:root {
  --bg: #ffffff;
  --bg-soft: #f4f7fb;
  --bg-dark: #0b1630;
  --text: #0f1b33;
  --muted: #5b6b85;
  --line: #e3e9f2;
  --primary: #0b5fff;
  --primary-2: #00b3c7;
  --on-dark: #e8eefc;
  --on-dark-muted: #9fb0d1;
  --radius: 16px;
  --shadow: 0 10px 30px rgba(15, 27, 51, .08);
  --max: 1160px;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0a1224;
    --bg-soft: #0f1a33;
    --bg-dark: #060c1a;
    --text: #e8eefc;
    --muted: #9fb0d1;
    --line: #1e2b4a;
    --primary: #4d8bff;
    --primary-2: #2fd3e3;
    --shadow: 0 10px 30px rgba(0, 0, 0, .35);
  }
}
:root[data-theme="dark"] {
  --bg: #0a1224;
  --bg-soft: #0f1a33;
  --bg-dark: #060c1a;
  --text: #e8eefc;
  --muted: #9fb0d1;
  --line: #1e2b4a;
  --primary: #4d8bff;
  --primary-2: #2fd3e3;
  --shadow: 0 10px 30px rgba(0, 0, 0, .35);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: "Be Vietnam Pro", system-ui, -apple-system, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img, svg { display: block; max-width: 100%; }
.container { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 16px; }
@media (min-width: 768px) { .container { padding: 0 32px; } }

/* ---------- Header ---------- */
header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: saturate(160%) blur(12px);
  border-bottom: 1px solid var(--line);
}
.nav { display: flex; align-items: center; justify-content: space-between; height: 68px; }
.logo { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 20px; letter-spacing: .5px; }
.logo-mark {
  width: 36px; height: 36px; border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  display: grid; place-items: center; color: #fff; font-size: 14px; font-weight: 800;
}
.logo small { display: block; font-size: 11px; font-weight: 500; color: var(--muted); letter-spacing: 0; line-height: 1.1; }
.menu { display: none; gap: 28px; font-size: 15px; font-weight: 500; color: var(--muted); }
.menu a:hover { color: var(--primary); }
.nav-actions { display: flex; align-items: center; gap: 10px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 22px; border-radius: 999px; font-weight: 600; font-size: 15px;
  border: 1px solid transparent; cursor: pointer; transition: transform .15s, box-shadow .15s, background .15s;
  font-family: inherit;
}
.btn-primary { background: var(--primary); color: #fff; box-shadow: 0 6px 18px color-mix(in srgb, var(--primary) 35%, transparent); }
.btn-primary:hover { transform: translateY(-1px); }
.btn-ghost { border-color: var(--line); color: var(--text); background: transparent; }
.btn-ghost:hover { border-color: var(--primary); color: var(--primary); }
.btn-sm { padding: 9px 16px; font-size: 14px; }
.icon-btn {
  width: 40px; height: 40px; border-radius: 50%; border: 1px solid var(--line);
  background: transparent; color: var(--text); cursor: pointer; display: grid; place-items: center;
}
.burger { display: grid; }
.mobile-menu {
  display: none; flex-direction: column; padding: 8px 16px 16px;
  border-bottom: 1px solid var(--line); background: var(--bg);
}
.mobile-menu a { padding: 12px 0; border-bottom: 1px solid var(--line); font-weight: 500; }
.mobile-menu.open { display: flex; }
@media (min-width: 900px) {
  .menu { display: flex; }
  .burger { display: none; }
  .mobile-menu.open { display: none; }
}
.hide-sm { display: none; }
@media (min-width: 600px) { .hide-sm { display: inline-flex; } }

/* ---------- Hero ---------- */
.hero { position: relative; overflow: hidden; padding: 72px 0 88px; }
.hero::before {
  content: ""; position: absolute; inset: -40% -20% auto auto; width: 720px; height: 720px;
  background: radial-gradient(circle, color-mix(in srgb, var(--primary-2) 22%, transparent), transparent 65%);
  pointer-events: none;
}
.hero::after {
  content: ""; position: absolute; inset: auto auto -50% -20%; width: 640px; height: 640px;
  background: radial-gradient(circle, color-mix(in srgb, var(--primary) 18%, transparent), transparent 65%);
  pointer-events: none;
}
.hero-grid { position: relative; z-index: 1; display: grid; gap: 48px; align-items: center; }
@media (min-width: 960px) { .hero-grid { grid-template-columns: 1.1fr .9fr; } .hero { padding: 104px 0 120px; } }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px; padding: 6px 14px; border-radius: 999px;
  background: color-mix(in srgb, var(--primary) 10%, transparent); color: var(--primary);
  font-size: 13px; font-weight: 600;
}
.eyebrow .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--primary-2); }
h1 { font-size: clamp(34px, 5.4vw, 58px); line-height: 1.12; font-weight: 800; letter-spacing: -1px; margin: 20px 0; }
.grad { background: linear-gradient(90deg, var(--primary), var(--primary-2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.lead { font-size: 18px; color: var(--muted); max-width: 560px; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
.hero-facts { display: flex; flex-wrap: wrap; gap: 28px; margin-top: 44px; }
.hero-facts div strong { display: block; font-size: 26px; font-weight: 800; }
.hero-facts div span { font-size: 14px; color: var(--muted); }

.hero-visual {
  background: var(--bg-soft); border: 1px solid var(--line); border-radius: 24px;
  padding: 24px; box-shadow: var(--shadow);
}
.hv-head { display: flex; gap: 6px; margin-bottom: 18px; }
.hv-head span { width: 10px; height: 10px; border-radius: 50%; background: var(--line); }
.hv-flow { display: grid; gap: 12px; }
.hv-step {
  display: flex; align-items: center; gap: 14px; padding: 14px 16px; border-radius: 14px;
  background: var(--bg); border: 1px solid var(--line);
}
.hv-step .n {
  flex: none; width: 34px; height: 34px; border-radius: 10px; display: grid; place-items: center;
  font-weight: 700; font-size: 14px; color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
}
.hv-step b { display: block; font-size: 15px; }
.hv-step small { color: var(--muted); font-size: 13px; }
.hv-bar { height: 6px; border-radius: 6px; background: var(--line); margin-top: 18px; overflow: hidden; }
.hv-bar i { display: block; height: 100%; width: 72%; background: linear-gradient(90deg, var(--primary), var(--primary-2)); border-radius: 6px; }

/* ---------- Sections ---------- */
section { padding: 80px 0; }
.soft { background: var(--bg-soft); }
.sec-head { max-width: 680px; margin-bottom: 48px; }
.sec-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.kicker { color: var(--primary); font-weight: 700; font-size: 13px; text-transform: uppercase; letter-spacing: 1.5px; }
h2 { font-size: clamp(28px, 3.6vw, 40px); line-height: 1.2; font-weight: 800; letter-spacing: -.5px; margin: 10px 0 14px; }
.sec-head p { color: var(--muted); font-size: 17px; }

/* About */
.about-grid { display: grid; gap: 40px; }
@media (min-width: 900px) { .about-grid { grid-template-columns: 1.1fr .9fr; align-items: center; } }
.about-text p { color: var(--muted); margin-bottom: 16px; font-size: 16px; }
.values { display: grid; gap: 14px; margin-top: 24px; }
.value { display: flex; gap: 14px; align-items: flex-start; }
.value .chk {
  flex: none; width: 26px; height: 26px; border-radius: 50%; display: grid; place-items: center;
  background: color-mix(in srgb, var(--primary-2) 18%, transparent); color: var(--primary-2); font-weight: 800; font-size: 13px;
}
.value b { display: block; }
.value span { color: var(--muted); font-size: 15px; }

/* Services */
.services { display: grid; gap: 20px; grid-template-columns: 1fr; }
@media (min-width: 640px) { .services { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1000px) { .services { grid-template-columns: repeat(3, 1fr); } }
.svc {
  background: var(--bg); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 28px; transition: transform .2s, box-shadow .2s, border-color .2s;
}
.svc:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: color-mix(in srgb, var(--primary) 40%, var(--line)); }
.svc .ic {
  width: 48px; height: 48px; border-radius: 12px; display: grid; place-items: center; margin-bottom: 18px;
  background: color-mix(in srgb, var(--primary) 10%, transparent); color: var(--primary);
}
.svc h3 { font-size: 19px; margin-bottom: 8px; }
.svc p { color: var(--muted); font-size: 15px; }
.svc ul { list-style: none; margin-top: 14px; display: grid; gap: 6px; font-size: 14px; }
.svc li::before { content: "→ "; color: var(--primary); font-weight: 700; }

/* Process */
.process { display: grid; gap: 20px; grid-template-columns: 1fr; counter-reset: step; }
@media (min-width: 640px) { .process { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1000px) { .process { grid-template-columns: repeat(4, 1fr); } }
.step { position: relative; padding: 28px 24px; border-radius: var(--radius); background: var(--bg); border: 1px solid var(--line); }
.step::before {
  counter-increment: step; content: "0" counter(step);
  font-size: 40px; font-weight: 800; line-height: 1;
  background: linear-gradient(135deg, var(--primary), var(--primary-2)); -webkit-background-clip: text; background-clip: text; color: transparent;
  display: block; margin-bottom: 14px;
}
.step h3 { font-size: 18px; margin-bottom: 6px; }
.step p { color: var(--muted); font-size: 15px; }

/* Industries */
.chips { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; }
.chip {
  padding: 12px 20px; border-radius: 999px; border: 1px solid var(--line); background: var(--bg);
  font-weight: 600; font-size: 15px;
}

/* Why */
.why-grid { display: grid; gap: 20px; grid-template-columns: 1fr; }
@media (min-width: 768px) { .why-grid { grid-template-columns: repeat(2, 1fr); } }
.why { display: flex; gap: 18px; padding: 24px; border-radius: var(--radius); border: 1px solid var(--line); background: var(--bg); }
.why .ic { flex: none; width: 44px; height: 44px; border-radius: 12px; display: grid; place-items: center; background: color-mix(in srgb, var(--primary-2) 16%, transparent); color: var(--primary-2); }
.why h3 { font-size: 17px; margin-bottom: 4px; }
.why p { color: var(--muted); font-size: 15px; }

/* CTA / Contact */
.contact { background: var(--bg-dark); color: var(--on-dark); }
.contact .kicker { color: var(--primary-2); }
.contact .sec-head p { color: var(--on-dark-muted); }
.contact-grid { display: grid; gap: 32px; }
@media (min-width: 900px) { .contact-grid { grid-template-columns: .9fr 1.1fr; } }
.c-item { display: flex; gap: 14px; padding: 18px 0; border-bottom: 1px solid rgba(255,255,255,.08); }
.c-item .ic { flex: none; width: 40px; height: 40px; border-radius: 10px; display: grid; place-items: center; background: rgba(255,255,255,.06); color: var(--primary-2); }
.c-item small { display: block; color: var(--on-dark-muted); font-size: 13px; }
.c-item b { font-weight: 600; }
form { background: rgba(255,255,255,.04); border: 1px solid rgba(255,255,255,.08); border-radius: 20px; padding: 28px; display: grid; gap: 16px; }
.f-row { display: grid; gap: 16px; }
@media (min-width: 600px) { .f-row { grid-template-columns: 1fr 1fr; } }
label { display: grid; gap: 6px; font-size: 14px; color: var(--on-dark-muted); }
input, select, textarea {
  font: inherit; color: var(--on-dark); background: rgba(255,255,255,.05);
  border: 1px solid rgba(255,255,255,.12); border-radius: 10px; padding: 12px 14px; width: 100%;
}
select option { color: #0f1b33; }
input:focus, select:focus, textarea:focus { outline: 2px solid var(--primary-2); outline-offset: 1px; border-color: transparent; }
textarea { min-height: 120px; resize: vertical; }
.form-note { font-size: 14px; color: var(--primary-2); min-height: 1.4em; }

footer { background: var(--bg-dark); color: var(--on-dark-muted); border-top: 1px solid rgba(255,255,255,.08); padding: 28px 0; font-size: 14px; }
.foot { display: flex; flex-wrap: wrap; gap: 12px; justify-content: space-between; }

.reveal { opacity: 0; transform: translateY(18px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* Nút chuyển ngôn ngữ */
.lang-btn { width: auto; padding: 0 12px; border-radius: 999px; font-weight: 700; font-size: 13px; letter-spacing: .5px; }
.lang-btn:hover { border-color: var(--primary); color: var(--primary); }