/* =========================================================
   カデン比較ナビ — Design System
   ========================================================= */
:root{
  --accent:#4f46e5;        /* indigo */
  --accent-2:#06b6d4;      /* cyan   */
  --accent-grad:linear-gradient(135deg,#6366f1 0%,#06b6d4 100%);
  --bg:#ffffff;
  --surface:#f7f8fb;
  --card:#ffffff;
  --text:#0f172a;
  --muted:#64748b;
  --border:#e6e9ef;
  --shadow:0 1px 2px rgba(15,23,42,.04),0 8px 24px rgba(15,23,42,.06);
  --shadow-lg:0 12px 40px rgba(15,23,42,.12);
  --radius:16px;
  --radius-sm:12px;
  --maxw:1080px;
}
html[data-theme="dark"]{
  --bg:#0b1020; --surface:#0f152a; --card:#121a33; --text:#e8ecf6; --muted:#9aa6c0;
  --border:#1f2a47; --shadow:0 1px 2px rgba(0,0,0,.3),0 10px 30px rgba(0,0,0,.35);
  --shadow-lg:0 16px 50px rgba(0,0,0,.5);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;font-family:"Noto Sans JP",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  color:var(--text);background:var(--bg);line-height:1.85;-webkit-font-smoothing:antialiased;
  letter-spacing:.01em;
}
a{color:var(--accent);text-decoration:none}
img{max-width:100%}
.container{max-width:var(--maxw);margin:0 auto;padding:0 20px}

/* progress bar (記事の読了) */
.progress{position:fixed;top:0;left:0;height:3px;width:0;z-index:120;
  background:var(--accent-grad);transition:width .1s linear;opacity:0}
body.is-article .progress{opacity:1}

/* ---------- header ---------- */
.site-header{position:sticky;top:0;z-index:100;background:color-mix(in srgb,var(--bg) 82%,transparent);
  backdrop-filter:saturate(160%) blur(12px);border-bottom:1px solid transparent;transition:.25s}
.site-header.scrolled{border-bottom-color:var(--border);box-shadow:0 4px 20px rgba(15,23,42,.05)}
.header-inner{display:flex;align-items:center;gap:18px;height:64px}
.brand{display:flex;align-items:center;gap:10px;font-weight:900;color:var(--text);font-size:18px}
.brand-mark{display:grid;place-items:center;width:32px;height:32px;border-radius:9px;
  background:var(--accent-grad);color:#fff;font-size:15px;box-shadow:0 4px 12px rgba(79,70,229,.35)}
.gnav{margin-left:auto;display:flex;gap:6px}
.gnav a{padding:8px 12px;border-radius:10px;color:var(--muted);font-size:14px;font-weight:500;transition:.2s}
.gnav a:hover{color:var(--text);background:var(--surface)}
.header-actions{display:flex;align-items:center;gap:8px}
.gnav+.header-actions{margin-left:8px}
.icon-btn{width:40px;height:40px;border:1px solid var(--border);background:var(--card);border-radius:11px;
  cursor:pointer;display:grid;place-items:center;color:var(--text);transition:.2s}
.icon-btn:hover{border-color:var(--accent);color:var(--accent)}
.theme-toggle::before{content:"🌙";font-size:17px}
html[data-theme="dark"] .theme-toggle::before{content:"☀️"}
.nav-toggle{display:none;flex-direction:column;gap:4px}
.nav-toggle span{width:18px;height:2px;background:currentColor;border-radius:2px;transition:.25s}
.mobile-nav{display:none;flex-direction:column;padding:8px 20px 16px;gap:2px;border-bottom:1px solid var(--border);background:var(--bg)}
.mobile-nav a{padding:12px 10px;border-radius:10px;color:var(--text);font-weight:500}
.mobile-nav a:hover{background:var(--surface)}
.mobile-nav.open{display:flex;animation:fade .25s ease}

/* ---------- hero ---------- */
.hero{position:relative;overflow:hidden;color:#fff;isolation:isolate}
.hero-bg{position:absolute;inset:0;z-index:-1;background:var(--accent-grad)}
.hero-bg::after{content:"";position:absolute;inset:0;
  background:radial-gradient(800px 400px at 80% -10%,rgba(255,255,255,.35),transparent 60%),
             radial-gradient(600px 300px at 0% 120%,rgba(255,255,255,.18),transparent 60%)}
.hero-inner{padding:84px 20px 96px;text-align:center}
.hero-eyebrow{display:inline-block;font-size:13px;font-weight:700;letter-spacing:.14em;
  background:rgba(255,255,255,.18);padding:7px 14px;border-radius:999px;margin:0 0 18px}
.hero-title{font-size:clamp(30px,5.4vw,54px);line-height:1.25;font-weight:900;margin:0 0 18px;letter-spacing:.01em}
.hero-sub{max-width:620px;margin:0 auto 28px;font-size:clamp(15px,2.2vw,18px);opacity:.95}
.hero-cta{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}

/* buttons */
.btn{display:inline-flex;align-items:center;gap:8px;padding:13px 26px;border-radius:999px;font-weight:700;
  font-size:15px;transition:.2s;cursor:pointer;border:1px solid transparent}
.btn-primary{background:#fff;color:var(--accent)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 10px 30px rgba(0,0,0,.18)}
.btn-ghost{background:rgba(255,255,255,.12);color:#fff;border-color:rgba(255,255,255,.5)}
.btn-ghost:hover{background:rgba(255,255,255,.22)}
.btn-light{background:#fff;color:var(--accent)}
.btn-light:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg)}

/* ---------- sections ---------- */
.section{padding:64px 20px}
.section-title{font-size:clamp(22px,3.4vw,30px);font-weight:900;margin:0 0 6px;text-align:center}
.section-lead{color:var(--muted);text-align:center;margin:0 0 36px}

/* category cards */
.cat-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:18px;max-width:var(--maxw);margin:0 auto}
.cat-card{position:relative;display:flex;flex-direction:column;gap:8px;padding:26px 22px;border-radius:var(--radius);
  background:var(--card);border:1px solid var(--border);box-shadow:var(--shadow);overflow:hidden;transition:.28s}
.cat-card::before{content:"";position:absolute;inset:0 0 auto 0;height:4px;background:var(--accent-grad);opacity:.9}
.cat-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg);border-color:transparent}
.cat-card-ico{font-size:34px}
.cat-card-name{font-weight:800;font-size:18px}
.cat-card-desc{color:var(--muted);font-size:13.5px;flex:1}
.cat-card-go{color:var(--accent);font-weight:700;font-size:14px;margin-top:6px}

/* article cards */
.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:20px}
.card{display:flex;flex-direction:column;background:var(--card);border:1px solid var(--border);
  border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:.28s;color:var(--text)}
.card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg);border-color:transparent}
.card-thumb{height:120px;display:grid;place-items:center;font-size:46px;position:relative;color:#fff}
.card-thumb>span{filter:drop-shadow(0 6px 10px rgba(0,0,0,.25))}
.card-thumb[data-cat="earphone"]{background:linear-gradient(135deg,#6366f1,#22d3ee)}
.card-thumb[data-cat="robot-cleaner"]{background:linear-gradient(135deg,#0ea5e9,#14b8a6)}
.card-thumb[data-cat="dryer"]{background:linear-gradient(135deg,#f43f5e,#f59e0b)}
.card-thumb[data-cat="air-purifier"]{background:linear-gradient(135deg,#10b981,#22d3ee)}
.card-thumb[data-cat="vacuum"]{background:linear-gradient(135deg,#8b5cf6,#ec4899)}
.card-body{padding:18px 18px 20px;display:flex;flex-direction:column;gap:8px}
.card-cat{align-self:flex-start;font-size:11.5px;font-weight:700;color:var(--accent);
  background:color-mix(in srgb,var(--accent) 12%,transparent);padding:4px 10px;border-radius:999px}
.card-title{font-weight:800;font-size:16px;line-height:1.5}
.card-desc{color:var(--muted);font-size:13px;line-height:1.7;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}

/* band CTA */
.band{margin:24px 0 0;background:var(--accent-grad);color:#fff}
.band-inner{padding:64px 20px;text-align:center}
.band-inner h2{font-size:clamp(22px,3.4vw,30px);font-weight:900;margin:0 0 10px}
.band-inner p{opacity:.95;max-width:600px;margin:0 auto 24px}

/* category hero */
.cat-hero{color:#fff;position:relative;overflow:hidden;background:var(--accent-grad)}
.cat-hero .container{padding:56px 20px 60px}
.cat-hero-icon{font-size:52px;margin-bottom:8px}
.cat-hero h1{font-size:clamp(24px,4vw,38px);font-weight:900;margin:0 0 10px}
.cat-hero p{opacity:.95;max-width:640px}

/* ---------- article ---------- */
.article-layout{display:grid;grid-template-columns:minmax(0,1fr) 260px;gap:44px;padding:44px 20px 20px;align-items:start}
.article{min-width:0}
.breadcrumb{display:flex;flex-wrap:wrap;gap:8px;font-size:13px;color:var(--muted);margin:0 0 18px}
.breadcrumb a{color:var(--muted)}.breadcrumb a:hover{color:var(--accent)}
.breadcrumb.light,.breadcrumb.light a{color:rgba(255,255,255,.85)}
.chip{display:inline-flex;align-items:center;gap:6px;font-size:13px;font-weight:700;color:var(--accent);
  background:color-mix(in srgb,var(--accent) 12%,transparent);padding:6px 13px;border-radius:999px}
.article-title{font-size:clamp(25px,4.2vw,40px);line-height:1.4;font-weight:900;margin:16px 0 12px;letter-spacing:.01em}
.article-meta{color:var(--muted);font-size:13.5px;margin-bottom:26px;padding-bottom:22px;border-bottom:1px solid var(--border)}

.content{font-size:16.5px}
.content h2{font-size:clamp(20px,3vw,26px);font-weight:900;margin:48px 0 16px;padding-left:16px;position:relative;scroll-margin-top:84px}
.content h2::before{content:"";position:absolute;left:0;top:.18em;bottom:.18em;width:6px;border-radius:6px;background:var(--accent-grad)}
.content p{margin:0 0 18px}
.content ul,.content ol{margin:0 0 20px;padding-left:1.4em}
.content li{margin:10px 0}
.content li strong,.content p strong{color:var(--text);font-weight:700}
.content hr{border:none;border-top:1px solid var(--border);margin:34px 0}
.content ol{counter-reset:step;list-style:none;padding-left:0}
.content ol>li{position:relative;padding:14px 16px 14px 52px;margin:12px 0;background:var(--surface);
  border:1px solid var(--border);border-radius:var(--radius-sm)}
.content ol>li::before{counter-increment:step;content:counter(step);position:absolute;left:14px;top:13px;
  width:26px;height:26px;border-radius:50%;background:var(--accent-grad);color:#fff;font-weight:800;
  font-size:13px;display:grid;place-items:center}
.content ul{list-style:none;padding-left:0}
.content ul>li{position:relative;padding-left:28px}
.content ul>li::before{content:"";position:absolute;left:6px;top:.7em;width:9px;height:9px;border-radius:50%;
  background:var(--accent-2);box-shadow:0 0 0 4px color-mix(in srgb,var(--accent-2) 18%,transparent)}

/* アフィリエイトCTA（本文中の target=_blank リンク） */
.content a[target="_blank"]{display:block;margin:22px 0;padding:20px 22px;border-radius:var(--radius);
  background:linear-gradient(135deg,color-mix(in srgb,var(--accent) 8%,var(--card)),var(--card));
  border:1px solid color-mix(in srgb,var(--accent) 30%,var(--border));color:var(--text);font-weight:700;
  line-height:1.7;box-shadow:var(--shadow);transition:.25s;position:relative;padding-right:54px}
.content a[target="_blank"]::after{content:"›";position:absolute;right:22px;top:50%;transform:translateY(-50%);
  font-size:24px;color:var(--accent);transition:.25s}
.content a[target="_blank"]:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg);border-color:var(--accent)}
.content a[target="_blank"]:hover::after{right:16px}

.share-note{margin-top:34px;padding:16px 18px;border-radius:var(--radius-sm);background:var(--surface);
  border:1px dashed var(--border);color:var(--muted);font-size:14px;text-align:center}

/* TOC */
.toc{position:sticky;top:84px;align-self:start;background:var(--card);border:1px solid var(--border);
  border-radius:var(--radius);padding:18px 18px;box-shadow:var(--shadow)}
.toc-title{font-weight:800;font-size:14px;margin:0 0 10px}
.toc ol{list-style:none;margin:0;padding:0;counter-reset:toc}
.toc li{margin:0}
.toc a{display:block;padding:7px 10px;border-radius:8px;font-size:13px;color:var(--muted);line-height:1.5;
  border-left:2px solid transparent;transition:.2s}
.toc a:hover{color:var(--text);background:var(--surface)}
.toc a.active{color:var(--accent);background:color-mix(in srgb,var(--accent) 10%,transparent);
  border-left-color:var(--accent);font-weight:700}

.related{padding:10px 20px 70px;text-align:center}
.more-link{display:inline-block;margin-top:6px;font-weight:700}
.empty{color:var(--muted);text-align:center;padding:40px 0}

/* ---------- footer ---------- */
.site-footer{background:var(--surface);border-top:1px solid var(--border);margin-top:40px;padding:44px 0 30px}
.foot-top{display:flex;flex-wrap:wrap;gap:14px 24px;align-items:center;justify-content:space-between}
.foot-brand{display:flex;align-items:center;gap:10px;font-weight:900}
.foot-nav{display:flex;flex-wrap:wrap;gap:6px}
.foot-nav a{color:var(--muted);font-size:14px;padding:6px 10px;border-radius:8px}
.foot-nav a:hover{color:var(--text);background:var(--card)}
.foot-desc{color:var(--muted);margin:18px 0 6px;font-size:14px}
.disclaimer{color:var(--muted);font-size:12px;margin:6px 0}
.copy{color:var(--muted);font-size:12px;margin:14px 0 0}

/* to-top */
.to-top{position:fixed;right:20px;bottom:20px;width:46px;height:46px;border-radius:50%;border:none;
  background:var(--accent-grad);color:#fff;font-size:20px;cursor:pointer;box-shadow:var(--shadow-lg);
  opacity:0;pointer-events:none;transform:translateY(10px);transition:.28s;z-index:90}
.to-top.show{opacity:1;pointer-events:auto;transform:none}

/* reveal animation */
.reveal{opacity:0;transform:translateY(18px)}
.reveal.in{opacity:1;transform:none;transition:opacity .6s ease,transform .6s cubic-bezier(.2,.7,.2,1)}
@media (prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none}.reveal.in{transition:none}}

@keyframes fade{from{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:none}}

/* ---------- responsive ---------- */
@media (max-width:900px){
  .article-layout{grid-template-columns:1fr;gap:0}
  .toc{position:static;margin:0 0 26px;order:-1}
}
@media (max-width:720px){
  .gnav{display:none}
  .nav-toggle{display:flex}
  .nav-toggle.open span:nth-child(1){transform:translateY(6px) rotate(45deg)}
  .nav-toggle.open span:nth-child(2){opacity:0}
  .nav-toggle.open span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}
  .hero-inner{padding:64px 20px 72px}
  .section{padding:48px 20px}
}