:root {
    --primary-color: #3498db;
    --secondary-color: #2c3e50;
    --font-serif-base: 'Noto Serif SC', 'Source Han Serif SC', 'Songti SC', 'STSong', 'SimSun', serif;
}

*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    min-height: 100%;
}

body {
    min-height: 100vh;
}

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

a {
    color: inherit;
    text-decoration: none;
}

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

.hidden {
    display: none !important;
}