:root{color-scheme:light;--ink:#242424;--muted:#686868;--paper:#f7f7f7;--line:#e3e3e3;--der:#2389e8;--die:#ed4f9b;--das:#f39824;--radius:16px;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--ink);background:var(--paper);font-synthesis:none}
*{box-sizing:border-box}body{margin:0}a{color:inherit}button,input,select{font:inherit}button,a,input,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:default;opacity:.45}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #555;outline-offset:4px}button{touch-action:manipulation}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.skip-link{position:absolute;top:-70px;left:16px;padding:14px;background:#fff;z-index:30}.skip-link:focus{top:12px}
.studio-header{max-width:1264px;margin:auto;min-height:90px;padding:20px 40px;display:flex;align-items:center;justify-content:space-between;gap:24px;border-bottom:1px solid var(--line)}.studio-brand{display:flex;align-items:center;gap:12px;text-decoration:none;font-size:18px;font-weight:760;letter-spacing:-.4px;line-height:1.3}.brand-caption{display:block;font-size:11px;font-weight:450;letter-spacing:.15px;color:var(--muted);margin-top:4px}.studio-brand-mark{width:36px;height:36px;object-fit:contain;flex-shrink:0}.studio-header nav{display:flex;gap:8px;align-items:center}.studio-header nav a{font-size:13px;text-decoration:none;padding:12px 14px;border-radius:8px;font-weight:600}.studio-header nav a:hover{background:#ededed}.studio-header nav a[aria-current]{background:#fff;box-shadow:0 1px 4px #00000009;border:1px solid var(--line)}
.studio-main{max-width:1264px;margin:auto;padding:0 40px 42px}.studio-intro{display:flex;justify-content:space-between;align-items:center;gap:50px;padding:60px 0 44px}.eyebrow,.step-label{font-size:10px;letter-spacing:1.65px;font-weight:750;margin:0 0 15px;color:#747474}h1{font-size:clamp(32px,4vw,48px);line-height:1.09;letter-spacing:-1.9px;margin:0;font-weight:730}h1 span{color:#777}.intro-copy{font-size:15px;line-height:1.7;color:#656565;max-width:535px;margin:20px 0 0}.intro-note{flex:0 0 226px;padding:24px 0 20px 25px;border-left:1px solid var(--line)}.intro-note .tricolor-rule{width:68px;margin-bottom:19px}.intro-note strong{font-size:15px;letter-spacing:-.2px}.intro-note p{font-size:12px;line-height:1.8;color:var(--muted);margin:8px 0 0}.tricolor-rule{display:block;height:4px;border-radius:4px;background:linear-gradient(to right,var(--der) 0 33.333%,var(--die) 33.333% 66.666%,var(--das) 66.666% 100%)}
.studio-layout{display:grid;grid-template-columns:minmax(0,1fr) 324px;gap:28px;align-items:start}.word-library{min-width:0}.section-heading{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:22px}.step-label{font-size:9px;margin:0 0 7px;letter-spacing:1.4px}h2{font-size:22px;line-height:1.2;letter-spacing:-.6px;margin:0;font-weight:700}.library-total{font-size:11px;color:#727272;border:1px solid var(--line);padding:7px 10px;border-radius:20px;background:#fff}.library-controls{background:#fff;border:1px solid var(--line);border-radius:12px;padding:13px}.search-control{display:flex;align-items:center;gap:10px}.search-control svg{color:#777;flex-shrink:0;margin-left:6px}.search-control input{width:100%;border:0;background:transparent;min-height:39px;padding:5px 8px;font-size:14px;color:var(--ink)}.search-control input::placeholder{color:#8b8b8b}.filter-row{display:flex;gap:12px;align-items:center;border-top:1px solid #efefef;margin-top:9px;padding-top:12px}.filter-row>label{flex:1;min-width:0}.filter-row select{width:100%;border:0;color:#5e5e5e;background:#f6f6f6;padding:11px 28px 11px 11px;border-radius:7px;font-size:12px;text-overflow:ellipsis;min-height:40px}.article-filter{display:flex;gap:2px;border:0;padding:0;margin:0}.article-filter label{position:relative}.article-filter input{position:absolute;inset:0;width:100%;height:100%;margin:0;opacity:0;cursor:pointer}.article-filter span{display:flex;align-items:center;justify-content:center;border:1px solid transparent;min-height:40px;min-width:40px;border-radius:7px;font-size:12px;font-weight:700;padding:7px}.article-filter input:checked+span{background:#f0f0f0;border-color:#dedede}.article-filter input:focus-visible+span{outline:3px solid #555;outline-offset:2px}.der{color:var(--der)}.die{color:var(--die)}.das{color:var(--das)}
.results-toolbar{display:flex;align-items:center;justify-content:space-between;gap:8px;min-height:58px;font-size:12px;color:#777}.text-button{color:#515151;min-height:36px;border:0;background:transparent;text-decoration:underline;text-underline-offset:4px;padding:6px 0;font-size:11px;font-weight:650}.text-button:hover{color:#111}.word-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.word-option{position:relative;min-width:0;display:block;cursor:pointer;border:1px solid var(--line);border-radius:12px;background:#fff;padding:12px 12px 14px;transition:border-color .15s,box-shadow .15s,transform .15s}.word-option:hover{transform:translateY(-2px);border-color:#aaa;box-shadow:0 6px 16px #00000004}.word-option.is-selected{border-color:#393939;box-shadow:inset 0 0 0 1px #393939}.word-option input{position:absolute;top:11px;right:11px;width:19px;height:19px;margin:0;accent-color:#333;z-index:1;cursor:pointer}.word-option input:focus-visible{outline-offset:4px}.word-option img{display:block;aspect-ratio:1;width:100%;height:auto;object-fit:contain;margin:5px auto 8px;max-height:132px}.word-name{display:block;font-size:15px;font-weight:690;letter-spacing:-.25px;overflow-wrap:anywhere;line-height:1.4}.word-name b{font-size:12px;font-weight:700;margin-right:3px}.word-english{display:block;font-size:11px;line-height:1.4;color:#858585;margin-top:2px;overflow-wrap:anywhere}.word-empty{grid-column:1/-1;min-height:230px;display:grid;align-content:center;justify-items:center;text-align:center;border:1px dashed #d8d8d8;border-radius:12px;padding:24px}.word-empty strong{font-size:18px;font-weight:600}.word-empty p{font-size:13px;color:#777;line-height:1.7;margin:8px 0}.word-empty button{margin-top:12px}.library-footer{display:flex;flex-direction:column;align-items:center;gap:12px;padding:24px 0;font-size:11px;color:#8a8a8a}.secondary-button{border:1px solid #d4d4d4;border-radius:9px;min-height:44px;padding:11px 25px;background:#fff;color:#424242;font-size:12px;font-weight:650}.secondary-button:hover{border-color:#555}
.lesson-panel{position:sticky;top:24px;border:1px solid var(--line);border-radius:var(--radius);background:#fff;padding:26px 23px 21px;box-shadow:0 6px 28px #00000003;overflow:hidden}.lesson-panel>.tricolor-rule{position:absolute;top:0;left:0;right:0;height:4px;border-radius:0}.lesson-panel .section-heading{margin-bottom:23px}.lesson-panel h2{font-size:21px}.count-badge{min-width:31px;height:31px;display:grid;place-items:center;background:#f1f1f1;border:1px solid #e9e9e9;border-radius:9px;font-size:12px;font-weight:700}.field-label{display:block;font-size:11px;font-weight:700;margin-bottom:8px}.title-input{min-height:44px;border:1px solid #d9d9d9;background:#fcfcfc;width:100%;border-radius:8px;color:var(--ink);padding:11px 12px;font-size:13px}.field-hint{font-size:10px;line-height:1.5;color:#898989;margin:8px 0 24px}.selection-heading{display:flex;justify-content:space-between;align-items:center;gap:8px;padding-top:18px;border-top:1px solid #eee}.selection-heading strong{font-size:11px}.selection-heading .text-button{font-size:10px}.selected-words{max-height:273px;overflow:auto;overscroll-behavior:contain;scrollbar-width:thin}.selection-empty{text-align:center;padding:29px 8px 30px;color:#8b8b8b}.selection-empty>span{width:34px;height:34px;border:1px dashed #cfcfcf;border-radius:50%;display:inline-grid;place-items:center;font-size:21px;font-weight:300;color:#aaa}.selection-empty p{font-size:12px;margin:15px 0 6px;font-weight:600;color:#6d6d6d}.selection-empty small{font-size:10px;line-height:1.6;display:block;max-width:205px;margin:auto}.selected-row{display:flex;gap:9px;align-items:center;padding:6px 0;border-bottom:1px solid #f1f1f1;min-width:0}.selected-row img{height:36px;width:36px;object-fit:contain;flex-shrink:0}.selected-row .selected-label{flex:1;min-width:0}.selected-row strong{font-size:12px;font-weight:650;overflow-wrap:anywhere;line-height:1.5;display:block}.selected-row strong b{font-size:10px}.selected-row small{color:#929292;font-size:9px;display:block;overflow-wrap:anywhere;line-height:1.4}.remove-word{min-width:32px;height:36px;border:0;background:transparent;color:#939393;font-size:21px;flex-shrink:0;border-radius:6px}.remove-word:hover{background:#f3f3f3;color:#333}.lesson-limit{font-size:10px;text-align:right;color:#999;margin:10px 0 18px}.share-section{border-top:1px solid #eee;padding-top:21px}.share-section .step-label{margin-bottom:12px}.primary-button{width:100%;min-height:48px;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:13px 15px;border:1px solid #252525;border-radius:9px;background:#252525;color:white;font-size:12px;font-weight:650}.primary-button:hover:enabled{background:#444}.primary-button span{font-size:19px;font-weight:400;line-height:1}.preview-link{display:block;text-align:center;font-size:11px;font-weight:600;text-underline-offset:4px;padding:15px 5px 5px;min-height:40px}.preview-link[hidden]{display:none}.share-note{font-size:10px;line-height:1.7;text-align:center;color:#999;margin:13px 0 0}.share-fallback{margin-top:18px;font-size:11px}.share-fallback label{display:block;margin-bottom:7px;font-weight:600}.share-fallback input{width:100%;border:1px solid var(--line);border-radius:6px;min-height:40px;padding:7px;font-size:11px}.share-fallback p{font-size:10px;color:#777}.studio-message{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);z-index:20;max-width:min(90vw,520px);padding:13px 20px;border-radius:10px;background:#262626;color:#fff;font-size:12px;line-height:1.5;box-shadow:0 5px 30px #0002;text-align:center;pointer-events:none}.studio-message:empty{display:none}.studio-bottom{border-top:1px solid var(--line);margin-top:18px;padding:33px 0 0;display:flex;justify-content:space-between;gap:36px;align-items:center}.studio-bottom h2{font-size:18px;letter-spacing:-.4px}.studio-bottom p{max-width:560px;font-size:12px;line-height:1.8;color:#7b7b7b;margin:10px 0 0}.studio-bottom>a{flex-shrink:0;font-size:11px;font-weight:650;text-underline-offset:5px}.studio-footer{max-width:1184px;margin:auto;padding:20px 0 30px;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:20px;font-size:10px;color:#8a8a8a}.studio-footer a{text-underline-offset:3px}.noscript{position:fixed;bottom:0;background:white;padding:20px;width:100%;text-align:center;border-top:1px solid var(--line)}
@media(min-width:1250px){.word-grid{grid-template-columns:repeat(4,minmax(0,1fr))}.word-option{padding:10px 10px 13px}.word-name{font-size:14px}.word-english{font-size:10px}}
@media(max-width:1000px){.studio-header{padding:20px 26px}.studio-main{padding:0 26px 32px}.studio-layout{grid-template-columns:minmax(0,1fr) 290px;gap:20px}.lesson-panel{padding:25px 18px 20px}.word-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.studio-footer{margin:0 26px}.studio-intro{gap:30px}.intro-note{flex-basis:210px}.filter-row{flex-wrap:wrap;gap:8px}.filter-row>label{flex-basis:100%}.article-filter{width:100%}.article-filter label{flex:1}}
@media(max-width:720px){.studio-header{min-height:84px;padding:16px 20px;align-items:flex-start;gap:15px;flex-wrap:wrap}.studio-brand{font-size:17px}.brand-caption{font-size:10px}.studio-header nav{width:100%;justify-content:space-between;gap:6px}.studio-header nav a{font-size:11px;padding:10px 12px;min-height:38px}.studio-main{padding:0 20px 26px}.studio-intro{display:block;padding:34px 0 30px}.eyebrow{font-size:9px;margin-bottom:13px}h1{font-size:36px;letter-spacing:-1.5px}.intro-copy{font-size:13px;margin-top:17px;line-height:1.7;max-width:470px}.intro-note{border:0;padding:0;display:none}.studio-layout{grid-template-columns:minmax(0,1fr);gap:26px}.section-heading{margin-bottom:18px}h2{font-size:21px}.word-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:9px}.word-option{padding:10px 9px 12px;border-radius:10px}.word-option img{margin-top:14px}.word-name{font-size:13px;letter-spacing:-.2px}.word-name b{font-size:10px}.word-english{font-size:10px}.word-option input{width:17px;height:17px;top:9px;right:9px}.filter-row{flex-wrap:nowrap}.filter-row>label{flex-basis:auto}.article-filter{width:auto}.lesson-panel{position:relative;top:auto;padding:26px 22px 22px}.selected-words{max-height:272px}.selected-row img{height:40px;width:40px}.selected-row strong{font-size:13px}.selected-row small{font-size:10px}.field-label{font-size:12px}.title-input{font-size:14px}.field-hint{font-size:11px}.share-note{font-size:11px}.primary-button{font-size:13px}.studio-bottom{display:block;margin-top:30px}.studio-bottom>a{display:inline-block;margin-top:18px;min-height:35px;font-size:12px}.studio-footer{margin:0 20px;line-height:1.7;font-size:9px;align-items:flex-start}}
@media(max-width:420px){.word-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.word-option{padding:12px}.word-name{font-size:15px}.word-name b{font-size:11px}.word-option img{max-height:140px}.word-english{font-size:11px}.filter-row{flex-wrap:wrap}.filter-row>label{flex-basis:100%}.article-filter{width:100%}h1{font-size:32px}.studio-header,.studio-main{padding-left:18px;padding-right:18px}.studio-footer{margin:0 18px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;transition:none!important;animation:none!important}}
/* On a small screen the selection remains one tap away while browsing. */
.mobile-lesson-summary{display:none}
@media(max-width:720px){body:has(.mobile-lesson-summary:not([hidden])){padding-bottom:80px}.mobile-lesson-summary:not([hidden]){display:flex;align-items:center;justify-content:space-between;gap:12px;position:fixed;z-index:15;left:18px;right:18px;bottom:calc(14px + env(safe-area-inset-bottom,0px));min-height:52px;padding:14px 16px;border:1px solid #333;border-radius:11px;color:#fff;background:#292929;box-shadow:0 4px 24px #0002;text-decoration:none;font-size:12px;overflow:hidden}.mobile-lesson-summary::before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(to right,var(--der) 0 33.333%,var(--die) 33.333% 66.666%,var(--das) 66.666% 100%)}.mobile-lesson-summary>span{color:#d6d6d6}.mobile-lesson-summary strong{font-size:12px;font-weight:650}.mobile-lesson-summary strong span{margin-left:5px}.studio-message{bottom:calc(85px + env(safe-area-inset-bottom,0px))}.lesson-panel{scroll-margin-top:18px}}
/* Language is a local preference; lesson content and selection stay in place. */
.studio-header-tools{display:flex;align-items:center;gap:18px}.studio-language-switch{display:inline-flex;flex-shrink:0;gap:2px;border:1px solid var(--line);padding:3px;border-radius:9px;background:#fff}.studio-language-switch button{min-width:34px;min-height:34px;padding:6px;border:0;border-radius:6px;color:#777;background:transparent;font-size:10px;font-weight:750}.studio-language-switch button[aria-pressed="true"]{background:#292929;color:#fff}.primary-button>.button-label{font-size:inherit;font-weight:inherit}.mobile-lesson-summary strong span[data-i18n]{margin-left:0}
@media(max-width:1000px){.studio-header-tools{gap:10px}.studio-header nav{gap:1px}.studio-header nav a{font-size:12px;padding:11px 10px}}
@media(max-width:720px){.studio-header-tools{width:100%;display:flex;justify-content:space-between;gap:10px}.studio-header-tools nav{width:auto;justify-content:flex-start;flex-wrap:wrap;flex:1;min-width:0}.studio-header nav a{position:relative;display:inline-flex;align-items:center;justify-content:center;font-size:10px;line-height:1.2;padding:6px 7px;min-height:30px}.studio-language-switch button{min-width:29px;min-height:32px;font-size:9px}.studio-intro h1{overflow-wrap:anywhere}.library-total{white-space:nowrap}.lesson-panel .preview-link{line-height:1.6}.section-heading{gap:9px}.section-heading>div{min-width:0}}
@media(max-width:360px){.studio-header-tools{gap:5px}.studio-header nav a{font-size:9px;padding:6px 5px}.studio-language-switch{padding:2px}.studio-language-switch button{min-width:26px}.library-total{font-size:9px;padding:7px 8px}.section-heading h2{font-size:19px}}
/* Article counts describe the selected lesson, independently of library filters. */
.lesson-balance { margin: 0 0 18px; padding: 15px 0 0; border-top: 1px solid var(--line); }
.balance-heading { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; margin-bottom: 11px; }
.balance-heading h3 { margin: 0; font-size: 11px; font-weight: 650; }
.balance-heading > span { color: #777; font-size: 10px; white-space: nowrap; }
.article-distribution { display: flex; width: 100%; height: 8px; overflow: hidden; border-radius: 99px; background: #efefef; }
.article-distribution > span { display: block; height: 100%; flex: 0 0 auto; }
.balance-der { background: var(--der); }
.balance-die { background: var(--die); }
.balance-das { background: var(--das); }
.article-counts { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 12px; padding: 0; margin: 12px 0 0; list-style: none; }
.article-counts li { display: grid; grid-template-columns: minmax(0,1fr) auto; align-items: baseline; gap: 4px; }
.balance-label { display: flex; align-items: center; gap: 5px; font-size: 11px; font-weight: 650; }
.balance-label i { width: 5px; height: 5px; border-radius: 50%; background: currentColor; }
.article-counts strong { color: var(--ink); font-size: 13px; font-weight: 650; font-variant-numeric: tabular-nums; }
.article-counts small { grid-column: 1/-1; padding-left: 10px; color: #777; font-size: 10px; font-variant-numeric: tabular-nums; }
.balance-hint { margin: 12px 0 0; color: #777; font-size: 10px; line-height: 1.6; }
.balance-hint[hidden] { display: none; }
@media(min-width:721px) { .lesson-panel { max-height: calc(100dvh - 48px); overflow-y: auto; scrollbar-width: thin; } }
.lesson-panel:focus-visible { outline: 2px solid #444; outline-offset: 3px; }
.search-control:focus-within { outline: 2px solid #555; outline-offset: 3px; }
.search-control input:focus { outline: none; }
/* Keep the teacher task explicit and the word request next to the library. */
.studio-intro { padding: 38px 0 30px; }
.studio-intro h1 { font-size: 28px; line-height: 1.3; letter-spacing: -.6px; font-weight: 650; }
.studio-intro .studio-heading-primary { display: block; color: var(--ink); }
.studio-intro .studio-heading-secondary { display: block; color: #656565; font-size: 22px; font-weight: 500; letter-spacing: -.35px; }
.studio-intro .intro-copy { margin-top: 13px; font-size: 14px; }
.intro-note { padding-block: 12px; }
.library-word-request { display: flex; align-items: center; flex-wrap: wrap; gap: 8px; min-height: 46px; margin-top: 12px; padding-top: 12px; border-top: 1px solid #efefef; color: #686868; font-size: 11px; }
.library-word-request a { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 36px; padding: 8px 11px; border: 1px solid #dcdcdc; border-radius: 7px; background: #f7f7f7; color: #333; font-size: 11px; font-weight: 650; text-decoration: none; }
.library-word-request a:hover { border-color: #999; background: #efefef; }
.library-word-request a > [aria-hidden] { font-size: 15px; line-height: 1; }
@media(max-width:720px) { .studio-intro { padding: 28px 0 25px; } .studio-intro h1 { font-size: 25px; } .studio-intro .studio-heading-secondary { font-size: 18px; letter-spacing: -.3px; } .studio-intro .intro-copy { font-size: 13px; } }
@media(max-width:360px) { .studio-intro h1 { font-size: 23px; } .studio-intro .studio-heading-secondary { font-size: 16px; letter-spacing: -.25px; } }

/* Keep mobile navigation compact while retaining a 44px tap area. */
@media(max-width:720px){.studio-header nav a::after{content:"";position:absolute;inset:-7px 0}}