/* ==========================================================================
 * lab-suite.css — 理科工具套件（初中物理 / 化学 / 数学）统一视觉
 * 风格：实验台 · 仪器面板（直角、细网格、等宽数字、顶部强调线）
 * 说明：颜色全部基于全站 --c-* 变量，暗色模式由 [data-theme="dark"] 自动继承
 * ========================================================================== */

:root {
    --lab-accent: #4f46e5;
    --lab-accent-soft: rgba(79, 70, 229, .09);
    --lab-accent2: #0e9f8e;
    --lab-accent2-soft: rgba(14, 159, 142, .10);
    --lab-warn: #b45309;
    --lab-warn-soft: rgba(180, 83, 9, .10);
    --lab-danger: #dc2626;
    --lab-danger-soft: rgba(220, 38, 38, .09);
    --lab-ok: #15803d;
    --lab-ok-soft: rgba(21, 128, 61, .10);
    --lab-line: var(--c-border, #e5e9f0);
    --lab-ink: var(--c-text, #111827);
    --lab-sub: var(--c-text-sub, #4b5563);
    --lab-mute: var(--c-text-muted, #9ca3af);
    --lab-panel: var(--c-bg-card, #fff);
    --lab-soft: var(--c-surface-soft, rgba(15, 23, 42, .035));
    --lab-bg: var(--c-bg, #f7f8fb);
    --lab-radius: 6px;
    --lab-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}

:root[data-theme="dark"] {
    --lab-accent: #818cf8;
    --lab-accent-soft: rgba(129, 140, 248, .16);
    --lab-accent2: #2dd4bf;
    --lab-accent2-soft: rgba(45, 212, 191, .14);
    --lab-warn: #fbbf24;
    --lab-warn-soft: rgba(251, 191, 36, .14);
    --lab-danger: #f87171;
    --lab-danger-soft: rgba(248, 113, 113, .14);
    --lab-ok: #4ade80;
    --lab-ok-soft: rgba(74, 222, 128, .13);
    --lab-panel: var(--c-bg-card, #131c31);
    --lab-soft: rgba(255, 255, 255, .045);
    --lab-bg: var(--c-bg, #0b1221);
}

.lab {
    background:
        linear-gradient(var(--lab-soft) 1px, transparent 1px) 0 0 / 100% 26px,
        var(--lab-bg);
    padding: 22px 0 40px;
    color: var(--lab-ink);
}

.lab-wrap {
    max-width: 1160px;
    margin: 0 auto;
    padding: 0 18px;
}

/* ---------- 顶部：一句话说清用途 + 公式徽标，紧接工具 ---------- */
.lab-top { padding: 6px 0 18px; }
.lab-crumb { font-size: 12px; color: var(--lab-mute); margin-bottom: 10px; }
.lab-crumb a { color: var(--lab-mute); text-decoration: none; }
.lab-crumb a:hover { color: var(--lab-accent); }
.lab-crumb .sep { margin: 0 6px; }

.lab-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    font-size: 11px;
    font-weight: 800;
    letter-spacing: .12em;
    text-transform: uppercase;
    color: var(--lab-accent2);
    margin-bottom: 8px;
}
.lab-eyebrow::before {
    content: "";
    width: 22px;
    height: 2px;
    background: var(--lab-accent2);
    display: inline-block;
}

.lab-h1 {
    font-size: clamp(22px, 3.1vw, 31px);
    line-height: 1.3;
    font-weight: 900;
    letter-spacing: -.01em;
    margin: 0 0 8px;
}
.lab-h1 em { font-style: normal; color: var(--lab-accent); }
.lab-lead {
    font-size: 14.5px;
    line-height: 1.85;
    color: var(--lab-sub);
    max-width: 760px;
    margin: 0 0 12px;
}
.lab-formulas { display: flex; flex-wrap: wrap; gap: 8px; }
.lab-formulas code {
    font-family: var(--lab-mono);
    font-size: 12.5px;
    font-weight: 700;
    background: var(--lab-soft);
    border: 1px solid var(--lab-line);
    border-left: 2px solid var(--lab-accent);
    border-radius: 0 4px 4px 0;
    padding: 5px 10px;
    color: var(--lab-ink);
    white-space: nowrap;
}

/* ---------- 工作区 ---------- */
.lab-grid {
    display: grid;
    grid-template-columns: minmax(0, 380px) minmax(0, 1fr);
    gap: 16px;
    align-items: start;
}
@media (max-width: 900px) {
    .lab-grid { grid-template-columns: 1fr; }
}

.lab-panel {
    background: var(--lab-panel);
    border: 1px solid var(--lab-line);
    border-radius: var(--lab-radius);
    overflow: hidden;
    position: relative;
}
.lab-panel::before {
    content: "";
    position: absolute;
    inset: 0 0 auto 0;
    height: 2px;
    background: linear-gradient(90deg, var(--lab-accent), var(--lab-accent2));
    opacity: .9;
}
.lab-panel + .lab-panel { margin-top: 14px; }

.lab-panel-head {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 15px;
    border-bottom: 1px solid var(--lab-line);
    background: var(--lab-soft);
}
.lab-panel-head b {
    font-size: 13px;
    font-weight: 900;
    letter-spacing: .04em;
}
.lab-panel-head span {
    margin-left: auto;
    font-size: 11.5px;
    color: var(--lab-mute);
    font-family: var(--lab-mono);
}
.lab-body { padding: 15px; }

/* ---------- 表单 ---------- */
.lab-field { margin-bottom: 12px; }
.lab-field:last-child { margin-bottom: 0; }
.lab-label {
    display: flex;
    align-items: baseline;
    gap: 6px;
    font-size: 12px;
    font-weight: 800;
    color: var(--lab-sub);
    margin-bottom: 5px;
}
.lab-label i {
    font-style: normal;
    font-family: var(--lab-mono);
    font-size: 11px;
    color: var(--lab-mute);
    margin-left: auto;
}
.lab-input,
.lab-select {
    width: 100%;
    box-sizing: border-box;
    font-family: var(--lab-mono);
    font-size: 14px;
    font-weight: 700;
    color: var(--lab-ink);
    background: var(--lab-panel);
    border: 1px solid var(--lab-line);
    border-radius: 4px;
    padding: 9px 10px;
    outline: none;
    transition: border-color .15s, box-shadow .15s;
}
.lab-input::placeholder { color: var(--lab-mute); font-weight: 500; }
.lab-input:focus,
.lab-select:focus {
    border-color: var(--lab-accent);
    box-shadow: 0 0 0 3px var(--lab-accent-soft);
}
.lab-input.is-bad { border-color: var(--lab-danger); }

.lab-inline { display: flex; gap: 8px; }
.lab-inline > * { flex: 1; min-width: 0; }
.lab-inline > .lab-unit { flex: 0 0 92px; }

.lab-row { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.lab-row > .lab-btn { flex: 1 1 auto; }

/* ---------- 按钮 ---------- */
.lab-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    font-family: inherit;
    font-size: 13.5px;
    font-weight: 800;
    letter-spacing: .02em;
    border: 1px solid var(--lab-line);
    background: var(--lab-panel);
    color: var(--lab-ink);
    border-radius: 4px;
    padding: 10px 16px;
    cursor: pointer;
    transition: all .15s;
    text-decoration: none;
}
.lab-btn:hover { border-color: var(--lab-accent); color: var(--lab-accent); }
.lab-btn:active { transform: translateY(1px); }
.lab-btn-main {
    background: var(--lab-accent);
    border-color: var(--lab-accent);
    color: #fff;
}
.lab-btn-main:hover { background: var(--lab-accent2); border-color: var(--lab-accent2); color: #fff; }
.lab-btn-ghost { background: transparent; }
.lab-btn-sm { font-size: 12px; padding: 7px 11px; font-weight: 700; }
.lab-btn-block { width: 100%; }
.lab-btn:disabled { opacity: .5; cursor: not-allowed; }

/* ---------- 分段 / 标签 ---------- */
.lab-chips { display: flex; flex-wrap: wrap; gap: 6px; }
.lab-chip {
    font-family: inherit;
    font-size: 12.5px;
    font-weight: 700;
    color: var(--lab-sub);
    background: var(--lab-panel);
    border: 1px solid var(--lab-line);
    border-radius: 4px;
    padding: 6px 11px;
    cursor: pointer;
}
.lab-chip:hover { border-color: var(--lab-accent); color: var(--lab-accent); }
.lab-chip.on {
    background: var(--lab-accent);
    border-color: var(--lab-accent);
    color: #fff;
}

.lab-tabs {
    display: flex;
    gap: 0;
    border-bottom: 1px solid var(--lab-line);
    overflow-x: auto;
}
.lab-tab {
    font-family: inherit;
    font-size: 13px;
    font-weight: 800;
    color: var(--lab-mute);
    background: none;
    border: 0;
    border-bottom: 2px solid transparent;
    padding: 10px 14px;
    cursor: pointer;
    white-space: nowrap;
}
.lab-tab.on { color: var(--lab-accent); border-bottom-color: var(--lab-accent); }

/* ---------- 结果区 ---------- */
.lab-out {
    display: flex;
    align-items: flex-end;
    gap: 8px;
    padding: 16px 15px 14px;
    border-bottom: 1px dashed var(--lab-line);
}
.lab-out .k {
    font-size: 11.5px;
    font-weight: 800;
    letter-spacing: .08em;
    color: var(--lab-mute);
    text-transform: uppercase;
    margin-bottom: 3px;
}
.lab-out .v {
    font-family: var(--lab-mono);
    font-size: clamp(30px, 5vw, 42px);
    font-weight: 800;
    line-height: 1;
    letter-spacing: -.02em;
    color: var(--lab-accent);
    word-break: break-all;
}
.lab-out .u {
    font-family: var(--lab-mono);
    font-size: 14px;
    font-weight: 700;
    color: var(--lab-sub);
    padding-bottom: 3px;
}
.lab-out-main { flex: 1; min-width: 0; }
.lab-out-side { flex: none; }

.lab-kv {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(128px, 1fr));
    gap: 0;
    border-bottom: 1px solid var(--lab-line);
}
.lab-kv > div {
    padding: 10px 14px;
    border-right: 1px solid var(--lab-line);
    min-width: 0;
}
.lab-kv > div:last-child { border-right: 0; }
.lab-kv .k { font-size: 11px; color: var(--lab-mute); font-weight: 800; margin-bottom: 3px; }
.lab-kv .v {
    font-family: var(--lab-mono);
    font-size: 14.5px;
    font-weight: 700;
    word-break: break-all;
}

.lab-steps { padding: 14px 15px; }
.lab-steps-title {
    font-size: 11.5px;
    font-weight: 900;
    letter-spacing: .1em;
    color: var(--lab-mute);
    text-transform: uppercase;
    margin-bottom: 8px;
}
.lab-steps ol { margin: 0; padding-left: 0; list-style: none; counter-reset: step; }
.lab-steps li {
    position: relative;
    counter-increment: step;
    padding: 0 0 10px 27px;
    font-size: 13px;
    line-height: 1.85;
    color: var(--lab-sub);
    font-family: var(--lab-mono);
    word-break: break-word;
}
.lab-steps li::before {
    content: counter(step);
    position: absolute;
    left: 0;
    top: 2px;
    width: 18px;
    height: 18px;
    border: 1px solid var(--lab-line);
    border-radius: 50%;
    font-size: 10.5px;
    font-weight: 800;
    color: var(--lab-mute);
    display: grid;
    place-items: center;
    font-family: var(--lab-mono);
}
.lab-steps li:last-child { padding-bottom: 0; }
.lab-steps li b { color: var(--lab-ink); }

.lab-badge {
    display: inline-block;
    font-size: 11.5px;
    font-weight: 800;
    padding: 3px 9px;
    border-radius: 999px;
    background: var(--lab-soft);
    color: var(--lab-sub);
}
.lab-badge.ok { background: var(--lab-ok-soft); color: var(--lab-ok); }
.lab-badge.warn { background: var(--lab-warn-soft); color: var(--lab-warn); }
.lab-badge.bad { background: var(--lab-danger-soft); color: var(--lab-danger); }
.lab-badge.acc { background: var(--lab-accent-soft); color: var(--lab-accent); }

.lab-note {
    font-size: 12px;
    line-height: 1.85;
    color: var(--lab-mute);
}
.lab-note b { color: var(--lab-sub); }

/* ---------- 表格 ---------- */
.lab-table { width: 100%; border-collapse: collapse; font-size: 12.5px; }
.lab-table th {
    text-align: left;
    font-size: 10.5px;
    font-weight: 900;
    letter-spacing: .06em;
    text-transform: uppercase;
    color: var(--lab-mute);
    padding: 8px 10px;
    border-bottom: 1px solid var(--lab-line);
    white-space: nowrap;
}
.lab-table td {
    padding: 7px 10px;
    border-bottom: 1px dashed var(--lab-line);
    color: var(--lab-sub);
    vertical-align: top;
}
.lab-table td.mono { font-family: var(--lab-mono); color: var(--lab-ink); font-weight: 700; }
.lab-table tr:last-child td { border-bottom: 0; }
.lab-table tr.hl td { background: var(--lab-accent-soft); }
.lab-scroll { overflow-x: auto; }

.lab-empty {
    padding: 34px 18px;
    text-align: center;
    font-size: 12.5px;
    color: var(--lab-mute);
    line-height: 1.9;
}
.lab-empty b { display: block; color: var(--lab-sub); font-size: 13.5px; margin-bottom: 3px; }

/* ---------- AI 区块 ---------- */
.lab-ai { border-top: 1px solid var(--lab-line); padding: 13px 15px; background: var(--lab-soft); }
.lab-ai-head { display: flex; align-items: center; gap: 8px; margin-bottom: 8px; }
.lab-ai-head b { font-size: 12.5px; font-weight: 900; }
.lab-ai-head .dot {
    width: 7px; height: 7px; border-radius: 50%;
    background: var(--lab-accent2);
    box-shadow: 0 0 0 3px var(--lab-accent2-soft);
}
.lab-ai-body {
    font-size: 13px;
    line-height: 1.95;
    color: var(--lab-sub);
    white-space: pre-wrap;
    word-break: break-word;
    max-height: 320px;
    overflow-y: auto;
}
.lab-ai-body:empty { display: none; }
.lab-ai-body strong { color: var(--lab-ink); }

/* ---------- 正文 / FAQ ---------- */
.lab-content { margin-top: 26px; }
.lab-sec {
    background: var(--lab-panel);
    border: 1px solid var(--lab-line);
    border-radius: var(--lab-radius);
    padding: 20px 22px;
    margin-bottom: 14px;
}
.lab-sec h2 {
    font-size: 17px;
    font-weight: 900;
    margin: 0 0 10px;
    padding-left: 11px;
    border-left: 3px solid var(--lab-accent);
    line-height: 1.4;
}
.lab-sec h3 { font-size: 14px; font-weight: 900; margin: 16px 0 6px; }
.lab-sec p { font-size: 13.5px; line-height: 2; color: var(--lab-sub); margin: 0 0 10px; }
.lab-sec p:last-child { margin-bottom: 0; }
.lab-sec ul, .lab-sec ol { font-size: 13.5px; line-height: 2; color: var(--lab-sub); margin: 0 0 10px; padding-left: 20px; }
.lab-sec b { color: var(--lab-ink); }
.lab-sec code {
    font-family: var(--lab-mono);
    font-size: 12.5px;
    background: var(--lab-soft);
    border: 1px solid var(--lab-line);
    border-radius: 3px;
    padding: 1px 5px;
}

details.lab-faq {
    border-top: 1px solid var(--lab-line);
    padding: 12px 0;
}
details.lab-faq:first-of-type { border-top: 0; }
details.lab-faq summary {
    font-size: 13.5px;
    font-weight: 800;
    cursor: pointer;
    list-style: none;
    display: flex;
    gap: 8px;
    align-items: flex-start;
}
details.lab-faq summary::-webkit-details-marker { display: none; }
details.lab-faq summary::before {
    content: "Q";
    font-family: var(--lab-mono);
    font-size: 10.5px;
    font-weight: 900;
    color: var(--lab-accent);
    border: 1px solid var(--lab-accent);
    border-radius: 3px;
    padding: 1px 4px;
    margin-top: 2px;
    flex: none;
}
details.lab-faq p {
    margin: 8px 0 0 30px;
    font-size: 13px;
    line-height: 1.95;
    color: var(--lab-sub);
}

.lab-links { display: flex; flex-wrap: wrap; gap: 8px; }
.lab-links a {
    font-size: 12.5px;
    font-weight: 700;
    color: var(--lab-sub);
    text-decoration: none;
    border: 1px solid var(--lab-line);
    border-radius: 4px;
    padding: 7px 12px;
    background: var(--lab-panel);
}
.lab-links a:hover { color: var(--lab-accent); border-color: var(--lab-accent); }

/* ---------- 打印 ---------- */
.lab-print-area { display: none; }
@media print {
    body { background: #fff !important; }
    .lab-top, .lab-grid, .lab-content, .lab-noprint, .lab-ai, .lab-print-tip { display: none !important; }
    .lab-print-area { display: block !important; }
    .lab { background: #fff !important; padding: 0 !important; }
    .lab-print-sheet { color: #000; font-family: "Times New Roman", "Songti SC", serif; }
    .lab-print-sheet h2 { text-align: center; font-size: 19px; margin: 0 0 4px; letter-spacing: 2px; }
    .lab-print-sheet .ps-meta {
        display: flex; justify-content: space-between;
        font-size: 11.5px; color: #444; margin-bottom: 10px;
        border-bottom: 1px solid #999; padding-bottom: 6px;
    }
    .lab-print-sheet h3 { font-size: 13px; margin: 12px 0 4px; }
    .lab-print-sheet p, .lab-print-sheet li { font-size: 12px; line-height: 1.9; }
    .lab-print-sheet table { width: 100%; border-collapse: collapse; font-size: 11.5px; }
    .lab-print-sheet th, .lab-print-sheet td {
        border: 1px solid #999; padding: 4px 6px; text-align: left;
    }
    @page { size: A4; margin: 14mm; }
}

/* 小屏微调 */
@media (max-width: 560px) {
    .lab-wrap { padding: 0 12px; }
    .lab-h1 { font-size: 21px; }
    .lab-lead { font-size: 13.5px; }
    .lab-out .v { font-size: 30px; }
    .lab-panel-head { padding: 10px 12px; }
    .lab-body { padding: 12px; }
    .lab-sec { padding: 16px; }
}