body {
  background: #181e22;
  color: #eaeaea;
  font-family: 'Segoe UI', Arial, sans-serif;
  margin: 0;
  min-height: 100vh;
}
.main-center {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
}
.form-neon {
  background: #232b35;
  border-radius: 12px;
  padding: 32px 28px 24px 28px;
  max-width: 100%;
  width:50%;
  margin: 48px auto;
  box-shadow: 0 2px 16px rgba(0,0,0,0.12);
  border: 1px solid #333b47;
}
h2 {
  text-align: center;
  margin-bottom: 22px;
  color: #90caf9;
  font-weight: 500;
}
.input-btn-wrap {
  display: flex;
  margin-bottom: 22px;
  border: 1px solid #3b4656;
  border-radius: 9px;
  overflow: hidden;
  background: #1b232c;
}
input[type="email"] {
  padding: 11px 16px;
  border: none;
  background: #181e22;
  color: #eaeaea;
  font-size: 1rem;
  outline: none;
  flex: 1;
  min-width: 0;
}
button {
  background: #42a5f5;
  color: #fff;
  border: none;
  border-radius: 0 7px 7px 0;
  font-size: 1rem;
  cursor: pointer;
  font-weight: 500;
  height: 43px;
  min-width: 115px;
  display: flex; align-items: center; justify-content: center; gap: 7px;
  transition: background 0.15s;
}
button:active { background: #1976d2; }
.otp-copy-btn, .read-mail-btn {
  background: #293241;
  color: #90caf9;
  border: 1px solid #90caf9;
  border-radius: 7px;
  font-size: .98rem;
  padding: 7px 16px;
  cursor: pointer;
  transition: background 0.13s, color 0.13s;
  display: inline-flex;
  align-items: center;
  gap: 7px;
}
.otp-copy-btn:active, .read-mail-btn:active { background: #90caf9; color: #232b35;}
.mail-list-neon {
  margin-top: 18px;
  padding: 20px 10px;
  border-radius: 12px;
  border: 1px solid #3b4656;
  background: #181e22;
  max-width: 100%;
}
.mail-item {
  background: #232b35;
  border: 1px solid #353c49;
  border-radius: 8px;
  padding: 13px 15px 10px 15px;
  margin-bottom: 13px;
  cursor: pointer;
  box-shadow: 0 1px 5px #1a233022;
  transition: background .14s;
}
.mail-item:hover { background: #2a3647; }
.mail-subject { font-weight: 500; color: #fff; }
.mail-from { color: #90caf9; }
.mail-date { color: #cccccc; font-size: .92rem;}
.mail-snippet { color: #b3c2cc; font-size: .98rem; }
.popup-bg {
  display: none;
  position: fixed; inset: 0;
  background: rgba(18,24,32, 0.82);
  z-index: 99;
  align-items: center; justify-content: center;
}
.popup-bg.show { display: flex; }
.popup-mail {
  background: #232b35;
  border-radius: 16px;
  padding: 32px 20px 24px 20px;
  color: #eaeaea;
  box-shadow: 0 8px 32px #0008;
  width: 97vw; max-width: 630px;
  max-height: 92vh; overflow-y: auto;
  position: relative;
  animation: showup .2s cubic-bezier(.17,.67,.54,1.24);
  border: 1.5px solid #333b47;
  display: flex; flex-direction: column;
}
@keyframes showup { from{ opacity:0; transform: translateY(-30px);} to{ opacity:1; } }
.close-btn {
  position: absolute; right: 18px; top: 13px; color: #90caf9;
  background: none; border: none; font-size: 1.36rem; cursor: pointer;
  z-index: 2;
}
#popupMailContent {
  background: transparent;
  color: #eaeaea;
  font-size: 1rem;
  word-break: break-word;
  padding: 0;
  min-width: 240px;
  overflow-x: auto;
}
#popupMailContent iframe {
  width: 100%; min-height: 420px; max-width: 600px;
  border: 1px solid #3b4656;
  background: #fff;
  border-radius: 7px;
}
.toast {
  position: fixed; top: 38px; left: 50%; transform: translateX(-50%);
  background: #232b35;
  color: #42a5f5;
  border-radius: 7px;
  padding: 11px 26px;
  box-shadow: 0 0 16px #42a5f555;
  font-size: 1rem;
  display: flex; align-items: center; gap: 8px;
  z-index: 9999;
  opacity: 0; pointer-events: none;
  transition: opacity .3s;
}
.toast.show { opacity: 1; pointer-events: auto;}
.spin { animation: spin 1s linear infinite; }
@keyframes spin { 100% { transform: rotate(360deg); } }
@media (max-width: 600px) {
  .popup-mail { max-width: 98vw; padding: 10vw 2vw 5vw 2vw;}
  #popupMailContent { font-size: .99rem;}
}