:root {
  --ink: #14241f;
  --ink-soft: #3d5249;
  --green: #1b7a55;
  --green-deep: #0f4d36;
  --mint: #c8ebd8;
  --mint-soft: #e8f6ee;
  --fog: #f4faf7;
  --line: rgba(20, 36, 31, 0.1);
  --white: #ffffff;
  --max: 1120px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: "Noto Sans SC", "Source Sans 3", sans-serif;
  font-weight: 400;
  line-height: 1.7;
  background:
    radial-gradient(1200px 600px at 90% -10%, rgba(200, 235, 216, 0.55), transparent 60%),
    radial-gradient(900px 500px at -10% 20%, rgba(232, 246, 238, 0.9), transparent 55%),
    var(--fog);
}

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

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

.container {
  width: min(100% - 2.5rem, var(--max));
  margin-inline: auto;
}

/* Nav */
.site-nav {
  position: fixed;
  inset: 0 0 auto;
  z-index: 50;
  backdrop-filter: blur(14px);
  background: rgba(244, 250, 247, 0.78);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s var(--ease), background 0.3s var(--ease);
}

.site-nav.is-scrolled {
  border-bottom-color: var(--line);
  background: rgba(255, 255, 255, 0.9);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 4.25rem;
}

.brand {
  display: flex;
  flex-direction: column;
  gap: 0.05rem;
  line-height: 1.2;
}

.brand-cn {
  font-family: "Noto Serif SC", "Songti SC", serif;
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.brand-en {
  font-family: "Syne", sans-serif;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--green);
}

.nav-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  font-size: 0.92rem;
  color: var(--ink-soft);
  position: relative;
  transition: color 0.25s var(--ease);
}

.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.3rem;
  width: 100%;
  height: 2px;
  background: var(--green);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s var(--ease);
}

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

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

.nav-toggle {
  display: none;
  width: 2.5rem;
  height: 2.5rem;
  border: 1px solid var(--line);
  border-radius: 0.5rem;
  background: var(--white);
  cursor: pointer;
  padding: 0;
}

.nav-toggle span {
  display: block;
  width: 1.1rem;
  height: 2px;
  margin: 0.28rem auto;
  background: var(--ink);
}

/* Hero */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;
  display: grid;
  align-items: end;
  overflow: hidden;
  color: var(--white);
}

.hero-media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 40%;
  transform: scale(1.04);
  animation: heroZoom 12s var(--ease) forwards;
}

.hero-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(15, 40, 30, 0.35) 0%, rgba(10, 28, 22, 0.55) 45%, rgba(8, 22, 18, 0.82) 100%),
    linear-gradient(90deg, rgba(8, 22, 18, 0.55) 0%, transparent 55%);
}

.hero-content {
  position: relative;
  z-index: 1;
  padding: 8rem 0 4.5rem;
  max-width: 38rem;
}

.hero-brand {
  font-family: "Noto Serif SC", serif;
  font-size: clamp(2.4rem, 6vw, 3.6rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: 0.06em;
  margin: 0 0 1rem;
  opacity: 0;
  animation: riseIn 0.9s var(--ease) 0.15s forwards;
}

.hero-title {
  font-family: "Syne", sans-serif;
  font-size: clamp(1.15rem, 2.4vw, 1.45rem);
  font-weight: 600;
  letter-spacing: 0.02em;
  margin: 0 0 0.85rem;
  opacity: 0;
  animation: riseIn 0.9s var(--ease) 0.3s forwards;
}

.hero-lead {
  margin: 0 0 1.75rem;
  color: rgba(255, 255, 255, 0.86);
  font-size: 1.02rem;
  max-width: 32rem;
  opacity: 0;
  animation: riseIn 0.9s var(--ease) 0.45s forwards;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  opacity: 0;
  animation: riseIn 0.9s var(--ease) 0.6s forwards;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.9rem;
  padding: 0 1.35rem;
  border-radius: 999px;
  font-size: 0.95rem;
  font-weight: 600;
  transition: transform 0.25s var(--ease), background 0.25s var(--ease), color 0.25s var(--ease), border-color 0.25s var(--ease);
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  background: var(--mint);
  color: var(--green-deep);
}

.btn-primary:hover {
  background: var(--white);
}

.btn-ghost {
  border: 1px solid rgba(255, 255, 255, 0.45);
  color: var(--white);
  background: transparent;
}

.btn-ghost:hover {
  border-color: var(--white);
  background: rgba(255, 255, 255, 0.08);
}

/* Sections */
.section {
  padding: 5.5rem 0;
}

.section-head {
  max-width: 36rem;
  margin-bottom: 2.75rem;
}

.section-kicker {
  font-family: "Syne", sans-serif;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--green);
  margin: 0 0 0.65rem;
}

.section-title {
  font-family: "Noto Serif SC", serif;
  font-size: clamp(1.7rem, 3.2vw, 2.25rem);
  font-weight: 700;
  line-height: 1.3;
  margin: 0 0 0.75rem;
  letter-spacing: 0.03em;
}

.section-desc {
  margin: 0;
  color: var(--ink-soft);
  font-size: 1.02rem;
}

/* About */
.about-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 3rem;
  align-items: center;
}

.about-copy p {
  margin: 0 0 1.1rem;
  color: var(--ink-soft);
}

.about-copy p:last-child {
  margin-bottom: 0;
}

.about-highlights {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.85rem;
  margin-top: 1.75rem;
}

.about-highlights span {
  padding: 0.75rem 0.9rem;
  background: var(--white);
  border: 1px solid var(--line);
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--green-deep);
}

.about-visual {
  position: relative;
}

.about-visual img {
  width: 100%;
  height: auto;
  mix-blend-mode: multiply;
}

.pillars {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
  margin-top: 2.5rem;
}

.pillar h3 {
  font-family: "Noto Serif SC", serif;
  font-size: 1.05rem;
  margin: 0 0 0.45rem;
}

.pillar p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.95rem;
}

.pillar {
  padding-top: 1rem;
  border-top: 2px solid var(--green);
}

/* Services */
.services {
  background:
    linear-gradient(180deg, transparent, rgba(200, 235, 216, 0.28) 20%, rgba(200, 235, 216, 0.28) 80%, transparent);
}

.services-layout {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 2.5rem;
  align-items: start;
}

.services-visual {
  position: sticky;
  top: 5.5rem;
}

.services-visual img {
  width: 100%;
}

.service-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.service-item {
  display: grid;
  grid-template-columns: 3rem 1fr;
  gap: 1rem;
  padding: 1.35rem 0;
  border-bottom: 1px solid var(--line);
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

.service-item.is-visible {
  opacity: 1;
  transform: none;
}

.service-item:first-child {
  border-top: 1px solid var(--line);
}

.service-num {
  font-family: "Syne", sans-serif;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--green);
  line-height: 1.4;
}

.service-item h3 {
  margin: 0 0 0.4rem;
  font-size: 1.08rem;
  font-family: "Noto Serif SC", serif;
}

.service-item p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.95rem;
}

/* Advantages */
.advantage-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.advantage {
  padding: 1.5rem 0 0;
  border-top: 1px solid var(--line);
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

.advantage.is-visible {
  opacity: 1;
  transform: none;
}

.advantage-icon {
  width: 2.6rem;
  height: 2.6rem;
  margin-bottom: 1rem;
  color: var(--green-deep);
}

.advantage h3 {
  margin: 0 0 0.5rem;
  font-family: "Noto Serif SC", serif;
  font-size: 1.08rem;
}

.advantage p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.95rem;
}

/* Audience */
.audience {
  background: var(--white);
  border-block: 1px solid var(--line);
}

.audience-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem 1.5rem;
}

.audience-list li {
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--line);
  font-size: 1.02rem;
  color: var(--ink-soft);
}

.audience-list li strong {
  display: block;
  color: var(--ink);
  font-family: "Noto Serif SC", serif;
  font-weight: 700;
  margin-bottom: 0.2rem;
}

/* Vision / CTA */
.vision {
  position: relative;
  overflow: hidden;
}

.vision-panel {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 2.5rem;
  align-items: center;
  padding: 2.5rem 0;
}

.vision-copy p {
  color: var(--ink-soft);
  margin: 0 0 1.5rem;
  font-size: 1.05rem;
}

.vision-visual img {
  width: 100%;
  mix-blend-mode: multiply;
}

/* Footer */
.site-footer {
  background: var(--ink);
  color: rgba(255, 255, 255, 0.78);
  padding: 2.75rem 0 2rem;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1.25rem;
  align-items: end;
}

.footer-brand {
  font-family: "Noto Serif SC", serif;
  font-size: 1.2rem;
  color: var(--white);
  margin: 0 0 0.35rem;
}

.footer-meta {
  margin: 0;
  font-size: 0.9rem;
}

.footer-note {
  font-size: 0.85rem;
  opacity: 0.7;
}

/* Motion helpers */
.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

@keyframes riseIn {
  from {
    opacity: 0;
    transform: translateY(22px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@keyframes heroZoom {
  from {
    transform: scale(1.08);
  }
  to {
    transform: scale(1);
  }
}

/* Responsive */
@media (max-width: 960px) {
  .about-grid,
  .services-layout,
  .vision-panel {
    grid-template-columns: 1fr;
  }

  .services-visual {
    position: static;
    max-width: 28rem;
    margin-inline: auto;
  }

  .advantage-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .pillars,
  .audience-list {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 720px) {
  .nav-toggle {
    display: block;
  }

  .nav-links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    gap: 0;
    background: rgba(255, 255, 255, 0.98);
    border-bottom: 1px solid var(--line);
    padding: 0.5rem 1.25rem 1rem;
  }

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

  .nav-links a {
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--line);
  }

  .hero-content {
    padding: 7rem 0 3.25rem;
  }

  .about-highlights,
  .advantage-grid,
  .pillars,
  .audience-list {
    grid-template-columns: 1fr;
  }

  .section {
    padding: 4rem 0;
  }
}