/* ============================================
   Platform Admin — Design System
   Modern light, high-density, neutral-warm
   ============================================ */

:root {
  /* Surfaces */
  --bg-app: #FAFAF9;
  --bg-sidebar: #F4F3F0;
  --bg-card: #FFFFFF;
  --bg-hover: #F4F3F0;
  --bg-active: #ECEBE7;
  --bg-inset: #F7F6F3;
  --bg-mask: rgba(24, 24, 27, 0.45);

  /* Borders */
  --border: #E8E7E3;
  --border-strong: #D8D6D0;
  --border-focus: oklch(0.55 0.18 264);

  /* Text */
  --text: #18181B;
  --text-muted: #5C5C63;
  --text-subtle: #8A8A92;
  --text-faint: #B5B5BC;
  --text-inverse: #FAFAF9;

  /* Brand */
  --accent: oklch(0.55 0.18 264);
  --accent-hover: oklch(0.48 0.18 264);
  --accent-soft: oklch(0.95 0.03 264);
  --accent-text: oklch(0.42 0.18 264);

  /* Semantic */
  --success: oklch(0.58 0.14 152);
  --success-soft: oklch(0.95 0.04 152);
  --warning: oklch(0.68 0.16 75);
  --warning-soft: oklch(0.96 0.05 75);
  --danger: oklch(0.58 0.20 25);
  --danger-soft: oklch(0.96 0.04 25);
  --info: oklch(0.62 0.13 230);
  --info-soft: oklch(0.95 0.03 230);
  --purple: oklch(0.60 0.18 305);
  --purple-soft: oklch(0.96 0.04 305);

  /* Type */
  --font-sans: 'Geist', ui-sans-serif, system-ui, -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'Geist Mono', ui-monospace, 'SF Mono', Consolas, monospace;
  --fs-xs: 11px;
  --fs-sm: 12px;
  --fs-base: 13px;
  --fs-md: 14px;
  --fs-lg: 16px;
  --fs-xl: 18px;
  --fs-2xl: 22px;
  --fs-3xl: 28px;
  --fs-4xl: 36px;

  /* Spacing */
  --r-xs: 4px;
  --r-sm: 6px;
  --r-md: 8px;
  --r-lg: 12px;
  --r-xl: 16px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(24, 24, 27, 0.04), 0 0 0 0.5px rgba(24, 24, 27, 0.06);
  --shadow-md: 0 4px 12px rgba(24, 24, 27, 0.06), 0 0 0 0.5px rgba(24, 24, 27, 0.08);
  --shadow-lg: 0 12px 32px rgba(24, 24, 27, 0.12), 0 0 0 0.5px rgba(24, 24, 27, 0.08);

  /* Layout */
  --sidebar-w: 232px;
  --topbar-h: 52px;
  --row-h: 38px;
  --row-h-compact: 32px;
}

/* Font alternates (driven by font-family tweak) */
.font-geist { --font-sans: 'Geist', ui-sans-serif, system-ui, -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif; }
.font-plex  { --font-sans: 'IBM Plex Sans', ui-sans-serif, system-ui, 'PingFang SC', 'Microsoft YaHei', sans-serif; }
.font-mona  { --font-sans: 'Mona Sans', ui-sans-serif, system-ui, 'PingFang SC', 'Microsoft YaHei', sans-serif; }
.font-noto  { --font-sans: 'Noto Sans', ui-sans-serif, system-ui, 'Noto Sans SC', 'PingFang SC', sans-serif; }

/* Density */
.density-compact { --row-h: 32px; --fs-base: 12px; --fs-md: 13px; }
.density-cozy    { --row-h: 44px; }

/* Base */
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  color: var(--text);
  background: var(--bg-app);
  -webkit-font-smoothing: antialiased;
  font-feature-settings: "cv11", "ss01";
  line-height: 1.5;
}

button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: default; }

::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(0,0,0,.12); border-radius: 999px; border: 2px solid var(--bg-app); background-clip: content-box; }
::-webkit-scrollbar-thumb:hover { background: rgba(0,0,0,.22); border: 2px solid var(--bg-app); background-clip: content-box; }

/* App layout */
.app {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  grid-template-rows: var(--topbar-h) 1fr;
  grid-template-areas: "side top" "side main";
  height: 100vh;
  width: 100vw;
  overflow: hidden;
}
.app-side { grid-area: side; background: var(--bg-sidebar); border-right: 1px solid var(--border); overflow-y: auto; overflow-x: hidden; }
.app-top  { grid-area: top;  background: var(--bg-card); border-bottom: 1px solid var(--border); display: flex; align-items: center; gap: 8px; padding: 0 16px; }
.app-main { grid-area: main; overflow: auto; padding: 20px 24px 40px; }

/* Sidebar */
.brand {
  display: flex; align-items: center; gap: 8px;
  padding: 16px 14px 8px; font-weight: 600; font-size: 14px; letter-spacing: -0.01em;
}
.brand-mark {
  width: 22px; height: 22px; border-radius: 6px;
  background: linear-gradient(135deg, oklch(0.55 0.18 264), oklch(0.45 0.22 290));
  display: flex; align-items: center; justify-content: center;
  color: white; font-size: 11px; font-weight: 700; letter-spacing: -.04em;
}
.scope-picker {
  margin: 4px 10px 12px;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  background: var(--bg-card);
  display: flex; flex-direction: column; gap: 2px;
  cursor: default;
}
.scope-row { display: flex; align-items: center; gap: 6px; font-size: 11px; }
.scope-row .tag { font-size: 9px; padding: 1px 4px; border-radius: 3px; background: var(--bg-active); color: var(--text-muted); letter-spacing: .04em; text-transform: uppercase; min-width: 38px; text-align: center; }
.scope-row .name { color: var(--text); font-weight: 500; }
.scope-row .chev { margin-left: auto; color: var(--text-faint); font-size: 10px; }
.scope-row + .scope-row { padding-top: 3px; border-top: 1px dashed var(--border); margin-top: 3px; }

.nav-group { padding: 6px 10px 10px; }
.nav-label { font-size: 10px; text-transform: uppercase; letter-spacing: .08em; color: var(--text-faint); padding: 10px 8px 4px; font-weight: 600; }
.nav-item {
  display: flex; align-items: center; gap: 10px;
  padding: 6px 8px; border-radius: var(--r-sm);
  color: var(--text-muted);
  font-size: 12.5px;
  cursor: default;
  user-select: none;
}
.nav-item:hover { background: var(--bg-active); color: var(--text); }
.nav-item.active { background: var(--bg-card); color: var(--text); font-weight: 500; box-shadow: var(--shadow-sm); }
.nav-item .ico { width: 14px; height: 14px; opacity: .75; flex-shrink: 0; }
.nav-item.active .ico { opacity: 1; color: var(--accent); }
.nav-item .badge { margin-left: auto; font-size: 10px; background: var(--accent-soft); color: var(--accent-text); padding: 1px 5px; border-radius: 999px; font-weight: 500; }

/* Topbar */
.crumbs { display: flex; align-items: center; gap: 6px; font-size: 12.5px; color: var(--text-muted); }
.crumbs .sep { color: var(--text-faint); }
.crumbs .cur { color: var(--text); font-weight: 500; }
.top-search {
  flex: 1; max-width: 380px;
  display: flex; align-items: center; gap: 6px;
  padding: 6px 10px; background: var(--bg-inset); border: 1px solid transparent; border-radius: 7px;
  font-size: 12px; color: var(--text-muted); margin-left: 24px;
}
.top-search:hover { border-color: var(--border); }
.top-search .kbd { margin-left: auto; font-family: var(--font-mono); font-size: 10px; padding: 1px 4px; background: var(--bg-card); border: 1px solid var(--border); border-radius: 3px; color: var(--text-subtle); }
.top-actions { margin-left: auto; display: flex; align-items: center; gap: 4px; }
.icon-btn {
  width: 30px; height: 30px; border: 0; background: transparent; border-radius: 6px;
  display: flex; align-items: center; justify-content: center; color: var(--text-muted);
  position: relative;
}
.icon-btn:hover { background: var(--bg-hover); color: var(--text); }
.icon-btn .dot { position: absolute; top: 6px; right: 6px; width: 6px; height: 6px; background: var(--danger); border-radius: 50%; border: 1.5px solid var(--bg-card); }
.avatar { width: 26px; height: 26px; border-radius: 50%; background: linear-gradient(135deg, oklch(0.7 0.12 30), oklch(0.5 0.18 264)); display: flex; align-items: center; justify-content: center; color: white; font-size: 10px; font-weight: 600; margin-left: 4px; }

/* Page header */
.page-h { display: flex; align-items: flex-end; justify-content: space-between; gap: 16px; margin-bottom: 18px; }
.page-h h1 { font-size: 20px; font-weight: 600; letter-spacing: -0.015em; margin: 0 0 2px; }
.page-h .sub { font-size: 12.5px; color: var(--text-muted); }
.page-h .actions { display: flex; gap: 6px; align-items: center; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  height: 30px; padding: 0 12px;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text);
  font-size: 12.5px; font-weight: 500;
  border-radius: 7px;
  cursor: default;
}
.btn:hover { background: var(--bg-hover); }
.btn-pri { background: var(--text); color: var(--text-inverse); border-color: var(--text); }
.btn-pri:hover { background: #000; }
.btn-accent { background: var(--accent); color: white; border-color: var(--accent); }
.btn-accent:hover { background: var(--accent-hover); }
.btn-ghost { background: transparent; border-color: transparent; color: var(--text-muted); }
.btn-ghost:hover { background: var(--bg-hover); color: var(--text); }
.btn-sm { height: 26px; padding: 0 10px; font-size: 12px; }
.btn-xs { height: 22px; padding: 0 8px; font-size: 11px; border-radius: 5px; }
.btn-danger { color: var(--danger); border-color: oklch(0.85 0.08 25); }
.btn-danger:hover { background: var(--danger-soft); }

/* Cards & sections */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
}
.card-h { padding: 14px 16px; border-bottom: 1px solid var(--border); display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.card-h h3 { font-size: 13px; font-weight: 600; margin: 0; letter-spacing: -.005em; }
.card-h .meta { font-size: 11.5px; color: var(--text-muted); }
.card-body { padding: 16px; }

/* Grid utilities */
.row-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.row-detail-split { grid-template-columns: 1.6fr 1fr; }
.row-detail-split-audit { grid-template-columns: 1.7fr 1fr; }
.row-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.row-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.row-5 { display: grid; grid-template-columns: repeat(5, 1fr); gap: 12px; }
.stack { display: flex; flex-direction: column; gap: 16px; }

/* Stat cells */
.stat {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 14px 16px;
  display: flex; flex-direction: column; gap: 4px;
  position: relative;
  overflow: hidden;
}
.stat .lbl { font-size: 11.5px; color: var(--text-muted); display: flex; align-items: center; gap: 5px; }
.stat .num { font-size: 22px; font-weight: 600; letter-spacing: -.02em; font-variant-numeric: tabular-nums; line-height: 1.15; }
.stat .num .unit { font-size: 12px; color: var(--text-muted); font-weight: 400; margin-left: 3px; }
.stat .delta { font-size: 11px; display: inline-flex; align-items: center; gap: 3px; font-variant-numeric: tabular-nums; }
.stat .delta.up { color: var(--success); }
.stat .delta.dn { color: var(--danger); }
.stat .delta .ago { color: var(--text-faint); }
.stat .spark { position: absolute; right: 12px; bottom: 10px; opacity: .8; }

/* Tables */
.tbl { width: 100%; border-collapse: separate; border-spacing: 0; font-size: 12px; }
.tbl thead th {
  font-size: 11px; color: var(--text-muted); font-weight: 500;
  text-align: left; padding: 9px 12px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-inset);
  position: sticky; top: 0; z-index: 1;
  letter-spacing: .01em;
  white-space: nowrap;
}
.tbl tbody td { padding: 10px 12px; border-bottom: 1px solid var(--border); vertical-align: middle; }
.tbl tbody tr:last-child td { border-bottom: 0; }
.tbl tbody tr:hover td { background: var(--bg-inset); }
.tbl .right { text-align: right; font-variant-numeric: tabular-nums; }
.tbl .center { text-align: center; }
.tbl .mono { font-family: var(--font-mono); font-size: 11px; }
.tbl .muted { color: var(--text-muted); }
.tbl-actions { display: flex; gap: 4px; justify-content: flex-end; }

/* Badges & tags */
.badge {
  display: inline-flex; align-items: center; gap: 4px;
  font-size: 11px; padding: 2px 7px; border-radius: 999px;
  background: var(--bg-active); color: var(--text-muted);
  font-weight: 500; white-space: nowrap;
  border: 1px solid transparent;
}
.badge .dot { width: 5px; height: 5px; border-radius: 50%; background: currentColor; }
.badge.success { background: var(--success-soft); color: var(--success); }
.badge.warning { background: var(--warning-soft); color: oklch(0.5 0.16 75); }
.badge.danger  { background: var(--danger-soft); color: var(--danger); }
.badge.info    { background: var(--info-soft); color: var(--info); }
.badge.purple  { background: var(--purple-soft); color: var(--purple); }
.badge.accent  { background: var(--accent-soft); color: var(--accent-text); }
.badge.outline { background: transparent; border-color: var(--border); }
.badge.solid-dark { background: var(--text); color: var(--text-inverse); }
.badge.gold { background: oklch(0.95 0.06 85); color: oklch(0.45 0.13 65); }
.badge.silver { background: oklch(0.95 0.01 250); color: oklch(0.45 0.02 250); }
.badge.diamond { background: oklch(0.94 0.04 220); color: oklch(0.45 0.15 230); }

/* Forms */
.field { display: flex; flex-direction: column; gap: 5px; }
.field label { font-size: 11.5px; color: var(--text-muted); font-weight: 500; }
.input, .select, .textarea {
  height: 32px; padding: 0 10px;
  border: 1px solid var(--border); border-radius: 7px;
  background: var(--bg-card); font-size: 12.5px;
  outline: none; transition: border-color .12s, box-shadow .12s;
  width: 100%;
}
.input:focus, .select:focus, .textarea:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px color-mix(in oklch, var(--accent) 15%, transparent);
}
.textarea { height: auto; padding: 8px 10px; resize: vertical; font-family: inherit; }
.select { padding-right: 28px; appearance: none; background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'><path fill='%238a8a92' d='M0 0h10L5 6z'/></svg>"); background-repeat: no-repeat; background-position: right 10px center; }
.checkbox { width: 14px; height: 14px; border: 1px solid var(--border-strong); border-radius: 3px; background: var(--bg-card); display: inline-flex; align-items: center; justify-content: center; vertical-align: middle; flex-shrink: 0; }
.checkbox.on { background: var(--text); border-color: var(--text); }
.checkbox.on svg { color: white; }

/* Tabs */
.tabs { display: flex; gap: 2px; border-bottom: 1px solid var(--border); margin-bottom: 16px; padding: 0; }
.tab { padding: 8px 12px; font-size: 12.5px; color: var(--text-muted); cursor: default; border-bottom: 2px solid transparent; margin-bottom: -1px; user-select: none; font-weight: 500; }
.tab:hover { color: var(--text); }
.tab.active { color: var(--text); border-bottom-color: var(--text); }

/* Filter bar */
.filter-bar { display: flex; align-items: center; gap: 6px; padding: 12px 16px; border-bottom: 1px solid var(--border); flex-wrap: wrap; }
.chip {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 4px 9px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 11.5px; color: var(--text-muted); cursor: default;
}
.chip:hover { border-color: var(--border-strong); }
.chip.active { background: var(--text); color: var(--text-inverse); border-color: var(--text); }
.chip .x { margin-left: 2px; opacity: .6; }

/* Avatar list */
.avatar-sm { width: 22px; height: 22px; border-radius: 50%; display: inline-flex; align-items: center; justify-content: center; font-size: 9.5px; font-weight: 600; color: white; flex-shrink: 0; }

/* Misc */
.kbd { font-family: var(--font-mono); font-size: 10.5px; padding: 1px 5px; background: var(--bg-inset); border: 1px solid var(--border); border-radius: 4px; color: var(--text-muted); }
.divider { height: 1px; background: var(--border); margin: 12px 0; }
.divider-v { width: 1px; background: var(--border); align-self: stretch; }
.empty { text-align: center; padding: 32px; color: var(--text-faint); font-size: 12px; }

/* Sparkline */
.spark-line { stroke: var(--accent); stroke-width: 1.5; fill: none; }
.spark-area { fill: var(--accent-soft); opacity: .5; }

/* Bar mini */
.barmini { display: inline-block; height: 4px; background: var(--bg-active); border-radius: 999px; vertical-align: middle; overflow: hidden; }
.barmini > i { display: block; height: 100%; background: var(--accent); border-radius: 999px; }
.barmini.success > i { background: var(--success); }
.barmini.warning > i { background: var(--warning); }
.barmini.danger > i { background: var(--danger); }

/* Modal */
.modal-mask {
  position: fixed; inset: 0; background: var(--bg-mask);
  z-index: 1000; display: flex; align-items: center; justify-content: center;
  backdrop-filter: blur(4px);
}
.modal {
  background: var(--bg-card); border-radius: var(--r-lg);
  box-shadow: var(--shadow-lg);
  max-width: 90vw; max-height: 90vh;
  display: flex; flex-direction: column;
  overflow: hidden;
}
.modal-h { padding: 14px 18px; border-bottom: 1px solid var(--border); display: flex; align-items: center; justify-content: space-between; }
.modal-h h2 { font-size: 14px; font-weight: 600; margin: 0; }
.modal-body { padding: 18px; overflow: auto; flex: 1; }
.modal-f { padding: 12px 18px; border-top: 1px solid var(--border); display: flex; gap: 6px; justify-content: flex-end; background: var(--bg-inset); }

/* Toast */
.toast-stack { position: fixed; bottom: 18px; left: 50%; transform: translateX(-50%); z-index: 2000; display: flex; flex-direction: column; gap: 8px; pointer-events: none; }
.toast { background: var(--text); color: var(--text-inverse); padding: 8px 14px; border-radius: 8px; font-size: 12.5px; box-shadow: var(--shadow-lg); pointer-events: auto; display: flex; align-items: center; gap: 8px; animation: toast-in .2s; }
@keyframes toast-in { from { opacity: 0; transform: translateY(6px); } }

/* User detail panel split */
.split { display: grid; grid-template-columns: 320px 1fr; gap: 16px; }
.profile-card { display: flex; flex-direction: column; gap: 14px; }
.profile-h { display: flex; gap: 12px; align-items: center; }
.profile-avatar { width: 52px; height: 52px; border-radius: 50%; background: linear-gradient(135deg, oklch(0.7 0.14 30), oklch(0.5 0.18 264)); color: white; display: flex; align-items: center; justify-content: center; font-size: 18px; font-weight: 600; }
.kv { display: grid; grid-template-columns: 90px 1fr; gap: 6px 12px; font-size: 12px; }
.kv dt { color: var(--text-muted); font-weight: 400; }
.kv dd { margin: 0; color: var(--text); font-variant-numeric: tabular-nums; }

/* Page builder */
.pb-stage {
  background: repeating-conic-gradient(#F4F3F0 0% 25%, transparent 0% 50%) 0 0 / 16px 16px;
  background-color: #FAFAF9;
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  min-height: 600px;
  padding: 20px;
}
.pb-comp { background: var(--bg-card); border: 1px dashed var(--border-strong); border-radius: var(--r-md); padding: 12px; margin-bottom: 10px; position: relative; }
.pb-comp:hover { border-color: var(--accent); border-style: solid; }
.pb-comp.selected { border-color: var(--accent); border-style: solid; box-shadow: 0 0 0 3px color-mix(in oklch, var(--accent) 18%, transparent); }
.pb-comp .pb-label { position: absolute; top: -10px; left: 8px; background: var(--accent); color: white; font-size: 9px; padding: 1px 5px; border-radius: 3px; letter-spacing: .04em; text-transform: uppercase; opacity: 0; }
.pb-comp:hover .pb-label, .pb-comp.selected .pb-label { opacity: 1; }

/* Sidebar resize handle */
.app-side::-webkit-scrollbar-thumb { border-color: var(--bg-sidebar); }

/* Helpers */
.text-muted { color: var(--text-muted); }
.text-subtle { color: var(--text-subtle); }
.text-faint { color: var(--text-faint); }
.text-success { color: var(--success); }
.text-danger { color: var(--danger); }
.text-warning { color: oklch(0.5 0.16 75); }
.text-mono { font-family: var(--font-mono); }
.tabular { font-variant-numeric: tabular-nums; }
.truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* Status dot before text */
.status-dot { display: inline-flex; align-items: center; gap: 5px; }
.status-dot::before { content: ''; display: inline-block; width: 6px; height: 6px; border-radius: 50%; background: var(--success); }
.status-dot.warn::before { background: var(--warning); }
.status-dot.dn::before { background: var(--danger); }
.status-dot.off::before { background: var(--text-faint); }

/* ────────────────────────────────────────────────────────────────────────────
   Responsive — tablet & phone
   Note: existing layout uses .row-2 / .row-3 / .row-4 (grids) and
   --sidebar-w as the layout token. Aliases (.grid-N) also collapse.
   ──────────────────────────────────────────────────────────────────────── */

/* Hamburger — hidden by default; .hamburger { display: inline-flex } is
   forced on at < 1024px via media query below. */
.hamburger {
  display: none;
  align-items: center; justify-content: center;
  width: 32px; height: 32px;
  background: transparent; border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-size: 16px; line-height: 1;
  cursor: pointer;
  flex-shrink: 0;
  padding: 0;
  margin-right: 4px;
}
.hamburger:hover { background: var(--bg-hover); }
.hamburger:active { transform: scale(0.96); }

/* Hidden by default; populated below at tablet width. */
.app-side-backdrop { display: none; }

/* 1024-1279px: condensed laptop — narrower sidebar, KPI grids stay 2-col */
@media (max-width: 1279px) {
  :root { --sidebar-w: 200px; }
  .page-h h1 { font-size: 18px; }
  .row-4, .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .card-body { padding: 12px; }
}

/* 768-1023px: tablet — sidebar collapses into overlay drawer */
@media (max-width: 1023px) {
  .app {
    grid-template-columns: 1fr;
    grid-template-rows: var(--topbar-h) 1fr;
    grid-template-areas: "top" "main";
  }
  .app-side {
    position: fixed; top: 0; left: 0; bottom: 0;
    width: 240px; z-index: 1000;
    transform: translateX(-100%);
    transition: transform 0.2s ease-out;
    box-shadow: 4px 0 24px rgba(0,0,0,.3);
    border-right: 1px solid var(--border);
  }
  .app-side.open { transform: translateX(0); }
  .app-side-backdrop {
    display: block;
    position: fixed; inset: 0; z-index: 999;
    background: rgba(0,0,0,.4);
    opacity: 0; pointer-events: none;
    transition: opacity 0.2s;
  }
  .app-side-backdrop.open { opacity: 1; pointer-events: auto; }
  .app-top { z-index: 50; }
  .app-main { padding: 14px 16px 32px; }
  .hamburger { display: inline-flex; }
  .scope-picker { display: none; }      /* hide on tablet+ */
  .top-search { display: none; }        /* hide search bar in topbar */
  .crumbs { font-size: 12px; min-width: 0; overflow: hidden; }
  .crumbs span:not(.cur):not(.sep) { display: none; }
  .crumbs .sep { display: none; }
  .row-4, .grid-4, .row-3, .grid-3 { grid-template-columns: repeat(2, 1fr); }
}

/* < 768px: phone — single column, stacked tables, full-screen modals */
@media (max-width: 767px) {
  body { font-size: 14px; }
  .app-main { padding: 10px 12px 28px; }
  .page-h { flex-direction: column; align-items: flex-start; gap: 8px; }
  .page-h h1 { font-size: 16px; }
  .page-h .actions { width: 100%; flex-wrap: wrap; }
  .row-2, .row-3, .row-4, .row-5,
  .grid-2, .grid-3, .grid-4,
  .row-detail-split, .row-detail-split-audit { grid-template-columns: 1fr; }

  /* Modal: full-screen on phones */
  .modal-mask { padding: 0 !important; }
  .modal {
    max-width: 100vw !important;
    max-height: 100vh !important;
    width: 100vw !important;
    height: 100vh;
    border-radius: 0 !important;
  }
  .modal-body { padding: 14px; }

  /* Tables that opt in via .tbl-stack — turn rows into cards */
  .tbl-stack thead { display: none; }
  .tbl-stack, .tbl-stack tbody, .tbl-stack tr, .tbl-stack td { display: block; width: 100%; }
  .tbl-stack tr {
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 8px 10px;
    margin-bottom: 8px;
    background: var(--bg-card);
  }
  .tbl-stack tbody tr:hover td { background: transparent; }
  .tbl-stack td {
    padding: 4px 0;
    display: flex; justify-content: space-between; align-items: center; gap: 8px;
    border-bottom: 1px dashed var(--border);
    text-align: right;
    min-height: 22px;
  }
  .tbl-stack td:last-child { border-bottom: none; }
  .tbl-stack td::before {
    content: attr(data-label);
    color: var(--text-faint);
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: .04em;
    text-align: left;
    flex-shrink: 0;
  }

  /* Tables that stay as tables — horizontal scroll w/ sticky first column */
  .tbl-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; }
  .tbl-scroll table { min-width: max-content; }
  .tbl-scroll th:first-child,
  .tbl-scroll td:first-child {
    position: sticky; left: 0;
    background: var(--bg-card); z-index: 2;
    box-shadow: 2px 0 4px rgba(0,0,0,.06);
  }
  .tbl-scroll thead th:first-child { background: var(--bg-inset); }

  /* Topbar compact */
  .top-actions { gap: 2px; }
  .top-actions .icon-btn { width: 28px; height: 28px; }
  .top-actions > div:last-child.avatar { display: none; }
  .crumbs { font-size: 11px; }

  /* Cards smaller */
  .card-h { padding: 10px 12px; }
  .card-h h3 { font-size: 13px; }
  .card-body { padding: 12px; }

  /* Tweaks panel becomes a bottom sheet */
  .twk-panel {
    right: 0 !important; left: 0 !important; bottom: 0 !important;
    top: auto !important;
    width: 100% !important;
    max-width: 100vw !important;
    max-height: 60vh;
    border-radius: 12px 12px 0 0 !important;
    transform: none !important;
  }

  /* Inputs: 16px font-size prevents iOS auto-zoom on focus */
  .input, .select, .textarea { font-size: 16px; }

  /* Filter bar: wrap nicely */
  .filter-bar { padding: 10px 12px; gap: 4px; }
}