/*!
  泡泡AI 下载中心
*/
:root {
  --ink: #0b3a55;
  --soft: #0369a1;
  --glow: #38bdf8;
  --deep: #0284c7;
  --card: rgba(255, 255, 255, 0.78);
  --font: "Nunito", "PingFang SC", "Microsoft YaHei", sans-serif;
  --display: "Fredoka", "Nunito", sans-serif;
}
* { box-sizing: border-box; }
html, body {
  margin: 0; min-height: 100%;
  font-family: var(--font);
  color: var(--ink);
  background: #0369a1;
}
body {
  min-height: 100dvh;
  overflow-x: hidden;
  background:
    radial-gradient(1200px 700px at 10% -10%, #7dd3fc 0%, transparent 55%),
    radial-gradient(900px 600px at 100% 0%, #0ea5e9 0%, transparent 50%),
    linear-gradient(165deg, #7dd3fc, #38bdf8 42%, #0284c7 100%);
}
.orbit {
  position: fixed; inset: 0; pointer-events: none; overflow: hidden; z-index: 0;
}
.bubble {
  position: absolute; border-radius: 50%;
  background: radial-gradient(circle at 30% 28%, rgba(255,255,255,.85), rgba(255,255,255,.12) 42%, rgba(14,165,233,.18));
  border: 1px solid rgba(255,255,255,.35);
  animation: float var(--d, 12s) ease-in-out infinite;
  opacity: .55;
}
@keyframes float {
  0%, 100% { transform: translateY(0) scale(1); }
  50% { transform: translateY(-28px) scale(1.04); }
}
.wrap {
  position: relative; z-index: 1;
  max-width: 920px; margin: 0 auto;
  padding: clamp(1.2rem, 4vw, 2.5rem) 1.1rem 3rem;
}
.topnav {
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: 1.6rem;
}
.topnav a {
  color: #fff; text-decoration: none; font-weight: 800;
  background: rgba(255,255,255,.18); padding: 10px 14px; border-radius: 999px;
  border: 1px solid rgba(255,255,255,.28);
}
.topnav #langBtn {
  color: #fff; font-weight: 800; cursor: pointer;
  background: rgba(2,132,199,.55); padding: 10px 14px; border-radius: 999px;
  border: 1px solid rgba(255,255,255,.45);
  font: inherit;
}
.topnav {
  gap: 0.6rem; flex-wrap: wrap;
}
.hero {
  text-align: center;
  padding: 1.4rem 0 1.8rem;
  animation: rise .7s ease both;
}
@keyframes rise {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: none; }
}
.logo {
  width: 96px; height: 96px; border-radius: 28px;
  box-shadow: 0 18px 40px rgba(2,132,199,.35);
  margin: 0 auto 1rem; display: block;
  background: #fff;
}
.brand {
  margin: 0;
  font-family: var(--display);
  font-size: clamp(2.4rem, 8vw, 3.6rem);
  font-weight: 700;
  color: #fff;
  letter-spacing: .02em;
  text-shadow: 0 8px 30px rgba(2, 80, 130, .35);
}
.tagline {
  margin: .55rem auto 0;
  max-width: 28rem;
  color: rgba(255,255,255,.92);
  font-weight: 700;
  font-size: 1.05rem;
  line-height: 1.5;
}
.cta-row {
  display: flex; flex-wrap: wrap; gap: 12px; justify-content: center;
  margin-top: 1.5rem;
}
.btn {
  appearance: none; border: 0; cursor: pointer; text-decoration: none;
  font: inherit; font-weight: 800;
  border-radius: 999px; padding: 14px 22px;
  display: inline-flex; align-items: center; gap: 8px;
  transition: transform .15s ease, box-shadow .15s ease;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary {
  color: #fff;
  background: linear-gradient(135deg, #0ea5e9, #0369a1);
  box-shadow: 0 12px 28px rgba(2,132,199,.45), 0 0 0 0 rgba(56,189,248,.5);
  animation: pulse 2.4s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { box-shadow: 0 12px 28px rgba(2,132,199,.45), 0 0 0 0 rgba(56,189,248,.35); }
  50% { box-shadow: 0 14px 32px rgba(2,132,199,.5), 0 0 0 10px rgba(56,189,248,0); }
}
.btn-ghost {
  color: #0369a1;
  background: rgba(255,255,255,.88);
  border: 1px solid rgba(255,255,255,.5);
}
.panel {
  margin-top: 1.6rem;
  background: var(--card);
  backdrop-filter: blur(16px);
  border-radius: 24px;
  padding: 1.25rem 1.2rem 1.4rem;
  box-shadow: 0 18px 50px rgba(14,116,144,.2);
  animation: rise .85s .08s ease both;
}
.panel h2 {
  margin: 0 0 .35rem;
  font-family: var(--display);
  font-size: 1.35rem;
}
.panel p {
  margin: 0 0 1rem;
  color: var(--soft);
  font-weight: 700;
  line-height: 1.5;
}
.steps {
  display: grid; gap: 10px;
  margin: 0; padding: 0; list-style: none;
}
.steps li {
  display: grid; grid-template-columns: 34px 1fr; gap: 10px; align-items: start;
  font-weight: 700; line-height: 1.45;
}
.steps b {
  width: 34px; height: 34px; border-radius: 12px;
  display: grid; place-items: center;
  color: #fff; background: linear-gradient(135deg, #38bdf8, #0284c7);
  font-size: .9rem;
}
.meta {
  margin-top: 1rem;
  font-size: .85rem;
  color: var(--soft);
  font-weight: 700;
}
.note {
  margin-top: 1.2rem;
  text-align: center;
  color: rgba(255,255,255,.88);
  font-weight: 700;
  font-size: .9rem;
}
.note a { color: #fff; }
@media (max-width: 560px) {
  .logo { width: 78px; height: 78px; border-radius: 22px; }
}

/* 泡泡AI 2.0 · 炫酷科技版（与主站同一套开关） */
html[data-theme="neo"] {
  --ink: #eef2ff;
  --soft: #b4c0ff;
  --glow: #8b5cf6;
  --deep: #2563eb;
  --card: rgba(16, 14, 36, 0.55);
  --font: "Outfit", "PingFang SC", "Microsoft YaHei", sans-serif;
  --display: "Syne", "Outfit", sans-serif;
}
html[data-theme="neo"], html[data-theme="neo"] body { background: #05040f; color: var(--ink); }
html[data-theme="neo"] body {
  background:
    radial-gradient(1200px 700px at 10% -10%, rgba(91, 33, 182, 0.5), transparent 55%),
    radial-gradient(900px 600px at 100% 0%, rgba(37, 99, 235, 0.45), transparent 50%),
    linear-gradient(165deg, #0b0718, #070614 42%, #05040f 100%);
}
html[data-theme="neo"] .bubble {
  background: radial-gradient(circle at 30% 28%, rgba(255,255,255,.35), rgba(139,92,246,.18) 42%, rgba(37,99,235,.12));
}
html[data-theme="neo"] .topnav a,
html[data-theme="neo"] .topnav #langBtn {
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(255,255,255,.22);
  backdrop-filter: blur(18px) saturate(1.6);
}
html[data-theme="neo"] .logo {
  background: rgba(255,255,255,.08);
  box-shadow: 0 18px 40px rgba(79,70,229,.4);
}
html[data-theme="neo"] .brand {
  background: linear-gradient(90deg, #fff, #c4b5fd 40%, #93c5fd);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
html[data-theme="neo"] .panel {
  background: linear-gradient(165deg, rgba(255,255,255,.14), rgba(255,255,255,.06));
  backdrop-filter: blur(28px) saturate(1.8);
  border: 1px solid rgba(255,255,255,.2);
  box-shadow: inset 0 1px 0 rgba(255,255,255,.28), 0 18px 48px rgba(0,0,0,.38);
  color: var(--ink);
}
html[data-theme="neo"] .btn-primary {
  background: linear-gradient(135deg, #8b5cf6, #2563eb);
}
html[data-theme="neo"] .btn-ghost {
  background: rgba(255,255,255,.08);
  color: #e0e7ff;
  border: 1px solid rgba(255,255,255,.22);
}

html.is-phone,
html.is-phone body {
  overflow-x: hidden;
  max-width: 100%;
}
html.is-phone .wrap {
  padding: 0.85rem 0.85rem 1.6rem;
  max-width: 100%;
}
html.is-phone .topnav a,
html.is-phone .topnav #langBtn {
  padding: 7px 10px;
  font-size: 0.78rem;
}
html.is-phone .hero { padding: 0.6rem 0 1rem; }
html.is-phone .logo { width: 64px; height: 64px; border-radius: 18px; margin-bottom: 0.6rem; }
html.is-phone .brand { font-size: 1.45rem; }
html.is-phone .tagline { font-size: 0.86rem; }
html.is-phone .cta-row { gap: 8px; }
html.is-phone .btn { padding: 9px 12px; font-size: 0.82rem; }
html.is-phone .panel { padding: 14px 14px 16px; margin-bottom: 12px; }
html.is-phone .panel h2 { font-size: 1.05rem; }
html.is-phone .panel p,
html.is-phone .steps { font-size: 0.82rem; }
html.is-phone .orbit .bubble { animation-duration: 18s !important; opacity: 0.28; }