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

body {
  font-family: system-ui, -apple-system, sans-serif;
  background: #fafafa;
  color: #222;
  line-height: 1.5;
}

nav {
  background: #1a1a1a;
  color: #ccc;
  padding: 0.5rem 1rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  font-size: 0.875rem;
}

nav .brand { color: #fff; font-weight: 600; text-decoration: none; }
nav a { color: #aaa; text-decoration: none; }
nav a:hover, nav a.active { color: #fff; }

#app {
  max-width: 960px;
  margin: 1.5rem auto;
  padding: 0 1rem;
}

h2 { font-size: 1.125rem; margin-bottom: 1rem; }

.card {
  background: #fff;
  border: 1px solid #e0e0e0;
  border-radius: 6px;
  padding: 1rem;
  margin-bottom: 1rem;
}

.channel-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 0.75rem;
}

.channel-item {
  background: #fff;
  border: 1px solid #e0e0e0;
  border-radius: 6px;
  padding: 1rem;
  cursor: pointer;
  transition: border-color 0.15s;
}
.channel-item:hover { border-color: #888; }
.channel-item .name { font-weight: 600; }
.channel-item .sub { color: #888; font-size: 0.8rem; }

table { width: 100%; border-collapse: collapse; font-size: 0.875rem; }
th, td { text-align: left; padding: 0.5rem 0.75rem; border-bottom: 1px solid #eee; }
th { font-weight: 600; color: #555; background: #f8f8f8; position: sticky; top: 0; }

.msg { padding: 0.625rem 0; border-bottom: 1px solid #f0f0f0; }
.msg:last-child { border-bottom: none; }
.msg-header { display: flex; gap: 0.75rem; font-size: 0.8rem; color: #888; margin-bottom: 0.25rem; }
.msg-sender { font-weight: 600; color: #333; }
.msg-body { font-size: 0.9rem; }
.msg-body:empty { display: none; }

.filters { display: flex; gap: 0.5rem; flex-wrap: wrap; margin-bottom: 1rem; }
.filters input, .filters select {
  padding: 0.375rem 0.5rem;
  border: 1px solid #ddd;
  border-radius: 4px;
  font-size: 0.8rem;
}
.filters button {
  padding: 0.375rem 0.75rem;
  background: #333;
  color: #fff;
  border: none;
  border-radius: 4px;
  font-size: 0.8rem;
  cursor: pointer;
}

pre {
  background: #f4f4f4;
  padding: 0.75rem;
  border-radius: 4px;
  overflow-x: auto;
  font-size: 0.8rem;
  white-space: pre-wrap;
  word-break: break-all;
}

textarea {
  width: 100%;
  min-height: 80px;
  font-family: monospace;
  font-size: 0.85rem;
  padding: 0.5rem;
  border: 1px solid #ddd;
  border-radius: 4px;
  margin-bottom: 0.5rem;
}

.empty { color: #999; font-style: italic; padding: 2rem 0; text-align: center; }
.error { color: #c00; padding: 1rem 0; }
.loading { color: #888; padding: 1rem 0; }

.tabs { display: flex; gap: 0; border-bottom: 2px solid #e0e0e0; margin-bottom: 1rem; }
.tab {
  padding: 0.5rem 1rem;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  font-size: 0.875rem;
  color: #666;
}
.tab:hover { color: #222; }
.tab.active { border-bottom-color: #333; color: #222; font-weight: 600; }