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

:root {
    --primary-color: #4a90e2;
    --secondary-color: #50c878;
    --dark-color: #2c3e50;
    --light-color: #ecf0f1;
    --text-color: #333;
    --text-light: #666;
    --white: #ffffff;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 4px 20px rgba(0, 0, 0, 0.15);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--white);
}

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

/* Header */
.header {
    background-color: var(--white);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar {
    padding: 1rem 0;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
}

.logo img {
    height: 40px;
    width: auto;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

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

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

/* Hero Section */
.hero {
    position: relative;
    min-height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.hero-banner {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.hero-banner img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.hero-banner::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(74, 144, 226, 0.9) 0%, rgba(80, 200, 120, 0.8) 100%);
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    color: var(--white);
    padding: 3rem 0;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: bold;
    margin-bottom: 1rem;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    font-weight: 500;
}

.hero-description {
    font-size: 1.1rem;
    max-width: 700px;
    margin: 0 auto 2rem;
    opacity: 0.95;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 5px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

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

.btn-primary:hover {
    background-color: var(--light-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

.btn-secondary {
    background-color: transparent;
    color: var(--white);
    border: 2px solid var(--white);
}

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

.btn-download {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 15px 35px;
    font-size: 1.1rem;
}

.btn-android {
    background-color: #3ddc84;
    color: var(--white);
}

.btn-android:hover {
    background-color: #2fb86e;
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

.btn-ios {
    background-color: #007aff;
    color: var(--white);
}

.btn-ios:hover {
    background-color: #0056b3;
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

.btn-icon {
    font-size: 1.3rem;
}

/* Features Section */
.features {
    padding: 5rem 0;
    background-color: var(--light-color);
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: var(--dark-color);
}

.feature-category {
    margin-bottom: 4rem;
}

.category-header {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
}

.category-icon {
    font-size: 2.5rem;
}

.category-title {
    font-size: 2rem;
    color: var(--dark-color);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.feature-grid-2col {
    grid-template-columns: repeat(2, 1fr);
}

.feature-card {
    background-color: var(--white);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    border-top: 4px solid transparent;
}

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

/* Color themes for feature cards */
.feature-card-blue {
    border-top-color: #50c878;
    background: linear-gradient(135deg, #ffffff 0%, #e8f9f0 100%);
}

.feature-card-green {
    border-top-color: #50c878;
    background: linear-gradient(135deg, #ffffff 0%, #e8f9f0 100%);
}

.feature-card-purple {
    border-top-color: #50c878;
    background: linear-gradient(135deg, #ffffff 0%, #e8f9f0 100%);
}

.feature-card-orange {
    border-top-color: #50c878;
    background: linear-gradient(135deg, #ffffff 0%, #e8f9f0 100%);
}

.feature-card-cyan {
    border-top-color: #50c878;
    background: linear-gradient(135deg, #ffffff 0%, #e8f9f0 100%);
}

.feature-card-teal {
    border-top-color: #50c878;
    background: linear-gradient(135deg, #ffffff 0%, #e8f9f0 100%);
}

.feature-card-pink {
    border-top-color: #50c878;
    background: linear-gradient(135deg, #ffffff 0%, #e8f9f0 100%);
}

.feature-card-indigo {
    border-top-color: #50c878;
    background: linear-gradient(135deg, #ffffff 0%, #e8f9f0 100%);
}

.feature-card-red {
    border-top-color: #50c878;
    background: linear-gradient(135deg, #ffffff 0%, #e8f9f0 100%);
}

.feature-card-yellow {
    border-top-color: #50c878;
    background: linear-gradient(135deg, #ffffff 0%, #e8f9f0 100%);
}

.feature-card-lime {
    border-top-color: #50c878;
    background: linear-gradient(135deg, #ffffff 0%, #e8f9f0 100%);
}

.feature-card-amber {
    border-top-color: #50c878;
    background: linear-gradient(135deg, #ffffff 0%, #e8f9f0 100%);
}

.feature-name {
    font-size: 1.3rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.feature-description {
    color: var(--text-light);
    line-height: 1.8;
}

/* Download Section */
.download {
    padding: 5rem 0;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: var(--white);
    text-align: center;
}

.download .section-title {
    color: var(--white);
    margin-bottom: 1rem;
}

.download-description {
    font-size: 1.2rem;
    margin-bottom: 2.5rem;
    opacity: 0.95;
}

.download-buttons {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* Footer */
.footer {
    background-color: var(--dark-color);
    color: var(--white);
    text-align: center;
    padding: 2rem 0;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1.2rem;
    }

    .hero-description {
        font-size: 1rem;
    }

    .nav-menu {
        gap: 1rem;
        font-size: 0.9rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .category-title {
        font-size: 1.5rem;
    }

    .feature-grid {
        grid-template-columns: 1fr;
    }

    .feature-grid-2col {
        grid-template-columns: 1fr;
    }

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

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

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }

    .logo span {
        font-size: 1.2rem;
    }

    .nav-menu {
        gap: 0.5rem;
        font-size: 0.85rem;
    }
}