/* 通用样式 */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    line-height: 1.6;
    color: #333;
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* 渐变背景 */
.gradient-bg {
    background: linear-gradient(135deg, #f6f8fa 0%, #eef2f6 100%);
}

.gradient-bg-alt {
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
}

.gradient-bg-primary {
    background: linear-gradient(135deg, #7b61ff 0%, #5a43d0 100%);
}

.gradient-bg-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

/* 通用卡片样式 */
.card {
    background: white;
    border-radius: 16px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
    overflow: hidden;
}

.card-hover {
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card-hover:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.12);
}

/* 按钮样式 */
.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

.btn-primary {
    background: linear-gradient(135deg, #7b61ff, #5a43d0);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(123, 97, 255, 0.3);
}

.btn-secondary {
    background: #6c757d;
    color: white;
}

.btn-secondary:hover {
    background: #5a6268;
}

.btn-danger {
    background: #e74c3c;
    color: white;
}

.btn-danger:hover {
    background: #c0392b;
}

.btn-success {
    background: #28a745;
    color: white;
}

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

/* 表单样式 */
.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #2c3e50;
}

.form-control {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 14px;
    transition: all 0.3s ease;
    background: #f8f9fa;
}

.form-control:focus {
    outline: none;
    border-color: #7b61ff;
    background: white;
    box-shadow: 0 0 0 3px rgba(123, 97, 255, 0.1);
}

.form-select {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 14px;
    background: white;
    cursor: pointer;
}

/* 消息提示 */
.message {
    padding: 12px 20px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-weight: 500;
}

.error {
    background: #ffeaea;
    color: #e74c3c;
    border-left: 4px solid #e74c3c;
}

.success {
    background: #e8f6ef;
    color: #27ae60;
    border-left: 4px solid #27ae60;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    .card {
        border-radius: 12px;
    }
}