:root {
  color-scheme: light;
  --bg: #f4f1ea;
  --panel: rgba(255, 255, 255, 0.78);
  --panel-border: rgba(19, 39, 29, 0.08);
  --text: #171717;
  --button: #25d366;
  --button-hover: #20bd5a;
  --button-shadow: rgba(37, 211, 102, 0.28);
  --icon-green: #128c7e;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: "Nunito Sans", "Roboto", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(255, 255, 255, 0.88), transparent 38%),
    radial-gradient(circle at bottom right, rgba(37, 211, 102, 0.09), transparent 34%),
    linear-gradient(145deg, var(--bg), #faf8f3 52%, #ece7dd);
}

.page-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.panel {
  width: min(100%, 760px);
  padding: 56px 40px 42px;
  border: 1px solid var(--panel-border);
  border-radius: 36px;
  background: var(--panel);
  backdrop-filter: blur(18px);
  box-shadow:
    0 28px 80px rgba(24, 28, 23, 0.08),
    inset 0 1px 0 rgba(255, 255, 255, 0.78);
  text-align: center;
}

h1 {
  margin: 0;
  font-family: inherit;
  font-size: clamp(1.55rem, 3.7vw, 2.2rem);
  font-weight: 800;
  line-height: 0.98;
  letter-spacing: -0.04em;
  white-space: nowrap;
}

.whatsapp-button {
  margin: 30px auto 0;
  width: fit-content;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 12px 22px 12px 14px;
  border-radius: 999px;
  border: 1px solid rgba(18, 140, 126, 0.12);
  background: var(--button);
  color: #fff;
  font-size: 0.98rem;
  font-weight: 800;
  letter-spacing: -0.015em;
  text-decoration: none;
  box-shadow:
    0 16px 34px var(--button-shadow),
    inset 0 -1px 0 rgba(0, 0, 0, 0.08);
  transition:
    transform 180ms ease,
    box-shadow 180ms ease,
    background-color 180ms ease;
}

.whatsapp-button:hover {
  transform: translateY(-2px);
  background: var(--button-hover);
  box-shadow:
    0 20px 40px rgba(37, 211, 102, 0.34),
    inset 0 -1px 0 rgba(0, 0, 0, 0.1);
}

.whatsapp-button:focus-visible {
  outline: 3px solid rgba(37, 211, 102, 0.28);
  outline-offset: 5px;
}

.button-icon {
  width: 40px;
  height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: #fff;
  color: var(--icon-green);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.08);
}

.button-icon svg {
  width: 22px;
  height: 22px;
  fill: currentColor;
}

@media (max-width: 640px) {
  .panel {
    padding: 36px 16px 28px;
    border-radius: 28px;
  }

  h1 {
    font-size: clamp(1rem, 5vw, 1.38rem);
    letter-spacing: -0.03em;
  }

  .whatsapp-button {
    width: 100%;
    justify-content: center;
    gap: 10px;
    padding: 10px 14px 10px 12px;
    font-size: 0.84rem;
    letter-spacing: -0.01em;
  }

  .button-icon {
    width: 34px;
    height: 34px;
  }

  .button-icon svg {
    width: 19px;
    height: 19px;
  }
}