body {
    font-family: 'Segoe UI', Arial, sans-serif;
    background: #171c2a;
    margin: 0;
    color: #eaf1ff;
}

nav {
    position: relative;
    z-index: 100;
    width: 100%;
    display: flex;
    justify-content: center;
    gap: 1.2rem;
    padding: 1.1rem 0 0.5rem 0;
    background: transparent;
}

nav a {
    color: #fff;
    text-decoration: none;
    font-weight: 500;
    font-size: 1.07rem;
    padding: 0.7rem 1.4rem;
    border-radius: 22px;
    margin: 0 0.1rem;
    background: rgba(25, 45, 110, 0.22);
    backdrop-filter: blur(8px);
    border: 1.5px solid rgba(255, 255, 255, 0.22);
    box-shadow: 0 1px 8px #1a4dad22;
    transition: 
        background 0.18s,
        color 0.18s,
        border 0.18s,
        box-shadow 0.18s;
}
nav a:hover, nav a.active {
    background: rgba(255, 203, 5, 0.17);
    color: #ffcb05;
    border: 1.5px solid #ffcb05bb;
    box-shadow: 0 2px 14px #ffcb0555;
}

header {
    position: relative;
    background: #1a4dad;
    color: #fff;
    text-align: center;
    padding: 0;
    min-height: 240px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    overflow: hidden;
}
header .banner-bg {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    width: 100%; height: 100%;
    object-fit: cover;
    z-index: 1;
    filter: brightness(0.52) contrast(1.15);
}
header .header-content {
    position: relative;
    z-index: 2;
    padding: 2.7rem 1rem 1.7rem 1rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}
header h1 {
    margin: 0;
    font-size: 2.6rem;
    color: #ffcb05;
    letter-spacing: 1.5px;
    text-shadow: 0 3px 10px #0006;
}
header p {
    font-size: 1.15rem;
    letter-spacing: 1px;
    margin: 0.7rem 0 0 0;
    text-shadow: 0 2px 7px #1117;
}

/* MAIN tartalom */
main {
    max-width: 900px;
    background: #232840;
    margin: 2.2rem auto 2.2rem auto;
    border-radius: 18px;
    padding: 2.1rem 2rem;
    box-shadow: 0 8px 36px #142d4c70;
}

h1, h2, h3 {
    margin-top: 0;
    color: #ffcb05;
    letter-spacing: 0.5px;
}
h2, h3 {
    margin-bottom: 0.4rem;
}

img.main {
    width: 100%;
    border-radius: 16px;
    margin: 1rem 0 2rem 0;
    box-shadow: 0 6px 20px #1a4dad33;
}
ul, ol {
    font-size: 1.13rem;
    color: #eaf1ff;
    padding-left: 1.5rem;
}
.card-list {
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
    justify-content: space-between;
}
.card {
    flex: 1 1 230px;
    min-width: 200px;
    max-width: 270px;
    background: #171c2a;
    border-radius: 13px;
    padding: 1.2rem;
    box-shadow: 0 2px 10px #1a4dad11;
    margin-bottom: 2rem;
    border: 1.5px solid #263259;
}
.card h3 {
    color: #ffcb05;
    font-size: 1.1rem;
}
.partner-logos, .cert-logos {
    display: flex;
    gap: 1.5rem;
    margin: 1.5rem 0;
    flex-wrap: wrap;
    justify-content: center;
}
.placeholder-logo {
    width: 100px;
    height: 48px;
    border: 2px dashed #31476f;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #485988;
    font-size: 1rem;
    background: #171c2a;
}
.contact-info {
    font-size: 1.15rem;
    margin: 1.5rem 0;
}
.contact-btn {
    background: #ffcb05;
    color: #232840;
    padding: 0.9rem 2.3rem;
    border: none;
    border-radius: 22px;
    font-size: 1.1rem;
    font-weight: 600;
    margin-top: 2rem;
    cursor: pointer;
    transition: background 0.2s, color 0.2s;
    box-shadow: 0 2px 12px #1a4dad33;
    letter-spacing: 0.5px;
}
.contact-btn:hover {
    background: #ffd700;
    color: #142d4c;
}
a {
    color: #ffcb05;
    text-decoration: underline;
    transition: color 0.18s;
}
a:hover {
    color: #fff;
}

/* RESPONSIVE */
@media (max-width: 900px) {
    .card-list { flex-direction: column; }
    main { padding: 1rem; }
}
@media (max-width: 700px) {
    nav {
        flex-direction: column;
        gap: 0.25rem;
        padding: 0.5rem 0 0.4rem 0;
    }
    nav a {
        padding: 0.7rem 1rem;
        margin-bottom: 0.17rem;
    }
    header { min-height: 120px; }
    header h1 { font-size: 1.5rem; }
    header .header-content { padding: 1.1rem 0.2rem 0.6rem 0.2rem;}
}