:root {
  color-scheme: dark;
  --bg: #050607;
  --panel: #0a0b0d;
  --panel-2: #0d0f12;
  --panel-3: #111318;
  --line: rgba(255, 255, 255, 0.11);
  --line-strong: rgba(255, 255, 255, 0.2);
  --text: #f5f7fa;
  --muted: #9aa1aa;
  --dim: #626974;
  --blue: #6cb8ff;
  --green: #52df9d;
  --yellow: #f4c84c;
  --red: #ff6673;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Consolas, monospace;
  --sans: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --max: 1220px;
  --radius: 18px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 104px;
  background: var(--bg);
}

body {
  margin: 0;
  min-width: 320px;
  overflow-x: hidden;
  background:
    radial-gradient(circle at 84% 7%, rgba(108, 184, 255, 0.07), transparent 24rem),
    radial-gradient(circle at 10% 22%, rgba(82, 223, 157, 0.035), transparent 28rem),
    var(--bg);
  color: var(--text);
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
}

html.guide-dialog-open,
html.guide-dialog-open body {
  overflow: hidden;
}

a {
  color: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button {
  font: inherit;
}

img {
  display: block;
  max-width: 100%;
}

.skip-link {
  position: fixed;
  z-index: 1000;
  top: 10px;
  left: 10px;
  transform: translateY(-150%);
  padding: 10px 14px;
  background: #fff;
  color: #000;
  font: 700 12px var(--mono);
  text-decoration: none;
}

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

.site-header {
  position: relative;
  z-index: 20;
  border-bottom: 1px solid var(--line);
  background: rgba(5, 6, 7, 0.9);
  backdrop-filter: blur(18px);
}

.guide-progress {
  position: absolute;
  z-index: 2;
  right: 0;
  bottom: -1px;
  left: 0;
  height: 2px;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.035);
  pointer-events: none;
}

.guide-progress span {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: left center;
  background: linear-gradient(90deg, var(--blue), var(--green));
  will-change: transform;
}

.site-header-inner {
  width: min(var(--max), calc(100% - 40px));
  min-height: 74px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  min-width: 0;
}

.brand img {
  width: 47px;
  height: 28px;
  object-fit: contain;
}

.brand-name {
  font: 700 15px var(--mono);
  letter-spacing: 0.22em;
  white-space: nowrap;
}

.brand-divider {
  color: var(--dim);
}

.brand-product {
  color: #b5bac2;
  font: 600 12px var(--mono);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  white-space: nowrap;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 9px;
}

.header-link {
  min-height: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: 9px;
  color: #c6cbd2;
  font: 700 10px var(--mono);
  letter-spacing: 0.12em;
  text-decoration: none;
  text-transform: uppercase;
  transition: border-color 160ms ease, color 160ms ease, background 160ms ease;
}

.header-link:hover,
.header-link:focus-visible {
  border-color: var(--line-strong);
  background: rgba(255, 255, 255, 0.035);
  color: #fff;
}

.header-link.primary {
  border-color: rgba(108, 184, 255, 0.45);
  background: rgba(108, 184, 255, 0.08);
  color: #d8ecff;
}

.hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(90deg, transparent 49.9%, rgba(255, 255, 255, 0.035) 50%, transparent 50.1%),
    linear-gradient(rgba(255, 255, 255, 0.025) 1px, transparent 1px);
  background-size: 100% 100%, 100% 64px;
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.72), transparent 88%);
}

.hero-inner {
  position: relative;
  width: min(var(--max), calc(100% - 40px));
  margin: 0 auto;
  padding: 86px 0 68px;
}

.eyebrow {
  margin: 0 0 18px;
  color: var(--blue);
  font: 700 10px var(--mono);
  letter-spacing: 0.25em;
  text-transform: uppercase;
}

.eyebrow::before {
  content: "";
  display: inline-block;
  width: 28px;
  height: 1px;
  margin-right: 12px;
  vertical-align: middle;
  background: currentColor;
}

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

.hero h1 {
  max-width: 920px;
  margin-bottom: 24px;
  font-size: clamp(48px, 7vw, 92px);
  line-height: 0.94;
  letter-spacing: -0.06em;
}

.hero-copy {
  max-width: 760px;
  margin-bottom: 30px;
  color: #b3bac3;
  font-size: clamp(17px, 2vw, 21px);
  line-height: 1.65;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.button {
  min-height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 0 18px;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.025);
  color: #fff;
  font: 700 11px var(--mono);
  letter-spacing: 0.12em;
  text-decoration: none;
  text-transform: uppercase;
}

.button.primary {
  border-color: #fff;
  background: #fff;
  color: #050607;
}

.button:hover,
.button:focus-visible {
  transform: translateY(-1px);
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  max-width: 900px;
  margin-top: 54px;
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
  background: rgba(6, 7, 9, 0.82);
}

.hero-stat {
  min-height: 92px;
  padding: 18px 20px;
  border-right: 1px solid var(--line);
}

.hero-stat:last-child {
  border-right: 0;
}

.hero-stat strong {
  display: block;
  margin-bottom: 7px;
  font: 700 20px var(--mono);
  letter-spacing: -0.04em;
}

.hero-stat span {
  color: var(--muted);
  font-size: 12px;
  line-height: 1.45;
}

.context-strip {
  border-bottom: 1px solid var(--line);
  background: #07080a;
}

.context-strip-inner {
  width: min(var(--max), calc(100% - 40px));
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.context-card {
  min-height: 128px;
  padding: 25px 30px;
  border-right: 1px solid var(--line);
}

.context-card:first-child {
  border-left: 1px solid var(--line);
}

.context-label {
  display: block;
  margin-bottom: 10px;
  color: var(--dim);
  font: 700 9px var(--mono);
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.context-card strong {
  display: block;
  margin-bottom: 8px;
  font-size: 15px;
}

.context-card p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.55;
}

.guide-library {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(circle at 85% 0%, rgba(80, 151, 255, 0.08), transparent 32%),
    linear-gradient(180deg, #08090b 0%, #050607 100%);
}

.guide-library-inner {
  width: min(var(--max), calc(100% - 40px));
  margin: 0 auto;
  padding: 86px 0 72px;
}

.guide-library-head {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(320px, 0.65fr);
  align-items: end;
  gap: clamp(40px, 8vw, 120px);
  margin-bottom: 36px;
}

.guide-library-head h2 {
  max-width: 720px;
  font-size: clamp(38px, 5vw, 66px);
  line-height: 0.98;
  letter-spacing: -0.055em;
}

.guide-library-head > p {
  max-width: 600px;
  margin: 0 0 4px;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.75;
}

.guide-library-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.guide-card {
  min-width: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(5, 6, 8, 0.86);
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
}

.guide-card:hover,
.guide-card:focus-within {
  transform: translateY(-3px);
  border-color: rgba(255, 255, 255, 0.22);
  background: rgba(10, 12, 15, 0.96);
}

.guide-card-visual {
  position: relative;
  display: block;
  aspect-ratio: 16 / 8.6;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background: #0b0d10;
}

.guide-card-visual::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg, transparent 45%, rgba(4, 5, 7, 0.56));
}

.guide-card-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  filter: saturate(0.9) contrast(1.04);
  transition: transform 260ms ease, filter 260ms ease;
}

.guide-card:hover .guide-card-visual img,
.guide-card:focus-within .guide-card-visual img {
  transform: scale(1.02);
  filter: saturate(1) contrast(1.06);
}

.guide-card-number {
  position: absolute;
  z-index: 1;
  top: 12px;
  left: 12px;
  display: grid;
  place-items: center;
  width: 34px;
  height: 27px;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 7px;
  background: rgba(4, 5, 7, 0.86);
  color: #fff;
  font: 700 9px var(--mono);
  letter-spacing: 0.12em;
  backdrop-filter: blur(10px);
}

.guide-card-copy {
  padding: 22px 22px 24px;
}

.guide-card-meta {
  display: block;
  margin-bottom: 9px;
  color: var(--blue);
  font: 700 8px var(--mono);
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.guide-card h3 {
  margin-bottom: 10px;
  font-size: 23px;
  letter-spacing: -0.035em;
}

.guide-card h3 a {
  color: #fff;
  text-decoration: none;
}

.guide-card p {
  min-height: 66px;
  margin: 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.65;
}

.guide-card-link {
  display: inline-flex;
  gap: 8px;
  margin-top: 18px;
  color: #d9dde3;
  font: 700 8px var(--mono);
  letter-spacing: 0.12em;
  text-decoration: none;
  text-transform: uppercase;
}

.guide-card-link span {
  color: var(--blue);
}

.guide-reading-key {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin-top: 30px;
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.018);
}

.guide-key {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 12px;
  padding: 19px;
  border-right: 1px solid var(--line);
}

.guide-key:last-child {
  border-right: 0;
}

.guide-key > span {
  color: var(--dim);
  font: 700 9px var(--mono);
  letter-spacing: 0.12em;
}

.guide-key p {
  margin: 0;
  color: var(--muted);
  font-size: 11px;
  line-height: 1.55;
}

.guide-key strong {
  display: block;
  margin-bottom: 4px;
  color: #fff;
  font-size: 12px;
}

.guide-utility-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 18px;
  margin-top: 24px;
  padding: 0 2px;
}

.guide-utility-links span {
  color: var(--dim);
  font: 700 8px var(--mono);
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.guide-utility-links a {
  color: #b7bdc6;
  font: 700 9px var(--mono);
  letter-spacing: 0.08em;
  text-decoration: none;
  text-transform: uppercase;
}

.guide-utility-links a:hover,
.guide-utility-links a:focus-visible {
  color: #fff;
}

.guide-switcher {
  border-bottom: 1px solid var(--line);
  background: #070809;
}

.guide-switcher-inner {
  width: min(var(--max), 100%);
  min-height: 48px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 4px;
  overflow-x: auto;
  padding: 7px 12px;
  scrollbar-width: none;
}

.guide-switcher-inner::-webkit-scrollbar {
  display: none;
}

.guide-switcher-label {
  flex: 0 0 auto;
  margin-right: 8px;
  color: #5f6670;
  font: 700 8px var(--mono);
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.guide-switcher a {
  flex: 0 0 auto;
  min-height: 32px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 11px;
  border: 1px solid transparent;
  border-radius: 8px;
  color: #858c96;
  font: 700 8px var(--mono);
  letter-spacing: 0.1em;
  text-decoration: none;
  text-transform: uppercase;
}

.guide-switcher a:hover,
.guide-switcher a:focus-visible {
  border-color: var(--line);
  color: #fff;
}

.guide-switcher a[aria-current="page"] {
  border-color: rgba(108, 184, 255, 0.35);
  background: rgba(108, 184, 255, 0.075);
  color: #d8ecff;
}

.chapter-nav {
  position: sticky;
  z-index: 15;
  top: 0;
  border-bottom: 1px solid var(--line);
  background: rgba(5, 6, 7, 0.94);
  backdrop-filter: blur(18px);
}

.chapter-nav-inner {
  width: min(var(--max), 100%);
  margin: 0 auto;
  display: flex;
  gap: 2px;
  overflow-x: auto;
  scrollbar-width: none;
  padding: 8px 12px;
}

.chapter-nav-inner::-webkit-scrollbar {
  display: none;
}

.chapter-nav a {
  flex: 0 0 auto;
  padding: 10px 12px;
  border-radius: 8px;
  color: #8c929b;
  font: 700 9px var(--mono);
  letter-spacing: 0.13em;
  text-decoration: none;
  text-transform: uppercase;
}

.chapter-nav a:hover,
.chapter-nav a:focus-visible,
.chapter-nav a[aria-current="true"] {
  background: rgba(255, 255, 255, 0.05);
  color: #fff;
}

.guide-main {
  width: min(var(--max), calc(100% - 40px));
  margin: 0 auto;
}

.chapter {
  display: grid;
  grid-template-columns: minmax(220px, 0.34fr) minmax(0, 1fr);
  gap: clamp(38px, 7vw, 96px);
  padding: 90px 0;
  border-bottom: 1px solid var(--line);
}

.chapter:last-child {
  border-bottom: 0;
}

.chapter-intro {
  align-self: start;
  position: sticky;
  top: 88px;
}

.chapter-kicker {
  display: block;
  margin-bottom: 13px;
  color: var(--blue);
  font: 700 9px var(--mono);
  letter-spacing: 0.22em;
  text-transform: uppercase;
}

.chapter h2 {
  margin-bottom: 18px;
  font-size: clamp(31px, 4vw, 49px);
  line-height: 1.02;
  letter-spacing: -0.045em;
}

.chapter-lead {
  margin-bottom: 24px;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.72;
}

.chapter-links {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 8px;
}

.chapter-links a {
  color: #b7bdc6;
  font: 700 9px var(--mono);
  letter-spacing: 0.12em;
  text-decoration: none;
  text-transform: uppercase;
}

.chapter-links a::after {
  content: " →";
  color: var(--blue);
}

.chapter-body {
  min-width: 0;
}

.prose {
  max-width: 820px;
  color: #bdc3cb;
  font-size: 15px;
  line-height: 1.8;
}

.prose strong {
  color: #fff;
}

.section-title {
  margin: 38px 0 14px;
  font-size: 21px;
  line-height: 1.25;
  letter-spacing: -0.025em;
}

.section-title:first-child {
  margin-top: 0;
}

.detail-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 24px 0;
}

.detail-card {
  min-height: 150px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.025), transparent);
}

.detail-card .num {
  display: block;
  margin-bottom: 28px;
  color: var(--dim);
  font: 700 9px var(--mono);
  letter-spacing: 0.16em;
}

.detail-card h3 {
  margin-bottom: 8px;
  font-size: 15px;
}

.detail-card p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.6;
}

.signal-state-table,
.field-table {
  width: 100%;
  margin: 26px 0;
  border-collapse: separate;
  border-spacing: 0;
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
  font-size: 13px;
}

.signal-state-table th,
.signal-state-table td,
.field-table th,
.field-table td {
  padding: 15px 17px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.signal-state-table tr:last-child td,
.field-table tr:last-child td {
  border-bottom: 0;
}

.signal-state-table th,
.field-table th {
  background: #0c0e11;
  color: #777f89;
  font: 700 9px var(--mono);
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.signal-state-table td,
.field-table td {
  color: #b8bec7;
  line-height: 1.55;
}

.state {
  display: inline-flex;
  align-items: center;
  min-height: 25px;
  padding: 0 8px;
  border: 1px solid var(--line-strong);
  border-radius: 3px;
  color: #dfe3e8;
  font: 700 9px var(--mono);
  letter-spacing: 0.1em;
  white-space: nowrap;
  text-transform: uppercase;
}

.state.blue {
  border-color: rgba(108, 184, 255, 0.52);
  color: var(--blue);
}

.state.green {
  border-color: rgba(82, 223, 157, 0.5);
  color: var(--green);
}

.state.yellow {
  border-color: rgba(244, 200, 76, 0.52);
  color: var(--yellow);
}

.state.red {
  border-color: rgba(255, 102, 115, 0.52);
  color: var(--red);
}

.state.gray {
  color: #8b929c;
}

.workflow {
  margin: 26px 0;
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
}

.workflow-step {
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr);
  border-bottom: 1px solid var(--line);
}

.workflow-step:last-child {
  border-bottom: 0;
}

.workflow-num {
  min-height: 84px;
  display: grid;
  place-items: center;
  border-right: 1px solid var(--line);
  color: var(--blue);
  font: 700 11px var(--mono);
}

.workflow-copy {
  padding: 18px 20px;
}

.workflow-copy strong {
  display: block;
  margin-bottom: 6px;
  font-size: 14px;
}

.workflow-copy p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.6;
}

.note {
  margin: 26px 0;
  padding: 18px 20px;
  border: 1px solid rgba(108, 184, 255, 0.22);
  border-left: 3px solid var(--blue);
  border-radius: 9px;
  background: rgba(108, 184, 255, 0.045);
  color: #bec7d2;
  font-size: 13px;
  line-height: 1.65;
}

.note.warning {
  border-color: rgba(244, 200, 76, 0.23);
  border-left-color: var(--yellow);
  background: rgba(244, 200, 76, 0.035);
}

.note strong {
  color: #fff;
}

.tour-shot {
  margin: 34px 0 12px;
}

.shot-frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line-strong);
  border-radius: 14px;
  background: #030405;
  box-shadow: 0 28px 80px rgba(0, 0, 0, 0.38);
}

.shot-frame::before {
  content: "";
  position: absolute;
  z-index: 2;
  inset: 0;
  pointer-events: none;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.035);
}

.shot-frame img {
  width: 100%;
  height: auto;
}

.shot-open {
  position: absolute;
  z-index: 5;
  top: 12px;
  right: 12px;
  min-height: 35px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 0 11px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 7px;
  background: rgba(5, 6, 7, 0.86);
  color: #fff;
  cursor: pointer;
  font: 700 8px var(--mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  backdrop-filter: blur(12px);
}

.screen-device-label {
  display: none;
}

.pin {
  position: absolute;
  z-index: 4;
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  transform: translate(-50%, -50%);
  border: 1px solid #fff;
  border-radius: 50%;
  background: rgba(5, 6, 7, 0.93);
  color: #fff;
  cursor: pointer;
  font: 700 10px var(--mono);
  box-shadow: 0 0 0 5px rgba(5, 6, 7, 0.5), 0 8px 28px rgba(0, 0, 0, 0.45);
}

.pin:hover,
.pin:focus-visible,
.pin[aria-pressed="true"] {
  border-color: var(--blue);
  background: var(--blue);
  color: #050607;
}

.shot-caption {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  margin-top: 14px;
  color: #858c95;
  font-size: 12px;
  line-height: 1.55;
}

.shot-caption strong {
  color: #d8dde3;
}

.shot-caption .screen-note {
  flex: 0 0 auto;
  color: #59616b;
  font: 700 8px var(--mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.callouts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  margin-top: 16px;
}

.callout {
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  gap: 10px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: rgba(255, 255, 255, 0.018);
  color: #8e959e;
  font-size: 12px;
  line-height: 1.55;
}

.callout[aria-current="true"] {
  border-color: rgba(108, 184, 255, 0.36);
  background: rgba(108, 184, 255, 0.045);
  color: #c7d0da;
}

.callout b {
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  color: #fff;
  font: 700 9px var(--mono);
}

.mobile-gallery {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  align-items: start;
  margin-top: 30px;
}

.mobile-gallery .tour-shot {
  margin: 0;
}

.mobile-gallery .shot-frame {
  max-width: 390px;
  margin: 0 auto;
  border-radius: 24px;
}

.mobile-gallery .shot-caption {
  display: block;
}

.mobile-gallery .screen-note {
  display: block;
  margin-top: 7px;
}

.faq-list {
  margin-top: 22px;
  border-top: 1px solid var(--line);
}

.faq-list details {
  border-bottom: 1px solid var(--line);
}

.faq-list summary {
  position: relative;
  padding: 19px 40px 19px 0;
  cursor: pointer;
  color: #e4e8ed;
  font-size: 14px;
  font-weight: 650;
  list-style: none;
}

.faq-list summary::-webkit-details-marker {
  display: none;
}

.faq-list summary::after {
  content: "+";
  position: absolute;
  top: 18px;
  right: 4px;
  color: var(--blue);
  font: 700 15px var(--mono);
}

.faq-list details[open] summary::after {
  content: "−";
}

.faq-list p {
  max-width: 760px;
  margin: -3px 0 20px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.7;
}

.closing {
  padding: 90px 0 110px;
  text-align: center;
}

.closing h2 {
  max-width: 760px;
  margin: 0 auto 18px;
  font-size: clamp(38px, 5vw, 66px);
  line-height: 1;
  letter-spacing: -0.05em;
}

.closing p {
  max-width: 680px;
  margin: 0 auto 28px;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.7;
}

.site-footer {
  border-top: 1px solid var(--line);
  background: #050607;
}

.site-footer-inner {
  width: min(var(--max), calc(100% - 40px));
  min-height: 110px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  color: #6c737d;
  font-size: 11px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

.footer-links a {
  color: #9299a2;
  text-decoration: none;
}

.screen-dialog {
  width: min(96vw, 1680px);
  max-height: 94vh;
  padding: 0;
  border: 1px solid rgba(255, 255, 255, 0.23);
  border-radius: 15px;
  overflow: hidden;
  background: #050607;
  color: #fff;
  box-shadow: 0 40px 140px rgba(0, 0, 0, 0.78);
}

.screen-dialog[open] {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
}

.screen-dialog::backdrop {
  background: rgba(0, 0, 0, 0.88);
  backdrop-filter: blur(8px);
}

.dialog-head {
  min-height: 58px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 0 17px;
  border-bottom: 1px solid var(--line);
  background: #090a0c;
}

.dialog-title {
  color: #bdc4cd;
  font: 700 10px var(--mono);
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.dialog-close {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: transparent;
  color: #fff;
  cursor: pointer;
}

.dialog-body {
  min-height: 0;
  overflow: auto;
  background: #020303;
  cursor: zoom-in;
  overscroll-behavior: contain;
}

.dialog-body img {
  width: 100%;
  height: auto;
  margin: 0 auto;
  transform-origin: top left;
}

.dialog-body.is-zoomed {
  cursor: zoom-out;
}

.dialog-body.is-zoomed img {
  width: auto;
  max-width: none;
  min-width: max(1180px, 125vw);
}

.dialog-nav {
  min-height: 54px;
  display: grid;
  grid-template-columns: minmax(92px, 1fr) auto auto minmax(92px, 1fr);
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-top: 1px solid var(--line);
  background: #090a0c;
}

.dialog-nav button {
  min-height: 36px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.02);
  color: #bfc5ce;
  font: 700 8px var(--mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  cursor: pointer;
}

.dialog-nav button:first-child {
  justify-self: start;
}

.dialog-nav button:last-child {
  justify-self: end;
}

.dialog-nav button:hover,
.dialog-nav button:focus-visible,
.dialog-nav button[aria-pressed="true"] {
  border-color: var(--line-strong);
  background: rgba(255, 255, 255, 0.06);
  color: #fff;
}

.dialog-nav button:disabled {
  opacity: 0.32;
  cursor: default;
}

.dialog-count {
  min-width: 68px;
  color: #858c96;
  font: 700 8px var(--mono);
  letter-spacing: 0.12em;
  text-align: center;
}

@media (max-width: 980px) {
  .hero-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .hero-stat:nth-child(2) {
    border-right: 0;
  }

  .hero-stat:nth-child(-n + 2) {
    border-bottom: 1px solid var(--line);
  }

  .chapter {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 72px 0;
  }

  .chapter-intro {
    position: static;
    max-width: 760px;
  }

  .guide-library-head {
    grid-template-columns: 1fr;
    gap: 22px;
  }

  .guide-library-head > p {
    max-width: 760px;
  }

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

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

  .guide-key:nth-child(2) {
    border-right: 0;
  }

  .guide-key:nth-child(-n + 2) {
    border-bottom: 1px solid var(--line);
  }

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

  .mobile-gallery .tour-shot {
    width: min(100%, 520px);
    margin: 0 auto;
  }
}

@media (max-width: 720px) {
  .site-header-inner,
  .hero-inner,
  .context-strip-inner,
  .guide-library-inner,
  .guide-main,
  .site-footer-inner {
    width: min(100% - 24px, var(--max));
  }

  .site-header-inner {
    min-height: 64px;
  }

  .brand-product,
  .brand-divider,
  .header-link:not(.primary) {
    display: none;
  }

  .brand img {
    width: 40px;
  }

  .brand-name {
    font-size: 12px;
  }

  .header-link.primary {
    min-height: 36px;
    padding: 0 11px;
    font-size: 8px;
  }

  .hero-inner {
    padding: 66px 0 54px;
  }

  .hero h1 {
    font-size: clamp(43px, 15vw, 66px);
  }

  .hero-copy {
    font-size: 16px;
  }

  .hero-actions {
    display: grid;
    grid-template-columns: 1fr;
  }

  .button {
    width: 100%;
  }

  .hero-stats {
    grid-template-columns: 1fr 1fr;
    margin-top: 42px;
  }

  .hero-stat {
    min-height: 86px;
    padding: 15px;
  }

  .hero-stat strong {
    font-size: 17px;
  }

  .context-strip-inner {
    grid-template-columns: 1fr;
  }

  .context-card,
  .context-card:first-child {
    min-height: 0;
    padding: 20px 8px;
    border-right: 0;
    border-left: 0;
    border-bottom: 1px solid var(--line);
  }

  .context-card:last-child {
    border-bottom: 0;
  }

  .guide-library-inner {
    padding: 62px 0 54px;
  }

  .guide-library-head {
    margin-bottom: 26px;
  }

  .guide-library-head h2 {
    font-size: 42px;
  }

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

  .guide-card-visual {
    aspect-ratio: 16 / 8.3;
  }

  .guide-card p {
    min-height: 0;
  }

  .guide-reading-key {
    grid-template-columns: 1fr;
  }

  .guide-key,
  .guide-key:nth-child(2) {
    border-right: 0;
  }

  .guide-key,
  .guide-key:nth-child(-n + 2) {
    border-bottom: 1px solid var(--line);
  }

  .guide-key:last-child {
    border-bottom: 0;
  }

  .guide-utility-links {
    align-items: flex-start;
  }

  .guide-utility-links span {
    flex: 0 0 100%;
  }

  .chapter {
    padding: 58px 0;
  }

  .chapter h2 {
    font-size: 36px;
  }

  .detail-grid,
  .callouts {
    grid-template-columns: 1fr;
  }

  .detail-card {
    min-height: 0;
  }

  .detail-card .num {
    margin-bottom: 18px;
  }

  .signal-state-table,
  .field-table {
    display: block;
    overflow-x: auto;
    white-space: normal;
  }

  .shot-frame {
    border-radius: 10px;
  }

  .desktop-shot .shot-frame {
    overflow-x: auto;
  }

  .desktop-shot .shot-frame img {
    width: 960px;
    max-width: none;
  }

  .pin {
    display: none;
  }

  .shot-open {
    top: 8px;
    right: 8px;
  }

  .shot-caption {
    display: block;
  }

  .shot-caption .screen-note {
    display: block;
    margin-top: 8px;
  }

  .site-footer-inner {
    min-height: 140px;
    flex-direction: column;
    align-items: flex-start;
    justify-content: center;
  }

  .guide-switcher-label {
    position: sticky;
    left: -12px;
    z-index: 1;
    align-self: stretch;
    display: inline-flex;
    align-items: center;
    margin-right: 2px;
    padding: 0 10px 0 12px;
    background: linear-gradient(90deg, #070809 82%, rgba(7, 8, 9, 0));
  }

  .guide-switcher a,
  .chapter-nav a {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .screen-dialog {
    width: 100vw;
    max-width: none;
    max-height: 100dvh;
    height: 100dvh;
    margin: 0;
    border: 0;
    border-radius: 0;
  }

  .dialog-head {
    min-height: calc(54px + env(safe-area-inset-top));
    padding-top: env(safe-area-inset-top);
  }

  .dialog-close {
    width: 44px;
    height: 44px;
  }

  .dialog-nav button {
    min-height: 44px;
  }

  .dialog-nav {
    grid-template-columns: 1fr auto 1fr;
    gap: 6px;
    padding-bottom: calc(8px + env(safe-area-inset-bottom));
  }

  .dialog-nav .dialog-count {
    grid-column: 2;
    grid-row: 1;
  }

  .dialog-nav [data-screen-zoom] {
    grid-column: 2;
    grid-row: 2;
  }

  .dialog-nav [data-screen-prev] {
    grid-column: 1;
    grid-row: 1 / span 2;
  }

  .dialog-nav [data-screen-next] {
    grid-column: 3;
    grid-row: 1 / span 2;
  }

  .dialog-body.is-zoomed img {
    min-width: max(960px, 240vw);
  }

  .desktop-shot .shot-frame {
    overflow: hidden;
  }

  .desktop-shot .shot-frame img {
    width: 100%;
    max-width: 100%;
  }

  .shot-open {
    min-height: 44px;
  }

  .screen-device-label {
    position: absolute;
    z-index: 4;
    top: 8px;
    left: 8px;
    min-height: 28px;
    display: inline-flex;
    align-items: center;
    padding: 0 8px;
    border: 1px solid rgba(108, 184, 255, 0.3);
    border-radius: 7px;
    background: rgba(5, 6, 7, 0.86);
    color: #bddcff;
    font: 700 7px var(--mono);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    backdrop-filter: blur(12px);
  }
}

@media (max-width: 390px) {
  .workflow-step {
    grid-template-columns: 44px minmax(0, 1fr);
  }

  .workflow-copy {
    padding: 16px;
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}