:root {
  --sky-1: #2a6df5;
  --sky-2: #1448c7;
  --sky-3: #0a2570;
  --ink: #0c1733;
  --ink-soft: #4a5878;
  --paper: #f7f8fb;
  --paper-line: #e3e7f0;
  --link: #1448c7;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, sans-serif;
  font-size: 17px;
  line-height: 1.55;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---- Hero (gradient blue, matches app icon) ---- */

.hero {
  position: relative;
  background:
    radial-gradient(circle at 30% 0%, var(--sky-1) 0%, var(--sky-2) 50%, var(--sky-3) 100%);
  color: #fff;
  padding: 4rem 1.5rem 3rem;
  text-align: center;
  overflow: hidden;
}

.hero::before {
  /* Soft cloud silhouettes drifting in the corners */
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 200px 60px at 12% 70%, rgba(255,255,255,0.10), transparent 70%),
    radial-gradient(ellipse 260px 80px at 88% 30%, rgba(255,255,255,0.08), transparent 70%);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  max-width: 720px;
  margin: 0 auto;
}

.hero img.icon {
  width: 128px;
  height: 128px;
  border-radius: 28px;
  box-shadow:
    0 18px 40px rgba(10, 30, 90, 0.45),
    0 4px 8px rgba(10, 30, 90, 0.25);
  display: block;
  margin: 0 auto 1.4rem;
}

.hero h1 {
  font-size: 2.4rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0 0 0.4rem;
}

.hero .tagline {
  font-size: 1.15rem;
  font-weight: 400;
  opacity: 0.85;
  margin: 0;
}

/* ---- Page chrome (back link on subpages) ---- */

.topbar {
  background: linear-gradient(180deg, var(--sky-2), var(--sky-3));
  color: #fff;
  padding: 1rem 1.5rem;
}
.topbar .topbar-inner {
  max-width: 720px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1rem;
}
.topbar a {
  color: #fff;
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.topbar a:hover { text-decoration: none; opacity: 0.85; }
.topbar img.icon {
  width: 32px;
  height: 32px;
  border-radius: 7px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.25);
}

/* ---- Main content ---- */

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 3rem 1.5rem 2rem;
}

main h2 {
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 2.5rem 0 0.6rem;
  color: var(--ink);
}

main h2:first-child { margin-top: 0; }

main p, main ul {
  margin: 0.7rem 0;
}

main ul {
  padding-left: 1.2rem;
}

main li {
  margin: 0.35rem 0;
}

.muted { color: var(--ink-soft); font-size: 0.95rem; }

/* ---- Feature grid on home ---- */

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
  margin: 2.5rem 0 1rem;
}

.feature {
  background: #fff;
  border: 1px solid var(--paper-line);
  border-radius: 14px;
  padding: 1.25rem 1.25rem 1.1rem;
}

.feature h3 {
  font-size: 1rem;
  font-weight: 600;
  margin: 0 0 0.35rem;
  color: var(--ink);
}

.feature p {
  margin: 0;
  font-size: 0.95rem;
  color: var(--ink-soft);
  line-height: 1.5;
}

/* ---- Footer ---- */

footer {
  border-top: 1px solid var(--paper-line);
  margin-top: 3rem;
  padding: 1.5rem;
  text-align: center;
  color: var(--ink-soft);
  font-size: 0.9rem;
}
footer a { color: var(--ink-soft); margin: 0 0.6rem; }
footer a:hover { color: var(--ink); }