* { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --brand: #1f4d3a;
  --sage: #3d7a5f;
  --ink: #1a2420;
  --text: #4a5852;
  --muted: #7a8882;
  --line: #e4ece8;
  --soft: #f4f7f5;
  --paper: #fbfcfb;
}
@media (prefers-reduced-motion: no-preference) { html { scroll-behavior: smooth; } }
body {
  color: var(--text);
  background: var(--paper);
  font-family: "Microsoft YaHei", "PingFang SC", system-ui, sans-serif;
  line-height: 1.65;
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%;  height: auto;}
.wrap { width: min(1200px, calc(100% - 40px)); margin: 0 auto; }
.nav {
  position: sticky; top: 0; z-index: 40;
  background: rgba(251, 252, 251, .92);
  border-bottom: 1px solid var(--line);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; min-height: 68px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); font-weight: 800; }
.brand-mark {
  width: 36px; height: 36px; display: grid; place-items: center;
  border-radius: 10px; color: #fff; background: var(--brand); font-weight: 900;
}
.nav-links { display: flex; gap: 28px; font-weight: 600; font-size: 15px; }
.nav-links a { position: relative; }
.nav-links a::after {
  content: ""; position: absolute; left: 0; bottom: -6px; width: 0; height: 1px;
  background: var(--sage); transition: width .25s ease;
}
.nav-links a:hover { color: var(--brand); }
.nav-links a:hover::after { width: 100%; }
.nav-cta, .btn {
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: 999px; font-weight: 800; cursor: pointer; border: 0;
}
.nav-cta { padding: 10px 20px; color: #fff; background: var(--brand); font-size: 14px; transition: transform .2s ease, background .2s ease; }
.nav-cta:hover { background: var(--sage); transform: translateY(-1px); }
.menu-btn { display: none; border: 0; background: none; font-size: 22px; cursor: pointer; }
.mobile-panel { display: none; flex-direction: column; gap: 12px; padding: 8px 0 16px; font-weight: 600; }
.mobile-panel.open { display: flex; }
.crumb { padding: 14px 0 0; color: var(--muted); font-size: 13px; }
.hero {
  position: relative; min-height: 72vh; padding: 72px 0 0; overflow: hidden;
  color: #fff; text-align: center;
  background: #16382c url("4.webp") center/cover no-repeat;
}
.hero::before {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(15, 36, 28, .72), rgba(15, 36, 28, .48) 48%, rgba(15, 36, 28, .7));
}
.hero-inner { position: relative; z-index: 1; display: flex; flex-direction: column; align-items: center; }
.hero h1 { max-width: 920px; font-size: clamp(26px, 4.6vw, 46px); line-height: 1.22; }
.hero-desc { max-width: 680px; margin-top: 16px; font-size: 17px; color: rgba(255,255,255,.88); }
.hero-cta { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; margin-top: 28px; }
.btn { min-width: 148px; height: 50px; padding: 0 22px; font-size: 16px; transition: transform .2s ease, background .2s ease, border-color .2s ease; }
.btn:hover { transform: translateY(-2px); }
.btn-primary { color: #fff; background: var(--sage); }
.btn-primary:hover { background: #4a9070; }
.btn-ghost { color: #fff; border: 1px solid rgba(255,255,255,.5); background: rgba(255,255,255,.1); }
.btn-line { color: #fff; border: 1px solid rgba(255,255,255,.7); background: transparent; }
.hero-shot { width: min(1100px, 100%); margin-top: 48px; }
.hero-shot img { width: 100%; border-radius: 16px 16px 0 0; }
section { padding: 80px 0; }
.head { max-width: 720px; margin: 0 auto 40px; text-align: center; }
h2 { color: var(--ink); font-size: clamp(26px, 3.4vw, 38px); }
.head p, .copy p, .prose p { margin-top: 12px; color: var(--muted); }
h3 { color: var(--ink); font-size: 20px; }
.gallery { background: var(--soft); }
.hint {
  display: block; margin-bottom: 22px; text-align: center;
  color: var(--muted); font-size: 13px; letter-spacing: .08em;
}
.cards-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.card {
  overflow: hidden; border-radius: 18px; background: #fff;
  border: 1px solid var(--line); cursor: pointer;
  transition: transform .28s ease, box-shadow .28s ease, border-color .28s ease;
}
.card img { width: 100%; height: 168px; object-fit: cover; filter: saturate(.85); transition: filter .3s ease, transform .4s ease; }
.card-body { padding: 16px 18px 20px; }
.card-body p { margin-top: 6px; color: var(--muted); font-size: 13px; }
.tag {
  display: inline-block; margin-top: 10px; padding: 3px 10px; border-radius: 999px;
  color: var(--sage); background: #eef6f1; font-size: 12px; font-weight: 800;
}
.expand {
  max-height: 0; opacity: 0; overflow: hidden;
  transition: max-height .35s ease, opacity .28s ease, margin .28s ease;
}
.expand p { margin: 0; font-size: 13px; color: var(--ink); line-height: 1.7; }
.card:hover, .card.open, .card:focus-within {
  transform: translateY(-6px);
  box-shadow: 0 18px 36px rgba(31, 77, 58, .1);
  border-color: #c8ddd2;
}
.card:hover img, .card.open img, .card:focus-within img {
  filter: saturate(1); transform: scale(1.03);
}
.card:hover .expand, .card.open .expand, .card:focus-within .expand {
  max-height: 88px; opacity: 1; margin-top: 10px;
}
.more { display: block; margin-top: 28px; text-align: center; color: var(--sage); font-weight: 800; }
.zigzag { display: grid; gap: 64px; }
.row { display: grid; grid-template-columns: 1fr 1fr; align-items: center; gap: 48px; }
.row.reverse .media { order: 2; }
.row img {
  width: 100%; height: 320px; object-fit: cover; border-radius: 20px;
  border: 1px solid var(--line); transition: transform .4s ease;
}
.row:hover img { transform: scale(1.02); }
.reveal-list {
  max-height: 0; opacity: 0; overflow: hidden; margin: 0;
  list-style: none; transition: max-height .35s ease, opacity .28s ease, margin .28s ease;
}
.reveal-list li { padding: 4px 0; font-size: 14px; color: var(--ink); }
.reveal-list li::before { content: "· "; color: var(--sage); font-weight: 800; }
.copy:hover .reveal-list, .row:hover .reveal-list, .row.open .reveal-list {
  max-height: 120px; opacity: 1; margin-top: 14px;
}
.text-link {
  display: inline-block; margin-top: 18px; color: var(--sage); font-weight: 800;
  border-bottom: 1px solid transparent; transition: border-color .2s ease;
}
.text-link:hover { border-bottom-color: var(--sage); }
.download { background: linear-gradient(180deg, #fff, var(--soft)); text-align: center; }
.cards-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; margin-top: 40px; text-align: left; }
.dl-card {
  padding: 28px 24px; border-radius: 22px; background: #fff; border: 1px solid var(--line);
  transition: transform .25s ease, border-color .25s ease;
}
.dl-card:hover { transform: translateY(-4px); border-color: var(--sage); }
.dl-card .kicker { color: var(--sage); font-size: 13px; font-weight: 800; }
.dl-card p { margin: 8px 0 18px; color: var(--muted); font-size: 14px; }
.dl-card .btn { width: 100%; height: 46px; color: #fff; background: var(--brand); }
.quotes { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-bottom: 56px; }
.quote { padding: 24px; border-radius: 20px; background: var(--soft); transition: background .25s ease; }
.quote:hover { background: #eaf3ee; }
.quote strong { display: block; margin-top: 14px; color: var(--sage); }
.users { display: grid; grid-template-columns: repeat(5, 1fr); gap: 14px; margin-bottom: 48px; }
.user { padding: 18px 14px; border-radius: 16px; border: 1px solid var(--line); text-align: center; transition: border-color .25s ease; }
.user:hover { border-color: var(--sage); }
.avatar {
  width: 44px; height: 44px; margin: 0 auto; display: grid; place-items: center;
  border-radius: 50%; background: #eef6f1; color: var(--sage); font-weight: 900;
}
.user b { display: block; margin: 10px 0 6px; color: var(--ink); font-size: 14px; }
.user p { color: var(--muted); font-size: 13px; }
.stars { margin-top: 8px; color: #c9a227; font-size: 12px; }
.about {
  display: flex; align-items: center; justify-content: space-between; gap: 32px;
  padding: 36px; border-radius: 28px; background: var(--soft);
}
.pills { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.pills span { padding: 6px 12px; border-radius: 999px; background: #fff; font-size: 13px; font-weight: 700; color: var(--ink); }
.trust-nums { display: flex; gap: 28px; text-align: center; }
.trust-nums strong { display: block; color: var(--ink); font-size: 28px; }
.trust-nums span { color: var(--muted); font-size: 13px; }
footer { padding: 48px 0; background: #13241c; color: rgba(255,255,255,.72); text-align: center; }
footer .name { color: #fff; font-weight: 800; margin-bottom: 14px; }
footer nav { display: flex; justify-content: center; gap: 22px; margin-bottom: 12px; }
footer a:hover { color: #fff; }
@media (max-width: 960px) {
  .nav-links { display: none; }
  .menu-btn { display: block; }
  .cards-4, .cards-3, .quotes { grid-template-columns: 1fr 1fr; }
  .users { grid-template-columns: 1fr 1fr; }
  .row, .row.reverse .media, .about { display: block; }
  .row.reverse .media { order: 0; }
  .row img { height: 200px; margin-bottom: 16px; }
  .about { text-align: center; }
  .trust-nums { justify-content: center; margin-top: 16px; }
  .expand, .reveal-list { max-height: 120px; opacity: 1; margin-top: 10px; }
}
@media (max-width: 640px) {
  .wrap { width: calc(100% - 28px); }
  .hero { padding-top: 48px; min-height: 0; }
  .cards-4, .cards-3, .quotes, .users { grid-template-columns: 1fr; }
}

/* site-perf */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
}
.nav { transform: translateZ(0); }