:root {
  --color-primary-dark: #0B1D3A;
  --color-accent-gold: #F0C040;
  --color-accent-green: #00FF88;
  --color-surface-light: #1A2F4A;
  --color-text-primary: #FFFFFF;
  --color-text-secondary: #B0C4DE;
  --color-border-subtle: #2E4A6A;
  --color-hover-glow: rgba(240, 192, 64, 0.3);
  --font-heading: 'Impact', 'Arial Black', 'Heiti SC', 'Microsoft YaHei', sans-serif;
  --font-body: -apple-system, 'Helvetica Neue', 'Heiti SC', 'Microsoft YaHei', sans-serif;
  --header-height: 80px;
  --header-height-mobile: 60px;
  --container-max: 1280px;
  --transition-base: 0.25s ease;
  --border-radius-sharp: 2px;
}

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

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

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text-primary);
  background-color: var(--color-primary-dark);
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--color-accent-gold);
  text-decoration: none;
  transition: color var(--transition-base);
}

a:hover {
  color: var(--color-accent-green);
}

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

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

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0.02em;
}

h1 {
  font-size: 3.5rem;
  text-shadow: 0 0 10px var(--color-accent-gold);
}

h2 {
  font-size: 2.5rem;
}

h3 {
  font-size: 1.75rem;
}

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

.skip-link {
  position: absolute;
  top: -1000px;
  left: 1rem;
  z-index: 9999;
  background: var(--color-accent-gold);
  color: var(--color-primary-dark);
  padding: 0.5rem 1rem;
  font-weight: 700;
  border-radius: var(--border-radius-sharp);
}

.skip-link:focus {
  top: 0.5rem;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
  background: transparent;
  transition: background var(--transition-base), box-shadow var(--transition-base);
}

.site-header.scrolled {
  background: var(--color-primary-dark);
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.6), 0 1px 0 var(--color-border-subtle);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.header-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-heading);
  font-size: 1.5rem;
  color: var(--color-text-primary);
  text-shadow: 0 0 8px var(--color-accent-gold);
  z-index: 1001;
}

.header-logo:hover {
  color: var(--color-accent-gold);
}

.header-logo-icon {
  flex-shrink: 0;
}

.header-logo-text {
  letter-spacing: 0.08em;
}

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

.header-nav-list {
  display: flex;
  gap: 0.25rem;
}

.header-nav-link {
  display: block;
  padding: 0.5rem 1rem;
  font-family: var(--font-heading);
  font-size: 1.05rem;
  letter-spacing: 0.06em;
  color: var(--color-text-secondary);
  border-radius: var(--border-radius-sharp);
  transition: color var(--transition-base), background var(--transition-base), box-shadow var(--transition-base);
}

.header-nav-link:hover {
  color: var(--color-accent-gold);
  background: var(--color-hover-glow);
}

.header-nav-link:focus-visible {
  box-shadow: 0 0 0 2px var(--color-accent-gold);
}

.header-nav-link[aria-current="page"] {
  color: var(--color-accent-gold);
  text-shadow: 0 0 6px var(--color-accent-gold);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  z-index: 1001;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem 1.25rem;
  font-family: var(--font-heading);
  font-size: 0.95rem;
  letter-spacing: 0.04em;
  border-radius: var(--border-radius-sharp);
  cursor: pointer;
  transition: all var(--transition-base);
  border: 1.5px solid transparent;
  text-shadow: none;
}

.btn:focus-visible {
  outline: 2px solid var(--color-accent-green);
  outline-offset: 2px;
}

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

.btn-primary:hover {
  background: transparent;
  color: var(--color-accent-gold);
  box-shadow: 0 0 12px var(--color-hover-glow);
}

.btn-secondary {
  background: transparent;
  color: var(--color-accent-gold);
  border-color: var(--color-accent-gold);
}

.btn-secondary:hover {
  background: var(--color-accent-gold);
  color: var(--color-primary-dark);
  box-shadow: 0 0 12px var(--color-hover-glow);
}

.header-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 6px;
  border-radius: var(--border-radius-sharp);
}

.header-toggle:focus-visible {
  outline: 2px solid var(--color-accent-gold);
}

.toggle-bar {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-text-primary);
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 1002;
  width: 0%;
  height: 3px;
  background: var(--color-accent-green);
  transition: width 0.1s linear;
  pointer-events: none;
}

@media (max-width: 48em) {
  .site-header {
    height: var(--header-height-mobile);
  }

  .header-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 999;
    background: var(--color-primary-dark);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
  }

  .header-nav[data-open] {
    opacity: 1;
    pointer-events: all;
  }

  .header-nav-list {
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
  }

  .header-nav-link {
    font-size: 1.5rem;
    padding: 0.75rem 2rem;
  }

  .header-actions .btn {
    display: none;
  }

  .header-toggle {
    display: flex;
  }

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

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

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

  .header-logo-text {
    font-size: 1.2rem;
  }
}

@media (min-width: 48.01em) and (max-width: 64em) {
  .header-nav-link {
    padding: 0.5rem 0.75rem;
    font-size: 0.95rem;
  }

  .btn {
    padding: 0.4rem 1rem;
    font-size: 0.85rem;
  }
}

.site-footer {
  background: var(--color-primary-dark);
  border-top: 1px solid var(--color-border-subtle);
  padding: 3rem 1.5rem 1.5rem;
  position: relative;
}

.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-accent-gold), transparent);
  opacity: 0.4;
}

.footer-grid {
  max-width: var(--container-max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1.5fr;
  gap: 2.5rem;
}

.footer-logo {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-heading);
  font-size: 1.25rem;
  color: var(--color-text-primary);
  text-shadow: 0 0 6px var(--color-accent-gold);
  margin-bottom: 0.75rem;
}

.footer-logo:hover {
  color: var(--color-accent-gold);
}

.footer-tagline {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  line-height: 1.5;
}

.footer-heading {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  color: var(--color-accent-gold);
  margin-bottom: 0.75rem;
  letter-spacing: 0.06em;
}

.footer-link-list li {
  margin-bottom: 0.4rem;
}

.footer-link-list a {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
}

.footer-link-list a:hover {
  color: var(--color-accent-green);
}

.footer-contact p {
  color: var(--color-text-secondary);
  font-size: 0.85rem;
  margin-bottom: 0.35rem;
}

.footer-contact a {
  color: var(--color-text-secondary);
}

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

.footer-bottom {
  max-width: var(--container-max);
  margin: 2rem auto 0;
  padding-top: 1.25rem;
  border-top: 1px solid var(--color-border-subtle);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
}

.footer-bottom p {
  color: var(--color-text-secondary);
  font-size: 0.8rem;
}

.footer-statement {
  width: 100%;
  text-align: center;
  opacity: 0.7;
  font-style: italic;
}

@media (max-width: 48em) {
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

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

@media (min-width: 48.01em) and (max-width: 64em) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }
}

.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 900;
  width: 44px;
  height: 44px;
  border-radius: var(--border-radius-sharp);
  background: var(--color-surface-light);
  border: 1px solid var(--color-border-subtle);
  color: var(--color-accent-gold);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base), background var(--transition-base), box-shadow var(--transition-base);
}

.back-to-top.visible {
  opacity: 1;
  pointer-events: all;
}

.back-to-top:hover {
  background: var(--color-accent-gold);
  color: var(--color-primary-dark);
  box-shadow: 0 0 16px var(--color-hover-glow);
}

.back-to-top:focus-visible {
  outline: 2px solid var(--color-accent-green);
  outline-offset: 2px;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  padding: 1rem 0;
  font-size: 0.85rem;
  color: var(--color-text-secondary);
}

.breadcrumb-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.breadcrumb-item + .breadcrumb-item::before {
  content: '/';
  color: var(--color-border-subtle);
}

.breadcrumb-link {
  color: var(--color-text-secondary);
}

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

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

.grid {
  display: grid;
  gap: 1.5rem;
}

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

.grid-cols-3 {
  grid-template-columns: repeat(3, 1fr);
}

.grid-cols-4 {
  grid-template-columns: repeat(4, 1fr);
}

@media (max-width: 48em) {
  .grid-cols-2,
  .grid-cols-3,
  .grid-cols-4 {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 48.01em) and (max-width: 64em) {
  .grid-cols-3,
  .grid-cols-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

.card {
  background: var(--color-surface-light);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--border-radius-sharp);
  padding: 1.5rem;
  transition: box-shadow var(--transition-base), border-color var(--transition-base);
}

.card:hover {
  border-color: var(--color-accent-gold);
  box-shadow: 0 0 20px var(--color-hover-glow);
}

.section {
  padding: 4rem 0;
}

.section-title {
  font-family: var(--font-heading);
  font-size: 2rem;
  color: var(--color-accent-gold);
  margin-bottom: 1.5rem;
  text-shadow: 0 0 8px var(--color-accent-gold);
}

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

  html {
    scroll-behavior: auto;
  }

  .scroll-progress {
    display: none;
  }

  .site-header {
    transition: none;
  }

  .header-nav {
    transition: none;
  }

  .btn {
    transition: none;
  }

  .card {
    transition: none;
  }

  .back-to-top {
    transition: none;
  }
}