:root{
  --ink:#12161d; --paper:#f4f6fb; --steel:#1d2a3a; --steel2:#24344a;
  --amber:#f5a623; --amber-d:#d8880c; --line:#d7deea; --muted:#5b6675;
  --card:#ffffff; --good:#1f8a54; --bad:#c23b3b; --shadow:0 6px 22px rgba(18,30,50,.10);
}
*{box-sizing:border-box}
html,body{width:100%;overflow-x:hidden;margin:0}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  color:var(--ink);background:var(--paper);line-height:1.66;font-size:17px;-webkit-text-size-adjust:100%}
.wrap{max-width:1060px;margin:0 auto;padding:0 22px}
a{color:var(--amber-d)}
img{max-width:100%;height:auto;display:block}
h1,h2,h3{line-height:1.22;color:var(--steel);font-weight:800;letter-spacing:-.01em}
h1{font-size:2.05rem;margin:.2em 0 .35em}
h2{font-size:1.5rem;margin:1.9rem 0 .6rem;padding-top:.2rem}
h3{font-size:1.16rem;margin:1.3rem 0 .4rem}
p{margin:.7rem 0}
main{display:block;padding-bottom:2.4rem}

/* header */
.site-head{background:var(--steel);color:#fff;position:sticky;top:0;z-index:40;box-shadow:0 2px 10px rgba(0,0,0,.22)}
.head-row{display:flex;align-items:center;justify-content:space-between;flex-wrap:nowrap;gap:12px;min-height:60px}
.brand-logo{color:#fff;text-decoration:none;font-weight:800;font-size:1.18rem;white-space:nowrap;letter-spacing:.2px}
.brand-logo .spark{color:var(--amber)}
.nav-block{display:flex;align-items:center;gap:14px;flex-wrap:nowrap;margin-left:auto}
.nav-main{display:flex;align-items:center;gap:4px;flex-wrap:nowrap;list-style:none;margin:0;padding:0}
.nav-main a{color:#e8edf5;text-decoration:none;font-size:.94rem;font-weight:600;padding:8px 9px;border-radius:7px;white-space:nowrap}
.nav-main a:hover,.nav-main a[aria-current="page"]{background:rgba(255,255,255,.12);color:#fff}
.cta-top{background:var(--amber);color:#20140a !important;font-weight:800;padding:9px 15px;border-radius:8px;text-decoration:none;white-space:nowrap}
.cta-top:hover{background:#ffb739}
.burger{display:none;margin-left:auto;background:transparent;border:1.5px solid rgba(255,255,255,.5);
  color:#fff;border-radius:8px;width:44px;height:40px;font-size:1.25rem;cursor:pointer;align-items:center;justify-content:center}

/* breadcrumb */
.crumbs{font-size:.86rem;color:var(--muted);padding:.7rem 0 .1rem}
.crumbs a{color:var(--muted);text-decoration:none}
.crumbs a:hover{text-decoration:underline}

/* hero */
.hero{background:linear-gradient(160deg,var(--steel) 0%,var(--steel2) 100%);color:#fff;padding:.4rem 0 1.6rem}
.hero h1{color:#fff}
.hero .lede{font-size:1.12rem;color:#d4ddea;max-width:64ch}
.hero-fig{margin:1.1rem 0 0;border-radius:14px;overflow:hidden;box-shadow:var(--shadow);cursor:zoom-in}
.hero-fig img{width:100%;height:auto}
figcaption{font-size:.8rem;color:var(--muted);padding:.4rem 2px 0}

.snippet{background:#fff;border:1px solid var(--line);border-left:5px solid var(--amber);
  border-radius:10px;padding:.9rem 1.1rem;margin:1.1rem 0;box-shadow:var(--shadow);font-size:1.04rem}

/* generic cards / lists */
.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:1rem 1.15rem;box-shadow:var(--shadow);margin:1rem 0}
ul.ticks{list-style:none;padding-left:0;margin:.7rem 0}
ul.ticks li{padding:.28rem 0 .28rem 1.7rem;position:relative}
ul.ticks li:before{content:"▲";color:var(--amber-d);position:absolute;left:0;top:.36rem;font-size:.8rem}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:1rem}
.proscons{display:grid;grid-template-columns:1fr 1fr;gap:1rem}
.proscons .box{border-radius:12px;padding:.9rem 1.1rem;border:1px solid var(--line)}
.proscons .pro{background:#eefaf2}.proscons .con{background:#fdeeee}
.proscons h3{margin-top:.2rem}
.proscons ul{margin:.3rem 0;padding-left:1.1rem}

/* table */
.table-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch;margin:1rem 0;border:1px solid var(--line);border-radius:12px}
table{border-collapse:collapse;width:100%;min-width:440px;font-size:.96rem}
th,td{text-align:left;padding:.62rem .8rem;border-bottom:1px solid var(--line)}
th{background:var(--steel);color:#fff;font-weight:700}
tbody tr:nth-child(even){background:#f7f9fd}

/* tabs */
.tabs{margin:1.1rem 0}
.tabbar{display:flex;flex-wrap:wrap;gap:6px;border-bottom:2px solid var(--line);margin-bottom:.2rem}
.tabbtn{background:#e9eef7;border:none;border-radius:9px 9px 0 0;padding:.55rem .95rem;font-weight:700;
  color:var(--steel);cursor:pointer;font-size:.95rem}
.tabbtn[aria-selected="true"]{background:var(--steel);color:#fff}
.tabp{padding:.4rem 0}
.tabp[hidden]{display:none}

/* calculator */
.calc{background:var(--steel2);color:#fff;border-radius:14px;padding:1.15rem 1.2rem;margin:1.2rem 0;box-shadow:var(--shadow)}
.calc h3{color:#fff;margin-top:0}
.calc label{display:block;font-size:.9rem;color:#c9d4e4;margin:.7rem 0 .2rem}
.calc input[type=range]{width:100%;accent-color:var(--amber)}
.calc .row{display:flex;justify-content:space-between;align-items:baseline;gap:10px;flex-wrap:wrap}
.calc .out{font-size:1.7rem;font-weight:800;color:var(--amber)}
.calc .val{font-weight:700;color:#fff}
.calc .cap{font-size:.82rem;color:#aebccf;margin-top:.5rem}

/* faq */
.faq details{border:1px solid var(--line);border-radius:10px;background:#fff;margin:.6rem 0;padding:.2rem .3rem}
.faq summary{cursor:pointer;font-weight:700;color:var(--steel);padding:.7rem .8rem;list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq summary:before{content:"+";color:var(--amber-d);font-weight:800;margin-right:.5rem}
.faq details[open] summary:before{content:"–"}
.faq .ans{padding:0 .9rem .8rem}

/* cta block */
.cta-box{background:linear-gradient(140deg,var(--amber) 0%,#ffcb5e 100%);border-radius:16px;
  padding:1.4rem 1.3rem;text-align:center;margin:1.8rem 0;box-shadow:var(--shadow)}
.cta-box h2{color:#20140a;margin:.1rem 0 .3rem}
.cta-box p{color:#3a2a12;margin:.2rem auto .9rem;max-width:60ch}
.cta-btn{display:inline-block;background:var(--steel);color:#fff !important;font-weight:800;font-size:1.06rem;
  padding:.85rem 1.8rem;border-radius:10px;text-decoration:none}
.cta-btn:hover{background:#0e1826}
.disclaim{font-size:.78rem;color:#4a3818;margin-top:.7rem}

/* lightbox */
.lb{position:fixed;inset:0;background:rgba(9,13,20,.9);display:flex;align-items:center;justify-content:center;
  z-index:90;padding:20px}
.lb[hidden]{display:none}
.lb img{max-width:96%;max-height:92%;border-radius:10px}
.lb .x{position:absolute;top:14px;right:18px;color:#fff;font-size:2rem;background:none;border:none;cursor:pointer}

/* back to top */
#toTop{position:fixed;right:16px;bottom:16px;z-index:50;background:var(--steel);color:#fff;border:none;
  width:46px;height:46px;border-radius:50%;font-size:1.2rem;cursor:pointer;opacity:0;pointer-events:none;
  transition:opacity .2s;box-shadow:var(--shadow)}
#toTop.show{opacity:.92;pointer-events:auto}

/* footer */
.site-foot{background:var(--steel);color:#c6d0df;margin-top:2rem;padding:1.8rem 0 2.2rem;font-size:.92rem}
.foot-grid{display:flex;flex-wrap:wrap;gap:1.4rem;justify-content:space-between}
.site-foot h4{color:#fff;margin:.2rem 0 .5rem;font-size:1rem}
.site-foot a{color:#c6d0df;text-decoration:none;display:block;padding:.16rem 0}
.site-foot a:hover{color:#fff}
.foot-legal{border-top:1px solid rgba(255,255,255,.12);margin-top:1.3rem;padding-top:1rem;color:#93a1b5;font-size:.84rem}
.rg{display:inline-block;border:1px solid #93a1b5;border-radius:6px;padding:0 6px;font-weight:700;margin-right:6px}

@media (max-width:820px){
  body{font-size:16px}
  h1{font-size:1.7rem}
  h2{font-size:1.32rem}
  .grid2,.proscons{grid-template-columns:1fr}
  .burger{display:inline-flex}
  .nav-block{position:absolute;left:0;right:0;top:60px;background:var(--steel2);flex-direction:column;
    align-items:stretch;gap:0;margin:0;padding:0;display:none;box-shadow:0 12px 20px rgba(0,0,0,.3)}
  .nav-block.open{display:flex}
  .nav-main{flex-direction:column;align-items:stretch;gap:0;width:100%}
  .nav-main a{padding:.85rem 22px;border-bottom:1px solid rgba(255,255,255,.08);border-radius:0}
  .cta-top{margin:.7rem 22px 1rem;text-align:center}
  .head-row{position:relative}
}
@media (max-width:720px){
  .wrap{padding:0 22px}
}