/* ===== CIRCUIT BREAKER — Column / Article shared styles ===== */
:root{
  --bg:#08080a;--bg-2:#0e0e12;--panel:#121217;--panel-2:#16161d;
  --line:rgba(255,255,255,.08);--text:#eef0f5;--muted:#9aa0ad;--muted-2:#6b7180;
  --cyan:#1fe0d4;--blue:#3a7bff;--purple:#8b5cff;--magenta:#e23bd6;
  --grad:linear-gradient(100deg,var(--cyan) 0%,var(--blue) 45%,var(--purple) 70%,var(--magenta) 100%);
  --grad-soft:linear-gradient(100deg,rgba(31,224,212,.16),rgba(139,92,255,.16),rgba(226,59,214,.16));
  --maxw:1180px;--ease:cubic-bezier(.2,.7,.2,1);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{background:var(--bg);color:var(--text);font-family:"Noto Sans JP",system-ui,sans-serif;font-weight:400;
  line-height:1.9;letter-spacing:.02em;overflow-x:hidden;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
::selection{background:rgba(139,92,255,.4);color:#fff}
body::before{content:"";position:fixed;inset:0;z-index:0;pointer-events:none;
  background-image:radial-gradient(rgba(255,255,255,.045) 1px,transparent 1px);background-size:22px 22px;opacity:.5}
body::after{content:"";position:fixed;inset:0;z-index:0;pointer-events:none;
  background:radial-gradient(700px 500px at 12% 8%,rgba(31,224,212,.08),transparent 60%),
    radial-gradient(800px 600px at 92% 24%,rgba(226,59,214,.08),transparent 60%),
    radial-gradient(700px 600px at 50% 112%,rgba(139,92,255,.08),transparent 60%)}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 28px;position:relative;z-index:2}
.narrow{max-width:780px}
.grad-text{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.eyebrow{font-family:"Rajdhani",sans-serif;font-weight:600;letter-spacing:.28em;text-transform:uppercase;
  font-size:13px;color:var(--cyan);display:inline-flex;align-items:center;gap:12px}
.eyebrow::before{content:"";width:30px;height:1px;background:var(--grad)}

/* header */
header{position:fixed;top:0;left:0;right:0;z-index:50;transition:background .4s var(--ease),border-color .4s var(--ease);border-bottom:1px solid transparent}
header.scrolled{background:rgba(8,8,10,.82);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:74px}
.brand{display:flex;align-items:center;gap:12px;font-family:"Orbitron",sans-serif;font-weight:700;letter-spacing:.14em;font-size:18px}
.brand .mark{width:26px;height:26px;flex:none;transform:rotate(45deg);background:var(--grad);border-radius:5px;box-shadow:0 0 18px rgba(139,92,255,.6)}
.nav-links{display:flex;align-items:center;gap:30px;font-family:"Rajdhani",sans-serif;font-weight:600;letter-spacing:.1em;font-size:14.5px;text-transform:uppercase}
.nav-links a{color:var(--muted);transition:color .25s;position:relative;padding:4px 0}
.nav-links a::after{content:"";position:absolute;left:0;bottom:-2px;height:2px;width:0;background:var(--grad);transition:width .3s var(--ease)}
.nav-links a:hover{color:#fff}.nav-links a:hover::after{width:100%}
.nav-cta{font-family:"Rajdhani",sans-serif;font-weight:700;letter-spacing:.1em;text-transform:uppercase;padding:11px 22px;border-radius:999px;font-size:14px;color:#fff;background:var(--grad);box-shadow:0 8px 24px rgba(139,92,255,.35);transition:transform .25s,box-shadow .25s}
.nav-cta:hover{transform:translateY(-2px);box-shadow:0 12px 30px rgba(226,59,214,.5)}.nav-cta::after{display:none}
.burger{display:none;flex-direction:column;gap:6px;width:40px;height:40px;align-items:center;justify-content:center;cursor:pointer}
.burger span{width:24px;height:2px;background:#fff;transition:.3s}

/* article hero */
.art-hero{padding:140px 0 34px;position:relative}
.crumb{font-family:"Rajdhani",sans-serif;font-weight:600;letter-spacing:.08em;font-size:13px;color:var(--muted-2);margin-bottom:20px}
.crumb a{color:var(--muted)}.crumb a:hover{color:var(--cyan)}
.crumb span{color:var(--muted-2)}
.art-hero h1{font-family:"Noto Sans JP",sans-serif;font-weight:700;font-size:clamp(26px,4.2vw,42px);line-height:1.45;margin:16px 0 18px;letter-spacing:.01em}
.art-meta{display:flex;gap:18px;flex-wrap:wrap;font-family:"Rajdhani",sans-serif;font-weight:600;letter-spacing:.06em;font-size:13px;color:var(--muted-2)}
.art-meta .tag{color:var(--cyan)}

/* article body */
.art-body{padding:40px 0 90px}
.art-body .lead{color:var(--text);font-weight:400;font-size:clamp(16px,2vw,18px);line-height:1.95;
  padding:24px 26px;border-radius:16px;background:var(--grad-soft);border:1px solid var(--line);margin-bottom:48px}
.art-body h2{font-family:"Noto Sans JP",sans-serif;font-weight:700;font-size:clamp(21px,3vw,28px);line-height:1.5;
  margin:56px 0 20px;padding-left:16px;border-left:4px solid;border-image:var(--grad) 1}
.art-body h3{font-weight:700;font-size:clamp(17px,2.2vw,20px);line-height:1.6;margin:38px 0 14px;color:#fff}
.art-body p{color:#c7ccd6;font-weight:300;line-height:2.1;margin-bottom:20px;font-size:16px}
.art-body b,.art-body strong{color:var(--text);font-weight:600}
.art-body a.inl{color:var(--cyan);text-decoration:underline;text-underline-offset:3px;text-decoration-color:rgba(31,224,212,.4)}
.art-body a.inl:hover{text-decoration-color:var(--cyan)}
.art-body ul,.art-body ol{margin:0 0 22px 4px;padding-left:24px}
.art-body li{color:#c7ccd6;font-weight:300;line-height:1.95;margin-bottom:10px}
.art-body ul li::marker{color:var(--cyan)}
.art-body ol li::marker{color:var(--cyan);font-family:"Orbitron",sans-serif;font-weight:700}

/* callout */
.callout{position:relative;background:linear-gradient(160deg,var(--panel),var(--bg-2));border:1px solid var(--line);
  border-radius:16px;padding:24px 28px;margin:30px 0}
.callout::before{content:"";position:absolute;left:0;top:0;bottom:0;width:3px;background:var(--grad);border-radius:3px 0 0 3px}
.callout .ct{font-family:"Rajdhani",sans-serif;font-weight:700;letter-spacing:.1em;text-transform:uppercase;font-size:12px;color:var(--cyan);margin-bottom:8px;display:block}
.callout p:last-child{margin-bottom:0}

/* table */
.cmp-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:16px;background:linear-gradient(160deg,var(--panel),var(--bg-2));margin:26px 0}
table.cmp{width:100%;min-width:560px;border-collapse:collapse;font-size:14.5px}
table.cmp th,table.cmp td{padding:16px 18px;text-align:left;border-bottom:1px solid var(--line);vertical-align:top}
table.cmp thead th{font-family:"Rajdhani",sans-serif;font-weight:700;letter-spacing:.05em;font-size:14px;color:var(--text);background:rgba(255,255,255,.02)}
table.cmp thead th.hl{background:var(--grad-soft);color:#fff}
table.cmp tbody th{font-weight:600;color:var(--muted)}
table.cmp td{color:var(--muted);font-weight:300}
table.cmp td.hl{color:var(--text);font-weight:400;background:rgba(31,224,212,.05)}
table.cmp tr:last-child th,table.cmp tr:last-child td{border-bottom:none}

/* CTA band */
.band{position:relative;border-radius:24px;overflow:hidden;padding:48px 44px;margin:60px 0 0;background:linear-gradient(130deg,#101018,#0b0b10);border:1px solid var(--line)}
.band::before{content:"";position:absolute;right:-10%;top:-40%;width:60%;height:180%;background:var(--grad);filter:blur(80px);opacity:.18;transform:rotate(20deg)}
.band-inner{position:relative;z-index:2}
.band h2{font-family:"Orbitron",sans-serif;font-weight:800;font-size:clamp(20px,3vw,28px);line-height:1.3;margin:0 0 12px;border:none;padding:0}
.band p{color:var(--muted);font-weight:300;max-width:560px;margin-bottom:24px}
.btn{font-family:"Rajdhani",sans-serif;font-weight:700;letter-spacing:.1em;text-transform:uppercase;padding:15px 32px;border-radius:999px;font-size:15px;cursor:pointer;border:1px solid transparent;
  transition:transform .25s var(--ease),box-shadow .25s;display:inline-flex;align-items:center;gap:10px}
.btn-primary{background:var(--grad);color:#fff;box-shadow:0 10px 30px rgba(139,92,255,.4)}
.btn-primary:hover{transform:translateY(-3px);box-shadow:0 16px 40px rgba(226,59,214,.55)}

/* related / column list cards */
.rel{padding:80px 0;border-top:1px solid var(--line)}
.rel .sec-h{font-family:"Rajdhani",sans-serif;font-weight:700;letter-spacing:.16em;text-transform:uppercase;font-size:14px;color:var(--muted);margin-bottom:28px}
.col-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.col-card{display:flex;flex-direction:column;background:linear-gradient(160deg,var(--panel),var(--bg-2));border:1px solid var(--line);border-radius:18px;padding:28px 26px;transition:transform .35s var(--ease),border-color .35s}
.col-card:hover{transform:translateY(-6px);border-color:rgba(31,224,212,.35)}
.col-card .k{font-family:"Rajdhani",sans-serif;font-weight:700;letter-spacing:.1em;text-transform:uppercase;font-size:11.5px;color:var(--magenta);margin-bottom:14px}
.col-card h3{font-size:17px;font-weight:700;line-height:1.6;margin-bottom:12px}
.col-card p{color:var(--muted);font-weight:300;font-size:14px;line-height:1.9;flex:1}
.col-card .more{margin-top:16px;font-family:"Rajdhani",sans-serif;font-weight:700;letter-spacing:.08em;text-transform:uppercase;font-size:12.5px;color:var(--cyan);display:inline-flex;align-items:center;gap:7px;transition:gap .25s}
.col-card:hover .more{gap:12px}

/* author / E-E-A-T byline */
.byline{display:flex;align-items:center;gap:14px;margin:28px 0 0;padding:16px 20px;background:linear-gradient(160deg,var(--panel),var(--bg-2));border:1px solid var(--line);border-radius:14px}
.byline .ava{width:46px;height:46px;flex:none;border-radius:50%;background:var(--grad);display:flex;align-items:center;justify-content:center;font-family:"Orbitron",sans-serif;font-weight:700;color:#fff;font-size:13px;box-shadow:0 0 18px rgba(139,92,255,.4)}
.byline .by-meta{font-size:13.5px;line-height:1.6}
.byline .by-meta b{color:var(--text);font-weight:600}
.byline .by-meta span{color:var(--muted-2);display:block;font-size:12px}

/* table of contents */
.toc{background:linear-gradient(160deg,var(--panel),var(--bg-2));border:1px solid var(--line);border-radius:16px;padding:24px 28px;margin:0 0 44px}
.toc .toc-h{font-family:"Rajdhani",sans-serif;font-weight:700;letter-spacing:.12em;text-transform:uppercase;font-size:12px;color:var(--cyan);margin-bottom:16px}
.toc ol{counter-reset:toc;list-style:none;margin:0;padding:0}
.toc li{counter-increment:toc;margin-bottom:11px;padding-left:34px;position:relative;line-height:1.6}
.toc li::before{content:counter(toc,decimal-leading-zero);position:absolute;left:0;top:1px;font-family:"Orbitron",sans-serif;font-weight:700;font-size:12px;color:var(--magenta)}
.toc a{color:#c7ccd6;font-size:14.5px;font-weight:300;transition:color .2s}
.toc a:hover{color:var(--cyan)}
.toc li:last-child{margin-bottom:0}

/* key takeaways box */
.keybox{background:var(--grad-soft);border:1px solid var(--line);border-radius:16px;padding:24px 28px;margin:30px 0}
.keybox .kb-h{font-family:"Rajdhani",sans-serif;font-weight:700;letter-spacing:.1em;text-transform:uppercase;font-size:12px;color:var(--cyan);margin-bottom:12px;display:block}
.keybox ul{margin:0;padding-left:22px}
.keybox li{color:var(--text);font-weight:400;margin-bottom:8px}
.keybox li:last-child{margin-bottom:0}

/* calc / example box */
.calc{background:linear-gradient(160deg,#0d1014,#0b0b10);border:1px dashed rgba(31,224,212,.4);border-radius:14px;padding:20px 24px;margin:24px 0}
.calc .cl-h{font-family:"Rajdhani",sans-serif;font-weight:700;letter-spacing:.08em;text-transform:uppercase;font-size:12px;color:var(--magenta);margin-bottom:12px;display:block}
.calc .row{display:flex;justify-content:space-between;gap:16px;padding:8px 0;border-bottom:1px solid var(--line);font-size:14.5px;color:#c7ccd6}
.calc .row:last-of-type{border-bottom:none}
.calc .row.total{color:var(--text);font-weight:600;font-size:16px;border-top:1px solid rgba(31,224,212,.3);border-bottom:none;margin-top:4px;padding-top:12px}
.calc .row b{color:var(--text);font-weight:600}

/* in-article FAQ */
.art-faq{display:flex;flex-direction:column;gap:12px;margin:26px 0}
.art-faq details{background:linear-gradient(160deg,var(--panel),var(--bg-2));border:1px solid var(--line);border-radius:14px;overflow:hidden;transition:border-color .3s}
.art-faq details[open]{border-color:rgba(31,224,212,.3)}
.art-faq summary{list-style:none;cursor:pointer;padding:18px 22px;display:flex;gap:14px;align-items:flex-start;font-weight:500;font-size:15.5px;color:var(--text)}
.art-faq summary::-webkit-details-marker{display:none}
.art-faq summary .qq{font-family:"Orbitron",sans-serif;font-weight:700;color:transparent;background:var(--grad);-webkit-background-clip:text;background-clip:text;flex:none}
.art-faq .aa{padding:0 22px 20px 50px;color:#c7ccd6;font-weight:300;line-height:2;font-size:14.5px}
.art-faq .aa a{color:var(--cyan)}

/* small note */
.note{font-size:13px;color:var(--muted-2);line-height:1.85;margin:18px 0}

/* footer */
footer{border-top:1px solid var(--line);padding:60px 0 34px;position:relative;z-index:2}
.foot-top{display:flex;justify-content:space-between;gap:40px;flex-wrap:wrap;margin-bottom:44px}
.foot-brand .brand{margin-bottom:18px}
.foot-brand p{color:var(--muted);font-weight:300;font-size:14px;max-width:340px;line-height:2}
.foot-cols{display:flex;gap:72px;flex-wrap:wrap}
.foot-col h5{font-family:"Rajdhani",sans-serif;font-weight:700;letter-spacing:.14em;text-transform:uppercase;font-size:12px;color:var(--muted-2);margin-bottom:16px}
.foot-col a,.foot-col p{display:block;color:var(--muted);font-size:14px;font-weight:300;margin-bottom:10px;transition:color .25s}
.foot-col a:hover{color:var(--cyan)}
.foot-bottom{display:flex;justify-content:space-between;align-items:center;gap:20px;flex-wrap:wrap;padding-top:26px;border-top:1px solid var(--line);font-size:12.5px;color:var(--muted-2);font-family:"Rajdhani",sans-serif;letter-spacing:.08em}

@media(max-width:860px){.col-grid{grid-template-columns:1fr}}
@media(max-width:760px){
  .nav-links{display:none}.burger{display:flex}
  .nav-links.open{display:flex;position:fixed;inset:74px 0 auto 0;flex-direction:column;background:rgba(8,8,10,.97);backdrop-filter:blur(16px);padding:30px 28px;gap:22px;border-bottom:1px solid var(--line);font-size:18px}
  .band{padding:40px 26px}
}