:root {
  --bg: #0c0c12;
  --bg-2: #101018;
  --surface: #121218;
  --chrome: #181824;
  --chrome-2: #1e1e2c;
  --line: #2a2a40;
  --header: #e6e6ee;
  --header-fg: #3a3a3a;
  --header-muted: #6e6e6e;
  --header-file: #4e4e4e;
  --text: #d0d0e0;
  --text-2: #b4b4c4;
  --muted: #7a7a8a;
  --faint: #5a5a6c;
  --hot: #ffffff;
  --warn: #e8c84a;
  --error: #ff8080;
  --del-fg: #cc7a7a;
  --del-bg: #3a1a1a;
  --del-ch: #752222;
  --add-fg: #7acc8a;
  --add-bg: #142814;
  --add-ch: #1a4c26;
  --ctx-fg: #8a8a8a;
  --ctx-bg: #121218;
  --note: #242436;
  --btn: #2a2a40;
  --btn-fg: #6a6a7e;
  --check: #525274;
  --check-done: #225834;
  --kw: #c586c0;
  --st: #ce9178;
  --fn: #dcdcaa;
  --num: #b5cea8;
  --type: #4ec9b0;
  --var: #9cdcfe;
  --plain: #d4d4d4;
  --cm: #6a9955;
  --max: 72rem;
  --nav-h: 2.6rem;
  --mono: ui-monospace, "Adwaita Mono", "SF Mono", "SFMono-Regular", Menlo,
    Monaco, "Cascadia Mono", Consolas, "Liberation Mono", "DejaVu Sans Mono",
    "Ubuntu Mono", "Nimbus Mono PS", monospace;
  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  background: var(--bg);
  color: var(--text);
}

html:focus-within {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--mono);
  font-size: 0.95rem;
  line-height: 1.6;
  font-variant-ligatures: none;
  font-feature-settings: "liga" 0, "calt" 0;
  background:
    radial-gradient(1200px 520px at 12% -10%, rgb(117 34 34 / 0.16), transparent 55%),
    radial-gradient(1000px 480px at 92% 0%, rgb(26 76 38 / 0.18), transparent 50%),
    var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img {
  max-width: 100%;
  height: auto;
}

a {
  color: var(--header);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--hot);
}

code {
  font-family: inherit;
  font-size: 0.92em;
  color: var(--header);
}

kbd {
  display: inline-block;
  padding: 0.05rem 0.32rem;
  background: var(--btn);
  color: var(--hot);
  font-family: inherit;
  font-size: 0.82em;
  line-height: 1.4;
}

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

::selection {
  background: var(--add-ch);
  color: var(--hot);
}

#install,
#keys {
  scroll-margin-top: 3.2rem;
}

.skip {
  position: absolute;
  left: 0.8rem;
  top: -3rem;
  z-index: 20;
  padding: 0.4rem 0.7rem;
  background: var(--header);
  color: var(--header-fg);
  font-size: 0.8rem;
}

.skip:focus {
  top: 0.8rem;
}

.wrap {
  width: min(100% - 2rem, var(--max));
  margin-inline: auto;
}

.wrap-wide {
  width: min(100% - 1.25rem, 76rem);
  margin-inline: auto;
}

/* ── top bar: the actual TUI header ── */

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  height: var(--nav-h);
  background: var(--header);
  color: var(--header-fg);
  display: flex;
  align-items: center;
  box-shadow: 0 1px 0 rgb(0 0 0 / 0.35);
}

.topbar-inner {
  width: min(100% - 1.25rem, 76rem);
  margin-inline: auto;
  display: flex;
  align-items: center;
  gap: 1rem;
  min-width: 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  min-width: 0;
  color: inherit;
  text-decoration: none;
  font-size: 0.85rem;
  letter-spacing: 0.01em;
  white-space: nowrap;
}

.brand:hover {
  color: inherit;
}

.brand .logo,
.tui-head .logo {
  flex: none;
  line-height: 1;
  font-family: "Apple Color Emoji", "Segoe UI Emoji", "Noto Color Emoji",
    "Twemoji Mozilla", sans-serif;
  font-style: normal;
  font-weight: 400;
}

.brand .logo {
  font-size: 1.05rem;
}

.tui-head .logo {
  font-size: 0.85rem;
}

.brand .name {
  color: var(--header-fg);
  font-weight: 700;
}

.topnav {
  margin-left: auto;
  display: flex;
  gap: 0.15rem;
  font-size: 0.8rem;
}

.topnav a {
  color: var(--header-muted);
  text-decoration: none;
  padding: 0.2rem 0.55rem;
}

.topnav a:hover,
.topnav a[aria-current="page"] {
  color: var(--header-fg);
}

.topnav .hot {
  color: var(--header-fg);
  font-weight: 700;
}

/* ── hero ── */

.hero {
  padding: 3.5rem 0 2rem;
}

.hero-grid {
  display: grid;
  gap: 2.4rem;
}

@media (min-width: 960px) {
  .hero {
    padding: 4.5rem 0 2.5rem;
  }

  .hero-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr);
    gap: 3rem;
    align-items: center;
  }
}

.kicker {
  margin: 0 0 0.9rem;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0;
  font-family: var(--mono);
  font-weight: 700;
  font-size: clamp(2.4rem, 7vw, 4.6rem);
  line-height: 1.05;
  letter-spacing: -0.04em;
  color: var(--hot);
  text-wrap: balance;
}

.lede {
  margin: 1.25rem 0 0;
  max-width: 36rem;
  color: var(--text-2);
  font-size: 1rem;
  line-height: 1.55;
}

.lede.tight {
  margin-top: 0;
}

.pair {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem 0.7rem;
  margin: 1.1rem 0 0;
  color: var(--muted);
  font-size: 0.82rem;
}

.pair b {
  color: var(--text);
  font-weight: 700;
}

.pair .dot {
  color: var(--faint);
}

.cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.7rem;
  margin-top: 1.6rem;
}

.install-chip {
  display: inline-flex;
  align-items: stretch;
  background: var(--chrome);
  border: 1px solid var(--line);
  min-width: 0;
}

.install-chip code {
  padding: 0.55rem 0.8rem;
  font-family: inherit;
  font-size: 0.85rem;
  color: var(--add-fg);
}

.copy {
  appearance: none;
  border: 0;
  border-left: 1px solid var(--line);
  background: var(--btn);
  color: var(--header);
  font-family: inherit;
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  padding: 0 0.85rem;
  cursor: pointer;
  min-height: 2.4rem;
}

.copy:hover,
.copy[data-copied="true"] {
  background: var(--add-ch);
  color: var(--hot);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.55rem 0.9rem;
  background: var(--header);
  color: var(--header-fg);
  text-decoration: none;
  font-size: 0.82rem;
  font-weight: 700;
  min-height: 2.4rem;
}

.btn:hover {
  color: #111;
  background: #fff;
}

.btn-ghost {
  background: transparent;
  color: var(--text-2);
  border: 1px solid var(--line);
}

.btn-ghost:hover {
  color: var(--hot);
  background: var(--chrome);
}

/* ── TUI ── */

.tui {
  --tui-fs: 0.72rem;
  position: relative;
  background: var(--surface);
  border: 1px solid var(--line);
  box-shadow:
    0 0 0 1px rgb(255 255 255 / 0.03),
    0 28px 80px rgb(0 0 0 / 0.45),
    0 0 90px rgb(26 76 38 / 0.08),
    0 0 70px rgb(117 34 34 / 0.06);
  font-size: var(--tui-fs);
  line-height: 1.45;
  overflow: hidden;
}

@media (min-width: 720px) {
  .tui {
    --tui-fs: 0.78rem;
  }
}

.tui:focus-visible {
  outline-offset: 4px;
}

.tui-head {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  height: 1.85rem;
  padding: 0 0.55rem;
  background: var(--header);
  color: var(--header-fg);
  white-space: nowrap;
  overflow: hidden;
  font-size: 0.72rem;
}

.tui-head .chrome {
  color: #5a5a5a;
}

.tui-head .repo {
  color: var(--header-fg);
  font-weight: 700;
}

.tui-head .dir {
  color: var(--header-muted);
}

.tui-head .file {
  color: var(--header-file);
}

.tui-head .meta {
  margin-left: auto;
  color: #5a5a5a;
}

.tui-body {
  display: grid;
  grid-template-columns: 1fr;
  min-height: 22rem;
  background: var(--ctx-bg);
  overflow: auto;
}

.tui[data-files="1"] .tui-body {
  grid-template-columns: 11.5rem 1fr;
}

.tui-files {
  display: none;
  background: var(--chrome);
  border-right: 1px solid var(--line);
  padding: 0.4rem 0;
}

.tui[data-files="1"] .tui-files {
  display: block;
}

.tui-files button {
  appearance: none;
  display: flex;
  width: 100%;
  gap: 0.35rem;
  border: 0;
  background: transparent;
  color: var(--muted);
  font: inherit;
  text-align: left;
  padding: 0.22rem 0.55rem;
  cursor: pointer;
}

.tui-files button[aria-current="true"] {
  color: var(--hot);
  background: var(--note);
}

.tui-files .mark {
  color: var(--faint);
  width: 0.9rem;
}

.tui-files button[aria-current="true"] .mark {
  color: var(--add-fg);
}

.tui-files .st {
  margin-left: auto;
  color: var(--faint);
  font-size: 0.65rem;
}

.tui-diff {
  margin: 0;
  padding: 0.15rem 0 0.4rem;
  overflow: auto;
  font-family: inherit;
  font-variant-ligatures: none;
  background: var(--ctx-bg);
}

.tui-diff .dl {
  display: grid;
  grid-template-columns: 1.35rem minmax(0, 1fr);
  min-height: 1.35em;
  white-space: pre;
}

.tui-diff .g {
  text-align: center;
  color: #808080;
  user-select: none;
}

.tui-diff .src {
  min-width: 0;
  overflow: hidden;
  color: var(--plain);
}

.tui-diff .ctx {
  background: var(--ctx-bg);
  color: var(--ctx-fg);
}

.tui-diff .ctx .src {
  color: var(--ctx-fg);
}

.tui-diff .del {
  background: var(--del-bg);
  color: var(--del-fg);
}

.tui-diff .add {
  background: var(--add-bg);
  color: var(--add-fg);
}

.tui-diff .ch {
  color: var(--hot);
  background: var(--del-ch);
}

.tui-diff .add .ch {
  background: var(--add-ch);
}

.tui[data-mode="side"] .tui-diff .tui-pair,
.tui[data-mode="mixed"] .tui-diff .tui-pair {
  display: grid;
  grid-template-columns: 1fr 1px 1fr;
}

.tui[data-mode="side"] .tui-diff .cell,
.tui[data-mode="mixed"] .tui-diff .cell {
  display: grid;
  grid-template-columns: 1.35rem minmax(0, 1fr);
  min-width: 0;
}

.tui-diff .split {
  background: #181824;
}

.tui-note {
  display: none;
  background: var(--note);
  border-top: 1px solid var(--line);
  padding: 0.45rem 0.7rem 0.55rem;
  color: var(--text);
}

.tui[data-note="1"] .tui-note {
  display: block;
}

.tui-note .cap {
  color: var(--muted);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
}

.tui-note .check {
  display: inline-block;
  margin-right: 0.35rem;
  padding: 0 0.28rem;
  background: var(--check);
  color: #f4f4fc;
}

.kw { color: var(--kw); }
.fn { color: var(--fn); }
.st { color: var(--st); }
.num { color: var(--num); }
.vr { color: var(--var); }
.tp { color: var(--type); }
.cm { color: var(--cm); }

.tui-foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.15rem 0.15rem;
  min-height: 2rem;
  padding: 0.25rem 0.4rem;
  background: var(--chrome);
  border-top: 1px solid var(--line);
}

.tui-foot button {
  appearance: none;
  border: 0;
  background: var(--btn);
  color: var(--btn-fg);
  font: inherit;
  font-size: 0.7rem;
  padding: 0.12rem 0.42rem;
  cursor: pointer;
}

.tui-foot button .h {
  color: var(--hot);
  font-weight: 700;
}

.tui-foot button:hover,
.tui-foot button[aria-pressed="true"] {
  color: var(--text);
}

.tui-msg {
  margin-left: auto;
  color: var(--muted);
  font-size: 0.7rem;
  padding-right: 0.3rem;
}

.tui-hint {
  margin: 0.55rem 0 0;
  color: var(--faint);
  font-size: 0.75rem;
}

.tui-hint.spaced {
  margin-top: 1rem;
}

/* ── sections ── */

section {
  padding: 3.2rem 0;
}

section h2 {
  margin: 0 0 1.4rem;
  font-family: var(--mono);
  font-weight: 700;
  font-size: clamp(1.45rem, 3vw, 2rem);
  letter-spacing: -0.03em;
  color: var(--hot);
}

.loop {
  display: grid;
  gap: 1rem;
}

@media (min-width: 800px) {
  .loop {
    grid-template-columns: 1fr auto 1fr;
    align-items: stretch;
  }
}

.card {
  background: var(--bg-2);
  border: 1px solid var(--line);
  padding: 1.35rem 1.4rem 1.45rem;
  min-width: 0;
}

.card.human {
  box-shadow: inset 3px 0 0 var(--del-ch);
}

.card.agent {
  box-shadow: inset 3px 0 0 var(--add-ch);
}

.card h3 {
  margin: 0 0 0.45rem;
  font-size: 1rem;
  font-weight: 700;
  color: var(--hot);
}

.card p {
  margin: 0;
  color: var(--text-2);
  font-size: 0.88rem;
}

.card .who {
  margin: 0 0 0.7rem;
  color: var(--muted);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.bridge {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  color: var(--muted);
  font-size: 0.72rem;
  padding: 0.4rem 0.2rem;
}

.bridge code {
  padding: 0.2rem 0.45rem;
  background: var(--chrome);
  color: var(--header);
  font-family: inherit;
  font-size: 0.72rem;
}

.features {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.feat {
  display: grid;
  gap: 0.35rem 1.5rem;
  padding: 1.15rem 0;
  border-bottom: 1px solid var(--line);
}

@media (min-width: 720px) {
  .feat {
    grid-template-columns: 13rem minmax(0, 1fr);
    align-items: baseline;
  }
}

.feat h3 {
  margin: 0;
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--hot);
}

.feat p {
  margin: 0;
  color: var(--text-2);
  font-size: 0.9rem;
}

.feat .tag {
  display: inline-block;
  margin-right: 0.4rem;
  color: var(--add-fg);
}

.feat:nth-child(even) .tag {
  color: var(--del-fg);
}

.steps {
  display: grid;
  gap: 1rem;
  counter-reset: step;
}

@media (min-width: 800px) {
  .steps {
    grid-template-columns: repeat(3, 1fr);
  }
}

.step {
  padding: 1.2rem 1.15rem 1.3rem;
  background: var(--surface);
  border: 1px solid var(--line);
}

.step::before {
  counter-increment: step;
  content: "0" counter(step);
  display: block;
  margin-bottom: 0.7rem;
  color: var(--add-fg);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
}

.step h3 {
  margin: 0 0 0.4rem;
  font-size: 0.95rem;
  color: var(--hot);
  font-weight: 700;
}

.step p {
  margin: 0;
  color: var(--text-2);
  font-size: 0.86rem;
}

.step kbd {
  display: inline-block;
  padding: 0 0.28rem;
  background: var(--btn);
  color: var(--hot);
  font-family: inherit;
  font-size: 0.78em;
}

.plan {
  display: grid;
  gap: 1.5rem;
}

@media (min-width: 880px) {
  .plan {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    align-items: start;
  }
}

.status-list {
  list-style: none;
  margin: 1rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.55rem;
}

.status-list li {
  display: grid;
  grid-template-columns: 6.2rem 1fr;
  gap: 0.8rem;
  font-size: 0.86rem;
  color: var(--text-2);
}

.pill {
  display: inline-block;
  padding: 0.05rem 0.4rem;
  font-size: 0.75rem;
  color: #f4f4fc;
  background: var(--check);
  width: fit-content;
}

.pill.ready { background: #3a5a88; }
.pill.partial { background: #6a5420; color: #fff4d0; }
.pill.done { background: var(--check-done); color: #f0fff4; }

.md {
  margin: 0;
  padding: 1rem 1.1rem 1.15rem;
  background: #16161e;
  border: 1px solid var(--line);
  color: var(--text-2);
  font-family: inherit;
  font-size: 0.78rem;
  line-height: 1.55;
  overflow: auto;
  white-space: pre;
}

.md .fm { color: var(--faint); }
.md .h { color: var(--hot); }
.md .ok { color: var(--add-fg); }
.md .item { color: var(--text); }

.install-panel {
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 1.2rem;
}

.install-panel pre {
  margin: 0;
  overflow: auto;
  font-family: inherit;
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--text);
}

.install-panel .c { color: var(--muted); }
.install-panel .g { color: var(--add-fg); }

.keys {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.86rem;
}

.keys th,
.keys td {
  text-align: left;
  padding: 0.55rem 0.4rem;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

.keys th {
  color: var(--muted);
  font-weight: 700;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.keys kbd {
  display: inline-block;
  min-width: 1.4rem;
  padding: 0.05rem 0.35rem;
  background: var(--btn);
  color: var(--hot);
  font-family: inherit;
  text-align: center;
}

.keys td:first-child {
  white-space: nowrap;
  width: 8rem;
}

.foot {
  padding: 1.4rem 0 2rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.78rem;
}

.foot-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 1.2rem;
  align-items: center;
}

.foot a {
  color: var(--text-2);
  text-decoration: none;
}

.foot a:hover {
  color: var(--hot);
}

.foot .sp {
  margin-left: auto;
}

@media (max-width: 719px) {
  .topnav {
    font-size: 0.72rem;
  }

  .topnav a {
    padding: 0.2rem 0.38rem;
  }

  .tui-body {
    min-height: 16rem;
  }

  .tui[data-files="1"] .tui-body {
    grid-template-columns: 1fr;
  }

  .tui[data-files="1"] .tui-files {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .status-list li {
    grid-template-columns: 1fr;
    gap: 0.15rem;
  }

  .keys td:first-child {
    width: auto;
  }

  .keys {
    display: block;
    overflow-x: auto;
  }
}

@media (max-width: 520px) {
  .cta {
    align-items: stretch;
  }

  .install-chip,
  .btn {
    width: 100%;
  }

  .topnav a[href*="npmjs"] {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .tui-diff .ch {
    transition: none;
  }
}