/* Layout: tall water-tower header band, then a product catalogue grid; each product opens its own view by #anchor. */
:root{
  --ink:#0d2640; --fg:#1d3247; --muted:#5a6d80; --bg:#f2f6f8; --surface:#ffffff;
  --line:#d5e0e8; --accent:#1597ae; --accent-ink:#0b6d80; --band:#0d2640; --band-fg:#e6f3f7;
  --plate:#ffffff;
  --display:"Barlow Semi Condensed","Arial Narrow",system-ui,sans-serif;
  --body:"Source Sans 3",system-ui,-apple-system,"Segoe UI",sans-serif;
  --mono:"IBM Plex Mono",ui-monospace,Consolas,monospace;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --ink:#eaf3f7; --fg:#cfdde6; --muted:#8fa4b5; --bg:#0a1a29; --surface:#11263a;
  --line:#21394f; --accent:#3cc0d6; --accent-ink:#6fd3e4; --band:#06121e; --band-fg:#e6f3f7; --plate:#f4f7f9; color-scheme:dark}}
:root[data-theme="dark"]{
  --ink:#eaf3f7; --fg:#cfdde6; --muted:#8fa4b5; --bg:#0a1a29; --surface:#11263a;
  --line:#21394f; --accent:#3cc0d6; --accent-ink:#6fd3e4; --band:#06121e; --band-fg:#e6f3f7; --plate:#f4f7f9; color-scheme:dark}
*{box-sizing:border-box}
body{background:var(--bg);color:var(--fg);font:400 17px/1.6 var(--body);margin:0}
a{color:var(--accent-ink)}
a:focus-visible,button:focus-visible{outline:3px solid var(--accent);outline-offset:3px}
.wrap{max-width:1180px;margin-inline:auto;padding-inline:20px}
h1,h2,h3{font-family:var(--display);color:var(--ink);text-wrap:balance;line-height:1.1;margin:0}
.eyebrow{font:500 12px/1 var(--mono);letter-spacing:.14em;text-transform:uppercase;color:var(--accent-ink)}

/* header */
.top{position:sticky;top:env(safe-area-inset-top,0px);z-index:10;background:color-mix(in srgb,var(--bg) 92%,transparent);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.top .wrap{display:flex;align-items:center;justify-content:space-between;gap:16px;padding-block:10px;flex-wrap:wrap}
.logo{display:inline-flex;background:var(--plate);border-radius:6px;padding:4px 8px}
.logo img{height:38px;width:auto;display:block}
nav{display:flex;gap:4px;flex-wrap:wrap}
nav a{font:600 15px/1 var(--display);letter-spacing:.04em;text-transform:uppercase;color:var(--fg);text-decoration:none;padding:10px 12px;border-radius:4px}
nav a:hover,nav a[aria-current="page"]{color:var(--accent-ink);background:color-mix(in srgb,var(--accent) 12%,transparent)}

/* hero band */
.hero{background:var(--band);color:var(--band-fg);position:relative;overflow:hidden}
.hero canvas{position:absolute;inset:0;width:100%;height:100%;opacity:.55}
.hero .wrap{position:relative;display:grid;grid-template-columns:1.15fr 1fr;gap:40px;padding-block:64px 56px;align-items:center}
.hero h1{color:#fff;font-size:clamp(36px,5.4vw,64px);font-weight:700;letter-spacing:-.01em}
.hero h1 em{font-style:normal;color:#7fdcec}
.hero p{max-width:52ch;color:#c4dbe5;font-size:19px;margin:18px 0 28px}
.hero .eyebrow{color:#7fdcec;margin-bottom:16px;display:block}
.btns{display:flex;gap:12px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:8px;font:600 17px/1 var(--display);letter-spacing:.03em;padding:14px 20px;border-radius:4px;text-decoration:none;border:1.5px solid transparent;cursor:pointer}
.btn.solid{background:#3cc0d6;color:#06121e}
.btn.solid:hover{background:#6fd3e4}
.btn.ghost{border-color:#3d5b74;color:#e6f3f7}
.btn.ghost:hover{border-color:#7fdcec}
.facts{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:#24425c;border:1px solid #24425c;margin-top:36px;max-width:520px}
.facts div{background:var(--band);padding:14px 16px}
.facts b{display:block;font:700 30px/1 var(--display);color:#fff;font-variant-numeric:tabular-nums}
.facts span{font:500 11px/1.3 var(--mono);letter-spacing:.08em;text-transform:uppercase;color:#9cbccb}
.hero-media{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.hero-media figure{margin:0;background:#fff;border-radius:4px;overflow:hidden;aspect-ratio:4/3;max-width:100%}
.hero-media figure:first-child{grid-column:span 2;aspect-ratio:16/9}
.hero-media img{width:100%;height:100%;object-fit:cover;display:block}

/* sections */
section.block{padding-block:72px}
.head{display:flex;justify-content:space-between;align-items:end;gap:24px;flex-wrap:wrap;margin-bottom:32px}
.head h2{font-size:clamp(28px,3.6vw,42px);margin-top:10px}
.head p{max-width:46ch;color:var(--muted);margin:0}

.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:20px}
.card{display:flex;flex-direction:column;background:var(--surface);border:1px solid var(--line);border-radius:6px;overflow:hidden;text-decoration:none;color:inherit;transition:transform .2s,border-color .2s}
.card:hover{transform:translateY(-3px);border-color:var(--accent)}
.card .ph{background:var(--plate);aspect-ratio:3/2;display:flex;align-items:center;justify-content:center;border-bottom:1px solid var(--line)}
.card .ph img{width:100%;height:100%;object-fit:contain}
.card .ph img.cover{object-fit:cover}
.card .tx{padding:16px 18px 18px;display:flex;flex-direction:column;gap:6px;flex:1}
.card .cat{font:500 11px/1 var(--mono);letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}
.card h3{font-size:23px;font-weight:600}
.card p{margin:0;color:var(--muted);font-size:15.5px;line-height:1.5;flex:1}
.card .more{font:600 15px/1 var(--display);letter-spacing:.04em;color:var(--accent-ink);margin-top:8px}

/* about */
.about{background:var(--surface);border-block:1px solid var(--line)}
.split{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
.split > *{min-width:0}
video{width:100%;max-width:100%;border-radius:6px;background:#000;display:block;aspect-ratio:16/9}
.prose p{max-width:62ch;margin:0 0 14px}
.certs{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:24px}
.cert{display:flex;gap:12px;align-items:center;padding:14px 16px;border:1px solid var(--line);border-radius:6px;text-decoration:none;color:var(--fg);background:var(--bg)}
.cert:hover{border-color:var(--accent)}
.cert .seal{flex:none;width:46px;height:46px;border-radius:50%;border:2px solid var(--accent);display:grid;place-items:center;font:700 13px/1 var(--display);color:var(--accent-ink)}
.cert b{display:block;font:600 18px/1.1 var(--display);color:var(--ink)}
.cert small{color:var(--muted);font-size:13px}

/* process strip: how a counterflow tower uses the parts (real order of water path) */
.path{display:grid;grid-template-columns:repeat(4,1fr);gap:0;border:1px solid var(--line);border-radius:6px;overflow:hidden;background:var(--surface)}
.path div{padding:20px;border-left:1px solid var(--line)}
.path div:first-child{border-left:0}
.path .n{font:500 12px/1 var(--mono);color:var(--accent-ink);letter-spacing:.1em}
.path h3{font-size:20px;margin:8px 0 6px}
.path p{margin:0;color:var(--muted);font-size:15px;line-height:1.5}

/* contact */
.contact{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.ci{background:var(--surface);border:1px solid var(--line);border-radius:6px;padding:20px;min-width:0}
.ci .eyebrow{display:block;margin-bottom:10px}
.ci .v{font:600 20px/1.3 var(--display);color:var(--ink);overflow-wrap:anywhere}
.ci .v a{color:inherit;text-decoration:none}
.ci .v a:hover{color:var(--accent-ink)}
.ci table{border-collapse:collapse;font-size:15px;width:100%;font-variant-numeric:tabular-nums}
.ci td{padding:3px 0}.ci td+td{text-align:right;color:var(--ink);font-weight:600}
.copy{margin-top:10px;font:500 12px/1 var(--mono);letter-spacing:.06em;text-transform:uppercase;background:none;border:1px solid var(--line);color:var(--muted);padding:8px 10px;border-radius:4px;cursor:pointer}
.copy:hover{color:var(--accent-ink);border-color:var(--accent)}

/* product detail view */
.crumb{font-size:14px;color:var(--muted);padding-block:24px 0}
.crumb a{text-decoration:none}
.detail{display:grid;grid-template-columns:1.05fr 1fr;gap:48px;padding-block:28px 72px;align-items:start}
.detail > *{min-width:0}
.detail .shot{background:var(--plate);border:1px solid var(--line);border-radius:6px;overflow:hidden}
.detail .shot img{width:100%;display:block}
.detail h1{font-size:clamp(34px,4.6vw,54px);margin:10px 0 20px}
.detail .prose p{font-size:18px}
.aside{margin-top:28px;padding:20px;border:1px solid var(--line);border-left:4px solid var(--accent);background:var(--surface);border-radius:4px}
.aside b{font:600 20px/1.2 var(--display);color:var(--ink);display:block;margin-bottom:6px}
.others{display:flex;flex-wrap:wrap;gap:8px;margin-top:28px}
.others a{font:600 14px/1 var(--display);letter-spacing:.03em;padding:9px 12px;border:1px solid var(--line);border-radius:999px;text-decoration:none;color:var(--fg)}
.others a:hover{border-color:var(--accent);color:var(--accent-ink)}

footer{background:var(--band);color:#9cbccb;font-size:14px}
footer .wrap{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;padding-block:28px}
footer b{color:#fff;font-family:var(--display);font-size:17px;letter-spacing:.04em}

@media (max-width:900px){
  .hero .wrap,.split,.detail{grid-template-columns:1fr}
  .contact{grid-template-columns:1fr 1fr}
  .path{grid-template-columns:1fr 1fr}
  .path div:nth-child(3){border-left:0}
  .path div:nth-child(n+3){border-top:1px solid var(--line)}
}
@media (max-width:560px){
  body{font-size:16px}
  .contact,.certs,.path{grid-template-columns:1fr}
  .path div{border-left:0;border-top:1px solid var(--line)}.path div:first-child{border-top:0}
  .facts b{font-size:24px}
  nav a{padding:8px 8px;font-size:14px}
  section.block{padding-block:52px}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}

/* hero arka plan videosu */
.hero-video{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.55;pointer-events:none}
.hero::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(6,18,30,.9) 0%,rgba(6,18,30,.5) 60%,rgba(6,18,30,.25) 100%);pointer-events:none}
.hero .wrap{z-index:1}
.video-badge{display:inline-flex;align-items:center;gap:8px;margin-top:18px;font:500 12px/1 var(--mono);letter-spacing:.08em;text-transform:uppercase;color:#9cbccb;text-decoration:none}
.video-badge:hover{color:#7fdcec}

/* SEO içerik bölümü */
.seo-body{border-top:1px solid var(--line);padding-block:48px 24px}
.seo-body .prose{max-width:760px}
.seo-body h2{font-size:clamp(24px,2.8vw,32px);margin:32px 0 12px}
.seo-body h2:first-child{margin-top:0}
.ticks{padding-left:0;list-style:none;margin:0 0 14px;display:grid;gap:8px}
.ticks li{padding-left:26px;position:relative}
.ticks li::before{content:"";position:absolute;left:4px;top:.6em;width:10px;height:10px;border-radius:50%;border:2px solid var(--accent)}
.faq{display:grid;gap:10px}
.faq details{border:1px solid var(--line);border-radius:6px;background:var(--surface);padding:14px 18px}
.faq summary{cursor:pointer;font:600 18px/1.3 var(--display);color:var(--ink)}
.faq details p{margin:10px 0 0;color:var(--fg)}