:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --bg: #ffffff;
  --bg-alt: #f1f5f9;
  --text: #1e293b;
  --muted: #64748b;
  --border: #e2e8f0;
  --radius: 14px;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: 'Inter', 'Noto Sans TC', sans-serif;
  color: var(--text); background: var(--bg); line-height: 1.6;
}
.container { max-width: 1080px; margin: 0 auto; padding: 0 20px; }

.nav { border-bottom: 1px solid var(--border); background: #fff; position: sticky; top: 0; z-index: 10; }
.nav-inner { max-width: 1080px; margin: 0 auto; padding: 14px 20px; display: flex; justify-content: space-between; align-items: center; }
.logo { font-weight: 700; font-size: 1.2rem; color: var(--primary); text-decoration: none; }
.nav-links { display: flex; gap: 16px; align-items: center; }
.nav-links a { color: var(--text); text-decoration: none; font-size: .95rem; }
.lang-select { border: 1px solid var(--border); border-radius: 8px; padding: 5px 8px; font-size: .85rem; background: #fff; color: var(--text); cursor: pointer; }

.hero { padding: 90px 0 70px; text-align: center; background: linear-gradient(180deg, #eff6ff 0%, #fff 100%); }
.hero h1 { font-size: 2.6rem; margin-bottom: 16px; }
.hero-sub { color: var(--muted); font-size: 1.15rem; max-width: 640px; margin: 0 auto 28px; }
.hero-actions { margin-bottom: 12px; }
.hero-note { color: var(--muted); font-size: .9rem; }

.section { padding: 64px 0; }
.section-alt { background: var(--bg-alt); }
.section h2 { text-align: center; margin-bottom: 36px; font-size: 1.8rem; }

.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 20px; }
.card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; }
.card-featured { border-color: var(--primary); box-shadow: 0 4px 20px rgba(37,99,235,.12); }
.card h3 { margin-bottom: 8px; font-size: 1.05rem; }
.card p { color: var(--muted); font-size: .92rem; }
.price { font-size: 1.6rem; font-weight: 700; color: var(--primary); margin: 8px 0; }
.price span { font-size: .9rem; color: var(--muted); font-weight: 400; }

.btn-primary, .btn-ghost, .btn-sm, .btn-lg, .btn-danger {
  display: inline-block; border-radius: 10px; cursor: pointer; text-decoration: none; text-align: center;
  font-family: inherit; font-size: .95rem; transition: all .15s;
}
.btn-primary { background: var(--primary); color: #fff; border: none; padding: 10px 22px; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-ghost { background: transparent; color: var(--text); border: 1px solid var(--border); padding: 8px 16px; }
.btn-ghost:hover { border-color: var(--primary); color: var(--primary); }
.btn-sm { padding: 8px 16px; font-size: .88rem; }
.btn-lg { padding: 14px 32px; font-size: 1.05rem; }
.btn-danger { background: #fee2e2; color: #b91c1c; border: none; padding: 8px 16px; }

.footer { padding: 32px 0; color: var(--muted); font-size: .88rem; border-top: 1px solid var(--border); text-align: center; }

/* ---- 定价方案（方案B） ---- */
.pricing-sub { text-align: center; color: var(--muted); margin-top: -12px; margin-bottom: 24px; }
.cards-plans { align-items: stretch; }
.cards-plans .card { display: flex; flex-direction: column; position: relative; padding-top: 34px; }
.cards-plans .card-featured { border-width: 2px; transform: translateY(-6px); }
.plan-badge { position: absolute; top: 12px; left: 50%; transform: translateX(-50%); white-space: nowrap; background: var(--bg-alt); color: var(--primary); font-size: .78rem; font-weight: 700; padding: 3px 12px; border-radius: 999px; }
.badge-hot { background: var(--primary); color: #fff; }
.price-strike { text-decoration: line-through; color: var(--muted); font-size: .9rem; margin-right: 6px; }
.per-note { font-size: .88rem; margin: 0 0 10px; }
.plan-list { list-style: none; padding: 0; margin: 0 0 18px; flex: 1; }
.plan-list li { padding: 5px 0 5px 24px; position: relative; font-size: .92rem; }
.plan-list li::before { content: '✓'; position: absolute; left: 2px; color: var(--primary); font-weight: 700; }
.plan-btn { display: block; text-align: center; }
.plan-limited { font-size: .8rem; color: #b45309; margin: 10px 0 0; text-align: center; }
@media (max-width: 960px) { .cards-plans { grid-template-columns: 1fr 1fr; } .cards-plans .card-featured { transform: none; } }
@media (max-width: 560px) { .cards-plans { grid-template-columns: 1fr; } }