:root {
    --bg-color: #0f1115;
    --card-bg: #181b22;
    --border-color: #27272a;
    --text-primary: #f3f4f6;
    --text-secondary: #9ca3af;
    --accent: #38bdf8;
    --accent-hover: #0284c7;
    --max-width: 900px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    padding: 0 1.5rem 2rem 1.5rem;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
}

/* Navigation */
nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 0;
    border-bottom: 1px solid var(--border-color);
}

.logo {
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--text-primary);
    text-decoration: none;
    letter-spacing: -0.02em;
}

.nav-links {
    display: flex;
    gap: 1.5rem;
    list-style: none;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.2s;
}

.nav-links a:hover {
    color: var(--accent);
}

/* Hero Section (Center Aligned) */
header.hero {
    text-align: center;
    padding: 5rem 0 4rem 0;
    border-bottom: 1px solid var(--border-color);
}

.tagline-badge {
    display: inline-block;
    color: var(--accent);
    font-weight: 600;
    font-size: 0.9rem;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    margin-bottom: 0.75rem;
}

h1 {
    font-size: 3rem;
    font-weight: 800;
    letter-spacing: -0.05em;
    margin-bottom: 1rem;
    color: var(--text-primary);
    line-height: 1.2;
}

.subheadline {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto 2rem auto;
}

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

.btn {
    display: inline-block;
    background-color: var(--text-primary);
    color: var(--bg-color);
    padding: 0.75rem 1.5rem;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 600;
    transition: opacity 0.2s;
}

.btn:hover {
    opacity: 0.9;
}

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

.btn-secondary:hover {
    border-color: var(--accent);
    color: var(--accent);
    opacity: 1;
}

/* Sections (Left Aligned Layout) */
section {
    padding: 4rem 0;
    border-bottom: 1px solid var(--border-color);
    text-align: left;
}

section:last-of-type {
    border-bottom: none;
}

h2 {
    font-size: 1.8rem;
    margin-bottom: 0.5rem;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

.section-desc {
    color: var(--text-secondary);
    margin-bottom: 2rem;
    font-size: 1rem;
}

p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

p strong {
    color: var(--text-primary);
}

/* Grids & Cards */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: border-color 0.2s;
}

.card:hover {
    border-color: var(--accent);
}

.card h3 {
    font-size: 1.15rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.card .role {
    font-size: 0.85rem;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.card p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.card-link {
    color: var(--accent);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
}

.card-link:hover {
    text-decoration: underline;
}

/* Framework List */
.framework-list {
    list-style: none;
    margin-top: 1.5rem;
    display: grid;
    gap: 1.5rem;
}

.framework-list li {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.framework-list strong {
    color: var(--text-primary);
    display: block;
    margin-bottom: 0.25rem;
    font-size: 1.1rem;
}

.framework-list span {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Footer */
footer {
    padding-top: 3rem;
    color: var(--text-secondary);
    font-size: 0.85rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

@media (max-width: 600px) {
    h1 { font-size: 2.2rem; }
    header.hero { padding: 3rem 0; }
    footer { flex-direction: column; gap: 1rem; text-align: center; }
}