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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: #f5f7fa;
    color: #333;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.mobile-container {
    min-height: 100vh;
    padding-bottom: 70px;
    background: #f5f7fa;
}

/* 顶部导航 */
.header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 15px 20px;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header h1 {
    font-size: 18px;
    font-weight: 600;
    flex: 1;
    text-align: center;
}

.back-btn {
    color: white;
    text-decoration: none;
    font-size: 20px;
    width: 40px;
    text-align: left;
}

.user-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: rgba(255,255,255,0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    cursor: pointer;
}

/* 主要内容 */
.main-content {
    padding: 15px;
}

/* 统计卡片网格 */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
    margin-bottom: 20px;
}

.stat-card {
    background: white;
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.stat-label {
    font-size: 12px;
    color: #999;
    margin-bottom: 8px;
}

.stat-value {
    font-size: 24px;
    font-weight: bold;
    color: #333;
}

/* 余额卡片 */
.balance-card {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 16px;
    padding: 25px;
    color: white;
    margin-bottom: 20px;
    text-align: center;
}

.balance-label {
    font-size: 14px;
    opacity: 0.9;
    margin-bottom: 10px;
}

.balance-value {
    font-size: 36px;
    font-weight: bold;
    margin-bottom: 20px;
}

.btn-withdraw {
    padding: 10px 30px;
    background: rgba(255,255,255,0.2);
    color: white;
    border: 1px solid rgba(255,255,255,0.3);
    border-radius: 20px;
    font-size: 14px;
    cursor: pointer;
}

/* 活动区域 */
.activity-section {
    background: white;
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.section-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 15px;
}

.section-header .icon {
    font-size: 20px;
}

.section-header h3 {
    font-size: 16px;
    font-weight: 600;
    color: #333;
}

.activity-list {
    max-height: 200px;
    overflow-y: auto;
}

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

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

.activity-user {
    font-size: 14px;
    color: #666;
}

.activity-amount {
    font-size: 16px;
    font-weight: 600;
    color: #667eea;
}

.empty-activity {
    text-align: center;
    color: #999;
    padding: 20px;
    font-size: 14px;
}

/* 快捷操作 */
.quick-actions {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 15px;
    margin-bottom: 20px;
}

.quick-action-btn {
    background: white;
    border-radius: 12px;
    padding: 20px;
    text-align: center;
    text-decoration: none;
    color: #333;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    transition: transform 0.2s;
}

.quick-action-btn:active {
    transform: scale(0.95);
}

.quick-action-btn.primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.quick-action-btn .icon {
    display: block;
    font-size: 24px;
    margin-bottom: 8px;
}

.quick-action-btn span:not(.icon) {
    font-size: 14px;
    font-weight: 500;
}

/* 底部导航 */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: white;
    border-top: 1px solid #e5e7eb;
    display: flex;
    justify-content: space-around;
    padding: 10px 0;
    z-index: 100;
    box-shadow: 0 -2px 10px rgba(0,0,0,0.05);
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-decoration: none;
    color: #999;
    flex: 1;
    padding: 5px;
}

.nav-item.active {
    color: #667eea;
}

.nav-icon {
    font-size: 24px;
    margin-bottom: 4px;
}

.nav-label {
    font-size: 12px;
}

/* 响应式 */
@media (max-width: 375px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .quick-actions {
        grid-template-columns: 1fr;
    }
}