:root {
  --moegi: #A7C957;
  --sumi: #1C1C1C;
  --kinari: #F8F4E9;
  --matcha: #A7B86B;
  --Kinari: #F3EBDA;
  --cha: #6C5A3C;
}

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  grid-template-rows: auto 1fr auto;
  grid-template-columns: 100%;
  font-family: 'Crimson Pro', 'I.Ming', 'I.MingCP', 'HanaMinA', 'Songti SC', 'Noto Serif CJK SC', 'SimSun', serif;
  font-weight: 300;
  background-color: var(--kinari);
  color: var(--sumi);
  font-size: 1.25rem;
  /* Increased size */
  line-height: 1.6;
}

a {
  color: var(--cha);
  background-color: var(--kinari);
  text-decoration: none;
  transition: color 0.2s ease-in-out;
}

a:hover {
  color: var(--sumi);
  background-color: var(--moegi);
  text-decoration: underline;
}

a:visited {
  color: var(--cha);
  background-color: var(--Kinari);
}

/* ... headers ... */

main p,
main li {
  max-width: 50ch;
  /* Enforce ~10-12 words per line */
}

/* Ensure headings don't get too wide but are larger */
h1,
h2,
h3,
h4,
h5,
h6 {
  color: var(--sumi);
  font-family: 'Crimson Pro', 'Chill Round', 'HanChanTuanYuan', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Noto Sans CJK SC', sans-serif;
  font-weight: 400;
  max-width: 40ch;
  line-height: 1.2;
}

h1 {
  font-size: 2.5rem;
}

h2 {
  font-size: 2rem;
}

h3 {
  font-size: 1.75rem;
}

code,
pre {
  font-family: 'IBM Plex Mono Medium', 'JetBrains Mono', monospace;
  font-size: 0.9em;
  background-color: var(--Kinari);
  padding: 0.2rem 0.4rem;
  border-radius: 4px;
}

pre {
  padding: 1rem;
  overflow-x: auto;
}

pre code {
  padding: 0;
  background-color: transparent;
}

/* Mobile Layout (default) */
.layout-container {
  display: grid;
  grid-template-areas:
    "header"
    "main"
    "aside"
    "footer";
  column-gap: 3rem;
  row-gap: 1rem;
  padding: 0;
  max-width: 900px;
  /* Reduced from 1080px */
  margin: 0 auto;
  width: 100%;
  box-sizing: border-box;
}

/* Desktop Layout */
@media (min-width: 768px) {
  .layout-container {
    grid-template-areas:
      "header header"
      "main aside"
      "footer footer";
    grid-template-columns: 3fr 1fr;
  }
}

header {
  grid-area: header;
  border-bottom: 1px solid var(--cha);
  padding: 1rem 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

header h1 {
  margin: 0;
  font-size: 1.5rem;
  color: var(--sumi);
  font-weight: 400;
}

header nav a {
  text-decoration: none;
  color: var(--sumi);
  font-weight: bold;
}

main {
  grid-area: main;
  position: relative;
  /* For sidenote positioning context if needed */
  padding: 2rem;
  min-width: 0;
  /* Prevent grid blowout */
}

aside {
  grid-area: aside;
  /* background: #f9f9f9; removed */
  padding: 1rem 0;
  color: var(--sumi);
  font-size: 1rem;
  line-height: 1.4;
  position: relative;
  /* For absolute positioning of sidenotes */
  min-width: 0;
  /* Prevent grid blowout */
  overflow-wrap: anywhere;
  /* Prevent long URLs from breaking layout */
}

img,
svg {
  max-width: 100%;
  height: auto;
}

footer {
  grid-area: footer;
  border-top: 1px solid var(--cha);
  color: var(--sumi);
  padding: 1rem 0;
  text-align: right;
  margin-top: 2rem;
}

/* Sidenotes (Moved to Aside) */
.sidenote {
  position: absolute;
  width: 100%;
  left: 0;
  margin: 0;
  font-size: 0.85rem;
  line-height: 1.3;
  background: var(--Kinari);
  padding: 0.5rem;
  border-left: 2px solid var(--cha);
  color: var(--sumi);
  overflow-wrap: break-word;
  hyphens: auto;
  box-sizing: border-box;
  transition: top 0.3s ease;
}

/* Sidenote Number */
.sidenote-number {
  counter-increment: sidenote-counter;
}

.sidenote-number:after {
  content: counter(sidenote-counter);
  font-family: system-ui, sans-serif;
  vertical-align: super;
  font-size: 0.7em;
  color: var(--matcha);
  font-weight: bold;
}

.sidenote-number-link {
  color: var(--matcha);
  font-weight: bold;
}

/* Checkbox toggle for mobile (optional, hiding for now on desktop) */
.margin-toggle {
  display: none;
}

@keyframes highlight-fade {
  0% {
    background-color: #ffffff;
  }

  100% {
    background-color: var(--cha);
  }
}

.sidenote-highlight {
  animation: highlight-fade 3s forwards;
}