:root{font-synthesis:none;color:oklch(24% .025 67);--paper:oklch(98% .014 83);--paper-deep:oklch(92% .027 80);--ink:oklch(24% .025 67);--muted:oklch(48% .027 67);--line:oklch(82% .034 78);--accent:oklch(46% .105 150);--accent-dark:oklch(34% .085 150);--danger:oklch(48% .14 28);--focus:oklch(58% .15 240);--space-xs:.25rem;--space-sm:.5rem;--space-md:1rem;--space-lg:1.5rem;--space-xl:2rem;--space-2xl:3rem;--ease-out:cubic-bezier(.22, 1, .36, 1);background:oklch(96% .018 83);font-family:Avenir Next,PingFang SC,Microsoft YaHei,sans-serif}*{box-sizing:border-box}html{background:var(--paper-deep);min-width:320px}body{background:var(--paper);min-width:320px;min-height:100vh;margin:0;font-size:1rem;line-height:1.5}button,input,select{font:inherit}button,a,input,select{-webkit-tap-highlight-color:transparent}button{border:1px solid var(--line);background:var(--paper);min-height:44px;color:var(--ink);cursor:pointer;transition:transform .13s var(--ease-out), background .13s var(--ease-out);border-radius:.35rem;padding:.55rem 1rem}button:active{transform:translateY(1px)}button:disabled{cursor:not-allowed;opacity:.45}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid var(--focus);outline-offset:3px}h1,h2,h3,p{margin-top:0}h1,h2{letter-spacing:-.025em;font-family:Iowan Old Style,Songti SC,Noto Serif SC,serif;font-weight:700}h1{margin-bottom:var(--space-md);font-size:clamp(2.25rem,5vw,4.5rem);line-height:1.04}h2{font-size:1.75rem;line-height:1.2}.sr-only{clip:rect(0, 0, 0, 0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.eyebrow{color:var(--accent-dark);letter-spacing:.16em;text-transform:uppercase;margin-bottom:var(--space-sm);font-size:.75rem;font-weight:750}.login-page{min-height:100svh;padding:max(1.5rem, env(safe-area-inset-top)) max(1.5rem, env(safe-area-inset-right)) max(1.5rem, env(safe-area-inset-bottom)) max(1.5rem, env(safe-area-inset-left));background:linear-gradient(112deg, var(--paper) 0 59%, var(--paper-deep) 59% 100%);place-items:center;display:grid}.login-panel{width:min(100%,31rem);margin-left:-8vw}.login-panel:before{content:"";background:var(--accent);width:4.5rem;height:.32rem;margin-bottom:var(--space-xl);display:block}.login-intro{color:var(--muted);margin-bottom:var(--space-xl);font-size:1.125rem}.pin-form{gap:var(--space-sm);display:grid}.pin-form label{font-weight:700}.pin-form input{border:1px solid var(--line);background:var(--paper);width:100%;min-height:3.5rem;color:var(--ink);letter-spacing:.35em;border-radius:.35rem;padding:.7rem 1rem;font-size:1.5rem}.admin-login .pin-form input{letter-spacing:normal;font-size:1.125rem}.primary-action{background:var(--accent);border-color:var(--accent);color:oklch(97% .01 150);font-weight:750}.primary-action:hover{background:var(--accent-dark)}.form-error{color:var(--danger);margin:var(--space-xs) 0;font-weight:650}.library-page,.admin-page{width:min(100%,94rem);margin:0 auto;padding:clamp(1.5rem,4vw,4rem)}.library-header{justify-content:space-between;align-items:flex-start;gap:var(--space-xl);padding-bottom:var(--space-xl);border-bottom:1px solid var(--line);display:flex}.library-header h1{margin-bottom:0}.quiet-action{background:0 0}.grade-tabs{gap:var(--space-sm);margin:var(--space-xl) 0 var(--space-2xl);border-bottom:1px solid var(--line);display:flex}.grade-tabs button{color:var(--muted);background:0 0;border:0;border-radius:0;padding:.75rem 1.5rem;font-size:1.125rem;font-weight:700;position:relative}.grade-tabs button[aria-selected=true]{color:var(--ink)}.grade-tabs button[aria-selected=true]:after{content:"";background:var(--accent);height:3px;position:absolute;bottom:-1px;left:.75rem;right:.75rem}.subject-sections{gap:clamp(3rem,7vw,6rem);display:grid}.subject-section{container-type:inline-size}.subject-section>h2{align-items:center;gap:var(--space-md);margin-bottom:var(--space-lg);display:flex}.subject-section>h2:after{content:"";background:var(--line);flex:1;height:1px}.book-grid{grid-template-columns:repeat(auto-fill,minmax(180px,1fr));align-items:start;gap:clamp(1rem,2.2vw,2.25rem);display:grid}.book-card a{color:inherit;text-decoration:none;display:block}.cover-frame{aspect-ratio:3/4.15;background:var(--paper-deep);transition:transform .22s var(--ease-out), box-shadow .22s var(--ease-out);overflow:hidden;box-shadow:0 .55rem 1.4rem oklch(30% .03 70/.13)}.cover-frame img{object-fit:cover;width:100%;height:100%;display:block}.book-card-copy{padding-top:.9rem}.book-card h3{margin:.45rem 0 .65rem;font-family:Iowan Old Style,Songti SC,serif;font-size:1rem;line-height:1.45}.book-meta{color:var(--muted);justify-content:space-between;gap:.5rem;font-size:.75rem;font-weight:700;display:flex}.reading-progress{background:var(--paper-deep);height:3px;overflow:hidden}.reading-progress>span{background:var(--accent);height:100%;display:block}.text-cover{color:oklch(94% .02 80);background:oklch(40% .09 155);align-content:space-between;width:100%;height:100%;padding:12%;display:grid}.text-cover[data-subject=数学]{background:oklch(42% .105 250)}.text-cover[data-subject=英语]{background:oklch(45% .11 25)}.text-cover[data-subject=物理]{background:oklch(38% .09 295)}.text-cover[data-subject=化学]{background:oklch(42% .09 190)}.text-cover span{letter-spacing:.15em;font-weight:800}.text-cover strong{font-family:Songti SC,serif;font-size:1.15rem}.state-message,.state-page,.reader-loading{text-align:center;color:var(--muted);padding:4rem 1.5rem}.state-page{place-content:center;justify-items:center;min-height:100svh;display:grid}.state-page h1{color:var(--ink)}@media (hover:hover){.book-card a:hover .cover-frame{transform:translateY(-6px)rotate(-.35deg);box-shadow:0 1rem 2rem oklch(30% .03 70/.18)}}.reader-page{color:oklch(94% .014 83);background:oklch(28% .025 67);height:100svh;overflow:hidden}.reader-toolbar{align-items:center;gap:var(--space-md);min-height:64px;padding:max(.5rem, env(safe-area-inset-top)) max(.75rem, env(safe-area-inset-right)) .5rem max(.75rem, env(safe-area-inset-left));z-index:100;background:oklch(22% .023 67);grid-template-columns:auto 1fr auto;display:grid;position:relative}.reader-toolbar button,.reader-toolbar input{color:oklch(94% .014 83);background:oklch(30% .025 67);border-color:oklch(42% .025 67)}.reader-navigation,.reader-actions{align-items:center;gap:var(--space-sm);display:flex}.reader-navigation{justify-content:center}.reader-actions{justify-content:flex-end}.page-jump{align-items:center;gap:.4rem;display:flex;position:relative}.page-jump label{color:oklch(78% .018 83);font-size:.75rem}.page-jump input{text-align:center;border-radius:.25rem;width:4rem;min-height:44px}.toolbar-error{white-space:nowrap;background:oklch(35% .12 28);border-radius:.25rem;padding:.35rem .6rem;position:absolute;top:calc(100% + .5rem);left:50%;transform:translate(-50%)}.review-list{position:relative}.review-list summary{cursor:pointer;align-items:center;min-height:44px;display:flex}.review-list>div{background:oklch(22% .023 67);border:1px solid oklch(42% .025 67);width:10rem;max-height:40vh;padding:.5rem;display:grid;position:absolute;top:calc(100% + .4rem);right:0;overflow:auto}.reader-stage{place-items:center;height:calc(100svh - 64px);padding:1rem;display:grid}.flip-book{width:100%;height:100%}.pdf-page{background:oklch(97% .012 83);place-items:center;display:grid;overflow:hidden}.pdf-page canvas{max-width:100%;max-height:100%;display:block}.page-error{color:var(--danger);background:var(--paper);margin:auto}.upload-queue{padding:var(--space-2xl) 0;border-bottom:1px solid var(--line)}.section-heading{justify-content:space-between;align-items:end;gap:var(--space-lg);display:flex}.file-picker{background:var(--accent);color:oklch(97% .01 150);cursor:pointer;border-radius:.35rem;align-items:center;min-height:44px;padding:.55rem 1rem;font-weight:750;display:inline-flex}.file-picker input{opacity:0;pointer-events:none;position:absolute}.queue-list{margin:var(--space-xl) 0;gap:0;display:grid}.queue-item{gap:var(--space-md);padding:var(--space-md) 0;border-top:1px solid var(--line);grid-template-columns:minmax(16rem,2fr) minmax(12rem,1fr) auto;align-items:center;display:grid}.queue-item>input,.queue-fields select{border:1px solid var(--line);background:var(--paper);min-height:44px;padding:.5rem}.queue-item p{margin:0}.queue-fields{grid-column:1/3;gap:.4rem;display:flex}.queue-status{justify-self:end}.status-完成{color:var(--accent-dark)}.status-失败{color:var(--danger)}.admin-books{padding-top:var(--space-2xl)}.admin-books ul{padding:0;list-style:none}.admin-books li{justify-content:space-between;align-items:center;gap:var(--space-md);border-bottom:1px solid var(--line);padding:.75rem 0;display:flex}.admin-books li span{display:grid}.admin-books small{color:var(--muted)}.admin-books li button{color:var(--danger);background:0 0}@media (width<=760px){.login-panel{margin-left:0}.library-header{align-items:center}.book-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.reader-toolbar{grid-template-columns:auto 1fr}.reader-actions{grid-column:1/-1;justify-content:center}.reader-stage{height:calc(100svh - 120px)}.toolbar-label{display:none}.queue-item{grid-template-columns:1fr auto}.queue-fields{flex-wrap:wrap;grid-column:1/-1}}@media (pointer:coarse){button,.file-picker{min-height:48px;padding:.7rem 1.1rem}}@media (prefers-reduced-motion:reduce){*,:before,:after{transition-duration:.01ms!important;animation-duration:.01ms!important}}
