:root {
  --brand: #1d5693;
  --brand-2: #2f7fd1;
  --tint: #eaf2fb;
  --bg: #ffffff;
  --card: #ffffff;
  --fg: #1b2733;
  --muted: #5d6b7a;
  --border: #dbe5f0;
  --shadow: 0 6px 24px rgb(29 86 147 / 0.1);
}
@media (prefers-color-scheme: dark) {
  :root {
    --brand: #5aa2e8;
    --brand-2: #8ec1f5;
    --tint: #12263b;
    --bg: #0d1722;
    --card: #14222f;
    --fg: #e7eef6;
    --muted: #9db0c3;
    --border: #243648;
    --shadow: 0 6px 24px rgb(0 0 0 / 0.35);
  }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.7 -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
}
[hidden] { display: none !important; }
a { color: var(--brand); text-decoration: none; }
.wrap { max-width: 1040px; margin: 0 auto; padding: 0 20px; }
.muted { color: var(--muted); }
.small { font-size: 13px; }
.center { text-align: center; }

.top {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.bar { display: flex; align-items: center; justify-content: space-between; height: 56px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; color: var(--fg); }
.brand img { border-radius: 8px; }
nav { display: flex; align-items: center; gap: 18px; font-size: 15px; }
nav a { color: var(--fg); }
nav a:hover { color: var(--brand); }
#lang {
  border: 1px solid var(--border); background: transparent; color: var(--fg);
  border-radius: 6px; padding: 2px 10px; cursor: pointer; font: inherit; font-size: 13px;
}
#lang:hover { border-color: var(--brand); color: var(--brand); }

.hero {
  background: linear-gradient(160deg, #1d5693 0%, #2f7fd1 100%);
  color: #fff;
  text-align: center;
  padding: 40px 0 0;
  overflow: hidden;
}
.hero-logo { border-radius: 20px; box-shadow: 0 8px 24px rgb(0 0 0 / 0.25); background: #fff; }
.hero h1 { margin: 20px 0 4px; font-size: 44px; line-height: 1.2; }
.hero h1 small { font-size: 20px; font-weight: 400; opacity: 0.85; margin-left: 6px; }
.slogan { font-size: 22px; margin: 6px 0 8px; }
.hero-in {
  max-width: 1280px; margin: 0 auto; padding: 0 28px;
  display: grid; grid-template-columns: 278px 1fr 187px; gap: 32px; align-items: stretch;
}
.hero-text { align-self: center; padding: 8px 0 24px; }
.shot-cal { display: block; width: 100%; height: auto; align-self: end; filter: drop-shadow(0 14px 28px rgb(0 0 0 / 0.35)); }
.stickies { position: relative; align-self: end; aspect-ratio: 280 / 639; width: 100%; }
.stickies img {
  position: absolute; width: 88%; height: auto;
  filter: drop-shadow(0 10px 20px rgb(0 0 0 / 0.35));
}
.stickies .st1 { top: 0; left: 12%; transform: rotate(4deg); filter: hue-rotate(150deg) drop-shadow(0 10px 20px rgb(0 0 0 / 0.35)); }
.stickies .st2 { top: 30%; left: 0; transform: rotate(-3deg); filter: hue-rotate(-50deg) drop-shadow(0 10px 20px rgb(0 0 0 / 0.35)); }
.stickies .st3 { top: 61%; left: 10%; transform: rotate(2deg); }
.sub { max-width: 560px; margin: 0 auto 28px; opacity: 0.92; }
.cta { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

.btn {
  display: inline-block; padding: 10px 22px; border-radius: 10px; font-weight: 600;
  border: 1px solid var(--brand); color: var(--brand); background: transparent;
}
.btn:hover { background: var(--tint); }
.btn.primary { background: var(--brand); color: #fff; }
.btn.primary:hover { background: var(--brand-2); }
.hero .btn.primary { background: #fff; color: #1d5693; border-color: #fff; }
.hero .btn.primary:hover { background: #eaf2fb; }
.hero .btn.ghost { color: #fff; border-color: rgb(255 255 255 / 0.6); }
.hero .btn.ghost:hover { background: rgb(255 255 255 / 0.12); }
.btn[aria-disabled="true"] { opacity: 0.55; cursor: default; pointer-events: none; border-style: dashed; }

.sec { padding-top: 64px; padding-bottom: 64px; }
h2 { text-align: center; font-size: 30px; margin: 0 0 32px; color: var(--brand); }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 18px; }
.grid.three { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.card {
  background: var(--card); border: 1px solid var(--border); border-radius: 14px;
  padding: 22px; box-shadow: var(--shadow);
}
.card h3 { margin: 8px 0 6px; font-size: 18px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }
.ico { font-size: 30px; line-height: 1; }

.band { background: var(--tint); }
.why h3 { margin: 0 0 6px; color: var(--brand); font-size: 19px; }
.why p { margin: 0; color: var(--fg); }

.dl { margin-bottom: 18px; }
.plat { display: flex; flex-direction: column; align-items: flex-start; gap: 10px; }
.plat h3 { margin: 4px 0 0; }
.plat p { margin: 0; }
.plat .btn { width: 100%; text-align: center; }

footer { border-top: 1px solid var(--border); padding: 22px 0; color: var(--muted); font-size: 14px; }
.foot { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; }

@media (max-width: 640px) {
  nav { gap: 12px; font-size: 14px; }
  nav a:nth-child(2) { display: none; }
  .hero h1 { font-size: 34px; }
  .hero { padding: 32px 0 0; }
}

@media (max-width: 1100px) {
  .hero-in { grid-template-columns: 1fr 0.62fr; gap: 16px; padding: 0 16px; }
  .hero-text { grid-column: 1 / -1; grid-row: 1; }
}