:root{--color-bg: var(--tg-theme-bg-color, #0f0f12);--color-text: var(--tg-theme-text-color, #f5f5f7);--color-primary: #6c5ce7;--color-primary-hover: #5b4cdb;--color-surface: rgba(255, 255, 255, .06);--color-border: rgba(255, 255, 255, .12);--header-height: 56px;--radius: 12px;--transition: .25s ease}*,*:before,*:after{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;background:var(--color-bg);color:var(--color-text);line-height:1.5}.app{min-height:100dvh}.header{position:sticky;top:0;z-index:100;display:flex;align-items:center;justify-content:space-between;height:var(--header-height);padding:0 16px;background:transparent;transition:background var(--transition),box-shadow var(--transition)}.header--scrolled{background:#0f0f12eb;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);box-shadow:0 4px 24px #00000059}.header__logo{font-weight:700;color:inherit;text-decoration:none}.header__nav{display:none;gap:12px}.header__nav--open{display:flex;flex-direction:column;position:absolute;top:var(--header-height);right:16px;left:16px;padding:16px;background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius)}.header__link{color:inherit;text-decoration:none;padding:8px 0}.header__link:hover,.header__link:focus-visible{color:var(--color-primary)}.header__burger{width:32px;height:32px;border:none;background:linear-gradient(to bottom,var(--color-text) 0 20%,transparent 20% 40%,var(--color-text) 40% 60%,transparent 60% 80%,var(--color-text) 80% 100%);cursor:pointer}@media(min-width:768px){.header__burger{display:none}.header__nav{display:flex;flex-direction:row;position:static;padding:0;background:none;border:none}}.section{padding:48px 16px;scroll-margin-top:var(--header-height)}.section__title{margin:0 0 24px;font-size:1.5rem}.hero{min-height:70dvh;display:flex;align-items:center;justify-content:center;text-align:center;background:radial-gradient(ellipse at top,rgba(108,92,231,.25),transparent 60%)}.hero__title{font-size:clamp(1.75rem,5vw,2.5rem);margin:0 0 12px}.hero__text{opacity:.85;max-width:32ch;margin:0 auto 24px}.button{display:inline-flex;align-items:center;justify-content:center;padding:12px 20px;border:none;border-radius:var(--radius);font-size:1rem;cursor:pointer;transition:transform var(--transition),background var(--transition)}.button:active{transform:scale(.97)}.button--primary{background:var(--color-primary);color:#fff}.button--primary:hover{background:var(--color-primary-hover)}.quiz__panel{padding:20px;background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius)}.quiz__options{display:grid;gap:10px;margin-top:16px}.quiz__option{width:100%;text-align:left;background:#ffffff0a;color:inherit}.quiz__timer{font-size:.875rem;opacity:.8;margin-bottom:12px}.quiz__timer--expired{color:#ff6b6b}.quiz__result--ok{color:#2ecc71}.quiz__result--fail{color:#ff6b6b}.stats__grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}@media(min-width:480px){.stats__grid{grid-template-columns:repeat(3,1fr)}}.stats__card{padding:16px;background:var(--color-surface);border-radius:var(--radius);border:1px solid var(--color-border)}.stats__label{display:block;font-size:.75rem;opacity:.7}.stats__value{font-size:1.25rem}.leaderboard__list{list-style:none;margin:0;padding:0}.leaderboard__item{display:grid;grid-template-columns:48px 1fr auto;gap:8px;padding:12px 16px;border-bottom:1px solid var(--color-border)}.leaderboard__item--you{background:#6c5ce726;border-radius:var(--radius)}.donate__presets{display:flex;flex-wrap:wrap;gap:10px}.donate__btn{background:var(--color-surface);color:inherit;border:1px solid var(--color-border)}.footer{padding:24px 16px;text-align:center;opacity:.5;font-size:.875rem}