:root {
  --bg: #f6f5ef;
  --ink: #123e28;
  --green: #309e4b;
  --pale: #e7ecdf;
  --cream: #fffef9;
  --line: #d5ddce;
  --ink-soft: rgba(18, 62, 40, 0.72);
  --font:
    'Microsoft YaHei', 'PingFang SC', 'Hiragino Sans GB', system-ui, -apple-system, 'Segoe UI',
    Arial, sans-serif;
  --wrap: 1200px;
  --pad: 20px;
  --header-h: 68px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}
html {
  -webkit-text-size-adjust: 100%;
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
img {
  max-width: 100%;
  height: auto;
  display: block;
}
p {
  margin: 0 0 1em;
}
h1,
h2,
h3 {
  margin: 0;
  font-weight: 700;
  letter-spacing: 0.01em;
  line-height: 1.2;
}
ul,
ol {
  margin: 0;
  padding: 0;
  list-style: none;
}
a {
  color: inherit;
  text-decoration: none;
}

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 var(--pad);
}

.skip-link {
  position: absolute;
  left: 12px;
  top: -60px;
  z-index: 200;
  background: var(--ink);
  color: var(--cream);
  padding: 10px 16px;
  border-radius: 8px;
  transition: top 0.2s ease;
}
.skip-link:focus {
  top: 12px;
}

:focus-visible {
  outline: 3px solid var(--green);
  outline-offset: 3px;
  border-radius: 4px;
}

/* header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  display: flex;
  align-items: center;
  gap: 16px;
  min-height: var(--header-h);
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
}
.brand-mark {
  width: 46px;
  height: auto;
  flex: 0 0 auto;
}
.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}
.brand-cn {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.06em;
}
.brand-en {
  font-size: 10px;
  letter-spacing: 0.28em;
  color: var(--ink-soft);
  font-family: var(--font);
}

.site-nav {
  margin-left: auto;
}
.nav-list {
  display: flex;
  align-items: center;
  gap: 26px;
}
.nav-list a {
  font-size: 15px;
  padding: 10px 2px;
  display: inline-block;
}
.nav-list a:hover {
  color: var(--green);
}
.nav-cta a {
  font-weight: 400;
}

.nav-toggle {
  display: none;
  margin-left: auto;
  width: 46px;
  height: 46px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--cream);
  cursor: pointer;
  align-items: center;
  justify-content: center;
}
.nav-toggle-bars {
  position: relative;
  width: 20px;
  height: 2px;
  background: var(--ink);
  display: block;
}
.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: '';
  position: absolute;
  left: 0;
  width: 20px;
  height: 2px;
  background: var(--ink);
}
.nav-toggle-bars::before {
  top: -6px;
}
.nav-toggle-bars::after {
  top: 6px;
}

/* buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 12px 26px;
  border-radius: 16px;
  border: 1px solid transparent;
  font-size: 16px;
  font-family: var(--font);
  line-height: 1.2;
  cursor: pointer;
  transition:
    background-color 0.2s ease,
    border-color 0.2s ease,
    color 0.2s ease;
}
.btn-sm {
  min-height: 44px;
  padding: 10px 20px;
  font-size: 15px;
  border-radius: 14px;
}
.btn-solid {
  background: var(--ink);
  color: #fff;
}
.btn-solid:hover {
  background: #245535;
}
.btn-text {
  background: transparent;
  color: var(--ink);
  border-color: transparent;
  border-bottom: 1px solid var(--ink);
  border-radius: 0;
  padding: 12px 2px;
}
.btn-text:hover {
  color: var(--green);
  border-bottom-color: var(--green);
}

/* hero */
.hero {
  padding: clamp(36px, 6vw, 72px) 0 clamp(40px, 6vw, 72px);
  border-bottom: 1px solid var(--line);
}
.hero-inner {
  display: flex;
  gap: clamp(28px, 5vw, 64px);
  align-items: stretch;
}
.hero-copy {
  flex: 0 1 55%;
  min-width: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.hero-title {
  font-size: clamp(42px, 6.4vw, 76px);
  color: var(--ink);
  max-width: 11em;
  margin-bottom: 0.5em;
}
.hero-lead {
  font-size: clamp(16px, 1.5vw, 18px);
  color: var(--ink-soft);
  max-width: 30em;
  margin-bottom: 1.6em;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 22px;
}
.hero-divider {
  height: 1px;
  background: var(--line);
  margin: 2.2em 0 1.1em;
  max-width: 420px;
}
.hero-tags {
  font-size: 14px;
  letter-spacing: 0.14em;
  color: var(--ink-soft);
  margin: 0;
}

.hero-art {
  flex: 1 1 45%;
  min-width: 0;
  display: flex;
  flex-direction: column;
}
.hero-art-inner {
  flex: 1;
  background: var(--pale);
  border-radius: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: clamp(34px, 5vw, 64px) clamp(24px, 4vw, 52px);
  min-height: 340px;
}
.hero-art-logo {
  width: 75%;
  max-width: 340px;
}
.hero-art-caption {
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
  margin: 16px 0 0;
  text-align: right;
}

@keyframes gentleFloat {
  0% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-8px);
  }
  100% {
    transform: translateY(0);
  }
}
.js-float {
  animation: gentleFloat 9s ease-in-out 1;
}

/* sections */
.section {
  padding: clamp(56px, 8vw, 104px) 0;
}
section[id] {
  scroll-margin-top: calc(var(--header-h) + 16px);
}

.display-title {
  font-size: clamp(30px, 4.4vw, 54px);
  color: var(--ink);
}
.hairline {
  height: 1px;
  background: var(--line);
}

/* about */
.about-grid {
  display: flex;
  gap: clamp(28px, 6vw, 90px);
  align-items: flex-start;
  margin-bottom: clamp(48px, 7vw, 92px);
}
.about-head {
  flex: 0 1 42%;
}
.about-body {
  flex: 1 1 58%;
  max-width: 44em;
  padding-top: 0.4em;
}
.about-body p {
  font-size: 17px;
  color: var(--ink-soft);
  margin-bottom: 1.3em;
}
.about-body p:last-child {
  margin-bottom: 0;
}

/* services */
.section-head {
  max-width: 44em;
  margin-bottom: clamp(32px, 5vw, 56px);
}
.section-head .display-title {
  margin-bottom: 0.35em;
}
.section-sub {
  font-size: 17px;
  color: var(--ink-soft);
  margin: 0;
}

.services-layout {
  display: flex;
  gap: clamp(24px, 4vw, 56px);
  align-items: flex-start;
}
.services-tabs {
  flex: 0 0 240px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.tab {
  position: relative;
  display: block;
  width: 100%;
  text-align: left;
  min-height: 52px;
  padding: 14px 14px 14px 18px;
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--line);
  font-family: var(--font);
  font-size: 17px;
  color: var(--ink-soft);
  cursor: pointer;
  border-radius: 8px;
  transition:
    color 0.2s ease,
    background-color 0.2s ease;
}
.tab::after {
  content: '';
  position: absolute;
  left: 18px;
  bottom: -1px;
  width: 26px;
  height: 2px;
  background: transparent;
  transition: background-color 0.2s ease;
}
.tab:hover {
  color: var(--ink);
}
.tab.is-active {
  color: var(--ink);
  font-weight: 700;
  background: var(--cream);
}
.tab.is-active::after {
  background: var(--green);
}

.services-panels {
  flex: 1 1 auto;
  min-width: 0;
}
.panel {
  position: relative;
  background: var(--ink);
  color: #eef3ea;
  border-radius: 20px;
  padding: clamp(28px, 4vw, 52px);
  overflow: hidden;
  min-height: 420px;
}
.panel-ghost {
  position: absolute;
  right: clamp(18px, 3vw, 40px);
  top: clamp(18px, 3vw, 40px);
  width: 120px;
  height: 68px;
  opacity: 0.16;
  background: currentColor;
  -webkit-mask: url(assets/brand-mark.png) center/contain no-repeat;
  mask: url(assets/brand-mark.png) center/contain no-repeat;
  background-color: #fff;
  pointer-events: none;
}
.panel-title {
  font-size: clamp(22px, 2.6vw, 32px);
  color: #fff;
  margin-bottom: 1.1em;
  max-width: 16em;
}
.panel-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: clamp(28px, 4vw, 44px);
}
.panel-list li {
  position: relative;
  padding-left: 20px;
  font-size: 17px;
  line-height: 1.6;
}
.panel-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--green);
}

.mini-app {
  border-top: 1px solid rgba(255, 255, 255, 0.18);
  padding-top: clamp(20px, 3vw, 32px);
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.mini-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 18px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}
.mini-row:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}
.mini-key {
  font-size: clamp(18px, 2.1vw, 26px);
  font-weight: 700;
  color: #fff;
}
.mini-val {
  font-size: clamp(13px, 1.4vw, 15px);
  letter-spacing: 0.1em;
  color: rgba(238, 243, 234, 0.7);
}

/* join */
.join-grid {
  display: flex;
  gap: clamp(28px, 5vw, 80px);
  align-items: flex-start;
}
.join-head {
  flex: 0 1 40%;
}
.join-head .display-title {
  margin-bottom: 0.4em;
}
.join-lead {
  font-size: 17px;
  color: var(--ink-soft);
  max-width: 30em;
}
.join-steps {
  flex: 1 1 60%;
  display: flex;
  flex-direction: column;
  gap: clamp(20px, 3vw, 30px);
  list-style: none;
  counter-reset: step;
}
.step {
  display: flex;
  gap: 18px;
  align-items: flex-start;
  padding-bottom: clamp(20px, 3vw, 28px);
  border-bottom: 1px solid var(--line);
}
.step:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}
.step-num {
  flex: 0 0 auto;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  color: var(--ink);
  font-weight: 700;
  font-size: 16px;
}
.step-title {
  font-size: 19px;
  margin-bottom: 0.35em;
}
.step-body p {
  font-size: 16px;
  color: var(--ink-soft);
  margin: 0;
}
.join-note {
  margin: clamp(28px, 4vw, 44px) 0 0;
  font-size: 14px;
  color: var(--ink-soft);
  letter-spacing: 0.02em;
}

/* faq */
.faq {
  margin-top: clamp(48px, 7vw, 88px);
  border-top: 1px solid var(--line);
  padding-top: clamp(28px, 4vw, 48px);
}
.faq-heading {
  font-size: clamp(20px, 2.4vw, 26px);
  margin-bottom: 1.2em;
}
.faq-item {
  border-bottom: 1px solid var(--line);
}
.faq-item summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 56px;
  padding: 14px 4px 14px 0;
  font-size: 17px;
  font-weight: 700;
}
.faq-item summary::-webkit-details-marker {
  display: none;
}
.faq-item summary::after {
  content: '';
  flex: 0 0 auto;
  width: 10px;
  height: 10px;
  border-right: 2px solid var(--ink);
  border-bottom: 2px solid var(--ink);
  transform: rotate(45deg);
  transition: transform 0.2s ease;
  margin-right: 6px;
}
.faq-item[open] summary::after {
  transform: rotate(-135deg);
}
.faq-body {
  padding: 0 0 20px;
}
.faq-body p {
  margin: 0;
  color: var(--ink-soft);
  max-width: 52em;
  padding-right: 26px;
}

/* closing */
.section-closing {
  border-top: 1px solid var(--line);
}
.closing-inner {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: clamp(24px, 4vw, 40px);
}
.closing-title {
  font-size: clamp(32px, 6vw, 68px);
  color: var(--ink);
}
.closing-logo {
  width: clamp(84px, 12vw, 120px);
}

/* footer */
.site-footer {
  border-top: 1px solid var(--line);
  background: var(--cream);
}
.footer-inner {
  padding: clamp(36px, 5vw, 56px) var(--pad);
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.footer-brand {
  font-weight: 700;
  letter-spacing: 0.08em;
  margin: 0;
}
.footer-line {
  margin: 0;
  color: var(--ink-soft);
  font-size: 15px;
}
.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin: 8px 0;
}
.footer-links a {
  font-size: 15px;
  padding: 8px 0;
  display: inline-block;
}
.footer-links a:hover {
  color: var(--green);
}
.footer-copy {
  margin: 0;
  font-size: 13px;
  color: var(--ink-soft);
  letter-spacing: 0.04em;
}

/* responsive */
@media (max-width: 960px) {
  .hero-inner {
    flex-direction: column;
  }
  .hero-copy,
  .hero-art {
    flex: 1 1 auto;
  }
  .hero-title {
    font-size: clamp(42px, 9vw, 52px);
    max-width: none;
  }
  .hero-art-inner {
    min-height: 280px;
  }
  .hero-art-caption {
    text-align: left;
  }
  .about-grid,
  .join-grid {
    flex-direction: column;
  }
  .about-head,
  .about-body,
  .join-head,
  .join-steps {
    flex: 1 1 auto;
    max-width: none;
  }
  .services-layout {
    flex-direction: column;
  }
  .services-tabs {
    flex: 0 0 auto;
    flex-direction: row;
    overflow-x: auto;
    gap: 6px;
    width: 100%;
    padding-bottom: 6px;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
  }
  .tab {
    width: auto;
    flex: 0 0 auto;
    white-space: nowrap;
    border-bottom: 0;
    background: var(--cream);
    min-height: 48px;
    padding: 12px 16px;
    border-radius: 14px;
  }
  .tab::after {
    display: none;
  }
  .tab.is-active {
    background: var(--ink);
    color: #fff;
  }
  .tab.is-active:hover {
    color: #fff;
  }
  .services-panels {
    width: 100%;
  }
  .panel {
    min-height: 0;
  }
}

@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }
  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    background: var(--cream);
    border-bottom: 1px solid var(--line);
    display: none;
    margin: 0;
    padding: 12px var(--pad) 20px;
  }
  .site-nav.is-open {
    display: block;
  }
  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
  }
  .nav-list a {
    min-height: 48px;
    display: flex;
    align-items: center;
    padding: 10px 4px;
    border-bottom: 1px solid var(--line);
  }
  .nav-cta {
    margin-top: 12px;
  }
  .nav-cta a {
    border-bottom: 0;
    justify-content: center;
  }
  .header-inner {
    position: relative;
  }
}

@media (max-width: 430px) {
  .brand-cn {
    font-size: 16px;
  }
  .brand-en {
    display: none;
  }
  .hero-actions {
    gap: 12px 18px;
  }
  .btn {
    padding: 12px 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  .js-float {
    animation: none;
  }
}

/* Final integration: shared brand surfaces and informational pages. */
::selection {
  background: #c4dec5;
  color: #123e28;
}
html {
  scrollbar-color: #9daa93 var(--bg);
}
.nav-list .btn {
  display: inline-flex;
  padding: 10px 20px;
  color: #fff;
}
.nav-list .btn:hover {
  color: #fff;
}
.filing {
  font-size: 13px;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  width: fit-content;
  text-underline-offset: 4px;
}
.filing:hover {
  text-decoration: underline;
}
.privacy-header,
.privacy-content,
.privacy-footer {
  width: min(840px, 100%);
  margin: auto;
  padding: 28px 24px;
}
.privacy-header a,
.privacy-footer a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  text-decoration: underline;
  text-underline-offset: 5px;
}
.privacy-content {
  padding-top: 48px;
  padding-bottom: 72px;
}
.privacy-content h1 {
  font-size: clamp(32px, 6vw, 48px);
  margin-bottom: 32px;
}
.privacy-content h2 {
  font-size: 22px;
  margin: 40px 0 16px;
}
.privacy-content p {
  line-height: 1.9;
}
.privacy-footer {
  border-top: 1px solid var(--line);
  font-size: 14px;
}
@media (min-width: 1280px) {
  :root {
    --wrap: 1328px;
    --pad: 64px;
  }
  .hero-art-inner {
    min-height: 410px;
  }
  .hero-art-logo {
    width: 95%;
  }
}