/* CSS Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Color Palette */
    --primary-gradient: linear-gradient(135deg, #ff6b6b, #4ecdc4);
    --secondary-gradient: linear-gradient(135deg, #667eea, #764ba2);
    --dark-bg: #0a0a0a;
    --dark-surface: #1a1a2e;
    --dark-surface-2: #16213e;
    --dark-surface-3: #0f0f23;
    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.8);
    --text-muted: rgba(255, 255, 255, 0.6);
    --accent-color: #4ecdc4;
    --error-color: #ff6b6b;
    --success-color: #51cf66;
    --warning-color: #ffd43b;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 5rem;
    
    /* Border Radius */
    --radius-sm: 5px;
    --radius-md: 10px;
    --radius-lg: 15px;
    --radius-xl: 20px;
    --radius-2xl: 30px;
    --radius-full: 50px;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15);
    --shadow-2xl: 0 25px 50px rgba(0, 0, 0, 0.25);
    --shadow-glow: 0 0 20px rgba(255, 107, 107, 0.3);
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    --font-size-6xl: 4rem;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Breakpoints */
    --breakpoint-sm: 640px;
    --breakpoint-md: 768px;
    --breakpoint-lg: 1024px;
    --breakpoint-xl: 1280px;
}

body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--dark-bg);
    overflow-x: hidden;
    scroll-behavior: smooth;
}

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

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }

.hidden { display: none; }
.visible { display: block; }

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

/* Animated Background */
.bg-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background: linear-gradient(45deg, var(--dark-surface), var(--dark-surface-2), var(--dark-surface-3));
    background-size: 400% 400%;
}

.bg-animation::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 80%, rgba(255, 107, 107, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(78, 205, 196, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(69, 183, 209, 0.1) 0%, transparent 50%);
    opacity: 0.6;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
}

h1 { font-size: var(--font-size-5xl); }
h2 { font-size: var(--font-size-4xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }
h5 { font-size: var(--font-size-lg); }
h6 { font-size: var(--font-size-base); }

p {
    margin-bottom: var(--spacing-sm);
    color: var(--text-secondary);
}

a {
    color: var(--accent-color);
    text-decoration: none;
    transition: var(--transition-base);
}

a:hover {
    color: var(--text-primary);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: var(--font-size-base);
    font-weight: 600;
    text-decoration: none;
    border-radius: var(--radius-full);
    border: none;
    cursor: pointer;
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
    white-space: nowrap;
}

.btn-primary {
    background: var(--primary-gradient);
    color: white;
    box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 40px rgba(255, 107, 107, 0.4);
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.6);
    transform: translateY(-2px);
}

/* Section Titles */
.section-title {
    text-align: center;
    font-size: var(--font-size-4xl);
    font-weight: 800;
    margin-bottom: var(--spacing-xl);
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    position: relative;
}

.section-subtitle {
    text-align: center;
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-2xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* Navigation */
nav {
    position: fixed;
    top: 0;
    width: 100%;
    padding: var(--spacing-sm) 0;
    background: rgba(10, 10, 10, 0.9);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    z-index: 1000;
    transition: var(--transition-base);
}

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

.logo {
    font-size: var(--font-size-2xl);
    font-weight: 800;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
    align-items: center;
}

.nav-links a {
    color: var(--text-primary);
    font-weight: 500;
    transition: var(--transition-base);
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -5px;
    left: 0;
    background: var(--primary-gradient);
    transition: width var(--transition-base);
}

.nav-links a:hover::after,
.nav-links a.active::after {
    width: 100%;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    margin: 3px 0;
    transition: var(--transition-base);
    border-radius: 2px;
}

/* Language Switcher Styles */
.language-switcher {
    position: relative;
}

.lang-dropdown {
    position: relative;
}

.lang-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.9rem;
    font-weight: 500;
}

.lang-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.4);
}

.lang-btn .flag {
    font-size: 1rem;
}

.dropdown-arrow {
    font-size: 0.7rem;
    transition: transform 0.3s ease;
}

.lang-btn:hover .dropdown-arrow {
    transform: rotate(180deg);
}

.lang-options {
    position: absolute;
    top: 100%;
    right: 0;
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    padding: 0.5rem 0;
    margin-top: 0.5rem;
    min-width: 100px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    z-index: 1000;
}

.lang-options.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.lang-option {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    cursor: pointer;
    transition: background 0.2s ease;
    color: white;
    font-size: 0.9rem;
}

.lang-option:hover {
    background: rgba(255, 255, 255, 0.1);
}

.lang-option .flag {
    font-size: 1rem;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--spacing-3xl) var(--spacing-lg);
    position: relative;
}

.hero-content {
    max-width: 800px;
}

.hero h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 900;
    margin-bottom: var(--spacing-lg);
    background: linear-gradient(135deg, #ff6b6b, #4ecdc4, #45b7d1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.1;
}

.hero p {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-2xl);
    opacity: 0.9;
    line-height: 1.6;
}

.cta-buttons {
    display: flex;
    gap: var(--spacing-lg);
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: var(--spacing-3xl);
}

/* Phone Mockup */
.phone-mockup {
    width: 300px;
    height: 600px;
    background: linear-gradient(135deg, var(--dark-surface), var(--dark-surface-2));
    border-radius: var(--radius-2xl);
    padding: 20px;
    margin: var(--spacing-lg) auto;
    box-shadow: var(--shadow-2xl);
    position: relative;
    overflow: hidden;
    cursor: pointer;
    transition: var(--transition-base);
}

.phone-mockup:hover {
    transform: scale(1.02);
}

.phone-screen {
    width: 100%;
    height: 100%;
    background: #000;
    border-radius: var(--radius-lg);
    overflow: hidden;
    position: relative;
}

.demo-content {
    padding: var(--spacing-lg);
    height: 100%;
    display: flex;
    flex-direction: column;
}

.demo-header {
    text-align: center;
    padding: var(--spacing-lg) 0;
    border-bottom: 1px solid #333;
    position: relative;
}

.demo-header h4 {
    color: var(--accent-color);
    font-size: var(--font-size-lg);
}

.status-indicator {
    position: absolute;
    top: 10px;
    right: 10px;
    width: 8px;
    height: 8px;
    background: var(--success-color);
    border-radius: 50%;
}

.demo-body {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-lg);
}

.posture-demo {
    width: 100px;
    height: 100px;
    background: var(--primary-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-3xl);
    transition: var(--transition-base);
}

.status-text {
    color: var(--success-color);
    font-weight: 600;
    text-align: center;
}

.workout-status {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

.ai-suggestions {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.suggestion {
    background: rgba(78, 205, 196, 0.1);
    border: 1px solid rgba(78, 205, 196, 0.3);
    border-radius: var(--radius-md);
    padding: var(--spacing-xs);
    font-size: var(--font-size-xs);
    text-align: center;
    color: var(--accent-color);
}

/* Progress Bar */
.progress-bar {
    width: 100%;
    height: 8px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-sm);
    overflow: hidden;
    margin: var(--spacing-sm) 0;
}

.progress-fill {
    height: 100%;
    background: var(--primary-gradient);
    border-radius: var(--radius-sm);
    transition: width var(--transition-base);
}

/* Features Preview Section */
.features-preview {
    padding: var(--spacing-3xl) 0;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.feature-card {
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
    text-align: center;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--primary-gradient);
    opacity: 0;
    transition: opacity var(--transition-base);
    z-index: 0;
}

.feature-card:hover::before {
    opacity: 0.05;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
}

.feature-icon {
    width: 60px;
    height: 60px;
    background: var(--primary-gradient);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-2xl);
    margin: 0 auto var(--spacing-lg);
    position: relative;
    z-index: 1;
}

.feature-card h3 {
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    position: relative;
    z-index: 1;
}

.feature-card p {
    opacity: 0.8;
    line-height: 1.6;
    position: relative;
    z-index: 1;
    margin-bottom: var(--spacing-lg);
}

.feature-link {
    color: var(--accent-color);
    font-weight: 600;
    position: relative;
    z-index: 1;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    transition: var(--transition-base);
}

.feature-link:hover {
    transform: translateX(5px);
}

/* Stats Section */
.stats-section {
    padding: var(--spacing-3xl) 0;
    background: rgba(255, 255, 255, 0.02);
}

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

.stat-item {
    text-align: center;
    padding: var(--spacing-lg);
}

.stat-number {
    font-size: var(--font-size-5xl);
    font-weight: 900;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-sm);
}

.stat-label {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    font-weight: 500;
}

/* Quick Demo Section */
.quick-demo {
    padding: var(--spacing-3xl) 0;
}

.demo-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
}

.demo-item {
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
    transition: var(--transition-base);
    cursor: pointer;
}

.demo-item:hover {
    transform: translateY(-5px);
    background: rgba(255, 255, 255, 0.08);
}

.demo-icon {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--spacing-sm);
}

.demo-item h3 {
    color: var(--accent-color);
    margin-bottom: var(--spacing-xs);
}

.demo-item p {
    margin-bottom: var(--spacing-lg);
    font-size: var(--font-size-sm);
}

.demo-preview {
    margin: var(--spacing-lg) 0;
}

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

.demo-btn {
    background: var(--primary-gradient);
    color: white;
    border: none;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-full);
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition-base);
}

.demo-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.demo-cta {
    text-align: center;
}

/* Testimonials Section */
.testimonials {
    padding: var(--spacing-3xl) 0;
    background: rgba(255, 255, 255, 0.02);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

.testimonial-card {
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: var(--transition-base);
}

.testimonial-card:hover {
    transform: translateY(-5px);
    background: rgba(255, 255, 255, 0.08);
}

.testimonial-content {
    margin-bottom: var(--spacing-lg);
}

.testimonial-content p {
    font-style: italic;
    font-size: var(--font-size-lg);
    color: var(--text-primary);
    line-height: 1.6;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.author-avatar {
    width: 50px;
    height: 50px;
    background: var(--primary-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-xl);
}

.author-info h4 {
    margin-bottom: 0;
    font-size: var(--font-size-base);
}

.author-info span {
    color: var(--text-muted);
    font-size: var(--font-size-sm);
}

/* Download CTA Section */
.download-cta {
    padding: var(--spacing-3xl) 0;
    text-align: center;
}

.download-content h2 {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--spacing-lg);
}

.download-content p {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-2xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

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

.download-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg) var(--spacing-xl);
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-lg);
    text-decoration: none;
    color: white;
    transition: var(--transition-base);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    min-width: 180px;
}

.download-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl);
}

.download-icon {
    width: 40px;
    height: 40px;
    background: var(--primary-gradient);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-xl);
}

.download-text {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.download-label {
    font-size: var(--font-size-sm);
    opacity: 0.7;
}

.download-store {
    font-size: var(--font-size-lg);
    font-weight: 600;
}

.download-info {
    margin-top: var(--spacing-lg);
}

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

/* Footer */
footer {
    background: rgba(0, 0, 0, 0.8);
    padding: var(--spacing-3xl) 0 var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-section h4 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    font-size: var(--font-size-lg);
}

.footer-logo {
    margin-bottom: var(--spacing-lg);
}

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

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--spacing-xs);
}

.footer-links a {
    color: var(--text-secondary);
    transition: var(--transition-base);
    font-size: var(--font-size-sm);
}

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

.social-links {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-sm);
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 50%;
    transition: var(--transition-base);
    font-size: var(--font-size-lg);
}

.social-link:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

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

/* AI Assistant */
.ai-assistant {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 60px;
    height: 60px;
    background: var(--primary-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: var(--shadow-glow);
    z-index: 1000;
    transition: var(--transition-base);
    border: none;
}

.ai-assistant:hover {
    transform: scale(1.1);
}

.assistant-icon {
    font-size: var(--font-size-2xl);
    position: relative;
    z-index: 2;
}

.assistant-pulse {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: var(--primary-gradient);
    opacity: 0.7;
    z-index: 1;
}

/* Hero Phone Image Styling */
.hero-phone-image {
    width: 100%;
    height: auto;
    border-radius: 30px;
    box-shadow: 0 25px 60px rgba(0, 0, 0, 0.5);
    transition: all 0.3s ease;
}

.phone-mockup {
    position: relative;
    max-width: 300px;
    margin: 0 auto;
    animation: float 6s ease-in-out infinite;
}

.phone-mockup:hover .hero-phone-image {
    transform: scale(1.02);
    box-shadow: 0 30px 70px rgba(78, 205, 196, 0.3);
}

.phone-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 120%;
    height: 120%;
    background: radial-gradient(ellipse at center, rgba(78, 205, 196, 0.2) 0%, transparent 70%);
    z-index: -1;
    animation: pulse 4s ease-in-out infinite;
}

/* Coach Interface Styling */
.coach-showcase {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
    max-width: 1000px;
    margin: 0 auto;
}

.coach-demo-image {
    width: 100%;
    max-width: 350px;
    height: auto;
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
    transition: all 0.3s ease;
}

.coach-demo-image:hover {
    transform: translateY(-5px);
    box-shadow: 0 25px 50px rgba(78, 205, 196, 0.3);
}

.coach-features h3 {
    color: #4ecdc4;
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
}

.feature-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.feature-item {
    display: flex;
    align-items: center;
    padding: 0.75rem;
    background: rgba(78, 205, 196, 0.1);
    border-radius: 10px;
    border: 1px solid rgba(78, 205, 196, 0.2);
    color: rgba(255, 255, 255, 0.9);
}

/* Features Hero Enhanced */
.features-hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    min-height: 80vh;
}

.hero-text {
    z-index: 2;
}

.hero-visual {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.features-hero-image {
    width: 100%;
    max-width: 500px;
    height: auto;
    border-radius: 20px;
    box-shadow: 0 25px 60px rgba(0, 0, 0, 0.4);
    transition: all 0.3s ease;
}

.features-hero-image:hover {
    transform: scale(1.02);
    box-shadow: 0 30px 70px rgba(78, 205, 196, 0.3);
}

.analysis-overlay {
    position: absolute;
    top: 20px;
    right: 20px;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.accuracy-badge,
.form-badge {
    background: rgba(0, 0, 0, 0.8);
    color: #4ecdc4;
    padding: 0.75rem 1.5rem;
    border-radius: 25px;
    border: 2px solid #4ecdc4;
    font-weight: 600;
    font-size: 0.9rem;
    box-shadow: 0 0 20px rgba(78, 205, 196, 0.5);
    animation: pulse 2s ease-in-out infinite;
}

.form-badge {
    color: #51cf66;
    border-color: #51cf66;
    box-shadow: 0 0 20px rgba(81, 207, 102, 0.5);
}

/* Coach Demo Mockup */
.coach-demo-mockup {
    display: flex;
    justify-content: center;
    align-items: center;
}

.demo-phone {
    width: 300px;
    height: 600px;
    background: linear-gradient(135deg, #1a1a2e, #16213e);
    border-radius: 30px;
    padding: 20px;
    box-shadow: 0 25px 60px rgba(0, 0, 0, 0.5);
    position: relative;
    overflow: hidden;
}

.phone-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: white;
    font-size: 0.9rem;
    margin-bottom: 2rem;
}

.status-icons {
    display: flex;
    gap: 0.25rem;
}

.phone-content {
    background: #000;
    border-radius: 20px;
    height: calc(100% - 60px);
    padding: 2rem 1.5rem;
    display: flex;
    flex-direction: column;
}

.app-title {
    color: #4ecdc4;
    text-align: center;
    margin-bottom: 2rem;
    font-size: 1.5rem;
    font-weight: 800;
}

.chat-simulation {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 2rem;
}

.ai-message {
    display: flex;
    justify-content: flex-start;
}

.user-message {
    display: flex;
    justify-content: flex-end;
}

.message-bubble {
    max-width: 70%;
    padding: 1rem;
    border-radius: 15px;
    font-size: 0.9rem;
    line-height: 1.4;
}

.message-bubble.ai {
    background: rgba(78, 205, 196, 0.2);
    color: #4ecdc4;
    border: 1px solid rgba(78, 205, 196, 0.3);
}

.message-bubble.user {
    background: rgba(255, 107, 107, 0.2);
    color: #ff6b6b;
    border: 1px solid rgba(255, 107, 107, 0.3);
}

.input-simulation {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 25px;
    padding: 0.75rem 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.input-field {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9rem;
}

.send-icon {
    color: #4ecdc4;
    font-size: 1.2rem;
}

/* Contact form error states */
.form-group input.error,
.form-group select.error,
.form-group textarea.error {
    border-color: #ff6b6b;
    box-shadow: 0 0 10px rgba(255, 107, 107, 0.3);
}

.error-message {
    color: #ff6b6b;
    font-size: 0.8rem;
    margin-top: 0.25rem;
}

.character-counter {
    text-align: right;
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.6);
    margin-top: 0.25rem;
}

/* Mobile responsiveness for language switcher */
@media (max-width: 768px) {
    .lang-btn {
        padding: 0.4rem 0.8rem;
        font-size: 0.8rem;
    }
    
    .lang-options {
        right: -10px;
    }

    .nav-links.active .language-switcher {
        margin-top: 1rem;
        padding-top: 1rem;
        border-top: 1px solid rgba(255, 255, 255, 0.1);
    }

    /* Responsive for coach interface */
    .coach-showcase {
        grid-template-columns: 1fr;
        text-align: center;
    }

    /* Responsive for features hero */
    .features-hero-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 2rem;
    }
    
    .hero-visual {
        order: -1;
    }
    
    .analysis-overlay {
        position: static;
        flex-direction: row;
        justify-content: center;
        margin-top: 1rem;
    }
}