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

:root {
    --background: #1a1a1a;
    --card-bg: #222222;
    --card-bg-hovered: #2a2a2a;
    --border: #383838;
    --border-hovered: #474747;
    --title: #f0f0f0;
    --text: #dbdbdb;
    --subtext: #888888;
    --accent: #ff0000;
    --accent-dimmed: #e9161675;
}

html {
    background-color: var(--background);
    font-family: 'Instrument Sans', sans-serif;
    font-weight: 500;
    color: var(--text);
}

body {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

h1, h2, h3, h4, h5, h6 {
    color: var(--title);
}

img {
    display: block;
    user-select: none;
}

a {
    color: var(--text);
    text-decoration: none;
}

header {
    position: sticky;
    top: 0;
    background-color: var(--card-bg);
    backdrop-filter: blur(12px);
    border-bottom: var(--border) 2px solid;
    z-index: 999;
}

header .content {
    display: flex;
    align-items: center;
    margin: 0 auto;
    padding: 16px 0;
    max-width: 1500px;
}

header .content .title {
    font-size: 20px;
    color: var(--text);
    cursor: default;
}

header .content .title::selection {
    color: var(--accent);
}

header .content .title span {
    color: var(--subtext);
}

header .content .title span::selection {
    color: var(--accent-dimmed);
}

header nav {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: 24px;
    user-select: none;
}

header nav .link {
    font-size: 18px;
    color: var(--subtext);
    transition: color 0.2s ease;
}

header nav .link:hover {
    color: var(--text);
}

header nav .active {
    position: relative;
    font-size: 18px;
    color: var(--title);
}

header nav .active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--accent);
}

.section-title {
    font-size: 28px;
    user-select: none;
}

.section-desc {
    margin-top: 4px;
    font-weight: 400;
    font-size: 16px;
    color: var(--subtext);
    user-select: none;
}

.error-text {
    font-weight: 600;
    color: orange;
}

footer {
    margin-top: auto;
    user-select: none;
}

footer .content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin: 0 auto;
    padding: 16px 0;
    max-width: 1250px;
    font-size: 14px;
    color: var(--subtext);
}

footer .content .heart {
    vertical-align: middle;
    width: 16px;
    height: 16px;
    fill: #d82929;
}

footer .content a {
    color: var(--subtext);
    transition: color 0.3s ease;
}

footer .content a:hover {
    color: var(--text);
}

@media (max-width: 1060px) {
    header .content {
        padding: 16px 24px;
    }

    footer .content {
        padding: 16px 24px;
    }
}

@media (max-width: 768px) {
    header .content {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
        padding: 12px 16px;
    }

    header nav {
        position: static;
        transform: none;
        gap: 16px;
    }

    header nav .link,
    header nav .active {
        font-size: 16px;
    }

    footer .content {
        flex-direction: column;
        align-items: center;
        gap: 6px;
        padding: 12px 16px;
        text-align: center;
    }
}