.post-card {
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.8);
    margin-bottom: 40px;
    padding: 40px;
    position: relative;
    /* 切角效果：表现冰块的质感 */
    clip-path: polygon(0% 0%, 97% 0%, 100% 5%, 100% 100%, 3% 100%, 0% 95%);
    transition: all 0.4s ease;
}

.post-card::before {
    content: "⑨";
    position: absolute;
    top: -15px;
    right: 20px;
    font-size: 4rem;
    color: var(--ice-crystal);
    opacity: 0.1;
    font-style: italic;
}

.post-card:hover {
    transform: scale(1.02) translateY(-5px);
    background: rgba(255, 255, 255, 0.9);
    box-shadow: 0 20px 40px var(--shadow);
}

.post-title {
    font-size: 1.8rem;
    position: relative;
    padding-bottom: 15px;
    margin-bottom: 15px;
}

.post-title::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 4px;
    background: var(--ice-crystal);
    border-radius: 2px;
}