:root{--quadra-accent:#00a3a0;--quadra-accent-deep:#007e7c;--quadra-ink:#0e1218;--quadra-paper:#f3f5f7}*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,sans-serif;background:var(--quadra-paper);color:var(--quadra-ink)}a{color:var(--quadra-accent-deep)}button{background:var(--quadra-accent);color:#fff;border:none;border-radius:10px;padding:10px 16px;cursor:pointer;font-weight:600}button:hover{background:var(--quadra-accent-deep)}.card{background:#fff;border-radius:16px;padding:24px;box-shadow:0 4px 24px rgba(14,18,24,.08)}