body {
    margin: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: url('images/background.png') no-repeat center center fixed;
    background-size: cover;
    color: #f1f5f9;
    padding-top: 110px;
    padding-bottom: 100px;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    /*background: rgba(15, 23, 42, 0.5); !* subtle dark overlay *!*/
    z-index: -1;
}

header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: #0c2739dd;
    color: #f1f5f9;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.5rem 1rem;
    z-index: 1000;
}

.header-left {
    display: flex;
    align-items: center;
}

.header-left img {
    height: 40px;
}

.header-left h1 {
    font-size: 1.5rem;
    margin-left: 1rem;
}

nav {
    padding: 0.5rem 1.5rem;
}

nav img {
    width: 24px;
    height: 24px;
    margin-left: 0.5rem;
    padding: 0.5rem 1rem;
    font-size: 1rem;
    background-color: #334155;
    border: none;
    color: #f1f5f9;
    cursor: pointer;
    border-radius: 4px;
}

nav img:hover {
    background-color: #475569;
}

.tab-content {
    display: none;
    max-width: 800px;
    margin: 2rem auto;
    padding: 0 1rem;
    text-align: center;
}

.tab-content.active {
    display: block;
}

.logo-container img {
    width: 150px;
}

.about {
    margin-top: 2rem;
    max-width: 700px;
    font-size: 1rem;
    line-height: 1.6;
    color: #e2e8f0;
    margin-left: auto;
    margin-right: auto;
}

.project-logo {
    width: 100px;
    height: 100px;
    object-fit: contain;
    display: block;
    margin: 0 auto 1rem;
}

footer {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    background-color: #1e293bdd;
    color: #94a3b8;
    text-align: center;
    padding: 0.75rem 0;
    font-size: 0.875rem;
}

a {
    color: #38bdf8;
    text-decoration: none;
}