:root {
  --brand: #f6821f;
  --dark: #1a1f2e;
  --text: #3a4152;
  --muted: #6b7385;
  --bg: #ffffff;
  --bg-soft: #f6f7fa;
  --radius: 14px;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
}
a { color: inherit; text-decoration: none; }
.container { max-width: 1120px; margin: 0 auto; padding: 0 24px; }

/* 导航 */
header {
  position: sticky; top: 0; z-index: 10;
  background: rgba(255,255,255,.9);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid #eceef3;
}
.nav { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo { font-weight: 700; font-size: 20px; color: var(--dark); display: flex; align-items: center; gap: 8px; }
.logo span { width: 28px; height: 28px; border-radius: 8px; background: var(--brand); display: inline-block; }
.nav ul { display: flex; gap: 28px; list-style: none; }
.nav ul a { color: var(--muted); font-size: 15px; }
.nav ul a:hover, .nav ul a.active { color: var(--dark); }

/* 按钮 */
.btn {
  display: inline-block; padding: 12px 26px; border-radius: 999px;
  background: var(--brand); color: #fff; font-weight: 600; transition: opacity .2s;
}
.btn:hover { opacity: .88; }
.btn.ghost { background: transparent; color: var(--dark); border: 1px solid #d6d9e0; }

/* 首屏 */
.hero { padding: 110px 0 90px; text-align: center; background: linear-gradient(180deg, #fff7ef 0%, #fff 100%); }
.hero .tag { display: inline-block; font-size: 13px; color: var(--brand); background: #fff0e2; padding: 4px 14px; border-radius: 999px; margin-bottom: 20px; }
.hero h1 { font-size: clamp(32px, 5vw, 54px); color: var(--dark); line-height: 1.2; margin-bottom: 18px; }
.hero p { font-size: 18px; color: var(--muted); max-width: 620px; margin: 0 auto 34px; }
.hero .actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* 区块 */
section { padding: 80px 0; }
section.soft { background: var(--bg-soft); }
.section-title { text-align: center; margin-bottom: 48px; }
.section-title h2 { font-size: 32px; color: var(--dark); margin-bottom: 8px; }
.section-title p { color: var(--muted); }

.grid { display: grid; gap: 24px; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.card { background: #fff; border: 1px solid #eceef3; border-radius: var(--radius); padding: 28px; }
.card .icon { font-size: 28px; margin-bottom: 12px; }
.card h3 { color: var(--dark); margin-bottom: 8px; font-size: 18px; }
.card p { color: var(--muted); font-size: 15px; }

.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 24px; text-align: center; }
.stats strong { display: block; font-size: 40px; color: var(--brand); }
.stats span { color: var(--muted); }

.cta { text-align: center; background: var(--dark); color: #fff; border-radius: 20px; padding: 60px 24px; }
.cta h2 { font-size: 30px; margin-bottom: 12px; }
.cta p { color: #b7bccb; margin-bottom: 28px; }

/* 关于页 */
.page-head { padding: 80px 0 40px; text-align: center; }
.page-head h1 { font-size: 40px; color: var(--dark); }
.page-head p { color: var(--muted); margin-top: 8px; }
.timeline { max-width: 680px; margin: 0 auto; border-left: 2px solid #f1d5bb; padding-left: 28px; }
.timeline div { margin-bottom: 30px; position: relative; }
.timeline div::before { content: ""; position: absolute; left: -36px; top: 8px; width: 14px; height: 14px; border-radius: 50%; background: var(--brand); }
.timeline b { color: var(--dark); }

form { max-width: 560px; margin: 0 auto; display: grid; gap: 14px; }
input, textarea { width: 100%; padding: 12px 14px; border: 1px solid #d6d9e0; border-radius: 10px; font: inherit; }
textarea { min-height: 120px; }

footer { border-top: 1px solid #eceef3; padding: 30px 0; color: var(--muted); font-size: 14px; }
footer .container { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; }

@media (max-width: 640px) {
  .nav ul { gap: 16px; }
  .nav ul li.hide-sm { display: none; }
  .hero { padding: 80px 0 60px; }
}