header {
    background-color: rgba(0, 0, 0, 0.9);
    position: fixed;
    width: 100%;
    top: 0;
    left: 0;
    z-index: 1000;
    transition: background-color 0.3s;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

header.scrolled {
    background-color: rgba(0, 0, 0, 0.95);
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
}

.logo {
    display: flex;
    align-items: center;
}

.logo img {
    height: 50px;
    filter: drop-shadow(0 0 8px rgba(229, 9, 20, 0.6));
    transition: transform 0.3s, filter 0.3s;
}

.logo img:hover {
    transform: scale(1.05);
    filter: drop-shadow(0 0 12px rgba(229, 9, 20, 0.8));
}

.logo-text {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-left: 15px;
    letter-spacing: 1px;
    text-transform: uppercase;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
    transition: color 0.3s;
}

.logo-text:hover {
    color: #ff0a16;
}

.nav-menu {
    display: flex;
    list-style: none;
}

.nav-menu li {
    margin-left: 30px;
}

.nav-menu a {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
    position: relative;
}

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

.nav-menu a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    bottom: -5px;
    left: 0;
    transition: width 0.3s;
}

.nav-menu a:hover::after {
    width: 100%;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
}