.guide-hero {
  position: relative;
  overflow: hidden;
  padding: 96px 0 82px;
}

.guide-glow {
  position: absolute;
  z-index: -1;
  inset: -14rem -8rem auto 46%;
  height: 42rem;
  background:
    radial-gradient(circle at 52% 48%, rgba(56, 214, 245, 0.22), transparent 21%),
    radial-gradient(circle at 58% 42%, rgba(8, 127, 255, 0.17), transparent 38%);
  filter: blur(8px);
  pointer-events: none;
}

.guide-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 0.56fr);
  align-items: center;
  gap: 80px;
}

.guide-hero h1 {
  max-width: 760px;
  font-size: clamp(3.2rem, 6vw, 5.3rem);
}

.guide-intro {
  max-width: 720px;
  margin: 27px 0 0;
  color: #4f5764;
  font-size: 19px;
  line-height: 1.65;
}

.version-card {
  padding: 30px;
  border: 1px solid rgba(8, 127, 255, 0.16);
  border-radius: 22px;
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  align-items: center;
  gap: 20px;
  background: rgba(255, 255, 255, 0.76);
  box-shadow: 0 24px 70px rgba(31, 61, 89, 0.11);
}

.version-card img {
  filter: drop-shadow(0 12px 18px rgba(8, 100, 210, 0.2));
}

.version-card strong {
  font-size: 15px;
}

.version-card div p {
  margin: 5px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.version-note {
  grid-column: 1 / -1;
  margin: 0;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  color: #4f5764;
  font-size: 13px;
}

.guide-overview {
  padding: 30px 0;
  border-block: 1px solid rgba(23, 27, 36, 0.08);
  background: rgba(255, 255, 255, 0.52);
}

.overview-steps {
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  list-style: none;
}

.overview-steps li {
  min-width: 0;
  padding: 6px 30px;
  display: grid;
  grid-template-columns: auto 1fr;
  column-gap: 13px;
}

.overview-steps li + li {
  border-left: 1px solid var(--line);
}

.overview-steps span {
  grid-row: 1 / 3;
  color: var(--blue-deep);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 12px;
  font-weight: 750;
}

.overview-steps strong {
  font-size: 16px;
}

.overview-steps p {
  margin: 3px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.guide-layout {
  padding-block: 88px 112px;
  display: grid;
  grid-template-columns: 248px minmax(0, 790px);
  justify-content: space-between;
  align-items: start;
  gap: 72px;
}

.guide-nav-card {
  position: sticky;
  top: 104px;
  max-height: calc(100vh - 128px);
  padding: 24px;
  overflow-y: auto;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.64);
}

.guide-nav-card p {
  margin: 0 0 12px;
  color: var(--blue-deep);
  font-size: 11px;
  font-weight: 760;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

.guide-nav-card ol {
  margin: 0;
  padding: 0;
  display: grid;
  list-style: none;
}

.guide-nav-card a {
  min-height: 36px;
  padding-block: 7px;
  display: flex;
  align-items: center;
  color: #545c68;
  font-size: 13px;
  line-height: 1.3;
}

.guide-nav-card a:hover {
  color: var(--blue-deep);
}

.guide-copy {
  min-width: 0;
}

.guide-section {
  padding-bottom: 82px;
}

.guide-section + .guide-section {
  padding-top: 82px;
  border-top: 1px solid var(--line-strong);
}

.section-number {
  margin: 0 0 12px;
  color: var(--blue-deep);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 12px;
  font-weight: 750;
}

.guide-copy h2,
.guide-contact h2 {
  margin: 0;
  font-size: clamp(2.2rem, 4.2vw, 3.6rem);
  font-weight: 700;
  letter-spacing: -0.05em;
  line-height: 1.05;
}

.guide-copy h3 {
  margin: 34px 0 0;
  font-size: 21px;
  font-weight: 680;
  letter-spacing: -0.025em;
}

.guide-copy p,
.guide-copy li,
.guide-copy dd {
  color: #535b67;
}

.guide-copy .section-lead {
  margin-top: 22px;
  color: #343b46;
  font-size: 19px;
  line-height: 1.65;
}

.guide-copy > .guide-section > p:not(.section-number, .section-lead, .fine-print),
.guide-copy h2 + p,
.guide-copy h3 + p {
  margin-top: 18px;
}

.guide-copy ul,
.guide-copy ol:not(.instruction-list) {
  margin: 18px 0 0;
  padding-left: 24px;
  display: grid;
  gap: 10px;
}

.guide-copy ul {
  list-style: disc;
}

.guide-copy ol:not(.instruction-list) {
  list-style: decimal;
}

.guide-copy li {
  padding-left: 4px;
}

.guide-copy li::marker {
  color: var(--blue);
  font-weight: 700;
}

.guide-copy a:not(.button) {
  color: var(--blue-deep);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.guide-copy code,
.guide-copy kbd {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

.guide-copy code {
  padding: 2px 5px;
  border: 1px solid rgba(23, 27, 36, 0.1);
  border-radius: 5px;
  background: rgba(255, 255, 255, 0.72);
  color: #303946;
  font-size: 0.88em;
  overflow-wrap: anywhere;
}

kbd {
  min-width: 27px;
  padding: 3px 7px;
  border: 1px solid rgba(23, 27, 36, 0.2);
  border-bottom-width: 2px;
  border-radius: 6px;
  display: inline-block;
  background: #fffefa;
  color: #303946;
  font-size: 0.82em;
  font-weight: 700;
  line-height: 1.25;
  text-align: center;
}

.callout {
  margin-top: 26px;
  padding: 21px 23px;
  border: 1px solid rgba(8, 127, 255, 0.16);
  border-radius: 15px;
  background: rgba(224, 244, 255, 0.52);
}

.callout-safe {
  border-color: rgba(15, 114, 74, 0.16);
  background: rgba(226, 246, 237, 0.66);
}

.callout strong {
  color: #26303d;
}

.callout p {
  margin: 6px 0 0;
  font-size: 14px;
}

.fine-print {
  margin: 19px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.format-table,
.example-table {
  max-width: 100%;
  margin-top: 18px;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.66);
}

.guide-copy table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  text-align: left;
}

.guide-copy th,
.guide-copy td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

.guide-copy thead th {
  background: rgba(226, 231, 239, 0.52);
  color: #39414d;
  font-size: 11px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.guide-copy tbody th {
  color: #303844;
  white-space: nowrap;
}

.guide-copy tbody tr:last-child > * {
  border-bottom: 0;
}

.instruction-list {
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  list-style: none;
  counter-reset: instruction;
}

.instruction-list li {
  padding: 0 0 28px 52px;
  position: relative;
  border-left: 1px solid rgba(8, 127, 255, 0.22);
  counter-increment: instruction;
}

.instruction-list li:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.instruction-list li::before {
  content: counter(instruction);
  position: absolute;
  top: -2px;
  left: -17px;
  width: 34px;
  height: 34px;
  border: 1px solid rgba(8, 127, 255, 0.2);
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--surface-solid);
  color: var(--blue-deep);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 12px;
  font-weight: 760;
}

.instruction-list p {
  margin: 6px 0 0;
}

.choice-grid,
.warning-grid {
  margin-top: 24px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.choice-grid section,
.warning-grid div,
.photo-parts div {
  padding: 23px;
  border: 1px solid var(--line);
  border-radius: 15px;
  background: rgba(255, 255, 255, 0.62);
}

.choice-grid h3 {
  margin-top: 8px;
}

.choice-grid p,
.warning-grid p,
.photo-parts p {
  margin: 8px 0 0;
  font-size: 14px;
}

.choice-label {
  color: var(--blue-deep);
  font-size: 10px;
  font-weight: 760;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.example-stack {
  margin-top: 24px;
  display: grid;
  gap: 10px;
}

.example-stack div {
  padding: 18px 20px;
  border: 1px solid rgba(8, 127, 255, 0.14);
  border-radius: 13px;
  background: rgba(255, 255, 255, 0.62);
}

.example-stack span,
.example-stack code {
  display: block;
}

.example-stack span {
  color: var(--muted);
  font-size: 10px;
  font-weight: 760;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.example-stack code {
  margin-top: 7px;
  padding: 0;
  border: 0;
  background: transparent;
  font-size: 13px;
}

.photo-parts {
  margin-top: 24px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.definition-list,
.reason-list {
  margin: 18px 0 0;
  border-top: 1px solid var(--line-strong);
}

.definition-list div,
.reason-list div {
  padding: 15px 0;
  border-bottom: 1px solid var(--line);
  display: grid;
  grid-template-columns: minmax(130px, 0.38fr) minmax(0, 1fr);
  gap: 24px;
}

.definition-list dt,
.reason-list dt {
  color: #303844;
  font-weight: 680;
}

.definition-list dd,
.reason-list dd {
  margin: 0;
}

.check-list {
  list-style: none !important;
  padding-left: 0 !important;
}

.check-list li {
  padding-left: 29px;
  position: relative;
}

.check-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--green);
  font-weight: 800;
}

.warning-grid div {
  border-color: rgba(192, 109, 10, 0.18);
  background: rgba(255, 244, 224, 0.66);
}

.privacy-list {
  padding: 0 !important;
  list-style: none !important;
}

.privacy-list li {
  padding: 17px 0 17px 32px;
  position: relative;
  border-bottom: 1px solid var(--line);
}

.privacy-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--green);
  font-weight: 800;
}

.privacy-list strong,
.privacy-list span {
  display: block;
}

.privacy-list span {
  margin-top: 3px;
}

.shortcut-grid {
  margin-top: 24px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.shortcut-grid div {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 13px;
  display: grid;
  grid-template-columns: 70px 1fr;
  align-items: center;
  gap: 14px;
  background: rgba(255, 255, 255, 0.62);
}

.shortcut-grid kbd {
  justify-self: start;
}

.shortcut-grid span {
  color: var(--muted);
  font-size: 13px;
}

.shortcut-grid strong {
  color: #303844;
}

.troubleshooting-list {
  margin-top: 24px;
  border-top: 1px solid var(--line-strong);
}

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

.troubleshooting-list summary {
  padding: 20px 44px 20px 0;
  position: relative;
  cursor: pointer;
  color: #303844;
  font-size: 16px;
  font-weight: 650;
  list-style: none;
}

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

.troubleshooting-list summary::after {
  content: "+";
  position: absolute;
  right: 5px;
  color: var(--blue-deep);
  font-size: 23px;
  font-weight: 400;
  transition: transform 160ms ease;
}

.troubleshooting-list details[open] summary::after {
  transform: rotate(45deg);
}

.troubleshooting-list p {
  margin: -2px 48px 22px 0;
  font-size: 14px;
}

.guide-contact {
  padding: 42px;
  border: 1px solid rgba(8, 127, 255, 0.16);
  border-radius: 22px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 38px;
  background:
    radial-gradient(circle at 95% 10%, rgba(56, 214, 245, 0.18), transparent 15rem),
    rgba(255, 255, 255, 0.72);
}

.guide-contact h2 {
  font-size: clamp(2rem, 3.6vw, 3rem);
}

.guide-contact p:not(.eyebrow) {
  margin: 15px 0 0;
  color: var(--muted);
}

@media (max-width: 980px) {
  .guide-hero-grid {
    grid-template-columns: 1fr;
    gap: 46px;
  }

  .version-card {
    width: min(560px, 100%);
  }

  .guide-layout {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .guide-nav-card {
    position: static;
    max-height: none;
    overflow-y: visible;
  }

  .guide-nav-card ol {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0 18px;
  }
}

@media (max-width: 840px) {
  .guide-hero {
    padding: 72px 0 68px;
  }

  .overview-steps {
    grid-template-columns: 1fr;
  }

  .overview-steps li {
    padding: 15px 8px;
  }

  .overview-steps li + li {
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .guide-layout {
    padding-block: 68px 88px;
  }
}

@media (max-width: 620px) {
  .guide-hero h1 {
    font-size: clamp(2.8rem, 14vw, 4rem);
  }

  .guide-intro {
    font-size: 17px;
  }

  .version-card {
    padding: 24px 20px;
    grid-template-columns: 58px minmax(0, 1fr);
  }

  .version-card img {
    width: 58px;
    height: 58px;
  }

  .guide-nav-card ol,
  .choice-grid,
  .warning-grid,
  .photo-parts,
  .shortcut-grid {
    grid-template-columns: 1fr;
  }

  .guide-section {
    padding-bottom: 62px;
  }

  .guide-section + .guide-section {
    padding-top: 62px;
  }

  .definition-list div,
  .reason-list div {
    grid-template-columns: 1fr;
    gap: 5px;
  }

  .instruction-list li {
    padding-left: 44px;
  }

  .guide-contact {
    padding: 30px 22px;
    grid-template-columns: 1fr;
  }

  .guide-contact .button {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .troubleshooting-list summary::after {
    transition: none;
  }
}