:root {
  --color-primary-deep-blue: #0A2540;
  --color-primary-gold: #B88A44;
  --color-page-bg: #F5F7FA;
  --color-card-bg: #FFFFFF;
  --color-text-primary: #1C1E21;
  --color-text-secondary: #6B7280;
  --color-line-border: #D1D5DB;
  --color-accent-deep-gold: #8A6D3B;
  --color-accent-teal: #1F4E5F;
  --color-state-ok: #2E7D32;
  --font-heading: "Noto Serif SC", Georgia, serif;
  --font-body: "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", SFMono-Regular, Consolas, monospace;
  --header-width: 280px;
  --content-max-width: 1440px;
  --page-padding: 32px;
  --spacing-xs: 8px;
  --spacing-sm: 16px;
  --spacing-md: 32px;
  --spacing-lg: 64px;
  --spacing-xl: 96px;
  --transition-fast: 180ms ease;
  --transition-slow: 320ms ease;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  background-color: var(--color-page-bg);
  color: var(--color-text-primary);
  font-family: var(--font-body);
  line-height: 1.7;
  min-height: 100vh;
}

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

ul,
ol {
  list-style: none;
}

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

button {
  background: none;
  border: none;
  font-family: inherit;
  cursor: pointer;
}

:focus-visible {
  outline: 2px solid var(--color-primary-gold);
  outline-offset: 4px;
  border-radius: 2px;
}

.skip-link {
  position: fixed;
  top: 16px;
  left: 16px;
  z-index: 2000;
  background: var(--color-primary-deep-blue);
  color: #ffffff;
  padding: 8px 16px;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  border: 1px solid var(--color-primary-gold);
  transform: translateY(-180%);
  transition: transform var(--transition-slow);
}

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

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--header-width);
  background: var(--color-primary-deep-blue);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  border-right: 1px solid rgba(184, 138, 68, 0.5);
}

.site-header__bar {
  padding: var(--spacing-md) var(--spacing-md) 0;
  display: flex;
  flex-direction: column;
  align-items: stretch;
}

.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  color: #ffffff;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.5rem;
  letter-spacing: 0.02em;
}

.site-brand__mark {
  position: relative;
  width: 36px;
  height: 36px;
  display: inline-block;
  flex-shrink: 0;
}

.site-brand__triangle {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 0;
  height: 0;
  border-left: 20px solid transparent;
  border-right: 20px solid transparent;
  border-bottom: 30px solid var(--color-primary-gold);
}

.site-brand__line {
  position: absolute;
  top: 6px;
  left: 18px;
  width: 2px;
  height: 34px;
  background: #ffffff;
}

.site-brand__line::after {
  content: "";
  position: absolute;
  right: -8px;
  top: 4px;
  width: 16px;
  height: 2px;
  background: #ffffff;
}

.site-header__meta {
  margin-top: var(--spacing-md);
  padding-top: var(--spacing-sm);
  border-top: 1px solid rgba(184, 138, 68, 0.4);
}

.site-version {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-primary-gold);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.site-version::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-state-ok);
  box-shadow: 0 0 6px rgba(46, 125, 50, 0.6);
}

.site-nav-wrap {
  flex: 1;
  display: flex;
  padding: var(--spacing-md) var(--spacing-md);
  overflow-y: auto;
}

.site-nav {
  width: 100%;
}

.site-nav__list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.site-nav__item {
  border-left: 2px solid transparent;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.site-nav__item:hover {
  border-left-color: var(--color-primary-gold);
  background: rgba(184, 138, 68, 0.08);
}

.site-nav__link {
  display: block;
  padding: 12px 16px;
  color: #d6dee8;
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  transition: color var(--transition-fast);
}

.site-nav__link:hover {
  color: #ffffff;
}

.site-nav__link[aria-current="page"] {
  color: #ffffff;
  font-weight: 700;
  border-left: 3px solid var(--color-primary-gold);
  margin-left: -3px;
  background: linear-gradient(90deg, rgba(184, 138, 68, 0.12), transparent);
}

.nav-toggle {
  display: none;
}

.nav-toggle__line {
  display: block;
  width: 22px;
  height: 2px;
  background: #ffffff;
  margin-bottom: 5px;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.nav-toggle__line:last-of-type {
  margin-bottom: 0;
}

.nav-toggle__label {
  display: none;
}

main#main-content {
  margin-left: var(--header-width);
  min-height: 70vh;
}

.site-footer {
  margin-left: var(--header-width);
  background: var(--color-primary-deep-blue);
  color: #d6dee8;
  border-top: 1px solid rgba(184, 138, 68, 0.5);
}

.site-footer__inner {
  max-width: calc(var(--content-max-width) - var(--header-width));
  margin: 0 auto;
  padding: var(--spacing-lg) var(--page-padding) var(--spacing-md);
  display: grid;
  grid-template-columns: 1.2fr 1fr 0.6fr;
  gap: var(--spacing-lg);
}

.site-footer__brand {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.site-footer__logo {
  display: block;
  width: 48px;
  height: 48px;
  border: 2px solid var(--color-primary-gold);
  clip-path: polygon(50% 0%, 100% 100%, 0% 100%);
  opacity: 0.9;
}

.site-footer__name {
  font-family: var(--font-heading);
  font-size: 1.375rem;
  font-weight: 700;
  color: #ffffff;
  letter-spacing: 0.02em;
}

.site-footer__note {
  font-size: 0.875rem;
  line-height: 1.6;
  color: var(--color-text-secondary);
  max-width: 28ch;
}

.site-footer__heading {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-primary-gold);
  margin-bottom: var(--spacing-sm);
  padding-bottom: var(--spacing-xs);
  border-bottom: 1px solid rgba(184, 138, 68, 0.3);
}

.site-footer__contact-list,
.site-footer__legal-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.site-footer__contact-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.site-footer__label {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.site-footer__link,
.site-footer__text {
  color: #d6dee8;
  font-size: 0.875rem;
  transition: color var(--transition-fast);
}

.site-footer__link:hover {
  color: var(--color-primary-gold);
}

.site-footer__bottom {
  max-width: calc(var(--content-max-width) - var(--header-width));
  margin: 0 auto;
  padding: var(--spacing-md) var(--page-padding);
  display: flex;
  justify-content: space-between;
  gap: var(--spacing-sm);
  border-top: 1px solid rgba(184, 138, 68, 0.2);
}

.site-footer__copyright,
.site-footer__icp {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-text-secondary);
}

.scroll-progress {
  position: fixed;
  top: 0;
  right: 0;
  height: 3px;
  background: var(--color-primary-gold);
  z-index: 1500;
  width: 100%;
  transform-origin: 0 50%;
  transform: scaleX(0);
  pointer-events: none;
}

.page-container {
  max-width: calc(var(--content-max-width) - var(--header-width) - var(--page-padding) * 2);
  margin: 0 auto;
  padding: var(--spacing-lg) var(--page-padding) var(--spacing-xl);
}

.section-index {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-accent-deep-gold);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  display: block;
  margin-bottom: var(--spacing-sm);
}

.page-title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 4vw, 3.5rem);
  font-weight: 700;
  line-height: 1.15;
  color: var(--color-primary-deep-blue);
  letter-spacing: -0.01em;
  max-width: 18ch;
}

.page-lead {
  font-size: 1.0625rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-top: var(--spacing-sm);
  max-width: 60ch;
}

.section-divider {
  border: none;
  border-top: 1px solid var(--color-line-border);
  margin: var(--spacing-lg) 0;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
}

.card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-line-border);
  border-top: 3px solid var(--color-primary-gold);
  padding: var(--spacing-md);
  transition: box-shadow var(--transition-fast), transform var(--transition-fast);
}

.card:hover {
  box-shadow: 0 12px 32px rgba(10, 37, 64, 0.08);
  transform: translateY(-2px);
}

.card__meta {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--color-primary-gold);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.card__title {
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-primary-deep-blue);
  margin-top: var(--spacing-xs);
}

.card__text {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin-top: 8px;
  line-height: 1.6;
}

.image-frame {
  position: relative;
  background: linear-gradient(135deg, #0A2540 0%, #1F4E5F 100%);
  border: 1px solid var(--color-line-border);
  overflow: hidden;
  min-height: 240px;
}

.image-frame::before {
  content: "";
  display: block;
  padding-top: 62.5%;
}

.image-frame__placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.image-frame__placeholder::before {
  content: "";
  width: 80px;
  height: 80px;
  border: 2px solid var(--color-primary-gold);
  border-top-color: transparent;
  border-radius: 50%;
  opacity: 0.4;
}

.image-frame__placeholder::after {
  content: "";
  position: absolute;
  width: 120px;
  height: 60px;
  background: rgba(184, 138, 68, 0.12);
  transform: skewX(-30deg);
}

.cta-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary-deep-blue);
  color: #ffffff;
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 600;
  padding: 12px 28px;
  border: 1px solid var(--color-primary-deep-blue);
  transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}

.cta-button:hover {
  background: var(--color-primary-gold);
  border-color: var(--color-primary-gold);
}

.cta-button--outline {
  background: transparent;
  color: var(--color-primary-deep-blue);
  border-color: var(--color-primary-gold);
}

.cta-button--outline:hover {
  background: var(--color-primary-gold);
  color: #ffffff;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-md);
}

.breadcrumb a {
  color: var(--color-primary-deep-blue);
  transition: color var(--transition-fast);
}

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

.breadcrumb__sep {
  color: var(--color-line-border);
}

.status-panel {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  border: 1px solid var(--color-line-border);
  background: var(--color-card-bg);
  padding: 12px 20px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
}

.status-panel__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-state-ok);
}

.status-panel__dot[data-status="archived"] {
  background: var(--color-primary-deep-blue);
}

.status-panel__dot[data-status="maintenance"] {
  background: var(--color-primary-gold);
}

[data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-reveal][data-revealed] {
  opacity: 1;
  transform: translateY(0);
}

.section-highlight {
  scroll-margin-top: 32px;
}

@media (max-width: 1120px) {
  :root {
    --header-width: 240px;
  }

  .site-footer__inner {
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
  }

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

@media (max-width: 860px) {
  :root {
    --header-width: 0px;
  }

  body {
    padding-top: 0;
  }

  .site-header {
    position: sticky;
    width: 100%;
    height: auto;
    flex-direction: row;
    align-items: center;
    border-right: none;
    border-bottom: 1px solid rgba(184, 138, 68, 0.5);
  }

  .site-header__bar {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    padding: 14px 20px;
    width: 100%;
  }

  .site-brand {
    font-size: 1.25rem;
  }

  .site-header__meta {
    margin-top: 0;
    padding-top: 0;
    border-top: none;
    margin-left: auto;
    margin-right: 16px;
    display: none;
  }

  .nav-toggle {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    gap: 5px;
    padding: 8px;
    color: #ffffff;
    font-size: 0.6875rem;
  }

  .nav-toggle__label {
    display: inline-block;
    font-size: 0.625rem;
    color: var(--color-primary-gold);
    font-family: var(--font-mono);
    text-transform: uppercase;
    letter-spacing: 0.08em;
  }

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

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

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

  .site-nav-wrap {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: min(320px, 82vw);
    background: var(--color-primary-deep-blue);
    padding: 80px 28px 32px;
    z-index: -1;
    box-shadow: -12px 0 32px rgba(10, 37, 64, 0.18);
    transform: translateX(100%);
    transition: transform var(--transition-slow);
    border-left: 1px solid rgba(184, 138, 68, 0.4);
  }

  .site-nav-wrap[data-open] {
    transform: translateX(0);
  }

  .site-nav__list {
    gap: 8px;
  }

  .site-nav__link {
    font-size: 1rem;
    padding: 14px 16px;
  }

  main#main-content,
  .site-footer {
    margin-left: 0;
  }

  .site-footer__inner {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
    padding-top: var(--spacing-md);
  }

  .site-footer__bottom {
    flex-direction: column;
    gap: 8px;
  }

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

  .page-container {
    padding: var(--spacing-md) 20px var(--spacing-lg);
  }
}

@media (min-width: 861px) {
  .nav-toggle {
    display: none;
  }

  .site-nav-wrap {
    flex: 1;
  }
}

@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;
  }

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