.site-logo { 
    font-size: 1.25rem; 
    font-weight: 700; 
    letter-spacing: -0.03em; 
    color: var(--color-primary); 
    text-decoration: none;
}
.nav__item { 
    font-size: 0.85rem; 
    font-weight: 500; 
    color: var(--color-text-muted); 
    padding: 0.5rem 1rem; 
    border-radius: 8px;
    transition: all 0.2s ease;
}
.nav__item:hover { 
    color: var(--color-text); 
    background: rgba(0, 0, 0, 0.04); 
}
@media (prefers-color-scheme: dark) {
    .nav__item:hover { background: rgba(255, 255, 255, 0.05); }
}

.btn { 
    display: inline-flex; 
    align-items: center; 
    justify-content: center; 
    font-weight: 600; 
    border-radius: 50px; 
    transition: all 0.3s cubic-bezier(0.23, 1, 0.32, 1);
    text-decoration: none;
}
.btn--header { 
    padding: 0.5rem 1.25rem; 
    background: var(--color-primary); 
    color: #fff; 
    font-size: 0.8rem;
}
.btn--header:hover { 
    transform: translateY(-1px); 
    filter: brightness(1.1);
}

.card, .calculator-widget { 
    background: var(--color-surface-glass); 
    backdrop-filter: blur(20px); 
    border: 1px solid var(--color-border); 
    border-radius: 24px; 
    padding: 3rem; 
}
input, select { 
    width: 100%; 
    padding: 1rem; 
    background: var(--color-surface); 
    border: 1px solid var(--color-border); 
    border-radius: 10px; 
    color: var(--color-text); 
    font-size: 0.95rem; 
    transition: all 0.2s;
}
input:focus { 
    outline: none; 
    border-color: var(--color-primary); 
    box-shadow: 0 0 0 3px rgba(0,0,0,0.02); 
}