.signup-page {
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px 16px 40px;
  background: radial-gradient(ellipse at top, rgba(0, 234, 255, 0.08), transparent 55%), #060a14;
}

.signup-shell {
  width: min(980px, 100%);
}

.signup-logo-link {
  display: block;
  width: fit-content;
  margin: 0 auto 20px;
  opacity: 0.95;
}

.signup-logo-link img {
  display: block;
  width: min(220px, 60vw);
  height: auto;
  border-radius: 12px;
}

.signup-step {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.35s ease, transform 0.35s ease;
}

.signup-step-active {
  opacity: 1;
  transform: translateY(0);
}

.signup-title {
  margin: 0 0 8px;
  text-align: center;
  font-size: clamp(1.6rem, 3vw, 2.1rem);
  font-weight: 700;
  color: #f2f6ff;
}

.signup-form-title {
  margin: 0 0 16px;
  text-align: center;
  font-size: clamp(1.35rem, 2.5vw, 1.75rem);
  font-weight: 700;
  color: #f2f6ff;
}

.signup-subtitle {
  margin: 0 auto 20px;
  max-width: 640px;
  text-align: center;
  color: rgba(220, 230, 250, 0.72);
  line-height: 1.55;
  font-size: 0.95rem;
}

.signup-intent-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin-bottom: 12px;
}

.signup-intent-card,
.signup-intent-exploring {
  appearance: none;
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(255, 255, 255, 0.04);
  border-radius: 16px;
  padding: 14px 14px 12px;
  text-align: left;
  cursor: pointer;
  color: inherit;
  transition: border-color 0.2s, box-shadow 0.2s, transform 0.2s, background 0.2s;
}

.signup-intent-card:hover,
.signup-intent-exploring:hover {
  border-color: rgba(0, 234, 255, 0.35);
  background: rgba(255, 255, 255, 0.06);
}

.signup-intent-card.selected,
.signup-intent-exploring.selected {
  border-color: rgba(0, 234, 255, 0.65);
  box-shadow: 0 0 0 1px rgba(0, 234, 255, 0.2), 0 8px 24px rgba(0, 234, 255, 0.12);
  background: rgba(0, 234, 255, 0.08);
}

.signup-intent-exploring {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  margin-bottom: 18px;
}

.signup-intent-icon {
  display: block;
  font-size: 1.35rem;
  line-height: 1;
  margin-bottom: 8px;
}

.signup-intent-exploring .signup-intent-icon {
  margin-bottom: 0;
}

.signup-intent-title {
  display: block;
  font-size: 0.92rem;
  font-weight: 700;
  color: #f2f6ff;
  margin-bottom: 4px;
}

.signup-intent-desc {
  display: block;
  font-size: 0.78rem;
  line-height: 1.4;
  color: rgba(220, 230, 250, 0.62);
}

.signup-primary-btn {
  display: block;
  width: 100%;
  max-width: 360px;
  margin: 0 auto;
  padding: 14px 20px;
  border: none;
  border-radius: 12px;
  background: linear-gradient(135deg, #00eaff, #7c3aed);
  color: #fff;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
}

.signup-primary-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.signup-ghost-btn {
  border: 1px solid rgba(255, 255, 255, 0.14);
  background: transparent;
  color: rgba(220, 230, 250, 0.8);
  border-radius: 10px;
  padding: 8px 12px;
  cursor: pointer;
}

.signup-back-btn {
  display: block;
  margin: 14px auto 0;
}

.signup-login-hint {
  margin-top: 16px;
  text-align: center;
  color: rgba(220, 230, 250, 0.62);
  font-size: 0.9rem;
}

.signup-login-hint a {
  color: #00eaff;
}

.signup-selected-summary {
  margin: 0 auto 18px;
  max-width: 520px;
  padding: 10px 14px;
  border-radius: 12px;
  background: rgba(0, 234, 255, 0.06);
  border: 1px solid rgba(0, 234, 255, 0.18);
  color: rgba(220, 230, 250, 0.82);
  font-size: 0.85rem;
  text-align: center;
}

.signup-form {
  max-width: 420px;
  margin: 0 auto;
}

.signup-field {
  margin-bottom: 14px;
}

.signup-field label {
  display: block;
  margin-bottom: 6px;
  font-size: 0.85rem;
  color: rgba(220, 230, 250, 0.75);
}

.signup-field input {
  width: 100%;
  box-sizing: border-box;
  padding: 12px 14px;
  border-radius: 10px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.05);
  color: #f2f6ff;
}

.signup-password-wrap {
  display: flex;
  gap: 8px;
  align-items: center;
}

.signup-password-wrap input {
  flex: 1;
}

.signup-toggle-pw {
  flex-shrink: 0;
  border: none;
  background: rgba(255, 255, 255, 0.08);
  color: rgba(220, 230, 250, 0.8);
  border-radius: 8px;
  padding: 8px 10px;
  cursor: pointer;
  font-size: 0.8rem;
}

.signup-field-hint {
  display: block;
  margin-top: 6px;
  font-size: 0.8rem;
  color: rgba(220, 230, 250, 0.55);
}

.signup-field-hint.error {
  color: #f87171;
}

.signup-challenge-row {
  display: flex;
  gap: 8px;
  align-items: center;
}

.signup-challenge-question {
  min-width: 110px;
  font-weight: 700;
  color: #f0c674;
}

.signup-challenge-row input {
  width: 90px;
}

.signup-error {
  max-width: 420px;
  margin: 0 auto 14px;
  padding: 12px 14px;
  border-radius: 10px;
  background: rgba(239, 68, 68, 0.12);
  border: 1px solid rgba(239, 68, 68, 0.28);
  color: #fecaca;
  font-size: 0.9rem;
}

@media (max-width: 900px) {
  .signup-intent-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 520px) {
  .signup-intent-grid {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  .signup-step {
    transition: none;
  }
}