/* ── CTA ─────────────────────────────────── */
.cta-section {
  text-align: center;
  padding: 100px 24px;
  position: relative; overflow: hidden;
  background:
    radial-gradient(ellipse 600px 300px at 50% 50%, var(--accent-ring) 0%, transparent 70%),
    linear-gradient(180deg, var(--bg) 0%, #faf5ff 100%);
}
.cta-section h2 {
  font-size: clamp(28px, 4.5vw, 44px);
  font-weight: 800; margin-bottom: 16px;
  letter-spacing: -1px; color: var(--text);
  max-width: 720px; margin-left: auto; margin-right: auto;
}
.cta-section p {
  color: var(--muted); font-size: 17px;
  margin-bottom: 36px;
  max-width: 540px; margin-left: auto; margin-right: auto;
}

/* Contact view: cta-section fills full viewport — no empty white strip below */
#view-contact .cta-section {
  min-height: calc(100vh - 64px - 44px); /* trừ nav + bottom-bar (luôn hiện ở view này) */
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

/* ── CONTACT GRID ────────────────────────── */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  max-width: 880px;
  margin: 48px auto 0;
  text-align: left;
}
.contact-card {
  position: relative;
  display: flex; align-items: center; gap: 16px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px 22px;
  text-decoration: none;
  color: inherit;
  transition: border-color .2s, box-shadow .25s, transform .2s, background .2s;
  box-shadow: var(--shadow-sm);
}
.contact-card:hover {
  border-color: #c4b5fd;
  box-shadow: var(--shadow-lg);
  transform: translateY(-3px);
}
.contact-card:hover .contact-arrow {
  color: var(--accent);
  transform: translate(2px, -2px);
}

.contact-icon {
  width: 52px; height: 52px;
  flex-shrink: 0;
  border-radius: 14px;
  display: grid; place-items: center;
  color: #fff;
  font-weight: 800; font-size: 22px;
  box-shadow: var(--shadow-sm);
}
.contact-icon svg { width: 26px; height: 26px; }
.contact-icon-telegram { background: linear-gradient(135deg, #2AABEE 0%, #229ED9 100%); }
.contact-icon-phone    { background: linear-gradient(135deg, #10b981 0%, #059669 100%); }
.contact-icon-zalo     { background: linear-gradient(135deg, #2962ff 0%, #0066ff 100%); font-family: 'Inter', sans-serif; letter-spacing: -1px; }
.contact-icon-group    { background: linear-gradient(135deg, #8b5cf6 0%, #6d28d9 100%); }

.contact-body {
  flex: 1; min-width: 0;
  display: flex; flex-direction: column; gap: 2px;
}
.contact-label {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 12px; font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 1px;
}
.contact-pill {
  background: var(--accent-soft);
  color: var(--accent-2);
  font-size: 10px;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 999px;
  text-transform: none;
  letter-spacing: 0;
}
.contact-value {
  font-size: 17px; font-weight: 700;
  color: var(--text);
  letter-spacing: -0.2px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.contact-meta {
  font-size: 13px; color: var(--muted);
}
.contact-arrow {
  width: 18px; height: 18px;
  color: var(--muted-2);
  flex-shrink: 0;
  transition: color .2s, transform .2s;
}

.contact-card-highlight {
  background: linear-gradient(135deg, #ffffff 0%, #faf5ff 100%);
  border-color: #ddd6fe;
}
.contact-card-highlight:hover {
  border-color: var(--accent);
}

@media (max-width: 720px) {
  .contact-grid { grid-template-columns: 1fr; max-width: 480px; }
  .contact-card { padding: 18px; }
  .contact-icon { width: 46px; height: 46px; border-radius: 12px; }
  .contact-icon svg { width: 22px; height: 22px; }
}

/* ── FOOTER ──────────────────────────────── */
footer {
  border-top: 1px solid var(--border);
  background: var(--bg-soft);
  color: var(--muted);
  font-size: 14px;
}
.footer-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 64px 40px 28px;
}
.footer-cols {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
  gap: 40px;
  padding-bottom: 48px;
}
.footer-brand-col .nav-logo {
  margin-bottom: 16px;
  font-size: 20px;
}
.footer-tag {
  font-size: 14px;
  line-height: 1.65;
  color: var(--muted);
  max-width: 320px;
  margin-bottom: 20px;
}
.footer-status {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13px;
  color: var(--text-soft);
  padding: 6px 12px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-weight: 500;
}
.footer-status-dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--success);
  box-shadow: 0 0 0 3px rgba(5,150,105,0.15);
  animation: pulse 2s infinite;
}

.footer-col h4 {
  font-size: 13px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 1px;
}
.footer-col ul {
  list-style: none;
  display: flex; flex-direction: column;
  gap: 10px;
}
.footer-col ul a {
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
  transition: color .2s;
}
.footer-col ul a:hover { color: var(--accent); }

.footer-contact-list li {
  display: flex; align-items: center; gap: 10px;
  color: var(--muted);
  font-size: 14px;
}
.footer-contact-list svg {
  width: 16px; height: 16px;
  flex-shrink: 0;
  color: var(--accent);
}
.footer-contact-list a { color: var(--text-soft); text-decoration: none; transition: color .2s; }
.footer-contact-list a:hover { color: var(--accent); }

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 24px;
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 16px;
  font-size: 13px;
  color: var(--muted-2);
}
.footer-bottom-meta {
  display: inline-flex; align-items: center; gap: 8px;
  flex-wrap: wrap;
}
.footer-bottom-meta strong { color: var(--accent); font-weight: 700; }
.footer-bullet { color: var(--border-strong); }

.footer-bottom-right {
  display: inline-flex; align-items: center; gap: 20px;
}
.footer-bottom-right a {
  color: var(--muted);
  text-decoration: none;
  transition: color .2s;
  display: inline-flex; align-items: center;
}
.footer-bottom-right a:hover { color: var(--accent); }

@media (max-width: 900px) {
  .footer-cols { grid-template-columns: 1fr 1fr; gap: 24px 20px; }
  .footer-brand-col { grid-column: 1 / -1; }
  .footer-inner { padding: 48px 24px 24px; }
}
@media (max-width: 560px) {
  .footer-cols { grid-template-columns: 1fr; gap: 24px; padding-bottom: 32px; }
  .footer-bottom { flex-direction: column; align-items: flex-start; text-align: left; }
  .footer-bottom-meta { font-size: 12px; }
}

/* ── RESPONSIVE ──────────────────────────── */
@media (max-width: 900px) {
  .usecase-flow { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .uc-step + .uc-step { margin-left: 0; }
  .uc-connector { display: none; }
  .steps-grid { grid-template-columns: 1fr; gap: 32px; }
  .steps-grid::before { display: none; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  nav { padding: 12px 20px; }
  .nav-links { display: none; }
  .section { padding: 70px 20px; }
  .hero { padding: 120px 18px 70px; }
  .version-banner { flex-direction: column; text-align: center; padding: 24px; }
  .hero-actions { width: 100%; }
  .hero-actions .btn-primary,
  .hero-actions .btn-secondary { flex: 1; justify-content: center; }
}


/* ── TESTIMONIALS ────────────────────────── */
.testimonials-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  max-width: 880px;
  margin: 0 auto 56px;
}
.t-stat {
  text-align: center;
  padding: 20px 14px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}
.t-stat-num {
  font-size: clamp(24px, 3.4vw, 34px);
  font-weight: 800;
  letter-spacing: -1px;
  background: linear-gradient(135deg, #7c3aed, #a855f7);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.t-stat-num span {
  font-size: 0.5em;
  font-weight: 700;
  -webkit-text-fill-color: var(--muted);
}
.t-stat-label {
  font-size: 12px;
  color: var(--muted);
  font-weight: 500;
  margin-top: 4px;
}

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.testimonial-card {
  position: relative;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 26px;
  display: flex; flex-direction: column;
  gap: 18px;
  transition: border-color .2s, box-shadow .2s, transform .2s;
  box-shadow: var(--shadow-sm);
}
.testimonial-card:hover {
  border-color: #c4b5fd;
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.testimonial-featured {
  grid-column: span 2;
  background: linear-gradient(135deg, #ffffff 0%, #faf5ff 100%);
  border-color: #ddd6fe;
}
.testimonial-featured .t-quote {
  font-size: 18px;
  line-height: 1.65;
}
.t-stars {
  color: #f59e0b;
  font-size: 16px;
  letter-spacing: 2px;
}
.t-quote {
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-soft);
  flex: 1;
  margin: 0;
}
.t-quote strong { color: var(--text); font-weight: 700; }
.t-person {
  display: flex; align-items: center; gap: 12px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}
.t-avatar {
  width: 44px; height: 44px;
  border-radius: 50%;
  display: grid; place-items: center;
  color: #fff;
  font-weight: 700;
  font-size: 15px;
  letter-spacing: -0.3px;
  flex-shrink: 0;
}
.t-avatar-1 { background: linear-gradient(135deg, #7c3aed, #6d28d9); }
.t-avatar-2 { background: linear-gradient(135deg, #ec4899, #be185d); }
.t-avatar-3 { background: linear-gradient(135deg, #10b981, #047857); }
.t-avatar-4 { background: linear-gradient(135deg, #f97316, #c2410c); }
.t-avatar-5 { background: linear-gradient(135deg, #06b6d4, #0e7490); }
.t-avatar-6 { background: linear-gradient(135deg, #6366f1, #4338ca); }
.t-person-info { display: flex; flex-direction: column; min-width: 0; }
.t-person-info strong {
  font-size: 14px;
  font-weight: 700;
  color: var(--text);
}
.t-person-info span {
  font-size: 12px;
  color: var(--muted);
}

@media (max-width: 900px) {
  .testimonials-row { grid-template-columns: repeat(2, 1fr); max-width: 100%; }
  .testimonials-grid { grid-template-columns: repeat(2, 1fr); }
  .testimonial-featured { grid-column: span 2; }
}
@media (max-width: 600px) {
  .testimonials-grid { grid-template-columns: 1fr; }
  .testimonial-featured { grid-column: span 1; }
  .testimonial-featured .t-quote { font-size: 16px; }
}

/* ── FAQ ─────────────────────────────────── */
.faq-list {
  display: flex; flex-direction: column;
  gap: 12px;
  margin-top: 16px;
}
.faq-link {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
  border-bottom: 1px solid var(--accent-soft);
  transition: border-color .2s;
}
.faq-link:hover { border-color: var(--accent); }

.faq-item {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color .2s, box-shadow .2s;
}
.faq-item:hover {
  border-color: #c4b5fd;
}
.faq-item[open] {
  border-color: #c4b5fd;
  box-shadow: var(--shadow-md);
  background: linear-gradient(180deg, #ffffff 0%, #fdfcff 100%);
}
.faq-item summary {
  list-style: none;
  cursor: pointer;
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px;
  padding: 20px 24px;
  font-weight: 600;
  color: var(--text);
  font-size: 16px;
  transition: color .2s;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary:hover { color: var(--accent); }
.faq-item[open] summary { color: var(--accent); }

.faq-q { flex: 1; line-height: 1.4; }

.faq-icon {
  width: 28px; height: 28px;
  flex-shrink: 0;
  border: 1px solid var(--border);
  border-radius: 50%;
  position: relative;
  transition: background .2s, border-color .2s, transform .3s;
  background: var(--bg-soft);
}
.faq-icon::before,
.faq-icon::after {
  content: '';
  position: absolute;
  top: 50%; left: 50%;
  background: var(--text-soft);
  border-radius: 1px;
  transition: background .2s, transform .3s;
}
.faq-icon::before {
  width: 12px; height: 2px;
  transform: translate(-50%, -50%);
}
.faq-icon::after {
  width: 2px; height: 12px;
  transform: translate(-50%, -50%);
}
.faq-item:hover .faq-icon {
  border-color: var(--accent);
  background: var(--accent-soft);
}
.faq-item:hover .faq-icon::before,
.faq-item:hover .faq-icon::after { background: var(--accent); }

.faq-item[open] .faq-icon {
  background: var(--accent);
  border-color: var(--accent);
  transform: rotate(180deg);
}
.faq-item[open] .faq-icon::before { background: #fff; }
.faq-item[open] .faq-icon::after { transform: translate(-50%, -50%) rotate(90deg); background: #fff; opacity: 0; }

.faq-a {
  padding: 0 24px 22px;
  animation: faq-slide .3s ease-out;
}
@keyframes faq-slide {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}
.faq-a p {
  font-size: 15px;
  line-height: 1.7;
  color: var(--muted);
}
.faq-a p strong { color: var(--text); font-weight: 700; }
.faq-a a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
  border-bottom: 1px dashed var(--accent);
}
.faq-bullets {
  list-style: none;
  display: flex; flex-direction: column;
  gap: 8px;
}
.faq-bullets li {
  font-size: 15px;
  line-height: 1.6;
  color: var(--muted);
  padding-left: 22px;
  position: relative;
}
.faq-bullets li::before {
  content: '';
  position: absolute;
  left: 4px; top: 10px;
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent);
}
.faq-bullets strong { color: var(--text); font-weight: 700; }

@media (max-width: 640px) {
  .faq-item summary { padding: 16px 18px; font-size: 15px; }
  .faq-a { padding: 0 18px 18px; }
}


/* ── NAV RIGHT (toggle + button) ──────────── */
.nav-right { display: flex; align-items: center; gap: 12px; }
.theme-toggle {
  width: 36px; height: 36px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--bg-soft);
  color: var(--text-soft);
  cursor: pointer;
  display: grid; place-items: center;
  position: relative;
  transition: background .2s, border-color .2s, color .2s;
}
.theme-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-soft);
}
.theme-toggle svg {
  width: 18px; height: 18px;
  position: absolute;
  transition: opacity .25s, transform .35s;
}
.theme-toggle .theme-icon-moon { opacity: 0; transform: rotate(-90deg) scale(.6); }
[data-theme="dark"] .theme-toggle .theme-icon-sun { opacity: 0; transform: rotate(90deg) scale(.6); }
[data-theme="dark"] .theme-toggle .theme-icon-moon { opacity: 1; transform: rotate(0) scale(1); }