:root{color-scheme:light;--bg: #f6f7f2;--panel: #ffffff;--ink: #1d2420;--muted: #687069;--line: #dfe3dc;--accent: #2f6f5e;--accent-strong: #1f4f43;--blue: #315f9f;--gold: #b0782c;--danger: #a64545;--shadow: 0 18px 45px rgba(29, 36, 32, .1)}*{box-sizing:border-box}body{margin:0;min-height:100vh;background:var(--bg);color:var(--ink);font-family:ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}button,a{font:inherit}button{cursor:pointer}.shell{display:grid;grid-template-columns:340px minmax(0,1fr);min-height:100dvh}.sidebar{display:flex;flex-direction:column;gap:22px;padding:32px 24px;border-right:1px solid var(--line);background:#fbfcf8}.eyebrow,.meta,.label{margin:0;color:var(--muted);font-size:12px;font-weight:700;letter-spacing:0;text-transform:uppercase}h1,h2{margin:0;letter-spacing:0}h1{margin-top:6px;font-size:34px}.appNav{display:grid;grid-template-columns:44px;gap:8px}.questionWorkspace{display:grid;grid-template-columns:minmax(220px,280px) minmax(0,1fr);gap:20px;align-items:start}.questionSetList{display:grid;gap:8px;max-height:calc(100vh - 170px);overflow:auto}.questionSetList .sectionRow{width:100%;text-align:left}.questionPreview{min-width:0;padding:24px;border:1px solid var(--line);border-radius:8px;background:var(--panel)}.questionSetSelect{display:none}.questionPreview h2{margin-top:4px;font-size:20px}.questionPreview pre{margin:22px 0;white-space:pre-wrap;color:var(--ink);font-family:inherit;font-size:15px;line-height:1.8}.questionPager{display:grid;grid-template-columns:repeat(8,1fr);gap:6px;margin-top:20px}.questionPager button{height:34px;border:1px solid var(--line);border-radius:6px;background:var(--panel);color:var(--ink)}.questionPager button.active{border-color:var(--accent);background:#e5f0eb;color:var(--accent-strong);font-weight:800}.appNav a,.appNav button{display:grid;place-items:center;height:38px;border:1px solid var(--line);border-radius:8px;background:var(--panel);color:var(--ink);text-decoration:none}.appNav a{font-size:20px}.settingsPage{max-width:760px}.settingsGroup{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:16px 24px;align-items:center;padding:20px 0;border-top:1px solid var(--line)}.settingsGroup h2{font-size:17px}.settingsGroup p{margin:6px 0 0;color:var(--muted);font-size:14px;line-height:1.5}.settingsGroup output{color:var(--accent-strong);font-weight:800}.settingsGroup>input[type=range]{grid-column:1 / -1;width:100%;accent-color:var(--accent)}.chapterSettings{display:block}.settingHeader{display:grid;gap:12px;justify-items:start}.chapterChoices{display:grid;gap:4px;margin-top:18px}.chapterBook{min-width:0;margin:0;padding:14px 0 0;border:0;border-top:1px solid var(--line)}.chapterBook legend{padding:0;color:var(--muted);font-size:12px;font-weight:800}.chapterSectionGroup{padding:12px 0 2px}.chapterToggle{display:flex;align-items:center;gap:9px;color:var(--ink);font-size:14px;font-weight:800}.chapterToggle input,.allSectionsToggle input{width:17px;height:17px;margin:0;accent-color:var(--accent)}.allSectionsToggle{display:flex;align-items:center;gap:9px;color:var(--ink);font-size:14px;font-weight:800}.chapterChoice{display:flex;align-items:center;gap:10px;min-height:42px;color:var(--ink);font-size:15px}.sectionSettingRow{display:grid;grid-template-columns:minmax(0,1fr) auto;column-gap:10px;align-items:center}.sectionGenerateButton{min-width:62px;height:34px;border:1px solid var(--line);border-radius:6px;background:var(--panel);color:var(--ink);font:inherit;font-size:13px;font-weight:800}.sectionGenerateButton:disabled{color:var(--muted)}.chapterChoice input{width:17px;height:17px;margin:0;accent-color:var(--accent)}.chapterChoice>span{flex:1 1 auto;min-width:0}.settingsGroup .sectionCardCount{flex:0 0 auto;color:var(--muted);font-size:13px;font-weight:700}.generationStatus{grid-column:1 / -1;margin:-2px 0 6px 27px;color:var(--muted);font-size:13px}.settingsLogout{padding-top:20px;border-top:1px solid var(--line)}.settingsActions{display:flex;justify-content:flex-end;gap:10px;padding:20px 0;border-top:1px solid var(--line)}.appNav a.active{border-color:var(--accent);background:#e5f0eb;color:var(--accent-strong);font-weight:800}.loginShell{display:grid;place-items:center;min-height:100vh;padding:24px}.loginPanel{display:grid;gap:18px;width:min(420px,100%);border:1px solid var(--line);border-radius:8px;padding:30px;background:var(--panel);box-shadow:var(--shadow)}.loginPanel h1{margin:0}.loginPanel label{display:grid;gap:8px;color:var(--muted);font-size:13px;font-weight:800}.loginPanel input{height:44px;border:1px solid var(--line);border-radius:8px;padding:0 12px;color:var(--ink);font:inherit}.loginError{margin:0;color:var(--danger);font-size:14px;font-weight:750}.inlineError{margin:0 0 10px;color:var(--danger);font-size:13px;font-weight:750}.summary{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}.summary div,.miniCard{padding:14px 10px;border:1px solid var(--line);border-radius:8px;background:var(--panel)}.summary span{display:block;font-size:24px;font-weight:800}.summary small{color:var(--muted);font-size:12px}.grades button,.primary,.secondary,.iconButton{border:1px solid var(--line);border-radius:8px;background:var(--panel);color:var(--ink)}.workspace{display:grid;grid-template-rows:auto minmax(320px,auto) 1fr;gap:24px;padding:36px}.topbar{display:flex;align-items:flex-start;justify-content:space-between;gap:20px}.topbar h2{margin-top:6px;font-size:26px}.iconButton{width:42px;height:42px;font-size:20px}.reviewCard,.sourcePanel{border:1px solid var(--line);border-radius:8px;background:var(--panel);box-shadow:var(--shadow)}.reviewCard{display:flex;flex-direction:column;gap:26px;justify-content:space-between;min-height:360px;padding:34px}.emptyReviewCard{align-items:flex-start;justify-content:center}.emptyReviewCard h2{margin-top:8px;font-size:22px}.emptyReviewCard p:not(.label){margin:10px 0 0;color:var(--muted);line-height:1.6}.emptyReviewAction{display:grid;place-items:center;text-decoration:none}.question,.answer{margin:10px 0 0;font-size:26px;font-weight:750;line-height:1.45}.answer{color:var(--accent-strong)}.actions{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.primary{min-width:132px;height:44px;border-color:var(--accent);background:var(--accent);color:#fff;font-weight:800}.secondary{min-width:104px;height:44px;background:var(--panel);font-weight:800}.secondary.danger{border-color:#dfc9c9;color:var(--danger)}.typedAnswer{display:grid;gap:10px}.answerRow{display:flex;gap:10px}.answerRow input{width:min(520px,100%);height:44px;border:1px solid var(--line);border-radius:8px;padding:0 14px;background:#fbfcf8;color:var(--ink);font:inherit}.answerRow input:disabled{color:var(--muted)}.choiceList{display:grid;gap:10px}.choiceButton{display:grid;grid-template-columns:30px minmax(0,1fr);align-items:center;gap:12px;min-height:50px;border:1px solid var(--line);border-radius:8px;padding:10px 14px;background:#fbfcf8;color:var(--ink);text-align:left}.choiceButton span{display:grid;place-items:center;width:30px;height:30px;border-radius:999px;background:#edf0e8;color:var(--muted);font-size:13px;font-weight:800}.choiceButton.selected{border-color:var(--blue)}.choiceButton.correct{border-color:var(--accent);background:#edf7f2}.choiceButton.incorrect{border-color:var(--danger);background:#fff4f4}.resultPanel{border:1px solid var(--line);border-radius:8px;padding:12px 14px;background:#fbfcf8}.resultPanel.correct{border-color:#b9d7c9;background:#edf7f2}.resultPanel.incorrect{border-color:#dfc9c9;background:#fff4f4}.resultDetail{margin:6px 0 0;color:#526058;line-height:1.55}.grades{display:grid;grid-template-columns:repeat(4,minmax(78px,1fr));gap:8px;width:min(520px,100%)}.grades button{height:44px;font-weight:800}.grades button[data-grade=again]{color:var(--danger)}.grades button[data-grade=hard]{color:var(--gold)}.grades button[data-grade=good]{color:var(--blue)}.grades button[data-grade=easy]{color:var(--accent-strong)}.sourcePanel{padding:24px;box-shadow:none}.sourceHeader{display:flex;justify-content:space-between;gap:16px;margin-bottom:12px}.sourceHeader h2{font-size:16px}.sourceHeader span{color:var(--muted);font-size:13px}.sourcePanel p{margin:0;color:#37413b;font-size:15px;line-height:1.7;white-space:pre-line}.plainPage{min-height:100vh;padding:32px}.plainPage .appNav{max-width:340px;margin-bottom:28px}.pageHeader{display:flex;align-items:flex-end;justify-content:space-between;gap:18px}.pageHeader>p{margin:0;color:var(--muted);font-size:14px;font-weight:750}.toolbar{display:flex;flex-wrap:wrap;gap:10px;margin-top:22px}.toolbar label{display:grid;gap:6px;color:var(--muted);font-size:12px;font-weight:800;text-transform:uppercase}.toolbar select{min-width:190px;height:40px;border:1px solid var(--line);border-radius:8px;padding:0 34px 0 12px;background:var(--panel);color:var(--ink);font:inherit}.cardGrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:12px;margin-top:22px}.bookList{display:grid;gap:18px;margin-top:22px}.bookWorkspace{display:grid;grid-template-columns:minmax(0,1fr) 420px;gap:18px;align-items:start;margin-top:22px}.bookWorkspace .bookList{margin-top:0}.bookPanel{border:1px solid var(--line);border-radius:8px;background:var(--panel)}.bookHeader{display:flex;justify-content:space-between;gap:18px;padding:20px;border-bottom:1px solid var(--line)}.bookHeader h2{margin-top:8px;font-size:24px}.bookHeader>span{align-self:flex-start;border:1px solid #b9d7c9;border-radius:999px;padding:6px 10px;background:#edf7f2;color:var(--accent-strong);font-size:13px;font-weight:800;white-space:nowrap}.chapterList{display:grid;gap:0}.chapterPanel{padding:16px 20px;border-bottom:1px solid var(--line)}.chapterPanel:last-child{border-bottom:0}.chapterPanel h3{display:flex;align-items:baseline;justify-content:space-between;gap:12px;margin:0 0 12px;font-size:16px}.chapterPanel h3 span{color:var(--muted);font-size:12px;font-weight:700;white-space:nowrap}.sectionList{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:8px}.sectionRow{display:grid;gap:4px;min-height:58px;border:1px solid var(--line);border-radius:8px;padding:10px;background:#fbfcf8;color:var(--ink);text-align:left}.sectionRow.selected{border-color:var(--accent);background:#edf7f2}.sectionRow span{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:14px;font-weight:750}.sectionRow small{color:var(--muted);font-size:12px}.sourcePreview{position:sticky;top:18px;max-height:calc(100vh - 36px);overflow:auto;border:1px solid var(--line);border-radius:8px;padding:20px;background:var(--panel)}.sourcePreview h3{margin:8px 0 14px;font-size:18px;line-height:1.35}.sourcePreview>p:last-child{margin:0;color:#37413b;font-size:14px;line-height:1.7;white-space:pre-line}.previewStatus{margin:0;color:var(--muted);line-height:1.5}.miniCard{padding:18px}.miniCard.excluded{opacity:.68;background:#faf5f5}.miniCard h2{margin-top:8px;font-size:17px;line-height:1.4}.miniCard p:last-child{color:#39433d;line-height:1.55}.tagRow{display:flex;flex-wrap:wrap;gap:6px;margin-top:14px}.tagRow span{border:1px solid var(--line);border-radius:999px;padding:4px 8px;background:#fbfcf8;color:var(--muted);font-size:12px;font-weight:700}.miniActions{display:flex;justify-content:flex-end;margin-top:16px}.miniActions button{height:34px;border:1px solid var(--line);border-radius:8px;padding:0 12px;background:var(--panel);color:var(--ink);font-weight:800}@media(max-width:860px){.shell{grid-template-columns:1fr}.sidebar{gap:0;padding:10px 16px;border-right:0;border-bottom:1px solid var(--line)}.workspace{min-height:calc(100dvh - 61px);grid-template-rows:auto minmax(0,1fr);gap:16px;padding:16px 16px calc(88px + env(safe-area-inset-bottom))}.topbar{padding:0 4px}.topbar h2{margin-top:2px;font-size:19px}.topbar .meta{font-size:11px}.reviewCard{min-height:0;padding:20px;box-shadow:none}.answerDock{position:fixed;z-index:10;right:0;bottom:0;left:0;display:flex;gap:10px;padding:10px 16px calc(10px + env(safe-area-inset-bottom));border-top:1px solid var(--line);background:#f6f7f2f5;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.answerDock button{flex:1 1 0;min-width:0}.question,.answer{font-size:21px}.grades{grid-template-columns:repeat(2,minmax(0,1fr))}.bookWorkspace{grid-template-columns:1fr}.questionWorkspace{grid-template-columns:1fr;gap:0}.questionSetList{display:none}.questionPreview{padding:0;border:0;background:transparent}.questionSetSelect{display:grid;gap:6px;margin-bottom:18px;color:var(--muted);font-size:12px;font-weight:800}.questionSetSelect select{width:100%;height:42px;border:1px solid var(--line);border-radius:8px;padding:0 10px;background:var(--panel);color:var(--ink);font:inherit}.questionPreview .sourceHeader{align-items:flex-start}.questionPreview .sourceHeader span{padding-top:2px;white-space:nowrap}.questionPager{display:flex;overflow-x:auto;padding-bottom:4px}.questionPager button{min-width:40px;flex:0 0 40px}.questionPreview pre{margin:18px 0;font-size:16px;line-height:1.82}.sourcePreview{position:static;max-height:none}}@media(max-width:560px){.answerRow{flex-wrap:wrap}.answerRow input{width:100%}.answerRow button{flex:1 1 0;min-width:0}}