.form-container {
  width: 350px;
  background-color: #fff;
  box-shadow: rgba(0, 0, 0, 0.35) 0px 5px 15px;
  border-radius: 10px;
  box-sizing: border-box;
  padding: 20px 30px;
}

.title {
  text-align: center;
  font-family: "Lucida Sans", "Lucida Sans Regular", "Lucida Grande",
        "Lucida Sans Unicode", Geneva, Verdana, sans-serif;
  margin: 10px 0 20px 0;
  font-size: 28px;
  font-weight: 800;
}

.tab-buttons {
  display: flex;
  gap: 10px;
  margin-bottom: 20px;
}

.tab-btn {
  flex: 1;
  padding: 10px;
  border: 1px solid #c0c0c0;
  border-radius: 20px;
  background: #fff;
  cursor: pointer;
  font-family: "Lucida Sans", "Lucida Sans Regular", "Lucida Grande",
        "Lucida Sans Unicode", Geneva, Verdana, sans-serif;
  font-size: 12px;
  transition: all 0.3s;
}

.tab-btn:hover {
  background: #f0f0f0;
}

.tab-btn.active {
  background: teal;
  color: white;
  border-color: teal;
}

.tab-content {
  width: 100%;
  min-height: 200px;
}

.form {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 15px;
  margin-bottom: 15px;
}

.input {
  border-radius: 20px;
  border: 1px solid #c0c0c0;
  outline: 0 !important;
  box-sizing: border-box;
  padding: 12px 15px;
  width: 100%;
}

.input:focus {
  border-color: teal;
}

.input-group {
  display: flex;
  gap: 10px;
}

.input-group .input {
  flex: 1;
}

.send-code-btn {
  padding: 12px 15px;
  border-radius: 20px;
  border: 1px solid teal;
  background: #fff;
  color: teal;
  cursor: pointer;
  font-family: "Lucida Sans", "Lucida Sans Regular", "Lucida Grande",
        "Lucida Sans Unicode", Geneva, Verdana, sans-serif;
  font-size: 11px;
  white-space: nowrap;
  transition: all 0.3s;
}

.send-code-btn:hover {
  background: teal;
  color: white;
}

.page-link {
  text-decoration: underline;
  margin: 0;
  text-align: end;
  color: #747474;
  text-decoration-color: #747474;
}

.page-link-label {
  color: #747474;
  cursor: pointer;
  font-family: "Lucida Sans", "Lucida Sans Regular", "Lucida Grande",
        "Lucida Sans Unicode", Geneva, Verdana, sans-serif;
  font-size: 9px;
  font-weight: 700;
}

.page-link-label:hover {
  color: #000;
}

.form-btn {
  padding: 12px 15px;
  font-family: "Lucida Sans", "Lucida Sans Regular", "Lucida Grande",
        "Lucida Sans Unicode", Geneva, Verdana, sans-serif;
  border-radius: 20px;
  border: 0 !important;
  outline: 0 !important;
  background: teal;
  color: white;
  cursor: pointer;
  box-shadow: rgba(0, 0, 0, 0.24) 0px 3px 8px;
  transition: all 0.3s;
}

.form-btn:hover {
  background: #008080;
}

.form-btn:active {
  box-shadow: none;
}

.sign-up-label {
  margin: 0;
  font-size: 10px;
  color: #747474;
  font-family: "Lucida Sans", "Lucida Sans Regular", "Lucida Grande",
        "Lucida Sans Unicode", Geneva, Verdana, sans-serif;
}

.sign-up-link {
  margin-left: 1px;
  font-size: 11px;
  text-decoration: underline;
  text-decoration-color: teal;
  color: teal;
  cursor: pointer;
  font-weight: 800;
  font-family: "Lucida Sans", "Lucida Sans Regular", "Lucida Grande",
        "Lucida Sans Unicode", Geneva, Verdana, sans-serif;
}

.buttons-container {
  width: 100%;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  margin-top: 20px;
  gap: 15px;
}

.google-login-button,
.qq-login-button,
.github-login-button {
  border-radius: 20px;
  box-sizing: border-box;
  padding: 10px 15px;
  box-shadow: rgba(0, 0, 0, 0.16) 0px 10px 36px 0px,
        rgba(0, 0, 0, 0.06) 0px 0px 0px 1px;
  cursor: pointer;
  display: flex;
  justify-content: center;
  align-items: center;
  font-family: "Lucida Sans", "Lucida Sans Regular", "Lucida Grande",
        "Lucida Sans Unicode", Geneva, Verdana, sans-serif;
  font-size: 11px;
  gap: 5px;
  transition: all 0.3s;
}

.google-login-button:hover,
.qq-login-button:hover,
.github-login-button:hover {
  transform: translateY(-2px);
  box-shadow: rgba(0, 0, 0, 0.2) 0px 10px 36px 0px,
        rgba(0, 0, 0, 0.1) 0px 0px 0px 1px;
}

.google-login-button {
  border: 2px solid #747474;
}

.qq-login-button {
  border: 2px solid #2c2c2c;
  color: #2c2c2c;
}

.github-login-button {
  border: 2px solid #222229;
  color: #222229;
}

.google-icon,
.qq-icon,
.github-icon {
  font-size: 18px;
  margin-bottom: 1px;
}

.input-error {
  border-color: #ff4444 !important;
  animation: shake 0.3s;
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-5px); }
  75% { transform: translateX(5px); }
}