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

html {
  scroll-behavior: smooth;
}

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

ul,
ol {
  list-style: none;
}

:root {
  --c-primary: #0A1B31;
  --c-secondary: #0F2D4A;
  --c-accent: #39FF88;
  --c-warning: #FF6B35;
  --c-text: #E8F0FE;
  --c-sub: #9BB8D4;
  --c-surface: #F4F7FB;
  --c-divider: #1E3A5F;
  --c-hover: #14365C;
  --header-w: 280px;
  --header-h: 64px;
  --container-w: 1200px;
  --gap: 24px;
  --tr: 0.25s ease;
  --font-head: 'Noto Sans SC', 'Source Han Sans CN', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-body: 'Noto Sans SC', 'Source Sans Pro', 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', Consolas, 'Courier New', monospace;
}

body {
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--c-text);
  background-color: var(--c-primary);
}

a {
  color: var(--c-accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--tr), border-color var(--tr), background-color var(--tr);
}

a:hover {
  color: var(--c-accent);
  border-color: currentColor;
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--c-accent);
  outline-offset: 4px;
}

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

.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;
}

.skip-link {
  position: fixed;
  top: -60px;
  left: 16px;
  z-index: 2001;
  padding: 8px 20px;
  background: var(--c-accent);
  color: var(--c-primary);
  font-weight: 700;
  font-size: 14px;
  border-bottom: none;
  transition: top 0.2s ease;
}

.skip-link:focus,
.skip-link:focus-visible {
  top: 12px;
  outline: none;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 1000;
  width: var(--header-w);
  height: 100vh;
  display: flex;
  flex-direction: column;
  padding: 32px 24px;
  background: var(--c-primary);
  border-right: 1px solid var(--c-divider);
  transition: background-color var(--tr), box-shadow var(--tr), backdrop-filter var(--tr);
  overflow-y: auto;
}

.site-header.is-overlay:not(.is-solid) {
  background: rgba(10, 27, 49, 0.82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.site-header.is-solid {
  background: var(--c-primary);
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
  box-shadow: 6px 0 20px rgba(0, 0, 0, 0.25);
}

.header-brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  flex-shrink: 0;
}

.brand-logo {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  border-bottom: none;
  flex-shrink: 0;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: var(--c-accent);
  color: var(--c-primary);
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 18px;
  letter-spacing: -0.02em;
}

.brand-text {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 18px;
  letter-spacing: 0.01em;
  color: var(--c-text);
}

.header-tagline {
  display: block;
  margin-top: 8px;
  padding-left: 56px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-sub);
}

.main-nav {
  display: flex;
  flex-direction: column;
  flex: 1;
  margin-top: 48px;
}

.nav-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  font-family: var(--font-head);
  font-size: 15px;
  font-weight: 700;
  color: var(--c-sub);
  border-left: 3px solid transparent;
  border-bottom: none;
  transition: color var(--tr), background-color var(--tr), border-color var(--tr);
}

.nav-link:hover {
  background-color: var(--c-hover);
  color: var(--c-text);
}

.nav-link[aria-current="page"] {
  border-left-color: var(--c-accent);
  color: var(--c-accent);
  background: rgba(57, 255, 136, 0.06);
}

.nav-index {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-divider);
  min-width: 14px;
  transition: color var(--tr);
}

.nav-link:hover .nav-index,
.nav-link[aria-current="page"] .nav-index {
  color: var(--c-accent);
}

.header-aux {
  margin-top: auto;
  padding-top: 24px;
  border-top: 1px solid var(--c-divider);
}

.aux-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-sub);
  margin-bottom: 8px;
}

.aux-link {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  color: var(--c-warning);
  border-bottom: 1px solid var(--c-warning);
  padding-bottom: 2px;
  transition: color var(--tr), border-color var(--tr);
}

.aux-link:hover {
  color: var(--c-accent);
  border-color: var(--c-accent);
}

.nav-toggle {
  display: none;
  position: absolute;
  top: 10px;
  right: 12px;
  width: 44px;
  height: 44px;
  padding: 10px;
  background: transparent;
  border: 1px solid var(--c-divider);
  cursor: pointer;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  border-radius: 0;
  transition: border-color var(--tr), background-color var(--tr);
}

.nav-toggle:hover {
  border-color: var(--c-accent);
  background: var(--c-hover);
}

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

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

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

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

.scroll-progress {
  position: absolute;
  top: 0;
  right: 0;
  width: 3px;
  height: 100%;
  background: linear-gradient(180deg, var(--c-accent), var(--c-warning));
  transform: scaleY(var(--progress, 0));
  transform-origin: top;
  pointer-events: none;
}

.site-footer {
  margin-left: var(--header-w);
  background: var(--c-primary);
  border-top: 1px solid var(--c-divider);
  color: var(--c-sub);
}

.footer-main {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 64px 24px 40px;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 48px;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 16px;
}

.footer-trust {
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-sub);
  max-width: 280px;
}

.footer-tagline {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-divider);
}

.footer-title {
  display: inline-block;
  padding-bottom: 8px;
  margin-bottom: 16px;
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 900;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--c-text);
  border-bottom: 2px solid var(--c-accent);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  color: var(--c-sub);
  font-size: 14px;
  border-bottom: none;
}

.footer-links a:hover {
  color: var(--c-accent);
  border-bottom-color: var(--c-accent);
}

.footer-contact .contact-line {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--c-sub);
  margin-bottom: 6px;
}

.footer-bottom {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 20px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--c-divider);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-sub);
}

.footer-icp {
  color: var(--c-divider);
}

#main-content {
  margin-left: var(--header-w);
  min-height: 60vh;
  background-color: var(--c-primary);
  color: var(--c-text);
}

.container {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 24px;
}

.hero[data-hero] {
  position: relative;
  width: 100%;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 40px 48px;
  overflow: hidden;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.06em;
  border: 1px solid transparent;
  background: transparent;
  cursor: pointer;
  text-transform: uppercase;
  transition: background-color var(--tr), color var(--tr), border-color var(--tr);
}

.btn-solid {
  background: var(--c-accent);
  color: var(--c-primary);
}

.btn-solid:hover {
  background: rgba(57, 255, 136, 0.8);
  color: var(--c-primary);
}

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

.btn-outline:hover {
  background: rgba(57, 255, 136, 0.15);
  color: var(--c-accent);
}

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

.btn-warning:hover {
  background: rgba(255, 107, 53, 0.85);
  color: var(--c-primary);
}

.section {
  padding: 96px 0;
}

.section-index {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--c-accent);
  letter-spacing: 0.08em;
}

.section-title {
  font-family: var(--font-head);
  font-size: 36px;
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.2;
  color: var(--c-text);
}

.section-sub {
  margin-top: 16px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-sub);
  max-width: 640px;
}

.grid {
  display: grid;
  gap: var(--gap);
}

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

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

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

.panel {
  background: var(--c-secondary);
  border: 1px solid var(--c-divider);
  padding: 24px;
  transition: border-color var(--tr), transform var(--tr);
}

.panel:hover {
  border-color: var(--c-accent);
  transform: translateY(-2px);
}

.panel-solid {
  background: var(--c-primary);
  border-color: var(--c-divider);
}

.panel-accent {
  border-left: 3px solid var(--c-accent);
}

.stat {
  padding: 16px 20px;
  background: var(--c-secondary);
  border-top: 2px solid var(--c-accent);
}

.stat-value {
  font-family: var(--font-mono);
  font-size: 32px;
  font-weight: 700;
  color: var(--c-accent);
  line-height: 1.2;
}

.stat-label {
  margin-top: 4px;
  font-size: 13px;
  color: var(--c-sub);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.tag {
  display: inline-block;
  padding: 4px 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  background: rgba(57, 255, 136, 0.12);
  color: var(--c-accent);
  border: 1px solid var(--c-accent);
  text-transform: uppercase;
}

.tag-warning {
  background: rgba(255, 107, 53, 0.12);
  color: var(--c-warning);
  border-color: var(--c-warning);
}

.rule {
  height: 1px;
  border: none;
  background: var(--c-divider);
  margin: 40px 0;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 16px 0;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--c-sub);
}

.breadcrumb a {
  color: var(--c-sub);
  border-bottom: none;
}

.breadcrumb a:hover {
  color: var(--c-accent);
}

.breadcrumb-sep {
  color: var(--c-divider);
}

.img-frame {
  position: relative;
  overflow: hidden;
  background-color: var(--c-secondary);
  border: 1px solid var(--c-divider);
}

.img-frame::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, rgba(10, 27, 49, 0.2), transparent 60%);
  pointer-events: none;
}

.img-frame img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.img-16x9 {
  aspect-ratio: 16 / 9;
}

.img-4x3 {
  aspect-ratio: 4 / 3;
}

.img-full {
  aspect-ratio: 21 / 9;
}

.text-accent {
  color: var(--c-accent);
}

.text-warning {
  color: var(--c-warning);
}

.bg-secondary {
  background: var(--c-secondary);
}

.bg-surface {
  background: var(--c-surface);
  color: var(--c-primary);
}

.bg-surface .section-title,
.bg-surface .section-sub {
  color: var(--c-primary);
}

@media (min-width: 1024px) {
  .nav-toggle {
    display: none;
  }
}

@media (max-width: 1023px) {
  .site-header {
    width: 100%;
    height: var(--header-h);
    flex-direction: row;
    align-items: center;
    padding: 0 16px;
    border-right: none;
    border-bottom: 1px solid var(--c-divider);
  }

  .site-header.is-solid {
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.25);
  }

  .header-brand {
    margin-right: auto;
  }

  .header-tagline {
    display: none;
  }

  .main-nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    margin-top: 0;
    display: none;
    flex-direction: column;
    gap: 0;
    padding: 24px 16px;
    background: var(--c-primary);
    border-bottom: 1px solid var(--c-divider);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.35);
  }

  .main-nav[data-open="true"] {
    display: flex;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .header-aux {
    margin-top: 24px;
    padding-top: 16px;
  }

  .scroll-progress {
    top: auto;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 3px;
    transform: scaleX(var(--progress, 0));
    transform-origin: left;
    background: linear-gradient(90deg, var(--c-accent), var(--c-warning));
  }

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

  #main-content {
    padding-top: var(--header-h);
  }

  .footer-main {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    padding-top: 48px;
  }

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

  .hero[data-hero] {
    min-height: calc(100vh - var(--header-h));
    padding: 24px 20px;
  }
}

@media (max-width: 767px) {
  .footer-main {
    grid-template-columns: 1fr;
  }

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

  .footer-bottom {
    flex-direction: column;
    gap: 6px;
    text-align: center;
  }

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

  .section {
    padding: 64px 0;
  }

  .section-title {
    font-size: 28px;
  }

  .hero[data-hero] {
    padding: 16px;
  }
}

@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;
  }
}

@media (prefers-reduced-motion: reduce) {
  .scroll-progress {
    display: none;
  }
}