/* 
@font-face {
    font-family: "a";
     中文字体：暂时注释掉空的 src，避免发起无效网络请求阻塞渲染 
     src: url(../fonts/行楷简体.ttf); 
    font-display: swap;
}
*/
@font-face {
    font-family: "b";
    src: url(../fonts/Ubuntu-Regular.ttf);
    font-display: swap;
}

@font-face {
    font-family: "title";
    /* 英文字体 */
    src: url(../fonts/Pacifico-Regular.ttf);
    font-display: swap;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    user-select: none;
    /* 【性能优化】：移除了极度消耗性能的全局 transition: background-color 0.2s ease; */
}

a:hover,
a:link,
a:visited,
a:active,
a:focus {
    text-decoration: none;
    outline: none;
    border: none;
    color: inherit;
    -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
}

/* 设置滚动条样式 */
::-webkit-scrollbar {
    width: 0px;
}

::-webkit-scrollbar-thumb {
    background-color: var(--main_text_color, #000000);
    border-radius: 8px;
    height: 20%;
}

::-webkit-scrollbar-track {
    background-color: var(--main_bg_color, linear-gradient(50deg, #a2d0ff, #ffffff));
}

html, html[data-theme="Light"] {
    --name: "Theme_Light";
    --main_bg_color: url(../img/background.jpg);
    --main_text_color: #000000;
    --gradient: linear-gradient(120deg, #bd34fe, #e0321b 30%, #41d1ff 60%);
    --purple_text_color: #747bff;
    --text_bg_color: rgb(121 163 231);
    --item_bg_color: rgba(249, 250, 251, 0.42);
    --item_hover_color: rgba(244, 245, 246, 0.8);
    --item_left_title_color: #000000;
    --item_left_text_color: #494949;
    --footer_text_color: #ffffff;
    --left_tag_item: linear-gradient(50deg, #a2d1ff, #ffffff);  /*小tag背景*/
    --card_filter: 0px;       /* 保持 0 提升性能 */
    --back_filter: 20px;      /* 背景模糊 */
    --back_filter_color: #00000030;
    --fill: #000000;
}

/* [黑夜模式] - 基于主题 5：图片模糊背景＋黑色透明卡片 */
html[data-theme="Dark"] {
    --name: "Theme_Dark";
    --main_bg_color: url(../img/rainbow.jpg);
    --main_text_color: #eeeeee;
    --gradient: linear-gradient(120deg, #bd34fe, #e0321b 30%, #41d1ff 60%);
    --purple_text_color: #747bff;
    --text_bg_color: #00000040;
    --item_bg_color: #00000038;
    --item_hover_color: #33333338;
    --item_left_title_color: #ffffff;
    --item_left_text_color: #ffffff;
    --footer_text_color: #ffffff;
    --left_tag_item: linear-gradient(50deg, #ff7300, #ee4980ab);
    --card_filter: 0px;       /* 保持 0 提升性能 */
    --back_filter: 19px;      /* 背景模糊 */
    --back_filter_color: #00000030;
    --fill: #ffffff;
}

body {
    height: 100%;
    min-height: 100vh;
    width: 100%;
    position: relative;
    font-family: "b", "a", sans-serif;
    background: var(--main_bg_color);
    background-repeat: no-repeat;
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    transition: color 0.1s ease;
    color: var(--main_text_color);
}

.back-home-btn {
    position: fixed;
    top: 15px;
    right: 15px;
    z-index: 1000;
    padding: 8px 16px;
    background: rgba(255, 255, 255, 0.9);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    text-decoration: none;
    color: #555;
    font-size: 13px;
    font-weight: 500;
    /* 【性能优化】：仅对当前元素进行过渡动画 */
    transition: background-color 0.3s, color 0.3s;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}
.back-home-btn:hover {
    background: #000;
    color: #fff;
}

#epoch42-loading {
    background: radial-gradient(white, #d8eaff);
    background-size: 100%;
    background-position: center;
    height: 100%;
    width: 100%;
    position: fixed;
    z-index: 999999;
    margin-top: 0px;
    top: 0px;
    pointer-events: none;
    opacity: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    /* 加入淡出动画，配合 JS 的 opacity 调整 */
    transition: opacity 0.5s ease;
}

#epoch42-loading-center {
    height: 150px;
    width: 150px;
    position: relative;
    border-radius: 50%;
    background: #472eff;
    animation: zoom 1s linear infinite;
}

@keyframes zoom {
    0% { transform: scale(0); opacity: 1; }
    50% { opacity: 0.5; }
    100% { transform: scale(1); opacity: 0; }
}

.epoch42-filter {
    position: fixed;
    width: 100%;
    height: 100%;
    background: var(--back_filter_color);
    /* 保留最底层的全屏毛玻璃，只算一次，性能可控 */
    backdrop-filter: blur(var(--back_filter));
    -webkit-backdrop-filter: blur(var(--back_filter));
    z-index: -99999999;
}

.epoch42-main {
    width: 100%;
    margin: 0 auto;
    transition: transform 0.5s ease;
    max-width: 1150px;
    position: relative;
    display: flex;
    flex-direction: row;
}

.epoch42-left {
    overflow-y: scroll;
    width: 300px;
    height: 100vh;
    display: flex;
    padding: 0 15px;
    position: sticky;
    top: 0;
    left: 0;
    align-items: center;
    flex-direction: column;
}

.epoch42-left::-webkit-scrollbar {
    display: none;
}

.logo {
    flex-shrink: 0;
    width: 90%;
    position: relative;
    aspect-ratio: 1/1;
    margin-top: 50px;
    background-size: cover;
    border-radius: 50%;
}

.left-div {
    flex-shrink: 0;
    width: 100%;
    border-radius: 13px;
    margin-top: 15px;
    padding: 20px;
    /* 左侧大区块保留毛玻璃，提升质感 */
    backdrop-filter: blur(var(--card_filter));
    -webkit-backdrop-filter: blur(var(--card_filter));
    background: var(--item_bg_color);
}

.left-des {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.left-des-item {
    display: flex;
    align-items: center;
    line-height: 20px;
    font-size: 15px;
    margin-bottom: 5px;
    overflow: hidden;
}

.left-des-item i,
.left-des-item svg {
    width: 16px;
    height: 16px;
    fill: var(--fill);
    font-size: 18px;
    margin-right: 10px;
}

.left-tag {
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    padding: 14px;
}

.left-tag-item {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 28px;
    margin: 0px 5px 5px 0;
    padding: 10px;
    font-size: 13px;
    border-radius: 10px;
    background: var(--left_tag_item);
}

#line {
    width: 100%;
    height: auto;
    font-size: 13px;
    padding-left: 8px;
    scroll-snap-type: y mandatory;
    overflow-y: scroll;
}

#line li {
    list-style: none;
    position: relative;
    padding: 15px 0px 0px 15px;
    border-left: 2px solid #d5d5d5;
    border-radius: 0;
    scroll-snap-align: end;
    color: var(--main_text_color);
}

.focus {
    width: 8px;
    height: 8px;
    border-radius: 22px;
    background-color: rgb(255 255 255);
    border: 2px solid #fff;
    position: absolute;
    left: -5px;
    top: 50%;
}

#line li:first-child .focus:first-child {
    background-color: #aaffcd;
    animation: focus 1.8s ease infinite;
}

#line::-webkit-scrollbar {
    display: none;
}

.epoch42-right {
    width: calc(100% - 230px);
    display: flex;
    padding: 20px;
    position: relative;
    padding-bottom: 50px;
    flex-direction: column;
}

.welcome {
    font-size: 65px;
    font-weight: 800;
    margin: 20px 0;
}

.index-logo {
    flex-shrink: 0;
    width: 40%;
    margin-top: 30px;
    position: relative;
    max-width: 200px;
    aspect-ratio: 1/1;
    background-size: cover;
    border-radius: 50%;
    border: 0.5px solid #ffffff;
}

.description {
    font-size: 20px;
    margin-top: 7px;
}

.gradientText {
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    background-size: 200%;
    background-position: 0%;
    font-family: "title";
    animation: backgroundSizeAnimation 10s ease-in-out infinite;
    background-image: var(--gradient);
}

@keyframes backgroundSizeAnimation {
    0% { background-position: 100%; }
    25% { background-position: 50%; }
    50% { background-position: 0%; }
    75% { background-position: 50%; }
    100% { background-position: 100%; }
}

.purpleText {
    color: var(--purple_text_color);
    font-weight: 800;
}

.textBackground {
    font-weight: 800;
    background: var(--text_bg_color);
    border-radius: 5px;
    font-size: 17px;
    margin: 0 3px;
    padding: 2px 4px;
}

.iconContainer {
    width: 100%;
    height: 60px;
    display: flex;
    align-items: center;
    overflow-x: scroll;
    margin-top: 20px;
}

.iconContainer::-webkit-scrollbar {
    display: none;
}

.iconItem {
    width: 49px;
    height: 43px;
    box-sizing: border-box;
    border-radius: 7px;
    display: flex;
    margin-left: 10px;
    /* 【性能优化】：移除了小图标的毛玻璃特效，避免大量并发重绘 */
    background: var(--item_bg_color);
    align-items: center;
    justify-content: center;
    /* 补上单独的背景色过渡 */
    transition: width 0.3s ease, opacity 0.3s ease, transform 0.3s ease, background-color 0.2s ease;
    flex-shrink: 0;
}

.iconItem i,
.iconItem svg {
    width: 22px;
    height: 22px;
    fill: var(--fill);
    font-size: 22px;
    margin-right: 3px;
}

.switch {
    width: 55px;
    height: 43px;
    box-sizing: border-box;
    border-radius: 7px;
    display: flex;
    margin-left: 10px;
    /* 【性能优化】：移除了毛玻璃特效 */
    background: var(--item_bg_color);
    align-items: center;
    justify-content: center;
    transition: width 1s ease, opacity 1s ease, transform 1s ease, background-color 0.2s ease;
    flex-shrink: 0;
}

.iconTip {
    white-space: nowrap;
    display: none;
}

.iconItem:hover {
    width: 95px;
    transform: translateY(-2px);
    background: var(--item_hover_color);
}

.iconItem:hover .iconTip {
    display: block;
}

.switch:hover {
    width: 55px;
    background: var(--item_hover_color);
}

.tanChiShe {
    width: 85%;
}

.tanChiShe img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.title {
    display: flex;
    align-items: center;
    font-size: 26px;
    font-weight: 800;
    margin: 20px 0;
    transition: transform 0.4s ease;
}

.title i,
.title svg {
    margin-right: 8px;
    height: 26px;
    width: 26px;
    fill: var(--fill);
}

.title:hover {
    transform: translateY(-5px);
}

.projectList {
    display: flex;
    flex-wrap: wrap;
}

.projectItem {
    margin: 7px;
    display: flex;
    background-color: var(--item_bg_color);
    border-radius: 8px;
    padding: 15px;
    height: 100px;
    width: calc(25% - 15px);
    /* 【性能优化】：移除了大量卡片的毛玻璃特效，这是滚屏掉帧的最大元凶 */
    transition: opacity 0.5s ease, background-color 0.2s ease, border 0.2s ease, transform 0.3s ease;
}

.projectItem:hover {
    box-shadow: 0 8px 16px -4px #2c2d300c;
    transform: translateY(-2px);
}

.projectItem.pressed {
    transform: scale(0.9);
    background-color: var(--item_hover_color);
}

.projectItem:hover .projectItemLeft {
    width: 100%;
}

.projectItem:hover .projectItemRight {
    width: 0%;
}

.projectItem:hover .projectItemRight img {
    transform: rotate(40deg);
}

.projectItem:hover h1 {
    font-size: 18px;
}

.projectItemLeft p {
    font-size: 12px;
    margin-top: 15px;
    color: var(--item_left_text_color);
}

.projectItemLeft h1 {
    font-weight: normal;
    font-size: 16px;
    margin: 0px;
    transition: font-size 0.4s ease;
    color: var(--item_left_title_color);
}

.projectItemLeft {
    transition: width 0.4s ease;
    height: 100%;
    width: 80%;
}

.projectItemRight {
    overflow: hidden;
    transition: width 0.4s ease;
    display: flex;
    justify-content: center;
    align-items: center;
    width: 20%;
    height: 100%;
}

.projectItemRight img {
    height: 39px;
    width: 39px;
}

.skill {
    padding: 25px;
    width: 100%;
}

.skill img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.skill #skillWap {
    display: none;
}

footer {
    position: absolute;
    padding: 10px;
    text-align: center;
    width: 100%;
    /* 【性能优化】：底部也不需要毛玻璃，直接用背景色 */
    background: var(--item_bg_color);
    color: var(--footer_text_color);
    font-size: 13px;
    bottom: 0;
}

@media (min-width: 800px) {
    .index-logo {
        display: none;
    }
}

@media (max-width: 1150px) {
    .a { width: calc(50% - 20px); }
    .projectItem { margin: 10px; }
    .b { width: calc(50% - 20px); }
}

@media (max-width: 800px) {
    .epoch42-left { display: none; }
    .a .projectItemRight { display: none; }
    .a .projectItemRight img { display: none; }
    .a .projectItemLeft { width: 100%; }
    .a { width: calc(50% - 18px); margin: 9px; }
    .b { height: 110px; margin: 8px 15px; width: calc(100% - 30px); }
    .epoch42-right { width: 100%; }
    .tanChiShe { width: 100%; }
    .description { font-size: 4vw; }
    .welcome { font-size: 10vw; margin: 2vw 0; }
    .iconContainer { margin-top: 4vw; }
    .projectItem { padding: 10px; }
    .projectItemLeft p { font-size: 13px; }
    .projectItemLeft h1 { font-size: 18px; }
    .projectItem:hover h1 { font-size: 20px; }
    .skill #skillWap { display: block; }
    .skill #skillPc { width: 100%; height: auto; }
}

.tc {
    position: fixed;
    display: flex;
    visibility: hidden;
    width: 100vw;
    height: 100vh;
    /* 这里的弹窗背景可以保留毛玻璃，因为弹窗出现时用户不会滚动页面，性能开销可接受 */
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    background: rgba(20, 20, 20, 0.5);
    z-index: 99999;
    align-items: center;
    top: 0;
    justify-content: center;
    flex-direction: column;
}

.tc-main {
    z-index: 100000;
    width: 80%;
    max-width: 300px;
    min-height: 200px;
    background-color: #ffffff;
    border-radius: 15px;
    display: flex;
    transition: transform 0.2s linear;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    transform: translateY(30%) scale(0.5);
}

.tc-img {
    width: 100%;
    height: 100%;
}

.tc.active {
    visibility: visible;
}

.tc-main.active {
    transform: translateY(0) scale(1);
}

.onoffswitch {
    position: relative;
    width: 38px;
    height: 20px;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

.onoffswitch-checkbox { display: none; }
.onoffswitch-label { display: block; overflow: hidden; cursor: pointer; height: 100%; border-radius: 50px; }
.onoffswitch-inner { display: flex; justify-content: center; align-items: center; width: 200%; height: 100%; margin-left: -100%; transition: margin 0.2s ease-in 0s; }
.onoffswitch-inner:before, .onoffswitch-inner:after { display: flex; justify-content: center; align-items: center; float: left; width: 50%; height: 100%; padding: 0; font-size: 12px; color: white; font-family: Trebuchet, Arial, sans-serif; font-weight: bold; box-sizing: border-box; }
.onoffswitch-inner:before { content: ""; background-color: rgb(110 110 110 / 50%); color: #FFFFFF; text-align: left; }
.onoffswitch-inner:after { content: ""; background-color: #272727; color: #FAFAFA; text-align: right; }
.onoffswitch-switch { display: block; height: 70%; aspect-ratio: 1/1; background: #FFFFFF; position: absolute; top: 12.5%; bottom: 12.5%; right: 5px; border-radius: 20px; transition: right 0.2s ease-in 0s; }
.onoffswitch-checkbox:checked+.onoffswitch-label .onoffswitch-inner { margin-left: 0; }
.onoffswitch-checkbox:checked+.onoffswitch-label .onoffswitch-switch { right: 50%; }