*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--primary: #2ecc71;--primary-dk: #27ae60;--dark: #0f172a;--dark-700: #1e293b;--dark-600: #334155;--gray-400: #94a3b8;--gray-200: #e2e8f0;--bg: #f8fafc;--white: #ffffff;--shadow-sm: 0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.06);--shadow-md: 0 4px 16px rgba(0,0,0,.1);--shadow-lg: 0 10px 40px rgba(0,0,0,.12);--radius: 14px;--radius-sm: 8px}html{scroll-behavior:smooth}body{font-family:Inter,system-ui,sans-serif;background:var(--bg);color:var(--dark);-webkit-font-smoothing:antialiased}.header{background:var(--dark);padding:0 5%;height:64px;display:flex;align-items:center;justify-content:space-between;position:sticky;top:0;z-index:100;box-shadow:0 2px 12px #0000004d}.header__logo{font-size:1.65rem;font-weight:800;color:var(--white);letter-spacing:-.5px}.header__logo span{color:var(--primary)}.header__nav{display:flex;align-items:center;gap:24px}.header__nav 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#2ecc7126}.material-card.active:after{content:"✓";position:absolute;top:12px;right:14px;width:22px;height:22px;background:var(--primary);color:#fff;border-radius:50%;font-size:.7rem;font-weight:700;display:flex;align-items:center;justify-content:center}.material-card__icon{font-size:2rem;line-height:1}.material-card__name{font-size:1rem;font-weight:700;color:var(--dark)}.material-card__price{font-size:.82rem;color:var(--gray-400);font-weight:500}.material-card__unit{font-size:.78rem;background:var(--gray-200);color:var(--dark-600);padding:3px 10px;border-radius:100px;font-weight:600}.calc-panel{background:var(--white);border-radius:var(--radius);padding:32px;box-shadow:var(--shadow-md);margin-bottom:32px}.calc-panel__title{font-size:1.1rem;font-weight:700;margin-bottom:24px;color:var(--dark);display:flex;align-items:center;gap:8px}.calc-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-bottom:24px}@media (max-width: 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5%;font-size:.82rem}.footer strong{color:var(--white)}