body {
    font-family: "PingFang SC", "Microsoft YaHei", -apple-system, sans-serif;
    scroll-behavior: smooth;
}

.glass-nav {
    backdrop-filter: blur(12px);
    background: rgba(255, 255, 255, 0.7);
}

.dark .glass-nav {
    background: rgba(18, 18, 18, 0.7);
}

.hero-gradient {
    background: radial-gradient(circle at 70% 30%, rgba(0, 82, 217, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 10% 80%, rgba(0, 82, 217, 0.05) 0%, transparent 40%);
}

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

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

.t-card {
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.t-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 10px 30px rgba(0, 82, 217, 0.1);
}

.social-icon-group:hover .social-tooltip {
    display: block;
    animation: tooltipFadeIn 0.3s ease-out;
}

.social-tooltip {
    background: rgba(0, 0, 0, 0.8);
    border-radius: 8px;
    padding: 4px;
}

@keyframes tooltipFadeIn {
    from {
        opacity: 0;
        transform: translate(-50%, 10px);
    }
    to {
        opacity: 1;
        transform: translate(-50%, 0);
    }
}

.social-tooltip::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    border: 8px solid transparent;
    border-top-color: rgba(0, 0, 0, 0.8);
}