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

:root {
  --bg: #F7F7F8;
  --surface: #FFFFFF;
  --border: #EBEBED;
  --border-lt: #F3F3F5;
  --t1: #111318;
  --t2: #5C5F6A;
  --t3: #9EA3AF;
  --accent: #E8483A;
  --green: #12B76A;
  --green-bg: #ECFDF5;
  --amber: #F59E0B;
  --amber-bg: #FFFBEB;
  --blue: #3B82F6;
  --r-sm: 6px;
  --r-md: 10px;
  --r-lg: 14px;
  --shadow: 0 1px 4px rgba(0,0,0,0.07);
}

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

html, body {
  font-family: 'Inter', sans-serif;
  background: var(--bg);
  color: var(--t1);
  height: 100%;
  font-size: 14px;
}

/* ── LAYOUT ── */
.app-layout {
  display: flex;
  height: 100vh;
  overflow: hidden;
}

/* ── SIDEBAR ── */
.sidebar {
  width: 240px;
  min-width: 240px;
  background: var(--surface);
  border-right: 1px solid var(--border);
  padding: 18px 12px;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  gap: 1px;
}

.sb-profile {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 4px 4px 16px;
}
.sb-avatar {
  width: 36px; height: 36px;
  border-radius: 8px;
  flex-shrink: 0;
  overflow: hidden;
}
.sb-profile-info { display: flex; align-items: center; gap: 4px; }
.sb-name { font-size: 16px; font-weight: 700; color: var(--t1); }
.sb-caret { font-size: 11px; color: var(--t3); }
.sb-divider { height: 1px; background: var(--border); margin: 6px 0; }

.sb-label {
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 0.07em;
  color: var(--t3);
  padding: 12px 8px 5px;
  display: block;
}

.nav-btn {
  background: transparent;
  border: none;
  color: var(--t2);
  font-family: 'Inter', sans-serif;
  font-size: 13.5px;
  font-weight: 500;
  text-align: left;
  padding: 8px 10px;
  border-radius: var(--r-sm);
  width: 100%;
  cursor: pointer;
  margin-bottom: 1px;
  transition: background 0.12s, color 0.12s;
  display: flex;
  align-items: center;
  gap: 9px;
}
.nav-btn:hover { background: var(--bg); color: var(--t1); }
.nav-btn.active {
  background: #2563EB;
  color: #fff;
  font-weight: 600;
}
.nav-btn.active:hover { background: #1D4ED8; }
.nav-btn.active .nav-icon svg { stroke: #fff; }

.nav-sub {
  padding-left: 22px;
  font-size: 13px;
}

.nav-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  width: 18px;
  height: 18px;
  opacity: 0.85;
}

.sb-tag {
  display: flex; align-items: center; gap: 8px;
  font-size: 13.5px; color: var(--t2);
  padding: 7px 10px;
  border-radius: var(--r-sm);
}
.sb-dot { width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0; }
.sb-dot-red  { background: var(--accent); }
.sb-dot-green { background: var(--green); }

.sb-bottom { margin-top: auto; padding-top: 24px; }
.sb-settings {
  display: flex; align-items: center; gap: 9px;
  font-size: 13.5px; color: var(--t2);
  padding: 8px 10px; border-radius: var(--r-sm); cursor: pointer;
}
.sb-settings:hover { background: var(--bg); color: var(--t1); }

/* ── MAIN ── */
.main-content {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
  background: var(--bg);
}

.page { display: none; }
.page.active { display: block; }

.page-title { font-size: 20px; font-weight: 700; color: var(--t1); margin-bottom: 3px; }
.page-sub { font-size: 13px; color: var(--t3); margin-bottom: 16px; }

/* ── TWO-COL LAYOUT (Home) ── */
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  height: calc(100vh - 40px);
}

/* ── PANEL ── */
.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.panel-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-lt);
  font-size: 14px; font-weight: 600; color: var(--t1);
}
.panel-body { padding: 16px 20px; }

/* ── DROP ZONE ── */
.dropzone {
  border: 1.5px dashed var(--border);
  border-radius: var(--r-md);
  background: var(--bg);
  padding: 28px 16px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s;
  margin-bottom: 4px;
}
.dropzone:hover, .dropzone.drag-over { border-color: var(--t3); }
.drop-icon { font-size: 22px; margin-bottom: 8px; }
.drop-title { font-size: 13.5px; font-weight: 500; color: var(--t2); margin-bottom: 4px; }
.drop-sub   { font-size: 12px; color: var(--t3); }

.file-ready-msg { font-size: 13px; color: var(--t2); margin: 8px 0 4px; }
.hidden { display: none !important; }

/* ── BREADCRUMB ── */
.kb-header {
  padding: 4px 20px 10px;
  display: flex; align-items: center; justify-content: space-between;
  border-top: 1px solid var(--border-lt);
}
.breadcrumb { font-size: 13px; color: var(--t3); display: flex; align-items: center; gap: 5px; }
.bc-sep { font-size: 11px; }
.bc-active { color: var(--t1); font-weight: 600; }

/* ── BUTTONS ── */
.btn-primary {
  background: #2563EB;
  color: #fff;
  border: none;
  border-radius: var(--r-sm);
  padding: 8px 16px;
  font-family: 'Inter', sans-serif;
  font-size: 13px; font-weight: 600;
  cursor: pointer;
  transition: background 0.13s;
}
.btn-primary:hover { background: #1D4ED8; }

.btn-accent {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 5px 13px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--r-sm);
  font-family: 'Inter', sans-serif;
  font-size: 12.5px; font-weight: 600;
  cursor: pointer;
}
.btn-accent:hover { background: #d43c2f; }

.btn-secondary {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  padding: 7px 14px;
  font-family: 'Inter', sans-serif;
  font-size: 13px; font-weight: 500;
  color: var(--t2);
  cursor: pointer;
}
.btn-secondary:hover { background: var(--bg); }

/* ── FILE TABLE ── */
.ftable { width: 100%; border-collapse: collapse; }
.ftable th {
  font-size: 11px; font-weight: 600; letter-spacing: 0.06em;
  color: var(--t3); text-align: left;
  padding: 10px 14px; border-bottom: 1px solid var(--border-lt);
}
.ftable td {
  font-size: 13.5px; color: var(--t1);
  padding: 12px 14px; border-bottom: 1px solid var(--border-lt);
  vertical-align: middle;
}
.ftable tr:last-child td { border-bottom: none; }
.ftable tr:hover td { background: var(--bg); }

.fname-cell { display: flex; align-items: center; gap: 9px; font-weight: 500; }
.ficon {
  width: 28px; height: 28px; border-radius: 6px;
  display: flex; align-items: center; justify-content: center;
  font-size: 13px; flex-shrink: 0;
}
.ficon-pdf  { background: #FEE2E2; }
.ficon-docx { background: #DBEAFE; }
.ficon-pptx { background: #FFEDD5; }
.ficon-txt  { background: #F1F5F9; }
.ficon-md   { background: #F1F5F9; }

.badge {
  display: inline-flex; align-items: center;
  padding: 3px 9px; border-radius: 20px;
  font-size: 11.5px; font-weight: 600;
}
.badge-indexed    { background: var(--green-bg); color: #065F46; }
.badge-processing { background: var(--amber-bg); color: #92400E; }
.badge-error      { background: #FEE2E2; color: #991B1B; }

.empty-cell { text-align: center; color: var(--t3); padding: 32px; font-size: 13.5px; }

/* ── CHAT ── */
.chat-panel {
  display: flex;
  flex-direction: column;
  height: 100%;
  overflow: hidden;
}
.chat-panel-full {
  display: flex;
  flex-direction: column;
  height: calc(100vh - 160px);
}

.chat-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 20px;
  border-bottom: 1px solid var(--border-lt);
  flex-shrink: 0;
}
.chat-header-left { display: flex; align-items: center; gap: 10px; }
.chat-av-ai {
  width: 32px; height: 32px; border-radius: 50%;
  background: #EBEBED;
  display: flex; align-items: center; justify-content: center;
  font-size: 15px; flex-shrink: 0;
}
.chat-av-user {
  width: 32px; height: 32px; border-radius: 50%;
  background: linear-gradient(135deg, #667EEA, #764BA2);
  color: #fff; font-size: 10px; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.chat-name  { font-size: 14px; font-weight: 600; color: var(--t1); }
.chat-status { font-size: 11px; color: var(--green); font-weight: 500; }
.chat-plus  { font-size: 20px; color: var(--t3); cursor: pointer; line-height: 1; }

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 16px 20px 4px;
}

.chat-row {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  margin-bottom: 14px;
}
.chat-row.user {
  flex-direction: row-reverse;
}

.chat-bubble { display: inline-block; max-width: 85%; font-size: 13.5px; line-height: 1.55; }
.ai-bubble {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px 14px 14px 14px;
  padding: 11px 14px;
  color: var(--t1);
}
.user-bubble {
  background: #1C1F27;
  border-radius: 14px 4px 14px 14px;
  padding: 11px 14px;
  color: #F4F5F7;
}
.chat-ts { font-size: 10px; color: var(--t3); margin-top: 4px; }

.citations-row { margin: -8px 0 14px 42px; }
.c-chip {
  display: inline-flex; align-items: center; gap: 5px;
  background: var(--bg); border: 1px solid var(--border);
  border-radius: 20px; padding: 2px 9px 2px 3px;
  font-size: 11px; color: var(--t2); margin: 2px 2px 0 0;
}
.c-idx {
  background: var(--blue); color: #fff;
  width: 16px; height: 16px; border-radius: 50%;
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 9px; font-weight: 700; flex-shrink: 0;
}
.c-score { color: var(--green); font-weight: 600; }

.chat-input-area {
  padding: 10px 20px 12px;
  border-top: 1px solid var(--border-lt);
  flex-shrink: 0;
}
.chat-input-wrap {
  display: flex;
  gap: 8px;
  align-items: center;
}
.chat-input {
  flex: 1;
  border: 1.5px solid var(--border);
  border-radius: var(--r-md);
  padding: 9px 14px;
  font-family: 'Inter', sans-serif;
  font-size: 13.5px;
  color: var(--t1);
  background: var(--surface);
  outline: none;
  transition: border-color 0.15s;
}
.chat-input:focus { border-color: #B0B5BF; }
.chat-send-btn {
  background: #2563EB;
  color: #fff;
  border: none;
  border-radius: var(--r-sm);
  width: 36px; height: 36px;
  cursor: pointer;
  font-size: 14px;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  transition: background 0.13s;
}
.chat-send-btn:hover { background: #1D4ED8; }
.chat-disclaimer { font-size: 10.5px; color: var(--t3); text-align: center; margin-top: 6px; }

/* ── SEARCH PAGE ── */
.search-bar {
  display: flex; gap: 10px; align-items: center;
}
.search-text-input {
  flex: 1;
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  padding: 8px 12px;
  font-family: 'Inter', sans-serif;
  font-size: 13.5px;
  color: var(--t1);
  outline: none;
}
.search-text-input:focus { border-color: #B0B5BF; }
.search-select {
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  padding: 8px 10px;
  font-family: 'Inter', sans-serif;
  font-size: 13.5px;
  color: var(--t1);
  background: var(--surface);
  outline: none;
  cursor: pointer;
}

.search-result {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow);
  padding: 14px 18px;
  margin-bottom: 10px;
}
.sr-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 10px; flex-wrap: wrap; gap: 6px;
}
.sr-left { display: flex; align-items: center; gap: 8px; }
.sr-idx {
  background: var(--blue); color: #fff;
  border-radius: 50%; width: 20px; height: 20px;
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 10px; font-weight: 700;
}
.sr-name { font-size: 14px; font-weight: 600; color: var(--t1); }
.sr-type {
  font-size: 10px; font-weight: 600;
  padding: 1px 7px; border-radius: 4px;
}
.sr-page { font-size: 12px; color: var(--t3); }
.sr-score {
  background: var(--green-bg); color: #065F46;
  border: 1px solid #D1FAE5;
  font-size: 12px; font-weight: 600;
  padding: 3px 10px; border-radius: 20px;
}
.sr-text {
  font-size: 13px; color: #334155; line-height: 1.55;
  background: var(--bg); padding: 10px 12px;
  border-radius: 6px; border: 1px solid var(--border);
  font-family: monospace;
}

/* ── SUMMARY PAGE ── */
.summary-bar { display: flex; gap: 10px; align-items: center; }
.summary-content {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow);
  padding: 20px 24px;
  font-size: 13.5px; color: var(--t1); line-height: 1.65;
  white-space: pre-wrap;
}

/* ── STATUS MESSAGES ── */
.status-msg {
  font-size: 13px; padding: 8px 12px; border-radius: var(--r-sm);
  margin-top: 8px;
}
.status-success { background: var(--green-bg); color: #065F46; }
.status-error   { background: #FEE2E2; color: #991B1B; }
.status-info    { background: #DBEAFE; color: #1E40AF; }

/* ── SCROLLBAR ── */
::-webkit-scrollbar { width: 4px; height: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: #D4D7DF; border-radius: 3px; }

/* loading spinner */
.spinner {
  display: inline-block; width: 14px; height: 14px;
  border: 2px solid var(--border);
  border-top-color: var(--t2);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  vertical-align: middle; margin-right: 6px;
}
@keyframes spin { to { transform: rotate(360deg); } }
/*
 ── MOBILE TOPBAR ── */
.topbar {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 52px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  align-items: center;
  padding: 0 16px;
  gap: 12px;
  z-index: 200;
}
.topbar-title { font-size: 15px; font-weight: 700; color: var(--t1); }

.hamburger {
  background: none; border: none; cursor: pointer;
  display: flex; flex-direction: column; gap: 5px; padding: 4px;
}
.hamburger span {
  display: block; width: 20px; height: 2px;
  background: var(--t1); border-radius: 2px;
  transition: all 0.2s;
}
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.sidebar-overlay {
  display: none;
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.35);
  z-index: 149;
}
.sidebar-overlay.visible { display: block; }

/* ── RESPONSIVE BREAKPOINTS ── */

/* Tablet: collapse sidebar, stack home columns */
@media (max-width: 900px) {
  .topbar { display: flex; }

  .app-layout { flex-direction: column; }

  .sidebar {
    position: fixed;
    top: 0; left: 0;
    height: 100vh;
    width: 260px;
    transform: translateX(-100%);
    transition: transform 0.25s ease;
    z-index: 150;
    padding-top: 64px;
  }
  .sidebar.open { transform: translateX(0); }

  .main-content {
    padding: 72px 16px 20px;
    height: 100vh;
    overflow-y: auto;
  }

  .two-col {
    grid-template-columns: 1fr;
    height: auto;
  }

  .chat-panel {
    height: 480px;
  }

  .chat-panel-full {
    height: calc(100vh - 200px);
  }
}

/* Mobile: tighter spacing */
@media (max-width: 600px) {
  .main-content { padding: 64px 10px 16px; }

  .panel-body { padding: 12px 14px; }
  .panel-header { padding: 12px 14px; }

  .kb-header { padding: 4px 14px 10px; flex-wrap: wrap; gap: 8px; }

  .ftable th, .ftable td { padding: 8px 10px; font-size: 12px; }

  /* Hide ADDED + SIZE columns on small screens */
  .ftable th:nth-child(3),
  .ftable td:nth-child(3),
  .ftable th:nth-child(4),
  .ftable td:nth-child(4) { display: none; }

  .search-bar { flex-wrap: wrap; }
  .search-text-input { width: 100%; }
  .search-select { width: 80px; }

  .summary-bar { flex-wrap: wrap; }
  .summary-bar select { width: 100%; }
  .summary-bar .btn-primary { width: 100%; }

  .chat-bubble { max-width: 95%; }

  .sr-header { flex-direction: column; align-items: flex-start; }
  .sr-left { flex-wrap: wrap; }

  .chat-panel { height: 420px; }
  .chat-panel-full { height: calc(100vh - 180px); }

  .dropzone { padding: 20px 12px; }
}

/* ── WELCOME MODAL ── */
.modal-backdrop {
  position: fixed; inset: 0;
  background: rgba(10, 12, 20, 0.55);
  backdrop-filter: blur(4px);
  display: flex; align-items: center; justify-content: center;
  z-index: 999;
  padding: 20px;
  animation: fadeIn 0.2s ease;
}
.modal-backdrop.hidden { display: none !important; }

@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes slideUp { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }

.modal-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 18px;
  box-shadow: 0 24px 64px rgba(0,0,0,0.18);
  padding: 36px 36px 28px;
  max-width: 460px;
  width: 100%;
  animation: slideUp 0.25s ease;
}

.modal-icon {
  margin-bottom: 18px;
}

.modal-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--t1);
  margin-bottom: 10px;
  line-height: 1.3;
}

.modal-desc {
  font-size: 13.5px;
  color: var(--t2);
  line-height: 1.6;
  margin-bottom: 16px;
}

.modal-alert {
  display: flex;
  gap: 10px;
  background: #FFFBEB;
  border: 1px solid #FDE68A;
  border-radius: var(--r-md);
  padding: 12px 14px;
  font-size: 13px;
  color: #92400E;
  line-height: 1.55;
  margin-bottom: 20px;
}
.modal-alert-icon {
  flex-shrink: 0;
  margin-top: 2px;
  color: #D97706;
}

.modal-steps {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 28px;
}
.modal-step {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: var(--t2);
}
.modal-step a { color: #2563EB; text-decoration: none; }
.modal-step a:hover { text-decoration: underline; }
.modal-step code {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1px 6px;
  font-size: 12px;
  color: var(--t1);
  font-family: monospace;
}
.step-num {
  width: 22px; height: 22px;
  border-radius: 50%;
  background: #EFF6FF;
  color: #2563EB;
  font-size: 11px; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}

.modal-actions {
  display: flex;
  gap: 10px;
  justify-content: flex-end;
  border-top: 1px solid var(--border-lt);
  padding-top: 20px;
}

.modal-btn-ghost {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 9px 16px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  font-family: 'Inter', sans-serif;
  font-size: 13px; font-weight: 600;
  color: var(--t2);
  text-decoration: none;
  cursor: pointer;
  transition: all 0.13s;
}
.modal-btn-ghost:hover { background: var(--border); color: var(--t1); }

.modal-btn-primary {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 9px 20px;
  background: #2563EB;
  border: none;
  border-radius: var(--r-sm);
  font-family: 'Inter', sans-serif;
  font-size: 13px; font-weight: 600;
  color: #fff;
  cursor: pointer;
  transition: background 0.13s;
}
.modal-btn-primary:hover { background: #1D4ED8; }

@media (max-width: 500px) {
  .modal-box { padding: 24px 20px 20px; }
  .modal-actions { flex-direction: column-reverse; }
  .modal-btn-ghost, .modal-btn-primary { width: 100%; justify-content: center; }
}