/* Smooth anchor scrolling, offset for the sticky 4rem nav */
html {
    scroll-behavior: smooth;
    scroll-padding-top: 5rem;
}

/* ── Scroll reveal ─────────────────────────────────────────────
   Hidden state only applies when JS is running (html.js),
   so content stays visible if JS fails or is disabled. */
html.js .reveal {
    opacity: 0;
    transform: translateY(1.25rem);
    transition:
        opacity 0.6s cubic-bezier(0.22, 1, 0.36, 1),
        transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
    transition-delay: var(--reveal-delay, 0s);
    will-change: opacity, transform;
}

html.js .reveal.is-visible {
    opacity: 1;
    transform: none;
    will-change: auto;
}

/* ── Animated link underline ── */
.link-underline {
    position: relative;
}

.link-underline::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: -0.25rem;
    height: 2px;
    border-radius: 1px;
    background: currentColor;
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.25s cubic-bezier(0.22, 1, 0.36, 1);
}

.link-underline:hover::after,
.link-underline:focus-visible::after {
    transform: scaleX(1);
}

/* ── Buttons ── */
.btn-animated {
    transition:
        background-color 0.2s ease,
        box-shadow 0.2s ease,
        transform 0.2s ease;
}

.btn-animated:hover {
    transform: translateY(-1px);
}

.btn-animated:active {
    transform: translateY(0) scale(0.98);
}

/* ── Reduced motion: show everything, animate nothing ── */
@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    html.js .reveal {
        opacity: 1;
        transform: none;
        transition: none;
    }

    .link-underline::after {
        transition: none;
    }

    .btn-animated,
    .btn-animated:hover,
    .btn-animated:active {
        transition: none;
        transform: none;
    }
}