:root{--tg-bg: #ffffff;--tg-text: #1c1c1e;--tg-hint: #8e8e93;--tg-link: #2481cc;--tg-button: #2481cc;--tg-button-text: #ffffff;--tg-secondary-bg: #f0f0f4}*{box-sizing:border-box}html,body{margin:0;padding:0}body{background:var(--tg-bg);color:var(--tg-text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;font-size:16px;line-height:1.5;-webkit-font-smoothing:antialiased}#app{max-width:640px;margin:0 auto;padding:16px}h1,h2,h3{line-height:1.25;margin:0 0 12px}h1{font-size:1.5rem}h2{font-size:1.25rem}h3{font-size:1.1rem}p{margin:0 0 12px}a{color:var(--tg-link)}.hint{color:var(--tg-hint)}.card{background:var(--tg-secondary-bg);border-radius:12px;padding:16px;margin-bottom:16px}.btn{display:inline-block;border:none;border-radius:10px;background:var(--tg-button);color:var(--tg-button-text);font-size:1rem;font-weight:600;padding:12px 20px;cursor:pointer}.btn:disabled{opacity:.6;cursor:default}.center{text-align:center;padding:40px 16px}.spinner{width:36px;height:36px;margin:0 auto 16px;border:3px solid var(--tg-hint);border-top-color:var(--tg-link);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}video{width:100%;border-radius:12px;background:#000}