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

:root {
  --ink: #0a0a0a;
  --paper: #f2f2ec;
  --orange: #ff6b35;
  --neon: #c6f91f;
  --deep-blue: #0a1f3c;
  --slate: #2a3b57;
  --soft: #e4e4df;
  --text-light: #e0e6ed;
  --text-dark: #111111;
  --shadow: rgba(0, 0, 0, 0.35);

  --font-heading: "Bebas Neue", "Oswald", "Arial Narrow",
    "Source Han Sans CN", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Source Han Sans CN", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-number: "JetBrains Mono", "Roboto Mono", "Consolas", monospace;

  --max-w: 1280px;
  --gutter: 24px;
  --bd-sm: 2px;
  --bd-lg: 4px;
  --shadow-hard: 6px 6px 0 var(--shadow);
  --ease: cubic-bezier(0.23, 1, 0.32, 1);
}

html {
  scroll-behavior: smooth;
  background: var(--paper);
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.75;
  color: var(--text-dark);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
}

main {
  display: block;
  min-height: 65vh;
}

main:focus {
  outline: none;
}

p {
  margin-bottom: 1rem;
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-heading);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  line-height: 1.15;
  color: var(--text-dark);
}

h1 {
  font-size: clamp(2.6rem, 5vw, 4.2rem);
}

h2 {
  font-size: clamp(2rem, 4vw, 3rem);
}

h3 {
  font-size: 1.4rem;
}

h4 {
  font-size: 1.1rem;
}

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

ul,
ol {
  list-style: none;
}

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

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

:focus-visible {
  outline: 3px solid var(--neon);
  outline-offset: 3px;
  border-radius: 0;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.container {
  width: min(calc(100% - var(--gutter) * 2), var(--max-w));
  margin-inline: auto;
}

.skip-link {
  position: absolute;
  top: -60px;
  left: 16px;
  z-index: 2000;
  background: var(--orange);
  color: #fff;
  font-weight: 700;
  padding: 10px 20px;
  border: var(--bd-sm) solid var(--ink);
  box-shadow: 4px 4px 0 var(--shadow);
  transition: top 0.2s var(--ease);
}

.skip-link:focus {
  top: 8px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  font-family: var(--font-heading);
  font-size: 1rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: var(--paper);
  color: var(--text-dark);
  border: var(--bd-sm) solid var(--ink);
  box-shadow: 4px 4px 0 var(--shadow);
  transition: transform 0.18s var(--ease), box-shadow 0.18s var(--ease), background 0.18s ease;
}

.btn:hover {
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0 var(--shadow);
  background: var(--neon);
}

.btn:active {
  transform: translate(4px, 4px);
  box-shadow: 0 0 0 var(--shadow);
}

.btn-primary {
  background: var(--orange);
  color: #fff;
  border-color: var(--ink);
}

.btn-primary:hover {
  background: #ff8a4d;
  color: #fff;
}

.btn--header {
  padding: 8px 18px;
  font-size: 0.9rem;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--deep-blue);
  color: var(--text-light);
  border-bottom: var(--bd-lg) solid var(--orange);
}

.header-progress {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--neon);
  transform: scaleX(0);
  transform-origin: left center;
  z-index: 2;
  pointer-events: none;
}

.header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--gutter);
  min-height: 72px;
  padding-block: 10px;
}

.site-logo {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: #fff;
}

.site-logo::before {
  content: "";
  width: 14px;
  height: 14px;
  flex: none;
  background: var(--orange);
  transform: rotate(45deg);
}

.site-logo__cn {
  font-family: var(--font-heading);
  font-size: 2rem;
  line-height: 1;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #fff;
}

.site-logo__badge {
  font-family: var(--font-number);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--ink);
  background: var(--neon);
  padding: 2px 8px;
  transform: translateY(2px);
}

.header-tools {
  display: flex;
  align-items: center;
  gap: 16px;
}

.header-tip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-number);
  font-size: 0.82rem;
  color: var(--text-light);
  padding: 6px 14px;
  border: 1px solid rgba(224, 230, 237, 0.25);
}

.tip-pulse {
  width: 8px;
  height: 8px;
  background: var(--neon);
  animation: pulse 1.8s ease-in-out infinite;
}

@keyframes pulse {
  0%,
  100% {
    opacity: 1;
  }

  50% {
    opacity: 0.3;
  }
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 40px;
  padding: 6px;
  border: 1px solid rgba(224, 230, 237, 0.35);
}

.nav-toggle-line {
  display: block;
  width: 22px;
  height: 3px;
  flex: none;
  background: var(--text-light);
  transition: transform 0.3s var(--ease), opacity 0.2s;
}

.nav-toggle.is-active .nav-toggle-line:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.nav-toggle.is-active .nav-toggle-line:nth-child(2) {
  opacity: 0;
}

.nav-toggle.is-active .nav-toggle-line:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

.site-nav {
  border-top: 1px solid rgba(224, 230, 237, 0.18);
}

.site-nav-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: var(--gutter);
  counter-reset: nav-count;
}

.nav-item {
  counter-increment: nav-count;
  position: relative;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 18px 10px;
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--text-light);
  letter-spacing: 0.03em;
  border-bottom: 3px solid transparent;
  transition: color 0.2s, background-color 0.2s, border-color 0.2s;
}

.nav-link::before {
  content: "0" counter(nav-count);
  font-family: var(--font-number);
  font-size: 0.7rem;
  line-height: 1;
  color: var(--neon);
  opacity: 0.7;
  transform: translateY(2px);
}

.nav-link:hover {
  color: var(--neon);
}

.nav-link[aria-current="page"] {
  color: var(--neon);
  border-bottom-color: var(--neon);
}

.site-footer {
  background: var(--deep-blue);
  color: var(--text-light);
  border-top: var(--bd-lg) solid var(--orange);
  margin-top: 72px;
}

.footer-pattern {
  height: 14px;
  background: repeating-linear-gradient(
    -45deg,
    var(--orange) 0 12px,
    var(--deep-blue) 12px 24px
  );
  border-bottom: 2px solid var(--deep-blue);
}

.footer-main {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 48px;
  padding-block: 48px 36px;
}

.footer-logo {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: 2.2rem;
  line-height: 1;
  letter-spacing: 0.06em;
  color: #fff;
  text-transform: uppercase;
}

.footer-tagline {
  margin-top: 10px;
  margin-bottom: 20px;
  font-size: 0.95rem;
  color: rgba(224, 230, 237, 0.7);
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.footer-col-title {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  letter-spacing: 0.12em;
  color: var(--neon);
  margin-bottom: 14px;
  text-transform: uppercase;
}

.footer-col-list li {
  margin-bottom: 8px;
}

.footer-col-list a,
.footer-col-list span {
  font-size: 0.9rem;
  color: var(--text-light);
  overflow-wrap: break-word;
  transition: color 0.2s;
}

.footer-col-list a:hover {
  color: var(--neon);
}

.footer-bottom {
  border-top: 1px solid rgba(224, 230, 237, 0.12);
}

.footer-bottom-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  padding-block: 18px;
  font-size: 0.82rem;
  color: rgba(224, 230, 237, 0.6);
}

.footer-bottom-inner p {
  margin: 0;
}

.btn-scroll-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 500;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  font-family: var(--font-heading);
  font-size: 0.9rem;
  letter-spacing: 0.08em;
  padding: 10px 18px;
  background: var(--slate);
  color: var(--text-light);
  border: var(--bd-sm) solid var(--ink);
  box-shadow: 4px 4px 0 var(--shadow);
  transition: opacity 0.3s var(--ease), visibility 0.3s var(--ease), background 0.2s, color 0.2s;
}

.btn-scroll-top.is-visible {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.btn-scroll-top:hover {
  background: var(--neon);
  color: var(--ink);
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  padding-block: 20px;
  font-size: 0.85rem;
  color: var(--slate);
}

.breadcrumbs a {
  font-weight: 600;
  color: var(--slate);
  transition: color 0.2s;
}

.breadcrumbs a:hover {
  color: var(--orange);
}

.breadcrumbs .sep {
  font-family: var(--font-number);
  margin: 0 2px;
  color: var(--orange);
}

.breadcrumbs [aria-current="page"] {
  color: var(--text-dark);
  font-weight: 700;
}

.marker-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-number);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--ink);
  background: var(--neon);
  padding: 3px 10px;
  border: 1px solid var(--ink);
}

.marker-tag::before {
  content: "";
  width: 6px;
  height: 6px;
  flex: none;
  background: var(--ink);
  transform: rotate(45deg);
}

.section-band {
  padding-block: 60px;
}

.band-dark {
  background: var(--ink);
  color: var(--text-light);
}

.band-blue {
  background: var(--deep-blue);
  color: var(--text-light);
}

.band-light {
  background: var(--soft);
  color: var(--text-dark);
}

.band-dark h1,
.band-dark h2,
.band-dark h3,
.band-blue h1,
.band-blue h2,
.band-blue h3 {
  color: #fff;
}

.data-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
}

.stat-block {
  background: var(--paper);
  border: var(--bd-sm) solid var(--ink);
  box-shadow: var(--shadow-hard);
  padding: 20px 16px;
  min-height: 100px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.stat-block__num {
  font-family: var(--font-number);
  font-size: 2.2rem;
  font-weight: 700;
  line-height: 1.1;
  color: var(--orange);
}

.stat-block__label {
  font-size: 0.85rem;
  color: var(--slate);
  margin-top: 8px;
}

.image-frame {
  position: relative;
  display: block;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border: var(--bd-lg) solid var(--ink);
  box-shadow: var(--shadow-hard);
  background: var(--slate);
}

.image-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent 70%, var(--orange) 100%);
  opacity: 0.2;
  transition: opacity 0.3s;
}

.image-frame:hover::after {
  opacity: 0.45;
}

.image-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(0.3) contrast(1.08);
  transition: transform 0.4s var(--ease);
}

.image-frame:hover img {
  transform: scale(1.03);
}

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

  .header-tip {
    display: none;
  }

  .site-nav {
    display: none;
  }

  .site-nav.is-open {
    display: block;
  }

  .site-nav-list {
    flex-direction: column;
    justify-content: flex-start;
    padding-inline: 0;
    width: 100%;
  }

  .nav-link {
    padding: 14px 24px;
    border-bottom: 1px solid rgba(224, 230, 237, 0.08);
    border-radius: 0;
  }

  .nav-link[aria-current="page"] {
    background: rgba(198, 249, 31, 0.08);
  }

  .nav-link:hover {
    background: rgba(198, 249, 31, 0.12);
  }

  .footer-main {
    grid-template-columns: 1fr;
    gap: 36px;
    padding-block: 36px 24px;
  }

  .footer-cols {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
  }
}

@media (max-width: 560px) {
  .header-bar {
    padding-block: 8px;
    gap: 12px;
  }

  .site-logo__cn {
    font-size: 1.6rem;
  }

  .site-logo__badge {
    font-size: 0.65rem;
    padding: 1px 6px;
  }

  .btn--header {
    padding: 6px 12px;
    font-size: 0.82rem;
  }

  .header-tools {
    gap: 8px;
  }

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

  .footer-bottom-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .btn-scroll-top {
    right: 16px;
    bottom: 16px;
  }
}

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

  html {
    scroll-behavior: auto;
  }
}