:root{
  --green:#1f9d55;
  --green-dark:#157347;
  --green-light:#e7f6ee;
  --text:#21342c;
  --muted:#5d6f67;
  --bg:#f6faf7;
  --card:#ffffff;
  --gold:#e0a800;
  --line:#e1ebe5;
  --shadow:0 6px 24px rgba(20,60,40,.08);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:"Hiragino Kaku Gothic ProN","Yu Gothic",YuGothic,Meiryo,system-ui,sans-serif;
  color:var(--text);
  background:var(--bg);
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
img{max-width:100%}
.wrap{max-width:1120px;margin:0 auto;padding:0 24px}

/* Header */
header.site{
  position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,.92);
  backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);
}
.nav{display:flex;align-items:center;justify-content:space-between;gap:12px;height:66px}
.logo{display:flex;align-items:center;gap:9px;font-weight:800;font-size:18px;letter-spacing:-.01em;white-space:nowrap}
.logo .mark{
  width:34px;height:34px;border-radius:9px;flex:none;
  background:linear-gradient(135deg,var(--green),var(--green-dark));
  color:#fff;display:grid;place-items:center;font-size:18px;font-weight:900;
}
.logo .sub{color:var(--green-dark)}
.nav-links{display:flex;gap:28px;font-size:15px;font-weight:600;color:var(--muted)}
.nav-links a:hover{color:var(--green-dark)}
.nav-cta{
  background:var(--green);color:#fff;padding:9px 18px;border-radius:999px;
  font-weight:700;font-size:14px;transition:background .2s;white-space:nowrap;
}
.nav-cta:hover{background:var(--green-dark)}
@media(max-width:820px){.nav-links{display:none}}
@media(max-width:420px){.logo{font-size:15px}.nav-cta{padding:8px 12px;font-size:13px}}

/* Hero */
.hero{padding:76px 0 64px;background:
  radial-gradient(1200px 400px at 80% -10%,var(--green-light),transparent 60%);
}
.hero h1{
  font-size:clamp(30px,5vw,52px);line-height:1.25;font-weight:900;letter-spacing:-.02em;
  margin-bottom:22px;
}
.hero h1 .hl{background:linear-gradient(transparent 62%,#ffe79a 62%);padding:0 2px}
.hero p.lead{font-size:18px;color:var(--muted);max-width:640px;margin-bottom:32px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap}
.btn{
  display:inline-block;padding:14px 28px;border-radius:999px;font-weight:700;font-size:16px;
  transition:transform .15s,box-shadow .2s;
}
.btn-primary{background:var(--green);color:#fff;box-shadow:0 8px 20px rgba(31,157,85,.28)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 12px 26px rgba(31,157,85,.36)}
.btn-ghost{background:#fff;color:var(--green-dark);border:1.5px solid var(--line)}
.btn-ghost:hover{border-color:var(--green)}

/* Stat strip */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-top:56px}
.stat{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:22px 20px;box-shadow:var(--shadow)}
.stat .num{font-size:30px;font-weight:900;color:var(--green-dark);letter-spacing:-.02em}
.stat .lbl{font-size:13.5px;color:var(--muted);margin-top:4px}
@media(max-width:820px){.stats{grid-template-columns:repeat(2,1fr)}}
@media(max-width:420px){.stat .num{font-size:24px}}

/* Section heading */
section{padding:72px 0}
.sec-head{text-align:center;max-width:680px;margin:0 auto 48px}
.sec-head .kicker{color:var(--green);font-weight:800;font-size:14px;letter-spacing:.08em;text-transform:uppercase}
.sec-head h2{font-size:clamp(26px,4vw,36px);font-weight:900;letter-spacing:-.02em;margin:10px 0 14px}
.sec-head p{color:var(--muted);font-size:16px}

/* Category / article cards */
.cats{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
@media(max-width:900px){.cats{grid-template-columns:repeat(2,1fr)}}
@media(max-width:600px){.cats{grid-template-columns:1fr}}
.cat{
  background:var(--card);border:1px solid var(--line);border-radius:18px;padding:28px 26px;
  box-shadow:var(--shadow);transition:transform .18s,box-shadow .2s;display:flex;flex-direction:column;
}
.cat:hover{transform:translateY(-4px);box-shadow:0 16px 34px rgba(20,60,40,.13)}
.cat .ico{font-size:30px;width:56px;height:56px;border-radius:14px;background:var(--green-light);display:grid;place-items:center;margin-bottom:18px}
.cat h3{font-size:20px;font-weight:800;margin-bottom:8px}
.cat p{color:var(--muted);font-size:14.5px;margin-bottom:16px;flex:1}
.cat .save{font-weight:800;color:var(--green-dark);font-size:14px;background:var(--green-light);align-self:flex-start;padding:5px 12px;border-radius:999px}
.cat .more{margin-top:16px;font-weight:700;color:var(--green);font-size:14px}
.cat .date{font-size:12.5px;color:var(--muted);margin-bottom:6px}

/* Featured */
.feature{background:linear-gradient(135deg,#13513a,#1f9d55);color:#fff;border-radius:24px;padding:52px 48px;margin-top:8px}
.feature .kicker{color:#bdf0d2;font-weight:800;font-size:13px;letter-spacing:.08em;text-transform:uppercase}
.feature h2{font-size:clamp(24px,3.5vw,34px);font-weight:900;margin:10px 0 28px;letter-spacing:-.01em}
.ftips{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
@media(max-width:820px){.ftips{grid-template-columns:1fr}.feature{padding:38px 26px}}
.ftip{background:rgba(255,255,255,.10);border:1px solid rgba(255,255,255,.18);border-radius:14px;padding:22px}
.ftip .n{font-size:13px;font-weight:800;color:#bdf0d2;margin-bottom:6px}
.ftip h4{font-size:17px;font-weight:800;margin-bottom:6px}
.ftip p{font-size:14px;color:#dff3e8}

/* Checklist */
.checklist{background:var(--card);border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow);overflow:hidden;max-width:820px;margin:0 auto}
.ck-row{display:flex;align-items:center;gap:16px;padding:18px 26px;border-bottom:1px solid var(--line)}
.ck-row:last-child{border-bottom:none}
.ck-row .tag{font-size:12px;font-weight:800;color:#fff;background:var(--green);padding:4px 10px;border-radius:999px;white-space:nowrap}
.ck-row .tag.week{background:#3b82c4}
.ck-row .tag.month{background:var(--gold)}
.ck-row .txt{flex:1;font-weight:600;font-size:15px}
.ck-row .val{color:var(--green-dark);font-weight:800;font-size:14px;white-space:nowrap}
@media(max-width:600px){.ck-row{flex-wrap:wrap;gap:8px;padding:16px 18px}.ck-row .txt{flex:1 1 100%;order:3}}

/* Article */
.article-head{padding:56px 0 36px;background:radial-gradient(1000px 320px at 80% -10%,var(--green-light),transparent 60%)}
.crumbs{font-size:13px;color:var(--muted);margin-bottom:14px}
.crumbs a{color:var(--green-dark);font-weight:600}
.article-head h1{font-size:clamp(26px,4vw,40px);line-height:1.35;font-weight:900;letter-spacing:-.02em;max-width:820px}
.article-head .meta{font-size:13.5px;color:var(--muted);margin-top:14px}
.article{max-width:780px;margin:0 auto;padding:8px 24px 40px}
.article > p,.article li{font-size:16.5px}
.article p{margin:0 0 18px}
.article h2{font-size:clamp(22px,3vw,28px);font-weight:900;letter-spacing:-.01em;margin:52px 0 18px;padding-bottom:10px;border-bottom:3px solid var(--green-light)}
.article h3{font-size:19px;font-weight:800;margin:32px 0 12px}
.article ul,.article ol{margin:0 0 20px 1.4em}
.article li{margin-bottom:6px}
.article strong{background:linear-gradient(transparent 65%,#ffe79a 65%)}
.article code{font-family:ui-monospace,Consolas,monospace;font-size:.9em;background:var(--green-light);padding:1px 6px;border-radius:5px}
.article hr{border:none;border-top:1px solid var(--line);margin:40px 0}
.callout{background:var(--card);border:1px solid var(--line);border-left:5px solid var(--green);border-radius:12px;padding:18px 22px;margin:24px 0;box-shadow:var(--shadow)}
.callout p:last-child,.callout ul:last-child{margin-bottom:0}
.callout.warn{border-left-color:var(--gold)}
.callout .ttl{font-weight:800;margin-bottom:6px}
.table-wrap{overflow-x:auto;margin:0 0 24px;border:1px solid var(--line);border-radius:12px;background:var(--card)}
.table-wrap table{border-collapse:collapse;width:100%;min-width:480px;font-size:15px}
.table-wrap th,.table-wrap td{padding:11px 14px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
.table-wrap th{background:var(--green-light);font-weight:800;color:var(--green-dark)}
.table-wrap tr:last-child td{border-bottom:none}
.toc{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:18px 22px;margin:8px 0 28px}
.toc .ttl{font-weight:800;margin-bottom:8px}
.toc ol{margin:0 0 0 1.3em}
.toc a{color:var(--green-dark);font-weight:600}
.note-small{font-size:13.5px;color:var(--muted)}
.related{max-width:780px;margin:0 auto;padding:0 24px}
.related h2{font-size:20px;font-weight:900;margin-bottom:16px}
.related .cats{grid-template-columns:repeat(2,1fr)}
@media(max-width:600px){.related .cats{grid-template-columns:1fr}}

/* Footer */
footer{background:#13241c;color:#cdded5;padding:52px 0 28px;margin-top:72px}
.foot-top{display:flex;justify-content:space-between;gap:32px;flex-wrap:wrap;padding-bottom:32px;border-bottom:1px solid rgba(255,255,255,.1)}
.foot-top .logo{color:#fff;margin-bottom:12px}
.foot-top .logo .sub{color:#7fd6a3}
.foot-col h5{color:#fff;font-size:14px;margin-bottom:12px}
.foot-col a{display:block;font-size:14px;color:#aec6ba;margin-bottom:8px}
.foot-col a:hover{color:#fff}
.foot-cols{display:flex;gap:56px;flex-wrap:wrap}
.foot-note{font-size:12.5px;color:#7e948a;margin-top:24px;line-height:1.7}
.copy{text-align:center;font-size:13px;color:#7e948a;margin-top:24px}