/* 基础样式与通用组件 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
}

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

h1 {
    text-align: center;
    color: white;
    margin-bottom: 30px;
    font-size: 2.5em;
    text-shadow: 0 2px 10px rgba(0,0,0,0.3);
}

.content {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    padding: 30px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.1);
    backdrop-filter: blur(10px);
}

/* 按钮样式（还原admin.css效果） */
.btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
    display: inline-block;
    margin: 8px 6px 8px 0;
    vertical-align: middle;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.3);
}

.btn-small {
    padding: 8px 16px;
    font-size: 14px;
}

.btn-danger {
    background: linear-gradient(135deg, #ff6b6b 0%, #ee5a52 100%);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 8px;
    font-weight: 600;
    transition: all 0.3s ease;
    display: inline-block;
    margin: 8px 6px 8px 0;
    vertical-align: middle;
}

.btn-danger:hover {
    box-shadow: 0 8px 25px rgba(255, 107, 107, 0.3);
}

.btn-secondary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 8px;
    font-weight: 600;
    transition: all 0.3s ease;
    display: inline-block;
    margin: 8px 6px 8px 0;
    vertical-align: middle;
}

.btn-secondary:hover {
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.3);
}

input, textarea {
    font-family: inherit;
    font-size: 14px;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

@keyframes slideIn {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

.input-group {
    display: flex;
    gap: 10px;
    align-items: center;
}

.batch-actions {
    display: flex;
    gap: 10px;
    margin-bottom: 15px;
}

/* 方法切换/删除切换tab按钮（还原admin.css效果） */
.method-tabs, .delete-tabs {
    display: flex;
    margin-bottom: 20px;
    background: #f8f9fa;
    border-radius: 8px;
    padding: 4px;
}

.tab-btn {
    flex: 1;
    padding: 12px;
    background: transparent;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
}

.tab-btn.active {
    background: white;
    color: #667eea;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.tab-btn:hover:not(.active) {
    background: rgba(102, 126, 234, 0.1);
}

/* 单个按钮独占一行时可用 */
.btn-block {
    display: block;
    width: 100%;
    margin: 12px 0;
}