/* Root tokens */
:root {
  --bg: #0f1115;
  --bg-elev: #151822;
  --text: #e6e9ef;
  --muted: #a8b0bf;
  --accent: #6ee7ff;
  --accent-ink: #081217;
  --card: #131726;
  --outline: #2a3242;

  --radius: 12px;
  --shadow: 0 6px 24px rgba(0, 0, 0, 0.25);
  --maxw: 1120px;

  --step-1: clamp(1.125rem, 1rem + 0.5vw, 1.25rem);
  --step-2: clamp(1.375rem, 1.1rem + 1vw, 1.75rem);
  --step-3: clamp(2rem, 1.6rem + 2vw, 2.75rem);

  color-scheme: dark light;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #ffffff;
    --bg-elev: #f7f9fc;
    --text: #1b2430;
    --muted: #4b5567;
    --accent: #0ea5e9;
    --accent-ink: #ffffff;
    --card: #ffffff;
    --outline: #d6dbe5;
    --shadow: 0 6px 24px rgba(0, 0, 0, 0.08);
  }
}

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

html {
  hanging-punctuation: first last;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, "Noto Sans", "Apple Color Emoji",
    "Segoe UI Emoji", "Segoe UI Symbol";
  line-height: 1.6;
  background: radial-gradient(1200px 600px at 70% -10%, #17324a 0%, transparent 60%),
    var(--bg);
  color: var(--text);
}

/* Utilities */
.container {
  max-width: var(--maxw);
  padding-inline: 1rem;
  margin-inline: auto;
}

.section {
  padding: 4rem 0;
}

.section-accent {
  background: linear-gradient(180deg, var(--bg-elev), transparent);
  border-top: 1px solid var(--outline);
  border-bottom: 1px solid var(--outline);
}

.section-title {
  font-size: var(--step-2);
  line-height: 1.2;
  margin: 0 0 1rem;
  letter-spacing: 0.2px;
}

.section-copy {
  color: var(--muted);
  margin: 0 0 2rem;
}

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

.grid-3 {
  grid-template-columns: 1fr;
}

@media (min-width: 720px) {
  .grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: saturate(140%) blur(8px);
  background: color-mix(in oklab, var(--bg) 88%, transparent);
  border-bottom: 1px solid var(--outline);
}

.header-inner {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 1rem;
  padding: 0.75rem 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: inherit;
  text-decoration: none;
  font-weight: 600;
  letter-spacing: 0.2px;
}

.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: color-mix(in oklab, var(--accent) 35%, transparent);
  color: var(--accent);
  font-weight: 700;
}

.brand-name {
  font-variation-settings: "wght" 650;
}

/* Navigation */
.site-nav {
  justify-self: end;
}

.nav-list {
  display: none;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: 1rem;
}

.nav-list a {
  color: var(--muted);
  text-decoration: none;
  padding: 0.5rem 0.25rem;
  border-radius: 8px;
}

.nav-list a[aria-current="page"] {
  color: var(--text);
  font-weight: 600;
}

.nav-list a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.nav-toggle {
  appearance: none;
  display: inline-grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: 10px;
  border: 1px solid var(--outline);
  background: color-mix(in oklab, var(--bg) 75%, transparent);
  color: var(--text);
}

.nav-toggle-bar {
  width: 18px;
  height: 2px;
  background: currentColor;
  position: relative;
}

.nav-toggle-bar::before,
.nav-toggle-bar::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: currentColor;
  transform-origin: center;
}

.nav-toggle-bar::before {
  top: -6px;
}
.nav-toggle-bar::after {
  top: 6px;
}

@media (min-width: 900px) {
  .nav-toggle {
    display: none;
  }
  .nav-list {
    display: flex;
  }
}

/* Mobile nav open */
.site-nav.is-open .nav-list {
  display: grid;
  position: absolute;
  top: 64px;
  left: 0;
  right: 0;
  padding: 0.75rem 1rem 1rem;
  background: var(--bg);
  border-bottom: 1px solid var(--outline);
}

/* Hero */
.hero {
  padding-top: 5rem;
}

.hero-title {
  font-size: var(--step-3);
  line-height: 1.15;
  margin: 0 0 0.75rem;
}

.hero-copy {
  color: var(--muted);
  margin: 0 0 1.5rem;
}

.hero-actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

/* Buttons */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  border-radius: 10px;
  text-decoration: none;
  font-weight: 600;
  border: 1px solid var(--outline);
  color: var(--text);
  background: transparent;
}

.button-primary {
  background: linear-gradient(180deg, var(--accent), color-mix(in oklab, var(--accent) 70%, black));
  border-color: transparent;
  color: var(--accent-ink);
}

.button-ghost {
  background: color-mix(in oklab, var(--bg) 75%, transparent);
}

/* Cards */
.card,
.step-card {
  background: linear-gradient(180deg, color-mix(in oklab, var(--card) 85%, transparent), var(--card));
  border: 1px solid var(--outline);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.25rem;
  min-height: 180px;
}

.card-title {
  margin: 0 0 0.5rem;
  font-weight: 650;
  letter-spacing: 0.2px;
}

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

/* Steps */
.steps .step-card {
  position: relative;
}

.step-kicker {
  margin: 0 0 0.25rem;
  font-size: 0.9rem;
  color: var(--accent);
  letter-spacing: 0.3em;
}

.step-title {
  margin: 0 0 0.5rem;
}

/* CTA */
.cta-form {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin: 1rem 0 0.5rem;
}

.cta-form input[type="email"] {
  flex: 1 1 280px;
  padding: 0.75rem 0.9rem;
  border: 1px solid var(--outline);
  border-radius: 10px;
  background: color-mix(in oklab, var(--bg) 85%, transparent);
  color: var(--text);
}

.cta-form input::placeholder {
  color: color-mix(in oklab, var(--muted) 70%, transparent);
}

.fine-print {
  font-size: 0.875rem;
  color: var(--muted);
}

/* Footer */
.site-footer {
  padding: 2.5rem 0;
  border-top: 1px solid var(--outline);
  background: color-mix(in oklab, var(--bg) 92%, transparent);
}

.footer-inner {
  display: grid;
  gap: 1rem;
  grid-template-columns: 1fr;
}

.footer-brand {
  margin: 0;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.footer-links {
  list-style: none;
  padding: 0;
  display: flex;
  gap: 1rem;
  margin: 0;
}

@media (min-width: 720px) {
  .footer-inner {
    grid-template-columns: 1fr auto auto;
    align-items: center;
  }
}

/* Reveal animation (progressive; respects reduced motion) */
.reveal {
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 500ms ease, transform 500ms ease;
}

.is-visible {
  opacity: 1;
  transform: translateY(0);
}

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

/* Accessibility */
.skip-link {
  position: absolute;
  left: -999px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.skip-link:focus {
  left: 1rem;
  top: 1rem;
  width: auto;
  height: auto;
  padding: 0.5rem 0.75rem;
  background: var(--accent);
  color: var(--accent-ink);
  border-radius: 8px;
  z-index: 100;
}

.visually-hidden {
  position: absolute !important;
  height: 1px; width: 1px;
  overflow: hidden; clip: rect(1px, 1px, 1px, 1px);
  white-space: nowrap; border: 0; padding: 0; margin: -1px;
}

/* Focus outlines */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Links */
a {
  color: inherit;
}

/* Forms */
input, button {
  font: inherit;
}

/* Misc */
img {
  max-width: 100%;
  height: auto;
  display: block;
}