:root {
  --zentro-primary: #2563ff;
  --zentro-primary-dark: #1237a9;
  --zentro-accent: #7c5cff;
  --zentro-background: #f7f9ff;
  --zentro-surface: #ffffff;
  --zentro-text: #111827;
  --zentro-muted: #5b6475;
  --zentro-border: #dce5f6;
  --zentro-radius-sm: 12px;
  --zentro-radius-md: 20px;
  --zentro-radius-lg: 32px;
  --zentro-shadow-soft: 0 24px 80px rgba(22, 49, 120, 0.14);
  --zentro-content-width: 1200px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--zentro-text);
  background: var(--zentro-background);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
  text-rendering: optimizeLegibility;
}

body.menu-open { overflow: hidden; }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button, input, select, textarea { font: inherit; }
button { cursor: pointer; }
:focus-visible { outline: 3px solid rgba(37, 99, 255, 0.42); outline-offset: 3px; }

.skip-link {
  position: absolute;
  left: 16px;
  top: -80px;
  z-index: 100;
  padding: 10px 14px;
  border-radius: var(--zentro-radius-sm);
  background: var(--zentro-text);
  color: #fff;
}
.skip-link:focus { top: 16px; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid rgba(220, 229, 246, 0.76);
  background: rgba(247, 249, 255, 0.86);
  backdrop-filter: blur(18px);
}
.nav-shell {
  width: min(100% - 40px, var(--zentro-content-width));
  min-height: 74px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 850;
  font-size: 20px;
  letter-spacing: 0;
}
.brand img {
  width: 40px;
  height: 40px;
  border-radius: 11px;
  box-shadow: 0 8px 24px rgba(37, 99, 255, 0.2);
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 26px;
  color: var(--zentro-muted);
  font-weight: 700;
}
.nav-links a[aria-current="page"], .nav-links a:hover { color: var(--zentro-primary-dark); }
.header-actions { display: flex; align-items: center; gap: 12px; }
.menu-button { display: none; }
.menu-lines {
  width: 20px;
  height: 14px;
  position: relative;
  display: block;
}
.menu-lines::before,
.menu-lines::after {
  content: "";
  position: absolute;
  left: 0;
  width: 20px;
  height: 2px;
  border-radius: 999px;
  background: #24324f;
  transform-origin: 50% 50%;
  transition:
    transform 280ms cubic-bezier(.2, .8, .2, 1),
    top 280ms cubic-bezier(.2, .8, .2, 1);
}
.menu-lines::before { top: 1px; }
.menu-lines::after { top: 11px; }
.menu-button[aria-expanded="true"] .menu-lines::before { top: 6px; transform: rotate(45deg); }
.menu-button[aria-expanded="true"] .menu-lines::after { top: 6px; transform: rotate(-45deg); }

.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 0 20px;
  background: var(--zentro-primary);
  color: #fff;
  font-weight: 800;
  box-shadow: 0 14px 34px rgba(37, 99, 255, 0.28);
  transition: transform 180ms ease, box-shadow 180ms ease, background 180ms ease;
}
.button:hover { transform: translateY(-1px); box-shadow: 0 18px 42px rgba(37, 99, 255, 0.34); }
.button.secondary {
  background: #fff;
  color: var(--zentro-primary-dark);
  border-color: var(--zentro-border);
  box-shadow: none;
}
.button.small { min-height: 40px; padding: 0 16px; }

.section {
  width: min(100% - 40px, var(--zentro-content-width));
  margin: 0 auto;
  padding: 92px 0;
}
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(360px, 0.92fr);
  align-items: center;
  gap: 56px;
  padding-top: 74px;
}
.eyebrow {
  margin: 0 0 14px;
  color: var(--zentro-primary-dark);
  font-weight: 850;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-size: 13px;
}
h1, h2, h3 { margin: 0; line-height: 1.04; letter-spacing: 0; }
h1 { font-size: clamp(42px, 7vw, 82px); max-width: 820px; }
h2 { font-size: clamp(32px, 4.8vw, 56px); }
h3 { font-size: 24px; }
.lead {
  margin: 22px 0 0;
  max-width: 650px;
  color: var(--zentro-muted);
  font-size: clamp(18px, 2vw, 22px);
}
.hero-actions { margin-top: 34px; display: flex; flex-wrap: wrap; gap: 14px; }
.platforms { margin-top: 18px; color: var(--zentro-muted); font-weight: 700; }

.hero-visual {
  position: relative;
  min-height: 640px;
  display: grid;
  place-items: center;
}
.orb {
  position: absolute;
  inset: 50px 0 70px;
  border-radius: 48px;
  background:
    linear-gradient(145deg, rgba(37, 99, 255, 0.16), rgba(124, 92, 255, 0.14)),
    #eaf0ff;
  transform: rotate(-3deg);
}
.phone-stack { position: relative; width: min(100%, 520px); min-height: 590px; }
.phone {
  position: absolute;
  width: 252px;
  min-height: 520px;
  padding: 14px;
  border: 10px solid #111827;
  border-radius: 38px;
  background: #fdfefe;
  box-shadow: var(--zentro-shadow-soft);
  overflow: hidden;
}
.phone.primary { right: 18px; top: 24px; }
.phone.secondary { left: 14px; top: 92px; transform: rotate(-5deg); }
.phone.call { right: 126px; bottom: 0; width: 210px; min-height: 300px; transform: rotate(5deg); }
.phone-bar { width: 76px; height: 5px; margin: 0 auto 18px; border-radius: 999px; background: #d7deec; }
.chat-row, .message-line, .feature-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 4px;
}
.avatar {
  flex: 0 0 auto;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: #e6edff;
  color: var(--zentro-primary-dark);
  font-weight: 850;
}
.chat-copy strong, .chat-copy span { display: block; }
.chat-copy strong { font-size: 14px; }
.chat-copy span { color: var(--zentro-muted); font-size: 12px; }
.bubble {
  max-width: 82%;
  margin: 10px 0;
  padding: 10px 12px;
  border-radius: 16px;
  background: #eef4ff;
  font-weight: 650;
  font-size: 13px;
}
.bubble.me { margin-left: auto; background: var(--zentro-primary); color: #fff; }
.media-tile { height: 118px; border-radius: 20px; background: linear-gradient(135deg, #e8f0ff, #d9e2ff); margin: 12px 0; }
.call-card {
  min-height: 250px;
  border-radius: 28px;
  padding: 24px 16px;
  background: linear-gradient(160deg, var(--zentro-primary), var(--zentro-accent));
  color: #fff;
  text-align: center;
}
.call-avatar { width: 74px; height: 74px; margin: 14px auto; border-radius: 50%; background: rgba(255,255,255,.22); display: grid; place-items: center; font-size: 28px; font-weight: 850; }
.call-actions { display: flex; justify-content: center; gap: 14px; margin-top: 24px; }
.call-dot { width: 46px; height: 46px; border-radius: 50%; background: rgba(255,255,255,.25); display: grid; place-items: center; }

.trust-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  padding-top: 24px;
}
.trust-item, .card, .download-card, .support-card, .legal-card {
  border: 1px solid var(--zentro-border);
  border-radius: var(--zentro-radius-md);
  background: rgba(255,255,255,.82);
  box-shadow: 0 12px 40px rgba(28, 52, 112, 0.06);
}
.trust-item { padding: 18px; display: flex; gap: 12px; align-items: center; font-weight: 800; }
.icon {
  width: 40px;
  height: 40px;
  border-radius: 13px;
  display: grid;
  place-items: center;
  background: #eaf0ff;
  color: var(--zentro-primary-dark);
  font-weight: 900;
}

.section-intro { max-width: 720px; margin: 0 auto 44px; text-align: center; }
.section-intro p { color: var(--zentro-muted); font-size: 18px; }
.feature {
  display: grid;
  grid-template-columns: minmax(0, .95fr) minmax(320px, 1fr);
  gap: 52px;
  align-items: center;
  padding: 58px 0;
}
.feature:nth-of-type(even) .feature-visual { order: -1; }
.feature p, .card p, .support-card p, .legal-card p { color: var(--zentro-muted); }
.feature-visual {
  min-height: 330px;
  border-radius: var(--zentro-radius-lg);
  background: linear-gradient(145deg, #fff, #edf3ff);
  border: 1px solid var(--zentro-border);
  box-shadow: var(--zentro-shadow-soft);
  padding: 28px;
}
.mock-window { border-radius: 24px; background: #fff; padding: 20px; min-height: 280px; box-shadow: inset 0 0 0 1px var(--zentro-border); }

.privacy-section {
  margin-top: 60px;
  background:
    radial-gradient(circle at 18% 18%, rgba(37, 99, 255, 0.14), transparent 28%),
    linear-gradient(135deg, #eef4ff, #fbfcff 54%, #f3efff);
  border-block: 1px solid rgba(220, 229, 246, 0.9);
}
.privacy-section .section { padding: 76px 0; }
.privacy-grid { display: grid; grid-template-columns: .92fr 1.08fr; gap: 42px; align-items: center; }
.privacy-grid p { color: var(--zentro-muted); }
.privacy-panel {
  border: 1px solid rgba(183, 199, 237, 0.78);
  border-radius: var(--zentro-radius-lg);
  background: rgba(255,255,255,.72);
  box-shadow: 0 18px 60px rgba(35, 60, 140, 0.1);
  padding: 22px;
}
.privacy-principles {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.privacy-principles li {
  min-height: 104px;
  padding: 18px;
  border: 1px solid var(--zentro-border);
  border-radius: var(--zentro-radius-sm);
  background: #fff;
}
.privacy-principles strong { display: block; margin: 12px 0 4px; }
.privacy-principles span { color: var(--zentro-muted); font-size: 14px; }

.cards-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.card, .download-card, .support-card, .legal-card { padding: 24px; }
.download-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }
.download-strip {
  max-width: 760px;
  margin: 0 auto;
  text-align: center;
}
.store-row {
  display: flex;
  flex-wrap: nowrap;
  align-items: flex-start;
  justify-content: center;
  gap: 18px;
  margin-top: 28px;
}
.store-option {
  display: grid;
  justify-items: center;
  gap: 8px;
}
.store-link,
.store-disabled {
  width: 180px;
  height: 54px;
  display: inline-flex;
  border-radius: 11px;
  transition: transform 180ms ease, filter 180ms ease;
}
.store-link:hover { transform: translateY(-1px); filter: brightness(1.04); }
.store-disabled {
  opacity: .48;
  cursor: not-allowed;
  filter: grayscale(.2);
}
.store-badge-img {
  width: 180px;
  height: 54px;
}
.status { margin-top: 14px; color: var(--zentro-muted); font-weight: 750; }

.page-hero { padding: 74px 0 34px; text-align: center; }
.page-hero .lead { margin-left: auto; margin-right: auto; }
.legal-layout { display: grid; grid-template-columns: 280px 1fr; gap: 34px; align-items: start; }
.toc { position: sticky; top: 100px; padding: 18px; border: 1px solid var(--zentro-border); border-radius: var(--zentro-radius-md); background: #fff; }
.toc a { display: block; padding: 8px 0; color: var(--zentro-muted); font-weight: 700; }
.legal-card { display: grid; gap: 22px; }
.legal-card section { scroll-margin-top: 100px; }

.support-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.support-card ul { margin: 12px 0 0; padding-left: 20px; color: var(--zentro-muted); }
.contact-form { display: grid; gap: 14px; }
.input {
  width: 100%;
  min-height: 48px;
  border: 1px solid var(--zentro-border);
  border-radius: var(--zentro-radius-sm);
  padding: 12px 14px;
  background: #fff;
  color: var(--zentro-text);
}
textarea.input { min-height: 130px; resize: vertical; }

.site-footer {
  margin-top: 70px;
  padding: 46px 0 34px;
  border-top: 1px solid var(--zentro-border);
  background: #fff;
}
.footer-download {
  width: min(100% - 40px, var(--zentro-content-width));
  margin: 0 auto 26px;
  text-align: center;
}
.footer-download .store-row { margin-top: 0; }
.social-row {
  width: min(100% - 40px, var(--zentro-content-width));
  margin: 0 auto 30px;
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}
.social-link {
  width: 42px;
  height: 42px;
  display: inline-grid;
  place-items: center;
  border: 1px solid var(--zentro-border);
  border-radius: 50%;
  background: #f7f9ff;
  color: var(--zentro-primary-dark);
  transition: transform 180ms ease, background 180ms ease, border-color 180ms ease;
}
.social-link:hover {
  transform: translateY(-1px);
  background: #eef4ff;
  border-color: #b8c8ee;
}
.social-link svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
}
.footer-grid {
  width: min(100% - 40px, var(--zentro-content-width));
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.45fr repeat(3, 1fr);
  gap: 28px;
}
.footer-grid h2, .footer-grid h3 { font-size: 16px; margin-bottom: 12px; }
.footer-grid p, .footer-grid a { color: var(--zentro-muted); }
.footer-grid a { display: block; padding: 5px 0; font-weight: 650; }
.footer-bottom {
  width: min(100% - 40px, var(--zentro-content-width));
  margin: 36px auto 0;
  padding-top: 20px;
  border-top: 1px solid var(--zentro-border);
  color: var(--zentro-muted);
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.company-line {
  margin-top: 12px;
  color: var(--zentro-muted);
  font-weight: 750;
}

@media (prefers-reduced-motion: no-preference) {
  .reveal { opacity: 0; transform: translateY(18px); transition: opacity 500ms ease, transform 500ms ease; }
  .reveal.visible { opacity: 1; transform: translateY(0); }
  .phone.primary { animation: floatPhone 5.5s ease-in-out infinite; }
  @keyframes floatPhone {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
  }
}

@media (max-width: 920px) {
  .menu-button {
    display: inline-flex;
    width: 46px;
    height: 46px;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--zentro-border);
    border-radius: 14px;
    background: rgba(255,255,255,.72);
    box-shadow: 0 8px 24px rgba(22, 49, 120, 0.08);
  }
  .nav-links {
    position: fixed;
    inset: 74px 16px auto;
    display: none;
    padding: 18px;
    border: 1px solid var(--zentro-border);
    border-radius: var(--zentro-radius-md);
    background: #fff;
    box-shadow: var(--zentro-shadow-soft);
    gap: 14px;
  }
  .nav-links.open { display: grid; }
  .header-actions .button { display: none; }
  .hero, .feature, .privacy-grid, .legal-layout { grid-template-columns: 1fr; }
  .feature:nth-of-type(even) .feature-visual { order: 0; }
  .hero-visual { min-height: 560px; }
  .trust-strip, .cards-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .download-grid, .support-grid, .footer-grid { grid-template-columns: 1fr; }
  .toc { position: static; }
}

@media (max-width: 560px) {
  .nav-shell, .section, .footer-grid, .footer-bottom { width: min(100% - 28px, var(--zentro-content-width)); }
  .section { padding: 62px 0; }
  .hero { padding-top: 48px; gap: 30px; }
  .hero-actions { display: grid; }
  .store-row { gap: 10px; }
  .store-link, .store-disabled, .store-badge-img { width: min(142px, calc((100vw - 46px) / 2)); height: auto; }
  .privacy-principles { grid-template-columns: 1fr; }
  .trust-strip, .cards-grid { grid-template-columns: 1fr; }
  .phone-stack { min-height: 510px; }
  .phone { width: 220px; min-height: 460px; }
  .phone.secondary { left: 0; top: 80px; }
  .phone.primary { right: 0; }
  .phone.call { right: 76px; width: 190px; }
  .footer-bottom { display: block; }
}

@media (max-width: 340px) {
  .store-row { display: grid; justify-items: center; }
  .store-link, .store-disabled, .store-badge-img { width: 158px; }
}