@import url('https://fonts.googleapis.com/css2?family=Nunito:wght@500;700;900&display=swap');

:root {
  color-scheme: dark;
  --bg: #0c0a18;
  --panel: rgba(30, 25, 60, .72);
  --panel-2: #2a2352;
  --text: #f4f2ff;
  --muted: #b9b3d4;
  --purple: #8b5cf6;
  --violet: #6d28d9;
  --blue: #3b82f6;
  --cyan: #22d3ee;
  --green: #22c55e;
  --orange: #f97316;
  --pink: #ec4899;
  --teal: #14b8a6;
  --glow: 0 10px 40px rgba(139, 92, 246, .25);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font: 17px/1.6 "Nunito", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color: var(--text);
  background:
    radial-gradient(900px 600px at 10% -10%, rgba(139, 92, 246, .35), transparent 60%),
    radial-gradient(700px 500px at 100% 10%, rgba(34, 211, 238, .18), transparent 60%),
    radial-gradient(800px 600px at 50% 110%, rgba(236, 72, 153, .18), transparent 60%),
    var(--bg);
  background-attachment: fixed;
}
main { max-width: 780px; margin: 0 auto; padding: 12px 16px 72px; }
header.top { max-width: 780px; margin: 0 auto; padding: 16px 16px 0; }
header.top a.brand {
  display: inline-flex; align-items: center; gap: 10px;
  color: #fff; text-decoration: none; font-weight: 900; font-size: 1.15rem; letter-spacing: .2px;
}
header.top a.brand::before {
  content: "LM"; display: inline-flex; align-items: center; justify-content: center;
  width: 34px; height: 34px; border-radius: 10px; font-size: 13px; font-weight: 900;
  background: linear-gradient(135deg, var(--purple), var(--cyan)); color: #fff; box-shadow: var(--glow);
}
nav.menu { display: flex; flex-wrap: wrap; gap: 8px; margin: 14px 0 4px; }
nav.menu a {
  background: rgba(255, 255, 255, .07); color: #e9e4ff; padding: 9px 14px; border-radius: 999px;
  text-decoration: none; font-size: 14px; font-weight: 700; backdrop-filter: blur(8px);
  transition: transform .15s ease, background .15s ease;
}
nav.menu a:hover { transform: translateY(-1px); background: rgba(255, 255, 255, .14); }
nav.menu a.current { background: linear-gradient(135deg, var(--purple), var(--violet)); color: #fff; box-shadow: var(--glow); }

h1 { font-size: clamp(1.9rem, 6vw, 2.6rem); margin: 10px 0 8px; line-height: 1.12; font-weight: 900; letter-spacing: -.3px; }
h1 .grad, .grad {
  background: linear-gradient(90deg, #c4b5fd, #67e8f9 55%, #f9a8d4); -webkit-background-clip: text; background-clip: text; color: transparent;
}
h2 { font-size: 1.35rem; margin: 0 0 10px; font-weight: 900; }
h3 { font-size: 1.1rem; margin: 18px 0 6px; font-weight: 900; }
p { margin: 8px 0; }
.sub { color: var(--muted); margin: 0 0 20px; font-size: 1.05rem; }
section {
  background: var(--panel); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  border-radius: 18px; padding: 20px 18px; margin: 0 0 18px; box-shadow: 0 10px 30px rgba(0, 0, 0, .35);
}
ol, ul { padding-left: 22px; margin: 8px 0; }
li { margin: 6px 0; }
a { color: #c4b5fd; }
.btn {
  display: inline-block; padding: 12px 20px; border-radius: 12px; color: #fff; font-weight: 900; text-decoration: none;
  border: 0; font-size: 16px; cursor: pointer; font-family: inherit;
  background: linear-gradient(135deg, var(--purple), var(--violet)); box-shadow: var(--glow);
  transition: transform .15s ease, filter .15s ease;
}
.btn:hover { transform: translateY(-2px); filter: brightness(1.08); }
.btn.secondary { background: linear-gradient(135deg, var(--blue), #1d4ed8); }
.btn.play { background: linear-gradient(135deg, var(--orange), #dc2626); box-shadow: 0 10px 40px rgba(249, 115, 22, .3); }
.btn.help { background: linear-gradient(135deg, var(--teal), #0e7490); box-shadow: 0 10px 40px rgba(20, 184, 166, .3); }
.btn.big { display: block; text-align: center; padding: 18px; font-size: 19px; margin: 12px 0; }
.drag { cursor: grab; }
code, textarea, pre { font-family: ui-monospace, Menlo, Consolas, monospace; font-size: 13px; }
code { background: rgba(0, 0, 0, .45); padding: 2px 6px; border-radius: 6px; color: #e9e4ff; }
textarea { width: 100%; min-height: 84px; margin-top: 8px; background: rgba(0, 0, 0, .45); color: #dcd8f0; border: 0; border-radius: 10px; padding: 10px; }
.ok { color: #86efac; font-weight: 700; }
.warn { color: #fde68a; font-weight: 700; }
.hint { color: var(--muted); font-size: 14.5px; }
details summary { cursor: pointer; font-weight: 700; }
.tag { display: inline-block; font-size: 12px; font-weight: 900; padding: 3px 10px; border-radius: 999px; background: rgba(255, 255, 255, .1); color: #e9e4ff; vertical-align: middle; margin-left: 6px; }

/* hero (home) */
.hero { display: grid; grid-template-columns: 1.2fr .8fr; gap: 18px; align-items: center; margin: 6px 0 20px; }
.hero img { width: 100%; max-width: 300px; margin: 0 auto; display: block; border-radius: 22px; box-shadow: 0 25px 60px rgba(0, 0, 0, .55), var(--glow); }
@media (max-width: 640px) { .hero { grid-template-columns: 1fr; } .hero img { max-width: 240px; } }

/* the big reminder */
.remember {
  display: flex; gap: 14px; align-items: center; margin: 14px 0 18px; padding: 16px 18px; border-radius: 16px; color: #fff;
  background: linear-gradient(135deg, #f97316, #ec4899); box-shadow: 0 12px 40px rgba(236, 72, 153, .35);
  font-weight: 700; font-size: 1.05rem;
}
.remember b { font-weight: 900; }

/* step-by-step blocks */
.step { display: grid; grid-template-columns: 46px 1fr; gap: 14px; padding: 16px 0; border-top: 1px solid rgba(255, 255, 255, .08); }
.step:first-of-type { border-top: 0; }
.step .num { width: 38px; height: 38px; border-radius: 50%; color: #fff; font-weight: 900; display: flex; align-items: center; justify-content: center; background: linear-gradient(135deg, var(--purple), var(--violet)); box-shadow: 0 6px 18px rgba(139, 92, 246, .45); }
.step:nth-of-type(2) .num { background: linear-gradient(135deg, var(--blue), #1d4ed8); box-shadow: 0 6px 18px rgba(59, 130, 246, .45); }
.step:nth-of-type(3) .num { background: linear-gradient(135deg, var(--green), #15803d); box-shadow: 0 6px 18px rgba(34, 197, 94, .45); }
.step:nth-of-type(4) .num { background: linear-gradient(135deg, var(--orange), #c2410c); box-shadow: 0 6px 18px rgba(249, 115, 22, .45); }
.step:nth-of-type(5) .num { background: linear-gradient(135deg, var(--pink), #be185d); box-shadow: 0 6px 18px rgba(236, 72, 153, .45); }
.step h3 { margin: 6px 0 4px; }
.step p { margin: 4px 0; }
.step figure { margin: 10px 0 0; }
figure img { display: block; max-width: 100%; height: auto; border-radius: 14px; background: #0f0d1c; box-shadow: 0 12px 30px rgba(0, 0, 0, .5); }
figure.phone img { max-width: 280px; }
figure.wide img { width: 100%; }
figcaption { color: var(--muted); font-size: 13.5px; margin-top: 8px; }
.row { display: flex; flex-wrap: wrap; gap: 16px; align-items: flex-start; }
.row figure { flex: 1 1 240px; margin: 10px 0 0; }
.placeholder { max-width: 280px; min-height: 120px; border-radius: 14px; padding: 14px; color: #fff; font-size: 14px; background: linear-gradient(135deg, #3b3170, #2a2550); }
.placeholder b { color: #fde68a; }

/* device cards */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 14px; }
.card { display: block; border-radius: 18px; padding: 22px 18px; text-decoration: none; color: #fff; background: linear-gradient(135deg, var(--purple), var(--violet)); box-shadow: 0 14px 40px rgba(0, 0, 0, .4); transition: transform .15s ease; }
.card.android { background: linear-gradient(135deg, #22c55e, #0f766e); }
.card.iphone { background: linear-gradient(135deg, #3b82f6, #4f46e5); }
.card:hover { transform: translateY(-2px); }
.card b { display: block; font-size: 1.2rem; margin-bottom: 4px; font-weight: 900; }
.card span { color: rgba(255, 255, 255, .88); font-size: 14.5px; }
.next { margin-top: 18px; }
footer { color: var(--muted); font-size: 14px; text-align: center; margin-top: 28px; }