:root{--brand-bg:#0c0b10;--brand-bg-soft:#151419;--brand-surface:#1c1b22;--brand-surface-strong:#25242c;--brand-muted:#aaa7b5;--brand-border:#ffffff1f;--brand-radius:16px;--text-muted:#aaa7b5;--text-faint:#85818f;--border-1:#ffffff12;--border-2:#ffffff1f;--border-strong:#ffffff38;--bg-hover:#29272f;--accent:#8050e8;--accent-hover:#9060f2;--radius-sm:6px;--radius-md:8px;--radius-lg:8px;--radius-xl:16px;--fs-3xl:32px;--fs-4xl:32px;--ui-font:-apple-system, BlinkMacSystemFont, "Segoe UI", Inter, sans-serif}html,body{background:var(--bg-base)}body{--font-inter:var(--ui-font);font-family:var(--ui-font);letter-spacing:0}button,input,textarea,select{letter-spacing:0;font-family:inherit}html[data-theme=light]{--text-muted:#625d70;--text-faint:#716b7e}html[data-theme=amoled]{--text-muted:#aaa7b5;--text-faint:#85818f}:where(button,a,input,textarea,select,[contenteditable]):focus-visible{outline:2px solid var(--accent-text);outline-offset:3px}.sheet-fields{gap:20px;padding:12px 20px 24px;display:grid}.sheet-fields label{color:var(--text-secondary);gap:8px;font-size:14px;display:grid}.sheet-fields select,.sheet-fields input{border:1px solid var(--border-2);background:var(--bg-elev-2);width:100%;min-width:0;min-height:48px;color:var(--text-primary);border-radius:8px;padding:10px 12px;font-size:16px}.sheet-fields fieldset{border:0;min-width:0}.sheet-fields [role=radiogroup]{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;display:grid}.sheet-fields [role=radio]{text-align:left;border:1px solid var(--border-2);background:var(--bg-elev-2);min-height:48px;color:var(--text-secondary);font:inherit;border-radius:8px;justify-content:space-between;align-items:center;gap:8px;padding:12px;display:flex}.sheet-fields [role=radio][aria-checked=true]{background:var(--accent-soft);border-color:var(--accent);color:var(--accent-text)}.premium-feature{gap:18px;padding:12px 24px 28px;display:grid}.premium-feature>svg{color:var(--accent-text)}.premium-feature h2{letter-spacing:0;font-size:24px;line-height:1.3}.premium-feature p{color:var(--text-secondary);font-size:16px;line-height:1.6}.progress-page{gap:28px;max-width:760px;margin:auto;display:grid}.progress-page h2{font-size:18px}.progress-numbers{border-block:1px solid var(--border-1);grid-template-columns:repeat(2,minmax(0,1fr));gap:24px;padding-block:20px;display:grid}.progress-numbers div{gap:6px;display:grid}.progress-numbers strong{font-variant-numeric:tabular-nums;font-size:28px}.progress-numbers span{color:var(--text-muted);font-size:14px}.progress-empty{color:var(--text-secondary);padding-block:20px;line-height:1.6}.rank-list{padding:12px 0;list-style:none}.rank-list li{border-bottom:1px solid var(--border-1);color:var(--text-muted);justify-content:space-between;gap:16px;padding:12px 0;display:flex}.rank-list li[aria-current]{color:var(--accent-text)}summary{cursor:pointer;min-height:44px;padding-block:12px}@media (max-width:767px){input:not([type=checkbox]):not([type=radio]),select,textarea{font-size:16px}html[data-keyboard-open=true] nav[data-app-chrome=true]{visibility:hidden;pointer-events:none}[data-app-shell] h1{letter-spacing:0}}@media (prefers-reduced-motion:reduce){button:active{transform:none!important}}.onboarding-mobile{background:var(--bg-base);max-width:640px;margin:auto}.onboarding-mobile .onboarding-card{box-shadow:none;background:0 0;border:0;border-radius:0;padding:12px 0}.onboarding-mobile .onboarding-header h1,.onboarding-mobile .onboarding-welcome h1{letter-spacing:0;font-size:28px;line-height:1.3}.onboarding-mobile .onboarding-nav{padding:12px 0 max(12px, env(safe-area-inset-bottom));background:var(--bg-base);position:sticky;bottom:0}.onboarding-mobile .onboarding-nav-btn{min-height:48px}.onboarding-mobile .onboarding-choice{background:var(--bg-elev-1);border-color:var(--border-2);border-radius:8px;min-height:60px}.onboarding-mobile .onboarding-choice.active{background:var(--accent-soft);border-color:var(--accent)}.onboarding-language{color:var(--text-muted);gap:8px;margin-top:24px;font-size:14px;display:grid}.onboarding-language select{border:1px solid var(--border-2);background:var(--bg-elev-1);color:var(--text-primary);border-radius:8px;min-height:44px;padding:12px;font-size:16px}.onboarding-subjects{margin-top:16px}