:root {
  --bg: #ffffff;
  --fg: #050505;
  --muted: #5e5e5e;
  --line: #d8d8d8;
  --panel: #f3f3f3;
  --panel-strong: #0c0c0c;
  --shadow: 0 18px 60px rgba(0, 0, 0, 0.08);
  --radius-lg: 28px;
  --radius-md: 20px;
  --radius-sm: 14px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Helvetica Neue", Arial, sans-serif;
  font-size: 18px;
  color: var(--fg);
  background:
    linear-gradient(180deg, #ffffff 0%, #fafafa 42%, #f2f2f2 100%);
}

a {
  color: inherit;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -3rem;
  z-index: 20;
  padding: 0.8rem 1rem;
  border-radius: 999px;
  background: #000;
  color: #fff;
  text-decoration: none;
}

.skip-link:focus {
  top: 1rem;
}

code,
pre {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

.shell {
  width: min(1180px, calc(100% - 2rem));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(18px);
  background: rgba(255, 255, 255, 0.8);
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}

.header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 0;
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.brand {
  font-size: 0.95rem;
  font-weight: 800;
  letter-spacing: 0.18em;
  text-decoration: none;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1.1rem;
}

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

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

.lang-switcher {
  display: inline-flex;
  padding: 0.2rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.9);
}

.lang-button {
  border: 0;
  background: transparent;
  color: var(--muted);
  padding: 0.5rem 0.8rem;
  border-radius: 999px;
  font: inherit;
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  cursor: pointer;
}

.lang-button.is-active {
  background: #000;
  color: #fff;
}

a:focus-visible,
button:focus-visible {
  outline: 3px solid #000;
  outline-offset: 3px;
}

.hero {
  padding: 3rem 0 2rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(320px, 0.9fr);
  gap: 1.25rem;
  align-items: stretch;
}

.hero-copy,
.hero-panel,
.card,
.timeline-card,
.mini-card,
.quote-box {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.86);
  box-shadow: var(--shadow);
}

.hero-copy {
  padding: 3rem;
  background:
    radial-gradient(circle at top right, rgba(0, 0, 0, 0.06), transparent 35%),
    linear-gradient(180deg, #ffffff 0%, #f6f6f6 100%);
}

.eyebrow {
  margin: 0 0 1rem;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

h1,
h2,
h3,
h4,
p,
ol,
ul {
  margin-top: 0;
}

h1 {
  max-width: 18ch;
  margin-bottom: 1.25rem;
  font-size: clamp(3rem, 8vw, 5.5rem);
  line-height: 0.98;
  letter-spacing: -0.04em;
}

h2 {
  max-width: 24ch;
  margin-bottom: 0;
  font-size: clamp(2rem, 4.5vw, 4rem);
  line-height: 0.95;
  letter-spacing: -0.04em;
}

h3 {
  margin-bottom: 0.75rem;
  font-size: 1.35rem;
  line-height: 1.1;
}

h4 {
  margin-bottom: 0.45rem;
  font-size: 1rem;
}

.hero-text,
.lead,
.card p,
.timeline-card p,
.mini-card p,
.quote-box p,
.step-list,
.plain-list {
  color: var(--muted);
  line-height: 1.65;
}

.hero-text {
  max-width: 42rem;
  font-size: 1.125rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  margin-top: 1.5rem;
}

.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.25rem;
}

.badge {
  display: inline-flex;
  align-items: center;
  min-height: 2.5rem;
  padding: 0.55rem 0.9rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.92);
  color: var(--fg);
  font-size: 0.92rem;
  font-weight: 700;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 12rem;
  padding: 0.95rem 1.3rem;
  border: 1px solid #000;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 700;
  transition: transform 160ms ease, background-color 160ms ease, color 160ms ease;
}

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

.button-primary {
  background: #000;
  color: #fff;
}

.button-secondary {
  background: #fff;
  color: #000;
}

.hero-panel {
  padding: 1.5rem;
  background: #0a0a0a;
  color: #f4f4f4;
}

.panel-label {
  margin-bottom: 1rem;
  color: #bcbcbc;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.step-list {
  margin: 0;
  padding-left: 1.25rem;
  color: #d7d7d7;
}

.step-list li + li {
  margin-top: 0.8rem;
}

.microcopy {
  margin-top: 0.85rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.microcopy-invert {
  color: #c8c8c8;
}

.trust-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.85rem;
  margin-top: 1.5rem;
}

.trust-item {
  padding: 1rem 1rem 0.95rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.82);
}

.trust-item strong {
  display: block;
  margin-bottom: 0.25rem;
  font-size: 1.15rem;
}

.trust-item span {
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.45;
}

.section {
  padding: 1.25rem 0 3.5rem;
}

.section-invert {
  background:
    linear-gradient(180deg, #111111 0%, #060606 100%);
  color: #f7f7f7;
}

.section-head {
  margin-bottom: 1.5rem;
}

.section-invert .eyebrow,
.section-invert .plain-list,
.section-invert .card p,
.section-invert .lead {
  color: #c8c8c8;
}

.grid {
  display: grid;
  gap: 1rem;
}

.grid-4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

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

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

.card {
  padding: 1.4rem;
}

.card-dark {
  background: rgba(255, 255, 255, 0.04);
  border-color: rgba(255, 255, 255, 0.14);
  box-shadow: none;
}

.card-kicker {
  margin-bottom: 0.45rem;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

.plain-list {
  margin-bottom: 0;
  padding-left: 1.15rem;
}

.plain-list li + li {
  margin-top: 0.7rem;
}

.timeline {
  display: grid;
  gap: 1rem;
}

.timeline-item {
  display: grid;
  grid-template-columns: 140px minmax(0, 1fr);
  gap: 1rem;
}

.timeline-meta {
  padding-top: 1rem;
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

.timeline-card {
  padding: 1.5rem;
}

.mini-grid,
.examples,
.simulator-grid {
  display: grid;
  gap: 1rem;
}

.mini-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 1rem;
}

.mini-card {
  padding: 1rem;
  border-radius: var(--radius-md);
  background: var(--panel);
}

.quote-box {
  margin-top: 1rem;
  padding: 1rem 1.1rem;
  background: #0d0d0d;
  color: #f7f7f7;
  border-color: #0d0d0d;
}

.quote-label {
  margin-bottom: 0.35rem;
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: #bbbbbb;
}

.examples {
  grid-template-columns: 1.1fr 0.9fr;
  margin-top: 1rem;
}

.example {
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: #fff;
}

pre {
  margin: 0;
  padding: 0.9rem;
  overflow-x: auto;
  border-radius: var(--radius-sm);
  background: #111;
  color: #f2f2f2;
  line-height: 1.55;
}

.simulator-grid {
  grid-template-columns: 1.1fr 0.9fr;
  align-items: start;
}

.persona-grid {
  margin-top: 1rem;
}

.cta-buttons {
  display: grid;
  gap: 0.85rem;
  margin-top: 1rem;
}

.button-full {
  width: 100%;
}

strong {
  color: inherit;
}

@media (max-width: 1080px) {
  .grid-4,
  .grid-3,
  .mini-grid,
  .trust-strip {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .hero-grid,
  .simulator-grid,
  .examples,
  .grid-2,
  .timeline-item {
    grid-template-columns: 1fr;
  }

  .timeline-meta {
    padding-top: 0;
  }
}

@media (max-width: 720px) {
  .header-row,
  .nav,
  .hero-actions,
  .header-controls {
    align-items: flex-start;
  }

  .header-row {
    flex-direction: column;
  }

  .header-controls {
    width: 100%;
    flex-direction: column;
  }

  .nav {
    gap: 0.8rem;
  }

  .hero-copy,
  .hero-panel,
  .card,
  .timeline-card {
    padding: 1.2rem;
  }

  .grid-4,
  .grid-3,
  .mini-grid,
  .trust-strip {
    grid-template-columns: 1fr;
  }

  h1 {
    max-width: none;
  }

  h2 {
    max-width: none;
  }

  body {
    font-size: 17px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  * {
    transition: none !important;
  }
}