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

body {
    font-family: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: #1f2937;
    background-color: #f9fafb;
}

.nav-link {
    position: relative;
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    transition: all 0.3s ease;
}

.nav-link:hover {
    background-color: rgba(239, 68, 68, 0.1);
    transform: translateY(-1px);
}

.nav-link.active {
    background-color: rgba(239, 68, 68, 0.1);
    color: #dc2626 !important;
    font-weight: 600;
}

section {
    scroll-margin-top: 100px;
}

.card-hover {
    transition: all 0.3s ease;
}

.card-hover:hover {
    transform: translateY(-4px);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

.gradient-text {
    background: linear-gradient(135deg, #dc2626, #ef4444);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.platform-card {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.9), rgba(255, 255, 255, 0.7));
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: all 0.4s ease;
}

.platform-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.15);
}

.data-highlight {
    position: relative;
    display: inline-block;
}

.data-highlight::after {
    content: '';
    position: absolute;
    bottom: 2px;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, #dc2626, #ef4444);
    border-radius: 2px;
    opacity: 0.7;
}

.source-tag {
    background: linear-gradient(135deg, #f3f4f6, #e5e7eb);
    border-left: 3px solid #6b7280;
    font-size: 0.875rem;
    font-style: italic;
}

table {
    border-collapse: separate;
    border-spacing: 0;
    border-radius: 0.5rem;
    overflow: hidden;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

table th {
    background: linear-gradient(135deg, #1f2937, #374151);
    color: white;
    font-weight: 600;
    text-align: left;
    padding: 1rem;
}

table td {
    background: white;
    padding: 1rem;
    border-bottom: 1px solid #e5e7eb;
    transition: background-color 0.2s ease;
}

table tr:hover td {
    background-color: #f9fafb;
}

.chart-container {
    position: relative;
    background: white;
    border-radius: 0.75rem;
    padding: 1.5rem;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    margin-top: 2rem;
}

.info-gap-section {
    background: linear-gradient(135deg, #fef3c7, #fde68a);
    border: 2px solid #f59e0b;
    border-radius: 0.75rem;
    padding: 2rem;
}

.conclusion-section {
    background: linear-gradient(135deg, #d1fae5, #a7f3d0);
    border: 2px solid #10b981;
    border-radius: 0.75rem;
    padding: 2rem;
}

@media (max-width: 768px) {
    .nav-link {
        padding: 0.75rem 1rem;
        display: block;
        border-bottom: 1px solid #e5e7eb;
    }
    
    .nav-link:last-child {
        border-bottom: none;
    }
    
    table {
        font-size: 0.875rem;
    }
    
    table th,
    table td {
        padding: 0.75rem 0.5rem;
    }
}

.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.6s ease-out;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

.brand-accent {
    color: #dc2626;
}

.brand-bg {
    background-color: #dc2626;
}

.brand-border {
    border-color: #dc2626;
}

.shadow-brand {
    box-shadow: 0 10px 25px rgba(220, 38, 38, 0.15);
}