* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    text-decoration: none;
    border: none;
    outline: none;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

:root {
    --main-color: #019241;
    --white-color: #fff;
    --bg-color: #ffffff;
    --second-bg-color: #f5f5f5;
    --card-bg: #f5f5f5;
    --border-color: #e0e0e0;
    --text-color: #333333;
    --text-light: #555555;
    --disabled-color: #ccc;
}

html {
    font-size: 62.5%;
}

/* Preloader styles */
#preloader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: #ffffff;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    transition: opacity 0.5s ease;
}

#preloader.fade-out {
    opacity: 0;
    pointer-events: none;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid #e0e0e0;
    border-top: 4px solid var(--main-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 2rem 9%;
    background: #ffffff;
    display: -webkit-box;
    display: -ms-flexbox; 
    display: flex;
    -webkit-box-pack: justify; 
    -ms-flex-pack: justify; 
    justify-content: space-between;
    -webkit-box-align: center; 
    -ms-flex-align: center; 
    align-items: center;
    z-index: 100;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

body {
    background: #ffffff;
    color: var(--text-color);
}

/* 所有 section 背景为白色 */
section {
    background: #ffffff;
}

/* 保留灰色卡片样式 */
.services-container .services-box,
.resume-list .resume-item,
.contact-box form,
.portfolio-box .live-github a {
    background: var(--card-bg);
    border-color: var(--border-color);
}

/* 保留灰色区域（如 resume 左侧按钮区域） */
.resume-box .resume-btn {
    background: var(--card-bg);
    border-color: var(--border-color);
    color: var(--text-color);
}

.resume-box .resume-btn.active {
    border-color: var(--main-color);
    color: var(--main-color);
    background: #e8f5e9;
}

/* 保留 icon 按钮灰色背景 */
.services-box .icon a,
.contact-detail i {
    background: var(--border-color);
}

/* 保留输入框灰色背景 */
.contact-box .field-box input,
.contact-box .field-box textarea {
    background: var(--card-bg);
    border-color: var(--border-color);
}

/* 其他元素保持白色背景 */
.header, nav, .home-img .img-box .img-item {
    background: #ffffff;
}

/* 隐藏主题切换按钮 */
.theme-toggle {
    display: none;
}

.logo {
    font-size: 3rem;
    color: var(--main-color);
    font-weight: 700;
}

nav a {
    font-size: 2rem;
    color: var(--text-color);
    font-weight: 500;
    margin-left: 3.5rem;
    transition: .5s;
}

nav a:hover, nav a.active {
    color: var(--main-color);
}

#menu-icon {
    font-size: 4rem;
    display: none;
    color: var(--text-color);
}

section {
    position: absolute;
    width: 100%;
    height: 100%;
    padding: 17rem 9% 2rem;
    visibility: hidden;
    opacity: 0;
    overflow: hidden;
}

section.active {
    visibility: visible;
    opacity: 1;
    overflow: auto;
}

.home {
    display: -webkit-box;
    display: -ms-flexbox; 
    display: flex;
    -webkit-box-align: center; 
    -ms-flex-align: center; 
    align-items: center;
    gap: 5rem;
}

.home-detail h1 {
    font-size: clamp(3.5rem, 10vw, 5.5rem);
    color: var(--text-color);
}

.home-detail h2 {
    display: inline-block;
    font-size: 3.2rem;
    margin-top: -1rem;
    color: var(--text-color);
}

.home-detail h2 span {
    position: relative;
    display: inline-block;
    color: transparent;
    -webkit-text-stroke: .07rem var(--main-color);
    animation: display-text 1000000s linear infinite;
    animation-delay: calc(-4s * var(--i));
}

@keyframes display-text {
    25%, 100% {
        display: none;
    }
}

.home-detail h2 span::before {
    content: attr(data-text);
    position: absolute;
    width: 0;
    border-right: .2rem solid var(--main-color);
    color: var(--main-color);
    white-space: nowrap;
    overflow: hidden;
    animation: fill-text 4s linear infinite;
}

@keyframes fill-text {
    10%, 100% {
        width: 0;
    }
    70%, 100% {
        width: 100%;
    }
}

.home-detail p {
    font-size: 1.6rem;
    margin: 1rem 0 2.5rem;
    color: var(--text-light);
}

.home-detail .btn-sci {
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -ms-flex-align: center;
    align-items: center;
}

.btn {
    display: inline-block;
    padding: 1rem 3rem;
    background: var(--main-color);
    border: .2rem solid var(--main-color);
    border-radius: 4rem;
    box-shadow: 0 0 1rem var(--main-color);
    font-size: 1.6rem;
    color: var(--white-color);
    font-weight: 500;
    transition: .5s;
}

.btn:hover {
    background: transparent;
    color: var(--main-color);
    box-shadow: none;
}

.home-detail .btn-sci .sci {
    margin-left: 2rem;
}

.home-detail .btn-sci .sci a {
    display: -webkit-inline-flex;
    display: -ms-inline-flex;
    display: inline-flex;
    padding: .1rem;
    border: .2rem solid var(--main-color);
    border-radius: 50%;
    font-size: 2rem;
    color: var(--main-color);
    margin: 0 .8rem;
    transition: .5s;
}

.home-detail .btn-sci .sci a:hover {
    background: var(--main-color);
    color: #ffffff;
    box-shadow: 0 0 1rem var(--main-color);
}

.home-img .img-box {
    position: relative;
    width: 32vw;
    height: 32vw;
    border-radius: 50%;
    padding: .5rem;
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-pack: center;
    -ms-flex-pack: center;
    justify-content: center;
    -webkit-box-align: center;
    -ms-flex-align: center;
    align-items: center;
    overflow: hidden;
}

.home-img .img-box::before, .home-img .img-box::after {
    content: '';
    position: absolute;
    width: 50rem;
    height: 50rem;
}

.home-img .img-box .img-item {
    position: relative;
    width: 100%;
    height: 100%;
    background: #ffffff;
    border-radius: 50%;
    border: .01rem solid var(--border-color);
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-pack: center;
    -ms-flex-pack: center;
    justify-content: center;
    z-index: 1;
    overflow: hidden;
}

.home-img .img-box .img-item img {
    position: absolute;
    top: 1rem;      /* 从 3rem 改为 0.5rem，缩小顶部间距 */
    left: 0;
    right: 0;
    display: block;
    width: 95%;       /* 从 85% 改为 98%，放大图片 */
    height: 95%;      /* 添加高度，让图片撑满 */
    object-fit: cover;
    margin: auto;     /* 居中显示 */
    mix-blend-mode: normal;
}

.heading {
    font-size: 4.5rem;
    text-align: center;
    margin-bottom: 2rem;
    color: var(--text-color);
}

.heading span {
    color: var(--main-color);
}

.services-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(30rem, 1fr));
    gap: 2rem;
}

.services-container .services-box {
    padding: 3rem 2.5rem;
    background: var(--card-bg);
    border: .2rem solid var(--border-color);
    border-radius: 1rem;
    transition: .5s;
}

.services-container .services-box:hover {
    border-color: var(--main-color);
    transform: scale(1.02);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.services-box .icon {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.services-box .icon i {
    font-size: 4.5rem;
    color: var(--main-color);
}

.services-box:hover .icon :not(a i) {
    color: var(--main-color);
} 

.services-box .icon a {
    display: inline-flex;
    background: var(--border-color);
    border-radius: 50%;
    padding: 1rem;
    transition: .5s;
}

.services-box:hover .icon a {
    background: var(--main-color);
}

.services-box .icon a i {
    font-size: 2.2rem;
    color: var(--text-color);
    transform: rotate(225deg);
    transition: 0.4s;
}

.services-box:hover .icon a i {
    color: #ffffff;
}

.services-box .icon a:hover i {
    transform: rotate(180deg);
}

.services-box h3 {
    font-size: 3rem;
    margin: .5rem 0 2rem;
    transition: .5s;
    color: var(--text-color);
}

.services-box:hover h3 {
    color: var(--main-color);
}

.services-box p {
    font-size: 1.6rem;
    color: var(--text-light);
}

.resume-container {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 5rem;
}

.resume-box h2 {
    font-size: 4.5rem;
    color: var(--text-color);
}

.resume-box p {
    font-size: 1.6rem;
    color: var(--text-light);
}

.resume-box .desc {
    margin: 2rem 0 2.5rem;
}

.resume-box .resume-btn {
    width: 100%;
    height: 5.3rem;
    background: var(--card-bg);
    border: .2rem solid var(--border-color);
    font-size: 1.6rem;
    color: var(--text-color);
    margin-bottom: 2rem;
    border-radius: .8rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

.resume-box .resume-btn.active {
    border-color: var(--main-color);
    color: var(--main-color);
    background: #e8f5e9;
}

.resume-detail {
    display: none;
}

.resume-detail.active {
    display: block;
}

.resume-box .heading {
    font-size: 3.5rem;
    text-align: left;
}

.resume-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(30rem,1fr));
    gap: 2rem;
    height: 45rem;
    overflow: auto;
}

.resume-list::-webkit-scrollbar {
    width: .7rem;
}

.resume-list::-webkit-scrollbar-thumb {
    background: transparent;
    border-radius: 1rem;
}

.resume-list:hover::-webkit-scrollbar-thumb {
    background: var(--main-color);
}

.resume-list .resume-item {
    background: var(--card-bg);
    border-radius: .8rem;
    padding: 3rem 2.5rem;
    height: calc((45rem - 2rem)/ 2);
    display: flex;
    flex-direction: column;
    justify-content: center;
    border: 1px solid var(--border-color);
}

.resume-item .year {
    color: var(--main-color);
}

.resume-item h3 {
    font-size: 2.2rem;
    color: var(--text-color);
}

.resume-item .company {
    position: relative;
    margin-left: 2rem;
    margin-bottom: 2rem;
    color: var(--text-light);
}

.resume-item .company::before {
    content: '';
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    padding: .5rem;
    background: var(--main-color);
    border-radius: 50%;
    margin-left: -2rem;
}

.resume-detail.skills .resume-list {
    grid-template-columns: repeat(auto-fit,minmax15rem, 1fr);
    height: auto;
    overflow: visible;
}

.resume-detail.skills .resume-item {
    position: relative;
    align-items: center;
    height: auto;
}

.resume-detail.skills .resume-item i {
    font-size: 8.5rem;
}

.resume-detail.skills .resume-item:hover i {
    color: var(--main-color);
}

.resume-detail.skills .resume-item span {
    position: absolute;
    top: -20%;
    background: #ffffff;
    color: var(--text-color);
    font-size: 1.6rem;
    padding: .5rem 1rem;
    border-radius: .6rem;
    pointer-events: none;
    opacity: 0;
    transform: scale(.9);
    transition: .2s;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.resume-detail.skills .resume-item:hover span {
    top: -25%;
    opacity: 1;
    transform: scale(1);
}

.resume-detail.about .resume-list {
    height: auto;
    grid-template-columns: repeat(auto-fit, minmax(25rem,1fr));
}

.resume-detail.about .resume-item {
    height: auto;
    padding: 0 0 .5rem;
    background: transparent;
    border: none;
    box-shadow: none;
}

.resume-detail.about .resume-item p {
    color: var(--main-color);
}

.resume-detail.about .resume-item p span {
    color: var(--text-color);
    margin-left: 1rem;
    font-size: 1.8rem;
}

.portfolio-container {
    display: grid;
    grid-template-columns: repeat(2,1fr);
    gap: 3rem;
}

.portfolio-box .numb {
    font-size: 4rem;
    -webkit-text-stroke: .07rem var(--text-color);
    color: transparent;
    line-height: 1;
}

.portfolio-detail {
    display: none;
}

.portfolio-detail.active {
    display: block;
}

.portfolio-box h3 {
    font-size: 3.5rem;
    margin: .8rem 0 2rem;
    color: var(--text-color);
}

.portfolio-box p {
    font-size: 1.6rem;
    color: var(--text-light);
}

.portfolio-box .tech {
    margin: 2rem 0;
    color: var(--main-color);
    border-bottom: .1rem solid var(--border-color);
    padding-bottom: 2rem;
}

.portfolio-box .live-github a {
    position: relative;
    display: inline-flex;
    padding: 1.3rem;
    font-size: 3rem;
    color: var(--text-color);
    border-radius: 50%;
    background: var(--card-bg);
    transition: .5s;
    border: 1px solid var(--border-color);
}

.portfolio-box .live-github a:hover {
    color: var(--main-color);
}

.portfolio-box .live-github a:first-child {
    margin-right: 1.5rem;
}

.portfolio-box .live-github a:first-child i {
    transform: rotate(135deg);
}

.portfolio-box .live-github a span {
    position: absolute;
    top: -60%;
    left: 50%;
    transform: translateX(-50%) scale(.9);
    font-size: 1.6rem;
    white-space: nowrap;
    padding: .5rem 1rem;
    border-radius: .6rem;
    pointer-events: none;
    background: var(--text-color);
    color: #ffffff;
    opacity: 0;
    transition: .2s;
}

.portfolio-box .live-github a:hover span {
    top: -70%;
    opacity: 1;
    transform: translateX(-50%) scale(1);
}

.portfolio-box .portfolio-carousel {
    width: 100%;
    height: 45rem;
    border-radius: 1rem;
    overflow: hidden;
}

.portfolio-carousel .img-slide {
    display: grid;
    grid-auto-flow: column;
    grid-auto-columns: 100%;
    gap: 2rem;
    height: inherit;
    transition: .5s;
}

.portfolio-carousel .img-item {
    height: auto;
}

.portfolio-carousel .img-item img {
    display: block;
    width: 100%;
    height: auto;
    max-height: 400px;
    object-fit: contain;
    border-radius: 1rem;
}

.portfolio-box .navigation {
    text-align: right;
    margin-top: 2rem;
}

.portfolio-box .navigation button {
    display: inline-flex;
    padding: .4rem;
    background: var(--card-bg);
    border: .2rem solid var(--main-color);
    border-radius: .6rem;
    font-size: 4rem;
    color: var(--main-color);
    cursor: pointer;
}

.portfolio-box .navigation button.disabled {
    border-color: var(--border-color);
    color: var(--disabled-color);
}

.portfolio-box .navigation .arrow-right {
    margin-left: 1.5rem;
}

.contact-container {
    display: grid;
    grid-template-columns: 1fr 1.3fr;
    gap: 3rem;
}

.contact-container .contact-box:first-child {
    align-self: center;
}

.contact-box h2 {
    font-size: 4.5rem;
    color: var(--text-color);
}

.contact-box {
    font-size: 1.6rem;
}

.contact-box .desc {
    margin: 1.5rem 0 2.5rem;
    color: var(--text-light);
}

.contact-box .contact-detail {
    display: flex;
    align-items: center;
    margin: 2rem 0;
}

.contact-detail i {
    display: inline-flex;
    background: var(--border-color);
    color: var(--main-color);
    font-size: 3rem;
    padding: 1.2rem;
    border-radius: .6rem;
    margin-right: 1.5rem;
}

.contact-detail .detail p:first-child {
    color: var(--main-color);
}

.contact-detail .detail p {
    color: var(--text-light);
}

.contact-box form {
    background: var(--card-bg);
    padding: 2.5rem 3.5rem 3.5rem;
    border-radius: 1rem;
    text-align: center;
    border: 1px solid var(--border-color);
}

.contact-box .heading {
    font-size: 3.5rem;
}

.contact-box .field-box {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}

.contact-box .field-box input,.contact-box .field-box textarea {
    padding: 1.5rem;
    background: #ffffff;
    border: .15rem solid var(--border-color);
    border-radius: .6rem;
    font-size: 1.6rem;
    color: var(--text-color);
}

.contact-box .field-box textarea {
    grid-column: 1 / -1;
    height: 26rem;
    resize: none;
}

.contact-box .field-box input:focus,.contact-box .field-box textarea:focus {
    border-color: var(--main-color);
    outline: none;
}

.contact-box .btn {
    margin-top: 2rem;
    cursor: pointer;
}

/* 响应式 */
@media screen and (max-width: 1200px) {
    html {
        font-size: 55%;
    }   
}

@media screen and (max-width: 992px) {
    header {
        padding: 2rem 4%;
    }

    section {
        padding: 10rem 4% 2rem;
    }
}

@media screen and (max-width: 810px) {
    .contact-box .field-box {
        grid-template-columns: 1fr;
    }
}

@media screen and (max-width: 768px) {
    #menu-icon {
        display: block;  /* 显示菜单图标 */
    }
	
	    /* 隐藏白天/黑夜切换按钮 */
    .theme-toggle {
        display: none !important;
    }

    nav {
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        padding: 1rem;
        background: #ffffff;
        border-top: .1rem solid var(--border-color);
        box-shadow: 0 .5rem 1rem rgba(0, 0, 0, 0.1);
        display: none;
        flex-direction: row;      /* 水平排列 */
        justify-content: center;
        align-items: center;
        gap: 1rem;
        flex-wrap: wrap;          /* 如果一行放不下则换行 */
        z-index: 99;
    }

    nav.active {
        display: flex !important;  /* 展开时用 flex 水平排列 */
    }

    nav a {
        display: inline-block;
        margin: 0;
        padding: 0.5rem 1rem;
        font-size: 1.8rem;
        color: var(--text-color);
        white-space: nowrap;       /* 文字不换行 */
    }

    /* 主题切换按钮样式 */
    .theme-toggle {
        display: inline-flex;
        margin: 0;
        padding: 0.5rem;
    }

    /* 其他手机端样式保持不变 */
    .home {
        flex-direction: column-reverse;
        justify-content: center;
        gap: 2rem;
    }

    .home-img .img-box {
        width: 35rem;
        height: 35rem;
    }

    .resume-container,
    .portfolio-container,
    .contact-container {
        grid-template-columns: 1fr;
    }

    .resume-container {
        gap: 3rem;
    }

    .portfolio-container .portfolio-box:first-child {
        order: 1;
    }

    .contact-box .field-box {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media screen and (max-width: 600px) {
    .home-img .img-box {
        width: 30rem;
        height: 30rem;
    }

    .contact-box .field-box {
        grid-template-columns: 1fr;
    }
}

@media screen and (max-width: 450px) {
    html {
        font-size: 50%;
    }
}

@media screen and (max-width: 400px) {
    .home-detail,.resume-box h2,.resume-box .heading,.resume-box .desc,.resume-detail.about .resume-item {
        text-align: center;
    }

    .home-detail .btn-sci {
        flex-direction: column-reverse;
    }

    .home-detail .btn-sci .sci {
        margin-left: 0;
        margin-bottom: 2rem;
    }

    .contact-box form {
        padding: 2.5rem 3rem 3.5rem;
    }

    .contact-box h2 {
        font-size: 3.5rem;
    }
}

/* PDF 预览区域样式 */
#pdf-preview-area {
    margin-top: 2rem;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    background: var(--card-bg) !important;
    border-radius: 1rem;
    padding: 2rem;
}

/* Services 模块 PDF 预览区域样式 */
#services-pdf-area {
    margin-top: 2rem;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    background: var(--card-bg) !important;
    border-radius: 1rem;
    padding: 2rem;
}

/* Services 模块卡片可点击样式 */
.services-box {
    cursor: pointer;
    transition: all 0.3s ease;
}

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

/* 手机端 PDF 适配 */
@media screen and (max-width: 768px) {
    #pdf-preview-iframe,
    #services-pdf-iframe {
        height: 60vh;
        min-height: 350px;
    }
}

@media screen and (max-width: 480px) {
    #pdf-preview-iframe,
    #services-pdf-iframe {
        height: 50vh;
        min-height: 300px;
    }
}

/* ========== 修复首页滚动问题 ========== */
section.active {
    visibility: visible;
    opacity: 1;
    overflow-y: auto;
    overflow-x: hidden;
    height: auto;
    min-height: 100%;
}

/* 手机端优化 */
@media screen and (max-width: 768px) {
    section.active {
        height: auto;
        min-height: 100vh;
        -webkit-overflow-scrolling: touch;
    }
    
    .home {
        padding-bottom: 5rem;
    }
}