* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'PingFang SC', '微软雅黑', sans-serif;
}

body {
  background: linear-gradient(135deg, #f0f4ff, #e8eeff);
  min-height: 100vh;
  padding: 60px 25px;
  position: relative;
  overflow-x: hidden;
}

.bg-ball {
  position: absolute;
  border-radius: 50%;
  opacity: 0.5;
  z-index: 0;
}

.b1 {
  width: 150px;
  height: 150px;
  background: #d6e0ff;
  top: -50px;
  right: -40px;
}

.b2 {
  width: 100px;
  height: 100px;
  background: #c5d4ff;
  bottom: 80px;
  left: -30px;
}

.header {
  position: relative;
  z-index: 2;
  margin-bottom: 30px;
}

.title {
  font-size: 28px;
  font-weight: 700;
  color: #2c3a77;
  margin-bottom: 10px;
}

.desc {
  font-size: 14px;
  color: #6b7cb8;
}

.tab-wrap {
  position: relative;
  display: flex;
  background: #fff;
  border-radius: 16px;
  padding: 5px;
  margin-bottom: 20px;
  box-shadow: 0 6px 20px rgba(60, 90, 200, 0.12);
}

.tab-item {
  flex: 1;
  text-align: center;
  padding: 10px 0;
  font-size: 15px;
  color: #6b7cb8;
  cursor: pointer;
  position: relative;
  z-index: 2;
  -webkit-tap-highlight-color: transparent;
}

.tab-item.active {
  color: #fff;
  font-weight: 600;
}

.tab-slide {
  position: absolute;
  top: 5px;
  left: 5px;
  width: calc(50% - 10px);
  height: calc(100% - 10px);
  background: linear-gradient(135deg, #5271ff, #3a54e0);
  border-radius: 12px;
  transition: left 0.35s ease;
  z-index: 1;
}

.login-card {
  position: relative;
  z-index: 2;
  background: #fff;
  border-radius: 24px;
  padding: 35px 25px;
  box-shadow: 0 10px 35px rgba(60, 90, 200, 0.15);
}

.input-item {
  margin-bottom: 20px;
}

.input-item input {
  width: 100%;
  height: 52px;
  padding: 0 18px;
  background: #f7f9ff;
  border: 1px solid #e4ebff;
  border-radius: 12px;
  font-size: 15px;
  outline: none;
  transition: border-color 0.3s, background 0.3s;
}

.input-item input:focus {
  border-color: #5271ff;
  background: #fff;
}

.code-row {
  display: flex;
  gap: 12px;
}

.code-row input {
  flex: 1;
}

.get-code-btn {
  width: 110px;
  height: 52px;
  background: linear-gradient(135deg, #5271ff, #3a54e0);
  color: #fff;
  border: none;
  border-radius: 12px;
  font-size: 14px;
  white-space: nowrap;
  flex-shrink: 0;
}

.get-code-btn.disabled {
  background: #b4c2f0;
  cursor: not-allowed;
}

.form-box {
  display: none;
}

.form-box.show {
  display: block;
}

.rem-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 25px;
  font-size: 14px;
  color: #6b7cb8;
}

.rem-row a {
  color: #5271ff;
  text-decoration: none;
}

.login-btn {
  width: 100%;
  height: 54px;
  background: linear-gradient(135deg, #5271ff, #3a54e0);
  color: #fff;
  border: none;
  border-radius: 12px;
  font-size: 16px;
  font-weight: 600;
  box-shadow: 0 6px 20px rgba(82, 113, 255, 0.3);
}

.login-btn:active:not(:disabled) {
  opacity: 0.95;
}

.bottom-tip {
  text-align: center;
  margin-top: 30px;
  font-size: 14px;
  color: #6b7cb8;
  position: relative;
  z-index: 2;
}

.bottom-tip a {
  color: #5271ff;
  text-decoration: none;
  font-weight: 500;
}