:root {
  --canvas: #f8f9fa;
  --card: #ffffff;
  --ink: #1a1d20;
  --muted: #6c757d;
  --steel: #2b5278;
  --steel-soft: rgba(43, 82, 120, 0.08);
  --line: #e9ecef;
  --font: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --mono: "JetBrains Mono", SFMono-Regular, Menlo, Consolas, monospace;
  --max: 1080px;
  --pad: clamp(1.25rem, 4vw, 1.5rem);
  --radius: 12px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--canvas);
  color: var(--ink);
  font-family: var(--font);
  font-size: 1rem;
  line-height: 1.55;
}

a {
  color: var(--steel);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

a:hover {
  text-decoration: none;
}

img {
  max-width: 100%;
}

.shell {
  width: min(100% - (2 * var(--pad)), var(--max));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(248, 249, 250, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(8px);
}

.header-bar {
  display: flex;
  align-items: center;
  gap: 1rem;
  min-height: 4rem;
}

.logo {
  color: var(--ink);
  font-weight: 700;
  letter-spacing: -0.02em;
  text-decoration: none;
  white-space: nowrap;
}

.site-nav {
  display: flex;
  flex: 1;
  gap: 1.1rem;
  align-items: center;
}

.site-nav a {
  color: var(--ink);
  font-size: 0.95rem;
  text-decoration: none;
}

.site-nav a:hover {
  color: var(--steel);
}

.lang {
  margin-left: auto;
  color: var(--ink);
  font-family: var(--mono);
  font-size: 0.82rem;
  text-decoration: none;
}

.menu-toggle {
  display: none;
  margin-left: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--card);
  color: var(--ink);
  font: inherit;
  padding: 0.4rem 0.7rem;
}

.hero,
.section,
.site-footer,
.legal {
  padding-block: 4.5rem;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(280px, 0.85fr);
  gap: 3rem;
  align-items: center;
  padding-top: 4rem;
}

.badges,
.platform-notes,
.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.badges span,
.platform-notes p,
.card,
.step,
.limits,
.window {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.badges span {
  padding: 0.25rem 0.65rem;
  color: var(--steel);
  font-family: var(--mono);
  font-size: 0.78rem;
}

h1,
h2,
h3 {
  line-height: 1.2;
  letter-spacing: -0.03em;
  font-weight: 700;
}

h1 {
  margin: 1rem 0 0.75rem;
  font-size: clamp(2rem, 4vw, 3.1rem);
}

h2 {
  margin: 0 0 1.5rem;
  font-size: clamp(1.6rem, 3vw, 2rem);
}

h3 {
  margin: 0 0 0.4rem;
  font-size: 1.05rem;
}

.subtitle,
.hero-note,
.card p,
.step p,
.limits li,
.legal p,
.legal li {
  color: var(--muted);
}

.subtitle {
  margin: 0;
  max-width: 38rem;
  font-size: 1.125rem;
}

.hero-actions {
  margin-top: 1.5rem;
}

.btn-primary,
.btn-disabled {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.75rem;
  padding: 0.55rem 1rem;
  border-radius: 8px;
  font: inherit;
  font-weight: 600;
}

.btn-primary {
  background: var(--steel);
  color: #fff;
  text-decoration: none;
}

.btn-primary:hover {
  filter: brightness(1.08);
}

.btn-disabled {
  width: 100%;
  border: 1px solid var(--line);
  background: var(--canvas);
  color: var(--muted);
  cursor: not-allowed;
}

.hero-note {
  margin: 0.9rem 0 0;
  font-size: 0.92rem;
}

.window {
  padding: 1rem;
  box-shadow: 0 12px 40px rgba(26, 29, 32, 0.05);
}

.window-top,
.window-row {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
}

.window-top {
  margin-bottom: 0.9rem;
  font-weight: 700;
}

.states {
  display: flex;
  gap: 0.35rem;
  margin-bottom: 0.9rem;
}

.states span {
  padding: 0.2rem 0.45rem;
  border-radius: 999px;
  background: var(--canvas);
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.72rem;
}

.states .is-current {
  background: var(--steel-soft);
  color: var(--steel);
}

.window-row {
  padding: 0.55rem 0;
  border-top: 1px solid var(--line);
  font-size: 0.92rem;
}

.window-row code,
.node code {
  font-family: var(--mono);
  font-size: 0.82rem;
}

.node-list {
  margin: 0.4rem 0 0.9rem;
  padding: 0;
  list-style: none;
}

.node {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.45rem 0;
  border-top: 1px solid var(--line);
  color: var(--muted);
}

.steps,
.grid,
.platform-cards {
  display: grid;
  gap: 1rem;
}

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

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

.step,
.card {
  padding: 1.15rem 1.2rem;
}

.step-num {
  display: inline-block;
  margin-bottom: 0.7rem;
  color: var(--steel);
  font-family: var(--mono);
  font-size: 0.82rem;
}

.step p,
.card p {
  margin: 0;
}

.platform-notes {
  margin-top: 1rem;
}

.platform-notes p {
  margin: 0;
  padding: 0.7rem 0.9rem;
  color: var(--ink);
}

.limits {
  margin: 0;
  padding: 0.4rem 1.2rem 0.4rem 2.2rem;
}

.limits li + li {
  margin-top: 0.35rem;
}

.package {
  margin: 0 0 0.8rem;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.82rem;
}

.site-footer {
  padding-top: 2rem;
  border-top: 1px solid var(--line);
}

.site-footer p {
  margin: 0 0 0.8rem;
}

.footer-links {
  gap: 1rem;
}

.legal {
  padding-top: 2.5rem;
}

.draft {
  margin: 0 0 1.5rem;
  padding: 0.8rem 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--steel-soft);
}

.legal h1 {
  font-size: clamp(1.7rem, 3vw, 2.3rem);
}

.legal h2 {
  margin-top: 2rem;
  font-size: 1.25rem;
}

.legal ul {
  padding-left: 1.2rem;
}

@media (max-width: 900px) {
  .header-bar {
    flex-wrap: wrap;
  }

  .hero,
  .steps,
  .grid,
  .platform-cards {
    grid-template-columns: 1fr;
  }

  .menu-toggle {
    display: inline-flex;
    order: 2;
    margin-left: auto;
  }

  .lang {
    order: 3;
    margin-left: 0.75rem;
  }

  .site-nav {
    display: none;
    position: static;
    order: 4;
    flex-direction: column;
    align-items: flex-start;
    flex-basis: 100%;
    padding: 0.25rem 0 0.75rem;
    background: transparent;
    border-bottom: 0;
  }

  .site-nav.is-open {
    display: flex;
  }
}