body {
  margin: 0;
  padding: 0;
  font-family: Arial, sans-serif;
  display: flex;
  height: 100vh;
  background: #f5f5f5;
}

nav {
  width: 200px;
  background-color: #222;
  color: #fff;
  padding: 20px;
  box-sizing: border-box;
}
nav h3 {
  margin-top: 0;
}
nav ul {
  list-style: none;
  padding-left: 0;
}
nav li {
  margin-bottom: 10px;
}
nav a {
  color: #fff;
  text-decoration: none;
}

main {
  flex: 1;
  padding: 30px;
  background-color: #fff;
}

h1, h2, h3 {
  margin-top: 0;
}

ul.videos {
  padding-left: 20px;
}
ul.videos li {
  margin-bottom: 15px;
}
small {
  color: #666;
}

/* video_list용 */
table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 20px;
  background: #fff;
  box-shadow: 0 0 5px rgba(0,0,0,0.05);
}
th, td {
  border: 1px solid #e0e0e0;
  padding: 8px;
  font-size: 14px;
  text-align: center;
}
th {
  background: #f0f4f8;
}
.thumb-img {
  width: 48px;
  height: auto;
}
.pagination {
  margin-top: 20px;
  text-align: center;
}
.pagination a {
  margin: 0 5px;
  padding: 5px 10px;
  border: 1px solid #ccc;
  text-decoration: none;
}
.pagination a.current {
  background: #007bff;
  color: #fff;
  border-color: #007bff;
}
form {
  display: inline;
}

/* channel_list용 */
input[type="text"] {
  flex: 1;
  padding: 8px 12px;
  font-size: 1em;
  border: 1px solid #ccc;
  border-radius: 6px;
}
button {
  padding: 8px 16px;
  background-color: #007bff;
  border: none;
  color: white;
  font-size: 1em;
  border-radius: 6px;
  cursor: pointer;
}
button:hover {
  background-color: #0056b3;
}
.guide {
  font-size: 0.9em;
  color: #555;
  margin-top: 5px;
}