:root{--bg:#ffffff;--surface:#f6f6f4;--line:#e4e4e0;--ink:#14161a;--muted:#6a6f76;--accent:#14161a;--accent-ink:#ffffff;--primary:#14161a;--radius:24px;--font:"Poppins", system-ui, -apple-system, "Segoe UI", sans-serif;--display:"Poppins", system-ui, -apple-system, "Segoe UI", sans-serif;--mono:ui-monospace, Menlo, monospace;--footer-bg:#ffffff;--footer-ink:#6a6f76}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--font);font-size:17px;line-height:1.65;-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none}
.wrap{width:min(1120px,92vw);margin:0 auto}
h1,h2,h3,h4{font-family:var(--display);line-height:1.15;letter-spacing:-.015em;margin:0}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:13px 22px;border-radius:calc(var(--radius) * 2);border:1.5px solid var(--ink);font-weight:700;font-size:15px;line-height:1;cursor:pointer;transition:transform .2s,background .2s,color .2s,border-color .2s;white-space:nowrap}
.btn:hover{transform:translateY(-2px)}
.btn-solid{background:var(--accent);border-color:var(--accent);color:var(--accent-ink)}
.btn-solid:hover{filter:brightness(.92)}
.btn-line{background:transparent;color:var(--ink)}
.btn-line:hover{background:var(--ink);color:var(--bg)}
.btn-sm{padding:9px 16px;font-size:14px}
/* header */
.bh{position:sticky;top:0;z-index:50;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.bh-inner{display:flex;align-items:center;gap:26px;height:66px}
.bh-brand{font-family:var(--display);font-weight:800;font-size:19px;letter-spacing:.02em;color:var(--primary)}
.bh-brand sup{font-size:.55em}.bh-brand em{font-style:normal;color:var(--muted)}.bh-brand b{font-weight:900;color:var(--accent)}
.bh-nav{display:flex;gap:22px;margin-left:auto}
.bh-nav a{font-weight:600;font-size:15px;color:var(--ink);opacity:.8;padding:6px 0;border-bottom:2px solid transparent}
.bh-nav a:hover,.bh-nav a.is-active{opacity:1;border-color:var(--accent)}
/* index */
.blog-hero{padding:72px 0 40px;max-width:46rem}
.kicker{font-family:var(--mono);font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--accent);font-weight:700;margin:0 0 12px}
.blog-hero h1{font-size:clamp(34px,5vw,56px);font-weight:800}
.lead{font-size:19px;color:var(--muted);margin:16px 0 0}
.pc-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.pc-grid-index{padding-bottom:40px}
.pc{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;display:flex;flex-direction:column;transition:transform .25s,box-shadow .25s}
.pc:hover{transform:translateY(-4px);box-shadow:0 20px 44px -22px rgba(0,0,0,.35)}
.pc-img{display:block;aspect-ratio:16/10;overflow:hidden;background:var(--line)}
.pc-img img{width:100%;height:100%;object-fit:cover}
.pc-body{padding:20px 22px 24px;display:flex;flex-direction:column;gap:10px;flex:1}
.pc-meta{font-family:var(--mono);font-size:12px;color:var(--muted);margin:0;letter-spacing:.04em}
.pc-title{font-size:20px;font-weight:800}
.pc-title a:hover{color:var(--accent)}
.pc-desc{margin:0;color:var(--muted);font-size:15px;line-height:1.55;flex:1}
.pc-more{font-weight:700;font-size:14.5px;color:var(--accent);margin-top:4px}
/* post */
.crumbs{display:flex;flex-wrap:wrap;gap:8px;font-size:13.5px;color:var(--muted);padding:22px 0 0}
.crumbs a:hover{color:var(--accent)}
.crumbs span[aria-current]{color:var(--ink);opacity:.75;max-width:60ch;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.post{padding-bottom:60px}
.post article{max-width:760px;margin:0 auto}
.post-head{padding:34px 0 22px}
.post-head h1{font-size:clamp(30px,4.4vw,46px);font-weight:800}
.post-meta{margin:14px 0 0;font-family:var(--mono);font-size:12.5px;letter-spacing:.04em;color:var(--muted)}
.post-cover{margin:0 0 30px;border-radius:var(--radius);overflow:hidden;background:var(--surface)}
.post-cover img{width:100%;max-height:480px;object-fit:cover}
.post-body{font-size:17.5px}
.post-body>p:first-of-type{font-size:20px;color:var(--ink)}
.post-body h2{font-size:clamp(24px,3vw,31px);font-weight:800;margin:44px 0 14px;scroll-margin-top:90px}
.post-body h3{font-size:21px;font-weight:700;margin:30px 0 10px}
.post-body h4{font-size:18px;margin:22px 0 8px}
.post-body p{margin:0 0 18px}
.post-body a{color:var(--accent);text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:3px}
.post-body a:hover{text-decoration-thickness:2px}
.post-body ul,.post-body ol{padding-left:24px;margin:0 0 20px}
.post-body li{margin:0 0 8px}
.post-body li::marker{color:var(--accent);font-weight:700}
.post-body blockquote{margin:26px 0;padding:18px 22px;border-left:4px solid var(--accent);background:var(--surface);border-radius:0 var(--radius) var(--radius) 0}
.post-body blockquote p{margin:0;font-size:18px;font-weight:600}
.post-body strong{font-weight:700}
.post-body hr{border:0;border-top:1px solid var(--line);margin:34px 0}
.table-wrap{overflow-x:auto;margin:0 0 24px;border:1px solid var(--line);border-radius:var(--radius)}
.post-body table{border-collapse:collapse;width:100%;font-size:15.5px;min-width:520px}
.post-body th,.post-body td{text-align:left;padding:12px 14px;border-bottom:1px solid var(--line);vertical-align:top}
.post-body th{background:var(--surface);font-weight:700;font-size:14px;letter-spacing:.02em}
.post-body tr:last-child td{border-bottom:0}
.toc{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:18px 22px;margin:0 0 30px}
.toc-h{margin:0 0 8px;font-family:var(--mono);font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted)}
.toc ol{margin:0;padding-left:20px;columns:2;column-gap:28px}
.toc li{margin:4px 0;font-size:15px;break-inside:avoid}
.toc a{color:var(--ink)}.toc a:hover{color:var(--accent)}
/* product box */
.pb{display:grid;grid-template-columns:200px 1fr;gap:24px;align-items:center;background:var(--surface);border:1.5px solid var(--line);border-radius:var(--radius);padding:22px;margin:34px 0}
.pb-end{margin-top:44px}
.pb-img{display:block;aspect-ratio:1;border-radius:calc(var(--radius) - 6px);overflow:hidden;background:var(--bg)}
.pb-img img{width:100%;height:100%;object-fit:cover}
.pb-kicker{margin:0 0 4px;font-family:var(--mono);font-size:11.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--accent);font-weight:700}
.pb-name{margin:0;font-family:var(--display);font-size:22px;font-weight:800;line-height:1.2}
.pb-price{margin:8px 0 14px;font-size:24px;font-weight:800;display:flex;flex-wrap:wrap;gap:4px 12px;align-items:baseline}
.pb-price span{font-size:14px;font-weight:500;color:var(--muted)}
.pb-actions{display:flex;flex-wrap:wrap;gap:10px}
/* faq */
.faqs{margin:44px 0 0}
.faqs h2{font-size:clamp(24px,3vw,31px);font-weight:800;margin:0 0 16px}
.faq{border:1px solid var(--line);border-radius:calc(var(--radius) - 8px);background:var(--surface);margin:0 0 10px;padding:0 18px}
.faq summary{cursor:pointer;font-weight:700;padding:15px 0;list-style:none;display:flex;justify-content:space-between;gap:14px;align-items:center}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-family:var(--mono);font-size:20px;color:var(--accent);flex:none}
.faq[open] summary::after{content:"–"}
.faq-a{padding:0 0 16px;color:var(--ink);font-size:16px}
.related{margin:52px 0 0}
.related h2{font-size:26px;font-weight:800;margin:0 0 18px}
.back{margin:36px 0 0;font-weight:700}.back a:hover{color:var(--accent)}
.sibs{padding:20px 0 64px}
.sibs h2{font-size:26px;font-weight:800;margin:0 0 18px}
.sib-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:14px}
.sib{display:flex;flex-direction:column;gap:4px;padding:16px 18px;border:1px solid var(--line);border-radius:calc(var(--radius) - 6px);background:var(--surface);transition:transform .2s}
.sib:hover{transform:translateY(-3px);border-color:var(--accent)}
.sib strong{font-size:15.5px}.sib span{font-size:13.5px;color:var(--muted)}
/* footer */
.bf{background:var(--footer-bg);color:var(--footer-ink);padding:48px 0 28px;margin-top:20px;border-top:1px solid var(--line)}
.bf-grid{display:grid;grid-template-columns:1.2fr 1fr;gap:40px}
.bf-brand{margin:0 0 10px;font-family:var(--display);font-weight:800;font-size:20px;color:var(--footer-ink)}
.bf-brand b{color:var(--accent)}.bf-brand em{font-style:normal;opacity:.7}
.bf-note{margin:0 0 16px;font-size:14.5px;line-height:1.6;max-width:44ch}
.bf-note a{text-decoration:underline}
.bf-links{display:flex;flex-wrap:wrap;gap:6px 18px;font-size:14px;font-weight:600}
.bf-links a:hover{color:var(--accent)}
.bf-h{margin:0 0 10px;font-family:var(--mono);font-size:12px;letter-spacing:.12em;text-transform:uppercase;opacity:.8}
.bf-sib{list-style:none;margin:0;padding:0;display:grid;gap:8px}
.bf-sib li{display:flex;flex-direction:column;font-size:14px}
.bf-sib a{font-weight:700}.bf-sib a:hover{color:var(--accent)}.bf-sib span{opacity:.7;font-size:13px}
.bf-copy{margin:30px 0 0;padding-top:18px;border-top:1px solid rgba(128,128,128,.25);font-size:12.5px;opacity:.75}
@media (max-width:900px){.pc-grid{grid-template-columns:1fr 1fr}.bf-grid{grid-template-columns:1fr}}
@media (max-width:640px){body{font-size:16px}.bh-nav{display:none}.bh-cta{margin-left:auto}.pc-grid{grid-template-columns:1fr}.blog-hero{padding:44px 0 28px}.pb{grid-template-columns:1fr}.pb-img{aspect-ratio:16/9}.toc ol{columns:1}.post-body{font-size:16.5px}.crumbs span[aria-current]{display:none}}