:root {
  color-scheme: light;
  --background: #F7F7F8;
  --card: #FFFFFF;
  --text: #1C1C1E;
  --secondary: #6B6B70;
  --blue: #1D5FD6;
  --separator: rgba(0, 0, 0, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--background);
  color: var(--text);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

.page {
  max-width: 1040px;
  margin: 0 auto;
  padding: 0 24px 48px;
}

.layout {
  display: grid;
  grid-template-columns: 208px minmax(0, 720px);
  justify-content: space-between;
}

.toc {
  display: block;
  position: sticky;
  top: 32px;
  align-self: start;
  padding-top: 14px;
  font-size: 15px;
  line-height: 1.4;
}

.toc a {
  display: block;
  padding: 6px 0;
  color: var(--secondary);
}

.toc a:hover {
  color: var(--text);
  text-decoration: none;
}

a {
  color: var(--blue);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* 页头 */

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  margin-bottom: 72px;
  border-bottom: 1px solid var(--separator);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-weight: 600;
  letter-spacing: -0.01em;
}

.brand:hover {
  text-decoration: none;
}

.brand svg {
  width: 30px;
  height: 30px;
  display: block;
}

nav {
  display: flex;
  gap: 24px;
  font-size: 15px;
}

nav a {
  color: var(--secondary);
}

nav a[aria-current="page"] {
  color: var(--text);
}

/* 标题和正文 */

h1 {
  margin: 0 0 10px;
  font-size: 40px;
  line-height: 1.1;
  font-weight: 600;
  letter-spacing: -0.022em;
}

.lede {
  margin: 0 0 40px;
  color: var(--secondary);
  font-size: 19px;
  line-height: 1.5;
}

.updated {
  margin: 0 0 40px;
  color: var(--secondary);
  font-size: 15px;
}

h2 {
  margin: 56px 0 14px;
  font-size: 22px;
  line-height: 1.25;
  font-weight: 600;
  letter-spacing: -0.012em;
}

p {
  margin: 0 0 12px;
}

ul {
  margin: 0 0 12px;
  padding-left: 22px;
}

li {
  margin-bottom: 6px;
}

address {
  font-style: normal;
}

.card {
  background: var(--card);
  border-radius: 18px;
}

/* 隐私政策：顶上的四条要点，正文 */

.summary {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 26px 36px;
  margin: 0 0 40px;
  padding: 28px;
  list-style: none;
}

.summary li {
  margin: 0;
  padding-left: 32px;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'%3E%3Ccircle cx='10' cy='10' r='10' fill='%231C1C1E'/%3E%3Cpath d='M5.8 10.4l2.8 2.8 5.6-6' fill='none' stroke='%23fff' stroke-width='1.8' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") no-repeat 0 3px / 20px 20px;
}

.summary strong {
  display: block;
  font-weight: 600;
  letter-spacing: -0.005em;
}

.summary span {
  display: block;
  margin-top: 2px;
  color: var(--secondary);
  font-size: 15px;
  line-height: 1.45;
}

.policy h2 {
  margin: 44px 0 8px;
  font-size: 20px;
}

/* 支持页：联系我们的卡片，分组的问答 */

.contact {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 24px 28px;
}

.contact h2 {
  margin: 0 0 4px;
  font-size: 19px;
}

.contact p {
  margin: 0;
  color: var(--secondary);
  font-size: 15px;
  line-height: 1.5;
}

.button {
  flex: none;
  display: inline-flex;
  align-items: center;
  height: 46px;
  padding: 0 22px;
  border-radius: 13px;
  background: var(--blue);
  color: #FFFFFF;
  font-weight: 500;
}

.button:hover {
  text-decoration: none;
}

.qa {
  padding: 22px 28px 24px;
}

.qa + .qa,
.row + .row {
  border-top: 1px solid var(--separator);
}

h3 {
  margin: 0 0 6px;
  font-size: 17px;
  line-height: 1.4;
  font-weight: 600;
}

.qa > :last-child {
  margin-bottom: 0;
}

.row::after {
  content: "";
  flex: none;
  width: 8px;
  height: 8px;
  margin-right: 4px;
  border-right: 2px solid #C4C4C7;
  border-bottom: 2px solid #C4C4C7;
  transform: rotate(-45deg);
}

.note {
  margin-top: 40px;
  color: var(--secondary);
  font-size: 15px;
}

/* 首页 */

.hero {
  max-width: 720px;
  padding: 24px 0 8px;
}

.hero svg {
  width: 88px;
  height: 88px;
  display: block;
  margin-bottom: 28px;
}

.hero p {
  margin: 0 0 48px;
  color: var(--secondary);
  font-size: 21px;
  line-height: 1.4;
}

.row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 24px;
  color: var(--text);
}

.row:hover {
  text-decoration: none;
}

.row strong {
  display: block;
  font-weight: 500;
}

.row span {
  display: block;
  color: var(--secondary);
  font-size: 15px;
}

/* 页脚 */

footer {
  display: flex;
  justify-content: space-between;
  gap: 32px;
  margin-top: 96px;
  padding-top: 24px;
  border-top: 1px solid var(--separator);
  color: var(--secondary);
  font-size: 13px;
  line-height: 1.6;
}

footer p {
  margin: 0;
}

footer nav {
  flex: none;
  gap: 20px;
  font-size: 13px;
}

h2[id] {
  scroll-margin-top: 28px;
}

@media (max-width: 960px) {
  .page {
    max-width: 768px;
  }

  .layout {
    display: block;
  }

  .toc {
    display: none;
  }
}

@media (max-width: 600px) {
  .page {
    padding: 0 20px 40px;
  }

  header {
    height: 60px;
    margin-bottom: 44px;
  }

  h1 {
    font-size: 32px;
  }

  .lede {
    font-size: 18px;
  }

  h2 {
    margin-top: 44px;
    font-size: 20px;
  }

  .summary {
    grid-template-columns: 1fr;
    gap: 20px;
    padding: 22px 20px;
  }

  .contact {
    flex-direction: column;
    align-items: flex-start;
    gap: 18px;
    padding: 22px 20px;
  }

  .qa {
    padding: 20px 20px 22px;
  }

  .row {
    padding-left: 20px;
    padding-right: 20px;
  }

  footer {
    flex-direction: column;
    gap: 16px;
    margin-top: 72px;
  }
}