:root{
  --blue:#0a84ff; --blue-dark:#0662c7; --ink:#0f172a; --muted:#5b6475; --line:#e6e9f0;
  --bg:#ffffff; --soft:#f4f7fc; --card:#ffffff; --ok:#16a34a; --radius:18px;
  --shadow:0 10px 30px rgba(15,23,42,.08);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;color:var(--ink);background:var(--bg);line-height:1.6;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:var(--blue);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:1120px;margin:0 auto;padding:0 20px}
section{padding:72px 0}
h1,h2,h3{line-height:1.2;margin:0 0 12px;letter-spacing:-.02em}
h1{font-size:clamp(34px,5.4vw,56px);font-weight:800}
h2{font-size:clamp(26px,3.6vw,38px);font-weight:800}
h3{font-size:19px;font-weight:700}
p{margin:0 0 12px}
.lead{font-size:clamp(17px,2vw,20px);color:var(--muted);max-width:620px}
.center{text-align:center}.center .lead{margin-left:auto;margin-right:auto}
.eyebrow{display:inline-block;font-size:13px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--blue);margin-bottom:10px}

/* Header */
header{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.88);backdrop-filter:saturate(180%) blur(12px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:19px;color:var(--ink)}
.brand img{width:34px;height:34px;border-radius:9px}
.nav ul{display:flex;gap:26px;list-style:none;margin:0;padding:0}
.nav ul a{color:var(--ink);font-weight:500;font-size:15px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:13px 22px;border-radius:12px;font-weight:700;font-size:16px;border:1.5px solid transparent;cursor:pointer;transition:transform .08s,background .15s}
.btn:hover{text-decoration:none;transform:translateY(-1px)}
.btn-primary{background:var(--blue);color:#fff}.btn-primary:hover{background:var(--blue-dark)}
.btn-ghost{background:#fff;color:var(--ink);border-color:var(--line)}
.btn-store{background:#000;color:#fff}.btn-store:hover{background:#1f2937;color:#fff}
.btn-sm{padding:9px 16px;font-size:14px;border-radius:10px}

/* Hero */
.hero{padding:64px 0 40px;background:radial-gradient(1200px 500px at 80% -10%,#dbeafe 0,transparent 60%),linear-gradient(#fff,var(--soft))}
.hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:40px;align-items:center}
.hero .cta{display:flex;flex-wrap:wrap;gap:12px;margin:26px 0 14px}
.note{font-size:14px;color:var(--muted)}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:22px}
.chip{background:#fff;border:1px solid var(--line);border-radius:999px;padding:6px 13px;font-size:14px;font-weight:600;color:#334155}

/* Phone mockup (dữ liệu mẫu, không phải khách thật) */
.phone{width:290px;margin:0 auto;border-radius:42px;background:#0b1220;padding:11px;box-shadow:0 30px 60px rgba(15,23,42,.28)}
.screen{background:#fff;border-radius:32px;overflow:hidden;height:560px;display:flex;flex-direction:column}
.status{display:flex;justify-content:space-between;padding:12px 20px 4px;font-size:12px;font-weight:700}
.app-title{padding:6px 16px 8px;font-weight:800;color:var(--blue);font-size:22px}
.row{display:flex;gap:10px;align-items:center;padding:10px 14px}
.av{width:40px;height:40px;border-radius:50%;flex:none;display:grid;place-items:center;color:#fff;font-weight:700;font-size:15px}
.row .t{font-size:13.5px;font-weight:700;line-height:1.2}
.row .s{font-size:12px;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:170px}
.badge{margin-left:auto;background:var(--blue);color:#fff;border-radius:999px;font-size:11px;font-weight:700;padding:2px 7px}
.chat{flex:1;background:#fff;padding:10px 12px;display:flex;flex-direction:column;gap:6px;font-size:12.5px}
.msg{max-width:78%;padding:8px 12px;border-radius:18px;background:#eef1f6}
.msg.me{align-self:flex-end;background:var(--blue);color:#fff}
.msg.ai{align-self:flex-end;background:#ecfdf3;color:#14532d;border:1px dashed #86efac}
.tabs{display:flex;justify-content:space-around;padding:8px 10px 14px;border-top:1px solid var(--line);font-size:10.5px;color:var(--muted)}
.tabs b{color:var(--blue)}
.mock-split{display:grid;gap:18px}

/* Cards / grids */
.grid{display:grid;gap:18px}
.g3{grid-template-columns:repeat(3,1fr)}.g4{grid-template-columns:repeat(4,1fr)}.g2{grid-template-columns:repeat(2,1fr)}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow)}
.card .ic{width:44px;height:44px;border-radius:12px;background:#e8f1ff;display:grid;place-items:center;font-size:22px;margin-bottom:14px}
.card p{color:var(--muted);font-size:15.5px;margin:0}
.soft{background:var(--soft)}
.stat{font-size:34px;font-weight:800;color:var(--blue)}
.steps{counter-reset:s}
.step{position:relative;padding-left:56px}
.step:before{counter-increment:s;content:counter(s);position:absolute;left:0;top:0;width:40px;height:40px;border-radius:50%;background:var(--blue);color:#fff;display:grid;place-items:center;font-weight:800}

/* Pricing */
.plan{display:flex;flex-direction:column}
.plan.pop{border:2px solid var(--blue);position:relative}
.plan.pop:before{content:"Phổ biến";position:absolute;top:-13px;left:24px;background:var(--blue);color:#fff;font-size:12px;font-weight:700;padding:3px 12px;border-radius:999px}
.price{font-size:32px;font-weight:800;margin:6px 0 2px}.price small{font-size:14px;font-weight:500;color:var(--muted)}
.plan ul{list-style:none;padding:0;margin:14px 0 20px;flex:1}
.plan li{padding:5px 0 5px 24px;position:relative;font-size:14.5px}
.plan li:before{content:"✓";position:absolute;left:0;color:var(--ok);font-weight:800}
.fine{font-size:13.5px;color:var(--muted);margin-top:18px}

/* FAQ */
details{background:#fff;border:1px solid var(--line);border-radius:14px;padding:16px 20px;margin-bottom:12px}
summary{cursor:pointer;font-weight:700;list-style:none}
summary::-webkit-details-marker{display:none}
summary:after{content:"+";float:right;font-size:22px;line-height:1;color:var(--blue)}
details[open] summary:after{content:"–"}
details p{margin:10px 0 0;color:var(--muted)}

/* CTA + footer */
.cta-band{background:linear-gradient(135deg,#0a84ff,#0b3fa8);color:#fff;border-radius:28px;padding:56px 28px;text-align:center}
.cta-band .lead{color:#dbeafe;margin:0 auto 24px}
.cta-band .btn-primary{background:#fff;color:var(--blue-dark)}
footer{padding:36px 0 50px;border-top:1px solid var(--line);color:var(--muted);font-size:14px}
.foot{display:flex;flex-wrap:wrap;gap:16px;justify-content:space-between;align-items:center}
.foot a{color:var(--muted);margin-left:18px}

@media (max-width:900px){
  .hero-grid,.g2{grid-template-columns:1fr}
  .g3,.g4{grid-template-columns:1fr 1fr}
  .nav ul{display:none}
}
@media (max-width:560px){
  section{padding:52px 0}
  .g3,.g4{grid-template-columns:1fr}
  .foot a{margin:0 14px 0 0}
}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}.btn{transition:none}}

/* ===== Sơ đồ kết nối: kênh → đội CSKH → AI & ứng dụng ===== */
.diagram-sec{background:linear-gradient(#fff,var(--soft))}
.diagram{position:relative;display:grid;grid-template-columns:1fr 250px 1.08fr;gap:76px;align-items:center;margin-top:44px}
.dg-col h3{font-size:13px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin:0 0 14px;font-weight:700}
.dg-col.right{display:flex;flex-direction:column}
.dg-list{display:flex;flex-direction:column;gap:10px}
.node{position:relative;z-index:2;display:flex;align-items:center;gap:12px;background:#fff;border:1px solid var(--line);border-radius:14px;padding:10px 14px;box-shadow:0 4px 14px rgba(15,23,42,.05);font-weight:600;font-size:15px}
.node small{display:block;font-weight:500;color:var(--muted);font-size:12.5px;line-height:1.3}
.logo{width:36px;height:36px;border-radius:10px;display:grid;place-items:center;color:#fff;font-weight:800;font-size:16px;flex:none}
.hub{position:relative;z-index:2;text-align:center;background:#fff;border:2px solid var(--blue);border-radius:26px;padding:22px 16px;box-shadow:0 18px 40px rgba(10,132,255,.18)}
.hub .team{display:flex;justify-content:center;margin-bottom:10px}
.hub .team span{width:44px;height:44px;border-radius:50%;border:3px solid #fff;display:grid;place-items:center;color:#fff;font-weight:700;margin-left:-10px;font-size:16px}
.hub .team span:first-child{margin-left:0}
.hub b{display:block;font-size:18px}
.hub p{font-size:13.5px;color:var(--muted);margin:6px 0 0}
.hub .app{display:inline-flex;align-items:center;gap:8px;margin-top:12px;background:#e8f1ff;color:var(--blue-dark);font-weight:700;font-size:13px;padding:6px 12px;border-radius:999px}
.hub .app img{width:20px;height:20px;border-radius:6px}
.nlm{position:relative;z-index:2;border-radius:20px;padding:2px;background:linear-gradient(135deg,#f59e0b,#ef4444 40%,#8b5cf6 75%,#0a84ff);box-shadow:0 18px 44px rgba(139,92,246,.28);margin-bottom:16px}
.nlm-in{background:#fff;border-radius:18px;padding:16px 18px}
.nlm-top{display:flex;align-items:center;gap:12px}
.nlm .logo{width:46px;height:46px;border-radius:13px;font-size:20px;background:linear-gradient(135deg,#4f46e5,#0a84ff)}
.nlm h4{margin:0;font-size:19px;letter-spacing:-.01em}
.tag{display:inline-block;background:#111827;color:#fde68a;font-size:11.5px;font-weight:800;letter-spacing:.04em;text-transform:uppercase;padding:3px 9px;border-radius:999px;margin-bottom:5px}
.nlm p{font-size:14px;color:var(--muted);margin:10px 0 0}
.nlm ul{margin:10px 0 0;padding:0;list-style:none;font-size:13.5px}
.nlm li{padding:2px 0 2px 22px;position:relative}
.nlm li:before{content:"✓";position:absolute;left:0;color:var(--ok);font-weight:800}
.dg-grid{display:grid;grid-template-columns:1fr;gap:9px}
.dg-grid .node{padding:9px 11px;font-size:14px}
.dg-grid .logo{width:30px;height:30px;font-size:13px;border-radius:8px}
.dg-lines{position:absolute;inset:0;width:100%;height:100%;z-index:1;pointer-events:none;overflow:visible}
.dg-lines path{fill:none;stroke:#b7c6e2;stroke-width:1.6}
.dg-lines path.hot{stroke:url(#hotg);stroke-width:3.2;stroke-dasharray:7 7;animation:flow 1.1s linear infinite}
.dg-lines path.flow{stroke:#9db8ea;stroke-dasharray:5 7;animation:flow 1.6s linear infinite}
@keyframes flow{to{stroke-dashoffset:-28}}
.dg-note{margin-top:30px;text-align:center;color:var(--muted);font-size:14.5px}
@media (max-width:980px){
  .diagram{grid-template-columns:1fr;gap:26px}
  .dg-lines{display:none}
  .dg-col.left{order:0}.dg-arrow.a1{order:1}.dg-col.mid{order:2}.dg-arrow.a2{order:3}.dg-col.right{order:4}
  .dg-list{display:grid;grid-template-columns:1fr 1fr}
  .dg-grid{grid-template-columns:1fr 1fr}
  .dg-col.left h3,.dg-col.right h3{text-align:center}
  .hub{max-width:320px;margin:0 auto}
  .dg-arrow{display:block;text-align:center;font-size:26px;color:var(--blue);line-height:1}
}
@media (min-width:981px){.dg-arrow{display:none}}
@media (max-width:420px){.dg-list{grid-template-columns:1fr}.dg-grid{grid-template-columns:1fr}}
@media (prefers-reduced-motion:reduce){.dg-lines path.hot,.dg-lines path.flow{animation:none}}

/* Hero và mục Ứng dụng không còn ảnh điện thoại → một cột, căn giữa */
.hero-grid.solo{grid-template-columns:1fr;text-align:center;justify-items:center}
.hero-grid.solo .lead{margin-left:auto;margin-right:auto}
.hero-grid.solo .chips{justify-content:center}
#ung-dung .hero-grid ul{display:inline-block;text-align:left}

.btn-android{background:#16a34a;color:#fff;display:inline-flex;align-items:center;gap:8px}.btn-android:hover{background:#15803d;color:#fff}
.android-box{margin-top:26px;padding:22px 22px 18px;border:1px solid var(--line,#e5e7eb);border-radius:16px;background:#f8fafc;max-width:640px}
.android-box h3{margin:0;font-size:20px;display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.badge-beta{font-size:12px;font-weight:700;color:#b45309;background:#fef3c7;border-radius:999px;padding:3px 10px}
.android-steps{margin:0;padding-left:20px;color:var(--muted);line-height:1.8}
.sha{font-size:11px;word-break:break-all;background:#eef2f7;padding:2px 6px;border-radius:6px}
.android-box{text-align:left}.android-box .android-steps li{text-align:left}

/* ---- Khu tải ứng dụng ---- */
.dl-sec{background:linear-gradient(180deg,#f4f7fc 0,#fff 100%)}
.dl-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-top:34px;align-items:stretch}
.dl-card{position:relative;background:#fff;border:1px solid var(--line);border-radius:20px;padding:26px 22px 20px;box-shadow:var(--shadow);display:flex;flex-direction:column;transition:transform .2s,box-shadow .2s}
.dl-card:hover{transform:translateY(-3px);box-shadow:0 16px 38px rgba(15,23,42,.13)}
.dl-card.is-you{border-color:var(--blue);box-shadow:0 0 0 3px rgba(10,132,255,.16),var(--shadow)}
.dl-you{display:none;position:absolute;top:-11px;left:50%;transform:translateX(-50%);white-space:nowrap;font-size:12px;font-weight:700;color:#fff;background:var(--blue);padding:3px 12px;border-radius:999px}
.dl-card.is-you .dl-you{display:block}
.dl-ico{width:56px;height:56px;border-radius:15px;display:flex;align-items:center;justify-content:center;color:#fff;margin-bottom:14px}
.dl-ico-ios{background:#111}.dl-ico-android{background:#16a34a}.dl-ico-mac{background:linear-gradient(135deg,#6b7280,#374151)}.dl-ico-windows{background:linear-gradient(135deg,#0a84ff,#0662c7)}
.dl-card h3{margin:0;font-size:21px}
.dl-sub{margin:6px 0 0;color:var(--muted);font-size:14.5px;min-height:44px}
.dl-meta{margin:12px 0 16px;font-size:13px;color:var(--muted);padding:8px 10px;background:var(--soft);border-radius:10px}
.dl-btn{width:100%}
.dl-how{margin-top:auto;font-size:14px;border-top:1px solid var(--line);padding-top:10px}
.dl-how summary{cursor:pointer;font-weight:600;color:var(--blue)}
.dl-how ol{margin:10px 0 0;padding-left:18px;color:var(--muted);line-height:1.65}
.dl-how li{margin-bottom:6px}
.dl-sha{margin:10px 0 0;font-size:12px;color:var(--muted);word-break:break-all}
.dl-feats{list-style:none;margin:36px auto 0;padding:0;display:grid;grid-template-columns:repeat(3,1fr);gap:12px 28px;max-width:960px}
.dl-feats li{position:relative;padding-left:26px;color:var(--muted);font-size:15px}
.dl-feats li:before{content:"";position:absolute;left:0;top:7px;width:14px;height:14px;border-radius:50%;background:var(--ok) no-repeat center/9px url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 12'%3E%3Cpath d='M2.5 6.2l2.2 2.2 4.8-4.8' fill='none' stroke='%23fff' stroke-width='1.8' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E")}
@media (max-width:1040px){.dl-grid{grid-template-columns:repeat(2,1fr)}.dl-feats{grid-template-columns:repeat(2,1fr)}}
@media (max-width:620px){.dl-grid{grid-template-columns:1fr}.dl-feats{grid-template-columns:1fr}.dl-sub{min-height:0}}
@media (prefers-reduced-motion:reduce){.dl-card{transition:none}.dl-card:hover{transform:none}}

.was-row{display:flex;align-items:center;gap:8px;font-size:14px;font-weight:500;margin-bottom:2px}.was{color:var(--muted);font-weight:500}.off{background:#fee2e2;color:#dc2626;font-size:12px;font-weight:700;padding:1px 8px;border-radius:999px}