:root{--color-primary: #3380f7;--color-primary-hover: #2563eb;--color-primary-soft: #eff6ff;--color-bg-page: #fdfbf7;--color-bg-surface: #ffffff;--color-bg-muted: #f3f4f6;--color-text: #111827;--color-text-secondary: #6b7280;--color-text-tertiary: #9ca3af;--color-border: #e5e7eb;--shadow-sm: 0 1px 3px rgb(0 0 0 / 6%);--shadow-md: 0 2px 12px rgb(0 0 0 / 6%);--color-success: #166534;--color-success-bg: #dcfce7;--color-danger: #991b1b;--color-danger-bg: #fee2e2;--color-warning-bg: #fffbeb;--color-warning-border: #fde68a;--color-warning-text: #92400e;--color-boy: #73a0d9;--color-girl: #d9a6bf;--radius-sm: 8px;--radius-md: 12px;--radius-lg: 16px;--text-display: 2rem;--text-h1: 1.75rem;--text-h2: 1.375rem;--text-h3: 1.25rem;--text-body: 1.0625rem;--text-body-lg: 1.25rem;--text-body-xl: 1.5rem;--text-caption: .9375rem;--text-label: .9375rem;--shell-max-width: 960px;--shell-padding-x: 24px;--follow-panel-width: 480px}@media(max-width:1023px){:root{--shell-max-width: 720px;--shell-padding-x: 20px;--follow-panel-width: 440px}}@media(max-width:767px){:root{--shell-max-width: 100%;--shell-padding-x: 16px;--text-h1: 1.625rem;--text-body-xl: 1.375rem;--follow-panel-width: 100%}}:root{--primary: var(--color-primary);--primary-dark: var(--color-primary-hover);--bg: var(--color-bg-page);--card: var(--color-bg-surface);--text: var(--color-text);--muted: var(--color-text-secondary);--border: var(--color-border);--pass: var(--color-success);--pass-bg: var(--color-success-bg);--fail: var(--color-danger);--fail-bg: var(--color-danger-bg);--radius: var(--radius-md);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif}*{box-sizing:border-box}body{margin:0;background:linear-gradient(180deg,rgb(51 128 247 / 5%) 0%,transparent 140px),var(--bg);color:var(--text);font-size:var(--text-body);line-height:1.6}code{font-size:.9em;background:#eef2ff;padding:.1em .35em;border-radius:4px}.top{background:var(--card);border-bottom:1px solid var(--border);box-shadow:var(--shadow-sm)}.top-inner{display:flex;align-items:center;gap:20px;max-width:var(--shell-max-width);margin:0 auto;padding:14px var(--shell-padding-x);flex-wrap:wrap}.brand{font-size:var(--text-h3);font-weight:700;color:var(--primary);text-decoration:none;flex-shrink:0}.brand:hover{color:var(--primary-dark)}.top-actions{display:flex;align-items:center;gap:14px;margin-left:auto;flex-shrink:0}.top-site-link{color:var(--muted);text-decoration:none;font-size:var(--text-caption);font-weight:500}.top-site-link:hover{color:var(--primary)}.shell{max-width:var(--shell-max-width);margin:0 auto;padding:28px var(--shell-padding-x) 56px}.page-title,h1{margin:0 0 12px;font-size:var(--text-h1);font-weight:700;line-height:1.3}.page-head{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:12px;flex-wrap:wrap}.page-head .page-title{margin:0;flex:1;min-width:0}.page-help-btn{flex-shrink:0;min-height:44px;font-size:var(--text-body)}.follow-head-actions{display:flex;align-items:center;gap:8px}.follow-help-btn{min-height:44px;padding:8px 12px}.help-overlay{position:fixed;top:0;right:0;bottom:0;left:0;z-index:2200;display:flex;align-items:center;justify-content:center;padding:16px;background:#000000b8}.help-sheet{width:min(640px,100%);max-height:90vh;display:flex;flex-direction:column;background:var(--card);border-radius:var(--radius-md);overflow:hidden;box-shadow:var(--shadow-md)}.help-head{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:12px 16px;border-bottom:1px solid var(--border)}.help-title{margin:0;font-size:var(--text-body-lg);font-weight:700}.help-body{padding:16px;overflow:auto;flex:1}.help-section{margin-bottom:20px}.help-section:last-child{margin-bottom:0}.help-section-title{margin:0 0 8px;font-size:var(--text-h3);font-weight:600;color:var(--text)}.help-section-body{margin:0;font-size:var(--text-body);line-height:1.65;color:var(--color-text-secondary)}.help-foot{padding:12px 16px;border-top:1px solid var(--border);display:flex;justify-content:flex-end}.help-foot .btn{min-width:96px;min-height:44px}.lead{margin:0 0 20px;color:var(--color-text-secondary);font-size:var(--text-body);line-height:1.65;max-width:42em}.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:20px;margin-bottom:16px;box-shadow:0 1px 3px #0f172a0f}.card h2{margin:0 0 14px;font-size:var(--text-h2);font-weight:600}.field{display:block;margin-bottom:14px}.field span{display:block;font-size:var(--text-label);font-weight:600;margin-bottom:6px;color:var(--muted)}.field input,.field select{width:100%;padding:10px 12px;font-size:1rem;border:1px solid var(--border);border-radius:8px}.target-display{font-size:var(--text-body-xl);font-weight:600;line-height:1.5;padding:16px;background:var(--color-bg-muted);border-radius:var(--radius-sm);min-height:3rem}.target-display mark.miss{background:#fecaca;color:var(--fail);padding:0 2px;border-radius:3px}.muted{color:var(--muted);font-weight:400;font-size:1rem}.hint{font-size:var(--text-body);color:var(--muted);margin:0 0 16px;line-height:1.55}.btn-row{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:12px}.btn{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:10px 18px;font-size:var(--text-body);font-weight:600;border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--card);cursor:pointer}.btn:disabled{opacity:.5;cursor:not-allowed}.btn.primary{background:var(--primary);border-color:var(--primary);color:#fff}.btn.primary:hover:not(:disabled){background:var(--primary-dark)}.btn.assess{width:100%;margin-top:8px;min-height:48px;padding:14px;font-size:var(--text-h3);background:linear-gradient(135deg,var(--color-primary),var(--color-primary-hover));border:none;color:#fff}.rec-state{font-size:.9rem;color:var(--muted);margin:0 0 8px}.status-list{margin:0;padding-left:1.2rem;font-size:.9rem}.status-list li{margin-bottom:6px}.result-card.hidden{display:none}#result-title.pass{color:var(--pass)}#result-title.fail{color:var(--fail)}#result-summary{font-size:1rem;margin:0 0 8px}.meta{font-size:.85rem;color:var(--muted);margin:0 0 12px}.detail{display:grid;grid-template-columns:auto 1fr;gap:6px 12px;margin:0;font-size:.85rem}.detail dt{color:var(--muted);font-weight:600}.detail dd{margin:0;word-break:break-word}.notes ul{margin:0;padding-left:1.2rem;font-size:.9rem;color:var(--muted)}.notes li{margin-bottom:8px}.top-nav{display:flex;gap:4px 20px;flex:1;justify-content:center;flex-wrap:wrap}.top-nav a{color:var(--muted);text-decoration:none;font-weight:600;font-size:var(--text-body);padding:8px 4px;border-bottom:2px solid transparent;min-height:44px;display:inline-flex;align-items:center}.top-nav a.active{color:var(--primary);border-bottom-color:var(--primary)}.top-nav a:hover{color:var(--primary)}.top-actions a{color:var(--muted);text-decoration:none;font-weight:600;font-size:var(--text-caption);min-height:44px;display:inline-flex;align-items:center}.top-actions a:hover{color:var(--primary)}.top-actions .nav-logout{border:none;background:none;color:var(--muted);font-weight:600;font-size:var(--text-caption);cursor:pointer;padding:0;min-height:44px}.top-actions .nav-logout:hover{color:var(--primary)}.book-list,.lesson-list{list-style:none;margin:0;padding:0}.book-item,.lesson-list li{margin-bottom:8px}.book-link,.lesson-link{width:100%;text-align:left;padding:16px 18px;min-height:52px;border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--card);cursor:pointer;font-size:var(--text-body);box-shadow:var(--shadow-sm);transition:border-color .15s ease,background-color .15s ease,box-shadow .15s ease}.book-link:hover,.lesson-link:hover{border-color:var(--primary);background:var(--color-primary-soft);box-shadow:var(--shadow-md)}.book-pub,.lesson-name{display:block;font-weight:600;font-size:var(--text-body-lg);color:var(--text);line-height:1.45}.book-grade,.book-isbn,.lesson-id{display:block;font-size:var(--text-caption);color:var(--muted);margin-top:4px;line-height:1.5}.unit-block{margin-bottom:28px;padding:18px 18px 14px;border:1px solid var(--border);border-radius:var(--radius-md);background:#ffffffe0;box-shadow:var(--shadow-sm)}.unit-block h2{font-size:var(--text-h2);font-weight:700;margin:0 0 14px;padding:10px 12px 10px 14px;color:var(--text);background:var(--color-primary-soft);border-left:4px solid var(--primary);border-radius:var(--radius-sm);line-height:1.35}.linkish{background:none;border:none;color:var(--primary);cursor:pointer;font:inherit;padding:0}.meta-line{color:var(--muted);font-size:var(--text-caption);line-height:1.55;margin:-8px 0 20px;padding:8px 12px;background:var(--color-bg-muted);border-radius:var(--radius-sm);display:inline-block}.summary{background:#f0f9ff;border:1px solid #bae6fd;border-radius:var(--radius-sm);padding:14px 16px;margin-bottom:16px;font-size:var(--text-body);line-height:1.65}.notice.warn{background:#fffbeb;border:1px solid #fcd34d;border-radius:var(--radius-sm);padding:14px 16px;margin-bottom:16px;font-size:var(--text-body);line-height:1.65}.notice a{color:var(--primary)}.line-row{display:flex;gap:12px;align-items:flex-start;padding:12px 0;border-bottom:1px solid var(--border)}.line-row.is-playing{background:var(--color-primary-soft);border-radius:var(--radius-sm);margin:0 -8px;padding:12px 8px}.line-row.dialogue-row .line-text{flex:1;padding:10px 14px;border-radius:var(--radius-md)}.line-row.speaker-boy .line-text{background:var(--color-boy, #73a0d9);color:#fff}.line-row.speaker-boy .line-text .zh{color:#ffffffe0}.line-row.speaker-girl .line-text{background:var(--color-girl, #d9a6bf);color:#fff}.line-row.speaker-girl .line-text .zh{color:#ffffffe0}.line-actions{display:flex;flex-shrink:0;flex-direction:column;gap:6px}.icon-btn{min-width:44px;min-height:44px;padding:8px 10px;font-size:1.1rem;line-height:1}.icon-btn.playing{background:#fff7ed;border-color:#fdba74}.section-toolbar{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px 16px;padding:10px 0 12px;border-bottom:1px solid var(--border);margin-bottom:4px}.section-toggle{display:inline-flex;align-items:center;gap:8px;font-size:var(--text-body);color:var(--muted);cursor:pointer}.section-play-all{margin-left:auto;min-height:40px;font-size:var(--text-body);color:var(--primary);background:transparent;border:1px solid var(--border)}.section-play-all.playing{color:#ea580c;border-color:#fdba74;background:#fff7ed}.lesson-tts-bar{display:flex;flex-wrap:wrap;align-items:center;gap:8px;padding:12px 14px;margin-bottom:16px;background:var(--card);border:1px solid var(--border);border-radius:var(--radius-md)}.tts-bar-label{font-size:var(--text-body);font-weight:600;margin-right:4px}.tts-bar-sep{color:var(--muted);margin:0 4px}.tts-opt{min-height:40px;padding:6px 14px;font-size:var(--text-body);background:var(--color-bg-muted);border:1px solid var(--border)}.tts-opt.active{background:var(--color-primary-soft);border-color:var(--primary);color:var(--primary);font-weight:600}.line-text .en.vocab-word{color:var(--primary);font-weight:700}.story-section .story-toolbar{margin-top:4px}.story-sentences{padding-top:4px}.story-sentence .story-bubble{flex:1;padding:12px 14px;background:var(--card);border:1px solid var(--border);border-radius:var(--radius-md)}.story-sentence.is-playing .story-bubble{background:var(--color-primary-soft);border-color:var(--primary);box-shadow:var(--shadow-sm)}.story-sentence.is-playing .line-text .en{color:var(--primary)}.story-play-all:disabled{opacity:.45;cursor:not-allowed}.story-intro{display:flex;align-items:flex-start;gap:12px;margin-bottom:16px}.story-summary{flex:1;margin:0;padding:12px 14px;background:var(--color-primary-soft);border-radius:var(--radius-md);font-size:var(--text-body);line-height:1.6}.story-video-btn{flex-shrink:0;min-width:48px;min-height:48px;font-size:1.35rem;background:var(--card);border:1px solid var(--border)}.story-follow-actions{flex-direction:column;align-items:center;gap:8px}.follow-read-col{display:flex;flex-direction:column;align-items:center;gap:2px}.follow-count{font-size:var(--text-body);font-weight:700;color:var(--primary);line-height:1;min-height:1em}.story-follow-btn{min-height:40px;padding:6px 10px;font-size:var(--text-caption);white-space:nowrap}.story-video-overlay{position:fixed;top:0;right:0;bottom:0;left:0;z-index:2000;display:flex;align-items:center;justify-content:center;padding:16px;background:#000000b8}.story-video-sheet{width:min(960px,100%);max-height:92vh;display:flex;flex-direction:column;background:var(--card);border-radius:var(--radius-md);overflow:hidden;box-shadow:var(--shadow-md)}.story-video-head{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:12px 16px;border-bottom:1px solid var(--border)}.story-video-title{margin:0;font-size:var(--text-body-lg)}.story-video-body{padding:12px 16px 16px;overflow:auto}.story-video-el{width:100%;max-height:min(60vh,520px);background:#000;border-radius:var(--radius-sm)}.story-video-caption{margin:12px 0 0;line-height:1.55}.story-video-caption.en{font-size:var(--text-body-lg);font-weight:600}.story-video-caption.zh{font-size:var(--text-body);color:var(--muted)}.line-row:last-child{border-bottom:none}.line-text{flex:1;min-width:0}.line-text .en{margin:0;font-weight:600;font-size:var(--text-body-lg);line-height:1.5}.line-text .zh{margin:4px 0 0;font-size:var(--text-body);color:var(--muted);line-height:1.55}.follow-btn{flex-shrink:0;white-space:nowrap;min-height:44px;font-size:var(--text-body)}.line-actions .follow-btn{min-height:44px}.type-tag{font-size:var(--text-caption);font-weight:500;color:var(--muted)}.loading,.error-box{padding:32px 16px;text-align:center;color:var(--muted)}.state-panel{max-width:var(--shell-max-width);margin:0 auto;padding:48px var(--shell-padding-x)}.loading{display:flex;flex-direction:column;align-items:center;gap:16px}.loading p{margin:0;font-size:var(--text-body)}.loading-spinner{width:36px;height:36px;border:3px solid var(--color-border);border-top-color:var(--primary);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}@media(prefers-reduced-motion:reduce){.loading-spinner{animation:none;border-top-color:var(--color-border)}}.error-box{max-width:420px;margin:0 auto;padding:28px 24px;background:var(--card);border:1px solid var(--color-border);border-radius:var(--radius-md);box-shadow:var(--shadow-md)}.error-box__title{margin:0 0 8px;font-size:var(--text-h3);font-weight:700;color:var(--text)}.error-box__msg{margin:0 0 20px;font-size:var(--text-body);color:var(--muted);line-height:1.55}body.modal-open{overflow:hidden}.follow-overlay{position:fixed;top:0;right:0;bottom:0;left:0;z-index:1000;background:#0f172a73;display:flex;align-items:flex-end;justify-content:center;padding:0}.follow-sheet{width:100%;max-width:640px;max-height:92vh;overflow:auto;background:var(--card);border-radius:var(--radius-lg) var(--radius-lg) 0 0;padding:20px 24px 32px;box-shadow:0 -4px 24px #0f172a26}@media(min-width:768px)and (max-width:1023px){.follow-overlay{align-items:center;justify-content:center;padding:24px}.follow-sheet{max-width:560px;max-height:90vh;border-radius:var(--radius-lg);box-shadow:var(--shadow-md)}}@media(min-width:1024px){.follow-overlay{align-items:stretch;justify-content:flex-end}.follow-sheet{width:min(var(--follow-panel-width),38vw);max-width:none;max-height:none;height:100%;border-radius:var(--radius-lg) 0 0 var(--radius-lg);padding:24px 28px 32px;box-shadow:-8px 0 32px #0f172a1f}.follow-body{display:flex;flex-direction:column;min-height:calc(100% - 48px)}.follow-sheet .btn.assess{margin-top:auto}}.follow-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px}.follow-head h2{margin:0;font-size:var(--text-h2);font-weight:700}.icon-btn{min-width:44px;min-height:44px;padding:8px 12px;font-size:1.125rem;line-height:1}.translation{color:var(--muted);margin:0 0 12px}.follow-result.hidden{display:none}.pass-msg{color:var(--pass);font-weight:700;font-size:var(--text-h2);margin:0 0 8px}.fail-msg{color:var(--fail);font-weight:700;font-size:var(--text-h2);margin:0 0 8px}.follow-result-box{margin-top:16px;padding:16px;border-radius:var(--radius-sm)}.follow-result-box--pass{background:var(--pass-bg);border:1px solid #86efac}.follow-result-box--fail{background:var(--fail-bg);border:1px solid #fecaca}.follow-result-box .meta{margin:0;font-size:var(--text-caption)}.hint.subtle{margin-top:-8px;font-size:.85rem;color:var(--primary)}.follow-adaptive-hint{margin:0 0 14px;padding:10px 14px;border-radius:var(--radius-sm);background:var(--color-warning-bg);border:1px solid var(--color-warning-border);color:var(--color-warning-text);font-size:var(--text-body);font-weight:600;line-height:1.55}.follow-adaptive-hint[hidden]{display:none}.follow-sheet .btn.btn-hint-target{border-color:#d97706;color:#92400e;box-shadow:0 0 0 2px #fbbf2459}.hint.subtle[hidden]{display:none}.hint.subtle.sync-ok{color:var(--pass);font-weight:500}.karaoke-target.karaoke-mode{line-height:1.6}.karaoke-unit{display:inline-block;margin-right:.2em;padding:0 2px;border-radius:4px;transition:background .1s,color .1s}.karaoke-unit.active{background:#fef08a;color:var(--text)}.review-list{list-style:none;margin:0;padding:0}.review-item{margin-bottom:10px}.review-link{width:100%;text-align:left;padding:18px 20px;border:1px solid var(--border);border-radius:var(--radius-sm);background:#fff;cursor:pointer}.review-link:hover{border-color:var(--primary);background:#f8fbff}.review-text{display:block;font-weight:600;font-size:var(--text-body-lg);margin-bottom:6px;line-height:1.45}.review-meta{display:flex;flex-wrap:wrap;gap:8px;align-items:center;font-size:var(--text-caption);color:var(--muted);line-height:1.5}.tag{font-size:.75rem;font-weight:700;padding:2px 8px;border-radius:999px}.tag.pass{background:var(--pass-bg);color:var(--pass)}.tag.fail{background:var(--fail-bg);color:var(--fail)}.featured-story h2{margin-top:0}.story-section-title{margin:0 0 12px;font-size:var(--text-body-lg);color:var(--muted);font-weight:600}.story-card-section{margin-bottom:16px}.story-card{display:block;width:100%;padding:14px;border:1px solid var(--border);border-radius:var(--radius-md);background:var(--card);text-align:left}button.story-card{cursor:pointer;font:inherit;color:inherit}button.story-card-listened:hover{border-color:var(--primary)}.story-card-cover{display:block;width:100%;max-height:200px;object-fit:cover;border-radius:var(--radius-sm);margin-bottom:12px;background:var(--color-bg-muted)}.story-card-cover-contain{width:100%;max-height:none;height:180px;object-fit:contain}.story-cover-img-failed{object-fit:none}.story-card-cover-placeholder{min-height:180px}.story-card-summary-clamp{display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:2;overflow:hidden}button.story-card-catalog:hover{border-color:var(--primary);background:var(--color-primary-soft)}.story-catalog-list{display:grid;grid-template-columns:1fr;gap:14px}.story-book-meta{margin:0 0 16px}@media(min-width:1024px){.story-catalog-list{grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}}.story-card-body{display:flex;flex-direction:column;gap:8px}.story-card-title{margin:0;font-size:var(--text-h3);font-weight:700}.story-card-summary{margin:0;line-height:1.55;color:var(--text)}.story-card-source{margin:0;font-size:var(--text-caption)}.story-card-play{margin-top:4px;width:100%;min-height:48px;font-size:var(--text-body-lg)}.story-listened-list{display:flex;flex-direction:column;gap:12px}.story-listened-item-collapsed{display:none}.story-listened-expand{display:block;width:100%;margin-top:12px;text-align:center;font-size:var(--text-body)}.story-home{display:flex;flex-direction:column;gap:16px}.story-tab-bar{display:grid;grid-template-columns:1fr 1fr;gap:8px;padding:4px;background:var(--color-bg-muted);border-radius:var(--radius-md)}.story-tab{min-height:44px;padding:10px 16px;border:none;border-radius:calc(var(--radius-md) - 4px);background:transparent;font:inherit;font-size:var(--text-body);font-weight:600;color:var(--muted);cursor:pointer}.story-tab.is-active{background:var(--card);color:var(--primary);box-shadow:var(--shadow-sm)}.story-tab-panel[hidden]{display:none}.story-tab-panel{display:flex;flex-direction:column;gap:16px}.story-books-panel{margin:0}.story-featured-btn{display:flex;gap:14px;align-items:flex-start;width:100%;padding:12px;border:1px solid var(--border);border-radius:8px;background:#f8fbff;cursor:pointer;text-align:left}.story-featured-btn:hover{border-color:var(--primary)}.story-thumb,.story-list-thumb{width:56px;height:56px;object-fit:cover;border-radius:8px;flex-shrink:0}.story-list-thumb{width:40px;height:40px;margin-left:auto}.block{display:block;margin-top:4px}.lesson-link{display:flex;align-items:center;gap:10px;width:100%}.preview-actions{margin:20px 0}.preview-action-btn{display:flex;gap:14px;align-items:flex-start;width:100%;max-width:32rem;padding:20px 22px;text-align:left}.preview-action-btn strong{font-size:var(--text-h3);font-weight:700}.preview-action-btn .muted{color:#ffffffe5;font-size:var(--text-body);line-height:1.45}.preview-action-icon{font-size:2rem;line-height:1}.textbook-card-list{list-style:none;margin:0;padding:0;display:grid;gap:14px}@media(min-width:1024px){.textbook-card-list{grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.lesson-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.lesson-list li{margin-bottom:0}}.textbook-card-item{margin-bottom:12px}.textbook-card-row{display:flex;gap:14px;align-items:flex-start}.textbook-cover-btn{flex-shrink:0;width:56px;height:75px;padding:0;border:1px solid var(--border);border-radius:6px;background:var(--color-bg-muted);cursor:pointer;overflow:hidden;display:flex;align-items:center;justify-content:center}.textbook-cover-btn:hover{border-color:var(--primary)}.textbook-cover-img{width:100%;height:100%;object-fit:cover;display:block}.textbook-cover-placeholder{font-size:1.35rem;opacity:.55}.textbook-card-btn{flex:1;min-width:0;display:block;width:100%;padding:18px 20px;border:1px solid var(--border);border-radius:var(--radius);background:var(--card);cursor:pointer;text-align:left}.textbook-card-btn:hover{border-color:var(--primary);background:var(--color-primary-soft)}.textbook-card-icon{font-size:1.5rem;flex-shrink:0}.textbook-card-body{display:flex;flex-direction:column;gap:6px;min-width:0;flex:1}.textbook-card-grade{font-size:var(--text-h3);font-weight:700;line-height:1.35}.textbook-card-pub{font-size:var(--text-caption);color:var(--muted);line-height:1.5}.book-meta-line{display:block;font-size:var(--text-caption);color:var(--muted);line-height:1.55;word-break:break-word}.textbook-cover-overlay{position:fixed;top:0;right:0;bottom:0;left:0;z-index:2000;display:flex;align-items:center;justify-content:center;padding:16px;background:#000000b8}.textbook-cover-sheet{width:min(720px,100%);max-height:92vh;display:flex;flex-direction:column;background:var(--card);border-radius:var(--radius-md);overflow:hidden;box-shadow:var(--shadow-md)}.textbook-cover-head{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:12px 16px;border-bottom:1px solid var(--border)}.textbook-cover-title{margin:0;font-size:var(--text-body-lg)}.textbook-cover-body{padding:16px;overflow:auto;display:flex;align-items:center;justify-content:center;background:var(--color-bg-muted)}.textbook-cover-full{max-width:100%;max-height:min(72vh,900px);object-fit:contain;border-radius:var(--radius-sm);box-shadow:var(--shadow-sm)}.review-card-link{display:flex;gap:14px;align-items:flex-start}.review-thumb{font-size:1.75rem;flex-shrink:0;line-height:1.2}.review-card-body{flex:1;min-width:0}.vocab-word{color:var(--primary);font-weight:700}.grammar-item{margin-bottom:14px;padding-bottom:14px;border-bottom:1px solid var(--border)}.grammar-item:last-child{margin-bottom:0;padding-bottom:0;border-bottom:none}.grammar-rule{margin:0 0 8px;font-weight:600}.subtext{margin:4px 0 0;font-size:.85rem;color:var(--muted)}.exercise-row{margin-bottom:12px}.exercise-pairs{margin:6px 0 0;padding-left:1.2rem;font-size:.9rem;color:var(--muted)}.empty-state{padding:40px 24px;text-align:center;background:var(--card);border:1px solid var(--border);border-radius:var(--radius-md);box-shadow:var(--shadow-sm)}.empty-state__icon{font-size:2.5rem;line-height:1;margin-bottom:12px}.empty-state .muted{font-size:var(--text-body);line-height:1.6;max-width:28rem;margin:0 auto 8px}.empty-state .btn{margin-top:16px}@media(min-width:1024px){.review-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.review-item{margin-bottom:0}}@media(max-width:767px){.top-inner{gap:12px}.top-nav{order:3;width:100%;justify-content:flex-start}.top-actions{margin-left:0}}.event-tools{margin-top:24px}.event-tools__actions{margin-top:12px}.error-text{color:var(--color-danger, #b91c1c)}.event-tools-dialog .follow-body{padding-top:0}