/* ============ 种子令牌（Nudges 可调节）· GOV.UK 默认值 ============ */
:root{
  --seed-bg:#ffffff;
  --seed-fg:#0b0c0c;
  --seed-primary:#00703c;   /* GOV.UK 绿 · 主要行动 */
  --seed-accent:#1d70b8;    /* GOV.UK 蓝 · 链接 */
  --seed-surface:#f3f2f1;   /* GOV.UK 灰 · 面板 */
  --seed-radius:0px;
  --seed-density:96px;
  --seed-display:56px;

  /* GOV.UK 基础原色 */
  --govuk-focus:#ffdd00;
  --govuk-error:#d4351c;
  --govuk-black:#0b0c0c;
  --govuk-white:#ffffff;
  --govuk-grey-text:#505a5f;
  --govuk-grey-border:#b1b4b6;

  /* 语义令牌：中性色由种子派生，强调色遵循 GOV.UK */
  --paper:var(--seed-bg);
  --ink:var(--seed-fg);
  --on-ink:var(--seed-bg);
  --action:var(--seed-primary);
  --action-hover:color-mix(in srgb, var(--seed-primary) 80%, black);
  --action-shadow:color-mix(in srgb, var(--seed-primary) 52%, black);
  --on-action:var(--govuk-white);
  --link:var(--seed-accent);
  --link-hover:color-mix(in srgb, var(--seed-accent) 62%, black);
  --surface:var(--seed-surface);
  --muted:color-mix(in srgb, var(--seed-fg) 64%, var(--seed-bg));
  --faint:color-mix(in srgb, var(--seed-fg) 45%, var(--seed-bg));
  --border:color-mix(in srgb, var(--seed-fg) 30%, var(--seed-bg));
  --border-strong:var(--seed-fg);
  --focus:var(--govuk-focus);

  --font-body:"Noto Sans SC",arial,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --font-display:var(--font-body);
  --font-mono:ui-monospace,"SF Mono",Menlo,"Cascadia Mono",Consolas,monospace;
}

/* ============ 基础 ============ */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
section[id]{scroll-margin-top:88px}
body{
  background:var(--paper);
  color:var(--ink);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
img,svg{display:block;max-width:100%}
a{color:var(--link);text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:2px;transition:color .15s ease}
a:hover{color:var(--link-hover);text-decoration-thickness:3px}
button{font-family:inherit;cursor:pointer}
ul{list-style:none}
::selection{background:var(--ink);color:var(--on-ink)}

/* GOV.UK 焦点环：黄色外框 + 黑色内描边 */
a:focus-visible,button:focus-visible,input:focus-visible,textarea:focus-visible,[tabindex]:focus-visible{
  outline:3px solid var(--focus);
  outline-offset:0;
  box-shadow:inset 0 0 0 2px var(--ink);
}

.wrap{max-width:1180px;margin:0 auto;padding:0 28px}
.mono{font-family:var(--font-mono)}

/* 小标签（全大写必须加字距） */
.eyebrow{
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:500;
  text-transform:uppercase;
  letter-spacing:0.08em;
  color:var(--muted);
}

/* 按钮：GOV.UK 绿底 + 底部投影，按下下沉 */
.btn{
  display:inline-flex;align-items:center;gap:8px;
  font-size:16px;font-weight:500;letter-spacing:0;
  padding:12px 24px;
  border-radius:var(--seed-radius);
  border:2px solid transparent;
  text-decoration:none;
  transition:background .15s ease, box-shadow .15s ease, transform .05s ease;
}
.btn:hover{text-decoration:none}
.btn--solid{background:var(--action);color:var(--on-action);box-shadow:0 3px 0 var(--action-shadow)}
.btn--solid:hover{background:var(--action-hover);color:var(--on-action)}
.btn--solid:active{transform:translateY(3px);box-shadow:0 0 0 var(--action-shadow)}
.btn--ghost{background:var(--surface);color:var(--ink);border-color:var(--border);box-shadow:0 3px 0 var(--border)}
.btn--ghost:hover{background:color-mix(in srgb, var(--seed-fg) 8%, var(--seed-bg));color:var(--ink)}
.btn--ghost:active{transform:translateY(3px);box-shadow:0 0 0 var(--border)}
.btn .arr{transition:transform .2s ease}
.btn:hover .arr{transform:translateX(3px)}

/* 滚动显现 */
.reveal{opacity:0;transform:translateY(16px);transition:opacity .6s ease, transform .6s ease}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none;transition:none}
  *{transition:none!important;animation:none!important}
  .fig-curve{stroke-dashoffset:0}
  .fig-area,.fig-pt{opacity:1}
}

/* ============ 导航：GOV.UK 黑色顶栏 + 蓝色下边 ============ */
.site-nav{
  position:sticky;top:0;z-index:50;
  background:var(--govuk-black);
  border-bottom:10px solid var(--link);
}
.site-nav .wrap{display:flex;align-items:center;gap:28px;height:64px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none}
.brand:hover{text-decoration:none}
.seal{
  display:inline-flex;align-items:center;justify-content:center;
  width:28px;height:28px;flex:none;
  background:var(--action);color:var(--govuk-white);
  font-family:var(--font-display);font-size:15px;font-weight:700;line-height:1;
  border-radius:0;
}
.brand .zi{font-family:var(--font-display);font-size:22px;font-weight:700;color:var(--govuk-white);letter-spacing:0}
.brand .en{font-family:var(--font-mono);font-size:10px;letter-spacing:0.14em;color:var(--govuk-grey-border)}
.nav-links{display:flex;gap:4px;margin-left:auto}
.nav-links a{
  color:var(--govuk-white);text-decoration:none;
  font-size:15px;font-weight:500;
  padding:8px 12px;
}
.nav-links a:hover{color:var(--govuk-white);text-decoration:underline;text-decoration-thickness:3px;text-underline-offset:6px}
.nav-links a.current{color:var(--govuk-white);text-decoration:underline;text-decoration-thickness:3px;text-underline-offset:6px}
.nav-search{
  display:flex;align-items:center;gap:8px;
  border:1px solid var(--govuk-grey-text);
  padding:7px 12px;color:var(--govuk-grey-border);
  font-family:var(--font-mono);font-size:11px;letter-spacing:0.04em;
}
.nav-cta{margin-left:4px}
.nav-toggle{display:none;background:none;border:2px solid var(--govuk-white);color:var(--govuk-white);padding:8px 10px;border-radius:0}
.nav-toggle svg{width:18px;height:18px}

/* ============ 开场 ============ */
.opening{
  position:relative;
  background-color:var(--paper);
  background-image:
    linear-gradient(color-mix(in srgb, var(--ink) 5%, transparent) 1px, transparent 1px),
    linear-gradient(90deg, color-mix(in srgb, var(--ink) 5%, transparent) 1px, transparent 1px);
  background-size:36px 36px;
  border-bottom:1px solid var(--border);
  overflow:hidden;
}
.opening .wrap{
  display:grid;grid-template-columns:minmax(0,1.12fr) minmax(0,0.88fr);
  gap:56px;align-items:center;
  padding-top:calc(var(--seed-density) * 0.82);
  padding-bottom:calc(var(--seed-density) * 0.82);
}
.opening h1{
  font-family:var(--font-display);
  font-weight:700;
  font-size:clamp(36px, 5vw, var(--seed-display));
  line-height:1.12;
  letter-spacing:-0.01em;
  margin:20px 0 22px;
  color:var(--ink);
}
.opening h1 em{
  font-style:normal;
  background:linear-gradient(180deg, transparent 60%, color-mix(in srgb, var(--focus) 72%, transparent) 60%);
  padding:0 3px;
  box-decoration-break:clone;
}
.lede{
  max-width:34em;
  font-size:18px;
  line-height:1.7;
  color:var(--muted);
  border-radius:0px;
  padding-right:0px;
  padding-left:0px;
}
.lede strong{color:var(--ink);font-weight:700}
.opening-cta{display:flex;align-items:center;gap:16px;margin-top:30px;flex-wrap:wrap}
.stats{display:flex;gap:0;margin-top:40px;border-top:2px solid var(--border)}
.stats li{flex:1;padding:16px 20px 0 0}
.stats li + li{padding-left:20px;border-left:1px solid var(--border)}
.stats .num{font-family:var(--font-display);font-size:40px;font-weight:700;line-height:1.1;color:var(--ink);font-variant-numeric:tabular-nums}
.stats .lab{font-size:13px;color:var(--muted);margin-top:4px}

/* 精选摘录卡：GOV.UK 灰面板 + 内嵌引文 */
.feature-card{
  position:relative;
  background:var(--surface);
  border:1px solid var(--border);
  border-radius:var(--seed-radius);
  padding:26px 28px 24px;
  transition:border-color .2s ease;
}
.feature-card:hover{border-color:var(--ink)}
.feature-card .tag{
  display:inline-block;
  background:var(--link);color:var(--govuk-white);
  font-size:11px;font-weight:700;letter-spacing:0.06em;text-transform:uppercase;
  padding:3px 9px;margin-bottom:16px;border-radius:0;
}
.feature-card h3{
  font-family:var(--font-display);font-size:22px;font-weight:700;
  line-height:1.35;margin-bottom:12px;color:var(--ink);
}
.feature-card blockquote{
  font-size:15px;line-height:1.7;color:var(--muted);
  border-left:4px solid var(--border);padding-left:14px;
}
.feature-card .fmeta{
  display:flex;align-items:center;gap:10px;margin-top:18px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:0.04em;color:var(--muted);
}
.feature-card .fmeta .sep{width:14px;height:1px;background:var(--border)}
.feature-card .read{
  margin-top:14px;font-size:15px;font-weight:500;
  color:var(--link);text-decoration:underline;text-underline-offset:3px;
  display:inline-flex;align-items:center;gap:6px;
}
.feature-card .read:hover{color:var(--link-hover);text-decoration-thickness:3px}
.feature-card .read .arr{transition:transform .2s ease}
.feature-card .read:hover .arr{transform:translateX(3px)}

/* 竖排侧注 */
.vert-note{
  position:absolute;right:22px;top:50%;transform:translateY(-50%);
  writing-mode:vertical-rl;
  font-family:var(--font-body);font-size:12px;letter-spacing:0.4em;
  color:var(--faint);
  border-right:2px solid var(--border);
  padding-right:12px;
  user-select:none;
}

/* ============ 板块公共 ============ */
section.block{padding:var(--seed-density) 0}
.block-head{display:flex;align-items:flex-end;gap:20px;margin-bottom:44px;flex-wrap:wrap}
.block-head .idx{
  font-family:var(--font-mono);font-size:12px;letter-spacing:0.08em;color:var(--link);
  border:1px solid var(--link);border-radius:0;
  padding:4px 9px;transform:translateY(-6px);
}
.block-head h2{
  font-family:var(--font-display);font-weight:700;
  font-size:clamp(26px, 3vw, 34px);letter-spacing:-0.01em;line-height:1.2;color:var(--ink);
}
.block-head .sub{font-size:15px;color:var(--muted);max-width:30em}
.block-head .rule{flex:1;height:1px;background:var(--border);min-width:60px;transform:translateY(-10px)}

/* ============ 写作方法：章节目录 ============ */
.toc{border-top:2px solid var(--ink)}
.toc-row{
  display:grid;grid-template-columns:88px minmax(0,1fr) auto 40px;
  gap:24px;align-items:center;
  padding:26px 12px;
  border-bottom:1px solid var(--border);
  transition:background .15s ease, box-shadow .15s ease;
  cursor:pointer;
}
.toc-row:hover{background:var(--surface);box-shadow:inset 4px 0 0 var(--link)}
.toc-row .no{
  font-family:var(--font-display);font-size:30px;font-weight:700;
  color:var(--faint);line-height:1;
  transition:color .15s ease;
}
.toc-row:hover .no{color:var(--link)}
.toc-row h3{
  font-family:var(--font-display);font-size:20px;font-weight:700;line-height:1.35;
  color:var(--link);
  text-decoration:underline;text-decoration-color:transparent;text-underline-offset:4px;
}
.toc-row:hover h3{text-decoration-color:var(--link)}
.toc-row p{font-size:14px;color:var(--muted);margin-top:5px;max-width:44em}
.toc-meta{
  text-align:right;font-family:var(--font-mono);font-size:11px;letter-spacing:0.04em;
  color:var(--muted);line-height:2;white-space:nowrap;
}
.toc-meta b{color:var(--ink);font-weight:700}
.toc-row .go{
  font-size:18px;color:var(--faint);transition:transform .15s ease, color .15s ease;
}
.toc-row:hover .go{transform:translateX(5px);color:var(--link)}

/* ============ 精选文章 ============ */
.articles-grid{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,0.95fr);gap:40px;align-items:start}
.lead-article{
  border:1px solid var(--border);border-radius:0;
  background:var(--paper);overflow:hidden;
  transition:border-color .15s ease, transform .15s ease, box-shadow .15s ease;
}
.lead-article:hover{border-color:var(--ink);transform:translateY(-2px);box-shadow:0 4px 0 var(--border)}
.lead-fig{margin:0;aspect-ratio:800/420;background:var(--surface);border-bottom:1px solid var(--border);overflow:hidden}
.lead-fig svg{width:100%;height:100%;display:block}
.fig-grid line{stroke:color-mix(in srgb, var(--ink) 8%, transparent);stroke-width:1}
.fig-act{stroke:var(--border);stroke-width:1.5;stroke-dasharray:3 7}
.fig-axis{stroke:var(--ink);stroke-width:2}
.fig-curve{stroke-dasharray:1300;stroke-dashoffset:1300;transition:stroke-dashoffset 1.6s ease .35s}
.reveal.in .fig-curve{stroke-dashoffset:0}
.fig-area{opacity:0;transition:opacity .8s ease 1.1s}
.reveal.in .fig-area{opacity:1}
.fig-pt{opacity:0;transition:opacity .5s ease 1.35s}
.reveal.in .fig-pt{opacity:1}
.fig-label{font-family:var(--font-mono);font-size:14px;letter-spacing:0.04em;fill:var(--muted)}
.fig-label--peak{fill:var(--action);font-weight:700}
.lead-body{padding:24px 26px 26px}
.cat-chip{
  display:inline-block;font-family:var(--font-mono);font-size:11px;letter-spacing:0.06em;text-transform:uppercase;
  border:1px solid var(--border);border-radius:0;
  padding:3px 9px;color:var(--muted);background:var(--surface);
}
.lead-body h3{
  font-family:var(--font-display);font-size:24px;font-weight:700;
  line-height:1.35;margin:14px 0 10px;
}
.lead-body h3 a{color:var(--link);text-decoration:underline;text-underline-offset:4px}
.lead-body h3 a:hover{color:var(--link-hover);text-decoration-thickness:3px}
.lead-body p{font-size:15px;color:var(--muted);line-height:1.7;max-width:36em}
.ameta{
  display:flex;align-items:center;gap:12px;margin-top:18px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:0.04em;color:var(--muted);
}
.ameta .dot{width:3px;height:3px;border-radius:50%;background:var(--border)}
.article-list{display:flex;flex-direction:column}
.article-item{
  padding:22px 4px;border-bottom:1px solid var(--border);
  transition:background .15s ease;
}
.article-item:first-child{border-top:2px solid var(--ink)}
.article-item:hover{background:var(--surface)}
.article-item h3{
  font-family:var(--font-display);font-size:18px;font-weight:700;
  line-height:1.45;margin:10px 0 6px;
}
.article-item h3 a{color:var(--link);text-decoration:underline;text-underline-offset:3px}
.article-item h3 a:hover{color:var(--link-hover);text-decoration-thickness:3px}
.article-item p{font-size:14px;color:var(--muted);max-width:34em}
.more-link{
  margin-top:26px;display:inline-flex;align-items:center;gap:8px;
  font-size:16px;font-weight:500;
  color:var(--link);text-decoration:underline;text-underline-offset:3px;
}
.more-link:hover{color:var(--link-hover);text-decoration-thickness:3px}
.more-link .arr{transition:transform .2s ease}
.more-link:hover .arr{transform:translateX(4px)}

/* ============ Skills 库 ============ */
.skills-block{
  background:var(--surface);
  border-top:1px solid var(--border);
  border-bottom:1px solid var(--border);
}
.filter-row{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:14px}
.ftab{
  font-size:14px;font-weight:500;letter-spacing:0;
  padding:8px 16px;border-radius:0;
  border:2px solid var(--border);
  background:var(--paper);color:var(--ink);
  transition:border-color .15s ease, background .15s ease, color .15s ease;
}
.ftab small{font-family:var(--font-mono);font-size:10px;margin-left:5px;letter-spacing:0.02em;color:var(--muted)}
.ftab:hover{border-color:var(--ink)}
.ftab.active{background:var(--ink);color:var(--on-ink);border-color:var(--ink)}
.ftab.active small{color:color-mix(in srgb, var(--on-ink) 70%, transparent)}
.skill-count{
  font-family:var(--font-mono);font-size:11px;letter-spacing:0.06em;color:var(--muted);
  margin-bottom:26px;
}
.skill-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}
.scard{
  position:relative;
  border:1px solid var(--border);border-radius:0;
  background:var(--paper);
  padding:22px 22px 18px;
  display:flex;flex-direction:column;gap:10px;
  transition:border-color .15s ease, transform .15s ease, box-shadow .15s ease;
}
.scard:hover{border-color:var(--ink);transform:translateY(-3px);box-shadow:0 3px 0 var(--border)}
.scard .top{display:flex;align-items:center;justify-content:space-between;gap:10px}
.lvl{
  font-family:var(--font-mono);font-size:10px;letter-spacing:0.08em;text-transform:uppercase;
  padding:3px 8px;border-radius:0;white-space:nowrap;
}
.lvl--easy{border:1px solid var(--border);color:var(--muted);background:var(--paper)}
.lvl--mid{background:var(--surface);border:1px solid var(--border);color:var(--ink)}
.lvl--hard{background:var(--ink);color:var(--on-ink);border:1px solid var(--ink)}
.scard h3{font-family:var(--font-display);font-size:18px;font-weight:700;line-height:1.4;color:var(--ink)}
.scard p{font-size:14px;color:var(--muted);line-height:1.7;flex:1}
.scard .tags{display:flex;gap:6px;flex-wrap:wrap}
.scard .tags span{
  font-family:var(--font-mono);font-size:10px;letter-spacing:0.06em;
  border:1px solid var(--border);border-radius:0;
  padding:2px 7px;color:var(--muted);background:var(--surface);
}
.scard .foot{
  display:flex;align-items:center;justify-content:space-between;
  border-top:1px solid var(--border);padding-top:12px;margin-top:2px;
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:0.04em;color:var(--faint);
}
.scard .open{
  font-family:var(--font-body);font-size:13px;font-weight:500;
  color:var(--link);text-decoration:underline;text-underline-offset:2px;
  opacity:0;transform:translateX(-4px);transition:opacity .15s ease, transform .15s ease;
}
.scard:hover .open{opacity:1;transform:none}
.skills-empty{
  display:none;border:1px solid var(--border);border-radius:0;background:var(--paper);
  padding:48px 20px;text-align:center;color:var(--muted);font-size:15px;
}

/* ============ 写作练习：GOV.UK 灰面板 + 绿色行动 ============ */
.practice{
  background:var(--surface);
  border-top:1px solid var(--border);
  border-bottom:1px solid var(--border);
}
.practice .wrap{
  display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);
  gap:56px;align-items:start;
  padding-top:calc(var(--seed-density) * 0.78);
  padding-bottom:calc(var(--seed-density) * 0.78);
}
.practice .eyebrow{color:var(--muted)}
.practice h2{
  font-family:var(--font-display);font-weight:700;
  font-size:clamp(28px, 3.4vw, 40px);letter-spacing:-0.01em;line-height:1.2;
  margin:16px 0 14px;color:var(--ink);
}
.practice .intro{
  font-size:16px;line-height:1.7;max-width:30em;
  color:var(--muted);
}
.prompt-card{
  margin-top:26px;
  background:var(--paper);
  border:1px solid var(--border);
  border-left:6px solid var(--link);
  border-radius:var(--seed-radius);
  padding:22px 24px;
  transition:border-color .15s ease;
}
.prompt-card:hover{border-color:var(--ink)}
.prompt-top{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:14px}
.reroll{
  display:inline-flex;align-items:center;gap:6px;
  font-family:var(--font-body);font-size:14px;font-weight:500;
  color:var(--link);background:none;border:none;border-radius:0;
  text-decoration:underline;text-underline-offset:3px;
  padding:4px 2px;
  transition:color .15s ease;
}
.reroll:hover{color:var(--link-hover);text-decoration-thickness:3px}
.reroll .arr{display:inline-block;transition:transform .35s ease}
.reroll:hover .arr{transform:rotate(180deg)}
.prompt-text{
  font-family:var(--font-display);font-size:22px;font-weight:700;
  line-height:1.5;color:var(--ink);
}
.prompt-hint{
  margin-top:10px;font-size:14px;line-height:1.7;color:var(--muted);
}
.prompt-card.swap .cat-chip,.prompt-card.swap .prompt-text,.prompt-card.swap .prompt-hint{animation:prompt-in .4s ease both}
@keyframes prompt-in{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
.prac-form{display:flex;flex-direction:column;gap:12px}
.prac-form label{
  font-family:var(--font-body);font-size:16px;font-weight:700;
  color:var(--ink);
}
.prac-hintline{
  display:flex;justify-content:space-between;align-items:baseline;gap:12px;
  font-size:13px;color:var(--muted);
}
.char-count{font-family:var(--font-mono);font-size:11px;letter-spacing:0.04em;color:var(--muted)}
.prac-error{
  display:none;
  border-left:5px solid var(--govuk-error);
  background:color-mix(in srgb, var(--govuk-error) 7%, var(--paper));
  padding:10px 14px;font-size:14px;line-height:1.6;color:var(--ink);
}
.prac-error b{color:var(--govuk-error);font-weight:700}
.prac-form textarea.invalid{border-color:var(--govuk-error)}
.prac-form textarea{
  width:100%;resize:vertical;min-height:224px;
  background:var(--paper);
  border:2px solid var(--ink);
  border-radius:0;
  color:var(--ink);
  font-family:var(--font-body);font-size:16px;line-height:1.7;
  padding:14px 16px;
  transition:border-color .15s ease;
}
.prac-form textarea::placeholder{color:var(--faint)}
.prac-form textarea:focus{outline:3px solid var(--focus);outline-offset:0;border-color:var(--ink)}
.prac-actions{display:flex;align-items:center;gap:16px;flex-wrap:wrap}
.fine{
  font-family:var(--font-mono);font-size:11px;letter-spacing:0.04em;
  color:var(--muted);
}
.prac-ok{
  display:none;
  border:4px solid var(--action);border-radius:0;background:var(--paper);
  padding:20px 24px;font-size:15px;line-height:1.7;color:var(--ink);
}
.prac-ok b{font-family:var(--font-display);font-weight:700}
.reroll--inline{margin-top:14px}

/* ============ 文章页 ============ */
.article-page{padding:calc(var(--seed-density) * 0.7) 0 var(--seed-density)}
.article-head{max-width:42em;margin:0 auto}
.article-head .cat-chip{margin-bottom:14px}
.article-head h1{
  font-family:var(--font-display);font-weight:700;
  font-size:clamp(28px, 4vw, 44px);letter-spacing:-0.01em;line-height:1.2;
  margin-bottom:14px;color:var(--ink);
}
.article-head .ameta{margin-top:6px}
.article-body{
  max-width:42em;margin:36px auto 0;
  font-size:18px;line-height:1.8;color:var(--ink);
}
.article-body p{margin-bottom:1.4em}
.article-body h2{font-family:var(--font-display);font-size:26px;font-weight:700;margin:1.8em 0 .6em;line-height:1.3}
.article-body h3{font-family:var(--font-display);font-size:20px;font-weight:700;margin:1.6em 0 .5em;line-height:1.3}
.article-body blockquote{
  border-left:4px solid var(--border);padding:4px 0 4px 16px;
  color:var(--muted);font-style:normal;margin:1.6em 0;
}
.article-body ul,.article-body ol{padding-left:1.4em;margin-bottom:1.4em}
.article-body li{margin-bottom:.5em}
.article-body code{font-family:var(--font-mono);font-size:.92em;background:var(--surface);padding:1px 5px}
.article-back{display:inline-flex;align-items:center;gap:6px;margin-bottom:24px;font-size:14px;color:var(--link);text-decoration:underline;text-underline-offset:3px}
.article-back .arr{transition:transform .2s ease}
.article-back:hover .arr{transform:translateX(-3px)}

/* ============ 页脚：GOV.UK 灰底 ============ */
footer{border-top:2px solid var(--ink);background:var(--surface)}
.foot-grid{
  display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:40px;
  padding:64px 0 48px;
}
.foot-brand .zi{display:flex;align-items:center;gap:10px;font-family:var(--font-display);font-size:24px;font-weight:700;color:var(--ink)}
.foot-brand p{font-size:14px;color:var(--muted);margin-top:12px;max-width:22em;line-height:1.7}
.foot-col h4{
  font-family:var(--font-body);font-size:14px;font-weight:700;
  color:var(--ink);letter-spacing:0;text-transform:none;
  margin-bottom:16px;
}
.foot-col li{margin-bottom:10px}
.foot-col a{font-size:14px;color:var(--link);text-decoration:underline;text-underline-offset:2px}
.foot-col a:hover{color:var(--link-hover);text-decoration-thickness:3px}
.foot-bottom{
  border-top:1px solid var(--border);
  padding:18px 0 22px;
  display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap;
  font-family:var(--font-mono);font-size:11px;letter-spacing:0.04em;color:var(--muted);
}

/* ============ 响应式 ============ */
@media (max-width:1024px){
  .vert-note{display:none}
  .skill-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .foot-grid{grid-template-columns:1fr 1fr;gap:36px}
}
@media (max-width:860px){
  .opening .wrap{grid-template-columns:1fr;gap:44px}
  .articles-grid{grid-template-columns:1fr;gap:36px}
  .practice .wrap{grid-template-columns:1fr;gap:36px}
  .nav-links,.nav-search{display:none}
  .nav-toggle{display:inline-flex;margin-left:auto}
  .nav-cta{margin-left:0}
  .site-nav.open .nav-links{
    display:flex;flex-direction:column;position:absolute;
    left:0;right:0;top:64px;background:var(--govuk-black);
    border-bottom:10px solid var(--link);padding:12px 28px 20px;gap:2px;
  }
  .toc-row{grid-template-columns:56px minmax(0,1fr) 32px;gap:16px}
  .toc-meta{display:none}
  .toc-row .no{font-size:26px}
}
@media (max-width:600px){
  .wrap{padding:0 20px}
  .skill-grid{grid-template-columns:1fr}
  .stats{flex-direction:column;gap:14px}
  .stats li + li{border-left:none;padding-left:0;border-top:1px solid var(--border);padding-top:14px}
  .foot-grid{grid-template-columns:1fr}
}