/* ECHIGO Ltda. — site styles
   Palette: white, Echigo red (logo seal), dark navy. */
:root{
  --red:#D1270E;
  --red-deep:#A81E09;
  --navy:#1E293B;
  --steel:#526072;
  --mist:#EEF2F6;
  --rule:#D6DDE6;
  --white:#FFFFFF;
  --maxw:72rem;
  --gutter:clamp(1rem,4vw,2.5rem);
  --font:"Archivo","Zen Kaku Gothic New",system-ui,sans-serif;
  --font-ja:"Zen Kaku Gothic New","Archivo",system-ui,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--white);color:var(--navy);font-family:var(--font);font-size:1.0625rem;line-height:1.6;font-feature-settings:"kern"}
html[lang="ja"] h1,html[lang="ja"] h2,html[lang="ja"] h3{word-break:auto-phrase;line-break:strict}
html[lang="ja"] body{font-family:var(--font-ja);line-height:1.85;letter-spacing:.02em}
img,svg{display:block;max-width:100%;height:auto}
a{color:inherit}
:focus-visible{outline:3px solid var(--red);outline-offset:3px}
.wrap{max-width:var(--maxw);margin-inline:auto;padding-inline:var(--gutter)}
.skip{position:absolute;left:-999px;top:0;background:var(--navy);color:#fff;padding:.5rem 1rem;z-index:20}
.skip:focus{left:1rem}

/* Header */
.site-head{position:sticky;top:0;z-index:10;background:rgba(255,255,255,.96);backdrop-filter:saturate(1.4) blur(6px);border-bottom:1px solid var(--rule)}
.site-head .wrap{display:flex;align-items:center;gap:1.5rem;min-height:4.5rem}
.brand img{width:11.5rem}
.nav{display:flex;gap:1.75rem;margin-left:auto;align-items:center}
.nav a{text-decoration:none;font-size:.95rem;font-weight:500;color:var(--navy);padding:.25rem 0;border-bottom:2px solid transparent}
.nav a:hover,.nav a[aria-current="page"]{border-bottom-color:var(--red)}
.lang{display:flex;gap:.25rem;font-size:.85rem}
.lang a{text-decoration:none;padding:.2rem .45rem;border:1px solid transparent;border-radius:2px;color:var(--steel)}
.lang a[aria-current="true"]{border-color:var(--navy);color:var(--navy);font-weight:600}
.btn{display:inline-flex;align-items:center;gap:.55rem;text-decoration:none;font-weight:600;font-size:1rem;padding:.8rem 1.3rem;border-radius:3px;border:2px solid var(--navy);color:var(--navy);background:transparent;line-height:1.2}
.btn:hover{background:var(--navy);color:#fff}
.btn-red{background:var(--red);border-color:var(--red);color:#fff}
.btn-red:hover{background:var(--red-deep);border-color:var(--red-deep)}
.btn-sm{padding:.5rem .9rem;font-size:.9rem}
.btn svg{width:1.15em;height:1.15em;flex:none}
.menu-btn{display:none;margin-left:auto;background:none;border:2px solid var(--navy);border-radius:3px;padding:.4rem .6rem;font:inherit;font-weight:600;color:var(--navy)}

/* Hero */
.hero{padding:clamp(3rem,7vw,5.5rem) 0 clamp(2.5rem,5vw,4rem)}
.hero .wrap{display:grid;grid-template-columns:1.05fr .95fr;gap:clamp(2rem,5vw,4rem);align-items:center}
.hero h1{font-size:clamp(2.2rem,5.2vw,3.9rem);line-height:1.04;font-weight:700;font-stretch:118%;letter-spacing:-.015em;margin:0 0 1.25rem;max-width:15ch}
html[lang="ja"] .hero h1{font-size:clamp(1.9rem,4.2vw,3rem);line-height:1.3;letter-spacing:0;max-width:17ch;font-weight:700}
.hero p.lead{font-size:clamp(1.05rem,1.6vw,1.25rem);color:var(--steel);max-width:36rem;margin:0 0 2rem}
.cta-row{display:flex;flex-wrap:wrap;gap:.75rem}
.route{width:100%}
.route .arc{fill:none;stroke:var(--navy);stroke-width:2;stroke-linecap:round}
.route .arc-red{stroke:var(--red);stroke-width:2.5}
.route .grid{stroke:var(--rule);stroke-width:1;fill:none}
.route text{font-family:var(--font);font-size:15px;fill:var(--navy)}
.route text.small{font-size:12.5px;fill:var(--steel)}
@media (prefers-reduced-motion:no-preference){
  .route .draw{stroke-dasharray:var(--len);stroke-dashoffset:var(--len);animation:draw 1.8s cubic-bezier(.2,.7,.2,1) forwards}
  .route .draw.d2{animation-delay:.25s}.route .draw.d3{animation-delay:.5s}
  .route .stamp{opacity:0;transform-origin:center;transform-box:fill-box;animation:stamp .45s 1.9s cubic-bezier(.3,1.6,.5,1) forwards}
}
@keyframes draw{to{stroke-dashoffset:0}}
@keyframes stamp{from{opacity:0;transform:scale(1.6) rotate(-8deg)}to{opacity:1;transform:scale(1) rotate(-3deg)}}

/* Facts strip */
.facts{border-top:1px solid var(--rule);border-bottom:1px solid var(--rule)}
.facts ul{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(4,1fr)}
.facts li{padding:1.4rem 1.25rem 1.4rem 0;display:flex;gap:.8rem;align-items:flex-start;font-size:.98rem;line-height:1.4}
.facts li+li{padding-left:1.25rem;border-left:1px solid var(--rule)}
.facts svg{width:1.6rem;height:1.6rem;flex:none;color:var(--red)}
.facts strong{display:block;font-weight:600}
.facts span{color:var(--steel);font-size:.9rem}

/* Sections */
section.block{padding:clamp(3.5rem,7vw,5.5rem) 0}
section.tint{background:var(--mist)}
.h2{font-size:clamp(1.6rem,3vw,2.3rem);font-weight:700;font-stretch:112%;line-height:1.15;letter-spacing:-.01em;margin:0 0 .9rem;max-width:24ch}
html[lang="ja"] .h2{letter-spacing:0;line-height:1.4}
.intro{color:var(--steel);max-width:44rem;margin:0 0 2.5rem;font-size:1.08rem}
.h3{font-size:1.25rem;font-weight:700;margin:0 0 .5rem;line-height:1.3}

/* Offer list (home) */
.offer{display:grid;grid-template-columns:repeat(3,1fr);gap:0;border-top:2px solid var(--navy)}
.offer article{padding:1.75rem 1.5rem 1.75rem 0}
.offer article+article{padding-left:1.5rem;border-left:1px solid var(--rule)}
.offer .ill{height:10rem;margin-bottom:1.25rem}
.offer .ill svg{height:100%;width:auto;max-width:100%}
.offer p{color:var(--steel);margin:0 0 1rem}
.more{font-weight:600;color:var(--red);text-decoration:none;border-bottom:1px solid currentColor}
.more:hover{color:var(--red-deep)}

/* Process (a real sequence) */
.steps{list-style:none;counter-reset:s;margin:0;padding:0;display:grid;grid-template-columns:repeat(5,1fr);gap:1.25rem}
.steps li{counter-increment:s;position:relative;padding-top:3.4rem}
.steps li::before{content:counter(s);position:absolute;top:0;left:0;width:2.4rem;height:2.4rem;border:2px solid var(--red);color:var(--red);font-weight:700;display:grid;place-items:center;transform:rotate(-3deg);font-size:1.05rem;background:var(--white)}
.steps li::after{content:"";position:absolute;top:1.2rem;left:3rem;right:-1.25rem;height:0;border-top:1px dashed var(--steel)}
.steps li:last-child::after{display:none}
.steps strong{display:block;margin-bottom:.3rem}
.steps span{color:var(--steel);font-size:.95rem;line-height:1.5;display:block}

/* CTA band */
.band{background:var(--navy);color:#fff;padding:clamp(3rem,6vw,4.5rem) 0}
.band .wrap{display:grid;grid-template-columns:auto 1fr auto;gap:2rem;align-items:center}
.band .seal{width:5.5rem;transform:rotate(-3deg);border:3px solid #fff;padding:.25rem;background:#fff}
.band h2{font-size:clamp(1.4rem,2.6vw,2rem);margin:0 0 .4rem;font-stretch:112%;line-height:1.2}
.band p{margin:0;color:#C9D2DE}
.band .btn{border-color:#fff;color:#fff}
.band .btn:hover{background:#fff;color:var(--navy)}
.band .btn-red{border-color:var(--red)}

/* Page header */
.page-head{padding:clamp(2.5rem,5vw,4rem) 0 clamp(2rem,4vw,3rem);border-bottom:1px solid var(--rule)}
.page-head h1{font-size:clamp(2rem,4.5vw,3.2rem);font-stretch:118%;font-weight:700;margin:0 0 .75rem;line-height:1.08;letter-spacing:-.015em}
html[lang="ja"] .page-head h1{letter-spacing:0;line-height:1.35}
.page-head p{color:var(--steel);max-width:44rem;margin:0;font-size:1.1rem}

/* Feature rows (products / services) */
.rows{display:grid;gap:clamp(3rem,6vw,4.5rem)}
.row{display:grid;grid-template-columns:minmax(0,.85fr) minmax(0,1.15fr);gap:clamp(1.5rem,4vw,3.5rem);align-items:start}
.row.flip{grid-template-columns:minmax(0,1.15fr) minmax(0,.85fr)}
.row.flip .ill{order:2}
.row .ill{background:var(--mist);border-radius:4px;padding:1.5rem;aspect-ratio:4/3;display:grid;place-items:center}
.row .ill svg{width:100%;height:100%}
.row .h3{font-size:clamp(1.3rem,2vw,1.6rem);font-stretch:108%}
.row ul{margin:.75rem 0 0;padding:0;list-style:none}
.row li{padding:.6rem 0 .6rem 1.4rem;border-bottom:1px solid var(--rule);position:relative}
.row li::before{content:"";position:absolute;left:0;top:1.15rem;width:.55rem;height:.55rem;background:var(--red)}
html[lang="ja"] .row li::before{top:1.3rem}
.row li strong{font-weight:600}
.row p{margin:0 0 .5rem;color:var(--steel)}
.note{font-size:.92rem;color:var(--steel);margin-top:1rem;padding-left:.8rem;border-left:3px solid var(--rule)}
.tag{display:inline-block;font-size:.85rem;font-weight:600;color:var(--red);margin-bottom:.4rem}

/* JIS vs ISO springs */
.springs{display:grid;grid-template-columns:1.1fr .9fr;gap:clamp(2rem,5vw,4rem);align-items:start}
.springs .intro{margin-bottom:1.5rem}
.tbl{overflow-x:auto}
table.spr{width:100%;border-collapse:collapse;font-variant-numeric:tabular-nums}
table.spr th,table.spr td{text-align:left;padding:.75rem .9rem;border-bottom:1px solid var(--rule)}
table.spr thead th{border-bottom:2px solid var(--navy);font-size:.92rem;color:var(--steel);font-weight:600}
table.spr tbody th{font-weight:600;white-space:nowrap}
table.spr td:last-child{color:var(--red);font-weight:600}
.sw{display:inline-block;width:1.6rem;height:.8rem;border-radius:2px;margin-right:.6rem;vertical-align:middle}
.risks{border-top:2px solid var(--navy)}
@media (max-width:960px){.springs{grid-template-columns:1fr}}

/* Parts grid */
.parts{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,15rem),1fr));gap:0;border-top:2px solid var(--navy)}
.parts div{padding:1.25rem 1.25rem 1.25rem 0;border-bottom:1px solid var(--rule)}
.parts strong{display:block;margin-bottom:.25rem}
.parts span{color:var(--steel);font-size:.95rem}

/* About & contact */
.about{display:grid;grid-template-columns:1.1fr .9fr;gap:clamp(2rem,5vw,4rem)}
.about blockquote{margin:0;align-self:start;font-size:clamp(1.15rem,2vw,1.4rem);line-height:1.55;border-left:4px solid var(--red);padding-left:1.25rem}
html[lang="ja"] .about blockquote{line-height:1.9}
.diff{list-style:none;margin:0;padding:0}
.diff li{padding:1rem 0;border-bottom:1px solid var(--rule)}
.diff strong{display:block}
.diff span{color:var(--steel);font-size:.97rem}
.contact{display:grid;grid-template-columns:1fr 1fr;gap:clamp(2rem,5vw,4rem);align-items:start}
.contact dl{margin:0;display:grid;grid-template-columns:auto 1fr;gap:.7rem 1.5rem}
.contact dt{color:var(--steel);font-size:.92rem}
.contact dd{margin:0;font-weight:500}
.contact dd a{text-decoration:none;border-bottom:1px solid var(--rule)}
.contact .actions{display:grid;gap:.75rem;justify-items:start}

/* Footer */
.site-foot{border-top:1px solid var(--rule);padding:2.5rem 0;font-size:.9rem;color:var(--steel)}
.site-foot .wrap{display:grid;grid-template-columns:1fr 1.4fr;gap:1.5rem 3rem;align-items:start}
@media (max-width:820px){.site-foot .wrap{grid-template-columns:1fr}}
.site-foot img{width:9rem;margin-bottom:.75rem}
.site-foot nav{display:flex;gap:1.25rem;flex-wrap:wrap}
.site-foot a{text-decoration:none}
.site-foot a:hover{color:var(--navy)}

/* Floating WhatsApp (mobile) */
.wa-float{position:fixed;right:1rem;bottom:1rem;z-index:9;display:none;width:3.4rem;height:3.4rem;border-radius:50%;background:#1F8F4E;color:#fff;place-items:center;box-shadow:0 4px 14px rgba(30,41,59,.25)}
.wa-float svg{width:1.7rem;height:1.7rem}

/* Responsive */
@media (max-width:960px){
  .hero .wrap{grid-template-columns:1fr}
  .route{max-width:34rem}
  .facts ul{grid-template-columns:1fr 1fr}
  .facts li:nth-child(3){padding-left:0;border-left:0}
  .facts li:nth-child(n+3){border-top:1px solid var(--rule)}
  .offer{grid-template-columns:1fr}
  .offer article+article{padding-left:0;border-left:0;border-top:1px solid var(--rule)}
  .steps{grid-template-columns:1fr;gap:0}
  .steps li{padding:0 0 1.5rem 3.6rem}
  .steps li::after{top:2.6rem;bottom:.2rem;left:1.2rem;right:auto;height:auto;border-top:0;border-left:1px dashed var(--steel)}
  .row,.row.flip{grid-template-columns:1fr}
  .row.flip .ill{order:0}
  .about,.contact{grid-template-columns:1fr}
  .band .wrap{grid-template-columns:1fr}
}
@media (max-width:820px){
  .menu-btn{display:block}
  .nav{display:none;position:absolute;top:100%;left:0;right:0;background:#fff;border-bottom:1px solid var(--rule);flex-direction:column;align-items:flex-start;gap:0;padding:.5rem var(--gutter) 1rem}
  .nav.open{display:flex}
  .nav a{padding:.75rem 0;width:100%;border-bottom:1px solid var(--rule)}
  .site-head .head-wa{display:none}
  .wa-float{display:grid}
  .brand img{width:9.5rem}
}
@media (max-width:520px){
  .facts ul{grid-template-columns:1fr}
  .facts li,.facts li+li{padding:1rem 0;border-left:0}
  .facts li+li{border-top:1px solid var(--rule)}
}