:root{
  --blue:#0052cc;
  --blue-dark:#003d99;
  --blue-darker:#0f2440;
  --blue-light:#e8f0fe;
  --blue-soft:#d6e4fb;
  --ink:#16233a;
  --text:#334155;
  --muted:#64748b;
  --bg:#ffffff;
  --bg-alt:#f5f8fc;
  --bg-alt2:#eef4fb;
  --border:#e6edf5;
  --border-soft:#eef2f8;
  --green:#16a34a;
  --amber:#d97706;
  --red:#dc2626;
  --radius:14px;
  --radius-sm:8px;
  --shadow-sm:0 1px 3px rgba(15,36,64,.06);
  --shadow:0 4px 18px rgba(15,36,64,.08);
  --shadow-md:0 10px 34px rgba(15,36,64,.10);
  --maxw:1180px;
}
.entry-hero-layout-fullwidth {padding:0}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;color:var(--text);background:var(--bg);line-height:1.7;-webkit-font-smoothing:antialiased;font-size:16px}
img,svg{max-width:100%}
a{color:var(--blue);text-decoration:none}
a:hover{color:var(--blue-dark)}
.container{max-width:var(--maxw);margin:0 auto;padding:0 24px}
section{padding:72px 0}
section.alt{background:var(--bg-alt)}
h1,h2,h3,h4{color:var(--ink);line-height:1.25;font-weight:700}
h2{font-size:clamp(24px,3.4vw,33px);margin-bottom:14px;letter-spacing:-.4px}
h3{font-size:20px;margin:26px 0 10px}
p{margin-bottom:14px}
ul,ol{margin:0 0 16px 22px}
li{margin-bottom:6px}
strong{color:var(--ink)}

/* ---- Hero ---- */
.hero{background:linear-gradient(180deg,#ffffff 0%,#eef4fb 100%);border-bottom:1px solid var(--border);padding:64px 0 56px;position:relative;overflow:hidden}
.hero::before{content:'';position:absolute;inset:0;background:radial-gradient(700px 360px at 85% 0%,rgba(0,82,204,.07),transparent 60%);pointer-events:none}
.hero .container{position:relative}
.breadcrumb{font-size:13px;color:var(--muted);margin-bottom:18px}
.breadcrumb a{color:var(--muted)}
.breadcrumb a:hover{color:var(--blue)}
.hero-badge{display:inline-flex;align-items:center;gap:8px;font-size:12.5px;font-weight:600;color:var(--blue);background:var(--blue-light);border:1px solid var(--blue-soft);padding:6px 14px;border-radius:20px;margin-bottom:18px;letter-spacing:.3px}
.hero h1{font-size:clamp(30px,5vw,50px);font-weight:800;letter-spacing:-1px;margin-bottom:16px;max-width:880px}
.hero h1 em{font-style:normal;color:var(--blue)}
.hero-sub{font-size:17px;color:var(--text);max-width:720px;margin-bottom:26px}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;align-items:center}
.hero-meta{display:flex;gap:22px;flex-wrap:wrap;margin-top:26px;font-size:13px;color:var(--muted)}
.hero-meta span{display:inline-flex;align-items:center;gap:7px}
.hero-meta b{color:var(--ink);font-weight:600}

/* ---- Buttons ---- */
.btn{display:inline-flex;align-items:center;gap:8px;padding:13px 26px;border-radius:var(--radius-sm);font-size:14.5px;font-weight:600;transition:all .2s ease;cursor:pointer;border:1.5px solid transparent}
.btn-primary{background:var(--blue);color:#fff;box-shadow:0 4px 14px rgba(0,82,204,.22)}
.btn-primary:hover{background:var(--blue-dark);color:#fff;transform:translateY(-1px);box-shadow:0 6px 20px rgba(0,82,204,.3)}
.btn-outline{background:#fff;color:var(--blue);border-color:var(--blue)}
.btn-outline:hover{background:var(--blue-light);color:var(--blue-dark)}
.btn-lg{padding:15px 32px;font-size:15px}

/* ---- Section label ---- */
.sec-label{display:inline-flex;align-items:center;gap:8px;font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:2px;color:var(--blue);margin-bottom:10px}
.sec-label::before{content:'';width:20px;height:2px;background:var(--blue);border-radius:1px}
.sec-sub{font-size:15.5px;color:var(--muted);max-width:760px;margin-bottom:26px}

/* ---- Quick Answer ---- */
.quick{background:var(--blue-light);border:1px solid var(--blue-soft);border-left:4px solid var(--blue);border-radius:var(--radius);padding:22px 24px;margin:8px 0 6px}
.quick .q-label{font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:1.5px;color:var(--blue);margin-bottom:8px;display:flex;align-items:center;gap:8px}
.quick p{margin:0;font-size:15.5px;color:var(--ink)}

/* ---- Cards / Grids ---- */
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:22px}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow-sm);transition:all .25s ease}
.card:hover{box-shadow:var(--shadow);transform:translateY(-3px)}
.card h4{font-size:16px;margin-bottom:8px;display:flex;align-items:center;gap:9px}
.card p{font-size:14px;color:var(--text);margin:0}
.card .ic{width:34px;height:34px;min-width:34px;border-radius:9px;background:var(--blue-light);display:flex;align-items:center;justify-content:center;color:var(--blue);font-weight:700;font-size:15px}

/* ---- Tables ---- */
.table-wrap{overflow-x:auto;border:1px solid var(--border);border-radius:var(--radius);margin:18px 0;box-shadow:var(--shadow-sm)}
table{width:100%;border-collapse:collapse;font-size:14px;min-width:480px}
thead th{background:var(--blue);color:#fff;text-align:left;padding:13px 16px;font-weight:600;font-size:12.5px;text-transform:uppercase;letter-spacing:.6px}
tbody td{padding:12px 16px;border-bottom:1px solid var(--border-soft);color:var(--text)}
tbody tr:nth-child(even){background:var(--bg-alt)}
tbody tr:hover{background:var(--blue-light)}
td .yes{color:var(--green);font-weight:700}
td .no{color:var(--red);font-weight:700}
.mat-tag{display:inline-block;font-size:11px;font-weight:700;padding:3px 9px;border-radius:20px;background:var(--blue-light);color:var(--blue);margin-right:4px}

/* ---- Code / formula blocks ---- */
.code{position:relative;background:#f4f7fb;border:1px solid var(--border);border-radius:var(--radius-sm);margin:16px 0;overflow:hidden}
.code-bar{display:flex;align-items:center;justify-content:space-between;background:#eaf0f8;padding:7px 14px;font-size:12px;color:var(--muted);border-bottom:1px solid var(--border)}
.code-bar .lang{font-weight:600;color:var(--blue);letter-spacing:.5px}
.code-bar button{background:#fff;border:1px solid var(--border);color:var(--blue);font-size:12px;font-weight:600;padding:4px 12px;border-radius:6px;cursor:pointer;transition:all .15s}
.code-bar button:hover{background:var(--blue-light)}
.code pre{margin:0;padding:16px 18px;overflow-x:auto;font-family:'SFMono-Regular',Consolas,'Liberation Mono',Menlo,monospace;font-size:14px;line-height:1.65;color:#16233a}
.formula{background:var(--blue-light);border:1px solid var(--blue-soft);border-radius:var(--radius-sm);padding:18px 22px;margin:16px 0;text-align:center}
.formula .f-main{font-family:'SFMono-Regular',Consolas,monospace;font-size:18px;color:var(--ink);font-weight:700;letter-spacing:.5px}
.formula .f-note{font-size:13px;color:var(--muted);margin-top:6px}

/* ---- Diagram block ---- */
.diagram{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:22px;margin:16px 0;box-shadow:var(--shadow-sm);text-align:center}
.diagram svg{display:block;margin:0 auto}
.diagram .cap{font-size:13px;color:var(--muted);margin-top:10px}
.diagram-row{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
@media(max-width:760px){.diagram-row{grid-template-columns:1fr}}

/* ---- Callout ---- */
.note{display:flex;gap:12px;background:var(--bg-alt);border:1px solid var(--border);border-left:4px solid var(--blue);border-radius:var(--radius-sm);padding:16px 18px;margin:16px 0;font-size:14.5px}
.note .n-ic{width:26px;height:26px;min-width:26px;border-radius:50%;background:var(--blue);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:14px;margin-top:1px}
.note.warn{border-left-color:var(--amber);background:#fffbeb}
.note.warn .n-ic{background:var(--amber)}
.note.danger{border-left-color:var(--red);background:#fef2f2}
.note.danger .n-ic{background:var(--red)}

/* ---- Hub nav ---- */
.hub{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:22px 24px;margin:8px 0;box-shadow:var(--shadow-sm)}
.hub h4{font-size:15px;margin-bottom:14px}
.hub-group{font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:1px;color:var(--muted);margin:14px 0 8px}
.hub-list{display:flex;flex-wrap:wrap;gap:9px}
.hub-list a,.hub-list span{font-size:13px;background:var(--bg-alt);border:1px solid var(--border);color:var(--text);padding:7px 14px;border-radius:20px}
.hub-list a:hover{background:var(--blue-light);color:var(--blue)}
.hub-list span.cur{background:var(--blue);color:#fff;border-color:var(--blue);font-weight:600}
.hub-list span.soon{color:var(--muted);font-style:italic}

/* ---- Decision tree ---- */
.dtree{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:18px 0}
@media(max-width:760px){.dtree{grid-template-columns:1fr}}
.dnode{background:#fff;border:1px solid var(--border);border-radius:var(--radius-sm);padding:16px 18px;box-shadow:var(--shadow-sm);border-top:3px solid var(--blue)}
.dnode .sym{font-weight:700;color:var(--red);font-size:13px;text-transform:uppercase;letter-spacing:.5px}
.dnode .adj{margin-top:8px;font-size:13.5px;color:var(--green);font-weight:600}
.dnode .why{font-size:13px;color:var(--muted);margin-top:4px}
.dnode.at{font-size:15px;color:var(--ink);font-weight:700;border-top-color:var(--amber)}

/* ---- Calculator ---- */
.calc{background:linear-gradient(180deg,#ffffff,#f5f8fc);border:1px solid var(--border);border-radius:var(--radius);padding:28px;margin:18px 0;box-shadow:var(--shadow)}
.calc-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px}
@media(max-width:760px){.calc-grid{grid-template-columns:1fr}}
.calc h3{margin-top:0}
.calc label{display:block;font-size:13px;font-weight:600;color:var(--ink);margin:14px 0 6px}
.calc select,.calc input{width:100%;padding:11px 13px;border:1.5px solid var(--border);border-radius:var(--radius-sm);font-size:14px;font-family:inherit;color:var(--ink);background:#fff;transition:border-color .15s}
.calc select:focus,.calc input:focus{outline:none;border-color:var(--blue)}
.calc-row{display:flex;gap:12px}
.calc-row>div{flex:1}
.calc-out{background:#fff;border:1px solid var(--border);border-radius:var(--radius-sm);padding:20px;display:flex;flex-direction:column;justify-content:center}
.calc-out .o-item{padding:14px 0;border-bottom:1px solid var(--border-soft)}
.calc-out .o-item:last-child{border-bottom:none}
.calc-out .o-lbl{font-size:12.5px;color:var(--muted);text-transform:uppercase;letter-spacing:.6px}
.calc-out .o-val{font-size:30px;font-weight:800;color:var(--blue);letter-spacing:-.5px}
.calc-out .o-val small{font-size:14px;font-weight:600;color:var(--muted)}
.calc-out .o-sub{font-size:12.5px;color:var(--muted);margin-top:2px}
.calc .reset{margin-top:14px;background:var(--bg-alt);border:1px solid var(--border);color:var(--ink);font-size:13px;padding:9px 16px;border-radius:var(--radius-sm);cursor:pointer;font-weight:600}
.calc .reset:hover{background:var(--blue-light)}

/* ---- FAQ ---- */
.faq-item{border:1px solid var(--border);border-radius:var(--radius-sm);margin-bottom:10px;overflow:hidden;background:#fff}
.faq-q{padding:16px 20px;font-size:15.5px;font-weight:600;color:var(--ink);cursor:pointer;display:flex;justify-content:space-between;align-items:center;gap:14px;user-select:none}
.faq-q:hover{background:var(--bg-alt)}
.faq-q .plus{font-size:20px;color:var(--blue);transition:transform .25s;font-weight:400}
.faq-q.open .plus{transform:rotate(45deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .35s ease;padding:0 20px;font-size:14.5px;color:var(--text)}
.faq-a.open{max-height:340px;padding:0 20px 16px}

/* ---- CTA ---- */
.cta{background:linear-gradient(135deg,#0052cc 0%,#003d99 100%);color:#fff;border-radius:var(--radius);padding:42px 36px;text-align:center;box-shadow:var(--shadow-md)}
.cta h2{color:#fff;margin-bottom:10px}
.cta p{color:rgba(255,255,255,.88);max-width:620px;margin:0 auto 22px;font-size:15.5px}
.cta .btn-white{background:#fff;color:var(--blue);font-weight:700}
.cta .btn-white:hover{background:#eef4fb}
.cta ul{list-style:none;margin:18px auto 24px;max-width:680px;display:flex;flex-wrap:wrap;gap:10px 22px;justify-content:center}
.cta ul li{font-size:14px;color:#fff;display:flex;align-items:center;gap:8px;margin:0}
.cta ul li::before{content:'';width:16px;height:16px;border-radius:50%;background:rgba(255,255,255,.22);background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M5 8l2 2 4-4' stroke='white' stroke-width='2' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");background-size:12px;background-position:center;background-repeat:no-repeat}

/* ---- TOC ---- */
.toc{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:20px 22px;margin:8px 0 6px;box-shadow:var(--shadow-sm)}
.toc h4{font-size:14px;margin-bottom:12px;color:var(--ink)}
.toc a{display:block;font-size:14px;color:var(--text);padding:5px 0;border-bottom:1px solid var(--border-soft)}
.toc a:last-child{border-bottom:none}
.toc a:hover{color:var(--blue);padding-left:4px}

/* ---- Reveal ---- */
.reveal{opacity:0;transform:translateY(18px);transition:opacity .6s ease,transform .6s ease}
.reveal.in{opacity:1;transform:none}

@media(max-width:900px){.grid-2,.grid-3{grid-template-columns:1fr}}
@media(max-width:768px){section{padding:52px 0}.hero{padding:46px 0 40px}h2{font-size:24px}.cta{padding:32px 22px}}