/* Ecat site: header, hero, stats, intro, page hero. */

.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  border-bottom: 1px solid var(--line);
  background: rgba(10, 14, 19, 0.82);
  backdrop-filter: blur(16px) saturate(140%);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  height: var(--header);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  min-width: max-content;
}

.brand-pet {
  width: 32px;
  height: 32px;
  transition: transform 0.25s ease;
}

.brand:hover .brand-pet {
  transform: rotate(-6deg) scale(1.06);
}

.brand-name {
  font-size: 1.08rem;
  font-weight: 700;
  letter-spacing: -0.04em;
}

.brand-cn {
  font-size: 0.78rem;
  color: var(--muted-2);
  letter-spacing: 0.02em;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(14px, 1.8vw, 26px);
}

.site-nav a {
  position: relative;
  padding-block: 6px;
  font-size: 0.88rem;
  color: var(--muted);
  white-space: nowrap;
  transition: color 0.18s ease;
}

.site-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: 0;
  height: 1px;
  background: var(--orange);
  transition: right 0.22s ease;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--ink);
}

.site-nav a:hover::after,
.site-nav a[aria-current="page"]::after {
  right: 0;
}

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

.lang-toggle {
  min-width: 42px;
  height: 36px;
  padding: 0 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--muted);
  background: rgba(18, 26, 35, 0.65);
  transition:
    color 0.18s ease,
    border-color 0.18s ease;
}

.lang-toggle:hover {
  color: var(--orange-soft);
  border-color: rgba(232, 116, 59, 0.55);
}

.menu-toggle {
  display: none;
  width: 38px;
  height: 38px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 50%;
  color: var(--muted);
  background: rgba(18, 26, 35, 0.65);
}

/* Hero */

.hero {
  position: relative;
  display: flex;
  align-items: center;
  min-height: min(780px, calc(100dvh - var(--header)));
  padding-block: clamp(44px, 7vh, 84px) clamp(52px, 8vh, 92px);
  overflow: hidden;
}

.hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--line-strong), transparent);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.04fr) minmax(320px, 0.96fr);
  align-items: center;
  gap: clamp(32px, 5vw, 72px);
}

.hero-copy {
  max-width: 660px;
}

.hero-title {
  max-width: 11ch;
  margin-bottom: 22px;
  text-wrap: balance;
}

.hero-title-en {
  color: var(--orange);
}

.hero-lead {
  max-width: 44ch;
  font-size: clamp(1rem, 1.5vw, 1.13rem);
  line-height: 1.72;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.hero-stage {
  position: relative;
  display: grid;
  place-items: center;
  width: 100%;
  max-width: 580px;
  aspect-ratio: 1 / 1;
  justify-self: end;
}

.hero-stage::before {
  content: "";
  position: absolute;
  inset: 8%;
  border-radius: 50%;
  background:
    radial-gradient(circle at 42% 40%, rgba(232, 116, 59, 0.19), transparent 57%),
    radial-gradient(circle at 64% 66%, rgba(47, 143, 138, 0.14), transparent 54%);
  filter: blur(12px);
  pointer-events: none;
}

#cat-canvas {
  position: absolute;
  inset: 0;
  z-index: 1;
  width: 100%;
  height: 100%;
  opacity: 0;
  transition: opacity 0.8s ease;
}

.hero-stage.is-3d #cat-canvas {
  opacity: 1;
}

.hero-fallback {
  position: relative;
  z-index: 0;
  width: 76%;
  filter: drop-shadow(0 28px 48px rgba(0, 0, 0, 0.38));
  transition:
    opacity 0.55s ease,
    transform 0.55s ease;
}

.hero-stage.is-3d .hero-fallback {
  opacity: 0;
  transform: scale(0.96);
}

/* Stats */

.back-top-sentinel {
  height: 1px;
}

.stats-band {
  border-bottom: 1px solid var(--line);
  background: rgba(18, 26, 35, 0.38);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}

.stat {
  padding: 26px 24px;
  border-left: 1px solid var(--line);
}

.stat:first-child {
  border-left: 0;
  padding-left: 0;
}

.stat strong {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 3vw, 2.15rem);
  font-weight: 600;
  line-height: 1.1;
  color: var(--orange);
}

.stat span {
  display: block;
  margin-top: 5px;
  font-size: 0.82rem;
  color: var(--muted);
}

/* Intro */

.intro-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.04fr) minmax(300px, 0.96fr);
  align-items: center;
  gap: clamp(32px, 5vw, 72px);
}

.intro-copy h2 {
  margin-bottom: 18px;
  text-wrap: balance;
}

.intro-copy > p {
  max-width: 56ch;
  font-size: 1.02rem;
}

.check-list {
  display: grid;
  gap: 12px;
  margin-top: 26px;
}

.check-list li {
  position: relative;
  padding-left: 26px;
  font-size: 0.94rem;
  color: var(--muted);
}

.check-list li::before {
  content: "";
  position: absolute;
  top: 0.62em;
  left: 0;
  width: 13px;
  height: 7px;
  border-left: 1.5px solid var(--orange);
  border-bottom: 1.5px solid var(--orange);
  transform: rotate(-45deg);
}

.pet-stack {
  position: relative;
  min-height: 390px;
}

.pet-stack img {
  position: absolute;
  filter: drop-shadow(0 22px 40px rgba(0, 0, 0, 0.4));
}

.pet-stack-main {
  top: 50%;
  left: 50%;
  width: 280px;
  transform: translate(-50%, -50%);
}

.pet-stack-a {
  top: 6%;
  right: 4%;
  width: 132px;
  transform: rotate(9deg);
}

.pet-stack-b {
  bottom: 3%;
  left: 1%;
  width: 118px;
  transform: rotate(-10deg);
}

.arch-panel {
  margin-top: clamp(48px, 7vw, 80px);
  padding: clamp(22px, 3vw, 32px);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  background:
    linear-gradient(180deg, rgba(23, 34, 45, 0.86), rgba(14, 20, 27, 0.9));
}

.arch-panel h3 {
  margin-bottom: 8px;
}

.arch-note {
  max-width: 66ch;
  margin-bottom: 22px;
  font-size: 0.9rem;
}

.arch-stack {
  display: grid;
  gap: 0;
}

.arch-row {
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr);
  gap: 16px;
  padding-block: 14px;
  border-top: 1px solid var(--line);
}

.arch-row:first-child {
  border-top: 0;
}

.arch-label {
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--muted-2);
  text-transform: uppercase;
}

.arch-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}

.arch-chips span {
  padding: 4px 9px;
  border: 1px solid var(--line);
  border-radius: 7px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--muted);
  background: rgba(10, 14, 19, 0.55);
}

.arch-row:nth-child(3) .arch-chips span {
  color: var(--orange-soft);
  border-color: rgba(232, 116, 59, 0.3);
}

.arch-row:nth-child(4) .arch-chips span {
  color: var(--teal-soft);
  border-color: rgba(47, 143, 138, 0.32);
}

/* Page hero for subpages */

.page-hero {
  padding-block: clamp(48px, 7vw, 88px) clamp(32px, 4vw, 48px);
  border-bottom: 1px solid var(--line);
}

.page-hero-grid {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}

.page-hero-copy {
  max-width: 760px;
}

.page-hero h1 {
  margin-bottom: 16px;
}

.page-hero p {
  max-width: 62ch;
  font-size: 1.02rem;
}

.page-hero-pet {
  width: 132px;
  flex: none;
  filter: drop-shadow(0 18px 30px rgba(0, 0, 0, 0.35));
}

/* Breadcrumbs */

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--muted-2);
}

.breadcrumbs a {
  color: var(--muted);
}

.breadcrumbs a:hover {
  color: var(--orange-soft);
}