.hero-preview {
  position: relative;
  display: flex;
  min-height: calc(100svh - var(--header-height) - 88px);
  align-items: center;
  overflow-x: clip;
}

.hero-layout {
  display: grid;
  width: 100%;
  grid-template-columns: minmax(0, 1.02fr) minmax(480px, 0.98fr);
  gap: 64px;
  align-items: center;
  padding-top: 36px;
  padding-bottom: 36px;
}

.hero-copy h1 {
  margin-top: 22px;
  margin-bottom: 26px;
}

.hero-copy .cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 26px;
}

.hero-copy .lead {
  margin-bottom: 24px;
  font-size: 15px;
}

.hero-copy .lead strong {
  color: var(--color-ink);
  font-weight: 600;
}

.hero-visual {
  display: flex;
  min-width: 0;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.tunnel-card {
  width: 100%;
  max-width: 552px;
  overflow: hidden;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-medium);
  background: var(--color-canvas);
}

.tunnel-card__head {
  display: flex;
  min-height: 42px;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 0 18px;
  border-bottom: 1px solid var(--color-line);
  background: var(--color-panel);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.07em;
}

.tunnel-card__title {
  display: inline-flex;
  align-items: center;
  gap: 9px;
}

.tunnel-card__title::before {
  width: 6px;
  height: 6px;
  flex-shrink: 0;
  content: "";
  background: var(--color-ink);
}

.tunnel-card__figure {
  width: 100%;
  height: auto;
}

.svg-line {
  fill: none;
  stroke: var(--color-ink-muted);
}

.svg-line-soft {
  fill: none;
  stroke: var(--color-line);
}

.svg-ring-strong {
  fill: none;
  stroke: var(--color-ink);
}

.svg-core,
.svg-endpoint {
  fill: var(--color-signal);
}

.svg-paper {
  fill: var(--color-canvas);
}

.svg-ink {
  fill: var(--color-ink);
}

.svg-muted {
  fill: var(--color-ink-muted);
}

.svg-red {
  fill: var(--color-flag-red);
}

.svg-navy {
  fill: var(--color-flag-navy);
}

.svg-label {
  fill: var(--color-ink);
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.04em;
}

.svg-label-muted {
  fill: var(--color-ink-muted);
}

.svg-flag-label {
  fill: var(--color-ink);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.04em;
  text-anchor: middle;
}

.tunnel-spin {
  transform-origin: 280px 260px;
  animation: tunnel-rotate 90s linear infinite;
}

.tunnel-pulse {
  animation: endpoint-pulse 3s ease-in-out infinite;
}

.tunnel-pulse:nth-of-type(2) {
  animation-delay: 500ms;
}

.tunnel-pulse:nth-of-type(3) {
  animation-delay: 1s;
}

.tunnel-pulse:nth-of-type(4) {
  animation-delay: 1.5s;
}

.tunnel-pulse:nth-of-type(5) {
  animation-delay: 2s;
}

@keyframes tunnel-rotate {
  to {
    transform: rotate(360deg);
  }
}

@keyframes endpoint-pulse {
  0%,
  100% {
    opacity: 0.32;
  }

  50% {
    opacity: 1;
  }
}

.platform-strip {
  display: flex;
  width: 100%;
  max-width: 552px;
  align-items: center;
  justify-content: center;
  gap: 28px;
}

.platform-mark {
  display: inline-flex;
  min-width: 0;
  align-items: center;
  gap: 7px;
  color: var(--color-ink-muted);
}

.platform-mark svg {
  width: 17px;
  height: 17px;
  flex-shrink: 0;
}

.platform-mark span {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.03em;
}

.fact-band {
  border-top: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
  background: var(--color-panel);
}

.fact-band__inner {
  display: flex;
  padding-top: 22px;
  padding-bottom: 22px;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.fact-band__item {
  display: grid;
  gap: 4px;
}

.fact-band__key {
  color: var(--color-ink-muted);
  font-size: 11.5px;
  letter-spacing: 0.06em;
}

.fact-band__value {
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 600;
}

.fact-band__divider {
  width: 1px;
  height: 34px;
  flex-shrink: 0;
  background: var(--color-line);
}

.tabs {
  min-width: 0;
}

.tab-list,
[role="tablist"] {
  display: flex;
  max-width: 100%;
  gap: 6px;
  padding: 5px;
  overflow-x: auto;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-pill);
  background: var(--color-panel);
  scrollbar-width: thin;
}

.tab-button,
[role="tab"] {
  min-height: 42px;
  flex: 0 0 auto;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  padding: 9px 20px;
  color: var(--color-ink-muted);
  background: transparent;
  font-size: 14px;
  font-weight: 600;
}

.tab-button[aria-selected="true"],
[role="tab"][aria-selected="true"] {
  color: var(--color-canvas);
  border-color: var(--color-ink);
  background: var(--color-ink);
}

[role="tabpanel"][hidden] {
  display: none;
}

.tab-panel {
  padding-top: 30px;
}

.toc-tabs {
  position: sticky;
  z-index: 30;
  top: 0;
  display: flex;
  max-width: 100%;
  gap: 6px;
  padding: 9px;
  overflow-x: auto;
  overscroll-behavior-inline: contain;
  border-bottom: 1px solid var(--color-line);
  background: var(--color-canvas);
  scrollbar-width: thin;
}

.toc-tabs a {
  display: inline-flex;
  min-height: 40px;
  flex: 0 0 auto;
  align-items: center;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-pill);
  padding: 8px 15px;
  color: var(--color-ink-muted);
  font-size: 13px;
  white-space: nowrap;
}

.toc-tabs a.is-current,
.toc-tabs a[aria-current="location"] {
  color: var(--color-canvas);
  border-color: var(--color-signal);
  background: var(--color-signal);
}

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

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

.faq-item summary {
  position: relative;
  min-height: 72px;
  padding: 22px 48px 22px 0;
  font-size: 17px;
  font-weight: 600;
  list-style: none;
}

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

.faq-item summary::after {
  position: absolute;
  top: 50%;
  right: 4px;
  width: 18px;
  height: 18px;
  content: "+";
  color: var(--color-ink-muted);
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 18px;
  text-align: center;
  transform: translateY(-50%);
}

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

.faq-item__answer {
  max-width: 72ch;
  padding: 0 48px 24px 0;
  color: var(--color-ink-muted);
}

.plan-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.plan-card {
  position: relative;
  display: grid;
  min-width: 0;
  min-height: 430px;
  align-content: start;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-medium);
  padding: 28px;
  background: var(--color-canvas);
}

.plan-card.is-current,
.plan-card--featured {
  border-color: var(--color-signal);
}

.plan-card__badge {
  position: absolute;
  top: 18px;
  right: 18px;
}

.plan-card__period {
  color: var(--color-ink-muted);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
}

.plan-card h3 {
  margin-top: 18px;
}

.plan-card__price {
  display: flex;
  margin-top: 28px;
  align-items: baseline;
  gap: 5px;
}

.plan-card__price strong {
  font-family: var(--font-display);
  font-size: 48px;
  font-weight: 400;
  line-height: 1;
}

.plan-card__price span {
  color: var(--color-ink-muted);
}

.plan-card__features {
  display: grid;
  gap: 11px;
  margin: 28px 0;
  list-style: none;
  color: var(--color-ink-muted);
  font-size: 14px;
}

.plan-card__features li {
  display: flex;
  gap: 9px;
}

.plan-card__features li::before {
  flex-shrink: 0;
  content: "—";
  color: var(--color-signal);
}

.plan-card .btn,
.plan-card .btn-main,
.plan-card .btn-sub {
  align-self: end;
  margin-top: auto;
}

.table-scroll {
  width: 100%;
  max-width: 100%;
  overflow-x: auto;
  overscroll-behavior-inline: contain;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-small);
  -webkit-overflow-scrolling: touch;
}

.data-table,
.server-table,
.comparison-table {
  width: 100%;
  min-width: 720px;
  background: var(--color-canvas);
  text-align: left;
}

.data-table th,
.data-table td,
.server-table th,
.server-table td,
.comparison-table th,
.comparison-table td {
  padding: 15px 18px;
  border-bottom: 1px solid var(--color-line);
  vertical-align: top;
}

.data-table th,
.server-table th,
.comparison-table th {
  color: var(--color-ink);
  background: var(--color-panel-strong);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.data-table td:first-child,
.server-table td:first-child,
.comparison-table td:first-child {
  color: var(--color-ink);
  font-weight: 600;
}

.data-table tbody tr:nth-child(even),
.server-table tbody tr:nth-child(even),
.comparison-table tbody tr:nth-child(even) {
  background: var(--color-panel);
}

.data-table tbody tr:hover,
.server-table tbody tr:hover,
.comparison-table tbody tr:hover {
  background: var(--color-panel-strong);
}

.data-table tr:last-child td,
.server-table tr:last-child td,
.comparison-table tr:last-child td {
  border-bottom: 0;
}

.server-group-row th {
  color: var(--color-canvas);
  background: var(--color-ink);
}

.platform-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 14px;
}

.platform-card {
  display: grid;
  min-width: 0;
  min-height: 230px;
  align-content: start;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-small);
  padding: 22px;
  background: var(--color-canvas);
}

.platform-card__icon {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-small);
  color: var(--color-ink);
}

.platform-card__icon svg {
  width: 22px;
  height: 22px;
}

.platform-card h3 {
  margin-top: 20px;
  font-family: var(--font-body);
  font-size: 18px;
  font-weight: 650;
}

.platform-card p {
  margin: 8px 0 20px;
  color: var(--color-ink-muted);
  font-size: 13px;
}

.platform-card .btn-sub {
  align-self: end;
  margin-top: auto;
  padding-inline: 16px;
}

.article-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-top: 1px solid var(--color-line);
}

.article-card {
  display: grid;
  min-width: 0;
  min-height: 300px;
  align-content: start;
  padding: 28px;
  border-right: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
  background: var(--color-canvas);
  transition:
    border-color var(--motion-fast) ease,
    transform var(--motion-fast) ease;
}

.article-card:nth-child(3n) {
  border-right: 0;
}

.article-card:hover {
  border-top-color: var(--color-signal);
  transform: translateY(-2px);
}

.article-card__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  align-items: center;
  color: var(--color-ink-muted);
  font-family: var(--font-mono);
  font-size: 11px;
}

.article-card h3 {
  margin-top: 24px;
  font-size: 27px;
}

.article-card p {
  margin-top: 16px;
  color: var(--color-ink-muted);
  font-size: 14px;
}

.article-card .text-link {
  align-self: end;
  width: max-content;
  margin-top: 24px;
}

.callout {
  position: relative;
  padding: 22px 24px 22px 52px;
  border-left: 3px solid var(--color-signal);
  border-radius: 0 var(--radius-small) var(--radius-small) 0;
  background: var(--color-panel);
}

.callout::before {
  position: absolute;
  top: 23px;
  left: 20px;
  width: 20px;
  height: 20px;
  content: "i";
  border: 1px solid var(--color-signal);
  border-radius: var(--radius-pill);
  color: var(--color-signal);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  line-height: 18px;
  text-align: center;
}

.callout--success {
  border-color: var(--color-positive);
}

.callout--success::before {
  content: "✓";
  color: var(--color-positive);
  border-color: var(--color-positive);
}

.callout--warning {
  border-color: var(--color-caution);
}

.callout--warning::before {
  content: "!";
  color: var(--color-caution);
  border-color: var(--color-caution);
}

.promo-block {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 32px;
  align-items: center;
  overflow-x: clip;
  border: 1px solid var(--color-ink);
  border-radius: var(--radius-medium);
  padding: clamp(28px, 5vw, 54px);
  color: var(--color-canvas);
  background: var(--color-ink);
}

.promo-block::after {
  position: absolute;
  right: 18%;
  width: 110px;
  height: 110px;
  content: "";
  border: 1px dashed var(--color-ink-muted);
  border-radius: var(--radius-pill);
  pointer-events: none;
}

.promo-block__copy {
  position: relative;
  z-index: 1;
}

.promo-block__brand {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
}

.promo-block h2 {
  margin-top: 12px;
  font-size: clamp(30px, 4vw, 48px);
}

.promo-block p {
  max-width: 56ch;
  margin-top: 12px;
  color: var(--color-line);
}

.promo-block .btn-main {
  position: relative;
  z-index: 1;
}

.float-cta {
  position: fixed;
  z-index: 80;
  right: 28px;
  bottom: 28px;
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  gap: 9px;
  border-radius: var(--radius-pill);
  padding: 12px 24px;
  color: var(--color-canvas);
  background: var(--color-signal);
  font-size: 14px;
  font-weight: 650;
  letter-spacing: 0.02em;
  transition: background-color var(--motion-fast) ease;
}

.float-cta:hover {
  background: var(--color-signal-deep);
}

.float-cta svg {
  width: 17px;
  height: 17px;
  flex-shrink: 0;
}

.feature-blueprint {
  border-top: 1px solid var(--color-line);
}

.feature-note {
  display: grid;
  grid-template-columns: 230px minmax(0, 1fr);
  min-height: 230px;
  border-bottom: 1px solid var(--color-line);
}

.feature-note__index {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 36px 36px 36px 0;
  font-family: var(--font-mono);
  font-size: 13px;
}

.feature-note__index svg {
  width: 72px;
  height: 72px;
}

.feature-note__copy {
  max-width: 820px;
  padding: 36px 0 36px 48px;
  border-left: 1px solid var(--color-line);
}

.feature-note__copy h3 {
  font-size: 30px;
}

.feature-note__copy p {
  margin-top: 14px;
  color: var(--color-ink-muted);
}

.palette-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 12px;
}

.palette-swatch {
  overflow: hidden;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-small);
}

.palette-swatch__color {
  height: 92px;
  border-bottom: 1px solid var(--color-line);
}

.palette-swatch__meta {
  padding: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
}

.swatch-canvas {
  background: var(--color-canvas);
}

.swatch-panel {
  background: var(--color-panel);
}

.swatch-panel-strong {
  background: var(--color-panel-strong);
}

.swatch-line {
  background: var(--color-line);
}

.swatch-signal {
  background: var(--color-signal);
}

.swatch-signal-deep {
  background: var(--color-signal-deep);
}

.swatch-ink {
  background: var(--color-ink);
}

.swatch-muted {
  background: var(--color-ink-muted);
}

.swatch-positive {
  background: var(--color-positive);
}

.swatch-caution {
  background: var(--color-caution);
}

.swatch-negative {
  background: var(--color-negative);
}

.preview-section__head {
  display: grid;
  max-width: 800px;
  gap: 16px;
  margin-bottom: 48px;
}

.preview-section__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--color-ink-muted);
}

.type-specimen {
  display: grid;
  gap: 36px;
  padding: 36px;
}

.type-specimen__mono {
  font-family: var(--font-mono);
}

.button-specimen {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
}

.button-specimen .is-hover {
  background: var(--color-signal-deep);
}

.button-specimen .is-disabled {
  opacity: 0.45;
}

.preview-footer {
  margin-top: var(--section-space);
}

@media (max-width: 1080px) {
  .hero-preview {
    min-height: auto;
  }

  .hero-layout {
    grid-template-columns: 1fr;
    gap: 52px;
    padding-top: 64px;
    padding-bottom: 64px;
  }

  .hero-visual {
    width: 100%;
  }

  .fact-band__inner {
    flex-wrap: wrap;
  }

  .fact-band__divider {
    display: none;
  }

  .platform-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .palette-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 820px) {
  .plan-grid,
  .article-grid {
    grid-template-columns: 1fr;
  }

  .article-card,
  .article-card:nth-child(3n) {
    border-right: 0;
  }

  .feature-note {
    grid-template-columns: 1fr;
  }

  .feature-note__index {
    padding: 28px 0 18px;
  }

  .feature-note__copy {
    padding: 0 0 30px;
    border-left: 0;
  }

  .promo-block {
    grid-template-columns: 1fr;
  }

  .promo-block::after {
    display: none;
  }
}

@media (max-width: 640px) {
  .hero-layout {
    gap: 40px;
    padding-top: 44px;
    padding-bottom: 48px;
  }

  .hero-copy h1 {
    margin-top: 17px;
    margin-bottom: 20px;
  }

  .hero-copy .cta-row {
    margin-bottom: 20px;
  }

  .hero-copy .cta-row .btn-main,
  .hero-copy .cta-row .btn-sub {
    flex: 1 1 140px;
  }

  .tunnel-card__head {
    padding-inline: 12px;
  }

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

  .platform-mark {
    justify-content: center;
  }

  .platform-card {
    min-height: 210px;
  }

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

  .plan-card {
    min-height: 0;
    padding: 24px;
  }

  .plan-card__badge {
    display: none;
  }

  .toc-tabs {
    top: 0;
  }

  .faq-item summary {
    padding-right: 34px;
  }

  .faq-item__answer {
    padding-right: 0;
  }

  .float-cta {
    right: 16px;
    bottom: 16px;
    padding: 11px 18px;
  }

  .table-scroll {
    max-width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .data-table,
  .server-table,
  .comparison-table {
    min-width: 680px;
  }

  .type-specimen {
    padding: 24px;
  }
}

@media (max-width: 390px) {
  .platform-grid,
  .palette-grid {
    grid-template-columns: 1fr;
  }

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

  .float-cta {
    max-width: calc(100vw - 32px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .tunnel-spin,
  .tunnel-pulse {
    animation: none;
  }
}