/* ==========================================================================
   CatalyzeIN — Dusk Murmuration design system
   ========================================================================== */

/* ---------- Tokens ---------- */
:root {
  /* uchū palette (https://uchu.style) — bright + pastel */
  --uchu-pink-1: oklch(0.958 0.023 354.27);
  --uchu-pink-3: oklch(0.889 0.066 354.39);
  --uchu-pink-5: oklch(0.8223 0.112 355.33);
  --uchu-pink-7: oklch(0.7023 0.092 354.96);
  --uchu-purple-1: oklch(0.891 0.046 305.24);
  --uchu-purple-2: oklch(0.7868 0.091 305);
  --uchu-purple-3: oklch(0.685 0.136 303.78);
  --uchu-purple-5: oklch(0.4939 0.215 298.31);
  --uchu-blue-1: oklch(0.8966 0.046 260.67);
  --uchu-blue-2: oklch(0.8017 0.091 258.88);
  --uchu-blue-3: oklch(0.7094 0.136 258.06);
  --uchu-blue-5: oklch(0.5487 0.222 260.33);
  --uchu-blue-7: oklch(0.4736 0.185 259.89);
  --uchu-green-1: oklch(0.9396 0.05 148.74);
  --uchu-green-4: oklch(0.7933 0.179 145.62);
  --uchu-green-7: oklch(0.6424 0.175 144.92);
  --uchu-yellow-1: oklch(0.9705 0.039 91.2);
  --uchu-yellow-4: oklch(0.9092 0.125 92.56);
  --uchu-yellow-7: oklch(0.7584 0.122 92.21);
  --uchu-orange-3: oklch(0.8356 0.107 56.49);
  --uchu-orange-5: oklch(0.7461 0.171 51.56);
  --uchu-orange-7: oklch(0.638 0.142 52.1);
  --uchu-yin-5: oklch(0.6101 0.005 271.34);
  --uchu-yin-6: oklch(0.5279 0.005 271.32);
  --uchu-yin-8: oklch(0.3502 0.005 236.66);
  --uchu-yin-9: oklch(0.2511 0.006 258.36);

  /* deep inks (kept for dark mode + footer) */
  --ink-950: oklch(0.205 0.012 270);
  --ink-900: var(--uchu-yin-9);
  --ink-800: oklch(0.3 0.014 270);

  /* Semantic — light theme */
  --bg: oklch(0.988 0.006 91);
  --bg-alt: oklch(0.9705 0.022 91.2);
  --bg-card: #ffffff;
  --text: var(--uchu-yin-9);
  --text-soft: var(--uchu-yin-6);
  --text-faint: var(--uchu-yin-5);
  --line: oklch(0.2511 0.006 258.36 / 0.12);
  --accent: var(--uchu-blue-5);
  --accent-strong: var(--uchu-purple-5);
  --shadow: 0 2px 6px oklch(0.4 0.05 280 / 0.06), 0 16px 40px -18px oklch(0.4 0.08 280 / 0.25);
  --shadow-lift: 0 4px 12px oklch(0.4 0.05 280 / 0.08), 0 28px 56px -20px oklch(0.4 0.08 280 / 0.35);

  /* morning sky + flight gradients (names kept from v1 for stability) */
  --grad-dusk: linear-gradient(165deg, var(--uchu-pink-1) 0%, var(--uchu-purple-1) 48%, var(--uchu-blue-1) 100%);
  --grad-ember: linear-gradient(120deg, var(--uchu-blue-5) 0%, var(--uchu-purple-3) 55%, var(--uchu-pink-5) 100%);

  /* text colors on hero/sky surfaces */
  --hero-ink: var(--uchu-yin-9);
  --hero-ink-soft: oklch(0.2511 0.006 258.36 / 0.78);
  --hero-ink-faint: oklch(0.2511 0.006 258.36 / 0.5);
  --hero-accent: var(--uchu-blue-7);

  /* Type */
  --font-display: "Playfair Display", Georgia, serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", monospace;

  --step--1: clamp(0.83rem, 0.8rem + 0.15vw, 0.92rem);
  --step-0: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --step-1: clamp(1.2rem, 1.1rem + 0.5vw, 1.45rem);
  --step-2: clamp(1.5rem, 1.3rem + 1vw, 2rem);
  --step-3: clamp(1.9rem, 1.5rem + 1.8vw, 2.8rem);
  --step-4: clamp(2.4rem, 1.8rem + 3.2vw, 4.2rem);
  --step-5: clamp(3rem, 2rem + 5vw, 5.6rem);

  --radius: 14px;
  --radius-lg: 22px;
  --container: 1180px;
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
}

.dark-mode {
  --bg: var(--ink-900);
  --bg-alt: var(--ink-950);
  --bg-card: var(--ink-800);
  --text: #eceaf5;
  --text-soft: #b3b2ca;
  --text-faint: #82819e;
  --line: rgba(236, 234, 245, 0.13);
  --accent: var(--uchu-blue-2);
  --accent-strong: var(--uchu-pink-3);
  --grad-dusk: linear-gradient(165deg, oklch(0.42 0.05 350) 0%, oklch(0.36 0.06 300) 48%, oklch(0.34 0.07 262) 100%);
  --hero-ink: #f4f2fa;
  --hero-ink-soft: rgba(244, 242, 250, 0.8);
  --hero-ink-faint: rgba(244, 242, 250, 0.5);
  --hero-accent: var(--uchu-pink-3);
  --shadow: 0 2px 6px rgba(0, 0, 0, 0.3), 0 16px 40px -18px rgba(0, 0, 0, 0.6);
  --shadow-lift: 0 4px 12px rgba(0, 0, 0, 0.35), 0 28px 56px -20px rgba(0, 0, 0, 0.7);
}

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

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: var(--step-0);
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.35s ease, color 0.35s ease;
}

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

h1, h2, h3, h4 {
  font-family: var(--font-display);
  line-height: 1.15;
  margin: 0 0 0.6em;
  color: var(--text);
  text-wrap: balance;
}

h1 { font-size: var(--step-4); font-weight: 700; }
h2 { font-size: var(--step-3); font-weight: 700; }
h3 { font-size: var(--step-1); font-weight: 600; }

p { margin: 0 0 1.2em; }

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-strong); }

::selection { background: var(--uchu-yellow-4); color: var(--uchu-yin-9); }

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 clamp(1.25rem, 4vw, 2.5rem);
}

/* Kickers & section titles */
.kicker {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  margin: 0 0 1.1rem;
}
.kicker::before {
  content: "";
  width: 2.2rem;
  height: 1px;
  background: var(--grad-ember);
}

.section-title { margin-bottom: 0.4em; }

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin-bottom: clamp(1.8rem, 4vw, 3rem);
}
.section-head .section-title { margin-bottom: 0; }

.view-all {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  white-space: nowrap;
}
.view-all svg { width: 1em; height: 1em; transition: transform 0.25s var(--ease-out); }
.view-all:hover svg { transform: translateX(4px); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.85rem 1.7rem;
  border-radius: 999px;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  cursor: pointer;
  border: 1.5px solid transparent;
  transition: transform 0.25s var(--ease-out), box-shadow 0.25s var(--ease-out), background-color 0.25s, color 0.25s, border-color 0.25s;
}
.btn svg { width: 1.05em; height: 1.05em; }

.btn-primary {
  background: var(--grad-ember);
  color: #ffffff;
  box-shadow: 0 10px 28px -10px oklch(0.5487 0.222 260.33 / 0.55);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 36px -10px oklch(0.5487 0.222 260.33 / 0.7);
  color: #ffffff;
}

.btn-ghost {
  border-color: currentColor;
  color: var(--text);
  background: transparent;
}
.btn-ghost:hover { transform: translateY(-2px); color: var(--accent); }

.hero .btn-ghost { color: var(--hero-ink); }
.hero .btn-ghost:hover { color: var(--hero-accent); border-color: var(--hero-accent); }

/* ---------- Header ---------- */
.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  transition: background-color 0.35s ease, box-shadow 0.35s ease, backdrop-filter 0.35s ease;
}
.site-header nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.5rem;
}
.site-header.scrolled {
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  box-shadow: 0 1px 0 var(--line);
}

.site-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.35rem;
  color: var(--text);
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
}
.site-title svg { width: 2.1rem; height: 1.6rem; flex-shrink: 0; }
.site-title:hover { color: var(--text); }

/* over the pastel hero, header text uses adaptive hero ink until scrolled */
body.has-dark-hero .site-header:not(.scrolled) .site-title,
body.has-dark-hero .site-header:not(.scrolled) .nav-links a { color: var(--hero-ink); }
body.has-dark-hero .site-header:not(.scrolled) .nav-toggle span { background: var(--hero-ink); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav-links a {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-soft);
  position: relative;
}
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -5px;
  width: 100%;
  height: 2px;
  background: var(--grad-ember);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s var(--ease-out);
}
.nav-links a:hover { color: var(--text); }
.nav-links a:hover::after { transform: scaleX(1); }

.nav-toggle { display: none; cursor: pointer; padding: 0.5rem; }
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  margin: 5px 0;
  border-radius: 2px;
  transition: transform 0.3s var(--ease-out), opacity 0.3s;
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

@media (max-width: 720px) {
  .nav-toggle { display: block; }
  .nav-links {
    position: fixed;
    top: 4.5rem;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--line);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s var(--ease-out);
  }
  .nav-links.open { max-height: 16rem; }
  .nav-links li { width: 100%; text-align: center; }
  .nav-links a { display: block; padding: 1rem; color: var(--text); }
  .nav-links a::after { display: none; }
  body.has-dark-hero .site-header:not(.scrolled) .nav-links.open a { color: var(--text); }
}

/* Reading progress */
.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0;
  background: var(--grad-ember);
  z-index: 110;
}

/* ---------- Hero (dusk murmuration) ---------- */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  background: var(--grad-dusk);
  color: var(--hero-ink);
  overflow: hidden;
  isolation: isolate;
}

#flock-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
}

/* soft sunrise glow at the base of the morning sky */
.hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0;
  height: 45%;
  background: radial-gradient(120% 90% at 50% 115%, oklch(0.9705 0.039 91.2 / 0.85), oklch(0.9396 0.05 148.74 / 0.25) 50%, transparent 75%);
  z-index: 1;
  pointer-events: none;
}

.hero-inner {
  position: relative;
  z-index: 2;
  width: 100%;
  padding-top: 6.5rem;
  padding-bottom: 5rem;
  pointer-events: none;
}
.hero-inner a, .hero-inner .btn { pointer-events: auto; }

.hero-content { max-width: 44rem; }

.hero .kicker { color: var(--hero-accent); }

.hero h1 {
  font-size: var(--step-5);
  color: var(--hero-ink);
  margin-bottom: 0.45em;
  letter-spacing: -0.01em;
}
.hero h1 em {
  font-style: italic;
  background: var(--grad-ember);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-lede {
  font-size: var(--step-1);
  line-height: 1.55;
  color: var(--hero-ink-soft);
  max-width: 36rem;
  margin-bottom: 2.2rem;
}

.hero-actions { display: flex; gap: 1rem; flex-wrap: wrap; }

.hero-foot {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 1.6rem;
  z-index: 2;
  pointer-events: none;
}
.hero-foot .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.hero-note {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--hero-ink-faint);
}
.scroll-cue {
  width: 2.4rem;
  height: 2.4rem;
  display: grid;
  place-items: center;
  color: var(--hero-ink-faint);
  animation: drift-down 2.4s ease-in-out infinite;
}
.scroll-cue svg { width: 1.2rem; height: 1.2rem; }
@keyframes drift-down {
  0%, 100% { transform: translateY(0); opacity: 0.6; }
  50% { transform: translateY(7px); opacity: 1; }
}

/* ---------- Sections ---------- */
section { padding: clamp(3.5rem, 9vw, 7rem) 0; }
.section-alt { background: var(--bg-alt); }

/* Category cards */
.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: clamp(1.2rem, 2.5vw, 2rem);
}

.category-card {
  position: relative;
  display: block;
  padding: 2.2rem 1.9rem;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  color: var(--text);
  overflow: hidden;
  transition: transform 0.35s var(--ease-out), box-shadow 0.35s var(--ease-out), border-color 0.35s;
}
.category-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 4px;
  background: var(--card-accent, var(--grad-ember));
}
.category-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lift);
  border-color: transparent;
  color: var(--text);
}

.card-movement { --card-accent: linear-gradient(90deg, var(--uchu-blue-5), var(--uchu-blue-2)); --card-tint: var(--uchu-blue-5); }
.card-catalyst { --card-accent: linear-gradient(90deg, var(--uchu-orange-5), var(--uchu-yellow-4)); --card-tint: var(--uchu-orange-5); }
.card-decolonization { --card-accent: linear-gradient(90deg, var(--uchu-green-7), var(--uchu-green-4)); --card-tint: var(--uchu-green-7); }

.card-icon {
  width: 3.4rem;
  height: 3.4rem;
  border-radius: 14px;
  display: grid;
  place-items: center;
  margin-bottom: 1.4rem;
  color: var(--card-tint, var(--accent));
  background: color-mix(in srgb, var(--card-tint, var(--accent)) 13%, transparent);
  transition: transform 0.35s var(--ease-out);
}
.card-icon svg { width: 1.7rem; height: 1.7rem; }
.category-card:hover .card-icon { transform: scale(1.08) rotate(-4deg); }

.category-card h3 { margin-bottom: 0.45rem; }
.category-card p { color: var(--text-soft); font-size: 0.95rem; margin-bottom: 1.3rem; }

.card-link {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--card-tint, var(--accent));
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}
.card-link svg { width: 0.95em; height: 0.95em; transition: transform 0.25s var(--ease-out); }
.category-card:hover .card-link svg { transform: translateX(4px); }

/* Article cards */
.article-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: clamp(1.2rem, 2.5vw, 2rem);
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform 0.35s var(--ease-out), box-shadow 0.35s var(--ease-out);
}
.article-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lift); }
.article-card > a { display: flex; flex-direction: column; height: 100%; color: var(--text); }

.article-image { aspect-ratio: 16 / 9; overflow: hidden; }
.article-image img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.6s var(--ease-out); }
.article-card:hover .article-image img { transform: scale(1.05); }

.image-placeholder { width: 100%; height: 100%; position: relative; }
.image-placeholder::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(255, 255, 255, 0.32) 1.1px, transparent 1.3px);
  background-size: 17px 17px;
  -webkit-mask-image: linear-gradient(120deg, transparent 30%, #000);
  mask-image: linear-gradient(120deg, transparent 30%, #000);
}
.bg-gradient-0 { background: linear-gradient(135deg, var(--uchu-blue-3), var(--uchu-purple-2)); }
.bg-gradient-1 { background: linear-gradient(135deg, var(--uchu-orange-3), var(--uchu-pink-3)); }
.bg-gradient-2 { background: linear-gradient(135deg, var(--uchu-green-4), var(--uchu-blue-2)); }
.bg-gradient-3 { background: linear-gradient(135deg, var(--uchu-pink-5), var(--uchu-purple-2)); }

.article-content { padding: 1.5rem 1.6rem 1.7rem; display: flex; flex-direction: column; gap: 0.55rem; flex: 1; }

.article-meta {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--text-faint);
}
.article-tag {
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-weight: 500;
}
.article-content h3 { margin: 0; font-size: 1.25rem; }
.article-content p { color: var(--text-soft); font-size: 0.93rem; margin: 0; }

/* Compact list */
.compact-list { display: flex; flex-direction: column; }
.list-item {
  display: grid;
  grid-template-columns: 9.5rem 1fr auto;
  gap: 1.5rem;
  align-items: baseline;
  padding: 1.15rem 0.5rem;
  border-bottom: 1px solid var(--line);
  color: var(--text);
  transition: background-color 0.25s, padding-left 0.3s var(--ease-out);
  border-radius: 8px;
}
.list-item:hover { background: color-mix(in srgb, var(--accent) 6%, transparent); padding-left: 1rem; color: var(--text); }
.item-date { font-family: var(--font-mono); font-size: 0.75rem; color: var(--text-faint); }
.item-title { font-family: var(--font-display); font-size: 1.15rem; font-weight: 600; }
.item-category {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent);
}
@media (max-width: 640px) {
  .list-item { grid-template-columns: 1fr; gap: 0.25rem; }
}

/* ---------- Page hero (inner pages) ---------- */
.page-hero {
  background: var(--grad-dusk);
  color: var(--hero-ink);
  padding: clamp(7rem, 16vh, 10rem) 0 clamp(2.8rem, 6vw, 4.5rem);
  position: relative;
  overflow: hidden;
}
.page-hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0;
  height: 60%;
  background: radial-gradient(110% 100% at 50% 120%, oklch(0.9705 0.039 91.2 / 0.55), transparent 70%);
  pointer-events: none;
}
.page-hero .container { position: relative; z-index: 1; }
.page-hero h1 { color: var(--hero-ink); margin-bottom: 0.25em; }
.page-hero .kicker { color: var(--hero-accent); }
.page-hero p { color: var(--hero-ink-soft); max-width: 40rem; margin-bottom: 0; }

/* ---------- Filters ---------- */
.category-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-bottom: clamp(2rem, 4vw, 3rem);
}
.filter-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.55rem 1.15rem;
  border-radius: 999px;
  border: 1.5px solid var(--line);
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-soft);
  transition: all 0.25s var(--ease-out);
}
.filter-btn .btn-icon svg { width: 1rem; height: 1rem; display: block; }
.filter-btn:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-1px); }
.filter-btn.active {
  background: var(--grad-ember);
  border-color: transparent;
  color: #ffffff;
}

/* ---------- Post ---------- */
.post-hero { padding-bottom: clamp(2.4rem, 5vw, 4rem); }
.post-hero .post-title { font-size: var(--step-4); max-width: 19ch; }

.post-categories { display: flex; gap: 0.6rem; margin-bottom: 1.3rem; flex-wrap: wrap; }
.category-badge {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 0.35rem 0.85rem;
  border-radius: 999px;
  border: 1px solid color-mix(in srgb, var(--card-tint, var(--accent)) 55%, transparent);
  color: var(--card-tint, var(--accent));
  background: color-mix(in srgb, var(--card-tint, var(--accent)) 14%, #ffffff60);
}

.post-description {
  font-size: var(--step-1);
  line-height: 1.5;
  font-family: var(--font-display);
  font-style: italic;
}

.post-meta {
  display: flex;
  align-items: center;
  gap: 1.4rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--hero-ink-soft);
  margin-top: 1.6rem;
  flex-wrap: wrap;
}
.post-meta .meta-item { display: inline-flex; align-items: center; gap: 0.45rem; }
.post-meta svg { width: 1rem; height: 1rem; opacity: 0.8; }

.post-body { padding: clamp(3rem, 7vw, 5rem) 0 0; }
.post-content {
  max-width: 44rem;
  margin: 0 auto;
  font-size: clamp(1.04rem, 1rem + 0.3vw, 1.18rem);
  line-height: 1.85;
}
.post-content h2, .post-content h3 { margin-top: 2em; }
.post-content h2 { font-size: var(--step-2); }
.post-content img { border-radius: var(--radius); margin: 2rem auto; }
.post-content blockquote {
  margin: 2.2rem 0;
  padding: 0.4rem 0 0.4rem 1.6rem;
  border-left: 3px solid var(--uchu-pink-5);
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1.18em;
  color: var(--text-soft);
}
.post-content code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--bg-alt);
  padding: 0.15em 0.4em;
  border-radius: 6px;
}
.post-content pre { background: var(--ink-900); color: #eceaf5; padding: 1.4rem; border-radius: var(--radius); overflow-x: auto; }
.post-content pre code { background: none; padding: 0; }
.post-content hr { border: none; height: 1px; background: var(--line); margin: 3rem 0; }
.post-content ul li, .post-content ol li { margin-bottom: 0.5em; }
.post-content a { text-decoration: underline; text-decoration-color: color-mix(in srgb, var(--accent) 45%, transparent); text-underline-offset: 3px; }

/* Post extras */
.post-extras { max-width: 44rem; margin: 0 auto; padding-bottom: clamp(3rem, 7vw, 5rem); }

.post-end-cta {
  margin-top: 3.5rem;
  padding: 2.4rem 2rem;
  text-align: center;
  border-radius: var(--radius-lg);
  background: var(--grad-dusk);
  color: var(--hero-ink);
  position: relative;
  overflow: hidden;
}
.post-end-cta::after {
  content: "";
  position: absolute;
  inset: auto 0 0;
  height: 70%;
  background: radial-gradient(110% 100% at 50% 130%, oklch(0.9705 0.039 91.2 / 0.5), transparent 70%);
  pointer-events: none;
}
.post-end-cta > * { position: relative; z-index: 1; }
.post-end-cta h3 { color: var(--hero-ink); }
.post-end-cta p { color: var(--hero-ink-soft); font-size: 0.95rem; }

.post-navigation {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 2.5rem;
}
.post-navigation .nav-link {
  padding: 1.3rem 1.4rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--text);
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  transition: border-color 0.25s, transform 0.25s var(--ease-out), box-shadow 0.25s;
}
.post-navigation .nav-link:hover { border-color: var(--accent); transform: translateY(-3px); box-shadow: var(--shadow); }
.post-navigation .nav-next { text-align: right; grid-column: 2; }
.post-navigation .nav-prev { grid-column: 1; }
.nav-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-faint);
}
.nav-title { font-family: var(--font-display); font-weight: 600; font-size: 1.02rem; }
@media (max-width: 560px) {
  .post-navigation { grid-template-columns: 1fr; }
  .post-navigation .nav-next { grid-column: 1; text-align: left; }
}

.related-articles { margin-top: 3rem; }
.related-articles-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
@media (max-width: 560px) { .related-articles-grid { grid-template-columns: 1fr; } }
.related-article-card {
  padding: 1.4rem 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--text);
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  transition: transform 0.25s var(--ease-out), box-shadow 0.25s;
}
.related-article-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); color: var(--text); }
.related-article-card h4 { margin: 0; font-size: 1.05rem; }
.related-article-card p { margin: 0; font-size: 0.88rem; color: var(--text-soft); }
.related-article-card .meta { font-family: var(--font-mono); font-size: 0.72rem; color: var(--text-faint); }

/* ---------- About ---------- */
.about-body { max-width: 46rem; margin: 0 auto; }
.about-body h2 { font-size: var(--step-2); margin-top: 1.8em; }

.about-values {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.2rem;
  margin: 2.5rem 0;
}
.about-value {
  padding: 1.8rem 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  text-align: center;
}
.about-value .value-icon {
  width: 3rem;
  height: 3rem;
  margin: 0 auto 1rem;
  border-radius: 12px;
  display: grid;
  place-items: center;
  color: var(--card-tint, var(--accent));
  background: color-mix(in srgb, var(--card-tint, var(--accent)) 13%, transparent);
}
.about-value .value-icon svg { width: 1.5rem; height: 1.5rem; }
.about-value h3 { font-size: 1.1rem; margin-bottom: 0.4rem; }
.about-value p { font-size: 0.88rem; color: var(--text-soft); margin: 0; }

.about-cta { text-align: center; margin-top: 3rem; }

/* ---------- 404 ---------- */
.error-hero {
  min-height: 100svh;
  display: flex;
  align-items: center;
  text-align: center;
  background: var(--grad-dusk);
  color: var(--hero-ink);
  position: relative;
  overflow: hidden;
}
.error-hero .container { position: relative; z-index: 2; width: 100%; }
.error-hero h1 {
  font-size: clamp(6rem, 20vw, 12rem);
  color: transparent;
  background: var(--grad-ember);
  -webkit-background-clip: text;
  background-clip: text;
  margin-bottom: 0.1em;
}
.error-hero .tagline { font-family: var(--font-display); font-style: italic; font-size: var(--step-1); color: var(--hero-ink-soft); margin-bottom: 2rem; }

/* ---------- Footer ---------- */
.site-footer {
  background: var(--ink-950);
  color: #b3b2ca;
  padding: clamp(3rem, 6vw, 4.5rem) 0 2rem;
  position: relative;
  overflow: hidden;
}
.site-footer::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 3px;
  background: var(--grad-ember);
}
.footer-grid {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 2rem;
  flex-wrap: wrap;
  margin-bottom: 2.5rem;
}
.footer-brand { max-width: 22rem; }
.footer-brand .site-title { color: #faf6ec; font-size: 1.5rem; margin-bottom: 0.8rem; }
.footer-brand p { font-size: 0.9rem; color: #82819e; margin: 0; }

.footer-links { list-style: none; margin: 0; padding: 0; display: flex; gap: 1.8rem; flex-wrap: wrap; }
.footer-links a { color: #b3b2ca; font-size: 0.92rem; }
.footer-links a:hover { color: var(--uchu-pink-3); }

.footer-meta {
  border-top: 1px solid rgba(236, 234, 245, 0.1);
  padding-top: 1.6rem;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: #5f5e78;
}

/* ---------- Floating controls ---------- */
.theme-toggle, .back-to-top {
  position: fixed;
  right: 1.4rem;
  width: 2.9rem;
  height: 2.9rem;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: var(--bg-card);
  color: var(--text);
  cursor: pointer;
  display: grid;
  place-items: center;
  box-shadow: var(--shadow);
  z-index: 90;
  transition: transform 0.25s var(--ease-out), opacity 0.3s, visibility 0.3s;
}
.theme-toggle { bottom: 1.4rem; }
.theme-toggle:hover, .back-to-top:hover { transform: translateY(-3px); }
.theme-toggle svg, .back-to-top svg { width: 1.2rem; height: 1.2rem; }

.theme-toggle .icon-sun { display: none; }
.dark-mode .theme-toggle .icon-sun { display: block; }
.dark-mode .theme-toggle .icon-moon { display: none; }

.back-to-top { bottom: 5rem; opacity: 0; visibility: hidden; }
.back-to-top.visible { opacity: 1; visibility: visible; }

/* ---------- Motion ---------- */
.fade-in { opacity: 0; transform: translateY(22px); transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out); }
.fade-in.visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
  .fade-in { opacity: 1; transform: none; }
}