:root {
  color-scheme: light;
  --color-bg: #f6f8fb;
  --color-panel: #ffffff;
  --color-fg: #101827;
  --color-muted: #526174;
  --color-accent: #1a6dcc;
  --color-accent-dark: #145aa8;
  --color-border: #d9e2ef;
  --color-shadow: rgba(16, 24, 39, 0.12);
  --radius-large: 28px;
  --radius-medium: 18px;
  --content-width: 1120px;
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at top left, rgba(26, 109, 204, 0.16), transparent 32rem),
    var(--color-bg);
  color: var(--color-fg);
  line-height: 1.6;
}

body,
button,
input {
  font: inherit;
}

a {
  color: var(--color-accent);
}

a:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 4px;
  border-radius: 8px;
}

.site-header,
main,
.site-footer {
  width: min(var(--content-width), calc(100% - 32px));
  margin-inline: auto;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 22px 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--color-fg);
  font-weight: 800;
  text-decoration: none;
}

.brand img {
  border-radius: 8px;
}

nav {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 10px 18px;
}

nav a {
  color: var(--color-muted);
  font-weight: 650;
  text-decoration: none;
}

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

.hero {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  align-items: center;
  min-height: 66vh;
  padding: 48px 0 28px;
}

.hero-copy h1 {
  max-width: 760px;
  margin: 0;
  font-size: clamp(2.6rem, 9vw, 5.4rem);
  line-height: 0.96;
  letter-spacing: -0.07em;
}

.hero-text {
  max-width: 660px;
  margin: 24px 0 0;
  color: var(--color-muted);
  font-size: clamp(1.05rem, 2.2vw, 1.25rem);
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--color-accent);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.hero-actions,
.download-grid,
.source-panel {
  display: grid;
  gap: 14px;
}

.hero-actions {
  grid-template-columns: 1fr;
  margin-top: 28px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 12px 20px;
  border-radius: 999px;
  font-weight: 800;
  text-align: center;
  text-decoration: none;
}

.button.primary {
  background: var(--color-accent);
  color: #ffffff;
  box-shadow: 0 16px 36px rgba(26, 109, 204, 0.22);
}

.button.primary:hover {
  background: var(--color-accent-dark);
}

.button.secondary {
  border: 1px solid var(--color-border);
  background: rgba(255, 255, 255, 0.72);
  color: var(--color-fg);
}

.button[aria-disabled="true"] {
  cursor: not-allowed;
  opacity: 0.62;
}

.hero-card,
.panel {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-large);
  background: rgba(255, 255, 255, 0.84);
  box-shadow: 0 24px 80px var(--color-shadow);
}

.hero-card {
  display: grid;
  place-items: center;
  gap: 18px;
  padding: 28px;
}

.app-icon {
  width: 160px;
  height: 160px;
  border-radius: 36px;
}

.hero-card ul,
.steps {
  margin: 0;
  padding-left: 1.2rem;
}

.hero-card li,
.steps li {
  margin: 10px 0;
}

.panel {
  margin: 24px 0;
  padding: clamp(24px, 5vw, 42px);
}

.section-heading {
  max-width: 680px;
}

.section-heading h2,
.panel h2 {
  margin: 0;
  font-size: clamp(2rem, 5vw, 3.2rem);
  line-height: 1.05;
  letter-spacing: -0.04em;
}

.section-heading p,
.panel p {
  color: var(--color-muted);
}

.download-grid {
  grid-template-columns: 1fr;
  margin-top: 24px;
}

.download-card {
  display: grid;
  gap: 10px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-medium);
  padding: 24px;
  background: var(--color-panel);
}

.download-card h3 {
  margin: 0;
  font-size: 1.45rem;
}

.download-card p {
  margin: 0;
}

.subtle-link {
  justify-self: center;
  color: var(--color-muted);
  font-weight: 700;
  text-decoration: none;
}

.subtle-link:hover {
  color: var(--color-accent);
}

.split,
.source-panel {
  align-items: center;
}

.donate-box {
  display: grid;
  gap: 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-medium);
  padding: 22px;
  background: var(--color-panel);
}

.donate-box p {
  margin: 0;
  font-size: 0.95rem;
}

.steps {
  margin-top: 22px;
  padding-left: 1.35rem;
}

.steps strong {
  display: block;
  color: var(--color-fg);
}

.site-footer {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 34px 0 42px;
  color: var(--color-muted);
  font-size: 0.95rem;
}

.site-footer p {
  margin: 0;
}

.site-footer a {
  font-weight: 700;
}

@media (min-width: 720px) {
  .hero {
    grid-template-columns: minmax(0, 1.35fr) minmax(300px, 0.65fr);
    padding-top: 72px;
  }

  .hero-actions {
    grid-template-columns: repeat(2, max-content);
  }

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

  .site-footer {
    flex-direction: row;
    justify-content: space-between;
  }
}

@media (max-width: 719px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
  }

  nav {
    justify-content: flex-start;
  }
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --color-bg: #0c1118;
    --color-panel: #141b25;
    --color-fg: #edf3fb;
    --color-muted: #a8b4c4;
    --color-accent: #5da4f0;
    --color-accent-dark: #8abfff;
    --color-border: #273344;
    --color-shadow: rgba(0, 0, 0, 0.42);
  }

  .button.primary {
    color: #07111d;
  }

  .button.secondary,
  .hero-card,
  .panel {
    background: rgba(20, 27, 37, 0.86);
  }
}