:root {
    --primary-color: #5B5FDE;
    --secondary-color: #0EA5E9;
    --accent-color: #FF6B6B;
    --error-color: #F43F5E;
    --success-color: #10B981;
    --warning-color: #F59E0B;
    --info-color: #3B82F6;
}

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

body {
    background-color: #F3F4F6;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

.main-container {
    padding: 14px;
}

/* 欢迎卡片 */
.welcome-card {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    border-radius: 16px;
    padding: 35px;
    margin-bottom: 25px;
    box-shadow: 0 10px 30px rgba(91, 95, 222, 0.2);
    position: relative;
    overflow: hidden;
}

.welcome-card::before {
    content: '';
    position: absolute;
    width: 250px;
    height: 250px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    top: -80px;
    right: -80px;
}

.welcome-card h2 {
    font-size: 26px;
    font-weight: 700;
    margin-bottom: 10px;
    position: relative;
    z-index: 1;
}

.welcome-card p {
    font-size: 15px;
    opacity: 0.95;
    position: relative;
    z-index: 1;
}

/* 统计卡片 */
.stat-card {
    background: white;
    border-radius: 12px;
    padding: 25px;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
    transition: all 0.3s;
    border: 1px solid #E5E7EB;
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
}

.stat-card i {
    font-size: 40px;
    opacity: 0.9;
    margin-bottom: 12px;
}

.stat-card h3 {
    font-size: 30px;
    font-weight: 700;
    margin: 12px 0 6px;
    color: #1F2937;
}

.stat-card p {
    color: #6B7280;
    font-size: 13px;
    margin: 0;
}

.stat-card.primary i {
    color: var(--primary-color);
}

.stat-card.success i {
    color: var(--success-color);
}

.stat-card.warning i {
    color: var(--warning-color);
}

.stat-card.info i {
    color: var(--info-color);
}