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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 600px;
    margin: 0 auto;
}

/* 头部 - 带用户信息 */
.main-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    color: #fff;
    margin-bottom: 24px;
}

.header-left h1 {
    font-size: 28px;
    margin-bottom: 4px;
}

.header-left .subtitle {
    font-size: 14px;
    opacity: 0.85;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 12px;
}

.user-info {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.9);
}

.btn-logout {
    padding: 8px 16px;
    background: rgba(255, 255, 255, 0.2);
    color: #fff;
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 6px;
    font-size: 13px;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-logout:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* 统计卡片 */
.stats-section {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin-bottom: 24px;
}

.stat-card {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 12px;
    padding: 16px 12px;
    text-align: center;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.stat-card label {
    display: block;
    font-size: 12px;
    color: #666;
    margin-bottom: 6px;
}

.stat-card span {
    font-size: 18px;
    font-weight: 600;
}

.stat-card .income { color: #22c55e; }
.stat-card .expense { color: #ef4444; }
.stat-card .balance { color: #3b82f6; }

/* 表单区域 */
.form-section {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 24px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.form-section h2 {
    font-size: 18px;
    color: #333;
    margin-bottom: 16px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-bottom: 12px;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group.full-width {
    margin-bottom: 16px;
}

.form-group label {
    font-size: 13px;
    color: #555;
    margin-bottom: 4px;
}

.form-group input,
.form-group select {
    padding: 10px 12px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 14px;
    transition: border-color 0.2s;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: #667eea;
}

.btn-submit {
    width: 100%;
    padding: 12px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    border: none;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: opacity 0.2s;
}

.btn-submit:hover {
    opacity: 0.9;
}

/* 账单列表 */
.list-section {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.list-section h2 {
    font-size: 18px;
    color: #333;
    margin-bottom: 16px;
}

.records-list {
    list-style: none;
}

.record-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 0;
    border-bottom: 1px solid #f0f0f0;
}

.record-item:last-child {
    border-bottom: none;
}

.record-left {
    display: flex;
    align-items: center;
    gap: 12px;
}

.record-icon {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    background: #f3f4f6;
}

.record-info {
    display: flex;
    flex-direction: column;
}

.record-category {
    font-size: 14px;
    font-weight: 500;
    color: #333;
}

.record-meta {
    font-size: 12px;
    color: #999;
    margin-top: 2px;
}

.record-right {
    display: flex;
    align-items: center;
    gap: 12px;
}

.record-amount {
    font-size: 16px;
    font-weight: 600;
}

.record-amount.income { color: #22c55e; }
.record-amount.expense { color: #ef4444; }

.btn-delete {
    background: none;
    border: none;
    color: #ccc;
    font-size: 18px;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 4px;
    transition: all 0.2s;
}

.btn-delete:hover {
    color: #ef4444;
    background: #fef2f2;
}

.empty-tip {
    text-align: center;
    color: #999;
    padding: 32px 0;
    font-size: 14px;
}

/* 响应式 */
@media (max-width: 480px) {
    .main-header {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .header-right {
        margin-top: 12px;
    }

    .stats-section {
        grid-template-columns: 1fr;
    }
    .form-row {
        grid-template-columns: 1fr;
    }
}