body {
  overscroll-behavior: none;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 40px 20px;
  background: linear-gradient(135deg, #f8faff 0%, #eef2ff 100%);
}

.join-wrap {
  width: 100%;
  max-width: 460px;
}

/*  Brand  */
.join-brand {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-bottom: 40px;
  text-decoration: none;
}
.join-brand img {
  width: 36px;
  height: 36px;
  border-radius: 8px;
}
.join-brand span {
  font-size: 1.25rem;
  font-weight: 800;
  color: #1a1a1a;
  letter-spacing: -.02em;
}

/*  Card  */
.join-card {
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 20px;
  padding: 40px 36px;
  box-shadow: 0 4px 24px rgba(0,0,0,.06);
}

.join-icon {
  width: 56px;
  height: 56px;
  background: #eff6ff;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
}
.join-icon svg {
  width: 26px;
  height: 26px;
  stroke: #2563eb;
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.join-title {
  font-size: 1.5rem;
  font-weight: 800;
  color: #1a1a1a;
  letter-spacing: -.02em;
  text-align: center;
  margin-bottom: 8px;
}
.join-sub {
  font-size: .875rem;
  color: #6b7280;
  text-align: center;
  line-height: 1.6;
  margin-bottom: 32px;
}

/*  Input  */
.field-label {
  display: block;
  font-size: .8125rem;
  font-weight: 600;
  color: #374151;
  margin-bottom: 7px;
}
.field-input {
  width: 100%;
  padding: 12px 14px;
  border: 1.5px solid #d1d5db;
  border-radius: 10px;
  font-size: .9375rem;
  color: #1a1a1a;
  background: #fff;
  outline: none;
  transition: border-color .2s, box-shadow .2s;
  box-sizing: border-box;
  font-family: 'ui-monospace', 'SFMono-Regular', monospace;
  letter-spacing: .02em;
}
.field-input:focus {
  border-color: #2563eb;
  box-shadow: 0 0 0 3px rgba(37,99,235,.1);
}
.field-input::placeholder {
  color: #9ca3af;
  letter-spacing: normal;
  font-family: inherit;
}
.field-hint {
  font-size: .75rem;
  color: #9ca3af;
  margin-top: 6px;
}

/*  Button  */
.join-btn {
  width: 100%;
  margin-top: 24px;
  padding: 13px 20px;
  background: #1a1a1a;
  color: #fff;
  border: none;
  border-radius: 10px;
  font-size: .9375rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: background .2s, transform .15s;
}
.join-btn:hover    { background: #2e2e2e; transform: translateY(-1px); }
.join-btn:disabled { opacity: .6; cursor: not-allowed; transform: none; }
.join-btn svg {
  width: 16px;
  height: 16px;
  stroke: currentColor;
  fill: none;
  stroke-width: 2.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/*  Error  */
.join-error {
  display: none;
  background: #fef2f2;
  border: 1px solid #fecaca;
  border-radius: 8px;
  padding: 10px 14px;
  font-size: .8125rem;
  color: #dc2626;
  margin-top: 16px;
  text-align: center;
}

/*  Divider  */
.join-divider {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 28px 0;
}
.join-divider::before,
.join-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: #e5e7eb;
}
.join-divider span {
  font-size: .75rem;
  color: #9ca3af;
  font-weight: 500;
}

/*  Login link  */
.join-login-link {
  text-align: center;
  font-size: .875rem;
  color: #6b7280;
}
.join-login-link a {
  color: #2563eb;
  font-weight: 600;
  text-decoration: none;
}
.join-login-link a:hover { text-decoration: underline; }

/*  Footer  */
.join-footer {
  text-align: center;
  margin-top: 28px;
  font-size: .75rem;
  color: #9ca3af;
}
.join-footer a         { color: #9ca3af; text-decoration: none; }
.join-footer a:hover   { color: #6b7280; }

/*  Spinner  */
.btn-spinner {
  width: 15px;
  height: 15px;
  border: 2px solid rgba(255,255,255,.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin .7s linear infinite;
  display: inline-block;
  flex-shrink: 0;
}
@keyframes spin { to { transform: rotate(360deg); } }

/*  Responsive  */
@media (max-width: 480px) {
  .join-card { padding: 28px 20px; }
}