/*
 * Studio surfaces: AI Chat (including multi-model cards) and the credit add-on card.
 *
 * Namespaced (.ac / .addon) so nothing here collides with the older
 * .chat-* rules still used elsewhere.
 */

/* ============================================================
   AI CHAT
   ============================================================ */

.page-chat .content {
  padding: 0 !important;
  overflow: hidden;
  min-width: 0;
}

.ac {
  --ac-rail: 260px;
  display: grid;
  grid-template-columns: var(--ac-rail) minmax(0, 1fr);
  height: calc(100dvh - var(--topbar-h, 60px));
  min-height: 0;
  min-width: 0;
  background: var(--bg);
  color: var(--text);
}

/* ---- conversation rail ---- */

.ac__rail {
  display: flex;
  flex-direction: column;
  min-height: 0;
  border-right: 1px solid var(--border);
  background: var(--panel);
}
.ac__rail-head {
  padding: 14px 12px 10px;
}
.ac__rail-new {
  width: 100%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 14px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--text);
  font: inherit;
  font-size: 13.5px;
  font-weight: 600;
  cursor: pointer;
  transition: border-color 150ms ease, background 150ms ease;
}
.ac__rail-new:hover {
  border-color: var(--primary);
  background: var(--panel);
}
.ac__rail-list {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  padding: 0 8px 14px;
  display: grid;
  gap: 2px;
  align-content: start;
}
.ac__convo {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 8px;
  padding: 9px 10px;
  border-radius: 9px;
  color: var(--text);
  text-decoration: none;
  font-size: 13px;
}
.ac__convo:hover { background: var(--panel-2); }
.ac__convo.is-active {
  background: color-mix(in srgb, var(--primary) 14%, transparent);
  font-weight: 600;
}
.ac__convo-title {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.ac__convo-date {
  font-size: 11px;
  color: var(--muted);
}
.ac__rail-empty {
  margin: 8px 10px;
  font-size: 12.5px;
  color: var(--muted);
}

/* ---- main column ---- */

.ac__main {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  min-width: 0;
  min-height: 0;
}

.ac__topbar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
  background: var(--bg);
}
.ac__brand {
  font-size: 13px;
  font-weight: 600;
  color: var(--muted);
  white-space: nowrap;
}
.ac__icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border: 0;
  border-radius: 8px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
}
.ac__icon-btn:hover { background: var(--panel-2); color: var(--text); }

/* model picker */
.ac__model { position: relative; }
.ac__model-btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 6px 12px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--panel);
  color: var(--text);
  font: inherit;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
}
.ac__model-btn:hover { border-color: var(--primary); }
.ac__model-menu {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  z-index: 40;
  min-width: 0;
  width: min(250px, calc(100vw - 24px));
  max-height: min(320px, 50vh);
  overflow-y: auto;
  padding: 6px;
  display: grid;
  gap: 2px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--panel);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.28);
}
.ac__model-option {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  width: 100%;
  padding: 8px 10px;
  border: 0;
  border-radius: 8px;
  background: transparent;
  color: var(--text);
  font: inherit;
  font-size: 13px;
  text-align: left;
  cursor: pointer;
}
.ac__model-option:hover:not(:disabled) { background: var(--panel-2); }
.ac__model-option.is-active { background: color-mix(in srgb, var(--primary) 16%, transparent); }
.ac__model-option:disabled { opacity: 0.45; cursor: not-allowed; }
.ac__model-option-meta { font-size: 11.5px; color: var(--muted); white-space: nowrap; }
.ac__model-empty { margin: 8px; font-size: 12.5px; color: var(--muted); }

/* overflow menu */
.ac__more { position: relative; margin-left: auto; }
.ac__more-menu {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  z-index: 40;
  width: min(340px, calc(100vw - 24px));
  max-height: min(70vh, 520px);
  overflow: auto;
  padding: 12px;
  display: grid;
  gap: 10px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--panel);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.28);
}
.ac__option-builder .studio-option-row,
.ac__option-builder .mob-field {
  margin-bottom: 8px;
}
.ac__option-empty { font-size: 12px; margin: 0; }
.ac__advanced {
  margin: 8px 0 0;
  font-size: 13px;
}
.ac__advanced summary {
  cursor: pointer;
  color: var(--muted, #888);
}
.ac__attach-hint { font-size: 12px; margin: 6px 12px 0; }
.ac__field { display: grid; gap: 5px; font-size: 12px; color: var(--muted); }
.ac__field input {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel-2);
  color: var(--text);
  font: inherit;
  font-size: 13px;
}
.ac__more-action {
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: transparent;
  color: var(--text);
  font: inherit;
  font-size: 13px;
  text-align: left;
  cursor: pointer;
}
.ac__more-action:hover { background: var(--panel-2); }
.ac__more-action.is-danger { color: var(--danger, #ef4444); }

/* ---- transcript ---- */

.ac__scroll {
  overflow-y: auto;
  overflow-x: hidden;
  padding: 26px 16px 8px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  scroll-behavior: smooth;
}

.ac__welcome {
  margin: auto;
  max-width: 760px;
  text-align: center;
  padding: 20px 8px 40px;
}
.ac__welcome-kicker {
  margin: 0 0 6px;
  font-size: 14px;
  color: var(--muted);
}
.ac__welcome-title {
  margin: 0 0 22px;
  font-size: clamp(1.5rem, 3.4vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.01em;
}
.ac__chips {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
}
.ac__chip {
  padding: 8px 14px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--panel);
  color: var(--text);
  font: inherit;
  font-size: 12.5px;
  cursor: pointer;
  transition: border-color 150ms ease, transform 150ms ease;
}
.ac__chip:hover {
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-1px);
}

.ac__msg {
  display: flex;
  gap: 12px;
  width: 100%;
  max-width: 820px;
  margin: 0 auto;
}
.ac__msg.is-user { justify-content: flex-end; }
.ac__avatar {
  flex: 0 0 auto;
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: color-mix(in srgb, var(--primary) 18%, transparent);
  color: var(--primary);
}
.ac__msg-body { min-width: 0; }
.ac__msg.is-user .ac__msg-body {
  max-width: 78%;
  padding: 11px 15px;
  border-radius: 18px 18px 4px 18px;
  background: color-mix(in srgb, var(--primary) 14%, var(--panel));
  border: 1px solid var(--border);
}
.ac__msg-content {
  font-size: 14.5px;
  line-height: 1.65;
  overflow-wrap: anywhere;
}
.ac__msg-content h3,
.ac__msg-content h4 { margin: 14px 0 6px; font-size: 15px; }
.ac__msg-content code {
  padding: 1px 5px;
  border-radius: 5px;
  background: var(--panel-2);
  font-size: 0.9em;
}
.ac__code {
  position: relative;
  margin: 10px 0;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--panel-2);
  overflow-x: auto;
}
.ac__code code { background: none; padding: 0; font-size: 12.5px; line-height: 1.6; }
.ac__code-copy {
  position: absolute;
  top: 6px;
  right: 6px;
  padding: 3px 9px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--panel);
  color: var(--muted);
  font: inherit;
  font-size: 11px;
  cursor: pointer;
}
.ac__msg-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 8px;
  opacity: 0;
  transition: opacity 150ms ease;
}
.ac__msg:hover .ac__msg-actions { opacity: 1; }
.ac__msg-action {
  border: 0;
  background: none;
  padding: 0;
  color: var(--muted);
  font: inherit;
  font-size: 12px;
  cursor: pointer;
}
.ac__msg-action:hover { color: var(--text); }
.ac__msg-model { font-size: 11.5px; color: var(--muted); }
.ac__error { color: var(--danger, #ef4444); font-size: 13.5px; }

.ac__typing { display: inline-flex; gap: 4px; align-items: center; height: 20px; }
.ac__typing i {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--muted);
  animation: ac-bounce 1.2s infinite ease-in-out;
}
.ac__typing i:nth-child(2) { animation-delay: 0.15s; }
.ac__typing i:nth-child(3) { animation-delay: 0.3s; }
@keyframes ac-bounce {
  0%, 60%, 100% { transform: translateY(0); opacity: 0.45; }
  30% { transform: translateY(-4px); opacity: 1; }
}

/* ---- composer ---- */

.ac__composer-wrap { padding: 10px 16px 16px; }
.ac__notice {
  max-width: 820px;
  margin: 0 auto 10px;
  padding: 9px 14px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--muted);
  font-size: 12.5px;
}
.ac__composer {
  display: flex;
  align-items: flex-end;
  gap: 6px;
  max-width: 820px;
  margin: 0 auto;
  min-width: 0;
  padding: 7px 8px 7px 10px;
  border: 1px solid var(--border);
  border-radius: 26px;
  background: var(--panel);
  box-shadow: 0 6px 22px rgba(0, 0, 0, 0.12);
  transition: border-color 150ms ease;
}
.ac__composer:focus-within { border-color: var(--primary); }
.ac__composer textarea {
  flex: 1;
  min-width: 0;
  min-height: 26px;
  max-height: 180px;
  padding: 6px 4px;
  border: 0;
  background: none;
  color: var(--text);
  font: inherit;
  font-size: 14.5px;
  line-height: 1.5;
  resize: none;
  outline: none;
}
.ac__multi-btn {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  max-width: 42%;
  min-width: 0;
  height: 34px;
  padding: 0 10px 0 8px;
  border: 0;
  border-radius: 999px;
  background: var(--panel-2);
  color: var(--text);
  font: inherit;
  font-size: 12.5px;
  cursor: pointer;
}
.ac__multi-btn span {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.ac__multi-btn.is-on,
.ac__multi-btn:hover { background: color-mix(in srgb, var(--primary) 16%, var(--panel-2)); }
.ac__replies {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 240px), 1fr));
  gap: 10px;
  max-width: 920px;
  margin: 0 auto 14px;
  min-width: 0;
}
.ac__card {
  min-width: 0;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--panel);
  overflow-wrap: anywhere;
}
.ac__card.is-loading .ac__card-actions { opacity: 0.4; pointer-events: none; }
body.ac-modal-open { overflow: hidden; }
.ac__card-head {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  align-items: center;
  margin-bottom: 8px;
}
.ac__card-head strong { font-size: 13px; }
.ac__card-actions { display: flex; gap: 6px; }
.ac__card.is-error { border-color: color-mix(in srgb, var(--danger, #ef4444) 40%, var(--border)); }
.ac-modal[hidden] { display: none; }
.ac-modal {
  position: fixed;
  inset: 0;
  z-index: 80;
  display: grid;
  place-items: center;
  padding: 16px;
}
.ac-modal__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(10, 8, 16, 0.55);
}
.ac-modal__panel {
  position: relative;
  z-index: 1;
  width: min(860px, 100%);
  max-height: min(86dvh, 760px);
  display: flex;
  flex-direction: column;
  min-width: 0;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 20px;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.28);
}
.ac-modal__head,
.ac-modal__foot {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 16px 18px;
}
.ac-modal__head h2 { margin: 0; font-size: 1.15rem; }
.ac-modal__filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  padding: 0 18px 12px;
}
.ac-modal__search { flex: 1 1 180px; }
.ac-modal__search input,
.ac-modal__filters select {
  width: 100%;
  min-height: 36px;
  padding: 6px 12px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--panel-2);
  color: var(--text);
}
.ac-modal__chip {
  font-size: 12px;
  padding: 5px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--muted);
}
.ac-modal__chip.is-on { color: var(--text); border-color: color-mix(in srgb, var(--primary) 50%, var(--border)); }
.ac-modal__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 220px), 1fr));
  gap: 10px;
  padding: 0 18px 16px;
  overflow: auto;
  min-height: 0;
}
.ac-modal__card {
  display: grid;
  gap: 6px;
  min-width: 0;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--panel-2);
  cursor: pointer;
}
.ac-modal__card input { position: absolute; opacity: 0; pointer-events: none; }
.ac-modal__card-top {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  align-items: flex-start;
}
.ac-modal__switch {
  width: 32px;
  height: 18px;
  border-radius: 999px;
  background: #c8c4d0;
  position: relative;
  flex: 0 0 auto;
}
.ac-modal__switch::after {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: #fff;
}
.ac-modal__card.is-on { border-color: var(--primary); }
.ac-modal__card.is-on .ac-modal__switch { background: var(--primary); }
.ac-modal__card.is-on .ac-modal__switch::after { left: 16px; }
.ac-modal__card.is-disabled { opacity: 0.5; cursor: not-allowed; }

.ac__attach,
.ac__regen,
.ac__stop,
.ac__send {
  flex: 0 0 auto;
  display: inline-grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border: 0;
  border-radius: 50%;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  transition: background 150ms ease, color 150ms ease;
}
.ac__attach:hover,
.ac__regen:hover,
.ac__stop:hover { background: var(--panel-2); color: var(--text); }
.ac__send {
  background: var(--primary);
  color: #fff;
}
.ac__send:hover { filter: brightness(1.08); }
.ac__send:disabled { opacity: 0.5; cursor: not-allowed; }
.ac__foot {
  max-width: 820px;
  margin: 9px auto 0;
  text-align: center;
  font-size: 11.5px;
  color: var(--muted);
}
.ac__foot-link {
  border: 0;
  background: none;
  padding: 0;
  color: var(--primary);
  font: inherit;
  font-size: inherit;
  cursor: pointer;
  text-decoration: underline;
}

@media (max-width: 900px) {
  .page-chat .content {
    overflow: visible;
  }
  .ac {
    grid-template-columns: minmax(0, 1fr);
    height: calc(100dvh - var(--mobile-topbar-h, 56px) - env(safe-area-inset-top, 0px) - var(--mobile-nav-h, 64px) - env(safe-area-inset-bottom, 0px));
    min-height: 0;
  }
  .ac__rail {
    position: fixed;
    top: 0;
    left: 0;
    bottom: var(--mobile-nav-h, 64px);
    z-index: 60;
    width: min(82vw, 300px);
    max-width: calc(100vw - 16px);
    transform: translateX(-102%);
    transition: transform 220ms ease;
  }
  .ac.rail-open .ac__rail { transform: none; box-shadow: 0 0 40px rgba(0, 0, 0, 0.4); }
  .ac__brand { display: none; }
  .ac__scroll { padding: 18px 12px 4px; }
  .ac__composer-wrap {
    padding: 8px 12px calc(10px + env(safe-area-inset-bottom, 0px));
  }
  .ac__msg.is-user .ac__msg-body { max-width: 88%; }
  .ac__replies { grid-template-columns: minmax(0, 1fr); }
  .ac__multi-btn { max-width: 42%; font-size: 12px; padding: 0 8px; min-width: 0; }
  .ac__composer { min-width: 0; }
  .ac__composer textarea { min-width: 0; }
  .ac__model-menu { max-width: min(280px, calc(100vw - 24px)); }
  .ac__msg-actions { opacity: 1; }
}

/* ============================================================
   EXTRA CREDIT ADD-ON
   ============================================================ */

.addon {
  position: relative;
  padding: 18px 20px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--panel);
  overflow: hidden;
}
.addon::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 3px;
  background: var(--addon-accent, #22c55e);
}
.addon__kicker {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin: 0 0 12px;
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--addon-accent, #22c55e);
}
.addon__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}
.addon__name { font-size: 1.05rem; font-weight: 700; }
.addon__price {
  font-size: 1.7rem;
  font-weight: 800;
  color: var(--addon-accent, #22c55e);
  letter-spacing: -0.02em;
}
.addon__period { font-size: 13px; font-weight: 500; color: var(--muted); }
.addon__manage {
  font-size: 12px;
  color: var(--muted);
  text-decoration: underline;
}

.addon__controls {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
  align-items: center;
  margin-bottom: 14px;
}
.addon__slider {
  position: relative;
  display: flex;
  align-items: center;
  height: 40px;
  padding: 0 6px;
  border-radius: 999px;
  background: var(--panel-2);
  border: 1px solid var(--border);
}
.addon__slider input[type="range"] {
  width: 100%;
  margin: 0;
  accent-color: var(--addon-accent, #22c55e);
  background: transparent;
}
.addon__multiplier {
  position: absolute;
  left: 6px;
  display: grid;
  place-items: center;
  min-width: 44px;
  height: 28px;
  padding: 0 10px;
  border-radius: 999px;
  background: var(--addon-accent, #22c55e);
  color: #04210f;
  font-size: 12.5px;
  font-weight: 700;
  pointer-events: none;
}
.addon__select {
  min-width: 190px;
  height: 40px;
  padding: 0 14px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--text);
  font: inherit;
  font-size: 13px;
}
.addon__cta {
  display: block;
  width: 100%;
  padding: 12px 18px;
  border: 0;
  border-radius: 10px;
  background: var(--text);
  color: var(--bg);
  font: inherit;
  font-size: 13.5px;
  font-weight: 700;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
}
.addon__cta:hover { filter: brightness(0.92); }
.addon__cta.is-locked { opacity: 0.9; }
.addon__foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 12px;
  font-size: 12px;
  color: var(--muted);
}
.addon__foot-check {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--addon-accent, #22c55e);
}
.addon__note {
  margin: 10px 0 0;
  font-size: 12px;
  color: var(--muted);
}

.oa-addon-slot {
  max-width: 1180px;
  margin: 28px auto 0;
}

@media (max-width: 640px) {
  .addon__controls { grid-template-columns: minmax(0, 1fr); }
  .addon__select { min-width: 0; width: 100%; }
}