/* 基础重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
    background: #f5f7fb;
    color: #1e293b;
    line-height: 1.5;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* 导航栏 */
.channel-nav {
    background: white;
    padding: 1rem 2rem;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
    display: flex;
    gap: 2rem;
    border-bottom: 1px solid #e2e8f0;
}

.nav-link {
    text-decoration: none;
    color: #64748b;
    font-weight: 500;
    padding: 0.5rem 0;
    border-bottom: 2px solid transparent;
    transition: all 0.2s;
}

.nav-link:hover {
    color: #0284c7;
}

.nav-link.active {
    color: #0284c7;
    border-bottom-color: #0284c7;
}

/* 路由视图容器 */
.router-view {
    flex: 1;
    padding: 2rem;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
    background: white;
    border-radius: 12px 12px 0 0;
    box-shadow: 0 -4px 12px rgba(0,0,0,0.02);
}

/* 状态栏 */
.status-bar {
    background: #1e293b;
    color: #94a3b8;
    padding: 0.75rem 2rem;
    font-size: 0.9rem;
    text-align: center;
    border-top: 1px solid #334155;
}

/* 卡片网格 */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.module-card {
    background: #f8fafc;
    border: 1px solid #e2e8f0;
    border-radius: 12px;
    padding: 1.5rem 1rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
    box-shadow: 0 2px 4px rgba(0,0,0,0.02);
}

.module-card:hover {
    transform: translateY(-4px);
    border-color: #0284c7;
    box-shadow: 0 12px 20px -8px rgba(2, 132, 199, 0.2);
}

.module-card h3 {
    margin-bottom: 0.5rem;
    color: #0f172a;
}

.module-card p {
    font-size: 0.9rem;
    color: #64748b;
}

/* 加载动画 */
.loader {
    display: inline-block;
    width: 24px;
    height: 24px;
    border: 3px solid #e2e8f0;
    border-top-color: #0284c7;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* 错误提示 */
.error-message {
    background: #fee2e2;
    border: 1px solid #ef4444;
    color: #b91c1c;
    padding: 1rem;
    border-radius: 8px;
    margin: 1rem 0;
}

/* 模块内容区 */
.module-content {
    margin-top: 2rem;
    border-top: 1px dashed #cbd5e1;
    padding-top: 2rem;
}

.back-button {
    background: none;
    border: 1px solid #cbd5e1;
    padding: 0.5rem 1.5rem;
    border-radius: 30px;
    cursor: pointer;
    font-size: 0.95rem;
    color: #475569;
    transition: all 0.2s;
    margin-bottom: 1rem;
}

.back-button:hover {
    background: #f1f5f9;
    border-color: #94a3b8;
}