:root {
  --ink: #16332c;
  --muted: #5b746d;
  --teal: #00b894;
  --teal-dark: #007e67;
  --mint: #e9faf4;
  --line: #cfe8df;
  --paper: #fbfffd;
  --white: #ffffff;
  --orange: #f08a5d;
  --shadow: 0 12px 30px rgba(0, 126, 103, .12);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; font-family: "Segoe UI", "Microsoft YaHei", sans-serif; color: var(--ink); background: var(--paper); line-height: 1.75; }
a { color: var(--teal-dark); text-decoration: none; }
a:hover { color: var(--orange); }
img { max-width: 100%; height: auto; display: block; }
.wrap { width: min(1120px, calc(100% - 40px)); margin: 0 auto; }
.site-header { position: sticky; top: 0; z-index: 20; background: rgba(251,255,253,.94); border-bottom: 1px solid var(--line); backdrop-filter: blur(12px); }
.nav { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); font-weight: 800; letter-spacing: .03em; }
.brand img { width: 38px; height: 38px; border-radius: 10px; }
.brand span { font-size: 1.2rem; }
.nav-links { display: flex; flex-wrap: wrap; align-items: center; justify-content: flex-end; gap: 6px; }
.nav-links a { padding: 8px 12px; border-radius: 8px; color: var(--muted); font-size: .94rem; }
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--teal-dark); background: var(--mint); }
.hero { padding: 74px 0 54px; background: linear-gradient(120deg, #e9faf4 0%, #fbfffd 58%, #fff5ee 100%); border-bottom: 1px solid var(--line); }
.hero-grid { display: grid; grid-template-columns: 1.15fr .85fr; align-items: center; gap: 48px; }
.eyebrow { color: var(--teal-dark); font-size: .82rem; font-weight: 800; letter-spacing: .14em; text-transform: uppercase; }
h1 { margin: 10px 0 18px; font-size: clamp(2.25rem, 5vw, 4.4rem); line-height: 1.12; letter-spacing: 0; }
h2 { margin: 0 0 22px; font-size: clamp(1.45rem, 2vw, 2rem); line-height: 1.3; letter-spacing: 0; }
h3 { margin: 0 0 8px; font-size: 1.12rem; letter-spacing: 0; }
.lead { max-width: 640px; color: var(--muted); font-size: 1.08rem; }
.hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; margin-top: 26px; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 46px; padding: 10px 18px; border-radius: 8px; border: 1px solid transparent; font-weight: 800; cursor: pointer; transition: transform .2s, box-shadow .2s, background .2s; }
.button:hover { transform: translateY(-2px); box-shadow: 0 8px 18px rgba(0,126,103,.18); }
.button-primary { background: var(--teal); color: white; }
.button-secondary { border-color: var(--line); background: white; color: var(--teal-dark); }
.hero-meta { display: flex; flex-wrap: wrap; gap: 16px; margin-top: 22px; color: var(--muted); font-size: .9rem; }
.hero-meta strong { color: var(--ink); }
.hero-art { justify-self: center; width: min(100%, 330px); padding: 18px; background: white; border: 1px solid var(--line); border-radius: 18px; box-shadow: var(--shadow); transform: rotate(2deg); }
.hero-art img { width: 100%; border-radius: 10px; }
.section { padding: 68px 0; }
.section-tint { background: var(--mint); border-block: 1px solid var(--line); }
.section-head { display: flex; justify-content: space-between; align-items: end; gap: 20px; margin-bottom: 28px; }
.section-head p { margin: 0; color: var(--muted); max-width: 520px; }
.grid { display: grid; gap: 18px; }
.grid-2 { grid-template-columns: repeat(2, minmax(0,1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0,1fr)); }
.grid-4 { grid-template-columns: repeat(4, minmax(0,1fr)); }
.card { padding: 22px; background: white; border: 1px solid var(--line); border-radius: 10px; box-shadow: 0 6px 18px rgba(0,126,103,.06); }
.card p { margin: 8px 0 0; color: var(--muted); }
.metric { display: flex; align-items: baseline; gap: 8px; }
.metric strong { font-size: 2rem; color: var(--teal-dark); }
.metric span { color: var(--muted); font-size: .9rem; }
.feature-list { display: grid; gap: 12px; margin: 0; padding: 0; list-style: none; }
.feature-list li { display: flex; gap: 10px; align-items: flex-start; }
.feature-list li::before { content: "✓"; color: var(--teal); font-weight: 900; }
.screens { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 22px; align-items: start; }
.screens figure { margin: 0; text-align: center; }
.screens img { width: min(100%, 300px); margin: 0 auto; border: 1px solid var(--line); border-radius: 16px; box-shadow: var(--shadow); }
.screens figcaption { margin-top: 10px; color: var(--muted); font-size: .92rem; }
.timeline { position: relative; display: grid; gap: 18px; }
.timeline::before { content: ""; position: absolute; left: 12px; top: 8px; bottom: 8px; width: 2px; background: var(--line); }
.timeline-item { position: relative; padding-left: 40px; }
.timeline-item::before { content: ""; position: absolute; left: 5px; top: 9px; width: 16px; height: 16px; border-radius: 50%; background: var(--teal); border: 3px solid var(--paper); box-shadow: 0 0 0 2px var(--teal); }
.timeline-item time { color: var(--teal-dark); font-weight: 800; font-size: .9rem; }
.steps { counter-reset: step; display: grid; gap: 18px; }
.step { counter-increment: step; display: grid; grid-template-columns: 54px 1fr; gap: 18px; align-items: start; }
.step::before { content: counter(step); display: grid; place-items: center; width: 46px; height: 46px; border-radius: 50%; background: var(--teal); color: white; font-weight: 900; }
.faq { border-top: 1px solid var(--line); }
.faq details { padding: 18px 0; border-bottom: 1px solid var(--line); }
.faq summary { cursor: pointer; font-weight: 800; list-style: none; display: flex; justify-content: space-between; gap: 16px; }
.faq summary::after { content: "+"; color: var(--teal-dark); font-size: 1.4rem; line-height: 1; }
.faq details[open] summary::after { content: "−"; }
.faq details p { margin: 10px 0 0; color: var(--muted); }
.quote { border-left: 4px solid var(--teal); padding-left: 18px; }
.quote p { color: var(--ink); font-size: 1.04rem; }
.quote cite { color: var(--muted); font-style: normal; font-size: .9rem; }
.callout { padding: 24px 28px; background: #fff5ee; border: 1px solid #f7cfbb; border-radius: 10px; }
.callout strong { color: #a64f2f; }
.article { max-width: 850px; }
.article p { color: var(--muted); }
.article h2 { margin-top: 42px; }
.article ul { color: var(--muted); }
.site-footer { padding: 34px 0 24px; border-top: 1px solid var(--line); color: var(--muted); font-size: .88rem; }
.footer-grid { display: grid; grid-template-columns: 1.2fr 1fr 1fr; gap: 24px; }
.footer-grid h3 { color: var(--ink); font-size: .95rem; }
.footer-links { display: grid; gap: 6px; }
.footer-bottom { margin-top: 26px; padding-top: 16px; border-top: 1px solid var(--line); font-size: .82rem; }
.back-top { position: fixed; right: 20px; bottom: 20px; width: 42px; height: 42px; border: 1px solid var(--line); border-radius: 50%; background: white; color: var(--teal-dark); cursor: pointer; box-shadow: var(--shadow); opacity: 0; pointer-events: none; transition: opacity .2s; }
.back-top.show { opacity: 1; pointer-events: auto; }
@media (max-width: 820px) {
  .wrap { width: min(100% - 28px, 680px); }
  .nav { align-items: flex-start; padding: 14px 0; flex-direction: column; gap: 10px; }
  .nav-links { justify-content: flex-start; width: 100%; overflow-x: auto; flex-wrap: nowrap; padding-bottom: 2px; }
  .nav-links a { white-space: nowrap; padding: 6px 10px; }
  .hero { padding: 46px 0 38px; }
  .hero-grid { grid-template-columns: 1fr; gap: 28px; }
  .hero-art { width: min(100%, 290px); transform: none; }
  .section { padding: 48px 0; }
  .section-head { display: block; }
  .section-head p { margin-top: 8px; }
  .grid-3, .grid-4 { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .screens { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
}
@media (max-width: 500px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  h1 { font-size: 2.25rem; }
  .button { width: 100%; }
  .hero-actions { align-items: stretch; }
}