:root{--bg:#fff;--surface:#f3f3f1;--elevated:#e9e9e6;--sunken:#fafaf9;--hairline:rgba(0,0,0,.09);--ink:#111;--ink2:#55554f;--ink3:#8b8b84;--accent:#111;--on-accent:#fff;--correct:#1f7a4d;--correct-soft:rgba(31,122,77,.1);--wrong:#b3372b;--wrong-soft:rgba(179,55,43,.09);--radius:20px;--radius-sm:12px;--serif:"New York",ui-serif,"Iowan Old Style","Palatino Linotype",Georgia,"Noto Serif",serif;--sans:-apple-system,BlinkMacSystemFont,"SF Pro Text","Segoe UI",Roboto,"Helvetica Neue","Noto Sans",Arial,sans-serif;--mono:ui-monospace,"SF Mono",Menlo,Consolas,monospace;--ease:cubic-bezier(0.2,0.8,0.2,1);--spring:cubic-bezier(0.34,1.4,0.64,1);color-scheme:light}@media 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.2s}.kind-tile:hover{transform:translateY(-2px)}.kind-tile.on{background:var(--accent);color:var(--on-accent)}.kind-icon{width:36px;height:36px;border-radius:10px;background:var(--elevated);display:grid;place-items:center;flex:none}.kind-tile.on .kind-icon{background:color-mix(in srgb,var(--on-accent) 16%,transparent)}.create-panel{margin-top:12px;background:var(--surface);border-radius:16px;padding:18px;display:grid;grid-gap:14px;gap:14px;animation:rise .3s var(--ease)}.create-panel p{margin:0}.field{display:grid;grid-gap:8px;gap:8px}.field-label{font-size:14px;font-weight:600;color:var(--ink2)}.chips-row{display:flex;flex-wrap:wrap;gap:8px}.pill{border:0;background:var(--bg);border-radius:10px;padding:8px 14px;min-height:40px;min-width:48px;cursor:pointer;display:inline-flex;gap:6px;align-items:center;justify-content:center;font-feature-settings:"tnum";font-variant-numeric:tabular-nums;box-shadow:0 0 0 1px var(--hairline);transition:background .2s,transform .2s var(--spring)}.pill.on{background:var(--accent);color:var(--on-accent);box-shadow:none;font-weight:600}.pill.locked{color:var(--ink3)}.pill:active{transform:scale(.95)}.btn.wide{width:100%}.output-list{list-style:none;padding:0;margin:0;display:grid;grid-gap:8px;gap:8px}.output-row{display:flex;align-items:center;gap:12px;background:var(--surface);border-radius:14px;padding:12px 14px;animation:rise .35s var(--ease) both}.output-row.failed .kind-icon{background:var(--wrong-soft);color:var(--wrong)}.output-text{flex:1 1;display:flex;flex-direction:column;min-width:0}.output-title{font-weight:600}.spinner{width:18px;height:18px;border-radius:50%;border:2px solid var(--hairline);border-top:2px solid;animation:spin .8s linear infinite;flex:none;display:inline-block}.spinner.big{width:30px;height:30px;border-width:3px;margin-bottom:6px}@keyframes spin{to{transform:rotate(1turn)}}.back-link{display:inline-flex;align-items:center;gap:6px;background:none;border:0;padding:6px 0;margin-bottom:10px;color:var(--ink2);cursor:pointer;font-size:15px;min-height:40px}.only-narrow{display:none}.viewer{animation:rise .3s var(--ease)}.viewer-title{margin-bottom:14px!important}.viewer-actions{display:flex;gap:8px;justify-content:flex-end;margin-bottom:12px;flex-wrap:wrap}.reader{max-width:720px;font-family:var(--serif);font-size:18px;line-height:1.65}.reader-title{font-family:var(--serif)!important;font-size:30px!important;margin-bottom:10px!important}.reader-section{padding:18px 0 8px;border-top:1px solid var(--hairline);animation:rise .45s var(--ease) both}.reader-section:first-of-type{border-top:0}.reader-label{font-family:var(--sans);font-size:12px;font-weight:600;text-transform:uppercase;letter-spacing:.08em;color:var(--ink3)}.reader h3{font-family:var(--serif);font-size:24px;margin:4px 0 8px}.reader h4{font-family:var(--sans);font-size:17px;margin:18px 0 4px}.reader-overview{color:var(--ink2);font-style:italic}.reader li,.reader p{margin:0 0 12px}.key-terms{background:var(--surface);border-radius:14px;padding:14px 18px;margin:14px 0;font-family:var(--sans);font-size:15px}.key-terms-title{font-weight:700;font-size:13px;text-transform:uppercase;letter-spacing:.06em;color:var(--ink3);margin-bottom:8px}.key-terms dl{margin:0;display:grid;grid-gap:8px;gap:8px}.key-terms dt{font-weight:600}.key-terms dd{margin:0;color:var(--ink2)}.cards-view{max-width:620px;margin:0 auto}.flashcard{display:block;width:100%;height:320px;perspective:1200px;background:none;border:0;padding:0;cursor:pointer;margin:6px 0 14px}.flashcard-inner{position:relative;display:block;width:100%;height:100%;transform-style:preserve-3d;transition:transform .6s var(--spring)}.flashcard.flipped .flashcard-inner{transform:rotateY(180deg)}.flashcard .face{position:absolute;inset:0;display:grid;place-items:center;padding:28px;border-radius:22px;background:var(--surface);backface-visibility:hidden;-webkit-backface-visibility:hidden;font-size:20px;line-height:1.45;text-align:center;overflow:auto;box-shadow:0 0 0 1px var(--hairline)}.flashcard .face.back{transform:rotateY(180deg);font-family:var(--serif);background:var(--bg)}.pager{display:flex;align-items:center;justify-content:center;gap:18px;margin-top:10px}.pager-count{font-feature-settings:"tnum";font-variant-numeric:tabular-nums;color:var(--ink2);min-width:90px;text-align:center}.open-q,.quiz{max-width:640px;animation:rise .3s var(--ease)}.quiz-progress{font-size:14px;color:var(--ink3);margin-bottom:6px;font-feature-settings:"tnum";font-variant-numeric:tabular-nums}.quiz-q{font-size:21px;line-height:1.35;margin:0 0 16px}.options{display:grid;grid-gap:10px;gap:10px}.option{display:flex;justify-content:space-between;align-items:center;gap:12px;text-align:start;background:var(--surface);border:0;border-radius:14px;padding:14px 16px;min-height:52px;cursor:pointer;font-size:16px;box-shadow:0 0 0 1px transparent;transition:background .25s,box-shadow .25s,opacity .25s,transform .25s var(--spring)}.option:hover:not([disabled]){transform:translateX(3px)}.option.correct{background:var(--correct-soft);box-shadow:0 0 0 1.5px var(--correct);color:var(--ink)}.option.correct svg{color:var(--correct)}.option.wrong{background:var(--wrong-soft);box-shadow:0 0 0 1.5px var(--wrong);animation:shake .4s}.option.wrong svg{color:var(--wrong)}.option.dim{opacity:.55}.option[disabled]{cursor:default;color:inherit}@keyframes shake{25%{transform:translateX(-4px)}75%{transform:translateX(4px)}}.explanation{color:var(--ink2);margin:16px 0 0;animation:rise .3s var(--ease)}.quiz-nav{margin-top:18px;min-height:44px}.quiz-result{text-align:center;padding:40px 0;animation:rise .4s var(--ease)}.big-score{font-family:var(--serif);font-size:40px;margin-bottom:18px;font-feature-settings:"tnum";font-variant-numeric:tabular-nums}.score-bar{height:8px;border-radius:4px;background:var(--surface);max-width:360px;margin:0 auto 26px;overflow:hidden}.score-bar span{display:block;height:100%;background:var(--correct);animation:grow 1.2s var(--ease) both;transform-origin:left}.sample{background:var(--surface);border-radius:14px;padding:14px 18px;margin-top:12px;animation:rise .3s var(--ease)}.sample p{margin:6px 0 0;font-family:var(--serif)}.open-q .textarea{margin:8px 0 12px}.modal-backdrop{position:fixed;inset:0;background:rgba(0,0,0,.42);display:grid;place-items:center;z-index:100;padding:20px;animation:fade .2s}@keyframes fade{0%{opacity:0}}.modal{background:var(--bg);border-radius:22px;padding:28px;max-width:420px;width:100%;animation:pop .35s var(--spring)}@keyframes pop{0%{opacity:0;transform:scale(.94) translateY(10px)}}.modal h3{font-size:21px}.modal p{color:var(--ink2);margin:0 0 20px}.modal-icon{width:48px;height:48px;border-radius:14px;background:var(--surface);display:grid;place-items:center;margin-bottom:14px}.modal-actions{display:flex;gap:10px;flex-wrap:wrap}@media (max-width:860px){.tool{grid-template-columns:1fr}.tool-side{position:static}.tool-side.has-selection .source-list{display:none}.only-narrow{display:inline-flex}.tool-main{padding:18px}}@media (max-width:480px){.kind-grid{grid-template-columns:1fr 1fr}.flashcard{height:280px}}.tool.compact{grid-template-columns:1fr;gap:12px}.tool.compact .tool-side{position:static;padding:14px}.tool.compact .tool-side.has-selection .source-list{display:none}.tool.compact .only-narrow{display:inline-flex}.tool.compact .tool-main{padding:16px;box-shadow:none;background:transparent;min-height:0}.tool.compact .kind-grid{grid-template-columns:1fr 1fr}.tool.compact .flashcard{height:260px}