/* WriteCoach4Kids 官网(视觉规格:docs/双语首页产品与实现方案.md 5.1/5.2) */
:root {
  --ink: #17324D;
  --brand: #2563EB;
  --growth: #16A36A;
  --paper: #FFF9F0;
  --bg: #F7F9FC;
  --card: #FFFFFF;
  --text: #334155;
  --muted: #64748B;
  --border: #E2E8F0;
}

* { box-sizing: border-box; margin: 0; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", Inter, system-ui, sans-serif;
  color: var(--text);
  background: var(--bg);
  font-size: 16px;
  line-height: 1.65;
}
:lang(en) body, html[lang="en"] body { font-family: Inter, system-ui, sans-serif; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.container.narrow { max-width: 720px; }

h1 { color: var(--ink); font-size: 38px; line-height: 1.2; }
h2 { color: var(--ink); font-size: 30px; line-height: 1.27; margin-bottom: 24px; }
h3 { color: var(--ink); font-size: 20px; margin-bottom: 8px; }
@media (min-width: 1024px) {
  h1 { font-size: 56px; line-height: 64px; }
  h2 { font-size: 40px; line-height: 48px; }
  body { font-size: 18px; line-height: 30px; }
}

a { color: var(--brand); text-decoration: none; }
a:focus-visible, .btn:focus-visible { outline: 3px solid var(--brand); outline-offset: 2px; }

.btn {
  display: inline-block; min-height: 48px; padding: 12px 24px; border-radius: 12px;
  font-weight: 600; text-align: center; border: 1px solid transparent;
}
.btn-primary { background: var(--brand); color: #fff; }
.btn-primary:hover { background: #1d4fd7; }
.btn-ghost { border-color: var(--border); color: var(--ink); background: var(--card); }
.btn-lg { padding: 14px 32px; font-size: 18px; }

/* Nav */
.nav { position: sticky; top: 0; background: rgba(255,255,255,.95); border-bottom: 1px solid var(--border); z-index: 10; }
.nav-inner { display: flex; align-items: center; gap: 24px; padding-top: 12px; padding-bottom: 12px; flex-wrap: wrap; }
.brand { font-weight: 700; color: var(--ink); font-size: 18px; }
.nav-links { display: flex; gap: 20px; flex-wrap: wrap; }
.nav-links a { color: var(--text); }
.nav-actions { margin-left: auto; display: flex; gap: 12px; align-items: center; }
.lang-switch { color: var(--muted); font-weight: 600; }

/* Sections */
.section { padding: 56px 0; }
@media (min-width: 640px) { .section { padding: 72px 0; } }
@media (min-width: 1024px) { .section { padding: 96px 0; } }
.section-alt { background: var(--card); }

.hero { background: var(--paper); padding: 64px 0 72px; }
.eyebrow { color: var(--brand); font-weight: 600; letter-spacing: .02em; margin-bottom: 12px; }
.lead { font-size: 18px; max-width: 720px; margin: 16px 0; }
.value-line { color: var(--ink); font-weight: 600; margin-bottom: 24px; }
.cta-row { display: flex; gap: 16px; flex-wrap: wrap; margin: 24px 0 12px; }
.microcopy, .note, .disclaimer, .effective { color: var(--muted); font-size: 14px; margin-top: 12px; }

.trust { background: var(--card); border-bottom: 1px solid var(--border); }
.trust-bar { display: flex; flex-wrap: wrap; gap: 16px 32px; list-style: none; padding: 20px 0; }
.trust-bar li { color: var(--ink); font-weight: 600; }
.trust-bar li::before { content: "✓ "; color: var(--growth); }

.grid { display: grid; gap: 20px; margin: 32px 0; }
@media (min-width: 640px) { .grid-4, .grid-3 { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(4, 1fr); }
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
}

.card {
  background: var(--card); border: 1px solid var(--border); border-radius: 16px;
  padding: 24px; box-shadow: 0 1px 3px rgba(23,50,77,.06);
}
.step-label {
  display: inline-flex; width: 40px; height: 40px; border-radius: 50%;
  background: var(--brand); color: #fff; align-items: center; justify-content: center;
  font-weight: 700; margin-bottom: 12px;
}
.audience-card ul { padding-left: 20px; margin-bottom: 16px; }

.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; background: var(--card); border-radius: 16px; }
th, td { padding: 14px 16px; border: 1px solid var(--border); text-align: left; }
thead th { background: var(--ink); color: #fff; }
tbody th { background: var(--bg); color: var(--ink); }

.price-card { position: relative; display: flex; flex-direction: column; }
.price-card ul { padding-left: 20px; flex: 1; margin: 12px 0 20px; }
.price-card-featured { border-color: var(--brand); border-width: 2px; }
.badge {
  position: absolute; top: -12px; left: 24px; background: var(--growth); color: #fff;
  padding: 2px 12px; border-radius: 999px; font-size: 13px; font-weight: 600;
}
.price { font-size: 40px; color: var(--ink); font-weight: 700; }
.price .period { font-size: 16px; color: var(--muted); font-weight: 400; }
.intro-price { color: var(--growth); font-weight: 600; }

details { border-bottom: 1px solid var(--border); padding: 14px 0; }
summary { cursor: pointer; color: var(--ink); font-weight: 600; }
details p { margin-top: 10px; }

.final-cta { text-align: center; background: var(--paper); }

.footer { background: var(--ink); color: #cbd5e1; padding: 48px 0; }
.footer-groups { display: grid; gap: 24px; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); }
.footer-group h4 { color: #fff; margin-bottom: 12px; }
.footer-group a { display: block; color: #cbd5e1; margin-bottom: 8px; }
.footer-note { margin-top: 32px; font-size: 14px; color: #94a3b8; }

.legal h1 { margin-bottom: 8px; }
.legal h2 { font-size: 22px; margin: 28px 0 8px; }