:root{
  --ink:#1d272c;
  --ink-soft:#52646c;
  --line:#e7ebee;
  --bg:#ffffff;
  --bg-alt:#eaf0f2;
  --accent:#2f6f8f;
  --accent-dark:#22566f;
  --accent-bright:#69b4d8;
  --header:#16262d;
  --max:1180px;
  --radius:14px;
  --shadow:0 18px 40px -22px rgba(20,45,60,.35);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;color:var(--ink);background:var(--bg);
  font-family:"Noto Sans HK",-apple-system,BlinkMacSystemFont,"PingFang HK","Microsoft JhengHei",sans-serif;
  font-weight:400;line-height:1.75;-webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4{font-family:"Noto Serif HK","Noto Sans HK",serif;font-weight:700;line-height:1.25;margin:0}
.wrap{max-width:var(--max);margin:0 auto;padding:0 24px}
.wrap.narrow{max-width:820px}
.center{text-align:center;margin-top:38px}

/* ---------- header (dark) ---------- */
.site-header{position:sticky;top:0;z-index:50;background:var(--header);border-bottom:1px solid rgba(255,255,255,.07);box-shadow:0 6px 24px -10px rgba(0,0,0,.45)}
.bar{max-width:var(--max);margin:0 auto;padding:10px 24px;display:flex;align-items:center;justify-content:space-between;gap:20px}
.brand img{height:54px;width:auto;filter:brightness(0) invert(1)}
.nav{display:flex;align-items:center;gap:26px}
.nav>a,.drop-trigger{font-size:15px;font-weight:500;color:#cdd8dd;padding:6px 0;position:relative;transition:color .2s}
.nav>a:hover,.drop-trigger:hover{color:#fff}
.nav>a.active,.drop-trigger.active{color:#fff}
.nav>a.active::after,.drop-trigger.active::after{content:"";position:absolute;left:0;right:0;bottom:-2px;height:2px;background:var(--accent-bright)}
.dropdown{position:relative}
.caret{font-size:10px;color:var(--accent-bright)}
.dropdown-menu{position:absolute;top:100%;left:50%;transform:translateX(-50%) translateY(8px);background:#fff;border:1px solid var(--line);border-radius:10px;box-shadow:var(--shadow);padding:8px;min-width:130px;opacity:0;visibility:hidden;transition:.2s}
.dropdown:hover .dropdown-menu{opacity:1;visibility:visible;transform:translateX(-50%) translateY(4px)}
.dropdown-menu a{display:block;padding:8px 14px;border-radius:7px;font-size:14px;color:var(--ink)}
.dropdown-menu a:hover{background:var(--bg-alt);color:var(--accent)}
.nav-social{display:flex;gap:12px;padding-left:16px;border-left:1px solid rgba(255,255,255,.15)}
.nav-social a{color:#9fb2ba;transition:color .2s}
.nav-social a:hover{color:#fff}
.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:8px}
.nav-toggle span{width:24px;height:2px;background:#fff;transition:.3s}

/* ---------- buttons / bits ---------- */
.btn{display:inline-block;background:var(--accent);color:#fff;padding:13px 30px;border-radius:40px;font-weight:500;font-size:15px;border:0;cursor:pointer;transition:.25s;letter-spacing:.03em}
.btn:hover{background:var(--accent-dark);transform:translateY(-2px)}
.btn.light{background:#fff;color:var(--accent)}
.btn.light:hover{background:#eef4f7}
.kicker{letter-spacing:.28em;font-size:12px;color:var(--accent);font-weight:700;margin:0 0 10px}
.eyebrow{letter-spacing:.32em;font-size:12px;font-weight:700;color:var(--accent);margin:0 0 14px}
.section{padding:90px 0}
.section.alt{background:var(--bg-alt)}
.section-title{font-size:clamp(26px,3.4vw,40px);margin-bottom:36px}
.link-arrow{display:inline-block;margin-top:26px;color:var(--accent);font-weight:500;transition:.2s}
.link-arrow:hover{transform:translateX(4px)}

/* ---------- hero ---------- */
.hero{position:relative}
.slider{position:relative;overflow:hidden;height:min(82vh,680px);background:#0d1518}
.slides{display:flex;height:100%;transition:transform .8s cubic-bezier(.4,0,.2,1)}
.slide{min-width:100%;height:100%}
.slide img{width:100%;height:100%;object-fit:cover}
.slider::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(13,21,24,.55),rgba(13,21,24,.05) 55%,rgba(13,21,24,.25))}
.arrow{position:absolute;top:50%;transform:translateY(-50%);background:rgba(255,255,255,.85);border:0;width:46px;height:46px;border-radius:50%;font-size:24px;cursor:pointer;color:var(--ink);z-index:3;transition:.2s}
.arrow:hover{background:#fff}
.arrow.prev{left:18px}.arrow.next{right:18px}
.dots{position:absolute;bottom:20px;left:0;right:0;display:flex;justify-content:center;gap:9px;z-index:3}
.dot{width:9px;height:9px;border-radius:50%;border:0;background:rgba(255,255,255,.5);cursor:pointer;transition:.2s}
.dot.active{background:#fff;width:26px;border-radius:5px}
.hero-caption{position:absolute;top:50%;z-index:3;color:#fff;max-width:var(--max);padding:0 24px;left:50%;transform:translate(-50%,-50%);width:100%}
.hero-caption h1{font-size:clamp(38px,6vw,72px);color:#fff;margin-bottom:18px;text-shadow:0 6px 30px rgba(0,0,0,.3)}
.hero-caption .lead{font-size:clamp(16px,1.8vw,20px);margin-bottom:30px;max-width:440px;color:#eef3f5}

/* ---------- tips ---------- */
.tips-grid{display:grid;grid-template-columns:1fr 1fr;gap:46px}
.tips-grid h3{font-size:21px;margin-bottom:14px;color:var(--accent-dark)}
.tips-grid p{color:var(--ink-soft);margin:0 0 14px}

/* ---------- features ---------- */
.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:30px}
.feature{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:34px;text-align:center;transition:.3s}
.feature:hover{transform:translateY(-6px);box-shadow:var(--shadow)}
.feature img{width:120px;height:84px;object-fit:cover;border-radius:10px;margin:0 auto 20px}
.feature h3{font-size:20px;margin-bottom:12px}
.feature ul{list-style:none;padding:0;margin:0;color:var(--ink-soft)}
.feature ul li{padding:3px 0}
.feature p{color:var(--ink-soft);margin:0}

/* ---------- experience ---------- */
.exp-wrap{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center}
.exp-list{margin:24px 0}
.exp-list>div{display:flex;align-items:center;gap:18px;padding:16px 0;border-bottom:1px solid var(--line)}
.exp-list span{font-family:"Noto Serif HK",serif;font-size:22px;color:var(--accent);font-weight:700}
.exp-list h3{font-size:20px}
.exp-img img{width:100%;border-radius:var(--radius);box-shadow:var(--shadow)}

/* ---------- cta ---------- */
.cta{background:linear-gradient(135deg,var(--accent),var(--accent-dark));color:#fff;padding:80px 0;text-align:center}
.cta h2{color:#fff;font-size:clamp(24px,3vw,36px);margin-bottom:14px}
.cta p{color:#e6f0f4;margin:0 0 30px}

/* ---------- page head ---------- */
.page-head{background:linear-gradient(180deg,#e7eef1 0%,#d8e2e6 100%);padding:66px 0 58px;border-bottom:1px solid var(--line);text-align:center}
.page-head h1{font-size:clamp(30px,5vw,48px)}
.page-sub{color:var(--ink-soft);margin-top:14px}

/* ---------- about ---------- */
.about-wrap{display:grid;grid-template-columns:1.2fr 1fr;gap:56px;align-items:center}
.about-text p{color:var(--ink-soft);margin:0 0 18px;font-size:17px}
.about-img img{width:100%;border-radius:var(--radius);box-shadow:var(--shadow)}

/* ---------- gallery ---------- */
.gallery-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.gcard{margin:0;border-radius:var(--radius);overflow:hidden;position:relative;background:#000}
.gcard img{width:100%;height:300px;object-fit:cover;transition:.5s}
.gcard:hover img{transform:scale(1.06);opacity:.85}
.gcard figcaption{position:absolute;left:0;bottom:0;right:0;padding:14px 18px;color:#fff;font-weight:500;background:linear-gradient(transparent,rgba(0,0,0,.6))}

/* ---------- products ---------- */
.product-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.pcard{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:#fff;transition:.3s}
.pcard:hover{transform:translateY(-6px);box-shadow:var(--shadow)}
.pcard-img{aspect-ratio:1/1;overflow:hidden;background:var(--bg-alt)}
.pcard-img img{width:100%;height:100%;object-fit:cover;transition:.5s}
.pcard:hover .pcard-img img{transform:scale(1.05)}
.pcard-body{padding:20px}
.pcard-body h3{font-size:19px;margin-bottom:6px}
.pcard-body p{color:var(--ink-soft);font-size:13.5px;margin:0;line-height:1.5}

/* ---------- pd ---------- */
.pd-wrap{display:grid;grid-template-columns:1fr 1fr;gap:54px;align-items:start}
.pd-list{list-style:none;padding:0;margin:0 0 26px}
.pd-list li{padding:12px 0;border-bottom:1px solid var(--line);color:var(--ink-soft)}
.pd-list strong{color:var(--ink)}
.pd-spec{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-bottom:30px}
.pd-spec p{margin:0;background:var(--bg-alt);border-radius:10px;padding:14px 16px;font-size:15px}
.pd-spec span{display:block;font-size:12px;color:var(--accent);letter-spacing:.1em;margin-bottom:4px}
.pd-cover img{width:100%;border-radius:var(--radius);box-shadow:var(--shadow)}
.pd-opts-head{text-align:center;margin-bottom:8px}
.pd-opts-head .page-sub{max-width:560px;margin:14px auto 0}
.pd-charts{display:grid;grid-template-columns:1fr 1fr;gap:34px;margin-top:40px;max-width:900px;margin-left:auto;margin-right:auto}
.pd-charts figure{margin:0;text-align:center}
.pd-charts img{width:100%;border-radius:var(--radius);box-shadow:var(--shadow);background:#fff;transition:.3s}
.pd-charts a:hover img{transform:translateY(-4px);box-shadow:0 26px 50px -20px rgba(20,45,60,.5)}
.pd-charts figcaption{margin-top:14px;color:var(--ink-soft);font-size:15px;font-weight:500}

/* ---------- faq ---------- */
.faq-item{border-bottom:1px solid var(--line)}
.faq-q{width:100%;background:none;border:0;text-align:left;padding:24px 0;font-size:18px;font-weight:500;color:var(--ink);cursor:pointer;display:flex;justify-content:space-between;align-items:center;gap:20px;font-family:inherit}
.faq-q:hover{color:var(--accent)}
.plus{font-size:24px;color:var(--accent);transition:.3s;flex-shrink:0}
.faq-item.open .plus{transform:rotate(45deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .35s ease}
.faq-a p{color:var(--ink-soft);margin:0;padding:0 0 24px}

/* ---------- services ---------- */
.svc-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:30px}
.svc{text-align:center}
.svc-img{border-radius:var(--radius);overflow:hidden;margin-bottom:22px;box-shadow:var(--shadow)}
.svc-img img{width:100%;height:230px;object-fit:cover;transition:.5s}
.svc:hover .svc-img img{transform:scale(1.05)}
.svc h3{font-size:24px;margin-bottom:6px}
.svc-tag{color:var(--accent);font-weight:500;margin:0 0 12px;letter-spacing:.04em}
.svc p{color:var(--ink-soft);margin:0}

/* ---------- contact ---------- */
.contact-wrap{display:grid;grid-template-columns:.9fr 1.1fr;gap:54px}
.contact-info h3{font-size:24px;margin-bottom:24px}
.ci{margin:0 0 16px;color:var(--ink-soft);display:flex;gap:14px}
.ci strong{color:var(--ink);min-width:48px}
.contact-social{display:flex;gap:14px;margin-top:24px}
.contact-social a{color:var(--accent)}
.contact-form{background:var(--bg-alt);padding:34px;border-radius:var(--radius)}
.field{margin-bottom:18px}
.field label{display:block;font-size:14px;margin-bottom:7px;color:var(--ink)}
.field input,.field textarea{width:100%;padding:12px 14px;border:1px solid var(--line);border-radius:9px;font-family:inherit;font-size:15px;background:#fff;color:var(--ink)}
.field input:focus,.field textarea:focus{outline:none;border-color:var(--accent)}
.form-note{margin:16px 0 0;font-size:14px;min-height:20px}
.form-note.ok{color:#1f8a4c}
.form-note.err{color:#c0392b}

/* ---------- footer ---------- */
.site-footer{background:#16242a;color:#c4d2d8;padding:56px 0 0}
.foot-inner{max-width:var(--max);margin:0 auto;padding:0 24px;display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:40px}
.foot-brand img{height:60px;margin-bottom:16px;filter:brightness(0) invert(1)}
.foot-brand p{color:#8ea3ac;margin:0;font-size:14px}
.foot-col h4{color:#fff;font-size:16px;margin-bottom:16px}
.foot-col p{margin:0 0 10px;font-size:14px}
.foot-col a:hover{color:#fff}
.foot-social{display:flex;gap:14px}
.foot-social a{color:#8ea3ac}
.foot-social a:hover{color:#fff}
.foot-base{text-align:center;padding:28px 0;margin-top:46px;border-top:1px solid rgba(255,255,255,.1);font-size:13px;color:#7c9099}

/* ---------- responsive ---------- */
@media(max-width:900px){
  .nav-toggle{display:flex}
  .nav{position:fixed;top:75px;right:0;left:0;background:var(--header);flex-direction:column;align-items:flex-start;gap:0;padding:10px 24px 24px;border-bottom:1px solid rgba(255,255,255,.1);box-shadow:var(--shadow);transform:translateY(-150%);transition:transform .35s;height:auto}
  .nav.open{transform:translateY(0)}
  .nav>a,.drop-trigger{width:100%;padding:14px 0;border-bottom:1px solid rgba(255,255,255,.08)}
  .dropdown{width:100%}
  .dropdown-menu{position:static;transform:none;opacity:1;visibility:visible;box-shadow:none;border:0;padding:0 0 10px 16px;min-width:0;background:transparent}
  .dropdown-menu a{color:#cdd8dd}
  .dropdown:hover .dropdown-menu{transform:none}
  .nav-social{border:0;padding:14px 0 0}
  .tips-grid,.exp-wrap,.about-wrap,.pd-wrap,.pd-charts,.contact-wrap{grid-template-columns:1fr;gap:34px}
  .feature-grid,.product-grid,.gallery-grid,.svc-grid{grid-template-columns:1fr 1fr}
  .section{padding:60px 0}
  .hero-caption{text-align:center}
  .hero-caption .lead{margin-left:auto;margin-right:auto}
  .foot-inner{grid-template-columns:1fr;gap:30px}
}
@media(max-width:560px){
  .feature-grid,.product-grid,.gallery-grid,.svc-grid,.pd-spec{grid-template-columns:1fr}
  .slider{height:62vh}
  .brand img{height:46px}
}

.pcard-more{margin-top:8px}
.pcard-more a{color:#0e7490;font-weight:600;text-decoration:none;font-size:14px}
.pcard-more a:hover{text-decoration:underline}
.btn-ghost{background:transparent;color:#16242a;border:1px solid #16242a}
.btn-ghost:hover{background:#16242a;color:#fff}

.model-grid{display:grid;grid-template-columns:1fr;gap:28px;margin-top:24px}
.model-card{background:#fff;border:1px solid #e5e7eb;border-radius:12px;overflow:hidden}
.model-card figure{margin:0}
.model-card figure img{width:100%;height:auto;display:block}
.model-card figcaption{font-weight:700;font-size:18px;padding:14px 20px 4px;color:#16242a}
.model-spec{padding:4px 20px 18px}
.spec-row{display:flex;gap:14px;padding:9px 0;border-bottom:1px solid #eef1f3;font-size:14px;line-height:1.55}
.spec-row:last-child{border-bottom:none}
.spec-row span{flex:0 0 5.5em;color:#0e7490;font-weight:600}
.spec-row div{flex:1;color:#374151}
@media(min-width:1000px){
  .model-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:36px}
  .model-card figcaption{font-size:20px;padding:18px 24px 6px}
  .model-spec{padding:6px 24px 22px}
  .spec-row{font-size:15px}
}