:root {
  --bg: #f5f7fb;
  --panel: #ffffff;
  --panel-soft: #f9fafc;
  --text: #1f2937;
  --muted: #6b7280;
  --border: #e5e7eb;
  --primary: #2563eb;
  --primary-soft: #eff6ff;
  --success: #059669;
  --success-soft: #ecfdf5;
  --warning: #d97706;
  --warning-soft: #fffbeb;
  --danger: #dc2626;
  --danger-soft: #fef2f2;
  --sidebar: #111827;
  --sidebar-soft: #1f2937;
  --shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont,
    "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
}

button,
input,
select,
textarea {
  font: inherit;
}

.hidden {
  display: none !important;
}

.login-screen {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
  background:
    radial-gradient(circle at top left, #dbeafe, transparent 34%),
    radial-gradient(circle at bottom right, #dcfce7, transparent 30%),
    #f8fafc;
}

.login-card {
  width: min(100%, 430px);
  background: #fff;
  border-radius: 24px;
  padding: 34px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}

.login-card h1 {
  margin: 18px 0 8px;
  font-size: 28px;
}

.login-card p {
  color: var(--muted);
  margin: 0 0 26px;
}

.login-card label,
.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 700;
  margin-bottom: 8px;
}

.login-card input,
.form-control {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px 14px;
  outline: none;
  background: #fff;
  color: var(--text);
}

.login-card input:focus,
.form-control:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}

.brand-mark {
  width: 58px;
  height: 58px;
  border-radius: 18px;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, #2563eb, #06b6d4);
  color: #fff;
  font-size: 28px;
  font-weight: 800;
}

.brand-mark.small {
  width: 42px;
  height: 42px;
  border-radius: 13px;
  font-size: 20px;
}

.form-message {
  min-height: 22px;
  margin-top: 14px;
  color: var(--danger);
  font-size: 13px;
}

.app-shell {
  min-height: 100vh;
  display: flex;
}

.sidebar {
  width: 260px;
  background: var(--sidebar);
  color: #fff;
  display: flex;
  flex-direction: column;
  position: fixed;
  inset: 0 auto 0 0;
  z-index: 20;
  transition: transform 0.2s ease;
}

.sidebar-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 22px 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.sidebar-brand strong,
.sidebar-brand span {
  display: block;
}

.sidebar-brand span {
  color: #9ca3af;
  font-size: 12px;
  margin-top: 2px;
}

.nav-menu {
  padding: 18px 12px;
  display: grid;
  gap: 5px;
}

.nav-item {
  border: 0;
  background: transparent;
  color: #d1d5db;
  padding: 12px 14px;
  border-radius: 12px;
  text-align: left;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 11px;
}

.nav-item:hover,
.nav-item.active {
  background: var(--sidebar-soft);
  color: #fff;
}

.sidebar-footer {
  margin-top: auto;
  padding: 18px;
}

.main-content {
  flex: 1;
  min-width: 0;
  margin-left: 260px;
}

.topbar {
  height: 82px;
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 26px;
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(12px);
}

.topbar-left,
.topbar-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

.topbar h2 {
  margin: 0;
  font-size: 20px;
}

.topbar p {
  margin: 3px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.page-container {
  padding: 26px;
}

.icon-button {
  border: 0;
  background: transparent;
  cursor: pointer;
  font-size: 20px;
  padding: 7px;
  border-radius: 9px;
}

.icon-button:hover {
  background: var(--panel-soft);
}

#sidebarToggle {
  display: none;
}

.btn {
  border: 0;
  border-radius: 10px;
  padding: 10px 14px;
  font-weight: 700;
  cursor: pointer;
}

.btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
}

.btn-secondary {
  background: #eef2f7;
  color: var(--text);
}

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

.btn-warning {
  background: var(--warning);
  color: #fff;
}

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

.btn-outline {
  background: #fff;
  border: 1px solid var(--border);
  color: var(--text);
}

.btn-sm {
  padding: 7px 10px;
  font-size: 12px;
}

.btn-block {
  width: 100%;
}

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 18px;
  box-shadow: 0 4px 18px rgba(15, 23, 42, 0.04);
}

.card-header {
  padding: 18px 20px;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

.card-header h3 {
  margin: 0;
  font-size: 16px;
}

.card-body {
  padding: 20px;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 16px;
  margin-bottom: 20px;
}

.stat-card {
  padding: 18px;
}

.stat-label {
  color: var(--muted);
  font-size: 13px;
}

.stat-value {
  font-size: 26px;
  font-weight: 800;
  margin: 8px 0 4px;
}

.stat-help {
  color: var(--muted);
  font-size: 12px;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.table-wrapper {
  overflow: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 760px;
}

th,
td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
  text-align: left;
  font-size: 13px;
  vertical-align: top;
}

th {
  color: var(--muted);
  background: var(--panel-soft);
  position: sticky;
  top: 0;
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 9px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
  white-space: nowrap;
}

.status-badge.success {
  color: var(--success);
  background: var(--success-soft);
}

.status-badge.warning {
  color: var(--warning);
  background: var(--warning-soft);
}

.status-badge.danger {
  color: var(--danger);
  background: var(--danger-soft);
}

.status-badge.neutral {
  color: var(--muted);
  background: #f3f4f6;
}

.action-row {
  display: flex;
  gap: 7px;
  flex-wrap: wrap;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.form-group {
  min-width: 0;
}

.form-group.full {
  grid-column: 1 / -1;
}

textarea.form-control {
  min-height: 120px;
  resize: vertical;
}

.filter-bar {
  display: grid;
  grid-template-columns: repeat(6, minmax(120px, 1fr));
  gap: 10px;
  margin-bottom: 16px;
}

.qr-wrapper {
  display: grid;
  place-items: center;
  min-height: 330px;
  background: #fff;
  border-radius: 14px;
  border: 1px solid var(--border);
}

.qr-wrapper img {
  width: min(100%, 320px);
  height: auto;
}

.empty-state {
  padding: 38px 20px;
  text-align: center;
  color: var(--muted);
}

.toast-container {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 100;
  display: grid;
  gap: 10px;
}

.toast {
  min-width: 280px;
  max-width: 420px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 13px;
  box-shadow: var(--shadow);
  padding: 14px 16px;
}

.toast.success {
  border-left: 4px solid var(--success);
}

.toast.error {
  border-left: 4px solid var(--danger);
}

.modal {
  position: fixed;
  inset: 0;
  z-index: 80;
  display: grid;
  place-items: center;
  padding: 24px;
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(15, 23, 42, 0.56);
}

.modal-card {
  position: relative;
  width: min(100%, 760px);
  max-height: 88vh;
  overflow: auto;
  background: #fff;
  border-radius: 18px;
  box-shadow: var(--shadow);
}

.modal-header {
  padding: 17px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border);
}

.modal-header h3 {
  margin: 0;
}

.modal-body {
  padding: 20px;
}

.code-block {
  background: #111827;
  color: #e5e7eb;
  padding: 15px;
  border-radius: 12px;
  overflow: auto;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 12px;
  white-space: pre-wrap;
}

.chart-bars {
  min-height: 260px;
  display: flex;
  align-items: end;
  gap: 8px;
  padding-top: 18px;
  overflow-x: auto;
}

.chart-column {
  min-width: 28px;
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: end;
  align-items: center;
  gap: 5px;
}

.chart-bar {
  width: 100%;
  max-width: 38px;
  border-radius: 6px 6px 2px 2px;
  background: var(--primary);
  min-height: 3px;
}

.chart-label {
  font-size: 10px;
  color: var(--muted);
  transform: rotate(-45deg);
  margin-top: 13px;
}

.kv-list {
  display: grid;
  gap: 10px;
}

.kv-item {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  border-bottom: 1px dashed var(--border);
  padding-bottom: 9px;
}

.kv-item span:first-child {
  color: var(--muted);
}

@media (max-width: 1180px) {
  .stats-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .filter-bar {
    grid-template-columns: repeat(3, minmax(120px, 1fr));
  }
}

@media (max-width: 860px) {
  .sidebar {
    transform: translateX(-100%);
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .main-content {
    margin-left: 0;
  }

  #sidebarToggle {
    display: inline-grid;
  }

  .grid-2,
  .grid-3,
  .form-grid,
  .stats-grid {
    grid-template-columns: 1fr;
  }

  .filter-bar {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .topbar {
    padding: 0 16px;
  }

  .page-container {
    padding: 16px;
  }
}

@media (max-width: 560px) {
  .topbar-actions .btn {
    display: none;
  }

  .filter-bar {
    grid-template-columns: 1fr;
  }

  .login-card {
    padding: 24px;
  }
}