:root{
  --bg:#f7f7f8; --card:#ffffff; --ink:#1a1d23; --muted:#5b6472;
  --accent:#2f6fed; --accent-dark:#1f4fc4; --border:#e4e7ec;
  --good:#1a8f4c; --warn:#b7791f; --bad:#c0392b;
  --radius:12px;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;background:var(--bg);color:var(--ink);line-height:1.6}
.container{max-width:1000px;margin:0 auto;padding:0 20px}
a{color:var(--accent);text-decoration:none}
a:hover{color:var(--accent-dark);text-decoration:underline}

/* header */
.site-header{background:#fff;border-bottom:1px solid var(--border);position:sticky;top:0;z-index:10}
.nav{display:flex;align-items:center;justify-content:space-between;padding:14px 20px}
.brand{font-weight:800;font-size:1.15rem;color:var(--ink)}
.brand:hover{text-decoration:none;color:var(--accent)}
.main-nav a{margin-left:18px;color:var(--muted);font-weight:600}
.main-nav a:hover{color:var(--accent);text-decoration:none}

/* layout */
main{padding:28px 20px 60px}
h1{font-size:2rem;line-height:1.25;margin:0 0 8px}
h2{font-size:1.35rem;margin:0 0 12px}
.layout{display:grid;grid-template-columns:1fr 280px;gap:28px;align-items:start}
.main-col{min-width:0}
.sidebar{position:sticky;top:76px}
.hero{padding:26px 0 10px}
.hero .tagline{font-size:1.2rem;color:var(--muted);margin:0 0 12px}
.hero-sub{color:var(--muted);max-width:70ch}
.lead{font-size:1.08rem;color:var(--muted);max-width:70ch}
.page-title{margin-top:26px}
.empty{color:var(--muted)}

/* widgets */
.widget{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:14px 16px;margin-bottom:16px}
.widget-title{margin:0 0 10px;font-size:1rem}
.widget-list{list-style:none;margin:0;padding:0}
.widget-list li{margin:6px 0}
.widget-content{font-size:.92rem;color:var(--muted)}

/* cards grid */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px}
.card{display:block;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:16px 18px;color:var(--ink)}
.card:hover{border-color:var(--accent);transform:translateY(-2px);box-shadow:0 6px 18px rgba(0,0,0,.06)}
.card-title{margin:0 0 6px;font-size:1.05rem}
.card-title a{color:var(--ink)}
.card-title a:hover{color:var(--accent);text-decoration:none}
.card-excerpt{margin:0 0 8px;color:var(--muted);font-size:.92rem}
.card-date{color:var(--muted);font-size:.82rem}

/* pagination */
.pagination{display:flex;gap:10px;align-items:center;margin-top:24px}
.pagination a{background:var(--card);border:1px solid var(--border);border-radius:8px;padding:6px 12px;color:var(--accent)}
.pagination .current{color:var(--muted);font-size:.9rem}

/* article */
.post{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:26px 28px}
.post h1{margin-bottom:6px}
.post-meta{color:var(--muted);font-size:.88rem;margin-bottom:18px}
.post-content h2{margin-top:26px}
.post-content img{max-width:100%;border-radius:8px}
.post-content pre{background:#0f172a;color:#e2e8f0;padding:14px 16px;border-radius:10px;overflow-x:auto;font-size:.88rem}
.post-content code{background:#eef1f5;padding:1px 6px;border-radius:5px;font-size:.88em}
.post-content pre code{background:transparent;padding:0}
.post-content blockquote{border-left:3px solid var(--accent);margin-left:0;padding-left:16px;color:var(--muted)}
.post-tags{margin-top:22px;font-size:.9rem}
.tag{display:inline-block;background:#eef1f5;border-radius:20px;padding:1px 9px;font-size:.75rem;color:var(--muted);margin-left:6px}
.post-nav{display:flex;justify-content:space-between;gap:16px;margin-top:26px;border-top:1px solid var(--border);padding-top:18px;font-size:.92rem}
.post-nav .next{margin-left:auto;text-align:right}

/* related / comments */
.block{margin-top:28px}
.related .card h3{margin:0 0 6px;font-size:1rem}
.related .card p{color:var(--muted);font-size:.9rem}
.comment{display:flex;gap:12px;background:var(--card);border:1px solid var(--border);border-radius:8px;padding:12px 14px;margin:10px 0}
.comment-avatar{flex:0 0 40px;height:40px;border-radius:50%;background:var(--accent);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700}
.comment-body strong{display:block}
.comment-body p{margin:4px 0 0}
.comment-form{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:16px 18px;margin-top:16px;display:grid;gap:10px}
.comment-form input,.comment-form textarea{padding:9px 11px;border:1px solid var(--border);border-radius:8px;font-size:1rem;width:100%}
.comment-form textarea{min-height:90px}
.comment-form button{justify-self:start;background:var(--accent);color:#fff;border:0;border-radius:8px;padding:10px 20px;font-weight:700;cursor:pointer}
.comment-form button:hover{background:var(--accent-dark)}

/* footer */
.site-footer{background:#fff;border-top:1px solid var(--border);padding:30px 0 24px;font-size:.9rem;color:var(--muted)}
.tagline-line{margin:0 0 10px;color:var(--ink);font-weight:600}
.disclosure{font-size:.8rem;margin:0 0 8px}
.copy{margin:0;font-size:.8rem}

@media (max-width:760px){
  .layout{grid-template-columns:1fr}
  .sidebar{position:static;margin-top:24px}
  .main-nav a{margin-left:12px}
  .post{padding:18px 16px}
}
/* ---- calculators ---- */
.calc-form{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:18px 20px;margin:18px 0 6px}
.calc-inputs{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:14px}
.field label{display:block;font-size:.85rem;font-weight:600;color:var(--muted)}
.field input,.field select{width:100%;margin-top:4px;padding:9px 11px;border:1px solid var(--border);border-radius:8px;font-size:1rem;background:#fff;color:var(--ink)}
.field input:focus,.field select:focus{outline:2px solid var(--accent);border-color:var(--accent)}
.input-wrap{position:relative;display:block}
.input-wrap input{padding-right:64px}
.input-wrap .suffix{position:absolute;right:12px;top:50%;transform:translateY(-40%);color:var(--muted);font-size:.8rem;pointer-events:none}
.calc-results{margin:10px 0 4px}
.calc-result{display:flex;justify-content:space-between;gap:16px;align-items:baseline;background:var(--card);border:1px solid var(--border);border-left:4px solid var(--border);border-radius:8px;padding:10px 14px;margin:8px 0}
.calc-result .cr-label{color:var(--muted);font-size:.9rem}
.calc-result .cr-value{font-weight:800;font-variant-numeric:tabular-nums;white-space:nowrap}
.calc-result.rank-good{border-left-color:var(--good)}
.calc-result.rank-good .cr-value{color:var(--good)}
.calc-result.rank-warn{border-left-color:var(--warn)}
.calc-result.rank-warn .cr-value{color:var(--warn)}
.calc-result.rank-bad{border-left-color:var(--bad)}
.calc-result.rank-bad .cr-value{color:var(--bad)}
.calc-note{font-size:.78rem;color:var(--muted)}
.crumbs{font-size:.9rem;color:var(--muted);margin-bottom:14px}
/* ---- header: search + mobile nav ---- */
.search-form{margin-left:14px}
.search-form input{padding:7px 12px;border:1px solid var(--border);border-radius:20px;font-size:.9rem;width:150px;background:#f7f7f8;color:var(--ink)}
.search-form input:focus{outline:2px solid var(--accent);border-color:var(--accent)}
.nav-toggle{display:none;background:none;border:0;cursor:pointer;padding:6px;flex-direction:column;gap:4px}
.nav-toggle span{display:block;width:20px;height:2px;background:var(--ink);border-radius:2px}

/* ---- home: tools strip ---- */
.tools-strip{margin-top:22px}
.tool-strip{display:flex;flex-wrap:wrap;gap:10px;margin:10px 0 4px}
.pill{background:var(--card);border:1px solid var(--border);border-radius:20px;padding:6px 14px;font-size:.88rem;color:var(--ink);font-weight:600}
.pill:hover{border-color:var(--accent);color:var(--accent);text-decoration:none}

/* ---- post: author box ---- */
.author-box{background:var(--card);border:1px solid var(--border);border-left:4px solid var(--accent);border-radius:var(--radius);padding:14px 16px;margin-top:18px}
.author-box strong{display:block}
.author-box p{margin:4px 0 0;color:var(--muted);font-size:.9rem}

/* ---- footer: newsletter band ---- */
.newsletter-band{background:#eef3ff;border:1px solid #dbe6ff;border-radius:var(--radius);padding:18px 20px;margin-bottom:18px}
.newsletter-band h3{margin:0 0 6px;font-size:1.1rem}
.newsletter-note{margin:0;color:var(--muted);font-size:.9rem}

@media (max-width:760px){
  .search-form{display:none}
  .nav-toggle{display:flex}
  .main-nav{display:none;position:absolute;top:56px;left:0;right:0;background:#fff;border-bottom:1px solid var(--border);padding:10px 20px;flex-direction:column}
  .main-nav.open{display:flex}
  .main-nav a{margin:8px 0}
}