/* 课程会员系统基础样式 */
:root {
    --primary: #e11d48;
    --secondary: #ea580c;
    --bg: #f2efe8;
    --text: #333;
}

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

body {
    font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

.btn {
    display: inline-block;
    padding: 10px 24px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 14px;
    cursor: pointer;
    text-decoration: none;
}

.btn:hover { background: #c4153b; text-decoration: none; }

.btn-outline {
    background: transparent;
    border: 2px solid var(--primary);
    color: var(--primary);
}

.btn-outline:hover { background: var(--primary); color: white; }

.btn-success { background: #28a745; }
.btn-success:hover { background: #218838; }

.btn:disabled { background: #ccc; cursor: not-allowed; }

.membership-badge {
    display: inline-block;
    background: var(--secondary);
    color: white;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: bold;
}

/* 表单样式 */
.form-control {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 6px;
    font-size: 16px;
    margin-bottom: 15px;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(225, 29, 72, 0.1);
}

/* 响应式 */
@media (max-width: 768px) {
    .course-layout { flex-direction: column; }
    .sidebar { width: 100%; position: static; }
    .lesson-frame iframe { height: 600px; }
}