/* F.14: Session Cost Tracker + Usage Dashboard */

/* ── Credit badge (header, near user menu) ──────────────────────────────── */
.credit-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  border-radius: 4px;
  background: var(--surface-secondary, rgba(255,255,255,0.06));
  font-size: 0.8rem;
  color: var(--text-secondary, rgba(255,255,255,0.55));
  cursor: pointer;
  border: 1px solid transparent;
  transition: background 0.15s, border-color 0.15s;
  user-select: none;
}
.credit-badge:hover {
  background: var(--surface-hover, rgba(255,255,255,0.1));
  border-color: var(--vc-border, rgba(150,145,175,0.2));
}
.credit-chf {
  opacity: 0.7;
  font-size: 0.75rem;
}
.credit-badge.credit-badge--low { color: #e8a44a; }
.credit-badge.credit-badge--empty { color: #e05c5c; }

/* ── Usage modal overlay ────────────────────────────────────────────────── */
.usage-modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.55);
  z-index: 10000;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 60px;
}
.usage-modal {
  background: var(--vc-panel, #1a1a2e);
  border: 1px solid var(--vc-border, rgba(150,145,175,0.15));
  border-radius: 10px;
  width: 680px;
  max-width: 96vw;
  max-height: 82vh;
  overflow-y: auto;
  box-shadow: 0 20px 60px rgba(0,0,0,0.5);
}
.usage-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 22px 14px;
  border-bottom: 1px solid var(--vc-border, rgba(150,145,175,0.1));
}
.usage-modal-header h2 {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary, #e8e6f0);
}
.usage-modal-close {
  background: none;
  border: none;
  color: var(--text-secondary, rgba(255,255,255,0.5));
  font-size: 1.3rem;
  cursor: pointer;
  line-height: 1;
  padding: 2px 6px;
  border-radius: 4px;
}
.usage-modal-close:hover { background: rgba(255,255,255,0.08); }

/* ── Summary stats strip ────────────────────────────────────────────────── */
.usage-summary {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--vc-border, rgba(150,145,175,0.1));
  margin: 0;
  border-bottom: 1px solid var(--vc-border, rgba(150,145,175,0.1));
}
.usage-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 16px 10px;
  background: var(--vc-panel, #1a1a2e);
}
.usage-value {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--accent, #7b6cf0);
  line-height: 1;
  margin-bottom: 4px;
}
.usage-label {
  font-size: 0.7rem;
  color: var(--text-secondary, rgba(255,255,255,0.45));
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* ── Section headers ────────────────────────────────────────────────────── */
.usage-section {
  padding: 16px 22px 0;
}
.usage-section h4 {
  margin: 0 0 10px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-secondary, rgba(255,255,255,0.45));
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* ── Breakdown bar ──────────────────────────────────────────────────────── */
.usage-breakdown-bar {
  display: flex;
  height: 8px;
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: 10px;
  background: var(--vc-border, rgba(150,145,175,0.1));
}
.usage-breakdown-bar .seg { height: 100%; transition: width 0.4s ease; }
.seg-search      { background: #7b6cf0; }
.seg-synthesis   { background: #5b9cf0; }
.seg-adversarial { background: #e06090; }
.seg-summary     { background: #f0a050; }
.seg-verification{ background: #50c0a0; }
.seg-export      { background: #c08050; }
.seg-other       { background: rgba(255,255,255,0.15); }

.usage-breakdown-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
  margin-bottom: 6px;
}
.usage-leg-item {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 0.72rem;
  color: var(--text-secondary, rgba(255,255,255,0.5));
}
.usage-leg-dot {
  width: 8px;
  height: 8px;
  border-radius: 2px;
  flex-shrink: 0;
}

/* ── Recent sessions table ──────────────────────────────────────────────── */
.usage-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8rem;
}
.usage-table th {
  text-align: left;
  font-weight: 500;
  font-size: 0.7rem;
  color: var(--text-secondary, rgba(255,255,255,0.4));
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 6px 8px;
  border-bottom: 1px solid var(--vc-border, rgba(150,145,175,0.1));
}
.usage-table td {
  padding: 8px 8px;
  border-bottom: 1px solid var(--vc-border, rgba(150,145,175,0.06));
  color: var(--text-primary, #e8e6f0);
  vertical-align: middle;
}
.usage-table tr:last-child td { border-bottom: none; }
.usage-table tr:hover td { background: rgba(255,255,255,0.02); }
.usage-table .col-date { color: var(--text-secondary, rgba(255,255,255,0.45)); font-size: 0.72rem; white-space: nowrap; }
.usage-table .col-query { max-width: 240px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.usage-table .col-credits { text-align: right; color: var(--accent, #7b6cf0); font-weight: 600; }
.usage-table .col-cost { text-align: right; color: var(--text-secondary, rgba(255,255,255,0.5)); font-size: 0.75rem; white-space: nowrap; }

/* ── Session detail view (inside modal) ─────────────────────────────────── */
.usage-session-back {
  background: none;
  border: none;
  color: var(--accent, #7b6cf0);
  font-size: 0.8rem;
  cursor: pointer;
  padding: 0;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 4px;
}
.usage-session-back:hover { text-decoration: underline; }
.usage-phase-list {
  list-style: none;
  padding: 0;
  margin: 0;
}
.usage-phase-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 0;
  border-bottom: 1px solid var(--vc-border, rgba(150,145,175,0.06));
  font-size: 0.8rem;
}
.usage-phase-item:last-child { border-bottom: none; }
.usage-phase-name { color: var(--text-primary, #e8e6f0); }
.usage-phase-model { color: var(--text-secondary, rgba(255,255,255,0.4)); font-size: 0.72rem; }
.usage-phase-credits { color: var(--accent, #7b6cf0); font-weight: 600; min-width: 50px; text-align: right; }

/* ── Loading / empty states ─────────────────────────────────────────────── */
.usage-loading {
  text-align: center;
  padding: 32px 0;
  color: var(--text-secondary, rgba(255,255,255,0.4));
  font-size: 0.85rem;
}
.usage-empty {
  text-align: center;
  padding: 20px 0;
  color: var(--text-secondary, rgba(255,255,255,0.35));
  font-size: 0.8rem;
  font-style: italic;
}

.usage-modal-body { padding: 0 0 18px; }