:root {
  --bg-ink: #0A0D16;
  --surface-code: #101724;
  --line-grid: #1E2738;
  --text-primary: #F0F4FA;
  --text-secondary: #A6B0C1;
  --data-green: #C7FF43;
  --tech-blue: #2E7DFF;
  --hot-orange: #FF8A1E;
  --font-body: "Inter", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "Sarasa Mono SC", "Roboto Mono", SFMono-Regular, Consolas, monospace;
  --header-h: 72px;
  --max-w: 1240px;
  --gutter: 24px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-color: var(--bg-ink);
  background-image:
    linear-gradient(var(--line-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-grid) 1px, transparent 1px);
  background-size: 32px 32px;
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  word-break: break-word;
}

main {
  display: block;
}

p {
  margin: 0 0 1em;
}

a {
  color: var(--tech-blue);
  text-decoration: underline;
  text-underline-offset: 3px;
}

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

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

::selection {
  background: var(--data-green);
  color: var(--bg-ink);
}

:focus-visible {
  outline: 2px solid var(--data-green);
  outline-offset: 3px;
}

[id] {
  scroll-margin-top: calc(var(--header-h) + 16px);
}

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 2000;
  background: var(--bg-ink);
  border: 1px solid var(--data-green);
  color: var(--data-green);
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  padding: 10px 16px;
  text-decoration: none;
  transform: translateY(-200%);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  background: rgba(10, 13, 22, 0.9);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line-grid);
}

.progress-track {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--line-grid);
  pointer-events: none;
}

.progress-fill {
  display: block;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, var(--data-green), var(--tech-blue));
  transform: scaleX(0);
  transform-origin: left center;
  will-change: transform;
}

.nav-shell {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: var(--header-h);
  width: min(var(--max-w), calc(100% - 48px));
  margin: 0 auto;
}

.brand-col {
  display: flex;
  align-items: center;
  gap: 18px;
  min-width: 0;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 22px;
  letter-spacing: 0.02em;
  color: var(--text-primary);
  text-decoration: none;
  white-space: nowrap;
}

.brand-mark:hover {
  color: var(--data-green);
}

.brand-mark__dot {
  width: 8px;
  height: 8px;
  flex: 0 0 auto;
  background: var(--data-green);
  box-shadow: 0 0 12px rgba(199, 255, 67, 0.7);
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--line-grid);
  border-radius: 999px;
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  padding: 5px 12px;
  white-space: nowrap;
}

.status-pill__pulse {
  width: 6px;
  height: 6px;
  flex: 0 0 auto;
  border-radius: 999px;
  background: var(--data-green);
  animation: status-breathe 2.4s ease-in-out infinite;
}

@keyframes status-breathe {
  0%, 100% {
    box-shadow: 0 0 0 0 rgba(199, 255, 67, 0.55);
  }
  50% {
    box-shadow: 0 0 0 7px rgba(199, 255, 67, 0);
  }
}

.site-nav {
  margin-left: auto;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: clamp(18px, 2.4vw, 34px);
  list-style: none;
}

.nav-link {
  position: relative;
  display: inline-block;
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-decoration: none;
  padding: 8px 0;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background: var(--data-green);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.2s ease;
}

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

.nav-link:hover::after {
  transform: scaleX(1);
}

.nav-link[aria-current="page"] {
  color: var(--data-green);
}

.nav-link[aria-current="page"]::after {
  transform: scaleX(1);
}

.nav-toggle {
  display: none;
}

.rail-nav {
  position: fixed;
  top: 50%;
  left: 20px;
  z-index: 80;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  pointer-events: none;
}

.rail-nav__line {
  width: 1px;
  height: 96px;
  background: linear-gradient(180deg, var(--data-green), var(--line-grid));
}

.rail-nav__index {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.22em;
  color: var(--data-green);
  writing-mode: vertical-rl;
  text-orientation: mixed;
}

.site-main {
  flex: 1 0 auto;
  padding-top: calc(var(--header-h) + 48px);
}

.container {
  width: min(var(--max-w), calc(100% - 48px));
  margin-left: auto;
  margin-right: auto;
}

.page-section {
  padding-block: clamp(64px, 10vw, 112px);
}

.page-section + .page-section {
  border-top: 1px solid var(--line-grid);
}

.chapter {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 20px;
}

.chapter__no {
  display: grid;
  place-items: center;
  width: 52px;
  height: 52px;
  flex: 0 0 auto;
  background: var(--surface-code);
  border: 1px solid var(--line-grid);
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 14px;
  letter-spacing: 0.08em;
  color: var(--data-green);
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 12px 100%, 0 calc(100% - 12px));
}

.chapter__label {
  align-self: stretch;
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  writing-mode: vertical-rl;
  padding-block: 6px;
}

.section-heading {
  max-width: 15em;
  margin: 0 0 36px;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: clamp(36px, 6vw, 72px);
  line-height: 0.98;
  letter-spacing: -0.04em;
  color: var(--text-primary);
}

.eyebrow {
  display: block;
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--data-green);
}

.content-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.55fr) minmax(0, 1.45fr);
  gap: 32px;
  align-items: start;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}

.card {
  position: relative;
  background: var(--surface-code);
  border: 1px solid var(--line-grid);
  padding: 26px;
  transition: border-color 0.2s ease, background 0.2s ease, transform 0.2s ease;
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 0 100%);
}

.card:hover {
  border-color: var(--tech-blue);
  background: #131B2C;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border: 1px solid var(--line-grid);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  background: var(--bg-ink);
  color: var(--text-secondary);
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 0 100%);
}

.badge--green {
  border-color: rgba(199, 255, 67, 0.45);
  color: var(--data-green);
}

.badge--blue {
  border-color: rgba(46, 125, 255, 0.45);
  color: var(--tech-blue);
}

.badge--orange {
  border-color: rgba(255, 138, 30, 0.5);
  color: var(--hot-orange);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 20px;
  border: 1px solid transparent;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-decoration: none;
  cursor: pointer;
  background: transparent;
  transition: border-color 0.2s ease, background 0.2s ease, color 0.2s ease, transform 0.2s ease;
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 12px 100%, 0 calc(100% - 12px));
}

.btn--primary {
  background: var(--hot-orange);
  color: var(--bg-ink);
}

.btn--primary:hover {
  background: #FF9E4D;
  color: var(--bg-ink);
  transform: translateY(-2px);
}

.btn--ghost {
  border-color: var(--data-green);
  color: var(--data-green);
}

.btn--ghost:hover {
  background: rgba(199, 255, 67, 0.1);
  color: var(--data-green);
  transform: translateY(-2px);
}

.metric {
  background: var(--surface-code);
  border: 1px solid var(--line-grid);
  padding: 22px 24px;
  border-left: 3px solid var(--data-green);
}

.metric__value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(40px, 6vw, 72px);
  font-weight: 800;
  line-height: 1;
  color: var(--data-green);
  font-variant-numeric: tabular-nums;
}

.metric__label {
  display: block;
  margin-top: 8px;
  color: var(--text-secondary);
  font-size: 14px;
  letter-spacing: 0.06em;
}

.image-frame {
  position: relative;
  overflow: hidden;
  min-height: 180px;
  background: var(--surface-code);
  border: 1px solid var(--line-grid);
}

.image-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(135deg, transparent calc(50% - 1px), var(--line-grid) 50%, transparent calc(50% + 1px)),
    repeating-linear-gradient(0deg, transparent 0 20px, rgba(30, 39, 56, 0.5) 20px 21px),
    repeating-linear-gradient(90deg, transparent 0 20px, rgba(30, 39, 56, 0.5) 20px 21px);
  opacity: 0.85;
}

.image-frame--16-9 {
  aspect-ratio: 16 / 9;
}

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

.image-frame__label {
  position: absolute;
  left: 14px;
  bottom: 14px;
  z-index: 1;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--text-primary);
  background: rgba(10, 13, 22, 0.82);
  border: 1px solid var(--line-grid);
  padding: 4px 10px;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0 0 28px;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 13px;
}

.breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--text-secondary);
}

.breadcrumb__item a {
  color: var(--tech-blue);
  text-decoration: none;
}

.breadcrumb__item a:hover {
  color: var(--data-green);
}

.breadcrumb__sep {
  color: var(--line-grid);
}

.is-fade-switch {
  opacity: 1;
  transition: opacity 0.2s ease;
}

.is-fade-switch.is-switching {
  opacity: 0;
}

html.js .reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

html.js .reveal.is-visible {
  opacity: 1;
  transform: none;
}

.site-footer {
  flex-shrink: 0;
  position: relative;
  border-top: 2px solid var(--data-green);
  background-color: #0B0F19;
  background-image:
    linear-gradient(var(--line-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-grid) 1px, transparent 1px);
  background-size: 28px 28px;
}

.foot-inner {
  width: min(var(--max-w), calc(100% - 48px));
  margin-left: auto;
  margin-right: auto;
  padding-block: 64px 28px;
}

.foot-copy {
  display: grid;
  grid-template-columns: 1.2fr 1.4fr 1fr;
  gap: 40px;
  align-items: start;
}

.foot-brand__name {
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: 0.02em;
}

.foot-slogan {
  margin-top: 8px;
  color: var(--text-secondary);
  font-size: 14px;
  letter-spacing: 0.06em;
}

.foot-links {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px 24px;
}

.foot-link {
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 14px;
  text-decoration: none;
  transition: color 0.2s ease;
}

.foot-link:hover {
  color: var(--data-green);
}

.foot-note {
  color: var(--text-secondary);
  font-size: 14px;
}

.foot-note p {
  margin-bottom: 6px;
}

.foot-note__icp {
  margin-top: 12px;
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
}

.foot-meta {
  margin-top: 48px;
  padding-top: 20px;
  border-top: 1px solid var(--line-grid);
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
}

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

  .grid-3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .foot-copy {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 900px) {
  .nav-toggle {
    display: flex;
    align-items: center;
    gap: 8px;
    background: transparent;
    border: 1px solid var(--line-grid);
    border-radius: 2px;
    padding: 10px 12px;
    cursor: pointer;
    color: var(--text-primary);
  }

  .nav-toggle__bar {
    width: 16px;
    height: 2px;
    background: var(--data-green);
  }

  .nav-toggle__label {
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: 0.1em;
    color: var(--text-primary);
  }

  .site-nav {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    right: 0;
    margin-left: 0;
    background: #0B0F19;
    border: 1px solid var(--line-grid);
    box-shadow: 0 16px 32px rgba(0, 0, 0, 0.45);
    padding: 8px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    pointer-events: none;
    transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s ease;
  }

  .site-nav[data-open] {
    opacity: 1;
    visibility: visible;
    transform: none;
    pointer-events: auto;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .nav-link {
    display: block;
    width: 100%;
    padding: 14px 12px;
    border-bottom: 1px solid var(--line-grid);
  }

  .nav-link::after {
    display: none;
  }

  .status-pill {
    display: none;
  }

  .content-grid {
    grid-template-columns: 1fr;
  }

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

  .foot-copy {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 560px) {
  .nav-shell,
  .container,
  .foot-inner {
    width: min(100% - 32px, var(--max-w));
  }

  .brand-mark {
    font-size: 19px;
  }

  .nav-toggle {
    padding: 8px 10px;
  }

  .foot-links {
    grid-template-columns: 1fr;
  }

  .foot-inner {
    padding-top: 48px;
  }
}

@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;
  }

  html.js .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .status-pill__pulse {
    animation: none;
  }
}