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

:root {
    /* Colors */
    --color-primary: #1a1a1a;
    --color-secondary: #4a90e2;
    --color-text: #333333;
    --color-text-light: #666666;
    --color-background: #ffffff;
    --color-background-alt: #f8f9fa;
    --color-border: #e0e0e0;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-base: 18px;
    --line-height-base: 1.6;

    /* Spacing */
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 48px;
    --spacing-xl: 80px;
    --spacing-xxl: 120px;

    /* Layout */
    --max-width: 1200px;
    --max-width-narrow: 800px;

    /* Transitions */
    --transition: all 0.3s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    color: var(--color-text);
    background-color: var(--color-background);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    opacity: 0;
    overflow-x: hidden;
}

/* ===================================
   Typography
   =================================== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

h1 { font-size: 3rem; }
h2 { font-size: 2.25rem; }
h3 { font-size: 1.5rem; }

p {
    margin-bottom: var(--spacing-sm);
}

a {
    color: var(--color-secondary);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    opacity: 0.8;
}

/* ===================================
   Layout Components
   =================================== */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.section-title {
    font-size: 2.25rem;
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

/* ===================================
   Navigation
   =================================== */
.nav {
    position: sticky;
    top: 0;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-md) 0;
    z-index: 100;
}

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

.nav-logo {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--color-primary);
}

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

.nav-link {
    color: var(--color-text);
    font-weight: 500;
    position: relative;
}

.nav-link:hover {
    color: var(--color-secondary);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-secondary);
    transition: width 0.3s ease;
}

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

/* ===================================
   Hero Section
   =================================== */
.hero {
    min-height: 80vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--spacing-xxl) 0;
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
}

.hero-title {
    font-size: 3.5rem;
    margin-bottom: var(--spacing-sm);
    color: var(--color-primary);
}

.hero-subtitle {
    font-size: 1.75rem;
    color: var(--color-secondary);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.hero-description {
    font-size: 1.25rem;
    color: var(--color-text-light);
    max-width: 700px;
    margin: 0 auto var(--spacing-lg);
    line-height: 1.8;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
}

/* ===================================
   Buttons
   =================================== */
.btn {
    display: inline-block;
    padding: 14px 32px;
    border-radius: 6px;
    font-weight: 600;
    font-size: 1rem;
    text-align: center;
    transition: var(--transition);
    cursor: pointer;
    border: 2px solid transparent;
}

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

.btn-primary:hover {
    background-color: #333333;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}

.btn-secondary:hover {
    background-color: var(--color-primary);
    color: white;
    transform: translateY(-2px);
}

/* ===================================
   Projects Section
   =================================== */
.projects {
    padding: var(--spacing-xxl) 0;
    background-color: var(--color-background);
}

.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.project-card {
    background-color: white;
    border-radius: 12px;
    overflow: hidden;
    transition: var(--transition);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.15);
}

.project-image {
    width: 100%;
    height: 300px;
    overflow: hidden;
    background-color: var(--color-background-alt);
    display: flex;
    align-items: center;
    justify-content: center;
}

.project-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

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

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

.project-title {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-xs);
    color: var(--color-primary);
}

.project-tags {
    font-size: 0.9rem;
    color: var(--color-secondary);
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
}

.project-description {
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
}

.project-link {
    color: var(--color-secondary);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.project-link:hover {
    gap: 8px;
}

/* ===================================
   About Preview Section
   =================================== */
.about-preview {
    padding: var(--spacing-xxl) 0;
    background-color: var(--color-background-alt);
}

.about-content {
    max-width: var(--max-width-narrow);
    margin: 0 auto;
    text-align: center;
}

.about-text {
    font-size: 1.125rem;
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
    line-height: 1.8;
}

.about-content .btn {
    margin-top: var(--spacing-md);
}

/* ===================================
   Contact Section
   =================================== */
.contact {
    padding: var(--spacing-xxl) 0;
    background-color: var(--color-background);
    text-align: center;
}

.contact-text {
    font-size: 1.25rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-lg);
    line-height: 1.8;
}

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

/* ===================================
   Footer
   =================================== */
.footer {
    padding: var(--spacing-lg) 0;
    background-color: var(--color-primary);
    color: white;
    text-align: center;
}

.footer-text {
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.footer-subtext {
    font-size: 0.9rem;
    opacity: 0.8;
}

/* ===================================
   Animation Enhancements
   =================================== */

/* Initial states for animated elements */
.hero-title,
.hero-subtitle,
.hero-description,
.hero-cta .btn,
.section-title,
.project-card,
.about-section,
.strength-card,
.timeline-item,
.skill-category,
.contact-text,
.contact-links .btn {
    opacity: 0;
}

/* Smooth transitions for all interactive elements */
.btn,
.nav-link,
.project-card,
.project-link {
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Enhanced hover states */
.project-card {
    will-change: transform;
    backface-visibility: hidden;
    transform: translateZ(0);
}

.btn {
    will-change: transform, box-shadow;
    position: relative;
    overflow: hidden;
}

/* Smooth image transitions */
.project-image img {
    will-change: transform;
    backface-visibility: hidden;
}

/* GPU acceleration for better performance */
.hero,
.nav,
.project-card,
.strength-card {
    transform: translateZ(0);
    backface-visibility: hidden;
}

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

/* ===================================
   Responsive Design
   =================================== */

/* Tablet (768px - 1024px) */
@media (max-width: 1024px) {
    :root {
        --font-size-base: 17px;
        --spacing-xl: 64px;
        --spacing-xxl: 96px;
    }

    .hero-title {
        font-size: 3rem;
    }

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

/* Mobile (max 768px) */
@media (max-width: 768px) {
    :root {
        --font-size-base: 16px;
        --spacing-lg: 32px;
        --spacing-xl: 48px;
        --spacing-xxl: 64px;
    }

    h1 { font-size: 2.5rem; }
    h2 { font-size: 2rem; }
    h3 { font-size: 1.25rem; }

    .nav-menu {
        gap: var(--spacing-md);
    }

    .nav-link {
        font-size: 0.9rem;
    }

    .hero {
        min-height: 70vh;
        padding: var(--spacing-xl) 0;
    }

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

    .hero-subtitle {
        font-size: 1.5rem;
    }

    .hero-description {
        font-size: 1.125rem;
    }

    .hero-cta {
        flex-direction: column;
        align-items: stretch;
    }

    .project-grid {
        grid-template-columns: 1fr;
    }

    .project-image {
        height: 200px;
    }

    .section-title {
        font-size: 2rem;
        margin-bottom: var(--spacing-lg);
    }
}

/* Small Mobile (max 480px) */
@media (max-width: 480px) {
    .nav-container {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .nav-menu {
        gap: var(--spacing-sm);
    }

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

    .hero-subtitle {
        font-size: 1.25rem;
    }

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

    .btn {
        padding: 12px 24px;
        font-size: 0.9rem;
    }
}

/* ===================================
   Projects Page Styles
   =================================== */

/* Projects Hero */
.projects-hero {
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
    padding: var(--spacing-xxl) 0 var(--spacing-xl);
    text-align: center;
}

.section-intro {
    max-width: 700px;
    margin: 0 auto var(--spacing-lg);
    font-size: 1.125rem;
    color: var(--color-text-light);
    text-align: center;
}

/* Projects Grid - Large Featured Cards */
.projects-section {
    padding: var(--spacing-xxl) 0;
}

.projects-grid-large {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xxl);
    margin-top: var(--spacing-xl);
}

.project-card-featured {
    background: white;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
    transition: var(--transition);
}

.project-card-featured:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.12);
}

.project-image-featured {
    width: 100%;
    height: 400px;
    position: relative;
    overflow: hidden;
    background-color: var(--color-background-alt);
    display: flex;
    align-items: center;
    justify-content: center;
}

.project-image-featured img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

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

.placeholder-project {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    font-size: 2rem;
    font-weight: 700;
}

.project-badge {
    position: absolute;
    top: var(--spacing-md);
    left: var(--spacing-md);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 600;
    backdrop-filter: blur(10px);
}

.badge-ux {
    background: rgba(74, 144, 226, 0.9);
    color: white;
}

.badge-engineering {
    background: rgba(156, 39, 176, 0.9);
    color: white;
}

.badge-ai {
    background: rgba(102, 126, 234, 0.9);
    color: white;
}

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

.project-title-large {
    font-size: 1.75rem;
    margin-bottom: var(--spacing-md);
    color: var(--color-primary);
}

.project-description-large {
    font-size: 1.125rem;
    color: var(--color-text-light);
    line-height: 1.8;
    margin-bottom: var(--spacing-lg);
}

.project-stats {
    display: flex;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-md) 0;
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.stat-item {
    font-size: 0.95rem;
    color: var(--color-text);
}

.stat-highlight {
    font-weight: 700;
    color: var(--color-secondary);
    font-size: 1.125rem;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-lg);
}

.tag {
    padding: var(--spacing-xs) var(--spacing-sm);
    background-color: var(--color-background-alt);
    border-radius: 4px;
    font-size: 0.875rem;
    color: var(--color-text);
    font-weight: 500;
}

/* Project Categories */
.project-categories {
    padding: var(--spacing-xxl) 0;
    background-color: var(--color-background-alt);
}

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

.category-card {
    background: white;
    padding: var(--spacing-xl);
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.category-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.category-card h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
    color: var(--color-primary);
}

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

.category-card ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.category-card li {
    padding: var(--spacing-xs) 0;
    color: var(--color-text);
    font-size: 0.95rem;
}

.category-card li::before {
    content: "→";
    margin-right: var(--spacing-xs);
    color: var(--color-secondary);
    font-weight: 600;
}

/* Skills Showcase */
.skills-showcase {
    padding: var(--spacing-xxl) 0;
}

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

.skill-category-compact h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-md);
    color: var(--color-primary);
}

.skill-pills {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.pill {
    padding: var(--spacing-xs) var(--spacing-sm);
    background: linear-gradient(135deg, var(--color-secondary) 0%, #667eea 100%);
    color: white;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 500;
}

/* Projects CTA */
.projects-cta {
    padding: var(--spacing-xxl) 0;
    background-color: var(--color-background-alt);
    text-align: center;
}

.projects-cta h2 {
    margin-bottom: var(--spacing-md);
}

.projects-cta p {
    max-width: 700px;
    margin: 0 auto var(--spacing-lg);
    font-size: 1.125rem;
    color: var(--color-text-light);
}

.cta-buttons {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
}

/* Responsive Design for Projects Page */
@media (max-width: 768px) {
    .project-image-featured {
        height: 250px;
    }

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

    .project-description-large {
        font-size: 1rem;
    }

    .project-stats {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .category-grid,
    .skills-grid-compact {
        grid-template-columns: 1fr;
    }

    .cta-buttons {
        flex-direction: column;
    }
}

/* ===================================
   Three.js Canvas
   =================================== */
#three-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    pointer-events: none;
}

/* ===================================
   Custom Cursor
   =================================== */
.custom-cursor {
    position: fixed;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background-color: var(--color-secondary);
    pointer-events: none;
    z-index: 9999;
    mix-blend-mode: difference;
    transform: translate(-50%, -50%);
    transition: width 0.3s ease, height 0.3s ease;
}

.cursor-follower {
    position: fixed;
    width: 40px;
    height: 40px;
    border: 2px solid var(--color-secondary);
    border-radius: 50%;
    pointer-events: none;
    z-index: 9998;
    mix-blend-mode: difference;
    transform: translate(-50%, -50%);
    opacity: 0.5;
}

/* ===================================
   Cursor Trail
   =================================== */
.cursor-trail {
    position: fixed;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-secondary), #9b59b6);
    pointer-events: none;
    z-index: 9997;
    transform: translate(-50%, -50%);
}

/* ===================================
   Ripple Effect
   =================================== */
.ripple {
    position: fixed;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: radial-gradient(circle, var(--color-secondary) 0%, transparent 70%);
    pointer-events: none;
    z-index: 9996;
    transform: translate(-50%, -50%);
}

/* ===================================
   Burst Particles
   =================================== */
.burst-particle {
    position: fixed;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: linear-gradient(135deg, #4a90e2, #9b59b6, #e74c3c);
    pointer-events: none;
    z-index: 9995;
    transform: translate(-50%, -50%);
    box-shadow: 0 0 10px rgba(74, 144, 226, 0.6);
}

/* ===================================
   Shimmer Effect
   =================================== */
.shimmer {
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg,
        transparent 0%,
        rgba(255, 255, 255, 0.3) 50%,
        transparent 100%);
    pointer-events: none;
    z-index: 1;
}

/* ===================================
   Enhanced 3D Transforms
   =================================== */
.project-card {
    transform-style: preserve-3d;
    perspective: 1000px;
}

.project-card:hover {
    transform-style: preserve-3d;
}

.project-content {
    transform: translateZ(30px);
}

/* ===================================
   Magnetic Elements
   =================================== */
.btn,
.nav-link,
.project-card {
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    will-change: transform;
}

/* ===================================
   Section Animations
   =================================== */
section {
    opacity: 1;
    overflow: hidden;
}

/* ===================================
   Advanced Gradient Background
   =================================== */
body {
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
    transition: background 0.5s ease;
}

/* ===================================
   Text Character Animations
   =================================== */
.hero-description span,
.about-text span,
.project-description span {
    display: inline-block;
    will-change: opacity, transform;
}

/* ===================================
   Smooth Perspective
   =================================== */
.project-grid {
    perspective: 2000px;
}

/* ===================================
   Glow Effects
   =================================== */
.btn:hover {
    box-shadow: 0 0 20px rgba(74, 144, 226, 0.4),
                0 0 40px rgba(74, 144, 226, 0.2);
}

.project-card:hover {
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2),
                0 0 40px rgba(74, 144, 226, 0.1);
}

/* ===================================
   Hide Custom Cursor on Touch Devices
   =================================== */
@media (hover: none) and (pointer: coarse) {
    .custom-cursor,
    .cursor-follower,
    .cursor-trail {
        display: none;
    }
}

/* ===================================
   Performance Optimizations
   =================================== */
.custom-cursor,
.cursor-follower,
.cursor-trail,
.ripple,
.burst-particle,
.shimmer {
    will-change: transform, opacity;
    backface-visibility: hidden;
}

/* Reduce animations on low-end devices */
@media (prefers-reduced-motion: reduce) {
    .custom-cursor,
    .cursor-follower,
    .cursor-trail,
    .ripple,
    .burst-particle {
        display: none;
    }

    #three-canvas {
        display: none;
    }
}