:root{color-scheme:light dark;font-family:Figtree,Segoe UI,sans-serif;line-height:1.4}body{margin:0;min-height:100vh;background:linear-gradient(150deg,#f3f6f7,#dde8e0,#cad8dd);color:#152020}.dark body{background:linear-gradient(150deg,#172123,#121916,#1d2730);color:#f5f8f7}main{max-width:760px;margin:0 auto;padding:2rem 1rem}.card{background:#ffffffc2;border:1px solid rgba(0,0,0,.08);border-radius:12px;padding:1rem}.dark .card{background:#00000040;border-color:#ffffff1f}button{border:1px solid #2d5a42;background:#eef7ed;color:#183022;border-radius:8px;padding:.35rem .7rem;cursor:pointer}.dark button{border-color:#8bbf9f;background:#1f3025;color:#edf8f0}