/* =========================================================
   PosAI Shop – Landing Page Styles
   Tông màu tham khảo 118.vn (đỏ - cam "nóng hổi") kết hợp
   xanh VietQR/BlueCom (#1A56DB) cho khối thanh toán & bảo mật.
   ========================================================= */

:root {
  --color-primary: #FF4B2B;
  --color-primary-dark: #D8330F;
  --color-primary-light: #FF7A45;
  --color-accent: #1A56DB;
  --color-accent-dark: #123F9E;
  --color-accent-light: #E8EFFF;

  --color-ink: #101828;
  --color-ink-soft: #475467;
  --color-border: #E4E7EC;

  --bg-warm: #FFF6F3;
  --bg-blue: #F5F8FF;

  --radius-lg: 20px;
  --radius-md: 14px;
  --radius-sm: 10px;

  --shadow-md: 0 8px 24px rgba(16, 24, 40, 0.08);
  --shadow-lg: 0 20px 48px rgba(16, 24, 40, 0.12);

  --font-body: 'Be Vietnam Pro', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --font-body-zh: 'Noto Sans SC', 'Be Vietnam Pro', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
}

html[lang="zh-CN"] body { font-family: var(--font-body-zh); }

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--color-ink);
  background: #fff;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; margin: 0; padding: 0; }

.container {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px;
}

h1, h2, h3, h4 { font-weight: 700; line-height: 1.2; margin: 0 0 12px; }
h1 { font-size: clamp(32px, 5vw, 52px); font-weight: 800; }
h2 { font-size: clamp(26px, 3.6vw, 38px); }
h3 { font-size: 20px; }
h4 { font-size: 17px; }
p { margin: 0 0 12px; color: var(--color-ink-soft); }

/* ---------- Buttons ---------- */
.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: 2px solid transparent;
  cursor: pointer;
  transition: transform .15s ease, box-shadow .15s ease, background .15s ease, color .15s ease;
  white-space: nowrap;
}
.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  color: #fff;
  box-shadow: 0 8px 20px rgba(255, 75, 43, 0.3);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 26px rgba(255, 75, 43, 0.4); }
.btn-outline {
  background: #fff;
  color: var(--color-ink);
  border-color: var(--color-border);
}
.btn-outline:hover { border-color: var(--color-primary); color: var(--color-primary); }
.btn-ghost {
  background: transparent;
  color: var(--color-ink);
  padding: 10px 16px;
}
.btn-ghost:hover { color: var(--color-primary); }
.btn-lg { padding: 15px 28px; font-size: 16px; }
.btn-block { width: 100%; }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding-top: 14px;
  padding-bottom: 14px;
}
.brand { display: flex; flex-direction: column; line-height: 1.1; }
.brand-mark { font-size: 22px; font-weight: 800; color: var(--color-ink); }
.brand-mark em { font-style: normal; color: var(--color-primary); }
.brand-sub { font-size: 11px; color: var(--color-ink-soft); font-weight: 500; }

.main-nav { display: flex; gap: 26px; }
.main-nav a { font-size: 15px; font-weight: 500; color: var(--color-ink-soft); }
.main-nav a:hover { color: var(--color-primary); }

.header-cta { display: flex; align-items: center; gap: 10px; }

/* ---------- Language switcher ---------- */
.lang-switch {
  display: flex;
  align-items: center;
  gap: 2px;
  background: var(--bg-blue);
  border-radius: 999px;
  padding: 3px;
}
.lang-btn {
  border: none;
  background: transparent;
  color: var(--color-ink-soft);
  font-weight: 700;
  font-size: 12px;
  padding: 6px 11px;
  border-radius: 999px;
  cursor: pointer;
  transition: background .15s ease, color .15s ease;
  white-space: nowrap;
}
.lang-btn:hover { color: var(--color-accent-dark); }
.lang-btn.active {
  background: var(--color-accent);
  color: #fff;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}
.nav-toggle span { width: 24px; height: 2px; background: var(--color-ink); border-radius: 2px; }

/* ---------- Hero ---------- */
.hero {
  background: radial-gradient(ellipse at top right, var(--bg-warm), #fff 60%);
  padding: 64px 0 40px;
  overflow: hidden;
}
.hero-inner {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}
.eyebrow {
  display: inline-block;
  background: var(--bg-warm);
  color: var(--color-primary-dark);
  font-weight: 700;
  font-size: 13px;
  padding: 6px 14px;
  border-radius: 999px;
  margin-bottom: 16px;
}
.highlight { color: var(--color-primary); }
.hero-desc { font-size: 17px; max-width: 560px; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin: 22px 0 28px; }

.hero-trust span:first-child { display: block; font-size: 13px; color: var(--color-ink-soft); margin-bottom: 10px; }
.trust-logos { display: flex; gap: 14px; flex-wrap: wrap; }
.trust-logos span {
  font-weight: 700;
  font-size: 13px;
  color: var(--color-accent-dark);
  background: var(--color-accent-light);
  padding: 6px 12px;
  border-radius: 8px;
}

/* Hero visual mock devices */
.hero-visual { position: relative; min-height: 380px; }
.device {
  position: absolute;
  background: #fff;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-border);
  padding: 16px;
}
.device-badge { font-weight: 700; font-size: 13px; margin-bottom: 10px; }
.device-kiosk { top: 0; right: 0; width: 260px; z-index: 3; }
.device-phone { bottom: 20px; left: 0; width: 220px; z-index: 2; background: var(--bg-blue); }
.device-web { top: 130px; left: 60px; width: 150px; height: 90px; z-index: 1; background: linear-gradient(135deg, var(--color-accent), var(--color-accent-dark)); }
.device-web .device-badge { color: #fff; }

.mock-card {
  display: flex; justify-content: space-between; align-items: center;
  background: var(--bg-warm); border-radius: 10px; padding: 8px 10px;
  font-size: 13px; font-weight: 600; margin-bottom: 8px;
}
.mock-card span { color: var(--color-primary-dark); }
.mock-highlight { background: var(--color-accent-light); color: var(--color-accent-dark); justify-content: center; }
.mock-order {
  display: flex; justify-content: space-between; align-items: center;
  background: #fff; border: 1px solid var(--color-border); border-radius: 10px;
  padding: 8px 10px; font-size: 12px; font-weight: 600; margin-bottom: 8px;
}
.tag { background: #DCFCE7; color: #15803D; font-size: 11px; padding: 3px 8px; border-radius: 999px; }
.tag-blue { background: var(--color-accent-light); color: var(--color-accent-dark); }

/* ---------- Stats ---------- */
.stats {
  background: linear-gradient(135deg, var(--color-accent-dark), var(--color-accent));
  padding: 36px 0;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  text-align: center;
  color: #fff;
}
.stat strong { display: block; font-size: 28px; font-weight: 800; }
.stat span { font-size: 13px; opacity: .85; }

/* ---------- Sections ---------- */
.section { padding: 76px 0; }
.section-alt { background: var(--bg-warm); }
.section-eyebrow {
  color: var(--color-primary-dark);
  font-weight: 700;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: .06em;
  margin-bottom: 8px;
}
.section-desc { max-width: 640px; font-size: 16px; }

.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-top: 32px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-top: 32px; }

.card, .feature-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 26px;
  transition: transform .15s ease, box-shadow .15s ease;
}
.card:hover, .feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.card-icon, .feature-icon { font-size: 30px; margin-bottom: 14px; }
.feature-card { text-align: left; }
.device-card { background: var(--bg-blue); border-color: transparent; }

/* Order flow (meituan-style steps) */
.order-flow {
  display: flex;
  align-items: stretch;
  gap: 12px;
  margin-top: 36px;
  flex-wrap: wrap;
}
.flow-step {
  flex: 1 1 200px;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 22px;
  text-align: center;
}
.flow-icon { font-size: 28px; margin-bottom: 10px; }
.flow-step p { font-size: 14px; margin: 0; }
.flow-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  color: var(--color-primary);
  font-weight: 700;
}

.callout {
  margin-top: 32px;
  display: flex;
  align-items: center;
  gap: 20px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: #fff;
  border-radius: var(--radius-lg);
  padding: 26px 30px;
  flex-wrap: wrap;
}
.callout-icon { font-size: 36px; }
.callout h4 { margin-bottom: 4px; }
.callout p { color: rgba(255,255,255,0.9); margin: 0; }
.callout .btn-primary { background: #fff; color: var(--color-primary-dark); box-shadow: none; margin-left: auto; }
.callout .btn-primary:hover { background: #FFF1EC; }

/* Tags grid (ngành hàng) */
.tags-grid {
  display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px;
}
.tags-grid span {
  background: var(--bg-blue);
  color: var(--color-accent-dark);
  font-weight: 600;
  font-size: 14px;
  padding: 10px 16px;
  border-radius: 999px;
  border: 1px solid var(--color-border);
}

/* ---------- Contact ---------- */
.section-contact { background: linear-gradient(180deg, var(--bg-blue), #fff); }
.contact-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}
.contact-list { margin-top: 24px; display: flex; flex-direction: column; gap: 14px; }
.contact-list li { font-size: 15px; }
.contact-list a { color: var(--color-accent-dark); font-weight: 600; }
.contact-list a:hover { text-decoration: underline; }

.contact-form {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 30px;
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.contact-form h3 { margin-bottom: 6px; }
.contact-form label {
  display: flex; flex-direction: column; gap: 6px;
  font-size: 14px; font-weight: 600; color: var(--color-ink);
}
.contact-form input,
.contact-form select,
.contact-form textarea {
  font-family: inherit;
  font-size: 14px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background: #fafafa;
  outline: none;
  resize: vertical;
}
.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus {
  border-color: var(--color-primary);
  background: #fff;
}
.form-note { font-size: 12px; color: var(--color-ink-soft); text-align: center; margin: 0; }

/* ---------- Footer ---------- */
.site-footer {
  background: #0B1220;
  color: #CBD5E1;
  padding: 56px 0 20px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 32px;
}
.footer-brand { color: #fff; }
.site-footer h5 { color: #fff; font-size: 14px; margin-bottom: 14px; }
.site-footer p { color: #94A3B8; font-size: 13px; }
.footer-owner { margin-top: 14px; }
.site-footer div > a {
  display: block;
  font-size: 14px;
  color: #CBD5E1;
  margin-bottom: 10px;
}
.site-footer div > a:hover { color: var(--color-primary-light); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  margin-top: 36px;
  padding-top: 20px;
  font-size: 12px;
  color: #64748B;
}

/* ---------- Floating CTA ---------- */
.floating-cta {
  position: fixed;
  bottom: 22px;
  right: 22px;
  z-index: 90;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  color: #fff;
  padding: 14px 20px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 14px;
  box-shadow: 0 12px 28px rgba(255,75,43,0.4);
}

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .main-nav { display: none; }
  .nav-toggle { display: flex; }
  .hero-inner { grid-template-columns: 1fr; }
  .hero-visual { min-height: 320px; margin-top: 20px; }
  .contact-inner { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .grid-3 { grid-template-columns: 1fr; }
  .grid-4 { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .header-cta .btn-ghost { display: none; }
  .footer-grid { grid-template-columns: 1fr; }
  .flow-arrow { transform: rotate(90deg); }
  .callout { flex-direction: column; align-items: flex-start; }
  .callout .btn-primary { margin-left: 0; }
  .lang-btn { padding: 5px 8px; font-size: 11px; }
}

/* Mobile nav open state */
.main-nav.open {
  display: flex;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: #fff;
  flex-direction: column;
  padding: 16px 24px;
  border-bottom: 1px solid var(--color-border);
  gap: 14px;
}