:root {
    --primary-color: #00ff88;
    --bg-color: #0b0e14;
    --text-color: #e0e0e0;
    --header-bg: rgba(11, 14, 20, 0.95);
    --card-bg: #161b22;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding-top: 80px;
}

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

/* Header & Nav */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--header-bg);
    padding: 20px 0;
    z-index: 1000;
    border-bottom: 1px solid #30363d;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar-brand {
    font-weight: 800;
    font-size: 1.5rem;
    color: var(--primary-color);
    text-decoration: none;
    letter-spacing: 1px;
}

.navbar-nav {
    list-style: none;
    display: flex;
    gap: 25px;
    margin: 0;
    padding: 0;
}

.nav-link {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

.nav-link:hover, .nav-item.active .nav-link {
    color: var(--primary-color);
}

/* Content */
h1, h2, h3 {
    color: #fff;
}

h1 {
    font-size: 3rem;
    margin-bottom: 1.5rem;
}

h2 {
    font-size: 2rem;
    border-left: 4px solid var(--primary-color);
    padding-left: 15px;
    margin-top: 3rem;
}

.modular-section {
    padding: 60px 0;
    border-bottom: 1px solid #30363d;
}

.module-item {
    background: var(--card-bg);
    padding: 30px;
    border-radius: 8px;
    margin-bottom: 20px;
    border: 1px solid #30363d;
}

/* Footer */
footer {
    padding: 40px 0;
    text-align: center;
    border-top: 1px solid #30363d;
    margin-top: 60px;
    font-size: 0.9rem;
    color: #8b949e;
}

/* Utilities */
a {
    color: var(--primary-color);
}