:root {
  color-scheme: dark;
  --paper: #091120;
  --card: rgba(25, 39, 61, 0.64);
  --inset: rgba(4, 12, 24, 0.55);
  --ink: #f6f8fc;
  --mute: #bdc9d9;
  --dim: #99aac0;
  --line: rgba(225, 237, 255, 0.13);
  --accent: #f5a524;
  --accent-soft: rgba(245, 165, 36, 0.11);
  --accent-line: rgba(245, 165, 36, 0.3);
  --teal: #2ec4a6;
  --err: #ff9b94;
  --sans: "Geist", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "Geist Mono", ui-monospace, Consolas, monospace;
  --radius: 14px;
  --rail-width: 224px;
  --rail-gap: 64px;
}

* { box-sizing: border-box; }
html { background: var(--paper); scroll-padding-top: 28px; }
body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background: radial-gradient(ellipse at 75% 0, rgba(35, 73, 104, 0.26), transparent 50%), radial-gradient(ellipse at 0 35%, rgba(25, 81, 84, 0.12), transparent 45%), var(--paper);
  font: 15px/1.65 var(--sans);
  -webkit-font-smoothing: antialiased;
  overflow-wrap: anywhere;
}
a { color: var(--accent); text-decoration: none; border-bottom: 1px solid var(--accent-line); transition: color 120ms, border-color 120ms; }
a:hover { color: #ffc66b; border-color: currentColor; }
button { font: inherit; }
strong { color: var(--ink); font-weight: 600; }
code { font-family: var(--mono); font-size: 0.9em; padding: 1px 5px; background: var(--inset); border: 1px solid var(--line); border-radius: 5px; }
:focus-visible { outline: 2px solid var(--teal); outline-offset: 4px; }
[hidden] { display: none !important; }
.skip-link { position: fixed; top: 8px; left: 8px; padding: 10px 16px; background: var(--paper); z-index: 10; transform: translateY(-160%); }
.skip-link:focus { transform: translateY(0); }
.shell { max-width: 1300px; margin: 0 auto; padding: 48px 48px 72px; }
.layout { display: grid; grid-template-columns: var(--rail-width) minmax(0, 1fr); gap: var(--rail-gap); align-items: start; }
.main { min-width: 0; }
.rail { position: sticky; top: 40px; max-height: calc(100vh - 80px); overflow-y: auto; scrollbar-width: thin; scrollbar-color: var(--line) transparent; padding: 4px 6px; }
.rail-inner { display: flex; flex-direction: column; gap: 30px; }
.brand { display: flex; gap: 12px; align-items: center; }
.brand-mark { display: grid; grid-template-columns: repeat(2, 14px); gap: 4px; flex: none; }
.brand-mark span { width: 14px; height: 14px; border-radius: 4px; background: rgba(206, 227, 247, 0.23); border: 1px solid var(--line); }
.brand-mark span:first-child { background: var(--accent); border-color: var(--accent); box-shadow: 0 0 18px rgba(245, 165, 36, 0.18); }
.brand-name { font-size: 17px; font-weight: 600; letter-spacing: -0.02em; line-height: 1.2; }
.brand-sub { font: 11.5px/1.6 var(--mono); color: var(--dim); }
.rail-label { font: 10.5px var(--mono); text-transform: uppercase; letter-spacing: 0.1em; color: var(--dim); margin-bottom: 12px; }
.toc { display: flex; flex-direction: column; gap: 3px; }
.toc-item { display: grid; grid-template-columns: 24px minmax(0, 1fr); gap: 9px; padding: 9px 8px; border: 1px solid transparent; border-radius: 8px; color: var(--mute); font-size: 13px; line-height: 1.4; }
.toc-num { font: 11px/1.65 var(--mono); color: var(--dim); }
.toc-item:hover { color: var(--ink); background: rgba(255, 255, 255, 0.04); border-color: transparent; }
.toc-item.is-active { background: var(--accent-soft); border-color: var(--accent-line); color: var(--ink); }
.toc-item.is-active .toc-num { color: var(--accent); }
.rail-links { display: flex; flex-direction: column; gap: 6px; }
.rail-links a { width: fit-content; color: var(--mute); font: 12px/1.8 var(--mono); border: 0; }
.rail-links a:hover { color: var(--accent); }
.rail-foot { padding-top: 18px; border-top: 1px solid var(--line); color: var(--dim); font: 11px var(--mono); }
.rail-foot span { color: var(--teal); }
.hero { margin-bottom: 38px; }
.hero h1 { margin: 0 0 20px; font-size: clamp(34px, 3.7vw, 48px); font-weight: 600; line-height: 1.12; letter-spacing: -0.04em; max-width: 24ch; text-wrap: balance; }
.accent { color: var(--accent); }
.hero p { margin: 0; max-width: 64ch; font-size: 16.5px; color: var(--mute); text-wrap: pretty; }
.showcase { margin-bottom: 30px; }
.showcase h2 { font-size: 21px; letter-spacing: -0.02em; margin: 0 0 8px; }
.showcase-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px 20px; }
.showcase figure { margin: 0; min-width: 0; }
.showcase img { display: block; width: 100%; height: auto; aspect-ratio: 3 / 2; object-fit: cover; border: 1px solid var(--line); border-radius: var(--radius); background: var(--inset); box-shadow: 0 8px 24px rgba(0, 0, 0, 0.18); }
.showcase figcaption { margin-top: 10px; color: var(--mute); font-size: 12.5px; line-height: 1.65; }
.preview-note { display: block; margin-top: 5px; color: var(--dim); font: 10.5px/1.6 var(--mono); }
.panel, .browser-callout, .creds, .note {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  -webkit-backdrop-filter: blur(18px);
  backdrop-filter: blur(18px);
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.16);
}
.panel { padding: 28px; margin-bottom: 22px; }
.panel-head { display: flex; align-items: flex-start; gap: 12px; margin-bottom: 22px; }
.num { flex: none; margin-top: 4px; padding: 3px 8px; border: 1px solid var(--accent-line); border-radius: 6px; background: var(--accent-soft); color: var(--accent); font: 11px/1.5 var(--mono); }
.panel-head h2 { margin: 0; font-size: 21px; line-height: 1.4; font-weight: 600; letter-spacing: -0.02em; scroll-margin-top: 36px; }
.section-sub { display: block; font: 11px/1.8 var(--mono); color: var(--dim); letter-spacing: 0; }
.lede, .path-body, .board-note { margin: 0 0 18px; color: var(--mute); font-size: 14.5px; text-wrap: pretty; }
.board-note { font-size: 13px; }
.hint { margin: 0; color: var(--dim); font-size: 12.5px; text-wrap: pretty; }
.checklist, .step-list { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 14px; }
.checklist li, .step-list li { position: relative; color: var(--mute); font-size: 14px; }
.checklist li { padding-left: 22px; }
.checklist li::before { content: ""; position: absolute; left: 1px; top: 9px; width: 6px; height: 6px; border-radius: 2px; background: var(--teal); }
.step-list { counter-reset: step; margin-bottom: 20px; }
.step-list li { counter-increment: step; padding-left: 36px; min-height: 24px; }
.step-list li::before { content: counter(step); position: absolute; top: 0; left: 0; width: 24px; height: 24px; display: grid; place-items: center; border: 1px solid var(--line); border-radius: 7px; background: rgba(46, 196, 166, 0.07); color: var(--teal); font: 11px var(--mono); }
.specs { display: flex; flex-direction: column; gap: 9px; margin: 0 0 20px; padding: 18px; background: var(--inset); border: 1px solid var(--line); border-radius: var(--radius); font-family: var(--mono); }
.spec-row, .creds-row { display: grid; grid-template-columns: 82px minmax(0, 1fr); gap: 16px; align-items: baseline; }
.spec-row dt, .creds-key { color: var(--dim); font-size: 11.5px; }
.spec-row dd { margin: 0; color: #d1f4eb; font-size: 12px; }
.status-line { margin: 0 0 14px; color: var(--dim); font: 12px/1.65 var(--mono); }
.status-line:empty { display: none; }
.status-line.error, .unsupported { color: var(--err); }
.status-line.warn { color: var(--accent); }
.status-line.ok { color: var(--teal); }
.install-row { display: flex; flex-direction: column; gap: 14px; }
.install-actions { display: flex; gap: 16px; align-items: center; flex-wrap: wrap; }
.install-actions > a { font-size: 12px; }
#install-slot { min-width: 0; max-width: 100%; min-height: 44px; --esp-tools-button-color: var(--accent); --esp-tools-button-text-color: #17120a; }
esp-web-install-button { display: inline-block; max-width: 100%; }
esp-web-install-button::part(button) { font-family: var(--sans); font-weight: 600; border-radius: 10px; min-height: 44px; }
/* Keep fallback slots hidden until the custom element is ready. */
esp-web-install-button:not(:defined) { visibility: hidden; }
.unsupported { font-size: 12px; }
.browser-callout { display: none; padding: 16px 18px; margin-bottom: 22px; color: var(--mute); font-size: 13px; gap: 14px; align-items: flex-start; }
.browser-callout.show { display: flex; }
.browser-callout strong { display: block; }
.pulse { flex: none; width: 7px; height: 7px; margin-top: 8px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 4px var(--accent-soft); }
.path + .path { margin-top: 28px; padding-top: 24px; border-top: 1px solid var(--line); }
.path-head { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 12px; }
.path-head h3 { margin: 0; font-size: 16px; font-weight: 600; }
.path-tag { display: inline-flex; align-items: center; gap: 7px; padding: 3px 8px; border: 1px solid rgba(46, 196, 166, 0.3); border-radius: 20px; background: rgba(46, 196, 166, 0.08); color: var(--teal); font: 10px/1.6 var(--mono); text-transform: uppercase; letter-spacing: 0.04em; }
.path-pulse { width: 5px; height: 5px; border-radius: 50%; background: var(--teal); }
.path-tag-muted { color: var(--dim); border-color: var(--line); background: var(--inset); }
.creds { margin: 0 0 20px; overflow: hidden; background: var(--inset); box-shadow: none; }
.creds-head { display: flex; align-items: center; gap: 9px; padding: 11px 16px; border-bottom: 1px solid var(--line); }
.creds-dot { width: 7px; height: 7px; border-radius: 2px; background: var(--teal); }
.creds-title { color: var(--dim); font: 11px var(--mono); }
.creds-row { padding: 11px 16px; border-bottom: 1px solid var(--line); font-family: var(--mono); }
.creds-val { font-size: 12px; min-width: 0; }
.creds-note { margin: 0; padding: 10px 16px; color: var(--dim); font: 10.5px/1.7 var(--mono); }
.os-tabs { display: inline-flex; gap: 4px; padding: 4px; background: var(--inset); border: 1px solid var(--line); border-radius: 10px; margin: 0 0 20px; }
.os-tab { padding: 9px 18px; border: 1px solid transparent; border-radius: 7px; background: transparent; color: var(--mute); font: 12px var(--mono); cursor: pointer; }
.os-tab:hover { color: var(--ink); }
.os-tab.is-active { color: var(--accent); background: var(--accent-soft); border-color: var(--accent-line); }
.os-panel { display: none; }
.os-panel.is-active { display: block; }
.note { display: flex; gap: 12px; align-items: baseline; padding: 12px 14px; margin: 0 0 16px; color: var(--mute); font-size: 12.5px; box-shadow: none; }
.note-k { color: var(--accent); font: 10px var(--mono); flex: none; }
.cmd { position: relative; background: var(--inset); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; margin: 0 0 20px; }
.cmd-head { display: flex; align-items: center; gap: 6px; padding: 12px; border-bottom: 1px solid var(--line); }
.cmd-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--line); }
.cmd-dot:nth-child(2) { background: var(--accent); }
.cmd-dot:nth-child(3) { background: var(--teal); }
.cmd-title { margin-left: auto; padding-right: 56px; color: var(--dim); font: 10px var(--mono); }
.cmd pre { margin: 0; padding: 16px; color: #d1f4eb; font: 12px/1.9 var(--mono); white-space: pre-wrap; overflow-wrap: anywhere; }
.pr { color: var(--dim); user-select: none; }
.cmd-copy { position: absolute; top: 6px; right: 9px; padding: 5px 9px; border-radius: 6px; border: 1px solid var(--line); background: rgba(255, 255, 255, 0.04); color: var(--mute); font: 10px var(--mono); cursor: pointer; }
.cmd-copy:hover, .cmd-copy.copied { color: var(--teal); }
.monitor-row { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 14px; }
.btn-monitor { padding: 10px 17px; min-height: 44px; border: 1px solid var(--accent-line); border-radius: 10px; background: var(--accent); color: #17120a; font-size: 13px; font-weight: 600; cursor: pointer; }
.btn-monitor:hover:not(:disabled) { filter: brightness(1.1); }
.btn-monitor:disabled { opacity: 0.45; cursor: not-allowed; }
.btn-ghost { color: var(--ink); background: rgba(255, 255, 255, 0.04); border-color: var(--line); }
.monitor-output { height: 320px; max-width: 100%; margin: 0 0 14px; padding: 16px; overflow: auto; white-space: pre-wrap; overflow-wrap: anywhere; border: 1px solid var(--line); border-radius: var(--radius); background: var(--inset); color: #bcebdc; font: 12px/1.6 var(--mono); scrollbar-width: thin; scrollbar-color: var(--dim) transparent; }
.monitor-output:empty::before { content: "Waiting for connection..."; color: var(--dim); }
.footer { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; padding-top: 20px; margin-top: 36px; border-top: 1px solid var(--line); color: var(--dim); font: 11px/1.8 var(--mono); }
.footer a { color: var(--mute); border: 0; }

@media (max-width: 1100px) {
  :root { --rail-width: 200px; --rail-gap: 32px; }
  .shell { padding: 32px 28px 56px; }
  .panel { padding: 24px; }
}
@media (max-width: 820px) {
  .shell { padding: 24px 22px 48px; }
  .layout { grid-template-columns: minmax(0, 1fr); gap: 28px; }
  .rail { position: static; max-height: none; overflow: visible; padding: 0 0 20px; border-bottom: 1px solid var(--line); }
  .rail-inner { display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: 16px; }
  .toc { display: none; }
  .rail-foot { grid-column: 2; grid-row: 1; border: 0; padding: 0; }
  .rail-links { grid-column: 1 / -1; flex-direction: row; flex-wrap: wrap; gap: 8px 20px; }
  .rail-links .rail-label { display: none; }
  .hero h1 { max-width: 26ch; }
}
@media (max-width: 560px) {
  .shell { padding: 22px 16px 36px; }
  .hero h1 { font-size: 32px; }
  .hero p { font-size: 15px; }
  .hero { margin-bottom: 28px; }
  .showcase-grid { grid-template-columns: minmax(0, 1fr); }
  .panel { padding: 20px 16px; }
  .panel-head { gap: 10px; }
  .panel-head h2 { font-size: 19px; }
  .spec-row, .creds-row { grid-template-columns: 65px minmax(0, 1fr); gap: 10px; }
  .specs { padding: 14px; }
  .note { flex-wrap: wrap; gap: 4px; }
  .cmd-title { font-size: 9px; }
  .cmd pre { padding: 12px; font-size: 11px; }
  .rail-foot { font-size: 10px; }
}