/* W2 极简 SaaS 官网（变量取色——任务 G：全部颜色走 --site-* 变量，色板/自定义主色即时切换） */

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background: var(--site-bg); color: var(--site-text); line-height: 1.7; font-size: 16px;
  -webkit-font-smoothing: antialiased; overflow-x: hidden;
}
a { color: var(--site-primary-light); text-decoration: none; transition: opacity .15s; }
a:hover { opacity: .85; }

/* 顶部导航 */
.site-nav { position: sticky; top: 0; z-index: 100; background: var(--site-bg); border-bottom: 1px solid var(--site-line); }
.nav-inner { max-width: 1120px; margin: 0 auto; display: flex; align-items: center; justify-content: space-between; padding: 14px 20px; }
.site-nav .brand { font-size: 20px; font-weight: 800; color: var(--site-text); letter-spacing: .5px; }
.site-nav nav a { margin-left: 26px; font-size: 15px; color: var(--site-text-sub); }
.site-nav nav a.active, .site-nav nav a:hover { color: var(--site-text); }
.site-nav nav a.active { border-bottom: 2px solid var(--site-primary); padding-bottom: 4px; }

/* Hero 横幅 */
.hero { position: relative; min-height: 440px; display: flex; align-items: center; background-size: cover; background-position: center; }
.hero::before { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, rgba(0,0,0,.28), rgba(0,0,0,.46)); }
.hero-inner { position: relative; max-width: 1120px; margin: 0 auto; padding: 60px 20px; width: 100%; }
.hero h1 { font-size: 40px; font-weight: 800; margin-bottom: 14px; }
.hero p { font-size: 18px; color: var(--site-text-sub); margin-bottom: 26px; max-width: 640px; }

/* 按钮 */
.btn-primary { display: inline-block; background: var(--site-primary); color: #fff; padding: 12px 30px; border-radius: 10px; font-weight: 600; border: none; cursor: pointer; font-size: 15px; }
.btn-primary:hover { background: var(--site-primary-deep); opacity: 1; }

/* 分区 */
.section { max-width: 1120px; margin: 0 auto; padding: 64px 20px; }
.section.alt { background: var(--site-card); }
.section h1 { font-size: 32px; margin-bottom: 10px; }
.section h2 { font-size: 26px; margin-bottom: 8px; }
.sec-sub { color: var(--site-text-sub); margin-bottom: 28px; }

/* 卡片 */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 18px; }
.card { background: var(--site-card); border: 1px solid var(--site-line); border-radius: 14px; padding: 26px 22px; transition: transform .15s, border-color .15s; }
.card:hover { transform: translateY(-3px); border-color: var(--site-primary); }
.card h3 { font-size: 18px; margin-bottom: 8px; color: var(--site-text); }
.card p { color: var(--site-text-sub); font-size: 14.5px; }

/* 富文本 */
.rich { color: var(--site-text-sub); max-width: 860px; }
.rich h2, .rich h3 { color: var(--site-text); margin: 18px 0 8px; }
.rich p, .rich ul, .rich ol { margin: 10px 0; }
.rich img { max-width: 100%; border-radius: 10px; }

/* 联系页 */
.contact-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 18px; }
.contact-grid .card { text-align: left; }
#leadForm input, #leadForm textarea {
  width: 100%; margin: 8px 0; padding: 11px 13px; border-radius: 10px; border: 1px solid var(--site-line);
  background: var(--site-bg); color: var(--site-text); font: inherit;
}
#leadForm input:focus, #leadForm textarea:focus { outline: none; border-color: var(--site-primary); }
.form-msg { font-size: 13px; color: var(--site-accent); margin-top: 8px; }

/* 页脚 */
.site-foot { border-top: 1px solid var(--site-line); background: var(--site-bg); }
.foot-inner { max-width: 1120px; margin: 0 auto; padding: 26px 20px; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; color: var(--site-text-sub); font-size: 13.5px; }

/* 移动端 */
@media (max-width: 720px) {
  .site-nav nav a { margin-left: 14px; font-size: 13.5px; }
  .hero { min-height: 320px; }
  .hero h1 { font-size: 28px; }
  .hero p { font-size: 15.5px; }
  .section { padding: 44px 16px; }
  .section h1 { font-size: 26px; }
  .section h2 { font-size: 21px; }
}

/* tpl2 SaaS 变体：大圆角卡片 + 柔和投影 + 亮色 hero 渐变兜底 */
.card { border-radius: 18px; box-shadow: 0 6px 24px rgba(15,23,42,.06); }
.hero { min-height: 480px; background-blend-mode: normal; }
.hero::before { background: linear-gradient(120deg, rgba(14,165,233,.16), rgba(139,92,246,.12)); }
.btn-primary { border-radius: 999px; padding: 13px 34px; }
.site-nav { box-shadow: 0 1px 0 var(--site-line); backdrop-filter: saturate(1.2); }

/* ===== 19.0 P0 止血三件（三模板通用段——变量口径走站点 --site-primary 系，零写死） ===== */
.hero-fallback { background: linear-gradient(135deg, var(--site-primary, #6B4EFF), var(--site-primary-deep, #4A2FCC)); }
.form-msg.ok { color: var(--site-primary, #6B4EFF); font-weight: 600; }
.form-msg.err { color: #b3261e; }