/* ============ TOKENS ============ */
:root{
  --paper:#FFFFFF;
  --wash:#F3F6FB;
  --wash2:#E9EEF7;
  --card:#FFFFFF;
  --ink:#131C2B;
  --ink2:#485468;
  --muted:#7C879A;
  --line:#E1E7F0;
  --line2:#CBD5E4;
  --blue:#2F6BFF;
  --blue-d:#1B45B8;
  --blue-soft:#EAF0FF;
  --clay:#B4622F;
  --clay-soft:#FBEFE6;
  --green:#0E8A5F;
  --green-soft:#E6F4EE;
  --shadow:0 1px 2px rgba(19,28,43,.05), 0 12px 32px -12px rgba(19,28,43,.14);
  --shadow-lg:0 2px 4px rgba(19,28,43,.04), 0 32px 64px -24px rgba(19,28,43,.24);
  --r:14px;
  --maxw:1160px;
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI Variable Display","Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --mono:ui-monospace,"SF Mono",SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --paper:#0D1117;
    --wash:#131A25;
    --wash2:#1A2331;
    --card:#151D29;
    --ink:#E9EDF4;
    --ink2:#A9B4C4;
    --muted:#7C879A;
    --line:#232D3D;
    --line2:#334054;
    --blue:#5B8CFF;
    --blue-d:#8FB0FF;
    --blue-soft:#16233D;
    --clay:#DD9260;
    --clay-soft:#2A1E16;
    --green:#3FBF92;
    --green-soft:#102A22;
    --shadow:0 1px 2px rgba(0,0,0,.4), 0 12px 32px -12px rgba(0,0,0,.6);
    --shadow-lg:0 2px 4px rgba(0,0,0,.4), 0 32px 64px -24px rgba(0,0,0,.7);
  }
}
:root[data-theme="dark"]{
  --paper:#0D1117;
  --wash:#131A25;
  --wash2:#1A2331;
  --card:#151D29;
  --ink:#E9EDF4;
  --ink2:#A9B4C4;
  --muted:#7C879A;
  --line:#232D3D;
  --line2:#334054;
  --blue:#5B8CFF;
  --blue-d:#8FB0FF;
  --blue-soft:#16233D;
  --clay:#DD9260;
  --clay-soft:#2A1E16;
  --green:#3FBF92;
  --green-soft:#102A22;
  --shadow:0 1px 2px rgba(0,0,0,.4), 0 12px 32px -12px rgba(0,0,0,.6);
  --shadow-lg:0 2px 4px rgba(0,0,0,.4), 0 32px 64px -24px rgba(0,0,0,.7);
}

/* ============ BASE ============ */
*{box-sizing:border-box}
body{
  margin:0; background:var(--paper); color:var(--ink);
  font-family:var(--sans); font-size:16px; line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%}
a{color:var(--blue); text-decoration:none}
a:focus-visible,button:focus-visible{outline:2px solid var(--blue); outline-offset:3px; border-radius:6px}
h1,h2,h3,h4{margin:0; text-wrap:balance; letter-spacing:-.022em; line-height:1.15; font-weight:700}
p{margin:0}
.wrap{max-width:var(--maxw); margin:0 auto; padding:0 24px}

.eyebrow{
  font-family:var(--mono); font-size:11.5px; font-weight:600;
  letter-spacing:.14em; text-transform:uppercase; color:var(--blue);
}
.eyebrow.clay{color:var(--clay)}
.lead{color:var(--ink2); font-size:17.5px; line-height:1.62}

.band{padding:96px 0; border-top:1px solid var(--line)}
.band.tint{background:var(--wash)}
.band-head{display:flex; flex-direction:column; gap:14px; max-width:720px; margin-bottom:52px}
.band-head h2{font-size:clamp(28px,3.4vw,40px)}

.btn{
  display:inline-flex; align-items:center; gap:8px; padding:12px 22px;
  border-radius:10px; font-size:15px; font-weight:600; border:1px solid transparent;
  transition:transform .16s ease, box-shadow .16s ease, background .16s ease;
}
.btn-primary{background:var(--blue); color:#fff; box-shadow:0 6px 18px -6px rgba(47,107,255,.6)}
.btn-primary:hover{transform:translateY(-1px); box-shadow:0 10px 24px -8px rgba(47,107,255,.7)}
.btn-ghost{border-color:var(--line2); color:var(--ink); background:var(--card)}
.btn-ghost:hover{border-color:var(--blue); color:var(--blue)}

/* ============ NAV ============ */
.nav{
  position:sticky; top:0; z-index:50; background:color-mix(in srgb, var(--paper) 82%, transparent);
  backdrop-filter:saturate(180%) blur(14px); border-bottom:1px solid var(--line);
}
.nav-in{max-width:var(--maxw); margin:0 auto; padding:0 24px; height:62px; display:flex; align-items:center; gap:34px}
.brand{display:flex; align-items:center; gap:10px; color:var(--ink); font-weight:700; letter-spacing:-.02em; font-size:16.5px}
.brand small{font-family:var(--mono); font-size:10.5px; font-weight:600; letter-spacing:.1em; color:var(--muted); text-transform:uppercase; padding-top:2px}
.nav-links{display:flex; gap:26px; margin-left:auto}
.nav-links a{color:var(--ink2); font-size:14.5px; font-weight:500}
.nav-links a:hover{color:var(--ink)}
.nav .btn{padding:9px 16px; font-size:14px}

/* ============ HERO ============ */
.hero{position:relative; overflow:hidden; padding:76px 0 88px}
.hero::before{
  content:""; position:absolute; inset:-200px 0 auto -10%; height:620px; pointer-events:none;
  background:radial-gradient(52% 60% at 28% 42%, color-mix(in srgb,var(--blue) 16%, transparent) 0%, transparent 70%),
             radial-gradient(40% 50% at 82% 20%, color-mix(in srgb,var(--clay) 12%, transparent) 0%, transparent 68%);
}
.hero-grid{position:relative; display:grid; grid-template-columns:minmax(0,1.02fr) minmax(0,1.18fr); gap:56px; align-items:center}
.hero h1{font-size:clamp(34px,4.6vw,56px); letter-spacing:-.032em; margin:18px 0 20px}
.hero h1 em{font-style:normal; color:var(--blue)}
.hero-cta{display:flex; flex-wrap:wrap; gap:12px; margin-top:30px}
.hero-note{margin-top:18px; font-size:13.5px; color:var(--muted)}

.stats{display:grid; grid-template-columns:repeat(4,1fr); gap:0; margin-top:44px; border-top:1px solid var(--line)}
.stat{padding:20px 20px 0 0}
.stat b{display:block; font-size:29px; font-weight:700; letter-spacing:-.03em; font-variant-numeric:tabular-nums}
.stat span{font-size:12.5px; color:var(--muted); line-height:1.4; display:block; margin-top:3px}

/* ============ PRODUCT MOCK ============ */
.frame{
  border-radius:var(--r); overflow:hidden; border:1px solid var(--line);
  background:var(--card); box-shadow:var(--shadow-lg);
}
.frame-bar{
  display:flex; align-items:center; gap:7px; padding:10px 14px;
  background:var(--wash2); border-bottom:1px solid var(--line);
}
.dot{width:10px; height:10px; border-radius:50%; background:var(--line2)}
.frame-url{
  margin-left:10px; font-family:var(--mono); font-size:10.5px; color:var(--muted);
  background:var(--paper); border:1px solid var(--line); border-radius:6px; padding:3px 10px;
}
.app{display:grid; grid-template-columns:150px 1fr; min-height:352px; font-size:11px}
.app-side{border-right:1px solid var(--line); padding:12px 8px; background:var(--card)}
.side-group{font-family:var(--mono); font-size:8.5px; letter-spacing:.1em; color:var(--muted); padding:10px 8px 5px; text-transform:uppercase}
.side-item{display:flex; align-items:center; gap:7px; padding:6px 8px; border-radius:6px; color:var(--ink2)}
.side-item.on{background:var(--blue-soft); color:var(--blue); font-weight:600}
.side-ic{width:13px; height:13px; border-radius:4px; background:currentColor; opacity:.34; flex:none}
.side-item.on .side-ic{opacity:1}
.app-main{background:var(--wash); padding:14px}
.app-top{display:flex; align-items:center; justify-content:space-between; margin-bottom:12px}
.app-top b{font-size:13px; letter-spacing:-.02em}
.app-pill{font-family:var(--mono); font-size:9px; color:var(--muted); border:1px solid var(--line); border-radius:20px; padding:3px 9px; background:var(--card)}
.kpis{display:grid; grid-template-columns:repeat(3,1fr); gap:8px; margin-bottom:10px}
.kpi{background:var(--card); border:1px solid var(--line); border-radius:9px; padding:9px 10px}
.kpi i{display:block; width:20px; height:20px; border-radius:6px; margin-bottom:7px}
.kpi b{display:block; font-size:17px; letter-spacing:-.03em; font-variant-numeric:tabular-nums}
.kpi span{font-size:9px; color:var(--muted)}
.panel{background:var(--card); border:1px solid var(--line); border-radius:9px; padding:11px 12px}
.panel h5{margin:0 0 9px; font-size:10.5px; font-weight:600; letter-spacing:-.01em}
.row{display:flex; align-items:center; gap:9px; padding:5px 0}
.row+.row{border-top:1px dashed var(--line)}
.av{width:19px; height:19px; border-radius:50%; flex:none; background:var(--blue-soft); color:var(--blue); font-size:8px; font-weight:700; display:grid; place-items:center}
.row-n{flex:1; min-width:0; font-size:10px; overflow:hidden; text-overflow:ellipsis; white-space:nowrap}
.bar{width:74px; height:5px; border-radius:3px; background:var(--wash2); overflow:hidden; flex:none}
.bar i{display:block; height:100%; border-radius:3px; background:var(--blue)}
.pc{font-family:var(--mono); font-size:9px; color:var(--ink2); width:30px; text-align:right; font-variant-numeric:tabular-nums; flex:none}
.tag{font-size:8.5px; font-weight:600; padding:2px 7px; border-radius:20px; flex:none}
.tag.g{background:var(--green-soft); color:var(--green)}
.tag.c{background:var(--clay-soft); color:var(--clay)}
.tag.b{background:var(--blue-soft); color:var(--blue)}

/* ============ PROBLEM ============ */
.problems{display:grid; grid-template-columns:repeat(2,1fr); gap:1px; background:var(--line); border:1px solid var(--line); border-radius:var(--r); overflow:hidden}
.problem{background:var(--card); padding:30px 30px 32px}
.problem .n{font-family:var(--mono); font-size:11px; font-weight:600; color:var(--clay); letter-spacing:.1em}
.problem h3{font-size:19px; margin:12px 0 10px}
.problem p{color:var(--ink2); font-size:14.5px}
.problem .cost{
  margin-top:16px; padding-top:14px; border-top:1px dashed var(--line);
  font-size:13px; color:var(--muted);
}
.problem .cost b{color:var(--ink); font-weight:600}

/* ============ LIFECYCLE ============ */
.flow{display:flex; align-items:stretch; gap:0; overflow-x:auto; padding-bottom:8px; scrollbar-width:thin}
.step{
  flex:1 0 152px; background:var(--card); border:1px solid var(--line); border-radius:12px;
  padding:18px 16px 20px; position:relative; margin-right:26px;
}
.step:last-child{margin-right:0}
.step::after{
  content:""; position:absolute; right:-19px; top:50%; width:12px; height:12px;
  border-top:1.6px solid var(--line2); border-right:1.6px solid var(--line2);
  transform:translateY(-50%) rotate(45deg);
}
.step:last-child::after{display:none}
.step .k{font-family:var(--mono); font-size:10px; color:var(--muted); letter-spacing:.1em}
.step h4{font-size:15px; margin:9px 0 7px; letter-spacing:-.02em}
.step p{font-size:12.5px; color:var(--ink2); line-height:1.5}
.flow-foot{
  margin-top:24px; display:flex; align-items:center; gap:12px; flex-wrap:wrap;
  font-size:14px; color:var(--ink2); background:var(--blue-soft);
  border:1px solid color-mix(in srgb,var(--blue) 22%, transparent); border-radius:12px; padding:16px 20px;
}
.flow-foot b{color:var(--ink)}

/* ============ MODULES ============ */
.mods{display:grid; grid-template-columns:repeat(3,1fr); gap:18px}
.mod{
  background:var(--card); border:1px solid var(--line); border-radius:var(--r); padding:24px 24px 26px;
  transition:border-color .18s ease, transform .18s ease, box-shadow .18s ease;
}
.mod:hover{border-color:var(--line2); transform:translateY(-2px); box-shadow:var(--shadow)}
.mod .ic{width:34px; height:34px; border-radius:9px; display:grid; place-items:center; margin-bottom:14px}
.mod .ic svg{width:18px; height:18px}
.mod h3{font-size:16.5px; margin-bottom:9px}
.mod ul{margin:0; padding:0; list-style:none; display:flex; flex-wrap:wrap; gap:6px}
.mod li{font-size:12.5px; color:var(--ink2); background:var(--wash); border:1px solid var(--line); border-radius:7px; padding:4px 9px}

/* ============ DEEP DIVE ============ */
.dive{display:grid; grid-template-columns:minmax(0,1fr) minmax(0,1.1fr); gap:52px; align-items:center}
.dive+.dive{margin-top:88px; padding-top:88px; border-top:1px solid var(--line)}
.dive.rev .dive-copy{order:2}
.dive h3{font-size:clamp(23px,2.6vw,30px); margin:14px 0 14px}
.dive p{color:var(--ink2)}
.checks{list-style:none; margin:22px 0 0; padding:0; display:flex; flex-direction:column; gap:11px}
.checks li{display:flex; gap:11px; font-size:14.5px; color:var(--ink2)}
.checks svg{width:17px; height:17px; flex:none; margin-top:3px; color:var(--green)}
.checks b{color:var(--ink); font-weight:600}

.shot{border:1px solid var(--line); border-radius:var(--r); background:var(--card); box-shadow:var(--shadow); overflow:hidden}
.shot-h{padding:12px 16px; border-bottom:1px solid var(--line); background:var(--wash2); display:flex; align-items:center; justify-content:space-between}
.shot-h b{font-size:12.5px; letter-spacing:-.01em}
.shot-b{padding:16px}

.qz{display:flex; flex-direction:column; gap:9px}
.opt{display:flex; align-items:center; gap:11px; border:1px solid var(--line); border-radius:9px; padding:10px 13px; font-size:13px; color:var(--ink2)}
.opt i{width:15px; height:15px; border-radius:50%; border:1.6px solid var(--line2); flex:none}
.opt.ok{border-color:color-mix(in srgb,var(--green) 45%, transparent); background:var(--green-soft); color:var(--ink)}
.opt.ok i{border-color:var(--green); background:var(--green)}
.score{
  margin-top:12px; display:flex; align-items:center; justify-content:space-between;
  border-top:1px dashed var(--line); padding-top:13px; font-size:13px; color:var(--muted);
}
.score b{font-family:var(--mono); font-size:20px; color:var(--green); font-variant-numeric:tabular-nums}

.ojt{display:flex; flex-direction:column; gap:2px}
.ojt-row{display:flex; align-items:center; gap:11px; padding:9px 0; font-size:13px}
.ojt-row+.ojt-row{border-top:1px solid var(--line)}
.ojt-row span{flex:1; color:var(--ink2)}
.stars{display:flex; gap:2px; flex:none}
.stars svg{width:13px; height:13px; color:var(--line2)}
.stars svg.f{color:var(--clay)}
.tick{width:17px; height:17px; border-radius:5px; background:var(--green); display:grid; place-items:center; flex:none}
.tick svg{width:11px; height:11px; color:#fff}

/* ============ COURSES ============ */
.cat-row{display:flex; flex-wrap:wrap; gap:8px; margin-bottom:26px}
.cat{font-size:13px; font-weight:600; padding:7px 14px; border-radius:20px; border:1px solid var(--line); background:var(--card); color:var(--ink2)}
.cat b{font-family:var(--mono); font-size:11px; color:var(--muted); margin-left:5px; font-weight:600}
.courses{display:grid; grid-template-columns:repeat(4,1fr); gap:1px; background:var(--line); border:1px solid var(--line); border-radius:var(--r); overflow:hidden}
.course{background:var(--card); padding:16px 17px; display:flex; flex-direction:column; gap:6px}
.course-n{font-size:14px; font-weight:600; letter-spacing:-.015em; line-height:1.3}
.course-m{display:flex; align-items:center; gap:8px; font-family:var(--mono); font-size:10.5px; color:var(--muted); margin-top:auto; padding-top:6px}
.lv{color:var(--blue); font-weight:600}

/* ============ AUDIENCE ============ */
.auds{display:grid; grid-template-columns:repeat(2,1fr); gap:20px}
.aud{background:var(--card); border:1px solid var(--line); border-radius:var(--r); padding:28px 28px 30px; display:flex; flex-direction:column}
.aud-top{display:flex; align-items:center; gap:12px; margin-bottom:16px}
.aud-top .ic{width:38px; height:38px; border-radius:10px; background:var(--blue-soft); color:var(--blue); display:grid; place-items:center; flex:none}
.aud-top .ic svg{width:19px; height:19px}
.aud-top h3{font-size:17.5px}
.aud-top em{font-style:normal; display:block; font-size:12px; color:var(--muted); font-weight:500; letter-spacing:0; margin-top:2px}
.qa{font-size:14.5px; color:var(--ink2); display:flex; flex-direction:column; gap:12px}
.qa div{display:flex; gap:12px}
.qa strong{
  font-family:var(--mono); font-size:10px; letter-spacing:.08em; text-transform:uppercase;
  color:var(--muted); width:62px; flex:none; padding-top:4px;
}
.qa .ans{color:var(--ink)}

/* ============ TABLE ============ */
.tbl-wrap{overflow-x:auto; border:1px solid var(--line); border-radius:var(--r); background:var(--card)}
table{width:100%; border-collapse:collapse; font-size:14.5px; min-width:620px}
th,td{text-align:left; padding:14px 20px; border-bottom:1px solid var(--line); vertical-align:top}
th{font-family:var(--mono); font-size:11px; letter-spacing:.09em; text-transform:uppercase; color:var(--muted); font-weight:600; background:var(--wash)}
tr:last-child td{border-bottom:none}
td:first-child{font-weight:600; white-space:nowrap}
td.d{color:var(--ink2)}

/* ============ TECH ============ */
.techs{display:grid; grid-template-columns:repeat(4,1fr); gap:18px}
.tech{background:var(--card); border:1px solid var(--line); border-radius:12px; padding:22px}
.tech .k{font-family:var(--mono); font-size:10.5px; letter-spacing:.1em; text-transform:uppercase; color:var(--muted)}
.tech h4{font-size:15.5px; margin:10px 0 7px}
.tech p{font-size:13.5px; color:var(--ink2); line-height:1.55}

/* ============ ROADMAP ============ */
.road{display:grid; grid-template-columns:repeat(2,1fr); gap:20px}
.road-col{background:var(--card); border:1px solid var(--line); border-radius:var(--r); padding:26px 28px 28px}
.road-col h3{font-size:16.5px; display:flex; align-items:center; gap:9px; margin-bottom:16px}
.road-col ul{margin:0; padding:0; list-style:none; display:flex; flex-direction:column; gap:10px}
.road-col li{font-size:14px; color:var(--ink2); display:flex; gap:10px}
.road-col li::before{content:"—"; color:var(--muted); flex:none}
.badge{font-family:var(--mono); font-size:10px; letter-spacing:.08em; padding:3px 9px; border-radius:20px; text-transform:uppercase; font-weight:600}
.badge.live{background:var(--green-soft); color:var(--green)}
.badge.soon{background:var(--clay-soft); color:var(--clay)}

/* ============ CTA ============ */
.cta{
  border-radius:20px; padding:64px 56px; text-align:center; position:relative; overflow:hidden;
  background:linear-gradient(155deg, var(--blue-d) 0%, var(--blue) 58%, color-mix(in srgb,var(--blue) 76%, var(--clay)) 100%);
  color:#fff;
}
.cta h2{font-size:clamp(26px,3.4vw,38px); color:#fff; margin-bottom:16px}
.cta p{color:rgba(255,255,255,.88); max-width:560px; margin:0 auto; font-size:16.5px}
.cta-btns{display:flex; gap:12px; justify-content:center; flex-wrap:wrap; margin-top:32px}
.cta .btn-primary{background:#fff; color:var(--blue-d); box-shadow:0 8px 24px -8px rgba(0,0,0,.4)}
.cta .btn-ghost{background:transparent; border-color:rgba(255,255,255,.42); color:#fff}
.cta .btn-ghost:hover{border-color:#fff; color:#fff; background:rgba(255,255,255,.1)}

/* ============ FOOTER ============ */
footer{border-top:1px solid var(--line); padding:44px 0; background:var(--wash)}
.foot{display:flex; justify-content:space-between; align-items:center; gap:24px; flex-wrap:wrap; font-size:13.5px; color:var(--muted)}
.foot a{color:var(--ink2)}
.foot-links{display:flex; gap:22px; flex-wrap:wrap}

/* ============ RESPONSIVE ============ */
@media (max-width:1000px){
  .hero-grid,.dive{grid-template-columns:1fr; gap:40px}
  .dive.rev .dive-copy{order:0}
  .mods,.techs{grid-template-columns:repeat(2,1fr)}
  .courses{grid-template-columns:repeat(3,1fr)}
  .nav-links{display:none}
}
@media (max-width:720px){
  .band{padding:68px 0}
  .problems,.auds,.road,.mods,.techs{grid-template-columns:1fr}
  .courses{grid-template-columns:repeat(2,1fr)}
  .stats{grid-template-columns:repeat(2,1fr); gap:4px 0}
  .cta{padding:48px 26px}
  .app{grid-template-columns:1fr}
  .app-side{display:none}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none !important; transition:none !important}
}

/* ============ FORM ĐĂNG KÝ ============ */
.signup{display:grid; grid-template-columns:minmax(0,.85fr) minmax(0,1.15fr); gap:52px; align-items:start}
.signup-copy h2{font-size:clamp(26px,3.2vw,36px); margin:14px 0 16px}
.signup-copy p{color:var(--ink2)}
.signup-facts{list-style:none; margin:26px 0 0; padding:0; display:flex; flex-direction:column; gap:14px}
.signup-facts li{display:flex; gap:12px; font-size:14.5px; color:var(--ink2)}
.signup-facts b{display:block; color:var(--ink); font-weight:600; margin-bottom:2px}
.signup-facts .num{
  font-family:var(--mono); font-size:11px; font-weight:600; color:var(--blue);
  background:var(--blue-soft); border-radius:6px; width:26px; height:24px;
  display:grid; place-items:center; flex:none; margin-top:2px;
}
.form{
  background:var(--card); border:1px solid var(--line); border-radius:var(--r);
  padding:30px 30px 32px; box-shadow:var(--shadow); display:flex; flex-direction:column; gap:16px;
}
.form-row{display:grid; grid-template-columns:1fr 1fr; gap:16px}
.field{display:flex; flex-direction:column; gap:7px}
.field label{font-size:13px; font-weight:600; color:var(--ink)}
.field input,.field select,.field textarea{
  font-family:inherit; font-size:14.5px; color:var(--ink); background:var(--paper);
  border:1px solid var(--line2); border-radius:9px; padding:11px 13px; width:100%;
}
.field textarea{resize:vertical; min-height:82px}
.field input:focus,.field select:focus,.field textarea:focus{
  outline:none; border-color:var(--blue); box-shadow:0 0 0 3px var(--blue-soft);
}
.form button[type=submit]{
  font-family:inherit; font-size:15px; font-weight:600; cursor:pointer;
  background:var(--blue); color:#fff; border:none; border-radius:10px; padding:13px 22px;
  box-shadow:0 6px 18px -6px rgba(47,107,255,.6); transition:transform .16s ease;
}
.form button[type=submit]:hover:not(:disabled){transform:translateY(-1px)}
.form button[type=submit]:disabled{opacity:.6; cursor:default}
.consent{font-size:12.5px; color:var(--muted); line-height:1.5}
.consent a{color:var(--ink2); text-decoration:underline}

/* ============ NÚT ZALO ============ */
.zalo{
  position:fixed; right:20px; bottom:20px; z-index:90;
  display:flex; align-items:center; gap:9px; padding:11px 17px 11px 14px;
  background:#0068FF; color:#fff; border-radius:30px; font-size:14px; font-weight:600;
  box-shadow:0 8px 24px -6px rgba(0,104,255,.5);
}
.zalo:hover{color:#fff; transform:translateY(-1px)}
.zalo svg{width:19px; height:19px}

/* ============ TRANG PHỤ ============ */
.doc{max-width:760px; margin:0 auto}
.doc h2{font-size:24px; margin:36px 0 12px}
.doc h2:first-child{margin-top:0}
.doc p,.doc li{color:var(--ink2); font-size:15.5px}
.doc ul{padding-left:20px; display:flex; flex-direction:column; gap:8px; margin:12px 0}

@media (max-width:1000px){
  .signup{grid-template-columns:1fr; gap:36px}
}
@media (max-width:720px){
  .form-row{grid-template-columns:1fr}
  .zalo{right:14px; bottom:14px; padding:10px 15px 10px 12px; font-size:13px}
}

/* ============ THANH ĐIỀU HƯỚNG TRÊN MÀN HÌNH NHỎ ============ */
.nav-cta .n{display:none}
@media (max-width:720px){
  .nav-in{height:56px; gap:12px}
  .brand{font-size:15px; white-space:nowrap}
  .brand small{display:none}
  .brand svg{width:23px; height:23px}
  .nav-cta{margin-left:auto; padding:8px 15px; font-size:13.5px; white-space:nowrap}
  .nav-cta .w{display:none}
  .nav-cta .n{display:inline}
}