/* 猫の足跡 / webneko.dev
   Original design system for this site.
   Naming is derived from design seed 451221027. */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

html,
body {
  margin: 0;
  padding: 0;
}

html {
  -webkit-text-size-adjust: 100%;
}

[hidden] {
  display: none !important;
}

body {
  background: var(--n451-kami);
  color: var(--n451-sumi);
  font-family: var(--n451-gothic);
  font-size: 16px;
  line-height: 1.8;
  font-feature-settings: "palt" 1;
  text-rendering: optimizeLegibility;
}

a {
  color: inherit;
}

button,
input {
  font: inherit;
  color: inherit;
}

img,
svg {
  display: block;
  max-width: 100%;
}

ul,
ol,
dl,
dd,
p,
h1,
h2,
h3,
h4 {
  margin: 0;
}

button {
  cursor: pointer;
}

:focus-visible {
  outline: 2px solid var(--n451-beni);
  outline-offset: 3px;
}

::selection {
  background: var(--n451-ai);
  color: var(--n451-kami);
}

:root {
  --n451-kami: #f3efe6;
  --n451-kami2: #ebe5d9;
  --n451-sumi: #1b1a17;
  --n451-sumi2: #403d36;
  --n451-ai: #2f4d63;
  --n451-ai2: #3f647e;
  --n451-beni: #a34332;
  --n451-hai: #6e6a61;
  --n451-sen: #c9c1b2;
  --n451-sen2: #ded7ca;
  --n451-chin: #1b1a17;
  --n451-chin-text: #f3efe6;
  --n451-chin-mute: #b9b0a2;
  --n451-chin-line: #3a3630;
  --n451-hiro: 1160px;
  --n451-ma: clamp(1.15rem, 3.2vw, 2.4rem);
  --n451-gothic: "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Yu Gothic", "Meiryo", sans-serif;
  --n451-kaku: "IBM Plex Mono", "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

html[data-n451-theme="yoru"] {
  --n451-kami: #141311;
  --n451-kami2: #1d1b18;
  --n451-sumi: #ece5d8;
  --n451-sumi2: #c8c0b2;
  --n451-ai: #9dc0d6;
  --n451-ai2: #c1dcea;
  --n451-beni: #e08a75;
  --n451-hai: #a59d90;
  --n451-sen: #37332d;
  --n451-sen2: #2a2722;
  --n451-chin: #0d0c0a;
  --n451-chin-text: #ece5d8;
  --n451-chin-mute: #a79e90;
  --n451-chin-line: #302c26;
}

.n451Only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.n451Skip {
  position: fixed;
  top: -100%;
  left: 1rem;
  z-index: 100;
  padding: 0.7rem 1rem;
  background: var(--n451-sumi);
  color: var(--n451-kami);
  text-decoration: none;
  font-family: var(--n451-kaku);
  font-size: 0.75rem;
}

.n451Skip:focus {
  top: 1rem;
}

.n451Frame {
  display: grid;
  grid-template-columns: 4.2rem minmax(0, 1fr);
  min-height: 100vh;
}

.n451Rail {
  position: sticky;
  top: 0;
  align-self: start;
  height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.1rem 0 1.2rem;
  border-right: 1px solid var(--n451-sen);
  background: var(--n451-kami);
  z-index: 30;
}

.n451RailLink {
  display: grid;
  place-items: center;
  width: 2.2rem;
  height: 2.2rem;
  color: var(--n451-sumi);
}

.n451RailLink svg {
  width: 1.65rem;
  height: 1.65rem;
}

.n451RailText {
  writing-mode: vertical-rl;
  font-family: var(--n451-kaku);
  font-size: 0.58rem;
  letter-spacing: 0.24em;
  color: var(--n451-hai);
  text-transform: uppercase;
}

.n451RailFoot {
  writing-mode: vertical-rl;
  font-family: var(--n451-kaku);
  font-size: 0.55rem;
  letter-spacing: 0.16em;
  color: var(--n451-hai);
}

.n451Sheath {
  min-width: 0;
}

.n451Plim {
  width: min(100% - (var(--n451-ma) * 2), var(--n451-hiro));
  margin-inline: auto;
}

.n451Mast {
  position: sticky;
  top: 0;
  z-index: 25;
  background: var(--n451-kami);
  border-bottom: 1px solid var(--n451-sen);
}

.n451MastRow {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.4rem;
  min-height: 4.3rem;
}

.n451Sig {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  min-width: 0;
}

.n451SigMark {
  width: 2rem;
  height: 2rem;
  color: var(--n451-sumi);
  flex: none;
}

.n451SigText {
  display: block;
  font-size: 0.96rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.2;
  white-space: nowrap;
}

.n451SigSub {
  display: block;
  font-family: var(--n451-kaku);
  font-size: 0.56rem;
  letter-spacing: 0.16em;
  color: var(--n451-hai);
  margin-top: 0.18rem;
  white-space: nowrap;
}

.n451MastRight {
  display: flex;
  align-items: center;
  gap: 1.2rem;
  min-width: 0;
}

.n451Menu {
  display: flex;
  align-items: center;
  gap: 1.4rem;
}

.n451MenuLink {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 0.4rem;
  padding: 0.25rem 0;
  font-size: 0.78rem;
  font-weight: 600;
  text-decoration: none;
  color: var(--n451-sumi2);
  white-space: nowrap;
}

.n451MenuLink:hover {
  color: var(--n451-ai);
}

.n451MenuNo {
  font-family: var(--n451-kaku);
  font-size: 0.52rem;
  letter-spacing: 0.08em;
  color: var(--n451-hai);
}

.n451Theme {
  display: inline-grid;
  place-items: center;
  width: 2.1rem;
  height: 2.1rem;
  padding: 0;
  border: 1px solid var(--n451-sen);
  background: transparent;
  color: var(--n451-sumi);
  flex: none;
}

.n451Theme:hover {
  border-color: var(--n451-ai);
  color: var(--n451-ai);
}

.n451Theme svg {
  width: 1rem;
  height: 1rem;
}

html[data-n451-theme="yoru"] .n451ThemeSun {
  display: none;
}

html:not([data-n451-theme="yoru"]) .n451ThemeMoon {
  display: none;
}

.n451Burger {
  display: none;
  width: 2.1rem;
  height: 2.1rem;
  padding: 0.5rem;
  border: 1px solid var(--n451-sen);
  background: transparent;
  color: var(--n451-sumi);
  flex-direction: column;
  justify-content: space-between;
}

.n451BurgerLine {
  display: block;
  width: 100%;
  height: 1px;
  background: currentColor;
}

.n451Main {
  min-width: 0;
}

.n451Lead {
  position: relative;
  overflow: hidden;
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(15rem, 0.65fr);
  gap: clamp(2rem, 5vw, 5rem);
  align-items: center;
  padding: clamp(2.8rem, 7vw, 6rem) 0 clamp(2.4rem, 5vw, 4rem);
  border-bottom: 1px solid var(--n451-sen);
}

.n451Lead::before {
  content: "451";
  position: absolute;
  top: -0.24em;
  right: -0.02em;
  z-index: 0;
  font-family: var(--n451-kaku);
  font-size: clamp(10rem, 25vw, 24rem);
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px var(--n451-sen);
  opacity: 0.62;
  pointer-events: none;
}

.n451LeadCopy {
  position: relative;
  z-index: 1;
  min-width: 0;
}

.n451Kicker {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--n451-kaku);
  font-size: 0.64rem;
  letter-spacing: 0.22em;
  color: var(--n451-ai);
  text-transform: uppercase;
}

.n451Kicker::before {
  content: "";
  width: 0.42rem;
  height: 0.42rem;
  background: var(--n451-beni);
  flex: none;
}

.n451LeadYomi {
  display: block;
  margin-top: 1.1rem;
  font-size: 0.68rem;
  letter-spacing: 0.34em;
  color: var(--n451-hai);
}

.n451LeadTitle {
  margin-top: 0.35rem;
  font-size: clamp(3.3rem, 9vw, 7.2rem);
  font-weight: 700;
  line-height: 0.94;
  letter-spacing: -0.035em;
  color: var(--n451-sumi);
}

.n451LeadText {
  max-width: 35rem;
  margin-top: 1.5rem;
  font-size: clamp(0.96rem, 1.2vw, 1.06rem);
  line-height: 2.05;
  color: var(--n451-sumi2);
}

.n451LeadActions {
  display: flex;
  flex-wrap: wrap;
  gap: 1.1rem 1.6rem;
  margin-top: 1.7rem;
}

.n451Jump {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding-bottom: 0.35rem;
  border-bottom: 2px solid var(--n451-sumi);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-decoration: none;
  color: var(--n451-sumi);
  transition: color 0.18s ease, border-color 0.18s ease;
}

.n451Jump::after {
  content: "→";
  font-family: var(--n451-kaku);
  font-weight: 400;
  transition: transform 0.18s ease;
}

.n451Jump:hover {
  color: var(--n451-ai);
  border-color: var(--n451-ai);
}

.n451Jump:hover::after {
  transform: translateX(3px);
}

.n451JumpAlt {
  border-bottom-width: 1px;
  border-color: var(--n451-sen);
  color: var(--n451-hai);
  font-weight: 500;
}

.n451JumpAlt:hover {
  color: var(--n451-ai);
  border-color: var(--n451-ai);
}

.n451Facts {
  display: flex;
  flex-wrap: wrap;
  gap: 1.6rem 2.2rem;
  margin-top: 2.3rem;
  padding-top: 1.15rem;
  border-top: 1px solid var(--n451-sen);
  list-style: none;
}

.n451Fact {
  min-width: 0;
}

.n451FactNum {
  display: block;
  font-family: var(--n451-kaku);
  font-size: 1.35rem;
  font-weight: 500;
  line-height: 1.2;
  color: var(--n451-sumi);
}

.n451FactLabel {
  display: block;
  margin-top: 0.2rem;
  font-size: 0.64rem;
  letter-spacing: 0.12em;
  color: var(--n451-hai);
}

.n451LeadFigure {
  position: relative;
  z-index: 1;
  min-width: 0;
}

.n451Figure {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 1rem;
  min-height: 23rem;
  padding: 1.15rem;
  border: 1px solid var(--n451-sen);
  background: var(--n451-kami2);
  overflow: hidden;
}

.n451Figure::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(var(--n451-sen) 0.7px, transparent 0.7px);
  background-size: 0.9rem 0.9rem;
  opacity: 0.45;
  pointer-events: none;
}

.n451FigureTag {
  position: relative;
  z-index: 1;
  font-family: var(--n451-kaku);
  font-size: 0.58rem;
  letter-spacing: 0.2em;
  color: var(--n451-hai);
}

.n451FigureSvg {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 13.5rem;
  margin: 0 auto;
  color: var(--n451-ai);
}

.n451FigureSvg svg {
  width: 100%;
  color: var(--n451-ai);
}

.n451FigureCap {
  position: relative;
  z-index: 1;
  display: flex;
  justify-content: space-between;
  gap: 0.8rem;
  padding-top: 0.7rem;
  border-top: 1px solid var(--n451-sen);
  font-family: var(--n451-kaku);
  font-size: 0.58rem;
  letter-spacing: 0.08em;
  color: var(--n451-hai);
}

.n451Stamp {
  position: absolute;
  top: 0.9rem;
  right: 0.9rem;
  z-index: 2;
  display: grid;
  place-items: center;
  width: 3.1rem;
  height: 3.1rem;
  border: 2px solid var(--n451-beni);
  border-radius: 50%;
  color: var(--n451-beni);
  font-family: var(--n451-kaku);
  font-size: 0.58rem;
  line-height: 1.2;
  letter-spacing: 0.06em;
  text-align: center;
  transform: rotate(-8deg);
}

.n451Band {
  padding: clamp(2.6rem, 5vw, 4.5rem) 0;
  border-bottom: 1px solid var(--n451-sen);
  scroll-margin-top: 5.2rem;
}

.n451BandHead {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1.5rem;
  margin-bottom: 1.7rem;
}

.n451BandNo {
  display: block;
  margin-bottom: 0.45rem;
  font-family: var(--n451-kaku);
  font-size: 0.62rem;
  letter-spacing: 0.18em;
  color: var(--n451-ai);
}

.n451BandTitle {
  font-size: clamp(1.45rem, 3vw, 2.05rem);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.02em;
  color: var(--n451-sumi);
}

.n451BandNote {
  max-width: 19rem;
  font-family: var(--n451-kaku);
  font-size: 0.66rem;
  line-height: 1.8;
  letter-spacing: 0.02em;
  color: var(--n451-hai);
  text-align: right;
}

.n451Notes {
  border-top: 1px solid var(--n451-sen);
}

.n451Note {
  display: grid;
  grid-template-columns: 3.2rem minmax(0, 1fr);
  gap: 1.1rem;
  padding: 1.25rem 0.55rem;
  margin: 0 -0.55rem;
  border-bottom: 1px solid var(--n451-sen);
  transition: background-color 0.16s ease;
}

.n451Note:hover {
  background: var(--n451-kami2);
}

.n451NoteNo {
  padding-top: 0.4rem;
  font-family: var(--n451-kaku);
  font-size: 0.66rem;
  letter-spacing: 0.08em;
  color: var(--n451-hai);
}

.n451NoteBody {
  min-width: 0;
}

.n451NoteTitle {
  font-size: clamp(1.02rem, 1.7vw, 1.24rem);
  font-weight: 700;
  line-height: 1.55;
  color: var(--n451-sumi);
}

.n451NoteTitle a {
  text-decoration: none;
}

.n451NoteTitle a:hover {
  color: var(--n451-ai);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
}

.n451NoteMeta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.25rem 0.85rem;
  margin-top: 0.3rem;
  font-family: var(--n451-kaku);
  font-size: 0.6rem;
  letter-spacing: 0.04em;
  color: var(--n451-hai);
}

.n451NoteDek {
  max-width: 48rem;
  margin-top: 0.45rem;
  font-size: 0.88rem;
  line-height: 1.8;
  color: var(--n451-sumi2);
}

.n451NoteTags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem 0.75rem;
  margin-top: 0.45rem;
}

.n451Chip {
  font-family: var(--n451-kaku);
  font-size: 0.6rem;
  letter-spacing: 0.02em;
  color: var(--n451-ai);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 0.08rem;
}

.n451Chip:hover {
  border-color: var(--n451-ai);
}

.n451Topics {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 1px;
  border: 1px solid var(--n451-sen);
  background: var(--n451-sen);
}

.n451Topic {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  min-height: 12rem;
  padding: 1.05rem;
  background: var(--n451-kami);
  min-width: 0;
  transition: background-color 0.16s ease;
}

.n451Topic:hover {
  background: var(--n451-kami2);
}

.n451TopicTitle {
  font-size: 0.94rem;
  font-weight: 700;
  line-height: 1.55;
  color: var(--n451-sumi);
}

.n451TopicCount {
  font-family: var(--n451-kaku);
  font-size: 0.58rem;
  letter-spacing: 0.08em;
  color: var(--n451-ai);
}

.n451TopicText {
  flex: 1;
  font-size: 0.76rem;
  line-height: 1.8;
  color: var(--n451-sumi2);
}

.n451TopicLink {
  margin-top: auto;
  font-family: var(--n451-kaku);
  font-size: 0.62rem;
  letter-spacing: 0.04em;
  color: var(--n451-ai);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 0.1rem;
  align-self: flex-start;
}

.n451TopicLink::after {
  content: " →";
}

.n451TopicLink:hover {
  border-color: var(--n451-ai);
}

.n451Tools {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem 1.5rem;
  margin-bottom: 1rem;
}

.n451Field {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  min-width: min(100%, 17rem);
  flex: 1 1 17rem;
}

.n451Label {
  font-family: var(--n451-kaku);
  font-size: 0.58rem;
  letter-spacing: 0.14em;
  color: var(--n451-hai);
}

.n451Input {
  width: 100%;
  padding: 0.55rem 0.7rem;
  border: 1px solid var(--n451-sen);
  border-radius: 0;
  background: var(--n451-kami);
  color: var(--n451-sumi);
  font-size: 0.86rem;
}

.n451Input:focus {
  outline: 2px solid var(--n451-beni);
  outline-offset: 2px;
}

.n451Reset {
  padding: 0.52rem 0.8rem;
  border: 1px solid var(--n451-sen);
  border-radius: 0;
  background: transparent;
  color: var(--n451-sumi);
  font-family: var(--n451-kaku);
  font-size: 0.62rem;
  letter-spacing: 0.06em;
}

.n451Reset:hover {
  background: var(--n451-kami2);
  border-color: var(--n451-ai);
  color: var(--n451-ai);
}

.n451Status {
  margin-bottom: 1rem;
  font-family: var(--n451-kaku);
  font-size: 0.62rem;
  letter-spacing: 0.04em;
  color: var(--n451-hai);
}

.n451ActiveTag {
  color: var(--n451-ai);
  font-weight: 700;
}

.n451TagCloud {
  display: flex;
  flex-wrap: wrap;
  gap: 0.34rem 0.5rem;
  margin-bottom: 1.5rem;
  padding-bottom: 1.2rem;
  border-bottom: 1px solid var(--n451-sen);
}

.n451Tag {
  display: inline-flex;
  align-items: center;
  gap: 0.28rem;
  padding: 0.22rem 0.42rem;
  border: 1px solid var(--n451-sen2);
  background: var(--n451-kami);
  color: var(--n451-hai);
  font-family: var(--n451-kaku);
  font-size: 0.6rem;
  line-height: 1.4;
  text-decoration: none;
}

.n451Tag:hover {
  border-color: var(--n451-ai);
  color: var(--n451-ai);
}

.n451Tag.n451IsOn {
  border-color: var(--n451-ai);
  background: var(--n451-ai);
  color: var(--n451-kami);
}

.n451TagCount {
  font-size: 0.52rem;
}

.n451Year {
  margin-top: 2rem;
}

.n451YearHead {
  position: sticky;
  top: 4.3rem;
  z-index: 10;
  display: flex;
  align-items: baseline;
  gap: 0.8rem;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--n451-sen);
  background: var(--n451-kami);
  font-family: var(--n451-kaku);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  color: var(--n451-ai);
}

.n451YearCount {
  font-size: 0.56rem;
  color: var(--n451-hai);
}

.n451Empty {
  margin-top: 1.5rem;
  padding: 1.4rem;
  border: 1px dashed var(--n451-sen);
  color: var(--n451-sumi2);
  font-size: 0.9rem;
}

.n451Empty a {
  color: var(--n451-ai);
}

.n451AboutGrid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(14rem, 0.85fr);
  gap: clamp(2rem, 5vw, 4rem);
  align-items: start;
}

.n451AboutText {
  max-width: 40rem;
  font-size: 0.96rem;
  line-height: 2;
  color: var(--n451-sumi2);
}

.n451AboutText p + p {
  margin-top: 1rem;
}

.n451AboutList {
  margin-top: 1.4rem;
  padding: 0;
  list-style: none;
}

.n451AboutList li {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.55rem 0;
  border-top: 1px solid var(--n451-sen);
  font-family: var(--n451-kaku);
  font-size: 0.62rem;
  color: var(--n451-hai);
}

.n451AboutList strong {
  color: var(--n451-sumi);
  font-weight: 500;
}

.n451AboutMark {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  min-height: 16rem;
  padding: 2rem;
  border: 1px solid var(--n451-sen);
  background: var(--n451-kami2);
}

.n451AboutMark svg {
  width: 5rem;
  height: 5rem;
  color: var(--n451-sumi);
}

.n451AboutMark span {
  font-family: var(--n451-kaku);
  font-size: 0.58rem;
  letter-spacing: 0.2em;
  color: var(--n451-sumi2);
}

.n451Colophon {
  background: var(--n451-chin);
  color: var(--n451-chin-text);
}

.n451ColophonIn {
  padding: clamp(2rem, 4vw, 3.2rem) 0 1.3rem;
}

.n451ColophonMain {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1.5rem;
  padding-bottom: 1.4rem;
  border-bottom: 1px solid var(--n451-chin-line);
}

.n451ColophonName {
  font-size: clamp(1.7rem, 4vw, 2.9rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.n451ColophonSub {
  display: block;
  margin-top: 0.3rem;
  font-family: var(--n451-kaku);
  font-size: 0.58rem;
  letter-spacing: 0.18em;
  color: var(--n451-chin-mute);
}

.n451ColophonNav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 1.2rem;
}

.n451ColophonLink {
  font-family: var(--n451-kaku);
  font-size: 0.62rem;
  letter-spacing: 0.04em;
  color: var(--n451-chin-mute);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 0.1rem;
}

.n451ColophonLink:hover {
  color: var(--n451-chin-text);
  border-color: var(--n451-chin-text);
}

.n451ColophonFine {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem 1.2rem;
  padding-top: 1rem;
  font-family: var(--n451-kaku);
  font-size: 0.56rem;
  letter-spacing: 0.04em;
  color: var(--n451-chin-mute);
}

.n451ColophonYear {
  color: var(--n451-chin-text);
  font-weight: 500;
}

.n451Post {
  padding: clamp(2rem, 4.5vw, 3.4rem) 0 clamp(3rem, 6vw, 5rem);
}

.n451Crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  margin-bottom: 1.7rem;
  font-family: var(--n451-kaku);
  font-size: 0.6rem;
  color: var(--n451-hai);
}

.n451Crumb a {
  color: var(--n451-ai);
  text-decoration: none;
}

.n451Crumb a:hover {
  text-decoration: underline;
}

.n451CrumbSep {
  color: var(--n451-sen);
}

.n451PostGrid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 15.5rem;
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: start;
}

.n451PostHead {
  padding-bottom: 1.4rem;
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--n451-sen);
}

.n451PostNo {
  font-family: var(--n451-kaku);
  font-size: 0.62rem;
  letter-spacing: 0.16em;
  color: var(--n451-ai);
}

.n451PostTitle {
  margin-top: 0.45rem;
  font-size: clamp(1.95rem, 4.6vw, 3.4rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.025em;
  color: var(--n451-sumi);
  overflow-wrap: anywhere;
}

.n451PostDek {
  max-width: 42rem;
  margin-top: 0.9rem;
  font-size: 0.98rem;
  line-height: 1.95;
  color: var(--n451-sumi2);
}

.n451PostMeta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem 1.1rem;
  margin-top: 1rem;
  font-family: var(--n451-kaku);
  font-size: 0.6rem;
  letter-spacing: 0.04em;
  color: var(--n451-hai);
}

.n451PostTags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem 0.7rem;
}

.n451Prose {
  max-width: 42rem;
  font-size: 1rem;
  line-height: 2.05;
  color: var(--n451-sumi2);
}

.n451Prose p {
  margin-bottom: 1.25rem;
}

.n451Prose h2 {
  margin: 1.9rem 0 0.7rem;
  font-size: 1.2rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--n451-sumi);
}

.n451Prose ul,
.n451Prose ol {
  margin: 0 0 1.2rem;
  padding-left: 1.3rem;
}

.n451Prose li {
  margin: 0.3rem 0;
}

.n451Prose code {
  padding: 0.08em 0.32em;
  border: 1px solid var(--n451-sen2);
  background: var(--n451-kami2);
  font-family: var(--n451-kaku);
  font-size: 0.84em;
}

.n451Prose a {
  color: var(--n451-ai);
  text-underline-offset: 0.18em;
}

.n451Points {
  margin-top: 1.3rem;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--n451-sen);
}

.n451Point {
  display: grid;
  grid-template-columns: 2rem minmax(0, 1fr);
  gap: 0.55rem;
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--n451-sen);
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--n451-sumi);
}

.n451PointNo {
  padding-top: 0.32rem;
  font-family: var(--n451-kaku);
  font-size: 0.58rem;
  color: var(--n451-ai);
}

.n451Refs {
  margin-top: 2.5rem;
  padding-top: 1.4rem;
  border-top: 1px solid var(--n451-sen);
}

.n451Refs h2 {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--n451-sumi);
}

.n451RefNote {
  margin: 0.3rem 0 0.9rem;
  font-size: 0.74rem;
  line-height: 1.8;
  color: var(--n451-hai);
}

.n451RefList {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 1.5rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.n451Ref {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.2rem 0.8rem;
  padding: 0.52rem 0;
  border-bottom: 1px solid var(--n451-sen2);
  min-width: 0;
}

.n451RefLink {
  font-size: 0.8rem;
  line-height: 1.6;
  color: var(--n451-ai);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.n451RefLink:hover {
  border-color: var(--n451-ai);
}

.n451RefHost {
  font-family: var(--n451-kaku);
  font-size: 0.52rem;
  letter-spacing: 0.02em;
  color: var(--n451-hai);
  overflow-wrap: anywhere;
}

.n451Related {
  margin-top: 2.3rem;
}

.n451RelatedTitle {
  margin-bottom: 0.7rem;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--n451-sumi);
}

.n451RelatedList {
  margin: 0;
  padding: 0;
  list-style: none;
}

.n451RelatedItem {
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--n451-sen2);
}

.n451RelatedLink {
  display: flex;
  gap: 0.7rem;
  align-items: baseline;
  font-size: 0.86rem;
  line-height: 1.6;
  color: var(--n451-sumi);
  text-decoration: none;
}

.n451RelatedLink:hover {
  color: var(--n451-ai);
}

.n451RelatedNo {
  font-family: var(--n451-kaku);
  font-size: 0.56rem;
  color: var(--n451-hai);
  flex: none;
}

.n451Side {
  position: sticky;
  top: 5.5rem;
  display: grid;
  gap: 1.3rem;
  font-size: 0.78rem;
}

.n451SideBlock {
  padding-top: 0.75rem;
  border-top: 2px solid var(--n451-sumi);
}

.n451SideTitle {
  margin-bottom: 0.55rem;
  font-family: var(--n451-kaku);
  font-size: 0.56rem;
  letter-spacing: 0.16em;
  color: var(--n451-hai);
}

.n451SideTags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem 0.6rem;
}

.n451SideNav {
  display: grid;
  gap: 0.32rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.n451SideLink {
  font-size: 0.74rem;
  color: var(--n451-ai);
  text-decoration: none;
}

.n451SideLink:hover {
  text-decoration: underline;
}

.n451SideNote {
  margin-top: 0.4rem;
  font-size: 0.68rem;
  line-height: 1.8;
  color: var(--n451-hai);
}

.n451Pager {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 2.8rem;
  border: 1px solid var(--n451-sen);
  background: var(--n451-sen);
}

.n451PagerLink {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 0.95rem;
  background: var(--n451-kami);
  text-decoration: none;
  min-width: 0;
}

.n451PagerLink:hover {
  background: var(--n451-kami2);
}

.n451PagerLink[rel="next"] {
  text-align: right;
  align-items: flex-end;
}

.n451PagerDir {
  font-family: var(--n451-kaku);
  font-size: 0.54rem;
  letter-spacing: 0.12em;
  color: var(--n451-hai);
}

.n451PagerTitle {
  font-size: 0.84rem;
  font-weight: 700;
  line-height: 1.6;
  color: var(--n451-sumi);
  overflow-wrap: anywhere;
}

.n451BackTop {
  display: inline-block;
  margin-top: 1.2rem;
  font-family: var(--n451-kaku);
  font-size: 0.62rem;
  letter-spacing: 0.04em;
  color: var(--n451-ai);
  text-decoration: none;
}

.n451BackTop:hover {
  text-decoration: underline;
}

.n451Error {
  min-height: 52vh;
  padding: clamp(3.5rem, 9vw, 7rem) 0;
}

.n451ErrorCode {
  font-family: var(--n451-kaku);
  font-size: clamp(4rem, 13vw, 9rem);
  line-height: 1;
  color: var(--n451-hai);
}

.n451ErrorTitle {
  margin: 1rem 0 0;
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  font-weight: 700;
}

.n451ErrorText {
  max-width: 34rem;
  margin-top: 0.9rem;
  color: var(--n451-sumi2);
}

.n451ErrorLinks {
  display: flex;
  flex-wrap: wrap;
  gap: 1.2rem;
  margin-top: 1.4rem;
}

.n451MiniPage {
  padding: clamp(2.5rem, 6vw, 4.5rem) 0;
}

.n451MiniTitle {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 700;
}

.n451MiniText {
  max-width: 40rem;
  margin-top: 1rem;
  color: var(--n451-sumi2);
}

.n451MiniLinks {
  display: flex;
  flex-wrap: wrap;
  gap: 1.2rem;
  margin-top: 1.4rem;
}

@media (max-width: 1100px) {
  .n451Lead {
    grid-template-columns: 1fr;
    gap: 2.4rem;
  }

  .n451LeadFigure {
    max-width: 27rem;
    margin-inline: auto;
  }

  .n451Topics {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .n451PostGrid {
    grid-template-columns: 1fr;
  }

  .n451Side {
    position: static;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1rem;
  }
}

@media (max-width: 900px) {
  .n451Frame {
    grid-template-columns: 1fr;
  }

  .n451Rail {
    display: none;
  }

  .n451Topics {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .n451AboutGrid {
    grid-template-columns: 1fr;
  }

  .n451AboutMark {
    order: -1;
    min-height: 12rem;
  }
}

@media (max-width: 880px) {
  .n451MastRight {
    gap: 0.55rem;
  }

  .n451Burger {
    display: inline-flex;
  }

  .n451Menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 0.7rem var(--n451-ma) 1rem;
    border-bottom: 1px solid var(--n451-sen);
    background: var(--n451-kami);
  }

  .n451Menu[data-n451-open="true"] {
    display: flex;
  }

  .n451MenuLink {
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--n451-sen2);
  }

  .n451Theme {
    align-self: flex-start;
    margin-top: 0.8rem;
  }

  .n451MastRow {
    min-height: 3.9rem;
  }

  .n451YearHead {
    top: 3.9rem;
  }
}

@media (max-width: 640px) {
  .n451Lead {
    padding-top: 2.4rem;
  }

  .n451Lead::before {
    font-size: 12rem;
    top: -0.4rem;
    right: -0.6rem;
    opacity: 0.35;
  }

  .n451LeadTitle {
    font-size: clamp(3rem, 17vw, 4.6rem);
  }

  .n451LeadText {
    line-height: 1.95;
  }

  .n451Facts {
    gap: 1.2rem 1.6rem;
  }

  .n451Figure {
    min-height: 19rem;
  }

  .n451BandHead {
    display: block;
  }

  .n451BandNote {
    max-width: none;
    margin-top: 0.6rem;
    text-align: left;
  }

  .n451Note {
    grid-template-columns: 2.5rem minmax(0, 1fr);
    gap: 0.8rem;
  }

  .n451Topics {
    grid-template-columns: 1fr;
  }

  .n451Topic {
    min-height: 0;
  }

  .n451RefList {
    grid-template-columns: 1fr;
  }

  .n451Side {
    grid-template-columns: 1fr;
  }

  .n451Pager {
    grid-template-columns: 1fr;
  }

  .n451PagerLink[rel="next"] {
    text-align: left;
    align-items: flex-start;
  }

  .n451ColophonMain {
    display: block;
  }

  .n451ColophonNav {
    margin-top: 1.1rem;
  }
}

@media (max-width: 420px) {
  .n451PostTitle {
    font-size: 1.75rem;
  }

  .n451SigSub {
    display: none;
  }

  .n451LeadTitle {
    font-size: 2.9rem;
  }

  .n451LeadActions {
    display: grid;
    gap: 0.9rem;
  }

  .n451Jump {
    align-self: start;
  }

  .n451Stamp {
    width: 2.7rem;
    height: 2.7rem;
    font-size: 0.52rem;
  }

  .n451AboutMark {
    padding: 1.2rem;
  }
}

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

  .n451Jump,
  .n451Jump::after,
  .n451Note,
  .n451Topic {
    transition: none;
  }
}

@media print {
  .n451Rail,
  .n451Mast,
  .n451Colophon,
  .n451Side,
  .n451Pager,
  .n451Skip {
    display: none;
  }

  .n451Frame {
    display: block;
  }

  .n451PostGrid {
    display: block;
  }
}

.n451Feed {
  padding: clamp(2.2rem, 5vw, 3.6rem) 0 clamp(3rem, 7vw, 5rem);
}

.n451FeedHead {
  max-width: 46rem;
}

.n451FeedTitle {
  margin-top: 0.6rem;
  font-size: clamp(2rem, 4.5vw, 3.1rem);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: 0.01em;
}

.n451FeedText {
  max-width: 42rem;
  margin-top: 1rem;
  color: var(--n451-sumi2);
}

.n451FeedActions {
  display: flex;
  flex-wrap: wrap;
  gap: 1.1rem;
  margin-top: 1.5rem;
}

.n451FeedBody {
  display: grid;
  grid-template-columns: 17rem minmax(0, 1fr);
  gap: clamp(1.6rem, 4vw, 3.4rem);
  align-items: start;
  margin-top: clamp(2rem, 4vw, 3rem);
}

.n451FeedAside {
  position: sticky;
  top: 5rem;
  padding-top: 1.1rem;
  border-top: 2px solid var(--n451-sumi);
}

.n451FeedMark {
  max-width: 14rem;
  margin: 0 auto 1.2rem;
  color: var(--n451-ai);
}

.n451FeedMarkImg {
  padding: 1rem;
  background: #e8e2d5;
  border: 1px solid var(--n451-sen);
}

.n451FeedMarkImg img {
  width: 100%;
  height: auto;
}

.n451FeedKaku {
  font-family: var(--n451-kaku);
  font-size: 0.66rem;
  letter-spacing: 0.08em;
  color: var(--n451-hai);
}

.n451FeedAside p {
  margin-top: 0.75rem;
  font-size: 0.82rem;
  line-height: 1.9;
  color: var(--n451-sumi2);
}

.n451FeedAside p:first-child {
  margin-top: 0;
}

.n451FeedAside a {
  color: var(--n451-ai);
  text-decoration: none;
  border-bottom: 1px solid var(--n451-sen);
}

.n451FeedList {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--n451-sen);
}

.n451FeedItem {
  display: grid;
  grid-template-columns: 3.2rem minmax(0, 1fr);
  gap: 1.1rem;
  padding: 1.2rem 0.4rem;
  border-bottom: 1px solid var(--n451-sen);
}

.n451FeedNo {
  padding-top: 0.25rem;
  font-family: var(--n451-kaku);
  font-size: 0.72rem;
  color: var(--n451-hai);
}

.n451FeedDate {
  font-family: var(--n451-kaku);
  font-size: 0.68rem;
  letter-spacing: 0.04em;
  color: var(--n451-hai);
}

.n451FeedItemTitle {
  margin-top: 0.2rem;
  font-size: 1.02rem;
  font-weight: 700;
  line-height: 1.6;
}

.n451FeedItemTitle a {
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.16s ease;
}

.n451FeedItemTitle a:hover {
  border-color: var(--n451-sumi);
}

.n451FeedItemText {
  margin-top: 0.35rem;
  font-size: 0.84rem;
  line-height: 1.85;
  color: var(--n451-sumi2);
}

@media (max-width: 900px) {
  .n451FeedBody {
    grid-template-columns: 1fr;
  }

  .n451FeedAside {
    position: static;
    display: grid;
    grid-template-columns: 9rem minmax(0, 1fr);
    gap: 1.2rem;
    align-items: center;
  }

  .n451FeedMark {
    margin: 0;
  }
}

@media (max-width: 640px) {
  .n451FeedItem {
    grid-template-columns: 2.5rem minmax(0, 1fr);
    gap: 0.8rem;
  }

  .n451FeedAside {
    grid-template-columns: 1fr;
  }

  .n451FeedMark {
    max-width: 9rem;
    margin: 0 auto;
  }
}

@media (max-width: 420px) {
  .n451FeedTitle {
    font-size: 1.8rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .n451FeedItemTitle a {
    transition: none;
  }
}