:root {
  --blue: #7ec8e3;
  --blue-dark: #277899;
  --cream: #fff2bf;
  --orange: #ffb36b;
  --orange-dark: #d96d2a;
  --ink: #243447;
  --muted: #65758a;
  --paper: #ffffff;
  --soft: #f7fbff;
  --line: #e2edf7;
  --shadow: 0 16px 45px rgba(62, 115, 145, .14);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
  color: var(--ink);
  background: linear-gradient(180deg, #f7fcff 0%, #fff9e8 44%, #ffffff 100%);
  line-height: 1.72;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
.container { width: min(1180px, calc(100% - 36px)); margin: 0 auto; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  background: rgba(255, 255, 255, .88);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
.nav-wrap {
  min-height: 74px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 22px;
}
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; }
.brand-mark {
  width: 42px;
  height: 42px;
  border-radius: 16px;
  display: grid;
  place-items: center;
  color: #fff;
  background: linear-gradient(135deg, var(--blue), var(--orange));
  box-shadow: 0 10px 24px rgba(255, 179, 107, .35);
}
.brand-text { font-size: 20px; letter-spacing: .5px; }
.main-nav { display: flex; align-items: center; gap: 4px; }
.main-nav a {
  padding: 10px 14px;
  border-radius: 999px;
  color: #496276;
  font-size: 15px;
}
.main-nav a:hover, .main-nav a.active { color: #134e65; background: #eaf7fc; }
.menu-toggle {
  display: none;
  border: 0;
  background: #eaf7fc;
  color: #24556d;
  border-radius: 12px;
  font-size: 24px;
  width: 44px;
  height: 44px;
}

.hero { padding: 74px 0 52px; }
.hero-grid { display: grid; grid-template-columns: 1.06fr .94fr; gap: 42px; align-items: center; }
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  color: #326e83;
  background: #e9f8fd;
  border: 1px solid #cfeefa;
  border-radius: 999px;
  font-weight: 700;
  font-size: 14px;
}
h1, h2, h3 { line-height: 1.24; margin: 0; }
h1 { margin-top: 18px; font-size: clamp(34px, 5vw, 62px); letter-spacing: -1px; }
h2 { font-size: clamp(28px, 3vw, 42px); }
h3 { font-size: 21px; }
p { margin: 0; }
.lead { margin-top: 20px; color: #526a7a; font-size: 18px; max-width: 720px; }
.hero-actions { margin-top: 30px; display: flex; flex-wrap: wrap; gap: 14px; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 48px;
  padding: 12px 20px;
  border-radius: 999px;
  font-weight: 800;
  border: 1px solid transparent;
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary { color: #fff; background: linear-gradient(135deg, var(--orange), #ff8d55); box-shadow: 0 12px 26px rgba(255, 141, 85, .3); }
.btn-soft { color: #23647a; background: #eaf7fc; border-color: #ccecf7; }
.hero-card {
  position: relative;
  border-radius: 34px;
  overflow: hidden;
  background: var(--paper);
  box-shadow: var(--shadow);
  border: 1px solid var(--line);
}
.hero-card img { width: 100%; }
.hero-stats {
  margin-top: 24px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}
.stat {
  padding: 16px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, .72);
  border-radius: 22px;
}
.stat strong { display: block; font-size: 22px; color: var(--blue-dark); }
.stat span { color: var(--muted); font-size: 13px; }

.section { padding: 54px 0; }
.section-soft { background: rgba(234, 247, 252, .55); border-block: 1px solid #e6f2f8; }
.section-head { display: flex; align-items: end; justify-content: space-between; gap: 24px; margin-bottom: 26px; }
.section-head p { color: var(--muted); max-width: 680px; }
.grid { display: grid; gap: 20px; }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.card {
  background: rgba(255, 255, 255, .92);
  border: 1px solid var(--line);
  border-radius: 28px;
  padding: 24px;
  box-shadow: 0 12px 30px rgba(76, 132, 160, .09);
}
.card:hover { box-shadow: var(--shadow); }
.card img { border-radius: 22px; margin-bottom: 18px; background: #f8fcff; }
.card p { color: var(--muted); margin-top: 10px; }
.badges { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.badge {
  display: inline-flex;
  align-items: center;
  padding: 6px 10px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 700;
  color: #3d6576;
  background: #eff9fd;
  border: 1px solid #d3edf7;
}
.badge-warm { color: #8a4a15; background: #fff2dc; border-color: #ffddb7; }

.feature-list { display: grid; gap: 14px; margin-top: 20px; }
.feature-item {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 14px;
  border-radius: 20px;
  background: #fff;
  border: 1px solid var(--line);
}
.feature-icon {
  flex: 0 0 34px;
  width: 34px;
  height: 34px;
  border-radius: 13px;
  display: grid;
  place-items: center;
  background: #fff1d9;
  color: var(--orange-dark);
  font-weight: 800;
}
.split { display: grid; grid-template-columns: .9fr 1.1fr; gap: 34px; align-items: center; }
.page-hero { padding: 58px 0 36px; }
.page-hero .lead { max-width: 860px; }
.breadcrumb { color: var(--muted); margin-bottom: 14px; font-size: 14px; }
.breadcrumb a { color: var(--blue-dark); font-weight: 700; }

.topic-row { display: flex; flex-wrap: wrap; gap: 12px; }
.topic-pill {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 10px 14px;
  color: #506e7c;
  font-weight: 700;
}
.timeline { position: relative; display: grid; gap: 16px; }
.step { display: grid; grid-template-columns: 52px 1fr; gap: 16px; align-items: start; }
.step-num {
  width: 52px;
  height: 52px;
  border-radius: 20px;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, #e9f8fd, #fff0d7);
  border: 1px solid #dcecf4;
  font-weight: 900;
  color: #25657b;
}
.note {
  padding: 18px 20px;
  border-radius: 24px;
  background: #fff9e8;
  border: 1px solid #ffdf9d;
  color: #6f501f;
}
.video-card { position: relative; overflow: hidden; }
.video-card::after {
  content: "▶";
  position: absolute;
  top: 32px;
  right: 32px;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  color: #fff;
  background: rgba(255, 141, 85, .92);
  box-shadow: 0 10px 24px rgba(255, 141, 85, .25);
}
.faq details {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 18px 20px;
}
.faq details + details { margin-top: 12px; }
.faq summary { cursor: pointer; font-weight: 800; }
.faq p { color: var(--muted); margin-top: 10px; }
.form-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.form-field { display: grid; gap: 8px; }
.form-field.full { grid-column: 1 / -1; }
label { font-weight: 800; color: #38586a; }
input, select, textarea {
  width: 100%;
  min-height: 48px;
  border: 1px solid #d7e7ef;
  border-radius: 16px;
  padding: 12px 14px;
  font: inherit;
  background: #fff;
  color: var(--ink);
}
textarea { min-height: 130px; resize: vertical; }
.small-text { color: var(--muted); font-size: 14px; }
.site-footer {
  margin-top: 42px;
  padding: 38px 0;
  background: #244557;
  color: #eaf7fc;
}
.footer-grid { display: grid; grid-template-columns: 1.4fr .8fr 1fr; gap: 28px; }
.site-footer p { color: #c7dce5; margin-top: 10px; }
.site-footer a { display: block; color: #eaf7fc; margin-top: 8px; }

@media (max-width: 940px) {
  .menu-toggle { display: grid; place-items: center; }
  .main-nav {
    position: absolute;
    left: 18px;
    right: 18px;
    top: 74px;
    padding: 12px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 24px;
    box-shadow: var(--shadow);
  }
  .main-nav.open { display: flex; }
  .main-nav a { border-radius: 16px; }
  .hero-grid, .split, .footer-grid { grid-template-columns: 1fr; }
  .grid-3, .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 640px) {
  .container { width: min(100% - 26px, 1180px); }
  .hero { padding-top: 42px; }
  .section { padding: 40px 0; }
  .section-head { align-items: flex-start; flex-direction: column; }
  .grid-2, .grid-3, .grid-4, .form-grid, .hero-stats { grid-template-columns: 1fr; }
  .card { padding: 20px; border-radius: 24px; }
  .brand-text { font-size: 18px; }
}