none}
 .btn,.chip,summary{min-height:44px}
 input:not([type=checkbox]):not([type=radio]),select,textarea{font-size:16px!important;min-height:48px}
 input[type=checkbox],input[type=radio]{width:22px;height:22px;flex-shrink:0}
 button,a,input,select,summary{-webkit-tap-highlight-color:var(--brand-soft)}
 :is(a,button,input,select,summary):focus-visible{outline:3px solid var(--brand);outline-offset:3px}
 .breadcrumb{font-size:13px;line-height:1.6;overflow-wrap:anywhere;margin-block:16px}
 .book-detail{gap:20px}
 .book-detail__cover{max-width:230px;margin-inline:auto}
 .book-detail__title{font-size:clamp(1.5rem,5.5vw,2rem);line-height:1.45}
 .reader-jumps{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:6px}
 .reader-jumps a{font-size:14px;padding:12px 5px;text-align:center;background:var(--surface)}
 .spec-list div{display:grid;grid-template-columns:minmax(90px,.7fr) minmax(0,1.3fr);gap:12px}
 .spec-list dt{min-width:0}
 .spec-list dd{overflow-wrap:anywhere}
 .hero__actions{gap:10px}
 .purchase .hero__actions,.order-send .hero__actions{display:grid;grid-template-columns:1fr}
 .purchase .hero__actions .btn,.order-send .hero__actions .btn{width:100%}
 .purchase-controls label{min-width:0;width:100%}
 .buy-option{min-height:56px;font-size:16px}
 .buy-option b{white-space:nowrap}
 .price-choices{gap:12px}
 .order-line{display:grid;grid-template-columns:1fr auto;gap:14px;align-items:center}
 .order-line strong{grid-column:1/-1;min-width:0}
 .order-line label{min-height:48px;flex-wrap:wrap}
 .order-line button{grid-column:2;justify-self:end}
 .order-summary{padding:18px}
 .order-summary>label{display:grid;gap:10px}
 .order-page h1{font-size:1.8rem}
 .order-page textarea{box-sizing:border-box}
 .catalog-controls>.filters{margin-bottom:18px}
 .catalog-controls .filters[role=group]{gap:8px}
 .catalog-controls .chip{font-size:14px;padding:10px 12px}
 .article-pager{gap:10px;flex-wrap:wrap}
 .article__body{font-size:17px;line-height:1.85}
 .article__body table{overscroll-behavior-x:contain}
 .article__sources{padding:18px}
 .collection__intro,.collection--starter .collection__intro{padding:20px}
 .collection__browse{padding:16px}
 .collection .purchase{padding:14px;margin-block:18px}
 .collection__shelf{scroll-padding-inline:2px;overscroll-behavior-x:contain;touch-action:pan-x pan-y pinch-zoom}
 .cover-dialog__body{overscroll-behavior:contain;touch-action:pan-x pan-y pinch-zoom}
 .cover-dialog__bar button{min-height:48px}
 .page-hero__title,.section__title{overflow-wrap:anywhere}
 .cta-panel{padding:20px}
 .cta-panel .btn{width:100%}
 [data-reveal]{opacity:1!important;transform:none!important;transition:none!important}
}
@media(min-width:360px) and (max-width:599px){
 .grid--books{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
 .book-card__title{font-size:15px}
 .book-card__body{padding:10px}
 .book-card__body .badge{font-size:11px;padding:5px 7px}
 .book-card__meta{font-size:12px}
}
@media(max-width:359px){.grid--books,.grid--4{grid-template-columns:minmax(0,1fr)}.wordmark__tagline{display:none}.site-header__actions .btn{padding:8px;font-size:13px}.mobile-tabs a{font-size:12px}}
.assistant-float{position:fixed;right:20px;bottom:calc(90px + env(safe-area-inset-bottom));z-index:45;display:flex;align-items:center;gap:8px;min-height:48px;padding:12px 16px;background:var(--surface);color:var(--brand);border:1px solid var(--brand);border-radius:var(--radius-pill);box-shadow:var(--shadow);font-weight:600;text-decoration:none}
.assistant-float:hover{background:var(--brand-soft)}
.assistant-float:focus-visible{outline:3px solid var(--brand);outline-offset:4px}
body[data-page="assistant"] .assistant-float{display:none}
@media(max-width:899px){.assistant-float{right:12px;bottom:calc(74px + env(safe-area-inset-bottom));padding:10px 14px;font-size:14px}}
.assistant-chat-section.section{padding-block:20px}
.chat-shell{height:calc(100dvh - 130px);min-height:420px;max-height:920px;display:flex;flex-direction:column;overflow:hidden;border:1px solid var(--border);border-radius:var(--radius-lg);background:var(--surface)}
.chat-header{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:18px 0;border-bottom:1px solid var(--border)}
.chat-header h1{font-size:1.4rem;margin:4px 0}.chat-header p,.chat-status,.chat-privacy{font-size:.8rem;color:var(--text-secondary);margin:0}
.chat-context{display:flex;align-items:center;gap:12px;padding:10px 0;font-size:.85rem}.chat-context select{min-width:0;flex:1}
.chat-messages{flex:1;min-height:120px;overflow-y:auto;overscroll-behavior:contain;padding:16px 4px;display:flex;flex-direction:column;gap:16px}
.chat-message{max-width:90%;padding:14px 16px;border-radius:var(--radius);background:var(--surface-soft);align-self:flex-start;overflow-wrap:anywhere;flex-shrink:0}
.chat-message--user{align-self:flex-end;background:var(--brand);color:var(--text-on-dark)}
.chat-message__label{display:block;font-size:.75rem;margin-bottom:6px}.chat-message__text{white-space:pre-wrap;line-height:1.8}
.chat-message__sources{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}.chat-message__sources a{display:block;border:1px solid var(--border);border-radius:var(--radius-sm);padding:8px 10px;font-size:.85rem;background:var(--surface)}
.chat-copy,.chat-suggestions button{font:inherit;color:var(--brand);background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-pill);padding:10px 12px;cursor:pointer;font-size:.85rem;min-height:44px}
.chat-copy{margin-top:12px}.chat-suggestions{display:flex;gap:8px;overflow-x:auto;padding:8px 0;flex-shrink:0}.chat-suggestions button{white-space:nowrap}
.shop-assistant .chat-composer{display:flex;align-items:flex-end;gap:8px;padding:10px 0;border-top:1px solid var(--border)}
.shop-assistant .chat-composer textarea{min-height:52px;max-height:120px;flex:1;min-width:0;resize:none}.chat-composer .btn{min-height:52px}
.chat-status{padding:4px 0}.chat-privacy{padding:4px 0 12px}
@media(max-width:899px){.assistant-chat-section.section{padding:8px 0}.chat-shell{height:calc(100dvh - 156px - env(safe-area-inset-bottom));border-radius:var(--radius-sm);min-height:360px}.chat-header{padding:10px 0}.chat-header h1{font-size:1.15rem}.chat-header .btn{font-size:.8rem;padding:10px}.chat-context{gap:6px}.chat-context label{font-size:.75rem}.chat-message{max-width:94%;padding:12px}.chat-privacy{font-size:.7rem}}
/* Dedicated conversation screen; shared catalogue chrome stays on other pages. */
body[data-page="assistant"]{padding:0;overflow:hidden}
body[data-page="assistant"] .site-header,body[data-page="assistant"] .site-footer,body[data-page="assistant"] .mobile-tabs,body[data-page="assistant"] .cart-float{display:none}
body[data-page="assistant"] main{padding:0}
body[data-page="assistant"] .assistant-chat-section{padding:0}
body[data-page="assistant"] .chat-shell{position:relative;max-width:none;width:100%;height:100dvh;height:var(--chat-viewport-height,100dvh);min-height:0;max-height:none;padding:0 clamp(16px,4vw,48px);border:0;border-radius:0;overflow:hidden;gap:0}
.chat-shell .chat-header{padding:14px 0;gap:16px;border:0;flex-shrink:0}
.chat-shell .chat-heading{flex:1;min-width:0}
.chat-shell .chat-header h1{font-size:1.1rem;display:flex;gap:10px;flex-wrap:wrap;margin:0}.chat-heading h1 span{font-weight:400;color:var(--text-secondary)}
.chat-shell .chat-header p{font-size:.72rem;margin-top:4px}
.chat-back,.chat-new{display:flex;align-items:center;gap:8px;min-height:44px;padding:8px;color:var(--text);background:transparent;border:0;border-radius:var(--radius-sm);font:inherit;text-decoration:none;cursor:pointer}
.chat-new:hover,.chat-back:hover{background:var(--surface-soft)}
.chat-shell .chat-messages{width:100%;max-width:780px;margin:0 auto;padding:24px 4px;gap:30px;min-height:0}
.chat-shell .chat-message--bot{max-width:100%;width:100%;background:none;padding:0;color:var(--text)}
.chat-shell .chat-message--user{max-width:85%;background:var(--surface-soft);color:var(--text);padding:12px 20px;border-radius:var(--radius-lg)}
.chat-shell .chat-message__label{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%)}
.chat-shell .chat-copy{background:none;border:0;color:var(--text-secondary);padding:8px 0;font-size:.78rem}
.chat-welcome{width:100%;max-width:780px;margin:auto;text-align:center;padding:28px 0}
.chat-welcome h2{font-size:clamp(1.5rem,4vw,2rem);margin:12px 0}.chat-welcome>p{color:var(--text-secondary)}
.chat-shell.chat-empty .chat-messages{flex:0;padding:0;overflow:hidden}
.chat-shell .chat-suggestions{justify-content:center;flex-wrap:wrap;overflow:visible;margin-top:24px}
.chat-shell .chat-suggestions button{color:var(--text);white-space:normal}
.chat-bottom{width:100%;max-width:780px;margin:0 auto;flex-shrink:0;padding-top:12px;padding-bottom:max(10px,env(safe-area-inset-bottom));background:var(--surface)}
.chat-composer-wrap{border:1px solid var(--border);border-radius:26px;background:var(--surface-soft);padding:10px 14px;box-shadow:var(--shadow-sm)}
.chat-shell .chat-context{display:block;padding:0;font-size:.78rem;max-width:100%}
.chat-context summary{cursor:pointer;min-height:32px;max-width:100%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:var(--text-secondary)}
.chat-context select{margin-block:8px;max-width:100%}
.chat-shell .chat-composer{border:0;padding:0;gap:12px}
.chat-shell .chat-composer textarea{font-size:16px;background:transparent;border:0;border-radius:0;box-shadow:none;padding:10px 2px;min-height:44px;max-height:160px;line-height:1.5;overflow-y:auto}
.chat-send{display:flex;align-items:center;justify-content:center;width:44px;height:44px;flex-shrink:0;border:0;border-radius:50%;background:var(--text);color:var(--surface);cursor:pointer}
.chat-send:disabled{opacity:.35;cursor:default}
.chat-shell button:focus-visible,.chat-back:focus-visible,.chat-context summary:focus-visible{outline:2px solid var(--brand);outline-offset:3px}
.chat-shell .chat-status{text-align:center;font-size:.72rem;min-height:20px;padding-top:8px}
.chat-shell .chat-privacy{text-align:center;font-size:.68rem;padding:4px 0 0}
@media(max-width:640px){.chat-back span,.chat-new span,.chat-heading h1 span{display:none}.chat-shell .chat-header{gap:8px;padding:8px 0}.chat-shell .chat-header h1{font-size:1rem}.chat-shell .chat-header p{font-size:.65rem}.chat-shell .chat-messages{padding:16px 0}.chat-shell .chat-message--user{max-width:90%}.chat-welcome .section__eyebrow{font-size:.7rem}.chat-shell .chat-suggestions{gap:8px}.chat-shell .chat-suggestions button{font-size:.8rem}.chat-shell .chat-bottom{padding-top:8px}.chat-shell .chat-privacy{font-size:.62rem}}
@media(max-height:500px){.chat-shell .chat-privacy,.chat-welcome .section__eyebrow,.chat-welcome>p{display:none}.chat-welcome{padding:8px 0}.chat-shell .chat-suggestions{margin-top:8px}.chat-welcome h2{font-size:1.15rem;margin:6px 0}}
.chat-book-choices{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;margin-top:16px}
.chat-book-choices button{min-height:44px;padding:10px 12px;text-align:left;font:inherit;font-size:.85rem;background:var(--surface-soft);border:1px solid var(--border);color:var(--text);border-radius:var(--radius-sm);cursor:pointer}
.chat-book-choices button:hover{border-color:var(--brand);color:var(--brand)}
.chat-shell details.chat-message__sources{display:block;font-size:.8rem;color:var(--text-secondary)}
.chat-message__sources summary{cursor:pointer;min-height:44px;padding-block:12px}
.chat-shell details.chat-message__sources a{margin-block:6px;width:fit-content}
@media(max-width:640px){.chat-book-choices{grid-template-columns:minmax(0,1fr)}}

/* Conversation feedback uses only opacity/transform and honors reduced motion. */
.chat-shell .chat-message{animation:chat-arrive .18s ease-out}
.chat-shell .chat-waiting{display:flex;align-items:center;gap:12px;min-height:44px;color:var(--text-secondary);font-size:.85rem}
.chat-loading-dots{display:inline-flex;gap:5px;align-items:center;height:24px}
.chat-loading-dots i{display:block;width:7px;height:7px;border-radius:50%;background:var(--brand);animation:chat-dot 1.1s ease-in-out infinite}
.chat-loading-dots i:nth-child(2){animation-delay:.15s}.chat-loading-dots i:nth-child(3){animation-delay:.3s}
.chat-message--revealing .chat-message__text::after{content:"";display:inline-block;width:3px;height:1em;margin-inline-start:3px;vertical-align:text-bottom;background:var(--brand);animation:chat-caret .7s ease-in-out infinite}
@keyframes chat-arrive{from{opacity:0;transform:translateY(5px)}to{opacity:1;transform:translateY(0)}}
@keyframes chat-dot{0%,70%,100%{opacity:.35;transform:translateY(0)}35%{opacity:1;transform:translateY(-4px)}}
@keyframes chat-caret{50%{opacity:0}}
@media(prefers-reduced-motion:reduce){.chat-shell .chat-message,.chat-loading-dots i,.chat-message--revealing .chat-message__text::after{animation:none}}