:root {
  --ink: #172033;
  --muted: #5d675f;
  --paper: #f4f1ea;
  --card: #fffcf7;
  --line: #ddd6cb;
  --teal: #1c6b62;
  --teal-deep: #124941;
  --shadow: 0 18px 40px rgba(23, 32, 51, 0.06);
  --header: 72px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.7;
}

a { color: inherit; }

img { max-width: 100%; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header);
  padding: 0 7vw;
  background: rgba(244, 241, 234, 0.92);
  border-bottom: 1px solid transparent;
  backdrop-filter: blur(12px);
}

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

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-weight: 650;
  letter-spacing: 0.08em;
}

.brand-mark {
  display: grid;
  gap: 3px;
}

.brand-mark i {
  display: block;
  height: 3px;
  background: var(--teal);
  border-radius: 2px;
}

.brand-mark i:nth-child(1) { width: 18px; }
.brand-mark i:nth-child(2) { width: 13px; }
.brand-mark i:nth-child(3) { width: 8px; }

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

.site-nav a {
  text-decoration: none;
  color: var(--muted);
}

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

.nav-toggle {
  display: none;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--ink);
  border-radius: 999px;
  padding: 6px 14px;
  font: inherit;
  cursor: pointer;
}

main { padding: 0 7vw 80px; }

.eyebrow {
  margin: 0 0 14px;
  color: var(--teal);
  font-size: 13px;
  letter-spacing: 0.16em;
}

h1, h2, h3 { font-weight: 650; letter-spacing: -0.02em; }

.section-head { max-width: 720px; margin-bottom: 36px; }

h1, h2 {
  margin: 0;
  font-size: clamp(28px, 3vw, 40px);
  line-height: 1.3;
}

.about, .services, .contact {
  padding: 28px 0 20px;
  scroll-margin-top: 88px;
}

.about { padding-top: 56px; }

.about-text {
  max-width: 42em;
}

.about-text p { margin: 0 0 16px; color: #2c3646; }

.service-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin: 0;
  padding: 0;
}

.service-list li {
  min-height: 220px;
  padding: 24px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 18px;
}

.service-list span {
  color: var(--teal);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
}

.service-list h3 {
  margin: 18px 0 8px;
  font-size: 22px;
}

.service-list p {
  margin: 0;
  color: var(--muted);
}

.scope {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 32px;
  align-items: center;
  margin: 56px 0;
  padding: 36px 40px;
  border-radius: 24px;
  background: var(--ink);
  color: #f6f3ee;
}

.scope .eyebrow { color: #8dcec4; }

.scope h2 { font-size: 32px; }

.scope ul {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.scope li {
  padding: 8px 14px;
  border: 1px solid rgba(246, 243, 234, 0.22);
  border-radius: 999px;
}

.contact {
  padding-top: 8px;
  padding-bottom: 0;
}

.contact .eyebrow { margin-bottom: 8px; }

.contact-grid {
  display: grid;
  gap: 4px;
  margin: 0;
  padding-top: 8px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

.contact-grid p { margin: 0; }

.contact-grid span {
  display: inline-block;
  min-width: 2.5em;
  margin-right: 8px;
  color: var(--ink);
}

.contact-grid a {
  color: inherit;
  text-decoration: none;
}

.contact-grid a:hover { color: var(--teal); }

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 22px 7vw 28px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
}

.site-footer p { margin: 0; }

.site-footer a {
  color: inherit;
  text-decoration: none;
}

.site-footer a:hover { color: var(--ink); }

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

@media (max-width: 960px) {
  .scope,
  .service-list { grid-template-columns: 1fr; }

  .service-list { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 720px) {
  .site-header { padding: 0 20px; }
  main { padding: 0 20px 56px; }

  .nav-toggle { display: inline-flex; }

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

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

  .site-nav a { padding: 12px 0; border-top: 1px solid var(--line); }

  .service-list,
  .site-footer { grid-template-columns: 1fr; display: grid; }

  .service-list li { min-height: 0; }

  .scope { padding: 28px 22px; margin: 36px 0; }

  .site-footer { padding: 20px; }
}