:root {
  --bg: #0a0d13;
  --panel: #111722;
  --panel-2: #151c29;
  --line: #222b3a;
  --text: #eef3f8;
  --muted: #aeb7c2;
  --dim: #7b8594;
  --slate: #8793a2;
  --accent: #e75480;
  --accent-2: #ff8fb1;
  --radius: 20px;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.55 Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  overflow-x: hidden;
}
code { font: 0.88em ui-monospace, SFMono-Regular, Menlo, monospace; color: var(--text); background: #1a2231; padding: 1px 5px; border-radius: 5px; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* ---------- background ---------- */
.bg { position: fixed; inset: 0; z-index: 0; pointer-events: none; overflow: hidden; }
.glow {
  position: absolute; inset: -20%;
  background:
    radial-gradient(40% 35% at 70% 20%, rgba(231, 84, 128, 0.10), transparent 70%),
    radial-gradient(45% 40% at 20% 80%, rgba(135, 147, 162, 0.10), transparent 70%);
}
.bg::after { /* faint dot grid */
  content: ""; position: absolute; inset: 0;
  background-image: radial-gradient(rgba(255,255,255,0.05) 1px, transparent 1px);
  background-size: 26px 26px;
  mask-image: radial-gradient(70% 60% at 50% 45%, #000, transparent);
}
.tail {
  position: absolute;
  right: -4vw; bottom: -6vh;
  height: 115vh; width: auto;
  opacity: 0.07;
  filter: blur(0.6px);
}
.tail line { stroke: var(--muted); stroke-linecap: round; }
.tail .tip { fill: var(--muted); }
.seg {
  transform-origin: 0 0;
  animation: wag 3.6s ease-in-out infinite alternate;
  animation-delay: calc(var(--i) * -0.28s);
}
@keyframes wag {
  from { transform: rotate(calc(var(--b) - 7deg)); }
  to   { transform: rotate(calc(var(--b) + 7deg)); }
}

/* ---------- header ---------- */
.site-header { position: relative; z-index: 1; padding: 22px 28px; }
.brand { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; }
.brand-mark { width: 40px; height: 40px; transition: transform 0.4s cubic-bezier(.3,1.6,.5,1); }
.brand:hover .brand-mark { transform: rotate(-8deg) scale(1.06); }
.wordmark { font-weight: 800; font-size: 22px; letter-spacing: -0.04em; }
.w1 { color: var(--text); }
.w2 { color: var(--muted); transition: color 0.3s; }
.brand:hover .w2 { color: var(--accent-2); }

/* ---------- cards ---------- */
main { position: relative; z-index: 1; flex: 1; display: flex; align-items: center; justify-content: center; padding: 24px 16px 56px; }
.cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 360px));
  gap: 28px;
  align-items: start;
}
.card {
  --mx: 50%; --my: 0%;
  position: relative;
  padding: 30px 28px 22px;
  border-radius: var(--radius);
  background:
    radial-gradient(420px circle at var(--mx) var(--my), rgba(231, 84, 128, 0.09), transparent 45%),
    linear-gradient(180deg, var(--panel-2), var(--panel));
  border: 1px solid var(--line);
  box-shadow: 0 20px 60px -30px rgba(0,0,0,0.8);
  text-align: center;
  transition: transform 0.35s ease, border-color 0.35s ease, box-shadow 0.35s ease;
  animation: rise 0.7s cubic-bezier(.2,.8,.2,1) both;
}
.card:nth-child(2) { animation-delay: 0.08s; }
.card::before { /* gradient border that follows the cursor */
  content: ""; position: absolute; inset: -1px; border-radius: inherit; padding: 1px;
  background: radial-gradient(260px circle at var(--mx) var(--my), rgba(255, 143, 177, 0.7), transparent 60%);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor; mask-composite: exclude;
  opacity: 0; transition: opacity 0.35s ease; pointer-events: none;
}
.card:hover { transform: translateY(-4px); box-shadow: 0 30px 70px -30px rgba(231, 84, 128, 0.35); }
.card:hover::before { opacity: 1; }
@keyframes rise { from { opacity: 0; transform: translateY(14px); } }

.card-icon {
  width: 52px; height: 52px; margin: 0 auto 14px;
  display: grid; place-items: center;
  border-radius: 14px;
  background: #1a2231; border: 1px solid var(--line);
  transition: transform 0.4s cubic-bezier(.3,1.6,.5,1), background 0.3s;
}
.card-icon svg { width: 26px; height: 26px; fill: var(--muted); stroke: var(--muted); transition: fill .3s, stroke .3s; }
.card:hover .card-icon { transform: translateY(-2px) rotate(-6deg); background: rgba(231, 84, 128, 0.12); }
.card:hover .card-icon svg { fill: var(--accent-2); stroke: var(--accent-2); }

.card h2 { margin: 0; font-size: 21px; font-weight: 800; letter-spacing: -0.03em; }
.card-sub { margin: 2px 0 10px; font-size: 12px; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; color: var(--dim); }
.card-desc { margin: 0 auto 22px; max-width: 290px; font-size: 14px; color: var(--muted); }

/* ---------- buttons ---------- */
.btn {
  position: relative; overflow: hidden;
  display: inline-flex; align-items: center; justify-content: center; gap: 9px;
  width: 100%;
  padding: 14px 20px;
  border-radius: 14px;
  font-weight: 600; font-size: 15px; color: #fff; text-decoration: none;
  background: linear-gradient(135deg, #f06292 0%, var(--accent) 50%, #c23a66 100%);
  box-shadow: 0 8px 24px -8px rgba(231, 84, 128, 0.6), inset 0 1px 0 rgba(255,255,255,0.25);
  transition: transform 0.2s ease, box-shadow 0.25s ease, filter 0.25s ease;
}
.btn svg { width: 19px; height: 19px; transition: transform 0.3s ease; }
.btn:hover { transform: translateY(-2px); filter: brightness(1.08); box-shadow: 0 14px 34px -10px rgba(231, 84, 128, 0.8), inset 0 1px 0 rgba(255,255,255,0.3); }
.btn:hover svg { transform: translateY(2px); }
.btn:active { transform: translateY(0); }
.btn:focus-visible { outline: 2px solid var(--accent-2); outline-offset: 3px; }
.btn-shine {
  position: absolute; top: 0; left: -60%; width: 40%; height: 100%;
  background: linear-gradient(100deg, transparent, rgba(255,255,255,0.35), transparent);
  transform: skewX(-20deg);
}
.btn:hover .btn-shine { animation: shine 0.8s ease; }
@keyframes shine { to { left: 130%; } }

.meta { margin: 10px 0 0; font-size: 12px; color: var(--dim); }

/* ---------- install guide ---------- */
.guide { margin-top: 16px; border-top: 1px solid var(--line); padding-top: 12px; text-align: left; }
.guide summary {
  cursor: pointer; list-style: none;
  font-size: 13px; font-weight: 600; color: var(--muted);
  display: flex; align-items: center; justify-content: center; gap: 6px;
  transition: color 0.2s;
}
.guide summary::-webkit-details-marker { display: none; }
.guide summary::after { content: ""; width: 7px; height: 7px; border: solid currentColor; border-width: 0 1.5px 1.5px 0; transform: rotate(45deg) translateY(-2px); transition: transform 0.25s; }
.guide[open] summary::after { transform: rotate(-135deg) translateY(-2px); }
.guide summary:hover { color: var(--accent-2); }
.hint { font-weight: 400; color: var(--dim); }
.guide-body { padding-top: 12px; font-size: 13.5px; color: var(--muted); animation: rise 0.35s ease both; }
.note { margin: 0 0 12px; padding: 10px 12px; border-radius: 10px; background: rgba(231, 84, 128, 0.07); border: 1px solid rgba(231, 84, 128, 0.2); }
.steps { margin: 0 0 14px; padding: 0; list-style: none; counter-reset: s; }
.steps li { position: relative; padding: 0 0 12px 34px; counter-increment: s; }
.steps li::before {
  content: counter(s);
  position: absolute; left: 0; top: 0;
  width: 22px; height: 22px; border-radius: 50%;
  display: grid; place-items: center;
  font-size: 11px; font-weight: 700; color: var(--text);
  background: #1f2838; border: 1px solid var(--line);
}
.steps strong, .expect strong, .note strong { color: var(--text); }
.small { font-size: 12px; color: var(--dim); }
.copy {
  margin-left: 4px; padding: 2px 8px;
  font: 600 11px Inter, system-ui, sans-serif; color: var(--text);
  background: #1f2838; border: 1px solid var(--line); border-radius: 6px; cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
}
.copy:hover { border-color: var(--accent); background: rgba(231, 84, 128, 0.12); }
.expect h3 { margin: 4px 0 6px; font-size: 13px; color: var(--text); }
.expect ul { margin: 0 0 12px; padding-left: 18px; }
.expect li { margin-bottom: 7px; }
.hash { margin: 0; font-size: 11px; color: var(--dim); word-break: break-all; }
.hash code { font-size: 10.5px; background: none; padding: 0; color: var(--dim); }

/* ---------- footer ---------- */
.site-footer { position: relative; z-index: 1; padding: 20px 16px 26px; text-align: center; font-size: 12px; color: var(--dim); }
.site-footer p { margin: 0; }

/* ---------- responsive / motion ---------- */
@media (max-width: 780px) {
  .cards { grid-template-columns: minmax(0, 420px); gap: 20px; }
  .site-header { padding: 18px 16px; }
  main { padding-top: 8px; }
  .tail { right: -30vw; height: 90vh; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .seg { transform: rotate(var(--b)); }
}