:root{
  --bg:#f7f8fb;
  --surface:#ffffff;
  --ink:#1f2430;
  --ink-soft:#5b6472;
  --line:#e6e9f0;
  --brand:#3a5bd9;
  --brand-dark:#2840a8;
  --accent:#f5a524;
  --accent-soft:#fff4dc;
  --ok:#1f9d6b;
  --radius:14px;
  --shadow:0 1px 2px rgba(20,30,60,.06),0 8px 24px rgba(20,30,60,.06);
  --maxw:1040px;
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI",YakuHanJP,"Hiragino Sans","ヒラギノ角ゴ ProN W3","Hiragino Kaku Gothic ProN",Meiryo,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:var(--font);
  color:var(--ink);
  background:var(--bg);
  line-height:1.7;
  -webkit-text-size-adjust:100%;
}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;height:auto}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 18px}

/* Header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);backdrop-filter:saturate(160%) blur(8px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;gap:18px;height:62px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:1.18rem;color:var(--ink)}
.brand .mark{display:inline-grid;place-items:center;width:34px;height:34px;border-radius:9px;background:linear-gradient(135deg,var(--brand),var(--brand-dark));color:#fff;font-weight:900}
.brand span small{display:block;font-size:.62rem;font-weight:600;color:var(--ink-soft);letter-spacing:.18em}
.nav-links{display:flex;gap:6px;margin-left:auto;flex-wrap:wrap}
.nav-links a{color:var(--ink-soft);font-weight:600;font-size:.92rem;padding:8px 12px;border-radius:9px}
.nav-links a:hover{background:var(--bg);color:var(--brand);text-decoration:none}
.nav-toggle{display:none}

/* Hero */
.hero{position:relative;overflow:hidden;background:radial-gradient(1100px 460px at 82% -12%,#e8edff 0,transparent 60%),linear-gradient(180deg,#ffffff,#f7f8fb);padding:72px 0 58px;border-bottom:1px solid var(--line)}
.hero-inner{max-width:760px}
.hero h1{font-size:clamp(1.9rem,4.8vw,3rem);line-height:1.28;margin:0 0 16px;letter-spacing:.005em;font-weight:850}
.hero h1 .grad{background:linear-gradient(115deg,var(--brand),#7c3aed 70%);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero .lede{font-size:1.08rem;color:var(--ink-soft);margin:0 0 24px;max-width:620px}
.hero .cta{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:34px}
.hero-stats{display:flex;flex-wrap:wrap;gap:14px}
.hero-stats>div{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:14px 20px;min-width:120px;box-shadow:var(--shadow)}
.hero-stats b{display:block;font-size:1.5rem;font-weight:850;color:var(--brand-dark);line-height:1.1}
.hero-stats span{font-size:.82rem;color:var(--ink-soft);font-weight:600}
.sec-head{display:flex;align-items:baseline;justify-content:space-between;gap:10px;margin:0 0 4px}
.sec-head h2{margin:0}
.linkmore{font-weight:700;font-size:.92rem;white-space:nowrap}
.btn{display:inline-block;background:var(--brand);color:#fff;font-weight:700;padding:12px 22px;border-radius:11px;box-shadow:var(--shadow);font-size:1rem}
.btn:hover{background:var(--brand-dark);text-decoration:none;color:#fff}
.btn.ghost{background:#fff;color:var(--brand);border:1px solid var(--line)}
.pill{display:inline-block;font-size:.78rem;font-weight:700;color:var(--brand-dark);background:#eef2ff;padding:5px 11px;border-radius:999px;margin-bottom:14px}
.pill.experiment{background:linear-gradient(135deg,#ede9fe,#e0f2fe);color:#5b21b6;border:1px solid #ddd6fe}
.card.coming{opacity:.72;background:linear-gradient(180deg,#fafbff,#f4f6fb)}
.card.coming .ic{filter:grayscale(.3)}
.card .go.muted{color:var(--ink-soft);font-weight:600}
.experiment-note{background:#f5f3ff;border:1px solid #ddd6fe;color:#4c1d95}
.experiment-note b{color:#5b21b6}
.tip{background:#eefaf3;border:1px solid #cdeede;color:#1f7a52}
.tip b{color:#13653f}

/* Section */
.section{padding:38px 0}
.section h2{font-size:1.5rem;margin:0 0 6px}
.section .lead{color:var(--ink-soft);margin:0 0 22px}
.grid{display:grid;gap:16px;grid-template-columns:repeat(auto-fill,minmax(230px,1fr))}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow);transition:transform .15s ease,box-shadow .15s ease}
.card:hover{transform:translateY(-3px);box-shadow:0 12px 30px rgba(20,30,60,.1)}
.card .ic{font-size:1.6rem;margin-bottom:8px}
.card h3{margin:0 0 6px;font-size:1.08rem}
.card p{margin:0;color:var(--ink-soft);font-size:.9rem}
.card .go{margin-top:12px;font-weight:700;font-size:.88rem}

/* Tool layout */
.tool-wrap{display:grid;grid-template-columns:1fr;gap:24px}
@media(min-width:860px){.tool-wrap{grid-template-columns:minmax(0,1fr) 300px}}
.panel{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow)}
.panel h1{font-size:1.4rem;margin:0 0 4px}
.panel .sub{color:var(--ink-soft);margin:0 0 18px;font-size:.92rem}
.field{margin-bottom:14px}
.field label{display:block;font-weight:700;margin-bottom:6px;font-size:.9rem}
.field input,.field select,.field textarea{width:100%;padding:11px 12px;border:1px solid var(--line);border-radius:10px;font-size:1rem;font-family:inherit;background:#fff;color:var(--ink)}
.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 3px #e8edff}
.row{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.result{margin-top:16px;background:var(--accent-soft);border:1px solid #ffe2a8;border-radius:12px;padding:16px;font-size:1.05rem}
.result .big{font-size:1.5rem;font-weight:800;color:var(--brand-dark)}
.result .note{font-size:.82rem;color:var(--ink-soft);margin-top:6px}
.side h3{font-size:1rem;margin:0 0 10px}
.side .mini{display:grid;gap:8px}
.side .mini a{display:block;background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:10px 12px;color:var(--ink);font-weight:600;font-size:.9rem}
.side .mini a:hover{border-color:var(--brand);text-decoration:none}

/* Breadcrumb */
.crumbs{font-size:.82rem;color:var(--ink-soft);padding:14px 0 0}
.crumbs a{color:var(--ink-soft)}
.crumbs span{margin:0 6px}

/* Ad slots */
.ad-slot{margin:22px 0;min-height:90px;display:flex;align-items:center;justify-content:center;border:1px dashed var(--line);border-radius:12px;background:#fbfcfe}
.ad-slot.ad-placeholder span{color:#9aa3b2;font-size:.82rem;font-weight:600;letter-spacing:.04em}
.ad-slot.inline{margin:26px auto;max-width:728px}

/* Blog */
.post{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow);margin-bottom:18px}
.post h3{margin:0 0 6px;font-size:1.15rem}
.post .meta{color:var(--ink-soft);font-size:.82rem;margin:0 0 10px}
.post p{margin:0 0 10px}
.post .more{font-weight:700}
.article{max-width:760px;margin:0 auto}
.article h1{font-size:1.9rem;line-height:1.35;margin:6px 0 8px}
.article h2{font-size:1.35rem;margin:30px 0 10px;border-left:4px solid var(--brand);padding-left:12px}
.article h3{font-size:1.1rem;margin:22px 0 8px}
.article p,.article li{font-size:1.02rem;color:#2b313d}
.article img,.article pre{margin:16px 0}
.article pre{background:#1f2430;color:#e6e9f0;padding:16px;border-radius:12px;overflow:auto;font-size:.88rem}
.article blockquote{margin:16px 0;padding:12px 16px;background:#eef2ff;border-left:4px solid var(--brand);border-radius:0 10px 10px 0;color:var(--ink-soft)}

/* Footer */
.site-footer{background:#11151f;color:#c7ccd6;margin-top:40px;padding:34px 0}
.site-footer a{color:#aab4ff}
.site-footer .cols{display:grid;gap:24px;grid-template-columns:repeat(auto-fit,minmax(180px,1fr))}
.site-footer h4{color:#fff;font-size:.95rem;margin:0 0 10px}
.site-footer ul{list-style:none;padding:0;margin:0;display:grid;gap:6px}
.site-footer .copy{margin-top:26px;font-size:.82rem;color:#7e889a;border-top:1px solid #232838;padding-top:16px}

/* Misc */
.notice{background:#eef2ff;border:1px solid #d7e0ff;border-radius:12px;padding:14px 16px;font-size:.9rem;color:var(--brand-dark);margin:18px 0}
.tag{display:inline-block;font-size:.74rem;font-weight:700;color:#fff;background:var(--accent);padding:3px 9px;border-radius:999px;margin-right:6px}
.kv{display:flex;justify-content:space-between;gap:12px;padding:9px 0;border-bottom:1px solid var(--line)}
.kv:last-child{border-bottom:none}
.kv .k{color:var(--ink-soft)}
.kv .v{font-weight:700;text-align:right}