:root {
  color-scheme: light;
  --ink: #18201f;
  --muted: #5d6865;
  --line: #dce3df;
  --paper: #f7f8f4;
  --white: #ffffff;
  --charcoal: #121817;
  --green: #2f725a;
  --green-dark: #1f5c47;
  --amber: #c8802e;
  --steel: #637174;
  --shadow: 0 20px 60px rgba(18, 24, 23, 0.12);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    "PingFang SC", "Microsoft YaHei", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
}

body,
button,
input,
textarea {
  letter-spacing: 0;
}

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

.site-header {
  position: fixed;
  z-index: 20;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  height: 72px;
  padding: 0 clamp(20px, 4vw, 56px);
  color: var(--white);
  transition:
    background 180ms ease,
    color 180ms ease,
    box-shadow 180ms ease;
}

.site-header[data-elevated="true"] {
  background: rgba(247, 248, 244, 0.92);
  color: var(--ink);
  box-shadow: 0 1px 0 rgba(18, 24, 23, 0.08);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
  font-weight: 750;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 44px;
  height: 32px;
  border: 1px solid currentColor;
  font-size: 13px;
}

.brand-text {
  white-space: nowrap;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: clamp(18px, 3vw, 34px);
  font-size: 14px;
}

.nav-links a,
.nav-cta {
  opacity: 0.88;
}

.nav-links a:hover,
.nav-cta:hover {
  opacity: 1;
}

.nav-cta {
  border: 1px solid currentColor;
  padding: 10px 16px;
  font-size: 14px;
}

.hero {
  position: relative;
  min-height: 92vh;
  display: grid;
  align-items: center;
  overflow: hidden;
  color: var(--white);
  padding: 116px clamp(22px, 7vw, 96px) 76px;
}

.hero-image,
.hero-shade {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.hero-image {
  object-fit: cover;
  object-position: center;
  transform: scale(1.015);
}

.hero-shade {
  background:
    linear-gradient(90deg, rgba(9, 13, 13, 0.92) 0%, rgba(9, 13, 13, 0.72) 42%, rgba(9, 13, 13, 0.18) 100%),
    linear-gradient(0deg, rgba(9, 13, 13, 0.45), rgba(9, 13, 13, 0.08));
}

.hero-content {
  position: relative;
  z-index: 1;
  width: min(760px, 100%);
  padding-top: 20px;
}

.hero-portraits {
  position: absolute;
  z-index: 2;
  right: clamp(22px, 6vw, 86px);
  bottom: clamp(30px, 7vw, 92px);
  display: grid;
  grid-template-columns: 160px 220px;
  gap: 14px;
  align-items: end;
  width: min(420px, 34vw);
}

.hero-portraits img {
  width: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  border: 1px solid rgba(255, 255, 255, 0.48);
  box-shadow: 0 20px 70px rgba(0, 0, 0, 0.34);
}

.hero-portraits img:first-child {
  aspect-ratio: 1;
}

.eyebrow,
.section-kicker {
  margin: 0 0 18px;
  color: var(--amber);
  font-size: 13px;
  font-weight: 780;
  text-transform: uppercase;
}

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

h1 {
  margin-bottom: 24px;
  font-size: clamp(42px, 7vw, 88px);
  line-height: 0.98;
  font-weight: 820;
  max-width: 820px;
}

.hero-copy {
  max-width: 690px;
  color: rgba(255, 255, 255, 0.86);
  font-size: clamp(17px, 2vw, 22px);
  line-height: 1.75;
}

.hero-actions,
.contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 13px 20px;
  border: 1px solid transparent;
  font: inherit;
  font-weight: 750;
  cursor: pointer;
}

.button.primary {
  background: var(--green);
  color: var(--white);
}

.button.primary:hover {
  background: var(--green-dark);
}

.button.secondary {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.45);
  color: currentColor;
}

.section {
  padding: clamp(70px, 10vw, 128px) clamp(22px, 7vw, 96px);
}

.profile,
.mission,
.audience {
  background: var(--white);
}

.profile {
  display: grid;
  grid-template-columns: minmax(280px, 0.78fr) minmax(0, 1fr);
  gap: clamp(30px, 6vw, 86px);
  align-items: center;
}

.profile-media {
  overflow: hidden;
  aspect-ratio: 4 / 3;
  background: #dce3df;
}

.profile-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.profile-copy h2 {
  margin-bottom: 24px;
  font-size: clamp(30px, 4vw, 56px);
  line-height: 1.1;
  font-weight: 810;
}

.profile-copy p {
  color: var(--muted);
  font-size: 17px;
  line-height: 1.85;
}

.mission-layout,
.section-heading,
.audience {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 0.7fr);
  gap: clamp(32px, 6vw, 88px);
  align-items: start;
}

.mission h2,
.section-heading h2,
.audience h2,
.contact h2 {
  margin-bottom: 0;
  font-size: clamp(30px, 4vw, 58px);
  line-height: 1.08;
  font-weight: 810;
}

.mission-copy,
.section-heading p,
.audience-list,
.contact p {
  color: var(--muted);
  font-size: 17px;
  line-height: 1.85;
}

.roadmap {
  background: #eef2ed;
}

.section-heading {
  margin-bottom: 46px;
}

.timeline {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.timeline-item {
  min-height: 278px;
  padding: 28px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.44);
}

.day-range,
.card-index {
  display: inline-block;
  margin-bottom: 34px;
  color: var(--green);
  font-size: 13px;
  font-weight: 820;
}

.timeline-item h3,
.content-card h3 {
  margin-bottom: 14px;
  font-size: 23px;
}

.timeline-item p,
.content-card p {
  color: var(--muted);
  line-height: 1.78;
}

.content-band {
  background: var(--charcoal);
  color: var(--white);
}

.content-band .section-heading p,
.content-card p {
  color: rgba(255, 255, 255, 0.68);
}

.content-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  background: rgba(255, 255, 255, 0.16);
}

.content-card {
  min-height: 300px;
  padding: 28px;
  background: var(--charcoal);
}

.content-card .card-index {
  color: var(--amber);
}

.audience-list {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.audience-list li {
  position: relative;
  padding: 18px 0 18px 30px;
  border-bottom: 1px solid var(--line);
}

.audience-list li::before {
  content: "";
  position: absolute;
  top: 30px;
  left: 0;
  width: 10px;
  height: 10px;
  background: var(--amber);
}

.contact {
  background:
    linear-gradient(135deg, rgba(47, 114, 90, 0.12), rgba(200, 128, 46, 0.13)),
    var(--paper);
}

.contact-panel {
  max-width: 920px;
  margin: 0 auto;
  text-align: center;
}

.contact-panel .contact-actions {
  justify-content: center;
}

.social-grid {
  display: grid;
  grid-template-columns: minmax(260px, 0.86fr) repeat(2, minmax(260px, 1fr));
  gap: 20px;
  margin-top: 34px;
  text-align: left;
  align-items: stretch;
}

.social-card {
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-height: 100%;
  padding: 24px;
  background: rgba(255, 255, 255, 0.86);
  border: 1px solid rgba(18, 24, 23, 0.09);
  box-shadow: var(--shadow);
}

.social-label {
  display: inline-flex;
  margin-bottom: 10px;
  color: var(--green);
  font-size: 13px;
  font-weight: 820;
}

.social-card h3 {
  margin: 0;
  color: var(--ink);
  font-size: 22px;
  line-height: 1.28;
}

.wechat-id {
  display: grid;
  gap: 8px;
  padding: 22px 0;
  border-top: 1px solid rgba(18, 24, 23, 0.1);
  border-bottom: 1px solid rgba(18, 24, 23, 0.1);
}

.wechat-id span {
  color: var(--muted);
  font-size: 14px;
}

.wechat-id strong {
  color: var(--ink);
  font-size: clamp(34px, 4vw, 50px);
  line-height: 1.1;
}

.qr-card {
  justify-content: space-between;
}

.qr-heading {
  min-height: 74px;
}

.qr-frame {
  display: grid;
  place-items: center;
  padding: 14px;
  background: var(--white);
  border: 1px solid rgba(18, 24, 23, 0.08);
}

.qr-frame img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  object-position: center;
  display: block;
}

.social-card p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.65;
  min-height: 48px;
}

.wechat-card {
  justify-content: space-between;
  background: var(--charcoal);
  color: var(--white);
}

.wechat-card h3,
.wechat-card .wechat-id strong {
  color: var(--white);
}

.wechat-card .wechat-id {
  border-color: rgba(255, 255, 255, 0.18);
}

.wechat-card .wechat-id span {
  color: rgba(255, 255, 255, 0.62);
}

.contact .button.secondary {
  border-color: var(--line);
  color: var(--ink);
  background: rgba(255, 255, 255, 0.52);
}

.copy-status {
  min-height: 28px;
  margin: 18px 0 0;
  color: var(--green);
  font-size: 14px;
}

.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 28px clamp(22px, 7vw, 96px);
  background: var(--charcoal);
  color: rgba(255, 255, 255, 0.72);
  font-size: 14px;
}

@media (max-width: 980px) {
  .nav-links {
    display: none;
  }

  .timeline,
  .content-grid,
  .social-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .wechat-card {
    grid-column: 1 / -1;
  }

  .mission-layout,
  .section-heading,
  .audience,
  .profile {
    grid-template-columns: 1fr;
  }

  .hero-portraits {
    right: 22px;
    bottom: 28px;
    grid-template-columns: 110px 138px;
    width: 270px;
    opacity: 0.86;
  }
}

@media (max-width: 640px) {
  .site-header {
    height: 64px;
    padding-inline: 16px;
  }

  .brand-text {
    max-width: 142px;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .nav-cta {
    padding: 9px 12px;
  }

  .hero {
    min-height: 94vh;
    padding: 94px 18px 54px;
  }

  .hero-shade {
    background:
      linear-gradient(90deg, rgba(9, 13, 13, 0.94), rgba(9, 13, 13, 0.76)),
      linear-gradient(0deg, rgba(9, 13, 13, 0.4), rgba(9, 13, 13, 0.18));
  }

  .hero-portraits {
    display: none;
  }

  h1 {
    font-size: 44px;
  }

  .hero-copy,
  .mission-copy,
  .section-heading p,
  .audience-list,
  .contact p {
    font-size: 16px;
  }

  .section {
    padding: 64px 18px;
  }

  .timeline,
  .content-grid,
  .social-grid {
    grid-template-columns: 1fr;
  }

  .wechat-card {
    grid-column: auto;
  }

  .wechat-card .button {
    width: 100%;
  }

  .timeline-item,
  .content-card {
    min-height: 230px;
    padding: 24px;
  }

  .button {
    width: 100%;
  }

  .site-footer {
    flex-direction: column;
    align-items: flex-start;
    padding: 24px 18px;
  }
}