*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body{
    font-family: "Microsoft Yahei", sans-serif;
    line-height: 1.6;
    background-color: #ffffff;
    color: #222222;
    transition: backgroun-color 0.3s, color 0.3s;
}

/* 暗黑模式类，js切换这个类到body上 */
body.dark{
    background-color: #1a1a1a;
    color: #eeeeee;
}

.navbar{
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 5%;
    background-color: #4070f4;
    color: white;
}

.nav-menu a{
    color:white;
    text-decoration: none;
    margin-left: 16px;
}

.hero{
    min-height: 60vh;
    display:flex;
    align-items:center;
    justify-content:center;
    text-align:center;
    padding:2rem;
}

.hero h1{
    font-size: 2.2rem;
    margin-bottom: 12px;
}

#switchTheme{
    margin-top:16px;
    padding:8px 16px;
    border:none;
    border-radius:4px;
    background-color:#4070f4;
    color:white;
    cursor:pointer;
}

.projects,.about{
    padding: 3rem 5%;
    max-width: 1200px;
    margin:0 auto;
}

.project-list{
    display: grid;
    grid-template-columns: repeat(auto-fill, min-max(280px, 1fr));
    gap:20px;
    margin-top:20px;
}

.project-card{
    border:1px solid #ccc;
    padding:16px;
    border-radius:8px;
}

body.dark .project-card{
    border-color:#444;
}

footer{
    text-align:center;
    padding:2rem;
}

/* 移动端适配 */
@media(max-width:768px){
    .hero h1{
        font-size:1.6rem;
    }
    .navbar{
        flex-direction:column;
        gap:8px;
    }
}
.del-btn {
  margin-top:10px;
  padding:4px 8px;
  background-color:#e53e3e;
  color:#fff;
  border:none;
  border-radius:4px;
  cursor:pointer;
}
.add-form {
  margin: 20px 0;
  padding: 20px;
  border: 1px solid #ccc;
  border-radius: 8px;
  background-color: #f9f9f9;
}

body.dark .add-form {
  background-color: #2d2d2d;
  border-color: #444;
}

.add-form h3 {
  margin-bottom: 12px;
}

.add-form input {
  display: block;
  width: 100%;
  margin-bottom: 10px;
  padding: 8px 10px;
  border: 1px solid #ccc;
  border-radius: 4px;
  box-sizing: border-box;
}

body.dark .add-form input {
  background-color: #1a1a1a;
  color: #eee;
  border-color: #555;
}

#addBtn {
  padding: 8px 20px;
  background-color: #4070f4;
  color: #fff;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}
/* 遮罩层 */
.edit-modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0,0,0,0.5);
  justify-content: center;
  align-items: center;
  z-index: 999;
}

/* 弹窗白色盒子 */
.edit-modal .modal-box{
  width: 500px;
  padding: 24px;
  background: #fff;
  border-radius: 10px;
}

body.dark .edit-modal .modal-box{
  background-color: #2d2d2d;
}

.edit-modal.active {
  display: flex;
}

.edit-modal input {
  display: block;
  width: 100%;
  margin-bottom: 12px;
  padding: 10px;
  border: 1px solid #ccc;
  border-radius: 6px;
  box-sizing: border-box;
  font-size:16px;
}

body.dark .edit-modal input {
  background-color: #1a1a1a;
  color: #eee;
  border-color: #555;
}

.edit-modal .btn-group{
  margin-top:15px;
}

#saveEdit {
  padding: 10px 20px;
  background-color: #4070f4;
  color: #fff;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  margin-right:10px;
  font-size:16px;
}
#cancelEdit {
  padding: 10px 20px;
  background-color: #999;
  color: #fff;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-size:16px;
}

.edit-btn {
  padding: 6px 12px;
  background-color: #28a745;
  color: white;
  border: none;
  border-radius:4px;
  cursor: pointer;
  margin-right:8px;
}
.hero-content{
    text-align:center;
}
.hero-sub{
    font-size:22px;
    color:#444;
    margin:12px 0;
}
.hero-text{
    max-width:720px;
    margin:0 auto 30px;
    font-size:18px;
    line-height:1.7;
    color:#555;
}
body.dark .hero-sub,
body.dark .hero-text{
    color:#cccccc;
}
.about{
    max-width: 1100px;  /* 把最大宽度放大，文字区域变宽 */
    margin: 80px auto 50px;
    padding: 0 40px;    /* 左右内边距适当调大一点，手机上不会贴边 */
}
.about p{
    font-size:17px;
    line-height:1.7;
    color:#333;
}
body.dark .about p{
    color:#ddd;
}

.about p{
    font-size:17px;
    line-height:1.7;
    color:#333;
}
body.dark .about p{
    color:#ddd;
}

.project-link-group{
  margin:12px 0;
}
.preview-btn{
  display:inline-block;
  padding:6px 14px;
  background:#4070f4;
  color:#fff;
  text-decoration:none;
  border-radius:6px;
  margin-right:10px;
}
.gitee-btn{
  display:inline-block;
  padding:6px 14px;
  background:#333;
  color:#fff;
  text-decoration:none;
  border-radius:6px;
}
body.dark .gitee-btn{
  background:#555;
}
.preview-btn:hover{
  background:#2b5cd9;
}
.gitee-btn:hover{
  background:#444;
}