:root{--bg:#f4f7ff;--card:#fff;--text:#26324b;--muted:#7a869c;--primary:#5b6ef5;--primary-dark:#4557e0;--accent:#ffb62e;--ok:#22a55e;--ok-bg:#e5f8ed;--bad:#e0524f;--bad-bg:#fdeceb;--warn-bg:#fff5e0;--radius:16px;--shadow:0 4px 16px #26324b14}*{box-sizing:border-box}body{background:var(--bg);color:var(--text);margin:0;font-family:Segoe UI,system-ui,-apple-system,sans-serif}.app{flex-direction:column;min-height:100vh;display:flex}.header{background:var(--card);box-shadow:var(--shadow);z-index:10;flex-wrap:wrap;align-items:center;gap:20px;padding:12px 24px;display:flex;position:sticky;top:0}.brand{color:var(--primary);font-size:24px;font-weight:800;text-decoration:none}.nav{gap:16px;display:flex}.nav a{color:var(--text);font-weight:600;text-decoration:none}.nav a:hover{color:var(--primary)}.header-right{align-items:center;gap:12px;margin-left:auto;display:flex}.user-email{color:var(--muted);font-size:14px}.lang-switch{border:2px solid var(--primary);border-radius:999px;display:flex;overflow:hidden}.lang-switch button{cursor:pointer;color:var(--primary);background:0 0;border:none;padding:4px 12px;font-weight:700}.lang-switch button.active{background:var(--primary);color:#fff}.main{width:100%;max-width:960px;margin:0 auto;padding:24px 16px 64px}.card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:20px}.grid{grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px;margin-top:16px;display:grid}.page-head{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px;display:flex}h1{font-size:28px}.muted{color:var(--muted);font-size:14px}.notice{color:var(--muted);padding:16px}.notice-warn{background:var(--warn-bg);color:var(--text)}.notice-ok{background:var(--ok-bg);color:var(--text)}.error{background:var(--bad-bg);color:var(--bad);border-radius:8px;margin:12px 0;padding:10px 14px}.btn{cursor:pointer;text-align:center;border:none;border-radius:12px;padding:10px 18px;font-size:16px;font-weight:700;text-decoration:none;transition:transform 60ms,background .15s;display:inline-block}.btn:active{transform:scale(.97)}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-dark)}.btn-primary:disabled{opacity:.5;cursor:default}.btn-ghost{color:var(--primary);border:2px solid var(--primary);background:0 0}.btn-small{padding:6px 12px;font-size:14px}.form{flex-direction:column;gap:14px;display:flex}.form label{flex-direction:column;gap:6px;font-size:14px;font-weight:600;display:flex}.form input,.form select,.answer-form input{color:var(--text);background:#fff;border:2px solid #dfe5f1;border-radius:10px;padding:10px 12px;font-size:16px}.form input:focus,.answer-form input:focus{border-color:var(--primary);outline:none}.form-row{margin-top:16px}.auth-card{flex-direction:column;gap:12px;max-width:380px;margin:48px auto;display:flex}.auth-title{text-align:center;color:var(--primary);margin:0}.auth-tagline{text-align:center;color:var(--muted);margin:0 0 8px}.auth-link{text-align:center;color:var(--primary)}.auth-hint{color:var(--muted,#667);margin:0;font-size:14px}.child-card h2{margin:0}.child-head{align-items:center;gap:12px;display:flex}.child-avatar{font-size:40px}.stats{gap:14px;margin:12px 0;font-weight:700;display:flex}.card-actions{flex-wrap:wrap;gap:10px;display:flex}.topic-section{margin-top:24px}.topic-card,.lesson-card{color:var(--text);text-decoration:none;transition:transform .1s;display:block;position:relative}.topic-card:hover,.lesson-card:hover{transform:translateY(-3px)}.topic-title{margin-bottom:6px;font-size:18px;font-weight:700}.badge{border-radius:999px;padding:3px 10px;font-size:12px;font-weight:700;display:inline-block}.badge-premium{background:var(--accent);color:#5c3d00}.badge-neutral{color:var(--muted);background:#edf0f7}.badge-info{color:var(--primary);background:#e3e9ff}.badge-warn{background:var(--warn-bg);color:#a06a00}.badge-ok{background:var(--ok-bg);color:var(--ok)}.badge-excellent{background:var(--accent);color:#5c3d00}.lesson-card{align-items:center;gap:14px;display:flex}.lesson-number{color:var(--primary);background:#e3e9ff;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:48px;height:48px;font-size:26px;font-weight:800;display:flex}.back-link{color:var(--primary);font-weight:600;text-decoration:none}.explanation{background:#fffceb;margin:16px 0;font-size:18px;line-height:1.5}.player-head{justify-content:space-between;align-items:center;margin-bottom:16px;display:flex}.player-progress{color:var(--primary);font-weight:800}.exercise-card{margin-top:8px}.question{margin-top:0;font-size:24px}.exercise-image{border-radius:12px;max-width:100%;margin-bottom:12px}.options{flex-wrap:wrap;gap:12px;display:flex}.btn-option{color:var(--text);background:#eef1fb;border:2px solid #0000;padding:14px 26px;font-size:20px}.btn-option:hover:not(:disabled){border-color:var(--primary)}.btn-compare{min-width:72px;font-size:28px}.answer-form{gap:10px;margin-top:8px;display:flex}.answer-form input{flex:1;font-size:20px}.feedback{border-radius:12px;flex-direction:column;align-items:flex-start;gap:10px;margin-top:18px;padding:16px;display:flex}.feedback-ok{background:var(--ok-bg)}.feedback-bad{background:var(--bad-bg)}.feedback-title{font-size:18px;font-weight:800}.finish-card{text-align:center;flex-direction:column;align-items:center;gap:12px;max-width:440px;margin:48px auto;display:flex}.finish-stars{font-size:44px}.tiles{grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:12px;margin:16px 0;display:grid}.tile{flex-direction:column;align-items:center;gap:4px;padding:16px;display:flex}.tile-value{font-size:22px;font-weight:800}.recommendation{background:#fffceb;margin:16px 0}.progress-list{flex-direction:column;gap:12px;margin-top:12px;display:flex}.progress-row-head{justify-content:space-between;align-items:center;gap:10px;margin-bottom:8px;display:flex}.bar{background:#edf0f7;border-radius:999px;height:10px;margin-bottom:6px;overflow:hidden}.bar-fill{background:linear-gradient(90deg, var(--primary), var(--accent));border-radius:999px;height:100%}.tariff-card{text-align:center;flex-direction:column;gap:12px;display:flex}.tariff-card h2{margin:0}.price{color:var(--primary);font-size:26px;font-weight:800}.checkout{text-align:center;border:2px dashed var(--accent);flex-direction:column;align-items:center;gap:10px;margin-top:20px;display:flex}@media (width<=600px){.header{gap:10px;padding:10px 12px}.user-email{display:none}h1{font-size:22px}.question{font-size:20px}}.admin h1{margin:8px 0 16px}.admin-grid{grid-template-columns:repeat(auto-fit,minmax(240px,1fr));align-items:start;gap:16px;display:grid}.admin-col h2{margin:0 0 12px;font-size:18px}.admin-col-wide{grid-column:1/-1}.admin-placeholder{color:var(--muted);font-size:14px}.admin-list{flex-direction:column;gap:6px;margin:0 0 12px;padding:0;list-style:none;display:flex}.admin-item{background:var(--bg);text-align:left;cursor:pointer;width:100%;color:var(--text);border:2px solid #0000;border-radius:10px;justify-content:space-between;align-items:center;gap:8px;padding:8px 12px;font-size:14px;display:flex}.admin-item:hover{border-color:var(--primary)}.admin-item.active{border-color:var(--primary);background:#eef1ff;font-weight:700}.admin-badge{white-space:nowrap;border-radius:999px;padding:2px 8px;font-size:11px;font-weight:700}.admin-badge.ok{background:var(--ok-bg);color:var(--ok)}.admin-badge.muted{background:var(--bg);color:var(--muted);border:1px solid var(--muted)}.admin-form{border-top:1px dashed var(--muted);margin-top:12px;padding-top:12px}.admin-form label{font-size:13px}.admin-check{align-items:center;gap:8px;display:flex;flex-direction:row!important}.admin-exercises{flex-direction:column;gap:6px;margin:0 0 12px;padding:0;list-style:none;display:flex}.admin-exercise{background:var(--bg);border-radius:10px;padding:8px 12px;font-size:14px}.admin-options{flex-direction:column;gap:8px;display:flex}.admin-options-title{font-size:13px;font-weight:700}.admin-option-row{align-items:center;gap:8px;display:flex}.admin-option-row input[type=text],.admin-option-row input:not([type]){flex:1;min-width:0}.admin-generate{flex-wrap:wrap;align-items:flex-end;gap:12px;margin-bottom:12px;display:flex}.admin-generate label{flex-direction:column;gap:4px;font-size:13px;display:flex}.admin-generate input{width:90px}.add-card{border:2px dashed var(--muted);color:var(--muted);cursor:pointer;background:0 0;min-height:120px;font-size:16px;font-weight:700}.add-card:hover{border-color:var(--primary);color:var(--primary)}.teacher-class.selected{outline:2px solid var(--primary)}.teacher-students{margin-top:24px}.chart-bars{align-items:flex-end;gap:8px;height:190px;padding:12px 4px 0;display:flex}.chart-col{flex-direction:column;flex:1;justify-content:flex-end;align-items:center;gap:4px;min-width:0;display:flex}.chart-bar{background:var(--primary);border-radius:4px 4px 0 0;width:100%;max-width:40px}.chart-value{font-size:12px;font-weight:700}.chart-label{color:var(--muted);white-space:nowrap;font-size:11px}.analytics-table{border-collapse:collapse;width:100%;margin-top:16px;font-size:13px}.analytics-table th,.analytics-table td{text-align:left;border-top:1px solid #eef1f8;padding:6px 10px}.analytics-table th{color:var(--muted);font-weight:600}.admin-image-preview{border-radius:10px;max-width:160px;max-height:120px}.admin-image-thumb{border-radius:8px;max-height:60px;margin-top:6px;display:block}.admin-image-gen{margin-top:6px;display:block}.plan-list{margin:0;padding:0;list-style:none}.plan-item{border-top:1px solid #eef1f8;justify-content:space-between;gap:12px;padding:8px 0;display:flex}.plan-item:first-child{border-top:none}.plan-card.plan-done{opacity:.65}