.brand {
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: var(--size-step-1);
  letter-spacing: var(--tracking-tight);
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
}

.brand-mark {
  width: 48px;
  height: 48px;
  display: inline-block;
  object-fit: contain;
  transform-origin: center center;
  animation: brand-intro 1400ms cubic-bezier(0.16, 1, 0.3, 1) 200ms 1 both;
  will-change: transform;
}

@keyframes brand-intro {
  from { transform: rotate(0deg); }
  to   { transform: rotate(1080deg); }
}

.brand-mark:hover { animation: brand-spin 600ms cubic-bezier(0.22, 1, 0.36, 1); }

@keyframes brand-spin {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}

.nav {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.nav a {
  color: var(--color-muted);
  font-size: var(--size-step-0);
  transition: color var(--motion-fast) var(--ease-out);
}

.nav a:hover, .nav a:focus-visible { color: var(--color-fg); }

.nav .nav-try {
  display: inline-flex;
  align-items: center;
  padding: 0.4rem 0.85rem;
  min-height: 36px;
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-1);
  color: var(--color-accent);
  font-weight: 500;
  font-size: var(--size-step--1);
  letter-spacing: 0;
  white-space: nowrap;
  flex-shrink: 0;
  transition: background var(--motion-fast) var(--ease-out),
              color var(--motion-fast) var(--ease-out),
              transform var(--motion-fast) var(--ease-out);
}

.nav .nav-try:hover,
.nav .nav-try:focus-visible {
  background: var(--color-accent);
  color: var(--color-bg);
  transform: translateY(-1px);
}

.lang-switch {
  position: relative;
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--size-step--1);
  letter-spacing: var(--tracking-mono);
}

.lang-switch-button {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0.7rem;
  min-height: 36px;
  border: var(--hairline);
  border-radius: var(--radius-1);
  background: var(--color-surface);
  color: var(--color-fg);
  text-transform: uppercase;
  list-style: none;
  transition: border-color var(--motion-fast) var(--ease-out);
}

.lang-switch-button::-webkit-details-marker { display: none; }
.lang-switch-button::marker { display: none; content: ""; }

.lang-switch-button:hover { border-color: var(--color-border-strong); }

.lang-switch-menu {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  min-width: 220px;
  background: var(--color-surface);
  border: var(--hairline);
  border-radius: var(--radius-2);
  padding: var(--space-1);
  box-shadow: 0 1px 0 var(--color-border);
  display: none;
  z-index: 60;
}

.lang-switch[open] .lang-switch-menu { display: block; }

.lang-switch-menu button {
  display: block;
  width: 100%;
  text-align: left;
  padding: 0.55rem 0.7rem;
  font-family: var(--font-sans);
  font-size: var(--size-step-0);
  letter-spacing: normal;
  text-transform: none;
  color: var(--color-fg);
  border-radius: var(--radius-1);
  transition: background var(--motion-fast) var(--ease-out);
}

.lang-switch-menu button:hover,
.lang-switch-menu button[aria-current="true"] {
  background: var(--color-bg);
}

.hero-display {
  font-size: var(--size-display);
  font-weight: 700;
  letter-spacing: var(--tracking-display);
  line-height: var(--leading-tight);
  max-width: 18ch;
  visibility: hidden;
}

.hero-display.is-split { visibility: visible; }

.hero-display .word {
  display: inline-block;
  opacity: 0;
  transform: translateY(0.4em);
  will-change: transform, opacity;
}

.hero-display.is-revealed .word {
  opacity: 1;
  transform: none;
}

.hero-display .word-emphasis {
  position: relative;
}

.word-underline {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -0.08em;
  width: 100%;
  height: 0.22em;
  color: var(--color-accent);
  pointer-events: none;
  overflow: visible;
}

.word-underline path {
  stroke-dasharray: 320;
  stroke-dashoffset: 320;
  transition: stroke-dashoffset 900ms cubic-bezier(0.65, 0, 0.35, 1);
}

.hero-display.is-underlined .word-underline path {
  stroke-dashoffset: 0;
}

@media (prefers-reduced-motion: reduce) {
  .word-underline path { transition: none; }
}

.hero-sub {
  font-size: var(--size-step-2);
  color: var(--color-muted);
  font-weight: 400;
  max-width: var(--measure);
  line-height: var(--leading-snug);
}

.section-title {
  font-size: var(--size-step-4);
  font-weight: 700;
  letter-spacing: var(--tracking-tight);
  max-width: 18ch;
}

.section-lede {
  font-size: var(--size-step-1);
  color: var(--color-muted);
  max-width: var(--measure);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1.25rem;
  border-radius: var(--radius-2);
  font-weight: 500;
  font-size: var(--size-step-0);
  letter-spacing: -0.005em;
  border: 1px solid transparent;
  transition: background var(--motion-fast) var(--ease-out),
              border-color var(--motion-fast) var(--ease-out),
              color var(--motion-fast) var(--ease-out),
              transform var(--motion-fast) var(--ease-out);
  will-change: transform;
}

.button:active { transform: translateY(1px); }

.button-primary {
  background: var(--color-fg);
  color: var(--color-bg);
}

.button-primary:hover { background: var(--color-accent); }

.button-secondary {
  background: var(--color-surface);
  color: var(--color-fg);
  border-color: var(--color-border-strong);
}

.button-secondary:hover { border-color: var(--color-fg); }

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--color-accent);
  font-weight: 500;
}

.link-arrow::after {
  content: "→";
  transition: transform var(--motion-fast) var(--ease-out);
}

.link-arrow:hover::after { transform: translateX(3px); }

.download-card {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: var(--space-3);
  background: var(--color-surface);
  border: var(--hairline);
  border-radius: var(--radius-2);
  transition: border-color var(--motion-fast) var(--ease-out),
              transform var(--motion-fast) var(--ease-out);
}

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

.download-card .os {
  font-family: var(--font-mono);
  font-size: var(--size-step--1);
  color: var(--color-muted);
  letter-spacing: var(--tracking-mono);
  text-transform: uppercase;
}

.download-card .file {
  font-size: var(--size-step-1);
  font-weight: 600;
  word-break: break-all;
}

.download-card .meta {
  font-size: var(--size-step--1);
  color: var(--color-subtle);
}

[data-platform="windows"] .download-card[data-os="windows"],
[data-platform="mac"] .download-card[data-os="mac"],
[data-platform="linux"] .download-card[data-os="linux"] {
  border-color: var(--color-fg);
}

.feature-diagram {
  aspect-ratio: 4 / 3;
  border: var(--hairline);
  border-radius: var(--radius-2);
  background: var(--color-surface);
  padding: var(--space-4);
  display: grid;
  place-items: center;
  color: var(--color-fg);
}

.feature-diagram svg { width: 100%; height: 100%; }

.architecture {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
  gap: var(--space-5);
  align-items: start;
}

.architecture-diagram {
  background: var(--color-surface);
  border: var(--hairline);
  border-radius: var(--radius-2);
  padding: var(--space-3);
  position: sticky;
  top: 112px;
}

.architecture-diagram img { width: 100%; height: auto; }

.architecture-pillars {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.pillar {
  padding-block: var(--space-2);
  border-top: var(--hairline);
}

.pillar:first-child { border-top: 0; padding-top: 0; }

.pillar-marker {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--size-step--1);
  letter-spacing: var(--tracking-mono);
  color: var(--color-accent);
  margin-bottom: var(--space-1);
}

.pillar h3 {
  font-size: var(--size-step-2);
  font-weight: 600;
  letter-spacing: var(--tracking-tight);
  margin-bottom: var(--space-2);
}

.pillar p {
  color: var(--color-muted);
  font-size: var(--size-step-0);
  line-height: var(--leading-body);
  max-width: var(--measure);
}

.pillar code {
  font-family: var(--font-mono);
  font-size: 0.92em;
  padding: 0.05em 0.35em;
  background: var(--color-bg);
  border: var(--hairline);
  border-radius: 3px;
  color: var(--color-fg);
}

@media (max-width: 880px) {
  .architecture { grid-template-columns: 1fr; }
  .architecture-diagram { position: static; }
}

.feature-copy h3 {
  font-size: var(--size-step-3);
  font-weight: 700;
  letter-spacing: var(--tracking-tight);
  margin-bottom: var(--space-2);
}

.feature-copy p {
  color: var(--color-muted);
  font-size: var(--size-step-1);
  line-height: var(--leading-body);
}

.header-stats-link {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  color: inherit;
  border-radius: var(--radius-1);
  padding: 4px 8px;
  margin: -4px 4px -4px -8px;
  transition: background var(--motion-fast) var(--ease-out);
}

.header-stats-link:hover { background: var(--color-bg); }
.header-stats-link:hover .stat-label { color: var(--color-fg); }

.header-stats {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin: 0;
  padding-right: var(--space-3);
  border-right: var(--hairline);
}

.header-stats li {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
}

.header-stats .stat-value {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-fg);
  letter-spacing: -0.01em;
  display: inline-flex;
  align-items: baseline;
  gap: 0.2rem;
}

.header-stats .stat-value .unit {
  font-size: 0.65em;
  color: var(--color-muted);
  font-weight: 400;
  letter-spacing: var(--tracking-mono);
  text-transform: uppercase;
}

.header-stats .stat-label {
  margin-top: 2px;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: var(--tracking-mono);
  text-transform: uppercase;
  color: var(--color-muted);
}

.header-stats li[data-stat="peers"] .stat-value { color: var(--color-accent); }
.header-stats li[data-stat="peers"].stat-error .stat-value { color: var(--color-subtle); }
.header-stats li[data-stat="peers"].stat-error .stat-label { color: var(--color-subtle); }

@media (max-width: 960px) {
  .header-stats > li:not([data-stat="peers"]) { display: none; }
  .header-stats { gap: 0; border-right: 0; padding-right: 0; }
  .header-stats-link { padding: 4px 6px; margin: -4px 0 -4px 8px; }

  .header-stats li[data-stat="peers"] {
    flex-direction: row;
    align-items: baseline;
    gap: 6px;
  }
  .header-stats li[data-stat="peers"] .stat-value { font-size: 0.85rem; }
  .header-stats li[data-stat="peers"] .stat-label { margin-top: 0; }
}

.cta-card {
  background: var(--color-surface);
  border: var(--hairline);
  border-radius: var(--radius-2);
  padding: var(--space-5);
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(0, 1fr);
  align-items: center;
  gap: var(--space-4);
}

@media (max-width: 720px) {
  .cta-card { grid-template-columns: 1fr; }
}

.cta-card h3 {
  font-size: var(--size-step-3);
  font-weight: 700;
  letter-spacing: var(--tracking-tight);
  margin-bottom: var(--space-1);
}

.cta-card p {
  color: var(--color-muted);
  margin: 0;
}

.footer-heading {
  font-family: var(--font-mono);
  font-size: var(--size-step--1);
  color: var(--color-muted);
  letter-spacing: var(--tracking-mono);
  text-transform: uppercase;
  margin-bottom: var(--space-2);
}

.footer-links a {
  display: block;
  padding-block: 0.25rem;
  color: var(--color-fg);
  transition: color var(--motion-fast) var(--ease-out);
}

.footer-links a:hover { color: var(--color-accent); }

.colophon {
  margin-top: var(--space-5);
  padding-top: var(--space-3);
  border-top: var(--hairline);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-2);
  color: var(--color-subtle);
  font-size: var(--size-step--1);
}

.kbd {
  font-family: var(--font-mono);
  font-size: 0.85em;
  padding: 0.1em 0.4em;
  border: var(--hairline);
  border-radius: 3px;
  background: var(--color-surface);
  color: var(--color-muted);
}

.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity var(--motion-slow) var(--ease-out),
              transform var(--motion-slow) var(--ease-out);
}

.reveal.is-visible { opacity: 1; transform: none; }

@media (max-width: 880px) {
  .feature-diagram { aspect-ratio: 16 / 10; padding: var(--space-3); }
  .feature-copy h3 { font-size: var(--size-step-2); }
  .feature-copy p { font-size: var(--size-step-0); }
}

@media (max-width: 640px) {
  .nav { gap: var(--space-2); }
  .nav > a { font-size: var(--size-step--1); }
  .brand { font-size: var(--size-step-0); }

  .hero-display { font-size: clamp(2.25rem, 9vw, 3.5rem); max-width: none; }
  .hero-sub { font-size: var(--size-step-1); }

  .section-title { font-size: var(--size-step-3); max-width: none; }
  .section-lede { font-size: var(--size-step-0); }

  .feature-copy h3 { font-size: var(--size-step-2); }
  .feature-diagram { aspect-ratio: 4 / 3; padding: var(--space-2); }

  .download-grid { grid-template-columns: 1fr; }
  .download-card { padding: var(--space-2) var(--space-3); }

  .cta-card { padding: var(--space-3); }
  .cta-card h3 { font-size: var(--size-step-2); }

  .button { width: 100%; }
  .cluster { width: 100%; }
  .cluster .button { flex: 1 1 auto; min-width: 0; }
  .cluster .link-arrow { width: 100%; justify-content: center; padding-block: 0.6rem; }

  .lang-switch-menu { min-width: 180px; max-height: 60vh; overflow-y: auto; }

  .colophon { font-size: 0.72rem; flex-direction: column; align-items: flex-start; gap: var(--space-1); }
  .colophon .kbd { word-break: break-all; max-width: 100%; }
}

@media (max-width: 420px) {
  .nav > a:not(.lang-switch a):not(.header-stats-link):not(.nav-try) { display: none; }
  .nav .nav-try {
    padding: 0.3rem 0.6rem;
    min-height: 32px;
    font-size: 0.72rem;
  }
  .nav .lang-switch { margin-left: auto; }
  .brand span { font-size: var(--size-step-0); }
  .header-stats li[data-stat="peers"] .stat-value { font-size: 0.78rem; }
  .header-stats li[data-stat="peers"] .stat-label { font-size: 0.58rem; }
}