/* 守位 - 前台样式（响应式） */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif; color: #24324a; background: #fff; line-height: 1.65; }
a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }

.container { width: 100%; max-width: 1080px; margin: 0 auto; padding: 0 20px; }
.muted { color: #7b8aa3; }
.accent { color: #2f6fdb; }

/* 按钮 */
.btn { display: inline-block; padding: 12px 26px; border-radius: 999px; font-size: 15px; font-weight: 600; transition: all .2s; border: none; cursor: pointer; text-align: center; }
.btn-primary { background: #2f6fdb; color: #fff; box-shadow: 0 4px 14px rgba(47,111,219,.28); }
.btn-primary:hover { background: #245bb8; transform: translateY(-1px); }
.btn-primary-alt { background: #17b890; color: #fff; box-shadow: 0 4px 14px rgba(23,184,144,.28); }
.btn-primary-alt:hover { background: #12997a; transform: translateY(-1px); }
.btn-ghost { background: transparent; color: #2f6fdb; border: 1.5px solid #2f6fdb; }
.btn-ghost:hover { background: rgba(47,111,219,.06); }
.btn-sm { padding: 8px 16px; font-size: 13px; }
.btn-lg { padding: 15px 34px; font-size: 16px; }

/* 导航 */
.nav { position: sticky; top: 0; z-index: 50; background: rgba(255,255,255,.92); backdrop-filter: blur(8px); border-bottom: 1px solid #eef2f8; }
.nav-inner { max-width: 1080px; margin: 0 auto; padding: 10px 20px; display: flex; align-items: center; justify-content: space-between; }
.brand { display: flex; align-items: center; gap: 10px; }
.brand-logo { width: 36px; height: 36px; border-radius: 10px; background: linear-gradient(135deg,#2f6fdb,#17b890); color: #fff; font-weight: 700; font-size: 18px; display: flex; align-items: center; justify-content: center; }
.brand-name { font-size: 17px; font-weight: 700; }
.nav-right { display: flex; gap: 10px; align-items: center; }

/* Hero */
.hero { background: linear-gradient(160deg,#f3f8ff 0%, #eaf6ff 60%, #f6fffb 100%); padding: 64px 0 56px; }
.hero-grid { display: grid; grid-template-columns: 1.5fr 1fr; gap: 40px; align-items: center; }
.hero h1 { font-size: 38px; line-height: 1.3; margin-bottom: 18px; }
.hero-desc { font-size: 16px; color: #5b6b85; margin-bottom: 26px; max-width: 560px; }
.hero-btns { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-qr { justify-self: center; text-align: center; }
.hero-qr img { width: 180px; height: 180px; border-radius: 16px; border: 8px solid #fff; box-shadow: 0 8px 26px rgba(31,58,95,.14); }
.qr-placeholder { width: 180px; height: 180px; border-radius: 16px; border: 2px dashed #b9c8de; color: #7b8aa3; display: flex; align-items: center; justify-content: center; flex-direction: column; font-size: 14px; background: #fff; }
.qr-tip { margin-top: 12px; font-size: 13px; color: #7b8aa3; }

/* 通用节 */
.section-title { text-align: center; font-size: 28px; margin-bottom: 8px; }
section { padding: 56px 0; }

/* 卖点 */
.points { background: #fff; }
.points-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; margin-top: 30px; }
.point-card { border: 1px solid #e6edf6; border-radius: 16px; padding: 28px 22px; text-align: center; transition: box-shadow .2s; }
.point-card:hover { box-shadow: 0 10px 30px rgba(31,58,95,.08); }
.point-icon { font-size: 40px; margin-bottom: 14px; }
.point-card h3 { font-size: 18px; margin-bottom: 8px; }
.point-card p { color: #7b8aa3; font-size: 14px; }

/* 下载 + 视频 */
.download-video { background: #f7fafd; }
.dv-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 30px; margin-top: 30px; align-items: center; }
.dv-download h3 { font-size: 22px; margin-bottom: 6px; }
.dv-btns { display: flex; gap: 12px; flex-wrap: wrap; margin: 18px 0; }
.dv-qr { margin-top: 10px; }
.dv-qr img { width: 120px; height: 120px; border-radius: 12px; border: 5px solid #fff; box-shadow: 0 6px 18px rgba(31,58,95,.12); }
.dv-video video, .dv-video iframe { width: 100%; aspect-ratio: 16/9; border-radius: 14px; box-shadow: 0 10px 30px rgba(31,58,95,.14); border: 0; }
.video-placeholder { width: 100%; aspect-ratio: 16/9; border-radius: 14px; border: 2px dashed #b9c8de; background: #fff; display: flex; align-items: center; justify-content: center; flex-direction: column; color: #7b8aa3; font-size: 15px; }
.play-badge { width: 56px; height: 56px; border-radius: 50%; background: #2f6fdb; color: #fff; font-size: 20px; display: flex; align-items: center; justify-content: center; margin-bottom: 12px; }

/* 功能介绍 */
.features { background: #fff; }
.feature-row { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center; margin-top: 42px; }
.feature-row.flip .feature-img { order: 2; }
.feature-img img { width: 100%; border-radius: 16px; box-shadow: 0 10px 30px rgba(31,58,95,.10); }
.feature-img-placeholder { width: 100%; aspect-ratio: 4/3; border-radius: 16px; border: 2px dashed #b9c8de; color: #7b8aa3; display: flex; align-items: center; justify-content: center; flex-direction: column; font-size: 15px; background: #fafcff; }
.feature-text h3 { font-size: 22px; margin-bottom: 10px; }
.feature-text p { color: #5b6b85; font-size: 15px; }

/* CTA */
.cta { background: linear-gradient(135deg,#2f6fdb,#17b890); color: #fff; text-align: center; }
.cta h2 { font-size: 30px; margin-bottom: 10px; }
.cta p { opacity: .9; margin-bottom: 24px; }
.cta .btn-primary { background: #fff; color: #2f6fdb; box-shadow: none; }
.cta .btn-primary-alt { background: rgba(255,255,255,.18); color: #fff; box-shadow: none; }

/* 页脚 */
.footer { background: #10233f; color: #aebbd0; font-size: 13px; padding: 36px 0; text-align: center; }
.footer .compliance { background: rgba(255,255,255,.06); border-radius: 10px; padding: 14px 18px; margin-bottom: 18px; color: #c9d6ea; max-width: 720px; margin-left: auto; margin-right: auto; }
.footer .icp { color: #7f90a8; margin-top: 6px; }

/* 移动端适配 */
@media (max-width: 860px) {
  .hero-grid, .dv-grid, .feature-row { grid-template-columns: 1fr; }
  .feature-row.flip .feature-img { order: 0; }
  .hero { padding: 44px 0 40px; }
  .hero h1 { font-size: 28px; }
  .section-title { font-size: 23px; }
  .points-grid { grid-template-columns: 1fr; }
  .hero-btns .btn, .dv-btns .btn { width: 100%; }
}