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

:root {
    /* Modern Color Palette */
    --primary-color: #3b82f6;
    --primary-light: #60a5fa;
    --primary-dark: #1d4ed8;
    --secondary-color: #10b981;
    --accent-color: #f59e0b;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --background: #ffffff;
    --surface: #f8fafc;
    --border: #e5e7eb;
    
    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --font-size-base: 16px;
    --line-height-base: 1.6;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    color: var(--text-primary);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
}

.container {
    width: 100%;
    max-width: 600px;
    margin: 0 auto;
}

.content {
    background: var(--background);
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    text-align: center;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.icon-wrapper {
    margin-bottom: var(--spacing-lg);
}

.hello-icon {
    width: 64px;
    height: 64px;
    color: var(--primary-color);
    stroke-width: 1.5;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
}

h1 {
    font-size: 3rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

p {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
    max-width: 400px;
    margin-left: auto;
    margin-right: auto;
}

.features {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
    margin-top: var(--spacing-xl);
}

.feature {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--surface);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    transition: all 0.3s ease;
    cursor: default;
}

.feature:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-light);
}

.feature i {
    width: 20px;
    height: 20px;
    color: var(--primary-color);
    stroke-width: 2;
}

.feature span {
    font-weight: 500;
    color: var(--text-primary);
    font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .content {
        padding: var(--spacing-lg);
    }
    
    h1 {
        font-size: 2.5rem;
    }
    
    p {
        font-size: 1.1rem;
    }
    
    .features {
        flex-direction: column;
        align-items: center;
        gap: var(--spacing-sm);
    }
    
    .feature {
        width: 100%;
        max-width: 200px;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    body {
        padding: var(--spacing-sm);
    }
    
    .content {
        padding: var(--spacing-md);
    }
    
    h1 {
        font-size: 2rem;
    }
    
    .hello-icon {
        width: 48px;
        height: 48px;
    }
}

/* Print Styles */
@media print {
    body {
        background: white;
        color: black;
    }
    
    .content {
        box-shadow: none;
        border: 1px solid #ccc;
    }
    
    .hello-icon {
        color: #333;
    }
    
    h1 {
        color: #333;
        -webkit-text-fill-color: #333;
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    .hello-icon {
        animation: none;
    }
    
    .feature {
        transition: none;
    }
    
    .content {
        transition: none;
    }
}

/* Focus styles for accessibility */
.feature:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}