:root {
  --paper: #f3ecda;
  --paper-deep: #eae0c8;
  --paper-insert: #fbf7ec;
  --ink: #22201b;
  --ink-soft: #6b6152;
  --seal: #af3327;
  --seal-deep: #7c2019;
  --seal-tint: #efd9d2;
  --jade: #3c6e5c;
  --jade-deep: #2a4d40;
  --jade-tint: #e1e9e2;
  --line: #d9cca8;
  --radius: 10px;
  --radius-lg: 18px;
  --radius-pill: 999px;

  --font-display: "Songti SC", "STSong", "SimSun", serif;
  --font-body: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-accent: Georgia, "Songti SC", serif;
  --font-mono: ui-monospace, "SF Mono", Menlo, Consolas, "Courier New", monospace;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  min-height: 100%;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
}

body {
  background-image:
    linear-gradient(rgba(217, 204, 168, 0.4) 1px, transparent 1px),
    linear-gradient(90deg, rgba(217, 204, 168, 0.4) 1px, transparent 1px);
  background-size: 30px 30px;
}

a { color: inherit; }

/* ---------------------------------------------------------------- */
/* top nav                                                            */
/* ---------------------------------------------------------------- */

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(243, 236, 218, 0.92);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--line);
}

.topbar-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.seal-mark { flex-shrink: 0; display: block; }

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.3;
}

.brand-text strong {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: 0.02em;
}

.brand-text small {
  font-family: var(--font-accent);
  font-style: italic;
  font-size: 12px;
  color: var(--ink-soft);
}

.tab-nav {
  display: flex;
  gap: 28px;
}

.tab-link {
  position: relative;
  font-size: 15px;
  font-weight: 600;
  color: var(--ink-soft);
  text-decoration: none;
  padding: 6px 2px 12px;
  border-bottom: 3px solid transparent;
  transition: color 0.15s ease, border-color 0.15s ease;
  white-space: nowrap;
}

.tab-link:hover { color: var(--ink); border-color: var(--line); }

.tab-link.is-active {
  color: var(--ink);
  border-color: var(--seal);
}

/* ---------------------------------------------------------------- */
/* layout                                                              */
/* ---------------------------------------------------------------- */

.layout {
  max-width: 1180px;
  margin: 34px auto 90px;
  padding: 0 24px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 24px;
  align-items: start;
}

.sheet {
  background: var(--paper-insert);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
}

.panel-form { padding: 30px 32px 28px; }

.page-head h1 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 26px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--ink);
}

.page-head p {
  margin: 0 0 24px;
  color: var(--ink-soft);
  font-size: 14.5px;
  line-height: 1.65;
  max-width: 64ch;
}

.hr {
  border: none;
  border-top: 1px solid var(--line);
  margin: 24px 0;
}

/* ---------------------------------------------------------------- */
/* form fields                                                        */
/* ---------------------------------------------------------------- */

.field-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-bottom: 6px;
}

.field { display: flex; flex-direction: column; gap: 6px; }
.field-wide { grid-column: span 3; }

.field span {
  font-size: 12.5px;
  font-weight: 600;
  color: var(--jade-deep);
  letter-spacing: 0.01em;
}

.field input,
.field textarea {
  font: inherit;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 10px 12px;
  background: #fff;
  color: var(--ink);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.field input:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--seal);
  box-shadow: 0 0 0 3px rgba(175, 51, 39, 0.12);
}

.field-textarea textarea {
  resize: vertical;
  min-height: 260px;
  line-height: 1.65;
  font-size: 13.5px;
}

.meta-disclosure {
  margin-bottom: 20px;
}

.meta-disclosure summary {
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
  color: var(--jade-deep);
  padding: 8px 0;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 6px;
}

.meta-disclosure summary::-webkit-details-marker { display: none; }
.meta-disclosure summary::before {
  content: "▸";
  font-size: 11px;
  transition: transform 0.15s ease;
}
.meta-disclosure[open] summary::before { transform: rotate(90deg); }

.meta-disclosure .field-grid { margin-top: 12px; }

.meta-summary {
  font-size: 12.5px;
  color: var(--ink-soft);
}

.meta-summary strong { color: var(--ink); font-weight: 600; }

/* ---------------------------------------------------------------- */
/* buttons                                                            */
/* ---------------------------------------------------------------- */

.btn {
  font: inherit;
  font-weight: 600;
  font-size: 14px;
  padding: 11px 22px;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 9px;
  transition: transform 0.08s ease, background 0.15s ease, border-color 0.15s ease;
}

.btn:active { transform: scale(0.97); }

.btn-primary {
  background: var(--seal);
  color: var(--paper);
}

.btn-primary:hover { background: var(--seal-deep); }
.btn-primary:disabled { opacity: 0.55; cursor: not-allowed; transform: none; }

.btn-ghost {
  background: transparent;
  color: var(--ink-soft);
  border-color: var(--line);
}

.btn-ghost:hover { background: var(--paper-deep); color: var(--ink); }

.spinner {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 2px solid rgba(243, 236, 218, 0.5);
  border-top-color: var(--paper);
  animation: spin 0.8s linear infinite;
}

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

.actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.actions-inline { margin-top: 12px; }

/* ---------------------------------------------------------------- */
/* export row / format pills                                         */
/* ---------------------------------------------------------------- */

.export-row {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin: 20px 0 14px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.export-label {
  font-size: 12.5px;
  font-weight: 600;
  color: var(--jade-deep);
}

.format-pills { display: flex; gap: 8px; }

.format-pill {
  font: inherit;
  font-size: 13px;
  font-weight: 600;
  padding: 7px 14px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink-soft);
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.format-pill.is-active {
  background: var(--jade);
  border-color: var(--jade);
  color: var(--paper);
}

/* ---------------------------------------------------------------- */
/* status / result                                                    */
/* ---------------------------------------------------------------- */

.status-area { margin-top: 20px; }

.status-card {
  border-radius: var(--radius-lg);
  padding: 18px 20px;
  font-size: 13.5px;
  line-height: 1.6;
  border: 1px solid var(--line);
  position: relative;
}

.status-card.error {
  background: #f8ede9;
  border-color: #dcb6a9;
  color: var(--seal-deep);
}

.status-card.success {
  background: var(--jade-tint);
  border-color: #b7cabf;
  color: var(--jade-deep);
}

.status-card h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 15.5px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.status-stamp {
  width: 26px;
  height: 26px;
  flex-shrink: 0;
  animation: stampIn 0.4s cubic-bezier(0.2, 1.4, 0.4, 1);
}

@keyframes stampIn {
  0% { opacity: 0; transform: scale(1.6) rotate(-14deg); }
  100% { opacity: 1; transform: scale(1) rotate(-6deg); }
}

.status-card ul { margin: 8px 0 0; padding-left: 18px; }
.format-note { margin: 8px 0 0; }

.download-row {
  margin-top: 14px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.pdf-preview {
  margin-top: 16px;
  width: 100%;
  height: 560px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper-deep);
}

/* ---------------------------------------------------------------- */
/* chat                                                                */
/* ---------------------------------------------------------------- */

.chat-status {
  font-size: 12px;
  color: var(--ink-soft);
  margin-bottom: 12px;
  padding: 6px 12px;
  background: var(--paper-deep);
  border-radius: var(--radius-pill);
  display: inline-block;
  border: 1px solid var(--line);
}

.chat-status.is-error { background: #f8ede9; border-color: #dcb6a9; color: var(--seal-deep); }
.chat-status.is-ready { background: var(--jade-tint); border-color: #b7cabf; color: var(--jade-deep); }

.prompt-examples {
  margin: 0 0 16px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(251, 247, 236, 0.72);
}

.prompt-examples-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 10px;
}

.prompt-examples h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 15px;
  color: var(--jade-deep);
}

.prompt-examples p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 12.5px;
  line-height: 1.5;
}

.prompt-example-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 8px;
}

.prompt-example {
  font: inherit;
  text-align: left;
  color: var(--ink);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 9px 11px;
  line-height: 1.55;
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease, transform 0.08s ease;
}

.prompt-example:hover {
  background: var(--jade-tint);
  border-color: #b7cabf;
}

.prompt-example:active { transform: scale(0.99); }

.progress-steps {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 12px;
  padding: 12px 14px;
  background: var(--paper-insert);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.progress-steps[hidden] { display: none; }

.progress-meter {
  height: 8px;
  overflow: hidden;
  border-radius: var(--radius-pill);
  background: #e8e0d1;
  margin-bottom: 4px;
}

.progress-meter-bar {
  height: 100%;
  width: 0;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--jade), var(--seal));
  transition: width 260ms ease;
}

.progress-step {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--ink-soft);
}

.progress-step .dot {
  width: 15px;
  height: 15px;
  flex-shrink: 0;
  border-radius: 50%;
  border: 1.5px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
  color: var(--paper);
}

.progress-step.is-done .dot { background: var(--jade); border-color: var(--jade); }
.progress-step.is-done .dot::after { content: "✓"; }
.progress-step.is-active .dot { border-color: var(--seal); }
.progress-step.is-active .dot::after {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--seal);
  animation: pulse 1s ease-in-out infinite;
}
.progress-step.is-done { color: var(--ink); }
.progress-step.is-active { color: var(--ink); font-weight: 600; }
.progress-step .label {
  flex: 1;
  min-width: 0;
}
.progress-step .label strong {
  margin-right: 8px;
  color: var(--jade-deep);
}
.progress-step .percent {
  flex-shrink: 0;
  color: var(--ink-soft);
  font-variant-numeric: tabular-nums;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.7); }
}

.chat-window {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--paper);
  min-height: 320px;
  max-height: 480px;
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.chat-empty {
  color: var(--ink-soft);
  font-size: 13.5px;
  line-height: 1.7;
  margin: auto 0;
  text-align: center;
  padding: 20px;
  max-width: 46ch;
  margin-left: auto;
  margin-right: auto;
}

.chat-bubble {
  max-width: 86%;
  padding: 11px 15px;
  border-radius: var(--radius);
  font-size: 13.5px;
  line-height: 1.7;
  white-space: pre-wrap;
  word-break: break-word;
  border: 1px solid transparent;
}

.chat-bubble.user {
  align-self: flex-end;
  background: var(--seal-tint);
  color: var(--ink);
  border-color: #ddb8ae;
}

.chat-bubble.assistant {
  align-self: flex-start;
  background: var(--paper-insert);
  border-color: var(--line);
  color: var(--ink);
}

.markdown-result {
  white-space: normal;
  min-width: min(540px, 100%);
}

.markdown-result h3 {
  margin: 2px 0 9px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-display);
  font-size: 17px;
  color: var(--jade-deep);
}

.markdown-result h4 {
  margin: 8px 0 8px;
  font-size: 15px;
  color: var(--ink);
}

.markdown-result p {
  margin: 6px 0;
}

.markdown-result .md-gap {
  height: 8px;
}

.markdown-result .md-scene {
  color: var(--ink-soft);
  font-size: 13px;
}

.markdown-result .md-dialogue {
  display: flex;
  gap: 8px;
  align-items: baseline;
}

.markdown-result .md-dialogue strong {
  flex: 0 0 auto;
  color: var(--jade-deep);
}

.markdown-result .md-dialogue span {
  min-width: 0;
}

.markdown-result .md-link-row {
  margin-top: 8px;
}

.markdown-result a {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 6px 12px;
  border-radius: var(--radius-pill);
  background: var(--jade-tint);
  border: 1px solid #b7cabf;
  color: var(--jade-deep);
  font-weight: 600;
  text-decoration: none;
}

.markdown-result a:hover {
  background: #d6e3d8;
}

.lesson-preview {
  white-space: normal;
  min-width: min(620px, 100%);
}

.lesson-preview header {
  margin-bottom: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.lesson-preview h3 {
  margin: 0 0 4px;
  font-family: var(--font-display);
  font-size: 18px;
  color: var(--jade-deep);
}

.lesson-preview header p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 12.5px;
}

.lesson-preview section {
  margin: 12px 0;
}

.lesson-preview h4 {
  margin: 0 0 7px;
  color: var(--jade-deep);
  font-size: 14px;
}

.lesson-preview ol,
.lesson-preview ul {
  margin: 0;
  padding-left: 20px;
}

.lesson-preview li {
  margin: 4px 0;
}

.lesson-chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}

.lesson-chip {
  display: inline-flex;
  align-items: baseline;
  gap: 5px;
  padding: 5px 9px;
  border-radius: var(--radius-pill);
  background: #fff;
  border: 1px solid var(--line);
  color: var(--ink);
  font-weight: 600;
}

.lesson-chip small {
  color: var(--ink-soft);
  font-weight: 400;
}

.lesson-preview-note {
  margin: 12px 0 0;
  padding: 9px 11px;
  border-radius: var(--radius);
  background: var(--jade-tint);
  color: var(--jade-deep);
  font-size: 12.5px;
}

.chat-bubble.assistant.is-streaming::after {
  content: "▌";
  animation: blink 1s step-end infinite;
  color: var(--seal);
}

.chat-bubble.chat-error { color: var(--seal-deep); border-color: #dcb6a9; background: #f8ede9; }

@keyframes blink { 50% { opacity: 0; } }

.chat-input-row {
  margin-top: 12px;
  display: flex;
  gap: 10px;
  align-items: flex-end;
}

.chat-input-row textarea {
  flex: 1;
  font: inherit;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 10px 12px;
  background: #fff;
  resize: vertical;
  min-height: 44px;
}

.chat-input-row textarea:focus {
  outline: none;
  border-color: var(--seal);
  box-shadow: 0 0 0 3px rgba(175, 51, 39, 0.12);
}

/* ---------------------------------------------------------------- */
/* sidebar                                                             */
/* ---------------------------------------------------------------- */

.panel-help {
  padding: 26px 22px;
  position: sticky;
  top: 90px;
}

.panel-help h2 {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: 15.5px;
  color: var(--ink);
}

.tips {
  margin: 0;
  padding-left: 18px;
  color: var(--ink-soft);
  font-size: 13px;
  line-height: 1.7;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.tips-foot {
  margin: 16px 0 0;
  font-size: 12.5px;
  color: var(--jade-deep);
  background: var(--jade-tint);
  border: 1px solid #b7cabf;
  border-radius: var(--radius);
  padding: 10px 12px;
}

.history-title { margin-top: 26px; }

.history-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-height: 280px;
  overflow-y: auto;
}

.history-empty { font-size: 12.5px; color: var(--ink-soft); margin: 0; }

.history-item {
  text-align: left;
  font: inherit;
  border: 1px solid var(--line);
  background: #fff;
  border-radius: var(--radius);
  padding: 8px 10px;
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease;
}

.history-item:hover { border-color: var(--seal); background: var(--paper-insert); }

.history-item strong {
  display: block;
  font-size: 12.5px;
  color: var(--ink);
  margin-bottom: 2px;
  font-family: var(--font-mono);
}

.history-item span { font-size: 11px; color: var(--ink-soft); }

/* ---------------------------------------------------------------- */
/* misc                                                                */
/* ---------------------------------------------------------------- */

.mono { font-family: var(--font-mono); }

.site-footer {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px 40px;
  color: var(--ink-soft);
  font-size: 12px;
}

@media (max-width: 980px) {
  .layout {
    grid-template-columns: 1fr;
    max-width: 760px;
  }
  .panel-help {
    position: static;
    order: 2;
  }
  .history-list {
    max-height: none;
  }
}

@media (max-width: 640px) {
  html { -webkit-text-size-adjust: 100%; }
  body {
    background-size: 22px 22px;
  }
  .topbar {
    position: sticky;
  }
  .topbar-inner {
    padding: 10px 14px 8px;
    gap: 10px;
  }
  .seal-mark {
    width: 30px;
    height: 30px;
  }
  .brand {
    gap: 9px;
    min-width: 0;
  }
  .brand-text strong {
    font-size: 17px;
    white-space: nowrap;
  }
  .brand-text small { display: none; }
  .tab-nav {
    gap: 6px;
    margin-left: auto;
    padding: 3px;
    border: 1px solid var(--line);
    border-radius: var(--radius-pill);
    background: rgba(251, 247, 236, 0.7);
  }
  .tab-link {
    font-size: 12.5px;
    padding: 6px 10px;
    border: 0;
    border-radius: var(--radius-pill);
  }
  .tab-link:hover {
    border-color: transparent;
  }
  .tab-link.is-active {
    background: var(--seal);
    color: var(--paper);
    border-color: transparent;
  }
  .layout {
    display: flex;
    flex-direction: column;
    padding: 0 10px;
    margin: 12px auto 26px;
    gap: 12px;
  }
  .sheet {
    border-radius: 14px;
  }
  .panel-form {
    padding: 18px 14px 16px;
    width: 100%;
  }
  .page-head h1 {
    font-size: 21px;
    line-height: 1.25;
  }
  .page-head p {
    font-size: 13px;
    line-height: 1.6;
    margin-bottom: 16px;
  }
  .field-grid {
    grid-template-columns: 1fr;
    gap: 10px;
  }
  .field-wide { grid-column: span 1; }
  .field input,
  .field textarea,
  .chat-input-row textarea {
    font-size: 16px;
    padding: 11px 12px;
  }
  .field-textarea textarea {
    min-height: 280px;
    line-height: 1.6;
  }
  .actions {
    align-items: stretch;
    gap: 8px;
  }
  .actions-inline {
    display: grid;
    grid-template-columns: 1fr;
  }
  .btn {
    min-height: 44px;
    justify-content: center;
    padding: 11px 16px;
  }
  .export-row {
    align-items: stretch;
    flex-direction: column;
    gap: 9px;
    margin: 18px 0 12px;
    padding-top: 16px;
  }
  .format-pills {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 7px;
  }
  .format-pill {
    min-height: 40px;
    padding: 8px 6px;
    text-align: center;
  }
  .export-actions {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 30;
    background: rgba(243, 236, 218, 0.95);
    backdrop-filter: blur(10px);
    border-top: 1px solid var(--line);
    padding: 12px 14px calc(12px + env(safe-area-inset-bottom));
    margin: 0;
  }
  .export-actions .btn {
    width: 100%;
  }
  .status-area {
    margin-bottom: 78px;
  }
  .status-card {
    padding: 14px;
    border-radius: 14px;
  }
  .download-row .btn {
    width: 100%;
  }
  .pdf-preview {
    height: min(68vh, 520px);
  }
  .prompt-examples {
    padding: 12px;
  }
  .prompt-examples-head {
    display: block;
  }
  .prompt-examples h2 {
    margin-bottom: 4px;
  }
  .prompt-example-list {
    grid-template-columns: 1fr;
  }
  .prompt-example {
    padding: 10px 11px;
  }
  .chat-status {
    margin-bottom: 10px;
  }
  .progress-steps {
    padding: 11px;
  }
  .progress-step {
    align-items: flex-start;
    font-size: 12.5px;
  }
  .progress-step .label strong {
    display: block;
    margin: 0 0 2px;
  }
  .chat-window {
    min-height: 300px;
    max-height: 52vh;
    padding: 12px;
    border-radius: 14px;
  }
  .chat-bubble {
    max-width: 94%;
    font-size: 13.5px;
    padding: 10px 12px;
  }
  .chat-input-row {
    gap: 8px;
  }
  .chat-input-row textarea {
    min-height: 50px;
    max-height: 150px;
  }
  .chat-input-row .btn {
    flex: 0 0 72px;
    padding-left: 0;
    padding-right: 0;
  }
  .panel-help {
    padding: 18px 16px;
    order: 2;
  }
  .tips {
    font-size: 12.8px;
    gap: 8px;
  }
  .history-title {
    margin-top: 18px;
  }
  .site-footer {
    padding: 0 14px calc(86px + env(safe-area-inset-bottom));
  }
}

@media (max-width: 380px) {
  .topbar-inner {
    flex-wrap: wrap;
  }
  .tab-nav {
    width: 100%;
    margin-left: 0;
    display: grid;
    grid-template-columns: 1fr 1fr;
  }
  .format-pills {
    grid-template-columns: 1fr;
  }
  .chat-input-row {
    flex-direction: column;
    align-items: stretch;
  }
  .chat-input-row .btn {
    flex-basis: auto;
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .status-stamp, .spinner, .chat-bubble.assistant.is-streaming::after {
    animation: none !important;
  }
}