/* Modern Glassmorphism & High-Aesthetic Theme for Citation Checker & BibFixer */

:root {
  --bg-main: #090d16;
  --bg-card: rgba(18, 24, 38, 0.7);
  --bg-card-hover: rgba(26, 35, 54, 0.85);
  --bg-glass: rgba(255, 255, 255, 0.03);
  --border-glass: rgba(255, 255, 255, 0.08);
  --border-glass-focus: rgba(99, 102, 241, 0.5);

  --text-main: #f3f4f6;
  --text-muted: #9ca3af;
  --text-dim: #6b7280;

  --accent-primary: #6366f1;
  --accent-primary-hover: #4f46e5;
  --accent-cyan: #06b6d4;

  --status-verified: #10b981;
  --status-verified-bg: rgba(16, 185, 129, 0.12);
  --status-verified-border: rgba(16, 185, 129, 0.3);

  --status-discrepancy: #f59e0b;
  --status-discrepancy-bg: rgba(245, 158, 11, 0.12);
  --status-discrepancy-border: rgba(245, 158, 11, 0.3);

  --status-hallucinated: #ef4444;
  --status-hallucinated-bg: rgba(239, 68, 68, 0.12);
  --status-hallucinated-border: rgba(239, 68, 68, 0.3);

  --status-uncheckable: #38bdf8;
  --status-uncheckable-bg: rgba(56, 189, 248, 0.12);
  --status-uncheckable-border: rgba(56, 189, 248, 0.3);

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --shadow-glow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
}

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

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background-color: var(--bg-main);
  background-image: 
    radial-gradient(circle at 15% 15%, rgba(99, 102, 241, 0.15) 0%, transparent 40%),
    radial-gradient(circle at 85% 85%, rgba(6, 182, 212, 0.12) 0%, transparent 40%);
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  line-height: 1.5;
}

/* Navbar */
.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 2.5rem;
  background: rgba(9, 13, 22, 0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-glass);
  position: sticky;
  top: 0;
  z-index: 100;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-main);
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}

.brand-icon {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-cyan));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 15px rgba(99, 102, 241, 0.4);
}

.nav-links {
  display: flex;
  gap: 1rem;
}

.nav-item {
  color: var(--text-muted);
  text-decoration: none;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  font-weight: 500;
  font-size: 0.95rem;
  transition: all 0.2s ease;
}

.nav-item:hover, .nav-item.active {
  color: #fff;
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
}

/* Layout Containers */
.container {
  max-width: 1280px;
  width: 100%;
  margin: 0 auto;
  padding: 2.5rem 1.5rem;
  flex: 1;
}

/* Hero & Header */
.hero {
  text-align: center;
  margin-bottom: 3rem;
}

.hero-title {
  font-size: 2.75rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, #ffffff 30%, #9ca3af 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 0.75rem;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-muted);
  max-width: 680px;
  margin: 0 auto;
}

/* Glass Card */
.glass-card {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-glow);
  transition: border-color 0.2s ease, transform 0.2s ease;
}

/* Upload Section */
.upload-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin-bottom: 3rem;
}

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

.drop-zone {
  border: 2px dashed rgba(99, 102, 241, 0.4);
  border-radius: var(--radius-md);
  padding: 3rem 1.5rem;
  text-align: center;
  cursor: pointer;
  background: rgba(99, 102, 241, 0.03);
  transition: all 0.25s ease;
}

.drop-zone:hover, .drop-zone.dragover {
  border-color: var(--accent-primary);
  background: rgba(99, 102, 241, 0.08);
  transform: translateY(-2px);
}

.drop-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  color: var(--accent-primary);
}

.text-area-input {
  width: 100%;
  height: 180px;
  background: rgba(11, 15, 25, 0.8);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 1rem;
  color: var(--text-main);
  font-family: 'Fira Code', 'Courier New', monospace;
  font-size: 0.9rem;
  resize: vertical;
}

.text-area-input:focus {
  outline: none;
  border-color: var(--border-glass-focus);
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-cyan));
  color: #fff;
  border: none;
  border-radius: var(--radius-md);
  padding: 0.85rem 1.75rem;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.2s ease;
  box-shadow: 0 4px 15px rgba(99, 102, 241, 0.35);
  width: 100%;
  margin-top: 1rem;
}

.btn-primary:hover {
  opacity: 0.92;
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(99, 102, 241, 0.45);
}

/* Metric Cards */
.metrics-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
  margin-bottom: 2.5rem;
}

@media (max-width: 900px) {
  .metrics-row {
    grid-template-columns: repeat(2, 1fr);
  }
}

.metric-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  position: relative;
  overflow: hidden;
}

.metric-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
}

.metric-total::before { background: var(--accent-primary); }
.metric-verified::before { background: var(--status-verified); }
.metric-discrepancy::before { background: var(--status-discrepancy); }
.metric-hallucinated::before { background: var(--status-hallucinated); }

.metric-label {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.metric-value {
  font-size: 2.25rem;
  font-weight: 800;
  line-height: 1;
}

.metric-sub {
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-top: 0.4rem;
}

/* Status Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.3rem 0.75rem;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.badge-verified {
  background: var(--status-verified-bg);
  color: var(--status-verified);
  border: 1px solid var(--status-verified-border);
}

.badge-discrepancy {
  background: var(--status-discrepancy-bg);
  color: var(--status-discrepancy);
  border: 1px solid var(--status-discrepancy-border);
}

.badge-hallucinated {
  background: var(--status-hallucinated-bg);
  color: var(--status-hallucinated);
  border: 1px solid var(--status-hallucinated-border);
}

.badge-uncheckable {
  background: var(--status-uncheckable-bg);
  color: var(--status-uncheckable);
  border: 1px solid var(--status-uncheckable-border);
}

/* Reference Table & Cards */
.filters-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.tabs {
  display: flex;
  gap: 0.5rem;
  background: rgba(11, 15, 25, 0.8);
  padding: 0.3rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-glass);
}

.tab-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  padding: 0.5rem 1.25rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

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

.search-input {
  background: rgba(11, 15, 25, 0.8);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 0.6rem 1.2rem;
  color: var(--text-main);
  width: 280px;
  font-size: 0.9rem;
}

.search-input:focus {
  outline: none;
  border-color: var(--border-glass-focus);
}

/* Reference Item Card */
.ref-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.ref-item-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  transition: all 0.2s ease;
}

.ref-item-card:hover {
  border-color: rgba(255, 255, 255, 0.2);
  background: var(--bg-card-hover);
}

.ref-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}

.ref-key {
  font-family: monospace;
  background: rgba(255, 255, 255, 0.06);
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  font-size: 0.85rem;
  color: var(--accent-cyan);
}

.ref-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
  color: #fff;
}

.ref-meta {
  font-size: 0.9rem;
  color: var(--text-muted);
  display: flex;
  gap: 1.25rem;
  flex-wrap: wrap;
  margin-bottom: 0.75rem;
}

.discrepancy-box {
  background: var(--status-discrepancy-bg);
  border: 1px solid var(--status-discrepancy-border);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  margin-top: 0.75rem;
}

.discrepancy-title {
  font-weight: 700;
  color: var(--status-discrepancy);
  font-size: 0.85rem;
  margin-bottom: 0.4rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.disc-item {
  font-size: 0.85rem;
  margin-bottom: 0.3rem;

}

.disc-item:last-child {
  margin-bottom: 0;
}

.disc-expected {
  color: var(--status-verified);
  font-weight: 600;
}

.disc-found {
  color: var(--status-hallucinated);
  text-decoration: line-through;
}

/* BibFixer Dual Editor */
.editor-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

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

.editor-box {
  display: flex;
  flex-direction: column;
}

.editor-label {
  font-weight: 600;
  font-size: 0.95rem;
  margin-bottom: 0.5rem;
  color: var(--text-muted);
  display: flex;
  justify-content: space-between;
}

.options-panel {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  background: rgba(11, 15, 25, 0.8);
  padding: 1.25rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-glass);
  margin-bottom: 1.5rem;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.9rem;
  cursor: pointer;
  user-select: none;
}

.checkbox-label input[type="checkbox"] {
  accent-color: var(--accent-primary);
  width: 18px;
  height: 18px;
}

/* Spinner Overlay */
.spinner-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(9, 13, 22, 0.85);
  backdrop-filter: blur(12px);
  z-index: 1000;
  align-items: center;
  justify-content: center;
  flex-direction: column;
}

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

.spinner {
  width: 60px;
  height: 60px;
  border: 4px solid var(--border-glass);
  border-top-color: var(--accent-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

.spinnerText {
  margin-top: 1.5rem;
  font-size: 1.2rem;
  font-weight: 600;
  color: #fff;
}

/* Buy Me A Coffee Support Button & Site Footer */
.btn-support {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: linear-gradient(135deg, #ffdd00 0%, #ff9900 100%);
  color: #000;
  font-weight: 700;
  padding: 0.5rem 1.15rem;
  font-size: 0.85rem;
  border-radius: 9999px;
  text-decoration: none;
  transition: all 0.25s ease;
  box-shadow: 0 4px 15px rgba(255, 221, 0, 0.3);
}

.btn-support:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 6px 20px rgba(255, 221, 0, 0.45);
  color: #000;
}

.site-footer {
  margin-top: auto;
  padding: 1.5rem 2.5rem;
  background: rgba(9, 13, 22, 0.85);
  backdrop-filter: blur(16px);
  border-top: 1px solid var(--border-glass);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.footer-text {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer-link {
  color: var(--accent-cyan);
  text-decoration: underline;
}