:root {
  --ink: #101820;
  --ink-soft: #5a6673;
  --paper: #f5f7f9;
  --paper-deep: #e4eaef;
  --haze: #8494a3;
  --signal: #d9773a;
  --line: rgba(16, 24, 32, 0.1);
  --footer: #121a22;
  --footer-muted: #8b98a6;
  --white: #ffffff;
  --font-en: "Sora", sans-serif;
  --font-zh: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", sans-serif;
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: var(--font-zh);
  font-size: 16px;
  line-height: 1.7;
  background: var(--paper);
}

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

a {
  color: inherit;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.1rem clamp(1.25rem, 4vw, 3rem);
  color: var(--white);
  mix-blend-mode: difference;
  transition: background 0.35s ease, color 0.35s ease, border-color 0.35s ease,
    backdrop-filter 0.35s ease;
}

.site-header.is-scrolled {
  mix-blend-mode: normal;
  color: var(--ink);
  background: rgba(245, 247, 249, 0.9);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}

.logo {
  font-family: var(--font-zh);
  font-weight: 700;
  letter-spacing: 0.18em;
  text-decoration: none;
  font-size: 1rem;
  transition: letter-spacing 0.35s var(--ease-out);
}

.logo:hover {
  letter-spacing: 0.28em;
}

.nav a {
  position: relative;
  font-family: var(--font-en);
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-decoration: none;
  text-transform: uppercase;
}

.nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.28rem;
  width: 100%;
  height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.35s var(--ease-out);
}

.nav a:hover::after {
  transform: scaleX(1);
}

.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;
  display: grid;
  align-items: end;
  overflow: hidden;
  color: var(--white);
}

.hero-media {
  position: absolute;
  inset: -8% 0;
  width: 100%;
  height: 116%;
  object-fit: cover;
  object-position: center;
  will-change: transform;
  transform: scale(1.06);
  animation: hero-zoom 10s var(--ease-out) forwards;
}

.hero-veil {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(8, 12, 18, 0.28) 0%, rgba(8, 12, 18, 0.18) 35%, rgba(8, 12, 18, 0.72) 100%),
    linear-gradient(90deg, rgba(8, 12, 18, 0.45) 0%, transparent 55%);
  animation: veil-in 1.4s var(--ease-out) both;
}

.hero-content {
  position: relative;
  z-index: 1;
  width: min(980px, calc(100% - 2.5rem));
  margin: 0 auto;
  padding: 0 0 clamp(4.5rem, 12vh, 7rem);
  will-change: transform, opacity;
}

.brand-en {
  margin: 0 0 0.85rem;
  font-family: var(--font-en);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.55em;
  opacity: 0;
  animation: rise 0.9s var(--ease-out) forwards 0.15s;
}

.brand-zh {
  margin: 0;
  font-size: clamp(3rem, 9vw, 5.8rem);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: 0.18em;
  opacity: 0;
  animation: rise 0.95s var(--ease-out) forwards 0.28s;
}

.hero-lead {
  max-width: 28rem;
  margin: 1.35rem 0 0;
  color: rgba(255, 255, 255, 0.86);
  font-size: clamp(0.98rem, 2vw, 1.1rem);
  opacity: 0;
  animation: rise 0.95s var(--ease-out) forwards 0.42s;
}

.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  margin-top: 1.8rem;
  min-height: 2.9rem;
  padding: 0 1.45rem;
  background: var(--signal);
  color: var(--white);
  text-decoration: none;
  font-size: 0.95rem;
  letter-spacing: 0.06em;
  opacity: 0;
  animation: rise 0.95s var(--ease-out) forwards 0.55s;
  transition: transform 0.3s var(--ease-out), background 0.3s ease;
}

.btn span {
  position: relative;
  z-index: 1;
}

.btn::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, transparent 20%, rgba(255, 255, 255, 0.28) 50%, transparent 80%);
  transform: translateX(-120%);
  transition: transform 0.55s var(--ease-out);
}

.btn:hover {
  transform: translateY(-3px);
  background: #c9652b;
}

.btn:hover::before {
  transform: translateX(120%);
}

.scroll-cue {
  position: absolute;
  left: 50%;
  bottom: 1.6rem;
  z-index: 2;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  width: 1.4rem;
  height: 2.2rem;
  border: 1px solid rgba(255, 255, 255, 0.45);
  border-radius: 999px;
  transform: translateX(-50%);
  opacity: 0;
  animation: rise 0.9s var(--ease-out) forwards 1s;
  transition: opacity 0.35s ease;
}

.scroll-cue.is-hidden {
  opacity: 0;
  pointer-events: none;
}

.scroll-cue-line {
  width: 2px;
  height: 0.55rem;
  margin-top: 0.4rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.85);
  animation: cue-pulse 1.6s ease-in-out infinite;
}

.services {
  width: min(1120px, calc(100% - 2.5rem));
  margin: 0 auto;
  padding: clamp(4rem, 9vw, 6.5rem) 0 clamp(4rem, 8vw, 5.5rem);
}

.section-head {
  max-width: 34rem;
  margin-bottom: clamp(2.5rem, 6vw, 4rem);
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.8s var(--ease-out), transform 0.8s var(--ease-out);
}

.section-head.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.eyebrow {
  margin: 0 0 0.7rem;
  font-family: var(--font-en);
  font-size: 0.78rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--haze);
}

.section-head h2 {
  margin: 0 0 0.7rem;
  font-size: clamp(1.9rem, 4vw, 2.6rem);
  font-weight: 700;
  letter-spacing: 0.08em;
}

.section-head p:last-child {
  margin: 0;
  color: var(--ink-soft);
}

.service-band {
  --reveal-delay: 0ms;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: clamp(1.5rem, 4vw, 3rem);
  align-items: center;
  margin-bottom: clamp(2.5rem, 6vw, 4.5rem);
}

.service-band:last-child {
  margin-bottom: 0;
}

.service-band.reverse {
  grid-template-columns: 0.85fr 1.15fr;
}

.service-band.reverse .service-visual {
  order: 2;
}

.service-band.reverse .service-copy {
  order: 1;
}

.service-visual {
  overflow: hidden;
  background: var(--paper-deep);
  min-height: clamp(220px, 36vw, 380px);
  clip-path: inset(0 100% 0 0);
  transition: clip-path 1s var(--ease-out);
  transition-delay: var(--reveal-delay);
}

.service-band.reverse .service-visual {
  clip-path: inset(0 0 0 100%);
}

.service-band.is-visible .service-visual {
  clip-path: inset(0 0 0 0);
}

.service-visual img {
  width: 100%;
  height: 100%;
  min-height: clamp(220px, 36vw, 380px);
  object-fit: cover;
  transform: scale(1.12);
  transition: transform 1.2s var(--ease-out);
  transition-delay: var(--reveal-delay);
}

.service-band.is-visible .service-visual img {
  transform: scale(1);
}

.service-band:hover .service-visual img {
  transform: scale(1.05);
  transition-duration: 0.8s;
}

.service-copy {
  padding: 0.5rem 0;
}

.service-index,
.service-copy h3,
.service-copy p {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
}

.service-band.is-visible .service-index,
.service-band.is-visible .service-copy h3,
.service-band.is-visible .service-copy p {
  opacity: 1;
  transform: translateY(0);
}

.service-band.is-visible .service-index {
  transition-delay: calc(var(--reveal-delay) + 120ms);
}

.service-band.is-visible .service-copy h3 {
  transition-delay: calc(var(--reveal-delay) + 220ms);
}

.service-band.is-visible .service-copy p {
  transition-delay: calc(var(--reveal-delay) + 320ms);
}

.service-index {
  display: block;
  margin-bottom: 0.85rem;
  font-family: var(--font-en);
  font-size: 0.85rem;
  letter-spacing: 0.18em;
  color: var(--haze);
}

.service-copy h3 {
  margin: 0;
  font-size: clamp(1.45rem, 3vw, 1.85rem);
  font-weight: 700;
  letter-spacing: 0.08em;
}

.service-copy p {
  margin: 0.85rem 0 0;
  color: var(--ink-soft);
  max-width: 28rem;
}

.site-footer {
  background: var(--footer);
  color: var(--footer-muted);
  border-top: none;
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.8s var(--ease-out), transform 0.8s var(--ease-out);
}

.site-footer.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.footer-inner {
  width: min(1120px, calc(100% - 2.5rem));
  margin: 0 auto;
  padding: 2.4rem 0 2.2rem;
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1.5rem 2rem;
}

.footer-main {
  max-width: 28rem;
}

.footer-brand {
  margin: 0;
  color: rgba(255, 255, 255, 0.92);
  font-size: 1rem;
  font-weight: 500;
  letter-spacing: 0.06em;
}

.footer-desc {
  margin: 0.45rem 0 0;
  font-size: 0.88rem;
  color: var(--footer-muted);
}

.footer-meta {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.45rem;
  font-size: 0.88rem;
}

.footer-link,
.beian {
  color: var(--footer-muted);
  text-decoration: none;
  transition: color 0.2s ease;
}

.footer-link:hover,
.beian:hover {
  color: var(--white);
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(22px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes hero-zoom {
  from {
    transform: scale(1.12);
  }
  to {
    transform: scale(1.04);
  }
}

@keyframes veil-in {
  from {
    opacity: 0.4;
  }
  to {
    opacity: 1;
  }
}

@keyframes cue-pulse {
  0%,
  100% {
    transform: translateY(0);
    opacity: 0.35;
  }
  50% {
    transform: translateY(8px);
    opacity: 1;
  }
}

@media (max-width: 820px) {
  .service-band,
  .service-band.reverse {
    grid-template-columns: 1fr;
  }

  .service-band.reverse .service-visual,
  .service-band.reverse .service-copy {
    order: initial;
  }

  .service-visual img {
    min-height: 240px;
  }
}

@media (max-width: 640px) {
  .brand-zh {
    letter-spacing: 0.1em;
  }

  .footer-meta {
    align-items: flex-start;
  }
}

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

  .brand-en,
  .brand-zh,
  .hero-lead,
  .btn,
  .hero-media,
  .hero-veil,
  .scroll-cue,
  .section-head,
  .service-band,
  .service-visual,
  .service-visual img,
  .service-index,
  .service-copy h3,
  .service-copy p,
  .site-footer {
    animation: none !important;
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
    clip-path: none !important;
  }
}