:root {
  /* Font Sizes */
  --text-size-sm: 0.75rem;
  --text-size-md: 1rem;
  --text-size-lg: 1.25rem;

  /* Spacing & Layout */
  --space-vertical: 0.75rem 0;
  --letter-spacing: 0.0625rem;
  --border-radius: 0.3125rem;
  --img-radius: 10px;
  --header-height: 3.75rem;
  --blur-radius: 1.5625rem;

  /* Colors */
  --background: #f9fafb;
  --background-hover: #e5e7eb;
  --background-blur: rgba(249, 250, 251, 0.7);
  --text-color: #111827;
  --text-muted: #6b7280;
  --text-strong: #000000;
  --border-color: #d1d5db;
  --border-color-strong: #9ca3af;
  --link: #2563eb;
  --link-hover: #1d4ed8;
  --link-background: #bfdbfe;
  --scrollbar-thumb: #9ca3af;
  --scrollbar-track: #f9fafb;
  --hamburger-color: #27272a;
}/* Base Reset & Scrollbar */
* {
  box-sizing: border-box;
  padding: 0;
  margin: 0;
  scrollbar-width: thin;
  scrollbar-color: #9ca3af #f9fafb;
  scrollbar-color: var(--scrollbar-thumb) var(--scrollbar-track);
}

/* Layout Grid */
body,
#app {
  display: grid;
  grid-template-areas:
    'aside header header'
    'aside main main'
    'aside footer footer';
  grid-template-columns: 15rem 1fr 1fr;
  grid-template-rows: 3.75rem 1fr auto;
  grid-template-rows: var(--header-height) 1fr auto;
  font-size: 1rem;
  font-size: var(--text-size-md);
  background: #f9fafb;
  background: var(--background);
  color: #111827;
  color: var(--text-color);
}

/* Header */
header {
  grid-area: header;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  position: sticky;
  top: 0;
  padding: 0 1rem;
  border-bottom: 0.125rem solid #d1d5db;
  border-bottom: 0.125rem solid var(--border-color);
  z-index: 99;
  background: rgba(249, 250, 251, 0.7);
  background: var(--background-blur);
  backdrop-filter: blur(1.5625rem);
  backdrop-filter: blur(var(--blur-radius));
  -webkit-backdrop-filter: blur(1.5625rem);
  -webkit-backdrop-filter: blur(var(--blur-radius));
}

header #header-nav {
  font-weight: 600;
}

header #header-nav ul {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 0.9375rem;
}

/* Sidebar */
aside {
  grid-area: aside;
  padding: 1rem;
  text-align: center;
  border-right: 0.0625rem solid #d1d5db;
  border-right: 0.0625rem solid var(--border-color);
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  z-index: 100;
  transition:
    transform 0.3s ease, opacity 0.3s ease;
}

aside > *:not(:last-child) {
  margin-bottom: 1rem;
}

aside #aside-nav ul {
  list-style: none;
  padding: 0;
  text-align: left;
}

aside #aside-nav ul li {
  position: relative;
}

aside #aside-nav ul ul {
  padding-left: 1rem;
  border-left: 0.125rem solid #d1d5db;
  border-left: 0.125rem solid var(--border-color);
}

aside #aside-nav ul li a {
  display: block;
  width: 100%;
  padding: 0.5rem 0.35rem;
  border-radius: 0.3125rem;
  border-radius: var(--border-radius);
  transition: background-color 0.2s ease;
}

aside #aside-nav ul li a:hover {
  background-color: #e5e7eb;
  background-color: var(--background-hover);
}

aside #aside-nav ul ul li a:hover {
  background-color: #e5e7eb;
  background-color: var(--background-hover);
}

/* search-aside */
#search-aside {
  display: block;
  width: 100%;
  padding: 0.5rem 1rem;
  font-size: 1rem;
  font-size: var(--text-size-md);
  color: #111827;
  color: var(--text-color);
  background-color: #f9fafb;
  background-color: var(--background);
  border: 1px solid #d1d5db;
  border: 1px solid var(--border-color);
  border-radius: 0.3125rem;
  border-radius: var(--border-radius);
  transition: all 0.3s ease;
}

#search-aside:focus {
  outline: none;
  border-color: #2563eb;
  border-color: var(--link);
  box-shadow: 0 0 0.25rem #bfdbfe;
  box-shadow: 0 0 0.25rem var(--link-background);
}

#search-aside::-moz-placeholder {
  color: #6b7280;
  color: var(--text-muted);
  opacity: 1;
}

#search-aside::placeholder {
  color: #6b7280;
  color: var(--text-muted);
  opacity: 1;
}

input#search-aside:-webkit-autofill,
input#search-aside:-webkit-autofill:hover,
input#search-aside:-webkit-autofill:focus,
input#search-aside:-internal-autofill-selected {
  background-color: #f9fafb !important;
  background-color: var(--background) !important;
  -webkit-box-shadow: 0 0 0px 1000px #f9fafb inset !important;
  -webkit-box-shadow: 0 0 0px 1000px var(--background) inset !important;
  color: #111827 !important;
  color: var(--text-color) !important;
}

/* Main */
main {
  grid-area: main;
}

#md {
  max-width: 100%;
  padding: 1rem;
  word-wrap: break-word;
  word-break: break-word;
  font-size: 1rem;
  line-height: 1.6;
}

#md > * {
  margin-bottom: 0.75rem;
  padding: 0 0.5rem;
}

#md > *:first-child {
  padding: 0.75rem 0.5rem;
  border-bottom: 0.125rem solid #d1d5db;
  border-bottom: 0.125rem solid var(--border-color);
}

#md ul,
#md ol {
  margin-left: 1rem;
}

#md li {
  margin: 0.75rem 0 0 1rem;
}

/* Headings */
#md h1,
#md h2,
#md h3,
#md h4,
#md h5,
#md h6 {
  font-weight: 600;
  letter-spacing: 0.0625rem;
  letter-spacing: var(--letter-spacing);
  margin: 1rem 0 0.5rem;
  line-height: 1.4;
}

#md h1 {
  font-size: 2rem;
}
#md h2 {
  font-size: 1.75rem;
}
#md h3 {
  font-size: 1.5rem;
}
#md h4 {
  font-size: 1.25rem;
}
#md h5 {
  font-size: 1.1rem;
}
#md h6 {
  font-size: 1rem;
}

/* Paragraph */
#md p {
  line-height: 1.6;
  margin-bottom: 1rem;
}

/* Blockquote */
#md blockquote {
  margin: 1rem 0;
  padding: 0.75rem 1rem;
  border-left: 0.25rem solid #d1d5db;
  border-left: 0.25rem solid var(--border-color);
  background: rgba(255, 255, 255, 0.03);
  color: #6b7280;
  color: var(--text-muted);
  font-style: italic;
}

/* Code */
#md code {
  background: rgba(255, 255, 255, 0.05);
  padding: 0.2rem 0.4rem;
  border-radius: 4px;
  font-family: 'Courier New', monospace;
  font-size: 0.95em;
  word-break: break-word;
}

#md pre {
  position: relative;
  background: #1e1e20;
  color: #f4f4f5;
  overflow-x: auto;
  padding: 1rem;
  border-radius: 0.3125rem;
  border-radius: var(--border-radius);
  font-size: 0.9rem;
  line-height: 1.5;
  font-family: 'Courier New', monospace;
  white-space: pre;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

#md pre code {
  padding: 0;
  background: none;
  color: inherit;
}

/* Tables */
#md table {
  display: block;
  width: 100%;
  overflow-x: auto;
  border-collapse: collapse;
  -webkit-overflow-scrolling: touch;
  margin-bottom: 1rem;
  font-size: 0.95rem;
  border: 1px solid #d1d5db;
  border: 1px solid var(--border-color);
  border-radius: 0.3125rem;
  border-radius: var(--border-radius);
}

#md table th,
#md table td {
  border: 1px solid #d1d5db;
  border: 1px solid var(--border-color);
  padding: 0.5rem 0.75rem;
  text-align: left;
}

#md table th {
  color: #000000;
  color: var(--text-strong);
}

#md table td {
  background-color: #f9fafb;
  background-color: var(--background);
  color: #111827;
  color: var(--text-color);
}

#md table::before {
  content: 'Swipe → to scroll';
  display: block;
  font-size: 0.75rem;
  color: #6b7280;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
}

/* Task lists */
#md input[type='checkbox'] {
  margin-right: 0.5rem;
  accent-color: #2563eb;
  accent-color: var(--link);
}

#md kbd {
  background: #1e293b;
  color: #000000;
  color: var(--text-strong);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  font-size: 0.85em;
  font-family: monospace;
  border: 1px solid #d1d5db;
  border: 1px solid var(--border-color);
}

#md dl {
  margin: 1rem 0;
}
#md dt {
  font-weight: bold;
}
#md dd {
  margin-left: 1rem;
  margin-bottom: 0.5rem;
}

/* Links */
a {
  color: #2563eb;
  color: var(--link);
  -webkit-text-decoration: none;
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: #1d4ed8;
  color: var(--link-hover);
  -webkit-text-decoration: underline;
  text-decoration: underline;
}

a:not(#md a):not(footer a):not(#page-actions a) {
  -webkit-text-decoration: none;
  text-decoration: none;
  color: inherit;
}

/* HR */
#md > hr {
  width: 50%;
  border: 0.0625rem solid #d1d5db;
  border: 0.0625rem solid var(--border-color);
  border-radius: 0.3125rem;
  border-radius: var(--border-radius);
  justify-self: center;
  margin: 2rem auto;
}

/* img */
#md img {
  display: block;
  width: 100%;
  max-height: 80vh;
  aspect-ratio: 16 / 9;
  -o-object-fit: cover;
     object-fit: cover;
  border-radius: 10px;
  border-radius: var(--img-radius);
  margin: 0.75rem 0;
  transition: transform 0.3s ease;
  cursor: zoom-in;
}

#md img:hover {
  transform: scale(1.02);
}

/* Footer */
footer {
  grid-area: footer;
  padding: 0.5rem 1rem;
  text-align: center;
  border-top: 0.125rem solid #d1d5db;
  border-top: 0.125rem solid var(--border-color);
}

/* Page Actions */
#page-actions {
  padding: 0.5rem;
  max-height: -moz-fit-content;
  max-height: fit-content;
}

/* Toggle Button */
#toggle-aside {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 1.5rem;
  height: 1.125rem;
  background: none;
  border: none;
  cursor: pointer;
  margin-right: auto;
  padding: 0;
}

#toggle-aside span {
  display: block;
  margin: auto;
  width: 100%;
  height: 0.1875rem;
  background-color: #27272a;
  background-color: var(--hamburger-color);
  border-radius: 0.125rem;
  transition: all 0.3s ease;
  transform-origin: center;
}

#toggle-aside.open span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

#toggle-aside.open span:nth-child(2) {
  opacity: 0;
}

#toggle-aside.open span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* Responsive Layout */
@media (max-width: 810px) {
  body,
  #app {
    grid-template-areas:
      'header'
      'main'
      'footer';
    grid-template-columns: 1fr;
    grid-template-rows: 3.75rem 1fr auto;
    grid-template-rows: var(--header-height) 1fr auto;
  }

  #toggle-aside {
    display: flex;
  }

  aside {
    position: fixed;
    top: 3.75rem;
    top: var(--header-height);
    left: 0;
    width: 70%;
    height: 100%;
    background: rgba(249, 250, 251, 0.7);
    background: var(--background-blur);
    backdrop-filter: blur(1.5625rem);
    backdrop-filter: blur(var(--blur-radius));
    -webkit-backdrop-filter: blur(1.5625rem);
    -webkit-backdrop-filter: blur(var(--blur-radius));
    border-right: 0.0625rem solid #d1d5db;
    border-right: 0.0625rem solid var(--border-color);
    transform: translateX(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
  }

  aside.active-aside {
    transform: translateX(0);
    opacity: 1;
    visibility: visible;
  }

  #md h1 {
    font-size: 1.5rem;
  }
  #md h2 {
    font-size: 1.25rem;
  }
  #md h3 {
    font-size: 1.1rem;
  }
  #md h4,
  #md h5,
  #md h6 {
    font-size: 1rem;
  }

  #md {
    padding: 0.75rem;
    font-size: 0.95rem;
  }

  #md table th,
  #md table td {
    padding: 0.5rem;
    font-size: 0.875rem;
  }

  #md pre {
    font-size: 0.875rem;
  }
}