:root {
  --ink: #14161a;
  --ink-2: #3f4650;
  --muted: #6b7280;
  --line: #e6e8ec;
  --bg: #ffffff;
  --bg-soft: #f7f8fa;
  --card: #ffffff;
  --accent: #d9480f;
  --accent-soft: #fff3ec;
  --accent-ink: #a63c0c;
  --ok: #0f766e;
  --radius: 14px;
  --radius-sm: 9px;
  --shadow: 0 1px 2px rgba(16,24,40,.06), 0 8px 24px -12px rgba(16,24,40,.18);
  --wrap: 1120px;
  --prose: 46rem;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB",
          "Microsoft YaHei", "Source Han Sans SC", system-ui, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}
@media (prefers-color-scheme: dark) {
  :root {
    --ink: #e9ecf1; --ink-2: #c2c8d2; --muted: #98a1af;
    --line: #262b34; --bg: #0f1116; --bg-soft: #161922; --card: #141822;
    --accent: #ff8757; --accent-soft: #241713; --accent-ink: #ffb08c;
    --shadow: 0 1px 2px rgba(0,0,0,.4), 0 12px 30px -14px rgba(0,0,0,.7);
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font-family: var(--font); font-size: 16.5px; line-height: 1.78;
  text-rendering: optimizeLegibility; -webkit-font-smoothing: antialiased;
}
a { color: var(--accent-ink); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
img { max-width: 100%; height: auto; }
hr { border: 0; border-top: 1px solid var(--line); margin: 2.5em 0; }

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 20px; }
.skip { position: absolute; left: -9999px; }
.skip:focus { left: 12px; top: 12px; background: var(--accent); color: #fff; padding: 8px 14px; border-radius: 8px; z-index: 99; }

/* ---------- header ---------- */
.site-header { position: sticky; top: 0; z-index: 30; background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: saturate(180%) blur(12px); border-bottom: 1px solid var(--line); }
.hdr { display: flex; align-items: center; gap: 18px; height: 62px; min-width: 0; }
.brand { display: flex; align-items: center; gap: 9px; font-weight: 800; font-size: 1.06rem; color: var(--ink); letter-spacing: -.01em; flex: none; }
.brand:hover { text-decoration: none; }
.logo { width: 30px; height: 30px; border-radius: 9px; background: linear-gradient(135deg, var(--accent), #f59e0b); color: #fff; display: grid; place-items: center; font-size: 15px; font-weight: 900; }
.nav { display: flex; align-items: center; gap: 4px; margin-left: auto; overflow-x: auto; scrollbar-width: none; min-width: 0; flex: 0 1 auto; }
.nav::-webkit-scrollbar { display: none; }
.nav a { color: var(--ink-2); padding: 7px 10px; border-radius: 8px; font-size: .94rem; white-space: nowrap; }
.nav a:hover { background: var(--bg-soft); text-decoration: none; }
.nav a.active { color: var(--accent-ink); background: var(--accent-soft); }
.nav .cta { background: var(--ink); color: var(--bg); padding: 8px 14px; font-weight: 600; }
.nav .cta:hover { background: var(--accent); color: #fff; }
.nav-search { border: 1px solid var(--line); background: var(--card); color: var(--muted); width: 32px; height: 32px; border-radius: 8px; display: grid; place-items: center; cursor: pointer; padding: 0; }
.nav-search:hover { color: var(--accent-ink); border-color: var(--accent); }

/* ---------- hero ---------- */
.hero { padding: 64px 0 40px; border-bottom: 1px solid var(--line); background:
  radial-gradient(900px 320px at 12% -10%, var(--accent-soft), transparent 70%); }
.hero h1 { font-size: clamp(1.9rem, 4.6vw, 3.05rem); line-height: 1.18; letter-spacing: -.025em; margin: 0 0 14px; font-weight: 850; }
.hero p.lead { font-size: 1.08rem; color: var(--ink-2); max-width: 40rem; margin: 0 0 22px; }
.eyebrow { display: inline-flex; align-items: center; gap: 8px; font-size: .8rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--accent-ink); background: var(--accent-soft); border: 1px solid color-mix(in srgb, var(--accent) 24%, transparent); padding: 5px 11px; border-radius: 999px; margin-bottom: 18px; }
.btn-row { display: flex; flex-wrap: wrap; gap: 10px; }
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 11px 18px; border-radius: 10px; font-weight: 650; font-size: .96rem; border: 1px solid var(--line); color: var(--ink); background: var(--card); }
.btn:hover { text-decoration: none; border-color: var(--ink); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.primary:hover { filter: brightness(1.06); }
.hero-stats { display: flex; flex-wrap: wrap; gap: 26px; margin-top: 30px; color: var(--muted); font-size: .9rem; }
.hero-stats b { display: block; color: var(--ink); font-size: 1.25rem; }

/* ---------- sections ---------- */
.section { padding: 46px 0; }
.section + .section { border-top: 1px solid var(--line); }
.sec-head { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; margin-bottom: 22px; }
.sec-head h2 { font-size: 1.35rem; margin: 0; letter-spacing: -.015em; }
.sec-head a { font-size: .9rem; color: var(--muted); }

/* ---------- cards ---------- */
.grid { display: grid; gap: 18px; }
.grid.cols-2 { grid-template-columns: repeat(2, minmax(0,1fr)); }
.grid.cols-3 { grid-template-columns: repeat(3, minmax(0,1fr)); }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; display: flex; flex-direction: column; gap: 10px; transition: transform .16s ease, box-shadow .16s ease, border-color .16s ease; }
.card:hover { transform: translateY(-2px); box-shadow: var(--shadow); border-color: color-mix(in srgb, var(--accent) 30%, var(--line)); }
.card h3 { margin: 0; font-size: 1.06rem; line-height: 1.44; letter-spacing: -.01em; }
.card h3 a { color: var(--ink); }
.card p { margin: 0; color: var(--ink-2); font-size: .92rem; line-height: 1.62; }
.card .meta { margin-top: auto; font-size: .8rem; color: var(--muted); display: flex; gap: 10px; flex-wrap: wrap; }
.pill { display: inline-block; align-self: flex-start; font-size: .76rem; font-weight: 650; color: var(--accent-ink); background: var(--accent-soft); padding: 3px 9px; border-radius: 999px; }
.card .thumb { aspect-ratio: 16/9; border-radius: var(--radius-sm); background: var(--bg-soft) center/cover no-repeat; border: 1px solid var(--line); margin: -6px -6px 4px; }

/* ---------- article ---------- */
.article-head { padding: 44px 0 28px; border-bottom: 1px solid var(--line); }
.crumbs { font-size: .82rem; color: var(--muted); margin-bottom: 14px; display: flex; gap: 7px; flex-wrap: wrap; }
.crumbs a { color: var(--muted); }
.article-head h1 { font-size: clamp(1.6rem, 3.6vw, 2.35rem); line-height: 1.28; letter-spacing: -.02em; margin: 0 0 12px; font-weight: 820; }
.article-head .dek { color: var(--ink-2); font-size: 1.03rem; margin: 0 0 16px; max-width: 44rem; }
.byline { display: flex; flex-wrap: wrap; gap: 8px 16px; font-size: .85rem; color: var(--muted); }
.layout-article { display: grid; grid-template-columns: minmax(0,1fr) 250px; gap: 46px; padding: 40px 0 60px; }
@media (max-width: 980px) { .layout-article { grid-template-columns: minmax(0,1fr); gap: 26px; } .toc-box { display: none; } }
.prose { max-width: var(--prose); font-size: 1.03rem; overflow-wrap: anywhere; }
.prose h2 { font-size: 1.42rem; margin: 2.2em 0 .6em; letter-spacing: -.015em; scroll-margin-top: 80px; }
.prose h3 { font-size: 1.14rem; margin: 1.8em 0 .5em; scroll-margin-top: 80px; }
.prose h4 { font-size: 1rem; margin: 1.5em 0 .4em; }
.prose p { margin: 1em 0; }
.prose ul, .prose ol { padding-left: 1.35em; margin: 1em 0; }
.prose li { margin: .4em 0; }
.prose li.task { list-style: none; margin-left: -1.1em; }
.prose .anchor { opacity: 0; margin-left: 8px; color: var(--muted); font-weight: 400; text-decoration: none; }
.prose h2:hover .anchor, .prose h3:hover .anchor { opacity: 1; }
.prose blockquote { margin: 1.5em 0; padding: 2px 0 2px 18px; border-left: 3px solid var(--accent); color: var(--ink-2); background: linear-gradient(90deg, var(--accent-soft), transparent 70%); border-radius: 0 8px 8px 0; }
.prose code { font-family: var(--mono); font-size: .88em; background: var(--bg-soft); border: 1px solid var(--line); padding: 1px 5px; border-radius: 5px; }
.codeblock { position: relative; margin: 1.4em 0; }
.codeblock pre { background: #14161f; color: #e6e9ef; padding: 16px 18px; border-radius: 12px; overflow-x: auto; font-size: .86rem; line-height: 1.62; }
.codeblock pre code { background: none; border: 0; padding: 0; color: inherit; }
.codeblock[data-lang]::before { content: attr(data-lang); position: absolute; top: 8px; right: 12px; font-size: .68rem; color: #8b93a5; letter-spacing: .06em; text-transform: uppercase; }
.table-wrap { overflow-x: auto; margin: 1.5em 0; border: 1px solid var(--line); border-radius: var(--radius-sm); }
table { border-collapse: collapse; width: 100%; min-width: 460px; font-size: .92rem; }
th, td { padding: 10px 13px; text-align: left; border-bottom: 1px solid var(--line); vertical-align: top; }
th { background: var(--bg-soft); font-weight: 700; white-space: nowrap; }
tr:last-child td { border-bottom: 0; }
.prose img { border-radius: var(--radius-sm); border: 1px solid var(--line); }

.callout { border-radius: var(--radius-sm); padding: 14px 18px; margin: 1.5em 0; font-size: .95rem; border: 1px solid var(--line); background: var(--bg-soft); }
.callout p:first-child { margin-top: 0; } .callout p:last-child { margin-bottom: 0; }
.callout.note { border-left: 3px solid var(--ok); }
.callout.tip { border-left: 3px solid #2563eb; }
.callout.warn { border-left: 3px solid #dc2626; background: color-mix(in srgb, #dc2626 5%, var(--bg)); }

.product { display: grid; gap: 12px; border: 1px solid var(--line); border-radius: var(--radius); padding: 16px 18px; margin: 1.6em 0; background: var(--card); }
.product .p-top { display: flex; gap: 14px; align-items: flex-start; }
.product .p-name { font-weight: 700; }
.product .p-why { color: var(--ink-2); font-size: .92rem; margin: 4px 0 0; }
.product .p-price { font-size: .84rem; color: var(--muted); }
.product a.buy { justify-self: start; align-self: flex-start; background: var(--accent); color: #fff; padding: 8px 15px; border-radius: 8px; font-size: .88rem; font-weight: 650; }
.product a.buy:hover { text-decoration: none; filter: brightness(1.06); }
.disclosure { font-size: .78rem; color: var(--muted); border-top: 1px dashed var(--line); padding-top: 8px; }

.toc-box { position: sticky; top: 84px; align-self: start; font-size: .86rem; }
.toc-box h4 { margin: 0 0 10px; font-size: .78rem; letter-spacing: .1em; text-transform: uppercase; color: var(--muted); }
.toc-box ol { list-style: none; padding: 0; margin: 0; border-left: 1px solid var(--line); }
.toc-box li { margin: 0; }
.toc-box a { display: block; padding: 5px 0 5px 12px; color: var(--ink-2); border-left: 2px solid transparent; margin-left: -1px; line-height: 1.5; }
.toc-box a:hover, .toc-box a.on { color: var(--accent-ink); border-left-color: var(--accent); text-decoration: none; }

.related { border-top: 1px solid var(--line); margin-top: 3em; padding-top: 1.6em; }
.related h2 { font-size: 1.1rem; margin: 0 0 14px; }
.related ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.related a { font-weight: 600; }

.faq { margin-top: 2.4em; }
.faq details { border: 1px solid var(--line); border-radius: var(--radius-sm); padding: 12px 16px; margin-bottom: 10px; background: var(--card); }
.faq summary { cursor: pointer; font-weight: 650; }
.faq details[open] summary { margin-bottom: 8px; }
.faq p { margin: .4em 0; color: var(--ink-2); font-size: .95rem; }

/* ---------- CTA / ads / newsletter ---------- */
.band { background: var(--bg-soft); border: 1px solid var(--line); border-radius: var(--radius); padding: 26px; display: grid; gap: 12px; }
.band h2 { margin: 0; font-size: 1.2rem; }
.band p { margin: 0; color: var(--ink-2); font-size: .95rem; }
.slot-ad { border: 1px dashed var(--line); border-radius: var(--radius-sm); padding: 18px; text-align: center; color: var(--muted); font-size: .82rem; background: var(--bg-soft); }
.subscribe { display: flex; gap: 10px; flex-wrap: wrap; }
.subscribe input { flex: 1 1 220px; padding: 10px 13px; border: 1px solid var(--line); border-radius: 9px; background: var(--bg); color: var(--ink); font: inherit; font-size: .94rem; }
.subscribe button { padding: 10px 18px; border: 0; border-radius: 9px; background: var(--accent); color: #fff; font: inherit; font-weight: 650; cursor: pointer; }
.fineprint { font-size: .78rem; color: var(--muted); }

/* ---------- lists ---------- */
.post-list { list-style: none; padding: 0; margin: 0; }
.post-list li { display: grid; grid-template-columns: 104px minmax(0,1fr); gap: 18px; padding: 20px 0; border-bottom: 1px solid var(--line); }
.post-list time { color: var(--muted); font-size: .84rem; padding-top: 3px; }
.post-list h3 { margin: 0 0 4px; font-size: 1.04rem; }
.post-list h3 a { color: var(--ink); }
.post-list p { margin: 0; color: var(--ink-2); font-size: .9rem; }
@media (max-width: 620px) { .post-list li { grid-template-columns: 1fr; gap: 4px; } .grid.cols-2, .grid.cols-3 { grid-template-columns: 1fr; } .hero { padding: 42px 0 32px; } }
@media (max-width: 860px) {
  .hdr { gap: 10px; }
  .nav { margin-left: 0; flex: 1 1 auto; }
  .nav a { font-size: .88rem; padding: 7px 8px; }
  .nav .cta { padding: 7px 11px; }
  .hero h1 br { display: none; }
}
@media (max-width: 520px) {
  .brand span:last-child { display: none; }
  .nav .cta, .nav a.secondary { display: none; }
  .hero-stats { gap: 18px; }
  .section { padding: 34px 0; }
}
.tags { display: flex; flex-wrap: wrap; gap: 8px; margin: 18px 0; }
.tags a { font-size: .82rem; padding: 4px 10px; border: 1px solid var(--line); border-radius: 999px; color: var(--ink-2); }
.tags a:hover { border-color: var(--accent); color: var(--accent-ink); text-decoration: none; }

/* ---------- footer ---------- */
.site-footer { border-top: 1px solid var(--line); background: var(--bg-soft); padding: 38px 0 30px; margin-top: 20px; font-size: .88rem; color: var(--muted); }
.foot-grid { display: flex; flex-wrap: wrap; gap: 26px; justify-content: space-between; }
.foot-links { display: flex; flex-wrap: wrap; gap: 8px 18px; }
.foot-links a { color: var(--ink-2); }
.foot-bottom { margin-top: 22px; padding-top: 16px; border-top: 1px solid var(--line); display: flex; flex-wrap: wrap; gap: 8px 18px; font-size: .8rem; }

.comments { margin: 2.6em 0 0; padding-top: 1.6em; border-top: 1px solid var(--line); }
.comments h2 { font-size: 1.15rem; margin: 0 0 8px; }
.comments-hint { font-size: .88rem; color: var(--muted); margin: 0 0 16px; }
.comment-form { display: grid; gap: 10px; border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; background: var(--card); }
.cf-row { display: flex; gap: 10px; flex-wrap: wrap; }
.cf-row input { flex: 1 1 180px; }
.comment-form input, .comment-form textarea { padding: 9px 12px; border: 1px solid var(--line); border-radius: 9px; background: var(--bg); color: var(--ink); font: inherit; font-size: .94rem; }
.comment-form textarea { resize: vertical; min-height: 92px; }
.comment-form .hp { position: absolute; left: -9999px; width: 1px; height: 1px; opacity: 0; }
.cf-actions { display: flex; align-items: center; gap: 12px; }
.cf-actions button { padding: 9px 18px; border: 0; border-radius: 9px; background: var(--accent); color: #fff; font: inherit; font-weight: 650; cursor: pointer; }
.cf-actions button:disabled { opacity: .6; cursor: default; }
.cf-status { font-size: .85rem; color: var(--muted); }
.comment-list { list-style: none; padding: 0; margin: 18px 0 0; display: grid; gap: 14px; }
.comment { border: 1px solid var(--line); border-radius: var(--radius-sm); padding: 12px 14px; background: var(--card); }
.comment .c-head { display: flex; gap: 10px; align-items: baseline; font-size: .82rem; color: var(--muted); margin-bottom: 4px; }
.comment .c-name { font-weight: 700; color: var(--ink); font-size: .92rem; }
.comment .c-body { font-size: .95rem; color: var(--ink-2); white-space: pre-wrap; overflow-wrap: anywhere; }
.comment .c-replies { list-style: none; padding: 0 0 0 12px; margin: 10px 0 0; border-left: 2px solid var(--accent-soft); display: grid; gap: 8px; }
.comment .c-reply .c-name { color: var(--accent-ink); }
.comments-empty { font-size: .9rem; color: var(--muted); }

.progress { position: fixed; top: 0; left: 0; height: 2px; background: var(--accent); width: 0; z-index: 60; transition: width .1s linear; }
.search-dialog { border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; width: min(560px, 92vw); background: var(--card); color: var(--ink); }
.search-dialog input { width: 100%; padding: 10px 12px; border: 1px solid var(--line); border-radius: 9px; font: inherit; background: var(--bg); color: var(--ink); }
.search-results { list-style: none; padding: 0; margin: 12px 0 0; max-height: 50vh; overflow: auto; }
.search-results a { display: block; padding: 9px 6px; border-radius: 7px; color: var(--ink); }
.search-results a:hover { background: var(--bg-soft); text-decoration: none; }
.print { display: none; }
@media print { .site-header, .site-footer, .toc-box, .progress, .band, .slot-ad { display: none; } .layout-article { grid-template-columns: 1fr; } }