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--tw-shadow-color{syntax:"*";inherits:false}@property --tw-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-inset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-shadow-color{syntax:"*";inherits:false}@property --tw-inset-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-ring-color{syntax:"*";inherits:false}@property --tw-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-ring-color{syntax:"*";inherits:false}@property --tw-inset-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-ring-inset{syntax:"*";inherits:false}@property --tw-ring-offset-width{syntax:"<length>";inherits:false;initial-value:0}@property --tw-ring-offset-color{syntax:"*";inherits:false;initial-value:#fff}@property --tw-ring-offset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-outline-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-blur{syntax:"*";inherits:false}@property --tw-brightness{syntax:"*";inherits:false}@property --tw-contrast{syntax:"*";inherits:false}@property --tw-grayscale{syntax:"*";inherits:false}@property --tw-hue-rotate{syntax:"*";inherits:false}@property --tw-invert{syntax:"*";inherits:false}@property --tw-opacity{syntax:"*";inherits:false}@property --tw-saturate{syntax:"*";inherits:false}@property --tw-sepia{syntax:"*";inherits:false}@property --tw-drop-shadow{syntax:"*";inherits:false}@property --tw-drop-shadow-color{syntax:"*";inherits:false}@property --tw-drop-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-drop-shadow-size{syntax:"*";inherits:false}:root{--font-geist-sans:-apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--font-geist-mono:"SFMono-Regular", Consolas, monospace;--ws-canvas:#f5f6f8;--ws-surface:#fff;--ws-soft:#edf1f7;--ws-ink:#202e46;--ws-muted:#647187;--ws-line:#e1e6ee;--ws-blue:#355cda;--ws-blue-soft:#eaf0ff;--ws-green:#bdea84;--ws-shadow:0 5px 24px #263b5b05}.wordspring-dark{--ws-canvas:#101722;--ws-surface:#182231;--ws-soft:#202e42;--ws-ink:#edf3ff;--ws-muted:#a7b6cb;--ws-line:#2c3b50;--ws-blue:#aac0ff;--ws-blue-soft:#243657;--ws-green:#bdea84;--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark}html,body{background:var(--ws-canvas)}body{color:var(--ws-ink);-webkit-font-smoothing:antialiased;background-image:none}body:has([role=dialog][aria-modal=true]){overflow:hidden}button,input,textarea,select{font:inherit}button{touch-action:manipulation}button:disabled{cursor:default;opacity:.5}input,textarea,select{accent-color:var(--ws-blue)}.spring-workspace.spring-next{--app-bg:var(--ws-canvas);--app-ink:var(--ws-ink);--app-muted:var(--ws-muted);--app-line:var(--ws-line);--app-elevated:var(--ws-surface);--app-subtle:var(--ws-soft);--app-blue:#355cda;--app-yellow:#bdea84;--ink-canvas:var(--ws-canvas);--ink-porcelain:var(--ws-surface);--ink-midnight:var(--ws-ink);--ink-brass-deep:var(--ws-blue);--ink-brass:#bdea84;background:var(--ws-canvas);width:100%;max-width:none;min-height:100dvh;color:var(--ws-ink);margin:0;font-size:15px;line-height:1.65}.spring-next .app-topbar{border-bottom:1px solid var(--ws-line);background:var(--ws-surface);height:82px;min-height:82px;box-shadow:none;z-index:40;align-items:center;gap:24px;padding:0 30px;display:flex}.spring-next .app-home-button{color:var(--ws-ink);flex:0 0 210px;gap:11px}.spring-next .app-brand-icon{color:#fff;background:#355cda;border-radius:13px;width:40px;height:43px;font-size:25px;box-shadow:0 3px 8px #355cda18}.spring-next .app-home-button>span:last-child{letter-spacing:-.9px;font-size:22px;font-weight:750}.spring-next .app-home-button small{color:var(--ws-muted);letter-spacing:.07em;font-size:10px;font-weight:500}.workspace-topbar-caption{color:var(--ws-muted);flex:1;font-size:13px}.workspace-topbar-caption span{letter-spacing:.18em;margin-top:1px;font-size:9px;display:block}.spring-next .app-topbar-actions{gap:10px;margin-left:auto}.workspace-search{border:1px solid var(--ws-line);min-height:42px;color:var(--ws-muted);background:var(--ws-canvas);border-radius:11px;align-items:center;gap:10px;padding:8px 12px;font-size:13px;display:flex}.workspace-search svg{width:17px;height:17px}.workspace-search kbd{font:11px var(--font-geist-mono);border:1px solid var(--ws-line);border-radius:4px;margin-left:20px;padding:0 5px}.workspace-theme{border:1px solid var(--ws-line);background:var(--ws-surface);width:42px;height:42px;color:var(--ws-ink);border-radius:11px;place-items:center;display:grid}.spring-next .app-account-action,.spring-next .app-install-action{border:1px solid var(--ws-line);min-height:42px;box-shadow:none;background:var(--ws-surface);color:var(--ws-ink);border-radius:11px}.spring-next .app-account-action small,.spring-next .app-install-action small{font-size:12px}.spring-next .desktop-app-tabs{width:208px;height:auto;box-shadow:none;background:0 0;border:0;flex-direction:column;align-items:stretch;gap:8px;padding:0;display:flex;position:fixed;top:116px;left:24px}.spring-next .desktop-app-tabs:before{content:"YOUR WORKSPACE";letter-spacing:.15em;color:var(--ws-muted);padding:0 15px 16px;font-size:10px;display:block}.spring-next .desktop-app-tabs button{text-align:left;width:100%;min-height:70px;color:var(--ws-muted);background:0 0;border:1px solid #0000;border-radius:13px;justify-content:flex-start;align-items:center;gap:13px;padding:13px 15px;font-size:15px;font-weight:600;transition:background .16s,color .16s;display:flex}.spring-next .desktop-app-tabs button:after{display:none}.spring-next .desktop-app-tabs button:hover{background:var(--ws-soft);color:var(--ws-ink)}.spring-next .desktop-app-tabs button.active{background:var(--ws-surface);color:var(--ws-blue);border-color:var(--ws-line);box-shadow:var(--ws-shadow)}.spring-next .desktop-app-tabs svg{flex:0 0 23px}.workspace-nav-label{gap:2px;display:grid}.workspace-nav-label small{color:var(--ws-muted);white-space:nowrap;font-size:10px;font-weight:400}.workspace-nav-count{background:var(--ws-blue-soft);color:var(--ws-blue);border-radius:6px;margin-left:auto;padding:0 6px;font-size:11px}.workspace-sidebar-note{z-index:10;border:1px solid var(--ws-line);background:var(--ws-soft);border-radius:16px;width:195px;padding:19px;position:fixed;bottom:28px;left:30px}.workspace-sidebar-note>span{letter-spacing:.16em;color:var(--ws-muted);font-size:8px}.workspace-sidebar-note>strong{margin:8px 0;font-size:13px;display:block}.workspace-sidebar-note p{color:var(--ws-muted);margin:0 0 18px;font-size:11px;line-height:1.9}.workspace-sidebar-note div{color:var(--ws-muted);align-items:baseline;gap:4px;font-size:11px;display:flex}.workspace-sidebar-note b{color:var(--ws-ink);font-size:23px;font-weight:650}.workspace-sidebar-note small{margin-left:auto;font-size:10px}.workspace-sidebar-note progress{border:0;border-radius:4px;width:100%;height:5px;margin-top:9px;display:block;overflow:hidden}.spring-next .app-view{width:calc(100% - 256px);max-width:1320px;margin:0 0 0 256px;padding:21px 40px 65px}.workspace-utility-bar{color:var(--ws-muted);justify-content:space-between;align-items:center;gap:12px;margin-bottom:26px;font-size:11px;display:flex}.workspace-utility-bar>span{align-items:center;gap:8px;display:flex}.workspace-utility-bar>span>i{background:var(--ws-blue);border-radius:50%;width:5px;height:5px}.workspace-sync{color:var(--ws-muted);background:0 0;border:0;align-items:center;gap:7px;padding:6px 0 6px 10px;font-size:11px;display:inline-flex}.workspace-sync:disabled{opacity:1}.workspace-sync>i{background:#8c99ad;border-radius:50%;width:5px;height:5px}.workspace-sync.saved>i{background:#329c73}.workspace-sync.saving>i{background:#7493e9;animation:1.3s infinite ws-pulse}.workspace-sync.offline>i{background:#c39242}.workspace-save-notice,.workspace-resume{background:var(--ws-blue-soft);color:var(--ws-ink);border-radius:12px;flex-wrap:wrap;align-items:center;gap:12px;margin-bottom:20px;padding:14px 18px;font-size:13px;display:flex}.workspace-save-notice button,.workspace-resume button,.workspace-save-notice a{background:var(--ws-surface);color:var(--ws-blue);border:0;border-radius:8px;margin-left:auto;padding:8px 12px;font-size:12px}.workspace-loading{color:var(--ws-muted);font-size:12px}.spring-next .spring-heading{align-items:center;gap:20px;margin-bottom:26px}.spring-next .spring-eyebrow{color:var(--ws-blue);letter-spacing:.17em;font-size:9px;font-weight:650;display:block}.spring-next .spring-heading h1,.spring-next .screen-intro h1{letter-spacing:-.04em;color:var(--ws-ink);margin:10px 0 7px;font-size:clamp(25px,2.4vw,35px);font-weight:700;line-height:1.4}.spring-next .spring-heading p,.spring-next .screen-intro p{color:var(--ws-muted);font-size:13px;line-height:1.9}.spring-next .spring-focus-toggle{border:1px solid var(--ws-line);background:var(--ws-surface);min-height:40px;color:var(--ws-ink);white-space:nowrap;box-shadow:var(--ws-shadow);border-radius:10px;padding:9px 14px;font-size:11px}.spring-next .spring-focus-toggle[aria-pressed=true]{background:var(--ws-blue-soft);color:var(--ws-blue)}.spring-next .spring-overview{grid-template-columns:1.5fr 1fr;gap:20px;margin-bottom:24px}.spring-next .ink-study-hero{isolation:isolate;min-height:257px;box-shadow:none;background:#253c78;border:0;border-radius:19px;position:relative;overflow:hidden}.spring-next .ink-study-hero:after{content:"";z-index:-1;border:1px solid #ffffff12;border-radius:50%;width:280px;height:280px;position:absolute;top:-180px;right:-70px;box-shadow:0 0 0 35px #ffffff05,0 0 0 70px #ffffff03}.spring-next .ink-study-copy{flex-direction:column;min-height:257px;padding:30px;display:flex}.spring-next .ink-kicker{color:#cbd9fc;letter-spacing:.08em;align-items:center;gap:7px;font-size:10px;font-weight:500;display:flex}.spring-next .ink-kicker i{background:var(--ws-green);border-radius:50%;width:5px;height:5px}.spring-next .ink-study-copy h2{letter-spacing:-.04em;color:#fff;margin:20px 0 8px;font-size:clamp(24px,2vw,31px);font-weight:650;line-height:1.45}.spring-next .ink-study-copy>p{color:#cbd7f0;max-width:360px;margin:0;font-size:12px}.spring-next .spring-task-bottom{margin-top:auto;padding-top:23px}.spring-next .spring-task-bottom>span{color:#cbd7f0;font-size:11px}.spring-next .ink-primary-action{background:var(--ws-green);color:#24391b;border:0;border-radius:10px;gap:28px;min-height:46px;padding:11px 16px;font-size:13px}.spring-next .ink-primary-action b{font-size:23px;font-weight:400}.spring-next .spring-stats{gap:14px}.spring-next .spring-stats>*{background:var(--ws-surface);border:1px solid var(--ws-line);box-shadow:var(--ws-shadow);border-radius:15px;padding:19px}.spring-next .spring-stats span{color:var(--ws-muted);font-size:11px}.spring-next .spring-stats strong{color:var(--ws-ink);margin-top:8px;font-size:32px;font-weight:650;line-height:1.3}.spring-next .spring-stats strong small{color:var(--ws-muted);font-size:11px;font-weight:400}.spring-next .spring-stats progress{height:5px;margin-top:13px}.spring-next .ink-today-panel{border:1px solid var(--ws-line);background:var(--ws-surface);box-shadow:var(--ws-shadow);border-radius:17px;margin-bottom:29px;padding:21px 24px 15px}.spring-next .ink-today-panel>header{border:0;margin-bottom:18px;padding:0}.spring-next .ink-today-panel>header span{letter-spacing:.17em;color:var(--ws-blue);font-size:8px}.spring-next .ink-today-panel h2{color:var(--ws-ink);margin-top:3px;font-size:17px}.spring-next .ink-today-panel>header button{color:var(--ws-blue);font-size:11px}.spring-next .ink-today-list{grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;display:grid}.spring-next .ink-today-list>button{border:1px solid var(--ws-line);background:var(--ws-canvas);color:var(--ws-ink);border-radius:11px;align-items:center;gap:11px;padding:15px 12px;display:flex}.spring-next .ink-today-list>button>span{background:var(--ws-blue-soft);width:29px;height:30px;color:var(--ws-blue);border-radius:9px;flex-shrink:0;place-items:center;font-size:10px;display:grid}.spring-next .ink-today-list strong{color:var(--ws-ink);font-size:12px}.spring-next .ink-today-list small{color:var(--ws-muted);margin-top:2px;font-size:9px;display:block}.spring-next .ink-today-list b{color:var(--ws-ink);white-space:nowrap;margin-left:auto;font-size:22px;font-weight:500}.spring-next .ink-today-list b small{margin-left:3px;display:inline}.spring-next .ink-today-list i{display:none}.spring-next .ink-week-rhythm{border-top:1px solid var(--ws-line);justify-content:space-between;align-items:center;margin-top:18px;padding-top:13px;display:flex}.spring-next .ink-week-rhythm>strong{color:var(--ws-muted);font-size:10px;font-weight:400}.spring-next .ink-week-rhythm>div{gap:16px;display:flex}.spring-next .ink-week-rhythm span{color:var(--ws-muted);flex-direction:row;align-items:center;gap:5px;font-size:10px;display:flex}.spring-next .ink-week-rhythm i{border:1px solid var(--ws-line);background:var(--ws-canvas);border-radius:50%;place-items:center;width:15px;height:15px;font-size:9px;font-style:normal;display:grid}.spring-next .ink-week-rhythm .today{color:var(--ws-blue);font-weight:600}.spring-next .ink-week-rhythm .today i{border-color:var(--ws-blue)}.spring-next .ink-week-rhythm .practiced i{background:var(--ws-blue);border-color:var(--ws-blue);color:var(--ws-surface)}.spring-next .study-progress{margin:0 0 18px}.spring-next .study-progress>div:first-child{color:var(--ws-muted);margin-bottom:9px;font-size:11px}.spring-next .progress-track{background:var(--ws-line);height:4px}.spring-next .progress-track i{background:var(--ws-blue)}.spring-next .study-session{grid-template-columns:1.08fr 1fr;gap:22px}.spring-next .study-session.session-complete{display:none}.spring-next .card-stepper{margin:0 0 11px}.spring-next .card-stepper button{border:1px solid var(--ws-line);background:var(--ws-surface);width:36px;height:36px;color:var(--ws-ink);border-radius:9px}.spring-next .card-stepper>span{color:var(--ws-muted);font-size:11px}.spring-next .study-screen .flashcard{border:1px solid var(--ws-line);background:var(--ws-surface);min-height:325px;color:var(--ws-ink);box-shadow:var(--ws-shadow);border-radius:17px;padding:29px}.spring-next .study-screen .flashcard:before,.spring-next .study-screen .flashcard:after{display:none}.spring-next .study-screen .flashcard>strong{letter-spacing:-.035em;color:var(--ws-ink);font-size:clamp(30px,4vw,54px);font-weight:600;line-height:1.25}.spring-next .study-screen .flashcard .answer-zh{font-size:clamp(25px,2.4vw,37px)}.spring-next .flashcard .card-number,.spring-next .flashcard .card-category{color:var(--ws-muted);font-size:10px}.spring-next .flashcard .flip-hint{color:var(--ws-blue);font-size:11px}.spring-next .flashcard.is-revealed{background:var(--ws-blue-soft)}.spring-next .study-panel{border:1px solid var(--ws-line);background:var(--ws-surface);box-shadow:var(--ws-shadow);border-radius:17px;padding:24px}.spring-next .study-context{background:var(--ws-soft);border:0;border-radius:10px;padding:15px}.spring-next .study-context>strong{color:var(--ws-ink);letter-spacing:-.03em;font-size:27px}.spring-next .study-context>small,.spring-next .study-context>span,.spring-next .status-note{color:var(--ws-muted);font-size:10px}.spring-next .recall-cue{border-color:var(--ws-line)}.spring-next .recall-cue>span{color:var(--ws-blue);font-size:10px}.spring-next .recall-cue strong{color:var(--ws-ink);font-size:14px}.spring-next .recall-cue p{color:var(--ws-muted);font-size:11px;line-height:1.85}.spring-next .study-actions{gap:10px}.spring-next .known-button,.spring-next .builder-quiz-button{color:#fff;min-height:46px;box-shadow:none;background:#355cda;border-color:#355cda;border-radius:10px;font-size:12px}.spring-next .review-button,.spring-next .builder-review-button{background:var(--ws-soft);color:var(--ws-ink);border:1px solid var(--ws-line);min-height:46px;box-shadow:none;border-radius:10px;font-size:12px}.spring-next .gesture-hint{color:var(--ws-muted);font-size:10px}.workspace-session-result{text-align:center;background:var(--ws-surface);border:1px solid var(--ws-line);border-radius:18px;margin-bottom:25px;padding:35px 22px}.workspace-result-check{color:#3e6b24;background:#e4f3d7;border-radius:50%;place-items:center;width:52px;height:52px;margin:0 auto 20px;font-size:26px;display:grid}.workspace-session-result h2{margin:8px 0;font-size:24px}.workspace-session-result p,.workspace-session-result>small{color:var(--ws-muted);font-size:12px}.workspace-session-result>div{justify-content:center;gap:10px;margin:20px 0;display:flex}.workspace-session-result>div>button{padding:10px 18px}.spring-next .screen-intro{margin-bottom:26px}.spring-next .screen-eyebrow{color:var(--ws-blue);letter-spacing:.16em;font-size:9px}.spring-next .screen-count{background:var(--ws-surface);border:1px solid var(--ws-line);color:var(--ws-ink);box-shadow:none;border-radius:13px}.spring-next .screen-count strong{font-size:27px}.spring-next .screen-count span{color:var(--ws-muted);font-size:10px}.spring-next .catalog-switch{border:1px solid var(--ws-line);background:var(--ws-surface);border-radius:13px;gap:6px;padding:6px}.spring-next .catalog-switch>button{min-height:65px;color:var(--ws-muted);background:0 0;border:0;border-radius:9px}.spring-next .catalog-switch>button.selected{background:var(--ws-blue-soft);color:var(--ws-blue);box-shadow:none}.spring-next .catalog-switch strong{font-size:13px}.spring-next .catalog-switch span{color:inherit;opacity:.8;font-size:10px}.spring-next .level-picker{gap:8px}.spring-next .level-picker>button,.spring-next .volume-picker>button,.spring-next .publisher-picker>button{border:1px solid var(--ws-line);background:var(--ws-surface);color:var(--ws-muted);box-shadow:none;border-radius:10px}.spring-next .level-picker>button.selected,.spring-next .volume-picker>button.selected,.spring-next .publisher-picker>button.selected{background:var(--ws-blue-soft);color:var(--ws-blue);border-color:var(--ws-blue)}.spring-next .level-picker>button.selected strong,.spring-next .publisher-picker>button.selected strong{color:var(--ws-blue)}.spring-next .search-box{background:var(--ws-surface);border:1px solid var(--ws-line);box-shadow:none;border-radius:11px}.spring-next .search-box:focus-within{outline:2px solid var(--ws-blue);outline-offset:2px}.spring-next .search-box input{color:var(--ws-ink);background:0 0;font-size:15px}.spring-next .library-tools{gap:12px}.spring-next .word-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:13px}.spring-next .word-tile{background:var(--ws-surface);border:1px solid var(--ws-line);box-shadow:var(--ws-shadow);contain-intrinsic-size:auto 200px;border-radius:13px;min-width:0;padding:18px;transition:border-color .15s,transform .15s}.spring-next .word-tile:hover{border-color:#a5b7e9;transform:translateY(-2px)}.spring-next .library-screen .word-tile h3{color:var(--ws-ink);letter-spacing:-.03em;margin-top:14px;font-size:25px}.spring-next .word-tile p{color:var(--ws-muted);font-size:12px}.spring-next .word-tile button{border-radius:8px;min-height:36px}.spring-next .spring-library-filters{gap:12px}.spring-next .spring-library-filters label{color:var(--ws-muted);font-size:11px}.spring-next .spring-library-filters select{min-height:42px;color:var(--ws-ink);background:var(--ws-surface);border-radius:9px;font-size:13px}.spring-next .custom-review-builder,.spring-next .review-summary-card,.spring-next .quiz-card,.spring-next .progress-overview,.spring-next .volume-progress-card,.spring-next .plan-card{border:1px solid var(--ws-line);background:var(--ws-surface);color:var(--ws-ink);box-shadow:var(--ws-shadow);border-radius:17px}.spring-next .review-source-switch{gap:8px}.spring-next .review-source-switch>button{background:var(--ws-canvas);border:1px solid var(--ws-line);color:var(--ws-ink);box-shadow:none;border-radius:10px;min-height:65px}.spring-next .review-source-switch>button.selected{background:var(--ws-blue-soft);color:var(--ws-blue);border-color:var(--ws-blue)}.spring-next .range-controls select{border:1px solid var(--ws-line);color:var(--ws-ink);background:var(--ws-surface);border-radius:10px;min-height:44px;font-size:14px}.spring-next .question-count button,.spring-next .quiz-config button{border:1px solid var(--ws-line);background:var(--ws-surface);color:var(--ws-muted);min-height:38px;box-shadow:none;border-radius:8px}.spring-next .question-count button.selected,.spring-next .quiz-config button.selected{color:#fff;background:#355cda;border-color:#355cda}.spring-next .quiz-options button{background:var(--ws-canvas);border:1px solid var(--ws-line);color:var(--ws-ink);box-shadow:none;border-radius:12px;min-height:65px;padding:15px;font-size:14px}.spring-next .quiz-options button>span{background:var(--ws-surface);border:1px solid var(--ws-line);color:var(--ws-muted);border-radius:8px;font-size:12px}.spring-next .quiz-options button.correct{color:#315927;opacity:1;background:#e9f5e2;border-color:#a3cc8c}.spring-next .quiz-options button.wrong{color:#943c2b;opacity:1;background:#fff0ed;border-color:#e6b2a5}.spring-next .interactive-quiz-card .quiz-word-line strong{color:var(--ws-ink);font-size:45px;font-weight:600}.spring-next .quiz-feedback{border-radius:11px;flex-wrap:wrap;align-items:center;gap:15px;display:flex}.spring-next .quiz-feedback>div{flex:1}.spring-next .quiz-feedback>button{border-radius:9px;min-height:44px}.workspace-quiz-example{border-top:1px solid 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