:root {
  --paper: #f6f1e7;
  --ink: #292722;
  --muted: #887f72;
  --vermilion: #a13d32;
  --line: rgba(161, 61, 50, 0.28);
}

* {
  box-sizing: border-box;
}

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

body {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  margin: 0;
  padding: 72px 24px 96px;
  overflow: hidden;
  background: var(--paper);
  color: var(--ink);
  font-family: "Noto Serif SC", "Songti SC", "STSong", "SimSun", serif;
}

.poem-card {
  position: relative;
  z-index: 1;
  width: min(900px, 100%);
  padding: clamp(48px, 9vw, 96px) clamp(28px, 8vw, 100px);
  border: 1px solid var(--line);
  background: #fbf8f1;
  box-shadow: 0 18px 60px rgba(70, 53, 36, 0.08);
  text-align: center;
}

.poem-card::before,
.poem-card::after {
  position: absolute;
  width: 12px;
  height: 12px;
  border-color: var(--vermilion);
  content: "";
}

.poem-card::before {
  top: 14px;
  left: 14px;
  border-top: 1px solid;
  border-left: 1px solid;
}

.poem-card::after {
  right: 14px;
  bottom: 14px;
  border-right: 1px solid;
  border-bottom: 1px solid;
}

#poem_sentence {
  margin: 0;
  color: var(--ink);
  font-size: clamp(30px, 5vw, 58px);
  font-family: "STXingkai", "Xingkai", "华文行楷", "STKaiti", "KaiTi", "楷体", "DFKai-SB", "FZKai-Z03", serif;
  font-weight: normal;
  letter-spacing: 0.16em;
  line-height: 1.8;
  white-space: pre-line;
}

#poem_info {
  margin-top: 30px;
  color: var(--muted);
  font-size: clamp(14px, 2vw, 17px);
  letter-spacing: 0.12em;
}

#poem_info::before {
  display: block;
  width: 42px;
  height: 1px;
  margin: 0 auto 18px;
  background: var(--vermilion);
  content: "";
}

footer {
  position: fixed;
  right: 0;
  bottom: 0;
  left: 0;
  z-index: 2;
  padding: 18px 24px 22px;
  color: var(--muted);
  font-family: system-ui, -apple-system, "Microsoft YaHei", sans-serif;
  font-size: 12px;
  letter-spacing: 0.12em;
  text-align: center;
}

footer p {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0;
}

.github-link {
  display: inline-flex;
  color: var(--muted);
  transition: color 160ms ease;
}

.github-link:hover {
  color: var(--vermilion);
}

.github-link svg {
  width: 17px;
  height: 17px;
  fill: currentColor;
}

@media (max-width: 600px) {
  body {
    padding: 40px 16px 72px;
  }

  .poem-card {
    padding: 48px 20px;
  }

  #poem_sentence {
    letter-spacing: 0.08em;
  }

  #poem_info {
    letter-spacing: 0.04em;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    scroll-behavior: auto !important;
  }
}