/* Aerodyne-style design system */
:root{--primary:#376F92;--primary-dk:#2C5872;--secondary:#5D8E62;--text:#343435;
--muted:#565658;--pale:#E9F0F2;--band:#EAF3F9;--line:#DEE7EA;--bg-soft:#F7FAFB;
--font:"Open Sans","Segoe UI","PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:var(--font);color:var(--text);background:#fff;font-size:18px;line-height:1.7}
img{max-width:100%;display:block}
a{text-decoration:none;color:inherit}
.wrap{max-width:1200px;margin:0 auto;padding:0 20px}
.en{font-size:13px;letter-spacing:.22em;text-transform:uppercase;color:var(--primary);font-weight:600}

/* ---------- header ---------- */
.hdr{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:50}
.hdr-in{min-height:96px;display:flex;align-items:center;gap:24px}
.logo{display:flex;flex-direction:column;line-height:1.2;margin-right:auto}
.logo b{font-size:26px;color:var(--primary);font-weight:700}
.logo span{font-size:11px;letter-spacing:.3em;color:#79797B;text-transform:uppercase}
.nav{display:flex;gap:8px;align-items:center}
.nav a{font-size:17px;font-weight:500;color:var(--text);padding:10px 14px;position:relative}
.nav a::after{content:"";position:absolute;left:14px;right:14px;bottom:2px;height:2px;background:var(--primary);transform:scaleX(0);transition:.25s}
.nav a:hover::after,.nav a.on::after{transform:scaleX(1)}
.nav a:hover,.nav a.on{color:var(--primary)}
.search{width:40px;height:40px;border:1px solid var(--line);border-radius:30px;display:flex;align-items:center;justify-content:center;color:var(--primary);flex:none}
.search:hover{background:var(--pale)}
.burger{display:none}
@media(max-width:960px){
 .nav{display:none}.burger{display:block;margin-left:8px}
 .burger input{display:none}
 .burger svg{cursor:pointer}
 .burger ul{display:none;position:absolute;top:100%;left:0;right:0;background:#fff;border-bottom:1px solid var(--line);flex-direction:column;padding:8px 20px 16px;list-style:none}
 .burger input:checked ~ ul{display:flex}
 .burger ul a{display:block;padding:12px 4px;border-bottom:1px solid var(--pale);font-size:17px}
 .hdr-in{min-height:76px}
}

/* ---------- hero ---------- */
.hero{background:var(--band)}
.hero-split{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center;padding:72px 0 80px}
.hero h1{font-size:46px;line-height:1.2;font-weight:700;margin:14px 0 18px}
.hero p.lead{color:var(--muted);font-size:19px;max-width:32em}
.btns{display:flex;gap:14px;margin-top:30px;flex-wrap:wrap}
.btn{display:inline-block;padding:13px 34px;border-radius:30px;font-size:16px;font-weight:600;transition:.25s;border:1px solid transparent}
.btn-solid{background:var(--primary);color:#fff}
.btn-solid:hover{background:var(--primary-dk)}
.btn-ghost{border-color:var(--primary);color:var(--primary)}
.btn-ghost:hover{background:var(--pale)}
.hero-img{border-radius:12px;box-shadow:0 24px 60px rgba(38,79,105,.18)}
@media(max-width:960px){.hero-split{grid-template-columns:1fr;padding:48px 0}.hero h1{font-size:34px}}

.pagehero{padding:64px 0 56px;border-bottom:1px solid var(--line)}
.crumb{font-size:14px;color:#8a8a8c;margin-bottom:18px}
.crumb a{color:var(--primary)}
.crumb a:hover{text-decoration:underline}
.pagehero h1{font-size:44px;font-weight:700;margin:10px 0 8px}
@media(max-width:960px){.pagehero h1{font-size:32px}}

/* ---------- sections ---------- */
.sec{padding:80px 0}
.sec.band{background:var(--band)}
.sec-head{max-width:760px;margin-bottom:44px}
.sec-head h2{font-size:32px;font-weight:700;margin:10px 0 12px}
.sec-head p{color:var(--muted)}
.sec-head.center{margin-left:auto;margin-right:auto;text-align:center}
@media(max-width:960px){.sec{padding:56px 0}.sec-head h2{font-size:26px}}

.grid{display:grid;gap:26px}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
@media(max-width:1080px){.g4{grid-template-columns:repeat(2,1fr)}.g3{grid-template-columns:repeat(2,1fr)}}
@media(max-width:680px){.g4,.g3,.g2{grid-template-columns:1fr}}

.card{background:#fff;border:1px solid var(--line);border-radius:10px;overflow:hidden;position:relative;transition:.25s;display:flex;flex-direction:column}
.card::before{content:"";height:4px;background:var(--ac,var(--primary))}
.card:hover{transform:translateY(-5px);box-shadow:0 16px 40px rgba(38,79,105,.14)}
.card .im{aspect-ratio:16/10;overflow:hidden;background:var(--pale)}
.card .im img{width:100%;height:100%;object-fit:cover}
.card .bd{padding:24px 24px 26px;display:flex;flex-direction:column;gap:10px;flex:1}
.card h3{font-size:20px;font-weight:700;line-height:1.4}
.card p{font-size:15.5px;color:var(--muted);flex:1}
.more{color:var(--primary);font-weight:600;font-size:15px}
.more:hover{text-decoration:underline}
.card.plain .bd{padding:28px}
.ic{width:52px;height:52px;border-radius:10px;background:var(--pale);color:var(--primary);display:flex;align-items:center;justify-content:center;margin-bottom:4px}

/* feature tiles (no image) */
.tile{background:#fff;border:1px solid var(--line);border-top:4px solid var(--ac,var(--primary));border-radius:10px;padding:30px 26px;transition:.25s}
.tile:hover{box-shadow:0 14px 34px rgba(38,79,105,.12);transform:translateY(-4px)}
.tile h3{font-size:19px;margin-bottom:8px}
.tile p{font-size:15.5px;color:var(--muted)}

/* split text+image */
.split{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center}
.split h2{font-size:32px;font-weight:700;margin:10px 0 16px}
.split p{color:var(--muted);margin-bottom:14px}
.split .im{border-radius:12px;overflow:hidden;box-shadow:0 18px 44px rgba(38,79,105,.16)}
@media(max-width:960px){.split{grid-template-columns:1fr;gap:32px}}

/* spec table */
.spec{border:1px solid var(--line);border-radius:10px;overflow:hidden;margin-top:18px}
.spec .row{display:grid;grid-template-columns:260px 1fr;border-bottom:1px solid var(--line);font-size:16px}
.spec .row:last-child{border-bottom:0}
.spec .row:nth-child(odd){background:var(--bg-soft)}
.spec .k{padding:13px 20px;font-weight:600}
.spec .v{padding:13px 20px;color:var(--muted);border-left:1px solid var(--line)}
@media(max-width:680px){.spec .row{grid-template-columns:1fr}.spec .v{border-left:0;border-top:1px dashed var(--line)}}
.plist{margin:14px 0 0 2px;list-style:none}
.plist li{padding:7px 0 7px 26px;position:relative;color:var(--muted)}
.plist li::before{content:"";position:absolute;left:2px;top:16px;width:9px;height:9px;background:var(--primary)}
.nlist{margin:16px 0 0;list-style:none}
.nlist li{display:flex;gap:14px;padding:8px 0;align-items:flex-start}
.nlist .n{flex:none;width:28px;height:28px;border-radius:7px;background:var(--pale);color:var(--primary);font-weight:700;font-size:14px;display:flex;align-items:center;justify-content:center;margin-top:3px}

/* detail */
.detail-hero{border-radius:12px;overflow:hidden;margin:36px 0 8px;max-height:460px;box-shadow:0 18px 44px rgba(38,79,105,.14)}
.detail-hero img{width:100%;height:100%;object-fit:cover}
.detail h2{font-size:28px;font-weight:700;margin:52px 0 6px;padding-left:16px;border-left:5px solid var(--primary)}
.detail p{color:var(--muted);margin-top:14px}

/* CTA band */
.cta{background:var(--primary);color:#fff;padding:64px 0}
.cta-in{display:flex;align-items:center;justify-content:space-between;gap:26px;flex-wrap:wrap}
.cta h2{font-size:30px;font-weight:700}
.cta p{opacity:.85;margin-top:6px}
.btn-white{background:#fff;color:var(--primary)}
.btn-white:hover{background:var(--pale)}
@media(max-width:680px){.cta h2{font-size:24px}}

/* footer */
.ftr{background:var(--bg-soft);border-top:1px solid var(--line);padding:56px 0 0}
.ftr-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.3fr;gap:36px}
.ftr h4{font-size:17px;margin-bottom:14px}
.ftr ul{list-style:none}
.ftr li{margin:8px 0}
.ftr a{color:var(--muted);font-size:15px}
.ftr a:hover{color:var(--primary)}
.ftr .blurb{color:var(--muted);font-size:15px;margin-top:12px;max-width:26em}
.ftr .c-item{display:flex;gap:10px;color:var(--muted);font-size:15px;margin:9px 0;align-items:flex-start}
.ftr .c-item svg{flex:none;margin-top:4px;color:var(--primary)}
.ftr-bot{border-top:1px solid var(--line);margin-top:44px;padding:20px 0;display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap;color:#8a8a8c;font-size:14px}
@media(max-width:960px){.ftr-grid{grid-template-columns:1fr 1fr}}
@media(max-width:620px){.ftr-grid{grid-template-columns:1fr}}

/* products tabs */
.tabs{display:inline-flex;background:var(--bg-soft);border:1px solid var(--line);border-radius:30px;padding:5px;gap:4px;margin-bottom:38px;flex-wrap:wrap}
.tabs a{padding:9px 24px;border-radius:30px;font-size:15.5px;font-weight:600;color:var(--muted)}
.tabs a.on{background:var(--primary);color:#fff}
.tabs a:hover:not(.on){background:var(--pale);color:var(--primary)}

/* contact */
.ccard{background:#fff;border:1px solid var(--line);border-top:4px solid var(--ac,var(--primary));border-radius:10px;padding:28px 24px}
.ccard .ic{margin-bottom:12px}
.ccard h3{font-size:19px;margin-bottom:10px}
.ccard p{color:var(--muted);font-size:15.5px}
.form{background:#fff;border:1px solid var(--line);border-radius:12px;padding:36px;max-width:760px;margin:0 auto}
.frm-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.form input,.form textarea{width:100%;border:1px solid var(--line);border-radius:8px;padding:12px 14px;font:inherit;font-size:15.5px;color:var(--text);background:var(--bg-soft)}
.form input:focus,.form textarea:focus{outline:2px solid var(--primary);background:#fff}
.form textarea{min-height:130px;resize:vertical}
.form .full{grid-column:1/-1}
.form .note{font-size:13.5px;color:#8a8a8c;margin-top:14px}
@media(max-width:620px){.frm-grid{grid-template-columns:1fr}.form{padding:24px}}