/* ========== RESET & BASE ========== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: #1a2536;
  background: #ffffff;
  line-height: 1.7;
}
a { text-decoration: none; color: inherit; }
img { display: block; max-width: 100%; }
ul { list-style: none; padding: 0; }

/* ========== LAYOUT ========== */
.wrap { width: min(1140px, 92%); margin: 0 auto; }
.wrap--narrow { width: min(800px, 92%); margin: 0 auto; }

/* ========== NAVBAR ========== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: #0f2040;
  box-shadow: 0 1px 0 rgba(255,255,255,0.08);
}
.nav-inner {
  width: min(1140px, 92%);
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 28px;
  padding: 15px 0;
}
.logo { font-weight: 800; font-size: 1.05rem; color: #fff; }
.nav-inner ul { display: flex; gap: 22px; flex: 1; }
.nav-inner ul a { color: rgba(255,255,255,0.75); font-size: 0.93rem; transition: color .2s; }
.nav-inner ul a:hover { color: #fff; }
.nav-cta {
  background: #2b7fff;
  color: #fff;
  padding: 7px 18px;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  white-space: nowrap;
}

/* ========== HERO ========== */
.hero {
  background: linear-gradient(135deg, #0f2040 0%, #1353a0 100%);
  padding: 80px 0 68px;
  text-align: center;
  color: #fff;
}
.hero-inner { width: min(820px, 92%); margin: 0 auto; }
.hero-badge {
  display: inline-block;
  border: 1px solid rgba(255,255,255,0.45);
  border-radius: 999px;
  padding: 5px 14px;
  font-size: 13px;
  color: rgba(255,255,255,0.9);
  margin-bottom: 18px;
}
h1 {
  font-size: clamp(2.1rem, 5vw, 3.2rem);
  line-height: 1.22;
  margin-bottom: 16px;
}
.hero-sub {
  color: rgba(255,255,255,0.82);
  max-width: 640px;
  margin: 0 auto 26px;
  font-size: 1.05rem;
}
.hero-btns { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.btn {
  padding: 12px 24px;
  border-radius: 10px;
  font-weight: 700;
  font-size: 0.97rem;
}
.btn-white { background: #fff; color: #0f2040; }
.btn-outline { border: 1px solid rgba(255,255,255,0.6); color: #fff; }
.hero-stats {
  display: flex;
  justify-content: center;
  gap: 32px;
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid rgba(255,255,255,0.14);
  flex-wrap: wrap;
}
.hero-stats div { text-align: center; }
.hero-stats b { display: block; font-size: 1.4rem; margin-bottom: 2px; }
.hero-stats span { font-size: 0.88rem; color: rgba(255,255,255,0.72); }

/* ========== SECTIONS ========== */
.section { padding: 72px 0; }
.section--white { background: #fff; }
.section--gray { background: #f4f7fb; }
.section--blue { background: linear-gradient(135deg, #1353a0, #0f2040); color: #fff; }

.sec-head { text-align: center; margin-bottom: 42px; }
.sec-head h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); margin-bottom: 10px; }
.sec-head p { color: #5d7490; }
.sec-head.light h2 { color: #fff; }
.sec-head.light p { color: rgba(255,255,255,0.75); }

/* ========== FEAT GRID ========== */
.feat-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.feat-grid article {
  border: 1px solid #dce6f5;
  border-radius: 14px;
  padding: 24px;
  transition: box-shadow .2s;
}
.feat-grid article:hover { box-shadow: 0 8px 28px rgba(19,83,160,0.1); }
.icon { font-size: 1.8rem; margin-bottom: 12px; }
.feat-grid h3 { font-size: 1.07rem; margin-bottom: 8px; }
.feat-grid p { color: #5d7490; font-size: 0.95rem; }

/* ========== STEPS ========== */
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.steps article {
  background: #fff;
  border-radius: 14px;
  padding: 26px 22px;
  border: 1px solid #dce6f5;
}
.step-no {
  display: inline-block;
  background: #1353a0;
  color: #fff;
  font-weight: 800;
  font-size: 0.82rem;
  border-radius: 6px;
  padding: 2px 9px;
  margin-bottom: 12px;
}
.steps h3 { margin-bottom: 8px; }
.steps p { color: #5d7490; font-size: 0.95rem; }

/* ========== CASES ========== */
.cases {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}
.cases article {
  border: 1px solid #dce6f5;
  border-radius: 12px;
  padding: 20px;
}
.cases h3 { margin-bottom: 8px; font-size: 1rem; }
.cases p { color: #5d7490; font-size: 0.93rem; }

/* ========== PLANS ========== */
.plans {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.plans article {
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.18);
  border-radius: 14px;
  padding: 26px;
  position: relative;
}
.plans h3 { font-size: 1.15rem; margin-bottom: 6px; color: #fff; }
.plans > article > p { color: rgba(255,255,255,0.72); margin-bottom: 16px; font-size: 0.93rem; }
.plans ul { padding-left: 18px; list-style: disc; }
.plans ul li { color: rgba(255,255,255,0.8); font-size: 0.93rem; margin-bottom: 5px; }
.plans a { display: inline-block; margin-top: 16px; color: #90c4ff; font-weight: 600; }
.plan--hot { background: rgba(255,255,255,0.15); border-color: rgba(255,255,255,0.5); }
.hot-tag {
  position: absolute;
  top: -13px;
  left: 20px;
  background: #2b7fff;
  color: #fff;
  font-size: 0.78rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 999px;
}

/* ========== FAQ ========== */
.faq { display: flex; flex-direction: column; gap: 10px; }
details {
  background: #f4f7fb;
  border: 1px solid #dce6f5;
  border-radius: 10px;
  padding: 14px 18px;
}
details[open] { background: #fff; }
summary { cursor: pointer; font-weight: 600; font-size: 0.97rem; list-style: none; }
summary::after { content: " +"; float: right; }
details[open] summary::after { content: " −"; }
details p { margin-top: 10px; color: #5d7490; font-size: 0.94rem; }

/* ========== CONTACT ========== */
.contact-wrap {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 40px;
  align-items: center;
}
.contact-info h2 { font-size: 1.8rem; margin-bottom: 12px; }
.contact-info p { color: #4e6478; margin-bottom: 6px; }
.contact-info strong { color: #0f2040; }
.contact-qr { text-align: center; }
.contact-qr img { width: 200px; border-radius: 12px; border: 1px solid #dce6f5; }
figcaption { font-size: 0.88rem; color: #8a9db5; margin-top: 8px; }

/* ========== FOOTER ========== */
.footer {
  background: #0b1827;
  padding: 28px 0;
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}
.footer-brand { font-weight: 700; color: #fff; }
.footer p { color: #8ea6c3; font-size: 0.9rem; }

/* ========== RESPONSIVE ========== */
@media (max-width: 1024px) {
  .feat-grid { grid-template-columns: repeat(2, 1fr); }
  .cases { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 800px) {
  .nav-inner ul { display: none; }
  .feat-grid, .steps, .plans, .cases { grid-template-columns: 1fr; }
  .contact-wrap { grid-template-columns: 1fr; }
  .footer-inner { flex-direction: column; align-items: flex-start; }
}