.header {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    margin-bottom: 2rem;
    padding: 1rem;
}
.logo-icon {
    width: 80px;
    height: 80px;
    filter: drop-shadow(0 0 12px #00ffff);
}
.header-text {
    text-align: left;
}
.site-title {
    margin: 0;
    font-size: 2.4rem;
    font-weight: bold;
    color: white;
}
.site-title span {
    color: #00ffff;
}
.tagline {
    margin: 0;
    margin-top: 0.25rem;
    font-size: 1rem;
    color: #ccc;
}
.header-auth {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-left: auto;
}
.header-auth img {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 2px solid #00ffff;
    filter: drop-shadow(0 0 6px #00ffff);
    display: block;
}
.auth-name {
    font-size: 0.95rem;
    color: #ccc;
}
.auth-btn {
    font-size: 0.85rem;
    padding: 0.45rem 1rem;
    border: 1px solid #00ffff;
    border-radius: 20px;
    color: #00ffff;
    text-decoration: none;
    transition: background 0.2s ease, box-shadow 0.2s ease;
}
.auth-btn:hover {
    background-color: rgba(0, 255, 255, 0.1);
    box-shadow: 0 0 10px rgba(0, 255, 255, 0.4);
}

/* Clickable avatar wrapper */
.auth-avatar-link {
    display: block;
    border-radius: 50%;
    line-height: 0;
    transition: filter 0.2s ease, transform 0.2s ease;
}

.auth-avatar-link:hover {
    filter: drop-shadow(0 0 10px rgba(0, 255, 255, 0.8));
    transform: scale(1.08);
}