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

:root {
    --primary: #4f6ef7;
    --primary-hover: #3b5de7;
    --danger: #e74c3c;
    --danger-hover: #c0392b;
    --expense: #e74c3c;
    --bg: #f5f6fa;
    --card-bg: #fff;
    --border: #e0e4ea;
    --text: #2c3e50;
    --text-secondary: #7f8c8d;
    --radius: 10px;
    --shadow: 0 2px 8px rgba(0,0,0,0.06);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
                 "Microsoft YaHei", sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
}

#app { max-width: 960px; margin: 0 auto; padding: 16px; }

/* ==================== 头部 ==================== */
.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 0 8px;
}
.header h1 { font-size: 22px; font-weight: 700; }
#header-month { color: var(--text-secondary); font-size: 14px; }

/* ==================== 汇总卡片 ==================== */
.summary-cards {
    display: flex;
    justify-content: center;
    margin-bottom: 16px;
}
.card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 20px 40px;
    box-shadow: var(--shadow);
    text-align: center;
    min-width: 200px;
}
.card-label { font-size: 13px; color: var(--text-secondary); margin-bottom: 6px; }
.card-value { font-size: 28px; font-weight: 700; }
.card-expense .card-value { color: var(--expense); }

/* ==================== 工具栏 ==================== */
.toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
    margin-bottom: 12px;
}

/* ==================== 按钮 ==================== */
.btn {
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    padding: 9px 18px;
    transition: all 0.15s;
    white-space: nowrap;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-hover); }
.btn-secondary { background: #fff; color: var(--text); border: 1px solid var(--border); }
.btn-secondary:hover { background: var(--bg); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { background: var(--danger-hover); }
.btn-sm { padding: 6px 12px; font-size: 13px; }
.btn-xs { padding: 3px 8px; font-size: 12px; }

/* ==================== 输入框 ==================== */
.input {
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 9px 12px;
    font-size: 14px;
    outline: none;
    transition: border-color 0.15s;
    background: #fff;
    width: 100%;
}
.input:focus { border-color: var(--primary); }
.input-sm { padding: 6px 10px; font-size: 13px; width: auto; }

/* ==================== 表格 ==================== */
.table-wrapper { background: var(--card-bg); border-radius: var(--radius); box-shadow: var(--shadow); overflow-x: auto; }
#bill-table { width: 100%; border-collapse: collapse; min-width: 500px; }
#bill-table th {
    background: #fafbfc;
    padding: 12px 14px;
    text-align: left;
    font-size: 13px;
    color: var(--text-secondary);
    font-weight: 600;
    border-bottom: 1px solid var(--border);
}
#bill-table td {
    padding: 10px 14px;
    font-size: 14px;
    border-bottom: 1px solid #f0f2f5;
}
#bill-table tbody tr:hover { background: #fafbff; }
.amount-expense { color: var(--expense); font-weight: 600; }
.action-links { display: flex; gap: 6px; }
.action-links a { color: var(--primary); cursor: pointer; font-size: 13px; text-decoration: none; }
.action-links a:hover { text-decoration: underline; }
.action-links a.delete { color: var(--danger); }
.empty-tip { text-align: center; padding: 40px; color: var(--text-secondary); font-size: 15px; }

/* ==================== 分页 ==================== */
.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-top: 12px;
}
#page-info { font-size: 13px; color: var(--text-secondary); }

/* ==================== 图表 ==================== */
.charts {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-top: 20px;
}
.charts-single {
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}
.chart-container {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: var(--shadow);
    text-align: center;
}
.chart-container h3 { font-size: 15px; margin-bottom: 12px; color: var(--text); }
.chart-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 8px; }
.chart-header h3 { margin-bottom: 0; }
.chart-container canvas { max-width: 100%; height: auto; }
.chart-legend { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; margin-top: 10px; }
.legend-item { display: flex; align-items: center; gap: 4px; font-size: 12px; }
.legend-color { width: 12px; height: 12px; border-radius: 3px; }

/* ==================== 预算条 ==================== */
.budget-bar {
    display: flex;
    align-items: center;
    gap: 10px;
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 10px 16px;
    margin-bottom: 12px;
    box-shadow: var(--shadow);
    font-size: 13px;
    flex-wrap: wrap;
}
.budget-progress {
    flex: 1;
    min-width: 100px;
    height: 10px;
    background: #e8ecf1;
    border-radius: 5px;
    overflow: hidden;
}
.budget-fill {
    height: 100%;
    background: var(--primary);
    border-radius: 5px;
    transition: width 0.3s;
}
.budget-fill.over { background: var(--danger); }

/* ==================== 分类列表 ==================== */
.cat-list { display: flex; flex-wrap: wrap; gap: 6px; }
.cat-tag {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 10px;
    background: #f0f3f9;
    border-radius: 14px;
    font-size: 13px;
}
.cat-tag .cat-del { color: var(--danger); cursor: pointer; font-size: 14px; }

/* ==================== 弹窗 ==================== */
.modal { position: fixed; inset: 0; z-index: 100; display: flex; align-items: center; justify-content: center; }
.modal-overlay { position: absolute; inset: 0; background: rgba(0,0,0,0.4); }
.modal-box {
    position: relative;
    background: #fff;
    border-radius: 14px;
    padding: 24px;
    width: 420px;
    max-width: 90vw;
    box-shadow: 0 10px 40px rgba(0,0,0,0.15);
}
.modal-sm { width: 340px; }
.modal-box h3 { margin-bottom: 16px; font-size: 17px; }
.modal-actions { display: flex; gap: 10px; justify-content: flex-end; margin-top: 16px; }
.form-group { margin-bottom: 12px; }
.form-group label { display: block; font-size: 13px; color: var(--text-secondary); margin-bottom: 4px; }
.form-row { display: flex; gap: 10px; }
.flex-1 { flex: 1; }
#auth-msg { font-size: 14px; color: var(--text-secondary); margin-bottom: 10px; }

/* ==================== 响应式 ==================== */
@media (max-width: 768px) {
    .card { min-width: auto; padding: 16px 24px; }
    .card-value { font-size: 22px; }
    .charts { grid-template-columns: 1fr; }
    .toolbar { flex-wrap: wrap; }
    #bill-table { min-width: auto; }
    #bill-table th:nth-child(4), #bill-table td:nth-child(4) { display: none; }
}

@media (max-width: 480px) {
    .card-value { font-size: 18px; }
    .card-label { font-size: 11px; }
    .header h1 { font-size: 18px; }
}