:root{
  --navy:#0A2540;
  --navy-deep:#061A30;
  --navy-soft:#13355a;
  --gold:#C9A24B;
  --gold-soft:#d8b86c;
  --ink:#1D1D1F;
  --ink-2:#6E6E73;
  --line:#D2D2D7;
  --grey:#F5F5F7;
  --white:#FFFFFF;
  --radius:16px;
  --ease:cubic-bezier(.22,.61,.36,1);
  --maxw:720px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:-apple-system,BlinkMacSystemFont,"SF Pro Display","SF Pro Text","Inter","Open Sans","Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  color:var(--ink);
  background:var(--white);
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  line-height:1.5;
  letter-spacing:-.01em;
}
.wordmark{font-family:"Prosto One",-apple-system,sans-serif;font-weight:400;letter-spacing:.34em}
.eyebrow{font-size:.72rem;letter-spacing:.34em;text-transform:uppercase;color:var(--gold);font-weight:600}

/* ---------- progress + header ---------- */
#bar{position:fixed;top:0;left:0;height:3px;width:0;background:var(--navy);z-index:60;transition:width .35s var(--ease)}
header{
  position:fixed;top:0;left:0;right:0;z-index:50;
  display:flex;align-items:center;justify-content:space-between;
  padding:14px clamp(20px,5vw,48px);
  background:rgba(255,255,255,.72);
  backdrop-filter:saturate(180%) blur(20px);
  -webkit-backdrop-filter:saturate(180%) blur(20px);
  border-bottom:1px solid rgba(0,0,0,.06);
  transform:translateY(-100%);transition:transform .5s var(--ease);
}
header.show{transform:translateY(0)}
header .wordmark{font-size:1.05rem;color:var(--navy)}
header .count{font-size:.82rem;color:var(--ink-2);letter-spacing:0}
header .count b{color:var(--navy);font-weight:600}

/* ---------- hero ---------- */
.hero{
  min-height:100svh;display:flex;flex-direction:column;align-items:center;justify-content:center;
  text-align:center;padding:120px clamp(20px,5vw,40px) 80px;
  background:radial-gradient(120% 90% at 50% 0%,#ffffff 0%,#ffffff 45%,#f3f4f7 100%);
  position:relative;
}
.hero-banner-wrap{
  width:100%;max-width:840px;
  border-radius:20px;overflow:hidden;
  box-shadow:0 24px 64px -20px rgba(10,37,64,.2);
  margin-bottom:28px;
}
.hero-banner{width:100%;display:block}
.hero .meta{margin-top:0;font-size:.88rem;color:var(--ink-2);letter-spacing:0}
.hero .meta span{display:inline-flex;align-items:center;gap:7px}
.hero .meta .dot{width:4px;height:4px;border-radius:50%;background:var(--line);margin:0 14px;display:inline-block;vertical-align:middle}
.cta{
  display:inline-flex;align-items:center;gap:10px;margin-top:40px;
  background:var(--navy);color:#fff;border:none;cursor:pointer;
  font-size:1.02rem;font-weight:500;letter-spacing:0;
  padding:15px 34px;border-radius:980px;
  transition:transform .35s var(--ease),background .35s var(--ease),box-shadow .35s var(--ease);
  box-shadow:0 8px 30px -12px rgba(10,37,64,.55);
}
.cta:hover{background:var(--navy-soft);transform:translateY(-2px);box-shadow:0 14px 36px -12px rgba(10,37,64,.6)}
.cta:active{transform:translateY(0)}
.cta svg{width:16px;height:16px}
.scrollcue{position:absolute;bottom:30px;left:50%;transform:translateX(-50%);color:var(--line);animation:bob 2.4s var(--ease) infinite}
@keyframes bob{0%,100%{transform:translateX(-50%) translateY(0)}50%{transform:translateX(-50%) translateY(8px)}}

/* ---------- questions ---------- */
main{position:relative}
.q-section{padding:clamp(64px,11vw,128px) clamp(20px,5vw,40px)}
.q-section:nth-child(even){background:var(--grey)}
.q-inner{
  max-width:var(--maxw);margin:0 auto;
  opacity:0;transform:translateY(28px);transition:opacity .7s var(--ease),transform .7s var(--ease)
}
.q-inner.in{opacity:1;transform:none}
.q-head{display:flex;align-items:center;gap:14px;margin-bottom:18px}
.q-num{
  font-family:"Prosto One",sans-serif;font-size:.95rem;color:var(--navy);letter-spacing:.15em;
  border:1px solid var(--navy);border-radius:980px;padding:3px 13px
}
.q-req{font-size:.72rem;letter-spacing:.14em;text-transform:uppercase;color:var(--gold);font-weight:600}
.q-title{font-size:clamp(1.5rem,3.6vw,2.3rem);font-weight:600;line-height:1.18;letter-spacing:-.02em;color:var(--ink);margin-bottom:30px}
.q-title strong{color:var(--navy);font-weight:700}
.options{display:flex;flex-direction:column;gap:12px}
.option{
  position:relative;display:flex;align-items:center;gap:16px;cursor:pointer;
  padding:18px 22px;border:1px solid var(--line);border-radius:var(--radius);
  background:var(--white);
  transition:border-color .25s var(--ease),background .25s var(--ease),transform .15s var(--ease),box-shadow .25s var(--ease);
  user-select:none;
}
.q-section:nth-child(even) .option:not(.is-checked):not(:has(input:checked)){background:#fff}
.option:hover{border-color:var(--navy);box-shadow:0 6px 22px -14px rgba(10,37,64,.5)}
.option:active{transform:scale(.992)}
.option input{position:absolute;opacity:0;width:0;height:0}
.radio{
  flex:0 0 auto;width:22px;height:22px;border-radius:50%;border:1.5px solid var(--line);
  display:grid;place-items:center;transition:border-color .25s var(--ease),background .25s var(--ease)
}
.radio::after{content:"";width:9px;height:9px;border-radius:50%;background:#fff;transform:scale(0);transition:transform .25s var(--ease)}
.opt-text{font-size:clamp(1rem,2.3vw,1.15rem);color:var(--ink);letter-spacing:0;line-height:1.4}
.option:has(input:checked),.option.is-checked{background:var(--navy);border-color:var(--navy);box-shadow:0 10px 30px -14px rgba(10,37,64,.7)}
.option:has(input:checked) .opt-text,.option.is-checked .opt-text{color:#fff;font-weight:500}
.option:has(input:checked) .radio,.option.is-checked .radio{border-color:#fff;background:#fff}
.option:has(input:checked) .radio::after,.option.is-checked .radio::after{transform:scale(1);background:var(--navy)}
.option input:focus-visible + .radio{outline:2px solid var(--gold);outline-offset:3px}
.q-error{margin-top:14px;color:#c0392b;font-size:.9rem;letter-spacing:0;opacity:0;height:0;overflow:hidden;transition:opacity .3s var(--ease)}
.q-inner.err .q-error{opacity:1;height:auto}
.q-inner.err .options{animation:shake .4s var(--ease)}
@keyframes shake{10%,90%{transform:translateX(-1px)}20%,80%{transform:translateX(2px)}30%,50%,70%{transform:translateX(-4px)}40%,60%{transform:translateX(4px)}}

/* ---------- submit ---------- */
.finish{
  background:linear-gradient(170deg,var(--navy) 0%,var(--navy-deep) 100%);
  color:#fff;text-align:center;
  padding:clamp(72px,12vw,120px) clamp(20px,5vw,40px);
  position:relative;overflow:hidden;
}
.finish::before{
  content:"";position:absolute;top:0;left:0;right:0;height:2px;
  background:linear-gradient(90deg,transparent 0%,var(--gold) 40%,var(--gold) 60%,transparent 100%);
  opacity:.6;
}
.finish::after{
  content:"";position:absolute;
  bottom:-120px;right:-80px;
  width:320px;height:320px;border-radius:50%;
  background:radial-gradient(circle,rgba(201,162,75,.07) 0%,transparent 70%);
  pointer-events:none;
}
.finish .eyebrow{display:block;margin-bottom:18px}
.finish .wordmark{color:#fff;font-size:1.35rem;display:block;margin-bottom:22px;opacity:.85}
.finish h2{
  font-size:clamp(2rem,5vw,3.2rem);font-weight:600;
  letter-spacing:-.025em;line-height:1.1;margin:0 auto;
}
.finish .answered{
  margin-top:18px;font-size:.9rem;
  color:rgba(255,255,255,.5);letter-spacing:.05em;
}
.finish .answered b{color:var(--gold-soft);font-weight:700;font-size:1rem}
.submit{
  margin-top:34px;background:var(--gold);color:var(--navy);border:none;cursor:pointer;
  font-size:1.05rem;font-weight:700;letter-spacing:.01em;
  padding:16px 52px;border-radius:980px;
  transition:transform .35s var(--ease),box-shadow .35s var(--ease),background .35s var(--ease);
  box-shadow:0 10px 32px -10px rgba(201,162,75,.5);
}
.submit:hover{transform:translateY(-2px);background:var(--gold-soft);box-shadow:0 16px 40px -12px rgba(201,162,75,.6)}
.submit:active{transform:translateY(0)}
.finish-note{
  margin-top:20px;font-size:.82rem;
  color:rgba(255,255,255,.3);letter-spacing:.01em;
  font-style:italic;
}

/* ---------- footer ---------- */
footer{background:var(--navy-deep);color:rgba(255,255,255,.6);text-align:center;padding:54px 24px;font-size:.82rem;letter-spacing:0}
footer .wordmark{color:#fff;font-size:1.1rem;display:block;margin-bottom:14px;opacity:.95}
footer .ft-tag{color:var(--gold-soft);letter-spacing:.28em;font-size:.68rem;text-transform:uppercase;margin-bottom:18px}
footer a{color:rgba(255,255,255,.8);text-decoration:none}
footer a:hover{color:#fff}
footer .addr{margin-top:6px;line-height:1.7}

/* ---------- thank you ---------- */
.thanks{
  position:fixed;inset:0;z-index:100;
  background:#EDEEF1;
  display:flex;align-items:flex-start;justify-content:center;
  overflow-y:auto;
  opacity:0;visibility:hidden;transition:opacity .6s var(--ease),visibility .6s
}
.thanks.show{opacity:1;visibility:visible}
.thanks-inner{
  display:flex;flex-direction:column;align-items:center;text-align:center;
  padding:44px 20px 44px;width:100%;max-width:420px;
}
.check{
  width:60px;height:60px;border-radius:50%;border:1.5px solid var(--navy);
  display:grid;place-items:center;margin-bottom:16px;
  transform:scale(.6);opacity:0;transition:transform .6s var(--ease) .15s,opacity .6s ease .15s
}
.thanks.show .check{transform:scale(1);opacity:1}
.check svg{width:30px;height:30px}
.check path{
  stroke:var(--navy);stroke-width:3.5;fill:none;stroke-linecap:round;stroke-linejoin:round;
  stroke-dasharray:60;stroke-dashoffset:60;transition:stroke-dashoffset .6s var(--ease) .55s
}
.thanks.show .check path{stroke-dashoffset:0}
.thanks .wordmark{color:var(--navy);font-size:1.05rem;margin-bottom:14px;letter-spacing:.34em}
.thanks h2{font-size:clamp(1.7rem,4.5vw,2.4rem);font-weight:600;letter-spacing:-.025em;color:var(--navy)}
.thanks-desc{margin:10px auto 0;color:var(--ink-2);font-size:.95rem;line-height:1.6;letter-spacing:0}
.thanks-desc strong{color:var(--navy);font-weight:700}

/* ---------- voucher preview ---------- */
.voucher-preview{
  width:100%;max-width:320px;border-radius:14px;
  display:block;margin:22px auto 0;
  box-shadow:0 16px 48px -16px rgba(10,37,64,.22);
}

/* ---------- voucher steps ---------- */
.voucher-steps{
  display:flex;align-items:flex-start;justify-content:center;
  gap:8px;margin-top:22px;width:100%;
  background:#fff;border-radius:16px;padding:18px 14px;
  box-shadow:0 4px 20px -8px rgba(10,37,64,.12);
}
.vstep{
  display:flex;flex-direction:column;align-items:center;
  gap:7px;flex:1;text-align:center;
}
.vstep-num{
  width:30px;height:30px;border-radius:50%;
  background:var(--navy);color:#fff;
  font-size:.8rem;font-weight:700;
  display:grid;place-items:center;flex-shrink:0;
}
.vstep-text{font-size:.74rem;color:var(--ink-2);line-height:1.45;letter-spacing:.01em}
.vstep-text strong{color:var(--navy);font-weight:700}
.vstep-arrow{
  font-size:1rem;color:var(--gold);
  padding-top:6px;flex-shrink:0;
}

/* ---------- QR card ---------- */
.qr-card{
  width:100%;background:#fff;border-radius:18px;
  padding:20px 16px;margin-top:18px;
  box-shadow:0 8px 32px -12px rgba(10,37,64,.18);
  display:flex;flex-direction:column;align-items:center;gap:12px;
}
.qr-label{
  font-size:.78rem;font-weight:600;letter-spacing:.1em;
  text-transform:uppercase;color:var(--ink-2);margin:0;
}
.zalo-qr{
  width:220px;height:auto;display:block;
  border-radius:10px;object-fit:contain;
}

/* ---------- zalo CTA ---------- */
.btn-zalo{
  display:flex;align-items:center;justify-content:center;gap:10px;
  background:#0068FF;color:#fff;text-decoration:none;
  font-size:.95rem;font-weight:700;padding:14px 20px;
  border-radius:14px;width:100%;margin-top:14px;
  transition:background .25s var(--ease),transform .2s var(--ease),box-shadow .25s var(--ease);
  box-shadow:0 8px 28px -8px rgba(0,104,255,.45);
  letter-spacing:.01em;
}
.btn-zalo:hover{background:#0057D9;transform:translateY(-2px);box-shadow:0 14px 32px -8px rgba(0,104,255,.5)}
.btn-zalo:active{transform:translateY(0)}
.zalo-icon{
  font-size:1rem;font-weight:900;font-style:italic;
  background:#fff;color:#0068FF;
  width:26px;height:26px;border-radius:6px;
  display:grid;place-items:center;flex-shrink:0;
}
.thanks-hint{
  margin-top:14px;font-size:.78rem;
  color:var(--ink-2);text-align:center;line-height:1.6;
}

/* ---------- voucher card ---------- */
.voucher{
  margin-top:22px;width:100%;border-radius:20px;overflow:hidden;
  box-shadow:0 24px 60px -20px rgba(10,37,64,.28);
}
.voucher-banner{
  width:100%;display:block;
  max-height:168px;object-fit:cover;object-position:center;
}
.voucher-body{
  background:var(--navy-deep);
  padding:0 22px 22px;text-align:center;
  position:relative;
}
.voucher-body::before{
  content:"";display:block;height:14px;
  margin:0 -22px 18px;
  background-image:radial-gradient(circle,#EDEEF1 7px,transparent 7px);
  background-size:22px 14px;
  background-position:11px -7px;
}
.voucher-label{
  font-size:.65rem;letter-spacing:.22em;text-transform:uppercase;
  color:var(--gold-soft);font-weight:600;margin-bottom:6px;
}
.voucher-big{
  font-size:3.6rem;font-weight:800;color:var(--gold);
  letter-spacing:-.02em;line-height:1;
}
.voucher-sub{
  font-size:.78rem;color:rgba(255,255,255,.45);margin:4px 0 18px;
  letter-spacing:.01em;
}
.btn-claim{
  display:flex;align-items:center;justify-content:center;gap:8px;
  background:var(--gold);color:var(--navy);text-decoration:none;
  font-size:1rem;font-weight:700;padding:14px 20px;border-radius:12px;
  width:100%;
  transition:background .25s var(--ease),transform .2s var(--ease),box-shadow .25s var(--ease);
  box-shadow:0 8px 24px -8px rgba(201,162,75,.6);
  letter-spacing:.01em;
}
.btn-claim:hover{background:var(--gold-soft);transform:translateY(-2px);box-shadow:0 14px 28px -8px rgba(201,162,75,.55)}
.btn-claim:active{transform:translateY(0)}
.voucher-qr-row{
  display:flex;align-items:center;gap:14px;
  margin-top:16px;padding-top:16px;
  border-top:1px solid rgba(255,255,255,.1);
  text-align:left;
}
.voucher-qr{
  width:82px;height:82px;flex-shrink:0;
  border-radius:8px;background:#fff;padding:5px;display:block;
}
.voucher-qr-text{flex:1}
.voucher-qr-text strong{
  display:block;font-size:.85rem;color:rgba(255,255,255,.85);
  font-weight:600;margin-bottom:4px;
}
.voucher-qr-text p{
  font-size:.76rem;color:rgba(255,255,255,.45);line-height:1.5;
}
.voucher-qr-text span{
  display:inline-block;margin-top:5px;
  font-size:.68rem;letter-spacing:.1em;text-transform:uppercase;
  color:var(--gold-soft);font-weight:600;
}

/* ---------- voucher ---------- */
.voucher{
  margin-top:32px;width:100%;max-width:380px;
  background:var(--navy-deep);border-radius:var(--radius);
  padding:28px 28px 22px;text-align:left;position:relative;overflow:hidden;
}
.voucher::after{
  content:"";position:absolute;bottom:-40px;right:-30px;
  width:120px;height:120px;border-radius:50%;
  background:rgba(201,162,75,.08);pointer-events:none;
}
.voucher-label{
  font-size:.68rem;letter-spacing:.22em;text-transform:uppercase;
  color:var(--gold-soft);font-weight:600;margin-bottom:10px;
}
.voucher-discount{
  font-size:2.8rem;font-weight:700;color:#fff;
  letter-spacing:-.02em;line-height:1;margin-bottom:20px;
}
.voucher-row{
  display:flex;align-items:center;gap:10px;
  background:rgba(255,255,255,.08);
  border:1.5px dashed rgba(255,255,255,.2);
  border-radius:10px;padding:11px 14px;margin-bottom:14px;
}
.voucher-code{
  font-family:"SF Mono",SFMono-Regular,ui-monospace,Menlo,monospace;
  font-size:1.25rem;font-weight:700;color:#fff;letter-spacing:.18em;flex:1;
}
.btn-copy{
  background:var(--gold);border:none;color:var(--navy);
  font-size:.8rem;font-weight:700;padding:7px 15px;
  border-radius:8px;cursor:pointer;letter-spacing:.04em;
  transition:background .2s var(--ease),transform .15s var(--ease);
  white-space:nowrap;flex-shrink:0;
}
.btn-copy:hover{background:var(--gold-soft)}
.btn-copy:active{transform:scale(.95)}
.btn-copy.copied{background:#27ae60;color:#fff}
.voucher-hint{font-size:.76rem;color:rgba(255,255,255,.45);line-height:1.55}
.voucher-hint a{color:rgba(255,255,255,.65);text-decoration:none}
.voucher-hint a:hover{color:#fff}

@media (max-width:560px){
  .hero .meta .dot{margin:0 9px}
  .option{padding:16px 18px;gap:13px}
  header .count{display:none}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important;scroll-behavior:auto!important}
  .q-inner{opacity:1;transform:none}
}