:root {
    --c-primary:    #F07226;
    --c-primary-d:  #D95D10;
    --c-accent2:    #FF6B35;
    --c-bg:         #FFF8F3;
    --c-surface:    #FFFFFF;
    --c-text:       #1A1209;
    --c-text-2:     #5C4033;
    --c-text-muted: #9C7B6B;
    --c-border:     rgba(240,114,38,.14);
    --radius-md:    16px;
    --radius-lg:    24px;
    --radius-xl:    36px;
    --font-head:    'Outfit', sans-serif;
    --font-body:    'DM Sans', sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: var(--font-body); background: var(--c-bg); color: var(--c-text); line-height: 1.7; }
h1,h2,h3 { font-family: var(--font-head); }
a { color: var(--c-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── HERO ── */
.doc-hero {
    padding: 60px 0 52px;
    background: linear-gradient(160deg, #FFF4EB 0%, #FFF8F3 55%, #FFF2E5 100%);
    position: relative; overflow: hidden; border-bottom: 1px solid var(--c-border);
}
.doc-hero::before {
    content: ''; position: absolute; top: -70px; right: -50px;
    width: 320px; height: 320px; border-radius: 50%;
    background: radial-gradient(circle, rgba(240,114,38,.08), transparent 68%);
    pointer-events: none;
}
.hero-inner { position: relative; z-index: 1; }
.eyebrow {
    display: inline-flex; align-items: center; gap: 6px;
    font-family: var(--font-head); font-weight: 700; font-size: .72rem;
    letter-spacing: 1.3px; text-transform: uppercase;
    color: var(--c-primary); background: rgba(240,114,38,.09);
    border: 1px solid rgba(240,114,38,.2); border-radius: 99px;
    padding: 4px 12px; margin-bottom: 16px;
}
.doc-hero h1 {
    font-size: clamp(1.8rem, 3.8vw, 2.8rem);
    font-weight: 900; letter-spacing: -1.2px; line-height: 1.15;
    color: var(--c-text); margin-bottom: 12px;
}
.doc-hero h1 .hl {
    background: linear-gradient(120deg, var(--c-primary-d), var(--c-accent2));
    -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.doc-meta {
    font-size: .83rem; color: var(--c-text-muted);
    display: flex; align-items: center; gap: 6px; flex-wrap: wrap;
}
.doc-meta i { font-size: .82rem; color: var(--c-primary); }

/* ── LAYOUT ── */
/* ── LAYOUT ── */
.doc-section { padding: 56px 0 80px; }

/* 1. 实现侧边栏随动固定的核心 */
.col-lg-3 {
    /* 确保父列有高度，sticky 元素才能在父容器内“粘住” */
    position: relative;
}

.toc-wrap {
    position: sticky;
    top: 100px; /* 当距离浏览器顶部 100px 时固定，根据你的 Header 高度调整 */
    align-self: start; /* 必须：防止 flex 容器拉伸导致 sticky 失效 */
    transition: top 0.3s;
}

.toc-card {
    background: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: var(--radius-lg);
    padding: 22px 20px;
}

.toc-title {
    font-family: var(--font-head); font-weight: 700; font-size: .78rem;
    letter-spacing: 1px; text-transform: uppercase;
    color: var(--c-text-muted); margin-bottom: 14px;
}

/* 2. 增强高亮样式 */
.toc-list { list-style: none; }
.toc-list li { margin-bottom: 4px; }
.toc-list a {
    display: block; padding: 8px 12px;
    border-radius: var(--radius-md);
    font-family: var(--font-head); font-weight: 600; font-size: .82rem;
    color: var(--c-text-2); transition: all 0.2s ease;
    border-left: 3px solid transparent; /* 预留边框位置 */
}

.toc-list a:hover {
    background: rgba(240,114,38,.05);
    color: var(--c-primary);
    text-decoration: none;
}

/* 激活状态：背景色 + 字体变色 + 左侧橙色条 */
.toc-list a.active {
    background: rgba(240,114,38,.12) !important;
    color: var(--c-primary-d) !important;
    border-left-color: var(--c-primary);
    padding-left: 15px; /* 激活时稍微向右移动，增加动感 */
}

/* Prose */
.doc-prose { max-width: 720px; }
.doc-block { margin-bottom: 44px; }
.doc-block:last-child { margin-bottom: 0; }

.block-num {
    display: inline-flex; align-items: center; justify-content: center;
    width: 28px; height: 28px; border-radius: 8px;
    background: linear-gradient(135deg, var(--c-primary), var(--c-accent2));
    color: #fff; font-family: var(--font-head); font-weight: 800;
    font-size: .72rem; flex-shrink: 0; margin-bottom: 10px;
}
.block-heading {
    font-family: var(--font-head); font-weight: 800;
    font-size: 1.05rem; color: var(--c-text);
    margin-bottom: 12px; padding-bottom: 10px;
    border-bottom: 1.5px solid var(--c-border);
    display: flex; align-items: center; gap: 10px;
}
.block-body { font-size: .9rem; color: var(--c-text-2); line-height: 1.82; }
.block-body p { margin-bottom: 10px; }
.block-body p:last-child { margin-bottom: 0; }
.block-body ul { margin: 10px 0 10px 18px; }
.block-body ul li { margin-bottom: 6px; }
.block-body strong { color: var(--c-text); font-weight: 600; }

/* Highlight box */
.hl-box {
    background: rgba(240,114,38,.06);
    border: 1px solid rgba(240,114,38,.18);
    border-radius: var(--radius-md);
    padding: 16px 18px;
    font-size: .87rem; color: var(--c-text-2); line-height: 1.72;
    margin: 14px 0;
}
.hl-box i { color: var(--c-primary); margin-right: 5px; }

/* Contact inline */
.contact-inline {
    display: inline-flex; align-items: center; gap: 6px;
    background: rgba(240,114,38,.08); border: 1px solid rgba(240,114,38,.18);
    border-radius: 8px; padding: 3px 10px;
    font-family: var(--font-head); font-weight: 700; font-size: .83rem;
    color: var(--c-primary-d);
}

/* Back to top */
.back-top {
    display: inline-flex; align-items: center; gap: 6px;
    font-family: var(--font-head); font-weight: 600; font-size: .82rem;
    color: var(--c-text-muted); cursor: pointer; border: none; background: none; padding: 0;
    transition: color .2s;
}
.back-top:hover { color: var(--c-primary); }

@media(max-width:991px){
    .toc-wrap { position: static; margin-bottom: 28px; }
}
[dir=rtl] .block-body ul { margin-left: 0; margin-right: 18px; }
[dir=rtl] .doc-meta { flex-direction: row-reverse; }
[dir=rtl] .toc-list a.active { border-left-color: transparent; border-right: 3px solid var(--c-primary); padding-right: 15px; padding-left: 12px; }
/* 强制解除父级 overflow 对 sticky 的封印 */
html, body, .doc-section, .container, .row {
    overflow: visible !important;
}

/* 如果你的页面确实需要防止横向滚动，请使用最新的 clip 属性，它不会破坏 sticky */
body {
    overflow-x: clip !important;
}

/* 确保 sticky 的父级必须有相对定位 */
.col-lg-3 {
    position: relative !important;
}