*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --navy:      #0A1628;
  --navy-dk:   #060D18;
  --navy-lt:   #12233D;
  --accent:    #38BDF8;
  --accent-dk: #0EA5E9;
  --white:     #FFFFFF;
  --gray100:   #E7ECF3;
  --gray300:   #A7B3C6;
  --gray500:   #7C8AA3;
  --radius:    18px;
}

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--navy-dk);
  color: var(--white);
  line-height: 1.55;
}

a { color: inherit; text-decoration: none; }
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 24px; }

/* Nav */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(10, 22, 40, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.nav .wrap { display: flex; align-items: center; justify-content: space-between; height: 68px; }
.nav-brand { display: flex; align-items: center; gap: 12px; }
.nav-brand img { height: 30px; }
.nav-brand span { font-weight: 800; font-size: 13px; letter-spacing: 1.5px; color: var(--gray300); text-transform: uppercase; }
.nav-back { font-size: 13.5px; font-weight: 600; color: var(--gray300); display: flex; align-items: center; gap: 6px; }
.nav-back:hover { color: var(--white); }

/* Hero / page header */
.hero {
  background: radial-gradient(circle at 20% -10%, rgba(56,189,248,0.16), transparent 55%), var(--navy);
  padding: 64px 0 48px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(56,189,248,0.12); border: 1px solid rgba(56,189,248,0.3);
  color: var(--accent); font-size: 12px; font-weight: 700; letter-spacing: 0.5px;
  padding: 6px 14px; border-radius: 20px; margin-bottom: 22px; text-transform: uppercase;
}
h1 { font-size: 34px; font-weight: 800; letter-spacing: -0.8px; line-height: 1.2; margin-bottom: 14px; }
.lead { font-size: 15.5px; color: var(--gray300); max-width: 620px; }

/* App grid (catalogue) */
.section { padding: 48px 0; }
.section-title { font-size: 22px; font-weight: 800; margin-bottom: 28px; }
.app-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 20px; }

.app-card {
  background: var(--navy-lt); border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius); padding: 24px;
  display: flex; flex-direction: column; gap: 14px;
  transition: transform .15s, border-color .15s;
}
.app-card:hover { transform: translateY(-3px); border-color: rgba(56,189,248,0.4); }
.app-card-top { display: flex; align-items: center; gap: 14px; }
.app-icon { width: 56px; height: 56px; border-radius: 14px; object-fit: cover; flex-shrink: 0; box-shadow: 0 6px 16px rgba(0,0,0,0.35); }
.app-card-top h3 { font-size: 16px; font-weight: 800; }
.app-card-top span { font-size: 12.5px; color: var(--gray500); }
.app-card p.tagline { font-size: 13.5px; color: var(--gray300); flex: 1; }
.app-card-meta { display: flex; align-items: center; justify-content: space-between; font-size: 12px; color: var(--gray500); }
.badge-android { display: inline-flex; align-items: center; gap: 5px; color: var(--gray300); }
.btn-open {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  background: rgba(56,189,248,0.12); color: var(--accent); border: 1px solid rgba(56,189,248,0.35);
  font-size: 13.5px; font-weight: 700; padding: 10px 16px; border-radius: 12px;
  transition: background .15s;
}
.btn-open:hover { background: rgba(56,189,248,0.22); }

/* Stats row (detail page) */
.stats { display: flex; gap: 28px; margin: 22px 0 30px; flex-wrap: wrap; }
.stat strong { display: block; font-size: 20px; font-weight: 800; }
.stat span { font-size: 12px; color: var(--gray500); }

/* Buttons */
.btn-primary {
  display: inline-flex; align-items: center; gap: 10px;
  color: var(--navy-dk); font-size: 15.5px; font-weight: 800;
  padding: 15px 28px; border: none; border-radius: 14px;
  cursor: pointer;
  box-shadow: 0 16px 32px rgba(56,189,248,0.22);
  transition: transform .15s, filter .15s;
}
.btn-primary:hover { transform: translateY(-1px); filter: brightness(1.05); }
.btn-primary svg { width: 20px; height: 20px; flex-shrink: 0; }
.btn-disabled {
  display: inline-flex; align-items: center; gap: 10px;
  background: rgba(255,255,255,0.06); color: var(--gray500);
  font-size: 15.5px; font-weight: 700; padding: 15px 28px; border-radius: 14px;
  border: 1px dashed rgba(255,255,255,0.18); cursor: not-allowed;
}
.note { margin-top: 14px; font-size: 12.5px; color: var(--gray500); }

/* Steps */
.steps { display: flex; flex-direction: column; gap: 16px; max-width: 640px; }
.step { display: flex; gap: 14px; align-items: flex-start; }
.step-num {
  width: 28px; height: 28px; border-radius: 50%; background: rgba(56,189,248,0.14); color: var(--accent);
  display: flex; align-items: center; justify-content: center; font-weight: 800; font-size: 13px; flex-shrink: 0;
}
.step p { font-size: 14px; color: var(--gray300); }
.step strong { color: var(--white); }

/* Changelog */
.changelog-box {
  max-width: 640px; background: var(--navy-lt); border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius); padding: 24px 28px;
}
.changelog-box ul { padding-left: 18px; }
.changelog-box li { font-size: 13.5px; color: var(--gray300); margin-bottom: 8px; }

/* Footer */
footer {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding: 32px 0; text-align: center; font-size: 12.5px; color: var(--gray500);
}
footer a { color: var(--gray300); font-weight: 600; }
footer a:hover { color: var(--accent); }

@media (max-width: 560px) {
  h1 { font-size: 27px; }
  .hero { padding: 48px 0 36px; }
  .btn-primary, .btn-disabled { width: 100%; justify-content: center; }
}