* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
:root {
  --primary-color: forestgreen;
  --primary-light: #7cc47c;
  --primary-dark: #0d6b0d;
  --text-dark: #2e4e3e;
  --background-light: #f1f8f1;
  --accent-color: #ffd43b;
}
.background-img {
  position: fixed;

  width: 100%;
  height: 120%;
  background: url("../img/Concert_2022.webp") no-repeat center center/cover;

  z-index: -1;
}

html {
  font-size: 62.5%;
  scroll-behavior: smooth;
}
body {
  font-family: Microsoft YaHei, sans-serif;
  line-height: 1.8;
  font-weight: 400;
  color: #555;
}
.grid {
  display: grid;
  row-gap: 9.6rem;
  column-gap: 4.8rem;
}
.grid--2--cols {
  grid-template-columns: 1fr 1fr;
}
.grid--4--cols {
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  margin: 2.2rem auto;
  padding: 3.2rem 0;
}
.grid--3-cols {
  grid-template-columns: repeat(3, 1fr);
}
.grid--footer {
  grid-template-columns: 1fr 2fr;
  gap: 3.2rem;
  align-items: center;
  justify-content: center;
}

.grid-center-v {
  align-items: center;
}

/*在背景图上面放置文本框*/
/* Footer */
.footer {
  position: relative;
  height: 30rem;
  margin-top: 4.8rem;
  border-top: 1px solid #eee;
  z-index: 100;
  background-color: white;
}
.form-containers {
  /* 表单居中 */
  display: flex;
}
.container {
  /* position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -30%); */

  flex: 1;
  margin-top: 6rem; /* 等于导航栏高度 */
  margin-bottom: 10rem; /* 等于页脚高度 */
  padding: 3.2rem;
  overflow-y: auto; /* 确保内容过多时可滚动 */
}

.form-container {
  margin: auto;
  background: linear-gradient(
    to right bottom,
    var(--primary-light),
    var(--primary-color)
  );
  border-radius: 11px;
  max-width: 80rem;
  /* 居中布局
  display: flex;
  align-items: center;
  justify-content: center; */
}
/* 左右布局容器 */
.flex-container {
  display: flex;
  gap: 20px;
  max-width: 1200px;
  margin: 0 auto;
  min-height: calc(100vh - 130px); /* 确保内容区高度足够 */
}
.container-l {
  /* position: absolute;
  top: 50%;
  left: 15%;
  transform: translate(-50%, -30%); */
  flex: 0 0 20rem;
  border-radius: 11px;
}
.container-r {
  /* position: absolute;
  top: 50%;
  left: 60%;
  transform: translate(-50%, -20%); */
  flex: 1; /* 自适应剩余宽度 */
  margin: 2rem auto;
  background-color: white;
  border-radius: 11px;
}

/* hero部分 */
.section-container {
  padding: 0 9.6rem;
  margin-bottom: 9.6rem;
}
/* .section-container:last-child {
  margin-bottom: 3.2rem;
} */

/***文字**/
.heading-primary,
.heading-secondary,
.heading-tertiary {
  font-weight: 700;
  color: #333;
}
.heading-primary {
  font-size: 5.2rem;
  line-height: 1.2;
  color: var(--text-dark);
  margin-bottom: 3.2rem;
}
.heading-aside {
  text-align: left;
}

.heading-secondary {
  font-size: 4.4rem;
  font-weight: 600;
  line-height: 1.4;
  color: var(--text-dark);
  margin-bottom: 4.4rem;
}
.heading-tertiary {
  font-size: 3.6rem;
  line-height: 1.2;
  color: var(--text-dark);

  margin: 2.2rem;
}
.subheading {
  display: block;
  font-size: 2.2rem;
  font-weight: 500;
  color: var(--primary-color);
  margin: 1.6rem auto;
  letter-spacing: 0.75px;
}
.head-top {
  margin-bottom: 2.2rem;
}
strong {
  font-weight: 500;
}
.text-c {
  text-align: center;
}
.gallery-href {
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 3.2rem;
}

/**btn*/
.btn:link,
.btn:visited {
  display: inline-block;

  font-size: 2rem;
  padding: 1.6rem 3.2rem;
  text-decoration: none;
  border-radius: 11px;
  color: inherit;
  transition: all 0.3s;

  border: none;
  cursor: pointer;
}

/*link*/
/*链接部分*/
.link:visited,
.link:link {
  font-size: 2.2rem;
  font-weight: 500;
  color: #333;
  display: inline-block;
  /*删除原有的下划线，不美观*/
  text-decoration: none;
  /*设置下划线的部分*/

  transition: all 0.3s;
}

.link:hover,
.link:active {
  color: var(--primary-dark);
}

/* 列表部分 */
.list {
  list-style-type: none;

  display: flex;
  flex-direction: column;
  gap: 1.6rem;
}
.list-item {
  display: flex;
  align-items: center;
  gap: 1.6rem;

  font-size: 2rem;
  font-weight: 500;
}
.list-icon {
  width: 3rem;
  height: 3rem;
  color: var(--primary-color);
}
* :focus {
  outline: none;
  box-shadow: inset 0 0 0 0.8rem rgba(34, 139, 34, 0.673);
}

.margin-right-sm {
  margin-right: 1.6rem;
}

.margin-bottom-md {
  margin-bottom: 6.4rem;
}

/*表单部分  */
.user-info {
  display: flex;
  align-items: center;
  gap: 10px;
}

.user-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background-color: var(--primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #333;
  font-weight: bold;
}