body {
    background-color: #0f0f12;
    color: #e7e7ea;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
}

header, footer {
    background: linear-gradient(90deg, #111218, #171a22);
    padding: 20px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid #23242c;
    position: sticky;
    top: 0;
    z-index: 100;
}

h1 {
    margin: 0;
    font-size: 24px;
    letter-spacing: 1px;
}

nav a {
    color: #cfd3ff;
    text-decoration: none;
    margin: 0 12px;
    font-size: 14px;
}
nav a:hover { color: #8aa1ff; }

main { padding: 24px; }

.video-item {
    background: #12131a;
    border: 1px solid #23242c;
    padding: 16px;
    border-radius: 10px;
    box-shadow: 0 6px 20px rgba(0,0,0,0.25);
    transition: transform .2s ease, box-shadow .2s ease;
    display: flex;
    gap: 12px;
    align-items: center;
    cursor: pointer;
}
.video-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 24px rgba(0,0,0,0.35);
}
.video-item .thumb { flex: 0 0 160px; }
.video-item .meta { flex: 1 1 auto; }
.video-item h3 {
    margin: 0 0 6px 0;
    color: #e7e7ea;
}

.comments { margin-top: 12px; }
.comment {
    background: #12131a;
    border: 1px solid #23242c;
    padding: 10px;
    border-radius: 8px;
    color: #e7e7ea;
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 10px;
}
.comment-thumb {
    flex: 0 0 120px;
    margin-right: 0;
}
.comment-content {
    flex: 1 1 auto;
    display: flex;
    flex-direction: column;
}
.comment.active { outline: 2px solid #6a7bff; box-shadow: 0 0 0 2px rgba(106,123,255,0.25) inset; }
.message { background: #3a2; color: #fff; padding: 8px; border-radius: 6px; }
form label { display: block; margin: 8px 0; color: #e7e7ea; }
button {
    background: #2a2f45;
    color: #cfd3ff;
    border: 0;
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 13px;
}
button:hover { background: #343a56; }

@media (min-width: 700px) {
    main#video-list { display: grid; grid-template-columns: 1fr; }
}
@media (min-width: 1000px) {
    main#video-list { grid-template-columns: 1fr 1fr; gap: 12px; }
}
@media (max-width: 600px) {
    .video-item { flex-direction: column; align-items: flex-start; }
    .video-item .thumb { width: 100%; flex: none; }
}