/* ============================================================
   Tokens
   ============================================================ */
:root {
  --bg: #ffffff;
  --bg-soft: #f6f6f6;
  --bg-muted: #ededed;
  --text: #0d0d0d;
  --text-2: #5d5d5d;
  --text-3: #8f8f8f;
  --border: #e6e6e6;
  --border-strong: #cfcfcf;
  --accent: #0d0d0d;
  --accent-contrast: #ffffff;
  --bar: #c9c9c9;
  --bar-hl: #0d0d0d;
  --code-bg: #f6f6f6;
  --mark: #fff3b0;

  --tok-keyword: #a3248a;
  --tok-string: #1a7f37;
  --tok-number: #b35900;
  --tok-comment: #8f8f8f;
  --tok-title: #1f5fd1;
  --tok-attr: #6f42c1;

  --font-sans: 'Pretendard Variable', Pretendard, -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Apple SD Gothic Neo',
    'Noto Sans KR', sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --header-h: 64px;
  --w-narrow: 720px;
  --w-title: 880px;
  --w-prose: 680px;
  --w-wide: 1080px;
  --w-page: 1280px;
  --gutter: 24px;
  --radius: 8px;
  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);

  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme='light']) {
    --bg: #0b0b0b;
    --bg-soft: #161616;
    --bg-muted: #222222;
    --text: #f3f3f3;
    --text-2: #a8a8a8;
    --text-3: #6f6f6f;
    --border: #262626;
    --border-strong: #3a3a3a;
    --accent: #f3f3f3;
    --accent-contrast: #0b0b0b;
    --bar: #3d3d3d;
    --bar-hl: #f3f3f3;
    --code-bg: #141414;
    --mark: #5a4b00;
    --tok-keyword: #ff7ac6;
    --tok-string: #7ee2a8;
    --tok-number: #ffb86b;
    --tok-comment: #6f6f6f;
    --tok-title: #7cb7ff;
    --tok-attr: #c4a7ff;
    color-scheme: dark;
  }
}

:root[data-theme='dark'] {
  --bg: #0b0b0b;
  --bg-soft: #161616;
  --bg-muted: #222222;
  --text: #f3f3f3;
  --text-2: #a8a8a8;
  --text-3: #6f6f6f;
  --border: #262626;
  --border-strong: #3a3a3a;
  --accent: #f3f3f3;
  --accent-contrast: #0b0b0b;
  --bar: #3d3d3d;
  --bar-hl: #f3f3f3;
  --code-bg: #141414;
  --mark: #5a4b00;
  --tok-keyword: #ff7ac6;
  --tok-string: #7ee2a8;
  --tok-number: #ffb86b;
  --tok-comment: #6f6f6f;
  --tok-title: #7cb7ff;
  --tok-attr: #c4a7ff;
  color-scheme: dark;
}

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-padding-top: calc(var(--header-h) + 24px);
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  font-feature-settings: 'ss05', 'tnum' 0;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  word-break: keep-all;
  overflow-wrap: break-word;
}

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

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

::selection {
  background: var(--mark);
}

:focus-visible {
  outline: 2px solid var(--text);
  outline-offset: 3px;
  border-radius: 4px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 8px;
  z-index: 100;
  padding: 8px 14px;
  background: var(--accent);
  color: var(--accent-contrast);
  border-radius: 999px;
}
.skip-link:focus {
  left: 16px;
}

.container,
.container-narrow,
.container-wide {
  width: 100%;
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.container {
  max-width: calc(var(--w-page) + var(--gutter) * 2);
}
.container-narrow {
  max-width: calc(var(--w-narrow) + var(--gutter) * 2);
}
.container-wide {
  max-width: calc(var(--w-wide) + var(--gutter) * 2);
}

/* ============================================================
   Header
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--header-h);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(180%) blur(16px);
  -webkit-backdrop-filter: saturate(180%) blur(16px);
}

.header-inner {
  height: 100%;
  max-width: calc(var(--w-page) + var(--gutter) * 2);
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: flex;
  align-items: center;
  gap: 40px;
}

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  font-weight: 650;
  font-size: 18px;
  letter-spacing: -0.02em;
  white-space: nowrap;
}
.brand-sub {
  font-weight: 450;
  font-size: 14px;
  color: var(--text-2);
  letter-spacing: -0.01em;
}

.nav {
  display: flex;
  gap: 28px;
  font-size: 14px;
  color: var(--text-2);
}
.nav a {
  transition: color 0.15s;
}
.nav a:hover,
.nav a[aria-current='page'] {
  color: var(--text);
}

.header-actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 8px;
}

.icon-btn {
  display: inline-grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: var(--text);
  cursor: pointer;
  transition: background 0.15s;
}
.icon-btn:hover {
  background: var(--bg-muted);
}

.theme-toggle .i-moon {
  display: none;
}
:root[data-theme='dark'] .theme-toggle .i-sun {
  display: none;
}
:root[data-theme='dark'] .theme-toggle .i-moon {
  display: block;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme='light']) .theme-toggle .i-sun {
    display: none;
  }
  :root:not([data-theme='light']) .theme-toggle .i-moon {
    display: block;
  }
}

.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
}
.menu-toggle span {
  display: block;
  width: 16px;
  height: 1.5px;
  background: currentColor;
  transition: transform 0.2s var(--ease);
}
.menu-toggle[aria-expanded='true'] span:first-child {
  transform: translateY(3.25px) rotate(45deg);
}
.menu-toggle[aria-expanded='true'] span:last-child {
  transform: translateY(-3.25px) rotate(-45deg);
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  line-height: 1;
  height: 34px;
  padding: 0 10px;
  border-radius: 999px;
  font-size: 13px;
  color: var(--text-2);
  transition: background 0.15s, color 0.15s;
}
.lang-switch svg {
  flex: none;
  display: block;
}
.lang-switch:hover {
  background: var(--bg-muted);
  color: var(--text);
}
.lang-short {
  display: none;
}

/* ============================================================
   Pills / buttons
   ============================================================ */
.pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 40px;
  padding: 0 18px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 500;
  white-space: nowrap;
  transition: opacity 0.15s, background 0.15s, border-color 0.15s;
}
.pill-sm {
  height: 34px;
  padding: 0 14px;
  font-size: 13px;
}
.pill-dark {
  background: var(--accent);
  color: var(--accent-contrast);
}
.pill-dark:hover {
  opacity: 0.82;
}
.pill-outline {
  border: 1px solid var(--border-strong);
}
.pill-outline:hover {
  background: var(--bg-soft);
}
.pill .arrow {
  margin-left: 2px;
}

.link-arrow {
  font-size: 14px;
  color: var(--text-2);
}
.link-arrow::after {
  content: ' →';
}
.link-arrow:hover {
  color: var(--text);
}

/* ============================================================
   Meta line
   ============================================================ */
.meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 14px;
  color: var(--text-2);
}
.meta-center {
  justify-content: center;
}
.meta-dot {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: currentColor;
  opacity: 0.6;
}
a.meta-cat:hover {
  color: var(--text);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ============================================================
   Cover art (generated gradients)
   ============================================================ */
.cover {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  background: var(--bg-muted);
}
.cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.cover-pixel {
  background: #0a0a0a;
}
.cover-pixel img {
  image-rendering: pixelated;
}

.cover-card {
  aspect-ratio: 16 / 10;
}
.cover-featured {
  aspect-ratio: 16 / 10;
}
.cover-hero {
  aspect-ratio: 16 / 9;
}
.cover-wide.cover-hero {
  aspect-ratio: 1200 / 630; /* show the whole cover, same frame as the OG image */
}

.card .cover,
.featured .cover {
  transition: transform 0.5s var(--ease);
}
.card a:hover .cover,
.featured:hover .cover {
  transform: scale(1.015);
}

/* ============================================================
   Index
   ============================================================ */
.index-hero {
  padding-top: 72px;
  padding-bottom: 40px;
}
.index-hero h1 {
  margin: 0;
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  line-height: 1.05;
  font-weight: 600;
  letter-spacing: -0.04em;
}
.lede {
  max-width: 560px;
  margin: 20px 0 0;
  font-size: 18px;
  color: var(--text-2);
}

.chips {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  padding-bottom: 32px;
  margin-bottom: 40px;
  border-bottom: 1px solid var(--border);
}
.chip {
  height: 34px;
  display: inline-flex;
  align-items: center;
  padding: 0 14px;
  border-radius: 999px;
  font-size: 14px;
  background: var(--bg-soft);
  color: var(--text-2);
  transition: background 0.15s, color 0.15s;
}
.chip:hover {
  color: var(--text);
}
.chip.is-active {
  background: var(--accent);
  color: var(--accent-contrast);
}

.featured {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  gap: 48px;
  align-items: center;
  padding-bottom: 64px;
  margin-bottom: 56px;
  border-bottom: 1px solid var(--border);
}
.featured-media {
  display: block;
}
.featured h2 {
  margin: 16px 0 16px;
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  line-height: 1.15;
  font-weight: 600;
  letter-spacing: -0.03em;
}
.featured h2 a:hover {
  opacity: 0.75;
}
.featured p {
  margin: 0 0 28px;
  color: var(--text-2);
  font-size: 17px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 48px 32px;
}
.card a {
  display: block;
}
.card-body {
  padding-top: 16px;
}
.card h3 {
  margin: 0 0 10px;
  font-size: 19px;
  line-height: 1.35;
  font-weight: 600;
  letter-spacing: -0.02em;
}
.card a:hover h3 {
  opacity: 0.75;
}
.card .meta {
  font-size: 13px;
}
.card[hidden],
.featured[hidden] {
  display: none;
}

.empty {
  color: var(--text-2);
  padding: 48px 0;
}

/* ============================================================
   Post
   ============================================================ */
.draft-banner {
  padding: 10px var(--gutter);
  background: var(--bg-muted);
  border-bottom: 1px solid var(--border);
  color: var(--text-2);
  font-size: 13px;
  text-align: center;
}
.post-header {
  max-width: calc(var(--w-title) + var(--gutter) * 2);
  padding-top: 88px;
  padding-bottom: 56px;
  text-align: center;
}
.post-header h1 {
  margin: 20px 0 0;
  font-size: clamp(2.25rem, 5.2vw, 3.75rem);
  line-height: 1.1;
  font-weight: 600;
  letter-spacing: -0.035em;
  text-wrap: balance;
}
.post-summary {
  margin: 24px auto 0;
  max-width: 600px;
  font-size: 19px;
  line-height: 1.55;
  color: var(--text-2);
  text-wrap: pretty;
}
.post-actions {
  margin-top: 32px;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px;
}

.post-hero {
  margin-bottom: 72px;
}

/* ---------- prose ---------- */
.prose {
  max-width: calc(var(--w-prose) + var(--gutter) * 2);
  margin: 0 auto;
  padding-inline: var(--gutter);
  font-size: 18px;
  line-height: 1.75;
  letter-spacing: -0.005em;
}
.prose > * + * {
  margin-top: 1.25em;
}
.prose p,
.prose ul,
.prose ol,
.prose blockquote,
.prose pre {
  margin-bottom: 0;
}
.prose h2,
.prose h3,
.prose h4 {
  font-weight: 600;
  letter-spacing: -0.025em;
  line-height: 1.3;
  margin-bottom: 0;
}
.prose h2 {
  font-size: 28px;
  margin-top: 2.4em;
}
.prose h3 {
  font-size: 21px;
  margin-top: 2em;
}
.prose h4 {
  font-size: 18px;
  margin-top: 1.75em;
}
.prose h2 + *,
.prose h3 + *,
.prose h4 + * {
  margin-top: 0.75em;
}
.prose a {
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  text-decoration-color: var(--text-3);
  transition: text-decoration-color 0.15s;
}
.prose a:hover {
  text-decoration-color: currentColor;
}
.prose strong {
  font-weight: 600;
}
.prose ul,
.prose ol {
  padding-left: 1.3em;
}
.prose li + li {
  margin-top: 0.4em;
}
.prose li::marker {
  color: var(--text-3);
}
.prose hr {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 3em 0;
}
.prose blockquote {
  margin-inline: 0;
  padding: 2px 0 2px 20px;
  border-left: 2px solid var(--text);
  color: var(--text-2);
}
.prose blockquote p {
  margin: 0;
}
.prose blockquote p + p {
  margin-top: 0.8em;
}
.prose .tweet {
  margin: 2em auto;
  max-width: 550px;
}
.prose .tweet .twitter-tweet {
  margin: 0 auto !important;
}
/* X's iframe declares no color-scheme; in dark mode a mismatch makes the browser paint
   an opaque white backdrop that shows through its rounded corners. */
.prose .tweet iframe {
  color-scheme: normal;
}
/* fallback card, shown until (or unless) X's widget replaces it */
.prose .tweet blockquote.twitter-tweet {
  padding: 18px 20px;
  border: 1px solid var(--border);
  border-radius: 12px;
  color: var(--text);
  font-size: 16px;
  line-height: 1.6;
}
.prose .tweet blockquote.twitter-tweet footer {
  display: flex;
  flex-wrap: wrap;
  gap: 2px 14px;
  margin-top: 12px;
  font-size: 14px;
  color: var(--text-2);
}
.prose .tweet blockquote.twitter-tweet footer a {
  color: inherit;
}
.prose :not(pre) > code {
  font-family: var(--font-mono);
  font-size: 0.86em;
  padding: 0.15em 0.4em;
  border-radius: 5px;
  background: var(--bg-muted);
}
.prose mark {
  background: var(--mark);
  color: inherit;
  padding: 0 2px;
}
.prose small,
.prose .note {
  font-size: 14px;
  color: var(--text-2);
}
.prose .note {
  padding: 14px 18px;
  border-radius: var(--radius);
  background: var(--bg-soft);
  line-height: 1.6;
}

/* Callouts: <div class="callout"> ... </div> */
.prose .callout {
  padding: 20px 24px;
  border-radius: var(--radius);
  background: var(--bg-soft);
  font-size: 16px;
  line-height: 1.65;
}
.prose .callout > :first-child {
  margin-top: 0;
}
.prose .callout > * + * {
  margin-top: 0.8em;
}
.prose .callout-title {
  display: block;
  font-weight: 600;
  font-size: 14px;
  letter-spacing: 0.02em;
  margin-bottom: 4px;
}

/* Key stats: <div class="stats"><div><strong>94%</strong><span>label</span></div>...</div> */
.prose .stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  margin-top: 2em;
  margin-bottom: 0.5em;
}
.prose .stats > div {
  padding: 22px 20px;
  border-left: 1px solid var(--border);
}
.prose .stats > div:first-child {
  padding-left: 0;
  border-left: 0;
}
.prose .stats strong {
  display: block;
  font-size: 36px;
  font-weight: 600;
  letter-spacing: -0.04em;
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
}
.prose .stats span {
  display: block;
  margin-top: 6px;
  font-size: 14px;
  line-height: 1.45;
  color: var(--text-2);
}

/* ---------- figures ---------- */
.figure,
.chart {
  margin: 2.5em 0;
}
.figure img {
  width: 100%;
  border-radius: var(--radius);
}
figcaption {
  margin-top: 12px;
  font-size: 14px;
  line-height: 1.55;
  color: var(--text-2);
}

.chart {
  padding: 28px 28px 24px;
  border-radius: var(--radius);
  background: var(--bg-soft);
}
.chart-title {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 20px;
  letter-spacing: -0.01em;
}
.bars {
  display: grid;
  gap: 12px;
}
.bar-row {
  display: grid;
  grid-template-columns: minmax(96px, 30%) 1fr 56px;
  align-items: center;
  gap: 14px;
  font-size: 14px;
  line-height: 1.3;
}
.bar-label {
  color: var(--text-2);
}
.bar-track {
  height: 22px;
  border-radius: 4px;
  overflow: hidden;
}
.bar-fill {
  display: block;
  height: 100%;
  width: var(--w);
  border-radius: 4px;
  background: var(--bar);
  transform-origin: left;
  animation: bar-in 0.9s var(--ease) both;
}
.bar-value {
  text-align: right;
  font-variant-numeric: tabular-nums;
  color: var(--text-2);
}
.is-highlight .bar-fill {
  background: var(--bar-hl);
}
.is-highlight .bar-label,
.is-highlight .bar-value {
  color: var(--text);
  font-weight: 600;
}
@keyframes bar-in {
  from {
    transform: scaleX(0);
  }
}
@media (prefers-reduced-motion: reduce) {
  .bar-fill {
    animation: none;
  }
}

.strips {
  display: grid;
  gap: 12px;
}
.strip-row {
  display: grid;
  grid-template-columns: minmax(80px, 22%) 1fr;
  align-items: center;
  gap: 14px;
  font-size: 14px;
  line-height: 1.3;
}
.strip-label {
  color: var(--text-2);
}
.strip-bar {
  display: flex;
  gap: 3px;
}
.strip-part {
  flex-basis: 0;
  min-width: 0;
  padding: 0 6px;
  line-height: 28px;
  border: 1px solid var(--bar);
  border-radius: 4px;
  font-size: 12.5px;
  color: var(--text-2);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.strip-part.is-hit {
  background: var(--bar-hl);
  border-color: var(--bar-hl);
  color: var(--bg);
}
.strip-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 20px;
  margin-top: 18px;
  font-size: 13px;
  color: var(--text-2);
}
.strip-legend span::before {
  content: '';
  display: inline-block;
  width: 12px;
  height: 12px;
  margin-right: 7px;
  vertical-align: -1px;
  border: 1px solid var(--bar);
  border-radius: 3px;
}
.strip-legend .is-hit::before {
  background: var(--bar-hl);
  border-color: var(--bar-hl);
}
@media (max-width: 560px) {
  .strip-row {
    grid-template-columns: 1fr;
    gap: 6px;
  }
  .strip-part {
    padding: 5px;
    font-size: 11.5px;
    line-height: 1.25;
    white-space: normal;
    overflow-wrap: anywhere;
  }
}

/* ---------- tables ---------- */
.table-wrap {
  margin: 2em 0;
  overflow-x: auto;
}
.prose table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
  line-height: 1.5;
  font-variant-numeric: tabular-nums;
}
.prose th,
.prose td {
  padding: 12px 14px 12px 0;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
.prose th {
  text-align: left;
  font-weight: 600;
  font-size: 13px;
  color: var(--text-2);
  border-bottom-color: var(--border-strong);
}
.prose th[align='right'],
.prose td[align='right'] {
  text-align: right;
  padding-right: 0;
  padding-left: 14px;
}
.prose th[align='center'],
.prose td[align='center'] {
  text-align: center;
}

/* ---------- code ---------- */
.code-block {
  position: relative;
  margin: 2em 0;
  border-radius: var(--radius);
  background: var(--code-bg);
  border: 1px solid var(--border);
}
.code-block pre {
  margin: 0;
  padding: 40px 20px 20px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.65;
  tab-size: 4;
}
.code-block code {
  font-family: inherit;
}
.code-lang {
  position: absolute;
  top: 12px;
  left: 20px;
  font-size: 12px;
  color: var(--text-3);
  font-family: var(--font-mono);
}
.code-copy {
  position: absolute;
  top: 8px;
  right: 8px;
  height: 26px;
  padding: 0 10px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--bg);
  color: var(--text-2);
  font: 500 12px var(--font-sans);
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.15s;
}
.code-block:hover .code-copy,
.code-copy:focus-visible {
  opacity: 1;
}
@media (hover: none) {
  .code-copy {
    opacity: 1;
  }
}

.hljs-keyword,
.hljs-selector-tag,
.hljs-built_in,
.hljs-meta .hljs-keyword {
  color: var(--tok-keyword);
}
.hljs-string,
.hljs-regexp,
.hljs-addition {
  color: var(--tok-string);
}
.hljs-number,
.hljs-literal {
  color: var(--tok-number);
}
.hljs-comment,
.hljs-quote,
.hljs-meta {
  color: var(--tok-comment);
}
.hljs-title,
.hljs-section,
.hljs-function .hljs-title,
.hljs-title.function_ {
  color: var(--tok-title);
}
.hljs-attr,
.hljs-attribute,
.hljs-variable,
.hljs-params,
.hljs-type {
  color: var(--tok-attr);
}
.hljs-deletion {
  color: #d1242f;
}

/* ---------- post footer ---------- */
.post-footer {
  margin-top: 72px;
}
.post-info {
  margin: 0;
  border-top: 1px solid var(--border);
}
.post-info > div {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 16px;
  padding: 18px 0;
  border-bottom: 1px solid var(--border);
  font-size: 15px;
  line-height: 1.6;
}
.post-info dt {
  color: var(--text-2);
}
.post-info dd {
  margin: 0;
}
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.tag {
  font-size: 13px;
  padding: 2px 10px;
  border-radius: 999px;
  background: var(--bg-soft);
  color: var(--text-2);
}

.keep-reading {
  margin-top: 120px;
  padding-top: 48px;
  border-top: 1px solid var(--border);
}
.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 32px;
}
.section-head h2 {
  margin: 0;
  font-size: 28px;
  font-weight: 600;
  letter-spacing: -0.03em;
}

.not-found {
  padding: 120px var(--gutter) 80px;
  text-align: center;
}
.not-found h1 {
  margin: 16px 0 0;
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 600;
  letter-spacing: -0.035em;
}

/* ============================================================
   Portfolio
   ============================================================ */
.pf-intro {
  max-width: none;
  margin: 0 0 24px;
  padding: 0;
}
.pf-intro > * {
  max-width: 720px;
}
.pf-group {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  gap: 32px;
  padding-top: 40px;
  margin-top: 40px;
  border-top: 1px solid var(--border);
}
.pf-group:first-child {
  margin-top: 0;
}
.pf-group-title {
  margin: 0;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text-2);
  position: sticky;
  top: calc(var(--header-h) + 24px);
  align-self: start;
}
.pf-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.pf-item {
  padding: 0 0 32px;
}
.pf-item + .pf-item {
  padding-top: 32px;
  border-top: 1px solid var(--border);
}
.pf-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
}
.pf-head h3 {
  margin: 0;
  font-size: 22px;
  line-height: 1.3;
  font-weight: 600;
  letter-spacing: -0.025em;
}
.pf-head h3 a:hover {
  opacity: 0.7;
}
.pf-period {
  flex: none;
  font-size: 14px;
  color: var(--text-2);
  font-variant-numeric: tabular-nums;
}
.pf-role {
  margin: 6px 0 0;
  font-size: 14px;
  color: var(--text-2);
}
.pf-summary {
  margin: 12px 0 0;
  max-width: 680px;
  font-size: 16px;
  line-height: 1.65;
  color: var(--text-2);
}
.pf-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px 24px;
  margin-top: 18px;
}
.pf-links {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 20px;
}
.pf-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 14px;
  font-weight: 500;
}
.pf-link:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}
.pf-back {
  margin-top: 32px;
}

/* ============================================================
   Footer
   ============================================================ */
.site-footer {
  margin-top: 140px;
  border-top: 1px solid var(--border);
  font-size: 14px;
}
.footer-inner {
  max-width: calc(var(--w-page) + var(--gutter) * 2);
  margin: 0 auto;
  padding: 56px var(--gutter) 40px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(2, 1fr);
  gap: 40px;
}
.footer-brand p {
  max-width: 320px;
  margin: 12px 0 0;
  color: var(--text-2);
}
.site-footer h3 {
  margin: 0 0 14px;
  font-size: 14px;
  font-weight: 600;
}
.site-footer ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}
.site-footer li a {
  color: var(--text-2);
}
.site-footer li a:hover {
  color: var(--text);
}
.footer-bottom {
  margin-top: 56px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  color: var(--text-3);
  font-size: 13px;
}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 1024px) {
  .grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .featured {
    gap: 32px;
  }
}

@media (max-width: 860px) {
  .pf-group {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .pf-group-title {
    position: static;
  }
  .header-inner {
    gap: 16px;
  }
  .menu-toggle {
    display: inline-flex;
  }
  .nav {
    /* The header's backdrop-filter makes it the containing block for this fixed panel,
       so bottom: 0 would end at the header. Size the panel against the viewport instead. */
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    height: calc(100vh - var(--header-h));
    height: calc(100dvh - var(--header-h));
    overflow-y: auto;
    flex-direction: column;
    gap: 0;
    padding: 8px var(--gutter);
    background: var(--bg);
    font-size: 22px;
    font-weight: 500;
    color: var(--text);
    letter-spacing: -0.02em;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity 0.2s, transform 0.2s var(--ease), visibility 0.2s;
  }
  .nav a {
    padding: 14px 0;
    border-bottom: 1px solid var(--border);
  }
  body.nav-open {
    overflow: hidden;
  }
  body.nav-open .site-header {
    background: var(--bg);
  }
  body.nav-open .nav {
    opacity: 1;
    visibility: visible;
    transform: none;
  }
  .featured {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 600px) {
  :root {
    --gutter: 16px;
  }
  .hide-sm {
    display: none;
  }
  .brand-sub {
    display: none;
  }
  .lang-full {
    display: none;
  }
  .pf-head {
    flex-direction: column;
    gap: 4px;
  }
  .pf-head h3 {
    font-size: 20px;
  }
  .lang-short {
    display: inline;
  }
  .grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .index-hero {
    padding-top: 48px;
  }
  .post-header {
    padding-top: 56px;
    padding-bottom: 40px;
  }
  .post-summary {
    font-size: 17px;
  }
  .post-hero {
    margin-bottom: 48px;
    padding-inline: 0;
  }
  .post-hero .cover {
    border-radius: 0;
  }
  .prose {
    font-size: 17px;
  }
  .prose h2 {
    font-size: 24px;
  }
  .chart {
    padding: 20px 16px;
    margin-inline: calc(var(--gutter) * -1);
    border-radius: 0;
  }
  .bar-row {
    grid-template-columns: 1fr 52px;
    gap: 4px 10px;
  }
  .bar-label {
    grid-column: 1 / -1;
  }
  .post-info > div {
    grid-template-columns: 88px 1fr;
  }
  .prose .stats {
    grid-template-columns: 1fr;
  }
  .prose .stats > div {
    padding: 18px 0;
    border-left: 0;
  }
  .prose .stats > div + div {
    border-top: 1px solid var(--border);
  }
  .site-footer {
    margin-top: 96px;
  }
}