*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-fa);
    margin: 0;
    background-color: var(--light-color);
    color: var(--text-color);
    transition: background-color 0.3s, color 0.3s;
    min-height: 100vh;
}

html[lang="en"] body,
body.lang-en {
    font-family: var(--font-en);
}

a {
    color: inherit;
}

img {
    max-width: 100%;
}

.container {
    max-width: 960px;
    margin: 0 auto;
    padding: 20px;
}

.page-wrap {
    padding-bottom: 80px;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(6px); }
    to { opacity: 1; transform: translateY(0); }
}

.loading {
    position: fixed;
    inset: 0;
    background: var(--light-color);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    transition: opacity 0.5s, visibility 0.5s;
}

.loading.hidden {
    opacity: 0;
    visibility: hidden;
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 5px solid #f3f3f3;
    border-top: 5px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.lazy-load {
    opacity: 0;
    transition: opacity 0.5s;
}

.lazy-load.loaded {
    opacity: 1;
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}