/* ===========================================================================
 * 开心格 · 场景词库（KET 词汇等）
 * 复用全站 :root 品牌色与 .btn。难度三色：Easy 绿 / Medium 黄 / Super hard 红。
 * 遵循团队 preference：同一排按钮同高同字号、控件文字不换行、数字卡 k/v/s、
 * 计数为 0 的 chip 不渲染、手机端比电脑端更简。
 * =========================================================================== */
@font-face {
  font-family: "Alibaba PuHuiTi 3";
  src: url("https://cdn.jsdelivr.net/npm/alibabapuhuiti-3-105-heavy@1.0.0/AlibabaPuHuiTi-3-105-Heavy.woff2") format("woff2");
  font-weight: 900; font-style: normal; font-display: swap;
}
:root {
  --kv-title: "Funnel Sans", "Alibaba PuHuiTi 3", "HarmonyOS Sans SC", "PingFang SC", "Microsoft YaHei UI", "Microsoft YaHei", system-ui, sans-serif;
  --lv-easy: #2EB872;
  --lv-easy-soft: #E7F8EF;
  --lv-medium: #E0A800;
  --lv-medium-soft: #FFF6D6;
  --lv-hard: #F0524F;
  --lv-hard-soft: #FFE9E8;
  --kv-line: #e6eaf1;
  --kv-muted: #8a93a3;
  --kv-zhan: #7C5CFF;
  --kv-zhan-dark: #5B3FE0;
  --kv-zhan-soft: #F0ECFF;
}

.kv-main { width: 100%; max-width: 960px; margin: 0 auto; }
.kv-main .page-title,
.kv-stat .v, .kv-q-word, .kv-q-zh, .kv-reveal-word, .kv-done-title, .kv-done-nums b, .kv-tile-word {
  font-family: var(--kv-title);
  font-weight: 700;
}
.kv-loading, .kv-empty { color: var(--kv-muted); font-weight: 600; padding: 28px 0; text-align: center; }

/* 控件里的字永远不换行（preference：按钮 / 标签不许被挤成竖排） */
.kv-btn, .kv-chip, .kv-lv, .kv-st, .kv-tab, .kv-zhan, .kv-add, .kv-select, .kv-gen, .kv-verdict, .kv-q-new, .kv-pos, .kv-week-tag {
  white-space: nowrap; flex-shrink: 0;
}

/* ---------------------------------------------------------------- 通用控件 -- */
.kv-select, .kv-input {
  height: 36px; font-family: inherit; font-size: 0.88rem; font-weight: 600; color: var(--dark);
  background: var(--white); border: 1.5px solid var(--kv-line); border-radius: 10px; padding: 0 12px;
}
.kv-select {
  appearance: none; -webkit-appearance: none; padding-right: 32px; cursor: pointer;
  background: var(--white) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%238a93a3' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E") no-repeat right 10px center / 14px;
}
.kv-input:focus, .kv-select:focus { outline: none; border-color: var(--blue); }

/* 同一排按钮同高同字号，主次只靠颜色 */
.kv-btn { height: 40px; padding: 0 18px; font-size: 0.9rem; border-radius: 12px; gap: 6px; box-shadow: none; }
.kv-btn svg { width: 16px; height: 16px; }
.kv-btn:disabled { opacity: 0.45; cursor: not-allowed; transform: none; box-shadow: none; }
.kv-btn-line { background: var(--white); color: var(--dark); border: 1.5px solid var(--kv-line); }
.kv-btn-line:hover { border-color: var(--blue); color: var(--blue); }
.kv-btn-ghost { background: transparent; color: var(--kv-muted); border: 1.5px solid transparent; }
.kv-btn-ghost:hover { color: var(--dark); box-shadow: none; }

.kv-icon-btn {
  width: 36px; height: 36px; display: grid; place-items: center; flex-shrink: 0;
  border: 1.5px solid var(--kv-line); border-radius: 50%; background: var(--white); color: #5a6475; cursor: pointer;
}
.kv-icon-btn svg { width: 18px; height: 18px; }
.kv-icon-btn:hover { color: var(--blue); border-color: var(--blue); }

.kv-say {
  display: inline-grid; place-items: center; width: 30px; height: 30px; flex-shrink: 0;
  border: none; border-radius: 50%; background: #eef4ff; color: var(--blue); cursor: pointer; vertical-align: middle;
}
.kv-say svg { width: 17px; height: 17px; }
.kv-say:hover { background: var(--blue); color: var(--white); }

/* 难度小签：一个色点 + 名字 */
.kv-lv {
  display: inline-flex; align-items: center; gap: 5px; height: 24px; padding: 0 9px;
  font-size: 0.75rem; line-height: 24px; font-weight: 800; border-radius: 999px; border: none; font-family: inherit;
}
.kv-lv i, .kv-chip i, .kv-level-name i { width: 8px; height: 8px; border-radius: 50%; display: inline-block; background: currentColor; }
.kv-lv em { font-style: normal; font-size: 0.66rem; opacity: 0.7; margin-left: 2px; }
.lv-easy { --lv: var(--lv-easy); --lv-soft: var(--lv-easy-soft); }
.lv-medium { --lv: var(--lv-medium); --lv-soft: var(--lv-medium-soft); }
.lv-hard { --lv: var(--lv-hard); --lv-soft: var(--lv-hard-soft); }
.kv-lv.lv-easy, .kv-lv.lv-medium, .kv-lv.lv-hard { color: var(--lv); background: var(--lv-soft); }
.kv-lv-btn { cursor: pointer; }
.kv-lv-btn:hover { box-shadow: 0 0 0 1.5px var(--lv); }

/* 进度状态小签 */
.kv-st {
  display: inline-flex; align-items: center; gap: 4px; height: 24px; padding: 0 9px;
  font-size: 0.75rem; line-height: 24px; font-weight: 800; border-radius: 999px; border: none; font-family: inherit;
}
.kv-st.st-known { color: #fff; background: var(--lv-easy); }
.kv-st.st-pending { color: var(--kv-zhan-dark); background: var(--kv-zhan-soft); }
.kv-st.st-learning { color: #2f6fd6; background: #e8f0ff; }
.kv-st.st-new { color: var(--kv-muted); background: #f1f3f7; }
.kv-st-btn { cursor: pointer; }
.kv-st-btn:hover { box-shadow: 0 0 0 1.5px var(--blue); }
.kv-src { font-style: normal; font-size: 0.66rem; font-weight: 700; opacity: 0.85; }

/* 筛选 chip */
.kv-chips { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.kv-chip {
  display: inline-flex; align-items: center; gap: 6px; height: 32px; padding: 0 12px;
  font-family: inherit; font-size: 0.82rem; font-weight: 800; color: #5a6475; line-height: 32px;
  background: var(--white); border: 1.5px solid var(--kv-line); border-radius: 999px; cursor: pointer; transition: all 0.15s;
}
.kv-chip b { font-weight: 800; color: var(--kv-muted); }
.kv-chip.lv-easy i, .kv-chip.lv-medium i, .kv-chip.lv-hard i { background: var(--lv); }
.kv-chip.lv-easy.on, .kv-chip.lv-medium.on, .kv-chip.lv-hard.on { background: var(--lv); border-color: var(--lv); color: #fff; }
.kv-chip.on i { background: #fff !important; }
.kv-chip.on b { color: rgba(255, 255, 255, 0.85); }
.kv-chip[class*="st-"].on { background: var(--dark); border-color: var(--dark); color: #fff; }
.kv-chip-sep { width: 1px; height: 20px; background: var(--kv-line); margin: 0 2px; }

/* ------------------------------------------------------------------ 页签 -- */
.kv-tabs { display: flex; gap: 4px; padding: 4px; background: #eef1f6; border-radius: 14px; width: fit-content; margin-bottom: 18px; }
.kv-tab {
  height: 36px; padding: 0 18px; border: none; border-radius: 10px; background: transparent;
  font-family: inherit; font-size: 0.9rem; font-weight: 800; color: #6b7280; cursor: pointer;
}
.kv-tab.active { background: var(--white); color: var(--dark); box-shadow: var(--shadow-sm); }
.kv-tab { display: inline-flex; align-items: center; gap: 6px; }
.kv-tab-badge { min-width: 20px; height: 20px; line-height: 20px; padding: 0 6px; border-radius: 999px; font-size: 0.72rem; font-weight: 800; color: #fff; background: var(--kv-zhan); }
.kv-row.ro { grid-template-columns: 30px minmax(0, 1.6fr) minmax(0, 1fr) auto auto 24px 44px; }
.kv-row-head.ro { grid-template-columns: 1fr; }
.kv-star.on:not(button) { color: #FFB300; cursor: default; }

.kv-learner { display: inline-flex; align-items: center; gap: 8px; }
.kv-learner-label { font-size: 0.82rem; font-weight: 800; color: var(--kv-muted); white-space: nowrap; }

/* ============================================================== 首页 == */
.kv-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-bottom: 14px; }
/* 数字卡 k / v / s：说明行钉在卡底，几张卡的说明在同一条线上 */
.kv-stat {
  display: flex; flex-direction: column; gap: 2px; min-height: 112px;
  background: var(--white); border: 1.5px solid var(--kv-line); border-top: 4px solid var(--c, var(--blue));
  border-radius: 0 0 16px 16px; padding: 12px 16px;
  font-family: inherit; text-align: left; cursor: pointer; transition: transform 0.15s, box-shadow 0.15s;
}
.kv-stat:hover { transform: translateY(-2px); box-shadow: 0 10px 22px -14px var(--c, var(--blue)); }
.kv-stat .k { display: flex; align-items: center; justify-content: space-between; }
.kv-stat .k svg, .kv-level-num svg { width: 14px; height: 14px; color: #c3cad6; flex-shrink: 0; }
.kv-stat:hover .k svg { color: var(--c); }
.kv-stat .k { font-size: 0.8rem; font-weight: 800; color: var(--kv-muted); }
.kv-stat .v { font-size: 2rem; line-height: 1.15; color: var(--dark); }
.kv-stat .s { margin-top: auto; font-size: 0.78rem; font-weight: 600; color: var(--kv-muted); }
.st-known-card { --c: var(--lv-easy); }
.st-pending-card { --c: var(--kv-zhan); }
.st-learning-card { --c: var(--blue); }
.st-new-card { --c: #c3cad6; }

.kv-levels { display: flex; flex-direction: column; gap: 8px; margin-bottom: 18px; }
.kv-level-row {
  display: grid; grid-template-columns: 112px 1fr 92px; align-items: center; gap: 12px;
  padding: 10px 14px; background: var(--white); border: 1.5px solid var(--kv-line); border-radius: 14px;
  font-family: inherit; cursor: pointer; text-align: left; transition: border-color 0.15s;
}
.kv-level-row:hover { border-color: var(--lv); }
.kv-level-name { display: inline-flex; align-items: center; gap: 8px; font-size: 0.9rem; font-weight: 800; color: var(--lv); white-space: nowrap; }
.kv-level-name i { width: 10px; height: 10px; }
.kv-level-bar { display: flex; height: 10px; border-radius: 999px; background: #f0f2f6; overflow: hidden; }
.kv-level-bar .known { background: var(--lv); }
.kv-level-bar .pending { background: var(--kv-zhan); opacity: 0.7; }
.kv-level-bar .learning { background: var(--lv); opacity: 0.3; }
.kv-level-num { display: inline-flex; align-items: center; justify-content: flex-end; gap: 4px; font-size: 0.82rem; font-weight: 700; color: var(--kv-muted); text-align: right; white-space: nowrap; }
.kv-level-num b { color: var(--dark); }

.kv-start { display: flex; flex-direction: column; gap: 14px; padding: 16px; background: var(--white); border: 1.5px solid var(--kv-line); border-radius: 16px; }
.kv-start-filters { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; justify-content: space-between; }
.kv-start-btns { display: flex; flex-wrap: wrap; gap: 10px; }

/* ============================================================== 练习 == */
.kv-session { max-width: 620px; margin: 0 auto; }
.kv-sess-top { display: flex; align-items: center; gap: 12px; margin-bottom: 16px; }
.kv-track { flex: 1; height: 12px; border-radius: 999px; background: #e9edf3; overflow: hidden; }
.kv-track-fill { display: block; height: 100%; width: 0; border-radius: 999px; background: linear-gradient(90deg, var(--lv-easy), #5ad69a); transition: width 0.35s; }
.kv-track-label { font-size: 0.82rem; font-weight: 800; color: var(--kv-muted); white-space: nowrap; min-width: 44px; text-align: right; }

.kv-qcard { background: var(--white); border: 1.5px solid var(--kv-line); border-radius: 20px; padding: 18px 20px 20px; box-shadow: var(--shadow-sm); }
.kv-q-head { display: flex; align-items: center; gap: 8px; min-height: 30px; }
.kv-q-new { height: 24px; line-height: 24px; padding: 0 9px; border-radius: 999px; font-size: 0.75rem; font-weight: 800; color: #8E6EF0; background: #f1ecff; }
.kv-q-new.retry { color: #d9480f; background: #fff0e6; }
.kv-zhan {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px; height: 40px; padding: 0 18px;
  font-family: inherit; font-size: 0.9rem; font-weight: 800; color: #fff; letter-spacing: 0.5px;
  background: linear-gradient(135deg, #8B6BFF, var(--kv-zhan-dark)); border: none; border-radius: 12px; cursor: pointer;
  box-shadow: 0 4px 0 #4128B8; transition: transform 0.1s, box-shadow 0.1s, filter 0.15s;
}
.kv-zhan svg { width: 18px; height: 18px; }
.kv-zhan:hover { filter: brightness(1.08); }
.kv-zhan:active { transform: translateY(3px); box-shadow: 0 1px 0 #4128B8; }
.kv-zhan:disabled { opacity: 0.6; cursor: default; }
.kv-sess-bar .kv-zhan { margin-right: auto; }

.kv-q-prompt { text-align: center; padding: 18px 0 20px; }
.kv-q-ask { font-size: 0.86rem; font-weight: 700; color: var(--kv-muted); margin-bottom: 10px; }
.kv-q-word { display: inline-flex; align-items: center; gap: 12px; font-size: 2.6rem; line-height: 1.2; color: var(--dark); word-break: break-word; }
.kv-say-lg { width: 42px; height: 42px; }
.kv-say-lg svg { width: 22px; height: 22px; }
.kv-q-zh { font-size: 2rem; line-height: 1.3; color: var(--dark); }
.kv-listen {
  width: 96px; height: 96px; border-radius: 50%; border: none; cursor: pointer;
  background: var(--blue); color: #fff; display: inline-grid; place-items: center;
  box-shadow: 0 6px 0 #2f6fd6; transition: transform 0.1s, box-shadow 0.1s;
}
.kv-listen svg { width: 46px; height: 46px; }
.kv-listen:active { transform: translateY(4px); box-shadow: 0 2px 0 #2f6fd6; }

.kv-options { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.kv-opt {
  display: flex; align-items: center; gap: 10px; min-height: 58px; padding: 10px 14px;
  font-family: inherit; font-size: 1.05rem; font-weight: 700; color: var(--dark); text-align: left;
  background: var(--white); border: 2px solid var(--kv-line); border-bottom-width: 4px; border-radius: 14px; cursor: pointer;
  transition: transform 0.1s, border-color 0.15s, background 0.15s;
}
.kv-options.en .kv-opt { font-size: 1.15rem; }
.kv-opt:hover:not(:disabled) { border-color: var(--blue); background: #f5f9ff; }
.kv-opt:active:not(:disabled) { transform: translateY(2px); }
.kv-opt:disabled { cursor: default; }
.kv-opt-key {
  width: 24px; height: 24px; flex-shrink: 0; display: grid; place-items: center;
  font-size: 0.75rem; font-weight: 800; color: var(--kv-muted); border: 1.5px solid var(--kv-line); border-radius: 7px;
}
.kv-opt-text { flex: 1; min-width: 0; word-break: break-word; }
.kv-opt.right { border-color: var(--lv-easy); background: var(--lv-easy-soft); color: #18794e; }
.kv-opt.right .kv-opt-key { border-color: var(--lv-easy); color: var(--lv-easy); }
.kv-opt.wrong { border-color: var(--lv-hard); background: var(--lv-hard-soft); color: #c92a2a; animation: kvShake 0.35s; }
.kv-opt.wrong .kv-opt-key { border-color: var(--lv-hard); color: var(--lv-hard); }
@keyframes kvShake { 25% { transform: translateX(-5px); } 75% { transform: translateX(5px); } }

.kv-reveal { margin-top: 16px; padding-top: 16px; border-top: 1.5px dashed var(--kv-line); animation: kvIn 0.25s ease-out; }
@keyframes kvIn { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }
.kv-reveal-main { display: flex; gap: 16px; align-items: flex-start; }
.kv-reveal-text { flex: 1; min-width: 0; }
.kv-reveal-top { display: flex; gap: 6px; margin-bottom: 6px; }
.kv-verdict { height: 24px; line-height: 24px; padding: 0 10px; border-radius: 999px; font-size: 0.75rem; font-weight: 800; }
.kv-verdict.ok { color: #18794e; background: var(--lv-easy-soft); }
.kv-verdict.no { color: #c92a2a; background: var(--lv-hard-soft); }
.kv-verdict.known { color: #fff; background: var(--lv-easy); }
.kv-reveal-word { display: flex; align-items: center; gap: 8px; font-size: 1.6rem; line-height: 1.3; color: var(--dark); word-break: break-word; }
.kv-reveal-zh { font-size: 1.05rem; font-weight: 700; color: #3d4757; margin-top: 2px; display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.kv-pos { font-size: 0.72rem; font-weight: 700; color: var(--kv-muted); background: #f1f3f7; border-radius: 6px; padding: 1px 6px; }
.kv-reveal-ex { margin-top: 8px; font-size: 0.86rem; font-weight: 600; color: #5a6475; line-height: 1.5; font-style: italic; }
.kv-reveal-img { flex-shrink: 0; }
.kv-reveal-main.hard .kv-img, .kv-reveal-main.hard .kv-gen { width: 190px; height: 190px; }
.kv-reveal-zh.big { font-size: 1.6rem; }

.kv-sess-bar { display: flex; justify-content: flex-end; gap: 10px; margin-top: 14px; min-height: 44px; }

/* 看图选词 / 填词 / 组句 */
.kv-q-img { display: flex; justify-content: center; }
.kv-q-img img { width: 200px; height: 200px; object-fit: cover; border-radius: 18px; border: 1.5px solid var(--kv-line); }
.kv-q-sentence { font-size: 1.5rem; font-weight: 700; color: var(--dark); line-height: 1.6; padding: 0 6px; }
.kv-blank { display: inline-block; min-width: 88px; border-bottom: 3px solid var(--blue); margin: 0 4px; }
.kv-q-sentence-zh { margin-top: 6px; font-size: 0.92rem; font-weight: 600; color: var(--kv-muted); }
.kv-q-sentence-zh.big { font-size: 1.25rem; color: var(--dark); font-weight: 700; }
.kv-hit { color: var(--kv-zhan-dark); font-style: normal; background: var(--kv-zhan-soft); border-radius: 5px; padding: 0 4px; }
.kv-order-line { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; min-height: 52px; padding: 10px; margin-bottom: 14px; border-bottom: 2px dashed var(--kv-line); }
.kv-order-slot { min-width: 54px; height: 40px; border-radius: 10px; background: #f3f5f9; display: inline-grid; place-items: center; padding: 0 10px; font-size: 1.1rem; font-weight: 700; color: var(--dark); }
.kv-order-slot.filled { background: #eef4ff; color: #2f6fd6; animation: kvIn 0.2s ease-out; }
.kv-order-line.done .kv-order-slot { background: var(--lv-easy-soft); color: #18794e; }
.kv-order-line.meh .kv-order-slot { background: var(--lv-medium-soft); color: #8a6100; }
.kv-order-pool { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; }
.kv-tile-btn {
  height: 46px; padding: 0 16px; font-family: inherit; font-size: 1.1rem; font-weight: 700; color: var(--dark);
  background: #fff; border: 2px solid var(--kv-line); border-bottom-width: 4px; border-radius: 12px; cursor: pointer; white-space: nowrap;
}
.kv-tile-btn:hover:not(:disabled) { border-color: var(--blue); }
.kv-tile-btn.used { visibility: hidden; }
.kv-tile-btn.shake { animation: kvShake 0.35s; border-color: var(--lv-hard); }

/* 图片 / AI 配图按钮 */
.kv-img { display: block; width: 150px; height: 150px; padding: 0; border: 1.5px solid var(--kv-line); border-radius: 14px; overflow: hidden; background: #fafbfc; cursor: zoom-in; }
.kv-img img { width: 100%; height: 100%; object-fit: cover; display: block; }
.kv-gen {
  width: 150px; height: 150px; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 8px;
  font-family: inherit; font-size: 0.82rem; font-weight: 800; color: #8E6EF0;
  background: #faf8ff; border: 1.5px dashed #cdbff7; border-radius: 14px; cursor: pointer;
}
.kv-gen svg { width: 26px; height: 26px; }
.kv-gen:hover:not(:disabled) { background: #f1ecff; border-color: #8E6EF0; }
.kv-gen:disabled { cursor: progress; opacity: 0.75; }
.kv-gen.busy svg { animation: kvWiggle 0.8s ease-in-out infinite; }
@keyframes kvWiggle { 50% { transform: rotate(-14deg); } }
.kv-img.sm, .kv-gen.sm { width: 44px; height: 44px; border-radius: 10px; }
.kv-gen.sm { gap: 0; border: none; background: transparent; color: #c3cad6; }
.kv-gen.sm span { display: none; }
.kv-gen.sm svg { width: 18px; height: 18px; }
.kv-gen.sm:hover:not(:disabled) { color: #8E6EF0; background: #f1ecff; }

/* ---------------------------------------------------------------- 小结 -- */
.kv-done { max-width: 560px; margin: 0 auto; }
.kv-done-card { background: var(--white); border: 1.5px solid var(--kv-line); border-radius: 20px; padding: 26px 22px; text-align: center; }
.kv-done-title { font-size: 1.5rem; color: var(--dark); margin-bottom: 18px; }
.kv-done-nums { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; margin-bottom: 14px; }
.kv-done-nums.two { grid-template-columns: repeat(2, 1fr); }
.kv-done-num { display: flex; flex-direction: column; gap: 2px; padding: 12px 6px; background: var(--light); border: 2px solid transparent; border-radius: 14px; font-family: inherit; cursor: pointer; }
.kv-done-num:disabled, .kv-done-num.static { cursor: default; }
.kv-done-num.on { border-color: var(--blue); background: #f2f7ff; }
.kv-done-list { text-align: left; margin-bottom: 14px; }
.kv-done-w .kv-lv { margin-left: auto; }
.kv-done-note { font-size: 0.82rem; font-weight: 700; color: var(--kv-zhan-dark); background: var(--kv-zhan-soft); border-radius: 10px; padding: 8px 12px; margin-bottom: 16px; }
.kv-done-card.flat { border: none; padding: 8px 0; }
.kv-done-nums b { font-size: 1.8rem; line-height: 1.2; color: var(--dark); }
.kv-done-nums span { font-size: 0.8rem; font-weight: 700; color: var(--kv-muted); }
.kv-done-w { display: flex; align-items: center; gap: 10px; padding: 6px 0; border-bottom: 1px solid #f0f2f6; font-size: 0.95rem; }
.kv-done-w b { font-weight: 800; }
.kv-done-w span { color: #5a6475; font-weight: 600; }
.kv-done-btns { display: flex; justify-content: center; gap: 10px; }

/* ================================================================ 词库 == */
.kv-bank-tools { display: flex; gap: 10px; margin-bottom: 12px; }
.kv-bank-tools .kv-input { flex: 1; min-width: 0; }
.kv-bank-chips { margin-bottom: 12px; }
.kv-bulk {
  position: sticky; top: 70px; z-index: 5; display: flex; flex-wrap: wrap; align-items: center; gap: 8px;
  padding: 10px 12px; margin-bottom: 10px; background: #fffbea; border: 1.5px solid #f3e2a3; border-radius: 14px;
}
.kv-bulk-n { font-size: 0.86rem; font-weight: 800; color: var(--dark); margin-right: 4px; white-space: nowrap; }

.kv-list { background: var(--white); border: 1.5px solid var(--kv-line); border-radius: 16px; overflow: hidden; }
.kv-row {
  display: grid; grid-template-columns: 26px 30px minmax(0, 1.6fr) minmax(0, 1fr) auto auto 30px 44px;
  align-items: center; gap: 10px; padding: 8px 12px; border-bottom: 1px solid #f0f2f6;
}
.kv-row:last-child { border-bottom: none; }
.kv-row.sel { background: #f5f9ff; }
.kv-row-head { grid-template-columns: 26px 1fr; background: #fafbfc; padding-top: 6px; padding-bottom: 6px; }
.kv-head-count { font-size: 0.8rem; font-weight: 800; color: var(--kv-muted); }
.kv-check { display: grid; place-items: center; cursor: pointer; }
.kv-check input { position: absolute; opacity: 0; pointer-events: none; }
.kv-check span { width: 18px; height: 18px; border: 2px solid #cfd6e2; border-radius: 5px; background: #fff; }
.kv-check input:checked + span { background: var(--blue) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='3.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M5 13l4 4L19 7'/%3E%3C/svg%3E") center / 13px no-repeat; border-color: var(--blue); }
.kv-row-main { min-width: 0; }
.kv-row-word { font-size: 1rem; font-weight: 800; color: var(--dark); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.kv-row-zh { font-size: 0.84rem; font-weight: 600; color: #5a6475; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.kv-row-zh.editable { cursor: text; border-radius: 6px; }
.kv-row-zh.editable:hover { background: #f3f6fb; }
.kv-auto { font-style: normal; font-size: 0.66rem; font-weight: 800; color: #b7791f; background: #fff4dd; border-radius: 5px; padding: 0 5px; margin-left: 6px; }
.kv-zh-input { width: 100%; height: 26px; font-family: inherit; font-size: 0.84rem; border: 1.5px solid var(--blue); border-radius: 6px; padding: 0 6px; }
.kv-row-topics { font-size: 0.76rem; font-weight: 600; color: var(--kv-muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.kv-star { width: 30px; height: 30px; display: grid; place-items: center; border: none; background: none; color: #c3cad6; cursor: pointer; border-radius: 8px; }
.kv-star svg { width: 20px; height: 20px; }
.kv-star.on { color: #FFB300; }
.kv-star:hover { background: #fff7e0; color: #FFB300; }
.kv-row-img { display: flex; justify-content: center; }
.kv-more { display: flex; justify-content: center; margin-top: 12px; }

/* ============================================================ 本周 Focus == */
.kv-week { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 14px; }
.kv-week-label { display: inline-flex; align-items: center; gap: 8px; font-size: 1.05rem; font-weight: 800; color: var(--dark); white-space: nowrap; }
.kv-week-tag { height: 22px; line-height: 22px; padding: 0 8px; border-radius: 999px; font-size: 0.72rem; font-weight: 800; color: #fff; background: var(--blue); }
.kv-week-progress { margin-left: auto; display: flex; align-items: center; gap: 10px; }
.kv-wp-text { font-size: 0.86rem; font-weight: 700; color: var(--kv-muted); white-space: nowrap; }
.kv-wp-text b { color: var(--dark); }
.kv-wp-bar { width: 140px; height: 10px; border-radius: 999px; background: #eef1f6; overflow: hidden; }
.kv-wp-bar span { display: block; height: 100%; background: var(--lv-easy); border-radius: 999px; }

.kv-focus-actions { display: flex; align-items: center; justify-content: space-between; gap: 10px; flex-wrap: wrap; margin-bottom: 12px; }
.kv-focus-btns { display: flex; gap: 10px; flex-wrap: wrap; }
/* 「新增」按钮：细加号图标 + 文字、1px 虚线边、圆角 8、30 高 13 字，放在列表顶部靠左 */
.kv-add {
  display: inline-flex; align-items: center; gap: 4px; height: 30px; padding: 0 12px;
  font-family: inherit; font-size: 13px; font-weight: 600; color: #5a6475;
  background: var(--white); border: 1px dashed #b8c1cf; border-radius: 8px; cursor: pointer;
}
.kv-add svg { width: 14px; height: 14px; }
.kv-add:hover { color: var(--blue); border-color: var(--blue); }

.kv-picker { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; padding: 12px; margin-bottom: 14px; background: var(--white); border: 1.5px solid var(--kv-line); border-radius: 14px; }
.kv-picker-label { font-size: 0.88rem; font-weight: 800; color: var(--dark); }

.kv-focus-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(170px, 1fr)); gap: 12px; }
.kv-focus-grid .kv-empty { grid-column: 1 / -1; }
.kv-tile { position: relative; display: flex; flex-direction: column; gap: 6px; padding: 12px; background: var(--white); border: 1.5px solid var(--kv-line); border-radius: 16px; }
.kv-tile.st-known { border-color: #bfe8d2; background: #fbfefc; }
.kv-tile-x { position: absolute; top: 6px; right: 6px; z-index: 2; width: 26px; height: 26px; display: grid; place-items: center; border: none; border-radius: 50%; background: rgba(255, 255, 255, 0.9); color: #9aa3b2; cursor: pointer; opacity: 0; transition: opacity 0.15s; }
.kv-tile-x svg { width: 14px; height: 14px; }
.kv-tile:hover .kv-tile-x { opacity: 1; }
.kv-tile-x:hover { color: var(--lv-hard); }
.kv-tile-img { display: flex; justify-content: center; }
.kv-tile-img .kv-img, .kv-tile-img .kv-gen { width: 100%; height: auto; aspect-ratio: 1; }
.kv-tile-letter { width: 100%; aspect-ratio: 1; display: grid; place-items: center; font-family: var(--kv-title); font-size: 2.6rem; font-weight: 700; color: #d5dbe5; background: #f7f9fb; border-radius: 14px; }
.kv-tile-word { display: flex; align-items: center; justify-content: space-between; gap: 6px; font-size: 1.1rem; color: var(--dark); word-break: break-word; }
.kv-tile-zh { font-size: 0.84rem; font-weight: 600; color: #5a6475; min-height: 1.3em; }
.kv-tile-foot { display: flex; gap: 6px; flex-wrap: wrap; margin-top: auto; }

/* ============================================================ 家长确认 == */
.kv-review-top { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-bottom: 14px; padding: 14px 16px; background: var(--white); border: 1.5px solid var(--kv-line); border-left: 5px solid var(--kv-zhan); border-radius: 0 16px 16px 0; }
.kv-review-sum { display: flex; align-items: baseline; gap: 8px; }
.kv-review-sum b { font-family: var(--kv-title); font-size: 2rem; color: var(--kv-zhan-dark); line-height: 1; }
.kv-review-sum span { font-size: 0.9rem; font-weight: 700; color: var(--kv-muted); }
.kv-review-btns { display: flex; gap: 10px; flex-wrap: wrap; }
.kv-days { display: flex; flex-direction: column; gap: 10px; }
.kv-day { background: var(--white); border: 1.5px solid var(--kv-line); border-radius: 16px; overflow: hidden; }
.kv-day-head { width: 100%; display: flex; align-items: center; gap: 14px; padding: 12px 16px; border: none; background: none; font-family: inherit; cursor: pointer; text-align: left; }
.kv-day-head:hover { background: #fafbfd; }
.kv-day-date { display: inline-flex; align-items: center; gap: 6px; font-size: 1rem; font-weight: 800; color: var(--dark); white-space: nowrap; min-width: 92px; }
.kv-day-wd { font-size: 0.75rem; font-weight: 700; color: var(--kv-muted); }
.kv-day-stats { display: flex; flex-wrap: wrap; gap: 6px 14px; flex: 1; min-width: 0; }
.kv-day-stat { font-size: 0.82rem; font-weight: 600; color: var(--kv-muted); white-space: nowrap; }
.kv-day-stat b { color: var(--dark); font-weight: 800; margin-right: 3px; }
.kv-day-pend { height: 26px; line-height: 26px; padding: 0 10px; border-radius: 999px; font-size: 0.78rem; font-weight: 800; color: #fff; background: var(--kv-zhan); white-space: nowrap; }
.kv-day-pend.none { color: #18794e; background: var(--lv-easy-soft); }
.kv-day-chev svg { width: 18px; height: 18px; color: #b6bfcc; transition: transform 0.2s; }
.kv-day.open .kv-day-chev svg { transform: rotate(90deg); }
.kv-day-body { padding: 4px 16px 16px; border-top: 1px solid #f0f2f6; }
.kv-day-actions { display: flex; gap: 10px; flex-wrap: wrap; margin: 12px 0; }
.kv-pend-list { display: flex; flex-direction: column; }
.kv-pend { display: flex; align-items: center; gap: 10px; padding: 8px 0; border-bottom: 1px solid #f3f5f8; }
.kv-pend:last-child { border-bottom: none; }
.kv-pend-main { flex: 1; min-width: 0; display: flex; align-items: baseline; gap: 10px; overflow: hidden; }
.kv-pend-main b { font-size: 1rem; font-weight: 800; color: var(--dark); white-space: nowrap; }
.kv-pend-main span { font-size: 0.86rem; font-weight: 600; color: #5a6475; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.kv-src-tag { font-style: normal; height: 22px; line-height: 22px; padding: 0 8px; border-radius: 999px; font-size: 0.72rem; font-weight: 800; white-space: nowrap; }
.kv-src-tag.src-self { color: var(--kv-zhan-dark); background: var(--kv-zhan-soft); }
.kv-src-tag.src-practice { color: #2f6fd6; background: #e8f0ff; }
.kv-pend-btn { width: 34px; height: 34px; display: grid; place-items: center; flex-shrink: 0; border-radius: 10px; cursor: pointer; border: 1.5px solid var(--kv-line); background: #fff; }
.kv-pend-btn svg { width: 16px; height: 16px; }
.kv-pend-btn.ok { color: #fff; background: var(--lv-easy); border-color: var(--lv-easy); }
.kv-pend-btn.no { color: var(--kv-muted); }
.kv-pend-btn.no:hover { color: var(--lv-hard); border-color: var(--lv-hard); }
.kv-empty.small { padding: 14px 0; font-size: 0.86rem; }
.kv-btn-ok { background: var(--lv-easy); color: #fff; border: 1.5px solid var(--lv-easy); }
.kv-btn-no:hover { color: var(--lv-hard); border-color: var(--lv-hard); }

/* ============================================================ 斩掉特效 == */
.kv-slash-layer { position: fixed; inset: 0; z-index: 450; pointer-events: none; display: none; overflow: hidden; }
.kv-slash-layer.go { display: block; }
.kv-slash-flash { position: absolute; inset: 0; background: radial-gradient(circle at 50% 45%, rgba(124, 92, 255, 0.28), transparent 60%); animation: kvFlash 0.7s ease-out forwards; }
.kv-slash-blade {
  position: absolute; left: -20%; top: 45%; width: 140%; height: 6px; transform-origin: center;
  background: linear-gradient(90deg, transparent, #C9B8FF 30%, #fff 50%, #7CE7FF 70%, transparent);
  box-shadow: 0 0 18px 6px rgba(124, 92, 255, 0.7), 0 0 40px 12px rgba(124, 231, 255, 0.35);
  transform: rotate(-18deg) scaleX(0); animation: kvBlade 0.42s cubic-bezier(.2, .9, .3, 1) forwards;
}
.kv-slash-word { position: absolute; left: 50%; top: 45%; transform: translate(-50%, -50%); font-family: var(--kv-title); font-weight: 700; font-size: clamp(2.4rem, 9vw, 4.6rem); color: var(--dark); }
.kv-slash-word span { position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%); white-space: nowrap; }
.kv-slash-word .top { clip-path: polygon(0 0, 100% 0, 100% 38%, 0 62%); animation: kvHalfTop 0.8s 0.18s ease-in forwards; }
.kv-slash-word .bot { clip-path: polygon(0 62%, 100% 38%, 100% 100%, 0 100%); animation: kvHalfBot 0.8s 0.18s ease-in forwards; }
.kv-slash-badge {
  position: absolute; left: 50%; top: 45%; width: 96px; height: 96px; margin: -48px 0 0 -48px; border-radius: 50%;
  display: grid; place-items: center; font-family: var(--kv-title); font-size: 3rem; font-weight: 900; color: #fff;
  background: linear-gradient(135deg, #9B7CFF, var(--kv-zhan-dark)); box-shadow: 0 0 0 6px rgba(255, 255, 255, 0.9), 0 12px 30px rgba(91, 63, 224, 0.5);
  transform: scale(0) rotate(-20deg); animation: kvBadge 0.9s 0.22s cubic-bezier(.3, 1.6, .5, 1) forwards;
}
.kv-spark { position: absolute; left: 50%; top: 45%; width: 8px; height: 8px; margin: -4px; border-radius: 2px; background: #B9A6FF; opacity: 0; animation: kvSpark 0.7s 0.25s ease-out forwards; }
.kv-spark:nth-child(odd) { background: #7CE7FF; }
@keyframes kvFlash { 0% { opacity: 0; } 25% { opacity: 1; } 100% { opacity: 0; } }
@keyframes kvBlade { 0% { transform: rotate(-18deg) scaleX(0); opacity: 1; } 60% { transform: rotate(-18deg) scaleX(1); opacity: 1; } 100% { transform: rotate(-18deg) scaleX(1); opacity: 0; } }
@keyframes kvHalfTop { to { transform: translate(-62%, -110%) rotate(-10deg); opacity: 0; } }
@keyframes kvHalfBot { to { transform: translate(-38%, 10%) rotate(8deg); opacity: 0; } }
@keyframes kvBadge { 0% { transform: scale(0) rotate(-20deg); opacity: 1; } 55% { transform: scale(1.15) rotate(6deg); opacity: 1; } 80% { transform: scale(1) rotate(0); opacity: 1; } 100% { transform: scale(1) rotate(0); opacity: 0; } }
@keyframes kvSpark { 0% { opacity: 1; transform: rotate(var(--a)) translateX(0); } 100% { opacity: 0; transform: rotate(var(--a)) translateX(var(--d)); } }
@media (prefers-reduced-motion: reduce) { .kv-slash-layer * { animation-duration: 0.01s !important; } }

/* ---------------------------------------------------------- 看大图 / 提示 -- */
.kv-lightbox { position: fixed; inset: 0; z-index: 400; display: grid; place-items: center; background: rgba(20, 26, 38, 0.72); padding: 20px; cursor: zoom-out; }
.kv-lightbox[hidden] { display: none; }
.kv-lightbox img { max-width: min(92vw, 640px); max-height: 86vh; border-radius: 18px; background: #fff; }
.kv-toast {
  position: fixed; left: 50%; bottom: 28px; z-index: 500; transform: translate(-50%, 20px);
  padding: 10px 18px; border-radius: 999px; background: var(--dark); color: #fff; font-size: 0.88rem; font-weight: 700;
  opacity: 0; pointer-events: none; transition: all 0.2s; white-space: nowrap;
}
.kv-toast.show { opacity: 1; transform: translate(-50%, 0); }

/* ============================================================== 手机端 == */
/* 手机端比电脑端更简：数字卡去说明行、词库行只留词 + 状态 + 星、图片按钮缩小 */
@media (max-width: 640px) {
  .kv-tabs { width: 100%; }
  .kv-tab { flex: 1; padding: 0 8px; }
  .kv-stats { gap: 8px; grid-template-columns: repeat(2, 1fr); }
  .kv-stat { min-height: 0; padding: 10px 12px; }
  .kv-stat .v { font-size: 1.5rem; }
  .kv-stat .s { display: none; }
  .kv-level-row { grid-template-columns: 96px 1fr 64px; gap: 8px; padding: 9px 12px; }
  .kv-start { padding: 12px; }
  .kv-start-btns .kv-btn { flex: 1; }

  .kv-qcard { padding: 14px 14px 16px; border-radius: 16px; }
  .kv-q-word { font-size: 2rem; }
  .kv-q-zh { font-size: 1.6rem; }
  .kv-options { grid-template-columns: 1fr; }
  .kv-opt { min-height: 52px; }
  .kv-opt-key { display: none; }
  .kv-reveal-main { flex-direction: column; align-items: center; text-align: center; }
  .kv-reveal-top, .kv-reveal-word, .kv-reveal-zh { justify-content: center; }
  .kv-reveal-ex { display: none; }
  .kv-img, .kv-gen { width: 120px; height: 120px; }
  .kv-sess-bar .kv-btn, .kv-sess-bar .kv-zhan { flex: 1; }
  .kv-sess-bar .kv-zhan { margin-right: 0; }
  .kv-done-nums { grid-template-columns: repeat(2, 1fr); }
  .kv-q-sentence { font-size: 1.2rem; }
  .kv-q-img img { width: 160px; height: 160px; }
  .kv-row.ro { grid-template-columns: 12px minmax(0, 1fr) auto 24px; }
  .kv-row.ro .kv-lv { grid-column: 1; }
  .kv-row.ro .kv-row-main { grid-column: 2; }
  .kv-day-head { flex-wrap: wrap; gap: 6px 10px; }
  .kv-day-stats { order: 3; flex-basis: 100%; }
  .kv-day-chev { margin-left: auto; }
  .kv-pend .kv-lv, .kv-pend .kv-src-tag { display: none; }
  .kv-review-btns .kv-btn { flex: 1; }

  .kv-row { grid-template-columns: 26px 12px minmax(0, 1fr) auto 30px; gap: 8px; padding: 8px 10px; }
  .kv-row .kv-say, .kv-row-topics, .kv-row-img { display: none; }
  /* 难度在手机上只留一个色点，排在词前面 */
  .kv-row .kv-lv { order: -1; grid-column: 2; grid-row: 1; width: 12px; height: 12px; padding: 0; background: none !important; font-size: 0; gap: 0; }
  .kv-row .kv-lv i { width: 10px; height: 10px; background: var(--lv); }
  .kv-row .kv-lv em { display: none; }
  .kv-row .kv-check { grid-column: 1; grid-row: 1; }
  .kv-row-main { grid-column: 3; grid-row: 1; }
  .kv-row-head { grid-template-columns: 26px 1fr; }
  .kv-bulk { top: 62px; }
  .kv-week-progress { margin-left: 0; width: 100%; }
  .kv-wp-bar { flex: 1; }
  .kv-focus-grid { grid-template-columns: repeat(2, 1fr); gap: 8px; }
  .kv-tile { padding: 10px; }
  .kv-tile-x { opacity: 1; }
  .kv-tile-foot .kv-lv { display: none; }
  .kv-learner-label { display: none; }
}