/* ====== 02 盈亏问题计算器 · 账本蓝 + 珊瑚橙 ====== */
.tsk.plp{
  --tsk-bg:#f4f7fb;
  --tsk-card:#ffffff;
  --tsk-card-2:#f7fafd;
  --tsk-ink:#1c2a3a;
  --tsk-sub:#52657a;
  --tsk-faint:#8b9bad;
  --tsk-line:#dde6f0;
  --tsk-line-2:#edf2f8;
  --tsk-brand:#2f6da3;
  --tsk-brand-2:#22527c;
  --tsk-brand-soft:#e7f0f8;
  --tsk-brand-ink:#22527c;
  --tsk-coral:#d9643f;
  --tsk-coral-soft:#fbeee8;
  --tsk-shadow-sm:0 1px 2px rgba(28,42,58,.05),0 8px 18px rgba(28,42,58,.06);
  --tsk-shadow:0 2px 8px rgba(28,42,58,.08),0 22px 48px rgba(28,42,58,.10);
  background:
    linear-gradient(180deg, rgba(47,109,163,.06) 0, transparent 260px),
    repeating-linear-gradient(0deg, transparent 0 31px, rgba(47,109,163,.035) 31px 32px),
    var(--tsk-bg);
}
:root[data-theme="dark"] .tsk.plp{
  --tsk-bg:#0e141c;
  --tsk-card:#151d28;
  --tsk-card-2:#1a2430;
  --tsk-ink:#e8eff7;
  --tsk-sub:#a5b5c7;
  --tsk-faint:#7a8b9d;
  --tsk-line:#27333f;
  --tsk-line-2:#1f2a36;
  --tsk-brand:#6aa9dd;
  --tsk-brand-2:#8bc1ec;
  --tsk-brand-soft:rgba(106,169,221,.14);
  --tsk-brand-ink:#8bc1ec;
  --tsk-coral:#ff9b7a;
  --tsk-coral-soft:rgba(255,155,122,.13);
}

/* ---- 首屏等高栅格 ---- */
.plp-hero{display:grid;grid-template-columns:minmax(0,1fr) 394px;gap:30px;padding:30px 0 24px;align-items:stretch}
.plp-hero-l{display:flex;flex-direction:column}
.plp-hero-l>.tsk-hs{flex:1 1 auto}
@media (max-width:900px){.plp-hero{grid-template-columns:1fr}}
.plp-hero-l .tsk-h1 b{color:var(--tsk-coral)}

/* ---- 账本右侧 ---- */
.plp-ledger{background:var(--tsk-card);border:1px solid var(--tsk-line);border-radius:15px;
  box-shadow:var(--tsk-shadow);padding:17px 19px 14px;position:relative;overflow:hidden}
.plp-ledger::before{content:"";position:absolute;left:0;top:0;bottom:0;width:5px;
  background:linear-gradient(180deg,var(--tsk-coral),var(--tsk-brand))}
.plp-ledger::after{content:"= ?";position:absolute;right:14px;bottom:4px;font:800 36px/1 var(--tsk-num);
  color:var(--tsk-brand-soft);pointer-events:none}
.plp-ledger-hd{display:flex;align-items:flex-start;justify-content:space-between;gap:10px;padding-left:4px}
.plp-ledger-hd b{display:block;font-size:14.5px;font-weight:800}
.plp-ledger-hd small{display:block;font-size:11.5px;color:var(--tsk-faint);margin-top:1px}
.plp-stamp{flex:none;border:1.5px solid var(--tsk-coral);color:var(--tsk-coral);border-radius:7px;
  font:800 10px/1 var(--tsk-num);letter-spacing:.14em;padding:6px 8px;transform:rotate(-6deg);opacity:.8}

.plp-cases{display:grid;grid-template-columns:1fr 1fr;gap:6px;margin:13px 0 0;padding-left:4px}
.plp-case{border:1.5px solid var(--tsk-line);border-radius:9px;background:var(--tsk-card-2);
  padding:8px 10px;text-align:left;cursor:pointer;transition:.15s}
.plp-case:hover{border-color:var(--tsk-brand)}
.plp-case.on{border-color:var(--tsk-coral);background:var(--tsk-coral-soft)}
.plp-case b{display:block;font-size:12.5px;font-weight:800;color:var(--tsk-ink)}
.plp-case small{display:block;font-size:10.5px;color:var(--tsk-faint);margin-top:1px}
.plp-case.on b{color:var(--tsk-coral)}

.plp-panel{padding:13px 0 0 4px}
.plp-row2{display:grid;grid-template-columns:1fr 1fr;gap:9px;margin-top:8px}
.plp-field label{display:block;font-size:11.2px;font-weight:800;color:var(--tsk-sub);margin-bottom:4px}
.plp-field input{width:100%;height:38px;border:1.5px solid var(--tsk-line);border-radius:8px;
  background:var(--tsk-card-2);color:var(--tsk-ink);font:800 14px/38px var(--tsk-num);padding:0 10px;outline:none;transition:.15s}
.plp-field input:focus{border-color:var(--tsk-brand);box-shadow:0 0 0 3px var(--tsk-brand-soft)}
.plp-field.bad input{border-color:var(--tsk-coral);background:var(--tsk-coral-soft)}
.plp-note{margin:9px 0 0;font-size:11px;line-height:1.7;color:var(--tsk-faint);
  padding:7px 9px;border-left:2px solid var(--tsk-line);background:var(--tsk-card-2);border-radius:0 6px 6px 0}
.plp-err{display:none;margin-top:9px;padding:8px 11px;border-radius:8px;background:var(--tsk-coral-soft);
  color:var(--tsk-coral);font-size:12px;font-weight:700;line-height:1.65}
.plp-err.show{display:block}
.plp-acts{display:flex;gap:7px;margin-top:12px;padding-left:4px}
.plp-acts .tsk-btn{padding:9px 13px;font-size:12.5px}
.plp-acts .tsk-btn-main{flex:1;background:linear-gradient(135deg,var(--tsk-brand),var(--tsk-brand-2));border:0}
.plp-ledger-foot{margin:9px 0 0;padding-left:4px;font-size:10.5px;line-height:1.65;color:var(--tsk-faint)}

/* ---- 结果 ---- */
.plp-result{margin:6px 0 28px;background:var(--tsk-card);border:1px solid var(--tsk-line);border-radius:17px;
  box-shadow:var(--tsk-shadow);padding:21px 23px 19px}
.plp-res-hd{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:13px}
.plp-res-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(158px,1fr));gap:10px}
.plp-res-card{background:var(--tsk-card-2);border:1px solid var(--tsk-line-2);border-radius:11px;padding:14px 16px 12px}
.plp-res-card b{display:block;font:800 26px/1.12 var(--tsk-num);color:var(--tsk-ink);font-variant-numeric:tabular-nums}
.plp-res-card span{display:block;margin-top:4px;font-size:11.5px;font-weight:800;color:var(--tsk-faint)}
.plp-res-card i{display:block;margin-top:2px;font-style:normal;font-size:10.5px;color:var(--tsk-sub)}
.plp-res-card.plp-main-card{background:var(--tsk-coral-soft);border-color:rgba(217,100,63,.25)}
.plp-res-card.plp-main-card b{color:var(--tsk-coral)}
.plp-alert{margin-top:12px;padding:10px 13px;border-radius:9px;background:var(--tsk-brand-soft);
  border-left:3px solid var(--tsk-brand);font-size:12.5px;line-height:1.8;color:var(--tsk-sub)}
.plp-alert.is-bad{background:var(--tsk-coral-soft);border-left-color:var(--tsk-coral)}

/* ---- 线段图 ---- */
.plp-diagram{margin-top:17px;padding:15px 16px;border:1px dashed var(--tsk-line);border-radius:11px;background:var(--tsk-card-2)}
.plp-diagram h3{margin:0 0 10px;color:var(--tsk-brand-ink)}
.plp-bar-row{display:grid;grid-template-columns:58px 1fr 66px;align-items:center;gap:9px;margin-top:7px}
.plp-bar-row b{font-size:11.5px;font-weight:800;color:var(--tsk-sub)}
.plp-bar{height:14px;border-radius:99px;background:var(--tsk-line-2);overflow:hidden;position:relative}
.plp-bar i{display:block;height:100%;width:0;border-radius:99px;background:linear-gradient(90deg,var(--tsk-brand),var(--tsk-brand-2));transition:width .35s ease}
.plp-bar-row:nth-of-type(3) .plp-bar i{background:linear-gradient(90deg,var(--tsk-coral),#e8885f)}
.plp-bar-row span{font:800 11.5px/1.4 var(--tsk-num);color:var(--tsk-sub);text-align:right}
.plp-bar-note{margin:9px 0 0;font-size:11.5px;line-height:1.7;color:var(--tsk-faint)}

/* ---- 推导 ---- */
.plp-steps-wrap{margin-top:16px;padding-top:14px;border-top:1px dashed var(--tsk-line)}
.plp-steps{margin:9px 0 0;padding:0;list-style:none;counter-reset:plpstep;display:grid;gap:6px}
.plp-steps li{counter-increment:plpstep;position:relative;padding:8px 12px 8px 38px;border-radius:8px;
  background:var(--tsk-card-2);border:1px solid var(--tsk-line-2);font-size:12.8px;line-height:1.75;color:var(--tsk-sub)}
.plp-steps li::before{content:counter(plpstep);position:absolute;left:10px;top:8px;width:19px;height:19px;
  border-radius:5px;background:var(--tsk-brand);color:#fff;font:800 10.5px/19px var(--tsk-num);text-align:center}
.plp-steps li b{color:var(--tsk-ink)}
.plp-sub{margin-left:auto;font-size:11.5px;font-weight:700;color:var(--tsk-faint)}

/* ---- 公式卡 ---- */
.plp-formulas{display:grid;grid-template-columns:repeat(auto-fit,minmax(248px,1fr));gap:10px}
.plp-formula-card{background:var(--tsk-card);border:1px solid var(--tsk-line);border-radius:11px;
  box-shadow:var(--tsk-shadow-sm);padding:15px 16px;border-top:3px solid var(--tsk-brand)}
.plp-chip{display:inline-block;padding:2px 9px;border-radius:99px;background:var(--tsk-brand-soft);
  color:var(--tsk-brand-ink);font:800 11px/1.7 var(--tsk-num)}
.plp-formula-card p{margin:7px 0 8px;font-size:12.5px;line-height:1.7;color:var(--tsk-sub)}
.plp-formula-card code{display:block;padding:8px 10px;border-radius:7px;background:var(--tsk-card-2);
  color:var(--tsk-coral);font:800 11.5px/1.65 var(--tsk-num);word-break:break-all}

/* ---- 变式 ---- */
.plp-var-toolbar{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin-bottom:11px}
.plp-var-tip{font-size:11.5px;color:var(--tsk-faint)}
.plp-variants{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:9px}
.plp-variants .tsk-empty{grid-column:1/-1;background:var(--tsk-card);border:1px dashed var(--tsk-line);border-radius:10px}
.plp-var-item{background:var(--tsk-card);border:1px solid var(--tsk-line);border-radius:10px;padding:12px 14px;
  box-shadow:var(--tsk-shadow-sm);border-left:3px solid var(--tsk-brand)}
.plp-var-item .no{display:inline-block;margin-right:6px;padding:1px 7px;border-radius:99px;
  background:var(--tsk-brand-soft);color:var(--tsk-brand-ink);font:800 10.5px/1.8 var(--tsk-num)}
.plp-var-item .q{font-size:12.8px;line-height:1.8;color:var(--tsk-sub)}
.plp-var-item .q b{color:var(--tsk-ink)}
.plp-var-item .ans{margin-top:6px;padding-top:6px;border-top:1px dashed var(--tsk-line-2);
  font-size:12px;line-height:1.7;color:var(--tsk-coral);font-weight:700}
.plp-var-item .ans.is-hidden{display:none}
.plp-var-item .ans b{color:var(--tsk-coral)}

/* ---- 自测 ---- */
.plp-quiz{background:var(--tsk-card);border:1px solid var(--tsk-line);border-left:4px solid var(--tsk-coral);
  border-radius:12px;box-shadow:var(--tsk-shadow-sm);padding:17px 19px}
.plp-question{margin:0 0 10px;font-size:14px;line-height:1.85;font-weight:700;color:var(--tsk-ink)}
.plp-quiz-row{display:flex;flex-wrap:wrap;gap:8px}
.plp-quiz-row input{width:150px;height:39px;padding:0 11px;border:1.5px solid var(--tsk-line);border-radius:8px;
  background:var(--tsk-card-2);color:var(--tsk-ink);font:800 14px/39px var(--tsk-num);outline:none}
.plp-quiz-row input:focus{border-color:var(--tsk-brand);box-shadow:0 0 0 3px var(--tsk-brand-soft)}
.plp-quiz-fb{margin:8px 0 0;min-height:19px;font-size:12.5px;font-weight:800}
.plp-quiz-fb.ok{color:var(--tsk-brand-ink)}
.plp-quiz-fb.no{color:var(--tsk-coral)}

@media (max-width:900px){
  .plp-hero{grid-template-columns:1fr;gap:22px}
  .plp-ledger::after{display:none}
}
@media (max-width:600px){
  .plp-cases{grid-template-columns:1fr 1fr}
  .plp-res-grid{grid-template-columns:1fr 1fr}
  .plp-bar-row{grid-template-columns:50px 1fr 54px}
  .plp-acts{flex-wrap:wrap}
  .plp-acts .tsk-btn-main{flex:1 0 100%}
}

/* ==========================================================
   *  细节打磨：键盘可达性、长数字换行、打印与动效降级
   *  说明：以下规则都限定在 .tsk 工具作用域内，不影响站内其它页面
   * ========================================================== */
.plp .tsk-btn:focus-visible,
.plp .plp-tab:focus-visible,
.plp .plp-seg button:focus-visible{
    outline:2px solid var(--tsk-brand);
    outline-offset:2px;
}
.plp input[type="number"]::-webkit-outer-spin-button,
.plp input[type="number"]::-webkit-inner-spin-button{
    -webkit-appearance:none;
    margin:0;
}
.plp input[type="number"]{
    -moz-appearance:textfield;
    appearance:textfield;
}
.plp input::placeholder,
.plp textarea::placeholder{
    color:var(--tsk-faint);
    opacity:1;
}
.plp ::selection{
    background:var(--tsk-brand-soft);
    color:var(--tsk-brand-ink);
}
.plp .plp-res-card b,
.plp .plp-main-card b{
    font-variant-numeric:tabular-nums lining-nums;
    letter-spacing:-.01em;
    line-height:1.15;
}
.plp .plp-res-card b{
    overflow-wrap:anywhere;
}
.plp .plp-var-item .q,
.plp .plp-question,
.plp .plp-steps li{
    overflow-wrap:break-word;
    word-break:normal;
}
.plp .plp-table-wrap{
    scrollbar-width:thin;
    scrollbar-color:var(--tsk-line) transparent;
}
.plp .plp-table-wrap::-webkit-scrollbar{
    height:8px;
}
.plp .plp-table-wrap::-webkit-scrollbar-thumb{
    background:var(--tsk-line);
    border-radius:99px;
}
.plp .plp-table-wrap::-webkit-scrollbar-track{
    background:transparent;
}
.plp .plp-var-toolbar .tsk-btn,
.plp .plp-acts .tsk-btn,
.plp .plp-quiz-row .tsk-btn{
    touch-action:manipulation;
}
.plp .plp-var-item{
    transition:border-color .15s,box-shadow .15s;
}
.plp .plp-var-item:hover{
    border-color:var(--tsk-brand);
    box-shadow:var(--tsk-shadow-sm);
}
.plp .plp-panel:not(.on){
    display:none;
}
.plp .plp-result[hidden]{
    display:none;
}
.plp .plp-result{
    animation:plp-rise .28s ease both;
}
@keyframes plp-rise{
    from{opacity:0;transform:translateY(8px)}
    to{opacity:1;transform:none}
}
.plp .plp-alert b{
    font-weight:800;
}
.plp .plp-err.show{
    animation:plp-shake .22s ease;
}
@keyframes plp-shake{
    0%,100%{transform:translateX(0)}
    25%{transform:translateX(-3px)}
    75%{transform:translateX(3px)}
}
.plp .tsk-empty{
    padding:18px 16px;
    text-align:center;
    color:var(--tsk-faint);
    font-size:12.5px;
    line-height:1.8;
}
.plp .plp-quiz-row input:disabled,
.plp .plp-acts .tsk-btn:disabled{
    opacity:.55;
    cursor:not-allowed;
}
.plp .plp-res-grid > .plp-res-card:last-child:nth-child(odd){
    grid-column:span 2;
}
@media (max-width:420px){
    .plp .plp-res-grid{
        grid-template-columns:1fr;
    }
    .plp .plp-res-grid > .plp-res-card:last-child:nth-child(odd){
        grid-column:auto;
    }
    .plp .plp-row2,
    .plp .plp-row3{
        grid-template-columns:1fr;
    }
}
@media (prefers-reduced-motion:reduce){
    .plp *,
    .plp *::before,
    .plp *::after{
        animation-duration:.001ms!important;
        animation-iteration-count:1!important;
        transition-duration:.001ms!important;
        scroll-behavior:auto!important;
    }
}
@media print{
    .plp{
        background:#fff!important;
        color:#111!important;
    }
    .plp .tsk-crumb-bar,
    .plp .plp-acts,
    .plp .plp-var-toolbar,
    .plp .plp-quiz,
    .plp .plp-tabs{
        display:none!important;
    }
    .plp .plp-result{
        box-shadow:none!important;
        border:1px solid #ddd!important;
        animation:none!important;
    }
    .plp .plp-res-grid{
        grid-template-columns:repeat(2,minmax(0,1fr))!important;
    }
    .plp .plp-var-item{
        break-inside:avoid;
    }
    .plp .plp-table{
        font-size:11px!important;
    }
}