/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* CSS变量定义 */
:root {
    --bg-primary: #f4f7f9;
    --bg-secondary: white;
    --text-primary: #333;
    --text-secondary: #555;
    --border-color: #ddd;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --accent-color: #3498db;
    --accent-hover: #2980b9;
    --record-bg: #f8f9fa;
    --border-bottom: #3498db;
    --expense-color: #e74c3c;
}

/* 黑夜模式变量 */
[data-theme="dark"] {
    --bg-primary: #1a1a2e;
    --bg-secondary: #16213e;
    --text-primary: #e0e0e0;
    --text-secondary: #b0b0b0;
    --border-color: #333;
    --shadow-color: rgba(0, 0, 0, 0.3);
    --accent-color: #0f3460;
    --accent-hover: #16213e;
    --record-bg: #1a1a2e;
    --border-bottom: #0f3460;
    --expense-color: #ff6b6b;
}

body {
    font-family: 'Arial', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color 0.3s, color 0.3s;
}

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

/* 标题样式 */
h1 {
    text-align: center;
    color: var(--text-primary);
    margin-bottom: 30px;
    font-size: 2.5rem;
}

h2 {
    color: var(--text-primary);
    margin-bottom: 20px;
    font-size: 1.5rem;
    border-bottom: 2px solid var(--border-bottom);
    padding-bottom: 10px;
}

/* 输入表单区域 */
.input-section {
    background-color: var(--bg-secondary);
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 2px 10px var(--shadow-color);
    margin-bottom: 30px;
    transition: background-color 0.3s, box-shadow 0.3s;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: bold;
    color: var(--text-secondary);
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    font-size: 16px;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    transition: border-color 0.3s, background-color 0.3s, color 0.3s;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 2px var(--accent-color);
}

button {
    background-color: var(--accent-color);
    color: white;
    padding: 12px 20px;
    border: none;
    border-radius: 5px;
    font-size: 16px;
    cursor: pointer;
    transition: background-color 0.3s;
}

button:hover {
    background-color: var(--accent-hover);
}

/* 主题切换按钮 */
.theme-toggle {
    position: absolute;
    top: 20px;
    right: 20px;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-primary);
    transition: color 0.3s;
}

/* 支出记录区域 */
.records-section {
    background-color: var(--bg-secondary);
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 2px 10px var(--shadow-color);
    margin-bottom: 30px;
    transition: background-color 0.3s, box-shadow 0.3s;
}

.record-item {
    background-color: var(--record-bg);
    padding: 15px;
    margin-bottom: 10px;
    border-radius: 5px;
    border-left: 5px solid var(--accent-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background-color 0.3s;
}

.record-item .record-actions {
    display: flex;
    align-items: center;
    gap: 15px;
}

.record-item .record-amount {
    font-weight: bold;
    color: var(--expense-color);
    font-size: 18px;
}

.delete-btn {
    background: none;
    border: none;
    font-size: 16px;
    cursor: pointer;
    color: var(--text-primary);
    padding: 5px;
    border-radius: 50%;
    transition: background-color 0.3s, color 0.3s;
}

.delete-btn:hover {
    background-color: rgba(231, 76, 60, 0.1);
    color: var(--expense-color);
}

.record-item .record-category {
    font-weight: bold;
    font-size: 16px;
    margin-top: 5px;
    display: flex;
    align-items: center;
    gap: 8px;
}

/* 图表区域 */
.chart-section {
    background-color: var(--bg-secondary);
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 2px 10px var(--shadow-color);
    transition: background-color 0.3s, box-shadow 0.3s;
}

.chart-container {
    position: relative;
    height: 400px;
    width: 100%;
    max-width: 600px;
    margin: 0 auto;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    .record-item {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .record-item .record-amount {
        margin-left: 0;
        margin-top: 10px;
    }
}