:root {
  color-scheme: light;
  font-family: "Segoe UI Variable Text", "Segoe UI", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  background: #eef0f2;
  color: #2c3138;
  --canvas: #eef0f2;
  --primary: #44516a;
  --primary-hover: #354257;
  --success: #4f6a5c;
  --success-bg: #eef3f0;
  --success-border: #c9d6ce;
  --danger: #8a5b53;
  --danger-bg: #f4eeec;
  --danger-border: #e2cfc9;
  --warning: #a07a45;
  --warning-bg: #f6f1e8;
  --card-bg: #fbfbfc;
  --border: #e3e5e8;
  --text: #2c3138;
  --text-secondary: #5e6670;
  --text-muted: #8b929b;
  --shadow-sm: 0 1px 2px rgba(44, 49, 56, .05);
  --shadow-md: 0 10px 28px rgba(44, 49, 56, .07);
  --radius: 14px;
  --radius-lg: 18px;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  min-height: 100vh;
  background:
    radial-gradient(1100px 520px at 8% -8%, rgba(79, 106, 92, .07), transparent 55%),
    radial-gradient(900px 480px at 108% 0%, rgba(68, 81, 106, .08), transparent 52%),
    var(--canvas);
}
button { font-family: inherit; }

/* ── Login Overlay ── */
.login-overlay {
  position: fixed; inset: 0; z-index: 200;
  background: var(--canvas);
  display: flex; align-items: center; justify-content: center;
}
.login-card {
  background: #fff; border-radius: 16px; padding: 36px 32px 32px;
  box-shadow: 0 8px 30px rgba(0,0,0,.08);
  width: 400px; max-width: 90vw; text-align: center;
}
.login-card h1 {
  font-size: 1.3rem; color: var(--primary); margin-bottom: 6px;
}
.login-card h1 span { color: var(--text-secondary); font-weight: 400; font-size: .85rem; }
.login-sub { color: var(--text-muted); font-size: .84rem; margin-bottom: 24px; }
.login-field { margin-bottom: 12px; }
.login-field input {
  width: 100%; padding: 10px 14px; border: 1px solid var(--border);
  border-radius: 8px; font-size: .9rem; outline: none;
  transition: border-color .15s;
}
.login-field input:focus { border-color: var(--primary); }
.login-error {
  color: var(--danger); font-size: .82rem; margin-bottom: 12px;
}
.login-submit {
  width: 100%; padding: 10px 0; border: 0; border-radius: 8px;
  background: var(--primary); color: #fff; cursor: pointer;
  font-size: .95rem; margin-top: 8px;
}
.login-submit:hover { background: var(--primary-hover); }
.login-submit:disabled { opacity: .5; cursor: not-allowed; }
.login-footer {
  margin-top: 14px; font-size: .76rem; color: var(--text-muted);
}
.login-divider {
  display: flex; align-items: center; gap: 10px;
  margin: 4px 0 16px; color: var(--text-muted); font-size: .76rem;
}
.login-divider::before,
.login-divider::after {
  content: ""; flex: 1; height: 1px; background: var(--border);
}
.wechat-login-panel { margin-bottom: 18px; }
.wechat-login-title {
  margin: 0 0 10px; font-size: .88rem; font-weight: 700; color: #07c160;
}
.wechat-qr-host {
  min-height: 210px;
  display: flex; align-items: center; justify-content: center;
}
.wechat-qr-host iframe { max-width: 100%; }
.wechat-login-hint {
  margin: 8px 0 0; font-size: .78rem; color: var(--text-muted); line-height: 1.45;
}
.wechat-login-link {
  color: #07c160; font-weight: 600; text-decoration: none;
}
.wechat-login-link:hover { text-decoration: underline; }
.topbar-avatar {
  width: 26px; height: 26px; border-radius: 50%;
  object-fit: cover; border: 1px solid var(--border);
}
.topbar-user {
  font-size: .82rem; font-weight: 600; color: var(--primary);
}
.logout-btn {
  padding: 5px 10px; border: 1px solid var(--border); border-radius: 6px;
  background: transparent; color: var(--text-secondary); cursor: pointer;
  font-size: .78rem;
}
.logout-btn:hover { background: var(--danger-bg); color: var(--danger); border-color: var(--danger-border); }
.reset-btn {
  padding: 5px 12px; border: 1px solid #e11d48; border-radius: 999px;
  background: #e11d48; color: #fff; cursor: pointer;
  font-size: .78rem; font-weight: 600; white-space: nowrap;
}
.reset-btn:hover { background: #be123c; border-color: #be123c; }

.hub-overlay {
  position: fixed; inset: 0; z-index: 80;
  background:
    radial-gradient(1100px 520px at 8% -8%, rgba(79, 106, 92, .07), transparent 55%),
    radial-gradient(900px 480px at 108% 0%, rgba(68, 81, 106, .08), transparent 52%),
    var(--canvas);
  display: flex; align-items: center; justify-content: center;
  padding: 28px 20px;
}
.hub-overlay.hidden { display: none; }
.hub-board {
  width: min(860px, 100%);
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 36px 32px 32px;
  box-shadow: var(--shadow-md);
}
.hub-board h1 {
  font-size: 1.35rem; color: var(--primary); margin-bottom: 28px; font-weight: 700;
}
.hub-columns {
  display: grid; grid-template-columns: 1fr 1fr; gap: 28px;
}
.hub-col h2 {
  font-size: 1.08rem; color: var(--text); margin-bottom: 14px; font-weight: 700;
}
.hub-block {
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px;
  margin-bottom: 12px;
  background: #f7f8fa;
}
.hub-block h3 {
  font-size: .92rem; color: var(--text-secondary); margin-bottom: 12px; font-weight: 600;
}
.hub-pills { display: flex; gap: 8px; }
.hub-pills button {
  flex: 1; padding: 10px 8px; border: 1px solid var(--border); border-radius: 10px;
  background: #fff; color: var(--text); cursor: pointer; font-size: .92rem; font-weight: 600;
}
.hub-pills button:hover { background: #eef2f7; }
.hub-action {
  display: block; width: 100%; padding: 14px 16px; margin-top: 10px;
  border: 1px solid var(--border); border-radius: 12px;
  background: #fff; color: var(--text); cursor: pointer;
  font-size: .98rem; font-weight: 600; text-align: left;
}
.hub-action:hover { background: #eef2f7; }
.hub-action-primary {
  background: var(--primary); color: #fff; border-color: var(--primary);
}
.hub-action-primary:hover { background: var(--primary-hover); }
.remind-strip {
  position: fixed;
  left: 50%;
  bottom: 18px;
  transform: translateX(-50%);
  z-index: 40;
  display: flex;
  align-items: center;
  gap: 10px;
  max-width: calc(100% - 24px);
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: rgba(255, 255, 255, .94);
  box-shadow: var(--shadow-md);
  font-size: .82rem;
  color: var(--text-secondary);
}
.remind-strip.hidden { display: none; }
.remind-strip button {
  border: 1px solid var(--border);
  border-radius: 999px;
  background: #fff;
  color: var(--text);
  cursor: pointer;
  font-size: .8rem;
  font-weight: 600;
  padding: 4px 10px;
}
.remind-strip button:hover { background: #eef2f7; }
@media (max-width: 720px) {
  .hub-columns { grid-template-columns: 1fr; }
}

@keyframes resume-glow-pulse {
  0%, 100% { box-shadow: 0 0 0 2px rgba(201, 162, 39, .28), 0 0 14px rgba(201, 162, 39, .35); }
  50% { box-shadow: 0 0 0 7px rgba(201, 162, 39, .16), 0 0 28px rgba(201, 162, 39, .55); }
}
.sentence-container.resume-glow {
  animation: resume-glow-pulse 1.5s ease-in-out 5;
  border-color: #c9a227;
}
.topbar-upload.invite-upload {
  animation: resume-glow-pulse 1.5s ease-in-out 5;
  border-radius: 12px;
}

.reset-overlay {
  position: fixed; inset: 0; z-index: 220;
  display: flex; align-items: center; justify-content: center;
}
.reset-overlay.hidden { display: none; }
.reset-backdrop {
  position: absolute; inset: 0; background: rgba(15, 23, 42, .42);
}
.reset-dialog {
  position: relative; z-index: 1; background: #fff; border-radius: 24px;
  padding: 42px 36px 33px; width: 660px; min-height: 240px; max-width: calc(100vw - 32px);
  box-shadow: 0 16px 40px rgba(0, 0, 0, .16);
  display: flex; flex-direction: column; justify-content: center;
}
.reset-dialog-close {
  position: absolute; top: 14px; right: 14px;
  width: 36px; height: 36px; border: 0; border-radius: 999px;
  background: transparent; color: var(--text-secondary);
  font-size: 1.6rem; line-height: 1; cursor: pointer;
}
.reset-dialog-close:hover { background: #f1f5f9; color: var(--text); }
.reset-dialog p {
  margin: 0; color: var(--text); font-size: 1.5rem; line-height: 1.55; font-weight: 600;
}
.reset-dialog-actions {
  display: flex; gap: 15px; margin-top: 30px;
}
.reset-scope {
  flex: 1; padding: 15px 12px; border: 1px solid var(--border); border-radius: 15px;
  background: #f8fafc; color: var(--text); cursor: pointer; font-size: 1.35rem; font-weight: 600;
}
.reset-scope:hover { background: #eef2f7; }
.reset-scope:disabled { opacity: .55; cursor: not-allowed; }
.reset-scope-all {
  background: #e11d48; color: #fff; border-color: #be123c;
}
.reset-scope-all:hover { background: #be123c; }

/* ── Top Bar ── */
.topbar {
  background: var(--card-bg);
  border-bottom: 1px solid var(--border);
  padding: 14px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
  box-shadow: var(--shadow-sm);
  position: sticky; top: 0; z-index: 95;
}
.topbar-brand { font-size: 1.15rem; font-weight: 700; color: var(--primary); white-space: nowrap; cursor: pointer; }
.topbar-brand span { color: var(--text-secondary); font-weight: 400; font-size: .85rem; margin-left: 8px; }
.topbar-upload {
  display: flex; align-items: center; gap: 10px;
  font-size: .88rem; color: var(--text-secondary);
}
.topbar-upload input[type="file"] { font-size: .85rem; }
.topbar-upload button {
  padding: 7px 16px; border: 0; border-radius: 999px;
  background: var(--primary); color: #fff; cursor: pointer;
  font-size: .85rem; white-space: nowrap;
}
.topbar-upload button:hover { background: var(--primary-hover); }
.topbar-upload button:disabled { opacity: .5; cursor: not-allowed; }
.topbar-session {
  font-size: .8rem; color: var(--text-muted);
  max-width: 340px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.audio-download {
  font-size: .78rem;
  color: var(--primary);
  text-decoration: none;
  white-space: nowrap;
  font-weight: 600;
}
.audio-download:hover { text-decoration: underline; }

/* ── Audio processing animation ── */
body.processing-open { overflow: hidden; }
.processing-overlay {
  position: fixed;
  inset: 0;
  z-index: 260;
  display: grid;
  place-items: center;
  padding: 18px;
  background:
    radial-gradient(circle at 50% 10%, rgba(137, 181, 159, .25), transparent 42%),
    rgba(28, 42, 37, .88);
  backdrop-filter: blur(12px);
}
.processing-card {
  width: min(1120px, calc(100vw - 36px));
  max-height: calc(100vh - 36px);
  overflow: hidden auto;
  border: 1px solid rgba(255, 255, 255, .7);
  border-radius: 24px;
  background: #f8f6ed;
  box-shadow: 0 26px 80px rgba(10, 23, 18, .34);
}
.processing-video-shell {
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: #f6f3e8;
}
.processing-video-shell video {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
}
.processing-status {
  padding: 18px 24px 22px;
  color: #283c33;
}
.processing-kicker {
  margin: 0 0 4px;
  color: #668173;
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .08em;
}
.processing-status h2 {
  margin: 0 0 12px;
  color: #253b31;
  font-size: 1.22rem;
}
.processing-status-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 8px;
  color: #4e665b;
  font-size: .9rem;
}
.processing-status-row strong {
  min-width: 4ch;
  color: #27483a;
  text-align: right;
  font-variant-numeric: tabular-nums;
}
.processing-progress {
  height: 12px;
  overflow: hidden;
  border: 1px solid #c8d5cd;
  border-radius: 999px;
  background: #e3e9e4;
}
.processing-progress-fill {
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, #5d9daf, #5a8f78 58%, #e0b452);
  box-shadow: 0 0 14px rgba(70, 136, 112, .28);
  transition: width .28s ease-out;
}
.processing-detail {
  min-height: 1.35em;
  margin: 8px 0 0;
  overflow: hidden;
  color: #7a8b82;
  font-size: .78rem;
  text-overflow: ellipsis;
  white-space: nowrap;
}
@media (max-width: 720px) {
  .processing-overlay { padding: 10px; }
  .processing-card {
    width: calc(100vw - 20px);
    max-height: calc(100vh - 20px);
    border-radius: 18px;
  }
  .processing-status { padding: 14px 16px 17px; }
  .processing-status h2 { font-size: 1.05rem; }
}
@media (prefers-reduced-motion: reduce) {
  .processing-progress-fill { transition: none; }
  .processing-video-shell video { opacity: .82; }
}

/* ── Main Content ── */
main { padding: 28px 32px 56px; max-width: 1400px; margin: 0 auto; }

/* ── Full Listen Card ── */
.full-listen-card {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  text-align: center;
  box-shadow: var(--shadow-md);
  margin-bottom: 24px;
}
.full-listen-card h2 { font-size: 1.2rem; margin-bottom: 8px; }
.full-listen-card p { color: var(--text-secondary); margin-bottom: 18px; }
.full-listen-card button {
  padding: 12px 32px; border: 0; border-radius: 10px;
  background: var(--primary); color: #fff; cursor: pointer;
  font-size: 1rem;
}
.full-listen-card button:hover { background: var(--primary-hover); }

/* ── Sentence List ── */
.sentence-list-header {
  display: flex; align-items: baseline; gap: 12px; margin-bottom: 20px;
  flex-wrap: wrap;
}
.sentence-list-header h2 {
  font-size: 1.15rem; color: var(--text); margin: 0; white-space: nowrap;
}
.sentence-list-header p {
  color: var(--text-secondary); font-size: .88rem; margin: 0; flex: 1;
}
.sentence-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(420px, 1fr));
  gap: 12px;
  overflow: visible;
}

/* ── Sentence Container ── */
.sentence-container {
  position: relative;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 18px 16px;
  box-shadow: var(--shadow-sm);
  overflow: visible;
  transition: box-shadow .2s ease, border-color .2s ease, transform .2s ease;
}
.sentence-container:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}
.sentence-container.understood {
  border-color: var(--success-border);
  background: var(--success-bg);
}
.sentence-container.popping {
  z-index: 4;
  pointer-events: none;
  border-color: var(--success-border);
  background: var(--success-bg);
  animation: card-shell-fade .45s ease forwards;
}
.sentence-container.popping:hover {
  transform: none;
  box-shadow: var(--shadow-sm);
}
.sentence-container.popping > *:not(.burst-shard) {
  animation: card-pop .42s cubic-bezier(.16, .84, .32, 1) forwards;
}
.sentence-container.popped,
.sentence-container.popped:hover {
  background: transparent;
  border-color: transparent;
  box-shadow: none;
  transform: none;
  padding: 0;
  pointer-events: none;
  min-height: 96px;
}
.burst-shard {
  position: absolute;
  display: block;
  border-radius: 3px;
  pointer-events: none;
  z-index: 6;
  animation: shard-fly .52s cubic-bezier(.12, .72, .28, 1) forwards;
}
@keyframes card-pop {
  0% { transform: scale(1); opacity: 1; }
  16% { transform: scale(1.08); }
  100% { transform: scale(.08) rotate(12deg); opacity: 0; }
}
@keyframes card-shell-fade {
  0% { background: var(--success-bg); border-color: var(--success-border); }
  100% { background: transparent; border-color: transparent; box-shadow: none; }
}
@keyframes shard-fly {
  0% { transform: translate(0, 0) rotate(0) scale(1); opacity: 1; }
  100% { transform: translate(var(--dx), var(--dy)) rotate(var(--rot)) scale(.12); opacity: 0; }
}
@media (prefers-reduced-motion: reduce) {
  .sentence-container.popping { animation: card-shell-fade .18s ease forwards; }
  .sentence-container.popping > *:not(.burst-shard) {
    animation: card-pop-fade .18s ease forwards;
  }
  .sentence-container.is-playing .audio-waveform > span,
  .chunk-container.is-playing .audio-waveform > span {
    animation: none;
    transform: scaleY(.55);
  }
  @keyframes card-pop-fade { to { opacity: 0; } }
}
.sentence-heading {
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: 12px;
}
.sentence-heading strong { color: var(--text); font-size: .9rem; letter-spacing: .01em; }
.audio-waveform {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 2px;
  width: 28px;
  height: 16px;
  opacity: 0;
  pointer-events: none;
  transition: opacity .16s ease;
}
.audio-waveform > span {
  display: block;
  width: 2px;
  height: 14px;
  border-radius: 999px;
  background: var(--primary);
  transform: scaleY(.24);
  transform-origin: center;
}
.sentence-container.is-playing .audio-waveform,
.chunk-container.is-playing .audio-waveform { opacity: .82; }
.sentence-container.is-playing .audio-waveform > span,
.chunk-container.is-playing .audio-waveform > span {
  animation: listening-wave .72s ease-in-out infinite alternate;
}
.audio-waveform > span:nth-child(2) { animation-delay: -.18s; }
.audio-waveform > span:nth-child(3) { animation-delay: -.34s; }
.audio-waveform > span:nth-child(4) { animation-delay: -.08s; }
.audio-waveform > span:nth-child(5) { animation-delay: -.42s; }
.audio-waveform > span:nth-child(6) { animation-delay: -.26s; }
.audio-waveform > span:nth-child(7) { animation-delay: -.52s; }
@keyframes listening-wave {
  0% { transform: scaleY(.24); }
  100% { transform: scaleY(1); }
}
.sentence-state {
  font-size: .74rem; padding: 3px 10px; border-radius: 999px;
  background: #f1f2f4; color: var(--text-muted); font-weight: 600;
}
.sentence-container.understood .sentence-state {
  background: #e2ebe5; color: var(--success);
}
.button-row { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 4px; }
.button-row button {
  flex: 1; min-width: 0;
  padding: 8px 12px; border: 1px solid transparent; border-radius: 999px;
  font-size: .82rem; font-weight: 600; cursor: pointer;
  letter-spacing: .01em;
  transition: background .15s, border-color .15s, color .15s, transform .1s;
}
.button-row button:hover { filter: none; }
.button-row button:active { transform: scale(.98); }
.button-row button:disabled { opacity: .42; cursor: not-allowed; transform: none; }
.button-row button:first-child {
  background: #f4f5f7; color: var(--text);
  border-color: #dfe2e6;
}
.button-row button:first-child:hover { background: #eceef1; }
.button-row button.success {
  background: var(--success-bg); color: var(--success);
  border-color: var(--success-border);
}
.button-row button.success:hover { background: #e2ebe5; }
.button-row button.danger {
  background: var(--danger-bg); color: var(--danger);
  border-color: var(--danger-border);
}
.button-row button.danger:hover { background: #eadeda; }
.button-row button.resegment {
  background: var(--warning-bg); color: #7a5c32; border: 1px dashed #d9c4a0;
}
.button-row button.resegment:hover { background: #efe6d6; }
.sentence-status { font-size: .82rem; color: var(--text-secondary); min-height: 20px; }

/* ── Sentence focus overlay (没听懂 → 居中聆听) ── */
.sentence-focus-placeholder {
  border-radius: var(--radius);
  min-height: 96px;
  background:
    linear-gradient(180deg, rgba(251, 251, 252, .35), rgba(238, 240, 242, .2));
  border: 1px dashed #d7dbe0;
}
.sentence-focus-overlay {
  position: fixed;
  inset: 0;
  z-index: 130;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 28px 16px;
  perspective: 1600px;
  pointer-events: none;
}
.sentence-focus-overlay.show { pointer-events: auto; }
.sentence-focus-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(28, 32, 38, .28);
  opacity: 0;
  transition: opacity .42s ease;
}
.sentence-focus-overlay.show .sentence-focus-backdrop { opacity: 1; }
@supports ((-webkit-backdrop-filter: blur(18px)) or (backdrop-filter: blur(18px))) {
  .sentence-focus-backdrop {
    background: rgba(22, 26, 32, .22);
    -webkit-backdrop-filter: blur(18px) saturate(1.18);
    backdrop-filter: blur(18px) saturate(1.18);
  }
}
.sentence-focus-close {
  position: absolute;
  top: -14px;
  right: -14px;
  z-index: 3;
  width: 40px;
  height: 40px;
  border: 1px solid rgba(255, 255, 255, .55);
  border-radius: 999px;
  background: rgba(251, 251, 252, .94);
  color: var(--text);
  font-size: 1.35rem;
  line-height: 1;
  cursor: pointer;
  opacity: 0;
  box-shadow: 0 8px 20px rgba(44, 49, 56, .12);
  transition: opacity .28s ease, background .15s ease, transform .1s ease;
}
.sentence-focus-overlay.show .sentence-focus-close { opacity: 1; }
.sentence-focus-close:hover { background: #fff; }
.sentence-focus-close:active { transform: scale(.96); }
.sentence-focus-frame {
  position: relative;
  z-index: 2;
  width: min(720px, 88vw);
}
.sentence-focus-stage {
  position: relative;
  width: 100%;
  max-height: 82vh;
  border-radius: 22px;
}
.sentence-focus-stage:not(:empty)::before {
  content: "";
  position: absolute;
  inset: -14px;
  border-radius: 28px;
  pointer-events: none;
  z-index: 0;
  box-shadow:
    0 0 0 1px rgba(68, 81, 106, .2),
    0 0 22px rgba(68, 81, 106, .16),
    0 0 48px rgba(196, 168, 128, .14),
    0 22px 48px rgba(44, 49, 56, .12);
  animation: sentence-focus-halo 2.6s ease-in-out infinite;
}
.sentence-container.is-focusing {
  z-index: 2;
  transform-origin: center center;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  will-change: transform;
  box-shadow:
    0 0 0 1px rgba(68, 81, 106, .18),
    0 18px 40px rgba(44, 49, 56, .16);
}
.sentence-container.is-focusing:hover,
.sentence-container.is-focused:hover {
  transform: none;
}
.sentence-container.is-focused {
  position: relative;
  z-index: 1;
  width: 100%;
  max-height: 82vh;
  overflow: auto;
  padding: 22px 22px 20px;
  border-color: rgba(68, 81, 106, .22);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, .72),
    0 18px 40px rgba(44, 49, 56, .1);
}
.sentence-container.is-focused > .sentence-heading,
.sentence-container.is-focusing > .sentence-heading { display: none; }
.sentence-container.is-focused > .button-row,
.sentence-container.is-focusing > .button-row,
.sentence-container.is-focused > .sentence-status,
.sentence-container.is-focusing > .sentence-status { display: none; }
.sentence-listen-stage {
  display: none;
  margin: 4px 0 16px;
  padding: 18px 16px 14px;
  text-align: center;
  border-radius: 14px;
  background:
    radial-gradient(120% 80% at 50% 0%, rgba(68, 81, 106, .06), transparent 58%),
    #f6f7f8;
  border: 1px solid #e6e8eb;
}
.sentence-container.is-focusing .sentence-listen-stage,
.sentence-container.is-focused .sentence-listen-stage { display: block; }
.sentence-listen-wave {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 3px;
  height: 72px;
  margin-bottom: 10px;
}
.sentence-listen-wave > span {
  display: block;
  width: 3px;
  height: 100%;
  border-radius: 999px;
  background: var(--primary);
  opacity: .38;
  transform: scaleY(.22);
  transform-origin: center;
}
.sentence-container.is-focusing .sentence-listen-wave > span,
.sentence-container.is-focused .sentence-listen-wave > span {
  animation: listening-wave 1.8s ease-in-out infinite alternate;
}
.sentence-container.is-listening .sentence-listen-wave > span,
.sentence-container.is-playing .sentence-listen-wave > span {
  opacity: .9;
  animation-duration: .72s;
}
.sentence-listen-wave > span:nth-child(3n) { animation-delay: -.2s; height: 78%; }
.sentence-listen-wave > span:nth-child(3n+1) { animation-delay: -.46s; height: 100%; }
.sentence-listen-wave > span:nth-child(3n+2) { animation-delay: -.12s; height: 62%; }
.sentence-listen-guide {
  margin: 0;
  font-size: .98rem;
  line-height: 1.45;
  color: var(--text);
  font-weight: 600;
  letter-spacing: .01em;
  animation: listen-guide-pulse 1.45s ease-in-out infinite;
}
.sentence-container.is-focused .chunk-area > .chunk-status,
.sentence-container.is-focusing .chunk-area > .chunk-status { display: none; }
.sentence-container.is-focused [data-action="play-chunk"],
.sentence-container.is-focusing [data-action="play-chunk"] {
  position: relative;
  z-index: 1;
  border-color: rgba(68, 81, 106, .5);
  color: var(--text);
  box-shadow:
    0 0 0 1px rgba(68, 81, 106, .2),
    0 0 14px rgba(68, 81, 106, .32),
    0 0 30px rgba(196, 168, 128, .34);
  animation: play-guide-glow 1.55s ease-in-out infinite;
}
@keyframes listen-guide-pulse {
  0%, 100% { opacity: .38; }
  50% { opacity: 1; }
}
@keyframes play-guide-glow {
  0%, 100% {
    box-shadow:
      0 0 0 1px rgba(68, 81, 106, .16),
      0 0 10px rgba(68, 81, 106, .2),
      0 0 22px rgba(196, 168, 128, .16);
  }
  50% {
    box-shadow:
      0 0 0 2px rgba(68, 81, 106, .42),
      0 0 18px rgba(68, 81, 106, .42),
      0 0 36px rgba(196, 168, 128, .4);
  }
}
body.sentence-focus-open { overflow: hidden; }
@keyframes sentence-focus-halo {
  0%, 100% {
    box-shadow:
      0 0 0 1px rgba(68, 81, 106, .18),
      0 0 20px rgba(68, 81, 106, .14),
      0 0 44px rgba(196, 168, 128, .12),
      0 22px 48px rgba(44, 49, 56, .1);
  }
  50% {
    box-shadow:
      0 0 0 1px rgba(68, 81, 106, .38),
      0 0 32px rgba(68, 81, 106, .26),
      0 0 68px rgba(196, 168, 128, .26),
      0 26px 56px rgba(44, 49, 56, .14);
  }
}
@media (prefers-reduced-motion: reduce) {
  .sentence-focus-stage:not(:empty)::before { animation: none; }
  .sentence-container.is-focusing .sentence-listen-wave > span,
  .sentence-container.is-focused .sentence-listen-wave > span,
  .sentence-container.is-listening .sentence-listen-wave > span,
  .sentence-container.is-playing .sentence-listen-wave > span {
    animation: none;
    transform: scaleY(.55);
  }
  .sentence-listen-guide { animation: none; opacity: 1; }
  .sentence-container.is-focused [data-action="play-chunk"],
  .sentence-container.is-focusing [data-action="play-chunk"] { animation: none; }
}
@media (prefers-reduced-transparency: reduce) {
  .sentence-focus-backdrop {
    -webkit-backdrop-filter: none;
    backdrop-filter: none;
    background: rgba(28, 32, 38, .55);
  }
}

/* ── Chunk Area ── */
.chunk-area {
  margin-top: 14px; padding-top: 14px;
  border-top: 1px solid var(--border);
}
.chunk-heading { display: flex; justify-content: space-between; align-items: center; margin-bottom: 6px; }
.chunk-area h3 { font-size: .92rem; color: var(--text); margin: 0; }
.collapse-chunks-button {
  padding: 4px 11px; border: 1px solid #dfe2e6; border-radius: 999px;
  background: #fff; color: var(--text-secondary); font-size: .76rem; font-weight: 600; cursor: pointer;
}
.collapse-chunks-button:hover { background: #f4f5f7; color: var(--text); }
.chunk-status { font-size: .8rem; color: var(--text-muted); margin-bottom: 8px; }
.chunk-list { display: flex; flex-direction: column; gap: 10px; }

/* ── Chunk Container ── */
.chunk-container {
  background: var(--warning-bg);
  border-left: 3px solid var(--warning);
  border-radius: 0 8px 8px 0;
  padding: 12px 14px;
}
.chunk-container.understood { border-left-color: var(--success); background: var(--success-bg); }
.chunk-state { font-size: .76rem; padding: 1px 8px; border-radius: 10px; background: var(--warning-bg); color: #7a5c32; }
.chunk-container.understood .chunk-state { background: #e2ebe5; color: var(--success); }
.chunk-hint { margin-top: 10px; padding: 10px 12px; background: #fff; border-radius: 8px; border: 1px dashed var(--warning); }
.chunk-original { font-size: 1.05rem; font-weight: 600; color: var(--primary, #2563eb); margin-bottom: 6px; }
.chunk-translation { font-size: 1rem; color: var(--text); margin-bottom: 6px; }
.chunk-record, .chunk-training {
  margin-top: 10px; padding: 12px; border-radius: 8px;
  background: #f3f4f7; border: 1px solid var(--border);
}
.chunk-record strong { display: block; margin-bottom: 4px; }
.chunk-record p { font-size: .84rem; color: var(--text-secondary); margin-bottom: 8px; }
.training-chinese {
  padding: 14px; border-radius: 8px; background: #fff;
  font-size: 1.1rem; border: 1px solid var(--border);
}
.replay-result { margin-top: 10px; padding: 10px; background: #f8fafc; border-radius: 8px; }
.replay-result p { font-size: .84rem; color: var(--text-secondary); margin-bottom: 6px; }

.chunk-training h4 { margin-bottom: 10px; font-size: .92rem; color: var(--primary); }
.reference-answer { padding: 10px; background: var(--success-bg); border-radius: 6px; margin-top: 8px; font-size: .95rem; }
.training-status { font-size: .82rem; color: var(--text-secondary); margin-top: 6px; }

.layer-stage {
  position: relative;
  overflow: hidden;
  padding: 16px 16px 14px;
  border-radius: 16px;
  background:
    radial-gradient(120% 90% at 50% -20%, rgba(79, 106, 92, .14), transparent 58%),
    #f6f7f4;
}
.layer-stones {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-bottom: 12px;
}
.layer-stone {
  width: 11px;
  height: 11px;
  border-radius: 999px;
  background: #d5dbd6;
}
.layer-stone.done {
  background: var(--success);
  transform: scale(1.08);
}
.layer-stone.now {
  background: var(--primary);
  box-shadow: 0 0 0 4px rgba(68, 81, 106, .16);
}
.layer-prompt, .layer-context {
  margin: 0 0 10px;
  color: var(--text-secondary);
  font-size: .92rem;
  line-height: 1.55;
  text-align: center;
}
.layer-peek {
  margin: 0 0 12px;
  padding: 10px 12px;
  border-radius: 10px;
  background: #fff;
  color: var(--text);
  font-weight: 600;
  text-align: center;
}
.layer-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  margin: 12px 0 4px;
}
.layer-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 96px;
  padding: 8px 14px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: #fff;
  color: var(--text);
  font-size: .86rem;
  font-weight: 600;
  cursor: pointer;
}
.layer-btn.play {
  background: #1e293b;
  color: #fff;
  border-color: #1e293b;
}
.layer-btn.play:hover { background: #0f172a; }
.layer-btn.record:hover { background: #eef2ff; border-color: #c7d2fe; }
.layer-btn.record.recording {
  background: #b91c1c;
  color: #fff;
  border-color: #b91c1c;
  animation: history-rec-pulse 1s ease infinite;
}
.layer-btn.scoring { opacity: .7; cursor: wait; }
.layer-btn.ghost { background: transparent; }
.layer-meter {
  display: flex;
  align-items: flex-end;
  justify-content: center;
  gap: 3px;
  height: 28px;
  margin: 8px 0 2px;
}
.layer-meter span {
  width: 4px;
  height: 6px;
  border-radius: 2px;
  background: #7a8f7c;
}
.layer-result {
  margin-top: 12px;
  padding: 10px 12px;
  border-radius: 12px;
  background: #fff;
}
.layer-score-num {
  font-size: 2.2rem;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  text-align: center;
  line-height: 1.1;
  margin: 4px 0 14px;
}
.layer-score-num.is-low { color: #b91c1c; }
.layer-score-num.is-ok { color: #b45309; }
.layer-score-num.is-good { color: var(--success); }
.layer-score-num.is-great { color: #c026d3; }
.layer-result-row { margin-bottom: 6px; }
.layer-result-label {
  display: block;
  font-size: .72rem;
  font-weight: 700;
  color: var(--text-muted);
  margin-bottom: 2px;
}
.layer-result-original, .layer-result-heard {
  margin: 0;
  font-size: .92rem;
  line-height: 1.55;
}
.layer-pass-stamp {
  position: absolute;
  top: 14px;
  right: 14px;
  padding: 5px 10px;
  border: 2px solid var(--success);
  border-radius: 8px;
  color: var(--success);
  font-weight: 800;
  transform: rotate(12deg);
  background: rgba(255, 255, 255, .92);
  animation: layer-stamp-pop .45s ease;
}
.layer-stage.is-layer-pass {
  box-shadow: 0 0 0 4px rgba(79, 106, 92, .18);
}
.layer-stage.is-fx-low { animation: history-fx-shake .55s ease; }
.layer-stage.is-fx-ok { animation: history-fx-warm .7s ease; }
.layer-stage.is-fx-good { animation: history-fx-glow .75s ease; }
.layer-stage.is-fx-great { animation: history-fx-pop .85s ease; }
@keyframes layer-stamp-pop {
  0% { transform: rotate(12deg) scale(.6); opacity: 0; }
  70% { transform: rotate(14deg) scale(1.08); opacity: 1; }
  100% { transform: rotate(12deg) scale(1); }
}
@media (prefers-reduced-motion: reduce) {
  .layer-btn.record.recording, .layer-pass-stamp, .layer-stage.is-fx-low,
  .layer-stage.is-fx-ok, .layer-stage.is-fx-good, .layer-stage.is-fx-great {
    animation: none;
  }
}

/* ── Utility ── */
.hidden { display: none !important; }
.status { font-size: .84rem; color: var(--text-secondary); }
.hint { font-size: .8rem; color: var(--text-muted); }
button.translation {
  display: inline-block; background: #f3f4f7; color: var(--primary);
  font-size: .84rem; padding: 6px 12px; border: 0; border-radius: 6px; cursor: pointer;
}
button.translation:hover { background: #e8eaee; }

/* ── Empty state ── */
.empty-state {
  text-align: center; padding: 60px 20px; color: var(--text-muted);
}
.empty-state p { font-size: .95rem; }

/* ── History Panel ── */
.topbar-actions {
  display: flex; align-items: center; gap: 12px;
}
.history-toggle {
  padding: 7px 14px; border: 1px solid var(--border); border-radius: 999px;
  background: var(--card-bg); color: var(--text); cursor: pointer;
  font-size: .84rem; white-space: nowrap;
}
.history-toggle:hover { background: #f1f5f9; }

.history-panel {
  position: fixed; top: 0; right: 0; width: 540px; max-width: 92vw;
  height: 100vh; background: var(--card-bg);
  box-shadow: -4px 0 24px rgba(0,0,0,.12);
  z-index: 100; display: flex; flex-direction: column;
  overflow: hidden;
  transform: translateX(100%);
  transition: transform 0.25s ease;
}
.history-panel.slide-in { transform: translateX(0); }
.history-panel-header {
  display: flex; justify-content: space-between; align-items: center;
  padding: 18px 20px; border-bottom: 1px solid var(--border);
}
.history-panel-header h2 { font-size: 1.05rem; color: var(--text); }
.close-btn {
  width: 32px; height: 32px; border: 0; border-radius: 6px;
  background: transparent; font-size: 1.3rem; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  color: var(--text-secondary);
}
.close-btn:hover { background: #f1f5f9; }

.history-tabs {
  display: flex; border-bottom: 1px solid var(--border);
}
.history-tab {
  flex: 1; padding: 10px 0; border: 0; background: transparent;
  font-size: .84rem; color: var(--text-secondary); cursor: pointer;
  border-bottom: 2px solid transparent; transition: all .15s;
}
.history-tab.active { color: var(--primary); border-bottom-color: var(--primary); font-weight: 600; }
.history-tab:hover:not(.active) { color: var(--text); }

.history-content { flex: 1; overflow-y: auto; }
.history-tab-content { display: none; }
.history-tab-content.active { display: block; }
.history-loading { padding: 32px; text-align: center; color: var(--text-muted); font-size: .84rem; }
.history-empty { padding: 32px; text-align: center; color: var(--text-muted); font-size: .84rem; }

.history-list { padding: 12px 16px; }
.history-item {
  display: flex; align-items: flex-start; gap: 12px;
  padding: 14px 16px; margin-bottom: 10px;
  background: #fff; border-radius: 10px;
  border: 1px solid var(--border);
  box-shadow: 0 1px 4px rgba(0,0,0,.04);
  transition: box-shadow .15s, transform .15s;
}
.history-item:hover {
  box-shadow: 0 2px 10px rgba(0,0,0,.08);
  transform: translateY(-1px);
}
.history-index {
  flex-shrink: 0;
  width: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.history-number {
  flex-shrink: 0;
  width: 28px; height: 28px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  font-size: .78rem; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
  line-height: 1;
}
.history-index.is-shadowed .history-number {
  background: var(--success);
}
.history-shadowed-tag {
  font-size: .8rem;
  font-weight: 700;
  color: var(--success);
  white-space: nowrap;
  line-height: 1;
}
.history-body { flex: 1; min-width: 0; }
.history-clip-steps {
  display: flex; flex-direction: row; flex-wrap: wrap;
  align-items: center; gap: 10px 14px;
  margin-bottom: 10px;
}
.history-clip-date {
  margin-left: auto;
  font-size: .76rem; font-weight: 600;
  color: var(--text-muted);
  white-space: nowrap;
  line-height: 1;
}
.history-clip-btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 12px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: #f8fafc;
  color: var(--text);
  font-size: .8rem;
  cursor: pointer;
  line-height: 1;
}
.history-clip-btn svg { flex-shrink: 0; }
.history-clip-btn[data-action="play-history"] {
  background: #1e293b; color: #fff; border-color: #1e293b;
}
.history-clip-btn[data-action="play-history"]:hover:not(:disabled) { background: #0f172a; }
.history-clip-btn[data-action="play-history"].is-playing { box-shadow: 0 0 0 3px rgba(30, 41, 59, .18); }
.history-clip-btn[data-action="record-history"]:hover:not(:disabled) { background: #eef2ff; border-color: #c7d2fe; }
.history-clip-btn.recording {
  background: #b91c1c; color: #fff; border-color: #b91c1c;
  animation: history-rec-pulse 1s ease infinite;
}
.history-clip-btn.scoring { opacity: .7; cursor: wait; }
.history-clip-btn:disabled { opacity: .45; cursor: not-allowed; }
@keyframes history-rec-pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(185, 28, 28, .35); }
  50% { box-shadow: 0 0 0 6px rgba(185, 28, 28, 0); }
}
.history-result {
  margin-bottom: 10px;
  margin-left: calc(-12px - 28px);
  width: calc(100% + 12px + 28px);
  padding: 10px 12px;
  border-radius: 8px;
  background: #f8fafc;
  border: 1px solid var(--border);
}
.history-result-row { margin-bottom: 8px; }
.history-result-label {
  display: block;
  font-size: .72rem; font-weight: 700;
  color: var(--text-muted);
  margin-bottom: 2px;
  letter-spacing: .04em;
}
.history-result-original {
  margin: 0;
  font-size: .86rem;
  line-height: 1.45;
  white-space: nowrap;
}
.history-result-heard {
  margin: 0;
  font-size: .86rem;
  line-height: 1.55;
  word-break: break-word;
}
.history-diff-hit {
  color: #2f6b4f;
}
.history-diff-miss {
  color: #b42318;
  font-weight: 700;
}
.history-score {
  font-size: .8rem; font-weight: 700;
  margin-top: 2px;
}
.history-score.is-low { color: #b91c1c; }
.history-score.is-ok { color: #b45309; }
.history-score.is-good { color: var(--success); }
.history-score.is-great { color: #c026d3; }
.history-progress {
  display: flex; align-items: center; gap: 8px;
  margin-bottom: 6px;
}
.progress-bar {
  flex: 1; height: 5px; border-radius: 3px;
  background: #e2e8f0; overflow: hidden;
}
.progress-fill {
  height: 100%; border-radius: 3px; transition: width .3s;
}
.progress-fill.low { background: var(--warning); }
.progress-fill.half { background: var(--primary); }
.progress-fill.full { background: var(--success); }
.progress-label {
  font-size: .76rem; font-weight: 600; color: var(--text-muted);
  white-space: nowrap;
}
.history-delete {
  flex-shrink: 0;
  width: 28px; height: 28px;
  border: 0; border-radius: 6px;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: all .15s;
  margin-top: 2px;
}
.history-delete:hover {
  background: var(--danger-bg); color: var(--danger);
}

.shadow-stat {
  display: flex; align-items: center; gap: 12px;
  padding: 12px 14px; margin-bottom: 8px;
  background: #f8fafc; border-radius: 10px; border: 1px solid var(--border);
}
.shadow-stat-label {
  flex: 0 0 auto; font-weight: 700; color: var(--text); white-space: nowrap;
}
.shadow-stat-text {
  flex: 1; min-width: 0; color: var(--text-secondary); font-size: .88rem;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.shadow-stat-score {
  flex: 0 0 auto; font-size: 1.05rem; font-weight: 700; font-variant-numeric: tabular-nums;
}
.shadow-stat-score.high { color: var(--success); }
.shadow-stat-score.mid { color: var(--warning); }
.shadow-stat-score.low { color: var(--danger); }
.shadow-stat-date {
  flex: 0 0 auto; color: var(--text-muted); font-size: .78rem; white-space: nowrap;
}

.history-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,.25);
  z-index: 99;
}
.history-fireworks {
  position: fixed; inset: 0; z-index: 180;
  pointer-events: none;
}
.history-item.is-fx-low { animation: history-fx-shake .55s ease; }
.history-item.is-fx-ok { animation: history-fx-warm .7s ease; }
.history-item.is-fx-good { animation: history-fx-glow .75s ease; }
.history-item.is-fx-great { animation: history-fx-pop .85s ease; }
@keyframes history-fx-shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-4px); }
  40% { transform: translateX(4px); }
  60% { transform: translateX(-3px); }
  80% { transform: translateX(2px); }
}
@keyframes history-fx-warm {
  0%, 100% { box-shadow: 0 1px 4px rgba(0,0,0,.04); }
  40% { box-shadow: 0 0 0 4px rgba(245, 158, 11, .22); }
}
@keyframes history-fx-glow {
  0%, 100% { box-shadow: 0 1px 4px rgba(0,0,0,.04); }
  40% { box-shadow: 0 0 0 5px rgba(79, 106, 92, .28); transform: translateY(-2px); }
}
@keyframes history-fx-pop {
  0%, 100% { box-shadow: 0 1px 4px rgba(0,0,0,.04); transform: scale(1); }
  35% { box-shadow: 0 0 0 8px rgba(192, 38, 211, .18); transform: scale(1.03); }
}

/* ══ Vocabulary selection tokens ══ */
.selectable-text .token {
  cursor: pointer;
  border-radius: 5px;
  padding: 1px 2px;
  transition: background .1s, color .1s;
  user-select: none;
}
.selectable-text .token:hover { background: #e6ebe8; }
.selectable-text .token.sel {
  background: var(--primary);
  color: #fff;
}

/* ══ Vocab selection toolbar ══ */
.vocab-toolbar {
  position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%);
  z-index: 150;
  display: flex; align-items: center; gap: 12px;
  padding: 12px 18px;
  background: #0f172a; color: #e2e8f0;
  border-radius: 14px;
  box-shadow: 0 12px 40px rgba(0,0,0,.28);
  max-width: 92vw;
  animation: toolbar-pop .18s ease;
}
@keyframes toolbar-pop {
  from { opacity: 0; transform: translate(-50%, 12px); }
  to { opacity: 1; transform: translate(-50%, 0); }
}
.vocab-toolbar-label { font-size: .74rem; color: #94a3b8; white-space: nowrap; }
.vocab-toolbar-phrase {
  font-size: .98rem; font-weight: 600; color: #fff;
  max-width: 42vw; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.vocab-toolbar .vocab-save {
  padding: 8px 16px; border: 0; border-radius: 9px;
  background: var(--primary); color: #fff; cursor: pointer;
  font-size: .86rem; white-space: nowrap;
}
.vocab-toolbar .vocab-save:hover { background: var(--primary-hover); }
.vocab-toolbar .vocab-save:disabled { opacity: .5; cursor: not-allowed; }
.vocab-toolbar .vocab-cancel {
  padding: 8px 12px; border: 0; border-radius: 9px;
  background: transparent; color: #94a3b8; cursor: pointer; font-size: .82rem;
}
.vocab-toolbar .vocab-cancel:hover { color: #fff; }
.vocab-toolbar-status { font-size: .78rem; color: #7dd3fc; white-space: nowrap; }

/* ══ Corpus overlay ══ */
.corpus-overlay {
  position: fixed; inset: 0; z-index: 160;
  background: rgba(15,23,42,.5);
  display: flex; align-items: center; justify-content: center;
  padding: 16px 12px;
  opacity: 0; transition: opacity .22s ease;
}
.corpus-overlay.show { opacity: 1; }
.corpus-overlay.is-dictating {
  padding: 0;
  background: var(--card-bg);
}
.corpus-overlay.is-dictating .corpus-modal {
  width: 100%;
  max-width: none;
  height: 100%;
  border-radius: 0;
  box-shadow: none;
}
.corpus-overlay.is-dictating .corpus-header { display: none; }
.corpus-overlay.is-dictating .corpus-body { flex: 1; }
.corpus-modal {
  width: 1040px; max-width: 98vw; height: min(94vh, 1080px);
  background: var(--card-bg); border-radius: 20px;
  box-shadow: 0 24px 70px rgba(0,0,0,.32);
  display: flex; flex-direction: column; overflow: hidden;
  transform: translateY(14px); transition: transform .22s ease;
}
.corpus-overlay.show .corpus-modal { transform: translateY(0); }
.corpus-header {
  display: flex; align-items: center; gap: 16px;
  padding: 20px 24px; border-bottom: 1px solid var(--border);
}
.corpus-header h2 { font-size: 1.15rem; color: var(--primary); }
.corpus-header h2 span { color: var(--text-secondary); font-weight: 400; font-size: .82rem; margin-left: 8px; }
.corpus-header-end {
  display: flex; align-items: center; gap: 16px;
  margin-left: auto;
}
.corpus-reset {
  border: 1px solid var(--border); background: #f4f5f7;
  color: var(--text-secondary); font-size: .78rem; font-weight: 600;
  padding: 6px 12px; border-radius: 999px; cursor: pointer;
  white-space: nowrap;
}
.corpus-reset:hover { background: #eceef2; color: var(--text); }
.corpus-stats {
  display: flex; gap: 18px;
  font-size: .78rem; color: var(--text-muted);
}
.corpus-stats strong { color: var(--text); font-size: .95rem; }
.corpus-actions {
  display: flex; gap: 12px; padding: 16px 24px 4px;
}
.corpus-action {
  padding: 12px 20px; border: 0; border-radius: 12px;
  font-size: .92rem; font-weight: 600; cursor: pointer;
  display: flex; align-items: center; gap: 6px;
}
.corpus-action.flash {
  background: var(--warning-bg); color: #7a5c32;
  border: 1px solid #d9c4a0;
}
.corpus-action.flash:hover { background: #efe6d6; }
.corpus-action.dictation {
  background: #eef1f5; color: var(--primary);
  border: 1px solid var(--border);
}
.corpus-action.dictation:hover { background: #e4e9f0; }
.corpus-action.speak {
  background: var(--primary); color: #fff;
}
.corpus-action.speak:hover { background: var(--primary-hover); }
.corpus-action.speak span {
  font-size: .68rem; font-weight: 500; opacity: .7; margin-left: 2px;
}
.corpus-action:disabled { opacity: .55; cursor: not-allowed; }
.corpus-body { flex: 1; overflow: hidden; display: flex; flex-direction: column; }
.corpus-list-view { flex: 1; overflow-y: auto; padding: 12px 24px 24px; }
.corpus-loading, .corpus-empty {
  text-align: center; color: var(--text-muted); font-size: .86rem;
  padding: 48px 16px; line-height: 1.8;
}
.corpus-list { display: flex; flex-direction: column; gap: 10px; }
.corpus-item {
  display: flex; align-items: flex-start; gap: 12px;
  padding: 16px 16px 14px; background: #fff;
  border: 1px solid var(--border); border-radius: 16px;
  transition: box-shadow .15s, transform .15s;
}
.corpus-item:hover { box-shadow: var(--shadow-md); transform: translateY(-1px); }
.corpus-item.tap-flip { animation: corpus-tap-flip .38s ease; }
@keyframes corpus-tap-flip {
  0% { transform: rotateY(0); }
  42% { transform: rotateY(12deg) scale(.985); }
  100% { transform: rotateY(0); }
}
.corpus-item-body { flex: 1; min-width: 0; cursor: pointer; }
.corpus-item-top {
  display: flex; align-items: flex-start; justify-content: space-between; gap: 12px;
}
.corpus-text { font-size: 1.02rem; font-weight: 600; color: var(--text); margin-bottom: 3px; }
.corpus-meaning { font-size: .85rem; color: var(--text-secondary); }
.corpus-practice {
  display: grid; grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px; margin-top: 12px;
}
.practice-btn {
  border-radius: 12px; padding: 8px 10px 9px; text-align: left;
  cursor: pointer; border: 1px solid transparent;
  display: flex; flex-direction: column; gap: 4px;
  transition: transform .12s, box-shadow .12s, background .12s;
}
.practice-btn:hover { transform: translateY(-1px); box-shadow: var(--shadow-sm); }
.practice-btn:active { transform: translateY(0); }
.practice-lab {
  font-size: .68rem; font-weight: 700; letter-spacing: .04em;
}
.practice-nums {
  font-size: .78rem; font-weight: 600; line-height: 1.35;
  font-variant-numeric: tabular-nums;
}
.practice-btn.flash {
  background: var(--warning-bg); color: #7a5c32; border-color: #d9c4a0;
}
.practice-btn.dict {
  background: #eef1f5; color: var(--primary); border-color: var(--border);
}
.practice-btn.speak {
  background: var(--success-bg); color: var(--success); border-color: var(--success-border);
}
@media (max-width: 720px) {
  .corpus-practice { grid-template-columns: 1fr; }
}
.corpus-badge {
  flex-shrink: 0;
  font-size: .72rem; padding: 2px 9px; border-radius: 10px;
  background: #f1f5f9; color: var(--text-muted);
}
.corpus-badge.status-new { background: #f1f2f4; color: var(--text-muted); }
.corpus-badge.status-learning { background: #eef1f5; color: var(--primary); }
.corpus-badge.status-review { background: #eef1f5; color: #44516a; }
.corpus-badge.status-weak { background: var(--danger-bg); color: var(--danger); }
.corpus-badge.status-mastered { background: var(--success-bg); color: var(--success); }
.corpus-count { font-size: .76rem; font-weight: 600; }
.corpus-count.ok { color: var(--success); }
.corpus-count.no { color: var(--danger); }
.corpus-del {
  flex-shrink: 0; width: 28px; height: 28px;
  border: 0; border-radius: 6px; background: transparent;
  color: var(--text-muted); cursor: pointer;
  display: flex; align-items: center; justify-content: center; transition: all .15s;
}
.corpus-del:hover { background: var(--danger-bg); color: var(--danger); }

/* ══ 10s flash cards ══ */
.corpus-flash-view, .corpus-dict-view { flex: 1; overflow-y: auto; padding: 8px 24px 28px; }
.corpus-overlay.is-dictating .corpus-dict-view {
  display: flex;
  align-items: stretch;
  justify-content: center;
  padding: 0;
}
.corpus-overlay.is-dictating .corpus-dict-view .flash-shell {
  width: 100%;
  min-height: 100%;
  justify-content: center;
}
.flash-loading { text-align: center; color: var(--text-muted); font-size: .9rem; padding: 60px 16px; }
.flash-shell { display: flex; flex-direction: column; align-items: center; perspective: 1200px; }
.flash-topbar {
  width: 100%; display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 12px;
}
.flash-exit {
  border: 0; background: transparent; color: var(--text-secondary);
  font-size: .84rem; cursor: pointer; padding: 6px 4px;
}
.flash-exit:hover { color: var(--text); }
.flash-progress { font-size: .82rem; color: var(--text-muted); font-weight: 600; }
.flash-card {
  position: relative; width: 100%; max-width: 460px;
  min-height: 320px; margin: 8px auto 0;
  background: linear-gradient(160deg, #ffffff, #f8fafc);
  border: 1px solid var(--border); border-radius: 20px;
  box-shadow: var(--shadow-md);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 20px; padding: 32px 28px; cursor: pointer;
  transform-style: preserve-3d;
  transition: box-shadow .2s ease, border-color .2s ease;
}
.flash-card.appear { animation: flash-deal .4s cubic-bezier(.2,.8,.2,1); }
@keyframes flash-deal {
  from { opacity: 0; transform: rotateY(-62deg) scale(.94); }
  to { opacity: 1; transform: none; }
}
.flash-card.flipping { animation: flash-flip-out .17s ease forwards; }
@keyframes flash-flip-out {
  to { transform: rotateY(88deg) scale(.96); }
}
.flash-card.flipped { animation: flash-settle .34s ease; }
@keyframes flash-settle {
  from { transform: rotateY(-14deg) scale(.98); }
  to { transform: none; }
}
.flash-card.remembered {
  border-color: var(--success-border);
  box-shadow: 0 0 0 3px rgba(79, 106, 92, .16), var(--shadow-md);
  animation: flash-yes .5s cubic-bezier(.2,.8,.2,1);
}
@keyframes flash-yes {
  0% { transform: scale(1); }
  30% { transform: scale(1.045) translateY(-7px); }
  100% { transform: scale(1); }
}
.flash-card.forgot {
  border-color: var(--danger-border);
  box-shadow: 0 0 0 3px rgba(180, 80, 70, .14), var(--shadow-md);
  animation: flash-no .48s ease;
}
@keyframes flash-no {
  0%, 100% { transform: translateX(0); }
  18% { transform: translateX(-11px) rotate(-1.4deg); }
  36% { transform: translateX(9px) rotate(1.2deg); }
  54% { transform: translateX(-6px); }
  72% { transform: translateX(3px); }
}
.flash-card.remembered::after,
.flash-card.forgot::after {
  position: absolute; left: 16px; top: 14px;
  width: 34px; height: 34px; border-radius: 50%;
  display: grid; place-items: center;
  font-size: 1.05rem; font-weight: 700;
  pointer-events: none;
  animation: flash-stamp .45s ease;
}
.flash-card.remembered::after { content: "✓"; color: var(--success); background: var(--success-bg); }
.flash-card.forgot::after { content: "✗"; color: var(--danger); background: var(--danger-bg); }
@keyframes flash-stamp {
  0% { opacity: 0; transform: scale(.4) rotate(-18deg); }
  55% { opacity: 1; transform: scale(1.12) rotate(0); }
  100% { opacity: 1; transform: scale(1); }
}
.flash-ring { position: relative; width: 120px; height: 120px; display: grid; place-items: center; }
.flash-ring svg { position: absolute; inset: 0; }
.flash-ring-bg { fill: none; stroke: #e2e8f0; stroke-width: 7; }
.flash-ring-fg {
  fill: none; stroke: var(--warning); stroke-width: 7;
  stroke-linecap: round; transition: stroke-dashoffset .1s linear;
}
.flash-ring.done .flash-ring-fg { stroke: var(--success); }
.flash-count { font-size: 1.9rem; font-weight: 700; color: var(--text-secondary); }
.flash-ring.done .flash-count { color: var(--success); }
.flash-face { text-align: center; }
.flash-front { font-size: 1.7rem; font-weight: 700; color: var(--primary); line-height: 1.35; }
.flash-back { font-size: 1.5rem; font-weight: 600; color: var(--text); line-height: 1.4; }
.flash-speak {
  position: absolute; top: 14px; right: 14px;
  width: 38px; height: 38px; border: 0; border-radius: 50%;
  background: #f3f4f7; color: var(--primary); font-size: 1.05rem; cursor: pointer;
}
.flash-speak:hover { background: #e8eaee; }
.flash-hint { margin-top: 16px; font-size: .84rem; color: var(--text-muted); }
.flash-rate { display: flex; gap: 14px; margin-top: 18px; }
.flash-btn {
  padding: 12px 30px; border: 1px solid transparent; border-radius: 999px;
  font-size: .95rem; font-weight: 600; cursor: pointer;
  transition: background .15s, border-color .15s, transform .1s;
}
.flash-btn:hover { filter: none; }
.flash-btn:active { transform: scale(.97); }
.flash-btn:disabled { opacity: .5; cursor: not-allowed; }
.flash-btn.pulse {
  animation: flash-btn-pop .42s ease;
  opacity: 1;
}
.flash-btn.remember.pulse { box-shadow: 0 0 0 6px rgba(79, 106, 92, .12); }
.flash-btn.forgot.pulse { box-shadow: 0 0 0 6px rgba(180, 80, 70, .12); }
@keyframes flash-btn-pop {
  0% { transform: scale(1); }
  35% { transform: scale(1.08); }
  100% { transform: scale(1); }
}
.flash-btn.remember {
  background: var(--success-bg); color: var(--success); border-color: var(--success-border);
}
.flash-btn.remember:hover { background: #e2ebe5; }
.flash-btn.forgot {
  background: var(--danger-bg); color: var(--danger); border-color: var(--danger-border);
}
.flash-btn.forgot:hover { background: #eadeda; }
.flash-btn.ghost { background: #f4f5f7; color: var(--text-secondary); border-color: var(--border); }
.flash-summary {
  max-width: 460px; margin: 24px auto 0; text-align: center;
  background: #fff; border: 1px solid var(--border); border-radius: 20px;
  padding: 36px 28px; box-shadow: var(--shadow-md);
}
.flash-summary-icon { font-size: 2.4rem; }
.flash-summary h3 { margin: 8px 0 18px; font-size: 1.2rem; }
.flash-summary-stats { display: flex; justify-content: center; gap: 40px; margin-bottom: 16px; }
.flash-stat { display: flex; flex-direction: column; gap: 4px; }
.flash-stat .label { font-size: .78rem; color: var(--text-muted); }
.flash-stat .val { font-size: 1.8rem; font-weight: 700; }
.flash-stat .val.ok { color: var(--success); }
.flash-stat .val.no { color: var(--danger); }
.flash-summary-tip { font-size: .82rem; color: var(--text-muted); margin-bottom: 20px; }
.flash-summary-actions { display: flex; gap: 12px; justify-content: center; margin-top: 12px; }

/* ── Login close (optional login) ── */
.login-card { position: relative; }
.login-close {
  position: absolute; top: 14px; right: 14px;
  width: 30px; height: 30px; border: 0; border-radius: 8px;
  background: transparent; color: var(--text-muted); font-size: 1.4rem;
  cursor: pointer; line-height: 1;
}
.login-close:hover { background: #f1f5f9; color: var(--text); }

/* ══ Speaking practice (口语运用) ══ */
.speaking-overlay {
  position: fixed; inset: 0; z-index: 170;
  background: rgba(15,23,42,.55);
  display: flex; align-items: center; justify-content: center;
  padding: 14px 10px;
  opacity: 0; transition: opacity .22s ease;
}
.speaking-overlay.show { opacity: 1; }
.speaking-modal {
  width: 1240px; max-width: 98vw; height: min(95vh, 1160px);
  background: #f7f8fc; border-radius: 22px;
  box-shadow: 0 26px 74px rgba(0,0,0,.34);
  display: flex; flex-direction: column; overflow: hidden;
  transform: translateY(16px); transition: transform .22s ease;
}
.speaking-overlay.show .speaking-modal { transform: translateY(0); }

.speaking-header {
  display: flex; align-items: center; gap: 12px;
  padding: 18px 22px;
  background: #3f4a5c;
  color: #f4f5f7;
}
.speaking-head-left { display: flex; align-items: baseline; gap: 10px; }
.speaking-header h2 { font-size: 1.1rem; font-weight: 700; }
.speaking-topic { font-size: .84rem; opacity: .92; }
.speaking-progress { margin-left: auto; font-size: .78rem; opacity: .9; }
.speaking-rate {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: .78rem; font-weight: 600; opacity: .95;
  white-space: nowrap;
}
.speaking-rate select {
  border: 0; border-radius: 8px; padding: 4px 8px;
  background: rgba(255,255,255,.2); color: #fff;
  font-size: .78rem; font-weight: 600; cursor: pointer;
}
.speaking-rate select option { color: #1f2937; }
.speaking-header .close-btn { color: #fff; }
.speaking-header .close-btn:hover { background: rgba(255,255,255,.18); }

.speaking-targets {
  display: flex; flex-wrap: wrap; gap: 8px;
  padding: 14px 22px; background: #fff;
  border-bottom: 1px solid var(--border);
}
.target-chip {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 7px 13px; border-radius: 999px;
  background: #f3f4f6; color: #6b7280;
  border: 1px solid #e5e7eb;
  font-size: .9rem; font-weight: 600;
  transition: all .18s ease; opacity: .82;
}
.target-chip .chip-zh { font-size: .74rem; font-weight: 500; color: #9ca3af; }
.target-chip .chip-count { font-size: .7rem; font-weight: 600; color: #9ca3af; margin-left: 2px; }
/* 出现过：点亮 */
.target-chip.lit {
  background: #eef1f5; color: var(--primary); border-color: #c5ccd8; opacity: 1;
  box-shadow: 0 0 0 3px rgba(68, 81, 106, .08);
}
.target-chip.lit .chip-zh { color: #6a7588; }
.target-chip.lit .chip-count { color: #6a7588; }
.target-chip.done {
  background: var(--success-bg); color: var(--success); border-color: var(--success-border); opacity: 1;
  box-shadow: 0 0 0 3px rgba(79, 106, 92, .1);
}
.target-chip.done .chip-zh { color: #6b8576; }
.target-chip.done .chip-count { color: #6b8576; }

.speaking-chat {
  flex: 1; overflow-y: auto; padding: 20px 22px;
  display: flex; flex-direction: column; gap: 14px;
}
.speaking-loading {
  margin: auto; color: var(--text-muted); font-size: .88rem;
}
.speaking-group-chooser { padding: 18px 4px 24px; }
.speaking-chooser-title { color: var(--text); font-size: 1.05rem; font-weight: 700; text-align: center; }
.speaking-chooser-copy { margin: 8px 0 18px; color: var(--text-muted); font-size: .86rem; text-align: center; }
.speaking-group-list { display: grid; gap: 10px; }
.speaking-group-card {
  display: block; width: 100%; padding: 14px 16px; border: 1px solid var(--border);
  border-radius: 14px; background: #fff; color: var(--text); text-align: left; cursor: pointer;
  transition: border-color .18s ease, box-shadow .18s ease, transform .18s ease;
}
.speaking-group-card:hover { border-color: var(--primary); box-shadow: 0 5px 16px rgba(40, 90, 140, .12); transform: translateY(-1px); }
.speaking-group-card-head, .speaking-group-card-targets, .speaking-group-card-action { display: flex; align-items: center; }
.speaking-group-card-head { justify-content: space-between; gap: 12px; color: var(--text-muted); font-size: .84rem; }
.speaking-group-card-head strong { color: var(--text); }
.speaking-group-card-targets { flex-wrap: wrap; gap: 7px; margin-top: 12px; }
.speaking-group-target { display: inline-flex; flex-direction: column; gap: 2px; padding: 6px 9px; border-radius: 8px; background: var(--surface-muted, #f4f6f8); font-size: .9rem; }
.speaking-group-target small { color: var(--text-muted); font-size: .72rem; }
.speaking-group-card-action { justify-content: flex-end; margin-top: 10px; color: var(--primary); font-size: .8rem; }
.bubble-row { display: flex; align-items: flex-start; position: relative; }
.bubble-row.ai { justify-content: flex-start; gap: 8px; }
.bubble-row.user { justify-content: flex-end; }
.bubble {
  max-width: min(72%, 640px); padding: 12px 16px; border-radius: 16px;
  font-size: .98rem; line-height: 1.6; position: relative;
  box-shadow: var(--shadow-sm);
}
.bubble.ai {
  background: #fff; color: var(--text);
  border-bottom-left-radius: 5px;
}
.bubble.user {
  background: var(--primary); color: #fff;
  border-bottom-right-radius: 5px;
}
.bubble.user.draft {
  background: #5b6880;
  box-shadow: inset 0 0 0 1px rgba(255,255,255,.22);
}
.bubble.user.draft .bubble-text {
  min-width: 8ch; outline: none;
}
.bubble.user.draft .bubble-text:empty::before {
  content: "正在听…";
  opacity: .55;
}
.bubble mark.tgt {
  padding: 0 3px; border-radius: 4px; font-weight: 700;
  -webkit-box-decoration-break: clone; box-decoration-break: clone;
}
.bubble.ai mark.tgt { background: #e6ebe8; color: var(--success); }
.bubble.user mark.tgt { background: rgba(255,255,255,.28); color: #fff; }
.bubble-zh {
  margin-top: 6px; padding-top: 6px; border-top: 1px dashed var(--border);
  font-size: .82rem; color: var(--text-secondary);
}
.bubble-tools { display: flex; gap: 6px; margin-top: 6px; }
.bubble-btn {
  border: 0; background: #f1f5f9; color: var(--text-secondary);
  border-radius: 7px; padding: 3px 9px; font-size: .78rem; cursor: pointer;
}
.bubble-btn:hover { background: #e2e8f0; }
.bubble-btn.play.loading { opacity: .5; }
.bubble.typing { display: flex; gap: 4px; padding: 14px 16px; }
.bubble.typing span {
  width: 7px; height: 7px; border-radius: 50%; background: #c4c9d4;
  animation: typing 1.2s infinite ease-in-out;
}
.bubble.typing span:nth-child(2) { animation-delay: .18s; }
.bubble.typing span:nth-child(3) { animation-delay: .36s; }
@keyframes typing { 0%,60%,100% { transform: translateY(0); opacity: .5; } 30% { transform: translateY(-5px); opacity: 1; } }

.hint-btn {
  flex: 0 0 auto; align-self: center;
  border: 1px solid var(--border); background: #fff; color: var(--primary);
  border-radius: 999px; padding: 6px 11px;
  font-size: .78rem; font-weight: 700; cursor: pointer;
  box-shadow: var(--shadow-sm); white-space: nowrap;
}
.hint-btn:hover { background: #eef1f5; }
.hint-btn.loading { opacity: .55; cursor: wait; }
.hint-wrap { position: relative; flex: 0 0 auto; align-self: center; }
.speak-hint-pop {
  position: absolute; top: calc(100% + 8px); left: 0; right: auto;
  z-index: 8; width: 300px; max-width: min(300px, 70vw);
  padding: 14px 16px 12px;
  background: var(--warning-bg); color: #7a5c32;
  border: 1px solid #d9c4a0; border-radius: 14px;
  box-shadow: 0 10px 28px rgba(68, 81, 106, .12);
  animation: hintFlicker 1.1s ease-in-out infinite;
}
.speak-hint-pop.hidden { display: none !important; }
.speak-hint-close {
  position: absolute; top: 4px; right: 6px;
  width: 22px; height: 22px; border: 0; border-radius: 6px;
  background: transparent; color: #b45309; font-size: 1.1rem;
  line-height: 1; cursor: pointer;
}
.speak-hint-close:hover { background: rgba(180,83,9,.12); }
.speak-hint-en { font-size: .95rem; font-weight: 700; line-height: 1.5; padding-right: 18px; }
.speak-hint-zh { margin-top: 6px; font-size: .8rem; color: #a16207; }
.speak-hint-loading { font-size: .82rem; color: #b45309; }
@keyframes hintFlicker {
  0%, 100% { box-shadow: 0 0 0 0 rgba(245,158,11,.35); }
  50% { box-shadow: 0 0 0 6px rgba(245,158,11,.08); }
}

.speaking-inputbar {
  display: flex; align-items: center; gap: 10px;
  padding: 14px 22px; background: #fff; border-top: 1px solid var(--border);
}
.mic-btn {
  width: 46px; height: 46px; flex: 0 0 46px; border: 0; border-radius: 50%;
  background: #eef1f5; color: var(--primary); cursor: pointer;
  font-size: 1.2rem; display: flex; align-items: center; justify-content: center;
  transition: all .18s ease;
}
.mic-btn:hover { background: #e3e7ee; }
.mic-btn.recording {
  background: var(--danger); color: #fff;
  animation: micpulse 1.3s infinite;
}
.mic-btn.recognizing { background: var(--warning); color: #fff; }
.mic-btn:disabled { opacity: .5; cursor: not-allowed; }
@keyframes micpulse {
  0% { box-shadow: 0 0 0 0 rgba(138, 91, 83, .45); }
  70% { box-shadow: 0 0 0 12px rgba(138, 91, 83, 0); }
  100% { box-shadow: 0 0 0 0 rgba(138, 91, 83, 0); }
}
.speaking-inputbar input {
  flex: 1; padding: 12px 16px; border: 1px solid var(--border);
  border-radius: 12px; font-size: .95rem; outline: none;
  transition: border-color .15s;
}
.speaking-inputbar input:focus { border-color: var(--primary); }
.send-btn {
  padding: 11px 20px; border: 0; border-radius: 12px;
  background: var(--primary); color: #fff;
  font-size: .92rem; font-weight: 600; cursor: pointer;
}
.send-btn:hover { background: var(--primary-hover); }
.send-btn:disabled, .speaking-inputbar input:disabled { opacity: .55; cursor: not-allowed; }

.speaking-footer {
  display: flex; align-items: center; gap: 12px;
  padding: 12px 22px 16px; background: #fff;
}
.speaking-hint { font-size: .82rem; color: var(--text-muted); flex: 1; }
.speaking-hint.done { color: var(--success); }
.speaking-foot-actions { display: flex; gap: 10px; }
.speaking-next {
  padding: 9px 16px; border: 0; border-radius: 10px;
  background: #eef1f5; color: var(--primary); font-weight: 600;
  font-size: .86rem; cursor: pointer;
}
.speaking-next:hover { background: #e3e7ee; }
.speaking-end {
  padding: 9px 16px; border: 1px solid var(--border); border-radius: 10px;
  background: transparent; color: var(--text-secondary);
  font-size: .86rem; cursor: pointer;
}
.speaking-end:hover { background: var(--danger-bg); color: var(--danger); border-color: var(--danger); }

/* ══ Dictation ══ */
.dict-shell {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: min(960px, 100%);
  min-height: 100%;
  margin: 0 auto;
  padding: 88px 40px 72px;
  box-sizing: border-box;
}
.dict-shell .flash-topbar {
  position: absolute;
  top: 22px;
  left: 28px;
  right: 28px;
  width: auto;
  margin: 0;
}
.dict-shell .flash-exit { font-size: 1rem; }
.dict-shell .flash-progress { font-size: 1rem; }
.dict-shell.win::after {
  content: "";
  position: absolute;
  inset: 12% 8%;
  background: radial-gradient(circle, rgba(79, 106, 92, .16), transparent 68%);
  pointer-events: none;
  animation: dict-glow 1.6s ease forwards;
}
.dict-prompt {
  font-size: clamp(1.8rem, 3.4vw, 2.45rem); font-weight: 700; color: var(--text);
  text-align: center; margin: 0 0 44px; line-height: 1.45;
  max-width: 18em;
}
.dict-slots {
  display: flex; flex-wrap: wrap; justify-content: center;
  gap: 22px 28px; max-width: 880px;
}
.dict-slot {
  border: 0; border-bottom: 3px solid var(--text);
  background: transparent; outline: none;
  font-size: clamp(1.45rem, 2.4vw, 1.9rem); font-weight: 600; color: var(--text);
  text-align: center; padding: 8px 4px 10px;
  min-width: 3ch;
}
.dict-slot:focus { border-bottom-color: var(--primary); }
.dict-slot.wrong { border-bottom-color: var(--danger); color: var(--danger); animation: dict-shake .28s ease; }
.dict-slot.ok { border-bottom-color: var(--success); color: var(--success); }
.dict-reveal {
  margin-top: 28px;
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--primary);
  letter-spacing: .03em;
  text-align: center;
}
.dict-hint { margin-top: 28px; font-size: 1.02rem; color: var(--text-muted); text-align: center; max-width: 640px; line-height: 1.55; }
.dict-hint.bad { color: var(--danger); }
.dict-actions { margin-top: 28px; display: flex; gap: 16px; justify-content: center; }
.dict-actions .flash-btn {
  min-width: 148px;
  padding: 14px 32px;
  font-size: 1.12rem;
}
@keyframes dict-shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-4px); }
  75% { transform: translateX(4px); }
}
@keyframes dict-glow {
  0% { opacity: 0; }
  30% { opacity: 1; }
  100% { opacity: 0; }
}
.dict-confetti {
  position: fixed; inset: 0; z-index: 400; pointer-events: none;
}
.dict-yes {
  position: absolute;
  top: 38%;
  left: 50%;
  z-index: 2;
  padding: 8px 22px;
  border: 3px solid var(--success);
  border-radius: 14px;
  background: rgba(251, 251, 252, .88);
  color: var(--success);
  font-size: 2.6rem;
  font-weight: 800;
  letter-spacing: .18em;
  pointer-events: none;
  animation: dict-yes-pop 1.65s ease forwards;
}
@keyframes dict-yes-pop {
  0% { opacity: 0; transform: translate(-50%, -50%) scale(.45) rotate(-8deg); }
  16% { opacity: 1; transform: translate(-50%, -50%) scale(1.08) rotate(-2deg); }
  30% { transform: translate(-50%, -50%) scale(1) rotate(-3deg); }
  72% { opacity: 1; }
  100% { opacity: 0; transform: translate(-50%, -50%) scale(1.05) rotate(-3deg); }
}
@media (prefers-reduced-motion: reduce) {
  .dict-slot.wrong { animation: none; }
  .dict-shell.win::after, .dict-yes { animation: none; opacity: 1; }
  .flash-card.appear,
  .flash-card.flipping,
  .flash-card.flipped,
  .flash-card.remembered,
  .flash-card.forgot,
  .flash-card.remembered::after,
  .flash-card.forgot::after,
  .flash-btn.pulse,
  .corpus-item.tap-flip { animation: none; transform: none; }
}

.heart-overlay {
  position: fixed; inset: 0; z-index: 110;
  display: flex; align-items: center; justify-content: center;
  padding: 24px 16px;
  background:
    radial-gradient(900px 420px at 12% -10%, rgba(68, 81, 106, .10), transparent 56%),
    var(--canvas);
}
.heart-overlay.hidden { display: none; }
.heart-shell {
  width: min(560px, 100%);
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 22px;
  padding: 28px 26px 24px;
  box-shadow: var(--shadow-md);
}
.heart-header {
  display: flex; align-items: flex-start; gap: 12px;
  margin-bottom: 14px;
}
.heart-header h2 {
  font-size: 1.35rem; color: var(--primary); font-weight: 700; letter-spacing: .02em;
}
.heart-kicker {
  font-size: .72rem; letter-spacing: .16em; text-transform: uppercase;
  color: var(--text-muted); margin-bottom: 4px;
}
.heart-theme {
  margin-left: auto;
  display: flex; background: #eceff3; border-radius: 999px; padding: 3px;
}
.heart-theme button {
  border: 0; background: transparent; color: var(--text-secondary);
  padding: 6px 12px; border-radius: 999px; cursor: pointer; font-size: .8rem; font-weight: 600;
}
.heart-theme button.is-active {
  background: #fff; color: var(--primary); box-shadow: var(--shadow-sm);
}
.heart-lead {
  color: var(--text-secondary); font-size: .95rem; line-height: 1.65; margin-bottom: 18px;
}
.heart-mic {
  width: 100%; display: flex; align-items: center; justify-content: center; gap: 10px;
  padding: 16px 18px; margin-bottom: 14px;
  border: 1px dashed #c5ccd6; border-radius: 16px;
  background: #f7f8fa; color: var(--primary); cursor: pointer;
  font-size: 1rem; font-weight: 600;
}
.heart-mic:hover { background: #eef1f5; }
.heart-mic.recording {
  border-style: solid; border-color: #8a5b53; background: #f7eeec; color: #8a5b53;
}
.heart-mic-icon {
  width: 12px; height: 12px; border-radius: 50%; background: currentColor;
  box-shadow: 0 0 0 6px rgba(68, 81, 106, .08);
}
.heart-mic.recording .heart-mic-icon {
  animation: heart-pulse 1.1s ease-in-out infinite;
}
@keyframes heart-pulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.25); opacity: .65; }
}
#heart-text {
  width: 100%; min-height: 132px; resize: vertical;
  padding: 14px 16px; border: 1px solid var(--border); border-radius: 14px;
  background: #fff; color: var(--text); font: inherit; line-height: 1.55;
  outline: none;
}
#heart-text:focus { border-color: var(--primary); }
.heart-status {
  min-height: 1.3em; margin: 10px 0 14px; color: var(--text-muted); font-size: .86rem;
}
.heart-make {
  width: 100%; padding: 13px 16px; border: 0; border-radius: 12px;
  background: var(--primary); color: #fff; cursor: pointer;
  font-size: 1rem; font-weight: 650;
}
.heart-make:hover { background: var(--primary-hover); }
.heart-make:disabled { opacity: .55; cursor: not-allowed; }

body.heart-private {
  color-scheme: dark;
  --canvas: #0B1220;
  --primary: #c5d2ea;
  --primary-hover: #d7e1f4;
  --success: #8fbfa6;
  --success-bg: #163024;
  --success-border: #2a4b3c;
  --danger: #d4a39a;
  --danger-bg: #2a1c1a;
  --danger-border: #4a322e;
  --warning: #d2b07a;
  --warning-bg: #2a2316;
  --card-bg: #121a2c;
  --border: #243049;
  --text: #e8edf6;
  --text-secondary: #b4bdd0;
  --text-muted: #7d89a3;
  --shadow-md: 0 16px 40px rgba(0, 0, 0, .35);
  background:
    radial-gradient(900px 480px at 8% -10%, rgba(80, 110, 170, .18), transparent 55%),
    #0B1220;
}
body.heart-private .heart-theme { background: #1a2438; }
body.heart-private .heart-theme button.is-active { background: #243049; color: #e8edf6; }
body.heart-private .heart-mic { background: #161f33; border-color: #2c3b57; color: #c5d2ea; }
body.heart-private .heart-mic:hover { background: #1b2740; }
body.heart-private .heart-mic.recording { background: #2a1c1a; border-color: #d4a39a; color: #d4a39a; }
body.heart-private #heart-text { background: #0f1626; color: #e8edf6; }
body.heart-private .heart-make { background: #c5d2ea; color: #0B1220; }
body.heart-private .heart-make:hover { background: #d7e1f4; }
body.heart-private .topbar,
body.heart-private .full-listen-card,
body.heart-private .sentence-container,
body.heart-private .hub-board {
  background: var(--card-bg);
  border-color: var(--border);
  color: var(--text);
}