:root {
  --primary-base: #0B1D3A;
  --primary-elevated: #132B4A;
  --accent-gold: #C9A227;
  --accent-orange: #FF6C2C;
  --neutral-light: #F5F0E6;
  --neutral-muted: #A8B8C8;
  --gradient-start: #4FB3D8;
  --gradient-end: #7B5CAD;
  --success: #3DBB6E;
  --warning: #F5B042;
  --font-heading: "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Serif SC", "Songti SC", "SimSun", serif;
  --container-lg: 1280px;
  --container-md: 960px;
  --header-h: 84px;
  --transition-fast: 200ms ease;
  --transition-base: 300ms ease;
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

html[data-scroll-state="scroll"] {
  scroll-behavior: auto;
}

body {
  font-family: var(--font-body);
  background-color: var(--primary-base);
  color: var(--neutral-light);
  line-height: 1.75;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast), border-color var(--transition-fast), background-color var(--transition-fast), box-shadow var(--transition-fast);
}

ul,
ol {
  list-style: none;
}

button,
input,
textarea,
select {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
  background: none;
  border: none;
  cursor: pointer;
}

:focus-visible {
  outline: 2px solid var(--accent-gold);
  outline-offset: 3px;
  border-radius: 2px;
}

::selection {
  background: rgba(201, 162, 39, 0.35);
  color: var(--neutral-light);
}

#main-content {
  flex: 1 0 auto;
  position: relative;
  z-index: 1;
}

.container-lg {
  width: min(var(--container-lg), 100% - 48px);
  margin-inline: auto;
}

.container-md {
  width: min(var(--container-md), 100% - 48px);
  margin-inline: auto;
}

.skip-link {
  position: fixed;
  top: -60px;
  left: 16px;
  z-index: 10000;
  background: var(--accent-gold);
  color: var(--primary-base);
  font-weight: 700;
  padding: 8px 20px;
  border-radius: 0 0 6px 6px;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 0;
}

[data-scroll-progress] {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 100%;
  background: transparent;
  z-index: 9999;
  pointer-events: none;
}

[data-scroll-progress]::before {
  content: "";
  position: absolute;
  inset: 0;
  width: calc(var(--progress, 0) * 100%);
  background: linear-gradient(90deg, var(--gradient-start), var(--accent-gold), var(--accent-orange));
  transform-origin: left;
  transition: width 80ms linear;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(11, 29, 58, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(201, 162, 39, 0.18);
}

.header-frame {
  position: relative;
}

.header-topline {
  height: 4px;
  display: flex;
  overflow: hidden;
  background: var(--primary-base);
}

.header-topline span {
  flex: 1;
  height: 100%;
  transform: skewX(-20deg);
  transform-origin: left;
}

.header-topline span:nth-child(1) {
  background: var(--accent-gold);
  opacity: 0.9;
}

.header-topline span:nth-child(2) {
  background: var(--gradient-start);
  opacity: 0.7;
}

.header-topline span:nth-child(3) {
  background: var(--gradient-end);
  opacity: 0.7;
}

.header-topline span:nth-child(4) {
  background: var(--accent-orange);
  opacity: 0.8;
}

.header-topline span:nth-child(5) {
  background: var(--neutral-muted);
  opacity: 0.35;
}

.header-main {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-h);
  gap: 24px;
  position: relative;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  flex-shrink: 0;
  position: relative;
  z-index: 2;
}

.brand-mark {
  position: relative;
  width: 46px;
  height: 46px;
  flex-shrink: 0;
  display: grid;
  place-items: center;
}

.brand-mark-core {
  width: 18px;
  height: 18px;
  background: var(--accent-gold);
  transform: rotate(45deg);
  position: relative;
  z-index: 2;
  box-shadow: 0 0 18px rgba(201, 162, 39, 0.55);
}

.brand-mark-ring {
  position: absolute;
  inset: 0;
  border: 1px solid rgba(201, 162, 39, 0.5);
  border-radius: 50%;
}

.brand-mark-ring::before {
  content: "";
  position: absolute;
  inset: 8px;
  border: 1px solid rgba(79, 179, 216, 0.55);
  border-radius: 50%;
}

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

.brand-text strong {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--neutral-light);
}

.brand-text em {
  font-style: normal;
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--neutral-muted);
  margin-top: 4px;
}

.header-nav-wrap {
  display: flex;
  align-items: center;
  gap: 28px;
}

.site-nav .nav-list {
  display: flex;
  gap: 2px;
}

.site-nav .nav-list a {
  display: block;
  padding: 8px 14px;
  font-family: var(--font-heading);
  font-weight: 500;
  font-size: 0.94rem;
  color: var(--neutral-muted);
  letter-spacing: 0.04em;
  border-bottom: 2px solid transparent;
  transition: color var(--transition-fast), border-color var(--transition-fast), background-color var(--transition-fast);
}

.site-nav .nav-list a:hover {
  color: var(--neutral-light);
  background: rgba(201, 162, 39, 0.06);
  border-bottom-color: rgba(201, 162, 39, 0.3);
}

.site-nav .nav-list a[aria-current="page"] {
  color: var(--accent-gold);
  border-bottom-color: var(--accent-gold);
  font-weight: 600;
}

.header-action {
  flex-shrink: 0;
}

.btn-gold,
.btn-orange,
.btn-outline {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.92rem;
  letter-spacing: 0.06em;
  padding: 10px 22px;
  border-radius: 2px;
  position: relative;
  overflow: hidden;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast), background-color var(--transition-fast), color var(--transition-fast);
}

.btn-gold {
  border: 1px solid var(--accent-gold);
  color: var(--accent-gold);
  background: linear-gradient(135deg, rgba(201, 162, 39, 0.08), transparent);
}

.btn-gold:hover {
  background: var(--accent-gold);
  color: var(--primary-base);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(201, 162, 39, 0.28);
}

.btn-orange {
  background: var(--accent-orange);
  color: var(--neutral-light);
  border: 1px solid var(--accent-orange);
}

.btn-orange:hover {
  background: #e75a1f;
  border-color: #e75a1f;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(255, 108, 44, 0.3);
}

.btn-outline {
  border: 1px solid rgba(245, 240, 230, 0.35);
  color: var(--neutral-light);
}

.btn-outline:hover {
  border-color: var(--neutral-light);
  background: rgba(245, 240, 230, 0.05);
  transform: translateY(-2px);
}

.nav-toggle {
  display: none;
  position: relative;
  width: 46px;
  height: 46px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  border: 1px solid rgba(201, 162, 39, 0.4);
  border-radius: 2px;
  z-index: 5;
}

.nav-toggle-line {
  width: 20px;
  height: 2px;
  background: var(--accent-gold);
  transition: transform var(--transition-fast), opacity var(--transition-fast), background-color var(--transition-fast);
}

.nav-toggle-label {
  position: absolute;
  bottom: -22px;
  font-size: 0.68rem;
  color: var(--neutral-muted);
  letter-spacing: 0.1em;
  white-space: nowrap;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

[data-nav][data-open] {
  display: block;
}

.site-footer {
  position: relative;
  background: var(--primary-base);
  border-top: 1px solid rgba(201, 162, 39, 0.2);
  margin-top: auto;
  overflow: hidden;
  z-index: 1;
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(100deg, rgba(79, 179, 216, 0.05) 0%, transparent 35%, rgba(123, 92, 173, 0.06) 70%, transparent 100%);
  pointer-events: none;
}

.site-footer::after {
  content: "";
  position: absolute;
  top: 0;
  left: 12%;
  right: 12%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(201, 162, 39, 0.35), transparent);
}

.footer-orbit {
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.18;
}

.orbit-ring {
  position: absolute;
  border: 1px solid var(--gradient-start);
  border-radius: 50%;
}

.orbit-ring-1 {
  width: 680px;
  height: 680px;
  bottom: -520px;
  right: -180px;
}

.orbit-ring-2 {
  width: 480px;
  height: 480px;
  bottom: -380px;
  right: -80px;
  border-color: var(--gradient-end);
}

.orbit-dot {
  position: absolute;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-gold);
  box-shadow: 0 0 16px var(--accent-gold);
}

.orbit-dot-1 {
  bottom: 60px;
  right: 320px;
}

.orbit-dot-2 {
  bottom: 180px;
  right: 60px;
  background: var(--gradient-start);
  box-shadow: 0 0 14px var(--gradient-start);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 0.9fr 0.9fr;
  gap: 48px;
  padding: 64px 0 40px;
  position: relative;
}

.footer-brand .footer-logo {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 12px;
}

.footer-brand .footer-logo strong {
  font-family: var(--font-heading);
  font-size: 1.8rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  color: var(--neutral-light);
}

.footer-brand .footer-logo span {
  font-family: var(--font-heading);
  color: var(--neutral-muted);
  font-size: 0.8rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.footer-desc {
  font-size: 0.9rem;
  color: var(--neutral-muted);
  max-width: 340px;
  margin-bottom: 16px;
  line-height: 1.8;
}

.footer-trust {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: 0.78rem;
  color: var(--accent-gold);
  letter-spacing: 0.12em;
  border: 1px solid rgba(201, 162, 39, 0.3);
  padding: 4px 12px;
  border-radius: 999px;
}

.footer-heading {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.9rem;
  letter-spacing: 0.14em;
  color: var(--neutral-light);
  margin-bottom: 20px;
  position: relative;
  padding-bottom: 10px;
}

.footer-heading::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 28px;
  height: 2px;
  background: var(--accent-gold);
}

.footer-contact-list li,
.footer-links li,
.footer-policy li {
  margin-bottom: 12px;
  font-size: 0.9rem;
  color: var(--neutral-muted);
}

.footer-contact-list li {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.footer-contact-list span {
  font-family: var(--font-heading);
  font-size: 0.74rem;
  color: var(--neutral-muted);
  opacity: 0.7;
  letter-spacing: 0.1em;
}

.footer-contact-list a:hover,
.footer-links a:hover,
.footer-policy a:hover {
  color: var(--accent-gold);
}

.footer-links a,
.footer-policy a {
  position: relative;
  padding-left: 14px;
}

.footer-links a::before,
.footer-policy a::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 6px;
  height: 6px;
  background: var(--accent-gold);
  opacity: 0.5;
  transform: rotate(45deg);
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.footer-links a:hover::before,
.footer-policy a:hover::before {
  opacity: 1;
  transform: rotate(135deg);
}

.footer-note {
  margin-top: 14px;
  font-size: 0.82rem;
  color: var(--neutral-muted);
  opacity: 0.8;
  line-height: 1.7;
  border-left: 2px solid rgba(201, 162, 39, 0.35);
  padding: 6px 0 6px 12px;
}

.footer-bottom {
  position: relative;
  border-top: 1px solid rgba(168, 184, 200, 0.1);
  background: rgba(0, 0, 0, 0.15);
}

.footer-bottom-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 20px 0;
  font-size: 0.82rem;
  color: var(--neutral-muted);
  flex-wrap: wrap;
}

.footer-bottom-inner p {
  font-family: var(--font-heading);
  letter-spacing: 0.06em;
}

.page-hero {
  position: relative;
  padding: clamp(64px, 10vw, 120px) 0 clamp(40px, 6vw, 72px);
  margin-bottom: 40px;
  overflow: hidden;
}

.page-hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  top: 0;
  bottom: 0;
  left: -10%;
  right: -10%;
  background:
    linear-gradient(120deg, rgba(11, 29, 58, 0.5) 0%, rgba(19, 43, 74, 0.2) 50%, transparent 100%),
    radial-gradient(circle at 75% 40%, rgba(79, 179, 216, 0.16), transparent 42%),
    radial-gradient(circle at 30% 15%, rgba(123, 92, 173, 0.14), transparent 45%);
  transform: skewY(-2deg);
}

.page-hero-title {
  font-family: var(--font-heading);
  font-size: clamp(2.4rem, 6vw, 4rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: 0.02em;
  color: var(--neutral-light);
  position: relative;
}

.page-hero-desc {
  margin-top: 18px;
  font-size: clamp(1rem, 1.6vw, 1.15rem);
  color: var(--neutral-muted);
  max-width: 680px;
  line-height: 1.8;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 36px 0 0;
  font-family: var(--font-heading);
  font-size: 0.82rem;
  color: var(--neutral-muted);
  letter-spacing: 0.05em;
}

.breadcrumb a:hover {
  color: var(--accent-gold);
}

.breadcrumb .breadcrumb-sep {
  opacity: 0.5;
}

.breadcrumb [aria-current="page"] {
  color: var(--accent-gold);
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  color: var(--accent-gold);
  text-transform: uppercase;
  margin-bottom: 14px;
}

.section-tag::before {
  content: "";
  width: 24px;
  height: 2px;
  background: var(--accent-gold);
  opacity: 0.6;
}

.section-title {
  font-family: var(--font-heading);
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 800;
  line-height: 1.25;
  color: var(--neutral-light);
  letter-spacing: 0.01em;
}

.section-subtitle {
  font-size: 1rem;
  color: var(--neutral-muted);
  margin-top: 8px;
  line-height: 1.75;
}

.panel {
  background: rgba(19, 43, 74, 0.45);
  border: 1px solid rgba(201, 162, 39, 0.14);
  border-radius: 4px;
  padding: clamp(24px, 4vw, 40px);
  position: relative;
  backdrop-filter: blur(4px);
}

.panel::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 56px;
  background: linear-gradient(180deg, var(--accent-gold), transparent);
}

.img-placeholder {
  position: relative;
  background:
    linear-gradient(135deg, rgba(19, 43, 74, 0.9), rgba(11, 29, 58, 0.95)),
    radial-gradient(circle at 30% 25%, rgba(79, 179, 216, 0.18), transparent 50%),
    radial-gradient(circle at 80% 75%, rgba(123, 92, 173, 0.22), transparent 46%);
  border: 1px solid rgba(201, 162, 39, 0.18);
  border-radius: 4px;
  overflow: hidden;
  min-height: 220px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  z-index: 0;
}

.img-placeholder::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(rgba(201, 162, 39, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(201, 162, 39, 0.05) 1px, transparent 1px);
  background-size: 24px 24px;
  mask-image: radial-gradient(circle at center, black, transparent 75%);
}

.img-placeholder::after {
  content: "图";
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
  font-size: 1.2rem;
  color: rgba(245, 240, 230, 0.25);
  letter-spacing: 0.2em;
  border: 1px solid rgba(201, 162, 39, 0.08);
  border-radius: 4px;
}

.img-placeholder.is-architectural {
  min-height: 300px;
}

.img-placeholder.is-architectural::before {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 32%;
  background: linear-gradient(180deg, transparent, rgba(11, 29, 58, 0.85));
  z-index: 0;
}

.img-placeholder.is-architectural::after {
  content: "地标剪影";
  font-size: 0.85rem;
  align-items: flex-end;
  padding-bottom: 32px;
  color: rgba(245, 240, 230, 0.35);
}

.img-placeholder.is-dataflow {
  min-height: 260px;
}

.img-placeholder.is-dataflow::after {
  content: "数据流";
  font-size: 0.85rem;
  color: rgba(79, 179, 216, 0.55);
}

.img-placeholder.is-pattern {
  min-height: 200px;
}

.img-placeholder.is-pattern::after {
  content: "纹样";
  font-size: 0.85rem;
  color: rgba(201, 162, 39, 0.45);
}

.pagination {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  justify-content: center;
  margin-top: 40px;
}

.pagination a,
.pagination .pagination-current {
  display: inline-grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border: 1px solid rgba(201, 162, 39, 0.25);
  border-radius: 2px;
  font-family: var(--font-heading);
  font-size: 0.9rem;
  color: var(--neutral-muted);
  transition: all var(--transition-fast);
}

.pagination a:hover {
  border-color: var(--accent-gold);
  color: var(--accent-gold);
  background: rgba(201, 162, 39, 0.08);
}

.pagination .is-current,
.pagination .pagination-current {
  background: var(--accent-gold);
  border-color: var(--accent-gold);
  color: var(--primary-base);
  font-weight: 700;
}

.pagination .page-prev,
.pagination .page-next {
  width: auto;
  padding: 0 14px;
}

[data-reveal] {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.6s var(--ease-out), transform 0.6s var(--ease-out);
  will-change: opacity, transform;
}

[data-reveal="left"] {
  transform: translateX(-30px);
}

[data-reveal="right"] {
  transform: translateX(30px);
}

[data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

[data-theme-filter] {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 28px;
}

[data-theme-filter] button {
  font-family: var(--font-heading);
  font-size: 0.9rem;
  color: var(--neutral-muted);
  border: 1px solid rgba(168, 184, 200, 0.25);
  padding: 8px 18px;
  border-radius: 999px;
  transition: all var(--transition-fast);
  letter-spacing: 0.04em;
}

[data-theme-filter] button:hover {
  border-color: var(--accent-gold);
  color: var(--accent-gold);
}

[data-theme-filter] button.is-active {
  background: var(--accent-gold);
  border-color: var(--accent-gold);
  color: var(--primary-base);
  font-weight: 600;
}

.filterable {
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.filterable.is-filtered {
  opacity: 0.35;
  transform: scale(0.97);
  pointer-events: none;
}

@media (max-width: 1024px) {
  .header-nav-wrap {
    gap: 16px;
  }

  .site-nav .nav-list a {
    padding: 8px 10px;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 36px;
  }
}

@media (max-width: 860px) {
  :root {
    --header-h: 68px;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .header-main {
    flex-wrap: wrap;
    padding: 8px 0;
  }

  .header-nav-wrap {
    display: none;
    width: 100%;
    flex-direction: column;
    align-items: stretch;
    gap: 12px;
    padding: 16px 0 20px;
    border-top: 1px solid rgba(201, 162, 39, 0.15);
    margin-top: 4px;
  }

  .header-nav-wrap[data-open] {
    display: flex;
  }

  .site-nav .nav-list {
    flex-direction: column;
    gap: 0;
  }

  .site-nav .nav-list a {
    padding: 12px 6px;
    font-size: 1rem;
    border-bottom: 1px solid rgba(168, 184, 200, 0.1);
    border-left: 3px solid transparent;
  }

  .site-nav .nav-list a[aria-current="page"] {
    border-left-color: var(--accent-gold);
  }

  .header-action {
    align-self: flex-start;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
    padding-top: 48px;
  }

  .footer-bottom-inner {
    flex-direction: column;
    text-align: center;
  }

  .brand-mark {
    width: 38px;
    height: 38px;
  }

  .brand-text strong {
    font-size: 1.25rem;
  }
}

@media (max-width: 520px) {
  .container-lg,
  .container-md {
    width: calc(100% - 32px);
  }

  .brand-text em {
    font-size: 0.62rem;
  }

  .footer-contact-list li {
    flex-direction: column;
  }

  .page-hero {
    padding-top: 48px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  [data-reveal] {
    opacity: 1;
    transform: none;
  }
}