/* Standalone page: shares Grading Desk tokens. No build step. */
:root{--ink:#20282b;--muted:#536068;--paper:#f2f4f5;--surface:#fff;--line:#c7ced1;--accent:#3156a6;--accent-hover:#24468f;--ah-font:"Source Sans 3",system-ui,sans-serif}

:root{
  --bg:#080d1e;
  --bg-2:#0c132b;
  --white:#fff;
  --text:#f7f8ff;
  --muted:#9fa9c6;
  --line:rgba(255,255,255,.11);
  --blue:#4f7cff;
  --blue-2:#6d5cff;
  --cyan:#31dfff;
  --green:#22c98b;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  background:var(--bg);
  color:var(--text);
  font-family:"Source Sans 3",sans-serif;
  overflow-x:hidden;
}
a{color:inherit;text-decoration:none}
button{font:inherit}
img{display:block;max-width:100%}
.container{width:min(calc(100% - 32px),1180px);margin:auto}
h1,h2,h3{font-family:"Lexend",sans-serif}
.reveal{opacity:0;transform:translateY(24px);transition:.8s ease}
.reveal.in{opacity:1;transform:none}

/* NAV */
.navbar{
  position:fixed;
  top:18px;left:50%;
  transform:translateX(-50%);
  z-index:100;
  width:min(calc(100% - 28px),1080px);
  padding:9px 11px 9px 18px;
  border:1px solid rgba(255,255,255,.12);
  border-radius:999px;
  background:rgba(6,10,24,.52);
  backdrop-filter:blur(18px);
  transition:.3s ease;
}
.navbar.scrolled{top:10px;background:rgba(6,10,24,.9)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;gap:20px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800}
.brand-mark{
  width:42px;height:42px;display:grid;place-items:center;overflow:hidden;
  flex:0 0 42px;border-radius:13px;
  background:rgba(255,255,255,.06);
  border:1px solid rgba(255,255,255,.12);
  box-shadow:0 12px 28px rgba(40,70,180,.28);
}
.brand-mark img{
  width:100%;height:100%;object-fit:contain;
  padding:4px;border-radius:11px
}
.brand-fallback{
  display:none;width:100%;height:100%;place-items:center;
  border-radius:11px;background:linear-gradient(135deg,var(--blue),var(--blue-2));
  color:#fff;font-family:"Lexend",sans-serif;font-weight:800
}
.brand-copy{display:flex;flex-direction:column;line-height:1}
.brand-copy small{margin-top:5px;color:#aeb8d3;font-size:9px;letter-spacing:.12em;text-transform:uppercase}
.nav-links{display:flex;align-items:center;gap:26px}
.nav-link{position:relative;color:#cad1e6;font-size:13px;font-weight:600}
.nav-link:after{
  content:"";position:absolute;left:0;right:0;bottom:-7px;height:2px;
  background:linear-gradient(90deg,var(--cyan),var(--blue-2));
  transform:scaleX(0);transition:.25s ease
}
.nav-link:hover:after{transform:scaleX(1)}
.nav-actions{display:flex;align-items:center;gap:9px}
.btn{
  min-height:42px;padding:0 18px;border:1px solid transparent;border-radius:999px;
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  font-size:13px;font-weight:700;cursor:pointer;transition:.25s ease
}
.btn:hover{transform:translateY(-2px)}
.btn-primary{
  background:linear-gradient(135deg,var(--blue),var(--blue-2));
  box-shadow:0 12px 28px rgba(79,124,255,.28)
}
.btn-outline{border-color:rgba(255,255,255,.16);background:rgba(255,255,255,.04)}
.mobile-btn{
  display:none;width:42px;height:42px;border:1px solid var(--line);
  border-radius:50%;color:#fff;background:rgba(255,255,255,.04)
}

/* HERO: 2 ảnh nền + hiệu ứng vòng tròn khi cuộn */
.hero-wrap{height:280vh;position:relative}
.hero-sticky{position:sticky;top:0;height:100vh;overflow:hidden;background:#050814}
.hero-layer{position:absolute;inset:0}
.hero-layer img{width:100%;height:100%;object-fit:cover}
.hero-layer:after{content:"";position:absolute;inset:0}
.hero-first:after{
  background:
    linear-gradient(90deg,rgba(3,7,18,.94) 0%,rgba(3,7,18,.74) 33%,rgba(3,7,18,.18) 69%,rgba(3,7,18,.42) 100%),
    linear-gradient(180deg,rgba(3,7,18,.15),rgba(3,7,18,.82))
}
.hero-second{
  clip-path:circle(0% at 68% 52%);
  will-change:clip-path,transform;
}
.hero-second:after{
  background:
    linear-gradient(90deg,rgba(3,7,18,.94) 0%,rgba(3,7,18,.73) 34%,rgba(3,7,18,.12) 70%,rgba(3,7,18,.44) 100%),
    linear-gradient(180deg,rgba(3,7,18,.12),rgba(3,7,18,.78))
}
.hero-content{
  position:absolute;inset:0;z-index:5;
  display:flex;align-items:flex-start;
  padding-top:clamp(122px,16vh,154px);
  padding-bottom:42px;
  pointer-events:none
}
.hero-copy{width:min(600px,100%);pointer-events:auto}
.hero-badge{
  display:inline-flex;align-items:center;gap:8px;
  margin-bottom:20px;padding:8px 13px;border:1px solid rgba(96,124,255,.25);
  border-radius:999px;background:rgba(79,124,255,.09);
  color:#d6dcff;font-size:11px;font-weight:700;letter-spacing:.1em;text-transform:uppercase
}
.hero-badge i{width:8px;height:8px;border-radius:50%;background:var(--green);box-shadow:0 0 12px var(--green)}
.hero-title{
  max-width:720px;
  font-family:"Lexend",sans-serif;
  font-size:clamp(2.7rem,5.15vw,4.8rem);
  font-weight:800;
  letter-spacing:-.045em;
  line-height:1.06
}
.hero-title .title-line{display:block}
.hero-title .title-white{color:#f7f8ff}
.hero-title .title-gradient{
  color:transparent;
  background:linear-gradient(90deg,#5cdfff,#6887ff,#a66eff);
  -webkit-background-clip:text;background-clip:text
}
.hero-desc{max-width:570px;margin-top:22px;color:#b4bfd9;font-size:16px;line-height:1.8}
.hero-buttons{display:flex;flex-wrap:wrap;gap:12px;margin-top:30px}
.hero-buttons .btn{min-height:50px;padding-inline:23px}
.hero-stage{
  display:inline-flex;align-items:center;gap:8px;margin-top:30px;
  color:#a9b5d1;font-size:12px
}
.hero-stage span{width:38px;height:2px;background:rgba(255,255,255,.22)}
.scroll-indicator{
  position:absolute;z-index:8;left:50%;bottom:24px;
  transform:translateX(-50%);
  color:#aeb9d4;animation:bounce 1.8s infinite
}
@keyframes bounce{0%,100%{transform:translate(-50%,0)}50%{transform:translate(-50%,10px)}}

/* TICKER */
.ticker-section{padding:70px 0;background:var(--bg)}
.ticker-head{text-align:center;margin-bottom:30px}
.ticker-head span{color:#8398ff;font-size:11px;font-weight:800;letter-spacing:.15em;text-transform:uppercase}
.ticker-head h2{margin-top:9px;font-size:clamp(1.6rem,3vw,2.2rem)}
.ticker-mask{position:relative;overflow:hidden}
.ticker-mask:before,.ticker-mask:after{
  content:"";position:absolute;z-index:2;top:0;bottom:0;width:120px
}
.ticker-mask:before{left:0;background:linear-gradient(90deg,var(--bg),transparent)}
.ticker-mask:after{right:0;background:linear-gradient(-90deg,var(--bg),transparent)}
.ticker-track{
  display:flex;gap:20px;width:max-content;padding:5px 10px;
  animation:ticker 30s linear infinite
}
@keyframes ticker{to{transform:translateX(-50%)}}
.ticker-item{
  min-width:210px;padding:15px 18px;border:1px solid var(--line);border-radius:18px;
  display:flex;align-items:center;gap:12px;background:rgba(255,255,255,.035)
}
.ticker-icon{
  width:39px;height:39px;display:grid;place-items:center;border-radius:12px;
  color:#a8b7ff;background:rgba(79,124,255,.12)
}
.ticker-item strong{display:block;font-size:13px}
.ticker-item small{display:block;margin-top:4px;color:var(--muted);font-size:10px}

/* SECTIONS */
.section{padding:100px 0}
.section-head{max-width:720px;margin-bottom:42px}
.eyebrow{color:#8799ff;font-size:11px;font-weight:800;letter-spacing:.15em;text-transform:uppercase}
.section-head h2{margin-top:12px;font-size:clamp(2.25rem,5vw,4.2rem);line-height:1;letter-spacing:-.05em}
.section-head p{margin-top:18px;color:var(--muted);line-height:1.8}
.features-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.feature-card{
  min-height:245px;padding:30px;border:1px solid var(--line);border-radius:25px;
  background:rgba(255,255,255,.035);transition:.3s ease
}
.feature-card:hover{transform:translateY(-7px);border-color:rgba(118,139,255,.42);background:rgba(255,255,255,.055)}
.feature-icon{
  width:49px;height:49px;display:grid;place-items:center;margin-bottom:55px;
  border-radius:15px;color:#a9b7ff;background:rgba(79,124,255,.12)
}
.feature-card h3{font-size:1.3rem}
.feature-card p{margin-top:10px;color:var(--muted);font-size:13px;line-height:1.75}

/* IMAGE STORY */
.story{padding:40px 0 105px}
.story-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:24px}
.story-image{
  position:relative;min-height:530px;overflow:hidden;border:1px solid var(--line);border-radius:28px
}
.story-image img{width:100%;height:100%;object-fit:cover}
.story-image:after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,transparent 42%,rgba(4,7,17,.9))}
.story-caption{position:absolute;z-index:2;left:28px;right:28px;bottom:26px}
.story-caption span{color:#7fe9ff;font-size:11px;font-weight:800;letter-spacing:.13em;text-transform:uppercase}
.story-caption h3{margin-top:8px;font-size:2rem}
.story-panel{
  padding:34px;border:1px solid var(--line);border-radius:28px;
  display:flex;flex-direction:column;justify-content:center;
  background:linear-gradient(150deg,rgba(79,124,255,.11),rgba(255,255,255,.025))
}
.story-panel h2{font-size:clamp(2rem,4vw,3.5rem);line-height:1;letter-spacing:-.05em}
.story-panel p{margin-top:18px;color:var(--muted);line-height:1.85}
.story-list{display:grid;gap:13px;margin-top:28px}
.story-list li{list-style:none;display:flex;align-items:center;gap:11px;color:#d5dcef;font-size:13px}
.story-list i{width:24px;height:24px;display:grid;place-items:center;border-radius:50%;background:rgba(34,201,139,.15);color:#50e5aa;font-style:normal}

/* CONTACT + CTA + FOOTER */
.contact-section{padding:92px 0 48px}
.contact-shell{
  display:grid;grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr);gap:54px;
  padding:52px;border:1px solid var(--line);border-radius:30px;
  background:linear-gradient(145deg,rgba(255,255,255,.035),rgba(79,124,255,.045));
  box-shadow:0 30px 80px rgba(0,0,0,.18)
}
.contact-copy .eyebrow{display:block;color:#8ea2ff;font-size:11px;font-weight:800;letter-spacing:.14em;text-transform:uppercase}
.contact-copy h2{margin-top:14px;font-size:clamp(2.35rem,4.6vw,4.2rem);line-height:1.03;letter-spacing:-.05em}
.contact-copy p{margin-top:20px;max-width:500px;color:var(--muted);line-height:1.8}
.contact-meta{display:grid;gap:12px;margin-top:30px}
.contact-meta a,.contact-meta span{display:flex;align-items:center;gap:11px;color:#dce2f5;font-size:13px}
.contact-meta i{width:36px;height:36px;display:grid;place-items:center;border-radius:11px;background:rgba(79,124,255,.12);color:#8ea5ff;font-style:normal}
.contact-form{display:grid;gap:16px}
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.form-field{display:grid;gap:8px}
.form-field label{color:#eef1ff;font-size:12px;font-weight:700}
.form-field input,.form-field textarea{
  width:100%;border:1px solid rgba(255,255,255,.14);border-radius:15px;outline:0;
  background:rgba(255,255,255,.045);color:#fff;font:inherit;font-size:13px;
  transition:border-color .2s ease,box-shadow .2s ease,background .2s ease
}
.form-field input{height:50px;padding:0 16px}
.form-field textarea{min-height:150px;padding:14px 16px;resize:vertical;line-height:1.65}
.form-field input::placeholder,.form-field textarea::placeholder{color:#7f89a7}
.form-field input:focus,.form-field textarea:focus{border-color:#708aff;box-shadow:0 0 0 3px rgba(79,124,255,.13);background:rgba(255,255,255,.06)}
.form-field .hint{color:#7f89a7;font-size:10px}
.contact-submit{justify-self:start;min-width:150px;border:0}
.contact-alert{padding:13px 15px;border-radius:14px;font-size:12px;line-height:1.55}
.contact-alert.success{border:1px solid rgba(34,201,139,.35);background:rgba(34,201,139,.1);color:#9ef0cf}
.contact-alert.error{border:1px solid rgba(255,101,118,.35);background:rgba(255,101,118,.09);color:#ffc0c8}
.contact-alert ul{padding-left:18px}
.hp-field{position:absolute;left:-9999px;width:1px;height:1px;opacity:0;pointer-events:none}
.cta{padding:40px 0 100px}
.cta-box{
  position:relative;overflow:hidden;padding:68px 30px;border:1px solid rgba(125,145,255,.22);
  border-radius:32px;text-align:center;
  background:radial-gradient(circle at 50% 0%,rgba(79,124,255,.24),transparent 48%),var(--bg-2)
}
.cta-box h2{font-size:clamp(2.3rem,5.5vw,4.7rem);line-height:.98;letter-spacing:-.055em}
.cta-box p{max-width:600px;margin:20px auto 30px;color:var(--muted);line-height:1.8}
footer{padding:36px 0;border-top:1px solid var(--line)}
.footer-inner{display:flex;align-items:center;justify-content:space-between;gap:20px;color:var(--muted);font-size:11px}
.footer-links{display:flex;gap:22px}

/* RESPONSIVE */
/* Desktop hẹp / PC 1366px có Windows scaling 125%: tránh navbar chồng hero. */
@media(max-width:1100px){
  .navbar{
    width:min(calc(100% - 22px),1040px);
    padding:8px 10px 8px 14px;
  }
  .nav-inner{gap:12px}
  .brand{gap:8px}
  .brand-mark{width:38px;height:38px;flex-basis:38px;border-radius:12px}
  .brand-copy{font-size:14px}
  .brand-copy small{font-size:8px;margin-top:4px}
  .nav-links{
    display:none;position:absolute;top:64px;left:0;right:0;
    flex-direction:column;align-items:stretch;gap:0;padding:12px;
    border:1px solid var(--line);border-radius:20px;background:rgba(6,10,24,.98);
    box-shadow:0 18px 50px rgba(0,0,0,.34)
  }
  .nav-links.open{display:flex}
  .nav-link{padding:13px 14px}
  .nav-link:after{display:none}
  .mobile-btn{display:grid;place-items:center}
  .nav-actions .btn-outline{display:none}
  .nav-actions .btn-primary{min-height:38px;padding-inline:14px;font-size:12px}
}

/* Màn hình desktop thấp như 1366x768: hero phải nằm dưới fixed navbar. */
@media(max-height:800px) and (min-width:851px){
  .hero-content{padding-top:112px;padding-bottom:28px}
  .hero-badge{margin-bottom:12px;padding:7px 11px;font-size:10px}
  .hero-title{font-size:clamp(2.45rem,4.45vw,4rem);line-height:1.03}
  .hero-desc{margin-top:14px;font-size:14px;line-height:1.65;max-width:540px}
  .hero-buttons{margin-top:18px}
  .hero-buttons .btn{min-height:44px;padding-inline:18px}
  .hero-stage{margin-top:18px}
  .scroll-indicator{bottom:12px}
}

@media(max-width:850px){
  .nav-links{
    display:none;position:absolute;top:72px;left:0;right:0;
    flex-direction:column;align-items:stretch;gap:0;padding:12px;
    border:1px solid var(--line);border-radius:20px;background:rgba(6,10,24,.97)
  }
  .nav-links.open{display:flex}
  .nav-link{padding:13px 14px}
  .mobile-btn{display:grid;place-items:center}
  .nav-actions .btn-outline{display:none}
  .features-grid,.story-grid,.contact-shell{grid-template-columns:1fr}
  .contact-shell{gap:36px;padding:34px}
  .story-image{min-height:420px}
}
@media(max-width:620px){
  .navbar{top:9px;width:calc(100% - 18px)}
  .hero-content{padding-top:104px;padding-bottom:34px}
  .brand-copy small{display:none}
  .hero-title{font-size:clamp(2.35rem,11.5vw,3.75rem);letter-spacing:-.035em;line-height:1.08}
  .hero-desc{font-size:14px}
  .hero-buttons{flex-direction:column}
  .hero-buttons .btn{width:100%}
  .features-grid,.contact-grid{grid-template-columns:1fr}
  .contact-section{padding-top:72px}
  .contact-shell{padding:26px 20px;border-radius:24px}
  .section{padding:78px 0}
  .footer-inner{flex-direction:column;text-align:center}
}
@media(prefers-reduced-motion:reduce){
  *,*:before,*:after{animation-duration:.001ms;animation-iteration-count:1;transition-duration:.001ms;scroll-behavior:auto}
}

:where(a,button,input,textarea,select):focus-visible{outline:3px solid var(--accent);outline-offset:3px}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation-duration:.01ms;animation-iteration-count:1;transition-duration:.01ms;scroll-behavior:auto}}

/* Consistent localized focus and legibility */
html,body,button,input,select,textarea{font-family:var(--ah-font)}

/* Studio polish: font and interactive clarity */
:where(input,button,select,textarea):focus-visible{outline:3px solid #89a9ff;outline-offset:3px}input::placeholder{opacity:.85}button{cursor:pointer}i.ti svg{display:inline-block;vertical-align:middle}