:root {
  --bg: #04060e;
  --bg-soft: #080d1a;
  --panel: #0f1726;
  --panel-2: #16203a;
  --line: #22314e;
  --line-soft: #182338;

  --brand: #3d6bff;
  --brand-2: #86a6ff;
  --brand-deep: #173a9e;
  --accent: #9b8cff;
  --pop: #ff6fa5;

  --text: #e8eeff;
  --muted: #94a6c9;
  --muted-2: #6d7ea3;

  --radius: 8px;
  --radius-sm: 5px;
  --shadow: 0 18px 42px rgba(2, 5, 16, 0.68);
  --glow: inset 0 2px 0 0 var(--brand), 0 16px 38px rgba(23, 58, 158, 0.34);
  --max: 1180px;
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "Microsoft YaHei", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.78;
  color: var(--text);
  background-color: var(--bg);
  background-image:
    radial-gradient(1120px 640px at 10% -8%, rgba(23, 58, 158, 0.55), transparent 62%),
    radial-gradient(920px 540px at 94% 2%, rgba(14, 96, 168, 0.34), transparent 60%),
    radial-gradient(780px 500px at 52% 108%, rgba(88, 70, 176, 0.24), transparent 66%);
  background-attachment: fixed;
}

img { max-width: 100%; height: auto; display: block; border: 0; }

a { color: var(--brand-2); text-decoration: none; transition: color .2s ease; }
a:hover { color: var(--accent); }

h1, h2, h3, h4 { margin: 0 0 14px; line-height: 1.35; font-weight: 700; letter-spacing: .2px; }
h1 { font-size: 40px; }
h2 { font-size: 28px; }
h3 { font-size: 19px; }
p { margin: 0 0 14px; }

ul, ol { margin: 0 0 14px; padding-left: 22px; }
li { margin-bottom: 8px; }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 20px; }

.skip {
  position: absolute; top: 0; left: 0; width: 1px; height: 1px;
  overflow: hidden; white-space: nowrap; clip: rect(0 0 0 0);
}
.skip:focus {
  position: fixed; width: auto; height: auto; overflow: visible; clip: auto;
  left: 12px; top: 12px; padding: 10px 16px; z-index: 200;
  background: var(--brand); color: #fff;
}

.site-header {
  position: sticky; top: 0; z-index: 90;
  background: rgba(5, 8, 18, 0.86);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
.nav {
  max-width: var(--max); margin: 0 auto; padding: 12px 20px;
  display: flex; align-items: center; gap: 18px;
}
.brand { display: flex; align-items: center; gap: 12px; flex: 0 0 auto; }
.brand img { width: 42px; height: 42px; border-radius: 11px; box-shadow: var(--glow); }
.brand-name {
  font-size: 19px; font-weight: 700; color: #fff; letter-spacing: .5px; line-height: 1.2;
}
.brand-sub { display: block; font-size: 11px; color: var(--muted-2); letter-spacing: 2.4px; font-weight: 400; }

.nav-links {
  display: flex; align-items: center; gap: 4px; margin-left: auto;
  list-style: none; padding: 0; margin-bottom: 0;
}
.nav-links a {
  display: block; padding: 8px 14px; border-radius: 999px;
  font-size: 15px; color: var(--muted);
}
.nav-links a:hover { color: #fff; background: rgba(61, 107, 255, 0.16); }
.nav-links a[aria-current="page"] { color: #fff; background: rgba(61, 107, 255, 0.26); }

.nav-cta {
  margin-left: 10px; padding: 10px 20px !important; border-radius: 999px !important;
  background: linear-gradient(135deg, #4f7bff, #1f47c4) !important;
  color: #fff !important; font-weight: 700; box-shadow: 0 8px 22px rgba(109, 40, 217, .45);
}
.nav-cta:hover { filter: brightness(1.1); }

.nav-toggle {
  display: none; margin-left: auto; width: 44px; height: 40px;
  background: rgba(61, 107, 255, .16); border: 1px solid rgba(61, 107, 255, .45); box-shadow: none;
  border-radius: 10px; cursor: pointer; padding: 0;
}
.nav-toggle span { display: block; width: 20px; height: 2px; margin: 4px auto; background: var(--text); }

.section { padding: 66px 0; }
.section-tight { padding: 44px 0; }
.section-head { max-width: 780px; margin-bottom: 32px; }
.section-kicker {
  display: inline-block; font-size: 12px; letter-spacing: 3px; text-transform: uppercase;
  color: var(--accent); margin-bottom: 10px;
}
.section-head p { color: var(--muted); font-size: 16px; margin-bottom: 0; }

.hero { padding: 58px 0 40px; }
.hero-grid { display: grid; grid-template-columns: 1.08fr .92fr; gap: 46px; align-items: center; }
.hero h1 { font-size: 46px; margin-bottom: 18px; }
.hero h1 .hl {
  background: linear-gradient(120deg, var(--accent), var(--brand-2) 58%, var(--pop));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero-lead { font-size: 17px; color: var(--muted); max-width: 560px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin: 26px 0 18px; }

.btn {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 14px 30px; border-radius: 999px; font-size: 16px; font-weight: 700;
  cursor: pointer; border: 1px solid transparent; transition: transform .18s ease, filter .18s ease;
}
.btn-primary {
  background: linear-gradient(135deg, #5b86ff 0%, #2f57e0 52%, #173a9e 100%);
  color: #fff; box-shadow: 0 14px 34px rgba(109, 40, 217, .5);
}
.btn-primary:hover { transform: translateY(-2px); filter: brightness(1.09); color: #fff; }
.btn-ghost { background: rgba(61, 107, 255, .12); border-color: var(--line); color: var(--text); }
.btn-ghost:hover { background: rgba(61, 107, 255, .22); color: #fff; }
.btn svg { width: 18px; height: 18px; flex: 0 0 auto; }

.hero-note { font-size: 13px; color: var(--muted-2); }
.hero-note b { color: var(--accent); font-weight: 600; }

.hero-visual { position: relative; display: flex; justify-content: center; }
.hero-visual::before {
  content: ""; position: absolute; inset: 6% 12% 4%;
  background: radial-gradient(closest-side, rgba(38, 82, 214, .5), transparent 72%);
  filter: blur(24px); z-index: 0;
}
.phone-frame {
  position: relative; z-index: 1; width: 306px; padding: 11px;
  border-radius: 34px; background: linear-gradient(160deg, #1b2848, #0a1020);
  border: 0; box-shadow: inset 0 2px 0 0 rgba(61, 107, 255, .42); box-shadow: var(--shadow);
}
.phone-frame img { border-radius: 25px; }
.phone-badge {
  position: absolute; z-index: 2; left: -22px; bottom: 62px;
  background: rgba(15, 23, 38, .95); border: 0; box-shadow: inset 0 2px 0 0 rgba(61, 107, 255, .42);
  border-radius: 14px; padding: 10px 14px; font-size: 13px; color: var(--muted);
  box-shadow: var(--shadow);
}
.phone-badge strong { display: block; color: var(--pop); font-size: 17px; }

.stat-bar {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px;
  background: var(--line-soft); border: 0; box-shadow: inset 0 2px 0 0 rgba(61, 107, 255, .42);
  border-radius: var(--radius); overflow: hidden;
}
.stat { background: rgba(15, 23, 38, .9); padding: 22px 18px; text-align: center; }
.stat b { display: block; font-size: 26px; color: #fff; line-height: 1.3; }
.stat b em { font-style: normal; font-size: 14px; color: var(--accent); }
.stat span { font-size: 13px; color: var(--muted-2); }

.grid { display: grid; gap: 20px; }
.g-3 { grid-template-columns: repeat(3, 1fr); }
.g-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: linear-gradient(165deg, rgba(22, 32, 58, .92), rgba(15, 23, 38, .92));
  border: 0; box-shadow: inset 0 2px 0 0 rgba(61, 107, 255, .42); border-radius: var(--radius);
  padding: 26px 24px; position: relative; overflow: hidden;
  transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--glow); }
.card h3 { color: #fff; margin-bottom: 10px; }
.card p { color: var(--muted); font-size: 15px; margin-bottom: 0; }
.card .idx {
  position: absolute; right: 16px; top: 8px; font-size: 42px; font-weight: 800;
  color: rgba(61, 107, 255, .16); line-height: 1;
}
.card-link { display: inline-block; margin-top: 12px; font-size: 14px; font-weight: 600; }

.card-icon {
  width: 44px; height: 44px; border-radius: 12px; margin-bottom: 14px;
  display: flex; align-items: center; justify-content: center;
  background: rgba(61, 107, 255, .16); border: 1px solid rgba(61, 107, 255, .35);
}
.card-icon svg { width: 22px; height: 22px; stroke: var(--accent); fill: none; stroke-width: 1.8; }

.channels { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.channel {
  border: 0; box-shadow: inset 0 2px 0 0 rgba(61, 107, 255, .42); border-radius: var(--radius); padding: 22px;
  background: linear-gradient(150deg, rgba(26, 38, 68, .95), rgba(12, 18, 32, .95));
  position: relative; overflow: hidden;
}
.channel::after {
  content: ""; position: absolute; right: -30px; top: -30px; width: 110px; height: 110px;
  border-radius: 50%; background: radial-gradient(closest-side, rgba(134, 166, 255, .28), transparent);
}
.channel h3 { color: #fff; font-size: 17px; margin-bottom: 6px; }
.channel p { color: var(--muted); font-size: 14px; margin: 0; }
.channel .tag {
  display: inline-block; font-size: 11px; letter-spacing: 1.6px; color: var(--accent);
  border: 1px solid rgba(155, 140, 255, .35); border-radius: 999px;
  padding: 2px 10px; margin-bottom: 12px;
}

.shots { display: grid; grid-template-columns: repeat(5, 1fr); gap: 18px; }
.shot {
  background: rgba(15, 23, 38, .85); border: 0; box-shadow: inset 0 2px 0 0 rgba(61, 107, 255, .42);
  border-radius: 14px; padding: 10px; text-align: center; cursor: zoom-in;
}
.shot img { border-radius: 9px; margin: 0 auto; width: 100%; height: auto; }
.shot span { display: block; margin-top: 10px; font-size: 13px; color: var(--muted); }

.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; counter-reset: st; }
.step {
  background: rgba(15, 23, 38, .78); border: 0; box-shadow: inset 0 2px 0 0 rgba(61, 107, 255, .42);
  border-radius: var(--radius); padding: 24px 22px; position: relative;
}
.step::before {
  counter-increment: st; content: "0" counter(st);
  display: block; font-size: 15px; font-weight: 800; letter-spacing: 2px;
  color: var(--brand-2); margin-bottom: 10px;
}
.step h3 { color: #fff; font-size: 16px; }
.step p { color: var(--muted); font-size: 14px; margin: 0; }

.quotes { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.quote {
  background: rgba(15, 23, 38, .8); border: 0; box-shadow: inset 0 2px 0 0 rgba(61, 107, 255, .42);
  border-radius: var(--radius); padding: 24px;
}
.quote .stars { color: var(--pop); font-size: 14px; letter-spacing: 2px; margin-bottom: 12px; }
.quote p { color: var(--text); font-size: 15px; }
.quote cite { display: block; font-style: normal; font-size: 13px; color: var(--muted-2); }

.faq-list { display: grid; gap: 12px; }
.faq-item {
  background: rgba(15, 23, 38, .8); border: 0; box-shadow: inset 0 2px 0 0 rgba(61, 107, 255, .42);
  border-radius: var(--radius-sm); overflow: hidden;
}
.faq-item summary {
  cursor: pointer; padding: 16px 20px; font-weight: 600; color: #fff;
  list-style: none; display: flex; gap: 12px; align-items: flex-start; font-size: 15.5px;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::before {
  content: "?"; flex: 0 0 22px; width: 22px; height: 22px; border-radius: 50%;
  background: rgba(61, 107, 255, .25); color: var(--accent);
  font-size: 13px; font-weight: 800; text-align: center; line-height: 22px; margin-top: 3px;
}
.faq-item[open] summary { color: var(--brand-2); }
.faq-body { padding: 0 20px 18px 54px; color: var(--muted); font-size: 15px; }
.faq-body p:last-child { margin-bottom: 0; }

.page-hero { padding: 46px 0 26px; border-bottom: 1px solid var(--line-soft); }
.breadcrumb { font-size: 13px; color: var(--muted-2); margin-bottom: 14px; }
.breadcrumb a { color: var(--muted); }
.page-hero h1 { font-size: 34px; }
.page-hero .lead { color: var(--muted); max-width: 760px; margin-bottom: 0; }

.prose { max-width: 860px; }
.prose h2 { margin-top: 44px; padding-top: 8px; position: relative; }
.prose h2::before {
  content: ""; display: block; width: 44px; height: 3px; border-radius: 2px;
  background: linear-gradient(90deg, var(--brand), var(--accent)); margin-bottom: 14px;
}
.prose h3 { color: #fff; margin-top: 28px; }
.prose p, .prose li { color: var(--muted); font-size: 16px; }
.prose strong { color: var(--text); }

.callout {
  border-left: 3px solid var(--brand); background: rgba(61, 107, 255, .1);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 16px 20px; margin: 0 0 20px; color: var(--muted); font-size: 15px;
}
.callout b { color: var(--accent); }

.toc {
  background: rgba(15, 23, 38, .8); border: 0; box-shadow: inset 0 2px 0 0 rgba(61, 107, 255, .42);
  border-radius: var(--radius); padding: 20px 24px; margin: 0 0 26px;
}
.toc strong { display: block; color: #fff; margin-bottom: 10px; font-size: 14px; letter-spacing: 1px; }
.toc ol { margin: 0; padding-left: 20px; }
.toc li { margin-bottom: 4px; font-size: 15px; }

.download-band {
  border-radius: 22px; padding: 44px 38px; text-align: center;
  background: linear-gradient(135deg, rgba(76, 29, 149, .75), rgba(14, 13, 38, .9) 55%, rgba(16, 78, 110, .7));
  border: 0; box-shadow: inset 0 3px 0 0 var(--brand), var(--shadow);
}
.download-band h2 { color: #fff; margin-bottom: 10px; }
.download-band p { color: var(--muted); max-width: 700px; margin: 0 auto 24px; }
.download-band .btn { margin: 0 auto; }

.site-footer {
  margin-top: 60px; border-top: 1px solid var(--line);
  background: rgba(3, 6, 14, .86); padding: 44px 0 26px;
}
.footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1.2fr; gap: 30px; }
.footer-grid h4 { font-size: 14px; color: #fff; margin-bottom: 14px; letter-spacing: 1px; }
.footer-grid ul { list-style: none; padding: 0; margin: 0; }
.footer-grid li { margin-bottom: 9px; }
.footer-grid a, .footer-grid p { color: var(--muted-2); font-size: 14px; }
.footer-brand { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; }
.footer-brand img { width: 38px; height: 38px; border-radius: 10px; }
.footer-brand b { color: #fff; font-size: 17px; }

.disclaimer {
  margin-top: 30px; padding: 16px 20px; border-radius: var(--radius-sm);
  background: rgba(15, 23, 38, .7); border: 1px solid var(--line-soft);
  color: var(--muted-2); font-size: 13.5px;
}
.copyright {
  margin-top: 18px; padding-top: 18px; border-top: 1px solid var(--line-soft);
  color: var(--muted-2); font-size: 13px; display: flex; flex-wrap: wrap; gap: 8px 18px;
  justify-content: space-between;
}

.lightbox {
  position: fixed; inset: 0; z-index: 300; display: flex;
  background: rgba(2, 4, 12, .92); align-items: center; justify-content: center; padding: 26px;
}
.lightbox img { max-height: 88vh; max-width: 92vw; width: auto; border-radius: 14px; border: 0; box-shadow: inset 0 2px 0 0 rgba(61, 107, 255, .42); }
.lightbox-close {
  position: absolute; top: 20px; right: 24px; width: 44px; height: 44px; border-radius: 50%;
  background: rgba(61, 107, 255, .28); border: 0; color: #fff;
  font-size: 22px; line-height: 1; cursor: pointer;
}

.to-top {
  position: fixed; right: 22px; bottom: 26px; z-index: 80;
  width: 46px; height: 46px; border-radius: 50%; cursor: pointer; display: block;
  background: rgba(61, 107, 255, .32); border: 0; color: #fff;
  font-size: 18px; backdrop-filter: blur(8px);
}

.reveal { transition: opacity .6s ease, transform .6s ease; }

@media (prefers-reduced-motion: reduce) {
  .reveal { transition: none; }
  html { scroll-behavior: auto; }
}

@media (max-width: 1024px) {
  .hero-grid { grid-template-columns: 1fr; gap: 34px; }
  .hero h1 { font-size: 38px; }
  .g-4 { grid-template-columns: repeat(2, 1fr); }
  .shots { grid-template-columns: repeat(4, 1fr); }
  .channels { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .nav-toggle { display: block; }
  .nav-links {
    display: none; position: absolute; left: 0; right: 0; top: 100%;
    flex-direction: column; align-items: stretch; gap: 2px; padding: 12px 18px 18px;
    background: rgba(6, 10, 22, .98); border-bottom: 1px solid var(--line);
  }
  .nav-toggle[aria-expanded="true"] + .nav-links { display: flex; }
  .nav-links a { padding: 12px 14px; }
  .nav-cta { margin: 8px 0 0; text-align: center; }
}

@media (max-width: 700px) {
  body { font-size: 15.5px; }
  h1 { font-size: 29px; }
  h2 { font-size: 23px; }
  .hero { padding: 34px 0 22px; }
  .hero h1 { font-size: 30px; }
  .section { padding: 46px 0; }
  .g-3, .g-4, .channels, .steps, .quotes { grid-template-columns: 1fr; }
  .shots { grid-template-columns: repeat(2, 1fr); }
  .stat-bar { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr; }
  .phone-frame { width: 246px; }
  .phone-badge { left: -8px; bottom: 34px; }
  .download-band { padding: 32px 22px; }
  .page-hero h1 { font-size: 26px; }
  .faq-body { padding-left: 20px; }
}