/* CSS Custom Properties for Theming */
:root {
    /* Colors - Light Mode */
    --color-primary: #000000;
    --color-secondary: #333333;
    --color-accent: #3b82f6;
    --color-accent-hover: #2563eb;
    --color-background: #ffffff;
    --color-text: #333333;
    --color-text-light: #666666;
    --color-border: #e0e0e0;
    --color-hover: #f5f5f5;
    --particle-color: 59, 130, 246;
    
    /* Typography */
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --font-size-base: 16px;
    --font-size-small: 14px;
    --font-size-large: 18px;
    --font-size-xlarge: 24px;
    --font-size-hero: 48px;
    
    /* Spacing */
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 32px;
    --spacing-xl: 48px;
    --spacing-xxl: 64px;
    
    /* Layout */
    --nav-height: 60px;
    --max-width: 1200px;
    --border-radius: 4px;
    
    /* Transitions */
    --transition-speed: 0.3s;
}

/* Font Loading Optimization */
/* If custom fonts are added, use font-display: swap to prevent invisible text */
@font-face {
    /* Example for custom fonts:
    font-family: 'CustomFont';
    src: url('fonts/custom-font.woff2') format('woff2');
    font-display: swap;
    */
}

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

body {
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-background);
    position: relative;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Dark Mode */
body.dark-mode {
    --color-primary: #ffffff;
    --color-secondary: #cccccc;
    --color-accent: #60a5fa;
    --color-accent-hover: #3b82f6;
    --color-background: #0a0a0a;
    --color-text: #e0e0e0;
    --color-text-light: #999999;
    --color-border: #333333;
    --color-hover: #1a1a1a;
    --particle-color: 96, 165, 250;
}

/* Scroll Progress Bar */
.scroll-progress-bar {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-accent), var(--color-accent-hover));
    width: 0%;
    z-index: 9999;
    transition: width 0.1s ease-out;
}

/* Navigation */
.navigation {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background-color: var(--color-background);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    height: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo a {
    font-size: var(--font-size-large);
    font-weight: 600;
    color: var(--color-primary);
    text-decoration: none;
}

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

.nav-links a {
    color: var(--color-text);
    text-decoration: none;
    transition: color var(--transition-speed);
}

.nav-links a:hover {
    color: var(--color-accent);
}

/* Theme Toggle */
.theme-toggle {
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text);
    transition: color var(--transition-speed);
    margin-left: var(--spacing-md);
}

.theme-toggle:hover {
    color: var(--color-primary);
}

.theme-toggle .moon-icon {
    display: none;
}

body.dark-mode .theme-toggle .sun-icon {
    display: none;
}

body.dark-mode .theme-toggle .moon-icon {
    display: block;
}

/* Main Content */
main {
    margin-top: var(--nav-height);
}

/* Hero Section */
.hero {
    min-height: calc(100vh - var(--nav-height));
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xxl) var(--spacing-md);
    position: relative;
}

.hero-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 800px;
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.3s ease-out, transform 0.6s ease-out;
}

.hero-content.scrolled {
    transform: translateY(-20px);
}

.hero-title {
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-hero);
    font-weight: 700;
    color: var(--color-primary);
    position: relative;
    cursor: default;
}

body.dark-mode .hero-title {
    color: var(--color-primary);
}

.hero-tagline {
    font-size: var(--font-size-large);
    color: var(--color-text-light);
    transition: opacity 0.3s ease-in-out;
    min-height: 1.5em;
    margin-bottom: var(--spacing-md);
}

.quick-nav-chips {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
    justify-content: center;
}

.nav-chip {
    padding: var(--spacing-xs) var(--spacing-md);
    background-color: var(--color-hover);
    border: 1px solid var(--color-border);
    border-radius: 20px;
    font-size: var(--font-size-small);
    color: var(--color-text);
    text-decoration: none;
    transition: all var(--transition-speed);
}

.nav-chip:hover {
    background-color: var(--color-accent);
    color: var(--color-background);
    border-color: var(--color-accent);
    transform: translateY(-2px);
}

/* Scroll Down Indicator */
.scroll-down-indicator {
    position: absolute;
    bottom: var(--spacing-xl);
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background-color: var(--color-hover);
    border: 2px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-speed);
    animation: bounce 2s infinite;
    color: var(--color-primary);
    padding: 0;
    z-index: 3;
}

.scroll-down-indicator:hover {
    background-color: var(--color-accent);
    border-color: var(--color-accent);
    color: var(--color-background);
    transform: translateX(-50%) scale(1.1);
}

.scroll-down-indicator svg {
    width: 24px;
    height: 24px;
}

/* Hide scroll indicator when not at top */
.scroll-down-indicator.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    40% {
        transform: translateX(-50%) translateY(-10px);
    }
    60% {
        transform: translateX(-50%) translateY(-5px);
    }
}

/* Section Dividers */
section {
    position: relative;
}

section:not(.hero)::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80%;
    max-width: 600px;
    height: 1px;
    background: linear-gradient(to right, transparent, var(--color-border), transparent);
}

/* About Section */
.about {
    padding: var(--spacing-xxl) var(--spacing-md);
}

.about-container {
    max-width: var(--max-width);
    margin: 0 auto;
}

.about h2 {
    font-size: var(--font-size-xlarge);
    margin-bottom: var(--spacing-xl);
    text-align: center;
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
}

.about-text {
    font-size: var(--font-size-large);
    line-height: 1.8;
    color: var(--color-text);
    margin-bottom: var(--spacing-xxl);
    text-align: center;
}

.tech-stack {
    margin-top: var(--spacing-xxl);
}

.tech-stack h3 {
    font-size: var(--font-size-large);
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    text-align: center;
    color: var(--color-primary);
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--spacing-md);
    max-width: 600px;
    margin: 0 auto;
}

.tech-item {
    background-color: var(--color-hover);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    text-align: center;
    font-size: var(--font-size-base);
    color: var(--color-text);
    border: 1px solid var(--color-border);
    transition: all var(--transition-speed);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
}

.tech-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.tech-icon {
    filter: grayscale(0%);
    transition: filter var(--transition-speed);
}

body.dark-mode .tech-icon {
    filter: brightness(0) invert(1);
}

.tech-item:hover .tech-icon {
    filter: grayscale(0%) brightness(1.1);
}

/* Projects Section */
.projects {
    padding: var(--spacing-xxl) var(--spacing-md);
}

.projects-container {
    max-width: var(--max-width);
    margin: 0 auto;
}

.projects h2 {
    font-size: var(--font-size-xlarge);
    margin-bottom: var(--spacing-xl);
    text-align: center;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

/* Project Card Styles */
.project-card {
    background-color: var(--color-background);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    overflow: hidden;
    cursor: pointer;
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
    display: flex;
    flex-direction: column;
}

.project-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.project-card-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    background-color: var(--color-hover);
}

.project-card-content {
    padding: var(--spacing-md);
    flex: 1;
    display: flex;
    flex-direction: column;
}

.project-card-title {
    font-size: var(--font-size-large);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-primary);
}

.project-card-description {
    font-size: var(--font-size-base);
    color: var(--color-text-light);
    line-height: 1.5;
}

/* Contact Section */
.contact {
    padding: var(--spacing-xxl) var(--spacing-md);
    background-color: var(--color-hover);
}

.contact-container {
    max-width: var(--max-width);
    margin: 0 auto;
}

.contact h2 {
    font-size: var(--font-size-xlarge);
    margin-bottom: var(--spacing-xl);
    text-align: center;
}

.contact-content {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-lg);
}

.contact-email {
    font-size: var(--font-size-large);
    color: var(--color-primary);
    text-decoration: none;
    transition: opacity var(--transition-speed);
}

.contact-email:hover {
    opacity: 0.7;
}

.social-links {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    justify-content: center;
}

.social-link {
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--color-accent);
    color: var(--color-background);
    text-decoration: none;
    border-radius: var(--border-radius);
    font-size: var(--font-size-base);
    transition: all var(--transition-speed);
}

.social-link:hover {
    background-color: var(--color-accent-hover);
    transform: translateY(-2px);
}

/* Footer */
footer {
    padding: var(--spacing-lg);
    text-align: center;
    color: var(--color-text-light);
    font-size: var(--font-size-small);
}

/* Project Detail Modal */
.project-detail-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    padding: var(--spacing-md);
    overflow-y: auto;
}

.project-detail-content {
    background-color: var(--color-background);
    max-width: 800px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    padding: var(--spacing-xl);
    border-radius: var(--border-radius);
    position: relative;
}

.project-detail-close {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    background: none;
    border: none;
    font-size: 32px;
    line-height: 1;
    cursor: pointer;
    color: var(--color-text-light);
    transition: color var(--transition-speed);
    padding: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.project-detail-close:hover {
    color: var(--color-primary);
}

.project-detail-title {
    font-size: var(--font-size-xlarge);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--color-primary);
    padding-right: var(--spacing-xl);
}

.project-detail-image {
    width: 100%;
    height: auto;
    max-height: 400px;
    object-fit: cover;
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-md);
}

.project-detail-description {
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text);
    margin-bottom: var(--spacing-lg);
}

.project-detail-technologies {
    margin-bottom: var(--spacing-lg);
}

.project-detail-technologies h3 {
    font-size: var(--font-size-large);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-primary);
}

.project-detail-tech-list {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.project-detail-tech-list li {
    background-color: var(--color-hover);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    font-size: var(--font-size-small);
    color: var(--color-text);
}

.project-detail-links {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.project-detail-link {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    background-color: var(--color-accent);
    color: var(--color-background);
    text-decoration: none;
    border-radius: var(--border-radius);
    font-size: var(--font-size-base);
    transition: all var(--transition-speed);
}

.project-detail-link:hover {
    background-color: var(--color-accent-hover);
    transform: translateY(-2px);
}

/* Hamburger Menu */
.hamburger-menu {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 30px;
    height: 24px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 1001;
}

.hamburger-menu span {
    display: block;
    width: 100%;
    height: 3px;
    background-color: var(--color-primary);
    transition: all var(--transition-speed);
    border-radius: 2px;
}

.hamburger-menu.active span:nth-child(1) {
    transform: translateY(10.5px) rotate(45deg);
}

.hamburger-menu.active span:nth-child(2) {
    opacity: 0;
}

.hamburger-menu.active span:nth-child(3) {
    transform: translateY(-10.5px) rotate(-45deg);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .projects-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    :root {
        --font-size-hero: 32px;
        --font-size-xlarge: 20px;
    }
    
    /* Hamburger Menu - Show on mobile */
    .hamburger-menu {
        display: flex;
    }
    
    /* Navigation Links - Mobile Menu */
    .nav-links {
        position: fixed;
        top: var(--nav-height);
        left: 0;
        right: 0;
        background-color: var(--color-background);
        flex-direction: column;
        padding: var(--spacing-md);
        gap: var(--spacing-md);
        border-bottom: 1px solid var(--color-border);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: transform var(--transition-speed), opacity var(--transition-speed), visibility var(--transition-speed);
        box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    }
    
    .nav-links.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-links li {
        width: 100%;
        text-align: center;
    }
    
    .nav-links a {
        display: block;
        padding: var(--spacing-sm);
        font-size: var(--font-size-large);
    }
    
    /* Projects Grid - Single Column */
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    /* Images - Scale appropriately */
    .project-card-image,
    .project-detail-image,
    img {
        max-width: 100%;
        width: 100%;
        height: auto;
    }
    
    /* Project Detail Modal */
    .project-detail-content {
        padding: var(--spacing-md);
        max-height: 95vh;
    }
    
    .project-detail-title {
        font-size: var(--font-size-large);
    }
    
    .project-detail-links {
        flex-direction: column;
    }
    
    .project-detail-link {
        text-align: center;
    }
    
    /* Hero Section - Mobile adjustments */
    .hero {
        padding: var(--spacing-xl) var(--spacing-md);
    }
    
    .hero-title {
        font-size: var(--font-size-hero);
    }
    
    /* Scroll Down Indicator - Smaller on mobile */
    .scroll-down-indicator {
        width: 50px;
        height: 50px;
        bottom: var(--spacing-md);
    }
    
    .scroll-down-indicator svg {
        width: 20px;
        height: 20px;
    }
    
    /* Sections - Adjust padding */
    .projects,
    .contact,
    .about {
        padding: var(--spacing-xl) var(--spacing-md);
    }
    
    .tech-grid {
        grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    }
}