/* ── Reset & base ──────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --brand:          #1C2B4A;
  --brand-light:    #2D4270;
  --accent:         #C9A84C;
  --accent-light:   #F5EDD5;

  --bg:             #F7F7F5;
  --surface:        #FFFFFF;
  --surface-raised: #FFFFFF;

  --text-primary:   #111827;
  --text-secondary: #4B5563;
  --text-tertiary:  #9CA3AF;

  --border-subtle:  #F3F4F6;
  --border-default: #E5E7EB;
  --border-strong:  #D1D5DB;

  --success:        #16A34A;
  --success-bg:     #F0FDF4;
  --success-border: #BBF7D0;
  --warning:        #D97706;
  --warning-bg:     #FFFBEB;
  --warning-border: #FDE68A;
  --danger:         #DC2626;
  --danger-bg:      #FEF2F2;
  --danger-border:  #FECACA;

  --radius-sm:      4px;
  --radius:         8px;
  --radius-lg:      12px;

  --shadow-sm:      0 1px 2px rgba(0,0,0,0.05);
  --shadow:         0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md:      0 4px 6px rgba(0,0,0,0.06), 0 2px 4px rgba(0,0,0,0.04);

  --transition:     150ms ease-out;
}

body {
  font-family: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 14px;
  line-height: 1.5;
  color: var(--text-primary);
  background: var(--bg);
  min-height: 100vh;
}

/* ── Header ──────────────────────────────────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--brand);
  border-bottom: 1px solid var(--brand-light);
  height: 56px;
}

.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.header-brand {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.wordmark {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: #fff;
}

.wordmark-sub {
  font-size: 11px;
  font-weight: 400;
  color: rgba(255,255,255,0.5);
  letter-spacing: 0.04em;
}

.module-name {
  font-size: 13px;
  font-weight: 500;
  color: rgba(255,255,255,0.7);
  letter-spacing: 0.02em;
}

/* ── Buttons ──────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: inherit;
  font-size: 13px;
  font-weight: 500;
  border-radius: var(--radius-sm);
  padding: 7px 14px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
  line-height: 1;
}
.btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.btn-primary {
  background: var(--accent);
  color: var(--brand);
  border-color: var(--accent);
  font-weight: 600;
}
.btn-primary:hover { background: #b8943e; border-color: #b8943e; }

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border-color: var(--border-default);
}
.btn-ghost:hover { background: var(--bg); color: var(--text-primary); border-color: var(--border-strong); }

.btn-ghost.danger { color: var(--danger); }
.btn-ghost.danger:hover { background: var(--danger-bg); border-color: var(--danger-border); }

/* ── Main layout ──────────────────────────────────────────────────────────── */
.site-main {
  max-width: 1280px;
  margin: 0 auto;
  padding: 32px 24px 64px;
}

.hidden { display: none !important; }

/* ── Dashboard ────────────────────────────────────────────────────────────── */
.page-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 24px;
  gap: 16px;
  flex-wrap: wrap;
}

.page-title {
  font-family: 'DM Serif Display', serif;
  font-size: 26px;
  font-weight: 400;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  margin-bottom: 2px;
}

.page-subtitle {
  font-size: 13px;
  color: var(--text-secondary);
}

.filter-bar {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
}

.filter-select {
  font-family: inherit;
  font-size: 13px;
  color: var(--text-secondary);
  background: var(--surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
  padding: 6px 10px;
  cursor: pointer;
  transition: border-color var(--transition);
}
.filter-select:focus { outline: none; border-color: var(--brand); }

/* ── Stat cards ───────────────────────────────────────────────────────────── */
.stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-bottom: 20px;
}

.stat-card {
  background: var(--surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius);
  padding: 16px 20px;
  box-shadow: var(--shadow-sm);
}

.stat-label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  margin-bottom: 6px;
}

.stat-value {
  font-size: 24px;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}
.stat-value.warning { color: var(--warning); }
.stat-value.success { color: var(--success); }
.stat-value.muted   { color: var(--text-secondary); }

/* ── Table ────────────────────────────────────────────────────────────────── */
.table-card {
  background: var(--surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.po-table {
  width: 100%;
  border-collapse: collapse;
}

.po-table thead th {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  text-align: left;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-default);
  white-space: nowrap;
  background: var(--bg);
}

.po-table tbody td {
  padding: 13px 16px;
  border-bottom: 1px solid var(--border-subtle);
  color: var(--text-primary);
  font-size: 13.5px;
  vertical-align: middle;
}

.po-table tbody tr:last-child td { border-bottom: none; }

.po-table tbody tr:hover td { background: #fafafa; }

.po-table tbody tr { cursor: pointer; transition: background var(--transition); }

.po-num { font-weight: 600; font-size: 12px; letter-spacing: 0.04em; color: var(--brand); }
.po-desc { color: var(--text-primary); max-width: 260px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.po-amount { font-weight: 600; font-variant-numeric: tabular-nums; }

/* ── Status badges ────────────────────────────────────────────────────────── */
.badge {
  display: inline-flex;
  align-items: center;
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  white-space: nowrap;
}

.badge-draft    { color: var(--text-secondary); background: var(--bg); border-color: var(--border-default); }
.badge-pending  { color: var(--warning); background: var(--warning-bg); border-color: var(--warning-border); }
.badge-approved { color: var(--success); background: var(--success-bg); border-color: var(--success-border); }
.badge-rejected { color: var(--danger); background: var(--danger-bg); border-color: var(--danger-border); }

/* ── Empty state ──────────────────────────────────────────────────────────── */
.empty-row td { padding: 64px 24px !important; }

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  color: var(--text-tertiary);
}

.empty-icon { color: var(--border-strong); margin-bottom: 4px; }
.empty-title { font-size: 15px; font-weight: 600; color: var(--text-secondary); }
.empty-body { font-size: 13px; color: var(--text-tertiary); margin-bottom: 8px; }

/* ── Form view ────────────────────────────────────────────────────────────── */
.form-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  gap: 16px;
}

.back-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: inherit;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px 0;
  transition: color var(--transition);
}
.back-btn:hover { color: var(--text-primary); }

.form-po-number {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--text-tertiary);
  text-transform: uppercase;
}

.form-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 20px;
  align-items: start;
}

.form-card {
  background: var(--surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  margin-bottom: 16px;
}

.form-section-title {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-subtle);
}

.field-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 16px;
}

.field { margin-bottom: 16px; }
.field:last-child { margin-bottom: 0; }

.field-label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 6px;
  letter-spacing: 0.02em;
}

.required { color: var(--danger); margin-left: 2px; }

.field-input {
  display: block;
  width: 100%;
  font-family: inherit;
  font-size: 13.5px;
  color: var(--text-primary);
  background: var(--surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
  padding: 8px 10px;
  transition: border-color var(--transition), box-shadow var(--transition);
  -webkit-appearance: none;
}
.field-input:focus {
  outline: none;
  border-color: var(--brand);
  box-shadow: 0 0 0 3px rgba(28, 43, 74, 0.08);
}
.field-input.error { border-color: var(--danger); }

.field-textarea { resize: vertical; min-height: 72px; }

/* ── Line items ───────────────────────────────────────────────────────────── */
.line-items-header {
  display: grid;
  grid-template-columns: 1fr 72px 140px 80px 120px 32px;
  gap: 8px;
  padding: 0 0 8px;
  border-bottom: 1px solid var(--border-default);
  margin-bottom: 8px;
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-tertiary);
}

.line-item-row {
  display: grid;
  grid-template-columns: 1fr 72px 140px 80px 120px 32px;
  gap: 8px;
  align-items: center;
  margin-bottom: 8px;
}

.line-item-row .field-input {
  margin: 0;
}

.line-item-total {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
  padding: 8px 4px;
}

.line-item-gst {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 4px;
}
.line-item-gst input[type="checkbox"] { width: 14px; height: 14px; accent-color: var(--brand); cursor: pointer; }
.line-item-gst label { font-size: 12px; color: var(--text-secondary); cursor: pointer; }

.remove-line-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background: none;
  border: none;
  border-radius: var(--radius-sm);
  color: var(--text-tertiary);
  cursor: pointer;
  transition: color var(--transition), background var(--transition);
  flex-shrink: 0;
}
.remove-line-btn:hover { color: var(--danger); background: var(--danger-bg); }

.add-line-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: inherit;
  font-size: 12.5px;
  font-weight: 500;
  color: var(--brand);
  background: none;
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius-sm);
  padding: 7px 14px;
  cursor: pointer;
  transition: all var(--transition);
  margin-top: 4px;
}
.add-line-btn:hover { background: var(--bg); border-style: solid; }

.totals-block {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--border-default);
  margin-left: auto;
  width: 320px;
}

.total-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 5px 0;
  font-size: 13px;
  color: var(--text-secondary);
}

.total-row-grand {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
  border-top: 2px solid var(--border-default);
  padding-top: 10px;
  margin-top: 4px;
}

/* ── Form actions ──────────────────────────────────────────────────────────── */
.form-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 4px;
}

.detail-actions {
  display: flex;
  gap: 8px;
}

/* ── Sidebar ──────────────────────────────────────────────────────────────── */
.form-sidebar { position: sticky; top: 72px; }

.sidebar-card {
  background: var(--surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow-sm);
  margin-bottom: 12px;
}

.sidebar-info { background: #f9f8f6; }

.sidebar-title {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-subtle);
}

.sidebar-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 6px 0;
  font-size: 13px;
}

.sidebar-row-total { padding-top: 12px; }

.sidebar-label { color: var(--text-secondary); }
.sidebar-val { font-weight: 500; color: var(--text-primary); text-align: right; max-width: 140px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.sidebar-total { font-size: 18px; font-weight: 700; color: var(--text-primary); }
.sidebar-divider { border-top: 1px solid var(--border-default); margin: 8px 0; }

.sidebar-body {
  font-size: 12.5px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 14px;
}

.approval-tier { display: flex; flex-direction: column; gap: 6px; }

.tier-row {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  padding: 6px 10px;
  background: var(--surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
}

.tier-range { color: var(--text-secondary); }
.tier-owner { font-weight: 600; color: var(--text-primary); }

/* ── Detail view ──────────────────────────────────────────────────────────── */
.detail-card {
  background: var(--surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: var(--shadow-sm);
  margin-bottom: 16px;
  max-width: 860px;
}

.detail-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-default);
}

.detail-org { font-size: 10px; font-weight: 700; letter-spacing: 0.2em; text-transform: uppercase; color: var(--text-tertiary); margin-bottom: 4px; }
.detail-title { font-family: 'DM Serif Display', serif; font-size: 22px; color: var(--text-primary); }
.detail-po-num { font-size: 12px; font-weight: 600; letter-spacing: 0.08em; color: var(--text-tertiary); margin-top: 4px; }

.detail-meta-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 24px;
}

.detail-meta-item { }
.detail-meta-label { font-size: 10.5px; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; color: var(--text-tertiary); margin-bottom: 3px; }
.detail-meta-value { font-size: 14px; color: var(--text-primary); font-weight: 500; }

.detail-section-title {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-subtle);
}

.detail-items-table { width: 100%; border-collapse: collapse; margin-bottom: 16px; }
.detail-items-table th {
  font-size: 10.5px; font-weight: 600; letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--text-tertiary); text-align: left; padding: 8px 12px;
  background: var(--bg); border-bottom: 1px solid var(--border-default);
}
.detail-items-table td { padding: 10px 12px; border-bottom: 1px solid var(--border-subtle); font-size: 13.5px; }
.detail-items-table tr:last-child td { border-bottom: none; }
.detail-items-table .td-right { text-align: right; font-variant-numeric: tabular-nums; }

.detail-totals { width: 280px; margin-left: auto; }
.detail-total-row { display: flex; justify-content: space-between; padding: 5px 0; font-size: 13px; color: var(--text-secondary); }
.detail-total-grand { font-size: 16px; font-weight: 700; color: var(--text-primary); border-top: 2px solid var(--border-default); padding-top: 10px; margin-top: 4px; }

/* ── Table action button ─────────────────────────────────────────────────── */
.po-number-cell { font-weight: 600; font-size: 12px; letter-spacing: 0.04em; color: var(--brand); white-space: nowrap; }
.amount-cell { font-weight: 600; font-variant-numeric: tabular-nums; white-space: nowrap; }

.table-action-btn {
  font-family: inherit;
  font-size: 12px;
  font-weight: 500;
  color: var(--brand);
  background: none;
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
  padding: 4px 10px;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}
.table-action-btn:hover { background: var(--bg); border-color: var(--brand); }

/* ── Detail view (generated HTML) ───────────────────────────────────────── */
.detail-wrap { max-width: 860px; }

.detail-hero {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  gap: 16px;
  flex-wrap: wrap;
}

.detail-po-meta {
  display: flex;
  align-items: center;
  gap: 12px;
}

.detail-po-number {
  font-family: 'DM Serif Display', serif;
  font-size: 22px;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.badge-lg {
  font-size: 11.5px;
  padding: 4px 10px;
}

.detail-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 0;
}

.detail-card-title {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-subtle);
}

.detail-fields { display: flex; flex-direction: column; gap: 0; }

.detail-field {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 7px 0;
  border-bottom: 1px solid var(--border-subtle);
  gap: 12px;
}
.detail-field:last-child { border-bottom: none; }

.detail-field-label { font-size: 12px; color: var(--text-secondary); flex-shrink: 0; }
.detail-field-val { font-size: 13px; font-weight: 500; color: var(--text-primary); text-align: right; }
.detail-amount { font-size: 15px; font-weight: 700; color: var(--text-primary); }

.detail-justification {
  font-size: 14px;
  line-height: 1.65;
  color: var(--text-primary);
}

.detail-notes {
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-secondary);
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid var(--border-subtle);
}

.detail-line-table {
  width: 100%;
  border-collapse: collapse;
}
.detail-line-table thead th {
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  text-align: left;
  padding: 8px 10px;
  background: var(--bg);
  border-bottom: 1px solid var(--border-default);
}
.detail-line-table tbody td {
  padding: 10px 10px;
  border-bottom: 1px solid var(--border-subtle);
  font-size: 13.5px;
  color: var(--text-primary);
}
.detail-line-table tbody tr:last-child td { border-bottom: none; }
.detail-line-table tfoot td {
  padding: 6px 10px;
  font-size: 13px;
  color: var(--text-secondary);
  border-top: 1px solid var(--border-subtle);
}
.detail-line-table tfoot tr:first-child td { border-top: 1px solid var(--border-default); }

.detail-total-row td { }
.detail-grand-total td {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
  border-top: 2px solid var(--border-strong) !important;
  padding-top: 10px;
}

.text-right { text-align: right; font-variant-numeric: tabular-nums; }

/* ── Toast ───────────────────────────────────────────────────────────────── */
.cpg-toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(12px);
  background: var(--brand);
  color: #fff;
  font-size: 13px;
  font-weight: 500;
  padding: 10px 20px;
  border-radius: 20px;
  box-shadow: var(--shadow-md);
  opacity: 0;
  pointer-events: none;
  transition: opacity 200ms ease, transform 200ms ease;
  white-space: nowrap;
  z-index: 100;
}
.cpg-toast.toast-visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ── Print ────────────────────────────────────────────────────────────────── */
@media print {
  .site-header, .back-btn, .detail-actions, .form-actions { display: none !important; }
  body { background: white; }
  .detail-card { box-shadow: none; border: none; }
}

/* ── Responsive ───────────────────────────────────────────────────────────── */
@media (max-width: 900px) {
  .form-layout { grid-template-columns: 1fr; }
  .form-sidebar { position: static; }
  .stats-row { grid-template-columns: repeat(2, 1fr); }
  .detail-meta-grid { grid-template-columns: repeat(2, 1fr); }
  .detail-grid { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .site-main { padding: 20px 16px 48px; }
  .stats-row { grid-template-columns: 1fr 1fr; }
  .line-items-header, .line-item-row {
    grid-template-columns: 1fr 56px 110px 60px 100px 28px;
  }
  .totals-block { width: 100%; }
  .po-table { font-size: 12px; }
}