:root {
  --bg: #fff;
  --text: #171717;
  --muted: #686868;
  --line: #e6e6e6;
  --link: #0b5c85;
  --sans: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  letter-spacing: 0;
}

.page {
  width: min(100% - 40px, 620px);
  margin: 0 auto;
  padding: 96px 0;
}

.profile {
  display: flex;
  align-items: center;
  gap: 18px;
}

.avatar {
  display: block;
  flex: 0 0 auto;
  width: 72px;
  height: 72px;
  border-radius: 50%;
  object-fit: cover;
  object-position: 50% 34%;
}

h1 {
  margin: 0;
  font-size: 36px;
  font-weight: 650;
  line-height: 1.15;
}

.intro {
  max-width: 560px;
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.75;
}

.intro p {
  margin: 0;
}

.intro p + p {
  margin-top: 4px;
}

.primary-links {
  display: flex;
  gap: 18px;
  margin-top: 28px;
  font-size: 16px;
}

.primary-links a {
  color: var(--link);
  text-decoration: none;
  text-underline-offset: 3px;
}

.primary-links a:hover {
  text-decoration: underline;
}

.social-links {
  display: flex;
  gap: 14px;
  margin-top: 34px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}

.social-links a,
.social-links .qr-link {
  position: relative;
  display: inline-flex;
  width: 28px;
  height: 28px;
  align-items: center;
  justify-content: center;
  color: var(--muted);
  cursor: pointer;
  transition: color 150ms ease, transform 150ms ease;
}

.social-links a:hover,
.social-links .qr-link:hover {
  color: var(--text);
  transform: translateY(-1px);
}

svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
}

.qr-card {
  pointer-events: none;
  position: absolute;
  left: 50%;
  bottom: calc(100% + 14px);
  display: grid;
  gap: 8px;
  width: 160px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  color: var(--text);
  box-shadow: 0 12px 34px rgba(0, 0, 0, 0.1);
  opacity: 0;
  transform: translate(-50%, 6px);
  transition: opacity 150ms ease, transform 150ms ease;
}

.qr-card::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -6px;
  width: 10px;
  height: 10px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: #fff;
  transform: translateX(-50%) rotate(45deg);
}

.qr-link:hover .qr-card {
  opacity: 1;
  transform: translate(-50%, 0);
}

.qr-title,
.qr-note {
  display: block;
  text-align: center;
  font-size: 12px;
  line-height: 1.3;
}

.qr-title {
  color: var(--text);
  font-weight: 600;
}

.qr-note {
  color: var(--muted);
}

.qr-box {
  display: block;
  width: 136px;
  height: 136px;
  border-radius: 6px;
  background: #f7f7f7;
  overflow: hidden;
}

.qr-box img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

@media (max-width: 560px) {
  .page {
    width: min(100% - 32px, 620px);
    padding: 64px 0;
  }

  .avatar {
    width: 64px;
    height: 64px;
  }

  h1 {
    font-size: 32px;
  }
}