/* Reset and 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: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

/* Navigation */
.navbar {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    padding: 1rem 2rem;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-brand h1 {
    color: #667eea;
    font-size: 1.5rem;
}

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

.nav-links a {
    text-decoration: none;
    color: #555;
    font-weight: 500;
    transition: color 0.3s ease;
    padding: 0.5rem 1rem;
    border-radius: 5px;
}

.nav-links a:hover,
.nav-links a.active {
    color: #667eea;
    background: rgba(102, 126, 234, 0.1);
}

/* Main content container */
main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    background: white;
    border-radius: 20px;
    margin-top: 2rem;
    margin-bottom: 2rem;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
}

/* Hero section */
.hero {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
    margin-bottom: 4rem;
    padding: 2rem 0;
}

.hero-content h2 {
    font-size: 2.5rem;
    color: #333;
    margin-bottom: 1rem;
}

.hero-content p {
    font-size: 1.2rem;
    color: #666;
    margin-bottom: 2rem;
}

.hero-image {
    text-align: center;
}

.hero-image img {
    max-width: 100%;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.broken-image {
    margin-top: 1rem;
    opacity: 0.5;
}

/* Button styles */
.btn {
    display: inline-block;
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: center;
    font-size: 1rem;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background: #f8f9fa;
    color: #667eea;
    border: 2px solid #667eea;
}

.btn-secondary:hover {
    background: #667eea;
    color: white;
}

.btn-outline {
    background: transparent;
    color: #667eea;
    border: 2px solid #667eea;
}

.btn-outline:hover {
    background: #667eea;
    color: white;
}

.btn-warning {
    background: #ffc107;
    color: #212529;
}

.btn-info {
    background: #17a2b8;
    color: white;
}

.btn-success {
    background: #28a745;
    color: white;
}

.btn-sm {
    padding: 8px 16px;
    font-size: 0.9rem;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
}

/* Feature grid */
.features {
    margin-bottom: 4rem;
}

.features h2 {
    text-align: center;
    margin-bottom: 3rem;
    font-size: 2rem;
    color: #333;
}

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

.feature-card {
    background: #f8f9fa;
    padding: 2rem;
    border-radius: 15px;
    text-align: center;
    transition: transform 0.3s ease;
    border: 1px solid #e9ecef;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

.feature-card h3 {
    margin-bottom: 1rem;
    color: #333;
}

.feature-card p {
    color: #666;
    margin-bottom: 1.5rem;
}

/* Dynamic content */
.dynamic-content {
    background: linear-gradient(135deg, #e3f2fd, #f3e5f5);
    padding: 2rem;
    border-radius: 15px;
    margin-bottom: 3rem;
    text-align: center;
}

.hidden {
    display: none;
}

.loading-demo {
    margin-top: 2rem;
}

.spinner {
    border: 4px solid #f3f3f3;
    border-top: 4px solid #667eea;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 1rem auto;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Testing helpers */
.testing-helpers {
    margin-bottom: 3rem;
}

.testing-helpers h2 {
    margin-bottom: 2rem;
    color: #333;
}

.utility-buttons {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.form-examples {
    background: #f8f9fa;
    padding: 2rem;
    border-radius: 10px;
}

.form-examples h3 {
    margin-bottom: 1rem;
    color: #333;
}

.form-group {
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.form-group label {
    font-weight: 500;
    min-width: 120px;
}

.form-group input,
.form-group select {
    padding: 8px 12px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 1rem;
}

.form-group input[type="checkbox"] {
    width: auto;
    padding: 0;
}

/* Social links */
.footer-content {
    text-align: center;
    margin-bottom: 2rem;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 1rem;
}

.social-link {
    padding: 0.5rem 1rem;
    background: #667eea;
    color: white;
    text-decoration: none;
    border-radius: 5px;
    transition: background 0.3s ease;
}

.social-link:hover {
    background: #5a6fd8;
}

/* Footer */
footer {
    text-align: center;
    padding: 2rem;
    background: rgba(255, 255, 255, 0.9);
    color: #666;
    border-radius: 10px;
    margin: 0 2rem 2rem 2rem;
}

/* Form styles for other pages */
.form-container {
    max-width: 500px;
    margin: 0 auto;
    background: #f8f9fa;
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.form-container h2 {
    text-align: center;
    margin-bottom: 2rem;
    color: #333;
}

.form-field {
    margin-bottom: 1.5rem;
}

.form-field label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: #333;
}

.form-field input,
.form-field textarea,
.form-field select {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-field input:focus,
.form-field textarea:focus,
.form-field select:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-field textarea {
    resize: vertical;
    min-height: 100px;
}

/* Product grid */
.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.product-card {
    background: white;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.product-card:hover {
    transform: translateY(-5px);
}

.product-image {
    width: 100%;
    height: 200px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 3rem;
}

.product-info {
    padding: 1.5rem;
}

.product-info h3 {
    margin-bottom: 0.5rem;
    color: #333;
}

.product-price {
    font-size: 1.2rem;
    font-weight: bold;
    color: #667eea;
    margin-bottom: 1rem;
}

/* Responsive design */
@media (max-width: 768px) {
    .navbar {
        flex-direction: column;
        gap: 1rem;
    }

    .nav-links {
        gap: 1rem;
    }

    .hero {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-content h2 {
        font-size: 2rem;
    }

    .utility-buttons {
        justify-content: center;
    }

    .form-group {
        flex-direction: column;
        align-items: flex-start;
    }

    .form-group label {
        min-width: auto;
    }
}