:root {
    --bg-color: #0f172a;
    --text-color: #f8fafc;
    --primary-color: #3b82f6;
    --secondary-color: #64748b;
    --accent-color: #22d3ee;
    --font-family: 'Be Vietnam Pro', sans-serif;
}

body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    text-align: center;
}

.container {
    padding: 2rem;
    max-width: 600px;
    width: 100%;
}

.logo {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.tagline {
    font-size: 1.25rem;
    color: var(--secondary-color);
    margin-bottom: 2rem;
}

.description {
    font-size: 1rem;
    margin-bottom: 3rem;
    line-height: 1.6;
}

.download-buttons {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    align-items: center;
}

.btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: 9999px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
    width: 100%;
    max-width: 300px;
    border: none;
    cursor: pointer;
    font-family: var(--font-family);
    font-size: 1rem;
}

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

.download-btn.android:hover {
    background-color: #2563eb;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.download-btn.ios {
    background-color: #1e293b;
    color: #94a3b8;
    cursor: not-allowed;
    opacity: 0.7;
}

.language-switch {
    position: absolute;
    top: 1rem;
    right: 1rem;
}

.lang-btn {
    background: transparent;
    border: 1px solid var(--secondary-color);
    color: var(--secondary-color);
    padding: 0.25rem 0.5rem;
    cursor: pointer;
    border-radius: 4px;
    margin-left: 0.25rem;
    font-size: 0.8rem;
    transition: all 0.2s;
}

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

footer {
    margin-top: 4rem;
    font-size: 0.875rem;
    color: var(--secondary-color);
}

footer a {
    color: var(--text-color);
    text-decoration: none;
    margin-bottom: 0.5rem;
    display: inline-block;
}

footer a:hover {
    text-decoration: underline;
}

@media (min-width: 640px) {
    .download-buttons {
        flex-direction: row;
        justify-content: center;
    }
}