:root {
  --ink: #102d2b;
  --ink-deep: #071d1c;
  --ink-soft: #274845;
  --mist: #aebebb;
  --mist-light: #dce5e2;
  --pearl: #f1f2eb;
  --pearl-dim: #d4d8cf;
  --gold: #c9a55b;
  --gold-bright: #e1c77f;
  --line-dark: rgba(16, 45, 43, 0.2);
  --line-light: rgba(241, 242, 235, 0.2);
  --font-serif: "Songti SC", "Noto Serif SC", "STSong", "SimSun", serif;
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --space-xs: clamp(0.5rem, 0.4rem + 0.3vw, 0.75rem);
  --space-sm: clamp(0.875rem, 0.7rem + 0.5vw, 1.25rem);
  --space-md: clamp(1.5rem, 1.1rem + 1vw, 2.5rem);
  --space-lg: clamp(3rem, 2rem + 3vw, 6rem);
  --space-xl: clamp(5rem, 3rem + 6vw, 10rem);
  --page-gutter: clamp(1rem, 2.6vw, 3.5rem);
  --content-max: 92rem;
  --header-height: 4.75rem;
  --text-xs: clamp(0.72rem, 0.68rem + 0.12vw, 0.8rem);
  --text-sm: clamp(0.88rem, 0.82rem + 0.2vw, 1rem);
  --text-base: clamp(1rem, 0.92rem + 0.25vw, 1.14rem);
  --text-md: clamp(1.25rem, 1.05rem + 0.75vw, 1.85rem);
  --text-lg: clamp(2rem, 1.4rem + 2.2vw, 4rem);
  --text-hero: clamp(3rem, 1.8rem + 5vw, 7.5rem);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 1rem);
}

body {
  margin: 0;
  min-width: 20rem;
  overflow-x: hidden;
  color: var(--ink);
  background: var(--pearl);
  font-family: var(--font-sans);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

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

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button:focus-visible,
a:focus-visible {
  outline: 2px solid var(--gold-bright);
  outline-offset: 4px;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

.site-header {
  position: fixed;
  z-index: 50;
  top: 0;
  left: 0;
  display: flex;
  width: 100%;
  height: var(--header-height);
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  padding: 0 var(--page-gutter);
  border-bottom: 1px solid rgba(241, 242, 235, 0.12);
  color: var(--pearl);
  background: rgba(7, 29, 28, 0.78);
  backdrop-filter: blur(16px);
  transition: background-color 240ms ease, border-color 240ms ease;
}

.site-header.is-scrolled {
  border-bottom-color: rgba(201, 165, 91, 0.28);
  background: rgba(7, 29, 28, 0.94);
}

.brand {
  display: inline-flex;
  min-width: 0;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-serif);
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  white-space: nowrap;
}

.brand-mark {
  position: relative;
  display: inline-block;
  width: 1.55rem;
  height: 1.55rem;
  flex: 0 0 auto;
  transform: rotate(45deg);
  border: 1px solid var(--gold);
}

.brand-mark::before,
.brand-mark::after {
  position: absolute;
  content: "";
  background: var(--gold);
}

.brand-mark::before {
  top: 50%;
  left: -0.35rem;
  width: 2.2rem;
  height: 1px;
}

.brand-mark::after {
  top: -0.35rem;
  left: 50%;
  width: 1px;
  height: 2.2rem;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(1.2rem, 2.2vw, 3rem);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
}

.site-nav a {
  position: relative;
  display: inline-flex;
  min-height: 2.75rem;
  align-items: center;
  white-space: nowrap;
}

.site-nav a::after {
  position: absolute;
  right: 0;
  bottom: 0.45rem;
  left: 0;
  height: 1px;
  content: "";
  background: var(--gold);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 220ms ease;
}

.site-nav a:hover::after,
.site-nav a.is-active::after {
  transform: scaleX(1);
  transform-origin: left;
}

.nav-toggle {
  display: none;
  width: 2.75rem;
  height: 2.75rem;
  padding: 0.75rem;
  border: 0;
  color: inherit;
  background: transparent;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 100%;
  height: 1px;
  margin: 0.4rem 0;
  background: currentColor;
  transition: transform 220ms ease;
}

.nav-toggle[aria-expanded="true"] span:first-child {
  transform: translateY(0.2rem) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span:last-child {
  transform: translateY(-0.2rem) rotate(-45deg);
}

.hero {
  position: relative;
  display: grid;
  min-height: 100svh;
  overflow: hidden;
  align-items: end;
  padding: calc(var(--header-height) + var(--space-xl)) var(--page-gutter) var(--space-lg);
  color: var(--pearl);
  background:
    linear-gradient(120deg, rgba(7, 29, 28, 0.96) 0%, rgba(16, 45, 43, 0.94) 52%, rgba(39, 72, 69, 0.78) 100%),
    var(--ink-deep);
}

.hero::before {
  position: absolute;
  inset: 0;
  content: "";
  opacity: 0.3;
  background-image:
    linear-gradient(rgba(241, 242, 235, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(241, 242, 235, 0.04) 1px, transparent 1px);
  background-size: 4.5rem 4.5rem;
  mask-image: linear-gradient(to bottom, transparent 5%, black 70%);
}

.hero-copy {
  position: relative;
  z-index: 2;
  width: min(52rem, 70vw);
}

.hero-kicker {
  max-width: 30rem;
  margin-bottom: var(--space-md);
  color: var(--gold-bright);
  font-size: var(--text-sm);
  letter-spacing: 0.1em;
}

.hero h1 {
  max-width: 11ch;
  margin-bottom: var(--space-md);
  font-family: var(--font-serif);
  font-size: var(--text-hero);
  font-weight: 400;
  letter-spacing: -0.04em;
  line-height: 1.12;
  text-wrap: balance;
}

.hero-summary {
  max-width: 38rem;
  margin-bottom: var(--space-md);
  color: var(--pearl-dim);
  font-size: var(--text-base);
}

.text-link {
  display: inline-flex;
  min-height: 3rem;
  align-items: center;
  gap: 1rem;
  padding: 0.25rem 0;
  border-bottom: 1px solid var(--gold);
  color: var(--pearl);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
}

.text-link span {
  color: var(--gold-bright);
  transition: transform 220ms ease;
}

.text-link:hover span {
  transform: translate(0.25rem, 0.25rem);
}

.rain-stage {
  position: absolute;
  z-index: 1;
  top: calc(var(--header-height) + 6vh);
  right: clamp(-8rem, -4vw, -2rem);
  width: min(46vw, 42rem);
  aspect-ratio: 0.84;
}

.rain-line {
  position: absolute;
  top: -18%;
  width: 1px;
  height: 95%;
  opacity: 0.48;
  background: linear-gradient(to bottom, transparent, var(--mist), transparent);
  animation: rain-trace 8s linear infinite;
}

.rain-line-a {
  left: 19%;
}

.rain-line-b {
  left: 52%;
  animation-delay: -2.6s;
  animation-duration: 10s;
}

.rain-line-c {
  left: 81%;
  animation-delay: -5s;
  animation-duration: 7s;
}

.facet {
  position: absolute;
  border: 1px solid rgba(225, 199, 127, 0.55);
  background: linear-gradient(145deg, rgba(225, 199, 127, 0.1), rgba(174, 190, 187, 0.02));
  clip-path: polygon(50% 0, 100% 38%, 77% 100%, 19% 83%, 0 31%);
  animation: facet-breathe 7s ease-in-out infinite;
}

.facet::before,
.facet::after {
  position: absolute;
  content: "";
  background: rgba(225, 199, 127, 0.35);
  transform-origin: left;
}

.facet::before {
  top: 38%;
  left: 0;
  width: 100%;
  height: 1px;
  transform: rotate(19deg);
}

.facet::after {
  top: 0;
  left: 50%;
  width: 1px;
  height: 100%;
  transform: rotate(12deg);
}

.facet-a {
  top: 9%;
  right: 4%;
  width: 65%;
  aspect-ratio: 1;
}

.facet-b {
  right: 39%;
  bottom: 3%;
  width: 36%;
  aspect-ratio: 1;
  animation-delay: -2.4s;
}

.facet-c {
  right: -3%;
  bottom: 12%;
  width: 27%;
  aspect-ratio: 1;
  animation-delay: -4.5s;
}

.light-point {
  position: absolute;
  top: 31%;
  right: 32%;
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: var(--gold-bright);
  box-shadow: 0 0 0 0.7rem rgba(225, 199, 127, 0.08), 0 0 3rem 1rem rgba(225, 199, 127, 0.24);
}

.section-shell {
  width: min(calc(100% - 2 * var(--page-gutter)), var(--content-max));
  margin-inline: auto;
}

.services,
.advantages {
  padding-block: var(--space-xl);
}

.section-heading {
  display: grid;
  grid-template-columns: 3rem 1fr;
  align-items: baseline;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
}

.section-heading h2 {
  margin: 0;
  font-family: var(--font-serif);
  font-size: var(--text-lg);
  font-weight: 400;
  letter-spacing: 0.04em;
  line-height: 1.2;
}

.section-index,
.item-number {
  color: var(--gold);
  font-size: var(--text-xs);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.14em;
}

.service-path {
  position: relative;
  border-top: 1px solid var(--line-dark);
}

.service-path::before {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 2.2rem;
  width: 1px;
  content: "";
  background: linear-gradient(to bottom, var(--gold), rgba(201, 165, 91, 0));
}

.service-item {
  position: relative;
  display: grid;
  grid-template-columns: 4.4rem minmax(12rem, 0.8fr) minmax(18rem, 1.2fr);
  gap: var(--space-md);
  align-items: start;
  padding: var(--space-lg) 0;
  border-bottom: 1px solid var(--line-dark);
}

.service-item:nth-child(even) {
  margin-left: clamp(0rem, 5vw, 6rem);
}

.service-item .item-number {
  position: relative;
  padding-top: 0.35rem;
}

.service-item .item-number::after {
  position: absolute;
  top: 0.45rem;
  left: 2rem;
  width: 0.45rem;
  height: 0.45rem;
  border-radius: 50%;
  content: "";
  background: var(--gold);
  box-shadow: 0 0 0 0.35rem var(--pearl);
}

.service-title h3 {
  margin-bottom: 0.5rem;
  font-family: var(--font-serif);
  font-size: var(--text-md);
  font-weight: 400;
  line-height: 1.35;
}

.service-title p {
  margin: 0;
  color: var(--ink-soft);
  font-size: var(--text-sm);
}

.service-detail {
  max-width: 39rem;
  margin: 0;
  color: var(--ink-soft);
  font-size: var(--text-base);
}

.about {
  position: relative;
  overflow: hidden;
  padding-block: var(--space-xl);
  color: var(--pearl);
  background: var(--ink);
}

.about::before,
.about::after {
  position: absolute;
  content: "";
  border: 1px solid rgba(201, 165, 91, 0.24);
  transform: rotate(45deg);
}

.about::before {
  top: -12rem;
  right: 7vw;
  width: 23rem;
  height: 23rem;
}

.about::after {
  right: 22vw;
  bottom: -10rem;
  width: 14rem;
  height: 14rem;
}

.about-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(12rem, 0.65fr) minmax(20rem, 1.35fr);
  gap: var(--space-lg);
  align-items: start;
}

.section-heading-light {
  margin: 0;
}

.about-inner > p {
  max-width: 55rem;
  margin: 0;
  color: var(--pearl-dim);
  font-family: var(--font-serif);
  font-size: clamp(1.18rem, 0.95rem + 0.8vw, 1.85rem);
  line-height: 1.9;
  text-align: justify;
}

.advantages {
  position: relative;
}

.advantage-list {
  border-top: 1px solid var(--line-dark);
}

.advantage-item {
  display: grid;
  grid-template-columns: 4.4rem minmax(11rem, 0.65fr) minmax(18rem, 1.35fr);
  gap: var(--space-md);
  align-items: baseline;
  padding: var(--space-md) clamp(0rem, 4vw, 4rem);
  border-bottom: 1px solid var(--line-dark);
  transition: color 220ms ease, background-color 220ms ease, transform 220ms ease;
}

.advantage-item:nth-child(even) {
  transform: translateX(clamp(0rem, 2.5vw, 2.5rem));
}

.advantage-item:hover {
  color: var(--pearl);
  background: var(--ink);
}

.advantage-item h3 {
  margin: 0;
  font-family: var(--font-serif);
  font-size: var(--text-md);
  font-weight: 400;
}

.advantage-item p {
  max-width: 45rem;
  margin: 0;
  color: var(--ink-soft);
  font-size: var(--text-sm);
}

.advantage-item:hover p {
  color: var(--pearl-dim);
}

.site-footer {
  display: flex;
  min-height: 9rem;
  align-items: center;
  justify-content: center;
  gap: 0.7rem 1.5rem;
  padding: var(--space-md) var(--page-gutter);
  border-top: 1px solid rgba(241, 242, 235, 0.12);
  color: var(--mist-light);
  background: var(--ink-deep);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  text-align: center;
}

.site-footer p {
  margin: 0;
}

.site-footer a {
  display: inline-flex;
  min-height: 2.75rem;
  align-items: center;
  justify-content: center;
  border-bottom: 1px solid transparent;
}

.site-footer a:hover {
  border-bottom-color: var(--gold);
}

.js .reveal {
  opacity: 0;
  transform: translateY(2rem);
  transition: opacity 720ms ease, transform 720ms ease;
}

.js .reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@keyframes rain-trace {
  0% {
    transform: translateY(-12%);
  }
  100% {
    transform: translateY(32%);
  }
}

@keyframes facet-breathe {
  0%,
  100% {
    opacity: 0.45;
    transform: translateY(0) rotate(0deg);
  }
  50% {
    opacity: 0.8;
    transform: translateY(-0.7rem) rotate(1deg);
  }
}

@media (max-width: 767px) {
  :root {
    --header-height: 4.25rem;
  }

  .brand-name {
    overflow: hidden;
    max-width: calc(100vw - 7rem);
    text-overflow: ellipsis;
  }

  .nav-toggle {
    display: block;
    flex: 0 0 auto;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    right: var(--page-gutter);
    display: grid;
    width: min(17rem, calc(100vw - 2 * var(--page-gutter)));
    gap: 0;
    padding: 0.55rem 1rem;
    border: 1px solid rgba(201, 165, 91, 0.3);
    background: rgba(7, 29, 28, 0.98);
    opacity: 0;
    pointer-events: none;
    transform: translateY(-0.75rem);
    transition: opacity 180ms ease, transform 180ms ease;
  }

  .site-nav.is-open {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }

  .site-nav a {
    min-height: 3rem;
    border-bottom: 1px solid rgba(241, 242, 235, 0.1);
  }

  .site-nav a:last-child {
    border-bottom: 0;
  }

  .site-nav a::after {
    display: none;
  }

  .hero {
    min-height: max(43rem, 100svh);
    padding-bottom: var(--space-lg);
  }

  .hero-copy {
    width: 100%;
  }

  .hero h1 {
    font-size: clamp(2.7rem, 14vw, 4.6rem);
  }

  .hero-summary {
    max-width: 28rem;
  }

  .rain-stage {
    top: 14%;
    right: -38%;
    width: min(92vw, 32rem);
    opacity: 0.55;
  }

  .section-heading {
    grid-template-columns: 2.4rem 1fr;
  }

  .service-path::before {
    left: 1.1rem;
  }

  .service-item,
  .advantage-item {
    grid-template-columns: 2.4rem 1fr;
    gap: var(--space-sm);
  }

  .service-item:nth-child(even) {
    margin-left: 0;
  }

  .service-item .item-number::after {
    left: 0.9rem;
  }

  .service-detail,
  .advantage-item p {
    grid-column: 2;
  }

  .about-inner {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  .about-inner > p {
    text-align: left;
  }

  .advantage-item {
    padding: var(--space-md) 0;
  }

  .advantage-item:nth-child(even) {
    transform: none;
  }

  .site-footer {
    flex-direction: column;
    gap: 0.15rem;
  }
}

@media (orientation: landscape) and (max-height: 500px) {
  :root {
    --header-height: 3.6rem;
  }

  .hero {
    min-height: 32rem;
    align-items: start;
    padding-top: calc(var(--header-height) + 3.5rem);
    padding-bottom: 2.5rem;
  }

  .hero-copy {
    width: min(72%, 42rem);
  }

  .hero-kicker,
  .hero h1 {
    margin-bottom: 1rem;
  }

  .hero h1 {
    font-size: clamp(2.5rem, 8vw, 4.2rem);
  }

  .hero-summary {
    margin-bottom: 1rem;
    font-size: 0.95rem;
    line-height: 1.6;
  }

  .rain-stage {
    top: 2rem;
    right: -2rem;
    width: min(42vw, 22rem);
  }

  .services,
  .advantages,
  .about {
    padding-block: 4rem;
  }
}

@media (min-width: 768px) {
  .hero {
    grid-template-columns: minmax(25rem, 1.2fr) minmax(18rem, 0.8fr);
  }

  .hero-copy {
    width: min(48rem, 64vw);
  }

  .service-item:nth-child(2) .service-title,
  .service-item:nth-child(4) .service-title {
    padding-left: clamp(0rem, 2vw, 2rem);
  }
}

@media (min-width: 1100px) {
  :root {
    --header-height: 5.25rem;
  }

  .hero {
    padding-bottom: clamp(5rem, 9vh, 8rem);
  }

  .hero-copy {
    margin-left: clamp(0rem, 3vw, 4rem);
  }

  .service-item {
    grid-template-columns: 5rem minmax(16rem, 0.8fr) minmax(24rem, 1.2fr);
  }

  .advantages .section-heading {
    margin-left: clamp(0rem, 7vw, 8rem);
  }
}

@media (min-width: 1440px) {
  :root {
    --page-gutter: clamp(3.5rem, 4vw, 6rem);
  }

  .site-header {
    padding-inline: max(var(--page-gutter), calc((100vw - 104rem) / 2));
  }

  .hero {
    padding-inline: max(var(--page-gutter), calc((100vw - 104rem) / 2));
  }

  .rain-stage {
    right: max(2rem, calc((100vw - 104rem) / 2));
  }

  .service-item {
    grid-template-columns: 6rem minmax(20rem, 0.75fr) minmax(26rem, 1.25fr);
  }
}

@media (min-aspect-ratio: 2/1) {
  .hero {
    min-height: min(45rem, calc(100svh - 1rem));
    padding-top: calc(var(--header-height) + 4rem);
    padding-bottom: 4rem;
  }

  .rain-stage {
    top: calc(var(--header-height) + 1rem);
    width: min(34vw, 34rem);
  }

  .services,
  .advantages,
  .about {
    padding-block: clamp(4rem, 7vw, 7rem);
  }
}

@media (max-aspect-ratio: 3/4) {
  .hero {
    min-height: 88svh;
    align-items: end;
  }

  .rain-stage {
    top: 13%;
    right: -31%;
    width: min(86vw, 34rem);
  }

  .hero-copy {
    padding-bottom: 2svh;
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}