/* ===========================================
   CSS Variables & Reset
   =========================================== */
:root {
    /* Colors - Black & White palette */
    --color-bg: #fafafa;
    --color-bg-subtle: #f0f0f0;
    --color-bg-muted: #e8e8e8;
    --color-bg-card: #ffffff;
    --color-border: #e0e0e0;
    --color-border-subtle: #ebebeb;
    
    --color-text: #0a0a0a;
    --color-text-secondary: #404040;
    --color-text-muted: #666666;
    --color-text-subtle: #999999;
    
    --color-primary: #0a0a0a;
    --color-primary-hover: #1a1a1a;
    --color-accent: #171717;
    --color-accent-hover: #000000;
    --color-accent-light: rgba(0, 0, 0, 0.06);
    
    /* Gradients */
    --gradient-hero: #ffffff;
    --gradient-accent: linear-gradient(135deg, #0a0a0a, #333333, #0a0a0a);
    --gradient-text: linear-gradient(135deg, #0a0a0a 0%, #333333 50%, #0a0a0a 100%);
    --gradient-card: linear-gradient(145deg, rgba(255,255,255,0.9), rgba(255,255,255,0.6));
    --gradient-glass: linear-gradient(135deg, rgba(255,255,255,0.1), rgba(255,255,255,0.05));
    
    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    
    /* Font Sizes - Fluid Typography */
    --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.8125rem);
    --text-sm: clamp(0.8125rem, 0.75rem + 0.3vw, 0.875rem);
    --text-base: clamp(0.9375rem, 0.875rem + 0.3vw, 1rem);
    --text-lg: clamp(1.0625rem, 1rem + 0.3vw, 1.125rem);
    --text-xl: clamp(1.1875rem, 1.1rem + 0.4vw, 1.25rem);
    --text-2xl: clamp(1.375rem, 1.2rem + 0.8vw, 1.5rem);
    --text-3xl: clamp(1.75rem, 1.5rem + 1.2vw, 2.25rem);
    --text-4xl: clamp(2.25rem, 1.8rem + 2vw, 3rem);
    --text-5xl: clamp(2.75rem, 2rem + 3.5vw, 4.5rem);
    
    /* Font Weights */
    --font-light: 300;
    --font-regular: 400;
    --font-medium: 500;
    --font-semibold: 600;
    --font-bold: 700;
    --font-extrabold: 800;
    
    /* Line Heights */
    --leading-none: 1;
    --leading-tight: 1.15;
    --leading-snug: 1.375;
    --leading-normal: 1.5;
    --leading-relaxed: 1.625;
    
    /* Letter Spacing */
    --tracking-tighter: -0.05em;
    --tracking-tight: -0.025em;
    --tracking-normal: 0;
    --tracking-wide: 0.025em;
    --tracking-wider: 0.05em;
    --tracking-widest: 0.1em;
    
    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.25rem;
    --radius-3xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.07), 0 2px 4px -2px rgb(0 0 0 / 0.05);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.08), 0 4px 6px -4px rgb(0 0 0 / 0.04);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.05);
    --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.2);
    --shadow-glow: 0 0 40px rgba(0, 0, 0, 0.1);
    --shadow-card: 0 1px 3px rgb(0 0 0 / 0.04), 0 6px 16px rgb(0 0 0 / 0.06);
    --shadow-card-hover: 0 8px 30px rgb(0 0 0 / 0.12), 0 4px 12px rgb(0 0 0 / 0.06);
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-spring: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);
    
    /* Container */
    --container-max: 1200px;
    --container-padding: clamp(1rem, 5vw, 2rem);
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    font-size: var(--text-base);
    font-weight: var(--font-regular);
    line-height: var(--leading-normal);
    color: var(--color-text);
    background-color: var(--color-bg);
    overflow-x: hidden;
}

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

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

button {
    font-family: inherit;
    font-size: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

input {
    font-family: inherit;
    font-size: inherit;
    border: none;
    outline: none;
}

/* ===========================================
   Layout
   =========================================== */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

/* ===========================================
   Background Gradient Overlay
   =========================================== */
.bg-gradient-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: -1;
    background: 
        radial-gradient(ellipse 80% 50% at 50% -20%, rgba(0, 0, 0, 0.03), transparent),
        radial-gradient(ellipse 60% 40% at 80% 80%, rgba(0, 0, 0, 0.02), transparent);
}

/* ===========================================
   Header & Navigation
   =========================================== */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(250, 250, 250, 0.8);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
    transition: background var(--transition-base), box-shadow var(--transition-base);
}

.header.scrolled {
    background: rgba(255, 255, 255, 0.95);
    box-shadow: 0 1px 12px rgb(0 0 0 / 0.06);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    transition: opacity var(--transition-fast);
}

.logo:hover {
    opacity: 0.8;
}

.logo-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: #0a0a0a;
    border-radius: var(--radius-lg);
    color: white;
    font-size: 14px;
}

.logo-text {
    font-size: var(--text-lg);
    font-weight: var(--font-bold);
    letter-spacing: var(--tracking-tight);
    color: var(--color-text);
}

/* Hamburger Menu */
.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 40px;
    height: 40px;
    padding: 0;
    cursor: pointer;
    z-index: 110;
}

.hamburger {
    width: 22px;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    position: relative;
    transition: background var(--transition-fast);
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    width: 22px;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: transform var(--transition-base);
}

.hamburger::before {
    top: -7px;
}

.hamburger::after {
    top: 7px;
}

.nav-toggle.active .hamburger {
    background: transparent;
}

.nav-toggle.active .hamburger::before {
    transform: translateY(7px) rotate(45deg);
}

.nav-toggle.active .hamburger::after {
    transform: translateY(-7px) rotate(-45deg);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    color: var(--color-text-secondary);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-md);
    transition: color var(--transition-fast), background var(--transition-fast);
}

.nav-link:hover {
    color: var(--color-text);
    background: rgba(0, 0, 0, 0.04);
}

.nav-link i {
    font-size: 14px;
}

.nav-link--github,
.nav-link--social {
    padding: var(--space-2) var(--space-4);
    background: var(--color-bg-muted);
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}

.nav-link--github:hover {
    background: var(--color-primary);
    color: white;
}

.nav-link--social:hover {
    background: #333333;
    color: white;
}

/* ===========================================
   Hero Section
   =========================================== */
.hero {
    position: relative;
    padding: var(--space-24) 0;
    background: #ffffff;
    color: var(--color-text);
    border-bottom: 1px solid var(--color-border-subtle);
}

.hero-content {
    position: relative;
    max-width: 600px;
}

.hero-greeting {
    font-size: var(--text-4xl);
    font-weight: var(--font-bold);
    color: var(--color-text);
    margin-bottom: var(--space-3);
    letter-spacing: var(--tracking-tight);
}

.hero-title {
    font-size: var(--text-3xl);
    font-weight: var(--font-medium);
    line-height: var(--leading-tight);
    letter-spacing: var(--tracking-tighter);
    color: var(--color-text);
    margin-bottom: var(--space-6);
}

.hero-description {
    font-size: var(--text-lg);
    line-height: var(--leading-relaxed);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-8);
}

.hero-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-base);
    font-weight: var(--font-semibold);
    color: var(--color-text);
    letter-spacing: var(--tracking-wide);
    transition: gap var(--transition-base);
}

.hero-link:hover {
    gap: var(--space-3);
}

.hero-link i {
    font-size: 0.85em;
    transition: transform var(--transition-base);
}

.hero-link:hover i {
    transform: translateY(3px);
}

/* Hero Stats */
.hero-stats {
    display: flex;
    gap: var(--space-8);
    margin-top: var(--space-12);
}

.stat {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.stat-number {
    font-size: var(--text-2xl);
    font-weight: var(--font-bold);
    letter-spacing: var(--tracking-tight);
    color: var(--color-text);
    font-variant-numeric: tabular-nums;
    line-height: 1.2;
}

.stat-label {
    font-size: var(--text-xs);
    font-weight: var(--font-medium);
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: var(--tracking-wider);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
    border-radius: var(--radius-xl);
    transition: all var(--transition-base);
    cursor: pointer;
}

.btn-lg {
    padding: var(--space-3) var(--space-6);
    font-size: var(--text-base);
}

.btn-primary {
    background: #0a0a0a;
    color: white;
    border: none;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
}

.btn-primary:hover {
    background: #222222;
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
}

.btn-outline {
    background: transparent;
    color: var(--color-text);
    border: 1px solid var(--color-border);
}

.btn-outline:hover {
    background: rgba(0, 0, 0, 0.04);
    border-color: var(--color-text-subtle);
    transform: translateY(-2px);
}



/* ===========================================
   Tech Stack Bar
   =========================================== */
.tech-stack {
    padding: var(--space-6) 0;
    background: white;
    border-bottom: 1px solid var(--color-border-subtle);
}

.tech-stack-inner {
    display: flex;
    align-items: center;
    gap: var(--space-6);
    justify-content: center;
    flex-wrap: wrap;
}

.tech-label {
    font-size: var(--text-xs);
    font-weight: var(--font-semibold);
    text-transform: uppercase;
    letter-spacing: var(--tracking-widest);
    color: var(--color-text-subtle);
}

.tech-icons {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    flex-wrap: wrap;
}

.tech-item {
    display: inline-flex;
    align-items: center;
    padding: var(--space-1) var(--space-3);
    font-size: var(--text-xs);
    font-weight: var(--font-semibold);
    font-family: var(--font-mono);
    color: var(--color-text-muted);
    background: var(--color-bg-subtle);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}

.tech-item:hover {
    color: var(--color-accent);
    border-color: var(--color-accent);
    background: var(--color-accent-light);
    transform: translateY(-1px);
}

/* ===========================================
   Projects Section
   =========================================== */
.projects {
    padding: var(--space-20) 0 var(--space-24);
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-16);
}

.section-tag {
    display: inline-block;
    font-size: var(--text-xs);
    font-weight: var(--font-bold);
    letter-spacing: var(--tracking-widest);
    text-transform: uppercase;
    color: var(--color-accent);
    background: var(--color-accent-light);
    padding: var(--space-1) var(--space-4);
    border-radius: var(--radius-full);
    margin-bottom: var(--space-4);
}

.section-title {
    font-size: var(--text-4xl);
    font-weight: var(--font-extrabold);
    letter-spacing: var(--tracking-tighter);
    color: var(--color-text);
    margin-bottom: var(--space-4);
}

.section-subtitle {
    font-size: var(--text-lg);
    color: var(--color-text-muted);
    max-width: 480px;
    margin: 0 auto;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: var(--space-8);
}

/* ===========================================
   Project Card
   =========================================== */
.project-card {
    display: flex;
    flex-direction: column;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-2xl);
    overflow: hidden;
    box-shadow: var(--shadow-card);
    transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

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

.project-image {
    position: relative;
    aspect-ratio: 16 / 10;
    background: var(--color-bg-muted);
    overflow: hidden;
}

.project-image::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(to bottom, transparent 60%, rgba(0,0,0,0.03));
    pointer-events: none;
}

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

.project-card:hover .project-image img {
    transform: scale(1.06);
}

.project-image-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--color-bg-muted) 0%, var(--color-border) 100%);
}

.project-image-placeholder i {
    font-size: 48px;
    color: var(--color-text-subtle);
}

.project-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: var(--space-6);
}

.project-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: var(--space-4);
    margin-bottom: var(--space-3);
}

.project-name {
    font-size: var(--text-xl);
    font-weight: var(--font-bold);
    letter-spacing: var(--tracking-tight);
    color: var(--color-text);
    line-height: var(--leading-snug);
}

.project-link {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    color: var(--color-text-muted);
    background: var(--color-bg-subtle);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
}

.project-link:hover {
    background: #0a0a0a;
    color: white;
    transform: rotate(-5deg) scale(1.1);
}

.project-description {
    flex: 1;
    font-size: var(--text-sm);
    line-height: var(--leading-relaxed);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-5);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.project-meta {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-4);
    padding-top: var(--space-4);
    border-top: 1px solid var(--color-border-subtle);
}

.project-language {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-xs);
    font-weight: var(--font-semibold);
    color: var(--color-text-secondary);
}

.language-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    box-shadow: 0 0 0 3px rgba(0,0,0,0.04);
}

.project-stat {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    font-size: var(--text-xs);
    font-weight: var(--font-semibold);
    color: var(--color-text-muted);
}

.project-stat i {
    font-size: 13px;
    color: var(--color-accent);
}

.project-updated {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    font-size: var(--text-xs);
    font-weight: var(--font-regular);
    color: var(--color-text-subtle);
    margin-left: auto;
}

.project-updated i {
    font-size: 12px;
}

/* Language Colors */
.lang-cpp { background-color: #f34b7d; }
.lang-c { background-color: #555555; }
.lang-qml { background-color: #44a51c; }
.lang-javascript { background-color: #f1e05a; }
.lang-typescript { background-color: #3178c6; }
.lang-python { background-color: #3572A5; }
.lang-java { background-color: #b07219; }
.lang-csharp { background-color: #178600; }
.lang-html { background-color: #e34c26; }
.lang-css { background-color: #563d7c; }
.lang-shell { background-color: #89e051; }
.lang-cmake { background-color: #DA3434; }
.lang-default { background-color: #8b8b8b; }

/* ===========================================
   Loading & Error States
   =========================================== */
.loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-4);
    padding: var(--space-16) 0;
    color: var(--color-text-muted);
}

.loading-spinner {
    width: 44px;
    height: 44px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.error-message {
    text-align: center;
    padding: var(--space-16) 0;
    color: var(--color-text-muted);
}

.error-icon {
    font-size: 40px;
    color: #ef4444;
    margin-bottom: var(--space-4);
    display: block;
}

.error-message p {
    margin-bottom: var(--space-6);
    font-size: var(--text-lg);
}

/* ===========================================
   Footer
   =========================================== */
.footer {
    padding: var(--space-12) 0 var(--space-8);
    background: #fafafa;
    color: var(--color-text);
    border-top: 1px solid var(--color-border);
}

.footer-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--space-6);
    padding-bottom: var(--space-8);
    border-bottom: 1px solid var(--color-border);
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-lg);
    font-weight: var(--font-bold);
    color: var(--color-text);
}

.footer-logo i {
    color: var(--color-text-muted);
}

.footer-text {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
}

.footer-links {
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

.footer-link {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    color: var(--color-text-secondary);
    padding: var(--space-2) var(--space-4);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}

.footer-link:hover {
    color: var(--color-text);
    border-color: var(--color-text-subtle);
    background: rgba(0, 0, 0, 0.04);
}

.footer-bottom {
    padding-top: var(--space-6);
    text-align: center;
}

.footer-copyright {
    font-size: var(--text-xs);
    color: var(--color-text-subtle);
}

/* ===========================================
   Back to Top Button
   =========================================== */
.back-to-top {
    position: fixed;
    bottom: var(--space-6);
    right: var(--space-6);
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #0a0a0a;
    color: white;
    border: none;
    border-radius: var(--radius-full);
    font-size: 18px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all var(--transition-base);
    cursor: pointer;
    z-index: 50;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
}

/* ===========================================
   Reveal Animations
   =========================================== */
[data-reveal] {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.7s cubic-bezier(0.4, 0, 0.2, 1), transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-reveal].revealed {
    opacity: 1;
    transform: translateY(0);
}

/* ===========================================
   Animations
   =========================================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(25px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-15px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.project-card {
    animation: fadeIn 0.5s ease forwards;
    opacity: 0;
}

.project-card:nth-child(1) { animation-delay: 0.05s; }
.project-card:nth-child(2) { animation-delay: 0.1s; }
.project-card:nth-child(3) { animation-delay: 0.15s; }
.project-card:nth-child(4) { animation-delay: 0.2s; }
.project-card:nth-child(5) { animation-delay: 0.25s; }
.project-card:nth-child(6) { animation-delay: 0.3s; }
.project-card:nth-child(7) { animation-delay: 0.35s; }
.project-card:nth-child(8) { animation-delay: 0.4s; }
.project-card:nth-child(9) { animation-delay: 0.45s; }

/* No results */
.no-results {
    grid-column: 1 / -1;
    text-align: center;
    padding: var(--space-16) 0;
    color: var(--color-text-muted);
}

.no-results p {
    font-size: var(--text-lg);
}

/* ===========================================
   Lightbox
   =========================================== */
.lightbox {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.95);
    backdrop-filter: blur(10px);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-base), visibility var(--transition-base);
}

.lightbox.active {
    opacity: 1;
    visibility: visible;
}

.lightbox-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    max-width: 90vw;
    max-height: 90vh;
}

.lightbox-content img {
    max-width: 100%;
    max-height: 75vh;
    object-fit: contain;
    border-radius: var(--radius-xl);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

.lightbox-caption {
    text-align: center;
    margin-top: var(--space-6);
    max-width: 600px;
}

.lightbox-caption h3 {
    font-size: var(--text-2xl);
    font-weight: var(--font-bold);
    color: #fff;
    margin-bottom: var(--space-2);
}

.lightbox-caption p {
    font-size: var(--text-base);
    color: rgba(255, 255, 255, 0.7);
    line-height: var(--leading-relaxed);
}

.lightbox-close {
    position: absolute;
    top: var(--space-6);
    right: var(--space-6);
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    color: #fff;
    font-size: 24px;
    cursor: pointer;
    transition: background var(--transition-fast), transform var(--transition-fast);
}

.lightbox-close:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: scale(1.1) rotate(90deg);
}

.lightbox-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    color: #fff;
    font-size: 20px;
    cursor: pointer;
    transition: background var(--transition-fast), transform var(--transition-fast);
}

.lightbox-nav:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-50%) scale(1.1);
}

.lightbox-prev { left: var(--space-6); }
.lightbox-next { right: var(--space-6); }

/* Clickable project image */
.project-img-clickable {
    cursor: zoom-in;
}

/* ===========================================
   Responsive
   =========================================== */
@media (max-width: 768px) {
    .hero {
        padding: var(--space-16) 0;
    }
    
    /* Mobile Nav */
    .nav-toggle {
        display: flex;
    }
    
    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: white;
        flex-direction: column;
        align-items: flex-start;
        padding: 80px var(--space-6) var(--space-6);
        box-shadow: -5px 0 30px rgba(0,0,0,0.1);
        transition: right var(--transition-slow);
        z-index: 105;
    }
    
    .nav-links.active {
        right: 0;
    }
    
    .nav-link {
        width: 100%;
        padding: var(--space-3) var(--space-4);
        font-size: var(--text-base);
    }
    
    .nav-link--github,
    .nav-link--social {
        border-radius: var(--radius-lg);
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
        align-items: center;
    }
    
    .footer-brand {
        align-items: center;
    }
    

    
    .lightbox-nav {
        width: 44px;
        height: 44px;
        font-size: 16px;
    }
    
    .lightbox-prev { left: var(--space-2); }
    .lightbox-next { right: var(--space-2); }
    
    .lightbox-close {
        top: var(--space-4);
        right: var(--space-4);
        width: 40px;
        height: 40px;
        font-size: 20px;
    }
    
    .lightbox-caption h3 { font-size: var(--text-xl); }
    .lightbox-caption p { font-size: var(--text-sm); }
    
    .hero-stats {
        flex-direction: column;
        gap: var(--space-4);
    }
}

@media (max-width: 480px) {
    .nav-link:not(.nav-link--github) {
        display: flex;
    }
    
    .hero-title {
        font-size: var(--text-4xl);
    }
    
    .tech-icons {
        justify-content: center;
    }
    
    .projects-grid {
        gap: var(--space-6);
    }
}

/* ===========================================
   Filter Section (preserved for potential use)
   =========================================== */
.filter-section {
    padding: var(--space-8) 0;
    background: var(--color-bg-subtle);
    border-bottom: 1px solid var(--color-border-subtle);
}

.filter-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--space-4);
}

.filter-group {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    flex-wrap: wrap;
}

.filter-btn {
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    color: var(--color-text-secondary);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}

.filter-btn:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.filter-btn.active {
    background: var(--color-accent);
    border-color: var(--color-accent);
    color: white;
}

.search-box {
    position: relative;
    display: flex;
    align-items: center;
}

.search-icon {
    position: absolute;
    left: var(--space-3);
    color: var(--color-text-muted);
    pointer-events: none;
}

.search-input {
    width: 240px;
    padding: var(--space-2) var(--space-4);
    padding-left: var(--space-10);
    font-size: var(--text-sm);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.search-input:focus {
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.08);
}

.search-input::placeholder {
    color: var(--color-text-subtle);
}

/* ===========================================
   Selection & Scrollbar
   =========================================== */
::selection {
    background: rgba(0, 0, 0, 0.12);
    color: var(--color-text);
}

::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--color-bg);
}

::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-subtle);
}