/* ===================================
   CSS CUSTOM PROPERTIES (VARIABLES)
   =================================== */
:root {
    /* Colors */
    --bg-color: #050505;
    --bg-secondary: #111;
    --text-color: #ffffff;
    --text-muted: #aaa;
    --text-light: #ccc;
    --overlay-color: rgba(0, 0, 0, 0.7);
    --nav-inactive: #666;
    --accent-color: #667eea;
    --accent-hover: #5568d3;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 5rem;
    --spacing-xl: 6rem;

    /* Layout */
    --max-width: 1000px;
    --max-width-wide: 1200px;
    --border-radius: 8px;
    --border-radius-sm: 6px;

    /* Transitions */
    --transition-fast: 0.3s;
    --transition-medium: 0.4s;
    --transition-slow: 0.8s;

    /* Typography */
    --font-primary: "Helvetica Neue", Helvetica, Arial, sans-serif;
    --font-size-xl: 2.5rem;
    --font-size-lg: 2rem;
    --font-size-md: 1.5rem;
    --font-size-sm: 0.9rem;
}

/* ===================================
   RESET & BASE STYLES
   =================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

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

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* Section Headings */
.section-heading {
    font-size: var(--font-size-lg);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    text-transform: uppercase;
    letter-spacing: 2px;
}

/* ===================================
   HEADER & NAVIGATION
   =================================== */
header {
    padding: var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: var(--max-width);
    margin: 0 auto;
    position: relative;
    z-index: 20;
}

h1 {
    font-size: 1.1rem;
    font-weight: 800;
    letter-spacing: 2px;
    text-transform: uppercase;
}

/* Desktop Navigation */
.desktop-nav {
    display: flex;
    gap: var(--spacing-md);
}

.desktop-nav a {
    color: var(--nav-inactive);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    transition: color var(--transition-fast);
}

.desktop-nav a:hover,
.desktop-nav a:focus {
    color: var(--text-color);
    outline: none;
}

.desktop-nav a.active {
    color: var(--text-color);
    position: relative;
}

.desktop-nav a.active::after {
    content: "";
    position: absolute;
    bottom: -8px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--text-color);
}

/* Mobile Hamburger Button */
.burger-btn {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 10px;
    z-index: 30;
}

.burger-icon,
.burger-icon::before,
.burger-icon::after {
    display: block;
    background-color: var(--text-color);
    height: 2px;
    width: 24px;
    transition: all var(--transition-fast);
    position: relative;
}

.burger-icon::before,
.burger-icon::after {
    content: "";
    position: absolute;
}

.burger-icon::before {
    top: -8px;
}

.burger-icon::after {
    top: 8px;
}

/* Mobile Menu Overlay */
.mobile-menu {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: var(--bg-color);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-md);
    transform: translateY(-100%);
    transition: transform var(--transition-medium) ease;
    z-index: 15;
}

.mobile-menu.active {
    transform: translateY(0);
}

.mobile-menu a {
    color: var(--text-color);
    font-size: 2rem;
    text-decoration: none;
    font-weight: 700;
    transition: opacity var(--transition-fast);
}

.mobile-menu a:hover,
.mobile-menu a:focus {
    opacity: 0.7;
    outline: none;
}

/* Burger Animation When Open */
body.nav-open .burger-icon {
    background: transparent;
}

body.nav-open .burger-icon::before {
    transform: rotate(45deg);
    top: 0;
}

body.nav-open .burger-icon::after {
    transform: rotate(-45deg);
    top: 0;
}

/* ===================================
   PORTFOLIO FEED LAYOUT
   =================================== */
#portfolio-feed {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--spacing-md) var(--spacing-sm) var(--spacing-xl)
        var(--spacing-sm);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

/* ===================================
   PROJECT CARDS
   =================================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.project-card {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    background-color: var(--bg-secondary);
    cursor: pointer;
    overflow: hidden;
    opacity: 0;
    animation: fadeInUp var(--transition-slow) ease-out forwards;
    border-radius: var(--border-radius-sm);
}

/* Focus state for keyboard navigation */
.project-card:focus {
    outline: 2px solid var(--text-color);
    outline-offset: 4px;
}

/* Media Wrapper for Images/GIFs */
.media-wrapper {
    width: 100%;
    height: 100%;
    position: relative;
}

.static-img,
.hover-gif {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: opacity 0.5s ease;
}

.hover-gif {
    opacity: 0;
    z-index: 1;
}

.static-img {
    opacity: 1;
    z-index: 2;
}

/* Hover Effect: Switch Image to GIF */
.project-card:hover .hover-gif,
.project-card:focus .hover-gif {
    opacity: 1;
}

.project-card:hover .static-img,
.project-card:focus .static-img {
    opacity: 0;
}

/* Text Overlay */
.project-info {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--overlay-color);
    z-index: 3;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    opacity: 0;
    transition: opacity var(--transition-medium) ease;
    backdrop-filter: blur(4px);
    padding: var(--spacing-md);
}

.project-card:hover .project-info,
.project-card:focus .project-info,
.project-card.show-info .project-info {
    opacity: 1;
}

.project-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
    text-align: center;
    transform: translateY(20px);
    transition: transform var(--transition-medium) ease;
}

.project-role {
    font-size: 0.9rem;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--text-light);
    transform: translateY(20px);
    transition: transform var(--transition-medium) ease 0.1s;
}

.project-card:hover .project-title,
.project-card:hover .project-role,
.project-card:focus .project-title,
.project-card:focus .project-role,
.project-card.show-info .project-title,
.project-card.show-info .project-role {
    transform: translateY(0);
}

/* ===================================
   LIGHTBOX / VIDEO MODAL
   =================================== */
#lightbox {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.95);
    z-index: 100;
    display: none;
    justify-content: center;
    align-items: center;
    padding: var(--spacing-md);
    opacity: 0;
    transition: opacity var(--transition-fast) ease;
}

#lightbox.visible {
    display: flex;
    opacity: 1;
}

.video-wrapper {
    width: 100%;
    max-width: 1200px;
    aspect-ratio: 16 / 9;
    background: #000;
    box-shadow: 0 0 50px rgba(0, 0, 0, 0.5);
    border-radius: var(--border-radius);
    overflow: hidden;
}

iframe {
    width: 100%;
    height: 100%;
    border: none;
}

.close-btn {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    color: var(--text-color);
    font-size: 3rem;
    cursor: pointer;
    background: none;
    border: none;
    line-height: 1;
    transition: opacity var(--transition-fast);
    z-index: 101;
}

.close-btn:hover,
.close-btn:focus {
    opacity: 0.7;
    outline: none;
}

/* ===================================
   LOADING STATE
   =================================== */
.loading {
    position: relative;
}

.loading::after {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    width: 40px;
    height: 40px;
    margin: -20px 0 0 -20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* ===================================
   HERO VIDEO SECTION
   =================================== */
.hero-section {
    position: relative;
    width: 100%;
    height: 100vh;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-video {
    position: absolute;
    top: 50%;
    left: 50%;
    min-width: 100%;
    min-height: 100%;
    width: auto;
    height: auto;
    transform: translate(-50%, -50%);
    object-fit: cover;
    z-index: 0;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.4);
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-content {
    text-align: center;
    z-index: 2;
    padding: var(--spacing-md);
    animation: fadeInUp var(--transition-slow) ease-out;
}

.hero-title {
    font-size: 4rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 4px;
    margin-bottom: var(--spacing-sm);
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
}

.hero-subtitle {
    font-size: 1.5rem;
    font-weight: 300;
    margin-bottom: var(--spacing-md);
    color: var(--text-light);
}

.hero-cta {
    display: inline-block;
    padding: 1rem 2.5rem;
    background: transparent;
    border: 2px solid var(--text-color);
    color: var(--text-color);
    text-decoration: none;
    text-transform: uppercase;
    font-weight: 600;
    letter-spacing: 2px;
    transition: all var(--transition-fast);
    margin-top: var(--spacing-sm);
}

.hero-cta:hover,
.hero-cta:focus {
    background: var(--text-color);
    color: var(--bg-color);
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(255, 255, 255, 0.1);
}

.scroll-indicator {
    position: absolute;
    bottom: var(--spacing-md);
    left: 50%;
    transform: translateX(-50%);
    background: none;
    border: none;
    cursor: pointer;
    z-index: 2;
    animation: bounce 2s infinite;
}

.scroll-arrow {
    display: block;
    width: 24px;
    height: 24px;
    border-left: 2px solid var(--text-color);
    border-bottom: 2px solid var(--text-color);
    transform: rotate(-45deg);
}

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

/* ===================================
   ABOUT SECTION
   =================================== */
.about-section {
    padding: var(--spacing-xl) var(--spacing-md);
    background: var(--bg-secondary);
}

.about-container {
    max-width: var(--max-width-wide);
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: var(--spacing-lg);
    align-items: center;
}

.about-image {
    width: 100%;
    aspect-ratio: 3 / 4;
    overflow: hidden;
    border-radius: var(--border-radius);
}

.about-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.about-image:hover img {
    transform: scale(1.05);
}

.about-content {
    color: var(--text-light);
}

.about-content p {
    margin-bottom: var(--spacing-md);
    font-size: 1.1rem;
    line-height: 1.8;
}

.about-skills {
    margin-top: var(--spacing-lg);
}

.about-skills h3 {
    font-size: 1.3rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-color);
}

.about-skills ul {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-sm);
    list-style: none;
}

.about-skills li {
    padding: var(--spacing-sm);
    background: var(--bg-color);
    border-radius: var(--border-radius-sm);
    border-left: 3px solid var(--accent-color);
}

/* ===================================
   CONTACT SECTION
   =================================== */
.contact-section {
    padding: var(--spacing-xl) var(--spacing-md);
    background: var(--bg-color);
}

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

.contact-intro {
    text-align: center;
    font-size: 1.2rem;
    color: var(--text-muted);
    margin-bottom: var(--spacing-lg);
}

.contact-form {
    margin-bottom: var(--spacing-lg);
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 1px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 1rem;
    background: var(--bg-secondary);
    border: 1px solid #333;
    border-radius: var(--border-radius-sm);
    color: var(--text-color);
    font-family: var(--font-primary);
    font-size: 1rem;
    transition: border-color var(--transition-fast);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-color);
}

.form-group textarea {
    resize: vertical;
    min-height: 150px;
}

.submit-btn {
    width: 100%;
    padding: 1.2rem;
    background: var(--text-color);
    color: var(--bg-color);
    border: none;
    border-radius: var(--border-radius-sm);
    font-size: 1rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 2px;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.submit-btn:hover,
.submit-btn:focus {
    background: var(--text-light);
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(255, 255, 255, 0.1);
}

.submit-btn:active {
    transform: translateY(0);
}

.submit-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.contact-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid #333;
}

.contact-item h3 {
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: var(--spacing-xs);
    color: var(--text-muted);
}

.contact-item a {
    color: var(--text-color);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.contact-item a:hover,
.contact-item a:focus {
    color: var(--accent-color);
}

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

/* Form Success/Error Messages */
.form-message {
    padding: var(--spacing-sm);
    border-radius: var(--border-radius-sm);
    margin-bottom: var(--spacing-md);
    text-align: center;
    font-weight: 600;
}

.form-message.success {
    background: rgba(46, 213, 115, 0.2);
    border: 1px solid #2ed573;
    color: #2ed573;
}

.form-message.error {
    background: rgba(255, 71, 87, 0.2);
    border: 1px solid #ff4757;
    color: #ff4757;
}

/* ===================================
   FOOTER
   =================================== */
footer {
    padding: var(--spacing-md);
    text-align: center;
    background: var(--bg-secondary);
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* ===================================
   RESPONSIVE DESIGN
   =================================== */
@media (max-width: 768px) {
    .desktop-nav {
        display: none;
    }

    .burger-btn {
        display: block;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .hero-cta {
        padding: 0.8rem 2rem;
        font-size: 0.9rem;
    }

    .about-container {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .about-image {
        max-width: 400px;
        margin: 0 auto;
    }

    .about-skills ul {
        grid-template-columns: 1fr;
    }

    .contact-info {
        grid-template-columns: 1fr;
    }

    .project-title {
        font-size: 1.5rem;
    }

    #portfolio-feed {
        gap: var(--spacing-md);
        padding-bottom: var(--spacing-lg);
    }

    .close-btn {
        font-size: 2.5rem;
        top: var(--spacing-sm);
        right: var(--spacing-sm);
    }
}

@media (max-width: 480px) {
    header {
        padding: var(--spacing-sm);
    }

    h1 {
        font-size: 0.9rem;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 0.9rem;
    }

    .section-heading {
        font-size: 1.5rem;
    }

    .about-content p {
        font-size: 1rem;
    }

    .project-title {
        font-size: 1.2rem;
    }

    #lightbox {
        padding: var(--spacing-sm);
    }
}

/* ===================================
   ACCESSIBILITY IMPROVEMENTS
   =================================== */
/* Skip to content link for keyboard users */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--text-color);
    color: var(--bg-color);
    padding: 8px;
    text-decoration: none;
    z-index: 100;
}

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

/* Reduce motion for users who prefer it */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}