/* ═══ Chat Layout ═══ */
.chat-page {
  gap: 1.25rem;
}

.chat-page .page-tab-panel {
  min-width: 0;
  width: 100%;
}

.chat-shell-card {
  width: 100%;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  min-height: 36rem;
  height: min(78vh, 52rem);
  height: min(78dvh, 52rem);
  animation: scaleIn .4s ease both;
}
.chat-shell-card:hover {
  box-shadow: none;
  border-color: var(--border-glass);
}
.chat-shell-card:hover::before {
  opacity: 0;
}

.chat-sidebar-toggle {
  border-radius: var(--radius-sm);
}

.chat-new-btn {
  flex-shrink: 0;
  width: 2rem;
  height: 2rem;
  min-height: unset !important;
  padding: 0 !important;
  border-radius: 50% !important;
  display: flex !important;
  align-items: center;
  justify-content: center;
  font-size: .85rem;
}

.chat-empty-icon-muted {
  font-size: 1.5rem;
  color: var(--text-muted);
  opacity: .3;
}

.chat-empty-title {
  color: var(--text-primary);
}

.chat-sidebar-backdrop {
  position: fixed;
  inset: 0;
  z-index: 1050;
  border: 0;
  padding: 0;
  background: rgba(15, 23, 42, .48);
  backdrop-filter: blur(3px);
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s ease;
}

.chat-sidebar-backdrop.show {
  opacity: 1;
  pointer-events: auto;
}

.chat-send-btn,
.chat-cancel-btn {
  white-space: nowrap;
}

.chat-cancel-btn[hidden] {
  display: none !important;
}

.chat-send-btn.is-loading {
  pointer-events: none;
  opacity: .92;
}

.chat-send-btn.is-loading i {
  animation: chatSpin .8s linear infinite;
}

@keyframes chatSpin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.code-copy-host {
  position: relative;
}

.conv-error-icon {
  font-size: 1.2rem;
  color: var(--warning);
}

.sidebar-header .sidebar-title {
  font-weight: 700;
  font-size: .88rem;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: .4rem;
}
.sidebar-header .sidebar-title i { color: var(--accent); font-size: .9rem; }
#convList {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  padding: .35rem 0;
}
.conv-item .conv-name {
  display: block;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: .15rem;
}
.conv-item .conv-preview {
  display: block;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  font-size: .78rem;
}

/* ═══ Chat Main ═══ */
.chat-header-left { display: flex; align-items: center; gap: .65rem; min-width: 0; flex: 1 1 18rem; }
.chat-header-copy { min-width: 0; display: grid; gap: .28rem; }
.chat-header-title {
  font-size: 1rem;
  font-weight: 700;
  margin: 0;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: .4rem;
}
.chat-header-title i {
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-size: 1.2rem;
}
.chat-header-meta-row {
  display: flex;
  align-items: center;
  gap: .55rem;
  flex-wrap: wrap;
}
.chat-selected-model-badge {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  min-height: 1.9rem;
  padding: 0 .65rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface-alt);
  color: var(--text-primary);
  font-size: .74rem;
  font-weight: 700;
}
.chat-selected-model-badge i {
  color: var(--accent);
}
.chat-header-note {
  color: var(--text-secondary);
  font-size: .74rem;
}
.service-selector .form-select {
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: var(--surface-alt);
  color: var(--text-primary);
  font-size: .85rem;
  font-weight: 500;
  min-width: 200px;
  padding: .45rem .8rem;
  transition: border-color .2s, box-shadow .2s, background .35s;
}
.service-selector .form-select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-light);
  background: var(--surface);
}

.chat-service-details {
  display: flex;
  flex-wrap: wrap;
  gap: .55rem;
  padding: .72rem 1rem;
  border-bottom: 1px solid var(--border);
  background:
    linear-gradient(180deg, rgba(255,255,255,.04), transparent),
    color-mix(in srgb, var(--surface-alt) 76%, transparent);
}

.chat-service-detail {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  min-height: 2rem;
  padding: .35rem .7rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface) 94%, transparent);
  color: var(--text-secondary);
  font-size: .74rem;
  font-weight: 600;
}

.chat-service-detail i {
  color: var(--accent);
}

/* ═══ Messages ═══ */
.msg {
  max-width: min(78%, 760px);
  margin-bottom: .85rem;
  animation: msgAppear .35s ease both;
}
@keyframes msgAppear {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}
.msg-user { margin-left: auto; }
.msg-ai { margin-right: auto; }
.msg-system {
  max-width: min(88%, 760px);
  margin-inline: auto;
}
.msg-bubble {
  padding: .8rem 1rem;
  border-radius: 1.1rem;
  font-size: .9rem;
  line-height: 1.6;
  word-wrap: break-word;
  transition: background .25s ease;
  position: relative;
}
.msg-ai .msg-bubble pre {
  background: var(--code-bg);
  color: var(--code-text);
  padding: .85rem 1rem;
  border-radius: var(--radius-md);
  overflow-x: auto;
  font-size: .82rem;
  margin: .6rem 0;
  border: 1px solid var(--border);
  position: relative;
}
.msg-ai .msg-bubble code {
  font-size: .82rem;
  background: var(--code-bg);
  color: var(--code-text);
  padding: .15rem .4rem;
  border-radius: .3rem;
}
.msg-ai .msg-bubble pre code {
  background: transparent;
  padding: 0;
}
.msg-meta {
  font-size: .72rem;
  color: var(--text-muted);
  margin-top: .3rem;
  padding: 0 .5rem;
  display: flex;
  align-items: center;
  gap: .3rem;
}

.msg-system .msg-bubble {
  background: color-mix(in srgb, var(--surface-alt) 90%, transparent);
  border: 1px dashed var(--border);
  color: var(--text-secondary);
}

.msg-system.msg-error .msg-bubble,
.msg-bubble-error {
  background: color-mix(in srgb, var(--danger) 10%, var(--surface));
  border: 1px solid color-mix(in srgb, var(--danger) 30%, var(--border));
  color: var(--text-primary);
}

/* ═══ Typing Indicator ═══ */
.typing-indicator .msg-bubble {
  display: flex;
  gap: 5px;
  padding: .85rem 1.3rem;
  background: var(--surface);
  border: 1px solid var(--border);
}
.chat-layout .msg-ai .msg-bubble {
  position: relative;
}
.chat-layout .msg-ai .msg-bubble::before {
  content: '';
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(135deg, rgba(var(--accent-rgb), .3), rgba(var(--accent-rgb), .05));
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
  opacity: 0;
  transition: opacity .3s;
}
.chat-layout .msg-ai:hover .msg-bubble::before {
  opacity: 1;
}
.chat-layout .typing-dot {
  width: 7px; height: 7px;
  background: var(--accent);
  border-radius: 50%;
  animation: typingBounce .8s cubic-bezier(.36, .07, .19, .97) infinite;
  opacity: .4;
}
.chat-layout .typing-dot:nth-child(2) { animation-delay: .16s; }
.chat-layout .typing-dot:nth-child(3) { animation-delay: .32s; }
@keyframes typingBounce {
  0%, 80%, 100% { transform: translateY(0) scale(1); opacity: .4; }
  40% { transform: translateY(-6px) scale(1.15); opacity: 1; }
}

/* ═══ Chat Input ═══ */
.chat-input-meta kbd {
  display: inline-flex;
  align-items: center;
  padding: .05rem .35rem;
  font-size: .72rem;
  font-family: inherit;
  font-weight: 700;
  border: 1px solid var(--border);
  border-radius: .3rem;
  background: var(--surface-alt);
  color: var(--text-secondary);
  line-height: 1.4;
}

#chatInput::placeholder { color: var(--text-muted); }
#chatInput:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-light);
  background: var(--surface);
}
#sendBtn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-accent);
}

/* ═══ Empty State ═══ */
.chat-empty-state .empty-icon {
  position: relative;
  width: 80px; height: 80px;
  border-radius: 50%;
  background: var(--gradient-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
}
.chat-empty-state .empty-icon::before,
.chat-empty-state .empty-icon::after {
  content: '';
  position: absolute;
  border-radius: 50%;
  background: var(--gradient);
  opacity: .1;
  animation: emptyOrbit 4s ease-in-out infinite;
}
.chat-empty-state .empty-icon::before {
  width: 14px; height: 14px;
  top: -4px; right: -4px;
}
.chat-empty-state .empty-icon::after {
  width: 8px; height: 8px;
  bottom: 2px; left: -6px;
  animation-delay: -2s;
  animation-direction: reverse;
}
@keyframes emptyOrbit {
  0%, 100% { transform: translate(0, 0) scale(1); }
  25% { transform: translate(4px, -4px) scale(1.2); }
  50% { transform: translate(0, -2px) scale(.9); }
  75% { transform: translate(-4px, 2px) scale(1.1); }
}
.chat-empty-state .empty-icon i {
  font-size: 2rem;
  color: var(--accent);
  opacity: .5;
}

.chat-starter-prompts {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: .6rem;
  margin-top: 1rem;
  max-width: 40rem;
}

.chat-starter-chip {
  min-height: 2.4rem;
  padding: 0 .85rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface-alt); /* color-mix fallback */
  background: color-mix(in srgb, var(--surface-alt) 94%, transparent);
  color: var(--text-secondary);
  font-size: .78rem;
  font-weight: 700;
  transition: background .2s ease, color .2s ease, border-color .2s ease, transform .2s ease;
}

.chat-starter-chip:hover {
  color: var(--text-primary);
  background: var(--surface); /* color-mix fallback */
  background: color-mix(in srgb, var(--surface) 96%, transparent);
  border-color: color-mix(in srgb, var(--accent) 28%, var(--border));
  transform: translateY(-1px);
  box-shadow: 0 2px 8px rgba(var(--accent-rgb), .1);
}

.chat-starter-chip:active {
  transform: scale(.96);
}

/* ═══ Code Copy Button ═══ */
.code-copy-btn {
  position: absolute;
  top: .4rem;
  right: .4rem;
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(255,255,255,.15);
  color: var(--code-text);
  border-radius: var(--radius-sm);
  padding: .2rem .5rem;
  font-size: .68rem;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s, background .15s;
}
.msg-ai .msg-bubble pre:hover .code-copy-btn,
.msg-ai .msg-bubble pre:focus-within .code-copy-btn {
  opacity: 1;
  pointer-events: auto;
}
.code-copy-btn:hover { background: rgba(255,255,255,.15); }

/* ═══ Current Chat Layer ═══ */
.chat-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  padding: .95rem 1rem;
  background: var(--surface);
  background: color-mix(in srgb, var(--surface) 97%, transparent);
  border-bottom: 1px solid var(--border);
}

.chat-header-right {
  display: flex;
  align-items: center;
  gap: .65rem;
  margin-left: auto;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.chat-layout {
  display: flex;
  flex: 1 1 auto;
  min-height: 0;
  position: relative;
}

.chat-stage-bar {
  display: flex;
  flex-wrap: wrap;
  gap: .55rem;
  padding: .72rem .95rem 0;
}

.chat-stage-bar span {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  min-height: 1.9rem;
  padding: 0 .68rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface-alt) 92%, transparent);
  color: var(--text-secondary);
  font-size: .72rem;
  font-weight: 700;
}

.chat-stage-bar i {
  color: var(--accent);
}

.chat-sidebar {
  width: 290px;
  flex-shrink: 0;
  min-height: 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--surface-alt);
  background: color-mix(in srgb, var(--surface-alt) 98%, transparent);
  border-right: 1px solid var(--border);
  position: relative;
}

.chat-sidebar::after {
  content: '';
  position: absolute;
  inset: 0 auto 0 0;
  width: 1px;
  background: linear-gradient(180deg, rgba(var(--accent-rgb), .16), transparent 20%, transparent 80%, rgba(var(--accent-rgb), .1));
  pointer-events: none;
}

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .5rem;
  padding: .85rem 1rem;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.conv-item {
  position: relative;
  margin: .2rem .45rem;
  border: 1px solid var(--border);
  border-radius: .75rem;
  background: var(--surface);
  box-shadow: var(--shadow-xs);
  transition: background .15s, border-color .15s, box-shadow .15s;
}

.conv-item:hover {
  background: var(--surface-hover);
  border-color: color-mix(in srgb, var(--accent) 18%, var(--border));
  box-shadow: var(--shadow-sm);
}

.conv-open-btn {
  width: 100%;
  display: block;
  border: 0;
  background: transparent;
  color: inherit;
  text-align: left;
  border-radius: inherit;
  padding: .55rem 2.4rem .55rem .8rem;
}

.conv-delete-btn {
  position: absolute;
  top: 50%;
  right: .4rem;
  transform: translateY(-50%);
  width: 1.7rem;
  height: 1.7rem;
  border-radius: 50%;
  border: 0;
  background: transparent;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: .78rem;
  padding: 0;
  cursor: pointer;
  opacity: 0;
  transition: opacity .15s, background .15s, color .15s;
}

.conv-delete-btn:hover {
  background: color-mix(in srgb, var(--danger) 10%, var(--surface));
  color: var(--danger);
}

.conv-item:hover .conv-delete-btn,
.conv-item:focus-within .conv-delete-btn {
  opacity: 1;
}

.conv-item.active {
  background: color-mix(in srgb, var(--accent) 8%, var(--surface));
  border-color: color-mix(in srgb, var(--accent) 22%, var(--border));
  box-shadow: var(--shadow-sm);
}

.conv-item.active .conv-name {
  color: var(--accent);
}

.chat-main {
  flex: 1;
  min-width: 0;
  min-height: 0;
  display: flex;
  flex-direction: column;
  background:
    radial-gradient(circle at top right, rgba(var(--accent-rgb), .06), transparent 26%),
    color-mix(in srgb, var(--surface) 30%, transparent);
}

.chat-messages {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  padding: .95rem;
}

.msg-user .msg-bubble {
  box-shadow: var(--shadow-accent);
  border: 1px solid rgba(var(--accent-rgb), .08);
  background: linear-gradient(135deg, rgba(var(--accent-rgb), .98), color-mix(in srgb, var(--accent) 84%, #ffffff 16%));
  color: #fff;
}

.msg-ai .msg-bubble {
  background:
    linear-gradient(180deg, rgba(255,255,255,.04), transparent 24%),
    color-mix(in srgb, var(--surface) 97%, transparent);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-xs);
}

.chat-input-area {
  padding: .72rem .85rem .85rem;
  background:
    linear-gradient(180deg, transparent, rgba(255,255,255,.04)),
    color-mix(in srgb, var(--surface) 98%, transparent);
  border-top: 1px solid var(--border);
}

.chat-input-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .75rem;
  margin-bottom: .5rem;
  color: var(--text-secondary);
  font-size: .8rem;
}

.chat-input-meta span {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
}

#chatInput {
  min-height: 52px;
  padding: .82rem .95rem;
  border-radius: 1rem;
  box-shadow: inset 0 1px 0 rgba(255,255,255,.08);
}

#cancelBtn,
#sendBtn {
  min-height: unset;
  height: auto;
  padding: .5rem 1.1rem;
  border-radius: var(--radius-md);
  font-size: .9rem;
}

.chat-input-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: .75rem;
  margin-top: .55rem;
  color: var(--text-secondary);
  font-size: .8rem;
}

.chat-input-counter {
  font-variant-numeric: tabular-nums;
}

.chat-input-counter.is-limit-near {
  color: var(--warning);
}

.chat-input-status {
  text-align: right;
}

.chat-cost-estimate {
  font-variant-numeric: tabular-nums;
}

.chat-cost-estimate.is-warning {
  color: var(--warning);
}

.chat-empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: .5rem;
  max-width: 36rem;
  margin: auto;
  padding: 1rem 0;
}

.chat-empty-state-loading .empty-icon i,
.chat-empty-state-error .empty-icon i {
  opacity: .9;
}

.chat-empty-state-loading .empty-icon i {
  animation: chatSpin 1.1s linear infinite;
}

.chat-empty-state-error .empty-icon {
  background: color-mix(in srgb, var(--danger) 10%, transparent);
}

.chat-empty-state-error .empty-icon i {
  color: var(--danger);
}

.chat-layout .msg-actions {
  display: flex;
  gap: .25rem;
  margin-top: .35rem;
  padding: 0 .5rem;
  opacity: .82;
  transition: opacity .2s;
}

.chat-layout .msg:hover .msg-actions {
  opacity: 1;
}

.chat-layout .msg-action-btn {
  background: var(--surface);
  background: color-mix(in srgb, var(--surface) 96%, transparent);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: .2rem .45rem;
  font-size: .68rem;
  color: var(--text-muted);
  cursor: pointer;
  transition: all .15s;
  display: inline-flex;
  align-items: center;
  gap: .2rem;
}

.chat-layout .msg-action-btn:hover {
  background: var(--surface-hover);
  color: var(--text-primary);
  border-color: var(--accent);
}

.chat-send-btn:disabled,
.chat-cancel-btn:disabled,
.chat-layout .msg-action-btn:disabled {
  transform: none !important;
  box-shadow: none !important;
  opacity: .65;
  cursor: not-allowed;
}

.chat-sidebar-toggle:focus-visible,
.chat-new-btn:focus-visible,
.chat-starter-chip:focus-visible,
.conv-open-btn:focus-visible,
.conv-delete-btn:focus-visible,
.chat-layout .msg-action-btn:focus-visible,
.code-copy-btn:focus-visible,
#cancelBtn:focus-visible,
#sendBtn:focus-visible,
#chatInput:focus-visible,
.service-selector .form-select:focus-visible {
  outline: 0;
  box-shadow: 0 0 0 3px var(--accent-light);
}

.conv-open-btn:focus-visible {
  background: color-mix(in srgb, var(--accent) 5%, var(--surface));
  box-shadow: 0 0 0 2px var(--accent);
}

.conv-item:focus-within {
  border-color: color-mix(in srgb, var(--accent) 18%, var(--border));
}

.conv-delete-btn:focus-visible {
  background: color-mix(in srgb, var(--accent) 12%, var(--surface));
  color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent);
  opacity: 1;
}

body.chat-sidebar-open {
  overflow: hidden;
}

@media (max-width: 768px) {
  .chat-page {
    gap: 1rem;
    padding-bottom: calc(5rem + env(safe-area-inset-bottom, 0px));
  }

  .chat-shell-card {
    min-height: 0;
    height: calc(100vh - 7.5rem);
    height: calc(100dvh - 7.5rem);
    max-height: calc(100vh - 7.5rem);
    max-height: calc(100dvh - 7.5rem);
  }

  .chat-header {
    padding: .82rem .85rem;
  }

  .chat-header-right {
    width: 100%;
  }

  .chat-selected-model-badge {
    width: 100%;
    justify-content: center;
  }

  .chat-header-note {
    display: none;
  }

  .chat-service-details {
    padding: .72rem .85rem;
  }

  .chat-stage-bar {
    padding: .72rem .85rem 0;
  }

  .service-selector {
    width: 100%;
  }

  .service-selector .form-select {
    width: 100%;
    min-width: 0;
  }

  .chat-layout {
    min-height: 0;
  }

  .chat-sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 1060;
    width: min(92vw, 360px);
    max-width: 360px;
    height: 100vh;
    height: 100dvh;
    overflow-y: auto;
    padding-top: calc(.75rem + env(safe-area-inset-top, 0px));
    padding-bottom: calc(.75rem + env(safe-area-inset-bottom, 0px));
    border-right: none;
    transform: translateX(calc(-100% - 1rem));
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: transform .25s ease, opacity .2s ease, visibility .2s ease;
  }

  .chat-sidebar.show {
    border-right: 1px solid var(--border);
    box-shadow: var(--shadow-lg);
    transform: translateX(0);
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  .chat-input-meta {
    flex-direction: column;
    align-items: start;
  }

  .chat-input-footer {
    flex-direction: column;
    align-items: flex-start;
  }

  .chat-cost-estimate,
  .chat-input-status {
    text-align: left;
  }

  .chat-starter-prompts {
    justify-content: flex-start;
  }

  .chat-messages {
    padding: .85rem;
  }

  .msg {
    max-width: 92%;
  }

  .msg-system {
    max-width: 100%;
  }

  .code-copy-btn {
    opacity: 1;
    pointer-events: auto;
  }
}

@media (hover: none) {
  .conv-item:active .conv-delete-btn {
    opacity: 1;
    background: color-mix(in srgb, var(--danger) 10%, var(--surface));
    color: var(--danger);
  }
}

@media (prefers-reduced-motion: reduce) {
  .chat-shell-card,
  .msg,
  .chat-send-btn,
  .chat-starter-chip,
  .code-copy-btn,
  .typing-dot,
  .chat-empty-state .empty-icon::before,
  .chat-empty-state .empty-icon::after,
  .chat-empty-state-loading .empty-icon i {
    animation: none !important;
    transition: none !important;
  }

  #sendBtn:hover,
  .chat-starter-chip:hover {
    transform: none;
  }
}