:root {
    --bg-color: #fafafa;
    --text-color: #1a1a1a;
    --text-muted: #666666;
    --link-color: #0969da;
    --link-hover: #0550ae;
    --card-bg: #ffffff;
    --border-color: #e1e4e8;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #0d1117;
        --text-color: #e6edf3;
        --text-muted: #8b949e;
        --link-color: #58a6ff;
        --link-hover: #79b8ff;
        --card-bg: #161b22;
        --border-color: #30363d;
    }
}

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

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

body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.65;
    color: var(--text-color);
    background-color: var(--bg-color);
    margin: 0;
    padding: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    max-width: 680px;
    width: 100%;
    margin: 0 auto;
    padding: 2.5rem 1.25rem 2rem;
    flex: 1;
}

header {
    margin-bottom: 2rem;
}

.header-top {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 1rem;
}

.lang-switch {
    font-family: ui-monospace, SFMono-Regular, SF Mono, Menlo, Consolas, Liberation Mono, monospace;
    font-size: 0.85rem;
    color: var(--text-muted);
    user-select: none;
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
}

.lang-switch a {
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.15s ease;
}

.lang-switch a:hover {
    color: var(--link-color);
    text-decoration: none;
}

.lang-switch .active {
    color: var(--text-color);
    font-weight: 700;
}

.lang-switch .separator {
    color: var(--border-color);
    font-size: 0.8em;
}

.accent-dot {
    color: var(--link-color);
}

h1 {
    font-size: 1.85rem;
    font-weight: 700;
    margin: 0 0 0.35rem;
    letter-spacing: -0.02em;
}

.tagline {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin: 0 0 1.5rem;
}

h2 {
    font-size: 1.25rem;
    font-weight: 600;
    margin: 2rem 0 0.75rem;
    letter-spacing: -0.01em;
}

p {
    margin: 0 0 1rem;
}

a {
    color: var(--link-color);
    text-decoration: none;
    transition: color 0.15s ease, text-decoration-color 0.15s ease;
}

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

ul {
    margin: 0 0 1.25rem;
    padding-left: 1.4rem;
}

li {
    margin-bottom: 0.35rem;
}

code {
    font-family: ui-monospace, SFMono-Regular, SF Mono, Menlo, Consolas, Liberation Mono, monospace;
    font-size: 0.88em;
    color: inherit;
    background-color: var(--card-bg);
    padding: 0.15em 0.4em;
    border-radius: 4px;
    border: 1px solid var(--border-color);
}

/* Fediverse links list */
.link-list {
    list-style: none;
    padding: 0;
    margin: 1rem 0 2rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.link-list li a {
    display: flex;
    align-items: center;
    padding: 0.65rem 0.9rem;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-family: ui-monospace, SFMono-Regular, SF Mono, Menlo, Consolas, Liberation Mono, monospace;
    font-size: 0.92rem;
    color: var(--text-color);
    text-decoration: none;
    transition: border-color 0.15s ease, background-color 0.15s ease;
}

.link-list li a:hover {
    border-color: var(--link-color);
    color: var(--link-color);
    text-decoration: none;
}

/* Instance card */
.instance-card {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.9rem 1.1rem;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    text-decoration: none;
    transition: border-color 0.15s ease, background-color 0.15s ease;
    margin-bottom: 2rem;
}

.instance-card:hover {
    border-color: var(--link-color);
    text-decoration: none;
}

.instance-info {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.instance-host {
    font-family: ui-monospace, SFMono-Regular, SF Mono, Menlo, Consolas, Liberation Mono, monospace;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-color);
    transition: color 0.15s ease;
}

.instance-card:hover .instance-host {
    color: var(--link-color);
}

.instance-desc {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.instance-arrow {
    font-size: 1.1rem;
    color: var(--text-muted);
    transition: transform 0.15s ease, color 0.15s ease;
    padding-left: 0.5rem;
}

.instance-card:hover .instance-arrow {
    color: var(--link-color);
    transform: translateX(3px);
}

/* Page Navigation / Footer */
nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

nav a {
    font-size: 0.95rem;
    font-weight: 500;
}

footer {
    margin-top: 3rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 0.88rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1.25rem;
    flex-wrap: wrap;
}

.footer-links {
    display: flex;
    gap: 1.25rem;
}

.copyleft-icon {
    display: inline-block;
    transform: scaleX(-1);
}

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

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

.meta-info {
    color: var(--text-muted);
    font-size: 0.88rem;
    margin-top: 2rem;
}

/* leetgroup.org branding link */
.leetgroup-link {
    font-family: ui-monospace, SFMono-Regular, SF Mono, Menlo, Consolas, Liberation Mono, monospace;
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
}

.leetgroup-link .lg-prompt {
    color: #2ea043;
    font-weight: 700;
    transition: color 0.15s ease, text-shadow 0.15s ease;
}

@media (prefers-color-scheme: dark) {
    .leetgroup-link .lg-prompt {
        color: #3fb950;
    }
}

footer .leetgroup-link:hover {
    color: var(--text-color);
    text-decoration: none;
}

.leetgroup-link:hover .lg-prompt {
    color: #3fb950;
    text-shadow: 0 0 8px rgba(63, 185, 80, 0.5);
}