/* AVI Solutions — màu theo logo: xanh dương đậm, xanh lam, cyan, điểm nhấn cam-vàng */
:root {
  --navy: #0b2a7a;
  --blue: #1f6fe5;
  --sky: #2aa8f2;
  --cyan: #3ee6e6;
  --orange: #ff8a1f;
  --amber: #ffc933;
  --ink: #0f1b3d;
  --text: #3a4666;
  --muted: #6b7694;
  --line: #e3e9f5;
  --bg: #ffffff;
  --bg-soft: #f4f8ff;
  --grad: linear-gradient(120deg, var(--blue) 0%, var(--sky) 55%, var(--cyan) 100%);
  --grad-warm: linear-gradient(135deg, var(--amber), var(--orange));
  --radius: 16px;
  --shadow: 0 12px 40px -12px rgba(15, 50, 140, 0.22);
  --max: 1180px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: "Be Vietnam Pro", system-ui, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
h1, h2, h3, h4 { color: var(--ink); line-height: 1.25; font-weight: 700; }
.container { max-width: var(--max); margin: 0 auto; padding: 0 20px; }
.grad-text { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 26px; border-radius: 999px; font-weight: 600; font-size: 15px;
  transition: transform .2s, box-shadow .2s, background .2s; cursor: pointer; border: 0;
}
.btn-primary { background: var(--grad); color: #fff; box-shadow: 0 10px 28px -10px rgba(31, 111, 229, .7); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 16px 34px -10px rgba(31, 111, 229, .8); }
.btn-warm { background: var(--grad-warm); color: #fff; box-shadow: 0 10px 28px -10px rgba(255, 138, 31, .7); }
.btn-warm:hover { transform: translateY(-2px); }
.btn-ghost { background: #fff; color: var(--navy); border: 1.5px solid var(--line); }
.btn-ghost:hover { border-color: var(--sky); color: var(--blue); }

/* Header */
.header {
  position: fixed; inset: 0 0 auto 0; z-index: 50;
  background: rgba(255, 255, 255, .85); backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent; transition: border-color .3s, box-shadow .3s;
}
.header.scrolled { border-color: var(--line); box-shadow: 0 6px 24px -16px rgba(15, 50, 140, .3); }
.nav { display: flex; align-items: center; justify-content: space-between; height: 72px; }
.brand img { height: 52px; width: auto; mix-blend-mode: multiply; }
.menu { display: flex; gap: 30px; list-style: none; font-weight: 500; font-size: 15px; color: var(--ink); }
.menu a { position: relative; padding: 6px 0; }
.menu a::after { content: ""; position: absolute; left: 0; bottom: 0; height: 2px; width: 0; background: var(--grad); transition: width .25s; }
.menu a:hover::after { width: 100%; }
.nav-cta { display: flex; gap: 12px; align-items: center; }
.burger { display: none; background: none; border: 0; width: 40px; height: 40px; cursor: pointer; }
.burger span { display: block; height: 2px; background: var(--ink); margin: 6px 8px; border-radius: 2px; transition: .3s; }

/* Hero */
.hero { position: relative; padding: 150px 0 90px; overflow: hidden; background: radial-gradient(1200px 600px at 85% -10%, #e2f6ff 0%, transparent 60%), radial-gradient(900px 500px at -10% 30%, #eaf1ff 0%, transparent 60%); }
.hero::before {
  content: ""; position: absolute; width: 1400px; height: 520px; border-radius: 50%;
  border: 3px solid transparent; border-top-color: rgba(42, 168, 242, .35); border-left-color: rgba(62, 230, 230, .3);
  top: 40px; left: 50%; transform: translateX(-50%) rotate(-8deg); pointer-events: none;
}
.hero-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 56px; align-items: center; position: relative; }
.eyebrow { display: inline-flex; align-items: center; gap: 10px; padding: 7px 16px; border-radius: 999px; background: #fff; border: 1px solid var(--line); font-size: 13px; font-weight: 600; color: var(--blue); letter-spacing: .04em; box-shadow: var(--shadow); }
.eyebrow i { width: 8px; height: 8px; border-radius: 50%; background: var(--grad-warm); }
.hero h1 { font-size: clamp(34px, 5vw, 58px); margin: 22px 0 20px; letter-spacing: -.02em; }
.hero p.lead { font-size: 18px; max-width: 560px; color: var(--text); }
.hero-actions { display: flex; gap: 14px; margin-top: 34px; flex-wrap: wrap; }
.hero-stats { display: flex; gap: 40px; margin-top: 48px; flex-wrap: wrap; }
.hero-stats b { display: block; font-size: 30px; color: var(--navy); font-weight: 800; }
.hero-stats span { font-size: 14px; color: var(--muted); }

.hero-visual { position: relative; }
.mock {
  background: #fff; border-radius: 22px; box-shadow: 0 30px 80px -24px rgba(15, 50, 140, .35); border: 1px solid var(--line); padding: 18px; position: relative; z-index: 2;
}
.mock-top { display: flex; gap: 6px; margin-bottom: 14px; }
.mock-top i { width: 10px; height: 10px; border-radius: 50%; background: #e3e9f5; }
.mock-top i:first-child { background: #ff8a1f; } .mock-top i:nth-child(2) { background: #ffc933; } .mock-top i:nth-child(3) { background: #3ee6e6; }
.kpis { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.kpi { background: var(--bg-soft); border-radius: 12px; padding: 12px; }
.kpi small { font-size: 11px; color: var(--muted); display: block; }
.kpi b { font-size: 17px; color: var(--navy); }
.kpi em { font-style: normal; font-size: 11px; color: #12a35a; font-weight: 600; }
.chart { margin-top: 12px; height: 150px; background: var(--bg-soft); border-radius: 12px; display: flex; align-items: flex-end; gap: 8px; padding: 14px; }
.chart span { flex: 1; border-radius: 6px 6px 2px 2px; background: var(--grad); opacity: .9; animation: grow 1.4s ease both; transform-origin: bottom; }
.chart span:nth-child(odd) { opacity: .55; }
@keyframes grow { from { transform: scaleY(0); } }
.chat-bubble {
  position: absolute; z-index: 3; background: #fff; border-radius: 16px; padding: 12px 16px; box-shadow: var(--shadow); border: 1px solid var(--line); font-size: 13px; max-width: 230px;
}
.chat-bubble b { color: var(--navy); display: flex; align-items: center; gap: 6px; font-size: 12px; margin-bottom: 2px; }
.chat-bubble b::before { content: ""; width: 18px; height: 18px; border-radius: 6px; background: var(--grad); }
.bubble-1 { left: -40px; bottom: -28px; animation: float 5s ease-in-out infinite; }
.bubble-2 { right: -24px; top: -30px; animation: float 6s ease-in-out infinite reverse; }
.bubble-2 b::before { background: var(--grad-warm); }
@keyframes float { 50% { transform: translateY(-10px); } }

/* Logos strip */
.trust { padding: 30px 0 10px; text-align: center; color: var(--muted); font-size: 14px; }
.trust-row { display: flex; justify-content: center; gap: 42px; flex-wrap: wrap; margin-top: 16px; font-weight: 700; color: #a8b3cc; font-size: 17px; letter-spacing: .02em; }

/* Sections */
section { padding: 96px 0; }
.section-head { text-align: center; max-width: 720px; margin: 0 auto 56px; }
.tag { font-size: 13px; font-weight: 700; letter-spacing: .14em; text-transform: uppercase; color: var(--blue); }
.section-head h2 { font-size: clamp(28px, 3.6vw, 42px); margin: 12px 0 14px; letter-spacing: -.01em; }
.section-head p { font-size: 17px; color: var(--muted); }
.soft { background: var(--bg-soft); }

/* Pillars */
.pillars { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.pillar { padding: 34px 30px; border-radius: var(--radius); background: #fff; border: 1px solid var(--line); position: relative; overflow: hidden; transition: transform .3s, box-shadow .3s; }
.pillar:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.pillar .num { position: absolute; right: 22px; top: 12px; font-size: 64px; font-weight: 800; color: #eef3fc; }
.pillar h3 { font-size: 22px; margin: 18px 0 10px; position: relative; }
.icon { width: 54px; height: 54px; border-radius: 14px; background: var(--grad); display: grid; place-items: center; color: #fff; position: relative; }
.icon svg { width: 26px; height: 26px; }
.icon.warm { background: var(--grad-warm); }

/* Services */
.services { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.service { background: #fff; border-radius: var(--radius); padding: 28px; border: 1px solid var(--line); transition: .3s; display: flex; flex-direction: column; }
.service:hover { border-color: transparent; box-shadow: var(--shadow); transform: translateY(-4px); }
.service h3 { font-size: 19px; margin: 18px 0 8px; }
.service p { font-size: 15px; flex: 1; }
.service ul { list-style: none; margin-top: 16px; font-size: 14px; }
.service li { padding-left: 22px; position: relative; margin: 6px 0; }
.service li::before { content: ""; position: absolute; left: 0; top: 7px; width: 12px; height: 12px; border-radius: 4px; background: var(--grad); opacity: .85; }

/* ERP */
.erp-grid { display: grid; grid-template-columns: .95fr 1.05fr; gap: 60px; align-items: center; }
.erp-copy h2 { font-size: clamp(28px, 3.4vw, 40px); margin: 12px 0 18px; }
.erp-copy p { font-size: 17px; }
.checks { list-style: none; margin: 26px 0 32px; display: grid; gap: 12px; }
.checks li { display: flex; gap: 12px; align-items: flex-start; }
.checks li::before { content: "✓"; flex: none; width: 24px; height: 24px; border-radius: 50%; background: var(--grad-warm); color: #fff; display: grid; place-items: center; font-size: 13px; font-weight: 700; margin-top: 2px; }
.modules { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.module { background: #fff; border: 1px solid var(--line); border-radius: 14px; padding: 18px 16px; transition: .25s; }
.module:hover { border-color: var(--sky); transform: translateY(-3px); }
.module b { display: block; color: var(--ink); font-size: 15px; margin-bottom: 4px; }
.module span { font-size: 13px; color: var(--muted); line-height: 1.5; display: block; }
.module .dot { width: 30px; height: 4px; border-radius: 4px; background: var(--grad); margin-bottom: 12px; }
.module:nth-child(4n+2) .dot { background: var(--grad-warm); }

/* Pricing */
.billing-toggle { display: inline-flex; background: #fff; border: 1px solid var(--line); border-radius: 999px; padding: 4px; margin-top: 22px; }
.billing-toggle button { border: 0; background: none; padding: 9px 20px; border-radius: 999px; font: inherit; font-weight: 600; font-size: 14px; color: var(--muted); cursor: pointer; }
.billing-toggle button.active { background: var(--grad); color: #fff; }
.plans { display: grid; grid-template-columns: repeat(5, 1fr); gap: 16px; align-items: stretch; }
.plan { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 26px 20px; display: flex; flex-direction: column; position: relative; transition: .3s; }
.plan:hover { box-shadow: var(--shadow); }
.plan.featured { border: 2px solid transparent; background: linear-gradient(#fff, #fff) padding-box, var(--grad) border-box; box-shadow: var(--shadow); transform: translateY(-8px); }
.badge { position: absolute; top: -13px; left: 50%; transform: translateX(-50%); background: var(--grad-warm); color: #fff; font-size: 12px; font-weight: 700; padding: 4px 14px; border-radius: 999px; white-space: nowrap; }
.plan h3 { font-size: 18px; }
.plan .for { font-size: 13px; color: var(--muted); min-height: 40px; margin-top: 4px; }
.price { margin: 16px 0 4px; color: var(--navy); }
.price b { font-size: 28px; font-weight: 800; }
.price small { font-size: 13px; color: var(--muted); }
.setup { font-size: 12.5px; color: var(--muted); padding-bottom: 16px; border-bottom: 1px dashed var(--line); }
.plan ul { list-style: none; font-size: 13.5px; margin: 16px 0 22px; flex: 1; }
.plan li { padding-left: 20px; position: relative; margin: 7px 0; line-height: 1.45; }
.plan li::before { content: "✓"; position: absolute; left: 0; color: var(--blue); font-weight: 700; }
.plan .btn { justify-content: center; padding: 11px; font-size: 14px; }
.price-note { text-align: center; font-size: 14px; color: var(--muted); margin-top: 30px; }

/* Process */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; counter-reset: s; position: relative; }
.steps::before { content: ""; position: absolute; top: 28px; left: 12%; right: 12%; height: 2px; background: linear-gradient(90deg, var(--blue), var(--cyan)); opacity: .35; }
.step { text-align: center; position: relative; padding: 0 8px; }
.step::before { counter-increment: s; content: "0" counter(s); display: grid; place-items: center; width: 58px; height: 58px; margin: 0 auto 20px; border-radius: 50%; background: #fff; border: 2px solid var(--sky); color: var(--blue); font-weight: 800; font-size: 18px; position: relative; box-shadow: 0 0 0 8px var(--bg-soft); }
.step h4 { font-size: 18px; margin-bottom: 8px; }
.step p { font-size: 14.5px; }

/* Why */
.why { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.why-card { padding: 26px; border-radius: var(--radius); background: #fff; border: 1px solid var(--line); }
.why-card h4 { font-size: 17px; margin: 14px 0 6px; }
.why-card p { font-size: 14.5px; }

/* Industries */
.chips { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; }
.chips span { padding: 10px 20px; border-radius: 999px; background: #fff; border: 1px solid var(--line); font-weight: 500; color: var(--ink); font-size: 15px; transition: .2s; }
.chips span:hover { border-color: var(--sky); color: var(--blue); }

/* FAQ */
.faq { max-width: 820px; margin: 0 auto; }
.faq details { background: #fff; border: 1px solid var(--line); border-radius: 14px; margin-bottom: 12px; padding: 0 22px; transition: border-color .2s; }
.faq details[open] { border-color: var(--sky); }
.faq summary { cursor: pointer; list-style: none; padding: 18px 0; font-weight: 600; color: var(--ink); display: flex; justify-content: space-between; gap: 16px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font-size: 22px; color: var(--blue); line-height: 1; transition: transform .2s; }
.faq details[open] summary::after { transform: rotate(45deg); }
.faq details p { padding-bottom: 18px; font-size: 15px; }

/* CTA + Contact */
.cta-band { background: var(--grad); border-radius: 28px; padding: 56px; color: #fff; display: grid; grid-template-columns: 1fr 1fr; gap: 48px; position: relative; overflow: hidden; }
.cta-band::after { content: ""; position: absolute; width: 520px; height: 520px; border-radius: 50%; border: 60px solid rgba(255, 255, 255, .08); right: -160px; top: -200px; }
.cta-band h2 { color: #fff; font-size: clamp(28px, 3.4vw, 40px); margin-bottom: 14px; }
.cta-band p { color: rgba(255, 255, 255, .9); }
.contact-list { list-style: none; margin-top: 28px; display: grid; gap: 14px; }
.contact-list li { display: flex; gap: 12px; align-items: center; }
.contact-list i { width: 40px; height: 40px; border-radius: 12px; background: rgba(255, 255, 255, .18); display: grid; place-items: center; font-style: normal; flex: none; }
form.contact { background: #fff; border-radius: 20px; padding: 28px; display: grid; gap: 14px; position: relative; z-index: 1; box-shadow: 0 24px 60px -20px rgba(0, 20, 80, .45); }
form.contact .row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
form.contact label { font-size: 13px; font-weight: 600; color: var(--ink); display: grid; gap: 6px; }
form.contact input, form.contact select, form.contact textarea { font: inherit; font-size: 15px; padding: 11px 14px; border: 1.5px solid var(--line); border-radius: 10px; color: var(--ink); background: #fff; outline: none; transition: border-color .2s; width: 100%; }
form.contact input:focus, form.contact select:focus, form.contact textarea:focus { border-color: var(--sky); }
form.contact textarea { resize: vertical; min-height: 90px; }
.form-msg { font-size: 14px; color: #12a35a; font-weight: 600; display: none; }

/* Footer */
footer { background: #071a4d; color: #b9c5e6; padding: 64px 0 28px; margin-top: 96px; }
.foot-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 40px; }
.foot-logo { background: #fff; border-radius: 14px; padding: 8px 14px; display: inline-block; }
.foot-logo img { height: 50px; }
footer h5 { color: #fff; font-size: 15px; margin-bottom: 14px; }
footer ul { list-style: none; display: grid; gap: 8px; font-size: 14.5px; }
footer a:hover { color: var(--cyan); }
.foot-bottom { border-top: 1px solid rgba(255, 255, 255, .1); margin-top: 44px; padding-top: 22px; display: flex; justify-content: space-between; font-size: 13.5px; flex-wrap: wrap; gap: 10px; }

/* Reveal */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity .7s ease, transform .7s ease; }
.reveal.in { opacity: 1; transform: none; }

/* Responsive */
@media (max-width: 1100px) {
  .plans { grid-template-columns: repeat(3, 1fr); }
  .plan.featured { transform: none; }
}
@media (max-width: 960px) {
  .hero-grid, .erp-grid, .cta-band { grid-template-columns: 1fr; }
  .hero-visual { max-width: 520px; margin: 30px auto 0; }
  .pillars, .services { grid-template-columns: 1fr 1fr; }
  .why { grid-template-columns: 1fr 1fr; }
  .steps { grid-template-columns: 1fr 1fr; row-gap: 40px; }
  .steps::before { display: none; }
  .foot-grid { grid-template-columns: 1fr 1fr; }
  .menu, .nav-cta .btn-ghost { display: none; }
  .burger { display: block; }
  .menu.open { display: flex; flex-direction: column; position: absolute; top: 72px; left: 0; right: 0; background: #fff; padding: 20px; gap: 16px; border-bottom: 1px solid var(--line); box-shadow: var(--shadow); }
}
@media (max-width: 640px) {
  section { padding: 72px 0; }
  .container { padding: 0 16px; }
  .pillars, .services, .why, .plans, .modules, .steps, .foot-grid, form.contact .row { grid-template-columns: 1fr; }
  .modules { grid-template-columns: 1fr 1fr; }
  .cta-band { padding: 32px 22px; border-radius: 22px; }
  .hero { padding-top: 120px; }
  .bubble-1 { left: 0; bottom: -36px; } .bubble-2 { right: 0; }
  .nav-cta .btn-primary { padding: 10px 16px; font-size: 13px; }
  .brand img { height: 42px; }
}
@media (prefers-reduced-motion: reduce) { * { animation: none !important; transition: none !important; } .reveal { opacity: 1; transform: none; } }