:root {
  --ink: #15202b;
  --ink-soft: #3d4a57;
  --paper: #f6f1e8;
  --paper-2: #efe7d8;
  --gold: #b58a3c;
  --gold-deep: #8c6828;
  --line: rgba(21, 32, 43, 0.12);
  --white: #fffdf8;
  --footer: #101820;
  --max: 1120px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(1200px 480px at 88% -10%, rgba(181, 138, 60, 0.16), transparent 55%),
    linear-gradient(180deg, #fbf7f0 0%, var(--paper) 38%, #f3ece0 100%);
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  line-height: 1.7;
}

img,
svg {
  display: block;
  max-width: 100%;
}

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

button {
  font: inherit;
}

.skip-link {
  position: absolute;
  left: 16px;
  top: -40px;
  z-index: 20;
  padding: 8px 12px;
  background: var(--ink);
  color: var(--paper);
}

.skip-link:focus {
  top: 12px;
}

.wrap {
  width: min(calc(100% - 40px), var(--max));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid transparent;
  background: rgba(251, 247, 240, 0.94);
  backdrop-filter: blur(16px);
}

.site-header.is-scrolled {
  border-bottom-color: var(--line);
  background: #fbf7f0;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand img {
  width: 36px;
  height: 36px;
  color: var(--ink);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand-text strong {
  font-size: 16px;
  letter-spacing: 0.08em;
}

.brand-text span {
  font-size: 11px;
  color: var(--ink-soft);
  letter-spacing: 0.16em;
}

.nav {
  display: flex;
  gap: 28px;
}

.nav a {
  position: relative;
  font-size: 14px;
  color: var(--ink-soft);
}

.nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -6px;
  width: 100%;
  height: 1px;
  background: var(--gold);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.28s var(--ease);
}

.nav a:hover,
.nav a:focus-visible {
  color: var(--ink);
}

.nav a:hover::after,
.nav a:focus-visible::after {
  transform: scaleX(1);
}

.menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  background: transparent;
  cursor: pointer;
}

.menu-toggle span,
.menu-toggle span::before,
.menu-toggle span::after {
  display: block;
  width: 18px;
  height: 1.5px;
  margin: 0 auto;
  background: var(--ink);
}

.menu-toggle span {
  position: relative;
}

.menu-toggle span::before,
.menu-toggle span::after {
  content: "";
  position: absolute;
  left: 0;
}

.menu-toggle span::before {
  top: -6px;
}

.menu-toggle span::after {
  top: 6px;
}

.hero {
  padding: 72px 0 28px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: end;
}

.kicker {
  margin: 0 0 18px;
  color: var(--gold-deep);
  letter-spacing: 0.28em;
  font-size: 12px;
}

.hero h1 {
  margin: 0;
  font-size: clamp(36px, 6vw, 68px);
  line-height: 1.08;
  letter-spacing: 0.04em;
  font-weight: 600;
}

.hero-lead {
  max-width: 38em;
  margin: 22px 0 0;
  font-size: 18px;
  color: var(--ink-soft);
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 18px 32px;
  margin-top: 36px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}

.hero-meta div {
  min-width: 180px;
}

.hero-meta dt {
  margin: 0;
  font-size: 12px;
  color: var(--gold-deep);
  letter-spacing: 0.12em;
}

.hero-meta dd {
  margin: 4px 0 0;
  font-size: 15px;
}

.hero-panel {
  position: relative;
  min-height: 340px;
  padding: 28px;
  background:
    linear-gradient(160deg, rgba(21, 32, 43, 0.94), rgba(21, 32, 43, 0.82)),
    repeating-linear-gradient(
      135deg,
      rgba(196, 163, 90, 0.08) 0 10px,
      transparent 10px 20px
    );
  color: var(--paper);
  overflow: hidden;
}

.hero-panel::after {
  content: "";
  position: absolute;
  right: -40px;
  bottom: -40px;
  width: 180px;
  height: 180px;
  border: 1px solid rgba(196, 163, 90, 0.45);
  transform: rotate(18deg);
}

.hero-panel p {
  position: relative;
  z-index: 1;
  margin: 0;
  max-width: 18em;
  font-size: 20px;
  line-height: 1.6;
}

.hero-panel span {
  position: relative;
  z-index: 1;
  display: block;
  margin-top: 86px;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: rgba(246, 241, 232, 0.62);
}

section {
  padding: 84px 0;
}

.section-head {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 32px;
  margin-bottom: 40px;
  align-items: baseline;
}

.section-head h2 {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.24em;
  color: var(--gold-deep);
  font-weight: 500;
}

.section-head p {
  margin: 0;
  font-size: 28px;
  line-height: 1.35;
}

.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 48px;
}

.about-copy p {
  margin: 0 0 18px;
  color: var(--ink-soft);
  font-size: 16px;
}

.facts {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.facts div {
  padding: 18px 20px;
  background: var(--white);
}

.facts dt {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--gold-deep);
}

.facts dd {
  margin: 6px 0 0;
  font-size: 16px;
}

.work-list {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.work-item {
  display: grid;
  grid-template-columns: 88px 200px 1fr;
  gap: 24px;
  padding: 28px 0;
  border-bottom: 1px solid var(--line);
}

.work-item strong {
  font-size: 13px;
  letter-spacing: 0.18em;
  color: var(--gold-deep);
  font-weight: 500;
}

.work-item h3 {
  margin: 0;
  font-size: 22px;
  font-weight: 600;
}

.work-item p {
  margin: 0;
  color: var(--ink-soft);
}

.beian-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.beian-card article {
  padding: 28px;
  background: var(--white);
}

.beian-card h3 {
  margin: 0 0 8px;
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--gold-deep);
  font-weight: 500;
}

.beian-card p,
.beian-card a {
  margin: 0;
  font-size: 20px;
}

.beian-card a {
  color: var(--ink);
  border-bottom: 1px solid var(--gold);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}

.contact-note {
  margin: 0;
  color: var(--ink-soft);
}

.site-footer {
  padding: 48px 0 32px;
  background: var(--footer);
  color: #d8d2c6;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 40px;
  padding-bottom: 28px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.site-footer h2 {
  margin: 0 0 8px;
  color: #fff8ea;
  font-size: 20px;
}

.site-footer p,
.site-footer li {
  margin: 0;
  font-size: 14px;
  color: #b7b1a6;
}

.footer-meta {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-meta span {
  display: block;
  color: #8f877a;
  font-size: 12px;
  letter-spacing: 0.08em;
}

.footer-meta a {
  color: #efe4cc;
  border-bottom: 1px solid rgba(196, 163, 90, 0.7);
}

.copyright {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  padding-top: 18px;
  font-size: 13px;
  color: #8f877a;
}

.icp-line {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  align-items: center;
}

@media (max-width: 860px) {
  .menu-toggle {
    display: block;
  }

  .nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 72px;
    display: none;
    flex-direction: column;
    gap: 0;
    padding: 8px 20px 16px;
    background: #fbf7f0;
    border-bottom: 1px solid var(--line);
  }

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

  .nav a {
    padding: 12px 0;
  }

  .hero-grid,
  .about-grid,
  .section-head,
  .beian-card,
  .contact-grid,
  .footer-grid,
  .work-item {
    grid-template-columns: 1fr;
  }

  .hero-panel {
    min-height: 220px;
  }

  .hero-panel span {
    margin-top: 36px;
  }

  section {
    padding: 64px 0;
  }
}

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

  .nav a::after {
    transition: none;
  }
}