/*!
 * 物理公式查询 —— 工具样式（力学 / 电学 / 光学）
 * 与站点其它工具页保持一致，并完整适配黑夜模式。
 */

.pf-wrap { max-width: 100%; }

/* ---------------- 工具条 ---------------- */
.pf-toolbar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 10px;
    padding: 14px 16px;
    border: 1px solid var(--c-border, #eef1f6);
    border-radius: 16px;
    background: var(--c-bg-card, #fff);
    margin-bottom: 14px;
}

.pf-search {
    position: relative;
    flex: 1 1 230px;
    min-width: 190px;
}

.pf-search input {
    width: 100%;
    height: 38px;
    padding: 0 12px 0 34px;
    font-size: 14px;
    color: var(--c-text, #0f172a);
    border: 1px solid var(--c-border, #e2e8f0);
    border-radius: 10px;
    background: var(--c-surface-soft, #f7f9fc);
    outline: none;
    transition: border-color .15s, box-shadow .15s;
}

.pf-search input:focus {
    border-color: var(--c-primary, #0066ff);
    box-shadow: 0 0 0 3px rgba(0, 102, 255, .12);
}

.pf-search .ico {
    position: absolute;
    left: 11px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 14px;
    opacity: .6;
    pointer-events: none;
}

.pf-tabs {
    display: inline-flex;
    flex-wrap: wrap;
    gap: 6px;
    padding: 3px;
    border-radius: 10px;
    background: var(--c-surface-soft, #f1f5f9);
    border: 1px solid var(--c-border, #e2e8f0);
}

.pf-tabs button {
    padding: 6px 13px;
    font-size: 13px;
    font-weight: 600;
    color: var(--c-text-sub, #475569);
    background: transparent;
    border: 0;
    border-radius: 8px;
    cursor: pointer;
    transition: all .15s;
}

.pf-tabs button.is-active { color: #fff; background: var(--c-primary, #0066ff); }

.pf-btn {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    height: 38px;
    padding: 0 13px;
    font-size: 13px;
    font-weight: 600;
    color: var(--c-text-sub, #475569);
    background: var(--c-surface-soft, #f1f5f9);
    border: 1px solid var(--c-border, #e2e8f0);
    border-radius: 10px;
    cursor: pointer;
    transition: all .15s;
}

.pf-btn:hover { border-color: var(--c-primary, #0066ff); color: var(--c-primary, #0066ff); }
.pf-btn.is-active { color: #fff; background: #f59f00; border-color: #f59f00; }

.pf-meta {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-left: auto;
    font-size: 12.5px;
    color: var(--c-text-muted, #94a3b8);
}

.pf-meta b { color: var(--c-primary, #0066ff); font-variant-numeric: tabular-nums; }

/* ---------------- 分区 ---------------- */
.pf-sec { margin-bottom: 22px; }

.pf-sec-t {
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 0 0 12px;
    padding-left: 10px;
    font-size: 16px;
    font-weight: 800;
    color: var(--c1, #0066ff);
    border-left: 4px solid var(--c1, #0066ff);
}

.pf-sec-icon { font-size: 17px; }

.pf-sec-t em {
    margin-left: 2px;
    padding: 1px 8px;
    font-size: 11.5px;
    font-style: normal;
    font-weight: 700;
    color: var(--c-text-muted, #94a3b8);
    background: var(--c-surface-soft, #f1f5f9);
    border-radius: 999px;
}

.pf-items { display: flex; flex-direction: column; gap: 8px; }

/* ---------------- 公式卡片 ---------------- */
.pf-item {
    position: relative;
    border: 1px solid var(--c-border, #eef1f6);
    border-radius: 12px;
    background: var(--c-bg-card, #fff);
    transition: border-color .15s, box-shadow .15s;
}

.pf-item:hover { border-color: rgba(0, 102, 255, .35); }
.pf-item.is-open { border-color: var(--c-primary, #0066ff); box-shadow: 0 6px 20px rgba(0, 0, 0, .06); }

.pf-head {
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
    padding: 11px 46px 11px 13px;
    text-align: left;
    background: transparent;
    border: 0;
    border-radius: 12px;
    cursor: pointer;
    font-family: inherit;
}

.pf-cat {
    flex: 0 0 auto;
    padding: 2px 9px;
    font-size: 11px;
    font-weight: 700;
    color: #fff;
    background: var(--c1, #0066ff);
    border-radius: 6px;
}

.pf-name {
    flex: 0 0 auto;
    max-width: 40%;
    font-size: 14.5px;
    font-weight: 700;
    color: var(--c-text, #0f172a);
}

.pf-quick {
    flex: 1 1 auto;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-size: 14px;
    color: var(--c-text-sub, #475569);
    font-family: "Cambria Math", "Times New Roman", Georgia, serif;
}

.pf-arrow {
    flex: 0 0 auto;
    margin-left: auto;
    font-size: 12px;
    color: var(--c-text-muted, #94a3b8);
    transition: transform .18s;
}

.pf-item.is-open .pf-arrow { transform: rotate(180deg); }

.pf-star {
    position: absolute;
    top: 8px;
    right: 10px;
    width: 28px;
    height: 28px;
    font-size: 16px;
    line-height: 1;
    color: var(--c-text-muted, #94a3b8);
    background: transparent;
    border: 0;
    border-radius: 8px;
    cursor: pointer;
    transition: color .15s, transform .15s;
}

.pf-star:hover { transform: scale(1.15); }
.pf-star.is-on { color: #f59f00; }

/* 展开区 */
.pf-body {
    display: none;
    padding: 0 14px 14px;
    border-top: 1px dashed var(--c-border, #eef1f6);
}

.pf-item.is-open .pf-body { display: block; }

.pf-formula {
    margin: 14px 0;
    padding: 14px 16px;
    font-size: 19px;
    line-height: 1.9;
    text-align: center;
    color: var(--c-text, #0f172a);
    background: var(--c-surface-soft, #f7f9fc);
    border-radius: 10px;
    font-family: "Cambria Math", "Times New Roman", Georgia, serif;
    overflow-x: auto;
}

.pf-formula i { font-style: italic; }
.pf-formula sub { font-size: .68em; }
.pf-formula sup { font-size: .68em; }

.pf-block { margin-bottom: 13px; }

.pf-block-t {
    margin-bottom: 7px;
    font-size: 12px;
    font-weight: 700;
    color: var(--c-text-muted, #94a3b8);
}

.pf-vars { width: 100%; border-collapse: collapse; font-size: 13px; }

.pf-vars th {
    padding: 6px 10px;
    text-align: left;
    font-size: 11.5px;
    font-weight: 700;
    color: var(--c-text-muted, #94a3b8);
    background: var(--c-surface-soft, #f7f9fc);
}

.pf-vars td {
    padding: 7px 10px;
    border-bottom: 1px solid var(--c-border, #eef1f6);
    color: var(--c-text-sub, #475569);
    vertical-align: top;
}

.pf-vars tbody tr:last-child td { border-bottom: 0; }

.pf-var {
    width: 88px;
    font-family: "Cambria Math", "Times New Roman", Georgia, serif;
    font-size: 15px;
    color: var(--c-text, #0f172a) !important;
}

.pf-unit { width: 120px; color: var(--c-text-muted, #94a3b8) !important; font-size: 12.5px; }

.pf-others { margin: 0; padding-left: 20px; }

.pf-others li {
    margin-bottom: 4px;
    font-size: 13px;
    line-height: 1.8;
    color: var(--c-text-sub, #475569);
    font-family: "Cambria Math", "Times New Roman", Georgia, serif;
}

.pf-note {
    padding: 11px 13px;
    font-size: 13px;
    line-height: 1.8;
    color: var(--c-text-sub, #475569);
    background: rgba(0, 102, 255, .05);
    border-left: 3px solid var(--c-primary, #0066ff);
    border-radius: 0 8px 8px 0;
}

.pf-note b { display: block; margin-bottom: 3px; color: var(--c-text, #0f172a); }

.pf-body-actions { margin-top: 12px; }

.pf-copy {
    padding: 6px 13px;
    font-size: 12.5px;
    font-weight: 600;
    color: var(--c-primary, #0066ff);
    background: transparent;
    border: 1px solid rgba(0, 102, 255, .35);
    border-radius: 8px;
    cursor: pointer;
    transition: all .15s;
}

.pf-copy:hover { color: #fff; background: var(--c-primary, #0066ff); }

/* ---------------- 空状态 ---------------- */
.pf-empty {
    padding: 46px 16px;
    text-align: center;
    border: 1px dashed var(--c-border, #dbe3ef);
    border-radius: 14px;
    color: var(--c-text-muted, #94a3b8);
}

.pf-empty .emoji { font-size: 38px; margin-bottom: 10px; }
.pf-empty p { font-size: 13.5px; line-height: 1.7; }

/* ---------------- 常量表 ---------------- */
.pf-consts {
    margin-top: 26px;
    padding: 16px 18px;
    border: 1px solid var(--c-border, #eef1f6);
    border-radius: 16px;
    background: var(--c-bg-card, #fff);
}

.pf-consts h3 {
    margin: 0 0 12px;
    font-size: 15px;
    font-weight: 800;
    color: var(--c-text, #0f172a);
}

.pf-consts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
    gap: 8px;
}

.pf-const {
    display: flex;
    align-items: baseline;
    gap: 8px;
    padding: 8px 11px;
    font-size: 13px;
    background: var(--c-surface-soft, #f7f9fc);
    border-radius: 9px;
}

.pf-const .n { flex: 0 0 auto; font-weight: 600; color: var(--c-text, #0f172a); }

.pf-const .s {
    flex: 0 0 auto;
    font-family: "Cambria Math", "Times New Roman", Georgia, serif;
    font-style: italic;
    color: var(--c-primary, #0066ff);
}

.pf-const .v { margin-left: auto; text-align: right; color: var(--c-text-sub, #475569); font-size: 12.5px; }

/* ---------------- 轻提示 ---------------- */
.pf-toast {
    position: fixed;
    left: 50%;
    bottom: 40px;
    transform: translate(-50%, 16px);
    padding: 10px 20px;
    font-size: 13.5px;
    font-weight: 600;
    color: #fff;
    background: rgba(15, 23, 42, .92);
    border-radius: 999px;
    opacity: 0;
    pointer-events: none;
    transition: opacity .2s, transform .2s;
    z-index: 999;
}

.pf-toast.is-show { opacity: 1; transform: translate(-50%, 0); }

/* ---------------- 响应式 ---------------- */
@media (max-width: 640px) {
    .pf-toolbar { padding: 12px; }
    .pf-meta { margin-left: 0; }
    .pf-head { flex-wrap: wrap; padding-right: 44px; }
    .pf-name { max-width: 100%; }
    .pf-quick { flex-basis: 100%; width: 100%; font-size: 13px; }
    .pf-formula { font-size: 16px; padding: 12px; }
    .pf-vars { font-size: 12px; }
    .pf-unit { width: 86px; }
}

/* ---------------- 黑夜模式 ---------------- */
[data-theme="dark"] .pf-toolbar,
[data-theme="dark"] .pf-item,
[data-theme="dark"] .pf-consts {
    background: var(--c-bg-card, #131c31);
    border-color: rgba(255, 255, 255, .08);
}

[data-theme="dark"] .pf-search input {
    background: rgba(255, 255, 255, .04);
    border-color: rgba(255, 255, 255, .12);
    color: var(--c-text, #e5e7eb);
}

[data-theme="dark"] .pf-tabs { background: rgba(255, 255, 255, .04); border-color: rgba(255, 255, 255, .1); }
[data-theme="dark"] .pf-tabs button { color: var(--c-text-sub, #9ca3af); }
[data-theme="dark"] .pf-tabs button.is-active { color: #fff; }

[data-theme="dark"] .pf-btn {
    color: var(--c-text-sub, #9ca3af);
    background: rgba(255, 255, 255, .04);
    border-color: rgba(255, 255, 255, .12);
}

[data-theme="dark"] .pf-btn:hover { color: #58bdf0; border-color: #58bdf0; }
[data-theme="dark"] .pf-btn.is-active { color: #fff; }

[data-theme="dark"] .pf-sec-t em { background: rgba(255, 255, 255, .06); }
[data-theme="dark"] .pf-item:hover { border-color: rgba(88, 189, 240, .5); }
[data-theme="dark"] .pf-item.is-open { border-color: #58bdf0; box-shadow: 0 6px 20px rgba(0, 0, 0, .4); }

[data-theme="dark"] .pf-formula,
[data-theme="dark"] .pf-vars th,
[data-theme="dark"] .pf-const {
    background: rgba(255, 255, 255, .04);
}

[data-theme="dark"] .pf-note { background: rgba(88, 189, 240, .1); border-left-color: #58bdf0; }

[data-theme="dark"] .pf-copy { color: #58bdf0; border-color: rgba(88, 189, 240, .45); }
[data-theme="dark"] .pf-copy:hover { color: #04121f; background: #58bdf0; }

[data-theme="dark"] .pf-empty { border-color: rgba(255, 255, 255, .16); }