:root {
  --bg: #f4f5f7;
  --panel-bg: #ffffff;
  --text: #1a1d23;
  --text-muted: #6b7280;
  --border: #e0e2e7;
  --accent: #1f6f5c;
  --accent-hover: #175646;
  --warning-bg: #fff4e5;
  --warning-text: #92400e;
  --error-bg: #fde8e8;
  --error-text: #9b1c1c;
  --ok-bg: #e7f6ec;
  --ok-text: #166534;
  --info-bg: #e5f0ff;
  --info-text: #1d4ed8;
  --purple-bg: #f1e7fd;
  --purple-text: #6b21a8;
  --badge-bg: #eef0f3;
  --overlay: rgba(15, 17, 20, 0.5);
  --content-max-width: 1320px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161a;
    --panel-bg: #1d2025;
    --text: #e7e9ec;
    --text-muted: #9aa0aa;
    --border: #2c3038;
    --accent: #3ba98a;
    --accent-hover: #4fc4a1;
    --warning-bg: #3a2a12;
    --warning-text: #f0b95c;
    --error-bg: #3a1616;
    --error-text: #f28b8b;
    --ok-bg: #123322;
    --ok-text: #74d99f;
    --info-bg: #16233d;
    --info-text: #7db2ff;
    --purple-bg: #2c1f42;
    --purple-text: #cba7f5;
    --badge-bg: #262a31;
    --overlay: rgba(0, 0, 0, 0.65);
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.4;
}

h1 { font-size: 1.5rem; margin: 0 0 1rem; }
h2 { font-size: 1.1rem; margin: 0 0 .75rem; }
h3 { font-size: 1rem; margin: 0 0 .5rem; }

/* ---- Sidebar shell ------------------------------------------------------- */

.app-shell { display: flex; min-height: 100vh; align-items: stretch; }

.sidebar {
  flex: 0 0 220px;
  width: 220px;
  background: var(--panel-bg);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  overflow-x: hidden;
  transition: flex-basis .15s ease, width .15s ease;
  z-index: 50;
}
.sidebar.collapsed { flex-basis: 64px; width: 64px; }
.sidebar.collapsed .sidebar-label,
.sidebar.collapsed .sidebar-logo-text,
.sidebar.collapsed .sidebar-version { display: none; }
.sidebar.collapsed .sidebar-header { justify-content: center; }

.sidebar-header {
  display: flex;
  align-items: center;
  gap: .6rem;
  padding: 1rem .85rem;
  border-bottom: 1px solid var(--border);
  min-height: 32px;
}

.sidebar-toggle {
  background: none;
  border: 1px solid transparent;
  border-radius: 6px;
  color: var(--text-muted);
  cursor: pointer;
  padding: .3rem;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.sidebar-toggle:hover { background: var(--badge-bg); color: var(--text); }

.sidebar-logo { font-weight: 700; font-size: .95rem; overflow: hidden; white-space: nowrap; }

.sidebar-nav {
  flex: 1;
  padding: .75rem .5rem;
  display: flex;
  flex-direction: column;
  gap: .15rem;
  overflow-y: auto;
}

.sidebar-link {
  display: flex;
  align-items: center;
  gap: .7rem;
  padding: .55rem .65rem;
  border-radius: 8px;
  color: var(--text-muted);
  text-decoration: none;
  font-size: .88rem;
  white-space: nowrap;
  overflow: hidden;
}
.sidebar-link svg { flex-shrink: 0; }
.sidebar-link:hover { background: var(--badge-bg); color: var(--text); }
.sidebar-link.active { background: var(--accent); color: #fff; }

.sidebar-footer {
  border-top: 1px solid var(--border);
  padding: .6rem .5rem;
  display: flex;
  flex-direction: column;
  gap: .2rem;
}
.sidebar-footer-link {
  display: flex;
  align-items: center;
  gap: .7rem;
  padding: .5rem .65rem;
  border-radius: 8px;
  color: var(--text-muted);
  text-decoration: none;
  font-size: .82rem;
  white-space: nowrap;
  overflow: hidden;
}
.sidebar-footer-link svg { flex-shrink: 0; }
.sidebar-footer-link:hover { background: var(--badge-bg); color: var(--text); }
.sidebar-version { padding: .35rem .65rem; font-size: .72rem; color: var(--text-muted); white-space: nowrap; overflow: hidden; }

.app-content { flex: 1; min-width: 0; }

.app-main { max-width: var(--content-max-width); margin: 0 auto; padding: 1.5rem; }

@media (max-width: 1024px) {
  .sidebar:not(.collapsed) { flex-basis: 196px; width: 196px; }
}

.panel {
  background: var(--panel-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.25rem;
  margin-bottom: 1.25rem;
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: .75rem;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.card {
  background: var(--panel-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem;
}
.card-label { color: var(--text-muted); font-size: .8rem; text-transform: uppercase; letter-spacing: .04em; }
.card-sublabel { text-transform: none; letter-spacing: normal; }
.card-value { font-size: 1.8rem; font-weight: 700; margin-top: .25rem; }
.card-warning .card-value, .card-warning { color: var(--warning-text); }
.card-error .card-value, .card-error { color: var(--error-text); }

.card-clickable {
  display: block;
  width: 100%;
  text-align: left;
  font: inherit;
  color: inherit;
  cursor: pointer;
  transition: border-color .12s, transform .12s;
}
.card-clickable:hover { border-color: var(--accent); transform: translateY(-1px); }
.card-clickable:active { transform: translateY(0); }

table { width: 100%; border-collapse: collapse; font-size: .9rem; }
th, td { text-align: left; padding: .5rem .6rem; border-bottom: 1px solid var(--border); }
th { color: var(--text-muted); font-weight: 600; font-size: .8rem; text-transform: uppercase; letter-spacing: .03em; }
tbody tr:hover { background: var(--badge-bg); }

tr.row-inactive { opacity: .55; }
tr.row-selected { background: var(--badge-bg); }
tr.row-invalid td { color: var(--error-text); }
tr.row-invalid { background: var(--error-bg); }
tr.row-bottleneck td { font-weight: 600; }

.actions button { margin-right: .5rem; }

.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: .85rem;
  align-items: end;
  margin-top: .5rem;
}
.form-grid-compact { grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); }

.form-grid label {
  display: flex;
  flex-direction: column;
  gap: .3rem;
  font-size: .85rem;
  color: var(--text-muted);
}

input, select {
  padding: .5rem .6rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
  color: var(--text);
  font-size: .9rem;
}

.btn {
  display: inline-block;
  padding: .55rem 1rem;
  border-radius: 6px;
  border: none;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  cursor: pointer;
  font-size: .9rem;
  text-decoration: none;
  line-height: 1.2;
}
.btn:hover { background: var(--accent-hover); }
.btn:disabled { background: var(--border); color: var(--text-muted); cursor: not-allowed; }

.btn-secondary { background: var(--badge-bg); color: var(--text); }
.btn-secondary:hover { background: var(--border); }

.btn-link {
  background: none;
  border: none;
  color: var(--accent);
  cursor: pointer;
  padding: 0;
  font-size: .85rem;
  text-decoration: underline;
}

.file-btn { cursor: pointer; display: inline-flex; align-items: center; }

.button-row { display: flex; gap: .6rem; flex-wrap: wrap; align-items: center; }

.inline-panel {
  border: 1px dashed var(--border);
  border-radius: 8px;
  padding: 1rem;
  margin: .75rem 0;
  background: var(--bg);
}

details { margin-top: .75rem; }
details summary { cursor: pointer; color: var(--accent); font-weight: 600; }

.alert {
  padding: .6rem .8rem;
  border-radius: 6px;
  margin-top: .75rem;
  font-size: .9rem;
}
.alert-ok { background: var(--ok-bg); color: var(--ok-text); }
.alert-warning { background: var(--warning-bg); color: var(--warning-text); }
.alert-error { background: var(--error-bg); color: var(--error-text); }

.badge {
  display: inline-block;
  padding: .15rem .5rem;
  border-radius: 999px;
  background: var(--badge-bg);
  font-size: .75rem;
  color: var(--text-muted);
}
.badge-ok { background: var(--ok-bg); color: var(--ok-text); }
.badge-receive { background: var(--ok-bg); color: var(--ok-text); }
.badge-issue { background: var(--info-bg); color: var(--info-text); }
.badge-adjustment { background: var(--warning-bg); color: var(--warning-text); }
.badge-writeoff { background: var(--error-bg); color: var(--error-text); }
.badge-bottleneck { background: var(--error-bg); color: var(--error-text); }
.badge-instock { background: var(--ok-bg); color: var(--ok-text); }
.badge-lowstock { background: var(--warning-bg); color: var(--warning-text); }
.badge-outofstock { background: var(--error-bg); color: var(--error-text); }
.badge-purchase { background: var(--purple-bg); color: var(--purple-text); }
.badge-reservation { background: var(--purple-bg); color: var(--purple-text); }

.checkbox-label { display: inline-flex; align-items: center; gap: .4rem; font-size: .85rem; color: var(--text-muted); cursor: pointer; }

.hint { color: var(--text-muted); font-size: .85rem; }
.muted { color: var(--text-muted); }

/* ---- Filter bar / search / sort (Warehouse) ---------------------------- */

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: .6rem;
  margin: .75rem 0 1rem;
}
.filter-bar select { min-width: 140px; }
.search-input { flex: 1 1 220px; min-width: 180px; }

mark { background: #ffe58f; color: #1a1d23; border-radius: 3px; padding: 0 .1em; }

.table-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; }

.sortable-header th[data-sort] { cursor: pointer; user-select: none; white-space: nowrap; }
.sortable-header th[data-sort]:hover { color: var(--text); }

.cell-sub { font-size: .75rem; color: var(--text-muted); margin-top: .1rem; }

.link-cell {
  background: none;
  border: none;
  padding: 0;
  color: var(--text);
  font-weight: 600;
  cursor: pointer;
  text-align: left;
  font-size: inherit;
}
.link-cell:hover { color: var(--accent); text-decoration: underline; }

.form-grid-full { grid-column: 1 / -1; }
.form-grid-full textarea { resize: vertical; font-family: inherit; }

/* ---- Action menu (⋮) ----------------------------------------------------- */

.menu-wrap { position: relative; display: inline-block; }

.btn-icon {
  background: none;
  border: 1px solid transparent;
  border-radius: 6px;
  font-size: 1.1rem;
  line-height: 1;
  padding: .3rem .55rem;
  cursor: pointer;
  color: var(--text);
}
.btn-icon:hover { background: var(--badge-bg); border-color: var(--border); }

.dropdown-menu {
  display: none;
  position: absolute;
  right: 0;
  top: calc(100% + 4px);
  min-width: 190px;
  background: var(--panel-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, .15);
  padding: .35rem;
  z-index: 20;
}
.dropdown-menu.open { display: block; }
.dropdown-menu button {
  display: block;
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  padding: .5rem .6rem;
  border-radius: 6px;
  font-size: .85rem;
  color: var(--text);
  cursor: pointer;
}
.dropdown-menu button:hover { background: var(--badge-bg); }
.dropdown-menu hr { border: none; border-top: 1px solid var(--border); margin: .3rem 0; }

/* ---- Modal ----------------------------------------------------------------- */

.modal-overlay {
  position: fixed;
  inset: 0;
  background: var(--overlay);
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 4vh 1rem;
  z-index: 100;
  overflow-y: auto;
}
.modal-dialog {
  background: var(--panel-bg);
  border-radius: 12px;
  width: 100%;
  max-width: 560px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, .3);
}
.modal-dialog.modal-lg { max-width: 780px; }
.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border);
}
.modal-header h2 { margin: 0; font-size: 1.05rem; }
.modal-close {
  background: none;
  border: none;
  font-size: 1.4rem;
  line-height: 1;
  cursor: pointer;
  color: var(--text-muted);
  padding: .1rem .4rem;
}
.modal-close:hover { color: var(--text); }
.modal-body { padding: 1.25rem; max-height: 70vh; overflow-y: auto; }
.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: .6rem;
  padding: 1rem 1.25rem;
  border-top: 1px solid var(--border);
}
.modal-actions { margin-top: 1rem; padding-top: 1rem; border-top: 1px solid var(--border); }

.details-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: .9rem;
  margin-bottom: 1rem;
}
.details-label { display: block; font-size: .75rem; text-transform: uppercase; letter-spacing: .03em; color: var(--text-muted); margin-bottom: .2rem; }
.details-block { margin-top: 1rem; }
.model-links { list-style: none; padding: 0; margin: .3rem 0 0; display: flex; flex-wrap: wrap; gap: .5rem; }
.model-links .btn-link { text-decoration: none; background: var(--badge-bg); padding: .3rem .6rem; border-radius: 999px; }

.inline-link { display: inline-flex; align-items: center; gap: .35rem; color: var(--accent); text-decoration: none; }
.inline-link:hover { text-decoration: underline; }
.inline-link svg { flex-shrink: 0; }

/* ---- Toast notifications --------------------------------------------------- */

.toast-container {
  position: fixed;
  bottom: 1.25rem;
  right: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: .5rem;
  z-index: 200;
  max-width: 360px;
}
.toast {
  display: flex;
  align-items: flex-start;
  gap: .6rem;
  padding: .7rem .9rem;
  border-radius: 8px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, .2);
  font-size: .88rem;
  background: var(--panel-bg);
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  animation: toast-in .15s ease-out;
}
.toast-ok { border-left-color: var(--ok-text); }
.toast-warning { border-left-color: var(--warning-text); }
.toast-error { border-left-color: var(--error-text); }
.toast-info { border-left-color: var(--info-text); }
.toast-hide { opacity: 0; transform: translateX(8px); transition: opacity .2s, transform .2s; }
.toast span { flex: 1; }
.toast-close { background: none; border: none; cursor: pointer; color: var(--text-muted); font-size: 1rem; line-height: 1; padding: 0; }

@keyframes toast-in {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---- Laptop / iPad layout tightening ---------------------------------- */

@media (min-width: 900px) and (max-width: 1366px) {
  .app-main { padding: 1.25rem; }
  .card-grid { grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); }
}

@media (max-width: 1024px) {
  .form-grid { grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); }
  .filter-bar select { min-width: 120px; }
}

@media (max-width: 640px) {
  .sidebar:not(.collapsed) { flex-basis: 180px; width: 180px; }
  table, thead, tbody, th, td, tr { display: block; }
  thead { display: none; }
  tr { border-bottom: 2px solid var(--border); padding: .5rem 0; }
  td { border: none; padding: .25rem 0; }
  td::before { content: attr(data-label); font-weight: 600; display: block; font-size: .75rem; color: var(--text-muted); }
}

/* ---- Auth (Phase 2) --------------------------------------------------- */

/* .app-shell/.login-screen both set `display: flex`, an author-origin
   declaration - which beats the browser's built-in `[hidden] { display:
   none }` UA-stylesheet rule regardless of selector specificity, since
   origin is resolved before specificity in the cascade. Without these two
   overrides, toggling the `hidden` attribute on either element would not
   actually hide it. */
.app-shell[hidden] { display: none; }
.login-screen[hidden] { display: none; }

.login-screen {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
  padding: 1rem;
}
.login-card {
  width: 100%;
  max-width: 340px;
  background: var(--panel-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 2rem 1.75rem;
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.08);
}
.login-brand {
  font-weight: 700;
  color: var(--accent);
  font-size: .85rem;
  text-transform: uppercase;
  letter-spacing: .04em;
  margin-bottom: .35rem;
}
.login-card h1 { font-size: 1.35rem; margin: 0 0 1.25rem; }
.login-form { display: flex; flex-direction: column; gap: .9rem; }
.login-form label { display: flex; flex-direction: column; gap: .3rem; font-size: .85rem; color: var(--text-muted); }
.login-form input { width: 100%; }
.login-submit { width: 100%; text-align: center; margin-top: .25rem; }
#login-message:empty { display: none; }

.sidebar-user-info {
  padding: .5rem .65rem .7rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: .3rem;
}
.sidebar-user-name { font-weight: 600; font-size: .85rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.sidebar-user-role { font-size: .75rem; color: var(--text-muted); margin-bottom: .35rem; }
.sidebar.collapsed .sidebar-user-info { display: none; }