/* ===== БАЗОВА ТЕМА ===== */
body {
    font-family: "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    color: #cfd8dc;
    margin: 0;
    padding: 0;
    text-align: center;
    background: linear-gradient(180deg, #0a0c10 0%, #11161c 100%);
    background-attachment: fixed;
    min-height: 100vh;
}

/* ===== ХЕДЕР ===== */
header {
    width: 100%;
    padding: 60px 0 40px;
    background: linear-gradient(180deg, #090b0f 0%, #0d1116 100%);
    border-bottom: 1px solid #1f242b;
    box-shadow: 0 2px 15px rgba(0, 0, 0, 0.5);
}

#logo {
    width: 200px;
    height: auto;
    transition: opacity 0.3s ease;
}

#logo:hover {
    opacity: 0.8;
}

/* ===== КОНТЕЙНЕР ===== */
.container {
    max-width: 850px;
    width: 90%;
    margin: 0 auto;
    padding: 20px;
}

/* ===== ЗАГОЛОВКИ ===== */
h2 {
    color: #258297; /* спокійний блакитний */
    margin-bottom: 25px;
    position: relative;
    display: inline-block;
    font-size: 2em;
    font-weight: 500;
    letter-spacing: 0.5px;
}

h2::after {
    content: "";
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 60%;
    height: 2px;
    background: linear-gradient(90deg, #79aaff, #00b8a9);
    opacity: 0.5;
}

h3 {
    color: #00bfa6;
    font-weight: 600;
}

/* ===== ПРОЄКТ ===== */
.project {
    background: #15191f;
    border: 1px solid #1e252c;
    border-radius: 10px;
    padding: 25px;
    margin-bottom: 40px;
    text-align: left;
    box-shadow: 0 0 12px rgba(0, 0, 0, 0.4);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.project:hover {
    transform: translateY(-3px);
    box-shadow: 0 0 18px rgba(0, 255, 200, 0.1);
}

.project p {
    margin-top: 5px00;
    line-height: 1.6;
    color: #cfd8dc;
}

.project strong {
    color: #00bfa6;
}

.video-container {
    display: flex;
    justify-content: center;
    margin: 40px 0;
}

.video-container iframe {
    width: 560px;
    height: 315px;
    border-radius: 10px;
    border: none;
    box-shadow: 0 0 15px rgba(0, 255, 200, 0.1);
}

/* ===== ФУТЕР ===== */
footer {
    background: #0d1116;
    border-top: 1px solid #1f242b;
    padding: 20px;
    margin-top: 60px;
    color: #7a8c99;
    font-size: 14px;
    text-align: center;
}

/* ===== АДАПТИВ ===== */
@media (max-width: 768px) {
    h2 {
        font-size: 1.7em;
    }

    .project {
        padding: 20px;
    }

    .video-container iframe {
        width: 100%;
        height: auto;
        aspect-ratio: 16 / 9;
    }

    #logo {
        width: 150px;
    }
}