:root {
    --primary-color: #00B0B9; /* Fitbit Teal-ish */
    --text-color: #1A1A1A;
    --text-secondary: #666666;
    --bg-color: #FFFFFF;
    --bg-secondary: #F8F9FA;
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

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

body {
    font-family: var(--font-family);
    color: var(--text-color);
    line-height: 1.6;
    background-color: var(--bg-color);
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
header {
    padding: 20px 0;
    position: sticky;
    top: 0;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    z-index: 100;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--text-color);
}

.btn-download {
    background-color: var(--text-color);
    color: white;
    padding: 10px 20px;
    border-radius: 20px;
    text-decoration: none;
    font-weight: 500;
    transition: opacity 0.2s;
}

.btn-download:hover {
    opacity: 0.9;
}

/* Hero Section */
.hero {
    padding: 80px 0;
    background: radial-gradient(circle at top right, #E0F7FA 0%, #FFFFFF 60%);
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
}

.hero h1 {
    font-size: 3.5rem;
    line-height: 1.1;
    margin-bottom: 20px;
    letter-spacing: -0.02em;
}

.hero p {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 30px;
    max-width: 450px;
}

.badge {
    display: inline-block;
    background-color: #E8F0FE;
    color: #1967D2;
    padding: 8px 16px;
    border-radius: 6px;
    font-weight: 600;
    font-size: 0.9rem;
}

/* Phone Mockup */
.phone-mockup {
    position: relative;
    width: 300px;
    height: 600px;
    background: #000;
    border-radius: 40px;
    border: 10px solid #333;
    margin: 0 auto;
    overflow: hidden;
    box-shadow: 0 20px 40px rgba(0,0,0,0.2);
}

.screenshot-placeholder {
    width: 100%;
    height: 100%;
    object-fit: cover;
    background-color: #eee; /* Placeholder color */
    display: block;
}

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

.features h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 60px;
}

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

.feature-card {
    padding: 30px;
    background: var(--bg-secondary);
    border-radius: 16px;
    transition: transform 0.2s;
}

.feature-card:hover {
    transform: translateY(-5px);
}

.icon {
    font-size: 2.5rem;
    margin-bottom: 20px;
}

.feature-card h3 {
    margin-bottom: 10px;
    font-size: 1.25rem;
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Footer */
footer {
    padding: 40px 0;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
    border-top: 1px solid #eee;
}

/* Responsive */
@media (max-width: 768px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .hero p {
        margin: 0 auto 30px;
    }
    
    .phone-mockup {
        width: 260px;
        height: 520px;
    }
}