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var(--border);display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:6px}.reader-selection-image{display:block;aspect-ratio:1 / 1;overflow:hidden;border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--bg-tertiary)}.reader-selection-image img{width:100%;height:100%;object-fit:cover;display:block}@media(hover:none),(pointer:coarse),(max-width:640px){.reader-selection-menu{left:12px!important;right:12px;top:auto!important;bottom:calc(116px + env(safe-area-inset-bottom));z-index:120;width:auto;max-height:min(42vh,360px);transform:none!important}.reader-selection-text{max-height:84px}.reader-selection-actions{gap:8px}.reader-selection-menu button{height:38px}}.reader-drawer-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;z-index:70;background:#0000002e}.reader-toc-drawer{width:min(360px,86vw);height:100%;padding:0 18px 18px;background:var(--bg);box-shadow:var(--shadow-lg);overflow-y:auto}.reader-drawer-header{position:sticky;top:0;z-index:1;display:flex;align-items:center;justify-content:space-between;gap:12px;margin:0 -18px 16px;padding:calc(18px + env(safe-area-inset-top)) 18px 14px;border-bottom:1px solid rgba(0,0,0,.04);background:#fffffff0;backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px)}.reader-drawer-header h2{font-size:20px}.reader-toc-list{display:flex;flex-direction:column;gap:6px}.reader-toc-list button{display:flex;flex-direction:column;gap:3px;width:100%;padding:11px 12px;border:none;border-radius:var(--radius-sm);background:transparent;color:var(--text-primary);font-family:var(--font);text-align:left;cursor:pointer}.reader-toc-list button:hover,.reader-toc-list button.active{background:var(--accent-light)}.reader-toc-list button:disabled{cursor:default;opacity:.64}.reader-toc-list button:disabled:hover{background:transparent}.reader-toc-node,.reader-toc-children{display:flex;flex-direction:column;gap:4px}.reader-toc-list small{color:var(--text-secondary)}@media(max-width:640px){.library-grid{grid-template-columns:repeat(3,1fr);gap:12px 10px}.library-cell-footer{min-height:24px;margin-top:2px}.library-cell-progress{font-size:11px}.book-finished-badge{width:17px;height:17px;right:4px;bottom:4px}.page-content:has(.admin-page){padding-left:16px;padding-right:16px;overflow-x:hidden}.admin-page .page-title{font-size:24px;margin-bottom:18px}.admin-page section{min-width:0}.admin-page .card{padding:16px;overflow-x:auto!important;-webkit-overflow-scrolling:touch}.admin-page .card[style*="padding: 0"]{padding:0}.admin-form-grid,.admin-form-grid-color,.admin-group-form,.admin-import-grid{grid-template-columns:1fr!important}.admin-form-grid input[type=color],.admin-import-grid .admin-color{width:100%;max-width:112px}.admin-field input{width:100%}.stat-grid{grid-template-columns:repeat(auto-fill,minmax(130px,1fr))}.admin-page .input{min-width:0!important;width:100%}.admin-page input[type=file].input{font-size:13px}.admin-page .btn{max-width:100%}.book-card{grid-template-columns:72px minmax(0,1fr);gap:12px}.book-cover{width:72px}.page-content:has(.reader-shell){padding-left:14px;padding-right:14px}.reader-top-bar{grid-template-columns:auto minmax(0,1fr)}.reader-title-stack{text-align:left}.study-strip,.reader-bottom-bar{max-width:100%}.study-strip{flex-direction:column}.word-list-coverage{grid-template-columns:1fr}.reader-page{padding-left:4px;padding-right:4px}.reader-ai-panel{left:14px;right:14px;width:auto;bottom:calc(126px + env(safe-area-inset-bottom));height:min(680px,calc(100vh - 148px));height:min(680px,calc(100dvh - 148px));max-height:min(620px,calc(100vh - 168px));max-height:min(680px,calc(100dvh - 148px))}.reader-ai-message,.reader-ai-message-row{max-width:92%}.reader-bottom-bar{gap:6px;padding:0 10px}.reader-center-nav{gap:3px;max-width:calc(100vw - 104px);padding:5px}.reader-nav-btn{width:34px;height:34px}.reader-page-nav-btn{width:40px;height:40px}}.error-message{background:#ff3b3014;color:var(--red);padding:12px 16px;border-radius:var(--radius-sm);font-size:14px;margin-bottom:16px}.example-block{background:#34c7590f;border-left:3px solid var(--green);padding:16px;border-radius:0 var(--radius-sm) var(--radius-sm) 0;margin-top:16px}.example-block .label{font-size:12px;font-weight:600;text-transform:uppercase;letter-spacing:.5px;color:var(--green);margin-bottom:8px}.example-block p{font-size:15px;line-height:1.6;color:var(--text-primary)}.example-chevron{transition:transform var(--transition);flex-shrink:0}.example-chevron-expanded{transform:rotate(90deg)}.example-body{overflow:hidden;max-height:2000px;opacity:1;transition:max-height .3s ease,opacity .2s ease}.example-body-collapsed{max-height:0;opacity:0}.improved-block{background:#0071e30f;border-left:3px solid var(--accent);padding:16px;border-radius:0 var(--radius-sm) var(--radius-sm) 0;margin-top:16px}.improved-block .label{font-size:12px;font-weight:600;text-transform:uppercase;letter-spacing:.5px;color:var(--accent);margin-bottom:8px}.improved-block p{font-size:15px;line-height:1.6;color:var(--text-primary)}.textarea-wrapper{position:relative}.mic-btn{position:absolute;bottom:10px;right:10px;width:36px;height:36px;border-radius:50%;border:none;background:var(--bg-secondary);color:var(--text-tertiary);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all var(--transition);z-index:2}.mic-btn:hover{background:var(--bg-tertiary);color:var(--text-secondary)}.mic-btn.recording{background:var(--red);color:#fff;animation:mic-pulse 1.5s ease-in-out infinite}.mic-btn.recording:hover{background:#e0342b;color:#fff}.mic-btn:disabled{opacity:.4;cursor:not-allowed;animation:none}@keyframes mic-pulse{0%,to{box-shadow:0 0 #ff3b3066}50%{box-shadow:0 0 0 8px #ff3b3000}}.recording-indicator{position:absolute;bottom:14px;right:54px;display:flex;align-items:center;gap:8px;z-index:2}.recording-timer{font-size:13px;font-weight:600;font-variant-numeric:tabular-nums;color:var(--text-secondary)}.recording-timer.warning{color:var(--red)}.waveform-canvas{display:block;flex-shrink:0}.play-btn{display:inline-flex;align-items:center;gap:5px;height:26px;padding:0 10px;border:none;border-radius:980px;background:var(--bg-secondary);color:var(--text-tertiary);font-family:var(--font);font-size:11px;font-variant-numeric:tabular-nums;cursor:pointer;transition:all var(--transition);flex-shrink:0}.play-btn:hover{background:var(--bg-tertiary);color:var(--text-secondary)}.play-btn-error{color:#e55}.play-btn-time{color:var(--text-tertiary);font-weight:500;letter-spacing:.01em}.mt-8{margin-top:8px}.mt-12{margin-top:12px}.mt-16{margin-top:16px}.mt-20{margin-top:20px}.mt-24{margin-top:24px}.mb-8{margin-bottom:8px}.mb-12{margin-bottom:12px}.mb-16{margin-bottom:16px}.gap-8{gap:8px}.gap-12{gap:12px}.gap-16{gap:16px}.flex{display:flex}.flex-col{flex-direction:column}.items-center{align-items:center}.justify-between{justify-content:space-between}.text-secondary{color:var(--text-secondary)}.text-small{font-size:13px}