/* ==========================================================================
   kimik3.io — 设计系统
   静态站,零框架,零外部字体/图片请求。目标:秒开 + 移动端可读 + 像个产品级资料站。
   ========================================================================== */

/* ---------- tokens ---------- */

:root {
  color-scheme: light dark;

  --bg:        #ffffff;
  --bg-sunk:   #f6f8fa;
  --bg-raised: #ffffff;
  --fg:        #14171a;
  --fg-soft:   #4a525d;
  --fg-mute:   #6e7681;
  --line:      #e1e5ea;
  --line-soft: #eef1f4;

  --brand:     #2563eb;
  --brand-fg:  #ffffff;
  --brand-dim: #dbe7fe;

  --danger:    #b42318;
  --danger-bg: #fef3f2;
  --ok:        #067647;
  --ok-bg:     #ecfdf3;
  --warn-bg:   #fffaeb;

  --code-bg:   #f6f8fa;
  --code-fg:   #14171a;

  --radius:    10px;
  --radius-lg: 16px;
  --measure:   68rem;
  --prose:     44rem;

  --shadow: 0 1px 2px rgb(16 24 40 / .04), 0 4px 16px -4px rgb(16 24 40 / .08);

  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg:        #0b0e12;
    --bg-sunk:   #10141a;
    --bg-raised: #141920;
    --fg:        #e8ecf1;
    --fg-soft:   #aab3c0;
    --fg-mute:   #7d8794;
    --line:      #242c37;
    --line-soft: #1a2029;

    --brand:     #5b9bff;
    --brand-fg:  #08111f;
    --brand-dim: #12284a;

    --danger:    #ff7b72;
    --danger-bg: #2a1614;
    --ok:        #56d364;
    --ok-bg:     #0f2418;
    --warn-bg:   #241f10;

    --code-bg:   #0e1319;
    --code-fg:   #e8ecf1;

    --shadow: 0 1px 2px rgb(0 0 0 / .3), 0 8px 24px -6px rgb(0 0 0 / .5);
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.65 var(--sans);
  overflow-wrap: break-word;
  -webkit-font-smoothing: antialiased;
}

.skip { position: absolute; left: -9999px; }
.skip:focus {
  left: 1rem; top: 1rem; z-index: 100;
  background: var(--brand); color: var(--brand-fg);
  padding: .6rem 1rem; border-radius: var(--radius);
}

:focus-visible { outline: 2px solid var(--brand); outline-offset: 2px; border-radius: 3px; }

/* ---------- 布局原语 ---------- */

.wrap { max-width: var(--measure); margin: 0 auto; padding-inline: 1.25rem; }
.prose { max-width: var(--prose); }
.stack > * + * { margin-top: 1rem; }

/* ---------- 导航 ---------- */

.nav {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--line);
}
.nav-in {
  max-width: var(--measure); margin: 0 auto; padding: .75rem 1.25rem;
  display: flex; align-items: center; gap: 1.5rem;
}

.logo {
  display: inline-flex; align-items: center; gap: .5rem;
  font-weight: 700; font-size: 1.02rem; letter-spacing: -.02em;
  color: var(--fg); text-decoration: none; white-space: nowrap;
}
.logo .glyph {
  width: 22px; height: 22px; border-radius: 50%;
  background: radial-gradient(circle at 32% 30%, var(--brand) 0%, var(--brand) 42%, transparent 43%),
              conic-gradient(from 210deg, var(--fg) 0deg, var(--fg-mute) 140deg, var(--fg) 360deg);
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--fg) 20%, transparent);
  flex: none;
}
.logo .tld { color: var(--fg-mute); font-weight: 500; }

.nav-links { display: flex; gap: 1.25rem; font-size: .9rem; flex-wrap: wrap; }
.nav-links a { color: var(--fg-soft); text-decoration: none; white-space: nowrap; }
.nav-links a:hover { color: var(--brand); }
.nav-links a[aria-current="page"] { color: var(--fg); font-weight: 600; }

.nav-cta { margin-left: auto; display: flex; align-items: center; gap: .9rem; }

.lang-switch {
  font-size: .85rem; color: var(--fg-mute); text-decoration: none; white-space: nowrap;
}
.lang-switch:hover { color: var(--brand); }

@media (max-width: 46rem) {
  .nav-in { flex-wrap: wrap; gap: .6rem 1rem; }
  .nav-links { order: 3; width: 100%; gap: 1rem; font-size: .85rem;
               overflow-x: auto; padding-bottom: .15rem; }
  .nav-cta { margin-left: auto; }
}

/* ---------- hero ---------- */

.hero {
  position: relative;
  padding: clamp(2.5rem, 7vw, 4.5rem) 0 clamp(2rem, 5vw, 3rem);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(60rem 22rem at 50% -6rem, var(--brand-dim) 0%, transparent 70%),
    var(--bg);
}

.eyebrow {
  display: inline-flex; align-items: center; gap: .45rem;
  font-size: .78rem; font-weight: 600; letter-spacing: .04em; text-transform: uppercase;
  color: var(--brand);
  background: color-mix(in srgb, var(--brand) 10%, transparent);
  border: 1px solid color-mix(in srgb, var(--brand) 25%, transparent);
  padding: .3rem .65rem; border-radius: 999px;
}
.eyebrow .pip {
  width: 6px; height: 6px; border-radius: 50%; background: var(--ok); flex: none;
}

h1 {
  font-size: clamp(2.1rem, 5.5vw, 3.4rem);
  line-height: 1.08; letter-spacing: -.035em; font-weight: 750;
  margin: 1rem 0 0;
  max-width: 20ch;
}
.hero .lede {
  font-size: clamp(1.02rem, 2.2vw, 1.2rem);
  color: var(--fg-soft);
  max-width: 52ch;
  margin: 1rem 0 0;
}

.hero-actions { display: flex; flex-wrap: wrap; gap: .75rem; margin-top: 1.75rem; }

/* ---------- 事实卡条 ---------- */

.facts {
  display: grid; gap: 1px;
  grid-template-columns: repeat(auto-fit, minmax(9.5rem, 1fr));
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-top: 2.5rem;
}
.fact { background: var(--bg-raised); padding: 1rem 1.1rem; }
.fact dt {
  font-size: .72rem; text-transform: uppercase; letter-spacing: .06em;
  color: var(--fg-mute); font-weight: 600;
}
.fact dd {
  margin: .35rem 0 0; font-size: 1.28rem; font-weight: 700;
  letter-spacing: -.02em; font-family: var(--mono);
}
.fact dd small { font-size: .7rem; font-weight: 500; color: var(--fg-mute); font-family: var(--sans); }

/* ---------- 按钮 ---------- */

.btn {
  display: inline-flex; align-items: center; gap: .5rem;
  font: inherit; font-weight: 600; font-size: .95rem;
  text-decoration: none; cursor: pointer;
  padding: .7rem 1.15rem; border-radius: var(--radius);
  border: 1px solid transparent; line-height: 1.2;
  transition: filter .12s, background .12s;
}
.btn-primary { background: var(--brand); color: var(--brand-fg); box-shadow: var(--shadow); }
.btn-primary:hover { filter: brightness(1.08); }
.btn-primary:active { transform: translateY(1px); }
.btn-ghost { background: transparent; color: var(--fg); border-color: var(--line); }
.btn-ghost:hover { background: var(--bg-sunk); border-color: var(--fg-mute); }
.btn-sm { padding: .45rem .8rem; font-size: .85rem; }

/* ---------- 区块 ---------- */

.band { padding: clamp(3rem, 7vw, 4.5rem) 0; }
.band-sunk { background: var(--bg-sunk); border-block: 1px solid var(--line); }

.band-head { margin-bottom: 2rem; max-width: 56ch; }
.band-head h2 {
  font-size: clamp(1.5rem, 3.2vw, 2rem); letter-spacing: -.025em;
  line-height: 1.2; margin: 0; font-weight: 700;
}
.band-head p { color: var(--fg-soft); margin: .6rem 0 0; }

/* ---------- 卡片网格 ---------- */

.cards { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr)); }

.card {
  display: flex; flex-direction: column;
  background: var(--bg-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 1.35rem;
  text-decoration: none; color: inherit;
  transition: border-color .12s, transform .12s, box-shadow .12s;
}
a.card:hover {
  border-color: var(--brand);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}
.card .kicker {
  font-size: .72rem; font-weight: 700; letter-spacing: .06em; text-transform: uppercase;
  color: var(--fg-mute);
}
.card h3 { font-size: 1.08rem; margin: .5rem 0 .4rem; letter-spacing: -.015em; line-height: 1.3; }
.card p { margin: 0; color: var(--fg-soft); font-size: .92rem; }
.card .metric {
  font-family: var(--mono); font-size: 1.5rem; font-weight: 700;
  letter-spacing: -.03em; margin: .2rem 0 .3rem;
}
.card .more {
  margin-top: auto; padding-top: .9rem;
  font-size: .87rem; font-weight: 600; color: var(--brand);
}
a.card:hover .more::after { transform: translateX(3px); }
.card .more::after {
  content: "→"; display: inline-block; margin-left: .3rem;
  transition: transform .12s;
}

.card-hero {
  border-color: var(--danger);
  background: var(--danger-bg);
}
.card-hero .kicker { color: var(--danger); }

/* ---------- 正文排版 ---------- */

.prose h2 {
  font-size: clamp(1.35rem, 3vw, 1.7rem); letter-spacing: -.022em;
  margin: 2.75rem 0 .75rem; padding-bottom: .4rem;
  border-bottom: 1px solid var(--line); font-weight: 700;
}
.prose h3 { font-size: 1.05rem; margin: 2rem 0 .5rem; font-weight: 650; }
.prose p, .prose ul, .prose ol { margin: .9rem 0; }
.prose > :first-child { margin-top: 0; }
.prose ul, .prose ol { padding-left: 1.3rem; }
.prose li { margin: .4rem 0; }
.prose a:not(.btn) { color: var(--brand); }

.lead { font-size: 1.1rem; color: var(--fg-soft); }

/* ---------- 直答框 ---------- */

.answer {
  background: var(--bg-raised);
  border: 1px solid var(--line);
  border-left: 3px solid var(--brand);
  border-radius: var(--radius);
  padding: 1.1rem 1.25rem;
  box-shadow: var(--shadow);
}
.answer p { margin: 0; font-size: 1.05rem; }
.answer .stamp { margin-top: .65rem; font-size: .8rem; color: var(--fg-mute); }

/* ---------- 表格 ---------- */

.scroller { overflow-x: auto; margin: 1.25rem 0; border-radius: var(--radius); }

table { border-collapse: collapse; width: 100%; min-width: 30rem; font-size: .92rem; }
caption { text-align: left; color: var(--fg-mute); font-size: .82rem; padding-bottom: .6rem; }
th, td { text-align: left; vertical-align: top; padding: .62rem .75rem; border-bottom: 1px solid var(--line); }
thead th {
  font-size: .72rem; text-transform: uppercase; letter-spacing: .06em;
  color: var(--fg-mute); border-bottom: 2px solid var(--line); font-weight: 700;
  white-space: nowrap;
}
tbody th[scope="row"] { font-weight: 600; white-space: nowrap; }
tbody tr:last-child td, tbody tr:last-child th { border-bottom: 0; }

tr.bad  td { background: var(--danger-bg); }
tr.good td { background: var(--ok-bg); }
tr.hi   td { background: var(--warn-bg); }
tr.bad td:first-child, tr.good td:first-child { font-weight: 600; }

.num { font-family: var(--mono); font-variant-numeric: tabular-nums; }

/* ---------- 代码 ---------- */

code {
  font-family: var(--mono); font-size: .875em;
  background: var(--code-bg); color: var(--code-fg);
  border: 1px solid var(--line); border-radius: 4px; padding: .1em .35em;
}

pre {
  background: var(--code-bg); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 1rem; overflow-x: auto; margin: 1rem 0;
}
pre code { background: none; border: 0; padding: 0; font-size: .845rem; line-height: 1.6; }

pre.mini { margin: 0; padding: .5rem .6rem; }
pre.mini code { font-size: .76rem; line-height: 1.45; }

.codeframe { border: 1px solid var(--line); border-radius: var(--radius-lg); overflow: hidden; background: var(--bg-raised); }
.codeframe-bar {
  display: flex; align-items: center; gap: .6rem;
  padding: .5rem .9rem; border-bottom: 1px solid var(--line);
  background: var(--bg-sunk); font-size: .78rem; color: var(--fg-mute);
  font-family: var(--mono);
}
.codeframe-bar .dot { width: 9px; height: 9px; border-radius: 50%; background: var(--line); flex: none; }
.codeframe pre { border: 0; border-radius: 0; margin: 0; background: var(--bg-raised); }

/* ---------- 小字 ---------- */

.note, .src { font-size: .86rem; color: var(--fg-mute); }
.note { border-left: 2px solid var(--line); padding-left: .9rem; }
.flag, .muted { color: var(--fg-mute); font-weight: 400; font-size: .85em; }

.tag {
  display: inline-block; font-size: .7rem; font-weight: 700; letter-spacing: .05em;
  text-transform: uppercase; padding: .18rem .45rem; border-radius: 4px;
  background: var(--brand-dim); color: var(--brand); vertical-align: middle;
}

/* ---------- 方法透明块 ---------- */

.method {
  background: var(--bg-sunk); border: 1px solid var(--line);
  border-radius: var(--radius-lg); padding: 1.4rem;
}
.method h2 { border-bottom: 0; margin: 0 0 .5rem; font-size: 1.15rem; }
.method p { font-size: .9rem; color: var(--fg-soft); }

/* ---------- CTA 区 ---------- */

.cta-band {
  border: 1px solid var(--line); border-radius: var(--radius-lg);
  padding: clamp(1.5rem, 4vw, 2.25rem);
  background:
    radial-gradient(40rem 16rem at 20% -4rem, var(--brand-dim) 0%, transparent 70%),
    var(--bg-raised);
}
.cta-band h2 { margin: 0 0 .5rem; font-size: clamp(1.3rem, 3vw, 1.6rem); letter-spacing: -.02em; }
.cta-band p { margin: 0 0 1.25rem; color: var(--fg-soft); max-width: 48ch; }

/* ---------- 页脚 ---------- */

.foot { border-top: 1px solid var(--line); background: var(--bg-sunk); margin-top: 4rem; }
.foot-in {
  max-width: var(--measure); margin: 0 auto; padding: 2.5rem 1.25rem 2rem;
  display: grid; gap: 2.5rem 2rem; grid-template-columns: 2fr 1fr 1fr 1fr;
}
@media (max-width: 56rem) {
  .foot-in { grid-template-columns: 1fr 1fr; }
  .foot-in > div:first-child { grid-column: 1 / -1; }
}
@media (max-width: 30rem) {
  .foot-in { grid-template-columns: 1fr; }
}
.foot h4 {
  font-size: .74rem; text-transform: uppercase; letter-spacing: .07em;
  color: var(--fg-mute); margin: 0 0 .7rem; font-weight: 700;
}
.foot ul { list-style: none; margin: 0; padding: 0; }
.foot li { margin: .4rem 0; }
.foot a { color: var(--fg-soft); text-decoration: none; font-size: .9rem; }
.foot a:hover { color: var(--brand); }
.foot .blurb { color: var(--fg-mute); font-size: .87rem; margin: .8rem 0 0; max-width: 34ch; }

.foot-base {
  max-width: var(--measure); margin: 0 auto;
  padding: 1.1rem 1.25rem 2.5rem; border-top: 1px solid var(--line);
  display: flex; flex-wrap: wrap; gap: .5rem 1.5rem; justify-content: space-between;
  font-size: .82rem; color: var(--fg-mute);
}
.foot-base p { margin: 0; }
.foot-base .published { font-weight: 600; color: var(--fg-soft); }

/* ---------- 面包屑 ---------- */

.crumbs { font-size: .84rem; color: var(--fg-mute); padding-top: 1.75rem; }
.crumbs a { color: var(--fg-mute); text-decoration: none; }
.crumbs a:hover { color: var(--brand); text-decoration: underline; }
.crumbs span { margin: 0 .4rem; opacity: .5; }

.page-head { padding: 1rem 0 2rem; border-bottom: 1px solid var(--line); margin-bottom: 2.5rem; }
.page-head h1 { font-size: clamp(1.8rem, 4.5vw, 2.6rem); max-width: 24ch; margin: .5rem 0 0; }
.page-head .lede { color: var(--fg-soft); font-size: 1.05rem; margin: .8rem 0 0; max-width: 54ch; }

/* ---------- 页内目录 ---------- */

.toc {
  border: 1px solid var(--line); border-radius: var(--radius);
  padding: 1rem 1.2rem; background: var(--bg-sunk); margin: 0 0 2rem;
}
.toc h4 { font-size: .72rem; text-transform: uppercase; letter-spacing: .07em;
          color: var(--fg-mute); margin: 0 0 .5rem; font-weight: 700; }
.toc ol { margin: 0; padding-left: 1.1rem; font-size: .9rem; }
.toc li { margin: .25rem 0; }
.toc a { color: var(--fg-soft); text-decoration: none; }
.toc a:hover { color: var(--brand); text-decoration: underline; }

/* ---------- 相关页 ---------- */

.next-up { margin-top: 3.5rem; padding-top: 2rem; border-top: 1px solid var(--line); }
.next-up h2 { font-size: 1.15rem; margin: 0 0 1rem; border: 0; padding: 0; }

/* ---- hero 内嵌直答框 ---- */

.hero-answer {
  margin-top: 1.5rem;
  max-width: 58ch;
}
.hero-answer p { font-size: 1.02rem; }

.hero h1 { max-width: 24ch; }

/* ---------- 图表 ---------- */

:root { --chart-1: #2563eb; }
@media (prefers-color-scheme: dark) { :root { --chart-1: #4d84e8; } }

.fig {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--bg-raised);
  padding: 1.25rem 1.25rem 1rem;
  margin: 1.5rem 0;
}
.fig figcaption {
  font-size: .82rem; color: var(--fg-mute); margin-top: .8rem;
}
.fig svg { display: block; width: 100%; height: auto; }
.fig .chart-title {
  font-size: .95rem; font-weight: 650; margin: 0 0 .15rem; color: var(--fg);
}
.fig .chart-sub { font-size: .82rem; color: var(--fg-mute); margin: 0 0 1rem; }

.legend { display: flex; flex-wrap: wrap; gap: .4rem 1.1rem; margin: .75rem 0 0; font-size: .8rem; color: var(--fg-soft); }
.legend span { display: inline-flex; align-items: center; gap: .4rem; }
.legend i { width: 10px; height: 10px; border-radius: 3px; flex: none; }

/* ---------- hero 双栏 ---------- */

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
  gap: clamp(1.5rem, 4vw, 3.5rem);
  align-items: center;
}
.hero-grid .codeframe { box-shadow: var(--shadow); }
.hero-grid pre code { font-size: .78rem; }
@media (max-width: 56rem) {
  .hero-grid { grid-template-columns: minmax(0, 1fr); }
}
.hero .facts { margin-top: 2rem; }

/* ---------- 计算器 ---------- */

.calc { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr); gap: 1.5rem; align-items: start; }
@media (max-width: 56rem) { .calc { grid-template-columns: minmax(0, 1fr); } }

.calc-panel {
  border: 1px solid var(--line); border-radius: var(--radius-lg);
  background: var(--bg-raised); padding: 1.4rem;
}
.calc-panel h3 { margin: 0 0 1rem; font-size: .95rem; }

.field { margin: 0 0 1.1rem; }
.field label { display: flex; justify-content: space-between; font-size: .85rem; font-weight: 600; margin-bottom: .35rem; }
.field label output { font-family: var(--mono); font-weight: 700; color: var(--brand); }
.field input[type="number"] {
  width: 100%; font: inherit; font-family: var(--mono);
  padding: .5rem .65rem; border-radius: var(--radius);
  border: 1px solid var(--line); background: var(--bg); color: var(--fg);
}
.field input[type="range"] { width: 100%; accent-color: var(--brand); }
.field .hint { font-size: .76rem; color: var(--fg-mute); margin-top: .3rem; }

.calc-out .big {
  font-family: var(--mono); font-size: clamp(2rem, 5vw, 2.8rem);
  font-weight: 750; letter-spacing: -.03em; line-height: 1.1;
}
.calc-out .big small { font-size: .45em; color: var(--fg-mute); font-weight: 500; }
.calc-rows { margin: 1.25rem 0 0; font-size: .9rem; }
.calc-rows .row { display: flex; justify-content: space-between; gap: 1rem; padding: .5rem 0; border-bottom: 1px solid var(--line-soft); }
.calc-rows .row:last-child { border-bottom: 0; font-weight: 700; }
.calc-rows .num { font-family: var(--mono); white-space: nowrap; }
.calc-rows .save { color: var(--ok); }

/* ---------- hero 减重 ---------- */

.hero-grid { align-items: center; }
.hero-grid .codeframe pre code { font-size: .76rem; line-height: 1.55; }
.hero-grid .codeframe code i { font-style: normal; color: var(--fg-mute); }

/* 事实条:去盒子,纯排版 */
.facts {
  display: flex; flex-wrap: wrap; gap: 1.25rem 3rem;
  background: none; border: 0; border-top: 1px solid var(--line);
  border-radius: 0; overflow: visible;
  margin-top: 2.75rem; padding-top: 1.5rem;
}
.fact { background: none; padding: 0; }
.fact dd { font-size: 1.15rem; margin-top: .2rem; }

/* 直答框带:紧贴 hero,略收 */
.answer-band { padding: 2.25rem 0 1rem; }

/* 正向高亮卡(替代首页上的 danger 卡) */
.card-win { border-color: var(--ok); background: var(--ok-bg); }
.card-win .kicker { color: var(--ok); }


/* ---------- CJK 排版(仅作用于 zh 页面) ---------- */

:lang(zh-CN) h1, :lang(zh-CN) h2, :lang(zh-CN) h3,
:lang(zh-CN) .card h3, :lang(zh-CN) .band-head h2 {
  letter-spacing: 0;            /* 负字距是给拉丁字母的,汉字会挤 */
}
:lang(zh-CN) p, :lang(zh-CN) li {
  line-break: strict;           /* 禁止行首出现「——、,。」等 */
  line-height: 1.8;
}
:lang(zh-CN) .prose p, :lang(zh-CN) .answer p,
:lang(zh-CN) .card p, :lang(zh-CN) .band-head p {
  text-align: justify;          /* CJK 段落两端对齐,右缘整齐 */
}
:lang(zh-CN) .lede { text-align: left; }  /* 短导语保持左对齐,避免大空隙 */


/* ---------- 首页 band 居中节奏(hero 以下的区块统一居中,消灭右侧真空) ---------- */

.answer-band { padding: 3rem 0 2.5rem; }
.answer-band .answer {
  max-width: 56rem;
  margin-inline: auto;
  padding: 1.5rem 1.9rem;
}
.answer-band .answer p { font-size: 1.1rem; line-height: 1.75; }

.band-head {
  margin-inline: auto;
  text-align: center;
}
.band-head p { margin-inline: auto; }

/* 居中节奏下,卡片内部保持左对齐 */
.card { text-align: left; }

/* 首页正文里的独立代码框与说明:限宽居中 */
.band .wrap > .codeframe { max-width: 56rem; margin-inline: auto; }
.band .wrap > .note { max-width: 56rem; margin-inline: auto; }

/* CTA 收尾横幅:内容居中 */
.cta-band { text-align: center; }
.cta-band p { margin-inline: auto; }