@import url("teacher-session.css");
:root{font-family:system-ui,-apple-system,"Segoe UI","Microsoft YaHei",sans-serif;color:#25324b;background:#f5f7fb;font-synthesis:none;--accent:#2558bd}*{box-sizing:border-box}body{margin:0}button,input{font:inherit}button,a,input{touch-action:manipulation}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.55}button:focus-visible,a:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid #82a6ec;outline-offset:3px}button{min-height:44px;border:1px solid #d5deeb;border-radius:8px;background:white;padding:9px 14px;color:#25324b}button:hover:not(:disabled){background:#f0f4fc}.home-header{display:flex;align-items:center;justify-content:space-between;gap:16px;background:white;border-bottom:1px solid #dfe6f0;padding:18px 4vw}.home-brand{display:flex;align-items:center;gap:12px;color:inherit;text-decoration:none}.brand-mark{display:grid;place-items:center;width:42px;height:42px;background:#2558bd;color:white;border-radius:9px}.brand-mark svg{width:28px;fill:none;stroke:currentColor;stroke-width:1.7}.home-brand strong{font-size:19px;display:block}.home-brand small{font-size:12px;color:#71809a;display:block;margin-top:3px}.header-actions{display:flex;gap:9px}.header-actions #editing-toggle,.primary-button{background:#2558bd;color:white;border-color:#2558bd}.header-actions #editing-toggle:hover,.primary-button:hover{background:#1e4fae}.home-main{max-width:1500px;margin:auto;padding:32px 4vw 45px}.welcome{display:flex;gap:24px;justify-content:space-between;align-items:center;margin-bottom:28px}.eyebrow{font-size:13px;color:#58709a;font-weight:650;margin:0 0 9px}h1{font-size:clamp(24px,3vw,33px);font-weight:700;margin:0 0 10px;letter-spacing:.02em}.intro{margin:0;line-height:1.7;color:#64748d;font-size:15px}.library-summary{display:flex;gap:22px;flex:none;color:#75829a;font-size:12px;text-align:center}.library-summary strong{display:block;font-size:25px;color:#2d4266;margin-bottom:3px}.library-summary .ready strong{color:#2558bd}.edit-notice{display:flex;align-items:center;gap:12px;padding:14px 18px;background:#eaf1fe;border:1px solid #cad9f3;border-radius:9px;margin-bottom:22px;color:#244f9c}.edit-notice[hidden]{display:none}.edit-notice svg{width:25px;fill:none;stroke:currentColor;stroke-width:1.7;flex:none}.edit-notice p{margin:4px 0 0;font-size:14px}.library-controls{display:flex;justify-content:space-between;gap:20px;align-items:center}.grade-tabs{display:flex;gap:5px;border:none;padding:5px;background:#e8edf6;border-radius:9px;margin:0}.grade-tabs input{position:absolute;opacity:0;pointer-events:none}.grade-tabs span{display:block;padding:11px 17px;min-height:44px;font-size:15px;color:#65738e;cursor:pointer;border-radius:6px}.grade-tabs input:checked+span{background:white;color:#2558bd;box-shadow:0 1px 4px #ced7e7;font-weight:650}.grade-tabs input:focus-visible+span{outline:3px solid #82a6ec}.home-search{display:flex;align-items:center;gap:9px;background:white;border:1px solid #d6deeb;border-radius:8px;padding:0 13px;height:46px;min-width:220px;max-width:320px}.home-search svg{width:20px;stroke:#71809a;stroke-width:1.7;fill:none;flex:none}.home-search input{border:none;background:transparent;min-width:0;width:100%;outline:none;font-size:14px}.home-search:focus-within{outline:2px solid #82a6ec}.subject-filters{display:flex;gap:7px;flex-wrap:wrap;margin:18px 0 26px}.subject-filters button{min-height:36px;padding:6px 13px;font-size:14px;border-radius:20px;background:transparent;border-color:transparent;color:#64748d}.subject-filters button[aria-pressed=true]{background:#e9f0ff;color:#2558bd;border-color:#c8d8f4}.list-heading{display:flex;align-items:center;justify-content:space-between;margin-bottom:15px}.list-heading h2{font-size:18px;margin:0}.list-heading span{font-size:13px;color:#73829b}.book-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,300px),1fr));gap:16px}.book-card{background:white;border:1px solid #dce3ee;border-radius:12px;padding:20px;display:flex;flex-direction:column;min-height:236px;box-shadow:0 2px 7px rgb(38 61 98 / .025)}.book-card.is-ready{border-color:#b5c9eb}.book-top{display:flex;align-items:center;justify-content:space-between;gap:10px}.subject-icon{width:40px;height:40px;border-radius:9px;background:#edf3fd;display:grid;place-items:center;color:#3d659e;font-size:18px;font-weight:650}.book-status{font-size:12px;background:#f1f3f7;color:#697a93;padding:5px 8px;border-radius:5px}.is-ready .book-status{background:#e9f3ed;color:#397250}.book-card h3{font-size:19px;margin:15px 0 6px}.book-meta{font-size:13px;color:#76849c;margin:0 0 12px;line-height:1.6}.book-detail{font-size:13px;color:#71809a;line-height:1.65;margin:0 0 15px;min-height:43px}.book-enter{display:block;text-align:center;text-decoration:none;border:1px solid #cad9f2;background:#edf3ff;color:#2558bd;border-radius:7px;padding:10px;margin-top:auto;font-size:14px;font-weight:650;min-height:44px}.book-enter:hover{background:#e0ebff}.book-progress{display:block;margin-top:auto;padding-top:11px;border-top:1px solid #edf0f5;font-size:13px;color:#7a879b}.inventory-note{font-size:13px;line-height:1.8;color:#78869d;margin:22px 0}.home-help{background:white;border:1px solid #dce3ee;border-radius:9px;padding:15px 18px;font-size:14px;color:#5f708b}.home-help summary{cursor:pointer;font-weight:650;color:#435978;min-height:24px}.home-help p{line-height:1.8;overflow-wrap:anywhere}.sr-only,.skip-link:not(:focus){position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%)}.skip-link:focus{display:block;padding:10px;color:#2558bd;background:white}.backup-header{display:flex;justify-content:space-between;align-items:center;gap:12px}.backup-header h2{font-size:20px;margin:0}#backup-dialog{border:1px solid #d7e0ed;border-radius:12px;width:min(620px,calc(100vw - 24px));padding:22px;color:#25324b;max-height:calc(100dvh - 24px)}#backup-dialog::backdrop{background:rgb(21 34 56 / .35)}#backup-dialog p{line-height:1.8;font-size:14px;color:#64748d}#backup-dialog hr{border:0;border-top:1px solid #e0e6ef;margin:22px 0}.restore-label{display:block;margin-bottom:12px;font-size:14px}#backup-file{width:100%;font-size:14px;margin-bottom:14px}#restore-preview{font-size:14px;margin-bottom:14px;color:#4f6586;white-space:pre-line}#home-status{position:fixed;bottom:15px;left:50%;transform:translateX(-50%);background:#243958;color:white;padding:12px 18px;border-radius:7px;max-width:calc(100vw - 24px);display:none;font-size:14px}@media(max-width:740px){.home-header{padding:12px 16px;flex-wrap:wrap}.home-brand small{display:none}.header-actions{margin-left:auto}.header-actions button{padding:8px 10px;font-size:13px}.home-main{padding:24px 16px}.welcome{align-items:flex-start;flex-direction:column;gap:18px;margin-bottom:22px}.library-summary{gap:25px;text-align:left}.library-summary strong{font-size:21px}.library-controls{align-items:stretch;flex-direction:column;gap:12px}.home-search{max-width:none;width:100%}.grade-tabs span{padding:10px 11px}.grade-tabs{justify-content:space-between}.subject-filters{margin:16px 0 22px}.book-card{padding:18px;min-height:218px}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}