/* Explain: Base page behavior, typography, and motion defaults */
* {
    box-sizing: border-box;
}

html {
    background: var(--background-color);
    color: var(--text-color);
    scroll-padding-top: 7rem;
}

body {
    overflow-x: hidden;
    background:
        radial-gradient(circle at 8% 12%, rgba(227, 38, 54, 0.08), transparent 26rem),
        radial-gradient(circle at 92% 28%, rgba(25, 118, 210, 0.08), transparent 28rem),
        var(--background-color);
    font-family: var(--font-body);
    text-rendering: optimizeLegibility;
}

::selection {
    background: rgba(227, 38, 54, 0.26);
    color: var(--text-color);
}

img {
    display: block;
}

button,
a,
summary {
    cursor: pointer;
}

:focus-visible {
    outline: 2px solid var(--accent-color);
    outline-offset: 4px;
}

[data-reveal] {
    opacity: 0;
    transform: translateY(26px);
    transition: opacity 1100ms ease, transform 1100ms ease;
}

[data-reveal].is-visible {
    opacity: 1;
    transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        animation-duration: 0.001ms !important;
        animation-iteration-count: 1 !important;
        scroll-behavior: auto !important;
        transition-duration: 0.001ms !important;
    }

    [data-reveal] {
        opacity: 1;
        transform: none;
    }
}

.snowflake {
    position: fixed;
    top: -10px;
    background: #fff;
    border-radius: 50%;
    pointer-events: none;
    z-index: 9999;
    opacity: 0.8;
    animation: fall linear infinite;
}

@keyframes fall {
    0% { transform: translateY(0) translateX(0); opacity: 0; }
    10% { opacity: 1; }
    90% { opacity: 1; }
    100% { transform: translateY(100vh) translateX(20px); opacity: 0; }
}