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

:root {
  --bg: #f8f9fa;
  --bg-card: #ffffff;
  --text: #212529;
  --text-muted: #6c757d;
  --border: #dee2e6;
  --primary: #0d6efd;
  --primary-light: #e7f1ff;
  --success: #198754;
  --danger: #dc3545;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,0.08);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

/* Header */
.header {
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  padding: 12px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.header h1 { font-size: 18px; font-weight: 600; white-space: nowrap; }
.header .controls { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.header input[type="date"],
.header input[type="text"],
.header select {
  padding: 5px 8px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 13px;
}
.header button {
  padding: 5px 14px;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 13px;
  white-space: nowrap;
}
.header button:hover { opacity: 0.9; }
.btn-secondary { background: #6c757d !important; }
.btn-danger { background: var(--danger) !important; }

.container { max-width: 1400px; margin: 0 auto; padding: 24px; }

/* Summary cards */
.summary-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px;
  margin-bottom: 24px;
}
.card {
  background: var(--bg-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 16px;
}
.card .label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
  margin-bottom: 4px;
}
.card .value { font-size: 24px; font-weight: 700; }

/* Charts */
.charts-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 24px;
}
.chart-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 16px;
}
.chart-card h3 { font-size: 13px; font-weight: 600; margin-bottom: 8px; }
.chart-card canvas { width: 100% !important; max-height: 260px; }

/* Session table */
.session-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--bg-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.session-table th,
.session-table td {
  padding: 10px 14px;
  text-align: left;
  font-size: 13px;
  border-bottom: 1px solid var(--border);
}
.session-table th {
  background: var(--bg);
  font-weight: 600;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
  position: sticky;
  top: 0;
}
.session-table tr { cursor: pointer; }
.session-table tr:hover td { background: var(--primary-light); }
.btn-delete {
  padding: 3px 8px;
  font-size: 11px;
  background: transparent;
  color: var(--danger);
  border: 1px solid var(--danger);
  border-radius: 4px;
  cursor: pointer;
}
.btn-delete:hover { background: var(--danger); color: white; }

/* Pagination */
.pagination {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 0;
}
.pagination .page-info { font-size: 13px; color: var(--text-muted); }
.pagination .page-btns { display: flex; gap: 4px; }
.pagination button {
  padding: 5px 10px;
  border: 1px solid var(--border);
  background: var(--bg-card);
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 13px;
  min-width: 32px;
}
.pagination button:disabled { opacity: 0.4; cursor: default; }
.pagination button.active {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

/* Detail page */
.detail-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}
.detail-header button { flex-shrink: 0; }
#detailMeta {
  font-size: 13px;
  color: var(--text-muted);
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}
#detailMeta span { white-space: nowrap; }
#detailMeta strong { color: var(--text); }

.msg-list {
  background: var(--bg-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.msg {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  font-size: 14px;
  white-space: pre-wrap;
  word-break: break-word;
  line-height: 1.6;
}
.msg:last-child { border-bottom: none; }
.msg.user { background: var(--primary-light); }
.msg.assistant { background: var(--bg-card); }
.msg .role-tag {
  display: inline-block;
  font-weight: 600;
  font-size: 11px;
  text-transform: uppercase;
  padding: 2px 6px;
  border-radius: 4px;
  margin-bottom: 6px;
}
.msg.user .role-tag { background: var(--primary); color: white; }
.msg.assistant .role-tag { background: var(--success); color: white; }

/* Auth overlay */
.auth-overlay {
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.4);
  display: flex; align-items: center; justify-content: center;
  z-index: 100;
}
.auth-box {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 32px;
  text-align: center;
  max-width: 420px; min-width: 340px;
}
.auth-box h2 { margin-bottom: 8px; }
.auth-box p { color: var(--text-muted); margin-bottom: 16px; line-height: 1.6; }
.auth-box button {
  width: 100%; padding: 10px;
  background: var(--primary); color: white;
  border: none; border-radius: var(--radius);
  cursor: pointer; font-size: 14px;
}
.auth-box button:hover { opacity: 0.9; }
.device-code {
  font-size: 32px; font-weight: 700; letter-spacing: 4px;
  padding: 16px; background: var(--bg);
  border-radius: var(--radius); margin-bottom: 12px;
  font-family: 'SF Mono', 'Fira Code', monospace;
  user-select: all;
}
.verification-link {
  display: block; color: var(--primary);
  font-size: 14px; margin-bottom: 20px;
}
.login-spinner {
  display: flex; align-items: center; justify-content: center;
  gap: 10px; color: var(--text-muted); font-size: 13px;
}
.spinner {
  width: 18px; height: 18px;
  border: 2px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.error-text { color: var(--danger); }
#userBadge { font-size: 13px; color: var(--text-muted); }

/* Skill table */
.skill-table-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 16px;
  margin-bottom: 24px;
}
.skill-table-card h3 { font-size: 13px; font-weight: 600; margin-bottom: 8px; }
.skill-table { width: 100%; border-collapse: collapse; }
.skill-table th, .skill-table td {
  padding: 8px 12px; text-align: left; font-size: 13px;
  border-bottom: 1px solid var(--border);
}
.skill-table th {
  font-size: 11px; text-transform: uppercase; letter-spacing: 0.5px;
  color: var(--text-muted); background: var(--bg);
}
.skill-tag {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 600;
  background: #e9ecef;
  color: #495057;
  margin: 2px 4px 2px 0;
}
.skill-tag.completed { background: #d1e7dd; color: #0f5132; }
.skill-tag.error { background: #f8d7da; color: #842029; }
.skills-section {
  margin-top: 12px;
  padding: 12px 16px;
  background: var(--bg);
  border-radius: var(--radius);
}
.skills-section h4 { font-size: 12px; font-weight: 600; color: var(--text-muted); margin-bottom: 8px; }
.feedback-table .feedback-content {
  max-width: 620px;
  white-space: pre-wrap;
  word-break: break-word;
}
.link-button {
  padding: 0;
  border: none;
  background: transparent;
  color: var(--primary);
  cursor: pointer;
  font: inherit;
  text-decoration: underline;
}
.muted { color: var(--text-muted); }
.feedback-section {
  width: 100%;
  margin-top: 12px;
  padding: 12px 16px;
  background: var(--bg);
  border-radius: var(--radius);
}
.feedback-section h4 { font-size: 12px; font-weight: 600; color: var(--text-muted); margin-bottom: 8px; }
.feedback-card {
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-card);
  margin-top: 8px;
}
.feedback-card-meta {
  color: var(--text-muted);
  font-size: 11px;
  margin-bottom: 6px;
}
.feedback-card-body {
  color: var(--text);
  font-size: 13px;
  white-space: pre-wrap;
  word-break: break-word;
}

.loading { text-align: center; padding: 40px; color: var(--text-muted); }
.error { text-align: center; padding: 20px; color: var(--danger); }

@media (max-width: 768px) {
  .charts-row { grid-template-columns: 1fr; }
  .summary-row { grid-template-columns: repeat(2, 1fr); }
}