/* ============================================================
   The Agent Brief — core stylesheet
   Static, dependency-free, mobile-first.
   ============================================================ */

:root{
  --ink:#0b1220;
  --ink-2:#1e293b;
  --body:#3b4759;
  --muted:#64748b;
  --accent:#1d4ed8;
  --accent-dark:#1e3a8a;
  --accent-soft:#eef4ff;
  --teal:#0f766e;
  --teal-soft:#ecfdf5;
  --amber:#b45309;
  --amber-soft:#fffbeb;
  --bg:#ffffff;
  --bg-soft:#f7f8fb;
  --bg-deep:#0b1220;
  --border:#e4e8ef;
  --border-strong:#cbd5e1;
  --shadow-sm:0 1px 2px rgba(11,18,32,.05);
  --shadow-md:0 10px 30px -12px rgba(11,18,32,.18);
  --radius:14px;
  --radius-sm:9px;
  --wrap:1180px;
  --font-sans:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --font-serif:Georgia,Cambria,"Times New Roman",Times,serif;
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;
  font-family:var(--font-sans);
  font-size:17px;
  line-height:1.7;
  color:var(--body);
  background:var(--bg);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
img,svg{max-width:100%;height:auto;display:block}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline;text-underline-offset:3px}
h1,h2,h3,h4{color:var(--ink);line-height:1.18;margin:0 0 .6em;letter-spacing:-.02em}
h1{font-family:var(--font-serif);font-weight:700}
h2{font-family:var(--font-serif);font-weight:700}
h3,h4{font-family:var(--font-sans);font-weight:700;letter-spacing:-.01em}
p{margin:0 0 1.15em}
ul,ol{margin:0 0 1.3em;padding-left:1.35em}
li{margin-bottom:.5em}
strong{color:var(--ink-2)}
hr{border:0;border-top:1px solid var(--border);margin:2.5rem 0}
::selection{background:#dbeafe;color:var(--ink)}

.wrap{width:100%;max-width:var(--wrap);margin:0 auto;padding:0 22px}
.narrow{max-width:820px}
.center{text-align:center}
.mt-0{margin-top:0}
.mb-0{margin-bottom:0}

.skip{
  position:absolute;left:-9999px;top:0;z-index:200;
  background:var(--ink);color:#fff;padding:12px 18px;border-radius:0 0 8px 0;
}
.skip:focus{left:0}

/* ---------- Header ---------- */
.site-header{
  position:sticky;top:0;z-index:90;
  background:rgba(255,255,255,.92);
  backdrop-filter:saturate(180%) blur(12px);
  border-bottom:1px solid var(--border);
}
.header-inner{display:flex;align-items:center;gap:28px;min-height:68px}
.brand{display:inline-flex;align-items:center;gap:10px;font-weight:800;color:var(--ink);font-size:1.06rem;letter-spacing:-.02em;white-space:nowrap}
.brand:hover{text-decoration:none}
.brand-mark{width:32px;height:32px;flex:0 0 32px}
.brand small{display:block;font-size:.62rem;font-weight:600;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);line-height:1}
.nav{display:flex;align-items:center;gap:6px;margin-left:auto}
.nav a{
  color:var(--ink-2);font-size:.93rem;font-weight:600;padding:9px 12px;border-radius:8px;
}
.nav a:hover{background:var(--bg-soft);color:var(--ink);text-decoration:none}
.nav a[aria-current="page"]{color:var(--accent);background:var(--accent-soft)}
.nav .btn{margin-left:8px;color:var(--bg-soft);}
.nav-toggle{
  display:none;margin-left:auto;background:#fff;border:1px solid var(--border);
  border-radius:8px;padding:9px 12px;font:600 .9rem var(--font-sans);color:var(--ink);cursor:pointer;
}

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  background:var(--ink);color:#fff;font-weight:700;font-size:.95rem;
  padding:12px 20px;border-radius:10px;border:1px solid var(--ink);
  transition:transform .15s ease,background .15s ease;
}
.btn:hover{background:#182338;text-decoration:none;transform:translateY(-1px)}
.btn-accent{background:var(--accent);border-color:var(--accent)}
.btn-accent:hover{background:var(--accent-dark);border-color:var(--accent-dark)}
.btn-ghost{background:transparent;color:var(--ink);border-color:var(--border-strong)}
.btn-ghost:hover{background:var(--bg-soft)}
.btn-sm{padding:9px 15px;font-size:.88rem;border-radius:8px}

/* ---------- Hero ---------- */
.hero{
  position:relative;overflow:hidden;
  background:
    radial-gradient(900px 380px at 82% -8%,rgba(29,78,216,.10),transparent 70%),
    radial-gradient(600px 300px at 8% 0%,rgba(15,118,110,.08),transparent 70%),
    linear-gradient(180deg,#fbfcff 0%,#ffffff 100%);
  border-bottom:1px solid var(--border);
}
.hero::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:linear-gradient(to right,rgba(11,18,32,.035) 1px,transparent 1px),
                   linear-gradient(to bottom,rgba(11,18,32,.035) 1px,transparent 1px);
  background-size:56px 56px;
  mask-image:linear-gradient(to bottom,rgba(0,0,0,.55),transparent 72%);
  -webkit-mask-image:linear-gradient(to bottom,rgba(0,0,0,.55),transparent 72%);
}
.hero-inner{position:relative;z-index:1;padding:74px 0 56px;display:grid;grid-template-columns:1.35fr .85fr;gap:52px;align-items:center}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:.74rem;font-weight:800;letter-spacing:.13em;text-transform:uppercase;
  color:var(--teal);background:var(--teal-soft);border:1px solid #c6f0e2;
  padding:7px 12px;border-radius:999px;margin-bottom:20px;
}
.eyebrow .dot{width:6px;height:6px;border-radius:50%;background:var(--teal)}
.hero h1{font-size:clamp(2.25rem,4.4vw,3.55rem);margin-bottom:20px;letter-spacing:-.03em}
.hero h1 em{font-style:normal;color:var(--accent);position:relative;white-space:nowrap}
.hero h1 em::after{
  content:"";position:absolute;left:0;right:0;bottom:.06em;height:.22em;
  background:rgba(29,78,216,.14);z-index:-1;border-radius:2px;
}
.hero-deck{font-size:1.16rem;line-height:1.65;max-width:600px;margin-bottom:26px;color:#42506a}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:22px}
.hero-note{font-size:.85rem;color:var(--muted);display:flex;align-items:center;gap:8px}
.hero-note svg{width:16px;height:16px;flex:0 0 16px}

/* hero side card */
.hero-card{
  background:#fff;border:1px solid var(--border);border-radius:18px;
  box-shadow:var(--shadow-md);padding:24px 24px 20px;position:relative;
}
.hero-card::before{
  content:"";position:absolute;top:-1px;left:24px;right:24px;height:3px;
  background:linear-gradient(90deg,var(--accent),var(--teal));border-radius:0 0 3px 3px;
}
.hero-card h2{font-family:var(--font-sans);font-size:.76rem;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin-bottom:16px}
.metric{display:flex;align-items:baseline;justify-content:space-between;gap:16px;padding:12px 0;border-bottom:1px solid var(--border)}
.metric:last-child{border-bottom:0;padding-bottom:0}
.metric b{font-family:var(--font-serif);font-size:1.72rem;color:var(--ink);line-height:1}
.metric span{font-size:.82rem;color:var(--muted);text-align:right;max-width:170px;line-height:1.35}
.hero-card .src{font-size:.7rem;color:#94a3b8;margin-top:14px;margin-bottom:0;line-height:1.4}

/* ---------- Stats strip ---------- */
.stats-strip{border-bottom:1px solid var(--border);background:#fff}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:0;padding:26px 0}
.stat{padding:0 22px;border-right:1px solid var(--border)}
.stat:first-child{padding-left:0}
.stat:last-child{border-right:0}
.stat b{display:block;font-family:var(--font-serif);font-size:1.65rem;color:var(--ink);line-height:1.1;margin-bottom:5px}
.stat span{font-size:.82rem;color:var(--muted);line-height:1.4;display:block}
.stat a{font-size:.75rem;color:#94a3b8}

/* ---------- Sections ---------- */
.section{padding:68px 0}
.section-soft{background:var(--bg-soft);border-top:1px solid var(--border);border-bottom:1px solid var(--border)}
.section-head{max-width:720px;margin-bottom:34px}
.section-head.center{margin-left:auto;margin-right:auto}
.kicker{font-size:.74rem;font-weight:800;letter-spacing:.13em;text-transform:uppercase;color:var(--accent);margin-bottom:10px;display:block}
.section-head h2{font-size:clamp(1.7rem,2.8vw,2.3rem);margin-bottom:10px}
.section-head p{font-size:1.02rem;color:var(--muted);margin:0}

.grid{display:grid;gap:20px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}

.card{
  display:flex;flex-direction:column;
  background:#fff;border:1px solid var(--border);border-radius:var(--radius);
  padding:24px;box-shadow:var(--shadow-sm);
  transition:border-color .18s ease,transform .18s ease,box-shadow .18s ease;
}
.card:hover{border-color:#c7d2fe;transform:translateY(-2px);box-shadow:var(--shadow-md)}
.card-tag{font-size:.68rem;font-weight:800;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);margin-bottom:10px}
.card h3{font-size:1.12rem;margin-bottom:8px;letter-spacing:-.015em}
.card h3 a{color:var(--ink)}
.card h3 a:hover{color:var(--accent);text-decoration:none}
.card p{font-size:.93rem;color:var(--muted);margin-bottom:16px}
.card .more{margin-top:auto;font-size:.86rem;font-weight:700;color:var(--accent)}
.card .more::after{content:" →"}
a.card{color:inherit}
a.card:hover{text-decoration:none}

.card-num{
  width:34px;height:34px;border-radius:9px;background:var(--accent-soft);color:var(--accent);
  display:inline-flex;align-items:center;justify-content:center;font-weight:800;font-size:.9rem;margin-bottom:14px;
}
.card-num.teal{background:var(--teal-soft);color:var(--teal)}
.card-num.amber{background:var(--amber-soft);color:var(--amber)}

/* featured / wide card */
.feature-grid{display:grid;grid-template-columns:1.25fr .75fr;gap:20px}
.feature{
  background:linear-gradient(135deg,#0b1220 0%,#16233d 62%,#1b2f56 100%);
  color:#cbd5e1;border-radius:18px;padding:38px;position:relative;overflow:hidden;
  display:flex;flex-direction:column;justify-content:space-between;min-height:320px;
}
.feature::after{
  content:"";position:absolute;right:-90px;top:-90px;width:320px;height:320px;border-radius:50%;
  background:radial-gradient(circle,rgba(59,130,246,.38),transparent 68%);
}
.feature .eyebrow{background:rgba(255,255,255,.08);border-color:rgba(255,255,255,.16);color:#93c5fd}
.feature h3{color:#fff;font-family:var(--font-serif);font-size:1.9rem;max-width:460px;line-height:1.2;margin-bottom:12px}
.feature p{color:#a9b8ce;max-width:470px;font-size:.98rem}
.feature .more{color:#93c5fd;font-weight:700;font-size:.9rem;margin-top:18px;position:relative;z-index:1}
.feature a{position:relative;z-index:1}
.feature a:hover{text-decoration:none}

/* list rows */
.rows{border-top:1px solid var(--border)}
.row{
  display:grid;grid-template-columns:44px 1fr auto;gap:18px;align-items:center;
  padding:20px 0;border-bottom:1px solid var(--border);
}
.row .n{font-family:var(--font-serif);font-size:1.1rem;color:#94a3b8}
.row h3{font-size:1.04rem;margin:0 0 3px}
.row h3 a{color:var(--ink)}
.row h3 a:hover{color:var(--accent);text-decoration:none}
.row p{font-size:.86rem;color:var(--muted);margin:0}
.row .tag{font-size:.7rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--accent);background:var(--accent-soft);padding:5px 9px;border-radius:6px;white-space:nowrap}

/* ---------- Article ---------- */
.breadcrumbs{font-size:.8rem;color:var(--muted);padding:18px 0 0}
.breadcrumbs ol{list-style:none;display:flex;flex-wrap:wrap;gap:7px;margin:0;padding:0}
.breadcrumbs li{display:flex;align-items:center;gap:7px;margin:0}
.breadcrumbs li+li::before{content:"/";color:#cbd5e1}
.breadcrumbs a{color:var(--muted)}
.breadcrumbs a:hover{color:var(--accent)}
.breadcrumbs [aria-current]{color:var(--ink-2);font-weight:600}

.article{padding:26px 0 64px}
.article-head{max-width:820px;margin-bottom:34px}
.article-head h1{font-size:clamp(2.05rem,3.9vw,3.05rem);margin-bottom:16px;letter-spacing:-.03em}
.article-head .dek{font-size:1.13rem;color:#4a5870;line-height:1.65;margin-bottom:22px}
.article-meta{display:flex;flex-wrap:wrap;align-items:center;gap:8px 18px;font-size:.83rem;color:var(--muted);border-top:1px solid var(--border);padding-top:16px}
.article-meta .author{display:inline-flex;align-items:center;gap:8px;color:var(--ink-2);font-weight:600}
.avatar{width:26px;height:26px;border-radius:50%;background:linear-gradient(135deg,var(--accent),var(--teal));color:#fff;display:inline-flex;align-items:center;justify-content:center;font-size:.66rem;font-weight:800;font-family:var(--font-sans)}
.article-meta .dot-sep{width:3px;height:3px;border-radius:50%;background:#cbd5e1}

.article-grid{display:grid;grid-template-columns:minmax(0,760px) 300px;gap:52px;align-items:start}

.prose{font-size:1.04rem;line-height:1.78;color:var(--body);min-width:0}
.prose>h2{font-size:clamp(1.45rem,2.3vw,1.85rem);margin:2.2em 0 .65em;scroll-margin-top:96px}
.prose>h3{font-size:1.16rem;margin:1.9em 0 .5em;scroll-margin-top:96px}
.prose>h2:first-child,.prose>h3:first-child{margin-top:0}
.prose p{margin-bottom:1.25em}
.prose a{font-weight:600;text-decoration:underline;text-decoration-color:#bfd3ff;text-underline-offset:3px}
.prose a:hover{text-decoration-color:var(--accent)}
.prose ul,.prose ol{margin-bottom:1.4em}
.prose li{margin-bottom:.55em}
.prose li::marker{color:#94a3b8}
.prose blockquote{
  margin:1.8em 0;padding:20px 24px;border-left:3px solid var(--accent);
  background:var(--accent-soft);border-radius:0 10px 10px 0;color:var(--ink-2);font-size:1rem;
}
.prose blockquote p:last-child{margin-bottom:0}
.prose code{background:#f1f5f9;border:1px solid var(--border);border-radius:5px;padding:2px 6px;font-size:.88em;color:#0f172a}
.prose img{border-radius:12px;border:1px solid var(--border);margin:1.8em 0}
.prose figure{margin:2em 0}
.prose figcaption{font-size:.8rem;color:var(--muted);margin-top:8px;text-align:center}

.key-takeaways{
  background:#fff;border:1px solid var(--border);border-left:4px solid var(--teal);
  border-radius:10px;padding:22px 24px;margin:0 0 2em;box-shadow:var(--shadow-sm);
}
.key-takeaways h2,.key-takeaways h3{font-family:var(--font-sans);font-size:.78rem;letter-spacing:.11em;text-transform:uppercase;color:var(--teal);margin:0 0 12px}
.key-takeaways ul{margin:0;padding-left:1.15em}
.key-takeaways li{font-size:.95rem;color:var(--ink-2);margin-bottom:.45em}
.key-takeaways li:last-child{margin-bottom:0}

.answer-box{
  background:var(--bg-soft);border:1px solid var(--border);border-radius:12px;
  padding:22px 24px;margin:0 0 2em;
}
.answer-box .label{font-size:.7rem;font-weight:800;letter-spacing:.11em;text-transform:uppercase;color:var(--muted);display:block;margin-bottom:8px}
.answer-box p{font-size:1.02rem;color:var(--ink-2);margin:0;line-height:1.65}

.callout{
  border-radius:12px;padding:20px 22px;margin:1.9em 0;font-size:.96rem;
  background:var(--amber-soft);border:1px solid #fde68a;color:#78350f;
}
.callout strong{color:#78350f}
.callout.teal{background:var(--teal-soft);border-color:#bbf7d0;color:#134e4a}
.callout.blue{background:var(--accent-soft);border-color:#c7d2fe;color:#1e3a8a}
.callout p:last-child{margin-bottom:0}
.callout .callout-title{display:block;font-weight:800;margin-bottom:6px;font-size:.82rem;letter-spacing:.06em;text-transform:uppercase}

.table-wrap{overflow-x:auto;margin:1.9em 0;border:1px solid var(--border);border-radius:12px}
table{width:100%;border-collapse:collapse;font-size:.9rem;background:#fff}
caption{text-align:left;font-size:.8rem;color:var(--muted);padding:12px 16px;border-bottom:1px solid var(--border);background:var(--bg-soft)}
th,td{padding:13px 15px;text-align:left;vertical-align:top;border-bottom:1px solid var(--border)}
th{background:var(--bg-soft);font-size:.75rem;letter-spacing:.06em;text-transform:uppercase;color:var(--ink-2);font-weight:800;white-space:nowrap}
tr:last-child td{border-bottom:0}
tbody tr:hover{background:#fafbff}
td strong{color:var(--ink)}

.source-note{font-size:.78rem;color:var(--muted);line-height:1.5;margin-top:-.6em;margin-bottom:1.8em}
.source-note a{font-weight:500}

/* TOC sidebar */
.sidebar{position:sticky;top:92px;display:flex;flex-direction:column;gap:22px}
.toc{
  background:#fff;border:1px solid var(--border);border-radius:12px;padding:20px;
  max-height:calc(100vh - 140px);overflow:auto;
}
.toc h2{font-family:var(--font-sans);font-size:.72rem;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin:0 0 12px}
.toc ol{list-style:none;margin:0;padding:0;counter-reset:toc}
.toc li{margin:0;counter-increment:toc}
.toc a{display:block;font-size:.86rem;color:#526175;padding:6px 0 6px 14px;border-left:2px solid var(--border);line-height:1.4}
.toc a:hover{color:var(--accent);border-left-color:#bfd3ff;text-decoration:none}
.toc a.active{color:var(--accent);border-left-color:var(--accent);font-weight:700}
.sidebar-cta{background:var(--ink);color:#cbd5e1;border-radius:12px;padding:22px}
.sidebar-cta h2{color:#fff;font-family:var(--font-sans);font-size:1rem;margin-bottom:8px}
.sidebar-cta p{font-size:.84rem;color:#a9b8ce;margin-bottom:14px}
.sidebar-cta .btn{width:100%;font-size:.86rem;padding:10px 14px}

.author-box{
  display:flex;gap:16px;align-items:flex-start;background:#fff;border:1px solid var(--border);
  border-radius:12px;padding:20px;margin-top:2.6em;
}
.author-box .avatar{width:46px;height:46px;flex:0 0 46px;font-size:.9rem}
.author-box p{font-size:.84rem;color:var(--muted);margin:0;line-height:1.55}
.author-box b{color:var(--ink);display:block;font-size:.94rem;margin-bottom:2px}

.related{margin-top:3em;border-top:1px solid var(--border);padding-top:2em}
.related h2{font-size:1.3rem;margin-bottom:18px}

/* ---------- Ad slots ---------- */
.ad-slot{
  margin:2.2em 0;padding:10px;background:#fbfcfe;border:1px dashed #d6dee9;border-radius:10px;
  text-align:center;position:relative;min-height:100px;display:flex;flex-direction:column;
  align-items:center;justify-content:center;gap:6px;
}
.ad-slot::before{
  content:"Advertisement";font-size:.62rem;font-weight:800;letter-spacing:.16em;
  text-transform:uppercase;color:#94a3b8;
}
.ad-slot .ad-fallback{font-size:.76rem;color:#b6c2d2;line-height:1.4}
.ad-slot[data-ad-slot="leaderboard"]{min-height:110px}
.ad-slot[data-ad-slot="inArticle"]{min-height:250px}
.ad-slot[data-ad-slot="sidebar"]{min-height:600px;margin:0}
.ad-slot[data-ad-slot="footer"]{min-height:110px;max-width:970px;margin-left:auto;margin-right:auto}
.ad-slot ins{display:block;width:100%}
.ad-slot.loaded{border:0;background:transparent;padding:0;min-height:0}
.ad-slot.loaded::before{display:none}

/* ---------- FAQ ---------- */
.faq{border-top:1px solid var(--border)}
.faq details{border-bottom:1px solid var(--border);padding:6px 0}
.faq summary{
  cursor:pointer;list-style:none;padding:16px 40px 16px 0;position:relative;
  font-weight:700;color:var(--ink);font-size:1rem;line-height:1.45;
}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{
  content:"+";position:absolute;right:4px;top:50%;transform:translateY(-50%);
  font-size:1.35rem;font-weight:400;color:var(--accent);line-height:1;
}
.faq details[open] summary::after{content:"–"}
.faq details p,.faq details ul{font-size:.94rem;color:var(--body);margin:0 0 16px}
.faq details>:last-child{margin-bottom:16px}

/* ---------- Calculator ---------- */
.calc{background:#fff;border:1px solid var(--border);border-radius:14px;padding:26px;box-shadow:var(--shadow-sm);margin:2em 0}
.calc h2,.calc h3{margin-top:0}
.calc-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px 22px;margin-bottom:18px}
.field label{display:block;font-size:.78rem;font-weight:700;color:var(--ink-2);margin-bottom:6px}
.field input{
  width:100%;padding:10px 12px;border:1px solid var(--border-strong);border-radius:8px;
  font:500 .95rem var(--font-sans);color:var(--ink);background:#fff;
}
.field input:focus{outline:2px solid #bfd3ff;border-color:var(--accent);outline-offset:0}
.calc-results{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;border-top:1px solid var(--border);padding-top:20px}
.calc-result{background:var(--bg-soft);border-radius:10px;padding:14px 16px}
.calc-result span{display:block;font-size:.72rem;font-weight:700;letter-spacing:.05em;text-transform:uppercase;color:var(--muted);margin-bottom:4px}
.calc-result b{font-family:var(--font-serif);font-size:1.4rem;color:var(--ink);line-height:1.2}
.calc-note{font-size:.76rem;color:var(--muted);margin:14px 0 0}

/* ---------- Glossary ---------- */
.glossary-nav{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:26px}
.glossary-nav a{font-size:.78rem;font-weight:700;color:var(--muted);padding:5px 10px;border:1px solid var(--border);border-radius:6px;background:#fff}
.glossary-nav a:hover{color:var(--accent);border-color:#bfd3ff;text-decoration:none}
.glossary dt{font-weight:800;color:var(--ink);margin-top:1.6em;font-size:1.02rem}
.glossary dd{margin:6px 0 0;color:var(--body);font-size:.95rem;padding-left:0}

/* ---------- CTA band ---------- */
.cta-band{background:linear-gradient(135deg,#0b1220,#16233d);border-radius:18px;padding:42px 44px;display:grid;grid-template-columns:1fr auto;gap:28px;align-items:center;position:relative;overflow:hidden}
.cta-band::after{content:"";position:absolute;right:-60px;bottom:-120px;width:320px;height:320px;border-radius:50%;background:radial-gradient(circle,rgba(15,118,110,.45),transparent 66%)}
.cta-band h2{color:#fff;font-size:1.7rem;margin-bottom:8px}
.cta-band p{color:#a9b8ce;margin:0;font-size:.95rem;max-width:560px}
.cta-band .btn{position:relative;z-index:1;background:#fff;color:var(--ink);border-color:#fff}

/* ---------- Footer ---------- */
.site-footer{background:var(--bg-deep);color:#94a3b8;padding:56px 0 28px;margin-top:0;font-size:.9rem}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:36px;padding-bottom:36px;border-bottom:1px solid rgba(255,255,255,.1)}
.site-footer .brand{color:#fff;margin-bottom:12px}
.site-footer .brand small{color:#64748b}
.footer-about p{font-size:.86rem;line-height:1.65;max-width:330px;color:#94a3b8}
.footer-col h3{font-size:.72rem;letter-spacing:.12em;text-transform:uppercase;color:#e2e8f0;margin-bottom:14px}
.footer-col ul{list-style:none;margin:0;padding:0}
.footer-col li{margin-bottom:9px}
.footer-col a{color:#94a3b8;font-size:.86rem}
.footer-col a:hover{color:#fff;text-decoration:none}
.footer-bottom{display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px;padding-top:22px;font-size:.78rem;color:#64748b}
.footer-bottom a{color:#94a3b8}
.footer-legal{display:flex;flex-wrap:wrap;gap:16px}
.disclosure{font-size:.76rem;color:#64748b;max-width:760px;margin-top:8px;line-height:1.6}

/* ---------- 404 ---------- */
.error-page{padding:100px 0 120px;text-align:center}
.error-page .code{font-family:var(--font-serif);font-size:clamp(5rem,14vw,9rem);line-height:1;color:var(--accent);opacity:.18;margin-bottom:-.2em}
.error-page h1{font-size:2.2rem}
.error-page p{max-width:520px;margin:0 auto 26px;color:var(--muted)}

/* ---------- Utility ---------- */
.tag-row{display:flex;flex-wrap:wrap;gap:8px;margin:18px 0}
.tag-row a,.tag-row span{font-size:.76rem;font-weight:600;color:#526175;background:#fff;border:1px solid var(--border);padding:5px 10px;border-radius:999px}
.tag-row a:hover{color:var(--accent);border-color:#bfd3ff;text-decoration:none}
.meta-line{font-size:.8rem;color:var(--muted);margin-bottom:18px}
.two-col{columns:2;column-gap:34px}
.two-col li{break-inside:avoid}

/* ---------- Bar chart ---------- */
.bars{background:#fff;border:1px solid var(--border);border-radius:14px;padding:26px 26px 20px;box-shadow:var(--shadow-sm);margin:2em 0}
.bars h3{font-size:.98rem;margin:0 0 4px}
.bars .bars-sub{font-size:.8rem;color:var(--muted);margin:0 0 20px}
.bar{margin-bottom:18px}
.bar:last-child{margin-bottom:0}
.bar-top{display:flex;justify-content:space-between;gap:12px;font-size:.84rem;margin-bottom:6px}
.bar-top span{color:var(--ink-2);font-weight:600}
.bar-top b{color:var(--ink);font-family:var(--font-serif);font-size:1rem}
.bar-track{height:10px;background:#eef2f8;border-radius:99px;overflow:hidden}
.bar-fill{height:100%;border-radius:99px;background:linear-gradient(90deg,#1d4ed8,#3b82f6)}
.bar-fill.teal{background:linear-gradient(90deg,#0f766e,#14b8a6)}
.bar-fill.amber{background:linear-gradient(90deg,#b45309,#f59e0b)}
.bar-fill.gray{background:linear-gradient(90deg,#64748b,#94a3b8)}
.bars .src{font-size:.72rem;color:#94a3b8;margin:18px 0 0;line-height:1.5}

/* ---------- Trust / method ---------- */
.method{display:grid;grid-template-columns:1fr 1fr;gap:34px;align-items:start}
.method-list{list-style:none;padding:0;margin:0}
.method-list li{padding:0 0 16px 30px;position:relative;font-size:.92rem;color:var(--body);margin:0}
.method-list li strong{display:block;color:var(--ink);font-size:.96rem;margin-bottom:2px}
.method-list li::before{
  content:"";position:absolute;left:0;top:5px;width:14px;height:14px;border-radius:50%;
  border:2px solid #bfd3ff;background:#fff;
}
.method-list li::after{content:"";position:absolute;left:4.5px;top:9.5px;width:5px;height:5px;border-radius:50%;background:var(--accent)}

/* ---------- Responsive ---------- */
@media (max-width:1000px){
  .hero-inner{grid-template-columns:1fr;gap:34px;padding:54px 0 44px}
  .hero-card{max-width:520px}
  .article-grid{grid-template-columns:1fr;gap:34px}
  .sidebar{position:static;max-width:760px}
  .toc{max-height:none}
  .ad-slot[data-ad-slot="sidebar"]{min-height:250px}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:860px){
  .nav{
    display:none;position:absolute;top:100%;left:0;right:0;flex-direction:column;
    align-items:stretch;background:#fff;border-bottom:1px solid var(--border);
    padding:12px 18px 18px;gap:2px;box-shadow:0 18px 30px -18px rgba(11,18,32,.25);
  }
  .nav.open{display:flex}
  .nav a{padding:11px 10px}
  .nav .btn{margin:8px 0 0;justify-content:center}
  .nav-toggle{display:inline-block}
  .stats-grid{grid-template-columns:1fr 1fr;gap:0;padding:8px 0}
  .stat{padding:16px 0;border-right:0;border-bottom:1px solid var(--border)}
  .stat:nth-child(odd){padding-right:18px}
  .stat:nth-child(even){padding-left:18px;border-left:1px solid var(--border)}
  .stat:nth-last-child(-n+2){border-bottom:0}
  .grid-3,.grid-4{grid-template-columns:1fr 1fr}
  .feature-grid{grid-template-columns:1fr}
  .method{grid-template-columns:1fr}
  .cta-band{grid-template-columns:1fr;padding:34px 28px}
  .cta-band .btn{justify-self:start}
}
@media (max-width:640px){
  body{font-size:16px}
  .wrap{padding:0 18px}
  .section{padding:48px 0}
  .grid-2,.grid-3,.grid-4{grid-template-columns:1fr}
  .hero h1{font-size:2.15rem}
  .hero-deck{font-size:1.02rem}
  .article-head h1{font-size:1.95rem}
  .article-head .dek{font-size:1.02rem}
  .prose{font-size:1rem}
  .calc-grid,.calc-results{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr;gap:28px}
  .two-col{columns:1}
  .row{grid-template-columns:30px 1fr;gap:12px}
  .row .tag{display:none}
  .brand small{display:none}
  .feature{padding:28px}
  .feature h3{font-size:1.55rem}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition:none!important;animation:none!important}
}
@media print{
  .site-header,.site-footer,.sidebar,.ad-slot,.cta-band{display:none!important}
  .article-grid{display:block}
  body{font-size:11pt}
}