:root {
  --page: #f3f4f1;
  --surface: #ffffff;
  --ink: #1f2b28;
  --muted: #6e7772;
  --line: #d9ddd5;
  --green: #0f5b49;
  --green-dark: #163d31;
  --lime: #c8ff13;
  --soft-green: #eef8f1;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--page);
  font-family: "Inter", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
}

body.article-loading .page-shell,
body.article-loading .promo-banner,
body.article-loading .latest-section {
  opacity: 0;
}

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

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

button,
input {
  font: inherit;
}

.top-header {
  display: flex;
  min-height: 50px;
  align-items: center;
  justify-content: space-between;
  padding: 0 26px;
  color: #fff;
  background: #000;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
}

.brand-mark {
  display: grid;
  width: 30px;
  height: 30px;
  place-items: center;
  border-radius: 4px;
  color: #000;
  background: #fff;
  font-weight: 900;
}

.brand strong {
  font-size: 18px;
  letter-spacing: 0;
}

.brand em {
  border-left: 1px solid rgba(255, 255, 255, 0.38);
  padding-left: 14px;
  font-style: normal;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 18px;
  font-size: 14px;
}

.start-button {
  border-radius: 4px;
  padding: 8px 16px;
  color: #000;
  background: var(--lime);
  font-weight: 800;
}

.sub-nav {
  display: flex;
  min-height: 44px;
  align-items: center;
  gap: 20px;
  padding: 0 30px;
  border-bottom: 1px solid var(--line);
  color: #2d3834;
  background: #e5e6e3;
  font-size: 13px;
  position: relative;
  z-index: 40;
}

.sub-nav a::after {
  content: " ▼";
  font-size: 10px;
}

.sub-nav label {
  display: flex;
  min-height: 32px;
  align-items: center;
  gap: 8px;
  margin-left: auto;
  border: 1px solid #c8cbc4;
  border-radius: 4px;
  padding: 0 10px;
  background: #ededeb;
}

.sub-nav input {
  width: 120px;
  border: 0;
  outline: 0;
  background: transparent;
}

.sub-nav a::after {
  content: none;
}

.nav-menu {
  display: flex;
  align-items: stretch;
  gap: 28px;
}

.nav-group {
  position: relative;
  display: flex;
  align-items: center;
}

.nav-group > button,
.nav-direct {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  border: 0;
  padding: 0;
  color: #2d3834;
  background: transparent;
  font-size: 13px;
  cursor: pointer;
}

.nav-group > button::after {
  content: " ▼";
  font-size: 10px;
}

.nav-dropdown {
  position: absolute;
  top: 100%;
  left: -12px;
  z-index: 80;
  display: none;
  width: 210px;
  border: 1px solid #d4d8d0;
  border-radius: 4px;
  padding: 8px;
  background: #fff;
  box-shadow: 0 14px 34px rgba(31, 43, 40, 0.12);
}

.nav-group:hover .nav-dropdown,
.nav-group:focus-within .nav-dropdown {
  display: grid;
}

.nav-dropdown a {
  overflow: hidden;
  border-radius: 3px;
  padding: 8px 9px;
  color: #31403b;
  font-size: 13px;
  line-height: 1.25;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.nav-dropdown a:hover {
  color: var(--green);
  background: #eff4ee;
}

.page-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 34px;
  width: calc(100% - 72px);
  max-width: 1320px;
  margin: 0 auto;
  padding: 20px 0 44px;
}

.article-main {
  min-width: 0;
}

.hero-image {
  width: 100%;
  aspect-ratio: 1.5;
  object-fit: cover;
}

.article-meta-line {
  display: flex;
  gap: 12px;
  margin: 26px 0 8px;
  color: var(--green);
  font-size: 14px;
  font-weight: 800;
}

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

h1 {
  max-width: 980px;
  margin-bottom: 14px;
  font-size: clamp(24px, 2.2vw, 32px);
  line-height: 1.22;
  font-weight: 500;
  letter-spacing: 0;
}

.dek {
  max-width: 850px;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.65;
}

.byline {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 22px 0 28px;
}

.byline img {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  object-fit: cover;
}

.byline strong,
.byline span {
  display: block;
}

.byline span {
  color: var(--muted);
  font-size: 13px;
}

.article-copy {
  max-width: none;
}

.article-copy p,
.article-copy li {
  color: #33413d;
  font-size: 20px;
  line-height: 1.75;
}

.article-copy .lead {
  font-size: 21px;
}

.article-copy h2 {
  margin: 38px 0 12px;
  font-size: 30px;
  line-height: 1.2;
}

.article-copy h1,
.article-copy h3,
.article-copy h4 {
  margin: 30px 0 12px;
  color: #14231f;
  line-height: 1.25;
}

.article-copy img {
  width: auto;
  max-width: 100%;
  height: auto;
  margin: 22px auto;
  border-radius: 5px;
}

.article-copy figure,
.article-copy .pgc-img {
  margin: 26px 0;
}

.article-copy table {
  display: block;
  overflow-x: auto;
  width: 100%;
  border-collapse: collapse;
}

.article-copy td,
.article-copy th {
  border: 1px solid var(--line);
  padding: 10px;
}

.article-copy iframe,
.article-copy video {
  max-width: 100%;
}

.article-copy figcaption,
.article-copy .pgc-img-caption,
.article-copy .reference-list,
.article-copy .references,
.article-copy .article-references {
  color: #747d78;
  font-size: 13px;
  line-height: 1.65;
}

.article-copy .reference-list p,
.article-copy .reference-list li,
.article-copy .references p,
.article-copy .references li,
.article-copy .article-references p,
.article-copy .article-references li {
  font-size: 13px;
  line-height: 1.65;
}

.video-block {
  position: relative;
  overflow: hidden;
  margin: 34px 0;
}

.video-block img {
  width: 100%;
  aspect-ratio: 1.75;
  object-fit: cover;
}

.video-block span {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  color: #fff;
}

.video-block svg {
  width: 62px;
  height: 62px;
  fill: #e61b1b;
  stroke: #e61b1b;
}

blockquote {
  margin: 30px 0;
  border-left: 5px solid var(--green);
  padding: 16px 22px;
  color: var(--green-dark);
  background: #e9f0ea;
  font-size: 20px;
  line-height: 1.6;
}

.right-rail {
  display: grid;
  align-self: start;
  align-content: start;
  gap: 28px;
  position: sticky;
  top: 16px;
  max-height: calc(100vh - 32px);
  overflow: auto;
  padding-bottom: 2px;
  scrollbar-width: thin;
}

.subscribe-card,
.ai-card,
.contact-card {
  border: 1px solid var(--line);
  border-radius: 7px;
  padding: 22px;
  background: #f8f6ef;
}

.subscribe-card > span,
.ai-card > span,
.contact-card > span {
  color: var(--muted);
  font-size: 11px;
  font-weight: 800;
  text-transform: uppercase;
}

.subscribe-card h2,
.ai-card h2,
.contact-card h2 {
  margin: 12px 0;
  font-size: 18px;
  line-height: 1.35;
}

.hot-list {
  display: grid;
  gap: 8px;
  margin-top: 14px;
}

.hot-list a {
  display: block;
  overflow: hidden;
  border-top: 1px solid #e2e4dd;
  padding: 10px 0 2px;
  color: #20322d;
  font-size: 14px;
  font-weight: 700;
  line-height: 1.3;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.hot-list a:first-child {
  border-top: 0;
  padding-top: 0;
}

.hot-list a:hover {
  color: var(--green);
}

.subscribe-card input {
  width: 100%;
  min-height: 46px;
  margin: 8px 0 14px;
  border: 1px solid #d2d3ce;
  border-radius: 5px;
  padding: 0 14px;
  background: #fff;
}

.subscribe-card button,
.ai-card button {
  width: 100%;
  min-height: 42px;
  border: 0;
  border-radius: 5px;
  color: #fff;
  background: var(--green-dark);
  font-weight: 800;
}

.subscribe-card p,
.ai-card p,
.contact-card p {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.55;
}

.ai-card {
  background: var(--soft-green);
}

.ai-demo {
  display: grid;
  gap: 10px;
  min-height: 260px;
  margin: 16px 0;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 16px;
  background: rgba(255, 255, 255, 0.82);
}

.ai-demo strong,
.ai-demo small {
  display: block;
}

.ai-demo small {
  color: var(--muted);
}

.ai-demo p {
  width: fit-content;
  max-width: 92%;
  margin: 0;
  border-radius: 10px;
  padding: 8px 10px;
  color: #45534f;
  background: #f0f2ee;
  font-size: 12px;
}

.contact-card a {
  display: inline-flex;
  border-radius: 5px;
  padding: 9px 12px;
  color: #fff;
  background: var(--green-dark);
  font-size: 14px;
  font-weight: 800;
}

.promo-banner,
.latest-section {
  max-width: 1320px;
  margin: 0 auto;
}

.promo-banner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 28px;
  align-items: center;
  width: calc(100% - 72px);
  margin-bottom: 22px;
  border: 1px solid #d2dfd5;
  padding: 28px 34px;
  color: var(--ink);
  background: #eef6ef;
}

.promo-banner span {
  color: var(--green);
  font-size: 12px;
  font-weight: 800;
}

.promo-banner h2 {
  max-width: 760px;
  margin: 8px 0;
  font-size: 30px;
  line-height: 1.2;
}

.promo-banner p {
  max-width: 720px;
  margin: 0;
  color: #5f6c67;
  line-height: 1.7;
}

.promo-banner a {
  display: inline-flex;
  min-height: 42px;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
  padding: 0 18px;
  color: #fff;
  background: var(--green-dark);
  font-size: 14px;
  font-weight: 900;
  white-space: nowrap;
}

.latest-section {
  width: calc(100% - 72px);
  margin-bottom: 32px;
}

.section-titlebar {
  display: flex;
  min-height: 58px;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 0 28px;
  color: #fff;
  background: #171917;
}

.section-titlebar h2 {
  margin: 0;
  font-size: 18px;
  line-height: 1.25;
}

.section-titlebar a {
  font-size: 14px;
  font-weight: 800;
  white-space: nowrap;
}

.latest-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-bottom: 1px solid var(--line);
  background: #f7f8f6;
}

.latest-card {
  display: grid;
  grid-template-rows: auto auto auto 1fr;
  min-height: 338px;
  border-right: 1px solid var(--line);
  padding: 24px 18px 20px;
}

.latest-card:last-child {
  border-right: 0;
}

.latest-card span {
  margin-bottom: 12px;
  color: var(--green);
  font-size: 12px;
  font-weight: 900;
}

.latest-card img {
  width: 100%;
  aspect-ratio: 1.55;
  object-fit: cover;
  border-radius: 5px;
  background: #e0e4dd;
}

.latest-card h3 {
  margin: 12px 0 6px;
  color: #18322b;
  font-size: 17px;
  line-height: 1.4;
  font-weight: 500;
}

.latest-card p {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin: 0;
  color: #8a918d;
  font-size: 12px;
}

.views {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: #1f2b28;
  white-space: nowrap;
}

.views svg {
  width: 15px;
  height: 15px;
}

.article-footer {
  display: grid;
  grid-template-columns: minmax(260px, 1.4fr) repeat(3, minmax(150px, 0.7fr));
  gap: 30px;
  width: 100%;
  max-width: none;
  margin: 0;
  padding: 38px max(30px, calc((100vw - 1320px) / 2 + 30px)) 26px;
  border-top: 1px solid var(--line);
  color: #c5cbc7;
  background: #101613;
}

.article-footer strong {
  display: block;
  margin-bottom: 12px;
  color: #fff;
  font-size: 15px;
}

.footer-brand strong {
  font-size: 20px;
}

.footer-brand p {
  max-width: 390px;
  margin: 0;
  color: #aab2ad;
  font-size: 14px;
  line-height: 1.7;
}

.article-footer nav,
.footer-contact {
  display: grid;
  align-content: start;
  gap: 9px;
}

.article-footer nav a,
.footer-contact a,
.footer-contact span {
  color: #aab2ad;
  font-size: 13px;
}

.article-footer a:hover {
  color: #fff;
}

.footer-legal {
  display: flex;
  grid-column: 1 / -1;
  justify-content: space-between;
  gap: 18px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding-top: 18px;
  color: #8b958f;
  font-size: 12px;
}

.footer-legal > span:last-child {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px 18px;
}

svg {
  width: 18px;
  height: 18px;
  stroke-width: 2;
}

@media (max-width: 980px) {
  .page-shell {
    grid-template-columns: 1fr;
    width: auto;
    margin-right: 18px;
    margin-left: 18px;
  }

  .promo-banner {
    grid-template-columns: 1fr;
    width: auto;
    margin-right: 18px;
    margin-left: 18px;
  }

  .latest-section {
    width: auto;
    margin-right: 18px;
    margin-left: 18px;
  }

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

  .latest-card:nth-child(2n) {
    border-right: 0;
  }

  .latest-card:nth-child(-n + 2) {
    border-bottom: 1px solid var(--line);
  }

  .article-footer {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    padding-right: 24px;
    padding-left: 24px;
  }

  .footer-brand {
    grid-column: 1 / -1;
  }

  .right-rail {
    position: static;
    grid-template-columns: repeat(2, 1fr);
    max-height: none;
    overflow: visible;
  }

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

@media (max-width: 680px) {
  .top-header,
  .sub-nav {
    align-items: flex-start;
    flex-direction: column;
    padding: 12px 18px;
  }

  .sub-nav {
    gap: 12px;
  }

  .nav-menu {
    flex-wrap: wrap;
    gap: 10px 18px;
  }

  .nav-group > button,
  .nav-direct {
    min-height: 32px;
  }

  .nav-dropdown {
    left: 0;
    width: min(240px, calc(100vw - 36px));
  }

  .sub-nav label {
    width: 100%;
    margin-left: 0;
  }

  .sub-nav input {
    width: 100%;
  }

  .page-shell {
    padding: 18px 0 34px;
  }

  .promo-banner,
  .latest-section {
    margin-right: 18px;
    margin-left: 18px;
  }

  .promo-banner {
    padding: 24px 20px;
  }

  .promo-banner h2 {
    font-size: 24px;
  }

  .section-titlebar {
    min-height: auto;
    align-items: flex-start;
    flex-direction: column;
    padding: 16px 18px;
  }

  .latest-grid,
  .article-footer {
    grid-template-columns: 1fr;
  }

  .article-footer {
    padding: 30px 20px 24px;
  }

  .latest-card {
    min-height: auto;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .latest-card:last-child {
    border-bottom: 0;
  }

  .footer-brand,
  .footer-legal {
    grid-column: auto;
  }

  .footer-legal {
    flex-direction: column;
  }

  .footer-legal > span:last-child {
    justify-content: flex-start;
  }

  h1 {
    font-size: 34px;
  }

  .article-copy p,
  .article-copy li,
  .article-copy .lead {
    font-size: 17px;
  }

  .right-rail {
    grid-template-columns: 1fr;
  }
}