html, body { background: var(--bg); color: var(--text); }
body {
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  font-weight: 400;
  letter-spacing: -0.005em;
  overflow-x: hidden;
}
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.mono {
  font-family: var(--font-mono);
  font-size: var(--fs-mono-sm);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-muted);
}
.accent {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 400;
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  letter-spacing: -0.01em;
  padding-right: 0.05em;
}

/* ============== Buttons ============== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 22px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.9375rem;
  letter-spacing: -0.005em;
  transition: transform 0.4s var(--ease-out-expo),
              background 0.4s var(--ease-out-expo),
              border-color 0.4s var(--ease-out-expo),
              color 0.4s var(--ease-out-expo),
              box-shadow 0.4s var(--ease-out-expo);
  position: relative;
  will-change: transform;
}
.btn--primary {
  background: var(--teal);
  color: var(--bg);
  box-shadow: 0 8px 30px rgba(20,224,213,0.18);
}
.btn--primary:hover { background: #2BEFE3; box-shadow: 0 12px 40px rgba(20,224,213,0.28); }
.btn--ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--hairline-strong);
  backdrop-filter: blur(8px);
}
.btn--ghost:hover { border-color: rgba(20,224,213,0.5); color: var(--teal); }
.btn--full { width: 100%; padding: 16px 22px; }

.btn__spinner, .btn__check { display: none; }
.btn.is-loading .btn__label { opacity: 0; }
.btn.is-loading .btn__spinner {
  display: block;
  position: absolute;
  width: 16px; height: 16px;
  border: 2px solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
.btn.is-success { background: var(--teal); color: var(--bg); }
.btn.is-success .btn__label { opacity: 1; }
.btn.is-success .btn__check { display: inline-flex; }

@keyframes spin { to { transform: rotate(360deg); } }