:root{
  --ink:#131a2b; --navy:#0e1530; --navy2:#1b2550;
  --primary:#5b50e6; --primary-deep:#473ad1; --primary-soft:#edebfe;
  --accent:#13b6a4; --accent-deep:#0e9484;
  --bg:#f4f6fc; --bg-alt:#eef1fa; --card:#ffffff; --line:#e6e9f4; --line2:#d9deee;
  --text:#2c3344; --muted:#6a7388; --gold:#c2901f;
  --maxw:60rem;
  --r:16px; --shadow-sm:0 1px 2px rgba(19,26,43,.05); --shadow:0 8px 26px rgba(19,26,43,.09);
  --shadow-lg:0 24px 60px rgba(27,37,80,.18);
  --font:ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:var(--font);color:var(--text);background:var(--bg);line-height:1.65;font-size:1.0625rem;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
img{max-width:100%;display:block}
a{color:var(--primary-deep);text-underline-offset:2px}
a:hover{color:var(--primary)}
h1,h2,h3,h4{font-family:var(--font);color:var(--ink);line-height:1.16;margin:0}
.wrap{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:1.25rem}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;font-family:var(--font);font-weight:600;text-decoration:none;border-radius:12px;cursor:pointer;border:1.5px solid transparent;transition:transform .12s ease,background .2s ease,box-shadow .2s ease,border-color .2s ease}
.btn:active{transform:translateY(1px)}
.btn-primary{background:var(--primary);color:#fff;padding:.7rem 1.25rem;box-shadow:0 8px 20px rgba(91,80,230,.28)}
.btn-primary:hover{background:var(--primary-deep);box-shadow:0 10px 26px rgba(71,58,209,.36)}
.btn-lg{padding:1rem 2rem;font-size:1.06rem;border-radius:14px}

/* header */
.site-head{position:sticky;top:0;z-index:100;background:rgba(14,21,48,.92);backdrop-filter:saturate(150%) blur(12px);border-bottom:1px solid rgba(255,255,255,.08)}
.nav{display:flex;align-items:center;justify-content:space-between;height:4.5rem}
.brand{display:flex;align-items:center;gap:.6rem;text-decoration:none}
.brand img.logo{height:30px;width:auto;display:block}
.nav-links{display:flex;align-items:center;gap:1.6rem;list-style:none;margin:0;padding:0}
.nav-links a{color:#cdd5e6;text-decoration:none;font-size:.95rem;font-weight:500}
.nav-links a:hover{color:#fff}
.nav .btn-primary{padding:.6rem 1.15rem;font-size:.95rem}
@media (max-width:820px){.nav-links{display:none}}

/* breadcrumb + page head */
.page-wrap{padding-block:clamp(2.2rem,5vw,3.4rem)}
.crumbs{font-size:.85rem;color:var(--muted);margin:0 0 1.4rem}
.crumbs a{color:var(--muted);text-decoration:none}
.crumbs a:hover{color:var(--primary-deep);text-decoration:underline}
.crumbs span{margin:0 .45rem;color:#b6bdd0}
.page-head{max-width:46rem;margin:0 0 2.2rem}
.page-head h1{font-size:clamp(2rem,4.4vw,2.7rem);letter-spacing:-.01em;text-wrap:balance}
.page-head .lede{font-size:1.2rem;color:var(--muted);line-height:1.55;margin:1rem 0 0;max-width:42rem}
.updated{font-size:.85rem;color:var(--muted);margin:1.1rem 0 0}

/* article prose */
.prose{max-width:44rem;font-size:1.075rem;line-height:1.72;color:#373f52}
.prose h2{font-size:1.5rem;margin:2.6rem 0 .4rem;color:var(--ink);letter-spacing:-.01em;text-wrap:balance}
.prose h3{font-size:1.18rem;margin:1.8rem 0 .3rem;color:var(--ink)}
.prose p{margin:.85rem 0 1.15rem}
.prose ul,.prose ol{margin:.6rem 0 1.3rem;padding-left:1.35rem}
.prose li{margin:.5rem 0}
.prose li::marker{color:var(--primary)}
.prose strong{color:var(--ink);font-weight:650}
.prose a{color:var(--primary-deep);font-weight:550}
.prose code{background:var(--bg-alt);border:1px solid var(--line);border-radius:6px;padding:.05rem .35rem;font-size:.92em}
.lead-p{font-size:1.16rem;line-height:1.6;color:var(--ink)}
.note{background:#fff;border:1px solid var(--line);border-left:4px solid var(--accent);border-radius:12px;padding:1.1rem 1.25rem;margin:1.6rem 0}
.note p{margin:.3rem 0}
.cta-row{margin:2.4rem 0 .5rem;display:flex;flex-wrap:wrap;gap:.8rem;align-items:center}

/* contact form */
.cform{max-width:34rem;margin:1.8rem 0;background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow-sm);padding:1.6rem}
.cform label{display:block;font-weight:600;color:var(--ink);font-size:.92rem;margin:1rem 0 .35rem}
.cform label:first-child{margin-top:0}
.cform input,.cform textarea{width:100%;box-sizing:border-box;font-family:var(--font);font-size:1rem;padding:.8rem 1rem;border:1.5px solid var(--line2);border-radius:11px;color:var(--ink);outline:none;transition:border-color .15s,box-shadow .15s}
.cform input:focus,.cform textarea:focus{border-color:var(--primary);box-shadow:0 0 0 3px rgba(91,80,230,.14)}
.cform textarea{min-height:8rem;resize:vertical}
.cform .cbtn{width:100%;margin-top:1.2rem;border:none;cursor:pointer;border-radius:12px;padding:.9rem 1.2rem;font-family:var(--font);font-weight:700;font-size:1.04rem;color:#fff;background:linear-gradient(135deg,var(--primary),var(--accent));box-shadow:0 10px 22px rgba(91,80,230,.28)}
.cform .cbtn:hover{filter:brightness(1.05)}
.cform .cbtn:disabled{opacity:.7;cursor:default}
.cform .cnote{font-size:.8rem;color:var(--muted);margin:.9rem 0 0}
.cmsg{font-weight:600;margin:1rem 0 0}
.cmsg.ok{color:var(--accent-deep)}
.cmsg.bad{color:#d23c22}

/* footer */
footer.site-foot{background:var(--ink);color:#aab4c6;margin-top:3rem}
.foot-top{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr 1fr;gap:2rem;padding-block:3.2rem}
.foot-brand .brand{margin-bottom:1rem}
.foot-brand p{font-size:.92rem;color:#8c97ab;max-width:25rem}
.foot-col h4{color:#cdd4e2;font-size:.82rem;letter-spacing:.02em;margin:0 0 1rem;font-weight:700}
.foot-col ul{list-style:none;margin:0;padding:0}
.foot-col li{margin-bottom:.6rem}
.foot-col a{color:#aab4c6;text-decoration:none;font-size:.92rem}
.foot-col a:hover{color:#fff}
.foot-bottom{border-top:1px solid rgba(255,255,255,.1);padding-block:1.5rem;display:flex;flex-wrap:wrap;gap:1rem;align-items:center;justify-content:space-between;font-size:.86rem;color:#8190a6}
.langbar a{color:#aab4c6;text-decoration:none;padding:0 .35rem}
.langbar a[aria-current]{color:#fff;font-weight:700}
@media (max-width:820px){.foot-top{grid-template-columns:1fr 1fr;gap:1.7rem}}
@media (max-width:520px){.foot-top{grid-template-columns:1fr}}