:root {
    --bg-color: #0f111a;
    --text-color: #e2e8f0;
    --accent-color: #3b82f6;
    --accent-hover: #60a5fa;
    --card-bg: #1e2133;
    --card-border: #2dd4bf;
    --transition-speed: 0.3s;
}

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

.app-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--card-border);
    letter-spacing: 1px;
}

nav ul {
    list-style: none;
    display: flex;
    gap: 20px;
    margin: 0;
    padding: 0;
}

nav a {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-speed) ease;
}

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

.hero {
    text-align: center;
    padding: 80px 0 60px;
    animation: fadeIn 1s ease-out;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 20px;
    background: linear-gradient(90deg, #3b82f6, #2dd4bf);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p {
    font-size: 1.2rem;
    color: #94a3b8;
    max-width: 600px;
    margin: 0 auto 40px;
}

.cta-button {
    background-color: var(--accent-color);
    color: white;
    border: none;
    padding: 12px 30px;
    font-size: 1.1rem;
    border-radius: 8px;
    cursor: pointer;
    transition: all var(--transition-speed) ease;
    box-shadow: 0 4px 14px 0 rgba(59, 130, 246, 0.39);
}

.cta-button:hover {
    background-color: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.23);
}

.module-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    padding: 40px 0;
}

.module-card {
    background-color: var(--card-bg);
    padding: 30px;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: all var(--transition-speed) ease;
    cursor: pointer;
}

.module-card:hover {
    transform: translateY(-5px);
    border-color: var(--card-border);
    box-shadow: 0 10px 30px -10px rgba(45, 212, 191, 0.3);
}

.module-card h3 {
    margin-top: 0;
    color: var(--text-color);
}

.module-card p {
    color: #94a3b8;
    margin-bottom: 0;
}

footer {
    text-align: center;
    padding: 40px 0;
    color: #64748b;
    font-size: 0.9rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    margin-top: 40px;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}