* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family:
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    sans-serif;

  background:
    radial-gradient(
      circle at 50% 30%,
      #1a4971,
      #0E2F49
    );

  color: #e2e8f0;

  min-height: 100vh;

  display: flex;
  align-items: center;
  justify-content: center;

  text-align: center;

  padding: 1.5rem;
}

.card {
  background:
    rgba(255, 255, 255, 0.04);

  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);

  border:
    1px solid rgba(255, 255, 255, 0.1);

  border-radius: 16px;

  padding: 3rem 2rem;

  max-width: 440px;
  width: 100%;

  box-shadow:
    0 20px 40px rgba(0, 0, 0, 0.3);

  transition:
    all 0.3s ease;
}

h1 {
  font-size: 2rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 0.25rem;
  color: #ffffff;
}

h2 {
  font-size: 1.1rem;
  font-weight: 400;
  color: #94a3b8;
  margin-bottom: 1rem;
}

.badge {
  display: inline-block;

  padding: 0.25rem 0;

  font-family: inherit;
  font-size: 0.75rem;
  font-weight: 600;

  letter-spacing: 0.08em;
  text-transform: uppercase;

  color: #94a3b8;

  margin-bottom: 0.5rem;
}

.btn-toggle {
  margin-top: 0.5rem;

  background: rgba(255, 255, 255, 0.1);
  color: #ffffff;

  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 8px;

  padding: 0.65rem 1.25rem;

  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 600;

  cursor: pointer;

  transition:
    background 0.2s ease,
    transform 0.1s ease;
}

.btn-toggle:hover {
  background: rgba(255, 255, 255, 0.2);
}

.btn-toggle:active {
  transform: scale(0.98);
}

.btn-toggle:focus-visible,
.submit-btn:focus-visible,
.field input:focus-visible,
.field textarea:focus-visible {
  outline:
    2px solid #60a5fa;

  outline-offset: 2px;
}

.form-wrapper {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  margin-top: 0;
  text-align: left;

  transition:
    max-height 0.4s cubic-bezier(0, 1, 0, 1),
    opacity 0.3s ease,
    margin-top 0.3s ease;
}

.form-wrapper.open {
  max-height: 600px;
  opacity: 1;
  margin-top: 1.25rem;

  transition:
    max-height 0.5s ease-in-out,
    opacity 0.4s ease 0.1s,
    margin-top 0.3s ease;
}

.field {
  margin-bottom: 1rem;
}

.field label {
  display: block;

  font-size: 0.75rem;
  color: #cbd5e1;

  margin-bottom: 0.35rem;

  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.field input,
.field textarea {
  width: 100%;

  padding: 0.65rem 0.85rem;

  background: rgba(0, 0, 0, 0.25);

  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 6px;

  color: #ffffff;

  font-family: inherit;
  font-size: 0.9rem;

  outline: none;

  transition:
    border-color 0.2s ease;
}

.field input:focus,
.field textarea:focus {
  border-color: #60a5fa;
}

.field textarea {
  resize: vertical;
  min-height: 100px;
}

.submit-btn {
  width: 100%;

  background: #2563eb;
  color: #ffffff;

  border: none;
  border-radius: 6px;

  padding: 0.75rem;

  font-family: inherit;
  font-weight: 600;
  font-size: 0.9rem;

  cursor: pointer;

  margin-top: 0.5rem;

  transition:
    background 0.2s ease;
}

.submit-btn:hover {
  background: #1d4ed8;
}

.submit-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.hp {
  position: absolute;
  left: -10000px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.music-control {
  display: block;

  margin: 1rem auto 0;

  padding: 0.4rem 0.75rem;

  background: transparent;

  color: #94a3b8;

  border: none;

  font-family: inherit;

  font-size: 0.75rem;

  font-weight: 500;

  letter-spacing: 0.03em;

  cursor: pointer;

  opacity: 0.8;

  transition:
    color 0.2s ease,
    opacity 0.2s ease;
}

.music-control:hover {
  color: #ffffff;
  opacity: 1;
}

.music-control:focus-visible {
  outline:
    2px solid #60a5fa;

  outline-offset: 3px;

  border-radius: 4px;
}

@media (prefers-reduced-motion: reduce) {
  .btn-toggle,
  .submit-btn,
  .form-wrapper,
  .music-control {
    transition: none;
  }
}