每一个悬停、每一次聚焦，都像是书页轻轻翻开，安静而富有仪式感。

.search_box {
    background: url("https://img0.baidu.com/it/u=2260621792,3841037312&fm=253&fmt=auto&app=138&f=JPEG?w=1200&h=800");
    background-size: cover;
    background-position: center;
    position: relative;
    transition: transform 0.3s ease;
}
.search_box::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0%;
    height: 2px;
    background: rgba(255, 255, 255, 0.3);
    transition: width 0.7s cubic-bezier(0.2, 0.9, 0.4, 1.1);
}
.search_box:hover::after {
    width: 100%;
}
.search_box:hover {
    transform: translateX(4px);
}

#result {
    background: url("https://img0.baidu.com/it/u=4269801729,3144187284&fm=253&fmt=auto&app=138&f=JPEG?w=800&h=1227");
    background-size: cover;
    background-position: center;
    position: relative;
}
#result::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0%;
    height: 2px;
    background: rgba(255, 255, 255, 0.2);
    transition: width 0.8s cubic-bezier(0.2, 0.9, 0.4, 1.1);
}
#result:hover::after {
    width: 100%;
}

#main, #text {
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    transition: background 0.4s ease, backdrop-filter 0.4s ease;
    position: relative;
}
#main::before, #text::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 0%;
    height: 100%;
    background: rgba(255, 255, 255, 0.04);
    transition: width 0.6s cubic-bezier(0.2, 0.9, 0.4, 1.1);
    pointer-events: none;
}
#main:hover::before, #text:hover::before {
    width: 100%;
}
#main:hover, #text:hover {
    background: rgba(0, 0, 0, 0.55);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

#text, #text a {
    color: #dddddd;
    text-decoration: none;
    position: relative;
    transition: color 0.3s ease;
}
#text a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0%;
    height: 1px;
    background: #dddddd;
    transition: width 0.5s cubic-bezier(0.2, 0.9, 0.4, 1.1);
}
#text a:hover::after {
    width: 100%;
}
#text a:hover {
    color: #ffffff;
}

#search_button {
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    border: none;
    cursor: pointer;
    transition: all 0.35s ease;
    position: relative;
    overflow: hidden;
}
#search_button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.08);
    transition: left 0.5s cubic-bezier(0.2, 0.9, 0.4, 1.1);
}
#search_button:hover::before {
    left: 0%;
}
#search_button:hover {
    background: rgba(0, 0, 0, 0.7);
    transform: translateY(-1px);
}
#search_button:active {
    transform: scale(0.97);
}

#search_input {
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all 0.4s ease;
    position: relative;
}
#search_input:focus {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    box-shadow: 0 0 0 2px rgba(255, 255, 255, 0.15);
    outline: none;
    transform: translateX(4px);
}
#search_input::placeholder {
    transition: transform 0.4s ease, opacity 0.4s ease;
}
#search_input:focus::placeholder {
    transform: translateX(8px);
    opacity: 0.5;
}

@media screen and (min-width: 630px) {
    .background {
        background: url("https://img.hk/i/2024/06/02/665c511151e06.png");
        background-size: cover;
        background-position: center;
        animation: slideInBg 0.9s cubic-bezier(0.2, 0.9, 0.4, 1.1) forwards;
    }
    @keyframes slideInBg {
        0% {
            background-position: 100% center;
            filter: brightness(0.7);
        }
        100% {
            background-position: center;
            filter: brightness(1);
        }
    }
}

.search_box,
#result,
#main,
#text,
#search_button,
#search_input {
    opacity: 0;
    animation: slideFromLeft 0.7s cubic-bezier(0.2, 0.9, 0.4, 1.1) forwards;
}
.search_box { animation-delay: 0.02s; }
#result { animation-delay: 0.06s; }
#main { animation-delay: 0.10s; }
#text { animation-delay: 0.14s; }
#search_button { animation-delay: 0.18s; }
#search_input { animation-delay: 0.22s; }

@keyframes slideFromLeft {
    0% {
        opacity: 0;
        transform: translateX(-18px) scale(0.98);
        clip-path: inset(0 100% 0 0);
    }
    100% {
        opacity: 1;
        transform: translateX(0) scale(1);
        clip-path: inset(0 0% 0 0);
    }
}

.divider-line {
    width: 0%;
    height: 1px;
    background: rgba(255, 255, 255, 0.15);
    margin: 0 auto;
    transition: width 0.7s cubic-bezier(0.2, 0.85, 0.4, 1);
}
.divider-line.animate {
    width: 100% !important;
}

::-webkit-scrollbar {
    width: 3px;
    height: 3px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 10px;
    transition: background 0.3s ease;
}
::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.4);
}

另外 @阿呆 HU.IS什么时候添加自定义CSS功能