/* Mobile layouts also cover compact landscape phones. Desktop and print stay unchanged. */
.mobile-nav-backdrop { display: none; }

@media screen and (max-width: 720px), screen and (max-width: 900px) and (max-height: 500px) {
  :root { --mobile-nav-height: 76px; }
  html { scroll-padding-bottom: calc(var(--mobile-nav-height) + env(safe-area-inset-bottom) + 20px); }
  .app-shell { display: block; }
  .app-shell > main { min-width: 0; padding-bottom: calc(var(--mobile-nav-height) + env(safe-area-inset-bottom) + 20px); }
  .page-content { padding: 18px 12px 26px; }
  .topbar { position: relative; display: flex; flex-wrap: nowrap; align-items: center; min-height: 70px; padding: 12px 14px; gap: 12px; }
  .topbar > div:first-child { flex: 1 1 auto; min-width: 0; }
  .topbar p { display: none; }
  .topbar h1 { font-size: 22px; line-height: 1.4; }
  .top-actions { flex: 0 0 auto; width: auto; gap: 8px; }
  .top-actions .api-state, .help-button span { display: none; }
  .top-actions .icon-button.todo-button, .top-actions .help-button { width: 44px; height: 44px; min-height: 44px; padding: 0; }
  .sidebar, .sidebar.sidebar-art { position: fixed; inset: auto 0 0; z-index: 40; display: flex; flex-direction: row; align-items: stretch; width: 100%; height: calc(var(--mobile-nav-height) + env(safe-area-inset-bottom)); padding: 5px max(8px, env(safe-area-inset-right)) calc(5px + env(safe-area-inset-bottom)) max(8px, env(safe-area-inset-left)); border-top: 1px solid #ffffff20; overflow: visible; }
  .sidebar .sidebar-tools, .sidebar .brand-mark, .sidebar .brand-copy, .sidebar .sidebar-foot { display: none; }
  .sidebar nav, .sidebar-art nav { display: flex; flex-direction: row; align-items: stretch; justify-content: flex-start; width: 100%; height: 100%; min-height: 0; margin: 0; padding: 0; gap: 4px; overflow-x: auto; overflow-y: hidden; overscroll-behavior-x: contain; scrollbar-width: none; }
  .sidebar nav .nav-group { flex: 0 0 76px; min-width: 0; }
  .sidebar nav .nav-group-toggle, .sidebar.sidebar-art .nav-group-toggle { display: flex; flex-direction: column; justify-content: center; align-items: center; width: 100%; height: 64px; min-height: 44px; padding: 5px 2px; gap: 4px; border-radius: 12px; }
  .sidebar nav .nav-group-icon, .sidebar.sidebar-art .nav-group-icon { width: 28px; height: 28px; font-size: 19px; }
  .sidebar nav .nav-group-toggle strong, .sidebar-art .nav-group-copy strong { display: block; font-size: 11px; line-height: 1.4; letter-spacing: 0; white-space: nowrap; }
  .sidebar.sidebar-art .nav-group-copy { display: block; }
  .sidebar nav .nav-chevron, .sidebar-art .nav-group-copy small { display: none; }
  .sidebar nav .nav-group .nav-submenu { position: fixed; inset: auto 12px calc(var(--mobile-nav-height) + env(safe-area-inset-bottom) + 8px); z-index: 41; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); min-width: 0; max-height: min(360px, 55dvh); overflow-y: auto; margin: 0; padding: 12px; gap: 8px; border: 1px solid #ffffff26; border-radius: 16px; background: #0b2b34; box-shadow: 0 -8px 32px #061c2440; }
  .sidebar nav .nav-group .nav-subitem { justify-content: flex-start; width: 100%; height: auto; min-height: 48px; padding: 10px 12px; font-size: 14px; background: #ffffff08; }
  .sidebar nav .nav-group .nav-subitem > .nav-item-label { display: inline; min-width: 0; width: auto; font-size: 14px; line-height: 1.5; }
  .sidebar nav .nav-group .nav-subitem > span:first-child { flex-shrink: 0; }
  .sidebar nav .nav-subitem.active::before { display: none; }
  .sidebar nav .nav-subitem em { display: grid; margin-left: auto; }
  .mobile-nav-backdrop { display: block; position: fixed; inset: 0 0 calc(var(--mobile-nav-height) + env(safe-area-inset-bottom)); z-index: 35; width: 100%; min-height: 0; border: 0; padding: 0; background: #071e2940; }
  .mobile-nav-backdrop:hover { transform: none; }

  .intro-row { gap: 14px; margin-bottom: 18px; }
  .intro-row h2, .module-hero h2 { font-size: 26px; line-height: 1.4; }
  .intro-row p, .module-hero p { font-size: 14px; line-height: 1.7; }
  .today-card { flex-basis: 100%; width: 100%; padding: 14px 18px; }
  .workspace-grid, .upload-column, .bottom-grid { gap: 16px; }
  .upload-column { display: grid; grid-template-columns: minmax(0, 1fr); }
  .upload-panel, .suite-panel { padding: 18px; }
  .panel-title.compact { padding-inline: 18px; }
  .panel-title { gap: 10px; margin-bottom: 14px; }
  .panel-title > div:first-child { flex-basis: 170px; }
  .panel-title h3, .review-head h3 { font-size: 20px; }
  .panel-title p, .review-head p { font-size: 13px; }
  .panel-title > .text-button { min-height: 44px; font-size: 14px; }
  .dropzone { min-height: 185px; padding: 20px 14px; }
  .dropzone strong { font-size: 17px; }
  .queue-select-all { min-height: 44px; gap: 8px; font-size: 13px; }
  .queue-select-all input, .doc-select { width: 20px; height: 20px; min-height: 20px; }
  .queue-actions { gap: 12px; }
  .doc-card { gap: 8px; padding: 12px; }
  .doc-meta strong { font-size: 14px; }
  .doc-meta span, .stage { font-size: 12px; }
  .review-head { min-height: 0; padding: 18px; }
  .review-head > div:first-child { flex-basis: 220px; }
  .document-toolbar { display: grid; padding: 12px; gap: 10px; }
  .document-type-tabs { display: flex; flex-wrap: nowrap; min-width: 0; overflow-x: auto; overscroll-behavior-x: contain; }
  .document-type-tabs button { flex: 0 0 auto; min-height: 44px; padding-inline: 12px; font-size: 14px; }
  .form-section { padding: 18px 16px 0; }
  .field-grid, .sales-order-grid, .sale-edit-grid { grid-template-columns: minmax(0, 1fr); gap: 14px; }
  .field-grid label.wide, .sales-order-grid label.wide, .sale-edit-grid label.wide { grid-column: auto; }
  .app-shell input:not([type="checkbox"]):not([type="radio"]):not([type="file"]), .app-shell select, .app-shell textarea { min-width: 0; font-size: 16px; }
  .field-grid input, .field-grid select, .sales-order-grid input, .sales-order-grid select, .sale-edit-grid input, .sale-edit-grid select { min-height: 46px; }
  .secondary-button, .create-button, .delete-current-button, .module-action-button, .module-edit-button, .module-delete-button { height: auto; min-height: 44px; padding: 10px 14px; line-height: 1.5; }
  .review-footer { padding: 16px; }
  .review-footer > div:last-child { display: grid; grid-template-columns: minmax(0, 1fr); width: 100%; gap: 10px; }
  .review-footer .secondary-button, .review-footer .create-button { width: 100%; margin: 0; }
  .amounts { align-items: center; gap: 8px 14px; }
  .module-hero { min-height: 0; padding: 22px 18px; gap: 16px; }
  .module-actions { display: flex; width: 100%; justify-content: flex-start; gap: 10px; }
  .module-actions .secondary-button { margin: 0; }
  .module-actions > * { flex: 1 1 140px; text-align: center; }
  .module-table-head { padding: 16px; gap: 12px; }
  .module-table-head > div:last-child { display: flex; flex-wrap: wrap; gap: 8px; }
  .module-table-head input { flex: 1 1 100%; width: 100%; min-height: 44px; }
  .module-table-head button, .module-table-head .product-import-button { min-height: 44px; }
  .module-table-wrap, .sales-line-wrap, .item-table-wrap { max-width: 100%; overscroll-behavior-x: contain; }
  .module-table-wrap::before, .sales-line-wrap::before, .item-table-wrap::before { content: "左右滑动查看完整表格"; display: block; position: sticky; left: 0; width: fit-content; max-width: 100%; padding: 10px 12px; color: #52736d; font-size: 12px; background: #f3f9f7; }
  .module-table-wrap .ledger-table .locked-column { position: static; box-shadow: none; }
  .module-table-wrap th, .module-table-wrap td { padding: 12px; }
  .module-pagination { flex-direction: column; align-items: stretch; padding: 14px; gap: 12px; }
  .module-pagination > div { flex-wrap: wrap; justify-content: space-between; gap: 8px; }
  .module-pagination button, .module-page-size select { min-height: 44px; }
  .sales-paper-meta, .sales-paper-signoff { grid-template-columns: minmax(0, 1fr); padding: 16px; }
  .sales-paper-title { text-align: left; padding: 18px 16px; }
  .sales-paper-title strong { position: static; display: block; margin-top: 10px; overflow-wrap: anywhere; }
  .sales-order-submit { flex-direction: column; align-items: stretch; padding: 16px; gap: 10px; }
  .sales-order-submit > span { margin-right: 0; }
  .sales-order-submit button { width: 100%; margin: 0; }
  .suite-grid, .suite-totals, .finance-amount-summary, .finance-meta-grid { grid-template-columns: minmax(0, 1fr); }
  .suite-panel input, .suite-panel select, .suite-panel textarea { min-height: 44px; font-size: 16px; }
  .suite-panel input[type="checkbox"] { min-height: 20px; }
  .suite-actions button { flex: 1 1 140px; min-height: 44px; }
  .suite-member-head, .finance-attachment-controls, .sales-index-title { flex-wrap: wrap; }
  .prepaid-apply-card, .finance-subsidy-options, .receivable-group-members > div { grid-template-columns: minmax(0, 1fr); }
  .modal-backdrop { padding: 10px; align-items: center; }
  .sale-edit-modal, .info-modal, .voucher-list-modal, .voucher-preview-modal, .sales-index-modal { width: 100%; min-width: 0; max-height: calc(100dvh - 20px); overflow: auto; overscroll-behavior: contain; padding: 22px 16px; border-radius: 14px; }
  .sale-edit-modal h2, .info-modal h2 { font-size: 23px; line-height: 1.4; }
  .sale-edit-actions { position: sticky; bottom: -22px; z-index: 5; flex-wrap: wrap; padding: 14px 0 22px; background: #fff; border-top: 1px solid #dbe5e2; }
  .sale-edit-actions button { flex: 1 1 130px; margin: 0; }
  .master-data-section, .invoice-file-panel { padding: 14px; }
  .todo-list article .create-button { min-height: 44px; }
  .todo-reminder-toast, .toast { max-width: calc(100% - 24px); bottom: calc(var(--mobile-nav-height) + env(safe-area-inset-bottom) + 12px); }
  .erp-login-page { min-height: 100svh !important; padding: 16px !important; }
  .erp-login-card { padding: 28px 22px !important; }
  .erp-login-card h1 { font-size: 28px !important; }
}

@media screen and (max-width: 360px) {
  .sidebar nav .nav-group .nav-submenu { grid-template-columns: minmax(0, 1fr); }
  .topbar h1 { font-size: 20px; }
  .panel-title > div:first-child { flex-basis: 140px; }
}