/* concengine.net - Muji Clean Functional */
/* Fonts: "DM Sans", "JetBrains Mono" (Google Fonts) */
/* Palette: #ffffff, #111827, #6b7280, #f3f4f6, #f9fafb, #2563eb */

:root {
    --bg: #ffffff;
    --text: #111827;
    --text-sec: #6b7280;
    --border: #f3f4f6;
    --code-bg: #f9fafb;
    --link: #2563eb;
}

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

body {
    background: var(--bg);
    color: var(--text);
    font-family: 'DM Sans', sans-serif;
    font-weight: 400;
    font-size: 17px;
    line-height: 1.8;
}

.container {
    max-width: 640px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Navigation */
.top-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.25rem 24px;
    max-width: 640px;
    margin: 0 auto;
}

.nav-brand {
    font-weight: 600;
    font-size: 1rem;
    color: var(--text);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.nav-link {
    font-size: 0.9rem;
    color: var(--text-sec);
    text-decoration: none;
}

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

.gh-icon {
    display: block;
}

/* Hero */
.hero {
    padding: 120px 0 0;
}

.hero-title {
    font-weight: 500;
    font-size: 2.5rem;
    color: var(--text);
    line-height: 1.2;
}

.hero-sub {
    font-size: 1.1rem;
    color: var(--text-sec);
    margin-top: 0.75rem;
}

/* Content Sections */
.content-section {
    margin-top: 80px;
}

.section-heading {
    font-weight: 500;
    font-size: 1.4rem;
    color: var(--text);
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border);
    margin-bottom: 1.5rem;
}

.body-text {
    margin-bottom: 1rem;
    color: var(--text);
}

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

.inline-code {
    font-family: 'JetBrains Mono', monospace;
    font-size: 14px;
    background: var(--code-bg);
    padding: 2px 6px;
    border-radius: 4px;
}

.code-block {
    background: var(--code-bg);
    padding: 16px;
    border-radius: 6px;
    overflow-x: auto;
    margin: 1.25rem 0;
}

.code-pre {
    font-family: 'JetBrains Mono', monospace;
    font-size: 14px;
    line-height: 1.7;
    color: var(--text);
    margin: 0;
    white-space: pre;
}

/* Footer */
.site-footer {
    margin-top: 120px;
    padding: 2rem 0;
    border-top: 1px solid var(--border);
}

.footer-links {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 0.75rem;
}

.footer-link {
    font-size: 0.85rem;
    color: var(--text-sec);
    text-decoration: none;
}

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

.footer-note {
    font-size: 0.8rem;
    color: var(--text-sec);
}

/* Fade In */
.fade-in {
    opacity: 0;
    transition: opacity 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
}

@media (max-width: 768px) {
    .hero {
        padding: 80px 0 0;
    }
    .content-section {
        margin-top: 60px;
    }
    .footer-links {
        flex-wrap: wrap;
    }
}