/* Reset */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Songti SC", "STSong", "华文宋体", "PT Serif", "Source Han Serif SC", "Noto Serif SC", "Noto Serif CJK SC", "SimSun", "宋体", "Times New Roman", Times, serif;
  background-color: #f4f1ea; /* Old paper color */
  color: #2c2c2c;
  line-height: 1.6;
  font-size: 18px;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* Noise Texture */
.noise-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 9999;
  opacity: 0.08;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
}

.container {
  max-width: 700px;
  margin: 0 auto;
  padding: 0 20px;
  position: relative;
  z-index: 1;
}

/* Cover */
.cover {
  height: 90vh;
  display: flex;
  flex-direction: row; /* Standard row */
  align-items: center; /* Vertical center */
  justify-content: flex-end; /* Right align */
  padding-right: 10vw; /* Spacing from right edge */
  position: relative;
  border-bottom: 1px solid rgba(0,0,0,0.1);
  margin-bottom: 60px;
}

.site-title {
  font-size: 4rem;
  font-weight: normal;
  letter-spacing: 0.4em;
  margin-right: 0;
  text-shadow: 1px 1px 2px rgba(0,0,0,0.1);
  writing-mode: vertical-rl;
  text-orientation: upright;
}

/* TOC */
.toc {
  margin-bottom: 100px;
  padding: 40px;
  background-color: rgba(255,255,255,0.4);
  border: 1px solid rgba(0,0,0,0.05);
  box-shadow: 2px 2px 10px rgba(0,0,0,0.02);
}

.toc h2 {
  text-align: center;
  margin-bottom: 60px;
  font-weight: normal;
  letter-spacing: 0.1em;
}

.toc ul {
  list-style: none;
  column-count: 3;
  column-gap: 60px;
}

.toc li {
  margin-bottom: 10px;
}

.toc a {
  text-decoration: none;
  color: #444;
  border-bottom: 1px dotted #aaa;
  transition: color 0.2s;
}

.toc a:hover {
  color: #000;
  border-bottom-style: solid;
}

/* Poem */
.poem {
  margin-bottom: 120px;
  padding-top: 40px; /* For anchor offset if needed, though margin works */
  page-break-inside: avoid;
}

.poem-header {
  margin-bottom: 30px;
  text-align: left;
  padding: 0 20px;
}

.poem-title {
  font-size: 2rem;
  font-weight: normal;
  letter-spacing: 0.1em;
}

.poem-content {
  white-space: pre-wrap; /* Preserve whitespace and line breaks */
  font-size: 1.1rem;
  line-height: 2;
  margin-bottom: 30px;
  padding: 0 20px;
  /* Sometimes poems are centered, but usually left aligned looks better for verses unless they are concrete poetry */
  /* Given the text file has no specific indentation for centering, left is safer. */
  /* However, for a "book" feel, sometimes a slight padding-left is nice. */
}

.poem-footer {
  text-align: left;
  margin-top: 20px;
  font-style: italic;
  color: #777;
  font-size: 0.9rem;
  padding: 0 20px;
}

/* Back to TOC */
.back-to-toc {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 40px;
  height: 40px;
  background: rgba(0,0,0,0.1);
  color: #444;
  text-decoration: none;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  transition: background 0.3s, color 0.3s;
  z-index: 100;
}

.back-to-toc:hover {
  background: rgba(0,0,0,0.3);
  color: #fff;
}

/* Mobile */
@media (max-width: 600px) {
  .site-title {
    font-size: 2.5rem;
  }
  
  .toc ul {
    column-count: 1;
  }
  
  .site-title {
    font-size: 3rem;
    margin-right: 0;
  }
  
  .poem-content {
    font-size: 1rem;
    /* Keep padding consistent with header */
  }
  
  .container {
    padding: 0 30px;
  }
}