.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-8);
    font-family: var(--font-body);
    font-size: 13px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-radius: var(--border-radius);
    transition: background-color var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast), opacity var(--transition-fast);
    padding: 14px 28px;
    line-height: 1;
    text-align: center;
    border: 1.5px solid transparent;
}

.btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

/* Variants */
.btn-primary {
    background-color: var(--color-ink-black);
    color: var(--color-pure-white);
    border-color: var(--color-ink-black);
}
.btn-primary:not(:disabled):hover {
    background-color: var(--color-signal-red);
    border-color: var(--color-signal-red);
}

.btn-accent {
    background-color: var(--color-signal-red);
    color: var(--color-pure-white);
    border-color: var(--color-signal-red);
}
.btn-accent:not(:disabled):hover {
    background-color: var(--color-ink-black);
    border-color: var(--color-ink-black);
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-ink-black);
    border-color: var(--color-ink-black);
}
.btn-secondary:not(:disabled):hover {
    background-color: var(--color-ink-black);
    color: var(--color-pure-white);
}

.btn-ghost {
    background-color: transparent;
    color: var(--color-ink-black);
    border: none;
    padding-left: 0;
    padding-right: 0;
}
.btn-ghost:not(:disabled):hover {
    color: var(--color-signal-red);
    text-decoration: underline;
}

/* Sizes */
.btn-small {
    padding: 8px 16px;
    font-size: 11px;
}
.btn-large {
    padding: 18px 36px;
    font-size: 15px;
}