:root {
  --bg-primary: #0b0f19;
  --bg-secondary: #111827;
  --bg-card: rgba(22, 30, 49, 0.75);
  --bg-card-hover: rgba(30, 41, 67, 0.85);
  --bg-glass: rgba(17, 24, 39, 0.65);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-highlight: rgba(99, 102, 241, 0.3);
  
  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --primary-glow: rgba(99, 102, 241, 0.35);
  --accent: #06b6d4;
  --accent-glow: rgba(6, 182, 212, 0.3);
  --success: #10b981;
  --success-bg: rgba(16, 185, 129, 0.12);
  --warning: #f59e0b;
  --warning-bg: rgba(245, 158, 11, 0.12);
  --danger: #ef4444;
  --danger-bg: rgba(239, 68, 68, 0.12);
  
  --text-main: #f3f4f6;
  --text-muted: #9ca3af;
  --text-dim: #6b7280;
  
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.25);
  --shadow-md: 0 10px 25px -5px rgba(0, 0, 0, 0.4), 0 8px 10px -6px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 25px rgba(99, 102, 241, 0.2);
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.55;
  min-height: 100vh;
  background-image: 
    radial-gradient(circle at 15% 15%, rgba(99, 102, 241, 0.12) 0%, transparent 40%),
    radial-gradient(circle at 85% 85%, rgba(6, 182, 212, 0.1) 0%, transparent 45%),
    radial-gradient(circle at 50% 50%, rgba(16, 185, 129, 0.04) 0%, transparent 60%);
  background-attachment: fixed;
}

/* Header & Navigation */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background: rgba(11, 15, 25, 0.85);
  border-bottom: 1px solid var(--border-color);
  padding: 0.85rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  text-decoration: none;
  color: var(--text-main);
}

.brand-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  box-shadow: var(--shadow-glow);
}

.brand-title {
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
}

.brand-subtitle {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.nav-tab-btn {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-muted);
  padding: 0.5rem 1.1rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-tab-btn:hover {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.04);
}

.nav-tab-btn.active {
  color: var(--primary);
  background: rgba(99, 102, 241, 0.12);
  border-color: rgba(99, 102, 241, 0.3);
}

.user-badge {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.4rem 0.85rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  border-radius: 30px;
  font-size: 0.85rem;
}

.role-tag {
  padding: 0.2rem 0.6rem;
  border-radius: 20px;
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
}
.role-admin {
  background: rgba(245, 158, 11, 0.2);
  color: #fbbf24;
  border: 1px solid rgba(245, 158, 11, 0.4);
}
.role-manager {
  background: rgba(16, 185, 129, 0.2);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.4);
}

.btn-logout {
  background: transparent;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  transition: var(--transition);
  padding: 0.3rem 0.5rem;
  font-size: 0.85rem;
}
.btn-logout:hover {
  color: var(--danger);
}

/* Layout container */
.container {
  max-width: 1380px;
  margin: 1.75rem auto;
  padding: 0 1.5rem;
}

/* Tab contents */
.tab-pane {
  display: none;
  animation: fadeIn 0.3s ease;
}
.tab-pane.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Wizard Screen */
.wizard-layout {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 2rem;
  align-items: start;
}

@media (max-width: 1024px) {
  .wizard-layout {
    grid-template-columns: 1fr;
  }
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  margin-bottom: 1.5rem;
  position: relative;
  overflow: hidden;
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.25rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.85rem;
}

.card-title {
  font-size: 1.15rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--text-main);
}

.step-indicator {
  font-size: 0.8rem;
  color: var(--primary);
  background: rgba(99, 102, 241, 0.12);
  padding: 0.2rem 0.65rem;
  border-radius: 20px;
  font-weight: 600;
}

/* Form Groups & Interactive Chips */
.form-section {
  margin-bottom: 1.6rem;
}

.form-label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 0.65rem;
  color: var(--text-main);
}

.form-subtext {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: -0.3rem;
  margin-bottom: 0.65rem;
}

.options-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 0.75rem;
}

.option-card {
  border: 1px solid var(--border-color);
  background: rgba(255, 255, 255, 0.02);
  border-radius: var(--radius-sm);
  padding: 0.85rem;
  text-align: center;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
}

.option-card:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(255, 255, 255, 0.15);
}

.option-card.selected {
  background: rgba(99, 102, 241, 0.15);
  border-color: var(--primary);
  box-shadow: 0 0 16px rgba(99, 102, 241, 0.25);
}

.option-icon {
  font-size: 1.6rem;
  margin-bottom: 0.4rem;
}

.option-name {
  font-size: 0.85rem;
  font-weight: 600;
}

.option-desc {
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: 0.2rem;
}

/* Checkboxes toggle switches */
.checkbox-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.checkbox-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition);
}

.checkbox-item:hover {
  background: rgba(255, 255, 255, 0.05);
}

.checkbox-item.checked {
  border-color: var(--accent);
  background: rgba(6, 182, 212, 0.08);
}

.checkbox-left {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.checkbox-subselect {
  padding-left: 2.2rem;
  margin-top: 0.5rem;
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

select.form-select {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 0.45rem 0.85rem;
  border-radius: var(--radius-sm);
  outline: none;
  font-size: 0.85rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.4rem;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: var(--transition);
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), #4f46e5);
  color: #fff;
  box-shadow: 0 4px 14px var(--primary-glow);
}

.btn-primary:hover {
  filter: brightness(1.1);
  transform: translateY(-1px);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-color);
  color: var(--text-main);
}
.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
}

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

.btn-block {
  width: 100%;
}

/* Result proposal display */
.results-panel {
  position: sticky;
  top: 5rem;
}

.equipment-badge {
  display: inline-block;
  font-size: 0.75rem;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  background: rgba(99, 102, 241, 0.2);
  color: #a5b4fc;
  font-weight: 600;
  margin-bottom: 0.4rem;
}

.equipment-item-card {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--primary);
  border-radius: var(--radius-sm);
  padding: 1rem 1.15rem;
  margin-bottom: 0.85rem;
  transition: var(--transition);
}
.equipment-item-card:hover {
  background: rgba(255, 255, 255, 0.05);
  border-left-color: var(--accent);
}

.equipment-name {
  font-weight: 600;
  font-size: 0.98rem;
  margin-bottom: 0.25rem;
  color: #fff;
}

.equipment-codes {
  font-size: 0.8rem;
  color: var(--accent);
  display: flex;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
}

.equipment-features {
  list-style: none;
  font-size: 0.82rem;
  color: var(--text-muted);
}
.equipment-features li {
  position: relative;
  padding-left: 1rem;
  margin-bottom: 0.2rem;
}
.equipment-features li::before {
  content: "•";
  position: absolute;
  left: 0;
  color: var(--primary);
}

/* Advice & Warnings */
.alert-box {
  padding: 0.85rem 1.1rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  margin-bottom: 1rem;
  display: flex;
  gap: 0.6rem;
  align-items: flex-start;
}

.alert-warning {
  background: var(--warning-bg);
  border: 1px solid rgba(245, 158, 11, 0.3);
  color: #fde68a;
}

.alert-tip {
  background: rgba(99, 102, 241, 0.1);
  border: 1px solid rgba(99, 102, 241, 0.3);
  color: #c7d2fe;
}

/* Chat Assistant Panel */
.chat-container {
  display: flex;
  flex-direction: column;
  height: 520px;
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.chat-bubble {
  max-width: 85%;
  padding: 0.85rem 1.1rem;
  border-radius: var(--radius-md);
  font-size: 0.88rem;
  line-height: 1.45;
}

.chat-bubble.user {
  align-self: flex-end;
  background: linear-gradient(135deg, var(--primary), #4338ca);
  color: #fff;
  border-bottom-right-radius: 4px;
}

.chat-bubble.bot {
  align-self: flex-start;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  border-bottom-left-radius: 4px;
  color: var(--text-main);
}

.chat-input-row {
  display: flex;
  gap: 0.5rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border-color);
}

.chat-input {
  flex: 1;
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 0.65rem 1rem;
  border-radius: var(--radius-sm);
  outline: none;
  font-size: 0.9rem;
}
.chat-input:focus {
  border-color: var(--primary);
}

/* Catalog Table & Search */
.catalog-toolbar {
  display: flex;
  gap: 1rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.search-input {
  flex: 1;
  min-width: 250px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 0.65rem 1rem;
  border-radius: var(--radius-sm);
  color: var(--text-main);
  outline: none;
  font-size: 0.9rem;
}

.catalog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.25rem;
}

.catalog-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  transition: var(--transition);
}
.catalog-card:hover {
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.catalog-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 0.5rem;
}

.badge-pm {
  background: rgba(16, 185, 129, 0.15);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.3);
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 600;
}

.badge-cn {
  background: rgba(6, 182, 212, 0.15);
  color: #38bdf8;
  border: 1px solid rgba(6, 182, 212, 0.3);
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 600;
}

/* Login Page Styling */
.login-wrapper {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 85vh;
}

.login-card {
  width: 100%;
  max-width: 440px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  box-shadow: var(--shadow-md), var(--shadow-glow);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.login-header {
  text-align: center;
  margin-bottom: 2rem;
}

.form-input {
  width: 100%;
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  outline: none;
  font-size: 0.95rem;
  margin-bottom: 1.25rem;
  transition: var(--transition);
}
.form-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 12px var(--primary-glow);
}

/* Admin Dashboard */
.admin-tips-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 1rem;
}
.admin-tips-table th, .admin-tips-table td {
  padding: 0.85rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}
.admin-tips-table th {
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* Print/Commercial Proposal Export */
@media print {
  body {
    background: #fff !important;
    color: #000 !important;
  }
  .navbar, .wizard-form-card, .chat-container, .btn, .nav-links {
    display: none !important;
  }
  .results-panel {
    position: static !important;
    width: 100% !important;
  }
  .card {
    border: 1px solid #ddd !important;
    box-shadow: none !important;
    background: #fff !important;
  }
}