:root {
    --color-primary: #66CC66;
    --color-primary-light: #7FE87F;
    --color-background-deep: #0d0d0d;
    --color-background: #1a1a1a;
    --color-surface-dark: #2a2a2a;
    --color-text: #e0e0e0;
    --color-text-secondary: #b0b0b0;
    --color-text-tertiary: #bdc3c7;
    --color-text-nav: #e1e8ed;
    --color-white-off: #f8f9fa;
    --color-white-bright: #f0f0f0;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-xxl: 5rem;
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --font-mono: 'Courier New', Consolas, Monaco, monospace;
    --max-width-content: 1200px;
    --max-width-text: 800px;
    --radius-sm: 4px;
    --radius-md: 8px;
    --transition: 0.2s ease;
    --shadow-focus: 0 0 0 3px var(--color-primary);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-background);
}

/* ACCESSIBILITY */
.skip-link {
    position: absolute;
    top: -100px;
    left: 0;
    z-index: 10000;
    padding: 0.5rem 1rem;
    background: var(--color-primary);
    color: var(--color-background);
    text-decoration: none;
    transition: top 0.3s ease;
}

.skip-link:focus {
    top: 0;
}

*:focus-visible {
    outline: 3px solid var(--color-primary);
    outline-offset: 3px;
}

.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
}

.navigation-bar {
    background-color: var(--color-background-deep);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.5);
}

.navigation-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: var(--max-width-content);
    margin: 0 auto;
    padding: var(--spacing-sm) var(--spacing-lg);
}

.navigation-brand a {
    font-family: var(--font-mono);
    font-size: 1.4rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    color: var(--color-white-off);
    text-decoration: none;
    transition: color var(--transition);
}

.navigation-brand a:hover {
    color: var(--color-primary);
}

.navigation-links {
    display: flex;
    gap: var(--spacing-lg);
    list-style: none;
}

.navigation-links a {
    position: relative;
    font-size: 1rem;
    color: var(--color-text-nav);
    text-decoration: none;
    transition: color var(--transition);
}

.navigation-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-primary);
    transition: width var(--transition);
}

.navigation-links a:hover {
    color: var(--color-primary);
}

.navigation-links a:hover::after {
    width: 100%;
}

#main-content {
    padding-top: 0;
}

.welcome-section {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: var(--spacing-lg);
    margin-top: 0;
    background: linear-gradient(135deg, var(--color-background) 0%, var(--color-surface-dark) 100%);
    background-image: 
        linear-gradient(135deg, var(--color-background) 0%, var(--color-surface-dark) 100%),
        repeating-linear-gradient(90deg, transparent, transparent 50px, rgba(102, 204, 102, 0.02) 50px, rgba(102, 204, 102, 0.02) 51px),
        repeating-linear-gradient(0deg, transparent, transparent 50px, rgba(102, 204, 102, 0.02) 50px, rgba(102, 204, 102, 0.02) 51px);
}

.welcome-content {
    position: relative;
    max-width: var(--max-width-text);
    text-align: center;
}

.welcome-content::before {
    content: '00:00:00';
    position: absolute;
    top: -40px;
    right: 20px;
    padding: var(--spacing-xs) var(--spacing-sm);
    background-color: rgba(13, 13, 13, 0.6);
    border: 2px solid var(--color-primary);
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
    font-size: 0.9rem;
    letter-spacing: 0.1em;
    color: var(--color-primary);
    animation: timer-pulse 2s ease-in-out infinite;
}

@keyframes timer-pulse {
    0%, 100% {
        opacity: 1;
        box-shadow: 0 0 5px rgba(102, 204, 102, 0.3);
    }
    50% {
        opacity: 0.85;
        box-shadow: 0 0 15px rgba(102, 204, 102, 0.5);
    }
}

.welcome-section h1 {
    margin-bottom: var(--spacing-sm);
    font-family: var(--font-mono);
    font-size: 3rem;
    font-weight: 700;
    letter-spacing: 0.02em;
    color: var(--color-white-bright);
}

.welcome-subtitle {
    font-size: 1.3rem;
    font-weight: 400;
    color: var(--color-text-secondary);
}

.projects-section {
    min-height: 100vh;
    padding: var(--spacing-xxl) var(--spacing-lg);
    background-color: var(--color-background-deep);
    background-image: repeating-linear-gradient(0deg, transparent, transparent 2px, rgba(102, 204, 102, 0.03) 2px, rgba(102, 204, 102, 0.03) 4px);
}

.projects-title {
    margin-bottom: var(--spacing-xl);
    font-family: var(--font-mono);
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: 0.03em;
    text-align: center;
    color: var(--color-white-off);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-lg);
    max-width: var(--max-width-content);
    margin: 0 auto;
}

.project-card {
    display: flex;
    flex-direction: column;
    background-color: var(--color-surface-dark);
    border-left: 4px solid var(--color-primary);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: border-left-color var(--transition);
}

.project-card:hover {
    border-left-color: var(--color-primary-light);
}

.project-image-link {
    display: block;
    position: relative;
    width: 100%;
    height: 220px;
    overflow: hidden;
    text-decoration: none;
}

.project-card-image {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    height: 100%;
    background-color: var(--color-background);
    transition: transform 0.4s ease;
}

/* Subtle vignette blur effect on image borders */
.project-card-image::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    pointer-events: none;
    box-shadow: inset 0 0 60px 20px rgba(13, 13, 13, 0.6);
    transition: box-shadow 0.4s ease;
}

.project-image-link:hover .project-card-image {
    transform: scale(1.08);
}

.project-image-link:hover .project-card-image::before {
    box-shadow: inset 0 0 0 0 rgba(13, 13, 13, 0);
}

.project-image-link:focus-visible {
    outline: 3px solid var(--color-primary);
    outline-offset: 3px;
}

.project-card-placeholder {
    font-family: var(--font-mono);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-primary);
}

.project-card-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
}

.project-card-title-link {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    width: fit-content;
    color: inherit;
    text-decoration: none;
    transition: color var(--transition), transform var(--transition);
}

.project-card-title-link:hover {
    color: var(--color-primary);
    transform: translateX(3px);
}

.project-card-title-link:focus-visible {
    outline: 3px solid var(--color-primary);
    outline-offset: 3px;
    border-radius: var(--radius-sm);
}

.github-icon {
    flex-shrink: 0;
    fill: currentColor;
    transition: fill var(--transition);
}

.project-card-title {
    margin: 0;
    font-family: var(--font-mono);
    font-size: 1.3rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    color: var(--color-white-off);
}

.project-card-description {
    font-size: 0.95rem;
    line-height: 1.5;
    color: var(--color-text-tertiary);
}

.project-demo-button {
    display: inline-block;
    width: fit-content;
    margin-top: var(--spacing-xs);
    padding: 0.6rem 1.4rem;
    background-color: var(--color-primary);
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
    font-size: 0.95rem;
    font-weight: 600;
    letter-spacing: 0.03em;
    color: var(--color-background-deep);
    text-decoration: none;
    transition: background-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.project-demo-button:hover {
    background-color: var(--color-primary-light);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102, 204, 102, 0.3);
}

.project-demo-button:focus-visible {
    outline: 3px solid var(--color-primary);
    outline-offset: 3px;
}

.site-footer {
    padding: var(--spacing-lg);
    background-color: var(--color-background-deep);
    color: var(--color-text-secondary);
    text-align: center;
    border-top: 1px solid var(--color-surface-dark);
}

/* MEDIA QUERIES */
@media screen and (max-width: 768px) {
    .navigation-container {
        flex-direction: column;
        gap: var(--spacing-sm);
        padding: var(--spacing-sm);
    }
    .navigation-links {
        gap: var(--spacing-sm);
    }
    .welcome-content::before {
        display: none;
    }
    .welcome-section h1 {
        font-size: 2.2rem;
    }
    .welcome-subtitle {
        font-size: 1.1rem;
    }
    .projects-title {
        font-size: 2rem;
    }
    .projects-grid {
        grid-template-columns: 1fr;
    }
}

@media screen and (max-width: 480px) {
    .navigation-container {
        padding: 0.8rem;
    }
    .navigation-brand a {
        font-size: 1.2rem;
    }
    .navigation-links {
        flex-wrap: wrap;
        justify-content: center;
        gap: 0.8rem;
    }
    .navigation-links a {
        font-size: 0.9rem;
    }
    .welcome-section {
        padding: var(--spacing-sm);
    }
    .welcome-section h1 {
        font-size: 1.8rem;
    }
    .welcome-subtitle {
        font-size: 1rem;
    }
    .projects-section {
        padding: var(--spacing-xl) var(--spacing-sm);
    }
    .projects-title {
        font-size: 1.8rem;
        margin-bottom: var(--spacing-lg);
    }
    .project-image-link {
        height: 180px;
    }
    .project-card-content {
        padding: var(--spacing-sm);
    }
    .project-card-title {
        font-size: 1.15rem;
    }
    .project-card-description {
        font-size: 0.9rem;
    }
    .project-demo-button {
        padding: 0.5rem 1.2rem;
        font-size: 0.9rem;
    }
}

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

}