:root{
  --paper:#F2F3EE; --paper-2:#E8EBE4; --ink:#16211F; --ink-2:#3E4C49; --mute:#6E7D79;
  --water:#1E4A44; --water-2:#2B6A61; --water-tint:#DCE7E2; --line:#CBD4CF;
  --fish:#E9601F; --fish-2:#F2A65A; --white-fish:#FBF7EE; --black-fish:#1C1B1A; --calico:#7A8FB8;
  --card:#FBFBF8; --focus:#E9601F;
  --hero-water:#26584F; --hero-water-2:#1B3F39; --hero-rim:#8C6A3F;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --paper:#0F1A19; --paper-2:#132120; --ink:#EEF1EC; --ink-2:#C2CBC6; --mute:#8A9995;
    --water:#7FB8AD; --water-2:#5C9C90; --water-tint:#16302C; --line:#264743;
    --card:#152423; --white-fish:#F3EEE2;
    --hero-water:#1B3F39; --hero-water-2:#122D29; --hero-rim:#6E5230;
  }
}
:root[data-theme="dark"]{
  --paper:#0F1A19; --paper-2:#132120; --ink:#EEF1EC; --ink-2:#C2CBC6; --mute:#8A9995;
  --water:#7FB8AD; --water-2:#5C9C90; --water-tint:#16302C; --line:#264743;
  --card:#152423; --white-fish:#F3EEE2;
  --hero-water:#1B3F39; --hero-water-2:#122D29; --hero-rim:#6E5230;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto} *{animation:none!important;transition:none!important}}
body{margin:0;background:var(--paper);color:var(--ink);font-family:Karla,"Helvetica Neue",Arial,sans-serif;font-size:17px;line-height:1.6;-webkit-font-smoothing:antialiased}
h1,h2,h3,h4{font-family:"Shippori Mincho","Yu Mincho","Hiragino Mincho ProN",Georgia,serif;font-weight:500;line-height:1.15;margin:0;text-wrap:balance;letter-spacing:-.005em}
h1{font-size:clamp(2.6rem,6vw,4.6rem)}
h2{font-size:clamp(1.9rem,3.6vw,2.7rem)}
h3{font-size:1.35rem}
h4{font-size:1.05rem;font-family:Karla,sans-serif;font-weight:700}
p{margin:0}
a{color:var(--water);text-decoration-thickness:1px;text-underline-offset:3px}
a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible{outline:2px solid var(--focus);outline-offset:3px}
.mono{font-family:"IBM Plex Mono",Menlo,monospace;font-variant-numeric:tabular-nums}
.eyebrow{font-family:"IBM Plex Mono",monospace;font-size:.72rem;letter-spacing:.14em;text-transform:uppercase;color:var(--water);font-weight:500}
.wrap{max-width:1120px;margin:0 auto;padding:0 clamp(18px,4vw,40px)}
.prose{max-width:62ch}
section{padding:clamp(56px,8vw,104px) 0;border-top:1px solid var(--line)}
.sec-head{display:flex;flex-direction:column;gap:12px;margin-bottom:clamp(28px,4vw,48px)}
.sec-head .lede{color:var(--ink-2);max-width:62ch;font-size:1.08rem}

/* nav */
nav{position:sticky;top:0;z-index:20;background:color-mix(in srgb,var(--paper) 88%,transparent);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
nav .wrap{display:flex;align-items:center;justify-content:space-between;height:60px;gap:20px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);font-family:"Shippori Mincho",serif;font-size:1.25rem;font-weight:700}
.brand svg{width:34px;height:34px}
.brand small{font-family:"IBM Plex Mono",monospace;font-size:.68rem;letter-spacing:.12em;color:var(--mute);font-weight:400;margin-left:4px}
nav ul{list-style:none;margin:0;padding:0;display:flex;gap:22px;font-size:.92rem;font-weight:500;overflow-x:auto}
nav ul a{color:var(--ink-2);text-decoration:none;white-space:nowrap}
nav ul a:hover{color:var(--water)}
@media(max-width:760px){nav ul{display:none}}


/* hero */
.hero{border-top:0;padding:clamp(40px,6vw,80px) 0 clamp(40px,6vw,72px)}
.hero .wrap{display:grid;grid-template-columns:1.05fr .95fr;gap:clamp(28px,5vw,64px);align-items:center}
@media(max-width:860px){.hero .wrap{grid-template-columns:1fr}}
.hero-copy{display:flex;flex-direction:column;gap:22px}
.hero h1 em{font-style:normal;color:var(--water)}
.hero .jp{font-family:"Shippori Mincho",serif;color:var(--mute);font-size:1.05rem;letter-spacing:.2em}
.hero .lede{font-size:1.15rem;color:var(--ink-2);max-width:54ch}
.cta-row{display:flex;gap:12px;flex-wrap:wrap;margin-top:6px}
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 20px;border-radius:999px;font-weight:700;text-decoration:none;font-size:.95rem;border:1.5px solid transparent;cursor:pointer;font-family:inherit}
.btn.primary{background:var(--water);color:var(--paper)}
:root[data-theme="dark"] .btn.primary{color:#0F1A19}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]) .btn.primary{color:#0F1A19}}
.btn.ghost{border-color:var(--line);color:var(--ink)}
.btn:hover{filter:brightness(1.08)}
.tub{width:100%;max-width:520px;margin:0 auto;display:block}
.tub .fish{transform-origin:center;animation:drift 9s ease-in-out infinite}
.tub .fish.b{animation-duration:12s;animation-delay:-4s}
@keyframes drift{0%,100%{transform:translate(0,0) rotate(0)}50%{transform:translate(6px,-8px) rotate(3deg)}}
.hero-caption{font-size:.82rem;color:var(--mute);text-align:center;margin-top:10px;font-family:"IBM Plex Mono",monospace}

/* facts strip */
.facts{display:grid;grid-template-columns:repeat(6,1fr);border:1px solid var(--line);border-radius:6px;overflow:hidden;background:var(--card)}
.facts>div{padding:16px 14px;border-right:1px solid var(--line);display:flex;flex-direction:column;gap:4px}
.facts>div:last-child{border-right:0}
.facts b{font-family:"IBM Plex Mono",monospace;font-size:1rem;white-space:nowrap;font-weight:500;font-variant-numeric:tabular-nums}
.facts span{font-size:.78rem;color:var(--mute);letter-spacing:.04em}
@media(max-width:900px){.facts{grid-template-columns:repeat(3,1fr)} .facts>div:nth-child(3){border-right:0} .facts>div:nth-child(-n+3){border-bottom:1px solid var(--line)}}
@media(max-width:520px){.facts{grid-template-columns:repeat(2,1fr)} .facts>div{border-right:1px solid var(--line)!important;border-bottom:1px solid var(--line)} .facts>div:nth-child(2n){border-right:0!important}}

/* care grid */
.care{display:grid;grid-template-columns:repeat(2,1fr);gap:clamp(20px,3vw,36px)}
@media(max-width:760px){.care{grid-template-columns:1fr}}
.care article{display:flex;flex-direction:column;gap:12px;padding-top:18px;border-top:2px solid var(--water)}
.care article p{color:var(--ink-2)}
.care ul{margin:0;padding-left:18px;color:var(--ink-2);display:flex;flex-direction:column;gap:6px}
.care li strong{color:var(--ink)}
.callout{background:var(--water-tint);border-left:3px solid var(--water);padding:16px 20px;border-radius:0 6px 6px 0;color:var(--ink-2);margin-top:8px}
.callout strong{color:var(--ink)}

/* anatomy */
.anatomy{display:grid;grid-template-columns:1.2fr .8fr;gap:clamp(24px,4vw,56px);align-items:center}
@media(max-width:860px){.anatomy{grid-template-columns:1fr}}
.anatomy svg{width:100%;height:auto}
.anatomy .label{font-family:"IBM Plex Mono",monospace;font-size:11px;fill:var(--ink)}
.anatomy .label.jp{fill:var(--mute);font-family:"Shippori Mincho",serif;font-size:11px}
.anatomy .lead{stroke:var(--mute);stroke-width:1;fill:none}
.anatomy .pt{fill:var(--water)}
.anat-list{display:flex;flex-direction:column;gap:0;border-top:1px solid var(--line)}
.anat-list div{display:grid;grid-template-columns:32px 1fr;gap:14px;padding:12px 0;border-bottom:1px solid var(--line)}
.anat-list .n{font-family:"IBM Plex Mono",monospace;color:var(--water);font-size:.85rem;padding-top:2px}
.anat-list b{display:block}
.anat-list span{color:var(--ink-2);font-size:.95rem}

/* varieties */
.vars{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
@media(max-width:900px){.vars{grid-template-columns:repeat(2,1fr)}}
.var{background:var(--card);border:1px solid var(--line);border-radius:8px;overflow:hidden;display:flex;flex-direction:column}
.var .swatch{aspect-ratio:4/3;background:var(--water-tint);display:grid;place-items:center}
.var .swatch svg{width:78%;height:auto}
.var .txt{padding:14px 16px 16px;display:flex;flex-direction:column;gap:6px}
.var .txt b{font-family:"Shippori Mincho",serif;font-size:1.1rem;font-weight:500}
.var .txt i{font-style:normal;color:var(--mute);font-size:.8rem;font-family:"Shippori Mincho",serif;letter-spacing:.08em}
.var .txt p{color:var(--ink-2);font-size:.92rem}

/* styles compare */
.compare{display:grid;grid-template-columns:1fr 1fr;gap:clamp(18px,3vw,36px)}
@media(max-width:760px){.compare{grid-template-columns:1fr}}
.compare article{padding:24px;border:1px solid var(--line);border-radius:8px;background:var(--card);display:flex;flex-direction:column;gap:12px}
.compare article h3{display:flex;align-items:baseline;gap:10px}
.compare article h3 small{font-family:"IBM Plex Mono",monospace;font-size:.7rem;letter-spacing:.12em;color:var(--mute);font-weight:400}
.compare dl{margin:0;display:grid;grid-template-columns:auto 1fr;gap:6px 16px;font-size:.95rem}
.compare dt{color:var(--mute)}
.compare dd{margin:0;color:var(--ink-2)}

/* stages */
.stages{display:grid;grid-template-columns:repeat(3,1fr);gap:0;border:1px solid var(--line);border-radius:8px;overflow:hidden;background:var(--card)}
@media(max-width:760px){.stages{grid-template-columns:1fr}}
.stage{padding:24px;border-right:1px solid var(--line);display:flex;flex-direction:column;gap:10px;position:relative}
.stage:last-child{border-right:0}
@media(max-width:760px){.stage{border-right:0;border-bottom:1px solid var(--line)} .stage:last-child{border-bottom:0}}
.stage .kanji{font-family:"Shippori Mincho",serif;font-size:2.2rem;color:var(--water);line-height:1}
.stage b{font-family:"Shippori Mincho",serif;font-size:1.25rem;font-weight:500}
.stage .age{font-family:"IBM Plex Mono",monospace;font-size:.78rem;color:var(--mute);letter-spacing:.06em}
.stage p{color:var(--ink-2);font-size:.95rem}
.stage svg{width:110px;height:auto;align-self:flex-end;margin-top:auto}

/* calculator */
.calc{display:grid;grid-template-columns:1fr 1fr;gap:clamp(20px,4vw,48px);align-items:start}
@media(max-width:820px){.calc{grid-template-columns:1fr}}
.calc form{display:grid;grid-template-columns:1fr 1fr;gap:14px;background:var(--card);border:1px solid var(--line);border-radius:8px;padding:22px}
.calc label{display:flex;flex-direction:column;gap:6px;font-size:.82rem;color:var(--mute);letter-spacing:.03em}
.calc input,.calc select{font:inherit;font-family:"IBM Plex Mono",monospace;padding:10px 12px;border:1px solid var(--line);border-radius:6px;background:var(--paper);color:var(--ink);width:100%}
.calc .full{grid-column:1/-1}
.seg{display:flex;border:1px solid var(--line);border-radius:6px;overflow:hidden}
.seg button{flex:1;padding:9px;background:transparent;border:0;font:inherit;color:var(--ink-2);cursor:pointer;font-weight:500}
.seg button[aria-pressed="true"]{background:var(--water);color:var(--paper)}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]) .seg button[aria-pressed="true"]{color:#0F1A19}}
:root[data-theme="dark"] .seg button[aria-pressed="true"]{color:#0F1A19}
.result{display:flex;flex-direction:column;gap:18px}
.result .big{display:flex;align-items:baseline;gap:14px}
.result .big b{font-family:"Shippori Mincho",serif;font-size:4.2rem;font-weight:500;line-height:1;color:var(--water);font-variant-numeric:tabular-nums}
.result .big span{color:var(--ink-2);font-size:1.05rem}
.result table{border-collapse:collapse;width:100%;font-size:.95rem}
.result td{padding:9px 0;border-bottom:1px solid var(--line)}
.result td:last-child{text-align:right;font-family:"IBM Plex Mono",monospace;font-variant-numeric:tabular-nums}
.result .note{font-size:.88rem;color:var(--mute)}
.verdict{padding:12px 14px;border-radius:6px;font-size:.92rem;background:var(--water-tint);color:var(--ink)}
.verdict.warn{background:#F8E3D3;color:#5E2C10}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]) .verdict.warn{background:#3A2113;color:#F5C9AA}}
:root[data-theme="dark"] .verdict.warn{background:#3A2113;color:#F5C9AA}

/* buying */
.buy{display:grid;grid-template-columns:1fr 1fr;gap:clamp(20px,4vw,48px)}
@media(max-width:760px){.buy{grid-template-columns:1fr}}
.checklist{list-style:none;margin:0;padding:0;display:flex;flex-direction:column}
.checklist li{display:grid;grid-template-columns:22px 1fr;gap:12px;padding:12px 0;border-bottom:1px solid var(--line);color:var(--ink-2)}
.checklist li b{color:var(--ink)}
.checklist svg{width:18px;height:18px;margin-top:4px}
.price{border:1px solid var(--line);border-radius:8px;background:var(--card);overflow:hidden}
.price table{width:100%;border-collapse:collapse;font-size:.95rem}
.price th{text-align:left;font-weight:500;color:var(--mute);font-size:.78rem;letter-spacing:.08em;text-transform:uppercase;padding:12px 16px;border-bottom:1px solid var(--line)}
.price td{padding:12px 16px;border-bottom:1px solid var(--line);color:var(--ink-2)}
.price tr:last-child td{border-bottom:0}
.price td:last-child,.price th:last-child{text-align:right;font-family:"IBM Plex Mono",monospace;font-variant-numeric:tabular-nums}
.price td:first-child{color:var(--ink);font-weight:500}

/* faq */
.faq{display:flex;flex-direction:column;border-top:1px solid var(--line);max-width:760px}
.faq details{border-bottom:1px solid var(--line)}
.faq summary{cursor:pointer;padding:18px 0;font-family:"Shippori Mincho",serif;font-size:1.15rem;list-style:none;display:flex;justify-content:space-between;gap:16px;align-items:center}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-family:"IBM Plex Mono",monospace;color:var(--water);font-size:1.3rem}
.faq details[open] summary::after{content:"–"}
.faq .a{padding:0 0 20px;color:var(--ink-2);max-width:62ch}

/* glossary */
.gloss{columns:2;column-gap:40px;max-width:900px}
@media(max-width:700px){.gloss{columns:1}}
.gloss dl{margin:0}
.gloss div{break-inside:avoid;padding:10px 0;border-bottom:1px solid var(--line)}
.gloss dt{font-weight:700;display:inline}
.gloss dt i{font-style:normal;font-family:"Shippori Mincho",serif;color:var(--mute);font-weight:400;margin-left:6px}
.gloss dd{margin:2px 0 0;color:var(--ink-2);font-size:.95rem}

/* footer */
footer{border-top:1px solid var(--line);padding:40px 0 48px;color:var(--mute);font-size:.88rem}
footer .wrap{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;align-items:center}
footer .brand{font-size:1.05rem}

/* ---- multi-page additions ---- */
.crumbs{font-family:"IBM Plex Mono",monospace;font-size:.74rem;letter-spacing:.06em;color:var(--mute);display:flex;gap:8px;flex-wrap:wrap;margin-bottom:14px}
.crumbs a{color:var(--mute);text-decoration:none}
.crumbs a:hover{color:var(--water)}
.page-head{padding:clamp(40px,6vw,72px) 0 clamp(24px,4vw,40px)}
.page-head h1{font-size:clamp(2.2rem,5vw,3.6rem)}
.page-head .lede{color:var(--ink-2);max-width:62ch;font-size:1.12rem;margin-top:16px}
section.first{border-top:0;padding-top:0}
.article{max-width:66ch;display:flex;flex-direction:column;gap:18px;color:var(--ink-2)}
.article h2{font-size:1.6rem;color:var(--ink);margin-top:18px}
.article h3{color:var(--ink);margin-top:6px}
.article p strong{color:var(--ink)}
.article ul,.article ol{margin:0;padding-left:22px;display:flex;flex-direction:column;gap:8px}
.article li strong{color:var(--ink)}
.article .callout{margin:4px 0}
.meta{font-family:"IBM Plex Mono",monospace;font-size:.74rem;letter-spacing:.06em;color:var(--mute);text-transform:uppercase}
.related{border-top:1px solid var(--line);padding-top:28px;margin-top:48px;display:flex;flex-direction:column;gap:14px}
.related h2{font-size:1.2rem}
.related ul{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:10px 24px}
.related a{text-decoration:none;color:var(--ink);font-weight:500;display:flex;gap:8px;align-items:baseline}
.related a::before{content:"→";color:var(--water);font-family:"IBM Plex Mono",monospace}
.related a:hover{color:var(--water)}
.teasers{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
@media(max-width:860px){.teasers{grid-template-columns:repeat(2,1fr)}}
@media(max-width:560px){.teasers{grid-template-columns:1fr}}
.teaser{display:flex;flex-direction:column;gap:8px;padding:22px 22px 24px;background:var(--card);border:1px solid var(--line);border-radius:8px;text-decoration:none;color:var(--ink)}
.teaser:hover{border-color:var(--water)}
.teaser b{font-family:"Shippori Mincho",serif;font-size:1.25rem;font-weight:500}
.teaser p{color:var(--ink-2);font-size:.95rem}
.teaser .go{margin-top:auto;padding-top:10px;color:var(--water);font-weight:700;font-size:.9rem}
.qlist{display:grid;grid-template-columns:repeat(2,1fr);gap:12px 32px;max-width:900px}
@media(max-width:700px){.qlist{grid-template-columns:1fr}}
.qlist a{font-family:"Shippori Mincho",serif;font-size:1.12rem;text-decoration:none;color:var(--ink);padding:12px 0;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;gap:12px}
.qlist a::after{content:"→";color:var(--water);font-family:"IBM Plex Mono",monospace}
.qlist a:hover{color:var(--water)}
footer nav.foot{position:static;background:none;border:0;backdrop-filter:none}
footer .foot ul{list-style:none;margin:0;padding:0;display:flex;gap:16px;flex-wrap:wrap;font-size:.85rem}
footer .foot a{color:var(--mute);text-decoration:none}
footer .foot a:hover{color:var(--water)}
@media(max-width:760px){nav.top ul{display:flex;gap:14px;font-size:.85rem} nav.top .wrap{height:auto;padding-top:10px;padding-bottom:10px;flex-wrap:wrap}}