:root {
    --primary-color: #6366f1;
    --secondary-color: #4f46e5;
    --bg-dark: #0f172a;
    --text-light: #f8fafc;
    --text-gray: #94a3b8;
    --card-bg: rgba(30, 41, 59, 0.5);
    --gradient-start: #1e1b4b;
    --gradient-end: #0f172a;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-light);
    background: var(--bg-dark);
    overflow-x: hidden;
}

.gradient-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(45deg, var(--gradient-start), var(--gradient-end));
    z-index: -1;
}

header {
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(10px);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 100;
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    background: linear-gradient(45deg, #6366f1, #8b5cf6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-links a {
    margin-left: 2rem;
    text-decoration: none;
    color: var(--text-light);
    transition: color 0.3s;
}

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

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 6rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.hero-content {
    flex: 1;
    max-width: 600px;
}

.hero h1 {
    font-size: 3.5rem;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    background: linear-gradient(45deg, #6366f1, #8b5cf6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-gray);
    margin-bottom: 2rem;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
}

.primary-btn, .secondary-btn {
    padding: 0.8rem 2rem;
    border-radius: 0.5rem;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s;
}

.primary-btn {
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    color: white;
}

.secondary-btn {
    border: 1px solid var(--primary-color);
    color: var(--primary-color);
}

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

.feature-card {
    background: var(--card-bg);
    border-radius: 1rem;
    padding: 2rem;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: transform 0.3s;
}

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

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    background: linear-gradient(45deg, #6366f1, #8b5cf6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.download-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    padding: 2rem;
}

.download-card {
    background: var(--card-bg);
    border-radius: 1rem;
    padding: 2rem;
    text-align: center;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.platform-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 1rem;
}

.download-btn {
    display: inline-block;
    padding: 0.8rem 2rem;
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    color: white;
    text-decoration: none;
    border-radius: 0.5rem;
    margin-top: 1rem;
    transition: transform 0.3s;
}

.download-btn:hover {
    transform: translateY(-2px);
}

footer {
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(10px);
    padding: 2rem;
    margin-top: 4rem;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-links {
    display: flex;
    gap: 2rem;
}

.footer-links a {
    color: var(--text-gray);
    text-decoration: none;
    transition: color 0.3s;
}

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

.language-switch {
    display: flex;
    gap: 0.5rem;
}

.lang-btn {
    padding: 0.5rem 1rem;
    background: transparent;
    border: 1px solid var(--primary-color);
    color: var(--text-light);
    border-radius: 0.3rem;
    cursor: pointer;
    transition: all 0.3s;
}

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

.hero-image {
    flex: 1;
    max-width: 500px;
    margin-left: 2rem;
    filter: drop-shadow(0 0 20px rgba(99, 102, 241, 0.2));
}

.hero-image svg {
    width: 100%;
    height: auto;
}

@media (max-width: 768px) {
    .hero {
        flex-direction: column;
        text-align: center;
        padding: 4rem 1rem;
    }

    .hero h1 {
        font-size: 2.5rem;
    }

    .hero-buttons {
        justify-content: center;
    }

    .nav-links {
        display: none;
    }

    .footer-content {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }

    .hero-image {
        margin-left: 0;
        margin-top: 2rem;
        max-width: 100%;
    }
}

.download-progress-container {
    width: 100%;
    height: 4px;
    background: rgba(99, 102, 241, 0.1);
    border-radius: 2px;
    margin-top: 1rem;
    display: none;
}

.download-progress {
    width: 0;
    height: 100%;
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    border-radius: 2px;
    transition: width 0.3s;
}

.downloading .download-progress-container {
    display: block;
}

.version {
    color: var(--text-gray);
    font-size: 0.9rem;
    margin: 0.5rem 0;
}

.file-size {
    color: var(--text-gray);
    font-size: 0.8rem;
    margin-bottom: 1rem;
}