/* ==================== 全局基础样式 ==================== */
:root {
  --primary: #1677ff;
  --primary-dark: #0958d9;
  --primary-light: #e8f3ff;
  --bg: #ffffff;
  --section-bg: #f5f7fa;
  --text: #172033;
  --muted: #667085;
  --border: #cfdff2;
  --shadow: 0 8px 24px rgba(15, 35, 80, 0.07);
  --shadow-hover: 0 16px 38px rgba(22, 119, 255, 0.14);
  --warm: #f1672a;
  --cyan: #35c9ff;
  --radius: 10px;
  --container: 1200px;
  --header-h: 72px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; overflow-x: hidden; }
body {
  min-width: 320px;
  overflow-x: hidden;
  background:
    linear-gradient(180deg, #ffffff 0%, #f7faff 36%, #ffffff 100%);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.6;
}
a { color: inherit; text-decoration: none; }
button { font: inherit; border: 0; cursor: pointer; }
img, svg { max-width: 100%; display: block; }
.container { width: min(100% - 32px, var(--container)); margin: 0 auto; }
.section { padding: 48px 0; position: relative; }
.section::before { content: ""; position: absolute; left: 50%; top: 0; width: min(92%, 1120px); height: 1px; transform: translateX(-50%); background: linear-gradient(90deg, transparent, rgba(22,119,255,.18), transparent); }
.hero + .section { padding-top: 30px; }
.hero + .section::before { display: none; }
.section.alt { background: var(--section-bg); }
.section-title { text-align: center; margin-bottom: 10px; font-size: 36px; line-height: 1.25; font-weight: 800; letter-spacing: -0.02em; }
.section-desc { max-width: 820px; margin: 0 auto 26px; text-align: center; color: var(--muted); font-size: 17px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 44px; padding: 0 26px; border-radius: 999px;
  background: var(--primary); color: #fff; font-weight: 700;
  transition: transform .25s ease, background .25s ease, box-shadow .25s ease;
  box-shadow: 0 8px 20px rgba(22, 119, 255, .22);
  white-space: nowrap;
}
.btn:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 12px 26px rgba(22, 119, 255, .28); }
.mobile .btn:hover { transform: none; }
.mobile .btn:active { transform: scale(.98); background: var(--primary-dark); }