:root{color-scheme:light;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;--bg: #eef2f5;--surface: #ffffff;--surface-soft: #f3f6f8;--surface-muted: #e7edf2;--surface-active: #edf7f2;--border: #d7dee5;--border-strong: #c8d1da;--text: #18202a;--text-soft: #344250;--muted: #657383;--accent: #245b49;--ok: #236b42;--ok-bg: #e3f3e9;--bad: #a12f2f;--bad-bg: #f7e5e5;--shadow: 0 10px 28px rgba(24, 32, 42, .06);color:var(--text);background:var(--bg)}:root[data-theme=dark]{color-scheme:dark;--bg: #111820;--surface: #18222c;--surface-soft: #202d38;--surface-muted: #263542;--surface-active: #1e332d;--border: #334351;--border-strong: #445664;--text: #edf3f7;--text-soft: #d6e0e7;--muted: #9caab5;--accent: #62b891;--ok: #86d09f;--ok-bg: #20362a;--bad: #f08c8c;--bad-bg: #3a2428;--shadow: 0 10px 28px rgba(0, 0, 0, .26)}*{box-sizing:border-box}body{margin:0;background:var(--bg)}button,input,select{font:inherit}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.55}.login-shell{min-height:100vh;display:grid;place-items:center;background:var(--bg)}.login-panel,.panel{background:var(--surface);border:1px solid var(--border);border-radius:8px;box-shadow:var(--shadow)}.login-panel{width:min(420px,calc(100vw - 32px));padding:28px;display:grid;gap:18px}.login-panel h1,.app-header h1,.import-panel h2,.user-form h2,.user-list h2,.topic-stats h2{margin:0}label{display:grid;gap:6px;font-size:13px;font-weight:650;color:var(--text-soft)}input,select{min-height:40px;border:1px solid var(--border-strong);border-radius:6px;padding:8px 10px;background:var(--surface);color:var(--text)}.primary,.icon-text,.icon-only,.upload-button{min-height:40px;border:0;border-radius:6px;padding:9px 14px;display:inline-flex;gap:8px;align-items:center;justify-content:center;font-weight:700}.primary{color:#fff;background:var(--accent)}.icon-text,.icon-only,.upload-button{color:var(--text-soft);background:var(--surface-muted);border:1px solid var(--border)}.icon-only{width:40px;padding:9px}.icon-text.compact{width:100%;min-height:34px;padding:7px 10px}.icon-text.danger{color:var(--bad);background:var(--bad-bg)}.error,.bad{color:var(--bad)}.ok{color:var(--ok)}.app-header{height:72px;padding:14px 24px;background:var(--surface);border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;position:sticky;top:0;z-index:5}.app-header p{margin:4px 0 0;color:var(--muted);font-size:13px}.header-actions{display:flex;align-items:center;gap:10px}.app-frame{max-width:1520px;margin:0 auto;padding:22px;display:grid;grid-template-columns:220px minmax(0,1fr);gap:16px;align-items:start}.sidebar{position:sticky;top:94px;background:var(--surface);border:1px solid var(--border);border-radius:8px;padding:10px;display:grid;gap:8px;box-shadow:var(--shadow)}.sidebar button{min-height:42px;border:0;border-radius:6px;background:transparent;color:var(--text-soft);display:flex;align-items:center;gap:10px;padding:8px 10px;font-weight:800;text-align:left}.sidebar button.active,.sidebar button:hover{background:var(--surface-active);color:var(--accent)}.app-shell{max-width:1440px;min-width:0;display:grid;gap:16px}.panel{padding:16px}.picker,.controls,.import-panel{display:flex;gap:14px;align-items:end;flex-wrap:wrap}.picker label{min-width:280px}.exam-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:14px}.exam-card{min-height:118px;border:1px solid var(--border);border-radius:8px;background:var(--surface);padding:16px;display:grid;gap:6px;text-align:left;box-shadow:var(--shadow)}.exam-card:hover,.exam-card.active{border-color:var(--accent);background:var(--surface-active)}.exam-card strong{font-size:18px;color:var(--text)}.exam-card span,.exam-card small{color:var(--muted)}.empty-state{min-height:260px;display:grid;place-items:center;text-align:center;color:var(--muted)}.import-panel{justify-content:space-between}.import-panel p{margin:4px 0 0;color:var(--muted)}.import-preview{width:100%;display:grid;gap:12px}.import-preview h3{margin:0;font-size:16px}.preview-summary{display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:8px}.preview-summary span{border:1px solid var(--border);border-radius:6px;padding:10px;background:var(--surface-soft);color:var(--text-soft)}.preview-summary strong{display:block;color:var(--text);font-size:20px}.upload-button input{display:none}.import-log{width:100%;display:grid;gap:8px}.import-log div{border:1px solid var(--border);border-radius:6px;padding:10px;display:grid;gap:4px;background:var(--surface-soft)}.users-layout{display:grid;grid-template-columns:minmax(280px,360px) minmax(0,1fr);gap:16px;align-items:start}.user-form{display:grid;gap:14px}.user-form h2,.user-list h2{display:flex;gap:8px;align-items:center;font-size:18px}.user-form p{margin:4px 0 0;color:var(--muted)}.user-list{display:grid;gap:14px;min-width:0;overflow:hidden}.user-list-head{display:flex;align-items:center;justify-content:space-between;gap:12px}.user-rows{display:grid;gap:10px}.user-row{border:1px solid var(--border);border-radius:8px;padding:12px;display:grid;grid-template-columns:1fr;gap:12px;align-items:stretch;background:var(--surface-soft)}.user-row>input,.user-row>select,.user-row>button{width:100%}.user-row small{display:block;margin-top:4px;color:var(--muted)}.password-reset{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:8px}.controls label{min-width:190px}.session-status{display:flex;align-items:center;justify-content:space-between;gap:12px;color:var(--text-soft)}.session-status span{font-weight:750}.session-status small{color:var(--muted)}.stats{display:grid;grid-template-columns:repeat(6,minmax(120px,1fr));gap:12px}.stats div{background:var(--surface-soft);border-radius:6px;padding:14px}.stats strong{display:block;font-size:24px}.stats span{color:var(--muted);font-size:13px}.workspace{display:grid;grid-template-columns:360px minmax(0,1fr);gap:16px;align-items:start}.question-list{position:sticky;top:88px;max-height:min(620px,calc(100vh - 140px));display:flex;flex-direction:column;gap:12px;overflow:hidden}.list-summary{display:flex;align-items:baseline;gap:8px;padding:10px;background:var(--surface-soft);border-radius:6px}.list-summary strong{font-size:22px}.list-summary span{color:var(--muted);font-size:13px}.mode-hint{margin:0;border:1px solid var(--border);border-radius:6px;padding:10px;background:var(--surface-soft);color:var(--text-soft);font-size:13px;line-height:1.35}.toolbar{display:grid;grid-template-columns:1fr 1fr;gap:10px}.search{position:relative}.search svg{position:absolute;left:10px;bottom:12px;color:var(--muted)}.search input{padding-left:34px}.question-scroll{flex:1 1 auto;overflow:auto;display:grid;gap:8px;padding-right:2px;min-height:180px;scrollbar-gutter:stable}.question-row{width:100%;min-height:54px;border:1px solid var(--border);background:var(--surface);border-radius:6px;padding:8px 10px;display:grid;grid-template-columns:64px 1fr 20px;gap:8px;align-items:center;text-align:left}.question-row em{min-width:18px;min-height:18px;display:inline-flex;align-items:center;justify-content:center;font-style:normal}.question-row.active{border-color:var(--accent);background:var(--surface-active)}.question-row.correct{border-left:4px solid var(--ok)}.question-row.failed{border-left:4px solid var(--bad)}.question-row small{color:var(--muted);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.question-card{position:relative;min-height:520px;display:grid;gap:18px}.answer-modal{position:fixed;top:0;right:0;bottom:0;left:0;z-index:20;display:grid;place-items:center;background:#00000038;pointer-events:none}.answer-modal div{min-width:min(320px,calc(100vw - 40px));border:1px solid var(--border);border-radius:8px;padding:22px;display:grid;gap:6px;text-align:center;background:var(--surface);box-shadow:var(--shadow)}.answer-modal strong{font-size:24px}.answer-modal span{color:var(--text-soft);font-weight:750}.question-meta{display:flex;gap:8px;flex-wrap:wrap}.question-meta span{background:var(--surface-muted);border-radius:999px;padding:5px 9px;font-size:12px;font-weight:700;color:var(--text-soft)}.question-meta .correct{background:var(--ok-bg);color:var(--ok)}.question-meta .failed{background:var(--bad-bg);color:var(--bad)}.mark-button{min-height:28px;border:1px solid var(--border);border-radius:999px;padding:5px 9px;display:inline-flex;align-items:center;gap:5px;background:var(--surface-soft);color:var(--text-soft);font-size:12px;font-weight:750}.mark-button.active{border-color:var(--accent);background:var(--surface-active);color:var(--accent)}.mark-button:hover{background:var(--surface-active)}.question-text{white-space:pre-wrap;line-height:1.55;font-size:17px;overflow-wrap:anywhere}.image-strip{display:grid;gap:12px}.image-strip img{max-width:100%;border:1px solid var(--border);border-radius:6px}.image-fallback{border:1px dashed var(--border-strong);border-radius:6px;padding:12px;display:grid;gap:6px;background:var(--surface-soft)}.image-fallback strong{color:var(--bad)}.image-fallback a{color:var(--accent);overflow-wrap:anywhere}.choices{display:grid;gap:10px}.choice{grid-template-columns:24px 34px 1fr;align-items:start;padding:12px;border:1px solid var(--border);border-radius:6px;background:var(--surface-soft);color:var(--text)}.choice input{min-height:18px}.choice span{white-space:pre-wrap;line-height:1.45;overflow-wrap:anywhere}.manual-check{border:1px solid var(--border);border-radius:6px;padding:14px;display:grid;gap:10px}.manual-check label{display:flex;align-items:center;gap:8px}.manual-check input{min-height:18px}.answer-actions{display:flex;align-items:center;gap:14px;flex-wrap:wrap}.inline-toggle{display:inline-flex;grid-template-columns:none;align-items:center;gap:8px;min-height:40px;color:var(--text-soft)}.inline-toggle input{min-height:18px}.control-toggle{border:1px solid var(--border);border-radius:6px;padding:8px 10px;background:var(--surface-soft);font-size:13px;font-weight:750}.result{font-weight:800}.explanation{border-top:1px solid var(--border);padding-top:14px;color:var(--text-soft)}.question-history{border-top:1px solid var(--border);padding-top:14px;display:grid;gap:10px}.question-history h3{margin:0;font-size:16px}.history-list{display:grid;gap:8px}.history-list div{border:1px solid var(--border);border-left-width:4px;border-radius:6px;padding:10px;display:grid;grid-template-columns:90px 1fr auto;gap:10px;align-items:center;background:var(--surface-soft)}.history-list div.correct{border-left-color:var(--ok)}.history-list div.failed{border-left-color:var(--bad)}.history-list span,.history-list small{color:var(--muted)}.history-list span{font-weight:750}.topic-stats h2{display:flex;gap:8px;align-items:center;font-size:18px}.topic-grid{margin-top:14px;display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:10px}.topic-grid div{background:var(--surface-soft);border-radius:6px;padding:12px;display:grid;gap:4px}.topic-grid progress{width:100%;height:8px;accent-color:var(--accent)}.failed-panel h2{margin:0 0 12px;font-size:18px}.failed-list{display:grid;gap:8px}.failed-list button{border:1px solid var(--border);border-left:4px solid var(--bad);background:var(--surface);border-radius:6px;padding:10px;display:grid;grid-template-columns:60px 1fr;gap:10px;text-align:left}.failed-list span{color:var(--text-soft);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.topic-grid span{color:var(--muted);font-size:13px}.advanced-stats{display:grid;gap:18px}.advanced-stats h2,.advanced-stats h3{margin:0;display:flex;align-items:center;gap:8px}.advanced-stats h2{font-size:18px}.advanced-stats h3{font-size:15px}.attempt-summary{display:grid;grid-template-columns:repeat(3,minmax(160px,1fr));gap:10px}.attempt-summary div{background:var(--surface-soft);border-radius:6px;padding:14px;display:grid;gap:4px}.attempt-summary span,.attempt-summary small,.daily-list span,.rank-list span,.rank-list small{color:var(--muted)}.attempt-summary strong{font-size:24px}.stats-columns{display:grid;grid-template-columns:minmax(220px,.8fr) minmax(280px,1.2fr);gap:16px;align-items:start}.stats-columns>div{display:grid;gap:10px}.daily-list,.rank-list{display:grid;gap:8px}.daily-list div{min-height:48px;border:1px solid var(--border);border-radius:6px;padding:10px;display:flex;align-items:center;justify-content:space-between;gap:12px;background:var(--surface)}.daily-list span{font-size:13px;white-space:nowrap}.rank-list button{width:100%;border:1px solid var(--border);border-left:4px solid var(--bad);border-radius:6px;padding:10px;display:grid;grid-template-columns:58px 1fr;gap:4px 10px;text-align:left;background:var(--surface);color:var(--text)}.rank-list button:hover{background:var(--surface-soft)}.rank-list strong{grid-row:span 2}.rank-list small{grid-column:2;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.empty{min-height:240px;display:grid;place-items:center;color:var(--muted)}.empty-inline{margin:0;color:var(--muted);font-size:14px;padding:10px}@media (max-width: 920px){.app-frame{grid-template-columns:1fr}.sidebar{position:static;grid-template-columns:repeat(3,minmax(0,1fr))}.sidebar button{justify-content:center}.workspace,.users-layout{grid-template-columns:1fr}.user-row{grid-template-columns:1fr 1fr}.question-list{position:static;max-height:420px}.stats{grid-template-columns:repeat(2,minmax(120px,1fr))}.attempt-summary,.stats-columns{grid-template-columns:1fr}.picker label,.controls label{min-width:min(100%,280px)}}@media (max-width: 560px){.app-header{height:auto;align-items:flex-start;gap:12px;padding:12px 14px}.app-frame{padding:12px}.sidebar{grid-template-columns:1fr}.question-row{grid-template-columns:52px 1fr 20px}.answer-actions,.controls,.picker,.import-panel{align-items:stretch}.answer-actions>*,.controls>*,.picker>*,.import-panel>*,.user-row>*,.password-reset{width:100%}.user-row,.password-reset,.attempt-summary{grid-template-columns:1fr}.daily-list div{align-items:flex-start;flex-direction:column}.rank-list button{grid-template-columns:1fr}.rank-list strong,.rank-list small{grid-column:auto;grid-row:auto}.history-list div{grid-template-columns:1fr;align-items:start}}
