/* ==================== CSS 变量定义 ==================== */
:root {
  /* 颜色 */
  --color-primary: #006aff;
  --color-nav-hover: #EBF6FC;
  --color-primary-dark: #003d7a;
  --color-primary-light: #006aff49;
  --color-white: #ffffff;
  --color-black: #000000;
  --color-gray: #777777;
  --color-border: #bebebe;
  --color-text-dark: #01153a;

  /* 间距 */
  --spacing-xs: 0.42vw;
  --spacing-sm: 1.04vw;
  --spacing-md: 2.08vw;
  --spacing-lg: 4.22vw;
  --spacing-xl: 8.44vw;

  /* 字体大小 */
  --font-xs: 0.73vw;
  --font-sm: 0.83vw;
  --font-base: 1.04vw;
  --font-md: 1.25vw;
  --font-lg: 1.67vw;
  --font-xl: 2.08vw;
  --font-2xl: 2.5vw;

  /* 边框 */
  --border-thin: 0.05vw;
  --border-base: 0.1vw;
  --border-radius: 2.34vw;
  --border-radius-sm: 0.52vw;

  /* 过渡 */
  --transition-base: all 0.3s ease;
}

/* ==================== 全局样式 ==================== */
* {
  box-sizing: border-box;
  margin: 0 auto;
}

.frame {
  display: flex;
  flex-direction: column;
  align-items: center;
  background: var(--color-white);
  overflow: hidden;
}

/* ==================== 按钮样式 ==================== */
.btn-text {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 9.69vw;
  height: 2.08vw;
  line-height: 3.33vw;
  letter-spacing: 0.34vw;
  color: var(--color-white);
  font-family: "HarmonyOS Sans", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", SimHei, Arial, Helvetica, sans-serif;
  font-size: var(--font-md);
  font-weight: 700;
}

.btn-primary {
  display: flex;
  flex-grow: 1;
  align-items: flex-start;
  margin-left: -0.05vw;
  border: var(--border-base) solid var(--color-white);
  border-radius: var(--border-radius);
  background: #001c4575;
  padding: 0.52vw var(--spacing-sm) 0.36vw 1.09vw;
  cursor: pointer;
  transition: var(--transition-base);
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  transform: translateY(-0.2vw);
  box-shadow: 0 0.3vw 0.6vw rgba(109, 133, 167, 0.3);
}

/* ==================== 头部Banner区域 ==================== */
.header-banner {
  display: flex;
  flex-direction: column;
  align-items: center;
  align-self: stretch;
  width: 100vw;
  height: 51.2vw;
  overflow: hidden;
  background-image: linear-gradient(180deg, #006aff49 0%, #00000080 100%),
    url(../img/banner.webp);
  background-position: center;
  background-size: cover;
  background-repeat: no-repeat;
  padding-top: 6.77vw;
  box-sizing: border-box;
}

/* ==================== 头部导航 ==================== */
.header-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  align-items: flex-start;
  width: 100vw;
  height: 6.77vw;
  overflow: hidden;
  z-index: 1000;
  transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

.header-nav.scrolled {
  background: rgba(1, 21, 58, 1);
  box-shadow: 0 0.3vw 1.5vw rgba(0, 0, 0, 0.2);
}

.nav-container {
  display: flex;
  flex-grow: 1;
  align-items: center;
  justify-content: space-between;
  width: 100vw;
  height: 6.77vw;
}

.logo-wrapper {
  display: flex;
  align-items: center;
  gap: 1.04vw;
  width: auto;
  height: 4.79vw;
  cursor: pointer;
  transition: opacity 0.3s ease;
}

.logo-wrapper:hover {
  opacity: 0.8;
}

.logo-img {
  width: 15.26vw;
  height: 4.792vw;
  flex-shrink: 0;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  height: 4.79vw;
}

.nav-item {
  display: inline-flex;
  position: relative;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-xs) var(--spacing-sm);
  text-decoration: none;
  transition: var(--transition-base);
}

.nav-item.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 70%;
  height: 0.15vw;
  background: var(--color-white);
  transition: var(--transition-base);
}

.nav-item:hover::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 70%;
  height: 0.15vw;
  background: var(--color-primary);
  transition: var(--transition-base);
}

.nav-text {
  flex-shrink: 0;
  line-height: 1.2;
  letter-spacing: 0.02vw;
  color: var(--color-white);
  font-family: "HarmonyOS Sans", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", SimHei, Arial, Helvetica, sans-serif;
  font-size: var(--font-base);
  white-space: nowrap;
  transition: var(--transition-base);
}

.nav-item:hover .nav-text {
  color: rgb(108, 159, 230);
}

/* ==================== Banner内容区 ==================== */
.banner-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-top: 12.45vw;
  width: 100%;
  text-align: center;
}

.banner-title {
  width: 100%;
  line-height: 1.2;
  letter-spacing: 1.05vw;
  color: #ffffff;
  font-family: "Noto Sans", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", SimHei, Arial, Helvetica, sans-serif;
  font-size: 2.5vw;
  font-weight: 900;
  margin-bottom: 1.04vw;
}

.banner-subtitle {
  width: 100%;
  line-height: 1.2;
  letter-spacing: 0.82vw;
  color: #ffffff;
  font-family: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", SimHei, Arial, Helvetica, sans-serif;
  font-size: 1.67vw;
}

.banner-button-wrapper {
  display: flex;
  align-items: center;
  align-self: stretch;
  margin: 7.97vw 44.01vw 0px;
  box-shadow: 0px 0.21vw 0.21vw 0px #d8707040;
  padding-right: 0.05vw;
  width: 12.031vw;
  height: 3.177vw;
}

/* ==================== 页脚区域 ==================== */
.footer {
  width: 100%;
  background: var(--color-text-dark);
  padding: 3.906vw 0 2.604vw;
  color: var(--color-white);
}

.footer-main {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 3.125vw;
  padding: 0 12.5vw;
  text-align: left;
}

.footer-column {
  display: flex;
  flex-direction: column;
  text-align: left;
}

.footer-column-left {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  gap: 0.25vw;
  align-items: flex-start;
  text-align: left;
  margin: 0;
}

.footer-column-right {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  text-align: right;
  margin: 0;
}

.footer-logo {
  width: 13.021vw;
  height: auto;
  display: block;
  margin: 0;
  cursor: pointer;
  transition: opacity 0.3s ease;
}

.footer-logo:hover {
  opacity: 0.8;
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 1.042vw;
  flex-wrap: nowrap;
  margin: 0;
}

.footer-nav-link {
  color: var(--color-white);
  text-decoration: none;
  font-size: 0.833vw;
  font-weight: 400;
  transition: var(--transition-base);
  white-space: nowrap;
  text-align: left;
}

.footer-nav-link:hover {
  color: var(--color-primary);
}

.footer-nav-separator {
  color: var(--color-white);
  opacity: 0.5;
  font-size: 1.25vw;
}

.footer-contact-title {
  font-size: 0.833vw;
  font-weight: 700;
  color: var(--color-white);
  margin: 0 0 1.042vw 0;
  letter-spacing: 0.04vw;
  text-align: left;
}

.footer-contact {
  font-style: normal;
  display: flex;
  flex-direction: column;
  gap: 0.521vw;
  align-items: flex-start;
}

.footer-contact-item {
  display: flex;
  align-items: flex-start;
  gap: 0;
  margin: 0;
  line-height: 1.8;
  text-align: left;
}

.footer-contact-label {
  font-size: 0.729vw;
  color: var(--color-white);
  opacity: 0.9;
  white-space: nowrap;
  flex-shrink: 0;
}

.footer-contact-value {
  font-size: 0.729vw;
  color: var(--color-white);
  opacity: 0.9;
  text-decoration: none;
  transition: var(--transition-base);
  word-wrap: break-word;
  text-align: left;
  display: inline-block;
  max-width: 35vw;
}

.footer-contact-address {
  display: block;
  max-width: none;
  text-align: left;
  line-height: 1.5;
}

.footer-contact-value:hover,
a.footer-contact-value:hover {
  color: var(--color-primary);
  opacity: 1;
}

.footer-divider {
  width: calc(100% - 25vw);
  height: 0.052vw;
  background: var(--color-white);
  opacity: 0.3;
  border: none;
  margin: 0 12.5vw 2.083vw;
}

.footer-bottom {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.521vw;
  text-align: center;
  padding: 0 12.5vw;
}

.footer-copyright,
.footer-icp {
  font-size: 0.833vw;
  color: var(--color-white);
  opacity: 0.8;
  margin: 0;
  line-height: 1.8;
}

.footer-icp-link {
  color: var(--color-white);
  text-decoration: none;
  transition: var(--transition-base);
}

.footer-icp-link:hover {
  color: var(--color-primary);
  opacity: 1;
}

.footer-legal {
  display: flex;
  align-items: center;
  gap: 1.042vw;
}

.footer-legal-link {
  font-size: 0.833vw;
  color: var(--color-white);
  text-decoration: none;
  opacity: 0.8;
  transition: var(--transition-base);
}

.footer-legal-link:hover {
  color: var(--color-primary);
  opacity: 1;
}

.footer-legal-separator {
  color: var(--color-white);
  opacity: 0.5;
  font-size: 1.042vw;
}

/* ==================== 子页面英雄区域 ==================== */
.header-banner.sub-page {
  height: 19.531vw;
  min-height: auto;
  background-image: url('../img/hero-sub_bg.webp');
  background-size: cover;
  background-position: center;
  padding-top: 6.77vw;
}

.header-banner.sub-page .banner-content,
.header-banner.sub-page .banner-button-wrapper {
  display: none;
}