/* ldplayer.io — fresh navy/indigo design. No external fonts or requests. */
:root{
  --primary:#2563eb; --primary-dark:#1d4ed8; --cyan:#06b6d4; --navy:#0b1220;
  --navy-2:#111c33; --panel:#16233f; --ink:#16233c; --muted:#5a6c8a;
  --line:#d9e2f2; --bg:#ffffff; --soft:#eef3fb; --soft-2:#e3ecfa;
  --radius:10px; --shadow:0 2px 5px rgba(11,18,32,.09),0 10px 24px rgba(11,18,32,.08);
  --shadow-lg:0 4px 8px rgba(11,18,32,.12),0 20px 44px rgba(11,18,32,.16);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.65;font-size:17px}
.wrap{max-width:1160px;margin:0 auto;padding:0 20px}
img{max-width:100%;height:auto;display:block}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3,h4{line-height:1.25;color:var(--navy);font-weight:750}
h2{font-size:1.72rem;margin-bottom:.55em}
h3{font-size:1.18rem;margin-bottom:.4em}
p{margin-bottom:1em}
.small{font-size:.86rem;color:var(--muted)}
.lead{font-size:1.16rem;color:#33456b}
section{padding:56px 0}
section.alt{background:var(--soft)}
section.darkband{background:var(--navy);color:#c9d7f2}
section.darkband h2,section.darkband h3{color:#fff}
section.darkband a{color:var(--cyan)}

/* header — dark sticky */
header.site-head{position:sticky;top:0;z-index:60;background:var(--navy);
  border-bottom:3px solid var(--primary);box-shadow:0 4px 18px rgba(11,18,32,.35)}
.nav{display:flex;align-items:center;gap:22px;min-height:66px}
.logo{display:flex;align-items:center;gap:11px;color:#fff;font-size:1.32rem;font-weight:800;letter-spacing:.2px}
.logo:hover{text-decoration:none}
.logo img{width:38px;height:38px}
.logo .dot{color:var(--cyan)}
.logo small{display:block;font-size:.62rem;font-weight:600;color:#8fa5c8;letter-spacing:1.6px;text-transform:uppercase;line-height:1}
nav#main-nav{display:flex;gap:4px;margin-left:auto}
nav#main-nav a{color:#dbe7ff;padding:9px 13px;border-radius:7px;font-weight:600;font-size:.98rem}
nav#main-nav a:hover{background:var(--navy-2);color:#fff;text-decoration:none}
.btn{display:inline-block;background:var(--primary);color:#fff;font-weight:700;
  padding:12px 24px;border-radius:var(--radius);border:2px solid var(--primary);cursor:pointer;font-size:1rem}
.btn:hover{background:var(--primary-dark);text-decoration:none}
.btn.cy{background:var(--cyan);border-color:var(--cyan);color:#04222b}
.btn.cy:hover{background:#0bb6dc}
.btn.ghost{background:transparent;color:#fff;border-color:#47608f}
.btn.ghost:hover{border-color:var(--cyan);color:#fff}
.btn.dark-ghost{background:transparent;color:var(--navy);border-color:var(--navy)}
.btn.sm{padding:8px 16px;font-size:.92rem}
.nav-cta{margin-left:8px;padding:9px 18px}
.nav-toggle{display:none;margin-left:auto;background:none;border:0;cursor:pointer;padding:10px}
.nav-toggle span{display:block;width:26px;height:3px;background:#fff;margin:5px 0;border-radius:2px}

/* hero — dark band, centred */
.hero{background:linear-gradient(180deg,#0b1220 0%,#0e1a36 78%,#123 130%);color:#dbe7ff;text-align:center;padding:64px 0 0}
.hero h1{color:#fff;font-size:2.65rem;max-width:820px;margin:0 auto .35em}
.hero h1 .hl{color:var(--cyan)}
.hero .tag{font-size:1.2rem;color:#a9bde0;max-width:720px;margin:0 auto 1.2em}
.hero .cta-row{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;margin-bottom:26px}
.trust-strip{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin:0 auto 34px;max-width:900px}
.trust-strip span{background:rgba(37,99,235,.16);border:1px solid #2c4a80;color:#cfe0ff;
  padding:7px 15px;border-radius:999px;font-size:.9rem;font-weight:600}
.hero-fig{max-width:1020px;margin:0 auto}
.hero-fig img{width:100%;border-radius:14px 14px 0 0;box-shadow:var(--shadow-lg)}
.hero-cap{font-size:.85rem;color:#7e93ba;padding:10px 0 22px}

/* generic blocks */
.crumbs{font-size:.88rem;color:var(--muted);padding-top:22px}
.crumbs a{color:var(--muted)}
.pagehead{padding:30px 0 6px}
.pagehead h1{font-size:2.25rem;margin-bottom:.35em;max-width:900px}
.byline{font-size:.9rem;color:var(--muted);margin-bottom:.4em}
figure.diagram{margin:22px 0}
figure.diagram img{width:100%;border-radius:var(--radius);box-shadow:var(--shadow)}
figcaption{font-size:.88rem;color:var(--muted);margin-top:8px;text-align:center}
img.featured{width:100%;border-radius:var(--radius);box-shadow:var(--shadow)}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:18px;margin:24px 0}
.grid.two{grid-template-columns:repeat(auto-fit,minmax(320px,1fr))}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:22px;box-shadow:var(--shadow)}
.card h3{margin-bottom:.35em}
.card p{margin-bottom:.4em;color:#33456b}
.card .ic{width:44px;height:44px;border-radius:9px;background:var(--soft-2);
  display:flex;align-items:center;justify-content:center;margin-bottom:12px}
.card .ic svg{width:26px;height:26px}
.step{display:flex;gap:16px;margin:0 0 20px}
.step .n{flex:0 0 44px;height:44px;border-radius:50%;background:var(--primary);color:#fff;
  font-weight:800;display:flex;align-items:center;justify-content:center;font-size:1.1rem}
.step h3{margin-bottom:.2em}
.def{background:var(--soft);border-left:5px solid var(--cyan);border-radius:0 var(--radius) var(--radius) 0;
  padding:20px 24px;margin:22px 0}
.def p:last-child{margin-bottom:0}
.warn{background:#fff8e8;border:1px solid #ecd9a0;border-left:5px solid #d9a404;border-radius:0 var(--radius) var(--radius) 0;padding:18px 22px;margin:22px 0}
table{width:100%;border-collapse:collapse;margin:20px 0;background:#fff;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
th,td{padding:11px 14px;text-align:left;border-bottom:1px solid var(--line);font-size:.97rem;vertical-align:top}
th{background:var(--navy);color:#fff;font-weight:700}
tr:last-child td{border-bottom:0}
.tbl-wrap{overflow-x:auto}
ul.clean,ol.clean{margin:0 0 1em 1.25em}
ul.clean li,ol.clean li{margin-bottom:.45em}
ul.no{list-style:none;margin-left:0}
ul.no li{padding-left:26px;position:relative}
ul.no li:before{content:"\00d7";position:absolute;left:4px;color:#c23333;font-weight:800}
ul.yes{list-style:none;margin-left:0}
ul.yes li{padding-left:26px;position:relative}
ul.yes li:before{content:"\2713";position:absolute;left:2px;color:var(--primary);font-weight:800}
.dl-box{background:var(--navy);color:#dbe7ff;border-radius:var(--radius);padding:30px;text-align:center;margin:26px 0}
.dl-box h2,.dl-box h3{color:#fff}
.dl-box .btn{margin:6px}
.cta-band{background:linear-gradient(90deg,var(--primary) 0%,#0e7490 100%);color:#eaf4ff;text-align:center;padding:44px 0}
.cta-band h2{color:#fff}
.cta-band .btn{background:#fff;color:var(--primary-dark);border-color:#fff}

/* TOC (home / review top strip) */
.toc{background:var(--soft);border:1px solid var(--line);border-radius:var(--radius);padding:18px 24px;margin:24px 0}
.toc h2,.toc h3{font-size:1rem;margin-bottom:.5em;text-transform:uppercase;letter-spacing:1px;color:var(--muted)}
.toc ol{margin-left:1.3em;columns:2;column-gap:36px}
.toc li{margin-bottom:.3em}

/* article layout — sticky left sidebar TOC */
.article-grid{display:grid;grid-template-columns:262px minmax(0,1fr);gap:34px;align-items:start;padding-bottom:10px}
.side-toc{position:sticky;top:92px;background:var(--soft);border:1px solid var(--line);
  border-radius:var(--radius);padding:18px 20px;font-size:.94rem}
.side-toc h2{font-size:.86rem;text-transform:uppercase;letter-spacing:1.2px;color:var(--muted);margin-bottom:.6em}
.side-toc ol{margin-left:1.15em}
.side-toc li{margin-bottom:.42em}
.side-toc .side-meta{border-top:1px solid var(--line);margin-top:14px;padding-top:12px;color:var(--muted);font-size:.85rem}
.article-body h2{margin-top:1.35em}
.article-body h2:first-of-type{margin-top:.4em}
.share{border-top:1px solid var(--line);margin-top:34px;padding-top:18px;font-size:.95rem}
.share a{display:inline-block;margin:0 10px 8px 0;font-weight:600}
.refs{background:var(--soft);border-radius:var(--radius);padding:20px 24px;margin-top:28px}
.refs h2{font-size:1.05rem;margin-bottom:.5em}
.refs ul{margin-left:1.2em;margin-bottom:0}

/* FAQ accordion */
.faq details{background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  margin-bottom:12px;box-shadow:var(--shadow);overflow:hidden}
.faq summary{cursor:pointer;font-weight:700;color:var(--navy);padding:16px 20px;list-style:none;position:relative;padding-right:48px}
.faq summary::-webkit-details-marker{display:none}
.faq summary:after{content:"+";position:absolute;right:18px;top:12px;font-size:1.5rem;color:var(--primary);font-weight:400}
.faq details[open ] summary:after{content:"\2212"}
.faq .a{padding:0 20px 16px;color:#33456b}
.faq .a p:last-child{margin-bottom:0}
.faq details .a{display:none}
.faq details[open ] .a{display:block;animation:faqin .28s ease}
@keyframes faqin{from{opacity:0;transform:translateY(-4px)}to{opacity:1;transform:none}}

/* tool / planner */
.tool-box{background:var(--navy);border-radius:14px;padding:28px;color:#dbe7ff;box-shadow:var(--shadow-lg);margin:26px 0}
.tool-box h2,.tool-box h3{color:#fff}
.tool-box .sub{color:#a9bde0}
.planner{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:16px;margin:18px 0}
.planner label{display:block;font-size:.86rem;font-weight:700;color:#a9bde0;margin-bottom:6px;text-transform:uppercase;letter-spacing:.6px}
.planner select{width:100%;padding:12px;border-radius:8px;border:1px solid #2c4a80;background:var(--navy-2);color:#fff;font-size:1rem}
.planner .help{font-size:.82rem;color:#7e93ba;margin-top:6px;text-transform:none;letter-spacing:0;font-weight:400}
.plan-out{background:var(--navy-2);border:1px solid #2c4a80;border-radius:var(--radius);padding:20px 22px}
.plan-out h3{font-size:1.02rem;color:var(--cyan);text-transform:uppercase;letter-spacing:1px}
.plan-out ul{margin:0 0 0 1.2em}
.plan-out li{margin-bottom:.4em}
.tool-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:16px;margin-top:22px}
.info-card{background:var(--navy-2);border:1px solid #2c4a80;border-radius:var(--radius);padding:18px}
.info-card h3{font-size:.95rem;color:var(--cyan);text-transform:uppercase;letter-spacing:.8px}
.info-card p{margin:0;color:#dbe7ff}

/* score box (review) */
.score-box{display:grid;grid-template-columns:200px 1fr;gap:26px;align-items:center;background:var(--soft);
  border:1px solid var(--line);border-radius:var(--radius);padding:24px;margin:24px 0}
.score-big{text-align:center}
.score-big .num{font-size:3.4rem;font-weight:850;color:var(--primary);line-height:1}
.score-big .lbl{font-size:.85rem;color:var(--muted)}
.bar-row{display:grid;grid-template-columns:170px 1fr 44px;gap:12px;align-items:center;margin-bottom:9px;font-size:.95rem}
.bar{height:11px;background:#d7e2f5;border-radius:6px;overflow:hidden}
.bar i{display:block;height:100%;background:linear-gradient(90deg,var(--primary),var(--cyan))}

/* forms */
.form-box{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow);max-width:640px}
.form-box label{display:block;font-weight:700;margin:14px 0 6px}
.form-box input,.form-box textarea{width:100%;padding:12px;border:1px solid var(--line);border-radius:8px;font:inherit;background:var(--soft)}

/* footer — 4 columns, navy */
footer.site-foot{background:var(--navy);color:#a9bde0;margin-top:0;padding:52px 0 30px;border-top:4px solid var(--primary)}
footer.site-foot .cols{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.2fr;gap:30px;margin-bottom:28px}
footer.site-foot h4{color:#fff;font-size:1rem;margin-bottom:.7em}
footer.site-foot ul{list-style:none}
footer.site-foot li{margin-bottom:.5em}
footer.site-foot a{color:#a9bde0}
footer.site-foot a:hover{color:#fff}
footer.site-foot .brand p{font-size:.93rem;margin-top:10px}
footer.site-foot .foot-line{border-top:1px solid #22335a;padding-top:18px;font-size:.9rem}
footer.site-foot .indep{font-size:.88rem;color:#7e93ba;margin-top:8px}

#toTop{position:fixed;right:20px;bottom:20px;width:46px;height:46px;border-radius:50%;
  background:var(--primary);color:#fff;border:0;cursor:pointer;opacity:0;pointer-events:none;
  transition:opacity .25s;box-shadow:var(--shadow-lg);z-index:70;font-size:1.15rem}
#toTop.show{opacity:1;pointer-events:auto}
.js .reveal{opacity:0;transform:translateY(14px);transition:opacity .5s ease,transform .5s ease}
.js .reveal.in{opacity:1;transform:none}

/* responsive */
@media(max-width:920px){
  .article-grid{grid-template-columns:1fr}
  .side-toc{position:static;order:-1}
  footer.site-foot .cols{grid-template-columns:1fr 1fr}
  .score-box{grid-template-columns:1fr}
}
@media(max-width:760px){
  body{font-size:16px}
  .nav-toggle{display:block}
  nav#main-nav{display:none;position:absolute;top:66px;left:0;right:0;background:var(--navy);
    flex-direction:column;padding:12px 20px 18px;border-bottom:3px solid var(--primary)}
  nav#main-nav.open{display:flex}
  nav#main-nav a{padding:11px 8px}
  .nav-cta{display:none}
  .hero h1{font-size:2rem}
  .pagehead h1{font-size:1.8rem}
  section{padding:42px 0}
  .toc ol{columns:1}
  .bar-row{grid-template-columns:120px 1fr 40px}
}