/* Optimized CSS for maximum performance */
:root {
    --primary: #FF6B6B;
    --secondary: #4ECDC4;
    --dark: #2E3440;
    --light: #FFF;
    --bg: #F7F7F7;
    --radius: 12px;
    --max-w: 1000px;
    --shadow: 0 8px 30px rgba(0,0,0,0.12);
    --transition: all 0.3s ease;
}

/* Base styles with system fonts fallback */
body, html {
    height: 100%;
    margin: 0;
    padding: 0;
    font-family: 'Roboto', system-ui, -apple-system, sans-serif;
    background: var(--bg);
    color: var(--dark);
    display: flex;
    flex-direction: column;
    line-height: 1.6;
    font-display: swap;
}

/* Header optimization */
.header {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: var(--light);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    will-change: transform;
}

.header h1 {
    font-weight: 700;
    margin: 0;
    font-size: 1.25rem;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.1);
}

/* Main content optimization */
#app {
    max-width: var(--max-w);
    width: 100%;
    margin: 0 auto;
    flex: 1;
    padding: 5rem 1rem 1rem;
    contain: layout style;
}

.page {
    background: var(--light);
    padding: 2rem;
    box-shadow: var(--shadow);
    border-radius: var(--radius);
    margin: 1rem 0;
    contain: layout;
}

.page h1 {
    font-size: clamp(1.5rem, 4vw, 2.5rem);
    margin-bottom: 2rem;
    color: var(--dark);
    text-align: center;
    font-weight: 700;
}

.page h2 {
    font-size: clamp(1.2rem, 3vw, 1.8rem);
    margin: 2rem 0 1rem;
    color: var(--dark);
    font-weight: 600;
}

.lead {
    font-size: clamp(1rem, 2.5vw, 1.25rem);
    color: #666;
    line-height: 1.8;
    margin-bottom: 2rem;
}

/* List optimization */
.list-group {
    list-style: none;
    padding: 0;
    margin: 2rem 0;
}

.list-group-item {
    background: transparent;
    border: none;
    padding: 1rem 1.5rem;
    margin-bottom: 0.75rem;
    border-radius: var(--radius);
    transition: var(--transition);
    border-left: 4px solid transparent;
    will-change: transform;
}

.list-group-item:hover {
    background: rgba(255, 107, 107, 0.1);
    border-left-color: var(--primary);
    transform: translateX(5px);
}

/* Image container optimization */
.image-container {
    display: flex;
    justify-content: center;
    margin: 2rem 0;
    contain: layout;
}

.image-container img {
    width: 250px !important;
    height: 250px !important;
    max-width: 250px !important;
    max-height: 250px !important;
    aspect-ratio: 1/1;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
    will-change: transform;
    object-fit: cover;
}

.image-container img:hover {
    transform: scale(1.02);
}

/* Footer optimization */
.footer {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: var(--light);
    padding: 2rem;
    text-align: center;
    box-shadow: var(--shadow);
    margin-top: auto;
}

.footer p {
    margin: 0 0 1rem;
    font-size: 0.9rem;
}

.footer a,
.btn-outline {
    color: var(--light);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border: 2px solid var(--light);
    border-radius: var(--radius);
    transition: var(--transition);
    display: inline-block;
}

.footer a:hover,
.btn-outline:hover {
    background: var(--light);
    color: var(--primary);
}

/* Container optimization */
.container {
    width: 100%;
    padding: 0 15px;
    margin: 0 auto;
    max-width: var(--max-w);
}

/* Links */
a {
    color: var(--primary);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--secondary);
    text-decoration: underline;
}

/* Disclaimer text */
.disclaimer {
    font-style: italic;
    font-size: 0.85rem;
    color: #666;
    margin-top: 1rem;
}

/* Mobile-first responsive design */
@media (max-width: 300px) {
    .header {
        padding: 1rem;
    }
    
    .header h1 {
        font-size: 1.1rem;
    }
    
    #app {
        padding: 4.5rem 0.5rem 0.5rem;
    }
    
    .page {
        padding: 1.5rem;
        margin: 0.5rem 0;
    }
    
    .container {
        padding: 0 10px;
    }
    
    .list-group-item {
        padding: 0.75rem 1rem;
        font-size: 0.95rem;
    }
    
    .image-container {
        margin: 1.5rem 0;
    }
    
    .image-container img {
        max-width: 90%;
    }
    
    .footer {
        padding: 1.5rem;
        font-size: 0.9rem;
    }
}

@media (max-width: 300px) {
    #app {
        padding: 4rem 0.3rem 0.3rem;
    }
    
    .container {
        padding: 0 5px;
    }
    
    .page {
        padding: 1rem;
    }
    
    .page h1 {
        text-align: left;
    }
    
    .page h2 {
        text-align: left;
    }
    
    .list-group-item {
        padding: 0.6rem 0.8rem;
        margin-bottom: 0.5rem;
        font-size: 0.9rem;
    }
    
    .list-group-item:hover {
        transform: none;
    }
    
    .header {
        padding: 1rem;
    }
    
    .image-container img {
        max-width: 100%;
    }
    
    .footer {
        padding: 1rem;
        font-size: 0.8rem;
    }
    
    p {
        font-size: 0.9rem;
    }
}

/* Performance optimizations */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Print styles */
@media print {
    .header,
    .footer {
        display: none;
    }
    
    .page {
        box-shadow: none;
        margin: 0;
        padding: 1rem;
    }
    
    a {
        color: inherit;
        text-decoration: underline;
    }
}