/* =============================================================================
   PetroManager — Design System
   Corporate petrol station management UI
   Palette: Navy / White / Gold / Steel Blue
   Typography: Inter (data), Roboto Mono (numbers)
   ============================================================================= */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Roboto+Mono:wght@400;500&display=swap');

/* ── CSS Variables ────────────────────────────────────────────────────────── */
:root {
  /* Brand */
  --navy:          #1B3A5C;
  --navy-dark:     #122840;
  --navy-light:    #243F63;
  --gold:          #C9A84C;
  --gold-light:    #E8C96A;
  --steel:         #2E75B6;
  --steel-light:   #4A90D9;

  /* Neutrals */
  --white:         #FFFFFF;
  --bg:            #F4F6F9;
  --surface:       #FFFFFF;
  --border:        #E2E8F0;
  --border-dark:   #CBD5E0;

  /* Text */
  --text-primary:  #1A202C;
  --text-secondary:#4A5568;
  --text-muted:    #718096;
  --text-inverse:  #FFFFFF;

  /* Status */
  --success:       #2F855A;
  --success-bg:    #F0FFF4;
  --warning:       #C05621;
  --warning-bg:    #FFFAF0;
  --danger:        #C53030;
  --danger-bg:     #FFF5F5;
  --info:          #2B6CB0;
  --info-bg:       #EBF8FF;

  /* Layout */
  --sidebar-w:     240px;
  --sidebar-collapsed: 64px;
  --topbar-h:      60px;
  --radius:        6px;
  --radius-lg:     10px;

  /* Shadows */
  --shadow-sm:     0 1px 3px rgba(0,0,0,0.08);
  --shadow:        0 2px 8px rgba(0,0,0,0.10);
  --shadow-lg:     0 4px 20px rgba(0,0,0,0.12);

  /* Typography */
  --font:          'Inter', sans-serif;
  --font-mono:     'Roboto Mono', monospace;

  /* Transitions */
  --transition:    0.2s ease;
}

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

html { font-size: 14px; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text-primary);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--steel); text-decoration: none; }
a:hover { color: var(--steel-light); }

button { cursor: pointer; font-family: var(--font); }
input, select, textarea { font-family: var(--font); }

/* ── App Shell ───────────────────────────────────────────────────────────── */
.app {
  display: flex;
  min-height: 100vh;
}

/* ── Sidebar ─────────────────────────────────────────────────────────────── */
.sidebar {
  width: var(--sidebar-w);
  background: var(--navy);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0; left: 0; bottom: 0;
  z-index: 100;
  transition: width var(--transition);
  overflow: hidden;
}

.sidebar.collapsed { width: var(--sidebar-collapsed); }

.sidebar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 18px;
  height: var(--topbar-h);
  border-bottom: 1px solid rgba(255,255,255,0.08);
  flex-shrink: 0;
}

.sidebar-brand-icon {
  width: 32px; height: 32px;
  background: var(--gold);
  border-radius: 6px;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  font-weight: 700;
  font-size: 14px;
  color: var(--navy);
  letter-spacing: -0.5px;
}

.sidebar-brand-name {
  font-size: 15px;
  font-weight: 700;
  color: var(--white);
  white-space: nowrap;
  letter-spacing: 0.3px;
}

.sidebar-brand-name span {
  color: var(--gold);
}

.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: 12px 0;
}

.sidebar-nav::-webkit-scrollbar { width: 3px; }
.sidebar-nav::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.15); border-radius: 3px; }

.nav-section-label {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: rgba(255,255,255,0.35);
  padding: 16px 18px 6px;
  white-space: nowrap;
}

.sidebar.collapsed .nav-section-label { opacity: 0; }

.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 18px;
  color: rgba(255,255,255,0.65);
  font-size: 13.5px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
  border-left: 3px solid transparent;
  text-decoration: none;
}

.nav-item:hover {
  color: var(--white);
  background: rgba(255,255,255,0.06);
  border-left-color: rgba(201,168,76,0.4);
}

.nav-item.active {
  color: var(--white);
  background: rgba(255,255,255,0.10);
  border-left-color: var(--gold);
}

.nav-item svg {
  width: 18px; height: 18px;
  flex-shrink: 0;
  opacity: 0.8;
}

.nav-item.active svg { opacity: 1; }

.nav-item-label { white-space: nowrap; }
.sidebar.collapsed .nav-item-label { display: none; }

.sidebar-footer {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding: 12px 0;
}

/* ── Topbar ──────────────────────────────────────────────────────────────── */
.topbar {
  position: fixed;
  top: 0;
  left: var(--sidebar-w);
  right: 0;
  height: var(--topbar-h);
  background: var(--white);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  z-index: 90;
  transition: left var(--transition);
  box-shadow: var(--shadow-sm);
}

.sidebar.collapsed ~ .main-area .topbar {
  left: var(--sidebar-collapsed);
}

.topbar-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.topbar-toggle {
  width: 32px; height: 32px;
  display: flex; align-items: center; justify-content: center;
  border: none;
  background: transparent;
  border-radius: var(--radius);
  color: var(--text-secondary);
  transition: all var(--transition);
}

.topbar-toggle:hover {
  background: var(--bg);
  color: var(--text-primary);
}

.topbar-page-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
}

.topbar-station-selector {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 5px 10px;
  font-size: 13px;
  color: var(--text-secondary);
  cursor: pointer;
}

.topbar-station-selector select {
  border: none;
  background: transparent;
  font-size: 13px;
  color: var(--text-primary);
  font-weight: 500;
  cursor: pointer;
  outline: none;
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

.topbar-btn {
  width: 36px; height: 36px;
  display: flex; align-items: center; justify-content: center;
  border: none;
  background: transparent;
  border-radius: var(--radius);
  color: var(--text-secondary);
  transition: all var(--transition);
  position: relative;
}

.topbar-btn:hover {
  background: var(--bg);
  color: var(--text-primary);
}

.badge {
  position: absolute;
  top: 4px; right: 4px;
  width: 8px; height: 8px;
  background: var(--danger);
  border-radius: 50%;
  border: 2px solid var(--white);
}

.user-menu {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 8px 4px 4px;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background var(--transition);
}

.user-menu:hover { background: var(--bg); }

.user-avatar {
  width: 32px; height: 32px;
  border-radius: 50%;
  background: var(--navy);
  color: var(--white);
  display: flex; align-items: center; justify-content: center;
  font-size: 12px;
  font-weight: 600;
  flex-shrink: 0;
}

.user-info { line-height: 1.2; }
.user-name { font-size: 13px; font-weight: 600; color: var(--text-primary); }
.user-role { font-size: 11px; color: var(--text-muted); text-transform: capitalize; }

/* ── Main Content ─────────────────────────────────────────────────────────── */
.main-area {
  margin-left: var(--sidebar-w);
  flex: 1;
  min-height: 100vh;
  transition: margin-left var(--transition);
  display: flex;
  flex-direction: column;
}

.sidebar.collapsed ~ .main-area { margin-left: var(--sidebar-collapsed); }

.main-content {
  margin-top: var(--topbar-h);
  padding: 24px;
  flex: 1;
}

/* ── Page Header ─────────────────────────────────────────────────────────── */
.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}

.page-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
}

.page-subtitle {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 2px;
}

/* ── Cards ───────────────────────────────────────────────────────────────── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
}

.card-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
}

.card-body { padding: 20px; }

/* ── KPI Cards ───────────────────────────────────────────────────────────── */
.kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

.kpi-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.kpi-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--steel);
}

.kpi-card.gold::before  { background: var(--gold); }
.kpi-card.green::before { background: var(--success); }
.kpi-card.red::before   { background: var(--danger); }

.kpi-label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.kpi-value {
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 500;
  color: var(--text-primary);
  line-height: 1;
  margin-bottom: 8px;
}

.kpi-meta {
  font-size: 12px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 4px;
}

.kpi-icon {
  position: absolute;
  top: 16px; right: 16px;
  width: 36px; height: 36px;
  border-radius: var(--radius);
  display: flex; align-items: center; justify-content: center;
  background: var(--bg);
}

.kpi-icon svg { width: 18px; height: 18px; color: var(--text-muted); }

.trend-up   { color: var(--success); }
.trend-down { color: var(--danger); }

/* ── Grid Layouts ────────────────────────────────────────────────────────── */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.grid-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 16px; }
.grid-3-1 { display: grid; grid-template-columns: 3fr 1fr; gap: 16px; }
.grid-2-1 { display: grid; grid-template-columns: 2fr 1fr; gap: 16px; }

/* ── Tables ──────────────────────────────────────────────────────────────── */
.table-wrap {
  overflow-x: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

table {
  width: 100%;
  border-collapse: collapse;
  background: var(--surface);
  font-size: 13px;
}

thead th {
  background: var(--bg);
  padding: 10px 14px;
  text-align: left;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.4px;
  text-transform: uppercase;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

tbody td {
  padding: 11px 14px;
  border-bottom: 1px solid var(--border);
  color: var(--text-primary);
  vertical-align: middle;
}

tbody tr:last-child td { border-bottom: none; }
tbody tr:hover { background: rgba(46,117,182,0.03); }

.td-mono {
  font-family: var(--font-mono);
  font-size: 12px;
}

.td-muted { color: var(--text-muted); font-size: 12px; }

/* ── Buttons ─────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  border-radius: var(--radius);
  font-size: 13px;
  font-weight: 500;
  border: 1px solid transparent;
  transition: all var(--transition);
  white-space: nowrap;
  cursor: pointer;
}

.btn svg { width: 15px; height: 15px; }

.btn-primary {
  background: var(--navy);
  color: var(--white);
  border-color: var(--navy);
}
.btn-primary:hover { background: var(--navy-dark); }

.btn-gold {
  background: var(--gold);
  color: var(--navy);
  border-color: var(--gold);
  font-weight: 600;
}
.btn-gold:hover { background: var(--gold-light); }

.btn-steel {
  background: var(--steel);
  color: var(--white);
  border-color: var(--steel);
}
.btn-steel:hover { background: var(--steel-light); }

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border-color: var(--border-dark);
}
.btn-outline:hover { background: var(--bg); }

.btn-danger {
  background: var(--danger);
  color: var(--white);
  border-color: var(--danger);
}

.btn-sm { padding: 4px 10px; font-size: 12px; }
.btn-lg { padding: 10px 20px; font-size: 14px; }

/* ── Forms ───────────────────────────────────────────────────────────────── */
.form-group { margin-bottom: 16px; }

.form-label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 5px;
  text-transform: uppercase;
  letter-spacing: 0.4px;
}

.form-control {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--border-dark);
  border-radius: var(--radius);
  font-size: 13px;
  color: var(--text-primary);
  background: var(--white);
  transition: border-color var(--transition);
  outline: none;
}

.form-control:focus {
  border-color: var(--steel);
  box-shadow: 0 0 0 3px rgba(46,117,182,0.12);
}

.form-control::placeholder { color: var(--text-muted); }

select.form-control { cursor: pointer; }

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.form-error {
  font-size: 11px;
  color: var(--danger);
  margin-top: 4px;
}

.form-hint {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ── Badges / Pills ──────────────────────────────────────────────────────── */
.pill {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 8px;
  border-radius: 20px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.3px;
}

.pill-green  { background: var(--success-bg); color: var(--success); }
.pill-red    { background: var(--danger-bg);  color: var(--danger); }
.pill-gold   { background: #FFFBEB;           color: #92400E; }
.pill-blue   { background: var(--info-bg);    color: var(--info); }
.pill-grey   { background: var(--bg);         color: var(--text-muted); }

/* ── Alerts ──────────────────────────────────────────────────────────────── */
.alert {
  padding: 12px 16px;
  border-radius: var(--radius);
  font-size: 13px;
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 16px;
}

.alert svg { width: 16px; height: 16px; flex-shrink: 0; margin-top: 1px; }
.alert-warning { background: var(--warning-bg); color: var(--warning); border: 1px solid #FBD38D; }
.alert-danger  { background: var(--danger-bg);  color: var(--danger);  border: 1px solid #FC8181; }
.alert-success { background: var(--success-bg); color: var(--success); border: 1px solid #9AE6B4; }
.alert-info    { background: var(--info-bg);    color: var(--info);    border: 1px solid #90CDF4; }

/* ── Stock Gauge ─────────────────────────────────────────────────────────── */
.stock-bar {
  height: 6px;
  background: var(--border);
  border-radius: 3px;
  overflow: hidden;
  margin-top: 6px;
}

.stock-bar-fill {
  height: 100%;
  border-radius: 3px;
  transition: width 0.4s ease;
  background: var(--success);
}

.stock-bar-fill.medium { background: var(--gold); }
.stock-bar-fill.low    { background: var(--danger); }

/* ── Pump Status Grid ────────────────────────────────────────────────────── */
.pump-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 12px;
}

.pump-card {
  border: 2px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 16px;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition);
}

.pump-card.active   { border-color: var(--success); background: var(--success-bg); }
.pump-card.maintenance { border-color: var(--gold); background: #FFFBEB; }
.pump-card.offline  { border-color: var(--border-dark); background: var(--bg); opacity: 0.6; }

.pump-number {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-primary);
  font-family: var(--font-mono);
}

.pump-fuel { font-size: 11px; color: var(--text-muted); margin-top: 2px; }
.pump-status-label { font-size: 11px; font-weight: 600; margin-top: 8px; }
.pump-card.active .pump-status-label { color: var(--success); }
.pump-card.maintenance .pump-status-label { color: #92400E; }
.pump-card.offline .pump-status-label { color: var(--text-muted); }

/* ── Modal ───────────────────────────────────────────────────────────────── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  padding: 20px;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
}

.modal-overlay.open {
  opacity: 1;
  pointer-events: all;
}

.modal {
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 520px;
  max-height: 90vh;
  overflow-y: auto;
  transform: translateY(10px);
  transition: transform var(--transition);
}

.modal-overlay.open .modal { transform: translateY(0); }

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 20px;
  border-bottom: 1px solid var(--border);
}

.modal-title { font-size: 15px; font-weight: 700; }

.modal-close {
  width: 28px; height: 28px;
  border: none; background: var(--bg);
  border-radius: var(--radius);
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  color: var(--text-muted);
}

.modal-body { padding: 20px; }

.modal-footer {
  padding: 14px 20px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: flex-end;
  gap: 8px;
}

/* ── Toast Notifications ─────────────────────────────────────────────────── */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 300;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toast {
  background: var(--navy);
  color: var(--white);
  padding: 12px 16px;
  border-radius: var(--radius);
  font-size: 13px;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 280px;
  max-width: 380px;
  animation: slideIn 0.2s ease;
  border-left: 4px solid var(--gold);
}

.toast.success { border-left-color: var(--success); }
.toast.error   { border-left-color: var(--danger); }
.toast.warning { border-left-color: var(--gold); }

@keyframes slideIn {
  from { transform: translateX(100%); opacity: 0; }
  to   { transform: translateX(0);    opacity: 1; }
}

/* ── Tabs ────────────────────────────────────────────────────────────────── */
.tabs {
  display: flex;
  border-bottom: 2px solid var(--border);
  margin-bottom: 20px;
  gap: 0;
}

.tab {
  padding: 10px 18px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-muted);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  transition: all var(--transition);
  white-space: nowrap;
}

.tab:hover { color: var(--text-primary); }
.tab.active { color: var(--navy); border-bottom-color: var(--navy); font-weight: 600; }

.tab-content { display: none; }
.tab-content.active { display: block; }

/* ── Pagination ──────────────────────────────────────────────────────────── */
.pagination {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-top: 1px solid var(--border);
  font-size: 12px;
  color: var(--text-muted);
}

.pagination-btns { display: flex; gap: 4px; }

.page-btn {
  width: 30px; height: 30px;
  display: flex; align-items: center; justify-content: center;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--white);
  font-size: 12px;
  cursor: pointer;
  transition: all var(--transition);
}

.page-btn:hover  { background: var(--bg); }
.page-btn.active { background: var(--navy); color: var(--white); border-color: var(--navy); }
.page-btn:disabled { opacity: 0.4; cursor: not-allowed; }

/* ── Loading ─────────────────────────────────────────────────────────────── */
.spinner {
  width: 20px; height: 20px;
  border: 2px solid var(--border);
  border-top-color: var(--steel);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  display: inline-block;
}

@keyframes spin { to { transform: rotate(360deg); } }

.loading-overlay {
  position: absolute;
  inset: 0;
  background: rgba(255,255,255,0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: inherit;
  z-index: 10;
}

.empty-state {
  text-align: center;
  padding: 48px 20px;
  color: var(--text-muted);
}

.empty-state svg {
  width: 48px; height: 48px;
  margin-bottom: 12px;
  opacity: 0.3;
}

.empty-state p { font-size: 13px; }

/* ── Divider ─────────────────────────────────────────────────────────────── */
.divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 16px 0;
}

/* ── Utility ─────────────────────────────────────────────────────────────── */
.flex         { display: flex; }
.flex-center  { display: flex; align-items: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.gap-8        { gap: 8px; }
.gap-12       { gap: 12px; }
.gap-16       { gap: 16px; }
.mt-8         { margin-top: 8px; }
.mt-16        { margin-top: 16px; }
.mt-24        { margin-top: 24px; }
.mb-16        { margin-bottom: 16px; }
.mb-24        { margin-bottom: 24px; }
.text-right   { text-align: right; }
.text-center  { text-align: center; }
.text-muted   { color: var(--text-muted); }
.text-sm      { font-size: 12px; }
.font-mono    { font-family: var(--font-mono); }
.font-bold    { font-weight: 700; }
.w-full       { width: 100%; }

/* ── Responsive ──────────────────────────────────────────────────────────── */
@media (max-width: 1024px) {
  .grid-3   { grid-template-columns: 1fr 1fr; }
  .grid-3-1 { grid-template-columns: 1fr; }
  .grid-2-1 { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .sidebar { width: var(--sidebar-collapsed); }
  .sidebar .nav-item-label,
  .sidebar .nav-section-label,
  .sidebar .sidebar-brand-name { display: none; }
  .main-area { margin-left: var(--sidebar-collapsed); }
  .topbar { left: var(--sidebar-collapsed); }
  .grid-2 { grid-template-columns: 1fr; }
  .kpi-grid { grid-template-columns: 1fr 1fr; }
  .main-content { padding: 16px; }
  .form-row { grid-template-columns: 1fr; }
}