:root{
  --navy:#14325c; --navy-deep:#0d2445; --navy-2:#1a3e6e; --blue:#1e88e5; --blue-light:#6cb8ff;
  --silver:#dfe5ec; --text:#eef3f9; --muted:#a9b9cf; --line:rgba(255,255,255,.12);
  --maxw:1120px;
  --font:"Noto Sans HK","Noto Sans TC","Noto Sans CJK HK","PingFang HK","Microsoft JhengHei",system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:var(--font);background:var(--navy);color:var(--text);line-height:1.75;font-size:16px;-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
a{color:var(--blue-light);text-decoration:none}
a:hover{color:#fff}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}

/* header */
.site-header{position:sticky;top:0;z-index:20;background:rgba(13,36,69,.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;height:68px}
.brand{display:flex;align-items:center;gap:10px}
.brand img.tooth{width:40px;height:40px;border-radius:8px}
.brand img.word{height:24px;width:auto}
.nav{display:flex;gap:28px;align-items:center}
.nav a{color:var(--silver);font-size:15px;letter-spacing:.12em}
.nav a.active,.nav a:hover{color:#fff;box-shadow:inset 0 -2px 0 var(--blue)}
.nav-toggle,.nav-btn{display:none}

/* typography */
.eyebrow{font-size:13px;letter-spacing:.42em;text-transform:uppercase;color:var(--blue-light);margin:0 0 14px}
h1,h2,h3{font-weight:700;line-height:1.35;margin:0 0 .6em}
h2.caps,.caps{text-transform:uppercase;letter-spacing:.32em}
h2{font-size:clamp(22px,3vw,30px);letter-spacing:.12em}
h3{font-size:19px;letter-spacing:.08em}
p{margin:0 0 1em}
.lead{font-size:18px;color:var(--silver)}
.muted{color:var(--muted)}
.silver{background:linear-gradient(180deg,#ffffff 0%,#c9d2dc 55%,#8e9aa8 100%);-webkit-background-clip:text;background-clip:text;color:transparent}
.blue{color:var(--blue)}

/* hero */
.hero{position:relative;overflow:hidden;background:radial-gradient(ellipse at 50% 30%,#13335a 0%,#13335a 35%,var(--navy-deep) 100%);text-align:center;padding:72px 0 150px}
.hero .logo{width:min(420px,78vw);margin:0 auto 34px;filter:drop-shadow(0 18px 40px rgba(0,0,0,.35))}
.hero .product{font-size:clamp(15px,2.2vw,22px);letter-spacing:.38em;text-transform:uppercase;font-weight:700;margin:0 0 18px;padding-left:.38em}
.hero .tagline{font-size:clamp(13px,1.6vw,17px);letter-spacing:.42em;text-transform:uppercase;font-weight:700;color:#fff;margin:0 0 30px;padding-left:.42em}
.hero .intro{max-width:620px;margin:0 auto 34px;color:var(--silver)}
.page-hero{position:relative;overflow:hidden;background:radial-gradient(ellipse at 50% 0%,#1b4378 0%,var(--navy) 60%,var(--navy-deep) 100%);padding:64px 0 110px;text-align:center}
.page-hero h1{font-size:clamp(26px,4vw,40px);letter-spacing:.18em}
.page-hero .eyebrow{margin-bottom:10px}
.waves{position:absolute;left:0;right:0;bottom:0;width:100%;height:140px;pointer-events:none}
.sparkle{position:absolute;width:4px;height:4px;border-radius:50%;background:#fff;box-shadow:0 0 10px 3px rgba(150,205,255,.7);opacity:.85}

/* buttons */
.btns{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
.btn{display:inline-block;padding:13px 28px;border-radius:999px;font-weight:700;letter-spacing:.16em;font-size:15px;border:1px solid transparent;transition:.2s}
.btn-primary{background:var(--blue);color:#fff;box-shadow:0 8px 24px rgba(30,136,229,.35)}
.btn-primary:hover{background:#3d9bf0;color:#fff}
.btn-ghost{border-color:rgba(255,255,255,.45);color:#fff}
.btn-ghost:hover{border-color:#fff;background:rgba(255,255,255,.08)}
.btn[aria-disabled="true"]{opacity:.55;cursor:not-allowed;box-shadow:none}

/* sections */
section.block{padding:84px 0}
section.alt{background:var(--navy-deep)}
section.light{background:#f3f6fa;color:#173257}
section.light .muted{color:#5a6c84}
section.light h2{color:#14325c}
.center{text-align:center}
.section-head{max-width:700px;margin:0 auto 46px;text-align:center}
.grid{display:grid;gap:22px}
.g3{grid-template-columns:repeat(3,1fr)}
.g2{grid-template-columns:repeat(2,1fr)}
.card{background:linear-gradient(180deg,rgba(255,255,255,.06),rgba(255,255,255,.02));border:1px solid var(--line);border-radius:18px;padding:30px 26px}
section.light .card{background:#fff;border-color:#dbe3ee;box-shadow:0 10px 30px rgba(20,50,92,.06)}
.card .num{font-size:13px;letter-spacing:.3em;color:var(--blue);font-weight:700;margin-bottom:10px}
.keywords{display:flex;justify-content:center;gap:clamp(18px,6vw,80px);flex-wrap:wrap}
.keywords span{font-size:clamp(20px,3.4vw,34px);font-weight:800;letter-spacing:.4em;text-transform:uppercase;padding-left:.4em}
.keywords i{font-style:normal;color:var(--blue);font-size:clamp(20px,3.4vw,34px)}
.split{display:grid;grid-template-columns:1.05fr 1fr;gap:48px;align-items:center}
.cover-img{border-radius:20px;border:1px solid var(--line);box-shadow:0 24px 60px rgba(0,0,0,.35)}

/* TBC marker */
.tbc{display:inline-block;font-size:12px;letter-spacing:.12em;font-weight:700;color:#ffd27a;border:1px solid rgba(255,210,122,.55);border-radius:999px;padding:2px 10px;margin-left:8px;vertical-align:middle;white-space:nowrap}
section.light .tbc{color:#a26200;border-color:#e3b25c}
.tbc-line{color:var(--muted);font-size:15px}

/* steps */
.steps{counter-reset:s;display:grid;gap:18px;max-width:760px;margin:0 auto}
.step{display:flex;gap:18px;align-items:flex-start}
.step .n{flex:0 0 46px;height:46px;border-radius:50%;border:1px solid var(--blue);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;letter-spacing:.05em}

/* faq */
.faq{max-width:820px;margin:0 auto}
.faq details{border-bottom:1px solid var(--line);padding:6px 0}
.faq summary{cursor:pointer;list-style:none;padding:18px 40px 18px 0;font-size:18px;font-weight:700;letter-spacing:.06em;position:relative}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";position:absolute;right:6px;top:14px;font-size:24px;color:var(--blue);font-weight:400}
.faq details[open] summary::after{content:"–"}
.faq .ans{padding:0 0 20px;color:var(--silver)}

/* contact */
.contact-list{list-style:none;padding:0;margin:0}
.contact-list li{display:flex;justify-content:space-between;gap:16px;padding:16px 0;border-bottom:1px solid var(--line);flex-wrap:wrap}
.contact-list li b{letter-spacing:.12em}

/* footer */
.site-footer{position:relative;background:var(--navy-deep);border-top:1px solid var(--line);padding:56px 0 34px;overflow:hidden}
.site-footer .wrap{position:relative;z-index:1}
.foot-grid{display:flex;justify-content:space-between;gap:30px;flex-wrap:wrap;align-items:flex-start}
.foot-brand img{height:26px;width:auto;margin-bottom:12px}
.foot-tag{letter-spacing:.38em;font-size:12px;color:var(--muted);text-transform:uppercase}
.foot-nav{display:flex;gap:22px;flex-wrap:wrap}
.foot-nav a{color:var(--silver);font-size:14px;letter-spacing:.1em}
.copy{margin-top:34px;font-size:13px;color:var(--muted);letter-spacing:.06em}

@media (max-width:860px){
  .g3,.g2,.split{grid-template-columns:1fr}
  .split{gap:30px}
  section.block{padding:60px 0}
  .nav-btn{display:flex;flex-direction:column;gap:5px;cursor:pointer;padding:10px}
  .nav-btn span{width:24px;height:2px;background:#fff;display:block}
  .nav{position:absolute;top:68px;left:0;right:0;flex-direction:column;gap:0;background:var(--navy-deep);border-bottom:1px solid var(--line);display:none}
  .nav a{padding:16px 24px;width:100%;border-top:1px solid var(--line)}
  .nav a.active{box-shadow:inset 3px 0 0 var(--blue)}
  .nav-toggle:checked ~ .nav{display:flex}
  .hero{padding:52px 0 120px}
  .brand img.word{height:20px}
  .hero .product{letter-spacing:.2em;padding-left:.2em;font-size:14px}
  .hero .tagline{letter-spacing:.3em;padding-left:.3em}
}