:root {
    --bg: #0a0a0a;
    --bg-card: #141414;
    --bg-code: #1a1a2e;
    --text: #e0e0e0;
    --text-muted: #888;
    --accent: #4fc3f7;
    --accent-hover: #81d4fa;
    --border: #2a2a2a;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --max-width: 800px;
}

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

body {
    font-family: var(--font-sans);
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

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

/* Nav */
.nav {
    border-bottom: 1px solid var(--border);
    padding: 1rem 2rem;
}
.nav-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.nav-logo {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text);
    font-family: var(--font-mono);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.nav-logo img { display: block; }
.nav-links { display: flex; gap: 1.5rem; }
.nav-links a { color: var(--text-muted); font-size: 0.95rem; }
.nav-links a:hover { color: var(--text); }
.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.25rem;
    flex-direction: column;
    gap: 5px;
}
.nav-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text);
    transition: transform 0.2s, opacity 0.2s;
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Content */
.content {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 2rem;
    flex: 1;
    width: 100%;
}
.content > h1 { margin-bottom: 1rem; }
.content > p { margin-bottom: 0.75rem; }
.content > pre { margin-bottom: 1.5rem; }

/* Hero */
.hero { text-align: center; padding: 4rem 0 3rem; }
.hero h1 {
    font-size: 3.5rem;
    font-weight: 800;
    font-family: var(--font-mono);
    background: linear-gradient(135deg, var(--accent), #b388ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero-tagline {
    font-size: 1.25rem;
    color: var(--text);
    margin-top: 1rem;
}
.hero-sub {
    color: var(--text-muted);
    margin-top: 0.5rem;
    font-size: 0.95rem;
}
.hero-buttons {
    margin-top: 2rem;
    display: flex;
    gap: 1rem;
    justify-content: center;
}
.btn {
    padding: 0.7rem 1.5rem;
    border-radius: 6px;
    font-size: 0.95rem;
    font-weight: 600;
    transition: all 0.2s;
}
.btn-primary {
    background: var(--accent);
    color: #000;
}
.btn-primary:hover { background: var(--accent-hover); color: #000; }
.btn-secondary {
    border: 1px solid var(--border);
    color: var(--text);
}
.btn-secondary:hover { border-color: var(--accent); color: var(--accent); }

/* Features */
.features { padding: 3rem 0; }
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.5rem;
}
.feature {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.5rem;
}
.feature h3 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
    color: var(--accent);
}
.feature p {
    font-size: 0.9rem;
    color: var(--text-muted);
    line-height: 1.5;
}

/* Code */
.quickstart { padding: 2rem 0; }
.quickstart h2 { margin-bottom: 1rem; }
pre {
    background: var(--bg-code);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.5rem;
    overflow-x: auto;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    line-height: 1.6;
}
code { font-family: var(--font-mono); font-size: 0.85rem; }
p code {
    background: var(--bg-code);
    padding: 0.15rem 0.4rem;
    border-radius: 3px;
}

/* Blog */
.recent-posts { padding: 2rem 0; }
.recent-posts h2 { margin-bottom: 1rem; }
.post-list { list-style: none; }
.post-list li {
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    flex-wrap: wrap;
    gap: 0.5rem;
}
.post-list time { color: var(--text-muted); font-size: 0.85rem; }
.post-summary { color: var(--text-muted); font-size: 0.9rem; width: 100%; }

/* Post */
.post header { margin-bottom: 2rem; }
.post h1 { font-size: 2rem; }
.post time { color: var(--text-muted); font-size: 0.9rem; }
.tags { margin-top: 0.5rem; display: flex; gap: 0.5rem; }
.tag {
    background: var(--bg-code);
    color: var(--accent);
    padding: 0.2rem 0.6rem;
    border-radius: 4px;
    font-size: 0.8rem;
}
.post-content h2 { margin: 2rem 0 0.75rem; font-size: 1.4rem; }
.post-content h3 { margin: 1.5rem 0 0.5rem; font-size: 1.15rem; }
.post-content p { margin-bottom: 1rem; }
.post-content ul, .post-content ol { margin: 0 0 1rem 1.5rem; }
.post-content li { margin-bottom: 0.3rem; }
.post-content pre { margin-bottom: 1.5rem; }
.post-content blockquote {
    border-left: 3px solid var(--accent);
    padding-left: 1rem;
    color: var(--text-muted);
    margin: 1rem 0;
}

/* Playground */
#citadel-playground {
    margin: 2rem 0 1rem;
}
.playground-status {
    padding: 0.6rem 1rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 6px 6px 0 0;
    font-size: 0.85rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.playground-status.ready { color: #66bb6a; }
.playground-status.ready::before { content: "\25cf"; }
.playground-status.error { color: #ef5350; }
.playground-status.error::before { content: "\25cf"; }
.playground-editor {
    border: 1px solid var(--border);
    border-top: none;
}
#sql-editor {
    width: 100%;
    background: var(--bg-code);
    color: var(--text);
    border: none;
    padding: 1rem;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    line-height: 1.5;
    resize: vertical;
    min-height: 120px;
    outline: none;
}
#sql-editor::placeholder { color: #555; }
.playground-buttons {
    display: flex;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--bg-card);
    border-top: 1px solid var(--border);
    align-items: center;
}
.playground-buttons button {
    padding: 0.4rem 1.2rem;
    background: var(--accent);
    color: #000;
    border: none;
    border-radius: 4px;
    font-weight: 600;
    font-size: 0.85rem;
    cursor: pointer;
    transition: background 0.2s;
}
.playground-buttons button:hover { background: var(--accent-hover); }
.playground-buttons button:disabled { opacity: 0.5; cursor: not-allowed; }
#clear-btn { background: var(--bg-code); color: var(--text-muted); border: 1px solid var(--border); }
#clear-btn:hover { color: var(--text); }
.playground-hint {
    margin-left: auto;
    font-size: 0.75rem;
    color: #555;
}
#sql-output {
    background: #0d0d1a;
    border: 1px solid var(--border);
    border-top: none;
    border-radius: 0 0 6px 6px;
    padding: 1rem;
    min-height: 80px;
    max-height: 60vh;
    overflow-y: auto;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: #8a8aaf;
    white-space: pre-wrap;
}
#sql-output:empty::before {
    content: "Output will appear here...";
    color: #333;
}

/* Footer */
.footer {
    padding: 1.5rem 2rem;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* Responsive */
@media (max-width: 640px) {
    .hero h1 { font-size: 2.5rem; }
    .hero-buttons { flex-direction: column; align-items: center; }
    .nav { padding: 0.75rem 1rem; }
    .nav-inner { flex-wrap: wrap; }
    .nav-toggle { display: flex; }
    .nav-links {
        display: none;
        width: 100%;
        flex-direction: column;
        gap: 0;
        padding-top: 0.75rem;
    }
    .nav-links.open { display: flex; }
    .nav-links a {
        padding: 0.6rem 0;
        font-size: 1rem;
        border-top: 1px solid var(--border);
    }
    .content { padding: 1.5rem 1rem; }
    .post-list li { flex-direction: column; }
    .playground-hint { display: none; }
    #sql-editor { min-height: 80px; font-size: 0.8rem; }
    .playground-status { font-size: 0.8rem; }
    #sql-output { font-size: 0.75rem; max-height: 50vh; }
    pre { font-size: 0.75rem; padding: 1rem; }
    pre, pre code, pre code span { white-space: pre-wrap !important; word-break: break-all !important; }
}