:root {
  color: #1b1d1d;
  background: #f5f7f6;
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    "PingFang SC", "Microsoft YaHei", sans-serif;
  --ink: #1b1d1d;
  --muted: #56625f;
  --line: #d2ddd9;
  --paper: #ffffff;
  --green: #176b5d;
  --green-soft: rgba(23, 107, 93, 0.1);
  --surface: #eef3f1;
  --shadow: 0 18px 50px rgba(26, 38, 34, 0.1);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  background:
    radial-gradient(circle at 78% 6%, rgba(23, 107, 93, 0.11), transparent 30vw),
    linear-gradient(180deg, #f9fbfa 0%, #f1f5f3 54%, #f8faf9 100%);
  color: var(--ink);
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 70px;
  padding: 14px clamp(20px, 5vw, 76px);
  border-bottom: 1px solid rgba(210, 221, 217, 0.72);
  background: rgba(248, 250, 249, 0.88);
  backdrop-filter: blur(18px);
}

.brand,
.site-header nav,
.hero-actions,
footer {
  display: flex;
  align-items: center;
}

.brand {
  gap: 10px;
  font-size: 17px;
  font-weight: 800;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: var(--green);
  color: #fff;
  font-weight: 900;
}

.site-header nav {
  gap: 26px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}

.site-header nav a:hover {
  color: var(--green);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 420px);
  gap: clamp(28px, 6vw, 86px);
  align-items: center;
  min-height: calc(100vh - 70px);
  padding: clamp(58px, 8vw, 112px) clamp(20px, 5vw, 76px);
}

.hero-copy {
  max-width: 760px;
}

.eyebrow {
  color: var(--green);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

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

h1 {
  margin-top: 18px;
  max-width: 820px;
  font-size: clamp(40px, 5.6vw, 76px);
  font-weight: 820;
  line-height: 1.06;
}

h2 {
  font-size: clamp(30px, 4vw, 50px);
  font-weight: 780;
  line-height: 1.12;
}

h3 {
  font-size: 21px;
  font-weight: 760;
  line-height: 1.24;
}

.hero-copy p,
.section-heading p,
.note-grid p,
.project-card p,
.about p,
.notice-card p {
  color: var(--muted);
  font-size: 17px;
  font-weight: 510;
  line-height: 1.78;
}

.hero-copy p {
  margin-top: 24px;
  max-width: 690px;
}

.hero-actions {
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.primary-action,
.secondary-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 22px;
  border-radius: 12px;
  font-size: 14px;
  font-weight: 800;
  transition:
    transform 0.18s ease,
    box-shadow 0.18s ease,
    border-color 0.18s ease;
}

.primary-action {
  background: var(--green);
  color: #fff;
  box-shadow: 0 14px 30px rgba(23, 107, 93, 0.2);
}

.secondary-action {
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.72);
  color: var(--ink);
}

.primary-action:hover,
.secondary-action:hover {
  transform: translateY(-1px);
}

.notice-card {
  padding: 30px;
  border: 1px solid rgba(210, 221, 217, 0.92);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.86);
  box-shadow: var(--shadow);
}

.notice-card strong,
.notice-card span {
  display: block;
}

.notice-card strong {
  color: var(--muted);
  font-size: 13px;
  font-weight: 820;
}

.notice-card span {
  margin-top: 12px;
  color: var(--green);
  font-size: 26px;
  font-weight: 850;
  line-height: 1.24;
}

.notice-card p {
  margin-top: 18px;
  font-size: 15px;
}

.section {
  padding: 92px clamp(20px, 5vw, 76px);
}

.section-heading {
  max-width: 860px;
  margin-bottom: 34px;
}

.section-heading h2 {
  margin-top: 12px;
}

.section-heading p {
  margin-top: 14px;
}

.note-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.note-grid article,
.project-card {
  border: 1px solid rgba(210, 221, 217, 0.9);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.82);
  box-shadow: 0 10px 34px rgba(26, 38, 34, 0.07);
}

.note-grid article {
  min-height: 260px;
  padding: 26px;
}

.note-grid span,
.project-label {
  color: var(--green);
  font-size: 13px;
  font-weight: 900;
}

.note-grid h3 {
  margin-top: 74px;
}

.note-grid p {
  margin-top: 12px;
  font-size: 15px;
  line-height: 1.68;
}

.projects {
  background: var(--surface);
}

.project-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  max-width: 900px;
  padding: 28px;
  transition:
    transform 0.18s ease,
    box-shadow 0.18s ease,
    border-color 0.18s ease;
}

.project-card:hover {
  transform: translateY(-2px);
  border-color: rgba(23, 107, 93, 0.28);
  box-shadow: var(--shadow);
}

.project-card h3 {
  margin-top: 10px;
}

.project-card p {
  margin-top: 10px;
  max-width: 620px;
  font-size: 15px;
}

.project-link {
  flex: 0 0 auto;
  color: var(--green);
  font-size: 14px;
  font-weight: 850;
}

.about {
  display: grid;
  grid-template-columns: minmax(260px, 0.45fr) minmax(0, 1fr);
  gap: 42px;
  align-items: start;
}

.about h2 {
  margin-top: 12px;
}

.about p {
  padding: 28px;
  border-left: 4px solid var(--green);
  border-radius: 0 14px 14px 0;
  background: var(--green-soft);
}

footer {
  justify-content: space-between;
  gap: 16px;
  padding: 28px clamp(20px, 5vw, 76px);
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
  font-weight: 750;
}

@media (max-width: 900px) {
  .hero,
  .about {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
  }

  .note-grid {
    grid-template-columns: 1fr;
  }

  .note-grid article {
    min-height: 220px;
  }

  .note-grid h3 {
    margin-top: 46px;
  }
}

@media (max-width: 680px) {
  .site-header {
    position: static;
    align-items: flex-start;
    flex-direction: column;
  }

  .site-header nav {
    flex-wrap: wrap;
    gap: 14px;
  }

  h1 {
    font-size: 38px;
  }

  h2 {
    font-size: 30px;
  }

  .hero,
  .section {
    padding-left: 20px;
    padding-right: 20px;
  }

  .project-card,
  footer {
    align-items: flex-start;
    flex-direction: column;
  }
}