/* ============================================
   CSS Variables - Signature Color Scheme
   ============================================ */
:root {
    /* Signature Colors */
    --signature-color: #0EA5E9; /* Sky Blue - Your unique accent */
    --signature-gradient: linear-gradient(135deg, #0EA5E9 0%, #06B6D4 100%);
    
    /* Base Colors - Light Mode */
    --background: #FAFAFA;
    --surface: #FFFFFF;
    --surface-secondary: #F5F5F5;
    --text-primary: #1A1A1A;
    --text-secondary: #666666;
    --text-tertiary: #999999;
    --border: #E5E5E5;
    --shadow: rgba(0, 0, 0, 0.08);
    
    /* Spacing System */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-2xl: 4rem;
    --space-3xl: 6rem;
    
    /* Typography */
    --font-heading: 'Space Grotesk', sans-serif;
    --font-body: 'Inter', sans-serif;
    --font-size-xs: 0.875rem;
    --font-size-sm: 1rem;
    --font-size-md: 1.125rem;
    --font-size-lg: 1.5rem;
    --font-size-xl: 2rem;
    --font-size-2xl: 2.5rem;
    --font-size-3xl: 3.5rem;
    
    /* Effects */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark Mode */
[data-theme="dark"] {
    --background: #0A0A0A;
    --surface: #121212;
    --surface-secondary: #1A1A1A;
    --text-primary: #F5F5F5;
    --text-secondary: #B3B3B3;
    --text-tertiary: #737373;
    --border: #2A2A2A;
    --shadow: rgba(0, 0, 0, 0.4);
}

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

html {
    scroll-behavior: smooth;
    overflow-x: hidden;
}

body {
    font-family: var(--font-body);
    font-size: var(--font-size-sm);
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--background);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

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

a {
    color: inherit;
    text-decoration: none;
}

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

/* ============================================
   Skip Link & Accessibility
   ============================================ */
.skip-link {
    position: absolute;
    top: -100px;
    left: var(--space-sm);
    background: var(--signature-color);
    color: white;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-sm);
    font-weight: 600;
    z-index: 1000;
    transition: var(--transition-fast);
}

.skip-link:focus {
    top: var(--space-sm);
    outline: 3px solid var(--signature-color);
    outline-offset: 4px;
}

/* ============================================
   Scroll Progress Bar
   ============================================ */
.scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    width: 0%;
    height: 3px;
    background: var(--signature-gradient);
    z-index: 999;
    transition: width 0.1s ease-out;
}

/* ============================================
   Theme Toggle
   ============================================ */
.theme-toggle {
    position: fixed;
    top: var(--space-lg);
    right: var(--space-lg);
    width: 48px;
    height: 48px;
    background: var(--surface);
    border: 2px solid var(--border);
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-base);
    z-index: 100;
}

.theme-toggle:hover {
    transform: scale(1.1) rotate(10deg);
    border-color: var(--signature-color);
    box-shadow: 0 4px 12px var(--shadow);
}

.theme-toggle svg {
    width: 20px;
    height: 20px;
    fill: var(--text-primary);
    stroke: none;
}

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

[data-theme="dark"] .theme-toggle .sun-icon {
    display: block;
}

[data-theme="dark"] .theme-toggle .moon-icon {
    display: none;
}

/* ============================================
   Container
   ============================================ */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-lg);
}

/* ============================================
   Hero Section with Animated Background
   ============================================ */
.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
    overflow: hidden;
    padding: var(--space-3xl) 0;
}

/* Animated Gradient Orbs */
.hero-background {
    position: absolute;
    inset: 0;
    overflow: hidden;
    z-index: -1;
}

.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.3;
    animation: float 20s infinite ease-in-out;
}

.orb-1 {
    width: 400px;
    height: 400px;
    background: var(--signature-gradient);
    top: -200px;
    left: -200px;
    animation-delay: 0s;
}

.orb-2 {
    width: 350px;
    height: 350px;
    background: linear-gradient(135deg, #8B5CF6 0%, #06B6D4 100%);
    bottom: -150px;
    right: -150px;
    animation-delay: -7s;
}

.orb-3 {
    width: 300px;
    height: 300px;
    background: linear-gradient(135deg, #EC4899 0%, #8B5CF6 100%);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: -14s;
}

@keyframes float {
    0%, 100% {
        transform: translate(0, 0) scale(1);
    }
    33% {
        transform: translate(30px, -30px) scale(1.1);
    }
    66% {
        transform: translate(-20px, 20px) scale(0.9);
    }
}

/* Hero Content */
.hero-content {
    position: relative;
    z-index: 1;
    max-width: 900px;
}

.hero-name {
    font-size: clamp(2.5rem, 8vw, var(--font-size-3xl));
    font-weight: 700;
    margin-bottom: var(--space-md);
    letter-spacing: -0.03em;
}

.name-first {
    display: block;
    color: var(--text-primary);
}

.name-last {
    display: block;
    background: var(--signature-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-title {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    font-weight: 600;
    margin-bottom: var(--space-md);
    font-family: var(--font-heading);
}

.hero-tagline {
    font-size: clamp(1.1rem, 3vw, var(--font-size-md));
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto var(--space-xl);
    line-height: 1.7;
}

/* Hero Stats */
.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--space-xl);
    margin-top: var(--space-2xl);
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--signature-color);
    font-family: var(--font-heading);
}

.stat-label {
    display: block;
    font-size: var(--font-size-xs);
    color: var(--text-tertiary);
    margin-top: var(--space-xs);
    font-weight: 500;
}

/* ============================================
   Section Headers
   ============================================ */
.section-header {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-2xl);
}

.section-number {
    font-size: var(--font-size-sm);
    color: var(--signature-color);
    font-weight: 700;
    font-family: var(--font-heading);
}

.section-header h2 {
    font-size: var(--font-size-xl);
    font-weight: 700;
}

/* ============================================
   About Section
   ============================================ */
.about-section {
    padding: var(--space-3xl) 0;
}

.about-content {
    display: grid;
    gap: var(--space-2xl);
}

.about-text p {
    margin-bottom: var(--space-md);
    color: var(--text-secondary);
    line-height: 1.8;
}

.about-text .lead {
    font-size: var(--font-size-md);
    color: var(--text-primary);
    font-weight: 500;
}

/* Tech Stack */
.tech-stack h3 {
    font-size: var(--font-size-md);
    margin-bottom: var(--space-md);
    color: var(--text-primary);
}

.tech-pills {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.pill {
    padding: var(--space-xs) var(--space-md);
    background: var(--surface);
    border: 2px solid var(--border);
    border-radius: 50px;
    font-size: var(--font-size-xs);
    font-weight: 600;
    color: var(--text-primary);
    transition: all var(--transition-fast);
}

.pill:hover {
    border-color: var(--signature-color);
    transform: translateY(-2px);
}

/* ============================================
   Projects Section - Bento Grid
   ============================================ */
.projects-section {
    padding: var(--space-3xl) 0;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-lg);
}

/* Featured Project - Spans 2 columns */
.project-card.featured {
    grid-column: span 2;
}

/* Project Card */
.project-card {
    background: var(--surface);
    border: 2px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-base);
    position: relative;
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px var(--shadow);
    border-color: var(--signature-color);
}

.project-link {
    display: block;
}

/* Project Badge */
.project-badge {
    position: absolute;
    top: var(--space-md);
    right: var(--space-md);
    background: var(--signature-gradient);
    color: white;
    padding: var(--space-xs) var(--space-md);
    border-radius: 50px;
    font-size: var(--font-size-xs);
    font-weight: 700;
    z-index: 10;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Project Image */
.project-image {
    position: relative;
    aspect-ratio: 16/9;
    overflow: hidden;
    background: var(--surface-secondary);
}

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

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

/* Project Overlay */
.project-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(0,0,0,0.8) 0%, transparent 100%);
    display: flex;
    align-items: flex-end;
    padding: var(--space-lg);
    opacity: 0;
    transition: opacity var(--transition-base);
}

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

.view-project {
    color: white;
    font-weight: 600;
    font-size: var(--font-size-md);
}

/* Project Info */
.project-info {
    padding: var(--space-lg);
}

.project-info h3 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--space-sm);
    color: var(--text-primary);
}

.project-info p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--space-md);
}

/* Project Tags */
.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
    margin-bottom: var(--space-md);
}

.tag {
    padding: 4px 12px;
    background: var(--surface-secondary);
    border: 1px solid var(--border);
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
}

/* Project Metrics (Featured only) */
.project-metrics {
    display: flex;
    gap: var(--space-lg);
    padding-top: var(--space-md);
    border-top: 1px solid var(--border);
}

.metric {
    display: flex;
    flex-direction: column;
}

.metric strong {
    font-size: var(--font-size-lg);
    color: var(--signature-color);
    font-weight: 700;
    font-family: var(--font-heading);
}

.metric span {
    font-size: var(--font-size-xs);
    color: var(--text-tertiary);
    margin-top: 2px;
}

/* ============================================
   Contact Section
   ============================================ */
.contact-section {
    padding: var(--space-3xl) 0;
}

.contact-content {
    max-width: 1200px;
}

.contact-lead {
    font-size: var(--font-size-md);
    color: var(--text-secondary);
    margin-bottom: var(--space-2xl);
    line-height: 1.8;
}
.contact-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
}
.contact-card {
    display: flex;
    align-items: flex-start;
    gap: var(--space-md);
    padding: var(--space-lg);
    background: var(--surface);
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
}

.contact-card:hover {
    border-color: var(--signature-color);
    transform: translateY(-4px);
    box-shadow: 0 8px 24px var(--shadow);
}

.contact-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-sm);
    background: var(--surface-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: all var(--transition-base);
}

.contact-card:hover .contact-icon {
    background: var(--signature-gradient);
}

.contact-icon svg {
    width: 24px;
    height: 24px;
    fill: var(--text-primary);
    transition: all var(--transition-base);
}

.contact-card:hover .contact-icon svg {
    fill: white;
}

.contact-info h3 {
    font-size: var(--font-size-md);
    margin-bottom: 4px;
    color: var(--text-primary);
}

.contact-info p {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

/* ============================================
   Footer
   ============================================ */
.site-footer {
    padding: var(--space-2xl) 0;
    text-align: center;
    border-top: 1px solid var(--border);
    margin-top: var(--space-3xl);
}

.site-footer p {
    color: var(--text-tertiary);
    font-size: var(--font-size-xs);
    margin-bottom: var(--space-xs);
}

.footer-note {
    color: var(--text-tertiary);
    font-style: italic;
}

/* ============================================
   Animations
   ============================================ */
.fade-in {
    animation: fadeInUp 0.8s ease-out forwards;
}

.fade-in-section {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in-section.visible {
    opacity: 1;
    transform: translateY(0);
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 1024px) {
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .project-card.featured {
        grid-column: span 1;
    }
}

@media (max-width: 768px) {
    :root {
        --space-lg: 1.5rem;
        --space-xl: 2rem;
        --space-2xl: 3rem;
        --space-3xl: 4rem;
    }
    
    .container {
        padding: var(--space-md);
    }
    
    .theme-toggle {
        top: var(--space-md);
        right: var(--space-md);
        width: 40px;
        height: 40px;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: var(--space-md);
    }
    
    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-sm);
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
    }
    
    .project-metrics {
        flex-direction: column;
        gap: var(--space-sm);
    }
}

@media (max-width: 480px) {
    .hero-name {
        font-size: 2rem;
    }
    
    .section-header h2 {
        font-size: var(--font-size-lg);
    }
    
    .project-info h3 {
        font-size: var(--font-size-md);
    }
}

/* ============================================
   Focus States (Accessibility)
   ============================================ */
*:focus-visible {
    outline: 3px solid var(--signature-color);
    outline-offset: 4px;
}

/* ============================================
   Selection
   ============================================ */
::selection {
    background: var(--signature-color);
    color: white;
}

/* ============================================
   Print Styles
   ============================================ */
@media print {
    .theme-toggle,
    .scroll-progress,
    .hero-background {
        display: none;
    }
}