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

:root {
    --primary-blue: #0052CC;
    --dark-blue: #003d9e;
    --light-bg: #f5f7fa;
    --text-dark: #1a1a1a;
    --text-light: #666;
    --border-color: #e0e0e0;
}

html {
    scroll-behavior: smooth;
}

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

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

/* Navigation */
.navbar {
    background: white;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 20px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 24px;
    font-weight: bold;
    color: var(--primary-blue);
}

.logo-img {
    height: 40px;
    width: auto;
    object-fit: contain;
}

/* Image optimization - consider lazy loading for above-the-fold images */
img {
    max-width: 100%;
    height: auto;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    transition: color 0.3s;
}

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

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--dark-blue) 100%);
    color: white;
    padding: 100px 20px;
    text-align: center;
}

.hero-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 30px;
}

.logo-large {
    font-size: 80px;
    animation: float 3s ease-in-out infinite;
}

.logo-img-large {
    height: 200px;
    width: auto;
    object-fit: contain;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

.hero h1 {
    font-size: 56px;
    font-weight: 700;
    margin: 20px 0;
}

.hero h2 {
    font-size: 28px;
    font-weight: 300;
    margin: 15px 0;
}

.hero p {
    font-size: 18px;
    max-width: 600px;
    opacity: 0.95;
    margin-bottom: 20px;
}

/* Download Buttons */
.download-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 30px;
}

.btn {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: transform 0.3s, box-shadow 0.3s;
    border: 2px solid white;
    background: transparent;
    color: white;
    cursor: pointer;
}

.btn.btn-app-store {
    padding: 0;
    border: none;
    background: transparent;
}

.btn.btn-google-play {
    padding: 0;
    border: none;
    background: transparent;
}

.btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
}

.btn i {
    font-size: 24px;
}

.btn strong {
    font-size: 16px;
}

.store-button {
    height: 50px;
    width: auto;
    object-fit: contain;
}

/* Features Section */
.features {
    padding: 100px 20px;
    background: white;
}

.features h2 {
    text-align: center;
    font-size: 42px;
    margin-bottom: 60px;
    color: var(--text-dark);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 40px;
}

.feature-card {
    padding: 40px;
    border-left: 4px solid var(--primary-blue);
    background: var(--light-bg);
    border-radius: 8px;
    transition: transform 0.3s, box-shadow 0.3s;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 82, 204, 0.1);
}

.feature-icon {
    font-size: 40px;
    color: var(--primary-blue);
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 20px;
    margin: 15px 0;
    color: var(--text-dark);
}

.feature-card p {
    color: var(--text-light);
    font-size: 15px;
    line-height: 1.8;
}

/* Benefits Section */
.benefits {
    padding: 100px 20px;
    background: var(--light-bg);
}

.benefits h2 {
    text-align: center;
    font-size: 42px;
    margin-bottom: 60px;
    color: var(--text-dark);
}

.benefits-list {
    max-width: 600px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.benefit-item {
    display: flex;
    align-items: center;
    gap: 20px;
    font-size: 18px;
    color: var(--text-dark);
}

.benefit-item i {
    color: var(--primary-blue);
    font-size: 24px;
    flex-shrink: 0;
}

/* CTA Section */
.cta {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--dark-blue) 100%);
    color: white;
    padding: 100px 20px;
    text-align: center;
}

.cta h2 {
    font-size: 42px;
    margin-bottom: 50px;
}

/* Footer */
.footer {
    background: var(--text-dark);
    color: white;
    padding: 50px 20px 30px;
    text-align: center;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    max-width: 1200px;
    margin: 0 auto 40px;
    text-align: left;
}

.footer-section h3 {
    font-size: 16px;
    margin-bottom: 15px;
    color: white;
}

.footer-links {
    list-style: none;
    padding: 0;
}

.footer-links li {
    margin-bottom: 10px;
}

.footer-links a,
.footer-section a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color 0.3s;
    font-size: 14px;
}

.footer-links a:hover,
.footer-section a:hover {
    color: white;
    text-decoration: underline;
}

.footer-section p {
    margin: 0;
    font-size: 14px;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 20px;
}

.footer-bottom p {
    opacity: 0.8;
    margin: 0;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-links {
        gap: 15px;
        font-size: 14px;
    }

    .hero h1 {
        font-size: 36px;
    }

    .hero h2 {
        font-size: 20px;
    }

    .hero p {
        font-size: 16px;
    }

    .logo-large {
        font-size: 60px;
    }

    .download-buttons {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 300px;
    }

    .features h2,
    .benefits h2,
    .cta h2 {
        font-size: 32px;
    }

    .features-grid {
        grid-template-columns: 1fr;
        gap: 25px;
    }

    .feature-card {
        padding: 25px;
    }

    .benefit-item {
        font-size: 16px;
    }
}

@media (max-width: 480px) {
    .navbar .container {
        flex-direction: column;
        gap: 15px;
    }

    .nav-links {
        gap: 10px;
        font-size: 12px;
    }

    .hero {
        padding: 60px 20px;
    }

    .hero h1 {
        font-size: 28px;
    }

    .hero h2 {
        font-size: 16px;
    }

    .logo-large {
        font-size: 50px;
    }

    .btn i {
        font-size: 18px;
    }

    .btn strong {
        font-size: 14px;
    }
}