* { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --brand: #7ad4ff;
  --ink: #1a2230;
  --text: #3d4a5c;
  --muted: #6b7789;
  --line: #d5dde8;
  --chrome1: #eef3f8;
  --chrome2: #c5d0dc;
  --chrome3: #f7fafc;
}
@media (prefers-reduced-motion: no-preference) { html { scroll-behavior: smooth; } }
body {
  color: var(--text);
  background:
    linear-gradient(180deg, #f4f7fb 0%, #e8eef5 40%, #f7fafc 100%);
  font-family: "Trebuchet MS", "Microsoft YaHei", 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: linear-gradient(180deg, rgba(255,255,255,.92), rgba(220,230,240,.88));
  border-bottom: 1px solid rgba(255,255,255,.7);
  box-shadow: 0 1px 0 rgba(160,180,200,.4);
}
.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; letter-spacing: .04em; }
.brand-mark {
  width: 36px; height: 36px; display: grid; place-items: center; border-radius: 50%;
  color: #123; font-weight: 900;
  background: linear-gradient(145deg, #fff, #9eb4c8 45%, #e8f4ff);
  box-shadow: inset 0 1px 0 #fff, 0 2px 8px rgba(80,110,140,.25);
}
.nav-links { display: flex; gap: 28px; font-weight: 700; font-size: 14px; letter-spacing: .06em; text-transform: uppercase; }
.nav-links a:hover { color: #2a6a9a; }
.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: #102030; font-size: 13px; letter-spacing: .04em;
  background: linear-gradient(180deg, #fff, #b8cfe0);
  box-shadow: inset 0 1px 0 #fff, 0 4px 12px rgba(80,120,160,.28);
}
.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: 700; }
.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: #123; text-align: center;
  background:
    radial-gradient(circle at 20% 10%, rgba(255,255,255,.9), transparent 42%),
    radial-gradient(circle at 80% 0%, rgba(180,220,255,.45), transparent 40%),
    linear-gradient(180deg, #d7e3ee, #9eb4c6 55%, #cfd9e4);
}
.hero::after {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image: linear-gradient(rgba(255,255,255,.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.08) 1px, transparent 1px);
  background-size: 28px 28px;
}
.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, 44px); line-height: 1.22; letter-spacing: .02em; }
.hero-desc { max-width: 680px; margin-top: 16px; font-size: 16px; color: #334455; }
.y2k { margin-top: 10px; font-size: 12px; letter-spacing: .28em; text-transform: uppercase; color: #4a6a82; }
.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: 15px; }
.btn-primary {
  color: #102030;
  background: linear-gradient(180deg, #fff, #a8d4f0 55%, #7ab8dc);
  box-shadow: inset 0 1px 0 #fff, 0 8px 20px rgba(80,140,180,.35);
}
.btn-ghost {
  color: #123; border: 1px solid rgba(255,255,255,.7);
  background: linear-gradient(180deg, rgba(255,255,255,.55), rgba(180,200,220,.4));
}
.btn-line { color: #123; border: 1px solid #6a8498; background: transparent; }
.hero-shot { width: min(1100px, 100%); margin-top: 48px; }
.hero-shot img {
  width: 100%; border-radius: 12px 12px 0 0;
  box-shadow: 0 -8px 40px rgba(120,160,200,.35);
  border: 1px solid rgba(255,255,255,.6);
}
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, 36px); letter-spacing: .02em; }
.head p, .copy p { margin-top: 12px; color: var(--muted); }
h3 { color: var(--ink); font-size: 20px; }
.gallery { background: linear-gradient(180deg, #eef3f8, #f7fafc); }
.cards-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.card {
  overflow: hidden; border-radius: 14px;
  background: linear-gradient(180deg, #fff, #e8eef4);
  border: 1px solid #fff;
  box-shadow: 0 10px 24px rgba(120,140,160,.12);
}
.card img { width: 100%; height: 168px; object-fit: cover; }
.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: #2a5a7a; background: #e4f1fa; font-size: 11px; font-weight: 800; letter-spacing: .06em;
}
.more { display: block; margin-top: 28px; text-align: center; color: #2a6a9a; font-weight: 800; letter-spacing: .08em; }
.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: 14px;
  border: 1px solid #fff; box-shadow: 0 12px 28px rgba(120,140,160,.16);
}
.text-link { display: inline-block; margin-top: 18px; color: #2a6a9a; font-weight: 800; border-bottom: 1px solid #2a6a9a; }
.download { background: linear-gradient(180deg, #f7fafc, #dce6f0); 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: 16px;
  background: linear-gradient(180deg, #fff, #e6eef5);
  border: 1px solid #fff;
  box-shadow: 0 12px 28px rgba(100,130,160,.14);
}
.dl-card .kicker { color: #2a6a9a; font-size: 12px; font-weight: 800; letter-spacing: .14em; }
.dl-card p { margin: 8px 0 18px; color: var(--muted); font-size: 14px; }
.dl-card .btn {
  width: 100%; height: 46px; color: #102030;
  background: linear-gradient(180deg, #fff, #a8d4f0);
}
.quotes { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-bottom: 56px; }
.quote { padding: 24px; border-radius: 14px; background: #eef3f8; }
.quote strong { display: block; margin-top: 14px; color: #2a6a9a; }
.users { display: grid; grid-template-columns: repeat(5, 1fr); gap: 14px; margin-bottom: 48px; }
.user { padding: 18px 14px; border-radius: 14px; border: 1px solid var(--line); text-align: center; background: #fff; }
.avatar {
  width: 44px; height: 44px; margin: 0 auto; display: grid; place-items: center; border-radius: 50%;
  background: linear-gradient(145deg, #fff, #b8d0e4); color: #2a5a7a; 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: 18px;
  background: linear-gradient(180deg, #fff, #e8eef5);
  border: 1px solid #fff;
}
.pills { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.pills span { padding: 6px 12px; border-radius: 999px; background: #e4f1fa; font-size: 12px; font-weight: 700; color: var(--ink); letter-spacing: .04em; }
.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: #1a2430; color: rgba(255,255,255,.68); text-align: center; }
footer .name { color: #fff; font-weight: 800; margin-bottom: 14px; letter-spacing: .12em; }
footer nav { display: flex; justify-content: center; gap: 22px; margin-bottom: 12px; }
footer a:hover { color: var(--brand); }
@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; }
}
@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); }