/* ======================================================================
 *  分解质因数 prime-factorization.css
 *  依赖 calc-common.css，仅补充专属结构。
 * ====================================================================== */

.pf-textarea {
    width: 100%;
    min-height: 88px;
    border-radius: var(--radius-md, 12px);
    border: 1.5px solid var(--c-border);
    background: var(--c-surface-soft);
    padding: 12px 14px;
    font-size: 18px;
    font-weight: 700;
    font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
    color: var(--c-text);
    resize: vertical;
    transition: border-color .16s ease, box-shadow .16s ease;
}
.pf-textarea:focus {
    outline: none;
    border-color: var(--c-primary);
    box-shadow: 0 0 0 3px rgba(0, 150, 220, .12);
}
.pf-btn-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 4px; }
.pf-btn-row .btn { flex: 1 1 30%; min-width: 96px; }

.pf-error {
    border-radius: 12px;
    padding: 12px 14px;
    font-size: 13px;
    font-weight: 700;
    line-height: 1.7;
    color: #e0447c;
    background: rgba(224, 68, 124, .07);
    border: 1px dashed rgba(224, 68, 124, .35);
    margin-bottom: 14px;
}

/* ---------- 结果卡片 ---------- */
.pf-result { display: flex; flex-direction: column; gap: 16px; }
.pf-card {
    background: var(--c-bg-card);
    border: 1px solid var(--c-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    padding: 18px;
}
.pf-card.is-prime {
    border-color: rgba(245, 166, 35, .55);
    background: linear-gradient(180deg, rgba(245, 166, 35, .06), var(--c-bg-card) 40%);
}
.pf-card-head {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 12px;
}
.pf-n-label {
    font-size: 19px;
    font-weight: 800;
    color: var(--c-text);
    font-variant-numeric: tabular-nums;
    word-break: break-all;
}
.pf-tag {
    font-size: 11.5px;
    font-weight: 800;
    padding: 3px 10px;
    border-radius: 999px;
    white-space: nowrap;
}
.tag-prime { color: #b5770a; background: rgba(245, 166, 35, .15); }
.tag-comp { color: var(--c-primary-dark, #0a7fc0); background: rgba(0, 150, 220, .1); }
.tag-sq { color: #1f9d43; background: rgba(52, 199, 89, .12); }
.tag-big { color: #7c5cd6; background: rgba(124, 92, 214, .12); }
.pf-copy-one {
    margin-left: auto;
    border: 1px solid var(--c-border);
    background: var(--c-surface-soft);
    color: var(--c-text-sub);
    border-radius: 999px;
    padding: 5px 13px;
    font-size: 12px;
    font-weight: 700;
    cursor: pointer;
    transition: all .15s ease;
}
.pf-copy-one:hover { border-color: var(--c-primary); color: var(--c-primary); }
.pf-copy-one.copied {
    border-color: rgba(31, 157, 67, .55);
    background: rgba(52, 199, 89, .1);
    color: #1f9d43;
}

/* ---------- 分解式 ---------- */
.pf-expr {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
    padding: 14px;
    border-radius: 12px;
    background: var(--c-surface-soft);
    margin-bottom: 14px;
}
.pf-factor {
    display: inline-flex;
    align-items: baseline;
    gap: 1px;
    font-size: 24px;
    font-weight: 800;
    color: var(--c-primary-dark, #0a7fc0);
    font-variant-numeric: tabular-nums;
    word-break: break-all;
}
.pf-factor b {
    font-size: 13px;
    color: #e0447c;
    margin-left: 1px;
}
.pf-x { font-size: 17px; font-weight: 800; color: var(--c-text-muted); }

/* ---------- 指标 ---------- */
.pf-metrics {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
    gap: 10px;
    margin-bottom: 14px;
}
.pf-metric {
    border: 1px solid var(--c-border);
    border-radius: 11px;
    padding: 10px 12px;
    display: flex;
    flex-direction: column;
    gap: 3px;
}
.pf-metric .k { font-size: 12px; color: var(--c-text-muted); font-weight: 700; }
.pf-metric .v { font-size: 17px; font-weight: 800; color: var(--c-text); font-variant-numeric: tabular-nums; word-break: break-all; }

/* ---------- 折叠详情 ---------- */
.pf-detail {
    border-top: 1px dashed var(--c-border);
    padding: 10px 0 2px;
}
.pf-detail summary {
    cursor: pointer;
    font-size: 13.5px;
    font-weight: 800;
    color: var(--c-text-sub);
    padding: 4px 0;
    user-select: none;
    list-style: none;
}
.pf-detail summary::-webkit-details-marker { display: none; }
.pf-detail summary::before { content: '▸ '; color: var(--c-primary); }
.pf-detail[open] summary::before { content: '▾ '; }
.pf-steps-wrap { overflow-x: auto; margin-top: 8px; }
.pf-steps { border-collapse: collapse; width: 100%; min-width: 280px; }
.pf-steps td {
    padding: 7px 10px;
    text-align: center;
    font-size: 15px;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
    border-bottom: 1px solid var(--c-border);
    color: var(--c-text);
}
.pf-steps td:first-child { color: var(--c-text-muted); font-size: 12.5px; }
.pf-steps td.pf-p { color: #e0447c; }
.pf-divisors {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: 10px;
}
.pf-div {
    font-size: 13px;
    font-weight: 700;
    padding: 4px 10px;
    border-radius: 8px;
    background: var(--c-surface-soft);
    border: 1px solid var(--c-border);
    color: var(--c-text-sub);
    font-variant-numeric: tabular-nums;
}
.pf-note { font-size: 12.5px; color: var(--c-text-muted); margin: 8px 0 0; }

/* ---------- 100 以内质数表 ---------- */
.pf-prime-table {
    margin-top: 10px;
    padding: 14px 16px;
    border-radius: 10px;
    background: var(--c-bg-soft, #f6f7fb);
    border: 1px solid var(--c-border);
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: 14.5px;
    line-height: 2;
    letter-spacing: .5px;
    color: var(--c-text-sub);
    text-align: center;
    font-variant-numeric: tabular-nums;
    word-break: break-all;
}

/* ---------- 黑夜模式 ---------- */
[data-theme="dark"] .pf-error {
    background: rgba(224, 68, 124, .13);
    border-color: rgba(224, 68, 124, .4);
    color: #ff7ab0;
}
[data-theme="dark"] .tag-prime { color: #f0b64a; background: rgba(245, 166, 35, .16); }
[data-theme="dark"] .tag-sq { color: #4ede78; }
[data-theme="dark"] .tag-big { color: #a58cf0; background: rgba(124, 92, 214, .18); }
[data-theme="dark"] .pf-factor { color: #58bdf0; }

@media (max-width: 620px) {
    .pf-factor { font-size: 20px; }
    .pf-n-label { font-size: 17px; }
}