.manual-shell {
  width: min(1080px, calc(100% - 32px));
  margin: 0 auto;
  padding: 22px 0 52px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.manual-topbar,
.manual-brand,
.manual-nav,
.manual-footer {
  display: flex;
  align-items: center;
}

.manual-topbar {
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.manual-brand {
  color: inherit;
  text-decoration: none;
  gap: 13px;
  min-width: 0;
}

.manual-brand strong {
  display: block;
  font-size: 22px;
  line-height: 1.15;
}

.manual-hero,
.manual-section {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: color-mix(in srgb, var(--panel) 92%, transparent);
  box-shadow: var(--shadow);
}

.manual-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(280px, .95fr);
  gap: 22px;
  padding: 28px;
  overflow: hidden;
}

.manual-hero h1 {
  max-width: 720px;
  margin: 8px 0 12px;
  font-size: clamp(30px, 5.4vw, 54px);
  line-height: 1.04;
}

.manual-hero p {
  max-width: 680px;
  margin: 0;
  color: var(--muted);
  font-size: 16px;
}

.model-switch {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  align-self: stretch;
}

.model-switch article,
.manual-card,
.flow-step,
.mapping-panel,
.status-table {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
}

.model-switch article {
  min-height: 236px;
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  justify-content: center;
}

.model-switch strong,
.manual-card h3 {
  font-size: 16px;
}

.model-switch span:not(.model-icon),
.model-switch small {
  color: var(--muted);
}

.model-switch small {
  line-height: 1.5;
}

.model-icon {
  position: relative;
  display: block;
  width: 74px;
  height: 102px;
  border-radius: 22px;
  background: linear-gradient(180deg, #202832, #0d1219);
  box-shadow: inset 0 0 0 1px rgba(255,255,255,.12), 0 18px 28px -20px rgba(0,0,0,.5);
}

.model-icon::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 18px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  transform: translateX(-50%);
  background: var(--accent);
  box-shadow: 0 0 18px var(--accent);
}

.model-icon.display::before {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  top: 14px;
  height: 38px;
  border-radius: 6px;
  background:
    linear-gradient(90deg, rgba(255,255,255,.18), transparent),
    #101927;
  border: 1px solid rgba(255,255,255,.22);
}

.manual-nav {
  position: sticky;
  top: 0;
  z-index: 2;
  gap: 8px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: color-mix(in srgb, var(--panel) 86%, transparent);
  backdrop-filter: blur(18px);
  overflow-x: auto;
}

.manual-nav a,
.manual-footer a {
  color: var(--accent-strong);
  text-decoration: none;
  font-weight: 800;
}

.manual-nav a {
  flex: 0 0 auto;
  padding: 8px 11px;
  border-radius: 8px;
  color: var(--muted);
}

.manual-nav a:hover {
  color: var(--ink);
  background: var(--panel-2);
}

.manual-section {
  padding: 24px;
}

.section-heading {
  margin-bottom: 18px;
}

.section-heading h2 {
  font-size: clamp(22px, 3.4vw, 32px);
  line-height: 1.14;
}

.section-heading p:not(.eyebrow),
.manual-card p,
.soft-note {
  color: var(--muted);
}

.flow-diagram {
  display: grid;
  grid-template-columns: 1fr 34px 1fr 34px 1fr 34px 1fr;
  align-items: center;
  gap: 0;
}

.flow-step {
  min-height: 138px;
  padding: 16px;
  display: grid;
  align-content: center;
  gap: 7px;
}

.flow-step span,
.step-list span {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--secondary));
  font-size: 13px;
  font-weight: 900;
}

.flow-step small {
  color: var(--muted);
  line-height: 1.45;
}

.flow-line {
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--secondary));
}

.note-grid,
.compat-grid,
.model-detail-grid,
.faq-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 14px;
}

.manual-card {
  padding: 18px;
}

.manual-card h3,
.manual-card p {
  margin: 0;
}

.manual-card h3 {
  margin-bottom: 8px;
}

.split-section {
  display: grid;
  grid-template-columns: minmax(0, .9fr) minmax(280px, 1.1fr);
  gap: 22px;
}

.step-list {
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
  list-style: none;
}

.step-list li {
  display: grid;
  grid-template-columns: 30px 1fr;
  gap: 12px;
  align-items: start;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
}

.step-list p {
  margin: 3px 0 0;
  color: var(--muted);
}

.pairing-layout {
  display: grid;
  grid-template-columns: minmax(280px, .95fr) minmax(0, 1.05fr);
  gap: 18px;
  align-items: stretch;
}

.device-illustration {
  min-height: 280px;
  position: relative;
  border: 1px solid var(--line);
  border-radius: 8px;
  background:
    linear-gradient(180deg, color-mix(in srgb, var(--accent-soft) 70%, transparent), transparent),
    var(--panel);
  overflow: hidden;
}

.usb-port,
.dongle-shape,
.hid-device {
  position: absolute;
  display: grid;
  place-items: center;
  font-weight: 900;
}

.usb-port {
  left: 22px;
  top: 48%;
  width: 72px;
  height: 42px;
  border-radius: 8px;
  color: #fff;
  background: #273241;
}

.dongle-shape {
  left: 112px;
  top: 78px;
  width: 92px;
  height: 130px;
  border-radius: 26px;
  color: #fff;
  background: linear-gradient(180deg, #283342, #0d1219);
  box-shadow: var(--shadow);
}

.dongle-led {
  position: absolute;
  bottom: 24px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 18px var(--accent);
}

.signal-wave {
  position: absolute;
  left: 210px;
  top: 86px;
  width: 116px;
  height: 116px;
}

.signal-wave span {
  position: absolute;
  inset: calc(var(--i, 0) * 15px);
  border: 2px solid color-mix(in srgb, var(--secondary) 48%, transparent);
  border-left-color: transparent;
  border-bottom-color: transparent;
  border-radius: 50%;
  transform: rotate(45deg);
}

.signal-wave span:nth-child(1) { --i: 0; }
.signal-wave span:nth-child(2) { --i: 1; }
.signal-wave span:nth-child(3) { --i: 2; }

.hid-device {
  right: 24px;
  top: 96px;
  width: 140px;
  min-height: 96px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: var(--shadow-sm);
  text-align: center;
}

.hid-device span {
  width: 58px;
  height: 32px;
  border-radius: 18px;
  background: var(--panel-2);
  border: 1px solid var(--line-strong);
}

.soft-note {
  margin: 14px 0 0;
  padding: 12px 14px;
  border-radius: 8px;
  background: var(--accent-soft);
}

.model-detail {
  display: grid;
  gap: 10px;
}

.model-detail ul {
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
}

.model-mini {
  width: 74px;
  height: 48px;
  border-radius: 14px;
  background: linear-gradient(135deg, #202832, #0d1219);
  position: relative;
}

.model-mini::after {
  content: "";
  position: absolute;
  right: 13px;
  top: 18px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 16px var(--accent);
}

.model-mini.display::before {
  content: "";
  position: absolute;
  left: 12px;
  top: 12px;
  width: 28px;
  height: 18px;
  border-radius: 4px;
  background: #101927;
  border: 1px solid rgba(255,255,255,.22);
}

.mapping-panel {
  padding: 12px;
  display: grid;
  gap: 10px;
}

.mapping-panel div {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 14px;
  border-radius: 8px;
  background: var(--panel-2);
}

.mapping-panel span {
  color: var(--muted);
  font-weight: 800;
}

.status-table {
  overflow: hidden;
}

.status-table > div {
  display: grid;
  grid-template-columns: minmax(190px, .55fr) 1fr;
  gap: 16px;
  padding: 13px 15px;
  border-top: 1px solid var(--line);
}

.status-table > div:first-child {
  border-top: 0;
}

.status-table span[role="cell"] {
  color: var(--muted);
}

.led-dot {
  display: inline-block;
  width: 12px;
  height: 12px;
  margin-right: 9px;
  border-radius: 50%;
  vertical-align: -1px;
  background: var(--faint);
}

.led-dot.white { background: #fff; box-shadow: 0 0 0 1px var(--line), 0 0 14px rgba(255,255,255,.8); }
.led-dot.blue { background: #2d8cff; box-shadow: 0 0 14px #2d8cff; }
.led-dot.green { background: #20d087; box-shadow: 0 0 14px #20d087; }
.led-dot.purple { background: #a66cff; box-shadow: 0 0 14px #a66cff; }
.led-dot.red { background: #ff554a; box-shadow: 0 0 14px #ff554a; }
.led-dot.fast { outline: 2px solid color-mix(in srgb, #2d8cff 25%, transparent); }

.manual-footer {
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  color: var(--muted);
  padding: 8px 0;
}

@media (max-width: 860px) {
  .manual-hero,
  .split-section,
  .pairing-layout {
    grid-template-columns: 1fr;
  }

  .flow-diagram {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .flow-line {
    width: 2px;
    height: 18px;
    margin: -10px auto;
  }

  .note-grid,
  .compat-grid,
  .model-detail-grid,
  .faq-grid,
  .model-switch {
    grid-template-columns: 1fr;
  }

  .device-illustration {
    min-height: 260px;
  }
}

@media (max-width: 560px) {
  .manual-shell {
    width: min(100% - 20px, 1080px);
    padding-top: 14px;
  }

  .manual-hero,
  .manual-section {
    padding: 18px;
  }

  .manual-topbar .button {
    width: 100%;
  }

  .status-table > div {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .hid-device {
    right: 14px;
    width: 118px;
  }

  .dongle-shape {
    left: 92px;
  }

  .usb-port {
    left: 14px;
  }

  .signal-wave {
    left: 180px;
    width: 82px;
  }
}