:root {
  color-scheme: light;
  --surface: rgba(255, 255, 255, 0.78);
  --surface-strong: rgba(255, 255, 255, 0.92);
  --surface-soft: rgba(245, 247, 250, 0.9);
  --surface-contrast: rgba(240, 243, 247, 0.94);
  --border: rgba(15, 23, 42, 0.08);
  --border-strong: rgba(15, 23, 42, 0.12);
  --text: #111827;
  --muted: #667085;
  --primary: #4c6fff;
  --primary-strong: #3f5ee8;
  --primary-soft: rgba(76, 111, 255, 0.1);
  --accent: #0f172a;
  --accent-soft: rgba(15, 23, 42, 0.06);
  --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 10px 24px rgba(15, 23, 42, 0.04);
  --shadow-card: 0 2px 8px rgba(15, 23, 42, 0.03);
  --radius-xl: 18px;
  --radius-lg: 14px;
  --radius-md: 12px;
  --radius-sm: 10px;
}

html[data-theme="dark"] {
  color-scheme: dark;
  --surface: rgba(15, 16, 19, 0.84);
  --surface-strong: rgba(18, 19, 23, 0.94);
  --surface-soft: rgba(21, 24, 30, 0.9);
  --surface-contrast: rgba(25, 28, 35, 0.96);
  --border: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.12);
  --text: #f3f4f6;
  --muted: #9ca3af;
  --primary: #7b92ff;
  --primary-strong: #92a6ff;
  --primary-soft: rgba(123, 146, 255, 0.18);
  --accent: #e5e7eb;
  --accent-soft: rgba(255, 255, 255, 0.08);
  --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 18px 40px rgba(2, 6, 23, 0.34);
  --shadow-card: 0 4px 14px rgba(2, 6, 23, 0.28);
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  font-family:
    "SF Pro Display", "SF Pro Text", "Avenir Next", "Helvetica Neue", "PingFang SC",
    "Microsoft YaHei", -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--text);
  background:
    linear-gradient(180deg, rgba(249, 250, 251, 0.98), rgba(244, 246, 248, 0.98)),
    linear-gradient(90deg, rgba(15, 23, 42, 0.02) 1px, transparent 1px),
    linear-gradient(rgba(15, 23, 42, 0.02) 1px, transparent 1px);
  background-size: auto, 24px 24px, 24px 24px;
}

html[data-theme="dark"] body {
  background:
    linear-gradient(180deg, rgba(10, 11, 14, 0.98), rgba(14, 16, 20, 0.98)),
    linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: auto, 24px 24px, 24px 24px;
}

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(1380px, calc(100vw - 24px));
  margin: 16px auto 20px;
  display: grid;
  gap: 12px;
}

.layout {
  display: grid;
  grid-template-columns: 320px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
}

.promo-banner {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 11px 14px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: color-mix(in srgb, var(--surface) 92%, var(--surface-soft));
  color: var(--text);
  text-decoration: none;
  box-shadow: none;
}

.promo-banner:hover {
  border-color: var(--border-strong);
  background: color-mix(in srgb, var(--surface) 94%, var(--surface-soft));
}

.promo-label {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 64px;
  min-height: 26px;
  padding: 0 9px;
  border-radius: 8px;
  background: var(--surface-contrast);
  color: var(--muted);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border: 1px solid var(--border);
}

.promo-copy {
  flex: 1;
  min-width: 0;
  font-size: 13px;
  line-height: 1.5;
  color: var(--muted);
}

.promo-link {
  font-size: 12px;
  font-weight: 800;
  color: var(--primary-strong);
  white-space: nowrap;
}

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-soft);
  backdrop-filter: blur(12px);
}

.app-header {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 18px;
  padding: 18px 20px;
}

.app-header-copy {
  display: grid;
  gap: 12px;
  max-width: 860px;
}

.app-eyebrow,
.app-chip,
.toolbar-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 32px;
  padding: 0 12px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.app-eyebrow {
  width: fit-content;
  background: var(--surface-contrast);
  color: var(--accent);
}

.app-header h1 {
  margin: 0;
  font-size: clamp(28px, 4vw, 40px);
  line-height: 1.02;
  letter-spacing: -0.05em;
}

.app-header h1 span {
  color: var(--primary-strong);
}

.app-slogan {
  margin: -2px 0 0;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--primary-strong);
}

.app-description {
  margin: 0;
  font-size: 14px;
  line-height: 1.65;
  color: var(--muted);
}

.app-header-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  justify-content: flex-end;
}

.app-chip {
  background: var(--surface-contrast);
  border: 1px solid var(--border);
  color: var(--muted);
}

.app-chip.is-accent {
  background: var(--primary-soft);
  color: var(--primary-strong);
  border-color: transparent;
}

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

.section + .section {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--border);
}

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

.section-head > div {
  display: grid;
  gap: 4px;
}

.section-note {
  margin: 0;
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.section-head h2 {
  margin: 0;
  font-size: 16px;
  letter-spacing: -0.02em;
}

.status-banner {
  position: fixed;
  top: 18px;
  left: 50%;
  z-index: 999;
  width: min(420px, calc(100vw - 24px));
  padding: 12px 16px;
  border-radius: 12px;
  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: 7px;
}

.field + .field {
  margin-top: 12px;
}

.field > span {
  font-size: 12px;
  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-contrast);
  padding: 11px 13px;
  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: color-mix(in srgb, var(--primary) 45%, var(--border-strong));
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary-soft) 85%, transparent);
}

textarea {
  min-height: 128px;
  resize: vertical;
  line-height: 1.65;
}

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

.inline-metadata {
  display: grid;
  gap: 8px;
  margin-top: 10px;
}

.pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 30px;
  width: fit-content;
  padding: 0 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface-contrast);
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
}

.pill.is-platform-openai {
  background: var(--primary-soft);
  color: var(--primary-strong);
}

.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: 12px;
  font-weight: 700;
}

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

.upload-drop {
  display: block;
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius-lg);
  background: var(--surface-soft);
  padding: 14px;
}

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

.upload-copy strong {
  font-size: 14px;
}

.upload-copy span {
  font-size: 12px;
  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-list {
  margin-top: 10px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: 8px;
}

.reference-list.is-empty {
  display: block;
  border: 1px dashed var(--border);
  border-radius: var(--radius-lg);
  padding: 14px;
  background: var(--surface-soft);
}

.reference-item {
  position: relative;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface-strong);
  overflow: hidden;
  display: grid;
  grid-template-rows: auto auto;
}

.reference-item img {
  width: 100%;
  height: 88px;
  object-fit: cover;
}

.reference-item-meta {
  display: grid;
  gap: 2px;
  padding: 6px 8px 8px;
  font-size: 11px;
  line-height: 1.3;
}

.reference-item-meta strong {
  font-size: 12px;
  font-weight: 700;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

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

.reference-item-remove {
  position: absolute;
  top: 4px;
  right: 4px;
  width: 20px;
  height: 20px;
  border-radius: 999px;
  border: none;
  background: rgba(15, 23, 42, 0.62);
  color: #fff;
  font-size: 14px;
  line-height: 1;
  display: grid;
  place-items: center;
  cursor: pointer;
}

.reference-item-remove:hover {
  background: rgba(15, 23, 42, 0.82);
}

.mode-tabs {
  display: inline-flex;
  gap: 4px;
  padding: 3px;
  margin-bottom: 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface-contrast);
}

.mode-tab {
  border: none;
  background: transparent;
  padding: 7px 12px;
  border-radius: 8px;
  font-size: 12px;
  font-weight: 700;
  color: var(--muted);
}

.mode-tab.is-active {
  background: var(--surface-strong);
  color: var(--primary-strong);
  box-shadow: inset 0 0 0 1px var(--border);
}

.mode-panel.is-hidden {
  display: none;
}

.manual-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 10px;
  flex-wrap: wrap;
}

.secondary-button.is-compact {
  min-height: 34px;
  padding: 0 12px;
  font-size: 12px;
  border-radius: 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: auto minmax(0, 1fr) auto;
  min-height: calc(100vh - 12px);
  overflow: hidden;
}

.chat-toolbar {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
  align-items: center;
  padding: 16px 18px;
  border-bottom: 1px solid var(--border);
  background: var(--surface-contrast);
}

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

.chat-toolbar h2 {
  margin: 0;
  font-size: 20px;
  letter-spacing: -0.03em;
}

.chat-toolbar-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.toolbar-pill {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--muted);
}

.thread {
  overflow: auto;
  padding: 16px 18px;
}

.message-list {
  display: grid;
  gap: 14px;
}

.empty-state {
  min-height: 100%;
  display: grid;
  place-items: center;
  text-align: center;
  padding: 48px 18px;
  gap: 10px;
}

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

.empty-icon {
  display: grid;
  place-items: center;
  width: 56px;
  height: 56px;
  border-radius: 16px;
  background: var(--surface-contrast);
  color: var(--primary-strong);
  margin: 0 auto;
  border: 1px solid var(--border);
}

.empty-icon svg {
  width: 24px;
  height: 24px;
  fill: currentColor;
}

.empty-state h3 {
  margin: 0;
  font-size: 20px;
  letter-spacing: -0.02em;
}

.empty-state p {
  max-width: 540px;
  margin: 0;
  line-height: 1.65;
  color: var(--muted);
  font-size: 14px;
}

.message {
  display: grid;
  gap: 6px;
}

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

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

.message-role {
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.message-card {
  width: min(100%, 920px);
  border-radius: 14px;
  padding: 14px;
  border: 1px solid var(--border);
  background: var(--surface-strong);
  box-shadow: var(--shadow-card);
}

.message.is-user .message-card {
  background: color-mix(in srgb, var(--primary-soft) 28%, var(--surface-strong));
}

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

.message-text {
  margin: 0;
  font-size: 13px;
  line-height: 1.65;
  white-space: pre-wrap;
  color: var(--text);
}

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

.message-pending-time {
  margin-top: 10px;
  font-size: 11px;
  font-weight: 700;
  color: var(--muted);
}

.message-meta {
  margin-top: 10px;
  font-size: 11px;
  line-height: 1.6;
}

.message-image-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
  margin-top: 12px;
}

.message-image-card {
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  background: var(--surface-soft);
}

.message-image-card img {
  width: 100%;
  height: 240px;
  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: 8px;
  padding: 10px;
}

.message-action {
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--surface-strong);
  padding: 8px 10px;
  font-size: 11px;
  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: 8px;
}

.spinner {
  width: 14px;
  height: 14px;
  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: 14px 16px 16px;
  display: grid;
  gap: 12px;
  background: color-mix(in srgb, var(--surface) 92%, transparent);
}

.composer-hint {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.5;
}

.composer-hint span {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  padding: 0 9px;
  border-radius: 8px;
  background: var(--surface-contrast);
  border: 1px solid var(--border);
}

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

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.primary-button,
.secondary-button {
  min-height: 40px;
  padding: 0 16px;
  border-radius: 10px;
  font-size: 13px;
  font-weight: 800;
}

.primary-button {
  background: linear-gradient(180deg, var(--primary), var(--primary-strong));
  color: #ffffff;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.16);
}

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

.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,
  .chat-toolbar,
  .app-header {
    padding: 14px;
  }

  .promo-banner {
    flex-wrap: wrap;
    align-items: flex-start;
    padding: 14px;
  }

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

  .app-header {
    align-items: start;
  }

  .message-card {
    width: 100%;
  }

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

  .app-header h1 {
    font-size: 28px;
  }

  .app-header-meta,
  .chat-toolbar-meta {
    justify-content: flex-start;
  }
}