/* NB 家庭用水｜民生站樣式。色票：暖白、淺木色、柔和水藍。 */
:root{
  --bg:#fbf8f3; --paper:#ffffff; --sand:#f3ece1; --wood:#c9a97f; --wood-deep:#8a6a45;
  --water:#5d9db7; --water-deep:#2f6f8a; --water-pale:#e7f2f6;
  --ink:#2c3a40; --muted:#566064; --line:#e9e0d2; --warn-bg:#fff4e2; --warn-line:#e7b866;
  --radius:18px; --shadow:0 10px 30px rgba(60,48,30,.07);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:90px}
body{margin:0;background:var(--bg);color:var(--ink);font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang TC","Noto Sans TC","Microsoft JhengHei",sans-serif;font-size:16px;line-height:1.85}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
h1,h2,h3,p{margin-top:0}
h1,h2,h3{line-height:1.35;letter-spacing:-.02em;color:var(--ink)}
h1{font-size:clamp(34px,4.4vw,58px);font-weight:750;margin-bottom:22px}
h2{font-size:clamp(26px,2.8vw,38px);margin-bottom:18px}
h3{font-size:20px;margin-bottom:10px}
p{color:var(--muted)}
button,input,select{font:inherit}
a:focus-visible,button:focus-visible,summary:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid var(--water);outline-offset:3px}
.wrap{max-width:1200px;margin:auto;padding:0 6%}

/* header */
.header{position:sticky;top:0;z-index:10;background:rgba(251,248,243,.94);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.header .wrap{height:78px;display:flex;align-items:center;justify-content:space-between;gap:20px;max-width:1320px}
.brand{display:flex;align-items:center;gap:12px;white-space:nowrap}
.brandmark{font-size:30px;font-weight:850;color:var(--water-deep);letter-spacing:-2px;position:relative;padding-right:8px;line-height:1}
.brandmark>span{color:var(--wood);position:absolute;font-size:22px;right:-4px;top:-8px}
.brandtext{font-size:15px;font-weight:700;line-height:1.35}
.brandtext>span{display:block;font-size:10px;letter-spacing:.14em;color:var(--muted);font-weight:500;margin-top:3px}
nav{display:flex;align-items:center;gap:22px;font-size:14px;font-weight:600}
nav a:hover,nav a[aria-current=page]{color:var(--water-deep)}
nav .nav-cta{background:var(--water-deep);color:#fff;padding:9px 16px;border-radius:999px}
nav .nav-cta:hover{color:#fff;background:#255b72}
nav .nav-out{color:var(--wood-deep);border:1px solid var(--wood);padding:8px 14px;border-radius:999px}
.nav-toggle{display:none;border:0;background:transparent;color:var(--ink);font-weight:600}

/* sections */
.section{padding:84px 0}
.section.sand{background:var(--sand)}
.section.water{background:var(--water-pale)}
.eyebrow{font-size:11px;letter-spacing:.2em;font-weight:750;color:var(--wood-deep);margin-bottom:16px;text-transform:uppercase}
.lead{font-size:18px;line-height:1.9;max-width:640px}
.note{font-size:13px;color:var(--muted)}
.actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:8px}
.button{display:inline-block;background:var(--water-deep);color:#fff;padding:13px 24px;border-radius:999px;font-weight:650;border:0;cursor:pointer}
.button:hover{background:#255b72}
.button.secondary{background:transparent;color:var(--water-deep);border:1.5px solid var(--water-deep)}
.button.secondary:hover{background:var(--water-pale)}
.text-link{color:var(--water-deep);font-weight:650;border-bottom:1.5px solid currentColor}

/* hero */
.hero{padding:64px 0 72px;background:radial-gradient(ellipse at 85% 30%,#e3f0f4 0,transparent 60%),linear-gradient(180deg,var(--bg),#f6f0e6)}
.hero .wrap{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
.hero h1 span{color:var(--water-deep)}
.hero-art{position:relative}
.hero-art img{height:auto;border-radius:24px;box-shadow:var(--shadow);aspect-ratio:3/2;object-fit:cover;width:100%}
.caption{font-size:12px;color:var(--muted);margin-top:10px}
.page-hero{padding:64px 0 40px}
.page-hero .lead{margin-bottom:0}

/* grids & cards */
.grid{display:grid;gap:20px}
.grid.c2{grid-template-columns:repeat(2,1fr)}
.grid.c3{grid-template-columns:repeat(3,1fr)}
.grid.c4{grid-template-columns:repeat(4,1fr)}
.card{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:28px;box-shadow:var(--shadow)}
.card .tag{display:inline-block;font-size:12px;background:var(--water-pale);color:var(--water-deep);padding:3px 10px;border-radius:999px;margin-top:6px}
.card .num{font-size:13px;color:var(--wood-deep);font-weight:750;letter-spacing:.1em}
.card p:last-child{margin-bottom:0}
.scope-card{display:flex;flex-direction:column}
.scope-card p{flex:1}
.split{display:grid;grid-template-columns:1fr 1.1fr;gap:48px;align-items:start}
.fab{background:linear-gradient(135deg,#eef5f7,#f7f1e7)}
.fab .card{background:rgba(255,255,255,.85)}
.disclaimer{font-size:14px;color:var(--muted);border-left:3px solid var(--wood);padding:6px 0 6px 14px;margin-top:16px}
.steps{counter-reset:s;list-style:none;padding:0;margin:0;display:grid;gap:14px}
.steps li{counter-increment:s;background:var(--paper);border:1px solid var(--line);border-radius:14px;padding:16px 18px 16px 58px;position:relative}
.steps li::before{content:counter(s);position:absolute;left:16px;top:14px;width:28px;height:28px;border-radius:50%;background:var(--water-deep);color:#fff;font-weight:700;display:grid;place-items:center;font-size:14px}
.checklist{padding-left:20px}
.checklist li{margin-bottom:10px}
.alert{background:var(--warn-bg);border:1px solid var(--warn-line);border-radius:14px;padding:18px 20px;margin:20px 0;color:#6b4a14}
.alert strong{display:block;margin-bottom:4px}
.cta-band{background:var(--water-deep);color:#fff;border-radius:28px;padding:56px 6%;text-align:center}
.cta-band h2,.cta-band p{color:#fff}
.cta-band .eyebrow{color:#cfe4ec}
.cta-band .button{background:#fff;color:var(--water-deep)}
.industry-link{display:flex;justify-content:space-between;align-items:center;gap:20px;flex-wrap:wrap;border:1px solid var(--line);border-radius:var(--radius);padding:26px 30px;background:var(--paper)}
.industry-link p{margin:0;color:var(--ink);font-weight:600}

/* diagram */
.flowline{display:flex;align-items:stretch;gap:8px;flex-wrap:wrap;margin:16px 0 6px}
.flowline .box{flex:1;min-width:120px;background:var(--paper);border:1.5px solid var(--line);border-radius:14px;padding:14px 12px;text-align:center;font-weight:650;font-size:15px}
.flowline .box.nb{border-color:var(--water);background:var(--water-pale);color:var(--water-deep)}
.flowline .arrow{align-self:center;color:var(--wood-deep);font-weight:700}

/* products */
.spec{width:100%;border-collapse:collapse;font-size:14px;margin:10px 0}
.spec th,.spec td{border-bottom:1px solid var(--line);padding:9px 8px;text-align:left;vertical-align:top}
.spec th{color:var(--muted);font-weight:600;white-space:nowrap}
.table-scroll{overflow-x:auto}
.flow-table th,.flow-table td{text-align:center;white-space:nowrap}
.series{margin-bottom:28px}
.series h3{margin-bottom:4px}
.series .variants{font-size:14px;color:var(--wood-deep);font-weight:650}

/* faq */
details.qa{background:var(--paper);border:1px solid var(--line);border-radius:14px;padding:4px 20px;margin-bottom:12px}
details.qa summary{cursor:pointer;font-weight:650;padding:14px 0;list-style:none}
details.qa summary::after{content:"＋";float:right;color:var(--water-deep)}
details.qa[open] summary::after{content:"－"}
details.qa p{margin-bottom:16px}

/* flow tool */
.tool{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:28px;box-shadow:var(--shadow)}
.field{margin-bottom:18px}
.field label,.field legend{display:block;font-weight:650;margin-bottom:8px}
.field fieldset{border:0;padding:0;margin:0}
.seg{display:flex;flex-wrap:wrap;gap:8px}
.seg label{display:inline-flex;align-items:center;gap:6px;font-weight:500;border:1.5px solid #8c8273;border-radius:999px;padding:7px 14px;cursor:pointer;margin:0}
.seg input{accent-color:var(--water-deep)}
.seg label:has(input:checked){border-color:var(--water-deep);background:var(--water-pale);color:var(--water-deep)}
.inputs{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.tool select,.tool input[type=number],.tool input[type=text]{width:100%;padding:10px 12px;border:1.5px solid #8c8273;border-radius:10px;background:#fff}
.point-row{display:grid;grid-template-columns:1.4fr 1fr auto;gap:10px;margin-bottom:10px;align-items:center}
.point-row button{border:0;background:transparent;color:var(--muted);font-size:20px}
.calc-mini{background:var(--sand);border-radius:12px;padding:14px;margin:6px 0 14px}
.result{margin-top:24px;border-top:1px solid var(--line);padding-top:22px}
.result .big{font-size:28px;font-weight:750;color:var(--water-deep)}
.muted-row td{color:#6b7377}
.err{color:#a34a2a;font-weight:600}
.tool-notes{font-size:14px;background:var(--sand);border-radius:12px;padding:14px 18px 14px 34px;margin-top:16px}
.tool-notes li{margin-bottom:6px;color:var(--muted)}
.summary-box{white-space:pre-wrap;background:var(--sand);border-radius:12px;padding:14px;font-size:14px;margin:10px 0}
[hidden]{display:none!important}

/* contact */
.google-form-frame{width:100%;min-height:1500px;border:0;border-radius:14px;background:#fff}
.process-line{font-weight:650;color:var(--water-deep)}

/* footer */
footer{background:#2c3a40;color:#d9e1e3;margin-top:80px}
footer .wrap{padding-top:52px;padding-bottom:40px}
footer p,footer span{color:#b9c5c8}
footer .brandmark{color:#9fd0e0}
footer .brandtext{color:#fff}
.footer-top{display:flex;justify-content:space-between;align-items:center;gap:20px;flex-wrap:wrap;margin-bottom:22px}
.footer-links{display:flex;gap:20px;flex-wrap:wrap;font-size:14px}
.footer-links a{color:#fff;border-bottom:1px solid #6b8790}
.footer-note{font-size:13px;max-width:760px}
.footer-bottom{font-size:12px;display:flex;gap:18px;flex-wrap:wrap;border-top:1px solid #455960;padding-top:18px;margin-top:22px}

/* responsive */
@media (max-width:1080px){
  .nav-toggle{display:block}
  nav{display:none;position:absolute;top:78px;left:0;right:0;background:var(--bg);flex-direction:column;align-items:stretch;gap:0;padding:8px 6% 18px;border-bottom:1px solid var(--line)}
  nav.open{display:flex}
  nav a{padding:12px 0;border-bottom:1px solid var(--line)}
  nav .nav-cta,nav .nav-out{margin-top:10px;text-align:center;border-bottom:0}
}
@media (max-width:860px){
  .hero .wrap,.split{grid-template-columns:1fr}
  .grid.c3,.grid.c4{grid-template-columns:1fr 1fr}
  .section{padding:60px 0}
}
@media (max-width:560px){
  .grid.c2,.grid.c3,.grid.c4{grid-template-columns:1fr}
  .inputs{grid-template-columns:1fr}
  .point-row{grid-template-columns:1fr 1fr auto}
  .flowline{flex-direction:column}
  .flowline .arrow{transform:rotate(90deg)}
  .card,.tool{padding:22px}
  .cta-band{padding:40px 7%}
}

.skip{position:absolute;left:-9999px;top:8px;background:#fff;padding:8px 14px;border-radius:8px;z-index:20}
.skip:focus{left:12px}
.warn{color:#7a5410;font-weight:600}
fieldset{border:0;padding:0;margin:0;min-width:0}
legend{font-weight:650;margin-bottom:8px;padding:0}
.calc-mini .inputs{margin-bottom:4px}