/* ====== 页面样式 ====== */
.milestone-container {
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    margin-top: 50px;
    margin-bottom: 90px;
    gap: 120px;
}
.milestone-container a {
    text-decoration: none;
    color: var(--text-primary-colour);
}
.milestone-container a:hover {
    text-decoration: underline;
}
.milestone-container .title {
    color: var(--text-primary-colour);
    font-weight: bolder;
    font-size: xx-large;
}
.milestone-container .menu {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: left;
    gap: 10px;
    list-style: none;
}
.milestone-container .menu::before {
    content: '';
    position: absolute;
    height: calc(97%);  /* 为箭头留出空间 */
    width: 4px;
    background: linear-gradient(to bottom, #00b0f0, #b3e5fc);
    border-radius: 2px;
    transform: translateX(-20px);
    z-index: 1;
}
.milestone-container .menu::after {
    content: '';
    position: absolute;
    transform: translateX(-26px);
    top: 95px;
    border-left: 8px solid transparent;
    border-right: 8px solid transparent;
    border-bottom: 16px solid #00b0f0;
    z-index: 2;
}
.milestone-container .date {
    color: #00b0f0;
    font-weight: bolder;
    font-size: large;
}
.milestone-container .text {
    color: var(--text-primary-colour);
    font-size: medium;
}
.milestone-container .text::before {
    content: '● ';
    font-size: large;
}
/* ====== end 页面样式 ====== */