:root {
  --paper: #F2EFE9;
  --page: #FAF8F4;
  --card-inner: #EFE9DE;
  --ink: #1C1917;
  --ink-secondary: #44403C;
  --muted: #78716C;
  --line: #D8D2C5;
  --line-light: #E8E3DA;
  --accent: #A83A20;
  --accent-light: #FBEBE8;
  --accent-ink: #7C2712;
  --success: #1E6B40;
  --success-light: #EAF4EE;
  --shadow-sm: 0 2px 8px rgba(28, 25, 23, 0.04);
  --shadow-md: 0 12px 32px rgba(28, 25, 23, 0.08);
  --shadow-lg: 0 20px 48px rgba(28, 25, 23, 0.12);
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --safe-b: env(safe-area-inset-bottom, 0px);
  --safe-t: env(safe-area-inset-top, 0px);
  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}

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

[hidden] {
  display: none !important;
}

html, body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.5;
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
  min-height: 100dvh;
}

button, input, textarea, select {
  font: inherit;
  color: inherit;
  border: none;
  background: none;
}

button {
  cursor: pointer;
  user-select: none;
}

textarea {
  resize: none;
}

/* 布局主容器 */
#app {
  max-width: 44rem;
  margin: 0 auto;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  padding: calc(14px + var(--safe-t)) 18px calc(76px + var(--safe-b));
}

/* 顶部 Header */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 2px 0 16px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand-logo {
  display: block;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  flex-shrink: 0;
}

.brand-meta {
  display: flex;
  flex-direction: column;
}

.brand-title {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.brand-sub {
  font-size: 11px;
  color: var(--muted);
  letter-spacing: 0.04em;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.account-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  height: 36px;
  max-width: 132px;
  padding: 0 10px;
  border-radius: var(--radius-sm);
  color: var(--ink-secondary);
  background: var(--page);
  border: 1px solid var(--line);
  transition: all 0.15s ease;
}

.account-btn:hover {
  color: var(--ink);
  border-color: var(--ink);
}

.account-btn span {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 12px;
  font-weight: 600;
}

.account-btn.signed-in {
  color: var(--accent-ink);
  background: var(--accent-light);
  border-color: #EACEC8;
}

.icon-action-btn {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  color: var(--ink-secondary);
  background: var(--page);
  border: 1px solid var(--line);
  transition: all 0.15s ease;
}

.icon-action-btn:hover {
  color: var(--ink);
  border-color: var(--ink);
}

.badge {
  position: absolute;
  top: -4px;
  right: -4px;
  min-width: 17px;
  height: 17px;
  padding: 0 4px;
  background: var(--accent);
  color: #fff;
  font-size: 10px;
  font-weight: 700;
  border-radius: 999px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* 主工作区与 Tab 面板 */
.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.tab-panel {
  display: none;
  flex-direction: column;
  gap: 16px;
  animation: fadeIn 0.2s ease-out;
}

.tab-panel.active {
  display: flex;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(3px); }
  to { opacity: 1; transform: translateY(0); }
}

/* 核心卡片系统 */
.card {
  background: var(--page);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 16px 18px;
  box-shadow: var(--shadow-sm);
}

.practice-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.card-lead {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.step-num {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--muted);
  background: var(--card-inner);
  padding: 2px 6px;
  border-radius: 4px;
}

.step-num.step-draft {
  color: var(--accent);
  background: var(--accent-light);
}

.step-desc {
  font-size: 13px;
  font-weight: 600;
  color: var(--muted);
  flex: 1;
  margin-left: 8px;
}

.practice-block {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.practice-divider {
  height: 1px;
  background: var(--line-light);
  margin: 4px 0;
}

.draft-block {
  background: rgba(239, 233, 222, 0.45);
  border: 1px dashed var(--line);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  margin: 2px 0;
  transition: all 0.2s ease;
}

.draft-block:focus-within {
  background: var(--page);
  border-color: var(--ink);
  box-shadow: 0 0 0 1px var(--ink);
}

/* 通用胶囊按钮体系 (Pill Button System) */
.pill-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 12px;
  font-weight: 500;
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 3px 9px;
  background: var(--card-inner);
  transition: all 0.15s ease;
  cursor: pointer;
  user-select: none;
  line-height: 1.2;
}

.pill-btn:hover {
  color: var(--ink);
  border-color: var(--ink);
  background: #fff;
}

.pill-btn svg {
  flex-shrink: 0;
}

.pill-btn.recording {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
  animation: pulse 1.2s infinite;
}

.clear-pill-btn {
  font-size: 11.5px;
}

.clear-pill-btn:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.input-tools {
  display: flex;
  align-items: center;
  gap: 6px;
}

@keyframes pulse {
  0% { transform: scale(1); box-shadow: 0 0 0 0 rgba(168, 58, 32, 0.4); }
  70% { transform: scale(1.03); box-shadow: 0 0 0 8px rgba(168, 58, 32, 0); }
  100% { transform: scale(1); }
}

/* 主输入区域 */
.input-wrap {
  position: relative;
}

.main-input {
  width: 100%;
  border: 0;
  font-size: 16px;
  color: var(--ink);
  line-height: 1.6;
  padding: 4px 0;
  background: transparent;
  outline: none;
}

.main-input::placeholder {
  color: #9C9589;
  font-size: 15px;
}

/* 渐进式展开区域 */
.options-drawer {
  display: none;
  flex-direction: column;
  gap: 10px;
  padding: 12px 0 6px;
  border-top: 1px dashed var(--line);
  animation: fadeIn 0.18s ease;
}

.options-drawer.open {
  display: flex;
}

.opt-row {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.opt-row-group {
  display: flex;
  gap: 10px;
}

.opt-row.half {
  flex: 1;
}

.opt-tag {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.opt-input {
  width: 100%;
  border: 1px solid var(--line);
  background: var(--card-inner);
  border-radius: var(--radius-sm);
  padding: 7px 10px;
  font-size: 14px;
  color: var(--ink);
  outline: none;
  transition: border-color 0.15s ease;
}

.opt-input:focus {
  border-color: var(--ink);
  background: #fff;
}

.opt-input::placeholder {
  color: #A49D92;
  font-size: 13px;
}

/* 操作底部栏 */
.card-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding-top: 6px;
}

.text-toggle-btn {
  font-size: 12px;
  color: var(--muted);
  padding: 6px 2px;
  transition: color 0.15s ease;
}

.text-toggle-btn:hover {
  color: var(--ink);
}

.btn-clear {
  font-size: 13px;
  color: var(--muted);
  padding: 6px 8px;
}

.btn-clear:hover {
  color: var(--accent);
}

.action-group {
  display: flex;
  align-items: center;
  gap: 8px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  height: 38px;
  padding: 0 16px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  line-height: 1;
  transition: all 0.15s ease;
}

.btn > span {
  display: inline-flex;
  align-items: center;
  line-height: 1;
}

.btn-primary {
  background: var(--ink);
  color: var(--page);
}

.btn-primary:hover {
  background: #000;
}

.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-ghost {
  background: transparent;
  color: var(--ink-secondary);
  border: 1px solid var(--line);
}

.btn-ghost:hover {
  border-color: var(--ink);
  color: var(--ink);
}

.shortcut-kbd {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
  font-weight: 600;
  line-height: 1;
  height: 18px;
  padding: 0 5px;
  background: rgba(255, 255, 255, 0.2);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 3px;
  font-family: var(--font-sans);
  letter-spacing: 0.04em;
  color: inherit;
  box-sizing: border-box;
}

.status-tip {
  font-size: 12px;
  color: var(--muted);
  margin-top: 4px;
}

.status-tip.ok { color: var(--success); }
.status-tip.bad { color: var(--accent); }

/* 追问多轮连贯流 (Thread & Follow-up Stream) */
.result-area {
  display: flex;
  flex-direction: column;
  gap: 14px;
  animation: slideUp 0.22s ease-out;
}

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

.thread-stream {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.thread-turn {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.turn-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 0 4px;
}

.turn-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 11px;
  font-weight: 700;
  color: var(--muted);
  letter-spacing: 0.04em;
}

.turn-badge.is-followup {
  color: var(--accent-ink);
  background: var(--accent-light);
  padding: 2px 8px;
  border-radius: 4px;
}

.turn-prompt-preview {
  font-size: 12px;
  color: var(--muted);
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 65%;
}

.thread-connector {
  display: flex;
  align-items: center;
  margin: -4px 0 -4px 14px;
}

.connector-line {
  width: 2px;
  height: 14px;
  background: var(--line);
  border-radius: 1px;
}

/* 追问输入框卡片 */
.followup-card {
  background: var(--page);
  border: 1px dashed var(--line);
  border-radius: var(--radius-md);
  padding: 10px 14px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 2px;
  transition: all 0.2s ease;
}

.followup-card:focus-within {
  border-style: solid;
  border-color: var(--ink);
  box-shadow: var(--shadow-sm);
}

.followup-input-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.followup-icon {
  color: var(--muted);
  flex-shrink: 0;
}

.followup-input {
  flex: 1;
  border: none;
  background: transparent;
  font-size: 13.5px;
  color: var(--ink);
  outline: none;
  padding: 4px 0;
}

.followup-input::placeholder {
  color: #9C9589;
  font-size: 13px;
}

.btn-followup-submit {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  height: 30px;
  padding: 0 10px;
  background: var(--ink);
  color: var(--page);
  border-radius: var(--radius-sm);
  font-size: 12px;
  font-weight: 600;
  line-height: 1;
  flex-shrink: 0;
  transition: all 0.15s ease;
}

.btn-followup-submit > span {
  display: inline-flex;
  align-items: center;
  line-height: 1;
}

.btn-followup-submit:hover {
  background: #000;
}

.btn-followup-submit:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.followup-actions-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 2px;
}

.followup-hint {
  font-size: 11.5px;
  color: var(--muted);
}

.followup-status-tip {
  margin: 2px 0 0;
  font-size: 12px;
  color: var(--muted);
}

.followup-status-tip.ok { color: var(--success); }
.followup-status-tip.bad { color: var(--accent); }

/* 独立底部重置一轮按钮 */
.thread-footer-bar {
  display: flex;
  justify-content: center;
  padding: 10px 0 6px;
}

.btn-thread-reset {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--muted);
  background: var(--card-inner);
  border: 1px solid var(--line);
  padding: 7px 16px;
  border-radius: 999px;
  transition: all 0.15s ease;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
}

.btn-thread-reset:hover {
  color: var(--ink);
  background: #fff;
  border-color: var(--ink);
  transform: translateY(-1px);
}

.result-card {
  background: var(--page);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  box-shadow: var(--shadow-sm);
}

.result-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
}

.scenario-badge {
  font-size: 11px;
  font-weight: 600;
  color: var(--accent-ink);
  background: var(--accent-light);
  padding: 2px 8px;
  border-radius: 999px;
  letter-spacing: 0.05em;
}

.result-interp {
  font-size: 13px;
  color: var(--muted);
  background: var(--card-inner);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  line-height: 1.45;
}

.result-interp strong {
  color: var(--ink);
}

/* 追问解答 / 教练笔记卡片 (Coach Explanation / Q&A Box) */
.result-explanation {
  background: var(--card-inner);
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-sm);
  padding: 11px 13px;
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.explanation-head {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 11.5px;
  font-weight: 700;
  color: var(--accent-ink);
  letter-spacing: 0.04em;
}

.explanation-content {
  font-size: 13.5px;
  color: var(--ink);
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-word;
}

.explanation-content strong {
  color: var(--ink);
  font-weight: 700;
}

.natural-output-wrap {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.natural-output-lbl {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--muted);
  text-transform: uppercase;
}

.natural-sentence {
  font-family: var(--font-sans);
  font-size: 19px;
  line-height: 1.5;
  color: var(--ink);
  font-weight: 600;
  letter-spacing: -0.015em;
  white-space: pre-wrap;
  word-break: break-word;
}

.output-toolbar {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 4px;
}

.tool-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 12px;
  color: var(--muted);
  background: var(--card-inner);
  border: 1px solid var(--line);
  padding: 3px 10px;
  border-radius: 999px;
  transition: all 0.15s ease;
  user-select: none;
}

.tool-btn:hover {
  background: #fff;
  color: var(--ink);
  border-color: var(--ink);
}

.tool-btn svg {
  flex-shrink: 0;
}

/* 对照模块 (你写的 vs 地道说法) */
.contrast-box {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  background: var(--card-inner);
  padding: 12px 14px;
  border-radius: var(--radius-sm);
}

@media (min-width: 640px) {
  .contrast-box {
    grid-template-columns: 1fr 1fr;
    gap: 16px;
  }
}

.contrast-col h4 {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--muted);
  margin-bottom: 4px;
}

.contrast-col p {
  font-size: 14px;
  color: var(--ink-secondary);
}

.contrast-col.target p {
  color: var(--ink);
  font-weight: 600;
  font-family: var(--font-sans);
  font-size: 14.5px;
}

/* 盲点点评 */
.missed-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  list-style: none;
}

.missed-item {
  font-size: 13px;
  color: var(--ink-secondary);
  padding-left: 10px;
  border-left: 2px solid var(--accent);
  line-height: 1.5;
}

/* 词块列表 */
.chunks-wrap {
  display: flex;
  flex-direction: column;
  gap: 8px;
  border-top: 1px solid var(--line-light);
  padding-top: 10px;
}

.chunks-title {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.chunk-card {
  display: flex;
  flex-direction: column;
  gap: 4px;
  background: var(--card-inner);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
}

.chunk-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.chunk-phrase {
  font-family: var(--font-sans);
  font-size: 14.5px;
  font-weight: 600;
  color: var(--ink);
}

.chunk-context {
  font-size: 12.5px;
  color: var(--muted);
  line-height: 1.4;
}

.btn-speak-chunk {
  font-size: 11px;
  padding: 2px 8px;
  flex-shrink: 0;
}

/* GDC 多语种卡片结构（顺序平铺） */
.gdc-result-card {
  background: var(--page);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  box-shadow: var(--shadow-sm);
}

.gdc-boxes-wrap {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.gdc-code-box {
  background: var(--card-inner);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.gdc-code-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 12px;
  background: #E5DFD4;
  border-bottom: 1px solid var(--line);
}

.gdc-lang-title {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.copy-btn-mini {
  font-size: 11px;
  font-weight: 500;
  color: var(--muted);
  background: var(--page);
  border: 1px solid var(--line);
  padding: 2px 8px;
  border-radius: 999px;
  transition: all 0.15s ease;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 3px;
}

.copy-btn-mini:hover {
  background: #fff;
  color: var(--ink);
  border-color: var(--ink);
}

.gdc-code-content {
  padding: 12px 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.55;
  color: var(--ink);
  white-space: pre-wrap;
  word-break: break-all;
  max-height: 400px;
  overflow-y: auto;
}

/* 底部 3-Tab Bar */
.app-tabbar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(242, 239, 233, 0.94);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: space-around;
  padding: 6px 12px calc(8px + var(--safe-b));
  z-index: 10;
}

.tab-item {
  flex: 1;
  max-width: 140px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 6px 0;
  border-radius: var(--radius-sm);
  color: var(--muted);
  transition: all 0.15s ease;
}

.tab-item.active {
  color: var(--ink);
}

.tab-icon {
  stroke-width: 1.8;
  transition: transform 0.15s ease;
}

.tab-item.active .tab-icon {
  stroke-width: 2.2;
  transform: scale(1.05);
}

.tab-text {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.04em;
}

/* 抽屉 & 模态窗体系 */
.drawer-scrim {
  position: fixed;
  inset: 0;
  background: rgba(28, 25, 23, 0.45);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  z-index: 40;
  padding: 16px 16px calc(16px + var(--safe-b));
  animation: fadeIn 0.15s ease;
}

.drawer-scrim[hidden] {
  display: none;
}

.drawer-panel {
  width: min(44rem, 100%);
  height: min(88dvh, 720px);
  background: var(--page);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg) var(--radius-lg) var(--radius-md) var(--radius-md);
  padding: 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  box-shadow: var(--shadow-lg);
  animation: slideUp 0.2s ease-out;
}

.drawer-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.drawer-title-wrap h2 {
  font-size: 18px;
  font-weight: 700;
}

.drawer-subtitle {
  font-size: 12px;
  color: var(--muted);
}

.btn-close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  color: var(--muted);
  border-radius: 999px;
  transition: all 0.15s ease;
}

.btn-close:hover {
  background: var(--card-inner);
  color: var(--ink);
}

.drawer-search-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--card-inner);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 7px 10px;
}

.search-icon {
  color: var(--muted);
  flex-shrink: 0;
}

.drawer-search-bar input {
  width: 100%;
  outline: none;
  font-size: 13px;
  color: var(--ink);
}

.drawer-search-bar input::placeholder {
  color: #9C9589;
}

/* 历史列表 */
.history-list-view {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-right: 2px;
}

.history-card {
  text-align: left;
  background: var(--card-inner);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  transition: all 0.15s ease;
}

.history-card:hover {
  background: #fff;
  border-color: var(--ink);
}

.hist-top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
}

.hist-en {
  font-family: var(--font-sans);
  font-size: 15px;
  color: var(--ink);
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: -0.01em;
}

.hist-cn {
  font-size: 13px;
  color: var(--muted);
}

.hist-chunks {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-top: 4px;
}

.hist-chunk-tag {
  font-size: 11px;
  color: var(--muted);
  background: var(--page);
  border: 1px solid var(--line);
  padding: 1px 7px;
  border-radius: 999px;
}

.empty-state {
  margin: auto 0;
  text-align: center;
  padding: 32px 16px;
  color: var(--muted);
}

.empty-state-title {
  font-family: var(--font-sans);
  font-size: 18px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 6px;
}

/* 设置模态窗 */
.settings-modal {
  width: min(40rem, 100%);
  background: var(--page);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 20px 22px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  box-shadow: var(--shadow-lg);
  max-height: min(90dvh, 640px);
  overflow-y: auto;
}

.modal-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-head h2 {
  font-size: 17px;
  font-weight: 700;
}

.modal-intro {
  font-size: 12px;
  color: var(--muted);
  line-height: 1.45;
}

.settings-fields {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.modal-field {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.field-label {
  font-size: 11px;
  font-weight: 600;
  color: var(--muted);
  letter-spacing: 0.04em;
}

.field-label-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.btn-fetch-models {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 11px;
  font-weight: 600;
  color: var(--accent-ink);
  background: var(--accent-light);
  border: 1px solid #EACEC8;
  padding: 2px 7px;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.btn-fetch-models:hover {
  background: var(--accent);
  color: #fff;
}

.btn-fetch-models.loading {
  opacity: 0.6;
  pointer-events: none;
}

.btn-fetch-models.loading svg {
  animation: spin 1s linear infinite;
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.modal-field input,
.modal-field select {
  width: 100%;
  border: 1px solid var(--line);
  background: var(--card-inner);
  border-radius: var(--radius-sm);
  padding: 8px 10px;
  font-size: 13px;
  color: var(--ink);
  outline: none;
}

.modal-field input:focus,
.modal-field select:focus {
  border-color: var(--ink);
  background: #fff;
}

.modal-actions {
  display: flex;
  gap: 10px;
  padding-top: 6px;
}

.auth-tabs {
  display: flex;
  gap: 6px;
  padding: 3px;
  background: var(--card-inner);
  border-radius: var(--radius-sm);
}

.auth-tab {
  flex: 1;
  height: 32px;
  border-radius: 5px;
  font-size: 13px;
  font-weight: 600;
  color: var(--muted);
}

.auth-tab.active {
  background: var(--page);
  color: var(--ink);
  box-shadow: var(--shadow-sm);
}

.auth-hint {
  font-size: 11px;
  color: var(--muted);
  line-height: 1.45;
}

.account-email {
  font-size: 14px;
  font-weight: 600;
  word-break: break-all;
}

/* Toast 通知 */
.toast {
  position: fixed;
  left: 50%;
  bottom: calc(78px + var(--safe-b));
  transform: translateX(-50%);
  background: var(--ink);
  color: var(--page);
  padding: 8px 16px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 500;
  z-index: 50;
  box-shadow: var(--shadow-md);
  pointer-events: none;
  animation: fadeIn 0.15s ease;
}

/* 桌面端优化 */
@media (min-width: 680px) {
  body {
    font-size: 16px;
  }
  .drawer-scrim {
    align-items: center;
  }
  .drawer-panel {
    border-radius: var(--radius-lg);
  }
  .natural-sentence {
    font-size: 21px;
  }
}