:root {
  --black: #080c14;
  --dark-navy: #0d1420;
  --navy: #192231;
  --purple-dark: #653a92;
  --purple-mid: #7966a2;
  --purple-light: #9b8fbe;
  --gray-orange: #BB8575;
  --cream: #F7F5F2;
  --white: #ffffff;

  --text-primary: rgba(255, 255, 255, 0.92);
  --text-secondary: rgba(255, 255, 255, 0.62);
  --text-muted: rgba(255, 255, 255, 0.42);
  --text-faint: rgba(255, 255, 255, 0.22);

  --border-soft: rgba(255, 255, 255, 0.06);
  --border-mid: rgba(255, 255, 255, 0.10);
  --border-strong: rgba(255, 255, 255, 0.18);

  --surface-1: rgba(255, 255, 255, 0.025);
  --surface-2: rgba(255, 255, 255, 0.045);
  --surface-3: rgba(255, 255, 255, 0.07);

  --max: 1200px;
  --content-max: 880px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html, body {
  background: var(--black);
  color: var(--text-primary);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-weight: 400;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  min-height: 100vh;
  background-image:
    radial-gradient(circle at 12% 8%, rgba(101, 58, 146, 0.18) 0%, transparent 35%),
    radial-gradient(circle at 92% 18%, rgba(187, 133, 117, 0.10) 0%, transparent 40%);
  background-attachment: fixed;
}

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

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

::selection { background: rgba(101, 58, 146, 0.55); color: #fff; }

/* ── Top nav ── */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(8, 12, 20, 0.82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-soft);
}
.nav-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 16px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.nav-brand {
  display: flex;
  align-items: center;
  gap: 14px;
}
.nav-brand img {
  height: 28px;
  width: auto;
}
.nav-brand-divider {
  width: 1px;
  height: 18px;
  background: var(--border-mid);
}
.nav-brand-tag {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--gray-orange);
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
}
.nav-links a {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  letter-spacing: 0.02em;
  transition: color 0.18s;
}
.nav-links a:hover { color: var(--white); }
.nav-links a.active { color: var(--white); }

/* ── Hero ── */
.hero {
  position: relative;
  padding: 88px 32px 64px;
  border-bottom: 1px solid var(--border-soft);
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.025) 1px, transparent 1px);
  background-size: 56px 56px;
  pointer-events: none;
  mask-image: radial-gradient(circle at 50% 30%, black 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(circle at 50% 30%, black 30%, transparent 75%);
}
.hero-inner {
  max-width: var(--max);
  margin: 0 auto;
  position: relative;
  z-index: 1;
}
.hero-eyebrow {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--gray-orange);
  margin-bottom: 18px;
  display: inline-flex;
  align-items: center;
  gap: 12px;
}
.hero-eyebrow::before {
  content: '';
  width: 28px;
  height: 1px;
  background: var(--gray-orange);
}
.hero-title {
  font-size: clamp(40px, 5.4vw, 68px);
  font-weight: 900;
  line-height: 1.02;
  letter-spacing: -0.035em;
  color: var(--white);
  max-width: 880px;
  margin-bottom: 22px;
}
.hero-title em {
  font-style: normal;
  background: linear-gradient(90deg, var(--purple-mid), var(--gray-orange));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-sub {
  font-size: 17px;
  font-weight: 400;
  color: var(--text-secondary);
  max-width: 640px;
  line-height: 1.65;
  margin-bottom: 36px;
}
.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 28px;
  padding: 18px 0;
  border-top: 1px solid var(--border-soft);
  border-bottom: 1px solid var(--border-soft);
  max-width: 720px;
}
.hero-meta-item .label {
  display: block;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-bottom: 6px;
}
.hero-meta-item .value {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
}

/* ── Login page ── */
.login-body {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 32px 20px;
  position: relative;
  overflow: hidden;
}
.login-body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(circle at 50% 40%, black 0%, transparent 75%);
  -webkit-mask-image: radial-gradient(circle at 50% 40%, black 0%, transparent 75%);
  pointer-events: none;
  z-index: 0;
}
.login-shell {
  width: 100%;
  max-width: 460px;
  z-index: 1;
}
.login-card {
  position: relative;
  background: linear-gradient(180deg, var(--dark-navy) 0%, rgba(13, 20, 32, 0.85) 100%);
  border: 1px solid var(--border-mid);
  border-radius: 22px;
  padding: 44px 40px 32px;
  box-shadow:
    0 32px 80px rgba(0, 0, 0, 0.55),
    0 0 0 1px rgba(101, 58, 146, 0.12),
    inset 0 1px 0 rgba(255, 255, 255, 0.04);
  isolation: isolate;
  overflow: hidden;
  animation: loginIn 0.7s cubic-bezier(0.4, 0, 0.2, 1) both;
}
@keyframes loginIn {
  from { opacity: 0; transform: translateY(20px) scale(0.98); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}
.login-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--purple-mid), var(--gray-orange), var(--purple-mid), transparent);
  background-size: 200% 100%;
  animation: shimmer 7s linear infinite;
}
@keyframes shimmer {
  0% { background-position: 0% 0%; }
  100% { background-position: 200% 0%; }
}
.login-orb {
  position: absolute;
  width: 280px;
  height: 280px;
  top: -120px;
  right: -120px;
  background: radial-gradient(circle, rgba(101, 58, 146, 0.45) 0%, transparent 70%);
  filter: blur(20px);
  z-index: -1;
  animation: orbDrift 12s ease-in-out infinite alternate;
}
@keyframes orbDrift {
  0% { transform: translate(0, 0); }
  100% { transform: translate(-30px, 30px); }
}
.login-brand {
  display: flex;
  justify-content: flex-start;
  margin-bottom: 32px;
}
.login-logo {
  height: 28px;
  width: auto;
  opacity: 0.95;
}
.login-eyebrow {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--gray-orange);
  margin-bottom: 14px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.login-eyebrow::before {
  content: '';
  width: 22px;
  height: 1px;
  background: var(--gray-orange);
}
.login-title {
  font-size: 38px;
  font-weight: 900;
  letter-spacing: -0.035em;
  color: var(--white);
  line-height: 1;
  margin-bottom: 12px;
}
.login-title em {
  font-style: normal;
  background: linear-gradient(90deg, var(--purple-mid), var(--gray-orange));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.login-sub {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 28px;
}
.login-form {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.login-label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-bottom: -4px;
}
.login-input-wrap {
  position: relative;
}
.login-input {
  width: 100%;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-mid);
  border-radius: 11px;
  color: var(--white);
  font-family: inherit;
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.02em;
  padding: 14px 16px;
  outline: none;
  transition: border-color 0.18s, background 0.18s, box-shadow 0.18s;
}
.login-input::placeholder { color: var(--text-muted); }
.login-input:hover { border-color: var(--border-strong); }
.login-input:focus {
  border-color: var(--purple-mid);
  background: rgba(255, 255, 255, 0.05);
  box-shadow: 0 0 0 4px rgba(101, 58, 146, 0.18);
}
.login-submit {
  appearance: none;
  cursor: pointer;
  border: 0;
  font-family: inherit;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--white);
  padding: 14px 20px;
  border-radius: 11px;
  background: linear-gradient(135deg, var(--purple-dark), var(--purple-mid));
  box-shadow: 0 10px 32px rgba(101, 58, 146, 0.42);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-top: 4px;
  transition: transform 0.18s, box-shadow 0.18s, opacity 0.18s;
}
.login-submit:hover {
  transform: translateY(-1px);
  box-shadow: 0 14px 40px rgba(101, 58, 146, 0.55);
}
.login-submit:active { transform: translateY(0); }
.login-submit:disabled {
  opacity: 0.65;
  cursor: progress;
  transform: none;
}
.login-submit svg {
  width: 14px;
  height: 14px;
  transition: transform 0.18s;
}
.login-submit:hover svg { transform: translateX(3px); }
.login-error {
  font-size: 12.5px;
  font-weight: 500;
  color: #d97a6c;
  min-height: 18px;
  letter-spacing: 0.01em;
}
.login-foot {
  margin-top: 28px;
  padding-top: 18px;
  border-top: 1px solid var(--border-soft);
  display: flex;
  justify-content: space-between;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-faint);
}

@media (max-width: 480px) {
  .login-card { padding: 36px 28px 26px; border-radius: 18px; }
  .login-title { font-size: 32px; }
}

/* ── Filter pill bar ── */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding: 0 0 32px;
  border-bottom: 1px solid var(--border-soft);
  margin-bottom: 40px;
}
.filter-pill {
  appearance: none;
  background: var(--surface-1);
  color: var(--text-secondary);
  border: 1px solid var(--border-mid);
  padding: 9px 18px;
  border-radius: 999px;
  font-family: inherit;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  cursor: pointer;
  transition: color 0.18s, background 0.18s, border-color 0.18s, transform 0.12s;
}
.filter-pill:hover {
  color: var(--white);
  border-color: var(--border-strong);
  background: var(--surface-2);
}
.filter-pill:active { transform: scale(0.97); }
.filter-pill.is-active {
  background: linear-gradient(135deg, var(--purple-dark), var(--purple-mid));
  color: var(--white);
  border-color: transparent;
  box-shadow: 0 4px 18px rgba(101, 58, 146, 0.35);
}

/* ── Blog-style archive ── */
.archive-section {
  padding: 56px 32px 96px;
}
.archive-inner {
  max-width: var(--max);
  margin: 0 auto;
}
.archive-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
@media (max-width: 1099px) {
  .archive-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 679px) {
  .archive-grid { grid-template-columns: 1fr; }
}
.archive-card {
  position: relative;
  display: block;
  background: var(--dark-navy);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  transition: transform 0.28s cubic-bezier(0.4, 0, 0.2, 1),
              border-color 0.28s,
              box-shadow 0.28s;
  animation: archiveFadeIn 0.7s cubic-bezier(0.4, 0, 0.2, 1) both;
}
.archive-card.is-hidden {
  display: none;
}
.archive-card:nth-child(1) { animation-delay: 0.05s; }
.archive-card:nth-child(2) { animation-delay: 0.15s; }
.archive-card:nth-child(3) { animation-delay: 0.25s; }
.archive-card:nth-child(4) { animation-delay: 0.35s; }
.archive-card:nth-child(5) { animation-delay: 0.45s; }
@keyframes archiveFadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}
.archive-card:hover {
  transform: translateY(-4px);
  border-color: rgba(101, 58, 146, 0.45);
  box-shadow:
    0 24px 56px rgba(0, 0, 0, 0.5),
    0 0 0 1px rgba(101, 58, 146, 0.25);
}

.archive-card-banner {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--black);
  isolation: isolate;
}
.archive-card-banner::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--banner-gradient, linear-gradient(135deg, var(--purple-dark), var(--navy)));
  transform: scale(1);
  transform-origin: center;
  transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1), filter 0.6s;
  z-index: 0;
}
.archive-card:hover .archive-card-banner::before {
  transform: scale(1.08);
  filter: brightness(1.15) saturate(1.1);
}
.archive-card-banner-pattern {
  position: absolute;
  inset: 0;
  opacity: 0.55;
  z-index: 1;
  transition: opacity 0.5s, transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}
.archive-card:hover .archive-card-banner-pattern {
  opacity: 0.75;
  transform: scale(1.04);
}
.archive-card-banner-pattern.grid {
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.08) 1px, transparent 1px);
  background-size: 36px 36px;
  mask-image: radial-gradient(circle at 50% 50%, black 0%, transparent 80%);
  -webkit-mask-image: radial-gradient(circle at 50% 50%, black 0%, transparent 80%);
}
.archive-card-banner-pattern.diagonal {
  background-image: repeating-linear-gradient(
    -45deg,
    rgba(255, 255, 255, 0.06) 0,
    rgba(255, 255, 255, 0.06) 1px,
    transparent 1px,
    transparent 14px
  );
  mask-image: radial-gradient(ellipse at 50% 50%, black 10%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse at 50% 50%, black 10%, transparent 80%);
}
.archive-card-banner-glow {
  position: absolute;
  width: 60%;
  height: 60%;
  top: 20%;
  left: 20%;
  background: radial-gradient(circle, var(--banner-glow, rgba(187, 133, 117, 0.4)) 0%, transparent 70%);
  filter: blur(20px);
  z-index: 1;
  transition: opacity 0.6s, transform 0.6s;
  opacity: 0.7;
}
.archive-card:hover .archive-card-banner-glow {
  opacity: 1;
  transform: scale(1.1);
}
.archive-card-banner-content {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  align-items: flex-start;
  padding: 28px 30px;
  z-index: 2;
}
.archive-card-banner-month {
  font-size: 56px;
  font-weight: 900;
  line-height: 0.95;
  letter-spacing: -0.04em;
  color: var(--white);
  text-shadow: 0 2px 24px rgba(0, 0, 0, 0.5);
  transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}
.archive-card-banner-year {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.28em;
  color: rgba(255, 255, 255, 0.72);
  text-transform: uppercase;
  margin-top: 4px;
  transition: color 0.4s;
}
.archive-card:hover .archive-card-banner-month {
  transform: translateY(-4px);
}
.archive-card:hover .archive-card-banner-year {
  color: var(--gray-orange);
}
.archive-card-banner-corner {
  position: absolute;
  top: 18px;
  right: 20px;
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.7);
  background: rgba(0, 0, 0, 0.4);
  border: 1px solid rgba(255, 255, 255, 0.18);
  padding: 5px 10px;
  border-radius: 6px;
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  z-index: 3;
}

/* Theme-specific banner gradients */
.archive-card[data-theme="infrastructure"] {
  --banner-gradient: linear-gradient(135deg, #2d1b4e 0%, #653a92 35%, #192231 100%);
  --banner-glow: rgba(121, 102, 162, 0.42);
}
.archive-card[data-theme="correctness"] {
  --banner-gradient: linear-gradient(135deg, #3a1f1a 0%, #BB8575 30%, #192231 100%);
  --banner-glow: rgba(187, 133, 117, 0.4);
}

.archive-card-body {
  padding: 22px 26px 26px;
  border-top: 1px solid var(--border-soft);
}
.archive-card-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--gray-orange);
  margin-bottom: 10px;
}
.archive-card-eyebrow::before {
  content: '';
  width: 14px;
  height: 1px;
  background: var(--gray-orange);
}
.archive-card-title {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.018em;
  color: var(--white);
  line-height: 1.2;
  margin-bottom: 10px;
  transition: color 0.22s;
}
.archive-card:hover .archive-card-title {
  background: linear-gradient(90deg, var(--white), var(--purple-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.archive-card-excerpt {
  font-size: 13.5px;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 18px;
}
.archive-card-foot {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 11.5px;
  color: var(--text-muted);
  letter-spacing: 0.04em;
  padding-top: 14px;
  border-top: 1px solid var(--border-soft);
}
.archive-card-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--purple-light);
  transition: color 0.22s, transform 0.22s;
}
.archive-card-cta svg {
  width: 12px;
  height: 12px;
  transition: transform 0.22s;
}
.archive-card:hover .archive-card-cta {
  color: var(--gray-orange);
}
.archive-card:hover .archive-card-cta svg {
  transform: translateX(4px);
}

/* Show-more (placeholder, hidden when not needed) */
.archive-show-more {
  display: flex;
  justify-content: center;
  margin-top: 48px;
}
.archive-show-more button {
  appearance: none;
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border-mid);
  padding: 14px 32px;
  font-family: inherit;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  border-radius: 8px;
  cursor: pointer;
  transition: color 0.22s, background 0.22s, border-color 0.22s;
}
.archive-show-more button:hover {
  color: var(--white);
  background: var(--surface-2);
  border-color: var(--border-strong);
}

/* ── Patch page layout ── */
.patch-layout {
  max-width: var(--max);
  margin: 0 auto;
  padding: 56px 32px 96px;
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 64px;
  align-items: start;
}
.toc {
  position: sticky;
  top: 88px;
  align-self: start;
  padding-right: 12px;
  border-right: 1px solid var(--border-soft);
  max-height: calc(100vh - 100px);
  overflow-y: auto;
}
.toc-label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-bottom: 16px;
}
.toc ul { list-style: none; }
.toc li { margin-bottom: 4px; }
.toc a {
  display: block;
  padding: 6px 12px;
  font-size: 13px;
  color: var(--text-secondary);
  border-left: 2px solid transparent;
  margin-left: -2px;
  transition: color 0.18s, border-color 0.18s, background 0.18s;
  border-radius: 0 6px 6px 0;
}
.toc a:hover {
  color: var(--white);
  border-color: var(--purple-mid);
  background: var(--surface-1);
}
.toc a.sub {
  padding-left: 24px;
  font-size: 12px;
  color: var(--text-muted);
}
.toc a.subsub {
  padding-left: 36px;
  font-size: 11.5px;
  color: var(--text-faint);
}

.patch-content { min-width: 0; }

.toc a.is-active {
  color: var(--white);
  border-color: var(--gray-orange);
  background: var(--surface-1);
}

.patch-controls {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 24px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--border-soft);
}
.patch-toggle-all {
  appearance: none;
  background: transparent;
  border: 1px solid var(--border-mid);
  color: var(--text-secondary);
  font-family: inherit;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  padding: 9px 18px;
  border-radius: 999px;
  cursor: pointer;
  transition: color 0.18s, border-color 0.18s, background 0.18s;
}
.patch-toggle-all:hover {
  color: var(--white);
  border-color: var(--gray-orange);
  background: var(--surface-1);
}

.patch-section {
  margin-top: 16px;
  scroll-margin-top: 88px;
  background: var(--surface-1);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color 0.22s, background 0.22s;
}
.patch-section:hover { border-color: var(--border-mid); }
.patch-section.is-expanded { border-color: rgba(101, 58, 146, 0.35); }
.patch-section:first-child { margin-top: 0; }

.patch-section-header {
  appearance: none;
  width: 100%;
  background: transparent;
  border: 0;
  padding: 22px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  text-align: left;
  cursor: pointer;
  font-family: inherit;
  color: inherit;
  transition: background 0.2s;
}
.patch-section-header:hover { background: var(--surface-2); }
.patch-section-header:focus-visible {
  outline: 2px solid var(--purple-mid);
  outline-offset: -2px;
}
.patch-section-meta { flex: 1; min-width: 0; }
.patch-section-eyebrow {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--gray-orange);
  margin-bottom: 6px;
}
.patch-section-title {
  font-size: 26px;
  font-weight: 900;
  letter-spacing: -0.025em;
  color: var(--white);
  background: linear-gradient(90deg, var(--white) 0%, var(--purple-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  display: inline-block;
}
.patch-section-controls-right {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-shrink: 0;
}
.patch-section-count {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-muted);
  background: var(--surface-2);
  border: 1px solid var(--border-soft);
  padding: 5px 11px;
  border-radius: 999px;
  white-space: nowrap;
}
.patch-section.is-expanded .patch-section-count {
  color: var(--gray-orange);
  border-color: rgba(187, 133, 117, 0.3);
  background: rgba(187, 133, 117, 0.08);
}
.patch-section-chevron {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--surface-2);
  color: var(--text-muted);
  transition: transform 0.32s cubic-bezier(0.4, 0, 0.2, 1), background 0.22s, color 0.22s;
}
.patch-section-chevron svg {
  width: 14px;
  height: 14px;
}
.patch-section.is-expanded .patch-section-chevron {
  transform: rotate(180deg);
  background: rgba(101, 58, 146, 0.18);
  color: var(--purple-light);
}
.patch-section-header:hover .patch-section-chevron {
  color: var(--white);
}

.patch-section-body {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height 0.5s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.35s ease, padding 0.4s ease;
  padding: 0 28px;
}
.patch-section.is-expanded .patch-section-body {
  max-height: 12000px;
  opacity: 1;
  padding: 4px 28px 28px;
}
.patch-section-intro {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 18px;
  max-width: 720px;
}
.patch-section-rule {
  height: 1px;
  background: linear-gradient(90deg, var(--purple-dark), transparent);
  margin-bottom: 22px;
}

.patch-subsection {
  margin-top: 36px;
  scroll-margin-top: 88px;
}
.patch-subsection-title {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--purple-light);
  margin-bottom: 16px;
  padding-left: 14px;
  border-left: 2px solid var(--purple-dark);
}

.patch-card {
  background: var(--surface-1);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  padding: 24px 26px;
  margin-bottom: 14px;
  transition: border-color 0.18s, background 0.18s;
}
.patch-card:hover {
  border-color: var(--border-mid);
  background: var(--surface-2);
}
.patch-card-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 14px;
  letter-spacing: -0.005em;
}
.patch-card-row {
  display: grid;
  grid-template-columns: 86px 1fr;
  gap: 16px;
  padding: 10px 0;
  border-top: 1px solid var(--border-soft);
}
.patch-card-row:first-of-type { border-top: none; padding-top: 0; }
.patch-card-row:last-of-type { padding-bottom: 0; }
.patch-card-label {
  font-size: 9.5px;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gray-orange);
  padding-top: 3px;
}
.patch-card-text {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.65;
}
.patch-card-text strong { color: var(--text-primary); font-weight: 600; }
.patch-card-text code {
  font-family: ui-monospace, 'SF Mono', Menlo, Consolas, monospace;
  font-size: 12.5px;
  padding: 2px 6px;
  background: var(--surface-3);
  border-radius: 4px;
  color: var(--purple-light);
}

/* ── Cross-month theme block ── */
.theme-block {
  margin-top: 64px;
  padding: 32px;
  background: linear-gradient(135deg, rgba(101, 58, 146, 0.10), rgba(187, 133, 117, 0.06));
  border: 1px solid var(--border-mid);
  border-radius: var(--radius-lg);
}
.theme-block-label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--gray-orange);
  margin-bottom: 12px;
}
.theme-block-title {
  font-size: 22px;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--white);
  margin-bottom: 14px;
}
.theme-block-text {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.75;
}
.theme-block-text em {
  font-style: italic;
  color: var(--gray-orange);
  font-weight: 500;
}

/* ── Patch nav (prev/next bottom) ── */
.patch-nav {
  margin-top: 64px;
  padding-top: 28px;
  border-top: 1px solid var(--border-soft);
  display: flex;
  justify-content: space-between;
  gap: 16px;
}
.patch-nav-link {
  flex: 0 1 320px;
  padding: 18px 22px;
  background: var(--surface-1);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  transition: border-color 0.18s, background 0.18s, transform 0.18s;
}
.patch-nav-link:hover {
  border-color: var(--border-strong);
  background: var(--surface-2);
  transform: translateY(-1px);
}
.patch-nav-link.next { text-align: right; margin-left: auto; }
.patch-nav-direction {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-bottom: 6px;
}
.patch-nav-target {
  font-size: 15px;
  font-weight: 700;
  color: var(--white);
}

/* ── Footer ── */
.footer {
  border-top: 1px solid var(--border-soft);
  padding: 36px 32px;
  background: rgba(8, 12, 20, 0.6);
}
.footer-inner {
  max-width: var(--max);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-size: 12px;
  color: var(--text-faint);
  letter-spacing: 0.05em;
}
.footer-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-muted);
}
.footer-brand img { height: 18px; width: auto; opacity: 0.7; }

/* ── Responsive ── */
@media (max-width: 900px) {
  .hero { padding: 64px 24px 48px; }
  .patch-layout {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 40px 24px 64px;
  }
  .toc {
    position: static;
    border-right: none;
    border-bottom: 1px solid var(--border-soft);
    padding: 0 0 20px;
    max-height: none;
  }
  .toc ul { display: flex; flex-wrap: wrap; gap: 8px; }
  .toc li { margin-bottom: 0; }
  .toc a { padding: 6px 10px; font-size: 12px; border-left: none; border: 1px solid var(--border-mid); border-radius: 6px; }
  .toc a.sub, .toc a.subsub { padding-left: 10px; font-size: 11px; }
  .patch-section-title { font-size: 26px; }
  .patch-card-row { grid-template-columns: 1fr; gap: 4px; }
  .patch-card-label { padding-top: 0; }
  .patch-nav { flex-direction: column; }
  .patch-nav-link.next { text-align: left; margin-left: 0; }
  .archive-section { padding-left: 24px; padding-right: 24px; }
  .archive-card-banner-month { font-size: 44px; }
  .patch-section-header { padding: 18px 22px; gap: 12px; }
  .patch-section-title { font-size: 22px; }
  .patch-section.is-expanded .patch-section-body { padding: 4px 22px 22px; }
  .patch-section-body { padding: 0 22px; }
  .patch-section-count { display: none; }
  .nav-inner { padding: 14px 20px; gap: 12px; }
  .nav-brand { flex-shrink: 0; }
  .nav-links { gap: 16px; min-width: 0; overflow-x: auto; scrollbar-width: none; -webkit-overflow-scrolling: touch; }
  .nav-links::-webkit-scrollbar { display: none; }
  .nav-links a { white-space: nowrap; }
  .nav-brand-tag { display: none; }
}

@media (max-width: 520px) {
  .hero-title { font-size: 36px; }
  .hero-meta { flex-direction: column; gap: 14px; }
  .archive-card-banner-month { font-size: 36px; }
  .archive-card-body { padding: 18px 20px 22px; }
  .patch-card { padding: 20px; }
  .patch-section-header { padding: 16px 18px; }
  .patch-section-chevron { width: 28px; height: 28px; }
  .patch-section-title { font-size: 24px; }
  .footer-inner { flex-direction: column; align-items: flex-start; gap: 12px; text-align: left; }
}