*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #f0f2f5;
  --card-bg: #fff;
  --primary: #1a56db;
  --primary-hover: #1e40af;
  --danger: #dc2626;
  --danger-hover: #b91c1c;
  --success: #059669;
  --warning: #d97706;
  --text: #1f2937;
  --text-secondary: #6b7280;
  --border: #d1d5db;
  --border-light: #e5e7eb;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(0, 0, 0, .1), 0 1px 2px rgba(0, 0, 0, .06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .1), 0 4px 6px -4px rgba(0, 0, 0, .1);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  padding-bottom: 80px;
  -webkit-tap-highlight-color: transparent;
}

.app-header {
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
  color: #fff;
  padding: 12px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  z-index: 100;
  box-shadow: 0 2px 8px rgba(0, 0, 0, .2);
}

.app-header h1 {
  font-size: 18px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
}

.app-header h1 .icon { font-size: 22px; }

.install-btn {
  background: rgba(255, 255, 255, .15);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, .3);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 13px;
  cursor: pointer;
  display: none;
  align-items: center;
  gap: 4px;
  transition: all .2s;
}

.install-btn:hover { background: rgba(255, 255, 255, .25); }
.install-btn.show { display: flex; }

.tab-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--card-bg);
  display: flex;
  border-top: 1px solid var(--border-light);
  z-index: 100;
  box-shadow: 0 -2px 8px rgba(0, 0, 0, .08);
  padding-bottom: env(safe-area-inset-bottom);
}

.tab-nav button {
  flex: 1;
  padding: 8px 4px;
  border: none;
  background: none;
  color: var(--text-secondary);
  font-size: 11px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  transition: color .2s;
  position: relative;
}

.tab-nav button .tab-icon { font-size: 20px; }
.tab-nav button.active { color: var(--primary); }

.tab-nav button.active::after {
  content: '';
  position: absolute;
  top: 0;
  left: 25%;
  right: 25%;
  height: 2px;
  background: var(--primary);
  border-radius: 0 0 2px 2px;
}

.page { display: none; padding: 16px; max-width: 800px; margin: 0 auto; }
.page.active { display: block; }
.sub-page { display: none; }
.sub-page.active { display: block; }

.sub-tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 16px;
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 4px;
  box-shadow: var(--shadow);
}

.sub-tabs button {
  flex: 1;
  padding: 8px 12px;
  border: none;
  background: none;
  border-radius: 6px;
  font-size: 13px;
  cursor: pointer;
  color: var(--text-secondary);
  transition: all .2s;
}

.sub-tabs button.active { background: var(--primary); color: #fff; }

.card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 12px;
  box-shadow: var(--shadow);
}

.card-title {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 6px;
}

.form-group { margin-bottom: 12px; }

.form-group label {
  display: block;
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 4px;
  font-weight: 500;
}

.form-group input, .form-group select, .form-group textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 14px;
  font-family: inherit;
  color: var(--text);
  background: var(--bg);
  transition: border-color .2s;
  outline: none;
}

.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(26, 86, 219, .1);
}

.form-group textarea { resize: vertical; min-height: 60px; }

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.form-row-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 12px; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 20px;
  border: none;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all .2s;
  font-family: inherit;
}

.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-hover); }
.btn-success { background: var(--success); color: #fff; }
.btn-danger { background: var(--danger); color: #fff; padding: 6px 12px; font-size: 12px; }
.btn-outline { background: transparent; border: 1px solid var(--border); color: var(--text); }
.btn-outline:hover { background: var(--bg); }
.btn-sm { padding: 6px 12px; font-size: 12px; }
.btn-block { width: 100%; }
.btn-icon { width: 36px; height: 36px; padding: 0; border-radius: 50%; }

.action-bar { display: flex; gap: 8px; margin-bottom: 16px; flex-wrap: wrap; }
.search-bar { display: flex; gap: 8px; margin-bottom: 12px; flex-wrap: wrap; }
.search-bar input { flex: 1; min-width: 120px; }

.stat-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 8px;
  margin-top: 12px;
}

.stat-item { text-align: center; padding: 8px; background: var(--bg); border-radius: var(--radius); }
.stat-item .val { font-size: 20px; font-weight: 700; color: var(--primary); }
.stat-item .lbl { font-size: 11px; color: var(--text-secondary); margin-top: 2px; }

table { width: 100%; border-collapse: collapse; font-size: 13px; }

th, td { padding: 8px 6px; text-align: left; border-bottom: 1px solid var(--border-light); }

th {
  background: var(--bg);
  font-weight: 600;
  color: var(--text-secondary);
  font-size: 12px;
  position: sticky;
  top: 0;
}

.table-wrap { overflow-x: auto; }

.record-row { cursor: pointer; transition: background .15s; }
.record-row:hover { background: #f8fafc; }

.serial-section { margin-top: 8px; }

.serial-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px;
  background: var(--bg);
  border-radius: var(--radius);
  margin-bottom: 6px;
}

.serial-row input { flex: 1; min-width: 0; }

.serial-photo {
  width: 48px;
  height: 48px;
  border-radius: 6px;
  object-fit: cover;
  border: 1px solid var(--border);
  cursor: pointer;
  background: #e5e7eb;
}

.serial-photos { display: flex; gap: 4px; flex-wrap: wrap; }

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, .6);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
}

.modal {
  background: var(--card-bg);
  border-radius: 12px;
  padding: 20px;
  width: 100%;
  max-width: 500px;
  max-height: 85vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
}

.modal h3 { font-size: 16px; margin-bottom: 12px; }
.modal-actions { display: flex; gap: 8px; margin-top: 16px; justify-content: flex-end; }

.photo-preview {
  max-width: 100%;
  max-height: 60vh;
  border-radius: var(--radius);
  display: block;
  margin: 0 auto;
}

.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 11px;
  font-weight: 500;
  background: #e0e7ff;
  color: #3730a3;
}

.empty-state { text-align: center; padding: 40px 16px; color: var(--text-secondary); }
.empty-state .icon { font-size: 48px; display: block; margin-bottom: 8px; }

.toast {
  position: fixed;
  top: 16px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 300;
  padding: 10px 20px;
  border-radius: 20px;
  font-size: 13px;
  color: #fff;
  background: #1f2937;
  box-shadow: var(--shadow-lg);
  animation: toastIn .3s ease;
  pointer-events: none;
}

.toast.success { background: var(--success); }
.toast.error { background: var(--danger); }

@keyframes toastIn {
  from { opacity: 0; transform: translateX(-50%) translateY(-10px); }
  to { opacity: 1; transform: translateX(-50%) translateY(0); }
}

.sync-status { display: flex; align-items: center; gap: 6px; font-size: 12px; color: var(--text-secondary); margin-top: 8px; }
.sync-dot { width: 8px; height: 8px; border-radius: 50%; }
.sync-dot.synced { background: var(--success); }
.sync-dot.pending { background: var(--warning); }

.spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin .6s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

@media (max-width: 480px) {
  .form-row, .form-row-3 { grid-template-columns: 1fr; }
  .page { padding: 12px; }
  .card { padding: 12px; }
  th, td { padding: 6px 4px; font-size: 11px; }
}

.camera-btn { position: relative; overflow: hidden; }
.camera-btn input[type=file] { position: absolute; inset: 0; opacity: 0; cursor: pointer; }

.dropdown-wrap { position: relative; }
.dropdown-wrap .dd-list {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  z-index: 50;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 0 0 var(--radius) var(--radius);
  max-height: 180px;
  overflow-y: auto;
  display: none;
  box-shadow: var(--shadow);
}
.dropdown-wrap .dd-list.show { display: block; }
.dropdown-wrap .dd-item {
  padding: 8px 12px;
  font-size: 14px;
  cursor: pointer;
  border-bottom: 1px solid var(--border-light);
}
.dropdown-wrap .dd-item:hover { background: var(--bg); }
.dropdown-wrap .dd-item:last-child { border-bottom: none; }