/* 扁平化响应式样式 */
:root{
  --bg:#f5f7fb;
  --card:#ffffff;
  --primary:#4f46e5;
  --muted:#6b7280;
  --accent:#06b6d4;
  --radius:12px;
  --container:1100px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial;
}
*{box-sizing:border-box}
html,body{height:100%;margin:0;background:var(--bg);color:#111}
.container{max-width:var(--container);margin:0 auto;padding:16px}
.site-header{background:linear-gradient(90deg,#fff 0%, #fbfdff 100%);box-shadow:0 1px 0 rgba(0,0,0,0.04)}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:12px 16px}
.logo{margin:0;font-size:1.1rem;color:var(--primary)}
.nav a{margin-left:12px;color:var(--muted);text-decoration:none}
.cart-link{margin-left:12px;color:var(--muted);text-decoration:none;position:relative;padding:6px 8px;border-radius:8px}
.cart-count{background:#ff4d4f;color:#fff;font-size:12px;padding:2px 6px;border-radius:12px;margin-left:6px}
/* header user */
.header-user{display:flex;align-items:center;gap:8px;margin-left:12px}
.header-avatar{width:36px;height:36px;border-radius:50%;overflow:hidden;flex-shrink:0}
.header-avatar img{width:100%;height:100%;object-fit:cover}
.header-username{font-size:0.95rem;color:var(--muted)}

/* user center (mobile-first) */
.user-card{display:flex;gap:12px;align-items:center;padding:14px;border-radius:12px;background:var(--card);box-shadow:0 6px 16px rgba(16,24,40,0.04)}
.user-card .avatar{width:72px;height:72px;border-radius:50%;overflow:hidden;flex-shrink:0}
.user-card .avatar img{width:100%;height:100%;object-fit:cover}
.user-card .meta{flex:1}
.user-card .meta h3{margin:0 0 6px;font-size:1.05rem}
.user-card .meta .small{margin:0}
.user-actions{display:flex;gap:10px;margin-top:12px}
.user-actions .btn{flex:1;padding:10px;border-radius:10px;text-align:center}

.user-edit-card{padding:12px;border-radius:12px;background:var(--card);box-shadow:0 6px 16px rgba(16,24,40,0.04)}
.user-edit-card .row{display:flex;gap:8px;align-items:center}
.user-edit-card .row input[type=file]{display:block}
.user-edit-card .preview{width:80px;height:80px;border-radius:50%;overflow:hidden}
.user-edit-card .preview img{width:100%;height:100%;object-fit:cover}
.user-edit-card .input{width:100%;margin:6px 0}

.recent-orders{margin-top:12px;display:flex;flex-direction:column;gap:8px}
.recent-order{padding:10px;border-radius:10px;background:var(--card);display:flex;justify-content:space-between;align-items:center}

@media(min-width:700px){
  .user-actions{max-width:560px}
}

.user-menu{display:flex;flex-direction:column;gap:8px;margin-top:16px;}
.user-menu-item{display:flex;align-items:center;gap:12px;padding:14px;background:var(--card);border-radius:10px;text-decoration:none;color:inherit;}
.user-menu-item .icon{font-size:1.2rem;}
.user-menu-item .text{flex:1;font-weight:600;}
.user-menu-item .arrow{color:var(--muted);}
.hero{background:linear-gradient(135deg,var(--primary),var(--accent));color:#fff;padding:28px;border-radius:12px;margin:16px 0}
.hero h2{margin:0 0 8px}
.btn{display:inline-block;background:#fff;color:var(--primary);padding:10px 14px;border-radius:10px;text-decoration:none;font-weight:600}
.section{margin:18px 0}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:12px}
.card{background:var(--card);padding:12px;border-radius:10px;box-shadow:0 4px 10px rgba(16,24,40,0.04);display:flex;flex-direction:column}
.card{transition:transform .18s ease, box-shadow .18s ease}
.card:hover{transform:translateY(-6px);box-shadow:0 10px 30px rgba(16,24,40,0.08)}
.product-img{height:140px;border-radius:8px;background:linear-gradient(135deg,#e2e8f0,#fff);display:flex;align-items:center;justify-content:center;font-weight:700;color:#333;overflow:hidden}
.product-img img{width:100%;height:100%;object-fit:cover;border-radius:6px;display:block}
.card h4{margin:10px 0 6px;font-size:1rem}
.price{color:var(--primary);font-weight:700}
.cards-row{display:flex;gap:12px}
.category-card{background:var(--card);flex:1;padding:18px;border-radius:10px;text-align:center;text-decoration:none;color:#111;font-weight:600}
.site-footer{padding:18px 0;color:var(--muted)}
/* product detail */
.product-detail{display:grid;grid-template-columns:1fr;gap:12px}
@media(min-width:800px){
  .product-detail{grid-template-columns:1fr 1fr}
}
.info{padding:12px}
.input{display:block;width:100%;padding:10px;border-radius:8px;border:1px solid #e6eef5;margin-bottom:8px}
.btn-primary{background:var(--primary);color:#fff;padding:10px 14px;border-radius:8px;border:none;cursor:pointer}
.btn-primary:hover{opacity:0.95}
.small{font-size:0.9rem;color:var(--muted)}
.empty{padding:20px;text-align:center;color:var(--muted)}
.toast{position:fixed;left:50%;transform:translateX(-50%);bottom:24px;background:rgba(0,0,0,0.8);color:#fff;padding:10px 14px;border-radius:10px;z-index:9999;opacity:0;transition:opacity .25s ease}
.toast.show{opacity:1}
/* utilities */
.row{display:flex;gap:8px;align-items:center}
.badge{background:#eef2ff;color:var(--primary);padding:6px 8px;border-radius:8px;font-weight:600}

/* product detail enhancements */
.product-detail .info h3{margin-top:0}
.related-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:10px;margin-top:12px}
.related-card{background:var(--card);padding:8px;border-radius:8px;text-decoration:none;color:inherit;display:block}
.meta{color:var(--muted);font-size:0.9rem;margin-top:6px}

/* responsive header tweaks */
@media(max-width:640px){
  .header-inner{padding:10px}
  .nav {display: none;}
  .hero{padding:18px}
}

/* cart styles */
.cart-layout{display:grid;grid-template-columns:1fr;gap:12px}
@media(min-width:900px){
  .cart-layout{grid-template-columns:2fr 360px}
}

/* bottom nav (mobile app style) */
.bottom-nav{position:fixed;left:0;right:0;bottom:0;height:60px;background:#fff;border-top:1px solid #eef2ff;display:flex;justify-content:space-around;align-items:center;padding:6px env(safe-area-inset-left) 8px env(safe-area-inset-right);box-shadow:0 -6px 18px rgba(16,24,40,0.04);z-index:999}
.bottom-item{flex:1;text-align:center;color:var(--muted);text-decoration:none;font-size:12px;padding:6px 4px;display:flex;flex-direction:column;align-items:center}
.bottom-item .icon{font-size:20px;margin-bottom:4px}
.bottom-item.active{color:var(--primary)}
.bottom-item .cart-count{background:#ff4d4f;color:#fff;font-size:11px;padding:2px 6px;border-radius:12px;margin-left:6px}

/* hide top nav on small screens to use bottom nav instead */
@media(max-width:900px){
  .nav{display:none}
}

/* ensure body has bottom padding when bottom nav visible */
@media(max-width:900px){
  body{padding-bottom:76px}
}

/* bottom nav (mobile app style) */
.bottom-nav{position:fixed;left:0;right:0;bottom:0;height:60px;background:#fff;border-top:1px solid #eef2ff;display:flex;justify-content:space-around;align-items:center;padding:6px env(safe-area-inset-left) 8px env(safe-area-inset-right);box-shadow:0 -6px 18px rgba(16,24,40,0.04);z-index:999}
.bottom-item{flex:1;text-align:center;color:var(--muted);text-decoration:none;font-size:12px;padding:6px 4px;display:flex;flex-direction:column;align-items:center}
.bottom-item .icon{font-size:20px;margin-bottom:4px}
.bottom-item.active{color:var(--primary)}
.bottom-item .cart-count{background:#ff4d4f;color:#fff;font-size:11px;padding:2px 6px;border-radius:12px;margin-left:6px}

/* hide top nav on small screens to use bottom nav instead */
@media(max-width:900px){
  .nav{display:none}
}

/* ensure body has bottom padding when bottom nav visible */
@media(max-width:900px){
  body{padding-bottom:76px}
}
.cart-list{display:flex;flex-direction:column;gap:10px}
.cart-item{display:flex;gap:12px;align-items:center;padding:12px;border-radius:10px;background:var(--card);box-shadow:0 6px 16px rgba(16,24,40,0.04)}
.cart-item .thumb{width:84px;height:72px;flex-shrink:0;border-radius:8px;overflow:hidden;background:#f6f8fb;display:flex;align-items:center;justify-content:center}
.cart-item .thumb img{width:100%;height:100%;object-fit:cover}
.cart-item .title{flex:1}
.qty-control{display:inline-flex;align-items:center;border-radius:6px;border:1px solid #e6eef5;overflow:hidden}
.qty-control button{background:transparent;border:0;padding:6px 10px;cursor:pointer}
.qty-control input{width:44px;text-align:center;border-left:1px solid #e6eef5;border-right:1px solid #e6eef5;padding:8px 6px}
.remove-btn{background:transparent;border:0;color:#ff4d4f;cursor:pointer;padding:4px 8px}
.summary{position:relative;padding:12px;border-radius:10px;background:var(--card);box-shadow:0 6px 16px rgba(16,24,40,0.04);display:flex;flex-direction:column;gap:12px}
.summary .line{display:flex;justify-content:space-between;align-items:center}
.summary .total{font-size:1.25rem;font-weight:800;color:var(--primary)}
.empty-cart-cta{display:flex;gap:8px;align-items:center;justify-content:center}