:root {
  --brand: #1d5a4b;
  --brand-d: #103a30;
  --brand-l: #2c7e68;
  --brand-soft: #e5efea;
  --accent: #6b4aae;
  --accent-d: #523690;
  --accent-soft: #efe9f9;
  --paper: #f4f4ef;
  --card: #ffffff;
  --ink: #1b2a25;
  --ink-2: #33453f;
  --muted: #5f716b;
  --line: #e1e1d8;
  --radius: 14px;
  --radius-lg: 20px;
  --shadow-sm: 0 1px 2px rgba(27, 42, 37, .05), 0 2px 8px rgba(27, 42, 37, .04);
  --shadow-md: 0 6px 18px rgba(16, 58, 48, .08), 0 2px 6px rgba(16, 58, 48, .05);
  --shadow-lg: 0 18px 44px rgba(16, 58, 48, .13);
  --maxw: 1160px;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Microsoft YaHei", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.78;
  letter-spacing: .01em;
}

img { max-width: 100%; display: block; border: 0; }
a { color: var(--brand); text-decoration: none; }
a:hover { color: var(--brand-l); }
ul, ol { padding-left: 1.25em; }
li { margin: .35em 0; }

h1, h2, h3, h4 { line-height: 1.35; color: var(--ink); margin: 0 0 .6em; font-weight: 700; }
h2 { font-size: 1.62rem; letter-spacing: .01em; }
h3 { font-size: 1.14rem; }
p { margin: 0 0 1em; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 22px; }
.section { padding: 70px 0; }
.section--alt { background: #fff; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }

.section-head { max-width: 720px; margin-bottom: 34px; }
.section-head p { color: var(--muted); margin: 0; }

.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(251, 249, 245, .93);
  backdrop-filter: saturate(150%) blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  max-width: var(--maxw); margin: 0 auto; padding: 10px 22px;
  display: flex; align-items: center; gap: 18px;
}
.brand { display: flex; align-items: center; gap: 10px; flex: 0 0 auto; }
.brand img { width: 38px; height: 38px; border-radius: 10px; box-shadow: var(--shadow-sm); }
.brand .brand-name {
  font-size: 1.36rem; font-weight: 700; color: var(--brand-d);
  letter-spacing: .04em; line-height: 1;
}
.nav-links { display: flex; align-items: center; gap: 4px; margin-left: auto; flex-wrap: wrap; }
.nav-links a {
  padding: 7px 12px; border-radius: 999px; color: var(--ink-2);
  font-size: .94rem; white-space: nowrap;
}
.nav-links a:hover { background: var(--brand-soft); color: var(--brand-d); }
.nav-links a.is-active { background: var(--brand); color: #fff; }
.nav-toggle {
  display: none; margin-left: auto; width: 42px; height: 38px; border: 1px solid var(--line);
  border-radius: 10px; background: #fff; cursor: pointer; padding: 0;
}
.nav-toggle span { display: block; width: 18px; height: 2px; margin: 4px auto; background: var(--brand-d); }
.btn-download {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 26px; border-radius: 999px; font-weight: 700; font-size: 1rem;
  color: #fff !important; background: linear-gradient(135deg, var(--accent), var(--accent-d));
  box-shadow: 0 6px 16px rgba(107, 74, 174, .30);
  transition: transform .16s ease, box-shadow .16s ease;
}
.btn-download:hover { transform: translateY(-2px); box-shadow: 0 10px 22px rgba(107, 74, 174, .36); color: #fff !important; }
.btn-download--sm { padding: 9px 18px; font-size: .92rem; }
.btn-ghost {
  display: inline-flex; align-items: center; gap: 8px; padding: 12px 24px;
  border-radius: 999px; border: 1px solid var(--brand); color: var(--brand) !important;
  font-weight: 600; background: #fff;
}
.btn-ghost:hover { background: var(--brand-soft); }

.hero { padding: 58px 0 62px; position: relative; overflow: hidden; }
.hero::before {
  content: ""; position: absolute; inset: 0;
  background:
    radial-gradient(680px 340px at 88% -8%, rgba(44, 126, 104, .12), transparent 62%),
    radial-gradient(520px 300px at 6% 108%, rgba(107, 74, 174, .10), transparent 60%);
  pointer-events: none;
}
.hero-grid {
  position: relative; display: grid; grid-template-columns: 1.12fr .88fr;
  gap: 48px; align-items: center;
}
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px; font-size: .84rem; font-weight: 600;
  color: var(--brand-d); background: var(--brand-soft); border: 1px solid #cfe2d9;
  padding: 5px 14px; border-radius: 999px; margin-bottom: 18px;
}
.hero h1 {
  font-size: 2.5rem; line-height: 1.24; margin: 0 0 16px; color: var(--brand-d);
  letter-spacing: .01em;
}
.hero h1 .hl { color: var(--accent-d); }
.hero-lead { font-size: 1.06rem; color: var(--ink-2); max-width: 560px; margin-bottom: 26px; }
.hero-actions { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; margin-bottom: 26px; }
.trust-row { display: flex; flex-wrap: wrap; gap: 10px 22px; margin-top: 6px; }
.trust-row li { list-style: none; font-size: .89rem; color: var(--ink-2); display: flex; align-items: center; gap: 7px; }
.trust-row { padding: 0; margin: 0; }
.trust-row .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--accent); flex: 0 0 auto; }

.phone-stack { display: flex; justify-content: center; gap: 18px; align-items: flex-start; }
.phone {
  background: #12261f; border-radius: 26px; padding: 9px;
  box-shadow: var(--shadow-lg); width: 100%;
}
.phone img { border-radius: 19px; width: 100%; height: auto; }
.phone--main { max-width: 268px; }
.phone--side { max-width: 208px; margin-top: 34px; }
.phone-stack .phone--side { display: none; }

.stat-band { background: var(--brand-d); color: #e6f1ec; padding: 30px 0; }
.stat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; text-align: center; }
.stat-grid .num { font-size: clamp(1.24rem, 2.6vw, 1.72rem); font-weight: 700; color: #fff; letter-spacing: .01em; white-space: nowrap; }
.stat-grid .lbl { font-size: .87rem; opacity: .82; }

.grid { display: grid; gap: 20px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }

.card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px; box-shadow: var(--shadow-sm);
}
.card h3 { margin-bottom: .4em; color: var(--brand-d); }
.card p { color: var(--muted); margin: 0; font-size: .95rem; }
.card .ico {
  width: 42px; height: 42px; border-radius: 12px; background: var(--brand-soft);
  display: flex; align-items: center; justify-content: center; margin-bottom: 14px; color: var(--brand);
}
.card .ico svg { width: 22px; height: 22px; }

.link-card {
  display: flex; flex-direction: column; gap: 8px; background: var(--card);
  border: 1px solid var(--line); border-left: 4px solid var(--brand);
  border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow-sm);
  transition: transform .16s ease, box-shadow .16s ease;
}
.link-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }
.link-card strong { font-size: 1.06rem; color: var(--brand-d); }
.link-card span { font-size: .93rem; color: var(--muted); }
.link-card em { font-style: normal; font-size: .86rem; color: var(--accent-d); font-weight: 600; }

.shot-grid { display: grid; gap: 24px; align-items: start; }
.shot-grid--phone { grid-template-columns: repeat(4, 1fr); }
.shot-item { margin: 0; }
.shot-item .frame {
  background: #12261f; border-radius: 20px; padding: 8px; box-shadow: var(--shadow-md);
}
.shot-item .frame img { border-radius: 14px; width: 100%; height: auto; }
.shot-item figcaption {
  margin-top: 12px; font-size: .89rem; color: var(--muted); text-align: center;
}
.shot-grid--wide { grid-template-columns: repeat(2, 1fr); }
.shot-grid--wide .frame {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 10px; box-shadow: var(--shadow-sm);
}
.shot-grid--wide .frame img { border-radius: 8px; width: 100%; height: auto; }

.quote {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px; box-shadow: var(--shadow-sm);
}
.quote .stars { color: var(--accent); letter-spacing: 2px; font-size: .95rem; margin-bottom: 10px; }
.quote p { color: var(--ink-2); font-size: .96rem; margin: 0 0 14px; }
.quote .who { display: flex; align-items: center; gap: 10px; font-size: .88rem; color: var(--muted); }
.quote .who .av {
  width: 32px; height: 32px; border-radius: 50%; background: var(--brand-soft); color: var(--brand-d);
  display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: .82rem;
}

.faq { display: grid; gap: 12px; }
.faq details {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 0 20px; box-shadow: var(--shadow-sm);
}
.faq summary {
  cursor: pointer; padding: 16px 0; font-weight: 600; color: var(--brand-d);
  list-style: none; display: flex; justify-content: space-between; gap: 16px; align-items: flex-start;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; color: var(--accent); font-weight: 700; font-size: 1.2rem; line-height: 1.2; }
.faq details[open] summary::after { content: "–"; }
.faq details p { margin: 0 0 18px; color: var(--muted); font-size: .95rem; }

.cta {
  background: linear-gradient(135deg, var(--brand-d), var(--brand));
  border-radius: var(--radius-lg); padding: 46px 40px; color: #e6f1ec;
  display: flex; align-items: center; justify-content: space-between; gap: 30px; flex-wrap: wrap;
  box-shadow: var(--shadow-lg);
}
.cta h2 { color: #fff; margin: 0 0 8px; }
.cta p { margin: 0; opacity: .88; font-size: .96rem; max-width: 560px; }

.page-head { background: #fff; border-bottom: 1px solid var(--line); padding: 46px 0 40px; }
.crumb { font-size: .87rem; color: var(--muted); margin-bottom: 12px; }
.crumb a { color: var(--muted); }
.crumb a:hover { color: var(--brand); }
.page-head h1 { font-size: 2rem; margin: 0 0 12px; color: var(--brand-d); max-width: 880px; }
.page-head .lead { color: var(--muted); max-width: 760px; margin: 0; }

.article { max-width: 880px; }
.article h2 {
  margin: 44px 0 14px; padding-left: 14px; border-left: 4px solid var(--accent);
  font-size: 1.38rem;
}
.article h3 { margin: 26px 0 8px; color: var(--brand-d); }
.article p, .article li { color: var(--ink-2); }
.article ul, .article ol { margin: 0 0 1.1em; }
.article .box {
  background: var(--accent-soft); border: 1px solid #ddd0ef; border-radius: var(--radius);
  padding: 20px 22px; margin: 24px 0;
}
.article .box strong { color: var(--accent-d); }
.article .steps { counter-reset: s; list-style: none; padding: 0; }
.article .steps > li {
  counter-increment: s; position: relative; padding-left: 46px; margin: 0 0 16px;
}
.article .steps > li::before {
  content: counter(s); position: absolute; left: 0; top: 1px; width: 30px; height: 30px;
  border-radius: 50%; background: var(--brand); color: #fff; font-weight: 700; font-size: .9rem;
  display: flex; align-items: center; justify-content: center;
}
.article table { width: 100%; border-collapse: collapse; margin: 20px 0; font-size: .94rem; }
.article th, .article td { border: 1px solid var(--line); padding: 10px 12px; text-align: left; vertical-align: top; }
.article th { background: var(--brand-soft); color: var(--brand-d); font-weight: 600; }
.article .related {
  margin-top: 44px; padding: 22px 24px; background: #fff; border: 1px solid var(--line);
  border-radius: var(--radius); box-shadow: var(--shadow-sm);
}
.article .related h2 { margin: 0 0 10px; border: 0; padding: 0; font-size: 1.14rem; }
.article .related ul { margin: 0; }

.site-footer { background: #0e2b23; color: #b7cbc3; padding: 52px 0 26px; margin-top: 0; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 34px; }
.site-footer h4 { color: #fff; font-size: .98rem; margin: 0 0 14px; }
.site-footer a { color: #cfe2d8; }
.site-footer a:hover { color: #fff; }
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer li { margin: 0 0 8px; font-size: .92rem; }
.footer-brand { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; }
.footer-brand img { width: 34px; height: 34px; border-radius: 9px; }
.footer-brand span { font-size: 1.2rem; font-weight: 700; color: #fff; letter-spacing: .04em; }
.site-footer p { font-size: .92rem; margin: 0 0 10px; }
.disclaimer {
  margin-top: 34px; padding-top: 20px; border-top: 1px solid rgba(255, 255, 255, .14);
  font-size: .87rem; color: #9db8ac;
}
.copyright { margin-top: 12px; font-size: .84rem; color: #8aa398; }

.to-top {
  position: fixed; right: 22px; bottom: 26px; width: 44px; height: 44px; border-radius: 50%;
  background: var(--brand); color: #fff; border: 0; cursor: pointer; box-shadow: var(--shadow-md);
  display: none; align-items: center; justify-content: center; font-size: 1.1rem; z-index: 60;
}
.to-top.show { display: flex; }

@media (max-width: 1024px) {
  .hero-grid { grid-template-columns: 1fr; gap: 36px; }
  .phone-stack { justify-content: flex-start; }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .shot-grid--phone { grid-template-columns: repeat(3, 1fr); }
  .stat-grid { grid-template-columns: repeat(2, 1fr); gap: 26px; }
}
@media (max-width: 760px) {
  body { font-size: 15.5px; }
  .nav-inner { padding: 10px 18px; }
  .nav-toggle { display: block; }
  .nav-links {
    display: none; position: absolute; left: 0; right: 0; top: 100%;
    background: #fff; border-bottom: 1px solid var(--line); flex-direction: column;
    align-items: stretch; padding: 10px 18px 16px; gap: 2px; margin: 0;
    box-shadow: var(--shadow-md);
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 10px 12px; border-radius: 8px; }
  .nav-links .btn-download { margin-top: 8px; }
  .hero { padding: 40px 0 48px; }
  .hero h1 { font-size: 1.72rem; }
  .section { padding: 52px 0; }
  .stat-band { padding: 24px 0; }
  .stat-grid { gap: 18px 12px; }
  .stat-grid .num { font-size: 1.26rem; }
  .stat-grid .lbl { font-size: .8rem; }
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .shot-grid--phone { grid-template-columns: repeat(2, 1fr); gap: 14px; }
  .shot-grid--wide { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 26px; }
  .cta { padding: 34px 24px; }
  .page-head { padding: 34px 0 30px; }
  .page-head h1 { font-size: 1.5rem; }
  .article h2 { font-size: 1.2rem; }
}
@media (max-width: 420px) {
  .shot-grid--phone { grid-template-columns: 1fr 1fr; }
  .stat-grid { grid-template-columns: 1fr 1fr; }
  .stat-grid .num { font-size: 1.14rem; }
  .hero h1 { font-size: 1.56rem; }
}