* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Poppins', sans-serif;
}

html, body {
    height: 100%;
    width: 100%;
}

.landing {
    position: relative;
    height: 100vh;
    width: 100%;
    overflow: hidden;
}

.navbar {
    position: relative;
    width: 100%;
    padding: 15px 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(0,0,0,0.3);
    z-index: 10; 
}

.nav-logo {
    width: 120px;
    height: auto;
}

.theme-toggle {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: #fff;
    transition: 0.3s;
}

.theme-toggle:hover {
    transform: scale(1.1);
}

.logo {
    position: absolute;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    object-fit: cover;
    z-index: 1; 
}

.btn {
    position: absolute; 
    bottom: 100px;      
    left: 50%;
    transform: translateX(-50%); 
    padding: 15px 50px;
    background: #27AE60;
    color: #fff;
    text-decoration: none;
    font-size: 1.2rem;
    border-radius: 50px;
    transition: all 0.3s ease;
    z-index: 20; 
}

.btn:hover {
    background: #196F3D;
    transform: translateX(-50%) scale(1.05);
}

.particles {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    z-index: 10; 
    overflow: visible;
}

.particle {
    position: absolute;
    border-radius: 50%;
    opacity: 0.7;
}

body.light-theme { 
    background-color: #fff; 
    color: #000; }
body.dark-theme { 
    background-color: #111; 
    color: #fff; }