:root{color-scheme:light;--bg: #f5f7fb;--panel: #ffffff;--text: #162033;--muted: #667085;--line: #d9e0ea;--primary: #1e6bff;--primary-strong: #1554cf;--accent: #0f9f7a;--danger: #d92d20;--shadow: 0 18px 45px rgba(23, 37, 84, .1)}*{box-sizing:border-box}body{margin:0;min-height:100vh;background:radial-gradient(circle at top left,rgba(30,107,255,.12),transparent 32rem),linear-gradient(120deg,rgba(15,159,122,.08),transparent 28rem),var(--bg);color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}button,input,textarea,select{font:inherit}a{color:inherit;text-decoration:none}.app-shell{display:grid;grid-template-columns:280px minmax(0,1fr);min-height:100vh}.sidebar{position:sticky;top:0;display:flex;flex-direction:column;gap:28px;height:100vh;padding:28px;border-right:1px solid var(--line);background:#ffffffd6;-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px)}.brand{display:flex;align-items:center;gap:12px}.brand-mark{display:grid;width:42px;height:42px;place-items:center;border-radius:8px;background:var(--primary);color:#fff;font-weight:800}.brand strong,.brand small{display:block}.brand small,.support-box p,.panel p,.result-copy p,.price-card p{color:var(--muted);line-height:1.55}.nav-list{display:grid;gap:8px}.nav-list a{border-radius:8px;padding:12px 14px;color:var(--muted);font-weight:700}.nav-list a.active,.nav-list a:hover{background:#eaf1ff;color:var(--primary-strong)}.support-box{margin-top:auto;border:1px solid var(--line);border-radius:8px;padding:16px;background:#f8fbff}main{padding:34px}.view{max-width:1180px;margin:0 auto}.topbar,.quiz-header{display:flex;align-items:flex-start;justify-content:space-between;gap:24px;margin-bottom:28px}.eyebrow{margin:0 0 8px;color:var(--accent);font-size:.78rem;font-weight:800;letter-spacing:0;text-transform:uppercase}h1,h2,p{margin-top:0}h1{max-width:820px;margin-bottom:0;font-size:clamp(2rem,4vw,4rem);line-height:1.02;letter-spacing:0}h2{margin-bottom:6px;font-size:1.2rem;line-height:1.25}.workspace-grid{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(320px,.9fr);gap:18px}.panel,.question-card,.price-card{border:1px solid var(--line);border-radius:8px;background:var(--panel);box-shadow:var(--shadow)}.panel{padding:22px}.builder-panel{grid-row:span 2}.panel-title{display:flex;align-items:flex-start;gap:14px;margin-bottom:18px}.step{display:grid;flex:0 0 auto;width:32px;height:32px;place-items:center;border-radius:8px;background:#edf4ff;color:var(--primary);font-weight:800}.drop-zone{display:grid;min-height:250px;place-items:center;gap:8px;margin-bottom:18px;border:2px dashed #a9b9d4;border-radius:8px;padding:28px;text-align:center;cursor:pointer;background:linear-gradient(135deg,#1e6bff14,#0f9f7a14),#fbfdff}.drop-zone input,.compact-upload input{position:absolute;width:1px;height:1px;opacity:0}.upload-icon{display:grid;width:56px;height:56px;place-items:center;border-radius:50%;background:#fff;color:var(--primary);font-size:2rem;font-weight:300;box-shadow:0 8px 24px #1e6bff29}.form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}label{display:grid;gap:7px;color:var(--muted);font-size:.92rem;font-weight:700}input,textarea,select{width:100%;border:1px solid var(--line);border-radius:8px;padding:12px 13px;background:#fff;color:var(--text);outline:none}input:focus,textarea:focus,select:focus{border-color:var(--primary);box-shadow:0 0 0 3px #1e6bff24}.segmented{display:grid;grid-template-columns:1fr 1fr;gap:6px;margin-bottom:16px;border-radius:8px;padding:5px;background:#eef3fa}.segmented button{border:0;border-radius:8px;padding:10px;background:transparent;color:var(--muted);cursor:pointer;font-weight:800}.segmented button.active{background:#fff;color:var(--primary-strong);box-shadow:0 3px 12px #17255417}.compact-upload{display:block;border:1px dashed #a9b9d4;border-radius:8px;padding:14px;color:var(--muted);cursor:pointer}.check-row{display:flex;align-items:center;gap:10px}.check-row input{width:18px;height:18px;accent-color:var(--primary)}.action-row,.question-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}.primary-button,.secondary-button,.ghost-button,.danger-button,.icon-button{display:inline-flex;align-items:center;justify-content:center;min-height:42px;border-radius:8px;padding:0 16px;border:1px solid transparent;cursor:pointer;font-weight:800}.primary-button{background:var(--primary);color:#fff}.primary-button:hover{background:var(--primary-strong)}.secondary-button{background:#e8fbf6;color:#08745a}.danger-button{border-color:#f6a6a0;background:#fff1f0;color:var(--danger)}.danger-button:hover{background:#ffe4e2}.ghost-button,.icon-button{border-color:var(--line);background:#fff;color:var(--text)}.disabled,button:disabled{opacity:.48;pointer-events:none}.result-panel{display:grid;grid-template-columns:auto minmax(0,1fr);align-items:center;gap:18px}.result-stat{display:grid;width:112px;height:112px;place-items:center;border-radius:8px;background:#f1f7ff;color:var(--primary)}.result-stat span{font-size:2.5rem;font-weight:900}.result-stat small{color:var(--muted);font-weight:800;text-align:center}.quiz-layout{display:grid;gap:18px}.ghost-link{color:var(--primary);font-weight:800}.lock-panel{max-width:680px}.quiz-tools{display:flex;align-items:center;flex-wrap:wrap;gap:14px;margin-bottom:16px}.quiz-progress{display:grid;grid-template-columns:auto minmax(0,1fr);gap:12px;align-items:center;margin-bottom:16px;font-weight:800}.quiz-progress div{height:10px;overflow:hidden;border-radius:8px;background:#e6edf7}.quiz-progress div span{display:block;width:0%;height:100%;background:var(--accent);transition:width .18s ease}.question-card{padding:26px}.question-meta{display:flex;justify-content:space-between;gap:14px;margin-bottom:14px;color:var(--muted);font-weight:800}.question-card h2{font-size:clamp(1.25rem,2.4vw,2rem);line-height:1.25}.keyboard-hint{margin-bottom:14px;color:var(--muted);font-size:.92rem;font-weight:700}.options-list{display:grid;gap:10px}.option-button{display:flex;align-items:center;gap:12px;width:100%;min-height:54px;justify-content:flex-start;border:1px solid var(--line);border-radius:8px;padding:14px 16px;background:#fff;color:var(--text);cursor:pointer;text-align:left;font-weight:700}.option-key{display:grid;flex:0 0 auto;width:28px;height:28px;place-items:center;border-radius:8px;background:#eef3fa;color:var(--primary-strong);font-size:.85rem;font-weight:900}.option-button.correct{border-color:#8bd7c1;background:#e7fbf5;color:#05664f}.option-button.wrong{border-color:#f6a6a0;background:#fff1f0;color:var(--danger)}.mistakes-list,.library-list{display:grid;gap:12px}.mistake-item,.library-item{border:1px solid var(--line);border-radius:8px;padding:14px;background:#fff}.library-item{display:grid;gap:12px}.library-title-row{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:12px;align-items:end}.library-actions{display:flex;flex-wrap:wrap;gap:10px}.library-badges{display:flex;flex-wrap:wrap;gap:8px}.pin-badge{width:fit-content;border-radius:999px;padding:5px 10px;background:#fff4d6;color:#8a5a00;font-size:.8rem;font-weight:800}.archive-badge{width:fit-content;border-radius:999px;padding:5px 10px;font-size:.8rem;font-weight:800;background:#eef3fa;color:#344054}.compact-action{min-height:36px;padding:0 12px;font-size:.9rem}.dialog-backdrop{position:fixed;inset:0;display:grid;place-items:center;padding:16px;background:#09122373;z-index:20}.report-form{display:grid;width:min(560px,100%);gap:16px;border:1px solid var(--line);border-radius:8px;padding:22px;background:#fff;box-shadow:var(--shadow)}.answer-editor{display:grid;width:min(680px,100%);max-height:min(760px,92vh);overflow:auto;gap:16px;border:1px solid var(--line);border-radius:8px;padding:22px;background:#fff;box-shadow:var(--shadow)}.answer-editor-options{display:grid;gap:10px}.answer-choice{display:grid;grid-template-columns:auto auto minmax(0,1fr);align-items:center;gap:10px;border:1px solid var(--line);border-radius:8px;padding:12px;background:#fbfdff;color:var(--text)}.answer-choice input{width:18px;height:18px;accent-color:var(--primary)}.dialog-title{display:flex;align-items:center;justify-content:space-between;gap:12px}.dialog-title h2{margin:0}.icon-button{width:38px;min-height:38px;padding:0;font-size:1.35rem}menu{display:flex;justify-content:flex-end;gap:10px;margin:0;padding:0}#toast{position:fixed;right:18px;bottom:18px;max-width:420px;transform:translateY(18px);border-radius:8px;padding:14px 16px;background:#101828;color:#fff;opacity:0;pointer-events:none;transition:.18s ease;z-index:30}#toast.show{transform:translateY(0);opacity:1}@media(max-width:920px){.app-shell{grid-template-columns:1fr}.sidebar{position:static;height:auto;padding:18px}.support-box{display:none}main{padding:18px}.workspace-grid,.form-grid,.result-panel{grid-template-columns:1fr}}@media(max-width:560px){h1{font-size:2rem}.topbar,.quiz-header,.quiz-tools,.action-row{display:grid}.primary-button,.secondary-button,.ghost-button,.danger-button{width:100%}.library-title-row{grid-template-columns:1fr}}