/* Pha Lê Lập Phương — bảng màu lấy từ logo (cam · vàng · xanh, cùng mã với quaf-website),
   đặt trên nền trắng ngọc lạnh để gợi cảm giác trong trẻo, sang của pha lê. */
:root{
  --ink:#141a22; --ink-2:#3a4552; --muted:#6d7886;
  --orange:#f95a1e; --orange-d:#d6430c; --yellow:#f5e215; --cyan:#68d0e3; --cyan-d:#1f9cb6;
  --bg:#f6f8fb; --surface:#ffffff; --line:#e3e8ef; --glass:rgba(255,255,255,.72);
  --spectrum:linear-gradient(90deg,var(--orange) 0%,#f7a21a 30%,var(--yellow) 50%,#9fe0ea 72%,var(--cyan) 100%);
  --radius:18px;
  --shadow:0 1px 2px rgba(20,26,34,.05),0 10px 30px rgba(20,26,34,.07);
  --font-body:"Be Vietnam Pro",system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;
  --font-head:"Playfair Display",Georgia,"Times New Roman",serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;font:400 16px/1.75 var(--font-body);color:var(--ink-2);background:var(--bg);
  background-image:
    radial-gradient(900px 500px at 8% -10%,rgba(249,90,30,.07),transparent 60%),
    radial-gradient(800px 520px at 100% 0%,rgba(104,208,227,.12),transparent 60%),
    radial-gradient(700px 420px at 50% 110%,rgba(245,226,21,.08),transparent 60%);
  background-attachment:fixed;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;height:auto;display:block}
a{color:var(--cyan-d);text-underline-offset:3px}
a:hover{color:var(--orange-d)}
.wrap{max-width:1120px;margin:0 auto;padding:0 16px}
h1,h2{font-family:var(--font-head);color:var(--ink);font-weight:600;letter-spacing:-.01em}
h1{font-size:clamp(1.7rem,1.2rem + 2vw,2.6rem);line-height:1.2;margin:1.6rem 0 .8rem}
h2{font-size:clamp(1.35rem,1.1rem + 1vw,1.85rem);line-height:1.3;margin:2rem 0 .7rem}
h3,h4,h5,h6{color:var(--ink);line-height:1.4;font-weight:600}
/* Wix dùng h5/h6 cho mô tả + giá sản phẩm (gốc 20–24px) — mặc định trình duyệt chỉ ~11px */
h3{font-size:1.3rem} h4{font-size:1.2rem} h5,h6{font-size:1.12rem;margin:.6em 0}
strong,b{color:var(--ink);font-weight:600}
.muted{color:var(--muted)}
::selection{background:rgba(104,208,227,.35)}

/* ---------- header: kính mờ + đường viền quang phổ ---------- */
.top{position:sticky;top:0;z-index:20;background:var(--glass);-webkit-backdrop-filter:saturate(1.6) blur(16px);backdrop-filter:saturate(1.6) blur(16px)}
.top::after{content:"";display:block;height:2px;background:var(--spectrum);opacity:.85}
.top-row{display:flex;align-items:center;gap:16px;min-height:68px}
.logo{display:flex;align-items:center;gap:12px;text-decoration:none;color:var(--ink);line-height:1.1}
.logo img{width:44px;height:44px;border-radius:50%;object-fit:cover;box-shadow:0 0 0 2px #fff,0 0 0 3px rgba(104,208,227,.5)}
.logo span{font-family:var(--font-head);font-size:1.08rem;letter-spacing:.01em}
.logo b{font-weight:700}
.nav-main{margin-left:auto;display:flex;gap:2px;align-items:center;flex-wrap:wrap}
.nav-main a{padding:8px 12px;text-decoration:none;color:var(--ink-2);border-radius:999px;font-size:.95rem;font-weight:500}
.nav-main a:hover{background:rgba(104,208,227,.14);color:var(--ink)}
.nav-main .hot{color:#fff;background:var(--ink);margin-left:6px;font-weight:600}
.nav-main .hot:hover{background:#000;color:#fff}
.menu-btn{display:none;margin-left:auto;font-size:1.5rem;background:none;border:0;cursor:pointer;padding:8px;color:var(--ink)}
.nav-prod{border-top:1px solid rgba(20,26,34,.06)}
.nav-prod .wrap{display:flex;align-items:center;gap:4px;overflow-x:auto;scrollbar-width:none;padding-top:6px;padding-bottom:6px}
.nav-prod .wrap::-webkit-scrollbar{display:none}
.nav-prod a{color:var(--ink);text-decoration:none;padding:6px 14px;white-space:nowrap;font-weight:600;letter-spacing:.14em;font-size:.78rem;border-radius:999px;border:1px solid transparent}
.nav-prod a:hover{border-color:rgba(104,208,227,.6);background:#fff}
.nav-prod .cta{margin-left:auto;letter-spacing:.06em;font-size:.88rem;color:#fff;background:linear-gradient(135deg,var(--orange),#f7871a);box-shadow:0 6px 16px rgba(249,90,30,.28)}
.nav-prod .cta:hover{color:#fff;filter:brightness(1.05)}

@media (max-width:760px){
  .menu-btn{display:block}
  .nav-main{display:none;position:absolute;left:0;right:0;top:68px;background:#fff;flex-direction:column;align-items:stretch;padding:8px 16px 14px;border-bottom:1px solid var(--line);box-shadow:var(--shadow)}
  .nav-main .hot{margin:6px 0 0;text-align:center}
  .nav-open .nav-main{display:flex}
}

/* ---------- nội dung ---------- */
main{padding-bottom:56px;min-height:60vh}
.rt{margin:.4rem auto;overflow-wrap:anywhere;max-width:820px}
.rt p{margin:.5em 0}
.rt ul,.rt ol{padding-left:1.3em}
.rt h2,.rt h3{text-align:inherit}
.pic{margin:22px auto;max-width:760px}
.pic img,.rt img{border-radius:var(--radius);margin:0 auto;box-shadow:var(--shadow)}
.rt img{margin:14px auto}
.gallery{display:grid;grid-template-columns:repeat(auto-fill,minmax(170px,1fr));gap:10px;margin:22px 0}
.g-item{border-radius:14px;overflow:hidden;background:#fff;box-shadow:var(--shadow)}
.g-item img{aspect-ratio:1/1;object-fit:cover;width:100%;transition:transform .5s ease}
.g-item:hover img{transform:scale(1.04)}
.video{position:relative;aspect-ratio:16/9;max-width:820px;margin:22px auto;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.video iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.btn-row{text-align:center;margin:18px 0}
.btn{display:inline-block;background:var(--ink);color:#fff;text-decoration:none;padding:12px 26px;border-radius:999px;font-weight:600;border:0;cursor:pointer;font:600 1rem var(--font-body);letter-spacing:.02em;position:relative;transition:transform .15s ease,box-shadow .2s ease}
.btn::after{content:"";position:absolute;left:18px;right:18px;bottom:-1px;height:2px;border-radius:2px;background:var(--spectrum)}
.btn:hover{color:#fff;transform:translateY(-1px);box-shadow:0 10px 24px rgba(20,26,34,.22)}
.btn.big{padding:15px 32px;font-size:1.05rem}
.btn[disabled]{opacity:.6;cursor:wait}

/* ---------- blog ---------- */
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:20px;margin:20px 0}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;text-decoration:none;color:var(--ink-2);display:flex;flex-direction:column;transition:transform .2s ease,box-shadow .2s ease}
.card:hover{transform:translateY(-3px);box-shadow:0 16px 36px rgba(20,26,34,.1);color:var(--ink-2)}
.card img{aspect-ratio:16/10;object-fit:cover;width:100%}
.card div{padding:14px 16px 16px}
.card h3{margin:0 0 6px;font:600 1.12rem/1.35 var(--font-head);color:var(--ink)}
.card p{margin:4px 0;font-size:.92rem}
.cats{display:flex;flex-wrap:wrap;gap:8px;margin:10px 0 6px}
.tag{display:inline-block;font-size:.83rem;padding:4px 12px;border-radius:999px;background:#fff;border:1px solid var(--line);color:var(--ink-2);text-decoration:none}
.tag:hover{border-color:var(--cyan);color:var(--ink)}
.tag.on{background:var(--ink);border-color:var(--ink);color:#fff}
.crumbs{margin:22px 0 0;font-size:.85rem;letter-spacing:.08em;text-transform:uppercase}
.crumbs a{color:var(--muted);text-decoration:none}
.meta{color:var(--muted);font-size:.9rem}
.post{max-width:820px;margin:0 auto}
.cta-box{max-width:820px;margin:40px auto;padding:28px 22px;border-radius:var(--radius);text-align:center;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);position:relative;overflow:hidden}
.cta-box::before{content:"";position:absolute;inset:0 0 auto 0;height:3px;background:var(--spectrum)}
.cta-box p{margin:0 0 14px;font:600 1.2rem var(--font-head);color:var(--ink)}

/* ---------- sản phẩm ---------- */
.prod{display:grid;grid-template-columns:1.1fr 1fr;gap:32px;align-items:start;margin-top:8px}
.prod .gallery{grid-template-columns:repeat(2,1fr);margin-top:0}
.price{font:700 1.5rem var(--font-body);color:var(--orange-d);margin:6px 0 10px;letter-spacing:-.01em}
@media (max-width:760px){.prod{grid-template-columns:1fr}}

/* ---------- FAQ ---------- */
.faq{background:#fff;border:1px solid var(--line);border-radius:14px;margin:12px auto;padding:0 20px;max-width:820px}
.faq summary{cursor:pointer;font-weight:600;padding:16px 0;color:var(--ink);list-style:none;display:flex;justify-content:space-between;gap:12px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-size:1.3rem;line-height:1;color:var(--cyan-d)}
.faq[open] summary::after{content:"–"}
.faq[open] summary{border-bottom:1px solid var(--line)}

/* ---------- form đặt hàng: khung kính, viền quang phổ ---------- */
.order{position:relative;background:var(--glass);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-radius:22px;padding:28px 24px;margin:44px auto;max-width:820px;scroll-margin-top:120px;box-shadow:0 20px 50px rgba(20,26,34,.1)}
.order::before{content:"";position:absolute;inset:0;border-radius:22px;padding:1.5px;background:var(--spectrum);-webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);-webkit-mask-composite:xor;mask-composite:exclude;pointer-events:none}
.order h2{margin-top:0;text-align:center}
.order > .muted{text-align:center;margin-top:-4px}
#order-form{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:18px}
#order-form label{display:flex;flex-direction:column;gap:6px;font-weight:600;font-size:.88rem;color:var(--ink)}
#order-form .full,#order-form .btn,#order-form .form-msg{grid-column:1/-1}
#order-form .btn{justify-self:center;min-width:240px;margin-top:6px}
#order-form input,#order-form select,#order-form textarea{font:400 1rem var(--font-body);padding:11px 14px;border:1px solid #d7dee7;border-radius:12px;background:#fff;width:100%;color:var(--ink);transition:border-color .15s,box-shadow .15s}
#order-form input:focus,#order-form select:focus,#order-form textarea:focus{outline:0;border-color:var(--cyan);box-shadow:0 0 0 4px rgba(104,208,227,.22)}
#order-form input[type=file]{padding:9px}
#order-form .hp{position:absolute;left:-9999px;width:1px;height:1px}
.form-msg{margin:0;font-weight:600;text-align:center}
.form-msg.err{color:#c0321a}
.form-msg.ok{color:var(--cyan-d)}
@media (max-width:600px){#order-form{grid-template-columns:1fr}.order{padding:22px 16px}}

/* ---------- chân trang + nút nổi ---------- */
.foot{background:#10151c;color:#b9c3cf;padding:34px 0 96px;font-size:.92rem;position:relative}
.foot::before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:var(--spectrum)}
.foot a{color:#fff}
.foot-links{margin-bottom:12px;font-weight:600;letter-spacing:.02em}
.foot-text p{margin:.2em 0}
.float{position:fixed;right:16px;bottom:16px;display:flex;flex-direction:column;gap:10px;z-index:30}
.float a{width:52px;height:52px;border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;text-decoration:none;font-weight:700;font-size:.82rem;box-shadow:0 8px 20px rgba(20,26,34,.25),inset 0 1px 0 rgba(255,255,255,.35)}
.f-zalo{background:linear-gradient(145deg,#2b8cff,#0060e6)}
.f-call{background:linear-gradient(145deg,var(--orange),#f7871a);font-size:1.25rem}

/* ---------- xem ảnh lớn ---------- */
.lb{position:fixed;inset:0;background:rgba(10,14,20,.9);-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);display:flex;align-items:center;justify-content:center;z-index:50;cursor:zoom-out}
.lb img{max-width:94vw;max-height:92vh;border-radius:10px}