/* ==========================================================================
   VectorVault-AI — Design System
   Glassmorphism + Neural Aesthetic
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500;600&display=swap');

/* ---------- Tokens ---------- */
:root {
  --bg-deep:      #06060f;
  --bg-surface:   rgba(16, 16, 32, 0.65);
  --glass:        rgba(255, 255, 255, 0.04);
  --glass-border: rgba(255, 255, 255, 0.08);
  --glass-hover:  rgba(255, 255, 255, 0.07);
  --accent:       #7c5cfc;
  --accent-glow:  rgba(124, 92, 252, 0.35);
  --accent-light: #a78bfa;
  --cyan:         #22d3ee;
  --cyan-glow:    rgba(34, 211, 238, 0.25);
  --emerald:      #34d399;
  --rose:         #fb7185;
  --text-primary: #f0f0f8;
  --text-muted:   rgba(240, 240, 248, 0.55);
  --text-dim:     rgba(240, 240, 248, 0.3);
  --radius:       16px;
  --radius-sm:    10px;
  --radius-xs:    6px;
  --shadow-card:  0 8px 32px rgba(0, 0, 0, 0.45);
  --transition:   0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font-body:    'Inter', system-ui, -apple-system, sans-serif;
  --font-mono:    'JetBrains Mono', 'Fira Code', monospace;
}

/* ---------- Reset ---------- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-body);
  background: var(--bg-deep);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
  transition: background 0.4s ease, color 0.4s ease;
}

/* ---------- Light Theme ---------- */
body.light-theme {
  --bg-deep:      #f0f2f5;
  --bg-surface:   rgba(255, 255, 255, 0.75);
  --glass:        rgba(0, 0, 0, 0.03);
  --glass-border: rgba(0, 0, 0, 0.08);
  --glass-hover:  rgba(0, 0, 0, 0.05);
  --accent:       #6c47f0;
  --accent-glow:  rgba(108, 71, 240, 0.2);
  --accent-light: #7c5cfc;
  --cyan:         #0891b2;
  --cyan-glow:    rgba(8, 145, 178, 0.15);
  --emerald:      #059669;
  --rose:         #e11d48;
  --text-primary: #1a1a2e;
  --text-muted:   rgba(26, 26, 46, 0.6);
  --text-dim:     rgba(26, 26, 46, 0.35);
  --shadow-card:  0 4px 24px rgba(0, 0, 0, 0.08);
}

body.light-theme::before {
  background:
    radial-gradient(ellipse 60% 50% at 20% 30%, rgba(108, 71, 240, 0.06) 0%, transparent 70%),
    radial-gradient(ellipse 50% 60% at 80% 70%, rgba(8, 145, 178, 0.05) 0%, transparent 70%),
    radial-gradient(ellipse 40% 40% at 50% 50%, rgba(5, 150, 105, 0.04) 0%, transparent 70%);
}

body.light-theme .header__title {
  background: linear-gradient(135deg, #1a1a2e 30%, var(--accent) 70%, var(--cyan) 100%);
  -webkit-background-clip: text;
  background-clip: text;
}

body.light-theme .card:hover {
  border-color: rgba(0, 0, 0, 0.12);
}

body.light-theme .upload-zone {
  border-color: rgba(108, 71, 240, 0.3);
}

body.light-theme .upload-zone:hover,
body.light-theme .upload-zone.dragover {
  border-color: var(--accent);
  background: rgba(108, 71, 240, 0.04);
}

body.light-theme .search-input {
  background: rgba(0, 0, 0, 0.03);
}

body.light-theme .result-card:hover {
  border-color: rgba(0, 0, 0, 0.12);
}

body.light-theme .map-container {
  background: rgba(255, 255, 255, 0.5);
}

body.light-theme .map-tooltip {
  background: rgba(255, 255, 255, 0.95);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
}

body.light-theme .toast {
  background: rgba(255, 255, 255, 0.9);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
}

body.light-theme .progress-bar {
  background: rgba(0, 0, 0, 0.06);
}

body.light-theme .file-item {
  background: rgba(0, 0, 0, 0.02);
}

/* ---------- Animated Background ---------- */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 50% at 20% 30%, rgba(124, 92, 252, 0.08) 0%, transparent 70%),
    radial-gradient(ellipse 50% 60% at 80% 70%, rgba(34, 211, 238, 0.06) 0%, transparent 70%),
    radial-gradient(ellipse 40% 40% at 50% 50%, rgba(52, 211, 153, 0.04) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
  animation: bgPulse 12s ease-in-out infinite alternate;
}

@keyframes bgPulse {
  0%   { opacity: 0.8; transform: scale(1); }
  100% { opacity: 1;   transform: scale(1.05); }
}

/* ---------- Layout ---------- */
.app-wrapper {
  position: relative;
  z-index: 1;
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

/* ---------- Theme Toggle ---------- */
.theme-toggle {
  position: absolute;
  top: 2rem;
  right: 1.5rem;
  z-index: 10;
  width: 42px; height: 42px;
  border-radius: 50%;
  border: 1px solid var(--glass-border);
  background: var(--glass);
  backdrop-filter: blur(12px);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.theme-toggle:hover {
  background: var(--glass-hover);
  border-color: var(--accent);
  box-shadow: 0 0 16px var(--accent-glow);
  transform: scale(1.08);
}

.theme-toggle__icon {
  font-size: 1.2rem;
  transition: transform 0.4s ease;
  display: block;
}

.theme-toggle:hover .theme-toggle__icon {
  transform: rotate(30deg);
}

/* ---------- Header ---------- */
.header {
  text-align: center;
  margin-bottom: 3rem;
  position: relative;
}

.header__logo {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 0.75rem;
}

.header__icon {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--accent), var(--cyan));
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  box-shadow: 0 0 24px var(--accent-glow);
  animation: iconFloat 4s ease-in-out infinite;
}

@keyframes iconFloat {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-4px); }
}

.header__title {
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, var(--text-primary) 30%, var(--accent-light) 70%, var(--cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.header__sub {
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 400;
  letter-spacing: 0.02em;
}

/* ---------- Stats Bar ---------- */
.stats-bar {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-bottom: 2.5rem;
  flex-wrap: wrap;
}

.stat-pill {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: 999px;
  padding: 8px 20px;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-muted);
  backdrop-filter: blur(12px);
  transition: var(--transition);
}

.stat-pill:hover {
  background: var(--glass-hover);
  color: var(--text-primary);
}

.stat-pill__value {
  color: var(--cyan);
  font-family: var(--font-mono);
  font-weight: 600;
}

.stat-pill__dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--emerald);
  box-shadow: 0 0 6px var(--emerald);
  animation: dotPulse 2s ease-in-out infinite;
}

@keyframes dotPulse {
  0%, 100% { opacity: 1; }
  50%      { opacity: 0.4; }
}

/* ---------- Glass Card ---------- */
.card {
  background: var(--bg-surface);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 2rem;
  backdrop-filter: blur(20px);
  box-shadow: var(--shadow-card);
  transition: var(--transition);
}

.card:hover { border-color: rgba(255, 255, 255, 0.12); }

.card__header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 1.5rem;
}

.card__icon {
  width: 36px; height: 36px;
  border-radius: var(--radius-xs);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
}

.card__icon--upload  { background: rgba(124, 92, 252, 0.15); }
.card__icon--search  { background: rgba(34, 211, 238, 0.15); }
.card__icon--results { background: rgba(52, 211, 153, 0.15); }

.card__title {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.card__label {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-dim);
  font-weight: 600;
}

/* ---------- Two-column Grid ---------- */
.grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

/* ---------- Upload Zone ---------- */
.upload-zone {
  border: 2px dashed rgba(124, 92, 252, 0.25);
  border-radius: var(--radius-sm);
  padding: 2.5rem 1.5rem;
  text-align: center;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.upload-zone::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 50% 50%, var(--accent-glow), transparent 70%);
  opacity: 0;
  transition: var(--transition);
}

.upload-zone:hover,
.upload-zone.dragover {
  border-color: var(--accent);
  background: rgba(124, 92, 252, 0.05);
}

.upload-zone:hover::before,
.upload-zone.dragover::before { opacity: 0.3; }

.upload-zone__icon {
  font-size: 2.5rem;
  margin-bottom: 0.75rem;
  position: relative;
  z-index: 1;
}

.upload-zone__text {
  font-size: 0.9rem;
  color: var(--text-muted);
  position: relative;
  z-index: 1;
}

.upload-zone__text strong {
  color: var(--accent-light);
  font-weight: 600;
}

.upload-zone__hint {
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-top: 0.5rem;
  position: relative;
  z-index: 1;
}

#file-input { display: none; }

/* ---------- Upload Progress ---------- */
.upload-progress {
  display: none;
  margin-top: 1.25rem;
}

.upload-progress.active { display: block; }

.progress-bar {
  height: 4px;
  background: rgba(255, 255, 255, 0.06);
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: 0.5rem;
}

.progress-bar__fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--cyan));
  border-radius: 4px;
  transition: width 0.4s ease;
}

.upload-status {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* ---------- Search ---------- */
.search-wrapper {
  position: relative;
}

.search-input {
  width: 100%;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  padding: 14px 56px 14px 48px;
  font-size: 0.95rem;
  color: var(--text-primary);
  font-family: var(--font-body);
  outline: none;
  transition: var(--transition);
}

.search-input::placeholder { color: var(--text-dim); }
.search-input:focus {
  border-color: var(--cyan);
  box-shadow: 0 0 0 3px var(--cyan-glow);
}

.search-icon {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.1rem;
  color: var(--text-dim);
  pointer-events: none;
}

.search-btn {
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  background: linear-gradient(135deg, var(--accent), #6246ea);
  color: #fff;
  border: none;
  border-radius: var(--radius-xs);
  width: 38px; height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1rem;
  transition: var(--transition);
}

.search-btn:hover {
  transform: translateY(-50%) scale(1.05);
  box-shadow: 0 0 16px var(--accent-glow);
}

.search-btn:active { transform: translateY(-50%) scale(0.97); }

/* ---------- Results Feed ---------- */
.results-feed {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.result-card {
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  padding: 1.25rem;
  transition: var(--transition);
  animation: fadeSlideIn 0.4s ease both;
  position: relative;
  overflow: hidden;
}

.result-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 3px; height: 100%;
  background: linear-gradient(180deg, var(--accent), var(--cyan));
  border-radius: 3px;
}

.result-card:hover {
  background: var(--glass-hover);
  border-color: rgba(255, 255, 255, 0.12);
  transform: translateX(4px);
}

@keyframes fadeSlideIn {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

.result-card__meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.6rem;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.result-card__source {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--accent-light);
  background: rgba(124, 92, 252, 0.1);
  padding: 3px 10px;
  border-radius: 999px;
}

.result-card__score {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  font-weight: 600;
}

.result-card__score--high { color: var(--emerald); }
.result-card__score--mid  { color: #fbbf24; }
.result-card__score--low  { color: var(--rose); }

.result-card__text {
  font-size: 0.85rem;
  line-height: 1.6;
  color: var(--text-muted);
}

.result-card__chunk {
  font-size: 0.7rem;
  color: var(--text-dim);
  margin-top: 0.5rem;
  font-family: var(--font-mono);
}

/* ---------- Empty / Loading States ---------- */
.empty-state {
  text-align: center;
  padding: 3rem 1rem;
}

.empty-state__icon {
  font-size: 2.5rem;
  margin-bottom: 0.75rem;
  opacity: 0.5;
}

.empty-state__text {
  color: var(--text-dim);
  font-size: 0.88rem;
}

.loading-spinner {
  display: none;
  text-align: center;
  padding: 2rem;
}

.loading-spinner.active { display: block; }

.loading-spinner__dots {
  display: inline-flex;
  gap: 6px;
}

.loading-spinner__dots span {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--accent);
  animation: bounce 1.2s ease-in-out infinite;
}

.loading-spinner__dots span:nth-child(2) { animation-delay: 0.15s; }
.loading-spinner__dots span:nth-child(3) { animation-delay: 0.3s; }

@keyframes bounce {
  0%, 80%, 100% { transform: scale(0.6); opacity: 0.4; }
  40%           { transform: scale(1);    opacity: 1; }
}

/* ---------- Toast / Notification ---------- */
.toast-container {
  position: fixed;
  top: 1.5rem; right: 1.5rem;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.toast {
  background: var(--bg-surface);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  padding: 12px 20px;
  backdrop-filter: blur(16px);
  font-size: 0.82rem;
  color: var(--text-primary);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
  animation: toastIn 0.35s ease, toastOut 0.35s ease 3.5s forwards;
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 260px;
}

.toast--success { border-left: 3px solid var(--emerald); }
.toast--error   { border-left: 3px solid var(--rose); }
.toast--info    { border-left: 3px solid var(--cyan); }

@keyframes toastIn  { from { opacity: 0; transform: translateX(40px); } to { opacity: 1; transform: translateX(0); } }
@keyframes toastOut { to   { opacity: 0; transform: translateX(40px); } }

/* ---------- File List ---------- */
.file-list { margin-top: 1.25rem; }

.file-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border-radius: var(--radius-xs);
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid transparent;
  margin-bottom: 6px;
  font-size: 0.82rem;
  transition: var(--transition);
}

.file-item:hover { border-color: var(--glass-border); }
.file-item__icon { font-size: 1rem; }
.file-item__name { flex: 1; color: var(--text-muted); font-family: var(--font-mono); font-size: 0.78rem; }
.file-item__badge {
  font-size: 0.68rem;
  background: rgba(52, 211, 153, 0.12);
  color: var(--emerald);
  padding: 2px 8px;
  border-radius: 999px;
  font-weight: 600;
}

/* ---------- Knowledge Map ---------- */
.card__icon--map { background: rgba(251, 113, 133, 0.15); }

.map-container {
  position: relative;
  width: 100%;
  height: 420px;
  border-radius: var(--radius-sm);
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid var(--glass-border);
  overflow: hidden;
}

.map-container canvas {
  width: 100% !important;
  height: 100% !important;
}

.map-empty {
  display: none;
  text-align: center;
  padding: 3rem 1rem;
}

.map-empty.active { display: block; }
.map-container.hidden { display: none; }

.map-tooltip {
  display: none;
  position: absolute;
  background: rgba(12, 12, 28, 0.92);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xs);
  padding: 10px 14px;
  font-size: 0.78rem;
  color: var(--text-primary);
  max-width: 320px;
  pointer-events: none;
  backdrop-filter: blur(12px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
  z-index: 10;
  line-height: 1.5;
}

.map-tooltip.active { display: block; }

.map-tooltip__source {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--accent-light);
  margin-bottom: 4px;
}

.map-tooltip__text {
  color: var(--text-muted);
}

.map-refresh-btn {
  margin-left: auto;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xs);
  color: var(--text-muted);
  width: 32px; height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1.1rem;
  transition: var(--transition);
}

.map-refresh-btn:hover {
  background: var(--glass-hover);
  color: var(--text-primary);
  transform: rotate(90deg);
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .grid { grid-template-columns: 1fr; }
  .header__title { font-size: 1.75rem; }
  .app-wrapper { padding: 1.25rem 1rem 3rem; }
  .stats-bar { gap: 0.75rem; }
  .map-container { height: 300px; }
}

/* ---------- Scrollbar ---------- */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(255, 255, 255, 0.1); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(255, 255, 255, 0.18); }

body.light-theme::-webkit-scrollbar-thumb { background: rgba(0, 0, 0, 0.12); }
body.light-theme::-webkit-scrollbar-thumb:hover { background: rgba(0, 0, 0, 0.22); }