/**
 * Buttons use contrast and rules rather than elevation.
 */
button,
.btn,
a.btn {
    display: inline-flex;
    min-height: 2.75rem;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-2);
    padding: 0.65rem 1rem;
    border: 1px solid var(--color-primary);
    border-radius: 0;
    background: var(--color-primary);
    color: var(--color-text-contrast);
    font-family: var(--font-family);
    font-size: var(--font-size-sm);
    font-weight: 700;
    letter-spacing: 0.04em;
    line-height: 1.2;
    text-align: center;
    text-decoration: none;
    text-transform: uppercase;
    cursor: pointer;
    transition:
        background-color var(--transition-fast),
        border-color var(--transition-fast),
        color var(--transition-fast);
}

button:hover,
.btn:hover,
a.btn:hover {
    border-color: var(--color-primary-light);
    background: var(--color-primary-light);
    color: var(--color-text-contrast);
    text-decoration: none;
}

button:active,
.btn:active,
a.btn:active {
    border-color: var(--color-text);
}

.btn.btn-secondary,
.btn.btn-outline-primary,
.btn--secondary {
    border-color: var(--color-border-strong);
    background: transparent;
    color: var(--color-text);
}

.btn.btn-secondary:hover,
.btn.btn-outline-primary:hover,
.btn--secondary:hover {
    border-color: var(--color-text);
    background: var(--color-text);
    color: var(--color-bg);
}

.btn.btn-secondary-filled {
    border-color: var(--color-secondary);
    background: var(--color-secondary);
    color: var(--color-text-contrast);
}

.btn.btn-secondary-filled:hover {
    border-color: var(--color-secondary-light);
    background: var(--color-secondary-light);
}

.btn.btn-accent {
    border-color: var(--color-primary);
    background: transparent;
    color: var(--color-primary-link);
}

.btn.btn-accent:hover {
    background: var(--color-primary);
    color: var(--color-text-contrast);
}

.btn-sm,
.btn.btn-sm {
    min-height: 2.25rem;
    padding: 0.4rem 0.7rem;
    font-size: var(--font-size-xs);
}

.btn--lg {
    min-height: 3rem;
    padding: 0.8rem 1.3rem;
}

.icon-button {
    width: 2.75rem;
    min-width: 2.75rem;
    padding: 0;
    border-color: transparent;
    background: transparent;
    color: var(--color-text);
}

.icon-button:hover {
    border-color: var(--color-border-strong);
    background: transparent;
    color: var(--color-primary-link);
}

button:disabled,
.btn[aria-disabled="true"] {
    opacity: 0.5;
    cursor: not-allowed;
}