/* 频道基础样式 */
.channel-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    font-family: system-ui, -apple-system, sans-serif;
}

.channel-nav {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    border-bottom: 2px solid #e5e7eb;
    padding-bottom: 10px;
}

.channel-btn {
    padding: 10px 20px;
    border: none;
    background: #f3f4f6;
    border-radius: 8px;
    cursor: pointer;
    font-size: 16px;
    transition: all 0.2s;
}

.channel-btn:hover {
    background: #e5e7eb;
}

.channel-btn.active {
    background: #3b82f6;
    color: white;
}

.channel-btn.visited {
    position: relative;
}

.channel-btn.visited::after {
    content: "✓";
    position: absolute;
    top: -5px;
    right: -5px;
    background: #10b981;
    color: white;
    border-radius: 50%;
    width: 20px;
    height: 20px;
    font-size: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.channel-content {
    min-height: 400px;
    padding: 20px;
    background: white;
    border-radius: 12px;
    box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1);
}