/* 字段开挂官网 · 共用样式（与案例预览稿同一套设计令牌） */
:root {
  --paper: #f7f8f6; --card: #ffffff; --ink: #17293b; --ink-soft: #48586a;
  --ink-faint: #8595a6; --brand: #123a5c; --accent: #2e7cc4; --accent-soft: #e3eef8;
  --gain: #2e7d5b; --line: #dde3e9;
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #0c1826; --card: #12233a; --ink: #e8eef4; --ink-soft: #a9bacb;
    --ink-faint: #6d8093; --brand: #9cc4e8; --accent: #5da3e0; --accent-soft: #17324e;
    --gain: #5cbd93; --line: #24405e;
  }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0; background: var(--paper); color: var(--ink);
  font-family: "PingFang SC", "Hiragino Sans GB", "Source Han Sans SC", "Microsoft YaHei", system-ui, sans-serif;
  line-height: 1.85; font-size: 16px;
}
a { color: var(--accent); }
.topbar {
  position: sticky; top: 0; z-index: 10; background: var(--card);
  border-bottom: 1px solid var(--line); display: flex; align-items: center;
  gap: 1.5rem; padding: .7rem 1.4rem; flex-wrap: wrap;
}
.logo { font-weight: 700; letter-spacing: .05em; color: var(--brand); font-size: 1.05rem; text-decoration: none; }
.logo small { display: block; font-weight: 400; font-size: .68rem; color: var(--ink-faint); letter-spacing: .18em; }
.topbar nav { display: flex; gap: 1.1rem; font-size: .88rem; flex-wrap: wrap; }
.topbar nav a { color: var(--ink-soft); text-decoration: none; padding: .2rem 0; border-bottom: 2px solid transparent; }
.topbar nav a:hover, .topbar nav a:focus-visible { color: var(--accent); border-bottom-color: var(--accent); outline: none; }
main { max-width: 46rem; margin: 0 auto; padding: 0 1.3rem 4rem; }
.wide { max-width: 60rem; }
section { padding-top: 3rem; }
.eyebrow { font-size: .75rem; letter-spacing: .22em; color: var(--accent); font-weight: 600; margin-bottom: .6rem; }
h1 { font-size: clamp(1.5rem, 3.5vw, 2.2rem); line-height: 1.4; margin: 0 0 .4rem; text-wrap: balance; color: var(--brand); font-weight: 700; }
h2 { font-size: 1.22rem; color: var(--brand); margin: 2.4rem 0 .9rem; line-height: 1.5; text-wrap: balance; font-weight: 700; }
.subtitle { color: var(--ink-soft); font-size: .95rem; margin-bottom: 2rem; }
p { margin: 0 0 1.05rem; max-width: 65ch; }
strong { color: var(--brand); }
ul { padding-left: 1.3rem; margin: 0 0 1.05rem; }
li { margin-bottom: .45rem; max-width: 62ch; }

/* 数据横幅 */
.stats { background: var(--brand); border-radius: 4px; padding: 1.6rem 1.6rem 1.2rem; margin: 0 0 2.4rem; }
@media (prefers-color-scheme: dark) { .stats { background: var(--accent-soft); } }
.stats .headline { font-size: clamp(1.15rem, 2.6vw, 1.5rem); font-weight: 700; line-height: 1.5; margin-bottom: 1.2rem; text-wrap: balance; color: #fff; }
@media (prefers-color-scheme: dark) { .stats .headline { color: var(--ink); } }
.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(12.5rem, 1fr)); gap: .9rem 1.6rem; }
.stat { border-top: 1px solid rgba(255,255,255,.25); padding-top: .55rem; color: #fff; }
@media (prefers-color-scheme: dark) { .stat { border-top-color: var(--line); color: var(--ink); } }
.stat .pair { font-variant-numeric: tabular-nums; font-weight: 700; font-size: 1.06rem; line-height: 1.45; }
.stat .pair .to { color: #ffd98a; }
@media (prefers-color-scheme: dark) { .stat .pair .to { color: #f0c568; } }
.stat .label { font-size: .78rem; opacity: .78; letter-spacing: .04em; }

/* 拉出块 / 引文 */
.pull { border-left: 3px solid var(--accent); background: var(--accent-soft); padding: .9rem 1.2rem; margin: 1.6rem 0; font-weight: 600; color: var(--brand); border-radius: 0 4px 4px 0; max-width: 62ch; }
.think { margin: 3rem 0 0; padding: 1.5rem 1.6rem; background: var(--card); border: 1px solid var(--line); border-radius: 4px; }
.think .tag { font-size: .74rem; letter-spacing: .2em; color: var(--accent); font-weight: 600; margin-bottom: .8rem; }
.think blockquote { margin: 0 0 .9rem; padding: 0; color: var(--ink-soft); }
.think blockquote p { border-left: 2px solid var(--line); padding-left: 1rem; }
.think .more { font-size: .85rem; color: var(--ink-faint); }
.think .more b { color: var(--accent); font-weight: 600; }

/* 卡片网格（案例卡/服务卡） */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr)); gap: 1rem; margin: 1.4rem 0; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 4px; padding: 1.2rem 1.3rem; display: flex; flex-direction: column; gap: .4rem; }
.card .num { font-size: 1.25rem; font-weight: 700; color: var(--brand); font-variant-numeric: tabular-nums; line-height: 1.4; }
.card .name { font-size: .95rem; font-weight: 600; }
.card .desc { font-size: .85rem; color: var(--ink-soft); flex: 1; }
.card a.more-link { font-size: .85rem; text-decoration: none; font-weight: 600; }
.card a.more-link:hover { text-decoration: underline; }

/* CTA */
.cta { display: inline-block; background: var(--accent); color: #fff; text-decoration: none; font-weight: 600; padding: .55rem 1.4rem; border-radius: 4px; }
.cta:hover { filter: brightness(1.08); }

footer { border-top: 1px solid var(--line); margin-top: 4rem; padding: 2rem 1.3rem; text-align: center; color: var(--ink-faint); font-size: .8rem; }
footer a { color: var(--ink-faint); }
.divider { border: none; border-top: 1px solid var(--line); margin: 3.5rem 0 0; }