/* Premium Modern Dark Theme Design System for Logistics AI System */
@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700&family=Inter:wght@300;400;500;600;700&display=swap');

:root {
  --bg-primary: #0b0f19;
  --bg-secondary: #111827;
  --bg-card: rgba(17, 24, 39, 0.75);
  --bg-hover: rgba(31, 41, 55, 0.8);
  --accent-blue: #3b82f6;
  --accent-purple: #8b5cf6;
  --accent-teal: #14b8a6;
  --accent-emerald: #10b981;
  --gradient-main: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 50%, #ec4899 100%);
  --gradient-glow: linear-gradient(135deg, rgba(59, 130, 246, 0.15) 0%, rgba(139, 92, 246, 0.15) 100%);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-highlight: rgba(139, 92, 246, 0.3);
  --text-primary: #f9fafb;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --shadow-glow: 0 10px 30px -10px rgba(139, 92, 246, 0.3);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

.admin-only {
  display: none !important;
}

/* Header & Top Bar */
.app-header {
  background: rgba(11, 15, 25, 0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
  padding: 0.75rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

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

.brand-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: var(--gradient-main);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  box-shadow: var(--shadow-glow);
}

.brand-title h1 {
  font-family: 'Outfit', sans-serif;
  font-size: 1.25rem;
  font-weight: 700;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-title p {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.model-selector-badge {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 0.4rem 0.8rem;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
}

.select-input {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-sm);
  outline: none;
  font-size: 0.85rem;
  cursor: pointer;
}

.select-input:focus {
  border-color: var(--accent-purple);
}

.btn-icon {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.45rem 0.85rem;
  border-radius: var(--radius-md);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  font-weight: 500;
  transition: all 0.2s ease;
}

.btn-icon:hover {
  background: var(--bg-hover);
  border-color: var(--accent-purple);
  box-shadow: var(--shadow-glow);
}

/* Tabs Navigation */
.tabs-nav {
  display: flex;
  gap: 0.5rem;
  background: rgba(17, 24, 39, 0.5);
  padding: 0.25rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

.tab-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  padding: 0.5rem 1.25rem;
  border-radius: var(--radius-sm);
  font-weight: 500;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: all 0.2s ease;
}

.tab-btn.active {
  background: var(--accent-purple);
  color: #fff;
  box-shadow: 0 4px 12px rgba(139, 92, 246, 0.4);
}

.tab-btn:hover:not(.active) {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.05);
}

/* Main Container Layout */
.main-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: 1.5rem 2rem;
  max-width: 1400px;
  width: 100%;
  margin: 0 auto;
}

.tab-content {
  display: none;
  flex: 1;
}

.tab-content.active {
  display: flex;
  flex-direction: column;
}

/* Chat Component */
.chat-wrapper {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 1.5rem;
  height: calc(100vh - 140px);
}

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

.chat-main {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  backdrop-filter: blur(12px);
}

.chat-messages {
  flex: 1;
  padding: 1.5rem;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.message {
  display: flex;
  gap: 1rem;
  max-width: 85%;
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

.message.user {
  align-self: flex-end;
  flex-direction: row-reverse;
}

.avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--bg-hover);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 0.9rem;
}

.message.user .avatar {
  background: var(--accent-blue);
}

.message.bot .avatar {
  background: var(--gradient-main);
}

.message-body {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 1rem 1.25rem;
  border-radius: var(--radius-md);
  line-height: 1.6;
  font-size: 0.95rem;
}

.message.user .message-body {
  background: rgba(59, 130, 246, 0.15);
  border-color: rgba(59, 130, 246, 0.3);
}

.source-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border-color);
}

.source-badge {
  background: rgba(139, 92, 246, 0.15);
  border: 1px solid var(--border-highlight);
  color: #c084fc;
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  cursor: pointer;
  transition: all 0.2s;
}

.source-badge:hover {
  background: rgba(139, 92, 246, 0.3);
}

.chat-input-area {
  padding: 1rem;
  border-top: 1px solid var(--border-color);
  background: rgba(11, 15, 25, 0.5);
}

.chat-input-box {
  display: flex;
  gap: 0.75rem;
}

.chat-textarea {
  flex: 1;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.75rem 1rem;
  color: var(--text-primary);
  resize: none;
  outline: none;
  font-size: 0.95rem;
  height: 48px;
}

.chat-textarea:focus {
  border-color: var(--accent-purple);
}

.btn-primary {
  background: var(--gradient-main);
  color: #fff;
  border: none;
  padding: 0 1.5rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  box-shadow: var(--shadow-glow);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-primary:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}

.sidebar-panel {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.sidebar-title {
  font-family: 'Outfit', sans-serif;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.quick-prompts {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.prompt-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 0.75rem;
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s;
}

.prompt-card:hover {
  border-color: var(--accent-blue);
  color: var(--text-primary);
  background: var(--bg-hover);
}

/* Quiz Builder Component */
.quiz-container {
  display: grid;
  grid-template-columns: 360px 1fr;
  gap: 1.5rem;
  height: calc(100vh - 140px);
}

@media (max-width: 900px) {
  .quiz-container {
    grid-template-columns: 1fr;
  }
}

.quiz-config-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  overflow-y: auto;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-group label {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.form-input {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.65rem 0.85rem;
  border-radius: var(--radius-sm);
  outline: none;
  font-size: 0.9rem;
}

.form-input:focus {
  border-color: var(--accent-purple);
}

.quiz-display-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
}

.quiz-item {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  margin-bottom: 1.25rem;
}

.quiz-item h3 {
  font-size: 1.05rem;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.quiz-opt-btn {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  text-align: left;
  cursor: pointer;
  transition: all 0.2s;
  font-size: 0.9rem;
}

.quiz-opt-btn:hover {
  border-color: var(--accent-blue);
  background: rgba(59, 130, 246, 0.1);
}

.quiz-opt-btn.correct {
  background: rgba(16, 185, 129, 0.2) !important;
  border-color: var(--accent-emerald) !important;
  color: #34d399 !important;
}

.quiz-opt-btn.wrong {
  background: rgba(239, 68, 68, 0.2) !important;
  border-color: #ef4444 !important;
  color: #f87171 !important;
}

.quiz-explanation {
  margin-top: 1rem;
  padding: 0.85rem;
  background: rgba(139, 92, 246, 0.1);
  border: 1px dashed var(--accent-purple);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  color: #d8b4fe;
}

/* Library Component */
.library-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.25rem;
  margin-top: 1rem;
}

.book-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  transition: all 0.2s;
}

.book-card:hover {
  border-color: var(--accent-purple);
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

.book-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: rgba(139, 92, 246, 0.15);
  color: var(--accent-purple);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  flex-shrink: 0;
}

.book-info h4 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.35rem;
  line-height: 1.3;
}

.book-info p {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

/* Modal Overlay & Settings Dialog */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: all 0.25s ease;
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-card {
  background: #111827;
  border: 1px solid var(--border-highlight);
  border-radius: var(--radius-lg);
  width: 90%;
  max-width: 640px;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.6);
  animation: modalPop 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  overflow: hidden;
}

@keyframes modalPop {
  from { transform: scale(0.92) translateY(20px); opacity: 0; }
  to { transform: scale(1) translateY(0); opacity: 1; }
}

.modal-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(17, 24, 39, 0.8);
}

.modal-header h3 {
  font-family: 'Outfit', sans-serif;
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.modal-close-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 1.2rem;
  padding: 0.25rem;
  border-radius: 50%;
  transition: all 0.2s;
}

.modal-close-btn:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.1);
}

.modal-body {
  padding: 1.5rem;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.setting-field {
  background: rgba(31, 41, 55, 0.4);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.setting-title-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.setting-title-row label {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-primary);
}

.setting-desc {
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.45;
}

.setting-impact {
  font-size: 0.78rem;
  color: #c084fc;
  background: rgba(139, 92, 246, 0.1);
  padding: 0.4rem 0.6rem;
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--accent-purple);
  margin-top: 0.25rem;
}

.modal-footer {
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
  background: rgba(17, 24, 39, 0.8);
}

/* Spinner Loader */
.spinner {
  width: 20px;
  height: 20px;
  border: 3px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top-color: #fff;
  animation: spin 0.8s linear infinite;
}

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

/* Auth Modal Tabs Styling */
.auth-tab-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  padding: 0.5rem 1rem;
  font-size: 0.85rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.auth-tab-btn:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.08);
}
.auth-tab-btn.active {
  background: var(--gradient-main);
  color: #ffffff !important;
  font-weight: 600;
  box-shadow: 0 2px 10px rgba(59, 130, 246, 0.35);
}