:root {
  --primary: #ff4400;
  --primary-light: #fff4f0;
  --primary-dark: #e63e00;
  --danger: #ff2442;
  --warning: #ff8f1f;
  --success: #ff6a00;
  --bg: #f5f5f5;
  --card: #fff;
  --text: #222;
  --text2: #999;
  --text3: #ccc;
  --border: #eee;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 4px rgba(0,0,0,.06);
  --header-h: 52px;
  --tab-h: 52px;
  --safe-bottom: env(safe-area-inset-bottom, 0px);
}

*{margin:0;padding:0;box-sizing:border-box;}
body{
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Helvetica Neue",sans-serif;
  background:var(--bg);color:var(--text);
  max-width:430px;margin:0 auto;min-height:100vh;overflow-x:hidden;
  -webkit-tap-highlight-color:transparent;
  -webkit-font-smoothing:antialiased;
}

/* ── 顶栏（白底闲鱼风） ── */
.header{
  position:fixed;top:0;left:50%;transform:translateX(-50%);
  width:100%;max-width:430px;height:var(--header-h);
  background:var(--card);
  display:flex;align-items:center;justify-content:space-between;
  padding:0 16px;z-index:100;
  border-bottom:1px solid var(--border);
  box-shadow:0 1px 0 rgba(0,0,0,.04);
}
.header-brand{display:flex;flex-direction:column;gap:1px;}
.header h1{font-size:18px;font-weight:700;color:var(--text);line-height:1.2;}
.header-sub{font-size:11px;color:var(--text2);font-weight:400;}
.header-actions{display:flex;gap:10px;align-items:center;}
.header-link{font-size:13px;color:var(--text2);text-decoration:none;}
.role-tag{
  font-size:12px;background:var(--primary-light);color:var(--primary);
  padding:5px 12px;border-radius:16px;cursor:pointer;user-select:none;font-weight:500;
}

/* ── 视图容器 ── */
.view{
  display:none;
  padding:var(--header-h) 12px calc(var(--tab-h) + var(--safe-bottom) + 12px);
  min-height:100vh;
}
.view.active{display:block;}
.view-detail-active{padding-bottom:calc(72px + var(--safe-bottom) + 12px);}
.view-title{font-size:17px;font-weight:700;padding:14px 4px 10px;color:var(--text);}

/* ── 底栏 ── */
.tab-bar{
  position:fixed;bottom:0;left:50%;transform:translateX(-50%);
  width:100%;max-width:430px;
  height:calc(var(--tab-h) + var(--safe-bottom));
  background:var(--card);border-top:1px solid var(--border);
  display:flex;z-index:100;padding-bottom:var(--safe-bottom);
}
.tab-item{
  flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;
  font-size:10px;color:var(--text2);cursor:pointer;user-select:none;gap:2px;
}
.tab-item.active{color:var(--primary);font-weight:600;}
.tab-item .icon{font-size:22px;line-height:1;}

/* ── 卡片 ── */
.card{
  background:var(--card);border-radius:var(--radius);padding:14px;
  margin-bottom:10px;box-shadow:var(--shadow);position:relative;overflow:hidden;
}
.card h3{font-size:16px;margin-bottom:4px;font-weight:600;color:var(--text);}
.card .meta{font-size:12px;color:var(--text2);margin-bottom:6px;}
.card .status-badge{position:absolute;top:10px;right:10px;font-size:11px;padding:3px 10px;border-radius:12px;color:#fff;font-weight:500;}
.status-badge.active{background:var(--primary);}
.status-badge.dealt{background:var(--text2);}
.status-badge.expired{background:var(--text3);}

/* ── 按钮 ── */
.btn{
  display:inline-block;padding:11px 20px;border-radius:22px;font-size:15px;
  border:none;cursor:pointer;font-weight:600;text-align:center;
  transition:opacity .15s;
}
.btn:active{opacity:.85;}
.btn-primary{background:linear-gradient(90deg,var(--primary),#ff6a00);color:#fff;width:100%;}
.btn-outline{border:1px solid var(--border);color:var(--text);background:var(--card);}
.btn-sm{padding:7px 14px;font-size:13px;border-radius:16px;}
.btn-block{display:block;width:100%;}
.btn-ghost{background:transparent;color:var(--text2);border:none;padding:8px;}

/* ── 价格 ── */
.price{font-size:20px;font-weight:700;color:var(--danger);font-family:"DIN Alternate","Helvetica Neue",sans-serif;}
.price.zero,.price.pending{color:var(--text2);font-size:14px;font-weight:500;}
.price-lg{font-size:28px;}
.price.pending{color:var(--text2);font-weight:600;}
.price-unit{font-size:14px;font-weight:600;}
.publish-head{display:flex;align-items:center;gap:4px;padding:14px 4px 10px;}
.publish-head .view-title{padding:0;flex:1;}
.publish-back{
  width:36px;height:36px;border:none;background:transparent;font-size:22px;
  cursor:pointer;color:var(--text);display:flex;align-items:center;justify-content:center;flex-shrink:0;
}

/* ── 标签 ── */
.tag{display:inline-block;font-size:11px;padding:2px 8px;border-radius:4px;margin-right:4px;font-weight:500;}
.tag-campus{background:#f0f0f0;color:#666;}
.tag-condition{background:#fff7e6;color:#d46b08;}
.tag-category{background:var(--primary-light);color:var(--primary);}
.countdown{
  display:inline-block;font-size:11px;color:var(--warning);
  background:#fff7e6;padding:2px 8px;border-radius:10px;font-weight:500;
}

/* ── 表单 ── */
.form-group{margin-bottom:16px;}
.form-group label{display:block;font-size:13px;color:var(--text2);margin-bottom:6px;font-weight:500;}
.form-group input,.form-group select,.form-group textarea{
  width:100%;padding:12px 14px;border:1px solid var(--border);border-radius:var(--radius-sm);
  font-size:15px;outline:none;background:#fafafa;
}
.form-group input:focus,.form-group textarea:focus{border-color:var(--primary);background:#fff;}
.form-group textarea{min-height:88px;resize:vertical;}
.hint{font-size:12px;color:var(--text2);margin-top:4px;line-height:1.5;}

/* ── 广场：搜索 + 筛选标签 ── */
.square-toolbar{margin-bottom:10px;}
.search-wrap{position:relative;margin-bottom:10px;}
.search-input{
  width:100%;padding:10px 14px 10px 36px;border:none;border-radius:20px;
  font-size:14px;background:var(--card);outline:none;box-shadow:var(--shadow);
}
.search-input::placeholder{color:var(--text3);}
.search-icon{
  position:absolute;left:12px;top:50%;transform:translateY(-50%);
  font-size:14px;color:var(--text3);pointer-events:none;
}
.chip-row{display:flex;gap:8px;overflow-x:auto;padding:2px 0 8px;-webkit-overflow-scrolling:touch;scrollbar-width:none;}
.chip-row::-webkit-scrollbar{display:none;}
.chip{
  flex-shrink:0;padding:6px 14px;border-radius:16px;font-size:13px;
  background:var(--card);color:var(--text2);border:1px solid var(--border);cursor:pointer;white-space:nowrap;
  font-family:inherit;-webkit-appearance:none;appearance:none;
  -webkit-tap-highlight-color:transparent;touch-action:manipulation;
}
.chip.active{background:var(--primary-light);color:var(--primary);border-color:#ffcbb3;font-weight:600;}
.square-actions{
  display:flex;align-items:center;justify-content:space-between;
  padding:4px 2px 10px;gap:8px;
}
.square-actions-left{display:flex;align-items:center;gap:8px;flex:1;min-width:0;}
.square-actions-left .view-title{padding:0;font-size:16px;white-space:nowrap;}
.share-square-btn{
  font-size:12px;padding:5px 12px;border-radius:14px;
  border:1px solid #ffcbb3;color:var(--primary);background:var(--primary-light);
  cursor:pointer;white-space:nowrap;font-weight:500;
}
.view-mode-toggle{display:flex;background:var(--card);border-radius:16px;padding:2px;border:1px solid var(--border);flex-shrink:0;}
.mode-btn{padding:5px 12px;font-size:12px;border:none;background:transparent;color:var(--text2);cursor:pointer;border-radius:14px;}
.mode-btn.active{background:var(--primary);color:#fff;font-weight:600;}

/* ── 广场列表：图文网格（默认） ── */
#squareList.grid-mode{display:grid;grid-template-columns:repeat(2,1fr);gap:8px;}
#squareList.grid-mode .item-grid{
  background:var(--card);border-radius:var(--radius);overflow:hidden;
  box-shadow:var(--shadow);cursor:pointer;
}
#squareList.grid-mode .grid-thumb{
  position:relative;width:100%;aspect-ratio:1;background:#f0f0f0;overflow:hidden;
}
#squareList.grid-mode .item-thumb-img{width:100%;height:100%;object-fit:cover;display:block;}
#squareList.grid-mode .item-thumb-fallback{
  width:100%;height:100%;display:flex;align-items:center;justify-content:center;
  font-size:40px;
}
#squareList.grid-mode .grid-thumb .campus-watermark{
  position:absolute;left:6px;bottom:6px;font-size:10px;color:#fff;
  background:rgba(0,0,0,.45);padding:2px 6px;border-radius:4px;max-width:80%;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
#squareList.grid-mode .grid-body{padding:8px 10px 10px;}
#squareList.grid-mode .grid-body h3{
  font-size:13px;margin:0 0 6px;font-weight:500;color:var(--text);
  overflow:hidden;text-overflow:ellipsis;white-space:nowrap;line-height:1.3;
}
#squareList.grid-mode .grid-body .bid-info{display:flex;justify-content:space-between;align-items:center;}
#squareList.grid-mode .grid-body .price{font-size:16px;}
#squareList.grid-mode .grid-body .countdown{font-size:10px;padding:1px 6px;}

/* ── 广场列表：列表模式 ── */
#squareList.list-mode .item-row{
  display:flex;align-items:center;gap:10px;padding:10px;
  background:var(--card);border-radius:var(--radius);margin-bottom:8px;
  box-shadow:var(--shadow);cursor:pointer;
}
#squareList.list-mode .item-row .row-thumb{
  width:88px;height:88px;border-radius:var(--radius-sm);overflow:hidden;flex-shrink:0;background:#f0f0f0;
}
#squareList.list-mode .item-row .row-thumb img{width:100%;height:100%;object-fit:cover;}
#squareList.list-mode .item-row .item-thumb-fallback{width:100%;height:100%;display:flex;align-items:center;justify-content:center;font-size:32px;}
#squareList.list-mode .item-row .row-main{flex:1;min-width:0;}
#squareList.list-mode .item-row h3{font-size:14px;margin:0 0 4px;font-weight:500;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
#squareList.list-mode .item-row .row-meta{font-size:11px;color:var(--text2);margin-bottom:4px;}
#squareList.list-mode .item-row .row-right{text-align:right;flex-shrink:0;}
#squareList.list-mode .item-row .price{font-size:17px;}

/* ── 骨架屏 ── */
.skeleton-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:8px;}
.skeleton-card{background:var(--card);border-radius:var(--radius);overflow:hidden;}
.skeleton-thumb{aspect-ratio:1;background:linear-gradient(90deg,#f0f0f0 25%,#e8e8e8 50%,#f0f0f0 75%);background-size:200% 100%;animation:shimmer 1.2s infinite;}
.skeleton-line{height:12px;border-radius:6px;margin:8px 10px;background:linear-gradient(90deg,#f0f0f0 25%,#e8e8e8 50%,#f0f0f0 75%);background-size:200% 100%;animation:shimmer 1.2s infinite;}
.skeleton-line.short{width:60%;}
@keyframes shimmer{0%{background-position:200% 0}100%{background-position:-200% 0}}

/* ── 空状态 ── */
.empty{padding:48px 24px;text-align:center;color:var(--text2);font-size:14px;}
.empty .icon{font-size:56px;margin-bottom:12px;opacity:.6;}
.empty h4{font-size:16px;color:var(--text);margin-bottom:8px;font-weight:600;}
.empty .btn{margin-top:16px;width:auto;display:inline-block;padding:10px 28px;}

/* ── 详情页 ── */
.detail-topbar{
  display:flex;align-items:center;justify-content:space-between;
  margin:0 -12px 10px;padding:6px 8px;background:var(--card);
  position:sticky;top:var(--header-h);z-index:20;margin-top:-4px;
  border-bottom:1px solid var(--border);
}
.detail-back,.detail-share{
  width:36px;height:36px;border:none;background:transparent;font-size:22px;
  cursor:pointer;color:var(--text);display:flex;align-items:center;justify-content:center;
}
.detail-topbar-title{font-size:16px;font-weight:600;}
.detail-hero{
  width:calc(100% + 24px);margin-left:-12px;background:#f0f0f0;
  aspect-ratio:1;max-height:360px;overflow:hidden;position:relative;
}
.detail-hero img{width:100%;height:100%;object-fit:cover;display:block;}
.detail-hero-fallback{width:100%;height:100%;display:flex;align-items:center;justify-content:center;font-size:64px;}
.detail-price-bar{
  background:var(--card);padding:14px 16px;margin:0 -12px;
  display:flex;align-items:baseline;justify-content:space-between;
  border-bottom:8px solid var(--bg);
}
.detail-body{background:var(--card);margin:0 -12px;padding:14px 16px;}
.detail-body h2{font-size:18px;font-weight:600;margin-bottom:8px;line-height:1.4;}
.detail-tags{margin-bottom:10px;}
.detail-desc{font-size:14px;color:var(--text2);line-height:1.6;margin-bottom:12px;}
.detail-seller{font-size:13px;color:var(--text2);padding:12px 0;border-top:1px solid var(--border);}
.detail-bid-bar{
  position:fixed;bottom:calc(var(--tab-h) + var(--safe-bottom));
  left:50%;transform:translateX(-50%);width:100%;max-width:430px;
  background:var(--card);padding:10px 12px;border-top:1px solid var(--border);
  display:flex;gap:10px;align-items:center;z-index:90;
  box-shadow:0 -2px 10px rgba(0,0,0,.06);
}
.detail-bid-bar input{
  flex:1;padding:10px 14px;border:1px solid var(--border);border-radius:22px;
  font-size:18px;font-weight:700;outline:none;background:#fafafa;
}
.detail-bid-bar .btn{width:auto;padding:10px 24px;white-space:nowrap;flex-shrink:0;}
.detail-section{background:var(--card);margin:8px -12px 0;padding:14px 16px;}
.detail-section h4{font-size:14px;color:var(--text2);margin-bottom:10px;font-weight:500;}
.bid-item{display:flex;justify-content:space-between;padding:8px 0;border-bottom:1px solid var(--border);font-size:13px;}
.bid-item:last-child{border-bottom:none;}
.bid-item .amount{font-weight:600;color:var(--danger);}
.wechat-info{
  background:var(--primary-light);border-radius:var(--radius-sm);
  padding:12px 14px;margin:10px 0;font-size:14px;color:var(--primary);
}

/* ── 图片上传 ── */
.image-upload{margin-bottom:16px;}
.image-upload-box{
  width:100%;aspect-ratio:4/3;max-height:200px;border:2px dashed var(--border);
  border-radius:var(--radius);display:flex;align-items:center;justify-content:center;
  cursor:pointer;background:#fafafa;overflow:hidden;position:relative;
}
.image-upload-box.has-image{border-style:solid;border-color:var(--primary);}
.image-upload-box img{width:100%;height:100%;object-fit:cover;}
.image-upload-placeholder{text-align:center;color:var(--text2);font-size:14px;}
.image-upload-placeholder .upload-icon{font-size:32px;display:block;margin-bottom:6px;color:var(--text3);}
.image-upload-remove{
  position:absolute;top:8px;right:8px;width:28px;height:28px;border-radius:50%;
  background:rgba(0,0,0,.5);color:#fff;border:none;font-size:16px;cursor:pointer;
}

/* ── 登录 ── */
.login-overlay{
  display:none;position:fixed;inset:0;background:var(--bg);
  z-index:300;max-width:430px;margin:0 auto;
}
.login-overlay.show{display:block;}
.login-banner{
  background:linear-gradient(135deg,#ff6a00,#ff4400);
  padding:48px 24px 36px;color:#fff;text-align:center;
}
.login-banner h2{font-size:24px;font-weight:700;margin-bottom:8px;}
.login-banner p{font-size:14px;opacity:.9;}
.login-card{
  background:var(--card);border-radius:16px 16px 0 0;padding:24px 20px;
  margin-top:-16px;min-height:50vh;box-shadow:0 -4px 20px rgba(0,0,0,.06);
}
.login-card h2{font-size:18px;margin-bottom:8px;}
.login-note{font-size:13px;color:var(--text2);margin-bottom:16px;line-height:1.5;}
.login-hint{font-size:12px;color:var(--text2);margin-top:12px;line-height:1.5;text-align:center;}
.login-status{font-size:13px;color:var(--primary);margin-top:12px;text-align:center;}

/* ── 弹窗 ── */
.modal-overlay{display:none;position:fixed;inset:0;background:rgba(0,0,0,.5);z-index:500;justify-content:center;align-items:center;}
.modal-overlay.show{display:flex;}
.modal{background:var(--card);border-radius:16px;padding:24px;width:calc(100% - 48px);max-width:350px;text-align:center;}
.modal h3{font-size:18px;margin-bottom:12px;font-weight:600;}
.modal p{font-size:14px;color:var(--text2);margin-bottom:8px;line-height:1.6;white-space:pre-line;}
.modal .btn{margin-top:16px;}

/* ── 喇叭 / 广告 ── */
.horn-bar{
  display:flex;align-items:flex-start;gap:8px;
  background:var(--primary-light);border-radius:var(--radius-sm);
  padding:10px 12px;margin-bottom:8px;font-size:13px;color:var(--text);line-height:1.5;
}
.horn-icon{font-size:16px;flex-shrink:0;}
.ad-carousel-wrap{margin-bottom:10px;}
.ad-carousel-viewport{overflow:hidden;border-radius:var(--radius-sm);background:#f0f0f0;}
.ad-carousel-slide img{width:100%;height:120px;object-fit:cover;display:block;}
.ad-carousel-dots{display:flex;justify-content:center;gap:6px;margin-top:8px;}
.ad-carousel-dots .dot{width:6px;height:6px;border-radius:50%;background:#ddd;cursor:pointer;}
.ad-carousel-dots .dot.active{background:var(--primary);width:16px;border-radius:3px;}

/* ── FAB 发布 ── */
.fab-publish{
  position:fixed;right:16px;
  bottom:calc(var(--tab-h) + var(--safe-bottom) + 16px);
  z-index:110;display:flex;align-items:center;justify-content:center;
  height:48px;padding:0 20px;border:none;border-radius:24px;
  background:linear-gradient(90deg,var(--primary),#ff6a00);color:#fff;
  box-shadow:0 4px 16px rgba(255,68,0,.4);cursor:pointer;font-weight:600;font-size:15px;gap:6px;
}
.fab-publish:active{transform:scale(.96);}
.fab-publish .fab-icon{font-size:18px;}

/* ── 分享面板 ── */
.share-sheet-overlay,.share-poster-overlay{display:none;position:fixed;inset:0;background:rgba(0,0,0,.5);z-index:550;align-items:flex-end;justify-content:center;}
.share-sheet-overlay.show,.share-poster-overlay.show{display:flex;}
.share-sheet-panel{background:var(--card);border-radius:16px 16px 0 0;width:100%;max-width:430px;padding:20px 16px calc(16px + var(--safe-bottom));animation:shareSlideUp .25s ease;}
.share-poster-overlay{align-items:center;padding:16px;}
.share-poster-box{background:var(--card);border-radius:16px;padding:12px;width:calc(100% - 32px);max-width:400px;max-height:90vh;overflow:auto;text-align:center;}
.share-poster-box img{width:100%;height:auto;border-radius:8px;}
.share-poster-hint{font-size:13px;color:var(--text2);margin:12px 0;line-height:1.5;}
.share-sheet-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px;}
.share-sheet-head h3{font-size:17px;margin:0;font-weight:600;}
.share-sheet-close{border:none;background:transparent;font-size:22px;color:var(--text2);cursor:pointer;}
.share-sheet-btn{display:flex;align-items:flex-start;gap:12px;width:100%;padding:14px;margin-bottom:10px;border:1px solid var(--border);border-radius:12px;background:#fff;cursor:pointer;text-align:left;}
.share-sheet-btn strong{display:block;font-size:15px;margin-bottom:4px;}
.share-sheet-btn small{font-size:12px;color:var(--text2);}
.share-sheet-tip{font-size:12px;color:var(--text2);line-height:1.5;}
@keyframes shareSlideUp{from{transform:translateY(100%)}to{transform:translateY(0)}}

/* ── 批量分享 ── */
.batch-toolbar{display:flex;gap:8px;margin-bottom:12px;}
.my-item-select{display:flex;gap:10px;align-items:flex-start;}
.my-item-select input[type=checkbox]{width:20px;height:20px;margin-top:14px;accent-color:var(--primary);}
.my-item-select .card{flex:1;margin-bottom:0;}

/* ── 弹窗广告 ── */
.popup-ad-overlay{display:none;position:fixed;inset:0;background:rgba(0,0,0,.55);z-index:600;align-items:center;justify-content:center;padding:24px;}
.popup-ad-close{position:absolute;top:8px;right:8px;z-index:2;width:32px;height:32px;border:none;border-radius:50%;background:rgba(0,0,0,.45);color:#fff;font-size:18px;cursor:pointer;}

/* hidden selects for filter state */
.filter-selects{display:none;}