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

:root {
    --primary-color: #f38020;
    --secondary-color: #404040;
    --accent-color: #0051c3;
    --bg-color: #ffffff;
    --text-color: #333333;
    --card-bg: #f9f9f9;
    --border-radius: 12px;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 8px 16px rgba(0, 0, 0, 0.15);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    background: var(--bg-color);
    min-height: 100vh;
    box-shadow: 0 0 40px rgba(0, 0, 0, 0.1);
}

/* Header & Navigation */
header {
    background: var(--secondary-color);
    color: white;
    padding: 1rem 2rem;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow);
}

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

.logo {
    font-size: 1.5rem;
    font-weight: bold;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links a {
    color: white;
    text-decoration: none;
    transition: color 0.3s;
}

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

/* Hero Section */
.hero {
    text-align: center;
    padding: 5rem 2rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    animation: fadeInUp 0.8s ease-out;
}

.subtitle {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.9;
    animation: fadeInUp 0.8s ease-out 0.2s backwards;
}

.cta-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    animation: fadeInUp 0.8s ease-out 0.4s backwards;
}

/* Buttons */
.btn {
    padding: 0.875rem 2rem;
    font-size: 1rem;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all 0.3s;
    font-weight: 600;
}

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

.btn-primary:hover {
    background: #d67018;
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

.btn-secondary {
    background: transparent;
    color: white;
    border: 2px solid white;
}

.btn-secondary:hover {
    background: white;
    color: var(--secondary-color);
    transform: translateY(-2px);
}

/* Features Section */
.features {
    padding: 4rem 2rem;
}

.features h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: var(--secondary-color);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: var(--border-radius);
    text-align: center;
    transition: all 0.3s;
    border: 1px solid #e0e0e0;
}

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

.icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--secondary-color);
}

.feature-card p {
    color: #666;
}

/* Demo Section */
.demo {
    padding: 4rem 2rem;
    background: var(--card-bg);
}

.demo h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 2rem;
    color: var(--secondary-color);
}

.demo-box {
    max-width: 500px;
    margin: 0 auto 3rem;
    padding: 2rem;
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.demo-box input {
    width: 100%;
    padding: 1rem;
    font-size: 1rem;
    border: 2px solid #e0e0e0;
    border-radius: var(--border-radius);
    margin-bottom: 1rem;
    transition: border-color 0.3s;
}

.demo-box input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.greeting-message {
    margin-top: 1rem;
    font-size: 1.25rem;
    color: var(--accent-color);
    font-weight: 600;
    min-height: 2rem;
}

.stats {
    display: flex;
    gap: 2rem;
    justify-content: center;
    flex-wrap: wrap;
}

.stat-item {
    text-align: center;
    padding: 2rem;
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    min-width: 200px;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.stat-label {
    color: #666;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* Contact Section */
.contact {
    padding: 4rem 2rem;
    text-align: center;
}

.contact h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--secondary-color);
}

.tech-stack {
    margin-top: 1rem;
    padding: 1rem;
    background: var(--card-bg);
    border-radius: var(--border-radius);
    display: inline-block;
    font-family: 'Courier New', monospace;
    color: var(--accent-color);
}

/* Footer */
footer {
    background: var(--secondary-color);
    color: white;
    text-align: center;
    padding: 2rem;
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2rem;
    }
    
    .nav-links {
        gap: 1rem;
    }
    
    .cta-buttons {
        flex-direction: column;
    }
    
    .feature-grid {
        grid-template-columns: 1fr;
    }
}