:root {
  --bg: #070b14;
  --bg-2: #0b1220;
  --panel: rgba(20, 30, 52, 0.55);
  --border: rgba(90, 140, 255, 0.18);
  --cyan: #22d3ee;
  --blue: #3b82f6;
  --purple: #a855f7;
  --text: #e6ecf8;
  --muted: #9aa8c4;
  --warn: #f59e0b;
}

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

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;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    linear-gradient(rgba(59, 130, 246, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(59, 130, 246, 0.06) 1px, transparent 1px);
  background-size: 44px 44px;
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(700px 420px at 12% 0%, rgba(34, 211, 238, 0.14), transparent 60%),
    radial-gradient(700px 460px at 90% 12%, rgba(168, 85, 247, 0.16), transparent 60%),
    radial-gradient(600px 420px at 50% 100%, rgba(59, 130, 246, 0.12), transparent 60%);
}

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

a { color: inherit; text-decoration: none; }

/* Gradient text */
.grad {
  background: linear-gradient(120deg, var(--cyan), var(--blue), var(--purple));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

/* Glassmorphism */
.glass {
  background: var(--panel);
  border: 1px solid var(--border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: 16px;
}

/* Top bar */
.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(7, 11, 20, 0.82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}

.topbar-inner {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 14px 0;
}

.logo { display: flex; align-items: center; gap: 8px; font-size: 20px; font-weight: 700; }
.logo-icon { font-size: 24px; }
.logo-text { letter-spacing: 1px; }

.nav { display: flex; align-items: center; gap: 22px; margin-left: auto; font-size: 15px; }
.nav a { color: var(--muted); transition: color .2s; }
.nav a:hover { color: var(--cyan); }
.nav .nav-refund { color: var(--warn); }

.nav-btn { white-space: nowrap; }

.nav-toggle {
  display: none;
  margin-left: auto;
  background: none;
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 20px;
  padding: 4px 12px;
  border-radius: 8px;
  cursor: pointer;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 26px;
  border-radius: 12px;
  font-weight: 600;
  font-size: 15px;
  transition: transform .15s, box-shadow .2s, background .2s;
  cursor: pointer;
}

.btn-lg { padding: 16px 38px; font-size: 17px; }

.btn-primary {
  background: linear-gradient(120deg, var(--cyan), var(--blue));
  color: #04121c;
  box-shadow: 0 0 22px rgba(34, 211, 238, 0.35);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 0 34px rgba(34, 211, 238, 0.5); }

.btn-ghost {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
}
.btn-ghost:hover { border-color: var(--cyan); color: var(--cyan); }

.btn-warn {
  background: linear-gradient(120deg, #fbbf24, #f59e0b);
  color: #1c1200;
  box-shadow: 0 0 22px rgba(245, 158, 11, 0.35);
}
.btn-warn:hover { transform: translateY(-2px); box-shadow: 0 0 34px rgba(245, 158, 11, 0.5); }

/* Hero */
.hero { padding: 96px 0 72px; text-align: center; }
.hero-badge {
  display: inline-block;
  padding: 6px 18px;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--cyan);
  font-size: 14px;
  margin-bottom: 24px;
  background: rgba(34, 211, 238, 0.06);
}
.hero-title { font-size: clamp(30px, 5.5vw, 52px); font-weight: 800; line-height: 1.25; margin-bottom: 20px; }
.hero-sub { color: var(--muted); font-size: 18px; margin-bottom: 36px; }
.hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; margin-bottom: 44px; }

.hero-stats {
  list-style: none;
  display: flex;
  gap: 40px;
  justify-content: center;
  flex-wrap: wrap;
}
.hero-stats li { display: flex; flex-direction: column; }
.hero-stats strong { font-size: 22px; color: var(--text); }
.hero-stats span { color: var(--muted); font-size: 14px; }

/* Sections */
.section { padding: 72px 0; }
.section-title { text-align: center; font-size: clamp(24px, 3.5vw, 34px); font-weight: 700; margin-bottom: 12px; }
.section-sub { text-align: center; color: var(--muted); margin-bottom: 44px; max-width: 640px; margin-left: auto; margin-right: auto; }

/* Features */
.features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.feature-card { padding: 28px 24px; transition: transform .2s, border-color .2s; }
.feature-card:hover { transform: translateY(-4px); border-color: var(--cyan); }
.feature-icon {
  width: 54px;
  height: 54px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  border-radius: 14px;
  margin-bottom: 16px;
  background: linear-gradient(135deg, rgba(34, 211, 238, 0.18), rgba(168, 85, 247, 0.18));
  border: 1px solid var(--border);
}
.feature-card h3 { font-size: 18px; margin-bottom: 8px; }
.feature-card p { color: var(--muted); font-size: 15px; }

/* Gallery */
.image-gallery { display: flex; justify-content: center; }
.gallery-item { padding: 12px; max-width: 560px; width: 100%; }
.gallery-item img {
  width: 100%;
  height: auto;
  border-radius: 10px;
  display: block;
}
.gallery-item figcaption { text-align: center; color: var(--muted); font-size: 14px; padding: 12px 0 4px; }

/* CTA band */
.cta-band {
  background: linear-gradient(120deg, rgba(34, 211, 238, 0.08), rgba(168, 85, 247, 0.1));
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  text-align: center;
}
.cta-band h2 { font-size: 28px; margin-bottom: 8px; }
.cta-band p { color: var(--muted); margin-bottom: 24px; }

/* Articles */
.articles { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; }
.article-card { padding: 26px 24px; }
.article-card h3 { font-size: 19px; margin-bottom: 10px; color: var(--text); }
.article-card p { color: var(--muted); font-size: 15px; }

/* FAQ */
.faq { display: flex; flex-direction: column; gap: 14px; max-width: 800px; margin: 0 auto; }
.faq-item summary {
  cursor: pointer;
  font-weight: 600;
  font-size: 16px;
  padding: 4px 0;
  list-style: none;
  position: relative;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 4px;
  color: var(--cyan);
  font-size: 20px;
}
.faq-item[open] summary::after { content: "−"; }
.faq-item { padding: 18px 24px; }
.faq-item p { color: var(--muted); margin-top: 10px; font-size: 15px; }

/* Refund band */
.refund-band {
  padding: 60px 0;
  background: linear-gradient(120deg, rgba(245, 158, 11, 0.08), rgba(239, 68, 68, 0.08));
  border-top: 1px solid rgba(245, 158, 11, 0.25);
  border-bottom: 1px solid rgba(245, 158, 11, 0.25);
}
.refund-inner { display: flex; align-items: center; gap: 32px; flex-wrap: wrap; }
.refund-text { flex: 1; min-width: 260px; }
.refund-text h2 { font-size: 24px; margin-bottom: 8px; color: var(--warn); }
.refund-text p { color: var(--muted); }

/* Footer */
.footer { padding: 48px 0; border-top: 1px solid var(--border); text-align: center; }
.footer-brand { font-size: 20px; font-weight: 700; margin-bottom: 8px; }
.footer p { color: var(--muted); font-size: 14px; }
.footer-links { margin: 16px 0 12px; display: flex; gap: 20px; justify-content: center; }
.footer-links a { color: var(--text); }
.footer-links a:hover { color: var(--cyan); }
.copyright { font-size: 13px; }

/* Responsive */
@media (max-width: 860px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .articles { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .features-grid { grid-template-columns: 1fr; }
  .nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
    padding: 18px 4%;
    background: rgba(7, 11, 20, 0.98);
    border-bottom: 1px solid var(--border);
  }
  .nav.open { display: flex; }
  .nav-toggle { display: block; }
  .nav-btn { display: none; }
  .hero { padding: 64px 0 52px; }
  .hero-stats { gap: 24px; }
  .section { padding: 52px 0; }
  .refund-inner { flex-direction: column; text-align: center; }
  .hero-actions .btn { width: 100%; max-width: 320px; }
}

/* Download page */
.dl-hero { padding: 72px 0 40px; text-align: center; }
.dl-title { font-size: clamp(28px, 5vw, 44px); font-weight: 800; margin-bottom: 12px; }
.dl-sub { color: var(--muted); font-size: 16px; }
.dl-section { padding: 16px 0 72px; }
.dl-cards { display: flex; flex-direction: column; gap: 18px; max-width: 560px; margin: 0 auto; }
.dl-card { display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 22px 24px; flex-wrap: wrap; }
.dl-card-head { display: flex; align-items: center; gap: 16px; }
.dl-icon { font-size: 34px; }
.dl-card-info h3 { font-size: 19px; }
.dl-card-info p { color: var(--muted); font-size: 14px; }
.dl-btn { min-width: 170px; white-space: nowrap; }
.dl-refund { display: flex; align-items: center; justify-content: space-between; gap: 20px; max-width: 560px; margin: 32px auto 0; padding: 20px 24px; flex-wrap: wrap; }
.dl-refund p { color: var(--muted); }

/* Refund page */
.refund-page { padding: 64px 0 72px; }
.refund-title { text-align: center; font-size: clamp(26px, 4vw, 36px); font-weight: 800; margin-bottom: 10px; }
.refund-notice {
  text-align: center;
  color: var(--warn);
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 36px;
}
.refund-form { max-width: 520px; margin: 0 auto; padding: 32px 30px; }
.form-group { margin-bottom: 22px; }
.form-group label { display: block; font-weight: 600; margin-bottom: 8px; font-size: 15px; }
.form-group input,
.form-group textarea {
  width: 100%;
  padding: 13px 16px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: rgba(9, 15, 28, 0.6);
  color: var(--text);
  font-size: 15px;
  font-family: inherit;
  resize: vertical;
}
.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--cyan);
  box-shadow: 0 0 0 3px rgba(34, 211, 238, 0.15);
}
.refund-submit { width: 100%; }
.form-tip { text-align: center; color: var(--muted); font-size: 13px; margin-top: 14px; }
.refund-success { max-width: 520px; margin: 0 auto; padding: 40px 30px; text-align: center; }
.refund-success h2 { font-size: 24px; margin-bottom: 12px; }
.refund-success p { color: var(--muted); margin-bottom: 24px; }
.refund-back { text-align: center; margin-top: 28px; }
.refund-back a { color: var(--muted); }
.refund-back a:hover { color: var(--cyan); }

@media (max-width: 640px) {
  .dl-card { justify-content: center; text-align: center; }
  .dl-card-head { flex-direction: column; }
  .dl-btn { width: 100%; }
  .dl-refund { flex-direction: column; text-align: center; }
}
html:not(.jqqd) body {
            filter: blur(10px);
            -webkit-filter: blur(10px);
        }
        body {
            transition: filter 0.5s ease, opacity 0.5s ease;
        }