/* corp-portal — ink & paper corporate portal */

:root {
  --corp-ink: #0b1f2a;
  --corp-ink-soft: #122a38;
  --corp-paper: #f7f4ef;
  --corp-paper-deep: #f0ebe3;
  --corp-bronze: #b08d57;
  --corp-bronze-soft: rgba(176, 141, 87, 0.35);
  --corp-text: #1a2830;
  --corp-text-muted: #5c6b73;
  --corp-on-ink: #f7f4ef;
  --corp-on-ink-muted: rgba(247, 244, 239, 0.72);
  --corp-font-sans: "DM Sans", "PingFang SC", "Microsoft YaHei", sans-serif;
  --corp-font-serif: "Noto Serif SC", "Songti SC", serif;
  --corp-max: 102rem;
  --corp-ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html { scroll-behavior: smooth; }

html, body { height: 100%; }

body.corp-portal {
  margin: 0;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  font-family: var(--corp-font-sans);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--corp-text);
  background-color: var(--corp-paper);
  background-image:
    radial-gradient(ellipse 90% 60% at 50% -10%, rgba(176, 141, 87, 0.07), transparent 55%),
    linear-gradient(180deg, var(--corp-paper) 0%, var(--corp-paper-deep) 100%);
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--corp-ink);
  text-decoration: none;
  transition: color 0.2s var(--corp-ease);
}

a:hover { color: var(--corp-bronze); }

.corp-container {
  width: 100%;
  max-width: var(--corp-max);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.corp-main {
  flex: 1 1 auto;
  width: 100%;
}

.corp-portal--page .corp-main {
  max-width: var(--corp-max);
  margin: 0 auto;
  padding: 2.5rem 1.5rem 3rem;
}

.corp-portal--home .corp-main {
  padding: 0;
  max-width: none;
}

/* ── Header (inner pages) ─────────────────────────────────── */

.corp-header {
  background: var(--corp-ink);
  color: var(--corp-on-ink);
  border-bottom: 1px solid rgba(176, 141, 87, 0.2);
}

.corp-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  min-height: 3.5rem;
  flex-wrap: wrap;
  padding: 0.625rem 0;
}

.corp-header-feeds {
  display: flex;
  gap: 0.85rem;
  font-size: 0.8125rem;
}

.corp-header-feeds a {
  color: rgba(255, 255, 255, 0.72);
  text-decoration: none;
}

.corp-header-feeds a:hover {
  color: #fff;
}

.corp-logo {
  font-family: var(--corp-font-serif);
  font-size: 1.0625rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--corp-on-ink);
}

.corp-logo:hover {
  color: var(--corp-bronze);
  text-decoration: none;
}

.corp-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.75rem;
  font-size: 0.875rem;
  font-weight: 500;
}

.corp-nav-link {
  position: relative;
  color: var(--corp-on-ink-muted);
  padding: 0.25rem 0;
}

.corp-nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: var(--corp-bronze);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.28s var(--corp-ease);
}

.corp-nav-link:hover,
.corp-nav-link.is-active {
  color: var(--corp-on-ink);
  text-decoration: none;
}

.corp-nav-link:hover::after,
.corp-nav-link.is-active::after {
  transform: scaleX(1);
}

/* ── KB nav (header + hero) ───────────────────────────────── */

.corp-kb-nav {
  position: relative;
}

.corp-kb-nav-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.25rem 1.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.corp-kb-nav-item {
  position: relative;
}

.corp-kb-nav-label {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  margin: 0;
  padding: 0.25rem 0;
  border: none;
  background: none;
  font: inherit;
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--corp-on-ink-muted);
  cursor: default;
  transition: color 0.2s var(--corp-ease);
}

.corp-kb-nav-label::after {
  content: "";
  display: inline-block;
  width: 0.4em;
  height: 0.4em;
  margin-top: -0.1em;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(45deg);
  opacity: 0.55;
  transition: transform 0.2s var(--corp-ease), opacity 0.2s;
}

.corp-kb-nav-item:hover .corp-kb-nav-label,
.corp-kb-nav-item:focus-within .corp-kb-nav-label,
.corp-kb-nav-item.is-open .corp-kb-nav-label {
  color: var(--corp-on-ink);
}

.corp-kb-nav-item:hover .corp-kb-nav-label::after,
.corp-kb-nav-item:focus-within .corp-kb-nav-label::after,
.corp-kb-nav-item.is-open .corp-kb-nav-label::after {
  opacity: 1;
  transform: rotate(225deg);
}

.corp-kb-nav-label::before {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: var(--corp-bronze);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.28s var(--corp-ease);
}

.corp-kb-nav-item:hover .corp-kb-nav-label::before,
.corp-kb-nav-item:focus-within .corp-kb-nav-label::before,
.corp-kb-nav-item.is-open .corp-kb-nav-label::before {
  transform: scaleX(1);
}

.corp-kb-nav-menu {
  position: absolute;
  top: calc(100% + 0.35rem);
  left: 0;
  z-index: 40;
  min-width: 12rem;
  margin: 0;
  padding: 0.35rem 0;
  list-style: none;
  background: var(--corp-ink-soft);
  border: 1px solid rgba(176, 141, 87, 0.25);
  border-radius: 3px;
  box-shadow: 0 8px 24px rgba(11, 31, 42, 0.35);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition: opacity 0.22s var(--corp-ease), transform 0.22s var(--corp-ease), visibility 0.22s;
}

.corp-kb-nav-item:hover .corp-kb-nav-menu,
.corp-kb-nav-item:focus-within .corp-kb-nav-menu,
.corp-kb-nav-item.is-open .corp-kb-nav-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.corp-kb-nav-link {
  display: block;
  padding: 0.5rem 1rem;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--corp-on-ink-muted);
  white-space: nowrap;
  transition: color 0.2s, background 0.2s, padding-left 0.2s;
}

.corp-kb-nav-link:hover,
.corp-kb-nav-link.is-active {
  color: var(--corp-on-ink);
  background: rgba(176, 141, 87, 0.12);
  padding-left: 1.15rem;
  text-decoration: none;
  border-left: 2px solid var(--corp-bronze);
}

.corp-kb-nav--hero {
  animation: corp-rise 0.9s var(--corp-ease) 0.32s both;
}

.corp-kb-nav--hero .corp-kb-nav-list {
  justify-content: center;
  gap: 0.5rem 2rem;
}

.corp-kb-nav--hero .corp-kb-nav-label {
  font-size: 0.9375rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--corp-on-ink);
}

.corp-kb-nav--hero .corp-kb-nav-label::before {
  transform: scaleX(0.35);
  opacity: 0.65;
  transform-origin: center;
}

.corp-kb-nav--hero .corp-kb-nav-item:hover .corp-kb-nav-label,
.corp-kb-nav--hero .corp-kb-nav-item:focus-within .corp-kb-nav-label,
.corp-kb-nav--hero .corp-kb-nav-item.is-open .corp-kb-nav-label {
  color: var(--corp-bronze);
}

.corp-kb-nav--hero .corp-kb-nav-item:hover .corp-kb-nav-label::before,
.corp-kb-nav--hero .corp-kb-nav-item:focus-within .corp-kb-nav-label::before,
.corp-kb-nav--hero .corp-kb-nav-item.is-open .corp-kb-nav-label::before {
  transform: scaleX(1);
  opacity: 1;
}

/* ── Home hero ────────────────────────────────────────────── */

.corp-hero {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: min(100vh, 100dvh);
  padding: 4rem 1.5rem 5rem;
  overflow: hidden;
  color: var(--corp-on-ink);
  background: var(--corp-ink);
  animation: corp-fade-in 0.85s var(--corp-ease) both;
}

.corp-hero-plane {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 70% 55% at 75% 15%, rgba(176, 141, 87, 0.14), transparent 60%),
    radial-gradient(ellipse 50% 40% at 10% 80%, rgba(255, 255, 255, 0.04), transparent 55%),
    linear-gradient(168deg, var(--corp-ink) 0%, var(--corp-ink-soft) 48%, var(--corp-ink) 100%);
  pointer-events: none;
}

.corp-hero-inner {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 42rem;
  text-align: center;
}

.corp-hero-brand {
  font-family: var(--corp-font-serif);
  font-size: clamp(2.75rem, 8vw, 4.5rem);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: 0.04em;
  margin: 0 0 1.25rem;
  animation: corp-rise 0.9s var(--corp-ease) 0.12s both;
}

.corp-hero-tagline {
  font-size: clamp(1rem, 2.5vw, 1.1875rem);
  line-height: 1.7;
  color: var(--corp-on-ink-muted);
  margin: 0 auto 2.75rem;
  max-width: 32rem;
  animation: corp-rise 0.9s var(--corp-ease) 0.22s both;
}

/* ── Home index (sectioned links) ─────────────────────────── */

.corp-index {
  padding: 3rem 0 4rem;
}

.corp-link-group + .corp-link-group {
  margin-top: 2.5rem;
}

.corp-link-group-label {
  font-family: var(--corp-font-serif);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--corp-text-muted);
  margin: 0 0 0.75rem;
}

.corp-link-rows {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--corp-bronze-soft);
}

.corp-link-rows li {
  border-bottom: 1px solid var(--corp-bronze-soft);
}

.corp-link-rows a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.875rem 0;
  font-size: 1.0625rem;
  font-weight: 500;
  color: var(--corp-text);
  transition: padding-left 0.25s var(--corp-ease), color 0.2s;
}

.corp-link-rows a::after {
  content: "→";
  font-size: 0.875rem;
  color: var(--corp-bronze);
  opacity: 0;
  transform: translateX(-4px);
  transition: opacity 0.25s var(--corp-ease), transform 0.25s var(--corp-ease);
}

.corp-link-rows a:hover {
  padding-left: 0.35rem;
  color: var(--corp-bronze);
  text-decoration: none;
}

.corp-link-rows a:hover::after {
  opacity: 1;
  transform: translateX(0);
}

/* ── Article page ─────────────────────────────────────────── */

.corp-article {
  max-width: 69rem;
  margin: 0 auto;
}

.corp-article-head h1 {
  font-family: var(--corp-font-serif);
  font-size: clamp(1.75rem, 4vw, 2.375rem);
  font-weight: 600;
  line-height: 1.25;
  color: var(--corp-ink);
  margin: 0 0 1rem;
}

.corp-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem 0.45rem;
  margin: 0 0 0.75rem;
  font-size: 0.8125rem;
  color: var(--corp-text-muted);
}

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

.corp-breadcrumb a:hover {
  color: var(--corp-ink);
}

.corp-article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
  font-size: 0.8125rem;
  color: var(--corp-text-muted);
  margin-bottom: 2rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--corp-bronze-soft);
}

.corp-article-body {
  font-size: 1.0125rem;
}

.corp-article-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(10rem, 14rem);
  gap: 2rem;
  align-items: start;
}

.corp-toc {
  position: sticky;
  top: 1.25rem;
  font-size: 0.875rem;
}

.corp-toc-title {
  font-weight: 600;
  margin-bottom: 0.65rem;
  color: var(--corp-ink);
}

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

.corp-toc .toc-item {
  margin: 0.35rem 0;
}

.corp-toc .toc-item.level-3 {
  padding-left: 0.75rem;
}

.corp-toc .toc-link {
  color: rgba(28, 25, 23, 0.65);
  text-decoration: none;
}

.corp-toc .toc-link:hover {
  color: var(--corp-ink);
}

@media (max-width: 900px) {
  .corp-article-layout {
    grid-template-columns: 1fr;
  }
  .corp-toc {
    position: static;
    order: -1;
  }
}

.corp-article-body h2,
.corp-article-body h3,
.corp-article-body h4 {
  font-family: var(--corp-font-serif);
  color: var(--corp-ink);
  margin-top: 2em;
  margin-bottom: 0.65em;
  line-height: 1.35;
}

.corp-article-body h2 { font-size: 1.375rem; }
.corp-article-body h3 { font-size: 1.125rem; }

.corp-article-body p { margin: 0.85em 0; }

.corp-article-body ul,
.corp-article-body ol {
  margin: 0.75em 0 1.25em;
  padding-left: 1.35em;
}

.corp-article-body li { margin: 0.35em 0; }

.corp-article-body a {
  color: var(--corp-ink);
  border-bottom: 1px solid var(--corp-bronze-soft);
  transition: border-color 0.2s, color 0.2s;
}

.corp-article-body a:hover {
  color: var(--corp-bronze);
  border-bottom-color: var(--corp-bronze);
  text-decoration: none;
}

.corp-article-body blockquote {
  margin: 1.5em 0;
  padding: 0.25em 0 0.25em 1.25em;
  border-left: 2px solid var(--corp-bronze);
  color: var(--corp-text-muted);
  font-style: italic;
}

.corp-article-body code {
  font-size: 0.875em;
  background: rgba(11, 31, 42, 0.06);
  padding: 0.15em 0.4em;
  border-radius: 3px;
}

.corp-article-body pre {
  background: var(--corp-ink);
  color: var(--corp-on-ink);
  padding: 1.125rem 1.25rem;
  overflow-x: auto;
  border-radius: 4px;
  font-size: 0.875rem;
  line-height: 1.55;
}

.corp-article-body pre code {
  background: none;
  padding: 0;
  color: inherit;
}

.corp-article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.25em 0;
  font-size: 0.9375rem;
}

.corp-article-body th,
.corp-article-body td {
  padding: 0.5rem 0.75rem;
  border-bottom: 1px solid var(--corp-bronze-soft);
  text-align: left;
}

.corp-article-body th {
  font-weight: 600;
  color: var(--corp-ink);
}

.corp-article-body img {
  max-width: 100%;
  height: auto;
  border-radius: 2px;
}

/* Center standalone image paragraphs. */
.corp-article-body p:has(> img) {
  text-align: center;
}

/* Side-by-side image groups: total width never exceeds the container. */
.corp-article-body .aipub-img-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin: 1em 0;
}
.corp-article-body .aipub-img-row img {
  flex: 1 1 0;
  min-width: 0;
  max-width: 100%;
  height: auto;
  border-radius: 2px;
}

/* ── Footer ───────────────────────────────────────────────── */

.corp-footer {
  flex: 0 0 auto;
  margin-top: auto;
  padding: 0.875rem 0;
  background: rgba(11, 31, 42, 0.04);
  border-top: 1px solid var(--corp-bronze-soft);
  font-size: 0.75rem;
  color: var(--corp-text-muted);
  text-align: center;
}

.corp-footer p {
  margin: 0;
  max-width: 52rem;
  margin-inline: auto;
  line-height: 1.45;
}

.corp-footer-beian {
  margin-top: 0.35rem !important;
}

.corp-footer-beian a {
  color: inherit;
  text-decoration: none;
}

.corp-footer-beian a:hover {
  text-decoration: underline;
}

/* ── Motion ───────────────────────────────────────────────── */

@keyframes corp-fade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes corp-rise {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  .corp-hero,
  .corp-hero-brand,
  .corp-hero-tagline,
  .corp-kb-nav--hero {
    animation: none;
  }

  .corp-nav-link::after,
  .corp-kb-nav-label::before,
  .corp-kb-nav-menu,
  .corp-link-rows a,
  .corp-link-rows a::after {
    transition: none;
  }
}

/* ── Responsive ───────────────────────────────────────────── */

@media (max-width: 640px) {
  .corp-header-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
  }

  .corp-kb-nav-list {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.25rem;
    width: 100%;
  }

  .corp-kb-nav-item {
    width: 100%;
  }

  .corp-kb-nav-label {
    width: 100%;
    justify-content: space-between;
    cursor: pointer;
  }

  .corp-kb-nav-menu {
    position: static;
    width: 100%;
    box-shadow: none;
    border: none;
    border-left: 2px solid var(--corp-bronze-soft);
    border-radius: 0;
    background: transparent;
    padding: 0 0 0.25rem 0.75rem;
    transform: none;
  }

  .corp-kb-nav-item:not(.is-open) .corp-kb-nav-menu {
    display: none;
  }

  .corp-kb-nav-item:hover .corp-kb-nav-menu,
  .corp-kb-nav-item:focus-within .corp-kb-nav-menu {
    opacity: 0;
    visibility: hidden;
  }

  .corp-kb-nav-item.is-open .corp-kb-nav-menu {
    display: block;
    opacity: 1;
    visibility: visible;
  }

  .corp-kb-nav--hero .corp-kb-nav-list {
    align-items: center;
  }

  .corp-hero {
    padding: 3rem 1.25rem 4rem;
    min-height: min(92vh, 92dvh);
  }

  .corp-portal--page .corp-main {
    padding: 1.75rem 1.25rem 2.5rem;
  }

  .corp-article-meta {
    flex-direction: column;
    gap: 0.35rem;
  }

  .corp-header-feeds {
    display: none;
  }
}