:root {
  --ink: #111718;
  --orange: #ff5a00;
  --page-width: 1180px;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color-scheme: light;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  background: #eceeeb;
}

body {
  min-width: 320px;
  margin: 0;
  color: var(--ink);
  background: #eceeeb;
}

.site-header {
  min-height: 82px;
  padding: 11px clamp(18px, 4vw, 62px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, .97);
  border-bottom: 3px solid var(--orange);
  box-shadow: 0 5px 22px rgba(17, 23, 24, .1);
  backdrop-filter: blur(10px);
}

.brand {
  display: block;
  width: clamp(165px, 19vw, 265px);
  line-height: 0;
}

.brand img {
  width: 100%;
  height: auto;
  display: block;
}

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

.whatsapp-button {
  width: 48px;
  height: 48px;
  flex: 0 0 48px;
  border-radius: 8px;
  display: grid;
  place-items: center;
  color: #fff;
  background: #25d366;
  text-decoration: none;
  box-shadow: 0 4px 12px rgba(37, 211, 102, .2);
  transition: background .18s ease, transform .18s ease;
}

.whatsapp-button:hover {
  background: #1fb957;
  transform: translateY(-1px);
}

.whatsapp-button svg {
  width: 28px;
  height: 28px;
  fill: currentColor;
}

.siau-button {
  min-height: 48px;
  padding: 0 18px 0 22px;
  border-radius: 8px;
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: #fff;
  background: var(--ink);
  text-decoration: none;
  font-size: 14px;
  font-weight: 800;
  letter-spacing: .02em;
  white-space: nowrap;
  transition: background .18s ease, transform .18s ease;
}

.siau-button:hover {
  background: var(--orange);
  transform: translateY(-1px);
}

.siau-button:focus-visible,
.whatsapp-button:focus-visible,
.brand:focus-visible {
  outline: 3px solid rgba(255, 90, 0, .48);
  outline-offset: 3px;
}

.siau-button svg {
  width: 19px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2.2;
}

main {
  width: 100%;
  padding: clamp(18px, 3vw, 42px) clamp(12px, 4vw, 58px) clamp(26px, 5vw, 70px);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: clamp(18px, 3vw, 38px);
  background:
    radial-gradient(circle at 82% 6%, rgba(255, 90, 0, .08), transparent 28%),
    #eceeeb;
}

.presentation-page {
  width: min(var(--page-width), 100%);
  margin: 0;
  overflow: hidden;
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 15px 45px rgba(17, 23, 24, .13), 0 2px 5px rgba(17, 23, 24, .08);
}

.presentation-page img {
  width: 100%;
  height: auto;
  display: block;
}

@media (max-width: 720px) {
  .site-header {
    min-height: 64px;
    padding: 8px 12px;
    gap: 10px;
  }

  .brand { width: 142px; }

  .header-actions { gap: 6px; }

  .whatsapp-button {
    width: 41px;
    height: 41px;
    flex-basis: 41px;
    border-radius: 7px;
  }

  .whatsapp-button svg { width: 24px; height: 24px; }

  .siau-button {
    min-height: 41px;
    padding: 0 11px 0 13px;
    gap: 5px;
    border-radius: 7px;
    font-size: 11px;
  }

  .siau-button svg { width: 15px; }

  main {
    padding: 10px 8px 24px;
    gap: 10px;
    background: #dfe1df;
  }

  .presentation-page {
    width: 100%;
    border-radius: 3px;
    box-shadow: 0 3px 10px rgba(17, 23, 24, .12);
  }
}

@media (max-width: 380px) {
  .brand { width: 104px; }
  .site-header { padding-inline: 8px; }
  .siau-button { padding-inline: 9px; font-size: 10px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition-duration: .01ms !important; }
}