:root {
  /* Bảng màu lấy theo memon.vn: cyan logo, hồng banner, tím nút */
  --cyan: #3ec6e0;
  --pink: #ec4899;
  --pink-dark: #db2777;
  --purple: #7d61c5;
  --pink-soft: #fdf2f8;
  --purple-soft: #f5f2fb;
  --ink: #333333;
  --ink-light: #6b7280;
  --border: #e5e7eb;
  --zalo-blue: #0068ff;
  --radius: 16px;
  --max-width: 1160px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "Be Vietnam Pro", -apple-system, "Segoe UI", sans-serif;
  color: var(--ink);
  line-height: 1.6;
  background: #fff;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

h1, h2, h3 { margin: 0 0 .5em; line-height: 1.25; }

a { color: inherit; text-decoration: none; }

img { max-width: 100%; display: block; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 15px;
  border: none;
  cursor: pointer;
  transition: transform .15s ease, box-shadow .15s ease;
  white-space: nowrap;
}
.btn:hover { transform: translateY(-1px); }

.btn-zalo {
  background: var(--zalo-blue);
  color: #fff;
  box-shadow: 0 4px 14px rgba(0,104,255,.3);
}
.btn-zalo:hover { box-shadow: 0 6px 18px rgba(0,104,255,.4); }

.btn-lg { padding: 16px 30px; font-size: 17px; }

/* ---------- Placeholder boxes ---------- */
.placeholder-box {
  background: repeating-linear-gradient(45deg, #f9fafb, #f9fafb 10px, #f3f4f6 10px, #f3f4f6 20px);
  border: 2px dashed #d1d5db;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--ink-light);
  font-size: 14px;
  text-align: center;
  padding: 20px;
  min-height: 180px;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,.9);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  display: flex;
  align-items: center;
  gap: 24px;
  padding-top: 14px;
  padding-bottom: 14px;
}
.logo { display: flex; flex-direction: column; line-height: 1.1; margin-right: auto; }
.logo-mark {
  font-weight: 800;
  font-size: 22px;
  color: var(--cyan);
}
.logo-sub { font-size: 11px; color: var(--ink-light); letter-spacing: .04em; text-transform: uppercase; }

.main-nav { display: flex; gap: 24px; }
.main-nav a { font-weight: 500; font-size: 15px; color: var(--ink); }
.main-nav a:hover { color: var(--pink-dark); }

.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 22px;
  cursor: pointer;
}

/* ---------- Hero ---------- */
.hero {
  background: linear-gradient(160deg, var(--pink-soft), var(--purple-soft));
  padding: 64px 0 80px;
}
.hero-inner {
  display: grid;
  grid-template-columns: 1.1fr .9fr;
  gap: 48px;
  align-items: center;
}
.eyebrow {
  font-weight: 600;
  color: var(--pink-dark);
  text-transform: uppercase;
  letter-spacing: .05em;
  font-size: 13px;
  margin-bottom: 12px;
}
.hero h1 {
  font-size: 40px;
  font-weight: 800;
  letter-spacing: -.01em;
}
.hero h1 span {
  background: linear-gradient(90deg, var(--pink-dark), var(--purple));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-desc {
  font-size: 17px;
  color: var(--ink-light);
  margin-bottom: 20px;
  max-width: 52ch;
}
.hero-trust {
  font-size: 15px;
  margin-bottom: 28px;
  color: var(--ink);
}
.hero-media { min-height: 340px; }

/* ---------- Trust bar ---------- */
.trust-bar { padding: 48px 0; background: #fff; }
.trust-heading {
  text-align: center;
  font-weight: 600;
  font-size: 16px;
  margin-bottom: 28px;
  color: var(--ink);
}
.logo-group { margin-bottom: 20px; }
.logo-group-label {
  display: block;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .05em;
  color: var(--purple);
  margin-bottom: 10px;
}
.logo-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.logo-chip {
  padding: 8px 16px;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-weight: 600;
  font-size: 13px;
  color: var(--ink-light);
  background: #f9fafb;
}
.trust-note {
  font-size: 12px;
  color: var(--ink-light);
  margin-top: 16px;
  font-style: italic;
}

/* ---------- Section title ---------- */
.section-title {
  text-align: center;
  font-size: 30px;
  font-weight: 800;
}
.section-sub {
  text-align: center;
  color: var(--ink-light);
  margin-top: -8px;
  margin-bottom: 32px;
}

/* ---------- Use cases ---------- */
.use-cases { padding: 72px 0; background: var(--pink-soft); }
.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 36px;
}
.use-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 26px 22px;
  border: 1px solid var(--border);
}
.use-icon { font-size: 30px; margin-bottom: 12px; }
.use-card h3 { font-size: 18px; }
.use-card p { color: var(--ink-light); font-size: 14px; margin: 0; }

/* ---------- Case studies ---------- */
.case-studies { padding: 72px 0; }
.case-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 20px;
}
.case-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.case-media { min-height: 200px; border-radius: 0; border-width: 0 0 1px 0; }
.case-body { padding: 20px; }
.case-tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .04em;
  color: var(--purple);
  background: var(--purple-soft);
  padding: 4px 10px;
  border-radius: 999px;
  margin-bottom: 10px;
}
.case-body h3 { font-size: 19px; }
.case-body p { color: var(--ink-light); font-size: 14px; margin: 0; }

/* ---------- Capability ---------- */
.capability { padding: 72px 0; background: var(--purple-soft); }
.stat-row {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
  margin: 36px 0 48px;
  text-align: center;
}
.stat strong {
  display: block;
  font-size: 28px;
  font-weight: 800;
  background: linear-gradient(90deg, var(--pink-dark), var(--purple));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.stat span { font-size: 13px; color: var(--ink-light); }

.capability-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}
.capability-col {
  background: #fff;
  border-radius: var(--radius);
  padding: 26px;
  border: 1px solid var(--border);
}
.check-list { list-style: none; padding: 0; margin: 0; }
.check-list li {
  padding: 8px 0 8px 26px;
  position: relative;
  font-size: 14.5px;
  border-bottom: 1px dashed var(--border);
}
.check-list li:last-child { border-bottom: none; }
.check-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--pink-dark);
  font-weight: 700;
}

/* ---------- Process ---------- */
.process { padding: 72px 0; }
.process-row {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 14px;
  margin: 36px 0;
}
.process-step {
  text-align: center;
  padding: 20px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.step-num {
  width: 40px;
  height: 40px;
  margin: 0 auto 12px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--pink), var(--purple));
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 14px;
}
.process-step h3 { font-size: 15px; }
.process-step p { font-size: 13px; color: var(--ink-light); margin: 0; }
.center-cta { text-align: center; margin-top: 20px; }

/* ---------- Commitments ---------- */
.commitments { padding: 72px 0; background: var(--pink-soft); }
.commit-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 36px;
}
.commit-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 24px;
  border: 1px solid var(--border);
}
.commit-card.featured {
  border: 2px solid var(--pink);
  background: #fff;
}
.commit-card h3 { font-size: 16px; }
.commit-card p { font-size: 14px; color: var(--ink-light); margin: 0; }

/* ---------- FAQ ---------- */
.faq { padding: 72px 0; }
.faq-list { max-width: 760px; margin: 32px auto 0; }
.faq-item {
  border-bottom: 1px solid var(--border);
  padding: 16px 0;
}
.faq-item summary {
  cursor: pointer;
  font-weight: 600;
  font-size: 16px;
  list-style: none;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::before {
  content: "+";
  display: inline-block;
  width: 20px;
  color: var(--pink-dark);
  font-weight: 800;
}
.faq-item[open] summary::before { content: "–"; }
.faq-item p { color: var(--ink-light); margin: 12px 0 0 20px; font-size: 14.5px; }

/* ---------- Final CTA ---------- */
.final-cta {
  padding: 80px 0;
  text-align: center;
  background: linear-gradient(135deg, var(--pink-dark), var(--purple));
  color: #fff;
}
.final-cta h2 { font-size: 28px; }
.final-cta p { margin-bottom: 24px; opacity: .9; }
.final-cta .btn-zalo {
  background: #fff;
  color: var(--zalo-blue);
}

/* ---------- Footer ---------- */
.site-footer { padding: 48px 0; background: #111827; color: #d1d5db; }
.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}
.footer-logo { font-size: 20px; margin-bottom: 8px; }
.site-footer p { margin: 4px 0; font-size: 14px; }
.site-footer a:hover { color: #fff; }

/* ---------- Floating Zalo ---------- */
.zalo-float {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 58px;
  height: 58px;
  border-radius: 50%;
  background: var(--zalo-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 6px 20px rgba(0,104,255,.4);
  z-index: 200;
  animation: pulse 2.2s infinite;
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(0,104,255,.5), 0 6px 20px rgba(0,104,255,.4); }
  70% { box-shadow: 0 0 0 14px rgba(0,104,255,0), 0 6px 20px rgba(0,104,255,.4); }
  100% { box-shadow: 0 0 0 0 rgba(0,104,255,0), 0 6px 20px rgba(0,104,255,.4); }
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .hero-inner { grid-template-columns: 1fr; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .case-list { grid-template-columns: 1fr; }
  .stat-row { grid-template-columns: repeat(2, 1fr); row-gap: 24px; }
  .capability-grid { grid-template-columns: 1fr; }
  .process-row { grid-template-columns: repeat(3, 1fr); }
  .commit-grid { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .main-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: #fff;
    flex-direction: column;
    padding: 16px 24px;
    border-bottom: 1px solid var(--border);
    display: none;
  }
  .main-nav.open { display: flex; }
  .nav-toggle { display: block; }
  .header-cta { display: none; }
  .hero h1 { font-size: 30px; }
  .process-row { grid-template-columns: repeat(2, 1fr); }
}