:root {
  /* Technical palette: blue-grey with muted teal */
  --bg: #eef2f5;
  --bg-alt: #e1e8ee;
  --card: #f8fafb;
  --tile: #f8fafb;
  --text: #17283a;
  --muted: #526273;
  --line: #cbd5de;
  --accent: #2f7f86;
  --accent-text: #226a71;
  --blue: #3d6d99;
  --btn-bg: #1f3a52;
  --btn-text: #eef2f5;
  --grid: rgba(23, 40, 58, .06);
  --glow: rgba(47, 127, 134, .16);
  --shadow: rgba(20, 40, 60, .14);
  --foot-bg: #14283a;
  --foot-text: #b8c6d3;
  --radius: 16px;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1c29;
    --bg-alt: #13263a;
    --card: #172a3c;
    --text: #e6edf3;
    --muted: #9db0c1;
    --line: #26394d;
    --accent: #4fb3b8;
    --accent-text: #6cc5c9;
    --blue: #7fa9d3;
    --btn-bg: #e6edf3;
    --btn-text: #14283a;
    --grid: rgba(230, 237, 243, .05);
    --glow: rgba(79, 179, 184, .18);
    --shadow: rgba(0, 0, 0, .45);
    --foot-bg: #0a141e;
  }
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 88px; }
body { margin: 0; font-family: var(--font); color: var(--text); background: var(--bg); line-height: 1.6; -webkit-font-smoothing: antialiased; }
img, svg { max-width: 100%; }
a { color: inherit; }
.wrap { width: min(1120px, 100% - 40px); margin-inline: auto; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--btn-bg); color: var(--btn-text); padding: 8px 14px; border-radius: 8px; z-index: 100; }
.skip:focus { left: 8px; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; border-radius: 6px; }

/* Header */
.site-header { position: fixed; inset: 0 0 auto 0; z-index: 50; transition: background .25s, box-shadow .25s; }
.site-header.scrolled { background: color-mix(in srgb, var(--bg) 90%, transparent); backdrop-filter: blur(10px); box-shadow: 0 1px 0 var(--line); }
.bar { display: flex; align-items: center; justify-content: space-between; height: 80px; }
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; color: var(--text); font-weight: 700; font-size: 1.15rem; }
.brand-text { text-transform: uppercase; letter-spacing: .08em; font-size: 1.05rem; }
.brand-mark { display: grid; place-items: center; width: 56px; height: 56px; padding: 4px; border-radius: 12px; background: var(--tile); border: 1px solid var(--line); flex: none; }
.brand-mark img { display: block; width: 100%; height: 100%; }
.nav { display: flex; align-items: center; gap: 28px; }
.nav a { color: var(--muted); text-decoration: none; font-weight: 500; font-size: .95rem; }
.nav a:hover { color: var(--text); }
.nav .nav-cta { background: var(--btn-bg); color: var(--btn-text); padding: 9px 20px; border-radius: 999px; font-weight: 600; }
.nav .nav-cta:hover { color: var(--btn-text); filter: brightness(1.2); }
.nav-toggle { display: none; background: none; border: 0; width: 44px; height: 44px; cursor: pointer; padding: 10px; }
.nav-toggle span { display: block; height: 2px; background: var(--text); margin: 6px 0; border-radius: 2px; }

/* Hero */
.hero {
  position: relative; padding: 170px 0 120px; overflow: hidden;
  background:
    radial-gradient(800px 460px at 88% 8%, var(--glow), transparent 62%),
    linear-gradient(var(--grid) 1px, transparent 1px) 0 0 / 48px 48px,
    linear-gradient(90deg, var(--grid) 1px, transparent 1px) 0 0 / 48px 48px,
    var(--bg);
}
.hero-grid { position: relative; z-index: 1; display: grid; grid-template-columns: 1fr auto; gap: 56px; align-items: center; }
.hero-inner { position: relative; z-index: 1; max-width: 780px; }
.hero-logo { background: var(--tile); border: 1px solid var(--line); border-radius: 28px; padding: 14px; box-shadow: 0 24px 56px var(--shadow); }
.hero-logo img { display: block; width: 260px; height: auto; }
.eyebrow { margin: 0 0 14px; text-transform: uppercase; letter-spacing: .16em; font-size: .78rem; font-weight: 700; color: var(--accent-text); }
h1 { margin: 0 0 20px; font-size: clamp(2.3rem, 6vw, 3.4rem); line-height: 1.08; letter-spacing: -.02em; }
h1 span { color: var(--accent); }
.lead { font-size: clamp(1.05rem, 2vw, 1.3rem); color: var(--muted); max-width: 620px; margin: 0 0 34px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; }
.btn { display: inline-flex; align-items: center; gap: 10px; padding: 14px 26px; border-radius: 999px; font-weight: 600; text-decoration: none; transition: transform .15s, filter .15s, background .15s; }
.btn svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.btn-primary { background: var(--btn-bg); color: var(--btn-text); }
.btn-primary:hover { filter: brightness(1.25); transform: translateY(-1px); }
.btn-ghost { border: 1px solid var(--line); color: var(--text); background: var(--card); }
.btn-ghost:hover { border-color: var(--accent); }

/* Sections */
.section { padding: 96px 0; }
.section.alt { background: var(--bg-alt); }
.section-head { max-width: 640px; margin-bottom: 48px; }
h2 { margin: 0 0 14px; font-size: clamp(1.7rem, 3.5vw, 2.5rem); line-height: 1.15; letter-spacing: -.015em; }
.section-head p, .split p { color: var(--muted); font-size: 1.05rem; }

.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 22px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 28px; transition: transform .2s, box-shadow .2s, border-color .2s; }
.card:hover { transform: translateY(-4px); border-color: var(--accent); box-shadow: 0 14px 34px var(--shadow); }
.icon { display: grid; place-items: center; width: 52px; height: 52px; border-radius: 14px; background: color-mix(in srgb, var(--accent) 14%, transparent); color: var(--accent-text); margin-bottom: 20px; }
.icon.sm { width: 44px; height: 44px; margin: 0; flex: none; }
.icon svg { width: 26px; height: 26px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.icon.sm svg { width: 22px; height: 22px; }
.card h3 { margin: 0 0 14px; font-size: 1.2rem; line-height: 1.3; }
.card ul { list-style: none; margin: 0; padding: 0; color: var(--muted); }
.card li { position: relative; padding: 5px 0 5px 20px; }
.card li::before { content: ""; position: absolute; left: 0; top: 14px; width: 8px; height: 8px; border-radius: 50%; background: var(--accent); }

.split { display: grid; grid-template-columns: 1.1fr 1fr; gap: 56px; align-items: start; }
.facts { list-style: none; margin: 0; padding: 0; display: grid; gap: 14px; }
.facts li { background: var(--card); border: 1px solid var(--line); border-left: 4px solid var(--accent); border-radius: 12px; padding: 16px 20px; display: grid; }
.facts strong { font-size: 1.05rem; }
.facts span { color: var(--muted); font-size: .95rem; }

/* Contact */
.contact { padding: 96px 0; background: radial-gradient(700px 400px at 8% 100%, var(--glow), transparent 62%), var(--bg); border-top: 1px solid var(--line); }
.contact-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
.contact p { color: var(--muted); font-size: 1.05rem; }
.contact-links { display: grid; gap: 16px; }
.contact-card { display: flex; align-items: center; gap: 16px; padding: 20px 24px; border-radius: var(--radius); background: var(--card); border: 1px solid var(--line); text-decoration: none; font-size: 1.2rem; font-weight: 600; transition: border-color .2s, transform .2s, box-shadow .2s; overflow-wrap: anywhere; }
.contact-card:hover { border-color: var(--accent); transform: translateY(-2px); box-shadow: 0 12px 28px var(--shadow); }
.contact-card small { display: block; font-size: .75rem; letter-spacing: .12em; text-transform: uppercase; color: var(--accent-text); font-weight: 700; }

/* Footer */
.site-footer { background: var(--foot-bg); color: var(--foot-text); padding: 28px 0; font-size: .9rem; }
.foot { display: flex; flex-wrap: wrap; gap: 12px 28px; justify-content: space-between; }
.site-footer nav { display: flex; gap: 22px; }
.site-footer a { text-decoration: none; }
.site-footer a:hover { color: #fff; }

/* Reveal */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: none; }
.card.reveal.in:hover { transform: translateY(-4px); }

@media (max-width: 960px) { .hero-grid { grid-template-columns: 1fr; } }
@media (max-width: 820px) {
  .nav-toggle { display: block; }
  .nav { position: absolute; top: 80px; left: 0; right: 0; flex-direction: column; align-items: stretch; gap: 0; background: var(--bg); padding: 8px 20px 20px; display: none; border-bottom: 1px solid var(--line); }
  .nav.open { display: flex; }
  .nav a { padding: 14px 0; border-bottom: 1px solid var(--line); color: var(--text); }
  .nav .nav-cta { text-align: center; margin-top: 14px; border: 0; color: var(--btn-text); }
  .site-header { background: var(--bg); box-shadow: 0 1px 0 var(--line); }
  .hero { padding: 130px 0 90px; }
  .section, .contact { padding: 72px 0; }
  .split, .contact-inner { grid-template-columns: 1fr; gap: 32px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}

/* ---------- Extras: pipes, marquee, steps, effects ---------- */
.hero > .wrap { position: relative; z-index: 1; }
.pipes { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; z-index: 0; }
.pipe-base path, .pipe-flow path { fill: none; stroke-linejoin: round; stroke-linecap: round; }
.pipe-base path { stroke: var(--accent); stroke-width: 2; opacity: .22; }
.pipe-flow path { stroke: var(--accent); stroke-width: 2.5; stroke-dasharray: 3 22; opacity: .6; animation: flow 3.2s linear infinite; }
.pipe-nodes circle { fill: var(--bg); stroke: var(--accent); stroke-width: 2; opacity: .55; }
@keyframes flow { to { stroke-dashoffset: -100; } }

.hero-inner > * { animation: rise .8s cubic-bezier(.2,.7,.2,1) both; }
.hero-inner > :nth-child(2) { animation-delay: .08s; }
.hero-inner > :nth-child(3) { animation-delay: .16s; }
.hero-inner > :nth-child(4) { animation-delay: .24s; }
.hero-logo { animation: rise .9s .2s cubic-bezier(.2,.7,.2,1) both; transition: transform .35s ease; }
.hero-logo:hover { transform: rotate(-2deg) scale(1.03); }
@keyframes rise { from { opacity: 0; transform: translateY(22px); } to { opacity: 1; transform: none; } }

.marquee { background: var(--btn-bg); color: var(--btn-text); overflow: hidden; padding: 16px 0; border-block: 1px solid var(--line); }
.marquee .track { display: flex; width: max-content; animation: scroll 55s linear infinite; }
.marquee:hover .track { animation-play-state: paused; }
.marquee .set { display: flex; flex: none; }
.marquee span { display: inline-flex; align-items: center; white-space: nowrap; padding-right: 28px; font-size: .95rem; letter-spacing: .04em; text-transform: uppercase; font-weight: 600; }
.marquee span::after { content: ""; width: 8px; height: 8px; margin-left: 28px; background: var(--accent); transform: rotate(45deg); }
@keyframes scroll { to { transform: translateX(-50%); } }

.card { position: relative; overflow: hidden; isolation: isolate; }
.card::after { content: ""; position: absolute; inset: 0; z-index: -1; opacity: 0; transition: opacity .25s; background: radial-gradient(320px circle at var(--mx, 50%) var(--my, 0%), color-mix(in srgb, var(--accent) 16%, transparent), transparent 70%); }
.card:hover::after { opacity: 1; }
.card .num { position: absolute; top: 18px; right: 22px; font-size: 2.6rem; font-weight: 800; line-height: 1; letter-spacing: -.04em; color: transparent; -webkit-text-stroke: 1.5px color-mix(in srgb, var(--accent) 45%, transparent); transition: -webkit-text-stroke-color .25s; }
.card:hover .num { -webkit-text-stroke-color: var(--accent); }

.steps { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(5, 1fr); gap: 22px; position: relative; counter-reset: s; }
.steps::before { content: ""; position: absolute; top: 23px; left: 24px; right: calc((100% - 88px) / 5 - 24px); height: 2px; background: var(--line); }
.steps::after { content: ""; position: absolute; top: 23px; left: 24px; right: calc((100% - 88px) / 5 - 24px); height: 2px; background: var(--accent); transform-origin: left; transform: scaleX(0); transition: transform 1.4s cubic-bezier(.4,0,.2,1) .2s; }
.steps.in::after { transform: scaleX(1); }
.steps li { position: relative; z-index: 1; }
.steps .dot { display: grid; place-items: center; width: 48px; height: 48px; border-radius: 50%; background: var(--card); border: 2px solid var(--accent); color: var(--accent-text); font-weight: 800; margin-bottom: 18px; transition: background .3s, color .3s, transform .3s; }
.steps li:hover .dot { background: var(--accent); color: var(--card); transform: scale(1.08); }
.steps h3 { margin: 0 0 8px; font-size: 1.15rem; }
.steps p { margin: 0; color: var(--muted); font-size: .98rem; }

.contact { background: radial-gradient(700px 400px at 8% 100%, var(--glow), transparent 62%), var(--bg-alt); }
.nav a.active:not(.nav-cta) { color: var(--text); box-shadow: 0 2px 0 var(--accent); padding-bottom: 4px; }

@media (max-width: 820px) {
  .steps { grid-template-columns: 1fr; gap: 0; }
  .steps::before, .steps::after { top: 24px; bottom: 24px; left: 23px; right: auto; width: 2px; height: auto; }
  .steps::after { height: calc(100% - 48px); width: 2px; transform-origin: top; transform: scaleY(0); }
  .steps.in::after { transform: scaleY(1); }
  .steps li { padding: 0 0 28px 70px; }
  .steps li:last-child { padding-bottom: 0; }
  .steps .dot { position: absolute; left: 0; top: 0; margin: 0; }
  .pipes { opacity: .7; }
}
@media (prefers-reduced-motion: reduce) {
  .pipe-flow path, .marquee .track, .hero-inner > *, .hero-logo { animation: none !important; }
  .marquee .track { flex-wrap: wrap; width: auto; }
  .steps::after { transition: none; transform: scaleX(1); }
}

/* ---------- Technical drawings ---------- */
.dw { overflow: visible; }
.dw .wall { fill: none; stroke: var(--text); stroke-width: 5; stroke-linejoin: miter; }
.dw .wall-i { stroke-width: 3.5; }
.dw .fix, .dw .door { fill: none; stroke: var(--muted); stroke-width: 1.5; }
.dw .fix { fill: color-mix(in srgb, var(--card) 70%, transparent); }
.dw .fix path, .dw .fix circle, .dw .fix ellipse { fill: none; }
.dw .win rect { fill: var(--card); stroke: var(--text); stroke-width: 1.5; }
.dw .p { fill: none; stroke-linejoin: round; stroke-linecap: round; }
.dw .p-water { stroke: var(--accent); stroke-width: 3.2; }
.dw .p-heat { stroke: var(--blue); stroke-width: 3.2; }
.dw .p-sewer { stroke: var(--text); stroke-width: 3; stroke-dasharray: 10 5; opacity: .7; stroke-linecap: butt; }
.dw .joint circle { fill: var(--card); stroke: var(--text); stroke-width: 1.5; }
.dw .dim path { fill: none; stroke: var(--muted); stroke-width: 1; }
.dw text { font: 11px var(--font); fill: var(--muted); letter-spacing: .04em; }
.dw .tag { fill: var(--accent-text); font-weight: 700; font-size: 10px; letter-spacing: 0; }
.dw .ttl { font-size: 10px; font-weight: 700; fill: var(--text); letter-spacing: .1em; }
.dw .frame { fill: none; stroke: var(--line); stroke-width: 1.5; }
.dw .cl { fill: none; stroke: var(--accent-text); stroke-width: 1; stroke-dasharray: 10 3 2 3; opacity: .8; }
.dw .pipe-o { fill: none; stroke: var(--accent); stroke-width: 12; stroke-linejoin: round; stroke-linecap: butt; }
.dw .pipe-i { fill: none; stroke: var(--card); stroke-width: 6; stroke-linejoin: round; stroke-linecap: butt; }
.dw .valve path { fill: var(--card); stroke: var(--text); stroke-width: 1.5; stroke-linejoin: round; }
.js .dw .p-draw { stroke-dasharray: 1; stroke-dashoffset: 1; transition: stroke-dashoffset 2.4s cubic-bezier(.4,0,.2,1); }
.js .plan.in .p-draw { stroke-dashoffset: 0; }

.paper-grid { background: linear-gradient(var(--grid) 1px, transparent 1px) 0 0 / 24px 24px, linear-gradient(90deg, var(--grid) 1px, transparent 1px) 0 0 / 24px 24px, var(--card); }
.plan { margin: 0; padding: 18px 18px 14px; border: 1px solid var(--line); border-radius: 20px; box-shadow: 0 18px 44px var(--shadow); }
.plan svg { display: block; width: 100%; height: auto; }
.plan figcaption { display: flex; flex-wrap: wrap; gap: 6px 20px; margin-top: 12px; padding-top: 12px; border-top: 1px dashed var(--line); font-size: .82rem; color: var(--muted); }
.plan figcaption strong { flex-basis: 100%; color: var(--text); font-weight: 600; }
.plan .lg { display: inline-flex; align-items: center; gap: 8px; }
.plan .lg::before { content: ""; width: 26px; height: 3px; border-radius: 2px; background: var(--c); }
.plan .lg.sew::before { background: repeating-linear-gradient(90deg, var(--text) 0 8px, transparent 8px 12px); opacity: .7; }

.about-text .facts { margin-top: 28px; grid-template-columns: 1fr 1fr; }
.about-text .facts li { padding: 12px 16px; }
.about-text .facts span { font-size: .88rem; }

.hero-visual { position: relative; width: 420px; height: 360px; }
.hero-visual .hero-logo { position: absolute; left: 0; bottom: -22px; z-index: 1; padding: 12px; border-radius: 24px; }
.hero-visual .hero-logo img { width: 220px; }
.hero-sheet { position: absolute; top: 0; right: 0; width: 310px; height: 312px; border: 1px solid var(--line); border-radius: 18px; box-shadow: 0 18px 40px var(--shadow); transform: rotate(4deg); animation: sheetin .9s .3s cubic-bezier(.2,.7,.2,1) both; }
.hero-sheet svg { display: block; width: 100%; height: 100%; }
@keyframes sheetin { from { opacity: 0; transform: translateY(40px) rotate(9deg); } to { opacity: 1; transform: rotate(4deg); } }
@media (max-width: 1080px) { .hero-visual { display: none; } .hero-grid { grid-template-columns: 1fr; } }
@media (prefers-reduced-motion: reduce) { .hero-sheet { animation: none !important; } .js .dw .p-draw { transition: none; } }

/* process diagram */
.dw .sm { stroke-width: 3; }
.dw .ttl.s { font-size: 8px; letter-spacing: .06em; }
.dw .fl { fill: none; stroke: var(--card); stroke-width: 1.3; stroke-dasharray: 2 10; stroke-linecap: round; animation: flow2 1.8s linear infinite; }
@keyframes flow2 { to { stroke-dashoffset: -12; } }
.dw .eq, .dw g.eq > * { fill: var(--card); stroke: var(--text); stroke-width: 1.8; stroke-linejoin: round; }
.dw .eqi { fill: none; stroke: var(--muted); stroke-width: 1.2; }
.dw .memb { fill: color-mix(in srgb, var(--accent) 30%, transparent); stroke: var(--text); stroke-width: 1.2; }
.dw .gauge circle { fill: var(--card); stroke: var(--text); stroke-width: 1.4; }
.dw .gauge path { fill: none; stroke: var(--text); stroke-width: 1.2; }
.dw .arr path { fill: var(--text); }
@media (prefers-reduced-motion: reduce) { .dw .fl { animation: none; } }

@media (max-width: 1000px) {
  .steps { grid-template-columns: 1fr; gap: 0; }
  .steps::before, .steps::after { top: 24px; bottom: 24px; left: 23px; right: auto; width: 2px; height: auto; }
  .steps::after { height: calc(100% - 48px); transform-origin: top; transform: scaleY(0); }
  .steps.in::after { transform: scaleY(1); }
  .steps li { padding: 0 0 28px 70px; }
  .steps li:last-child { padding-bottom: 0; }
  .steps .dot { position: absolute; left: 0; top: 0; margin: 0; }
}

/* step cards */
.steps .dot { margin-bottom: 20px; }
.step-card { position: relative; height: calc(100% - 68px); background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 20px 18px 22px; transition: transform .25s, box-shadow .25s, border-color .25s; }
.step-card::before { content: ""; position: absolute; top: -21px; left: 23px; width: 2px; height: 20px; background: var(--accent); }
.step-card::after { content: ""; position: absolute; top: 0; right: 0; width: 46px; height: 46px; background: linear-gradient(225deg, color-mix(in srgb, var(--accent) 16%, transparent) 0 50%, transparent 50%); border-top-right-radius: 14px; }
.steps li:hover .step-card { transform: translateY(-4px); border-color: var(--accent); box-shadow: 0 14px 30px var(--shadow); }
.step-card .icon { width: 46px; height: 46px; margin-bottom: 16px; }
.step-card .icon svg { width: 24px; height: 24px; }
.step-card h3 { margin: 0 0 8px; }
.steps li:nth-child(2) .step-card.reveal { transition-delay: .1s; }
.steps li:nth-child(3) .step-card.reveal { transition-delay: .2s; }
.steps li:nth-child(4) .step-card.reveal { transition-delay: .3s; }
.steps li:nth-child(5) .step-card.reveal { transition-delay: .4s; }
@media (max-width: 1000px) {
  .step-card { height: auto; }
  .step-card::before { display: none; }
  .steps li { padding-bottom: 20px; }
  .steps li:last-child { padding-bottom: 0; }
  .step-card { display: grid; grid-template-columns: auto 1fr; column-gap: 16px; align-items: start; }
  .step-card .icon { grid-row: 1 / span 2; margin: 0; }
}

/* contact extras */
.contact-links { grid-template-columns: 1fr 1fr; }
.contact-card.wide { grid-column: 1 / -1; }
.contact-card:not(.wide) { font-size: 1.05rem; padding: 18px 20px; }
.contact .loc { display: flex; align-items: center; gap: 14px; margin: 26px 0 0; color: var(--text); font-weight: 600; font-size: 1.15rem; }
.contact .loc small { display: block; font-size: .75rem; letter-spacing: .12em; text-transform: uppercase; color: var(--accent-text); font-weight: 700; }
.contact .loc .icon { margin: 0; }
.site-footer nav { flex-wrap: wrap; }
@media (max-width: 560px) { .contact-links { grid-template-columns: 1fr; } }