/* ===== RESET & BASE ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --sb-w: 240px;
  --sb-bg: #0f172a;
  --sb-text: #94a3b8;
  --sb-text-hover: #e2e8f0;
  --sb-active: #3b82f6;
  --sb-active-bg: rgba(59,130,246,.12);
  --sb-border: rgba(255,255,255,.06);
  --topbar-h: 56px;
  --content-bg: #f1f5f9;
  --card-bg: #ffffff;
  --border: #e2e8f0;
  --text: #1e293b;
  --text-2: #64748b;
  --text-3: #94a3b8;
  --primary: #3b82f6;
  --primary-d: #2563eb;
  --success: #22c55e;
  --danger: #ef4444;
  --warning: #f59e0b;
  --info: #06b6d4;
  --purple: #8b5cf6;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,.1), 0 1px 2px rgba(0,0,0,.06);
  --shadow-md: 0 4px 6px rgba(0,0,0,.07), 0 2px 4px rgba(0,0,0,.06);
  --shadow-lg: 0 10px 15px rgba(0,0,0,.1), 0 4px 6px rgba(0,0,0,.05);
}
html, body { height: 100%; font-family: system-ui, -apple-system, 'Segoe UI', sans-serif; font-size: 14px; color: var(--text); background: var(--content-bg); }

/* ===== LAYOUT ===== */
.app-shell { display: flex; height: 100vh; overflow: hidden; }

/* ===== SIDEBAR ===== */
.sidebar {
  width: var(--sb-w);
  min-width: var(--sb-w);
  background: var(--sb-bg);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  overflow-x: hidden;
  transition: transform .25s ease, width .25s ease, min-width .25s ease;
  z-index: 100;
  scrollbar-width: thin;
  scrollbar-color: rgba(255,255,255,.1) transparent;
}
.sidebar::-webkit-scrollbar { width: 4px; }
.sidebar::-webkit-scrollbar-thumb { background: rgba(255,255,255,.1); border-radius: 2px; }

.sidebar.collapsed { width: 56px; min-width: 56px; }
.sidebar.collapsed .nav-text,
.sidebar.collapsed .section-arrow,
.sidebar.collapsed .brand-name,
.sidebar.collapsed .sidebar-date,
.sidebar.collapsed .sidebar-user-info .nav-text { display: none; }
.sidebar.collapsed .nav-section-items { display: none !important; }
.sidebar.collapsed .nav-link { justify-content: center; padding: 10px; }
.sidebar.collapsed .nav-link .nav-icon { margin: 0; }

.sidebar-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 12px; border-bottom: 1px solid var(--sb-border);
  min-height: 60px; flex-shrink: 0;
}
.sidebar-brand { display: flex; align-items: center; gap: 10px; overflow: hidden; }
.brand-icon { font-size: 20px; flex-shrink: 0; }
.brand-name { font-size: 14px; font-weight: 700; color: #e2e8f0; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.sidebar-toggle-btn { background: none; border: none; color: var(--sb-text); cursor: pointer; font-size: 18px; padding: 4px; border-radius: 4px; flex-shrink: 0; transition: color .15s; }
.sidebar-toggle-btn:hover { color: #e2e8f0; }

.sidebar-nav { flex: 1; padding: 8px 0; }
.nav-link {
  display: flex; align-items: center; gap: 10px;
  padding: 9px 14px; color: var(--sb-text); text-decoration: none;
  border-radius: 6px; margin: 1px 6px; font-size: 13px;
  transition: background .15s, color .15s; cursor: pointer;
}
.nav-link:hover { background: rgba(255,255,255,.06); color: var(--sb-text-hover); }
.nav-link.active { background: var(--sb-active-bg); color: var(--sb-active); font-weight: 600; }
.nav-icon { font-size: 16px; flex-shrink: 0; width: 20px; text-align: center; }
.nav-text { white-space: nowrap; }
.nav-sub { padding: 7px 14px 7px 44px; }

.nav-section-header {
  display: flex; align-items: center; gap: 10px;
  padding: 8px 14px; cursor: pointer; color: var(--sb-text);
  font-size: 12px; font-weight: 600; text-transform: uppercase; letter-spacing: .05em;
  transition: color .15s; margin: 4px 6px 0; border-radius: 6px;
}
.nav-section-header:hover { color: var(--sb-text-hover); background: rgba(255,255,255,.04); }
.section-arrow { font-size: 11px; transition: transform .2s; margin-left: auto; }
.nav-section-items { overflow: hidden; }

.sidebar-footer {
  padding: 12px; border-top: 1px solid var(--sb-border); flex-shrink: 0;
}
.sidebar-user-info { display: flex; align-items: center; gap: 8px; color: var(--sb-text); font-size: 13px; margin-bottom: 4px; }
.sidebar-date { color: #475569; font-size: 11px; padding-left: 4px; }

/* ===== SIDEBAR OVERLAY (mobile) ===== */
.sidebar-overlay {
  display: none; position: fixed; inset: 0; background: rgba(0,0,0,.5); z-index: 99;
}

/* ===== MAIN WRAPPER ===== */
.main-wrapper {
  flex: 1; display: flex; flex-direction: column; overflow: hidden;
  transition: margin-left .25s;
}

/* ===== TOPBAR ===== */
.topbar {
  height: var(--topbar-h); min-height: var(--topbar-h);
  background: var(--card-bg); border-bottom: 1px solid var(--border);
  display: flex; align-items: center; gap: 12px; padding: 0 20px;
  box-shadow: var(--shadow); z-index: 50; flex-shrink: 0;
}
.topbar-menu-btn { background: none; border: none; font-size: 20px; color: var(--text-2); cursor: pointer; padding: 4px 6px; border-radius: 4px; display: none; }
.topbar-menu-btn:hover { background: var(--content-bg); }
.topbar-breadcrumb { flex: 1; font-weight: 600; font-size: 15px; color: var(--text); }
.topbar-right { display: flex; align-items: center; gap: 8px; }

/* ===== CONTENT ===== */
.content-area { flex: 1; overflow-y: auto; padding: 20px; }

/* ===== CARDS ===== */
.card {
  background: var(--card-bg); border-radius: var(--radius);
  border: 1px solid var(--border); box-shadow: var(--shadow);
}
.card-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 20px; border-bottom: 1px solid var(--border);
  flex-wrap: wrap; gap: 12px;
}
.card-title { font-size: 15px; font-weight: 600; color: var(--text); }
.card-body { padding: 20px; }
.card-actions { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }

/* ===== KPI GRID ===== */
.kpi-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 16px; margin-bottom: 20px; }
.kpi-card {
  background: var(--card-bg); border-radius: var(--radius); border: 1px solid var(--border);
  padding: 20px; display: flex; align-items: flex-start; gap: 14px; box-shadow: var(--shadow);
}
.kpi-icon { font-size: 28px; flex-shrink: 0; }
.kpi-data { flex: 1; min-width: 0; }
.kpi-label { font-size: 12px; color: var(--text-2); font-weight: 500; text-transform: uppercase; letter-spacing: .04em; margin-bottom: 4px; }
.kpi-value { font-size: 20px; font-weight: 700; color: var(--text); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.kpi-sub { font-size: 12px; color: var(--text-3); margin-top: 2px; }
.kpi-card.danger .kpi-value { color: var(--danger); }
.kpi-card.success .kpi-value { color: var(--success); }
.kpi-card.warning .kpi-value { color: var(--warning); }
.kpi-card.info .kpi-value { color: var(--info); }

/* ===== TABLES ===== */
.table-wrap { overflow-x: auto; }
.table { width: 100%; border-collapse: collapse; font-size: 13px; }
.table th, .table td { padding: 10px 14px; text-align: left; border-bottom: 1px solid var(--border); white-space: nowrap; }
.table th { background: #f8fafc; color: var(--text-2); font-weight: 600; font-size: 12px; text-transform: uppercase; letter-spacing: .04em; position: sticky; top: 0; }
.table tbody tr { transition: background .1s; }
.table tbody tr:hover { background: #f8fafc; }
.table tbody tr:last-child td { border-bottom: none; }
.table .td-wrap { white-space: normal; max-width: 200px; }
.table .td-actions { display: flex; gap: 6px; }
.row-low-stock { background: rgba(239,68,68,.05) !important; }
.row-low-stock:hover { background: rgba(239,68,68,.08) !important; }
.row-overdue-red { background: rgba(239,68,68,.05) !important; }
.row-overdue-yellow { background: rgba(245,158,11,.05) !important; }
.row-overdue-green { background: rgba(34,197,94,.04) !important; }

/* ===== BADGES ===== */
.badge { display: inline-block; padding: 2px 8px; border-radius: 20px; font-size: 11px; font-weight: 600; letter-spacing: .03em; }
.badge-success { background: rgba(34,197,94,.12); color: #16a34a; }
.badge-danger { background: rgba(239,68,68,.12); color: #dc2626; }
.badge-warning { background: rgba(245,158,11,.12); color: #d97706; }
.badge-info { background: rgba(6,182,212,.12); color: #0891b2; }
.badge-secondary { background: rgba(100,116,139,.1); color: #64748b; }
.badge-primary { background: rgba(59,130,246,.12); color: #2563eb; }
.badge-purple { background: rgba(139,92,246,.12); color: #7c3aed; }

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 7px 14px; border-radius: 6px; border: 1px solid transparent;
  font-size: 13px; font-weight: 500; cursor: pointer; text-decoration: none;
  transition: all .15s; white-space: nowrap; line-height: 1.4;
}
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn-primary { background: var(--primary); color: #fff; border-color: var(--primary); }
.btn-primary:hover:not(:disabled) { background: var(--primary-d); border-color: var(--primary-d); }
.btn-success { background: var(--success); color: #fff; border-color: var(--success); }
.btn-success:hover:not(:disabled) { background: #16a34a; }
.btn-danger { background: var(--danger); color: #fff; border-color: var(--danger); }
.btn-danger:hover:not(:disabled) { background: #dc2626; }
.btn-warning { background: var(--warning); color: #fff; border-color: var(--warning); }
.btn-warning:hover:not(:disabled) { background: #d97706; }
.btn-secondary { background: #f1f5f9; color: var(--text-2); border-color: var(--border); }
.btn-secondary:hover:not(:disabled) { background: #e2e8f0; }
.btn-outline { background: transparent; color: var(--primary); border-color: var(--primary); }
.btn-outline:hover:not(:disabled) { background: var(--primary); color: #fff; }
.btn-sm { padding: 4px 10px; font-size: 12px; }
.btn-xs { padding: 2px 7px; font-size: 11px; }
.btn-icon { padding: 6px; border-radius: 6px; }
.btn-group { display: flex; gap: 6px; flex-wrap: wrap; }

/* ===== FORMS ===== */
.form-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 14px 20px; }
.form-col-2 { grid-template-columns: 1fr 1fr; }
.form-col-3 { grid-template-columns: 1fr 1fr 1fr; }
.form-full { grid-column: 1 / -1; }
.form-group { display: flex; flex-direction: column; gap: 5px; }
.form-label { font-size: 12px; font-weight: 600; color: var(--text-2); text-transform: uppercase; letter-spacing: .04em; }
.form-control {
  padding: 8px 10px; border: 1.5px solid var(--border); border-radius: 6px;
  font-size: 13px; color: var(--text); background: #fff; outline: none;
  transition: border-color .15s, box-shadow .15s; width: 100%;
  font-family: inherit;
}
.form-control:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(59,130,246,.1); }
.form-control:disabled { background: #f8fafc; color: var(--text-3); }
select.form-control { appearance: none; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%2364748b' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 10px center; padding-right: 30px; }
textarea.form-control { resize: vertical; min-height: 70px; }
.form-hint { font-size: 11px; color: var(--text-3); }
.form-section-title { font-size: 12px; font-weight: 700; color: var(--text-2); text-transform: uppercase; letter-spacing: .06em; padding: 10px 0 6px; border-bottom: 1px solid var(--border); margin-bottom: 12px; grid-column: 1 / -1; }

/* ===== SEARCH BAR ===== */
.search-bar { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.search-input-wrap { position: relative; }
.search-input-wrap input { padding-left: 34px; min-width: 220px; }
.search-input-wrap::before { content: '🔍'; position: absolute; left: 10px; top: 50%; transform: translateY(-50%); font-size: 13px; }

/* ===== MODAL ===== */
.modal-backdrop {
  display: none; position: fixed; inset: 0; background: rgba(0,0,0,.5);
  z-index: 200; align-items: flex-start; justify-content: center; padding: 20px;
  overflow-y: auto;
}
.modal-backdrop.open { display: flex; }
.modal-box {
  background: var(--card-bg); border-radius: var(--radius); box-shadow: var(--shadow-lg);
  width: 100%; max-width: 760px; margin: auto; display: flex; flex-direction: column;
  max-height: calc(100vh - 40px);
}
.modal-box.modal-lg { max-width: 1000px; }
.modal-box.modal-sm { max-width: 480px; }
.modal-hdr {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 20px; border-bottom: 1px solid var(--border); flex-shrink: 0;
}
.modal-ttl { font-size: 15px; font-weight: 700; color: var(--text); }
.modal-close-btn { background: none; border: none; color: var(--text-3); cursor: pointer; font-size: 18px; padding: 4px; border-radius: 4px; transition: color .15s; }
.modal-close-btn:hover { color: var(--danger); }
.modal-bdy { flex: 1; overflow-y: auto; padding: 20px; }
.modal-ftr { padding: 14px 20px; border-top: 1px solid var(--border); display: flex; justify-content: flex-end; gap: 8px; flex-shrink: 0; }

/* ===== LINE ITEMS ===== */
.line-items-section { margin-top: 16px; }
.line-items-section .table th, .line-items-section .table td { padding: 6px 8px; white-space: nowrap; }
.line-items-section .form-control { padding: 5px 7px; font-size: 12px; }
.line-items-section select.form-control { min-width: 150px; }
.line-items-section input.form-control { min-width: 70px; }
.li-input-num { max-width: 90px !important; min-width: 70px !important; }
.totals-row { display: flex; gap: 20px; margin-top: 12px; justify-content: flex-end; flex-wrap: wrap; }
.totals-row .total-item { display: flex; align-items: center; gap: 8px; font-size: 13px; }
.totals-row .total-item label { display: flex; align-items: center; gap: 5px; }
.total-main { font-size: 16px; font-weight: 700; color: var(--text); }

/* ===== PROGRESS BAR ===== */
.progress-bar { height: 8px; background: #e2e8f0; border-radius: 4px; overflow: hidden; margin-top: 6px; }
.progress-fill { height: 100%; border-radius: 4px; transition: width .3s; }
.progress-fill.green { background: var(--success); }
.progress-fill.yellow { background: var(--warning); }
.progress-fill.red { background: var(--danger); }

/* ===== TOAST ===== */
.toast-stack { position: fixed; bottom: 20px; right: 20px; z-index: 9999; display: flex; flex-direction: column; gap: 8px; }
.toast {
  padding: 10px 18px; border-radius: 8px; font-size: 13px; font-weight: 500;
  box-shadow: var(--shadow-md); min-width: 200px; max-width: 360px;
  transform: translateX(110%); transition: transform .25s ease;
}
.toast.show { transform: translateX(0); }
.toast-success { background: #022c22; color: #4ade80; border: 1px solid rgba(74,222,128,.2); }
.toast-danger { background: #3b0a0a; color: #f87171; border: 1px solid rgba(248,113,113,.2); }
.toast-info { background: #082f49; color: #67e8f9; border: 1px solid rgba(103,232,249,.2); }
.toast-warning { background: #431407; color: #fbbf24; border: 1px solid rgba(251,191,36,.2); }

/* ===== EMPTY STATE ===== */
.empty-state { text-align: center; padding: 60px 20px; color: var(--text-2); }
.empty-state-icon { font-size: 48px; margin-bottom: 12px; }
.empty-state h3 { font-size: 16px; color: var(--text); margin-bottom: 6px; }
.empty-state p { font-size: 13px; }

/* ===== PAGE HEADER ===== */
.page-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 16px; flex-wrap: wrap; gap: 10px; }
.page-title { font-size: 18px; font-weight: 700; color: var(--text); }

/* ===== MISC ===== */
.text-success { color: var(--success); }
.text-danger { color: var(--danger); }
.text-warning { color: var(--warning); }
.text-info { color: var(--info); }
.text-muted { color: var(--text-3); }
.text-right { text-align: right; }
.text-center { text-align: center; }
.font-bold { font-weight: 700; }
.font-mono { font-family: 'Courier New', monospace; }
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.flex { display: flex; }
.flex-col { flex-direction: column; }
.gap-2 { gap: 8px; }
.gap-3 { gap: 12px; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.w-full { width: 100%; }

.section-divider { margin: 20px 0; height: 1px; background: var(--border); }
.alert { padding: 10px 14px; border-radius: 6px; font-size: 13px; margin-bottom: 12px; }
.alert-warning { background: rgba(245,158,11,.1); border: 1px solid rgba(245,158,11,.3); color: #92400e; }
.alert-danger { background: rgba(239,68,68,.1); border: 1px solid rgba(239,68,68,.3); color: #991b1b; }
.alert-info { background: rgba(59,130,246,.08); border: 1px solid rgba(59,130,246,.2); color: #1e40af; }
.alert-success { background: rgba(34,197,94,.08); border: 1px solid rgba(34,197,94,.2); color: #166534; }

.dashboard-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(340px, 1fr)); gap: 16px; }
.dashboard-list { list-style: none; }
.dashboard-list li { display: flex; justify-content: space-between; padding: 8px 0; border-bottom: 1px solid var(--border); font-size: 13px; }
.dashboard-list li:last-child { border-bottom: none; }
.quick-actions { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 20px; }

/* ===== PRINT ===== */
@media print {
  .sidebar, .topbar, .modal-backdrop, .toast-stack, .btn { display: none !important; }
  .main-wrapper { margin-left: 0 !important; }
  .content-area { padding: 0 !important; }
  .card { box-shadow: none !important; border: 1px solid #ccc !important; }
  .print-doc { padding: 20mm; font-size: 12pt; }
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  :root { --sb-w: 240px; }
  .sidebar {
    position: fixed; left: 0; top: 0; bottom: 0; transform: translateX(-100%);
    transition: transform .25s ease; z-index: 100;
  }
  .sidebar.mobile-open { transform: translateX(0); }
  .sidebar-overlay.active { display: block; }
  .main-wrapper { width: 100%; }
  .topbar-menu-btn { display: block; }
  .form-grid { grid-template-columns: 1fr; }
  .form-col-2, .form-col-3 { grid-template-columns: 1fr; }
  .kpi-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 480px) {
  .kpi-grid { grid-template-columns: 1fr; }
  .modal-box { margin: 10px; max-height: calc(100vh - 20px); }
  .content-area { padding: 12px; }
}