@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

:root {
  --bg-primary: #f5f7fb;
  --bg-secondary: #ffffff;
  --bg-card: #ffffff;
  --bg-card-hover: #f0f4ff;
  --text-primary: #1a2240;
  --text-secondary: #4a5578;
  --text-muted: #8892a8;
  --accent: #2563eb;
  --accent-light: #3b82f6;
  --accent-glow: rgba(37, 99, 235, 0.2);
  --accent-bg: rgba(37, 99, 235, 0.06);
  --success: #16a34a;
  --success-bg: rgba(22, 163, 74, 0.1);
  --warning: #d97706;
  --warning-bg: rgba(217, 119, 6, 0.1);
  --danger: #dc2626;
  --danger-bg: rgba(220, 38, 38, 0.1);
  --border: #e2e8f0;
  --border-hover: rgba(37, 99, 235, 0.4);
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.06), 0 4px 12px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 4px 24px rgba(0, 0, 0, 0.08);
  --radius: 12px;
  --radius-lg: 16px;
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ============ SCROLLBAR ============ */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
  background: #c5cee0;
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--accent);
}

/* ============ ANIMATIONS ============ */
@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

@keyframes pulse {

  0%,
  100% {
    opacity: 1;
  }

  50% {
    opacity: 0.5;
  }
}

@keyframes spin {
  from {
    transform: rotate(0deg);
  }

  to {
    transform: rotate(360deg);
  }
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(30px);
  }

  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* ============ AUTH PAGE ============ */
.auth-container {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 20px;
  background: linear-gradient(135deg, #e8f0fe 0%, #f5f7fb 50%, #dbeafe 100%);
}

.auth-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 48px;
  width: 100%;
  max-width: 440px;
  box-shadow: var(--shadow-lg);
  animation: slideUp 0.6s ease;
}

.auth-logo {
  text-align: center;
  margin-bottom: 8px;
}

.auth-logo .logo-icon {
  font-size: 48px;
  margin-bottom: 12px;
  display: block;
}

.auth-logo h1 {
  font-size: 24px;
  font-weight: 700;
  color: var(--accent);
}

.auth-logo p {
  color: var(--text-secondary);
  font-size: 14px;
  margin-top: 4px;
}

.auth-tabs {
  display: flex;
  margin: 28px 0 24px;
  border-bottom: 2px solid var(--border);
  gap: 0;
}

.auth-tab {
  flex: 1;
  padding: 12px;
  text-align: center;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  transition: var(--transition);
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  background: none;
  border-top: none;
  border-left: none;
  border-right: none;
}

.auth-tab:hover {
  color: var(--text-secondary);
}

.auth-tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.auth-form {
  display: none;
}

.auth-form.active {
  display: block;
  animation: fadeIn 0.3s ease;
}

/* ============ FORM ELEMENTS ============ */
.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 6px;
  letter-spacing: 0.3px;
}

.form-input {
  width: 100%;
  padding: 12px 16px;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-primary);
  font-family: 'Inter', sans-serif;
  font-size: 14px;
  transition: var(--transition);
  outline: none;
}

.form-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  font-family: 'Inter', sans-serif;
  font-size: 14px;
  font-weight: 600;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent);
  color: white;
  width: 100%;
}

.btn-primary:hover {
  background: #1d4ed8;
  transform: translateY(-1px);
  box-shadow: 0 4px 14px var(--accent-glow);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.btn-secondary {
  background: var(--bg-primary);
  color: var(--text-primary);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-bg);
}

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

.btn-success:hover {
  background: #15803d;
  transform: translateY(-1px);
}

.btn-danger {
  background: var(--danger);
  color: white;
  padding: 6px 12px;
  font-size: 12px;
}

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

.btn-sm {
  padding: 8px 16px;
  font-size: 13px;
}

.btn-icon {
  padding: 8px;
  border-radius: 6px;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-muted);
  cursor: pointer;
  transition: var(--transition);
}

.btn-icon:hover {
  color: var(--danger);
  border-color: var(--danger);
  background: var(--danger-bg);
}

.alert {
  padding: 12px 16px;
  border-radius: 8px;
  font-size: 13px;
  margin-bottom: 16px;
  display: none;
}

.alert-error {
  background: var(--danger-bg);
  color: var(--danger);
  border: 1px solid rgba(220, 38, 38, 0.2);
}

.alert-success {
  background: var(--success-bg);
  color: var(--success);
  border: 1px solid rgba(22, 163, 74, 0.2);
}

/* ============ NAVBAR ============ */
.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 32px;
  background: #ffffff;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.04);
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
}

.navbar-brand span {
  color: var(--accent);
}

.navbar-user {
  display: flex;
  align-items: center;
  gap: 16px;
}

.navbar-user .user-email {
  font-size: 13px;
  color: var(--text-secondary);
}

.navbar-user .btn-logout {
  padding: 8px 16px;
  font-size: 13px;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  border-radius: 6px;
  cursor: pointer;
  transition: var(--transition);
  font-family: 'Inter', sans-serif;
}

.navbar-user .btn-logout:hover {
  border-color: var(--danger);
  color: var(--danger);
  background: var(--danger-bg);
}

/* ============ DASHBOARD ============ */
.dashboard {
  max-width: 1200px;
  margin: 0 auto;
  padding: 32px;
}

.dashboard-header {
  margin-bottom: 32px;
}

.dashboard-header h2 {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.dashboard-header p {
  color: var(--text-secondary);
  font-size: 15px;
}

.dashboard-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-bottom: 32px;
}

@media (max-width: 768px) {
  .dashboard-grid {
    grid-template-columns: 1fr;
  }
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.card:hover {
  box-shadow: var(--shadow-lg);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.card-title {
  font-size: 16px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-primary);
}

.card-title .icon {
  font-size: 20px;
}

/* ============ UPLOAD ZONE ============ */
.upload-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 40px 20px;
  text-align: center;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.upload-zone:hover,
.upload-zone.dragover {
  border-color: var(--accent);
  background: var(--accent-bg);
}

.upload-zone .upload-icon {
  font-size: 40px;
  margin-bottom: 12px;
  display: block;
}

.upload-zone .upload-text {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 4px;
}

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

.upload-zone input[type="file"] {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
}

/* ============ QUESTIONNAIRE TABS ============ */
.q-tabs {
  display: flex;
  gap: 0;
  margin-bottom: 16px;
  border-bottom: 2px solid var(--border);
}

.q-tab {
  flex: 1;
  padding: 10px 16px;
  font-size: 13px;
  font-weight: 600;
  font-family: 'Inter', sans-serif;
  color: var(--text-muted);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  cursor: pointer;
  transition: var(--transition);
  text-align: center;
}

.q-tab:hover {
  color: var(--text-secondary);
}

.q-tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.q-textarea {
  width: 100%;
  min-height: 180px;
  padding: 14px 16px;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-primary);
  font-family: 'Inter', sans-serif;
  font-size: 13px;
  line-height: 1.7;
  resize: vertical;
  outline: none;
  transition: var(--transition);
}

.q-textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.q-textarea::placeholder {
  color: var(--text-muted);
}

/* ============ REFERENCE DOCS LIST ============ */
.doc-list {
  list-style: none;
  max-height: 280px;
  overflow-y: auto;
}

.doc-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-bottom: 8px;
  transition: var(--transition);
}

.doc-item:hover {
  border-color: var(--border-hover);
  background: var(--accent-bg);
}

.doc-item .doc-name {
  font-size: 13px;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-primary);
}

.doc-item .doc-meta {
  font-size: 11px;
  color: var(--text-muted);
}

/* ============ SESSION / VERSION HISTORY ============ */
.sessions-section {
  margin-top: 32px;
}

.sessions-section h3 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-primary);
}

.session-list {
  display: grid;
  gap: 12px;
}

.session-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: var(--transition);
  cursor: pointer;
}

.session-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.session-info {
  flex: 1;
}

.session-info .session-name {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 4px;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-primary);
}

.session-info .session-meta {
  font-size: 12px;
  color: var(--text-secondary);
}

.session-stats {
  display: flex;
  gap: 16px;
  align-items: center;
}

.stat-badge {
  padding: 4px 10px;
  border-radius: 20px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.5px;
}

.stat-badge.total {
  background: var(--accent-bg);
  color: var(--accent);
}

.stat-badge.answered {
  background: var(--success-bg);
  color: var(--success);
}

.stat-badge.not-found {
  background: var(--warning-bg);
  color: var(--warning);
}

.status-badge {
  padding: 4px 10px;
  border-radius: 20px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

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

.status-badge.generated {
  background: var(--accent-bg);
  color: var(--accent);
}

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

/* ============ REVIEW PAGE ============ */
.review-container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 32px;
}

.review-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  flex-wrap: wrap;
  gap: 16px;
}

.review-header h2 {
  font-size: 24px;
  font-weight: 700;
  color: var(--text-primary);
}

.review-actions {
  display: flex;
  gap: 12px;
  align-items: center;
}

.stats-bar {
  display: flex;
  gap: 12px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.stats-bar .stat-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 13px;
  color: var(--text-secondary);
  box-shadow: var(--shadow);
}

.stats-bar .stat-item .stat-value {
  font-weight: 700;
  font-size: 18px;
  color: var(--text-primary);
}

/* ============ QA CARD ============ */
.qa-list {
  display: grid;
  gap: 16px;
}

.qa-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: var(--transition);
  animation: fadeIn 0.5s ease;
  box-shadow: var(--shadow);
}

.qa-card:hover {
  box-shadow: var(--shadow-lg);
}

.qa-question {
  display: flex;
  gap: 12px;
  margin-bottom: 16px;
}

.qa-number {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent);
  border-radius: 8px;
  font-size: 14px;
  font-weight: 700;
  color: white;
}

.qa-question-text {
  font-size: 15px;
  font-weight: 600;
  line-height: 1.5;
  padding-top: 4px;
  color: var(--text-primary);
}

.qa-answer {
  margin-left: 44px;
  padding: 16px;
  background: var(--bg-primary);
  border-radius: 8px;
  border-left: 3px solid var(--accent);
  margin-bottom: 12px;
}

.qa-answer-text {
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-primary);
}

.qa-answer.not-found {
  border-left-color: var(--warning);
  background: var(--warning-bg);
}

.qa-answer.not-found .qa-answer-text {
  color: var(--warning);
  font-style: italic;
}

/* Edit mode */
.qa-edit-area {
  display: none;
  margin-left: 44px;
  margin-bottom: 12px;
}

.qa-edit-area textarea {
  width: 100%;
  min-height: 100px;
  padding: 12px;
  background: #ffffff;
  border: 2px solid var(--accent);
  border-radius: 8px;
  color: var(--text-primary);
  font-family: 'Inter', sans-serif;
  font-size: 14px;
  resize: vertical;
  outline: none;
  line-height: 1.6;
}

.qa-edit-area textarea:focus {
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.qa-edit-actions {
  display: flex;
  gap: 8px;
  margin-top: 8px;
}

/* Confidence badge */
.confidence-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 11px;
  font-weight: 600;
  margin-left: 44px;
  margin-bottom: 8px;
}

.confidence-badge.high {
  background: var(--success-bg);
  color: var(--success);
}

.confidence-badge.medium {
  background: var(--warning-bg);
  color: var(--warning);
}

.confidence-badge.low {
  background: var(--danger-bg);
  color: var(--danger);
}

/* Citations */
.qa-citations {
  margin-left: 44px;
  margin-top: 8px;
}

.qa-citations-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 6px;
}

.citation-item {
  display: flex;
  gap: 8px;
  padding: 8px 12px;
  background: var(--accent-bg);
  border-radius: 6px;
  margin-bottom: 4px;
  font-size: 12px;
  border: 1px solid rgba(37, 99, 235, 0.1);
}

.citation-doc {
  font-weight: 600;
  color: var(--accent);
  white-space: nowrap;
}

.citation-excerpt {
  color: var(--text-muted);
  font-style: italic;
  overflow: hidden;
  text-overflow: ellipsis;
}

.qa-meta {
  margin-left: 44px;
  margin-top: 8px;
  display: flex;
  gap: 8px;
  align-items: center;
}

.edited-badge {
  font-size: 11px;
  color: var(--text-muted);
  font-style: italic;
}

/* ============ LOADING ============ */
.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(4px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  flex-direction: column;
  gap: 16px;
}

.loading-overlay.active {
  display: flex;
}

.spinner {
  width: 48px;
  height: 48px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.loading-text {
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
  animation: pulse 1.5s ease infinite;
}

/* ============ EMPTY STATE ============ */
.empty-state {
  text-align: center;
  padding: 40px 20px;
  color: var(--text-muted);
}

.empty-state .empty-icon {
  font-size: 48px;
  margin-bottom: 12px;
  display: block;
}

.empty-state p {
  font-size: 14px;
}

/* ============ TOAST ============ */
.toast-container {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toast {
  padding: 12px 20px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 500;
  animation: slideIn 0.3s ease;
  box-shadow: var(--shadow-lg);
  min-width: 280px;
}

.toast.success {
  background: var(--success);
  color: white;
}

.toast.error {
  background: var(--danger);
  color: white;
}

.toast.info {
  background: var(--accent);
  color: white;
}

/* ============ GENERATE BUTTON ============ */
.generate-section {
  margin-top: 24px;
  text-align: center;
}

.btn-generate {
  padding: 16px 48px;
  font-size: 16px;
  font-weight: 700;
  background: var(--accent);
  color: white;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: var(--transition);
  font-family: 'Inter', sans-serif;
}

.btn-generate:hover {
  background: #1d4ed8;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px var(--accent-glow);
}

.btn-generate:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

/* ============ BACK LINK ============ */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  margin-bottom: 16px;
  transition: var(--transition);
}

.back-link:hover {
  color: var(--accent);
}