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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans JP', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f7fa;
}

/* Container */
.container {
    max-width: 800px;
    margin: 0 auto;
    background-color: white;
    min-height: 100vh;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.05);
}

/* Header */
header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 3rem 2rem;
    text-align: center;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.app-name {
    font-size: 1.1rem;
    opacity: 0.9;
}

/* Main Content */
main {
    padding: 2rem;
}

section {
    margin-bottom: 2.5rem;
}

h2 {
    color: #2d3748;
    font-size: 1.8rem;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid #e2e8f0;
}

h3 {
    color: #4a5568;
    font-size: 1.3rem;
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
}

p {
    color: #4a5568;
    margin-bottom: 1rem;
    line-height: 1.8;
}

ul {
    padding-left: 2rem;
    margin-bottom: 1rem;
}

li {
    color: #4a5568;
    margin-bottom: 0.5rem;
    line-height: 1.8;
}

/* Special Elements */
.last-updated {
    color: #718096;
    font-size: 0.95rem;
    font-style: italic;
}

.contact-info {
    background-color: #f7fafc;
    padding: 1rem;
    border-left: 4px solid #667eea;
    font-family: monospace;
    font-size: 1rem;
}

/* Footer */
footer {
    background-color: #2d3748;
    color: #e2e8f0;
    text-align: center;
    padding: 2rem;
    margin-top: 3rem;
}

footer p {
    color: #e2e8f0;
    margin-bottom: 0;
    font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    header {
        padding: 2rem 1.5rem;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    main {
        padding: 1.5rem;
    }
    
    h2 {
        font-size: 1.5rem;
    }
    
    h3 {
        font-size: 1.2rem;
    }
}

@media (max-width: 480px) {
    header h1 {
        font-size: 1.75rem;
    }
    
    .app-name {
        font-size: 1rem;
    }
    
    main {
        padding: 1rem;
    }
    
    ul {
        padding-left: 1.5rem;
    }
}

/* Language Toggle */
.language-toggle {
    position: absolute;
    top: 1rem;
    right: 1rem;
    display: flex;
    gap: 0.5rem;
}

.lang-btn {
    background-color: rgba(255, 255, 255, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.4);
    color: white;
    padding: 0.5rem 1rem;
    cursor: pointer;
    border-radius: 4px;
    font-size: 0.9rem;
    transition: all 0.3s ease;
}

.lang-btn:hover {
    background-color: rgba(255, 255, 255, 0.3);
}

.lang-btn.active {
    background-color: white;
    color: #667eea;
    border-color: white;
}

/* Print Styles */
@media print {
    body {
        background-color: white;
    }
    
    .container {
        box-shadow: none;
    }
    
    header {
        background: none;
        color: black;
        border-bottom: 2px solid #333;
    }
    
    footer {
        background: none;
        color: black;
        border-top: 1px solid #333;
    }
    
    .language-toggle {
        display: none;
    }
}

/* Mobile adjustments for language toggle */
@media (max-width: 480px) {
    .language-toggle {
        position: static;
        justify-content: center;
        margin-bottom: 1rem;
    }
}