/* =====================================================================
 * N14 / 39 · LangChain 速查 —— 独立皮肤「靛蓝代码手册」
 * 通栏检索台 + 左侧 sticky 目录树 + 右侧代码卡墙（深色代码区）。
 * 主题：只消费公共导航写入的 <html data-theme>，不自建开关。
 * ===================================================================== */

.lc-page {
    --nx-bg:        #f6f8fc;
    --nx-bg-2:      #eef1f9;
    --nx-surface:   #ffffff;
    --nx-surface-2: #f3f5fb;
    --nx-surface-3: #e8ecf7;
    --nx-ink:       #151b30;
    --nx-ink-2:     #4b5575;
    --nx-ink-3:     #858fae;
    --nx-line:      #dce1ef;
    --nx-line-2:    #e9edf7;
    --nx-a:         #3b4ea8;
    --nx-b:         #d1742b;
    --nx-tint:      #e7eafb;
    --nx-deep:      #2d3d86;
    --lc-code-bg:   #131a2e;
    --lc-code-fg:   #dbe3f8;
    --tsk-card: #ffffff; --tsk-line: #dce1ef; --tsk-faint: #858fae; --tsk-sub: #4b5575; --tsk-ink: #151b30;
}
:root[data-theme="dark"] .lc-page {
    --nx-bg:        #0b101b;
    --nx-bg-2:      #101728;
    --nx-surface:   #161f33;
    --nx-surface-2: #1c2740;
    --nx-surface-3: #24314e;
    --nx-ink:       #eef2ff;
    --nx-ink-2:     #aab5d3;
    --nx-ink-3:     #7d89aa;
    --nx-line:      #2a3654;
    --nx-line-2:    #202b43;
    --nx-a:         #9aa8ff;
    --nx-b:         #eeb06a;
    --nx-tint:      rgba(154, 168, 255, .16);
    --nx-deep:      #c3cbff;
    --lc-code-bg:   #0b1122;
    --lc-code-fg:   #dbe3f8;
    --tsk-card: #161f33; --tsk-line: #2a3654; --tsk-faint: #7d89aa; --tsk-sub: #aab5d3; --tsk-ink: #eef2ff;
}

.lc-page .n14-hero h1 em { color: var(--nx-a); }
.lc-hero { grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr); align-items: start; }
.lc-searchbox { background: var(--nx-surface); border: 1px solid var(--nx-line); border-top: 3px solid var(--nx-b); border-radius: 16px; padding: 20px; box-shadow: var(--nx-sh); }
.lc-search { font-size: 17px; padding: 12px 15px; }
.lc-cats { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 13px; }
.lc-cats button { font-size: 12.5px; font-weight: 650; cursor: pointer; border-radius: 999px; padding: 5px 12px; background: var(--nx-surface-2); border: 1px solid var(--nx-line); color: var(--nx-ink-2); }
.lc-cats button[aria-pressed="true"] { background: var(--nx-a); border-color: var(--nx-a); color: #fff; }
.lc-searchmeta { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px; margin-top: 13px; font-size: 11.5px; color: var(--nx-ink-3); }
.lc-searchmeta span:first-child { color: var(--nx-deep); font-weight: 750; }

/* 目录 + 卡片墙 */
.lc-body { display: grid; grid-template-columns: 216px minmax(0, 1fr); gap: 20px; margin-top: 34px; align-items: start; }
.lc-toc { position: sticky; top: 14px; background: var(--nx-surface); border: 1px solid var(--nx-line); border-radius: 14px; padding: 16px; }
.lc-toc__cap { font-family: var(--nx-mono); font-size: 11px; letter-spacing: .14em; text-transform: uppercase; color: var(--nx-ink-3); margin-bottom: 12px; }
.lc-toc ul { list-style: none; padding: 0; margin: 0; }
.lc-toc li { margin-bottom: 3px; }
.lc-toc a { display: flex; justify-content: space-between; gap: 6px; padding: 7px 9px; border-radius: 8px; border: 0; color: var(--nx-ink-2); font-size: 13px; }
.lc-toc a:hover { background: var(--nx-tint); color: var(--nx-deep); border: 0; }
.lc-toc a b { font-family: var(--nx-mono); font-size: 11px; color: var(--nx-ink-3); }
.lc-toc__note { margin-top: 14px; padding-top: 12px; border-top: 1px solid var(--nx-line-2); }
.lc-cards { min-width: 0; }
.lc-group { margin-bottom: 26px; scroll-margin-top: 16px; }
.lc-group__cap { display: flex; align-items: baseline; gap: 10px; margin-bottom: 12px; padding-bottom: 9px; border-bottom: 2px solid var(--nx-line); }
.lc-group__cap h2 { font-size: 20px; }
.lc-group__cap span { font-family: var(--nx-mono); font-size: 11.5px; color: var(--nx-ink-3); }
.lc-card { background: var(--nx-surface); border: 1px solid var(--nx-line); border-radius: 13px; overflow: hidden; margin-bottom: 12px; }
.lc-card__head { display: flex; flex-wrap: wrap; align-items: center; gap: 9px; padding: 12px 16px; border-bottom: 1px solid var(--nx-line-2); }
.lc-card__head h3 { font-size: 16px; font-family: var(--nx-sans); letter-spacing: 0; flex: 1 1 200px; }
.lc-card__fav { background: none; border: 0; cursor: pointer; font-size: 17px; color: var(--nx-ink-3); line-height: 1; padding: 3px; }
.lc-card__fav[aria-pressed="true"] { color: var(--nx-b); }
.lc-card__desc { padding: 11px 16px 0; font-size: 13px; line-height: 1.75; color: var(--nx-ink-2); }
.lc-card__code { margin: 11px 16px 0; background: var(--lc-code-bg); color: var(--lc-code-fg); border-radius: 10px; padding: 13px 15px; font-family: var(--nx-mono); font-size: 12px; line-height: 1.75; white-space: pre-wrap; word-break: break-word; overflow-x: auto; max-height: 320px; overflow-y: auto; }
.lc-card__foot { display: flex; flex-wrap: wrap; gap: 7px; padding: 11px 16px 14px; }
.lc-card__foot .n14-btn { min-height: 30px; padding: 5px 10px; font-size: 11.5px; }
.lc-note { margin-top: 9px; font-size: 12px; line-height: 1.7; color: var(--nx-ink-3); }

.lc-split { align-items: start; }
.lc-codearea { font-family: var(--nx-mono); font-size: 12.5px; min-height: 160px; }
.lc-checkout { min-height: 160px; max-height: 300px; overflow: auto; }
.lc-issue { border-left: 3px solid var(--nx-b); background: var(--nx-surface-2); border-radius: 0 8px 8px 0; padding: 9px 12px; margin-bottom: 8px; font-size: 12.5px; line-height: 1.7; }
.lc-issue b { color: var(--nx-deep); }

@media (max-width: 980px) {
    .lc-hero { grid-template-columns: 1fr; }
    .lc-body { grid-template-columns: 1fr; }
    .lc-toc { position: static; }
    .lc-toc ul { display: flex; flex-wrap: wrap; gap: 5px; }
}