html {
    height: 100%;
}

body {
    font-family: Lexend, sans-serif;
    background-color: var(--bg-body);
    color: var(--text-primary);
    margin: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

header {
    background: linear-gradient(0deg, var(--bg-header-top), var(--bg-header-bottom));
    border-bottom: 4px solid var(--border-strong);
    box-shadow: 0px 10px 10px 0px var(--shadow-strong);
    position: sticky;
    top: 0;
    z-index: 999;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin: 1rem;
    padding: 0 10%;
}

.wiki-toc nav {
    display: block;
    margin: 0.25rem 0;
}

main {
    flex: 1;
}

hr {
    border: none;
    height: 4px;
    background-color: var(--border-strong);
    margin: 2rem 40%;
}

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

a:hover {
    color: var(--link-hover);
}

.hero p a,
.article-section a {
    color: var(--text-error-soft);
    font-weight: 600;
    text-decoration: underline;
    text-decoration-color: var(--border-strong);
    text-decoration-thickness: 2px;
    text-underline-offset: 0.18em;
    background: linear-gradient(
        180deg,
        transparent 0%,
        transparent 72%,
        var(--highlight-subtle) 72%,
        var(--highlight-subtle) 100%
    );
    transition: color 0.2s ease, text-decoration-color 0.2s ease, background 0.2s ease;
}

.hero p a:hover,
.hero p a:focus-visible,
.article-section a:hover,
.article-section a:focus-visible {
    color: var(--text-inverse);
    text-decoration-color: var(--text-inverse);
    background: linear-gradient(
        180deg,
        transparent 0%,
        transparent 64%,
        var(--highlight-soft) 64%,
        var(--highlight-soft) 100%
    );
}

footer {
    list-style: none;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 1rem;
    gap: 1rem;
    color: var(--footer-text);
    background-color: var(--footer-bg);
    box-shadow: 10px 0px 10px 10px var(--shadow-strong);
    border-top: 4px solid var(--footer-border);
}

footer li {
    margin: 0.333rem 0;
}

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

.footer-links {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.footer-links li {
    display: flex;
    align-items: center;
}

.footer-links li + li::before {
    content: "-";
    margin: 0 0.5rem;
    color: var(--footer-text);
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 2rem;
    margin: 0;
    padding: 1rem;
    flex-wrap: wrap;
}

.hero {
    text-align: center;
    padding: 2rem 1rem;
}

.content-section,
.widget-grid {
    display: flex;
    align-items: center;
    margin: 1rem 10%;
    padding: 0 2rem;
    gap: 1rem;
}

.widget-card {
    background-color: var(--bg-surface);
    border: 4px solid var(--border-strong);
    padding: 1rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    flex-wrap: wrap;
}

.widget-card img {
    max-width: 256px;
    height: auto;
    border: 4px solid var(--border-strong);
    background: linear-gradient(0deg, var(--bg-header-top), var(--bg-body));
}

.widgets {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.caption {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 0.5rem;
    text-align: center;
}

.caption a {
    color: var(--text-muted-strong);
}

.links-page {
    display: flex;
    flex-direction: row;
    align-items: flex-start;
    gap: 1rem;
    padding: 2rem 1rem;
    justify-content: center;
    margin: 0 auto;
    max-width: 1200px;
    flex-wrap: wrap;
}

.link-group {
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    align-items: center;
    flex: 1;
}

.link-group h3 {
    margin: 0 0 0.75rem;
}

.link-group ul {
    margin: 0;
    padding: 0;
    list-style: none;
    width: 100%;
}

.link-group li {
    list-style: none;
}

.link-group a {
    display: inline-block;
    width: 100%;
}

.announcement {
    background-color: var(--footer-bg);
    box-shadow: 10px 0px 10px 10px var(--shadow-strong);
    border-bottom: 4px solid var(--footer-border);
    color: var(--footer-text);
    text-align: center;
    padding: 0.5rem;
    z-index: 1000;
    position: relative;
}

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

.close-btn {
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--footer-text);
    font-size: 1.2rem;
    cursor: pointer;
    line-height: 1;
}

.article-section {
    margin: 1rem 10%;
    padding: 0;
}

.hamburger {
    display: none;
}

.link-group {
    padding: 0.5rem;
    width: 80%;
    background-color: var(--bg-surface);
    border: 4px solid var(--border-strong);
    box-shadow: 0 4px 10px 0px var(--shadow-strong);
}

.link-category {
    margin-top: 1.5rem;
    margin-bottom: 0.5rem;
    font-size: 1.3rem;
    text-align: center;
}

.link-list li {
    display: block;
    padding: 5px;
    margin: 0.25rem 0;
    text-align: center;
    background-color: var(--bg-body);
    border: 4px solid var(--border-strong);
}

/* ================================
   MOBILE OPTIMIZATION LAYER
   ================================ */
@media (max-width: 700px) {

    header {
        position: static;
    }

    nav {
        flex-direction: column;
        padding: 0 1rem;
        margin: 0.5rem 0;
        gap: 0.5rem;
    }

    .nav-links {
        display: none;
        flex-direction: column;
        align-items: center;
        gap: 1rem;
        padding: 1rem 0;
    }
    
    .nav-links.open {
        display: flex;
    }

    .hamburger {
        display: block;
        cursor: pointer;
        font-size: 1.8rem;
        color: var(--text-primary);
        background: none;
        border: none;
    }

    .content-section,
    .widget-grid,
    .article-section {
        margin: 1rem 0.5rem;
        padding: 0 1rem;
        flex-direction: column;
        text-align: center;
    }

    .widget-card img {
        max-width: 100%;
    }

    .links-page {
        flex-direction: column;
        align-items: center;
        padding: 1rem;
        gap: 2rem;
    }

    .link-group {
        width: 100%;
        max-width: 400px;
    }

    hr {
        margin: 2rem 20%;
    }

    body {
        overflow-x: hidden;
    }

    footer {
        flex-wrap: wrap;
        text-align: center;
        padding: 1rem 0.5rem;
        overflow-x: hidden;
    }

    .footer-links {
        display: flex !important;
        flex-direction: column !important;
        align-items: center !important;
        text-align: center !important;
        gap: 0.25rem;
    }

    .footer-links li + li::before {
        content: none !important;
    }

    .link-group {
        padding: 1rem;
        width: 80%;
    }

    .link-category {
        margin-top: 1.5rem;
        margin-bottom: 0.5rem;
        font-size: 1.5rem;
    }

    .link-list li {
        padding: 0.75rem 1rem;
    }
}