:root {
  --ch-ink: #08283a;
  --ch-ink-2: #123d4f;
  --ch-teal: #0b6f70;
  --ch-teal-light: #48a7a1;
  --ch-sand: #e9a23b;
  --ch-paper: #fbfcfa;
  --ch-mist: #edf3f2;
  --ch-line: #d4e0de;
  --ch-text: #17313f;
  --ch-muted: #5f737b;
  --ch-white: #ffffff;
  --ch-radius: 18px;
  --ch-shadow: 0 22px 60px rgba(8, 40, 58, 0.12);
  --ch-container: min(1240px, calc(100vw - 40px));
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--ch-paper);
  color: var(--ch-text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.75;
  text-rendering: optimizeLegibility;
}

body.admin-bar .site-header {
  top: 32px;
}

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

a {
  color: var(--ch-teal);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

button,
input,
select,
textarea {
  font: inherit;
}

h1,
h2,
h3 {
  margin-top: 0;
  color: var(--ch-ink);
  font-weight: 750;
  line-height: 1.16;
  letter-spacing: -0.025em;
}

h1 {
  font-size: clamp(2.5rem, 5vw, 5.25rem);
}

h2 {
  font-size: clamp(2rem, 3.5vw, 3.25rem);
}

h3 {
  font-size: clamp(1.2rem, 2vw, 1.55rem);
}

p {
  margin: 0 0 1.25rem;
}

.container {
  width: var(--ch-container);
  margin-inline: auto;
}

.screen-reader-text {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  z-index: 10000;
  top: 12px;
  left: 12px;
  padding: 10px 16px;
  transform: translateY(-140%);
  background: var(--ch-white);
  color: var(--ch-ink);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: sticky;
  z-index: 1000;
  top: 0;
  border-bottom: 1px solid rgba(212, 224, 222, 0.72);
  background: rgba(251, 252, 250, 0.92);
  backdrop-filter: blur(14px);
  transition: box-shadow 180ms ease;
}

.site-header.is-scrolled {
  box-shadow: 0 10px 30px rgba(8, 40, 58, 0.08);
}

.site-header__bar {
  display: flex;
  align-items: center;
  gap: 28px;
  width: var(--ch-container);
  min-height: 78px;
  margin-inline: auto;
}

.brand {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 12px;
  color: var(--ch-ink);
  text-decoration: none;
}

.brand__mark {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  border-radius: 12px 12px 4px 12px;
  background: var(--ch-teal);
  color: var(--ch-white);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.brand__text strong {
  font-size: 1.08rem;
  letter-spacing: 0.08em;
}

.brand__text small {
  margin-top: 4px;
  color: var(--ch-muted);
  font-size: 0.68rem;
}

.site-nav {
  margin-left: auto;
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(14px, 1.8vw, 28px);
  padding: 0;
  margin: 0;
  list-style: none;
}

.site-nav__list a {
  position: relative;
  color: var(--ch-text);
  font-size: 0.92rem;
  font-weight: 620;
  text-decoration: none;
}

.site-nav__list a::after {
  position: absolute;
  right: 0;
  bottom: -8px;
  left: 0;
  height: 2px;
  content: "";
  transform: scaleX(0);
  transform-origin: left;
  background: var(--ch-sand);
  transition: transform 160ms ease;
}

.site-nav__list a:hover::after,
.site-nav__list .current-menu-item > a::after {
  transform: scaleX(1);
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 10px;
  border: 0;
  background: transparent;
}

.nav-toggle > span:not(.screen-reader-text) {
  display: block;
  width: 100%;
  height: 2px;
  margin: 5px 0;
  background: var(--ch-ink);
}

.button {
  display: inline-flex;
  min-height: 50px;
  align-items: center;
  justify-content: center;
  padding: 0.8rem 1.35rem;
  border: 1px solid var(--ch-sand);
  border-radius: 999px;
  background: var(--ch-sand);
  color: var(--ch-ink);
  font-weight: 740;
  text-decoration: none;
  transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

.button:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 24px rgba(233, 162, 59, 0.22);
}

.button--small {
  min-height: 42px;
  padding-inline: 1.05rem;
  font-size: 0.9rem;
}

.button--ghost {
  border-color: rgba(255, 255, 255, 0.42);
  background: rgba(255, 255, 255, 0.08);
  color: var(--ch-white);
}

.button--outline {
  border-color: var(--ch-teal);
  background: transparent;
  color: var(--ch-teal);
}

.button--light {
  border-color: var(--ch-white);
  background: var(--ch-white);
  color: var(--ch-ink);
}

.button--full {
  width: 100%;
}

.button-group {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.eyebrow {
  margin-bottom: 0.75rem;
  color: var(--ch-sand);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.hero {
  position: relative;
  overflow: hidden;
  padding: clamp(72px, 9vw, 132px) 0 0;
  background:
    radial-gradient(circle at 82% 20%, rgba(72, 167, 161, 0.32), transparent 28%),
    linear-gradient(135deg, #061f30 0%, #0a3445 58%, #0b5960 100%);
  color: rgba(255, 255, 255, 0.84);
}

.hero__mesh {
  position: absolute;
  inset: 0;
  opacity: 0.13;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.18) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.18) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: linear-gradient(to bottom, #000, transparent 86%);
}

.hero__inner {
  position: relative;
  display: grid;
  align-items: center;
  gap: clamp(36px, 6vw, 92px);
  grid-template-columns: minmax(0, 1.05fr) minmax(360px, 0.95fr);
}

.hero h1 {
  max-width: 850px;
  margin-bottom: 1.35rem;
  color: var(--ch-white);
}

.hero__lead {
  max-width: 720px;
  margin-bottom: 2rem;
  font-size: clamp(1.02rem, 1.5vw, 1.28rem);
}

.hero__visual {
  min-height: 460px;
  align-self: stretch;
}

.hero__visual img,
.hero__placeholder {
  width: 100%;
  height: 100%;
  min-height: 460px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 120px 22px 22px 22px;
  box-shadow: 0 36px 80px rgba(0, 0, 0, 0.28);
  object-fit: cover;
}

.hero__placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.11), rgba(255, 255, 255, 0.02)),
    repeating-linear-gradient(135deg, transparent 0 28px, rgba(255, 255, 255, 0.035) 28px 29px);
  color: rgba(255, 255, 255, 0.75);
  text-align: center;
}

.hero__placeholder span {
  font-size: 1.35rem;
  font-weight: 700;
}

.hero__placeholder small {
  margin-top: 8px;
}

.hero__facts {
  position: relative;
  display: grid;
  margin-top: clamp(56px, 7vw, 88px);
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  grid-template-columns: repeat(4, 1fr);
}

.hero__facts span {
  padding: 22px 20px;
  border-right: 1px solid rgba(255, 255, 255, 0.15);
  font-size: 0.9rem;
  font-weight: 650;
  text-align: center;
}

.hero__facts span:last-child {
  border-right: 0;
}

.section {
  padding: clamp(72px, 9vw, 128px) 0;
}

.section--dark {
  background: var(--ch-ink);
  color: rgba(255, 255, 255, 0.74);
}

.section--dark h2,
.section--dark h3 {
  color: var(--ch-white);
}

.section--mist {
  background: var(--ch-mist);
}

.section--content {
  border-top: 1px solid var(--ch-line);
}

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 32px;
  margin-bottom: 42px;
}

.section-heading h2 {
  max-width: 850px;
  margin-bottom: 0;
}

.text-link {
  flex: 0 0 auto;
  font-weight: 720;
  text-decoration: none;
}

.text-link::after {
  margin-left: 0.4em;
  content: "↗";
}

.text-link--light {
  color: var(--ch-white);
}

.card-grid {
  display: grid;
  gap: 22px;
}

.card-grid--4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.card-grid--3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

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

.card {
  overflow: hidden;
  border: 1px solid var(--ch-line);
  border-radius: var(--ch-radius);
  background: var(--ch-white);
  box-shadow: 0 1px 0 rgba(8, 40, 58, 0.02);
  transition: transform 180ms ease, box-shadow 180ms ease;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: var(--ch-shadow);
}

.card__media {
  display: block;
  overflow: hidden;
  aspect-ratio: 3 / 2;
  background: linear-gradient(145deg, var(--ch-mist), #dce8e6);
  text-decoration: none;
}

.card__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 350ms ease;
}

.card:hover .card__media img {
  transform: scale(1.035);
}

.card__media-placeholder {
  display: grid;
  height: 100%;
  place-items: center;
  color: rgba(8, 40, 58, 0.28);
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: 0.1em;
}

.card__body,
.card--placeholder {
  padding: 24px;
}

.card__index {
  display: inline-block;
  margin-bottom: 18px;
  color: var(--ch-teal);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.card__title {
  margin-bottom: 12px;
  font-size: 1.3rem;
}

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

.card p {
  color: var(--ch-muted);
  font-size: 0.94rem;
}

.card--placeholder {
  min-height: 230px;
}

.card--placeholder h3 {
  margin-bottom: 12px;
}

.system-grid {
  display: grid;
  gap: 1px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.13);
  border-radius: var(--ch-radius);
  background: rgba(255, 255, 255, 0.13);
  grid-template-columns: repeat(3, 1fr);
}

.system-card {
  min-height: 245px;
  padding: 34px;
  background: #0a3042;
}

.system-card > span {
  color: var(--ch-sand);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.14em;
}

.system-card h3 {
  margin: 56px 0 12px;
}

.system-card p {
  margin-bottom: 0;
}

.split {
  display: grid;
  align-items: start;
  gap: clamp(50px, 8vw, 120px);
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
}

.split > div:first-child {
  position: sticky;
  top: 120px;
}

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

.process-list li {
  display: grid;
  gap: 20px;
  padding: 24px 0;
  border-bottom: 1px solid var(--ch-line);
  grid-template-columns: 64px 1fr;
}

.process-list li > span {
  color: var(--ch-teal);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.12em;
}

.process-list strong {
  display: block;
  margin-bottom: 4px;
  color: var(--ch-ink);
  font-size: 1.15rem;
}

.process-list p {
  margin: 0;
  color: var(--ch-muted);
}

.page-hero {
  padding: clamp(64px, 8vw, 116px) 0;
  background:
    linear-gradient(135deg, rgba(11, 111, 112, 0.1), transparent 60%),
    var(--ch-mist);
}

.page-hero h1 {
  max-width: 980px;
  margin: 1.2rem 0 0;
  font-size: clamp(2.35rem, 5vw, 4.6rem);
}

.page-hero__lead {
  max-width: 820px;
  margin: 1.2rem 0 0;
  color: var(--ch-muted);
  font-size: 1.15rem;
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  color: var(--ch-muted);
  font-size: 0.82rem;
}

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

.status-label {
  display: inline-flex;
  padding: 6px 11px;
  margin: 24px 0 0;
  border: 1px solid rgba(11, 111, 112, 0.25);
  border-radius: 999px;
  background: rgba(11, 111, 112, 0.08);
  color: var(--ch-teal);
  font-size: 0.76rem;
  font-weight: 700;
}

.detail-cover {
  overflow: hidden;
  max-height: 680px;
  margin-top: -42px;
  border-radius: var(--ch-radius);
  box-shadow: var(--ch-shadow);
}

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

.detail-layout {
  display: grid;
  align-items: start;
  gap: 64px;
  grid-template-columns: minmax(0, 1fr) 320px;
}

.detail-aside {
  position: sticky;
  top: 116px;
}

.aside-card {
  padding: 28px;
  border-radius: var(--ch-radius);
  background: var(--ch-ink);
  color: rgba(255, 255, 255, 0.75);
}

.aside-card h2 {
  color: var(--ch-white);
  font-size: 1.55rem;
}

.prose {
  max-width: 860px;
}

.detail-layout .prose {
  max-width: none;
}

.prose > *:first-child {
  margin-top: 0;
}

.prose h2 {
  padding-top: 2.6rem;
  margin-bottom: 1.1rem;
  font-size: clamp(1.65rem, 2.8vw, 2.35rem);
}

.prose h3 {
  padding-top: 1.6rem;
  margin-bottom: 0.8rem;
}

.prose p,
.prose li {
  color: #304a56;
}

.prose ul,
.prose ol {
  padding-left: 1.4rem;
}

.prose li {
  margin-bottom: 0.55rem;
}

.prose blockquote {
  padding: 20px 24px;
  margin: 2rem 0;
  border-left: 4px solid var(--ch-sand);
  background: var(--ch-mist);
}

.prose table {
  width: 100%;
  margin: 2rem 0;
  border-collapse: collapse;
  font-size: 0.92rem;
}

.prose th,
.prose td {
  padding: 12px 14px;
  border: 1px solid var(--ch-line);
  text-align: left;
  vertical-align: top;
}

.prose th {
  background: var(--ch-mist);
  color: var(--ch-ink);
}

.prose img {
  border-radius: 12px;
}

.changhe-form {
  display: grid;
  gap: 22px;
  padding: clamp(24px, 5vw, 48px);
  border: 1px solid var(--ch-line);
  border-radius: var(--ch-radius);
  background: var(--ch-white);
  box-shadow: var(--ch-shadow);
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.changhe-form__field {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.changhe-form__field--full {
  grid-column: 1 / -1;
}

.changhe-form label {
  color: var(--ch-ink);
  font-size: 0.9rem;
  font-weight: 700;
}

.changhe-form input:not([type="checkbox"]),
.changhe-form select,
.changhe-form textarea {
  width: 100%;
  min-height: 48px;
  padding: 10px 12px;
  border: 1px solid #b9cbca;
  border-radius: 8px;
  background: var(--ch-paper);
  color: var(--ch-text);
}

.changhe-form textarea {
  min-height: 140px;
  resize: vertical;
}

.changhe-form input:not([type="checkbox"]):focus,
.changhe-form select:focus,
.changhe-form textarea:focus {
  border-color: var(--ch-teal);
  outline: 3px solid rgba(11, 111, 112, 0.12);
}

.changhe-form input[type="checkbox"] {
  width: 1rem;
  height: 1rem;
  margin: 0 0.45rem 0 0;
  accent-color: var(--ch-teal);
}

.changhe-form small {
  color: var(--ch-muted);
}

.section--form .section-heading p {
  max-width: 780px;
}

.changhe-form__notice {
  grid-column: 1 / -1;
  padding: 12px 14px;
  border-radius: 8px;
  background: #e4f3ec;
  color: #225b45;
}

.footer-cta {
  padding: 56px 0;
  background: var(--ch-teal);
  color: rgba(255, 255, 255, 0.82);
}

.footer-cta__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
}

.footer-cta h2 {
  max-width: 760px;
  margin-bottom: 10px;
  color: var(--ch-white);
  font-size: clamp(1.8rem, 3vw, 2.65rem);
}

.footer-cta p:last-child {
  margin-bottom: 0;
}

.site-footer {
  padding: 72px 0 26px;
  background: #051c2a;
  color: rgba(255, 255, 255, 0.65);
}

.site-footer a {
  color: rgba(255, 255, 255, 0.84);
}

.site-footer__grid {
  display: grid;
  gap: 64px;
  grid-template-columns: 1.5fr 0.7fr 1fr;
}

.brand--footer {
  margin-bottom: 24px;
  color: var(--ch-white);
}

.brand--footer .brand__text small {
  color: rgba(255, 255, 255, 0.55);
}

.site-footer h2 {
  color: var(--ch-white);
  font-size: 1rem;
}

.site-footer ul {
  padding: 0;
  list-style: none;
}

.site-footer li {
  margin-bottom: 8px;
}

.site-footer__bottom {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  padding-top: 24px;
  margin-top: 52px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  font-size: 0.8rem;
}

.not-found {
  display: grid;
  min-height: 70vh;
  place-items: center;
  padding: 80px 0;
  text-align: center;
}

.not-found__code {
  margin: 0;
  color: var(--ch-sand);
  font-size: clamp(5rem, 16vw, 11rem);
  font-weight: 900;
  line-height: 0.9;
}

.not-found .button-group {
  justify-content: center;
}

.pagination {
  margin-top: 46px;
}

@media (max-width: 1120px) {
  .header-cta {
    display: none;
  }

  .hero__inner {
    grid-template-columns: 1fr 0.85fr;
  }

  .card-grid--4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 920px) {
  body.admin-bar .site-header {
    top: 46px;
  }

  .nav-toggle {
    display: block;
    margin-left: auto;
  }

  .site-nav {
    position: absolute;
    top: calc(100% + 1px);
    right: 0;
    left: 0;
    display: none;
    padding: 18px 20px 24px;
    border-bottom: 1px solid var(--ch-line);
    background: var(--ch-paper);
    box-shadow: 0 24px 48px rgba(8, 40, 58, 0.12);
  }

  .site-nav.is-open {
    display: block;
  }

  .site-nav__list {
    align-items: stretch;
    flex-direction: column;
    gap: 0;
  }

  .site-nav__list a {
    display: block;
    padding: 11px 0;
  }

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

  .hero__visual {
    min-height: 380px;
  }

  .hero__visual img,
  .hero__placeholder {
    min-height: 380px;
    border-radius: 64px 18px 18px 18px;
  }

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

  .card-grid--3 {
    grid-template-columns: repeat(2, 1fr);
  }

  .split,
  .detail-layout {
    grid-template-columns: 1fr;
  }

  .split > div:first-child,
  .detail-aside {
    position: static;
  }

  .detail-aside {
    order: -1;
  }
}

@media (max-width: 680px) {
  :root {
    --ch-container: min(100% - 28px, 1240px);
  }

  .brand__text small {
    display: none;
  }

  .site-header__bar {
    min-height: 68px;
  }

  .hero {
    padding-top: 60px;
  }

  .hero h1 {
    font-size: clamp(2.35rem, 12vw, 3.5rem);
  }

  .hero__visual,
  .hero__visual img,
  .hero__placeholder {
    min-height: 300px;
  }

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

  .hero__facts span:nth-child(2) {
    border-right: 0;
  }

  .hero__facts span:nth-child(-n + 2) {
    border-bottom: 1px solid rgba(255, 255, 255, 0.15);
  }

  .section-heading,
  .footer-cta__inner {
    align-items: flex-start;
    flex-direction: column;
  }

  .card-grid--4,
  .card-grid--3,
  .card-grid--2,
  .system-grid,
  .site-footer__grid,
  .changhe-form {
    grid-template-columns: 1fr;
  }

  .system-card {
    min-height: 200px;
  }

  .system-card h3 {
    margin-top: 34px;
  }

  .process-list li {
    grid-template-columns: 48px 1fr;
  }

  .site-footer__bottom {
    flex-direction: column;
  }

  .changhe-form__field--full {
    grid-column: auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}