:root {
    --bg-dark: #0f111a;
    --bg-card: #181b28;
    --primary: #4ade80; /* Hacker Green / Spring Boot Green */
    --text-main: #f1f5f9;
    --text-muted: #94a3b8;
    --border: #2a2e3f;
    --font-sans: 'Outfit', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
}

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

body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    font-family: var(--font-sans);
    line-height: 1.6;
}

a {
    text-decoration: none;
    color: inherit;
}

/* Navbar */
nav {
    border-bottom: 1px solid var(--border);
    background: rgba(15, 17, 26, 0.9);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: 1px;
}

.logo span {
    color: var(--primary);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-links a {
    color: var(--text-muted);
    font-weight: 600;
    transition: color 0.3s;
}

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

/* Hero */
.hero {
    max-width: 1100px;
    margin: 0 auto;
    padding: 100px 20px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: center;
}

.badge {
    display: inline-block;
    padding: 6px 14px;
    background: rgba(74, 222, 128, 0.1);
    color: var(--primary);
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 20px;
}

.hero-content h1 {
    font-size: 3.5rem;
    line-height: 1.1;
    margin-bottom: 20px;
}

.highlight {
    color: var(--primary);
}

.hero-content p {
    font-size: 1.1rem;
    color: var(--text-muted);
    margin-bottom: 40px;
}

.btn {
    display: inline-block;
    padding: 14px 30px;
    background: var(--text-main);
    color: var(--bg-dark);
    font-weight: 800;
    border-radius: 8px;
    transition: transform 0.3s;
}

.btn:hover {
    transform: translateY(-3px);
}

/* Code Window */
.code-window {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 20px 40px rgba(0,0,0,0.4);
}

.window-header {
    background: #000;
    padding: 12px 15px;
    display: flex;
    gap: 8px;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.red { background: #ff5f56; }
.yellow { background: #ffbd2e; }
.green { background: #27c93f; }

.window-body {
    padding: 20px;
    overflow-x: auto;
}

pre {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: #a6accd;
}

/* Articles */
.section {
    padding: 80px 20px;
    background: #0b0c13;
}

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

.section-title {
    font-size: 2rem;
    margin-bottom: 40px;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 30px;
    transition: transform 0.3s, border-color 0.3s;
}

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

.card-tag {
    font-size: 0.8rem;
    color: var(--primary);
    font-weight: 700;
    text-transform: uppercase;
    margin-bottom: 15px;
}

.card h3 {
    font-size: 1.4rem;
    margin-bottom: 15px;
}

.card p {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 25px;
}

.read-more {
    font-weight: 600;
    color: var(--text-main);
}

/* Footer */
footer {
    text-align: center;
    padding: 40px 20px;
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 0.9rem;
}

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