:root{--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark;--bg:#0a092d;--side:#0a092d;--surface:#2e3856;--surface-2:#3b4668;--field:#1f2044;--text:#f6f7fb;--muted:#a8b0d3;--line:#4a5578;--accent:#4255ff;--accent-ink:#fff;--link:#a8b1ff;--star:#ffcd1f;--ok:#23b26d;--ok-bg:#12382d;--err:#ff725b;--err-bg:#4a1f2a;--radius:12px;--font:system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif}@media (prefers-color-scheme:light){:root:not([data-theme=dark]){--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;--bg:#f6f7fb;--side:#fff;--surface:#fff;--surface-2:#eceefa;--field:#f1f2fb;--text:#282e3e;--muted:#586380;--line:#d9dde8;--accent:#4255ff;--accent-ink:#fff;--link:#3a35c9;--star:#e0a100;--ok:#14804a;--ok-bg:#e2f5ea;--err:#b42318;--err-bg:#fdeceb}}:root[data-theme=light]{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;--bg:#f6f7fb;--side:#fff;--surface:#fff;--surface-2:#eceefa;--field:#f1f2fb;--text:#282e3e;--muted:#586380;--line:#d9dde8;--accent:#4255ff;--accent-ink:#fff;--link:#3a35c9;--star:#e0a100;--ok:#14804a;--ok-bg:#e2f5ea;--err:#b42318;--err-bg:#fdeceb}*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{background:var(--bg);color:var(--text);font-family:var(--font);padding-left:max(16px, env(safe-area-inset-left,0px));padding-right:max(16px, env(safe-area-inset-right,0px));padding-block:env(safe-area-inset-top,0px) env(safe-area-inset-bottom,0px);margin:0;font-size:16px;line-height:1.5}h1{margin:0 0 .5rem;font-size:1.6rem;line-height:1.2}h2{margin:0 0 .5rem;font-size:1.05rem}p{margin:0 0 .75rem}a{color:var(--link)}.shell{max-width:760px;margin:0 auto}.topbar{justify-content:space-between;align-items:center;gap:12px;padding:12px 0;display:flex}.brand{color:var(--text);align-items:center;gap:10px;font-size:1.1rem;font-weight:700;text-decoration:none;display:inline-flex}.page{padding:4px 0 96px}.row.center{justify-content:center}.export-text{margin-top:12px}.hero{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;margin-bottom:12px;display:flex}.hero h1{margin:0}.muted{color:var(--muted)}.small{font-size:.85rem}.sr-only{clip:rect(0 0 0 0);white-space:nowrap;width:1px;height:1px;position:absolute;overflow:hidden}.panel{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);margin:0 0 14px;padding:16px}.panel.empty{text-align:center;padding:28px 18px}.danger-zone{background:0 0;border-style:dashed}.btn{border:1px solid var(--line);background:var(--surface-2);min-height:44px;color:var(--text);font:inherit;cursor:pointer;-webkit-tap-highlight-color:transparent;border-radius:12px;justify-content:center;align-items:center;gap:6px;padding:0 16px;font-weight:600;text-decoration:none;display:inline-flex}.btn.small{min-height:38px;padding:0 12px;font-size:.9rem}.btn.primary{background:var(--accent);border-color:var(--accent);color:var(--accent-ink)}.btn.ghost{background:0 0}.btn.danger{color:var(--err);border-color:var(--err);background:0 0}.btn:disabled{opacity:.5;cursor:not-allowed}.btn:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.row{align-items:center;gap:10px;margin-top:10px;display:flex}.row.wrap{flex-wrap:wrap}.field{border:0;flex-direction:column;gap:6px;min-width:0;margin:0 0 12px;padding:0;display:flex}.field>span,.field>legend{padding:0;font-size:.9rem;font-weight:600}input:not([type=checkbox]):not([type=radio]),select,textarea{border:1px solid var(--line);background:var(--field);width:100%;min-height:44px;color:var(--text);font:inherit;border-radius:10px;padding:10px 12px;font-size:16px}textarea{resize:vertical;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:15px}.check{cursor:pointer;align-items:center;gap:8px;min-height:36px;margin-right:14px;display:inline-flex}.check input{width:20px;height:20px;accent-color:var(--accent)}.grid2{grid-template-columns:1fr;gap:0 14px;display:grid}@media (width>=560px){.grid2{grid-template-columns:1fr 1fr}}.set-list,.preview{margin:0;padding:0;list-style:none}.set-list li+li{margin-top:10px}.set-item{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);color:var(--text);flex-direction:column;gap:2px;padding:14px 16px;text-decoration:none;display:flex}.set-list{margin-bottom:14px}.preview-row{border-top:1px solid var(--line);padding:12px 0}.preview-row:first-child{border-top:0}.pair{overflow-wrap:anywhere;flex-direction:column;gap:2px;margin-bottom:6px;display:flex}.answers-line{justify-content:space-between;align-items:center;gap:8px;display:flex}.chips{flex-wrap:wrap;gap:6px;margin:0;padding:0;list-style:none;display:flex}.chip{background:var(--surface-2);border:1px solid var(--line);overflow-wrap:anywhere;border-radius:999px;padding:3px 10px;font-size:.88rem}.edit{margin-top:8px}.title-field{margin:0}.title-input{font-weight:700;background:0 0!important;border-color:#0000!important;padding-left:0!important;font-size:1.5rem!important}.title-input:focus{background:var(--surface)!important;padding-left:12px!important}.prompt{overflow-wrap:anywhere;margin:14px 0 12px;font-size:1.4rem;font-weight:700}.notice{border-radius:10px;margin:12px 0 0;padding:10px 12px}.notice.ok{background:var(--ok-bg);color:var(--ok)}.notice.err{background:var(--err-bg);color:var(--err)}.sticky-actions{padding:12px 0 calc(12px + env(safe-area-inset-bottom));background:linear-gradient(to top, var(--bg) 70%, transparent);justify-content:flex-end;display:flex;position:sticky;bottom:0}.row.between{justify-content:space-between;align-items:center}.study-actions{margin:12px 0}.btn[aria-disabled=true]{opacity:.5;pointer-events:none}.star-btn{color:var(--muted,#888);cursor:pointer;background:0 0;border:0;border-radius:10px;padding:8px;line-height:0}.star-btn[aria-pressed=true]{color:var(--star)}.star-btn:focus-visible{outline:2px solid var(--accent)}.progress{background:var(--border,#80808040);border-radius:3px;height:6px;margin:8px 0 16px;overflow:hidden}.progress>div{background:var(--accent);height:100%;transition:width .2s}.flashcard{border:1px solid var(--border,#8080804d);background:var(--panel,var(--bg));cursor:pointer;text-align:center;-webkit-user-select:none;user-select:none;border-radius:18px;flex-direction:column;justify-content:center;align-items:center;gap:10px;min-height:240px;margin:8px 0 16px;padding:24px 16px;display:flex;box-shadow:0 2px 10px #00000014}.flashcard:focus-visible{outline:2px solid var(--accent)}.flashcard-side{letter-spacing:.08em;text-transform:uppercase;color:var(--muted,#888);font-size:.75rem}.flashcard-text{overflow-wrap:anywhere;white-space:pre-wrap;font-size:1.6rem;font-weight:600}.flashcard-hint{color:var(--muted,#888);font-size:.85rem}.write-prompt{overflow-wrap:anywhere;white-space:pre-wrap;margin:8px 0 12px;font-size:1.5rem;font-weight:600}.shell{grid-template-columns:minmax(0,1fr);max-width:none;margin:0;display:grid}.side{display:none}.content{width:100%;min-width:0;max-width:860px;margin:0 auto}.topbar{padding:12px 0}.add-btn{background:var(--accent);width:40px;height:40px;color:var(--accent-ink);border-radius:50%;justify-content:center;align-items:center;font-size:1.6rem;line-height:1;text-decoration:none;display:inline-flex}@media (width>=900px){.shell{grid-template-columns:250px minmax(0,1fr);gap:32px}.shell.focus{grid-template-columns:minmax(0,1fr)}.shell.focus .side{display:none}.side{align-self:start;height:100vh;padding:18px 0;display:block;position:sticky;top:0}.side .brand{margin-bottom:22px}.side nav{flex-direction:column;gap:6px;display:flex}.nav-item{color:var(--text);border-radius:10px;align-items:center;gap:14px;padding:12px 14px;font-weight:600;text-decoration:none;display:flex}.nav-item.on{background:var(--surface);color:var(--link)}.topbar .brand{display:none}.topbar{justify-content:flex-end}}.page-title{margin:8px 0 18px;font-size:2rem}.tabs-pills{flex-wrap:wrap;gap:10px;margin-bottom:18px;display:flex}.pill{background:var(--surface);border-radius:999px;align-items:center;min-height:40px;padding:0 18px;font-size:.95rem;font-weight:600;display:inline-flex}.pill.on{box-shadow:inset 0 0 0 2px var(--text)}.searchbox{margin:0 0 8px;display:block}.group{margin-top:22px}.group-title{letter-spacing:.1em;text-transform:uppercase;color:var(--muted);align-items:center;gap:14px;margin:0 0 10px;font-size:.78rem;font-weight:700;display:flex}.group-title:after{content:"";background:var(--line);opacity:.6;flex:1;height:1px}.set-list{flex-direction:column;gap:10px;margin:0;padding:0;list-style:none;display:flex}.set-list li+li{border:0}.set-item{background:var(--surface);color:var(--text);border:0;border-radius:8px;flex-direction:column-reverse;gap:4px;padding:14px 18px;text-decoration:none;display:flex}.set-title{font-size:1.15rem;font-weight:700}.set-meta{color:var(--muted);font-size:.85rem}.title-input{font-size:1.7rem;font-weight:700}.mode-tabs{grid-template-columns:repeat(auto-fit,minmax(110px,1fr));gap:10px;margin:8px 0 18px;display:grid}.mode-tab{background:var(--surface);min-height:52px;color:var(--text);border-radius:10px;justify-content:center;align-items:center;gap:10px;font-weight:700;text-decoration:none;display:flex}.mode-tab[aria-disabled=true]{opacity:.5;pointer-events:none}.deck{margin:0 0 24px}.deck-card{background:var(--surface);cursor:pointer;text-align:center;-webkit-user-select:none;user-select:none;border-radius:10px;flex-direction:column;justify-content:center;align-items:center;gap:10px;min-height:280px;padding:18px 18px 46px;display:flex;position:relative}.deck-card:focus-visible{outline:2px solid var(--link)}.deck-end{cursor:default;min-height:220px}.deck-top{cursor:default;justify-content:space-between;align-items:center;display:flex;position:absolute;top:8px;left:14px;right:8px}.deck-text{overflow-wrap:anywhere;white-space:pre-wrap;padding-top:14px;font-size:1.6rem}.deck-shortcut{background:#a8b1ff47;border-radius:0 0 10px 10px;padding:9px;font-size:.8rem;position:absolute;bottom:0;left:0;right:0}kbd{background:var(--bg);color:var(--text);font:inherit;border-radius:5px;padding:1px 7px;font-size:.78rem}.deck-controls{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:10px 14px;margin-top:12px;display:flex}.deck-nav{align-items:center;gap:14px;display:flex}.deck-count{text-align:center;min-width:64px;font-weight:600}.deck-tools{gap:6px;display:flex}.round-btn{border:2px solid var(--line);background:var(--field);width:52px;height:40px;color:var(--text);cursor:pointer;border-radius:999px;justify-content:center;align-items:center;display:inline-flex}.round-btn.no{color:var(--err);border-color:var(--err)}.round-btn.yes{color:var(--ok);border-color:var(--ok)}.round-btn:disabled{opacity:.4;cursor:default}.tool-btn{width:40px;height:40px;color:var(--muted);cursor:pointer;background:0 0;border:0;border-radius:50%;justify-content:center;align-items:center;text-decoration:none;display:inline-flex}.tool-btn[aria-pressed=true]{background:var(--surface-2);color:var(--link)}.tool-btn:disabled{opacity:.35;cursor:default}.switch{cursor:pointer;align-items:center;gap:10px;font-size:.9rem;font-weight:600;display:inline-flex}.switch input{opacity:0;width:1px;height:1px;position:absolute}.switch-ui{background:var(--surface-2);border-radius:999px;flex:none;width:36px;height:20px;transition:background .15s;position:relative}.switch-ui:after{content:"";background:#fff;border-radius:50%;width:14px;height:14px;transition:transform .15s;position:absolute;top:3px;left:3px}.switch input:checked+.switch-ui{background:var(--accent)}.switch input:checked+.switch-ui:after{transform:translate(16px)}.switch input:focus-visible+.switch-ui{outline:2px solid var(--link);outline-offset:2px}.switch input:disabled+.switch-ui{opacity:.4}.terms{margin-top:8px}.terms-head h2{font-size:1.15rem}.term-group{margin:18px 0}.group-name{margin:0 0 2px;font-size:1.05rem}.group-name.learning{color:#ff9f43}.group-name.new{color:var(--link)}.group-name.mastered{color:var(--ok)}.preview{border:0;flex-direction:column;gap:8px;margin:10px 0 0;padding:0;list-style:none;display:flex}.preview-row{background:var(--surface);border:0;border-radius:8px;padding:12px 14px}.preview-row+.preview-row{border:0}.term-cols{grid-template-columns:minmax(0,1fr) minmax(0,1.4fr) auto;align-items:start;gap:14px;display:grid}.term-col{overflow-wrap:anywhere;border-right:1px solid var(--line);padding-right:12px;font-weight:500}.def-col{overflow-wrap:anywhere;white-space:pre-wrap}@media (width<=560px){.term-cols{grid-template-columns:minmax(0,1fr) auto}.term-col{border-right:0;grid-column:1;padding-right:0}.def-col{color:var(--muted);grid-column:1}.term-cols .star-btn{grid-area:1/2}}.more{margin:14px 0}.more>summary{cursor:pointer;background:var(--surface);border-radius:8px;padding:12px 14px;font-weight:700}.more[open]>summary{margin-bottom:10px}.dialog{background:var(--field);border-radius:16px;max-width:640px;margin:8vh auto 0;padding:28px}.goal-grid{grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px;margin:18px 0 26px;display:grid}.goal-opt{text-align:left;border:2px solid var(--line);color:var(--text);font:inherit;cursor:pointer;background:0 0;border-radius:10px;flex-direction:column;gap:4px;padding:16px;display:flex}.goal-opt.on{border-color:var(--accent);background:#4255ff2e}.learn-top{justify-content:space-between;align-items:center;padding:4px 0 14px;display:flex}.learn-title{color:var(--text);align-items:center;gap:10px;font-weight:700;text-decoration:none;display:inline-flex}.learn-icon{color:var(--accent);flex:none}.seg-wrap{align-items:center;gap:8px;margin-bottom:18px;display:flex}.seg-end{background:var(--surface-2);border-radius:999px;flex:none;justify-content:center;align-items:center;min-width:38px;height:38px;padding:0 8px;font-size:.9rem;font-weight:700;display:inline-flex}.seg-end.ok{background:var(--ok);color:#fff}.seg-bars{flex:1;gap:6px;display:flex}.seg{background:var(--surface-2);border-radius:999px;flex:1;height:8px;overflow:hidden}.seg>div{background:var(--ok);height:100%;transition:width .25s}.learn-card{background:var(--surface);border-radius:10px;padding:22px}.learn-prompt{overflow-wrap:anywhere;white-space:pre-wrap;margin:14px 0 22px;font-size:1.35rem}.learn-hint{margin:0 0 10px;font-size:.9rem;font-weight:700}.choices{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;display:grid}@media (width<=560px){.choices{grid-template-columns:minmax(0,1fr)}}.choice{text-align:left;border:2px solid var(--line);min-height:76px;color:var(--text);font:inherit;cursor:pointer;overflow-wrap:anywhere;background:0 0;border-radius:10px;align-items:center;gap:14px;padding:12px 16px;display:flex}.choice-n{width:22px;color:var(--muted);flex:none;font-size:.85rem}.choice.right{border-color:var(--ok);background:var(--ok-bg)}.choice.wrong{border-color:var(--err);background:var(--err-bg)}.learn-foot{justify-content:flex-end;align-items:center;gap:12px;min-height:44px;margin-top:18px;display:flex}.link-btn{color:var(--link);font:inherit;cursor:pointer;background:0 0;border:0;padding:8px;font-weight:600}.danger-text{color:var(--err)}.flip-box{border:2px dashed var(--line);text-align:center;cursor:pointer;border-radius:10px;justify-content:center;align-items:center;min-height:120px;margin-bottom:12px;padding:16px;display:flex}.options-panel{background:var(--field);border:1px solid var(--line);border-radius:12px;margin:0 0 16px;padding:18px}.center-text{text-align:center;padding:28px 18px}.shell.focus .topbar{display:none}.deck-scene{perspective:1400px;cursor:pointer;border-radius:10px;height:clamp(260px,42vh,340px)}.deck-scene:focus-visible{outline:2px solid var(--link);outline-offset:2px}.deck-inner{width:100%;height:100%;transform-style:preserve-3d;transition:transform .55s cubic-bezier(.4,.2,.2,1);position:relative}.deck-face{background:var(--surface);text-align:center;-webkit-user-select:none;user-select:none;backface-visibility:hidden;border-radius:10px;flex-direction:column;justify-content:center;align-items:center;gap:10px;padding:18px 18px 46px;display:flex;position:absolute;inset:0;overflow:hidden}.deck-back{transform:rotateX(180deg)}.deck-face .deck-text{max-height:100%;overflow-y:auto}@media (prefers-reduced-motion:reduce){.deck-inner{transition:none}}.stat-row{gap:12px;margin-bottom:8px;display:flex}.stat{background:var(--field);border-radius:10px;flex-direction:column;flex:1;gap:2px;padding:14px;display:flex}.stat strong{font-size:1.8rem;line-height:1.1}.today-banner{border:1px solid var(--accent);color:var(--text);background:#4255ff33;border-radius:10px;justify-content:space-between;align-items:center;gap:12px;margin-bottom:18px;padding:14px 18px;text-decoration:none;display:flex}.today-go{color:var(--link);white-space:nowrap;font-weight:700}.rating-grid{grid-template-columns:repeat(4,minmax(0,1fr));gap:8px;margin-top:16px;display:grid}@media (width<=480px){.rating-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}.rate-btn{border:2px solid var(--line);color:var(--text);font:inherit;cursor:pointer;background:0 0;border-radius:10px;flex-direction:column;align-items:center;gap:2px;padding:12px 6px;display:flex;position:relative}.rate-btn .small{color:var(--muted)}.rate-btn.r1{border-color:var(--err)}.rate-btn.r3{border-color:var(--ok)}.rate-btn.r4{border-color:var(--link)}.rate-btn.r2{border-color:#ff9f43}.rate-btn.suggested{background:var(--surface-2);box-shadow:0 0 0 2px var(--text) inset}.rate-key{color:var(--muted);font-size:.7rem;position:absolute;top:4px;right:8px}.row-switch{justify-content:space-between;width:100%;padding:10px 0;display:flex}.switch input:checked~.switch-ui{background:var(--accent)}.switch input:checked~.switch-ui:after{transform:translate(16px)}.group{margin-bottom:0}.group+*,.group:last-of-type+.panel{margin-top:32px}.row+p{margin-top:10px}.page{padding-bottom:56px}.wrap-stats{flex-wrap:wrap}.wrap-stats .stat{flex:110px}.stack-bar{background:var(--border,#80808040);border-radius:7px;height:14px;display:flex;overflow:hidden}.sb-mastered{background:#2fbf71}.sb-learning{background:var(--accent)}.sb-new{background:#80808073}.legend{flex-wrap:wrap;gap:8px 20px;margin:12px 0 0;padding:0;list-style:none;display:flex}.legend i{border-radius:50%;width:10px;height:10px;margin-right:6px;display:inline-block}.bars{align-items:flex-end;gap:6px;height:140px;margin:8px 0;display:flex}.bar-col{flex-direction:column;flex:1;align-items:center;gap:4px;min-width:0;height:100%;display:flex}.bar-track{flex:1;align-items:flex-end;width:100%;display:flex}.bar-fill{background:var(--accent);border-radius:4px 4px 0 0;flex-direction:column;justify-content:flex-start;width:100%;min-height:0;display:flex;overflow:hidden}.bar-wrong{background:#0006;width:100%}.bar-label{color:var(--muted,#8a93a6);font-size:11px}.test-q.ok{border-color:#2fbf71}.test-q.bad{border-color:#e5645c}.test-shown{background:#80808026;border-radius:10px;margin:4px 0 12px;padding:10px 12px;font-size:18px}.choices{gap:8px;display:grid}.opt{border:2px solid var(--border,#8080804d);cursor:pointer;border-radius:10px;align-items:center;gap:10px;padding:10px 14px;display:flex}.opt.on{border-color:var(--accent)}.fb-ok{color:#2fbf71;margin:8px 0 0}.fb-bad{color:#e5645c;margin:8px 0 0}.settings-tabs{grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:12px;margin:8px 0 22px;display:grid}.settings-tab{text-align:left;border:1px solid var(--border,#8080804d);background:var(--surface);color:var(--text);cursor:pointer;font:inherit;border-radius:14px;align-items:center;gap:14px;padding:14px 16px;display:flex}.settings-tab.on{border-color:var(--accent);box-shadow:0 0 0 1px var(--accent) inset;background:#4255ff29}.settings-tab svg{color:var(--link);flex:none}.st-text{flex-direction:column;gap:2px;min-width:0;display:flex}.settings-h{margin-top:0}.today-banner{border:1px solid var(--accent);color:var(--text);background:linear-gradient(120deg,#4255ff61,#7846ff38);border-radius:16px;align-items:center;gap:16px;margin-bottom:22px;padding:18px 20px;text-decoration:none;transition:transform .15s,box-shadow .15s;display:flex}.today-icon{background:var(--accent);color:#fff;border-radius:14px;flex:none;place-items:center;width:48px;height:48px;display:grid}.today-text{flex-direction:column;flex:1;gap:8px;min-width:0;font-size:17px;display:flex}.today-chips{flex-wrap:wrap;gap:8px;display:flex}.chip{background:#ffffff1f;border-radius:999px;padding:3px 12px;font-size:14px}.chip b{font-size:16px}.today-go{background:var(--accent);color:#fff;white-space:nowrap;border-radius:999px;flex:none;padding:10px 18px;font-weight:700}@media (width<=520px){.today-banner{flex-wrap:wrap}.today-go{text-align:center;width:100%}}.cover{aspect-ratio:1;object-fit:cover;border-radius:10px;flex:none;width:56px;height:56px;display:block}.cover-ph{color:#fff;background:hsl(var(--h,230) 55% 48%);place-items:center;font-size:1.4rem;font-weight:800;display:grid}.cover-lg{border-radius:14px;width:112px;height:112px;font-size:2.6rem}.cover-md{border-radius:12px;width:72px;height:72px;font-size:1.8rem}.cover-fill{border-radius:14px;width:100%;height:auto;font-size:3rem}.set-item.with-cover{flex-direction:row;align-items:center;gap:16px}.set-text{flex-direction:column-reverse;gap:4px;min-width:0;display:flex}.cover-picker{flex-wrap:wrap;align-items:center;gap:18px;margin:8px 0 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