* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background:
    linear-gradient(180deg, var(--panel) 0%, var(--bg) 45%, var(--bg-2) 100%) no-repeat,
    var(--bg);
  color: var(--txt);
  font: 16px/1.7 "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, -apple-system, "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
h1, h2, h3, h4 { margin: 0; line-height: 1.25; font-weight: 700; letter-spacing: -.01em; }
p { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== 背景暖光晕 ===== */
.glow {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(760px 460px at 16% -10%, rgba(var(--brand-rgb), .18), transparent 70%),
    radial-gradient(680px 440px at 88% 2%, rgba(var(--brand-2-rgb), .16), transparent 70%),
    radial-gradient(900px 520px at 50% 108%, rgba(var(--brand-3-rgb), .18), transparent 72%);
}

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  border: 0;
  border-radius: 999px;
  background: linear-gradient(120deg, var(--brand), var(--brand-2) 70%, var(--brand-3));
  color: #fff;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 12px 26px -14px rgba(var(--brand-2-rgb), .75);
  transition: transform .25s var(--ease), box-shadow .25s, filter .25s;
}
.btn:hover { transform: translateY(-2px); box-shadow: 0 18px 34px -14px rgba(var(--brand-2-rgb), .6); filter: saturate(1.08); }
.btn-ghost {
  padding: 13px 26px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: rgba(255, 255, 255, .7);
  color: var(--txt);
  font: inherit;
  cursor: pointer;
  transition: border-color .25s, background .25s, transform .25s var(--ease);
}
.btn-ghost:hover { border-color: rgba(var(--brand-rgb), .65); background: #fff; transform: translateY(-2px); }
.btn-sm { padding: 10px 20px; font-size: 14px; }
.btn-block { width: 100%; }

/* ===== 导航 ===== */
.nav {
  position: relative;
  z-index: 50;
  position: sticky;
  top: 0;
  border-bottom: 1px solid transparent;
  transition: background .3s, border-color .3s;
}
.nav.scrolled {
  background: rgba(var(--bg-rgb), .9);
  backdrop-filter: blur(16px);
  border-bottom-color: var(--line);
  box-shadow: var(--shadow-sm);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.logo { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 20px; letter-spacing: -.02em; }
.logo-mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  color: #fff;
  font-size: 17px;
  box-shadow: 0 8px 18px -10px rgba(var(--brand-2-rgb), .7);
}
.logo small { display: block; font-size: 10px; font-weight: 600; letter-spacing: .22em; color: var(--dim); }
@font-face {
  font-family: 'Poppins';
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url('../fonts/poppins-700.woff2') format('woff2');
}
@font-face {
  font-family: 'Poppins';
  font-style: normal;
  font-weight: 800;
  font-display: swap;
  src: url('../fonts/poppins-800.woff2') format('woff2');
}
.logo-img { display: block; height: 18px; width: auto; }
.nav-links { display: flex; align-items: center; gap: 28px; }
.nav-links a:not(.btn) { font-size: 15px; color: var(--dim); transition: color .2s; }
.nav-links a:not(.btn):hover { color: var(--txt); }
.menu-btn {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--panel);
}
.menu-btn span { display: block; width: 18px; height: 1.6px; margin: 4px auto; background: var(--txt); border-radius: 2px; transition: transform .25s, opacity .25s; }
.menu-btn.open span:nth-child(1) { transform: translateY(5.6px) rotate(45deg); }
.menu-btn.open span:nth-child(2) { opacity: 0; }
.menu-btn.open span:nth-child(3) { transform: translateY(-5.6px) rotate(-45deg); }

/* ===== 主视觉 ===== */
.hero { position: relative; z-index: 1; padding: 96px 0 80px; text-align: center; }
.hero .badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 16px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--panel);
  color: var(--dim);
  font-size: 13px;
}
.hero .badge i {
  width: 7px; height: 7px; border-radius: 50%;
  background: linear-gradient(120deg, var(--brand), var(--brand-2)); box-shadow: 0 0 0 4px rgba(var(--brand-rgb), .22);
}
.hero h1 {
  margin: 22px auto 0;
  max-width: 900px;
  font-size: clamp(34px, 5.6vw, 60px);
  font-weight: 800;
  letter-spacing: -.03em;
}
.hero h1 span {
  background: linear-gradient(120deg, var(--pd), var(--accent-2) 55%, var(--p3));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero p.sub {
  margin: 20px auto 0;
  max-width: 640px;
  color: var(--dim);
  font-size: 17px;
}
.hero-cta { display: flex; flex-wrap: wrap; gap: 14px; justify-content: center; margin-top: 34px; }
.hero-note { margin-top: 14px; color: var(--dim); font-size: 13px; }
.plat-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  margin-top: 30px;
}
.plat-row span {
  padding: 7px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--panel);
  color: var(--dim);
  font-size: 13px;
}

.stats {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 56px;
}
.stat {
  padding: 24px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  text-align: center;
}
.stat b { display: block; font-size: 30px; font-weight: 800; letter-spacing: -.02em; color: var(--txt); }
.stat b em { font-style: normal; background: linear-gradient(120deg, var(--accent), var(--accent-2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.stat span { color: var(--dim); font-size: 13.5px; }

/* ===== 区块通用 ===== */
.section { position: relative; z-index: 1; padding: 92px 0; }
.section.alt { background: linear-gradient(180deg, transparent, rgba(var(--line-strong-rgb), .5), transparent); }
.head { text-align: center; margin-bottom: 48px; }
.head .eyebrow {
  display: inline-block;
  margin-bottom: 12px;
  background: linear-gradient(120deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: .2em;
  text-transform: uppercase;
}
.head h2 {
  font-size: clamp(26px, 3.4vw, 38px);
  background: linear-gradient(120deg, var(--pd), var(--accent-2) 45%, var(--p4));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.head p { margin: 14px auto 0; max-width: 620px; color: var(--dim); }

.grid { display: grid; gap: 18px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  padding: 28px 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: var(--shadow-sm);
  transition: transform .3s var(--ease), border-color .3s, background .3s, box-shadow .3s;
}
.card:hover { transform: translateY(-5px); border-color: rgba(var(--brand-rgb), .55); background: var(--panel); box-shadow: var(--shadow); }
.card .ico {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  margin-bottom: 18px;
  border-radius: 13px;
  background: linear-gradient(135deg, rgba(var(--brand-rgb), .22), rgba(var(--brand-2-rgb), .22));
  border: 1px solid rgba(var(--brand-rgb), .28);
}
.card .ico svg { width: 22px; height: 22px; fill: none; stroke: var(--accent); stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
.card h3 { font-size: 18px; }
.card p { margin-top: 10px; color: var(--dim); font-size: 14.5px; }

/* 更快 / 更稳 / 更简单 */
.pillars .card { padding: 32px 28px; }
.pillars .card .tag {
  display: inline-block;
  margin-bottom: 14px;
  padding: 4px 12px;
  border-radius: 999px;
  background: linear-gradient(120deg, rgba(var(--brand-rgb), .16), rgba(var(--brand-2-rgb), .16));
  color: var(--accent);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .12em;
}
.pillars ul { margin-top: 16px; }
.pillars li {
  position: relative;
  padding-left: 20px;
  margin-top: 9px;
  color: var(--dim);
  font-size: 14.5px;
}
.pillars li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 10px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: linear-gradient(120deg, var(--brand), var(--brand-2));
}

/* 场景 */
.scene {
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: var(--shadow-sm);
  transition: border-color .3s, transform .3s var(--ease), box-shadow .3s;
}
.scene:hover { border-color: rgba(var(--brand-rgb), .55); transform: translateY(-4px); box-shadow: var(--shadow); }
.scene b { display: block; font-size: 17px; }
.scene p { margin-top: 8px; color: var(--dim); font-size: 14.5px; }

/* 评价 */
.quote {
  padding: 26px 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
}
.quote p { color: var(--txt); font-size: 15px; }
.quote .who { display: flex; align-items: center; gap: 10px; margin-top: 18px; color: var(--dim); font-size: 13.5px; }
.quote .who i {
  display: grid; place-items: center;
  width: 36px; height: 36px; border-radius: 50%;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  color: #fff; font-style: normal; font-weight: 700;
}

/* FAQ */
.faq { max-width: 820px; margin: 0 auto; }
.faq-item {
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--panel);
  overflow: hidden;
}
.faq-item + .faq-item { margin-top: 12px; }
.faq-q {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 20px;
  border: 0;
  background: none;
  color: var(--txt);
  font: inherit;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
}
.faq-q i {
  flex: none;
  width: 22px; height: 22px;
  border-radius: 50%;
  border: 1px solid var(--line);
  position: relative;
  transition: transform .3s var(--ease), background .3s;
}
.faq-q i::before, .faq-q i::after {
  content: ""; position: absolute; inset: 0; margin: auto;
  background: var(--dim); transition: opacity .3s;
}
.faq-q i::before { width: 10px; height: 1.6px; }
.faq-q i::after { width: 1.6px; height: 10px; }
.faq-item.open .faq-q i { background: linear-gradient(120deg, rgba(var(--brand-rgb), .22), rgba(var(--brand-2-rgb), .22)); transform: rotate(180deg); }
.faq-item.open .faq-q i::after { opacity: 0; }
.faq-a { max-height: 0; overflow: hidden; transition: max-height .4s var(--ease); }
.faq-a div { padding: 0 20px 18px; color: var(--dim); font-size: 14.5px; }

/* CTA */
.cta-band {
  position: relative;
  z-index: 1;
  margin: 0 auto;
  max-width: var(--wrap);
  padding: 52px 32px;
  border: 1px solid rgba(var(--brand-rgb), .28);
  border-radius: 26px;
  background: linear-gradient(135deg, var(--panel-2), var(--bg-2) 60%, var(--panel));
  box-shadow: var(--shadow);
  text-align: center;
}
.cta-band h2 { font-size: clamp(24px, 3vw, 34px); color: var(--pd); }
.cta-band p { margin: 12px auto 26px; max-width: 520px; color: var(--dim); }
.cta-actions { display: flex; flex-wrap: wrap; gap: 14px; justify-content: center; }

/* ===== 页脚 ===== */
.footer { position: relative; z-index: 1; padding: 56px 0 40px; border-top: 1px solid var(--line); }
.footer-inner { display: flex; flex-wrap: wrap; gap: 28px; justify-content: space-between; }
.footer h4 { font-size: 14px; margin-bottom: 12px; }
.footer ul li { margin-top: 8px; }
.footer ul a { color: var(--dim); font-size: 14px; transition: color .2s; }
.footer ul a:hover { color: var(--accent); }
.footer-bottom {
  margin-top: 36px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  color: var(--dim);
  font-size: 13px;
  text-align: center;
}

/* ===== 下载页 ===== */
.page-hero { position: relative; z-index: 1; padding: 72px 0 40px; text-align: center; }
.page-hero h1 { font-size: clamp(28px, 4vw, 42px); }
.page-hero p { margin: 14px auto 0; max-width: 560px; color: var(--dim); }

.detect {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  max-width: 900px;
  margin: 0 auto;
  padding: 16px 22px;
  border: 1px solid rgba(var(--brand-rgb), .38);
  border-radius: 16px;
  background: linear-gradient(120deg, rgba(255, 255, 255, .95), rgba(var(--brand-2-rgb), .07));
  box-shadow: var(--shadow-sm);
  font-size: 14.5px;
}
.detect b { color: var(--accent); }

.dl-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.dl-card {
  display: flex;
  flex-direction: column;
  padding: 26px 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  transition: transform .3s var(--ease), border-color .3s;
}
.dl-card:hover { transform: translateY(-5px); border-color: rgba(var(--brand-rgb), .6); box-shadow: var(--shadow); }
.dl-card.recommend {
  border-color: rgba(var(--brand-rgb), .6);
  background: linear-gradient(160deg, var(--bg), #fff);
  box-shadow: var(--shadow);
}
.dl-card.recommend .dl-badge { color: var(--accent); }
.dl-top { display: flex; align-items: center; gap: 12px; }
.dl-top .ico {
  display: grid; place-items: center;
  width: 42px; height: 42px; border-radius: 12px;
  background: var(--panel-2); border: 1px solid var(--line);
}
.dl-top .ico svg { width: 21px; height: 21px; fill: none; stroke: var(--txt); stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }
.dl-card h3 { font-size: 17px; }
.dl-card .meta { margin-top: 4px; color: var(--dim); font-size: 13px; }
.dl-card dl { display: grid; grid-template-columns: auto 1fr; gap: 6px 14px; margin: 18px 0 22px; font-size: 13.5px; }
.dl-card dt { color: var(--dim); }
.dl-card dd { margin: 0; text-align: right; }
.dl-card .btn { margin-top: auto; }

.table-wrap {
  margin-top: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  overflow: hidden;
}
table { width: 100%; border-collapse: collapse; font-size: 14.5px; }
th, td { padding: 14px 20px; text-align: left; border-bottom: 1px solid var(--line); }
th { color: var(--dim); font-weight: 600; font-size: 13px; letter-spacing: .04em; }
tr:last-child td { border-bottom: 0; }
td.mono { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 13px; color: var(--dim); }
.copy {
  padding: 4px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: none;
  color: var(--dim);
  font: inherit;
  font-size: 12px;
  cursor: pointer;
}
.copy:hover { color: var(--accent); border-color: rgba(var(--brand-rgb), .6); background: var(--panel-2); }

.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; counter-reset: s; }
.step { position: relative; padding: 26px 24px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); }
.step::before {
  counter-increment: s;
  content: "0" counter(s);
  display: block;
  margin-bottom: 12px;
  background: linear-gradient(120deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .12em;
}
.step b { display: block; font-size: 17px; }
.step p { margin-top: 8px; color: var(--dim); font-size: 14.5px; }

.notice {
  max-width: 900px;
  margin: 0 auto;
  padding: 18px 22px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--brand);
  border-radius: 12px;
  background: var(--panel);
  color: var(--dim);
  font-size: 14px;
}

/* ===== 404 ===== */
.err-wrap {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  display: grid;
  place-items: center;
  text-align: center;
  padding: 60px 24px;
}
.err-code {
  font-size: clamp(96px, 22vw, 180px);
  font-weight: 800;
  line-height: .9;
  letter-spacing: -.05em;
  background: linear-gradient(120deg, var(--pd), var(--accent-2) 55%, var(--p3));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.err-wrap h1 { margin-top: 14px; font-size: clamp(22px, 3vw, 30px); }
.err-wrap p { margin: 14px auto 30px; max-width: 460px; color: var(--dim); }
.err-actions { display: flex; flex-wrap: wrap; gap: 14px; justify-content: center; }
.err-links { display: flex; flex-wrap: wrap; gap: 18px; justify-content: center; margin-top: 40px; }
.err-links a { color: var(--dim); font-size: 14px; transition: color .2s; }
.err-links a:hover { color: var(--accent); }

/* ===== GEO 组件（answer-lede / breadcrumb / keyfacts / rating / updbar / toc / prose / checklist）=====
   删除从本行到文件末尾即可整体回滚 */
/* 面包屑（用户可见，与 BreadcrumbList JSON-LD 对应） */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 auto 6px;
  padding: 18px 24px 0;
  max-width: var(--wrap);
  color: var(--dim);
  font-size: 13px;
}
.breadcrumb a { color: var(--dim); transition: color .2s; }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb li { display: flex; align-items: center; gap: 8px; }
.breadcrumb li + li::before { content: "/"; color: var(--line-strong); }
.breadcrumb [aria-current] { color: var(--txt); font-weight: 600; }

/* 答案前置导语（Answer-first lede）：H1 之后 40~80 字直接回答搜索意图 */
.answer-lede {
  max-width: 760px;
  margin: 20px auto 0;
  padding: 16px 20px;
  border: 1px solid rgba(var(--brand-rgb), .38);
  border-left: 4px solid var(--accent);
  border-radius: 14px;
  background: linear-gradient(120deg, rgba(255, 255, 255, .92), rgba(var(--brand-2-rgb), .07));
  color: var(--txt);
  font-size: 15.5px;
  line-height: 1.8;
  text-align: left;
}
.answer-lede b { color: var(--accent); }

/* 关键事实表（可被搜索引擎直接摘录的 key-value 块） */
.keyfacts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
  margin-top: 28px;
  text-align: left;
}
.keyfacts div {
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--panel);
}
.keyfacts dt { color: var(--dim); font-size: 12.5px; letter-spacing: .04em; }
.keyfacts dd { margin: 6px 0 0; font-size: 15px; font-weight: 600; }

/* 综合评分条 */
.rating-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 14px;
  margin-top: 22px;
  color: var(--dim);
  font-size: 14px;
}
.rating-bar .stars { color: #f5a623; letter-spacing: 2px; font-size: 16px; }
.rating-bar b { color: var(--txt); font-size: 16px; }

/* 更新与审阅信息条（E-E-A-T 可见信号） */
.updbar {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px 22px;
  margin-top: 18px;
  color: var(--dim);
  font-size: 12.5px;
}
.updbar span { display: inline-flex; align-items: center; gap: 6px; }
.updbar i {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent); opacity: .7;
}

/* 目录（TOC） */
.toc {
  max-width: 860px;
  margin: 26px auto 0;
  padding: 18px 22px;
  border: 1px dashed var(--line-strong);
  border-radius: 14px;
  background: var(--panel-2);
  text-align: left;
  font-size: 14px;
}
.toc b { display: block; margin-bottom: 10px; font-size: 13.5px; color: var(--dim); letter-spacing: .06em; }
.toc li { margin-top: 6px; }
.toc a { color: var(--txt); }
.toc a:hover { color: var(--accent); }

/* 长文正文（内容页） */
.prose { max-width: 860px; margin: 0 auto; text-align: left; }
.prose h3 { margin-top: 34px; font-size: 20px; }
.prose h3 + p, .prose p { margin-top: 12px; color: var(--dim); font-size: 15.5px; line-height: 1.9; }
.prose ul li { position: relative; padding-left: 20px; margin-top: 8px; color: var(--dim); font-size: 15px; line-height: 1.8; }
.prose ul li::before {
  content: "";
  position: absolute; left: 2px; top: .72em;
  width: 8px; height: 8px; border-radius: 3px;
  background: linear-gradient(120deg, var(--accent), var(--accent-2));
}
.prose strong { color: var(--txt); }

/* 方法说明/口径注释 */
.method-note {
  margin-top: 18px;
  padding: 14px 18px;
  border-left: 3px solid var(--brand-3);
  border-radius: 10px;
  background: var(--panel-2);
  color: var(--dim);
  font-size: 13px;
  line-height: 1.8;
  text-align: left;
}

/* 定义式清单（隐私/条款对照表） */
.dl-cols { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.dl-cols .col-title {
  padding: 12px 18px;
  border-radius: 12px;
  font-size: 15px; font-weight: 700; text-align: center;
}
.dl-cols .yes { background: rgba(52, 211, 153, .12); color: #0f9d6a; }
.dl-cols .no  { background: rgba(var(--brand-2-rgb), .1);  color: #d63b62; }
.dl-cols ul { border: 1px solid var(--line); border-radius: 14px; background: var(--panel); padding: 18px 20px; }
.dl-cols li { margin-top: 10px; color: var(--dim); font-size: 14.5px; line-height: 1.75; padding-left: 18px; position: relative; }
.dl-cols .yes-list li::before { content: "✓"; position: absolute; left: 0; color: #0f9d6a; font-weight: 700; }
.dl-cols .no-list li::before  { content: "✕"; position: absolute; left: 0; color: #d63b62; font-weight: 700; }

@media (max-width: 767px) {
  .dl-cols { grid-template-columns: 1fr; }
  .answer-lede { font-size: 14.5px; }
}

/* hero / page-hero 为居中版式，导语同步居中 */
.hero .answer-lede,
.page-hero .answer-lede { text-align: center; }

/* 行内代码（校验命令等） */
code {
  display: inline-block;
  margin: 6px 0;
  padding: 3px 8px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel-2);
  color: var(--txt);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 13px;
  word-break: break-all;
}

/* ===== 动画 ===== */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity .6s var(--ease), transform .6s var(--ease); }
.reveal.in { opacity: 1; transform: none; }

.toast {
  position: fixed;
  left: 50%;
  bottom: 36px;
  transform: translate(-50%, 16px);
  padding: 12px 22px;
  border: 1px solid rgba(var(--brand-rgb), .35);
  border-radius: 999px;
  background: linear-gradient(120deg, var(--brand), var(--brand-2));
  color: #fff;
  box-shadow: 0 14px 30px -16px rgba(var(--brand-2-rgb), .8);
  backdrop-filter: blur(10px);
  font-size: 14px;
  font-weight: 600;
  opacity: 0;
  pointer-events: none;
  transition: opacity .3s, transform .3s var(--ease);
  z-index: 99;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }

/* ===== 响应式 ===== */
@media (max-width: 980px) {
  .grid-3, .grid-4, .dl-grid, .steps { grid-template-columns: repeat(2, 1fr); }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .nav-links { gap: 16px; }
  .nav-links a:not(.btn) { font-size: 14px; }
  .nav-links .btn { padding: 9px 14px; font-size: 13px; }
}

@media (max-width: 780px) {
  .nav-links {
    position: fixed;
    top: 72px;
    left: 16px;
    right: 16px;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    padding: 18px;
    border: 1px solid var(--line-strong);
    border-radius: 16px;
    background: rgba(var(--panel-rgb), .98);
    backdrop-filter: blur(18px);
    box-shadow: var(--shadow);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity .25s, transform .25s var(--ease), visibility .25s;
  }
  .nav-links.open { opacity: 1; visibility: visible; transform: none; }
  .nav-links a:not(.btn) { padding: 11px 8px; font-size: 16px; }
  .nav-links .btn { margin-top: 8px; }
  .menu-btn { display: block; }
  .section { padding: 72px 0; }
  .grid-3, .grid-4, .grid-2, .dl-grid, .steps { grid-template-columns: 1fr; }
  .hero { padding: 64px 0 56px; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
  .reveal { opacity: 1; transform: none; }
}


/* ============================================================
   皮肤 D · 石墨极简（Graphite Slate）— 冷灰白底 / 靛蓝渐变 / 直角细边
   ============================================================ */
:root {
--bg: #f7f8fa;
--bg-2: #f4f6f9;
--panel: #ffffff;
--panel-2: #f4f6f9;
--line: #e3e8ef;
--line-strong: #cfd7e3;
--txt: #17202e;
--dim: #64748b;
--brand: #334155;
--brand-2: #4f46e5;
--brand-3: #0ea5e9;
--accent: #1f2937;
--accent-2: #4338ca;
--shadow: 0 10px 24px -20px rgba(15,23,42,.45);
--shadow-sm: 0 4px 14px -12px rgba(15,23,42,.35);
--radius: 10px;
--p1: #334155;
--p2: #4f46e5;
--p3: #0ea5e9;
--p4: #4338ca;
--pd: #1f2937;
--bg-rgb: 247,248,250;
--panel-rgb: 255,255,255;
--p1-rgb: 51,65,85;
--p2-rgb: 79,70,229;
--p3-rgb: 14,165,233;
--line-strong-rgb: 207,215,227;
--brand-rgb: 51,65,85;
--brand-2-rgb: 79,70,229;
--brand-3-rgb: 14,165,233;
--wrap: 1160px;
--ease: cubic-bezier(.22, .61, .36, 1);
}
body { background: linear-gradient(180deg,var(--panel) 0%,var(--bg) 45%,var(--bg-2) 100%) no-repeat, var(--bg); }
.glow {
  background:
    radial-gradient(760px 460px at 16% -10%, rgba(var(--p2-rgb),.10), transparent 70%),
    radial-gradient(680px 440px at 88% 2%, rgba(var(--p3-rgb),.10), transparent 70%),
    radial-gradient(900px 520px at 50% 108%, rgba(var(--p1-rgb),.10), transparent 72%);
}
.btn { background: linear-gradient(120deg,var(--p1),var(--p2) 70%,var(--p4)); box-shadow: none; }
.btn:hover { box-shadow: 0 10px 22px -12px rgba(var(--p2-rgb),.55); }
.btn-ghost { background: #fff; }
.btn-ghost:hover { border-color: rgba(var(--p2-rgb),.55); }
.nav.scrolled { background: rgba(var(--bg-rgb),.9); }
.logo-mark { border-radius: 8px; box-shadow: none; }
.hero .badge i { background: linear-gradient(120deg,var(--p1),var(--p2)); box-shadow: none; }
.hero h1 span { background: linear-gradient(120deg,var(--pd),var(--p2) 55%,var(--p3)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.head h2 { background: linear-gradient(120deg,var(--pd),var(--p4) 45%,var(--p1)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.card, .scene, .stat, .quote, .dl-card, .step { box-shadow: none; }
.card .ico { border-radius: 8px; background: linear-gradient(135deg, rgba(var(--p2-rgb),.12), rgba(var(--p3-rgb),.12)); border-color: rgba(var(--p2-rgb),.28); }
.card:hover { border-color: rgba(var(--p2-rgb),.5); background: #fff; transform: translateY(-3px); }
.scene:hover, .dl-card:hover { border-color: rgba(var(--p2-rgb),.5); transform: translateY(-3px); }
.pillars .card .tag { background: rgba(var(--p2-rgb),.10); }
.faq-item.open .faq-q i { background: rgba(var(--p2-rgb),.14); }
.section.alt { background: linear-gradient(180deg, transparent, rgba(var(--line-strong-rgb),.5), transparent); }
.cta-band { border-color: #dbe2ea; background: linear-gradient(135deg,var(--panel-2),var(--bg-2) 60%,var(--panel)); }
.cta-band h2 { color: var(--txt); }
.cta-band p { color: var(--dim); }
.detect { border-color: rgba(var(--p2-rgb),.35); background: linear-gradient(120deg, rgba(255,255,255,.95), rgba(var(--p2-rgb),.07)); }
.dl-card.recommend { border-color: rgba(var(--p2-rgb),.5); background: linear-gradient(160deg,var(--panel-2),#fff); }
.copy:hover { border-color: rgba(var(--p2-rgb),.5); background: var(--panel-2); }
.notice { border-left-color: var(--brand); background: var(--panel-2); }
.err-code { background: linear-gradient(120deg,var(--pd),var(--p2) 55%,var(--p3)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.toast { border-color: rgba(var(--p2-rgb),.35); background: linear-gradient(120deg,var(--pd),var(--p2)); box-shadow: 0 10px 24px -14px rgba(var(--p2-rgb),.7); }
@media (max-width: 780px) { .nav-links { background: rgba(var(--panel-rgb),.98); } }

/* ----- 修复补丁 v1：选中色 / 滚动条 ----- */
::selection { background: rgba(var(--p2-rgb),.2); color: var(--txt); }
html { scrollbar-color: rgba(var(--p2-rgb),.4) var(--bg); }
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(var(--p2-rgb),.32); border: 2px solid transparent; border-radius: 999px; background-clip: content-box; }
::-webkit-scrollbar-thumb:hover { background: rgba(var(--p2-rgb),.52); background-clip: content-box; }
code { padding: 2px 6px; border-radius: 6px; background: rgba(var(--p2-rgb),.10); color: var(--p4); font-size: .92em; }
.stat b, .head .eyebrow, .plat-row span, .hero .badge { font-family: 'Poppins', 'PingFang SC', 'Microsoft YaHei', sans-serif; }
.head .eyebrow, .plat-row span, .hero .badge { font-weight: 700; }


/* ===== hero-focus: title-first hero layout (delete this block to roll back) ===== */
@media (min-width: 861px) {
  .hero { padding: 84px 0 72px; }
}
.hero p.sub { margin-top: 20px; font-size: 16.5px; max-width: none; display: flex; flex-wrap: wrap; align-items: center; justify-content: center; }
.hero p.sub span { white-space: nowrap; }
.hero p.sub span + span::before { content: "|"; margin: 0 16px; color: var(--line-strong); }
@media (max-width: 640px) {
  .hero p.sub { flex-direction: column; gap: 6px; }
  .hero p.sub span + span::before { content: none; }
}
.hero-cta { margin-top: 28px; }
.hero .answer-lede { margin-top: 52px; font-size: 14.5px; padding: 14px 18px; }
.hero .updbar { margin-top: 20px; }
/* ===== end hero-focus ===== */

/* ============================================================
   layout:asym-darkband — 首卡跨列不对称 · 深色分段 · hero 左起
   （删除本段即可回滚版式，不影响上方配色）
   ============================================================ */
:root {
  --wrap: 1264px;
  --radius: 12px;
}
.hero { text-align: left; padding: 104px 0 76px; }
.hero h1 { margin: 20px 0 0; max-width: 880px; }
.hero p.sub { margin: 18px 0 0; max-width: 640px; }
.hero-cta, .plat-row { justify-content: flex-start; }
.hero-note { text-align: left; }
.hero .answer-lede, .page-hero .answer-lede { text-align: left; }
.page-hero { text-align: left; }
.page-hero p { margin-left: 0; }
.section { padding: 98px 0; }
.grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); gap: 20px; }
.grid-3 > :first-child, .grid-4 > :first-child { grid-column: span 2; }
.pillars li { font-size: 15px; }
.section.alt {
  background: linear-gradient(158deg, var(--pd) 0%, var(--p1) 52%, var(--p2) 100%);
  border-top: 0;
  border-bottom: 0;
}
.section.alt .head h2,
.section.alt .head .eyebrow {
  background: none;
  -webkit-text-fill-color: #fff;
  color: #fff;
}
.section.alt .head p { color: rgba(255, 255, 255, .84); }
.section.alt .card,
.section.alt .scene,
.section.alt .quote,
.section.alt .faq-item,
.section.alt .step {
  background: rgba(255, 255, 255, .97);
  border-color: transparent;
}
.section.alt .card:hover,
.section.alt .scene:hover { border-color: var(--brand-2); }
.section.alt .faq-a div { color: var(--dim); }
.cta-band {
  background: linear-gradient(150deg, var(--panel-2) 0%, var(--bg-2) 100%);
  border-radius: 12px;
  padding: 56px 38px;
}
.footer { border-top: 3px solid var(--brand); padding: 66px 0 44px; }
.keyfacts { grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); }
@media (max-width: 980px) {
  .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .grid-3 > :first-child, .grid-4 > :first-child { grid-column: auto; }
  .hero { padding: 76px 0 58px; }
  .section { padding: 76px 0; }
}
@media (max-width: 767px) {
  .section { padding: 58px 0; }
  .hero { padding: 60px 0 44px; }
  .cta-band { padding: 38px 22px; }
}