:root {
  --ink: var(--fz-ink);
  --ink-deep: var(--fz-ink-deep);
  --copy: var(--fz-ink-secondary);
  --muted: var(--fz-ink-muted);
  --paper: #edf1f8;
  --paper-soft: #f6f8fc;
  --white: var(--fz-white);
  --powder: var(--fz-powder);
  --blue: var(--fz-blue);
  --blue-high: var(--fz-blue-high);
  --blue-deep: var(--fz-blue-deep);
  --line: var(--fz-line);
  --line-soft: var(--fz-line-soft);
  --sage: #dfeadf;
  --sage-deep: #2e6c54;
  --peach: #f1dfd4;
  --berry: #913f55;
  --terminal: #071226;
  --terminal-soft: #101f38;
  --display: var(--fz-font-editorial);
  --body: var(--fz-font-body);
  --mono: var(--fz-font-mono);
  --wide: min(1540px, calc(100% - 48px));
  --reading: 68ch;
  color-scheme: light;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; overflow-x: hidden; }
body {
  margin: 0;
  overflow-x: hidden;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--body);
  font-size: 16px;
  line-height: 1.58;
  -webkit-font-smoothing: antialiased;
}

button,
input,
select,
textarea { font: inherit; }
button { cursor: pointer; }
a { color: inherit; }
img { max-width: 100%; display: block; }
code,
pre { font-family: var(--mono); }
[hidden] { display: none !important; }
.sr-only {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0,0,0,0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

h1,
h2,
h3,
h4 {
  margin-top: 0;
  color: var(--ink-deep);
  font-family: var(--display);
  font-weight: 500;
  letter-spacing: -.035em;
}
p { margin-top: 0; }

.wide-shell { width: var(--wide); margin-inline: auto; }
.eyebrow {
  margin: 0 0 10px;
  color: var(--blue-deep);
  font: 700 11px/1.4 var(--mono);
  letter-spacing: .11em;
  text-transform: uppercase;
}

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 999;
  padding: 10px 14px;
  transform: translateY(-150%);
  border-radius: 8px;
  background: var(--white);
  border: 2px solid var(--blue);
  font-weight: 700;
}
.skip-link:focus { transform: translateY(0); }

.button {
  min-height: 50px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 22px;
  border-radius: 14px;
  border: 1px solid rgba(255,255,255,.42);
  text-decoration: none;
  font-weight: 700;
  transition: transform var(--fz-duration-fast), background-color var(--fz-duration-fast), border-color var(--fz-duration-fast);
}
.button:hover { transform: translateY(-2px); }
.button-primary { background: var(--white); color: var(--ink-deep); }
.button-primary:hover { background: var(--powder); }
.button-secondary { background: rgba(255,255,255,.07); color: var(--white); }
.button-secondary:hover { background: rgba(255,255,255,.14); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: rgba(6,15,38,.96);
  color: var(--white);
  border-bottom: 1px solid rgba(255,255,255,.11);
  backdrop-filter: blur(14px);
}
.header-inner {
  min-height: 66px;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 18px;
}
.wordmark {
  width: fit-content;
  display: inline-flex;
  align-items: center;
  gap: 9px;
  color: inherit;
  text-decoration: none;
  font-weight: 700;
  letter-spacing: .04em;
}
.wordmark small { color: #8eb8f5; font-size: .7em; }
.wordmark-mark {
  width: 31px;
  height: 31px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--blue-deep);
  font: 500 20px var(--display);
}
.header-inner > p {
  margin: 0;
  color: rgba(255,255,255,.72);
  font: 700 10px var(--mono);
  letter-spacing: .12em;
  text-transform: uppercase;
}
.header-path {
  justify-self: end;
  color: rgba(255,255,255,.7);
  font-size: 12px;
}
.header-path b { margin-inline: 7px; color: #9fc2f7; }

.hero {
  position: relative;
  overflow: hidden;
  padding: clamp(64px, 8vw, 118px) 0 clamp(76px, 8vw, 116px);
  background:
    radial-gradient(circle at 77% 17%, rgba(77,138,234,.28), transparent 23%),
    radial-gradient(circle at 98% 83%, rgba(145,63,85,.2), transparent 26%),
    var(--ink-deep);
  color: var(--white);
}
.hero::before {
  content: "";
  position: absolute;
  width: 760px;
  height: 760px;
  right: -440px;
  top: -310px;
  border: 1px solid rgba(255,255,255,.08);
  border-radius: 50%;
  box-shadow: 0 0 0 110px rgba(255,255,255,.018), 0 0 0 220px rgba(255,255,255,.012);
}
.hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(470px, .95fr);
  gap: clamp(48px, 6vw, 98px);
  align-items: center;
}
.hero .eyebrow { color: #94baf2; }
.hero h1 {
  max-width: 12ch;
  margin: 0 0 26px;
  color: var(--white);
  font-size: clamp(54px, 6.5vw, 100px);
  line-height: .94;
  letter-spacing: -.055em;
}
.hero h1 em {
  display: block;
  color: #9fc2f7;
  font-weight: 400;
}
.hero-intro {
  max-width: 55ch;
  margin-bottom: 14px;
  color: rgba(255,255,255,.9);
  font-size: clamp(19px, 1.6vw, 23px);
  line-height: 1.5;
}
.hero-result {
  max-width: 62ch;
  margin: 0;
  color: rgba(255,255,255,.65);
  font-size: 15px;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.hero-facts {
  max-width: 760px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0,1fr));
  gap: 18px;
  margin: 38px 0 0;
  padding-top: 20px;
  border-top: 1px solid rgba(255,255,255,.16);
}
.hero-facts dt {
  color: rgba(255,255,255,.45);
  font: 700 9px var(--mono);
  letter-spacing: .1em;
  text-transform: uppercase;
}
.hero-facts dd { margin: 4px 0 0; color: rgba(255,255,255,.9); font-size: 13px; line-height: 1.45; }

.hero-system { position: relative; margin: 0; padding: 12px 0 84px 22px; }
.system-window {
  overflow: hidden;
  border-radius: 30px;
  border: 1px solid rgba(255,255,255,.24);
  background: rgba(255,255,255,.06);
  box-shadow: 0 36px 90px rgba(0,0,0,.34);
  backdrop-filter: blur(18px);
  transform: rotate(1.1deg);
}
.system-bar {
  min-height: 50px;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 0 18px;
  border-bottom: 1px solid rgba(255,255,255,.13);
  background: rgba(255,255,255,.08);
}
.system-bar code { color: rgba(255,255,255,.72); font-size: 11px; }
.system-dots { display: inline-flex; gap: 6px; }
.system-dots i { width: 9px; height: 9px; border-radius: 50%; background: rgba(255,255,255,.28); }
.system-body {
  min-height: 455px;
  display: grid;
  grid-template-columns: 155px minmax(0,1fr);
  gap: 18px;
  padding: 22px;
}
.hero-tree {
  display: flex;
  flex-direction: column;
  gap: 11px;
  padding: 16px 12px;
  border-radius: 18px;
  background: rgba(5,12,29,.54);
  color: rgba(255,255,255,.61);
  font: 400 10px/1.4 var(--mono);
}
.hero-tree strong { color: #b4cff6; }
.hero-tree span { padding-left: 12px; }
.system-previews { display: grid; }
.mini-site {
  border-radius: 22px;
  color: var(--ink-deep);
  box-shadow: 0 18px 35px rgba(0,0,0,.18);
}
.mini-site {
  padding: 28px;
  background: #fff8ee;
}
.mini-site small {
  display: block;
  margin-bottom: 18px;
  color: #875440;
  font: 700 9px var(--mono);
  letter-spacing: .1em;
  text-transform: uppercase;
}
.mini-site strong { display: block; margin-bottom: 12px; font: 500 34px/1 var(--display); }
.mini-site p { max-width: 21ch; color: #5f4d44; font-size: 14px; line-height: 1.45; }
.mini-site span { display: inline-block; padding: 9px 12px; border-radius: 9px; background: #7a3e2d; color: white; font-size: 11px; font-weight: 700; }
.hero-system figcaption {
  position: absolute;
  right: -16px;
  bottom: 0;
  width: min(390px, 78%);
  min-height: 132px;
  display: grid;
  grid-template-columns: 105px 1fr;
  align-items: center;
  gap: 16px;
  padding: 12px 18px 12px 12px;
  border-radius: 24px;
  background: var(--white);
  color: var(--copy);
  box-shadow: 0 24px 55px rgba(0,0,0,.28);
}
.hero-system figcaption img { width: 105px; height: 105px; object-fit: cover; border-radius: 17px; }
.hero-system figcaption p { margin: 0; font-size: 13px; line-height: 1.45; }
.hero-system figcaption strong { display: block; margin-bottom: 5px; color: var(--ink-deep); }

.course-premise {
  position: relative;
  z-index: 3;
  display: grid;
  grid-template-columns: minmax(260px,.55fr) minmax(0,1.45fr);
  gap: 48px;
  margin-top: -28px;
  padding: clamp(28px,4vw,48px);
  border-radius: 34px;
  background: var(--white);
  box-shadow: var(--fz-shadow-card);
}
.course-premise h2 { max-width: 8ch; margin: 0; font-size: clamp(38px,4vw,62px); line-height: 1; }
.course-premise ol {
  display: grid;
  grid-template-columns: repeat(2,minmax(0,1fr));
  gap: 10px 26px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.course-premise li { display: grid; grid-template-columns: 32px 1fr; gap: 12px; align-items: start; padding: 13px 0; border-bottom: 1px solid var(--line-soft); }
.course-premise li > span { width: 28px; height: 28px; display: grid; place-items: center; border-radius: 9px; background: var(--powder); color: var(--blue-deep); font: 700 10px var(--mono); }
.course-premise li p { margin: 0; color: var(--copy); font-size: 14px; }
.course-premise li strong { color: var(--ink-deep); }

.route-section { padding: clamp(78px,9vw,130px) 0; }
.section-heading { max-width: 940px; margin-bottom: 34px; }
.section-heading h2 { max-width: 14ch; margin-bottom: 18px; font-size: clamp(48px,5.5vw,82px); line-height: .98; }
.section-heading > p:last-child { max-width: var(--reading); margin-bottom: 0; color: var(--copy); font-size: 18px; }
.compact-heading h2 { max-width: 18ch; font-size: clamp(42px,4.7vw,70px); }
.route-grid { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 18px; }
.route-card { overflow: hidden; border: 1px solid var(--line); border-radius: 32px; background: var(--white); box-shadow: var(--fz-shadow-card); }
.route-card header { position: relative; padding: 30px 32px 24px; }
.route-card header > span { color: var(--blue-deep); font: 700 10px var(--mono); letter-spacing: .11em; text-transform: uppercase; }
.route-card h3 { margin: 6px 0 2px; font-size: 42px; line-height: 1; }
.route-card header p { margin: 0; color: var(--muted); font-size: 13px; }
.route-build header { background: var(--powder); }
.route-operations header { background: var(--sage); }
.route-fundamentals header { background: #f9f6f1; }
.route-card ol { margin: 0; padding: 0 30px 24px; list-style: none; }
.route-card li { display: grid; grid-template-columns: 38px 1fr; gap: 14px; padding: 18px 2px; border-bottom: 1px solid var(--line-soft); }
.route-card li:last-child { border-bottom: 0; }
.route-card li > b { padding-top: 3px; color: var(--blue-deep); font: 700 11px var(--mono); }
.route-card li strong { display: block; color: var(--ink-deep); font-size: 15px; }
.route-card li small { display: block; margin-top: 4px; color: var(--muted); font-size: 13px; line-height: 1.4; }

.tool-setup {
  margin-bottom: clamp(80px,9vw,130px);
  padding: clamp(34px,5vw,68px);
  border-radius: 38px;
  background: var(--ink-deep);
  color: var(--white);
  box-shadow: 0 34px 80px -40px rgba(6,15,38,.7);
}
.tool-setup .eyebrow { color: #94baf2; }
.tool-setup h2 { color: var(--white); }
.tool-setup .section-heading > p:last-child { color: rgba(255,255,255,.68); }
.terminal-value { overflow: hidden; margin-top: 30px; border: 1px solid rgba(255,255,255,.16); border-radius: 26px; background: rgba(255,255,255,.06); }
.terminal-value-compare { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); }
.terminal-value-compare article { padding: clamp(22px,3vw,34px); }
.terminal-value-compare article + article { border-left: 1px solid rgba(255,255,255,.13); background: rgba(145,188,247,.09); }
.terminal-value span { display: block; margin-bottom: 9px; color: #94baf2; font: 700 9px var(--mono); letter-spacing: .09em; text-transform: uppercase; }
.terminal-value h3 { max-width: 20ch; margin: 0 0 9px; color: var(--white); font-size: clamp(22px,2.4vw,34px); line-height: 1.04; }
.terminal-value p { max-width: 64ch; margin: 0; color: rgba(255,255,255,.7); font-size: 13px; }
.terminal-value-result { display: grid; grid-template-columns: minmax(170px,.32fr) minmax(0,1fr); gap: 22px; align-items: start; padding: 20px clamp(22px,3vw,34px); border-top: 1px solid rgba(255,255,255,.13); background: #f4c66b; color: var(--ink-deep); }
.terminal-value-result span { margin: 3px 0 0; color: #6b4b0e; }
.terminal-value-result p { max-width: 74ch; color: var(--ink-deep); font-size: 14px; }
.terminal-value-result strong { color: var(--ink-deep); }
.terminal-needs { overflow: hidden; display: grid; grid-template-columns: minmax(250px,.7fr) minmax(0,1.3fr); margin-top: 30px; border: 1px solid rgba(255,255,255,.16); border-radius: 26px; background: #f7f3ec; color: var(--ink-deep); }
.terminal-needs figure { position: relative; min-height: 310px; margin: 0; background: #192642; }
.terminal-needs figure::after { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg,transparent 42%,rgba(4,11,25,.85)); pointer-events: none; }
.terminal-needs figure img { width: 100%; height: 100%; min-height: 310px; object-fit: cover; object-position: 52% center; }
.terminal-needs figcaption { position: absolute; z-index: 1; left: 20px; right: 20px; bottom: 18px; padding-left: 14px; border-left: 3px solid #f1c870; color: white; }
.terminal-needs figcaption span { display: block; margin-bottom: 4px; color: #c4d5ef; font: 700 8px var(--mono); letter-spacing: .08em; text-transform: uppercase; }
.terminal-needs figcaption strong { font-size: 15px; line-height: 1.35; }
.terminal-needs-copy { padding: 26px 28px 24px; }
.terminal-needs-copy .eyebrow { margin-bottom: 7px; color: var(--blue-deep); }
.terminal-needs-copy h3 { max-width: 18ch; margin: 0 0 8px; font-size: clamp(26px,2.6vw,39px); line-height: 1.03; }
.terminal-needs-copy > p:not(.eyebrow):not(.terminal-needs-note) { max-width: 64ch; margin: 0; color: var(--copy); font-size: 12px; }
.terminal-needs-copy ul { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 1px; margin: 17px 0 13px; padding: 1px; list-style: none; background: #ddd6ca; }
.terminal-needs-copy li { display: grid; grid-template-columns: 1fr; gap: 7px; align-items: start; padding: 11px; background: #f7f3ec; }
.terminal-needs-copy li > span { width: 24px; height: 24px; display: grid; place-items: center; border-radius: 8px; background: var(--powder); color: var(--blue-deep); font: 700 8px var(--mono); }
.terminal-needs-copy li p { margin: 0; }
.terminal-needs-copy li strong { display: block; font-size: 12px; }
.terminal-needs-copy li small { display: block; margin-top: 2px; color: var(--copy); font-size: 10px; line-height: 1.4; }
.terminal-needs-note { margin: 0; color: #70511b; font-size: 10px; font-weight: 700; }
.installation-handoff {
  overflow: hidden;
  margin-top: 16px;
  border: 1px solid rgba(255,255,255,.16);
  border-radius: 24px;
  background: #f7f9fd;
  color: var(--ink-deep);
}
.installation-handoff > header {
  display: grid;
  grid-template-columns: minmax(260px,.72fr) minmax(0,1.28fr);
  gap: clamp(24px,4vw,54px);
  align-items: end;
  padding: 24px 26px 20px;
}
.installation-handoff .eyebrow { margin-bottom: 6px; color: var(--blue-deep); }
.installation-handoff h3 { max-width: 17ch; margin: 0; font-size: clamp(27px,2.7vw,40px); line-height: 1.02; }
.installation-handoff > header > p { max-width: 67ch; margin: 0; color: var(--copy); font-size: 13px; }
.installation-handoff ol {
  display: grid;
  grid-template-columns: repeat(5,minmax(0,1fr));
  gap: 1px;
  margin: 0;
  padding: 1px;
  background: #d9e1ed;
  list-style: none;
}
.installation-handoff li {
  min-width: 0;
  display: grid;
  grid-template-columns: 27px minmax(0,1fr);
  gap: 9px;
  align-items: center;
  padding: 13px 12px;
  background: white;
}
.installation-handoff li span {
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  background: var(--powder);
  color: var(--blue-deep);
  font: 700 8px var(--mono);
}
.installation-handoff li strong { font-size: 11px; line-height: 1.35; }
.installation-boundary { margin: 0; padding: 13px 26px; background: #e6eef9; color: #36506f; font-size: 11px; }
.installation-boundary strong { color: var(--ink-deep); }
.provider-boundary { margin: 0; padding: 13px 26px; border-top: 1px solid #ead7c9; background: #fff8f1; color: #624b42; font-size: 11px; }
.provider-boundary strong { color: var(--ink-deep); }
.app-fallback {
  margin-top: 12px;
  border: 1px solid rgba(255,255,255,.18);
  border-radius: 18px;
  background: rgba(255,255,255,.055);
}
.app-fallback > summary {
  min-height: 62px;
  display: grid;
  grid-template-columns: minmax(0,1fr) auto;
  gap: 20px;
  align-items: center;
  padding: 13px 18px;
  cursor: pointer;
  list-style: none;
}
.app-fallback > summary::-webkit-details-marker { display: none; }
.app-fallback > summary::after {
  content: "+";
  grid-column: 2;
  grid-row: 1 / span 2;
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(255,255,255,.2);
  border-radius: 50%;
  color: #b8cff0;
  font: 700 15px var(--mono);
}
.app-fallback[open] > summary::after { content: "−"; }
.app-fallback > summary span { color: white; font-size: 14px; font-weight: 800; }
.app-fallback > summary small { grid-column: 1; color: #9eb3d1; font-size: 10px; }
.app-fallback-body { padding: 0 18px 18px; }
.app-fallback-body > p:first-child { margin: 0 0 12px; color: #c7d4e8; font-size: 12px; }
.app-fallback-options { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 10px; }
.app-fallback-options article { padding: 16px; border-radius: 14px; background: #f7f9fd; color: var(--ink-deep); }
.app-fallback-options article > span { display: block; margin-bottom: 5px; color: var(--blue-deep); font: 700 8px var(--mono); letter-spacing: .09em; text-transform: uppercase; }
.app-fallback-options h3 { margin: 0 0 6px; font-family: var(--body); font-size: 15px; font-weight: 800; letter-spacing: -.02em; }
.app-fallback-options p { margin: 0; color: var(--copy); font-size: 11px; }
.app-fallback-close { margin: 12px 1px 0; color: #b9c9df; font-size: 11px; }
.setup-choices { display: grid; grid-template-columns: minmax(230px,.42fr) minmax(0,1.58fr); gap: 16px; margin: 30px 0 18px; }
.setup-choice { min-width: 0; }
.setup-choice-label { display: block; margin-bottom: 9px; color: #94baf2; font: 700 9px var(--mono); letter-spacing: .09em; text-transform: uppercase; }
.platform-picker { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 8px; }
.platform-picker button {
  min-height: 66px;
  padding: 12px;
  border: 1px solid rgba(255,255,255,.16);
  border-radius: 16px;
  background: rgba(255,255,255,.06);
  color: var(--white);
  font-weight: 700;
}
.platform-picker button[aria-pressed="true"] { border-color: #8eb8f5; background: #f7f9fd; color: var(--ink-deep); box-shadow: 0 0 0 3px rgba(142,184,245,.19); }
.tool-picker { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 8px; }
.tool-picker button {
  display: grid;
  grid-template-columns: 38px 1fr;
  align-items: center;
  gap: 10px;
  min-height: 66px;
  padding: 10px 12px;
  border: 1px solid rgba(255,255,255,.16);
  border-radius: 16px;
  background: rgba(255,255,255,.06);
  color: var(--white);
  text-align: left;
}
.tool-picker button:hover { background: rgba(255,255,255,.1); }
.tool-picker button:disabled { cursor: not-allowed; opacity: .56; }
.tool-picker button[aria-pressed="true"]:disabled { opacity: 1; }
.tool-picker button[aria-pressed="true"] { border-color: #8eb8f5; background: #f7f9fd; color: var(--ink-deep); box-shadow: 0 0 0 3px rgba(142,184,245,.19); }
.tool-mark { width: 36px; height: 36px; display: grid; place-items: center; border-radius: 11px; background: var(--blue-deep); color: white; font: 500 18px var(--display); }
.tool-picker strong,
.tool-picker small { display: block; }
.tool-picker small { margin-top: 2px; color: inherit; opacity: .62; font-size: 11px; }
.tool-guide {
  overflow: hidden;
  border-radius: 24px;
  background: rgba(255,255,255,.07);
  border: 1px solid rgba(255,255,255,.14);
}
.tool-guide h3 { margin-bottom: 8px; color: var(--white); font-family: var(--body); font-size: 18px; font-weight: 700; letter-spacing: -.015em; }
.tool-guide p { margin-bottom: 0; color: rgba(255,255,255,.68); font-size: 13px; }
.agent-preflight { container-type: inline-size; min-width: 0; }
.preflight-header { display: grid; grid-template-columns: minmax(0,1fr) auto; gap: 18px; align-items: start; padding: 22px 22px 7px; }
.preflight-kicker { display: block; margin-bottom: 5px; color: #94baf2; font: 700 9px var(--mono); letter-spacing: .09em; text-transform: uppercase; }
.preflight-header h3 { margin: 0 0 5px; font-size: 22px; }
.preflight-header p { max-width: 75ch; }
.preflight-count { padding: 7px 9px; border: 1px solid rgba(255,255,255,.15); border-radius: 99px; color: #c8daf4; font: 700 9px var(--mono); white-space: nowrap; }
.tool-guide-links { display: flex; flex-wrap: wrap; gap: 8px 14px; padding: 7px 22px 16px; }
.tool-guide a { color: #a9c9f7; font-size: 12px; font-weight: 700; }
.tool-lock-note { margin: 0 22px 13px !important; color: #cbdcf5 !important; font-weight: 700; }
.checked-note { margin: 13px 2px 0; color: rgba(255,255,255,.68); font-size: 11px; }
.preflight-steps { display: flex; gap: 6px; margin: 0; padding: 10px 14px 12px; overflow-x: auto; border-top: 1px solid rgba(255,255,255,.09); border-bottom: 1px solid rgba(255,255,255,.09); list-style: none; scroll-snap-type: x proximity; }
.preflight-steps li { min-width: 104px; flex: 1 0 104px; scroll-snap-align: start; }
.preflight-steps button { width: 100%; min-height: 48px; display: grid; grid-template-columns: 22px 1fr; gap: 7px; align-items: center; padding: 7px 9px; border: 1px solid rgba(255,255,255,.12); border-radius: 10px; background: rgba(255,255,255,.035); color: #b9c9df; font-size: 10px; font-weight: 700; text-align: left; }
.preflight-steps button > span { width: 21px; height: 21px; display: grid; place-items: center; border-radius: 7px; background: rgba(255,255,255,.08); color: #8fa8ca; font: 700 8px var(--mono); }
.preflight-steps button small { grid-column: 2; margin-top: -9px; color: inherit; font-size: 8px; opacity: .65; }
.preflight-steps button[aria-current="step"] { border-color: #9fc2f7; background: #edf4ff; color: var(--ink-deep); }
.preflight-steps button[aria-current="step"] > span { background: var(--blue-deep); color: white; }
.preflight-panel { display: grid; grid-template-columns: minmax(0,.9fr) minmax(320px,1.1fr); gap: 12px; align-items: start; padding: 14px; background: #dfe6f0; }
.preflight-copy { min-width: 0; display: flex; flex-direction: column; align-self: start; padding: 23px; border-radius: 17px; background: white; color: var(--ink-deep); }
.preflight-progress { color: var(--blue-deep); font: 700 9px var(--mono); letter-spacing: .08em; text-transform: uppercase; }
.preflight-copy h4 { margin: 9px 0 8px; font-family: var(--body); font-size: 22px; font-weight: 700; letter-spacing: -.025em; }
.preflight-copy > p { color: var(--copy); font-size: 13px; }
.preflight-command { display: grid; grid-template-columns: minmax(0,1fr) auto; gap: 7px 10px; align-items: center; margin: 5px 0 14px; padding: 12px; border-radius: 12px; background: var(--terminal); }
.preflight-command > span { grid-column: 1 / -1; color: #819abc; font: 700 8px var(--mono); letter-spacing: .08em; text-transform: uppercase; }
.preflight-command code { min-width: 0; color: #e9f1ff; font-size: 11px; overflow-wrap: anywhere; white-space: pre-wrap; }
.preflight-command button { min-height: 44px; padding: 8px 11px; border: 1px solid rgba(255,255,255,.24); border-radius: 9px; background: rgba(255,255,255,.1); color: white; font-size: 10px; font-weight: 700; }
.preflight-expected { margin-top: auto; padding: 13px 14px; border-radius: 12px; background: #edf6ee; color: #365446 !important; }
.preflight-expected strong { display: block; margin-bottom: 4px; color: #214332; }
.preflight-assistance { padding: 0 14px 14px; background: #dfe6f0; color: var(--ink-deep); }
.preflight-support { border: 1px solid #cbd9ec; border-radius: 12px; background: #f4f8fe; }
.preflight-support > summary { min-height: 44px; display: flex; align-items: center; padding: 10px 12px; cursor: pointer; color: var(--blue-deep); font-size: 11px; font-weight: 800; }
.preflight-support > summary::after,
.preflight-faqs summary::after,
.preflight-prompt-preview summary::after { content: "+"; margin-left: auto; padding-left: 9px; color: var(--blue-deep); font-family: var(--mono); }
.preflight-support[open] > summary::after,
.preflight-faqs details[open] > summary::after,
.preflight-prompt-preview[open] > summary::after { content: "−"; }
.preflight-support-body { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 14px; padding: 0 12px 12px; }
.preflight-support-action,
.preflight-support-safety { min-width: 0; display: grid; align-content: start; gap: 9px; }
.preflight-support-body p { margin: 0; color: var(--copy); font-size: 10px; }
.preflight-first-check { padding: 10px; border-radius: 9px; background: white; }
.preflight-first-check strong,
.preflight-privacy strong { display: block; margin-bottom: 3px; color: var(--ink-deep); }
.preflight-support-action label { color: var(--ink-deep); font-size: 10px; font-weight: 800; }
.preflight-support-action textarea { width: 100%; min-height: 82px; resize: vertical; padding: 10px; border: 1px solid #aebfd7; border-radius: 9px; background: white; color: var(--ink-deep); font: 500 10px/1.5 var(--mono); overflow-wrap: anywhere; }
.preflight-support-action textarea:focus { outline: 3px solid rgba(38,87,168,.18); border-color: var(--blue-deep); }
.preflight-support-action > button { min-height: 44px; padding: 9px 12px; border: 0; border-radius: 9px; background: var(--blue-deep); color: white; font-size: 10px; font-weight: 800; }
.preflight-support-action > button:disabled { cursor: not-allowed; background: #a7b5ca; color: #eef3fa; }
.preflight-privacy { padding-left: 9px; border-left: 3px solid #e2ad35; }
.preflight-prompt-preview { border-top: 1px solid #dbe4f0; }
.preflight-prompt-preview summary { min-height: 44px; display: flex; align-items: center; cursor: pointer; color: var(--blue-deep); font-size: 10px; font-weight: 700; }
.preflight-prompt-preview pre { max-height: 190px; margin: 0; padding: 10px; overflow: auto; border-radius: 9px; background: var(--terminal); color: #dfeaff; font: 500 9px/1.55 var(--mono); white-space: pre-wrap; overflow-wrap: anywhere; }
.preflight-safe-answer { color: #4f6078 !important; }
.preflight-faqs { margin-top: 10px; padding: 0 12px 12px; border: 1px solid #ccd5e2; border-radius: 12px; background: white; }
.preflight-faqs > span { display: block; padding: 11px 1px 7px; color: #64748b; font: 800 8px var(--mono); letter-spacing: .08em; text-transform: uppercase; }
.preflight-faqs > div { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 7px; }
.preflight-faqs details { padding: 0 10px; border: 1px solid var(--line-soft); border-radius: 9px; background: #f8fafc; }
.preflight-faqs summary { min-height: 44px; display: flex; align-items: center; cursor: pointer; color: var(--ink-deep); font-size: 10px; font-weight: 800; }
.preflight-faqs p { margin: 0 0 11px; color: var(--copy); font-size: 10px; }
.preflight-screen { min-width: 0; min-height: 300px; overflow: hidden; border-radius: 17px; background: var(--terminal); box-shadow: 0 14px 30px rgba(7,18,38,.18); }
.preflight-screen .launcher-mock { min-height: 300px; }
.preflight-terminal-window { min-height: 300px; background: var(--terminal); }
.mock-terminal-bar,
.folder-titlebar {
  min-height: 34px;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  padding: 6px 10px;
}
.mock-terminal-bar { border-bottom: 1px solid rgba(255,255,255,.1); background: var(--terminal-soft); color: #adbed7; }
.mock-terminal-bar > b { font: 600 9px var(--body); letter-spacing: 0; }
.window-dots { display: flex; gap: 5px; justify-self: start; }
.window-dots i { width: 8px; height: 8px; border-radius: 50%; background: #ef6a5d; }
.window-dots i:nth-child(2) { background: #e6bd4c; }
.window-dots i:nth-child(3) { background: #61c454; }
.preflight-terminal-lines { min-height: 266px; display: flex; flex-direction: column; gap: 7px; padding: 46px 18px 18px; }
.preflight-terminal-lines code,
.preflight-terminal-lines samp { color: #dfeaff; font: 500 10px/1.55 var(--mono); overflow-wrap: anywhere; }
.preflight-terminal-lines code b { color: #77d5ad; font-weight: 700; }
.preflight-terminal-lines samp { padding-left: 13px; color: #91a9ca; }
.preflight-permission-mock { min-height: 300px; display: flex; flex-direction: column; padding: 24px; background: #f7f9fc; color: var(--ink-deep); }
.course-mock-label { align-self: flex-end; padding: 4px 7px; border-radius: 99px; background: var(--ink-deep); color: white; font: 700 8px var(--mono); }
.permission-product { margin-top: 8px; color: var(--blue-deep); font: 700 9px var(--mono); letter-spacing: .08em; text-transform: uppercase; }
.preflight-permission-mock > strong { margin: 4px 0 12px; font-size: 18px; }
.preflight-permission-mock > div:not(.course-mock-label) { display: grid; gap: 6px; }
.permission-row { display: grid; grid-template-columns: 25px 1fr; gap: 8px; align-items: center; padding: 9px 10px; border: 1px solid #d9e0ea; border-radius: 10px; background: white; }
.permission-row > b { width: 22px; height: 22px; display: grid; place-items: center; border-radius: 7px; background: #edf1f6; color: var(--blue-deep); }
.permission-row strong,
.permission-row small { display: block; }
.permission-row strong { font-size: 11px; }
.permission-row small { margin-top: 1px; color: var(--muted); font-size: 9px; }
.permission-row.is-selected { border-color: #77a5e4; background: #edf4ff; }
.mock-caveat { margin-top: auto; padding-top: 10px; color: var(--muted); font-size: 9px; }
.surface-guide { display: grid; grid-template-columns: minmax(0,1fr) auto minmax(0,1fr); gap: 10px; align-items: center; padding: 12px 14px; border-top: 1px solid rgba(255,255,255,.09); border-bottom: 1px solid rgba(255,255,255,.09); }
.surface-place { min-width: 0; padding: 10px 12px; border: 1px solid rgba(255,255,255,.1); border-radius: 11px; background: rgba(255,255,255,.03); }
.surface-place.is-active { border-color: #9fc2f7; background: rgba(159,194,247,.12); box-shadow: inset 3px 0 0 #9fc2f7; }
.surface-place > span { display: block; margin-bottom: 3px; color: #8fa8ca; font: 700 8px var(--mono); letter-spacing: .08em; text-transform: uppercase; }
.surface-place strong { display: block; color: white; font-size: 12px; }
.surface-place code { display: block; margin-top: 3px; color: #a9c9f7; font-size: 9px; overflow-wrap: anywhere; }
.surface-place p { margin-top: 4px; color: #93a9c9; font-size: 9px; }
.surface-arrow { color: #8fa8ca; font-size: 18px; }
.preflight-footer { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; padding: 13px 14px; }
.preflight-footer button,
.preflight-footer a { min-height: 44px; display: inline-flex; align-items: center; justify-content: center; padding: 8px 13px; border: 1px solid rgba(255,255,255,.18); border-radius: 10px; background: rgba(255,255,255,.06); color: white; font-size: 11px; font-weight: 700; }
.preflight-footer button:disabled { cursor: not-allowed; opacity: .35; }
.preflight-footer .preflight-next { margin-left: auto; border-color: #b8cff0; background: #edf4ff; color: var(--ink-deep); }
.preflight-footer a { text-decoration: none; }
.preflight-status { margin: 0; padding: 0 14px 12px; color: #a8d4b2 !important; font-size: 10px !important; }
.tool-setup button:focus-visible,
.tool-setup a:focus-visible,
.tool-setup summary:focus-visible { outline: 3px solid #f2c969; outline-offset: 2px; }

@container (max-width: 760px) {
  .preflight-panel { grid-template-columns: 1fr; }
  .preflight-screen { min-height: 270px; }
  .preflight-screen .launcher-mock,
  .preflight-terminal-window,
  .preflight-permission-mock { min-height: 270px; }
  .surface-guide { grid-template-columns: 1fr; }
  .surface-arrow { justify-self: center; transform: rotate(90deg); }
}

.course-shell {
  display: grid;
  grid-template-columns: 235px minmax(0,1fr) 300px;
  gap: 24px;
  align-items: start;
  margin-bottom: clamp(90px,10vw,150px);
}
.chapter-rail,
.project-dock {
  position: sticky;
  top: 88px;
  max-height: calc(100vh - 112px);
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 25px;
  background: rgba(255,255,255,.82);
  box-shadow: var(--fz-shadow-card);
  backdrop-filter: blur(15px);
}
.rail-progress { padding: 19px; border-bottom: 1px solid var(--line-soft); }
.rail-progress span { display: block; color: var(--muted); font: 700 9px var(--mono); letter-spacing: .08em; text-transform: uppercase; }
.rail-progress strong { display: block; margin: 5px 0 10px; font-size: 13px; }
.rail-progress progress { width: 100%; height: 7px; accent-color: var(--blue); }
#chapterNav { display: flex; flex-direction: column; padding: 8px; }
.chapter-button {
  display: grid;
  grid-template-columns: 29px 1fr 16px;
  gap: 9px;
  align-items: start;
  width: 100%;
  padding: 11px 9px;
  border: 0;
  border-radius: 13px;
  background: transparent;
  color: var(--copy);
  text-align: left;
}
.chapter-button:hover { background: var(--paper-soft); }
.chapter-button[aria-current="step"] { background: var(--powder); color: var(--ink-deep); }
.chapter-button > span:first-child { color: var(--blue-deep); font: 700 9px var(--mono); }
.chapter-button strong { display: block; font-size: 12px; line-height: 1.3; }
.chapter-button small { display: block; margin-top: 3px; color: var(--muted); font-size: 10px; }
.chapter-check { color: var(--sage-deep); font-size: 12px; }
.reset-button {
  min-height: 44px;
  width: calc(100% - 20px);
  margin: 2px 10px 12px;
  padding: 9px;
  border: 0;
  border-radius: 10px;
  background: transparent;
  color: var(--muted);
  font-size: 10px;
  text-decoration: underline;
}
.mobile-course-nav { display: none; }
.lesson-column { min-width: 0; }
.lesson {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 32px;
  background: var(--white);
  box-shadow: var(--fz-shadow-card);
}
.lesson-opening {
  display: grid;
  grid-template-columns: minmax(0,1.12fr) minmax(260px,.68fr);
  min-height: 430px;
  background: var(--paper-soft);
}
.lesson-opening-copy { padding: clamp(30px,4vw,56px); }
.lesson-meta { display: flex; flex-wrap: wrap; gap: 7px; margin-bottom: 24px; }
.lesson-meta span { padding: 6px 9px; border-radius: 99px; background: var(--powder); color: var(--blue-deep); font: 700 9px var(--mono); letter-spacing: .07em; text-transform: uppercase; }
#lessonTitle { max-width: 13ch; margin-bottom: 18px; font-size: clamp(44px,4.5vw,72px); line-height: .97; }
.lesson-summary { max-width: 56ch; margin-bottom: 23px; color: var(--copy); font-size: 17px; }
.lesson-output {
  max-width: 58ch;
  display: grid;
  grid-template-columns: 32px 1fr;
  gap: 10px;
  margin: 0;
  padding: 13px 15px;
  border-radius: 15px;
  background: var(--white);
  color: var(--copy);
  font-size: 13px;
}
.lesson-output::before { content: "✓"; width: 26px; height: 26px; display: grid; place-items: center; border-radius: 8px; background: var(--sage); color: var(--sage-deep); font-weight: 800; }
.lesson-output strong { color: var(--ink-deep); }
.lesson-scene { position: relative; overflow: hidden; margin: 0; min-height: 100%; background: var(--ink-deep); }
.lesson-scene img { width: 100%; height: 100%; min-height: 430px; object-fit: cover; opacity: .86; }
.lesson-scene figcaption {
  position: absolute;
  right: 16px;
  bottom: 16px;
  left: 16px;
  padding: 15px 17px;
  border-radius: 16px;
  background: rgba(6,15,38,.9);
  color: rgba(255,255,255,.84);
  font-size: 12px;
  backdrop-filter: blur(10px);
}
.lesson-scene figcaption strong { display: block; margin-bottom: 3px; color: white; font-size: 13px; }
.lesson-body { padding: clamp(26px,4vw,54px); }
.lesson-section { margin-bottom: 46px; }
.lesson-section:last-child { margin-bottom: 0; }
.lesson-section > h3 { max-width: 17ch; margin-bottom: 15px; font-size: clamp(35px,3.7vw,55px); line-height: 1; }
.lesson-section > p { max-width: var(--reading); color: var(--copy); }
.plain-note {
  max-width: 780px;
  margin-top: 19px;
  padding: 18px 20px;
  border-left: 4px solid var(--blue);
  border-radius: 0 16px 16px 0;
  background: var(--paper-soft);
  color: var(--copy);
}
.plain-note p:last-child { margin-bottom: 0; }
.plain-note strong { color: var(--ink-deep); }

.command-vs-prompt { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 14px; margin-top: 23px; }
.command-vs-prompt article { padding: 20px; border-radius: 20px; border: 1px solid var(--line); background: var(--paper-soft); }
.command-vs-prompt span { display: inline-flex; margin-bottom: 11px; padding: 5px 8px; border-radius: 99px; color: var(--blue-deep); background: var(--powder); font: 700 8px var(--mono); letter-spacing: .08em; text-transform: uppercase; }
.command-vs-prompt h4 { margin-bottom: 8px; font-family: var(--body); font-size: 17px; font-weight: 700; letter-spacing: -.02em; }
.command-vs-prompt p { margin: 0; color: var(--copy); font-size: 13px; }

.workspace-demo {
  container-type: inline-size;
  overflow: hidden;
  max-width: 100%;
  margin-top: 24px;
  border: 1px solid rgba(255,255,255,.1);
  border-radius: 25px;
  background: var(--terminal);
  color: #eaf2ff;
  box-shadow: 0 22px 60px rgba(7,18,38,.18);
}
.workspace-demo-header {
  display: grid;
  grid-template-columns: minmax(0,1fr) auto;
  gap: 18px;
  align-items: center;
  padding: 16px 18px;
  border-bottom: 1px solid rgba(255,255,255,.1);
  background: var(--terminal-soft);
}
.workspace-demo-header strong,
.workspace-demo-header span { display: block; }
.workspace-demo-header strong { color: white; font-size: 14px; }
.workspace-demo-header span { margin-top: 2px; color: #93a9c9; font-size: 10px; }
.workspace-demo-header button {
  min-height: 44px;
  padding: 8px 13px;
  border: 1px solid rgba(255,255,255,.23);
  border-radius: 10px;
  background: rgba(255,255,255,.08);
  color: white;
  font-size: 11px;
  font-weight: 700;
}
.workspace-demo-header button:hover { background: rgba(255,255,255,.14); }
.workspace-demo-toolbar {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px;
  padding: 11px 14px;
  border-bottom: 1px solid rgba(255,255,255,.09);
}
.demo-toggle { display: flex; flex-wrap: wrap; gap: 6px; }
.demo-platform-note { align-self: center; color: #93a9c9; font-size: 9px; }
.demo-toggle button {
  min-height: 44px;
  padding: 7px 10px;
  border: 1px solid rgba(255,255,255,.15);
  border-radius: 9px;
  background: transparent;
  color: #b5c6df;
  font-size: 10px;
  font-weight: 700;
}
.demo-toggle button[aria-pressed="true"] { border-color: #a8c9f7; background: #edf4ff; color: var(--ink-deep); }
.workspace-demo-stage {
  display: grid;
  grid-template-columns: minmax(0,1.42fr) minmax(210px,.58fr);
  gap: 14px;
  padding: 14px;
  background: #dfe6f0;
}
.workspace-screen {
  position: relative;
  min-width: 0;
  min-height: 340px;
  overflow: hidden;
  border-radius: 17px;
  background: #abb8cb;
  box-shadow: inset 0 0 0 1px rgba(7,18,38,.12);
}
.workspace-mock-inner { position: relative; width: 100%; height: 100%; min-height: inherit; }
.computer-mock-label {
  position: absolute;
  top: 10px;
  right: 10px;
  z-index: 8;
  padding: 4px 7px;
  border-radius: 99px;
  background: rgba(7,18,38,.76);
  color: rgba(255,255,255,.86);
  font: 700 8px var(--mono);
  letter-spacing: .04em;
}
.folder-window,
.terminal-window,
.launcher-mock { width: 100%; height: 100%; min-height: 340px; }
.folder-window { overflow: hidden; background: #f8fafc; color: #192335; }
.folder-titlebar { background: #e8edf3; border-bottom: 1px solid #cad3df; }
.folder-titlebar > strong { justify-self: center; font-size: 10px; }
.window-controls { justify-self: end; color: inherit; font: 500 10px var(--mono); opacity: .6; }
.window-app-icon { justify-self: start; color: #3677ce; font-size: 14px; }
.folder-toolbar {
  min-height: 38px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 12px;
  padding: 7px 12px;
  border-bottom: 1px solid #d7dee8;
  background: white;
  color: #657287;
  font-size: 9px;
}
.folder-toolbar b { padding: 4px 8px; border-radius: 6px; background: #f0f3f7; color: #39465a; font-weight: 600; }
.folder-canvas { position: relative; min-height: 268px; padding: 42px 30px; background: linear-gradient(135deg,#f6f8fb,#edf2f7); }
.folder-item { width: 90px; display: grid; justify-items: center; gap: 7px; padding: 9px; border-radius: 9px; color: #263249; font-size: 9px; text-align: center; }
.folder-item.is-selected { background: #cfe2ff; box-shadow: 0 0 0 1px #6aa0e7; }
.folder-shape { position: relative; width: 49px; height: 35px; border-radius: 5px; background: #65a5ed; box-shadow: inset 0 -5px 0 rgba(0,0,0,.08); }
.folder-shape::before { content: ""; position: absolute; top: -6px; left: 3px; width: 22px; height: 10px; border-radius: 4px 4px 0 0; background: #65a5ed; }
.context-menu {
  position: absolute;
  top: 54px;
  left: 113px;
  z-index: 4;
  width: min(190px,calc(100% - 124px));
  display: grid;
  gap: 2px;
  padding: 7px;
  border: 1px solid rgba(55,67,85,.22);
  border-radius: 10px;
  background: rgba(253,254,255,.96);
  box-shadow: 0 15px 38px rgba(20,33,52,.25);
  font-size: 9px;
  backdrop-filter: blur(12px);
}
.context-menu > span,
.context-submenu span { display: flex; justify-content: space-between; padding: 6px 8px; border-radius: 5px; }
.context-menu .menu-target { background: #dbeaff; color: #154f9e; font-weight: 700; }
.context-submenu { position: absolute; top: calc(100% + 6px); right: 0; width: 194px; padding: 7px; border: 1px solid rgba(55,67,85,.22); border-radius: 10px; background: white; box-shadow: 0 12px 32px rgba(20,33,52,.2); }
.mock-cursor { position: absolute; top: 110px; left: 198px; z-index: 7; color: #101b2c; font-size: 17px; filter: drop-shadow(0 1px 0 white); transform: rotate(-30deg); }
.terminal-window { overflow: hidden; background: #071226; color: #eaf2ff; }
.terminal-window-body { min-height: 306px; display: flex; flex-direction: column; gap: 7px; padding: 48px 18px 18px; font: 500 10px/1.5 var(--mono); }
.terminal-window-body code,
.terminal-window-body samp { color: #dfeaff; font: inherit; overflow-wrap: anywhere; }
.terminal-window-body code b { color: #77d5ad; font-weight: 700; }
.terminal-window-body samp { color: #9fb4d1; }
.terminal-muted { color: #7991b2; }
.terminal-caret { width: 7px; height: 14px; margin-top: -21px; margin-left: auto; background: #dfeaff; opacity: .7; }
.agent-opened { max-width: 330px; display: grid; gap: 4px; margin-top: 8px; padding: 14px; border: 1px solid #33527e; border-radius: 10px; background: #0f203a; }
.agent-opened span { color: #95baf0; font-size: 9px; text-transform: uppercase; letter-spacing: .08em; }
.agent-opened strong { color: white; font-family: var(--body); font-size: 13px; }
.agent-opened small { color: #90a7c6; font-family: var(--body); font-size: 9px; }
.launcher-mock { padding: 72px 14%; background: radial-gradient(circle at 28% 22%,#bcd8ff,transparent 28%),linear-gradient(135deg,#d5e5f8,#94a9c4); color: #152137; }
.launcher-mock.is-windows { background: radial-gradient(circle at 70% 30%,#d4eaff,transparent 30%),linear-gradient(135deg,#b9cff0,#7a91b5); }
.launcher-search { display: grid; grid-template-columns: auto 1fr; gap: 10px; align-items: center; padding: 12px 14px; border-radius: 14px; background: rgba(255,255,255,.9); box-shadow: 0 18px 46px rgba(19,37,63,.22); font-size: 11px; }
.launcher-result { display: grid; grid-template-columns: 42px 1fr; gap: 12px; align-items: center; margin-top: 8px; padding: 12px; border-radius: 13px; background: rgba(255,255,255,.84); }
.launcher-result > span { width: 42px; height: 42px; display: grid; place-items: center; border-radius: 11px; background: #182842; color: white; font: 700 15px var(--mono); }
.launcher-result strong,
.launcher-result small { display: block; }
.launcher-result strong { font-size: 11px; }
.launcher-result small { margin-top: 2px; color: #67758a; font-size: 9px; }
.workspace-explanation {
  min-width: 0;
  display: flex;
  flex-direction: column;
  padding: 22px;
  border-radius: 17px;
  background: white;
  color: var(--ink-deep);
  box-shadow: 0 12px 30px rgba(24,39,63,.09);
}
.demo-progress { color: var(--blue-deep); font: 700 9px var(--mono); letter-spacing: .08em; text-transform: uppercase; }
.workspace-explanation h4 { margin: 10px 0 8px; font-family: var(--body); font-size: 19px; font-weight: 700; letter-spacing: -.025em; }
.workspace-explanation > p { color: var(--copy); font-size: 12px; }
.demo-fallback { display: grid; gap: 3px; margin: 4px 0 10px; padding: 9px 10px; border-radius: 10px; background: #fff6e7; }
.demo-fallback[hidden] { display: none; }
.demo-fallback strong { color: #6c4c1f; font-size: 10px; }
.demo-fallback span { color: #6f5a3c; font-size: 10px; }
.demo-command { display: grid; gap: 5px; margin: 5px 0 13px; padding: 11px; border-radius: 11px; background: var(--terminal); }
.demo-command span { color: #819abc; font: 700 8px var(--mono); letter-spacing: .08em; text-transform: uppercase; }
.demo-command code { color: #e9f1ff; font-size: 11px; overflow-wrap: anywhere; }
.demo-result { margin: auto 0 0; padding-top: 14px; border-top: 1px solid var(--line-soft); }
.demo-result strong,
.demo-result span { display: block; }
.demo-result strong { margin-bottom: 5px; color: var(--ink-deep); font-size: 11px; }
.demo-result span { color: var(--copy); font-size: 11px; }
.workspace-demo-steps { display: flex; gap: 7px; margin: 0; padding: 12px 14px 4px; overflow-x: auto; list-style: none; scroll-snap-type: x proximity; }
.workspace-demo-steps li { min-width: 92px; flex: 1 0 92px; scroll-snap-align: start; }
.workspace-demo-steps button { width: 100%; min-height: 48px; display: flex; gap: 8px; align-items: center; padding: 8px 10px; border: 1px solid rgba(255,255,255,.14); border-radius: 10px; background: rgba(255,255,255,.045); color: #b8c9e1; font-size: 10px; font-weight: 700; text-align: left; }
.workspace-demo-steps button span { color: #7491b9; font: 700 8px var(--mono); }
.workspace-demo-steps button[aria-current="step"] { border-color: #9fc2f7; background: #edf4ff; color: var(--ink-deep); }
.workspace-demo-steps button[aria-current="step"] span { color: var(--blue-deep); }
.workspace-demo-note { margin: 0; padding: 8px 16px 14px; color: #8097b8; font-size: 9px; }
.workspace-demo button:focus-visible { outline: 3px solid #f2c969; outline-offset: 2px; }

.permission-guide { overflow: hidden; margin-top: 18px; border: 1px solid var(--line); border-radius: 20px; background: var(--paper-soft); }
.permission-guide header { padding: 18px 20px 13px; }
.permission-guide header > span { display: block; color: var(--blue-deep); font: 700 8px var(--mono); letter-spacing: .08em; text-transform: uppercase; }
.permission-guide h4 { margin: 5px 0 5px; font-family: var(--body); font-size: 19px; font-weight: 700; letter-spacing: -.02em; }
.permission-guide header p { max-width: 68ch; margin: 0; color: var(--copy); font-size: 12px; }
.permission-guide-command { display: grid; grid-template-columns: auto minmax(0,1fr); gap: 12px; align-items: center; padding: 11px 20px; background: var(--terminal); }
.permission-guide-command span { color: #8fa8ca; font: 700 8px var(--mono); letter-spacing: .08em; text-transform: uppercase; }
.permission-guide-command code { color: #e7f0ff; font-size: 11px; overflow-wrap: anywhere; }
.permission-guide-grid { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 1px; background: var(--line-soft); }
.permission-guide-grid > div { padding: 13px 16px; background: white; }
.permission-guide-grid span { display: block; margin-bottom: 4px; color: var(--blue-deep); font: 700 8px var(--mono); letter-spacing: .07em; text-transform: uppercase; }
.permission-guide-grid p { margin: 0; color: var(--copy); font-size: 11px; line-height: 1.48; }

.build-mode-guide { display: grid; grid-template-columns: minmax(220px,.72fr) minmax(0,1.28fr); gap: 22px; align-items: start; margin-top: 18px; padding: 20px; border: 1px solid #d7c69f; border-radius: 20px; background: #fff9ea; }
.build-mode-guide > div > span { display: block; color: #80551e; font: 700 8px var(--mono); letter-spacing: .08em; text-transform: uppercase; }
.build-mode-guide h4 { margin: 5px 0 7px; font-family: var(--body); font-size: 19px; font-weight: 700; letter-spacing: -.02em; }
.build-mode-guide p { margin: 0; color: var(--copy); font-size: 11px; line-height: 1.5; }
.build-mode-guide ol { display: grid; gap: 7px; margin: 0; padding: 0; list-style: none; }
.build-mode-guide li { display: grid; grid-template-columns: 25px 1fr; gap: 9px; align-items: start; color: var(--copy); font-size: 10px; line-height: 1.5; }
.build-mode-guide li b { width: 24px; height: 24px; display: grid; place-items: center; border-radius: 8px; background: #f2dfb5; color: #714817; font: 700 9px var(--mono); }
.build-mode-guide code { color: var(--ink-deep); font-size: .92em; }
.build-mode-details { display: grid; gap: 14px; min-width: 0; }
.build-mode-details .artifact-confirm { margin: 0; background: rgba(255,255,255,.72); }

.step-list { display: grid; gap: 10px; max-width: 850px; margin: 23px 0 0; padding: 0; list-style: none; counter-reset: steps; }
.step-list li { counter-increment: steps; display: grid; grid-template-columns: 34px 1fr; gap: 12px; align-items: start; padding: 15px 17px; border-radius: 17px; background: var(--paper-soft); color: var(--copy); }
.step-list li::before { content: counter(steps); width: 30px; height: 30px; display: grid; place-items: center; border-radius: 9px; background: var(--white); color: var(--blue-deep); font: 700 10px var(--mono); }
.step-list strong { color: var(--ink-deep); }

.prompt-station {
  overflow: hidden;
  margin-bottom: 46px;
  border-radius: 27px;
  background: var(--ink-deep);
  color: var(--white);
}
.prompt-station-header {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 18px;
  align-items: center;
  padding: 23px 25px;
  border-bottom: 1px solid rgba(255,255,255,.12);
}
.prompt-station .eyebrow { color: #94baf2; }
.prompt-station h3 { margin: 0; color: var(--white); font-family: var(--body); font-size: 22px; font-weight: 700; letter-spacing: -.025em; }
.copy-button { min-width: 112px; min-height: 44px; padding: 10px 14px; border: 1px solid rgba(255,255,255,.28); border-radius: 12px; background: rgba(255,255,255,.08); color: white; font-weight: 700; }
.copy-button:hover { background: rgba(255,255,255,.15); }
.prompt-purpose { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 1px; background: rgba(255,255,255,.1); }
.prompt-purpose div { padding: 13px 18px; background: var(--terminal); }
.prompt-purpose span { display: block; margin-bottom: 3px; color: #7796c1; font: 700 8px var(--mono); letter-spacing: .09em; text-transform: uppercase; }
.prompt-purpose p { margin: 0; color: rgba(255,255,255,.77); font-size: 11px; line-height: 1.45; }
.prompt-station details { border-bottom: 1px solid rgba(255,255,255,.1); }
.prompt-station summary { min-height: 44px; padding: 15px 24px; cursor: pointer; color: #b9d1f3; font-size: 12px; font-weight: 700; }
.prompt-station pre { max-height: 390px; margin: 0; padding: 22px 25px 28px; overflow: auto; color: #e5edf9; font-size: 11px; line-height: 1.75; white-space: pre-wrap; }
.after-prompt { display: grid; grid-template-columns: repeat(auto-fit,minmax(130px,1fr)); gap: 1px; background: rgba(255,255,255,.09); }
.after-prompt div { padding: 14px 13px; background: rgba(255,255,255,.035); }
.after-prompt b { display: block; margin-bottom: 5px; color: #9fc2f7; font: 700 8px var(--mono); letter-spacing: .07em; text-transform: uppercase; }
.after-prompt p { margin: 0; color: rgba(255,255,255,.68); font-size: 10px; line-height: 1.45; }

.return-grid { display: grid; grid-template-columns: 1.12fr .88fr; gap: 15px; }
.ai-return,
.maya-check {
  min-width: 0;
  padding: 23px;
  border-radius: 22px;
  border: 1px solid var(--line);
}
.ai-return { background: var(--paper-soft); }
.maya-check { background: #fffaf2; border-color: #e5d7c3; }
.return-label { display: block; margin-bottom: 12px; color: var(--blue-deep); font: 700 9px var(--mono); letter-spacing: .09em; text-transform: uppercase; }
.ai-return h3,
.maya-check h3 { margin-bottom: 10px; font-family: var(--body); font-size: 18px; font-weight: 700; letter-spacing: -.02em; }
.ai-return p,
.maya-check p,
.ai-return li,
.maya-check li { color: var(--copy); font-size: 13px; }
.ai-return ul,
.maya-check ul { margin: 0; padding-left: 19px; }
.ai-return li + li,
.maya-check li + li { margin-top: 7px; }
.artifact-block { margin-top: 14px; padding: 15px; border-radius: 14px; background: white; border: 1px solid var(--line-soft); }
.artifact-block code { display: block; color: var(--ink-deep); font-size: 10px; line-height: 1.65; white-space: pre-wrap; }

.visible-result {
  display: grid;
  grid-template-columns: minmax(0,1fr) minmax(230px,.7fr);
  gap: 17px;
  margin: 46px 0 0;
  padding: 23px;
  border-radius: 25px;
  background: var(--powder);
}
.visible-result h3 { margin-bottom: 8px; font-family: var(--body); font-size: 20px; font-weight: 700; letter-spacing: -.02em; }
.visible-result p { margin: 0; color: var(--copy); font-size: 13px; }
.changed-files { display: flex; flex-wrap: wrap; gap: 7px; align-content: start; }
.changed-files code { padding: 7px 9px; border-radius: 9px; background: rgba(255,255,255,.74); color: var(--blue-deep); font-size: 9px; }

.lesson-footer {
  display: flex;
  justify-content: space-between;
  gap: 13px;
  align-items: center;
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--line-soft);
}
.artifact-confirm {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin: 0 0 16px;
  padding: 14px 16px;
  border-radius: 14px;
  background: var(--paper-soft);
  color: var(--copy);
  font-size: 13px;
}
.artifact-confirm input { width: 18px; height: 18px; margin-top: 1px; accent-color: var(--blue-deep); }
.completion-evidence { margin: 28px 0 0; padding: 20px; border: 1px solid var(--line-soft); border-radius: 20px; background: var(--white); }
.completion-evidence h3 { margin: 0 0 5px; font-size: 21px; }
.completion-evidence > p { margin: 0 0 16px; color: var(--muted); font-size: 12px; }
.completion-evidence .artifact-confirm:last-child { margin-bottom: 0; }
.complete-gate { margin: 0 0 16px; color: var(--muted); font-size: 12px; }
.lesson-footer button { min-height: 46px; padding: 10px 17px; border-radius: 12px; border: 1px solid var(--line); background: var(--white); color: var(--ink-deep); font-weight: 700; }
.lesson-footer button:hover { background: var(--paper-soft); }
.lesson-footer button:disabled { cursor: not-allowed; opacity: .48; }
.lesson-footer .complete-button { margin-left: auto; border-color: var(--ink-deep); background: var(--ink-deep); color: white; }
.lesson-footer .complete-button.is-complete { border-color: var(--sage-deep); background: var(--sage-deep); }

.project-dock { padding: 20px; }
.project-dock header { padding-bottom: 17px; border-bottom: 1px solid var(--line-soft); }
.project-dock h2 { margin-bottom: 6px; font-size: 27px; line-height: 1; }
.project-dock header > span { display: inline-flex; padding: 5px 8px; border-radius: 99px; background: var(--powder); color: var(--blue-deep); font: 700 8px var(--mono); text-transform: uppercase; }
.folder-tree { padding: 17px 0; font: 400 10px/1.75 var(--mono); }
.tree-row { display: grid; grid-template-columns: 17px minmax(0,1fr); gap: 6px; align-items: start; color: var(--muted); }
.tree-row span:last-child { overflow-wrap: anywhere; }
.tree-row.is-root { color: var(--ink-deep); font-weight: 700; }
.tree-row.is-new { color: var(--blue-deep); animation: tree-in .35s var(--fz-ease-enter); }
.tree-row .tree-icon { color: var(--blue); }
.tree-indent-1 { padding-left: 14px; }
.tree-indent-2 { padding-left: 28px; }
.dock-note { padding: 13px 14px; border-radius: 14px; background: var(--paper-soft); color: var(--copy); font-size: 11px; line-height: 1.5; }
.shortcut-drawer { margin-top: 13px; border-top: 1px solid var(--line-soft); }
.shortcut-drawer summary { min-height: 44px; padding: 15px 2px 4px; cursor: pointer; color: var(--blue-deep); font-size: 11px; font-weight: 700; }
.shortcut-drawer dl { margin-bottom: 0; }
.shortcut-drawer dl div { display: grid; grid-template-columns: 54px 1fr; gap: 8px; padding: 8px 0; border-bottom: 1px solid var(--line-soft); }
.shortcut-drawer dt { color: var(--ink-deep); font: 700 10px var(--mono); }
.shortcut-drawer dd { margin: 0; color: var(--muted); font-size: 10px; }

.boundary {
  display: grid;
  grid-template-columns: minmax(0,.65fr) minmax(0,1.35fr);
  gap: 48px;
  margin-bottom: 70px;
  padding: clamp(34px,5vw,66px);
  border-radius: 36px;
  background: #fff8f1;
  border: 1px solid #ead7c9;
}
.boundary h2 { max-width: 10ch; margin: 0; font-size: clamp(42px,4.8vw,70px); line-height: .98; }
.boundary-copy { align-self: center; }
.boundary-copy p { max-width: 70ch; color: var(--copy); }
.boundary-copy p:last-child { margin-bottom: 0; }

.source-note { margin-bottom: 80px; }
.source-note details { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.source-note summary { min-height: 44px; padding: 18px 0; cursor: pointer; color: var(--blue-deep); font-weight: 700; }
.source-note details > div { max-width: 88ch; padding-bottom: 20px; color: var(--copy); font-size: 12px; }
.source-note a { color: var(--blue-deep); font-weight: 700; }

.site-footer { padding: 44px 0; background: var(--ink-deep); color: white; }
.footer-inner { display: flex; justify-content: space-between; align-items: center; }
.footer-inner p { margin: 12px 0 0; color: rgba(255,255,255,.55); font-size: 12px; }
.noscript { margin: 0; padding: 14px; background: #fff0d7; color: var(--ink-deep); text-align: center; }
.reset-dialog {
  width: min(500px, calc(100vw - 28px));
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 25px;
  background: var(--white);
  color: var(--ink);
  box-shadow: 0 30px 100px rgba(6,15,38,.38);
}
.reset-dialog::backdrop { background: rgba(6,15,38,.62); backdrop-filter: blur(4px); }
.reset-dialog > div { padding: 28px; }
.reset-dialog h2 { margin-bottom: 12px; font-size: 42px; line-height: 1; }
.reset-dialog p:not(.eyebrow) { color: var(--copy); }
.reset-dialog-actions { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 10px; margin-top: 24px; }
.reset-dialog-actions button { min-height: 44px; padding: 10px 15px; border: 1px solid var(--line); border-radius: 11px; background: white; color: var(--ink-deep); font-weight: 700; }
.reset-dialog-actions #confirmReset { border-color: var(--ink-deep); background: var(--ink-deep); color: white; }
.toast {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 100;
  width: min(330px, calc(100vw - 24px));
  padding: 12px 15px;
  transform: translateY(160%);
  border-radius: 13px;
  background: var(--ink-deep);
  color: white;
  box-shadow: 0 18px 48px rgba(6,15,38,.3);
  font-size: 12px;
  pointer-events: none;
  transition: transform var(--fz-duration-medium) var(--fz-ease-enter);
}
.toast.is-visible { transform: translateY(0); }

.resume-chain {
  border-top: 1px solid rgba(255,255,255,.18);
  background: #f7f1e8;
  color: var(--ink-deep);
}
.resume-chain > header {
  display: grid;
  grid-template-columns: auto minmax(0,1fr);
  gap: 14px;
  align-items: baseline;
  padding: 16px 18px 14px;
}
.resume-chain > header span {
  color: var(--blue-deep);
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: .11em;
  text-transform: uppercase;
}
.resume-chain > header p {
  margin: 0;
  color: var(--copy);
  font-size: 11px;
}
.prompt-station .resume-chain details {
  border-top: 1px solid #ddd6ca;
  border-bottom: 0;
  background: rgba(255,255,255,.42);
}
.prompt-station .resume-chain summary {
  padding: 14px 18px;
  color: var(--ink-deep);
  font-size: 12px;
}
.resume-step { padding: 0 18px 18px; }
.resume-step > p {
  margin: 0 0 11px;
  color: var(--copy);
  font-size: 11px;
}
.resume-step .resume-edit-note {
  padding: 9px 11px;
  border-left: 3px solid var(--blue);
  background: #eaf2ff;
  color: var(--ink-deep);
}
.prompt-station .resume-step textarea {
  display: block;
  width: 100%;
  min-height: 150px;
  max-height: 260px;
  resize: vertical;
  margin: 0 0 12px;
  padding: 16px;
  border: 1px solid #d8d0c4;
  border-radius: 10px;
  background: white;
  color: var(--ink-deep);
  font-family: var(--mono);
  font-size: 11px;
  line-height: 1.65;
}
.prompt-station .resume-step textarea:focus {
  outline: 3px solid rgba(42,91,180,.24);
  border-color: var(--blue);
}
.resume-step button {
  min-height: 44px;
  padding: 9px 13px;
  border: 0;
  border-radius: 9px;
  background: var(--blue-deep);
  color: white;
  font-size: 11px;
  font-weight: 800;
}

@keyframes tree-in {
  from { opacity: 0; transform: translateX(-5px); }
  to { opacity: 1; transform: translateX(0); }
}

@media (max-width: 1360px) {
  .course-shell { grid-template-columns: 220px minmax(0,1fr); }
  .project-dock {
    position: relative;
    top: auto;
    grid-column: 1 / -1;
    max-height: none;
    display: grid;
    grid-template-columns: 250px minmax(0,1fr) 270px;
    gap: 20px;
    align-items: start;
  }
  .project-dock header { border-bottom: 0; border-right: 1px solid var(--line-soft); padding: 5px 20px 5px 0; }
  .folder-tree { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 2px 16px; padding: 2px 0; }
  .dock-note { align-self: center; }
  .shortcut-drawer { grid-column: 1/-1; }
}

@media (max-width: 1040px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-copy { max-width: 850px; }
  .hero-system { max-width: 780px; margin-left: auto; margin-right: auto; }
  .course-premise { grid-template-columns: 1fr; }
  .course-premise h2 { max-width: 13ch; }
  .route-grid { grid-template-columns: 1fr; }
  .terminal-needs { grid-template-columns: minmax(230px,.8fr) minmax(0,1.2fr); }
  .setup-choices { grid-template-columns: 1fr; }
  .chapter-rail { display: none; }
  .course-shell { grid-template-columns: 1fr; }
  .mobile-course-nav {
    display: grid;
    grid-template-columns: auto minmax(0,1fr) auto auto;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
    padding: 11px 13px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: white;
  }
  .mobile-course-nav label,
  .mobile-course-nav span { color: var(--muted); font-size: 10px; font-weight: 700; }
  .mobile-course-nav button { min-height: 44px; padding: 7px 9px; border: 0; border-radius: 8px; background: var(--paper-soft); color: var(--blue-deep); font-size: 10px; font-weight: 700; }
  .mobile-course-nav select { min-height: 44px; padding: 7px; border: 1px solid var(--line); border-radius: 9px; background: white; color: var(--ink); }
  .project-dock { grid-template-columns: 1fr 1fr; }
  .project-dock header { border-right: 0; border-bottom: 1px solid var(--line-soft); }
  .dock-note { grid-column: 1/-1; }
}

@media (max-width: 760px) {
  :root { --wide: min(100% - 24px, 1540px); }
  .header-inner { grid-template-columns: 1fr auto; }
  .header-inner > p { display: none; }
  .hero { padding-top: 52px; }
  .hero h1 { font-size: clamp(50px,14vw,72px); }
  .hero-facts { grid-template-columns: 1fr; gap: 9px; }
  .hero-facts div { display: grid; grid-template-columns: 105px 1fr; gap: 10px; }
  .system-body { grid-template-columns: 1fr; min-height: 0; }
  .hero-tree { display: none; }
  .hero-system { padding-left: 0; }
  .hero-system figcaption { right: 6px; width: 92%; }
  .course-premise { margin-top: -16px; padding: 28px 22px; }
  .course-premise ol { grid-template-columns: 1fr; }
  .section-heading h2 { font-size: clamp(43px,12vw,64px); }
  .tool-setup { width: 100%; border-radius: 0; padding: 42px 18px; }
  .terminal-value-compare { grid-template-columns: 1fr; }
  .terminal-value-compare article + article { border-top: 1px solid rgba(255,255,255,.13); border-left: 0; }
  .terminal-value-result { grid-template-columns: 1fr; gap: 8px; }
  .terminal-needs { grid-template-columns: 1fr; }
  .terminal-needs figure { min-height: 230px; }
  .terminal-needs figure img { min-height: 230px; max-height: 270px; }
  .terminal-needs-copy { padding: 23px 20px 21px; }
  .terminal-needs-copy ul { grid-template-columns: 1fr; gap: 0; padding: 0; border-top: 1px solid #ddd6ca; background: transparent; }
  .terminal-needs-copy li { grid-template-columns: 27px 1fr; gap: 10px; padding: 10px 0; border-bottom: 1px solid #ddd6ca; background: transparent; }
  .installation-handoff > header { grid-template-columns: 1fr; gap: 10px; }
  .installation-handoff ol { grid-template-columns: repeat(2,minmax(0,1fr)); }
  .installation-handoff li:last-child { grid-column: 1 / -1; }
  .app-fallback-options { grid-template-columns: 1fr; }
  .tool-picker { grid-template-columns: 1fr; }
  .platform-picker button,
  .tool-picker button { min-height: 58px; }
  .preflight-header { grid-template-columns: 1fr; }
  .preflight-count { justify-self: start; }
  .preflight-support-body,
  .preflight-faqs > div { grid-template-columns: 1fr; }
  .workspace-demo-header { grid-template-columns: 1fr; }
  .workspace-demo-header button { width: 100%; }
  .workspace-demo-stage { grid-template-columns: 1fr; }
  .workspace-explanation { min-height: 245px; }
  .lesson-opening { grid-template-columns: 1fr; }
  .lesson-scene { min-height: 280px; }
  .lesson-scene img { min-height: 280px; max-height: 340px; }
  #lessonTitle { font-size: clamp(43px,12vw,64px); }
  .lesson-body { padding: 28px 18px 34px; }
  .lesson-section > h3 { font-size: 39px; }
  .command-vs-prompt,
  .permission-guide-grid,
  .build-mode-guide,
  .return-grid,
  .visible-result { grid-template-columns: 1fr; }
  .prompt-station-header { grid-template-columns: 1fr; }
  .copy-button { width: 100%; }
  .prompt-purpose { grid-template-columns: 1fr; }
  .after-prompt { grid-template-columns: 1fr; }
  .prompt-station pre { max-height: 330px; padding-inline: 18px; font-size: 12px; }
  .resume-chain > header { grid-template-columns: 1fr; gap: 5px; }
  .resume-step button { width: 100%; }
  .project-dock { grid-template-columns: 1fr; }
  .folder-tree { grid-template-columns: 1fr; }
  .dock-note { grid-column: auto; }
  .boundary { grid-template-columns: 1fr; gap: 24px; padding: 34px 22px; }
  .lesson-footer { flex-wrap: wrap; }
  .lesson-footer .complete-button { width: 100%; order: -1; }
}

@media (max-width: 480px) {
  .header-path { display: none; }
  .header-inner { grid-template-columns: 1fr; }
  .hero-actions .button { width: 100%; }
  .hero-system figcaption { position: relative; right: auto; bottom: auto; width: 100%; margin-top: 12px; }
  .hero-system { padding-bottom: 0; }
  .route-card header,
  .route-card ol { padding-left: 20px; padding-right: 20px; }
  .installation-handoff > header { padding: 21px 19px 17px; }
  .installation-handoff ol { grid-template-columns: 1fr; }
  .installation-handoff li:last-child { grid-column: auto; }
  .installation-boundary { padding: 13px 19px; }
  .provider-boundary { padding: 13px 19px; }
  .app-fallback > summary { grid-template-columns: minmax(0,1fr) auto; gap: 12px; }
  .mobile-course-nav { grid-template-columns: 1fr; }
  .mobile-course-nav label { display: none; }
  .lesson { border-radius: 22px; }
  .preflight-copy { padding: 18px; }
  .preflight-command { grid-template-columns: 1fr; }
  .preflight-command button { width: 100%; }
  .preflight-footer .preflight-next { margin-left: 0; }
  .preflight-footer button,
  .preflight-footer a { flex: 1 1 100%; }
  .workspace-demo-toolbar { display: grid; }
  .workspace-demo-stage { padding: 8px; }
  .demo-toggle { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); }
  .workspace-screen,
  .folder-window,
  .terminal-window,
  .launcher-mock { min-height: 270px; }
  .folder-canvas { min-height: 198px; padding: 34px 18px; }
  .computer-mock-label { top: 45px; right: 8px; }
  .folder-item { width: 76px; }
  .context-menu { top: 45px; left: 88px; width: calc(100% - 96px); font-size: 8px; }
  .context-submenu { width: 172px; }
  .mock-cursor { top: 100px; left: 160px; }
  .terminal-window-body { min-height: 236px; padding: 43px 13px 13px; font-size: 9px; }
  .launcher-mock { padding: 62px 8%; }
  .workspace-explanation { min-height: 0; padding: 18px; }
}

@media (pointer: coarse), (max-width: 760px) {
  button,
  select,
  summary,
  .button,
  .preflight-footer a { min-height: 44px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  .system-window { transform: none; }
}