/* Main CSS - Professional color scheme */
:root {
    --primary-color: #2c3e50;
    --secondary-color: #ecf0f1;
    --accent-color: #3498db;
    --background-color: #ffffff;
    --text-color: #2c3e50;
    --light-gray: #f8f9fa;
    --border-color: #dee2e6;
    --success-color: #27ae60;
    --warning-color: #f39c12;
    --error-color: #e74c3c;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
}

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

/* Header */
.header {
    background-color: var(--primary-color);
    color: white;
    padding: 2rem 0;
    text-align: center;
}

.header-title {
    font-size: 1.6rem;
    font-weight: 300;
    margin-bottom: 0;
    margin-right: 0;
}

/* Main Content */
.main-content {
    padding: 3rem 0;
    min-height: calc(100vh - 200px);
}

/* Demo Grid */
.demo-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

/* Demo Cards */
.demo-card {
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid var(--border-color);
}

.demo-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

.demo-card-header {
    padding: 1.5rem;
    background-color: var(--light-gray);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.demo-title {
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--primary-color);
}

.demo-status {
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
    background-color: var(--success-color);
    color: white;
}

.demo-status.coming-soon {
    background-color: var(--warning-color);
}

.demo-card-body {
    padding: 1.5rem;
}

.demo-description {
    margin-bottom: 1rem;
    line-height: 1.6;
    color: #666;
}

.demo-features {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.feature-tag {
    background-color: var(--accent-color);
    color: white;
    padding: 0.3rem 0.8rem;
    border-radius: 15px;
    font-size: 0.8rem;
    font-weight: 500;
}

.demo-card-footer {
    padding: 1.5rem;
    background-color: var(--light-gray);
    border-top: 1px solid var(--border-color);
}

/* Buttons */
.btn {
    padding: 0.8rem 1.5rem;
    border: none;
    border-radius: 5px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
    text-align: center;
    width: 100%;
}

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

.btn-primary:hover:not(:disabled) {
    background-color: #34495e;
    transform: translateY(-2px);
}

.btn-secondary {
    background-color: var(--secondary-color);
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* Footer */
.footer {
    background-color: var(--primary-color);
    color: white;
    text-align: center;
    padding: 1.5rem 0;
    margin-top: auto;
}

/* Responsive Design */
@media (max-width: 768px) {
    .demo-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .header-title {
        font-size: 2rem;
    }
    
    .container {
        padding: 0 15px;
    }
}