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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

.app-container {
    max-width: 1200px;
    margin: 0 auto;
    background: white;
    min-height: 100vh;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
}

/* Header Styles */
header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 2rem;
    text-align: center;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    font-weight: 600;
    letter-spacing: 2px;
    color: white;
}

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

/* Navigation Styles */
.navigation {
    display: flex;
    justify-content: center;
    gap: 0;
    background: #f8f9fa;
    padding: 0;
    border-bottom: 3px solid #667eea;
    flex-wrap: wrap;
}

.navigation button {
    background: #f8f9fa;
    border: none;
    padding: 1rem 2rem;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    color: #333;
    font-weight: 500;
    border-bottom: 3px solid transparent;
    margin-bottom: -3px;
}

.navigation button:hover {
    background: #e9ecef;
    border-bottom-color: #667eea;
}

.navigation button:active {
    background: #dee2e6;
}

/* Main Content Styles */
.home-view,
.philosophy-view,
.benefits-view,
.types-view {
    padding: 2rem;
    max-width: 900px;
    margin: 0 auto;
}

h1 {
    color: #667eea;
    margin-bottom: 1rem;
    font-size: 2.5rem;
    font-weight: 600;
}

h2 {
    color: #764ba2;
    margin-top: 2rem;
    margin-bottom: 1rem;
    font-size: 1.8rem;
    font-weight: 400;
}

h3 {
    color: #667eea;
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
    font-size: 1.3rem;
}

p {
    margin-bottom: 1rem;
    line-height: 1.8;
    font-size: 1.05rem;
}

.intro {
    background: #f8f9fa;
    padding: 1.5rem;
    border-radius: 8px;
    margin: 2rem 0;
    border-left: 4px solid #667eea;
}

section {
    margin: 2rem 0;
}

/* Lists */
ul {
    margin: 1rem 0;
    padding-left: 2rem;
}

li {
    margin: 0.5rem 0;
    line-height: 1.6;
}

/* Benefits Grid */
.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.benefit-card {
    background: #f8f9fa;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.benefit-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.15);
}

.benefit-card h3 {
    margin-top: 0;
    color: #764ba2;
}

/* Types Grid */
.types-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.type-card {
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
    padding: 1.5rem;
    border-radius: 8px;
    border: 1px solid #e9ecef;
    transition: all 0.3s ease;
}

.type-card:hover {
    border-color: #667eea;
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.2);
}

.type-card h3 {
    margin-top: 0;
    color: #667eea;
}

/* Footer Styles */
footer {
    background: #2d3748;
    color: white;
    text-align: center;
    padding: 2rem;
    margin-top: 3rem;
}

footer p {
    margin: 0.5rem 0;
    opacity: 0.8;
}

/* Images */
img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    margin: 1rem 0;
}

/* Responsive Design */
@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }

    .navigation {
        flex-direction: column;
    }

    .navigation button {
        width: 100%;
        text-align: center;
    }

    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.5rem;
    }

    .home-view,
    .philosophy-view,
    .benefits-view,
    .types-view {
        padding: 1rem;
    }
}