/* CSS Custom Properties */
:root {
    --color-primary: #000;
    --color-text: #fff;
    --font-primary: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    --font-size-base: clamp(3.5rem, 8vw, 8rem);
    --font-size-link: clamp(1rem, 2.5vw, 1.2rem);
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --animation-duration: 0.3s;
    --animation-easing: ease;
}

/* Reset and base styles */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    height: 100%;
    overflow-x: hidden;
}

body {
    font-family: var(--font-primary);
    font-weight: 300;
    font-display: swap;
    color: var(--color-text);
    background: var(--color-primary);
    background-image: url('./assets/images/background.jpg');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-attachment: fixed;
}

/* Skip link for accessibility */
.skip-link {
    position: absolute;
    top: -40px;
    left: 6px;
    background: var(--color-text);
    color: var(--color-primary);
    padding: 8px;
    text-decoration: none;
    font-weight: 600;
    border-radius: 4px;
    z-index: 1000;
    transition: top var(--animation-duration) var(--animation-easing);
}

.skip-link:focus {
    top: 6px;
}

/* Main container */
main {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    position: relative;
}

.hero-section {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

.container {
    padding: var(--spacing-lg);
}

/* Accessibility - visually hidden but available to screen readers */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Main title styling */
.main-title {
    text-align: center;
    line-height: 0.9;
    font-size: var(--font-size-base);
    font-weight: 900;
    letter-spacing: -0.02em;
    margin: 5vh 0 0 0;
    display: flex;
    flex-direction: column;
    contain: layout;
}

.main-title div {
    opacity: 0;
    animation: fadeIn 1.2s var(--animation-easing) forwards;
    will-change: opacity;
}

.main-title div:nth-child(1) {
    animation-delay: 0.3s;
}

.main-title div:nth-child(2) {
    animation-delay: 0.9s;
}

.main-title div:nth-child(3) {
    animation-delay: 1.5s;
}

/* Animations */
@keyframes fadeIn {
    to {
        opacity: 1;
    }
}

/* Footer styles */
footer {
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
}

footer nav ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    align-items: center;
}

.footer-links a {
    color: var(--color-text);
    text-decoration: none;
    font-size: var(--font-size-link);
    font-weight: 500;
    position: relative;
    transition: border-bottom-color var(--animation-duration) var(--animation-easing);
    border-bottom: 1px solid transparent;
}

.footer-links a:where(:hover, :focus-visible) {
    border-bottom: 1px solid var(--color-text);
}

.footer-links a:focus-visible {
    outline: 2px solid var(--color-text);
    outline-offset: 4px;
    border-radius: 2px;
}

/* Social icons */
.social-links {
    justify-content: center;
    flex-direction: row !important;
    gap: var(--spacing-lg) !important;
}

.social-links a {
    color: var(--color-text);
    text-decoration: none;
    transition: opacity var(--animation-duration) var(--animation-easing), transform var(--animation-duration) var(--animation-easing);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    will-change: transform, opacity;
}

.social-links a:hover {
    opacity: 0.7;
    transform: translateY(-2px);
}

.social-links a:focus-visible {
    outline: 2px solid var(--color-text);
    outline-offset: 4px;
    border-radius: 4px;
}

.social-links img {
    width: 24px;
    height: 24px;
    filter: brightness(0) invert(1);
}

/* Responsive design */
@media (max-width: 768px) {
    .main-title {
        margin: 3vh 0 0 0;
    }
    
    .container {
        padding: var(--spacing-sm);
    }
    
    footer {
        padding: var(--spacing-md) var(--spacing-sm);
        gap: var(--spacing-sm);
    }
    
    footer nav ul {
        gap: var(--spacing-sm);
    }
    
    .footer-links {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .social-links {
        gap: var(--spacing-md) !important;
    }
}

@media (max-width: 480px) {
    footer nav ul {
        gap: 0.8rem;
    }
    
    .social-links {
        gap: var(--spacing-sm) !important;
    }
    
    .social-links a {
        width: 36px;
        height: 36px;
    }
    
    .social-links img {
        width: 20px;
        height: 20px;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    body {
        background-color: var(--color-primary);
    }
    
    .footer-links a:hover,
    .footer-links a:focus-visible {
        border-bottom: 2px solid var(--color-text);
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .main-title div {
        animation: none;
        opacity: 1;
    }
    
    .social-links a:hover {
        transform: none;
    }
}

/* High performance mode */
@media (prefers-reduced-data: no-preference) {
    body {
        background-attachment: fixed;
    }
}

/* Optimize for reduced data */
@media (prefers-reduced-data: reduce) {
    body {
        background-image: none;
        background-color: var(--color-primary);
    }
}

/* Print styles */
@media print {
    body {
        background: white;
        color: black;
    }
    
    .social-links img {
        filter: none;
    }
}