body {
  margin: 0;
  min-height: 100dvh;
  background:
    radial-gradient(circle at top left, rgba(238, 247, 241, 0.9), transparent 34%),
    linear-gradient(180deg, #fbf9f4 0%, #f5f0e7 100%);
  color: #18222b;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

a {
  color: inherit;
}

button,
input,
textarea {
  font: inherit;
}

.ai-mobile-shell {
  max-width: 768px;
  margin: 0 auto;
  padding: 18px 14px calc(104px + env(safe-area-inset-bottom));
}

.ai-mobile-hero {
  position: relative;
  overflow: hidden;
  margin-bottom: 14px;
  padding: 20px;
  border: 1px solid rgba(219, 206, 186, 0.95);
  border-radius: 28px;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.92), rgba(247, 243, 234, 0.96));
  box-shadow: 0 18px 40px rgba(24, 34, 43, 0.08);
}

.ai-mobile-hero::after {
  content: "";
  position: absolute;
  inset: auto -28px -38px auto;
  width: 150px;
  height: 150px;
  border-radius: 999px;
  background: radial-gradient(circle, rgba(69, 101, 84, 0.22), transparent 68%);
}

.ai-mobile-kicker {
  margin: 0;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: #6b675f;
}

.ai-mobile-hero h1 {
  margin: 10px 0 0;
  max-width: 12ch;
  font-size: 2rem;
  line-height: 1.02;
}

.ai-mobile-hero-copy {
  margin: 10px 0 0;
  max-width: 36rem;
  color: #5d615d;
  font-size: 0.96rem;
  line-height: 1.7;
}

.ai-mobile-hero-meta {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-top: 18px;
}

.ai-mobile-hero-meta div {
  padding: 12px 12px 11px;
  border: 1px solid rgba(224, 215, 201, 0.9);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.8);
}

.ai-mobile-hero-meta strong,
.ai-mobile-hero-meta span {
  display: block;
}

.ai-mobile-hero-meta strong {
  font-size: 0.9rem;
}

.ai-mobile-hero-meta span {
  margin-top: 4px;
  color: #756f64;
  font-size: 0.76rem;
  line-height: 1.45;
}

.ai-mobile-layout {
  display: grid;
  gap: 14px;
}

.ai-mobile-card {
  border: 1px solid #e6dfd2;
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.94);
  box-shadow: 0 12px 28px rgba(24, 34, 43, 0.06);
}

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

.ai-mobile-card-head h2,
.ai-mobile-card-head h3,
.ai-atelier-section-head h3,
.ai-atelier-results-head h3 {
  margin: 0;
  font-size: 1.02rem;
  font-weight: 800;
}

.ai-mobile-card-head p,
.ai-atelier-section-head span {
  margin: 0;
  color: #7a7468;
  font-size: 0.76rem;
}

.ai-mobile-tips {
  padding: 16px;
}

.ai-mobile-chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

.ai-mobile-chip {
  min-height: 40px;
  padding: 0 14px;
  border: 1px solid #d8cfbf;
  border-radius: 999px;
  background: #f8f4eb;
  color: #2c3c35;
  font-size: 0.84rem;
  font-weight: 700;
}

.ai-atelier {
  padding: 14px;
}

.ai-atelier-grid {
  display: grid;
  gap: 12px;
}

.ai-atelier-workspace,
.ai-atelier-results {
  padding: 14px;
  border: 1px solid #ece5d8;
  border-radius: 20px;
  background: #fffefb;
}

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

.ai-mode-tabs,
.ai-result-tabs {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  margin-bottom: 12px;
}

.ai-mode-tab,
.ai-result-tab,
.btn-primary,
.btn-secondary,
.ai-secondary-btn,
.ai-amber-btn {
  min-height: 46px;
  border-radius: 999px;
  border: 1px solid transparent;
  padding: 0 14px;
  font-size: 0.88rem;
  font-weight: 800;
}

.ai-mode-tab,
.ai-result-tab {
  background: #f7f2e8;
  border-color: #ddd2bf;
  color: #3a463d;
}

.ai-mode-tab.is-active,
.ai-result-tab.is-active,
.btn-primary {
  background: #1b3d2f;
  border-color: #1b3d2f;
  color: #fff;
}

.btn-secondary,
.ai-secondary-btn {
  background: #f5efe3;
  border-color: #d8cfbd;
  color: #2c3c35;
}

.ai-amber-btn {
  background: #8a6100;
  color: #fff;
}

.ai-input-pane textarea,
.ai-hidden-input {
  width: 100%;
  box-sizing: border-box;
  border: 1px solid #d9d3c8;
  border-radius: 16px;
  background: #fff;
  padding: 13px 14px;
  color: #18222b;
}

.ai-input-pane textarea {
  min-height: 148px;
  line-height: 1.7;
  resize: vertical;
}

.ai-atelier-input-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-top: 10px;
}

.ai-atelier-input-meta span {
  color: #7a7468;
  font-size: 0.76rem;
}

.ai-image-dropzone {
  padding: 18px;
  border: 1px dashed #d2c8b7;
  border-radius: 18px;
  background: #fcf8ef;
  text-align: center;
}

.ai-image-dropzone-icon {
  font-size: 1.5rem;
}

.ai-image-dropzone p {
  margin: 8px 0 6px;
  font-size: 1rem;
  font-weight: 800;
}

.ai-image-dropzone span {
  display: block;
  color: #70695f;
  font-size: 0.84rem;
  line-height: 1.6;
}

.ai-result-panel {
  display: none;
}

.ai-result-panel.is-active {
  display: block;
}

.result-area,
.ai-atelier-placeholder {
  border: 1px solid #e7dfd1;
  border-radius: 18px;
  background: #fffdfa;
  padding: 14px;
}

.result-area {
  min-height: 140px;
}

.ai-result-block {
  font-size: 0.93rem;
  line-height: 1.75;
}

.ai-result-block h3,
.ai-result-block h4,
.ai-result-block p,
.ai-result-block ul,
.ai-result-block ol {
  margin-top: 0;
}

.ai-result-block ul,
.assistant-grammar-list {
  padding-left: 18px;
}

.ai-result-block li,
.assistant-grammar-list li {
  margin-bottom: 6px;
}

.ai-atelier-placeholder--image,
.ai-atelier-placeholder--text {
  background: #fbf8f2;
}

.ai-atelier-note-head {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 6px;
}

.ai-atelier-note-head h4 {
  margin: 0;
  font-size: 0.94rem;
}

.ai-atelier-note p,
.ai-atelier-placeholder p {
  margin: 0;
  color: #5f665f;
  line-height: 1.7;
}

.ai-sub-kicker {
  margin: 0 0 8px;
  color: #7a7468;
  font-size: 0.74rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.ai-atelier-result-actions {
  display: inline-flex;
  gap: 8px;
}

.ai-atelier-result-actions button {
  width: 40px;
  height: 40px;
  border: 1px solid #ddd4c5;
  border-radius: 999px;
  background: #f8f4eb;
  color: #39453f;
}

.assist-history-chip,
.assistant-action-btn,
.assistant-grammar-btn,
.play-btn,
.trans-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  margin: 4px 6px 4px 0;
}

.assist-card,
.assistant-dialog-content,
.assistant-grammar-result,
.assistant-grammar-panel {
  margin-top: 12px;
}

.assistant-dialog-row {
  display: flex;
  margin-bottom: 12px;
}

.assistant-dialog-row.is-right {
  justify-content: flex-end;
}

.assistant-dialog-bubble {
  width: min(100%, 30rem);
  padding: 12px;
  border-radius: 18px;
  border: 1px solid #e1d9ca;
  background: #fff;
}

.assistant-dialog-bubble.is-right {
  background: #f0f5f1;
}

.assistant-dialog-head,
.assistant-dialog-header-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 8px;
}

.assistant-dialog-speaker {
  color: #456554;
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.assistant-dialog-tools {
  display: inline-flex;
  gap: 6px;
}

.assistant-dialog-icon-btn {
  min-width: 38px;
  min-height: 38px;
  padding: 0 10px;
}

.assistant-dialog-hu {
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.6;
}

.assistant-dialog-zh,
.assistant-grammar-text,
.assistant-grammar-tip,
.assistant-grammar-loading,
.assistant-grammar-error {
  color: #566058;
  line-height: 1.7;
}

.assistant-grammar-block {
  margin-top: 10px;
}

.assistant-grammar-panel {
  padding-top: 10px;
  border-top: 1px dashed #ddd2bf;
}

.assistant-grammar-error {
  color: #8f372d;
}

.ai-hidden-input {
  display: none;
}

@media (min-width: 760px) {
  .ai-mobile-shell {
    padding-top: 24px;
  }

  .ai-atelier-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  }
}

@media (max-width: 560px) {
  .ai-mobile-hero h1 {
    font-size: 1.72rem;
  }

  .ai-mobile-hero-meta {
    grid-template-columns: 1fr;
  }

  .ai-atelier-input-meta {
    flex-direction: column;
    align-items: stretch;
  }
}