:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #eff6ff;
  --bg: #f4f6fb;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --border: #e5e7eb;
  --success: #16a34a;
  --danger: #dc2626;
  --warn: #d97706;
  --radius: 14px;
  --shadow: 0 6px 24px rgba(15, 23, 42, 0.08);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--primary); text-decoration: none; }

/* 顶部栏 */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 18px;
  background: var(--card);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 50;
}
.topbar .brand { font-weight: 700; font-size: 18px; color: var(--primary); }
.topbar .brand small { color: var(--muted); font-weight: 400; font-size: 12px; margin-left: 6px; }
.topbar .user-box { display: flex; align-items: center; gap: 10px; font-size: 14px; color: var(--muted); }
.topbar .user-box .uid { color: var(--text); font-weight: 600; }

/* 顶栏用户下拉选单（买货 / 卖货 / 交易广场 右上角） */
.dropdown { position: relative; display: inline-block; }
.drop-trigger {
  display: inline-flex; align-items: center; gap: 4px;
  background: transparent; color: var(--text);
  border: 1px solid var(--border); border-radius: 999px;
  padding: 6px 12px; font-size: 14px; cursor: pointer; white-space: nowrap;
}
.drop-trigger:hover { background: #f3f4f6; }
.drop-menu {
  position: absolute; right: 0; top: calc(100% + 8px);
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow);
  min-width: 150px; overflow: hidden; z-index: 60;
}
.drop-menu a {
  display: block; padding: 11px 16px; color: var(--text);
  text-decoration: none; font-size: 14px;
}
.drop-menu a:hover { background: var(--primary-light); }

.container { max-width: 960px; margin: 0 auto; padding: 20px 16px 84px; }

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 18px;
  border: 1px solid transparent;
  border-radius: 10px;
  background: var(--primary);
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all .15s;
  font-family: inherit;
}
.btn:hover { background: var(--primary-dark); }
.btn:disabled { opacity: .55; cursor: not-allowed; }
.btn.secondary { background: #fff; color: var(--primary); border-color: var(--primary); }
.btn.secondary:hover { background: var(--primary-light); }
.btn.ghost { background: transparent; color: var(--muted); border-color: var(--border); }
.btn.ghost:hover { background: #f3f4f6; }
.btn.danger { background: var(--danger); }
.btn.danger:hover { background: #b91c1c; }
.btn.small { padding: 6px 12px; font-size: 13px; border-radius: 8px; }
.btn.block { width: 100%; }

/* 卡片 */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
}
.card + .card { margin-top: 16px; }

/* 首页：我要卖货 / 我要买货 */
.home-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-top: 24px;
}
.home-tile {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 40px 24px;
  text-align: center;
  cursor: pointer;
  transition: transform .15s, box-shadow .15s;
}
.home-tile:hover { transform: translateY(-4px); box-shadow: 0 12px 32px rgba(15,23,42,.14); }
.home-tile .icon { font-size: 48px; }
.home-tile h2 { margin: 12px 0 6px; font-size: 22px; }
.home-tile p { margin: 0; color: var(--muted); font-size: 14px; }
.home-tile.sell { border-top: 4px solid var(--primary); }
.home-tile.buy { border-top: 4px solid var(--success); }

/* 买货 / 卖货页面顶部的入口方块（由交易广场迁移而来） */
.entry-tile { margin: 12px 0 4px; }
.entry-tile .act-hint {
  margin-top: 14px;
  font-size: 13px;
  font-weight: 600;
  color: var(--primary);
}
.entry-tile.buy .act-hint { color: var(--success); }

/* 表单 */
.form-row { margin-bottom: 16px; }
.form-row label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 6px; }
.form-row label .req { color: var(--danger); margin-left: 2px; }
.form-row .hint { font-size: 12px; color: var(--muted); margin-top: 4px; }
input[type="text"], input[type="tel"], input[type="email"], input[type="password"],
select, textarea {
  width: 100%;
  padding: 11px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 15px;
  font-family: inherit;
  background: #fff;
  color: var(--text);
}
input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-light);
}
textarea { resize: vertical; min-height: 80px; }
.field-error { color: var(--danger); font-size: 12px; margin-top: 4px; min-height: 14px; }

/* 个人中心：账号信息行 */
.info-row { display: flex; align-items: center; gap: 10px; padding: 11px 0; border-bottom: 1px solid var(--border); font-size: 14px; }
.info-row:last-child { border-bottom: none; }
.info-row .lbl { color: var(--muted); min-width: 52px; }
.info-row b { font-weight: 600; margin-right: auto; }

/* 两列表单 */
.form-2col { display: grid; grid-template-columns: 1fr 1fr; gap: 0 16px; }

/* 文件上传 */
.file-drop {
  border: 1.5px dashed var(--border);
  border-radius: 10px;
  padding: 18px;
  text-align: center;
  color: var(--muted);
  cursor: pointer;
  transition: border-color .15s, background .15s;
}
.file-drop:hover { border-color: var(--primary); background: var(--primary-light); }
.file-drop.has-file { border-style: solid; border-color: var(--success); color: var(--text); }

/* 商品卡片列表（买货） */
.listing-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.listing-card + .listing-card { margin-top: 12px; }
.listing-card .info .model { font-size: 18px; font-weight: 700; }
.listing-card .info .company { color: var(--muted); font-size: 13px; margin-top: 4px; }
.listing-card .info .time { color: var(--muted); font-size: 12px; margin-top: 2px; }

.tag {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  background: var(--primary-light);
  color: var(--primary);
}
.tag.green { background: #dcfce7; color: var(--success); }
.tag.gray { background: #f3f4f6; color: var(--muted); }
.tag.warn { background: #fef3c7; color: var(--warn); }

/* 介绍人（邀请）展示框：验证码栏位下方自动显示，不可更改 */
.inviter-box {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin: 14px 0 4px;
  padding: 12px 14px;
  background: var(--primary-light);
  border: 1px solid #cfe0ff;
  border-radius: 12px;
}
.inviter-box .inviter-left { display: flex; align-items: center; gap: 8px; }
.inviter-box .inviter-label { color: var(--muted); font-size: 13px; }
.inviter-box .inviter-name { font-weight: 600; font-size: 14px; }

.section-title { font-size: 18px; font-weight: 700; margin: 28px 0 12px; }
.empty { text-align: center; color: var(--muted); padding: 40px 0; }

/* 交易广场：卖单 / 买单 分页 */
.plaza-tabs { display: flex; gap: 8px; margin-bottom: 14px; }
.plaza-tabs button {
  flex: 1; padding: 10px 0; border: 1px solid var(--border); background: var(--card);
  border-radius: 10px; font-size: 15px; font-weight: 600; color: var(--muted); cursor: pointer;
  transition: all .15s ease;
}
.plaza-tabs button.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.plaza-list { min-height: 40px; }
.plaza-pager { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; margin-top: 16px; }
.pg-btn {
  min-width: 34px; padding: 6px 10px; border: 1px solid var(--border); background: var(--card);
  border-radius: 8px; font-size: 13px; color: var(--text); cursor: pointer; transition: all .15s ease;
}
.pg-btn:hover:not(:disabled) { border-color: var(--primary); color: var(--primary); }
.pg-btn.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.pg-btn:disabled { opacity: .45; cursor: not-allowed; }
.pg-ellipsis { color: var(--muted); padding: 0 2px; }
.pg-info { margin-left: auto; font-size: 12px; color: var(--muted); }

/* 登录 */
.auth-wrap { max-width: 420px; margin: 8vh auto 0; }
.auth-tabs { display: flex; gap: 8px; margin-bottom: 18px; }
.auth-tabs button {
  flex: 1; padding: 10px; border: 1px solid var(--border); background: #fff;
  border-radius: 10px; font-size: 15px; cursor: pointer; font-weight: 600; color: var(--muted);
}
.auth-tabs button.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.auth-panel { display: none; }
.auth-panel.active { display: block; }
.otp-row { display: flex; gap: 10px; }
.otp-row input { flex: 1; }
.otp-row button { white-space: nowrap; }
.invite-note {
  background: var(--primary-light); color: var(--primary-dark);
  padding: 8px 12px; border-radius: 8px; font-size: 13px; margin-bottom: 16px;
}

.invite-only {
  background: var(--primary-light); color: var(--primary-dark);
  padding: 18px 16px; border-radius: 10px; font-size: 15px; line-height: 1.7;
  text-align: center; font-weight: 600; border: 1px solid var(--primary);
  margin-bottom: 16px;
}

/* 模态框 */
.wb-modal-overlay {
  position: fixed; inset: 0; background: rgba(15,23,42,.45);
  display: flex; align-items: center; justify-content: center; z-index: 9998; padding: 16px;
}
.wb-modal {
  background: #fff; border-radius: var(--radius); width: 100%; max-width: 520px;
  max-height: 90vh; overflow: auto; box-shadow: 0 20px 60px rgba(0,0,0,.3);
}
.wb-modal-title { font-size: 18px; font-weight: 700; padding: 18px 20px; border-bottom: 1px solid var(--border); }
.wb-modal-body { padding: 20px; }
.wb-modal-actions { padding: 14px 20px; display: flex; gap: 10px; justify-content: flex-end; border-top: 1px solid var(--border); }

/* 底部导航（买货 / 卖货 / 交易广场 / 个人中心） */
.bottom-nav {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  background: #fff;
  border-top: 1px solid var(--border);
  box-shadow: 0 -2px 12px rgba(15, 23, 42, 0.06);
  z-index: 60;
  padding-bottom: env(safe-area-inset-bottom, 0);
}
.bottom-nav a {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  padding: 8px 0 7px;
  color: var(--muted);
  font-size: 12px;
  text-decoration: none;
  border-top: 2px solid transparent;
  -webkit-tap-highlight-color: transparent;
}
.bottom-nav a .nav-icon { font-size: 21px; line-height: 1.1; }
.bottom-nav a .nav-label { line-height: 1; }
.bottom-nav a.active { color: var(--primary); border-top-color: var(--primary); }
.bottom-nav a.active .nav-icon { transform: translateY(-1px); }

/* 响应式 */
@media (max-width: 640px) {
  .home-grid { grid-template-columns: 1fr; }
  .form-2col { grid-template-columns: 1fr; }
  .listing-card { flex-direction: column; align-items: stretch; }
  .listing-card .act { text-align: right; }
  .topbar .brand { font-size: 16px; }
}