*{box-sizing:border-box}
:root{font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:#f7f7f7;background:#050505}
body{margin:0;min-height:100vh;background:
radial-gradient(circle at 50% 0%,rgba(255,255,255,.09),transparent 35%),
linear-gradient(180deg,#090909 0%,#030303 100%);display:flex;justify-content:center}
.app{width:min(900px,92vw);min-height:100vh;padding:13vh 0 40px;text-align:center}
.brand{font-size:clamp(42px,7vw,76px);font-weight:800;letter-spacing:-.07em}
.brand span{color:#f97316}
.subtitle{margin:10px 0 44px;color:#858585;font-size:15px}
.calculator{background:rgba(20,20,20,.82);border:1px solid #272727;border-radius:24px;padding:18px;box-shadow:0 30px 90px rgba(0,0,0,.5);backdrop-filter:blur(18px)}
.input-wrap{display:flex;gap:10px}
input{width:100%;height:68px;border:1px solid #303030;border-radius:16px;background:#0b0b0b;color:#fff;padding:0 20px;font-size:20px;outline:none;transition:.2s}
input:focus{border-color:#555;box-shadow:0 0 0 3px rgba(249,115,22,.1)}
#solve{width:68px;border:0;border-radius:16px;background:#f97316;color:#fff;font-size:28px;font-weight:700;cursor:pointer}
#solve:hover{background:#fb8535}
.answer{min-height:120px;display:flex;align-items:center;justify-content:center;padding:28px 15px 10px;font-size:clamp(32px,6vw,62px);font-weight:750;letter-spacing:-.04em;overflow-wrap:anywhere}
.error{min-height:24px;color:#ff6b6b;font-size:14px}
.examples{display:flex;flex-wrap:wrap;justify-content:center;gap:8px;margin-top:12px}
.examples button{background:#151515;color:#aaa;border:1px solid #292929;border-radius:999px;padding:9px 13px;cursor:pointer}
.examples button:hover{color:#fff;border-color:#444}
footer{margin-top:25px;color:#555;font-size:12px}
@media(max-width:600px){.app{padding-top:9vh}.calculator{padding:12px;border-radius:19px}input{height:60px;font-size:17px}#solve{width:60px;height:60px}.answer{min-height:100px}}