:root {
  color-scheme: light;
  --surface: rgba(255, 255, 255, 0.84);
  --surface-strong: rgba(255, 255, 255, 0.94);
  --surface-soft: rgba(248, 250, 252, 0.88);
  --border: rgba(148, 163, 184, 0.24);
  --text: #0f172a;
  --muted: #607089;
  --primary: #3b82f6;
  --primary-strong: #2563eb;
  --primary-soft: rgba(59, 130, 246, 0.12);
  --success: #059669;
  --success-soft: rgba(5, 150, 105, 0.12);
  --danger: #dc2626;
  --danger-soft: rgba(220, 38, 38, 0.12);
  --warning: #d97706;
  --warning-soft: rgba(217, 119, 6, 0.12);
  --shadow-soft: 0 12px 28px rgba(15, 23, 42, 0.08);
  --radius-xl: 24px;
  --radius-lg: 18px;
  --radius-md: 16px;
  --radius-sm: 12px;
}

html[data-theme="dark"] {
  color-scheme: dark;
  --surface: rgba(15, 23, 42, 0.82);
  --surface-strong: rgba(15, 23, 42, 0.94);
  --surface-soft: rgba(17, 24, 39, 0.88);
  --border: rgba(148, 163, 184, 0.16);
  --text: #e5eefb;
  --muted: #94a3b8;
  --primary: #60a5fa;
  --primary-strong: #3b82f6;
  --primary-soft: rgba(96, 165, 250, 0.18);
  --success: #34d399;
  --success-soft: rgba(52, 211, 153, 0.16);
  --danger: #f87171;
  --danger-soft: rgba(248, 113, 113, 0.16);
  --warning: #fbbf24;
  --warning-soft: rgba(251, 191, 36, 0.16);
  --shadow-soft: 0 16px 36px rgba(2, 8, 23, 0.28);
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
  background: transparent;
}

body {
  margin: 0;
  font-family:
    "Segoe UI", "PingFang SC", "Microsoft YaHei", -apple-system,
    BlinkMacSystemFont, sans-serif;
  color: var(--text);
  background: transparent;
}

button,
input,
select,
textarea {
  font: inherit;
  color: inherit;
}

button,
select {
  cursor: pointer;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: inherit;
}

.app-shell {
  width: min(1480px, calc(100vw - 12px));
  margin: 6px auto;
}

.layout {
  display: grid;
  grid-template-columns: 344px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
}

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-soft);
  backdrop-filter: blur(18px);
}

.control-panel {
  position: sticky;
  top: 6px;
  padding: 16px;
}

.section + .section {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.section-head h2 {
  margin: 0;
  font-size: 15px;
}

.status-banner {
  position: fixed;
  top: 18px;
  left: 50%;
  z-index: 999;
  width: min(420px, calc(100vw - 24px));
  padding: 12px 16px;
  border-radius: 16px;
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface-strong) 92%, white 8%);
  box-shadow: var(--shadow-soft);
  backdrop-filter: blur(18px);
  font-size: 13px;
  line-height: 1.5;
  transform: translate(-50%, -12px);
  opacity: 0;
  pointer-events: none;
  transition:
    transform 0.2s ease,
    opacity 0.2s ease;
}

.status-banner.is-hidden {
  opacity: 0;
  transform: translate(-50%, -12px);
  pointer-events: none;
}

.status-banner.is-visible {
  opacity: 1;
  transform: translate(-50%, 0);
}

.status-banner.is-success {
  border-color: rgba(5, 150, 105, 0.2);
  background: color-mix(in srgb, var(--surface-strong) 86%, var(--success-soft));
}

.status-banner.is-error {
  border-color: rgba(220, 38, 38, 0.2);
  background: color-mix(in srgb, var(--surface-strong) 86%, var(--danger-soft));
}

.status-banner.is-warning {
  border-color: rgba(217, 119, 6, 0.2);
  background: color-mix(in srgb, var(--surface-strong) 86%, var(--warning-soft));
}

.field {
  display: grid;
  gap: 8px;
}

.field + .field {
  margin-top: 14px;
}

.field > span {
  font-size: 13px;
  font-weight: 700;
  color: var(--muted);
}

.field-grid {
  display: grid;
  gap: 12px;
  margin-top: 14px;
}

.field-grid-params {
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr) 112px;
}

input,
select,
textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface-strong);
  padding: 12px 14px;
  outline: none;
  transition:
    border-color 0.18s ease,
    box-shadow 0.18s ease,
    transform 0.18s ease;
}

input:focus,
select:focus,
textarea:focus {
  border-color: rgba(59, 130, 246, 0.42);
  box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.12);
}

textarea {
  min-height: 118px;
  resize: vertical;
  line-height: 1.65;
}

.muted,
.reference-meta span,
.message-meta {
  color: var(--muted);
}

.inline-metadata {
  display: grid;
  gap: 10px;
  margin-top: 12px;
}

.pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 34px;
  width: fit-content;
  padding: 0 12px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface-soft);
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.pill.is-platform-openai {
  background: rgba(59, 130, 246, 0.12);
  color: var(--primary-strong);
}

.pill.is-platform-gemini,
.pill.is-platform-antigravity {
  background: rgba(16, 185, 129, 0.12);
  color: var(--success);
}

.ghost-button,
.secondary-button,
.primary-button,
.message-action {
  border: none;
  text-decoration: none;
  transition:
    transform 0.18s ease,
    opacity 0.18s ease,
    background 0.18s ease,
    border-color 0.18s ease;
}

.ghost-button,
.secondary-button,
.message-action {
  background: transparent;
}

.ghost-button {
  padding: 0;
  color: var(--primary-strong);
  font-size: 13px;
  font-weight: 700;
}

.ghost-button:hover {
  opacity: 0.82;
}

.upload-drop {
  display: block;
  border: 1px dashed rgba(59, 130, 246, 0.4);
  border-radius: var(--radius-lg);
  background:
    linear-gradient(135deg, rgba(59, 130, 246, 0.08), transparent),
    var(--surface-soft);
  padding: 16px;
}

.upload-copy {
  display: grid;
  gap: 6px;
}

.upload-copy strong {
  font-size: 15px;
}

.upload-copy span {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.5;
}

.reference-card {
  margin-top: 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface-strong);
  min-height: 112px;
  padding: 12px;
  display: grid;
  gap: 10px;
}

.reference-card.is-empty img,
.reference-card.is-empty .reference-meta {
  display: none;
}

.reference-card:not(.is-empty) .reference-empty {
  display: none;
}

.reference-card img {
  width: 100%;
  max-height: 208px;
  object-fit: contain;
  border-radius: 14px;
  background:
    linear-gradient(45deg, rgba(148, 163, 184, 0.08) 25%, transparent 25%),
    linear-gradient(-45deg, rgba(148, 163, 184, 0.08) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, rgba(148, 163, 184, 0.08) 75%),
    linear-gradient(-45deg, transparent 75%, rgba(148, 163, 184, 0.08) 75%);
  background-size: 16px 16px;
  background-position: 0 0, 0 8px, 8px -8px, -8px 0;
}

.reference-meta {
  display: grid;
  gap: 4px;
}

.reference-empty {
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

.chat-panel {
  display: grid;
  grid-template-rows: minmax(0, 1fr) auto;
  min-height: calc(100vh - 12px);
}

.thread {
  overflow: auto;
  padding: 18px;
}

.message-list {
  display: grid;
  gap: 18px;
}

.empty-state {
  min-height: 100%;
  display: grid;
  place-items: center;
  text-align: center;
  padding: 54px 18px;
  gap: 12px;
}

.empty-state.is-hidden {
  display: none;
}

.empty-icon {
  display: grid;
  place-items: center;
  width: 68px;
  height: 68px;
  border-radius: 22px;
  background: var(--primary-soft);
  color: var(--primary-strong);
  margin: 0 auto;
}

.empty-icon svg {
  width: 32px;
  height: 32px;
  fill: currentColor;
}

.empty-state h3 {
  margin: 0;
  font-size: 22px;
  letter-spacing: -0.03em;
}

.empty-state p {
  max-width: 540px;
  margin: 0;
  line-height: 1.7;
  color: var(--muted);
}

.message {
  display: grid;
  gap: 8px;
}

.message.is-user {
  justify-items: end;
}

.message.is-assistant {
  justify-items: start;
}

.message-role {
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.message-card {
  width: min(100%, 920px);
  border-radius: 22px;
  padding: 16px;
  border: 1px solid var(--border);
  background: var(--surface-strong);
  box-shadow: var(--shadow-soft);
}

.message.is-user .message-card {
  background:
    linear-gradient(135deg, rgba(59, 130, 246, 0.12), transparent),
    var(--surface-strong);
}

.message-card.is-pending {
  border-style: dashed;
}

.message-text {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  white-space: pre-wrap;
  color: var(--text);
}

.message-text.is-error {
  color: var(--danger);
}

.message-pending-time {
  margin-top: 10px;
  font-size: 12px;
  font-weight: 700;
  color: var(--muted);
}

.message-meta {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.6;
}

.message-image-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
  margin-top: 14px;
}

.message-image-card {
  border: 1px solid var(--border);
  border-radius: 18px;
  overflow: hidden;
  background: var(--surface-soft);
}

.message-image-card img {
  width: 100%;
  height: 260px;
  object-fit: contain;
  background:
    linear-gradient(45deg, rgba(148, 163, 184, 0.08) 25%, transparent 25%),
    linear-gradient(-45deg, rgba(148, 163, 184, 0.08) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, rgba(148, 163, 184, 0.08) 75%),
    linear-gradient(-45deg, transparent 75%, rgba(148, 163, 184, 0.08) 75%);
  background-size: 18px 18px;
  background-position: 0 0, 0 9px, 9px -9px, -9px 0;
}

.message-image-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding: 12px;
}

.message-action {
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface-strong);
  padding: 8px 12px;
  font-size: 12px;
  font-weight: 700;
}

.message-action:hover,
.secondary-button:hover,
.primary-button:hover {
  transform: translateY(-1px);
}

.message-action.is-primary {
  border-color: transparent;
  background: var(--primary-soft);
  color: var(--primary-strong);
}

.loading-row {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.spinner {
  width: 16px;
  height: 16px;
  border-radius: 999px;
  border: 2px solid rgba(59, 130, 246, 0.18);
  border-top-color: var(--primary);
  animation: spin 0.75s linear infinite;
}

.composer {
  border-top: 1px solid var(--border);
  padding: 16px;
  display: grid;
  gap: 14px;
  background: color-mix(in srgb, var(--surface) 90%, transparent);
}

.composer-actions {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.primary-button,
.secondary-button {
  min-height: 46px;
  padding: 0 18px;
  border-radius: 16px;
  font-size: 14px;
  font-weight: 800;
}

.primary-button {
  background: linear-gradient(135deg, var(--primary), var(--primary-strong));
  color: #ffffff;
  box-shadow: 0 14px 28px rgba(37, 99, 235, 0.22);
}

.secondary-button {
  border: 1px solid var(--border);
  background: var(--surface-strong);
}

.primary-button:disabled,
.secondary-button:disabled,
.message-action:disabled,
input:disabled,
select:disabled,
textarea:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  transform: none;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

@media (max-width: 1180px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .control-panel {
    position: static;
  }

  .chat-panel {
    min-height: 720px;
  }
}

@media (max-width: 860px) {
  .field-grid-params {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .app-shell {
    width: min(100vw - 8px, 100%);
    margin: 4px auto;
  }

  .status-banner {
    top: 10px;
    width: min(420px, calc(100vw - 16px));
  }

  .thread,
  .composer,
  .control-panel {
    padding: 14px;
  }

  .chat-panel {
    min-height: calc(100vh - 8px);
  }

  .message-card {
    width: 100%;
  }

  .message-image-card img {
    height: 220px;
  }
}