:root {
  --paper: #f6f0e8;
  --paper-deep: #ebe3d6;
  --ink: #1e3a38;
  --ink-soft: rgba(30, 58, 56, 0.78);
  --copper: #a65d42;
  --gold: #c4a574;
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.75rem;
  --space-lg: 2.75rem;
  --space-xl: 4rem;
  --font-serif: "Songti SC", "Noto Serif SC", "STSong", "SimSun", serif;
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --text-base: 1rem;
  --text-sm: 0.9375rem;
  --text-lg: 1.125rem;
  --text-xl: clamp(1.75rem, 5vw, 2.35rem);
  --text-h2: clamp(1.45rem, 3.5vw, 1.85rem);
  --line: 1.75;
  --max-read: 42rem;
  --max-site: 72rem;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--line);
  color: var(--ink);
  background: var(--paper);
}

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

a {
  color: var(--copper);
}

a:focus-visible {
  outline: 2px solid var(--copper);
  outline-offset: 3px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(246, 240, 232, 0.92);
  border-bottom: 1px solid var(--gold);
  backdrop-filter: blur(6px);
}

.header-inner {
  max-width: var(--max-site);
  margin: 0 auto;
  padding: var(--space-sm) var(--space-md);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
}

.brand {
  font-family: var(--font-serif);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: 0.02em;
}

.nav-toggle {
  font: inherit;
  color: var(--ink);
  background: transparent;
  border: 1px solid var(--gold);
  padding: 0.35rem 0.75rem;
  cursor: pointer;
}

.site-nav {
  display: none;
  width: 100%;
  flex-direction: column;
  gap: var(--space-xs);
}

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

.site-nav a {
  position: relative;
  display: inline-block;
  padding: 0.25rem 0;
  color: var(--ink);
  text-decoration: none;
  font-size: var(--text-sm);
}

.site-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 100%;
  height: 3px;
  border-radius: 50%;
  border-bottom: 2px solid transparent;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.35s ease, border-color 0.35s ease;
}

.site-nav a.is-active::after {
  border-bottom-color: var(--copper);
  transform: scaleX(1);
  border-radius: 0 0 40% 40%;
}

main {
  overflow-x: hidden;
}

.hero {
  position: relative;
  padding: var(--space-lg) var(--space-md) var(--space-xl);
}

.hero-bg {
  position: absolute;
  inset: 0;
  overflow: hidden;
  opacity: 0.35;
  pointer-events: none;
}

.hero-bg img {
  width: 140%;
  max-width: none;
  animation: spine-drift 48s linear infinite;
}

@keyframes spine-drift {
  from {
    transform: translateX(0);
  }
  to {
    transform: translateX(-18%);
  }
}

.hero-layout {
  position: relative;
  max-width: var(--max-site);
  margin: 0 auto;
}

.hero h1 {
  margin: 0 0 var(--space-sm);
  font-family: var(--font-serif);
  font-size: var(--text-xl);
  font-weight: 700;
  line-height: 1.35;
  max-width: 12em;
}

.hero-hook {
  margin: 0 0 var(--space-sm);
  font-size: var(--text-lg);
  color: var(--ink);
  font-weight: 600;
  max-width: 22em;
}

.hero-sub {
  margin: 0 0 var(--space-md);
  color: var(--ink-soft);
  max-width: var(--max-read);
}

.hero-visual {
  margin: var(--space-lg) auto 0;
  max-width: 18rem;
}

.split-section,
.services,
.reasons {
  max-width: var(--max-site);
  margin: 0 auto;
  padding: var(--space-lg) var(--space-md) var(--space-xl);
}

.about h2,
.services h2,
.reasons h2 {
  margin: 0 0 var(--space-md);
  font-family: var(--font-serif);
  font-size: var(--text-h2);
  font-weight: 700;
}

.about-body {
  margin: 0;
  max-width: var(--max-read);
  color: var(--ink-soft);
}

.split-ornament {
  display: none;
}

.services {
  position: relative;
  border-top: 1px solid var(--gold);
}

.section-head {
  margin-bottom: var(--space-md);
}

.service-pages {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.page-segment {
  padding: var(--space-md) var(--space-md) var(--space-lg);
  background: transparent;
  border: none;
  border-left: 1px solid var(--gold);
  box-shadow: none;
}

.page-segment:nth-child(1) {
  padding-bottom: calc(var(--space-lg) + 0.5rem);
}

.page-segment:nth-child(3) {
  padding-top: calc(var(--space-lg) + 0.25rem);
  padding-bottom: var(--space-sm);
}

.segment-tall {
  padding-top: calc(var(--space-lg) + 1rem);
  padding-bottom: calc(var(--space-xl) + 2.5rem);
}

.segment-short {
  padding-top: var(--space-sm);
  padding-bottom: var(--space-xs);
}

.page-segment h3 {
  margin: 0 0 var(--space-xs);
  font-family: var(--font-serif);
  font-size: 1.25rem;
  color: var(--ink);
}

.segment-hook {
  margin: 0 0 var(--space-sm);
  font-weight: 600;
  color: var(--copper);
}

.segment-body {
  margin: 0;
  color: var(--ink-soft);
  font-size: var(--text-sm);
}

.services-ornament {
  display: none;
}

.reason-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  counter-reset: reason;
}

.reason-list li {
  padding: var(--space-md) 0;
  border-top: 1px solid var(--gold);
}

.reason-list h3 {
  margin: 0 0 var(--space-xs);
  font-family: var(--font-serif);
  font-size: 1.15rem;
}

.reason-list p {
  margin: 0;
  color: var(--ink-soft);
  max-width: var(--max-read);
}

.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}

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

.site-footer {
  text-align: center;
  padding: var(--space-lg) var(--space-md) var(--space-xl);
  border-top: 1px solid var(--gold);
  font-size: var(--text-sm);
  color: var(--ink-soft);
}

.site-footer p {
  margin: 0 0 var(--space-xs);
}

.beian a {
  color: var(--ink-soft);
  text-decoration: none;
}

.beian a:hover {
  color: var(--copper);
}

@media (min-width: 768px) {
  .nav-toggle {
    display: none;
  }

  .site-nav {
    display: flex;
    flex-direction: row;
    width: auto;
    gap: var(--space-md);
  }

  .split-section {
    display: grid;
    grid-template-columns: 1fr minmax(8rem, 12rem);
    gap: var(--space-lg);
    align-items: start;
  }

  .split-ornament {
    display: block;
    justify-self: end;
    opacity: 0.85;
  }

  .services {
    display: grid;
    grid-template-columns: 1fr minmax(6rem, 9rem);
    grid-template-rows: auto 1fr;
    gap: var(--space-md) var(--space-lg);
  }

  .section-head {
    grid-column: 1;
  }

  .service-pages {
    grid-column: 1;
  }

  .services-ornament {
    display: block;
    grid-column: 2;
    grid-row: 1 / span 2;
    align-self: center;
    opacity: 0.7;
  }

  .service-pages {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg) var(--space-xl);
    align-items: start;
  }

  .page-segment:nth-child(1) {
    min-height: 11rem;
    padding-bottom: var(--space-xl);
  }

  .page-segment:nth-child(3) {
    min-height: 9.5rem;
    margin-top: 1.75rem;
  }

  .segment-tall {
    min-height: 15.5rem;
    padding-top: calc(var(--space-xl) + 0.5rem);
    padding-bottom: calc(var(--space-xl) + 3rem);
  }

  .segment-short {
    min-height: 7.5rem;
    margin-top: -0.5rem;
    padding-top: var(--space-xs);
    padding-bottom: var(--space-sm);
  }

  .reason-list {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
  }

  .reason-list li {
    border-top: none;
    border-left: 1px solid var(--gold);
    padding: 0 var(--space-md);
  }

  .reason-list li:first-child {
    border-left: none;
    padding-left: 0;
  }
}

@media (min-width: 1100px) {
  .hero-layout {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: var(--space-xl);
    align-items: center;
  }

  .hero-visual {
    margin: 0;
    max-width: 26rem;
    justify-self: end;
  }
}