:root {
  --c-primary: #0B1D3A;
  --c-secondary: #132A54;
  --c-accent: #39FF14;
  --c-accent2: #FF6B00;
  --c-surface-dark: #071526;
  --c-surface-light: #F2F6FA;
  --c-text-light: #E8EDF2;
  --c-text-muted: #9AA7B8;
  --c-line: #2A3B5A;
  --c-warning: #FFD166;
  --font-sans: 'Inter Tight', 'Inter', 'Noto Sans SC', system-ui, -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --header-width: 280px;
  --topbar-height: 64px;
  --radius: 12px;
  --shadow: 0 20px 40px rgba(3, 10, 25, 0.25);
  --transition: 0.25s ease;
  --container-max: 1200px;
}

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

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

body {
  min-height: 100vh;
  font-family: var(--font-sans);
  font-weight: 400;
  line-height: 1.8;
  color: var(--c-primary);
  background: var(--c-surface-light);
  padding-top: var(--topbar-height);
}

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

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

ul[class],
ol[class] {
  list-style: none;
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
  touch-action: manipulation;
}

:focus-visible {
  outline: 3px solid var(--c-accent2);
  outline-offset: 3px;
  border-radius: 2px;
}

#main-content:focus {
  outline: none;
}

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

.container--narrow {
  max-width: 840px;
}

.section {
  padding: clamp(3rem, 8vw, 6rem) 0;
}

.section--split {
  display: grid;
  gap: 2rem;
  grid-template-columns: 1fr;
}

.display-title {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.02em;
  transform: skewX(-2deg);
}

.section-heading {
  font-size: clamp(1.8rem, 3vw, 2.5rem);
  font-weight: 900;
  line-height: 1.2;
  transform: skewX(-2deg);
}

.section-sub {
  color: var(--c-text-muted);
  max-width: 60ch;
}

.prose {
  max-width: 72ch;
}

.prose p {
  margin-bottom: 1.25rem;
}

.content-card {
  background: #ffffff;
  border-radius: var(--radius);
  padding: 2rem;
  border: 1px solid rgba(11, 29, 58, 0.08);
  box-shadow: 0 4px 12px rgba(11, 29, 58, 0.05);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 44px;
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  font-weight: 800;
  font-size: 1rem;
  line-height: 1;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease, border-color 0.2s ease;
  will-change: transform;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn:active {
  transform: translateY(0);
}

.btn--primary {
  background: var(--c-accent);
  color: var(--c-primary);
  box-shadow: 0 6px 0 rgba(57, 255, 20, 0.18);
}

.btn--primary:hover {
  background: #66ff4d;
  box-shadow: 0 10px 20px rgba(57, 255, 20, 0.25);
}

.btn--ghost {
  border: 2px solid var(--c-line);
  color: var(--c-primary);
  background: transparent;
}

.btn--ghost:hover {
  border-color: var(--c-primary);
  box-shadow: 0 6px 16px rgba(11, 29, 58, 0.08);
}

.btn--accent {
  background: var(--c-accent2);
  color: var(--c-primary);
  box-shadow: 0 6px 0 rgba(255, 107, 0, 0.18);
}

.btn--accent:hover {
  background: #ff8b30;
  box-shadow: 0 10px 20px rgba(255, 107, 0, 0.25);
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--c-text-muted);
  padding: 1.5rem 0 0;
}

.breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
}

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

.breadcrumbs__item + .breadcrumbs__item::before {
  content: '';
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--c-accent2);
}

.breadcrumbs__link {
  color: inherit;
}

.breadcrumbs__link:hover {
  color: var(--c-accent2);
}

.breadcrumbs__item[aria-current="page"] {
  color: var(--c-primary);
  font-weight: 700;
}

.data-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: 1fr;
}

.data-card {
  background: var(--c-secondary);
  color: var(--c-text-light);
  padding: 1.25rem;
  border-radius: var(--radius);
  border: 1px solid var(--c-line);
  box-shadow: var(--shadow);
  transition: transform 0.25s ease, border-color 0.25s ease;
}

.data-card:hover {
  transform: translateY(-4px);
  border-color: var(--c-accent);
}

.data-card__name {
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--c-text-muted);
}

.data-card__value {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 900;
  line-height: 1.1;
  color: var(--c-accent);
}

.data-card__meta {
  font-size: 0.875rem;
  color: var(--c-text-muted);
}

.media-frame {
  position: relative;
  overflow: hidden;
  background: var(--c-secondary);
  border-radius: var(--radius);
  aspect-ratio: 16 / 9;
}

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

.media-frame--ratio-1-1 {
  aspect-ratio: 1 / 1;
}

.media-frame img,
.media-frame__image {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(11, 29, 58, 0.1), rgba(57, 255, 20, 0.08));
  pointer-events: none;
}

.tag {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  line-height: 1.4;
}

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

.tag--orange {
  background: var(--c-accent2);
  color: #ffffff;
}

.tag--amber {
  background: var(--c-warning);
  color: var(--c-primary);
}

.timeline {
  position: relative;
  padding-left: 1.5rem;
  list-style: none;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 5px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--c-line);
}

.timeline__item {
  position: relative;
  padding-bottom: 1.5rem;
}

.timeline__item::before {
  content: '';
  position: absolute;
  left: -1.5rem;
  top: 0.35rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--c-accent2);
  border: 3px solid var(--c-surface-light);
}

.timeline__content {
  background: var(--c-secondary);
  color: var(--c-text-light);
  padding: 1rem;
  border-radius: 8px;
}

.skip-link {
  position: fixed;
  top: -100px;
  left: 1rem;
  z-index: 2000;
  background: var(--c-primary);
  color: var(--c-text-light);
  padding: 0.75rem 1rem;
  border-radius: 0 0 8px 8px;
  font-weight: 700;
  transition: top 0.2s ease;
}

.skip-link:focus-visible {
  top: 0;
  outline: 3px solid var(--c-accent);
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 1000;
  width: 100%;
  background:
    linear-gradient(135deg, rgba(57, 255, 20, 0.08) 0%, transparent 30%),
    linear-gradient(180deg, var(--c-primary), var(--c-surface-dark));
  color: var(--c-text-light);
  box-shadow: 0 10px 30px rgba(3, 10, 25, 0.3);
}

.site-header::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 4px;
  height: 100%;
  pointer-events: none;
  background: linear-gradient(to bottom, var(--c-accent), var(--c-accent2), transparent);
}

.site-header__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--topbar-height);
  padding: 0 1rem;
  border-bottom: 1px solid var(--c-line);
}

.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
}

.site-brand__mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  background: var(--c-accent);
  color: var(--c-primary);
  font-weight: 900;
  font-size: 1.1rem;
  line-height: 1;
  transform: skewX(-4deg);
  flex-shrink: 0;
}

.site-brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.site-brand__name {
  font-size: 1.25rem;
  font-weight: 900;
  letter-spacing: 0.02em;
}

.site-brand__sub {
  font-size: 0.675rem;
  letter-spacing: 0.18em;
  color: var(--c-text-muted);
  font-weight: 600;
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  height: 44px;
  padding: 0 0.75rem;
  color: var(--c-text-light);
  border: 1px solid var(--c-line);
  border-radius: 8px;
  transition: border-color 0.2s ease, background 0.2s ease;
}

.nav-toggle:hover {
  border-color: var(--c-accent);
  background: rgba(57, 255, 20, 0.08);
}

.nav-toggle__label {
  font-weight: 700;
  font-size: 0.875rem;
}

.nav-toggle__icon {
  position: relative;
  width: 18px;
  height: 2px;
  background: currentColor;
  transition: background 0.2s ease;
}

.nav-toggle__icon::before,
.nav-toggle__icon::after {
  content: '';
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: currentColor;
  transition: transform 0.2s ease;
}

.nav-toggle__icon::before {
  top: -5px;
}

.nav-toggle__icon::after {
  top: 5px;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__icon {
  background: transparent;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__icon::before {
  transform: translateY(5px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__icon::after {
  transform: translateY(-5px) rotate(-45deg);
}

.site-nav {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  max-height: 0;
  visibility: hidden;
  overflow: hidden;
  background: var(--c-primary);
  border-top: 1px solid var(--c-line);
  transition: max-height 0.3s ease, visibility 0.3s ease;
}

.site-nav[data-open] {
  max-height: calc(100vh - var(--topbar-height));
  overflow-y: auto;
  visibility: visible;
  box-shadow: 0 20px 30px rgba(3, 10, 25, 0.3);
}

.site-nav__list {
  display: flex;
  flex-direction: column;
  padding: 0.5rem 1rem 1rem;
}

.site-nav__item + .site-nav__item {
  margin-top: 0.25rem;
}

.site-nav__link {
  display: flex;
  align-items: center;
  min-height: 48px;
  padding: 0 0.75rem;
  border-radius: 8px;
  font-weight: 700;
  color: var(--c-text-light);
  border-left: 3px solid transparent;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.site-nav__link:hover {
  background: rgba(255, 255, 255, 0.05);
  color: var(--c-accent);
}

.site-nav__link[aria-current="page"] {
  background: rgba(57, 255, 20, 0.12);
  color: var(--c-accent);
  border-left-color: var(--c-accent);
}

.site-header__foot {
  display: none;
}

.status-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--c-accent);
  box-shadow: 0 0 8px var(--c-accent);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%,
  100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.5;
    transform: scale(0.8);
  }
}

.site-progress {
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 5;
  width: 100%;
  height: 4px;
  transform: scaleX(0);
  transform-origin: left;
  background: linear-gradient(90deg, var(--c-accent), var(--c-accent2));
  display: none;
}

.site-footer {
  background: var(--c-surface-dark);
  color: var(--c-text-light);
  padding: clamp(2rem, 5vw, 4rem) 0 0;
  position: relative;
  border-top: 4px solid var(--c-line);
}

.site-footer::before {
  content: '';
  position: absolute;
  top: -4px;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--c-accent), var(--c-accent2), transparent);
}

.site-footer__inner {
  width: min(100% - 2rem, var(--container-max));
  margin-inline: auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  padding-bottom: 2rem;
}

.site-footer__brand {
  display: block;
}

.site-brand--footer .site-brand__mark {
  width: 48px;
  height: 48px;
  font-size: 1.2rem;
}

.site-brand--footer .site-brand__name {
  font-size: 1.5rem;
}

.site-footer__mission {
  max-width: 36ch;
  margin-top: 1rem;
  color: var(--c-text-muted);
  font-size: 0.925rem;
  line-height: 1.7;
}

.site-footer__col {
  display: flex;
  flex-direction: column;
}

.site-footer__heading {
  font-size: 0.85rem;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--c-accent);
  margin-bottom: 1rem;
}

.site-footer__list {
  list-style: none;
  display: grid;
  gap: 0.5rem;
}

.site-footer__list a {
  color: var(--c-text-light);
  transition: color 0.2s ease, padding-left 0.2s ease;
}

.site-footer__list a:hover {
  color: var(--c-accent2);
  padding-left: 4px;
}

.site-footer__meta {
  font-size: 0.875rem;
  color: var(--c-text-muted);
  line-height: 1.6;
}

.site-footer__bottom {
  border-top: 1px solid var(--c-line);
  width: min(100% - 2rem, var(--container-max));
  margin-inline: auto;
  padding: 1.25rem 0;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: space-between;
  align-items: center;
  font-size: 0.875rem;
  color: var(--c-text-muted);
}

.site-footer__bottom p {
  margin: 0;
}

@media (min-width: 768px) {
  .section--split {
    grid-template-columns: 1.2fr 0.8fr;
  }

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

  .site-footer__inner {
    grid-template-columns: 1.2fr 1fr 1fr 1fr;
  }
}

@media (min-width: 1024px) {
  body {
    padding-top: 0;
    padding-left: var(--header-width);
  }

  .site-header {
    width: var(--header-width);
    height: 100vh;
    display: flex;
    flex-direction: column;
    box-shadow: 10px 0 30px rgba(3, 10, 25, 0.3);
  }

  .site-header__bar {
    height: auto;
    padding: 1.5rem 1.25rem;
    border-bottom: 1px solid var(--c-line);
  }

  .nav-toggle {
    display: none;
  }

  .site-nav {
    position: static;
    max-height: none;
    visibility: visible;
    overflow: visible;
    border-top: 0;
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
  }

  .site-nav__list {
    padding: 1.25rem;
    gap: 0.25rem;
  }

  .site-header__foot {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1.25rem;
    border-top: 1px solid var(--c-line);
    font-size: 0.75rem;
    color: var(--c-text-muted);
  }

  .site-progress {
    display: block;
  }

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

@media (max-width: 1023px) {
  .site-progress {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  html {
    scroll-behavior: auto;
  }
}