:root {
  color-scheme: light;
  --paper: oklch(0.965 0.008 185);
  --paper-deep: oklch(0.93 0.012 185);
  --ink: oklch(0.235 0.018 205);
  --ink-soft: oklch(0.43 0.02 205);
  --ink-faint: oklch(0.61 0.018 205);
  --line: oklch(0.82 0.016 190);
  --line-strong: oklch(0.7 0.026 190);
  --signal: oklch(0.49 0.08 182);
  --signal-dark: oklch(0.36 0.065 182);
  --signal-wash: oklch(0.91 0.025 182);
  --warning: oklch(0.65 0.11 76);
  --display: "Space Grotesk", "Noto Sans SC", sans-serif;
  --body: "Noto Sans SC", sans-serif;
  --mono: "IBM Plex Mono", "Cascadia Code", monospace;
  --shell: min(1180px, calc(100vw - 48px));
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  margin: 0;
  min-width: 320px;
  overflow-x: hidden;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--body);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(circle at 83% 4%, color-mix(in oklch, var(--signal) 8%, transparent), transparent 26rem),
    linear-gradient(115deg, transparent 0 68%, color-mix(in oklch, var(--signal) 3%, transparent) 68% 69%, transparent 69%);
  pointer-events: none;
}

.ambient-grid {
  position: fixed;
  inset: 0;
  z-index: -1;
  opacity: 0.42;
  background-image:
    linear-gradient(color-mix(in oklch, var(--line) 45%, transparent) 1px, transparent 1px),
    linear-gradient(90deg, color-mix(in oklch, var(--line) 45%, transparent) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: linear-gradient(to bottom, black, transparent 68%);
  pointer-events: none;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  color: inherit;
  font: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button:focus-visible,
a:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 4px;
}

code,
pre {
  font-family: var(--mono);
}

.page-shell {
  width: var(--shell);
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid color-mix(in oklch, var(--line) 76%, transparent);
  background: color-mix(in oklch, var(--paper) 90%, transparent);
  backdrop-filter: blur(16px);
}

.site-header-inner {
  width: var(--shell);
  min-height: 66px;
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--display);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.brand-signal {
  width: 8px;
  height: 8px;
  background: var(--signal);
  box-shadow: 0 0 0 4px color-mix(in oklch, var(--signal) 13%, transparent);
}

.brand-divider {
  color: var(--line-strong);
}

.brand-section {
  color: var(--ink-soft);
  font-weight: 500;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 28px;
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--ink-soft);
}

.site-nav a {
  position: relative;
  padding-block: 8px;
}

.site-nav a::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 3px;
  left: 0;
  height: 1px;
  background: var(--signal);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 220ms cubic-bezier(0.22, 1, 0.36, 1);
}

.site-nav a:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

.hero {
  min-height: 390px;
  padding: clamp(72px, 10vw, 126px) 0 72px;
  display: grid;
  grid-template-columns: minmax(0, 1.55fr) minmax(260px, 0.62fr);
  gap: clamp(56px, 9vw, 132px);
  align-items: end;
  border-bottom: 1px solid var(--line);
}

.system-label {
  max-width: 660px;
  margin: 0 0 22px;
  display: flex;
  justify-content: space-between;
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  color: var(--signal-dark);
}

.hero h1 {
  max-width: 780px;
  margin: 0;
  font-family: var(--display);
  font-size: clamp(2.8rem, 6.3vw, 5.6rem);
  font-weight: 600;
  line-height: 0.98;
  letter-spacing: -0.055em;
  text-wrap: balance;
}

.hero h1 span {
  color: var(--ink-soft);
  font-weight: 500;
}

.hero-description {
  max-width: 660px;
  margin: 30px 0 0;
  color: var(--ink-soft);
  font-size: clamp(0.95rem, 1.2vw, 1.06rem);
  line-height: 1.9;
  text-wrap: pretty;
}

.hero-status {
  align-self: end;
  border-top: 2px solid var(--ink);
}

.status-head {
  min-height: 43px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 0.63rem;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
}

.status-live {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--signal-dark);
}

.status-live i {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--signal);
  animation: signal-pulse 2.4s ease-in-out infinite;
}

.status-grid {
  margin: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
}

.status-grid div {
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.status-grid div:nth-child(odd):not(.status-wide) {
  border-right: 1px solid var(--line);
}

.status-grid div:nth-child(even) {
  padding-left: 20px;
}

.status-grid .status-wide {
  grid-column: 1 / -1;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
}

.status-grid dt {
  font-family: var(--mono);
  font-size: 0.61rem;
  letter-spacing: 0.1em;
  color: var(--ink-faint);
}

.status-grid dd {
  margin: 6px 0 0;
  font-family: var(--display);
  font-size: 1.65rem;
  font-weight: 500;
  line-height: 1;
}

.status-wide dd {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--ink-soft);
}

.workspace {
  padding: 74px 0 120px;
  display: grid;
  grid-template-columns: minmax(250px, 0.7fr) minmax(0, 1.65fr);
  gap: clamp(54px, 8vw, 108px);
  align-items: start;
}

.post-index {
  position: sticky;
  top: 98px;
}

.index-heading {
  padding-bottom: 17px;
  display: flex;
  align-items: end;
  justify-content: space-between;
  border-bottom: 2px solid var(--ink);
}

.section-code {
  margin: 0 0 6px;
  font-family: var(--mono);
  font-size: 0.64rem;
  letter-spacing: 0.12em;
  color: var(--signal-dark);
}

.index-heading h2 {
  margin: 0;
  font-family: var(--display);
  font-size: 1.35rem;
  line-height: 1.2;
  letter-spacing: -0.025em;
}

.index-count {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--ink-faint);
}

.post-list {
  transition: opacity 150ms ease;
}

.post-list.is-loading {
  opacity: 0.48;
  pointer-events: none;
}

.post-item {
  width: 100%;
  margin: 0;
  padding: 18px 0;
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr) 18px;
  gap: 12px;
  align-items: start;
  border: 0;
  border-bottom: 1px solid var(--line);
  background: transparent;
  text-align: left;
  cursor: pointer;
  transition: color 180ms ease, padding 220ms cubic-bezier(0.22, 1, 0.36, 1);
}

.post-item:hover,
.post-item.is-active {
  padding-left: 9px;
}

.post-item.is-active {
  color: var(--signal-dark);
}

.post-number,
.post-copy small {
  font-family: var(--mono);
  font-size: 0.63rem;
  color: var(--ink-faint);
}

.post-number {
  padding-top: 3px;
}

.post-copy {
  min-width: 0;
  display: grid;
  gap: 7px;
}

.post-copy strong {
  font-size: 0.86rem;
  font-weight: 500;
  line-height: 1.55;
  text-wrap: pretty;
}

.post-copy small {
  letter-spacing: 0.03em;
}

.post-arrow {
  opacity: 0;
  color: var(--signal);
  font-family: var(--mono);
  font-size: 0.82rem;
  transform: translate(-5px, 5px);
  transition: opacity 180ms ease, transform 180ms ease;
}

.post-item:hover .post-arrow,
.post-item.is-active .post-arrow {
  opacity: 1;
  transform: translate(0, 0);
}

.post-list-message {
  padding: 20px 0;
  color: var(--ink-soft);
  font-size: 0.84rem;
}

.reader {
  min-width: 0;
}

.reader-placeholder {
  min-height: 280px;
  display: grid;
  place-content: center;
  justify-items: center;
  gap: 18px;
  color: var(--ink-faint);
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
}

.reader-placeholder[hidden],
.reader-content[hidden] {
  display: none;
}

.placeholder-line {
  width: 58px;
  height: 1px;
  background: var(--signal);
  animation: scan-line 1.2s ease-in-out infinite alternate;
}

.article-header {
  padding-bottom: 38px;
  border-bottom: 1px solid var(--line);
}

.article-coordinate,
.article-meta {
  display: flex;
  justify-content: space-between;
  font-family: var(--mono);
  font-size: 0.64rem;
  letter-spacing: 0.08em;
}

.article-coordinate {
  margin-bottom: 28px;
  color: var(--signal-dark);
}

.article-meta {
  margin-bottom: 14px;
  color: var(--ink-faint);
}

.article-header h2 {
  max-width: 820px;
  margin: 0;
  font-family: var(--display);
  font-size: clamp(2rem, 4.4vw, 3.7rem);
  font-weight: 600;
  line-height: 1.08;
  letter-spacing: -0.045em;
  text-wrap: balance;
}

.article-summary {
  max-width: 720px;
  margin: 22px 0 0;
  padding-left: 18px;
  border-left: 2px solid var(--signal);
  color: var(--ink-soft);
  font-size: 0.94rem;
  line-height: 1.85;
  text-wrap: pretty;
}

.article-tags {
  margin-top: 22px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
}

.article-tags span {
  position: relative;
  padding-left: 11px;
  font-family: var(--mono);
  font-size: 0.64rem;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
}

.article-tags span::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 0;
  width: 4px;
  height: 4px;
  background: var(--signal);
  transform: translateY(-50%) rotate(45deg);
}

.article-body {
  max-width: 760px;
  padding-top: 48px;
  color: var(--ink);
  font-size: 1rem;
  line-height: 1.92;
  text-wrap: pretty;
}

.article-body > *:first-child {
  margin-top: 0;
}

.article-body h1,
.article-body h2,
.article-body h3 {
  font-family: var(--display);
  color: var(--ink);
  text-wrap: balance;
}

.article-body h1 {
  margin: 0 0 24px;
  font-size: 1.55rem;
  font-weight: 600;
  letter-spacing: -0.025em;
}

.article-body h2 {
  position: relative;
  margin: 64px 0 20px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  font-size: 1.38rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.article-body h2::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 72px;
  height: 1px;
  background: var(--signal);
}

.article-body h3 {
  margin: 36px 0 14px;
  font-size: 1.08rem;
  font-weight: 600;
}

.article-body p {
  margin: 0 0 18px;
}

.article-body ul,
.article-body ol {
  margin: 8px 0 24px;
  padding-left: 1.2rem;
}

.article-body li {
  margin-bottom: 8px;
  padding-left: 6px;
}

.article-body li::marker {
  color: var(--signal);
}

.article-body a {
  color: var(--signal-dark);
  text-decoration: underline;
  text-decoration-color: color-mix(in oklch, var(--signal) 35%, transparent);
  text-underline-offset: 4px;
}

.article-body code {
  padding: 0.12em 0.38em;
  background: var(--paper-deep);
  font-size: 0.86em;
  color: var(--signal-dark);
}

.article-body pre {
  margin: 26px 0;
  padding: 22px;
  overflow-x: auto;
  border-block: 1px solid var(--line);
  background: color-mix(in oklch, var(--paper-deep) 65%, transparent);
  font-size: 0.82rem;
  line-height: 1.7;
}

.article-body blockquote {
  margin: 30px 0;
  padding: 2px 0 2px 20px;
  border-left: 2px solid var(--warning);
  color: var(--ink-soft);
}

.reader-content.is-entering {
  animation: reader-enter 520ms cubic-bezier(0.22, 1, 0.36, 1) both;
}

.site-footer {
  border-top: 1px solid var(--line);
}

.footer-inner {
  min-height: 80px;
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 40px;
  align-items: center;
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.07em;
  color: var(--ink-faint);
}

.footer-inner a {
  transition: color 160ms ease;
}

.footer-inner a:hover {
  color: var(--signal-dark);
}

@keyframes signal-pulse {
  0%,
  100% { opacity: 0.45; }
  50% { opacity: 1; }
}

@keyframes scan-line {
  from { transform: scaleX(0.35); opacity: 0.4; }
  to { transform: scaleX(1); opacity: 1; }
}

@keyframes reader-enter {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 860px) {
  :root {
    --shell: min(100% - 32px, 720px);
  }

  .hero {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .hero-status {
    max-width: 420px;
  }

  .workspace {
    grid-template-columns: 1fr;
    gap: 52px;
  }

  .post-index {
    position: static;
  }

  .post-list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 28px;
  }

  .article-header h2 {
    font-size: clamp(2rem, 8vw, 3.2rem);
  }
}

@media (max-width: 600px) {
  .site-header-inner {
    min-height: 58px;
  }

  .site-nav {
    display: none;
  }

  .hero {
    min-height: auto;
    padding: 68px 0 56px;
  }

  .hero h1 {
    font-size: clamp(2.45rem, 13vw, 3.8rem);
  }

  .system-label span:last-child {
    display: none;
  }

  .post-list {
    grid-template-columns: 1fr;
  }

  .workspace {
    padding: 56px 0 88px;
  }

  .article-coordinate span:last-child {
    display: none;
  }

  .article-body {
    padding-top: 38px;
    font-size: 0.96rem;
  }

  .article-body h2 {
    margin-top: 52px;
  }

  .footer-inner {
    min-height: 96px;
    grid-template-columns: 1fr auto;
    gap: 8px 20px;
  }

  .footer-inner span:nth-child(2) {
    grid-column: 1 / -1;
    grid-row: 2;
  }
}

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

  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }
}