/*==============================初始化==============================*/
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
html, body {
    height: 100%;
    width: 100%;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    gap: 20px;
}

body {
    font-family: Arial, "Microsoft YaHei", sans-serif;
    font-size: 16px;
    line-height: 1.5;
}

a {
    text-decoration: none;
}

input, button, textarea, select {
    border: none;
    outline: none;
    font: inherit;
}

button {
    cursor: pointer;
}

img {
    vertical-align: middle;
    max-width: 100%;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: normal;
}

hr {
    margin: 0;
    padding: 0;
}

/* 超小屏手机 */
@media (max-width: 575px) {
    body {
        gap: 120px;
    }
}

/* 小屏手机 */
@media (max-width: 767px) {
    body {
        gap: 15px;
    }
}

/* 平板 */
@media (max-width: 1023px) {
    body {
        gap: 20px;
    }
}

/* 大屏桌面 */
@media (max-width: 1439px) {
    body {
        gap: 25px;
    }
}

/* 应用主题变量 */
body {
    background: linear-gradient(to bottom,
        var(--common-color-1),
        var(--common-color-2));
    color: var(--common-text);

    min-height: 100vh;
    background-attachment: fixed;
    background-size: cover;
    background-repeat: no-repeat;
}

a {
    color: var(--common-text);
}

a:hover {
    color: var(--common-hover);
}

/* 卡片类元素 */
.header-card,
.left-asider-card,
.center-card,
.footer-card,
.footer-element-card,
.page-list-card {
    background-color: var(--common-bg);
    box-shadow: 0 2px 4px var(--common-shadow);
}

/* 中间布局容器 */
.mid-flex {
    max-width: 1400px;
    max-height: 650px;
    width: 100%;
    height: 100%;
    margin: 0 auto;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    flex-direction: row;
    gap: 20px;
}

/*============================== Center 区域样式 ==============================*/
.center-S {
  width: calc(100% - 15% - 20px);
  height: 100%;
  display: flex;
  justify-content: center;
}

.center-container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: center;
  align-items: flex-start;
}

.center-card {
  width: 100%;
  max-height: 600px;
  height: 600px;
  padding: 20px;
  border-radius: 8px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border: 2px solid var(--common-color-1);
}

.center-header-area {
  display: flex;
  flex-direction: column;
  height: 100%;
  overflow: hidden;
}

.center-header-area .center-head-card {
  flex-shrink: 0;
  width: 100%;
}

.center-header-area .center-card-content {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
}

/* Center 颜色 */
.center-card-content {
  background-color: var(--common-bg);
}

.center-head-card {
  background-color: var(--common-bg);
  transition: background-color 0.3s ease;
}

.center-head-card h2 {
  color: var(--common-color-1);
  transition: color 0.3s ease;
}

.center-card-content hr,
.center-card hr {
  border: none;
  height: 1px;
  background-color: var(--common-color-1);
  margin: 10px 0;
  transition: background-color 0.3s ease;
}

.center-card-bordered {
  border: 2px solid var(--common-color-1);
  transition: border-color 0.3s ease;
}

/* Center 响应式 */
@media (max-width: 576px) {
  .center-S {
    width: 100%;
    padding: 0 20px;
    display: flex;
    justify-content: center;
  }

  .center-container {
    width: 100%;
    max-width: 100%;
    display: flex;
    justify-content: center;
  }

  .center-card {
    width: 100%;
    max-width: 100%;
    height: auto;
    max-height: calc(100vh - 300px);
    padding: 15px;
    overflow-y: auto;
    border-radius: 12px;
  }
}

@media (max-width: 768px) {
  .center-S {
    width: 100%;
    padding: 0 25px;
    display: flex;
    justify-content: center;
  }

  .center-container {
    width: 100%;
    max-width: 100%;
    display: flex;
    justify-content: center;
  }

  .center-card {
    width: 100%;
    max-width: 100%;
    height: auto;
    max-height: calc(100vh - 280px);
    padding: 20px;
    overflow-y: auto;
    border-radius: 12px;
  }
}

@media (max-width: 1024px) {
  .center-S {
    width: calc(100% - 20% - 20px);
    padding: 0 15px;
    justify-content: center;
  }
  .center-card {
    height: 600px;
    border-radius: 8px;
  }
}

@media (max-width: 1200px) {
  .center-S {
    width: 1000px;
    padding: 0 10px;
    justify-content: center;
  }
  .center-card {
    height: 650px;
    border-radius: 8px;
  }
}

@media (max-width: 1440px) {
  .center-S {
    width: 1200px;
    padding: 0 10px;
    justify-content: center;
  }
  .center-card {
    height: 600px;
    border-radius: 8px;
  }
}