:root {
  --navy: #032c5e;
  --navy-deep: #021a38;
  --teal: #02c3ca;
  --teal-dim: #019aa0;
  --ink: #0c1b2e;
  --ink-soft: #3a4d66;
  --paper: #f3f6f8;
  --paper-2: #e8eef3;
  --line: rgba(3, 44, 94, 0.12);
  --shadow-soft: 0 18px 40px rgba(3, 44, 94, 0.08);
  --font-display: "Syne", sans-serif;
  --font-body: "IBM Plex Sans", sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, monospace;
  --max: 1120px;
  --header-h: 64px;
  color-scheme: light;
}

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

html {
  scroll-behavior: smooth;
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.6;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
}

img {
  display: block;
  max-width: 100%;
}

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

a:hover {
  color: var(--teal-dim);
}

code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  font-weight: 500;
  color: var(--navy);
  background: rgba(2, 195, 202, 0.12);
  padding: 0.1em 0.35em;
  border-radius: 4px;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -4rem;
  z-index: 100;
  padding: 0.6rem 0.9rem;
  background: var(--navy);
  color: #fff;
  text-decoration: none;
  border-radius: 6px;
}

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

/* Header */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--header-h);
  backdrop-filter: blur(12px);
  background: rgba(243, 246, 248, 0.82);
  border-bottom: 1px solid transparent;
  transition: border-color 0.25s ease, background 0.25s ease;
}

.site-header.is-scrolled {
  border-bottom-color: var(--line);
  background: rgba(243, 246, 248, 0.94);
}

.site-header__inner {
  max-width: var(--max);
  height: 100%;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: -0.02em;
  color: var(--navy);
  text-decoration: none;
}

.brand-mark img {
  border-radius: 6px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.site-nav a {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--ink-soft);
  text-decoration: none;
}

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

.site-nav__github {
  color: var(--navy) !important;
  padding: 0.35rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.55);
}

.site-nav__github:hover {
  border-color: rgba(2, 195, 202, 0.55);
  background: #fff;
}

@media (max-width: 720px) {
  .site-nav a:not(.site-nav__github) {
    display: none;
  }
}

/* Hero — one composition, brand-first */

.hero {
  position: relative;
  min-height: calc(100svh - var(--header-h));
  display: flex;
  align-items: center;
  isolation: isolate;
}

.hero__atmosphere {
  position: absolute;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(ellipse 70% 60% at 85% 40%, rgba(2, 195, 202, 0.28), transparent 55%),
    radial-gradient(ellipse 55% 50% at 10% 80%, rgba(3, 44, 94, 0.16), transparent 50%),
    linear-gradient(165deg, #eef4f7 0%, #dce8ef 42%, #c5d8e4 100%);
  animation: atmosphere-shift 18s ease-in-out infinite alternate;
}

.hero__grid {
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(rgba(3, 44, 94, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(3, 44, 94, 0.05) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 70% 65% at 72% 48%, #000 15%, transparent 72%);
  opacity: 0.9;
}

.hero__inner {
  width: 100%;
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(2.5rem, 6vw, 4.5rem) 1.5rem;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  align-items: center;
  gap: clamp(1.5rem, 4vw, 3rem);
}

.hero__content {
  position: relative;
  z-index: 1;
  min-width: 0;
}

.hero__brand {
  margin: 0 0 1.1rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.25rem, 4.5vw, 3.4rem);
  line-height: 0.95;
  letter-spacing: -0.045em;
  color: var(--navy);
  opacity: 0;
  transform: translateY(18px);
  animation: rise-in 0.8s cubic-bezier(0.22, 1, 0.36, 1) 0.05s forwards;
}

.hero__headline {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.3rem, 2.2vw, 1.75rem);
  line-height: 1.25;
  letter-spacing: -0.03em;
  color: var(--ink);
  max-width: 24ch;
  opacity: 0;
  transform: translateY(18px);
  animation: rise-in 0.8s cubic-bezier(0.22, 1, 0.36, 1) 0.18s forwards;
}

.hero__lede {
  margin: 0 0 1.75rem;
  color: var(--ink-soft);
  max-width: 40ch;
  opacity: 0;
  transform: translateY(18px);
  animation: rise-in 0.8s cubic-bezier(0.22, 1, 0.36, 1) 0.3s forwards;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  opacity: 0;
  transform: translateY(18px);
  animation: rise-in 0.8s cubic-bezier(0.22, 1, 0.36, 1) 0.42s forwards;
}

.hero__visual {
  position: relative;
  z-index: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 0;
}

.hero__shield {
  width: min(100%, 440px);
  height: auto;
  filter: drop-shadow(0 28px 48px rgba(3, 44, 94, 0.16));
  opacity: 0;
  transform: translateY(18px);
  animation:
    rise-in 1s cubic-bezier(0.22, 1, 0.36, 1) 0.15s forwards,
    float-y 7s ease-in-out 1.25s infinite;
}

@keyframes rise-in {
  to {
    opacity: 1;
    transform: none;
  }
}

@keyframes float-y {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-12px);
  }
}

@keyframes atmosphere-shift {
  from {
    filter: hue-rotate(0deg) saturate(1);
  }
  to {
    filter: hue-rotate(-8deg) saturate(1.08);
  }
}

@media (max-width: 900px) {
  .hero {
    min-height: auto;
  }

  .hero__inner {
    grid-template-columns: 1fr;
    gap: 1.75rem;
    padding-top: 2.75rem;
    padding-bottom: 3rem;
  }

  .hero__headline {
    max-width: none;
  }

  .hero__visual {
    order: -1;
    max-width: 280px;
    margin: 0 auto;
  }

  .hero__grid {
    mask-image: radial-gradient(ellipse 100% 55% at 50% 18%, #000 12%, transparent 70%);
  }
}

/* Buttons */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  min-height: 2.75rem;
  padding: 0.65rem 1.15rem;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  border-radius: 8px;
  border: 1px solid transparent;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease,
    transform 0.2s ease;
}

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

.btn--primary {
  background: var(--navy);
  color: #f5fbfc;
}

.btn--primary:hover {
  background: var(--navy-deep);
  color: #fff;
}

.btn--ghost {
  background: rgba(255, 255, 255, 0.55);
  color: var(--navy);
  border-color: var(--line);
}

.btn--ghost:hover {
  background: #fff;
  color: var(--navy);
  border-color: rgba(2, 195, 202, 0.5);
}

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

/* Sections */

.section {
  padding: clamp(4rem, 9vw, 6.5rem) 1.5rem;
}

.section--alt {
  background:
    linear-gradient(180deg, rgba(2, 195, 202, 0.06), transparent 40%),
    linear-gradient(180deg, var(--paper-2), var(--paper));
  border-block: 1px solid var(--line);
}

.section__inner {
  max-width: var(--max);
  margin: 0 auto;
}

.section__label {
  margin: 0 0 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--teal-dim);
}

.section__title {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  line-height: 1.15;
  letter-spacing: -0.035em;
  color: var(--navy);
  max-width: 18ch;
}

.section__lede {
  margin: 0 0 2.5rem;
  color: var(--ink-soft);
  max-width: 52ch;
}

[data-reveal] {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1),
    transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}

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

/* Problem steps */

.steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.steps li {
  display: grid;
  grid-template-columns: 4.5rem 1fr;
  gap: 1.25rem;
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--line);
}

.steps__n {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--teal-dim);
  padding-top: 0.2rem;
}

.steps h3 {
  margin: 0 0 0.35rem;
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--navy);
}

.steps p {
  margin: 0;
  color: var(--ink-soft);
  max-width: 48ch;
}

/* Features */

.feature-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2rem 2.5rem;
}

.feature-list h3 {
  margin: 0 0 0.4rem;
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--navy);
}

.feature-list p {
  margin: 0;
  color: var(--ink-soft);
  max-width: 36ch;
}

@media (max-width: 700px) {
  .feature-list {
    grid-template-columns: 1fr;
    gap: 1.75rem;
  }

  .steps li {
    grid-template-columns: 3rem 1fr;
    gap: 0.85rem;
  }
}

/* Install — interactive containers */

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

.install {
  padding: 1.4rem 1.35rem 1.35rem;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: var(--shadow-soft);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.install:hover {
  border-color: rgba(2, 195, 202, 0.45);
  transform: translateY(-2px);
}

.install h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--navy);
}

.install p {
  margin: 0;
  flex: 1;
  font-size: 0.98rem;
  color: var(--ink-soft);
}

.install .btn {
  margin-top: 0.5rem;
}

.install-note {
  margin: 1.75rem 0 0;
  font-size: 0.95rem;
  color: var(--ink-soft);
  max-width: 52ch;
}

@media (max-width: 860px) {
  .install-grid {
    grid-template-columns: 1fr;
  }
}

/* Footer */

.site-footer {
  padding: 2.5rem 1.5rem 3rem;
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, var(--paper), #e4edf3);
}

.site-footer__inner {
  max-width: var(--max);
  margin: 0 auto;
  display: grid;
  gap: 0.65rem;
}

.site-footer__brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--navy);
}

.site-footer__brand img {
  border-radius: 5px;
}

.site-footer p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--ink-soft);
}

.site-footer__fine {
  font-size: 0.82rem !important;
  opacity: 0.85;
}

/* Stripe return pages */

.status-body {
  min-height: 100svh;
  display: flex;
  flex-direction: column;
}

.status {
  position: relative;
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 3rem 1.5rem 4rem;
  isolation: isolate;
}

.status__atmosphere {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(ellipse 55% 50% at 80% 20%, rgba(2, 195, 202, 0.22), transparent 55%),
    radial-gradient(ellipse 45% 40% at 15% 80%, rgba(3, 44, 94, 0.12), transparent 50%),
    linear-gradient(165deg, #eef4f7 0%, #dce8ef 50%, #c5d8e4 100%);
}

.status__panel {
  width: min(36rem, 100%);
  padding: clamp(1.75rem, 4vw, 2.5rem);
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--line);
  border-radius: 14px;
  box-shadow: var(--shadow-soft);
  backdrop-filter: blur(10px);
}

.status__label {
  margin: 0 0 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.status__label--ok {
  color: var(--teal-dim);
}

.status__title {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.75rem, 4vw, 2.35rem);
  line-height: 1.15;
  letter-spacing: -0.035em;
  color: var(--navy);
}

.status__lede {
  margin: 0 0 1rem;
  color: var(--ink-soft);
}

.status__note {
  margin: 0 0 1.75rem;
  font-size: 0.95rem;
  color: var(--ink-soft);
}

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