:root {
    --bg: #070b14;
    --card-bg: rgba(16, 24, 40, 0.85);
    --card-border: rgba(255, 255, 255, 0.08);
    --accent: #38bdf8;
    --accent-glow: rgba(56, 189, 248, 0.25);
    --text: #f8fafc;
    --text-muted: #94a3b8;
    --code-bg: #030712;
    --code-border: #1e293b;
    --tab-active-bg: rgba(56, 189, 248, 0.12);
    --tab-active-border: #38bdf8;
}

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

body {
    background-color: var(--bg);
    color: var(--text);
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    min-height: 100vh;
    background-image: 
        radial-gradient(ellipse 80% 50% at 50% -20%, rgba(56, 189, 248, 0.10), transparent),
        radial-gradient(ellipse 60% 40% at 100% 50%, rgba(129, 140, 248, 0.06), transparent);
    padding: 1rem 1.25rem 2.5rem;
}

.container {
    max-width: 1250px;
    margin: 0 auto;
}

/* ==========================================================================
   Unified Top Bar (Brand + Sub-Tabs + Return Link)
   ========================================================================== */
.top-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1.25rem;
    padding: 0.5rem 0 1.25rem;
    border-bottom: 1px solid var(--card-border);
    margin-bottom: 1.25rem;
    flex-wrap: wrap;
}

.brand-group {
    display: flex;
    align-items: center;
    gap: 0.65rem;
}

.brand-group .brand {
    font-weight: 700;
    color: #ffffff;
    text-decoration: none;
    font-size: 1.05rem;
    letter-spacing: -0.01em;
}

.brand-group .badge {
    font-size: 0.72rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    padding: 2px 7px;
    border-radius: 4px;
    background: rgba(56, 189, 248, 0.15);
    color: var(--accent);
    border: 1px solid rgba(56, 189, 248, 0.25);
}

.tabs-nav {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    align-items: center;
}

.tab-link {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 0.86rem;
    font-weight: 500;
    color: var(--text-muted);
    text-decoration: none;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--card-border);
    transition: all 0.15s ease;
}

.tab-link:hover {
    color: #ffffff;
    background: rgba(255, 255, 255, 0.06);
    border-color: rgba(255, 255, 255, 0.15);
}

.tab-link.active {
    color: var(--accent);
    background: var(--tab-active-bg);
    border-color: var(--tab-active-border);
    font-weight: 600;
}

.tab-badge {
    font-size: 0.72rem;
    padding: 1px 5px;
    border-radius: 4px;
    background: rgba(255, 255, 255, 0.08);
}

.tab-link.active .tab-badge {
    background: rgba(56, 189, 248, 0.2);
    color: #ffffff;
}

.top-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.back-to-docs {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.88rem;
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 6px 12px;
    border-radius: 6px;
    border: 1px solid rgba(255, 255, 255, 0.08);
    transition: all 0.15s ease;
}

.back-to-docs:hover {
    color: #ffffff;
    border-color: rgba(255, 255, 255, 0.2);
    background: rgba(255, 255, 255, 0.04);
}

/* ==========================================================================
   3-Column Interactive Live Panel
   ========================================================================== */
.live-panel {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 1.25rem;
    margin-bottom: 1.5rem;
}

.box {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 10px;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    backdrop-filter: blur(12px);
}

.box-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.65rem;
}

.box-title {
    font-size: 0.82rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--accent);
}

.btn-action {
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid var(--card-border);
    color: var(--text-muted);
    font-size: 0.72rem;
    font-weight: 600;
    padding: 0.25rem 0.55rem;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.15s ease;
}

.btn-action:hover {
    background: rgba(255, 255, 255, 0.12);
    color: #ffffff;
}

textarea, .output-pre {
    width: 100%;
    height: var(--editor-height, 240px);
    background: var(--code-bg);
    border: 1px solid var(--code-border);
    border-radius: 6px;
    padding: 0.85rem;
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    font-size: 0.82rem;
    line-height: 1.55;
    color: #e2e8f0;
    resize: vertical;
    overflow: auto;
}

/* Content-proportional editor heights per flavor */
body[data-flavor="simple"] textarea,
body[data-flavor="simple"] .output-pre {
    height: 185px;
}

body[data-flavor="nested"] textarea,
body[data-flavor="nested"] .output-pre {
    height: 240px;
}

body[data-flavor="array"] textarea,
body[data-flavor="array"] .output-pre {
    height: 285px;
}

body[data-flavor="advanced"] textarea,
body[data-flavor="advanced"] .output-pre {
    height: 330px;
}

textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 10px var(--accent-glow);
}

.output-pre {
    white-space: pre;
    margin: 0;
}

/* ==========================================================================
   Flavor Explanation Card
   ========================================================================== */
.flavor-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 10px;
    padding: 1rem 1.25rem;
    margin-bottom: 1.5rem;
}

.flavor-card h2 {
    font-size: 1.05rem;
    color: #ffffff;
    margin-bottom: 0.35rem;
}

.flavor-card p {
    font-size: 0.9rem;
    color: var(--text-muted);
    line-height: 1.5;
}

/* ==========================================================================
   Footer
   ========================================================================== */
footer {
    border-top: 1px solid var(--card-border);
    padding-top: 1.25rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    font-size: 0.85rem;
    color: var(--text-muted);
}

footer a {
    color: var(--accent);
    text-decoration: none;
    transition: opacity 0.15s;
}

footer a:hover {
    text-decoration: underline;
}

.footer-links {
    display: flex;
    gap: 1rem;
}

/* ==========================================================================
   Responsive Adaptations
   ========================================================================== */
@media (max-width: 900px) {
    .live-panel {
        grid-template-columns: 1fr;
    }

    textarea, .output-pre {
        height: 240px;
    }

    .top-bar {
        flex-direction: column;
        align-items: flex-start;
    }
}