:root {
    --bg-color: #0d1117;
    --text-color: #c9d1d9;
    --primary-color: #2dba4e; /* GitHub Green-ish / Parrot Green */
    --secondary-color: #1f6feb;
    --accent-color: #a371f7;
    --surface-color: #161b22;
    --border-color: #30363d;
    --code-bg: #0d1117;
    --font-heading: 'Inter', system-ui, -apple-system, sans-serif;
    --font-body: 'Inter', system-ui, -apple-system, sans-serif;
    --max-width: 1200px;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-body);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    color: #ffffff;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
}

h1 { font-size: 3.5rem; letter-spacing: -0.05em; }
h2 { font-size: 2.5rem; letter-spacing: -0.03em; margin-top: 3rem; }
h3 { font-size: 1.5rem; margin-top: 1.5rem; }

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.2s;
}

a:hover {
    color: #4ac26b;
}

/* Layout */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.5rem;
}

section {
    padding: 4rem 0;
}

/* Header / Nav */
header {
    background: rgba(13, 17, 23, 0.8);
    backdrop-filter: blur(10px);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    color: var(--text-color);
    font-weight: 500;
}

.nav-links a:hover {
    color: #fff;
}

.github-btn {
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    padding: 0.5rem 1rem;
    border-radius: 6px;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: #fff !important;
    transition: all 0.2s;
}

.github-btn:hover {
    background-color: var(--border-color);
    border-color: var(--text-color);
}

/* Hero Section */
.hero {
    padding-top: 180px;
    padding-bottom: 100px;
    text-align: center;
    background: radial-gradient(circle at top right, rgba(45, 186, 78, 0.1), transparent 40%),
                radial-gradient(circle at bottom left, rgba(31, 111, 235, 0.1), transparent 40%);
}

.hero p.tagline {
    font-size: 1.5rem;
    color: #8b949e;
    max-width: 600px;
    margin: 1.5rem auto 2.5rem;
}

.cta-group {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.btn {
    display: inline-block;
    padding: 0.8rem 1.5rem;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s;
}

.btn:hover {
    transform: translateY(-2px);
    text-decoration: none;
}

.btn-primary {
    background-color: var(--primary-color);
    color: #fff;
}

.btn-primary:hover {
    background-color: #2c974b;
    color: #fff;
}

.btn-secondary {
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    color: var(--text-color);
}

.btn-secondary:hover {
    border-color: var(--text-color);
    color: #fff;
}

/* Features Grid */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.feature-card {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    padding: 2rem;
    border-radius: 12px;
    transition: transform 0.2s, border-color 0.2s;
}

.feature-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
}

.feature-icon {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

/* Code Block */
.code-wrapper {
    background: #0d1117;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    margin: 2rem 0;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
}

.code-header {
    background: var(--surface-color);
    padding: 0.8rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}
.dot.red { background: #ff5f56; }
.dot.yellow { background: #ffbd2e; }
.dot.green { background: #27c93f; }

pre {
    padding: 1.5rem;
    overflow-x: auto;
    font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
    font-size: 0.9rem;
}

/* Architecture */
.mermaid-wrapper {
    background: var(--surface-color);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    display: flex;
    justify-content: center;
}

/* Footer */
footer {
    border-top: 1px solid var(--border-color);
    padding: 3rem 0;
    margin-top: 4rem;
    text-align: center;
    color: #8b949e;
}

footer a {
    color: #8b949e;
    margin: 0 1rem;
}

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

/* Responsive */
@media (max-width: 768px) {
    h1 { font-size: 2.5rem; }
    .hero { padding-top: 140px; }
    .nav-links { display: none; } /* Simplified mobile nav for now */
}