/* ============================================================
   Bling Tech Phú Quốc — design system
   Palette: Mộc (green) dominant + Hỏa (orange) accent, no Thủy.
   Sửa MÀU tại các biến --* bên dưới nếu cần.
   ============================================================ */
:root{
  --ink:#17211C;          /* chữ chính, đen ấm ngả lục */
  --moss:#2F4A2B;         /* xanh rêu đậm — tiêu đề, wordmark */
  --green:#15803D;        /* Mộc — nút, mark, nhấn chính */
  --green-deep:#14532D;
  --green-soft:#E7EFE6;   /* nền nhấn nhạt */
  --ember:#EA580C;        /* Hỏa — điểm nhấn, dùng tiết chế */
  --ember-soft:#FBEAE0;
  --paper:#F5F7F1;        /* nền trang, trắng ngả lục */
  --card:#FFFFFF;
  --line:#E2E7DB;         /* hairline */
  --muted:#5C6356;        /* chữ phụ */
  --muted-2:#8A9081;

  --display:Arial,Helvetica,'Helvetica Neue',system-ui,sans-serif;
  --sans:Arial,Helvetica,'Helvetica Neue',system-ui,sans-serif;

  --maxw:1120px;
  --pad:clamp(20px,5vw,64px);
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--sans);
  color:var(--ink);
  background:var(--paper);
  line-height:1.65;
  font-size:17px;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
img,svg{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
::selection{background:var(--green);color:#fff}

/* ---- layout helpers ---- */
.wrap{max-width:var(--maxw);margin-inline:auto;padding-inline:var(--pad)}
.section{padding-block:clamp(56px,9vw,110px)}
.eyebrow{
  font-size:12px;font-weight:600;letter-spacing:.22em;text-transform:uppercase;
  color:var(--green);display:inline-flex;align-items:center;gap:10px;margin-bottom:20px;
}
.eyebrow::before{content:"";width:22px;height:2px;background:var(--ember);border-radius:2px}
h1,h2,h3{font-family:var(--sans);font-weight:700;line-height:1.14;color:var(--moss);letter-spacing:-.02em}
h2{font-size:clamp(28px,4.2vw,44px)}
h3{font-size:clamp(20px,2.4vw,25px)}
p.lead{font-size:clamp(18px,2.2vw,21px);color:var(--muted);max-width:60ch}

/* ---- converge divider (signature motif) ---- */
.converge-rule{display:flex;align-items:center;justify-content:center;gap:0;height:24px;opacity:.8}
.converge-rule svg{overflow:visible}

/* ============================================================
   Header
   ============================================================ */
.site-head{
  position:sticky;top:0;z-index:50;
  background:color-mix(in srgb,var(--paper) 86%,transparent);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.site-head .wrap{display:flex;align-items:center;justify-content:space-between;height:70px}
.brand{display:flex;align-items:center}
.brand svg{height:42px;width:auto}
.nav{display:flex;align-items:center;gap:30px}
.nav a.navlink{font-size:15px;font-weight:500;color:var(--ink);opacity:.82;transition:opacity .2s}
.nav a.navlink:hover{opacity:1;color:var(--green-deep)}
.lang{display:flex;align-items:center;gap:6px;font-size:13px;font-weight:600;color:var(--muted)}
.lang a{padding:3px 8px;border-radius:6px;transition:.2s}
.lang a[aria-current="true"]{background:var(--green);color:#fff}
.lang a:not([aria-current="true"]):hover{background:var(--green-soft);color:var(--green-deep)}
.menu-btn{display:none}

/* ============================================================
   Hero
   ============================================================ */
.hero{position:relative;overflow:hidden}
.hero .wrap{padding-top:clamp(48px,8vw,96px);padding-bottom:clamp(56px,9vw,110px)}
.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:clamp(32px,5vw,72px);align-items:center}
.hero h1{font-size:clamp(34px,5.4vw,60px);margin-bottom:24px}
.hero h1 .em{color:var(--green)}
.hero .sub{font-size:clamp(17px,2vw,20px);color:var(--muted);max-width:44ch;margin-bottom:34px}
.hero-cta{display:flex;flex-wrap:wrap;gap:14px}

.btn{
  display:inline-flex;align-items:center;gap:9px;
  font-family:var(--sans);font-size:15px;font-weight:600;
  padding:13px 22px;border-radius:11px;cursor:pointer;border:1px solid transparent;
  transition:transform .15s ease,box-shadow .2s ease,background .2s;
}
.btn:active{transform:translateY(1px)}
.btn-primary{background:var(--green);color:#fff;box-shadow:0 1px 0 rgba(0,0,0,.04)}
.btn-primary:hover{background:var(--green-deep);box-shadow:0 8px 22px -10px rgba(21,128,61,.6)}
.btn-ghost{background:transparent;color:var(--green-deep);border-color:var(--line)}
.btn-ghost:hover{border-color:var(--green);background:var(--green-soft)}

/* four bullets — the first thing a GM scans */
.checklist{margin-top:36px;display:flex;flex-direction:column;gap:15px;max-width:70ch}
.check{display:flex;align-items:flex-start;gap:14px;font-size:clamp(16px,1.9vw,18.5px);color:var(--ink);line-height:1.45}
.check .ck{flex:0 0 26px;width:26px;height:26px;border-radius:50%;background:var(--green-soft);
  color:var(--green-deep);display:flex;align-items:center;justify-content:center;margin-top:2px}
.check .ck svg{width:15px;height:15px}
.check strong{color:var(--moss);font-weight:700}
.check.hot .ck{background:var(--green);color:#fff}
.check.hot{color:var(--green-deep);font-weight:600}

/* hero art: animated convergence */
.hero-art{display:flex;justify-content:center}
.hero-art svg{width:min(360px,80%);height:auto}
.src-dot,.flow{transform-box:fill-box;transform-origin:center}
@keyframes flowIn{from{opacity:0;transform:translateX(-26px)}to{opacity:1;transform:translateX(0)}}
@keyframes drawLine{from{stroke-dashoffset:280}to{stroke-dashoffset:0}}
@keyframes settle{0%{transform:scale(.7);opacity:0}60%{transform:scale(1.06)}100%{transform:scale(1);opacity:1}}
.hero-art .flow{stroke-dasharray:280;stroke-dashoffset:280;animation:drawLine 1.1s ease .3s forwards}
.hero-art .src-dot{opacity:0;animation:flowIn .7s ease forwards}
.hero-art .src-dot.d1{animation-delay:.15s}
.hero-art .src-dot.d2{animation-delay:.3s}
.hero-art .src-dot.d3{animation-delay:.45s}
.hero-art .unite{transform-box:fill-box;transform-origin:center;opacity:0;animation:settle .7s cubic-bezier(.34,1.4,.64,1) 1.2s forwards}
.hero-art .halo{transform-box:fill-box;transform-origin:center;animation:pulse 3.6s ease-in-out 2s infinite}
@keyframes pulse{0%,100%{opacity:.14;transform:scale(1)}50%{opacity:.05;transform:scale(1.12)}}

/* ============================================================
   Products
   ============================================================ */
.prod-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px;margin-top:44px}
.card{
  position:relative;background:var(--card);border:1px solid var(--line);border-radius:16px;
  padding:30px 30px 26px;transition:transform .18s ease,box-shadow .25s ease,border-color .2s;
  display:flex;flex-direction:column;
}
.card:hover{transform:translateY(-4px);box-shadow:0 18px 40px -24px rgba(23,33,28,.4);border-color:#D3DBCB}
.card .tag{display:flex;align-items:center;gap:9px;margin-bottom:16px}
.card .tag .spark{width:10px;height:10px;border-radius:3px;background:var(--green)}
.card:nth-child(3) .tag .spark{background:var(--ember)} /* one card carries the ember spark */
.card .kicker{font-size:12px;font-weight:600;letter-spacing:.14em;text-transform:uppercase;color:var(--muted-2)}
.card h3{margin-bottom:10px}
.card .desc{color:var(--muted);font-size:15.5px;margin-bottom:18px}
.card .problem{
  margin-top:auto;padding:13px 15px;border-left:3px solid var(--green);
  background:var(--green-soft);border-radius:0 10px 10px 0;
  font-size:14.5px;color:var(--green-deep);font-weight:500;
}
.card:nth-child(3) .problem{border-left-color:var(--ember);background:var(--ember-soft);color:#9A3412}

/* ============================================================
   About
   ============================================================ */
.about{background:var(--moss);color:#EAF0E6}
.about h2{color:#fff}
.about .eyebrow{color:#9FE3B4}
.about .eyebrow::before{background:var(--ember)}
.about-grid{display:grid;grid-template-columns:.9fr 1.1fr;gap:clamp(30px,5vw,70px);align-items:start}
.about p{color:#C9D6C4;font-size:17px;margin-top:18px;max-width:60ch}
.about .stat-row{display:flex;gap:38px;margin-top:36px;flex-wrap:wrap}
.about .stat b{font-family:var(--sans);font-size:34px;font-weight:700;color:#fff;display:block;line-height:1;letter-spacing:-.02em}
.about .stat span{font-size:13.5px;color:#9FB39A;letter-spacing:.02em}

/* ============================================================
   Contact
   ============================================================ */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:clamp(28px,4vw,56px);align-items:center}
.contact-list{display:flex;flex-direction:column;gap:4px}
.contact-item{display:flex;align-items:center;gap:16px;padding:16px 0;border-bottom:1px solid var(--line)}
.contact-item:last-child{border-bottom:0}
.contact-item .ic{
  width:44px;height:44px;flex:0 0 44px;border-radius:12px;background:var(--green-soft);
  display:flex;align-items:center;justify-content:center;color:var(--green-deep);
}
.contact-item .ic svg{width:20px;height:20px}
.contact-item .lbl{font-size:12.5px;color:var(--muted-2);letter-spacing:.04em;text-transform:uppercase}
.contact-item .val{font-size:16.5px;font-weight:500;color:var(--ink)}
.contact-item a.val:hover{color:var(--green)}

/* ============================================================
   Footer
   ============================================================ */
.site-foot{background:var(--ink);color:#B7BFB4;padding-block:52px 34px;font-size:14.5px}
.foot-top{display:flex;justify-content:space-between;gap:40px;flex-wrap:wrap;align-items:flex-start}
.site-foot .logo-mono svg{height:40px}
.site-foot .legal{max-width:52ch;line-height:1.75}
.site-foot .legal .co{color:#F0F2EC;font-weight:600;letter-spacing:.01em}
.foot-bottom{margin-top:36px;padding-top:22px;border-top:1px solid #2A322A;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:13px;color:#7E877C}

/* ============================================================
   Floating chat (Zalo + WhatsApp + Call). AI Agent / OA gắn sau.
   ============================================================ */
.chat-fab{position:fixed;right:20px;bottom:20px;z-index:80;display:flex;flex-direction:column;align-items:flex-end;gap:12px}
.chat-actions{display:flex;flex-direction:column;gap:10px;transform:translateY(10px);opacity:0;pointer-events:none;transition:.22s ease}
.chat-fab.open .chat-actions{transform:none;opacity:1;pointer-events:auto}
.chat-action{
  display:flex;align-items:center;gap:10px;background:var(--card);border:1px solid var(--line);
  padding:10px 16px 10px 12px;border-radius:30px;font-size:14px;font-weight:600;color:var(--ink);
  box-shadow:0 10px 30px -12px rgba(23,33,28,.5);transition:transform .15s
}
.chat-action:hover{transform:translateX(-3px)}
.chat-action .cdot{width:30px;height:30px;border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff}
.chat-action .cdot svg{width:16px;height:16px}
.cdot.zalo{background:#0068FF}
.cdot.wa{background:#25D366}
.cdot.call{background:var(--green)}
.chat-toggle{
  width:58px;height:58px;border-radius:50%;border:none;cursor:pointer;background:var(--green);color:#fff;
  box-shadow:0 12px 30px -8px rgba(21,128,61,.7);display:flex;align-items:center;justify-content:center;
  transition:transform .2s,background .2s
}
.chat-toggle:hover{background:var(--green-deep)}
.chat-fab.open .chat-toggle{transform:rotate(90deg)}
.chat-toggle svg{width:26px;height:26px}

/* ============================================================
   Reveal on scroll
   ============================================================ */
.reveal{opacity:0;transform:translateY(22px);transition:opacity .7s ease,transform .7s ease}
.reveal.in{opacity:1;transform:none}

/* ============================================================
   Focus + accessibility
   ============================================================ */
a:focus-visible,button:focus-visible{outline:2.5px solid var(--ember);outline-offset:3px;border-radius:6px}

/* ============================================================
   Responsive
   ============================================================ */
@media(max-width:980px){ .pillars{grid-template-columns:repeat(2,1fr)} }
@media(max-width:860px){
  .nav .navlink{display:none}
  .prod-grid{grid-template-columns:1fr}
  .about-grid,.contact-grid{grid-template-columns:1fr}
  .foot-top{flex-direction:column}
}
@media(max-width:560px){ .pillars{grid-template-columns:1fr} }

/* ============================================================
   Reduced motion
   ============================================================ */
@media(prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important;scroll-behavior:auto!important}
  .reveal{opacity:1;transform:none}
  .hero-art .flow{stroke-dashoffset:0}
  .hero-art .src-dot,.hero-art .unite{opacity:1}
}