:root{--primary:#4f46e5;--primary2:#7c3aed;--bg:#f6f7fb;--surface:#fff;--text:#172033;--muted:#738096;--border:#e8eaf1;--danger:#dc2626;--success:#059669;--shadow:0 16px 45px rgba(36,43,71,.08);--radius:18px}html[data-theme=emerald]{--primary:#059669;--primary2:#14b8a6}html[data-theme=orange]{--primary:#ea580c;--primary2:#f59e0b}html[data-theme=blue]{--primary:#2563eb;--primary2:#0ea5e9}html[data-theme=purple]{--primary:#7e22ce;--primary2:#a855f7}html[data-theme=teal]{--primary:#0f766e;--primary2:#06b6d4}html[data-theme=rose]{--primary:#e11d48;--primary2:#ec4899}html[data-theme=red]{--primary:#dc2626;--primary2:#f97316}html[data-theme=slate]{--primary:#334155;--primary2:#64748b}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif;background:var(--bg);color:var(--text);line-height:1.55}a{text-decoration:none;color:inherit}button,input,select,textarea{font:inherit}button{cursor:pointer}img{max-width:100%}.muted{color:var(--muted)}.dark{--bg:#0d1220;--surface:#151c2d;--text:#edf2ff;--muted:#9ba8bf;--border:#273149;--shadow:0 16px 45px rgba(0,0,0,.25)}.brand{display:flex;align-items:center;gap:12px}.brand span:last-child{display:flex;flex-direction:column;line-height:1.2}.brand small{font-size:11px;color:var(--muted);margin-top:4px}.brand img{width:42px;height:42px;object-fit:contain}.brand-mark{width:44px;height:44px;border-radius:13px;display:grid;place-items:center;background:linear-gradient(135deg,var(--primary),var(--primary2));color:#fff;font-weight:900;box-shadow:0 8px 20px color-mix(in srgb,var(--primary) 30%,transparent)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:1px solid transparent;border-radius:12px;padding:10px 16px;font-weight:750;background:var(--surface);color:var(--text);transition:.2s}.btn:hover{transform:translateY(-1px)}.btn.primary{background:linear-gradient(135deg,var(--primary),var(--primary2));color:#fff;box-shadow:0 10px 24px color-mix(in srgb,var(--primary) 25%,transparent)}.btn.ghost{border-color:var(--border);background:var(--surface)}.btn.light{background:#fff;color:var(--primary)}.btn.glass{background:rgba(255,255,255,.15);border-color:rgba(255,255,255,.3);color:#fff}.btn.google{border-color:var(--border);margin-top:12px}.btn.danger{background:#fee2e2;color:#b91c1c}.btn.tiny{padding:6px 9px;border-radius:8px;font-size:12px}.btn.lg{padding:14px 22px;border-radius:14px}.btn.full{width:100%}.app-shell{display:grid;grid-template-columns:270px 1fr;min-height:100vh}.sidebar{background:var(--surface);border-right:1px solid var(--border);padding:24px 18px;position:sticky;top:0;height:100vh;overflow:auto;z-index:30}.sidebar>.brand{padding:0 10px 24px}.sidebar nav{display:flex;flex-direction:column;gap:5px}.sidebar nav a{display:flex;align-items:center;gap:13px;padding:11px 13px;border-radius:12px;color:var(--muted);font-weight:650}.sidebar nav a:hover,.sidebar nav a.active{background:color-mix(in srgb,var(--primary) 10%,var(--surface));color:var(--primary)}.nav-label{font-size:10px;font-weight:850;letter-spacing:.12em;color:var(--muted);padding:20px 13px 6px}.main{min-width:0}.topbar{height:82px;display:flex;align-items:center;gap:16px;padding:0 28px;background:color-mix(in srgb,var(--surface) 88%,transparent);backdrop-filter:blur(18px);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:20}.topbar h1{font-size:19px;margin:0}.topbar small{color:var(--muted)}.top-actions{margin-left:auto;display:flex;align-items:center;gap:10px}.icon-btn{width:40px;height:40px;border:1px solid var(--border);border-radius:11px;background:var(--surface);color:var(--text);display:grid;place-items:center}.profile-chip{display:flex;align-items:center;gap:10px;padding:6px 10px;border:1px solid var(--border);border-radius:14px;background:var(--surface)}.profile-chip>span,.profile-chip img{width:34px;height:34px;border-radius:10px;object-fit:cover;display:grid;place-items:center;background:linear-gradient(135deg,var(--primary),var(--primary2));color:#fff;font-weight:800}.profile-chip div{display:flex;flex-direction:column;line-height:1.2}.profile-chip small{font-size:11px}.content{padding:28px;max-width:1600px;margin:0 auto}.welcome-card{background:linear-gradient(135deg,var(--primary),var(--primary2));color:#fff;border-radius:24px;padding:34px 38px;display:flex;justify-content:space-between;align-items:center;min-height:210px;box-shadow:var(--shadow);overflow:hidden}.welcome-card h2{font-size:32px;margin:5px 0}.welcome-card p{max-width:650px;color:rgba(255,255,255,.82)}.welcome-art{font-size:90px;filter:drop-shadow(0 20px 20px rgba(0,0,0,.15));transform:rotate(-7deg)}.eyebrow{font-size:11px;letter-spacing:.14em;font-weight:900;color:var(--primary);margin:0}.welcome-card .eyebrow{color:#fff}.stat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin:22px 0}.stat-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:20px;display:flex;align-items:center;gap:15px;box-shadow:var(--shadow)}.stat-card>span{width:46px;height:46px;border-radius:14px;background:color-mix(in srgb,var(--primary) 12%,var(--surface));color:var(--primary);display:grid;place-items:center;font-size:22px}.stat-card div{display:flex;flex-direction:column}.stat-card small{color:var(--muted)}.stat-card b{font-size:25px}.two-col{display:grid;grid-template-columns:2fr 1fr;gap:22px;margin-top:22px}.wide-left{grid-template-columns:1.5fr 1fr}.panel{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow)}.panel h2,.panel h3{margin-top:0}.panel-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:15px}.panel-head h2{margin:0;font-size:18px}.panel-head a,.panel-head span{font-size:12px;color:var(--primary);font-weight:750}.mini-books{display:flex;flex-direction:column}.mini-books a{display:grid;grid-template-columns:48px 1fr 24px;gap:12px;align-items:center;padding:12px 0;border-bottom:1px solid var(--border)}.mini-books a:last-child{border:0}.mini-cover{width:44px;height:54px;border-radius:8px;display:grid;place-items:center;background:linear-gradient(135deg,var(--primary),var(--primary2));color:white;font-weight:850}.mini-books div:nth-child(2){display:flex;flex-direction:column}.mini-books small{color:var(--muted)}.quick-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.quick-grid a{min-height:110px;border:1px solid var(--border);border-radius:14px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;font-size:26px;color:var(--primary)}.quick-grid span{font-size:13px;color:var(--text);font-weight:700}.page-head{display:flex;justify-content:space-between;align-items:end}.filter-bar,.search-panel{display:flex;gap:10px;margin:20px 0}.filter-bar input,.search-panel input{flex:1}.book-grid{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:20px}.book-card{background:var(--surface);border:1px solid var(--border);border-radius:18px;overflow:hidden;transition:.25s;box-shadow:var(--shadow)}.book-card:hover{transform:translateY(-5px)}.book-cover{aspect-ratio:3/4;background:linear-gradient(145deg,var(--primary),var(--primary2));position:relative;display:flex;flex-direction:column;justify-content:center;align-items:center;color:#fff;text-align:center;padding:18px;overflow:hidden}.book-cover img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}.book-cover>span{font-size:48px;font-weight:950;letter-spacing:-.08em}.book-cover>small{font-weight:800;margin-top:8px;position:relative}.book-cover>i{position:absolute;left:10px;top:10px;background:rgba(0,0,0,.45);padding:4px 8px;border-radius:7px;font-size:9px;font-style:normal}.book-card-body{padding:15px}.book-card-body>small{color:var(--primary);font-weight:750;font-size:10px}.book-card h3{font-size:15px;line-height:1.35;margin:7px 0}.book-card p{margin:0;color:var(--muted);font-size:12px}.book-card-body>div{display:flex;justify-content:space-between;margin-top:12px;font-size:11px;color:var(--muted)}.subject-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.subject-card{--subject:var(--primary);background:var(--surface);border:1px solid var(--border);border-radius:18px;padding:22px;display:flex;align-items:center;gap:16px;box-shadow:var(--shadow)}.subject-card>span{width:52px;height:52px;border-radius:15px;background:color-mix(in srgb,var(--subject) 14%,var(--surface));color:var(--subject);display:grid;place-items:center;font-size:25px}.subject-card h3,.subject-card p{margin:0}.subject-card p{color:var(--muted);font-size:12px}.subject-card>b{margin-left:auto;color:var(--subject)}.book-detail{display:grid;grid-template-columns:250px 1fr;gap:32px;background:var(--surface);border:1px solid var(--border);border-radius:24px;padding:28px;box-shadow:var(--shadow)}.book-cover.xl{width:230px;border-radius:17px}.book-info h1{font-size:34px;line-height:1.15;margin:12px 0}.pill,.status,.role-badge{display:inline-flex;padding:5px 9px;border-radius:999px;background:color-mix(in srgb,var(--primary) 12%,var(--surface));color:var(--primary);font-size:10px;font-weight:800;text-transform:uppercase}.byline,.description{color:var(--muted)}.meta-row{display:flex;flex-wrap:wrap;gap:18px;padding:15px 0;border-block:1px solid var(--border);font-size:12px}.progress-box{margin-top:22px}.progress-box>div:first-child{display:flex;justify-content:space-between}.progress{height:8px;background:var(--border);border-radius:99px;overflow:hidden;margin-top:8px}.progress i{display:block;height:100%;background:linear-gradient(90deg,var(--primary),var(--primary2));border-radius:inherit}.chapter-list a,.chapter-static{display:flex;align-items:center;gap:15px;padding:14px 0;border-bottom:1px solid var(--border)}.chapter-list>a>span,.chapter-static>span{width:34px;height:34px;border-radius:9px;background:color-mix(in srgb,var(--primary) 10%,var(--surface));color:var(--primary);display:grid;place-items:center;font-size:11px;font-weight:850}.chapter-list a div,.chapter-static div{display:flex;flex-direction:column}.chapter-list a small,.chapter-static small{color:var(--muted)}.chapter-list a>b{margin-left:auto}.info-list{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:0}.info-list dt{color:var(--muted)}.info-list dd{margin:0;text-align:right;font-weight:700}.reader{margin:-28px;min-height:calc(100vh - 82px);background:#e9ecf3}.reader-toolbar{height:62px;background:#172033;color:#fff;display:flex;align-items:center;gap:10px;padding:0 16px}.reader-toolbar .icon-btn{background:#283147;border-color:#39445e;color:#fff}.reader-title{display:flex;flex-direction:column;flex:1}.reader-title small{color:#aeb8cb}.reader-layout{display:grid;grid-template-columns:240px 1fr 260px;height:calc(100vh - 144px)}.reader-toc,.reader-notes{background:var(--surface);padding:18px;overflow:auto}.reader-toc{border-right:1px solid var(--border)}.reader-notes{border-left:1px solid var(--border)}.reader-toc a{display:block;padding:10px;border-radius:9px;color:var(--muted);font-size:12px}.reader-toc a.active{background:color-mix(in srgb,var(--primary) 12%,var(--surface));color:var(--primary);font-weight:750}.reader-toc .btn{margin-top:8px}.reader-stage{overflow:auto;padding:32px}.reader-paper{max-width:920px;min-height:100%;margin:0 auto;background:#fff;color:#172033;box-shadow:0 18px 60px rgba(0,0,0,.15);transition:.2s}.reader-dark .reader-stage{background:#0b0e14}.reader-dark .reader-paper{filter:invert(.88) hue-rotate(180deg)}.chapter-content{padding:65px 75px;font-family:Georgia,serif;font-size:18px;line-height:1.9}.chapter-content h1{font-size:36px}.pdf-frame{width:100%;height:calc(100vh - 210px);border:0}.media-player{width:100%;max-height:75vh;background:#000}.audio-reader{padding:60px}.audio-reader audio{width:100%}.reader-notes article{border:1px solid var(--border);border-radius:10px;padding:10px;margin-bottom:10px}.reader-notes p{font-size:12px}.form-panel summary{font-weight:800;cursor:pointer}.form-panel[open] summary{margin-bottom:20px}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:15px}.stack-form{display:flex;flex-direction:column;gap:14px}.span-2{grid-column:span 2}label{display:flex;flex-direction:column;gap:6px;font-size:12px;font-weight:700;color:var(--muted)}input,select,textarea{width:100%;border:1px solid var(--border);background:var(--surface);color:var(--text);border-radius:11px;padding:11px 12px;outline:none}input:focus,select:focus,textarea:focus{border-color:var(--primary);box-shadow:0 0 0 3px color-mix(in srgb,var(--primary) 12%,transparent)}textarea{min-height:100px;resize:vertical}.table-wrap{overflow:auto}table{width:100%;border-collapse:collapse;font-size:12px}th{text-align:left;color:var(--muted);font-size:10px;text-transform:uppercase;letter-spacing:.08em}th,td{padding:12px;border-bottom:1px solid var(--border);vertical-align:top}.actions{display:flex;gap:5px}.status.published{background:#dcfce7;color:#15803d}.status.draft{background:#fef3c7;color:#b45309}.role-badge.admin{background:#ede9fe;color:#6d28d9}.role-badge.teacher{background:#dbeafe;color:#1d4ed8}.role-badge.student{background:#dcfce7;color:#15803d}.role-badge.principal{background:#ffedd5;color:#c2410c}.card-list{display:flex;flex-direction:column;gap:14px}.list-card{background:var(--surface);border:1px solid var(--border);border-radius:16px;padding:18px;display:flex;align-items:center;gap:16px;box-shadow:var(--shadow)}.list-card>div{flex:1}.list-card h3,.list-card p{margin:2px 0}.list-card small,.list-card p{color:var(--muted)}.list-icon{width:48px;height:48px;border-radius:14px;background:color-mix(in srgb,var(--primary) 12%,var(--surface));display:grid;place-items:center;color:var(--primary);font-size:22px}.deadline{font-size:11px;color:#dc2626}.modal{border:0;border-radius:18px;padding:24px;background:var(--surface);color:var(--text);max-width:550px;width:90%;box-shadow:0 25px 80px rgba(0,0,0,.25)}.modal::backdrop{background:rgba(13,18,32,.65)}.grade-form{display:grid;grid-template-columns:70px 1fr auto;gap:5px}.quiz-form{max-width:900px;margin:0 auto}.quiz-top{display:flex;justify-content:space-between;align-items:start;background:linear-gradient(135deg,var(--primary),var(--primary2));color:#fff;padding:28px;border-radius:20px;margin-bottom:18px}.quiz-top .eyebrow{color:#fff}.timer{background:rgba(255,255,255,.15);padding:12px 16px;border-radius:12px}.question-card{background:var(--surface);border:1px solid var(--border);border-radius:18px;padding:24px;margin-bottom:16px}.question-number{display:flex;justify-content:space-between;color:var(--primary);font-size:11px;font-weight:850}.answer-options{display:grid;gap:10px}.answer-options label{flex-direction:row;align-items:center;border:1px solid var(--border);padding:12px;border-radius:11px;color:var(--text)}.answer-options input{width:auto}.result-card{text-align:center;background:var(--surface);border:1px solid var(--border);border-radius:24px;padding:50px;max-width:620px;margin:40px auto;box-shadow:var(--shadow)}.score-ring{width:170px;height:170px;border-radius:50%;margin:0 auto 20px;display:flex;flex-direction:column;align-items:center;justify-content:center;background:conic-gradient(var(--primary) calc(var(--score)*1%),var(--border) 0);position:relative}.score-ring:before{content:"";position:absolute;inset:13px;background:var(--surface);border-radius:50%}.score-ring b,.score-ring small{position:relative}.score-ring b{font-size:44px}.announcement-list{display:grid;gap:14px}.announcement-list article{display:flex;gap:16px;background:var(--surface);border:1px solid var(--border);border-radius:16px;padding:20px}.announcement-list article>span{color:var(--primary)}.announcement-list h3,.announcement-list p{margin:3px 0}.announcement-list small{color:var(--muted)}.progress-item{display:grid;grid-template-columns:1fr auto;gap:5px;padding:13px 0;border-bottom:1px solid var(--border)}.progress-item>div{display:flex;flex-direction:column}.progress-item small{color:var(--muted)}.progress-item .progress{grid-column:span 2}.rank-list>div{display:grid;grid-template-columns:35px 1fr;gap:2px 10px;padding:12px 0;border-bottom:1px solid var(--border)}.rank-list>div>span{grid-row:span 2;width:30px;height:30px;border-radius:8px;display:grid;place-items:center;background:color-mix(in srgb,var(--primary) 12%,var(--surface));color:var(--primary);font-weight:850}.rank-list small{color:var(--muted)}.profile-layout{display:grid;grid-template-columns:320px 1fr;gap:22px}.profile-summary{text-align:center}.profile-summary img,.avatar-xl{width:120px;height:120px;border-radius:30px;object-fit:cover;margin:0 auto 15px}.avatar-xl{display:grid;place-items:center;background:linear-gradient(135deg,var(--primary),var(--primary2));color:#fff;font-size:44px;font-weight:900}.profile-summary .info-list{margin-top:25px;text-align:left}.settings-grid{display:grid;grid-template-columns:1fr 1fr;gap:22px}.backup-list{display:flex;flex-direction:column;gap:5px}.backup-list a{color:var(--primary);font-size:12px}.sync-actions{display:grid;grid-template-columns:auto auto 1fr;gap:10px;margin-top:18px}.sync-actions pre{grid-column:1/-1;background:#101725;color:#c7d2fe;padding:14px;border-radius:12px;white-space:pre-wrap;max-height:260px;overflow:auto}.empty-state{text-align:center;padding:50px;background:var(--surface);border:1px dashed var(--border);border-radius:18px;grid-column:1/-1}.public-header{height:78px;display:flex;align-items:center;padding:0 6vw;background:rgba(255,255,255,.9);backdrop-filter:blur(15px);border-bottom:1px solid #eceef4;position:sticky;top:0;z-index:30}.public-header .brand{margin-right:auto}.public-header nav{display:flex;gap:28px;margin-right:30px;font-size:13px;font-weight:700;color:#4b5563}.hero{min-height:660px;display:grid;grid-template-columns:1.1fr .9fr;align-items:center;padding:70px 7vw;background:radial-gradient(circle at 80% 20%,#ddd6fe 0,transparent 35%),linear-gradient(180deg,#fff,#f4f5ff)}.hero h1{font-size:64px;line-height:1.05;letter-spacing:-.05em;margin:14px 0;color:#111827}.hero h1 em{font-style:normal;background:linear-gradient(90deg,var(--primary),var(--primary2));-webkit-background-clip:text;color:transparent}.hero-copy>p{font-size:18px;color:#64748b;max-width:650px}.hero-actions{display:flex;gap:12px;margin:22px 0}.hero-search{display:flex;background:#fff;border-radius:15px;padding:7px;max-width:620px;box-shadow:0 20px 50px rgba(47,54,90,.13)}.hero-search input{border:0;background:#fff;color:#111827}.hero-search button{width:45px;border:0;border-radius:11px;background:var(--primary);color:#fff;font-size:22px}.hero-visual{display:grid;place-items:center}.book-stack{position:relative;width:420px;height:430px}.book{position:absolute;width:250px;height:340px;border-radius:12px 24px 24px 12px;padding:30px;color:#fff;font-weight:900;font-size:24px;line-height:1.15;box-shadow:15px 28px 50px rgba(40,42,78,.25);display:flex;flex-direction:column;justify-content:flex-end}.book small{font-size:12px;margin-top:12px}.b1{background:linear-gradient(145deg,#4f46e5,#7c3aed);transform:rotate(-8deg);left:0;top:60px}.b2{background:linear-gradient(145deg,#059669,#14b8a6);transform:rotate(5deg);right:0;top:20px}.b3{background:linear-gradient(145deg,#ea580c,#f59e0b);transform:rotate(-1deg);left:90px;top:80px}.public-stats{display:grid;grid-template-columns:repeat(4,1fr);padding:30px 8vw;background:#111827;color:#fff}.public-stats div{text-align:center;border-right:1px solid rgba(255,255,255,.15)}.public-stats div:last-child{border:0}.public-stats b{display:block;font-size:31px}.public-stats span{font-size:12px;color:#94a3b8}.public-section{padding:75px 7vw;background:#fff}.section-head{display:flex;justify-content:space-between;align-items:end;margin-bottom:28px}.section-head h2{font-size:34px;margin:6px 0}.section-head>a{color:var(--primary);font-weight:750}.help-band{padding:65px 8vw;text-align:center;background:linear-gradient(135deg,var(--primary),var(--primary2));color:#fff}.help-band h2{font-size:34px;margin:0}.help-band p{color:rgba(255,255,255,.8)}.library-public{min-height:70vh}.login-wrap{min-height:calc(100vh - 78px);display:grid;grid-template-columns:1fr 500px;background:#f4f6fb}.login-art{background:linear-gradient(135deg,#312e81,#7c3aed);color:#fff;padding:12vh 8vw}.login-art .eyebrow{color:#c4b5fd}.login-art h2{font-size:48px;max-width:650px;line-height:1.15}.mini-features{display:grid;gap:13px;color:#ddd6fe}.login-card{background:#fff;padding:60px;display:flex;flex-direction:column;justify-content:center;color:#172033}.login-card h1{margin-bottom:3px}.login-card label{color:#64748b}.login-card input{background:#fff;color:#172033;border-color:#dfe3ec}.demo-credentials{margin-top:20px;background:#f4f5ff;border:1px dashed #c7d2fe;padding:14px;border-radius:12px;font-size:11px;color:#475569}.install-body{min-height:100vh;display:grid;place-items:center;background:radial-gradient(circle at 20% 10%,#ddd6fe,transparent 35%),#f4f6fb;padding:30px}.install-card{width:min(760px,100%);background:#fff;padding:35px;border-radius:24px;box-shadow:0 30px 80px rgba(50,55,90,.15);color:#172033}.install-card h1{margin-bottom:0}.install-card input,.install-card select,.install-card textarea{background:#fff;color:#172033;border-color:#dfe3ec}.alert{padding:13px;border-radius:11px;margin:12px 0}.alert.error{background:#fee2e2;color:#991b1b}.alert.success{background:#dcfce7;color:#166534}.toast{position:fixed;right:22px;top:22px;z-index:100;padding:13px 18px;border-radius:12px;box-shadow:0 15px 40px rgba(0,0,0,.2);color:#fff}.toast.success{background:#059669}.toast.error{background:#dc2626}code{background:var(--border);padding:2px 5px;border-radius:5px}@media(max-width:1200px){.book-grid{grid-template-columns:repeat(4,1fr)}.reader-layout{grid-template-columns:210px 1fr}.reader-notes{display:none}}@media(max-width:980px){.management-tools{grid-template-columns:1fr}.theme-picker{grid-template-columns:repeat(2,1fr)}.app-shell{grid-template-columns:1fr}.sidebar{position:fixed;left:-290px;transition:.25s}.sidebar.open{left:0}.book-grid{grid-template-columns:repeat(3,1fr)}.stat-grid{grid-template-columns:1fr 1fr}.two-col,.profile-layout,.settings-grid{grid-template-columns:1fr}.hero{grid-template-columns:1fr;padding-top:50px}.hero-visual{display:none}.login-wrap{grid-template-columns:1fr}.login-art{display:none}.public-header nav{display:none}.subject-grid{grid-template-columns:1fr 1fr}.reader-layout{grid-template-columns:1fr}.reader-toc{display:none}.book-detail{grid-template-columns:180px 1fr}.book-cover.xl{width:170px}}@media(max-width:640px){.import-summary{grid-template-columns:1fr 1fr}.theme-picker{grid-template-columns:1fr 1fr}.content{padding:16px}.topbar{padding:0 15px}.profile-chip div{display:none}.welcome-card{padding:25px}.welcome-card h2{font-size:25px}.welcome-art{display:none}.stat-grid{grid-template-columns:1fr 1fr;gap:10px}.stat-card{padding:14px}.stat-card b{font-size:19px}.book-grid{grid-template-columns:1fr 1fr;gap:12px}.book-card-body{padding:11px}.subject-grid{grid-template-columns:1fr}.book-detail{grid-template-columns:1fr}.book-cover.xl{width:170px;margin:auto}.book-info h1{font-size:27px}.two-col{grid-template-columns:1fr}.form-grid{grid-template-columns:1fr}.span-2{grid-column:span 1}.filter-bar,.search-panel{flex-direction:column}.reader{margin:-16px}.reader-toolbar{overflow:auto}.reader-stage{padding:8px}.chapter-content{padding:35px 25px}.public-header{padding:0 20px}.public-header .brand small{display:none}.hero{min-height:600px;padding:50px 24px}.hero h1{font-size:45px}.public-stats{grid-template-columns:1fr 1fr;gap:20px;padding:25px}.public-stats div{border:0}.public-section{padding:50px 20px}.public-section .book-grid{grid-template-columns:1fr 1fr}.login-card{padding:35px 22px}.sync-actions{grid-template-columns:1fr}.settings-grid .span-2{grid-column:auto}}

.management-tools{display:grid;grid-template-columns:1fr 1fr;gap:22px;margin-bottom:22px}.template-links{display:flex;flex-wrap:wrap;gap:8px;margin:14px 0}.import-form small{font-weight:500;color:var(--muted)}.import-report{margin-bottom:22px}.import-summary{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}.import-summary>div{border:1px solid var(--border);border-radius:14px;padding:16px;background:color-mix(in srgb,var(--primary) 5%,var(--surface));display:flex;flex-direction:column}.import-summary b{font-size:25px;color:var(--primary)}.import-summary span{font-size:11px;color:var(--muted)}.import-summary .has-error{background:#fff1f2;border-color:#fecdd3}.import-summary .has-error b{color:#dc2626}.import-errors{margin-top:15px;border-top:1px solid var(--border);padding-top:12px}.import-errors summary{font-weight:800;color:#dc2626;cursor:pointer}.import-errors ol{max-height:240px;overflow:auto;font-size:12px;color:var(--muted)}.field-label{display:block;font-size:12px;font-weight:700;color:var(--muted);margin-bottom:8px}.theme-picker{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.theme-option{position:relative;border:1px solid var(--border);border-radius:14px;padding:11px;display:flex;align-items:center;gap:9px;cursor:pointer;color:var(--text);transition:.2s}.theme-option:hover,.theme-option.selected{border-color:var(--primary);box-shadow:0 0 0 3px color-mix(in srgb,var(--primary) 12%,transparent)}.theme-option input{position:absolute;opacity:0;pointer-events:none}.theme-swatch{width:38px;height:38px;border-radius:11px;background:linear-gradient(135deg,var(--swatch1),var(--swatch2));box-shadow:inset 0 0 0 1px rgba(255,255,255,.3)}.theme-option small{font-size:10px;font-weight:800;color:var(--text)}.custom-colors input[type=color]{height:46px;padding:4px}.custom-colors code{display:block;text-align:center;margin-top:5px}.check-label{flex-direction:row;align-items:center;color:var(--text)}.check-label input[type=checkbox]{width:auto}.theme-preview{display:flex;align-items:center;gap:12px;border:1px solid var(--border);border-radius:16px;padding:14px;background:linear-gradient(135deg,color-mix(in srgb,var(--primary) 8%,var(--surface)),color-mix(in srgb,var(--primary2) 8%,var(--surface)))}.theme-preview>span{width:43px;height:43px;border-radius:13px;display:grid;place-items:center;background:linear-gradient(135deg,var(--primary),var(--primary2));color:#fff;font-weight:900}.theme-preview>div{display:flex;flex-direction:column;flex:1}.theme-preview small{color:var(--muted)}


/* ===== Secure Quiz Upgrade ===== */
.secure-quiz-shell{display:grid;gap:1.5rem}
.quiz-launch-card,.secure-lock-screen{background:linear-gradient(135deg,#243348,#556581);color:#fff;border-radius:28px;padding:2rem;box-shadow:0 24px 60px rgba(15,23,42,.18)}
.quiz-launch-card h1,.secure-lock-screen h2{margin:.5rem 0 1rem;font-size:clamp(1.8rem,3vw,2.6rem)}
.quiz-launch-card p,.secure-lock-screen p{color:rgba(255,255,255,.88)}
.launch-meta{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:1rem;margin:1.5rem 0}
.launch-meta div{background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.12);padding:1rem 1.1rem;border-radius:20px}
.launch-meta small{display:block;color:rgba(255,255,255,.7);margin-bottom:.25rem}
.secure-rules{margin:1.25rem 0 1.5rem;padding-left:1.2rem;display:grid;gap:.55rem}
.secure-rules li{color:rgba(255,255,255,.92)}
.secure-quiz{display:grid;gap:1rem}
.secure-quiz-header{position:sticky;top:1rem;z-index:30;display:flex;justify-content:space-between;align-items:flex-start;gap:1rem;padding:1.2rem 1.4rem;border-radius:24px;background:#fff;border:1px solid rgba(148,163,184,.2);box-shadow:0 20px 40px rgba(15,23,42,.08)}
.quiz-title-wrap{max-width:60ch}
.quiz-title-wrap h2{margin:.25rem 0 .6rem;font-size:clamp(1.35rem,2vw,2rem)}
.quiz-title-wrap p{margin:0;color:var(--muted,#64748b)}
.quiz-top-actions{display:flex;align-items:stretch;flex-wrap:wrap;gap:.75rem;justify-content:flex-end}
.quiz-stat-box{min-width:110px;padding:.85rem 1rem;border-radius:18px;background:#f8fafc;border:1px solid rgba(148,163,184,.18)}
.quiz-stat-box.warning{background:#fff7ed;border-color:#fdba74}
.quiz-stat-box small{display:block;color:#64748b;font-size:.76rem;text-transform:uppercase;letter-spacing:.06em}
.quiz-stat-box b{display:block;margin-top:.2rem;font-size:1.2rem}
.secure-quiz-nav{position:sticky;top:8.9rem;z-index:25;background:#fff;border:1px solid rgba(148,163,184,.18);border-radius:24px;padding:1rem 1.2rem;box-shadow:0 18px 34px rgba(15,23,42,.05)}
.nav-header{display:flex;justify-content:space-between;gap:1rem;align-items:center;margin-bottom:.9rem}
.nav-header small{display:block;color:#64748b}
.nav-badge{display:inline-flex;align-items:center;gap:.35rem;padding:.55rem .9rem;border-radius:999px;background:#eff6ff;color:#1d4ed8;font-weight:700;font-size:.85rem}
.question-palette{display:grid;grid-template-columns:repeat(auto-fill,minmax(44px,1fr));gap:.6rem}
.palette-btn{height:44px;border-radius:14px;border:1px solid #cbd5e1;background:#f8fafc;color:#0f172a;font-weight:800;cursor:pointer;transition:.2s ease}
.palette-btn.todo{background:#fff1f2;border-color:#fda4af;color:#be123c}
.palette-btn.done{background:#ecfdf5;border-color:#86efac;color:#166534}
.palette-btn:hover{transform:translateY(-2px)}
.quiz-question-stack{display:grid;gap:1rem}
.secure-question{scroll-margin-top:13.5rem;border:1px solid rgba(148,163,184,.18);box-shadow:0 18px 36px rgba(15,23,42,.05)}
.secure-question.is-answered{border-color:#86efac;background:linear-gradient(180deg,#ffffff 0,#f0fdf4 100%)}
.secure-question.is-unanswered{border-color:#fecdd3;background:linear-gradient(180deg,#ffffff 0,#fff7f7 100%)}
.secure-question h3{margin:.35rem 0 1rem;font-size:1.14rem;line-height:1.55}
.answer-options{display:grid;gap:.8rem}
.answer-options label{display:flex;gap:.8rem;align-items:flex-start;padding:1rem 1rem;border:1px solid rgba(148,163,184,.18);border-radius:16px;background:#fff;cursor:pointer;transition:.2s ease}
.answer-options label.selected{border-color:var(--primary);box-shadow:0 0 0 3px color-mix(in srgb,var(--primary) 15%,transparent)}
.answer-options input[type="radio"]{margin-top:.25rem}
.secure-question input[type="text"],.secure-question input:not([type]),.secure-question textarea,.secure-question input[name^="q_"]{width:100%;padding:1rem 1rem;border-radius:16px;border:1px solid rgba(148,163,184,.28);background:#fff}
.quiz-overlay{position:fixed;inset:0;background:rgba(15,23,42,.72);display:grid;place-items:center;z-index:1000;padding:1.5rem}
.overlay-card{max-width:520px;background:#fff;border-radius:28px;padding:2rem;text-align:center;box-shadow:0 30px 80px rgba(15,23,42,.4)}
.lock-icon{font-size:3rem;margin-bottom:1rem}
.secure-lock-screen{text-align:center}
.quiz-monitor table td small{display:block;color:#64748b;margin-top:.25rem}
.status-pill{display:inline-flex;align-items:center;padding:.3rem .65rem;border-radius:999px;font-size:.8rem;font-weight:800}
.status-pill.locked{background:#fee2e2;color:#b91c1c}
.status-pill.active{background:#dcfce7;color:#166534}
.status-pill.pending{background:#e0f2fe;color:#075985}
.status-pill.submitted{background:#ede9fe;color:#5b21b6}
.inline-form{display:inline}
.secure-quiz.locked{pointer-events:none;opacity:.75}
@media (max-width: 980px){
  .secure-quiz-header{top:.5rem;flex-direction:column}
  .secure-quiz-nav{top:auto;position:relative}
  .secure-question{scroll-margin-top:2rem}
}
@media (max-width: 640px){
  .quiz-launch-card,.secure-lock-screen{padding:1.35rem}
  .secure-quiz-header{padding:1rem}
  .quiz-top-actions{width:100%}
  .quiz-stat-box{flex:1 1 calc(50% - .75rem)}
  .question-palette{grid-template-columns:repeat(auto-fill,minmax(40px,1fr))}
}