/* GNU Unifont（完整 Unicode 覆盖，含中文） */
@font-face {
  font-family: "Unifont";
  src: url("../font/unifont.woff2") format("woff2");
  font-weight: normal;
  font-style: normal;
  font-display: swap;
}

/* 全局设计变量与基础样式 */
:root {
  --c-primary: #0186f3;
  --c-primary-dark: #0168c9;
  --c-primary-soft: rgba(1, 134, 243, 0.1);
  --c-ink: #1d2023;
  --c-text: #3d4650;
  --c-muted: #78818d;
  --c-line: #e5eaf0;
  --c-bg: #f2f5f9;
  --c-white: #fff;
  --nav-h: 66px;
  --radius: 10px;
  --shadow-sm: 0 2px 10px rgba(20, 35, 60, 0.06);
  --shadow-md: 0 14px 34px rgba(20, 35, 60, 0.12);
  --font-title: "Unifont", "STKaiti", "KaiTi", Georgia, serif;
  --font-heading: "Unifont", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Unifont", "PingFang SC", "Microsoft YaHei", sans-serif;

  /* ===== 背景图明暗统一入口（全站唯一开关）=====
     改 --img-dim 一个数即可同时调整所有页面的背景图明暗：
     1    = 当前默认
     0.8  = 整体变亮 20%
     0.5  = 很亮，接近原图
     1.2  = 整体变暗 20%（超过 1 的遮罩会接近纯黑）
     各页面遮罩的渐变形状保持不变，只按比例缩放透明度。 */
  --img-dim: 0.65;
  /* 背景图未加载时的兜底底色 */
  --img-base: #0a1c2b;
}

* {
  box-sizing: border-box;
}

html,
body,
#app {
  min-height: 100%;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--c-text);
  background: #fff;
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5 {
  margin: 0;
  color: var(--c-ink);
  line-height: 1.35;
}

p {
  margin: 0;
}

code,
kbd,
samp,
pre {
  font-family: var(--font-body);
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  display: block;
  max-width: 100%;
}

.container {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

.container-narrow {
  max-width: 900px;
}

/* 通用按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 26px;
  border: 1px solid transparent;
  border-radius: 6px;
  font-size: 15px;
  font-family: var(--font-body);
  font-weight: 600;
  cursor: pointer;
  transition: background 0.18s, box-shadow 0.18s, transform 0.18s, color 0.18s;
  white-space: nowrap;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--c-primary);
  color: #fff;
  box-shadow: 0 6px 16px rgba(1, 134, 243, 0.28);
}

.btn-primary:hover {
  background: #0194ff;
}

.btn-light {
  background: #fff;
  color: var(--c-ink);
  border-color: var(--c-line);
}

.btn-light:hover {
  border-color: var(--c-primary);
  color: var(--c-primary);
}

.btn-outline-light {
  background: transparent;
  color: #fff;
  border-color: rgba(255, 255, 255, 0.55);
}

.btn-outline-light:hover {
  background: rgba(255, 255, 255, 0.14);
}

/* 通用标题组 */
.section-head {
  text-align: center;
  margin-bottom: 48px;
}

.section-head .eyebrow {
  display: inline-block;
  color: var(--c-primary);
  font-size: 13px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.section-head h2 {
  font-size: clamp(26px, 3.6vw, 38px);
  letter-spacing: 0.02em;
}

.section-head p {
  max-width: 720px;
  margin: 14px auto 0;
  color: var(--c-muted);
  font-size: 15px;
}

.section-head.light h2,
.section-head.light p {
  color: #fff;
}

/* 内页头图 */
.page-hero {
  position: relative;
  display: flex;
  align-items: center;
  min-height: 300px;
  padding: 72px 0;
  color: #fff;
  background: linear-gradient(135deg, #0b2237, #10476f);
  overflow: hidden;
}

.page-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 78% 20%, rgba(1, 134, 243, 0.45), transparent 55%);
  pointer-events: none;
}

.page-hero .container {
  position: relative;
  z-index: 1;
}

.page-hero h1 {
  color: #fff;
  font-size: clamp(30px, 4.4vw, 46px);
  margin-bottom: 12px;
}

.page-hero p {
  color: rgba(255, 255, 255, 0.82);
  font-size: 16px;
}

/* 页面进入动画 */
.fade-up {
  animation: fadeUp 0.6s ease both;
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@media (max-width: 760px) {
  .container {
    padding: 0 18px;
  }
  .btn {
    padding: 11px 20px;
    font-size: 14px;
  }
}