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

/*
  Design tokens: semantic names describe each color's job, not its hue.
  This keeps the interface forkable: themes change values while components
  keep using the same roles.
*/
:root {
  --background: #F8FAFC;
  --foreground: #0F172A;
  --surface: #FFFFFF;
  --surface-muted: #F1F5F9;
  --muted: #E2E8F0;
  --muted-strong: #CBD5E1;
  --muted-foreground: #64748B;
  --foreground-soft: #334155;
  --primary: #2563EB;
  --primary-hover: #1D4ED8;
  --primary-foreground: #FFFFFF;
  --primary-muted: #EFF6FF;
  --destructive: #B91C1C;
  --destructive-muted: #FEF2F2;
  --success: #15803D;
  --border: #E2E8F0;
  --input: #CBD5E1;
  --ring: #3B82F6;
  --code-bg: #0F172A;
  --code-fg: #E2E8F0;
  --code-inline-bg: #F1F5F9;
  --code-inline-fg: #BE185D;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow: 0 1px 3px rgba(15, 23, 42, 0.08), 0 1px 2px rgba(15, 23, 42, 0.04);
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Cascadia Code', 'Fira Code', ui-monospace, monospace;
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 0.9375rem;
  --text-md: 1rem;
  --text-lg: 1.125rem;
  --leading-normal: 1.5;
  --leading-relaxed: 1.65;
  --radius-sm: 6px;
  --radius: 10px;
  --radius-lg: 14px;
  --sidebar-w: 280px;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --duration-fast: 120ms;

  --bg: var(--background);
  --text: var(--foreground);
  --text-dim: var(--muted-foreground);
  --surface2: var(--muted);
  --accent: var(--primary);
  --user-bg: var(--primary-muted);
  --text-secondary: var(--muted-foreground);
}

[data-theme="dark"] {
  --background: #0B1220;
  --foreground: #F8FAFC;
  --surface: #111827;
  --surface-muted: #1F2937;
  --muted: #273449;
  --muted-strong: #3B475C;
  --muted-foreground: #9CA3AF;
  --foreground-soft: #CBD5E1;
  --primary: #60A5FA;
  --primary-hover: #93C5FD;
  --primary-foreground: #07111F;
  --primary-muted: rgba(96, 165, 250, 0.14);
  --destructive: #F87171;
  --destructive-muted: rgba(248, 113, 113, 0.12);
  --success: #4ADE80;
  --border: #273449;
  --input: #3B475C;
  --ring: #60A5FA;
  --code-bg: #020617;
  --code-fg: #E2E8F0;
  --code-inline-bg: #1F2937;
  --code-inline-fg: #F472B6;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.35);
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.45);
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  background: var(--bg);
  color: var(--text);
  height: 100dvh;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-feature-settings: 'cv02', 'cv03', 'cv04', 'cv11';
}

button, input, textarea, select { font: inherit; }
button { transition: background var(--duration-fast) var(--ease), border-color var(--duration-fast) var(--ease), color var(--duration-fast) var(--ease), opacity var(--duration-fast) var(--ease); }
*:focus-visible { outline: 2px solid var(--ring); outline-offset: 2px; }

.icon {
  width: 1rem;
  height: 1rem;
  flex: 0 0 auto;
  stroke-width: 2;
  vertical-align: middle;
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 36px;
  min-height: 36px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface-muted);
  color: var(--text-dim);
  cursor: pointer;
}

.icon-btn:hover { color: var(--text); border-color: var(--muted-strong); }

/* --- Login screen --- */
#login-screen {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100dvh;
  padding: 2rem;
}

.login-box {
  background: var(--surface);
  padding: 2.5rem;
  border-radius: var(--radius);
  width: 100%;
  max-width: 360px;
  text-align: center;
}

.login-box h1 { font-size: 1.5rem; margin-bottom: 0.5rem; }
.login-box p { color: var(--text-dim); margin-bottom: 1.5rem; font-size: 0.9rem; }

.login-box input {
  width: 100%;
  padding: 0.8rem 1rem;
  border: 1px solid var(--surface2);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
  font-size: 1rem;
  margin-bottom: 1rem;
}

.login-box button {
  width: 100%;
  padding: 0.8rem;
  background: var(--accent);
  color: #FFFFFF;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  cursor: pointer;
  font-weight: 600;
}

.login-box button:hover { opacity: 0.9; }

.login-error {
  color: var(--destructive);
  font-size: 0.85rem;
  margin-top: 0.5rem;
  min-height: 1.2em;
}

/* --- App layout --- */
#chat-screen {
  display: none;
  height: 100dvh;
}

#chat-screen.active {
  display: flex;
}

/* --- Sidebar --- */
#sidebar {
  width: var(--sidebar-w);
  min-width: var(--sidebar-w);
  background: var(--surface);
  border-right: 1px solid var(--surface2);
  display: flex;
  flex-direction: column;
  height: 100%;
}

#sidebar-header {
  padding: 0.8rem;
  border-bottom: 1px solid var(--surface2);
  display: flex;
  gap: 0.5rem;
}

#sidebar-header button {
  flex: 1;
  padding: 0.5rem;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.8rem;
  font-weight: 600;
}

#new-chat-btn {
  background: var(--accent);
  color: #FFFFFF;
}

#new-chat-btn:hover { opacity: 0.9; }

#logout-btn {
  background: var(--surface2);
  color: var(--text-dim);
  flex: 0 0 auto;
  padding: 0.5rem 0.7rem;
}

#logout-btn:hover { color: var(--text); }

.usage-summary {
  color: var(--text-dim);
  font-size: 0.75rem;
  white-space: nowrap;
}

.share-control {
  position: relative;
  display: inline-flex;
}

.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.35rem 0.6rem;
  border: 1px solid var(--surface2);
  border-radius: 6px;
  background: var(--bg);
  color: var(--text-dim);
  font-size: 0.78rem;
  cursor: pointer;
  white-space: nowrap;
}
.share-btn:hover { border-color: var(--accent); color: var(--text); }
.share-btn.shared { color: var(--accent); border-color: var(--accent); }
.share-btn:disabled { opacity: 0.6; cursor: not-allowed; }

.share-panel {
  position: absolute;
  top: calc(100% + 0.5rem);
  right: 0;
  z-index: 20;
  width: min(360px, calc(100vw - 2rem));
  padding: 0.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.share-panel-title {
  font-size: var(--text-sm);
  font-weight: 700;
  margin-bottom: 0.6rem;
}

.share-add-row,
.share-member-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto auto;
  gap: 0.4rem;
  align-items: center;
}

.share-add-row select,
.share-member-row select {
  min-width: 0;
  padding: 0.35rem 0.45rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg);
  color: var(--text);
  font-size: var(--text-xs);
}

.share-add-row button,
.share-remove-btn {
  min-height: 32px;
  padding: 0.3rem 0.55rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface-muted);
  color: var(--text);
  cursor: pointer;
  font-size: var(--text-xs);
}

.share-add-row button:disabled { opacity: 0.5; cursor: not-allowed; }
.share-member-list { display: grid; gap: 0.45rem; margin-top: 0.65rem; }
.share-member-row span { min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: var(--text-sm); }
.share-remove-btn { display: inline-flex; align-items: center; justify-content: center; color: var(--destructive); }
.share-empty { color: var(--text-dim); font-size: var(--text-sm); padding: 0.35rem 0; }

#user-name {
  display: flex;
  align-items: center;
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-left: auto;
  padding: 0 0.5rem;
}

#search-conversations {
  width: calc(100% - 1rem);
  margin: 0.4rem 0.5rem 0;
  padding: 0.45rem 0.6rem;
  border: 1px solid var(--input);
  border-radius: 6px;
  background: var(--surface-muted);
  color: var(--text);
  font-size: 0.85rem;
  outline: none;
}
#search-conversations:focus {
  border-color: #666;
}
#search-conversations::placeholder {
  color: var(--text-dim);
}

#conversation-list {
  flex: 1;
  overflow-y: auto;
  padding: 0.4rem;
}

.conv-item {
  display: flex;
  align-items: center;
  padding: 0.6rem 0.7rem;
  border-radius: 8px;
  cursor: pointer;
  margin-bottom: 2px;
  position: relative;
}

.conv-item:hover { background: var(--surface2); }
.conv-item.active { background: var(--surface2); }

.conv-item-title {
  font-size: 0.85rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--text-dim);
}

.conv-item-main {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.conv-item-meta {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  color: var(--text-dim);
  font-size: 0.72rem;
  min-width: 0;
}

.conv-item-meta .tiny {
  width: 0.75rem;
  height: 0.75rem;
}

.conv-item.active .conv-item-title { color: var(--text); }

.conv-item-actions {
  display: none;
  gap: 0.1rem;
}

.conv-item:hover .conv-item-actions { display: flex; }

.conv-item-btn {
  background: none;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  font-size: 0.9rem;
  padding: 0 0.3rem;
  line-height: 1;
}

.conv-item-btn:hover { color: var(--accent); }
.conv-item-btn.export:hover { color: #15803D; }

.conv-section-label {
  margin: 0.75rem 0.45rem 0.25rem;
  color: var(--text-dim);
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
}

/* --- Main panel --- */
#main-panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  position: relative;
}

header {
  padding: 0.8rem 1.2rem;
  background: var(--surface);
  border-bottom: 1px solid var(--surface2);
  display: flex;
  align-items: center;
  gap: 0.8rem;
}

#sidebar-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text);
  font-size: 1.3rem;
  cursor: pointer;
  padding: 0.2rem;
}

header h1 {
  font-size: 1.1rem;
  font-weight: 600;
}

#prompt-select {
  margin-left: auto;
  padding: 0.35rem 0.6rem;
  border: 1px solid var(--surface2);
  border-radius: 6px;
  background: var(--bg);
  color: var(--text);
  font-size: 0.8rem;
  cursor: pointer;
}

#prompt-select:focus { outline: none; border-color: var(--accent); }

#model-select {
  padding: 0.35rem 0.6rem;
  border: 1px solid var(--surface2);
  border-radius: 6px;
  background: var(--bg);
  color: var(--text);
  font-size: 0.8rem;
  cursor: pointer;
}

#model-select:focus { outline: none; border-color: var(--accent); }

#messages {
  flex: 1;
  overflow-y: auto;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.message {
  max-width: 80%;
  padding: 0.9rem 1.1rem;
  border-radius: var(--radius);
  line-height: 1.5;
  word-wrap: break-word;
  font-size: 0.95rem;
}

.message.user {
  align-self: flex-end;
  background: var(--user-bg);
  border-bottom-right-radius: 4px;
  white-space: pre-wrap;
}

.message-author {
  margin-bottom: 0.25rem;
  color: var(--text-dim);
  font-size: var(--text-xs);
  font-weight: 700;
}

.message.assistant {
  align-self: flex-start;
  background: var(--surface);
  border: 1px solid var(--surface2);
  border-bottom-left-radius: 4px;
}

/* --- Markdown in assistant messages --- */
.message.assistant p { margin: 0.4em 0; }
.message.assistant h1,
.message.assistant h2,
.message.assistant h3,
.message.assistant h4 { margin: 0.8em 0 0.3em; font-weight: 600; }
.message.assistant h1 { font-size: 1.2em; }
.message.assistant h2 { font-size: 1.1em; }
.message.assistant h3 { font-size: 1.0em; }
.message.assistant ul, .message.assistant ol { margin: 0.4em 0; padding-left: 1.5em; }
.message.assistant li { margin: 0.2em 0; }
.message.assistant code {
  background: #F1F5F9;
  padding: 0.15em 0.4em;
  border-radius: 4px;
  font-size: 0.88em;
  font-family: 'Cascadia Code', 'Fira Code', monospace;
}
.message.assistant pre {
  background: #1E293B;
  color: #E2E8F0;
  padding: 0.8rem 1rem;
  border-radius: 8px;
  overflow-x: auto;
  margin: 0.6em 0;
}
.message.assistant pre code {
  background: none;
  padding: 0;
  color: inherit;
  font-size: 0.85em;
}
.message.assistant blockquote {
  border-left: 3px solid var(--surface2);
  padding-left: 0.8em;
  margin: 0.5em 0;
  color: var(--text-dim);
}
.message.assistant table {
  border-collapse: collapse;
  margin: 0.5em 0;
  font-size: 0.9em;
}
.message.assistant th, .message.assistant td {
  border: 1px solid var(--surface2);
  padding: 0.4em 0.7em;
}
.message.assistant th { background: var(--bg); font-weight: 600; }
.message.assistant a { color: var(--accent); text-decoration: underline; }

.usage-info {
  font-size: 0.75rem;
  color: var(--text-dim);
  text-align: center;
  padding: 0.3rem;
}

/* --- Input area --- */
#input-area {
  padding: 0.8rem 1rem;
  background: var(--surface);
  border-top: 1px solid var(--surface2);
  display: flex;
  gap: 0.6rem;
  align-items: flex-end;
  position: relative;
}

.readonly-notice {
  position: absolute;
  left: 1rem;
  right: 1rem;
  top: -2rem;
  padding: 0.45rem 0.65rem;
  border: 1px solid var(--surface2);
  border-radius: 6px;
  background: var(--surface);
  color: var(--text-dim);
  font-size: 0.8rem;
}

#input-area textarea {
  flex: 1;
  padding: 0.7rem 1rem;
  border: 1px solid var(--surface2);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
  font-size: 0.95rem;
  font-family: inherit;
  resize: none;
  max-height: 150px;
  min-height: 44px;
  line-height: 1.4;
}

#input-area textarea:focus {
  outline: none;
  border-color: var(--accent);
}

#file-btn {
  background: none;
  border: 1px solid var(--surface2);
  border-radius: 8px;
  padding: 0.5rem 0.7rem;
  cursor: pointer;
  font-size: 1.2rem;
  min-height: 44px;
  display: flex;
  align-items: center;
}
#file-btn:hover { border-color: var(--accent); }
#file-btn.has-file { border-color: var(--accent); background: var(--surface2); }

#file-preview-bar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 1rem;
  background: var(--surface);
  border-top: 1px solid var(--surface2);
}
#file-preview-icon {
  font-size: 1.5rem;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
  background: var(--bg);
}
#file-preview-thumb {
  width: 40px;
  height: 40px;
  object-fit: cover;
  border-radius: 4px;
}
#file-preview-name {
  font-size: 0.8rem;
  color: var(--text-dim);
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
#file-preview-remove {
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 1.2rem;
  cursor: pointer;
  padding: 0.2rem 0.5rem;
}
#file-preview-remove:hover { color: var(--text); }

#image-params-bar {
  display: none;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
  padding: 0.55rem 1rem;
  background: var(--surface);
  border-top: 1px solid var(--surface2);
}
#image-params-bar.active { display: flex; }
.image-param-field {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--text-dim);
  font-size: 0.78rem;
}
.image-param-field select,
.image-param-field input[type="number"] {
  height: 32px;
  padding: 0.25rem 0.45rem;
  border: 1px solid var(--surface2);
  border-radius: 6px;
  background: var(--bg);
  color: var(--text);
  font: inherit;
}
.image-param-field input[type="number"] { width: 110px; }
.image-param-check {
  cursor: pointer;
  user-select: none;
}
.image-param-hint {
  margin-left: auto;
  color: var(--text-dim);
  font-size: 0.75rem;
}

.image-brief-card {
  display: grid;
  gap: 0.65rem;
}
.image-brief-card h3 {
  margin: 0;
  font-size: 0.95rem;
}
.image-brief-text {
  white-space: pre-wrap;
  color: var(--text);
}
.image-brief-actions {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}
.image-brief-actions button {
  border: 1px solid var(--surface2);
  border-radius: 6px;
  padding: 0.45rem 0.75rem;
  background: var(--bg);
  color: var(--text);
  cursor: pointer;
}
.image-brief-actions .primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.image-brief-actions button:disabled { opacity: 0.55; cursor: not-allowed; }
.file-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  background: var(--bg);
  border: 1px solid var(--surface2);
  border-radius: 6px;
  padding: 0.25rem 0.6rem;
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-bottom: 0.4rem;
}
.file-badge-icon { font-size: 1rem; }

#send-btn {
  padding: 0.7rem 1.2rem;
  background: var(--accent);
  color: #FFFFFF;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-size: 1rem;
  font-weight: 600;
  min-height: 44px;
}

#send-btn:disabled { opacity: 0.5; cursor: not-allowed; }
#send-btn.stop { background: var(--destructive); }
#send-btn.stop:hover { background: var(--destructive); opacity: 0.9; }

/* --- Mobile --- */
@media (max-width: 700px) {
  #sidebar {
    position: fixed;
    left: -100%;
    top: 0;
    height: 100%;
    z-index: 100;
    transition: left 0.2s ease;
  }
  #sidebar.open { left: 0; }
  #sidebar-toggle { display: block; }
  .message { max-width: 90%; }
}

/* --- Assessment wizard --- */
#assessment-overlay {
  display: none;
  position: absolute;
  inset: 0;
  background: var(--bg);
  z-index: 50;
  flex-direction: column;
  overflow: hidden;
}
#assessment-overlay.active { display: flex; }
.assess-header {
  padding: 0.8rem 1.2rem;
  background: var(--surface);
  border-bottom: 1px solid var(--surface2);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.assess-header h2 { font-size: 1rem; font-weight: 600; }
.assess-close {
  background: none; border: none; font-size: 1.4rem;
  cursor: pointer; color: var(--text-dim); padding: 0 0.3rem;
}
.assess-close:hover { color: var(--text); }
.assess-progress { height: 4px; background: var(--surface2); }
.assess-progress-bar {
  height: 100%; background: var(--accent);
  transition: width 0.3s ease; width: 0;
}
.assess-body {
  flex: 1; overflow-y: auto; padding: 1.5rem;
  display: flex; flex-direction: column; align-items: center;
}
.assess-content { max-width: 600px; width: 100%; }
.assess-step-label { font-size: 0.8rem; color: var(--text-dim); margin-bottom: 0.5rem; }
.assess-situation {
  background: var(--surface); border: 1px solid var(--surface2);
  border-radius: var(--radius); padding: 1rem 1.2rem;
  margin-bottom: 1.5rem; line-height: 1.6; font-size: 0.95rem;
}
.assess-situation-title {
  font-weight: 600; margin-bottom: 0.5rem; color: var(--accent);
}
.assess-question { margin-bottom: 1.2rem; }
.assess-question-text {
  font-size: 0.9rem; margin-bottom: 0.6rem; line-height: 1.4;
}
.likert-group { display: flex; gap: 0.5rem; justify-content: center; }
.likert-btn {
  width: 44px; height: 44px; border: 2px solid var(--surface2);
  border-radius: 50%; background: var(--surface); cursor: pointer;
  font-size: 0.9rem; font-weight: 600; color: var(--text-dim);
  transition: all 0.15s;
}
.likert-btn:hover { border-color: var(--accent); color: var(--accent); }
.likert-btn.selected {
  background: var(--accent); border-color: var(--accent); color: #fff;
}
.likert-labels {
  display: flex; justify-content: space-between;
  font-size: 0.7rem; color: var(--text-dim);
  margin-top: 0.3rem; padding: 0 0.2rem;
}
.assess-nav {
  padding: 0.8rem 1.2rem; background: var(--surface);
  border-top: 1px solid var(--surface2);
  display: flex; justify-content: space-between; gap: 0.5rem;
}
.assess-nav button {
  padding: 0.6rem 1.2rem; border: none; border-radius: 8px;
  cursor: pointer; font-size: 0.9rem; font-weight: 600;
}
#assess-prev { background: var(--surface2); color: var(--text-dim); }
#assess-next { background: var(--accent); color: #fff; }
#assess-next:disabled { opacity: 0.5; cursor: not-allowed; }
.assess-intro { text-align: center; padding: 2rem 0; }
.assess-intro h2 { font-size: 1.3rem; margin-bottom: 1rem; }
.assess-intro p {
  color: var(--text-dim); line-height: 1.6;
  margin-bottom: 0.5rem; font-size: 0.95rem;
}
.assess-start-btn {
  margin-top: 1.5rem; padding: 0.8rem 2rem;
  background: var(--accent); color: #fff; border: none;
  border-radius: 8px; font-size: 1rem; font-weight: 600; cursor: pointer;
}
.assess-scores-grid {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 0.8rem; margin: 1rem 0;
}
.assess-score-card {
  background: var(--surface); border: 1px solid var(--surface2);
  border-radius: 8px; padding: 0.8rem;
}
.assess-score-label { font-size: 0.8rem; color: var(--text-dim); margin-bottom: 0.3rem; }
.assess-score-bar {
  height: 6px; background: var(--surface2);
  border-radius: 3px; margin-top: 0.4rem;
}
.assess-score-fill {
  height: 100%; background: var(--accent);
  border-radius: 3px; transition: width 0.5s ease;
}
.assess-score-value { font-size: 1.1rem; font-weight: 600; }
.assess-loading { text-align: center; padding: 3rem 0; color: var(--text-dim); }
.assess-results { line-height: 1.6; }
.assess-close-results {
  margin-top: 1.5rem; padding: 0.7rem 1.5rem;
  background: var(--accent); color: #fff; border: none;
  border-radius: 8px; font-size: 0.95rem; font-weight: 600;
  cursor: pointer; display: block; margin-left: auto; margin-right: auto;
}
/* Image generation styles */
.image-loading { color: var(--text-secondary); font-style: italic; padding: 1rem 0; }
.generated-image-container { max-width: 512px; margin: 0.5rem 0; }
.generated-image { width: 100%; border-radius: 8px; display: block; }
.generated-image-link {
  display: block;
  cursor: pointer;
  line-height: 0;
}
.generated-image-link:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 8px;
}
.image-actions { margin-top: 0.5rem; display: flex; gap: 0.5rem; flex-wrap: wrap; }
.image-download-btn {
  background: var(--accent); color: #fff; border: none; padding: 0.4rem 0.8rem;
  border-radius: 6px; cursor: pointer; font-size: 0.85rem;
}
.image-vary-btn {
  background: var(--bg); color: var(--text); border: 1px solid var(--border); padding: 0.4rem 0.8rem;
  border-radius: 6px; cursor: pointer; font-size: 0.85rem;
}
.image-delete-btn {
  background: transparent; color: var(--text-secondary); border: 1px solid var(--border); padding: 0.4rem 0.8rem;
  border-radius: 6px; cursor: pointer; font-size: 0.85rem;
}
.image-download-btn:hover, .image-vary-btn:hover { opacity: 0.85; }
.image-delete-btn:hover { color: var(--destructive); border-color: var(--destructive); }
.image-revised-prompt { font-size: 0.8rem; color: var(--text-secondary); margin-top: 0.4rem; font-style: italic; }
.image-error { color: var(--destructive); font-size: 0.85rem; padding: 0.75rem 0; }

/* --- Design system refinements --- */
.login-box { border: 1px solid var(--border); box-shadow: var(--shadow-sm); }
.login-box input, #prompt-select, #model-select, #input-area textarea, #search-conversations {
  border-color: var(--input);
  background: var(--surface-muted);
  color: var(--text);
}
.login-box button:hover, #new-chat-btn:hover, #send-btn:hover:not(:disabled), .assess-start-btn:hover, #assess-next:hover:not(:disabled), .assess-close-results:hover, .image-download-btn:hover { background: var(--primary-hover); opacity: 1; }
.login-box button, #new-chat-btn, #send-btn, .assess-start-btn, #assess-next, .assess-close-results, .image-download-btn { color: var(--primary-foreground); }
.login-error { color: var(--destructive); }
#sidebar, #sidebar-header, header, #input-area, #file-preview-bar, .assess-header, .assess-nav { border-color: var(--border); }
#new-chat-btn, #send-btn { display: inline-flex; align-items: center; justify-content: center; gap: 0.4rem; }
#logout-btn { flex: 0 0 auto; padding: 0.5rem; }
#sidebar-toggle { padding: 0.2rem; }
#search-conversations:focus, #prompt-select:focus, #model-select:focus, #input-area textarea:focus { border-color: var(--ring); }
#search-conversations::placeholder { color: var(--text-dim); }
.conv-item:hover { background: var(--surface-muted); }
.conv-item.active { background: var(--primary-muted); }
.conv-item-btn { border-radius: var(--radius-sm); display: inline-flex; align-items: center; justify-content: center; padding: 0.2rem; }
.conv-item-btn:hover { background: var(--surface); }
.conv-item-btn.export:hover { color: var(--success); }
.conv-group-label, .conv-empty {
  padding: 0.45rem 0.65rem 0.25rem;
  color: var(--text-dim);
  font-size: var(--text-xs);
  line-height: 1.4;
}
.conv-group-label { font-weight: 600; text-transform: uppercase; letter-spacing: 0.04em; }
.message { max-width: min(80%, 720px); border-radius: var(--radius-lg); font-size: var(--text-md); box-shadow: var(--shadow-sm); }
.message.user { border-bottom-right-radius: var(--radius-sm); }
.message.assistant { border-color: var(--border); border-bottom-left-radius: var(--radius-sm); line-height: var(--leading-relaxed); max-width: min(85%, 760px); }
.message.assistant code { background: var(--code-inline-bg); color: var(--code-inline-fg); font-family: var(--font-mono); }
.message.assistant pre { background: var(--code-bg); color: var(--code-fg); }
.message.assistant th, .message.assistant td { border-color: var(--border); }
.message.assistant th { background: var(--surface-muted); }
.code-block { overflow: hidden; border-radius: var(--radius); background: var(--code-bg); margin: 0.7em 0; border: 1px solid rgba(148, 163, 184, 0.18); }
.code-block-header { display: flex; justify-content: space-between; align-items: center; gap: 0.75rem; padding: 0.45rem 0.7rem; background: rgba(255,255,255,0.06); color: #CBD5E1; font-family: var(--font-mono); font-size: var(--text-xs); }
.message.assistant .code-block pre { margin: 0; border-radius: 0; }
.code-block-actions { display: inline-flex; align-items: center; gap: 0.35rem; flex-wrap: wrap; justify-content: flex-end; }
.code-copy-btn, .code-view-svg-btn { border: none; background: transparent; color: #CBD5E1; cursor: pointer; border-radius: var(--radius-sm); padding: 0.2rem 0.35rem; display: inline-flex; align-items: center; gap: 0.25rem; font-size: var(--text-xs); }
.code-copy-btn:hover, .code-view-svg-btn:hover { background: rgba(255,255,255,0.10); color: var(--code-fg); }
.code-copy-btn.copied { color: var(--success); }
.svg-preview { background: var(--surface); border-top: 1px solid rgba(148, 163, 184, 0.18); padding: 0.75rem; display: grid; place-items: center; }
.svg-preview svg { max-width: 100%; max-height: 420px; height: auto; }
.usage-info { margin: 0 auto; padding: 0.15rem 0.4rem; max-width: 760px; }
.usage-info summary { cursor: pointer; list-style: none; }
.usage-info summary::-webkit-details-marker { display: none; }
.empty-state { align-self: center; width: min(680px, 100%); margin: auto; padding: 1.5rem; color: var(--text-dim); text-align: center; }
.empty-state h2 { color: var(--text); font-size: var(--text-lg); margin-bottom: 0.45rem; }
.empty-state p { margin-bottom: 1rem; line-height: 1.5; }
.suggestion-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 0.5rem; }
.suggestion-chip { border: 1px solid var(--border); background: var(--surface); color: var(--foreground-soft); border-radius: var(--radius); padding: 0.7rem 0.8rem; cursor: pointer; text-align: left; font-size: var(--text-sm); line-height: 1.35; }
.suggestion-chip:hover { border-color: var(--ring); color: var(--text); background: var(--surface-muted); }
#input-area { position: relative; }
#file-btn { background: var(--surface); border-color: var(--border); color: var(--text-dim); }
#file-btn.has-file { border-color: var(--accent); background: var(--primary-muted); color: var(--accent); }
#command-palette { position: absolute; left: 4.2rem; bottom: calc(100% - 0.2rem); width: min(380px, calc(100vw - 2rem)); background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); padding: 0.35rem; z-index: 40; }
#command-palette[hidden] { display: none; }
.command-option { width: 100%; border: none; background: transparent; color: var(--text); display: flex; align-items: flex-start; gap: 0.65rem; padding: 0.6rem; border-radius: var(--radius-sm); cursor: pointer; text-align: left; }
.command-option:hover, .command-option.active { background: var(--surface-muted); }
.command-option-icon { color: var(--accent); padding-top: 0.1rem; }
.command-option strong { display: block; font-size: var(--text-sm); }
.command-option span { display: block; color: var(--text-dim); font-size: var(--text-xs); line-height: 1.35; margin-top: 0.1rem; }
#assessment-overlay { position: fixed; z-index: 200; }
.assess-situation, .assess-score-card, .file-badge { border-color: var(--border); }
.likert-btn { border-color: var(--border); }
#assess-prev { background: var(--surface-muted); }
.toast { position: fixed; left: 50%; bottom: 1rem; transform: translateX(-50%); background: var(--surface); color: var(--text); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); padding: 0.65rem 0.8rem; display: inline-flex; align-items: center; gap: 0.75rem; z-index: 300; font-size: var(--text-sm); }
.toast button { border: none; background: transparent; color: var(--accent); font-weight: 600; cursor: pointer; }

/* --- Atelier editorial layer --- */
:root {
  --background: #F7F7F4;
  --foreground: #1D2430;
  --surface: #FFFFFF;
  --surface-muted: #EFEFEA;
  --muted: #E3E1DA;
  --muted-strong: #C9C5BA;
  --muted-foreground: #6C6F75;
  --foreground-soft: #3B4554;
  --primary: #295BDB;
  --primary-hover: #2149B4;
  --primary-muted: #EAF0FF;
  --success: #1F7A4D;
  --border: #D8D5CC;
  --input: #CFCBC1;
  --ring: #295BDB;
  --shadow-sm: none;
  --shadow: 0 10px 24px rgba(29, 36, 48, 0.10);
  --text-base: 0.875rem;
  --text-md: 0.9375rem;
  --text-lg: 1.05rem;
  --radius-sm: 2px;
  --radius: 4px;
  --radius-lg: 6px;
}

[data-theme="dark"] {
  --background: #101214;
  --foreground: #F3F1EA;
  --surface: #171A1F;
  --surface-muted: #20242B;
  --muted: #2A2E36;
  --muted-strong: #3D434D;
  --muted-foreground: #A6A299;
  --foreground-soft: #D7D2C6;
  --primary: #8FAEFF;
  --primary-hover: #B3C7FF;
  --primary-muted: rgba(143, 174, 255, 0.14);
  --success: #74C69D;
  --border: #30343B;
  --input: #464B55;
  --ring: #8FAEFF;
}

body { letter-spacing: 0; }

.login-box { border-radius: var(--radius-lg); text-align: left; }
.login-box h1 { font-size: 1.35rem; letter-spacing: 0; }
.login-box button,
.login-box input,
#sidebar-header button,
#search-conversations,
#input-area textarea,
#file-btn,
#send-btn { border-radius: var(--radius); }

header {
  padding: 0.6rem 0.8rem;
  min-height: 72px;
  gap: 0.65rem;
  align-items: stretch;
}

.brand-lockup {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-width: 112px;
}

.brand-lockup h1 {
  font-size: 0.98rem;
  font-weight: 700;
  line-height: 1.15;
}

#conversation-context {
  color: var(--text-dim);
  font-size: var(--text-xs);
  line-height: 1.2;
  margin-top: 0.15rem;
}

.atelier-controls {
  display: grid;
  grid-template-columns: minmax(170px, 240px) minmax(170px, 260px);
  gap: 0.5rem;
  flex: 1;
  min-width: 0;
  align-items: stretch;
}

.atelier-control {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  grid-template-rows: auto auto;
  column-gap: 0.55rem;
  row-gap: 0.18rem;
  align-content: center;
  min-width: 0;
  padding: 0.45rem 0.55rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface-muted);
}

.atelier-control.is-hidden { display: none; }

.control-kicker {
  color: var(--text-dim);
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  align-self: center;
}

#prompt-select,
#model-select {
  grid-column: 2;
  width: 100%;
  min-width: 0;
  margin: 0;
  padding: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
  color: var(--text);
  font-size: 0.86rem;
  font-weight: 650;
}

#prompt-select:focus,
#model-select:focus { outline: none; }

.control-summary {
  grid-column: 1 / -1;
  color: var(--text-dim);
  font-size: 0.72rem;
  line-height: 1.25;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.usage-summary {
  align-self: center;
  max-width: 150px;
  overflow: hidden;
  text-overflow: ellipsis;
}

.share-control,
#theme-toggle,
#user-name { align-self: center; }

#user-name {
  margin-left: 0;
  padding: 0 0.25rem;
  max-width: 96px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.assistant-brief {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(180px, 0.8fr) auto;
  gap: 0.8rem;
  align-items: center;
  padding: 0.65rem 1rem;
  border-bottom: 1px solid var(--border);
  background: var(--background);
}

.assistant-brief-main {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  min-width: 0;
}

.assistant-brief-icon {
  width: 32px;
  height: 32px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--primary);
}

.assistant-brief-label {
  font-size: var(--text-sm);
  font-weight: 700;
  line-height: 1.2;
}

.assistant-brief p,
.assistant-brief-method p {
  margin: 0;
  color: var(--text-dim);
  font-size: var(--text-xs);
  line-height: 1.35;
}

.assistant-scope-note {
  margin-top: 0.25rem !important;
  color: var(--foreground-soft) !important;
  font-weight: 500;
}

.assistant-brief-method span {
  display: block;
  margin-bottom: 0.1rem;
  color: var(--foreground-soft);
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.assistant-principles {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.35rem;
}

.assistant-principles span {
  padding: 0.18rem 0.42rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--foreground-soft);
  font-size: 0.7rem;
  line-height: 1.2;
}

.assistant-brief.image-mode .assistant-brief-icon { color: #A15C00; }

#messages {
  padding: 1.1rem min(5vw, 3rem);
  gap: 0.65rem;
}

.message {
  box-shadow: none;
  font-size: var(--text-base);
  border-radius: var(--radius-lg);
}

.message.user {
  max-width: min(72%, 620px);
  border: 1px solid #CAD8FF;
  border-bottom-right-radius: var(--radius-sm);
}

.message.assistant {
  max-width: min(92%, 820px);
  padding: 1rem 0;
  border: 0;
  border-radius: 0;
  background: transparent;
  line-height: 1.62;
}

.message.assistant + .message.assistant { border-top: 1px solid var(--border); }

.message.assistant h1,
.message.assistant h2,
.message.assistant h3 { letter-spacing: 0; }

.message.assistant pre,
.code-block { border-radius: var(--radius); }

.empty-state {
  text-align: left;
  width: min(760px, 100%);
  padding: 1.25rem 0;
}

.empty-state h2 { font-size: 1.15rem; }
.suggestion-grid { grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); }
.suggestion-chip { border-radius: var(--radius); background: var(--surface); }

#image-params-bar {
  padding: 0.55rem 1rem;
  background: var(--surface);
}

.image-param-hint { max-width: 260px; line-height: 1.3; }

#input-area {
  padding: 0.7rem 1rem;
  gap: 0.45rem;
}

#input-area textarea {
  min-height: 40px;
  padding: 0.62rem 0.75rem;
  font-size: var(--text-base);
}

#file-btn,
#send-btn,
.icon-btn {
  min-height: 40px;
  min-width: 40px;
}

#send-btn {
  padding: 0.62rem 0.9rem;
  font-size: var(--text-sm);
}

.share-btn { border-radius: var(--radius); background: var(--surface); }
.share-panel { border-radius: var(--radius); }

@media (max-width: 980px) {
  header {
    min-height: auto;
    flex-wrap: wrap;
  }
  .brand-lockup { flex: 1 1 auto; }
  .atelier-controls {
    order: 2;
    flex-basis: 100%;
    grid-template-columns: 1fr 1fr;
  }
  .assistant-brief {
    grid-template-columns: 1fr;
    align-items: start;
    gap: 0.55rem;
  }
  .assistant-principles { justify-content: flex-start; }
}

@media (max-width: 700px) {
  header { padding: 0.55rem; gap: 0.45rem; }
  .brand-lockup h1 { font-size: 0.95rem; }
  #conversation-context { display: none; }
  .atelier-controls { grid-template-columns: 1fr; }
  .atelier-control { padding: 0.42rem 0.5rem; }
  .control-summary { white-space: normal; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; }
  .usage-summary { display: none; }
  .share-btn span, .send-label { display: none; }
  #user-name { display: none; }
  .assistant-brief { padding: 0.6rem 0.75rem; }
  .assistant-brief-method { display: none; }
  .assistant-principles { display: none; }
  #messages { padding: 0.8rem; }
  .message.user { max-width: 88%; }
  .message.assistant { max-width: 100%; }
  #image-params-bar { align-items: flex-start; gap: 0.45rem; }
  .image-param-hint { flex-basis: 100%; margin-left: 0; }
  #input-area { padding: 0.55rem; }
  #command-palette { left: 0.55rem; bottom: calc(100% + 0.25rem); }
}