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

:root {
  --bg: #08111f;
  --bg-card: rgba(255, 255, 255, 0.04);
  --bg-card-hover: rgba(255, 255, 255, 0.06);
  --text: #f8fafc;
  --text-secondary: #b6c4d4;
  --accent: #1f8fff;
  --accent-soft: rgba(31, 143, 255, 0.14);
  --border: rgba(255, 255, 255, 0.08);
  --green: #34c789;
  --shadow: 0 30px 80px rgba(0, 0, 0, 0.32);
  --radius: 18px;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top, rgba(31, 143, 255, 0.2), transparent 34%),
    linear-gradient(180deg, #0a1627 0%, #08111f 38%, #09131e 100%);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--accent);
  text-decoration: none;
}

.container {
  width: min(1080px, calc(100% - 40px));
  margin: 0 auto;
}

.hero {
  padding: 96px 0 80px;
  text-align: center;
}

.hero-icon {
  width: 124px;
  height: 124px;
  border-radius: 28px;
  box-shadow: var(--shadow);
  margin-bottom: 28px;
}

.eyebrow {
  margin: 0 0 14px;
  color: #91d7ff;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  font-size: 0.78rem;
  font-weight: 700;
}

.hero h1 {
  margin: 0 auto 16px;
  max-width: 760px;
  font-size: clamp(2.8rem, 7vw, 4.5rem);
  line-height: 1.02;
  letter-spacing: -0.05em;
}

.tagline {
  max-width: 700px;
  margin: 0 auto 34px;
  color: var(--text-secondary);
  font-size: 1.16rem;
}

.kbd {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--accent-soft);
  border: 1px solid rgba(125, 195, 255, 0.25);
  color: #dff4ff;
  font-weight: 600;
}

.btn-download {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 240px;
  padding: 15px 30px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--accent) 0%, #15b8ff 100%);
  color: white;
  font-weight: 700;
  font-size: 1rem;
  box-shadow: 0 18px 50px rgba(31, 143, 255, 0.28);
  transition: transform 0.16s ease, box-shadow 0.16s ease;
}

.btn-download:hover {
  color: white;
  transform: translateY(-2px);
  box-shadow: 0 24px 56px rgba(31, 143, 255, 0.36);
}

.btn-download.is-disabled,
.btn-download[aria-disabled="true"] {
  opacity: 0.7;
  pointer-events: none;
  transform: none;
  box-shadow: none;
  background: linear-gradient(135deg, rgba(31, 143, 255, 0.55) 0%, rgba(21, 184, 255, 0.55) 100%);
}

.hero-meta {
  margin: 16px 0 0;
  color: var(--text-secondary);
  font-size: 0.92rem;
}

.download-status {
  max-width: 660px;
  margin: 18px auto 0;
  color: #91d7ff;
  font-size: 0.94rem;
}

section {
  padding: 76px 0;
}

.section-title {
  margin: 0 0 12px;
  font-size: clamp(1.9rem, 4vw, 2.8rem);
  line-height: 1.08;
  letter-spacing: -0.04em;
  text-align: center;
}

.section-title.left {
  text-align: left;
}

.section-subtitle {
  max-width: 620px;
  margin: 0 auto 42px;
  color: var(--text-secondary);
  text-align: center;
  font-size: 1.04rem;
}

.features-grid,
.steps,
.trust-grid {
  display: grid;
  gap: 18px;
}

.features-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.steps {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.trust-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.feature-card,
.step,
.trust-grid > div {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  backdrop-filter: blur(16px);
  box-shadow: 0 20px 48px rgba(0, 0, 0, 0.18);
}

.feature-card {
  padding: 26px 24px;
  transition: background 0.18s ease, transform 0.18s ease;
}

.feature-card:hover {
  background: var(--bg-card-hover);
  transform: translateY(-2px);
}

.feature-card h3,
.step h3 {
  margin: 0 0 8px;
  font-size: 1.1rem;
  letter-spacing: -0.02em;
}

.feature-card p,
.step p,
.download-cta p {
  margin: 0;
  color: var(--text-secondary);
}

.step,
.trust-grid > div {
  padding: 28px 24px;
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  margin-bottom: 18px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent) 0%, #15b8ff 100%);
  color: white;
  font-size: 0.95rem;
  font-weight: 800;
}

.check-list {
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.check-list li {
  position: relative;
  padding-left: 28px;
  margin-bottom: 14px;
  color: var(--text-secondary);
}

.check-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 6px rgba(52, 199, 137, 0.12);
}

.download-cta {
  text-align: center;
  padding-top: 84px;
  padding-bottom: 96px;
}

.download-cta p {
  max-width: 620px;
  margin: 0 auto 30px;
  font-size: 1.05rem;
}

footer {
  border-top: 1px solid var(--border);
  padding: 24px 0 40px;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
}

.footer-links {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}

footer p {
  margin: 0;
  color: var(--text-secondary);
}

@media (max-width: 900px) {
  .features-grid,
  .steps,
  .trust-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 72px;
  }
}

@media (max-width: 640px) {
  .container {
    width: min(100% - 28px, 1080px);
  }

  .hero-icon {
    width: 104px;
    height: 104px;
    border-radius: 24px;
  }

  .btn-download {
    width: 100%;
  }

  .footer-content {
    flex-direction: column;
    align-items: flex-start;
  }
}