/* ==========================================================================
   Edge TTS 前端样式
   动效遵循 Apple 流体界面规范：只动 transform / opacity（手风琴用 grid-template-rows
   作为唯一例外），UI 动画一律 < 300ms，进场用自定义 ease-out，永不 scale(0)。
   ========================================================================== */

:root {
  /* 缓动曲线：内置的 ease-out 太弱，UI 一律用这三条 */
  --ease-out: cubic-bezier(0.23, 1, 0.32, 1);
  --ease-in-out: cubic-bezier(0.77, 0, 0.175, 1);
  --ease-drawer: cubic-bezier(0.32, 0.72, 0, 1);

  /* 时长：UI 动画全部在 300ms 以内 */
  --dur-press: 160ms;
  --dur-fast: 150ms;
  --dur-popover: 200ms;
  --dur-panel: 200ms;
  --dur-sheet: 400ms;

  /* 颜色（浅色） */
  --bg: #f5f5f7;
  --bg-accent-1: #eef2ff;
  --bg-accent-2: #fdf2f8;
  --surface: rgba(255, 255, 255, 0.72);
  --surface-solid: #ffffff;
  --surface-raised: rgba(255, 255, 255, 0.86);
  --hairline: rgba(0, 0, 0, 0.08);
  --hairline-strong: rgba(0, 0, 0, 0.14);
  --highlight: rgba(255, 255, 255, 0.7);
  --text: #1d1d1f;
  --text-secondary: #6e6e73;
  --text-tertiary: #86868b;
  --accent: #0071e3;
  --accent-hover: #0077ed;
  --accent-soft: rgba(0, 113, 227, 0.1);
  --success: #1d8a4e;
  --success-soft: rgba(29, 138, 78, 0.1);
  --danger: #d70015;
  --danger-soft: rgba(215, 0, 21, 0.09);
  --field-bg: rgba(255, 255, 255, 0.9);
  --seg-track: rgba(120, 120, 128, 0.12);
  --seg-thumb: #ffffff;
  --shadow-panel: 0 1px 2px rgba(0, 0, 0, 0.04), 0 12px 32px rgba(0, 0, 0, 0.08);
  --shadow-popover: 0 4px 12px rgba(0, 0, 0, 0.08), 0 24px 60px rgba(0, 0, 0, 0.18);
  --radius-panel: 22px;
  --radius-field: 12px;
  --radius-pill: 980px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0b0d;
    --bg-accent-1: #101725;
    --bg-accent-2: #1b1220;
    --surface: rgba(30, 30, 34, 0.72);
    --surface-solid: #1c1c1e;
    --surface-raised: rgba(38, 38, 42, 0.9);
    --hairline: rgba(255, 255, 255, 0.1);
    --hairline-strong: rgba(255, 255, 255, 0.18);
    --highlight: rgba(255, 255, 255, 0.14);
    --text: #f5f5f7;
    --text-secondary: #a1a1a6;
    --text-tertiary: #8e8e93;
    --accent: #0a84ff;
    --accent-hover: #3b9bff;
    --accent-soft: rgba(10, 132, 255, 0.16);
    --success: #30d158;
    --success-soft: rgba(48, 209, 88, 0.14);
    --danger: #ff453a;
    --danger-soft: rgba(255, 69, 58, 0.14);
    --field-bg: rgba(255, 255, 255, 0.06);
    --seg-track: rgba(120, 120, 128, 0.24);
    --seg-thumb: #48484a;
    --shadow-panel: 0 1px 2px rgba(0, 0, 0, 0.3), 0 16px 40px rgba(0, 0, 0, 0.4);
    --shadow-popover: 0 4px 12px rgba(0, 0, 0, 0.4), 0 28px 70px rgba(0, 0, 0, 0.6);
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

/* 显式 display 会盖掉 hidden 属性的默认样式，这里统一兜住 */
[hidden] {
  display: none !important;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  /* 系统字体优先：自带光学尺寸与字距表 */
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  font-size: 1rem;
  line-height: 1.5;
  color: var(--text);
  background: var(--bg);
  background-image:
    radial-gradient(60rem 40rem at 15% -10%, var(--bg-accent-1), transparent 60%),
    radial-gradient(50rem 40rem at 95% 5%, var(--bg-accent-2), transparent 55%);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
}

.page {
  max-width: 46rem;
  margin: 0 auto;
  padding: 3.5rem 1.25rem 4rem;
}

/* ---------------------------------------------------------------- 标题 */

.masthead {
  text-align: center;
  margin-bottom: 2rem;
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 6vw, 2.75rem);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.02em;
  font-optical-sizing: auto;
}

.subtitle {
  margin: 0.6rem 0 0;
  font-size: 1rem;
  color: var(--text-secondary);
  letter-spacing: 0;
}

/* ---------------------------------------------------------------- 面板 */

.panel {
  /* 半透明材质 + 顶部 1px 亮边（光打在材质上） */
  background: var(--surface);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border: 1px solid var(--hairline);
  border-top-color: var(--highlight);
  border-radius: var(--radius-panel);
  box-shadow: var(--shadow-panel);
  padding: 1.5rem;
}

.field {
  display: block;
  margin-bottom: 1.25rem;
}

.field-tight {
  margin-bottom: 0.9rem;
}

.field-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
}

.field-label {
  display: block;
  margin-bottom: 0.5rem;
  font-size: 0.875rem;
  font-weight: 590;
  letter-spacing: -0.01em;
  color: var(--text-secondary);
}

.field-head .field-label {
  margin-bottom: 0;
}

.value {
  font-variant-numeric: tabular-nums;
  color: var(--accent);
  font-weight: 590;
}

.muted {
  color: var(--text-tertiary);
  font-weight: 400;
}

/* ---------------------------------------------------------------- 工作区布局
   窄屏：单列堆叠（文本 → 设置）。
   ≥760px：左栏文本、右栏设置并排，操作区与播放器横跨整行。 */

.workspace {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
}

.column-side {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}

/* 语速与音调并排：两栏布局下这是控制右栏高度的关键 */
.pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.9rem;
}

/* 栏内间距交给 grid/flex 的 gap，去掉字段自带的下边距 */
.workspace .field,
.workspace .accordion {
  margin-bottom: 0;
}

/* ---------------------------------------------------------------- 输入控件 */

.input,
.textarea {
  width: 100%;
  padding: 0.7rem 0.85rem;
  font: inherit;
  font-size: 1rem;
  color: var(--text);
  background: var(--field-bg);
  border: 1px solid var(--hairline-strong);
  border-radius: var(--radius-field);
  transition: border-color var(--dur-fast) ease, box-shadow var(--dur-fast) ease;
}

.textarea {
  min-height: 7.5rem;
  max-height: 22rem;
  /* 随内容自适应高度：不动画、不引起布局动画，只是输入时的一次重排。
     只有 Chromium 支持，其他浏览器忽略此属性、退回固定高度加滚动。 */
  field-sizing: content;
  resize: vertical;
  line-height: 1.6;
}

.input:focus,
.textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-soft);
}

.input::placeholder,
.textarea::placeholder {
  color: var(--text-tertiary);
}

.field-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 0.5rem;
  font-size: 0.8125rem;
  font-variant-numeric: tabular-nums;
}

.field-foot .over-limit {
  color: var(--danger);
  font-weight: 590;
}

.pause-control {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.pause-input {
  width: 4.5rem;
  padding: 0.35rem 0.5rem;
  font: inherit;
  font-size: 0.875rem;
  text-align: center;
  font-variant-numeric: tabular-nums;
  color: var(--text);
  background: var(--field-bg);
  border: 1px solid var(--hairline-strong);
  border-radius: 9px;
  transition: border-color var(--dur-fast) ease, box-shadow var(--dur-fast) ease;
}

.pause-input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

/* 滑块：原生控件，不做动画（拖动过程要 1:1 跟手） */
.range {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 1.5rem;
  margin: 0;
  background: transparent;
  cursor: pointer;
}

.range::-webkit-slider-runnable-track {
  height: 4px;
  border-radius: 2px;
  background: var(--hairline-strong);
}

.range::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 1.125rem;
  height: 1.125rem;
  margin-top: -0.3125rem;
  border-radius: 50%;
  background: var(--surface-solid);
  border: 0.5px solid var(--hairline-strong);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
}

.range::-moz-range-track {
  height: 4px;
  border-radius: 2px;
  background: var(--hairline-strong);
}

.range::-moz-range-thumb {
  width: 1.125rem;
  height: 1.125rem;
  border-radius: 50%;
  background: var(--surface-solid);
  border: 0.5px solid var(--hairline-strong);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
}

.range:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
  border-radius: var(--radius-pill);
}

/* ---------------------------------------------------------------- 按钮 */

.btn {
  font: inherit;
  font-size: 0.9375rem;
  font-weight: 590;
  letter-spacing: -0.01em;
  padding: 0.7rem 1.1rem;
  border: 1px solid transparent;
  border-radius: var(--radius-field);
  cursor: pointer;
  /* 按压反馈：只动 transform，160ms ease-out */
  transition: transform var(--dur-press) var(--ease-out), background-color var(--dur-fast) ease,
    border-color var(--dur-fast) ease, opacity var(--dur-fast) ease;
}

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

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.btn:disabled:active {
  transform: none;
}

.btn:focus-visible,
.link-btn:focus-visible,
.icon-btn:focus-visible,
.play-btn:focus-visible,
.voice-trigger:focus-visible,
.accordion-trigger:focus-visible,
.disclosure summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  flex: 1;
}

.btn-secondary {
  background: var(--surface-raised);
  color: var(--text);
  border-color: var(--hairline-strong);
  flex: 1;
}

.btn-quiet {
  padding: 0.35rem 0.7rem;
  font-size: 0.8125rem;
  background: var(--accent-soft);
  color: var(--accent);
  border-radius: 9px;
}

.link-btn {
  font: inherit;
  font-size: 0.8125rem;
  color: var(--accent);
  background: none;
  border: 0;
  padding: 0.15rem 0.25rem;
  cursor: pointer;
  border-radius: 6px;
  transition: opacity var(--dur-fast) ease;
}

.link-btn:active {
  opacity: 0.6;
}

.icon-btn {
  display: grid;
  place-items: center;
  width: 2.5rem;
  height: 2.5rem;
  color: var(--text-secondary);
  background: transparent;
  border: 0;
  border-radius: 50%;
  cursor: pointer;
  transition: transform var(--dur-press) var(--ease-out), background-color var(--dur-fast) ease,
    color var(--dur-fast) ease;
}

.icon-btn svg {
  width: 1.15rem;
  height: 1.15rem;
}

.icon-btn:active {
  transform: scale(0.94);
}

.actions {
  display: flex;
  gap: 0.75rem;
  margin-top: 0.5rem;
}

/* ---------------------------------------------------------------- 音色触发器 */

.voice-trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  width: 100%;
  padding: 0.6rem 0.8rem;
  font: inherit;
  text-align: left;
  color: var(--text);
  background: var(--field-bg);
  border: 1px solid var(--hairline-strong);
  border-radius: var(--radius-field);
  cursor: pointer;
  transition: transform var(--dur-press) var(--ease-out), border-color var(--dur-fast) ease;
}

.voice-trigger:active {
  transform: scale(0.985);
}

.voice-trigger-text {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.voice-trigger-label {
  font-weight: 590;
  font-size: 0.9375rem;
  line-height: 1.3;
}

.voice-trigger-meta {
  font-size: 0.75rem;
  line-height: 1.35;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.chevron {
  width: 1rem;
  height: 1rem;
  flex-shrink: 0;
  color: var(--text-tertiary);
  transition: transform var(--dur-popover) var(--ease-out);
}

[aria-expanded="true"] .chevron {
  transform: rotate(180deg);
}

/* ---------------------------------------------------------------- 手风琴 */

.accordion {
  border-top: 1px solid var(--hairline);
  margin: 0.25rem 0 1.25rem;
}

.accordion-heading {
  margin: 0;
  font-size: inherit;
  font-weight: inherit;
}

.accordion-trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 0.9rem 0;
  font: inherit;
  font-size: 0.9375rem;
  font-weight: 590;
  letter-spacing: -0.01em;
  color: var(--text);
  background: none;
  border: 0;
  cursor: pointer;
}

/* 手风琴高度动画是规范里唯一容忍的布局动画例外，控制在 200ms */
.accordion-panel {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows var(--dur-panel) var(--ease-out);
}

.accordion-panel[data-open="true"] {
  grid-template-rows: 1fr;
}

.accordion-inner {
  overflow: hidden;
  min-height: 0;
  padding-bottom: 1rem;
  opacity: 0;
  transform: translateY(-4px);
  transition: opacity var(--dur-panel) var(--ease-out), transform var(--dur-panel) var(--ease-out);
}

.accordion-panel[data-open="true"] .accordion-inner {
  opacity: 1;
  transform: none;
}

.checks {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(11rem, 1fr));
  gap: 0.6rem 1rem;
  margin-bottom: 1rem;
}

.check {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9375rem;
  cursor: pointer;
}

.check input {
  width: 1.05rem;
  height: 1.05rem;
  accent-color: var(--accent);
  cursor: pointer;
}

/* ---------------------------------------------------------------- 状态提示
   浮层形式：不占布局高度，所以出现/消失不会顶动页面（布局跳动本身就是该避免的）。 */

.status {
  position: fixed;
  right: 1.5rem;
  bottom: 1.5rem;
  z-index: 60;
  margin: 0;
  max-width: min(34rem, calc(100vw - 3rem));
  padding: 0.7rem 1.15rem;
  font-size: 0.9375rem;
  line-height: 1.45;
  color: var(--text);
  background: var(--surface-solid);
  border: 1px solid var(--hairline-strong);
  border-radius: var(--radius-pill);
  box-shadow: var(--shadow-popover);
  transition: opacity var(--dur-panel) var(--ease-out), transform var(--dur-panel) var(--ease-out);
}

.status:not([hidden]) {
  @starting-style {
    opacity: 0;
    transform: translateY(12px);
  }
}

.status[data-tone="info"] {
  color: var(--accent);
}

.status[data-tone="success"] {
  color: var(--success);
}

.status[data-tone="error"] {
  color: var(--danger);
}

/* ---------------------------------------------------------------- 播放器 */

.player {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  margin-top: 0.6rem;
  padding: 0.6rem 0.9rem;
  background: var(--surface-raised);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-field);
  transition: opacity var(--dur-panel) var(--ease-out), transform var(--dur-panel) var(--ease-out);
}

.player:not([hidden]) {
  @starting-style {
    opacity: 0;
    transform: translateY(8px);
  }
}

/* 音频元素只作为播放引擎，界面由自定义控件承载 */
#audio {
  display: none;
}

.play-btn {
  display: grid;
  place-items: center;
  width: 2.75rem;
  height: 2.75rem;
  flex-shrink: 0;
  color: #fff;
  background: var(--accent);
  border: 0;
  border-radius: 50%;
  cursor: pointer;
  transition: transform var(--dur-press) var(--ease-out), background-color var(--dur-fast) ease;
}

.play-btn:active {
  transform: scale(0.94);
}

.play-btn svg {
  width: 1.35rem;
  height: 1.35rem;
}

.play-btn .icon-pause,
.player[data-playing="true"] .icon-play {
  display: none;
}

.player[data-playing="true"] .icon-pause {
  display: block;
}

.player-track {
  flex: 1;
  min-width: 0;
}

.progress {
  position: relative;
  height: 1.25rem;
  display: flex;
  align-items: center;
  cursor: pointer;
  touch-action: none;
}

.progress::before {
  content: "";
  position: absolute;
  inset-inline: 0;
  height: 4px;
  border-radius: 2px;
  background: var(--hairline-strong);
}

.progress-fill {
  position: absolute;
  inset-inline-start: 0;
  width: 100%;
  height: 4px;
  border-radius: 2px;
  background: var(--accent);
  /* 只动 transform，进度用 scaleX 驱动，绝不改 width */
  transform: scaleX(0);
  transform-origin: left center;
}

.progress-knob {
  position: absolute;
  inset-inline-start: 0;
  width: 0.75rem;
  height: 0.75rem;
  border-radius: 50%;
  background: var(--surface-solid);
  border: 0.5px solid var(--hairline-strong);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.25);
  transform: translateX(0);
  opacity: 0;
  transition: opacity var(--dur-fast) ease;
}

.progress:focus-visible .progress-knob,
.progress[data-dragging="true"] .progress-knob {
  opacity: 1;
}

.player-times {
  display: flex;
  justify-content: space-between;
  margin-top: 0.15rem;
  font-size: 0.75rem;
  font-variant-numeric: tabular-nums;
  color: var(--text-tertiary);
}

/* ---------------------------------------------------------------- 折叠区块 */

/* 折叠区块：窄屏纵向排列，宽屏并排，省下一行高度 */
.extras {
  display: grid;
  gap: 0.75rem;
  margin-top: 1rem;
}

.extras .disclosure {
  margin-top: 0;
}

@media (min-width: 1000px) {
  .extras {
    grid-template-columns: 1fr 1fr;
    align-items: start;
  }
}

.disclosure {
  background: var(--surface);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-field);
  overflow: hidden;
}

.disclosure summary {
  padding: 0.7rem 1.1rem;
  font-size: 0.9375rem;
  font-weight: 590;
  letter-spacing: -0.01em;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

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

.disclosure summary::after {
  content: "";
  width: 0.5rem;
  height: 0.5rem;
  border-right: 2px solid var(--text-tertiary);
  border-bottom: 2px solid var(--text-tertiary);
  transform: rotate(45deg) translateY(-2px);
  transition: transform var(--dur-popover) var(--ease-out);
}

.disclosure[open] summary::after {
  transform: rotate(-135deg) translateY(-2px);
}

.disclosure-body {
  padding: 0 1.1rem 1.1rem;
}

.prose {
  margin: 0 0 0.75rem;
  font-size: 0.875rem;
  line-height: 1.6;
  color: var(--text-secondary);
}

.prose code,
.code {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.8125rem;
}

.prose code {
  padding: 0.1rem 0.35rem;
  background: var(--accent-soft);
  color: var(--accent);
  border-radius: 5px;
}

.code {
  margin: 0;
  padding: 0.85rem 1rem;
  overflow-x: auto;
  line-height: 1.55;
  color: var(--text-secondary);
  background: var(--field-bg);
  border: 1px solid var(--hairline);
  border-radius: 10px;
}

.footer {
  margin-top: 1rem;
  text-align: center;
  font-size: 0.8125rem;
  color: var(--text-tertiary);
}

.footer a {
  color: var(--text-secondary);
  text-decoration: none;
  border-bottom: 1px solid var(--hairline-strong);
}

/* ---------------------------------------------------------------- 音色选择面板 */

.overlay {
  position: fixed;
  inset: 0;
  z-index: 50;
}

.overlay-scrim {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.28);
  opacity: 0;
  transition: opacity var(--dur-popover) var(--ease-out);
}

.overlay[data-open="true"] .overlay-scrim {
  opacity: 1;
}

.sheet {
  position: absolute;
  display: flex;
  flex-direction: column;
  background: var(--surface-solid);
  border: 1px solid var(--hairline);
  border-radius: 16px;
  box-shadow: var(--shadow-popover);
  overflow: hidden;
  /* 进场：从 scale(0.96) 起，origin 由 JS 锚定到触发器 */
  opacity: 0;
  transform: scale(0.96);
  transition: opacity var(--dur-popover) var(--ease-out), transform var(--dur-popover) var(--ease-out);
}

.overlay[data-open="true"] .sheet {
  opacity: 1;
  transform: none;
}

.sheet-head {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 0.6rem 0.6rem 0.75rem;
  border-bottom: 1px solid var(--hairline);
}

.search {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex: 1;
  min-width: 0;
  color: var(--text-tertiary);
}

.search svg {
  width: 1rem;
  height: 1rem;
  flex-shrink: 0;
}

.search input {
  flex: 1;
  min-width: 0;
  padding: 0.35rem 0;
  font: inherit;
  font-size: 0.9375rem;
  color: var(--text);
  background: none;
  border: 0;
}

.search input:focus {
  outline: none;
}

.voice-list {
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: 0.35rem;
  flex: 1;
}

/* 分段控件（语言 / 性别筛选）：选中态是一块滑动指示片，只动 transform */
.sheet-filters {
  display: flex;
  gap: 0.5rem;
  padding: 0.6rem 0.75rem;
  border-bottom: 1px solid var(--hairline);
}

.segmented {
  position: relative;
  display: flex;
  flex: 1;
  padding: 2px;
  background: var(--seg-track);
  border-radius: 9px;
}

.seg-indicator {
  position: absolute;
  top: 2px;
  bottom: 2px;
  left: 2px;
  /* 三个分段等宽，所以指示片宽度固定，靠 translateX 平移即可（不碰 width/left） */
  width: calc((100% - 4px) / 3);
  background: var(--seg-thumb);
  border-radius: 7px;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.12);
  transition: transform var(--dur-popover) var(--ease-out);
}

.seg {
  position: relative;
  z-index: 1;
  flex: 1;
  padding: 0.3rem 0.15rem;
  font: inherit;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: none;
  border: 0;
  border-radius: 7px;
  cursor: pointer;
  transition: color var(--dur-fast) ease;
}

.seg[aria-checked="true"] {
  color: var(--text);
  font-weight: 590;
}

.seg:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

/* 每组语言一个块容器：组标题的 sticky 以组为边界，滚出时被自然顶走 */
.voice-group {
  display: block;
}

.voice-group-label {
  position: sticky;
  top: 0;
  z-index: 1;
  padding: 0.5rem 0.65rem 0.3rem;
  font-size: 0.75rem;
  font-weight: 590;
  color: var(--text-tertiary);
  background: var(--surface-solid);
}

.voice-item {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  width: 100%;
  padding: 0.5rem 0.65rem;
  font: inherit;
  text-align: left;
  color: var(--text);
  background: none;
  border: 0;
  border-radius: 9px;
  cursor: pointer;
  transition: background-color var(--dur-fast) ease;
}

.voice-item[aria-selected="true"] {
  background: var(--accent-soft);
}

.voice-item-name {
  display: flex;
  align-items: baseline;
  gap: 0.4rem;
  min-width: 0;
}

.voice-item-label {
  font-size: 0.9375rem;
  font-weight: 500;
  white-space: nowrap;
}

.voice-item-id {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.6875rem;
  color: var(--text-tertiary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.voice-item-tags {
  display: flex;
  gap: 0.25rem;
  margin-inline-start: auto;
  flex-shrink: 0;
}

.tag {
  padding: 0.1rem 0.4rem;
  font-size: 0.6875rem;
  color: var(--text-secondary);
  background: var(--hairline);
  border-radius: 5px;
  white-space: nowrap;
}

.tag-legacy {
  color: var(--text-tertiary);
  border: 1px dashed var(--hairline-strong);
  background: none;
}

.voice-item-check {
  width: 1rem;
  height: 1rem;
  flex-shrink: 0;
  color: var(--accent);
  opacity: 0;
  transition: opacity var(--dur-fast) ease;
}

.voice-item[aria-selected="true"] .voice-item-check {
  opacity: 1;
}

.voice-empty {
  padding: 2rem 1rem;
  text-align: center;
  font-size: 0.875rem;
  color: var(--text-tertiary);
}

/* ---------------------------------------------------------------- 桌面布局
   两栏并排，把横向空间用起来，整页基本不需要滚动。 */

@media (min-width: 760px) {
  .page {
    max-width: 62rem;
    padding-top: 1.5rem;
    padding-bottom: 1.5rem;
  }

  .masthead {
    margin-bottom: 1rem;
  }

  h1 {
    font-size: clamp(1.75rem, 3.2vw, 2.25rem);
  }

  .subtitle {
    margin-top: 0.45rem;
  }

  .panel {
    padding: 1.25rem 1.75rem;
  }

  .workspace {
    grid-template-columns: minmax(0, 1.6fr) minmax(14rem, 1fr);
    gap: 1.75rem;
  }

  /* 文本区撑满左栏高度，和右侧设置栏底部对齐 */
  .column-main {
    display: flex;
    flex-direction: column;
  }

  .column-main .textarea {
    flex: 1 1 auto;
    field-sizing: fixed;
    min-height: 9rem;
  }
}

/* ---------------------------------------------------------------- 交互媒体查询 */

/* hover 动效只在真有指针的设备上生效，避免触摸端 tap 误触 */
@media (hover: hover) and (pointer: fine) {
  .btn-primary:hover {
    background: var(--accent-hover);
  }

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

  .btn-quiet:hover,
  .link-btn:hover {
    background: var(--accent-soft);
  }

  .link-btn:hover {
    opacity: 1;
  }

  .icon-btn:hover {
    background: var(--hairline);
    color: var(--text);
  }

  .voice-trigger:hover {
    border-color: var(--accent);
  }

  .voice-item:hover {
    background: var(--hairline);
  }

  .progress:hover .progress-knob {
    opacity: 1;
  }

  .disclosure summary:hover,
  .accordion-trigger:hover {
    color: var(--accent);
  }
}

/* 减少动态效果：保留透明度过渡，去掉位移 */
@media (prefers-reduced-motion: reduce) {

  .status,
  .player,
  .sheet,
  .overlay-scrim,
  .accordion-inner,
  .chevron,
  .progress-knob,
  .voice-item-check,
  .disclosure summary::after {
    transition-duration: 120ms !important;
    transition-property: opacity !important;
  }

  .btn:active,
  .icon-btn:active,
  .play-btn:active,
  .voice-trigger:active {
    transform: none;
  }

  .accordion-panel {
    transition: none;
  }
}

/* 减少透明度：半透明材质改为实底，保证可读性 */
@media (prefers-reduced-transparency: reduce) {
  .panel,
  .disclosure {
    background: var(--surface-solid);
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }
}

/* ---------------------------------------------------------------- 响应式 */

@media (max-width: 759.98px) {
  .page {
    padding: 2.25rem 1rem 3rem;
  }

  .panel {
    padding: 1.15rem;
    border-radius: 18px;
  }

  .actions {
    flex-direction: column;
  }

  .field-head {
    flex-wrap: wrap;
  }

  /* 窄屏：提示改为底部通栏 */
  .status {
    left: 1rem;
    right: 1rem;
    bottom: 1rem;
    max-width: none;
    text-align: center;
  }

  /* 移动端音色面板改为底部抽屉：从下方滑入，用 iOS 抽屉曲线 */
  .sheet {
    inset-inline: 0;
    bottom: 0;
    max-height: 78vh;
    border-radius: 20px 20px 0 0;
    border-bottom: 0;
    transform: translateY(100%);
    transition: transform var(--dur-sheet) var(--ease-drawer), opacity var(--dur-popover) var(--ease-out);
  }

  .overlay[data-open="true"] .sheet {
    transform: none;
  }

  .voice-item {
    padding: 0.7rem 0.65rem;
  }
}

@media (prefers-reduced-motion: reduce) and (max-width: 759.98px) {
  .sheet {
    transform: none;
  }
}