:root {
  --bg: #0a0a14;
  --surface: rgba(255, 255, 255, 0.04);
  --surfaceHover: rgba(255, 255, 255, 0.07);
  --border: rgba(255, 255, 255, 0.10);

  --text: rgba(240, 240, 245, 0.94);
  --muted: rgba(240, 240, 245, 0.70);
  --muted2: rgba(240, 240, 245, 0.52);

  --accent1: #6C9FFF;
  --accent2: #a855f7;
  --accent3: #22d3ee;
  --gradient: linear-gradient(135deg, var(--accent1) 0%, var(--accent2) 50%, var(--accent3) 100%);

  --radiusLg: 20px;
  --radiusMd: 14px;

  --max: 1100px;
}

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

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}

/* Ambient glow */
body::before,
body::after {
  content: "";
  position: fixed;
  pointer-events: none;
  z-index: 0;
}

body::before {
  top: -40%;
  left: -20%;
  width: 80%;
  height: 80%;
  background: radial-gradient(circle, rgba(108, 159, 255, 0.09) 0%, transparent 62%);
}

body::after {
  bottom: -30%;
  right: -20%;
  width: 70%;
  height: 70%;
  background: radial-gradient(circle, rgba(168, 85, 247, 0.07) 0%, transparent 62%);
}

/* Keep content above glow */
nav, header, section, footer { position: relative; z-index: 1; }

header, section, footer {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 24px;
}

/* Nav */
nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 10;

  display: flex;
  align-items: center;
  justify-content: space-between;

  padding: 14px 28px;
  background: rgba(10, 10, 20, 0.72);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.nav-brand {
  font-weight: 800;
  letter-spacing: -0.02em;
  font-size: 1.05rem;
  color: var(--text);
}

nav ul {
  list-style: none;
  display: flex;
  gap: 22px;
  padding: 0;
  margin: 0;
}

nav a {
  text-decoration: none;
  color: var(--muted);
  font-weight: 600;
  font-size: 0.92rem;
  transition: color 160ms ease;
}
nav a:hover { color: var(--text); }

/* Header */
header {
  padding-top: 118px; /* fixed nav offset */
  padding-bottom: 48px;
  text-align: center;
}

header h1 {
  margin: 0 0 12px;
  font-size: clamp(2.0rem, 5.2vw, 3.2rem);
  line-height: 1.1;
  letter-spacing: -0.03em;
}

header p {
  margin: 0 auto 22px;
  max-width: 720px;
  color: var(--muted);
  font-size: 1.05rem;
}

header button {
  border: 0;
  cursor: pointer;
  padding: 12px 22px;
  border-radius: var(--radiusMd);
  background: var(--gradient);
  color: #fff;
  font-weight: 700;
  font-size: 0.98rem;
  box-shadow: 0 8px 32px rgba(108, 159, 255, 0.28);
  transition: transform 160ms ease, box-shadow 160ms ease;
}
header button:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 44px rgba(108, 159, 255, 0.34);
}

/* App grid */
.features-grid {
  padding: 28px 24px 10px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
}

/* Cards */
.app-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radiusLg);
  padding: 22px;
  box-shadow: 0 10px 38px rgba(0, 0, 0, 0.22);
  transition: transform 200ms ease, background 200ms ease, box-shadow 200ms ease;
}
.app-card:hover {
  background: var(--surfaceHover);
  transform: translateY(-3px);
  box-shadow: 0 18px 56px rgba(0, 0, 0, 0.34);
}

.app-card h2 {
  margin: 0 0 10px;
  font-size: 1.2rem;
  letter-spacing: -0.02em;
}

.app-card p {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 0.95rem;
}

.app-card strong { color: var(--text); }

.app-card ul {
  margin: 10px 0 14px;
  padding-left: 18px;
  color: var(--muted);
}
.app-card li { margin: 6px 0; }

/* App buttons */
.app-button {
  display: inline-block;
  margin-top: 6px;
  padding: 11px 14px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border);
  color: var(--accent1);
  text-decoration: none;
  font-weight: 800;
  font-size: 0.92rem;
  transition: background 160ms ease, border-color 160ms ease, color 160ms ease, transform 160ms ease;
}
.app-button:hover {
  background: rgba(255, 255, 255, 0.09);
  border-color: rgba(255, 255, 255, 0.16);
  color: var(--accent3);
  transform: translateY(-1px);
}

/* Sections + footer */
section { padding-top: 46px; padding-bottom: 8px; }

section h2 {
  margin: 0 0 10px;
  font-size: 1.35rem;
  letter-spacing: -0.02em;
}

section p {
  margin: 0 0 10px;
  color: var(--muted);
  max-width: 800px;
}

footer {
  margin-top: 46px;
  padding-top: 26px;
  padding-bottom: 34px;
  border-top: 1px solid var(--border);
  color: var(--muted2);
  text-align: center;
}
footer p { margin: 0; }

/* Mobile */
@media (max-width: 760px) {
  nav { padding: 12px 16px; }
  nav ul { gap: 14px; }
  header { padding-top: 108px; padding-bottom: 34px; }

  header, section, footer { padding-left: 16px; padding-right: 16px; }
  .features-grid { padding-left: 16px; padding-right: 16px; }
}