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

:root {
    --primary-color: #007AFF;
    --secondary-color: #5856D6;
    --text-dark: #1d1d1f;
    --text-light: #6e6e73;
    --bg-light: #f5f5f7;
    --bg-dark: #000000;
    --white: #ffffff;
    --gradient: linear-gradient(135deg, #007AFF 0%, #5856D6 100%);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Hero Section */
.hero {
    background: var(--bg-dark);
    color: var(--white);
    padding: 80px 0 100px;
    min-height: 90vh;
    display: flex;
    align-items: center;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero h1 {
    font-size: 56px;
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 24px;
    background: linear-gradient(135deg, #ffffff 0%, #a0a0a0 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    font-size: 24px;
    color: #a0a0a0;
    margin-bottom: 40px;
    line-height: 1.4;
}

.cta-buttons {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 16px 32px;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 600;
    font-size: 18px;
    transition: all 0.3s ease;
    cursor: pointer;
}

.btn-primary {
    background: var(--gradient);
    color: var(--white);
    box-shadow: 0 10px 30px rgba(0, 122, 255, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 40px rgba(0, 122, 255, 0.4);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: var(--white);
    border: 2px solid rgba(255, 255, 255, 0.2);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.15);
}

.btn-large {
    padding: 20px 40px;
    font-size: 20px;
}

.apple-icon {
    width: 24px;
    height: 24px;
}

/* Phone Mockup */
.phone-mockup {
    position: relative;
    width: 300px;
    height: 600px;
    background: #1d1d1f;
    border-radius: 40px;
    padding: 12px;
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.5);
    margin: 0 auto;
}

.phone-screen {
    width: 100%;
    height: 100%;
    background: #000;
    border-radius: 32px;
    overflow: hidden;
}

.app-preview {
    padding: 40px 20px;
}

.preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 40px;
}

.timer {
    font-size: 36px;
    font-weight: 700;
    color: #fff;
}

.finish-btn {
    background: linear-gradient(135deg, #ff3b30 0%, #ff6b6b 100%);
    color: #fff;
    padding: 8px 16px;
    border-radius: 12px;
    font-size: 14px;
    font-weight: 600;
}

.preview-exercise {
    background: rgba(255, 255, 255, 0.1);
    padding: 20px;
    border-radius: 16px;
    text-align: center;
}

.exercise-icon {
    font-size: 48px;
    margin-bottom: 12px;
}

.exercise-name {
    font-size: 18px;
    font-weight: 600;
    color: #fff;
    margin-bottom: 4px;
}

.exercise-sets {
    font-size: 14px;
    color: #a0a0a0;
}

/* Features Section */
.features {
    padding: 100px 0;
    background: var(--white);
}

.features h2 {
    font-size: 48px;
    text-align: center;
    margin-bottom: 16px;
}

.section-subtitle {
    text-align: center;
    font-size: 20px;
    color: var(--text-light);
    margin-bottom: 60px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
}

.feature-card {
    text-align: center;
    padding: 40px 20px;
}

.feature-icon {
    font-size: 64px;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 24px;
    margin-bottom: 12px;
}

.feature-card p {
    color: var(--text-light);
    font-size: 16px;
    line-height: 1.6;
}

/* How It Works */
.how-it-works {
    padding: 100px 0;
    background: var(--bg-light);
}

.how-it-works h2 {
    font-size: 48px;
    text-align: center;
    margin-bottom: 60px;
}

.steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
}

.step {
    text-align: center;
}

.step-number {
    width: 60px;
    height: 60px;
    background: var(--gradient);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    font-weight: 700;
    margin: 0 auto 20px;
}

.step h3 {
    font-size: 24px;
    margin-bottom: 12px;
}

.step p {
    color: var(--text-light);
    font-size: 16px;
}

/* Testimonials */
.testimonials {
    padding: 100px 0;
    background: var(--white);
}

.testimonials h2 {
    font-size: 48px;
    text-align: center;
    margin-bottom: 60px;
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
}

.testimonial {
    background: var(--bg-light);
    padding: 40px;
    border-radius: 20px;
    text-align: center;
}

.stars {
    font-size: 24px;
    margin-bottom: 20px;
}

.testimonial p {
    font-size: 18px;
    font-style: italic;
    margin-bottom: 20px;
    line-height: 1.6;
}

.author {
    color: var(--text-light);
    font-size: 14px;
    font-weight: 600;
}

/* CTA Section */
.cta-section {
    padding: 100px 0;
    background: var(--bg-dark);
    color: var(--white);
    text-align: center;
}

.cta-section h2 {
    font-size: 48px;
    margin-bottom: 20px;
}

.cta-section p {
    font-size: 20px;
    color: #a0a0a0;
    margin-bottom: 40px;
}

.small-text {
    font-size: 14px;
    color: #6e6e73;
    margin-top: 20px;
}

/* Footer */
footer {
    background: #1d1d1f;
    color: var(--white);
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-brand h3 {
    font-size: 24px;
    margin-bottom: 12px;
}

.footer-brand p {
    color: #a0a0a0;
}

.footer-links h4 {
    font-size: 16px;
    margin-bottom: 16px;
    color: #a0a0a0;
}

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

.footer-links a {
    color: var(--white);
    text-decoration: none;
    line-height: 2;
    transition: color 0.3s ease;
}

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

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: #6e6e73;
}

/* Responsive */
@media (max-width: 768px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero h1 {
        font-size: 40px;
    }
    
    .subtitle {
        font-size: 18px;
    }
    
    .phone-mockup {
        width: 250px;
        height: 500px;
    }
    
    .features h2,
    .how-it-works h2,
    .testimonials h2,
    .cta-section h2 {
        font-size: 36px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .cta-buttons {
        justify-content: center;
    }
}