/* B2 词汇清单页 */
.b2-body {
  background: var(--bg);
}
.b2-head {
  padding: 32px 0 26px;
  color: #fff;
  background:
    radial-gradient(900px 360px at 10% -20%, rgba(47, 107, 255, .42), transparent 60%),
    radial-gradient(700px 300px at 92% 0%, rgba(20, 184, 166, .24), transparent 62%),
    linear-gradient(135deg, #171c28 0%, #232c42 58%, #2c3a5c 100%);
}
.b2-back {
  color: #c3cde0;
  font-size: 12.5px;
}
.b2-back:hover { color: #fff; text-decoration: none; }
.b2-head h1 {
  margin: 10px 0 4px;
  font-size: clamp(24px, 4vw, 34px);
  letter-spacing: .5px;
}
.b2-sub {
  margin: 0 0 16px;
  color: #c3cde0;
  font-size: 13px;
}
.b2-progress { max-width: 640px; }
.b2-bar {
  height: 8px;
  background: rgba(255, 255, 255, .18);
  border-radius: 999px;
  overflow: hidden;
}
.b2-bar i {
  display: block;
  height: 100%;
  width: 0;
  border-radius: 999px;
  background: linear-gradient(90deg, #5b8cff, #2ee6c8);
  transition: width .25s ease;
}
.b2-progress-meta {
  display: flex;
  justify-content: space-between;
  margin-top: 6px;
  font-size: 12px;
  color: #c3cde0;
}

.b2-main { padding: 18px 0 44px; }

.b2-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}
.b2-scopes { display: flex; gap: 8px; }
.b2-scope {
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--ink-2);
  padding: 7px 14px;
  border-radius: 999px;
  font-size: 13px;
  cursor: pointer;
}
.b2-scope span { color: var(--ink-3); font-size: 11px; margin-left: 4px; }
.b2-scope.active { background: var(--ink); border-color: var(--ink); color: #fff; }
.b2-scope.active span { color: rgba(255, 255, 255, .7); }

.b2-tools { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
#b2-search {
  width: 240px;
  max-width: 100%;
  padding: 8px 12px;
  font-size: 13px;
  color: var(--ink);
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 9px;
  outline: none;
}
#b2-search:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
#b2-search::-webkit-search-cancel-button { -webkit-appearance: none; appearance: none; display: none; }
.b2-filters { display: flex; gap: 6px; }
.b2-filter {
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--ink-2);
  padding: 6px 11px;
  border-radius: 999px;
  font-size: 12px;
  cursor: pointer;
}
.b2-filter.active { border-color: var(--accent); color: var(--accent); background: var(--accent-soft); }

.b2-layout {
  display: grid;
  grid-template-columns: 1fr 290px;
  gap: 16px;
  align-items: start;
}
.b2-panel {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 12px 16px 14px;
  box-shadow: 0 1px 2px rgba(31, 36, 48, .03);
}
.b2-list-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 2px 4px 10px;
  border-bottom: 1px solid var(--line);
  font-size: 12px;
  color: var(--ink-2);
}
.b2-bulk { display: flex; align-items: center; gap: 6px; cursor: pointer; font-size: 12px; }
.b2-bulk input { accent-color: var(--accent); }

.b2-list { list-style: none; margin: 0; padding: 0; }
.b2-row {
  display: grid;
  grid-template-columns: 24px 190px 150px 1fr 46px 24px 28px;
  grid-template-areas: "cb word phon mean lv say star";
  align-items: center;
  gap: 10px;
  padding: 9px 4px;
  border-bottom: 1px dashed var(--line-2);
  font-size: 12.5px;
}
.b2-row:hover { background: #f8fafd; }
.b2-say {
  grid-area: say;
  border: 0;
  background: none;
  padding: 2px;
  font-size: 13px;
  line-height: 1;
  cursor: pointer;
  opacity: .5;
}
.b2-say:hover { opacity: 1; }
.b2-custom-phon { color: var(--ink-3); font-size: 11px; }
.b2-cb { grid-area: cb; accent-color: var(--accent); margin: 0; width: 16px; height: 16px; cursor: pointer; }
.b2-word { grid-area: word; min-width: 0; }
.b2-word b { display: block; font-size: 14.5px; color: var(--ink); font-weight: 600; word-break: break-word; }
.b2-word span { display: block; font-size: 10.5px; color: var(--ink-3); }
.b2-phon { grid-area: phon; color: var(--ink-3); font-size: 11.5px; word-break: break-word; }
.b2-mean { grid-area: mean; color: var(--ink-2); line-height: 1.55; }
.b2-level {
  grid-area: lv;
  justify-self: end;
  font-size: 10.5px;
  font-weight: 700;
  padding: 1px 7px;
  border-radius: 999px;
  background: #eef2f8;
  color: var(--ink-3);
}
.lv-A1, .lv-A2 { background: #e8f7ee; color: #15803d; }
.lv-B1, .lv-B2 { background: #e8f0ff; color: #1d4ed8; }
.lv-C1, .lv-C2 { background: #f1eaff; color: #6d28d9; }
.b2-star {
  grid-area: star;
  justify-self: end;
  border: 0;
  background: none;
  padding: 0;
  font-size: 17px;
  line-height: 1;
  color: var(--ink-3);
  cursor: pointer;
}
.b2-star:hover { color: #f59e0b; }
.b2-star.on { color: #f59e0b; }
.b2-star-count { margin: -2px 0 10px; font-size: 12px; font-weight: 600; color: #b45309; }
.b2-row.known { background: #f8fafd; }
.b2-row.known .b2-word b { text-decoration: line-through; color: var(--ink-3); }
.b2-row.known .b2-mean,
.b2-row.known .b2-phon { opacity: .55; }

.b2-empty, .b2-error {
  padding: 28px 10px;
  text-align: center;
  color: var(--ink-3);
  font-size: 13px;
  list-style: none;
}
.b2-more-wrap { text-align: center; padding-top: 12px; }
.b2-more {
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--ink-2);
  padding: 7px 18px;
  border-radius: 999px;
  font-size: 12.5px;
  cursor: pointer;
}
.b2-more:hover { border-color: var(--accent); color: var(--accent); }

.b2-side-close {
  display: none;
  position: absolute;
  top: 10px;
  right: 12px;
  width: 32px;
  height: 32px;
  border: 0;
  border-radius: 50%;
  background: var(--line-2);
  color: var(--ink-2);
  font-size: 13px;
  cursor: pointer;
  place-items: center;
}
.b2-side-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(23, 28, 40, .45);
  z-index: 80;
}
.b2-side-overlay[hidden] { display: none; }

.b2-side {
  position: sticky;
  top: 16px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: 0 1px 2px rgba(31, 36, 48, .03);
}
.b2-side h2 { margin: 0 0 6px; font-size: 15px; }
.b2-nb-count { margin: 0 0 6px; font-size: 13px; font-weight: 700; color: var(--ink); }
.b2-nb-hint { margin: 0 0 12px; font-size: 11.5px; color: var(--ink-3); line-height: 1.6; }
.b2-btn {
  display: block;
  width: 100%;
  margin-bottom: 8px;
  padding: 9px 10px;
  border: 1px solid var(--ink);
  background: var(--ink);
  color: #fff;
  border-radius: 9px;
  font-size: 12.5px;
  cursor: pointer;
}
.b2-btn:hover { opacity: .9; }
.b2-btn.ghost {
  background: transparent;
  color: var(--ink-2);
  border-color: var(--line);
}
.b2-btn.ghost:hover { border-color: var(--warn); color: var(--warn); }
.b2-note { margin: 8px 0 0; font-size: 10.8px; color: var(--ink-3); line-height: 1.6; }

.b2-nb-bar {
  display: none;
  align-items: center;
  gap: 14px;
  margin-bottom: 10px;
  padding: 8px 12px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  font-size: 12px;
  color: var(--ink-2);
}
.b2-nb-open {
  border: 0;
  background: none;
  padding: 2px 0;
  font: inherit;
  color: var(--ink-2);
  cursor: pointer;
}
.b2-nb-open b { color: var(--ink); margin-left: 3px; }
.b2-nb-open:hover { color: var(--accent); }
.b2-nb-bar-hint { margin-left: auto; color: var(--ink-3); font-size: 11px; }

.b2-source {
  margin: 22px 0 0;
  font-size: 11px;
  color: var(--ink-3);
  line-height: 1.7;
}

@media (max-width: 900px) {
  .b2-layout { grid-template-columns: 1fr; }
  .b2-nb-bar { display: flex; }

  /* 生词本 / 工具：底部抽屉 */
  .b2-side {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    top: auto;
    z-index: 81;
    max-height: 82vh;
    max-height: 82dvh;
    overscroll-behavior: contain;
    margin: 0;
    padding: 20px 16px calc(20px + env(safe-area-inset-bottom));
    overflow-y: auto;
    border-radius: 16px 16px 0 0;
    box-shadow: 0 -12px 40px rgba(23, 28, 40, .22);
    transform: translateY(105%);
    transition: transform .24s ease;
    -webkit-overflow-scrolling: touch;
  }
  body.b2-side-open .b2-side { transform: none; }
  body.b2-side-open { overflow: hidden; }
  .b2-side-overlay { display: block; }
  .b2-side-close { display: grid; }
}
@media (max-width: 640px) {
  .b2-head { padding: 24px 0 20px; }
  .b2-row {
    grid-template-columns: 24px 1fr auto auto auto;
    grid-template-areas:
      "cb word lv say star"
      ". phon phon phon phon"
      ". mean mean mean mean";
    gap: 3px 8px;
    padding: 10px 4px;
  }
  .b2-phon { font-size: 11px; }
  .b2-say { font-size: 17px; padding: 6px; opacity: .6; }
  .b2-mean { font-size: 12px; }
  #b2-search { width: 100%; }
  .b2-acc-toggle { max-width: 150px; }

  /* iOS 输入框低于 16px 会触发页面缩放 */
  #b2-search,
  #b2-acc-user,
  #b2-acc-pass,
  #b2-acc-rcode,
  #b2-acc-rpass,
  #b2-sync-input,
  #b2-custom-w,
  #b2-custom-t,
  #b2-custom-p { font-size: 16px; }

  .b2-cb { width: 20px; height: 20px; }
  .b2-star { font-size: 22px; padding: 6px; margin: -6px -4px -6px 0; }
  .b2-row { padding: 12px 2px; }
  .b2-filter { padding: 8px 12px; }
  .b2-scope { padding: 9px 14px; }
  .b2-nb-bar-hint { display: none; }
  .b2-main { padding-bottom: calc(50px + env(safe-area-inset-bottom)); }
  .b2-filter,
  .b2-scope,
  .b2-star,
  .b2-cb,
  .b2-row,
  .b2-btn,
  .b2-nb-open { touch-action: manipulation; }
  .b2-tools { width: 100%; }
  .b2-filters { flex-wrap: wrap; }
}

/* ---------- 多设备同步 ---------- */
.b2-sync {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}
.b2-sync h3 { margin: 0 0 4px; font-size: 13.5px; }
.b2-sync-hint { margin: 0 0 8px; font-size: 10.8px; color: var(--ink-3); line-height: 1.6; }
#b2-sync-input {
  width: 100%;
  padding: 8px 10px;
  margin-bottom: 8px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-size: 12.5px;
  color: var(--ink);
  background: var(--card);
  outline: none;
}
#b2-sync-input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.b2-sync-btns { display: flex; gap: 6px; }
.b2-sync-btns .b2-btn { margin-bottom: 0; }
.b2-sync-code { font-size: 13px; margin-bottom: 4px; color: var(--ink-2); }
.b2-sync-code b { letter-spacing: 1.5px; color: var(--accent); font-size: 15px; }
.b2-sync-status { font-size: 11px; color: var(--ink-3); margin-bottom: 8px; min-height: 16px; }

/* ---------- 账号 ---------- */
.b2-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.b2-account { position: relative; flex: none; }
.b2-acc-toggle {
  max-width: 200px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  background: rgba(255, 255, 255, .12);
  border: 1px solid rgba(255, 255, 255, .25);
  color: #fff;
  padding: 6px 13px;
  border-radius: 999px;
  font-size: 12.5px;
  cursor: pointer;
}
.b2-acc-toggle:hover { background: rgba(255, 255, 255, .2); }
.b2-acc-panel {
  position: absolute;
  right: 0;
  top: calc(100% + 8px);
  width: min(300px, calc(100vw - 28px));
  background: var(--card);
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px;
  box-shadow: 0 14px 40px rgba(23, 28, 40, .22);
  z-index: 60;
}
.b2-acc-title {
  margin: 0 0 8px;
  font-size: 13px;
  font-weight: 700;
  color: var(--ink);
}
#b2-acc-user,
#b2-acc-pass,
#b2-acc-rcode,
#b2-acc-rpass {
  width: 100%;
  padding: 8px 10px;
  margin-bottom: 6px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-size: 12.5px;
  color: var(--ink);
  background: var(--card);
  outline: none;
}
#b2-acc-user:focus,
#b2-acc-pass:focus,
#b2-acc-rcode:focus,
#b2-acc-rpass:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.b2-linkbtn {
  border: 0;
  background: none;
  color: var(--accent);
  font-size: 11.5px;
  cursor: pointer;
  padding: 0;
  margin: 4px 0;
}
.b2-linkbtn:hover { text-decoration: underline; }
.b2-acc-note { margin: 6px 0 0; font-size: 10.6px; color: var(--ink-3); line-height: 1.6; }
.b2-acc-who { margin: 0 0 8px; font-size: 12.5px; color: var(--ink-2); }
.b2-acc-status { min-height: 16px; margin: 6px 0 0; font-size: 11px; color: var(--ink-3); }
.b2-acc-recovery {
  margin-top: 6px;
  padding: 8px 10px;
  background: #fffdf5;
  border: 1px solid #f1e6c8;
  border-radius: 8px;
  font-size: 11px;
  color: #6b5a2e;
  line-height: 1.6;
}
.b2-acc-recovery b { letter-spacing: 1px; }

/* ---------- 自定义词条 ---------- */
.b2-custom {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}
.b2-custom h3 { margin: 0 0 4px; font-size: 13.5px; }
.b2-custom-hint { margin: 0 0 8px; font-size: 10.8px; color: var(--ink-3); line-height: 1.6; }
#b2-custom-w,
#b2-custom-t {
  width: 100%;
  padding: 7px 10px;
  margin-bottom: 6px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-size: 12.5px;
  color: var(--ink);
  background: var(--card);
  outline: none;
}
#b2-custom-w:focus,
#b2-custom-t:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.b2-custom-list { list-style: none; margin: 8px 0; padding: 0; }
.b2-custom-list li {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 8px;
  padding: 6px 0;
  border-bottom: 1px dashed var(--line-2);
  font-size: 12px;
}
.b2-custom-list li div { min-width: 0; }
.b2-custom-list b { display: block; color: var(--ink); font-weight: 600; word-break: break-word; }
.b2-custom-list span { color: var(--ink-3); font-size: 11px; }
.b2-custom-del {
  flex: none;
  border: 0;
  background: none;
  color: var(--ink-3);
  font-size: 12px;
  cursor: pointer;
  padding: 2px 4px;
}
.b2-custom-del:hover { color: var(--danger, #dc2626); }
.b2-custom-empty { color: var(--ink-3); font-size: 11.5px; border-bottom: 0 !important; }