:root {
  --paper: #f2f4f1;
  --pane: #fdfdfb;
  --ink: #21272c;
  --ink-soft: #5c666d;
  --rule: #d8ddd6;
  --accent: #2c5fad;
  --accent-warm: #a97b12;
  --green: #4f7d5a;
  --green-light: #dcead8;
  --spine: #e9ece6;
  --modeline: #eef0ea;
  --text: 18px;
  --pane-width: clamp(520px, 33.3vw, 760px);
  --spine-width: 42px;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: "Departure Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}

@font-face {
  font-family: "Departure Mono";
  src: url("static/fonts/DepartureMono-Regular.woff2") format("woff2");
  font-weight: 400;
  font-display: swap;
}

* { box-sizing: border-box; }

::selection { background: var(--green-light); }

html, body {
  margin: 0;
  height: 100%;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  -webkit-text-size-adjust: 100%;
}

body { display: flex; flex-direction: column; }

.site-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 14px 22px;
  border-bottom: 1px solid var(--rule);
  font-family: var(--mono);
  font-size: 13px;
}

.site-title { color: var(--ink); text-decoration: none; font-weight: 600; letter-spacing: 0.02em; }
.site-title:hover { color: var(--accent); }
.site-nav a { color: var(--ink-soft); text-decoration: none; margin-left: 18px; }
.site-nav a:hover { color: var(--accent); }

.site-search { position: relative; flex: 1; max-width: 340px; margin: 0 22px; }

#search {
  width: 100%;
  padding: 4px 8px;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--ink);
  background: var(--pane);
  border: 1px solid var(--rule);
  border-radius: 3px;
  outline: none;
}
#search:focus { border-color: var(--accent); }
#search::placeholder { color: var(--ink-soft); }

#search-results {
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  right: 0;
  z-index: 200;
  background: var(--pane);
  border: 1px solid var(--rule);
  border-radius: 3px;
  box-shadow: 0 4px 14px rgba(33, 39, 44, 0.12);
  max-height: 60vh;
  overflow-y: auto;
}

.search-hit {
  display: block;
  padding: 8px 10px;
  text-decoration: none;
  border-bottom: 1px solid var(--rule);
}
.search-hit:last-child { border-bottom: none; }
.search-hit:hover, .search-hit.active { background: var(--green-light); }
.search-hit-title { display: block; color: var(--accent-warm); font-size: 13px; }
.search-hit-snippet {
  display: block;
  margin-top: 2px;
  color: var(--ink-soft);
  font-family: var(--sans);
  font-size: 12px;
  line-height: 1.4;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.tag-cloud { line-height: 2.1; }
.tag-cloud .tag-link { margin-right: 10px; }

#trail { display: none; }

#panes {
  flex: 1;
  display: flex;
  overflow-x: auto;
  overflow-y: hidden;
  scroll-behavior: smooth;
}

.pane {
  position: sticky;
  flex: 0 0 var(--pane-width);
  width: var(--pane-width);
  max-width: 92vw;
  height: 100%;
  display: flex;
  flex-direction: column;
  background: var(--pane);
  border-right: 1px solid var(--rule);
  box-shadow: -3px 0 8px rgba(33, 39, 44, 0.06);
}

.pane-spine {
  position: absolute;
  inset: 0 auto 0 0;
  width: var(--spine-width);
  padding-top: 20px;
  background: var(--spine);
  border-right: 1px solid var(--rule);
  writing-mode: vertical-rl;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--ink-soft);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  cursor: pointer;
  user-select: none;
}

.pane-spine:hover { color: var(--ink); background: var(--green-light); }

.pane-body {
  margin-left: var(--spine-width);
  flex: 1;
  overflow-y: auto;
  padding: 30px 34px 40px;
}

.pane-footer {
  margin-left: var(--spine-width);
  padding: 5px 14px;
  background: var(--modeline);
  border-top: 1px solid var(--rule);
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-soft);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.pane-footer .slug { color: var(--accent-warm); }
.pane-footer .tags { color: var(--green); }

.tag-link {
  color: var(--green);
  text-decoration: none;
}
.tag-link:hover { text-decoration: underline; }
.timeline-entry .tags { font-family: var(--mono); font-size: 12px; }
.note-date .tags { font-size: calc(var(--text) * 0.78); }

.pane-close {
  float: right;
  border: none;
  background: none;
  padding: 0 2px;
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1;
  color: var(--ink-soft);
  cursor: pointer;
}
.pane-close:hover:enabled { color: var(--accent); }
.pane-close:disabled { opacity: 0.3; cursor: default; }

.pane h1.note-title {
  margin: 0 0 6px;
  font-size: calc(var(--text) * 1.6);
  line-height: 1.25;
  letter-spacing: -0.01em;
}

.note-date {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--ink-soft);
  margin-bottom: 22px;
}

.note-content { font-size: var(--text); line-height: 1.6; overflow-wrap: break-word; }
.note-content p { margin: 0 0 1em; }
.note-content h2 { font-size: 1.15em; margin: 1.6em 0 0.5em; }
.note-content h3 { font-size: 1em; margin: 1.4em 0 0.4em; }
.note-content img { max-width: 100%; border: 1px solid var(--rule); }
.note-content a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 2px; }
.note-content a.note-link { color: var(--accent-warm); text-decoration-style: dotted; }
.note-content a.tag-link { color: var(--green); text-decoration: none; }
.note-content a.tag-link:hover { color: var(--green); text-decoration: underline; text-decoration-thickness: 1px; }
.note-content a:hover { color: var(--green); text-decoration-thickness: 2px; }
.note-content a.note-link:hover { text-decoration-thickness: 1px; }
.note-content a:not(.note-link):not(.tag-link):not(:has(img))::after { content: "\2197"; font-size: 0.72em; vertical-align: super; margin-left: 1px; }
.note-content ol, .note-content ul { padding-left: 1.4em; }
.note-content li { margin-bottom: 0.35em; }

.note-content pre {
  font-family: var(--mono);
  font-size: 15px;
  line-height: 1.5;
  background: #1f2428;
  color: #e6e8e3;
  padding: 14px 16px;
  overflow-x: auto;
  border-radius: 3px;
}

.note-content code { font-family: var(--mono); font-size: 0.88em; }

.timeline-year {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--green);
  border-bottom: 1px solid var(--green-light);
  padding-bottom: 4px;
}

.timeline-entry { display: flex; gap: 14px; align-items: baseline; margin: 0 0 0.6em; }

.timeline-date {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-soft);
  flex: 0 0 auto;
}

.timeline-entry a { text-decoration: none; }
.timeline-entry a:hover { text-decoration: underline; }

.backlinks {
  font-size: var(--text);
  margin-top: 40px;
  padding-top: 14px;
  border-top: 1px solid var(--rule);
}

.backlinks h2 {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--green);
  margin: 0 0 10px;
}

.backlinks a {
  display: block;
  color: var(--accent-warm);
  text-decoration: underline dotted;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
  margin-bottom: 6px;
  font-size: 0.8em;
}
.backlinks a:hover { color: var(--green); }
.backlinks .none { color: var(--ink-soft); font-size: 14px; font-style: italic; }

.pane-error { margin-left: var(--spine-width); padding: 30px; color: var(--ink-soft); }

#timearrow {
  position: relative;
  height: 96px;
  margin: 0 26px;
  flex: 0 0 auto;
}

#timearrow::before {
  content: "";
  position: absolute;
  left: 0;
  right: 14px;
  top: 72px;
  border-top: 1px solid var(--ink-soft);
}

#timearrow::after {
  content: "";
  position: absolute;
  right: 8px;
  top: 68.5px;
  border: 4px solid transparent;
  border-left: 7px solid var(--ink-soft);
}

#timearrow:empty { display: none; }

.arrow-arcs {
  position: absolute;
  inset: 0 26px 0 6px;
  width: auto;
  height: 100%;
  pointer-events: none;
}

.arrow-arcs path {
  fill: none;
  stroke: var(--rule);
  stroke-width: 1px;
  transition: stroke 0.1s ease, opacity 0.1s ease;
}

.arrow-arcs path.lit { stroke: var(--green); }
.arrow-arcs path.dim { opacity: 0.25; }

.arrow-dot {
  position: absolute;
  top: 72.5px;
  width: 13px;
  height: 13px;
  padding: 0;
  transform: translate(-50%, -50%);
  border: 1.5px solid var(--pane);
  border-radius: 50%;
  background: var(--accent-warm);
  cursor: pointer;
  transition: transform 0.1s ease;
}

.arrow-dot[data-lane="1"] { top: 61.5px; }
.arrow-dot[data-lane="2"] { top: 50.5px; }
.arrow-dot.in-stack { background: var(--accent); }

.arrow-dot:hover {
  transform: translate(-50%, -50%) scale(1.35);
  z-index: 3;
}

.arrow-dot:hover::after {
  content: attr(data-label);
  position: absolute;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  padding: 4px 9px;
  background: var(--ink);
  color: var(--pane);
  font-family: var(--mono);
  font-size: 11px;
  white-space: nowrap;
  border-radius: 3px;
  pointer-events: none;
  z-index: 4;
}

#timearrow .arrow-dot:first-of-type:hover::after,
#timearrow .arrow-year:first-of-type ~ .arrow-dot:nth-of-type(1):hover::after { transform: translateX(-15%); }

.arrow-year {
  position: absolute;
  top: 78px;
  transform: translateX(-50%);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
}

.arrow-year::before {
  content: "";
  position: absolute;
  left: 50%;
  top: -8px;
  height: 5px;
  border-left: 1px solid var(--rule);
}

@media (prefers-reduced-motion: reduce) {
  .arrow-dot { transition: none; }
}

.toast {
  position: fixed;
  left: 22px;
  bottom: 74px;
  padding: 7px 13px;
  background: var(--ink);
  color: var(--pane);
  font-family: var(--mono);
  font-size: 12px;
  border-radius: 3px;
  z-index: 10;
}

.noscript { padding: 30px; }

a:focus-visible, .pane-spine:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  #panes { scroll-behavior: auto; }
}

@media (max-width: 700px) {
  html, body { height: auto; }
  :root { --text: 16.5px; }

  .site-header { flex-wrap: wrap; row-gap: 8px; }
  .site-search { order: 3; flex-basis: 100%; max-width: none; margin: 0; }

  #timearrow { display: none; }

  #trail {
    display: flex;
    gap: 8px;
    padding: 10px 16px;
    overflow-x: auto;
    border-bottom: 1px solid var(--rule);
    background: var(--spine);
    -webkit-overflow-scrolling: touch;
  }

  #trail:empty { display: none; }

  .trail-chip {
    flex: 0 0 auto;
    max-width: 60vw;
    padding: 8px 14px;
    border: 1px solid var(--rule);
    border-radius: 999px;
    background: var(--pane);
    color: var(--accent);
    font-family: var(--mono);
    font-size: 13px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    cursor: pointer;
  }

  .trail-chip:last-child { color: var(--ink); }
  .trail-chip:active { background: var(--green-light); }

  #panes { display: block; overflow: visible; }
  .pane { position: static; width: 100%; max-width: 100%; height: auto; border-right: none; box-shadow: none; }
  .pane-spine { display: none; }
  .pane-body { margin-left: 0; padding: 22px 18px 30px; overflow-y: visible; }
  .pane-footer, .pane-error { margin-left: 0; }
  .pane h1.note-title { font-size: 24px; }
  .backlinks a { padding: 8px 0; margin-bottom: 0; }
  .site-header { padding: 12px 16px; }
}