:root {

    --primary-bg: #fafafa;
    --secondary-bg: #f5f5f7;
    --accent-bg: #ffffff;
    --card-bg: #ffffff;
    --primary-text: #1d1d1f;
    --secondary-text: #86868b;
    --accent-text: #007aff;
    --border-color: #d2d2d7;
    --glass-bg: rgba(255, 255, 255, 0.8);
    --glass-border: rgba(0, 0, 0, 0.1);
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    --shadow-hover: 0 8px 40px rgba(0, 0, 0, 0.12);
    --gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --success-color: #30d158;
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-xxl: 48px;
    --border-radius-sm: 8px;
    --border-radius-md: 12px;
    --border-radius-lg: 20px;
    --border-radius-xl: 24px;
    --font-system: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Helvetica Neue', Helvetica, Arial, sans-serif;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

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

/* Subtle background gradient */
.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 25% 75%, rgba(102, 126, 234, 0.20) 0%, transparent 55%),
        radial-gradient(circle at 75% 25%, rgba(118, 75, 162, 0.15) 0%, transparent 60%),
        linear-gradient(45deg, rgba(0, 122, 255, 0.08) 0%, transparent 70%);
    mask: linear-gradient(to bottom, 
        black 0%, 
        black 70%, 
        rgba(0,0,0,0.8) 80%, 
        rgba(0,0,0,0.4) 90%, 
        transparent 100%
    );
    -webkit-mask: linear-gradient(to bottom, 
        black 0%, 
        black 70%, 
        rgba(0,0,0,0.8) 80%, 
        rgba(0,0,0,0.4) 90%, 
        transparent 100%
    );
    z-index: 1;
    animation: heroGlow 8s ease-in-out infinite;
    pointer-events: none;
}

.hero-video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.25;
    z-index: 2;
    pointer-events: none;
    mix-blend-mode: overlay; /* Mistura com o gradiente */
    mask: linear-gradient(to bottom, 
        black 0%, 
        black 70%, 
        rgba(0,0,0,0.8) 80%, 
        rgba(0,0,0,0.4) 90%, 
        transparent 100%
    );
}

/* ONLY for About page */
.about-container {
    position: relative;
    max-width: 900px;
    margin: 120px auto 80px; /* O que já tens */
    padding: 0 var(--spacing-lg);
}

.about-container::before {
    content: '';
    position: fixed; /* ← Fixed em vez de absolute */
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: 
        radial-gradient(circle at 25% 75%, rgba(102, 126, 234, 0.08) 0%, transparent 55%),
        radial-gradient(circle at 75% 25%, rgba(118, 75, 162, 0.05) 0%, transparent 60%);
    z-index: -1; /* ← Atrás de tudo */
    animation: heroGlow 8s ease-in-out infinite;
    pointer-events: none;
}

/* ONLY for Contact page */
.contact-container {
    position: relative;
    max-width: 700px;
    margin: 120px auto 80px; /* O que já tens */
    padding: 0 var(--spacing-lg);
}

.contact-container::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: 
        radial-gradient(circle at 25% 75%, rgba(102, 126, 234, 0.08) 0%, transparent 55%),
        radial-gradient(circle at 75% 25%, rgba(118, 75, 162, 0.05) 0%, transparent 60%);
    z-index: -1;
    animation: heroGlow 8s ease-in-out infinite;
    pointer-events: none;
}


.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* Style Navigation */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(250, 250, 250, 0.8);
    -webkit-backdrop-filter: blur(20px);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    padding: 12px 0;
    z-index: 1000;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.nav-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    font-size: 20px;
    font-weight: 600;
    color: var(--primary-text);
    text-decoration: none;
    letter-spacing: -0.02em;
}

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

.nav-links a {
    color: var(--secondary-text);
    text-decoration: none;
    font-size: 17px;
    font-weight: 400;
    transition: color 0.3s ease;
    position: relative;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--primary-text);
}

/* Style Language Toggle */
.language-toggle {
    cursor: pointer;
    -webkit-user-select: none;
    user-select: none;
    transition: transform 0.2s ease;
}

.language-toggle:active {
    transform: scale(0.95);
}

.toggle-slider {
    position: relative;
    width: 64px;
    height: 32px;
    background: var(--border-color);
    border-radius: 16px;
    display: flex;
    align-items: center;
    padding: 2px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    overflow: hidden;
}

.toggle-slider:hover {
    background: var(--secondary-text);
}

.toggle-label {
    position: relative;
    z-index: 2;
    font-size: 12px;
    font-weight: 600;
    color: var(--secondary-text);
    width: 50%;
    text-align: center;
    transition: all 0.3s ease;
    line-height: 1;
    padding: 6px 0;
}

.toggle-label.active {
    color: var(--primary-text);
    font-weight: 700;
}

.toggle-button {
    position: absolute;
    top: 2px;
    left: 2px;
    width: 28px;
    height: 28px;
    background: var(--accent-bg);
    border-radius: 14px;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
    z-index: 1;
}

.language-toggle.pt .toggle-button {
    transform: translateX(32px);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 120px var(--spacing-lg) 80px;
    position: relative;
}

.hero-content {
    max-width: 800px;
    position: relative;
    z-index: 2;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    padding: 8px 16px;
    border-radius: 50px;
    font-size: 14px;
    color: var(--secondary-text);
    margin-bottom: var(--spacing-xl);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    font-weight: 500;
}

.status-dot {
    width: 8px;
    height: 8px;
    background: var(--success-color);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { 
        opacity: 1; 
        transform: scale(1);
    }
    50% { 
        opacity: 0.6; 
        transform: scale(1.1);
    }
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4.5rem);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: var(--spacing-lg);
    letter-spacing: -0.03em;
}

.gradient-text {
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    background-size: 200% 200%;
    animation: gradientShift 4s ease-in-out infinite;
}

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

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--secondary-text);
    margin-bottom: var(--spacing-xxl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.5;
    font-weight: 400;
}

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

.btn-primary,
.btn-secondary {
    padding: 12px 24px;
    border-radius: var(--border-radius-md);
    text-decoration: none;
    font-weight: 500;
    font-size: 17px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    min-width: 140px;
    text-align: center;
}

.btn-primary {
    background: var(--accent-text);
    color: white;
    border: none;
}

.btn-primary:hover {
    background: #0056cc;
    transform: translateY(-1px);
    box-shadow: 0 8px 25px rgba(0, 122, 255, 0.25);
}

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

.btn-secondary:hover {
    background: var(--accent-text);
    color: white;
    transform: translateY(-1px);
}

.hero-scroll {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    z-index: 5;
}

.scroll-indicator {
    width: 1px;
    height: 40px;
    background: linear-gradient(
        to bottom, 
        transparent 0%, 
        var(--secondary-text) 20%, 
        var(--accent-text) 50%, 
        var(--secondary-text) 80%, 
        transparent 100%
    );
    border-radius: 1px;
    position: relative;
    animation: scrollPulse 3s ease-in-out infinite;
}

.scroll-indicator::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 12px;
    background: var(--accent-text);
    border-radius: 1px;
    animation: scrollDot 3s ease-in-out infinite;
}

@keyframes scrollPulse {
    0%, 100% { 
        opacity: 0.5;
    }
    50% { 
        opacity: 1;
    }
}

@keyframes scrollDot {
    0% {
        transform: translateY(0);
        opacity: 0;
    }
    20% {
        opacity: 1;
    }
    80% {
        opacity: 1;
    }
    100% {
        transform: translateY(28px);
        opacity: 0;
    }
}

/* Work Section */
.work-section {
    padding: 80px 0;
    position: relative;
}

.project-category {
    margin-bottom: 120px;
}

.category-header {
    margin-bottom: var(--spacing-xxl);

}

.category-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.02em;
    color: var(--primary-text);
}

.category-desc {
    font-size: 1.25rem;
    color: var(--secondary-text);
    max-width: 800px;
    font-weight: 400;
}

/* UX/UI Project Grid */
.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-xl);
}

.project-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-xl);
    overflow: hidden;
    cursor: pointer;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    will-change: transform;
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-hover);
    border-color: var(--accent-text);
}

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

.project-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

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

.project-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

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

.view-project {
    color: white;
    font-weight: 500;
    padding: 12px 24px;
    background: var(--accent-text);
    border-radius: var(--border-radius-md);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    border: none;
}

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

.project-info h4 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--primary-text);
}

.project-tag {
    color: var(--secondary-text);
    font-size: 0.875rem;
    font-weight: 500;
}

/* Product & Flyer Grids */
.print-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.print-card {
    aspect-ratio: 1;
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

.print-card:hover {
    transform: scale(1.03) translateY(-4px);
    box-shadow: var(--shadow-hover);
}

.print-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* Brand Grid */
.brand-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
}

.brand-card {
    aspect-ratio: 1;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-xl);
    overflow: hidden;
    cursor: pointer;
    position: relative;
    transition: all 0.3s ease;
    box-shadow: var(--shadow);
}

.brand-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent-text);
    box-shadow: var(--shadow-hover);
}

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

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

.brand-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(rgba(1, 1, 1, 1), rgba(1, 1, 1, 1));
    padding: var(--spacing-lg);
    transform: translateY(100%);
    transition: transform 0.3s ease;
}

.brand-card:hover .brand-overlay {
    transform: translateY(0);
}

.brand-overlay h3 {
    color: #007aff;
}

.brand-overlay h4 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: white;
}

.brand-overlay span {
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.875rem;
}

/* Lightbox */
.lightbox {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.9);
    z-index: 2000;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
    -webkit-backdrop-filter: blur(20px);
    backdrop-filter: blur(20px);
}

.lightbox.active {
    display: flex;
}

.lightbox-content {
    max-width: 90vw;
    max-height: 90vh;
    position: relative;
}

.lightbox img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    border-radius: var(--border-radius-md);
}

.lightbox-close {
    position: absolute;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    width: 44px;
    height: 44px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 50%;
    color: var(--primary-text);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
}

.lightbox-close:hover {
    background: var(--secondary-bg);
    transform: scale(1.1);
}

/* About Page Styles */
.about-container {
    max-width: 900px;
    margin: 100px auto 80px;
    padding: 0 var(--spacing-lg);
}

.about-hero {
    text-align: center;
}

.about-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    letter-spacing: -0.03em;
}

.about-content {
    display: flex;
    flex-direction: column;
    gap: 60px;
}

.about-text {
    font-size: 1.25rem;
    line-height: 1.6;
    color: var(--secondary-text);
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
}

.skills-section {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-xl);
    padding: var(--spacing-xxl);
    box-shadow: var(--shadow);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xxl);
}

.skill-category h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--primary-text);
}

.skill-category ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.skill-category li {
    color: var(--secondary-text);
    font-size: 0.95rem;
    padding-left: var(--spacing-md);
    position: relative;
}

.skill-category li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--accent-text);
    font-weight: 600;
}

#skills-heading {
    margin-bottom: 16px;
}

.certifications-section {
    text-align: center;
}

.certifications-section h3 {
    font-size: 1.55rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xxl);
    color: var(--primary-text);
}

#certifications-heading {
     font-size: 1.85rem;
     margin-bottom: 32px;
}

.certifications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xxl);
}

.cert-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-lg);
    text-align: left;
    transition: all 0.3s ease;
    box-shadow: var(--shadow);
}

.cert-card:hover {
    border-color: var(--accent-text);
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

.cert-card h4 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--primary-text);
}

.cert-card p {
    color: var(--secondary-text);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-sm);
}

.cert-card span {
    color: var(--accent-text);
    font-size: 0.85rem;
    font-weight: 500;
}

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

.about-button {
    padding: 12px 24px;
    text-decoration: none;
    color: var(--accent-text);
    background: transparent;
    border: 1px solid var(--accent-text);
    border-radius: var(--border-radius-md);
    font-size: 17px;
    font-weight: 500;
    transition: all 0.3s ease;
    min-width: 140px;
    text-align: center;
}

.about-button:hover {
    background: var(--accent-text);
    color: white;
    transform: translateY(-1px);
    box-shadow: 0 8px 25px rgba(0, 122, 255, 0.25);
}

/* Contact Page Styles */
.contact-container {
    max-width: 700px;
    margin: 100px auto 80px;
    padding: 0 var(--spacing-lg);
}

.contact-hero {
    text-align: center;
    margin-bottom: 60px;
}

.contact-title {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.03em;
}

.contact-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xxl);
}

.email-container {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-xl);
    padding: var(--spacing-xxl);
    box-shadow: var(--shadow);
}

.email-label {
    font-size: 0.875rem;
    color: var(--secondary-text);
    margin-bottom: var(--spacing-sm);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 500;
}

.email-text {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-text);
    margin-bottom: var(--spacing-lg);
    word-break: break-all;
}

.copy-button {
    background: var(--accent-text);
    border: none;
    color: white;
    padding: 12px 24px;
    border-radius: var(--border-radius-md);
    font-size: 17px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: inherit;
}

.copy-button:hover {
    background: #0056cc;
    transform: translateY(-1px);
}

.copy-button.copied {
    background: var(--success-color);
}

.contact-links {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.contact-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    text-decoration: none;
    color: var(--primary-text);
    transition: all 0.3s ease;
    box-shadow: var(--shadow);
}

.contact-link:hover {
    border-color: var(--accent-text);
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

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

.link-content {
    flex: 1;
}

.link-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 2px;
}

.link-desc {
    font-size: 0.875rem;
    color: var(--secondary-text);
}

.contact-info {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-xl);
    padding: var(--spacing-xxl);
    box-shadow: var(--shadow);
}

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

.info-item h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--primary-text);
}

.info-item p {
    color: var(--secondary-text);
    font-size: 0.9rem;
}

/* Portfolio Item Pages */
.portfolio-item-container {
    margin: 100px auto 80px;
    padding: 0 var(--spacing-lg);
    max-width: 1200px;
}

.portfolio-image {
    width: 100%;
    height: auto;
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow-hover);
    border: 1px solid var(--border-color);
}

.back-button {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--secondary-text);
    text-decoration: none;
    font-size: 17px;
    margin-bottom: var(--spacing-xl);
    transition: color 0.3s ease;
    font-weight: 500;
}

.back-button:hover {
    color: var(--primary-text);
}

/* Footer */
.footer {
    padding: 60px 0;
    border-top: 1px solid var(--border-color);
}

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

.footer-content p {
    color: var(--secondary-text);
    font-size: 0.875rem;
}

/* Performance optimizations */
.project-card,
.brand-card,
.print-card {
    will-change: transform;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
}

/* Responsive Design - Mobile First */
@media (max-width: 768px) {
    .nav {
        padding: 8px 0;
    }

    .nav-content {
        padding: 0 var(--spacing-md);
        flex-direction: row;
        justify-content: space-between;
    }

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

    .nav-links a {
        font-size: 16px;
    }

    .hero {
        padding: 100px var(--spacing-md) 60px;
        min-height: 90vh;
    }

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

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

    .hero-cta {
        flex-direction: column;
        align-items: center;
        gap: var(--spacing-sm);
    }

    .btn-primary,
    .btn-secondary {
        width: 100%;
        max-width: 280px;
        padding: 14px 24px;
    }

    .container {
        padding: 0 var(--spacing-md);
    }

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

    .category-desc {
        font-size: 1.125rem;
    }

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

    .brand-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-md);
    }

    .print-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-md);
    }

    .project-category {
        margin-bottom: 80px;
    }

    .category-header {
        margin-bottom: var(--spacing-xl);
        text-align: left;
    }

    .lightbox-close {
        top: var(--spacing-md);
        right: var(--spacing-md);
    }

    /* About page mobile */
    .about-container {
        margin-top: 80px;
        padding: 0 var(--spacing-md);
    }

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

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

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

    .about-buttons {
        flex-direction: column;
        align-items: center;
    }

    .about-button {
        width: 100%;
        max-width: 280px;
    }

    /* Contact page mobile */
    .contact-container {
        margin-top: 80px;
        padding: 0 var(--spacing-md);
    }

    .email-container {
        padding: var(--spacing-xl);
    }

    .email-text {
        font-size: 1.25rem;
    }

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

    .contact-info {
        padding: var(--spacing-xl);
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }

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

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

    .about-text {
        font-size: 1.125rem;
    }

    .skills-section {
        padding: var(--spacing-lg);
    }

    .email-text {
        font-size: 1.125rem;
    }

    .category-title {
        font-size: 1.75rem;
    }
}

/* Tablet optimizations */
@media (min-width: 769px) and (max-width: 1024px) {
    .project-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .brand-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .print-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* Focus styles for accessibility */
*:focus-visible {
    outline: 2px solid var(--accent-text);
    outline-offset: 2px;
}

/* Smooth transitions for performance */
* {
    transition-duration: 0.3s;
    transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
}