* { margin: 0; box-sizing: border-box; }
body { font-family: -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif; color: #222; background: #fff; }
.nav { border-bottom: 1px solid #eee; position: sticky; top: 0; background: #fffcc; backdrop-filter: blur(8px); }
.nav-inner { max-width: 1080px; margin: 0 auto; padding: 14px 20px; display: flex; justify-content: space-between; align-items: center; }
.logo { font-weight: 800; font-size: 18px; }
nav a { color: #555; text-decoration: none; margin-left: 20px; font-size: 14px; }
.hero { text-align: center; padding: 72px 20px 56px; }
.hero h1 { font-size: 34px; line-height: 1.4; }
.accent { color: #18a058; }
.sub { color: #666; margin: 18px 0 28px; line-height: 1.8; }
.cta-row { display: flex; gap: 14px; justify-content: center; }
.btn { display: inline-block; padding: 12px 28px; border-radius: 8px; text-decoration: none; font-size: 15px; border: none; cursor: pointer; }
.btn.primary { background: #18a058; color: #fff; }
.btn.primary.block { width: 100%; }
.btn.ghost { background: #f2f3f5; color: #333; }
.btn.small { padding: 8px 14px; font-size: 13px; white-space: nowrap; }
.btn:disabled { opacity: .5; cursor: not-allowed; }
section { max-width: 1080px; margin: 0 auto; padding: 48px 20px; }
section h2 { text-align: center; font-size: 24px; margin-bottom: 28px; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; }
.card { background: #f8f9fa; border-radius: 10px; padding: 22px; }
.card b { display: block; margin-bottom: 8px; }
.card p { color: #666; font-size: 14px; line-height: 1.7; }
.agent-list { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; }
.agent-chip { background: #f0faf5; color: #0e7a43; border: 1px solid #b7e4cd; padding: 6px 14px; border-radius: 999px; font-size: 14px; }
.weak { color: #999; font-size: 12px; text-align: center; margin-top: 14px; }
.landing-card { max-width: 380px; margin: 0 auto; background: #f8f9fa; border-radius: 12px; padding: 26px; }
.form-row { display: flex; gap: 10px; margin-bottom: 12px; }
.form-row input { flex: 1; padding: 11px 14px; border: 1px solid #ddd; border-radius: 8px; font-size: 15px; }
.form-row input:focus { outline: 2px solid #18a05833; border-color: #18a058; }
.inviter { text-align: center; background: #fff7e6; color: #ad6800; border-radius: 8px; padding: 8px; margin-bottom: 14px; font-size: 14px; }
.msg { margin-top: 12px; padding: 10px; border-radius: 8px; font-size: 14px; text-align: center; }
.msg.ok { background: #f0faf5; color: #0e7a43; }
.msg.err { background: #fff1f0; color: #cf1322; }
.footer { text-align: center; padding: 40px 20px 60px; border-top: 1px solid #eee; color: #666; font-size: 14px; }