* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: Tahoma, sans-serif;
  background: #f1f5f9;
  direction: rtl;
  color: #222;
}

header {
  background: linear-gradient(90deg,#0f172a,#1e293b);
  color: white;
  padding: 25px;
  text-align: center;
  box-shadow: 0 2px 10px rgba(0,0,0,.1);
}

header h1 {
  font-size: 28px;
}

#container {
  max-width: 1600px;
  margin: 30px auto;
  display: grid;
  grid-template-columns: repeat(auto-fit,minmax(300px,1fr));
  gap: 20px;
  padding: 15px;
}

.channel {
  background: white;
  border-radius: 18px;
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(0,0,0,.08);
}

.channel-title {
  background: #0f172a;
  color: white;
  padding: 18px;
  font-size: 22px;
  font-weight: bold;
  text-align: center;
}

.post {
  padding: 15px;
  border-bottom: 1px solid #eee;
  transition: .2s;
}

.post:hover {
  background: #f8fafc;
}

.post a {
  text-decoration: none;
  color: #222;
  line-height: 2;
  display: block;
  font-size: 15px;
}

.post a:hover {
  color: #2563eb;
}