:root {
  /* Nord Snow Storm (Light Theme) */
  --nord0: #2e3440;
  --nord1: #3b4252;
  --nord2: #434c5e;
  --nord3: #4c566a;
  --nord4: #d8dee9;
  --nord5: #e5e9f0;
  --nord6: #eceff4;
  --nord7: #8fbcbb;
  --nord8: #88c0d0;
  --nord9: #81a1c1;
  --nord10: #5e81ac;
  --nord11: #bf616a;
  --nord12: #d08770;
  --nord13: #ebcb8b;
  --nord14: #a3be8c;
  --nord15: #b48ead;

  /* Theme Mapping */
  --base3: var(--nord6);
  /* Background */
  --base2: var(--nord5);
  /* Highlights */
  --base1: var(--nord4);
  /* Borders */
  --base0: var(--nord3);
  --base00: var(--nord1);
  /* Main Text */
  --base01: var(--nord2);
  /* Secondary Text */
  --base02: var(--nord0);
  /* Headings */
  --base03: var(--nord0);

  --yellow: var(--nord13);
  --orange: var(--nord12);
  --red: var(--nord11);
  --magenta: var(--nord15);
  --violet: var(--nord15);
  --blue: var(--nord10);
  /* Links */
  --cyan: var(--nord8);
  --green: var(--nord14);
}

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 SC', 'SimSun', serif;
  font-weight: 300;
  background-color: var(--base3);
  color: var(--base00);
  font-size: 1.25rem;
  /* Increased size */
  line-height: 1.6;
}

a {
  color: var(--nord10);
  text-decoration: none;
  transition: color 0.2s ease-in-out;
}

a:hover {
  color: var(--nord8);
  text-decoration: underline;
}

a:visited {
  color: var(--nord9);
}

/* ... headers ... */

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

.heti {
  font-family: 'Crimson Pro', 'I.Ming', 'I.MingCP', 'HanaMinA', 'Songti SC', 'Noto Serif SC', 'SimSun', serif !important;
  font-weight: 300 !important;
}

.heti h1,
.heti h2,
.heti h3,
.heti h4,
.heti h5,
.heti h6 {
  font-family: 'Crimson Pro', 'Chill Round', 'HanChanTuanYuan', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif !important;
  font-weight: 400 !important;
}

/* Maintain custom bullet but within Heti */
.heti ul {
  list-style: none !important;
  padding-left: 0 !important;
}

.heti ul li {
  position: relative !important;
  padding-left: 1.2rem !important;
}

.heti ul li::before {
  content: "\25aa" !important;
  position: absolute !important;
  left: 0 !important;
  color: var(--nord8) !important;
  font-size: 0.6em !important;
  top: 0.4em !important;
}

/* Ensure headings don't get too wide but are larger */
h1,
h2,
h3,
h4,
h5,
h6 {
  color: var(--base02);
  font-family: 'Crimson Pro', 'Chill Round', 'HanChanTuanYuan', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 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: 'JetBrains Mono', monospace;
  font-size: 0.9em;
  background-color: var(--base2);
  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(--base1);
  padding: 1rem 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

header h1 {
  margin: 0;
  font-size: 1.5rem;
  color: var(--base02);
  font-weight: 400;
}

header nav a {
  text-decoration: none;
  color: var(--base01);
  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(--base01);
  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(--base1);
  color: var(--base01);
  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(--base3);
  padding: 0.5rem;
  border-left: 2px solid var(--base2);
  color: var(--base01);
  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(--blue);
  font-weight: bold;
}

.sidenote-number-link {
  color: var(--blue);
  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(--base3);
  }
}

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