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

:root {
  --primary: #1b7cf2;
  --primary-dark: #0f5fc4;
  --success: #15b374;
  --warning: #f59e0b;
  --danger: #ef4444;
  --sidebar-bg: #0d1b34;
  --sidebar-active: #1b7cf2;
  --text-main: #1f2937;
  --text-sub: #6b7280;
  --border: #e5e7eb;
  --bg: #f3f5f9;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text-main);
  font-size: 14px;
}

/* ========== 登录页 ========== */
.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #1b7cf2 0%, #0d4fa0 100%);
}
.login-card {
  background: #fff;
  border-radius: 16px;
  padding: 40px 36px;
  width: 380px;
  box-shadow: 0 20px 60px rgba(0,0,0,.25);
}
.login-logo { text-align: center; margin-bottom: 28px; }
.login-icon { font-size: 48px; margin-bottom: 8px; }
.login-logo h1 { font-size: 24px; color: var(--text-main); }
.login-logo p { color: var(--text-sub); margin-top: 6px; font-size: 13px; }
.login-error {
  color: var(--danger);
  background: #fef2f2;
  border: 1px solid #fecaca;
  padding: 8px 12px;
  border-radius: 8px;
  margin-bottom: 14px;
  font-size: 13px;
}
.login-tip { text-align: center; color: #9ca3af; font-size: 12px; margin-top: 16px; }

/* ========== 表单 ========== */
.form-group { margin-bottom: 16px; }
.form-group label { display: block; margin-bottom: 6px; color: var(--text-main); font-weight: 500; }
.form-group input, .form-group select {
  width: 100%;
  height: 40px;
  padding: 0 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  outline: none;
  transition: border-color .2s;
}
.form-group input:focus, .form-group select:focus { border-color: var(--primary); }

/* ========== 按钮 ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  height: 36px;
  padding: 0 16px;
  border: none;
  border-radius: 8px;
  font-size: 14px;
  cursor: pointer;
  background: #f3f4f6;
  color: var(--text-main);
  transition: all .2s;
  text-decoration: none;
}
.btn:hover { opacity: .88; }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-success { background: var(--success); color: #fff; }
.btn-warning { background: var(--warning); color: #fff; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-default { background: #f3f4f6; color: var(--text-main); border: 1px solid var(--border); }
.btn-block { width: 100%; height: 44px; font-size: 15px; }
.btn-sm { height: 30px; padding: 0 12px; font-size: 13px; }
.btn-xs { height: 26px; padding: 0 10px; font-size: 12px; border-radius: 6px; }

/* ========== 后台布局 ========== */
.admin-layout { display: flex; min-height: 100vh; }

.sidebar {
  width: 220px;
  background: var(--sidebar-bg);
  color: #cbd5e1;
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0; bottom: 0; left: 0;
  transition: width .2s;
  z-index: 100;
}
.sidebar.collapsed { width: 64px; }
.sidebar-logo {
  height: 60px;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 20px;
  color: #fff;
  font-size: 16px;
  font-weight: 600;
  border-bottom: 1px solid rgba(255,255,255,.08);
  white-space: nowrap;
  overflow: hidden;
}
.logo-icon { font-size: 24px; }
.sidebar-menu { flex: 1; padding: 12px 0; }
.menu-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 13px 20px;
  cursor: pointer;
  color: #94a3b8;
  transition: all .2s;
  white-space: nowrap;
}
.menu-item:hover { background: rgba(255,255,255,.06); color: #fff; }
.menu-item.active { background: var(--sidebar-active); color: #fff; }
.menu-icon { font-size: 18px; width: 24px; text-align: center; }

.main-area { flex: 1; margin-left: 220px; transition: margin-left .2s; display: flex; flex-direction: column; min-width: 0; }
.sidebar.collapsed ~ .main-area { margin-left: 64px; }

.topbar {
  height: 60px;
  background: #fff;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 24px;
  gap: 16px;
  position: sticky;
  top: 0;
  z-index: 50;
}
.collapse-btn {
  background: none;
  border: none;
  font-size: 20px;
  cursor: pointer;
  color: var(--text-sub);
  padding: 4px 8px;
}
.topbar-title { font-size: 17px; font-weight: 600; flex: 1; }
.topbar-right { display: flex; align-items: center; gap: 14px; }
.admin-name { color: var(--text-sub); font-size: 13px; }

.content { padding: 24px; flex: 1; }

/* ========== 统计卡片 ========== */
.stat-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
  margin-bottom: 20px;
}
.stat-card {
  background: #fff;
  border-radius: 12px;
  padding: 20px;
  display: flex;
  align-items: center;
  gap: 16px;
  box-shadow: 0 1px 3px rgba(0,0,0,.06);
  border-left: 4px solid var(--primary);
}
.stat-blue { border-left-color: var(--primary); }
.stat-green { border-left-color: var(--success); }
.stat-orange { border-left-color: var(--warning); }
.stat-purple { border-left-color: #8b5cf6; }
.stat-icon { font-size: 36px; }
.stat-label { color: var(--text-sub); font-size: 13px; margin-bottom: 6px; }
.stat-value { font-size: 30px; font-weight: 700; color: var(--text-main); line-height: 1.1; }
.stat-value.warning { color: var(--danger); }
.stat-sub { color: var(--text-sub); font-size: 12px; margin-top: 4px; }

/* ========== 面板 ========== */
.panel {
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 1px 3px rgba(0,0,0,.06);
  margin-bottom: 20px;
  overflow: hidden;
}
.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
  gap: 10px;
}
.panel-header h3 { font-size: 15px; }
.panel-body { padding: 20px; }

/* ========== 表格 ========== */
.data-table { width: 100%; border-collapse: collapse; }
.data-table th {
  text-align: left;
  padding: 11px 12px;
  background: #f8fafc;
  color: var(--text-sub);
  font-weight: 500;
  font-size: 13px;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}
.data-table td {
  padding: 11px 12px;
  border-bottom: 1px solid #f1f5f9;
  font-size: 13px;
}
.data-table tr:hover td { background: #f8fafc; }
.empty-tip { text-align: center; color: #9ca3af; padding: 36px 0 !important; }
.import-tip {
  background: #eff6ff;
  border: 1px solid #bfdbfe;
  color: #1e40af;
  border-radius: 8px;
  padding: 10px 14px;
  font-size: 13px;
  margin-bottom: 14px;
  line-height: 1.7;
}

.text-success { color: var(--success); font-weight: 600; }
.text-danger { color: var(--danger); font-weight: 600; }

.tag {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 20px;
  font-size: 12px;
}
.tag-stock { background: #dcfce7; color: #15803d; }
.tag-initial { background: #dbeafe; color: #1d4ed8; }
.tag-consume { background: #fef3c7; color: #b45309; }

/* ========== 工具栏 / 分页 ========== */
.toolbar { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.input-search, .input-select {
  height: 32px;
  padding: 0 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 13px;
  outline: none;
}
.input-search:focus, .input-select:focus { border-color: var(--primary); }
.input-search { width: 220px; }
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  margin-top: 16px;
  color: var(--text-sub);
  font-size: 13px;
}

/* ========== 库存操作 ========== */
.stock-actions { display: flex; align-items: center; gap: 28px; flex-wrap: wrap; }
.stock-now { font-size: 15px; }
.big-stock { font-size: 32px; font-weight: 700; color: var(--primary); margin: 0 4px; }
.big-stock.warning { color: var(--danger); }
.stock-op-row { display: flex; gap: 10px; align-items: center; }
.input-num {
  width: 130px;
  height: 38px;
  padding: 0 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  outline: none;
}

/* ========== 设置 ========== */
.settings-form { max-width: 420px; }
.settings-tip { color: var(--text-sub); margin-bottom: 14px; }
.system-info p { color: var(--text-sub); line-height: 2; }

/* ========== 弹窗 ========== */
.modal-mask {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.45);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
}
.modal {
  background: #fff;
  border-radius: 12px;
  width: 440px;
  max-width: 92vw;
  max-height: 88vh;
  overflow-y: auto;
}
.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
}
.modal-header h3 { font-size: 16px; }
.modal-close {
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  color: var(--text-sub);
  line-height: 1;
}
.modal-body { padding: 20px; }
.modal-footer {
  padding: 14px 20px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: flex-end;
  gap: 10px;
}

/* ========== 提示 ========== */
.toast {
  position: fixed;
  top: 24px;
  left: 50%;
  transform: translateX(-50%);
  padding: 10px 22px;
  border-radius: 8px;
  color: #fff;
  font-size: 14px;
  z-index: 300;
  box-shadow: 0 6px 20px rgba(0,0,0,.18);
  animation: toastIn .25s ease;
}
.toast-success { background: var(--success); }
.toast-error { background: var(--danger); }
.toast-info { background: #374151; }
@keyframes toastIn {
  from { opacity: 0; transform: translate(-50%, -10px); }
  to { opacity: 1; transform: translate(-50%, 0); }
}

@media (max-width: 768px) {
  .sidebar { width: 64px; }
  .main-area { margin-left: 64px; }
  .content { padding: 14px; }
}