/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f4f6f9;
}

/* Header */
header {
    background: linear-gradient(135deg, #6a11cb 0%, #2575fc 100%);
    color: white;
    text-align: center;
    padding: 2rem 1rem;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

header p {
    font-size: 1.1rem;
    opacity: 0.9;
}

/* Main Content */
main {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 1rem;
}

.hero {
    text-align: center;
    padding: 3rem 1.5rem;
    background: white;
    border-radius: 12px;
    box-shadow: 0 6px 15px rgba(0,0,0,0.1);
    margin-bottom: 2rem;
}

.hero h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: #2c3e50;
}

.hero p {
    font-size: 1.1rem;
    color: #7f8c8d;
    margin-bottom: 1.5rem;
}

#startBtn {
    background-color: #6a11cb;
    color: white;
    border: none;
    padding: 1rem 2rem;
    font-size: 1.1rem;
    border-radius: 50px;
    cursor: pointer;
    transition: background-color 0.3s ease;
    box-shadow: 0 4px 10px rgba(106, 17, 203, 0.3);
}

#startBtn:hover {
    background-color: #5a0fa5;
}

/* Features Grid */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.feature {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.08);
    text-align: center;
}

.feature h3 {
    color: #6a11cb;
    margin-bottom: 0.8rem;
    font-size: 1.3rem;
}

/* Demo Section */
.demo {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.08);
    text-align: center;
}

.demo h3 {
    color: #2c3e50;
    margin-bottom: 1rem;
}

#demoOutput {
    font-size: 1.2rem;
    color: #27ae60;
    font-weight: 500;
}

/* Responsive Adjustments */
@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }
    
    .hero h2 {
        font-size: 1.5rem;
    }
    
    .features {
        grid-template-columns: 1fr;
    }
}