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

:root {
  --color-primary: #0A1F3E;
  --color-primary-deep: #0D1B2A;
  --color-paper: #F5E9D7;
  --color-ink: #1B1B1B;
  --color-white: #FFFFFF;
  --color-accent: #39FF14;
  --color-gold: #FFD700;
  --color-gray: #333333;
  --color-gray-light: #E0E0E0;
  --color-border: rgba(255, 255, 255, 0.08);
  --color-soft: rgba(255, 255, 255, 0.65);

  --font-title: Impact, 'Arial Black', 'Noto Sans CJK SC', sans-serif;
  --font-body: 'Noto Sans CJK SC', 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'Roboto Mono', 'Courier New', monospace;

  --header-width: 88px;
  --header-width-expanded: 264px;
  --header-height-mobile: 64px;
  --content-max: 1200px;
  --content-pad: 24px;
  --radius: 2px;
  --t-fast: 0.18s ease;
  --t-slow: 0.32s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  color-scheme: dark;
}

body {
  font-family: var(--font-body);
  background: var(--color-primary);
  color: var(--color-white);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-tap-highlight-color: transparent;
}

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

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

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

ul {
  list-style: none;
}

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

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-title);
  line-height: 1.15;
  letter-spacing: 0.02em;
  font-weight: 700;
  text-transform: uppercase;
}

h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.5rem); }
h3 { font-size: 1.2rem; }

p {
  line-height: 1.7;
}

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

.skip-link {
  position: fixed;
  top: -100%;
  left: 50%;
  transform: translateX(-50%);
  z-index: 9999;
  background: var(--color-gold);
  color: var(--color-primary-deep);
  padding: 12px 24px;
  font-weight: 700;
  font-size: 0.9rem;
  border-radius: 0 0 var(--radius) var(--radius);
  transition: top var(--t-fast);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.skip-link:focus {
  top: 0;
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: transparent;
  z-index: 3000;
  pointer-events: none;
}

.scroll-progress span {
  display: block;
  height: 100%;
  width: 0;
  background: var(--color-accent);
  box-shadow: 0 0 8px rgba(57, 255, 20, 0.6);
  transition: width 0.05s linear;
}

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

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--header-width);
  display: flex;
  flex-direction: column;
  align-items: stretch;
  background:
    linear-gradient(135deg, rgba(57, 255, 20, 0.04) 0%, transparent 45%),
    linear-gradient(180deg, var(--color-primary) 0%, var(--color-primary-deep) 100%);
  border-right: 1px solid var(--color-border);
  z-index: 1000;
  transition: width var(--t-slow);
}

.site-header:hover,
.site-header:focus-within {
  width: var(--header-width-expanded);
}

.header-brand {
  flex-shrink: 0;
  padding: 20px 0 0;
  display: flex;
  justify-content: center;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 4px 0;
  min-height: 48px;
}

.brand-mark {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-title);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-gold);
  border: 2px solid var(--color-gold);
  background: var(--color-primary-deep);
  position: relative;
  letter-spacing: 0.05em;
}

.brand-copy {
  display: flex;
  flex-direction: column;
  justify-content: center;
  width: 0;
  overflow: hidden;
  white-space: nowrap;
  opacity: 0;
  visibility: hidden;
  transition: width var(--t-slow), opacity var(--t-fast) 0.08s, visibility var(--t-fast);
}

.site-header:hover .brand-copy,
.site-header:focus-within .brand-copy {
  width: 180px;
  opacity: 1;
  visibility: visible;
}

.brand-name {
  font-family: var(--font-title);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-white);
  letter-spacing: 0.04em;
  line-height: 1.2;
}

.brand-tagline {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  color: var(--color-soft);
  letter-spacing: 0.12em;
  margin-top: 4px;
  white-space: nowrap;
}

.site-nav {
  flex: 1;
  display: flex;
  flex-direction: column;
  width: 100%;
  padding: 24px 0 0;
}

.nav-list {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.nav-main {
  flex-shrink: 0;
}

.nav-system {
  flex-shrink: 0;
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--color-border);
}

.nav-item {
  width: 100%;
}

.nav-link {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  width: 100%;
  padding: 10px 0;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  color: var(--color-white);
  position: relative;
  transition: background var(--t-fast), color var(--t-fast), justify-content var(--t-slow);
  border-left: 3px solid transparent;
}

.site-header:hover .nav-link,
.site-header:focus-within .nav-link {
  justify-content: flex-start;
  padding-left: 22px;
  padding-right: 12px;
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--color-accent);
  background: rgba(57, 255, 20, 0.07);
}

.nav-link[aria-current="page"] {
  color: var(--color-accent);
  background: rgba(57, 255, 20, 0.1);
  border-left-color: var(--color-accent);
}

.nav-link[aria-current="page"]::after {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  width: 3px;
  height: 100%;
  background: var(--color-accent);
}

.nav-index {
  flex-shrink: 0;
  width: 20px;
  text-align: center;
  opacity: 0.75;
  font-size: 0.75rem;
}

.nav-link[aria-current="page"] .nav-index {
  opacity: 1;
}

.nav-label {
  display: inline-block;
  width: 0;
  overflow: hidden;
  white-space: nowrap;
  opacity: 0;
  visibility: hidden;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  transition: width var(--t-slow), opacity var(--t-fast) 0.06s, visibility var(--t-fast);
}

.site-header:hover .nav-label,
.site-header:focus-within .nav-label {
  width: 130px;
  opacity: 1;
  visibility: visible;
}

.header-meta {
  margin-top: auto;
  padding: 16px 0 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.14em;
  color: var(--color-soft);
}

.header-live {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--color-accent);
  font-weight: 700;
  white-space: nowrap;
  font-size: 0.62rem;
}

.live-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
  flex-shrink: 0;
  animation: live-pulse 1.6s ease-in-out infinite;
}

@keyframes live-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

@media (prefers-reduced-motion: reduce) {
  .live-dot {
    animation: none;
  }
}

.header-clock {
  font-size: 0.6rem;
  color: rgba(255, 255, 255, 0.35);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 6px;
  width: 42px;
  height: 42px;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: var(--radius);
  cursor: pointer;
  flex-shrink: 0;
  transition: border-color var(--t-fast), background var(--t-fast);
}

.nav-toggle:hover,
.nav-toggle:focus-visible {
  border-color: var(--color-accent);
  background: rgba(57, 255, 20, 0.06);
}

.toggle-bar {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--color-white);
  transition: transform var(--t-fast), opacity var(--t-fast), background var(--t-fast);
}

.nav-toggle[aria-expanded="true"] .toggle-bar:nth-child(1) {
  transform: translateY(8px) 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(-8px) rotate(-45deg);
}

.site-footer {
  margin-left: var(--header-width);
  background:
    linear-gradient(135deg, rgba(255, 215, 0, 0.02) 0%, transparent 40%),
    var(--color-primary-deep);
  border-top: 1px solid var(--color-border);
  position: relative;
}

.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 140px;
  height: 3px;
  background: var(--color-gold);
}

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

.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-title);
  font-size: 1.55rem;
  font-weight: 700;
  color: var(--color-white);
  letter-spacing: 0.04em;
  margin-bottom: 10px;
}

.footer-brand::before {
  content: '';
  width: 10px;
  height: 10px;
  background: var(--color-gold);
  flex-shrink: 0;
}

.footer-tagline {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--color-accent);
  letter-spacing: 0.14em;
  margin-bottom: 20px;
}

.footer-trust {
  font-size: 0.85rem;
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.65);
  max-width: 320px;
}

.footer-heading {
  font-family: var(--font-title);
  font-size: 0.9rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--color-gold);
  margin-bottom: 20px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

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

.footer-link {
  color: rgba(255, 255, 255, 0.72);
  font-size: 0.9rem;
  transition: color var(--t-fast), padding-left var(--t-fast);
}

.footer-link:hover,
.footer-link:focus-visible {
  color: var(--color-accent);
  padding-left: 6px;
}

.footer-contact-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.72);
  line-height: 1.6;
}

.footer-sep {
  border: none;
  border-top: 1px solid rgba(255, 255, 255, 0.07);
  max-width: var(--content-max);
  margin: 0 auto;
}

.footer-bottom {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 20px var(--content-pad) 36px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 24px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.45);
}

.footer-copyright {
  color: rgba(255, 255, 255, 0.62);
}

.footer-icp {
  color: rgba(255, 255, 255, 0.38);
}

.footer-note {
  color: rgba(255, 255, 255, 0.38);
}

.main-content {
  margin-left: var(--header-width);
  min-height: 60vh;
}

.container {
  max-width: var(--content-max);
  margin: 0 auto;
  padding-left: var(--content-pad);
  padding-right: var(--content-pad);
}

.container-narrow {
  max-width: 760px;
}

.section {
  padding: 72px 0;
}

.section-dark {
  background: var(--color-primary-deep);
}

.section-paper {
  background: var(--color-paper);
  color: var(--color-ink);
}

.page-header {
  padding: 72px 0 40px;
}

.page-kicker {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 16px;
}

.page-title {
  margin-bottom: 16px;
}

.page-description {
  max-width: 640px;
  font-size: 1.05rem;
  color: var(--color-soft);
  line-height: 1.8;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: rgba(255, 255, 255, 0.5);
  margin-bottom: 32px;
}

.breadcrumb a {
  color: var(--color-white);
  transition: color var(--t-fast);
}

.breadcrumb a:hover,
.breadcrumb a:focus-visible {
  color: var(--color-accent);
}

.breadcrumb-sep {
  color: var(--color-accent);
  opacity: 0.55;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 28px;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 0.95rem;
  border: 2px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  text-decoration: none;
  transition: border-color var(--t-fast), background var(--t-fast), color var(--t-fast);
  white-space: nowrap;
}

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

.btn-primary:hover,
.btn-primary:focus-visible {
  background: transparent;
  color: var(--color-accent);
}

.btn-ghost {
  background: transparent;
  color: var(--color-white);
  border-color: rgba(255, 255, 255, 0.35);
}

.btn-ghost:hover,
.btn-ghost:focus-visible {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.btn-paper {
  background: var(--color-paper);
  color: var(--color-ink);
  border-color: var(--color-paper);
}

.btn-paper:hover,
.btn-paper:focus-visible {
  background: transparent;
  color: var(--color-paper);
}

.paper-card {
  background: var(--color-paper);
  color: var(--color-ink);
  border: 1px solid var(--color-gray-light);
  border-radius: var(--radius);
  padding: 32px;
  position: relative;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.12);
}

.paper-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 36px;
  height: 3px;
  background: var(--color-gold);
}

.paper-card h2,
.paper-card h3 {
  color: var(--color-ink);
  margin-bottom: 14px;
}

.paper-card p {
  color: var(--color-gray);
}

.data-row {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 12px 0;
  border-bottom: 1px solid var(--color-border);
}

.data-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-soft);
  min-width: 88px;
  flex-shrink: 0;
  letter-spacing: 0.06em;
}

.data-value {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--color-white);
}

.figure {
  position: relative;
  background: var(--color-primary-deep);
  border: 1px solid rgba(255, 255, 255, 0.1);
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border-radius: var(--radius);
}

.figure-placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.35);
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.figure-fill {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.text-accent { color: var(--color-accent); }
.text-gold { color: var(--color-gold); }
.text-muted { color: var(--color-soft); }
.text-center { text-align: center; }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.mb-4 { margin-bottom: 32px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mt-4 { margin-top: 32px; }

@media (max-width: 1023px) {
  .site-header {
    top: 0;
    right: 0;
    bottom: auto;
    width: 100%;
    height: var(--header-height-mobile);
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    padding: 0 16px;
    border-right: none;
    border-bottom: 1px solid var(--color-border);
    background:
      linear-gradient(135deg, rgba(57, 255, 20, 0.03) 0%, transparent 50%),
      var(--color-primary);
  }

  .site-header:hover,
  .site-header:focus-within {
    width: 100%;
  }

  .header-brand {
    padding: 0;
    justify-content: flex-start;
    flex: 0 1 auto;
    min-width: 0;
  }

  .brand-link {
    padding: 0;
    min-height: 0;
    gap: 10px;
  }

  .brand-mark {
    width: 36px;
    height: 36px;
    font-size: 0.85rem;
    border-width: 1.5px;
  }

  .brand-copy,
  .site-header:hover .brand-copy,
  .site-header:focus-within .brand-copy {
    width: auto;
    opacity: 1;
    visibility: visible;
  }

  .brand-name {
    font-size: 1rem;
    white-space: nowrap;
  }

  .brand-tagline {
    display: none;
  }

  .site-nav {
    position: fixed;
    top: var(--header-height-mobile);
    left: 0;
    bottom: 0;
    width: 300px;
    background: var(--color-primary-deep);
    transform: translateX(-100%);
    transition: transform var(--t-slow);
    z-index: 1001;
    padding: 28px 0 0;
    box-shadow: 6px 0 24px rgba(0, 0, 0, 0.35);
    overflow-y: auto;
  }

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

  .site-nav .nav-link,
  .site-header:hover .nav-link,
  .site-header:focus-within .nav-link {
    justify-content: flex-start;
    padding-left: 24px;
    padding-right: 16px;
  }

  .site-nav .nav-label,
  .site-header:hover .nav-label,
  .site-header:focus-within .nav-label {
    width: auto;
    opacity: 1;
    visibility: visible;
  }

  .header-meta {
    margin-top: 24px;
    align-items: flex-start;
    padding: 0 24px 28px;
  }

  .header-live {
    font-size: 0.68rem;
  }

  .nav-toggle {
    display: flex;
    z-index: 1002;
  }

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

  .main-content {
    padding-top: var(--header-height-mobile);
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 40px 32px;
    padding: 48px var(--content-pad) 32px;
  }

  .footer-trust {
    max-width: 100%;
  }

  .section {
    padding: 52px 0;
  }

  .page-header {
    padding: 48px 0 32px;
  }
}

@media (max-width: 640px) {
  :root {
    --content-pad: 16px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }

  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .section {
    padding: 40px 0;
  }

  .site-nav {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .site-header,
  .site-nav,
  .brand-copy,
  .nav-label,
  .nav-link,
  .btn,
  .footer-link {
    transition: none;
  }
}