:root { color-scheme: light; }
* { box-sizing: border-box; }
html, body {
  margin: 0;
  padding: 0;
  min-height: 100%;
  background: #f0f1f6;
  color: #222;
  font-family: "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
}
a { color: inherit; text-decoration: none; }
a:hover { color: #f08a18; }

.help-topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  background: #fff;
  box-shadow: 0 0 5px rgba(0,0,0,.1);
}
.help-topbar-inner {
  display: flex;
  align-items: center;
  gap: 24px;
  width: min(1200px, 100%);
  min-height: 84px;
  margin: 0 auto;
  padding: 0 18px;
}
.help-topbar .logo {
  display: block;
  width: 240px;
  flex: 0 0 auto;
}
.help-topbar .logo img {
  display: block;
  width: 100%;
  height: auto;
}
.help-topbar nav {
  display: flex;
  align-items: center;
  gap: 0;
}
.help-topbar nav a {
  display: inline-flex;
  align-items: center;
  height: 36px;
  padding: 0 18px;
  border-radius: 4px;
  font-size: 16px;
  color: #111;
}
.help-topbar nav a:hover { background: #f8c21b; color: #fff; }

.help-shell {
  width: min(1200px, 100%);
  margin: 18px auto 40px;
  padding: 0 12px;
}
.help-title {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 88px;
  margin: 0;
  background: #fff;
  border-top: 1px solid #e8e8e8;
  border-bottom: 1px solid #e8e8e8;
  color: #222;
  font-size: 28px;
  font-weight: 700;
  letter-spacing: .5px;
}
.help-title--agreement {
  position: relative;
  justify-content: flex-start;
  min-height: 120px;
  padding: 0 48px;
  border: 0;
  overflow: hidden;
}
.help-title--agreement .en {
  position: absolute;
  left: 36px;
  top: 50%;
  transform: translateY(-52%);
  color: #ececec;
  font-size: 64px;
  font-weight: 800;
  letter-spacing: 1px;
  white-space: nowrap;
  pointer-events: none;
  user-select: none;
}
.help-title--agreement .zh {
  position: relative;
  z-index: 1;
  margin-left: 8px;
  color: #111;
  font-size: 34px;
  font-weight: 800;
}

.help-body {
  margin-top: 0;
  padding: 28px 40px 48px;
  background: #fff;
  color: #333;
  font-size: 15px;
  line-height: 1.9;
}
.help-body p { margin: 0 0 16px; }
.help-body b, .help-body strong { color: #111; font-weight: 700; }
.help-body a { color: #1a66ff; word-break: break-all; }
.help-body a:hover { text-decoration: underline; }
.help-body img {
  display: block;
  max-width: min(100%, 720px);
  height: auto;
  margin: 12px 0;
  border: 1px solid #eee;
  border-radius: 4px;
}
.help-body section.article h4 {
  margin: 28px 0 12px;
  font-size: 18px;
  color: #111;
}
.help-body section.article h4:first-child { margin-top: 0; }

.footer {
  margin-top: 0;
  width: 100%;
  background: #25284c;
  color: #5b5dae;
  font-size: 14px;
}
.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
  width: min(1200px, 100%);
  margin: 0 auto;
  padding: 28px 16px 36px;
}
.logo-footer img { width: 56px; height: auto; display: block; }
.guide {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 48px;
}
.guide a { color: #8a8ed0; }
.guide a:hover { color: #f8c21b; }
.desc p { margin: 0; text-align: center; color: #5b5dae; }

@media (max-width: 760px) {
  .help-topbar-inner { min-height: 72px; gap: 10px; padding: 0 10px; }
  .help-topbar .logo { width: 180px; }
  .help-topbar nav a { padding: 0 10px; font-size: 14px; }
  .help-title { min-height: 64px; font-size: 20px; }
  .help-title--agreement { min-height: 88px; padding: 0 16px; }
  .help-title--agreement .en { left: 12px; font-size: 34px; }
  .help-title--agreement .zh { font-size: 24px; }
  .help-body { padding: 18px 14px 28px; font-size: 14px; }
  .guide { gap: 18px 24px; }
}