:root{
  --navy:#0A2540;          /* SafePTT primary: deep navy */
  --navy-dark:#061A30;     /* utility bar / footer base */
  --navy2:#103A5F;         /* hero gradient end */
  --accent:#066BDD;        /* SafePTT accent: logo icon blue (taken from logo artwork) */
  --accent-dark:#0558B4;
  --brand-red:#F50E18;     /* SafePTT brand red (taken from logo PTT letters) — small accents only */
  --brand-red-dark:#D00C14;
  --accent-light:#8ED0F5;
  --ink:#1A2430; --muted:#5B6B7C; --line:#DDE4EC; --bg:#F5F7FA; --card:#fff;
  --radius:10px;
}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:"Segoe UI",Arial,Helvetica,sans-serif;color:var(--ink);background:var(--bg);line-height:1.55}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:1160px;margin:0 auto;padding:0 20px}

/* ---------- header (sticky, two rows) ---------- */
header.site{background:var(--navy);color:#fff;position:sticky;top:0;z-index:30;box-shadow:0 2px 10px rgba(6,26,48,.25)}

/* utility bar */
.topbar{background:var(--navy-dark);font-size:13.5px;position:relative}
.topbar-in{display:flex;align-items:center;gap:18px;padding-top:7px;padding-bottom:7px;flex-wrap:wrap}
.topbar-left{display:flex;gap:18px;flex-wrap:wrap}
.topbar a{color:#CFE3F2}
.topbar a:hover{color:#fff}
.topbar-right{margin-left:auto;display:flex;gap:8px;align-items:center}
.icon-btn{display:inline-flex;align-items:center;justify-content:center;width:30px;height:30px;border-radius:50%;background:rgba(255,255,255,.12);border:0;cursor:pointer;color:#fff;padding:0}
.icon-btn:hover{background:var(--accent);text-decoration:none}
.icon-btn svg{width:17px;height:17px;fill:#fff;display:block}
.wechat-pop{position:absolute;right:20px;top:calc(100% + 8px);width:280px;background:#fff;color:var(--ink);border:1px solid var(--line);border-radius:var(--radius);box-shadow:0 12px 30px rgba(6,26,48,.25);padding:16px;z-index:40}
.wechat-pop strong{color:var(--navy)}
.wechat-pop p{color:var(--muted);font-size:13.5px;margin:6px 0 10px}
.wechat-pop button{background:var(--accent);color:#fff;border:0;border-radius:6px;padding:6px 14px;cursor:pointer;font-weight:600}

/* main nav row */
.navbar{display:flex;align-items:center;gap:22px;padding-top:12px;padding-bottom:12px;flex-wrap:wrap}
.logo{display:inline-flex;align-items:center}
.logo img{height:40px;width:auto;display:block;background:#fff;border-radius:8px;padding:4px 10px}
.logo:hover{text-decoration:none}
.navbar .btn{background:var(--brand-red)}
.navbar .btn:hover{background:var(--brand-red-dark)}
nav.main{display:flex;gap:4px;flex-wrap:wrap;align-items:center}
nav.main> a,nav.main .has-drop> a{color:#DBE6F2;font-size:14.5px;font-weight:600;letter-spacing:.4px;padding:8px 10px;border-radius:6px;display:inline-block}
nav.main> a:hover,nav.main .has-drop> a:hover{color:#fff;background:rgba(255,255,255,.08);text-decoration:none}
.has-drop{position:relative}
.has-drop .drop{display:none;position:absolute;left:0;top:100%;background:#fff;border:1px solid var(--line);border-radius:8px;box-shadow:0 14px 30px rgba(6,26,48,.22);min-width:210px;padding:8px;z-index:35}
.has-drop:hover .drop,.has-drop:focus-within .drop{display:block}
.has-drop .drop a{display:block;color:var(--navy);font-size:14.5px;font-weight:600;padding:8px 10px;border-radius:6px}
.has-drop .drop a:hover{background:#EAF3FB;text-decoration:none}
.nav-tools{display:flex;gap:10px;align-items:center;margin-left:auto;flex-wrap:wrap}
.nav-search{display:flex}
.nav-search input{width:230px;padding:9px 12px;border:1px solid #33506E;border-right:0;border-radius:6px 0 0 6px;font-size:14px;background:#fff;color:var(--ink)}
.nav-search button{background:var(--accent);color:#fff;border:0;padding:9px 16px;border-radius:0 6px 6px 0;font-weight:700;cursor:pointer;font-size:14px}
.nav-search button:hover{background:var(--accent-dark)}
.lang-select{padding:9px 8px;border:1px solid #33506E;border-radius:6px;background:var(--navy2);color:#DBE6F2;font-size:14px;cursor:pointer}
.btn{display:inline-block;background:var(--accent);color:#fff;font-weight:700;padding:10px 20px;border-radius:6px;border:0;cursor:pointer;font-size:15px}
.btn:hover{text-decoration:none;background:var(--accent-dark)}
.btn.ghost{background:transparent;color:#fff;border:1px solid #7D97B3}
.btn.ghost:hover{background:rgba(255,255,255,.1)}
.btn.blue{background:var(--accent);color:#fff}
.btn.blue:hover{background:var(--accent-dark)}

/* hero */
.hero{background:linear-gradient(120deg,var(--navy) 0%,var(--navy2) 60%,var(--accent-dark) 100%);color:#fff;padding:64px 0 56px}
.hero h1{font-size:40px;line-height:1.2;max-width:760px}
.hero h1 em{font-style:normal;color:var(--accent-light)}
.hero p{margin:18px 0 26px;color:#CFDEEE;max-width:640px;font-size:17px}
.hero .cta-row{display:flex;gap:14px;flex-wrap:wrap}

section{padding:48px 0}
section h2{font-size:28px;margin-bottom:8px;color:var(--navy)}
section .sub{color:var(--muted);margin-bottom:28px;max-width:720px}

/* category cards */
.cat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.cat-grid.four{grid-template-columns:repeat(4,1fr)}
.cat-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:26px}
.cat-card h3{font-size:20px;margin-bottom:8px;color:var(--navy)}
.cat-card p{color:var(--muted);font-size:15px;margin-bottom:14px}

/* product cards */
.prod-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.prod-card{background:var(--card);border:2px solid var(--line);border-radius:var(--radius);overflow:hidden;display:flex;flex-direction:column;transition:border-color .18s ease,box-shadow .18s ease,transform .18s ease}
.prod-card:hover{border-color:var(--accent);box-shadow:0 12px 26px rgba(10,37,64,.18);transform:translateY(-3px) scale(1.01)}
.prod-img{height:180px;background:repeating-linear-gradient(45deg,#E7EDF4,#E7EDF4 14px,#DFE7F0 14px,#DFE7F0 28px);display:flex;align-items:center;justify-content:center;color:#7D97B3;font-weight:700;letter-spacing:1px;text-align:center;padding:12px}
.prod-img img{width:100%;height:100%;object-fit:cover;display:block}
.prod-img:has(img){padding:0;background:#fff}
.gallery{display:flex;gap:10px;flex-wrap:wrap;margin-top:12px}
.gallery img{width:96px;height:72px;object-fit:cover;border:1px solid var(--line);border-radius:6px}
.prod-body{padding:18px;display:flex;flex-direction:column;gap:8px;flex:1}
.prod-body h3{font-size:17px;color:var(--navy)}
.prod-body .model{color:var(--muted);font-size:13px;text-transform:uppercase;letter-spacing:.5px}
.prod-body p{color:var(--muted);font-size:14px;flex:1}
.tag{display:inline-block;font-size:12px;font-weight:700;padding:2px 9px;border-radius:999px;background:#E8F3FB;color:var(--accent-dark)}
.tag.cat{background:#EDF3F9;color:var(--navy)}
.tags{display:flex;gap:6px;flex-wrap:wrap}

/* strengths */
.strength-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.strength{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px}
.strength h3{font-size:16px;color:var(--navy);margin-bottom:6px}
.strength p{color:var(--muted);font-size:14px}

/* CTA band */
.cta-band{background:var(--navy);color:#fff;border-radius:var(--radius);padding:36px;text-align:center}
.cta-band h2{color:#fff}
.cta-band p{color:#CFDEEE;margin:10px auto 22px;max-width:560px}

/* filters */
.filters{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:26px}
.filters button{border:1px solid var(--line);background:#fff;padding:8px 18px;border-radius:999px;cursor:pointer;font-size:14px;font-weight:600;color:var(--navy)}
.filters button.active{background:var(--accent);color:#fff;border-color:var(--accent)}
.search-note{background:#EAF3FB;border:1px solid #BCD9F0;color:var(--navy);border-radius:6px;padding:10px 14px;font-size:14.5px;margin-bottom:22px}
.search-note a{font-weight:700}

/* detail */
.detail-head{display:grid;grid-template-columns:1fr 1.2fr;gap:28px;align-items:start}
.detail-img{height:320px;border-radius:var(--radius)}
table.spec{width:100%;border-collapse:collapse;background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;margin-top:18px}
table.spec th,table.spec td{padding:11px 16px;text-align:left;font-size:15px;border-bottom:1px solid var(--line)}
table.spec th{width:220px;background:#EDF4FA;color:var(--navy);font-weight:700}
table.spec tr:last-child th,table.spec tr:last-child td{border-bottom:0}
.feature-list{margin:10px 0 0 18px;color:var(--muted)}
.feature-list li{margin-bottom:4px}

/* forms */
form.inquiry{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px;max-width:680px}
form.inquiry label{display:block;font-weight:600;margin:16px 0 6px;font-size:14px}
form.inquiry label:first-child{margin-top:0}
form.inquiry input,form.inquiry select,form.inquiry textarea{width:100%;padding:10px 12px;border:1px solid var(--line);border-radius:6px;font-size:15px;font-family:inherit}
.form-note{color:var(--muted);font-size:13px;margin-top:14px}
.form-ok{background:#E7F6EC;border:1px solid #9FD3AE;color:#14532D;padding:12px 16px;border-radius:6px;margin-top:16px;display:none}

/* company info block (About / Contact) */
.company-info{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px 28px;margin-bottom:28px;max-width:680px}
.company-info h3{color:var(--navy);margin-bottom:10px;font-size:18px}
.company-info p{color:var(--muted);font-size:15px;margin-bottom:6px}
.company-info p strong{color:var(--ink)}

/* footer */
footer.site{background:var(--navy);color:#AEBFD2;padding:38px 0 0;margin-top:20px;font-size:14px}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:28px;padding-bottom:28px}
.foot-brand{font-size:20px;font-weight:800;letter-spacing:1px;color:#fff;margin-bottom:10px}
.foot-brand span{color:var(--accent-light)}
footer.site h4{color:#fff;font-size:15px;margin-bottom:10px}
footer.site p{margin-bottom:6px;line-height:1.6}
footer.site a{color:#DBE6F2}
.foot-base{border-top:1px solid rgba(255,255,255,.14);padding-top:16px;padding-bottom:18px;color:#8FA5BC;font-size:13px}

@media(max-width:900px){
  .cat-grid,.cat-grid.four,.prod-grid,.strength-grid{grid-template-columns:repeat(2,1fr)}
  .detail-head{grid-template-columns:1fr}
  .foot-grid{grid-template-columns:1fr 1fr}
  .hero h1{font-size:32px}
  .nav-tools{margin-left:0}
}
@media(max-width:560px){
  .cat-grid,.cat-grid.four,.prod-grid,.strength-grid,.foot-grid{grid-template-columns:1fr}
  .nav-search input{width:160px}
}