:root {
  --green-900: #0f3d16;
  --green-800: #14532d;
  --green-700: #1b5e20;
  --green-600: #2e7d32;
  --ink: #101418;
  --ink-soft: #3c444c;
  --paper: #ffffff;
  --paper-alt: #f1f6f1;
  --border: #ced6d0;
  --focus: #0b57d0;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(16, 20, 24, 0.12);
  --maxw: 1080px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family:
    system-ui,
    -apple-system,
    "Segoe UI",
    Roboto,
    Helvetica,
    Arial,
    sans-serif;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.6;
  font-size: 18px;
}

h1,
h2,
h3 {
  line-height: 1.2;
  margin: 0 0 0.5em;
}

h1 {
  font-size: clamp(2.1rem, 5vw, 3.4rem);
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(1.5rem, 3vw, 2.1rem);
}

h3 {
  font-size: 1.15rem;
}

p {
  margin: 0 0 1rem;
}

a {
  color: var(--green-700);
}

a:focus-visible,
.btn:focus-visible,
.skip-link:focus {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
  border-radius: 6px;
}

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  background: var(--paper-alt);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.1em 0.4em;
  font-size: 0.95em;
}

.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* Skip link */
.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--green-700);
  color: #fff;
  padding: 0.75rem 1rem;
  z-index: 100;
}

.skip-link:focus {
  left: 0.5rem;
  top: 0.5rem;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  z-index: 50;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-top: 0.75rem;
  padding-bottom: 0.75rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 700;
  font-size: 1.15rem;
}

.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 2.1rem;
  height: 2.1rem;
  border-radius: 10px;
  background: var(--green-700);
  color: #fff;
  font-size: 0.9rem;
  letter-spacing: 0.02em;
}

.nav-list {
  display: flex;
  gap: 1.25rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-list a {
  color: var(--ink-soft);
  text-decoration: none;
  font-weight: 600;
  padding: 0.35rem 0.25rem;
}

.nav-list a:hover {
  color: var(--green-700);
  text-decoration: underline;
}

/* Hero */
.hero {
  background:
    radial-gradient(1200px 500px at 50% -10%, #e3f2e4 0%, transparent 70%),
    var(--paper);
  padding: clamp(2.5rem, 7vw, 5rem) 0 clamp(2rem, 5vw, 3.5rem);
}

.hero-inner {
  max-width: 820px;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--green-700);
  margin-bottom: 1rem;
}

.lead {
  font-size: clamp(1.05rem, 2.2vw, 1.3rem);
  color: var(--ink-soft);
  max-width: 60ch;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin: 1.75rem 0 0.9rem;
}

.cta-note {
  color: var(--ink-soft);
  font-size: 0.95rem;
  max-width: 60ch;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 56px;
  padding: 0.85rem 1.4rem;
  border-radius: var(--radius);
  border: 2px solid transparent;
  font-size: 1.05rem;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  transition:
    transform 0.06s ease,
    background 0.15s ease,
    opacity 0.15s ease;
}

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

.btn-icon {
  font-size: 1.1em;
  line-height: 1;
}

.btn-primary {
  background: var(--green-700);
  color: #fff;
}

.btn-primary:hover {
  background: var(--green-800);
}

.btn-secondary {
  background: #fff;
  color: var(--green-800);
  border-color: var(--green-700);
}

.btn-secondary:hover {
  background: var(--paper-alt);
}

.btn-ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--border);
}

.btn-ghost:hover {
  background: var(--paper-alt);
}

.btn-block {
  width: 100%;
}

.btn[aria-disabled="true"] {
  opacity: 0.55;
  cursor: not-allowed;
  pointer-events: none;
}

/* Sections */
.section {
  padding: clamp(2.5rem, 6vw, 4.5rem) 0;
}

.section-alt {
  background: var(--paper-alt);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.section-lead {
  color: var(--ink-soft);
  max-width: 62ch;
  font-size: 1.05rem;
}

/* Features */
.features {
  list-style: none;
  margin: 2rem 0 0;
  padding: 0;
  display: grid;
  gap: 1.25rem;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.feature {
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.4rem;
  box-shadow: var(--shadow);
}

.feature h3 {
  color: var(--green-800);
}

.feature p {
  margin: 0;
  color: var(--ink-soft);
}

/* Download */
.download-grid {
  list-style: none;
  margin: 2rem 0 0;
  padding: 0;
  display: grid;
  gap: 1.25rem;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.download-card {
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.6rem;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
}

.download-card h3 {
  margin-bottom: 0.35rem;
}

.download-card p {
  color: var(--ink-soft);
}

.download-card .btn {
  margin-top: auto;
}

.hint {
  font-size: 0.9rem;
  color: var(--ink-soft);
  margin: 0.75rem 0 0;
}

/* Steps */
.steps {
  list-style: none;
  counter-reset: step;
  margin: 2rem 0 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.steps li {
  counter-increment: step;
  position: relative;
  padding: 1.1rem 1.25rem 1.1rem 4rem;
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.steps li::before {
  content: counter(step);
  position: absolute;
  left: 1rem;
  top: 1rem;
  width: 2rem;
  height: 2rem;
  display: grid;
  place-items: center;
  border-radius: 999px;
  background: var(--green-700);
  color: #fff;
  font-weight: 700;
}

.steps h3 {
  margin-bottom: 0.2rem;
}

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

/* Footer */
.site-footer {
  background: var(--green-900);
  color: #dfe9e0;
  padding: 2rem 0;
}

.footer-inner p {
  margin: 0 0 0.35rem;
}

.footer-fine {
  color: #a9c3ab;
  font-size: 0.92rem;
}

@media (max-width: 560px) {
  .nav-list {
    display: none;
  }

  .cta-row .btn {
    width: 100%;
  }
}

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

  .btn {
    transition: none;
  }
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #f2f4f5;
    --ink-soft: #c2c9cf;
    --paper: #101418;
    --paper-alt: #171d21;
    --border: #2c343b;
  }

  .site-header {
    background: rgba(16, 20, 24, 0.92);
  }

  .btn-secondary {
    background: #171d21;
    color: #bfe6c3;
  }

  .feature,
  .steps li {
    background: #141a1e;
  }

  .download-card {
    background: #141a1e;
  }

  .brand-mark,
  .steps li::before {
    background: var(--green-600);
  }

  .btn-primary {
    background: var(--green-600);
  }

  a {
    color: #8fd694;
  }
}