.site-logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
    font-family: var(--font-heading);
}

.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    font-weight: 600;
    transition: all 0.2s;
    cursor: pointer;
}

.nav__item {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-text);
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    transition: all 0.3s cubic-bezier(0.23, 1, 0.32, 1);
    position: relative;
    opacity: 0.8;
}

.nav__item:hover {
    opacity: 1;
    background: rgba(var(--color-primary-rgb), 0.08);
    transform: translateY(-1px);
}

.nav__item::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--color-primary);
    transition: all 0.3s ease;
    transform: translateX(-50%);
}

.nav__item:hover::after,
.nav__item--active::after {
    width: 60%;
}

.nav__item--active {
    opacity: 1;
    color: var(--color-primary);
    font-weight: 600;
}

/* Tabbed Interface Styling */
.tabs {
    display: flex;
    gap: 0.5rem;
    border-bottom: 1px solid var(--color-border);
    margin-bottom: 2rem;
    padding-bottom: 0.25rem;
}

.tab-link {
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--color-text-muted);
    border-radius: var(--border-radius) var(--border-radius) 0 0;
    cursor: pointer;
    transition: all 0.2s;
    border: 1px solid transparent;
    border-bottom: none;
    margin-bottom: -1px;
}

.tab-link:hover {
    color: var(--color-primary);
    background: var(--color-background-alt);
}

.tab-link.active {
    color: var(--color-primary);
    background: white;
    border-color: var(--color-border);
    border-bottom-color: white;
    box-shadow: 0 -4px 12px rgba(0,0,0,0.03);
}

.card, .calculator-widget {
    background: white;
    border: 1px solid rgba(0,0,0,0.08);
    border-radius: 16px;
    padding: 3.5rem;
    box-shadow: 0 4px 24px rgba(0,0,0,0.02);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    box-shadow: 0 12px 32px rgba(0,0,0,0.04);
}

/* Trust Modules */
.expert-note {
    background: rgba(0,0,0,0.02);
    border-left: 4px solid var(--color-primary);
    padding: 2.5rem;
    margin: 4rem 0;
    border-radius: 0 12px 12px 0;
}

.expert-note__header {
    font-weight: 700;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    margin-bottom: 1rem;
    color: var(--color-primary);
    display: block;
}

.expert-note__content {
    font-style: italic;
    color: var(--color-text);
    opacity: 0.9;
}

.sources-list {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    border-top: 1px solid var(--color-border);
    margin-top: 5rem;
    padding-top: 2.5rem;
}