:root {
  --soil: #2a1f14;
  --leaf: #1f4d3a;
  --leaf-deep: #0f2a1f;
  --dawn: #e8c97a;
  --mist: #eef3ee;
  --cream: #f7f4ee;
  --ink: #1a1c18;
  --muted: #5c655e;
  --line: rgba(31, 77, 58, 0.14);
  --serif: "Songti SC", "STSong", "Noto Serif SC", "SimSun", serif;
  --sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--sans);
  color: var(--ink);
  background: var(--cream);
  line-height: 1.7;
  text-rendering: optimizeLegibility;
}

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

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

.wrap {
  width: min(1120px, calc(100% - 2.5rem));
  margin-inline: auto;
}

#page-top {
  position: absolute;
  top: 0;
  left: 0;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  transition: background 0.35s ease, backdrop-filter 0.35s ease, box-shadow 0.35s ease;
}

.site-header.is-scrolled {
  background: rgba(247, 244, 238, 0.9);
  backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 var(--line);
}

.logo {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 1.2rem;
  letter-spacing: 0.08em;
}

.nav {
  display: flex;
  gap: 1.25rem;
  font-size: 0.92rem;
}

.nav a {
  opacity: 0.78;
  transition: opacity 0.2s ease;
}

.nav a:hover {
  opacity: 1;
}

.nav-toggle {
  display: none;
  width: 2.5rem;
  height: 2.5rem;
  border: 0;
  background: transparent;
  padding: 0;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 1.35rem;
  height: 2px;
  margin: 0.35rem auto;
  background: var(--ink);
}

.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;
  display: grid;
  align-items: end;
  color: #f6f8f4;
  overflow: hidden;
}

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

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scale(1.06);
  animation: heroDrift 18s ease-in-out infinite alternate;
}

.hero-veil {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(15, 42, 31, 0.25) 0%, rgba(15, 42, 31, 0.55) 48%, rgba(15, 42, 31, 0.88) 100%),
    linear-gradient(90deg, rgba(15, 42, 31, 0.45), transparent 55%);
}

.hero-content {
  position: relative;
  z-index: 1;
  width: min(880px, calc(100% - 2.5rem));
  margin: 0 auto 12vh;
  padding-top: 6rem;
}

.brand-mark {
  margin: 0 0 0.85rem;
  font-family: var(--serif);
  font-size: clamp(2rem, 5vw, 3.4rem);
  font-weight: 700;
  letter-spacing: 0.18em;
  line-height: 1.15;
}

.hero h1 {
  margin: 0;
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(1.45rem, 3.4vw, 2.35rem);
  line-height: 1.35;
  max-width: 16em;
}

.hero-lead {
  margin: 1.15rem 0 0;
  max-width: 34em;
  color: rgba(246, 248, 244, 0.86);
  font-size: 1.02rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin-top: 1.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.85rem;
  padding: 0.7rem 1.25rem;
  border: 1px solid transparent;
  font: inherit;
  font-size: 0.95rem;
  cursor: pointer;
  transition: transform 0.2s ease, background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--dawn);
  color: var(--leaf-deep);
  font-weight: 700;
}

.btn-ghost {
  border-color: rgba(246, 248, 244, 0.45);
  color: #f6f8f4;
}

.btn-ghost:hover {
  background: rgba(246, 248, 244, 0.1);
}

.section {
  padding: clamp(4.5rem, 9vw, 7rem) 0;
}

.section-head {
  max-width: 40rem;
  margin-bottom: 2.75rem;
}

.section-head.light {
  color: #f2f6f2;
}

.eyebrow {
  margin: 0 0 0.65rem;
  color: var(--leaf);
  font-size: 0.82rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}

.section-head.light .eyebrow {
  color: var(--dawn);
}

.section-head h2,
.visit-copy h2,
.contact-inner h2 {
  margin: 0;
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(1.55rem, 3vw, 2.2rem);
  line-height: 1.35;
}

.section-desc,
.visit-copy p,
.contact-lead {
  margin: 1rem 0 0;
  color: var(--muted);
  font-size: 1.02rem;
}

.section-head.light .section-desc {
  color: rgba(242, 246, 242, 0.78);
}

.about {
  background:
    radial-gradient(circle at 10% 20%, rgba(232, 201, 122, 0.18), transparent 40%),
    var(--cream);
}

.about-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem 1.75rem;
  border-top: 1px solid var(--line);
  padding-top: 2rem;
}

.about-grid h3 {
  margin: 0 0 0.7rem;
  font-family: var(--serif);
  font-size: 1.2rem;
}

.about-grid p {
  margin: 0;
  color: var(--muted);
}

.org {
  background: #eef2ef;
}

.org-subhead {
  margin: 2.5rem 0 1.1rem;
  font-family: var(--serif);
  font-size: 1.25rem;
  color: var(--leaf-deep);
}

.org-chart {
  display: grid;
  justify-items: center;
  gap: 0.65rem;
  padding: 1.5rem 0 0.5rem;
}

.org-node {
  width: min(100%, 280px);
  padding: 0.95rem 1rem;
  background: #fff;
  border-top: 3px solid var(--leaf);
  text-align: center;
  font-family: var(--serif);
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--leaf-deep);
}

.org-node span {
  display: block;
  margin-top: 0.4rem;
  font-family: var(--sans);
  font-size: 0.82rem;
  font-weight: 400;
  color: var(--muted);
  line-height: 1.45;
}

.org-node-top {
  width: min(100%, 420px);
  border-top-color: var(--dawn);
  background: var(--leaf-deep);
  color: #f4f7f4;
}

.org-node-top span {
  color: rgba(244, 247, 244, 0.75);
}

.org-node-core {
  width: min(100%, 520px);
  border-top-color: #6b8f71;
}

.org-branch {
  width: 1px;
  height: 18px;
  background: rgba(31, 77, 58, 0.35);
}

.org-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  width: 100%;
}

.org-row .org-node {
  width: 100%;
}

.entity-grid,
.people-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}

.entity-grid article,
.person-card {
  padding: 1.15rem 1.2rem 1.25rem;
  background: #fff;
  border: 1px solid var(--line);
}

.entity-grid h4,
.person-card h4 {
  margin: 0 0 0.65rem;
  font-family: var(--serif);
  font-size: 1.12rem;
  color: var(--leaf-deep);
}

.entity-grid ul {
  margin: 0;
  padding-left: 1.1rem;
  color: var(--muted);
}

.entity-grid li + li {
  margin-top: 0.4rem;
}

.person-role {
  margin: 0 0 0.35rem;
  color: var(--leaf);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
}

.person-card p:last-child {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.7;
}

.layer-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.layer-list li {
  display: grid;
  grid-template-columns: 8.5rem 1fr;
  gap: 1rem;
  padding: 1rem 0;
  border-top: 1px solid var(--line);
  align-items: baseline;
}

.layer-list li:last-child {
  border-bottom: 1px solid var(--line);
}

.layer-list strong {
  font-family: var(--serif);
  color: var(--leaf-deep);
}

.layer-list span {
  color: var(--muted);
}

.org-footnote {
  margin: 2rem 0 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.story {
  background: #f3efe6;
}

.story-feature {
  margin-bottom: 2rem;
}

.story-feature img {
  width: 100%;
  max-height: 420px;
  object-fit: cover;
  object-position: center 20%;
}

.story-feature p {
  margin: 0.55rem 0 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.story-narrative {
  margin: 2rem 0 2.5rem;
  max-width: 46rem;
}

.story-narrative h3 {
  margin: 1.6rem 0 0.65rem;
  font-family: var(--serif);
  font-size: 1.2rem;
  color: var(--leaf-deep);
}

.story-narrative h3:first-child {
  margin-top: 0;
}

.story-narrative p {
  margin: 0;
  color: var(--muted);
  font-size: 1.02rem;
  line-height: 1.85;
}

.story-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.75rem 2rem;
}

.story-grid h3,
.smart-points h3,
.data-extra h3 {
  margin: 0 0 0.65rem;
  font-family: var(--serif);
  font-size: 1.15rem;
  color: var(--leaf-deep);
}

.story-grid p {
  margin: 0;
  color: var(--muted);
}

.scale {
  background: #e7eee8;
}

.data-extra {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin-top: 2.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--line);
}

.data-extra ul {
  margin: 0;
  padding-left: 1.1rem;
  color: var(--muted);
}

.data-extra li + li {
  margin-top: 0.55rem;
}

.smart {
  background: var(--cream);
}

.smart-points {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
  border-top: 1px solid var(--line);
  padding-top: 2rem;
}

.smart-points p {
  margin: 0;
  color: var(--muted);
}

.media {
  background: #eef3ee;
}

.media-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.85rem;
}

.media-list a {
  display: block;
  padding: 1rem 0;
  border-top: 1px solid var(--line);
  color: var(--leaf-deep);
  line-height: 1.55;
  transition: color 0.2s ease;
}

.media-list li:last-child a {
  border-bottom: 1px solid var(--line);
}

.media-list a:hover {
  color: #0b1f17;
  text-decoration: underline;
}

.photo-credit {
  margin: 0.55rem 0 0;
  color: var(--muted);
  font-size: 0.82rem;
}

.scenes {
  background: #f7f4ee;
}

.scene-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.1rem;
}

.scene-card {
  display: block;
  overflow: hidden;
  background: #fff;
  border: 1px solid var(--line);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.scene-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 28px rgba(15, 42, 31, 0.1);
}

.scene-card img {
  width: 100%;
  height: 210px;
  object-fit: cover;
}

.scene-meta {
  padding: 0.95rem 1rem 1.1rem;
}

.scene-tag {
  display: inline-block;
  margin-bottom: 0.4rem;
  color: var(--leaf);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
}

.scene-meta h3 {
  margin: 0;
  font-family: var(--serif);
  font-size: 1.05rem;
  line-height: 1.4;
}

.scene-meta p {
  margin: 0.45rem 0 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.press-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

.press-card {
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 1rem;
  padding: 0.85rem;
  background: #fff;
  border: 1px solid var(--line);
}

.press-thumb img {
  width: 100%;
  height: 118px;
  object-fit: cover;
}

.press-outlet {
  margin: 0;
  color: var(--leaf);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
}

.press-body h3 {
  margin: 0.35rem 0 0.45rem;
  font-family: var(--serif);
  font-size: 1.02rem;
  line-height: 1.4;
}

.press-body h3 a:hover {
  text-decoration: underline;
}

.press-body p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.press-link {
  display: inline-block;
  margin-top: 0.65rem;
  color: var(--leaf-deep);
  font-weight: 700;
  font-size: 0.9rem;
}

.press-link:hover {
  text-decoration: underline;
}

.videos {
  background: var(--leaf-deep);
  color: #f2f6f2;
}

.videos .section-desc,
.videos .video-note p,
.videos .video-body p {
  color: rgba(242, 246, 242, 0.78);
}

.videos .eyebrow {
  color: var(--dawn);
}

.videos .section-head h2 {
  color: #f2f6f2;
}

.video-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

.video-card {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  overflow: hidden;
}

.video-cover {
  position: relative;
  display: grid;
  place-items: center;
  min-height: 160px;
  text-decoration: none;
}

.video-cover.tone-a {
  background: linear-gradient(135deg, #1f4d3a, #0f2a1f);
}
.video-cover.tone-b {
  background: linear-gradient(135deg, #355a45, #1a3328);
}
.video-cover.tone-c {
  background: linear-gradient(135deg, #4a6b3a, #243820);
}
.video-cover.tone-d {
  background: linear-gradient(135deg, #6b5a2e, #2a2412);
}

.play-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.6rem;
  padding: 0 1.1rem;
  border: 1px solid rgba(232, 201, 122, 0.65);
  color: var(--dawn);
  font-weight: 700;
  letter-spacing: 0.06em;
  background: rgba(0, 0, 0, 0.25);
}

.video-body {
  padding: 1rem 1.1rem 1.2rem;
}

.video-body .press-outlet {
  color: var(--dawn);
}

.video-body h3 {
  margin: 0.35rem 0 0.5rem;
  font-family: var(--serif);
  font-size: 1.05rem;
  line-height: 1.4;
  color: #f6f8f4;
}

.video-body .press-link {
  color: var(--dawn);
}

.video-note {
  margin-top: 1.75rem;
  padding-top: 1.25rem;
  border-top: 1px solid rgba(255, 255, 255, 0.14);
  font-size: 0.92rem;
}

.fact-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.fact-list li {
  padding-right: 0.5rem;
  border-top: 2px solid var(--leaf);
  padding-top: 1rem;
}

.fact-num {
  display: block;
  font-family: var(--serif);
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 700;
  color: var(--leaf-deep);
  line-height: 1.1;
}

.fact-label {
  display: block;
  margin-top: 0.55rem;
  font-weight: 700;
}

.fact-note {
  display: block;
  margin-top: 0.35rem;
  color: var(--muted);
  font-size: 0.88rem;
}

.quote-block {
  margin-top: 3rem;
  padding: 1.75rem 0 0;
  border-top: 1px solid var(--line);
}

.quote-block blockquote {
  margin: 0;
  max-width: 46rem;
  font-family: var(--serif);
  font-size: clamp(1.15rem, 2.2vw, 1.45rem);
  line-height: 1.7;
  color: var(--leaf-deep);
}

.trace {
  position: relative;
  background: var(--leaf-deep);
  color: #f2f6f2;
  overflow: hidden;
}

.trace-bg {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(135deg, rgba(232, 201, 122, 0.12), transparent 45%),
    repeating-linear-gradient(
      -12deg,
      transparent,
      transparent 18px,
      rgba(255, 255, 255, 0.02) 18px,
      rgba(255, 255, 255, 0.02) 19px
    );
  pointer-events: none;
}

.trace .wrap {
  position: relative;
}

.trace-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.step-i {
  display: block;
  color: var(--dawn);
  font-family: var(--serif);
  font-size: 0.95rem;
  letter-spacing: 0.12em;
  margin-bottom: 0.7rem;
}

.step h3 {
  margin: 0 0 0.55rem;
  font-family: var(--serif);
  font-size: 1.15rem;
}

.step p {
  margin: 0;
  color: rgba(242, 246, 242, 0.75);
  font-size: 0.95rem;
}

.trace-aside {
  margin: 2.5rem 0 0;
  max-width: 46rem;
  color: rgba(242, 246, 242, 0.7);
  font-size: 0.95rem;
}

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

.chain-flow li {
  display: grid;
  grid-template-columns: 8rem 1fr;
  gap: 1.25rem;
  align-items: baseline;
  padding: 1.25rem 0;
  border-top: 1px solid var(--line);
}

.chain-flow li:last-child {
  border-bottom: 1px solid var(--line);
}

.chain-flow strong {
  font-family: var(--serif);
  font-size: 1.15rem;
  color: var(--leaf-deep);
}

.chain-flow span {
  color: var(--muted);
}

.channel-note {
  margin-top: 2rem;
  color: var(--muted);
  max-width: 48rem;
}

.visit {
  background:
    linear-gradient(180deg, #f3efe6, #e8efe9);
}

.visit-layout {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 2.5rem;
  align-items: center;
}

.visit-panel {
  overflow: hidden;
  min-height: 320px;
}

.visit-panel img {
  width: 100%;
  height: 100%;
  min-height: 360px;
  object-fit: cover;
  filter: saturate(1.05) contrast(1.02);
}

.contact {
  background: var(--leaf);
  color: #f4f7f4;
}

.contact .eyebrow {
  color: var(--dawn);
}

.contact-lead {
  color: rgba(244, 247, 244, 0.78);
}

.contact-meta {
  list-style: none;
  margin: 1.75rem 0 2rem;
  padding: 0;
  display: grid;
  gap: 0.65rem;
}

.contact-meta li span {
  display: inline-block;
  min-width: 4.5rem;
  color: var(--dawn);
  letter-spacing: 0.08em;
  font-size: 0.85rem;
}

.contact .btn-primary {
  background: var(--dawn);
  color: var(--leaf-deep);
}

.site-footer {
  background: var(--leaf-deep);
  color: rgba(244, 247, 244, 0.72);
  padding: 1.5rem 0 2rem;
  font-size: 0.88rem;
}

.footer-inner {
  display: grid;
  gap: 0.35rem;
}

.footer-inner p {
  margin: 0;
}

.fineprint {
  opacity: 0.7;
  font-size: 0.8rem;
}

.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

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

@keyframes heroDrift {
  from {
    transform: scale(1.06) translate3d(0, 0, 0);
  }
  to {
    transform: scale(1.12) translate3d(-1.5%, -1%, 0);
  }
}

@media (max-width: 900px) {
  .about-grid,
  .fact-list,
  .trace-steps,
  .visit-layout,
  .story-grid,
  .data-extra,
  .smart-points,
  .scene-grid,
  .press-cards,
  .video-grid,
  .org-row,
  .entity-grid,
  .people-grid {
    grid-template-columns: 1fr 1fr;
  }

  .chain-flow li {
    grid-template-columns: 1fr;
    gap: 0.35rem;
  }
}

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

  .nav {
    position: absolute;
    top: 100%;
    right: 1rem;
    left: 1rem;
    display: none;
    flex-direction: column;
    gap: 0.85rem;
    padding: 1rem 1.1rem;
    background: rgba(247, 244, 238, 0.96);
    border: 1px solid var(--line);
  }

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

  .about-grid,
  .fact-list,
  .trace-steps,
  .visit-layout,
  .story-grid,
  .data-extra,
  .smart-points,
  .scene-grid,
  .press-cards,
  .video-grid,
  .org-row,
  .entity-grid,
  .people-grid {
    grid-template-columns: 1fr;
  }

  .layer-list li {
    grid-template-columns: 1fr;
    gap: 0.35rem;
  }

  .press-card {
    grid-template-columns: 1fr;
  }

  .scene-card img,
  .press-thumb img {
    height: 200px;
  }

  .hero-content {
    margin-bottom: 8vh;
  }

  .brand-mark {
    letter-spacing: 0.12em;
  }
}

.back-top {
  position: fixed;
  right: 1.25rem;
  bottom: 1.35rem;
  z-index: 50;
  width: 2.75rem;
  height: 2.75rem;
  display: grid;
  place-items: center;
  margin: 0;
  padding: 0;
  border: 1px solid rgba(31, 77, 58, 0.22);
  border-radius: 999px;
  background: rgba(247, 244, 238, 0.94);
  color: var(--leaf-deep);
  font-size: 1.15rem;
  line-height: 1;
  cursor: pointer;
  box-shadow: 0 8px 22px rgba(15, 42, 31, 0.14);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s ease, background 0.2s ease;
}

.back-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-top:hover {
  background: #fff;
  color: var(--leaf);
}

.back-top:focus-visible {
  outline: 2px solid var(--leaf);
  outline-offset: 3px;
}

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

  .hero-media img,
  .reveal,
  .back-top {
    animation: none;
    transition: none;
    opacity: 1;
    transform: none;
  }

  .back-top:not(.is-visible) {
    opacity: 0;
  }
}