/* ==========================================================================
   OgbonMath — AI Conversation History UI
   --------------------------------------------------------------------------
   Styles for:
     - AI Tutor conversation switcher dropdown (Claude-style)
     - AI Tutor header with current-conversation label + "+ New" button
     - Math Hub recent-problems list with per-entry delete
   ========================================================================== */

/* ==========================================================================
   AI TUTOR — header + switcher
   ==========================================================================
*/
body[data-view="tutor"] #ct .ai-tutor-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-3);
  margin-bottom: var(--sp-2);
  flex-wrap: wrap;
}

body[data-view="tutor"] #ct .ai-tutor-controls {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
}

.ai-convo-trigger {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  padding: 6px 10px 6px 12px;
  background: var(--bg3) !important;
  border: 1px solid var(--bdr) !important;
  border-radius: var(--radius-md) !important;
  color: var(--tx1) !important;
  font-family: var(--font-sans) !important;
  font-size: var(--fs-sm) !important;
  font-weight: var(--fw-medium) !important;
  cursor: pointer;
  max-width: 240px;
  min-width: 0;
  transition: border-color var(--dur-fast) var(--ease-out),
              color var(--dur-fast) var(--ease-out);
}

.ai-convo-trigger:hover {
  border-color: var(--ac) !important;
  color: var(--tx) !important;
}

.ai-convo-current-label {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  text-align: left;
}

.ai-convo-new {
  padding: 6px 12px !important;
  background: var(--ac) !important;
  color: var(--ac-tx) !important;
  border: 1px solid var(--ac) !important;
  border-radius: var(--radius-md) !important;
  font-family: var(--font-sans) !important;
  font-size: var(--fs-sm) !important;
  font-weight: var(--fw-semibold) !important;
  cursor: pointer;
  transition: background var(--dur-fast) var(--ease-out);
}

.ai-convo-new:hover {
  background: var(--ac2) !important;
  border-color: var(--ac2) !important;
}

/* ==========================================================================
   Conversation switcher dropdown
   ==========================================================================
   Positioned via fixed coords set in JS. High z-index so it sits above
   the chat log. Max-height with internal scroll so long lists don't
   overflow the viewport.
*/
.ai-convo-list {
  position: fixed;
  z-index: var(--z-dropdown);
  background: var(--bg2);
  border: 1px solid var(--bdr);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  min-width: 280px;
  max-width: 400px;
  max-height: 60vh;
  max-height: 60dvh;
  overflow-y: auto;
  padding: var(--sp-1);
  font-family: var(--font-sans);
  -webkit-overflow-scrolling: touch;
  overscroll-behavior: contain;
  animation: ai-convo-list-in var(--dur-fast) var(--ease-calm);
}

@keyframes ai-convo-list-in {
  from { opacity: 0; transform: translateY(-6px) scale(0.98); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}

.ai-convo-empty {
  padding: var(--sp-5) var(--sp-4);
  text-align: center;
  color: var(--tx2);
  font-size: var(--fs-sm);
}

.ai-convo-row {
  display: flex;
  align-items: stretch;
  gap: 2px;
  border-radius: var(--radius-sm);
  margin-bottom: 2px;
  transition: background var(--dur-fast) var(--ease-out);
}

.ai-convo-row:hover {
  background: var(--hover-bg);
}

.ai-convo-row.is-active {
  background: var(--ac-soft);
}

.ai-convo-row-main {
  flex: 1;
  min-width: 0;
  text-align: left;
  background: transparent !important;
  border: none !important;
  padding: 8px 12px !important;
  cursor: pointer;
  color: var(--tx) !important;
  font-family: var(--font-sans) !important;
}

.ai-convo-row-main:hover { background: transparent !important; }

.ai-convo-row-title {
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--tx);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: 2px;
}

.ai-convo-row.is-active .ai-convo-row-title {
  color: var(--ac);
  font-weight: var(--fw-semibold);
}

.ai-convo-row-meta {
  font-size: var(--fs-xs);
  color: var(--tx3);
  font-family: var(--font-sans);
}

.ai-convo-row-delete {
  width: 30px;
  background: transparent !important;
  border: none !important;
  color: var(--tx3) !important;
  font-size: 18px !important;
  line-height: 1;
  cursor: pointer;
  opacity: 0;
  transition: opacity var(--dur-fast) var(--ease-out),
              color var(--dur-fast) var(--ease-out);
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

.ai-convo-row:hover .ai-convo-row-delete,
.ai-convo-row:focus-within .ai-convo-row-delete {
  opacity: 1;
}

.ai-convo-row-delete:hover {
  color: var(--rd) !important;
  background: var(--rd-bg) !important;
}

/* Mobile: always show delete button (no hover) */
@media (max-width: 768px) {
  .ai-convo-row-delete {
    opacity: 0.6;
  }
}

.ai-convo-footer {
  padding: var(--sp-2) var(--sp-3) var(--sp-1);
  border-top: 1px solid var(--bdr);
  margin-top: var(--sp-1);
}

.ai-convo-delete-all {
  width: 100%;
  background: transparent !important;
  border: 1px solid transparent !important;
  color: var(--rd) !important;
  font-family: var(--font-sans) !important;
  font-size: var(--fs-xs) !important;
  font-weight: var(--fw-medium) !important;
  padding: 6px 10px !important;
  border-radius: var(--radius-sm) !important;
  cursor: pointer;
  transition: background var(--dur-fast) var(--ease-out),
              border-color var(--dur-fast) var(--ease-out);
}

.ai-convo-delete-all:hover {
  background: var(--rd-bg) !important;
  border-color: var(--rd) !important;
}

/* ==========================================================================
   MATH HUB — Recent Problems history
   ==========================================================================
*/
body[data-view="hub"] #ct #hub-history-mount {
  margin-top: var(--sp-8);
}

body[data-view="hub"] #ct .hub-history-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: var(--sp-2);
  margin-bottom: var(--sp-3);
  border-bottom: 1px solid var(--bdr);
}

body[data-view="hub"] #ct .hub-history-title {
  font-family: var(--font-sans) !important;
  font-size: var(--fs-xs) !important;
  font-weight: var(--fw-semibold) !important;
  letter-spacing: var(--ls-widest) !important;
  text-transform: uppercase !important;
  color: var(--tx2) !important;
  margin: 0 !important;
  padding-bottom: 0 !important;
  border-bottom: none !important;
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
}

.hub-history-count {
  color: var(--tx3);
  font-size: var(--fs-xs);
  font-weight: var(--fw-regular);
  text-transform: none;
  letter-spacing: 0;
}

.hub-history-clear-all {
  background: transparent !important;
  color: var(--tx2) !important;
  border: 1px solid var(--bdr) !important;
  border-radius: var(--radius-sm) !important;
  padding: 4px 10px !important;
  font-family: var(--font-sans) !important;
  font-size: var(--fs-xs) !important;
  font-weight: var(--fw-medium) !important;
  cursor: pointer;
  transition: color var(--dur-fast) var(--ease-out),
              border-color var(--dur-fast) var(--ease-out),
              background var(--dur-fast) var(--ease-out);
}

.hub-history-clear-all:hover {
  color: var(--rd) !important;
  border-color: var(--rd) !important;
  background: var(--rd-bg) !important;
}

.hub-history-list {
  display: flex;
  flex-direction: column;
  gap: var(--sp-1);
}

.hub-history-row {
  display: flex;
  align-items: stretch;
  gap: 2px;
  border-radius: var(--radius-md);
  background: var(--bg2);
  border: 1px solid var(--bdr);
  transition: border-color var(--dur-fast) var(--ease-out),
              transform var(--dur-fast) var(--ease-out);
}

.hub-history-row:hover {
  border-color: var(--ac);
  transform: translateX(2px);
}

.hub-history-row-main {
  flex: 1;
  min-width: 0;
  text-align: left;
  background: transparent !important;
  border: none !important;
  padding: 10px 14px !important;
  cursor: pointer;
  color: var(--tx) !important;
  font-family: var(--font-sans) !important;
}

.hub-history-row-main:hover { background: transparent !important; }

.hub-history-query {
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  color: var(--tx);
  margin-bottom: 2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.hub-history-meta {
  font-family: var(--font-sans);
  font-size: var(--fs-xs);
  color: var(--tx3);
}

.hub-history-row-delete {
  width: 40px;
  background: transparent !important;
  border: none !important;
  color: var(--tx3) !important;
  font-size: 18px !important;
  line-height: 1;
  cursor: pointer;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  transition: color var(--dur-fast) var(--ease-out),
              background var(--dur-fast) var(--ease-out);
  flex-shrink: 0;
}

.hub-history-row-delete:hover {
  color: var(--rd) !important;
  background: var(--rd-bg) !important;
}

/* ==========================================================================
   Mobile tweaks
   ==========================================================================
*/
@media (max-width: 560px) {
  body[data-view="tutor"] #ct .ai-tutor-header {
    flex-direction: column;
    align-items: stretch;
  }
  body[data-view="tutor"] #ct .ai-tutor-controls {
    justify-content: space-between;
  }
  .ai-convo-trigger { flex: 1; max-width: none; }
  .ai-convo-list { min-width: 240px; max-width: calc(100vw - 32px); }

  body[data-view="hub"] #ct .hub-history-header {
    flex-wrap: wrap;
    gap: var(--sp-2);
  }
}