/* AI Waiter Landing Page — mobile-first, no external dependencies */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:        #FFF9F0;
  --surface:   #FFFFFF;
  --surface-2: #F5F3EF;
  --green:     #0E9F6E;
  --green-dk:  #0a7d57;
  --orange:    #E85D04;
  --zalo:      #0068FF;
  --zalo-dk:   #0052CC;
  --telegram:  #229ED9;
  --text:      #1C1C1E;
  --text-2:    #555557;
  --text-3:    #888;
  --border:    #E8E4DC;
  --shadow-sm: 0 2px 8px rgba(0,0,0,.07);
  --shadow-md: 0 6px 24px rgba(0,0,0,.10);
  --r-sm: 12px;
  --r-md: 16px;
  --r-lg: 24px;
}

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* ── Layout helpers ── */
.container {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
}

section { padding: 72px 0; }

/* ── Navbar ── */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,249,240,.92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  padding: 14px 0;
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}
.nav-right {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: flex-end;
}
.site-lang-switcher {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}
.site-lang-btn {
  font-size: .72rem;
  font-weight: 700;
  padding: 5px 9px;
  border-radius: 99px;
  border: 1.5px solid var(--border);
  background: var(--surface);
  color: var(--text-2);
  cursor: pointer;
  transition: all .12s;
  -webkit-tap-highlight-color: transparent;
}
.site-lang-btn:hover { border-color: #ccc; color: var(--text); }
.site-lang-btn.active {
  background: var(--green);
  border-color: var(--green);
  color: #fff;
}
.nav-brand {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -.01em;
}
.nav-brand span { color: var(--green); }
.nav-cta {
  background: var(--green);
  color: #fff;
  padding: 9px 18px;
  border-radius: var(--r-sm);
  text-decoration: none;
  font-weight: 600;
  font-size: .875rem;
  transition: background .15s;
  white-space: nowrap;
}
.nav-cta:hover { background: var(--green-dk); }

/* ── Hero ── */
.hero {
  padding: 80px 0 64px;
}
.hero-inner {
  display: flex;
  flex-direction: column;
  gap: 56px;
  align-items: center;
}
.hero-text { text-align: center; max-width: 680px; }
.hero-micro {
  display: inline-block;
  background: #e8f7f0;
  color: var(--green);
  font-size: .78rem;
  font-weight: 600;
  letter-spacing: .06em;
  text-transform: uppercase;
  padding: 5px 12px;
  border-radius: 99px;
  margin-bottom: 20px;
}
.hero-title {
  font-size: clamp(1.75rem, 5vw, 2.8rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -.02em;
  color: var(--text);
  margin-bottom: 20px;
}
.hero-title em { color: var(--green); font-style: normal; }
.hero-sub {
  font-size: 1.05rem;
  color: var(--text-2);
  line-height: 1.65;
  max-width: 540px;
  margin: 0 auto 32px;
}
.hero-buttons {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
  margin-bottom: 24px;
}
.hero-trust {
  display: inline-block;
  font-size: .82rem;
  font-weight: 600;
  color: var(--text-2);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 99px;
  padding: 7px 14px;
  margin: 0;
}
.hero-trust-area {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  margin-top: 4px;
}
.hero-credibility {
  font-size: .8rem;
  color: var(--text-3);
  margin: 0;
  max-width: 420px;
  line-height: 1.45;
}
.hero-contact {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
}
.hero-contact-label {
  font-size: .82rem;
  color: var(--text-2);
  font-weight: 600;
}
.contact-links {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
}
.contact-links-center { margin-top: 12px; }
.contact-row {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  justify-content: center;
}
.contact-row-center { margin-top: 12px; }
.zalo-contact {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  background: #e8f0ff;
  border: 1.5px solid rgba(0, 104, 255, .28);
  border-radius: var(--r-md);
}
.zalo-qr {
  display: block;
  width: 80px;
  height: 80px;
  border-radius: 6px;
  flex-shrink: 0;
  background: #fff;
}
.zalo-contact-meta {
  display: flex;
  flex-direction: column;
  gap: 2px;
  text-align: left;
  min-width: 0;
}
.zalo-contact-title {
  font-size: .82rem;
  font-weight: 800;
  color: var(--zalo-dk);
  letter-spacing: .02em;
}
.zalo-contact-hint {
  font-size: .72rem;
  color: var(--text-2);
  line-height: 1.35;
  max-width: 140px;
}
.zalo-contact-phone {
  font-size: .78rem;
  font-weight: 700;
  color: var(--zalo-dk);
  letter-spacing: .02em;
}
.contact-sep {
  color: var(--text-3);
  font-size: .85rem;
  user-select: none;
}
.contact-pill {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: .78rem;
  font-weight: 700;
  padding: 6px 14px 6px 10px;
  border-radius: 99px;
  text-decoration: none;
  transition: opacity .15s, transform .1s;
  border: 1.5px solid transparent;
}
.contact-icon {
  display: block;
  width: 16px;
  height: 16px;
  flex: 0 0 auto;
  object-fit: contain;
}
.contact-pill .contact-icon {
  width: 18px;
  height: 18px;
}
.contact-icon-zalo {
  border-radius: 50%;
}
.contact-pill:hover { opacity: .88; transform: translateY(-1px); }
.contact-pill-tg {
  background: #e8f4fc;
  color: #1565a8;
  border-color: rgba(34, 158, 217, .35);
}
.contact-pill-zalo {
  background: #e8f0ff;
  color: var(--zalo-dk);
  border-color: rgba(0, 104, 255, .3);
}
.btn-primary {
  background: var(--green);
  color: #fff;
  padding: 14px 28px;
  border-radius: var(--r-md);
  text-decoration: none;
  font-weight: 700;
  font-size: 1rem;
  transition: background .15s, transform .1s;
  display: inline-block;
}
.btn-primary:hover { background: var(--green-dk); transform: translateY(-1px); }
.btn-secondary {
  background: var(--surface);
  color: var(--text);
  padding: 14px 28px;
  border-radius: var(--r-md);
  text-decoration: none;
  font-weight: 600;
  font-size: 1rem;
  border: 1.5px solid var(--border);
  transition: border-color .15s, transform .1s;
  display: inline-block;
}
.btn-secondary:hover { border-color: #ccc; transform: translateY(-1px); }

/* ── Hero mockups ── */
.hero-visual {
  width: 100%;
  display: flex;
  justify-content: center;
  overflow: visible;
}
.hero-mockups {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  justify-content: center;
  align-items: flex-start;
  width: 100%;
  max-width: 510px;
  margin: 0 auto;
  overflow: visible;
}

/* Phone mockup */
.phone-frame {
  background: #2a2a2c;
  border-radius: 36px;
  padding: 10px 8px 12px;
  box-shadow: var(--shadow-md), inset 0 0 0 1px rgba(255,255,255,.06);
  flex-shrink: 0;
}
.phone-notch {
  width: 64px;
  height: 5px;
  background: #1a1a1c;
  border-radius: 99px;
  margin: 0 auto 8px;
}
.phone-mockup {
  background: var(--surface);
  border-radius: 24px;
  padding: 14px 14px 16px;
  width: 210px;
  max-width: 100%;
  border: 1.5px solid rgba(0,0,0,.08);
  overflow: hidden;
}
.phone-status-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
  opacity: .55;
  font-size: .65rem;
  font-weight: 600;
}
.phone-menu-title {
  font-size: .7rem;
  font-weight: 700;
  color: var(--text-3);
  letter-spacing: .04em;
  text-transform: uppercase;
  margin-bottom: 4px;
}
.phone-restaurant {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 14px;
}
.lang-switcher {
  display: flex;
  gap: 6px;
  margin-bottom: 14px;
  flex-wrap: wrap;
}
.lang-btn {
  font-size: .72rem;
  font-weight: 600;
  padding: 4px 9px;
  border-radius: 99px;
  border: 1.5px solid var(--border);
  background: var(--surface-2);
  color: var(--text-2);
  cursor: pointer;
  transition: all .12s;
  -webkit-tap-highlight-color: transparent;
}
.lang-btn.active {
  background: var(--green);
  border-color: var(--green);
  color: #fff;
}
.dish-card {
  background: var(--surface-2);
  border-radius: var(--r-sm);
  padding: 10px;
  margin-bottom: 8px;
}
.dish-name {
  font-size: .82rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 2px;
}
.dish-desc {
  font-size: .72rem;
  color: var(--text-3);
  margin-bottom: 6px;
  line-height: 1.4;
}
.dish-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.dish-price {
  font-size: .82rem;
  font-weight: 700;
  color: var(--orange);
}
.dish-add-btn {
  background: var(--green);
  color: #fff;
  border: none;
  border-radius: 99px;
  font-size: .7rem;
  font-weight: 700;
  padding: 4px 12px;
  cursor: pointer;
}
.phone-order-bar {
  background: var(--green);
  color: #fff;
  border-radius: var(--r-sm);
  padding: 10px 12px;
  font-size: .8rem;
  font-weight: 700;
  text-align: center;
  margin-top: 10px;
}

/* Zalo notification mockup */
.zalo-card {
  background: var(--surface);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-md);
  border: 1.5px solid var(--border);
  width: 250px;
  max-width: 100%;
  flex-shrink: 0;
  overflow: hidden;
}
.zalo-header {
  background: var(--zalo);
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.zalo-icon {
  background: #fff;
  border-radius: 8px;
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: .8rem;
  font-weight: 900;
  color: var(--zalo);
  flex-shrink: 0;
}
.zalo-header-text { flex: 1; }
.zalo-app-name {
  font-size: .7rem;
  color: rgba(255,255,255,.7);
  font-weight: 600;
}
.zalo-oa-name {
  font-size: .82rem;
  color: #fff;
  font-weight: 700;
}
.zalo-time {
  font-size: .65rem;
  color: rgba(255,255,255,.6);
}
.zalo-body { padding: 16px; }
.zalo-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background: #fff3cd;
  border: 1.5px solid #ffc107;
  color: #856404;
  font-size: .7rem;
  font-weight: 700;
  padding: 3px 9px;
  border-radius: 99px;
  margin-bottom: 10px;
}
.zalo-order-title {
  font-size: 1rem;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 12px;
}
.zalo-items { margin-bottom: 12px; }
.zalo-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 5px 0;
  border-bottom: 1px solid var(--border);
  font-size: .82rem;
  color: var(--text);
}
.zalo-item:last-child { border-bottom: none; }
.zalo-item-qty {
  font-weight: 700;
  color: var(--green);
  margin-right: 6px;
  min-width: 26px;
}
.zalo-note {
  background: #f0f7ff;
  border-left: 3px solid var(--zalo);
  border-radius: 0 8px 8px 0;
  padding: 8px 10px;
  font-size: .75rem;
  color: var(--text-2);
  margin-top: 10px;
}
.zalo-note strong { color: var(--zalo); display: block; font-size: .65rem; text-transform: uppercase; letter-spacing: .04em; margin-bottom: 2px; }

/* ── Section headers ── */
.section-label {
  font-size: .75rem;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--green);
  margin-bottom: 10px;
}
.section-title {
  font-size: clamp(1.5rem, 4vw, 2.1rem);
  font-weight: 800;
  letter-spacing: -.02em;
  color: var(--text);
  margin-bottom: 14px;
}
.section-sub {
  font-size: 1rem;
  color: var(--text-2);
  max-width: 560px;
  line-height: 1.65;
}

/* ── How it works ── */
#how-it-works { background: var(--surface); }
.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 24px;
  margin-top: 40px;
}
.step-card {
  background: var(--bg);
  border-radius: var(--r-lg);
  padding: 28px 24px;
  border: 1.5px solid var(--border);
}
.step-num {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--green);
  color: #fff;
  font-weight: 800;
  font-size: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 14px;
}
.step-title {
  font-size: .95rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 6px;
}
.step-desc {
  font-size: .875rem;
  color: var(--text-2);
  line-height: 1.6;
}
.steps-note {
  margin-top: 32px;
  background: #e8f7f0;
  border-radius: var(--r-md);
  padding: 16px 20px;
  font-size: .9rem;
  color: var(--text-2);
  border-left: 3px solid var(--green);
}
.steps-note strong { color: var(--text); }

/* ── QR table cards (pilot setup) ── */
.table-cards-section {
  background: var(--surface-2);
}
.table-cards-sub {
  max-width: 640px;
}
.table-cards-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 36px;
}
.table-card {
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--r-md);
  padding: 22px 20px;
  box-shadow: var(--shadow-sm);
}
.table-card-title {
  font-size: .95rem;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 8px;
  line-height: 1.35;
}
.table-card-desc {
  font-size: .875rem;
  color: var(--text-2);
  line-height: 1.55;
}
.table-card-cta {
  margin-top: 36px;
  text-align: center;
  padding-top: 28px;
  border-top: 1px solid var(--border);
}
.table-card-cta-text {
  font-size: .92rem;
  color: var(--text-2);
  margin-bottom: 4px;
  line-height: 1.5;
}

@media (min-width: 720px) {
  .table-cards-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ── Before / After ── */
.before-after-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-top: 40px;
  align-items: stretch;
}
.ba-card {
  border-radius: var(--r-lg);
  padding: 28px 24px;
  border: 1.5px solid var(--border);
  display: flex;
  flex-direction: column;
}
.ba-card.before { background: var(--surface-2); }
.ba-card.after  { background: #e8f7f0; border-color: #b2dfcf; }
.ba-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: .92rem;
  font-weight: 800;
  letter-spacing: -.01em;
  margin-bottom: 14px;
  color: var(--text);
}
.ba-marker {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.35rem;
  height: 1.35rem;
  border-radius: 50%;
  font-size: .72rem;
  font-weight: 800;
  flex-shrink: 0;
  line-height: 1;
}
.ba-marker-neg {
  background: #fce8e8;
  color: #b42318;
}
.ba-marker-pos {
  background: #e8f7f0;
  color: var(--green);
}
.ba-card.before .ba-label { color: var(--text-2); }
.ba-card.after  .ba-label { color: var(--text); }
.ba-title {
  font-size: 1rem;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 16px;
}
.ba-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 9px;
}
.ba-list li {
  display: flex;
  align-items: flex-start;
  gap: 9px;
  font-size: .875rem;
  color: var(--text-2);
  line-height: 1.5;
}
.ba-list li::before {
  content: '–';
  flex-shrink: 0;
  margin-top: 1px;
}
.ba-card.before .ba-list li::before { color: var(--text-3); }
.ba-card.after  .ba-list li::before { content: '✓'; color: var(--green); font-weight: 700; }
.ba-card.after  .ba-list li { color: var(--text); }

/* ── What already works ── */
#what-works { background: var(--surface); }
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
  margin-top: 40px;
}
.feature-chip {
  background: var(--bg);
  border: 1.5px solid var(--border);
  border-radius: var(--r-md);
  padding: 16px 18px;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  color: var(--text);
}
.feature-chip-body {
  flex: 1;
  min-width: 0;
}
.feature-chip-title {
  font-size: .875rem;
  font-weight: 700;
  line-height: 1.35;
  color: var(--text);
}
.feature-chip-desc {
  font-size: .78rem;
  font-weight: 400;
  color: var(--text-3);
  line-height: 1.45;
  margin: 4px 0 0;
}
.feature-chip .chip-icon {
  flex-shrink: 0;
  width: 1.35rem;
  text-align: center;
  font-size: 1rem;
  line-height: 1;
  margin-top: 2px;
}
.feature-chip .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--green);
  flex-shrink: 0;
}

/* ── Demo section ── */
#demo { background: var(--bg); }
.demo-card {
  background: var(--surface);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-md);
  padding: 48px 40px;
  max-width: 600px;
  margin: 40px auto 0;
  text-align: center;
  border: 1.5px solid var(--border);
}
.demo-card .section-title { margin-bottom: 12px; }
.demo-card p {
  color: var(--text-2);
  font-size: .95rem;
  margin-bottom: 8px;
}
.demo-source {
  font-size: .82rem;
  color: var(--text-3);
  margin-bottom: 28px !important;
}
.demo-card .btn-primary {
  font-size: 1.05rem;
  padding: 16px 36px;
}
.demo-label-center { text-align: center; }
.demo-contact {
  margin-top: 20px;
  font-size: .9rem;
  color: var(--text-2);
  line-height: 1.5;
}

/* ── Footer ── */
footer {
  background: var(--text);
  color: rgba(255,255,255,.55);
  padding: 36px 0;
  font-size: .85rem;
}
footer .container {
  display: flex;
  flex-direction: column;
  gap: 6px;
  align-items: center;
  text-align: center;
}
footer strong { color: rgba(255,255,255,.85); }
.footer-contact {
  margin-top: 4px;
}
.footer-contact-link {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  color: rgba(255,255,255,.75);
  text-decoration: none;
  font-weight: 600;
}
.footer-contact-link:hover { color: #fff; text-decoration: underline; }
.footer-contact-zalo { color: #7eb8ff; }

/* ── Divider ── */
.divider {
  height: 1px;
  background: var(--border);
  border: none;
  margin: 0;
}

/* ── Responsive ── */
@media (min-width: 560px) {
  .hero-mockups {
    flex-wrap: nowrap;
    width: fit-content;
    max-width: calc(100vw - 40px);
  }
}

@media (max-width: 560px) {
  .before-after-grid {
    grid-template-columns: 1fr;
  }
  .nav-inner { justify-content: center; }
  .nav-right { justify-content: center; width: 100%; }
  .site-lang-switcher { justify-content: center; }
  .hero-mockups {
    flex-direction: column;
    align-items: center;
    max-width: 280px;
  }
  .phone-frame,
  .zalo-card {
    width: 100%;
    max-width: 280px;
  }
  .phone-mockup { width: 100%; }
  .demo-card { padding: 32px 20px; }
}