/* Explain: Base reset, typography, animations, and page transitions. */
* {
    box-sizing: border-box;
}

html {
    background: var(--background-color);
    color: var(--text-color);
    scroll-padding-top: 84px;
}

body {
    margin: 0;
    overflow-x: hidden;
    text-rendering: optimizeLegibility;
}

img {
    display: block;
    max-width: 100%;
}

/* Subtle, swift page transition */
body {
    animation: pageFadeIn 0.25s ease-out forwards;
}

@keyframes pageFadeIn {
    from { opacity: 0.94; }
    to { opacity: 1; }
}

/* Subtle, gentle section appearance without delayed jumps */
.fade-in-section {
    opacity: 0;
    transform: translateY(8px);
    transition: opacity 0.35s ease-out, transform 0.35s ease-out;
    will-change: opacity, transform;
}

.fade-in-section.is-visible {
    opacity: 1;
    transform: none;
}

::selection {
    background: var(--accent-color);
    color: var(--primary-color);
}

input,
select,
textarea,
button {
    font: inherit;
}

input:focus,
select:focus,
textarea:focus,
button:focus-visible,
a:focus-visible,
summary:focus-visible {
    outline: 3px solid var(--sky-color);
    outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
    *,
    ::before,
    ::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
    .fade-in-section {
        opacity: 1 !important;
        transform: none !important;
    }
}