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

:root {
    /* Light Theme Colors - Pure black & white with grey accents */
    --primary-color: #1a1a1a;        /* dark grey for primary elements */
    --secondary-color: #4a4a4a;      /* medium grey for hover states */
    --text-primary: #1a1a1a;
    --text-secondary: #4a4a4a;
    --text-light: #767676;
    --bg-primary: #ffffff;
    --bg-secondary: #f5f5f5;
    --bg-dark: #0a0a0a;
    --border-color: #e0e0e0;
    --btn-text: #ffffff;              /* text on dark buttons */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
    
    /* Typography */
    --font-heading: 'Poppins', sans-serif;
    --font-subheading: 'Montserrat', sans-serif;
    --font-body: 'Open Sans', sans-serif;
    --font-mono: 'Space Mono', monospace;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    
    /* RGB variants for transparency */
    --bg-primary-rgb: 255, 255, 255;
}

/* Dark Theme Variables - Pure black & white with grey accents */
body.dark {
    --primary-color: #f0f0f0;        /* light grey for primary elements */
    --secondary-color: #b0b0b0;      /* medium light grey for hover */
    --text-primary: #f0f0f0;
    --text-secondary: #b0b0b0;
    --text-light: #888888;
    --bg-primary: #000000;
    --bg-secondary: #0a0a0a;
    --bg-dark: #000000;
    --border-color: #2a2a2a;
    --btn-text: #000000;              /* text on light buttons */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.6);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.7);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.8);
    --bg-primary-rgb: 0, 0, 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.7;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    overflow-x: hidden;
    transition: background-color var(--transition-slow), color var(--transition-slow);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.section {
    padding: var(--spacing-xl) 0;
}

/* ===========================
   Typography
   =========================== */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 600;
    line-height: 1.2;
    color: var(--text-primary);
}

.section-label {
    font-family: var(--font-subheading);
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--primary-color);
    display: inline-block;
    margin-bottom: var(--spacing-sm);
}

.section-title {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-lg);
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

/* ===========================
   Navigation
   =========================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(var(--bg-primary-rgb), 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: all var(--transition-base);
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
}

.nav-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 0;
}

.logo {
    font-family: 'Comic Neue', cursive;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
    letter-spacing: 0.5px;
}

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

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2.5rem;
}

.nav-link {
    font-family: var(--font-subheading);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-decoration: none;
    position: relative;
    transition: color var(--transition-fast);
}

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

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.menu-toggle span {
    width: 25px;
    height: 2px;
    background-color: var(--text-primary);
    transition: all var(--transition-base);
}

/* Theme Toggle Button */
.theme-toggle {
    background: none;
    border: none;
    cursor: pointer;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    transition: all var(--transition-base);
    margin-left: 1rem;
}

.theme-toggle:hover {
    transform: scale(1.1);
    background-color: var(--primary-color);
    color: var(--btn-text);
}

/* ===========================
   Hero Section
   =========================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding-top: 80px;
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
}

.hero-content {
    text-align: center;
    padding: var(--spacing-lg) 0;
}

.greeting {
    font-family: var(--font-subheading);
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.hero-title {
    font-family: var(--font-mono);
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
    /* Removed gradient, use solid color */
}

.hero-subtitle {
    font-family: var(--font-mono);
    font-size: clamp(1.25rem, 3vw, 1.75rem);
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.hero-description {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto var(--spacing-lg);
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* ===========================
   Buttons
   =========================== */
.btn {
    font-family: var(--font-subheading);
    font-size: 0.95rem;
    font-weight: 600;
    padding: 0.875rem 2rem;
    border-radius: var(--radius-sm);
    text-decoration: none;
    display: inline-block;
    transition: all var(--transition-base);
    cursor: pointer;
    border: 2px solid transparent;
}

/* Button Hover Effect */
.btn:hover {
    background: #333; /* Matte Grey */
    box-shadow: 0 0 10px rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
    transition: 0.3s;
}

.btn-primary {
    background-color: var(--primary-color);
    color: var(--btn-text);
}

.btn-primary:hover {
    background-color: var(--secondary-color);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
}

.btn-secondary {
    background-color: transparent;
    color: var(--primary-color);
    border-color: var(--primary-color);
}

.btn-secondary:hover {
    background-color: var(--primary-color);
    color: var(--btn-text);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
}

/* ===========================
   About Section
   =========================== */
.about {
    background-color: transparent;
}

.about-content {
    max-width: 900px;
    margin: 0 auto;
}

.about-description {
    font-size: 1.0625rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.8;
}

.about-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.info-item h3 {
    font-family: var(--font-subheading);
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--primary-color);
    margin-bottom: var(--spacing-xs);
}

.info-item p {
    font-size: 1.125rem;
    color: var(--text-primary);
    font-weight: 600;
}

/* ===========================
   Skills Section
   =========================== */
.skills {
    background-color: transparent;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
}

.skill-card {
    background-color: rgba(var(--bg-primary-rgb), 0.8);
    backdrop-filter: blur(5px);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    border: 1px solid var(--border-color);
}

.skill-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.skill-icon {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
}

.skill-icon svg {
    width: 28px;
    height: 28px;
    color: var(--btn-text);
}

.skill-card h3 {
    font-size: 1.375rem;
    margin-bottom: var(--spacing-sm);
}

.skill-card p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.skill-tags span {
    font-family: var(--font-subheading);
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.375rem 0.75rem;
    background-color: var(--bg-secondary);
    color: var(--text-secondary);
    border-radius: 20px;
}

/* ===========================
   Projects Section
   =========================== */
.projects {
    background-color: transparent;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.project-card {
    background-color: rgba(var(--bg-primary-rgb), 0.8);
    backdrop-filter: blur(5px);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    border: 1px solid var(--border-color);
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.project-image {
    position: relative;
    width: 100%;
    padding-bottom: 60%;
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--border-color) 100%);
    overflow: hidden;
}

.project-img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    transition: transform 0.5s ease;
}

.project-card:hover .project-img {
    transform: scale(1.05);
}

.project-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    opacity: 0;
    transition: opacity var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
}

.project-card:hover .project-overlay {
    opacity: 1;
}

.overlay-content {
    text-align: center;
}

.overlay-icon {
    width: 60px;
    height: 60px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background-color: rgba(255, 255, 255, 0.95);
    border-radius: 50%;
    transition: transform var(--transition-base);
}

.project-card:hover .overlay-icon {
    transform: scale(1.1);
}

.overlay-icon svg {
    width: 28px;
    height: 28px;
    color: #1a1a1a;
}

.project-content {
    padding: var(--spacing-md);
}

.project-content h3 {
    font-size: 1.375rem;
    margin-bottom: var(--spacing-sm);
}

.project-content p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
}

.project-role {
    font-size: 0.95rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: var(--spacing-md);
}

.project-tags span {
    font-family: var(--font-subheading);
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.375rem 0.75rem;
    background-color: var(--bg-secondary);
    color: var(--text-secondary);
    border-radius: 20px;
}

.project-link {
    font-family: var(--font-subheading);
    font-weight: 600;
    color: var(--primary-color);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    transition: all var(--transition-fast);
}

.project-link:hover {
    gap: 8px;
    color: var(--text-primary);
}

/* ===========================
   Contact Section
   =========================== */
.contact {
    background-color: transparent;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    max-width: 1000px;
    margin: 0 auto;
}

.contact-description {
    font-size: 1.0625rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.8;
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
}

.contact-item svg {
    width: 24px;
    height: 24px;
    color: var(--primary-color);
    flex-shrink: 0;
    margin-top: 4px;
}

.contact-item h4 {
    font-family: var(--font-subheading);
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-light);
    margin-bottom: 0.25rem;
}

.contact-item p,
.contact-item a {
    font-size: 1.0625rem;
    color: var(--text-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.contact-item a:hover {
    color: var(--primary-color);
}

.social-links {
    display: flex;
    gap: 1rem;
}

.social-links a {
    width: 44px;
    height: 44px;
    background-color: rgba(var(--bg-primary-rgb), 0.8);
    backdrop-filter: blur(5px);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: all var(--transition-base);
    box-shadow: var(--shadow-sm);
}

.social-links a:hover {
    background-color: var(--primary-color);
    color: var(--btn-text);
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.social-links svg {
    width: 20px;
    height: 20px;
}

/* ===========================
   Contact Form
   =========================== */
.contact-form {
    background-color: rgba(var(--bg-primary-rgb), 0.8);
    backdrop-filter: blur(5px);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

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

.form-group input,
.form-group textarea {
    width: 100%;
    font-family: var(--font-body);
    font-size: 1rem;
    padding: 0.875rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    transition: all var(--transition-base);
    background-color: var(--bg-primary);
    color: var(--text-primary);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.contact-form .btn {
    width: 100%;
}

/* ===========================
   Footer
   =========================== */
.footer {
    background-color: var(--bg-dark);
    color: var(--text-light);
    padding: var(--spacing-md) 0;
    text-align: center;
}

.footer p {
    font-size: 0.9rem;
}

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

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

/* ===========================
   Animations
   =========================== */
.fade-in {
    animation: fadeIn 1s ease forwards;
    opacity: 0;
}

.fade-in-up {
    animation: fadeInUp 1s ease forwards;
    opacity: 0;
}

@keyframes fadeIn {
    to {
        opacity: 1;
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-text > * {
    animation-fill-mode: both;
}

.hero-text > *:nth-child(1) {
    animation-delay: 0.1s;
}

.hero-text > *:nth-child(2) {
    animation-delay: 0.2s;
}

.hero-text > *:nth-child(3) {
    animation-delay: 0.3s;
}

.hero-text > *:nth-child(4) {
    animation-delay: 0.4s;
}

.hero-text > *:nth-child(5) {
    animation-delay: 0.5s;
}

/* Intersection Observer Classes */
.reveal {
    opacity: 0;
    transform: translateY(50px);
    transition: all 0.8s ease;
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* ===========================
   Animated Background Canvas
   =========================== */
#bg-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    pointer-events: none;
    opacity: 0.5;
}

body.dark #bg-canvas {
    opacity: 0.6;
}

/* ===========================
   Responsive Design
   =========================== */
@media (max-width: 968px) {
    .contact-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .section-title {
        font-size: 2rem;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 1.5rem;
    }
    
    .section {
        padding: var(--spacing-lg) 0;
    }
    
    .nav-menu {
        position: fixed;
        top: 72px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 72px);
        background-color: rgba(var(--bg-primary-rgb), 0.95);
        backdrop-filter: blur(10px);
        flex-direction: column;
        align-items: center;
        justify-content: flex-start;
        padding: var(--spacing-lg);
        gap: var(--spacing-md);
        transition: left var(--transition-base);
        box-shadow: var(--shadow-md);
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .menu-toggle {
        display: flex;
    }
    
    .menu-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(8px, 8px);
    }
    
    .menu-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .menu-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(6px, -6px);
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        max-width: 300px;
        text-align: center;
    }
    
    .about-info {
        grid-template-columns: 1fr;
    }
    
    .skills-grid {
        grid-template-columns: 1fr;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .theme-toggle {
        margin-left: 0.5rem;
    }
}

@media (max-width: 480px) {
    .section-title {
        font-size: 1.75rem;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1.125rem;
    }
    
    .skill-card,
    .contact-form {
        padding: var(--spacing-md);
    }
}