/* Ecoterva — industrial filter media & incineration equipment
   Plain CSS, no build step. Edit colours in :root. */

:root{
  --ink:#101f2e;
  --ink-2:#2c3f52;
  --muted:#5d7186;
  --line:#e2e8ee;
  --bg:#ffffff;
  --bg-soft:#f5f7f9;
  --bg-deep:#0d1f2d;
  --brand:#0f766e;
  --brand-dark:#0b5c56;
  --accent:#c2703c;
  --radius:14px;
  --shadow:0 1px 2px rgba(16,31,46,.06),0 12px 32px -18px rgba(16,31,46,.28);
  --wrap:1160px;
  --sans:"Inter","Segoe UI",-apple-system,BlinkMacSystemFont,"Helvetica Neue",Arial,"PingFang SC","Microsoft YaHei",sans-serif;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--bg);color:var(--ink-2);
  font-family:var(--sans);font-size:16.5px;line-height:1.65;
  -webkit-font-smoothing:antialiased;
}
img,svg{max-width:100%}
a{color:var(--brand-dark);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3,h4{color:var(--ink);line-height:1.25;margin:0 0 .5em;font-weight:650;letter-spacing:-.015em}
h1{font-size:clamp(2rem,4.4vw,3.15rem)}
h2{font-size:clamp(1.5rem,2.6vw,2.1rem)}
h3{font-size:1.18rem}
p{margin:0 0 1.05em}
ul,ol{margin:0 0 1.1em;padding-left:1.15em}
li{margin-bottom:.4em}
strong{color:var(--ink)}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 24px}
.narrow{max-width:820px}

/* ---------- header ---------- */
.site-head{
  position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);
  backdrop-filter:saturate(160%) blur(10px);border-bottom:1px solid var(--line);
}
.head-inner{display:flex;align-items:center;gap:26px;height:70px}
.logo{display:flex;align-items:center;gap:10px;font-weight:700;font-size:1.18rem;color:var(--ink);letter-spacing:-.02em}
.logo:hover{text-decoration:none}
.logo-mark{width:30px;height:30px;flex:0 0 30px}
.logo small{display:block;font-size:.62rem;letter-spacing:.16em;text-transform:uppercase;color:var(--muted);font-weight:600;line-height:1}
.nav{display:flex;gap:22px;margin-left:auto;align-items:center}
.nav a{color:var(--ink-2);font-size:.94rem;font-weight:500;padding:6px 0;border-bottom:2px solid transparent}
.nav a:hover{color:var(--brand-dark);text-decoration:none;border-bottom-color:var(--brand)}
.nav a[aria-current="page"]{color:var(--brand-dark);border-bottom-color:var(--brand)}
.head-cta{display:flex;gap:10px;align-items:center}
.burger{display:none}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 20px;border-radius:10px;font-weight:600;font-size:.94rem;
  border:1px solid transparent;cursor:pointer;transition:.18s ease;white-space:nowrap;
}
.btn:hover{text-decoration:none;transform:translateY(-1px)}
.btn-primary{background:var(--brand);color:#fff;box-shadow:0 8px 20px -12px rgba(15,118,110,.9)}
.btn-primary:hover{background:var(--brand-dark);color:#fff}
.btn-ghost{background:#fff;color:var(--ink);border-color:var(--line)}
.btn-ghost:hover{border-color:var(--brand);color:var(--brand-dark)}
.btn-light{background:#fff;color:var(--ink)}
.btn-row{display:flex;gap:12px;flex-wrap:wrap;margin-top:26px}

/* ---------- hero ---------- */
.hero{padding:70px 0 62px;background:
  radial-gradient(1200px 420px at 80% -10%,#e8f2f1 0%,rgba(232,242,241,0) 62%),
  linear-gradient(#fff,#fbfcfd);border-bottom:1px solid var(--line)}
.hero-grid{display:grid;grid-template-columns:1.06fr .94fr;gap:56px;align-items:center}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:.74rem;font-weight:700;
  letter-spacing:.14em;text-transform:uppercase;color:var(--brand-dark);
  background:#eaf3f2;border:1px solid #d3e6e4;padding:6px 12px;border-radius:999px;margin-bottom:20px}
.hero h1{margin-bottom:18px}
.hero .lead{font-size:1.09rem;color:var(--ink-2);max-width:56ch}
.hero-art{display:flex;justify-content:center}

/* ---------- stats ---------- */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);
  border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;margin-top:52px}
.stat{background:#fff;padding:22px 20px}
.stat b{display:block;font-size:1.5rem;color:var(--ink);letter-spacing:-.02em;line-height:1.2}
.stat span{font-size:.83rem;color:var(--muted)}

/* ---------- sections ---------- */
.section{padding:74px 0}
.section.soft{background:var(--bg-soft);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.section-head{max-width:720px;margin-bottom:40px}
.section-head p{color:var(--muted);margin-bottom:0}
.section-head.center{margin-left:auto;margin-right:auto;text-align:center}

/* ---------- product cards ---------- */
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.cards.two{grid-template-columns:1fr 1fr}
.cards.four{grid-template-columns:repeat(4,1fr)}
.card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:0 0 22px;box-shadow:var(--shadow);display:flex;flex-direction:column;
  transition:.2s ease;overflow:hidden;
}
.card:hover{transform:translateY(-3px);box-shadow:0 2px 4px rgba(16,31,46,.06),0 22px 40px -24px rgba(16,31,46,.4)}
.card-art{background:linear-gradient(160deg,#f2f6f7,#e9f1f0);border-bottom:1px solid var(--line);
  padding:22px;display:flex;align-items:center;justify-content:center;min-height:158px}
.card-body{padding:22px 24px 0;display:flex;flex-direction:column;flex:1}
.card-body h3{margin-bottom:8px}
.card-body p{font-size:.94rem;color:var(--muted);margin-bottom:16px}
.card-body .more{margin-top:auto;font-weight:600;font-size:.9rem}
.tags{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:14px}
.tag{font-size:.72rem;font-weight:600;letter-spacing:.03em;color:var(--brand-dark);
  background:#eef6f5;border:1px solid #d9eae8;border-radius:999px;padding:3px 9px}

/* ---------- split ---------- */
.split{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center}
.split.rev .split-art{order:-1}
.panel{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow)}

/* ---------- feature list ---------- */
.checks{list-style:none;padding:0;margin:0}
.checks li{position:relative;padding-left:28px;margin-bottom:12px;font-size:.96rem}
.checks li:before{content:"";position:absolute;left:0;top:.34em;width:16px;height:16px;border-radius:50%;
  background:#e6f2f0 url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%230f766e' stroke-width='3.4' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M20 6 9 17l-5-5'/%3E%3C/svg%3E") center/11px no-repeat;border:1px solid #cfe4e1}

/* ---------- tables ---------- */
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius);background:#fff}
table{width:100%;border-collapse:collapse;font-size:.9rem;min-width:620px}
th,td{text-align:left;padding:12px 16px;border-bottom:1px solid var(--line);vertical-align:top}
thead th{background:#f6f8fa;font-size:.76rem;letter-spacing:.07em;text-transform:uppercase;color:var(--muted);font-weight:700;white-space:nowrap}
tbody tr:last-child td{border-bottom:0}
tbody tr:hover{background:#fbfcfd}
td.num{font-variant-numeric:tabular-nums;white-space:nowrap}
.table-note{font-size:.8rem;color:var(--muted);margin-top:10px}

/* ---------- cta band ---------- */
.cta-band{background:var(--bg-deep);color:#d7e3e8;padding:62px 0}
.cta-band h2{color:#fff}
.cta-band p{color:#a9bdc8;max-width:60ch;margin-bottom:0}
.cta-grid{display:flex;align-items:center;justify-content:space-between;gap:40px;flex-wrap:wrap}

/* ---------- prose / article ---------- */
.prose{max-width:760px;font-size:1.02rem}
.prose h2{margin-top:2.1em;font-size:1.55rem}
.prose h3{margin-top:1.7em}
.prose ul,.prose ol{padding-left:1.3em}
.prose blockquote{margin:1.6em 0;padding:16px 22px;border-left:3px solid var(--brand);
  background:var(--bg-soft);border-radius:0 10px 10px 0;color:var(--ink-2)}
.prose table{font-size:.88rem}
.prose .table-wrap{margin:1.5em 0}
.meta{font-size:.85rem;color:var(--muted);margin-bottom:28px;padding-bottom:18px;border-bottom:1px solid var(--line)}
.faq dt{font-weight:650;color:var(--ink);margin-top:1.4em}
.faq dd{margin:.35em 0 0;color:var(--ink-2)}

/* ---------- article list ---------- */
.post-list{display:grid;gap:16px}
.post-item{display:block;background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:22px 24px;transition:.18s ease}
.post-item:hover{text-decoration:none;border-color:#bcd8d4;box-shadow:var(--shadow);transform:translateY(-2px)}
.post-item h3{margin-bottom:6px}
.post-item p{margin:0;color:var(--muted);font-size:.93rem}
.post-item .meta{margin:10px 0 0;padding:0;border:0;font-size:.78rem}

/* ---------- contact ---------- */
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.field{display:flex;flex-direction:column;gap:6px}
.field.full{grid-column:1/-1}
label{font-size:.85rem;font-weight:600;color:var(--ink)}
input,select,textarea{
  font:inherit;font-size:.95rem;padding:11px 13px;border:1px solid var(--line);
  border-radius:9px;background:#fff;color:var(--ink);width:100%;
}
input:focus,select:focus,textarea:focus{outline:2px solid #bfe0dc;border-color:var(--brand);outline-offset:0}
textarea{min-height:120px;resize:vertical}
.contact-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow)}
.contact-row{display:flex;gap:12px;padding:14px 0;border-bottom:1px solid var(--line);font-size:.94rem}
.contact-row:last-child{border-bottom:0}
.contact-row b{display:block;font-size:.75rem;text-transform:uppercase;letter-spacing:.09em;color:var(--muted);font-weight:700}
.notice{background:#fdf6f1;border:1px solid #f0dccd;border-radius:10px;padding:14px 16px;font-size:.86rem;color:#8a5535}

/* ---------- footer ---------- */
.site-foot{background:#0a1926;color:#93a8b5;padding:56px 0 30px;font-size:.9rem}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:36px;padding-bottom:36px;border-bottom:1px solid rgba(255,255,255,.1)}
.site-foot h4{color:#e6eff3;font-size:.78rem;letter-spacing:.1em;text-transform:uppercase;margin-bottom:14px}
.site-foot a{color:#93a8b5}
.site-foot a:hover{color:#fff}
.site-foot ul{list-style:none;padding:0;margin:0}
.site-foot li{margin-bottom:9px}
.site-foot .logo{color:#fff}
.site-foot .logo small{color:#7d94a2}
.foot-bottom{display:flex;justify-content:space-between;gap:20px;padding-top:22px;font-size:.8rem;color:#6f8794;flex-wrap:wrap}
.foot-disc{max-width:640px;font-size:.76rem;color:#5f7683;line-height:1.6;margin-top:14px}

/* ---------- responsive ---------- */
@media (max-width:980px){
  .hero-grid,.split{grid-template-columns:1fr;gap:36px}
  .split.rev .split-art{order:0}
  .cards,.cards.four{grid-template-columns:1fr 1fr}
  .stats{grid-template-columns:1fr 1fr}
  .foot-grid{grid-template-columns:1fr 1fr}
  .nav{display:none}
}
@media (max-width:680px){
  body{font-size:16px}
  .hero{padding:44px 0 40px}
  .section{padding:52px 0}
  .cards,.cards.two,.cards.four,.form-grid{grid-template-columns:1fr}
  .head-inner{height:62px}
  .head-cta .btn-ghost{display:none}
  .foot-grid{grid-template-columns:1fr}
  .logo small{display:none}
}

/* ---------- mobile menu (overrides .nav display:none above) ---------- */
.burger{
  display:none;margin-left:auto;background:#fff;border:1px solid var(--line);
  border-radius:9px;padding:8px 14px;cursor:pointer;
  font-family:inherit;font-size:.9rem;font-weight:600;color:var(--ink);
}
.burger:hover{border-color:var(--brand);color:var(--brand-dark)}
@media (max-width:980px){
  .site-head{position:sticky}
  .burger{display:inline-flex;align-items:center}
  .head-cta{margin-left:0}
  .nav{
    display:none;position:absolute;top:100%;left:0;right:0;background:#fff;
    border-bottom:1px solid var(--line);box-shadow:0 18px 28px -24px rgba(16,31,46,.6);
    flex-direction:column;gap:0;padding:6px 24px 14px;margin-left:0;
  }
  .nav.open{display:flex}
  .nav a{padding:12px 0;border-bottom:1px solid var(--line);font-size:1rem;width:100%}
  .nav a[aria-current="page"]{border-bottom-color:var(--line)}
}