:root {
    --bg-dark: #0d1117;
    --bg-card: #161b22;
    --border-color: #30363d;
    --text-main: #c9d1d9;
    --text-muted: #8b949e;
    --accent-orange: #f0883e;
    --accent-blue: #58a6ff;
    --accent-green: #2ea44f;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-main);
    line-height: 1.6;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

header {
    padding: 40px 0;
    border-bottom: 1px solid var(--border-color);
    background: linear-gradient(180deg, #1f242c 0%, var(--bg-dark) 100%);
}

h1 { margin: 0; font-size: 2.2rem; color: #fff; }
.subtitle { margin: 10px 0 20px 0; color: var(--text-muted); font-size: 1.1rem; }

.badges { display: flex; gap: 10px; }
.badge {
    padding: 4px 10px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: bold;
    text-transform: uppercase;
}
.rust { background-color: rgba(240, 136, 62, 0.15); color: var(--accent-orange); border: 1px solid var(--accent-orange); }
.target { background-color: rgba(88, 166, 255, 0.15); color: var(--accent-blue); border: 1px solid var(--accent-blue); }
.dev { background-color: rgba(46, 164, 79, 0.15); color: var(--accent-green); border: 1px solid var(--accent-green); }

.playground-section { padding: 40px 0; }
.section-desc { color: var(--text-muted); margin-bottom: 30px; }

.playground-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

@media (max-width: 768px) {
    .playground-grid { grid-template-columns: 1fr; }
}

.card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    display: flex;
    flex-direction: column;
}

.editor-card { grid-row: span 2; }

.card-header {
    background-color: #21262d;
    padding: 10px 16px;
    font-size: 0.85rem;
    font-weight: 600;
    border-bottom: 1px solid var(--border-color);
    border-top-left-radius: 7px;
    border-top-right-radius: 7px;
}

textarea {
    background-color: transparent;
    border: none;
    color: #79c0ff;
    font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
    font-size: 0.95rem;
    padding: 16px;
    resize: none;
    min-height: 320px;
    outline: none;
    flex-grow: 1;
}

pre {
    margin: 0;
    padding: 16px;
    overflow-x: auto;
    font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
    font-size: 0.9rem;
}

#ast-output { color: #ff7b72; }
#hex-output { color: #7ee787; }

hr { border: 0; border-top: 1px solid var(--border-color); margin: 40px 0; }

.docs-section { padding-bottom: 60px; }
.docs-section h2 { color: #fff; }
.docs-section article { margin-bottom: 30px; }
.docs-section h3 { color: var(--accent-blue); font-size: 1.2rem; margin-bottom: 10px; }

footer {
    text-align: center;
    padding: 30px 0;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 0.85rem;
}
footer a { color: var(--accent-blue); text-decoration: none; }
footer a:hover { text-decoration: underline; }