* {
  box-sizing: border-box;
}

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

:root {
  --bg: #f6f7fb;
  --text: #0b1220;
  --muted: #5b6477;
  --card: #ffffff;
  --card2: #fbfcff;
  --border: #e7eaf2;
  --border2: #eef1f7;
  --border3: #d8deeb;
  --accent: #0b1220;
  --accentHover: #111a33;
  --accentText: #ffffff;
  --surfaceHover: #f6f7fb;
  --paperBorder: #e1e5f0;
  --shadow: 0 12px 30px rgba(11, 18, 32, 0.08);
  --shadowModal: 0 16px 50px rgba(11, 18, 32, 0.18);
  --wordBg: rgba(11, 18, 32, 0.04);
  --wordBorder: rgba(11, 18, 32, 0.08);
  --backdrop: rgba(11, 18, 32, 0.45);
}

body {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body.theme-dark {
  --bg: #070b16;
  --text: #e7edf8;
  --muted: #a9b3c6;
  --card: #0b1220;
  --card2: #0f1930;
  --border: rgba(231, 234, 242, 0.12);
  --border2: rgba(231, 234, 242, 0.1);
  --border3: rgba(216, 222, 235, 0.18);
  --accent: #e7edf8;
  --accentHover: #ffffff;
  --accentText: #0b1220;
  --surfaceHover: rgba(255, 255, 255, 0.06);
  --paperBorder: rgba(231, 234, 242, 0.14);
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.35);
  --shadowModal: 0 22px 70px rgba(0, 0, 0, 0.55);
  --wordBg: rgba(255, 255, 255, 0.06);
  --wordBorder: rgba(255, 255, 255, 0.12);
  --backdrop: rgba(0, 0, 0, 0.55);
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Arial,
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--bg);
  min-height: 100dvh;
  -webkit-text-size-adjust: 100%;
}

body.no-select {
  user-select: none;
  -webkit-user-select: none;
}

.hidden {
  display: none !important;
}

.app-header {
  display: flex;
  gap: 16px;
  align-items: center;
  justify-content: space-between;
  padding: calc(16px + env(safe-area-inset-top)) calc(16px + env(safe-area-inset-right)) 8px
    calc(16px + env(safe-area-inset-left));
  max-width: 1100px;
  margin: 0 auto;
}

.title h1 {
  margin: 0;
  font-size: 20px;
}

.subtitle {
  margin: 4px 0 0;
  font-size: 13px;
  color: var(--muted);
}

.badge {
  padding: 6px 10px;
  border-radius: 999px;
  background: var(--accent);
  color: var(--accentText);
  font-size: 13px;
}

.status {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 6px;
  min-width: 220px;
}

.status-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  width: 100%;
}

.status-entry {
  padding: 6px 10px;
  border-radius: 999px;
  font-size: 13px;
  line-height: 1;
  white-space: nowrap;
}

.status-meta {
  font-size: 12px;
  color: var(--muted);
  text-align: right;
  line-height: 1.2;
}

.status-progress {
  width: 220px;
  height: 6px;
  border-radius: 999px;
  background: rgba(127, 137, 160, 0.22);
  overflow: hidden;
}

.status-progress-bar {
  height: 100%;
  width: 0%;
  background: var(--accent);
}

.app {
  max-width: 1100px;
  margin: 0 auto;
  padding: 8px calc(16px + env(safe-area-inset-right)) calc(24px + env(safe-area-inset-bottom))
    calc(16px + env(safe-area-inset-left));
}

.controls {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
  padding: 10px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
}

.home-controls {
  display: block;
}

.home-controls .controls-row {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
  width: 100%;
}

.home-controls .controls-row + .controls-row {
  margin-top: 10px;
}

.home-controls .controls-row-top {
  align-items: flex-start;
}

.home-controls .controls-row-main {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
  flex: 1 1 auto;
}

.home-controls .controls-row-secondary {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
  margin-left: auto;
}

.home-controls .controls-row-toggles {
  justify-content: flex-end;
}

.home-controls .controls-row-wordbook .select-wrap {
  flex: 1 1 260px;
  min-width: 220px;
}

.immersive .home-controls {
  display: block;
}

.immersive .home-controls .controls-row + .controls-row {
  margin-top: 10px;
}

.records-controls-actions {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.records-controls-top .records-controls-actions {
  margin-left: auto;
}

.records-controls-top .view-tabs button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

@media (min-width: 680px) {
  .home-controls {
    display: grid;
    grid-template-columns: 1fr auto;
    grid-template-areas:
      "top top"
      "wordbook toggles";
    gap: 10px;
    align-items: center;
  }

  .home-controls .controls-row + .controls-row {
    margin-top: 0;
  }

  .home-controls .controls-row-top {
    grid-area: top;
  }

  .home-controls .controls-row-wordbook {
    grid-area: wordbook;
  }

  .home-controls .controls-row-toggles {
    grid-area: toggles;
    justify-content: flex-end;
  }
}

.spacer {
  flex: 1;
}

button {
  -webkit-appearance: none;
  appearance: none;
  border: 1px solid var(--border3);
  background: var(--card);
  color: var(--text);
  padding: 10px 12px;
  border-radius: 10px;
  font-size: 14px;
  line-height: 1;
  font: inherit;
  cursor: pointer;
}

button:hover {
  background: var(--surfaceHover);
}

button:focus-visible,
select:focus-visible,
.button-link:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

button:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

button,
.button-link {
  touch-action: manipulation;
}

button.primary {
  background: var(--accent);
  color: var(--accentText);
  border-color: var(--accent);
}

button.primary:hover {
  background: var(--accentHover);
}

button.ghost {
  background: transparent;
}

button.full {
  width: 100%;
}

.select-wrap {
  display: inline-flex;
  align-items: center;
  flex: 1 1 260px;
  min-width: 220px;
  max-width: 100%;
}

select {
  -webkit-appearance: none;
  appearance: none;
  border: 1px solid var(--border3);
  background: var(--card);
  color: var(--text);
  padding: 10px 36px 10px 12px;
  border-radius: 10px;
  font-size: 14px;
  line-height: 1;
  font: inherit;
  background-image: linear-gradient(45deg, transparent 50%, var(--muted) 50%),
    linear-gradient(135deg, var(--muted) 50%, transparent 50%);
  background-position: calc(100% - 18px) 50%, calc(100% - 12px) 50%;
  background-size: 6px 6px, 6px 6px;
  background-repeat: no-repeat;
  width: 100%;
  max-width: 100%;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

select:hover {
  background-color: var(--surfaceHover);
}

.button-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  border: 1px solid var(--border3);
  background: var(--card);
  color: var(--text);
  padding: 10px 12px;
  border-radius: 10px;
  font-size: 14px;
  line-height: 1;
  font: inherit;
  cursor: pointer;
}

.button-link:hover {
  background: var(--surfaceHover);
}

.button-link.full {
  width: 100%;
}

.stack {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

@media (max-width: 520px) {
  .app-header {
    flex-wrap: wrap;
  }

  .status {
    min-width: 0;
    width: 100%;
    align-items: flex-start;
  }

  .status-top {
    justify-content: space-between;
    flex-wrap: wrap;
  }

  .home-controls {
    padding: 8px;
  }

  .home-controls .controls-row {
    gap: 8px;
  }

  .home-controls .controls-row + .controls-row {
    margin-top: 8px;
  }

  .home-controls button,
  .home-controls .button-link,
  .home-controls select {
    padding: 8px 10px;
    font-size: 13px;
  }

  .status-top #settingsBtn {
    padding: 6px 10px;
    font-size: 13px;
  }

  .records-page .status-top #openSettingsBtn,
  .records-page .status-top #lookupBtn,
  .records-page .status-top .button-link {
    padding: 6px 10px;
    font-size: 13px;
  }

  .home-controls .controls-row-top {
    flex-direction: column;
    align-items: stretch;
  }

  .home-controls .controls-row-secondary {
    width: 100%;
    justify-content: space-between;
  }

  .home-controls .controls-row-main button {
    flex: 1 1 calc(50% - 8px);
  }

  .home-controls .controls-row-wordbook .select-wrap {
    flex: 7 1 0;
    min-width: 0;
  }

  .home-controls .controls-row-wordbook #importWordbookBtn {
    flex: 3 0 0;
    min-width: 0;
  }

  .home-controls .controls-row-wordbook {
    flex-wrap: nowrap;
  }

  .home-controls .controls-row-secondary > * {
    flex: 1 1 0;
  }

  .home-controls .controls-row-toggles {
    justify-content: space-between;
  }

  .home-controls .controls-row-toggles button {
    flex: 1 1 calc(50% - 10px);
  }

  .records-controls-top {
    align-items: stretch;
    flex-direction: column;
  }

  .records-controls-top .view-tabs {
    width: 100%;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
    align-items: stretch;
  }

  .records-controls-top .view-tabs button {
    width: 100%;
  }

  .records-controls-top .records-controls-actions {
    width: 100%;
    display: grid;
    grid-template-columns: 1.2fr 1.2fr 1fr;
    gap: 8px;
    justify-content: initial;
    margin-left: 0;
  }

  .records-controls-top #clearBtn {
    justify-self: stretch;
  }

  .records-controls-top button {
    padding: 8px 10px;
    font-size: 13px;
  }
}

/* Import wordbook modal mobile styles — strictly scoped to #importModal */
@media (max-width: 520px) {
  #importModal .modal-panel {
    max-height: 85vh;
  }

  #importModal .modal-body {
    padding: 10px;
    gap: 10px;
  }

  /* Button area: primary full-width, secondary 2-column */
  #importModal .import-actions {
    gap: 8px;
  }

  #importModal .import-actions button {
    min-height: 44px;
    line-height: 1.2;
    padding: 10px 12px;
    font-size: 14px;
    border-radius: 10px;
  }

  #importModal .import-actions .secondary-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
  }

  #importModal .import-actions .secondary-row button {
    width: 100%;
  }

  /* Wordbook list items: two-tier structure on mobile */
  #importModal .import-manage-row {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 10px 12px;
  }

  #importModal .item-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    min-width: 0;
  }

  #importModal .import-manage-meta {
    font-size: 14px;
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    min-width: 0;
    flex: 1;
  }

  #importModal .import-manage-secondary {
    display: flex;
    gap: 6px;
    flex-shrink: 0;
    align-items: center;
  }

  #importModal .import-manage-secondary button {
    min-height: 32px;
    padding: 4px 10px;
    font-size: 13px;
    border-radius: 8px;
  }

  #importModal .item-primary-action {
    width: 100%;
  }

  #importModal .item-primary-action button[data-action="learn"] {
    width: 100%;
    min-height: 40px;
    font-size: 14px;
    padding: 8px 16px;
    border-radius: 10px;
  }

  /* Help section: single column on mobile */
  #importModal .import-help-grid {
    grid-template-columns: 1fr;
  }

  #importModal .import-help-card {
    padding: 10px;
  }
}

.import-manage {
  border-top: 1px solid var(--border2);
  padding-top: 12px;
}

.import-manage-list {
  margin-top: 10px;
  display: grid;
  gap: 8px;
}

.import-manage-row {
  display: flex;
  flex-direction: column;
  gap: 8px;
  border: 1px solid var(--border2);
  background: var(--card);
  border-radius: 12px;
  padding: 10px;
}

.item-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  min-width: 0;
}

.import-manage-meta {
  font-size: 15px;
  font-weight: 500;
  color: var(--text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  min-width: 0;
  flex: 1;
}

.import-manage-secondary {
  display: flex;
  gap: 6px;
  flex-shrink: 0;
  align-items: center;
}

.import-manage-secondary button {
  padding: 4px 10px;
  font-size: 13px;
  min-height: 30px;
  border-radius: 8px;
}

.item-primary-action {
  width: 100%;
}

.item-primary-action button[data-action="learn"] {
  width: 100%;
  padding: 6px 14px;
  font-size: 13px;
  min-height: 34px;
  border-radius: 8px;
}

.import-help {
  border-top: 1px solid var(--border2);
  padding-top: 12px;
}

.import-help-title {
  font-weight: 900;
  font-size: 14px;
}

.import-help-text {
  margin-top: 4px;
  color: var(--muted);
  font-size: 13px;
}

.import-help-grid {
  margin-top: 10px;
  display: grid;
  gap: 10px;
  min-width: 0;
}

.import-help-card {
  border: 1px solid var(--border2);
  background: var(--card2);
  border-radius: 12px;
  padding: 10px;
  min-width: 0;
}

.import-help-card-title {
  font-weight: 800;
  font-size: 13px;
}

.import-help-card-sub {
  margin-top: 3px;
  color: var(--muted);
  font-size: 12px;
}

.import-help-code {
  margin: 8px 0 0;
  padding: 10px;
  border-radius: 10px;
  background: var(--accent);
  color: var(--accentText);
  font-size: 12px;
  line-height: 1.35;
  overflow: auto;
  white-space: pre;
  max-width: 100%;
  box-sizing: border-box;
}

.paper-wrap {
  padding-top: 14px;
  display: flex;
  justify-content: center;
}

.page-nav {
  margin-top: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
}

.page-indicator {
  min-width: 70px;
  text-align: center;
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
}

.paper {
  width: min(92vw, 520px);
  height: calc(min(92vw, 520px) * 297 / 210);
  background: var(--card);
  border: 1px solid var(--paperBorder);
  border-radius: 14px;
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}

.paper-inner {
  position: absolute;
  inset: 16px;
}

.paper-hint {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  color: var(--muted);
  font-size: 14px;
  text-align: center;
  pointer-events: none;
  padding: 0 12px;
}

.word-item {
  position: absolute;
  padding: 4px 6px;
  border-radius: 8px;
  background: var(--wordBg);
  border: 1px solid var(--wordBorder);
  user-select: none;
  max-width: 70%;
  white-space: normal;
}

.word-term {
  display: block;
  font-weight: 600;
  letter-spacing: 0.2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  cursor: pointer;
}

.word-meaning {
  display: none;
  margin-top: 2px;
  color: var(--muted);
  font-weight: 500;
  font-size: 0.78em;
  line-height: 1.15;
  max-width: 18em;
  overflow: hidden;
  text-overflow: ellipsis;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}

.show-meaning .word-meaning {
  display: -webkit-box;
}

.word-item.reveal .word-meaning {
  display: -webkit-box;
}

.show-meaning .word-item.hide-meaning .word-meaning {
  display: none;
}

.modal.hidden {
  display: none;
}

.modal {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: grid;
  place-items: center;
  padding: 18px;
  padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: var(--backdrop);
}

.modal-panel {
  position: relative;
  width: min(92vw, 560px);
  max-width: calc(100vw - 36px);
  max-height: min(80vh, 680px);
  background: var(--card);
  border-radius: 14px;
  border: 1px solid var(--border);
  box-shadow: var(--shadowModal);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  padding: 12px 12px 10px;
  border-bottom: 1px solid var(--border2);
}

.modal-header h2 {
  margin: 0;
  font-size: 16px;
}

.modal-actions {
  display: flex;
  gap: 8px;
}

.modal-body {
  padding: 12px;
  overflow: auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-width: 0;
}

.announcement-modal-panel {
  width: min(760px, 92vw);
}

.announcement-list {
  display: grid;
  gap: 12px;
}

.announcement-item {
  border: 1px solid color-mix(in srgb, var(--border2) 88%, transparent);
  background: var(--card2);
  border-radius: 16px;
  padding: 14px 16px;
  display: grid;
  gap: 10px;
}

.announcement-item.is-unread {
  border-color: color-mix(in srgb, var(--accent) 44%, var(--border2));
  box-shadow: 0 10px 24px color-mix(in srgb, var(--accent) 10%, transparent);
}

.announcement-item-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}

.announcement-item-title {
  font-size: 1.05rem;
  font-weight: 700;
}

.announcement-item-meta {
  font-size: 0.82rem;
  color: var(--muted);
  margin-top: 4px;
}

.announcement-item-badge {
  padding: 5px 10px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--accent) 16%, transparent);
  color: var(--accent-strong);
  font-size: 0.75rem;
  font-weight: 700;
  white-space: nowrap;
}

.announcement-item-content {
  line-height: 1.75;
  white-space: normal;
  word-break: break-word;
}

.review-meta {
  color: var(--muted);
  font-size: 13px;
}

.review-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.review-card {
  border: 1px solid var(--border);
  background: var(--card2);
  border-radius: 14px;
  padding: 14px;
  display: grid;
  gap: 10px;
  text-align: center;
  user-select: none;
  -webkit-user-select: none;
  touch-action: pan-y;
  position: relative;
  -webkit-user-drag: none;
  --swipe-x: 0px;
  --swipe-rot: 0deg;
  --swipe-opacity: 1;
  --swipe-right-alpha: 0;
  --swipe-left-alpha: 0;
  transform: translate3d(var(--swipe-x), 0, 0) rotate(var(--swipe-rot));
  opacity: var(--swipe-opacity);
  transition:
    transform 220ms cubic-bezier(0.2, 0.9, 0.25, 1),
    opacity 220ms cubic-bezier(0.2, 0.9, 0.25, 1);
}

.review-card,
.review-card * {
  -webkit-user-drag: none;
}

.review-card.is-dragging {
  transition: none;
  cursor: grabbing;
}

.review-card.review-card-swipe-enabled {
  cursor: grab;
}

.review-swipe-badges {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  padding: 0.9rem 1rem;
  pointer-events: none;
  z-index: 3;
}

.review-swipe-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem 0.7rem;
  border-radius: 999px;
  font-weight: 900;
  letter-spacing: 0.2px;
  transform: scale(0.96);
  opacity: 0;
  transition: opacity 80ms linear;
  backdrop-filter: blur(6px);
}

.review-swipe-badge-right {
  background: var(--accent);
  color: var(--accentText);
  opacity: var(--swipe-right-alpha);
}

.review-swipe-badge-left {
  background: #ff3b30;
  color: #ffffff;
  opacity: var(--swipe-left-alpha);
}

.review-card-progress {
  font-size: 12px;
  color: var(--muted);
}

.review-card-term {
  font-size: 28px;
  font-weight: 900;
  letter-spacing: 0.2px;
  line-height: 1.15;
  display: inline-block;
  padding: 4px 6px;
  border-radius: 10px;
  cursor: pointer;
}

.review-card-meaning {
  font-size: 14px;
  color: var(--muted);
  line-height: 1.35;
}

.review-card-faces {
  display: grid;
  gap: 8px;
}

.review-card.review-card-flip-enabled {
  perspective: 900px;
  --card-font-main: clamp(1.85rem, 4.8vw, 2.35rem);
  --card-font-secondary: clamp(1.55rem, 4.1vw, 2.15rem);
  --card-back-scale: 1;
}

.review-card.review-card-flip-enabled .review-card-faces {
  position: relative;
  min-height: clamp(10.5rem, 26vh, 13.5rem);
  display: block;
  transform-style: preserve-3d;
  will-change: transform;
  transition: transform 300ms cubic-bezier(0.22, 1, 0.36, 1);
}

.review-card.review-card-flip-enabled.is-flipped .review-card-faces {
  transform: rotateY(180deg);
}

.review-card.review-card-flip-enabled .review-card-face {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 0.65rem;
  padding: 0.9rem 0.95rem 2.3rem;
  backface-visibility: hidden;
  transform-style: preserve-3d;
  pointer-events: none;
}

.review-card.review-card-flip-enabled .review-card-back {
  transform: rotateY(180deg);
}

.review-card.review-card-flip-enabled:not(.is-flipped) .review-card-front {
  pointer-events: auto;
}

.review-card.review-card-flip-enabled.is-flipped .review-card-back {
  pointer-events: auto;
}

.review-card.review-card-flip-enabled .review-card-term {
  font-size: var(--card-font-main);
  max-width: min(34ch, 100%);
  overflow-wrap: anywhere;
  cursor: pointer;
  padding: 0.2rem 0.3rem;
  border-radius: 10px;
}

.review-card.review-card-flip-enabled:not(.is-dragging) .review-card-term:active {
  transform: scale(0.98);
}

@media (hover: hover) {
  .review-card.review-card-flip-enabled .review-card-term:hover {
    background: var(--surfaceHover);
  }
}

.review-card.review-card-flip-enabled .review-card-meaning {
  font-size: calc(var(--card-font-secondary) * var(--card-back-scale));
  font-weight: 800;
  color: var(--text);
  line-height: 1.45;
  max-width: min(40ch, 100%);
  overflow-wrap: anywhere;
  text-wrap: pretty;
  transition: font-size 160ms ease;
}

.review-card.review-card-flip-enabled .review-card-face::after {
  position: absolute;
  left: 0.85rem;
  right: 0.85rem;
  bottom: 0.75rem;
  font-size: 0.78rem;
  color: var(--muted);
  opacity: 0.85;
  letter-spacing: 0.1px;
  content: "";
}

.review-card.review-card-flip-enabled .review-card-front::after {
  content: "点空白翻面 / Click blank to flip";
}

.review-card.review-card-flip-enabled .review-card-back::after {
  content: "点任意处翻回 / Click to flip back";
}

@media (prefers-reduced-motion: reduce) {
  .review-card.review-card-flip-enabled .review-card-faces {
    transition: none;
  }
}

.review-card-hint {
  font-size: 12px;
  color: var(--muted);
}

.review-card-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.review-btn {
  padding: 12px 12px;
  border-radius: 14px;
  font-weight: 800;
  font-size: 14px;
}

.review-btn-known {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accentText);
}

.review-btn-learning {
  background: transparent;
}

.review-btn-known:hover {
  background: var(--accentHover);
}

.review-btn-unknown {
  background: transparent;
}

@media (min-width: 420px) {
  .review-card-actions {
    grid-template-columns: 1fr 1fr 1fr;
  }
}

@media (max-width: 679px) {
  .review-card-actions {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
  }

  .review-card-actions .review-btn {
    flex: 0 0 calc(50% - 5px);
  }

  .review-card-actions .review-btn-unknown {
    order: 3;
  }
}

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

.intro-block {
  border: 1px solid var(--border2);
  background: var(--card2);
  border-radius: 12px;
  padding: 12px;
}

.intro-title {
  font-weight: 900;
  font-size: 14px;
}

.intro-list {
  margin: 8px 0 0;
  padding-left: 18px;
  color: var(--text);
  font-size: 13px;
  line-height: 1.5;
}

.intro-list li {
  margin: 4px 0;
}

.intro-foot {
  color: var(--muted);
  font-size: 13px;
}

.review-item {
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--card2);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.review-item-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.review-item .t {
  font-weight: 700;
  cursor: pointer;
}

.review-item .m {
  color: var(--muted);
  font-size: 13px;
}

.review-item-actions {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.review-item-actions button {
  padding: 6px 8px;
  border-radius: 10px;
  font-size: 12px;
}

.review-item-actions button.active {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accentText);
}

@media (min-width: 920px) {
  .paper {
    width: min(60vw, 620px);
    height: calc(min(60vw, 620px) * 297 / 210);
  }

  .review-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .review-card-term {
    font-size: 34px;
  }
}

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

.panel {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 12px;
  display: grid;
  gap: 10px;
}

.form-row {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 10px;
  align-items: center;
}

.form-label {
  font-size: 13px;
  color: var(--muted);
}

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

.form-control-stack {
  flex-direction: column;
  align-items: stretch;
  gap: 6px;
}

.text-input {
  width: 100%;
  border: 1px solid var(--border3);
  background: var(--card);
  color: var(--text);
  padding: 10px 12px;
  border-radius: 10px;
  font-size: 14px;
  line-height: 1;
  font: inherit;
}

.text-input:focus {
  outline: none;
  border-color: var(--accent);
}

.text-input.is-invalid {
  border-color: rgba(180, 35, 24, 0.5);
  background: rgba(180, 35, 24, 0.04);
}

.text-input.is-invalid:focus {
  border-color: #b42318;
}

.form-help {
  font-size: 12px;
  color: var(--muted);
  line-height: 1.35;
}

.field-help {
  color: #b42318;
}

.account-tabs {
  margin-top: 4px;
}

.account-panel {
  scroll-margin-top: 12px;
}

.account-section {
  margin-top: 12px;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--card2);
  display: grid;
  gap: 10px;
}

.account-section-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--text);
}

.account-actions {
  display: grid;
  gap: 8px;
}

.account-summary {
  margin-top: 12px;
  padding: 12px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: linear-gradient(180deg, var(--card2), var(--card));
  display: grid;
  gap: 10px;
}

.account-summary-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}

.account-summary-identity {
  min-width: 0;
  display: grid;
  gap: 2px;
}

.account-summary-title {
  font-size: 16px;
  font-weight: 800;
  color: var(--text);
}

.account-summary-subtitle {
  margin-top: 3px;
  font-size: 12px;
  color: var(--muted);
  line-height: 1.4;
}

.account-badge {
  padding: 5px 9px;
  border-radius: 999px;
  background: rgba(15, 107, 68, 0.12);
  color: #0f6b44;
  font-size: 12px;
  font-weight: 700;
  white-space: nowrap;
}

.account-summary-meta-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.account-summary-meta-row-tight {
  gap: 6px;
}

.account-summary-meta-item {
  padding: 8px 10px;
  border-radius: 12px;
  background: var(--card2);
  border: 1px solid var(--border2);
  display: grid;
  gap: 2px;
}

.account-summary-meta-item span {
  font-size: 11px;
  color: var(--muted);
}

.account-summary-meta-item strong {
  font-size: 13px;
  color: var(--text);
  line-height: 1.35;
  word-break: break-word;
}

.account-summary-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.account-summary-grid.compact {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
}

.account-summary-grid.account-summary-grid-dense {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
}

.account-summary-item {
  padding: 9px 10px;
  border-radius: 12px;
  background: var(--card2);
  border: 1px solid var(--border2);
  display: grid;
  gap: 3px;
}

.account-summary-item span {
  font-size: 12px;
  color: var(--muted);
}

.account-summary-item strong {
  font-size: 14px;
  color: var(--text);
  word-break: break-word;
}

.account-summary-item-wide {
  grid-column: span 2;
}

.account-summary-quicklist {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

.account-summary-quickitem {
  padding: 8px 10px;
  border-radius: 12px;
  border: 1px dashed var(--border3);
  background: color-mix(in srgb, var(--card2) 88%, transparent);
  display: grid;
  gap: 3px;
}

.account-summary-quickitem span {
  font-size: 11px;
  color: var(--muted);
}

.account-summary-quickitem strong {
  font-size: 13px;
  color: var(--text);
  line-height: 1.35;
  word-break: break-word;
}

.account-summary-actions {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

.account-summary-actions > * {
  min-width: 0;
}

.account-sync-note {
  margin-top: 0;
}

.account-status {
  margin-top: 8px;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--border2);
  background: var(--card2);
}

.account-status.is-info {
  color: var(--text);
  border-color: var(--border3);
}

.account-status.is-success {
  color: #0f6b44;
  border-color: rgba(15, 107, 68, 0.22);
  background: rgba(15, 107, 68, 0.08);
}

.account-status.is-error {
  color: #b42318;
  border-color: rgba(180, 35, 24, 0.22);
  background: rgba(180, 35, 24, 0.08);
}

body.theme-dark .account-status.is-success {
  color: #7ee2b8;
  border-color: rgba(126, 226, 184, 0.24);
  background: rgba(126, 226, 184, 0.08);
}

body.theme-dark .account-status.is-error {
  color: #ff9b8f;
  border-color: rgba(255, 155, 143, 0.24);
  background: rgba(255, 155, 143, 0.08);
}

body.theme-dark .text-input.is-invalid {
  border-color: rgba(255, 155, 143, 0.55);
  background: rgba(255, 155, 143, 0.08);
}

body.theme-dark .text-input.is-invalid:focus {
  border-color: #ff9b8f;
}

body.theme-dark .field-help {
  color: #ff9b8f;
}

body.theme-dark .account-badge {
  background: rgba(126, 226, 184, 0.16);
  color: #7ee2b8;
}

.records-stats {
  font-size: 13px;
  color: var(--muted);
  padding: 0 4px;
  white-space: pre-line;
}

@media (min-width: 431px) and (max-width: 900px) {
  .account-panel .form-row {
    grid-template-columns: 92px minmax(0, 1fr);
    gap: 8px;
    align-items: start;
  }

  .account-tabs {
    gap: 6px;
  }

  .account-tabs button {
    flex: 1 1 0;
  }

  .account-summary-grid.account-summary-grid-dense {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .account-summary-actions {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 430px) {
  .account-panel .form-row {
    grid-template-columns: 1fr;
    gap: 6px;
    align-items: start;
  }

  .account-panel .form-label {
    font-size: 12px;
  }

  .account-tabs {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 6px;
  }

  .account-tabs button {
    width: 100%;
    min-width: 0;
    padding: 8px 4px;
    font-size: 13px;
  }

  .account-section {
    margin-top: 10px;
    padding: 10px;
    gap: 8px;
  }

  .account-actions {
    gap: 6px;
  }

  .account-summary {
    margin-top: 10px;
    padding: 10px;
    gap: 8px;
  }

  .account-summary-head {
    gap: 8px;
  }

  .account-summary-title {
    font-size: 15px;
  }

  .account-summary-subtitle {
    font-size: 11px;
    line-height: 1.35;
    word-break: break-word;
  }

  .account-badge {
    padding: 4px 8px;
    font-size: 11px;
  }

  .account-summary-meta-row,
  .account-summary-grid.account-summary-grid-dense {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 6px;
  }

  .account-summary-meta-item,
  .account-summary-item {
    padding: 8px;
  }

  .account-summary-meta-item strong,
  .account-summary-item strong {
    font-size: 13px;
  }

  .account-summary-actions {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 6px;
  }

  .account-summary-actions #cloudLogoutBtn {
    grid-column: 1 / -1;
  }

  .account-summary-actions button {
    width: 100%;
  }

  .account-sync-note {
    font-size: 11px;
    line-height: 1.4;
  }
}

.empty {
  border: 1px dashed var(--border3);
  background: var(--card);
  border-radius: 14px;
  padding: 18px;
  display: grid;
  gap: 10px;
  justify-items: start;
}

.empty-title {
  font-weight: 800;
}

.empty-sub {
  color: var(--muted);
  font-size: 13px;
}

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

.round-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  overflow: hidden;
}

.round-head {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  align-items: flex-start;
  padding: 12px;
  border-bottom: 1px solid var(--border2);
}

.round-head-main {
  min-width: 0;
  display: grid;
  gap: 4px;
}

.round-title-row {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.round-title {
  font-weight: 900;
}

.round-tag {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  border-radius: 999px;
  border: 1px solid var(--border2);
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
  white-space: nowrap;
}

.round-meta {
  margin-top: 4px;
  color: var(--muted);
  font-size: 13px;
}

.round-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.round-grid {
  display: grid;
  gap: 12px;
  grid-template-columns: 1fr;
  padding: 12px;
}

.section-title {
  font-weight: 800;
  font-size: 13px;
  color: var(--text);
  margin-bottom: 8px;
}

.paper.paper-mini {
  width: min(92vw, 320px);
  height: calc(min(92vw, 320px) * 297 / 210);
  border-radius: 12px;
  box-shadow: none;
}

.words-list {
  display: grid;
  gap: 8px;
}

.toast {
  margin-top: 10px;
  padding: 10px 12px;
  border: 1px solid var(--border2);
  border-radius: 12px;
  background: var(--card2);
  color: var(--text);
  font-size: 13px;
  line-height: 1.3;
}

.word-row {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 10px;
  border: 1px solid var(--border2);
  border-radius: 12px;
  padding: 10px;
  background: var(--card2);
}

#statusView .word-row {
  grid-template-columns: 1fr;
  gap: 6px;
}

#statusView .word-row .w {
  display: flex;
  align-items: baseline;
  gap: 8px;
  flex-wrap: wrap;
}

#statusView .word-row .m {
  color: var(--text);
}

#statusView .words-list {
  grid-template-columns: 1fr;
}

@media (min-width: 760px) {
  #statusView .words-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.word-row .w {
  font-weight: 800;
}

.word-row .m {
  color: var(--muted);
  font-size: 13px;
}

.view-tabs {
  display: inline-flex;
  gap: 8px;
  align-items: center;
  flex: 0 0 auto;
}

.view-tabs button {
  padding: 8px 10px;
  border-radius: 999px;
  white-space: nowrap;
}

.view-tabs button.active {
  background: var(--accent);
  color: var(--accentText);
  border-color: var(--accent);
}

.word-row .meta {
  margin-top: 6px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.3;
  white-space: normal;
}

.lookup-row .lookup-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
}

.lookup-row .lookup-title {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  flex-wrap: wrap;
  min-width: 0;
}

.lookup-row .lookup-add-btn {
  padding: 8px 10px;
  border-radius: 10px;
  font-size: 13px;
  line-height: 1;
  white-space: nowrap;
}

.lookup-meaning-primary {
  color: var(--text);
}

.lookup-meaning-secondary {
  margin-top: 4px;
  font-size: 12px;
  color: var(--muted);
  white-space: normal;
}

@media (max-width: 520px) {
  .lookup-row .lookup-head {
    flex-direction: column;
    align-items: stretch;
  }

  .lookup-row .lookup-add-btn {
    width: 100%;
  }
}

.word-status {
  display: inline-block;
  margin-left: 8px;
  padding: 2px 8px;
  border-radius: 999px;
  border: 1px solid var(--border2);
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
  vertical-align: middle;
}

.word-status-mastered {
  border-color: var(--accent);
  color: var(--accent);
}

.word-status-learning {
  border-color: var(--border2);
  color: var(--text);
}

.word-status-unknown {
  border-color: var(--border2);
  color: var(--muted);
}

.words-empty {
  color: var(--muted);
  font-size: 13px;
}

.immersive .subtitle {
  display: none;
}

.immersive .immersive-hide {
  display: none !important;
}

.immersive .controls {
  position: sticky;
  top: calc(8px + env(safe-area-inset-top));
  z-index: 20;
}

.immersive .paper {
  width: min(96vw, 760px);
  height: calc(min(96vw, 760px) * 297 / 210);
}

@media (max-width: 560px) {
  .app-header {
    flex-wrap: wrap;
    align-items: flex-start;
  }

  .title {
    min-width: 0;
    flex: 1 1 100%;
  }

  .status {
    min-width: 0;
    align-items: flex-start;
    width: 100%;
  }

  .status-meta {
    text-align: left;
  }

  .status-progress {
    width: 100%;
    max-width: 220px;
  }

  .select-wrap {
    flex: 1 1 100%;
    min-width: 0;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  #statusView .word-row {
    grid-template-columns: 1fr;
  }

  .records-page .round-actions button {
    padding: 8px 10px;
    font-size: 13px;
    flex: 1 1 calc(50% - 8px);
  }
}

@media (max-width: 920px) {
  .records-page .round-actions button {
    padding: 8px 10px;
    font-size: 13px;
  }
}

@media (min-width: 920px) {
  .round-head {
    grid-template-columns: 1fr auto;
    align-items: center;
  }

  .round-grid {
    grid-template-columns: 360px 1fr;
  }

  .round-grid.round-grid-single {
    grid-template-columns: 1fr;
  }

  .paper.paper-mini {
    width: 320px;
    height: calc(320px * 297 / 210);
  }
}

/* ≤ 430px: reduce word label size to fight overlap */
@media (max-width: 430px) {
  .word-term {
    font-size: 12px;
    line-height: 1.2;
  }

  .word-item {
    padding: 2px 4px;
    box-sizing: border-box;
  }
}

/* ≤ 390px: further reduce for very small screens */
@media (max-width: 390px) {
  .word-term {
    font-size: 11px;
  }

  .word-item {
    padding: 2px 3px;
  }
}

@media print {
  body {
    background: #ffffff;
    color: #0b1220;
    --bg: #ffffff;
    --text: #0b1220;
    --muted: #5b6477;
    --card: #ffffff;
    --card2: #fbfcff;
    --border: #e7eaf2;
    --border2: #eef1f7;
    --border3: #d8deeb;
    --accent: #0b1220;
    --accentHover: #111a33;
    --accentText: #ffffff;
    --surfaceHover: #f6f7fb;
    --paperBorder: #e1e5f0;
    --shadow: none;
    --shadowModal: none;
    --wordBg: rgba(11, 18, 32, 0.04);
    --wordBorder: rgba(11, 18, 32, 0.08);
    --backdrop: rgba(11, 18, 32, 0.45);
  }

  .no-print {
    display: none !important;
  }

  .round-card {
    break-inside: avoid;
    page-break-inside: avoid;
  }

  .round-card:not(:last-child) {
    break-after: page;
    page-break-after: always;
  }
}