:root {
  --hero-grid-line: rgba(30, 79, 219, 0.07);
  --hero-grid-fade: rgba(255, 255, 255, 0);
  --accent-soft: rgba(30, 79, 219, 0.08);
  --success-soft: rgba(26, 154, 91, 0.08);
  --warning-soft: rgba(192, 138, 31, 0.10);
  --error-soft: rgba(214, 72, 60, 0.08);
}

.hero {
  position: relative;
  overflow-x: clip;
  padding-top: 30px;
  text-align: center;
}

.hero::before {
  position: absolute;
  inset: 0 0 18%;
  z-index: -1;
  background-image:
    linear-gradient(var(--hero-grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--hero-grid-line) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: linear-gradient(to bottom, var(--color-ink), var(--hero-grid-fade));
  content: "";
}

.hero h1 {
  margin: 18px auto 22px;
}

.hero .cta-row {
  justify-content: center;
}

.hero-description {
  max-width: 720px;
  margin: 20px auto 14px;
  color: var(--color-muted);
  font-size: 15px;
}

.hero-description strong {
  color: var(--color-ink);
}

.trust-row,
.platform-row,
.flag-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
}

.platform-row {
  gap: 30px;
  margin-top: 3px;
}

.platform-mark,
.flag-mark {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--color-muted);
  font-size: 13px;
  font-weight: 650;
}

.platform-mark svg,
.flag-mark svg {
  flex: 0 0 auto;
}

.flag-row {
  gap: 24px;
  margin-top: 15px;
}

.relay-device {
  position: relative;
  max-width: 1160px;
  margin: 22px auto 0;
}

.relay-device svg {
  width: 100%;
}

.svg-ground {
  fill: var(--color-panel-strong);
}

.svg-pipe-outer {
  fill: none;
  stroke: var(--color-ink);
  stroke-linecap: round;
  stroke-width: 22;
}

.svg-pipe-inner {
  fill: none;
  stroke: var(--color-panel);
  stroke-linecap: round;
  stroke-width: 19;
}

.svg-pipe-accent {
  fill: none;
  stroke: var(--color-accent);
  stroke-width: 19;
}

.svg-guide {
  fill: none;
  stroke: var(--color-line);
  stroke-dasharray: 4 6;
  stroke-width: 1.3;
}

.svg-tower-side,
.svg-ring {
  fill: var(--color-canvas);
  stroke: var(--color-ink);
  stroke-width: 1.2;
}

.svg-tower-top {
  fill: var(--color-panel);
  stroke: var(--color-ink);
  stroke-width: 1.2;
}

.svg-port {
  fill: none;
  stroke: var(--color-accent);
  stroke-width: 1.4;
}

.svg-pin,
.svg-drop {
  fill: none;
  stroke: var(--color-muted);
  stroke-width: 1.2;
}

.svg-drop {
  stroke-dasharray: 3 5;
}

.svg-hub {
  fill: var(--color-canvas);
  stroke: var(--color-ink);
  stroke-width: 1.5;
}

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

.svg-label {
  fill: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
}

.svg-packet {
  fill: var(--color-accent);
  opacity: 0;
  stroke: var(--color-canvas);
  stroke-width: 1.4;
}

.packet-left {
  animation: packet-left 3.8s linear infinite;
}

.packet-right {
  animation: packet-right 3.8s linear infinite 0.9s;
}

.packet-center {
  animation: packet-center 2.6s linear infinite 0.4s;
}

@keyframes packet-left {
  0% { opacity: 0; transform: translate(0, 0); }
  8%, 90% { opacity: 1; }
  100% { opacity: 0; transform: translate(272px, 55px); }
}

@keyframes packet-right {
  0% { opacity: 0; transform: translate(0, 0); }
  8%, 90% { opacity: 1; }
  100% { opacity: 0; transform: translate(-272px, 55px); }
}

@keyframes packet-center {
  0% { opacity: 0; transform: translate(0, 0); }
  10%, 88% { opacity: 1; }
  100% { opacity: 0; transform: translate(0, 86px); }
}

.tabs {
  max-width: 100%;
}

.tab-list {
  display: flex;
  max-width: 100%;
  gap: 6px;
  overflow-x: auto;
  padding: 5px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-medium);
  background: var(--color-panel);
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.tab-list [role="tab"] {
  min-height: 42px;
  flex: 0 0 auto;
  padding: 9px 18px;
  border-radius: var(--radius-small);
  background: transparent;
  color: var(--color-muted);
  cursor: pointer;
  font-weight: 700;
}

.tab-list [role="tab"][aria-selected="true"],
.tab-list [role="tab"].active {
  background: var(--color-canvas);
  color: var(--color-ink);
  box-shadow: var(--shadow-panel);
}

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

.tab-panel {
  padding-top: 24px;
}

.toc-tabs {
  position: sticky;
  top: 10px;
  z-index: 50;
  display: flex;
  max-width: 100%;
  gap: 6px;
  overflow-x: auto;
  padding: 6px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-medium);
  background: var(--color-canvas);
  box-shadow: var(--shadow-panel);
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.toc-tabs a {
  min-height: 40px;
  flex: 0 0 auto;
  padding: 8px 14px;
  border-radius: var(--radius-small);
  color: var(--color-muted);
  font-size: 14px;
  font-weight: 650;
}

.toc-tabs a:hover,
.toc-tabs a.current,
.toc-tabs a[aria-current="location"] {
  background: var(--accent-soft);
  color: var(--color-accent);
}

.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: 64px;
  padding: 20px 42px 20px 0;
  color: var(--color-ink);
  cursor: pointer;
  font-weight: 750;
  list-style: none;
}

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

.faq-item summary::after {
  position: absolute;
  top: 20px;
  right: 8px;
  color: var(--color-accent);
  content: "+";
  font-family: var(--font-mono);
  font-size: 22px;
  line-height: 1;
}

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

.faq-answer {
  max-width: 850px;
  padding: 0 42px 20px 0;
  color: var(--color-muted);
}

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

.plan-card {
  position: relative;
  min-width: 0;
  padding: 28px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-medium);
  background: var(--color-canvas);
  box-shadow: var(--shadow-panel);
}

.plan-card.featured {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 1px var(--color-accent), var(--shadow-panel);
}

.plan-badge {
  position: absolute;
  top: 14px;
  right: 14px;
}

.plan-name {
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
}

.plan-price {
  display: flex;
  align-items: baseline;
  gap: 5px;
  margin: 18px 0;
}

.plan-price strong {
  font-family: var(--font-display);
  font-size: 42px;
  line-height: 1;
}

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

.plan-features {
  display: grid;
  gap: 10px;
  margin: 22px 0 28px;
  padding: 0;
  list-style: none;
}

.plan-features li {
  position: relative;
  padding-left: 21px;
  color: var(--color-muted);
}

.plan-features li::before {
  position: absolute;
  top: 0;
  left: 0;
  color: var(--color-accent);
  content: "✓";
  font-weight: 800;
}

.table-scroll {
  width: 100%;
  max-width: 100%;
  overflow-x: auto;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-medium);
  background: var(--color-canvas);
  -webkit-overflow-scrolling: touch;
}

.table-scroll table {
  width: 100%;
  min-width: 720px;
  margin: 0;
}

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

.network-table th:first-child,
.network-table td:first-child,
.comparison-table th:first-child,
.comparison-table td:first-child {
  color: var(--color-ink);
  font-weight: 700;
}

.region-row th {
  background: var(--color-panel-strong);
  color: var(--color-ink);
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
}

.prose > .data-table {
  display: block;
  width: 100%;
  max-width: 100%;
  min-width: 0;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

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

.platform-card {
  display: flex;
  min-width: 0;
  min-height: 190px;
  align-items: flex-start;
  flex-direction: column;
  padding: 22px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-medium);
  background: var(--color-canvas);
  box-shadow: var(--shadow-panel);
}

.platform-card-icon {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  margin-bottom: 20px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-small);
  color: var(--color-accent);
}

.platform-card h3 {
  margin-bottom: 5px;
  font-size: 18px;
}

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

.platform-card .btn-secondary {
  width: 100%;
  margin-top: auto;
  padding: 10px;
  font-size: 13px;
}

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

.article-card {
  display: flex;
  min-width: 0;
  min-height: 260px;
  flex-direction: column;
  padding: 26px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-medium);
  background: var(--color-canvas);
  box-shadow: var(--shadow-panel);
  transition: transform var(--motion-fast) ease, border-color var(--motion-fast) ease;
}

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

.article-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 12px;
}

.article-card h3 {
  margin: 18px 0 12px;
  font-size: 22px;
}

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

.article-card-link {
  margin-top: auto;
  color: var(--color-accent);
  font-weight: 750;
}

.callout {
  padding: 20px 22px;
  border-left: 4px solid var(--color-accent);
  border-radius: 0 var(--radius-medium) var(--radius-medium) 0;
  background: var(--accent-soft);
  color: var(--color-ink);
}

.callout.warning {
  border-left-color: var(--color-warning);
  background: var(--warning-soft);
}

.callout.success {
  border-left-color: var(--color-success);
  background: var(--success-soft);
}

.promo-block {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 24px;
  padding: clamp(26px, 5vw, 44px);
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-medium);
  background: var(--color-panel);
  box-shadow: var(--shadow-panel);
}

.promo-block h2,
.promo-block h3 {
  margin-bottom: 8px;
}

.promo-block p {
  margin: 0;
  color: var(--color-muted);
}

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

.color-swatch {
  min-height: 120px;
  padding: 62px 14px 14px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-small);
  background: var(--swatch-color);
  color: var(--swatch-text);
  font-family: var(--font-mono);
  font-size: 11px;
}

.swatch-canvas { --swatch-color: var(--color-canvas); --swatch-text: var(--color-ink); }
.swatch-panel { --swatch-color: var(--color-panel); --swatch-text: var(--color-ink); }
.swatch-panel-strong { --swatch-color: var(--color-panel-strong); --swatch-text: var(--color-ink); }
.swatch-line { --swatch-color: var(--color-line); --swatch-text: var(--color-ink); }
.swatch-accent { --swatch-color: var(--color-accent); --swatch-text: var(--color-canvas); }
.swatch-accent-deep { --swatch-color: var(--color-accent-deep); --swatch-text: var(--color-canvas); }
.swatch-ink { --swatch-color: var(--color-ink); --swatch-text: var(--color-canvas); }
.swatch-muted { --swatch-color: var(--color-muted); --swatch-text: var(--color-canvas); }
.swatch-success { --swatch-color: var(--color-success); --swatch-text: var(--color-canvas); }
.swatch-warning { --swatch-color: var(--color-warning); --swatch-text: var(--color-canvas); }
.swatch-error { --swatch-color: var(--color-error); --swatch-text: var(--color-canvas); }

.component-stack {
  display: grid;
  gap: 24px;
}

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

.preview-section-title {
  max-width: 720px;
  margin-bottom: 42px;
}

.preview-section-title p {
  color: var(--color-muted);
}

.button-demo {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.flag-white { fill: var(--color-canvas); }
.flag-red { fill: var(--color-error); }
.flag-blue { fill: var(--color-accent-deep); }
.flag-accent { fill: var(--color-accent); }
.flag-outline { fill: none; stroke: var(--color-line); stroke-width: 1.2; }
.flag-white-stroke { fill: none; stroke: var(--color-canvas); }
.flag-red-stroke { fill: none; stroke: var(--color-error); }

@media (max-width: 1000px) {
  .platform-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (max-width: 820px) {
  .plan-grid,
  .article-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .relay-device {
    margin-top: 16px;
  }
}

@media (max-width: 640px) {
  .hero {
    padding-top: 24px;
  }

  .hero-description {
    font-size: 14px;
  }

  .trust-row {
    align-items: stretch;
  }

  .trust-row .chip {
    justify-content: center;
  }

  .relay-device {
    width: 160%;
    max-width: none;
    margin-left: -30%;
  }

  .platform-row,
  .flag-row {
    gap: 12px 18px;
  }

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

  .promo-block {
    grid-template-columns: minmax(0, 1fr);
  }

  .promo-block .btn-primary {
    width: 100%;
  }

  .plan-card,
  .article-card {
    padding: 22px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .svg-packet {
    animation: none;
    opacity: 0.85;
  }
}