:root{color-scheme:light;--bg: #f6f7fb;--card: #ffffff;--text: #111827;--muted: rgba(17, 24, 39, .65);--border: rgba(17, 24, 39, .1);--shadow: 0 10px 30px rgba(17, 24, 39, .06);--radius: 18px}html,body{height:100%;margin:0;padding:0;-webkit-text-size-adjust:100%;background:var(--bg);color:var(--text)}body{font-family:system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;overscroll-behavior-y:none;-webkit-overflow-scrolling:touch}button,a{touch-action:manipulation;-webkit-tap-highlight-color:transparent}button,b,h1,h2,h3,h4,p,span,div{-webkit-user-select:none;user-select:none}code,pre{-webkit-user-select:text;user-select:text}button{-webkit-appearance:none;appearance:none;border:none;background:none;color:inherit;font:inherit}.safe-area{padding-left:env(safe-area-inset-left);padding-right:env(safe-area-inset-right);padding-bottom:env(safe-area-inset-bottom)}.container{max-width:860px;margin:0 auto;padding:16px}.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:14px;margin:12px 0}.title{margin:0 0 8px;font-size:18px}.appname{font-weight:900;font-size:18px}.subtle{font-size:13px;color:var(--muted);margin-top:2px}.muted{color:var(--muted)}.tiny{font-size:12px}.topbar{position:sticky;top:0;z-index:1000;transform:translateZ(0);padding:10px 0 8px;background:linear-gradient(to bottom,var(--bg),rgba(246,247,251,.86));-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}.topbar-left,.topbar-right{display:flex;flex-direction:column}.topbar{display:flex;justify-content:space-between;gap:10px;align-items:flex-end}.pill{display:inline-flex;align-items:center;gap:6px;padding:10px 12px;border-radius:999px;border:1px solid var(--border);background:#fff;font-size:14px}.btn{padding:10px 12px;border-radius:12px;background:#fff;border:1px solid var(--border);font-size:16px;line-height:1;box-shadow:0 6px 14px #1118270a}.btn:disabled{opacity:.5}.btn-primary{background:#111827;border-color:#111827;color:#fff;font-weight:800}.progress-wrap{margin-top:4px}.progress-track{height:10px;background:#1118271a;border-radius:999px;overflow:hidden;border:1px solid rgba(17,24,39,.06)}.progress-fill{height:100%;background:#111827;border-radius:999px}.settings-row{display:grid;grid-template-columns:1fr;gap:10px}.toggle{display:flex;align-items:center;gap:10px;font-size:14px}.toggle input{width:18px;height:18px}.quiz{padding:16px}.question-meta{display:flex;justify-content:space-between;margin-bottom:6px}.question-title{margin:0 0 14px;font-size:18px;line-height:1.25}.options{display:grid;gap:10px}.option{text-align:left;padding:12px;border-radius:14px;border:1px solid rgba(17,24,39,.14);background:#fff;font-size:16px;line-height:1.35}.option.selected{background:#1118270a;border-color:#11182733}.option.opt-correct{border-color:#10b9818c;background:#10b98114}.option.opt-wrong{border-color:#ef44448c;background:#ef444414}.option-row{display:flex;justify-content:space-between;gap:12px;align-items:flex-start}.optkey{font-weight:900}.option-badge{white-space:nowrap;opacity:.9;font-size:13px}.nav{display:grid;grid-template-columns:1fr auto 1fr;gap:10px;align-items:center;margin-top:14px}.nav-center{text-align:center;font-size:13px}.callout{margin-top:12px;padding:10px 12px;border-radius:14px;border:1px solid var(--border);font-weight:800}.callout.ok{border-color:#10b9818c;background:#10b98114}.callout.bad{border-color:#ef44448c;background:#ef444414}.review-list{display:grid;gap:10px;margin-top:10px}.review-item{display:flex;justify-content:space-between;gap:12px;align-items:center;padding:12px;border-radius:14px;border:1px solid var(--border);background:#fff;text-align:left}.review-item.ok{border-color:#10b9818c;background:#10b9810f}.review-item.bad{border-color:#ef44448c;background:#ef44440f}.review-q{font-weight:800;margin-bottom:4px}.review-right{font-size:18px}.footer{margin:16px 0 24px;text-align:center}@media(max-width:420px){.container{padding:12px}.question-title{font-size:17px}.topbar{align-items:flex-start}.topbar-right{width:100%;flex-direction:row;gap:8px;justify-content:flex-end}}