/* ---------- Reset & base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; -webkit-font-smoothing: antialiased; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
               "Helvetica Neue", Helvetica, Arial, "Microsoft YaHei", sans-serif;
  background: #f6f7fb;
  color: #1a1a29;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
a { color: #3862ff; text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; display: block; }
h1, h2, h3 { line-height: 1.25; color: #0b0b1a; }
h1 { font-size: 2.4rem; margin: 0 0 .3em; }
h2 { font-size: 1.5rem; margin: 1.8em 0 .6em; }
h3 { font-size: 1.15rem; margin: 1.6em 0 .4em; }
p  { margin: .7em 0; }
ul { margin: .7em 0 .7em 1.2em; }
li { margin: .25em 0; }
hr { border: 0; height: 1px; background: #e6e8f2; margin: 2.4em 0; }
code {
  background: #eef0f8; padding: 1px 6px; border-radius: 4px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: .92em;
}

/* ---------- Layout ---------- */
.container { max-width: 780px; margin: 0 auto; padding: 0 24px; }
.site-header {
  background: #fff; border-bottom: 1px solid #e6e8f2;
  padding: 14px 0;
}
.site-header .nav {
  display: flex; align-items: center; justify-content: space-between;
  max-width: 780px; margin: 0 auto; padding: 0 24px;
}
.brand {
  display: flex; align-items: center; gap: 10px;
  font-weight: 700; color: #0b0b1a;
}
.brand .logo {
  width: 32px; height: 32px; border-radius: 8px;
  background: linear-gradient(135deg, #3862ff 0%, #7b4cff 100%);
  display: inline-flex; align-items: center; justify-content: center;
  color: #fff; font-size: 18px;
}
.nav-links a {
  margin-left: 18px; color: #4a4a63; font-weight: 500;
}
.nav-links a.lang { font-size: .9em; }

main { padding: 40px 0 64px; }
.page-card {
  background: #fff;
  border-radius: 16px;
  padding: 40px 44px;
  box-shadow: 0 1px 2px rgba(10, 22, 70, .04),
              0 6px 24px rgba(10, 22, 70, .06);
}
.meta {
  color: #7a7a92; font-size: .92em; margin-bottom: 1.2em;
}

.site-footer {
  text-align: center; padding: 28px 24px 48px;
  color: #7a7a92; font-size: .92em;
}
.site-footer a { color: #7a7a92; margin: 0 8px; }

/* ---------- Landing hero ---------- */
.hero {
  background: linear-gradient(135deg, #3862ff 0%, #7b4cff 100%);
  color: #fff;
  padding: 80px 24px 96px;
  text-align: center;
}
.hero h1 {
  color: #fff; font-size: 3rem; letter-spacing: -.02em;
  margin: 18px 0 12px;
}
.hero p.tagline {
  font-size: 1.25rem; opacity: .92; max-width: 560px; margin: 0 auto 28px;
}
.hero .app-icon {
  width: 112px; height: 112px; border-radius: 26px; margin: 0 auto;
  background: #fff url("icon.png") center/cover no-repeat;
  box-shadow: 0 20px 50px rgba(0,0,0,.18);
}
.cta {
  display: inline-flex; align-items: center; gap: 8px;
  background: #0b0b1a; color: #fff; border-radius: 999px;
  padding: 14px 28px; font-weight: 600; font-size: 1rem;
  box-shadow: 0 8px 22px rgba(0,0,0,.25);
  transition: transform .1s ease;
}
.cta:hover { transform: translateY(-1px); text-decoration: none; color: #fff; }
.cta .chev { opacity: .6; }

.features {
  max-width: 980px; margin: -56px auto 0; padding: 0 24px 80px;
  display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
}
.feature {
  background: #fff; border-radius: 14px; padding: 22px;
  box-shadow: 0 2px 6px rgba(10,22,70,.05);
}
.feature .icon {
  width: 40px; height: 40px; border-radius: 10px;
  background: linear-gradient(135deg, #3862ff 0%, #7b4cff 100%);
  color: #fff; font-size: 20px;
  display: inline-flex; align-items: center; justify-content: center;
  margin-bottom: 14px;
}
.feature h3 { margin: 0 0 6px; font-size: 1.1rem; }
.feature p { margin: 0; color: #4a4a63; font-size: .95rem; }

@media (max-width: 560px) {
  .page-card { padding: 28px 22px; border-radius: 12px; }
  h1 { font-size: 2rem; }
  .hero h1 { font-size: 2.2rem; }
  .hero { padding: 60px 20px 80px; }
  .features { margin-top: -44px; }
}