@font-face{font-family:Manrope;src:url('./fonts/manrope.ttf') format('truetype');font-weight:200 800;font-display:swap}
:root{color-scheme:light;--paper:#f4f6fa;--surface:#fff;--ink:#172239;--muted:#5e6b81;--line:#dce2ec;--accent:#2457d6;--accent-hover:#1945b5;--tint:#eaf0ff;--amber:#89530a;--red:#b33540;--radius:14px;--font:Manrope,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;font-family:var(--font);font-size:calc(14px * var(--font-scale,1));line-height:1.65;color:var(--ink);background:var(--paper);font-synthesis:none}
*{box-sizing:border-box;scrollbar-width:thin;scrollbar-color:#a9b5cb transparent}body{margin:0}button,input,select,textarea{font:inherit}button,a,input,textarea,select{-webkit-tap-highlight-color:transparent}h1,h2,h3,p{margin:0}h1{font-size:2rem;line-height:1.35;letter-spacing:-.03em;font-weight:800;text-wrap:balance}h2{font-size:1.4285714rem;line-height:1.5;font-weight:750;letter-spacing:-.02em}h3{font-size:1.1428571rem;font-weight:750}small,.small{font-size:0.85714286rem}.muted{color:var(--muted)}a{color:var(--accent);text-underline-offset:4px}::selection{background:#cddcfe;color:#112959}:focus-visible{outline:3px solid #648bf0;outline-offset:3px}
button{cursor:pointer;border:1px solid var(--line);background:var(--surface);color:var(--ink);border-radius:9px;padding:10px 14px;min-height:42px;display:inline-flex;align-items:center;justify-content:center;gap:7px;font-weight:650;transition:background .18s ease-out,border-color .18s ease-out,color .18s ease-out}button:hover{background:#f0f4fc;border-color:#a5b8dc}button:active{background:#e3ebfa}button:disabled{opacity:.48;cursor:default}button.primary{background:var(--accent);color:white;border-color:transparent}button.primary:hover{background:var(--accent-hover)}button.text{border-color:transparent;background:transparent;color:var(--muted);padding:7px 9px}button.text:hover{background:var(--tint);color:var(--accent)}button.danger{color:var(--red)}button.icon{padding:8px;min-width:40px}svg{width:18px;height:18px;flex-shrink:0;vertical-align:middle;stroke:currentColor;fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
input,select,textarea{width:100%;border:1px solid #bfcada;border-radius:9px;padding:11px 13px;background:var(--surface);color:var(--ink);caret-color:var(--accent);transition:border-color .18s ease-out}input:hover,select:hover,textarea:hover{border-color:#8da4c6}input:focus,select:focus,textarea:focus{border-color:var(--accent)}input[type=checkbox]{width:18px;height:18px;accent-color:var(--accent);flex-shrink:0}input::placeholder,textarea::placeholder{color:#69758a}textarea{resize:vertical;line-height:1.8}label{display:block;font-size:0.92857143rem;font-weight:650;margin:18px 0 7px}code{font:0.92857143rem ui-monospace,monospace;background:var(--tint);border-radius:4px;padding:2px 5px}
/* Application chrome */
.topbar{height:80px;margin:auto;padding:0 36px;display:flex;align-items:center;justify-content:space-between;background:var(--surface);border-bottom:1px solid var(--line)}.brand{display:flex;gap:11px;align-items:center;font-size:1.4285714rem;font-weight:800;letter-spacing:-.035em}.brand img{width:38px;height:38px}.brand small{display:block;font-weight:500;letter-spacing:.02em;font-size:0.78571429rem;color:var(--muted);margin-top:0}.top-actions{display:flex;align-items:center;gap:14px}.avatar{height:34px;width:34px;display:grid;place-items:center;background:var(--tint);color:var(--accent);border-radius:50%;font-weight:800}.shell{display:grid;grid-template-columns:220px minmax(0,1fr);min-height:calc(100dvh - 80px)}.rail{padding:28px 16px;border-right:1px solid var(--line);background:var(--surface);display:flex;flex-direction:column;gap:8px}.nav{width:100%;justify-content:flex-start;border:0;background:transparent;color:var(--muted);gap:12px;padding:12px 16px;min-height:46px}.nav.active{background:var(--tint);color:var(--accent);font-weight:800}.rail-bottom{margin-top:auto;padding-top:40px}.rail-note{font-size:0.85714286rem;line-height:1.9;color:var(--muted);padding:18px 16px 0}.content{max-width:930px;width:100%;margin-inline:auto;padding:36px 48px 72px;min-width:0}.page-heading{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:28px}.page-heading p{margin-top:8px;color:var(--muted);font-size:0.92857143rem}.actions{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
/* Reading and learning */
.video-summary{padding:0 0 24px;margin-bottom:24px;border-bottom:1px solid var(--line)}.video-summary h2{font-size:1.4285714rem;line-height:1.5;margin:10px 0 14px;overflow-wrap:anywhere}.video-meta{display:flex;align-items:center;gap:8px;color:var(--muted);font-size:0.85714286rem;font-weight:600}.status-dot{width:7px;height:7px;display:inline-block;border-radius:50%;background:var(--accent)}.video-controls{display:flex;justify-content:space-between;gap:12px;align-items:center;flex-wrap:wrap}.checkline{display:flex;gap:9px;align-items:center;margin:0;font-size:0.92857143rem;font-weight:500}.section-label{display:flex;justify-content:space-between;align-items:center;margin:30px 0 6px}.section-label h2{font-size:1.1428571rem;font-weight:800}.scope-summary{font-size:0.85714286rem;color:var(--muted);margin-bottom:18px}.word-card{padding:24px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);margin:0 0 16px;scroll-margin-top:24px}.word-card.current{border-color:var(--accent);background:#f7f9ff}.word-top{display:flex;justify-content:space-between;align-items:flex-start;gap:14px}.word-top>div{min-width:0}.word{font:800 2.1428571rem/1.25 var(--font);letter-spacing:-.035em;color:var(--ink);overflow-wrap:anywhere;text-align:left}.word-link{border:0;background:none;padding:0;min-height:0;justify-content:flex-start}.word-link:hover{color:var(--accent);background:none}.kind{font-size:0.78571429rem;background:#edf1f7;color:#536178;padding:3px 8px;border-radius:5px;white-space:nowrap;display:inline-block;font-weight:650}.ipa-row{display:flex;align-items:center;flex-wrap:wrap;gap:8px;margin:10px 0 0;color:var(--muted);font-size:0.92857143rem}.ipa-row button{min-height:32px;min-width:32px;padding:6px;color:var(--accent);border:0;background:var(--tint);border-radius:50%}.meaning{font-size:1rem;margin:12px 0 20px;font-weight:650}.context{padding:17px 0 0;border-top:1px solid #e8edf5}.sentence{font-size:1.2142857rem;line-height:1.75;color:var(--ink);margin:0 0 8px;overflow-wrap:anywhere;max-width:70ch;font-weight:550}.translation{font-size:0.92857143rem;color:var(--muted);line-height:1.85;max-width:72ch}.timestamp{font-variant-numeric:tabular-nums;color:var(--accent);font-size:0.85714286rem;font-weight:750;min-height:30px;padding:4px 9px;background:var(--tint);border:0;white-space:nowrap;flex-shrink:0;border-radius:6px}.word-footer{display:flex;align-items:center;justify-content:space-between;gap:7px;flex-wrap:wrap;margin-top:20px}.word-footer button{font-size:0.85714286rem;min-height:38px}.word-footer .actions{gap:4px}.word-footer button[data-action=save]:not(.saved){background:var(--tint);border-color:transparent;color:var(--accent)}.reason{font-size:0.85714286rem;color:var(--muted);margin-top:14px}.memo{font-size:0.92857143rem;margin-top:12px}.saved{color:var(--accent)!important}.note-source{font-size:0.85714286rem;color:var(--muted);margin:18px 0 0}.resume-bar{display:flex;justify-content:space-between;align-items:center;background:#dfe9ff;color:#1b449e;padding:14px 16px;border-radius:10px;gap:12px;margin:18px 0}.resume-bar strong{font-size:0.92857143rem}.resume-bar .primary{min-height:38px}.divider{margin-top:32px;border-top:1px solid var(--line);padding-top:24px}
/* Feedback, empty states and progress */
.notice{padding:14px 17px;border-radius:10px;background:#eaf0fc;color:#354e7c;font-size:0.92857143rem;margin:18px 0;line-height:1.8}.notice.warning{background:#fff2d9;color:#80500c}.notice.error{background:#fbecef;color:#a12d3c}.notice a{color:inherit;font-weight:650}.empty{padding:52px 20px;text-align:center}.empty>svg{height:40px;width:40px;color:var(--accent);margin-bottom:18px}.empty h2{font-size:1.5rem;margin-bottom:10px}.empty p{color:var(--muted);max-width:390px;margin:0 auto 24px}.empty .actions{justify-content:center}.progress{height:5px;width:100%;accent-color:var(--accent);border:0;border-radius:4px;overflow:hidden}.progress-label{font-size:0.85714286rem;color:var(--muted);display:flex;justify-content:space-between;align-items:center;margin:10px 0}.loading{padding:30px 20px;text-align:center;color:var(--muted)}.loading::before{content:'';display:inline-block;width:7px;height:7px;border-radius:50%;background:var(--accent);margin-right:10px;animation:pulse 1.5s ease-out infinite}@keyframes pulse{50%{opacity:.3}}.inline-error{color:var(--red);font-size:0.92857143rem;margin-top:12px;white-space:pre-wrap}.footer-hint,.field-hint{font-size:0.85714286rem;color:var(--muted);margin-top:7px;line-height:1.8}#toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);background:#17253e;color:#fff;border-radius:10px;padding:13px 18px;width:max-content;max-width:calc(100vw - 32px);z-index:2147483647;font-size:0.92857143rem;box-shadow:0 8px 28px #14213c26;display:none}#toast.visible{display:block}#toast.error{background:#a12d3c}
/* Forms and collections */
.import-box{margin:24px 0;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:22px}.import-box summary{cursor:pointer;font-weight:700;list-style-position:outside;margin-left:14px;font-size:0.92857143rem}.import-box summary::marker{color:var(--accent)}.import-box[open]>summary{margin-bottom:14px}.import-box label{font-size:0.92857143rem}.file{padding:9px;font-size:0.85714286rem}.file::file-selector-button{border:0;border-radius:5px;background:var(--tint);color:var(--accent);padding:7px 10px;margin-right:10px;font:inherit;cursor:pointer}.form-section{padding:26px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);margin:0 0 18px}.form-section h2{font-size:1.2857143rem;margin-bottom:8px}.form-section>.checkline{margin-top:12px}.scope-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin:18px 0 8px}.scope-option{padding:12px;display:flex;align-items:center;gap:9px;font-size:0.92857143rem;border:1px solid var(--line);border-radius:9px;margin:0;background:transparent;font-weight:600;cursor:pointer}.scope-option:has(input:checked){border-color:#7295e9;background:var(--tint);color:#214fae}.form-row{display:grid;grid-template-columns:1fr 1fr;gap:16px}.form-bottom{margin-top:24px;display:flex;gap:10px;align-items:center;flex-wrap:wrap}.list-toolbar{display:flex;gap:10px;margin-bottom:20px}.list-toolbar input{flex:1;min-width:0}.list-toolbar button{flex-shrink:0;white-space:nowrap}.known-row{padding:18px 20px;display:flex;justify-content:space-between;align-items:center;gap:14px;border:1px solid var(--line);border-radius:10px;background:var(--surface);margin:10px 0}.known-row strong{font-size:1.3571429rem;font-weight:750;letter-spacing:-.02em;overflow-wrap:anywhere}.tabs-inline{display:flex;gap:5px}.tabs-inline button{flex:1}.backend-help{padding:18px;background:#f0f4fc;border-radius:9px;margin-top:16px}
/* Account entry */
.auth-layout{min-height:calc(100dvh - 80px);max-width:1200px;margin:auto;display:grid;grid-template-columns:1.1fr 1fr;align-items:center;padding:64px 48px;gap:80px}.auth-story h1{font-size:3.4285714rem;line-height:1.22;letter-spacing:-.035em;font-weight:800;margin-bottom:24px}.auth-story>p{color:var(--muted);font-size:1.0714286rem;line-height:1.9;max-width:390px}.auth-example{margin-top:36px;padding:26px;background:#17253e;color:#f4f7ff;border-radius:16px}.auth-example .word{color:#fff;font-size:2.1428571rem}.auth-example .muted{color:#b9c9e7}.auth-example p{margin-top:10px}.auth-form{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:36px}.auth-form h2{font-size:1.7857143rem;margin-bottom:8px}.auth-form .primary{width:100%;margin-top:24px;min-height:46px}.auth-form .switch{display:flex;justify-content:center;margin-top:16px}.auth-form .field-hint{margin-top:18px}
/* Usage is a compact ledger, with its summary kept subordinate to the records. */
.usage-summary{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:0;margin:24px 0 16px;border-block:1px solid var(--line);padding:20px 0}.usage-summary>div{padding:0 20px;border-right:1px solid var(--line)}.usage-summary>div:first-child{padding-left:0}.usage-summary>div:last-child{border-right:0}.usage-summary strong{display:block;font-size:1.7857143rem;font-weight:800;line-height:1.4;overflow-wrap:anywhere;font-variant-numeric:tabular-nums}.usage-summary span{font-size:0.85714286rem;color:var(--muted)}.usage-record{border-bottom:1px solid var(--line);padding:22px 0;overflow-wrap:anywhere}.usage-top,.usage-tokens{display:flex;justify-content:space-between;gap:12px}.usage-top strong{font-weight:750}.usage-record>p{margin-top:8px}.usage-tokens{margin:16px 0;font-size:0.92857143rem;font-variant-numeric:tabular-nums}.usage-tokens b{font-weight:750}.usage-record details{font-size:0.85714286rem;color:var(--muted)}.usage-record summary{cursor:pointer}.usage-record .kind{flex-shrink:0}
@media(max-width:950px){.topbar{padding:0 24px}.shell{grid-template-columns:180px minmax(0,1fr)}.rail{padding:24px 12px}.content{padding:32px 28px}.auth-layout{padding:40px 28px;gap:36px}.auth-story h1{font-size:2.8571429rem}.auth-form{padding:28px}}
@media(max-width:560px){.topbar{height:72px;padding:0 18px}.brand{font-size:1.2857143rem;gap:10px}.brand img{width:34px;height:34px}.top-actions .email{display:none}.top-actions{gap:5px}.avatar{height:30px;width:30px;font-size:0.85714286rem}.shell{display:block;min-height:calc(100dvh - 72px)}.rail{padding:8px 10px;display:grid;grid-template-columns:repeat(4,minmax(0,1fr)) 34px;gap:3px;border-right:0;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:2;background:var(--surface)}.nav{padding:6px 2px;justify-content:center;flex-direction:column;gap:4px;font-size:0.78571429rem;min-height:52px;white-space:nowrap;border-radius:8px}.nav svg{width:18px;height:18px}.rail-bottom{margin:0;padding:0}.rail-bottom .nav .nav-label{display:none}.rail-note{display:none}.content{padding:28px 18px 50px}.page-heading{margin-bottom:24px;gap:10px}.page-heading h1{font-size:1.7857143rem}.page-heading p{font-size:0.85714286rem;line-height:1.8}.page-heading .actions{gap:2px}.video-summary h2{font-size:1.2857143rem}.word{font-size:1.9285714rem}.word-card,.word-card.current{padding:20px 18px;margin-bottom:14px}.word-top{gap:10px}.sentence{font-size:1.1428571rem}.ipa-row{gap:7px;font-size:0.85714286rem}.word-footer{gap:4px;margin-top:18px}.word-footer button{padding:8px 9px}.word-footer>.text{padding-inline:4px}.auth-layout{display:block;padding:32px 20px}.auth-story{display:none}.auth-form{border:0;background:transparent;padding:8px 0}.auth-form h2{font-size:1.9285714rem}.form-section{padding:20px 18px}.form-section h2{font-size:1.2857143rem}.import-box{padding:18px}.form-row{gap:10px}.scope-option{padding:11px 9px;gap:7px}.list-toolbar{flex-wrap:wrap}.list-toolbar input{flex:1;min-width:120px}.known-row{padding:14px 16px}.usage-summary>div{padding:0 10px}.usage-summary strong{font-size:1.5714286rem}.usage-tokens{gap:7px;font-size:0.85714286rem}.notice{padding:13px 15px}.empty{padding:40px 10px}}
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important;scroll-behavior:auto!important}}

/* Speaking practice stays within the notebook card. */
.practice{margin-top:24px;padding-top:22px;border-top:1px solid var(--line)}.practice-kicker{font-size:0.85714286rem;font-weight:750;color:var(--accent);margin:0 0 8px}.practice>label{font-size:1.0714286rem;margin-top:0}.practice textarea{margin:10px 0 12px;min-height:96px;line-height:1.7}.practice-actions{display:flex;gap:8px;flex-wrap:wrap}.practice-actions button,.practice-history>button{font-size:0.85714286rem;min-height:36px}.practice-status:empty{display:none}.practice-status{margin:12px 0}.practice-feedback{margin-top:18px;padding:16px;background:var(--tint);border:1px solid #d6e3ff;border-radius:10px;font-size:0.92857143rem;line-height:1.8;overflow-wrap:anywhere}.practice-feedback dl{margin:12px 0}.practice-feedback dt{font-size:0.78571429rem;font-weight:750;color:var(--accent);margin-top:10px}.practice-feedback dd{margin:2px 0 0}.practice-example{font-size:1.0714286rem;line-height:1.75;margin:5px 0 14px}.practice-feedback .small{margin-bottom:0}.practice-history details{border-top:1px solid var(--line);padding:12px 0;font-size:0.92857143rem}.practice-history summary{cursor:pointer;overflow-wrap:anywhere}.practice .field-hint{font-size:0.78571429rem;line-height:1.7;margin:14px 0 4px}

.notebook-filter{margin:12px 0}.notebook-context{overflow-wrap:anywhere}

.bionic-reading{font-weight:400}.bionic-reading .bionic-prefix{font-weight:750}

.ipa-row button.pronunciation{border-radius:7px;padding:6px 9px;font-size:.85714286rem;min-height:34px}

.google-login{width:100%;background:#fff;color:#1f1f1f;border-color:var(--line);min-height:46px;margin:18px 0 4px}.google-login img{width:20px;height:20px}.password-login{margin-top:22px}.password-login summary{cursor:pointer;color:var(--muted);font-size:.92857143rem;padding:8px 0}.password-login form{margin-top:12px}

.assessment{max-width:720px;margin:0 auto;padding:24px}.assessment fieldset{border:0;padding:0;margin:24px 0}.assessment legend{font-weight:700;margin-bottom:12px}.assessment-choice{display:flex;align-items:flex-start;gap:12px;padding:14px;margin:10px 0;border:1px solid #ccd6e7;border-radius:12px;cursor:pointer}.assessment-choice input{width:auto;flex:none;margin-top:4px}.assessment-choice:has(input:checked){border-color:#2457d6;background:#edf2ff}.assessment-choice span{overflow-wrap:anywhere}.assessment h1{font-size:26px}