/* =========================================================================
   Theme tokens — default is LIGHT (LangChain brand palette).
   [data-theme="dark"] overrides below flip to the dark palette.
   ========================================================================= */
:root,
[data-theme="light"] {
  /* Surfaces */
  --bg: #F5F5F7;
  --surface: #EAEAEE;
  --surface-2: #E0E1E6;
  --panel: #E0E1E6;

  /* Borders / dividers */
  --border: #C8CAD0;
  --border-strong: #A0A4B0;
  --header-bg: rgba(245, 245, 247, 0.85);
  --header-shadow: 0 4px 24px rgba(36, 40, 59, 0.06);
  --files-panel-bg: rgba(234, 234, 238, 0.6);
  --files-panel-header-bg: rgba(245, 245, 247, 0.96);
  --preview-panel-bg: rgba(255, 255, 255, 0.92);
  --preview-header-bg: rgba(245, 245, 247, 0.98);
  --preview-header-shadow: 0 2px 12px rgba(36, 40, 59, 0.06);
  --code-bg: rgba(36, 40, 59, 0.06);
  --code-block-bg: rgba(36, 40, 59, 0.05);
  --code-block-border: rgba(36, 40, 59, 0.12);
  --table-th-bg: rgba(36, 40, 59, 0.06);
  --shadow-color: rgba(36, 40, 59, 0.18);
  --modal-shadow-color: rgba(36, 40, 59, 0.22);
  --backdrop-bg: rgba(36, 40, 59, 0.45);
  --image-backdrop-bg: rgba(36, 40, 59, 0.55);
  --image-modal-header-bg: rgba(245, 245, 247, 0.92);
  --chat-render-border: rgba(36, 40, 59, 0.12);
  --chat-render-bg: #fff;
  --hover-overlay: rgba(36, 40, 59, 0.04);
  --footer-top-border: rgba(36, 40, 59, 0.1);
  --delete-bg: rgba(190, 24, 93, 0.08);
  --delete-bg-hover: rgba(190, 24, 93, 0.22);
  --delete-border: rgba(190, 24, 93, 0.4);
  --delete-border-hover: #BE185D;
  --delete-color: #BE185D;
  --delete-color-hover: #fff;
  --thinking-bg: rgba(180, 83, 9, 0.06);
  --thinking-border: rgba(180, 83, 9, 0.4);
  --dot-grid-color: rgba(46, 94, 170, 0.05);
  --tool-step-bg: rgba(36, 40, 59, 0.04);
  --tool-call-bg: rgba(46, 94, 170, 0.06);
  --tool-call-border: rgba(46, 94, 170, 0.28);
  --tool-call-border-strong: rgba(46, 94, 170, 0.5);
  --tool-call-substeps-border: rgba(46, 94, 170, 0.22);
  --composer-gradient-start: rgba(245, 245, 247, 0.95);
  --composer-gradient-end: rgba(245, 245, 247, 0);

  /* Text */
  --text: #24283B;
  --text-muted: #6B7280;
  --text-soft: #4B5563;
  --logo-bg: #fff;

  /* Brand accents */
  --accent: #2E5EAA;
  --accent-dim: #1E4A8A;
  --accent-soft: rgba(46, 94, 170, 0.12);
  --accent-strong-bg: linear-gradient(180deg, #3B6FBE, #1E4A8A);

  /* Status */
  --user-bubble: #DCE7F5;
  --agent-bubble: #FFFFFF;
  --success: #3A7D0A;
  --warning: #B45309;
  --stop-btn: #BE185D;
  --stop-btn-hover: #9F1239;

  /* Stage dots */
  --stage-planning: #2E5EAA;
  --stage-reasoning: #7C3AED;
  --stage-tool-waiting: #B45309;
  --stage-composing: #3A7D0A;
  --stage-streaming: #0F766E;

  /* Layout tokens */
  --radius: 12px;
  --font: "Segoe UI", system-ui, -apple-system, sans-serif;
  --mono: "JetBrains Mono", "Fira Code", ui-monospace, monospace;
}

[data-theme="dark"] {
  --bg: #11121D;
  --surface: #1A1B2E;
  --surface-2: #25283B;
  --panel: #25283B;

  --border: #25283B;
  --border-strong: #3A3E57;
  --header-bg: rgba(26, 27, 46, 0.92);
  --header-shadow: 0 4px 24px rgba(0, 0, 0, 0.28);
  --files-panel-bg: rgba(26, 27, 46, 0.55);
  --files-panel-header-bg: rgba(17, 18, 29, 0.96);
  --preview-panel-bg: rgba(15, 20, 28, 0.92);
  --preview-header-bg: rgba(15, 20, 28, 0.98);
  --preview-header-shadow: 0 2px 12px rgba(0, 0, 0, 0.22);
  --code-bg: rgba(0, 0, 0, 0.25);
  --code-block-bg: rgba(0, 0, 0, 0.35);
  --code-block-border: var(--border);
  --table-th-bg: rgba(0, 0, 0, 0.2);
  --shadow-color: rgba(0, 0, 0, 0.45);
  --modal-shadow-color: rgba(0, 0, 0, 0.45);
  --backdrop-bg: rgba(8, 12, 18, 0.72);
  --image-backdrop-bg: rgba(6, 9, 14, 0.9);
  --image-modal-header-bg: rgba(20, 28, 40, 0.85);
  --chat-render-border: rgba(255, 255, 255, 0.1);
  --chat-render-bg: #000;
  --hover-overlay: rgba(255, 255, 255, 0.03);
  --footer-top-border: var(--border);
  --delete-bg: rgba(120, 30, 30, 0.25);
  --delete-bg-hover: rgba(160, 40, 40, 0.45);
  --delete-border: rgba(220, 80, 80, 0.45);
  --delete-border-hover: #e06060;
  --delete-color: #f0a0a0;
  --delete-color-hover: #fff;
  --thinking-bg: rgba(0, 0, 0, 0.15);
  --thinking-border: rgba(251, 191, 36, 0.3);
  --dot-grid-color: rgba(61, 154, 237, 0.03);
  --tool-step-bg: rgba(0, 0, 0, 0.18);
  --tool-call-bg: rgba(61, 154, 237, 0.04);
  --tool-call-border: rgba(61, 154, 237, 0.35);
  --tool-call-border-strong: rgba(61, 154, 237, 0.55);
  --tool-call-substeps-border: rgba(61, 154, 237, 0.25);
  --composer-gradient-start: rgba(17, 18, 29, 0.95);
  --composer-gradient-end: rgba(17, 18, 29, 0);

  --text: #C0CAF5;
  --text-muted: #545C7E;
  --text-soft: #8b9cb3;
  --logo-bg: #fff;

  --accent: #7AA2F7;
  --accent-dim: #2563a8;
  --accent-soft: rgba(122, 162, 247, 0.16);
  --accent-strong-bg: linear-gradient(180deg, var(--accent-dim), #1d4f8c);

  --user-bubble: #1e3a5f;
  --agent-bubble: #1e2a3a;
  --success: #34d399;
  --warning: #fbbf24;
  --stop-btn: #c24141;
  --stop-btn-hover: #9f3030;

  --stage-planning: #7aa2f7;
  --stage-reasoning: #bb9af7;
  --stage-tool-waiting: #e0af68;
  --stage-composing: #9ece6a;
  --stage-streaming: #73daca;
}

/* =========================================================================
   Override github-dark syntax highlighting for the LIGHT theme.
   (github-dark.min.css is the only syntax theme shipped; in light mode
   we recolor each token class to its GitHub-Light equivalent.)
   ========================================================================= */
[data-theme="light"] .hljs,
[data-theme="light"] pre code.hljs {
  color: #24292e !important;
  background: #ffffff !important;
}
[data-theme="light"] .hljs-comment,
[data-theme="light"] .hljs-code,
[data-theme="light"] .hljs-formula { color: #6a737d !important; }
[data-theme="light"] .hljs-keyword,
[data-theme="light"] .hljs-doctag,
[data-theme="light"] .hljs-meta .hljs-keyword,
[data-theme="light"] .hljs-template-tag,
[data-theme="light"] .hljs-template-variable,
[data-theme="light"] .hljs-type,
[data-theme="light"] .hljs-variable.language_ { color: #d73a49 !important; }
[data-theme="light"] .hljs-title,
[data-theme="light"] .hljs-title.class_,
[data-theme="light"] .hljs-title.class_.inherited__,
[data-theme="light"] .hljs-title.function_ { color: #6f42c1 !important; }
[data-theme="light"] .hljs-attr,
[data-theme="light"] .hljs-attribute,
[data-theme="light"] .hljs-literal,
[data-theme="light"] .hljs-meta,
[data-theme="light"] .hljs-number,
[data-theme="light"] .hljs-operator,
[data-theme="light"] .hljs-selector-attr,
[data-theme="light"] .hljs-selector-class,
[data-theme="light"] .hljs-selector-id,
[data-theme="light"] .hljs-variable { color: #005cc5 !important; }
[data-theme="light"] .hljs-string,
[data-theme="light"] .hljs-meta .hljs-string,
[data-theme="light"] .hljs-regexp { color: #032f62 !important; }
[data-theme="light"] .hljs-symbol,
[data-theme="light"] .hljs-built_in { color: #e36209 !important; }
[data-theme="light"] .hljs-name,
[data-theme="light"] .hljs-quote,
[data-theme="light"] .hljs-selector-tag,
[data-theme="light"] .hljs-selector-pseudo { color: #22863a !important; }
[data-theme="light"] .hljs-section { color: #005cc5 !important; font-weight: 700 !important; }
[data-theme="light"] .hljs-bullet { color: #e36209 !important; }
[data-theme="light"] .hljs-emphasis { font-style: italic !important; }
[data-theme="light"] .hljs-strong { font-weight: 700 !important; }
[data-theme="light"] .hljs-addition { color: #22863a !important; background-color: #f0fff4 !important; }
[data-theme="light"] .hljs-deletion { color: #b31d28 !important; background-color: #ffeef0 !important; }

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --header-h: 4.75rem;
  --footer-h: 2.6rem;
  --composer-h: 7.5rem;
  --panel-h: calc(100dvh - var(--header-h) - var(--footer-h));
}

html {
  min-height: 100%;
  overflow-x: hidden;
  overflow-y: auto;
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-h);
  scroll-padding-bottom: calc(var(--footer-h) + var(--composer-h));
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100%;
  height: auto;
  max-height: none;
  overflow: visible;
  display: flex;
  flex-direction: column;
  line-height: 1.5;
  transition: background-color 0.25s ease, color 0.25s ease;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(var(--dot-grid-color) 1px, transparent 1px),
    linear-gradient(90deg, var(--dot-grid-color) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
  z-index: 0;
}

header {
  position: sticky;
  top: 0;
  z-index: 100;
  flex-shrink: 0;
  border-bottom: 1px solid var(--border);
  background: var(--header-bg);
  backdrop-filter: blur(12px);
  box-shadow: var(--header-shadow);
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}

.logo {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  object-fit: contain;
  flex-shrink: 0;
  display: block;
  background: var(--logo-bg);
  padding: 3px;
  box-sizing: border-box;
}

.brand h1 {
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--text);
}

.brand p {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.project-bar {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.75rem;
  padding: 0.35rem 0.5rem 0.35rem 0.75rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-muted);
  max-width: min(100%, 720px);
}

.project-label {
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-size: 0.65rem;
  flex-shrink: 0;
}

.project-id {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--text);
  overflow-wrap: anywhere;
  word-break: break-all;
  white-space: normal;
  line-height: 1.3;
}

.project-switch-btn {
  flex-shrink: 0;
  font-size: 0.72rem;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text);
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}

.project-switch-btn:hover {
  border-color: var(--accent);
  background: var(--user-bubble);
}

/* ---------------------------------------------------------------------
   Theme toggle (top-right corner)
   --------------------------------------------------------------------- */
.theme-toggle {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.3rem 0.7rem 0.3rem 0.4rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-muted);
  font-family: var(--font);
  font-size: 0.72rem;
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s, background 0.15s;
  flex-shrink: 0;
}

.theme-toggle:hover {
  border-color: var(--accent);
  color: var(--text);
}

.theme-toggle-track {
  position: relative;
  width: 28px;
  height: 16px;
  border-radius: 999px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  flex-shrink: 0;
  transition: background 0.2s ease, border-color 0.2s ease;
}

.theme-toggle-thumb {
  position: absolute;
  top: 1px;
  left: 1px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent);
  transition: transform 0.2s ease, background 0.2s ease;
}

[data-theme="dark"] .theme-toggle-thumb {
  transform: translateX(12px);
}

.theme-toggle-icon {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
  display: grid;
  place-items: center;
}

.theme-toggle-icon svg {
  width: 14px;
  height: 14px;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.theme-toggle-label {
  white-space: nowrap;
  letter-spacing: 0.02em;
}

[data-theme="light"] .theme-toggle-icon-sun { display: block; }
[data-theme="light"] .theme-toggle-icon-moon { display: none; }
[data-theme="dark"] .theme-toggle-icon-sun { display: none; }
[data-theme="dark"] .theme-toggle-icon-moon { display: block; }

.project-modal {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: grid;
  place-items: center;
  padding: 1rem;
}

.project-modal[hidden] {
  display: none;
}

.project-modal-backdrop {
  position: absolute;
  inset: 0;
  background: var(--backdrop-bg);
  backdrop-filter: blur(4px);
}

.project-modal-dialog {
  position: relative;
  width: min(100%, 640px);
  max-height: min(85vh, 640px);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  border: 1px solid var(--border);
  border-radius: calc(var(--radius) + 4px);
  background: var(--surface);
  box-shadow: 0 24px 64px var(--modal-shadow-color);
}

.project-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 1rem 1rem 0.5rem;
}

.project-modal-header h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
}

.project-modal-close {
  width: 2rem;
  height: 2rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 1.1rem;
  line-height: 1;
}

.project-modal-close:hover {
  color: var(--text);
  border-color: var(--accent);
}

.project-modal-hint {
  padding: 0 1rem 0.75rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.project-list {
  list-style: none;
  margin: 0;
  padding: 0 0.5rem;
  overflow-y: auto;
  flex: 1;
}

.project-list-item-wrap {
  display: flex;
  align-items: stretch;
  gap: 0.35rem;
  margin-bottom: 0.35rem;
}

.project-list-item {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.15rem;
  text-align: left;
  padding: 0.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface-2);
  color: var(--text);
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}


.project-list-item:hover,
.project-list-item.is-active {
  border-color: var(--accent);
  background: var(--user-bubble);
}

.project-list-item-id {
  font-family: var(--mono);
  font-size: 0.82rem;
  word-break: break-all;
  white-space: normal;
  line-height: 1.35;  width: 100%;
}

.project-list-item-meta {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.project-delete-btn {
  flex-shrink: 0;
  align-self: stretch;
  padding: 0 0.75rem;
  border: 1px solid var(--delete-border);
  border-radius: var(--radius);
  background: var(--delete-bg);
  color: var(--delete-color);
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s, color 0.15s;
}

.project-delete-btn:hover {
  border-color: var(--delete-border-hover);
  background: var(--delete-bg-hover);
  color: var(--delete-color-hover);
}

.project-modal-actions {
  padding: 0.75rem 1rem 1rem;
  border-top: 1px solid var(--border);
}

.project-new-btn {
  width: 100%;
  padding: 0.65rem 1rem;
  border-radius: var(--radius);
  border: 1px solid var(--accent-dim);
  background: var(--accent-strong-bg);
  color: #fff;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
}

.project-new-btn:hover {
  filter: brightness(1.08);
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  flex-shrink: 0;
  font-size: 0.75rem;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-muted);
}

.status-badge .dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--warning);
  animation: pulse 2s ease-in-out infinite;
}

.status-badge.connected .dot {
  background: var(--success);
  animation: none;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.workspace {
  position: relative;
  z-index: 1;
  flex: 1 0 auto;
  display: grid;
  --files-col: max(300px, 22vw);
  --preview-col: max(280px, 36%);
  grid-template-columns: var(--files-col) minmax(0, 1fr);
  align-items: start;
  gap: 0;
  width: 100%;
  min-height: var(--panel-h);
  overflow: visible;
}

.workspace.preview-open {
  grid-template-columns: var(--files-col) minmax(0, 1fr) var(--preview-col);
}

.chat-column {
  min-width: 0;
  min-height: var(--panel-h);
  overflow: visible;
  display: flex;
  flex-direction: column;
}

.files-panel {
  position: sticky;
  top: var(--header-h);
  z-index: 4;
  align-self: start;
  border-right: 1px solid var(--border);
  background: var(--files-panel-bg);
  display: flex;
  flex-direction: column;
  min-height: 0;
  min-width: 0;
  width: 100%;
  height: var(--panel-h);
  max-height: var(--panel-h);
  overflow: hidden;
  padding: 0.75rem 0.65rem 0.75rem 1rem;
}

.files-panel-header {
  position: sticky;
  top: 0;
  z-index: 2;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
  padding-bottom: 0.35rem;
  background: var(--files-panel-header-bg);
  backdrop-filter: blur(8px);
}

.files-panel-header h2 {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}

.files-refresh-btn {
  font-size: 0.72rem;
  padding: 0.2rem 0.5rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text-muted);
  cursor: pointer;
}

.files-refresh-btn:hover {
  color: var(--text);
  border-color: var(--accent);
}

.files-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.15rem;
  margin-bottom: 0.5rem;
  min-height: 1.25rem;
}

.files-crumb {
  font-family: var(--mono);
  font-size: 0.68rem;
  color: var(--accent);
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}

.files-crumb:hover {
  text-decoration: underline;
}

.files-crumb-sep {
  font-size: 0.68rem;
  color: var(--text-muted);
}

.files-list {
  list-style: none;
  overflow-y: auto;
  overscroll-behavior: contain;
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.files-empty {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.45;
  padding: 0.25rem 0.15rem;
}

.files-picker-hint {
  font-size: 0.75rem;
  color: var(--text-muted);
  line-height: 1.45;
  padding: 0.15rem 0.5rem 0.5rem;
  list-style: none;
}

.files-project-item .files-item-btn {
  width: 100%;
}

.files-item-row {
  display: flex;
  align-items: stretch;
  gap: 0.25rem;
}

.files-item-btn {
  flex: 1;
  min-width: 0;
  display: flex;
  align-items: flex-start;
  gap: 0.4rem;
  text-align: left;
  padding: 0.45rem 0.5rem;
  border-radius: 8px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--text);
  cursor: pointer;
}

.files-item-btn:hover {
  background: var(--surface-2);
  border-color: var(--border);
}

.files-item-icon {
  flex-shrink: 0;
  font-size: 0.85rem;
}

.files-item-name {
  flex: 1;
  min-width: 0;
  overflow-wrap: anywhere;
  word-break: break-word;
  white-space: normal;
  line-height: 1.35;
  font-size: 0.8rem;
}

.files-item-meta {
  flex-shrink: 0;
  font-size: 0.65rem;
  color: var(--text-muted);
}

.files-item-download {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.75rem;
  flex-shrink: 0;
  border-radius: 8px;
  border: 1px solid var(--border);
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.85rem;
}

.files-item-download:hover {
  color: var(--text);
  border-color: var(--accent);
}

/* Drag handles on the shared edges of the side panels. */
.panel-resizer {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 8px;
  z-index: 6;
  cursor: col-resize;
  touch-action: none;
  background: transparent;
  border: none;
  padding: 0;
  outline: none;
}

.panel-resizer::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 2px;
  width: 2px;
  background: transparent;
  transition: background-color 0.15s ease, opacity 0.15s ease;
  opacity: 0;
}

.panel-resizer:hover::after,
.panel-resizer:focus-visible::after,
.panel-resizer.is-active::after {
  background: var(--accent);
  opacity: 0.85;
}

.panel-resizer:focus-visible {
  outline: none;
}

.panel-resizer-files {
  right: 0;
}

.panel-resizer-preview {
  left: 0;
}

body.is-panel-resizing {
  cursor: col-resize;
  user-select: none;
}

body.is-panel-resizing iframe,
body.is-panel-resizing img {
  pointer-events: none;
}

.file-preview-panel {
  position: sticky;
  top: var(--header-h);
  z-index: 4;
  align-self: start;
  border-left: 1px solid var(--border);
  background: var(--preview-panel-bg);
  display: flex;
  flex-direction: column;
  min-height: 0;
  min-width: 0;
  width: 100%;
  height: var(--panel-h);
  max-height: var(--panel-h);
  overflow: hidden;
}

.file-preview-panel[hidden] {
  display: none;
}

.file-preview-header {
  position: sticky;
  top: 0;
  z-index: 2;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 0.75rem;
  border-bottom: 1px solid var(--border);
  background: var(--preview-header-bg);
  backdrop-filter: blur(10px);
  box-shadow: var(--preview-header-shadow);
}

.file-preview-name {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--text);
}

.file-preview-badge {
  font-size: 0.62rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.15rem 0.45rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--success);
  border: 1px solid var(--accent-soft);
}

.file-preview-download {
  font-size: 0.72rem;
  color: var(--accent);
  text-decoration: none;
  padding: 0.2rem 0.45rem;
  border: 1px solid var(--border);
  border-radius: 8px;
}

.file-preview-download:hover {
  border-color: var(--accent);
}

.file-preview-close {
  width: 1.75rem;
  height: 1.75rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 1rem;
  line-height: 1;
}

.file-preview-close:hover {
  color: var(--text);
  border-color: var(--accent);
}

.file-preview-content {
  flex: 1;
  min-height: 0;
  margin: 0;
  padding: 0.75rem;
  overflow: auto;
  overscroll-behavior: contain;
  font-family: var(--mono);
  font-size: 0.75rem;
  line-height: 1.5;
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--text);
}

main {
  position: relative;
  z-index: 1;
  flex: 1;
  display: flex;
  flex-direction: column;
  width: 100%;
  max-width: none;
  margin: 0;
  padding: 1rem 0 0;
  min-height: var(--panel-h);
  overflow: visible;
}

/* Centered content column for welcome; composer stays full chat-column width. */
.welcome {
  width: 80%;
  max-width: none;
  margin-left: auto;
  margin-right: auto;
  padding: 2.5rem clamp(0.75rem, 1.5vw, 1.5rem) 1.5rem;
  box-sizing: border-box;
  text-align: center;
}

.welcome h2 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  letter-spacing: -0.02em;
  color: var(--text);
}

.welcome p {
  color: var(--text-muted);
  font-size: 0.95rem;
  max-width: 520px;
  margin: 0 auto 1.25rem;
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
}

.chip {
  font-size: 0.8rem;
  padding: 0.4rem 0.85rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-muted);
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s, background 0.15s;
}

.chip:hover {
  border-color: var(--accent);
  color: var(--text);
  background: var(--surface-2);
}

#chat-log {
  flex: 1 0 auto;
  overflow: visible;
  /* Side padding keeps messages aligned with the 80% welcome/composer column.
     The document/viewport is the chat scrollport (see html overflow-y). */
  padding: 0.5rem calc(10% + clamp(0.75rem, 1.5vw, 1.5rem)) 1rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  min-height: 200px;
  box-sizing: border-box;
}

#chat-log:empty {
  display: none;
}

.message {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  max-width: 85%;
  min-width: 0;
  box-sizing: border-box;
  animation: fadeIn 0.25s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

.message.user {
  align-self: flex-end;
  align-items: flex-end;
}

.message.agent {
  /* Definite width so large renders (e.g. 3840px) can scale with max-width: 100%. */
  align-self: flex-start;
  align-items: stretch;
  width: 100%;
  max-width: 100%;
}

.message .label {
  font-size: 0.7rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0 0.25rem;
}

.message .bubble {
  padding: 0.75rem 1rem;
  border-radius: var(--radius);
  font-size: 0.95rem;
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--text);
  min-width: 0;
  max-width: 100%;
  overflow-x: auto;
}

.message .bubble.markdown {
  white-space: normal;
}

.message .bubble.markdown > *:first-child {
  margin-top: 0;
}

.message .bubble.markdown > *:last-child {
  margin-bottom: 0;
}

.message .bubble.markdown p,
.message .bubble.markdown ul,
.message .bubble.markdown ol,
.message .bubble.markdown pre,
.message .bubble.markdown table,
.message .bubble.markdown blockquote,
.message .bubble.markdown .katex-display {
  margin: 0.6rem 0;
}

.message .bubble.markdown h1,
.message .bubble.markdown h2,
.message .bubble.markdown h3,
.message .bubble.markdown h4 {
  margin: 0.85rem 0 0.4rem;
  font-weight: 600;
  line-height: 1.3;
  color: var(--text);
}

.message .bubble.markdown h1 { font-size: 1.2rem; }
.message .bubble.markdown h2 { font-size: 1.1rem; }
.message .bubble.markdown h3 { font-size: 1.05rem; }

.message .bubble.markdown ul,
.message .bubble.markdown ol {
  padding-left: 1.35rem;
}

.message .bubble.markdown li + li {
  margin-top: 0.25rem;
}

.message .bubble.markdown a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.message .bubble.markdown code {
  font-family: var(--mono);
  font-size: 0.85em;
  background: var(--code-bg);
  padding: 0.1rem 0.35rem;
  border-radius: 4px;
  color: var(--text);
}

.message .bubble.markdown pre {
  background: var(--code-block-bg);
  border: 1px solid var(--code-block-border);
  border-radius: 8px;
  padding: 0.75rem;
  overflow-x: auto;
  font-size: 0.85rem;
  line-height: 1.45;
  color: var(--text);
}

.message .bubble.markdown pre code {
  background: none;
  padding: 0;
  font-size: inherit;
  color: inherit;
}

.message .bubble.markdown table {
  width: max-content;
  min-width: 100%;
  max-width: none;
  border-collapse: collapse;
  font-size: 0.9rem;
  display: table;
}

.message .bubble.markdown .markdown-table-scroll {
  width: 100%;
  max-width: 100%;
  overflow-x: auto;
  overscroll-behavior-inline: contain;
  scrollbar-gutter: stable;
}

.message .bubble.markdown th,
.message .bubble.markdown td {
  border: 1px solid var(--border);
  padding: 0.45rem 0.65rem;
  text-align: left;
  vertical-align: top;
  white-space: nowrap;
  overflow-wrap: normal;
  word-break: normal;
}

.message .bubble.markdown th {
  background: var(--table-th-bg);
  font-weight: 600;
}

.message .bubble.markdown td:last-child {
  min-width: 10rem;
  max-width: 24rem;
  white-space: normal;
}

.message .bubble.markdown blockquote {
  border-left: 3px solid var(--accent-dim);
  padding-left: 0.85rem;
  color: var(--text-muted);
}

.message .bubble.markdown .katex-display {
  overflow-x: auto;
  overflow-y: hidden;
  padding: 0.25rem 0;
}

.message .bubble.markdown .katex {
  font-size: 1.05em;
}

.message .bubble.agent-live {
  white-space: normal;
  min-width: min(100%, 320px);
}

.progress-panel {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.progress-status {
  display: inline-flex;
  align-items: flex-start;
  gap: 0.55rem;
  color: var(--text-muted);
  font-size: 0.88rem;
  max-width: 100%;
}

.progress-status-copy {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  min-width: 0;
}

.progress-status-text {
  color: var(--text);
  font-weight: 500;
  line-height: 1.35;
}

.progress-status-hint {
  color: var(--text-muted);
  font-size: 0.8rem;
  line-height: 1.4;
}

.progress-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  animation: pulse 1.4s ease-in-out infinite;
  flex-shrink: 0;
  margin-top: 0.35rem;
}

.progress-status[data-stage="planning"] .progress-dot {
  background: var(--stage-planning);
}

.progress-status[data-stage="reasoning"] .progress-dot {
  background: var(--stage-reasoning);
}

.progress-status[data-stage="tool-waiting"] .progress-dot {
  background: var(--stage-tool-waiting);
  animation: pulse 0.9s ease-in-out infinite;
}

.progress-status[data-stage="composing"] .progress-dot {
  background: var(--stage-composing);
}

.progress-status[data-stage="streaming"] .progress-dot {
  background: var(--stage-streaming);
}

.progress-steps {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin: 0;
  padding: 0;
}

.progress-step {
  font-size: 0.82rem;
  line-height: 1.45;
  color: var(--text-muted);
  padding: 0.45rem 0.65rem;
  border-radius: 8px;
  background: var(--tool-step-bg);
  border: 1px solid var(--border);
  word-break: break-word;
}

.progress-step.tool {
  border-color: var(--tool-call-border);
  color: var(--text);
}

.progress-step.tool-call {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  border-color: var(--tool-call-border);
  color: var(--text);
}

.progress-step.tool-call.is-running {
  border-color: var(--tool-call-border-strong);
  box-shadow: 0 0 0 1px var(--accent-soft);
}

.progress-step.tool-call.is-done {
  border-style: solid;
  opacity: 0.92;
}

.tool-call-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.tool-call-label {
  font-weight: 500;
  min-width: 0;
  word-break: break-word;
  color: var(--text);
}

.tool-call-status {
  flex-shrink: 0;
  font-size: 0.75rem;
  color: var(--accent);
}

.tool-call-status.is-done {
  color: var(--success);
  font-weight: 600;
  letter-spacing: 0.02em;
}

.tool-dots {
  display: inline-flex;
  align-items: flex-end;
  gap: 0.1rem;
  min-width: 1.25rem;
  height: 1em;
}

.tool-dots span {
  animation: tool-dot-pulse 1.2s ease-in-out infinite;
  opacity: 0.25;
}

.tool-dots span:nth-child(2) {
  animation-delay: 0.15s;
}

.tool-dots span:nth-child(3) {
  animation-delay: 0.3s;
}

@keyframes tool-dot-pulse {
  0%,
  80%,
  100% {
    opacity: 0.2;
    transform: translateY(0);
  }

  40% {
    opacity: 1;
    transform: translateY(-2px);
  }
}

.tool-call-input,
.tool-call-output {
  font-size: 0.78rem;
  line-height: 1.45;
  color: var(--text-muted);
  word-break: break-word;
  padding-left: 0.1rem;
}

.tool-call-payload-label {
  margin-top: 0.1rem;
  color: var(--text-muted);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.tool-call-output {
  padding-top: 0.35rem;
  border-top: 1px dashed var(--border);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  white-space: pre-wrap;
}

.agent-result-step {
  border-color: var(--accent-dim);
  background: var(--accent-soft);
}

.agent-result-step.is-streaming {
  border-color: var(--tool-call-border-strong);
  box-shadow: 0 0 0 1px var(--accent-soft);
}

.agent-result-output {
  max-height: 320px;
  overflow-y: auto;
  padding: 0.35rem 0.1rem 0;
  border-top: 1px dashed var(--border);
  color: var(--text);
  font-size: 0.8rem;
  line-height: 1.5;
  font-family: inherit;
  white-space: pre-wrap;
  word-break: break-word;
}

.tool-call-substeps {
  list-style: none;
  margin: 0.35rem 0 0;
  padding: 0 0 0 0.85rem;
  border-left: 2px solid var(--tool-call-substeps-border);
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.chat-render {
  margin: 0.75rem 0 0;
  padding: 0;
  width: 50%;
  max-width: 50%;
}

.chat-render a {
  display: block;
  width: 100%;
  border: 1px solid var(--chat-render-border);
  border-radius: 8px;
  overflow: hidden;
  background: var(--chat-render-bg);
}

.chat-render img,
img.chat-render-inline,
.stream-text img,
.message .bubble img {
  display: block;
  height: auto;
  cursor: zoom-in;
}

.chat-render img {
  width: 100%;
  max-width: 100%;
}

.stream-text img,
.message .bubble img,
img.chat-render-inline {
  width: 50%;
  max-width: 50%;
}

img.chat-render-inline {
  margin: 0.75rem 0 0;
  border: 1px solid var(--chat-render-border);
  border-radius: 8px;
  background: var(--chat-render-bg);
}

.chat-render figcaption {
  margin-top: 0.35rem;
  font-size: 0.75rem;
  color: var(--text-muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  word-break: break-all;
}

.tool-call-nested {
  border-color: var(--tool-call-border);
  background: var(--tool-call-bg);
}

.tool-call-nested .tool-call-label {
  font-size: 0.88rem;
}

.tool-reasoning {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: 0.35rem 0 0.15rem;
}

.tool-reasoning .progress-section-label {
  margin: 0;
}

.tool-reasoning .thinking-stream {
  max-height: 180px;
}

.progress-step.tool-done {
  border-style: dashed;
  opacity: 0.85;
}

.progress-step.thinking {
  font-style: italic;
  border-color: var(--thinking-border);
}

.stream-text {
  white-space: pre-wrap;
  word-break: break-word;
  font-size: 0.95rem;
  line-height: 1.55;
  color: var(--text);
  min-width: 0;
  max-width: 100%;
}

.thinking-stream {
  font-size: 0.84rem;
  line-height: 1.5;
  color: var(--text-muted);
  font-style: italic;
  white-space: pre-wrap;
  word-break: break-word;
  max-height: 180px;
  overflow-y: auto;
  padding: 0.55rem 0.7rem;
  border-radius: 8px;
  border: 1px solid var(--thinking-border);
  background: var(--thinking-bg);
}

.progress-collapsed {
  margin-bottom: 0.75rem;
}

.progress-details {
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--tool-step-bg);
  overflow: hidden;
}

.progress-details-summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.55rem 0.75rem;
  font-size: 0.82rem;
  color: var(--text-muted);
  user-select: none;
}

.progress-details-summary::-webkit-details-marker {
  display: none;
}

.progress-details-summary::before {
  content: "▸";
  font-size: 0.72rem;
  color: var(--accent);
  transition: transform 0.15s ease;
}

.progress-details[open] .progress-details-summary::before {
  transform: rotate(90deg);
}

.progress-details-summary:hover {
  color: var(--text);
  background: var(--hover-overlay);
}

.progress-details-body {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  padding: 0 0.75rem 0.75rem;
  border-top: 1px solid var(--border);
}

.progress-live-body {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  margin-top: 0.55rem;
}

.progress-section {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.progress-section-label {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-muted);
  opacity: 0.85;
}

.progress-collapsed .thinking-stream {
  max-height: 240px;
}

.stream-text.markdown {
  white-space: normal;
}

.stream-text.markdown > *:first-child {
  margin-top: 0;
}

.stream-text.markdown > *:last-child {
  margin-bottom: 0;
}

.message.user .bubble {
  background: var(--user-bubble);
  border: 1px solid var(--accent-dim);
  border-bottom-right-radius: 4px;
}

.message.agent .bubble {
  background: var(--agent-bubble);
  border: 1px solid var(--border);
  border-bottom-left-radius: 4px;
}

.message.system .bubble {
  background: transparent;
  border: 1px dashed var(--border);
  color: var(--text-muted);
  font-size: 0.85rem;
  font-style: italic;
}

.typing {
  display: inline-flex;
  gap: 4px;
  padding: 0.25rem 0;
}

.typing span {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--text-muted);
  animation: bounce 1.2s ease-in-out infinite;
}

.typing span:nth-child(2) { animation-delay: 0.15s; }
.typing span:nth-child(3) { animation-delay: 0.3s; }

@keyframes bounce {
  0%, 60%, 100% { transform: translateY(0); }
  30% { transform: translateY(-4px); }
}

.composer {
  position: fixed;
  z-index: 12;
  left: var(--files-col);
  right: 0;
  bottom: var(--footer-h);
  width: auto;
  box-sizing: border-box;
  padding: 1rem calc(10% + clamp(0.75rem, 1.5vw, 1.5rem)) 1.25rem;
  background: linear-gradient(to top, var(--composer-gradient-start) 70%, var(--composer-gradient-end));
}

/* A fixed composer is outside normal flow. Reserve its live measured height,
   plus the fixed footer, so the final message can always scroll fully above it. */
.composer-spacer {
  flex: 0 0 calc(var(--composer-h) + var(--footer-h));
  width: 100%;
  height: calc(var(--composer-h) + var(--footer-h));
  pointer-events: none;
}

.workspace.preview-open .composer {
  right: var(--preview-col);
}

.plan-approval {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.9rem;
  margin-bottom: 0.55rem;
  padding: 0.7rem 0.8rem;
  border: 1px solid color-mix(in srgb, var(--accent) 48%, var(--border));
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--accent) 8%, var(--surface));
  box-shadow: 0 4px 14px color-mix(in srgb, var(--shadow-color) 35%, transparent);
}

.plan-approval[hidden] {
  display: none;
}

.plan-approval-copy {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 0.18rem;
}

.plan-approval-copy strong {
  color: var(--text);
  font-size: 0.86rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.plan-approval-copy span {
  color: var(--text-muted);
  font-family: var(--mono);
  font-size: 0.7rem;
}

.plan-approval-actions {
  flex-shrink: 0;
  display: flex;
  gap: 0.45rem;
}

.plan-approval-actions button {
  min-height: 34px;
  border-radius: 7px;
  padding: 0.42rem 0.72rem;
  font: inherit;
  font-size: 0.78rem;
  font-weight: 650;
  cursor: pointer;
}

.plan-request-changes-btn {
  border: 1px solid var(--border);
  color: var(--text);
  background: var(--surface);
}

.plan-approve-btn {
  border: 1px solid var(--accent);
  color: #fff;
  background: var(--accent);
}

.plan-approval-actions button:hover:not(:disabled) {
  filter: brightness(1.06);
}

.plan-approval-actions button:disabled {
  cursor: not-allowed;
  opacity: 0.45;
}

.composer-input {
  position: relative;
}

.slash-menu {
  position: absolute;
  left: 0;
  right: 0;
  bottom: calc(100% + 0.35rem);
  z-index: 20;
  display: grid;
  gap: 0.15rem;
  padding: 0.35rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.14);
}

.slash-menu[hidden] {
  display: none;
}

.slash-menu-item {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  width: 100%;
  border: none;
  border-radius: 7px;
  padding: 0.55rem 0.7rem;
  text-align: left;
  font: inherit;
  color: var(--text);
  background: transparent;
  cursor: pointer;
}

.slash-menu-item:hover,
.slash-menu-item.is-active {
  background: var(--accent-soft);
}

.slash-menu-cmd {
  flex-shrink: 0;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.86rem;
  font-weight: 650;
  color: var(--accent);
}

.slash-menu-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.input-row {
  display: flex;
  gap: 0.5rem;
  align-items: flex-end;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.5rem 0.5rem 0.5rem 1rem;
  transition: border-color 0.15s;
}

.input-row:focus-within {
  border-color: var(--accent);
}

#user-input {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--text);
  font-family: var(--font);
  font-size: 0.95rem;
  resize: none;
  min-height: 24px;
  max-height: 160px;
  line-height: 1.5;
  outline: none;
  padding: 0.35rem 0;
}

#user-input::placeholder {
  color: var(--text-muted);
}

#send-btn,
#stop-btn {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border: none;
  border-radius: 8px;
  color: #fff;
  cursor: pointer;
  display: grid;
  place-items: center;
  transition: background 0.15s, opacity 0.15s;
}

#send-btn {
  background: var(--accent);
}

#stop-btn {
  background: var(--stop-btn);
}

#stop-btn[hidden] {
  display: none;
}

#send-btn:hover:not(:disabled) {
  background: var(--accent-dim);
}

#stop-btn:hover:not(:disabled) {
  background: var(--stop-btn-hover);
}

#send-btn:disabled,
#stop-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

#send-btn svg,
#stop-btn svg {
  width: 18px;
  height: 18px;
}

.hint {
  margin-top: 0.5rem;
  font-size: 0.72rem;
  color: var(--text-muted);
  text-align: center;
}

.hint code {
  font-family: var(--mono);
  font-size: 0.7rem;
  background: var(--surface);
  padding: 0.1rem 0.35rem;
  border-radius: 4px;
  color: var(--text);
}

footer {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 18;
  flex-shrink: 0;
  text-align: center;
  padding: 0.75rem;
  font-size: 0.75rem;
  color: var(--text-muted);
  border-top: 1px solid var(--footer-top-border);
  background: var(--header-bg);
  backdrop-filter: blur(12px);
}

@media (max-width: 900px) {
  .workspace,
  .workspace.preview-open {
    grid-template-columns: 1fr;
    grid-template-rows: auto minmax(0, 1fr) auto;
    overflow: visible;
    align-items: stretch;
  }

  .panel-resizer {
    display: none;
  }

  .files-panel {
    position: static;
    top: auto;
    border-right: none;
    border-bottom: 1px solid var(--border);
    height: auto;
    max-height: 220px;
    flex-shrink: 0;
  }

  .file-preview-panel {
    position: static;
    top: auto;
    border-left: none;
    border-top: 1px solid var(--border);
    height: auto;
    max-height: min(40vh, 320px);
    flex-shrink: 0;
    margin-bottom: calc(var(--composer-h) + var(--footer-h));
  }

  .chat-column,
  main {
    min-height: 0;
  }

  .composer,
  .workspace.preview-open .composer {
    left: 0;
    right: 0;
  }

  .welcome {
    width: 100%;
  }

  #chat-log,
  .composer {
    padding-left: clamp(0.75rem, 1.5vw, 1.5rem);
    padding-right: clamp(0.75rem, 1.5vw, 1.5rem);
  }
}

@media (max-width: 600px) {
  .welcome { padding-top: 1.5rem; }
  .message { max-width: 95%; }
  .message.agent { width: 100%; max-width: 100%; }
  .theme-toggle-label { display: none; }
  .plan-approval { align-items: stretch; flex-direction: column; }
  .plan-approval-actions { width: 100%; }
  .plan-approval-actions button { flex: 1; }
}

html:has(body.modal-open) {
  overflow: hidden;
}

body.modal-open {
  overflow: hidden;
}

.image-modal {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: flex;
  flex-direction: column;
  padding: 0;
}

.image-modal[hidden] {
  display: none;
}

.image-modal-backdrop {
  position: absolute;
  inset: 0;
  background: var(--image-backdrop-bg);
  backdrop-filter: blur(3px);
}

.image-modal-dialog {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  width: 100%;
  height: 100%;
}

.image-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.6rem 0.9rem;
  background: var(--image-modal-header-bg);
  border-bottom: 1px solid var(--border);
}

.image-modal-name {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--text-muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.image-modal-tools {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex-shrink: 0;
}

.image-modal-btn {
  min-width: 2rem;
  height: 2rem;
  padding: 0 0.55rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 1rem;
  line-height: 1;
  text-decoration: none;
}

.image-modal-btn:hover {
  color: var(--text);
  border-color: var(--accent);
}

.image-zoom-level {
  min-width: 3.2rem;
  text-align: center;
  font-size: 0.78rem;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

.image-modal-stage {
  position: relative;
  flex: 1;
  overflow: hidden;
  display: grid;
  place-items: center;
  cursor: grab;
  touch-action: none;
}

.image-modal-stage.is-dragging {
  cursor: grabbing;
}

.image-modal-img {
  max-width: 100%;
  max-height: 100%;
  transform-origin: 0 0;
  user-select: none;
  -webkit-user-drag: none;
  will-change: transform;
}