/* Landing Page Styles */
:root {
    /* Colors */
    --primary-color: #2196f3;
    --primary-hover: #1976d2;
    --secondary-color: #ff9800;
    --accent-color: #42a5f5;
    --success-color: #4caf50;
    --warning-color: #ff9800;
    --error-color: #f44336;
    
    /* Text Colors */
    --text-primary: #333333;
    --text-secondary: #6c757d;
    --text-muted: #adb5bd;
    --text-light: #ced4da;
    
    /* Background Colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #e9ecef;
    --bg-dark: #212529;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #2196f3 0%, #42a5f5 100%);
    --gradient-secondary: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    --gradient-hero: linear-gradient(135deg, #ffffff 0%, #f8f9fa 50%, #e3f2fd 100%);
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.15), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-2xl: 24px;
    
    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;
    
    /* Breakpoints */
    --bp-sm: 640px;
    --bp-md: 768px;
    --bp-lg: 1024px;
    --bp-xl: 1280px;
    --bp-2xl: 1536px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--space-4);
}

h1 {
    font-size: 3.5rem;
    font-weight: 700;
}

h2 {
    font-size: 2.5rem;
}

h3 {
    font-size: 1.875rem;
}

h4 {
    font-size: 1.5rem;
}

p {
    margin-bottom: var(--space-4);
    color: var(--text-secondary);
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.2s ease;
}

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s ease;
    white-space: nowrap;
}

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

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
    color: white;
}

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

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

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border-color: var(--bg-tertiary);
}

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

.btn-large {
    padding: var(--space-4) var(--space-8);
    font-size: 1rem;
}

.btn-full {
    width: 100%;
    justify-content: center;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-6);
}

/* Navigation */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: #ffffff;
    border-bottom: 1px solid #e0e0e0;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
    z-index: 1000;
    transition: all 0.3s ease;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-6);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-color);
}

.nav-icon {
    width: 32px;
    height: 32px;
    flex-shrink: 0;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-8);
}

.nav-link {
    color: var(--text-secondary);
    font-weight: 500;
    transition: color 0.2s ease;
}

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

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    cursor: pointer;
}

/* Hero Section */
.hero {
    padding: calc(64px + var(--space-20)) 0 var(--space-20);
    background: var(--gradient-hero);
    min-height: 100vh;
    display: flex;
    align-items: center;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-6);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-16);
    align-items: center;
}

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

.hero-title {
    font-size: 4rem;
    line-height: 1.1;
    margin-bottom: var(--space-6);
    color: var(--text-primary);
}

.hero-highlight {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-8);
    line-height: 1.6;
}

.hero-actions {
    display: flex;
    gap: var(--space-4);
    margin-bottom: var(--space-12);
}

.hero-stats {
    display: flex;
    gap: var(--space-8);
}

.stat {
    text-align: center;
}

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

.stat-label {
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* Hero Visual */
.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-app-preview {
    position: relative;
}

.app-mockup {
    background: white;
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    width: 350px;
    transform: rotate(3deg);
    transition: transform 0.3s ease;
}

.app-mockup:hover {
    transform: rotate(0deg) scale(1.05);
}

.mockup-header {
    background: var(--bg-tertiary);
    padding: var(--space-4);
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.mockup-controls {
    display: flex;
    gap: var(--space-1);
}

.mockup-controls span {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--text-light);
}

.mockup-controls span:first-child {
    background: #ef4444;
}

.mockup-controls span:nth-child(2) {
    background: #f59e0b;
}

.mockup-controls span:last-child {
    background: #10b981;
}

.mockup-title {
    font-weight: 600;
    color: var(--text-primary);
}

.mockup-content {
    padding: var(--space-6);
}

.mockup-exercise-card {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    padding: var(--space-4);
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-4);
}

.exercise-icon {
    font-size: 2rem;
}

.exercise-info h4 {
    margin: 0;
    font-size: 1rem;
    color: var(--text-primary);
}

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

.exercise-status {
    margin-left: auto;
    padding: var(--space-1) var(--space-3);
    background: var(--primary-color);
    color: white;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
}

.mockup-stats {
    display: flex;
    gap: var(--space-6);
    margin-top: var(--space-6);
}

.stat-item {
    text-align: center;
}

.stat-value {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.stat-name {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Section Styles */
section {
    padding: var(--space-20) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-16);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.section-header h2 {
    margin-bottom: var(--space-4);
}

.section-header p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 0;
}

/* Features Section */
.features {
    background: var(--bg-primary);
}

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

.feature-card {
    background: white;
    padding: var(--space-8);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.feature-icon {
    width: 80px;
    height: 80px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--space-6);
}

.feature-icon i {
    font-size: 2rem;
    color: white;
}

.feature-card h3 {
    margin-bottom: var(--space-4);
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    margin-bottom: 0;
}

/* How It Works Section */
.how-it-works {
    background: var(--bg-secondary);
}

.steps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-8);
}

.step {
    display: flex;
    gap: var(--space-6);
    align-items: flex-start;
}

.step-number {
    width: 60px;
    height: 60px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
    font-weight: 700;
    flex-shrink: 0;
}

.step-content h3 {
    margin-bottom: var(--space-3);
    color: var(--text-primary);
}

.step-content p {
    color: var(--text-secondary);
    margin-bottom: 0;
}

/* Pricing Section */
.pricing {
    background: var(--bg-primary);
}

.pricing-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--space-8);
    max-width: 1000px;
    margin: 0 auto;
}

.pricing-card {
    background: white;
    border: 2px solid var(--bg-tertiary);
    border-radius: var(--radius-xl);
    padding: var(--space-8);
    position: relative;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.pricing-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.pricing-card.featured {
    border-color: var(--primary-color);
    transform: scale(1.05);
}

.pricing-card.featured::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
}

.pricing-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--gradient-primary);
    color: white;
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 600;
}

.pricing-header {
    text-align: center;
    margin-bottom: var(--space-8);
}

.pricing-header h3 {
    margin-bottom: var(--space-4);
    color: var(--text-primary);
}

.price {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: var(--space-2);
    margin-bottom: var(--space-2);
}

.price-amount {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary-color);
}

.price-period {
    color: var(--text-muted);
    font-size: 1rem;
}

.price-savings {
    color: var(--success-color);
    font-weight: 600;
    font-size: 0.875rem;
}

.pricing-features {
    margin-bottom: var(--space-8);
}

.feature {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
}

.feature i {
    color: var(--success-color);
    font-size: 1.25rem;
}

.feature span {
    color: var(--text-secondary);
}

/* Demo Section */
.demo {
    background: var(--bg-secondary);
}

.demo-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-16);
    align-items: center;
}

.demo-info h2 {
    margin-bottom: var(--space-6);
}

.demo-info p {
    font-size: 1.125rem;
    margin-bottom: var(--space-8);
}

.demo-features {
    margin-bottom: var(--space-8);
}

.demo-feature {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
}

.demo-feature i {
    color: var(--primary-color);
    font-size: 1.25rem;
}

.video-placeholder {
    background: var(--bg-tertiary);
    border-radius: var(--radius-xl);
    padding: var(--space-16);
    text-align: center;
    border: 2px dashed var(--text-light);
    transition: all 0.3s ease;
    cursor: pointer;
}

.video-placeholder:hover {
    background: var(--bg-primary);
    border-color: var(--primary-color);
}

.video-placeholder i {
    font-size: 4rem;
    color: var(--primary-color);
    margin-bottom: var(--space-4);
}

.video-placeholder span {
    display: block;
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-2);
}

.video-placeholder p {
    color: var(--text-muted);
    margin: 0;
}

/* Testimonials Section */
.testimonials {
    background: var(--bg-primary);
}

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

.testimonial {
    background: white;
    padding: var(--space-8);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.testimonial:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.testimonial-content {
    margin-bottom: var(--space-6);
}

.testimonial-content p {
    font-style: italic;
    color: var(--text-secondary);
    margin-bottom: 0;
    line-height: 1.7;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    margin-bottom: var(--space-4);
}

.author-avatar {
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 600;
    font-size: 1.125rem;
}

.author-name {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-1);
}

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

.testimonial-rating {
    display: flex;
    gap: var(--space-1);
}

.testimonial-rating i {
    color: #fbbf24;
    font-size: 1rem;
}

/* CTA Section */
.cta {
    background: var(--bg-dark);
    color: white;
}

.cta-content {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.cta h2 {
    color: white;
    margin-bottom: var(--space-4);
}

.cta p {
    color: var(--text-light);
    font-size: 1.125rem;
    margin-bottom: var(--space-8);
}

.signup-form {
    margin-bottom: var(--space-8);
}

.cta-form {
    margin-bottom: var(--space-8);
    text-align: center;
}

.cta-form .btn {
    margin-bottom: var(--space-4);
}

.form-row {
    display: flex;
    gap: var(--space-4);
    margin-bottom: var(--space-4);
}

.form-row input {
    flex: 1;
    padding: var(--space-4);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.1);
    color: white;
    font-size: 1rem;
}

.form-row input::placeholder {
    color: rgba(255, 255, 255, 0.6);
}

.form-row input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-disclaimer {
    font-size: 0.875rem;
    color: var(--text-light);
    margin: 0;
}

.form-disclaimer a {
    color: var(--accent-color);
}

.cta-benefits {
    display: flex;
    justify-content: center;
    gap: var(--space-8);
}

.benefit {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    color: var(--text-light);
}

.benefit i {
    color: var(--success-color);
    font-size: 1.25rem;
}

/* Footer */
.footer {
    background: var(--bg-dark);
    color: white;
    padding: var(--space-16) 0 var(--space-8);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--space-16);
    margin-bottom: var(--space-12);
}

.footer-brand p {
    color: var(--text-light);
    margin-bottom: 0;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--space-4);
}

.footer-icon {
    width: 24px;
    height: 24px;
    flex-shrink: 0;
}

.footer-logo i {
    color: var(--primary-color);
    font-size: 1.5rem;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-8);
}

.footer-section h4 {
    color: white;
    margin-bottom: var(--space-4);
    font-size: 1rem;
}

.footer-section a {
    display: block;
    color: var(--text-light);
    margin-bottom: var(--space-2);
    transition: color 0.2s ease;
}

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

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--space-8);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    color: var(--text-light);
    margin: 0;
}

.footer-social {
    display: flex;
    gap: var(--space-4);
}

.footer-social a {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-light);
    transition: all 0.2s ease;
}

.footer-social a:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .hero-container {
        grid-template-columns: 1fr;
        gap: var(--space-12);
        text-align: center;
    }
    
    .demo-content {
        grid-template-columns: 1fr;
        gap: var(--space-12);
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--space-8);
    }
    
    .footer-links {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 769px) {
    .nav-links {
        display: flex !important;
        position: static !important;
        flex-direction: row !important;
        background: none !important;
        box-shadow: none !important;
        padding: 0 !important;
    }
    
    .mobile-menu-btn {
        display: none !important;
    }
}

@media (max-width: 768px) {
    :root {
        --space-4: 0.75rem;
        --space-6: 1rem;
        --space-8: 1.5rem;
        --space-12: 2rem;
        --space-16: 2.5rem;
        --space-20: 3rem;
    }
    
    .nav-container {
        position: relative;
    }
    
    .nav-links {
        display: none;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-actions {
        flex-direction: column;
        gap: var(--space-3);
    }
    
    .hero-stats {
        justify-content: center;
        gap: var(--space-6);
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .steps-grid {
        grid-template-columns: 1fr;
    }
    
    .pricing-cards {
        grid-template-columns: 1fr;
    }
    
    .pricing-card.featured {
        transform: none;
    }
    
    .testimonials-grid {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        flex-direction: column;
    }
    
    .cta-benefits {
        flex-direction: column !important;
        gap: var(--space-4);
        align-items: center !important;
        justify-content: center !important;
    }
    
    .footer .footer-content .footer-links {
        grid-template-columns: 1fr !important;
        justify-items: center !important;
        display: grid !important;
        justify-content: center !important;
    }
    
    .footer .footer-content .footer-links .footer-section {
        text-align: center !important;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: var(--space-4);
        text-align: center;
    }
    
    .app-mockup {
        width: 280px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--space-4);
    }
    
    .nav-container {
        padding: 0 var(--space-4);
    }
    
    .hero {
        padding: calc(64px + var(--space-12)) 0 var(--space-12);
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    section {
        padding: var(--space-16) 0;
    }
    
    .feature-card,
    .testimonial,
    .pricing-card {
        padding: var(--space-6);
    }
    
    .app-mockup {
        width: 240px;
    }
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Scroll animations */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

.animate-on-scroll.animate {
    opacity: 1;
    transform: translateY(0);
}

/* Loading states */
.loading {
    opacity: 0.7;
    pointer-events: none;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid var(--primary-color);
    border-radius: 50%;
    border-top-color: transparent;
    animation: spin 1s linear infinite;
}

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