:root {
  --color-primary: #0B3D2E;
  --color-primary-light: #16644C;
  --color-primary-dark: #06241C;
  --color-accent: #C9A227;
  --color-amber: #E0A800;
  --color-secondary: #8B1E3F;
  --color-white: #FFFFFF;
  --color-cream: #F5F0E6;
  --color-ink: #1A1A1A;
  --color-sage: #7A8B7A;
  --color-soft-black: #111111;
  --font-heading: "Arial Black", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Helvetica Neue", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "Courier New", "Roboto Mono", monospace;
  --container-w: 1280px;
  --header-h: 76px;
  --space-section: 96px;
  --radius: 4px;
  --shadow-card: 0 2px 12px rgba(6, 36, 28, 0.08);
  --shadow-card-hover: 0 14px 32px rgba(6, 36, 28, 0.16);
}

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

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

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.8;
  color: var(--color-ink);
  background-color: var(--color-cream);
  background-image:
    linear-gradient(rgba(11, 61, 46, 0.028) 1px, transparent 1px),
    linear-gradient(90deg, rgba(11, 61, 46, 0.028) 1px, transparent 1px);
  background-size: 42px 42px;
  min-height: 100vh;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 900;
  line-height: 1.3;
  color: var(--color-ink);
  text-wrap: balance;
}

h1 {
  font-size: 2.65rem;
}

h2 {
  font-size: 2.1rem;
}

h3 {
  font-size: 1.5rem;
}

h4 {
  font-size: 1.18rem;
}

p {
  text-wrap: pretty;
}

ul, ol {
  list-style: none;
}

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

a:hover {
  color: var(--color-secondary);
}

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

button {
  font: inherit;
  border: none;
  background: none;
  padding: 0;
  cursor: pointer;
}

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

::selection {
  background: var(--color-accent);
  color: var(--color-primary-dark);
}

.visually-hidden {
  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;
  top: -72px;
  left: 16px;
  z-index: 1000;
  padding: 10px 18px;
  background: var(--color-accent);
  color: var(--color-primary-dark);
  font-weight: 700;
  font-size: 0.9rem;
  border-radius: 0 0 var(--radius) var(--radius);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.28);
  transition: top 0.2s ease;
}

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

.container {
  width: 100%;
  max-width: var(--container-w);
  margin-inline: auto;
  padding-inline: 24px;
}

.page-content {
  padding-block: 72px;
  min-height: 60vh;
}

#main-content {
  scroll-margin-top: calc(var(--header-h) + 8px);
}

.section {
  padding-block: var(--space-section);
}

.section-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 34px;
}

.section-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.75rem;
  letter-spacing: 0.02em;
}

.section-title::before {
  content: "";
  flex-shrink: 0;
  width: 8px;
  height: 26px;
  background: linear-gradient(180deg, var(--color-accent), var(--color-secondary));
  clip-path: polygon(0 0, 100% 14%, 100% 86%, 0 100%);
}

.section-index {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 400;
  color: var(--color-sage);
  margin-top: 6px;
}

.section-more {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-primary);
  border-bottom: 1px solid var(--color-accent);
  padding-bottom: 3px;
  white-space: nowrap;
}

.section-more:hover {
  color: var(--color-secondary);
  border-bottom-color: var(--color-secondary);
}

.section-more::after {
  content: " →";
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-primary);
  border-bottom: 1px solid rgba(201, 162, 39, 0.35);
  transition: background-color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.site-header.is-overlay {
  background: linear-gradient(180deg, rgba(6, 36, 28, 0.78), rgba(11, 61, 46, 0.44));
  border-bottom-color: transparent;
}

.site-header.is-overlay.is-solid {
  background: var(--color-primary);
  border-bottom-color: rgba(201, 162, 39, 0.35);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.25);
}

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

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.brand-mark {
  position: relative;
  width: 32px;
  height: 32px;
  flex-shrink: 0;
  border-radius: 50%;
  border: 2px solid var(--color-accent);
  background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary-dark));
  overflow: hidden;
}

.brand-mark::before {
  content: "";
  position: absolute;
  left: -20%;
  right: -20%;
  top: 40%;
  height: 2px;
  background: var(--color-accent);
  transform: rotate(-45deg);
}

.brand-mark::after {
  content: "";
  position: absolute;
  inset: 5px;
  border: 1px dashed rgba(245, 240, 230, 0.4);
  border-radius: 50%;
}

.brand-name {
  font-family: var(--font-heading);
  font-size: 1.24rem;
  font-weight: 900;
  letter-spacing: 0.03em;
  color: var(--color-white);
  line-height: 1.2;
  white-space: nowrap;
}

.brand-name-accent {
  color: var(--color-accent);
}

.brand-tagline {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: rgba(201, 162, 39, 0.9);
  border-left: 1px solid rgba(255, 255, 255, 0.18);
  padding-left: 10px;
  white-space: nowrap;
}

.site-nav {
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 14px;
  font-size: 0.94rem;
  font-weight: 600;
  color: var(--color-cream);
  border: 1px solid transparent;
  border-radius: 3px;
  transition: color var(--transition-fast), background-color var(--transition-fast), border-color var(--transition-fast);
}

.nav-link:hover {
  color: var(--color-amber);
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(201, 162, 39, 0.3);
}

.nav-index {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  line-height: 1;
  color: var(--color-accent);
}

.nav-link[aria-current="page"] {
  color: var(--color-primary-dark);
  background: linear-gradient(120deg, var(--color-accent), var(--color-amber));
  border-color: var(--color-accent);
}

.nav-link[aria-current="page"]:hover {
  color: var(--color-primary-dark);
  background: var(--color-amber);
}

.nav-link[aria-current="page"] .nav-index {
  color: rgba(6, 36, 28, 0.6);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  min-width: 48px;
  min-height: 48px;
  padding: 8px 12px;
  border: 1px solid rgba(201, 162, 39, 0.38);
  border-radius: 3px;
  background: rgba(255, 255, 255, 0.04);
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.nav-toggle:hover {
  border-color: var(--color-accent);
  background: rgba(201, 162, 39, 0.1);
}

.nav-toggle-bars {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
}

.nav-toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-cream);
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.nav-toggle-label {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  line-height: 1;
  letter-spacing: 0.24em;
  color: var(--color-accent);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

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

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 200;
  width: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-amber));
  pointer-events: none;
}

.back-to-top {
  position: fixed;
  right: 22px;
  bottom: 22px;
  z-index: 90;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  border: 1px solid var(--color-accent);
  border-radius: 3px;
  background: var(--color-primary);
  color: var(--color-accent);
  font-size: 1.35rem;
  line-height: 1;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.26);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s, background-color 0.2s ease, color 0.2s ease;
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--color-accent);
  color: var(--color-primary-dark);
}

.site-footer {
  position: relative;
  margin-top: var(--space-section);
  color: rgba(245, 240, 230, 0.78);
  background:
    radial-gradient(ellipse at 12% 100%, rgba(201, 162, 39, 0.1) 0%, transparent 55%),
    linear-gradient(160deg, var(--color-primary) 0%, var(--color-primary-dark) 68%, var(--color-soft-black) 100%);
}

.footer-ribbon {
  height: 4px;
  background: linear-gradient(90deg, var(--color-accent) 0%, var(--color-amber) 72%, var(--color-secondary) 72%, var(--color-secondary) 100%);
}

.footer-inner {
  padding-top: 56px;
  padding-bottom: 26px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.35fr;
  gap: 40px 48px;
}

.footer-col {
  min-width: 0;
}

.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.footer-mark {
  position: relative;
  width: 30px;
  height: 30px;
  flex-shrink: 0;
  border-radius: 50%;
  border: 2px solid var(--color-accent);
  background: var(--color-primary-dark);
}

.footer-mark::after {
  content: "";
  position: absolute;
  inset: 5px;
  border: 1px dashed rgba(201, 162, 39, 0.55);
  border-radius: 50%;
}

.footer-brand-name {
  font-family: var(--font-heading);
  font-size: 1.18rem;
  font-weight: 900;
  letter-spacing: 0.04em;
  color: var(--color-white);
}

.footer-desc {
  margin-top: 16px;
  max-width: 38ch;
  font-size: 0.92rem;
  line-height: 1.9;
  color: rgba(245, 240, 230, 0.66);
}

.footer-heading {
  position: relative;
  font-size: 0.94rem;
  font-weight: 900;
  letter-spacing: 0.14em;
  color: var(--color-white);
  margin-bottom: 18px;
  padding-left: 12px;
}

.footer-heading::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  width: 4px;
  height: 13px;
  background: linear-gradient(180deg, var(--color-accent), var(--color-secondary));
  clip-path: polygon(0 0, 100% 18%, 100% 82%, 0 100%);
}

.footer-link-list li + li {
  margin-top: 10px;
}

.footer-link-list a {
  color: rgba(245, 240, 230, 0.78);
  font-size: 0.92rem;
  transition: color var(--transition-fast), padding-left var(--transition-fast);
}

.footer-link-list a:hover {
  color: var(--color-amber);
  padding-left: 3px;
}

.footer-contact-list li {
  position: relative;
  padding-left: 16px;
  font-size: 0.92rem;
  line-height: 1.8;
  color: rgba(245, 240, 230, 0.78);
  word-break: break-word;
}

.footer-contact-list li::before {
  content: "▸";
  position: absolute;
  left: 0;
  top: 0;
  color: var(--color-accent);
}

.footer-label {
  display: inline-block;
  min-width: 3em;
  margin-right: 6px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-accent);
}

.footer-rule {
  height: 1px;
  margin-top: 42px;
  background: linear-gradient(90deg, rgba(201, 162, 39, 0.55) 0%, rgba(255, 255, 255, 0.08) 42%, transparent 72%);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  padding-top: 20px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: rgba(245, 240, 230, 0.52);
}

.footer-status {
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  color: rgba(201, 162, 39, 0.85);
  border: 1px solid rgba(201, 162, 39, 0.24);
  padding: 5px 12px;
  border-radius: 2px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 26px;
  font-weight: 700;
  font-size: 0.95rem;
  line-height: 1.2;
  border-radius: 3px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform var(--transition-fast), background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}

.btn-primary {
  position: relative;
  overflow: hidden;
  background: linear-gradient(120deg, var(--color-accent), var(--color-amber));
  color: var(--color-primary-dark);
}

.btn-primary::after {
  content: "";
  position: absolute;
  top: 0;
  left: -60%;
  width: 40%;
  height: 100%;
  background: linear-gradient(100deg, transparent, rgba(255, 255, 255, 0.42), transparent);
  transform: skewX(-20deg);
  transition: left 0.35s ease;
}

.btn-primary:hover {
  background: var(--color-amber);
  color: var(--color-primary-dark);
  transform: translateY(-2px);
}

.btn-primary:hover::after {
  left: 130%;
}

.btn-outline {
  border-color: var(--color-accent);
  color: var(--color-primary);
  background: transparent;
}

.btn-outline:hover {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-amber);
  transform: translateY(-2px);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}

.card {
  padding: 26px;
  background: var(--color-white);
  border: 1px solid rgba(26, 26, 26, 0.1);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
  border-color: rgba(201, 162, 39, 0.55);
}

.card-title {
  font-family: var(--font-heading);
  font-size: 1.08rem;
  font-weight: 900;
  color: var(--color-ink);
  margin-bottom: 6px;
}

.card-meta {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--color-sage);
}

.card-text {
  margin-top: 10px;
  font-size: 0.92rem;
  line-height: 1.85;
  color: rgba(26, 26, 26, 0.82);
}

.tag {
  display: inline-block;
  padding: 3px 10px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  border-radius: 2px;
  background: var(--color-secondary);
  color: var(--color-white);
}

.tag-green {
  background: var(--color-primary);
  color: var(--color-accent);
}

.tag-gold {
  background: var(--color-accent);
  color: var(--color-primary-dark);
}

.data-number {
  font-family: var(--font-mono);
  font-size: 2.4rem;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--color-primary);
}

.data-number .unit {
  font-size: 1rem;
  font-weight: 400;
  letter-spacing: 0;
  color: var(--color-sage);
  margin-left: 4px;
}

.breadcrumbs {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--color-sage);
  margin-bottom: 28px;
}

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
}

.breadcrumb-item {
  display: inline-flex;
  align-items: center;
  color: var(--color-sage);
}

.breadcrumb-item + .breadcrumb-item {
  margin-left: 8px;
}

.breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  margin-right: 8px;
  color: var(--color-accent);
}

.breadcrumb-item a {
  color: var(--color-primary);
}

.breadcrumb-item a:hover {
  color: var(--color-secondary);
}

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

.prose {
  max-width: 72ch;
}

.prose p {
  margin-bottom: 1.2em;
}

.prose h2 {
  margin-top: 1.5em;
  margin-bottom: 0.5em;
}

.prose h3 {
  margin-top: 1.3em;
  margin-bottom: 0.4em;
}

.prose ul {
  list-style: disc;
  padding-left: 1.4em;
  margin-bottom: 1.2em;
}

.prose li {
  margin-bottom: 0.4em;
}

.image-placeholder {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background:
    linear-gradient(150deg, transparent 0%, rgba(201, 162, 39, 0.12) 44%, rgba(139, 30, 63, 0.2) 56%, transparent 100%),
    radial-gradient(ellipse at 72% 30%, var(--color-primary-light) 0%, var(--color-primary) 58%, var(--color-primary-dark) 100%);
  border-radius: var(--radius);
}

.image-placeholder::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.07) 1px, transparent 1px);
  background-size: 30px 30px;
}

.image-placeholder::after {
  content: "";
  position: absolute;
  top: 0;
  left: -35%;
  width: 45%;
  height: 100%;
  background: linear-gradient(105deg, transparent 0%, rgba(255, 255, 255, 0.18) 50%, transparent 100%);
  transform: skewX(-18deg);
  transition: left 0.5s ease;
}

.image-placeholder:hover::after {
  left: 130%;
}

.aspect-4-3 {
  aspect-ratio: 4 / 3;
}

.aspect-3-4 {
  aspect-ratio: 3 / 4;
}

@media (max-width: 960px) {
  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: block;
    background: var(--color-primary);
    border-bottom: 1px solid rgba(201, 162, 39, 0.35);
    box-shadow: 0 20px 34px rgba(0, 0, 0, 0.24);
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    visibility: hidden;
    transition: max-height 0.32s ease, opacity 0.26s ease, visibility 0.26s;
  }

  .site-nav[data-open] {
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
    opacity: 1;
    visibility: visible;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 10px 20px 24px;
  }

  .nav-item {
    border-bottom: 1px dashed rgba(255, 255, 255, 0.08);
  }

  .nav-link {
    width: 100%;
    justify-content: flex-start;
    padding: 14px 8px;
    font-size: 1rem;
    border-radius: 0;
  }

  .nav-link[aria-current="page"] {
    border-radius: 3px;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 36px 28px;
  }

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

@media (max-width: 640px) {
  :root {
    --space-section: 56px;
    --header-h: 64px;
  }

  .container {
    padding-inline: 18px;
  }

  .page-content {
    padding-block: 48px;
  }

  .brand-name {
    font-size: 1.06rem;
  }

  .brand-tagline {
    display: none;
  }

  .footer-inner {
    padding-top: 44px;
  }

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

  .footer-col-brand {
    grid-column: auto;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }

  h1 {
    font-size: 2.1rem;
  }

  h2 {
    font-size: 1.7rem;
  }

  h3 {
    font-size: 1.3rem;
  }

  .section-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }

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

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    transition-delay: 0ms !important;
  }

  .image-placeholder::after,
  .btn-primary::after {
    display: none;
  }
}