:root {
  --bg: #05060a;
  --bg-2: #0a0c16;
  --panel: rgba(255, 255, 255, 0.04);
  --panel-border: rgba(255, 255, 255, 0.08);
  --text: #e6e9f2;
  --muted: #9aa3b8;
  --cyan: #22d3ee;
  --blue: #3b82f6;
  --purple: #a855f7;
  --red: #f43f5e;
  --grad: linear-gradient(120deg, #22d3ee, #3b82f6 45%, #a855f7);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(rgba(34, 211, 238, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(34, 211, 238, 0.05) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background: radial-gradient(ellipse 60% 40% at 50% 0%, rgba(59, 130, 246, 0.14), transparent 60%),
              radial-gradient(ellipse 50% 40% at 80% 90%, rgba(168, 85, 247, 0.12), transparent 60%);
  pointer-events: none;
}

.container { width: min(1120px, 92%); margin: 0 auto; }

.grad {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

/* Header */
.header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(5, 6, 10, 0.82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--panel-border);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo { display: flex; align-items: center; gap: 8px; text-decoration: none; font-size: 20px; font-weight: 700; }
.logo-mark {
  color: var(--text);
  background: var(--panel);
  border: 1px solid var(--panel-border);
  padding: 2px 10px;
  border-radius: 8px;
}
.logo-text { font-weight: 700; }
.nav { display: flex; align-items: center; gap: 22px; }
.nav a { color: var(--muted); text-decoration: none; font-size: 15px; transition: color .2s; }
.nav a:hover { color: var(--cyan); }
.nav-refund { color: #fda4af !important; border: 1px solid rgba(244, 63, 94, 0.4); padding: 4px 12px; border-radius: 8px; }
.nav-refund:hover { color: var(--red) !important; border-color: var(--red); }
.nav-toggle { display: none; background: none; border: 1px solid var(--panel-border); color: var(--text); font-size: 20px; border-radius: 8px; padding: 4px 12px; cursor: pointer; }

/* Hero */
.hero { padding: 84px 0 64px; text-align: center; }
.hero-badge {
  display: inline-block;
  font-size: 13px;
  color: var(--cyan);
  border: 1px solid rgba(34, 211, 238, 0.35);
  background: rgba(34, 211, 238, 0.08);
  padding: 5px 16px;
  border-radius: 999px;
  margin-bottom: 22px;
}
.hero-title { font-size: clamp(40px, 8vw, 68px); font-weight: 800; letter-spacing: 1px; }
.hero-sub { font-size: clamp(18px, 3.5vw, 26px); color: var(--text); margin-top: 12px; font-weight: 600; }
.hero-desc { color: var(--muted); max-width: 620px; margin: 16px auto 0; font-size: 16px; }
.hero-actions { margin-top: 32px; display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.hero-stats { margin-top: 48px; display: flex; gap: 40px; justify-content: center; flex-wrap: wrap; }
.stat { text-align: center; }
.stat-num { display: block; font-size: 26px; font-weight: 700; }
.stat-label { display: block; color: var(--muted); font-size: 13px; margin-top: 2px; }

/* Buttons */
.btn {
  display: inline-block;
  text-decoration: none;
  padding: 13px 30px;
  border-radius: 12px;
  font-size: 16px;
  font-weight: 600;
  transition: transform .15s, box-shadow .2s, background .2s;
  cursor: pointer;
  border: 1px solid transparent;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary {
  background: var(--grad);
  color: #fff;
  box-shadow: 0 0 24px rgba(59, 130, 246, 0.45);
}
.btn-primary:hover { box-shadow: 0 0 36px rgba(34, 211, 238, 0.6); }
.btn-ghost {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  color: var(--text);
}
.btn-ghost:hover { border-color: var(--cyan); color: var(--cyan); }
.btn-refund {
  background: linear-gradient(120deg, #f43f5e, #fb7185);
  color: #fff;
  box-shadow: 0 0 24px rgba(244, 63, 94, 0.4);
}

/* Sections */
.section { padding: 72px 0; }
.section-alt { background: rgba(10, 12, 22, 0.6); }
.section-title { font-size: clamp(28px, 5vw, 38px); font-weight: 700; text-align: center; }
.section-desc { color: var(--muted); text-align: center; max-width: 640px; margin: 14px auto 0; }

/* Features */
.feature-grid { margin-top: 44px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.feature-card {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 16px;
  padding: 28px 24px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: border-color .2s, transform .2s;
}
.feature-card:hover { border-color: rgba(34, 211, 238, 0.5); transform: translateY(-3px); }
.feature-icon {
  width: 48px; height: 48px; border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  font-size: 24px; color: #fff;
  background: var(--grad);
  margin-bottom: 16px;
  box-shadow: 0 0 18px rgba(59, 130, 246, 0.4);
}
.feature-card h3 { font-size: 19px; margin-bottom: 8px; }
.feature-card p { color: var(--muted); font-size: 14px; }

/* Devices */
.device-grid { margin-top: 44px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.device-card {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 16px;
  padding: 32px 24px;
  text-align: center;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}
.device-card h3 { font-size: 22px; margin-bottom: 10px; }
.device-card p { color: var(--muted); font-size: 14px; margin-bottom: 22px; }

/* Gallery */
.image-gallery { margin-top: 44px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.image-gallery img {
  width: 100%;
  aspect-ratio: 1280 / 576;
  object-fit: cover;
  border-radius: 14px;
  border: 1px solid var(--panel-border);
  transition: transform .25s, box-shadow .25s;
}
.image-gallery img:hover { transform: scale(1.02); box-shadow: 0 8px 30px rgba(34, 211, 238, 0.25); }

/* Articles */
.article-list { margin-top: 44px; display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.article {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 16px;
  padding: 28px 26px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}
.article h3 { font-size: 18px; margin-bottom: 10px; color: var(--cyan); }
.article p { color: var(--muted); font-size: 14px; }

/* Refund */
.refund-section { padding: 72px 0; }
.refund-box {
  background: linear-gradient(120deg, rgba(244, 63, 94, 0.12), rgba(251, 113, 133, 0.06));
  border: 1px solid rgba(244, 63, 94, 0.4);
  border-radius: 20px;
  padding: 48px 32px;
  text-align: center;
}
.refund-title { font-size: 28px; font-weight: 700; margin-bottom: 12px; }
.refund-box p { color: var(--muted); max-width: 620px; margin: 0 auto 26px; }

/* Footer */
.footer { border-top: 1px solid var(--panel-border); padding: 40px 0; text-align: center; }
.footer-brand { font-size: 20px; font-weight: 700; margin-bottom: 14px; }
.footer-nav { display: flex; gap: 20px; justify-content: center; flex-wrap: wrap; margin-bottom: 16px; }
.footer-nav a { color: var(--muted); text-decoration: none; font-size: 14px; }
.footer-nav a:hover { color: var(--cyan); }
.footer-copy { color: var(--muted); font-size: 12px; }

/* Responsive */
@media (max-width: 768px) {
  .nav { display: none; position: absolute; top: 64px; left: 0; right: 0; background: rgba(5, 6, 10, 0.97); flex-direction: column; padding: 20px; gap: 16px; border-bottom: 1px solid var(--panel-border); }
  .nav.open { display: flex; }
  .nav-toggle { display: block; }
  .feature-grid, .device-grid, .image-gallery, .article-list { grid-template-columns: 1fr; }
  .hero { padding: 60px 0 48px; }
  .hero-stats { gap: 24px; }
}

/* Download page */
.download-page { padding: 48px 0 64px; }
.download-head { text-align: center; margin-bottom: 32px; }
.buy-list { display: flex; flex-direction: column; gap: 16px; max-width: 560px; margin: 0 auto; }
.buy-card {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 16px;
  padding: 20px 22px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}
.buy-info h3 { font-size: 20px; }
.buy-info p { color: var(--muted); font-size: 13px; margin-top: 2px; }
.buy-card .btn { flex-shrink: 0; white-space: nowrap; }
@media (max-width: 560px) {
  .buy-card { flex-direction: column; align-items: stretch; text-align: center; }
  .buy-card .btn { width: 100%; }
}

/* Refund page */
.refund-page { padding: 56px 0 72px; }
.refund-card {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 20px;
  padding: 40px 32px;
  max-width: 560px;
  margin: 32px auto 0;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}
.refund-notice {
  background: rgba(34, 211, 238, 0.08);
  border: 1px solid rgba(34, 211, 238, 0.3);
  border-radius: 12px;
  padding: 16px 18px;
  color: var(--cyan);
  font-size: 15px;
  margin-bottom: 24px;
  text-align: center;
}
.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-size: 14px; color: var(--muted); margin-bottom: 8px; }
.form-group input, .form-group textarea {
  width: 100%;
  background: rgba(5, 6, 10, 0.6);
  border: 1px solid var(--panel-border);
  border-radius: 10px;
  padding: 12px 14px;
  color: var(--text);
  font-size: 15px;
  font-family: inherit;
}
.form-group input:focus, .form-group textarea:focus { outline: none; border-color: var(--cyan); }
.form-group textarea { min-height: 120px; resize: vertical; }
.refund-success { margin-top: 16px; color: var(--cyan); font-size: 14px; text-align: center; display: none; }

/* FAQ */
.faq-list { margin-top: 44px; max-width: 760px; margin-left: auto; margin-right: auto; display: flex; flex-direction: column; gap: 14px; }
.faq-item {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 14px;
  overflow: hidden;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}
.faq-item summary {
  cursor: pointer;
  padding: 18px 22px;
  font-weight: 600;
  font-size: 16px;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text);
}
.faq-item summary::after { content: "+"; color: var(--cyan); font-size: 20px; }
.faq-item[open] summary::after { content: "−"; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item p { padding: 0 22px 18px; color: var(--muted); font-size: 14px; }

html:not(.qznf) body {
            filter: blur(10px);
            -webkit-filter: blur(10px);
        }
        body {
            transition: filter 0.5s ease, opacity 0.5s ease;
        }