/* 隐私政策 / 用户协议 / 关于我们 独立静态页面样式
   这三个页面不加载 base.css、doc.css 和 nav.js，
   样式完全自包含，确保页面无返回首页和站内跳转功能 */

:root {
  color-scheme: dark;
  --doc-bg: #050810;
  --doc-text: #dce6fb;
  --doc-heading: #eef3ff;
  --doc-muted: #98a8c5;
  --doc-card-border: rgba(154, 187, 255, .25);
  --doc-card-bg: rgba(10, 20, 43, .76);
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  min-height: 100vh;
  background: var(--doc-bg);
  color: var(--doc-text);
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans SC", sans-serif;
  font-size: 16px;
  line-height: 1.9;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* 与旧版页面保持一致的暗色 radial 背景，避免闪烁 */
body {
  background: radial-gradient(circle at top, #17284b 0%, #090e1c 46%, #050810 100%);
}

.shell {
  width: min(960px, calc(100% - 32px));
  margin-inline: auto;
}

/* ===== 页面容器 ===== */
.doc-page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  padding-bottom: 48px;
}

/* ===== Hero 头部 ===== */
.doc-hero {
  padding: 48px 0 28px;
}

.doc-hero__inner {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.doc-hero__eyebrow {
  margin: 0;
  font-size: 13px;
  letter-spacing: .22em;
  color: var(--doc-muted);
  text-transform: uppercase;
}

.doc-hero__title {
  margin: 0;
  font-size: clamp(28px, 5vw, 42px);
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--doc-heading);
}

.doc-hero__meta {
  margin: 0;
  font-size: 14px;
  color: var(--doc-muted);
}

.doc-hero__lead {
  margin: 0;
  font-size: 15px;
  color: var(--doc-text);
  max-width: 720px;
}

/* ===== 正文卡片 ===== */
.doc {
  padding: clamp(20px, 4vw, 42px);
  border: 1px solid var(--doc-card-border);
  border-radius: 14px;
  background: var(--doc-card-bg);
  box-shadow: 0 20px 60px rgba(0, 0, 0, .25);
  /* 长 URL（隐私政策里第三方 SDK 链接）必须在窄屏换行，
     否则会把整页撑到 784px 宽 */
  word-break: break-all;
  overflow-wrap: anywhere;
}

.doc h2 {
  margin: 2.2em 0 .8em;
  font-size: 20px;
  font-weight: 700;
  color: var(--doc-heading);
  letter-spacing: .02em;
}

.doc h2:first-child {
  margin-top: 0;
}

.doc h3 {
  margin: 1.8em 0 .6em;
  font-size: 17px;
  font-weight: 600;
  color: var(--doc-heading);
}

.doc p {
  margin: 0 0 1em;
}

.doc__li {
  padding-left: 1.2em;
  text-indent: -1.2em;
}

/* 目录 */
.doc__toc {
  margin: 1.5em 0;
  padding: 14px 18px;
  border: 1px solid var(--doc-card-border);
  border-radius: 8px;
  background: rgba(154, 187, 255, .06);
}

.doc__toc-title {
  margin: 0 0 6px;
  font-size: 14px;
  font-weight: 600;
  color: var(--doc-muted);
  letter-spacing: .1em;
}

.doc__toc ul {
  margin: 0;
  padding-left: 1.2em;
  list-style: none;
}

.doc__toc li {
  margin: 4px 0;
  font-size: 15px;
}

/* 关于我们页面 */
.doc__section {
  margin-bottom: 2em;
}

.doc__section:last-child {
  margin-bottom: 0;
}

.about-grid {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin: 1em 0 0;
}

.about-item {
  padding: 14px 16px;
  border: 1px solid var(--doc-card-border);
  border-radius: 8px;
  background: rgba(154, 187, 255, .05);
}

.about-item__label {
  margin: 0 0 4px;
  font-size: 13px;
  color: var(--doc-muted);
  letter-spacing: .06em;
}

.about-item__value {
  margin: 0;
  font-size: 15px;
  color: var(--doc-heading);
}

.about-item__value a {
  color: #acd2ff;
  text-decoration: none;
}

.about-item__value a:hover {
  text-decoration: underline;
}

/* 适龄提示 */
.about-age {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  margin-top: 1.5em;
  padding: 14px 16px;
  border: 1px solid var(--doc-card-border);
  border-radius: 8px;
  background: rgba(154, 187, 255, .04);
}

.about-age__mark {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--doc-card-border);
  border-radius: 6px;
  font-size: 18px;
  font-weight: 700;
  color: var(--doc-heading);
}

.about-age__text {
  margin: 0;
  font-size: 14px;
  color: var(--doc-muted);
  line-height: 1.7;
}

/* 页脚 */
.doc-page > footer {
  margin-top: auto;
  padding: 24px 16px 0;
  font-size: 13px;
  color: var(--doc-muted);
  text-align: center;
}

/* 小屏适配 */
@media (max-width: 640px) {
  .doc-hero {
    padding: 28px 0 20px;
  }

  .doc {
    padding: 20px 18px;
  }

  .doc h2 {
    font-size: 18px;
  }

  .doc h3 {
    font-size: 16px;
  }

  .about-grid {
    grid-template-columns: 1fr;
  }

  .about-age {
    flex-direction: column;
    gap: 10px;
  }
}