:root {
  --brand-orange: #ea580c;
  --brand-orange-hover: #c2410c;
  --brand-orange-light: #ffedd5;
  --brand-amber: #f59e0b;
  --slate-950: #090d16;
  --slate-900: #0f172a;
  --slate-800: #1e293b;
  --slate-700: #334155;
  --slate-600: #475569;
  --slate-500: #64748b;
  --slate-400: #94a3b8;
  --slate-300: #cbd5e1;
  --slate-200: #e2e8f0;
  --slate-100: #f1f5f9;
  --slate-50: #f8fafc;
  --success: #16a34a;
  --success-bg: #dcfce7;
  --danger: #dc2626;
  --danger-bg: #fee2e2;
  --warning: #d97706;
  --warning-bg: #fef3c7;
  --info: #2563eb;
  --info-bg: #dbeafe;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.08);
  --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 12px 28px rgba(15, 23, 42, 0.14);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background-color: var(--slate-100);
  color: var(--slate-900);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* ==========================================================================
   LOGIN SCREEN
   ========================================================================== */
.login-overlay {
  position: fixed;
  inset: 0;
  background: linear-gradient(135deg, var(--slate-950) 0%, var(--slate-800) 60%, #431407 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.25rem;
  z-index: 9999;
}

.login-card {
  background: #ffffff;
  width: 100%;
  max-width: 420px;
  border-radius: var(--radius-lg);
  padding: 2.25rem 2rem;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.45);
  border-top: 5px solid var(--brand-orange);
}

.login-brand {
  text-align: center;
  margin-bottom: 1.5rem;
}

.login-logo {
  width: 96px;
  height: 96px;
  object-fit: contain;
  border-radius: 16px;
  border: 2px solid var(--slate-200);
  padding: 6px;
  background: #fff;
  margin-bottom: 0.75rem;
  box-shadow: var(--shadow-sm);
}

.login-brand h1 {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--slate-900);
  letter-spacing: -0.02em;
}

.login-brand p {
  font-size: 0.875rem;
  color: var(--slate-500);
  margin-top: 0.2rem;
}

/* ==========================================================================
   LAYOUT (SIDEBAR + MAIN + MOBILE BOTTOM NAV)
   ========================================================================== */
.app-shell {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: 265px;
  background: var(--slate-900);
  color: #ffffff;
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  border-right: 1px solid var(--slate-800);
}

.sidebar-brand {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 1.25rem 1.15rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(0, 0, 0, 0.2);
}

.sidebar-logo {
  width: 48px;
  height: 48px;
  border-radius: 10px;
  object-fit: contain;
  background: #ffffff;
  padding: 3px;
  flex-shrink: 0;
}

.sidebar-brand-text h2 {
  font-size: 1.05rem;
  font-weight: 800;
  color: #ffffff;
  line-height: 1.2;
}

.sidebar-brand-text span {
  font-size: 0.75rem;
  color: var(--slate-400);
  display: block;
}

.nav-list {
  list-style: none;
  padding: 0.85rem 0.75rem;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  width: 100%;
  padding: 0.72rem 0.9rem;
  border-radius: var(--radius-sm);
  border: none;
  background: transparent;
  color: var(--slate-300);
  font-size: 0.92rem;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  transition: all 0.15s ease;
}

.nav-item:hover {
  background: rgba(255, 255, 255, 0.07);
  color: #ffffff;
}

.nav-item.active {
  background: var(--brand-orange);
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(234, 88, 12, 0.35);
}

.nav-icon {
  font-size: 1.15rem;
  width: 24px;
  text-align: center;
}

.sidebar-footer {
  padding: 1rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 0.78rem;
  color: var(--slate-400);
}

.db-status-pill {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.06);
  margin-bottom: 0.65rem;
  font-weight: 600;
  color: var(--slate-200);
}

.status-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: #22c55e;
  box-shadow: 0 0 8px #22c55e;
}

.status-dot.cloud {
  background: #38bdf8;
  box-shadow: 0 0 8px #38bdf8;
}

.main-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding-bottom: 80px;
}

/* ==========================================================================
   TOP HEADER
   ========================================================================== */
.top-header {
  background: #ffffff;
  padding: 0.9rem 1.5rem;
  border-bottom: 1px solid var(--slate-200);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  position: sticky;
  top: 0;
  z-index: 50;
  flex-wrap: wrap;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.mobile-logo {
  display: none;
  width: 40px;
  height: 40px;
  border-radius: 8px;
  object-fit: contain;
  border: 1px solid var(--slate-200);
}

.page-title-wrap h1 {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--slate-900);
}

.page-title-wrap p {
  font-size: 0.8rem;
  color: var(--slate-500);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.live-stock-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.42rem 0.85rem;
  border-radius: 999px;
  font-size: 0.84rem;
  font-weight: 700;
  background: var(--brand-orange-light);
  color: var(--brand-orange-hover);
  border: 1px solid #fed7aa;
}

.live-stock-badge.low-stock {
  background: var(--danger-bg);
  color: var(--danger);
  border-color: #fecaca;
}

/* ==========================================================================
   CONTENT & CARDS
   ========================================================================== */
.content-container {
  padding: 1.5rem;
  max-width: 1400px;
  width: 100%;
  margin: 0 auto;
}

.view-section {
  display: none;
}

.view-section.active {
  display: block;
}

.kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.kpi-card {
  background: #ffffff;
  border-radius: var(--radius-md);
  padding: 1.15rem 1.25rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--slate-200);
  border-left: 4px solid var(--brand-orange);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.kpi-card.green { border-left-color: var(--success); }
.kpi-card.red { border-left-color: var(--danger); }
.kpi-card.blue { border-left-color: var(--info); }
.kpi-card.amber { border-left-color: var(--warning); }
.kpi-card.slate { border-left-color: var(--slate-700); }

.kpi-label {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-weight: 700;
  color: var(--slate-500);
  margin-bottom: 0.35rem;
}

.kpi-value {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--slate-900);
  line-height: 1.2;
}

.kpi-sub {
  font-size: 0.78rem;
  color: var(--slate-500);
  margin-top: 0.4rem;
}

.card {
  background: #ffffff;
  border-radius: var(--radius-md);
  border: 1px solid var(--slate-200);
  box-shadow: var(--shadow-sm);
  margin-bottom: 1.5rem;
  overflow: hidden;
}

.card-header {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--slate-200);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  background: var(--slate-50);
}

.card-header h3 {
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--slate-900);
}

.card-body {
  padding: 1.25rem;
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1.35fr;
  gap: 1.5rem;
  align-items: start;
}

.grid-equal {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  align-items: start;
}

/* ==========================================================================
   FORMS, INPUTS & QUICK BUTTONS
   ========================================================================== */
.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 0.9rem;
}

.form-group {
  margin-bottom: 0.9rem;
}

.form-group label {
  display: block;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--slate-700);
  margin-bottom: 0.35rem;
}

.form-control {
  width: 100%;
  padding: 0.62rem 0.8rem;
  border: 1px solid var(--slate-300);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  color: var(--slate-900);
  background: #ffffff;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.form-control:focus {
  outline: none;
  border-color: var(--brand-orange);
  box-shadow: 0 0 0 3px rgba(234, 88, 12, 0.15);
}

.form-control[readonly] {
  background: var(--slate-100);
  font-weight: 700;
}

.quick-cylinders {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.45rem;
}

.chip-btn {
  padding: 0.3rem 0.65rem;
  border-radius: 999px;
  border: 1px solid #fdba74;
  background: var(--brand-orange-light);
  color: var(--brand-orange-hover);
  font-size: 0.78rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.15s;
}

.chip-btn:hover {
  background: var(--brand-orange);
  color: #ffffff;
  border-color: var(--brand-orange);
}

.calc-preview {
  background: var(--slate-50);
  border: 1px dashed var(--slate-300);
  border-radius: var(--radius-sm);
  padding: 0.85rem 1rem;
  margin-bottom: 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.calc-preview .calc-item span {
  display: block;
  font-size: 0.75rem;
  color: var(--slate-500);
  font-weight: 600;
}

.calc-preview .calc-item strong {
  font-size: 1.15rem;
  color: var(--slate-900);
}

/* ==========================================================================
   BUTTONS & BADGES
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  padding: 0.62rem 1.1rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 700;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.15s ease;
  text-decoration: none;
}

.btn-sm {
  padding: 0.35rem 0.7rem;
  font-size: 0.8rem;
}

.btn-primary {
  background: var(--brand-orange);
  color: #ffffff;
}

.btn-primary:hover {
  background: var(--brand-orange-hover);
}

.btn-success {
  background: var(--success);
  color: #ffffff;
}

.btn-success:hover {
  background: #15803d;
}

.btn-danger {
  background: var(--danger);
  color: #ffffff;
}

.btn-danger:hover {
  background: #b91c1c;
}

.btn-outline {
  background: #ffffff;
  border-color: var(--slate-300);
  color: var(--slate-700);
}

.btn-outline:hover {
  background: var(--slate-100);
  color: var(--slate-900);
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  font-size: 0.74rem;
  font-weight: 700;
}

.badge-success { background: var(--success-bg); color: var(--success); }
.badge-danger { background: var(--danger-bg); color: var(--danger); }
.badge-warning { background: var(--warning-bg); color: var(--warning); }
.badge-info { background: var(--info-bg); color: var(--info); }
.badge-slate { background: var(--slate-200); color: var(--slate-700); }

/* ==========================================================================
   TABLES
   ========================================================================== */
.table-responsive {
  width: 100%;
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}

th {
  background: var(--slate-50);
  color: var(--slate-600);
  font-weight: 700;
  text-align: left;
  padding: 0.75rem 0.9rem;
  border-bottom: 2px solid var(--slate-200);
  white-space: nowrap;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

td {
  padding: 0.75rem 0.9rem;
  border-bottom: 1px solid var(--slate-200);
  color: var(--slate-800);
  vertical-align: middle;
}

tr:hover td {
  background-color: var(--slate-50);
}

.text-right { text-align: right; }
.text-center { text-align: center; }
.font-bold { font-weight: 700; }
.text-success { color: var(--success); }
.text-danger { color: var(--danger); }
.text-warning { color: var(--warning); }
.text-muted { color: var(--slate-500); }

/* ==========================================================================
   TABS & SUB-NAVIGATION
   ========================================================================== */
.sub-tabs {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 1.25rem;
  border-bottom: 2px solid var(--slate-200);
  padding-bottom: 0.5rem;
}

.sub-tab-btn {
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  background: transparent;
  color: var(--slate-600);
  font-weight: 700;
  font-size: 0.88rem;
  cursor: pointer;
}

.sub-tab-btn.active {
  background: var(--brand-orange);
  color: #ffffff;
}

/* ==========================================================================
   MODAL (CUSTOMER KHATA / SUPPLIER KHATA / STATEMENT)
   ========================================================================== */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.65);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  z-index: 2000;
  overflow-y: auto;
}

.modal-backdrop.open {
  display: flex;
}

.modal-dialog {
  background: #ffffff;
  border-radius: var(--radius-lg);
  max-width: 960px;
  width: 100%;
  max-height: 92vh;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

.modal-header {
  padding: 1.1rem 1.4rem;
  background: var(--slate-900);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-body {
  padding: 1.4rem;
  overflow-y: auto;
  flex: 1;
}

.modal-footer {
  padding: 0.9rem 1.4rem;
  background: var(--slate-50);
  border-top: 1px solid var(--slate-200);
  display: flex;
  justify-content: flex-end;
  gap: 0.65rem;
  flex-wrap: wrap;
}

/* ==========================================================================
   PRINTABLE STATEMENT & REPORT HEADER
   ========================================================================== */
.statement-print-header {
  border-bottom: 2px solid var(--slate-900);
  padding-bottom: 1rem;
  margin-bottom: 1.25rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.statement-brand {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.statement-brand img {
  width: 68px;
  height: 68px;
  object-fit: contain;
  border-radius: 10px;
  border: 1px solid var(--slate-300);
  padding: 4px;
}

/* ==========================================================================
   TOAST NOTIFICATION
   ========================================================================== */
.toast-container {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.toast {
  background: var(--slate-900);
  color: #ffffff;
  padding: 0.8rem 1.2rem;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-lg);
  border-left: 4px solid var(--brand-orange);
  font-size: 0.88rem;
  font-weight: 600;
  min-width: 260px;
}

/* ==========================================================================
   MOBILE BOTTOM NAVIGATION
   ========================================================================== */
.mobile-bottom-nav {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--slate-900);
  border-top: 1px solid var(--slate-800);
  z-index: 1000;
  justify-content: space-around;
  padding: 0.35rem 0.2rem;
}

.mobile-nav-btn {
  background: none;
  border: none;
  color: var(--slate-400);
  display: flex;
  flex-direction: column;
  align-items: center;
  font-size: 0.68rem;
  font-weight: 600;
  gap: 0.15rem;
  padding: 0.35rem 0.4rem;
  border-radius: 8px;
  cursor: pointer;
}

.mobile-nav-btn.active {
  color: #ffffff;
  background: var(--brand-orange);
}

.mobile-nav-btn span.icon {
  font-size: 1.1rem;
}

@media (max-width: 980px) {
  .sidebar {
    display: none;
  }
  .mobile-bottom-nav {
    display: flex;
  }
  .mobile-logo {
    display: block;
  }
  .grid-2, .grid-equal {
    grid-template-columns: 1fr;
  }
  .content-container {
    padding: 1rem;
  }
  .toast-container {
    bottom: 4.8rem;
    right: 1rem;
    left: 1rem;
  }
}

@media print {
  body {
    background: #ffffff !important;
  }
  .sidebar,
  .top-header,
  .mobile-bottom-nav,
  .no-print,
  .toast-container {
    display: none !important;
  }
  .main-area {
    padding: 0 !important;
  }
  .modal-backdrop.open {
    position: static !important;
    background: none !important;
    padding: 0 !important;
  }
  .modal-dialog {
    max-width: 100% !important;
    max-height: none !important;
    box-shadow: none !important;
    border: none !important;
  }
  .modal-header, .modal-footer {
    display: none !important;
  }
  .card {
    box-shadow: none !important;
    border: 1px solid #cbd5e1 !important;
  }
}