:root {
    --primary-color: #4a6fa5;
    --primary-dark: #3a5985;
    --secondary-color: #6c63ff;
    --light-color: #f8f9fa;
    --dark-color: #343a40;
    --text-color: #212529;
    --border-radius: 8px;
    --box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease-in-out;
}

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

body {
    font-family: 'Roboto', sans-serif;
    font-weight: 300;
    line-height: 1.6;
    color: var(--text-color);
    overflow-x: hidden;
    background-color: #f0f2f5;
    position: relative;
}

#background-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    opacity: 0.4;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
}

/* Header */
header {
    background-color: rgba(255, 255, 255, 0.95);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
}

.logo img {
    height: 40px;
}

nav ul {
    display: flex;
    align-items: center;
}

nav ul li {
    margin-left: 30px;
}

nav ul li a {
    font-weight: 400;
    color: var(--dark-color);
}

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

.download-link a {
    color: var(--primary-color);
    font-weight: 500;
}

.download-link a:hover {
    color: var(--primary-dark);
}

/* Hero Section */
.hero {
    padding: 100px 0;
    background: linear-gradient(135deg, #f5f7fa 0%, #e4e7eb 100%);
    text-align: center;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.hero h1 {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 15px;
    font-weight: 500;
}

.hero h2 {
    font-size: 1.8rem;
    color: var(--dark-color);
    margin-bottom: 20px;
    font-weight: 300;
}

.hero p {
    font-size: 1.2rem;
    margin-bottom: 30px;
    color: var(--text-color);
}

.btn-primary {
    display: inline-block;
    background-color: var(--primary-color);
    color: white;
    padding: 12px 30px;
    border-radius: var(--border-radius);
    font-weight: 400;
    transition: var(--transition);
}

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

/* Features Section */
.features {
    padding: 80px 0;
    background-color: white;
}

.features h2, .screenshots h2, .download h2, .contact h2 {
    text-align: center;
    font-size: 2.2rem;
    margin-bottom: 50px;
    color: var(--dark-color);
    font-weight: 400;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.feature-card {
    background-color: #fff;
    border-radius: var(--border-radius);
    padding: 30px;
    text-align: center;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
}

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

.feature-card i {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.feature-card h3 {
    margin-bottom: 15px;
    color: var(--dark-color);
    font-weight: 400;
}

/* Screenshots Section */
.screenshots {
    padding: 80px 0;
    background-color: #f8f9fa;
}

.screenshots-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.screenshot {
    background-color: white;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
}

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

.screenshot img {
    width: 100%;
    height: auto;
    border-bottom: 1px solid #eee;
}

.screenshot h3, .screenshot p {
    padding: 0 20px;
}

.screenshot h3 {
    margin: 20px 0 10px;
    font-weight: 400;
    color: var(--dark-color);
}

.screenshot p {
    margin-bottom: 20px;
    color: #6c757d;
}

/* Download Section */
.download {
    padding: 80px 0;
    text-align: center;
    background: linear-gradient(135deg, #f5f7fa 0%, #e4e7eb 100%);
}

.download p {
    margin-bottom: 30px;
    font-size: 1.1rem;
}

.download-button {
    display: inline-block;
    background-color: #4285F4;
    color: white;
    padding: 15px 40px;
    border-radius: var(--border-radius);
    font-weight: 400;
    font-size: 1.2rem;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
}

.download-button i {
    margin-right: 10px;
}

.download-button:hover {
    background-color: #3367d6;
    transform: translateY(-2px);
}

.privacy-notice {
    margin-top: 30px;
    color: #6c757d;
    font-size: 0.9rem;
}

.privacy-notice i {
    margin-right: 5px;
}

.btn-donate {
    display: inline-block;
    background-color: #e74c3c;
    color: white;
    padding: 12px 30px;
    border-radius: var(--border-radius);
    font-weight: 400;
    margin-top: 20px;
    transition: var(--transition);
}

.btn-donate:hover {
    background-color: #c0392b;
    transform: translateY(-2px);
}

.btn-donate i {
    margin-right: 10px;
}

/* Contact Section */
.contact {
    padding: 80px 0;
    background-color: white;
}

.contact p {
    text-align: center;
    margin-bottom: 40px;
}

#contact-form {
    max-width: 600px;
    margin: 0 auto;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 400;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: var(--border-radius);
    font-family: inherit;
    font-size: 1rem;
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(74, 111, 165, 0.2);
}

#contact-form button {
    width: 100%;
    margin-top: 10px;
    cursor: pointer;
    border: none;
}

/* Footer */
footer {
    background-color: var(--dark-color);
    color: white;
    padding: 50px 0 30px;
}

.footer-content {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
}

.footer-logo {
    flex: 1;
    min-width: 200px;
    margin-bottom: 20px;
}

.footer-logo img {
    height: 40px;
    margin-bottom: 10px;
}

.footer-links {
    flex: 1;
    min-width: 200px;
    margin-bottom: 20px;
}

.footer-links ul {
    display: flex;
    flex-wrap: wrap;
}

.footer-links ul li {
    margin-right: 20px;
    margin-bottom: 10px;
}

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

.footer-credit {
    flex: 1;
    min-width: 200px;
    text-align: right;
}

.footer-credit p {
    margin-bottom: 5px;
    font-size: 0.9rem;
    color: #adb5bd;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .hero h2 {
        font-size: 1.5rem;
    }
    
    .features-grid, .screenshots-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        flex-direction: column;
    }
    
    .footer-credit {
        text-align: left;
        margin-top: 20px;
    }
}