:root {
  color-scheme: dark;
  --bg: #020402;
  --bg-2: #071007;
  --panel: rgba(2, 14, 5, 0.9);
  --panel-strong: #031207;
  --green: #45ff7a;
  --green-soft: #9cffb8;
  --green-dim: #1f9f49;
  --amber: #ffd36a;
  --cyan: #6ee7ff;
  --red: #ff6b6b;
  --muted: #8aa58f;
  --line: rgba(69, 255, 122, 0.28);
  --shadow: rgba(69, 255, 122, 0.18);
  --topbar-height: 72px;
  --content-max: 1180px;
  --scroll-progress: 0;
}

@font-face {
  font-family: "DOSGothic";
  src: url("https://cdn.jsdelivr.net/gh/hurss/fonts@master/ttf/DOSGothic.ttf")
    format("truetype");
  font-display: swap;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  background:
    linear-gradient(180deg, rgba(3, 18, 7, 0.95), var(--bg) 22%, #010201 100%),
    repeating-linear-gradient(
      90deg,
      rgba(69, 255, 122, 0.04) 0,
      rgba(69, 255, 122, 0.04) 1px,
      transparent 1px,
      transparent 80px
    );
  color: var(--green-soft);
  font-family: "DOSGothic", "Courier New", Consolas, "Liberation Mono", monospace;
  font-size: 16px;
  line-height: 1.65;
  overflow-x: hidden;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  content: "";
  background:
    linear-gradient(90deg, transparent 0, rgba(69, 255, 122, 0.05) 50%, transparent 100%),
    repeating-linear-gradient(
      0deg,
      rgba(255, 255, 255, 0.03) 0,
      rgba(255, 255, 255, 0.03) 1px,
      transparent 1px,
      transparent 5px
    );
  transform: translateY(calc(var(--scroll-progress) * -20px));
}

a {
  color: inherit;
}

section {
  scroll-margin-top: calc(var(--topbar-height) + 20px);
}

button,
a {
  font: inherit;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 20;
  padding: 8px 12px;
  background: var(--amber);
  color: #111;
  transform: translateY(-140%);
}

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

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

.crt-overlay {
  position: fixed;
  inset: 0;
  z-index: 12;
  pointer-events: none;
  background:
    repeating-linear-gradient(
      0deg,
      rgba(255, 255, 255, 0.035) 0,
      rgba(255, 255, 255, 0.035) 1px,
      transparent 1px,
      transparent 4px
    );
  mix-blend-mode: screen;
  opacity: 0.16;
}

.topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 10;
  display: flex;
  min-height: var(--topbar-height);
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 16px 28px;
  border-bottom: 1px solid var(--line);
  background: rgba(1, 5, 2, 0.86);
  backdrop-filter: blur(10px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--green);
  text-decoration: none;
  text-shadow: 0 0 14px var(--shadow);
  white-space: nowrap;
}

.brand pre {
  margin: 0;
  color: var(--green);
  font-size: 6px;
  line-height: 0.96;
  white-space: pre;
}

.language-switcher {
  display: flex;
  align-items: center;
  gap: 8px;
}

.language-switcher button,
.copy-button,
.button {
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: rgba(2, 15, 6, 0.84);
  color: var(--green-soft);
  cursor: pointer;
  text-decoration: none;
  transition:
    border-color 150ms ease,
    color 150ms ease,
    background 150ms ease,
    box-shadow 150ms ease;
}

.language-switcher button {
  min-width: 48px;
  padding: 8px 10px;
}

.language-switcher button[aria-pressed="true"],
.button-primary,
.copy-button:hover,
.button:hover {
  border-color: var(--green);
  background: rgba(69, 255, 122, 0.12);
  color: var(--green);
  box-shadow: 0 0 18px var(--shadow);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 16px;
}

.button-secondary {
  color: var(--cyan);
}

.hero {
  position: relative;
  display: grid;
  min-height: 96vh;
  grid-template-columns: minmax(0, 0.95fr) minmax(360px, 1.05fr);
  align-items: center;
  gap: 44px;
  width: min(100% - 40px, var(--content-max));
  margin: 0 auto;
  padding: 120px 0 88px;
}

.hero-copy {
  transform: translateY(calc(var(--scroll-progress) * -14px));
}

.eyebrow {
  margin: 0 0 16px;
  color: var(--amber);
  font-size: 14px;
  line-height: 1.4;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  min-height: 224px;
  margin-bottom: 24px;
  color: var(--green);
  font-size: 64px;
  line-height: 1.08;
  font-weight: 700;
  letter-spacing: 0;
  text-shadow: 0 0 22px var(--shadow);
}

h2 {
  color: var(--green);
  font-size: 42px;
  line-height: 1.14;
  letter-spacing: 0;
}

h3 {
  color: var(--green);
  font-size: 22px;
  line-height: 1.25;
  letter-spacing: 0;
}

.hero-lede,
.chapter p,
.quick-copy p,
.component-item p {
  color: var(--green-soft);
  font-size: 18px;
}

.hero-lede {
  max-width: 620px;
  margin-bottom: 30px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.final-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-top: 22px;
}

.terminal-window {
  position: relative;
  border: 1px solid var(--line);
  border-radius: 6px;
  background:
    linear-gradient(180deg, rgba(69, 255, 122, 0.08), transparent 40%),
    var(--panel);
  box-shadow:
    0 0 0 1px rgba(69, 255, 122, 0.08) inset,
    0 20px 70px rgba(0, 0, 0, 0.38),
    0 0 36px var(--shadow);
}

.terminal-window::after {
  position: absolute;
  inset: 0;
  pointer-events: none;
  content: "";
  background: linear-gradient(120deg, transparent 0, rgba(255, 255, 255, 0.05) 48%, transparent 54%);
  opacity: 0.32;
  transform: translateX(calc(var(--scroll-progress) * 120px - 70px));
}

.window-bar {
  display: flex;
  min-height: 42px;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--line);
  color: var(--amber);
  font-size: 14px;
}

.window-controls {
  color: var(--muted);
  white-space: nowrap;
}

pre {
  margin: 0;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.boot-window {
  min-height: 440px;
  transform:
    translateY(calc(var(--scroll-progress) * 24px))
    rotateX(1deg)
    rotateZ(-1deg);
}

.boot-log {
  min-height: 392px;
  padding: 24px;
  color: var(--green-soft);
  font-size: 18px;
}

.cursor {
  display: inline-block;
  color: var(--green);
  animation: cursor-blink 900ms steps(2, start) infinite;
}

.scroll-cue {
  position: absolute;
  bottom: 28px;
  left: 0;
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--muted);
  font-size: 13px;
  text-transform: uppercase;
}

.scroll-cue-line {
  display: inline-block;
  width: 90px;
  height: 1px;
  background: var(--line);
}

.story {
  display: grid;
  grid-template-columns: minmax(340px, 0.9fr) minmax(0, 1.1fr);
  gap: 54px;
  width: min(100% - 40px, var(--content-max));
  margin: 0 auto;
  padding: 50px 0 120px;
}

.terminal-stage {
  position: sticky;
  top: 96px;
  min-height: 540px;
  align-self: start;
  transform: translateY(calc(var(--stage-y, 0) * 1px));
}

#terminal-output {
  min-height: 496px;
  padding: 24px;
  color: var(--green-soft);
  font-size: 17px;
}

.chapters {
  display: grid;
  gap: 14vh;
}

.chapter {
  display: flex;
  min-height: 82vh;
  flex-direction: column;
  justify-content: center;
  border-left: 1px solid rgba(69, 255, 122, 0.16);
  padding-left: 28px;
  opacity: 0.52;
  transform: translateY(30px);
  transition:
    opacity 280ms ease,
    transform 280ms ease,
    border-color 280ms ease;
}

.chapter.is-active {
  border-color: var(--green);
  opacity: 1;
  transform: translateY(0);
}

.component-grid,
.structure-view,
.quick-start,
.final-cta {
  width: min(100% - 40px, var(--content-max));
  margin: 0 auto;
}

.component-grid {
  padding: 90px 0 80px;
}

.structure-view {
  padding: 20px 0 110px;
}

.section-heading {
  max-width: 760px;
  margin-bottom: 34px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.component-item {
  min-height: 280px;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 22px;
  background: rgba(2, 12, 5, 0.72);
}

.item-code {
  display: inline-block;
  margin-bottom: 42px;
  color: var(--amber);
}

.structure-shell {
  overflow: hidden;
}

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

.tree-column {
  min-width: 0;
  padding: 24px;
}

.tree-column + .tree-column {
  border-left: 1px solid var(--line);
}

.tree-label {
  margin-bottom: 14px;
  color: var(--amber);
  font-size: 14px;
  text-transform: uppercase;
}

.tree-column pre {
  overflow-x: auto;
  white-space: pre;
  color: var(--green-soft);
  font-size: 16px;
  line-height: 1.55;
}

.quick-start {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(380px, 1.2fr);
  align-items: center;
  gap: 40px;
  padding: 90px 0 120px;
}

.command-panel pre {
  min-height: 146px;
  padding: 24px;
  color: var(--green);
  font-size: 18px;
}

.copy-button {
  margin: 0 24px 20px;
  padding: 10px 14px;
}

.copy-status {
  min-height: 28px;
  margin: 0 24px 24px;
  color: var(--amber);
  font-size: 14px;
}

.final-cta {
  min-height: 72vh;
  padding: 110px 0 130px;
  text-align: center;
}

.footer {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  padding: 26px 28px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

.font-credit {
  color: var(--amber);
  text-decoration: none;
}

.font-credit:hover {
  color: var(--green);
  text-decoration: underline;
}

@keyframes cursor-blink {
  0%,
  45% {
    opacity: 1;
  }
  46%,
  100% {
    opacity: 0;
  }
}

@media (max-width: 980px) {
  .hero,
  .story,
  .tree-columns,
  .quick-start {
    grid-template-columns: 1fr;
  }

  h1 {
    min-height: 160px;
    font-size: 46px;
  }

  h2 {
    font-size: 34px;
  }

  .terminal-stage {
    position: relative;
    top: auto;
    min-height: 420px;
  }

  #terminal-output {
    min-height: 376px;
  }

  .chapters {
    gap: 8vh;
  }

  .chapter {
    min-height: 56vh;
  }

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

  .tree-column + .tree-column {
    border-top: 1px solid var(--line);
    border-left: 0;
  }
}

@media (max-width: 640px) {
  body {
    font-size: 15px;
  }

  .topbar {
    position: sticky;
    flex-direction: column;
    align-items: flex-start;
    padding: 14px 18px;
  }

  .brand {
    max-width: 100%;
    overflow-x: auto;
    white-space: nowrap;
  }

  .brand pre {
    font-size: 4.8px;
  }

  .language-switcher {
    width: 100%;
    justify-content: space-between;
  }

  .language-switcher button {
    min-width: 0;
    flex: 1;
  }

  .hero,
  .story,
  .component-grid,
  .structure-view,
  .quick-start,
  .final-cta {
    width: min(100% - 28px, var(--content-max));
  }

  .hero {
    padding-top: 58px;
  }

  h1 {
    min-height: 150px;
    font-size: 34px;
  }

  h2 {
    font-size: 28px;
  }

  h3 {
    font-size: 20px;
  }

  .hero-lede,
  .chapter p,
  .quick-copy p,
  .component-item p {
    font-size: 16px;
  }

  .boot-window {
    min-height: 340px;
  }

  .boot-log,
  #terminal-output,
  .command-panel pre,
  .tree-column pre {
    padding: 18px;
    font-size: 15px;
  }

  .tree-column {
    padding: 0;
  }

  .boot-log {
    min-height: 292px;
  }

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

  .component-item {
    min-height: 220px;
  }

  .item-code {
    margin-bottom: 24px;
  }

  .footer {
    flex-direction: column;
    padding: 22px 18px;
  }
}

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

  .hero-copy,
  .boot-window,
  .terminal-stage,
  .terminal-window::after,
  body::before {
    transform: none !important;
  }
}