:root {
  --ink: #0f172a;
  --ink-soft: #475569;
  --line: #e2e8f0;
  --accent: #d97706;
  --accent-deep: #b45309;
  --paper: #ffffff;
  --paper-soft: #f8fafc;
}
* { box-sizing: border-box; }
html, body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.75;
}
.wrap { max-width: 880px; margin: 0 auto; padding: 0 20px; }
a { color: var(--accent-deep); text-decoration: none; }
a:hover { text-decoration: underline; }

/* header */
.site-header { background: var(--ink); }
.nav-row { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 8px; padding-top: 14px; padding-bottom: 14px; }
.logo { font-size: 1.15rem; font-weight: 700; color: #fff; letter-spacing: 0.02em; }
.logo span { color: #fbbf24; margin-left: 4px; }
.logo:hover { text-decoration: none; }
.site-header nav { display: flex; gap: 18px; flex-wrap: wrap; }
.site-header nav a { color: #cbd5e1; font-size: 0.95rem; }
.site-header nav a:hover { color: #fff; text-decoration: none; }
.site-header nav sup { font-size: 0.6em; }

/* hero */
.hero { background: var(--ink); color: #fff; margin: 0 calc(50% - 50vw); padding: 64px 20px 72px; text-align: center; }
.hero-kicker { display: inline-block; border: 1px solid #475569; color: #fbbf24; border-radius: 999px; padding: 3px 14px; font-size: 0.82rem; letter-spacing: 0.05em; margin-bottom: 18px; }
.footer-note { font-size: 0.78rem; color: #94a3b8; margin-top: 6px; }
.hero h1 { font-size: clamp(1.9rem, 5.5vw, 3.2rem); margin: 0 0 14px; letter-spacing: 0.03em; }
.hero p { color: #cbd5e1; font-size: clamp(1rem, 2.5vw, 1.2rem); margin: 0 auto 30px; max-width: 560px; }
.hero .btns { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.btn { display: inline-block; padding: 11px 26px; border-radius: 10px; font-weight: 600; }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-deep); text-decoration: none; }
.btn-ghost { border: 1px solid #475569; color: #e2e8f0; }
.btn-ghost:hover { border-color: #94a3b8; text-decoration: none; }

/* sections & cards */
section { margin: 56px 0; }
.section-title { font-size: 1.5rem; margin: 0 0 6px; }
.section-sub { color: var(--ink-soft); margin: 0 0 24px; }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 18px; }
.card { display: block; border: 1px solid var(--line); border-radius: 14px; padding: 20px 22px; color: var(--ink); background: var(--paper); transition: box-shadow 0.15s, transform 0.15s; }
.card:hover { text-decoration: none; box-shadow: 0 6px 24px rgba(15, 23, 42, 0.08); transform: translateY(-2px); }
.card h3 { margin: 6px 0 8px; font-size: 1.08rem; }
.card p { margin: 0 0 12px; color: var(--ink-soft); font-size: 0.93rem; }
.card-date { color: #94a3b8; font-size: 0.8rem; }
.card-more { color: var(--accent-deep); font-size: 0.9rem; font-weight: 600; }
.card-tag { display: inline-block; background: #fef3c7; color: var(--accent-deep); border-radius: 6px; font-size: 0.78rem; padding: 1px 8px; margin-bottom: 8px; }

/* page head & article */
.page-head { margin: 48px 0 8px; }
.page-head h1 { font-size: 1.9rem; margin: 0 0 8px; }
.page-head p { color: var(--ink-soft); margin: 0; }
.article { max-width: 700px; margin: 48px auto 64px; }
.article h1 { font-size: 1.85rem; line-height: 1.4; margin: 8px 0 24px; }
.article h2 { font-size: 1.35rem; margin: 40px 0 12px; padding-bottom: 6px; border-bottom: 1px solid var(--line); }
.article h3 { font-size: 1.1rem; margin: 28px 0 8px; }
.article p, .article li { font-size: 1.02rem; }
.article blockquote { margin: 20px 0; padding: 10px 18px; border-left: 3px solid var(--accent); background: var(--paper-soft); color: var(--ink-soft); border-radius: 0 8px 8px 0; }
.article blockquote p { margin: 0; }
.article pre { background: var(--ink); color: #e2e8f0; padding: 16px 18px; border-radius: 10px; overflow-x: auto; font-size: 0.88rem; }
.article code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }
.article p code, .article li code { background: var(--paper-soft); border: 1px solid var(--line); border-radius: 5px; padding: 1px 6px; font-size: 0.88em; }
.article hr { border: 0; border-top: 1px solid var(--line); margin: 40px 0 20px; }
.article-foot { color: var(--ink-soft); font-size: 0.93rem; }
.article-nav { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; margin-top: 18px; font-size: 0.9rem; }
.article-nav a { max-width: 47%; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.article-nav .nav-next { margin-left: auto; }

/* misc blocks */
.notice { border: 1px solid #fde68a; background: #fffbeb; border-radius: 12px; padding: 14px 18px; color: #92400e; }
.steps { counter-reset: step; padding-left: 0; list-style: none; }
.steps li { counter-increment: step; margin: 14px 0; padding-left: 44px; position: relative; }
.steps li::before { content: counter(step); position: absolute; left: 0; top: 2px; width: 28px; height: 28px; border-radius: 50%; background: var(--ink); color: #fff; font-weight: 700; font-size: 0.9rem; display: flex; align-items: center; justify-content: center; }

/* footer */
.site-footer { border-top: 1px solid var(--line); margin-top: 72px; padding: 22px 0 34px; color: var(--ink-soft); font-size: 0.88rem; }