/* Research Tailor - Modern Design System */

/* ============================================
   CSS Variables - Design Tokens
   ============================================ */
:root {
  /* Colors */
  --color-primary: #3b82f6;
  --color-primary-light: #60a5fa;
  --color-primary-dark: #2563eb;
  --color-primary-gradient: linear-gradient(135deg, #3b82f6 0%, #60a5fa 100%);
  
  --color-text-primary: #1f2937;
  --color-text-secondary: #4b5563;
  --color-text-muted: #6b7280;
  --color-text-light: #9ca3af;
  
  --color-bg-primary: #ffffff;
  --color-bg-secondary: #f9fafb;
  --color-bg-light: #f3f4f6;
  
  --color-border: #e5e7eb;
  --color-border-light: #f3f4f6;
  
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-danger: #ef4444;
  --color-info: #3b82f6;
  
  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --font-size-xs: 12px;
  --font-size-sm: 13px;
  --font-size-base: 14px;
  --font-size-md: 15px;
  --font-size-lg: 18px;
  --font-size-xl: 20px;
  --font-size-2xl: 24px;
  --font-size-3xl: 36px;
  --font-size-4xl: 56px;
  --font-size-5xl: 64px;
  
  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 40px;
  --spacing-3xl: 60px;
  
  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 10px;
  --radius-xl: 12px;
  --radius-2xl: 16px;
  
  /* Shadows */
  --shadow-xs: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-sm: 0 2px 4px rgba(0,0,0,0.05);
  --shadow-md: 0 2px 6px rgba(0,0,0,0.05);
  --shadow-lg: 0 2px 8px rgba(0,0,0,0.05);
  --shadow-xl: 0 4px 12px rgba(0,0,0,0.07);
  --shadow-2xl: 0 8px 24px rgba(0,0,0,0.1);
  --shadow-primary: 0 2px 6px rgba(59,130,246,0.2);
  
  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 200ms ease-in-out;
  --transition-slow: 300ms ease-in-out;
}

/* ============================================
   Base Styles
   ============================================ */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: var(--font-family);
  background: var(--color-bg-primary);
  color: var(--color-text-primary);
  min-height: 100vh;
  line-height: 1.6;
  font-size: var(--font-size-base);
  display: flex;
  flex-direction: column;
}

/* ============================================
   Typography
   ============================================ */
h1 {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  color: #111827;
  letter-spacing: -2px;
  line-height: 1.1;
  margin-bottom: var(--spacing-md);
}

h2 {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  color: #111827;
  letter-spacing: -1px;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
}

h3 {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--color-text-primary);
  line-height: 1.3;
  margin-bottom: var(--spacing-md);
}

h4 {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-sm);
}

h5 {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-sm);
}

h6 {
  font-size: var(--font-size-md);
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-sm);
}

p {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-md);
}

.text-muted {
  color: var(--color-text-muted) !important;
}

.text-primary {
  color: var(--color-primary) !important;
}

/* ============================================
   Header
   ============================================ */
.header {
  background: var(--color-bg-primary);
  border-bottom: 1px solid var(--color-border);
  padding: 20px 40px;
  box-shadow: var(--shadow-md);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.header-content {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 20px;
  font-weight: 600;
  color: var(--color-text-primary);
  letter-spacing: -0.5px;
  text-decoration: none;
}

.logo-icon {
  width: 36px;
  height: 36px;
  background: var(--color-primary-gradient);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-bg-primary);
  font-weight: 700;
  font-size: 18px;
}

.nav {
  display: flex;
  gap: 40px;
  align-items: center;
}

.nav-item {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-weight: 500;
  font-size: var(--font-size-md);
  transition: color var(--transition-base);
}

.nav-item:hover {
  color: var(--color-primary-dark);
}

.nav-item.active {
  color: var(--color-primary);
}

.user-menu {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.user-email {
  color: var(--color-text-muted);
  font-size: var(--font-size-base);
}

.user-dropdown {
  position: relative;
}

.user-dropdown-toggle {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  border: none;
  background: transparent;
  color: var(--color-text-secondary);
  cursor: pointer;
  border-radius: var(--radius-md);
  transition: background-color var(--transition-base);
}

.user-dropdown-toggle:hover {
  background: var(--color-bg-secondary);
}

.dropdown-menu {
  display: none;
  position: absolute;
  right: 0;
  top: 100%;
  margin-top: var(--spacing-sm);
  background: var(--color-bg-primary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  min-width: 200px;
  z-index: 1000;
}

.dropdown-menu.show {
  display: block;
}

.dropdown-item {
  display: block;
  padding: var(--spacing-sm) var(--spacing-md);
  color: var(--color-text-primary);
  text-decoration: none;
  transition: background-color var(--transition-base);
}

.dropdown-item:hover {
  background: var(--color-bg-secondary);
}

.dropdown-divider {
  height: 1px;
  background: var(--color-border);
  margin: var(--spacing-xs) 0;
}

/* ============================================
   Container
   ============================================ */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--spacing-2xl) 40px;  /* Reduced from 60px to 40px */
  flex: 1;
}

.container-fluid {
  padding: var(--spacing-2xl) 40px;  /* Reduced from 60px to 40px */
  flex: 1;
}

/* ============================================
   Dashboard Styles
   ============================================ */
.dashboard-header {
  margin-bottom: 50px;
}

.dashboard-header h1 {
  margin-bottom: 12px;
}

.dashboard-header p {
  font-size: var(--font-size-lg);
  font-weight: 400;
  color: var(--color-text-muted);
  margin-bottom: 20px;
}

/* ============================================
   Buttons
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: 14px 24px;
  border: none;
  border-radius: var(--radius-lg);
  font-size: var(--font-size-md);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  text-align: center;
  justify-content: center;
}

.btn-primary {
  background: var(--color-primary-gradient);
  color: var(--color-bg-primary);
  box-shadow: var(--shadow-primary);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 10px rgba(59,130,246,0.25);
}

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

.btn-secondary:hover {
  background: var(--color-bg-light);
  transform: translateY(-1px);
}

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

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

.btn-danger {
  background: var(--color-danger);
  color: var(--color-bg-primary);
  box-shadow: 0 2px 6px rgba(239,68,68,0.2);
}

.btn-danger:hover {
  background: #dc2626;
  transform: translateY(-1px);
  box-shadow: 0 4px 10px rgba(239,68,68,0.25);
}

.btn-sm {
  padding: 8px 16px;
  font-size: var(--font-size-sm);
}

.btn-lg {
  padding: 16px 32px;
  font-size: var(--font-size-lg);
}

.btn-icon {
  width: 32px;
  height: 32px;
  padding: 0;
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
}

.action-btn {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-bg-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-base);
  color: var(--color-text-muted);
  transition: all var(--transition-base);
}

.action-btn:hover {
  background: #e0f2fe;
  color: var(--color-primary-dark);
  border-color: #bfdbfe;
}

/* ============================================
   Cards
   ============================================ */
.card {
  background: var(--color-bg-secondary);
  border-radius: var(--radius-2xl);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-lg);
  transition: all var(--transition-base);
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-lg);
}

.card-title {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: #111827;
  margin: 0;
}

.card-subtitle {
  color: var(--color-text-muted);
  font-size: var(--font-size-base);
  margin-top: var(--spacing-xs);
}

.card-body {
  padding: 0;
}

/* ============================================
   Stats Cards
   ============================================ */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-3xl);
}

.stat-card {
  background: var(--color-bg-secondary);
  border-radius: var(--radius-2xl);
  padding: var(--spacing-2xl) var(--spacing-xl);
  box-shadow: var(--shadow-lg);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.stat-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
}

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

.stat-value {
  font-size: var(--font-size-5xl);
  font-weight: 700;
  color: #111827;
  line-height: 1;
  letter-spacing: -2px;
}

/* ============================================
   Content Grid
   ============================================ */
.content-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: var(--spacing-lg);
}

/* ============================================
   Tables
   ============================================ */
.table-container {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
}

thead th {
  text-align: left;
  color: var(--color-text-muted);
  font-weight: 600;
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 12px 0;
  border-bottom: 1px solid var(--color-border);
}

tbody tr {
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition-base);
}

tbody tr:hover {
  background: #f1f5f9;
}

tbody td {
  padding: var(--spacing-md) 0;
  color: var(--color-text-primary);
  vertical-align: middle;
}

.report-name {
  font-weight: 600;
  color: var(--color-text-primary);
  font-size: var(--font-size-md);
}

.report-desc {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  margin-top: var(--spacing-xs);
}

.last-run {
  color: var(--color-text-muted);
  font-size: var(--font-size-base);
}

.actions {
  display: flex;
  gap: var(--spacing-sm);
  justify-content: flex-end;
}

/* ============================================
   Activity List
   ============================================ */
.activity-item {
  padding: var(--spacing-lg);
  background: var(--color-bg-primary);
  border-radius: var(--radius-xl);
  margin-bottom: var(--spacing-md);
  border: 1px solid var(--color-border);
  transition: all var(--transition-base);
  box-shadow: var(--shadow-sm);
}

.activity-item:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.activity-title {
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-sm);
  font-size: var(--font-size-md);
}

.activity-time {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  margin-bottom: var(--spacing-sm);
}

.activity-detail {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  margin-bottom: var(--spacing-sm);
}

.activity-meta {
  display: flex;
  gap: var(--spacing-sm);
  align-items: center;
  flex-wrap: wrap;
}

/* ============================================
   Badges
   ============================================ */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  font-size: var(--font-size-xs);
  font-weight: 500;
  border: 1px solid var(--color-border);
  background: var(--color-bg-secondary);
}

.badge.score {
  color: var(--color-primary-dark);
  border-color: #bfdbfe;
  background: #eff6ff;
}

.badge.papers {
  color: var(--color-text-muted);
}

.badge.success {
  color: var(--color-success);
  background: #ecfdf5;
  border-color: #86efac;
}

.badge.warning {
  color: var(--color-warning);
  background: #fef3c7;
  border-color: #fde68a;
}

.badge.danger {
  color: var(--color-danger);
  background: #fee2e2;
  border-color: #fecaca;
}

/* ============================================
   Forms
   ============================================ */
.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-label {
  display: block;
  color: var(--color-text-primary);
  font-weight: 600;
  font-size: var(--font-size-base);
  margin-bottom: var(--spacing-sm);
}

.form-control {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  color: var(--color-text-primary);
  background: var(--color-bg-primary);
  transition: all var(--transition-base);
  font-family: var(--font-family);
}

.form-control:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-control:disabled {
  background: var(--color-bg-secondary);
  color: var(--color-text-muted);
  cursor: not-allowed;
}

textarea.form-control {
  resize: vertical;
  min-height: 100px;
  line-height: 1.5;
}

.form-text {
  display: block;
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  margin-top: var(--spacing-xs);
}

.form-check {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.form-check-input {
  width: 20px;
  height: 20px;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  accent-color: var(--color-primary);
}

.form-check-label {
  color: var(--color-text-primary);
  cursor: pointer;
}

.invalid-feedback {
  color: var(--color-danger);
  font-size: var(--font-size-sm);
  margin-top: var(--spacing-xs);
}

.is-invalid {
  border-color: var(--color-danger) !important;
}

/* ============================================
   Alerts
   ============================================ */
.alert {
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-lg);
  font-size: var(--font-size-base);
  position: relative;
}

.alert-success {
  background: #ecfdf5;
  color: #065f46;
  border: 1px solid #86efac;
}

.alert-info {
  background: #eff6ff;
  color: #1e40af;
  border: 1px solid #bfdbfe;
}

.alert-warning {
  background: #fef3c7;
  color: #92400e;
  border: 1px solid #fde68a;
}

.alert-danger {
  background: #fee2e2;
  color: #991b1b;
  border: 1px solid #fecaca;
}

.alert-dismissible {
  padding-right: 48px;
}

.btn-close {
  position: absolute;
  right: var(--spacing-md);
  top: 50%;
  transform: translateY(-50%);
  background: transparent;
  border: none;
  cursor: pointer;
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: inherit;
  opacity: 0.5;
}

.btn-close:hover {
  opacity: 1;
}

/* ============================================
   Footer
   ============================================ */
.footer-section {
  background: #2d3436;
  color: #dfe6e9;
  padding: 0.75rem 0 0.5rem;  /* Much slimmer: 12px top, 8px bottom */
  margin-top: auto;
  font-size: var(--font-size-sm);  /* Smaller font size */
}

.footer-brand {
  font-size: var(--font-size-md);  /* Reduced from lg */
  font-weight: 600;
  color: #ffffff;
  margin-bottom: 4px;  /* Minimal spacing */
}

.footer-tagline {
  color: #b2bec3;
  font-size: var(--font-size-sm);  /* Smaller text */
  margin-bottom: var(--spacing-sm);  /* Much less space */
}

.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  gap: var(--spacing-lg);  /* Reduced from xl */
}

.footer-links a {
  color: #dfe6e9;
  text-decoration: none;
  transition: color var(--transition-base);
  font-size: var(--font-size-sm);  /* Smaller links */
}

.footer-links a:hover {
  color: #ffffff;
}

.footer-bottom {
  border-top: 1px solid #636e72;
  margin-top: var(--spacing-sm);  /* Minimal space */
  padding-top: var(--spacing-xs);  /* Very minimal padding */
  color: #b2bec3;
  font-size: var(--font-size-xs);  /* Smallest font */
}

/* ============================================
   Utilities
   ============================================ */
.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }
.mt-5 { margin-top: var(--spacing-xl); }

.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }
.mb-5 { margin-bottom: var(--spacing-xl); }

.p-1 { padding: var(--spacing-xs); }
.p-2 { padding: var(--spacing-sm); }
.p-3 { padding: var(--spacing-md); }
.p-4 { padding: var(--spacing-lg); }
.p-5 { padding: var(--spacing-xl); }

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.d-none { display: none; }
.d-block { display: block; }
.d-flex { display: flex; }
.d-grid { display: grid; }

.align-items-center { align-items: center; }
.align-items-start { align-items: start; }
.justify-content-center { justify-content: center; }
.justify-content-between { justify-content: space-between; }

.gap-1 { gap: var(--spacing-xs); }
.gap-2 { gap: var(--spacing-sm); }
.gap-3 { gap: var(--spacing-md); }
.gap-4 { gap: var(--spacing-lg); }
.gap-5 { gap: var(--spacing-xl); }

.w-100 { width: 100%; }
.h-100 { height: 100%; }

.overflow-hidden { overflow: hidden; }
.overflow-auto { overflow: auto; }

/* ============================================
   Modals
   ============================================ */
.modal-backdrop {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  z-index: 9998;
  opacity: 0;
  transition: opacity var(--transition-base);
}

.modal-backdrop.show {
  display: block;
  opacity: 1;
}

.modal {
  display: none;
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.95);
  z-index: 9999;
  opacity: 0;
  transition: all var(--transition-base);
}

.modal.show {
  display: block;
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
}

.modal-content {
  background: var(--color-bg-primary);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-2xl);
  max-width: 520px;
  width: 90vw;
  max-height: 90vh;
  overflow: auto;
}

.modal-header {
  padding: var(--spacing-xl);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-radius: var(--radius-2xl) var(--radius-2xl) 0 0;
}

.modal-close {
  background: transparent;
  border: none;
  font-size: 24px;
  cursor: pointer;
  color: white;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  transition: opacity var(--transition-base);
}

.modal-close:hover {
  opacity: 0.8;
}

.modal-body {
  padding: var(--spacing-xl);
}

.modal-footer {
  padding: var(--spacing-xl);
  border-top: 1px solid var(--color-border);
  display: flex;
  justify-content: flex-end;
  gap: var(--spacing-md);
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 968px) {
  .content-grid {
    grid-template-columns: 1fr;
  }
  
  .stats-grid {
    grid-template-columns: 1fr;
  }
  
  .header {
    padding: var(--spacing-md) var(--spacing-lg);
  }
  
  .container,
  .container-fluid {
    padding: var(--spacing-xl) var(--spacing-lg);
  }
}

@media (max-width: 640px) {
  .container,
  .container-fluid {
    padding: var(--spacing-2xl) var(--spacing-md);
  }

  .header {
    padding: var(--spacing-md);
  }
  
  .nav {
    display: none;
  }

  h1 {
    font-size: var(--font-size-3xl);
  }
  
  .stat-value {
    font-size: var(--font-size-4xl);
  }
  
  .mobile-menu {
    display: block;
  }
}

/* ============================================
   Loading & Spinner
   ============================================ */
.spinner {
  border: 3px solid var(--color-border);
  border-top: 3px solid var(--color-primary);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  animation: spin 1s linear infinite;
  margin: var(--spacing-xl) auto;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* ============================================
   Transitions & Animations
   ============================================ */
.fade-in {
  animation: fadeIn 0.3s ease-in;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.slide-in {
  animation: slideIn 0.3s ease-out;
}

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