/* ========================================
   GLASSMORPHISM DESIGN SYSTEM
   Personal Portfolio - Marcel Frank
   ======================================== */

:root {
    /* Glass Primary Palette */
    --glass-bg: rgba(255, 255, 255, 0.1);
    --glass-bg-hover: rgba(255, 255, 255, 0.15);
    --glass-border: rgba(255, 255, 255, 0.2);
    --glass-border-hover: rgba(255, 255, 255, 0.3);
    --glass-blur: blur(24px);
    --glass-blur-strong: blur(40px);
    
    /* Accent - Monochromatic Blue */
    --accent-primary: #3B82F6;
    --accent-secondary: #60A5FA;
    --accent-tertiary: #1D4ED8;
    --accent-gradient: linear-gradient(135deg, #1D4ED8 0%, #3B82F6 50%, #60A5FA 100%);
    --accent-gradient-warm: linear-gradient(135deg, #3B82F6 0%, #60A5FA 100%);
    --accent-gradient-cool: linear-gradient(135deg, #1D4ED8 0%, #3B82F6 100%);
    --accent-glow: rgba(59, 130, 246, 0.6);
    
    /* Background */
    --bg-primary: #050810;
    --bg-secondary: #080c14;
    --bg-tertiary: #0a1020;
    
    /* Text - Pure white for glass contrast */
    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.9);
    --text-muted: rgba(255, 255, 255, 0.7);
    --text-subtle: rgba(255, 255, 255, 0.45);
    
    /* Shadows */
    --shadow-glass: 0 8px 32px rgba(0, 0, 0, 0.3);
    --shadow-glass-hover: 0 20px 60px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 60px rgba(59, 130, 246, 0.4);
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* ========================================
   BASE STYLES
   ======================================== */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Poppins', sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-primary);
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
}

/* Monochromatic Blue Background with Parallax Layers */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 150%;
    background: 
        radial-gradient(ellipse 80% 80% at -10% 110%, rgba(59, 130, 246, 0.5) 0%, rgba(29, 78, 216, 0.25) 30%, transparent 60%),
        radial-gradient(ellipse 70% 70% at 110% -10%, rgba(96, 165, 250, 0.4) 0%, rgba(59, 130, 246, 0.2) 30%, transparent 60%),
        radial-gradient(ellipse 60% 60% at 50% 120%, rgba(29, 78, 216, 0.35) 0%, transparent 50%),
        radial-gradient(ellipse 50% 50% at 90% 80%, rgba(59, 130, 246, 0.3) 0%, transparent 45%);
    animation: backgroundPulse 15s ease-in-out infinite alternate;
    z-index: -2;
    pointer-events: none;
    will-change: transform;
    transform: translateY(calc(var(--parallax-y1, 0px) * -1));
}

body::after {
    content: '';
    position: fixed;
    top: -20%;
    left: -20%;
    width: 140%;
    height: 160%;
    background: 
        radial-gradient(circle at 0% 100%, rgba(59, 130, 246, 0.4) 0%, transparent 40%),
        radial-gradient(circle at 100% 0%, rgba(96, 165, 250, 0.35) 0%, transparent 40%),
        radial-gradient(circle at 80% 90%, rgba(29, 78, 216, 0.25) 0%, transparent 35%),
        radial-gradient(circle at 20% 20%, rgba(59, 130, 246, 0.2) 0%, transparent 30%);
    animation: backgroundFloat 25s ease-in-out infinite;
    z-index: -1;
    pointer-events: none;
    will-change: transform;
    transform: translateY(calc(var(--parallax-y2, 0px) * -1));
}

@keyframes backgroundPulse {
    0% { opacity: 0.7; transform: scale(1); }
    100% { opacity: 1; transform: scale(1.05); }
}

@keyframes backgroundFloat {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    25% { transform: translate(3%, 2%) rotate(2deg); }
    50% { transform: translate(-1%, 4%) rotate(-1deg); }
    75% { transform: translate(-3%, 1%) rotate(1deg); }
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ========================================
   GLASS COMPONENTS
   ======================================== */

.glass-card {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    box-shadow: var(--shadow-glass);
    transition: all var(--transition-normal);
}

.glass-card:hover {
    background: var(--glass-bg-hover);
    border-color: var(--glass-border-hover);
    box-shadow: var(--shadow-glass-hover);
}

/* ========================================
   NAVIGATION
   ======================================== */

.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: 1rem 0;
    transition: all var(--transition-normal);
}

.nav.scrolled {
    background: rgba(10, 10, 26, 0.8);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-bottom: 1px solid var(--glass-border);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    transition: all var(--transition-fast);
    position: relative;
}

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

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

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

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 5px;
}

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

/* ========================================
   HEADER / HERO SECTION
   ======================================== */

.header {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
    overflow: hidden;
    padding: 2rem;
}



.profile-card {
    position: relative;
    z-index: 1;
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur-strong);
    -webkit-backdrop-filter: var(--glass-blur-strong);
    border: 1px solid var(--glass-border);
    border-radius: 32px;
    padding: 4rem 3rem;
    max-width: 600px;
    width: 100%;
    box-shadow: 
        var(--shadow-glass),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
    animation: cardFloat 8s ease-in-out infinite;
    transition: transform 0.1s ease;
    will-change: transform;
}

.profile-card::before {
    content: '';
    position: absolute;
    inset: -1px;
    background: var(--accent-gradient);
    border-radius: 33px;
    opacity: 0;
    z-index: -1;
    transition: opacity var(--transition-normal);
}

.profile-card:hover::before {
    opacity: 0.1;
}

@keyframes cardFloat {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-12px); }
}

.profile-image-wrapper {
    position: relative;
    width: 160px;
    height: 160px;
    margin: 0 auto 2rem;
}

.profile-image {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    overflow: hidden;
    border: 3px solid var(--glass-border);
    position: relative;
    z-index: 2;
    box-shadow: 
        0 0 0 4px rgba(59, 130, 246, 0.2),
        0 0 40px rgba(59, 130, 246, 0.3);
    animation: imagePulse 5s ease-in-out infinite;
}

.profile-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center 30%;
    transform: scale(1.1);
}

@keyframes imagePulse {
    0%, 100% { 
        box-shadow: 
            0 0 0 4px rgba(59, 130, 246, 0.2),
            0 0 40px rgba(59, 130, 246, 0.3);
    }
    50% { 
        box-shadow: 
            0 0 0 6px rgba(0, 212, 255, 0.2),
            0 0 60px rgba(0, 212, 255, 0.4);
    }
}

.profile-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 200px;
    height: 200px;
    background: radial-gradient(circle, rgba(59, 130, 246, 0.3), transparent 70%);
    animation: glowPulse 5s ease-in-out infinite;
    z-index: 1;
}

@keyframes glowPulse {
    0%, 100% { 
        opacity: 0.5; 
        transform: translate(-50%, -50%) scale(1); 
    }
    50% { 
        opacity: 0.8; 
        transform: translate(-50%, -50%) scale(1.2); 
    }
}

.glitch-text {
    font-size: 2.5rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
    letter-spacing: 1px;
    animation: nameGlow 4s ease-in-out infinite;
}

@keyframes nameGlow {
    0%, 100% { 
        filter: brightness(1) drop-shadow(0 0 20px rgba(59, 130, 246, 0.3));
    }
    50% { 
        filter: brightness(1.1) drop-shadow(0 0 30px rgba(0, 212, 255, 0.4));
    }
}

.typewriter {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 3rem;
}

.typewriter h2 {
    font-size: 1.1rem;
    color: var(--text-secondary);
    font-weight: 400;
    margin-bottom: 2rem;
    position: relative;
    white-space: nowrap;
    overflow: hidden;
    animation: typing 2s steps(20, end), fadeIn 0.5s ease-out;
}

.typewriter h2::after {
    content: '|';
    position: absolute;
    right: -8px;
    color: var(--accent-primary);
    animation: cursor 1s infinite;
    font-weight: 300;
}

@keyframes typing {
    from { width: 0 }
    to { width: 100% }
}

@keyframes cursor {
    0%, 100% { opacity: 1; }
    50% { opacity: 0; }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.social-links {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
}

.social-icon {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 48px;
    height: 48px;
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: 50%;
    color: var(--text-primary);
    font-size: 18px;
    text-decoration: none;
    transition: all var(--transition-normal);
}

.social-icon:hover {
    transform: translateY(-4px) scale(1.1);
    background: var(--accent-gradient);
    border-color: transparent;
    box-shadow: var(--shadow-glow);
}

.social-icon i {
    transition: transform var(--transition-fast);
}

.social-icon:hover i {
    transform: scale(1.1);
}

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
    text-align: center;
}

.mouse {
    width: 26px;
    height: 44px;
    border: 2px solid var(--text-muted);
    border-radius: 13px;
    position: relative;
    margin: 0 auto 0.75rem;
}

.mouse::before {
    content: '';
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 8px;
    background: var(--accent-primary);
    border-radius: 2px;
    animation: scroll 2s infinite;
}

@keyframes scroll {
    0% { opacity: 1; transform: translateX(-50%) translateY(0); }
    100% { opacity: 0; transform: translateX(-50%) translateY(16px); }
}

.scroll-indicator p {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 2px;
}

/* ========================================
   SECTION TITLES
   ======================================== */

section h2 {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 1rem;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    text-align: center;
    color: var(--text-muted);
    font-size: 1.1rem;
    margin-bottom: 3rem;
}

/* ========================================
   SERVICES SECTION
   ======================================== */

.services {
    padding: 100px 0;
    position: relative;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.service-card {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 2.5rem 2rem;
    text-align: center;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.05), transparent);
    transition: left 0.6s ease;
}

.service-card:hover::before {
    left: 100%;
}

.service-card:hover {
    transform: translateY(-8px);
    border-color: var(--glass-border-hover);
    box-shadow: 
        var(--shadow-glass-hover),
        0 0 40px rgba(59, 130, 246, 0.15);
}

.service-card i {
    font-size: 3rem;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 1.25rem;
    display: block;
    transition: all var(--transition-normal);
}

.service-card:hover i {
    transform: scale(1.15);
    filter: drop-shadow(0 0 20px rgba(59, 130, 246, 0.5));
}

.service-card h3 {
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

.service-card p {
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* ========================================
   PRODUCTS SECTION
   ======================================== */

.products {
    padding: 100px 0;
    position: relative;
}

.featured-products {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
    margin-bottom: 30px;
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
}

.product-card {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 2.5rem;
    text-align: center;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.product-card::after {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--accent-gradient);
    opacity: 0;
    transition: opacity var(--transition-normal);
    z-index: 0;
}

.product-card:hover {
    transform: translateY(-10px);
    border-color: var(--accent-primary);
    box-shadow: 
        0 20px 60px rgba(0, 0, 0, 0.4),
        0 0 60px rgba(59, 130, 246, 0.2);
}

.product-card:hover::after {
    opacity: 0.05;
}

.product-card > * {
    position: relative;
    z-index: 1;
}

/* Favorite Product Highlight */
.product-card.favorite {
    border-color: rgba(251, 191, 36, 0.4);
    box-shadow: 
        var(--shadow-glass),
        0 0 30px rgba(251, 191, 36, 0.15);
}

.product-card.favorite:hover {
    border-color: rgba(251, 191, 36, 0.6);
    box-shadow: 
        0 20px 60px rgba(0, 0, 0, 0.4),
        0 0 60px rgba(251, 191, 36, 0.25);
}

.favorite-badge {
    position: absolute;
    top: 16px;
    right: 16px;
    background: linear-gradient(135deg, #F59E0B 0%, #FBBF24 100%);
    color: #1a1a2e;
    font-size: 0.7rem;
    font-weight: 600;
    padding: 4px 10px;
    border-radius: 20px;
    display: flex;
    align-items: center;
    gap: 4px;
    z-index: 2;
    box-shadow: 0 4px 15px rgba(251, 191, 36, 0.4);
}

.favorite-badge i {
    font-size: 0.65rem;
}

.product-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
    background: var(--accent-gradient);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: white;
    box-shadow: 0 8px 32px rgba(59, 130, 246, 0.3);
    transition: all var(--transition-normal);
}

.product-card:hover .product-icon {
    transform: scale(1.1) rotate(5deg);
    box-shadow: 0 12px 40px rgba(59, 130, 246, 0.4);
}

.product-icon img {
    width: 48px;
    height: 48px;
    object-fit: contain;
}

.product-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

.product-description {
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

.product-tags {
    display: flex;
    justify-content: center;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 1.5rem;
}

.product-tag {
    padding: 4px 12px;
    background: rgba(59, 130, 246, 0.15);
    border: 1px solid rgba(59, 130, 246, 0.3);
    border-radius: 20px;
    font-size: 0.75rem;
    color: var(--accent-primary);
    font-weight: 500;
}

.product-links {
    display: flex;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
}

.product-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    background: var(--accent-gradient);
    border-radius: 12px;
    color: white;
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
    transition: all var(--transition-normal);
    border: none;
}

.product-link:hover {
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 8px 30px rgba(59, 130, 246, 0.4);
}

.product-link.secondary {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
}

.product-link.secondary:hover {
    background: var(--glass-bg-hover);
    border-color: var(--accent-primary);
}

/* ========================================
   SKILLS SECTION
   ======================================== */

.skills {
    padding: 100px 0;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 20px;
}

.skill-card {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 2rem 1.5rem;
    text-align: center;
    transition: all var(--transition-normal);
    opacity: 0;
    transform: translateY(20px);
}

.skill-card.visible {
    opacity: 1;
    transform: translateY(0);
}

.skill-card:hover {
    transform: translateY(-6px);
    border-color: var(--glass-border-hover);
    box-shadow: 
        var(--shadow-glass-hover),
        0 0 30px rgba(59, 130, 246, 0.15);
}

.skill-card i,
.skill-card .devicon-typescript-plain {
    font-size: 2.5rem;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 1rem;
    display: block;
    transition: all var(--transition-normal);
}

.skill-card:hover i,
.skill-card:hover .devicon-typescript-plain {
    transform: scale(1.15);
    filter: drop-shadow(0 0 15px rgba(59, 130, 246, 0.5));
}

.skill-card h3 {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-primary);
}

/* ========================================
   CONTACT SECTION
   ======================================== */

.contact {
    padding: 100px 0;
}

.contact-info {
    display: flex;
    justify-content: center;
    gap: 48px;
    margin-bottom: 48px;
    flex-wrap: wrap;
}

.info-item {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--text-secondary);
}

.info-item i {
    font-size: 1.25rem;
    color: var(--accent-primary);
}

form {
    max-width: 700px;
    width: 100%;
    margin: 0 auto;
}

.form-group {
    margin-bottom: 24px;
}

input,
textarea {
    width: 100%;
    padding: 16px 20px;
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    font-family: inherit;
    font-size: 1rem;
    color: var(--text-primary);
    transition: all var(--transition-normal);
}

input::placeholder,
textarea::placeholder {
    color: var(--text-muted);
}

input:hover,
textarea:hover {
    border-color: var(--glass-border-hover);
}

input:focus,
textarea:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

textarea {
    height: 180px;
    resize: vertical;
    min-height: 120px;
}

.submit-btn {
    display: block;
    width: 100%;
    padding: 16px;
    background: var(--accent-gradient);
    background-size: 200% 200%;
    animation: gradientShift 5s ease infinite;
    color: white;
    border: none;
    border-radius: 16px;
    font-family: inherit;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(59, 130, 246, 0.4);
}

@keyframes gradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

/* ========================================
   UTILITY COMPONENTS
   ======================================== */

/* Loading Screen */
.loading {
    position: fixed;
    inset: 0;
    background: var(--bg-primary);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.loading.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.loader {
    width: 48px;
    height: 48px;
    border: 3px solid var(--glass-border);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Back to Top Button */
.back-to-top {
    position: fixed;
    bottom: 24px;
    right: 24px;
    width: 48px;
    height: 48px;
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: 50%;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    transform: translateY(20px);
    transition: all var(--transition-normal);
    z-index: 99;
}

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

.back-to-top:hover {
    background: var(--accent-gradient);
    border-color: transparent;
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
}

/* Scroll Progress Bar */
.scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    width: 0%;
    height: 3px;
    background: var(--accent-gradient);
    z-index: 1000;
    transition: width 0.1s ease;
}

/* ========================================
   RESPONSIVE DESIGN
   ======================================== */

@media (max-width: 1200px) {
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .skills-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

@media (max-width: 992px) {
    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: rgba(10, 10, 26, 0.98);
        backdrop-filter: var(--glass-blur);
        -webkit-backdrop-filter: var(--glass-blur);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 2rem;
        transition: right var(--transition-normal);
    }
    
    .nav-links.active {
        right: 0;
    }
    
    .nav-toggle {
        display: flex;
        z-index: 101;
    }
    
    .skills-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 768px) {
    section h2 {
        font-size: 2rem;
    }
    
    .featured-products {
        grid-template-columns: 1fr;
    }
    
    .profile-card {
        padding: 2.5rem 1.5rem;
    }
    
    .profile-image-wrapper {
        width: 120px;
        height: 120px;
    }
    
    .glitch-text {
        font-size: 1.8rem;
    }
    
    .services-grid {
        grid-template-columns: 1fr;
        max-width: 400px;
        margin: 0 auto;
    }
    
    .products-grid {
        grid-template-columns: 1fr;
        max-width: 400px;
        margin: 0 auto;
    }
    
    .skills-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .contact-info {
        flex-direction: column;
        align-items: center;
        gap: 16px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    
    .profile-card {
        padding: 2rem 1.25rem;
        border-radius: 24px;
    }
    
    .glitch-text {
        font-size: 1.5rem;
    }
    
    .social-links {
        gap: 10px;
    }
    
    .social-icon {
        width: 42px;
        height: 42px;
        font-size: 16px;
    }
    
    .service-card,
    .product-card {
        padding: 2rem 1.5rem;
    }
    
    .skills-grid {
        grid-template-columns: 1fr;
        max-width: 280px;
        margin: 0 auto;
    }
}

/* ========================================
   ACCESSIBILITY
   ======================================== */

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    html {
        scroll-behavior: auto;
    }
}

/* Focus styles for accessibility */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}