body {
    font-family: Arial, sans-serif;
    margin: 0;
    line-height: 1.6;
    background: #0b0c0f;
    color: #e6e6e6;
}

header {
    background: #111112;
    color: white;
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

header nav a {
    color: white;
    margin-left: 15px;
    text-decoration: none;
}

header nav a:hover {
    text-decoration: underline;
}

.logo {
    max-width: 180px;
    height: auto;
}

.hero {
    background: url("img/hero.jpg") no-repeat center center / cover;
    color: #0e0e0f;
    text-align: center;
    padding: 80px 20px;
}

.hero h1,
.hero p {
    display: inline-block;
    background: rgba(255, 255, 255, 0.75);
    padding: 6px 10px;
    border-radius: 8px;
}

.hero h1 {
    margin: 0 0 10px 0;
}

.hero p {
    font-size: 1.1rem;
    margin: 0;
}

.flag {
    width: 24px;
    height: auto;
    vertical-align: middle;
    margin-left: 5px;
}

.flag.active {
    opacity: 0.5;
    cursor: default;
    pointer-events: none;
}

section {
    padding: 40px 20px;
}

h2 {
    text-align: center;
    margin-top: 0;
}

.cards {
    display: flex;
    gap: 20px;
    padding: 20px 0;
    flex-wrap: wrap;
}

.card {
    background: #151821;
    border: 1px solid #23283a;
    padding: 20px;
    border-radius: 8px;
    flex: 1;
    min-width: 250px;
}

.card h3 {
    margin-top: 0;
}

#about p {
    max-width: 900px;
    margin: 0 auto;
}

#clients {
    text-align: center;
    padding: 40px 20px;
    background: #ffffff;
    color: #111;
}

#clients h2 {
    color: #111;
}

.clients {
    display: flex;
    justify-content: center;
    gap: 40px;
    flex-wrap: wrap;
    margin-top: 20px;
}

.client {
    background: #f4f4f4;
    border: 1px solid #e5e5e5;
    padding: 18px 22px;
    border-radius: 10px;
    cursor: pointer;
}

.client a {
    text-decoration: none;
    color: inherit;
    display: block;
}

.client:hover {
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.client img {
    max-width: 180px;
    height: auto;
    filter: grayscale(0%);
    transition: transform 0.3s ease;
}

.client img:hover {
    transform: scale(1.05);
}

.client p {
    margin-top: 10px;
    font-weight: 600;
    color: #111;
}

#contact p {
    text-align: center;
    margin: 6px 0;
}

footer {
    background: #111112;
    color: white;
    text-align: center;
    padding: 1rem;
    margin-top: 20px;
}

/* Responsive */
@media (max-width: 768px) {
    .logo {
        max-width: 140px;
    }

    .hero {
        padding: 50px 15px;
    }

    .clients {
        gap: 25px;
    }
}

.contact-form {
    max-width: 500px;
    margin: 0 auto;
    background: #151821;
    border: 1px solid #23283a;
    padding: 25px;
    border-radius: 10px;
}

.form-group {
    display: flex;
    flex-direction: column;
    margin-bottom: 15px;
}

.form-group label {
    margin-bottom: 6px;
    font-weight: 600;
}

.form-group input,
.form-group textarea {
    padding: 10px;
    border-radius: 6px;
    border: 1px solid #2c3150;
    background: #0b0c0f;
    color: #e6e6e6;
    font-size: 0.95rem;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #4f6bed;
}

.contact-form button {
    width: 100%;
    padding: 12px;
    background: #4f6bed;
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 1rem;
    cursor: pointer;
    font-weight: 600;
}

.contact-form button:hover {
    background: #3f5bdc;
}

.cert-title {
    text-align: center;
    margin-top: 30px;
}

.cert-list {
    list-style: none;
    padding: 0;
    max-width: 500px;
    margin: 15px auto 0;
}

.cert-list li {
    position: relative;
    padding-left: 32px;
    margin-bottom: 12px;
    font-weight: 500;
}

.cert-list li::before {
    content: "📜";
    position: absolute;
    left: 0;
    top: 0;
}