:root {
  --void: #010208;
  --deep-navy: #07101e;
  --signal-cyan: #67eaff;
  --orbit-violet: #9568ff;
  --ice-white: #eafbff;
  --archive-blue-grey: #8da0b7;
  --font-display: "Iowan Old Style", "Source Han Serif SC", "Noto Serif CJK SC", "Songti SC", serif;
  --font-body: "Microsoft YaHei UI", "PingFang SC", "Noto Sans CJK SC", sans-serif;
  --font-data: "Cascadia Mono", "SFMono-Regular", Consolas, monospace;
  color-scheme: dark;
  font-family: var(--font-body);
  font-synthesis: none;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

:where(h1, h2, h3, h4, h5, h6) {
  scroll-margin-top: 2rem;
}

body {
  margin: 0;
  padding-inline: env(safe-area-inset-left) env(safe-area-inset-right);
  background:
    radial-gradient(circle at 78% 8%, rgba(149, 104, 255, 0.08), transparent 30rem),
    radial-gradient(circle at 12% 30%, rgba(103, 234, 255, 0.05), transparent 26rem),
    var(--void);
  color: var(--ice-white);
  font-size: 1rem;
  line-height: 1.7;
}

body::before {
  position: fixed;
  z-index: -1;
  inset: 0;
  background: linear-gradient(180deg, transparent, rgba(7, 16, 30, 0.34));
  content: "";
  pointer-events: none;
}

body.is-inner::before {
  background:
    radial-gradient(circle, rgba(234, 251, 255, 0.16) 0 1px, transparent 1.4px) 0 0 / 6.5rem 6.5rem,
    radial-gradient(circle, rgba(103, 234, 255, 0.1) 0 0.75px, transparent 1.2px) 2.4rem 1.8rem / 9rem 9rem,
    linear-gradient(180deg, transparent, rgba(7, 16, 30, 0.34));
  animation: none;
}

a {
  color: inherit;
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.2em;
}

button,
a {
  -webkit-tap-highlight-color: rgba(103, 234, 255, 0.16);
  touch-action: manipulation;
}

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

::selection {
  background: var(--orbit-violet);
  color: var(--ice-white);
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 0.75rem;
  left: 0.75rem;
  padding: 0.65rem 0.9rem;
  transform: translateY(-180%);
  background: var(--ice-white);
  color: var(--void);
  font-family: var(--font-data);
  font-size: 0.8rem;
}

.skip-link:focus-visible {
  transform: translateY(0);
}

.site-header {
  position: relative;
  z-index: 10;
  border-bottom: 1px solid rgba(141, 160, 183, 0.18);
  background: rgba(1, 2, 8, 0.74);
  backdrop-filter: blur(16px);
  padding-top: env(safe-area-inset-top);
}

.site-header__inner,
.site-footer__inner,
.home-shell,
.content-shell {
  width: min(70rem, calc(100% - 2.5rem));
  margin-inline: auto;
}

.site-header__inner {
  display: flex;
  min-height: 4.5rem;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.site-brand {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  color: var(--ice-white);
  font-family: var(--font-data);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-decoration: none;
  white-space: nowrap;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.site-nav a,
.nav-toggle {
  display: inline-flex;
  min-width: 44px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  padding: 0.6rem 0.8rem;
  border: 0;
  color: var(--archive-blue-grey);
  font: 0.82rem/1 var(--font-data);
  text-decoration: none;
}

.site-nav a:hover {
  color: var(--signal-cyan);
}

.nav-toggle {
  display: none;
  border: 1px solid rgba(141, 160, 183, 0.38);
  background: transparent;
  cursor: pointer;
}

.home-hero {
  display: grid;
  min-height: calc(100svh - 4.5rem);
  grid-template-columns: minmax(0, 55fr) minmax(17.5rem, 45fr);
  align-items: center;
  gap: clamp(2rem, 6vw, 5rem);
  padding-block: clamp(4.5rem, 10vw, 8rem);
}

.home-hero__copy {
  position: relative;
  z-index: 1;
  max-width: 40rem;
}

@media (min-width: 761px) {
  .home-hero__copy {
    max-width: 25rem;
  }
}

.hero-eyebrow,
.section-kicker,
.post-card__date,
.article-header time,
.archive-list time {
  margin: 0;
  color: var(--signal-cyan);
  font-family: var(--font-data);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  line-height: 1.5;
  text-transform: uppercase;
}

.site-name {
  margin: clamp(1.5rem, 4vw, 3.25rem) 0 0.6rem;
  color: var(--archive-blue-grey);
  font-family: var(--font-data);
  font-size: 0.82rem;
  letter-spacing: 0.08em;
}

.home-hero h1,
.content-shell > h1,
.article-header h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 500;
  letter-spacing: -0.035em;
  line-height: 1.1;
  text-wrap: balance;
}

.home-hero h1 {
  max-width: none;
  font-size: clamp(2.75rem, 5.8vw, 5.3rem);
  letter-spacing: 0.015em;
  white-space: nowrap;
}

.hero-description {
  max-width: 30rem;
  margin: 1.5rem 0 0;
  color: var(--archive-blue-grey);
  font-size: clamp(1rem, 1.8vw, 1.2rem);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 1.5rem;
  margin-top: 2.5rem;
}

.hero-entry,
.motion-toggle {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
}

.hero-entry {
  gap: 0.8rem;
  color: var(--ice-white);
  font-family: var(--font-data);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-decoration: none;
}

.hero-entry span {
  color: var(--signal-cyan);
}

.motion-toggle {
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--archive-blue-grey);
  cursor: pointer;
  font: 0.72rem/1 var(--font-data);
}

.motion-toggle:hover,
.motion-toggle[aria-pressed="true"] {
  color: var(--signal-cyan);
}

.home-hero:has(.particle-fallback) .motion-toggle {
  display: none;
}

.hero-scene {
  min-width: 0;
  min-height: clamp(21rem, 52vw, 42rem);
}

.home-section {
  padding-block: clamp(4.5rem, 9vw, 8rem);
  border-top: 1px solid rgba(141, 160, 183, 0.18);
}

.section-heading {
  display: grid;
  grid-template-columns: minmax(10rem, 0.38fr) 1fr;
  align-items: baseline;
  gap: 1.5rem;
  margin-bottom: clamp(2rem, 5vw, 4rem);
}

.section-heading h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3.4rem);
  font-weight: 500;
  line-height: 1.2;
}

.post-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid rgba(141, 160, 183, 0.25);
}

.post-card {
  position: relative;
  min-width: 0;
  padding: clamp(1.5rem, 4vw, 2.5rem);
  border-bottom: 1px solid rgba(141, 160, 183, 0.25);
  content-visibility: auto;
  contain-intrinsic-size: auto 19rem;
  transition: transform 180ms ease;
}

.post-card:nth-child(odd) {
  border-right: 1px solid rgba(141, 160, 183, 0.25);
}

.post-card:hover {
  z-index: 1;
  box-shadow: inset 0 0 0 1px rgba(103, 234, 255, 0.24), 0 0 1.5rem rgba(103, 234, 255, 0.08);
  transform: translateY(-3px);
}

.post-card h3 {
  margin: 1.25rem 0 0;
  font-family: var(--font-display);
  font-size: clamp(1.45rem, 3vw, 2rem);
  font-weight: 500;
  line-height: 1.3;
}

.post-card h3 a {
  text-decoration: none;
}

.post-card h3 a,
.archive-list a {
  display: flex;
  min-block-size: 44px;
  align-items: center;
}

.post-card__categories {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.75rem;
  margin: 0.75rem 0 0;
  padding: 0;
  list-style: none;
}

.post-card__categories a {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  color: var(--archive-blue-grey);
  font: 0.7rem/1 var(--font-data);
  letter-spacing: 0.06em;
  text-decoration: none;
}

.post-card__categories a:hover {
  color: var(--signal-cyan);
}

.post-card:hover h3 a {
  color: var(--signal-cyan);
}

.post-card__summary {
  display: -webkit-box;
  overflow: hidden;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 4;
  margin: 1rem 0 0;
  color: var(--archive-blue-grey);
  font-size: 0.92rem;
  text-overflow: ellipsis;
}

.post-card__ribbon {
  position: absolute;
  z-index: 2;
  top: 1.1rem;
  right: -2.65rem;
  display: none;
  width: 9rem;
  min-height: 1.8rem;
  align-items: center;
  justify-content: center;
  transform: rotate(45deg);
  border-block: 1px solid rgba(255, 235, 239, 0.5);
  background: linear-gradient(90deg, #7d0019 0%, #ef1745 48%, #a40024 100%);
  box-shadow: 0 0.45rem 1rem rgba(91, 0, 24, 0.38), inset 0 1px rgba(255, 255, 255, 0.28);
  color: #fff5f7;
  font: 800 0.68rem/1 var(--font-data);
  letter-spacing: 0.2em;
  text-indent: 0.2em;
  text-shadow: 0 1px 2px rgba(53, 0, 12, 0.72);
}

.post-card.is-new .post-card__ribbon {
  display: flex;
}

.post-card__link {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  gap: 0.5rem;
  margin-top: 1.25rem;
  color: var(--ice-white);
  font-family: var(--font-data);
  font-size: 0.76rem;
  text-decoration: none;
}

.post-card__link span {
  color: var(--orbit-violet);
}

.catalogue-content {
  max-width: 48rem;
  margin-left: auto;
}

.catalogue-content h2,
.catalogue-content h3 {
  margin: 2.25rem 0 0.75rem;
  font-family: var(--font-display);
  font-weight: 500;
}

.catalogue-content h2:first-child {
  margin-top: 0;
}

.catalogue-content ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.catalogue-content li {
  border-bottom: 1px solid rgba(141, 160, 183, 0.18);
}

.catalogue-content li a {
  display: flex;
  min-height: 44px;
  align-items: center;
  color: var(--archive-blue-grey);
  text-decoration: none;
}

.catalogue-content li a:hover {
  color: var(--signal-cyan);
}

.content-shell {
  padding-block: clamp(4.5rem, 10vw, 8rem);
}

.content-shell > h1 {
  margin-top: 0.5rem;
  font-size: clamp(2.8rem, 7vw, 5.5rem);
}

.archive-list,
.taxonomy-index {
  max-width: 52rem;
  margin: clamp(2.5rem, 6vw, 5rem) 0 0 auto;
  padding: 0;
  border-top: 1px solid rgba(141, 160, 183, 0.25);
  list-style: none;
}

.archive-list li {
  display: grid;
  grid-template-columns: 8.5rem minmax(0, 1fr);
  align-items: baseline;
  gap: 1.5rem;
  padding-block: 1.1rem;
  border-bottom: 1px solid rgba(141, 160, 183, 0.25);
}

.archive-list a {
  font-family: var(--font-display);
  font-size: 1.2rem;
  text-decoration: none;
}

.archive-list a:hover {
  color: var(--signal-cyan);
}

.taxonomy-index li {
  border-bottom: 1px solid rgba(141, 160, 183, 0.25);
}

.taxonomy-index a {
  display: flex;
  min-height: 56px;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  text-decoration: none;
}

.taxonomy-index a:hover span {
  color: var(--signal-cyan);
}

.taxonomy-index span {
  font-family: var(--font-display);
  font-size: 1.2rem;
}

.taxonomy-index small {
  color: var(--archive-blue-grey);
  font: 0.72rem var(--font-data);
}

.empty-state {
  margin-top: 3rem;
  color: var(--archive-blue-grey);
}

.archive-list > .empty-state,
.taxonomy-index > .empty-state {
  display: block;
  padding-block: 1.25rem;
  border-bottom: 1px solid rgba(141, 160, 183, 0.25);
}

.site-footer {
  border-top: 1px solid rgba(141, 160, 183, 0.18);
  padding-bottom: env(safe-area-inset-bottom);
}

.site-footer__inner {
  display: flex;
  min-height: 8rem;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  color: var(--archive-blue-grey);
  font-family: var(--font-data);
  font-size: 0.72rem;
}

@media (max-width: 760px) {
  .site-brand {
    font-size: 0.68rem;
    letter-spacing: 0.08em;
  }

  .site-header__inner,
  .site-footer__inner,
  .home-shell,
  .content-shell {
    width: min(100% - 2rem, 70rem);
  }

  .site-header__inner {
    position: relative;
    flex-wrap: wrap;
  }

  .nav-toggle {
    display: none;
  }

  .is-enhanced .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    width: 100%;
    flex-wrap: wrap;
    padding-bottom: 0.75rem;
  }

  .is-enhanced .site-nav {
    display: none;
  }

  .is-enhanced .site-nav.is-open {
    display: flex;
  }

  .site-nav a {
    flex: 1 1 auto;
  }

  .home-hero {
    min-height: auto;
    grid-template-columns: 1fr;
    gap: 1rem;
    padding-top: clamp(4rem, 16vw, 6rem);
  }

  .home-hero h1 {
    font-size: clamp(2.75rem, 15vw, 4.6rem);
  }

  .hero-scene {
    min-height: clamp(14rem, 70vw, 22rem);
  }

  .section-heading {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }

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

  .post-card:nth-child(odd) {
    border-right: 0;
  }

  .catalogue-content {
    margin-left: 0;
  }

  .archive-list,
  .taxonomy-index {
    margin-left: 0;
  }

  .archive-list li {
    grid-template-columns: 1fr;
    gap: 0.35rem;
  }

  .site-footer__inner {
    display: block;
    padding-block: 2rem;
  }
}

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

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }

  .motion-toggle {
    display: none;
  }
}