:root {
  color-scheme: light;
  --bg: #f7f7f4;
  --surface: #ffffff;
  --surface-soft: #eef3f1;
  --ink: #171a1f;
  --muted: #5d6673;
  --line: #d9ded9;
  --accent: #0f766e;
  --accent-strong: #115e59;
  --code: #151a1f;
  --code-text: #e5f8f5;
  --shadow: 0 18px 45px rgba(27, 33, 38, 0.08);
  --blink-duration: 3s;
  --moon-wallpaper-image: linear-gradient(120deg, #0b1020, #16213a 34%, #1e2d4f 62%, #0f172a);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

:root[data-theme="night"] {
  color-scheme: light;
  --bg: #f6f0d8;
  --surface: #fff8df;
  --surface-soft: #efe5bf;
  --ink: #27200f;
  --muted: #6f6240;
  --line: #d9cca2;
  --accent: #9a6b16;
  --accent-strong: #765111;
  --code: #211b12;
  --code-text: #fff2bd;
  --shadow: 0 18px 45px rgba(80, 56, 8, 0.12);
}

:root[data-theme="electricity"] {
  color-scheme: dark;
  --bg: #050607;
  --surface: #0b0f12;
  --surface-soft: #12181d;
  --ink: #e7f8ef;
  --muted: #8aa09a;
  --line: #263238;
  --accent: #36d399;
  --accent-strong: #5eead4;
  --code: #000000;
  --code-text: #8fffd5;
  --shadow: 0 18px 45px rgba(0, 0, 0, 0.46);
}

:root[data-theme="moon"] {
  color-scheme: dark;
  --bg: #101624;
  --surface: #161f31;
  --surface-soft: #202b40;
  --ink: #ecf2ff;
  --muted: #a8b4cc;
  --line: #334158;
  --accent: #8ab4ff;
  --accent-strong: #b9cdfc;
  --code: #080d17;
  --code-text: #dbeafe;
  --shadow: 0 18px 45px rgba(2, 6, 23, 0.42);
  --moon-bg-x: 78%;
  --moon-bg-y: 18%;
  --moon-bg-hotspot-size: 168px;
  --moon-core-radius: 56px;
  --moon-glow-radius: 76px;
  --moon-fade-radius: 82px;
  --moon-core: rgba(248, 250, 252, 0.88);
  --moon-glow: rgba(191, 219, 254, 0.42);
  --moon-atmosphere-a: rgba(96, 165, 250, 0.16);
  --moon-atmosphere-b: rgba(186, 230, 253, 0.12);
  --moon-panel-tint: rgba(22, 31, 49, 0.58);
  --moon-soft-tint: rgba(32, 43, 64, 0.62);
  --moon-border-tint: rgba(191, 219, 254, 0.26);
}

:root[data-theme="electricity"] .search-box,
:root[data-theme="moon"] .search-box {
  background: var(--surface-soft);
}

:root[data-theme="electricity"] .search-box:focus-within,
:root[data-theme="moon"] .search-box:focus-within {
  background: var(--surface);
}

:root[data-theme="electricity"] input,
:root[data-theme="moon"] input {
  color: var(--ink);
}

:root[data-theme="electricity"] input::placeholder,
:root[data-theme="moon"] input::placeholder {
  color: var(--muted);
  opacity: 1;
}

:root[data-theme="electricity"] .search-box button,
:root[data-theme="moon"] .search-box button {
  color: var(--accent-strong);
}

:root[data-theme="electricity"] .command-card,
:root[data-theme="electricity"] .tool-card,
:root[data-theme="electricity"] .os-card,
:root[data-theme="electricity"] .virtual-lab-card,
:root[data-theme="electricity"] .language-card,
:root[data-theme="electricity"] .about-panels article,
:root[data-theme="electricity"] .related a,
:root[data-theme="electricity"] .empty-state,
:root[data-theme="moon"] .command-card,
:root[data-theme="moon"] .tool-card,
:root[data-theme="moon"] .os-card,
:root[data-theme="moon"] .virtual-lab-card,
:root[data-theme="moon"] .language-card,
:root[data-theme="moon"] .about-panels article,
:root[data-theme="moon"] .related a,
:root[data-theme="moon"] .empty-state {
  background: var(--surface);
}

:root[data-theme="electricity"] .command-summary,
:root[data-theme="electricity"] .section-heading p,
:root[data-theme="electricity"] .hero p,
:root[data-theme="electricity"] .page-intro p,
:root[data-theme="electricity"] .detail-header p,
:root[data-theme="electricity"] .prose p,
:root[data-theme="electricity"] .prose li,
:root[data-theme="electricity"] .tool-card p,
:root[data-theme="electricity"] .os-card p,
:root[data-theme="electricity"] .virtual-lab-card p,
:root[data-theme="electricity"] .language-card p,
:root[data-theme="moon"] .command-summary,
:root[data-theme="moon"] .section-heading p,
:root[data-theme="moon"] .hero p,
:root[data-theme="moon"] .page-intro p,
:root[data-theme="moon"] .detail-header p,
:root[data-theme="moon"] .prose p,
:root[data-theme="moon"] .prose li,
:root[data-theme="moon"] .tool-card p,
:root[data-theme="moon"] .os-card p,
:root[data-theme="moon"] .virtual-lab-card p,
:root[data-theme="moon"] .language-card p {
  color: var(--muted);
}

:root[data-theme="electricity"] .prose code,
:root[data-theme="electricity"] .about-panels code,
:root[data-theme="moon"] .prose code,
:root[data-theme="moon"] .about-panels code {
  color: var(--code-text);
  background: var(--code);
}

:root[data-theme="electricity"] .ethics-note,
:root[data-theme="moon"] .ethics-note {
  color: var(--muted);
  background: var(--surface);
}

:root[data-theme="moon"] .site-header,
:root[data-theme="moon"] .search-panel,
:root[data-theme="moon"] .command-card,
:root[data-theme="moon"] .tool-card,
:root[data-theme="moon"] .os-card,
:root[data-theme="moon"] .virtual-lab-card,
:root[data-theme="moon"] .language-card,
:root[data-theme="moon"] .about-panels article,
:root[data-theme="moon"] .related a,
:root[data-theme="moon"] .empty-state,
:root[data-theme="moon"] .theme-menu,
:root[data-theme="moon"] .penguin-tip,
:root[data-theme="moon"] .penguin-clock,
:root[data-theme="moon"] .ethics-note {
  border-color: var(--moon-border-tint);
  background: var(--moon-panel-tint);
  box-shadow: 0 18px 45px rgba(2, 6, 23, 0.28);
  backdrop-filter: blur(18px) saturate(1.18);
}

:root[data-theme="moon"] .search-box,
:root[data-theme="moon"] .tool-categories a,
:root[data-theme="moon"] .compact-list a,
:root[data-theme="moon"] .tag-row span,
:root[data-theme="moon"] .theme-menu button {
  border-color: var(--moon-border-tint);
  background: var(--moon-soft-tint);
  backdrop-filter: blur(12px);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  min-width: 320px;
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.5;
}

:root[data-theme="moon"] body {
  background:
    radial-gradient(circle at var(--moon-bg-x) var(--moon-bg-y), var(--moon-core) 0 var(--moon-core-radius), var(--moon-glow) calc(var(--moon-core-radius) + 1px) var(--moon-glow-radius), transparent var(--moon-fade-radius)),
    radial-gradient(circle at 12% 20%, rgba(255, 255, 255, 0.72) 0 1px, transparent 2px),
    radial-gradient(circle at 22% 68%, rgba(255, 255, 255, 0.55) 0 1px, transparent 2px),
    radial-gradient(circle at 48% 30%, rgba(255, 255, 255, 0.62) 0 1px, transparent 2px),
    radial-gradient(circle at 70% 72%, rgba(255, 255, 255, 0.48) 0 1px, transparent 2px),
    linear-gradient(rgba(8, 13, 23, 0.32), rgba(8, 13, 23, 0.56)),
    var(--moon-wallpaper-image);
  background-size:
    100% 100%,
    220px 220px,
    260px 260px,
    300px 300px,
    340px 340px,
    100% 100%,
    cover;
  background-attachment: fixed;
  animation: moon-wallpaper-slide 28s ease-in-out infinite alternate;
}

@keyframes moon-wallpaper-slide {
  0% {
    background-position:
      0 0,
      0 0,
      40px 20px,
      80px 10px,
      120px 60px,
      0 0,
      50% 50%;
  }

  100% {
    background-position:
      0 0,
      60px 26px,
      -30px 48px,
      120px -20px,
      40px 80px,
      0 0,
      54% 50%;
  }
}

:root[data-theme="moon"] body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(160deg, rgba(15, 23, 42, 0.2), rgba(30, 41, 59, 0.44)),
    radial-gradient(circle at 18% 82%, var(--moon-atmosphere-a), transparent 28%),
    radial-gradient(circle at 86% 68%, var(--moon-atmosphere-b), transparent 30%);
  content: "";
  pointer-events: none;
}

.moon-wallpaper-hotspot {
  display: none;
}

:root[data-theme="moon"] .moon-wallpaper-hotspot {
  position: fixed;
  top: calc(var(--moon-bg-y) - (var(--moon-bg-hotspot-size) / 2));
  left: calc(var(--moon-bg-x) - (var(--moon-bg-hotspot-size) / 2));
  z-index: 2;
  display: block;
  width: var(--moon-bg-hotspot-size);
  height: var(--moon-bg-hotspot-size);
  border: 0;
  border-radius: 50%;
  background: transparent;
  cursor: pointer;
}

:root[data-theme="moon"] .moon-wallpaper-hotspot:hover,
:root[data-theme="moon"] .moon-wallpaper-hotspot:focus-visible {
  outline: 2px solid var(--accent-strong);
  outline-offset: -18px;
}

@media (max-width: 680px) {
  :root[data-theme="moon"] {
    --moon-bg-x: 82%;
    --moon-bg-y: 16%;
    --moon-bg-hotspot-size: 136px;
    --moon-core-radius: 46px;
    --moon-glow-radius: 64px;
    --moon-fade-radius: 70px;
  }
}

a {
  color: inherit;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 68px;
  padding: 14px clamp(16px, 4vw, 48px);
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-weight: 800;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border-radius: 8px;
  color: #5eead4;
  background: #151a1f;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.penguin-theme {
  position: fixed;
  right: clamp(12px, 2vw, 24px);
  bottom: clamp(14px, 2.5vw, 26px);
  z-index: 30;
  width: 96px;
  height: 164px;
}

.penguin {
  position: absolute;
  right: 13px;
  bottom: 0;
  width: 70px;
  height: 100px;
  pointer-events: none;
}

.penguin-head,
.penguin-body {
  position: absolute;
  left: 50%;
  background: #14181f;
  transform: translateX(-50%);
}

.penguin-head {
  top: 0;
  width: 50px;
  height: 46px;
  border-radius: 50% 50% 44% 44%;
}

.penguin-body {
  top: 34px;
  width: 62px;
  height: 62px;
  border-radius: 48% 48% 42% 42%;
}

.penguin-face,
.penguin-belly {
  position: absolute;
  left: 50%;
  background: #f8fafc;
  transform: translateX(-50%);
}

.penguin-face {
  top: 12px;
  width: 34px;
  height: 26px;
  border-radius: 50%;
}

.penguin-belly {
  top: 48px;
  width: 38px;
  height: 42px;
  border-radius: 50% 50% 44% 44%;
}

.penguin-eye,
.penguin-beak,
.penguin-foot {
  position: absolute;
  z-index: 2;
}

.penguin-eye {
  top: 21px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: #111827;
}

.penguin-eye.left {
  left: 25px;
}

.penguin-eye.right {
  right: 25px;
}

.penguin-beak {
  top: 27px;
  left: 50%;
  width: 14px;
  height: 8px;
  clip-path: polygon(0 0, 100% 0, 50% 100%);
  background: #f59e0b;
  transform: translateX(-50%);
}

.penguin-foot {
  bottom: 0;
  width: 23px;
  height: 10px;
  border-radius: 70% 70% 30% 30%;
  background: #f59e0b;
}

.penguin-foot.left {
  left: 11px;
  transform: rotate(-7deg);
}

.penguin-foot.right {
  right: 11px;
  transform: rotate(7deg);
}

.penguin-device {
  position: absolute;
  right: 4px;
  bottom: 32px;
  z-index: 3;
  display: grid;
  gap: 5px;
  width: 48px;
  height: 42px;
  place-items: center;
  border: 2px solid #334155;
  border-radius: 8px;
  background: linear-gradient(160deg, #1f2937, #020617);
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.28);
  cursor: pointer;
}

.penguin-device:hover,
.penguin-device:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--accent) 28%, transparent);
}

.device-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent-strong);
}

.device-line {
  width: 24px;
  height: 3px;
  border-radius: 999px;
  background: #cbd5e1;
}

.theme-menu {
  position: absolute;
  right: 74px;
  bottom: 30px;
  display: grid;
  gap: 6px;
  width: 178px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.theme-menu[hidden],
.penguin-tip[hidden] {
  display: none;
}

.theme-menu button {
  min-height: 36px;
  border: 1px solid var(--line);
  border-radius: 7px;
  padding: 7px 9px;
  color: var(--ink);
  background: var(--surface-soft);
  font: inherit;
  font-size: 0.88rem;
  font-weight: 800;
  text-align: left;
  cursor: pointer;
}

.theme-menu button:hover,
.theme-menu button:focus-visible {
  border-color: var(--accent);
  outline: 0;
}

.penguin-tip {
  position: absolute;
  right: 78px;
  bottom: 82px;
  width: min(230px, calc(100vw - 132px));
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px 12px;
  color: var(--ink);
  background: var(--surface);
  box-shadow: var(--shadow);
  font-size: 0.86rem;
  font-weight: 700;
  line-height: 1.28;
}

.penguin-tip::after {
  position: absolute;
  right: -8px;
  bottom: 16px;
  width: 14px;
  height: 14px;
  border-top: 1px solid var(--line);
  border-right: 1px solid var(--line);
  background: var(--surface);
  content: "";
  transform: rotate(45deg);
}

.penguin-clock {
  position: absolute;
  right: 78px;
  bottom: 18px;
  min-width: 86px;
  border: 1px solid var(--line);
  border-radius: 7px;
  padding: 4px 6px;
  color: var(--accent-strong);
  background: var(--surface);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.76rem;
  font-weight: 900;
  text-align: center;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 6px;
}

.site-nav a {
  min-height: 38px;
  padding: 8px 12px;
  border-radius: 7px;
  color: var(--muted);
  font-weight: 700;
  text-decoration: none;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--ink);
  background: var(--surface-soft);
}

main {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(320px, 0.95fr);
  gap: clamp(28px, 6vw, 72px);
  align-items: center;
  min-height: calc(100vh - 170px);
  padding: clamp(48px, 8vw, 92px) 0 40px;
}

.hero h1,
.page-intro h1,
.detail-header h1 {
  margin: 0;
  max-width: 880px;
  font-size: clamp(2.4rem, 5vw, 5.3rem);
  line-height: 0.96;
  letter-spacing: 0;
}

.hero p,
.page-intro p,
.detail-header p {
  max-width: 680px;
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 1.12rem;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--accent-strong);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

.search-panel,
.inline-search {
  display: grid;
  gap: 10px;
}

.search-panel {
  padding: clamp(18px, 3vw, 26px);
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

label {
  color: var(--ink);
  font-size: 0.9rem;
  font-weight: 800;
}

.search-box {
  display: flex;
  align-items: stretch;
  min-height: 58px;
  border: 2px solid transparent;
  border-radius: 8px;
  background: var(--surface-soft);
}

.search-box:focus-within {
  border-color: var(--accent);
  background: var(--surface);
}

.search-box input {
  width: 100%;
  min-width: 0;
  border: 0;
  padding: 0 16px;
  color: var(--ink);
  background: transparent;
  font: inherit;
  font-size: 1rem;
  outline: 0;
}

.search-box button {
  flex: 0 0 auto;
  border: 0;
  border-left: 1px solid var(--line);
  padding: 0 16px;
  color: var(--accent-strong);
  background: transparent;
  font: inherit;
  font-weight: 800;
  cursor: pointer;
}

.results-section,
.all-section {
  padding: 28px 0 56px;
}

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
}

.section-heading h2 {
  margin: 0;
  font-size: clamp(1.35rem, 2vw, 1.8rem);
}

.section-heading p,
.section-heading a {
  margin: 0;
  color: var(--muted);
  font-weight: 700;
}

.command-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 14px;
}

.command-card {
  display: grid;
  gap: 8px;
  min-height: 172px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  text-decoration: none;
  opacity: 0;
  transform: translateY(10px);
  animation: card-enter 420ms ease forwards;
  transition:
    border-color 160ms ease,
    box-shadow 160ms ease,
    transform 160ms ease,
    background-color 160ms ease;
}

.command-card:hover,
.command-card:focus-visible {
  border-color: rgba(15, 118, 110, 0.55);
  box-shadow: 0 12px 28px rgba(15, 118, 110, 0.12);
  outline: 0;
  transform: translateY(-4px);
}

@keyframes card-enter {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.command-card.is-exact-match {
  border-color: #16a34a;
  background: #ecfdf3;
  animation:
    card-enter 220ms ease forwards,
    match-blink var(--blink-duration) ease-in-out 3;
}

.command-card.is-related-match {
  border-color: #dc143c;
  background: #fff1f2;
  animation:
    card-enter 220ms ease forwards,
    related-blink var(--blink-duration) ease-in-out 3;
}

@keyframes match-blink {
  0% {
    border-color: var(--line);
    background: var(--surface);
    box-shadow: none;
  }

  50% {
    border-color: #16a34a;
    background: #ecfdf3;
    box-shadow: 0 0 0 5px rgba(22, 163, 74, 0.22);
  }

  100% {
    border-color: #16a34a;
    background: #ecfdf3;
    box-shadow: none;
  }
}

:root[data-theme="electricity"] .command-card.is-exact-match,
:root[data-theme="moon"] .command-card.is-exact-match {
  animation:
    card-enter 220ms ease forwards,
    match-blink-dark var(--blink-duration) ease-in-out 3;
}

@keyframes match-blink-dark {
  0% {
    border-color: var(--line);
    background: var(--surface);
    box-shadow: none;
  }

  50% {
    border-color: #22c55e;
    background: rgba(34, 197, 94, 0.18);
    box-shadow: 0 0 0 5px rgba(34, 197, 94, 0.2);
  }

  100% {
    border-color: #22c55e;
    background: rgba(34, 197, 94, 0.18);
    box-shadow: none;
  }
}

@keyframes related-blink {
  0% {
    border-color: var(--line);
    background: var(--surface);
    box-shadow: none;
  }

  50% {
    border-color: #dc143c;
    background: #fff1f2;
    box-shadow: 0 0 0 5px rgba(220, 20, 60, 0.2);
  }

  100% {
    border-color: #dc143c;
    background: #fff1f2;
    box-shadow: none;
  }
}

:root[data-theme="electricity"] .command-card.is-related-match,
:root[data-theme="moon"] .command-card.is-related-match {
  animation:
    card-enter 220ms ease forwards,
    related-blink-dark var(--blink-duration) ease-in-out 3;
}

@keyframes related-blink-dark {
  0% {
    border-color: var(--line);
    background: var(--surface);
    box-shadow: none;
  }

  50% {
    border-color: #fb7185;
    background: rgba(251, 113, 133, 0.18);
    box-shadow: 0 0 0 5px rgba(251, 113, 133, 0.18);
  }

  100% {
    border-color: #fb7185;
    background: rgba(251, 113, 133, 0.18);
    box-shadow: none;
  }
}

.near-match-text {
  display: inline-block;
  border-radius: 5px;
  padding: 0 2px;
  color: #1d4ed8;
  background: #dbeafe;
  animation: near-text-blink var(--blink-duration) ease-in-out 3;
}

@keyframes near-text-blink {
  0%,
  100% {
    color: #1d4ed8;
    background: #dbeafe;
    box-shadow: none;
    transform: scale(1);
  }

  45% {
    color: #ffffff;
    background: #2563eb;
    box-shadow: 0 0 0 5px rgba(37, 99, 235, 0.2);
    transform: scale(1.08);
  }
}

:root[data-theme="electricity"] .near-match-text,
:root[data-theme="moon"] .near-match-text {
  color: #bfdbfe;
  background: rgba(37, 99, 235, 0.24);
  animation: near-text-blink-dark var(--blink-duration) ease-in-out 3;
}

@keyframes near-text-blink-dark {
  0%,
  100% {
    color: #bfdbfe;
    background: rgba(37, 99, 235, 0.24);
    box-shadow: none;
    transform: scale(1);
  }

  45% {
    color: #eff6ff;
    background: rgba(59, 130, 246, 0.62);
    box-shadow: 0 0 0 5px rgba(59, 130, 246, 0.18);
    transform: scale(1.08);
  }
}

.has-no-results .search-box {
  animation: no-results-blink var(--blink-duration) ease-in-out 3;
}

@keyframes no-results-blink {
  0%,
  100% {
    border-color: transparent;
    background: var(--surface-soft);
    box-shadow: none;
  }

  45% {
    border-color: #dc143c;
    background: #fff1f2;
    box-shadow: 0 0 0 4px rgba(220, 20, 60, 0.16);
  }
}

:root[data-theme="electricity"] .has-no-results .search-box,
:root[data-theme="moon"] .has-no-results .search-box {
  animation: no-results-blink-dark var(--blink-duration) ease-in-out 3;
}

@keyframes no-results-blink-dark {
  0%,
  100% {
    border-color: var(--line);
    background: var(--surface-soft);
    box-shadow: none;
  }

  45% {
    border-color: #fb7185;
    background: rgba(251, 113, 133, 0.16);
    box-shadow: 0 0 0 4px rgba(251, 113, 133, 0.18);
  }
}

@media (prefers-reduced-motion: reduce) {
  :root[data-theme="moon"] body {
    animation: none;
  }

  .command-card {
    opacity: 1;
    transform: none;
    animation: none;
    transition: none;
  }

  .command-card.is-exact-match {
    animation: none;
    border-color: #16a34a;
    background: #ecfdf3;
  }

  .command-card.is-related-match {
    animation: none;
    border-color: #dc143c;
    background: #fff1f2;
  }

  .near-match-text {
    animation: none;
    color: #1d4ed8;
    background: #dbeafe;
  }

  .has-no-results .search-box {
    animation: none;
    border-color: #dc143c;
    background: #fff1f2;
  }
}

.command-name {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 1.45rem;
  font-weight: 800;
}

.command-summary {
  color: var(--muted);
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-self: end;
}

.tag-row span {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 4px 8px;
  color: var(--muted);
  background: var(--surface-soft);
  font-size: 0.78rem;
  font-weight: 700;
}

.compact-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.compact-list a {
  border: 1px solid var(--line);
  border-radius: 7px;
  padding: 8px 11px;
  background: var(--surface);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-weight: 800;
  text-decoration: none;
}

.empty-state {
  border: 1px dashed #9aa5a1;
  border-radius: 8px;
  padding: 36px 20px;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.55);
  text-align: center;
}

.empty-state h2 {
  margin: 0 0 8px;
  color: var(--ink);
}

.empty-state p {
  margin: 0;
}

.page-shell,
.detail-shell {
  padding-top: clamp(36px, 6vw, 72px);
}

.page-intro {
  display: grid;
  gap: 24px;
  margin-bottom: 18px;
}

.detail-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: clamp(28px, 5vw, 56px);
}

.breadcrumb {
  grid-column: 1 / -1;
  display: flex;
  gap: 8px;
  color: var(--muted);
  font-size: 0.94rem;
  font-weight: 700;
}

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

.command-detail {
  min-width: 0;
}

.detail-header {
  padding-bottom: 28px;
  border-bottom: 1px solid var(--line);
}

.detail-header h1 {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.detail-header .tag-row {
  margin-top: 18px;
}

.prose {
  padding: 10px 0 48px;
}

.prose h2 {
  margin: 38px 0 12px;
  font-size: 1.45rem;
}

.prose p,
.prose li {
  color: #303842;
}

.prose code {
  border-radius: 5px;
  padding: 2px 5px;
  color: #063b36;
  background: #dff5ef;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.94em;
}

.prose pre {
  overflow: auto;
  border-radius: 8px;
  padding: 18px;
  background: var(--code);
}

.prose pre code {
  padding: 0;
  color: var(--code-text);
  background: transparent;
}

.about-shell,
.linux-tree-shell,
.tools-shell {
  width: min(1120px, calc(100% - 32px));
  padding: clamp(42px, 7vw, 78px) 0 72px;
}

.about-hero,
.linux-tree-shell .page-intro,
.tools-hero {
  display: grid;
  gap: 16px;
  max-width: 860px;
  margin-bottom: clamp(28px, 5vw, 46px);
}

.about-hero h1,
.tools-hero h1 {
  margin: 0;
  font-size: clamp(2.4rem, 5vw, 4.7rem);
  line-height: 0.98;
  letter-spacing: 0;
}

.about-hero p:not(.eyebrow),
.tools-hero p:not(.eyebrow) {
  margin: 0;
  max-width: 760px;
  color: var(--muted);
  font-size: 1.08rem;
}

.tree-visual-section {
  padding: 4px 0 40px;
}

.tree-search {
  display: grid;
  gap: 10px;
  max-width: 760px;
  margin: 0 0 22px;
}

.tree-search label {
  color: var(--ink);
  font-weight: 800;
}

.tree-search-status {
  min-height: 1.4em;
  margin: 0;
  color: var(--muted);
  font-size: 0.94rem;
  font-weight: 700;
}

.filesystem-tree {
  position: relative;
  overflow: hidden;
  min-height: 620px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.tree-scroll {
  position: relative;
  z-index: 1;
  overflow: auto;
  min-height: 620px;
  padding: clamp(18px, 4vw, 32px);
}

.linux-file-tree,
.linux-file-tree ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.linux-file-tree {
  min-width: 760px;
  position: relative;
}

.linux-file-tree ul {
  position: relative;
  margin-left: 28px;
  padding-left: 30px;
}

.linux-file-tree ul::before {
  position: absolute;
  top: 0;
  bottom: 18px;
  left: 0;
  width: 2px;
  background: color-mix(in srgb, var(--accent) 34%, var(--line));
  content: "";
}

.linux-file-tree li {
  position: relative;
  padding: 8px 0;
}

.linux-file-tree ul > li::before {
  position: absolute;
  top: 28px;
  left: -30px;
  width: 30px;
  height: 2px;
  background: color-mix(in srgb, var(--accent) 34%, var(--line));
  content: "";
}

.tree-node,
.tree-leaf {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 40px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 8px 11px;
  color: var(--ink);
  background: color-mix(in srgb, var(--surface-soft) 72%, transparent);
  font: inherit;
  text-align: left;
  cursor: pointer;
  transition:
    border-color 160ms ease,
    background-color 160ms ease,
    box-shadow 160ms ease,
    transform 160ms ease;
}

.tree-node:hover,
.tree-node:focus-visible,
.tree-leaf:hover,
.tree-leaf:focus-visible,
.tree-node.is-selected,
.tree-leaf.is-selected {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 14%, var(--surface));
  box-shadow: 0 10px 22px color-mix(in srgb, var(--accent) 14%, transparent);
  outline: 0;
}

.tree-node:hover,
.tree-node:focus-visible,
.tree-leaf:hover,
.tree-leaf:focus-visible {
  transform: translateX(2px);
}

.tree-node-root {
  min-width: 230px;
  border-color: color-mix(in srgb, var(--accent) 55%, var(--line));
  background: var(--surface-soft);
}

.tree-node-root code {
  font-size: 1.35rem;
}

.tree-node::before,
.tree-leaf::before {
  flex: 0 0 auto;
  width: 18px;
  height: 15px;
  border: 2px solid var(--accent);
  border-top-width: 5px;
  border-radius: 3px;
  background: color-mix(in srgb, var(--accent) 18%, transparent);
  content: "";
}

.tree-leaf::before {
  width: 14px;
  height: 18px;
  border-width: 2px;
  border-radius: 2px;
  background: transparent;
}

.tree-node small {
  color: var(--muted);
  font-weight: 700;
}

.tree-node code,
.tree-leaf code,
.tree-explainer code {
  color: var(--accent-strong);
  font-weight: 900;
}

.tree-info-panel {
  position: absolute;
  top: 24px;
  left: 24px;
  z-index: 4;
  width: min(430px, calc(100% - 48px));
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: clamp(22px, 4vw, 34px);
  background: var(--surface-soft);
  box-shadow: 0 24px 68px rgba(15, 23, 42, 0.22);
  transform: scale(1);
  transform-origin: center;
  animation: tree-panel-enter 180ms ease-out;
}

.tree-cable-layer {
  position: absolute;
  inset: 0;
  z-index: 3;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.tree-cable-layer[hidden] {
  display: none;
}

.tree-cable-layer path {
  fill: none;
  stroke: var(--accent);
  stroke-linecap: round;
  stroke-width: 3;
  filter: drop-shadow(0 2px 8px color-mix(in srgb, var(--accent) 35%, transparent));
}

.tree-info-close {
  position: absolute;
  top: 12px;
  right: 12px;
  border: 1px solid var(--line);
  border-radius: 7px;
  padding: 6px 8px;
  color: var(--muted);
  background: var(--surface);
  font: inherit;
  font-size: 0.78rem;
  font-weight: 800;
  cursor: pointer;
}

.tree-info-close:hover,
.tree-info-close:focus-visible {
  border-color: var(--accent);
  color: var(--ink);
  outline: 0;
}

.tree-info-panel h2 {
  margin: 0;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  overflow-wrap: anywhere;
}

.tree-info-panel p:not(.eyebrow) {
  margin: 12px 0 16px;
  color: var(--muted);
}

.tree-info-panel dl {
  display: grid;
  gap: 10px;
  margin: 0;
}

.tree-info-panel div {
  display: grid;
  gap: 3px;
  border-top: 1px solid var(--line);
  padding-top: 10px;
}

.tree-info-panel dt {
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 800;
  text-transform: uppercase;
}

.tree-info-panel dd {
  margin: 0;
  font-weight: 800;
}

.tree-info-panel[hidden] {
  display: none;
}

@keyframes tree-panel-enter {
  from {
    opacity: 0;
    transform: scale(0.94);
  }

  to {
    opacity: 1;
    transform: scale(1);
  }
}

.tree-explainer {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  padding: 10px 0 34px;
}

.tree-explainer h2 {
  margin: 0;
  font-size: clamp(1.35rem, 2.2vw, 2rem);
  line-height: 1.08;
}

.tree-explainer p {
  color: var(--muted);
}

.about-panels,
.tool-grid,
.os-grid,
.virtual-lab-grid,
.language-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 14px;
}

.about-panels article,
.tool-card,
.os-card,
.virtual-lab-card,
.language-card,
.ethics-note {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.about-panels article {
  padding: 20px;
}

.about-panels h2,
.tool-card h3,
.os-card h3,
.virtual-lab-card h3,
.language-card h3 {
  margin: 0 0 8px;
}

.about-panels p,
.tool-card p,
.os-card p,
.virtual-lab-card p,
.language-card p {
  margin: 0;
  color: var(--muted);
}

.about-panels code {
  border-radius: 5px;
  padding: 2px 5px;
  color: #063b36;
  background: #dff5ef;
}

.ethics-note {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  margin-bottom: 18px;
  padding: 14px 16px;
  color: #475569;
  background: #f8fafc;
}

.ethics-note strong {
  flex: 0 0 auto;
  color: var(--ink);
}

.tool-search {
  display: grid;
  gap: 10px;
  max-width: 760px;
  margin-bottom: 18px;
}

.tool-categories {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 32px;
}

.tool-categories a {
  border: 1px solid var(--line);
  border-radius: 7px;
  padding: 8px 11px;
  background: var(--surface);
  color: var(--accent-strong);
  font-weight: 800;
  text-decoration: none;
}

.tool-section {
  scroll-margin-top: 96px;
  margin-top: 34px;
}

.tool-results {
  scroll-margin-top: 96px;
  margin-top: 28px;
}

.os-section {
  margin: 30px 0 24px;
}

.os-grid {
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.os-card,
.virtual-lab-card {
  display: grid;
  gap: 18px;
  min-height: 250px;
  padding: 18px;
  background: var(--surface);
}

.os-card strong,
.virtual-lab-card strong {
  display: block;
  margin-bottom: 6px;
  font-size: 0.78rem;
  text-transform: uppercase;
}

.os-card a,
.virtual-lab-card a {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  margin-top: 14px;
  border: 1px solid color-mix(in srgb, var(--accent) 34%, var(--line));
  border-radius: 7px;
  padding: 8px 10px;
  color: var(--accent-strong);
  background: color-mix(in srgb, var(--accent) 10%, var(--surface-soft));
  font-weight: 800;
  text-decoration: none;
}

.os-card a:hover,
.os-card a:focus-visible,
.virtual-lab-card a:hover,
.virtual-lab-card a:focus-visible {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 16%, var(--surface-soft));
  outline: 0;
}

.virtual-lab-section {
  margin: 0 0 34px;
}

.virtual-lab-grid {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.virtual-lab-card {
  min-height: 220px;
  background: color-mix(in srgb, var(--surface) 84%, var(--surface-soft));
}

.language-section {
  margin: 0 0 34px;
}

.language-grid {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  align-items: stretch;
}

.language-card {
  position: relative;
  display: grid;
  gap: 16px;
  min-height: 260px;
  overflow: hidden;
  padding: 18px 18px 18px 22px;
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--surface) 88%, var(--surface-soft)), var(--surface));
}

.language-card::before {
  position: absolute;
  inset: 0 auto 0 0;
  width: 5px;
  background: var(--accent);
  content: "";
}

.language-card:nth-child(3n + 2)::before {
  background: #2563eb;
}

.language-card:nth-child(3n)::before {
  background: #b45309;
}

.language-card h3 {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: clamp(1.25rem, 1.9vw, 1.65rem);
  line-height: 1.05;
}

.language-card .os-base {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  min-height: 28px;
  border: 1px solid color-mix(in srgb, var(--accent) 32%, var(--line));
  border-radius: 999px;
  padding: 5px 9px;
  background: color-mix(in srgb, var(--accent) 9%, var(--surface-soft));
}

.language-card strong {
  display: inline-flex;
  width: fit-content;
  max-width: 100%;
  margin-bottom: 8px;
  border-radius: 6px;
  padding: 5px 8px;
  color: var(--ink);
  background: var(--surface-soft);
  font-size: 0.78rem;
  line-height: 1.2;
  text-transform: uppercase;
}

.language-card > div:last-child {
  align-self: end;
  border-top: 1px solid var(--line);
  padding-top: 14px;
}

.os-base {
  margin-bottom: 8px;
  color: var(--accent-strong);
  font-size: 0.78rem;
  font-weight: 800;
  text-transform: uppercase;
}

.tool-card {
  display: grid;
  gap: 18px;
  min-height: 210px;
  padding: 18px;
}

.tool-category {
  margin-bottom: 8px;
  color: var(--accent-strong);
  font-size: 0.78rem;
  font-weight: 800;
  text-transform: uppercase;
}

.tool-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-self: end;
}

.tool-actions a {
  align-self: end;
  justify-self: start;
  border: 1px solid color-mix(in srgb, var(--accent) 34%, var(--line));
  border-radius: 7px;
  padding: 8px 10px;
  color: var(--accent-strong);
  background: color-mix(in srgb, var(--accent) 10%, var(--surface-soft));
  font-weight: 800;
  text-decoration: none;
}

.tool-actions a + a {
  color: var(--accent-strong);
  background: var(--surface-soft);
}

.tool-actions a:hover,
.tool-actions a:focus-visible {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 16%, var(--surface-soft));
  outline: 0;
}

.related {
  position: sticky;
  top: 92px;
  align-self: start;
  display: grid;
  gap: 10px;
}

.related h2 {
  margin: 0 0 6px;
  font-size: 1rem;
}

.related a {
  display: grid;
  gap: 4px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px;
  background: var(--surface);
  text-decoration: none;
}

.related strong {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.related span,
.related p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.site-footer {
  display: flex;
  justify-content: center;
  padding: 28px 16px 36px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.92rem;
}

@media (max-width: 820px) {
  .hero,
  .detail-shell {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
    padding-top: 42px;
  }

  .related {
    position: static;
    padding-bottom: 36px;
  }

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

}

@media (max-width: 560px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
  }

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

  .site-nav a {
    text-align: center;
  }

  .hero h1,
  .page-intro h1,
  .detail-header h1 {
    font-size: 2.4rem;
    line-height: 1;
  }

  .search-box {
    display: grid;
    min-height: auto;
  }

  .search-box input {
    min-height: 56px;
  }

  .search-box button {
    min-height: 44px;
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .section-heading {
    align-items: flex-start;
    flex-direction: column;
  }

  .penguin-theme {
    right: 8px;
    bottom: 10px;
    transform: scale(0.86);
    transform-origin: right bottom;
  }

  .theme-menu {
    right: 0;
    bottom: 116px;
  }

  .penguin-tip {
    right: 70px;
    bottom: 86px;
    width: min(210px, calc(100vw - 124px));
  }

}