@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:ital,wght@0,300;0,400;0,500;1,300&family=IBM+Plex+Serif:ital,wght@0,300;0,400;1,300&display=swap');

:root {
  --bg:         #18191b;
  --bg-raised:  #1e1f22;
  --bg-code:    #141517;
  --border:     #272829;
  --text:       #9aa3ad;
  --text-dim:   #4e5560;
  --text-muted: #30333a;
  --accent:     #6e8fa0;
  --accent-dim: #3d5b6b;
  --white:      #c8d4dc;
}

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

::selection {
  background: var(--accent-dim);
  color: var(--white);
}

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--bg);
  color: var(--text);
  font-family: 'IBM Plex Serif', Georgia, serif;
  font-size: 0.82rem;
  font-weight: 300;
  max-width: 680px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 3rem;
  line-height: 1.75;
  letter-spacing: 0.015em;
}

.rattip-nav {
  display: flex;
  gap: 2rem;
  padding-bottom: 1rem;
  margin-bottom: 1.8rem;
  border-bottom: 1px solid var(--border);
}

.rattip-nav-a {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  text-decoration: none;
  border-bottom: none;
  transition: color 0.15s;
}

.rattip-nav-a:hover,
.rattip-nav-a.active {
  color: var(--accent);
}

.rattip-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding-bottom: 1rem;
  margin-bottom: 1.8rem;
  border-bottom: 1px solid var(--border);
}

.rattip-date {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.68rem;
  color: var(--text-muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.rattip-footer {
  margin-top: 3rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.65rem;
  color: var(--text-muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-align: center;
}

.rattip-h1,
.rattip-h2,
.rattip-h3,
.rattip-h4,
.rattip-h5,
.rattip-h6 {
  scroll-margin-top: 1rem;
}

.rattip-h1 {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 1.5rem;
  font-weight: 500;
  color: var(--white);
  line-height: 1.2;
  margin: 1.2rem 0 0.5rem;
  letter-spacing: -0.01em;
}

.rattip-h1::after {
  content: '_';
  color: var(--accent);
  animation: blink 1.2s step-end infinite;
  margin-left: 2px;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0; }
}

.rattip-h2 {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.78rem;
  font-weight: 400;
  color: var(--accent);
  margin: 1.6rem 0 0.55rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  position: relative;
}

.rattip-h3 {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.74rem;
  font-weight: 400;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  margin: 1.1rem 0 0.35rem;
}

.rattip-h3 .rattip-a {
  border-bottom: none;
  color: var(--white);
}

.rattip-h3 .rattip-a:hover {
  color: var(--accent);
}

.rattip-h4 {
  font-family: 'IBM Plex Serif', serif;
  font-size: 1rem;
  font-weight: 400;
  font-style: italic;
  color: var(--white);
  line-height: 1.4;
  margin: 1rem 0 0.3rem;
  letter-spacing: 0.01em;
}

.rattip-h5 {
  font-family: 'IBM Plex Serif', serif;
  font-size: 0.9rem;
  font-weight: 400;
  color: var(--text);
  line-height: 1.45;
  margin: 0.85rem 0 0.25rem;
  letter-spacing: 0.01em;
}

.rattip-h6 {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.66rem;
  font-weight: 400;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  margin: 0.8rem 0 0.2rem;
}

.rattip-p + .rattip-h2,
.rattip-ul + .rattip-h2,
.rattip-ol + .rattip-h2,
.rattip-pre + .rattip-h2,
.rattip-blockquote + .rattip-h2,
.rattip-table + .rattip-h2 {
  margin-top: 1.8rem;
}

.rattip-p + .rattip-h3,
.rattip-ul + .rattip-h3,
.rattip-ol + .rattip-h3,
.rattip-pre + .rattip-h3,
.rattip-blockquote + .rattip-h3,
.rattip-table + .rattip-h3 {
  margin-top: 1.2rem;
}

.rattip-p {
  margin: 0.5rem 0;
}

.rattip-a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid var(--accent-dim);
  transition: color 0.15s, border-color 0.15s;
}

.rattip-a:hover {
  color: var(--white);
  border-bottom-color: var(--white);
}

.rattip-ul {
  margin: 0.5rem 0;
  padding-left: 0;
  list-style: none;
}

.rattip-ol {
  margin: 0.5rem 0 0.5rem 1.5rem;
}

.rattip-ul .rattip-li {
  padding-left: 1.3rem;
  position: relative;
  margin: 0.2rem 0;
}

.rattip-ul .rattip-li::before {
  content: '›';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-family: 'IBM Plex Mono', monospace;
}

.rattip-ol .rattip-li {
  margin: 0.2rem 0;
}

.rattip-li input[type="checkbox"] {
  margin-right: 0.5rem;
  accent-color: var(--accent);
}

.rattip-code {
  display: inline-block;
  vertical-align: middle;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.75em;
  background-color: var(--bg-code);
  color: var(--accent);
  padding: 0.1rem 0.3rem;
  border-radius: 3px;
  border: 1.5px solid var(--border);
  line-height: 1.4;
  white-space: nowrap;
}

.rattip-pre {
  background-color: var(--bg-code);
  border: 1px solid var(--border);
  border-left: 2px solid var(--accent-dim);
  padding: 0.8rem 1rem;
  border-radius: 3px;
  overflow-x: auto;
  margin: 0.75rem 0;
  width: 100%;
}

.rattip-pre .rattip-code {
  background: none;
  border: none;
  padding: 0;
  color: var(--text);
  font-size: 0.78em;
  line-height: 1.65;
  white-space: pre;
  display: block;
}

.rattip-blockquote {
  margin: 0.5rem 0;
  padding: 0.5rem 1rem;
  background: var(--bg-raised);
  border-left: 2px solid var(--accent-dim);
  color: var(--text-dim);
  font-style: italic;
  font-size: 0.88em;
  line-height: 1.6;
  display: flow-root;
}

.rattip-blockquote .rattip-p {
  margin: 0;
}
.rattip-blockquote .rattip-p + .rattip-p {
  margin-top: 0.4rem;
}

.rattip-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  font-size: 0.75rem;
  font-family: 'IBM Plex Mono', monospace;
}

.rattip-thead {
  border-bottom: 1px solid var(--accent-dim);
}

.rattip-th {
  font-size: 0.63rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent);
  padding: 0.5rem 0.8rem;
  text-align: left;
  font-weight: 400;
}

.rattip-td {
  padding: 0.45rem 0.8rem;
  border-bottom: 1px solid var(--border);
  color: var(--text);
}

.rattip-tr:hover .rattip-td {
  background-color: var(--bg-raised);
}

.rattip-b {
  font-weight: 500;
  color: var(--white);
}

.rattip-i {
  font-style: italic;
  color: var(--text-dim);
}

.rattip-del {
  text-decoration: line-through;
  color: var(--text-muted);
}

.rattip-u {
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: var(--accent-dim);
}

.rattip-sup,
.rattip-sub {
  font-size: 0.62em;
  font-family: 'IBM Plex Mono', monospace;
  color: var(--accent);
}

.rattip-hr {
  border: none;
  height: 1px;
  background: var(--border);
  margin: 0.6rem 0;
}

.rattip-img {
  max-width: 100%;
  border-radius: 2px;
  margin: 1rem 0;
  border: 1px solid var(--border);
  display: block;
}

.rattip-spoiler {
  background-color: var(--bg-raised);
  border-radius: 2px;
  border: 1px solid var(--border);
  padding: 0.1rem 0.35rem;
  color: var(--text-muted);
  cursor: default;
}

.rattip-back-container {
  position: fixed;
  top: 1.5rem;
  left: 1.5rem;
  z-index: 100;
}

.rattip-back-btn {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--text-muted);
  text-decoration: none;
  border: 1px solid var(--border);
  padding: 0.4rem 0.6rem;
  border-radius: 2px;
  background: var(--bg);
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
}

.rattip-back-dir {
  color: var(--accent-dim);
  margin-right: 2px;
}

.rattip-back-btn:hover {
  color: var(--white);
  border-color: var(--accent-dim);
  background: var(--bg-raised);
  transform: translateX(-3px);
}

@media (max-width: 900px) {
  .rattip-back-container {
    position: relative;
    top: 0;
    left: 0;
    margin-bottom: 1rem;
  }
}

::-webkit-scrollbar         { width: 4px; height: 4px; }
::-webkit-scrollbar-track   { background: var(--bg); }
::-webkit-scrollbar-thumb   { background: var(--border); border-radius: 2px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }