/* ============ 汪汪星球 设计系统 ============
   品牌: 琥珀橙 #F59E0B · 深蓝 #1E3A8A · 奶油底 #FFF8EF
   圆角: 14-20px · 柔和阴影 · 卡片质感 */
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font-family: -apple-system, "Segoe UI", "Microsoft YaHei", "PingFang SC", sans-serif; color: #1E293B; background: #FFFDF8; line-height: 1.6; }

/* 导航 */
.nav { position: sticky; top: 0; z-index: 100; background: rgba(255,253,248,.85); backdrop-filter: blur(12px); border-bottom: 1px solid #F1E5D0; }
.nav-inner { max-width: 1060px; margin: 0 auto; display: flex; align-items: center; justify-content: space-between; padding: 14px 22px; }
.logo { font-size: 21px; font-weight: 800; letter-spacing: .5px; color: #1E3A8A; }
.nav-links { display: flex; gap: 12px; align-items: center; }
.nav-links a { text-decoration: none; color: #64748B; font-size: 14px; font-weight: 500; transition: color .2s; }
.nav-links a:hover { color: #1E3A8A; }
.btn-primary { background: linear-gradient(135deg, #F59E0B, #F59E0B); color: #fff !important; padding: 9px 18px; border-radius: 999px; text-decoration: none; font-size: 14px; font-weight: 600; box-shadow: 0 4px 14px rgba(245,158,11,.35); transition: transform .15s, box-shadow .2s; }
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 6px 18px rgba(245,158,11,.45); }
.btn-ghost { border: 1.5px solid #E2D5BC; color: #334155 !important; padding: 9px 18px; border-radius: 999px; text-decoration: none; font-size: 14px; font-weight: 500; transition: all .2s; }
.btn-ghost:hover { border-color: #1E3A8A; color: #1E3A8A !important; }

/* Hero */
.hero { background: radial-gradient(1200px 500px at 20% -10%, #3B82F6 0%, #2563EB 45%, #1E3A8A 100%); color: #fff; padding: 100px 22px 80px; position: relative; overflow: hidden; }
.hero::after { content: "🐾"; position: absolute; right: 6%; top: 18%; font-size: 120px; opacity: .12; transform: rotate(-15deg); }
.hero::before { content: "🐕"; position: absolute; left: 5%; bottom: 10%; font-size: 90px; opacity: .1; transform: rotate(12deg); }
.hero-inner { max-width: 820px; margin: 0 auto; text-align: center; position: relative; z-index: 1; }
.hero h1 { font-size: 46px; line-height: 1.25; margin-bottom: 20px; font-weight: 800; letter-spacing: .5px; }
.hero .hl { color: #FBBF24; }
.hero p { font-size: 17px; color: #DBEAFE; line-height: 1.9; max-width: 620px; margin: 0 auto 34px; }
.hero-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.btn-big { background: #F59E0B; color: #1E3A8A; font-weight: 800; padding: 15px 34px; border-radius: 999px; text-decoration: none; font-size: 17px; box-shadow: 0 8px 30px rgba(245,158,11,.4); transition: transform .15s, box-shadow .2s; }
.btn-big:hover { transform: translateY(-2px) scale(1.02); box-shadow: 0 12px 36px rgba(245,158,11,.5); }
.btn-big-ghost { border: 2px solid rgba(255,255,255,.55); color: #fff; padding: 14px 34px; border-radius: 999px; text-decoration: none; font-size: 17px; font-weight: 600; transition: all .2s; }
.btn-big-ghost:hover { background: rgba(255,255,255,.12); border-color: #fff; }
.hero-badges { margin-top: 32px; display: flex; gap: 14px; justify-content: center; font-size: 13.5px; color: #BFDBFE; flex-wrap: wrap; }
.hero-badges span { background: rgba(255,255,255,.1); padding: 6px 16px; border-radius: 999px; backdrop-filter: blur(4px); }

/* 区块 */
.section { max-width: 1060px; margin: 0 auto; padding: 76px 22px; }
.section.dim { background: linear-gradient(#FFFDF8, #FFF3E0); max-width: none; }
.section.dim > h2 { max-width: 1060px; margin: 0 auto 44px; }
.section h2 { text-align: center; font-size: 31px; margin-bottom: 44px; font-weight: 800; letter-spacing: .5px; color: #1E293B; }
.section h2::after { content: ""; display: block; width: 48px; height: 4px; border-radius: 2px; background: #F59E0B; margin: 12px auto 0; }

.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(290px, 1fr)); gap: 22px; }
.card { background: #fff; border: 1px solid #F1E5D0; border-radius: 18px; padding: 28px 26px; box-shadow: 0 8px 30px rgba(30,58,138,.06); transition: transform .2s, box-shadow .2s; }
.card:hover { transform: translateY(-4px); box-shadow: 0 16px 40px rgba(30,58,138,.12); }
.card-icon { font-size: 38px; margin-bottom: 14px; display: inline-block; background: #FFF3E0; width: 64px; height: 64px; line-height: 64px; text-align: center; border-radius: 16px; }
.card h3 { font-size: 18px; margin-bottom: 8px; color: #1E293B; font-weight: 700; }
.card p { color: #64748B; font-size: 14px; line-height: 1.75; }

.how-steps { max-width: 920px; margin: 0 auto; display: flex; gap: 22px; flex-wrap: wrap; justify-content: center; }
.step { flex: 1; min-width: 230px; background: #fff; border-radius: 18px; padding: 26px 22px; text-align: center; border: 1px solid #F1E5D0; box-shadow: 0 8px 30px rgba(30,58,138,.05); }
.step b { display: inline-flex; width: 40px; height: 40px; align-items: center; justify-content: center; background: linear-gradient(135deg, #F59E0B, #FBBF24); color: #fff; border-radius: 50%; font-size: 18px; margin-bottom: 14px; box-shadow: 0 4px 12px rgba(245,158,11,.35); }
.step p { color: #475569; font-size: 14px; line-height: 1.75; }

.download-card { text-align: center; }
.download-card .btn-primary { margin-top: 16px; display: inline-block; }

.footer { background: #0F172A; color: #94A3B8; text-align: center; padding: 32px 20px; font-size: 13px; }

@media (max-width: 640px) {
  .hero h1 { font-size: 30px; }
  .nav-links a:not(.btn-primary):not(.btn-ghost) { display: none; }
  .section h2 { font-size: 24px; }
}

/* ===== v2 动效 ===== */
@keyframes fadeUp { from { opacity: 0; transform: translateY(18px); } to { opacity: 1; transform: none; } }
@keyframes floatDog { 0%,100% { transform: translateY(0) rotate(12deg); } 50% { transform: translateY(-12px) rotate(12deg); } }
.hero-inner { animation: fadeUp .6s ease both; }
.hero-badges { animation: fadeUp .8s .2s ease both; }
.section .card { animation: fadeUp .5s ease both; }
.section .card:nth-child(2) { animation-delay: .06s; }
.section .card:nth-child(3) { animation-delay: .12s; }
.section .card:nth-child(4) { animation-delay: .18s; }
.section .card:nth-child(5) { animation-delay: .24s; }
.section .card:nth-child(6) { animation-delay: .3s; }
.hero::before { animation: floatDog 5s ease-in-out infinite; }
@media (prefers-reduced-motion: reduce) {
  .card, .hero-inner { animation: none; }
}