/* ========================================
   MBT SEO Consulting - Main Stylesheet
   ======================================== */

/* CSS Variables */
:root {
    --primary: #0f4c81;
    --primary-dark: #0a3459;
    --primary-light: #1a6bb5;
    --accent: #e85d04;
    --accent-light: #ff7b2e;
    --success: #22c55e;
    --bg-white: #ffffff;
    --bg-light: #f8fafc;
    --bg-alt: #f1f5f9;
    --text-dark: #1e293b;
    --text-body: #475569;
    --text-muted: #64748b;
    --text-light: #94a3b8;
    --border: #e2e8f0;
    --border-light: #f1f5f9;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.06);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.1), 0 4px 6px rgba(0,0,0,0.05);
    --shadow-xl: 0 20px 25px rgba(0,0,0,0.1), 0 10px 10px rgba(0,0,0,0.04);
    --radius-sm: 0.375rem;
    --radius: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --transition: all 0.2s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-body);
    background-color: var(--bg-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.mono {
    font-family: 'JetBrains Mono', monospace;
}

/* Container */
.container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    color: var(--text-dark);
    font-weight: 700;
    line-height: 1.2;
}

h1 { font-size: 3.5rem; }
h2 { font-size: 2.5rem; }
h3 { font-size: 1.25rem; }

p { margin-bottom: 1rem; }

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

/* Utility Classes */
.text-primary { color: var(--primary); }
.text-accent { color: var(--accent); }
.text-success { color: var(--success); }
.accent { color: var(--accent); }

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.625rem 1.5rem;
    font-family: inherit;
    font-size: 0.875rem;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: var(--transition);
}

.btn svg {
    transition: transform 0.2s ease;
}

.btn:hover svg {
    transform: translateX(4px);
}

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

.btn-primary:hover {
    background-color: var(--accent-light);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(232, 93, 4, 0.3);
}

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

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

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

.btn-white:hover {
    background: var(--bg-light);
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1rem;
}

.btn-full {
    width: 100%;
}

/* Badges */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.75rem;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 9999px;
}

.badge-success {
    background-color: rgba(34, 197, 94, 0.1);
    color: var(--success);
}

/* Icon Box */
.icon-box {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
    background-color: rgba(15, 76, 129, 0.08);
    border-radius: var(--radius-lg);
    color: var(--primary);
}

/* ========================================
   Navigation
   ======================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: transparent;
    transition: var(--transition);
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    border-bottom: 1px solid var(--border-light);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 1.25rem;
    padding-bottom: 1.25rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-dark);
}

.logo-icon {
    width: 2.5rem;
    height: 2.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--primary);
    color: white;
    font-weight: 700;
    font-size: 1.25rem;
    border-radius: var(--radius-lg);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 2.5rem;
}

.nav-link {
    position: relative;
    font-size: 0.875rem;
    color: var(--text-muted);
    transition: var(--transition);
}

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

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

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

.nav-cta {
    display: none;
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 0.5rem;
    background: none;
    border: none;
    cursor: pointer;
}

.mobile-menu-btn span {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--text-dark);
    transition: var(--transition);
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, var(--bg-light) 0%, var(--bg-white) 50%, var(--bg-alt) 100%);
    padding-top: 6rem;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 5rem;
    align-items: center;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.5rem 1rem;
    background: white;
    border: 1px solid var(--border);
    border-radius: 9999px;
    box-shadow: var(--shadow-sm);
    margin-bottom: 2rem;
}

.status-dot {
    width: 0.5rem;
    height: 0.5rem;
    background-color: var(--success);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

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

.hero-badge span:last-child {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.hero-title {
    font-size: 4rem;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    color: var(--text-dark);
}

.hero-description {
    font-size: 1.125rem;
    color: var(--text-muted);
    margin-bottom: 2.5rem;
    max-width: 32rem;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    margin-bottom: 3rem;
}

.hero-features {
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border);
}

.hero-feature {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.hero-feature strong {
    display: block;
    font-size: 0.875rem;
    color: var(--text-dark);
}

.hero-feature span {
    display: block;
    font-size: 0.75rem;
    color: var(--text-light);
}

/* Hero Visual */
.hero-visual {
    position: relative;
}

.chart-card {
    position: relative;
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: 2rem;
    box-shadow: var(--shadow-lg);
}

.chart-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.5rem;
}

.chart-header span:first-child {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.chart-bars {
    display: flex;
    align-items: flex-end;
    gap: 0.75rem;
    height: 14rem;
    margin-bottom: 1rem;
}

.bar {
    flex: 1;
    background-color: var(--primary);
    border-radius: var(--radius-sm) var(--radius-sm) 0 0;
    transition: var(--transition);
    min-height: 10%;
}

.bar:hover {
    background-color: var(--primary-dark);
}

.chart-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.625rem;
    color: var(--text-light);
}

.chart-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-light);
}

.chart-stat strong {
    display: block;
    font-size: 1.5rem;
    color: var(--text-dark);
}

.chart-stat span {
    font-size: 0.75rem;
    color: var(--text-light);
}

.live-badge {
    position: absolute;
    top: -0.75rem;
    right: -0.75rem;
    padding: 0.5rem 1rem;
    background-color: var(--accent);
    color: white;
    font-size: 0.75rem;
    font-weight: 700;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: 2.5rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-light);
}

.scroll-indicator span {
    font-size: 0.75rem;
}

.scroll-indicator svg {
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(5px); }
}

/* ========================================
   Stats Section
   ======================================== */
.stats-section {
    background-color: var(--primary);
    padding: 5rem 0;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
}

.stat-card {
    text-align: center;
    padding: 2rem;
}

.stat-number {
    font-size: 3rem;
    font-weight: 700;
    color: white;
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 1rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 0.25rem;
}

.stat-sublabel {
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.6);
}

/* ========================================
   Services Section
   ======================================== */
.services-section {
    padding: 6rem 0;
}

.section-header {
    max-width: 40rem;
    margin-bottom: 3rem;
}

.section-header.center {
    text-align: center;
    margin-left: auto;
    margin-right: auto;
}

.section-label {
    display: inline-block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 1rem;
}

.section-title {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.section-description {
    color: var(--text-muted);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.service-card {
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: 2rem;
    transition: var(--transition);
    cursor: pointer;
}

.service-card:hover {
    border-color: var(--primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.service-icon {
    width: 3.5rem;
    height: 3.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(15, 76, 129, 0.08);
    border-radius: var(--radius-xl);
    margin-bottom: 1.5rem;
    color: var(--primary);
    transition: var(--transition);
}

.service-card:hover .service-icon {
    background: rgba(15, 76, 129, 0.12);
}

.service-card h3 {
    margin-bottom: 0.75rem;
}

.service-card p {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin: 0;
}

/* ========================================
   Results Section
   ======================================== */
.results-section {
    padding: 6rem 0;
    background-color: var(--bg-light);
}

.results-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.result-card {
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    overflow: hidden;
    transition: var(--transition);
    cursor: pointer;
}

.result-card:hover {
    border-color: var(--primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.result-image {
    position: relative;
    height: 12rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--bg-light), var(--bg-alt));
    color: rgba(15, 76, 129, 0.3);
}

.result-image-green {
    color: rgba(34, 197, 94, 0.3);
}

.result-image-blue {
    color: rgba(59, 130, 246, 0.3);
}

.result-industry {
    position: absolute;
    top: 1rem;
    left: 1rem;
    padding: 0.375rem 0.75rem;
    background: white;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-muted);
    border-radius: 9999px;
    box-shadow: var(--shadow-sm);
}

.result-content {
    padding: 1.5rem;
}

.result-content h3 {
    margin-bottom: 1rem;
}

.result-stats {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.result-number {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
}

.result-number-green {
    color: var(--success);
}

.result-number-blue {
    color: #3b82f6;
}

.result-period {
    font-size: 0.875rem;
    color: var(--text-light);
}

.results-cta {
    text-align: center;
    margin-top: 3rem;
}

/* ========================================
   About Section
   ======================================== */
.about-section {
    padding: 6rem 0;
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.about-content p {
    color: var(--text-muted);
    margin-bottom: 1.5rem;
}

.about-badges {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-top: 2rem;
}

.about-badge {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 1.5rem;
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
}

.about-badge svg {
    color: var(--primary);
    flex-shrink: 0;
}

.about-badge strong {
    display: block;
    color: var(--text-dark);
    margin-bottom: 0.25rem;
}

.about-badge span {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.about-process {
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: 2rem;
}

.about-process h3 {
    margin-bottom: 1.5rem;
}

.process-steps {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.process-step {
    display: flex;
    gap: 1rem;
}

.step-number {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--accent);
}

.process-step strong {
    display: block;
    color: var(--text-dark);
    margin-bottom: 0.25rem;
}

.process-step span {
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* ========================================
   Testimonials Section
   ======================================== */
.testimonials-section {
    padding: 6rem 0;
    background-color: var(--bg-light);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.testimonial-card {
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: 2rem;
}

.testimonial-stars {
    display: flex;
    gap: 0.25rem;
    margin-bottom: 1.5rem;
}

.testimonial-card p {
    color: var(--text-muted);
    margin-bottom: 1.5rem;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-light);
}

.author-avatar {
    width: 3rem;
    height: 3rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--primary);
    color: white;
    font-weight: 700;
    font-size: 1.125rem;
    border-radius: 50%;
}

.testimonial-author strong {
    display: block;
    color: var(--text-dark);
}

.testimonial-author span {
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* ========================================
   FAQ Section
   ======================================== */
.faq-section {
    padding: 6rem 0;
}

.faq-container {
    max-width: 48rem;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.faq-item {
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    overflow: hidden;
}

.faq-question {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 1.25rem 1.5rem;
    background: none;
    border: none;
    font-family: inherit;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-dark);
    text-align: left;
    cursor: pointer;
    transition: var(--transition);
}

.faq-question:hover {
    background-color: var(--bg-light);
}

.faq-question svg {
    color: var(--accent);
    transition: transform 0.3s ease;
    flex-shrink: 0;
}

.faq-item.active .faq-question svg {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq-item.active .faq-answer {
    max-height: 300px;
}

.faq-answer p {
    padding: 0 1.5rem 1.5rem;
    color: var(--text-muted);
    margin: 0;
}

/* ========================================
   CTA Section
   ======================================== */
.cta-section {
    padding: 5rem 0;
    background-color: var(--primary);
}

.cta-content {
    text-align: center;
    max-width: 40rem;
    margin: 0 auto;
}

.cta-content h2 {
    font-size: 2rem;
    color: white;
    margin-bottom: 1rem;
}

.cta-content p {
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 2rem;
}

/* ========================================
   Contact Section
   ======================================== */
.contact-section {
    padding: 6rem 0;
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
}

.contact-info p {
    color: var(--text-muted);
    margin-bottom: 2.5rem;
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.contact-icon {
    width: 3rem;
    height: 3rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(15, 76, 129, 0.08);
    border-radius: var(--radius-xl);
    color: var(--primary);
}

.contact-item span {
    display: block;
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 0.125rem;
}

.contact-item strong {
    color: var(--text-dark);
}

.contact-form-container {
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: 2rem;
}

.contact-form-container h3 {
    margin-bottom: 1.5rem;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    background-color: var(--bg-light);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    font-family: inherit;
    font-size: 1rem;
    color: var(--text-dark);
    transition: var(--transition);
}

.form-group textarea {
    resize: none;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(15, 76, 129, 0.1);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-light);
}

.form-message {
    padding: 1rem;
    border-radius: var(--radius-lg);
    display: none;
}

.form-message.success {
    display: block;
    background-color: rgba(34, 197, 94, 0.1);
    color: var(--success);
}

.form-message.error {
    display: block;
    background-color: rgba(239, 68, 68, 0.1);
    color: #ef4444;
}

/* ========================================
   Footer
   ======================================== */
.footer {
    padding: 3rem 0;
    background-color: var(--bg-light);
    border-top: 1px solid var(--border);
}

.footer-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 1.5rem;
}

.footer-brand .logo {
    font-size: 1rem;
}

.footer-brand .logo-icon {
    width: 2rem;
    height: 2rem;
    font-size: 1rem;
}

.footer-copyright {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin: 0;
}

.footer-links {
    display: flex;
    gap: 1.5rem;
}

.footer-links a {
    font-size: 0.875rem;
    color: var(--text-muted);
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--text-dark);
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 1024px) {
    .hero-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    
    .hero-visual {
        max-width: 32rem;
        margin: 0 auto;
    }
    
    .hero-title {
        font-size: 3rem;
    }
    
    .services-grid,
    .results-grid,
    .testimonials-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .about-grid,
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
}

@media (max-width: 768px) {
    h1 { font-size: 2.5rem; }
    h2 { font-size: 2rem; }
    
    .nav-links,
    .nav-cta {
        display: none;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .hero-features {
        flex-direction: column;
        gap: 1.5rem;
    }
    
    .services-grid,
    .results-grid,
    .testimonials-grid {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: 1fr 1fr;
    }
    
    .stat-number {
        font-size: 2.5rem;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .about-badges {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .chart-bars {
        height: 10rem;
    }
    
    .chart-stats {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
}

/* Mobile Navigation Menu */
.nav-links.mobile-open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: white;
    padding: 1.5rem;
    border-top: 1px solid var(--border);
    box-shadow: var(--shadow-lg);
    gap: 1rem;
}

.nav-links.mobile-open .nav-link {
    padding: 0.75rem 0;
}

.mobile-menu-btn.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-btn.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-btn.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}