:root {
  --primary: #667eea;
  --primary-dark: #764ba2;
  --bg: #f0f4f8;
  --surface: #ffffff;
  --border: #e2e8f0;
  --text: #2d3748;
  --muted: #718096;
  --success: #38a169;
  --danger: #e53e3e;
  --warn: #d69e2e;
  --radius: 12px;
  --shadow: 0 4px 20px rgba(0,0,0,0.08);
}

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

body {
  font-family: 'Segoe UI', Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

/* ── Navbar ── */
.navbar {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  padding: 0 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
  box-shadow: 0 2px 12px rgba(102,126,234,0.35);
}
.navbar-brand {
  color: #fff;
  font-size: 20px;
  font-weight: 700;
  text-decoration: none;
  letter-spacing: 0.5px;
}
.navbar-nav { display: flex; gap: 8px; }
.nav-link {
  color: rgba(255,255,255,0.85);
  text-decoration: none;
  padding: 6px 14px;
  border-radius: 6px;
  font-size: 14px;
  transition: background 0.2s;
}
.nav-link:hover, .nav-link.active { background: rgba(255,255,255,0.15); color: #fff; }

/* ── Layout ── */
.container { max-width: 1100px; margin: 0 auto; padding: 32px 24px; }
.page-title { font-size: 26px; font-weight: 700; color: var(--text); margin-bottom: 4px; }
.page-sub   { color: var(--muted); font-size: 14px; margin-bottom: 28px; }

/* ── Cards ── */
.card {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}
.card-header {
  padding: 18px 24px;
  border-bottom: 1px solid var(--border);
  font-weight: 600;
  font-size: 15px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.card-body { padding: 24px; }

/* ── Upload Drop Zone ── */
.drop-zone {
  border: 2px dashed var(--primary);
  border-radius: var(--radius);
  padding: 56px 24px;
  text-align: center;
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s;
  background: #f7f9ff;
  position: relative;
}
.drop-zone.dragover { background: #eef1ff; border-color: var(--primary-dark); }
.drop-zone input[type="file"] {
  position: absolute; inset: 0; opacity: 0; cursor: pointer; width: 100%; height: 100%;
}
.drop-icon { font-size: 48px; margin-bottom: 16px; }
.drop-title { font-size: 18px; font-weight: 600; color: var(--text); margin-bottom: 6px; }
.drop-sub   { font-size: 13px; color: var(--muted); }
.file-name  { margin-top: 14px; font-size: 13px; color: var(--primary); font-weight: 500; }

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 22px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: opacity 0.2s, transform 0.1s;
}
.btn:hover   { opacity: 0.88; }
.btn:active  { transform: scale(0.97); }
.btn-primary { background: linear-gradient(135deg, var(--primary), var(--primary-dark)); color: #fff; }
.btn-outline { background: transparent; border: 1px solid var(--border); color: var(--text); }
.btn-success { background: var(--success); color: #fff; }
.btn-danger  { background: var(--danger);  color: #fff; }
.btn-sm { padding: 6px 14px; font-size: 12px; }
.btn-lg { padding: 13px 28px; font-size: 16px; }
.btn-full { width: 100%; justify-content: center; margin-top: 20px; }

/* ── Alerts ── */
.alert {
  padding: 13px 18px;
  border-radius: 8px;
  font-size: 14px;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.alert-success { background: #f0fff4; color: var(--success); border: 1px solid #c6f6d5; }
.alert-error   { background: #fff5f5; color: var(--danger);  border: 1px solid #fed7d7; }
.alert-info    { background: #ebf8ff; color: #2b6cb0;        border: 1px solid #bee3f8; }

/* ── Stats bar ── */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}
.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
  box-shadow: var(--shadow);
}
.stat-label { font-size: 11px; text-transform: uppercase; letter-spacing: 1.5px; color: var(--muted); margin-bottom: 6px; }
.stat-value { font-size: 28px; font-weight: 700; color: var(--primary); }

/* ── Table ── */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 13px; }
thead th {
  background: #f7f9fc;
  border-bottom: 2px solid var(--border);
  padding: 10px 14px;
  text-align: left;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--muted);
  white-space: nowrap;
}
tbody td {
  padding: 11px 14px;
  border-bottom: 1px solid var(--border);
  color: var(--text);
  vertical-align: middle;
}
tbody tr:last-child td { border-bottom: none; }
tbody tr:hover { background: #fafbff; }

/* ── Badge ── */
.badge {
  display: inline-block;
  padding: 2px 9px;
  border-radius: 99px;
  font-size: 11px;
  font-weight: 600;
}
.badge-green  { background: #c6f6d5; color: #276749; }
.badge-blue   { background: #bee3f8; color: #2c5282; }
.badge-yellow { background: #fefcbf; color: #744210; }
.badge-red    { background: #fed7d7; color: #742a2a; }

/* ── Pagination ── */
.pagination { display: flex; gap: 6px; justify-content: center; margin-top: 20px; flex-wrap: wrap; }
.page-btn {
  padding: 6px 12px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--surface);
  font-size: 13px;
  cursor: pointer;
  color: var(--text);
  text-decoration: none;
}
.page-btn.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.page-btn:hover:not(.active) { background: #f0f4f8; }

/* ── JSON viewer ── */
.json-viewer {
  background: #1e1e2e;
  color: #cdd6f4;
  border-radius: 8px;
  padding: 20px;
  font-family: 'Consolas', monospace;
  font-size: 13px;
  overflow: auto;
  max-height: 480px;
  line-height: 1.6;
  white-space: pre-wrap;
}

/* ── Search / toolbar ── */
.toolbar { display: flex; gap: 12px; align-items: center; margin-bottom: 16px; flex-wrap: wrap; }
.search-input {
  flex: 1;
  min-width: 200px;
  padding: 9px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  outline: none;
  transition: border-color 0.2s;
}
.search-input:focus { border-color: var(--primary); }

/* ── Column filter pills ── */
.col-pills { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 16px; }
.col-pill {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 12px;
  border-radius: 99px;
  border: 1px solid var(--border);
  font-size: 12px;
  cursor: pointer;
  background: var(--surface);
  transition: background 0.15s;
}
.col-pill.on  { background: var(--primary); color: #fff; border-color: var(--primary); }

/* ── Tabs ── */
.tabs { display: flex; gap: 0; border-bottom: 2px solid var(--border); margin-bottom: 24px; }
.tab-btn {
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 500;
  border: none;
  background: none;
  cursor: pointer;
  color: var(--muted);
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  transition: color 0.2s;
}
.tab-btn.active { color: var(--primary); border-bottom-color: var(--primary); font-weight: 600; }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ── Spinner ── */
.spinner {
  display: none;
  width: 22px; height: 22px;
  border: 3px solid rgba(255,255,255,0.4);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Responsive ── */
@media (max-width: 640px) {
  .navbar { padding: 0 16px; }
  .container { padding: 20px 14px; }
  .stats-bar { grid-template-columns: 1fr 1fr; }
}