:root{--bg-primary: #ffffff;--bg-secondary: #fafafa;--bg-subtle: #f4f4f5;--border-light: #e4e4e7;--border-subtle: #f0f0f2;--text-primary: #18181b;--text-secondary: #52525b;--text-muted: #71717a;--text-subtle: #a1a1aa;--accent-primary: #10b981;--accent-light: #ecfdf5;--accent-dark: #059669;--badge-read-bg: #ecfdf5;--badge-read-text: #065f46;--badge-unread-bg: #f4f4f5;--badge-unread-text: #52525b;--font-serif: Charter, "Bitstream Charter", "Sitka Text", Cambria, Georgia, serif;--font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Inter", Helvetica, Arial, sans-serif;--font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;--nav-height: 64px;--bottom-bar-height: 60px;--container-max: 760px;--radius-sm: 6px;--radius-md: 10px;--radius-lg: 16px;--radius-full: 9999px;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .04);--shadow-md: 0 4px 12px rgba(0, 0, 0, .06);--shadow-lg: 0 12px 32px rgba(0, 0, 0, .08)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-primary);color:var(--text-primary);font-family:var(--font-sans);font-size:16px;line-height:1.6;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;padding-bottom:calc(var(--bottom-bar-height) + 24px)}a{color:inherit;text-decoration:none}button{font-family:inherit;cursor:pointer;border:none;background:none}.app-header{position:sticky;top:0;background-color:#fffffff0;backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--border-light);z-index:100}.header-container{max-width:var(--container-max);margin:0 auto;padding-block:10px;padding-inline:clamp(12px,3vw,20px);min-height:var(--nav-height);display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:8px}.brand-wrapper{display:flex;align-items:center;flex-shrink:0}.brand-logo{font-size:clamp(1rem,.5rem + 3vw,1.25rem);font-weight:700;letter-spacing:-.5px;line-height:1.2;white-space:nowrap;color:var(--text-primary)}.header-right{display:flex;align-items:center;gap:8px;margin-inline-start:auto}.reading-progress-pill{display:flex;align-items:center;gap:8px;background:var(--bg-subtle);padding:6px 10px;border-radius:var(--radius-full);font-size:12px;font-weight:600;line-height:1.5;white-space:nowrap;font-variant-numeric:tabular-nums;color:var(--text-secondary)}.pill-progress-track{width:48px;height:6px;flex-shrink:0;background:var(--border-light);border-radius:var(--radius-full);overflow:hidden}.pill-progress-fill{height:100%;background:var(--accent-primary);width:0%;transition:width .3s ease}.btn-reset-reads{display:grid;place-items:center;width:44px;height:44px;flex-shrink:0;color:var(--text-muted);border-radius:var(--radius-md);border:1px solid var(--border-light);transition:background-color .2s ease,color .2s ease,border-color .2s ease}.btn-reset-reads:hover{background:#fee2e2;color:#dc2626;border-color:#fca5a5}.btn-reset-reads:focus-visible{outline:2px solid var(--text-primary);outline-offset:3px}@media (max-width: 480px){.pill-progress-track{display:none}}.main-content{max-width:var(--container-max);margin:0 auto;padding:24px 20px 40px}.app-view{display:none}.app-view.active{display:block;animation:fadeIn .2s ease-out}@keyframes fadeIn{0%{opacity:0;transform:translateY(4px)}to{opacity:1;transform:translateY(0)}}.search-section{margin-bottom:20px}.search-input-wrapper{position:relative;display:flex;align-items:center}.search-icon{position:absolute;left:14px;color:var(--text-subtle);pointer-events:none}.search-field{width:100%;padding:12px 16px 12px 42px;border:1px solid var(--border-light);border-radius:var(--radius-full);font-size:14px;color:var(--text-primary);background:var(--bg-secondary);transition:all .2s ease}.search-field:focus{outline:none;background:#fff;border-color:var(--text-primary);box-shadow:0 0 0 3px #0000000a}.filter-bar{display:flex;flex-direction:column;gap:10px;margin-bottom:28px}.filter-chips-row{display:flex;align-items:center;gap:8px;overflow-x:auto;padding-bottom:4px;scrollbar-width:none}.filter-chips-row::-webkit-scrollbar{display:none}.filter-chip{white-space:nowrap;font-size:13px;font-weight:500;padding:6px 14px;border-radius:var(--radius-full);background:var(--bg-secondary);color:var(--text-secondary);border:1px solid var(--border-light);transition:all .2s ease}.filter-chip:hover{background:var(--bg-subtle);color:var(--text-primary)}.filter-chip.active{background:var(--text-primary);color:#fff;border-color:var(--text-primary)}.articles-feed-container{display:flex;flex-direction:column;gap:24px}.article-card{padding:24px 0;border-bottom:1px solid var(--border-subtle);transition:opacity .2s ease}.article-card.article-is-read{opacity:.85}.card-meta-row{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--text-muted);margin-bottom:8px}.channel-badge{font-weight:600;color:var(--text-primary)}.meta-dot{font-weight:700;color:var(--text-subtle)}.card-read-status{margin-left:auto;font-size:11px;font-weight:600;padding:2px 8px;border-radius:var(--radius-full)}.status-read{background:var(--badge-read-bg);color:var(--badge-read-text)}.status-unread{background:var(--badge-unread-bg);color:var(--badge-unread-text)}.card-title{font-size:20px;font-weight:700;line-height:1.35;letter-spacing:-.3px;color:var(--text-primary);margin-bottom:6px;cursor:pointer;transition:color .15s ease}.card-title:hover{color:#3b82f6}.card-subtitle{font-size:14px;font-weight:400;color:var(--text-secondary);line-height:1.5;margin-bottom:8px}.card-excerpt{font-family:var(--font-serif);font-size:15px;color:var(--text-muted);line-height:1.6;margin-bottom:16px}.card-footer{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px}.footer-left{display:flex;align-items:center;gap:8px}.read-time-pill{font-size:12px;color:var(--text-muted)}.category-pill{font-size:11px;padding:3px 8px;background:var(--bg-subtle);border-radius:var(--radius-sm);color:var(--text-secondary)}.footer-actions{display:flex;align-items:center;gap:8px}.btn-icon-action{display:flex;align-items:center;gap:4px;font-size:12px;font-weight:500;color:var(--text-secondary);padding:5px 10px;border:1px solid var(--border-light);border-radius:var(--radius-full);background:#fff;transition:all .2s ease}.btn-icon-action:hover{border-color:var(--text-primary);color:var(--text-primary)}.btn-check-toggle{width:28px;height:28px;border-radius:50%;border:1px solid var(--border-light);display:flex;align-items:center;justify-content:center;font-size:13px;color:var(--text-muted);transition:all .2s ease}.btn-check-toggle.checked{background:var(--accent-primary);border-color:var(--accent-primary);color:#fff}.reader-layout{max-width:680px;margin:0 auto}.reader-top-bar{display:flex;align-items:center;justify-content:space-between;margin-bottom:24px;padding-bottom:16px;border-bottom:1px solid var(--border-subtle)}.btn-back-feed{display:flex;align-items:center;gap:6px;font-size:13px;font-weight:500;color:var(--text-secondary);transition:color .15s ease}.btn-back-feed:hover{color:var(--text-primary)}.btn-toggle-read-status{font-size:12px;font-weight:600;padding:6px 14px;border-radius:var(--radius-full);border:1px solid var(--border-light);background:#fff;color:var(--text-secondary);transition:all .2s ease}.btn-toggle-read-status.is-read{background:var(--badge-read-bg);border-color:#a7f3d0;color:var(--badge-read-text)}.reader-article-header{margin-bottom:28px}.reader-meta{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--text-muted);margin-bottom:12px}.reader-title{font-size:32px;font-weight:800;letter-spacing:-.6px;line-height:1.25;color:var(--text-primary);margin-bottom:12px}.reader-subtitle{font-size:18px;font-weight:400;color:var(--text-secondary);line-height:1.5;margin-bottom:20px}.reader-author-box{display:flex;align-items:center;gap:12px;padding-top:16px;border-top:1px solid var(--border-subtle)}.author-avatar{width:42px;height:42px;border-radius:50%;background:var(--text-primary);color:#fff;display:flex;align-items:center;justify-content:center;font-size:16px;font-weight:700}.author-info{display:flex;flex-direction:column}.author-name{font-size:14px;font-weight:600;color:var(--text-primary)}.author-role{font-size:12px;color:var(--text-muted)}.reader-practice-callout{background:#f8fafc;border:1px solid #e2e8f0;border-left:4px solid var(--accent-primary);border-radius:var(--radius-md);padding:16px 20px;margin-bottom:32px;display:flex;flex-direction:column;gap:12px}.callout-text{font-size:14px;color:var(--text-secondary);line-height:1.5}.callout-buttons{display:flex;gap:10px;flex-wrap:wrap}.btn-callout-practice{font-size:13px;font-weight:600;padding:8px 16px;border-radius:var(--radius-full);background:#fff;border:1px solid var(--border-light);color:var(--text-primary);transition:all .2s ease;box-shadow:var(--shadow-sm)}.btn-callout-practice:hover{background:var(--text-primary);color:#fff;border-color:var(--text-primary)}.reader-body-text{font-family:var(--font-serif);font-size:19px;line-height:1.75;color:#242424}.reader-body-text p{margin-bottom:24px}.reader-body-text .article-lead{font-size:21px;font-weight:400;line-height:1.65;color:#111827}.reader-body-text h2{font-family:var(--font-sans);font-size:24px;font-weight:700;letter-spacing:-.4px;margin-top:40px;margin-bottom:16px;color:var(--text-primary)}.reader-body-text blockquote{font-style:italic;padding-left:20px;border-left:3px solid var(--text-primary);margin:32px 0;color:#374151}.reader-body-text ul,.reader-body-text ol{margin-bottom:28px;padding-left:28px}.reader-body-text li{margin-bottom:12px}.reader-chunks-box{margin-top:48px;padding:24px;background:var(--bg-secondary);border:1px solid var(--border-light);border-radius:var(--radius-lg)}.reader-chunks-box h3{font-size:18px;font-weight:700;margin-bottom:6px;color:var(--text-primary)}.chunks-desc{font-size:13px;color:var(--text-muted);margin-bottom:16px}.chunks-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:12px}.chunk-item{padding:12px 14px;background:#fff;border:1px solid var(--border-subtle);border-radius:var(--radius-md);display:flex;flex-direction:column;gap:4px}.chunk-en{font-weight:700;font-size:14px;color:var(--text-primary)}.chunk-id{font-size:12px;color:var(--text-muted)}.reader-footer-nav{display:flex;align-items:center;justify-content:space-between;margin-top:48px;padding-top:24px;border-top:1px solid var(--border-light)}.bottom-nav-bar{position:fixed;bottom:0;left:0;right:0;height:var(--bottom-bar-height);background-color:#fffffff5;backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);border-top:1px solid var(--border-light);display:flex;align-items:center;justify-content:space-around;z-index:100}.nav-item{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;color:var(--text-muted);font-size:11px;font-weight:500;padding:6px 12px;border-radius:var(--radius-sm);transition:all .15s ease}.nav-item svg{stroke-width:2;transition:stroke .15s ease}.nav-item.active{color:var(--text-primary);font-weight:700}.nav-item.active svg{stroke:var(--accent-primary)}.modal-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;background:#00000073;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);display:flex;align-items:center;justify-content:center;padding:20px;z-index:200;opacity:0;pointer-events:none;transition:opacity .2s ease}.modal-backdrop.modal-open{opacity:1;pointer-events:auto}.modal-card{background:#fff;border-radius:var(--radius-lg);max-width:440px;width:100%;padding:28px;box-shadow:var(--shadow-lg);border:1px solid var(--border-light)}.modal-card h3{font-size:20px;font-weight:700;margin-bottom:8px}.modal-card p{font-size:14px;color:var(--text-secondary);line-height:1.5;margin-bottom:24px}.modal-actions{display:flex;gap:12px;justify-content:flex-end}.btn-primary{background:var(--text-primary);color:#fff;padding:10px 20px;border-radius:var(--radius-full);font-size:14px;font-weight:600;transition:opacity .15s ease}.btn-primary:hover{opacity:.9}.btn-secondary{background:var(--bg-subtle);color:var(--text-primary);padding:10px 18px;border-radius:var(--radius-full);font-size:14px;font-weight:500;transition:background .15s ease}.btn-secondary:hover{background:var(--border-light)}.btn-danger{background:#dc2626;color:#fff;padding:10px 20px;border-radius:var(--radius-full);font-size:14px;font-weight:600}.toast-notification{position:fixed;bottom:calc(var(--bottom-bar-height) + 20px);left:50%;transform:translate(-50%) translateY(20px);background:#18181b;color:#fff;font-size:13px;font-weight:500;padding:10px 20px;border-radius:var(--radius-full);box-shadow:var(--shadow-md);opacity:0;transition:all .25s ease;z-index:300;pointer-events:none}.toast-notification.toast-show{opacity:1;transform:translate(-50%) translateY(0)}.typing-card,.speech-card{background:#fff;border:1px solid var(--border-light);border-radius:var(--radius-lg);padding:28px;box-shadow:var(--shadow-sm);margin-bottom:24px}.typing-header,.speech-header{display:flex;justify-content:space-between;align-items:flex-start;gap:16px;margin-bottom:20px;padding-bottom:16px;border-bottom:1px solid var(--border-subtle);flex-wrap:wrap}.typing-tag,.speech-tag{font-size:11px;font-weight:700;letter-spacing:.5px;color:var(--accent-dark);background:var(--accent-light);padding:3px 10px;border-radius:var(--radius-full);display:inline-block;margin-bottom:6px}.typing-article-name,.speech-article-name{font-size:17px;font-weight:700;color:var(--text-primary);line-height:1.35}.typing-progress-info,.speech-progress-info{display:flex;flex-direction:column;align-items:flex-end;font-size:12px;color:var(--text-muted);gap:6px}.typing-progress-bar,.speech-progress-bar{width:120px;height:6px;background:var(--border-light);border-radius:var(--radius-full);overflow:hidden}.typing-progress-fill,.speech-progress-fill{height:100%;background:var(--accent-primary);transition:width .3s ease}.typing-metrics-bar{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;background:var(--bg-secondary);padding:14px;border-radius:var(--radius-md);margin-bottom:24px;text-align:center}.metric-item{display:flex;flex-direction:column;gap:2px}.metric-val{font-size:22px;font-weight:800;font-family:var(--font-mono);color:var(--text-primary)}.metric-lbl{font-size:11px;font-weight:500;color:var(--text-muted);text-transform:uppercase;letter-spacing:.5px}.typing-display-box{font-family:var(--font-mono);font-size:19px;line-height:1.8;padding:24px;background:#fdfdfd;border:1px solid var(--border-light);border-radius:var(--radius-md);margin-bottom:20px;word-break:break-word;white-space:pre-wrap;transition:all .2s ease}.typing-display-box.pulse-success{border-color:var(--accent-primary);background:#f0fdf4}.char-correct{color:#059669;background:#d1fae5;border-radius:2px}.char-incorrect{color:#dc2626;background:#fee2e2;text-decoration:underline;border-radius:2px}.char-current{background:#3b82f6;color:#fff;border-radius:2px;animation:blink 1s infinite}.char-pending{color:#a1a1aa}@keyframes blink{0%,to{opacity:1}50%{opacity:.5}}.typing-input-wrapper{margin-bottom:20px}.typing-input-field{width:100%;font-family:var(--font-mono);font-size:16px;line-height:1.6;padding:16px;border:1.5px solid var(--border-light);border-radius:var(--radius-md);color:var(--text-primary);background:#fff;resize:vertical;transition:border-color .2s ease,box-shadow .2s ease}.typing-input-field:focus{outline:none;border-color:#2563eb;box-shadow:0 0 0 3px #2563eb14}.typing-input-field.input-success{border-color:var(--accent-primary);background:#ecfdf5}.typing-actions,.speech-actions{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap}.celebration-card{text-align:center;padding:48px 24px}.celebration-badge{display:inline-block;font-size:13px;font-weight:700;color:#047857;background:#d1fae5;padding:4px 14px;border-radius:var(--radius-full);margin-bottom:12px}.celebration-card h2{font-size:26px;font-weight:800;margin-bottom:8px}.celebration-subtitle{font-size:15px;color:var(--text-secondary);max-width:480px;margin:0 auto 28px}.celebration-stats{display:flex;justify-content:center;gap:20px;margin-bottom:32px;flex-wrap:wrap}.stat-pill{padding:16px 24px;background:var(--bg-secondary);border:1px solid var(--border-light);border-radius:var(--radius-md);display:flex;flex-direction:column;align-items:center;gap:4px}.stat-number{font-size:26px;font-weight:800;font-family:var(--font-mono);color:var(--text-primary)}.stat-label{font-size:11px;color:var(--text-muted);text-transform:uppercase}.target-sentence-card{background:#f8fafc;border:1px solid #e2e8f0;border-radius:var(--radius-md);padding:20px;margin-bottom:24px}.target-card-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px;flex-wrap:wrap;gap:8px}.target-label{font-size:11px;font-weight:700;color:#64748b;letter-spacing:.5px}.btn-audio-listen{display:inline-flex;align-items:center;gap:6px;font-size:12px;font-weight:600;color:#0284c7;background:#e0f2fe;padding:6px 14px;border-radius:var(--radius-full);transition:all .2s ease}.btn-audio-listen:hover{background:#bae6fd}.btn-audio-listen.playing{background:#38bdf8;color:#fff;animation:pulse 1s infinite}.target-sentence-text{font-family:var(--font-serif);font-size:21px;line-height:1.6;color:#0f172a}.mic-control-section{display:flex;flex-direction:column;align-items:center;margin:28px 0;gap:10px}.btn-mic-record{display:inline-flex;align-items:center;gap:10px;padding:14px 28px;background:var(--text-primary);color:#fff;border-radius:var(--radius-full);font-size:15px;font-weight:600;box-shadow:var(--shadow-md);transition:all .2s ease}.btn-mic-record:hover{transform:translateY(-1px);box-shadow:var(--shadow-lg)}.btn-mic-record.recording-pulse{background:#dc2626;animation:recordPulse 1.2s infinite}@keyframes recordPulse{0%{box-shadow:0 0 #dc262680}70%{box-shadow:0 0 0 16px #dc262600}to{box-shadow:0 0 #dc262600}}.mic-status-indicator{font-size:13px;font-weight:500;color:#dc2626;height:20px}.result-feedback-card{padding:24px;border-radius:var(--radius-lg);border:1px solid var(--border-light);margin-bottom:24px;animation:fadeIn .3s ease}.result-feedback-card.score-excellent{background:#f0fdf4;border-color:#bbf7d0}.result-feedback-card.score-good{background:#f0f9ff;border-color:#bae6fd}.result-feedback-card.score-fair{background:#fffbeb;border-color:#fde68a}.result-feedback-card.score-low{background:#fef2f2;border-color:#fecaca}.result-score-header{display:flex;align-items:center;gap:20px;margin-bottom:20px;padding-bottom:16px;border-bottom:1px solid rgba(0,0,0,.06)}.score-circle{width:72px;height:72px;border-radius:50%;background:#fff;display:flex;flex-direction:column;align-items:center;justify-content:center;box-shadow:var(--shadow-sm);border:2px solid currentColor}.score-excellent .score-circle{color:#059669}.score-good .score-circle{color:#0284c7}.score-fair .score-circle{color:#d97706}.score-low .score-circle{color:#dc2626}.score-val{font-size:22px;font-weight:800;font-family:var(--font-mono);line-height:1}.score-lbl{font-size:9px;font-weight:700;letter-spacing:.5px}.score-verdict h4{font-size:17px;font-weight:700;margin-bottom:4px;color:var(--text-primary)}.score-feedback-text{font-size:13px;color:var(--text-secondary);line-height:1.4}.spoken-transcript-review{margin-bottom:16px}.review-label{display:block;font-size:11px;font-weight:700;color:var(--text-muted);text-transform:uppercase;letter-spacing:.5px;margin-bottom:6px}.spoken-text-bubble{background:#fff;padding:12px 16px;border-radius:var(--radius-md);font-family:var(--font-mono);font-size:14px;color:#1e293b;border:1px solid rgba(0,0,0,.05)}.word-diff-container{margin-top:16px}.word-diff-chips{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:10px}.diff-word{font-size:14px;font-family:var(--font-mono);padding:4px 8px;border-radius:var(--radius-sm)}.diff-word.word-matched{background:#dcfce7;color:#15803d;font-weight:600}.diff-word.word-missed{background:#fee2e2;color:#b91c1c;text-decoration:line-through}.diff-legend{display:flex;gap:16px;font-size:11px;color:var(--text-muted)}.legend-item{display:flex;align-items:center;gap:6px}.dot{width:8px;height:8px;border-radius:50%}.dot-green{background:#22c55e}.dot-red{background:#ef4444}.speech-error-box{display:flex;align-items:center;gap:10px;background:#fef2f2;color:#991b1b;padding:14px 18px;border-radius:var(--radius-md);border:1px solid #fecaca;font-size:13px;margin-bottom:20px}.glossary-view-header{margin-bottom:24px}.glossary-view-header h2{font-size:24px;font-weight:800;margin-bottom:6px}.glossary-view-header p{font-size:14px;color:var(--text-secondary)}.glossary-grid{display:grid;grid-template-columns:1fr;gap:20px}.glossary-card{background:#fff;border:1px solid var(--border-light);border-radius:var(--radius-lg);padding:24px;box-shadow:var(--shadow-sm);transition:transform .15s ease,box-shadow .15s ease}.glossary-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-md)}.glossary-card-header{display:flex;align-items:baseline;gap:10px;margin-bottom:12px;flex-wrap:wrap}.glossary-term{font-size:18px;font-weight:700;color:var(--text-primary)}.glossary-phonetic{font-family:var(--font-mono);font-size:13px;color:var(--accent-dark);background:var(--accent-light);padding:2px 6px;border-radius:var(--radius-sm)}.glossary-category{margin-left:auto;font-size:11px;padding:3px 8px;background:var(--bg-subtle);border-radius:var(--radius-sm);color:var(--text-secondary)}.glossary-meaning{font-size:15px;color:#27272a;line-height:1.6;margin-bottom:16px}.glossary-example-box{background:var(--bg-secondary);border-left:3px solid var(--text-primary);padding:12px 16px;border-radius:0 var(--radius-md) var(--radius-md) 0;margin-bottom:14px}.example-label{font-size:10px;font-weight:700;text-transform:uppercase;color:var(--text-muted);letter-spacing:.5px;display:block;margin-bottom:4px}.example-en{font-family:var(--font-serif);font-size:14.5px;color:var(--text-primary);font-style:italic;margin-bottom:4px}.example-id{font-size:12.5px;color:var(--text-muted)}.glossary-tips-box{background:#f0fdf4;border:1px solid #bbf7d0;padding:10px 14px;border-radius:var(--radius-md);font-size:12.5px;color:#166534}.tips-label{font-weight:700;margin-right:4px}