/* 全局样式 */
body {
    margin: 0;
    font-family:'Open Sans', 'Segoe UI', Arial, sans-serif;
    background-color: #f9fafc;
    color: #222;
    line-height: 1.6;
    padding-top: 132px;
}

/* ========== 导航栏 ========== */
.site-header {
    background: linear-gradient(90deg, rgba(255, 255, 255, 0.98), rgba(226, 242, 255, 0.96));
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    height: 118px;
    border-bottom: 1px solid rgba(32, 112, 142, 0.14);
    box-shadow: 0 14px 34px rgba(23, 54, 77, 0.13);
}

.site-header::before {
    content: "";
    position: absolute;
    inset: 0 0 auto 0;
    height: 4px;
    background: linear-gradient(90deg, #23a6b7, #4f8fe8, #7bbf8a);
}

.site-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
    max-width: min(1480px, calc(100% - 48px));
    margin: 0 auto;
    height: 100%;
}

.site-nav .logo {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    color: #14384e;
    text-decoration: none;
    flex: 0 0 auto;
    padding: 0;
    border-radius: 0;
}

.site-nav .logo img {
    height: 150px;
    width: auto;
    display: block;
    filter: drop-shadow(0 8px 14px rgba(35, 166, 183, 0.16));
}

.brand-copy {
    display: flex;
    flex-direction: column;
    line-height: 1.1;
    white-space: nowrap;
}

.brand-copy span {
    font-size: 1.45rem;
    font-weight: 800;
    color: #12374d;
}

.brand-copy small {
    margin-top: 0.2rem;
    color: #5f7c8d;
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0;
    text-transform: uppercase;
}

.nav-list {
    list-style: none;
    display: flex;
    align-items: center;
    gap: 0.18rem;
    margin: 0;
    padding: 0;
    min-width: 0;
}

.nav-list li {
    position: relative;
}

.site-nav a {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.82rem 1rem;
    text-decoration: none;
    color: #17364d;
    font-weight: 700;
    font-size: 1.12rem;
    line-height: 1;
    border-radius: 999px;
    transition:
        color 0.2s ease,
        background 0.2s ease,
        box-shadow 0.2s ease,
        transform 0.2s ease;
}

.site-nav a:hover,
.site-nav a:focus-visible,
.nav-dropdown:hover > .dropdown-toggle,
.nav-dropdown:focus-within > .dropdown-toggle {
    color: #067485;
    background: #eef8f8;
    box-shadow: inset 0 0 0 1px rgba(35, 166, 183, 0.16);
    transform: translateY(-1px);
}

.site-nav .logo:hover,
.site-nav .logo:focus-visible,
.site-nav .logo.nav-active {
    color: #14384e;
    background: transparent;
    box-shadow: none;
    transform: none;
}

.site-nav a:focus-visible {
    outline: 3px solid rgba(79, 143, 232, 0.28);
    outline-offset: 2px;
}

.site-nav a.nav-active,
.nav-dropdown.nav-active > .dropdown-toggle {
    color: #075f6e;
    background: linear-gradient(135deg, #e6f8f4, #eef4ff);
    box-shadow: inset 0 0 0 1px rgba(35, 166, 183, 0.24), 0 8px 18px rgba(23, 54, 77, 0.08);
}

.dropdown-toggle::after {
    content: "";
    width: 0.42rem;
    height: 0.42rem;
    border-right: 2px solid currentColor;
    border-bottom: 2px solid currentColor;
    transform: rotate(45deg) translateY(-2px);
    opacity: 0.65;
    transition: transform 0.2s ease;
}

.nav-dropdown:hover > .dropdown-toggle::after,
.nav-dropdown:focus-within > .dropdown-toggle::after {
    transform: rotate(225deg) translateY(-1px);
}

/* 下拉菜单 */
.dropdown-content {
    display: block;
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 240px;
    margin: 0;
    list-style: none;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.99), rgba(239, 248, 255, 0.98));
    border: 1px solid rgba(32, 112, 142, 0.12);
    border-radius: 8px;
    box-shadow: 0 18px 42px rgba(23, 54, 77, 0.16);
    padding: 0.55rem;
    z-index: 999;
    opacity: 0;
    transform: translateY(-8px);
    pointer-events: none;
    transition: 
        opacity 0.2s ease,
        transform 0.2s ease;
}

.dropdown-content::before {
    content: "";
    position: absolute;
    left: 1.1rem;
    top: -0.45rem;
    width: 0.85rem;
    height: 0.85rem;
    background: rgba(248, 252, 255, 0.99);
    border-left: 1px solid rgba(32, 112, 142, 0.12);
    border-top: 1px solid rgba(32, 112, 142, 0.12);
    transform: rotate(45deg);
}

/* 鼠标悬停时显示下拉内容 */
.nav-dropdown:hover .dropdown-content,
.nav-dropdown:focus-within .dropdown-content {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

.dropdown-content li a {
    color: #25475c;
    justify-content: flex-start;
    padding: 0.76rem 0.9rem;
    font-size: 1rem;
    font-weight: 650;
    border-radius: 6px;
    white-space: nowrap;
}

.dropdown-content li a:hover,
.dropdown-content li a:focus-visible,
.dropdown-content li a.nav-active {
    color: #075f6e;
    background: #eef8f8;
    box-shadow: none;
    transform: none;
}

@media (max-width: 1200px) {
    .site-nav {
        gap: 1rem;
        max-width: calc(100% - 24px);
    }

    .brand-copy {
        display: none;
    }

    .site-nav a {
        font-size: 1rem;
        padding: 0.72rem 0.76rem;
    }
}

@media (max-width: 900px) {
    body {
        padding-top: 112px;
    }

    .site-header {
        height: 98px;
    }

    .site-nav .logo img {
        height: 82px;
    }

    .nav-list {
        overflow-x: auto;
        overflow-y: visible;
        scrollbar-width: thin;
    }

    .dropdown-content {
        position: fixed;
        top: 96px;
        left: 12px;
        right: 12px;
        min-width: 210px;
        max-height: calc(100vh - 104px);
        overflow-y: auto;
    }

    .dropdown-content::before {
        display: none;
    }
}

/* ========== Hero 区域 ========== */
#hero {
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    height: 55vh;
    background: linear-gradient(rgba(11, 61, 145, 0.6), rgba(117, 163, 241, 0.6)),
                url('images/hero-bg.jpg') center/cover no-repeat;
    color: #ffffff;
    margin-top: 60px; /* 避开固定导航栏 */
    padding: 0 0;
}

.hero-container {
    text-align: center;
    transform: translateY(-35px);
}

.hero-container h1 {
    font-size: 4.5rem;
    margin-bottom: 16px;
    font-weight: 700;
    letter-spacing: 1px;
}

.hero-container .hero-tagline {
    font-size: 1.6rem;
    font-weight: 500;
    color: #a8d0ff;
    margin-bottom: 22px;
    letter-spacing: 0.5px;
}

.hero-container .hero-desc {
    font-size: 1.25rem;
    font-weight: 300;
    max-width: 820px;
    margin: 0 auto;
    line-height: 1.7;
    color: rgba(255, 255, 255, 0.9);
}

.hero-container h2 {
    font-size: 2rem;
    font-weight: 400;
    max-width: 700px;
    line-height: 1.8;
}

.hero-container h3 {
    font-size: 1.8rem;
    padding: 0.5rem 1.5rem;
}
.page-header {
  position: relative;
  overflow: hidden;
  width: min(1480px, calc(100% - 40px));
  max-width: none;
  box-sizing: border-box;
  margin: 0 auto 1.75rem;
  padding: 1.65rem 2.4rem;
  text-align: center;

  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.98), rgba(232, 244, 255, 0.96));
  color: #12374d;
  border-radius: 8px;
  border: 1px solid rgba(32, 112, 142, 0.14);
  box-shadow: 0 14px 30px rgba(23, 54, 77, 0.1);
}


.page-header::after {
  content: "";
  position: absolute;
  inset: auto 2.4rem 0;
  height: 1px;
  background: linear-gradient(90deg, rgba(35, 166, 183, 0.2), rgba(79, 143, 232, 0));
}

.statistics-page > .page-header {
  width: 100%;
}

.page-header .container,
.page-header > div {
  position: relative;
  z-index: 1;
  max-width: 1180px;
  margin: 0 auto;
}

.page-header h1 {
  color: #12374d;
  font-size: 2.3rem;
  line-height: 1.18;
  letter-spacing: 0;
  margin: 0 0 0.55rem;
  font-weight: 850;
}

.page-header .page-description {
  color: #496d84;
  font-size: 1.16rem;
  font-weight: 600;
  opacity: 1;
  line-height: 1.6;
  max-width: 1050px;
  margin: 0 auto;
}

@media (max-width: 900px) {
  .page-header {
    width: min(100% - 24px, 1480px);
    padding: 1.35rem 1.35rem 1.35rem 1.65rem;
  }

  .page-header h1 {
    font-size: 1.85rem;
  }

  .page-header .page-description {
    font-size: 1rem;
  }
}

main {
    padding: 10px;
}
.background {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: url('images/background2.png'); /* ✅ 修改成你的图片路径 */
  background-size: cover;
  background-repeat: no-repeat;
  background-position: center;
  z-index: -1; /* 在内容下面 */
  opacity: 0.05; /* 调整透明度 */
}

.simple-footer {
  text-align: center;
  font-size: 13px;
  color: #666;
  padding: 20px 10px;
  border-top: 1px solid #e5e5e5;
  line-height: 1.6;
}

.simple-footer a {
  color: #2a6ebb;
  text-decoration: none;
}

.simple-footer a:hover {
  text-decoration: underline;
}