:root{
  --bg:#f7fbfb;--surface:#ffffff;--surface-2:#f1f6f6;
  --text:#0e1a1a;--muted:#5a6b6b;--border:#dceaea;
  --primary:#0ea5a4;--primary-600:#0b8786;--primary-50:#e6f7f6;
  --accent:#1f7ae0;--accent-50:#e6f0fb;
  --success:#16a34a;--warning:#d97706;--danger:#dc2626;
  --radius:14px;--radius-lg:20px;--shadow:0 8px 24px -12px rgba(15,42,42,.15);
  --shadow-soft:0 4px 16px -8px rgba(15,42,42,.12);
  --container:1140px;
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Inter,system-ui,sans-serif;
}
[data-theme="dark"]{
  --bg:#0b1414;--surface:#10201f;--surface-2:#15302e;
  --text:#e8f3f2;--muted:#9bb1af;--border:#1f3a37;
  --primary:#2dd4bf;--primary-600:#5eead4;--primary-50:#0f2a28;
  --accent:#60a5fa;--accent-50:#0f2236;
  --shadow:0 8px 24px -12px rgba(0,0,0,.5);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:var(--font);background:var(--bg);color:var(--text);line-height:1.6;-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
a{color:var(--primary-600);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3,h4{font-family:var(--font);line-height:1.2;color:var(--text);margin:0 0 .6em}
h1{font-size:clamp(1.8rem,3.2vw,2.6rem);font-weight:800;letter-spacing:-.02em}
h2{font-size:clamp(1.4rem,2.4vw,2rem);font-weight:700;letter-spacing:-.01em}
h3{font-size:1.15rem;font-weight:700}
p{margin:0 0 1rem}
.container{width:100%;max-width:var(--container);margin:0 auto;padding:0 1.25rem}
.skip{position:absolute;left:-9999px;top:0;background:#000;color:#fff;padding:.5rem 1rem}
.skip:focus{left:1rem;top:1rem;z-index:1000}
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.78);backdrop-filter:saturate(180%) blur(12px);-webkit-backdrop-filter:saturate(180%) blur(12px);border-bottom:1px solid var(--border)}
[data-theme="dark"] .site-header{background:rgba(11,20,20,.7)}
.header-inner{display:flex;align-items:center;gap:1rem;padding:.85rem 1.25rem}
.brand{display:inline-flex;align-items:center;gap:.55rem;font-weight:800;font-size:1.1rem;color:var(--text)}
.brand:hover{text-decoration:none}
.brand-mark{width:32px;height:32px;display:grid;place-items:center;background:linear-gradient(135deg,var(--primary),var(--accent));color:#fff;border-radius:9px;font-weight:900}
.brand-dot{color:var(--primary)}
.site-nav{margin-left:auto}
.site-nav ul{display:flex;gap:.25rem;list-style:none;padding:0;margin:0}
.site-nav a{padding:.5rem .85rem;border-radius:999px;color:var(--text);font-weight:500;font-size:.95rem}
.site-nav a:hover{background:var(--primary-50);text-decoration:none;color:var(--primary-600)}
.header-actions{display:flex;gap:.4rem;align-items:center}
.icon-btn{display:inline-grid;place-items:center;width:38px;height:38px;border-radius:10px;background:var(--surface-2);border:1px solid var(--border);color:var(--text);cursor:pointer;font-size:1rem}
.icon-btn:hover{background:var(--primary-50)}
.nav-toggle{display:none;background:none;border:0;flex-direction:column;gap:4px;cursor:pointer;padding:8px}
.nav-toggle span{width:22px;height:2px;background:var(--text);border-radius:2px;transition:.2s}
@media (max-width: 880px){
  .nav-toggle{display:flex;order:3}
  .header-actions{order:2;margin-left:auto}
  .site-nav{order:4;width:100%;max-height:0;overflow:hidden;transition:max-height .3s}
  .site-nav ul{flex-direction:column;padding:.5rem 0}
  .site-nav.open{max-height:480px}
}
.hero{padding:4rem 0 3rem;background:radial-gradient(1200px 420px at 20% 0%,var(--primary-50) 0%,transparent 60%),radial-gradient(900px 360px at 100% 10%,var(--accent-50) 0%,transparent 60%)}
.hero h1{max-width:780px}
.hero p.lead{font-size:1.15rem;color:var(--muted);max-width:680px}
.hero-search{display:flex;gap:.5rem;margin-top:1.5rem;background:var(--surface);padding:.4rem;border:1px solid var(--border);border-radius:14px;max-width:560px;box-shadow:var(--shadow-soft)}
.hero-search input{flex:1;border:0;background:transparent;padding:.85rem 1rem;font-size:1rem;color:var(--text);outline:none}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.45rem;padding:.7rem 1.1rem;border-radius:10px;border:1px solid transparent;background:var(--primary);color:#fff;font-weight:600;cursor:pointer;font-size:.95rem;transition:transform .05s,background .2s}
.btn:hover{background:var(--primary-600);text-decoration:none;color:#fff}
.btn:active{transform:translateY(1px)}
.btn.ghost{background:transparent;color:var(--text);border-color:var(--border)}
.btn.ghost:hover{background:var(--surface-2);color:var(--text)}
.btn.accent{background:var(--accent)}
section{padding:3rem 0}
.section-head{display:flex;justify-content:space-between;align-items:end;gap:1rem;margin-bottom:1.5rem;flex-wrap:wrap}
.section-head p{color:var(--muted);margin:.3rem 0 0}
.grid{display:grid;gap:1rem}
.grid.cols-2{grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}
.grid.cols-3{grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
.grid.cols-4{grid-template-columns:repeat(auto-fit,minmax(200px,1fr))}
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:1.25rem;box-shadow:var(--shadow-soft);transition:transform .15s,box-shadow .15s,border-color .15s}
.card:hover{transform:translateY(-2px);box-shadow:var(--shadow);border-color:color-mix(in oklab,var(--primary) 35%,var(--border))}
.card h3{margin:0 0 .35rem;font-size:1.05rem}
.card p{color:var(--muted);margin:0;font-size:.92rem}
.card .tag{display:inline-block;font-size:.72rem;text-transform:uppercase;letter-spacing:.05em;background:var(--primary-50);color:var(--primary-600);padding:.2rem .55rem;border-radius:999px;margin-bottom:.6rem;font-weight:600}
.card-link{display:block;color:inherit}
.card-link:hover{text-decoration:none}
.feature{padding:1.5rem;border-radius:var(--radius-lg);background:linear-gradient(180deg,rgba(255,255,255,.7),rgba(255,255,255,.4));border:1px solid var(--border);backdrop-filter:blur(8px)}
[data-theme="dark"] .feature{background:linear-gradient(180deg,rgba(255,255,255,.04),rgba(255,255,255,.02))}
.feature .ico{width:44px;height:44px;border-radius:12px;background:var(--primary-50);color:var(--primary-600);display:grid;place-items:center;font-size:1.3rem;margin-bottom:.7rem}
.tool-layout{display:grid;grid-template-columns:1fr 320px;gap:2rem}
@media (max-width: 960px){ .tool-layout{grid-template-columns:1fr} }
.tool-form{display:grid;gap:.9rem}
.field{display:grid;gap:.35rem}
.field label{font-weight:600;font-size:.92rem}
.field input, .field select{padding:.7rem .85rem;border-radius:10px;border:1px solid var(--border);background:var(--surface);color:var(--text);font-size:1rem;font-family:inherit}
.field input:focus, .field select:focus{outline:2px solid var(--primary);outline-offset:1px;border-color:var(--primary)}
.result-box{background:var(--surface-2);border:1px dashed var(--border);border-radius:var(--radius);padding:1.25rem;margin-top:1rem}
.result-box h3{margin-top:0}
.result-row{display:flex;justify-content:space-between;border-bottom:1px solid var(--border);padding:.55rem 0;gap:1rem}
.result-row:last-child{border-bottom:0}
.result-row strong{color:var(--primary-600)}
.toolbar{display:flex;gap:.5rem;flex-wrap:wrap;margin-top:.85rem}
.tool-aside{display:grid;gap:1rem;align-content:start}
.disclaimer{background:#fff7ed;border:1px solid #fed7aa;color:#7c2d12;padding:1rem;border-radius:var(--radius);font-size:.92rem;margin:1rem 0}
[data-theme="dark"] .disclaimer{background:#2a1809;border-color:#7c2d12;color:#fbbf24}
.breadcrumb{padding:1rem 1.25rem 0}
.breadcrumb ol{list-style:none;display:flex;flex-wrap:wrap;gap:.4rem;padding:0;margin:0;font-size:.88rem;color:var(--muted)}
.breadcrumb li+li::before{content:"\203A";margin-right:.4rem;color:var(--muted)}
.breadcrumb a{color:var(--muted)}
.faq details{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:1rem 1.15rem;margin-bottom:.6rem}
.faq summary{cursor:pointer;font-weight:600;list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";float:right;font-weight:400;color:var(--muted)}
.faq details[open] summary::after{content:"\2212"}
.site-footer{background:var(--surface);border-top:1px solid var(--border);margin-top:3rem;padding:3rem 0 1rem}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:2rem}
@media (max-width:760px){ .footer-grid{grid-template-columns:1fr 1fr} }
.footer-grid h4{font-size:.95rem;margin-bottom:.7rem}
.footer-grid ul{list-style:none;padding:0;margin:0;display:grid;gap:.4rem;font-size:.92rem}
.footer-grid a{color:var(--muted)}
.footer-grid a:hover{color:var(--primary-600)}
.foot-bottom{border-top:1px solid var(--border);margin-top:2rem;padding-top:1rem;color:var(--muted);font-size:.85rem;text-align:center}
.muted{color:var(--muted)}
.newsletter{background:linear-gradient(135deg,var(--primary),var(--accent));color:#fff;border-radius:var(--radius-lg);padding:2rem;display:grid;gap:1rem;text-align:center}
.newsletter h2{color:#fff}
.newsletter form{display:flex;gap:.5rem;max-width:520px;margin:.5rem auto 0;background:#fff;padding:.4rem;border-radius:12px}
.newsletter input{flex:1;border:0;padding:.75rem 1rem;font-size:1rem;outline:none}
.newsletter .btn{background:#0b3b3a;color:#fff}
.to-top{position:fixed;right:1rem;bottom:1rem;width:42px;height:42px;border-radius:50%;border:0;background:var(--primary);color:#fff;font-size:1.2rem;cursor:pointer;box-shadow:var(--shadow);opacity:0;pointer-events:none;transition:.2s}
.to-top.show{opacity:1;pointer-events:auto}
article.post{max-width:780px;margin:0 auto;background:var(--surface);padding:2rem;border-radius:var(--radius);border:1px solid var(--border)}
article.post img{border-radius:12px;margin:1rem 0}
.author-box{display:flex;gap:1rem;align-items:center;padding:1rem;background:var(--surface-2);border-radius:12px;margin-top:2rem}
.avatar{width:56px;height:56px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--accent));display:grid;place-items:center;color:#fff;font-weight:700}
.toc{background:var(--surface-2);border:1px solid var(--border);border-radius:12px;padding:1rem 1.25rem;margin:1rem 0}
.toc h4{margin-top:0}
.toc ul{margin:0;padding-left:1.2rem}
.form-block{display:grid;gap:.8rem;max-width:560px}
.form-block input,.form-block textarea{padding:.75rem .9rem;border:1px solid var(--border);border-radius:10px;background:var(--surface);color:var(--text);font-family:inherit;font-size:1rem}
.form-block textarea{min-height:140px;resize:vertical}
@media print{
  .site-header,.site-footer,.to-top,.toolbar,.tool-aside,.newsletter{display:none!important}
  body{background:#fff;color:#000}
}