nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    background: white;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.8rem;
}
.logo img {
    width: 40px;
    height: 40px;
}

.nav-button {
    background: #4285f4;
    color: white;
    padding: 0.8rem 1.5rem;
    border: none;
    border-radius: 24px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.nav-button:hover {
    background: #357abd;
}

main {
    padding: 4rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.hero-section {
    margin-top: 3rem;
}

h1 {
    font-size: 2.5rem;
    color: #202124;
    margin-bottom: 1.5rem;
    line-height: 1.3;
}

.subtitle {
    font-size: 1.2rem;
    color: #5f6368;
    margin-bottom: 3rem;
    max-width: 600px;
}

.join-container {
    display: flex;
    gap: 1rem;
    max-width: 500px;
}

.code-box {
    margin: 0;
    display: flex;
    flex-direction: column;
    /* gap: 30px; */
    position: relative;
    width: 250px;
    justify-content: center;
}

#code-input {
    padding: 10px;
    border: 1px solid rgba(0, 0, 0, 0.5);
    background: white;
    border-radius: 8px;
    outline: none;
    color: #000000;
    font-size: 1em;
    transition: 0.5s;
}
#code-span {
    position: absolute;
    left: 0;
    padding: 0 10px;
    pointer-events: none;
    font-size: 1em;
    color: rgba(0, 0, 0, 0.5);
    text-transform: uppercase;
    transition: all 0.5s;
}
#code-input:valid ~ #code-span,
#code-input:focus ~ #code-span {
    color: #4285f4;
    transform: translateX(-15px) translateY(-18px) scale(0.7);
    /* font-size: 0.65em; */
    padding: 0 10px;
    background: white;
    border-left: 3px solid #4285f4;
    border-right: 3px solid #4285f4;
    /* letter-spacing: .2em; */
}
#code-input:valid, #code-input:focus {
    border: 3px solid #4285f4;
}

.join-button {
    background: linear-gradient(135deg, #4285f4, #34a853);
    color: white;
    padding: 1rem 2rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.join-button:hover {
    opacity: 0.9;
    transform: translateY(-1px);
}

@media (max-width: 768px) {
    h1 {
        font-size: 2rem;
    }

    .join-container {
        flex-direction: column;
    }
}